A multi-stage screening device for recycled plastic scraps

Abstract

This utility model discloses a multi-stage screening device for recycled plastic fragments, specifically relating to the field of screening device technology. It includes a support frame and a screening bin. Through the arrangement of the material handling components, this utility model addresses two issues: First, when too many plastic fragments enter the feeding bin, they push the sealing plate to slide, causing the transmission shaft and multiple ratchet wheels to rotate. The ratchet wheels, through the limiting action of the locking teeth, cause the cam to rotate synchronously. As the cam rotates, it pushes the limiting plate to move. After one revolution of the cam, a striking plate strikes the sealing plate, dispersing the plastic fragments behind the sealing plate. Second, when the plastic fragments behind the sealing plate are insufficient to move the sealing plate, the stretched first elastic element rebounds, causing the sealing plate to return to its initial position. When there are too many plastic fragments in the feeding bin, the above steps continue, thus enabling more effective screening of the plastic fragments and improving the efficiency of the screening process.

Description

Technical Field

[0001] This utility model relates to the field of screening device technology, and more specifically, to a multi-stage screening device for recycled plastic fragments. Background Technology

[0002] Recycled plastic fragments, commonly referred to as "recycled material" or "crushed material," refer to small-sized flakes or granules of plastic obtained through pre-processing such as recycling, sorting, washing, and crushing. They mainly come from post-consumer plastic waste (such as mineral water bottles, daily chemical bottles, and packaging films) and industrial plastic scraps. They are an intermediate product of plastic recycling and a raw material for manufacturing recycled plastic pellets.

[0003] The working principle of screening devices is based on physical screening. Its core component is a screen with screens of different sizes of holes. These screens move in a specific way (usually tilting or vibrating) to distribute the material on the screen surface. Fragments smaller than the screen hole size fall down, while fragments larger than the screen hole size continue to move forward, thereby achieving classification.

[0004] Chinese patent application number CN202411740339.5 discloses a fragment screening mechanism for plastic granule production. This mechanism includes a frame and a sieve hopper. A coarse screen plate is fixedly installed on the inner wall of the sieve hopper. The mechanism uses a motor to drive a rotating shaft, which, in conjunction with a wheel, cam groove, ball joint rod, push plate, slide rod, spiral groove, and stirring shaft, disperses the plastic granules inside the sieve hopper. Simultaneously, a connecting rod, slide table, and stirring shaft cause the plastic granules inside the hopper to tumble up and down, further improving the dispersion effect and preventing granule adhesion. This avoids clogging the coarse screen plate, improving the screening effect and efficiency. Furthermore, push rods, inclined grooves, sliding plates, and top rods can unclog the feed pipe, preventing plastic granules from blocking its interior and improving feed efficiency.

[0005] Although the above can prevent plastic particles from clogging the coarse screen plate, when the screening device is continuously fed, too much plastic fragments will accumulate on the screen. The vibration of the screening chamber driven by the vibrating motor can easily cause the plastic fragments to move too fast along the screen direction, which can easily cause the smaller plastic fragments on the upper layer to be unable to be effectively screened out, thereby reducing the screening efficiency of the device.

[0006] This invention provides a multi-stage screening device for recycled plastic fragments, which aims to solve the problem that plastic fragments move too fast along the screen direction, resulting in the upper and smaller plastic fragments not being effectively screened out. Utility Model Content

[0007] The purpose of this invention is to provide a multi-stage screening device for recycled plastic fragments, in order to solve the problem mentioned in the background art that the plastic fragments move too fast along the screen direction, resulting in the inability to effectively screen out the upper and smaller plastic fragments.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage screening device for recycled plastic fragments, including a support frame, a screening chamber on the support frame, a stepped screen inside the screening chamber, a vibration motor on the outside of the screening chamber, a feeding chamber above the screening chamber, a finished product outlet and a circulating outlet below the screening chamber, and a stacking processing component on the outside of the feeding chamber; The material handling assembly includes a sealing plate, which is located at the side outlet of the feeding hopper. The feeding hopper is fixedly connected to two sides of symmetrically arranged fixed blocks, each of which has a sliding groove. Both sides of the sealing plate slide within the corresponding sliding groove. A first elastic element is provided between the end of the sealing plate near the feeding hopper and the corresponding sliding groove.

[0009] Preferably, the sealing plate is fixedly connected to a connecting block that is slidably connected in the corresponding sliding groove on the side away from the first elastic member, and each connecting block is provided with an avoidance groove.

