Polyethylene plastic rim charge recycling extruder

Abstract

The invention relates to the technical field of plastic extrusion production, in particular to a polyethylene plastic rim charge recycling extruder which comprises a base, a gear motor, an extrusion screw, a supporting frame and a heating cylinder and further comprises a feeding frame, a feeding hopper, a smashing assembly, a driving motor and an extrusion assembly. The smashing assembly is arranged on the inner side of the feeding frame and the inner side of the feeding hopper, the driving motor is installed on the outer side of the feeding hopper, and the driving motor is in transmission connection with the smashing assembly. According to the invention, the fed polyethylene film rim charge is sheared and crushed, the size of the polyethylene film rim charge is reduced, and then the polyethylene film rim charge is continuously pressed, so that the problem that the whole extruder needs to be improved in a large scale due to the existence of a large amount of air in the mutually stacked polyethylene film rim charge during secondary production of the recycled polyethylene film rim charge by the extruder is solved; the extrusion production cost is increased, and a large amount of improvement funds need to be consumed.

Description

Technical Field

[0001] The invention relates to the technical field of plastic extrusion production, in particular to a polyethylene plastic edge material recovery extruder. Background Art

[0002] Polyethylene (PE) is a thermoplastic made from ethylene monomers through polymerization. Polyethylene (PE) has become the cornerstone of the plastics industry due to its low cost, easy processing and chemical resistance, especially film products occupy the largest market share.

[0003] In the production process of polyethylene film, since the polyethylene film after cast film needs to be trimmed and slit, and a certain proportion of edge material will be produced at the head and tail of the roll film, in order to reduce the production cost of polyethylene plastic, it is necessary to recycle the uncontaminated polyethylene film edge material produced after slitting and rolling, and send it to the extruder for secondary production.

[0004] When the recycled polyethylene film scraps were fed into the feed hopper of the extruder for secondary production, it was found that the polyethylene film scraps had different shapes due to trimming and slitting, and they entered the extruder through the feed hopper in a stacked state. Compared with traditional granular polyethylene raw materials, there is a lot of air inside the stacked polyethylene film scraps. When the extruder is in production, the air that is not discharged from the polyethylene film scraps will enter the extruder. Although the exhaust system of the extruder can exhaust a certain amount of air, since the polyethylene film scraps contain a lot of air, in order to ensure the exhaust effect and the extrusion quality of polyethylene plastics, in this case, the extruder needs to expand the exhaust section cavity volume and extend the material residence time. This will cause the production time of polyethylene plastics to be extended, resulting in increased energy loss, and the equipment modification range is large, requiring more funds.

[0005] For this reason, a polyethylene plastic edge material recovery extruder is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a polyethylene plastic scrap recycling extruder, which can shear and crush the polyethylene film scraps, reduce their size and then continuously pressurize them, thereby solving the problem that when the extruder recycles the polyethylene film scraps for secondary production, a large amount of air exists inside the stacked polyethylene film scraps, and the extruder needs to be extensively improved, resulting in increased extrusion production costs and a large amount of improvement funds. The present invention has the effect of fully ensuring the quality and efficiency of the polyethylene film scrap recycling production without the need for extensive improvements to the extruder.

[0007] To achieve the above object, the present invention provides the following technical solutions: A polyethylene plastic scrap recycling extruder comprises a base, a reduction motor, an extrusion screw, a support frame, a heating cylinder, a feed frame, a delivery bucket, a crushing assembly, a driving motor and an extrusion assembly, wherein the feed frame is mounted on the top of the heating cylinder, the delivery bucket is mounted on the surface of the feed frame, the crushing assembly is arranged on the inner sides of the feed frame and the delivery bucket, the driving motor is mounted on the outer side of the delivery bucket, and the driving motor is connected to the crushing assembly in a transmission manner, the extrusion assembly is slidably arranged on the inner wall of the feed frame, and the extrusion assembly is threadedly connected to the crushing assembly, when the polyethylene film scrap is put into the delivery bucket, the crushing assembly is crushed by the driving motor, and the crushed polyethylene film scrap falls into the feed frame, and the driving motor drives the crushing assembly to rotate while synchronously driving the extrusion assembly to move up and down reciprocatingly, a gap is generated between the extrusion assembly and the feed frame when the extrusion assembly moves upward, and the extrusion assembly moves in close contact with the inner wall of the feed frame and applies pressure to the polyethylene film scrap when the extrusion assembly moves downward.

