A waste plastic regeneration granulation device

Abstract

The utility model discloses a kind of waste plastics regeneration granulating device, including support base plate, extruding granulating box installed on support base plate, cooling box being set to the discharge port of extruding granulating box, air drying piece being installed on cooling box, pelletizer being set to the outer end portion of cooling box, located the particle collection box below the discharge port of pelletizer, extrusion drive assembly being set to the outside of extruding granulating box, and double-screw material mixing assembly being set to the inside of extruding granulating box and by extrusion drive assembly driven rotation, the discharge port end of the extruding granulating box is fixedly connected with discharge fixed block;Filtering mechanism is arranged on the discharge fixed block;High-pressure backflushing mechanism is arranged on the side of the extruding granulating box.The utility model belongs to the technical field of granulator, specifically refers to a kind of waste plastics regeneration granulating device.

Description

Technical Field

[0001] This utility model belongs to the field of granulator technology, specifically referring to a waste plastic recycling granulation device. Background Technology

[0002] In the field of waste plastic recycling, granulation equipment is a key piece of equipment for realizing the reprocessing of recycled plastics. Its core function is to melt and mix waste plastics and process them into qualified recycled plastic granules. Currently, existing granulation equipment has matured and possesses the basic functions of plastic melting and extrusion granulation, providing important technical support for the recycling of waste plastics and meeting the initial recycling processing needs in conventional scenarios. However, from the perspective of higher demands for improving product quality, optimizing operation and maintenance efficiency, and ensuring production continuity, there is still some room for further optimization in the practical application of existing equipment.

[0003] On the one hand, to ensure the quality of recycled plastic pellets, existing equipment is generally equipped with a filter structure to remove impurities from molten plastic, and this design concept has been widely recognized in the industry; however, most existing filter structures adopt a single filter design, which still has room for improvement in terms of the comprehensive filtration effect on impurities of different particle sizes, and some filter screens adopt an integrated fixing method, which can ensure the stability of the filtration process, but also makes the disassembly and assembly process of the filter screen relatively cumbersome, causing inconvenience for daily cleaning and replacement.

[0004] On the other hand, the decline in filtration efficiency due to the accumulation of impurities after long-term use is a common problem in the industry. Currently, some existing equipment is equipped with high-pressure cleaning structures to improve the shortcomings of manual cleaning. Such structures have achieved certain results in improving the convenience of cleaning. However, existing high-pressure cleaning structures often have problems such as incomplete cleaning coverage and easy to leave cleaning dead corners. Moreover, most of them do not have a synchronous drying mechanism. Even if high-pressure cleaning is used to replace manual disassembly and cleaning, cleaning liquid is still easy to remain on the surface of the filter screen after cleaning. It is necessary to dry for a long time before it can be used again. This process will still cause the equipment to be shut down for a certain period of time, which will have a certain impact on the continuity of production. Utility Model Content

[0005] To address the aforementioned problems of limited filter efficiency and long drying time after cleaning affecting production continuity, this utility model provides a waste plastic recycling and granulation device.

[0006] To achieve the above functions, the technical solution adopted by this utility model is as follows: a waste plastic recycling granulation device, including a supporting base plate, an extrusion granulation box installed on the supporting base plate, a cooling box set at the discharge port of the extrusion granulation box, an air drying component installed on the cooling box, a pelletizer set at the outer end of the cooling box, a pellet collecting box located below the discharge port of the pelletizer, an extrusion drive assembly set outside the extrusion granulation box, and a twin-screw material mixing assembly set inside the extrusion granulation box and driven to rotate by the extrusion drive assembly; The discharge port of the extrusion granulation box is fixedly connected to a discharge fixing block, and an extrusion head is installed at the outlet end of the discharge fixing block. The cooling box is located below the extrusion head. A filtration mechanism is provided on the discharge fixing block; A high-pressure backwashing mechanism is provided on one side of the extrusion granulation box.

[0007] Furthermore, the filtration mechanism includes a crossbar symmetrically fixed to the outer end of the discharge fixing block, a support plate fixed to the end of the crossbar, an opening and closing cylinder fixed to the support plate, a connecting block fixed to the end of the piston rod of the opening and closing cylinder, a lateral slot opened in the side wall of the discharge fixing block, and a filter plate fixed to the connecting block and slidingly engaged with the lateral slot.

