An extrusion device for recycling waste plastics

Abstract

The application discloses an extrusion equipment for recycling and processing waste plastics, and relates to the technical field of plastic recycling, which comprises a plastic extrusion assembly and a melting treatment mechanism, the melting treatment mechanism is arranged at the discharging end of the plastic extrusion assembly, the melting treatment mechanism comprises a melting treatment bin fixedly connected to the discharging end of the plastic extrusion assembly, a feeding pipe is fixedly and internally arranged at the front end of the melting treatment bin, the feeding pipe is connected with the plastic extrusion assembly, a discharging pipe is fixedly and internally arranged at the rear end of the melting treatment bin, a plurality of flattening pipes are in communication between the discharging pipe and the feeding pipe, the plurality of flattening pipes are all in flat "S" shape structure, a plurality of heating rods are fixedly connected to the inside of the melting treatment bin, and the plurality of heating rods are respectively matched with the bending positions of the flattening pipes, so as to solve the problems of uneven melting and unmelted particles caused by the difference in melting speed when mixed waste plastics are extruded.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, and more specifically, to an extrusion apparatus for recycling and processing waste plastics. Background Technology

[0002] Waste plastic recycling and processing extrusion equipment is a mechanical device used to melt and recycle post-consumer or post-industrial waste plastics. As the basic equipment for the physical recycling of waste plastics, this equipment mainly realizes the processes of conveying, melting, plasticizing, filtering and extruding waste plastic raw materials through screw extrusion, and finally transforms them into plastic melt, plastic strips or granular recycled raw materials, providing secondary raw materials that can replace virgin plastics for downstream plastic product processing.

[0003] Waste plastics often contain a mixture of different types, such as polyethylene, polypropylene, polyvinyl chloride, and polyester. These plastics have different softening points, complete melting temperatures, and melting rates. During the extrusion process, it's easy for some plastics to melt while others remain unmelted and in a hard, granular state. This phenomenon directly results in unmelted particles being trapped in the melt. These hard particles are then encapsulated by the melted plastic, forming a soft-encased-hard structure, and ultimately remain in the extruded product, severely affecting the quality of the finished product. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide an extrusion device for waste plastic recycling and processing, so as to solve the problems of uneven melting and unmelted particles caused by differences in melting speed during the extrusion of mixed waste plastics.

[0005] To solve the above problems, the present invention adopts the following technical solution: An extrusion device for recycling and processing waste plastics includes a plastic extrusion assembly and a melting treatment mechanism. The melting treatment mechanism is disposed at the discharge end of the plastic extrusion assembly. The melting treatment mechanism includes a melting treatment chamber fixedly connected to the discharge end of the plastic extrusion assembly. A feed pipe is fixedly inserted inside the front end of the melting treatment chamber and is connected to the plastic extrusion assembly. A discharge pipe is fixedly inserted inside the rear end of the melting treatment chamber. Multiple leveling pipes are connected between the discharge pipe and the feed pipe.

[0006] Furthermore, all of the flattening tubes have a flat "S"-shaped structure, and multiple heating rods are fixedly connected inside the melting chamber, with each heating rod fitting against the bend of the flattening tube.

[0007] Furthermore, multiple diverting blades are fixedly inserted inside the multiple flattening tubes.

[0008] Furthermore, it also includes a pressure control mechanism, which is located at the rear end of the melt processing chamber. The pressure control mechanism includes a pressure control chamber connected to the rear end of the discharge pipe. The rear end of the pressure control chamber is connected to an extrusion pipe. Multiple support plates are fixedly connected inside the pressure control chamber. A support circular plate is fixedly connected to one end of the multiple support plates that are close to each other. A pressure control spring is fixedly connected to the front surface of the support circular plate. A pressure control plug is fixedly connected to the front end of the pressure control spring. The pressure control plug has a frustum-shaped structure.

[0009] Furthermore, a folded tube is fixedly connected between the pressure control plug and the support circular plate, and the pressure control spring is located inside the folded tube.

[0010] Furthermore, it also includes a cooling mechanism, which is located at the rear end of the pressure control chamber. The cooling mechanism includes a cooling chamber connected to the extrusion tube. A partition is fixedly connected inside the cooling chamber to divide the cooling chamber into front and rear spaces. A ventilation hole is opened through the interior of the front space of the cooling chamber, and a cooling fan is fixedly installed inside the front space of the cooling chamber.

