Crushing device and method for recycling and reusing waste plastics

Abstract

The invention discloses a crushing device and method for waste plastic recycling and reusing, and relates to the technical field of plastic recycling, the crushing device comprises a machine body placed on the ground, the machine body is internally provided with a crushing cavity, a feeding port and a discharging port, the feeding port and the discharging port are both communicated with the crushing cavity, and a feeding end is arranged at the feeding port and used for feeding; a crushing wheel is arranged in the crushing cavity, and the crushing wheel rotates to crush the plastic; one end of the flow guide groove extends to the bottom of the crushing wheel, the other end of the flow guide groove extends towards the middle of the crushing wheel, and air enters the flow guide groove from the bottom of the crushing wheel and pushes the plastic foam to be attached to the surface of the crushing wheel when flowing out of the flow guide groove; and the conveying assembly is located at the discharging opening and extends into the crushing cavity, and in the crushing process through crushing, downward pressure is provided for crushed plastic foam jumping in the crushing cavity by increasing flowing of air in the crushing cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic recycling, and particularly to a crushing device and method for recycling waste plastics. Background Art

[0002] Crushing is a key link in the process of recycling waste plastics. Using crushers (such as blade crushers, hammer crushers or grinding disc crushers), the processed plastics can be cut into small pieces or granules. During the crushing process, the tool design, rotational speed and temperature control of the equipment are very crucial. It is necessary to avoid plastic thermal degradation caused by excessive temperature generated by friction while ensuring the crushing efficiency and product uniformity.

[0003] Publication No. CN106346644B discloses a waste plastic crushing device, particularly a highly reliable waste plastic crushing device. The technical problem to be solved by the present invention is to provide a highly reliable waste plastic crushing device with complete crushing. To solve the above technical problem, the present invention provides such a highly reliable waste plastic crushing device, including a crushing box, a grinding device, a crushing plate, a guide plate, a second contact roller, a second fixing block, a second elastic member, a moving rod, crushing teeth, a lifting rod, etc.; a grinding device is arranged at the bottom inside the crushing box. By starting the first motor to intermittently reverse and forward rotate, driving the moving rod to intermittently move right and left, driving the lifting rod to intermittently move down and up, the waste plastics falling into the crushing box are completely crushed, achieving the effect of complete crushing.

[0004] Plastic foam usually has a light weight, closed-cell or semi-closed-cell structure and good elasticity. When pressure is applied by the crushing wheel, the foam will not only undergo local compression, but also produce elastic rebound due to the restorative reaction of internal bubbles. This rebound causes some materials to bounce in the crushing cavity, thus failing to fully contact the crushing wheel or other shearing elements. Moreover, when the foam feeding is discontinuous or unevenly distributed, local overload or no-load phenomena will occur in local areas. Local overload easily causes the foam to be subjected to excessive shear force, while the no-load area may cause the foam to be in a "floating" state and be prone to "jumping" along with the crushing wheel.

[0005] The phenomena of rebound, floating and jumping during the crushing process result in the crushing energy not being fully or unable to be transmitted to the material, reducing the overall crushing efficiency. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a crushing device and method for recycling waste plastics, which are used to improve the jumping phenomenon of the plastic's own material properties inside the crushing cavity during the plastic crushing process, reduce the error between the actual crushing efficiency and the theoretical crushing efficiency, and improve the plastic crushing efficiency.

[0007] To achieve the above object, the present invention is realized by the following technical solutions: A crushing device for waste plastic recycling and reuse, including a machine body placed on the ground. Inside the machine body, there is a crushing chamber, a feed inlet, and a discharge outlet. Both the feed inlet and the discharge outlet are connected to the crushing chamber, and a feed end is provided at the feed inlet for feeding. A crushing wheel is provided inside the crushing chamber, and the rotation of the crushing wheel realizes the crushing of plastics. The crushing device further includes: A diversion groove arranged along the crushing wheel. One end of the diversion groove extends to the bottom of the crushing wheel, and the other end extends towards the middle of the crushing wheel. Air enters the inside of the diversion groove from the bottom of the crushing wheel, and when flowing out through the diversion groove, it pushes the plastic foam to fit the surface of the crushing wheel. A conveying component, located at the discharge outlet and extending into the crushing chamber. The conveying component determines the crushing efficiency based on the weighing of the plastic foam. Among them, the crushing wheel is composed of multiple crushing cutter heads. The crushing cutter heads are arranged in a stepped shape from large to small in sequence. The adjacent crushing wheels are arranged upside down left and right and rotate in opposite directions. A crushing gap is formed between the crushing wheels, and the plastic foam enters the bottom of the machine body from the crushing gap.

