Plastic product crushing device

Abstract

The invention relates to the technical field of plastic recovery, in particular to a plastic product crushing device which comprises a crushing box, an extrusion mechanism for extruding plastic products before crushing, a pushing mechanism for pushing extruded plastic parts to be crushed and a crushing mechanism for crushing the plastic parts. According to the plastic product crushing device disclosed by the invention, the extrusion mechanism is arranged, so that materials conveyed into the crushing box can be equivalently discharged; extrusion forming is performed before crushing after blanking; and when the materials are pressed down and formed, a worker does not need to suspend the feeding mechanism, and the upper end of the extrusion plate can still continue to receive the materials, so that unnecessary loss caused by shutdown when the pushing mechanism pushes the materials is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic recycling, and in particular to a plastic product crushing device. Background Art

[0002] With the continuous development of science and technology, plastic products are becoming more and more common in various applications, and they are of various types and materials. Especially for plastic products with cavity structures or smooth surfaces, such as plastic bottles, plastic containers, plastic boxes, plastic pipes and plastic shells, these products are often difficult to be effectively crushed by the crushing roller during the crushing process; in view of this, before actual operation, these plastic products need to be carefully classified and crushed separately to improve the crushing efficiency; but this not only prolongs the work process, but also significantly increases the complexity of the operation and labor costs.

[0003] Patent application CN202223032837.3 discloses a plastic crusher, including a crushing box, wherein a crushing chamber is provided inside the crushing box, a partition is fixedly connected inside the crushing chamber, and an inclined discharge port is provided on the upper surface of the partition; a flattening mechanism is provided inside the crushing chamber, and the flattening mechanism includes a pressing plate, and a convex tooth is provided on the right side of the pressing plate, and a limit plate is fixedly connected to the left side of the pressing plate; the crushing mechanism includes a crushing roller, a rotating shaft and a diverter block, and a crushing rod is fixedly connected to the side surface of the rotating shaft. Through the above structure, the concave-convex plastic can be flattened by using the pressing plate and the convex tooth, and the flattened material will fall between the two crushing rollers through the discharge port, and be crushed by the crushing roller. The crushed plastic will then fall onto the crushing rod and be crushed for the second time by the crushing stem. The double crushing can make the plastic crushed more thoroughly, thereby improving the practicality of the device.

[0004] This patent can flatten the plastic before crushing it during feeding, thereby improving work efficiency. However, when flattening the plastic, the feeding mechanism can only stop feeding. The feeding mechanism can only continue feeding after the flattening mechanism flattens the plastic, thereby greatly increasing the working time.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the invention

[0006] The object of the present invention is to provide a plastic product crushing device which can effectively solve the above technical problems.

[0007] In order to achieve the purpose of the present invention, the following technical scheme is adopted:

[0008] A plastic product crushing device, comprising: a crushing box, an extrusion mechanism for squeezing the plastic product before crushing, a pushing mechanism for pushing the extruded plastic piece for crushing, and a crushing mechanism for crushing the plastic piece;

[0009] The extrusion mechanism includes: an extrusion plate for receiving and extruding the plastic product, a cylinder 1 for driving the pressure plate to extrude the plastic product, and a hinged rod hinged to the extrusion plate; a guide groove provided on the crushing box, and an elastic component provided between the extrusion plate and the hinged rod; the cylinder 1 is fixedly installed on the top of the crushing box; the telescopic rod of the cylinder 1 is fixedly connected to the hinged rod; and the extrusion plate is slidably installed in the guide groove.

[0010] Furthermore, the guide groove is composed of an extrusion guide groove and a turnover guide groove; and a wave groove is formed on the side wall of the turnover guide groove.

[0011] Furthermore, the elastic component includes: an arc-shaped sleeve rod fixedly installed on the hinge rod, an arc-shaped pull rod slidably installed in the arc-shaped sleeve rod, and a second spring for driving the arc-shaped pull rod to return to its original position.

