A plastic particle vacuum feeding device

Abstract

This invention discloses a vacuum feeding device for plastic granules, characterized by comprising: a suction pipe with conical holes arranged in a circumferential array on its inner wall; a sleeve fitted onto the outer wall of the suction pipe and communicating with the conical holes; a second vacuum pipe fixedly installed on the side wall of the hopper and communicating with the sleeve; a winding assembly, including at least a winding roller rotatably disposed within the sleeve; a filter cloth fitted onto the winding roller and extending around the inner wall of the sleeve into a cleaning tank, one end of the filter cloth being fixedly fitted with a plug, the plug abutting against the port of the cleaning tank; and a pushing assembly, including at least a pushing blade arranged in a circumferential array within the suction pipe and driven to rotate. The vacuum feeding device for plastic granules provided by this invention effectively prevents the accumulation of large amounts of dust on the surface of the filter rod in a short time, significantly extends the single-use cycle of the filter rod, avoids suction interruptions and vacuum fluctuations caused by filter assembly blockage, and ensures the continuity and stability of production.

Description

Technical Field

[0001] This invention relates to the field of vacuum feeding device technology, and more particularly to a vacuum feeding device for plastic granules. Background Technology

[0002] In the plastic recycling and processing industry, recycled plastic granules, after being crushed and granulated, typically need to be transported to downstream equipment such as extruders, injection molding machines, or storage tanks using vacuum feeding devices. Vacuum feeding devices are widely used in the plastic granule conveying process due to their compact structure, enclosed and dust-free conveying process, and high degree of automation.

[0003] The existing vacuum feeding device uses a vacuum pump to generate negative pressure in a sealed hopper, and uses a suction pipe to draw plastic particles into the hopper. At the same time, a filter rod installed inside the hopper intercepts dust in the airflow, preventing it from entering the vacuum pump. When the airflow containing dust passes through the filter rod, the dust is blocked and adheres to the surface of the filter rod, and the filtered clean air is then drawn into the vacuum pump.

[0004] However, for recycled plastic pellets, since they mostly originate from waste plastic products, after mechanical crushing, the pellets inevitably contain a large amount of fine debris and powdery impurities. When these plastic pellets are being processed, these fine particles are sucked into the hopper along with the pellets. Although the filter rods can intercept them, because the debris content in recycled material is much higher than in virgin material, a large amount of dust accumulates on the surface of the filter rods in a short time, resulting in the following prominent problems:

[0005] (1) The effective filtration area of ​​the filter rod decreases rapidly, the air permeability decreases significantly, causing fluctuations in the vacuum level in the hopper, rapid decline in feeding efficiency, and even interruption of feeding, which seriously affects the continuity and stability of production.

[0006] (2) Accumulated dust is easily embedded in the pores on the surface of the filter rod under negative pressure, which is difficult to remove effectively by conventional backflushing or vibration cleaning. This leads to frequent clogging of the filter components and a significant reduction in service life. Workers need to stop the machine every once in a while to replace or clean the filter rod, which not only increases the maintenance frequency of the equipment and the intensity of manual labor, but also significantly reduces the effective working time of the production line.

[0007] Therefore, how to provide a vacuum feeding device for plastic granules is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] One objective of this invention is to provide a vacuum feeding device for plastic granules, which effectively solves the problem of frequent clogging of filter rods due to excessive impurity content in plastic granules, resulting in reduced service life and unstable production process.

[0009] A vacuum feeding device for plastic granules according to an embodiment of the present invention includes: a hopper, a vacuum pump, a first vacuum tube, and a suction tube, characterized in that it further includes:

[0010] The inner wall of the suction tube is provided with conical holes arranged in a circumferential array;

[0011] A sleeve fitted onto the outer wall of the suction pipe and connected to a conical hole, wherein a cleaning groove is provided on the side wall of the sleeve;

[0012] A second vacuum tube is fixedly installed on the side wall of the hopper and connected to the sleeve;

[0013] A take-up assembly, comprising at least a take-up roller within a rotatable sleeve;

[0014] A filter cloth is sleeved on a take-up roller and extends around the inner wall of the sleeve into the cleaning tank. A plug is fixedly installed at one end of the filter cloth, and the plug abuts against the port of the cleaning tank.

[0015] A feeding assembly, comprising at least a feeding blade arranged in a circumferential array within a suction tube and driven to rotate.

[0016] Preferably, the winding assembly further includes a mainspring, wherein the sleeve has symmetrically arranged mounting grooves, a winding roller is movably connected in the mounting grooves, and a mainspring is fixedly installed in the mounting grooves, with one end of the mainspring being engaged with the winding roller.

