AU2018259465B2

AU2018259465B2 - Pneumatic conveying feeder and transfer pipe connecting structure

Info

Publication number: AU2018259465B2
Application number: AU2018259465A
Authority: AU
Inventors: Haixi HE; Yunfeng Ma; Shusheng Wang
Original assignee: CISDI Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd
Priority date: 2017-04-26
Filing date: 2018-02-28
Publication date: 2021-04-15
Anticipated expiration: 2038-02-28
Also published as: MY198263A; WO2018196479A1; RU2734648C1; AU2018259465A1; CN106865235A; CN106865235B

Abstract

Disclosed is a pneumatic conveying feeder, comprising a middle circular cylinder (2), an upper flange (1), a lower flange (4), an impeller (3) and a transmission device. By means of arranging at least two feed inlets (14) on the upper flange (1), making the number of feed outlets (41) the same as the number of feed inlets (14) and arranging the feed outlets (41) and the feed inlets (14) in a staggered manner, the invention realises an increase in space utilization rate of the device, so as to increase the feeding ability of a single device. By means of arranging a groove-shaped air distribution cavity (12) at the positions of a lower surface of the upper flange (4) corresponding to each feed outlet (41), the invention changes the blowing method, so as to increase the blowing ability and blowing concentration of a single device with the same diameter with regard to materials, and reduce operating costs of the device. Further disclosed is a transfer pipe connecting structure, which, by means of changing the connection relationship between transfer pipelines, while ensuring the flow precision for blowing materials, can not only realise a feeder blowing a reactor in a traditional manner, but can also realise a feeder blowing two reactors, thereby saving on costs for a user.

Description

as per assembly note page 1-3 do not exist. Description starts with page 4

Description PNEUMATIC CONVEYING FEEDER AND CONVEYING PIPE CONNECTING STRUCTURE

Technical Field

The present invention belongs to the field of pneumatic conveying equipment for bulk materials, and particularly relates to a pneumatic conveying feeder and a conveying pipe connecting structure.

Background

In industries such as metallurgy, the pneumatic conveying of bulk materials has relatively high requirements for conveying capacity and conveying accuracy. Usually, a vertical rotary feeder is used for conveying, which can achieve a higher conveying accuracy than a feeder in ordinary fluidized pressurization mode. Disclosed Chinese patents of vertical feeders which are often used in engineering at present are: 201220205422.9, 201020619756.1, 201220673793.X, 201320480948.2, 201620306364.7 and 201620622572.8. According to the information disclosed, each single feeder has one feed port and one discharge port which are in 180 staggered arrangement, and a single-channel material conveying mode is formed in the feeder, so the feeder has the disadvantages that: the space utilization rate of the feeder with a single-channel structure is relatively low, and the feeding capacity of the feeder is insufficient, so that the users' investment cost is relatively high; in order to improve the discharge capacity of the single discharge port, the opening of the discharge port is relatively large, causing a great waste of injection air, so that the users' operating cost is relatively high; the included angle between the feed port and the discharge port of the single-channel structure is 180, causing an eccentric discharging of an injection tank, so that it is unable to achieve stable whole discharging; and the non-uniform arrangement of the injection nozzles also causes a certain waste of air. The single-channel structure can only be used for injection to one reactor, so one reactor shall be equipped with at least one feeder, and is often necessary to be equipped with multiple feeders to achieve the injection capacity.

Description As shown in the disclosed patents 201320485328.8 and 201310346847.0, multiple feed ports and discharge ports are provided, but the shape of the feed ports and the discharge ports and the shape of vanes or the conveying mode of materials in the feeder are greatly different from those of a traditional vertical rotary feeder. These solutions mainly solve the accuracy problem of traditional fluidized pressurization mode. Due to the limitation of the shape of the feed ports and the discharge ports, the shape of the vanes and the conveying mode, compared with an ordinary vertical feeder, the capacity and space utilization rate of the feeder are not improved, and the supporting injection and conveying mode is less diversified. The disclosed patent 201210217828.3 is a two-channel star-shaped feeder which has a feeding/discharging form and a working mode greatly different from those of a traditional vertical rotary feeder and mainly adopts the form of a horizontal star valve. According to the information disclosed, due to its inherent characteristics, this form is less used in occasions with relatively high accuracy requirements.

