Full-automatic packaging system for bamboo fiber modified particles

Abstract

The full-automatic packaging system comprises a material storage box and a particle filling air cylinder, a V-shaped particle guide plate is arranged on the lower portion of an inner cavity of the material storage box, a bottom opening of the particle guide plate forms a particle guide outlet, a vertically-downward particle guide barrel is fixed to the bottom of the particle guide outlet, and a particle filling hopper is arranged on the lower portion of the particle guide barrel. A square-frame-shaped sleeve is arranged at the upper part of the granule filling hopper and sleeves the granule guide cylinder, a piston rod of a granule filling cylinder is connected with a fixed plate on the outer side wall of one side of the sleeve, and a cylinder body of the granule filling cylinder is upwards connected with the bottom of the granule guide plate; a guide plate is arranged on the other side of the sleeve, a vertically-downward guide column is arranged at the bottom of the particle guide plate, and the lower portion of the guide column penetrates through the guide plate to form a guide end; two sides of the lower part of the granule filling hopper are gradually shrunk to form a V shape and are sealed, two sides of the bottom of the granule filling hopper are gradually shrunk to form inclined surfaces, granule outlets which are through inside and outside are formed in the lower parts of the inclined surfaces, a limiting cylinder is arranged in an inner cavity of the sleeve and is connected with the inner cavity wall of the sleeve through a supporting rod, and a sealing cover which protrudes upwards is arranged at the top of the limiting cylinder; a bag filling positioning unit is arranged on the material storage box below the grain filling hopper, a transfer conveying unit is arranged below the bag filling positioning unit, and a packaging bag conveying unit is arranged on the ground on one side below the material storage box. After the scheme is adopted, the functions of packaging bag conveying, grain loading, transferring and the like can be integrated, the structure is reasonable, and the using effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging production, in particular to a fully automatic packaging system for modified bamboo fiber particles. Background Art

[0002] Modified bamboo fiber pellets are granular materials made by physically, chemically, or biologically modifying bamboo fibers. These materials combine the natural properties of bamboo fiber (such as biodegradability, renewability, and high strength) with the functional properties of modified bamboo fiber (such as enhanced interfacial compatibility, heat resistance, and hydrophobicity). They are widely used in environmentally friendly materials, composite materials, packaging, textiles, bio-based plastics, and disposable tableware. After the bamboo fiber modified material is formed into particles, it needs to be packaged, transported and sold. Waterproof and moisture-proof packaging bags (with tin foil or fireproof layer on the inner layer) are used. When packaging the existing bamboo fiber modified particles, after the robot sends the bag mouth to the bottom of the filling hopper and clamps it, the air nozzle fixed at the bottom of the filling hopper blows air downward to blow open the bag mouth, and then pouring is carried out. However, since the filling hopper is fixed, there will be a gap between its bottom and the bag mouth, causing the particles to leak from the gap. At the same time, since the bottom of the bag is suspended during pouring, it needs to be manually lifted after pouring, and then the packed bag is placed on the conveyor belt to enter the sealing machine. This method is cumbersome to operate and is easy to fall after filling, causing the bag to tip over. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a fully automatic packaging system for modified bamboo fiber particles with a reasonable structure and good use effect.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is as follows: a fully automatic packaging system for modified bamboo fiber particles, which includes a storage box and a particle filling cylinder, wherein a V-shaped particle guide plate is provided at the lower part of the inner cavity of the storage box, the bottom opening of the particle guide plate forms a particle guide outlet, a vertical downward particle guide cylinder is fixed to the bottom of the particle guide outlet, a particle filling hopper is provided at the lower part of the particle guide cylinder, a square frame-shaped sleeve is formed on the upper part of the particle filling hopper, the sleeve is sleeved on the outside of the particle guide cylinder, the piston rod of the particle filling cylinder is connected to the fixed plate on the outer side wall of one side of the sleeve, and the cylinder body of the particle filling cylinder is connected to the bottom of the particle guide plate upward; a guide is provided on the other side of the sleeve The bottom of the grain guide plate is provided with a vertical downward guide column, and the lower part of the guide column passes through the guide plate to form a guide end; the two sides of the lower part of the grain filling hopper gradually shrink to form a V shape and are sealed, and the two sides of the bottom of the grain filling hopper gradually shrink to form an inclined surface, and the lower part of the inclined surface is provided with a grain outlet that passes through the inside and outside, and the inner cavity of the sleeve is provided with a limiting cylinder, which is connected to the inner cavity wall of the sleeve by a support rod, and the top of the limiting cylinder is provided with an upwardly protruding sealing cover; a bag filling positioning unit is provided on the storage box below the grain filling hopper, a transfer conveying unit is provided below the bag filling positioning unit, and a packaging bag conveying unit is provided on the ground on one side below the storage box.

