WO2015199084A1 - Multi-feeder and method for operating same - Google Patents

Abstract

　This multi-feeder is configured such that the bottom surface of a hopper is closed off by a horizontal bottom plate, a plurality of small round openings are provided around a common central axis in the bottom plate, a small feeder is connected to the bottom side of each small round opening, and material supplied into the hopper can be discharged downward by the small feeders; and is configured such that a central rotating scraping vane having a plurality of spokes is provided above the bottom plate, and the central rotating scraping vane is caused to rotate, whereby material remaining on the bottom plate is transferred in the rotation direction through the small round openings and allowed to be discharged to the small feeders.

Description

Multi-feeder and operation method thereof

The present invention relates to a multi-feeder for smoothly discharging and supplying a material in a large silo, for example, and an operation method thereof.

Conventionally, in a large silo, when dehydrated sludge in a silo or powder material is quantitatively supplied from the lower part of the silo, an inverted conical shape is formed at the lower end of the cylindrical body constituting the silo in order to reduce residual material. In addition to providing a hopper, a large central fixed cone cone is provided from an intermediate portion of the inner peripheral surface of the hopper toward the common central axis of the hopper, and further at an annular boundary portion between the inner peripheral side surface of the hopper and the large central fixed cone cone. A structure in which a plurality of circular holes are provided, a rotary feeder is connected to the lower side of each of the circular holes, and the granular material in the silo is discharged from each discharge port of each of the plurality of rotary feeders. Has been proposed (Patent Documents 1 and 2).

JP 2002-209433 A Japanese Utility Model Publication No. 5-80600

By the way, the conventional silo feeder has a complicated shape around the circular hole at the bottom of the hopper even after the powder material in the hopper is discharged by the rotary feeder through each circular hole. In some cases, the granular material may remain between the side surface and the side surface of the large central fixed cone cone, and it has been a problem to minimize the residual granular material in the silo.

Moreover, since the conventional feeder has a large central fixed cone cone in the hopper, it is difficult to increase the storage volume of the silo.

The present invention has been made in view of the above-described conventional problems. For example, it is possible to stably supply and discharge the granular material in the silo by a small feeder provided in the lower part of a hopper such as a large silo. In addition, an object of the present invention is to provide a multi-feeder and an operation method thereof that can reduce the residual of the granular material in the silo as much as possible.

Also, an object of the present invention is to provide a multi-feeder that can increase the storage volume of a silo without requiring a large fixed conical cone as in the prior art.

Also, an object of the present invention is to realize a multi-feeder with less residual material by using a small-sized feeder with a smaller number of bases than in the past.

In order to achieve the above object, the present invention
As a first feature, a hopper sharing a common central axis with the storage tank is provided at a lower part of the storage tank, and the lower surface of the hopper is closed with a horizontal bottom plate, and a plurality of the bottom plates around the common central axis are provided. The small circular openings, the small feeders are connected to the lower sides of the small circular openings, and the material supplied into the hopper can be discharged downward by the plurality of small feeders. The rotary drive shaft centering on the common central axis is provided on the bottom plate, and forward / reverse drive means for the rotary drive shaft is provided, and the rotary drive shaft is radially centered on the common central axis. A central rotary scraping blade having a plurality of spokes is fixed, and each spoke is disposed so as to be close to the upper surface of the bottom plate, and the central upper surface of the central rotary scraping blade has a conical shape centered on the common central axis. cap It is configured to rotate the central rotary scraping blade so that the material remaining on the bottom plate can be transferred in the rotational direction and discharged into the small feeders through the small circular openings. It is composed of a multi-feeder that is characterized.

Material is, for example, a granular material. The said hopper can be comprised by a hopper part (3) and a short tube (4). The small feeder can be constituted by, for example, rotating feeders (14a to 14c). The forward / reverse drive means can be constituted by, for example, an electric motor (M). If comprised in this way, after discharging the material in a storage tank and a hopper below by driving a plurality of small feeders, when the above-mentioned rotation drive shaft is driven by an electric motor and the central rotary scraping blade is rotated, The material remaining on the bottom plate can be transferred in the rotation direction by the spokes of the central rotary scraping blade, and can be discharged into a small feeder from a small circular opening provided in the bottom plate. Since the bottom plate of the hopper is horizontal and the material remains on the horizontal bottom plate, these residual materials are smoothly transferred by the rotation of each spoke provided close to the top surface of the bottom plate, and a plurality of materials are transferred. It can be discharged into a small circular opening. Residual material discharged into the plurality of small circular openings can be discharged downward by a corresponding plurality of small feeders.

As a second feature, in the multi-feeder according to the present invention, the central rotary scraping blade and the conical cap are separated, and the conical cap is disposed between the inner peripheral surface of the hopper and the conical cap. The small circular opening is fixedly installed at the position centered on the common central axis by a plurality of support arms radially provided at a position where the small circular opening is not blocked, and the central rotary scraping blade, the conical cap, A gap is provided between them, and the central rotary scraping blade is configured to be rotatable in the fixed state of the conical cap.

With this configuration, since the thrust load of the material applied to the conical cap does not directly act on the central rotary scraping blade, even if the material is heavy, the thrust load resistance of the motor that drives the rotary drive shaft can be reduced. It is possible to smoothly rotate the central rotary scraping blade without exceeding.

As a third feature, the multi-feeder according to the present invention is provided with a position detection sensor for detecting the position of the spoke of the central rotary scraping blade on the bottom board, and based on a signal from the position detection sensor, In the stopped state of the central rotary scraping blade, the position of each spoke is configured to stop at a position where the openings of the plurality of small circular openings are not blocked.

The position detection sensor can be configured by, for example, a proximity sensor (13), and can be configured to detect the position of the protrusion (11c or 12f) of the corresponding central rotary scraping blade as the detected portion. it can. With this configuration, each position of the spokes of the central rotary scraping blade can be detected by the position detection sensor at a position where the spoke does not block the opening of the small circular opening, and the position detection sensor When the position is detected, for example, the control unit (28) detects the signal from the position detection sensor and stops the rotation of the central rotary scraping blade, whereby each spoke has the small circular opening. The central rotary scraping blade can be always stopped at a position where the opening of the part is not blocked. Since the central rotary scraping blade is stopped during the operation of the small feeder, this configuration allows the central rotary scraper blade to perform the material discharging operation during the material discharging operation by a plurality of small feeders. There is no impact.

As a fourth feature, the multi-feeder according to the present invention is provided with a position detection sensor for detecting the position of the spoke of the central rotary scraping blade on the bottom plate, and based on a signal from the position detection sensor, The stop position of the central rotary scraping blade is such that the position of each spoke does not block the openings of the plurality of small circular openings, and is the central stop position below each support arm. Composed.

With this configuration, since the load of the material does not directly act on each spoke of the central rotary scraping blade, even if the material is heavy, it does not exceed the thrust load resistance of the motor, and the central rotary scraping blade can be smoothly Can be rotated.

As a fifth feature, the multi-feeder according to the present invention detects that the upper end level of the material transferred from the small circular openings into the small feeders has become a predetermined level lower than the position of the bottom plate. A level sensor to be obtained is provided for each of the small feeders, and based on the detection that the upper end level of the material has reached the predetermined level in all the level sensors, the central rotary scraping blade in the stopped state is provided. Configured to begin rotation.

With this configuration, when the level sensor detects that the upper end level of the material transferred into each small feeder has become lower than the position of the bottom plate as the material discharge in the hopper progresses, Since the material remains in the state, the signal from the level sensor is detected by, for example, the control unit (28), and the rotation of the central rotating scraping blade in the stopped state is started. The material can be efficiently transferred and discharged into the small circular opening.

As a sixth feature, the multi-feeder according to the present invention detects that the upper end level of the material transferred from the small circular openings into the small feeders has become a predetermined level lower than the position of the bottom plate. A level sensor to be obtained is provided for each of the small feeders, and based on the detection that the upper end level of the material has reached the predetermined level in any one of the level sensors, Within a predetermined range, the forward / reverse driving means performs forward / reverse swinging / rotating operation of the central rotary scraping blade.

The predetermined range may be, for example, a range in which the spoke does not protrude from the width of the support arm or a range that slightly protrudes. With this configuration, when the discharge of the material progresses and the material in any one of the small feeders becomes a predetermined level or less, by performing the forward / reverse swing rotation operation of the central rotary scraping blade, At an early stage, the material bridge in the hopper can be broken and the subsequent material discharge operation can be performed smoothly.

As a seventh feature, the multi-feeder according to the present invention is provided with a detected portion capable of detecting the central stop position for each of the spokes by a position detection sensor in the central rotary scraping blade corresponding to each spoke. A position detection sensor capable of detecting the arrival of the spokes at the central stop position is provided on the bottom plate, and based on detection that the upper end level of the material in all the level sensors has reached the predetermined level, Stop the forward / reverse oscillating rotation operation and perform intermittent rotation operation in which each spoke of the central rotation scraping blade rotates by a certain angle in the forward direction to the central stop position below the adjacent support arm. Configured to do.

The detected part can be constituted by a protruding part (12f), for example. For example, if the number of small circular openings is three, the certain angle is 120 degrees. When configured in this way, after discharging the material in the storage tank and the hopper downward, it performs an intermittent rotation operation until each spoke of the central rotary scraping blade is located below the adjacent support arm. The rotation range of the central rotary scraping blade can be reduced as much as possible to save labor, and the material remaining on the bottom can be effectively discharged into the small feeder.

As an eighth feature, in the multi-feeder according to the present invention, the tip of each spoke of the central rotary scraping blade extends to a position close to the inner surface of the hopper, and each spoke has the central rotary scraping blade. Is configured to be able to cross substantially the entire opening of each small circular opening.