Summary

In view of this, the purpose of the present invention is to provide a pneumatic conveying feeder with high conveying accuracy, high conveying concentration, compact structure, high efficiency, and flexible and convenient control. The present invention also provides a conveying pipe connecting structure suitable for the pneumatic conveying feeder, which can be adapted to a variety of working conditions by improving the piping mode.

Description To achieve the above purpose, the present invention provides the following technical solution: a pneumatic conveying feeder, comprising a middle cylinder, an upper flange and a lower flange correspondingly arranged on both ends of the middle cylinder, an impeller arranged in the middle cylinder and a sealed bearing seat arranged below the lower flange; feed ports and discharge ports are correspondingly formed on the upper flange and the lower flange; each discharge port is correspondingly connected with a discharge pipe; the impeller is connected with a rotation shaft penetrating through the sealed bearing seat and is driven to rotate by a driving device on the other end of the rotation shaft; there are at least two feed ports which are uniformly spaced along the circumferential direction of the upper flange; the quantity of the discharge ports is the same as that of the feed ports, and the discharge portsandthefeedports are in staggered arrangement; groove-shaped air distributing cavities are formed in the lower surface of the upper flange at positions corresponding to the discharge ports; air inlet holes in communication with the groove-shaped air distributing cavities are formed in the side surface of the upper flange; and the cross-sectional shape of each groove-shaped air distributing cavity is the same as the shape of each discharge port. Further, a perforated plate is arranged below the groove-shaped air distributing cavities, and a plurality of air injection holes are distributed in an array on the perforated plate. Further, there are two feed ports which are arranged on the upper flange with an included angle of 180; there are two discharge ports, and the included angle between the projections of adjacent feed port and discharge port is 90. Further, the two feed ports are fan-shaped holes with the same size, rectangular strip plates are arranged at the feed ports, and the center line of each strip plate does not pass through the center of rotation of the impeller. Further, the driving device includes a drive gear reducer connected with the rotation shaft and a variable frequency motor connected with the drive gear reducer; a cavity is formed in the lower part of the sealed bearing seat; a detecting element is arranged on the circumferential side wall of the sealed bearing seat corresponding to the cavity; and an induction plate is correspondingly arranged on the rotation shaft in the cavity. Further, a hard alloy layer is fixed by build-up welding on parts of the feeder that are easy to be worn by materials. Further, a pressure equalizing exhaust pipe is arranged on the middle cylinder; the pressure equalizing exhaust pipe is correspondingly arranged on a non-material flowing channel side of the discharge ports; and a check valve is arranged on a communicating pipe between the pressure equalizing exhaust pipe and an injection tank. Further, an arched guide surface is arranged on the upper surface of the upper flange.

Description Further, the cross-sectional area of the cells formed between vanes of the impeller is reduced progressively from top down. The present invention also provides a conveying pipe connecting structure suitable for the pneumatic conveying feeder, comprising conveying pipes which are connected in one-to-one correspondence with the discharge pipes and reactor(s); the front end of each conveying pipe is connected with an air supply; each conveying pipe is respectively and correspondingly connected with the other conveying pipes through a manifold; a material shutoff valve is arranged on each conveying pipe and manifold; and the material shutoff valve arranged on each conveying pipe is located between the manifold outlet and inlet of the conveying pipe. The present invention has the following beneficial effects: the feeder has at least two feed ports and discharge ports forming a multi-channel material conveying structure with the rotary impeller, which improves the space utilization rate of the feeder on the premise of ensuring the feeding accuracy, and therefore the feeding capacity of a single feeder is improved. In order to improve the filling rate of the feed ports, the running speed of the impeller can be reduced appropriately, thereby making the feeder run more reliably. Strip plates are arranged at the feeding ports and a truncated cone-shaped impeller hub is adopted, so that the materials in the impeller cells are fully mixed and filled at the feeding ports and bridge formation is avoided. A perforated plate of the air distributing cavities is used for injection, which can effectively improve the injection efficiency and injection concentration, so that the amount of air used for injection is saved and the operating cost is saved for users. A speed detecting element is arranged in at the cavity position of the sealed bearing seat, which is favorable for sealing and can effectively prevent signal interference, so that the control accuracy of the feeder is increased. A hard alloy layer is fixed by build-up welding on parts easy to be worn, so that the service life and stability of the feeder are increased. The conveying pipe connecting structure suitable for the feeder has multiple communication forms, which provides a more economic and flexible configuration mode for the feeding of multiple reactors, so that the investment cost is saved for users.