[0005] The bag filling positioning unit includes a first bag clamping arm and a second bag clamping arm, wherein the tops of the first bag clamping arm and the second bag clamping arm are respectively hinged on the storage boxes on both sides of the grain filling hopper, the bottom of the first bag clamping arm is connected to one end of the top of the first bag clamping plate, and the bottom of the second bag clamping arm is connected to one end of the top of the second bag clamping plate; the other ends of the first bag clamping plate and the second bag clamping plate are relatively formed into a bag clamping end, and the bag clamping ends are both equipped with bag clamping pads, and a bag opening support rod is installed at the bottom of the second bag clamping plate, and the bag opening support rod is parallel to the second bag clamping plate, and a bag opening suction nozzle is installed on the bag opening support rod, and a synchronous cylinder is movably connected between the first bag clamping plate and the second bag clamping plate.

[0006] The transfer conveying unit includes a transfer guide rail installed on the ground below the grain filling hopper, a transfer seat movably installed on the transfer guide rail, and the transfer seat is driven by corresponding power to move on the transfer guide rail, a support column is vertically installed on one side of the transfer seat, a conveyor belt supporting arm is installed on the lower part of the support column above the transfer seat, a vertically upward conveyor belt supporting cylinder is installed on the conveyor belt supporting arm, the piston rod of the conveyor belt supporting cylinder is upwardly connected to the conveyor belt supporting bracket, and the transfer conveyor belt is installed on the conveyor belt supporting bracket; a vertically upward adjusting cylinder is installed in the support column, one side of the bag clamping support plate is connected to the adjusting cylinder, and the other side of the bag clamping support plate is suspended directly above the transfer conveyor belt, and bag clamping units are installed at both ends of the suspended side.

[0007] The packaging bag conveying unit includes a bag placing rack installed on one side of the transfer guide rail, and a bag body stacking plate is provided on the top of the bag placing rack; a side support rack is vertically fixed to the rear side of the top of the bag placing rack, one end of the support arm is connected to the top of the side support rack, and the other end is suspended above the bag body stacking plate, and its suspended end is movably hinged with a bag feeding cylinder, and a negative pressure bag suction plate is installed at the piston rod of the bag feeding cylinder, and the negative pressure bag suction plate is connected to an external exhaust fan, and a steering assembly is provided at the hinge of the support arm and the bag feeding cylinder; a bag pressing assembly is provided at the lower part of the side support rack.

[0008] A cylinder groove is reserved between the limiting cylinder and the sleeve, the lower part of the particle guide cylinder is embedded in the cylinder groove, the outer wall of the limiting cylinder contacts the inner wall of the particle guide cylinder, and the horizontal plane height of the top of the limiting cylinder is lower than the horizontal plane height of the top of the sleeve.

[0009] After adopting the above scheme, the present invention sends the packaging bag to the bag filling positioning unit through the packaging bag conveying unit, clamps the two sides of the bag opening of the packaging bag through the bag filling positioning unit, and the filling cylinder drives the filling hopper to descend and insert into the bag opening of the packaging bag to fill the packaging bag. During the filling, the transfer conveying unit clamps the two sides of the upper part of the packaging bag. After the bag filling is completed, the transfer conveying unit sends the bag to the sealing machine for sealing. The structure after adopting this scheme is reasonable and the use effect is good, and continuous automatic packaging can be achieved under the control of the external system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0011] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0012] Figure 3 It is a front view of the grain filling hopper of the present invention.

[0013] Figure 4 It is a front view of the grain filling hopper of the present invention.