The inner surface of the hopper can be the inner surface (4c) of the short tube (4) when, for example, the short tube (4) is connected to the lower side of the hopper (3). If comprised in this way, the material scraped by each spoke of the center rotation scraping blade | wing can be efficiently discharged | emitted in a small circular opening part.

As a ninth feature, in the multi-feeder according to the present invention, a single conveyor is provided below the plurality of small feeders, and the discharge chute of each discharge chute of each of the small feeders is located above the single conveyor. By being positioned at the position, the material discharged from a plurality of small feeders can be conveyed by the single conveyor.

With this configuration, the discharged material from a plurality of small feeders can be received and conveyed by a single conveyor, and efficient material unloading can be performed.

As a tenth feature, in the multi-feeder according to the present invention, the support arm has a triangular shape in cross section, a ridge extending in the radial direction is formed at each upper end, and a central joint portion of each support arm at the center of the hopper. And the lower end of the conical cap is fixed on the protrusions of the support arms at the central joint.

With this configuration, since a gentle ridge line is not formed at the joint between the conical cap and the support arm, it is possible to suppress the occurrence of material bridging at the connection between the conical cap and the support arm.

As an eleventh feature, in the multi-feeder according to the present invention, each of the support arms fixes a vertical plate to a tip portion adjacent to the inner surface of the hopper, and each vertical plate and the inner surface of the hopper are connected to each other. The connection is fixed.

If comprised in this way, since a gentle ridgeline is not formed in the connection part of a support arm and the inner peripheral surface of a hopper, generation | occurrence | production of the bridge | bridging of a material can be suppressed in the connection part of a support arm and a hopper inner peripheral surface. .

As a twelfth feature, in the multi-feeder according to the present invention, an annular extension plate protruding toward the common central axis is provided on an inner peripheral surface in the vicinity of the bottom plate at the lower end of the hopper, and the lower side of the annular extension plate An annular space communicating with the inside of the hopper is formed, and the tip of each spoke of the central rotary scraping blade is configured to be located in the annular space.

With this configuration, the material sent in the outer circumferential direction by the spokes of the central rotary scraping blade is conveyed into the annular space and is smoothly conveyed by the tip of each spoke in the annular space. Since it can be discharged into the part, the resistance acting on each spoke due to the accumulation of material in the vicinity of the outer peripheral part of the bottom board can be reduced, and the material at the outer peripheral part of the bottom board can be discharged smoothly.

As a thirteenth feature, in the multi-feeder according to the present invention, the number of the small circular openings and the corresponding small feeders is any one of three to six, and the small circular The opening is formed on the bottom plate with a uniform opening angle around the common central axis.

As described above, since the present invention can reliably discharge the residual material by the rotation of the central rotary scraping blade, for example, in a large silo or the like, a relatively small number of 3 to 6 small feeders can be used. It is possible to perform a discharging operation with as little residual material as possible.

As a fourteenth feature, in the multi-feeder according to the present invention, the small feeder is a rotary feeder.

With this configuration, for example, the powder material can be discharged quantitatively by a plurality of rotating feeders.

As a fifteenth feature, a multi-feeder operation method according to the present invention is a multi-feeder operation method having the first feature or the second feature described above, and is provided in each small feeder from each small circular opening. A level sensor that can detect that the upper end level of the material that has shifted to a predetermined level lower than the position of the bottom plate is provided for each of the small feeders, and during the discharging operation by the small feeders, The central rotary scraping blade is stopped, and the rotation of the central rotary scraping blade in the stopped state is started based on the detection that the upper end level of the material has reached the predetermined level in all the level sensors. It is comprised by the operation method of the characteristic multi-feeder.

With this configuration, in a state where the level sensor detects that the top level of the material transferred into each small feeder has become lower than the position of the bottom plate as the material discharge in the hopper progresses, Since the material remains on the upper surface, the signal from the level sensor is detected by, for example, the control unit (28), and the rotation of the central rotating scraping blade in the stopped state is started. The remaining material can be efficiently transferred and discharged into the small circular opening.

As a sixteenth feature, the operation method of the multi-feeder according to the present invention further includes a position detection sensor for detecting the position of the spoke of the central rotary scraping blade on the bottom plate, and a signal from the position detection sensor. Based on the above, the central rotary scraping blade is stopped so that the spokes do not block the openings of the plurality of small circular openings.

With this configuration, the central rotary scraping blade can always be stopped at a position where each spoke does not block the opening of the small circular opening. Since the central rotary scraping blade is stopped during the operation of the small feeder, this configuration allows the central rotary scraper blade to perform the material discharging operation during the material discharging operation by a plurality of small feeders. There is no impact.

As a seventeenth feature, the multifeeder operation method according to the present invention is a multifeeder operation method according to the fourth feature, wherein the material transferred from the small circular openings to the small feeders is provided. A level sensor capable of detecting that the upper end level has become a predetermined level lower than the position of the bottom board is provided for each of the small feeders, and during the discharging operation by the small feeders, the central rotary scraping blade is Based on the detection that the upper end level of the material has reached the predetermined level in any one of the level sensors, the forward / reverse driving means is set within a predetermined range below the support arm. Thus, the forward and reverse swinging movement of the central rotary scraping blade is performed.

With this configuration, when the material discharge progresses and the material in any one of the small feeders reaches a predetermined level, it is relatively fast by performing the forward / reverse swing rotation operation of the central rotary scraping blade. At the stage, the bridge of the material in the hopper can be broken and the subsequent material discharging operation can be performed smoothly.

As an eighteenth feature, in the multi-feeder operating method according to the present invention, a detected portion capable of detecting the central stop position for each spoke by a position detection sensor is further provided for each spoke. Correspondingly provided, a position detection sensor capable of detecting the arrival of each spoke at the central stop position is provided on the bottom plate, and during the discharging operation by the small feeder, the central rotary scraping blade is stopped, Based on the detection that the upper end level of the material has reached the predetermined level in the level sensor, the forward / reverse swing rotation is performed until the material of any one of the small feeders exceeds the predetermined level. Stopping the operation, the spokes of the central rotary scraping blades rotate by a certain angle in the forward direction to the central stop position below the adjacent support arm. Repeated intermittent rotation operation that stops at the position.

The detected part can be constituted by, for example, a detected part (12f) provided on the central disk (12d) corresponding to the spoke (see FIG. 14A). With this configuration, after the material in the storage tank and the hopper is discharged downward, the central rotary scraping blade is intermittently rotated to the lower side of the adjacent support arm. It is possible to save labor by reducing the moving range as much as possible, and to effectively discharge the material remaining on the bottom board into the small feeder.

According to the present invention, after the material in the storage tank and the hopper is discharged downward, the material remaining on the bottom plate of the hopper can be discharged smoothly by rotating the central rotary scraping blade. In the silo, it is possible to perform an appropriate discharging operation with as little residual material as possible with a relatively simple configuration without forming a storage tank having a complicated structure.

Also, since there is no large fixed cone cone in the center of the bottom plate as in the conventional case, the storage volume can be further expanded.

In addition, since the central rotary scraping blade can be stopped at a position where each spoke does not block the opening of the small circular opening, the central rotary scraping on the bottom plate is performed during the quantitative discharge operation of the materials by a plurality of small feeders. The blades do not affect the discharge operation of the material.

In addition, since the level sensor detects that the material has remained on the upper surface of the bottom plate and the rotation of the central rotating scraping blade in the stopped state can be started, the remaining material is efficiently removed. Since the central rotary scraping blade is stopped during normal discharge, power consumption can be suppressed.

Also, since each spoke traverses substantially the entire opening of the small circular opening, the material scraped by each spoke of the central rotary scraping blade can be efficiently discharged into the small circular opening.

Also, the discharged materials from a plurality of small feeders can be received and transported by a single conveyor, so that the material can be efficiently carried out.

In addition, even when applied to a large-diameter silo, for example, a small number (three to six) of small feeders can realize a discharge operation with little residual.

Further, according to the operation method of the multi-feeder of the present invention, when the level rotary sensor detects that the central rotary scraping blade is stopped during the normal discharging operation and the material remains on the bottom board. In addition, since the rotation of the central rotary scraping blade can be started, the residual material can be discharged efficiently and the power consumption can be suppressed.

Also, since each spoke of the central rotary scraping blade is stopped below the support arm, the material load does not act directly on the spoke, so even a heavy material exceeds the thrust load capacity of the motor And the center rotary scraping blade can be smoothly rotated.

In addition, since a gentle ridge line is not formed at the joint between the conical cap and the support arm, it is possible to suppress the occurrence of material bridging at the connection between the conical cap and the support arm.

In addition, since a gentle ridge line is not formed at the connection portion between the support arm and the inner peripheral surface of the hopper, the occurrence of material bridging can be suppressed at the connection portion between the support arm and the inner peripheral surface of the hopper.

In addition, an annular extension plate is provided on the inner peripheral surface of the hopper, and the material sent in the outer peripheral direction on the bottom plate is guided into the annular space, thereby preventing the material from being deposited near the outer peripheral portion of the bottom plate and depositing on each spoke. The resistance due to the material can be reduced, and the material on the outer periphery of the bottom can be discharged smoothly.

Further, when the material discharge progresses and the material in any one of the small feeders becomes a predetermined level or less, the hopper can be moved at a relatively early stage by performing the forward / reverse swing rotation operation of the central rotary scraping blade. The bridge | bridging of the inside material can be broken and subsequent discharge operation | movement of material can be performed smoothly.

