Plastic crusher for plastic recovery

Abstract

The utility model relates to the technical field of plastic crushers, in particular to a plastic crusher for plastic recovery, which comprises a frame and a crushing box fixedly arranged on the frame, a crushing structure is arranged in the crushing box, and one surface of the crushing box extends outwards to be provided with a conveying belt device for feeding into the crushing box; extrusion plates are symmetrically arranged on the two sides of the interior of the crushing box, the extrusion plates are connected with a pushing mechanism, and the pushing mechanism is used for driving the extrusion plates on the two sides to be close to and away from each other in a reciprocating mode so as to flatten materials located above the crushing structure; the crushing structure, the conveying belt device and the pushing mechanism are connected and matched with one another, and when the conveying belt device conveys materials into the crushing box, the pushing mechanism is kept still; in the process that the pushing mechanism drives the extrusion plates on the two sides to get close to each other and get away from each other, the conveying belt device is kept static, then extrusion before plastic materials are crushed is achieved, the plastic materials such as plastic bottles are extruded to become flat, and therefore crushing of the plastic materials is facilitated, and the crushing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic crushers, and particularly relates to a plastic crusher for plastic recycling. Background Art

[0002] Since the natural degradation time of ordinary plastic waste is very long, and a large amount of harmful substances such as methane are generated during the degradation process, the recycling and utilization of plastic products is currently the best way to solve the plastic waste problem. In the process of plastic recycling, plastic crushers are often used.

[0003] Common plastic wastes include plastic bags, plastic bottles, plastic cups, plastic boxes, etc. Most plastic wastes are soft wastes, and the resistance during the crushing process of conventional plastic crushers is not too large; however, for the crushing of some bottle-shaped, especially hard plastic bottles, due to their smooth bottle diameter, they are prone to slipping when falling between the crushing rollers of the crusher. During the recycling and crushing of plastic bottles, slipping easily causes the plastic bottles to fly everywhere in the crushing box, increasing the working risk, and at the same time, it is not conducive to the rapid crushing treatment of plastic bottles, resulting in low crushing efficiency during plastic recycling. For this reason, we propose a plastic crusher for plastic recycling to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a plastic crusher for plastic recycling to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A plastic crusher for plastic recycling, including a frame and a crushing box fixedly arranged on the frame. A crushing structure is arranged inside the crushing box, and a conveyor belt device is arranged on one side of the crushing box and extends outward for feeding materials into the crushing box;

[0007] Extrusion plates are symmetrically arranged on both sides inside the crushing box. The extrusion plates are connected to a pushing mechanism, and the pushing mechanism is used to drive the two extrusion plates to reciprocally approach and move away from each other to flatten the materials located above the crushing structure;

[0008] The crushing structure, the conveyor belt device, and the pushing mechanism are connected and cooperate with each other. When the conveyor belt device conveys materials into the crushing box, the pushing mechanism remains stationary; when the pushing mechanism drives the two extrusion plates to approach and move away from each other, the conveyor belt device remains stationary.

[0009] A plastic crusher for plastic recycling as described above: the crushing structure includes a first crushing roller and a second crushing roller rotatably arranged in a crushing box through bearings, and the first crushing roller and the second crushing roller are respectively connected by a driving gear and a driven gear fixed at their ends to maintain reverse transmission between the two.

[0010] A plastic crusher for plastic recycling as described above: a main shaft, a first secondary shaft, and a second secondary shaft are rotatably mounted on the frame and on both sides of the crushing box through bearings, the first secondary shaft and the second secondary shaft are connected by a first pulley transmission mechanism, and the main shaft and the driving gear are connected by a second pulley transmission mechanism;

[0011] A third secondary shaft is rotatably mounted on the frame via a bearing, and the third secondary shaft, the first secondary shaft and the main shaft are intermittently connected through a Maltese cross movement assembly.

[0012] A plastic crusher for plastic recycling as described above: one of the main shafts is driven to rotate by a motor fixed on a frame, the output end of the motor is connected to the main shaft through a coupling, and the two main shafts are connected through a sprocket transmission mechanism;

[0013] The sprocket transmission mechanism comprises sprockets respectively fixed on two main shafts, and the two sprockets are connected by chain transmission.

[0014] A plastic crusher for plastic recycling as described above: the first pulley transmission mechanism includes a first driving pulley fixed on the first secondary shaft and a first driven pulley fixed on the second secondary shaft, and the first driving pulley and the first driven pulley are connected by a first transmission belt.