[0012] Furthermore, a puncturing mechanism is also provided at the bottom of the crushing box;

[0013] The piercing mechanism includes: a nail plate fixedly installed at the bottom of the crushing box, a pressure plate slidably installed on the nail plate, a reset spring that drives the pressure plate to reset, and a reset component that prevents the pressure plate from getting stuck; the pressure plate is provided with nail holes for the nails on the nail plate to pass through.

[0014] Furthermore, it is characterized in that the reset assembly includes: a piston ring sleeved on the arc-shaped pull rod, a cavity one opened in the arc-shaped sleeve rod, a cavity two opened at the bottom of the nail plate, a cavity three, a piston one slidably installed in the cavity two and cavity three, a piston two, and a lifting rod slidably installed in the cavity three; the piston one is fixedly connected to the piston two; the cavity one is connected to the cavity two through a hose.

[0015] Furthermore, the pushing mechanism includes: a pushing plate for pushing the plastic product, a second cylinder for driving the pushing plate to move, and a knocking component for knocking the extrusion plate synchronously with the movement of the second cylinder.

[0016] Furthermore, the knocking assembly includes: a wave guide groove opened on the side wall of the crushing box, a knocking plate slidably installed in the push plate, and a rubber block fixedly installed on the knocking plate; the knocking plate is slidably installed in the wave guide groove.

[0017] Furthermore, the crushing mechanism includes: a crushing roller, a motor driving the crushing roller to rotate, and a screening screen for screening the crushed plastic fragments; the crushing roller is rotatably installed on the crushing box; and the screening screen is detachably connected to the crushing box.

[0018] Compared with the prior art, the present invention has the following beneficial effects: a plastic product crushing device of the present invention can realize equal feeding of materials transported to the crushing box by setting an extrusion mechanism; after feeding, the materials are extruded and formed before being crushed; and when the materials are pressed down to form, the staff does not need to pause the feeding mechanism, and the upper end of the extrusion plate can continue to receive the materials, thereby effectively reducing unnecessary losses caused by shutdown of the pushing mechanism when pushing materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] Figure 1 It is a structural schematic diagram of a plastic product crushing device in the present invention;

[0021] Figure 2 It is a cross-sectional view of a plastic product crushing device in the present invention;

[0022] Figure 3 It is an axial side cross-sectional view of a plastic product crushing device in the present invention;

[0023] Figure 4 It is a structural schematic diagram of the extrusion mechanism in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the pushing mechanism in the present invention;

[0025] Figure 6 It is a cross-sectional view of the crushing box in the present invention;

[0026] Figure 7 It is a structural schematic diagram of the reset component in the present invention;

[0027] Figure 8 It is a partial enlarged view of the reset component in the present invention;

[0028] Fig. 9 It is an internal cross-sectional view of the elastic component in the present invention.

[0029] In the figure: 1, crushing box; 2, extrusion mechanism; 3, pushing mechanism; 4, crushing mechanism; 21, extrusion plate; 22, cylinder 1; 23, hinged rod; 24, guide groove; 25, elastic component; 241, extrusion guide groove; 242, flip guide groove; 243, wave groove; 251, arc sleeve rod; 252, arc pull rod; 253, spring 2; 11, piercing mechanism; 111, nail plate; 112, pressure plate; 113, reset spring Spring 1; 114, reset assembly; 115, nail hole; 1141, piston ring; 1142, cavity 1; 1143, cavity 2; 1144, cavity 3; 1145, piston 1; 1146, piston 2; 1147, lifting rod; 1148, hose; 31, push plate; 32, cylinder 2; 331, wave guide groove; 332, knocking plate; 333, rubber block; 41, crushing roller; 42, motor; 43, sub-screen. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments.