In addition, after discharging the material in the storage tank and the hopper downward, the center rotary scraping blade is intermittently rotated to the lower side of the adjacent support arm. It is possible to save labor by reducing the amount of material and to effectively discharge the material remaining on the bottom board into the small feeder.

It is a side view of the principal part of the multi feeder concerning the present invention. It is a top view of a multi-feeder same as the above. FIG. 3 is a sectional view taken along line XX in FIG. 2. FIG. 4 is an enlarged view of the vicinity of the rotary feeder of FIG. 3. It is a top view of the rotation feeder vicinity of a multi-feeder same as the above. It is a top view of the hopper of a multi-feeder same as the above which shows an example of the material which remained in the multi-feeder. FIG. 6B is a schematic side sectional view of FIG. 6A. It is a block diagram which shows the electric constitution of a multi-feeder same as the above. It is a flowchart which shows the operation | movement procedure of the control part of a multi-feeder same as the above. It is a functional block diagram for implement | achieving the operation | movement procedure of the control part of a multi-feeder same as the above. It is a top view of the bottom board of the hopper of a multi-feeder same as the above at the time of providing four rotation feeders. It is a top view of the bottom board of the hopper of a multi-feeder same as the above at the time of providing five rotation feeders. It is a top view of the bottom board of the hopper of a multi-feeder same as the above at the time of providing six rotation feeders. It is side surface sectional drawing of 2nd Embodiment of a multi-feeder same as the above. It is a top view of the multi feeder of a 2nd embodiment same as the above. It is a side view of the principal part of the multi-feeder of 2nd Embodiment same as the above. It is side surface sectional drawing of 3rd Embodiment of a multi-feeder same as the above. It is a top view of the multi-feeder of 3rd Embodiment same as the above. It is a side view of the principal part of the multi-feeder of 3rd Embodiment same as the above. It is a top view of the conical cap vicinity of the multi feeder of 3rd Embodiment same as the above. It is a side view of the conical cap vicinity of a multi-feeder same as the above. It is side surface sectional drawing of the conical cap vicinity of a multi-feeder same as the above. It is a flowchart which shows the operation | movement procedure of the control part of 3rd Embodiment of a multi-feeder same as the above.

Hereinafter, the multi-feeder according to the present invention will be described in detail.

1 is a side view of the multi-feeder, FIG. 2 is a plan view of the multi-feeder, and FIG. 3 is a cross-sectional side view of the multi-feeder (cross-sectional view taken along line XX in FIG. 2).

In these drawings, reference numeral 1 denotes a cylindrical silo, which is connected to a cylindrical upper storage tank (storage tank) 2 having a common central axis C as a central axis, and a lower part of the upper storage tank 2, and the common center It is composed of a reverse frustoconical hopper 3 that shares the axis C and serves as a central axis, and the silo 1 is vertically fixed on the ground G by a cylindrical machine frame 40 ( (See FIG. 3).

The diameter of the storage tank 2 is, for example, 12 m, and the diameter of the opening 3 a below the hopper 3 is, for example, 6 m. The multi-feeder according to the present invention is thus applied to a large-diameter silo in which the diameter of the opening 3a is 4 m or more (reservoir diameter is 7 to 20 m, for example).

The lower end of the hopper 3 is opened downward by an opening 3a, and a flange 3b is formed on the periphery of the opening 3a.

The opening 3a of the hopper 3 has a cylindrical short tube 4 (vertical width T) having an upper and lower opening having the same diameter as that of the opening 3a with the common central axis C as a central axis. A flange 4a is connected to the flange 3b by connecting the flange 4a to the lower flange 4b of the short pipe 4 with a horizontal circular bottom 5 centered on the common central axis C and having an outer peripheral connection portion 5b. Connected. The hopper 3 and the short pipe 4 are collectively referred to as “hopper 3 ′”.

The bottom plate 5 has, on its flat upper surface 5a, centered on the common central axis C, on each radial line N divided into three equal parts every 120 degrees in the circumferential direction, and each center (central axis) Ca, Cb, Three small circular openings 6a, 6b, 6c in which Cc is located are formed through. Note that the small circular openings 6a to 6c (a plurality of small circular openings are collectively indicated by reference numeral “6”) are not limited to three in the present embodiment, and the diameter of the opening 3a of the hopper 3 is supplied. Depending on the material or the like, any of 4, 5, or 6 may be used as shown in FIGS. 10A to 10C. These small circular openings 6 are formed through the bottom board 5 with a uniform opening angle around the common central axis C. Rotating feeders (small feeders) 14a to 14c, which will be described later, are connected to the back side of these small circular openings 6 through short cylinders.

These small circular openings 6a, 6b, 6c are formed at positions where the outer circumferences of the circles are in contact with the inner circumferential surface 4c of the short pipe 4 (hopper 3 ′) in plan view (see FIG. 2). The centers (central axes) Ca, Cb, Cc of the small circular openings 6a, 6b, 6c are located on the circumference H at a distance t1 in the radial direction from the common central axis C (FIG. 2, short). Assuming that the radius of the tube 4 is t4, t1 <t4), all of which are composed of circles having the same radius t2. Therefore, the lower part of the hopper 3 ', that is, the lower part of the short tube 4 is opened only by the small circular openings 6a, 6b, 6c, and the other horizontal parts are closed by the flat upper surface 5a of the bottom board 5. It has become a state.

The small circular openings 6a, 6b, and 6c are integrated with the back surface 5c of the bottom plate 5, and are short cylinders 7a, 7b, and 7b, which have the same radius as the radius t2 of the small circular openings 6a, 6b, and 6c. 7c extends vertically downward, and flanges 7a ', 7b', 7c 'are formed at the lower ends of the short cylinders 7a, 7b, 7c, respectively.

An electric motor M is fixed to the center of the bottom panel 5 on the back surface 5c side, and a rotary drive shaft 10 having the common central axis C as a central axis is connected to an output shaft 8 of the electric motor M via a speed reducer 9. The rotary drive shaft 10 is connected and formed so as to protrude on the upper surface 5a side of the bottom plate 5.

A central rotary scraping blade 12 ′ integrated with a conical cap 11 centering on the common central axis C is mounted and fixed on the rotary drive shaft 10 protruding from the upper surface 5 a of the bottom plate 5. More specifically, the rotary drive shaft 10 is fitted and connected to a boss portion 11 b formed at the center of the bottom plate 11 a of the conical cap 11. As shown in FIG. 2, three spokes (scraping blades) 12, 12, 12 are formed on the outer peripheral side surface of the conical cap 11 so as to protrude in the horizontal direction. Here, the spokes 12, 12, and 12 are collectively referred to as a central rotary scraping blade 12 '. Thus, the conical cap 11 centering on the common central axis C is integrally provided on the central upper surface of the central rotary scraping blade 12 ′, and the central rotary scraping blade 12 ′ is rotated together with the conical cap 11. Configure to get. Therefore, a central rotary scraping blade 12 ′ having a plurality of spokes 12 extending radially about the common central axis C is fixed to the rotary drive shaft 10, and each spoke 12 is close to the upper surface 5 a of the bottom plate 5. The conical cap 11 centering on the common central axis C is provided on the central upper surface of the central rotary scraping blade 12 '.

These spokes 12, 12, 12 are formed horizontally in the radial direction with an opening angle of 120 degrees in the circumferential direction around the common central axis C, and the spokes 12, 12, 12, A narrow clearance t3 (for example, 10 mm to 50 mm) is formed between the upper surface of the bottom plate 5 and the spokes 12, 12, 12 are positioned close to the upper surface 5a of the bottom plate 5. (See FIG. 4). The tips of the spokes 12, 12, 12 extend to a position close to the inner peripheral surface 4c of the short pipe 4 (hopper 3 ′) (radius t4> t1). Bent portions 12a, 12a, and 12a that are bent in the rotation direction (the direction of arrow A) are formed.

Accordingly, when the electric motor M is driven, the conical cap 11 and the spokes 12, 12, and 12 can both rotate in the direction of arrow A based on the rotation of the rotary drive shaft 10 in the direction of arrow A. ing. The spokes 12, 12, 12 have their respective tip portions 12 a close to the inner peripheral surface 4 c of the short cylinder 4, so that the spokes 12, 12, 12 are rotated when the spokes 12, 12, 12 are rotated. Can be worn almost entirely on the upper surface 5a, and the lower surfaces of the spokes 12, 12, 12 pass so as to cross the entire upper surface of the openings of the small circular openings 6a, 6b, 6c. Therefore, the granular material remaining on the upper surface 5a is wiped out and can be dropped and supplied into the small circular openings 6a, 6b, 6c.

Reference numeral 13 denotes a proximity sensor provided at a position corresponding to the bottom plate 11a of the conical cap 11 in the bottom plate 5, and can detect the arrival of a detection projection 11c provided downward on the bottom plate 11a. It is configured as follows. As shown in FIG. 2, the spokes (scraping blades) 12, 12, and 12 each of the spokes 12 of the central rotary scraping blade 12 'are disposed when the protruding portion 11c arrives at a position directly above the proximity sensor 13. , 12 and 12 are positions on the upper surface 5a outside the range of the openings of the small circular openings 6a, 6b and 6c, specifically, between the small circular openings 6a and 6b, between 6b and 6c, 6c. , 6a is located at an intermediate position (position shown in FIG. 2). The normal feeding operation is performed by the rotary blades 20 of the rotary feeders (small feeders) 14a, 14b, and 14c, which will be described later, in a state where the central rotary scraping blade 12 'is stopped. Therefore, the spokes 12, 12, At the 12 stop positions, the small circular openings 6a, 6b, 6c are not blocked by the spokes 12, 12, 12. The plurality of rotary feeders 14a to 14c are collectively indicated by reference numeral “14”. For example, a magnetic proximity switch can be used as the proximity sensor 13.

