Pneumatic conveying device

Abstract

The present invention relates to the technical field of pneumatic conveying equipment, and specifically to a pneumatic conveying device. The present invention includes: an air compressor; a feeding unit for uniform feeding; a conveying pipeline; an anti-sticking unit: used to prevent materials from adhering to the conveying pipeline; the anti-sticking unit includes: an anti-sticking part, a connecting pipe for supplying air to the anti-sticking part; the anti-sticking part includes: a knocking block for knocking the conveying pipeline, a shell slidably connected to the knocking block, and a reset part for driving the knocking block to reset after knocking; the present invention has the following beneficial effects: the present invention can use the air in the conveying pipeline to drive the knocking block to knock the conveying pipeline by setting an anti-sticking part to avoid material adhesion, thereby avoiding the effect of material adhesion to the conveying pipeline while conveying the material.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic conveying equipment, and in particular to a pneumatic conveying device. Background Art

[0002] Pneumatic conveying device is a device that uses gas as a conveying medium to transport solid particles or powders from one location to another. This device includes a pipeline system and a source of compressed air or other gas. By controlling the flow of gas, solid particles or powders can be transported along the pipeline to the target location. Pneumatic conveying devices are usually simple, efficient, and flexible, and therefore have been widely used in industrial production.

[0003] The invention patent with application number CN202310844922.X discloses a pneumatic conveying equipment, including a discharge barrel, a first conveying pipe, a drying bin and a second conveying pipe. The bottom of the discharge barrel is connected to the discharge adjustment bin, and an adjusting roller is arranged in the discharge adjustment bin. The shaft of the adjusting roller is rotatably connected to the inner wall of the discharge adjustment bin, and a dividing plate is installed on the adjusting roller. The dividing plates are arranged in a circular array along the center of the adjusting roller. A cross bar is installed at the end of the dividing plate, and end balls are rollingly connected to the cross bar. The bottom of the discharge adjustment bin is connected to the top of the discharge pipe, and the bottom end of the discharge pipe is connected to the first conveying pipe, which is perpendicular to the first conveying pipe, one end of the first conveying pipe is connected to a Roots blower, and the other end of the first conveying pipe is connected to the drying bin, and the other end of the drying bin is connected to the second The conveying pipeline is connected, and a choke valve is installed at the connection between the second conveying pipeline and the drying bin. The second conveying pipeline is composed of multiple groups of straight pipe sections and curved pipe sections connected to each other. An insulating sleeve is installed on the curved pipe section, and an electric heating wire is installed at the connection between the insulating sleeve and the curved pipe section. A silicone rubber elastomer is installed on the inner wall of the curved pipe section, and the silicone rubber elastomer is distributed on the side with a larger bending radius of the curved pipe section. The above invention belongs to the field of pneumatic conveying technology. The silicone rubber elastomer inside the curved pipe section, after colliding with the material, uses its own elasticity to eject the material to reduce the kinetic energy loss of the material. At the same time, when the curved pipe section is blocked, the inner diameter of the pipeline is expanded after the pipeline is heated, increasing the flow space of the material, and the silicone rubber elastomer expands due to heat, squeezes the material, destroys the stable structure of the accumulated material, and is beneficial to pipeline dredging.

[0004] However, during long-term use of this patent, materials may accumulate between adjacent silicone rubber elastomers, which may affect the cleaning effect.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the invention

[0006] The purpose of the present invention is to provide a pneumatic conveying device which can effectively solve the above technical problems.

[0007] In order to achieve the purpose of the present invention, the following technical scheme is adopted:

[0008] A pneumatic conveying device, comprising: an air compressor; a feeding unit for uniformly feeding materials; a conveying pipeline; an anti-sticking unit for preventing materials from sticking to the conveying pipeline;

[0009] The anti-sticking unit comprises: an anti-sticking piece and a connecting pipe for supplying air to the anti-sticking piece;

[0010] The anti-sticking member includes: a knocking block for knocking the conveying pipe, a shell slidably connected to the knocking block, and a reset member for driving the knocking block to reset after knocking;

[0011] The two ends of the connecting pipe are respectively connected with the conveying pipeline and the shell; a pressure relief hole is opened on the side wall of the shell near one end of the conveying pipeline; the pressure relief hole is located on the knocking stroke of the knocking block.