[0010] Preferably, a drive shaft is rotatably connected between the two connecting blocks, and gears located in the clearance groove are fixedly connected to both ends of the drive shaft.

[0011] Preferably, each of the fixed blocks has a connection port corresponding to the gear, and a rack is fixedly connected to each connection port, with each gear meshing with the corresponding rack.

[0012] Preferably, the outer side of the drive shaft is provided with a fixing cover that is fixedly connected to the sealing plate, and a sliding plate is slidably connected inside the fixing cover.

[0013] Preferably, the sliding plate is connected to the fixed cover with a plurality of second elastic elements, and a limit plate and a striking plate are fixedly connected to the end of the sliding plate away from the second elastic elements.

[0014] Preferably, the outer wall of the drive shaft is fixedly connected with a plurality of ratchet wheels arranged at equal intervals, and a cam is rotatably connected to the outer side of each ratchet wheel, and one end of the limiting plate is in contact with one side of the plurality of cams.

[0015] Preferably, each cam has a mounting groove on both sides, and each mounting groove on both sides of each cam has a fixing post. Each fixing post is rotatably connected with a locking tooth, and each locking tooth is connected to the corresponding fixing post by a torsion spring.

[0016] The technical effects and advantages of this utility model are as follows: This invention, through the design of the material handling assembly, addresses two issues. Firstly, when excessive plastic fragments enter the feed hopper, these fragments push the sealing plate to slide and stretch the first elastic element. This causes two gears to drive the transmission shaft and multiple ratchet wheels to rotate. The ratchet wheels, through the limiting action of the locking teeth, cause the cam to rotate synchronously. As the cam rotates, it pushes the limiting plate to move and compresses the second elastic element. After one revolution of the cam, the second elastic element pushes the limiting plate down from its highest point, simultaneously causing the striking plate to strike the sealing plate, dispersing the plastic fragments behind it. Secondly, when the plastic fragments behind the sealing plate are insufficient to move it, the stretched first elastic element rebounds, moving the sealing plate. During this movement, the meshing of the two gears and corresponding racks causes the transmission shaft to reverse. When the ratchet reverses, the locking teeth no longer limit its movement, preventing the cam from reversing. When there are too many plastic fragments in the feed hopper, the above steps continue, resulting in more efficient screening of the plastic fragments and improved screening efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall internal structure of this utility model; Figure 3 This is a schematic diagram of the material handling assembly structure of this utility model; Figure 4 This is a schematic diagram of the exploded structure of the material handling assembly of this utility model; Figure 5 This is a cross-sectional view of the fixing block structure of this utility model; Figure 6 This is a cross-sectional view of the fixed cover structure of this utility model; Figure 7 This utility model Figure 6 Enlarged view of the A-section structure; Figure 8 This is a schematic diagram of the explosive structure of the ratchet and cam of this utility model.

[0018] The attached figures are labeled as follows: 1. Support frame; 11. Screening bin; 12. Screen; 13. Vibrating motor; 14. Feed bin; 15. Finished product outlet; 16. Circulating outlet; 2. Material handling assembly; 21. Sealing plate; 22. Fixing block; 23. Sliding groove; 24. First elastic element; 25. Connecting block; 26. Clearance groove; 27. Drive shaft; 28. Gear; 29. ​​Connecting port; 210. Rack; 211. Fixing cover; 212. Sliding plate; 213. Second elastic element; 214. Limiting plate; 215. Striking plate; 216. Ratchet; 217. Cam; 218. Mounting groove; 219. Fixing column; 220. Clamping tooth. Detailed Implementation

[0019] 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. Example

[0020] When the material is continuously fed into the screening device, too much plastic fragments will accumulate on the screen. The vibration of the screening chamber driven by the vibrating motor can cause the plastic fragments to move too fast along the screen direction, which can lead to the smaller plastic fragments on the upper layer not being effectively screened out, thus reducing the screening efficiency of the device.

[0021] refer to Figure 1 and Figure 2 A multi-stage screening device for recycled plastic fragments according to an embodiment of the present invention includes a support frame 1, a screening chamber 11 on the support frame 1, a stepped screen 12 inside the screening chamber 11, a vibration motor 13 outside the screening chamber 11, a feeding chamber 14 above the screening chamber 11, a finished product outlet 15 and a circulating outlet 16 below the screening chamber 11, and a stacking processing component 2 outside the feeding chamber 14.