[0008] Compared with the polyethylene scraps recycled in other scenarios, in the polyethylene plastic production workshop, the polyethylene scraps produced after trimming and slitting, as well as the head and tail of the roll film, are not contaminated, so they can be directly put into the extruder for secondary production. This kind of scrap does not need to go through the steps of sorting, crushing, cleaning, etc. before extrusion production like the scraps recycled on the market. If the recycled uncontaminated polyethylene film scraps are crushed separately and then extruded, the recycling production steps will increase, thereby affecting the recycling production efficiency of the polyethylene film scraps. To this end, the technical solution adopts the method of directly putting the polyethylene film scraps into the extruder for secondary production, and greatly reduces the adverse effects of the air in the film scraps, effectively ensuring the recycling production quality and production efficiency of the polyethylene film scraps.

[0009] Preferably, an exhaust net is installed on the outer periphery of the feed frame, and the exhaust net is arranged below the stop point of the downward travel of the extrusion assembly, and guide grooves are opened around the inner wall of the feed frame.

[0010] Preferably, the crushing assembly includes a rotating part, a fixed part, a rotating rod and a reciprocating screw, the outer periphery of the rotating rod is rotatably connected to the cross, the cross is installed on the inner periphery of the top of the feed frame, the rotating part is rotationally fitted with the inner wall of the feeding bucket, and the rotating part is transmission-connected to the driving motor, the rotating part is fixedly connected to the rotating rod, the fixed part is rotatably connected to the rotating rod, and the fixed part is fitted to the bottom surface of the rotating part, the fixed part is fixedly connected to the inner periphery of the feeding hopper, the reciprocating screw is installed at the bottom of the rotating rod, and the reciprocating screw is connected to the extrusion assembly.

[0011] Preferably, the rotating part includes a rotating ring, a first impeller and a tooth groove, the first impeller is installed on the outer periphery of the top of the rotating rod, the rotating ring is fixed on the outer periphery of the first impeller, the tooth groove is opened on the outer periphery of the rotating ring, and the tooth groove is meshed with a gear sleeved on the end of the output shaft of the driving motor.

[0012] Preferably, the fixing portion includes a fixing ring and a second impeller, the fixing ring is mounted on the inner circumference of the delivery bucket, the second impeller is mounted on the inner side of the fixing ring, and the inclination direction of the blades of the second impeller is opposite to the inclination direction of the blades of the first impeller.

[0013] Preferably, the extrusion assembly includes a lifting block, a rotating rod and a side material extrusion structure. The lifting block is threadedly connected to the reciprocating screw, and the four rotating rods are respectively inserted around the lifting block. The side material extrusion structure is rotatably arranged on the outer periphery of the rotating rod, and the edges of the side material extrusion structure are in contact with each other.

[0014] Preferably, the edge material extrusion structure includes a trapezoidal plate, a protrusion, a projection and a limiting groove, the protrusions are staggered on one side adjacent to the two trapezoidal plates, and the protrusions are rotatably connected to the rotating rod, the protrusions are integrally formed on the top edge of the protrusions, the limiting grooves are opened on the edge of the trapezoidal plate, and the limiting grooves are staggered with the projections on the corresponding trapezoidal plates.

[0015] Preferably, a columnar bar is installed on the side wall of the trapezoidal plate, and the end of the columnar bar extends into the guide groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention recycles uncontaminated polyethylene film scraps, after the polyethylene film scraps of various shapes are fed into the delivery bucket, the driving motor provides power for the crushing component, so that before the polyethylene film scraps enter the interior of the extruder, under the relative extrusion and shearing action of the crushing component, the polyethylene film scraps are in the shape of short strips or sheets, which effectively reduces the air in the polyethylene film scraps and avoids increasing the burden on the extruder exhaust system due to a large amount of air entering the extruder; in addition, when the crushing component is working, it drives the extrusion component to move up and down continuously. After the extrusion component moves down, it can apply pressure to the short strips or sheets of polyethylene film scraps that fall into the feed frame, further discharge the air in the polyethylene film scraps, and thus greatly reduce the burden on the extruder exhaust system, so as to achieve the effect of not needing to expand the exhaust section cavity volume of the extruder, avoid increasing the energy loss of the extruder production, and effectively ensure the extrusion production efficiency of polyethylene plastics.