[0011] Furthermore, a water inlet pipe is fixedly inserted inside the top of the rear space of the cooling chamber, and a water outlet pipe is fixedly inserted inside the bottom of the rear space of the cooling chamber. The water inlet pipe is connected to an external water source to replenish cooling water into the cooling chamber, and the water outlet pipe is used to discharge the cooling water inside the cooling chamber. Both the partition and the rear end of the cooling chamber are provided with discharge holes, and the rear ends of the two discharge holes are connected to waterproof rubber rings. The waterproof rubber rings have a structure that is wide at the front end and narrow at the rear end.

[0012] Furthermore, it also includes an output traction mechanism, which is located at the rear end of the cooling chamber. The output traction mechanism includes a base plate fixedly connected to the bottom of the cooling chamber. A first support frame is fixedly connected to the upper surface of the base plate. A motor is fixedly connected to the top of the first support frame. An active conveying wheel is fixedly connected to the output shaft of the motor. Two support plates are fixedly connected to the upper surface of the base plate. A passive conveying wheel is rotatably connected between the two support plates. The active conveying wheel is rotatably connected to the two support plates. The active conveying wheel is located above the passive conveying wheel. A second air supply pipe is fixedly inserted inside the active conveying wheel. Multiple long support pipes are fixedly inserted inside the active conveying wheel. The ends of the multiple long support pipes that are close to each other are connected to the second air supply pipe, and the ends of the multiple long support pipes that are far from each other are connected to a suction cup.

[0013] Furthermore, a second support frame is fixedly connected to the upper surface of the base plate, and an air pump is fixedly connected to the top of the second support frame. The air inlet of the air pump is connected to a first air supply pipe, and the first air supply pipe and the second air supply pipe are rotatably connected and interconnected through a rotary joint.

[0014] Furthermore, an arc-shaped guide plate is connected to one end of the support tube near the suction cup, and a connecting suction hole is opened between the arc-shaped guide plate and the support tube. A bracket is fixedly connected to the surface of the support plate, a push spring is fixedly connected to one end of the bracket near the support tube, a push frame is fixedly connected to one end of the push spring away from the bracket, a guide plate is fixedly connected to the surface of the push frame, the guide plate is slidably inserted into the interior of the bracket, a blocking membrane is fixedly connected between the two arm ends of the push frame, and a support roller is rotatably connected to both arm ends of the push frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) This scheme introduces plastic into a flat tube with a flat structure, making the plastic flat and thinner to increase the heating area. It also combines heating rods for auxiliary heating and uses flow divider blades to cut the softened plastic into smaller parts, further increasing the heating area and effectively reducing the phenomenon of uneven plastic melting. This lays the foundation for subsequent molding and improves the production quality of subsequent plastics.

[0016] (2) This scheme utilizes the linkage between the pressure control plug and the pressure control spring in the pressure control chamber to automatically adjust the gap between the inclined surface of the control plug and the chamber wall according to the plastic output pressure, thereby achieving dynamic balance and stability of the extrusion pressure, preventing the extruded strip from being sometimes thick and sometimes thin due to uneven pressure, thus avoiding uneven pelleting in the subsequent process and ensuring the quality of plastic production.

[0017] (3) This solution adopts a segmented cooling method, which first uses a cooling fan for air cooling and then uses cooling water for water cooling. This effectively prevents the material strip from becoming dense due to the rapid cooling speed, which causes the surface to solidify instantly and form a hard shell while the core remains a high-temperature melt. This ensures uniform cooling of the material strip and a dense internal structure, thereby improving the production quality of the material strip.

