A crushing device and method for recycling waste plastics

Abstract

This invention discloses a crushing device and method for recycling waste plastics, relating to the field of plastic recycling technology. It includes a machine body placed on the ground, with a crushing chamber, a feed inlet, and a discharge outlet inside. Both the feed inlet and 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, rotating to crush the plastic. A guide channel is provided along the crushing wheel, with one end extending to the bottom of the crushing wheel and the other end extending towards the middle of the crushing wheel. Air enters the guide channel from the bottom of the crushing wheel and, upon flowing out through the guide channel, pushes the plastic foam to adhere to the surface of the crushing wheel. A conveying assembly is located at the discharge outlet and extends into the crushing chamber. In this application, during the crushing process, the airflow inside the crushing chamber is increased to provide downward pressure on the plastic foam that bounces inside the crushing chamber after crushing.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, specifically to a crushing device and method for recycling and reusing waste plastics. Background Technology

[0002] Crushing is a crucial step in the recycling and reuse of waste plastics. Crusheres (such as blade crushers, hammer crushers, or disc crushers) can cut processed plastics into small pieces or granules. During the crushing process, the design of the equipment's blades, rotation speed, and temperature control are critical. It is essential to ensure crushing efficiency and product uniformity while avoiding excessive heat generated by friction that could lead to thermal degradation of the plastic.

[0003] Publication No. CN106346644B discloses a waste plastic crushing device, particularly a highly reliable waste plastic crushing device. The technical problem this invention aims to solve is to provide a highly reliable waste plastic crushing device that achieves complete crushing. To address this problem, this invention provides a highly reliable waste plastic crushing device, comprising a crushing box, a grinding device, a crushing plate, a guide plate, a second contact roller, a second fixed block, a second elastic element, a moving rod, crushing teeth, and a lifting rod; the grinding device is located at the bottom of the crushing box. By intermittently reversing and rotating a first motor, the moving rod is driven to intermittently move to the right and left, and the lifting rod is driven to intermittently move downwards and upwards, thus completely crushing the waste plastic falling into the crushing box, achieving complete crushing.

[0004] Plastic foam typically has a lightweight, closed-cell or semi-closed-cell structure and good elasticity. When pressure is applied by the crushing wheel, the foam not only undergoes localized compression but also elastic rebound due to the recovery reaction of the internal bubbles. This rebound causes some material to bounce within the crushing chamber, thus failing to fully contact the crushing wheel or other shearing elements. Furthermore, when the foam feed is discontinuous or unevenly distributed, localized overload or idling phenomena can occur. Localized overload can easily cause the foam to suffer excessive shear forces, while idling areas may cause the foam to "float," easily "bouncing" with the crushing wheel.

[0005] The rebound, floating, and bouncing phenomena during the crushing process prevent the crushing energy from being fully or completely transferred to the material, thus reducing the overall crushing efficiency. Summary of the Invention

[0006] One of the objectives of this invention is to provide a crushing device and method for recycling waste plastics, which improves the jumping phenomenon that occurs inside the crushing chamber due to the material properties of the plastic itself during the crushing process, reduces the error between the actual crushing efficiency and the theoretical crushing efficiency, and improves the efficiency of plastic crushing.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a crushing device for recycling and reusing waste plastics, comprising a machine body placed on the ground, the machine body having a crushing chamber, a feed inlet and a discharge outlet inside, both the feed inlet and the discharge outlet being connected to the crushing chamber, and a feed end being provided at the feed inlet for feeding.

[0008] The crushing chamber is equipped with crushing wheels, which rotate to crush the plastic.

[0009] The crushing device also includes:

[0010] A guide channel is provided along the crushing wheel. One end of the guide channel extends to the bottom of the crushing wheel, and the other end extends toward the middle of the crushing wheel. Air enters the guide channel from the bottom of the crushing wheel and pushes the plastic foam to adhere to the surface of the crushing wheel when it flows out through the guide channel.

