Plastic extruder

Abstract

The utility model relates to the technical field of plastic recycling, in particular to a plastic extruder. Comprising a heating material box, a vibration motor, a driving device and two extrusion devices, a rack is arranged at the bottom end of the heating material box; the extrusion device comprises an extrusion cylinder, a piston and a piston rod; the driving device comprises a reciprocating driving assembly and a transmission assembly; and the vibration motor is mounted on the heating material box. According to the utility model, through a piston discharging mode, the discharging of the equipment is more thorough, the material can be ensured to fill the cavity during material suction, bubbles in the material can be reduced, and the discharging uniformity is ensured; and in addition, the piston can scrape away excess materials on the inner wall of the cylinder main body in the material pushing process, and therefore residues in the cylinder main body are reduced.

Description

Technical Field

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

[0002] In plastic extrusion molding equipment, the plastic extruder is usually called the main machine, while the downstream equipment that matches it, the plastic extrusion molding machine, is called the auxiliary machine. The plastic extruder can be matched with various plastic molding auxiliary machines such as pipes, films, rods, monofilaments, flat filaments, strapping, extruded mesh, sheets, profiles, granulation, and cable sheathing to form various plastic extrusion molding production lines to produce various plastic products.

[0003] Patent CN217073278U discloses a feeding device for a plastic extruder, including a base. The top of the base has symmetrically arranged supports. A discharge rod is rotatably embedded in the upper part of the supports. A support rod is symmetrically fixed to the top of the base. A fixing plate is fixed to the top of the support rod. A hopper is fixedly embedded within the fixing plate. The bottom end of the hopper abuts against the top end of the discharge rod. Multiple cavities (Cavities I) are arranged in a ring array within the discharge rod. Cavities I and the hopper are located on the same vertical plane. Multiple feed inlets matching the hopper are arranged in a ring array through the discharge rod. Each feed inlet communicates with the internal space of an adjacent cavity I. Multiple cavities (Cavities II) are arranged in a ring array on the side of the discharge rod away from the hopper.

[0004] The aforementioned patents represent the most common plastic extrusion method, but they still have the following technical defects: when the working process begins, the cavity cannot be filled quickly, which can cause air in the cavity to easily mix into the molten material, thus affecting the extrusion effect; and the screw has a large surface area and a complex structure, making it easy for a large amount of residual material to remain on its surface, which is also inconvenient to clean. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a plastic extruder.

[0006] The technical solution of this utility model is a plastic extruder, comprising:

[0007] A heated material box, with a frame installed at the bottom;

[0008] Two extrusion devices are provided. Each extrusion device includes an extrusion cylinder, a piston, and a piston rod. The extrusion cylinder is mounted on a frame. A second one-way valve is installed at the discharge end of the extrusion cylinder. A discharge pipe is connected between the extrusion cylinder and the heating tank. A first one-way valve is installed on the discharge pipe. The piston is movably located inside the extrusion cylinder. The piston rod movably passes through the inside and outside of the extrusion cylinder and is connected to the piston.

[0009] The drive unit includes a reciprocating drive assembly and a transmission assembly; the transmission assembly includes a gear and two racks, the two racks are respectively connected to the outer ends of the piston rods on both sides, the gear is rotatably mounted on the frame and meshes with the two racks; the reciprocating drive assembly is used to drive the racks to move back and forth reciprocally.

[0010] Vibration motor, which is installed on the heating tank.

[0011] Preferably, a feed hopper is connected to the heating material box, and a cover plate is rotatably installed on the feed hopper; a heating baffle is horizontally arranged on the inner side of the heating material box; electric heating wires are installed inside the heating material box and the heating baffle; a through hole is opened on the heating baffle, and a discharge baffle is arranged below the through hole, which movably passes through the side wall of the heating material box.

[0012] Preferably, a stirring device is installed on the heating material box. The stirring device includes a drive motor, a stirring shaft, and multiple stirring blades. The stirring shaft is rotatably installed inside the heating material box and moves through the heating partition. The drive motor is installed outside the heating material box and its output shaft is connected to the stirring shaft. The multiple stirring blades are all installed on the stirring shaft.