[0018] (4) This solution sets up suction cups on the active conveyor wheel. The suction cups are drawn by an air pump to create negative pressure when they come into contact with the material strip. With the help of the push spring, the blocking membrane and the arc-shaped guide plate, the suction cups can automatically adhere and detach at the designated position, ensuring that the material strip does not slip during the traction and conveying process, ensuring timely and stable feeding, thereby improving the uniformity of subsequent cutting and production quality. (5) Existing strip traction methods mostly use physical clamping and extrusion by rollers. For strips that have just been water-cooled, have a water film on the surface, and may not be completely hardened inside, roller extrusion can easily cause the strip to deform and lose its roundness. In addition, the water film can cause serious slippage of the traction wheel. This invention uses dynamic bonding negative pressure adsorption to replace rigid mechanical extrusion, which avoids strip deformation and eliminates the slippage interference caused by the surface water film, thus ensuring stable traction at a constant linear speed. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the melt processing chamber of the present invention; Figure 3 This is a schematic diagram of the internal structure of the pressure control chamber of the present invention; Figure 4 This is a schematic diagram of the internal structure of the cooling chamber of the present invention; Figure 5 This is a schematic diagram of the output traction mechanism of the present invention; Figure 6 This is a schematic diagram of the air pump part of the present invention; Figure 7 This is a schematic diagram of the active conveyor wheel portion of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle; Figure 9 This is a schematic diagram of the structure of the supporting long tube part of the present invention.

[0020] Explanation of the labels in the diagram: 1. Plastic extrusion assembly; 101. Base plate; 201. Melting chamber; 202. Heating rod; 203. Feed pipe; 204. Leveling pipe; 205. Discharge pipe; 206. Diverter blade; 301. Pressure control chamber; 302. Extrusion tube; 303. Support circular plate; 304. Folded tube; 305. Pressure control plug; 306. Pressure control spring; 307. Support plate; 401. Cooling chamber; 402. Inlet pipe; 403. Outlet pipe; 404. Waterproof rubber ring; 405. Vent hole; 406. Cooling fan; 407. Partition; 501. Motor; 502. Air pump; 503. First support frame; 504. Second support frame; 505. Support plate; 506. Passive conveyor wheel; 507. Active conveyor wheel; 508. Rotary joint; 509. First air supply pipe; 510. Second air supply pipe; 511. Suction cup; 512. Support tube; 513. Bracket; 514. Guide plate; 515. Push spring; 516. Arc-shaped guide plate; 517. Push frame; 518. Support roller; 519. Blocking membrane. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 and Figure 2 An extrusion device for recycling and processing waste plastics includes a plastic extrusion assembly 1 and a melting treatment mechanism. The melting treatment mechanism is disposed at the discharge end of the plastic extrusion assembly 1. The melting treatment mechanism includes a melting treatment chamber 201 fixedly connected to the discharge end of the plastic extrusion assembly 1. A feed pipe 203 is fixedly inserted inside the front end of the melting treatment chamber 201 and is connected to the plastic extrusion assembly 1. A discharge pipe 205 is fixedly inserted inside the rear end of the melting treatment chamber 201. A plurality of leveling pipes 204 are connected between the discharge pipe 205 and the feed pipe 203.

[0023] The multiple leveling tubes 204 are all flat "S" shaped structures. Multiple heating rods 202 are fixedly connected inside the melting treatment chamber 201. The multiple heating rods 202 are respectively attached to the bends of the leveling tubes 204. Multiple flow-diverting blades 206 are arranged alternately inside the multiple leveling tubes 204 along the material flow direction. The longitudinal section of the flow-diverting blades 206 is a streamlined structure with a sharp front end and a smooth rear end, and the blade body is parallel to the central axis of the leveling tubes 204.

[0024] By adopting the above technical solution, during plastic recycling, the plastic is heated and melted by the heating component in the plastic extrusion assembly 1, and then extruded through the screw and other extrusion conveying components. This is a common method in the prior art and will not be elaborated further here. After extrusion, the plastic enters the feed pipe 203. Due to the high pressure during plastic extrusion, the plastic gradually enters multiple leveling pipes 204, allowing it to flow within them. Because the leveling pipes 204 have a flat structure, the plastic is flattened and thinned after entering them, increasing the heating area. Simultaneously, the heating rod 202 heats the plastic, melting any parts that are not yet fully melted and reducing uneven melting. As the plastic flows through the flattening tube 204, it passes through the flow divider blades 206. Through this streamlined staggered arrangement, the flow divider blades 206 can longitudinally cut and divide the high-viscosity softened plastic to increase the heating area, while minimizing the material's flow resistance, preventing the material from stagnating and blocking in the flat tube, further increasing the heating area of ​​the plastic, and reducing the phenomenon of uneven plastic melting.