[0015] A plastic crusher for plastic recycling as described above: the second pulley transmission mechanism includes a second driving pulley fixed on one side of the driving gear and a second driven pulley fixed on the main shaft, and the second driving pulley and the second driven pulley are connected by a second transmission belt.

[0016] A plastic crusher for plastic recycling as described above: the pushing mechanism includes a crank fixed on the second secondary shaft, a connecting rod is hinged on the crank, a connecting plate is hinged at one end of the connecting rod, two limiting slide bars that penetrate and are inserted into the crushing box shell are fixed on the connecting plate, and the limiting slide bar is fixedly connected to the extrusion plate.

[0017] A plastic crusher for plastic recycling as described above: The conveyor belt device includes a fixed frame fixedly arranged on the frame. Two conveyor belt rollers are rotatably installed on the fixed frame through bearings. A conveyor belt extending to the inside of the crushing box is drivingly connected to the conveyor belt rollers. A transmission mechanism is arranged between the conveyor belt device and the third auxiliary shaft to drive the conveyor belt rollers to rotate and drive the conveyor belt to roll.

[0018] A plastic crusher for plastic recycling as described above: The transmission mechanism includes a fourth auxiliary shaft rotatably installed on the fixed frame through a bearing. The fourth auxiliary shaft and the third auxiliary shaft are drivingly connected through a third pulley transmission mechanism. The fourth auxiliary shaft and the conveyor belt rollers are drivingly connected through a bevel gear transmission mechanism;

[0019] The third pulley transmission mechanism includes a third driving pulley fixed on the third auxiliary shaft and a third driven pulley fixed on the fourth auxiliary shaft. The third driving pulley and the third driven pulley are drivingly connected through a third transmission belt;

[0020] The bevel gear transmission mechanism includes a driving bevel gear fixed at one end of the fourth auxiliary shaft and a driven bevel gear fixed at one end of the conveyor belt roller and meshing and drivingly connected with the driving bevel gear.

[0021] A plastic crusher for plastic recycling as described above: The Maltese cross core component includes a driving wheel fixed on the main shaft, a first driven wheel fixed on the first auxiliary shaft, and a second driven wheel fixed on the third auxiliary shaft. A convex rod is fixed on the driving wheel. Four first grooves are equidistantly arranged on the edge of the first driven wheel. Four second grooves are equidistantly arranged on the edge of the second driven wheel. The convex rod is movably clamped and matched with the first groove and the second groove respectively.

[0022] Compared with the prior art, the beneficial effects of the present utility model are: The conveyor belt device provided is used for feeding materials into the crushing box;

[0023] By symmetrically arranging extrusion plates on both sides inside the crushing box, the extrusion plates are connected to a pushing mechanism. The pushing mechanism is used to drive the extrusion plates on both sides to reciprocally approach and move away from each other to flatten the materials located above the crushing structure;

[0024] Through the intermittent transmission structure, the crushing structure, the conveyor belt device, and the pushing mechanism are interconnected and cooperated with each other. When the conveyor belt device conveys materials into the crushing box, the pushing mechanism remains stationary; when the pushing mechanism drives the extrusion plates on both sides to approach and move away from each other, the conveyor belt device remains stationary, thereby realizing the extrusion of plastic materials before crushing, flattening plastic materials such as plastic bottles, which is beneficial to the crushing of plastic materials and improves the crushing efficiency. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the overall structure of a plastic crusher for plastic recycling.

[0026] Figure 2 It is a schematic diagram of the structure with a partial removal of the crushing box of a plastic crusher for plastic recycling.

[0027] Figure 3 It is an exploded view of the structure of the transmission mechanism of a plastic crusher for plastic recycling.

[0028] Figure 4 It is a schematic diagram of the structure after the conveyor belt device and the transmission mechanism of a plastic crusher for plastic recycling are detached.

[0029] Figure 5 It is a schematic diagram of the mating connection between the main shaft, the first auxiliary shaft, the second auxiliary shaft, the third auxiliary shaft, and the extrusion plate of a plastic crusher for plastic recycling.