[0022] With the finished product outlet 15 and the circulating outlet 16, plastic fragments enter the feed hopper 14 from the inlet on the feed hopper 14. Then, the vibration of the vibration motor 13 causes the plastic fragments to move in the screening hopper 11. The qualified fragments are discharged from the finished product outlet 15 to enter the next process, while the unqualified fragments are discharged from the circulating outlet 16 for further crushing and screening.

[0023] refer to Figures 3 to 6The material handling assembly 2 includes a sealing plate 21, which is located at the side outlet of the feeding hopper 14. The feeding hopper 14 is fixedly connected to two sides of symmetrically arranged fixing blocks 22. Each fixing block 22 is provided with a sliding groove 23. Both sides of the sealing plate 21 slide in the corresponding sliding groove 23. A first elastic element 24 is provided between the end of the sealing plate 21 near the feeding hopper 14 and the corresponding sliding groove 23.

[0024] refer to Figure 3 and Figure 5 Each side of the sealing plate 21 away from the first elastic member 24 is fixedly connected to a connecting block 25 that is slidably connected in the corresponding sliding groove 23, and each connecting block 25 is provided with an avoidance groove 26.

[0025] refer to Figures 3 to 5 A drive shaft 27 is rotatably connected between two connecting blocks 25. Both ends of the drive shaft 27 are fixedly connected to gears 28 located in clearance grooves 26. Each fixed block 22 has a connection port 29 corresponding to the gear 28. Each connection port 29 is fixedly connected to a rack 210. Each gear 28 meshes with the corresponding rack 210.

[0026] refer to Figure 5 and Figure 6 The outer side of the drive shaft 27 is provided with a fixed cover 211 that is fixedly connected to the sealing plate 21. A sliding plate 212 is slidably connected inside the fixed cover 211. Multiple second elastic elements 213 are connected to the sliding plate 212 and the fixed cover 211. A limit plate 214 and a striking plate 215 are fixedly connected to one end of the sliding plate 212 away from the second elastic elements 213.

[0027] refer to Figure 7 and Figure 8 The outer wall of the drive shaft 27 is fixedly connected with a plurality of ratchet wheels 216 arranged at equal intervals. Each ratchet wheel 216 is rotatably connected to a cam 217 on its outer side. One end of the limiting plate 214 is in contact with one side of the plurality of cams 217.

[0028] refer to Figure 7 and Figure 8 Each cam 217 has a mounting groove 218 on both sides, and a fixing post 219 is provided in the mounting groove 218 on both sides of each cam 217. Each fixing post 219 is rotatably connected with a locking tooth 220, and each locking tooth 220 is connected to the corresponding fixing post 219 by a torsion spring.

[0029] In actual use, when plastic fragments enter through the feed inlet of the feed hopper 14, the vibrating motor 13 drives the screening hopper 11 to shake, causing the plastic fragments to be screened sequentially through the screen 12. At this time, the plastic fragments can flow out normally through the gap between the sealing plate 21 and the screen 12. When too many plastic fragments enter the feed hopper 14, the plastic fragments will pile up. At this time, the sealing plate 21 will block the upper layer of plastic fragments, while the lower layer of plastic fragments will flow out through the gap between the sealing plate 21 and the screen 12 through the vibration of the vibrating motor 13. The plastic fragments blocked by the sealing plate 21 will push the sealing plate 21 to slide in the sliding groove 23 and stretch the first elastic element 24. During the movement, the sealing plate 21 can drive the transmission shaft 27 to rotate through the meshing of two gears 28 and the corresponding rack 210. When the transmission shaft 27 rotates, it can drive multiple ratchet wheels 216 to rotate synchronously. When the ratchet wheels 216 rotate, they pass through the locking teeth 220. The limiting position causes the cam 217 to rotate synchronously. When the cam 217 rotates, it pushes the limiting plate 214 to move and compresses the second elastic element 213. After the cam 217 rotates once, the second elastic element 213 pushes the limiting plate 214 to fall from the highest point of the cam 217, and at the same time, the striking plate 215 strikes the sealing plate 21 near the screen 12, causing the plastic fragments behind the sealing plate 21 to be shaken apart. When the plastic fragments behind the sealing plate 21 are insufficient to push the sealing plate 21 to move, the stretched first elastic element 24 rebounds and drives the sealing plate 21 to move. During the movement of the sealing plate 21, the meshing of the two gears 28 with the corresponding rack 210 drives the transmission shaft 27 to reverse. When the ratchet 216 reverses, the locking tooth 220 no longer limits the ratchet 216, so it cannot drive the cam 217 to reverse. When there are too many plastic fragments in the feed bin 14, the above steps will continue.