[0014] Figure 5 It is a schematic diagram of the bag clamping unit of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with all the accompanying drawings. The preferred embodiments of the present invention are as follows: Figure 1 To the attached Figure 5 The embodiment of the present invention is a fully automatic packaging system for modified bamboo fiber particles, which includes a storage box 1 and a particle filling cylinder 8. The lower part of the inner cavity of the storage box 1 is provided with a V-shaped particle guide plate 2, the bottom opening of the particle guide plate 2 forms a particle guide outlet, and a vertical downward particle guide cylinder 3 is fixed to the bottom of the particle guide outlet. A particle filling hopper 4 is provided at the lower part of the particle guide cylinder 3, and a square-shaped sleeve is formed on the upper part of the particle filling hopper 4. The sleeve is sleeved on the outside of the particle guide cylinder 3, and the piston rod of the particle filling cylinder 8 is connected to the fixed plate on the outer side wall of one side of the sleeve, and the cylinder body of the particle filling cylinder 8 is connected to the bottom of the particle guide plate 2 upward; a guide plate is provided on the other side of the sleeve, and the particle guide A vertical downward guide column is provided at the bottom of the plate 2, and the lower part of the guide column passes through the guide plate to form a guide end; the two sides of the lower part of the grain filling hopper 4 gradually shrink to form a V shape and seal, and the two sides of the bottom of the grain filling hopper 4 gradually shrink to form an inclined surface, and a grain outlet 5 is provided at the lower part of the inclined surface, which passes through the inside and outside, and a limiting cylinder 6 is provided in the inner cavity of the sleeve, and the limiting cylinder 6 is connected to the inner cavity wall of the sleeve by a support rod, and a sealing cover 7 protruding upward is provided on the top of the limiting cylinder 6; a bag filling positioning unit is provided on the storage box 1 below the grain filling hopper 4, a transfer conveying unit is provided below the bag filling positioning unit, and a packaging bag conveying unit is provided on the ground on one side below the storage box 1.

[0016] The bag filling positioning unit includes a first bag clamping arm 201 and a second bag clamping arm 202, wherein the tops of the first bag clamping arm 201 and the second bag clamping arm 202 are respectively hinged on the storage box 1 on both sides of the grain filling hopper 4, the bottom of the first bag clamping arm 201 is connected to one end of the top of the first bag clamping plate 203, and the bottom of the second bag clamping arm 202 is connected to one end of the top of the second bag clamping plate 204; the other ends of the first bag clamping plate 203 and the second bag clamping plate 204 are relatively formed into a bag clamping end, and the bag clamping ends are both equipped with bag clamping pads 207, and a bag opening support rod 208 is installed at the bottom of the second bag clamping plate 204, and the bag opening support rod 208 is parallel to the second bag clamping plate 204, and a bag opening nozzle 209 is installed on the bag opening support rod 208, and a synchronous cylinder 210 is movably connected between the first bag clamping plate 203 and the second bag clamping plate 204. The transfer conveying unit includes a transfer guide rail 303 installed on the ground below the filling hopper 4, and a transfer seat 301 is movably installed on the transfer guide rail 303. The transfer seat 301 is driven by corresponding power to walk on the transfer guide rail 303. A support column 302 is vertically installed on one side of the transfer seat 301, and a conveyor belt supporting arm 306 is installed at the lower part of the support column 302 above the transfer seat 301. A vertically upward conveyor belt supporting cylinder 307 is installed on the conveyor belt supporting arm 306, and the piston rod of the conveyor belt supporting cylinder 307 is upwardly connected to the conveyor belt supporting bracket, and a transfer conveyor belt 308 is installed on the conveyor belt supporting bracket; a vertically upward adjusting cylinder 304 is installed in the support column 302, one side of the bag clamping support plate 305 is connected to the adjusting cylinder 304, and the other side of the bag clamping support plate 305 is suspended just above the transfer conveyor belt 308, and both ends of its suspended side are equipped with bag clamping units.