[0017] Preferably, C-shaped support blocks are fixedly installed on the opposite side walls of the sleeve, and the back of the C-shaped support blocks abuts against the filter cloth.

[0018] Preferably, sealing plates are symmetrically arranged inside the cleaning tank, and a plug abuts against the end face of the sealing plate.

[0019] Preferably, the feeding assembly further includes a driving assembly. A groove is provided inside the suction tube, and the driving assembly is fixedly installed in the groove. A feeding blade arranged in a circumferential array is movably connected inside the driving assembly, and the back of the feeding blade is movably connected to the inner wall of the suction tube.

[0020] Preferably, the drive assembly includes a stator coil, a bearing, and an annular rotor. The stator coil is fixedly connected in a groove, a bearing is fixedly connected to the stator coil, an annular rotor is movably connected to the inner wall of the bearing, and a pusher blade is fixedly connected to the inner wall of the annular rotor.

[0021] Preferably, the end face of the pusher blade is provided with a linear array of blades.

[0022] Preferably, the outer wall of the suction pipe is provided with sealing grooves arranged in a circular array, the bottom end of the sealing groove is connected to a conical hole, the sealing groove is connected to a sleeve, and a sealing assembly is movably installed in the sealing groove.

[0023] Preferably, the sealing assembly comprises a sealing block, a latex sheet, and a chute. The suction pipe has symmetrically arranged chutes that are connected to the sealing groove. The sealing groove contains a linear array of sealing blocks, the ends of which are inserted into the chute. Latex sheets are symmetrically arranged at the bottom of the sealing block and are movably connected to the chute.

[0024] The beneficial effects of this invention are:

[0025] This invention utilizes a conical array of holes arranged in a circular pattern on the inner wall of the front end of the suction pipe, and a second vacuum tube to provide independent negative pressure to the sleeve, generating a high-speed suction airflow at the small opening of the conical holes. When plastic particles enter the suction pipe, they first pass through this high-speed suction area, where a large number of fine fragments and powdery impurities mixed in with the plastic particles are drawn into the sleeve for collection. The filtered plastic particles are intercepted by the small opening of the conical holes within the suction pipe. Through the combined action of the pushing component and the suction force provided by the first vacuum tube from the tail end of the suction pipe, the filtered plastic particles are drawn into the tail end of the suction pipe and collected in the hopper. This achieves pre-classification and separation of dust impurities from plastic particles, significantly reducing the dust content carried in the plastic particles entering the hopper. The filter rod installed in the hopper only needs to perform secondary filtration of the airflow, effectively preventing the accumulation of large amounts of dust on the filter rod surface in a short time, significantly extending the single-use cycle of the filter rod, avoiding suction interruptions and vacuum fluctuations caused by filter component blockage, and ensuring the continuity and stability of production.

[0026] This invention, by incorporating a spring, a take-up roller, a filter cloth, and a stopper, intercepts and collects fine particles and impurities entering the sleeve onto the filter cloth laid inside the sleeve. When the particles and impurities on the filter cloth need cleaning, pulling the stopper pulls the filter cloth out of the sleeve, allowing workers to clean it. During this process, the filter cloth drives the take-up roller to rotate, causing the spring to deform and store power. After cleaning, the spring drives the take-up roller to rotate in the opposite direction to rewind the filter cloth, automatically resetting it for reuse. Workers can clean the filter cloth without disassembling the sleeve or stopping the machine, significantly reducing the complexity and labor intensity of maintenance operations, effectively shortening maintenance time, and increasing the effective operating time of the production line.

[0027] This invention, by setting up a driving component and a pusher blade, allows the pusher blade to rotate counterclockwise when plastic particles are adsorbed around the conical hole, scraping and pushing the attached plastic particles. This enables the plastic particles to flow quickly to the tail end of the suction tube. Furthermore, the continuous rotation of the pusher blade can agitate the large number of plastic particles entering the suction tube, effectively preventing the plastic particles from accumulating and clogging inside the suction tube. This ensures smooth suction during long-term operation of the suction tube and further improves the stability and reliability of the feeding process.

[0028] This invention utilizes a sealing groove, a sliding groove, and a sealing block. By driving the sealing block to slide within the sealing groove, the conical hole is blocked, preventing the conical hole from providing suction to the suction pipe. This allows plastic particles entering the suction pipe to be directly sucked into the tail end and into the first vacuum tube. The first vacuum tube then rapidly draws fresh plastic particles with low impurity content into the hopper for feeding, effectively improving feeding efficiency. By reversing the sliding of the sealing block to disengage from the conical hole, impurities in the plastic particles can be collected again. The switching between the two modes is simple, allowing the vacuum feeding device to flexibly adjust its working state according to the actual cleanliness of the plastic particles, further expanding the applicability and adaptability of the equipment. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a schematic diagram of the overall structure of a vacuum feeding device for plastic granules proposed in this invention.