[0030] In the figure: 1. Frame; 2. Crushing box; 201. Feeding trough; 202. Baffle; 3. First crushing roller; 31. Driving gear; 4. Second crushing roller; 41. Driven gear; 5. Conveyor belt device; 51. Fixed frame; 52. Conveyor belt roller; 53. Conveyor belt; 6. Main shaft; 7. Motor; 8. First auxiliary shaft; 9. Second auxiliary shaft; 10. Third auxiliary shaft; 11. Extrusion plate; 121. Crank; 122. Connecting rod; 123. Connecting plate; 124. Limit slide bar; 131. First driving pulley; 132. First driven pulley; 133. First transmission belt; 141. Second driving pulley; 142. Second driven pulley; 143. Second transmission belt; 151. Driving wheel; 1511. Convex rod; 152. First driven wheel; 1521. First groove; 153. Second driven wheel; 1531. Second groove; 16. Fourth auxiliary shaft; 171. Third driving pulley; 172. Third driven pulley; 173. Third transmission belt; 181. Driving bevel gear; 182. Driven bevel gear; 191. Sprocket; 192. Chain. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] Please refer to Figures 1 to 5 , as an embodiment of the present invention, a plastic crusher for plastic recycling includes a frame 1 and a crushing box 2 fixedly arranged on the frame 1. A crushing structure is arranged inside the crushing box 2, and a conveyor belt device 5 is extended outward from one side of the crushing box 2 for feeding materials into the inside of the crushing box 2;

[0033] On both inner sides of the crushing box 2, pressing plates 11 are symmetrically arranged. The pressing plates 11 are connected to a pushing mechanism, and the pushing mechanism is used to drive the pressing plates 11 on both sides to reciprocally approach and move away from each other, so as to flatten the material located above the crushing structure.

[0034] The crushing structure, the conveyor belt device 5, and the pushing mechanism are interconnected and cooperate with each other. When the conveyor belt device 5 conveys the material into the crushing box 2, the pushing mechanism remains stationary; when the pushing mechanism drives the pressing plates 11 on both sides to approach and move away from each other, the conveyor belt device 5 remains stationary.

[0035] In this embodiment, the plastic bottles input from above the crushing box 2 can be crushed by the provided crushing structure; in addition, by arranging two pressing plates 11 in the crushing box 2 to reciprocally approach and move away from each other, and in cooperation with the intermittent conveyance of the material by the conveyor belt device 5, the plastic material intermittently conveyed above the crushing structure is flattened before crushing. The plastic bottle material between the two pressing plates 11 is flattened due to the squeezing force of the pressing plates 11 on both sides, which is beneficial for crushing.

[0036] As a further solution of the present utility model, the crushing structure includes a first crushing roller 3 and a second crushing roller 4 rotatably arranged in the crushing box 2 through bearings. The first crushing roller 3 and the second crushing roller 4 are respectively in meshing transmission connection through a driving gear 31 and a driven gear 41 fixed to their ends, and keep the two rotating in opposite directions.

[0037] In this embodiment, during the process of the driving gear 31 and the driven gear 41 rotating in opposite directions, the first crushing roller 3 and the second crushing roller 4 are driven to rotate in opposite directions, so that the plastic material falling between them is crushed by the relative rotation of the first crushing roller 3 and the second crushing roller 4.

[0038] As a further solution of the present utility model, on the frame 1 and on both sides of the crushing box 2, a main shaft 6, a first auxiliary shaft 8, and a second auxiliary shaft 9 are respectively rotatably installed through bearings. The first auxiliary shaft 8 and the second auxiliary shaft 9 are in transmission connection through a first belt transmission mechanism. The main shaft 6 and the driving gear 31 are in transmission connection through a second belt transmission mechanism;

[0039] On the frame 1, a third auxiliary shaft 10 is rotatably installed through a bearing. The third auxiliary shaft 10, the first auxiliary shaft 8, and the main shaft 6 are in intermittent transmission connection through a Maltese cross movement component.

[0040] In this embodiment, the rotation of the main shaft 6 can drive the driving gear 31 to rotate synchronously, the rotation of the main shaft 6 can intermittently drive the first auxiliary shaft 8 and the second auxiliary shaft 9 to rotate synchronously, and the rotation of the main shaft 6 can intermittently drive the third auxiliary shaft 10 to rotate synchronously.

[0041] As a further solution of the utility model, one of the main shafts 6 is driven to rotate by a motor 7 fixed on the frame 1, the output end of the motor 7 is connected to the main shaft 6 through a coupling, and the two main shafts 6 are connected through a sprocket transmission mechanism;

[0042] The sprocket transmission mechanism includes sprockets 191 respectively fixed on the two main shafts 6 , and the two sprockets 191 are connected by a chain 192 .

[0043] It should be noted that one of the main shafts 6 is driven to rotate by the motor 7, and the transmission ratio between the two sprockets 191 connected by the chain 192 is 1:1, so the transmission ratio between the two main shafts 6 connected by the sprocket transmission mechanism is basically 1:1.