[0008] In one or more embodiments of the present invention, a driving device is arranged outside the crushing wheel to drive the crushing wheel to rotate. The rotation directions between adjacent crushing wheels are opposite. Support members are arranged at both ends of the crushing wheel to support the crushing wheel. The support members are installed on the inner side of the machine body, and the driving device is fixed outside the machine body.

[0009] In one or more embodiments of the present invention, the support member includes a fixed bracket installed inside the machine body and an adjustable buckle plate. Both ends of the crushing wheel extend to the inside of the buckle plate. The fixed bracket is provided with a guide groove, and the crushing wheel slides along the guide groove to change its position.

[0010] In one or more embodiments of the present invention, an air supply unit is configured inside the machine body. The air supply unit is connected to the diversion groove and supplies air to the inside of the diversion groove. The air flow section of the diversion groove extends into the crushing gap. Among them, a mesh cover is arranged inside the machine body. The mesh cover is located at the air inlet of the air supply unit. The air forms a cycle inside the machine body, and the crushed plastics move inside the machine body following the air.

[0011] In one or more embodiments of the present invention, support bodies are arranged on both sides of the mesh cover. The support bodies are used to limit the shape of the mesh cover. The support bodies are elastically arranged. The mesh cover is configured with two types of mesh holes. The side close to the air supply unit has large mesh holes, and the side close to the crushing wheel has small mesh holes.

[0012] In one or more embodiments of the present invention, the conveying component includes: A conveyor belt extending into the interior of the crushing chamber, the conveyor belt being driven by conveyor rollers and a driving device, the conveyor belt being concave, and a scraper being arranged at one end of the conveyor belt extending outside the machine body, the scraper fitting the surface of the conveyor belt and being inclined; A pressure monitoring unit is arranged at the bottom of the conveyor belt to obtain the change of pressure data when the conveyor belt conveys plastic foam, and the actual crushing efficiency is determined based on the change of pressure data.

[0013] In one or more embodiments of the present invention, the air supply unit includes: A fan installed inside the machine body, the air inlet side of the fan facing the wire mesh cover and the air outlet side facing the diversion groove; A guiding pipe connecting the fan and the diversion groove, an electric control valve for adjusting the air volume being arranged in the middle of the guiding pipe, and the electric control valve adjusting the air volume distribution of the guiding pipe corresponding to the diversion groove.

[0014] In one or more embodiments of the present invention, an adjustable diversion plate is arranged at one end of the diversion groove extending to the upper part of the crushing wheel, the diversion plate being located inside the machine body and restricting the angle of air flowing out of the diversion groove, and an adjusting member being arranged on the back of the diversion plate for finely adjusting the angle of the diversion plate.

[0015] In one or more embodiments of the present invention, the crushing gaps between the diversion groove and the crushing wheel are all arranged in a staggered manner.

[0016] The present application also provides a crushing method for waste plastic recycling and reuse, which is used for the above-mentioned crushing device and includes the following steps: Convey the pre-treated plastic foam to the interior of the crushing chamber through the feeding end; The crushing wheel rotates to drive the crushing cutter head to rotate at a high speed, the crushing cutter head rotates at a high speed to cut the plastic foam, and at the same time, the stepped crushing wheel is used to increase the shearing force on the plastic foam; Air enters the diversion groove from the bottom of the crushing chamber and flows out from the other end of the diversion groove to form a directional air flow, which pushes the foam to be evenly distributed at the crushing gap, and the crushing wheel continuously rotates to crush the plastic foam; The crushed plastic foam falls into the bottom of the crushing chamber through the crushing gap, the conveying assembly weighs the plastic foam to determine the crushing efficiency, and conveys the crushed plastic foam to the next link.

[0017] Through the above technical solutions, the present invention has the following beneficial effects: 1. During the crushing process of the present application, by increasing the air flow inside the crushing chamber, a downward pressure is provided to the plastic foam that bounces inside the crushing chamber after being crushed, so that the plastic foam can stably enter the inner side of the crushing gap, and the plastic foam is crushed by the rotation of the crushing wheel.