[0031] Figure 2 This is a schematic cross-sectional view of the suction pipe of a vacuum feeding device for plastic granules proposed in this invention.

[0032] Figure 3 This is a schematic diagram of the conical hole cross-sectional structure of a vacuum feeding device for plastic granules proposed in this invention.

[0033] Figure 4 This is a schematic diagram of the suction pipe structure of a vacuum feeding device for plastic granules proposed in this invention.

[0034] Figure 5 This is a schematic diagram of the sleeve structure of a vacuum feeding device for plastic granules proposed in this invention.

[0035] Figure 6 This is a schematic diagram of the filter cloth structure of a vacuum feeding device for plastic granules proposed in this invention.

[0036] Figure 7This is a schematic diagram of the limiting block structure of a vacuum feeding device for plastic granules proposed in this invention.

[0037] Figure 8 This is a schematic diagram of the cross-sectional structure of the sleeve of a vacuum feeding device for plastic granules proposed in this invention.

[0038] Figure 9 This is a schematic diagram of the shovel structure of a vacuum feeding device for plastic granules proposed in this invention.

[0039] Figure 10 This is a partial structural diagram of the drive component of a vacuum feeding device for plastic granules proposed in this invention.

[0040] Figure 11 This is a schematic diagram of the sealing component structure of a vacuum feeding device for plastic granules proposed in this invention.

[0041] Figure 12 This is a schematic diagram of the sealing block structure of a vacuum feeding device for plastic granules proposed in this invention.

[0042] In the diagram: 1. Hopper; 2. Vacuum motor; 3. First vacuum tube; 4. Second vacuum tube; 5. Suction pipe; 6. Stator coil; 7. Bearing; 8. Annular rotor; 10. Pusher knife; 11. Blade; 12. Tapered hole; 13. Sleeve; 15. C-shaped support block; 16. Mounting groove; 17. Take-up roller; 18. Filter cloth; 19. Plug; 20. Sealing plate; 21. Spring; 23. Drive assembly; 25. Second sealing ring; 26. Take-up assembly; 27. Cleaning tank; 28. Pusher assembly; 29. ​​Groove; 34. Sealing assembly; 35. Sealing block; 36. Slide groove; 37. Sealing groove; 38. Latex sheet. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0044] refer to Figure 1 —10, comprising: hopper 1, vacuum pump 2, first vacuum tube 3, and suction pipe 5, characterized in that it further comprises:

[0045] The inner wall of the suction pipe 5 is provided with conical holes 12 arranged in a circumferential array;

[0046] A sleeve 13 is fitted onto the outer wall of the suction pipe 5 and communicates with the conical hole 12. A sliding groove 36 is provided on the side wall of the sleeve 13.

[0047] A second vacuum tube 4 is fixedly installed on the side wall of hopper 1 and connected to sleeve 13;

[0048] The winding assembly 26 includes at least a winding roller 17 rotatably disposed within the sleeve 13;

[0049] A filter cloth 18 is sleeved on the take-up roller 17 and extends around the inner wall of the sleeve 13 into the slide groove 36. A plug 19 is fixedly installed at one end of the filter cloth 18 and abuts against the port of the cleaning tank 27.

[0050] The feeding assembly 28 includes at least a feeding blade 10 arranged in a circumferential array within the suction pipe 5 and driven to rotate.