The protrusion 11c is located on the circumference of the constant radius from the central axis C in the bottom plate 11a, and the proximity sensor 13 is also located on the same circumference of the constant radius from the central axis C in the bottom plate 5. The projecting portion 11c can arrive directly above the proximity sensor 13 by rotating the central rotary scraping blade 12 'and the conical cap 11.

The output signal of the proximity sensor 13 is sent to a control unit 28 (see FIG. 7), which will be described later. When the control unit 28 stops the central rotary scraping blade 12 ′, the protruding portion 11c is moved to the proximity sensor. 13 is detected, and when the protrusion 11c arrives (positions) immediately above the proximity sensor 13, the driving of the motor M is stopped and the spokes 12, 12, 12 It is comprised so that rotation of may stop.

That is, when the rotation of the spokes 12, 12, and 12 is stopped, the proximity sensor 13 monitors the arrival of the protruding portion 11c in the control unit 28, and based on the output signal of the proximity sensor 13 When it is detected that the protruding portion 11c has reached the position just above the sensor 13, the driving of the electric motor M is controlled so that the stop positions of the spokes 12, 12, and 12 are always shown in FIG. That is, the spokes 12, 12, and 12 are configured to be positions outside the range of the small circular openings 6a, 6b, and 6c.

FIG. 6 shows a state in which the powder material in each of the rotary feeders 14a, 14b, 14c is substantially discharged (powder particles are discharged more than the detection level position of level sensors 27a, 27b, 27c described later). The level of the body material is lowered, and the granular material remaining on the bottom plate 5 in the state where the granular material in each short cylinder 7a, 7b, 7c is substantially discharged by the respective rotary feeders 14a, 14b, 14c) An example of the material P is shown. As shown in FIG. 6, the spokes 12, 12, 12 rotate in the direction of arrow A in the situation where the granular material P remains on the bottom plate 5, so that the residual material existing on the bottom plate 5 is present. The granular material P is scraped out and the residual granular material P is discharged into the small circular openings 6a, 6b, 6c.

Rotating feeders 14a, 14b and 14c are connected to the flanges 7a ', 7b' and 7c 'of the short cylinders 7a, 7b and 7c, respectively. Since the basic configuration of the rotary feeders 14a to 14c is the same, the rotary feeder 14b shown in FIG. 3 and FIG. 4 will be described in detail, and the other parts of the rotary feeders 14a and 14c have the same reference numerals (or The same reference numerals are denoted by “a” and “c”, and the description thereof is omitted.

The rotary feeder 14b is centered on the central axis Cb via a gap t5 below the lower end of the inner cylinder 15 centered on the central axis Cb, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-256026. A bottom plate 16 is disposed, and an outer tube 17 sharing the central axis Cb with the inner tube 15 is provided along the outer periphery of the bottom plate 16, and an upper end thereof and an outer peripheral surface of the inner tube 15 are closed with an annular connecting plate 18. The annular passage R of the granular material is formed between the inner and outer cylinders 15 and 17, and four rotary blades (spokes) 20 are provided on the rotary drive shaft 19 protruding from the center of the bottom plate 16. A rotating ring 21 that rotates along the inner peripheral surface of the outer cylinder 17 is provided at the outer end, and a plurality of scratching claws 22 that are directed inward are provided on the rotating ring 21 (see FIG. 5). The granular material that has flowed into the passage R The passage R is moved above 掻爪 22, it is intended to quantitatively discharge the powdered or granular material from the outlet 23b in the annular passage R.

The rotational drive shaft 19 can be rotationally driven in the direction of arrow A via the speed reducer 25 by the rotation of the electric motor Mb. The rotary feeder 14b (14a, 14c) is not limited to this type, and may be a rotary feeder having another structure.

A discharge chute 24b is connected to the discharge port 23b by a flange 24b '. As shown in FIG. 1, the discharge chute 24 b is inclined in the direction of the common center axis C, and immediately below the common center line C, along the diameter L of the cylinder of the upper storage tank 2, the storage tank 2. The granular material can be dropped and supplied onto a conveyor belt 26a of a single conveyor 26 provided so as to cross the wall.

In the rotary feeder configured as described above, the rotary feeders 14a, 14b, and 14c having the same configuration are connected and fixed to the lower portions of the short cylinders 7a, 7b, and 7c (see FIG. 2). Further, as shown in FIG. 2, the positions of the discharge ports 23a, 23b, and 23c of the rotary feeders 14a, 14b, and 14c are the discharge ports 23a of the rotary feeder 14a that are located above the conveyor belt 26a of the conveyor 26, as shown in FIG. It is located above the conveyor belt 26a, and a discharge chute 24a is provided vertically downward from the discharge port 23a (see FIG. 1).

The discharge ports 23b and 23c of the rotary feeders 14b and 14c located on the left and right of the conveyor 26 are respectively provided on the upper sides of the conveyor belt 26a on the left and right sides of the conveyor 26, and are connected to the discharge port 23b. The chute 24b is provided so as to be inclined rightward from the discharge port 23b toward the center of the conveyor belt 26a so that the lower end opening is located above the conveyor belt 26a.

Further, the discharge chute 24c connected to the discharge port 23c is provided to be inclined to the left from the discharge port 23c toward the center of the conveyor belt 26a so that the lower end opening is located above the conveyor belt 26a. Yes.

Thereby, the granular material discharged from each of the rotary feeders 14a to 14c is configured to be dropped and supplied together on one (single) conveyor 26.

27a, 27b, and 27c are level sensors provided on the side surfaces of the short cylinders 7a, 7b, and 7c corresponding to the rotary feeders 14a, 14b, and 14c, and are inserted into the short cylinders 7a, 7b, and 7c. It is detected that the level of the produced granular material is lowered.

In these level sensors 27a to 27c, the level of the granular material in the short cylinders 7a, 7b, 7c of the rotary feeders 14a, 14b, 14c is lower than the detection level I of the level sensors 27a, 27b, 27c. (Refer to FIG. 4), and a detection signal is sent to the control unit 28. The level sensors 27a, 27b, and 27c can be configured to turn on, for example, when the material level falls below the detection level I. The control unit 28 detects that a detection signal (ON signal) is input from all of the three level sensors 27a, 27b, and 27c, and drives the electric motor M based on the input of the signal to perform the central control. The rotary scraping blade 12 'is configured to be driven to rotate for a predetermined time (for example, Ta seconds). The level sensors 27a to 27c may be capacitive level sensors, for example.

The detection level I is such that the material in the hopper portion 3 moves into the small circular openings 6a to 6c, and the upper end levels of the materials in the short cylinders 7a to 7c are on the upper surface 5a of the bottom plate 5. 6 shows a predetermined level lower than the level (the level of the bottom plate 5). When the level of the material reaches the predetermined level, the material shown in FIG. 6 stays on the bottom plate 5 in the hopper portion 3. Will be. Accordingly, the predetermined level is detected by the level sensors 27a to 27c, and the rotation of the central rotary scraping blade 12 'is started.

FIG. 7 is a block diagram showing the electrical configuration of the multi-feeder according to the present invention. The electric motors M, Ma to Mc are connected, and the level sensors 27a, 27b, 27c and the proximity sensor 13 are connected. A control unit (programmable controller or CPU) 28 is provided for driving and controlling the motors M and Ma to Mc according to the operation procedure shown in FIG. 8 or FIG. 16 based on the signals from the sensors.

Reference numeral 29 denotes a timer for setting the drive time of the motor M, Ma to Mc, and 30 denotes an operation unit, which performs a drive start operation, a drive stop operation, a drive time setting operation of the motor M, and the like. Is.

FIG. 9 is a functional block diagram showing the operation of the control unit 28, and the functional block diagram will be described together with the following description of the operation.

The multi-feeder according to the present invention is configured as described above. Next, the operation of the multi-feeder of the present invention will be described.

First, for example, a granular material (for example, chip-shaped biomass fuel) is charged into the silo 1. Then, the storage tank 2 and the hopper 3 are filled with the powder material, and the powder material at the bottom of the hopper 3 ′ is fed from the small circular openings 6a, 6b, 6c at the bottom of the hopper 3 ′. It reaches the bottom plate 16 in each of the lower rotary feeders 14a, 14b, 14c, and is in a state of being filled up to the inner cylinders 15, 15, 15 of the respective rotary feeders 14a, 14b, 14c. At this time, the granular material in each of the rotary feeders 14a, 14b, and 14c flows out from the inner cylinder 15 into the annular passage R through the gap t5 with the angle of repose α of the granular material. (Refer to FIG. 4, powder material P ′).

In this state, the conveyor 26 is driven to rotate the conveyor belt 26a in the direction of arrow B. At the same time, when the operation start is operated from the operation unit 30, the control unit 28 (rotary feeder drive stopping means 28d in FIG. 9) first starts driving the electric motors Ma, Mb, Mc of the respective rotary feeders 14a, 14b, 14c (FIG. 9). 8 S1, S2, S3). Accordingly, the rotary blades 20, 20, 20 of the rotary feeders 14a, 14b, 14c start to rotate in the arrow A direction.

Then, the granular material that has flowed out into the annular passages R of the rotary feeders 14a, 14b, and 14c is conveyed in the direction of the arrow A by the claw 22 in the direction of the arrow A, and is discharged from the discharge ports 23a, 23b, and 23c. It is quantitatively discharged toward the lower conveyor via the discharge chutes 24a, 24b and 24c. At the same time, the granular material in each of the inner cylinders 15, 15, 15 is sequentially pushed out in the direction of the annular passage R by the rotation of the rotary blades 20, 20, 20, so that the granular material in the inner cylinder 15 Therefore, the particulate material stored in the silo 1 (storage tank 2, hopper 3) is quantitatively discharged onto the lower conveyor belt 26a by the three rotary feeders 14a, 14b, 14c. Then, the upper end level Q is lowered (see FIG. 4).