[0008] Furthermore, the filter plate is detachably provided with a coarse filter plate, a medium-efficiency filter plate and a fine filter plate in sequence along the material flow direction, forming a three-stage filtration system; Each filter screen plate has a fixed base with threaded holes on both sides of its top.

[0009] Furthermore, the top of the filter plate is provided with an insertion slot corresponding to the coarse filter plate, the medium-efficiency filter plate and the fine filter plate, and the top of each insertion slot is provided with an adapter slot corresponding to the position of the fixing seat. The fixing seat is internally threaded with a fixing screw, the bottom end of which is screwed into the adapter groove, thereby realizing the detachable fixing installation of the coarse filter plate, medium efficiency filter plate and fine filter plate with the filter plate. The filter plate has a hollow structure in the middle.

[0010] Furthermore, the high-pressure backwashing mechanism includes a receiving box disposed on the discharge port side of the extrusion granulation box, a high-pressure pump body installed on the top of the receiving box, a high-pressure nozzle connected to the water outlet end of the high-pressure pump body, and a reciprocating assembly for driving the high-pressure nozzle to move. The high-pressure nozzle is mounted on the reciprocating assembly and can perform multi-directional reciprocating motion under its drive; The suction end of the high-pressure pump body extends to the bottom of the container.

[0011] Furthermore, the container has an L-shaped cross-section and is installed horizontally on the ground; The high-pressure pump body is located at the top of the vertical section of the housing.

[0012] Furthermore, a drying assembly is provided at the top of the vertical section of the container. The drying assembly includes a fan corresponding to the filter plate and an electric heating box fixedly covered at the fan outlet to heat the airflow.

[0013] Furthermore, the reciprocating assembly is disposed at the top of the horizontal end of the receiving box; The reciprocating assembly includes a support block symmetrically fixed to the top of the horizontal end of the receiving box, a first limiting rod symmetrically fixed between the two sets of support blocks, a first reciprocating cylinder fixed to the outer wall of one set of support blocks and parallel to the first limiting rod, a sleeve block slidably sleeved on the two sets of first limiting rods, a second reciprocating cylinder fixed to the top of the sleeve block, a second limiting rod fixed to both sides of the second reciprocating cylinder and parallel to it, an auxiliary block fixed to the top of the second limiting rod, and a moving block slidably sleeved on the second limiting rod. The piston rod of the first reciprocating cylinder moves through the support block and is fixedly connected to the sleeve block; The piston rod of the second reciprocating cylinder is fixed to the bottom of the moving block; The high-pressure nozzle is fixedly mounted on the movable block.

[0014] Furthermore, the side of the extrusion granulation box is moved away from the other side of the filtration mechanism for cleaning and is fixedly connected to a slag-blocking box with a side opening. The bottom of the slag-blocking box is designed with an inclined structure.

[0015] Furthermore, a slag collection box is provided below the bottom outlet of the slag blocking box, and the slag collection box is located on one side of the cooling box.

[0016] Compared with the prior art, the present invention achieves the following beneficial effects by adopting the above structure: 1. Through the coordinated design of the filtration mechanism, coarse filter plate, medium-efficiency filter plate, fine filter plate, insertion slot, adapter slot, and fixing screws, a dual technical effect of three-stage progressive filtration and convenient filter plate disassembly and assembly is achieved. The three-stage filtration system composed of coarse, medium, and fine filter plates can intercept impurities of different particle sizes layer by layer, resulting in more thorough filtration compared to existing single filtration structures, and significantly improving the purity and quality of recycled plastic particles. The combination design of insertion slots, adapter slots, and fixing screws enables the detachable fixing of each filter plate. Compared to the integrated fixing and cumbersome disassembly of existing technologies, the filter plates can be disassembled, cleaned, or replaced simply by turning the fixing screws. This not only reduces maintenance difficulty and labor intensity but also allows for flexible replacement of filter plates with different pore sizes according to the impurities of the waste plastic raw materials, greatly improving the adaptability and flexibility of the device.