[0051] In this embodiment, a first vacuum tube 3 installed on the hopper 1 is connected to a suction pipe 5. A vacuum pump 2 provides suction to the hopper 1, creating a negative pressure within the hopper 1 that provides suction to the first vacuum tube 3. The other end of the first vacuum tube 3 is connected to the tail end of the suction pipe 5, allowing the suction pipe 5 to draw plastic granules into the hopper 1. When the suction pipe 5 draws in plastic granules, a second vacuum tube 4 fixedly installed on the hopper 1 is sealed to a sleeve 13 fixedly installed on the side wall of the suction pipe 5, providing suction to the sleeve 13 and creating a negative pressure within the sleeve 13. Multiple sets of conical holes 12 arranged in a circumferential array are formed on the side wall of the suction pipe 5 near its port. The smaller end of the conical hole 12 communicates with the interior of the suction pipe 5, while the larger end communicates with the sleeve 13. The sleeve 13 provides suction to the larger end of the conical orifice 12, causing the smaller end of the conical orifice 12 to draw in the plastic particles entering the suction pipe 5. The smaller end of the conical orifice 12 increases the airflow velocity, creating a high-speed airflow region within the area of ​​the conical orifice 12 at the front end of the suction pipe 5. When the plastic particles enter the suction pipe 5, because the conical orifice 12 is located at the front end, the plastic particles first enter the suction range of the conical orifice 12. The high-speed airflow generated by the suction of the conical orifice 12 carries the plastic particles towards the conical orifice 12, allowing fine particles and powdery impurities mixed in with the plastic particles to be drawn into the conical orifice 12. The smaller end of the conical orifice 12 filters the plastic particles, trapping them within the suction pipe 5. After passing through the conical orifice 12, the fine particles and powdery impurities are drawn into the sleeve 13. The winding assembly 26 installed inside the sleeve 13 includes a winding roller 17 rotatably mounted on the inner wall of the sleeve 13, and a filter cloth 18 capable of being wound is fixedly installed on the side wall of the winding roller 17. The filter cloth 18 is laid along the inner wall of the sleeve 13 and covers the conical hole 12. When fine particles and powdery impurities pass through the conical hole 12 and enter the sleeve 13, they are intercepted by the filter cloth 18 and adhere to the outer surface of the filter cloth 18. This allows the filter cloth 18 to filter out the particles and impurities carried in the airflow, preventing these impurities from entering the hopper 1 along the second vacuum tube 4. One end of the filter cloth 18, on which the plug 19 is fixedly installed, extends into the cleaning tank 27. The plug 19 is adapted to the cleaning tank 27, so that the filter cloth 18 wound on the winding roller 17 can provide tension to the plug 19, thereby causing the plug 19 to abut against the outer port of the cleaning tank 27 and seal the cleaning tank 27, preventing airflow from entering the sleeve 13 from the cleaning tank 27 and affecting the suction of the conical hole 12. At the same time, the negative pressure generated in the sleeve 13 continuously provides suction to the plug 19 through the cleaning tank 27, making the sealing effect of the plug 19 more stable.When particles and impurities attached to the filter cloth 18 need to be cleaned, by providing a pulling force to the stopper 19, the stopper 19 pulls the filter cloth 18 wound on the take-up roller 17 to release it, so that the worker can pull the filter cloth 18 out of the sleeve 13 along the cleaning groove 27 for quick cleaning.

[0052] After the filter cloth 18 is cleaned, the winding roller 17 is driven to rotate and rewind the filter cloth 18, so that the filter cloth 18 can be automatically recycled into the sleeve 13 for filtering and collecting particles and impurities again. When plastic particles are attracted to the inner wall of the suction pipe 5 by the suction of the conical hole 12, the pusher blades 10 on the inner wall of the suction pipe 5 are driven to rotate counterclockwise. During the rotation, the pusher blades 10 continuously remove the plastic particles attracted to the conical hole 12. The end face of the pusher blade 10 is arc-shaped. When the scraper blade continues to rotate and remove the attached plastic particles, the plastic particles scraped off later continuously push the plastic particles scraped off earlier, so that the plastic particles scraped off earlier are pushed along the arc-shaped end face of the scraper blade, so that the plastic particles are continuously moved away from the conical hole 12 during the continuous scraping of the pusher blade 10. When the pusher blade 10 moves to the port of the conical hole 12, the back of the pusher blade 10 blocks the conical hole 12, causing the blocked conical hole 12 to stop generating suction on the plastic particles. This allows the plastic particles adsorbed around the conical hole 12 to quickly detach. Furthermore, the first vacuum tube 3 continuously provides suction at the tail end of the suction tube 5, allowing the plastic particles detached from the area of ​​the conical hole 12 to be quickly sucked into the tail end of the suction tube 5. The plastic particles are then drawn into the hopper 1 through the first vacuum tube 3, where they are collected. The filter rod installed in the hopper 1 only needs to perform secondary filtration of the airflow carrying the plastic particles, preventing a large amount of dust from accumulating on the surface of the filter rod in a short time and improving production stability. By connecting the outlet of the hopper 1 to downstream processing equipment, the feeding process of the plastic particles can be completed.

[0053] refer to Figure 6 —8. The winding assembly 26 also includes: a spring 21, a sleeve 13 with symmetrically arranged mounting grooves 16, a winding roller 17 movably connected in the mounting grooves 16, and a spring 21 fixedly installed in the mounting grooves 16, with one end of the spring 21 snapped into the winding roller 17.