All the granular material discharged into the discharge chutes 24a, 24b, 24c is discharged onto the conveyor belt 26a of the conveyor 26, and the granular material supplied onto the belt 26a is discharged by the conveyor 26. It is conveyed in the direction of arrow B.

When the quantitative discharge operation is continued, the granular material is quantitatively discharged from the discharge chutes 24a, 24b, and 24c, so that the upper end level Q of the granular material is set from the storage tank 2 to the hopper portion. When the conical cap 11 is gradually exposed by lowering the hopper portion 3 further and lowering the upper surface 5a of the bottom plate 5, the upper end level Q of the granular material is The inside of the short cylinders 7a, 7b, and 7c gradually decreases (see FIG. 4).

In the process in which the upper end level Q of the granular material lowers the short cylinders 7a, 7b, 7c, the upper end level Q of the granular material becomes the detection level I of each level sensor 27a, 27b, 27c. , I and I, the level sensors 27a, 27b, and 27c send detection signals (ON signals) to the control unit 28.

The control unit 28 (level signal detection means 28a in FIG. 9) detects the detection signals from the level sensors 27a, 27b, 27c, respectively (S4, S5, S6 in FIG. 8). Here, when the control unit 28 (the scraped blade drive stopping unit 28b in FIG. 9) recognizes that the detection signals from all the level sensors 27a, 27b, and 27c have been detected (S7 in FIG. 8), the motor M Is driven for T minutes to start rotation of the central rotary scraping blade 12 '(S8, S9 in FIG. 8). Then, the central rotary scraping blade 12 'starts to rotate in the direction of arrow A for Ta minutes (for example, Ta = 5 minutes), and the timer 29 of the control unit 28 starts counting for the Ta minutes (S9 in FIG. 8). Although depending on the rotation speed, the number of rotations of the central rotary scraping blade 12 'is, for example, about 1 or 2 rotations during the 5 minutes.

FIG. 6 shows an example of the state of the granular material remaining in the hopper 3 ′ immediately before the central rotary scraping blade 12 ′ starts rotating. At this stage, the granular material in the short cylinders 7a, 7b, 7c becomes the detection levels I, I, I or lower, and thereafter, the rotary blades 20 of the rotary feeders 14a, 14b, 14c, 20 and 20 are sequentially discharged from the discharge ports 23a, 23b, and 23c to the discharge chutes 24a, 24b, and 24c. On the upper surface 5a of the bottom plate 5 of the hopper 3 ′, for example, It is assumed that the granular material P remains as shown in FIG.

In the case of FIG. 6, the granular material P remains on the portion of the upper surface 5a of the bottom plate 5 other than the small circular openings 6a, 6b, 6c (shaded portion in FIG. 6). Are located at an intermediate position between the small circular openings 6a and 6b, an intermediate position between the small circular openings 6b and 6c, and an intermediate position between the small circular openings 6c and 6a (substantially on the upper surface side of the spokes 12, 12, and 12). Radial ridge lines Na (three) are respectively formed, and downwardly inclined surfaces are formed in the directions of the small circular openings 6a, 6b, 6c from both sides of the ridge lines Na. The peripheral side is high and the conical cap 11 side is low in a curved line shape, the lower half of the conical cap 11 is covered with the powder, and the upper half of the conical cap 11 is exposed from the powder. It has become.

In such a situation, when the central rotary scraping blade 12 ′ starts to rotate in the direction of arrow A together with the conical cap 11 (S8 in FIG. 8), the spokes 12, 12, and 12 are moved on the front surface 12b on the rotational direction side. The powder material remaining on the upper surface 5 is scraped in the direction of the arrow A, and the powder material deposited on the spokes 12, 12, 12 is transferred in the direction of the arrow A, while the spokes 12, 12 and 12 rotate in the direction of arrow A while traversing substantially the entire opening on the upper surface of the small circular openings 6a, 6b and 6c.

Accordingly, when each of the spokes 12, 12, and 12 traverses the small circular openings 6a, 6b, and 6c, the granular material transferred by the spokes 12, 12, and 12 collapses, and each small circular opening. The parts 6a, 6b, and 6c are dropped and discharged into the rotary feeders 14a, 14b, and 14c. Further, since the conical cap 11 also rotates together with the central rotary scraping blade 12 ′, the staying material existing around the lower half of the conical cap 11 is also transferred in the rotation direction along with the rotation of the cap 11, Along with the rotation of each spoke 12, the residual material existing around the lower half of the cap 11 is also collapsed and dropped and discharged into the small circular openings 6a to 6c.

The granular material material discharged into the openings 6a, 6b, 6c is discharged through the continuous rotation in the direction of arrow A of the rotary blades 20, 20, 20 of the rotary feeders 14a, 14b, 14c. It is carried to 23a, 23b, 23c, and is discharged | emitted on the conveyor 26 below from each discharge chute 24a, 24b, 24c.

The length in the radial direction of each front surface 12b of each of the spokes 12, 12, 12 is longer than the diameter of each of the small circular openings 6a, 6b, 6c, and the substantially entire upper surface of the openings of these small circular openings 6a-6c. And the tips of the spokes 12, 12, 12 are close to the inner surface of the hopper 3, so that the spokes 12, 12, 12 effectively use the upper surface of the bottom plate 5. The granular material P remaining on 5a can be discharged into each small circular opening 6a, 6b, 6c.

Further, since the interval t3 is small, the small circular shape material P is scraped out on each front surface 12b of each spoke 12 while scraping the granular material P remaining on the upper surface 5a on each front surface 12b of the spokes 12, 12, 12. It can discharge | emit into opening part 6a, 6b, 6c.

When the control unit 28 (scraping blade drive stopping means 28b in FIG. 9) determines that the count value of the timer 29 has reached 5 minutes (S9 in FIG. 8), the proximity sensor 13 is provided with the stop waiting means 28c. (S10, S11 in FIG. 8), and the control unit 28 (stop standby means 28c in FIG. 9) is configured such that the spokes 12, 12, and 12 each have small circular openings. 6a, 6b, 6c, that is, when the protrusion 11c arrives immediately above the proximity sensor 13 and detects a signal from the proximity sensor 13 (S11 in FIG. 8), the scraping blade drive stop means 28b is used. Then, the motor M is stopped (S12 in FIG. 8). As a result, the spokes 12, 12, 12 of the central rotary scraping blade 12 'are positioned so that the spokes do not stop on the openings of the small circular openings 6a, 6b, 6c, that is, the small pieces shown in FIG. It stops at an intermediate position (on the upper surface 5a) between the circular openings 6a, 6b, 6c.

In a state where the spokes 12, 12, and 12 are stopped, almost all the granular material P remaining on the bottom plate 5 of the hopper 3 is discharged by the rotary feeders 14a, 14b, and 14c. Since all the granular material in 14a, 14b, 14c is also discharged onto the conveyor 26, the control unit 28 (rotary feeder drive stopping means 28d) is provided with the electric motors Ma, Mb of the rotary feeders 14a, 14b, 14c. Mc is stopped (S12, S13, S14 in FIG. 8). As a result, all of the granular material in the silo 1 including the granular material P remaining on the bottom plate 5 in the hopper 3 ′ is supplied cleanly on the conveyor 26 without substantially remaining. Can be discharged.

In the above embodiment, the operation of the multi-feeder is automatically performed by the control unit 28 based on the operation procedure of FIG. 8, but the central rotary scraping blade is based on the detection signals from the level sensors 27a to 27c. 12 'may be manually driven to rotate for a certain time or a certain number of rotations. In addition, the rotation stop operation of the central rotary scraping blade 12 ′ may be manually stopped based on the signal from the proximity sensor 13.

11, 12A and 12B show a second embodiment of the multi-feeder according to the present invention. Compared with the embodiment shown in FIGS. 1 and 3, a central rotary scraping blade 12 'and a conical shape are shown. The cap 11 is a separate body, the conical cap 11 is fixed to the short cylinder 4 (the hopper 3 ') with three support arms 11d, and the spokes 12, 12, 12 are supported on the lower surface side of the cap 11. A circular central disk 12d is connected to the rotary drive shaft 10. In the present embodiment, the same parts as those in the embodiment shown in FIGS. 1 and 3 are denoted by the same reference numerals, and the description thereof is omitted.

Each of the three support arms 11d extends horizontally from the side surface of the conical cap 11, and each tip is fixed to the inner peripheral surface 4c of the short tube 4 (hopper 3 '). The conical cap 11 is fixed so that its apex is located at the common central axis C. Each of the support arms 11d is formed in a triangular cross section having a radial ridge R ′ on the upper surface side (see FIG. 12B), and when the hopper portion 3 is filled with a granular material, The material is configured so as not to smoothly fall from the ridge R ′ onto the inclined surfaces on both sides and remain on the support arms 11d. The width T of the short tube 4 is larger than that of the short tube 4 of the embodiment shown in FIG.

The spokes 12, 12, and 12 of the central rotary scraping blade 12 ′ are radially formed around the central disk 12d around the common central axis C, and are provided at the center of the back surface of the central disk 12d. The spokes 12, 12, 12 can be rotated in the direction of arrow A by inserting and fitting the rotary drive shaft 10 into the recessed portion 12e. The central disk 12d has the same area as the lower surface of the conical cap 11, is located on the lower surface side of the fixed conical cap 11 via a gap t6, and is filled in the hopper portion 3. It is constituted so that the load of the granular material is not directly applied.