Description of Drawings

To enable the purpose, the technical solution and the beneficial effects of the present invention to be clearer, the present invention provides the following drawings for explanation: Fig. 1 is a schematic diagram of a general arrangement of the present invention; Fig. 2 is a schematic diagram of a transport process of materials inside the feeder; Fig. 3 is a sectional view of an internal structure of the feeder; Fig. 4 is a top view of the feeder.

Description Detailed Description

Preferred embodiments of the present invention will be described below in detail in combination with drawings. As shown in the figures, a pneumatic conveying feeder in the present invention comprises a middle cylinder 2, an upper flange 1 and a lower flange 4 correspondingly arranged on both ends of the middle cylinder 2, an impeller 3 arranged in the middle cylinder 2 and a sealed bearing seat 5 arranged below the lower flange 4; feed ports 14 and discharge ports 41 are correspondingly formed on the upper flange 1 and the lower flange 4; each discharge port 41 is correspondingly connected with a discharge pipe 42; the impeller 3 is connected with a rotation shaft 51 penetrating through the sealed bearing seat 5 and is driven to rotate by a driving device on the other end of the rotation shaft 51; there are at least two feed ports 14 which are uniformly spaced along the circumferential direction of the upper flange 1; the quantity of the discharge ports 41 is the same as that of the feed ports 14, and the discharge ports 41 and the feed ports 14 are in staggered arrangement; groove-shaped air distributing cavities 12 are formed in the lower surface of the upper flange 1 at positions corresponding to the discharge ports 41; air inlet holes 11 in communication with the groove-shaped air distributing cavities 12 are formed in the side surface of the upper flange 1; and the cross-sectional shape of each groove-shaped air distributing cavity 12 is the same as the shape of each discharge port 41.

Description Specifically, the upper surface of the upper flange is connected with the bottom of an injection tank 7; the upper and lower surfaces of the middle cylinder are correspondingly connected with the lower surface of the upper flange and the lower flange; the impeller 3 is installed in the middle cylinder, is concentric with the middle cylinder, and has the same height with the middle cylinder; the sealed bearing seat 5 is arranged on the lower part of the lower flange; the lower part of the rotation shaft 51 is connected with the a drive gear reducer 52 in the driving device; the drive gear reducer 52 is connected with a variable frequency motor 53; and the upper part of the rotation shaft 51 extends through the sealed bearing seat into the center of the impeller 3 and drives the impeller 3 to rotate together. As the interior of the feeder is subjected to a high pressure, a sealing ring (not shown in the figures) is arranged between the connecting surface of the upper flange 1 and the middle cylinder 2 and the connecting surface of the middle cylinder 2 and the lower flange, and the sealing ring is compressed and connected by bolts. In the embodiment, there are two feed ports 14 which are arranged on the upper flange 1 with an included angle of 180; there are two discharge ports 41, and the included angle between the projections of adjacent feed port and discharge port is 90 ° The space utilization rate of the feeder

can be increased by this structure, and therefore the feeding capacity of a single feeder can be increased. The materials falling from the injection tank respectively pass through the two feed ports 14 and enter the cells between vanes of the impeller 3; with the rotation of the impeller 3, the materials are respectively brought to the discharge port 41 at the nearest position in the circumferential direction; and a two-channel material conveying structure is formed through the two feed ports 14, the impeller cells 31 and the two discharge ports 41. Of course, in the condition that the arrangement space is satisfactory, three groups of feed ports and discharge ports in staggered arrangement can be provided according to the circumstances, so as to form a three-channel material conveying structure.