[0054] In this embodiment, the winding assembly 26 consists of a spring 21 and a winding roller 17. The spring 21 is fixedly installed in the mounting groove 16 opened in the sleeve 13, and one end of the spring 21 is fixedly connected to the winding roller 17 extending into the mounting groove 16. This allows the spring 21 to deform and store energy as the winding roller 17 rotates. When the stopper 19 is pulled by tension, causing the filter cloth 18 wound on the winding roller 17 to extend outward from the sleeve 13 along the cleaning groove 27, the wound filter cloth... 18 pulls the take-up roller 17 to rotate, causing the take-up roller 17 to drive the spring 21 to deform and store power during the rotation. After the particles and impurities adsorbed on the filter cloth 18 are cleaned, the worker stops pulling the stopper 19. The deformed and stored spring 21 drives the take-up roller 17 to rotate in the opposite direction to rewind the released filter cloth 18, so that the filter cloth 18 extending out of the sleeve 13 along the cleaning groove 27 returns to the sleeve 13 and filters the particles and impurities entering the sleeve 13 again.

[0055] refer to Figure 5 C-shaped support blocks 15 are fixedly installed on the opposite side walls of the sleeve 13, and the back of the C-shaped support blocks 15 abuts against the filter cloth 18.

[0056] In this embodiment, the curvature of the back of the C-shaped support block 15 is the same as the curvature of the inner wall of the sleeve 13. The C-shaped support blocks 15, which are symmetrically arranged on two opposite side walls inside the sleeve 13, limit the two sides of the filter cloth 18, so that the filter cloth 18 can be laid along the inner wall of the sleeve 13. This allows the surface of the filter cloth 18 to completely cover the conical hole 12, preventing the edges of the filter cloth 18 from folding. When the filter cloth 18 moves, the curvature of the back of the C-shaped block limits the movement trajectory of the filter cloth 18, so that the filter cloth 18 can only move along a fixed movement trajectory when it is wound up and unwound, preventing the filter cloth 18 from shifting during repeated winding.

[0057] refer to Figure 7 A sealing sheet 20 is symmetrically arranged inside the cleaning tank 27, and a plug 19 abuts against the end face of the sealing sheet 20.

[0058] In this embodiment, when the filter cloth 18 pulls the plug 19 to the outer port of the cleaning tank 27, the winding roller 17 winds up the filter cloth 18 to provide tension to the plug 19, so that the plug 19, which has detached from the cleaning tank 27, is pulled back into the cleaning tank 27 and abuts against the two sealing plates 20 symmetrically arranged inside the port of the cleaning tank 27. The plug 19 is subjected to the tension provided by the filter cloth 18, which compresses the sealing plates 20 to deform, so that the sealing plates 20 and the outer wall of the plug 19 fit together. Thus, the deformation of the sealing plates 20 can seal the small gap between the plug 19 and the cleaning tank 27, improve the sealing effect of the outer wall of the sleeve 13, and at the same time, the elastic material of the sealing plates 20 can reduce the friction between the plug 19 and the cleaning tank 27, and reduce the wear of the plug 19 and the port of the cleaning tank 27.

[0059] refer to Figure 2 The feeding assembly 28 also includes a driving assembly 23. A groove 29 is provided inside the suction pipe 5. The driving assembly 23 is fixedly installed inside the groove 29. A pushing blade 10 arranged in a circular array is movably connected inside the driving assembly 23. The back of the pushing blade 10 is movably connected to the inner wall of the suction pipe 5.

[0060] In this embodiment, a groove 29 is formed on the inner wall of the suction pipe 5, allowing the drive assembly 23 to be installed within the groove 29. When the drive assembly 23 is installed, its inner wall is horizontal to the inner wall of the feed pipe. This ensures a smoother airflow towards the tail end of the suction pipe 5 when the first vacuum tube 3 provides suction. It also prevents the drive assembly 23 from protruding beyond the inner wall of the suction pipe 5, thus avoiding obstruction of airflow and the flow of plastic particles. When plastic particles adsorbed at the small opening of the conical hole 12 need to be removed, the drive assembly 23 drives the pusher blade 10 to rotate counterclockwise along the inner wall of the suction pipe 5. This pusher blade 10 pushes the plastic particles away from the suction area of ​​the conical hole 12 during rotation, allowing the filtered plastic particles to be sucked into the tail end of the suction pipe 5. The pusher blade 10 is continuously driven to rotate on the inner wall of the suction pipe 5 by the drive component 23, so that the pusher blade 10 can agitate the large amount of plastic particles entering the suction pipe 5, prevent the plastic particles from clogging the suction pipe 5, and make the suction process of the suction pipe 5 smoother.

[0061] refer to Figure 9 —10, the drive assembly 23 consists of a stator coil 6, a bearing 7, and an annular rotor 8. The stator coil 6 is fixedly connected in the groove 29. The bearing 7 is fixedly connected to the stator coil 6. The annular rotor 8 is movably connected to the inner wall of the bearing 7. The pusher blade 10 is fixedly connected to the inner wall of the annular rotor 8.