[0018] 2. This application adjusts the direction of the airflow ejected from the guide groove and the covering position by setting a guide groove that can adjust the direction of the air flow and cooperating with the guide plate, so that after the crushing gap is adjusted, the position of the guide plate can be adjusted accordingly to determine the reasonable downforce and crushing state, and further reduce the error between the actual crushing efficiency and the theoretical crushing efficiency.

[0019] 3. Due to the electrostatic characteristics of the plastic foam itself, an air flow path is formed inside the machine body through the cooperation of the air supply unit and the guide groove. The air flow drives the plastic foam to move inside the machine body, reducing the adhesion of the plastic foam inside the machine body and further improving the fluidity of the plastic foam inside the machine body.

[0020] 4. A flexible mesh cover is set up and supported by a support body to ensure the stability of the mesh cover's swinging state. The elastic setting of the support body is used in conjunction with the air supply unit to make the mesh cover vibrate regularly, so that the plastic foam container attached to the surface of the mesh cover is separated from the mesh cover and falls onto the conveyor belt and is transported to the outside of the machine body.

[0021] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of the present invention; Figure 2 A schematic diagram of a removal conveying assembly of the present invention; Figure 3 It is a cross-sectional view of the body of the present invention; Figure 4 Schematic diagram of the internal structure of the body of the present invention; Figure 5 This is a schematic diagram of the crushing wheel structure of the present invention; Figure 6 This is a schematic diagram of the partial structure of the crushing wheel of the present invention; Figure 7 is a schematic diagram of a support member of the present invention; Figure 8 An exploded view of the support member of the present invention; Figure 9 It is a side sectional view of the body of the present invention; Figure 10 This is a schematic structural diagram of the guide plate and the adjusting member of the present invention; Figure 11 It is a schematic diagram of the mesh cover structure of the present invention; Figure 12 Schematic diagram of the air supply unit of the present invention; Figure 13 Schematic diagram of the conveying component of the present invention; Figure 14 Schematic diagram of the installation of the pressure monitoring unit of the present invention.

[0023] In the figure: 1 body, 2 crushing chamber, 3 feeding port, 4 discharging port, 5 crushing wheel, 6 conveying component, 8 support; 21 diversion groove, 22 crushing cutter head, 23 crushing gap, 24 screen cover, 25 support body; 221 air supply unit, 222 magnet, 223 fan, 224 guide pipe, 225 electric control valve, 226 diversion plate, 227 adjusting part; 61 conveyor belt, 62 driving device, 63 scraper, 64 pressure monitoring unit; 81 fixing bracket, 82 buckle plate, 83 guide groove, 84 spring, 85 limit block, 86 sliding groove. Detailed implementation manners

[0024] The following will disclose multiple implementation manners of the present invention with the accompanying drawings. For the sake of clear description, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present invention. That is to say, in some implementation manners of the present invention, these practical details are not necessary. And if possible in implementation, the features of different embodiments can be used interchangeably.

[0025] Unless otherwise defined, all the terms (including technical and scientific terms) used herein have their usual meanings, and their meanings can be understood by those skilled in this field. Further, the definitions of the above terms in the commonly used dictionary should be interpreted as having the same meaning as the relevant fields of the present invention in the content of this specification. Unless specifically defined, these terms will not be interpreted as idealized or overly formal meanings.

[0026] The following explains the relationships and terms used in this application: Parallel: The parallel defined in this application is not limited to absolute parallel. This definition of parallel can be understood as substantially parallel, allowing for non-absolute parallel situations caused by factors such as assembly tolerances, design tolerances, and the influence of structural flatness, and allowing for errors within a small angular range. For example, within an assembly error range of less than 10 degrees, it can be understood as a parallel relationship.

[0027] Vertical: The vertical defined in this application is not limited to an absolutely vertically intersecting (with an included angle of 90 degrees) relationship. A relationship that is not an absolutely vertically intersecting one due to factors such as assembly tolerances, design tolerances, and the influence of structural flatness is allowed, and a small-angle range of errors is permitted. For example, within an assembly error range of 80 degrees to 100 degrees, it can all be understood as a vertical relationship.

[0028] Ground: The ground defined in this application is not limited to a ground of a certain material or region. It is only a platform on the surface for carrying this application, and stacking, tilting, and flatness changes are allowed. For example, a cement ground, a ceramic tile ground, a working platform, etc. can all be interpreted as the ground.