[0017] The bag conveying unit includes a bag placement rack 101 mounted on one side of the transfer guide rail 303. A bag stacking plate 105 is located on top of the rack 101. A side support frame 102 is vertically fixed to the rear of the top of the rack 101. A support arm 103 is connected to the top of the side support frame 102 at one end and suspended above the bag stacking plate 105 at the other end. A bag delivery cylinder 104 is movably hinged to its suspended end. A negative pressure bag suction plate 108 is attached to the piston rod of the bag delivery cylinder 104, which is connected to an external exhaust fan. A steering assembly is located at the hinge between the support arm 103 and the bag delivery cylinder 104. A bag pressing assembly is located at the bottom of the side support frame 102. A groove is reserved between the stopper cylinder 6 and the sleeve. The lower portion of the grain guide cylinder 3 is embedded in the groove. The outer wall of the stopper cylinder 6 contacts the inner wall of the grain guide cylinder 3, and the top of the stopper cylinder 6 is lower than the top of the sleeve. There are two groups of bag clamping units, which are respectively installed on the end of the side walls on both sides of the bag clamping support plate 305; the installed bag clamping units are respectively located at both ends of the conveying direction of the transfer conveyor belt 308; the bag clamping unit includes a fixed splint 309, a movable splint 310, and a splint motor 311, wherein the fixed splint 309 is fixed to the end of the U-shaped side wall of the bag clamping support plate 305, and the splint motor 311 is installed at the bottom of the U-shaped side wall of the fixed splint 309, and the transmission shaft of the splint motor 311 passes through the fixed splint 309 upward and is connected to the movable splint 310, and the movable splint 310 is L-shaped when viewed from above, and its vertical arm is connected to the transmission shaft, and a clamping area is formed between the horizontal arm and the fixed splint.

[0018] The steering assembly includes a steering motor 106 and a steering gear 107, wherein a cylinder plate is fixed to the end of the cylinder body of the bag feeding cylinder 104, and the cylinder plate is hinged to the support arm 103 through a cylinder hinge shaft 109. A steering gear 107 is provided on the cylinder plate, and the center line of the steering gear 107 is located on the same straight line as the center line of the cylinder hinge shaft 109. The steering motor 106 is installed on the top of the support arm 103, and a driving gear 108 is installed on the transmission shaft of the steering motor 106, and the driving gear 108 is engaged with the steering gear 107. The bag pressing assembly includes a bag pressing arm 111, a bag pressing wheel 112, a push arm spring 113, and a bag pressing support plate 114, wherein the bag pressing support plate 114 is vertically fixed on the bag placing rack 101 on one side of the side support rack 102, and the middle part of the bag pressing arm 111 is hinged to the upper part of the bag pressing support plate 114 through the bag pressing pin shaft. After the hinge, one end of the bag pressing arm 111 extends to above the bag body stacking plate 105, and the extended end is installed with the bag pressing wheel 112, and a push arm spring 113 is installed between the bottom of the other end of the bag pressing arm 111 and the bag placing rack 101.