[0011] The conveying assembly, located at the discharge port and extending into the crushing chamber, determines the crushing efficiency based on the weighing of the plastic foam.

[0012] The crushing wheel is composed of multiple crushing cutters arranged in descending order of size to form a stepped crushing wheel. Adjacent crushing wheels are arranged in opposite directions and rotate in opposite directions, forming a crushing gap between them. Plastic foam enters the bottom of the machine body through the crushing gap.

[0013] In one or more embodiments of the present invention, a driving device is provided on the outside of the crushing wheel to drive the crushing wheel to rotate, the adjacent crushing wheels rotate in opposite directions, and support members are provided at both ends of the crushing wheel to support the crushing wheel. The support members are installed inside the machine body, and the driving device is fixed outside the machine body.

[0014] In one or more embodiments of the present invention, the support includes a fixed bracket installed inside the machine body and an adjustable buckle plate. The two ends of the crushing wheel extend to the inner side of the buckle plate. The fixed bracket has guide grooves, and the crushing wheel slides along the guide grooves to change the position of the crushing wheel.

[0015] 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 guide channel and supplies air into the guide channel. The air flow section of the guide channel extends into the crushing gap.

[0016] The machine body is equipped with a mesh cover located at the air inlet of the air supply unit. Air circulates inside the machine body, and the crushed plastic moves with the air inside the machine body.

[0017] In one or more embodiments of the present invention, a support body is provided on both sides of the mesh cover. The support body is used to limit the shape of the mesh cover. The support body is elastically set. The mesh cover is configured with two types of mesh holes: a large mesh hole on the side near the air supply unit and a small mesh hole on the side near the crushing wheel.

[0018] In one or more embodiments of the present invention, the conveying component includes:

[0019] The conveyor belt extends into the crushing chamber and is driven by the drive equipment via conveyor rollers. The conveyor belt is recessed and a scraper is provided at one end of the conveyor belt extending to the outside of the machine body. The scraper is in contact with the surface of the conveyor belt and is inclined.

[0020] The pressure monitoring unit is installed at the bottom of the conveyor belt to acquire pressure data changes when the conveyor belt transports plastic foam, and determines the actual crushing efficiency based on the pressure data changes.

[0021] In one or more embodiments of the present invention, the air supply unit includes:

[0022] The fan is installed inside the unit, with the air inlet side facing the screen and the air outlet side facing the guide channel.

[0023] The guide tube connects the fan and the guide channel. An electrically controlled valve is installed in the middle of the guide tube to adjust the air volume. The electrically controlled valve adjusts the air volume distribution of the guide tube to the corresponding guide channel.

[0024] In one or more embodiments of the present invention, an adjustable guide plate is provided at one end of the guide groove extending to the upper part of the crushing wheel. The guide plate is located inside the machine body and restricts the angle at which air flows out of the guide groove. An adjustment component is provided on the back of the guide plate for fine-tuning the angle of the guide plate.

[0025] In one or more embodiments of the present invention, the crushing gap between the guide channel and the crushing wheel is always staggered.

[0026] This application also provides a crushing method for recycling waste plastics, used in the aforementioned crushing device, comprising the following steps:

[0027] The pre-treated plastic foam is conveyed into the crushing chamber through the feed end;

[0028] The rotation of the crushing wheel drives the crushing head to rotate at high speed, and the crushing head rotates at high speed to cut the plastic foam. At the same time, the stepped crushing wheel increases the shearing force on the plastic foam.

[0029] Air enters the guide channel from the bottom of the crushing chamber and flows out from the other end of the guide channel, forming a directional airflow that pushes the foam to be evenly distributed to the crushing gap. The crushing wheel rotates continuously to crush the plastic foam.

[0030] The crushed plastic foam falls into the bottom of the crushing chamber through the crushing gap. The conveying component weighs the plastic foam to determine the crushing efficiency and then conveys the crushed plastic foam to the next stage.