[0031] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] like Figures 1 to 9 As shown, a plastic product crushing device of the present invention comprises: a crushing box 1, an extrusion mechanism 2 for extruding the plastic product before crushing, a pushing mechanism 3 for pushing the extruded plastic parts for crushing, and a crushing mechanism 4 for crushing the plastic parts;

[0033] The device can be used in conjunction with a conveying mechanism, which is preferably a conveyor belt for conveying materials. When the plastic products need to be crushed, the staff can start the conveying mechanism, which conveys the plastic products of different shapes to the crushing box 1. When the specified weight is reached, the extrusion mechanism 2 quantitatively discharges the plastic products and extrude the plastic products. The quantitative method reduces the loss of the crushing mechanism 4 during high-intensity crushing. The stress inside the plastic parts is released through extrusion, which helps to crush them more evenly during the crushing process and improve the crushing efficiency. The extruded plastic parts are then conveyed to the crushing mechanism 4 for crushing through the pushing mechanism 3. The uniform feeding method avoids problems such as low crushing efficiency or equipment failure caused by uneven feeding.

[0034] The extrusion mechanism 2 includes: an extrusion plate 21 for receiving and extruding plastic products, a cylinder 22 for driving the pressure plate to extrude plastic products, and a hinged rod 23 hinged to the extrusion plate 21; a guide groove 24 provided on the crushing box 1, and an elastic component 25 is provided between the extrusion plate 21 and the hinged rod 23; the cylinder 22 is fixedly installed on the top of the crushing box 1; the telescopic rod of the cylinder 22 is fixedly connected to the hinged rod 23; the extrusion plate 21 is slidably installed in the guide groove 24.

[0035] The guide groove 24 is composed of an extrusion guide groove 241 and a turnover guide groove 242 ; a wave groove 243 is formed on the side wall of the turnover guide groove 242 .

[0036] When the conveying mechanism conveys the plastic products into the crushing box 1, they will first fall on the extrusion plate 21. It should be added that the extrusion plates 21 are symmetrically arranged in two pieces. When the plastic products accumulated on the extrusion plates 21 reach the amount required for a single crushing operation (i.e., the preset full load), the cylinder 22 device will drive one end of the extrusion plate 21 to move upward along the inner wall of the crushing box 1. At this time, the other end of the extrusion plate 21 is geometrically constrained by the flip guide groove 242, which will force the extrusion plate 21 to rotate around the hinge axis, thereby causing the two extrusion plates 21 to deflect toward each other, so that the plastic products accumulated on their surfaces slide to the bottom of the crushing box 1, creating favorable conditions for the subsequent extrusion plate 21 to further compress the material.

[0037] It should be noted here that the side wall of the flip guide groove 242 is provided with a wave groove 243; while the extrusion plate 21 is deflected, the extrusion plate 21 can perform additional swinging motion along the wave groove 243. This mechanism effectively accelerates the release process of the material on the extrusion plate 21, thereby effectively preventing the material from accumulating on the extrusion plate 21 and avoiding possible material retention and adhesion problems.

[0038] After all the materials on the extrusion plate 21 fall to the bottom of the crushing box 1, the cylinder 1 22 starts and drives the extrusion plate 21 to move down along a predetermined trajectory to the end of the flip guide groove 242, and then the extrusion plate 21 smoothly transitions to the inside of the extrusion guide groove 241 through the guide mechanism. Since the extrusion guide groove 241 and the hinge rod 23 are in a horizontal alignment state, at this time, the built-in elastic reset component 114 starts to work, prompting the extrusion plate 21 to perform a reset action until the hinge rod 23 and the extrusion plate 21 form a vertical posture, ensuring that the extrusion process is stable and reliable.

[0039] Then, the squeezing plate 21 applies uniform pressure to the plastic products at the bottom of the crushing box 1 in a stable vertical posture, so that they are tightly combined to form blocks. Then, the subsequent pushing mechanism 3 accurately conveys these block plastic products to the crushing mechanism 4. The crushing mechanism 4 is then started to perform efficient crushing operations on the block materials, which not only greatly improves the crushing efficiency, but also effectively avoids the risk of blockage at the front end of the crushing mechanism 4 caused by excessive dispersion of the materials.