[0013] Preferably, a rectangular frame is provided below the discharge baffle, the rectangular frame is connected to the inner wall of the heating box, and a heating mesh is installed on the rectangular frame. The heating mesh is composed of a grid structure made up of multiple electric heating wires.

[0014] Preferably, the reciprocating drive assembly includes a servo motor, a bidirectional lead screw, a crescent pin, and a connecting slider. The servo motor is mounted on the frame, the bidirectional lead screw is connected to the output shaft of the servo motor, the crescent pin is mounted on the bidirectional lead screw, and the connecting slider is connected to a rack on one side. The crescent pin is rotatably mounted on the connecting slider.

[0015] Preferably, the extrusion cylinder includes a cylindrical body, a sealing plate, and an extrusion tube. The extrusion end of the cylindrical body is open. The sealing plate is located at the opening of the extrusion end of the cylindrical body and has a detachable connection between the sealing plate and the frame. The extrusion tube is located on the sealing plate and communicates with the inner side of the cylindrical body.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] By using a piston discharge method, the equipment discharges material more thoroughly, ensuring that the chamber is filled with material during suction, reducing air bubbles in the material, and ensuring uniform discharge.

[0018] During the feeding process, the piston can scrape off the excess material on the inner wall of the cylinder body, thereby reducing the residue inside the cylinder body. Compared with the common screw extrusion method in the prior art, it can reduce material residue and has the advantage of being easy to clean. Attached Figure Description

[0019] Figure 1 and Figure 2 All of these are schematic diagrams of the structure of this utility model.

[0020] Figure 3 This is a cross-sectional view of the heating tank in this utility model.

[0021] Figure 4 This is a cross-sectional view of the cylindrical body in this utility model.

[0022] Reference numerals: 1. Heating hopper; 2. Frame; 3. Cylindrical body; 4. Servo motor; 5. Bidirectional lead screw; 6. Rack; 7. Gear; 8. Crescent pin; 9. Connecting slider; 10. Feed hopper; 11. Cover plate; 12. Drive motor; 13. Stirring shaft; 14. Heating baffle; 141. Through hole; 15. Discharge baffle; 16. Rectangular frame; 17. Heating mesh; 18. Discharge pipe; 19. First check valve; 20. Vibration motor; 21. Sealing plate; 22. Extrusion pipe; 23. Second check valve; 24. Piston; 25. Piston rod; 26. Stirring blade. Detailed Implementation

[0023] Example 1

[0024] like Figures 1-4 As shown, the plastic extruder proposed in this embodiment includes a heated material box 1, a vibrating motor 20, a drive device, and two extrusion devices.

[0025] A frame 2 is provided at the bottom of the heating tank 1. In order to isolate the heat inside the heating tank 1, heat insulation material is coated on the outer surface of the heating tank 1.

[0026] The extrusion device includes an extrusion cylinder, a piston 24, and a piston rod 25. The extrusion cylinder is mounted on a frame 2 and includes a cylindrical body 3, a sealing plate 21, and an extrusion tube 22. The extrusion end of the cylindrical body 3 is open, and the sealing plate 21 is located at the opening of the extrusion end of the cylindrical body 3. It should be noted that piston rings are installed on both the sealing plate 21 and the piston 24, which serve a sealing function. The sealing plate 21 is detachably connected to the frame 2 using bolts, screws, or other fasteners. After removing the sealing plate 21 and moving the piston 24 to the extrusion end position of the cylindrical body 3, the sealing plate can be... The residual material on piston 21 and piston 24 is cleaned. Extrusion tube 22 is set on sealing plate 21 and communicates with the inner side of cylindrical body 3. It should be added that several extrusion holes are opened on extrusion tube 22. A second one-way valve 23 is installed at the discharge end of extrusion cylinder. Discharge pipe 18 is connected between extrusion cylinder and heating material box 1. Discharge pipe 18 is set on the side adjacent to the discharge end of cylindrical body 3. A first one-way valve 19 is installed on discharge pipe 18. Piston 24 is movably set inside extrusion cylinder. Piston rod 25 movably passes through the inner and outer sides of extrusion cylinder and is connected to piston 24. A through hole is opened on the side of cylindrical body 3 away from its extrusion end to allow the gas inside cylindrical body 3 to be discharged normally.

