A screening device for modified TPU particle production

Abstract

The utility model discloses a screening device for modified TPU granule production, include: support column, support column is provided with four groups, the inboard fixed of support column has two groups of mounting seat, the top of mounting seat is fixed with shock absorber spring, the top of mounting seat is installed with sieve disc through shock absorber spring, the bottom fixed of sieve disc has screen cloth, and the mesh number of screen cloth is increasing gradually from top to bottom, the left end of sieve disc is equipped with the discharge gate, this device sets up the brush to replace the thorn, and the cleaning pressure is dispersed on a large number of intensive brush tip, and the pressure of each contact point is relatively small, and it is not easy to wear, and the physical wear of screen cloth surface (especially metal wire screen, fine sieve plate or expensive coating screen cloth) is smaller, and only when the blockage appears, start the cleaning mechanism, reduce the contact frequency of brush and screen cloth, greatly reduce the wear rate of brush, significantly prolong its replacement cycle, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of TPU particle screening technology, specifically a screening device for the production of modified TPU particles. Background Technology

[0002] Screening is a key process in the production of modified TPU granules, used to remove particles of unqualified size to ensure product consistency. A vibrating screen is a mechanical device that uses a vibrating motor or pneumatic vibrator to drive a screen disc to screen, classify, and remove impurities from granular materials. Shock-absorbing springs are installed on the screen box support frame between the screen box and the support column to support the entire screen body. The main function is to reduce the vibration transmitted to the support structure, while ensuring that the screen disc can vibrate freely, improving screening efficiency and reducing noise and mechanical wear.

[0003] A search revealed that Chinese patent CN220517277U discloses a plastic particle screening device. A motor drives the entire screen box assembly in a high-speed horizontal reciprocating motion via a crank-connecting rod mechanism. The assembly relationship between the support rod and the guide hole not only supports the screen box assembly but also guides its horizontal movement. During this high-speed horizontal reciprocating motion, the screen box assembly can screen plastic particles. Smaller particles, referred to as undersize products, fall into the feed chute, which guides and conveys them. Simultaneously, while the screen box assembly moves horizontally, the bottom surface of the screen continuously moves on the unblocking roller. The protrusions on the outer wall of the unblocking roller are used to promptly eject plastic particles stuck in the screen holes, preventing blockage and ensuring screening efficiency. However, the device still has the following technical problems:

[0004] The device uses a cleaning roller shaft with a barbed structure to clean the screen holes. Although it can effectively reduce the problem of screen hole blockage, the barbs are constantly rubbing against the screen at high speed during the screening process. Long-term use will lead to increased wear of the barbs, reduce their service life, and require frequent replacement, which will affect production efficiency and increase maintenance costs. Therefore, we propose a screening device for the production of modified TPU particles. Utility Model Content

[0005] The purpose of this invention is to provide a screening device for the production of modified TPU particles, in order to solve the problem mentioned in the background art that the device uses a cleaning roller shaft with a barbed structure to clean the screen holes. Although this can effectively reduce the problem of screen hole blockage, the barbed structure is constantly rubbing against the screen at high speed during the screening process. Long-term use will lead to increased wear of the barbed structure, reduce its service life, require frequent replacement, affect production efficiency, and increase maintenance costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a screening device for the production of modified TPU particles, comprising: a support column, wherein four sets of support columns are provided; two sets of mounting seats are fixed to the inner side of the support column; a shock-absorbing spring is fixed to the top of the mounting seat; a screen plate is mounted on the top of the mounting seat through the shock-absorbing spring; a screen mesh is fixed to the bottom of the screen plate, and the mesh size of the screen mesh increases progressively from top to bottom; a discharge port is opened at the left end of the screen plate; a powder receiving tray is provided below the screen mesh at the bottom end; and a pneumatic vibrator is fixed to the bottom of the screen plate. The actuator has two sets of mounting plates fixed on one side of the support column. The two sets of mounting plates on the same layer are rotatably connected to two sets of lead screws via bearings. A first slider is movably connected to the periphery of the lead screw. A connecting column is fixedly connected to the rear end of the first slider. A rotating roller is rotatably connected to the body of the connecting column. Several brushes are evenly distributed on the surface of the rotating roller. A second slider is fixedly connected to the rear end of the connecting column. A limiting post is inserted inside the second slider. Both ends of the limiting post are fixedly connected to the mounting plate. A drive mechanism is installed at the end of one set of lead screws.

