A waste plastic recycling extruder

Abstract

The utility model relates to extruder technical field, concretely discloses a kind of waste plastics recycling extruders, include: two parallelly arranged support plate;Extrusion barrel, extrusion barrel horizontal fixed connection in the upper end of two support plate, the right end is equipped with extrusion port;Die changing mechanism, setting in the side of extrusion port, for switching different wall thickness specifications die;Heating extrusion mechanism, setting on extrusion barrel, for heating, melting and conveying extrusion to material;Utilize the annular gap of different sizes formed by different diameter inner mold core and fixed inner diameter outer mold cover, to realize the quick adjustment of drip irrigation belt wall thickness.Worm gear worm gear electric push rod is accurately controlled moving disc displacement by the tension signal feedback of pressure sensor, make limiting cylinder and extrusion port realize reliable sealing by sealing gasket.The design is simple to operate, can change mould according to production demand, effectively solve the problem of traditional equipment flexibility deficiency, improve the adaptive capacity of production line.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, and specifically discloses a waste plastic recycling extruder. Background Technology

[0002] As a highly efficient and water-saving irrigation method in modern agriculture, drip irrigation technology is experiencing a surge in demand for its core component, drip irrigation tape. Drip irrigation tape is typically made of plastic, and its production process generally involves extruding molten plastic into a continuous tubular shape through a ring mold. After cooling and solidification, precise perforations are then created in the tube wall using laser or mechanical methods to form the drippers. Meanwhile, large quantities of waste plastics, such as discarded agricultural mulch film and packaging film, will cause serious "white pollution" if not effectively treated. Utilizing recycled waste plastics to produce drip irrigation tape not only reduces costs but also aligns with national policies on resource recycling and environmental protection, yielding significant economic and social benefits.

[0003] In existing plastic extruders, the die is the key component that determines the final shape and size of the product (such as the wall thickness of tubular drip irrigation tape). Currently, most extruders use a fixed die design, meaning that each extruder is typically equipped with only one set of dies of a specific specification. This fixed structure means that a single machine can only produce drip irrigation tape of a single wall thickness at a time. However, in actual agricultural production, different application scenarios have vastly different requirements for the wall thickness and durability of drip irrigation tape. For example, when planting field crops such as corn and cotton, low-cost, thin-walled disposable drip irrigation tape is usually used; while for irrigating perennial crops such as orchards and tea gardens, thicker-walled, high-strength, and aging-resistant drip irrigation tape is required to ensure a service life of several years. Existing extruders with fixed dies cannot flexibly adapt to these diverse needs, resulting in poor production flexibility and an inability to quickly adjust product specifications based on raw material conditions and market orders, thus limiting the improvement of the overall efficiency of recycling production lines.

[0004] Therefore, a waste plastic recycling extruder is needed to solve the above problems. Utility Model Content

[0005] This utility model proposes a waste plastic recycling extruder that can quickly and conveniently change the corresponding mold according to the actual required drip irrigation tape wall thickness. This design is simple to operate and effectively solves the problem of insufficient flexibility of existing equipment, thus better adapting to diverse production needs.

[0006] This utility model is implemented as follows: a waste plastic recycling extruder, comprising: Two parallel support plates; An extrusion cylinder is horizontally fixed to the upper ends of two support plates, and an extrusion port is provided at its right end. The mold changing mechanism is located on one side of the extrusion port and is used to switch between molds with different wall thicknesses. The heated extrusion mechanism, mounted on the extrusion cylinder, is used to heat, melt, and extrude the material. The mold changing mechanism includes: A rotating assembly includes a movable disk, the right end of which is rotatably connected to a rotating shaft via an embedded bearing, the right end of which is fixedly connected to the disk, and a worm gear electric actuator is installed on the outer wall of the right support plate. The output end of the worm gear electric actuator passes through the right support plate and is fixedly connected to the movable disk with a pressure sensor. Three mold units are evenly installed on the turntable along the circumference; each mold unit includes a docking cylinder that passes through the turntable and is fixedly connected to the turntable, an installation cover is fixedly connected to the outer wall of the docking cylinder, an outer mold sleeve is fixedly connected to the inside of the installation cover, and an inner mold core is provided inside the outer mold sleeve, the diameters of the three inner mold cores are different from each other.

[0007] As a preferred embodiment of the waste plastic recycling extruder of this utility model, the heating extrusion mechanism includes a spiral rod rotatably connected to the left end of the inner wall of the extrusion cylinder, a mounting frame fixedly connected to the left end of the extrusion cylinder, and a drive motor with its output end fixedly connected to the spiral rod mounted on the outer wall of the mounting frame. The extrusion cylinder has three interlayers distributed along its length between its inner and outer walls, and each of the three interlayers contains a cast aluminum heating plate.

