JP6768219B2 - How to operate the weighing device, gate and weighing device - Google Patents

Description

The present invention relates to a weighing technique.

Conventionally, a weighing device is known in which a weighing object (for example, cereals) stored in a storage tank is supplied to a measuring tank arranged below the weighing object and weighed by a load cell (for example, Patent Documents 1 to 1 below). 3). In this type of weighing device, the object to be weighed in the storage tank is supplied to the measuring tank by falling due to gravity when the supply gate located at the lower part of the storage tank is opened.

Special Fair 7-11568 Gazette Japanese Unexamined Patent Publication No. 2004-271350 Japanese Patent No. 3913156

In such a weighing device, vibration is generated by the impact when the weighing object falls into the measuring tank. Since this vibration causes a decrease in weighing accuracy, the load cell is usually used for weighing after waiting for the vibration to subside. However, when this waiting time becomes long, the time required for one cycle of weighing becomes long, and as a result, the processing capacity of the weighing device (for example, the processing amount per hour) is lowered. For these reasons, it is desired to reduce the standby time and improve the processing capacity of the weighing device.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following forms, for example.

According to the first aspect of the present invention, a weighing device is provided. This measuring device is a storage tank for storing a measurement object, and is provided below a storage tank, a storage tank having an opening formed at the bottom, a supply gate for opening and closing the opening, and storage. It is a measuring tank for storing a measuring object supplied from the tank through an opening, and is provided with a measuring tank supported by a load cell. The movement locus of the lower surface of the supply gate during the opening / closing operation of the supply gate is set to be located inside the measuring tank at least in the region directly below the opening.

According to such a measuring device, the supply gate is closed and the measuring object stored in the measuring tank is continuous with the measuring object in the storage tank, and then the supply gate is closed. By performing weighing by the load cell, while suppressing the object to be weighed from being scraped out by the supply gate and scattered to the outside of the measuring tank when the supply gate is closed, waiting from the closing operation of the supply gate to the weighing by the load cell. Time can be reduced. Specifically, since the supply gate is closed in a state where the measurement object in the storage tank and the measurement object stored in the measurement tank are continuous, the measurement in the storage tank is performed before the closing operation of the supply gate. The weighing tank is pressed down by the weight of the object. As a result, the vibration of the measuring tank generated when the object to be measured is supplied from the storage tank to the measuring tank can be quickly converged. Therefore, the waiting time from closing the supply gate to performing weighing can be reduced, and the processing capacity of the weighing device can be improved.

According to the second embodiment of the present invention, in the first embodiment, the opening is arranged inside the measuring tank. According to such a form, it is possible to further prevent the object to be measured from being scraped out by the supply gate and scattered to the outside of the measuring tank when the supply gate is closed.

According to the third aspect of the present invention, in the first or second embodiment, the measuring device is connected to the supply gate when the supply gate is closed after the object to be measured is supplied from the storage tank to the measuring tank. It is provided with a gap forming means for forming a gap between the measuring object stored in the measuring tank and the measuring object. According to such a form, the measurement accuracy can be improved because the supply gate and the measurement object in the measurement tank do not come into contact with each other during the measurement by the load cell.

According to the fourth aspect of the present invention, in the third aspect, the gap forming means projects downward from the lower surface of the supply gate toward the front end side in the traveling direction when the supply gate is closed. It is a provided protrusion. According to this form, when the supply gate is closed, the object to be measured is scraped out by the protrusion, so that the height of the protrusion is between the supply gate and the object to be measured stored in the measuring tank. There is a gap between them. Therefore, the gap can be easily formed.

According to a fifth aspect of the present invention, in the first or second aspect, the supply gate is configured to pivot around a fulcrum. The vertical cross section of the lower surface of the supply gate along the pivotal direction is arcuate. The arc shape is set so that the radius on the front side in the traveling direction when the supply gate is closed is larger than the radius on the rear side. According to this form, when the supply gate is closed, the object to be measured is scraped out by the portion of the supply gate on the front side in the traveling direction, so that a gap corresponding to the difference in radius is formed. Therefore, the gap can be easily formed. Moreover, since a gap can be formed only by devising the shape of the supply gate, a special device or structure for forming the gap is not required, and the number of parts can be reduced.