[0019] After adopting the above solution, the packaging bags are stacked on the bag body stacking plate in sequence. Under the elastic force of the push arm spring, the bag pressing arm equipped with the bag pressing wheel is turned downward, so that the bag pressing wheel presses on the surface of the top layer of packaging bags to prevent the packaging bags from being scattered. When sucking bags, the steering motor rotates through the transmission shaft to drive the driving gear to rotate, the driving gear synchronously drives the steering gear to rotate, and the steering gear synchronously drives the cylinder hinge shaft to drive the bag feeding cylinder to rotate downward, so that the negative pressure bag suction plate moves to the top of the packaging bag; The piston rod of the bag feeding cylinder extends, driving the negative pressure bag suction plate downward to contact the top layer of packaging bags. The external exhaust fan sucks air and sucks the top layer of packaging bags through the negative pressure bag suction plate (negative pressure air nozzle); The piston rod of the bag feeding cylinder contracts, driving the negative pressure bag suction plate upward, so that the top layer of packaging bags leave the bag body stacking plate; the steering motor rotates through the transmission shaft to drive the driving gear to rotate in the opposite direction, and the driving gear synchronously drives the steering gear to rotate, and the steering gear synchronously drives the cylinder hinge shaft to drive the bag feeding cylinder to rotate upward, and the piston rod of the bag feeding cylinder extends, driving the negative pressure bag suction plate to the bag filling positioning unit. In the original state, the piston rod of the synchronous cylinder in the bag filling and positioning unit is extended, and the bag clamping ends of the first bag clamping plate and the second bag clamping plate are relatively separated; when the bag opening of the packaging bag moves between the bag clamping ends of the first bag clamping plate and the second bag clamping plate, the piston rod of the synchronous cylinder is retracted, and the lower parts of the first bag clamping arm and the second bag clamping arm are relatively moved together through the middle hinge arm. The first bag clamping arm and the second bag clamping arm synchronously drive the first bag clamping plate and the second bag clamping plate to move together, and clamp the two ends of the bag opening of the packaging bag through the bag clamping pad; After the bag opening is clamped (the middle part of the bag is not in a tensioned state), the bag opening nozzle generates suction through an external exhaust fan to generate suction to one side of the bag opening, or bag opening nozzles are installed under the first bag clamping plate and the second bag clamping plate to generate suction respectively, so that the bag opening is smoothly opened; In its original state, the outer wall of the limiting cylinder contacts the inner wall of the grain guide cylinder, blocking the inner cavity of the grain guide cylinder. After the packaging bag moves to the bottom of the grain filling hopper, the piston rod of the grain filling cylinder extends to drive the grain filling hopper downward. Driven by the grain filling hopper, the limiting cylinder moves downward synchronously. The sealed V-shaped grain filling hopper tip facilitates the insertion of the packaging bag at the bottom of the grain filling hopper. After the packaging bag is inserted at the bottom of the grain filling hopper, the piston rod of the grain filling cylinder continues to move downward, causing the limiting cylinder to separate from the grain guide cylinder. The bamboo fiber modified granules fall from the gap between the grain guide cylinder and the sealing cover into the grain filling hopper and enter the packaging bag through the grain outlet. In its original state, the transfer conveying unit stops on the transfer guide rail below the filling hopper, with the horizontal arm of the movable splint away from the fixed splint and the vertical arm of the movable splint parallel to the fixed splint. The horizontal arm of the movable splint and the fixed splint form an "L" shape when viewed from above. The piston rod of the regulating cylinder extends to drive the movable splint and the fixed splint to be located under the corresponding bag clamping plate. After filling, the motor drive shafts of the two clamping units rotate relative to each other, driving the cross arm of the movable clamping plate to move toward the fixed clamping plate. The upper edges of the bag are clamped by the cross arm of the movable clamping plate and the fixed clamping plate. At the same time, the piston rod of the supporting cylinder extends upward, driving the transfer conveyor belt to rise and contact the bottom of the bag, lifting the bottom of the bag. After filling is complete, the filling cylinder drives the filling hopper upward to block the pellet guide tube, while the synchronous cylinder drives the first and second bag clamping plates to release the bag opening. The piston rods of the adjustment cylinder and the support cylinder move downward synchronously, lowering the bag opening below the bag clamping plates. The transfer seat, driven by the corresponding power, moves on the transfer guide rail to the sealing machine for sealing. After sealing is complete, the movable and fixed clamping plates release the bag, and the transfer conveyor belt rotates to output the packaged bamboo fiber modified pellets. This solution integrates the functions of bag conveying, pellet filling, and transfer, with a reasonable structure and excellent performance.

[0020] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any changes made based on the shape and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fully automatic packaging system for modified bamboo fiber particles, comprising a storage box (1) and a particle filling cylinder (8), wherein: A V-shaped particle guide plate (2) is provided at the lower part of the inner cavity of the storage box (1), the bottom opening of the particle guide plate (2) forms a particle guide outlet, a vertical downward particle guide cylinder (3) is fixed at the bottom of the particle guide outlet, a particle filling hopper (4) is provided at the lower part of the particle guide cylinder (3), the upper part of the particle filling hopper (4) is a square frame-shaped sleeve, the sleeve is sleeved on the outer side of the particle guide cylinder (3), the piston rod of the particle filling cylinder (8) is connected to the fixed plate on the outer side wall of one side of the sleeve, and the cylinder body of the particle filling cylinder (8) is connected to the bottom of the particle guide plate (2) upward; a guide plate is provided on the other side of the sleeve, and a vertical downward guide column is provided at the bottom of the particle guide plate (2), and the lower part of the guide column is provided. The guide end is formed by passing through the guide plate; the two sides of the lower part of the grain filling hopper (4) gradually shrink to form a V shape and seal, the two sides of the bottom of the grain filling hopper (4) gradually shrink to form an inclined surface, the lower part of the inclined surface is provided with a grain outlet (5) that passes through inside and outside, the inner cavity of the sleeve is provided with a limiting cylinder (6), the limiting cylinder (6) is connected to the inner cavity wall of the sleeve by a support rod, and the top of the limiting cylinder (6) is provided with a sealing cover (7) that protrudes upward; the storage box (1) below the grain filling hopper (4) is provided with a bag filling positioning unit, the bag filling positioning unit is provided below the transfer conveying unit, and the packaging bag conveying unit is provided on the ground on one side below the storage box (1).