[0017] 2. By setting up a crushing assembly and utilizing the relative rotation of the rotating part and the fixed part, the polyethylene plastic scraps can be fully sheared when passing through the rotating part and the fixed part, thereby greatly reducing the size of the polyethylene plastic scraps, so that a large amount of air can be discharged when the polyethylene plastic scraps are just put into the delivery bucket, thereby avoiding the need to significantly improve the existing extruder equipment due to the presence of a large amount of air in the recycled polyethylene plastic film scraps, effectively reducing the improvement cost, and ensuring the quality and efficiency of the extruder in the polyethylene plastic film scrap recycling production.

[0018] 3. Through the set extrusion component, when the crushing component continuously reduces the size of the recycled polyethylene film scraps through shearing, the extrusion component continuously moves back and forth up and down under the action of the crushing component, and the scrap extrusion structure gradually tends to an inverted V shape when moving up, so that a certain gap is generated between adjacent scrap extrusion structures, and the polyethylene film scraps with smaller sizes after shearing enter the feed frame through the gap. Then, when the scrap extrusion structure moves down, pressure is applied to the polyethylene film scraps that fall into the feed frame and are about to enter the heating chamber of the extruder, so that the film scraps are more compact, and the air in the film scraps is greatly reduced, effectively avoiding a series of adverse effects caused by the presence of more air in the recycled polyethylene film scraps. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the crushing assembly of the present invention; Figure 3 An exploded view of the pulverizing assembly of the present invention; Figure 4 It is a schematic structural diagram of the extrusion assembly of the present invention; Figure 5 An exploded view of an extrusion assembly of the present invention; Figure 6 An exploded view of the edge material extrusion structure of the present invention; Figure 7 It is a schematic diagram of the position between the edge material extrusion structure of the present invention, the feed frame and the delivery bucket; Figure 8 It is a structural schematic diagram of the feed frame of the present invention; Fig. 9 It is a cross-sectional view of the feed frame of the present invention.