[0029] The above explanations do not fully cover the relationship definitions given in this application, but only represent a part of this application.

[0030] Refer to Figures 1-5 As shown, the present invention provides a crushing device for waste plastic recycling and reuse, which is used for crushing plastic foam. During the crushing process, the problem of reduced crushing efficiency caused by the plastic foam bouncing inside the crushing cavity 2 is reduced, and the crushing efficiency is improved.

[0031] The crushing device includes a machine body 1 placed on the ground. Inside the machine body 1, there are a crushing cavity 2, a feed inlet 3, and a discharge outlet 4. Both the feed inlet 3 and the discharge outlet 4 are communicated with the crushing cavity 2, and a feed end is provided at the feed inlet 3 for feeding. Inside the crushing cavity 2, there is a crushing wheel 5, and the rotation of the crushing wheel 5 realizes the crushing of the plastic. The crushing device further includes: A diversion groove 21 arranged along the crushing wheel 5. One end of the diversion groove 21 extends to the bottom of the crushing wheel 5, and the other end extends towards the middle of the crushing wheel 5. Air enters the inside of the diversion groove 21 from the bottom of the crushing wheel 5, and when flowing out through the diversion groove 21, it pushes the plastic foam to fit the surface of the crushing wheel 5. A conveying assembly 6, which is located at the discharge outlet 4 and extends into the crushing cavity 2. The conveying assembly 6 determines the crushing efficiency based on the weighing of the plastic foam. Among them, the crushing wheel 5 is composed of a plurality of crushing knife heads 22. The crushing knife heads 22 are arranged in a stepped shape from large to small in sequence to form the crushing wheel 5. The adjacent crushing wheels 5 are arranged upside down left and right and rotate in opposite directions. A crushing gap 23 is formed between the crushing wheels 5, and the plastic foam enters the bottom of the machine body 1 from the crushing gap 23.

[0032] In an implementable manner, due to the light texture of the plastic foam, it is susceptible to the influence of air flow during the crushing process. By controlling the air flow, the plastic foam can be effectively controlled to fit more closely to the surface of the crushing wheel 5, reduce bouncing, and thus improve the crushing efficiency. This makes the actual crushing efficiency of the crushing device closer to the theoretical crushing efficiency, ensuring the stable crushing of the plastic foam in the crushing chamber 2.

[0033] Among them, the stepped design of the crushing cutter head 22 not only increases the crushing area but also optimizes the force distribution of the material, further enhancing the crushing effect. The side of the crushing cutter head 22 is parallel to the central axis of the crushing wheel 5, and the crushing gap 23 formed by the crushing cutter heads 22 is stepped. When the crushing wheel 5 squeezes the plastic foam, it will also increase the shearing force on the plastic foam, making it easier to break into fine particles.

[0034] The crushing chamber 2 inside the machine body 1 includes two parts. The first part is located above the crushing wheel 5, and the second part is located below the crushing wheel 5. The two parts are connected by a diversion groove 21 and a crushing gap 23. The crushed plastic foam enters the second part of the crushing chamber 2 and is pushed to the discharge port 4 by the conveying component 6.

[0035] Refer to Figures 1-2 As shown, in an embodiment, a driving device is arranged outside the crushing wheel 5 to drive the crushing wheel 5 to rotate. The rotation directions of adjacent crushing wheels 5 are opposite. Support members 8 are arranged at both ends of the crushing wheel 5 to support the crushing wheel 5. The support members 8 are installed inside the machine body 1, and the driving device is fixed outside the machine body 1.

[0036] In an implementable manner, the setting of the support member 8 plays a role in supporting the crushing wheel 5 to ensure that the crushing wheel 5 is stable and does not shake during high-speed operation. At the same time, the design of the support member 8 also facilitates the maintenance and replacement of the crushing wheel 5. When replacing the crushing wheel 5, the crushing wheel 5 can be directly removed by removing the support member 8, simplifying the maintenance process.

[0037] Refer to Figures 6-8 As shown, in an embodiment, the support member 8 includes a fixed bracket 81 installed inside the machine body 1 and an adjustable buckle plate 82. Both ends of the crushing wheel 5 extend to the inside of the buckle plate 82. The fixed bracket 81 is provided with a guide groove 83, and the crushing wheel 5 slides along the guide groove 83 to change the position of the crushing wheel 5.