[0025] like Figure 3 As shown, it also includes a pressure control mechanism, which is located at the rear end of the melt processing chamber 201. The pressure control mechanism includes a pressure control chamber 301 connected to the rear end of the discharge pipe 205. The rear end of the pressure control chamber 301 is connected to an extrusion pipe 302. Multiple support plates 307 are fixedly connected inside the pressure control chamber 301. A support circular plate 303 is fixedly connected to one end of the multiple support plates 307 that are close to each other. A pressure control spring 306 is fixedly connected to the front surface of the support circular plate 303. The front end of the pressure control spring 306 is fixedly connected to... A pressure control plug 305 is provided, which has a frustum-shaped structure. A folded tube 304 is fixedly connected between the pressure control plug 305 and the supporting circular plate 303. The pressure control spring 306 is located inside the folded tube 304. The pressure control spring 306 is physically isolated from the high-temperature melt by the retractable folded tube 304, which not only prevents the melt from entering the gap of the spring coil and causing the action to be stuck, but also transmits the melt pressure to the pressure control spring 306 in real time through the flexible axial expansion and contraction of the folded tube 304, ensuring that the pressure control plug 305 can be sensitively displaced with the extrusion pressure fluctuation.

[0026] By adopting the above technical solution, the molten plastic enters the pressure control chamber 301 through the discharge pipe 205. When the pressure of the plastic output is too high, the pressure control plug 305 can be pushed backward to increase the gap between the inclined surface of the pressure control plug 305 and the pressure control chamber 301, thereby reducing the pressure of the plastic flow. When the pressure of the plastic output is low, the pressure control spring 306 in a compressed state can push the pressure control plug 305 forward to reduce the gap between the inclined surface of the pressure control plug 305 and the pressure control chamber 301, thereby increasing the pressure of the plastic flow. This can keep the pressure of plastic extrusion stable and prevent uneven pressure during plastic extrusion, which would result in uneven plastic extrusion and uneven pelleting, thus affecting the production quality of the plastic.

[0027] like Figure 4 As shown, it also includes a cooling mechanism, which is located at the rear end of the pressure control chamber 301. The cooling mechanism includes a cooling chamber 401 connected to the extrusion pipe 302. A partition 407 is fixedly connected inside the cooling chamber 401. The partition 407 is used to divide the cooling chamber 401 into front and rear spaces. A vent 405 is provided through the interior of the front space of the cooling chamber 401. A cooling fan 406 is fixedly installed inside the front space of the cooling chamber 401.

[0028] The cooling chamber 401 has an inlet pipe 402 fixedly inserted inside the top of its rear space and an outlet pipe 403 fixedly inserted inside the bottom of its rear space. The inlet pipe 402 is connected to an external water source to replenish cooling water into the cooling chamber 401, and the outlet pipe 403 is used to discharge the cooling water from the cooling chamber 401. Both the partition 407 and the rear end of the cooling chamber 401 have discharge holes, and the rear ends of both discharge holes are connected to waterproof rubber rings 404. The waterproof rubber rings 404 have a structure that is wide at the front end and narrow at the rear end. By tightly fitting the waterproof rubber rings 404 to the material strip, the probability of cooling water seeping out of the rear space of the cooling chamber 401 is reduced, thus improving the sealing performance of the rear space of the cooling chamber 401.

[0029] By adopting the above technical solution, the plastic is discharged from the pressure control chamber 301 to the extrusion tube 302, shaped and discharged through the extrusion tube 302 into the front space of the cooling chamber 401. Then, the heat of the plastic surface is carried away by the cooling fan 406 to cool it down, so that the plastic is initially cooled to form a strip. The strip then enters the rear space of the cooling chamber 401. Cooling water is transported to the cooling chamber 401 through the water inlet pipe 402 to cool the strip. By first using air cooling and then using cooling water for cooling and shaping, the strip can be prevented from cooling down too quickly and causing the strip to solidify instantly, forming a hard shell. However, the core is still a high-temperature melt. When it continues to cool and shrink, the volume decreases, while the outer hard shell has already been shaped and cannot shrink with it, resulting in the strip being not dense inside and affecting the production quality of the strip.