Further, a protrusion 12f detected by the proximity sensor 13 is provided on the back surface side of the central disk 12d at the center of the central rotary scraping blade 12 ′, and when the protrusion 12f arrives just above the proximity sensor 13, Control is performed in the same manner as described above so that each of the spokes 12, 12, and 12 can stop at a position that does not block the small circular openings 6a, 6b, and 6c (the same position as in FIG. 2). As shown in FIG. 12A, the stop positions of the spokes 12 are such that the spokes 12 are located just below the three support arms 11d. At the stop position, the spokes 12 , 12, 12 so that no material load is applied directly.

If comprised in this way, only the center rotation scraping blade | wing 12 'can be rotated in the fixed state of the cone-shaped cap 11, and the thrust load of the material concerning the cone-shaped cap 11 is directly in the center of the center rotation scraping blade | wing 12'. Since it does not act on the disk 12d, even if it is a heavy material, the central rotary scraping blade 12 'can be smoothly rotated by the electric motor M without exceeding the thrust load resistance of the speed reducer 9 (electric motor M). . 1 and 3, even if the conical cap 11 and the spokes 12, 12, and 12 are integrated, the thrust load applied to the conical cap 11 exceeds the thrust load resistance of the speed reducer 9 (electric motor M). If not, it can be used without problems.

FIG. 13, FIG. 14A, and FIG. 14B show a third embodiment of the multi-feeder according to the present invention, which is a further improvement of the second embodiment. The third embodiment is the same as the second embodiment in that the conical cap 11 and the central rotary scraping blade 12 'are separate from each other, but the conical cap 11 and the support arm 11d. Is configured such that the bridging of the granular material is less likely to occur.

That is, the support arm 11d is provided in three directions at an angle of 120 degrees with respect to the common central axis C as shown in FIGS. 14A and 15A, and each support arm 11d has a radial protrusion at the upper end. Each tip portion having a triangular cross section having a strip R ′ and close to the inner peripheral surface of the hopper portion 3 fixes the vertical plate 11d ′ in the radial direction to the lower surface portion of the projection R ′ of each support arm 11d. The vertical plates 11 d ′ are extended in the radial direction, and the tips of the vertical plates 11 d ′ are fixed to the inner peripheral side of the hopper 3 by welding.

When the support arm 11d having a triangular cross section is fixed to the inner peripheral surface of the hopper portion 3 as it is, a gentle ridge line along the inclined surface is formed on the left and right inclined surfaces of the support arm 11d and the inner peripheral surface of the hopper portion 3. From this ridge line, a bridge of the granular material is likely to occur. Therefore, the support arm 11d and the inner peripheral surface of the hopper 3 (hopper 3 ') are configured to be connected by the vertical plate 11d' to prevent the occurrence of the bridge as described above.

Further, the conical cap 11 is fixed to the upper side of the central joint portion 11e of the three support arms 11d with the center thereof aligned with the common central axis C. Specifically, as shown in FIGS. 15A to 15C, in the central joint portion 11e of each of the support arms 11d, the upward fixing plates 31 are provided at three locations at the same distance from the common central axis C. On the inner side (three locations) of the conical cap 11 corresponding to the fixing plate 31, downward fixing plates 32 (three locations) corresponding to the fixing plate 31 are projected to provide the conical cap 11. Placed on the central joint 11e of each support arm 11d with its center aligned with the common central axis C, the three fixed plates 32 and the corresponding fixed plates 31 are then bolted B The conical cap 11 is fixed so as to be placed on the protrusion R ′ at the center of the support arm 11d.

If comprised in this way, since the space S is formed between the lower surface side of the said conical cap 11, and the both-sides slope of the protrusion R 'of the said support arm 11d (refer FIG. 15A, FIG. 15C), the said hopper 3 'When the level of the granular material filled therein gradually decreases and the level decreases downward from the conical cap 11 through the support arm 11d, the lower surface of the conical cap 11 And the support arm 11d, there are no joints other than the three fixed plates 31 and 32, and the space S is formed. Therefore, from the lower edge 11 ′ of the conical cap 11 The descending granular material immediately descends from the lower edge 11 ′ along both inclined surfaces of the support arm 11d, and a bridge portion is connected to the connecting portion between the conical cap 11 and each support arm 11d. Starting point Gentle ridge absent made, it is possible to prevent the occurrence of the bridge due to powdered or granular material.

The central disk 12d of the central rotary scraping blade 12 'is connected to the rotary drive shaft 10 as in the second embodiment, and the basic configuration is the same as in the second embodiment. On the lower surface of the central disk 12d, there are three protruding portions (detected portions) at 120 degrees around the common central axis C corresponding to the spokes 12, 12, and 12 of the three central rotary scraping blades 12 '. 12f is formed (see FIG. 14A). The bottom plate 5 is provided with one proximity sensor 13 at a position corresponding to the rotation locus of the protruding portion 12f. Therefore, the proximity sensor 13 is configured so that each of the spokes 12, 12, and 12 of the central rotary writing blade 12 'rotates each of the central rotary scraping blades 12' rotated 120 degrees each time the spokes 12, 12, and 12 are rotated by 1/3 (120 degrees). The position of the spokes 12, 12, 12 can be detected.

Further, in the third embodiment, the hopper portion extends over the entire circumference of the inner surface of the hopper 3 ′ from the annular connection portion 3 c between the hopper portion 3 and the short tube 4 to the inside of the short tube 4. An annular extension plate 3 ″ is formed in an inverted conical shape (see FIG. 13). This annular extension plate 3 ″ extends the lower end portion of the hopper portion 3 downward while maintaining the inclination angle of the side surface. A gap t7 is formed between the annular extension plate 3 ″ and the bottom plate 5 (see FIG. 13). Thereby, the bottom plate 5 of the short tube 4 and the annular extension plate 3 ″ are formed. An annular space R ″ communicating with the inner space of the hopper 3 ′ is formed around the entire circumference.

The annular extension plate 3 ″ passes through the upper part on the inner peripheral side of the hopper 3 in each of the small circular openings 6a, 6b, 6c, whereby the annular space R ″ on the bottom plate 5 is rotated by the spoke 12 When viewed in the direction, when passing through the small circular openings 6a, 6b and 6c, the openings 6a ′, 6b ′ and 6c ′ are passed (see FIG. 14A). As shown in FIG. 14A, the openings 6a ′, 6b ′, and 6c ′ are portions where the annular extension 3 ″ and the small circular openings 6a, 6b, and 6c overlap in a plan view of the multi-feeder. In the opening portion of the small circular openings 6a, 6b, 6c, that is, in the annular space R ″ on the bottom plate 5 located on the lower side of the annular extension plate 3 ″, the bottom plate 5 is not present. Therefore, the bottom plate 5 exists in the annular space R ″ in an arc-shaped portion excluding the openings 6a ′, 6b ′, and 6c ′.

When the central rotary scraping blade 12 ′ is rotated, the granular material is gradually carried on the bottom plate 5 by the spokes 12, 12, 12 to the outer peripheral side, but is carried to the outer peripheral side. The particulate material accumulates, which provides a great resistance to the rotation of the central rotary scraping blade 12 '. In order to prevent this, the annular space R ″ along the inner peripheral surface of the hopper 3 ′ (short pipe 4) is provided as a refuge for the granular material, and the granular material carried to the outer peripheral portion is the annular shape. Guided to the space R ″, the granular material in the annular space R ″ is opened at the bent portions 12a, 12a and 12a of the spokes 12, 12, and 12 of the central rotary scraping blade 12 ′ through openings 6a ′ and 6b. ', 6c' is configured to be discharged into the small circular openings 6a, 6b, 6c. Therefore, the granular material in the annular space R "is deposited due to the presence of the annular extension plate 3". Therefore, it is discharged to the small circular openings 6a, 6b, 6c at an early stage, thereby preventing a large resistance from being generated on the spokes 12, 12, 12 of the central rotary scraping blade 12 'and smooth powder particles. The body material can be discharged.

Next, an operation method according to the third embodiment will be described.
The central rotary scraping blades 12, 12, and 12 are positioned at the position shown in FIG. 14A, that is, the spokes 12, 12, and 12 are respectively located below the support arms 11d, 11d, and 11d, as in the second embodiment. It shall be stopped at the center stop position (a position where the load of the remaining amount of the granular material is not applied). The stop position of each of the spokes 12, 12, and 12 of the central rotary scraping blade 12 'is referred to as a "central stop position". The "central stop position" is detected by the proximity sensor 13 and the control unit 28 (stop standby). It is assumed that the means 28c) recognizes the central stop position based on the signal from the proximity sensor 13.

The electric motors Ma, Mb, Mc are started to be driven in a state where the powder material is filled in the hopper 3 'and the rotary feeders 14a, 14b, 14c (S1 in FIG. 16).

Thereafter, the discharge of the granular material proceeds, and when any one of the level feeders 27a, 27b, 27c of the rotary feeders 14a, 14b, 14c is turned on, that is, any one of the rotary feeders 14a, 14b, 14c. When the level of the granular material is equal to or lower than the detection level I (the material level of the other rotary feeder is higher than the detection level I of the level sensor), the control unit 28 (level signal detection means 28a) detects this ( 16 (see S2, S3, and S4 via S17), and after waiting for a certain period of time to elapse by the timer 29 (S5 in FIG. 16), the control unit 28 (scraping blade drive stop means 28b) Drive in the positive direction (in the direction of arrow A) (for example, for several seconds), and then stop (see S6, S7, S8 in FIG. 16). Accordingly, the spokes 12, 12, 12 of the central rotary scraping blade 12 'are slightly rotated in the direction of arrow A and stopped. At this time, the spokes 12, 12, and 12 are rotated within a range in which the edge of each spoke 12 in the direction of arrow A does not protrude from the side edge of the corresponding support arm 11d, 11d, 11d in the direction of arrow A, or somewhat. The protruding range.