[0027] The drive unit includes a reciprocating drive assembly and a transmission assembly; the transmission assembly includes a gear 7 and two racks 6, the two racks 6 are respectively connected to the outer ends of the piston rods 25 on both sides, the gear 7 is rotatably mounted on the frame 2 and meshes with the two racks 6; the reciprocating drive assembly is used to drive the racks 6 to move back and forth, the reciprocating drive assembly includes a servo motor 4, a bidirectional lead screw 5, a crescent pin 8 and a connecting slider 9, wherein the servo motor 4 is mounted on the frame 2, the bidirectional lead screw 5 is connected to the output shaft of the servo motor 4, the crescent pin 8 is mounted on the bidirectional lead screw 5, the connecting slider 9 is connected to one side of the rack 6, and the crescent pin 8 is rotatably mounted on the connecting slider 9; the vibration motor 20 is mounted on the heating box 1.

[0028] It should be added that electric heating wires are installed on both the extrusion tube 22 and the discharge tube 18. The electric heating heats the discharge tube 18 and the extrusion tube 22, which can melt the material condensed inside and prevent blockage.

[0029] Specifically, the molten material inside the heating tank 1 flows into the interior of the cylindrical body 3 through the discharge pipe 18. The first one-way valve 19 only allows material to flow out in one direction. At this time, the reciprocating drive assembly drives one side rack 6 to move back and forth. With the cooperation of the gear 7, the two racks 6 move in opposite directions, and the two racks 6 drive the pistons 24 on both sides to move respectively. During the process of the crescent pin 8 moving from the left end to the right end, the material inside the first cylindrical body 3 is squeezed out. The second one-way valve 23 only allows material to be squeezed out, and the second cylindrical body 3 begins to suck up material (the first and second are only used to distinguish different cylindrical bodies 3 for ease of description). When the crescent pin 8 moves to the right end position... Then it begins to move back, that is, after all the material inside the first cylindrical body 3 is extruded, it begins to suck up material, while the material inside the second cylindrical body 3 is filled and begins to discharge material. This process is repeated to achieve continuous material discharge. At the same time as the molten material is extruded, the vibration motor 20 is started to work. The vibration generated by the vibration motor 20 can reduce air bubbles in the material. In summary, the piston discharge method makes the discharge of the equipment more thorough and can also reduce air bubbles in the material, ensuring the uniformity of the discharge. During the pushing process, the piston 24 can scrape the residual material on the inner wall of the cylindrical body 3, thereby reducing the residue inside the cylindrical body 3. Compared with the discharge method of screw extrusion commonly used in the prior art, it can reduce material residue and has the advantage of being easy to clean.

[0030] Example 2

[0031] like Figures 1-3 As shown, this embodiment of the plastic extruder, compared to Embodiment 1, has an additional feature: a feed hopper 10 is connected to the heating material box 1, and a cover plate 11 is rotatably mounted on the feed hopper 10; a heating baffle 14 is horizontally arranged on the inner side of the heating material box 1. In this technical solution, the heating baffle 14 divides the interior of the heating material box 1 into an upper chamber and a lower chamber. The lower chamber stores fully melted material that is currently in use. The upper chamber is used to heat and melt primary solid raw materials. Once the material in the upper chamber is completely melted, it is discharged into the lower chamber for use, and then further heated into the upper chamber. The heating tank 1 and the heating partition 14 are equipped with electric heating wires to heat the materials, ensuring that the solid raw materials are fully melted. The heating partition 14 has a through hole 141, and a discharge baffle 15 is located below the through hole 141. The discharge baffle 15 extends through the side wall of the heating tank 1, and the through hole 141 can be opened and closed by pulling the discharge baffle 15. Furthermore, a transparent observation window is installed on the heating tank 1 to facilitate observation of its interior.