[0007] In a preferred embodiment of this utility model, the drive mechanism includes a mounting shell fixed to the right edge of the mounting plate. An inclined plate is fixedly connected inside the mounting shell. A driven pulley is fixedly connected to the right end of one set of lead screws through the inclined plate. A conveyor belt is in frictional contact with the outer side of the driven pulley. A driving pulley is provided on the inner side of the bottom end of the conveyor belt. A turbine is coaxially connected to the right end of the driving pulley. A worm gear is meshed with the top end of the turbine. The front end of the worm gear passes through the mounting shell and is connected to a motor via a coupling. The right end of another set of lead screws passes through the mounting plate and is fixedly connected to the driving pulley and the turbine.

[0008] As a preferred embodiment of this utility model, a ball bearing is provided between the connecting column and the rotating roller, and the bristle length of the brush is greater than the center distance between the screen and the rotating roller.

[0009] As a preferred embodiment of this utility model, the axial center line of the rotating roller is parallel to the screen plane, and the sweeping range of the brush covers the effective screening area of ​​the screen.

[0010] As a preferred embodiment of this utility model, the first slider has an internal threaded hole at its center that matches the lead screw, and the second slider has a through hole at its center that matches the limiting post, and the second slider slides in cooperation with the limiting post through the through hole.

[0011] As a preferred embodiment of this utility model, the conveyor belt is a synchronous toothed belt with its inclined plates arranged in parallel, and the driven pulley is linked with the driving pulley through the conveyor belt.

[0012] In a preferred embodiment of this utility model, the worm gear meshes with the turbine, and the worm gear forms a linkage structure with the lead screw at the bottom end through the turbine.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Extended screen life: Unlike the continuous friction mode between the cleaning components and the screen in the above devices, this device uses brushes instead of barbs. The cleaning pressure is distributed on a large number of dense brush bristle tips. The pressure at each contact point is relatively small, making it less prone to wear and causing less physical wear on the screen surface (especially metal wire mesh, fine screen plates, or expensive coated screens). Moreover, the cleaning mechanism is activated only when a blockage occurs, reducing the frequency of contact between the brush and the screen, significantly reducing the wear rate of the brush, significantly extending its replacement cycle, and reducing production costs.

[0015] 2. Efficiently solves screen clogging problems: Adopts a dynamic cleaning structure that combines brushes and rotating rollers. When the screen is clogged, the brushes rotate and move horizontally. This continuous friction and peeling action is more effective in removing materials with strong adhesion or tight blockage. It can accurately penetrate the screen holes to remove blockages. Compared with the original thorn-protrusion structure, the cleaning is more thorough.

[0016] 3. High efficiency and energy saving in power transmission: It adopts a composite transmission structure of worm gear, turbine, pulley and conveyor belt. Two sets of lead screws are driven by a single motor to operate synchronously, which not only ensures stable power output of the cleaning components, but also reduces the number of power sources and reduces equipment energy consumption and maintenance costs. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the mounting shell in this utility model;

[0020] Figure 3 In this utility model Figure 1 A larger image is shown in section A;

[0021] Figure 4 This is a top view cross-sectional structural diagram of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the transfer roller of this utility model.