[0044] As a further solution of the utility model, the first pulley transmission mechanism includes a first driving pulley 131 fixed on the first secondary shaft 8 and a first driven pulley 132 fixed on the second secondary shaft 9. The first driving pulley 131 and the first driven pulley 132 are connected through a first transmission belt 133.

[0045] It should be noted that the transmission ratio between the first driving pulley 131 and the first driven pulley 132 connected by the first transmission belt 133 is 4:1, so the transmission ratio between the first secondary shaft 8 and the second secondary shaft 9 connected by the first pulley transmission mechanism is basically 4:1.

[0046] As a further solution of the utility model, the second pulley transmission mechanism includes a second driving pulley 141 fixed to one side of the driving gear 31 and a second driven pulley 142 fixed on the main shaft 6, and the second driving pulley 141 and the second driven pulley 142 are connected through a second transmission belt 143.

[0047] It should be noted that the transmission ratio between the second driving pulley 141 and the second driven pulley 142 connected by the second transmission belt 143 is 1:1, so the transmission ratio between the main shaft 6 and the first crushing roller 3 connected by the second pulley transmission mechanism is basically 1:1.

[0048] As a further solution of the utility model, the pushing mechanism includes a crank 121 fixed on the second secondary shaft 9, a connecting rod 122 is hinged on the crank 121, a connecting plate 123 is hinged at one end of the connecting rod 122, and two limiting slide bars 124 are fixed on the connecting plate 123 and are arranged to penetrate and insert into the shell of the crushing box 2, and the limiting slide bar 124 is fixedly connected to the extrusion plate 11.

[0049] In this embodiment, the rotation of the second countershaft 9 drives the crank 121 to rotate synchronously. During this process, the connecting rod 122 is driven to rotate, and then the limiting slide bar 124 is driven to move back and forth along the radial direction of the limiting slide bar 124, so as to extrude and crush the plastic material that is about to fall on the first crushing roller 3 and the second crushing roller 4.

[0050] As a further solution of the present utility model, the conveyor belt device 5 includes a fixed frame 51 fixedly arranged on the frame 1. Two conveyor belt rollers 52 are rotatably installed on the fixed frame 51 through bearings. A conveyor belt 53 extending to the inside of the crushing box 2 is drivingly connected to the conveyor belt rollers 52. A transmission mechanism is arranged between the conveyor belt device 5 and the third countershaft 10 to drive the conveyor belt rollers 52 to rotate and drive the conveyor belt 53 to roll.

[0051] In this embodiment, a feed slot 201 is formed on the crushing box 2. One end of the conveyor belt 53 extends into the feed slot 201. The third countershaft 10 drives the conveyor belt rollers 52 to rotate through the transmission mechanism, and then drives the conveyor belt 53 to roll by the driving connection between the conveyor belt rollers 52 and the conveyor belt 53, so as to convey the plastic material into the crushing box 2 through the conveyor belt 53.

[0052] As a further solution of the present utility model, the transmission mechanism includes a fourth countershaft 16 rotatably installed on the fixed frame 51 through a bearing. The fourth countershaft 16 and the third countershaft 10 are drivingly connected through a third belt pulley transmission mechanism. The fourth countershaft 16 and the conveyor belt roller 52 are drivingly connected through a bevel gear transmission mechanism;

[0053] The third belt pulley transmission mechanism includes a third driving belt pulley 171 fixed on the third countershaft 10 and a third driven belt pulley 172 fixed on the fourth countershaft 16. The third driving belt pulley 171 and the third driven belt pulley 172 are drivingly connected through a third transmission belt 173;

[0054] The bevel gear transmission mechanism includes a driving bevel gear 181 fixed at one end of the fourth countershaft 16 and a driven bevel gear 182 fixed at one end of the conveyor belt roller 52 and meshing with the driving bevel gear 181 for driving connection.

[0055] In this embodiment, the rotation of the third countershaft 10 drives the third driving belt pulley 171 to rotate, and then drives the third driven belt pulley 172 to rotate, thereby driving the fourth countershaft 16 to rotate, thereby driving the driving bevel gear 181 to rotate synchronously. Then, the driving bevel gear 181 and the driven bevel gear 182 are meshed and drivingly connected to drive the driven bevel gear 182 to rotate, thereby driving the conveyor belt roller 52 to rotate.