[0032] A stirring device is installed on the heating material tank 1. The stirring device includes a drive motor 12, a stirring shaft 13, and multiple stirring blades 26. The stirring shaft 13 is rotatably installed inside the heating material tank 1 and moves through the heating partition 14. The drive motor 12 is installed outside the heating material tank 1 and its output shaft is connected to the stirring shaft 13. The multiple stirring blades 26 are all installed on the stirring shaft 13. The stirring device can improve the uniformity of heating of the raw materials, increase the melting speed of the raw materials, and reduce air bubbles in the molten material.

[0033] A rectangular frame 16 is provided below the discharge baffle 15. The rectangular frame 16 is connected to the inner wall of the heating material box 1. A heating mesh 17 is installed on the rectangular frame 16. The heating mesh 17 is a grid structure composed of multiple electric heating wires. The heating mesh 17 can be used to intercept raw materials that have not been completely melted. The raw materials can be further heated by electric heating until they melt.

[0034] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A plastic extruder, characterized in that, include: Heating tank (1), with a frame (2) installed at the bottom of the heating tank (1); Two extrusion devices are provided. Each extrusion device includes an extrusion cylinder, a piston (24), and a piston rod (25). The extrusion cylinder is mounted on the frame (2). A second one-way valve (23) is installed at the discharge end of the extrusion cylinder. A discharge pipe (18) is connected between the extrusion cylinder and the heating box (1). A first one-way valve (19) is installed on the discharge pipe (18). The piston (24) is movably located inside the extrusion cylinder. The piston rod (25) movably passes through the inside and outside of the extrusion cylinder and is connected to the piston (24). The drive unit includes a reciprocating drive assembly and a transmission assembly; the transmission assembly includes a gear (7) and two racks (6), the two racks (6) are respectively connected to the outer ends of the piston rods (25) on both sides, the gear (7) is rotatably mounted on the frame (2) and meshes with the two racks (6); the reciprocating drive assembly is used to drive the racks (6) to move back and forth. Vibration motor (20) is installed on heating material box (1).

2. The plastic extruder according to claim 1, characterized in that, A feeding hopper (10) is connected to the heating material box (1), and a cover plate (11) is rotatably installed on the feeding hopper (10); a heating baffle (14) is horizontally arranged on the inner side of the heating material box (1); electric heating wires are installed inside the heating material box (1) and the heating baffle (14); a through hole (141) is opened on the heating baffle (14), and a discharge baffle (15) is arranged below the through hole (141), and the discharge baffle (15) moves through the side wall of the heating material box (1).

3. A plastic extruder according to claim 2, characterized in that, A stirring device is installed on the heating material box (1). The stirring device includes a drive motor (12), a stirring shaft (13), and multiple stirring blades (26). The stirring shaft (13) is rotatably installed on the inner side of the heating material box (1) and moves through the heating partition (14). The drive motor (12) is installed on the outer side of the heating material box (1) and its output shaft is connected to the stirring shaft (13). Multiple stirring blades (26) are all installed on the stirring shaft (13).

4. A plastic extruder according to claim 2, characterized in that, A rectangular frame (16) is provided below the discharge baffle (15). The rectangular frame (16) is connected to the inner wall of the heating box (1). A heating mesh (17) is installed on the rectangular frame (16). The heating mesh (17) is composed of multiple electric heating wires forming a grid structure.

5. A plastic extruder according to claim 1, characterized in that, The reciprocating drive assembly includes a servo motor (4), a bidirectional lead screw (5), a crescent pin (8), and a connecting slider (9). The servo motor (4) is mounted on the frame (2), the bidirectional lead screw (5) is connected to the output shaft of the servo motor (4), the crescent pin (8) is mounted on the bidirectional lead screw (5), and the connecting slider (9) is connected to a rack (6) on one side. The crescent pin (8) is rotatably mounted on the connecting slider (9).

6. A plastic extruder according to claim 1, characterized in that, The extrusion cylinder includes a cylindrical body (3), a sealing plate (21), and an extrusion tube (22). The extrusion end of the cylindrical body (3) is open. The sealing plate (21) is located at the opening of the extrusion end of the cylindrical body (3), and the sealing plate (21) and the frame (2) have a detachable connection structure. The extrusion tube (22) is located on the sealing plate (21) and communicates with the inner side of the cylindrical body (3).

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