A recycling device for defective PE pipes

Abstract

The present invention discloses a recycling and reuse device for defective PE pipes in the technical field of PE pipe recycling, which includes a base and a PE pipe. The PE pipe is located above the base, and conveyor belts are symmetrically arranged on the upper and lower sides of the PE pipe. The lower conveyor belt is drivingly connected to the base; a fixing frame is provided on the upper conveyor belt, and the upper conveyor belt is drivingly connected to the fixing frame; a dividing mechanism is arranged in the sliding frame, and the dividing mechanism is used to divide the PE pipe along the axial direction; a pressing mechanism is arranged in the sliding frame, and the pressing mechanism is used to press the divided parts of the PE pipe into a flat shape; a crushing mechanism is arranged on the sliding frame, and the crushing mechanism is used to crush the PE pipe parts pressed into a flat shape into fragments; the device can cut the PE pipe into two parts, and then press the two parts into a flat shape, so as to achieve the effect of facilitating crushing, and can effectively avoid the fragments from popping out and hurting the staff during crushing.

Description

Technical Field

[0001] The present invention relates to the technical field of PE pipe recycling, and specifically to a recycling and reuse device for defective PE pipes. Background Art

[0002] When producing PE pipes, it is inevitable to have defective products. For defective PE pipes, they are usually crushed into pieces, and then the pieces are made into PE pellets through a granulating machine to achieve the effect of recycling; however, in the existing PE pipe crushing, usually an entire pipe body is directly placed into the crusher, and the crusher starts crushing from the end position of the PE pipe; since the inside of the PE pipe is empty, when the crusher crushes, the crushing equipment usually applies a crushing force from the outside of the PE pipe, and the crushed part of the PE pipe will sink inward. When the stressed part of the PE pipe sinks to a certain extent, the stressed part will separate from the whole PE pipe. At this time, the PE pipe starts to rebound, and there is a high probability that the PE pipe will bounce off some pieces or pieces that have not completely separated when it rebounds, and the bounced pieces are likely to hurt the staff. Summary of the Invention

[0003] The purpose of the present invention is to provide a recycling and reuse device for defective PE pipes to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A recycling and reuse device for defective PE pipes, including a base and a PE pipe. The PE pipe is located above the base, and conveyor belts are symmetrically arranged on the upper and lower sides of the PE pipe. The lower conveyor belt is drivingly connected to the base; a fixing frame is arranged on the upper conveyor belt, and the upper conveyor belt is drivingly connected to the fixing frame; a sliding frame is arranged in front of the PE pipe on the base, and through grooves penetrating the base are symmetrically opened on the left and right sides at the bottom of the sliding frame, and the sliding frame is slidably connected to the two through grooves;

[0005] A splitting mechanism is arranged in the sliding frame, and the splitting mechanism is used to split the PE pipe along the axial direction;

[0006] A pressing mechanism is arranged in the sliding frame, and the pressing mechanism is used to press the split part of the PE pipe into a flat shape;

[0007] A crushing mechanism is arranged on the sliding frame, and the crushing mechanism is used to crush the part of the PE pipe pressed into a flat shape into pieces.

[0008] Preferably, the splitting mechanism includes two cutting knives, which are symmetrically distributed on the left and right sides of the PE pipe and are respectively in contact with the left and right sides of the PE pipe; a support plate is arranged in the sliding frame, and the left and right ends of the support plate are symmetrically and fixedly connected with first sliders, and both of the first sliders are slidably connected with the sliding frame; expansion plates are slidably connected to the left and right sides of the support plate, and the upper and lower parts of the expansion plates are respectively inclined upward and downward.

[0009] Preferably, a first motor is fixedly connected to the middle position of the support plate. The first motor is a double-shaft motor, and both ends of the output shaft of the first motor are fixedly connected with first threaded rods. The first threaded rods on the left and right sides are respectively rotatably connected with the first sliders on the left and right sides, and the thread directions of the first threaded rods on the left and right sides are opposite.