[0020] In the figure: 1. base; 2. reduction motor; 3. extrusion screw; 4. support frame; 5. heating cylinder; 6. feed frame; 61. exhaust net; 62. guide groove; 7. delivery bucket; 8. crushing assembly; 81. rotating part; 811. rotating ring; 812. first impeller; 813. tooth groove; 82. fixed part; 821. fixed ring; 822. second impeller; 83. rotating rod; 831. cross; 84. reciprocating screw; 9. driving motor; 10. extrusion assembly; 101. lifting block; 102. rotating rod; 103. edge material extrusion structure; 1031. trapezoidal plate; 1032. columnar strip; 1033. convex block; 1034. protrusion; 1035. limit groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figures 1 to 9 The present invention provides a polyethylene plastic edge material recovery extruder, and the technical solution is as follows: Reference Figure 1 and Figure 2A polyethylene plastic edge material recycling extruder includes a base 1, a reduction motor 2, an extrusion screw 3, a support frame 4, and a heating cylinder 5. The base 1 is horizontally arranged and fixed on the flat workshop floor. The reduction motor 2 is installed at one end of the base 1 by bolts. The output shaft of the reduction motor 2 is connected to the end of the extrusion screw 3 through a soft starter to drive the extrusion screw 3 to rotate. The support frames 4 are installed on the surface of the base 1 at equal intervals. The heating cylinder 5 is installed and fixed between multiple support frames 4. The extrusion screw 3 extends into the heating cylinder 5. It also includes a feed frame 6, a delivery bucket 7, a crushing assembly 8, and a drive motor 9. The feeding frame 6 is installed on the top of the heating cylinder 5. The feeding frame 6 is a cubic structure. The feeding port on the top of the heating cylinder 5 is located on the inner side of the feeding frame 6. The film edge material passing through the feeding frame 6 enters the heating cylinder 5 through the feeding port, is heated by the heating cylinder 5, and moves to the side of the machine head under the action of the rotating extrusion screw 3. The feeding hopper 7 is installed on the surface of the feeding frame 6. The top of the feeding frame 6 is structured with a circular hole. The inner circumference of the circular hole is consistent with the inner circumference of the feeding hopper 7. The film material in the feeding hopper 7 enters the feeding frame 6 through the circular hole. The crushing component 8 is arranged between the feeding frame 6 and The driving motor 9 is installed on the inside of the delivery bucket 7 and the outside of the delivery bucket 7, and the driving motor 9 is connected to the crushing assembly 8 by transmission. The driving motor 9 provides power for the crushing assembly 8, so that the film raw material can be fully sheared when passing through the crushing assembly 8, thereby reducing the size of the film raw material, so that it changes from a film shape to a short strip or sheet shape, and effectively discharges a large amount of air in the film edge material. The extrusion assembly 10 is slidably arranged on the inner wall of the feed frame 6, and the extrusion assembly 10 is threadedly connected to the crushing assembly 8. When the crushing assembly 8 is driven by the driving motor 9, the extrusion assembly 10 is threadedly connected to the crushing assembly 8. The extrusion assembly 10 is connected and moves up and down, and then a gap corresponding to the size of the rising stroke is generated on the surface of the extrusion assembly 10, so that the film edge material after passing through the crushing assembly 8 can enter the bottom of the extrusion assembly 10, and the polyethylene film edge material is put into the delivery bucket 7. The crushing assembly 8 crushes it under the action of the driving motor 9, and the crushed polyethylene film edge material falls into the feeding frame 6. When the driving motor 9 drives the crushing assembly 8 to rotate, it simultaneously drives the extrusion assembly 10 to move back and forth up and down. When the extrusion assembly 10 moves up, a gap is generated between it and the feeding frame 6, and when the extrusion assembly 10 moves down, it moves in contact with the inner wall of the feeding frame 6 and applies pressure to the polyethylene film edge material.

[0023] Reference Figure 8 and Fig. 9 As an embodiment of the present invention, specifically, an exhaust net 61 is installed on the outer periphery of the feed frame 6, and the exhaust net 61 is arranged below the stop point of the downward movement of the extrusion component 10. Guide grooves 62 are opened around the inner wall of the feed frame 6. When the extrusion component 10 moves to the lowest point, it is horizontal, and the extrusion component 10 is in contact with the inner wall of the feed frame 6 around, thereby applying pressure to the sheared and crushed film edge material below. During extrusion, excess air is discharged from the feed frame 6 through the exhaust net 61.

[0024] Reference Figure 2 As an embodiment of the present invention, specifically, the crushing assembly 8 includes a rotating part 81, a fixed part 82, a rotating rod 83 and a reciprocating screw rod 84. The outer periphery of the rotating rod 83 is rotatably connected with the cross 831. The cross 831 is installed on the inner periphery of the top of the feed frame 6. The rotating part 81 is rotatably fitted with the inner wall of the delivery bucket 7, and the rotating part 81 is transmission-connected with the driving motor 9. When the driving motor 9 is started, the rotating part 81 is driven to rotate. The rotating part 81 is fixedly connected with the rotating rod 83. When the rotating part 81 rotates, the rotating rod 83 is driven to rotate. The fixed part 82 is rotatably connected with the rotating rod 83. When the rotating rod 83 rotates, the fixed part 82 remains stationary, and the fixed part 82 is attached to the bottom surface of the rotating part 81, the fixed part 82 is fixedly connected to the inner periphery of the feeding hopper, and the reciprocating screw 84 is installed at the bottom of the rotating rod 83. The reciprocating screw 84 rotates with the rotating rod 83, and the reciprocating screw 84 is connected to the extrusion assembly 10. When the drive motor 9 is powered on, it drives the rotating part 81 to rotate, while the fixed part 82 is stationary. Therefore, the rotating part 81 and the fixed part 82 rotate relative to each other, so that the edge of the film can be fully sheared when passing through the rotating part 81 and the fixed part 82.