[0012] Furthermore, the pressure relief hole is connected to a one-way valve, the air outlet end of the one-way valve is connected to an air bag, and the air outlet end of the air bag is equipped with a pressure groove.

[0013] Furthermore, a pressure relief member is installed between the gas outlet end of the pressure tank and the delivery pipeline;

[0014] The pressure relief component includes: a mounting groove installed at the air outlet end of the airbag, a blocking plate hinged in the mounting groove, and a reset spring 1 for driving the blocking plate to reset.

[0015] Furthermore, a flexible sealing sheet is provided between the mounting groove and the blocking plate.

[0016] Furthermore, there are two airbags, which are connected in sequence.

[0017] Furthermore, the air inlet end of the connecting pipe is connected to a guide, and the guide is installed on the outer wall of the conveying pipeline;

[0018] A cylindrical filter screen is slidably installed in the guide member;

[0019] The bottom of the cylindrical filter screen is connected with a connecting rod, and the other end of the connecting rod is connected with the bottom of the knocking block;

[0020] The bottom of the cylindrical filter screen is also connected to a second return spring;

[0021] A cleaning brush for cleaning the cylindrical filter screen is also installed at the end of the guide member.

[0022] Furthermore, a limiting groove for limiting the swing amplitude of the blocking plate is provided on the inner wall of the pressure groove.

[0023] Furthermore, the baffle plates are in two pieces, and are installed on both sides of the pressure tank in sequence and against each other.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention can use the air in the conveying pipeline to drive the knocking block to knock the conveying pipeline by setting an anti-sticking part to avoid material adhesion, thereby avoiding the effect of material adhesion on the conveying pipeline while conveying the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the axial side of the present invention;

[0028] Figure 3 It is a schematic diagram of the planar structure of the present invention;

[0029] Figure 4 Schematic diagram of the internal structure of the anti-adhesion unit of the present invention;

[0030] Figure 5 for Figure 4 A partial enlarged view of part A;

[0031] Figure 6 for Figure 4 A partial enlarged view of part B;

[0032] Figure 7 for Figure 6 A partial enlarged view of part D in the middle;

[0033] Figure 8 for Figure 4 A partial enlarged view of part C in the middle;

[0034] Fig. 9 This is a partial schematic diagram of the bending section of the conveying pipeline.

[0035] In the figure: 1. air compressor; 2. feeding unit; 3. separation unit; 4. unloading bin; 5. anti-sticking unit; 6. conveying pipeline; 21. hopper; 22. feeder; 51. connecting pipe; 52. anti-sticking member; 521. shell; 522. knocking block; 523. reset member; 524. pressure relief hole; 525. pressure groove; 526. one-way valve; 5251. installation groove; 5252. baffle plate; 5253. reset spring 1; 5254. flexible sealing sheet; 5255. limit groove; 527. guide member; 5271. cylindrical filter screen; 5272. connecting rod; 5273. reset spring 2; 5274. cleaning brush; 528. air bag; 61. straight section; 62. bending section; 621. connecting part; 622. sliding part; 623. extension part. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments.

[0037] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0038] like Figures 1 to 9 As shown, the present invention is a pneumatic conveying device, comprising: an air compressor 1, used for providing the airflow required for pneumatic conveying; a conveying pipeline 6; a feeding unit 2: used for continuously and evenly feeding materials into the conveying pipeline 6; a separation unit 3: used for separating materials and dust in the airflow to ensure that the discharged gas is clean; a lower silo 4: used for receiving and storing the conveyed materials; an anti-sticking unit 5: used to prevent the materials from sticking to the pipe wall of the conveying pipeline 6.