[0010] Preferably, a telescopic rod is arranged between the expansion plate and the cutting knife, and the front and rear ends of the telescopic rod are respectively fixedly connected with the expansion plate and the cutting knife; fixing rods are fixedly connected to the left and right sides of the two cutting knives on the base, and a support rod is sleeved on the two fixing rods, and both of the cutting knives are slidably connected with the support rod.

[0011] Preferably, the pressing mechanism includes two first pressing rollers, which are symmetrically distributed on the upper and lower sides of the support plate, and the distance between the two first pressing rollers is less than the width of the front part of the expansion plate; the first pressing rollers are located inside the expansion plate and are in clearance fit with the expansion plate; mounting frames are symmetrically arranged on the upper and lower sides of the support plate, and second pressing rollers are rotatably connected in the mounting frames. The two first pressing rollers and the two second pressing rollers are in the same vertical plane; the lower mounting frame is fixedly connected with the sliding frame, and the left and right sides of the upper mounting frame are symmetrically and fixedly connected with second sliders, and both of the second sliders are slidably connected with the sliding frame; a driving mechanism is arranged on the sliding frame, and the driving mechanism is used to drive the first pressing rollers on the upper and lower sides to move upward and downward respectively to a position where they are in contact with the second pressing rollers on the upper and lower sides.

[0012] Preferably, the driving mechanism includes a second motor which is fixedly connected to the support frame, and the upper end of the output shaft of the second motor is fixedly connected with a first pulley. A belt is arranged on the first pulley, and second pulleys are symmetrically arranged on the left and right sides of the first pulley. The second pulley is rotationally connected to the sliding frame, and the belt is simultaneously meshed with the first pulley and the two second pulleys. The bottom end of the second pulley is fixedly connected with a driving rod, and the driving rod penetrates through the first slider, the second slider and the bottom side part of the sliding frame. A bidirectional threaded rod is rotationally connected to the first slider, the upper part of the bidirectional threaded rod penetrates through the second slider and is in clearance fit with the second slider, and the lower part of the bidirectional threaded rod penetrates through the bottom side part of the sliding frame and is in clearance fit with the bottom side part of the sliding frame. The driving rod penetrates through the bidirectional threaded rod and is slidably connected with the bidirectional threaded rod. The bidirectional threaded rod has self-locking property, and driving blocks are threadedly connected to both the upper and lower sides of the bidirectional threaded rod. The upper and lower driving blocks are respectively rotationally connected with the upper and lower first pressing rollers.

[0013] Preferably, the crushing mechanism includes two crushing boxes which are respectively fixedly connected to the upper and lower mounting frames and are located in front of the second pressing roller in front of the crushing inlet.

[0014] Preferably, a lifting plate is arranged above the base. The rear end of the lifting plate is fixedly connected to the fixed frame, and the lifting plate is located within the sliding frame. The lifting plate is slidably connected to the upper mounting frame, and cylinders are symmetrically fixedly connected to the front and rear sides of the lifting plate. The cylinders are used to drive the lifting plate to rise and fall.

[0015] Preferably, first connecting rods are symmetrically rotationally connected to the left and right sides of the fixed frame, and the front ends of the two first connecting rods are both rotationally connected to the sliding frame.

[0016] Preferably, two second connecting rods are arranged on the first slider. The middle parts of the two second connecting rods are rotationally connected to the first slider, and the two second connecting rods are in a crossed shape. The upper and lower ends of the second connecting rod are respectively rotationally connected to a third connecting rod and a fourth connecting rod. The upper ends of the two upper third connecting rods are rotationally connected to the second slider. The bottom ends of the two lower fourth connecting rods are rotationally connected to the bottom side part of the sliding frame.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The present invention drives a PE pipe to move forward by starting two conveyor belts. When the PE pipe moves, the dividing mechanism can divide the PE pipe into two parts. At this time, the two divided parts are in the shape of two semi - circular arcs, which are not convenient for crushing. The pressing mechanism can press the two semi - circular arc - shaped PE pipes into a flat shape; when the two parts divided from the PE pipe are both pressed flat, the crushing mechanism can easily crush this part into fragments; this device can cut the PE pipe into two parts, and then press the two parts into a flat shape, so as to achieve the effect of facilitating crushing, and can effectively avoid fragments from popping out and hurting the staff during crushing.