Description In the embodiment, groove-shaped air distributing cavities 12 matched with the discharge ports in shape are formed in the lower surface of the upper flange 1 at positions directly opposite to each discharge port 41 of the lower flange 4, air inlet holes11 in communication with the groove-shaped air distributing cavities 12 are formed in the side surface of the upper flange 1, a perforated plate 13 is installed below the groove-shaped air distributing cavities 12, a plurality of air injection holes are distributed in an array on the perforated plate 13, and the notches of the groove-shaped air distributing cavities 12 can be blocked by the perforated plate 13 to make air passes through the injection holes in the perforated plate 13 only to inject materials, so that the materials at the discharge ports 41 are injected into correspondingly connected material conveying pipes by high-pressure air from the perforated plate 13 through the discharge ports and discharge pipes. In the embodiment, the two feed ports 14 formed on the upper flange are holes with a fan-shaped cross section and with the same size, and the size of holes with a fan-shaped cross section is calculated according to the flow property of materials in order to ensure that the materials are fully filled in the impeller cells 31. In order to make the materials uniformly distributed in the impeller cells 31, two strip plates 15 can be arranged at each feed port 14, and the center line of each strip plate 15 does not pass through the center of rotation of the impeller, so that the materials on the upper surface of the impeller cells 31 are subject to an additional centripetal force or centrifugal force when moving relatively to the strip plates 15, thereby making the materials move in the impeller cells and achieving the purpose of mixing and filling the materials in the impeller cells. The shape of the strip plates 15 here is preferred to be a rectangle. In the embodiment, a cavity is formed at the connecting position of the lower part of the sealed bearing seat 5 and the drive gear reducer 52, and the cavity shall be insulated from the bearing installed in the sealed bearing seat 5 to prevent lubricating oil from seeping into the cavity. An opening is formed in the circumferential side wall of the sealed bearing seat 5 corresponding to the cavity, a detecting element 54 is arranged at the opening, an induction plate 55 is correspondingly arranged on the rotation shaft 51 in the cavity, and the rotational speed of the rotating shaft 51 is detected by the detecting element 54 through the pulse of the induction plate 55 on the rotation shaft 51. In order to increase the service life of the wearing part of the feeder, a hard alloy layer 6 is fixed by build-up welding on parts of the feeder of the embodiment that are easy to be worn, such as on the lower surface of the upper flange 1, the upper surface of the lower flange 4, the inner surface of the middle cylinder 2, the outer surface of the impeller 3, the inner surface of each discharge port 41, and the inner surface of each discharge pipe 42.

Description As a further improvement of the above solution, a pressure equalizing exhaust pipe 21 is arranged on the middle cylinder 2 in the embodiment, and the pressure equalizing exhaust pipe 21 is correspondingly arranged on a non-material flowing channel side of the discharge ports 41 (materials entering the impeller cells from the feed ports are brought into the feed ports by the rotating impeller, the materials are pushed into the discharge ports from one side of the discharge ports by the rotating impeller according to the rotating direction, the side from which materials are pushed into is a material flowing channel side, and the other side is a non-material flowing channel side); the pressure equalizing exhaust pipe 21 is connected with the injection tank 7 through a communicating pipe, and a check valve DO1 is arranged on the communicating pipe. The pressure equalizing exhaust pipe 21 can prevent high-pressure air from back flushing the materials at the feed ports, so that the materials of the injection tank 7 are prevented from entering the pressure equalizing exhaust pipe 21; and the check valve DO1 can prevent the materials from directly entering the feeder through the communicating pipe. In order to increase the fluidity of the materials on the upper surface of the flange 1, an arched guide surface (not shown in the figures) is fixed on the upper surface (at a position other than the feed ports) of the upper flange 1 in the embodiment to guide the materials to the feed ports 14. Fluidized air holes are formed in the arched guide surface, and the outlets of the air holes are directed to the feed ports 14, thereby further increasing the fluidity of the materials on the upper surface of the flange 1. As a further improvement of the above solution, the cross-sectional area of the cells 31 formed between vanes of the impeller is reduced progressively from top down to facilitate the flowing of the materials and the full filling of the cells. The impeller hub in the embodiment is truncated cone-shaped, the generatrix of the truncated cone can adopt a streamline shape such as hyperbola and other curves, and the shape of the generatrix of the truncated cone can be selected properly according to the manufacturing difficulty in practice. As a further improvement of the above solution, another sealed bearing seat can be fixed in the center of the upper flange 1, the lubricant grease of the bearing of the sealed bearing seat can be supplied (not shown in the figures) through a pipe arranged on the upper flange 1 to increase the running stability of the impeller 3. In order to prevent dust from entering the bearing, in addition to the dust-proof sealing ring installed in the sealed bearing seat 5, an air seal structure can also be provided, and the pressure of the sealing air shall be slightly higher than that of the injection tank.