According to the sixth aspect of the present invention, in any one of the first to fifth forms, the movement locus has a storage tank at the front end of the movement locus in the traveling direction when the supply gate is closed. It is set to be located inside the outer edge of. According to such a form, it is possible to further prevent the object to be measured from being scraped out by the supply gate and scattered to the outside of the measuring tank when the supply gate is closed. Further, when the sixth form is applied to the third to fifth forms, the measurement object scraped out by the supply gate becomes a mountain near the outer edge of the storage tank, and a part of the mountain collapses. It is possible to prevent the gap from being filled by invading the gap.

According to the seventh aspect of the present invention, in any one of the first to sixth embodiments, the measuring device is a sensor capable of detecting whether or not a predetermined amount or more of the measurement object is stored in the storage tank. And a control unit that controls the operation of the weighing device. The control unit controls the weighing device so as to open the supply gate and supply the weighing object from the storage tank to the measuring tank when a predetermined amount or more of the weighing object is stored in the storage tank. According to such a form, a sufficient amount of the measurement object is stored in the storage tank so that the measurement object in the storage tank and the measurement object stored in the measurement tank are in a continuous state. After confirming with the sensor, the supply gate can be closed. Therefore, the control intended in the first embodiment can be reliably performed.

According to the eighth aspect of the present invention, in the seventh aspect, when the storage tank does not store a predetermined amount or more of the measurement object, the control unit waits until the predetermined amount or more of the measurement object is stored. After waiting, the supply gate is opened to control the weighing device in the first operation mode in which the weighing object is supplied from the storage tank to the measuring tank. According to such an embodiment, the control intended in the first embodiment can be reliably performed.

According to the ninth aspect of the present invention, in the seventh aspect, when the storage tank does not store a predetermined amount or more of the measurement object, the control unit waits until the predetermined amount or more of the measurement object is stored. The weighing device is controlled in the second operation mode in which the supply gate is opened to supply the weighing object from the storage tank to the measuring tank without waiting. When controlling the weighing device in the first operation mode, the time from closing the supply gate to starting weighing is the time after closing the supply gate when controlling the weighing device in the second operation mode. It is set shorter than the time until it is completed. According to this embodiment, when the supply amount of the measurement object to the storage tank is small, the measurement object stored in the storage tank and the measurement object in the measurement tank are continuous as the second operation mode. The supply gate can be closed before the state is reached. Therefore, there is no need to wait for an excessively long time until a predetermined amount or more of the measurement object is stored. As a result, the processing capacity of the weighing device can be improved. Further, the time from closing the supply gate to starting weighing in the case of controlling the weighing device in the second operation mode is measured after closing the supply gate in the case of controlling the weighing device in the first operation mode. Since it is longer than the time until the start of the vibration, it is possible to secure a sufficient time for the vibration to converge.

According to a tenth aspect of the present invention, a weighing device is provided. This measuring device is a storage tank for storing a measurement object, and is provided below a storage tank, a storage tank having an opening formed at the bottom, a supply gate for opening and closing the opening, and storage. It is a measuring tank for storing a measuring object supplied from the tank through an opening, and is provided with a measuring tank supported by a load cell. The weighing device closes the supply gate with the supply gate open and the weighing object in the storage tank and the weighing object stored in the weighing tank continuous, and then weighs with the load cell. Is configured to do. According to such a weighing device, as in the first embodiment, the waiting time from closing the supply gate to performing weighing can be reduced, and the processing capacity of the weighing device can be improved. It is also possible to apply any of the second to ninth forms to the tenth form.

According to the eleventh aspect of the present invention, a gate for use in a weighing device is provided. The gate comprises a gate body and a protrusion protruding from one surface of the gate body. According to such a gate, the same effect as that of the fourth embodiment is obtained.

According to a twelfth aspect of the present invention, a gate for use in a weighing device is provided. The gate comprises a surface having an arcuate vertical cross section. The arc shape is set so that the radius on one side along the arc shape is larger than the radius on the other side. According to such a gate, the same effect as that of the fifth embodiment is obtained.