[0030] like Figures 5-9 As shown, it also includes an output traction mechanism, which is located at the rear end of the cooling chamber 401. The output traction mechanism includes a base plate 101 fixedly connected to the bottom of the cooling chamber 401. A first support frame 503 is fixedly connected to the upper surface of the base plate 101. A motor 501 is fixedly connected to the top of the first support frame 503. An active conveying wheel 507 is fixedly connected to the output shaft of the motor 501. Two support plates 505 are fixedly connected to the upper surface of the base plate 101, and the two support plates 505 are rotatably connected. A passive conveying wheel 506 is connected to the active conveying wheel 507, which is rotatably connected to the two support plates 505. The active conveying wheel 507 is located above the passive conveying wheel 506. A second air supply pipe 510 is fixedly inserted inside the active conveying wheel 507. A plurality of support tubes 512 are fixedly inserted inside the active conveying wheel 507. The ends of the plurality of support tubes 512 that are close to each other are connected to the second air supply pipe 510, and the ends of the plurality of support tubes 512 that are far from each other are connected to a suction cup 511.

[0031] The base plate 101 has a second support frame 504 fixedly connected to its upper surface. An air pump 502 is fixedly connected to the top of the second support frame 504. The air inlet of the air pump 502 is connected to a first air supply pipe 509. The first air supply pipe 509 and the second air supply pipe 510 are rotatably connected and interconnected via a rotary joint 508. An arc-shaped guide plate 516 is connected to one end of the support tube 512 near the suction cup 511. A connecting suction hole is formed between the arc-shaped guide plate 516 and the support tube 512. A bracket 513 is fixedly connected to the surface of plate 505. A push spring 515 is fixedly connected to one end of the bracket 513 near the support tube 512. A push frame 517 is fixedly connected to the other end of the push spring 515 away from the bracket 513. A guide plate 514 is fixedly connected to the surface of the push frame 517. The guide plate 514 is slidably inserted into the interior of the bracket 513. A blocking membrane 519 is fixedly connected between the two arm ends of the push frame 517. A support roller 518 is rotatably connected to both arm ends of the push frame 517.

[0032] By adopting the above technical solution, during the plastic extrusion process, it is necessary to traction the plastic strip. During traction, the strip needs to be positioned between the active conveying wheel 507 and the passive conveying wheel 506. The active and passive conveying wheels 507 and 506 clamp the strip. Then, the motor 501 drives the active conveying wheel 507 to rotate, thereby traction and conveying the strip. During the rotation of the active conveying wheel 507, the suction cup 511 presses against the surface of the strip, making the suction cup 511 adhere to the strip. At the same time, the air pump 502 sucks out the air from the suction cup 511, allowing the suction cup 511 to adhere to the surface of the strip. This reduces the slippage of the strip during conveying, avoids adverse effects on the uniformity of subsequent pelletizing due to untimely feeding, and thus improves the production quality of plastic.

[0033] During the conveying process of the material strip, only the bottom suction cup 511 contacts and adheres to the material strip. As the bottom suction cup 511 moves to fit against the material strip, the arc-shaped guide plate 516 and the support roller 518 will squeeze and roll until the compressed push spring 515 pushes the blocking membrane 519 to adhere to the air suction hole on the arc-shaped guide plate 516. Then, the continuous suction of the air pump 502 will make the suction cup 511 adhere to the material strip. As the active conveying wheel 507 continues to rotate, the blocking membrane 519 will detach from the air suction hole on the arc-shaped guide plate 516, at which point the air suction hole will be exposed. The suction port is connected to the external atmosphere. Its effective flow area is significantly larger than the suction diameter of the second air supply pipe 510, ensuring that the rate at which external air enters the suction cup 511 is much greater than the residual suction rate of the air pump 502. This allows the adsorption chamber to instantly return to atmospheric pressure, enabling rapid detachment of the suction cup 511 from the material strip. When the suction cup 511 detaches from the work station, the blocking membrane 519 opens the suction port, allowing external air to rapidly flow into the suction cup, instantly disrupting the vacuum negative pressure environment within the suction cup. This ensures that the suction cup 511 can smoothly and quickly detach from the material strip surface, preventing adhesion and jamming. Simultaneously, the adsorption cavity formed by the suction cup 511 and the material strip surface has a very small volume, allowing it to quickly depressurize the moment external air enters, completing the detachment.