[0008] As a preferred embodiment of the waste plastic recycling extruder of this utility model, a temperature sensor is provided on the right side of each of the three cast aluminum heating plates, three countersunk holes are opened on the outer wall of the extrusion cylinder, three sleeves are fixedly connected to the outer wall of the extrusion cylinder, the three temperature sensors are installed inside the corresponding sleeves, the probes of the three temperature sensors are respectively attached to the bottom end of the inner wall of the corresponding countersunk hole, and a temperature controller is installed on the outer wall of the left support plate.

[0009] As a preferred embodiment of the waste plastic recycling extruder of this utility model, three limiting cylinders are fixedly connected to the left end of the turntable. The axes of the three limiting cylinders are respectively aligned with the axes of the corresponding docking cylinders. The inner edges of the left ends of the three limiting cylinders are all chamfered, and one of the limiting cylinders is sleeved on the outer wall of the extrusion port.

[0010] As a preferred embodiment of the waste plastic recycling extruder of this utility model, an operation panel and controller are installed on the outer wall of the left support plate.

[0011] As a preferred embodiment of the waste plastic recycling extruder of this utility model, the left end of the moving disc is fixedly connected to two sliding rods that penetrate the right support plate and are slidably connected to the right support plate.

[0012] As a preferred embodiment of the waste plastic recycling extruder of this utility model, a sealing gasket is provided at the right end of the extrusion port, and the sealing gasket is made of pure PTFE material.

[0013] As a preferred embodiment of the waste plastic recycling extruder of this utility model, the left end of the outer mold sleeve is provided with a guide sleeve with a conical inner wall structure, the left end of the inner mold core is provided with a guide head with a conical outer wall structure, and multiple fixing rods are fixedly connected between the guide sleeve and the guide head.

[0014] The beneficial effects of this utility model are: Multiple mold units are switched by manually rotating a turntable. Different diameter inner mold cores and outer mold sleeves with fixed inner diameters create annular gaps of varying sizes, enabling rapid adjustment of the drip irrigation tape wall thickness. Once the desired mold unit is in the working position, the worm gear electric actuator precisely controls the displacement of the moving disc via a tension signal fed back from a pressure sensor, ensuring a reliable seal between the limiting cylinder and the extrusion port through a sealing gasket. This design is easy to operate and allows for quick mold changes according to production needs, effectively solving the problem of insufficient flexibility in traditional equipment and improving the adaptability of the production line. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a front sectional view of the waste plastic recycling extruder of this utility model; Figure 2 This is a structural diagram of the turntable of this utility model; Figure 3 This is a structural diagram of the flow guide sleeve of this utility model; Figure 4 This is a structural diagram of the limiting cylinder of this utility model; Figure 5 For the present utility model Figure 1 Enlarged view of point A in the middle; Figure 6 For the present utility model Figure 1 Enlarged view of section B in the middle.

[0017] The markings in the diagram are: 1. Support plate; 2. Extrusion cylinder; 3. Extrusion port; 4. Screw rod; 5. Mounting bracket; 6. Drive motor; 7. Sealing gasket; 8. Worm gear electric actuator; 9. Pressure sensor; 10. Moving disk; 11. Rotating shaft; 12. Turntable; 13. Connecting cylinder; 14. Mounting cover; 15. Outer mold sleeve; 16. Inner mold core; 17. Guide head; 18. Guide sleeve; 19. Fixing rod; 20. Limiting cylinder; 21. Cast aluminum heating plate; 22. Countersunk hole; 23. Tube sleeve; 24. Temperature sensor; 25. Operation panel; 26. Controller; 27. Temperature controller. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0019] Please see Figure 1-6 A waste plastic recycling extruder, comprising: Two parallel support plates 1; Extrusion cylinder 2 is horizontally fixed to the upper end of two support plates 1, and its right end is provided with an extrusion port 3. The mold changing mechanism is located on one side of the extrusion port 3 and is used to switch molds with different wall thicknesses. The heated extrusion mechanism is mounted on the extrusion cylinder 2 and is used to heat, melt, and extrude the material. The mold changing mechanism includes: The rotating assembly includes a movable disk 10. The right end of the movable disk 10 is rotatably connected to a rotating shaft 11 via an embedded bearing. The right end of the rotating shaft 11 is fixedly connected to a turntable 12. A worm gear electric actuator 8 is installed on the outer wall of the right support plate 1. The output end of the worm gear electric actuator 8 passes through the right support plate 1 and is fixedly connected to the movable disk 10 with a pressure sensor 9. Three mold units are evenly installed on the turntable 12 along the circumference. Each mold unit includes a docking cylinder 13 that passes through the turntable 12 and is fixedly connected to the turntable 12. An installation cover 14 is fixedly connected to the outer wall of the docking cylinder 13. An outer mold sleeve 15 is fixedly connected inside the installation cover 14. An inner mold core 16 is provided inside the outer mold sleeve 15. The diameters of the three inner mold cores 16 are different from each other.