[0062] In this embodiment, the drive assembly 23 consists of a stator coil 6, a bearing 7, and an annular rotor 8. The stator coil 6, bearing 7, and annular rotor 8 are all installed in the groove 29. When the pusher blade 10 needs to be driven to rotate, the stator coil 6 is powered by an external battery. After the stator coil 6 is energized, it generates an alternating magnetic field. The annular rotor 8 is in this magnetic field. Under the action of electromagnetic induction, the annular rotor 8 is subjected to electromagnetic torque, thereby generating rotational motion. The bearing 7 is assembled between the stator coil 6 and the annular rotor 8, providing radial support and positioning for the annular rotor 8, while also reducing friction generated during the rotation of the annular rotor 8. The pusher blade 10 is fixedly installed on the inner wall of the annular rotor 8. When the annular rotor 8 rotates, it directly drives the pusher blade 10 to rotate counterclockwise. The counterclockwise rotation of the pusher blade 10 removes the plastic particles attached to the conical hole 12, allowing the plastic particles to be sucked into the first vacuum tube 3 by the airflow at the tail end of the suction tube 5. A second sealing ring 25 is embedded at the connection between the first vacuum tube 3 and the suction tube 5 to prevent gaps from forming at the connection between the first vacuum tube 3 and the suction tube 5, which would affect the suction force of the suction tube 5.

[0063] refer to Figure 9 The pusher blade 10 has a linear array of blades 11 on its end face.

[0064] In this embodiment, when the pusher blade 10 of the annular rotor 8 rotates counterclockwise, the blades 11, which are fixedly installed on the end face of the pusher blade 10 and arranged in a linear array at an angle, rotate accordingly to remove the plastic particles adsorbed around the conical hole 12. Since the blades 11 are inclined with their lower ends facing the front end of the suction pipe 5, the plastic particles roll directionally upward along the inclined lower end of the blades 11 during the removal process, thereby moving away from the area of ​​the conical hole 12. At the same time, the multiple sets of inclined blades 11 on the pusher blade 10 cooperate with each other during the rotation to guide the airflow, causing the airflow to form a slight spiral flow and move towards the tail end of the suction pipe 5. The spiral airflow generates a centripetal convergence effect during the movement, guiding the plastic particles to the axis of the suction pipe 5, so that the plastic particles are further away from the conical hole 12, thereby avoiding the particles being adsorbed onto the surface of the conical hole 12 for a second time and improving the conveying efficiency of the plastic particles to the tail end of the suction pipe 5.

[0065] refer to Figure 11 —12, a sealing groove 37 arranged in a circular array is provided on the outer wall of the suction pipe 5. The bottom end of the sealing groove 37 is connected to the conical hole 12. The sealing groove 37 is connected to the sleeve 13. A sealing component 34 is movably installed in the sealing groove 37.

[0066] In this embodiment, the sealing groove 37 on the outer wall of the suction pipe 5 is connected to the conical hole 12 and the sleeve 13 respectively. The suction force generated by the negative pressure in the sleeve 13 needs to be transmitted to the conical hole 12 through the sealing groove 37. When the sealing component 34 installed in the sealing groove 37 is driven, it can slide horizontally in the sealing groove 37. When the sealing component 34 covers the large end of the conical hole 12 during its movement, the sealing component 34 seals the conical hole 12, so that the suction force generated by the negative pressure in the sleeve 13 cannot be transmitted to the conical hole 12, thereby stopping the conical hole 12 from generating suction force. When the conical hole 12 stops generating suction force, only the first vacuum tube 3 installed at the tail end provides suction force in the suction pipe 5. The newly produced plastic particles flow directly through the front end of the suction pipe 5 into the first vacuum tube 3, improving the efficiency of the plastic particles flowing into the first vacuum tube 3, thus improving the feeding efficiency of the vacuum feeding device, so that the vacuum feeding device can switch different feeding modes according to different plastic particles.

[0067] refer to Figure 11 —12, the sealing assembly 34 consists of a sealing block 35, a latex sheet 38, and a chute 36. The suction pipe 5 has symmetrically arranged chute 36, which is connected to the sealing groove 37. The sealing groove 37 has a linear array of sealing blocks 35, the ends of which are inserted into the chute 36. The bottom of the sealing block 35 has symmetrically arranged latex sheets 38, which are movably connected to the chute 36.