[0034] Instructions for use: First, the plastic is heated and melted by the heating component in the plastic extrusion assembly 1, and then extruded by the screw and other extrusion conveying components; Subsequently, the extruded high-pressure plastic enters the feed pipe 203 and then enters multiple flattening pipes 204 to be flattened and thinned. At the same time, the plastic is heated by the heating rod 202, so that the plastic that has not been completely melted continues to melt. Next, as the plastic flows in the spreading tube 204, it passes through the flow divider blade 206, which cuts the softened plastic to reduce its volume and further increase the heated area. Next, the molten plastic enters the pressure control chamber 301 through the discharge pipe 205. When the pressure is too high, the plastic pushes the pressure control plug 305 to move backward, increasing the gap between the inclined surface of the pressure control plug 305 and the pressure control chamber 301 to reduce the pressure. When the pressure is too low, the pressure control spring 306, which is in a compressed state, pushes the pressure control plug 305 to move forward, narrowing the gap to increase the pressure, thereby keeping the pressure during plastic extrusion stable. Subsequently, the plastic is discharged from the pressure control chamber 301 to the extrusion tube 302. After being shaped by the extrusion tube 302, it is discharged to the front space of the cooling chamber 401. The cooling fan 406 carries away the heat from the surface of the plastic for initial air cooling, so that the plastic forms a strip. Subsequently, the strip enters the rear space of the cooling chamber 401, where it is further cooled and shaped by the cooling water supplied by the water inlet pipe 402; Next, the material strip is positioned between the active conveyor wheel 507 and the passive conveyor wheel 506, and is clamped between the two wheels. The motor 501 drives the active conveyor wheel 507 to rotate for traction and conveying. When the active conveyor wheel 507 rotates, the suction cup 511 presses against the surface of the material strip and adheres to the material strip. The air pump 502 sucks out the air from the suction cup 511, so that the suction cup 511 adheres to the surface of the material strip to reduce slippage. As the active conveyor wheel 507 rotates, the bottom suction cup 511 contacts and adsorbs the material strip. During this process, the arc-shaped guide plate 516 and the support roller 518 squeeze and roll, and the compressed propulsion spring 515 pushes the blocking membrane 519 to stick to the air suction hole on the arc-shaped guide plate 516, so that the air pump 502 continuously draws to achieve adsorption. As the active conveyor wheel 507 continues to rotate, the blocking membrane 519 detaches from the suction cup 511, the air suction hole is exposed and air enters, causing the suction cup 511 to detach from the material strip. The next suction cup 511 repeats the above operation to achieve stable material strip conveying.

[0035] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An extrusion device for recycling and processing waste plastics, comprising a plastic extrusion assembly (1), characterized in that: It also includes a melting treatment mechanism, which is located at the discharge end of the plastic extrusion assembly (1). The melting treatment mechanism includes a melting treatment chamber (201) fixedly connected to the discharge end of the plastic extrusion assembly (1). A feed pipe (203) is fixedly inserted inside the front end of the melting treatment chamber (201). The feed pipe (203) is connected to the plastic extrusion assembly (1). A discharge pipe (205) is fixedly inserted inside the rear end of the melting treatment chamber (201). A plurality of leveling pipes (204) are connected between the discharge pipe (205) and the feed pipe (203).

2. The extrusion equipment for waste plastic recycling and processing according to claim 1, characterized in that: The multiple flattening tubes (204) are all flat "S" shaped structures. The interior of the melting chamber (201) is fixedly connected with multiple heating rods (202), and the multiple heating rods (202) are respectively attached to the bends of the flattening tubes (204).

3. The extrusion equipment for waste plastic recycling and processing according to claim 1, characterized in that: Multiple diverting blades (206) are fixedly inserted inside the multiple flattening tubes (204).