[0020] In this embodiment: When a drip irrigation tape with a specific wall thickness needs to be produced, the operator first manually rotates the turntable 12, causing the three mold units to rotate synchronously. The inner diameter of the outer mold sleeve 15 inside the mounting cover 14 of each mold unit is the same, while the diameter of the inner mold core 16 is different for each unit. The annular gap between the outer mold sleeve 15 and the inner mold core 16 determines the wall thickness of the final product. By rotating the turntable 12, the required mold unit can be rotated to the upper working position, aligning the corresponding limiting cylinder 20 with the extrusion port 3.

[0021] Subsequently, the worm gear electric actuator 8 is activated, pulling the moving disk 10 slowly to the left. This, in turn, moves the turntable 12 and the three mold units to the left simultaneously, causing the corresponding limiting cylinder 20 to engage with the outer wall of the extrusion port 3. This ensures that the end face of the extrusion port 3 forms a tight contact with the sealing gasket 7, effectively preventing leakage of molten plastic in subsequent operations. During this process, the pressure sensor 9, fixed on the moving disk 10, monitors the tension signal in real time and transmits it to the controller 26. When the tension reaches a preset threshold, the controller 26 immediately stops the operation of the worm gear electric actuator 8, ensuring that the sealing gasket 7 and the extrusion port 3 are in the optimal compression state, guaranteeing both sealing performance and avoiding quality problems caused by overpressure or insufficient pressure.

[0022] During operation, the material is heated, melted and conveyed to the extrusion port 3 through the heating extrusion mechanism. After passing through the extrusion port 3, the melt enters the docking cylinder 13 and is finally extruded through the annular gap between the outer mold sleeve 15 and the inner mold core 16 to form a tubular product with a predetermined wall thickness.

[0023] In summary, the design allows for quick and convenient replacement of the appropriate mold based on the required drip tape wall thickness. This simple design effectively solves the problem of insufficient flexibility in existing equipment, thus better adapting to diverse production needs.

[0024] As a technical optimization of this utility model, the heating extrusion mechanism includes a spiral rod 4 rotatably connected to the left end of the inner wall of the extrusion cylinder 2, a mounting frame 5 fixedly connected to the left end of the extrusion cylinder 2, and a drive motor 6 with its output end fixedly connected to the spiral rod 4 installed on the outer wall of the mounting frame 5. Three interlayers are provided between the inner and outer walls of the extrusion cylinder 2, distributed along the length of the extrusion cylinder 2, and each of the three interlayers is provided with a cast aluminum heating plate 21.

[0025] In this embodiment: the drive motor 6 drives the screw 4 to rotate continuously inside the extrusion cylinder 2. The waste plastic raw material fed in through the feeding port on the upper side of the extrusion cylinder 2 is gradually melted and plasticized under the shearing and conveying action of the screw 4 and the segmented heating action of the three cast aluminum heating plates 21. The cast aluminum heating plates 21, which are set in multiple layers inside the wall of the extrusion cylinder 2, heat the material in segments, forming a uniform plastic melt that is continuously pushed towards the extrusion port 3.

[0026] As a technical optimization of this utility model, a temperature sensor 24 is provided on the right side of each of the three cast aluminum heating plates 21, three countersunk holes 22 are opened on the outer wall of the extrusion cylinder 2, three sleeves 23 are fixedly connected to the outer wall of the extrusion cylinder 2, and the three temperature sensors 24 are installed inside the corresponding sleeves 23. The probes of the three temperature sensors 24 are respectively attached to the bottom end of the inner wall of the corresponding countersunk hole 22, and a temperature controller 27 is installed on the outer wall of the left support plate 1.

[0027] In this embodiment, three temperature sensors 24 indirectly monitor the barrel wall temperature of different sections of the extrusion cylinder 2 through corresponding countersunk holes 22, and transmit the detection signals to the temperature controller 27 in real time. The temperature controller 27 compares the set temperature with the measured temperature and adjusts the heating power of the cast aluminum heating plate 21 in a closed loop using a PID algorithm to ensure that the plastic raw material is always melted and plasticized within the optimal process temperature range.