[0056] It should be noted that the transmission ratio between the third driving pulley 171 and the third driven pulley 172 which are transmission-connected by the third transmission belt 173 is 1:1. Therefore, the transmission ratio between the third countershaft 10 and the fourth countershaft 16 which are transmission-connected by the third pulley transmission mechanism is basically 1:1, and the transmission ratio between the driving bevel gear 181 and the driven bevel gear 182 is 1:1. Therefore, the transmission ratio between the fourth countershaft 16 and the conveyor belt roller 52 is basically 1:1.

[0057] As a further solution of the present utility model, the Maltese cross movement component includes a driving wheel 151 fixed on the main shaft 6, a first driven wheel 152 fixed on the first countershaft 8, and a second driven wheel 153 fixed on the third countershaft 10. A convex rod 1511 is fixed on the driving wheel 151. Four first grooves 1521 are equidistantly arranged on the edge of the first driven wheel 152, and four second grooves 1531 are equidistantly arranged on the edge of the second driven wheel 153. The convex rod 1511 is respectively movably clamped and matched with the first groove 1521 and the second groove 1531.

[0058] In this embodiment, the rotation of the main shaft 6 drives the driving wheel 151 to rotate synchronously. By using the movable clamping and matching of the convex rod 1511 with the first groove 1521 and the second groove 1531 respectively, when the driving wheel 151 rotates one circle, it drives the first driven wheel 152 and the second driven wheel 153 to rotate 90° respectively. And when the first driven wheel 152 rotates, the second driven wheel 153 is stationary, and when the second driven wheel 153 rotates, the first driven wheel 152 is stationary. Thus, when the first countershaft 8 is driven to rotate, the third countershaft 10 is stationary, and when the third countershaft 10 rotates, the first countershaft 8 is stationary. Thus, the main shaft 6 can intermittently drive the first countershaft 8 and the third countershaft 10 to rotate, so that when the conveyor belt device 5 conveys materials into the crushing box 2, the pushing mechanism remains stationary; when the pushing mechanism drives the two side pressing plates 11 to approach and move away from each other, the conveyor belt device 5 remains stationary.

[0059] Finally, in order to ensure that the plastic materials will not fall from the gap between the crushing structure and the inner wall of the crushing box 2 when they fall above the crushing structure, inclined downward baffle plates 202 are installed on the inner walls of both sides of the crushing box 2 and above the crushing structure to directly guide the materials to the crushing structure.

[0060] The working principle of this utility model is that plastic materials are conveyed into the interior of the crushing box 2 through the conveyor belt device 5. On both sides inside the crushing box 2, pressing plates 11 are symmetrically arranged. The pressing plates 11 are connected to the pushing mechanism, and the pushing mechanism drives the two side pressing plates 11 to reciprocally approach and move away from each other to flatten the materials reaching above the crushing structure.

[0061] In addition, when the conveyor belt device 5 conveys materials into the crushing box 2, the pushing mechanism remains stationary; during the process of the pushing mechanism driving the pressing plates 11 on both sides to approach and move away from each other, the conveyor belt device 5 remains stationary, thereby realizing intermittent feeding and extrusion of plastic materials before crushing, so that plastic materials such as plastic bottles are flattened by extrusion, which is beneficial to the crushing of plastic materials and improves the crushing efficiency.

[0062] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of the present invention, all technical solutions that can implement the present invention in other specific forms are included in the present invention.

Claims

1. A plastic crusher for recycling plastics, comprising a frame (1) and a crushing box (2) fixedly arranged on the frame (1), wherein a crushing structure is arranged in the crushing box (2), characterized in that: A conveyor belt device (5) is provided on one side of the crushing box (2) extending outwards and used for feeding materials into the crushing box (2); Extrusion plates (11) are symmetrically arranged on both sides of the crushing box (2), and the extrusion plates (11) are connected to a pushing mechanism, and the pushing mechanism is used to drive the extrusion plates (11) on both sides to move toward and away from each other reciprocatingly, so as to flatten the material located above the crushing structure; The crushing structure, the conveyor belt device (5) and the pushing mechanism are interconnected and coordinated with each other. When the conveyor belt device (5) conveys materials into the crushing box (2), the pushing mechanism remains stationary; when the pushing mechanism drives the extrusion plates (11) on both sides to move closer to and away from each other, the conveyor belt device (5) remains stationary.

2. A plastic crusher for plastic recycling according to claim 1, characterized in that: The crushing structure comprises a first crushing roller (3) and a second crushing roller (4) which are rotatably arranged in a crushing box (2) via bearings; the first crushing roller (3) and the second crushing roller (4) are respectively connected in meshing transmission via a driving gear (31) and a driven gear (41) fixed at their ends, so as to maintain reverse transmission between the two.