[0025] Reference Figure 3 As an embodiment of the present invention, specifically, the rotating part 81 includes a rotating ring 811, a first impeller 812 and a tooth groove 813. The first impeller 812 is installed on the outer periphery of the top of the rotating rod 83. The rotating ring 811 is fixed on the outer periphery of the first impeller 812. The tooth groove 813 is opened on the outer periphery of the rotating ring 811, and the tooth groove 813 is engaged with the gear sleeved on the end of the output shaft of the driving motor 9. The rotating ring 811 is connected to the output shaft of the driving motor 9 through the tooth groove 813 and the gear, so that when the power of the driving motor 9 is turned on, the rotating ring 811 and the first impeller 812 can be driven to rotate clockwise. When the first impeller 812 rotates clockwise, the film edge material can be pushed downward so that the film edge material can subsequently pass through the fixing part 82 stably.

[0026] Reference Figure 3 As an embodiment of the present invention, specifically, the fixing portion 82 includes a fixing ring 821 and a second impeller 822, the fixing ring 821 is installed on the inner periphery of the delivery bucket 7, and the second impeller 822 is installed on the inner side of the fixing ring 821, the blade inclination direction of the second impeller 822 is opposite to the blade inclination direction of the first impeller 812, and the second impeller 822 fits the first impeller 812 with each other, when the film edge material passes between the first impeller 812 and the second impeller 822, the bottom of the first impeller 812 and the top of the second impeller 822 act as a "cutter", and then the film edge material is sheared to form short strip edge material or sheet edge material, the stacking range of the film edge material is reduced, and then the air present in the film edge material is greatly reduced.

[0027] Reference Figure 2 , Figure 4 and Figure 5 As an embodiment of the present invention, specifically, the extrusion assembly 10 includes a lifting block 101, a rotating rod 83 and a side material extrusion structure 103. The lifting block 101 is threadedly connected to the reciprocating screw 84. The four rotating rods 83 are respectively inserted around the lifting block 101. The side material extrusion structure 103 is rotatably arranged on the outer periphery of the rotating rod 83, and the edges of the side material extrusion structure 103 are in contact with each other; Figure 5 , Figure 6 and Figure 7 The edge material extrusion structure 103 includes a trapezoidal plate 1031, a convex block 1033, a protrusion 1034 and a limiting groove 1035. The protrusion 1033 is staggered on one side of the two trapezoidal plates 1031, and the protrusion 1033 is rotatably connected to the rotating rod 102. The protrusion 1034 is integrally formed on the top edge of the protrusion 1033. The limiting groove 1035 is opened on the edge of the trapezoidal plate 1031, and the limiting groove 1035 is staggered with the protrusion 1033 on the corresponding trapezoidal plate 1031. The side wall of the trapezoidal plate 1031 is provided with a columnar bar 1032, and the end of the columnar bar 1032 extends into the guide groove 62; when the rotating rod 83 rotates, the reciprocating screw rod 84 is driven to rotate together. When the reciprocating screw rod 84 rotates, since the columnar bar 1032 on the side wall of the trapezoidal plate 1031 is located in the guide groove 62, the lifting block 101 does not change its horizontal angle under the joint action of the rotating rod 102, the trapezoidal plate 1031, the columnar bar 1032 and the guide groove 62, and thus the lifting block 101 is moved to the left and right sides of the lifting block 101. When the multifilament rod 84 rotates, the lifting block 101 reciprocates in the vertical direction. During the upward movement of the lifting block 101, the contact position between the columnar bar 1032 and the guide groove 62 is constantly changed, so that the two trapezoidal plates 1031 in the edge material extrusion structure 103 on the same side of the lifting block 101 rotate downward together around the corresponding rotating rod 102, that is, the two trapezoidal plates 1031 are distributed in an inverted V shape, and a gap is generated between adjacent edge material extrusion structures 103 for the film edge material to fall. When the material extrusion structure 103 moves downward, the two trapezoidal plates 1031 in the same edge material extrusion structure 103 gradually tend to be horizontal, and when the protrusion 1034 of one trapezoidal plate 1031 enters the limiting groove 1035 on the surface of the other trapezoidal plate 1031, the edge material extrusion structure 103 is in a completely horizontal state, thereby exerting pressure on the short strip or sheet film edge material falling into the feed frame 6 below the extrusion assembly 10, and the air generated by the extrusion is discharged through the exhaust net 61.