[0017] 2. By combining the high-pressure backwashing mechanism and the air-drying component, the filter cleaning and drying processes are integrated. In this structure, the high-pressure backwashing mechanism can drive the high-pressure nozzle through the reciprocating component to fully cover the filter screen for thorough cleaning without dead angles. The filter screen can be cleaned without disassembly, greatly improving cleaning efficiency. The air-drying component can immediately dry the filter screen at high temperature after rinsing, avoiding the mixing of residual cleaning liquid on the filter screen surface with the subsequent molten plastic, which would affect product quality. At the same time, it can also quickly restore the filtration function of the filter screen, reduce equipment downtime, and ensure the continuity of production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a waste plastic recycling and granulation device proposed in this utility model; Figure 2 This is a cross-sectional view of a waste plastic recycling and granulation device proposed in this utility model; Figure 3 This is a partial structural diagram of a waste plastic recycling and granulation device proposed in this utility model. Figure 1 ; Figure 4 This is a partial structural diagram of a waste plastic recycling and granulation device proposed in this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the overall structure of the filter plate proposed in this utility model; Figure 6 for Figure 5 Enlarged view of a portion of point A in the middle.

[0019] The components include: 1. Support base plate; 11. Extrusion granulation box; 12. Extrusion drive assembly; 13. Twin-screw material mixing assembly; 14. Discharge fixing block; 15. Cooling box; 151. Drying component; 16. Filtration mechanism; 161. Crossbar; 162. Support plate; 163. Opening and closing cylinder; 164. Connecting block; 165. Side slot; 166. Filter plate; 1661. Coarse filter screen; 1662. Medium-efficiency filter screen; 1663. Fine filter screen; 1664. Fixing base; 16641. Fixing screw; 1665. Insertion groove; 1666. Adaptor groove; 167. 17. Extrusion head; 17. High-pressure backwashing mechanism; 171. Container box; 1711. Cover; 172. High-pressure pump body; 173. High-pressure nozzle; 174. Reciprocating assembly; 1741. Support block; 1742. First limit rod; 1743. First reciprocating cylinder; 1744. Sleeve block; 1745. Second reciprocating cylinder; 1746. Second limit rod; 1747. Auxiliary block; 1748. Moving block; 175. Air drying assembly; 1751. Fan; 1752. Electric heating box; 18. Slag baffle box; 181. Slag collection box; 19. Pelletizer; 191. Pellet collection box. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] like Figure 1-6 As shown, the present invention provides a waste plastic recycling and granulation device, including a supporting base plate 1, an extrusion granulation box 11 installed on the supporting base plate 1, a cooling box 15 located at the discharge port of the extrusion granulation box 11, a drying component 151 installed on the cooling box 15, a pelletizer 19 located at the outer end of the cooling box 15, a pellet collection box 191 located below the discharge port of the pelletizer 19, an extrusion drive assembly 12 located outside the extrusion granulation box 11, and a twin-screw material mixing assembly 13 located inside the extrusion granulation box 11 and driven to rotate by the extrusion drive assembly 12. The extrusion granulation box 11 is the core cavity for melting, mixing and extruding waste plastics. The extrusion drive assembly 12 provides high torque rotational power to the twin-screw material mixing assembly 13. The twin screws mesh and rotate in the same or opposite directions in the cavity to convey, compress, shear, mix and melt the input waste plastic raw materials, and finally transform the plastic into a uniform and well plasticized high-temperature melt. A discharge fixing block 14 is fixedly connected to the discharge port end of the extrusion granulation box 11. An extrusion head 167 is installed at the outlet end of the discharge fixing block 14. A cooling box 15 is located below the extrusion head 167. A filter mechanism 16 is provided on the discharge fixing block 14. When the high-temperature melt flows through this point under the thrust of the screw, the filter mechanism 16 can intercept and remove solid impurities such as unmelted particles, carbides, and metal shavings in the melt, realizing online purification of the melt and ensuring the purity and quality of subsequent granulation. The filtered clean plastic melt is extruded through the extrusion head 167 at the end of the discharge fixing block 14 to form a continuous plastic strip. The extruded plastic strips are then guided by the guide rollers in the cooling box 15 below to the cooling box 15. The cooling box 15 is filled with circulating cooling water to quickly cool and shape the high-temperature plastic strips, preventing them from sticking together and solidifying their shape. The cooled and solidified plastic strips are led out by a conveying device (such as a traction roller), and after passing through a drying unit 151 (such as a fan array) to blow away the residual moisture on the surface, they are conveyed to a pelletizer 19. Then, the rotating blades in the pelletizer 19 cut the continuous plastic strips into plastic granules of uniform size. The final finished granules fall into the pellet collection box 191 for collection, completing the entire recycling pelletizing process. A high-pressure backwashing mechanism 17 is also provided on one side of the extrusion granulation box 11. When the filter screen resistance increases due to the accumulation of impurities, this mechanism can be activated. The high-pressure backwashing mechanism 17 injects high-pressure fluid (such as high-pressure air or cleaning fluid) into the filter screen area of ​​the filter mechanism 16 through the external pipeline, which powerfully flushes the filter screen and flushes the blocked impurities back to the melt chamber or the special slag discharge port, thereby realizing the online cleaning and regeneration of the filter screen and ensuring that the device can operate continuously and stably for a long time.