[0031] Through the above technical solution, the present invention has the following beneficial effects:

[0032] 1. In the crushing process of this application, by increasing the flow of air inside the crushing chamber, downward pressure is applied to the plastic foam that is jumping inside the crushing chamber after crushing, so that the plastic foam can stably enter the inner side of the crushing gap, and the crushing of the plastic foam is achieved by the rotation of the crushing wheel.

[0033] 2. This application uses a guide channel with adjustable airflow direction and a guide plate to adjust the direction and coverage position of the airflow ejected from the guide channel. This allows the position of the guide plate to be adjusted accordingly after the crushing gap is adjusted, thus determining a reasonable downforce and crushing state, and further reducing the error between the actual crushing efficiency and the theoretical crushing efficiency.

[0034] 3. Due to the electrostatic properties of the plastic foam itself, the air supply unit and the guide channel work together to form an airflow path inside the machine body. The airflow 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.

[0035] 4. A flexible mesh cover is installed and supported by a support body to ensure the stability of the mesh cover's swing state. The elastic setting of the support body is used in conjunction with the air supply unit to make the mesh cover vibrate regularly, causing the plastic foam attached to the surface of the mesh cover to detach from the mesh cover and fall onto the conveyor belt to be transported to the outside of the machine body.

[0036] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0037] Figure 1 This is a perspective view of the present invention;

[0038] Figure 2 This is a schematic diagram of the removal and conveying assembly of the present invention;

[0039] Figure 3 This is a cross-sectional view of the body of the present invention;

[0040] Figure 4 This is a schematic diagram of the internal structure of the body of the present invention;

[0041] Figure 5 This is a schematic diagram of the crusher wheel structure of the present invention;

[0042] Figure 6 This is a partial structural diagram of the crusher wheel of the present invention;

[0043] Figure 7 This is a schematic diagram of the support component of the present invention;

[0044] Figure 8 This is an exploded view of the support component of the present invention;

[0045] Figure 9 This is a side sectional view of the body of the present invention;

[0046] Figure 10 This is a schematic diagram of the guide plate and adjusting component of the present invention;

[0047] Figure 11 This is a schematic diagram of the mesh structure of the present invention;

[0048] Figure 12 This is a schematic diagram of the air supply unit of the present invention;

[0049] Figure 13 This is a schematic diagram of the conveying assembly of the present invention;

[0050] Figure 14 This is a schematic diagram of the installation of the pressure monitoring unit of the present invention.

[0051] In the diagram: 1. Machine body; 2. Crushing chamber; 3. Feed inlet; 4. Discharge outlet; 5. Crushing wheel; 6. Conveying assembly; 8. Supporting components.

[0052] 21. Guide channel; 22. Crushing cutter head; 23. Crushing gap; 24. Mesh cover; 25. Support body;

[0053] 221 Air supply unit, 222 Magnet, 223 Fan, 224 Guide pipe, 225 Electrically controlled valve, 226 Flow deflector, 227 Adjusting component;

[0054] 61 Conveyor belt, 62 Drive equipment, 63 Scraper, 64 Pressure monitoring unit;

[0055] 81 Fixed bracket, 82 Buckle plate, 83 Guide groove, 84 Spring, 85 Limiting block, 86 Slide groove. Detailed Implementation

[0056] The following describes several embodiments of the present invention with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. And features of different embodiments may be interchanged if feasible.

[0057] Unless otherwise defined, all terms used herein (including technical and scientific terms) have their ordinary meanings, which are understandable to those skilled in the art. Furthermore, the definitions of the foregoing terms in commonly used dictionaries should be interpreted in the context of this specification as having the meaning consistent with the relevant field of this invention. Unless specifically defined, these terms will not be construed as having idealized or overly formal meanings.

[0058] The following explains the relationships and terms used in this application:

[0059] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism. It allows for situations where the parallelism is not absolute due to factors such as assembly tolerance, design tolerance, and structural flatness. It also allows for errors within a small angular range, such as within 10 degrees of assembly error. These can all be considered as parallel relationships.