According to the thirteenth aspect of the present invention, a method of operating the weighing device is provided. This method prepares a weighing device including a storage tank having an opening formed at the bottom, a supply gate for opening and closing the opening, and a measuring tank provided below the storage tank and supported by a load cell. The first step of opening the supply gate and supplying the weighing object stored in the storage tank to the measuring tank through the opening, and after the first step, the weighing object in the storage tank. A second step of closing the supply gate in a state where the weighing object stored in the measuring tank is continuous, and a third step of weighing the weighing object in the measuring tank by a load cell after the second step. It has the process of. According to this embodiment, as in the first embodiment, the waiting time from closing the supply gate to performing weighing can be reduced, and the processing capacity of the weighing device can be improved. It is also possible to apply any of the second to ninth forms to the thirteenth form.

It is sectional drawing which shows the schematic structure of the measuring apparatus as 1st Embodiment of this invention. It is a schematic diagram which shows the operation of a weighing device. It is a schematic diagram which shows the operation of a weighing device. It is a schematic diagram which shows the operation of a weighing device. It is a schematic diagram which shows the operation of a weighing device. It is a flowchart which shows the flow of the 1st operation mode of a measuring apparatus. It is a flowchart which shows the flow of the 2nd operation mode of a measuring apparatus. It is a side view which shows the shape of the supply gate of the measuring apparatus according to 2nd Embodiment. It is sectional drawing which shows the schematic structure of the measuring apparatus according to 3rd Embodiment.

FIG. 1 is a cross-sectional view showing a schematic configuration of a weighing device 20 according to the first embodiment of the present invention. The weighing device 20 is a device for measuring the weight of cereals in the present embodiment. However, the weighing device 20 can be used to weigh any granular or powdered substance. As shown in the figure, the measuring device 20 includes a storage tank 30, a supply gate 40, a measuring tank 50, a load cell 52, a sensor 70, and a control unit 80.

The storage tank 30 is connected to a supply line (not shown) at the upper part thereof. The weighing object 90 is continuously or intermittently supplied to the storage tank 30 from this supply line, and is temporarily stored in the storage tank 30. The capacity of the storage tank 30 is set to be sufficiently larger (for example, 1.5 times or more) than the capacity of the measuring tank 50 described later. An opening 31 is formed in the lower part of the storage tank 30. The storage tank 30 is formed in the vicinity of the opening 31 so that the cross section gradually decreases toward the opening 31. A supply gate 40 is provided in the vicinity of the opening 31 to open and close the opening 31. In the present embodiment, the supply gate 40 is configured to pivot around a fulcrum. The supply gate 40 is actuated by any actuator (eg, an air cylinder). Further, the supply gate 40 has an arc-shaped lower surface when viewed in a vertical cross section along its pivotal direction. A protrusion 41 is provided on the lower surface of the supply gate 40 so as to project downward from the lower surface. It is provided on the lower surface of the supply gate 40 on the front end side in the traveling direction (in the present embodiment, the front end in the traveling direction) when the supply gate 40 is closed. The role of the protrusion 41 will be described later. In the present embodiment, the supply gate 40 has a constant radius when viewed in a vertical cross section along its pivotal direction, except for a portion where the protrusion 41 is provided.

The measuring tank 50 is open above and is provided below the storage tank 30. When viewed in the vertical direction, the storage tank 30 is arranged substantially in the center of the measuring tank 50. The measuring tank 50 temporarily stores the measuring object 90 intermittently supplied from the storage tank 30 through the opening 31. The opening 31 is arranged inside the measuring tank 50. The measuring tank 50 is supported by a load cell 52. The load cell 52 is attached to a main body frame 55 having sufficient rigidity. In this embodiment, the measuring tank 50 is supported at one point by the load cell 52. However, the measuring tank 50 may be supported at two or more points.

A discharge port 51 is formed in the lower part of the measuring tank 50. Further, a discharge gate 60 for opening and closing the discharge port 51 is provided in the vicinity of the discharge port 51. The weighing object 90 stored in the measuring tank 50 is weighed by the load cell 52 and then discharged to a subsequent facility (for example, a storage tank, a conveyor, etc.).

The sensor 70 is arranged above the storage tank 30. The sensor 70 is a level sensor for detecting whether or not a predetermined amount or more of the measurement object 90 is stored in the storage tank 30. The control unit 80 includes a CPU and a memory, and controls the entire operation of the weighing device 20 by executing a program stored in the memory.

In the measuring device 20, the movement locus of the lower surface of the supply gate 40 during the opening / closing operation of the supply gate 40 is set to be located inside the measuring tank 50 at least in the region directly below the opening 31. FIG. 1 shows a movement locus 35 on the lower surface of the protrusion 41 formed on the supply gate 40 as a locus on the lower surface of the supply gate 40.