[0028] Working principle: The edge materials generated by trimming and slitting in the polyethylene plastic film production workshop and the edge materials at the head and tail of the roll film are collected and collected, the extruder is controlled to be in a normal production state, and the power supply of the drive motor 9 is turned on, and then the recycled polyethylene film edge materials are put into the feeding bucket 7. The film edge materials first pass through the crushing component 8, and the film edge materials are sheared into short strips or sheets by the shearing action of the crushing component 8. Then the film edge materials fall from the feeding bucket 7 into the feeding frame 6. The extrusion component 10 continuously moves up and down under the action of the crushing component 8. The film edge materials pass through the gap formed by the extrusion component 10 and the inner wall of the feeding frame 6 when the extrusion component 10 moves up, and then fall under the extrusion component 10. When the extrusion component 10 moves down, the extrusion component 10 gradually eliminates the gap, tends to be horizontal, and then presses the film edge materials below to fully discharge the air in the film edge materials; Specifically, the output shaft of the driving motor 9 drives the rotating ring 811 and the first impeller 812 to rotate through the gear and the tooth groove 813. At the same time, the rotating rod 83 drives the reciprocating screw rod 84 to rotate together. The second impeller 822 rotates relative to the first impeller 812 due to keeping still. Then, when the film edge passes through the first impeller 812 and the second impeller 822, it is fully broken under the shearing action of the first impeller 812 and the second impeller 822, and under the action of the rotating first impeller 812, the film raw material can be pushed downward, and the film raw material has a tendency to move downward. At the same time, when the reciprocating screw rod 84 rotates, the lifting block 101 reciprocates in the vertical direction. During the upward movement of the lifting block 101, the contact position between the columnar bar 1032 and the guide groove 62 is constantly changed, and the lifting block 1 01 The two trapezoidal plates 1031 on the same side rotate downward around the corresponding rotating rod 102 together, and the gap generated between the adjacent edge material extrusion structures 103 is for the film edge material to fall, and then the sheared film edge material falls from the surface of the trapezoidal plate 1031 to the bottom of the trapezoidal plate 1031, and then when the lifting block 101 moves downward, the two trapezoidal plates 1031 on the same side of the lifting block 101 gradually tend to be horizontal, and when the protrusion 1034 of one trapezoidal plate 1031 enters the limiting groove 1035 on the surface of the other trapezoidal plate 1031, the trapezoidal plates 1031 are in a parallel state, and pressure is applied to the short strip or sheet film edge material falling into the feed frame 6 below the extrusion assembly 10, and the air generated by the extrusion is discharged through the exhaust net 61, and then the dense film edge material enters the heating cylinder 5 for secondary extrusion production.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polyethylene plastic edge material recycling extruder, comprising a base (1), a reduction motor (2), an extrusion screw (3), a support frame (4), and a heating cylinder (5), characterized in that: The invention also comprises a feed frame (6), a delivery bucket (7), a crushing assembly (8), a drive motor (9) and an extrusion assembly (10), wherein the feed frame (6) is mounted on the top of the heating cylinder (5), the delivery bucket (7) is mounted on the surface of the feed frame (6), the crushing assembly (8) is arranged on the inner sides of the feed frame (6) and the delivery bucket (7), the drive motor (9) is mounted on the outer side of the delivery bucket (7), and the drive motor (9) is transmission-connected to the crushing assembly (8), the extrusion assembly (10) is slidably arranged on the inner wall of the feed frame (6), and the extrusion assembly (10) is arranged on the inner wall of the feed frame (6). (10) is threadedly connected to the crushing assembly (8). When the polyethylene film edge material is put into the feeding bucket (7), the crushing assembly (8) is crushed by the driving motor (9). The crushed polyethylene film edge material falls into the feeding frame (6). When the driving motor (9) drives the crushing assembly (8) to rotate, it simultaneously drives the extrusion assembly (10) to move up and down reciprocatingly. When the extrusion assembly (10) moves up, a gap is generated between it and the feeding frame (6). When the extrusion assembly (10) moves down, it moves in contact with the inner wall of the feeding frame (6) and applies pressure to the polyethylene film edge material.