[0060] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0061] Ground: The ground as defined in this application is not limited to a specific material or region, but simply refers to a platform on which this application is supported, and allows for stacking, tilting, and variations in flatness. For example, cement floors, tile floors, work platforms, etc., can all be interpreted as ground.

[0062] The above explanation does not fully encompass the relationship definition given in this application, but only represents a part of it.

[0063] See Figure 1-5 As shown, the present invention provides a crushing device for recycling waste plastics, used for crushing plastic foam. During the crushing process, it reduces the problem of reduced crushing efficiency caused by the plastic foam jumping inside the crushing chamber 2, thereby improving the crushing efficiency.

[0064] The crushing device includes a body 1 placed on the ground. Inside the body 1, there is a crushing chamber 2, a feed inlet 3, and a discharge outlet 4. Both the feed inlet 3 and the discharge outlet 4 are connected to the crushing chamber 2, and the feed inlet 3 is provided with a feed end for feeding.

[0065] The crushing chamber 2 is equipped with a crushing wheel 5, which rotates to crush the plastic.

[0066] The crushing device also includes:

[0067] A guide groove 21 is provided along the crushing wheel 5. One end of the guide groove 21 extends to the bottom of the crushing wheel 5, and the other end extends toward the middle of the crushing wheel 5. Air enters the interior of the guide groove 21 from the bottom of the crushing wheel 5 and pushes the plastic foam to adhere to the surface of the crushing wheel 5 when it flows out through the guide groove 21.

[0068] The conveying assembly 6 is located at the discharge port 4 and extends into the crushing chamber 2. The crushing efficiency of the conveying assembly 6 is determined based on the weighing of the plastic foam.

[0069] The crushing wheel 5 is composed of multiple crushing cutter heads 22, which are arranged in descending order of size to form a stepped crushing wheel 5. Adjacent crushing wheels 5 are arranged in opposite directions and rotate in opposite directions, forming a crushing gap 23 between the crushing wheels 5. Plastic foam enters the bottom of the machine body 1 through the crushing gap 23.

[0070] In one feasible approach, because plastic foam is relatively lightweight, it is easily affected by airflow during the crushing process. By controlling the airflow, the plastic foam can be more tightly adhered to the surface of the crushing wheel 5, reducing vibration and thus improving crushing efficiency. This makes the actual crushing efficiency of the crushing device closer to the theoretical crushing efficiency, ensuring stable crushing of the plastic foam within the crushing chamber 2.

[0071] The stepped design of the crushing head 22 not only increases the crushing area but also optimizes the force distribution of the material, further improving the crushing effect. The side of the crushing head 22 is parallel to the central axis of the crushing wheel 5, and the crushing gap 23 formed by the crushing head 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 crush into fine particles.

[0072] The internal crushing chamber 2 of 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 the guide channel 21 and the crushing gap 23. The crushed plastic foam enters the second crushing chamber 2 and is pushed to the discharge port 4 by the conveying component 6.

[0073] See Figure 1-2 As shown, in one embodiment, a drive device is provided on the outside of 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 provided at both ends of the crushing wheel 5 to support the crushing wheel 5. The support members 8 are installed on the inside of the machine body 1, and the drive device is fixed on the outside of the machine body 1.

[0074] In one feasible embodiment, the support member 8 serves to support the crushing wheel 5, ensuring that the crushing wheel 5 is stable and does not wobble when operating at high speed. 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.

[0075] See Figure 6-8 As shown, in one embodiment, the support member 8 includes a fixed bracket 81 installed inside the body 1 and an adjustable buckle plate 82. The two ends of the crushing wheel 5 extend to the inner side of the buckle plate 82. The fixed bracket 81 has a guide groove 83, and the crushing wheel 5 slides along the guide groove 83 to change the position of the crushing wheel 5.