Hereinafter, the weighing operation of the weighing device 20 will be described. 2 to 5 are schematic views showing the operation of the weighing device 20. In FIGS. 2 to 5, the discharge gate 60 is not shown. When weighing using the weighing device 20, first, as shown in FIG. 2, the weighing object 90 is stored in the storage tank 30 in a state where the supply gate 40 is in the closed position. Next, as shown in FIG. 3, the control unit 80 pivots the supply gate 40 in the direction of the arrow A1 to open the supply gate 40. As a result, the object 90 to be measured in the storage tank 30 falls into the measuring tank 50 by gravity as shown by the arrow A2. At this time, since the measuring object 90 collides with the bottom surface of the measuring tank 50, the measuring tank 50 vibrates as shown by the arrow A3. The weighing device 20 has a function of quickly converging this vibration.

FIG. 4 shows a state in which the supply of the measurement object 90 from the measurement object 90 to the measurement tank 50 is completed. Since the measuring object 90 is stored from the bottom surface of the measuring tank 50 to the lower end of the storage tank 30, the flow of the measuring object 90 from the storage tank 30 to the measuring tank 50 is stopped. The supply gate 40 remains held in the open position. As described above, since the capacity of the storage tank 30 is larger than the capacity of the measuring tank 50, even when the measuring object 90 is intermittently supplied to the storage tank 30, the capacity of the storage tank 30 can be increased. Many weighing objects 90 remain. When the measurement target 90 is continuously supplied to the storage tank 30, more measurement target 90 will remain. In this state, in the region directly below the opening 31 of the storage tank 30, the measurement object 90 in the storage tank 30 is in a continuous state with the measurement object 90 stored in the measurement tank 50. Hereinafter, this state is also referred to as a continuous state. On the other hand, as described above, since the storage tank 30 is arranged substantially in the center of the measuring tank 50 when viewed in the vertical direction, the outer edge of the measuring object 90 is a space in which the measuring object 90 is not filled. Is formed. In particular, in the present embodiment, as described above, since the storage tank 30 is formed so that the cross section gradually becomes smaller toward the opening 31, the measuring object 90 is placed on the outer edge of the measuring object 90. Is hard to accumulate. Therefore, the space in which the weighing object 90 is not filled is formed relatively large.

In the state shown in FIG. 4, the measuring tank 50 is pressed downward by the weight of the measuring object 90 remaining in the storage tank 30. As a result, the vibration indicated by the arrow A3 in FIG. 3 is converged at an early stage.

After waiting for the vibration to converge, the control unit 80 pivots the supply gate 40 in the direction of arrow A5 and closes the supply gate 40, as shown in FIG. At this time, the surface of the object to be measured 90 is scraped out by the protrusion 41 toward the front in the traveling direction of the supply gate 40. As a result, a gap 53 is formed between the supply gate 40 and the measuring object 90 stored in the measuring tank 50. Therefore, at the time of weighing by the load cell 52, the supply gate 40 and the weighing object 90 in the measuring tank 50 do not come into contact with each other, so that the weighing accuracy can be improved.

Further, the movement locus 35 is set so that the end portion of the movement locus 35 on the front side in the traveling direction when the supply gate 40 is closed is located inside the outer edge portion 54 of the measuring tank 50. Therefore, it is possible to further prevent the measurement object 90 from being scraped out by the supply gate 40 and scattered to the outside of the measurement tank 50 when the supply gate 40 is closed. Further, the measurement object 90 scraped out by the supply gate 40 becomes a mountain near the outer edge 54 of the measurement tank 50, and a part of the mountain collapses and invades into the gap 53 to prevent the gap 53 from being filled. it can.

In this way, when the closing operation of the supply gate 40 is completed, the vibration is converged at an early stage as described with reference to FIG. 4, so that the weighing by the load cell 52 can be started with a short waiting time or without a waiting period. .. Therefore, as the waiting time is shortened, the time for one cycle of weighing is shortened, and the processing capacity of the weighing device 20 can be improved.