[0024] like Figure 1-6 As shown, the filtration mechanism 16 includes a crossbar 161 symmetrically fixed to the outer end of the discharge fixing block 14, a support plate 162 fixed to the end of the crossbar 161, an opening and closing cylinder 163 fixed to the support plate 162, a connecting block 164 fixed to the end of the piston rod of the opening and closing cylinder 163, a lateral slot 165 opened on the side wall of the discharge fixing block 14, and a filter plate 166 fixed to the connecting block 164 and slidingly engaged with the lateral slot 165. The opening and closing cylinder 163 serves as a power actuator. Through the extension and retraction of its piston rod, it drives the connecting block 164 and the filter plate 166 fixed to the connecting block 164 to slide along the lateral slot 165 on the side wall of the discharge fixing block 14, thereby realizing the movement of the filter plate 166 out and in. The filter plate 166 is detachably provided with a coarse filter plate 1661, a medium-efficiency filter plate 1662 and a fine filter plate 1663 in sequence along the material flow direction, forming a three-stage filtration system. The molten plastic passes through the coarse filter, medium-efficiency filter and fine filter in sequence to gradually remove impurities of different particle sizes and improve the filtration effect. The top sides of each filter plate are fixed with a fixing seat 1664 with threaded holes.

[0025] like Figure 5 and 6 As shown, the top of the filter plate 166 has insertion slots 1665 corresponding to the coarse filter plate 1661, the medium-efficiency filter plate 1662, and the fine filter plate 1663. Each insertion slot 1665 has a through-hole groove 1666 at its top corresponding to the position of the fixing seat 1664. The fixing seat 1664 is internally threaded with a fixing screw 16641, the bottom end of which is screwed into the fitting groove 1666, thereby achieving a detachable and fixed installation of the coarse filter plate 1661, the medium-efficiency filter plate 1662, and the fine filter plate 1663 with the filter plate 166. The molten plastic passes through coarse filtration, medium-efficiency filtration, and fine filtration in sequence to gradually remove impurities of different particle sizes and improve the filtration effect. Each filter plate adopts a detachable installation design. Through the fixing seat 1664, the insertion groove 1665, and the adapter groove 1666, and the threaded connection of the fixing screw 16641, the filter plate is firmly fixed to the filter plate 166, which also facilitates the subsequent disassembly and replacement of the filter plate that is blocked or damaged. The middle of the filter plate 166 has a hollow structure to provide a flow channel for the molten plastic, ensuring that the material can smoothly enter the filter plates of each stage for filtration.

[0026] like Figure 1 , 3As shown in Figure 4, the high-pressure backwashing mechanism 17 includes a receiving box 171 located on the discharge port side of the extrusion granulation box 11, a high-pressure pump body 172 mounted on the top of the receiving box 171, a high-pressure nozzle 173 connected to the water outlet of the high-pressure pump body 172, and a reciprocating assembly 174 that drives the high-pressure nozzle 173 to move. The high-pressure nozzle 173 is mounted on the reciprocating assembly 174 and can perform multi-directional reciprocating motion under its drive. The water suction end of the high-pressure pump body 172 extends to the bottom of the receiving box 171. The receiving box 171 is used to store the cleaning fluid required for backwashing, providing a water source for high-pressure backwashing. The top of the receiving box 171 is provided with a liquid injection port with a cover 1711, which allows the staff to regularly replenish the cleaning fluid into the receiving box 171, ensuring the continuous and stable operation of the high-pressure backwashing mechanism 17. The cover 1711 is designed to provide a sealing and protective function, preventing external dust, impurities, etc. from falling into the receiving box 171. The high-pressure pump 172 draws and pressurizes the cleaning fluid from the container 171, causing a high-pressure water jet that is sprayed out from the high-pressure nozzle 173. The impact force of the high-pressure water jet backwashes the filter screen of the filter mechanism 16, removing impurities from the surface and inside of the filter screen. The reciprocating assembly 174 provides the high-pressure nozzle 173 with the power for multi-directional reciprocating motion, enabling the high-pressure nozzle 173 to fully cover all areas of the filter screen, avoiding cleaning dead zones and improving the backwashing effect. The suction end of the high-pressure pump 172 extends to the bottom of the container 171, which can fully draw out the cleaning fluid in the container 171 and reduce cleaning fluid residue.