[0023] In the diagram: 1. Support column; 11. Mounting base; 112. Shock-absorbing spring; 12. Screen tray; 13. Screen mesh; 14. Discharge port; 15. Powder receiving tray; 16. Pneumatic vibrator;

[0024] 2. Mounting plate; 21. Lead screw; 22. Limiting post; 23. First slider; 231. Second slider; 24. Connecting post; 25. Rotating roller; 26. Brush;

[0025] 3. Mounting housing; 31. Inclined plate; 32. Driven pulley; 33. Conveyor belt; 34. Driven pulley; 35. Turbine; 36. Worm gear; 37. Motor. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example

[0028] Please see Figure 1-5 This utility model provides the following technical solution: a screening device for the production of modified TPU particles, comprising: a support column 1, four sets of support columns 1, two sets of mounting seats 11 fixed on the inner side of the support column 1, a shock-absorbing spring 112 fixed at the top of the mounting seat 11, a screen plate 12 mounted on the top of the mounting seat 11 via the shock-absorbing spring 112, a screen mesh 13 fixed at the bottom of the screen plate 12, the mesh number of the screen mesh 13 increasing progressively from top to bottom, a discharge port 14 opened at the left end of the screen plate 12, a powder receiving tray 15 arranged below the bottom screen mesh 13, and a pneumatic vibrator 16 fixed at the bottom of the screen plate 12. Two sets of mounting plates 2 are fixed on one side of the support column 1. Two sets of lead screws 21 are rotatably connected to the facing surfaces of the two sets of mounting plates 2 on the same layer via bearings. A first slider 23 is movably connected to the periphery of the lead screw 21. A connecting column 24 is fixedly connected to the rear end of the first slider 23. A rotating roller 25 is rotatably connected to the body of the connecting column 24. Several brushes 26 are evenly distributed on the surface of the rotating roller 25. A second slider 231 is fixedly connected to the rear end of the connecting column 24. A limiting column 22 is inserted inside the second slider 231. Both ends of the limiting column 22 are fixedly connected to the mounting plate 2. A drive mechanism is installed at the end of one set of lead screws 21.

[0029] To achieve synchronous drive of the two sets of lead screws 21, specifically, when the motor 37 is working, it drives the worm gear 36 to rotate, and transmits power to one set of lead screws 21 through the meshing worm gear 35. At the same time, one set of lead screws 21 drives the driving pulley 34 to rotate, and drives the driven pulley 32 to rotate through the conveyor belt 33, thereby driving the other set of lead screws 21 to rotate synchronously. This ensures that the two sets of lead screws 21 can operate synchronously, providing stable power for the horizontal movement of the connecting column 24 and the rotating roller 25, and ensuring the smooth operation of the brush 26 cleaning the screen 13 blockage. In this embodiment, as a preferred technical solution of this utility model, the driving... The mechanism includes a mounting shell 3 fixed to the right edge of the mounting plate 2. An inclined plate 31 is fixedly connected inside the mounting shell 3. The right end of a set of lead screws 21 passes through the inclined plate 31 and is fixedly connected to a driven pulley 32. The outer side of the driven pulley 32 is in frictional contact with a conveyor belt 33. A driving pulley 34 is provided on the inner side of the bottom end of the conveyor belt 33. A turbine 35 is coaxially connected to the right end of the driving pulley 34. A worm gear 36 is meshed with the top end of the turbine 35. The front end of the worm gear 36 passes through the mounting shell 3 and is connected to a motor 37 through a coupling. The right end of another set of lead screws 21 passes through the mounting plate 2 and is fixedly connected to the driving pulley 34 and the turbine 35.

[0030] In order to reduce the frictional resistance between the rotating roller 25 and the connecting column 24 by using ball bearings, so that the rotating roller 25 can rotate flexibly, and at the same time ensure that the bristles of the brush 26 can fully contact and penetrate into the screen holes of the screen 13 to effectively remove the particulate impurities clogging the holes, in this embodiment, as a preferred technical solution of the present invention, a ball bearing is provided between the connecting column 24 and the rotating roller 25, and the bristle length of the brush 26 is greater than the center distance between the screen 13 and the rotating roller 25.

[0031] To ensure that the brush 26 maintains a parallel and uniform contact with the surface of the screen 13 during the horizontal movement of the roller 25, and to ensure that the cleaning range of the brush 26 covers the entire effective area of ​​the screen 13 used for screening, thereby achieving comprehensive cleaning of the screen 13 and avoiding cleaning dead corners, in this embodiment, as a preferred technical solution of the present invention, the axial center line of the roller 25 is parallel to the plane of the screen 13, and the sweeping range of the brush 26 covers the effective screening area of ​​the screen 13.