2. The fully automatic packaging system for modified bamboo fiber particles according to claim 1, characterized in that: The bag filling positioning unit comprises a first bag clamping arm (201) and a second bag clamping arm (202), wherein the tops of the first bag clamping arm (201) and the second bag clamping arm (202) are respectively hinged on the storage box (1) on both sides of the grain filling hopper (4), the bottom of the first bag clamping arm (201) is connected to one end of the top of the first bag clamping plate (203), and the bottom of the second bag clamping arm (202) is connected to one end of the top of the second bag clamping plate (204); the first bag clamping plate (203 ), and the other end of the second bag clamping plate (204) is relatively formed into a bag clamping end, and the bag clamping end is installed with a bag clamping pad (207), and a bag opening support rod (208) is installed at the bottom of the second bag clamping plate (204), and the bag opening support rod (208) is parallel to the second bag clamping plate (204). A bag opening suction nozzle (209) is installed on the bag opening support rod (208), and a synchronous cylinder (210) is movably connected between the first bag clamping plate (203) and the second bag clamping plate (204).

3. The fully automatic packaging system for modified bamboo fiber particles according to claim 1, characterized in that: The transfer conveying unit includes a transfer guide rail (303) installed on the ground below the filling hopper (4), a transfer seat (301) is movably installed on the transfer guide rail (303), the transfer seat (301) is driven by a corresponding power to walk on the transfer guide rail (303), a support column (302) is vertically installed on one side of the transfer seat (301), a conveyor belt supporting arm (306) is installed at the lower part of the support column (302) above the transfer seat (301), and a vertical support column (306) is installed on the conveyor belt supporting arm (306). A conveyor belt supporting cylinder (307) is vertically upward, and the piston rod of the conveyor belt supporting cylinder (307) is connected to the conveyor belt supporting bracket upward, and a transfer conveyor belt (308) is installed on the conveyor belt supporting bracket; a vertical upward adjustment cylinder (304) is installed in the support column (302), one side of the bag clamping support plate (305) is connected to the adjustment cylinder (304), and the other side of the bag clamping support plate (305) is suspended directly above the transfer conveyor belt (308), and both ends of the suspended side are equipped with bag clamping units.

4. The fully automatic packaging system for modified bamboo fiber particles according to claim 1, characterized in that: The packaging bag conveying unit includes a bag placing rack (101) installed on one side of the transfer guide rail (303), and a bag body stacking plate (105) is provided on the top of the bag placing rack (101); a side support rack (102) is vertically fixed to the rear side of the top of the bag placing rack (101), one end of the support arm (103) is connected to the top of the side support rack (102), and the other end is suspended above the bag body stacking plate (105), and the suspended end is movably hinged to a bag feeding cylinder (104), and a negative pressure bag suction plate (108) is installed at the piston rod of the bag feeding cylinder (104), and the negative pressure bag suction plate (108) is connected to an external exhaust fan. A steering assembly is provided at the hinge of the support arm (103) and the bag feeding cylinder (104); and a bag pressing assembly is provided at the lower part of the side support rack (102).

5. The fully automatic packaging system for modified bamboo fiber particles according to claim 1, characterized in that: A cylinder groove is reserved between the limiting cylinder (6) and the sleeve, the lower part of the particle guide cylinder (3) is embedded in the cylinder groove, the outer wall of the limiting cylinder (6) contacts the inner wall of the particle guide cylinder (3), and the horizontal plane height of the top of the limiting cylinder (6) is lower than the horizontal plane height of the top of the sleeve.

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