[0076] In one feasible approach, the position of the crushing wheel 5 is fine-tuned via 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.

[0077] Optionally, the guide groove 83 is set vertically to change the vertical height of the crushing wheel 5. Since there are at least two crushing wheels 5, adjusting the height of one crushing wheel 5 alone can adjust the size of the crushing gap 23, while adjusting both crushing wheels 5 at the same time can change the size of the first part and the second part of the crushing chamber 2.

[0078] Alternatively, the guide groove 83 is set to be inclined, and the axis of the crushing wheel 5 is in the same plane parallel to the ground. At the same time, the height of the crushing wheel 5 can be adjusted to change the crushing gap 23 between the crushing wheels 5.

[0079] The movement direction of the buckle plate 82 is consistent with the extension 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. The buckle plate 82 slides in the sliding groove 86. The inner side of the buckle plate 82 is supported by a limit block 85 by a spring 84. The limit block 85 and the sliding groove 86 cooperate to fix the buckle plate 82. The buckle plate 82 is provided with bolts to limit the distance between the buckle plate 82 and the sliding groove 86.

[0080] See Figure 9-12 As shown, in one embodiment, an air supply unit 221 is configured inside the body 1. The air supply unit 221 is connected to the guide channel 21 and supplies air into the guide channel 21. The air flow section of the guide channel 21 extends into the breaking gap 23.

[0081] The machine body 1 is equipped with a mesh cover 24, which is located at the air inlet of the air supply unit 221. The air circulates inside the machine body 1, and the broken plastic moves with the air inside the machine body 1.

[0082] In one feasible method, the air supply unit 221 is configured to supply air to the guide channel 21. That is, during use, the air supply unit 221 is used to transport air from the guide channel 21 to the first part of the crushing chamber 2, so that the air forms a high-speed airflow in the crushing gap 23, which effectively drives the plastic foam into the crushing gap 23, thereby improving the crushing efficiency. The air supply unit 221 can adjust the wind speed according to the crushing requirements.

[0083] Since plastic foam has the problem of electrostatic adsorption, airflow can effectively reduce the electrostatic adsorption of plastic foam, ensuring that plastic foam can smoothly enter the crushing gap 23 and flow in the second part of the crushing chamber 2.

[0084] See Figure 11-12 As shown, in one embodiment, the mesh cover 24 is provided with support bodies 25 on both sides. The support bodies 25 are used to limit the shape of the mesh cover 24. The support bodies 25 are elastically configured. The mesh cover 24 is configured with two types of mesh holes: the side closer to the air supply unit 221 has large mesh holes, and the side closer to the crushing wheel 5 has small mesh holes.

[0085] In one feasible method, the mesh cover 24 is configured with two mesh sections: the large mesh section facilitates air circulation, allowing air to be drawn in by the air supply unit 221 through the large mesh section, and the small mesh section, in conjunction with the plastic foam, promotes airflow in the area between the mesh covers 24, guiding the plastic foam.

[0086] The support body 25 can restrict the mesh cover 24 to a specific state, and the elasticity of the support body 25 can ensure that the mesh cover 24 can swing within a certain range to adapt to the changes in airflow when different crushing needs are met, so as to ensure that the mesh cover 24 is always in the best working state and improve the crushing effect.

[0087] In another embodiment, based on the elastic properties of the support body 25, the swing amplitude of the mesh cover 24 is increased by airflow during the operation of the air supply unit 221. A magnet 222 is provided on one side of the upper part of the support body 25, and the part that cooperates with the magnet 222 is magnetic. During the operation of the air supply unit 221, the mesh cover 24 is gradually pulled, causing it to move towards the air supply unit 221. When it moves to a certain position, the magnet 222 and the magnetic part repel each other and cooperate with the shaking of the mesh cover 24, causing the mesh cover 24 to vibrate significantly, which is used to break up the foam and reduce the adhesion of the foam.