[0032] In order to convert the rotational motion of the lead screw 21 into the axial linear motion of the first slider 23 through the threaded engagement of the first slider 23 and the lead screw 21, and at the same time limit and guide the motion trajectory of the first slider 23 by the sliding of the second slider 231 along the limiting post 22, so as to ensure the stability of the connecting post 24 and the rotating roller 25 during the movement process and avoid deviation and shaking, in this embodiment, as a preferred technical solution of the present invention, the center of the first slider 23 is provided with an internal threaded hole that matches the lead screw 21, and the center of the second slider 231 is provided with a through hole that fits with the limiting post 22, and the second slider 231 slides with the limiting post 22 through the through hole.

[0033] In order to utilize the zero-slip transmission characteristics of the synchronous toothed belt, i.e., the conveyor belt 33, to ensure the synchronous rotation between the driving pulley 34 and the driven pulley 32, and thus realize the coordinated operation of the two sets of lead screws 21, while providing stable support for the conveyor belt 33 through the parallel arrangement of the inclined plates 31, and ensuring the accuracy and stability of the transmission process, in this embodiment, as a preferred technical solution of the present invention, the conveyor belt 33 is a synchronous toothed belt, its inclined plates 31 are arranged in parallel, and the driven pulley 32 is linked with the driving pulley 34 through the conveyor belt 33.

[0034] In order to stably transmit the power of the motor 37 to the bottom lead screw 21 through the meshing relationship between the worm 36 and the worm gear 35, thereby realizing the rotation drive of the bottom lead screw 21, and at the same time utilizing the self-locking characteristic of the worm 36 and worm gear 35 transmission to prevent the lead screw 21 from rotating in the reverse direction when not in operation, thus ensuring the stability of the transmission structure, in this embodiment, as a preferred technical solution of the present invention, the worm 36 and the worm gear 35 are meshed, and the worm 36 and the bottom lead screw 21 form a linkage structure through the worm gear 35.

[0035] In this embodiment, the pneumatic vibrator is a known technology that is widely used in daily life. It is an industrial device that uses compressed air to drive an internal mechanism to generate high-frequency vibration force. Its core working principle is to achieve energy conversion through the synergistic effect of gas dynamics and mechanical structure.

[0036] In summary, with the help of the above-described technical solution of this utility model,

[0037] Screening working principle: During the screening operation, the pneumatic vibrator 16 is turned on by an external power source. The modified TPU particles to be processed are fed into the upper screen plate 12. The pneumatic vibrator 16 at the bottom drives the screen plate 12 to generate high-frequency vibration. The particles are classified and screened by the difference in the aperture of the screen 13. Particles that meet the particle size requirements fall through the upper screen 13 into the lower screen plate 12. After further screening, the qualified particles are discharged from the discharge port 14 of the lower screen plate 12, while powdery impurities with too small a particle size fall through the bottom screen 13 into the powder receiving tray 15 for collection. The shock-absorbing spring 112 is used to reduce the vibration transmitted to the support column 1, while ensuring that the screen plate 12 can vibrate freely, thereby improving screening efficiency and reducing noise and mechanical wear.

[0038] Working principle for clearing blockages: When screen 13 becomes clogged, affecting screening efficiency, the operator first activates motor 37 via external power to trigger the self-cleaning mechanism. Motor 37 drives worm 36 to rotate. Through the meshing transmission between worm 36 and turbine 35, one set of lead screws 21 rotates synchronously. The rotation of one set of lead screws 21 drives the drive pulley 34 to rotate. Through the friction transmission of conveyor belt 33, the driven pulley 32 drives the other set of lead screws 21 to rotate synchronously, achieving coordinated operation of the two sets of lead screws 21. On the other hand, the first slider 23 is threadedly connected to the lead screw 21 and translates axially when the lead screw 21 rotates. The slider 231 slides along the limiting post 22 to maintain motion stability. The sliders on both sides together drive the connecting post 24 to move horizontally. During the movement of the connecting post 24, the rotating roller 25 on its periphery rotates due to friction generated by contact with the bottom surface of the screen 13. The brush 26 on the surface of the rotating roller 25 rotates with the rotating roller 25 and penetrates into the blockage holes of the screen 13. Through mechanical cleaning, it removes the residual particulate impurities in the holes, thereby completing the unblocking operation of the screen 13. The model of the pneumatic vibrator is GT-60, and the model of the motor is servo motor HSX1M-75. This motor has functions such as steering and speed adjustment. The above models are for reference only and should meet the working requirements.