[0068] In this embodiment, the suction pipe 5 has a sliding groove 36 that communicates with the sealing groove 37. The two ends of the sealing block 35 are inserted into the sliding groove 36 and can slide along the sliding groove 36 inside the sealing groove 37. When it is necessary to close the conical hole 12, the sealing block 35 is pushed to the end position of the conical hole 12 to block the conical hole 12. After the conical hole 12 is blocked, the airflow inside the suction pipe 5 can only flow from the front end to the rear end, which facilitates the feeding operation of newly produced plastic granules. When the sealing block 35 is pushed away from the position of the conical hole 12, the conical hole 12 opens, and the negative pressure inside the sleeve 13 provides suction force for the conical hole 12. The conical hole 12 can then suck up the plastic granules entering the front end of the suction pipe 5, and suck the fine particles and powder impurities mixed in the plastic granules into the sleeve 13. The sealing block 35 is inserted into both ends of the slide groove 36 and the latex sheet 38 is fixedly installed. During the sliding of the sealing block 35 along the slide groove 36, the latex sheet 38 comes into contact with the inner wall of the slide groove 36 and generates frictional resistance. The sealing block 35 is locked in place by the frictional resistance, so that the sealing block 35 can stay at any position of the slide groove 36, which makes it easy for the operator to adjust the working position of the sealing block 35.

[0069] Working principle: When feeding plastic granules, the vacuum pump 2 on the hopper 1 is activated, creating negative pressure inside the hopper 1. This negative pressure is then generated by connecting the first vacuum tube 3 to the tail end of the suction tube 5, creating a main airflow from the front end to the tail end inside the suction tube 5. Simultaneously, the second vacuum tube 4 draws suction from the inside of the sleeve 13, creating a negative pressure environment inside the sleeve 13. The inner wall of the front end of the suction tube 5 has a circumferential array of conical holes 12, with the smaller end connected to the inner cavity of the suction tube 5 and the larger end connected to the sleeve 13. The negative pressure environment of the sleeve 13 provides suction to the conical holes 12 from the larger end to the smaller end, resulting in a high-speed airflow from the smaller end to the larger end of the conical holes 12. When plastic granules are sucked into the suction pipe 5, they first enter the area where the conical hole 12 is located. The airflow generated by the suction of the conical hole 12 carries the fine particles and powder impurities mixed in with the plastic granules through the conical hole 12 and into the sleeve 13. Larger plastic granules are intercepted by the small end of the conical hole 12 in the suction pipe 5, thus achieving pretreatment of the fine particles and impurities contained in the plastic granules. The airflow containing impurities that passes through the conical hole 12 enters the sleeve 13. The filter cloth 18 laid in the sleeve 13 covers the conical hole 12, so that when the airflow flows through the filter cloth 18, the fine particles and powder are intercepted and attached to the outer surface of the filter cloth 18. The filtered airflow is then drawn back into the hopper 1 through the second vacuum tube 4.

[0070] When impurities collected on the filter cloth 18 need to be cleaned, the worker pulls the stopper 19 out of the cleaning trough 27, causing the stopper 19 to pull the filter cloth 18 out of the cleaning trough 27. Once the filter cloth 18 extends out of the cleaning trough 27, the worker can clean it. Simultaneously, as the filter cloth 18 extends out of the cleaning trough 27, it drives the winding roller 17 to rotate. During the rotation of the winding roller 17, the spring 21 deforms and stores power. After the filter cloth 18 is cleaned, the stored power spring 21 drives the winding roller 17 to rewind the filter cloth 18, pulling it back into the sleeve 13. The C-shaped support block 15 installed inside the sleeve 13 limits and guides the two sides of the filter cloth 18, ensuring a stable winding trajectory and preventing deviation or folding.

[0071] When plastic particles adhere to the conical hole 12, the stator coil 6 in the drive assembly 23 is energized by an external power source to generate an alternating magnetic field, which drives the annular rotor 8 to rotate the pusher blade 10 counterclockwise. The pusher blade 10 rotates counterclockwise along the inner wall of the suction tube 5, allowing it to remove the attached plastic particles. The blades 11 arranged in a linear array on the end face of the pusher blade 10, with their lower ends facing the front end of the suction tube 5, allow the plastic particles to roll directionally along the inclined surface, thus moving away from the conical hole 12. At the same time, multiple sets of inclined blades 11 work together to guide the airflow during rotation, causing the airflow to spiral and move towards the tail end. The spiral airflow guides the plastic particles towards the axis of the suction tube 5, allowing them to move away from the conical hole 12. When the plastic particles move away from the area where the conical hole 12 is located, the suction force generated at the tail end of the suction tube 5 can draw the plastic particles into the first vacuum tube 3 connected to the tail end of the suction tube 5. Plastic granules are drawn into hopper 1 through the first vacuum tube 3, allowing them to be fed into the downstream processing stage. Once inside hopper 1, fine particles and dust impurities are drawn by the airflow to the top-mounted filter rod. The filter rod performs secondary filtration of the impurities in the airflow, preventing fine particles and dust impurities from entering the vacuum pump 2 and causing damage. Furthermore, the primary filtration removes most of the impurities, effectively extending the service life of the filter rod and reducing the frequency of cleaning and replacement of the filter plate.