[0088] See Figure 13-14 As shown, in one embodiment, the conveying component 6 includes:

[0089] The conveyor belt 61 extends into the crushing chamber 2. The conveyor belt 61 is driven by the drive device 62 through the conveyor roller. The conveyor belt 61 is recessed, and a scraper 63 is provided at one end of the conveyor belt 61 extending to the outside of the machine body 1. The scraper 63 is attached to the surface of the conveyor belt 61 and is inclined.

[0090] The pressure monitoring unit 64 is located at the bottom of the conveyor belt 61 to acquire pressure data changes when the conveyor belt 61 conveys plastic foam, and determines the actual crushing efficiency based on the pressure data changes.

[0091] In one feasible embodiment, the concave design of the conveyor belt 61 effectively prevents foam overflow, and the inclined angle of the scraper 63 optimizes foam guidance, ensuring efficient conveying. The scraper 63 can be used for subsequent processing such as packaging of the broken foam.

[0092] The pressure monitoring unit 64 provides real-time data feedback. Under a constant feeding speed, the crushing efficiency can be determined by analyzing pressure changes. Increased pressure indicates improved crushing effect, while decreased pressure indicates that the crushing effect does not meet expectations. Based on this data, the crushing parameters and the air speed of the air supply unit 221 are adjusted to ensure a stable and efficient crushing process.

[0093] See Figure 11-12 As shown, in one embodiment, the air supply unit 221 includes:

[0094] Fan 223 is installed inside the body 1. The air inlet side of fan 223 faces the mesh cover 24, and the air outlet side faces the guide groove 21.

[0095] The guide pipe 224 connects the fan 223 and the guide channel 21. An electrically controlled valve 225 for adjusting the air volume is configured in the middle of the guide pipe 224. The electrically controlled valve 225 adjusts the air volume distribution of the guide pipe 224 to the guide channel 21.

[0096] In one feasible method, 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 of each area of ​​the guide channel 21 can be precisely controlled to ensure that the air volume is evenly distributed. The adjustment of the air volume of each guide channel 21 can be reasonably set for the foam density of different areas.

[0097] Since the ventilation volume of the crushing gap 23 is fixed, when the air volume of the guide channel 21 increases, some foam will be quickly blown away, reducing accumulation and improving crushing uniformity; conversely, when the air volume decreases, the foam stays in the crushing gap 23 for a longer time, resulting in finer crushing and ensuring that the overall crushing effect reaches the optimal level.

[0098] See Figure 4 as well as Figure 9-10 As shown, in one embodiment, an adjustable guide plate 226 is provided at one end of the guide channel 21 extending to the upper part of the crushing wheel 5. The guide plate 226 is located inside the machine body 1 and restricts the angle at which air flows out of the guide channel 21. An adjustment member 227 is provided on the back of the guide plate 226 for fine-tuning the angle of the guide plate 226.

[0099] In one feasible approach, fine-tuning the angle of the guide vane 226 can precisely control the airflow direction, optimize the distribution of foam in the crushing wheel 5, and ensure uniform utilization of the crushing gap 23. The staggered crushing gap 23 effectively avoids foam accumulation and improves crushing efficiency.

[0100] The change in the angle of the guide plate 226 corresponds to the range of the downward pressure foam, thus affecting the range of the plastic foam adhering to the crushing wheel 5.

[0101] Optionally, the back adjustment component 227 of the guide plate 226 uses the magnitude of the magnetic force of the electromagnetic block to control the swing angle of the guide plate 226. The change of the magnetic force of the electromagnetic block corresponds to the change in the size of the crushing gap 23. The position change of the two crushing wheels 5 is obtained, thereby determining the crushing gap 23 between the crushing wheels 5. The swing angle of the guide plate 226 is proportional to the magnetic force of the electromagnetic block. The change in the crushing gap 23 corresponds to the fineness of foam crushing. The coverage area of ​​the guide plate 226 after adjustment is based on the change in the fineness of the foam after crushing.