In the weighing device 20 described above, the control unit 80 controls the weighing device 20 by selecting one of the first operating mode and the second operating mode, as described below. May be good. FIG. 6 is a flowchart showing the flow of the first operation mode. The first operation mode is started with the supply gate 40 closed. When the first operation mode is started, as shown in the figure, the control unit 80 first determines whether or not a predetermined amount or more of the measurement target 90 is stored in the storage tank 30 (step S110). This determination is made using the detection result of the sensor 70. The predetermined amount is preset so that the continuous state described with reference to FIG. 4 can be realized when the supply gate 40 is opened.

As a result of the determination, when the measurement target 90 is not stored in a predetermined amount or more, the control unit 80 waits until the measurement target 90 is stored in a predetermined amount or more (step S110: No). On the other hand, when the measurement target 90 is stored in a predetermined amount or more (step S110: Yes), the control unit 80 opens the supply gate 40 and measures in the storage tank 30 as shown in FIG. The object 90 is supplied to the measuring tank 50 (step S120). Next, the control unit 80 closes the supply gate 40 as shown in FIG. 5 after the supply of the weighing object 90 is completed, that is, after the continuous state is reached as shown in FIG. 4 (step S130). .. The determination of the completion of the supply of the measurement object 90 may be made, for example, by whether or not a predetermined waiting time has elapsed. The predetermined waiting time is set experimentally or empirically in advance according to the characteristics of the object to be measured 90. Alternatively, a level sensor for determining whether or not the measuring object 90 in the measuring tank 50 reaches the lower end of the storage tank 30 may be provided in the measuring tank 50.

Next, when the supply gate 40 is closed, the control unit 80 waits for a time T1 (step S140). This time T1 is set shorter than that of the prior art in consideration of the above-mentioned effect of closing the supply gate 40 in the continuous state. Depending on the characteristics of the object to be measured 90 and the specifications of the measuring device 20, this time T1 may be zero. That is, the wait may be omitted.

After waiting for the time T1, the control unit 80 measures by the load cell 52 (step S150). When the weighing is completed, the control unit 80 opens the discharge gate 60 and discharges the weighing object 90 in the measuring tank 50 (step S160). Then, when the discharge is completed, the control unit 80 closes the discharge gate 60 (step S170). In this way, one cycle of weighing operation in the first operation mode is completed. This cycle is repeated. According to the first operation mode, the operation of closing the supply gate 40 can be reliably executed in the continuous state.

FIG. 7 is a flowchart showing the flow of the second operation mode. In FIG. 7, the same steps as those in the first operation mode are designated by the same reference numerals as those in FIG. Hereinafter, the points different from the first operation mode will be mainly described, and the points not particularly specified are the same as those of the first operation mode. In the first operation mode, when the second operation mode is started, as shown in the figure, the control unit 80 first determines whether or not a predetermined amount or more of the measurement object 90 is stored in the storage tank 30. Determine (step S110).

As a result of the determination, when the measurement object 90 is stored in a predetermined amount or more (step S110: Yes), the control unit 80 executes steps S120 to S170 to end one cycle of measurement. On the other hand, when the measurement target 90 is not stored in a predetermined amount or more (step S110: No), the control unit 80 opens the supply gate 40 and shifts the measurement target 90 in the storage tank 30 into the measurement tank 50. Supply (step S220). Then, when the supply of the weighing object 90 is completed, the control unit 80 closes the supply gate 40 (step S230). In this case, since the amount of the measurement object 90 stored in the storage tank 30 is small, the measurement object 90 in the storage tank 30 is not continuous with the measurement object 90 stored in the measurement tank 50. (Hereinafter, also referred to as a discontinuous state), the supply gate 40 is closed. Further, the time until the completion of the supply of the measurement object 90 is set shorter than that in step S130.

Then, when the supply gates 40 are closed, the control unit 80, by the time T2 to wait (step S 240). The time T2 is set longer than the time T1. That is, here, since the amount of the measurement object 90 stored in the storage tank 30 is small, the supply gate 40 is closed in a discontinuous state. Therefore, the waiting time (time T2) until the vibration is converged is set longer than the time T1. After waiting for the time T2, the control unit 80 executes steps S150 to S170 to end one cycle of weighing. According to the second operation mode, when the amount of the measurement object 90 stored in the storage tank 30 is large, the standby time can be shortened by closing the supply gate 40 in the continuous state. Further, when the amount of the measurement object 90 stored in the storage tank 30 is small, there is no need to wait for an excessively long time until the measurement object 90 of a predetermined amount or more is stored in the storage tank 30. Therefore, the processing capacity of the weighing device 20 can be improved. The above-described configuration is particularly advantageous when the measuring tank 50 is supported at one point by the load cell 52 as in the present embodiment, that is, when the vibration is difficult to converge. In other words, according to the above-described configuration, it is possible to achieve both a simple support structure of the measuring tank 50 and an improvement in the processing capacity of the measuring device 20.