[0039] The feeding unit 2 comprises: a hopper 21 , and a feeder 22 for feeding materials to a feeding end of the hopper 21 . The discharging end of the hopper 21 is connected to a conveying pipeline 6 .

[0040] The separation unit 3 includes: a cyclone separator and a bag dust collector. The airflow containing materials and dust enters the inlet of the cyclone separator. The airflow rotates in the tangential direction in the cyclone separator, generating a strong centrifugal force. Under the action of the centrifugal force, the materials and dust with higher density are thrown to the wall of the device and fall along the wall to the collection bin. The separated gas is discharged from the central pipe of the cyclone separator and enters the bag dust collector. The cyclone separator mainly processes most of the dust and materials to reduce the load of the bag dust collector. The gas from the cyclone separator enters the air inlet of the bag dust collector. The gas passes through the filter bag, and the dust is trapped on the surface of the filter bag. The clean gas passes through the filter bag and enters the exhaust duct. As the dust on the surface of the filter bag accumulates, the dust collector will regularly remove the dust on the surface of the filter bag by vibration or back-blowing airflow to maintain the filtering effect of the filter bag. The gas discharged from the cyclone separator still contains some fine dust particles. These gases enter the bag dust collector and are finely filtered by the filter bags. The fine dust is trapped on the surface of the filter bags, ensuring that the exhausted gases meet environmental protection requirements.

[0041] The discharge end of the cyclone separator is communicated with the feed end of the lower silo 4 for conveying the material into the lower silo 4 .

[0042] The conveying pipeline 6 consists of a straight section 61 and a bending section 62 connected to each other; the bending section 62 consists of a connecting portion 621 fixedly connected to the straight section 61, a sliding portion 622 slidably connected to the connecting portion 621, and an extending portion 623 protruding toward the anti-sticking unit 5; wherein the position of the sliding portion 622 is preferably a position where materials are more easily accumulated.

[0043] The anti-sticking unit 5 includes: a connecting pipe 51 connected to the conveying pipeline 6, an anti-sticking member 52 connected to the air outlet of the connecting pipe 51; and a connecting portion 621 of the air inlet end of the connecting pipe 51 connected to the bending section 62 or the straight section 61.

[0044] The anti-adhesive member 52 includes: a shell 521 fixedly mounted on the outer wall of one side of the conveying pipe 6, the air inlet end of the shell 521 is connected to the air outlet end of the connecting pipe 51; a knocking block 522 slidably mounted on the inner wall of the shell 521, the knocking block 522 is used to knock the conveying pipe 6; a reset member 523 is installed between the knocking block 522 and the shell 521; a pressure relief hole 524 is opened on the side wall of the shell 521 near one end of the conveying pipe 6; the pressure relief hole 524 is located on the knocking stroke of the knocking block 522, and is used to make the air in the shell 521 flow out through the pressure relief hole 524 when the knocking block 522 slides through the pressure relief hole 524, thereby playing a pressure relief role. The knocking end of the knocking block 522 is coated with an elastic material to prevent the knocking block 522 from hard contact with the conveying pipe 6 and damage to the conveying pipe 6; the reset member 523 is preferably a spring, an elastic rope, etc.

[0045] By setting the anti-sticking member 52, the air in the conveying pipe 6 can be used to drive the knocking block 522 to knock the conveying pipe 6 to avoid material adhesion, thereby achieving the technical effect of preventing the material from sticking to the conveying pipe 6 while conveying the material.

[0046] A guide 527 is sleeved on the outer wall of the end of the connecting pipe 51 connected to the conveying pipe 6, and the guide 527 is installed on the outer wall of the straight section 61 or the connecting part 621 of the conveying pipe 6. A cylindrical guide groove is provided in the guide 527, and a cylindrical filter 5271 is slidably installed in the guide groove; a return spring 2 5273 is connected to the bottom of the cylindrical filter 5271; a cleaning brush 5274 is also installed at one end of the guide groove close to the conveying pipe 6; the cleaning brush 5274 is used to clean impurities on the surface of the cylindrical filter 5271 when the cylindrical filter 5271 slides; a connecting rod 5272 is connected to the bottom of the knocking block 522, and the connecting rod 5272 is U-shaped, and the other end of the connecting rod 5272 is located on one side of the cylindrical filter 5271, and when the knocking block 522 slides, it contacts the cylindrical filter 5271 and pushes the cylindrical filter 5271 toward the conveying pipe 6.