[0027] like Figure 1 , 3 As shown in Figure 4, the container 171 has an L-shaped cross-section and is installed horizontally on the ground. The L-shaped structure allows for functional zoning. The high-pressure pump body 172 is located at the top of the vertical section of the container 171. A drying assembly 175 is also provided at the top of the vertical section of the container 171. The drying assembly 175 includes a fan 1751 corresponding to the filter plate 166 and an electric heating box 1752 fixedly mounted on the air outlet of the fan 1751 to heat the airflow. The drying assembly 175 works in conjunction with the high-pressure backwashing mechanism 17 to quickly dry the filter screen after it has been cleaned by the high-pressure nozzle 173, preventing the residual cleaning liquid on the filter screen surface from mixing with the subsequent molten plastic and affecting the granulation quality. The fan 1751 acts as an airflow generating element, and the generated room-temperature airflow enters the electric heating box 1752. The electric heating box 1752 heats the airflow to form a high-temperature airflow. The high-temperature airflow is blown through the outlet of the electric heating box 1752 towards the cleaned filter screen, accelerating the evaporation of moisture on the filter screen surface through heat transfer, thus achieving rapid drying.

[0028] like Figure 1 , 3 As shown in Figure 4, the reciprocating assembly 174 is disposed at the top of the horizontal end of the receiving box 171; the reciprocating assembly 174 includes a support block 1741 symmetrically fixed to the top of the horizontal end of the receiving box 171, a first limiting rod 1742 symmetrically fixed between two sets of support blocks 1741, a first reciprocating cylinder 1743 fixed to the outer wall of one set of support blocks 1741 and parallel to the first limiting rod 1742, a sleeve block 1744 slidably sleeved on the two sets of first limiting rods 1742, and a cylinder fixed to the sleeve block 1744. 4. A second reciprocating cylinder 1745 at the top, a second limiting rod 1746 fixed to both sides of the second reciprocating cylinder 1745 and parallel to it, an auxiliary block 1747 fixed to the top of the second limiting rod 1746, and a moving block 1748 slidably sleeved on the second limiting rod 1746; the piston rod of the first reciprocating cylinder 1743 moves through the support block 1741 and is fixedly connected to the sleeve block 1744; the piston rod of the second reciprocating cylinder 1745 is fixed to the bottom of the moving block 1748; The high-pressure nozzle 173 is fixedly mounted on the movable block 1748. The support block 1741 provides fixed support for the first limiting rod 1742 and the first reciprocating cylinder 1743. The first limiting rod 1742 guides and limits the sliding of the sleeve block 1744, preventing the sleeve block 1744 from deviating when sliding. When the first reciprocating cylinder 1743 is working, its piston rod extends and retracts, causing the sleeve block 1744 to reciprocate horizontally along the first limiting rod 1742, thereby driving the second reciprocating cylinder 1745 at the top of the sleeve block 1744 and related components to move horizontally synchronously. The second limiting rod 1746 is fixed by the auxiliary block 1747, which guides and limits the sliding of the moving block 1748. When the second reciprocating cylinder 1745 is working, its piston rod extends and retracts, driving the moving block 1748 to reciprocate along the second limiting rod 1746 in a direction perpendicular to the first limiting rod 1742. Since the high-pressure nozzle 173 is fixedly installed on the moving block 1748, the high-pressure nozzle 173 can reciprocate in multiple directions through the coordinated work of the first reciprocating cylinder 1743 and the second reciprocating cylinder 1745, ensuring comprehensive cleaning of the filter screen.

[0029] like Figure 1 , 3As shown in Figure 4, on the other side of the extrusion granulation box 11, which is removed from the filtration mechanism 16 for cleaning, a slag-blocking box 18 with a side opening is fixedly connected. When the filtration mechanism 16 is removed for cleaning, the slag-blocking box 18 is used to catch impurities (filter residue) falling from the filter screen, preventing the filter residue from scattering around the device or mixing into the cooling box 15. The bottom of the slag-blocking box 18 is designed with an inclined structure, which uses gravity to make the filter residue falling into the slag-blocking box 18 slide along the inclined surface to the bottom outlet. A slag collection box 181 is provided below the bottom outlet of the slag-blocking box 18. The slag collection box 181 is located on one side of the cooling box 15 and is used to collect the filter residue that slides out of the slag-blocking box 18, realizing centralized treatment of the filter residue and facilitating subsequent cleaning.