The first operation mode and the second operation mode described above may be selected by the control unit 80 based on a user instruction input via the user interface included in the weighing device 20. Alternatively, the first operation mode and the second operation mode may be automatically selected by the control unit 80 according to the supply amount of the measurement object 90 supplied to the storage tank 30. For example, the control unit 80 monitors the storage status of the measurement target 90 in the storage tank 30 using the sensor 70, and sets the time for which the storage amount of the above-mentioned predetermined amount or more is secured to be a predetermined ratio or more within a predetermined period. If it occupies, the first operation mode may be selected, and if not, the second operation mode may be selected.

FIG. 8 is a side view showing the shape of the supply gate 340 of the weighing device according to the second embodiment of the present invention. The supply gate 340 is configured to pivot around the fulcrum 343 as in the first embodiment. The supply gate 340 has an arc-shaped lower surface when viewed in a vertical cross section along its pivotal direction. In the present embodiment, the radius R of the arc shape in the vertical cross section is not constant along the circumferential direction. Specifically, the radius R1 of the end portion 341 in front of the supply gate 340 in the traveling direction during the closing operation is larger than the radius R2 of the end portion 342 rearward in the traveling direction during the closing operation. Further, from the end portion 341 to the end portion 342, the radius R gradually decreases from the radius R1 to the radius R2 along the circumferential direction. Therefore, the movement locus 335 of the end portion 341 is located radially outside the movement locus 336 of the end portion 342 when viewed from the fulcrum 343.

Therefore, due to the closing operation of the supply gate 340, a gap 353 is formed between the supply gate 340 and the measurement object 90. According to such a configuration, the gap 353 can be formed only by devising the shape of the supply gate 340. Therefore, the number of parts can be reduced without the need for a special device or structure for forming a gap. This effect is not limited to the shape illustrated in FIG. 8, and is obtained when the radius on the front side in the traveling direction when the supply gate 340 is closed is set to be larger than the radius on the rear side. More specifically, when the supply gate 340 is in the closed position, the radius of the supply gate 340 in the region directly below the opening 31 is smaller than the radius on the front side in the traveling direction during the closing operation. The effect of is obtained.

FIG. 9 is a cross-sectional view showing a schematic configuration of the weighing device 420 according to the third embodiment of the present invention. Hereinafter, the measuring device 420 will be mainly described in terms of differences from the first embodiment, and the same as in the first embodiment except for points not particularly specified. The measuring device 420 includes a storage tank 430, a supply gate 440, a measuring tank 450, and a load cell 52. The supply gate 440 is a sliding type in the present embodiment, and opens and closes the opening 431 of the storage tank 430 by moving in the horizontal direction as shown by an arrow A6. A protrusion 441 that moves on the movement locus 435 when the supply gate 440 is closed is formed at the front end in the traveling direction when the supply gate 440 is closed. The protrusion 441 forms a gap 453 between the supply gate 440 and the measuring object 90 stored in the measuring tank 450 when the supply gate 440 is closed. Even with such a configuration, the same effect as that of the first embodiment can be obtained. Further, the measuring tank 450 is provided with, as an option, a scattering prevention wall 456 for preventing the measuring object 90 scraped out by the supply gate 440 from scattering to the outside of the measuring tank 50.

Although some embodiments of the present invention have been described above, the above-described embodiments of the invention are for facilitating the understanding of the present invention and do not limit the present invention. The present invention can be modified and improved without departing from the spirit of the present invention, and the present invention includes equivalents thereof. Further, in the range where at least a part of the above-mentioned problems can be solved, or in the range where at least a part of the effect is exhibited, the scope of claims and the combination of each component described in the specification can be combined or omitted. ..

For example, as the gap forming means for forming the gaps 53 and 453, any means can be used instead of the protrusions 41 and 441. For example, the gap forming means may be a means for blowing air along the lower surface of the supply gates 40 and 440 after closing the supply gates 40 and 440. Alternatively, the gap forming means may be an actuator that moves the storage tanks 30, 430 upward after closing the supply gates 40, 440.