[0030] By setting up the material handling component 2, when too many plastic fragments enter the feeding hopper 14, the plastic fragments will push the sealing plate 21 to slide and stretch the first elastic element 24, causing the two gears 28 to drive the transmission shaft 27 and multiple ratchet 216 to rotate. When the ratchet 216 rotates, the cam 217 will rotate synchronously through the limiting of the locking teeth 220. When the cam 217 rotates, it will push the limiting plate 214 to move and compress the second elastic element 213. After the cam 217 rotates once, the second elastic element 213 will push the limiting plate 214 to fall from the highest point of the cam 217, and at the same time, the striking plate 215 will strike the sealing plate 21, causing the sealing plate 21 to... The plastic fragments behind the sealing plate 21 are shaken apart. On the other hand, when the plastic fragments behind the sealing plate 21 are insufficient to push the sealing plate 21 to move, the stretched first elastic element 24 rebounds and drives the sealing plate 21 to move. During the movement of the sealing plate 21, the meshing of the two gears 28 with the corresponding rack 210 drives the transmission shaft 27 to reverse. When the ratchet 216 reverses, the locking tooth 220 no longer limits the ratchet 216, so it cannot drive the cam 217 to reverse. When there are too many plastic fragments in the feed bin 14, the above steps will continue to work, so that the plastic fragments are screened more effectively and the working efficiency during screening is improved.

[0031] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 multi-stage screening device for recycled plastic fragments, comprising a support frame (1), a screening chamber (11) provided on the support frame (1), a stepped screen (12) provided inside the screening chamber (11), a vibration motor (13) provided outside the screening chamber (11), a feeding chamber (14) provided above the screening chamber (11), and a finished product outlet (15) and a circulating outlet (16) provided below the screening chamber (11), characterized in that, The outside of the feed hopper (14) is provided with a stacking and processing assembly (2); The material handling assembly (2) includes a sealing plate (21), which is located at the side outlet of the feed hopper (14). The feed hopper (14) is fixedly connected to two sides with symmetrically arranged fixing blocks (22). Each fixing block (22) has a sliding groove (23). Both sides of the sealing plate (21) slide in the corresponding sliding groove (23). A first elastic element (24) is provided between the end of the sealing plate (21) near the feed hopper (14) and the corresponding sliding groove (23).

2. The multi-stage screening device for recycled plastic fragments according to claim 1, characterized in that: Each sealing plate (21) has a connecting block (25) fixedly connected to the side away from the first elastic member (24) and slidingly connected in the corresponding sliding groove (23). Each connecting block (25) has an avoidance groove (26).

3. The multi-stage screening device for recycled plastic fragments according to claim 2, characterized in that: A drive shaft (27) is rotatably connected between the two connecting blocks (25), and gears (28) located in the clearance groove (26) are fixedly connected to both ends of the drive shaft (27).

4. The multi-stage screening device for recycled plastic fragments according to claim 3, characterized in that: Each of the fixed blocks (22) has a connection port (29) corresponding to the gear (28), and a rack (210) is fixedly connected in each connection port (29). Each gear (28) meshes with the corresponding rack (210).

5. The multi-stage screening device for recycled plastic fragments according to claim 4, characterized in that: The outer side of the drive shaft (27) is provided with a fixed cover (211) that is fixedly connected to the sealing plate (21), and a sliding plate (212) is slidably connected inside the fixed cover (211).

6. The multi-stage screening device for recycled plastic fragments according to claim 5, characterized in that: The sliding plate (212) is connected to the fixed cover (211) by a plurality of second elastic elements (213), and a limit plate (214) and a striking plate (215) are fixedly connected to one end of the sliding plate (212) away from the second elastic elements (213).

7. The multi-stage screening device for recycled plastic fragments according to claim 6, characterized in that: The outer wall of the drive shaft (27) is fixedly connected with a plurality of ratchet wheels (216) arranged at equal intervals. Each ratchet wheel (216) is rotatably connected to a cam (217) on its outer side. One end of the limiting plate (214) is in contact with one side of the plurality of cams (217).

8. The multi-stage screening device for recycled plastic fragments according to claim 7, characterized in that: Each cam (217) has a mounting groove (218) on both sides, and a fixing post (219) is provided in the mounting groove (218) on both sides of each cam (217). Each fixing post (219) is rotatably connected with a locking tooth (220), and each locking tooth (220) is connected to the corresponding fixing post (219) by a torsion spring.

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