[0040] What needs to be expanded here is that an angle sensor is installed at the hinge part of the extrusion plate 21 and the hinge rod 23. As the plastic products on the extrusion plate 21 continue to accumulate, the extrusion plate 21 is gradually pressed down due to the gravity of the plastic products, and a small rotation angle change occurs around the hinge point of the hinge rod 23. The angle change is monitored and recorded in real time by the angle sensor. When the rotation angle reaches a preset threshold, the angle sensor triggers an abnormal signal feedback mechanism. This signal indicates that the weight of the material to be crushed on the current extrusion plate 21 has reached an optimized value. This value is based on the consideration of maximizing the efficiency and optimizing the crushing effect of the crushing mechanism 4 during the feeding and crushing process, and is pre-set by humans based on rich experience; the setting of this threshold is intended to ensure that the feeding amount each time can not only ensure the crushing efficiency, but also obtain the best crushing quality; at this time, the cylinder 22 moves upward, causing the material on the extrusion plate 21 to fall to the bottom of the crushing box 1.

[0041] It should be summarized here that the plastic products transported to the crushing box 1 by the conveying mechanism first fall on the metering extrusion plate 21. When its weight reaches the preset value, the cylinder drives the extrusion plate 21 to move upward along the guide groove 24, thereby realizing the overturning and unloading under the constraint of the guide groove 24; at the same time, under the guidance of the wave groove 243, the extrusion plate 21 swings back and forth during the overturning and unloading process to accelerate the material to fall off the extrusion plate 21; in addition, after the material on the extrusion plate 21 completely falls into the bottom of the crushing box 1, the cylinder pushes the extrusion plate 21 to move downward. During this process, the extrusion plate 21 remains parallel to the bottom surface of the crushing box 1 under the action of the extrusion guide groove 241, and relies on its downward movement to compress and mold the plastic products in the crushing box 1, so as to facilitate subsequent crushing and feeding operations; it is worth mentioning that when the material is pressed down, the staff does not need to suspend the feeding mechanism, and the upper end of the extrusion plate 21 can continue to receive the material, thereby effectively reducing the unnecessary loss caused by the shutdown of the pushing mechanism 3 when pushing the material.

[0042] In the process of processing and recycling plastic products, we often have to face the problem of diverse shapes and complex structures of plastic products; especially those plastic products with cavity structures. Due to the existence of cavities inside, it is difficult to achieve the ideal compression effect during the flattening or crushing process, which not only affects the subsequent processing efficiency of plastic products, but may also lead to serious problems of material port blockage during the crushing process.

[0043] The elastic component 25 includes: an arc-shaped sleeve rod 251 fixedly mounted on the hinge rod 23, an arc-shaped pull rod 252 slidably mounted in the arc-shaped sleeve rod 251, and a spring 253 for driving the arc-shaped pull rod 252 to return to its original position.

[0044] During the flipping process of the extrusion plate 21, the extrusion plate 21 will pull the arc-shaped pull rod 252 to slide in the arc-shaped sleeve rod 251. When the extrusion plate 21 is pushed back into the extrusion guide groove 241 along with the cylinder 1 22, the spring 2 253 drives the extrusion plate 21 to reset. It should be noted here that the limitation of the arc-shaped sleeve rod 251 ensures that the extrusion plate 21 will not flip upward when moving downward to extrude the plastic product, thereby making the pressure applied by the extrusion plate 21 on the plastic product more stable.

[0045] A piercing mechanism 11 is also provided at the bottom of the crushing box 1; the piercing mechanism 11 includes: a nail plate 111 fixedly installed at the bottom of the crushing box 1, a pressure plate 112 slidably installed on the nail plate 111, a reset spring 113 for driving the pressure plate 112 to reset, and a reset component 114 for preventing the pressure plate 112 from getting stuck; the pressure plate 112 is provided with a nail hole 115 for the nails on the nail plate 111 to pass through.