[0038] In an implementable manner, the position of the crushing wheel 5 is finely adjusted through the guide groove 83 to ensure the accuracy of the crushing gap 23, thereby optimizing the crushing effect. The buckle plate 82 can be flexibly adjusted according to the wear condition of the crushing wheel 5, extending the service life of the equipment.

[0039] Optionally, the guide groove 83 is vertically arranged to change the vertical height of the crushing wheel 5. Since the number of crushing wheels 5 is at least two, adjusting the height of a single crushing wheel 5 can adjust the size of the crushing gap 23, and adjusting two crushing wheels 5 simultaneously can change the sizes of the first and second parts of the crushing chamber 2.

[0040] Alternatively, the guide groove 83 is arranged in an inclined shape, and the axes of the crushing wheels 5 are in the same plane parallel to the ground. Adjusting the height of the crushing wheels 5 simultaneously can change the crushing gap 23 between the crushing wheels 5.

[0041] Wherein, the moving direction of the buckle plate 82 is the same as the extending direction of the guide groove 83. The fixed bracket 81 is provided with a sliding groove 86 along the outside of the guide groove 83, and the buckle plate 82 is buckled in the sliding groove 86 and slides. The inner side of the buckle plate 82 is supported by a spring 84 with a limiting block 85. The limiting block 85 cooperates with the sliding groove 86 to fix the buckle plate 82, and the buckle plate 82 is provided with a bolt to limit the distance between the buckle plate 82 and the sliding groove 86.

[0042] Refer to Figures 9-12 As shown, in one embodiment, an air supply unit 221 is configured inside the machine body 1. The air supply unit 221 is connected to the diversion groove 21 and supplies air to the inside of the diversion groove 21. The air flow section of the diversion groove 21 extends into the crushing gap 23; Wherein, a mesh cover 24 is arranged inside the machine body 1. The mesh cover 24 is located at the air inlet of the air supply unit 221, and air forms a cycle inside the machine body 1. The plastic after being crushed moves inside the machine body 1 along with the air.

[0043] In an implementable manner, the air supply unit 221 is arranged to supply air to the diversion groove 21. That is, during use, the air supply unit 221 transports air from the diversion groove 21 to the first part of the crushing chamber 2, so that a high-speed air flow is formed in the crushing gap 23, effectively driving the plastic foam to fall into the crushing gap 23, improving the crushing efficiency. The air supply unit 221 can adjust the wind speed according to the crushing requirements.

[0044] Wherein, due to the problem of electrostatic adsorption of plastic foam, therefore, the air flow can effectively reduce the electrostatic adsorption of plastic foam, ensuring that the plastic foam smoothly enters the crushing gap 23 and flows in the second part of the crushing chamber 2.

[0045] Refer to Figures 11-12 As shown, in one embodiment, support bodies 25 are arranged on both sides of the mesh cover 24. The support bodies 25 are used to limit the shape of the mesh cover 24. The support bodies 25 are elastically arranged. The mesh cover 24 is configured with two types of mesh holes. The side close to the air supply unit 221 has large mesh holes, and the side close to the crushing wheel 5 has small mesh holes.

[0046] In one implementable manner, the mesh cover 24 is set to two mesh partitions. The large-mesh area facilitates air circulation, enabling air to be inhaled by the air supply unit 221 from the large meshes. The small-mesh area, in cooperation with the plastic foam, promotes the flow of air in the area between the mesh covers 24 to guide the plastic foam.

[0047] Among them, the support 25 can limit the mesh cover 24 in a specific state, and the elasticity of the support 25 ensures that the mesh cover 24 can swing within a certain range to adapt to the changes in air flow during different crushing requirements, ensuring that the mesh cover 24 is always in the best working state and improving the crushing effect.

[0048] In another embodiment, based on the elastic characteristics of the support 25, during the operation of the air supply unit 221, the swing amplitude of the mesh cover 24 is increased through air flow. A magnet 222 is provided on one side of the upper part of the support 25, and a part thereof cooperating with the magnet 222 is magnetically set. During the operation of the air supply unit 221, the mesh cover 24 is gradually pulled to move towards the air supply unit 221. When it moves to a certain position, the magnet 222 repels the magnetic part and cooperates with the jitter of the mesh cover 24 to cause the mesh cover 24 to vibrate greatly to break up the foam and reduce the adhesion of the foam.