[0019] The present invention can drive the upper fixed frame to move up and down by driving the lifting plate to move up and down, and then can drive the upper conveyor belt to move up and down, which can achieve the effect of conveying PE pipes with different diameters; when the diameter of the PE pipe is relatively large, when the fixed frame moves upward, it can push the sliding frame forward through two first connecting rods, enabling the sliding frame to move away from the cutting point, and the part in the sliding frame for pressing the PE pipe is even farther from the cutting point, thus effectively improving the pressing effect on the PE pipe. Brief Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is the rear - view structural schematic diagram of the present invention;

[0022] Figure 3 is the disassembled structural schematic diagram of the present invention;

[0023] Figure 4 is the structural schematic diagram of the conveyor belt in the present invention;

[0024] Figure 5 is the structural schematic diagram of the sliding frame in the present invention;

[0025] Figure 6 is the disassembled structural schematic diagram of the sliding frame in the present invention;

[0026] Figure 7 is the structural schematic diagram of the driving mechanism in the present invention;

[0027] Figure 8 is the structural schematic diagram of the dividing mechanism in the present invention;

[0028] Figure 9 is the structural schematic diagram of the pressing mechanism in the present invention.

[0029] Reference numerals: 1, base; 2, PE pipe; 3, conveyor belt; 4, fixed frame; 5, sliding frame; 6, chute; 7, cutting knife; 8, support plate; 9, first slider; 10, expansion plate; 11, first motor; 12, first threaded rod; 13, telescopic rod; 14, fixed rod; 15, support rod; 16, first pressing roller; 17, mounting frame; 18, second pressing roller; 19, second slider; 20, second motor; 21, first pulley; 22, belt; 23, second pulley 23; 24, drive rod; 25, bidirectional threaded rod; 26, drive block; 27, crushing box; 28, lifting plate; 29, cylinder; 30, first connecting rod; 31, second connecting rod; 32, third connecting rod; 33, fourth connecting rod. Detailed implementation mode

[0030] Please refer to Figures 1-9 , the present invention provides a technical solution: a device for recycling and reusing defective PE pipes, including a base 1 and a PE pipe 2. The PE pipe 2 is located above the base 1, and conveyor belts 3 are symmetrically arranged on the upper and lower sides of the PE pipe 2. The lower conveyor belt 3 is in transmission connection with the base 1; a fixed frame 4 is arranged on the upper conveyor belt 3, and the upper conveyor belt 3 is in transmission connection with the fixed frame 4; a sliding frame 5 is arranged in front of the PE pipe 2 on the base 1, and chutes 6 penetrating the base 1 are symmetrically opened on the left and right sides at the bottom of the sliding frame 5 on the base 1. The sliding frame 5 is slidably connected to the two chutes 6;

[0031] A splitting mechanism is arranged in the sliding frame 5, and the splitting mechanism is used to split the PE pipe 2 along the axial direction;

[0032] A pressing mechanism is arranged in the sliding frame 5, and the pressing mechanism is used to press the split parts of the PE pipe 2 into a flat shape;

[0033] A crushing mechanism is arranged on the sliding frame 5, and the crushing mechanism is used to crush the part of the PE pipe 2 pressed into a flat shape into fragments;

[0034] During operation, the PE pipe 2 to be crushed is placed between the two conveyor belts 3, and then the two conveyor belts 3 are started to drive the PE pipe 2 to move forward. When the PE pipe 2 moves, the splitting mechanism can split the PE pipe 2 into two parts. At this time, the two split parts are in the shape of two semi - circular arcs, which are not convenient for crushing. The pressing mechanism can press the two semi - circular arc - shaped PE pipes 2 into a flat shape; when the two split parts of the PE pipe 2 are both pressed flat, the crushing mechanism can easily crush this part into fragments; this device can cut the PE pipe 2 into two parts, and then press the two parts into a flat shape, so as to facilitate crushing, and can effectively prevent the fragments from popping out and hurting the staff during crushing.