[0102] In one embodiment, the crushing gap 23 between the guide channel 21 and the crushing wheel 5 is always offset.

[0103] The staggered design of the guide channel is more suitable for the crushing wheel to press down the plastic foam.

[0104] In another embodiment, the guide channels are evenly distributed, and the airflow state is adjusted by changing the tilt angle of the guide plates.

[0105] This application also provides a crushing method for recycling waste plastics, used in the aforementioned crushing device, comprising the following steps:

[0106] The pre-treated plastic foam is conveyed into the crushing chamber 2 through the feed end;

[0107] The rotation of the crushing wheel 5 drives the crushing head 22 to rotate at high speed. The crushing head 22 rotates at high speed to cut the plastic foam. At the same time, the stepped crushing wheel 5 increases the shearing force on the plastic foam.

[0108] Air enters the guide channel 21 from the bottom of the crushing chamber 2 and flows out from the other end of the guide channel 21, forming a directional airflow that pushes the foam to be evenly distributed to the crushing gap 23. The crushing wheel 5 rotates continuously to crush the plastic foam.

[0109] The crushed plastic foam falls into the bottom of the crushing chamber 2 through the crushing gap 23. The conveying component 6 weighs the plastic foam to determine the crushing efficiency and then conveys the crushed plastic foam to the next stage.

[0110] In summary, the technical solutions disclosed in the above embodiments of the present invention have at least the following advantages:

[0111] In the crushing process, this application increases the airflow inside the crushing chamber to provide downward pressure on the plastic foam that is jumping inside the crushing chamber after crushing, so that the plastic foam can stably enter the inner side of the crushing gap, and the crushing of the plastic foam is achieved by the rotation of the crushing wheel.

[0112] This application uses a guide channel with adjustable airflow direction and a guide plate to adjust the direction and coverage position of the airflow ejected from the guide channel. This allows the position of the guide plate to be adjusted accordingly after the crushing gap is adjusted, thus determining a reasonable downforce and crushing state, and further reducing the error between the actual crushing efficiency and the theoretical crushing efficiency.

[0113] Due to the electrostatic properties of the plastic foam itself, the air supply unit and the guide channel work together to form an airflow path inside the machine. The airflow drives the plastic foam to move inside the machine, reducing the adhesion of the plastic foam inside the machine and further improving the fluidity of the plastic foam inside the machine.

[0114] A flexible mesh cover is installed and supported by a support structure to ensure the stability of the mesh cover's swing state. The elastic setting of the support structure, in conjunction with the air supply unit, causes the mesh cover to vibrate regularly, causing the plastic foam attached to the surface of the mesh cover to detach from the mesh cover and fall onto the conveyor belt to be transported to the outside of the machine.

[0115] Although the present invention has been disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A crushing device for recycling waste plastics, comprising a body (1) placed on the ground, wherein the body (1) is provided with a crushing chamber (2), a feed inlet (3) and a discharge outlet (4), the feed inlet (3) and the discharge outlet (4) are both connected to the crushing chamber (2), and a feed end is provided at the feed inlet (3) for feeding; The crushing chamber (2) is equipped with a crushing wheel (5), which rotates to crush the plastic. Its features are, The crushing device also includes: A guide groove (21) is provided along the crushing wheel (5). One end of the guide groove (21) extends to the bottom of the crushing wheel (5), and the other end extends toward the middle of the crushing wheel (5). Air enters the interior of the guide groove (21) from the bottom of the crushing wheel (5) and pushes the plastic foam to adhere to the surface of the crushing wheel (5) when it flows out through the guide groove (21). The conveying assembly (6) is located at the discharge port (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 multiple crushing cutter heads (22). The crushing cutter heads (22) are arranged in order from large to small to form a stepped crushing wheel (5). The adjacent crushing wheels (5) are arranged in opposite directions and rotate in opposite directions. A crushing gap (23) is formed between the crushing wheels (5). Plastic foam enters the bottom of the machine body (1) through the crushing gap (23).