[0049] Refer to Figures 13-14 As shown, in one embodiment, the conveying assembly 6 includes: A conveyor belt 61 extending into the crushing chamber 2. The conveyor belt 61 is driven by a conveyor roller and a driving device 62. The conveyor belt 61 is concave, and a scraper 63 is arranged at one end of the conveyor belt 61 extending outside the machine body 1. The scraper 63 fits the surface of the conveyor belt 61 and is inclined; A pressure monitoring unit 64 is arranged at the bottom of the conveyor belt 61 to obtain the change in pressure data when the conveyor belt 61 conveys plastic foam, and determine the actual crushing efficiency based on the change in pressure data.

[0050] In one implementable manner, the concave design of the conveyor belt 61 effectively prevents foam overflow, and the inclined angle of the scraper 63 optimizes the foam guidance to ensure efficient conveying. At the scraper 63, subsequent processing such as packaging the crushed foam can be carried out.

[0051] Among them, the pressure monitoring unit 64 feeds back data in real time. When the feeding speed is constant, by analyzing the pressure change, the crushing efficiency can be determined. An increase in pressure indicates an improvement in the crushing effect, and a decrease in pressure indicates that the crushing effect does not meet the expected effect. Based on this data, the crushing parameters and the wind speed of the air supply unit 221 are adjusted to ensure a stable and efficient crushing process.

[0052] Refer to Figures 11-12 As shown, in one embodiment, the air supply unit 221 includes: The fan 223 is installed inside the machine body 1. The air inlet side of the fan 223 faces the wire mesh cover 24, and the air outlet side faces the diversion trough 21. The guide pipe 224 connects the fan 223 and the diversion trough 21. An electric control valve 225 for adjusting the air volume is arranged in the middle of the guide pipe 224. The electric control valve 225 adjusts the air volume distribution of the guide pipe 224 corresponding to the diversion trough 21.

[0053] In an implementable manner, the air volume generated by the fan 223 at a certain power is fixed. By adjusting the air volume distribution of the guide pipe 224 through the electric control valve 225, the wind speed in each area of the diversion trough 21 can be accurately controlled to ensure uniform air volume distribution. And the adjustment of the air volume of each diversion trough 21 can be reasonably set according to the foam density in different areas.

[0054] Among them, since the ventilation volume of the crushing gap 23 is fixed, when the air volume in the diversion trough 21 increases, some foams will be quickly blown away, reducing accumulation and improving the crushing uniformity; on the contrary, when the air volume decreases, the residence time of the foam in the crushing gap 23 is prolonged, and the crushing is finer, ensuring that the overall crushing effect reaches the best.

[0055] Refer to Figure 4 and Figures 9-10 As shown, in an embodiment, one end of the diversion trough 21 extending to the upper part of the crushing wheel 5 is provided with an adjustable deflector 226. The deflector 226 is located inside the machine body 1 and limits the angle of air flowing out of the diversion trough 21. An adjusting member 227 is arranged on the back of the deflector 226 for fine-tuning the angle of the deflector 226.

[0056] In an implementable manner, the fine-tuning of the angle of the deflector 226 can accurately control the air flow direction, optimize the distribution of the foam in the crushing wheel 5, and ensure the uniform utilization of the crushing gap 23. The staggered crushing gaps 23 effectively avoid foam accumulation and improve the crushing efficiency.

[0057] Among them, the change in the angle of the deflector 226 corresponds to the range area of the downward pressing foam, thereby affecting the range of the plastic foam fitting the crushing wheel 5.

[0058] Optionally, the adjusting member 227 on the back of the deflector 226 uses the magnetic force of the electromagnetic block to control the swinging angle of the deflector 226. Among them, the change in the magnetic force of the electromagnetic block corresponds to the change in the size of the crushing gap 23. The position changes of the two crushing wheels 5 are obtained to determine the crushing gap 23 between the crushing wheels 5. And the swinging angle of the deflector 226 is proportional to the magnetic force of the electromagnetic block. The change in the crushing gap 23 corresponds to the fineness of the foam crushing. The coverage range after the adjustment of the deflector 226 is based on the change in the fineness of the foam after crushing.

[0059] In an embodiment, the crushing gaps 23 between the diversion trough 21 and the crushing wheel 5 are all arranged in a staggered manner.

[0060] The misaligned arrangement of the diversion channels can better conform to the crushing wheel to press down the plastic foam.