[0035] Such as Figure 4 ,Figure 8 As shown in the figure, as a further solution of the present invention, the splitting mechanism includes two cutting knives 7. The two cutting knives 7 are symmetrically distributed on the left and right sides of the PE pipe 2 and are respectively in contact with the left and right side parts of the PE pipe 2; a support plate 8 is arranged in the sliding frame 5. Symmetrically fixed connections are provided at the left and right ends of the support plate 8 with first sliders 9. Both of the two first sliders 9 are slidably connected to the sliding frame 5; symmetrically slidably connected at the left and right positions on the support plate 8 are expansion plates 10. The upper and lower side parts of the expansion plates 10 are respectively inclined upward and downward;

[0036] A first motor 11 is fixedly connected at the middle position of the support plate 8. The first motor 11 is a biaxial motor and fixedly connected to the left and right ends of the output shaft of the first motor 11 are first threaded rods 12. The left and right first threaded rods 12 are respectively rotationally connected to the left and right first sliders 9 and the left and right first threaded rods 12 have opposite thread directions;

[0037] An expansion link 13 is arranged between the expansion plate 10 and the cutting knife 7. The front and rear ends of the expansion link 13 are respectively fixedly connected to the expansion plate 10 and the cutting knife 7; fixed rods 14 are fixedly connected at the left and right positions of the base 1 on both sides of the two cutting knives 7. A support rod 15 is sleeved on the two fixed rods 14. Both of the two cutting knives 7 are slidably connected to the support rod 15;

[0038] During operation, when the two conveyor belts 3 drive the PE pipe 2 to move forward, the left and right side parts at the front end of the PE pipe 2 will be cut open by the two cutting knives 7. Due to the thickness difference between the blade and the back of the cutting knife 7, the cut of the PE pipe 2 will be enlarged by the cutting knife 7; when the front end part of the PE pipe 2 moves to the position of the expansion plate 10, at this time the rear end of the expansion plate 10 will be directly inside the cut of the PE pipe 2. As the PE pipe 2 continues to move forward, the upper and lower side parts of the PE pipe 2 will be respectively squeezed upward and downward by the expansion plate 10, and the cut of the PE pipe 2 is further enlarged, facilitating subsequent flattening;

[0039] When the diameter of the PE pipe 2 to be crushed is relatively large, at this time, by driving the two first sliders 9 to slide upward in the sliding frame 5 to drive the support plate 8 to slide upward, the support plate 8 drives the two expansion plates 10 to move upward, and the expansion plates 10 drive the cutting knives 7 to move upward through the expansion links 13; when the cutting knives 7 move to the height where the center of the PE pipe 2 is located, the movement of the support plate 8 can be stopped. At this time, start the first motor 11. The first motor 11 drives the left and right first threaded rods 12 to rotate. The left and right first threaded rods 12 respectively drive the left and right expansion plates 10 to move left and right. The expansion plates 10 drive the cutting knives 7 to move. When the cutting knives 7 move to the position in contact with the pipe wall of the PE pipe 2, the first motor 11 can be stopped.