[0028] As a technical optimization of this utility model, three limiting cylinders 20 are fixedly connected to the left end of the turntable 12. The axes of the three limiting cylinders 20 are respectively aligned with the axes of the corresponding docking cylinders 13. The inner edge of the left end of the three limiting cylinders 20 is chamfered. One of the limiting cylinders 20 is sleeved on the outer wall of the extrusion port 3.

[0029] In this embodiment: when the mold unit rotates to the working position via the turntable 12, the limiting cylinder 20 corresponding to the mold unit moves together with the turntable 12. During the process of the worm gear electric actuator 8 pushing the moving disk 10 to move towards the extrusion port 3, the limiting cylinder 20 is first sleeved on the outer wall of the extrusion port 3, and the chamfer plays a guiding role, making it convenient to sleeve the limiting cylinder 20.

[0030] As a technical optimization of this utility model, an operation panel 25 and a controller 26 are installed on the outer wall of the left support plate 1.

[0031] In this embodiment: the operator inputs control commands through the operation panel 25, and the controller 26 receives the commands and controls the drive motor 6, the worm gear electric actuator 8, and the cast aluminum heating plate 21 to work. Simultaneously, the controller 26 receives detection signals from the pressure sensor 9 and the temperature sensor 24 in real time.

[0032] As a technical optimization of this utility model, the left end of the movable disk 10 is fixedly connected to two sliding rods that pass through the right support plate 1 and are slidably connected to the right support plate 1.

[0033] In this embodiment, the stability of the moving disk 10 is improved by setting two sliding rods.

[0034] As a technical optimization of this utility model, a sealing gasket 7 is provided at the right end of the extrusion port 3, and the sealing gasket 7 is made of pure PTFE material.

[0035] In this embodiment: the pure PTFE sealing gasket 7, which is set at the right end of the extrusion port 3, is tightly pressed between the end face of the extrusion port 3 and the end face of the docking cylinder 13 after the mold unit is docked. Utilizing the high temperature resistance, chemical stability and elasticity of polytetrafluoroethylene, a reliable static seal is formed in the high temperature and high pressure plastic melt environment, effectively preventing melt leakage.

[0036] As a technical optimization of this utility model, the left end of the outer mold sleeve 15 is provided with a guide sleeve 18 with a conical inner wall, the left end of the inner mold core 16 is provided with a guide head 17 with a conical outer wall, and a plurality of fixing rods 19 are fixedly connected between the guide sleeve 18 and the guide head 17.

[0037] In this embodiment: inside the mold, the guide head 17 and the guide sleeve 18 form a guide channel through their conical surfaces, so that the melt passes evenly through the annular gap formed by the inner mold core 16 and the outer mold sleeve 15.

[0038] The working principle and usage process of this utility model are as follows: When it is necessary to produce drip irrigation tape with a specific wall thickness, the operator first manually rotates the turntable 12, causing the three mold units to rotate synchronously. The inner diameter of the outer mold sleeve 15 inside the mounting cover 14 of each mold unit is the same, while the diameter of the inner mold core 16 is different for each. The annular gap between the outer mold sleeve 15 and the inner mold core 16 determines the wall thickness of the final product. By rotating the turntable 12, the required mold unit can be rotated to the upper working position, so that the corresponding limiting cylinder 20 of the unit is aligned with the extrusion port 3.

[0039] Subsequently, the worm gear electric actuator 8 is activated, pulling the moving disk 10 slowly to the left. This, in turn, moves the turntable 12 and the three mold units to the left simultaneously, causing the corresponding limiting cylinder 20 to engage with the outer wall of the extrusion port 3. This ensures that the end face of the extrusion port 3 forms a tight contact with the sealing gasket 7, effectively preventing leakage of molten plastic in subsequent operations. During this process, the pressure sensor 9, fixed on the moving disk 10, monitors the tension signal in real time and transmits it to the controller 26. When the tension reaches a preset threshold, the controller 26 immediately stops the operation of the worm gear electric actuator 8, ensuring that the sealing gasket 7 and the extrusion port 3 are in the optimal compression state, guaranteeing both sealing performance and avoiding quality problems caused by overpressure or insufficient pressure.

[0040] During operation, the drive motor 6 drives the screw rod 4 to rotate continuously inside the extrusion cylinder 2. Waste plastic raw materials fed in through the feeding port on the upper side of the extrusion cylinder 2 are gradually melted and plasticized under the shearing and conveying action of the screw rod 4 and the segmented heating action of the cast aluminum heating plate 21, forming a uniform plastic melt that is continuously pushed towards the extrusion port 3. After passing through the extrusion port 3, the melt enters the docking cylinder 13 and is finally extruded through the annular gap between the outer mold sleeve 15 and the inner mold core 16 to form a tubular product with a predetermined wall thickness.