[0061] In another embodiment, the diversion channels are evenly arranged, and the air flow state is adjusted by changing the inclination angle of the diversion plate.

[0062] This application also provides a crushing method for waste plastic recycling and reuse, which is used for the above-mentioned crushing device and includes the following steps: Convey the pre-treated plastic foam to the inside of the crushing chamber 2 through the feeding end; The crushing wheel 5 rotates to drive the crushing cutter head 22 to rotate at high speed. The crushing cutter head 22 rotates at high speed to cut the plastic foam. At the same time, the stepped crushing wheel 5 is used to increase the shearing force on the plastic foam; Air enters the diversion channel 21 from the bottom of the crushing chamber 2 and flows out from the other end of the diversion channel 21 to form a directional air flow, which pushes the foam to be evenly distributed to the crushing gap 23. The crushing wheel 5 continuously rotates to crush the plastic foam; The crushed plastic foam falls from the crushing gap 23 to the bottom of the crushing chamber 2. The conveying assembly 6 weighs the plastic foam to determine the crushing efficiency and conveys the crushed plastic foam to the next process.

[0063] In summary, the technical solutions disclosed in the above embodiments of the present invention have at least the following advantages: During the crushing process of this application, by increasing the air flow inside the crushing chamber, a downward pressure is provided for the plastic foam that bounces inside the crushing chamber after being crushed, so that the plastic foam can stably enter the inside of the crushing gap, and the plastic foam is crushed by the rotation of the crushing wheel.

[0064] This application cooperates with the diversion channel and the diversion plate that can adjust the air flow direction to complete the adjustment of the air flow direction and the covering position ejected from the diversion channel, so that after the crushing gap is adjusted, the position of the diversion plate can be adjusted accordingly to determine a reasonable downward pressure and crushing state, and further reduce the error between the actual crushing efficiency and the theoretical crushing efficiency.

[0065] Due to the electrostatic characteristics of the plastic foam itself, through the cooperation of the air supply unit and the diversion channel, an air flow path is formed inside the machine body, and the plastic foam is driven to move inside the machine body by the air flow, reducing the adhesion of the plastic foam inside the machine body and further improving the fluidity of the plastic foam inside the machine body.

[0066] A flexible mesh cover is set up and supported by a support body to ensure the stability of the mesh cover's swinging state. The elastic setting of the support body is used in conjunction with the air supply unit to make the mesh cover vibrate regularly, so that the plastic foam container attached to the surface of the mesh cover is separated from the mesh cover and falls onto the conveyor belt and is transported to the outside of the machine body.

[0067] Although the present invention is disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the attached claims.

Claims

1. A crushing device for the recycling and reuse of waste plastics, including a machine body (1) placed on the ground. Inside the machine body (1), there is a crushing chamber (2), a feed inlet (3) and a discharge outlet (4). The feed inlet (3) and the discharge outlet (4) are both communicated with the crushing chamber (2), and a feed end is provided at the feed inlet (3) for feeding. A crushing wheel (5) is arranged inside the crushing chamber (2), and the rotation of the crushing wheel (5) realizes the crushing of plastics. It is characterized in that The crushing device further includes: A diversion groove (21) arranged along the crushing wheel (5). One end of the diversion groove (21) extends to the bottom of the crushing wheel (5), and the other end extends towards the middle of the crushing wheel (5). Air enters the inside of the diversion groove (21) from the bottom of the crushing wheel (5), and when flowing out through the diversion groove (21), it pushes the plastic foam to fit the surface of the crushing wheel (5). A conveying assembly (6) is located at the discharge outlet (4) and extends into the crushing chamber (2). The conveying assembly (6) determines the crushing efficiency based on the weighing of the plastic foam. Among them, the crushing wheel (5) is composed of a plurality of crushing cutter heads (22). The crushing cutter heads (22) are arranged in a stepped shape from large to small to form a stepped crushing wheel (5). The adjacent crushing wheels (5) are arranged upside down left and right and rotate in opposite directions. A crushing gap (23) is formed between the crushing wheels (5), and the plastic foam enters the bottom of the machine body (1) from the crushing gap (23).

2. The crushing device for waste plastic recycling according to claim 1, characterized in that, A driving device is arranged outside the crushing wheel (5) to drive the crushing wheel (5) to rotate. The adjacent crushing wheels (5) rotate in opposite directions. Support members (8) are arranged at both ends of the crushing wheel (5) to support the crushing wheel (5). The support members (8) are installed inside the machine body (1), and the driving device is fixed outside the machine body (1).