[0040] As Figures 7-9As shown in the figure, as a further solution of the present invention, the pressing mechanism includes two first pressing rollers 16, the two first pressing rollers 16 are symmetrically distributed on the upper and lower sides of the support plate 8 and the distance between the two first pressing rollers 16 is less than the width of the front part of the expansion plate 10; the first pressing rollers 16 are located inside the expansion plate 10 and are in clearance fit with the expansion plate 10; mounting brackets 17 are symmetrically arranged at the upper and lower sides of the support plate 8, a second pressing roller 18 is rotatably connected inside the mounting bracket 17, and the two first pressing rollers 16 and the two second pressing rollers 18 are in the same vertical plane; the lower mounting bracket 17 is fixedly connected to the sliding bracket 5 and second sliders 19 are symmetrically fixedly connected to the left and right sides of the upper mounting bracket 17, and the two second sliders 19 are both slidably connected to the sliding bracket 5; a driving mechanism is arranged on the sliding bracket 5, and the driving mechanism is used to drive the upper and lower first pressing rollers 16 to move upward and downward respectively to a position where they are in contact with the upper and lower second pressing rollers 18;

[0041] The driving mechanism includes a second motor 20, the second motor 20 is fixedly connected to the support frame and a first pulley 21 is fixedly connected to the upper end of the output shaft of the second motor 20. A belt 22 is arranged on the first pulley 21 and second pulleys 23 are symmetrically arranged on the left and right sides of the first pulley 21. The second pulley 23 is rotatably connected to the sliding bracket 5 and the belt 22 is meshed with the first pulley 21 and the two second pulleys 23 at the same time; a driving rod 24 is fixedly connected to the bottom end of the second pulley 23, and the driving rod 24 penetrates through the first slider 9, the second slider 19 and the bottom part of the sliding bracket 5; a bidirectional threaded rod 25 is rotatably connected to the first slider 9, the upper part of the bidirectional threaded rod 25 penetrates through the second slider 19 and is in clearance fit with the second slider 19, and the lower part of the bidirectional threaded rod 25 penetrates through the bottom part of the sliding bracket 5 and is in clearance fit with the bottom part of the sliding bracket 5; the driving rod 24 penetrates through the bidirectional threaded rod 25 and is slidably connected to the bidirectional threaded rod 25; the bidirectional threaded rod 25 has self-locking property and driving blocks 26 are threadedly connected to the upper and lower parts of the bidirectional threaded rod 25, and the upper and lower driving blocks 26 are respectively rotatably connected to the upper and lower first pressing rollers 16;

[0042] During operation, when the two cut parts of the PE pipe 2 pass through the two expansion plates 10, the expansion plates 10 squeeze the two lower side parts of the PE pipe 2 upward and downward respectively. When the cut part of the upper PE pipe 2 moves to the position between the first pressing roller 16 and the second pressing roller 18, the second motor 20 is started at this time. The second motor 20 drives the first pulley 21 to rotate. The first pulley 21 drives the two second pulleys 23 to rotate through the belt 22. The second pulley 23 drives the driving rod 24 to rotate. When the driving rod 24 rotates, it drives the bidirectional threaded rod 25 to rotate. When the bidirectional threaded rod 25 rotates, it drives the driving blocks 26 on the upper and lower sides to move upward and downward respectively. At this time, the upper first pressing roller 16 starts to move upward and the lower first pressing roller 16 starts to move downward; when the first pressing roller 16 moves, it cooperates with the second pressing roller 18 to start pressing the cut part of the PE pipe 2. When the first pressing roller 16 moves to a position close to the second pressing roller 18 and the distance between the first pressing roller 16 and the second pressing roller 18 is equal to the thickness of the PE pipe 2, at this time, the cut part of the PE pipe 2 is completely pressed from a semicircular shape into a flat shape;

[0043] When the diameter of the PE pipe 2 to be crushed is relatively large, by driving the two second sliders 19 to slide upward simultaneously, the upper mounting frame 17 is driven to move upward. The upper mounting frame 17 drives the upper second pressing roller 18 to move upward. When the upper pressing roller just moves to the position above the PE pipe 2, it is okay. At this time, it can be ensured that the cut part of the PE pipe 2 can pass through between the first pressing roller 16 and the second pressing roller 18 when moving forward.