Description In order to increase the fluidity of the materials in the discharge pipes 42, fluidized air holes can be formed in the inner wall of each discharge port 41 or/and the discharge pipes 42; and in order to facilitate the uniformity of fluidization, the air holes shall be multiple small holes, and the injection direction of fluidized air shall be close to the flowing direction of the materials. A conveying pipe connecting structure suitable for the pneumatic conveying feeder, comprising conveying pipes which are connected in one-to-one correspondence with the discharge pipes and reactor(s); the front end of each conveying pipe is connected with an air supply; each conveying pipe is respectively and correspondingly connected with the other conveying pipes through a manifold; a material shutoff valve is arranged on each conveying pipe and manifold; and the material shutoff valve arranged on each conveying pipe is located between the manifold outlet and inlet of the conveying pipe. In the embodiment, the conveying pipe connecting structure is matching connection with the discharge ports of the feeder through two material conveying pipes 01 and 02, the front ends of the conveying pipes 01 and 02 are correspondingly connected with air supplies TO1 and T02 which inject air for material conveying to make the materials entering the two conveying pipes able to be conveyed by injection towards reactors Fl and F2, and two conveying control modes can be adopted as required in use; The first control mode is that the two-channel pneumatic conveying feeder feeds one reactor only: the two conveying pipes 01 and 02 converge to either of the conveying pipes 01 and 02 at an appropriate position through a manifold, and the converged conveying pipe 01 or 02 is connected with a reactor Fl or F2; The second control mode is that the two-channel pneumatic conveying feeder feeds two reactors: the two conveying pipes 01 and 02 are respectively connected with two reactors F1 and F2, a manifold is arranged at an appropriate position to make the conveying pipes 01 and 02 in communication with each other and form a manifold crosswise-converged conveying structure, material shutoff valves S01 and S02 are respectively arranged near the corresponding manifold outlets of the conveying pipes 01 and 02, material shutoff valves V1 and V02 are correspondingly arranged on the conveying pipes 01 and 02, and the material shutoff valves VO1 and V02 are respectively located between the manifold outlets and inlets of the conveying pipes 01 and 02. When materials need to be feed to both reactors Fl and F2, the valves S01 and S02 are closed, the valves VO and V02 are opened, and materials are respectively conveyed to reactors Fl and F2 through conveying pipes 01 and 02 by injection; When materials need to be feed to only one of the reactors Fl and F2, the valves SO1, S02, VO1 and V02 are controlled to make the materials discharged by the feeder feed to only one reactor. Finally, it should be noted that the above preferred embodiment is only used for describing the

Description technical solution of the present invention rather than limiting the present invention. Although the present invention is already described in detail through the above preferred embodiment, those skilled in the art shall understand that various changes in form and detail can be made to the present invention without departing from the scope defined by claims of the present invention.

Claims

Claims 1. A pneumatic conveying feeder, comprising a middle cylinder, an upper flange and a lower flange correspondingly arranged on both ends of the middle cylinder; feed ports and discharge ports are correspondingly formed on the upper flange and the lower flange; the quantity of the discharge ports is the same as that of the feed ports, and the discharge ports and the feed ports are in staggered arrangement; an impeller with a progressively reduced cross-sectional area of cells from top down formed between vanes arranged in the middle cylinder and a sealed bearing seat arranged below the lower flange; air inlet holes in communication with a groove-shaped air distributing cavities are formed in the side surface of the upper flange; notches of the groove-shaped air distributing cavities are blocked by a perforated plate, and a plurality of air injection holes are distributed in an array on the perforated plate; and the cross-sectional shape of each groove-shaped air distributing cavity is the same as the shape of each discharge port.
2. The pneumatic conveying feeder according to claim 1, characterized in that a detecting element is arranged on the circumferential side wall of the sealed bearing seat corresponding to the cavity; and an induction plate is correspondingly arranged on the rotation shaft in the cavity.
3. The pneumatic conveying feeder according to claim 1, characterized in that a pressure equalizing exhaust pipe is arranged on the middle cylinder; the pressure equalizing exhaust pipe is correspondingly arranged on a non-material flowing channel side of the discharge ports; and a check valve is arranged on a communicating pipe between the pressure equalizing exhaust pipe and an injection tank.
4. The pneumatic conveying feeder according to claim 1, characterized in that an arched guide surface is arranged on the upper surface of the upper flange.