3. A crushing device for waste plastic recycling and reuse according to claim 2, characterized in that, The support member (8) includes a fixed bracket (81) installed inside the machine body (1) and an adjustable buckle plate (82). Both ends of the crushing wheel (5) extend to the inside of the buckle plate (82). A guide groove (83) is opened in the fixed bracket (81), and the crushing wheel (5) slides along the guide groove (83) to change the position of the crushing wheel (5).

4. A crushing device for waste plastic recycling and reuse according to claim 3, characterized in that, An air supply unit (221) is configured inside the machine body (1). The air supply unit (221) is communicated with the diversion groove (21) and supplies air to the inside of the diversion groove (21). The air flow section of the diversion groove (21) extends into the crushing gap (23). Among them, a mesh cover (24) is arranged inside the machine body (1). The mesh cover (24) is located at the air inlet of the air supply unit (221). Air forms a cycle inside the machine body (1), and the crushed plastics move inside the machine body (1) along with the air.

5. A crushing device for waste plastic recycling and reuse according to claim 4, characterized in that, Support bodies (25) are arranged on both sides of the mesh cover (24). The support bodies (25) are used to limit the shape of the mesh cover (24). The support bodies (25) are elastically arranged. The mesh cover (24) is configured with two kinds of mesh holes. The side close to the air supply unit (221) has large mesh holes, and the side close to the crushing wheel (5) has small mesh holes.

6. A crushing device for waste plastic recycling and reuse according to claim 5, characterized in that, The conveying assembly (6) includes: A conveyor belt (61) extending into the interior of the crushing chamber (2), the conveyor belt (61) is driven by conveyor rollers and a driving device (62). The conveyor belt (61) is concave, and one end of the conveyor belt (61) extending outside the machine body (1) is equipped with a scraper (63). The scraper (63) fits the surface of the conveyor belt (61) and is inclined. A pressure monitoring unit (64) is arranged at the bottom of the conveyor belt (61) to obtain the change of pressure data when the conveyor belt (61) conveys plastic foam, and determine the actual crushing efficiency based on the change of pressure data.

7. A crushing device for waste plastic recycling and reuse according to claim 6, characterized in that, The air supply unit (221) includes: A fan (223) installed inside the machine body (1). The air inlet side of the fan (223) faces the wire mesh cover (24), and the air outlet side faces the diversion groove (21). A guiding pipe (224) connects the fan (223) and the diversion groove (21). An electric control valve (225) for adjusting the air volume is arranged in the middle of the guiding pipe (224). The electric control valve (225) adjusts the air volume distribution of the guiding pipe (224) corresponding to the diversion groove (21).

8. A crushing device for waste plastic recycling and reuse according to claim 7, characterized in that, One end of the diversion groove (21) extending above the crushing wheel (5) is equipped with an adjustable diversion plate (226). The diversion plate (226) is located inside the machine body (1) and restricts the angle of air flowing out from the diversion groove (21). An adjusting member (227) is arranged on the back of the diversion plate (226) for finely adjusting the angle of the diversion plate (226).

9. A crushing device for waste plastic recycling and reuse according to claim 8, characterized in that, The crushing gap (23) between the diversion groove (21) and the crushing wheel (5) is uniformly arranged in a staggered manner.

10. A method for crushing waste plastics, which is used for a crushing device for recycling waste plastics as described in any one of claims 1-9, characterized in that, It includes the following steps: Convey the pre-treated plastic foam into the interior of the crushing chamber (2) through the feeding end. The crushing wheel (5) rotates to drive the crushing cutter head (22) to rotate at a high speed. The crushing cutter head (22) rotates at a high speed to cut the plastic foam. At the same time, the stepped crushing wheel (5) is used to increase the shearing force on the plastic foam. Air enters the diversion groove (21) from the bottom of the crushing chamber (2) and flows out from the other end of the diversion groove (21) to form a directional air flow, which pushes the foam to be evenly distributed at the crushing gap (23). The crushing wheel (5) continuously rotates to crush the plastic foam. The crushed plastic foam falls into the bottom of the crushing chamber (2) through the crushing gap (23). The conveying assembly (6) weighs the plastic foam to determine the crushing efficiency and conveys the crushed plastic foam to the next process.

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