[0047] When the knocking block 522 slides in the knocking direction, it drives the connecting rod 5272 to move synchronously. During the movement, the connecting rod 5272 abuts against and drives the cylindrical filter screen 5271 to slide along the guide groove. When the knocking block 522 passes through the pressure relief hole 524, the pressure relief hole 524 releases pressure, and the pressure in the outer shell 521 is reduced. Then, under the action of the reset member 523 and the reset spring 2 5273, the knocking block 522 is driven to reset. At the same time, the reset spring 2 5273 also drives the cylindrical filter screen 5271 to reset. During the resetting process of the cylindrical filter screen 5271, it passes through the cleaning brush 5274. The cleaning brush 5274 cleans the dust on the surface of the cylindrical filter screen 5271 to prevent dust from entering the outer shell 521 through the connecting pipe 51.

[0048] During the actual installation process, if the elastic force of the selected reset spring 5273 is sufficient to drive the cylindrical filter 5271 and the knocking block 522 to reset at the same time, you can also choose not to install the reset member 523; at the same time, in order to make the connecting rod 5272 slide smoothly, a guide groove can be opened on the inner wall of the outer shell 521, and a slider adapted to the guide groove can be installed on the connecting rod 5272, so that the slider is slidably connected to the guide groove, so as to guide and limit the connecting rod 5272.

[0049] The outlet end of the pressure relief hole 524 is connected to a one-way valve 526, and the outlet end of the one-way valve 526 is connected to an air bag 528; a pressure groove 525 is installed at the outlet end of the air bag 528, the air inlet end of the pressure groove 525 is located inside the air bag 528, and a pressure relief part is installed at the outlet end of the pressure groove 525.

[0050] The pressure relief component includes: a mounting groove 5251 fixedly mounted on the air outlet end of the airbag 528, and a baffle plate 5252 hinged in the mounting groove 5251, wherein the baffle plate 5252 is used to block the gas in the pressure groove 525 from being discharged into the air; a return spring 5253 is fixedly mounted on the side wall on the air inlet side of the mounting groove 5251, and the other end of the return spring 5253 is connected to the air inlet side of the baffle plate 5252, so as to reset the baffle plate 5252.

[0051] In this embodiment, there are preferably two airbags 528, the outlet end of the front airbag 528 is connected to the inlet end of the rear airbag 528, and the inlet end of the front airbag 528 is connected to the one-way valve 526; when the gas in the shell 521 is discharged to the front airbag 528 through the pressure relief hole 524, the front airbag 528 expands rapidly, and when the air pressure in the front airbag 528 exceeds the bearing threshold of the pressure relief component, the rear airbag 528 is exhausted; the spring force in the pressure relief component installed in the front airbag 528 is different from the spring force in the pressure relief component installed in the rear airbag 528, so that the exhaust frequency of the front airbag 528 and the rear airbag 528 through the pressure relief component is different, and then the size of the front airbag 528 and the rear airbag 528 is intermittently expanded and reduced, thereby intermittently squeezing the conveying pipe 6, thereby further reducing the adhesion of materials on the inner wall of the conveying pipe 6.

[0052] As an optional solution, electromagnet 1 is fixedly installed at the end of the baffle plate 5252, and electromagnet 2 is installed at a position matching the baffle plate 5252 on the side wall of the limit groove 5255; electromagnet 1 and electromagnet 2 are magnetically connected to cooperate with the spring to further enhance the stability of the baffle plate 5252; a pressure sensor for detecting the internal pressure of the pressure groove 525 is also installed on the air intake side of the pressure groove 525, and the pressure sensor is electrically connected to the PLC controller; the pressure sensor is used to monitor the pressure in real time, and when the pressure inside the pressure groove 525 exceeds the threshold, the PLC controller controls the disconnection of the power supply of electromagnet 1 and electromagnet 2; after the disconnection for a predetermined time, or when the pressure in the pressure groove 525 is lower than the threshold, the PLC controller controls the power supply of electromagnet 1 and electromagnet 2 to be turned on; the predetermined time is generally set to 1-3 seconds; the setting of the electromagnet can better control the opening and closing time of the baffle plate 5252.