[0030] In practical use Step 1: Filter assembly and device startup First, based on the impurity content and purification requirements of the waste plastic to be processed, a suitable coarse filter plate 1661, a medium-efficiency filter plate 1662, and a fine filter plate 1663 are selected and assembled. These are then sequentially inserted into the corresponding insertion slots 1665 and fitting slots 1666 on the filter plate 166 and locked using fixing screws 16641, completing the assembly and pre-setting of the filtration mechanism 16. Subsequently, the entire device is started, and the extrusion drive assembly 12 drives the twin-screw material mixing assembly 13 to rotate within the extrusion granulation box 11, conveying, melting, and mixing the waste plastic raw materials into a high-temperature melt.

[0031] Step 2: Online Filtration and Production Molten plastic material flows out of the discharge port of the extrusion granulation box 11 under the thrust of the screw, and sequentially flows through the three-stage filter screen plate assembled in the filtration mechanism 16. Through this graded filtration process, impurities of different particle sizes are intercepted step by step, realizing online deep purification of the melt. The clean melt after filtration and purification is extruded into plastic strips through the extrusion head 167 at the outlet end of the discharge fixing block 14. The strips are guided by the guide rollers in the cooling box 15 and fall into the cooling box 15 for cooling and shaping. The cooled and shaped plastic strips are conveyed by the traction device, and after the surface moisture is blown off by the air drying component 151, they enter the pelletizer 19 to be cut into pellets of uniform size. The final product falls into the pellet collection box 191 for collection.

[0032] Step 3: Online Cleaning and Maintenance After the device has been running for a period of time, online cleaning needs to be performed: 1. Filter plate removal: Start the opening and closing cylinder 163, and its piston rod drives the connecting block 164 to drive the entire filter plate 166 to slide horizontally out along the side slot 165 on the side wall of the discharge fixing block 14 until it moves to the preset cleaning position and the filter plate 166 faces the slag box 18 below.

[0033] 2. High-pressure backwashing: Activate the high-pressure backwashing mechanism 17. Its reciprocating component 174 drives the high-pressure nozzle 173 to perform multi-axial reciprocating motion, performing high-pressure washing on the exposed filter screens at all levels without dead angles. The washed-off filter residue falls into the slag-blocking box 18 and slides along its inclined bottom surface into the slag collection box 181 for centralized collection.

[0034] 3. Hot air drying: After rinsing, start the fan 1751 and electric heating box 1752 of the air drying component 175 to blow the generated high-temperature airflow toward the filter screen to quickly evaporate the residual moisture and achieve thorough drying of the filter screen.

[0035] 4. Filter plate reset: After drying is complete, restart the opening and closing cylinder 163 to push the clean and dry filter plate 166 back to the working position along the side slot 165 and lock it. The device then resumes normal filtration and granulation operations.

[0036] Step 4: Replace the filter For routine maintenance or when the filter needs to be changed, simply loosen and remove the fixing screw 16641 to pull the old filter plate out of the insertion slot 1665. After replacing the filter plate, simply reinsert it and tighten it with the fixing screw 16641 to complete the replacement. The maintenance process is simple and quick.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A waste plastic recycling granulation device, comprising a supporting base plate (1), an extrusion granulation box (11) mounted on the supporting base plate (1), a cooling box (15) disposed at the discharge port of the extrusion granulation box (11), a drying component (151) mounted on the cooling box (15), a pelletizer (19) disposed at the outer end of the cooling box (15), a pellet collecting box (191) located below the discharge port of the pelletizer (19), an extrusion drive assembly (12) disposed outside the extrusion granulation box (11), and a twin-screw material mixing assembly (13) disposed inside the extrusion granulation box (11) and driven to rotate by the extrusion drive assembly (12), characterized in that: The discharge port end of the extrusion granulation box (11) is fixedly connected to a discharge fixing block (14), and an extrusion head (167) is installed at the outlet end of the discharge fixing block (14). A filter mechanism (16) is provided on the discharge fixing block (14); A high-pressure backwashing mechanism (17) is provided on one side of the extrusion granulation box (11).