2. The crushing device for recycling waste plastics according to claim 1, characterized in that, A drive device is installed on the outside of 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 installed 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 drive device is fixed outside the machine body (1).

3. The crushing device for recycling waste plastics according to claim 2, characterized in that, The support (8) includes a fixed bracket (81) installed inside the body (1) and an adjustable buckle (82). The two ends of the crushing wheel (5) extend to the inside of the buckle (82). The fixed bracket (81) has a guide groove (83). The crushing wheel (5) slides along the guide groove (83) to change the position of the crushing wheel (5).

4. The crushing device for recycling waste plastics according to claim 3, characterized in that, The machine body (1) is equipped with an air supply unit (221). The air supply unit (221) is connected to the guide channel (21) and supplies air to the inside of the guide channel (21). The air flow section of the guide channel (21) extends into the crushing gap (23). The machine body (1) is equipped with a mesh cover (24), which is located at the air inlet of the air supply unit (221). The air circulates inside the machine body (1), and the broken plastic moves inside the machine body (1) along with the air.

5. A crushing device for recycling waste plastics according to claim 4, characterized in that, The mesh cover (24) is provided with support bodies (25) on both sides. The support bodies (25) are used to limit the shape of the mesh cover (24). The support bodies (25) are elastically set. The mesh cover (24) is equipped with two types of mesh holes. The side closer to the air supply unit (221) has large mesh holes, and the side closer to the crushing wheel (5) has small mesh holes.

6. A crushing device for recycling waste plastics according to claim 5, characterized in that, The conveying assembly (6) includes: The conveyor belt (61) extends into the crushing chamber (2). The conveyor belt (61) is driven by the drive device (62) through the conveyor roller. The conveyor belt (61) is recessed, and a scraper (63) is provided at one end of the conveyor belt (61) extending to the outside of the machine body (1). The scraper (63) is attached to the surface of the conveyor belt (61) and is inclined. The pressure monitoring unit (64) is set at the bottom of the conveyor belt (61) to obtain pressure data changes when the conveyor belt (61) conveys plastic foam, and determines the actual crushing efficiency based on the pressure data changes.

7. A crushing device for recycling waste plastics according to claim 6, characterized in that, The air supply unit (221) includes: A fan (223) is installed inside the body (1). The air inlet side of the fan (223) faces the screen (24), and the air outlet side faces the guide groove (21). The guide tube (224) connects the fan (223) and the guide channel (21). The middle of the guide tube (224) is equipped with an electric control valve (225) for adjusting the air volume. The electric control valve (225) adjusts the air volume distribution of the guide tube (224) to the guide channel (21).

8. A crushing device for recycling waste plastics according to claim 7, characterized in that, An adjustable guide plate (226) is provided at one end of the guide channel (21) extending to the upper part of the crushing wheel (5). The guide plate (226) is located inside the machine body (1) and restricts the angle at which air flows out of the guide channel (21). An adjustment piece (227) is provided on the back of the guide plate (226) for fine-tuning the angle of the guide plate (226).

9. A crushing device for recycling waste plastics according to claim 8, characterized in that, The crushing gap (23) between the guide channel (21) and the crushing wheel (5) is always staggered.

10. A method for crushing waste plastics, used in the crushing apparatus for recycling waste plastics as described in any one of claims 1-9, characterized in that, Includes the following steps: The pre-treated plastic foam is conveyed into the crushing chamber (2) through the feed end; The crushing wheel (5) rotates, driving 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) increases the shearing force on the plastic foam. Air enters the guide channel (21) from the bottom of the crushing chamber (2) and flows out from the other end of the guide channel (21), forming a directional airflow that pushes the foam to be evenly distributed to the crushing gap (23). The crushing wheel (5) rotates continuously 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 component (6) weighs the plastic foam, determines the crushing efficiency, and conveys the crushed plastic foam to the next stage.

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