[0053] A flexible sealing sheet 5254 is connected to the opening of the mounting groove 5251 , and the flexible sealing sheet 5254 is connected to the blocking plate 5252 to prevent air from flowing out of the gap between the blocking plate 5252 and the mounting groove 5251 ; the flexible sealing sheet 5254 is preferably made of rubber material.

[0054] When conveying materials, the gas in the conveying pipe 6 is blown from the feeding end to the feeding end, so that the granular materials can be conveyed; on the other hand, the air in the conveying pipe 6 flows into the shell 521 of the anti-sticking member 52 through the connecting pipe 51. At this time, the pressure in the shell 521 increases, forcing the knocking block 522 to slide in the direction of the conveying pipe 6 and knock on the outer wall of the conveying pipe 6. During the sliding process of the knocking block 522, the air passes through the pressure relief hole 524, and the pressure in the shell 521 decreases. Then the reset member 523 drives the knocking block 522 to reset. The knocking block 522 is intermittently driven by the gas in the conveying pipe 6 to knock on the conveying pipe 6, so that the conveying pipe 6 produces slight vibration, and at the same time, the granular materials adhering to the inner wall of the conveying pipe 6 can be knocked off. During the knocking process, the air in the shell 521 is intermittently discharged to the front airbag 528 through the pressure relief hole 524, the gas inside the front airbag 528 is discharged to the rear airbag 528 through the pressure groove 525, and the gas in the rear airbag 528 is discharged to the air through the pressure groove 525. Due to the function of the one-way valve 526, the air in the airbag 528 cannot flow back to the shell 521. As the amount of air in the airbag 528 increases, the airbag 528 expands and squeezes the bent section 62 of the conveying pipe 6. The sliding portion 622 is moved to make the sliding portion 622 swing; when the pressure in the airbag 528 exceeds the threshold value that the baffle plate 5252 can withstand, the air in the front airbag 528 flows to the rear airbag 528 through the baffle plate 5252, and the rear airbag 528 expands rapidly; when the pressure inside the rear airbag 528 exceeds the threshold value, the baffle plate 5252 opens the air in the airbag 528 and flows into the air; due to the setting of the cylindrical filter, the gas with impurities can be prevented from flowing into the air.

[0055] By connecting the outer shell 521 with the conveying pipe 6, the conveying pipe 6 can be knocked while the material is being conveyed. At the same time, the sliding portion 622 of the bending section 62 can be deformed, which plays a good anti-sticking and cleaning role and avoids the problem of easy blockage of the bending section 62 of the conveying pipe 6; reducing material adhesion can ensure the continuous and stable operation of the pneumatic conveying system, avoid shutdown and maintenance caused by pipeline blockage, and thus improve the overall conveying efficiency and production efficiency; the design of the cylindrical filter net in the present application can prevent the material from being blown into the shell or the airbag 528, affecting the normal operation of the shell or the airbag 528; it can also prevent the material from being discharged into the air through the airbag 528 and polluting the air.

[0056] Preferably, the blocking plate 5252 is composed of a sealing end hinged to the plate body, the sealing pressure groove 525, and a movable end connected to the return spring 5253.

[0057] Preferably, a limiting groove 5255 for limiting the swing amplitude of the blocking plate 5252 is provided on the inner wall of the pressure groove 525 to prevent the blocking plate 5252 from swinging too much.

[0058] Preferably, the blocking plates 5252 are in two pieces, and are installed on both sides of the pressure groove 525 in sequence and against each other.