2. The waste plastic recycling and granulation device according to claim 1, characterized in that: The filtration mechanism (16) includes a crossbar (161) symmetrically fixed to the outer end of the discharge fixing block (14), a support plate (162) fixed to the end of the crossbar (161), an opening and closing cylinder (163) fixed to the support plate (162), a connecting block (164) fixed to the end of the piston rod of the opening and closing cylinder (163), a lateral slot (165) opened on the side wall of the discharge fixing block (14), and a filter plate (166) fixed to the connecting block (164) and slidingly engaged with the lateral slot (165).

3. The waste plastic recycling and granulation device according to claim 2, characterized in that: The filter plate (166) is detachably provided with a coarse filter plate (1661), a medium-efficiency filter plate (1662) and a fine filter plate (1663) in sequence along the material flow direction, forming a three-stage filtration system; Each filter screen plate has a fixed base with threaded holes (1664) on both sides of its top end.

4. The waste plastic recycling and granulation device according to claim 3, characterized in that: The top of the filter plate (166) is provided with insertion slots (1665) corresponding to the coarse filter plate (1661), the medium efficiency filter plate (1662) and the fine filter plate (1663), and the top of each insertion slot (1665) is provided with an adapter slot (1666) corresponding to the position of the fixed seat (1664). The fixing seat (1664) is internally threaded with a fixing screw (16641), the bottom end of which is screwed into the adapter groove (1666), thereby realizing the detachable fixing installation of the coarse filter plate (1661), the medium efficiency filter plate (1662) and the fine filter plate (1663) with the filter plate (166); The filter plate (166) has a hollow structure in the middle.

5. The waste plastic recycling and granulation device according to claim 1, characterized in that: The high-pressure backwashing mechanism (17) includes a receiving box (171) disposed on the discharge port side of the extrusion granulation box (11), a high-pressure pump body (172) installed on the top of the receiving box (171), a high-pressure nozzle (173) connected to the water outlet end of the high-pressure pump body (172), and a reciprocating assembly (174) that drives the high-pressure nozzle (173) to move. The high-pressure nozzle (173) is mounted on the reciprocating assembly (174) and can perform multi-directional reciprocating motion under its drive; The suction end of the high-pressure pump body (172) extends to the bottom of the container (171).

6. The waste plastic recycling and granulation device according to claim 5, characterized in that: The container (171) has an L-shaped cross-section and is installed horizontally on the ground; The high-pressure pump body (172) is located at the top of the vertical section of the housing (171).

7. The waste plastic recycling and granulation device according to claim 6, characterized in that: The top of the vertical section of the container (171) is also provided with a drying assembly (175), which includes a fan (1751) corresponding to the filter plate (166) and an electric heating box (1752) fixedly covered at the air outlet of the fan (1751) and heating the airflow.

8. The waste plastic recycling and granulation device according to claim 6, characterized in that: The reciprocating assembly (174) is located at the top of the horizontal end of the receiving box (171); The reciprocating assembly (174) includes a support block (1741) symmetrically fixed to the top of the horizontal end of the receiving box (171), a first limiting rod (1742) symmetrically fixed between two sets of support blocks (1741), a first reciprocating cylinder (1743) fixed to the outer wall of one set of support blocks (1741) and parallel to the first limiting rod (1742), a sleeve block (1744) slidably sleeved on the two sets of first limiting rods (1742), a second reciprocating cylinder (1745) fixed to the top of the sleeve block (1744), a second limiting rod (1746) fixed to both sides of the second reciprocating cylinder (1745) and parallel to it, an auxiliary block (1747) fixed to the top of the second limiting rod (1746), and a moving block (1748) slidably sleeved on the second limiting rod (1746). The piston rod of the first reciprocating cylinder (1743) moves through the support block (1741) and is fixedly connected to the sleeve block (1744); The piston rod of the second reciprocating cylinder (1745) is fixed to the bottom of the moving block (1748); The high-pressure nozzle (173) is fixedly mounted on the movable block (1748).

9. The waste plastic recycling and granulation device according to claim 1, characterized in that: The side of the extrusion granulation box (11) is moved away from the other side of the cleaning relative to the filter mechanism (16), and a slag-blocking box (18) with a side opening is fixedly connected. The bottom of the slag-blocking box (18) is designed to be inclined.

10. A waste plastic recycling and granulation device according to claim 9, characterized in that: A slag collection box (181) is provided below the bottom outlet of the slag blocking box (18), and the slag collection box (181) is located on one side of the cooling box (15).

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