4. An extrusion device for recycling and processing waste plastics according to claim 1, characterized in that: It also includes a pressure control mechanism, which is located at the rear end of the melt processing chamber (201). The pressure control mechanism includes a pressure control chamber (301) connected to the rear end of the discharge pipe (205). The rear end of the pressure control chamber (301) is connected to an extrusion pipe (302). Multiple support plates (307) are fixedly connected inside the pressure control chamber (301). Support circular plates (303) are fixedly connected to one end of the multiple support plates (307) that are close to each other. A pressure control spring (306) is fixedly connected to the front surface of the support circular plate (303). A pressure control plug (305) is fixedly connected to the front end of the pressure control spring (306). The pressure control plug (305) has a frustum-shaped structure.

5. An extrusion device for recycling and processing waste plastics according to claim 4, characterized in that: A folded tube (304) is fixedly connected between the pressure control plug (305) and the support circular plate (303), and the pressure control spring (306) is located inside the folded tube (304).

6. An extrusion device for recycling and processing waste plastics according to claim 4, characterized in that: It also includes a cooling mechanism, which is located at the rear end of the pressure control chamber (301). The cooling mechanism includes a cooling chamber (401) connected to the extrusion tube (302). A partition (407) is fixedly connected inside the cooling chamber (401). The partition (407) is used to divide the cooling chamber (401) into two spaces, front and rear. A vent (405) is opened through the interior of the front space of the cooling chamber (401). A cooling fan (406) is fixedly installed inside the front space of the cooling chamber (401).

7. An extrusion device for recycling and processing waste plastics according to claim 6, characterized in that: A water inlet pipe (402) is fixedly inserted inside the top of the rear space of the cooling chamber (401), and a water outlet pipe (403) is fixedly inserted inside the bottom of the rear space of the cooling chamber (401). The water inlet pipe (402) is connected to an external water source to replenish cooling water to the interior of the cooling chamber (401), and the water outlet pipe (403) is used to discharge the cooling water inside the cooling chamber (401). The rear ends of the partition (407) and the cooling chamber (401) are both provided with discharge holes, and the rear ends of the two discharge holes are connected to waterproof rubber rings (404). The waterproof rubber rings (404) have a structure that is wide at the front end and narrow at the rear end.

8. An extrusion device for recycling and processing waste plastics according to claim 6, characterized in that: It also includes an output traction mechanism, which is located at the rear end of the cooling chamber (401). The output traction mechanism includes a base plate (101) fixedly connected to the bottom of the cooling chamber (401). A first support frame (503) is fixedly connected to the upper surface of the base plate (101). A motor (501) is fixedly connected to the top of the first support frame (503). An active conveyor wheel (507) is fixedly connected to the output shaft of the motor (501). Two support plates (505) are fixedly connected to the upper surface of the base plate (101). The two support plates (505) are rotatably connected to each other. A passive conveying wheel (506) is rotatably connected to the active conveying wheel (507) and the two support plates (505). The active conveying wheel (507) is located above the passive conveying wheel (506). A second air supply pipe (510) is fixedly inserted inside the active conveying wheel (507). A plurality of support tubes (512) are fixedly inserted inside the active conveying wheel (507). The ends of the plurality of support tubes (512) that are close to each other are connected to the second air supply pipe (510), and the ends of the plurality of support tubes (512) that are far from each other are connected to a suction cup (511).

9. An extrusion device for recycling and processing waste plastics according to claim 8, characterized in that: A second support frame (504) is fixedly connected to the upper surface of the base plate (101), and an air pump (502) is fixedly connected to the top of the second support frame (504). The air inlet of the air pump (502) is connected to a first air supply pipe (509). The first air supply pipe (509) and the second air supply pipe (510) are rotatably connected and interconnected through a rotary joint (508).

10. An extrusion device for recycling and processing waste plastics according to claim 8, characterized in that: The end of the support tube (512) near the suction cup (511) is connected to an arc-shaped guide plate (516). An air suction hole is opened between the arc-shaped guide plate (516) and the support tube (512). A bracket (513) is fixedly connected to the surface of the support plate (505). A push spring (515) is fixedly connected to the end of the bracket (513) near the support tube (512). A push frame (517) is fixedly connected to the end of the push spring (515) away from the bracket (513). A guide plate (514) is fixedly connected to the surface of the push frame (517). The guide plate (514) is slidably inserted into the inside of the bracket (513). A blocking membrane (519) is fixedly connected between the two arm ends of the push frame (517). A support roller (518) is rotatably connected to both arm ends of the push frame (517).

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