3. A plastic crusher for plastic recycling according to claim 2, characterized in that: A main shaft (6), a first secondary shaft (8), and a second secondary shaft (9) are rotatably mounted on the frame (1) and located on both sides of the crushing box (2) via bearings; the first secondary shaft (8) and the second secondary shaft (9) are connected to each other via a first belt pulley transmission mechanism; and the main shaft (6) and the driving gear (31) are connected to each other via a second belt pulley transmission mechanism; A third secondary shaft (10) is rotatably mounted on the frame (1) via a bearing, and the third secondary shaft (10), the first secondary shaft (8) and the main shaft (6) are intermittently connected via a Maltese cross movement assembly.

4. A plastic crusher for plastic recycling according to claim 3, characterized in that: One of the main shafts (6) is driven to rotate by a motor (7) fixed on the frame (1); the output end of the motor (7) is connected to the main shaft (6) via a coupling; and the two main shafts (6) are connected via a sprocket transmission mechanism; The sprocket transmission mechanism comprises sprockets (191) respectively fixed on two main shafts (6), and the two sprockets (191) are connected by a chain (192).

5. A plastic crusher for plastic recycling according to claim 3, characterized in that: The first pulley transmission mechanism comprises a first driving pulley (131) fixed on the first secondary shaft (8) and a first driven pulley (132) fixed on the second secondary shaft (9); the first driving pulley (131) and the first driven pulley (132) are connected in transmission via a first transmission belt (133).

6. A plastic crusher for plastic recycling according to claim 3, characterized in that: The second pulley transmission mechanism comprises a second driving pulley (141) fixed on one side of the driving gear (31) and a second driven pulley (142) fixed on the main shaft (6); the second driving pulley (141) and the second driven pulley (142) are connected in transmission via a second transmission belt (143).

7. A plastic crusher for plastic recycling according to claim 3, characterized in that: The pushing mechanism comprises a crank (121) fixed on the second secondary shaft (9), a connecting rod (122) being hinged on the crank (121), a connecting plate (123) being hinged on one end of the connecting rod (122), two limiting slide bars (124) being fixed on the connecting plate (123) and penetrating the shell of the crushing box (2), and the limiting slide bars (124) are fixedly connected to the extrusion plate (11).

8. A plastic crusher for plastic recycling according to claim 3, characterized in that: The conveyor belt device (5) comprises a fixed frame (51) fixedly arranged on the frame (1), two conveyor belt rollers (52) are rotatably mounted on the fixed frame (51) via bearings, the conveyor belt rollers (52) are drivingly connected to a conveyor belt (53) extending to the inner side of the crushing box (2), and a transmission mechanism is arranged between the conveyor belt device (5) and the third secondary shaft (10) for driving the conveyor belt rollers (52) to rotate and drive the conveyor belt (53) to roll.

9. A plastic crusher for plastic recycling according to claim 8, characterized in that: The transmission mechanism comprises a fourth secondary shaft (16) rotatably mounted on a fixed frame (51) via a bearing, the fourth secondary shaft (16) and the third secondary shaft (10) are connected to each other via a third pulley transmission mechanism, and the fourth secondary shaft (16) and the conveyor belt roller (52) are connected to each other via a bevel gear transmission mechanism; The third pulley transmission mechanism comprises a third driving pulley (171) fixed on the third secondary shaft (10) and a third driven pulley (172) fixed on the fourth secondary shaft (16); the third driving pulley (171) and the third driven pulley (172) are connected to each other by a third transmission belt (173); The bevel gear transmission mechanism comprises a driving bevel gear (181) fixed to one end of the fourth secondary shaft (16) and a driven bevel gear (182) fixed to one end of the conveyor belt roller (52) and meshingly connected to the driving bevel gear (181).

10. A plastic crusher for plastic recycling according to claim 3, characterized in that: The Maltese cross movement assembly comprises a driving wheel (151) fixed on a main shaft (6), a first driven wheel (152) fixed on a first secondary shaft (8), and a second driven wheel (153) fixed on a third secondary shaft (10); a convex rod (1511) is fixed on the driving wheel (151); four first grooves (1521) are formed at equal intervals on the edge of the first driven wheel (152); four second grooves (1531) are formed at equal intervals on the edge of the second driven wheel (153); the convex rod (1511) is movably engaged with the first groove (1521) and the second groove (1531) respectively.

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