[0044] As Figure 9 shown, as a further scheme of the present invention, the crushing mechanism includes two crushing boxes 27. The two crushing boxes 27 are respectively fixedly connected to the upper and lower mounting frames 17 and are located in front of the second pressing roller 18 in front of the crushing inlet;

[0045] During operation, when the cut part of the PE pipe 2 flattened by the first pressing roller 16 and the second pressing roller 18 crosses the first pressing roller 16 and the second pressing roller 18, this part will directly enter the crushing box 27 through the opening of the crushing box 27, and then start the crushing box 27 to crush this part into pieces.

[0046] As Figures 2-3 、 Figure 5 shown, as a further scheme of the present invention, a lifting plate 28 is provided above the base 1. The rear end of the lifting plate 28 is fixedly connected to the fixing frame 4 and the lifting plate 28 is located in the sliding frame 5; the lifting plate 28 is slidably connected to the upper mounting frame 17 and air cylinders 29 are symmetrically fixedly connected to the front and rear positions on the lifting plate 28. The air cylinders 29 are used to drive the lifting plate 28 to rise and fall;

[0047] On the left and right sides of the fixing frame 4, the first connecting rods 30 are symmetrically and rotatably connected, and one end of the front sides of the two first connecting rods 30 is rotatably connected to the sliding frame 5;

[0048] Two second connecting rods 31 are provided on the first slider 9. The middle parts of the two second connecting rods 31 are rotatably connected to the first slider 9 and the two second connecting rods 31 are in a crossed shape; the upper and lower ends of the second connecting rod 31 are rotatably connected to a third connecting rod 32 and a fourth connecting rod 33 respectively. The upper ends of the two upper third connecting rods 32 are rotatably connected to the second slider 19; the bottom ends of the two lower fourth connecting rods 33 are rotatably connected to the bottom side of the sliding frame 5;

[0049] During operation, by starting the two cylinders 29, the lifting plate 28 can be driven to rise and fall. The lifting plate 28 drives the upper conveyor belt 3 to rise and fall through the fixing frame 4, so as to achieve the effect of conveying PE pipes 2 with various different diameters; since the larger the diameter of the PE pipe 2, the farther the position pressing its cut part needs to be from the cut point. When it is necessary to crush a PE pipe 2 with a larger diameter, it is necessary to start the cylinder 29 to drive the lifting plate 28 to rise. The lifting plate 28 drives the fixing frame 4 to move upward. The fixing frame 4 will push the sliding frame 5 to slide forward through the two first connecting rods 30. When the sliding frame 5 slides forward, it will move away from the cutting point; when the lifting plate 28 moves upward, it will also drive the upper mounting frame 17 to move upward; when the upper mounting frame 17 moves upward, the second sliders 19 on the left and right sides drive the first slider 9 to move upward through the two second connecting rods 31, the two third connecting rods 32 and the two fourth connecting rods 33. The first slider 9 always remains in the middle position between the upper and lower mounting frames 17 during the upward movement process; since the upper mounting frame 17 is located at the upper end position of the PE pipe 2 and the lower mounting frame 17 is located at the bottom end position of the PE pipe 2, no matter how the upper mounting frame 17 moves, it can ensure that the cutting knife 7 is in the center position of the PE pipe 2.