Further, the openings 31, 431 may be arranged outside (that is, above) the measuring tanks 50, 450. Of course, the movement locus of the lower surfaces of the supply gates 40, 340, 440 may be located outside (that is, above) the measuring tanks 50, 450. In this case, the scattering prevention wall 456 may prevent the measurement object 90 from scattering outside the measuring tank 50.

20,420 ... Measuring device 30,430 ... Storage tank 31,431 ... Opening 35,335,336,435 ... Movement locus 40,340,440 ... Supply gate 41,441 ... Protruding part 50,450 ... Weighing tank 51 ... Exhaust Exit 52 ... Load cell 53,353,453 ... Gap 54 ... Outer edge 55 ... Body frame 60 ... Discharge gate 70 ... Sensor 80 ... Control unit 90 ... Weighing object 341, 342 ... End 343 ... Supporting point 456 ... Scattering prevention wall

Claims (6)

It is a weighing device
A storage tank for storing the object to be weighed, with an opening formed at the bottom,
A supply gate for opening and closing the opening,
A measuring tank provided below the storage tank and for storing the measuring object supplied from the storage tank through the opening, and a measuring tank supported by a load cell.
With
The lower surface of the moving locus of the feed gate during the opening and closing operation of the supply gate is set to be positioned inside the measuring tank in the area immediately below at least said opening,
The weighing device also
A sensor capable of detecting whether or not a predetermined amount or more of the measurement object is stored in the storage tank, and
It is provided with a control unit that controls the operation of the weighing device.
The control unit opens the supply gate to supply the measurement object from the storage tank to the measurement tank when the measurement target is stored in the storage tank in an amount equal to or larger than the predetermined amount. Control the device ,
The control unit can control the weighing device by selecting one of the first operation mode and the second operation mode.
In the first operation mode
When the measurement object of the predetermined amount or more is not stored in the storage tank, after waiting until the measurement object of the predetermined amount or more is stored (S110) , the supply gate is opened (S120) and the storage is performed. The object to be weighed is supplied from the tank to the measuring tank ,
Further, the supply gate is closed (S130) in a state where the supply gate is opened and the measurement object in the storage tank and the measurement object stored in the measurement tank are continuous (S130). ), Wait for the first standby time T1 (S140), and then perform weighing by the load cell (S150) .
In the second operation mode,
When the storage tank does not store the measurement target in the predetermined amount or more, the control unit opens the supply gate without waiting until the measurement target in the predetermined amount or more is stored (S220). ) The object to be weighed is supplied from the storage tank to the measuring tank .
Further, the supply gate 40 is closed (S230) in a state where the measurement object in the storage tank is not continuous with the measurement object stored in the measurement tank.
Next, when the supply gate is closed, the control unit 80 waits for the second standby time T2 (step S240), and the second standby time T2 is set longer than the first standby time T1. After waiting for the second standby time T2, weighing by the load cell is performed (S150).
The time from closing the supply gate to starting weighing in the case of controlling the weighing device in the first operation mode is the time for controlling the weighing device in the second operation mode. A weighing device set shorter than the time from closing to starting weighing. The weighing device according to claim 1.
The opening is a measuring device arranged inside the measuring tank. The weighing device according to claim 1 or 2.
When the supply gate is closed after the measuring object is supplied from the storage tank to the measuring tank, a gap is formed between the supply gate and the measuring object stored in the measuring tank. A weighing device including a gap forming means for forming a gap. The weighing device according to claim 3.
The gap forming means is a measuring device that is a protruding portion provided on the lower surface of the supply gate so as to project downward from the lower surface on the front end side in the traveling direction when the supply gate is closed. The weighing device according to claim 1 or 2.
The supply gate is configured to pivot around a fulcrum.
The vertical cross section of the lower surface of the supply gate along the pivotal direction is arcuate.
The arc shape is a weighing device set so that the radius on the front side in the traveling direction when the supply gate is closed is larger than the radius on the rear side. The weighing device according to any one of claims 1 to 5.
The movement locus is a measuring device set so that the end portion of the movement locus on the front side in the traveling direction when the supply gate is closed is located inside the outer edge portion of the storage tank.

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