[0041] Throughout the plasticizing and extrusion process, three temperature sensors 24 indirectly monitor the barrel wall temperature in different sections through corresponding countersunk holes 22, and transmit the detection signals to the temperature controller 27 in real time. The temperature controller 27 compares the set temperature with the measured temperature and performs closed-loop adjustment of the heating power of the cast aluminum heating plate 21 to ensure that the plastic raw material is always melted and plasticized within the optimal process temperature range.

[0042] In summary, the design allows for quick and convenient replacement of the appropriate mold based on the required drip tape wall thickness. This simple design effectively solves the problem of insufficient flexibility in existing equipment, thus better adapting to diverse production needs.

[0043] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0044] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A waste plastic recycling extruder, characterized in that, include: Two parallel support plates (1); The extrusion cylinder (2) is horizontally fixed to the upper end of two support plates (1), and its right end is provided with an extrusion port (3). The mold changing mechanism is located on one side of the extrusion port (3) and is used to switch molds with different wall thicknesses. A heated extrusion mechanism is installed on the extrusion cylinder (2) and is used to heat, melt and extrude the material; The mold changing mechanism includes: The rotating assembly includes a movable disk (10), the right end of which is rotatably connected to a rotating shaft (11) via an embedded bearing, the right end of which is fixedly connected to a turntable (12), and a worm gear electric actuator (8) is installed on the outer wall of the right support plate (1). The output end of the worm gear electric actuator (8) passes through the right support plate (1) and is fixedly connected to a pressure sensor (9) between it and the movable disk (10). Three mold units are evenly installed on the turntable (12) along the circumference; each mold unit includes a docking cylinder (13) that passes through the turntable (12) and is fixedly connected to the turntable (12). An installation cover (14) is fixedly connected to the outer wall of the docking cylinder (13). An outer mold sleeve (15) is fixedly connected inside the installation cover (14). An inner mold core (16) is provided inside the outer mold sleeve (15). The diameters of the three inner mold cores (16) are different from each other.

2. The waste plastic recycling extruder according to claim 1, characterized in that: The heating extrusion mechanism includes a screw rod (4) rotatably connected to the left end of the inner wall of the extrusion cylinder (2), a mounting frame (5) is fixedly connected to the left end of the extrusion cylinder (2), and a drive motor (6) with its output end fixedly connected to the screw rod (4) is installed on the outer wall of the mounting frame (5). The extrusion cylinder (2) has three interlayers distributed along the length of the extrusion cylinder (2) between its inner and outer walls, and each of the three interlayers is provided with a cast aluminum heating plate (21).

3. The waste plastic recycling extruder according to claim 2, characterized in that: Temperature sensors (24) are provided on the right side of each of the three cast aluminum heating plates (21). Three countersunk holes (22) are opened on the outer wall of the extrusion cylinder (2). Three sleeves (23) are fixedly connected to the outer wall of the extrusion cylinder (2). The three temperature sensors (24) are installed inside the corresponding sleeves (23). The probes of the three temperature sensors (24) are respectively attached to the bottom of the inner wall of the corresponding countersunk hole (22). A temperature controller (27) is installed on the outer wall of the left support plate (1).

4. The waste plastic recycling extruder according to claim 1, characterized in that: The left end of the turntable (12) is fixedly connected to three limiting cylinders (20). The axes of the three limiting cylinders (20) are aligned with the axes of the corresponding docking cylinders (13). The inner edge of the left end of the three limiting cylinders (20) is chamfered. One of the limiting cylinders (20) is sleeved on the outer wall of the extrusion port (3).

5. The waste plastic recycling extruder according to claim 1, characterized in that: An operation panel (25) and a controller (26) are installed on the outer wall of the left support plate (1).

6. The waste plastic recycling extruder according to claim 1, characterized in that: The left end of the movable disk (10) is fixedly connected to two sliding rods that pass through the right support plate (1) and are slidably connected to the right support plate (1).

7. The waste plastic recycling extruder according to claim 1, characterized in that: The right end of the extrusion port (3) is provided with a sealing gasket (7), which is made of pure PTFE material.

8. The waste plastic recycling extruder according to claim 1, characterized in that: The left end of the outer mold sleeve (15) is provided with a flow guide sleeve (18) with a conical inner wall, and the left end of the inner mold core (16) is provided with a flow guide head (17) with a conical outer wall. Multiple fixing rods (19) are fixedly connected between the flow guide sleeve (18) and the flow guide head (17).

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