2. The polyethylene plastic edge material recovery extruder according to claim 1, characterized in that: An exhaust net (61) is installed on the outer periphery of the feed frame (6), and the exhaust net (61) is arranged below the stop point of the downward travel of the extrusion assembly (10). Guide grooves (62) are provided on all four sides of the inner wall of the feed frame (6).

3. The polyethylene plastic edge material recovery extruder according to claim 1, characterized in that: The crushing assembly (8) comprises a rotating part (81), a fixed part (82), a rotating rod (83) and a reciprocating screw (84); the outer periphery of the rotating rod (83) is rotatably connected to a cross (831); the cross (831) is mounted on the inner periphery of the top of the feed frame (6); the rotating part (81) is rotatably fitted with the inner wall of the delivery bucket (7); the rotating part (81) is transmission-connected with a driving motor (9); the rotating part (81) is fixedly connected to the rotating rod (83); the fixed part (82) is rotatably connected to the rotating rod (83); the fixed part (82) is fitted on the bottom surface of the rotating part (81); the fixed part (82) is fixedly connected to the inner periphery of the delivery bucket; the reciprocating screw (84) is mounted on the bottom of the rotating rod (83); and the reciprocating screw (84) is connected to the extrusion assembly (10).

4. The polyethylene plastic edge material recovery extruder according to claim 3, characterized in that: The rotating part (81) comprises a rotating ring (811), a first impeller (812) and a tooth groove (813); the first impeller (812) is mounted on the outer periphery of the top of the rotating rod (83); the rotating ring (811) is fixed on the outer periphery of the first impeller (812); the tooth groove (813) is provided on the outer periphery of the rotating ring (811), and the tooth groove (813) is meshed with a gear sleeved on the end of the output shaft of the driving motor (9).

5. The polyethylene plastic edge material recovery extruder according to claim 4, characterized in that: The fixing portion (82) comprises a fixing ring (821) and a second impeller (822); the fixing ring (821) is mounted on the inner circumference of the delivery bucket (7); the second impeller (822) is mounted on the inner side of the fixing ring (821); and the inclination direction of the blades of the second impeller (822) is opposite to the inclination direction of the blades of the first impeller (812).

6. The polyethylene plastic edge material recovery extruder according to claim 5, characterized in that: The extrusion assembly (10) comprises a lifting block (101), a rotating rod (83) and a scrap extrusion structure (103); the lifting block (101) is threadedly connected to a reciprocating screw rod (84); four rotating rods (83) are respectively inserted around the lifting block (101); the scrap extrusion structure (103) is rotatably arranged on the outer periphery of the rotating rod (83), and the edges of the scrap extrusion structure (103) are in contact with each other.

7. The polyethylene plastic edge material recovery extruder according to claim 6, characterized in that: The edge material extrusion structure (103) comprises a trapezoidal plate (1031), a convex block (1033), a protrusion (1034) and a limiting groove (1035); the protrusion (1033) is staggeredly arranged on one side adjacent to two trapezoidal plates (1031), and the protrusion (1033) is rotatably connected to the rotating rod (102); the protrusion (1034) is integrally formed on the top edge of the protrusion (1033); the limiting groove (1035) is provided on the edge of the trapezoidal plate (1031), and the limiting groove (1035) and the corresponding protrusion (1033) on the trapezoidal plate (1031) are staggeredly arranged.

8. The polyethylene plastic edge material recovery extruder according to claim 7, characterized in that: A columnar bar (1032) is installed on the side wall of the trapezoidal plate (1031), and the end of the columnar bar (1032) extends into the guide groove (62).

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