Thereafter, the control unit 28 reverses the electric motor M (in the direction of arrow A ′), and when the control unit 28 (stop standby means 28c) detects a signal from the proximity sensor 13 (at this time, the spokes 12, 12, 12 are in the center). (Refer to S9, S10, and S11 in FIG. 16), the motor M is further driven in the reverse direction (in the direction of arrow A ′) for a certain time (for example, several seconds), and then stopped (S12, FIG. 16). (See S13).

At this time, the range of rotation of the spokes 12, 12, 12 is such that the edge of each spoke 12 in the direction of arrow A ′ does not protrude from the side edge of the corresponding support arm 11d, 11d, 11d in the direction of arrow A ′. Range or slightly protruding range.

Thereafter, the control unit 28 (scraping blade drive stop means 28b) rotates the electric motor M forward again (in the direction of arrow A), and the control unit 28 (stop standby means 28c) detects a signal from the proximity sensor 13 (at this time). The spokes 12, 12, and 12 are located at the central stop position), and the electric motor M is stopped (see S14, S15, and S16 in FIG. 16).

As described above, when the signal from any one of the level sensors 27a, 27b, and 27c is detected, the control unit 28, at the lower position of the support arms 11d, 11d, and 11d, Within the range of the widths of 11d and 11d (the range that does not protrude from the width of the support arm 11d or the range that slightly protrudes), the spokes 12, 12, and 12 slightly rotate in the forward direction (arrow A direction) from the central stop position. Moved and stopped, then rotated slightly in the reverse direction (arrow A ′ direction) and returned to the central position, further rotated slightly in the reverse direction (arrow A ′ direction) from the central stop position, and stopped. Thereafter, an operation of rotating in the forward direction (arrow A direction) and returning to the center stop position (hereinafter, this operation is referred to as “forward / reverse swinging rotation operation”) is performed. In addition, the angle of the forward / reverse swinging movement of each spoke 12 is, for example, about 15 degrees).

Such forward / reverse oscillating rotation operation is continued until any two of the level sensors 27a, 27b, 27c are turned on, and then the discharge proceeds, and signals from all the level sensors 27a, 27b, 27c are transmitted to the control unit. When 28 (level signal detection means 28a) detects, the operation proceeds to step S17 and subsequent steps.

Due to the “forward / reverse swinging movement” of the spokes 12, 12, 12 of the central rotary scraping blade 12 ′, the granular material existing around the spokes 12, 12, 12 on the bottom plate 5 is removed. If the small circular openings 6a, 6b, 6c can move to the side, and if a bridge is generated between the support arms 11d, 11d, 11d and the bottom plate 5, such a bridge is assumed. Can be broken in advance. By such forward / reverse swinging / rotating operation, it is possible to prevent dead stock on the bottom plate 5 of the material.

Thereafter, when the control unit 28 (level detection means 28a) advances the discharge of the granular material and receives signals from all the level sensors 27a, 27b, 27c (of the rotary feeders 14a, 14b, 14c). In all cases, when the granular material becomes the detection level I or lower), the control unit 28 first reduces the material in all the level sensors 27a, 27b, and 27c in step S17 to the detection level I or lower. It is determined whether or not a certain time (for example, 10 minutes) has elapsed since the start (see S17 and S18 in FIG. 16). In this case, since 10 minutes have not yet elapsed, the control unit 28 (scraping blade drive) The stop means 28b) drives the electric motor M in the forward direction (arrow A direction), and the control unit 28 (stop standby means 28c) is based on the arrival of the adjacent spoke 12. Upon detecting a signal from the proximity sensor 13, to stop the motor M (see S19, S20, S21, S22 of FIG. 16). Therefore, the spokes 12, 12, and 12 of the central rotary scraping blade 12 'stop after rotating 1/3, ie, 120 degrees.

That is, the spokes 12, 12, and 12 of the central rotary scraping blade 12 'are rotated 120 degrees in the forward direction to the central stop position below the adjacent support arms 11d, 11d, and 11d, and at that position. Stop.

Due to the rotation of the spokes 12, 12, and 12 of the central rotary scraping blade 12 ′, the granular material remaining on the bottom plate 5 is conveyed to the small circular openings 6a, 6b, and 6c, respectively. It is discharged downward from the openings 6a to 6c.

At this time, the granular material located in the annular space R ″ is also smoothly conveyed in the annular space R ″ by the bent portions 12a, 12a, 12a of the spokes 12, 12, 12 of the central rotary scraping blade 12 ′. It is discharged into the small circular openings 6a, 6b, 6c.

Thereafter, the control unit 28 returns to step S17 (S22 (1) in FIG. 16). If all the level sensors 27a, 27b, and 27c are on, in step S18, all the level sensors 27a, 27b, and 27c are turned on. It is determined whether or not a certain time (for example, 10 minutes) has elapsed since the detection. If not, the 1/3 rotation operation (intermittent rotation operation) of the central rotary scraping blade 12 'is performed as described above. ). As described above, until the predetermined time elapses, the intermittent rotation operation of the central rotary scraping blade 12 (spokes 12, 12, 12) is repeated 120 degrees (1/3 rotation).

During the above operation, when the powder material is filled in the hopper 3 and any of the level sensors 27a, 27b, 27c is turned off in step S17, that is, the material is in any of the level sensors. When the detection level I is exceeded, the operation proceeds to the operations after the steps S2, S3, S4 (the above-described forward / reverse swinging rotation operation).

Then, for example, when 10 minutes have passed as a fixed time since the discharge of the granular material has progressed and all level sensors 27a, 27b, 27c are detected to be on in step S17 (S18 (2) in FIG. 16). The control unit 28 determines that the discharge of all the granular material has been completed, stops the electric motors Ma, Mb, Mc of each of the rotary feeders 14a, 14b, 14c and ends the operation (see FIG. S23 of FIG.

As described above, when all level sensors are turned on, the forward / reverse swing rotation operation is stopped until the material of any one of the small feeders 14a to 14c exceeds a predetermined level, and the central rotation scraping is performed. Each of the spokes 12 of the blade 12 'is repeatedly rotated intermittently by a fixed angle in the forward direction to the lower central stop position of the adjacent support arm 11d and stopped at that position. When the upper end level of the material in one level sensor 27a to 27c exceeds the predetermined level (detection level I), the intermittent rotation operation is stopped, and the upper end level of the material in all the level sensors is Until the predetermined level is reached, the above-described forward / reverse oscillating rotation operation is performed.

As described above, according to the present invention, after the material in the storage tank 2 and the hopper portion 3 is quantitatively discharged downward, the material remaining on the bottom plate 5 of the hopper 3 ′ by rotating the central rotary scraping blade 12 ′. For example, in a large silo where the diameter of the lower part of the hopper 3 exceeds 4 m, the material remains as much as possible with a relatively simple structure without forming a bottom with a complicated structure. Can be reduced.

Also, since there is no large fixed cone cone in the center of the bottom plate as in the conventional case, the storage volume can be further expanded.

Further, since the central rotary scraping blade 12 'can be stopped at a position where each spoke 12 does not block the openings of the small circular openings 6a to 6c, the quantitative discharge operation of the material by the plurality of rotary feeders 14a to 14c. In the middle, the central rotary scraping blade 12 'on the bottom board 5 does not affect the quantitative discharge operation of the material.

Further, the level sensor 27a indicates that the material remains on the upper surface of the bottom board 5.
Since the rotation of the central rotary scraping blade 12 'detected in the stop state can be started, the residual material can be discharged efficiently, and the central rotary scraping blade 12 is normally discharged during quantitative discharge. Since '(electric motor M) is stopped, power consumption can be suppressed by reducing the driving time of the central rotary scraping blade 12' as a multi-feeder and reducing the overall power.

Further, since each spoke 12 of the central rotary scraping blade 12 'can traverse substantially the entire opening of the small circular openings 6a to 6c, the material scraped by each spoke is efficiently put into the small circular openings 6a to 6c. Can be discharged. Further, since the conical cap 11 also rotates, the material remaining around the cap 11 can be smoothly collapsed and discharged downward.

Further, in the embodiment in which the conical cap 11 is fixed, since the thrust load of the material acting on the conical cap 11 does not directly act on the central rotary scraping blade 12 ', the central rotational scraping is smoothly performed even for a material with a large load. The vane 12 'can be rotated.

Further, the discharged material from the plurality of rotary feeders 14a to 14c can be received and conveyed by the single conveyor 26, and the material can be efficiently carried out.

In addition, even when applied to a large silo, for example, a small number (3 to 6) of rotary feeders can realize a discharge operation with little residual (see FIGS. 10A to 10C). Compared with the small radix, the cost can be reduced.

Further, according to the operation method of the multi-feeder of the present invention, during the normal discharging operation, the central rotary scraping blade 12 ′ is stopped, and the level of the material remaining on the upper surface of the bottom panel 5 is reached. Since the rotation of the central rotary scraping blade 12 'can be started when detected by the sensors 27a to 27c, the residual material can be discharged efficiently and the power consumption can be suppressed.

Further, since each spoke 12 of the central rotary scraping blade 12 'is stopped below the support arm 11d, the load of the material does not directly act on the spoke 12, so even if the material is heavy, The central rotary scraping blade 12 'can be smoothly rotated without exceeding the thrust load capacity.