[0059] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0060] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A pneumatic conveying device, characterized in that: include: An air compressor (1); a feeding unit (2) for uniformly feeding materials; a conveying pipeline (6); an anti-sticking unit (5) for preventing materials from sticking to the conveying pipeline (6); The anti-sticking unit (5) comprises: an anti-sticking member (52) and a connecting pipe (51) for supplying air to the anti-sticking member (52); The anti-sticking member (52) comprises: a knocking block (522) for knocking the conveying pipe (6), a housing (521) slidably connected to the knocking block (522), and a restoring member (523) for driving the knocking block (522) to return to its original position after the knocking; The two ends of the connecting pipe (51) are respectively connected to the conveying pipe (6) and the outer shell (521); a pressure relief hole (524) is provided on the side wall of the outer shell (521) near one end of the conveying pipe (6); the pressure relief hole (524) is located on the striking stroke of the striking block (522); The pressure relief hole (524) is connected to a one-way valve (526), ​​the outlet end of the one-way valve (526) is connected to an air bag (528), and the outlet end of the air bag (528) is installed with a pressure groove (525); A pressure relief member is installed between the gas outlet end of the pressure tank (525) and the delivery pipeline (6); The pressure relief component comprises: a mounting groove (5251) mounted on the air outlet end of the airbag (528), a baffle plate (5252) hinged in the mounting groove (5251), and a return spring (5253) for driving the baffle plate (5252) to return to its original position; A flexible sealing sheet (5254) is provided between the mounting groove (5251) and the blocking plate (5252); There are two air bags (528), which are connected in sequence; The conveying pipeline (6) is composed of a straight section (61) and a bent section (62) connected to each other; the bent section (62) is composed of a connecting portion (621) fixedly connected to the straight section (61), a sliding portion (622) slidably connected to the connecting portion (621), and an extending portion (623) protruding in the direction of the anti-sticking unit (5); wherein the sliding portion (622) is located at a position where materials are easily accumulated; The air outlet of the front airbag (528) is connected to the air inlet of the rear airbag (528), and the air inlet of the front airbag (528) is connected to the one-way valve (526); when the gas in the housing (521) is discharged to the front airbag (528) through the pressure relief hole (524), the front airbag (528) expands rapidly. When the air pressure in the front airbag (528) exceeds the tolerance threshold of the pressure relief component, the air is discharged to the rear airbag (528); the spring force of the pressure relief component installed in the front airbag (528) and the pressure relief component installed in the rear airbag (528) are connected to the one-way valve (526); 8) The spring forces in the pressure relief member installed inside are different, so that the exhaust frequencies of the front airbag (528) and the rear airbag (528) through the pressure relief member are different, thereby causing the sizes of the front airbag (528) and the rear airbag (528) to expand and shrink intermittently, thereby intermittently squeezing the conveying pipe (6), thereby further reducing the adhesion of materials on the inner wall of the conveying pipe (6); the airbag (528) expands and squeezes the sliding portion (622) of the bending section (62) of the conveying pipe (6), causing the sliding portion (622) to swing.

2. A pneumatic conveying device as claimed in claim 1, characterized in that: The air inlet end of the connecting pipe (51) is connected to a guide member (527), and the guide member (527) is installed on the outer wall of the conveying pipe (6); A cylindrical filter screen (5271) is slidably mounted in the guide member (527); The bottom of the cylindrical filter screen (5271) is connected to a connecting rod (5272), and the other end of the connecting rod (5272) is connected to the bottom of the knocking block (522); The bottom of the cylindrical filter screen (5271) is also connected to a second return spring (5273); A cleaning brush (5274) for cleaning the cylindrical filter screen (5271) is also installed at the end of the guide member (527).

3. A pneumatic conveying device as claimed in claim 1, characterized in that: A limiting groove (5255) for limiting the swing amplitude of the blocking plate (5252) is provided on the inner wall of the pressure groove (525).

4. A pneumatic conveying device as claimed in claim 1, characterized in that: The baffle plates (5252) are in two pieces, and are installed on both sides of the pressure groove (525) in sequence and against each other.

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