[0046] With the drive of the cylinder 22, the extrusion plate 21 moves downward, thereby exerting pressure on the plastic product; while the plastic product is being squeezed, it simultaneously pushes the pressure plate 112 to move downward; at this time, the nails on the nail plate 111 penetrate the reserved nail holes 115 on the pressure plate 112 and pierce into the interior of the plastic product, especially for those plastic products containing cavity structures. This step prevents the problem of poor flattening effect caused by the presence of cavity structures in the plastic product, thereby avoiding the blockage of the material port that may occur in the subsequent crushing process.

[0047] It should be noted here that the nail plate 111 is used to puncture and deflate the plastic product. After long-term use, the spring that drives the pressure plate 112 to return to its original position may lose its elasticity and the nail plate 111 may get stuck in the plastic and be unable to return to its original position, causing the push plate 31 to damage the nail plate 111 when pushing the plastic.

[0048] The reset assembly 114 includes: a piston ring 1141 sleeved on the arc pull rod 252, a cavity 1142 opened in the arc sleeve rod 251, a cavity 1143 opened at the bottom of the nail plate 111, a cavity 1144, a piston 1145 slidably installed in the cavity 1143 and the cavity 1144, a piston 1146, and a lifting rod 1147 slidably installed in the cavity 1144; the piston 1145 is fixedly connected to the piston 2 1146; the cavity 1142 is connected to the cavity 2 1143 through a hose 1148.

[0049] When the extrusion plate 21 flips, the arc-shaped pull rod 252 slides inside the arc-shaped sleeve rod 251, causing the cavity 1142 inside the arc-shaped sleeve rod 251 to produce a negative pressure effect. The negative pressure state in cavity 1142 is transmitted to cavity 2 1143 through the medium of hose 1148, thereby prompting piston 1145 inside cavity 2 1143 to move closer to cavity 1 1142. At the same time, piston 2 1146 slides synchronously inside cavity 3 1144, and this action increases the pressure inside cavity 3 1144, forming a pressurized state. Under this pressurized effect, the lifting rod 1147 slidably installed inside cavity 3 1144 produces an upward displacement movement, thereby lifting the pressure plate 112, effectively preventing the pressure plate 112 from getting stuck and other problems, and significantly improving the operating stability and reliability of the device.

[0050] Therefore, each time the extrusion plate 21 turns over to discharge the material, the pressure plate 112 can also be lifted to prevent the pressure plate 112 from getting stuck.

[0051] The pushing mechanism 3 includes: a pushing plate 31 for pushing the plastic product, a second cylinder 32 for driving the pushing plate 31 to move, and a knocking component for knocking the extrusion plate 21 synchronously with the movement of the second cylinder 32;

[0052] After the extruder extrude the plastic, the cylinder 1 22 drives the extrusion plate 21 to reset, and at this time, the spring 1 drives the pressure plate 112 to reset; the cylinder 2 32 then drives the push plate 31 to move, and when the push plate 31 moves, it pushes the plastic pressed into blocks on the pressure plate 112 into the crushing mechanism 4 for crushing; pushing the material into the crushing mechanism 4 by pushing can effectively provide a stable thrust, ensuring that the material will not be damaged or deformed due to shaking or bumping during the pushing process, thereby ensuring the quality of the material, and at the same time, the pushing position and strength of the material can be accurately controlled, so that the material can accurately enter the crushing mechanism 4, avoiding problems such as poor crushing effect or equipment damage caused by improper pushing.

[0053] The knocking assembly includes: a wave guide groove 331 opened on the side wall of the crushing box 1, a knocking plate 332 slidably installed in the push plate 31, and a rubber block 333 fixedly installed on the knocking plate 332; the knocking plate 332 is slidably installed in the wave guide groove 331.