In addition, since a gentle ridge line is not formed at the joint between the conical cap 11 and the support arm 11d, it is possible to suppress the occurrence of a material bridge at the connection between the conical cap 11 and the support arm 11d.

Further, an annular extension plate 3 ″ is provided on the inner peripheral surface of the hopper 3 ′, and the material sent in the outer peripheral direction on the bottom plate 5 is guided into the annular space R ″, thereby depositing the material in the vicinity of the outer peripheral portion of the bottom plate 5. It is possible to smoothly discharge the material on the outer peripheral portion of the bottom board.

Further, when the discharge of the material progresses and the material in any one of the small feeders 14a, 14b, 14c reaches a predetermined level, the center rotary scraping blade 12 ′ performs a forward / reverse swing rotation operation. The material bridge in the hopper can be broken at a relatively early stage to smoothly discharge the material thereafter, and the dead stock of the material on the bottom plate 5 can be eliminated.

In addition, after discharging the material in the storage tank and the hopper downward, intermittent rotation operation (for example, intermittent rotation by 1/3 rotation) until the spoke of the central rotary scraping blade 12 ′ reaches the lower side of the adjacent support arm 11 d. Therefore, it is possible to reduce the rotation range of the central rotary scraping blade 12 'as much as possible to save labor, and to effectively discharge the material remaining on the bottom board 5 into the small feeder. it can.

In the intermittent rotation operation, if the number of small circular openings is three, the spoke rotates by 1/3. For example, if the number of small circular openings is four, the spoke is 1/4. The number of spokes and the rotation angle can be changed according to the number of small circular openings.

According to the present invention, since the material can be discharged quantitatively and the power consumption can be suppressed while the residual material in the reservoir is reduced as much as possible, for example, in a large-diameter silo with a large capacity, (For example, biomass fuel, wood chips, coconut shells and other powders), coal and the like, and can be suitably used for quantitative discharge of sewage sludge and the like.

2 storage tank 3 hopper 3 'hopper 3 "annular extension plate 4c inner surface 5 bottom base 5a upper surface 6a to 6c small circular opening 10 rotary drive shaft 11 conical cap 11c protrusion 11d support arm 11d' vertical plate 11e center joint 12 Spoke 12 'Central rotary scraping blade 12f Protrusion 13 Proximity sensor 14a-14c Rotation feeder 23a-23c Discharge port 24a-24c Discharge chute 26 Conveyor 27a-27c Level sensor C Common central axis P, P' Material Q Upper end level t6 Gap R 'ridge R "annular space

Claims (18)

A hopper sharing a common central axis with the storage tank is provided at the bottom of the storage tank,
The bottom surface of the hopper is closed with a horizontal bottom plate, and a plurality of small circular openings are provided in the bottom plate around the common central axis.
A small feeder is connected to the lower side of each small circular opening, and the material supplied into the hopper is configured to be discharged downward by the plurality of small feeders.
Protruding a rotational drive shaft centered on the common central axis on the bottom plate and providing forward / reverse drive means for the rotational drive shaft,
A central rotary scraping blade having a plurality of spokes extending radially about the common central axis is fixed to the rotational drive shaft, and each spoke is disposed close to the upper surface of the bottom plate,
A conical cap centered on the common central axis is provided on the central upper surface of the central rotary scraping blade,
By rotating the central rotary scraping blade, the material remaining on the bottom plate can be transferred in the rotation direction and discharged into the small feeders through the small circular openings. Multi-feeder featuring The central rotary scraping blade and the conical cap are separated from each other, and the conical cap is arranged radially between the inner peripheral surface of the hopper and the conical cap so as not to block the small circular opening. Fixedly installed at the position around the common central axis by a plurality of support arms provided,
Providing a gap between the central rotary scraping blade and the conical cap;
The multi-feeder according to claim 1, wherein the central rotary scraping blade is configured to be rotatable in the fixed state of the conical cap. A position detection sensor for detecting the position of the spoke of the central rotary scraping blade is provided on the bottom plate,
Based on the signal from the position detection sensor, in the stopped state of the central rotary scraping blade, the position of each spoke stops at a position where the openings of the plurality of small circular openings are not blocked. The multi-feeder according to claim 1, wherein the multi-feeder is provided. A position detection sensor for detecting the position of the spoke of the central rotary scraping blade is provided on the bottom plate,
Based on the signal from the position detection sensor, the stop position of the central rotary scraping blade is a position where the position of each spoke does not block the openings of the plurality of small circular openings, and each support The multi-feeder according to claim 2, wherein the multi-feeder is configured to be a central stop position on the lower side of the arm. Each of the small feeders is provided with a level sensor capable of detecting that the upper end level of the material transferred from the small circular openings into the small feeders has become a predetermined level lower than the position of the bottom plate. ,
Based on detection that the upper end level of the material in all the level sensors has reached the predetermined level, the rotation of the central rotary scraping blade in a stopped state is configured to start. The multi-feeder according to any one of claims 1 to 4. Each of the small feeders is provided with a level sensor capable of detecting that the upper end level of the material transferred from the small circular openings into the small feeders has become a predetermined level lower than the position of the bottom plate. ,
Based on detection that the upper end level of the material in any one of the level sensors has reached the predetermined level,
5. The multi-feeder according to claim 4, wherein the forward / reverse drive means performs forward / reverse swinging / rotating operation of the central rotary scraping blade within a predetermined range below the support arm. Provided to each spoke a detected portion capable of detecting the central stop position for each of the spokes by a position detection sensor on the central rotating scraping blade,
Provided on the bottom plate a position detection sensor that can detect the arrival of each spoke at the central stop position,
Based on the detection that the upper end level of the material has reached the predetermined level in all the level sensors, the forward / reverse swing rotation operation is stopped, and the spokes of the central rotary scraping blade are adjacent to each other. The multi-feeder according to claim 6, wherein the multi-feeder is configured to perform an intermittent rotation operation of rotating by a predetermined angle in the forward direction to the central stop position below the support arm. The tip of each spoke of the central rotating scraping blade extends to a position close to the inner surface of the hopper,
8. The spoke according to claim 1, wherein each of the spokes is configured to traverse substantially the entire opening of each small circular opening by the rotation of the central rotary scraping blade. Multi-feeder. A single conveyor is provided under the plurality of small feeders,
The discharge port of each discharge chute of each of the small feeders is positioned above the single conveyor so that the discharged material from the plurality of small feeders can be conveyed by the single conveyor. The multi-feeder according to any one of claims 1 to 8, wherein The support arm has a triangular shape in cross section and forms a protrusion extending in the radial direction at each upper end, and a central joint portion of each support arm is provided at the center of the hopper,
8. The multi-feeder according to claim 2, 4, 6, or 7, wherein a lower end portion of the conical cap is fixed on the protrusion of each support arm at the central joint portion. 3. The support arm according to claim 2, wherein a vertical plate is fixed to a tip portion adjacent to the inner side surface of the hopper, and each vertical plate and the inner side surface of the hopper are connected and fixed. Or the multi-feeder of 4 or 6 or 7 or 10. An annular extension plate protruding toward the common central axis is provided on the inner peripheral surface near the bottom plate at the lower end of the hopper,
Forming an annular space communicating with the inside of the hopper below the annular extension plate;
The multi-feeder according to any one of claims 1 to 11, wherein tip ends of the spokes of the central rotary scraping blade are positioned in the annular space. The number of the small circular openings and the corresponding small feeders is any one of three to six,
The multi-circular opening according to any one of claims 1 to 12, wherein the small circular opening is formed on the bottom plate with a uniform opening angle around the common central axis. Feeder. The multi-feeder according to any one of claims 1 to 13, wherein the small-sized feeder is a rotary feeder. The operation method of the multi-feeder according to claim 1 or 2,
Each of the small feeders is provided with a level sensor capable of detecting that the upper end level of the material transferred from the small circular openings into the small feeders has become a predetermined level lower than the position of the bottom plate. ,
During the discharging operation by the small feeder, the central rotary scraping blade is in a stopped state, and based on the detection that the upper end level of the material in all the level sensors has reached the predetermined level, the stopped state A method of operating a multi-feeder, characterized in that the rotation of the central rotary scraping blade is started. A position detection sensor for detecting the position of the spoke of the central rotary scraping blade is provided on the bottom plate,
16. The multi-feeder according to claim 15, wherein the central rotary scraping blade is stopped based on a signal from the position detection sensor so that the spokes do not block the openings of the plurality of small circular openings. Driving method. A multi-feeder operation method according to claim 4,
Each of the small feeders is provided with a level sensor capable of detecting that the upper end level of the material transferred from the small circular openings into the small feeders has become a predetermined level lower than the position of the bottom plate. ,
During the discharging operation by the small feeder, the central rotary scraping blade is stopped, and based on the detection that the upper end level of the material at any one of the level sensors has reached the predetermined level,
A multi-feeder operating method characterized by performing forward / reverse swinging / rotating operation of the central rotary scraping blade by the forward / reverse drive means within a predetermined range below the support arm. Provided to each spoke a detected portion capable of detecting the central stop position for each of the spokes by a position detection sensor on the central rotating scraping blade,
Provided on the bottom plate a position detection sensor that can detect the arrival of each spoke at the central stop position,
During the discharging operation by the small feeder, the central rotary scraping blade is in a stopped state, and any one of the level sensors is detected based on the detection that the upper end level of the material has reached the predetermined level. Until the material of the small feeder exceeds the predetermined level, the forward / reverse swing rotation operation is stopped, and the spokes of the central rotary scraping blade are located at the central stop position below the adjacent support arm. The multi-feeder operation method according to claim 17, wherein the intermittent rotation operation of rotating at a predetermined angle in the forward direction and stopping at the position is repeated.

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