[0039] Finally, it should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screening device for producing modified TPU particles, characterized in that, include: The support column (1) is provided in four sets. Two sets of mounting seats (11) are fixed on the inner side of the support column (1). A shock-absorbing spring (112) is fixed on the top of the mounting seat (11). A screen plate (12) is installed on the top of the mounting seat (11) through the shock-absorbing spring (112). A screen mesh (13) is fixed on the bottom of the screen plate (12). The mesh number of the screen mesh (13) increases from top to bottom. A discharge port (14) is opened on the left end of the screen plate (12). A powder receiving plate (15) is provided below the screen mesh (13) at the bottom end. A pneumatic vibrator (16) is fixed on the bottom of the screen plate (12). Two sets of mounting plates are fixed on one side of the support column (1). (2) Two sets of screw rods (21) are rotatably connected to each other on the two sets of mounting plates (2) on the same layer via bearings. A first slider (23) is movably connected to the periphery of the screw rod (21). A connecting column (24) is fixedly connected to the rear end of the first slider (23). A rotating roller (25) is rotatably connected to the column body of the connecting column (24). Several brushes (26) are evenly distributed on the surface of the rotating roller (25). A second slider (231) is fixedly connected to the rear end of the connecting column (24). A limiting column (22) is provided inside the second slider (231). Both ends of the limiting column (22) are fixedly connected to the mounting plate (2). A driving mechanism is installed at the end of one set of screw rods (21).

2. The screening device for producing modified TPU particles according to claim 1, characterized in that: The drive mechanism includes a mounting shell (3) fixed to the right edge of the mounting plate (2). An inclined plate (31) is fixedly connected inside the mounting shell (3). A driven pulley (32) is fixedly connected to the right end of a set of lead screws (21) through the inclined plate (31). A conveyor belt (33) is in frictional contact with the outer side of the driven pulley (32). A drive pulley (34) is provided on the inner side of the bottom end of the conveyor belt (33). A turbine (35) is coaxially connected to the right end of the drive pulley (34). A worm gear (36) is meshed with the top end of the turbine gear (35). A motor (37) is connected to the front end of the worm gear (36) through the mounting shell (3) via a coupling. The right end of another set of lead screws (21) passes through the mounting plate (2) and is fixedly connected to the drive pulley (34) and the turbine gear (35).

3. The screening device for producing modified TPU particles according to claim 1, characterized in that: A ball bearing is provided between the connecting column (24) and the rotating roller (25), and the bristle length of the brush (26) is greater than the center distance between the screen (13) and the rotating roller (25).

4. The screening device for producing modified TPU particles according to claim 1, characterized in that: The axial centerline of the roller (25) is parallel to the plane of the screen (13), and the sweeping range of the brush (26) covers the effective screening area of ​​the screen (13).

5. The screening device for producing modified TPU particles according to claim 1, characterized in that: The first slider (23) has an internal threaded hole at its center that matches the lead screw (21), and the second slider (231) has a through hole at its center that matches the limiting post (22), and the second slider (231) slides with the limiting post (22) through the through hole.

6. The screening device for producing modified TPU particles according to claim 2, characterized in that: The conveyor belt (33) is a synchronous toothed belt with its inclined plates (31) arranged in parallel. The driven pulley (32) is linked with the driving pulley (34) through the conveyor belt (33).

7. The screening device for producing modified TPU particles according to claim 2, characterized in that: The worm (36) meshes with the turbine (35), and the worm (36) and the lead screw (21) at the bottom end form a linkage structure through the turbine (35).

Images