[0054] When the cylinder 2 32 drives the push plate 31 to perform the feeding action, the knocking plate 332 and the rubber block 333 fixed thereon reciprocate up and down along the fluctuation amplitude of the wave guide groove 331 on the side wall of the crushing box 1. During this process, the rubber block 333 continuously knocks the lower end of the extrusion plate 21, thereby ensuring that the plastic products falling on the extrusion plate 21 are arranged flatly under the action of continuous vibration, thereby avoiding the phenomenon of disorderly accumulation of plastic products on the extrusion plate 21.

[0055] The crushing mechanism 4 includes: a crushing roller 41, a motor 42 for driving the crushing roller to rotate, and a screening screen 43 for screening the crushed plastic fragments; the crushing roller 41 is rotatably mounted on the crushing box 1; the screening screen 43 is detachably connected to the crushing box 1;

[0056] The push plate 31 pushes the block plastic to the crushing roller 41, and the motor 42 drives the crushing roller 41 to rotate to crush the plastic, and the crushed plastic is screened by the screening net 43 to obtain plastic fragments that meet the requirements.

[0057] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0058] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A plastic product crushing device, characterized in that: include: A crushing box, an extrusion mechanism for squeezing plastic products before crushing, a pushing mechanism for pushing the extruded plastic parts for crushing, and a crushing mechanism for crushing the plastic parts; The extrusion mechanism includes: an extrusion plate for receiving and extruding the plastic product, a cylinder 1 for driving the pressure plate to extrude the plastic product, and a hinged rod hinged to the extrusion plate; a guide groove provided on the crushing box, and an elastic component provided between the extrusion plate and the hinged rod; the cylinder 1 is fixedly installed on the top of the crushing box; the telescopic rod of the cylinder 1 is fixedly connected to the hinged rod; and the extrusion plate is slidably installed in the guide groove.

2. A plastic product crushing device as claimed in claim 1, characterized in that: The guide groove is composed of an extrusion guide groove and a turnover guide groove; a wave groove is formed on the side wall of the turnover guide groove.

3. A plastic product crushing device as claimed in claim 1, characterized in that: The elastic component comprises: an arc-shaped sleeve rod fixedly installed on the hinge rod, an arc-shaped pull rod slidably installed in the arc-shaped sleeve rod, and a second spring for driving the arc-shaped pull rod to return to its original position.

4. A plastic product crushing device as claimed in claim 1, characterized in that: The bottom of the crushing box is also provided with a puncturing mechanism; The piercing mechanism includes: a nail plate fixedly installed at the bottom of the crushing box, a pressure plate slidably installed on the nail plate, a reset spring that drives the pressure plate to reset, and a reset component that prevents the pressure plate from getting stuck; the pressure plate is provided with nail holes for the nails on the nail plate to pass through.

5. A plastic product crushing device as claimed in claim 4, characterized in that The reset assembly includes: a piston ring sleeved on the arc-shaped pull rod, a cavity 1 opened in the arc-shaped sleeve rod, a cavity 2 opened at the bottom of the nail plate, a cavity 3, a piston 1 slidably installed in the cavity 2 and cavity 3, a piston 2, and a lifting rod slidably installed in the cavity 3; the piston 1 is fixedly connected to the piston 2; the cavity 1 is connected to the cavity 2 through a hose.

6. A plastic product crushing device as claimed in claim 1, characterized in that: The pushing mechanism comprises: a pushing plate for pushing the plastic product, a second air cylinder for driving the pushing plate to move, and a knocking component for knocking the extrusion plate synchronously with the movement of the second air cylinder.

7. A plastic product crushing device as claimed in claim 6, characterized in that: The knocking assembly comprises: a wave guide groove opened on the side wall of the crushing box, a knocking plate slidably installed in the push plate, and a rubber block fixedly installed on the knocking plate; the knocking plate is slidably installed in the wave guide groove.

8. A plastic product crushing device as claimed in claim 1, characterized in that: The crushing mechanism comprises: a crushing roller, a motor driving the crushing roller to rotate, and a screening screen for screening the crushed plastic fragments; the crushing roller is rotatably mounted on the crushing box; and the screening screen is detachably connected to the crushing box.

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