[0072] When the vacuum feeding device needs to feed newly produced plastic granules, the sealing block 35 is pushed to slide along the slide groove 36, so that the sealing block 35 slides horizontally in the sealing groove 37. When the sealing block 35 covers the conical hole 12 during the sliding process, the sealing block 35 blocks the conical hole 12, so that the conical hole 12 stops sucking up fine particles and dust impurities, so that the plastic granules can directly pass through the front end of the suction pipe 5 to the rear end, improving the flow efficiency of plastic granules in the suction pipe 5.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vacuum feeding device for plastic granules, comprising: a hopper (1), a vacuum pump (2), a first vacuum tube (3), and a suction pipe (5), characterized in that, Also includes: The inner wall of the suction pipe (5) is provided with conical holes (12) arranged in a circumferential array. A sleeve (13) is fitted on the outer wall of the suction pipe (5) and connected to the conical hole (12). A cleaning groove (27) is provided on the side wall of the sleeve (13). A second vacuum tube (4) is fixedly installed on the side wall of the hopper (1) and connected to the sleeve (13); The take-up assembly (26) includes at least a take-up roller (17) inside the rotating setting sleeve (13). A filter cloth (18) is sleeved on the take-up roller (17) and extends around the inner wall of the sleeve (13) into the cleaning tank (27). A plug (19) is fixedly installed at one end of the filter cloth (18) and abuts against the port of the cleaning tank (27). The feeding assembly (28) includes at least a feeding blade (10) arranged in a circumferential array within the suction pipe (5) and driven to rotate.

2. The vacuum feeding device for plastic granules according to claim 1, characterized in that, The winding assembly (26) further includes a spring (21), and the sleeve (13) has symmetrically arranged mounting grooves (16), a winding roller (17) is movably connected in the mounting groove (16), and the spring (21) is fixedly installed in the mounting groove (16), with one end of the spring (21) being engaged with the winding roller (17).

3. The vacuum feeding device for plastic granules according to claim 2, characterized in that, C-shaped support blocks (15) are fixedly installed on the opposite side walls of the sleeve (13), and the back of the C-shaped support blocks (15) abuts against the filter cloth (18).

4. The vacuum feeding device for plastic granules according to claim 1, characterized in that, The cleaning tank (27) is symmetrically provided with sealing plates (20), and a plug (19) is abutted on the end face of the sealing plate (20).

5. The vacuum feeding device for plastic granules according to claim 1, characterized in that, The feeding assembly (28) also includes a driving assembly (23). A groove (29) is provided in the suction pipe (5). The driving assembly (23) is fixedly installed in the groove (29). A feeding blade (10) arranged in a circular array is movably connected inside the driving assembly (23). The back of the feeding blade (10) is movably connected to the inner wall of the suction pipe (5).

6. The vacuum feeding device for plastic granules according to claim 5, characterized in that, The drive assembly (23) includes a stator coil (6), a bearing (7) and an annular rotor (8). The stator coil (6) is fixedly connected in a groove (29). The bearing (7) is fixedly connected to the stator coil (6). The annular rotor (8) is movably connected to the inner wall of the bearing (7). The pusher blade (10) is fixedly connected to the inner wall of the annular rotor (8).

7. The vacuum feeding device for plastic granules according to claim 6, characterized in that, The pusher blade (10) has a linear array of blades (11) on its end face.

8. The vacuum feeding device for plastic granules according to claim 1, characterized in that, The outer wall of the suction pipe (5) is provided with sealing grooves (37) arranged in a circular array. The bottom end of the sealing groove (37) is connected to the conical hole (12). The sealing groove (37) is connected to the sleeve (13). A sealing assembly (34) is movably installed in the sealing groove (37).

9. The vacuum feeding device for plastic granules according to claim 8, characterized in that, The sealing assembly (34) consists of a sealing block (35), a latex sheet (38), and a groove (36). The suction pipe (5) has symmetrically arranged grooves (36) inside. The grooves (36) are connected to the sealing groove (37). The sealing groove (37) has a linear array of sealing blocks (35). The ends of the sealing blocks (35) are inserted into the grooves (36). The bottom of the sealing blocks (35) has symmetrically arranged latex sheets (38), which are movably connected to the grooves (36).

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