Claims

1. A recycling and reuse device for defective PE pipes, comprising a base (1) and a PE pipe (2), characterized in that: The PE pipe (2) is located above the base (1), and conveyor belts (3) are symmetrically arranged on the upper and lower sides of the PE pipe (2). The lower conveyor belt (3) is drivingly connected to the base (1); a fixing frame (4) is arranged on the upper conveyor belt (3), and the upper conveyor belt (3) is drivingly connected to the fixing frame (4); a sliding frame (5) is arranged in front of the PE pipe (2) on the base (1), and sliding grooves (6) penetrating the base (1) are symmetrically formed on the left and right sides at the bottom of the sliding frame (5) on the base (1), and the sliding frame (5) is slidably connected to the two sliding grooves (6). A splitting mechanism is arranged in the sliding frame (5), and the splitting mechanism is used for splitting the PE pipe (2) along the axial direction. A pressing mechanism is arranged in the sliding frame (5), and the pressing mechanism is used for pressing the split part of the PE pipe (2) into a flat shape. A crushing mechanism is arranged on the sliding frame (5), and the crushing mechanism is used for crushing the part of the PE pipe (2) pressed into a flat shape into fragments. A support plate (8) is arranged in the sliding frame (5), and first sliders (9) are symmetrically and fixedly connected to the left and right ends of the support plate (8). Both of the first sliders (9) are slidably connected to the sliding frame (5). The pressing mechanism includes two first pressing rollers (16). The two first pressing rollers (16) are symmetrically distributed on the upper and lower sides of the support plate (8), and the distance between the two first pressing rollers (16) is less than the width of the front part of the expansion plate (10); the first pressing rollers (16) are located inside the expansion plate (10) and are in clearance fit with the expansion plate (10); mounting frames (17) are symmetrically arranged on the upper and lower sides of the support plate (8), and second pressing rollers (18) are rotatably connected inside the mounting frames (17). The two first pressing rollers (16) and the two second pressing rollers (18) are in the same vertical plane; the lower mounting frame (17) is fixedly connected to the sliding frame (5), and second sliders (19) are symmetrically and fixedly connected to the left and right sides of the upper mounting frame (17). Both of the second sliders (19) are slidably connected to the sliding frame (5); a driving mechanism is arranged on the sliding frame (5), and the driving mechanism is used for driving the upper and lower first pressing rollers (16) to move upward and downward respectively to a position where they are in contact with the upper and lower second pressing rollers (18).

2. The recycling and reuse device for defective PE pipes according to claim 1, wherein: The splitting mechanism includes two cutting knives (7). The two cutting knives (7) are symmetrically distributed on the left and right sides of the PE pipe (2), and the two cutting knives (7) are respectively in contact with the left and right parts of the PE pipe (2); expansion plates (10) are symmetrically and slidably connected to the left and right sides of the support plate (8), and the upper and lower parts of the expansion plates (10) are respectively inclined upward and downward.

3. The recycling and reuse device for defective PE pipes according to claim 1, characterized in that: A first motor (11) is fixedly connected to the middle position of the support plate (8). The first motor (11) is a double-shaft motor, and both left and right ends of the output shaft of the first motor (11) are fixedly connected with first threaded rods (12). The left and right first threaded rods (12) are respectively rotationally connected to the left and right first sliders (9), and the screw directions of the left and right first threaded rods (12) are opposite.

4. The recycling and reuse device for defective PE pipes according to claim 2, wherein: An expansion rod (13) is provided between the expansion plate (10) and the cutting knife (7). The front and rear ends of the expansion rod (13) are respectively fixedly connected to the expansion plate (10) and the cutting knife (7); Fixed rods (14) are fixedly connected to the left and right sides of the base (1) at the positions of the two cutting knives (7). A support rod (15) is sleeved on the two fixed rods (14), and the two cutting knives (7) are both slidably connected to the support rod (15).

5. The recycling and reuse device for defective PE pipes according to claim 1, wherein: The driving mechanism includes a second motor (20). The second motor (20) is fixedly connected to the support frame, and the upper end of the output shaft of the second motor (20) is fixedly connected with a first pulley (21). A belt (22) is provided on the first pulley (21), and second pulleys (23) are symmetrically arranged on the left and right sides of the first pulley (21). The second pulleys (23) are rotationally connected to the sliding frame (5), and the belt (22) is simultaneously engaged with the first pulley (21) and the two second pulleys (23); A driving rod (24) is fixedly connected to the bottom end of the second pulley (23). The driving rod (24) penetrates through the first slider (9), the second slider (19), and the bottom side part of the sliding frame (5); A bidirectional threaded rod (25) is rotationally connected to the first slider (9). The upper part of the bidirectional threaded rod (25) penetrates through the second slider (19) and has a clearance fit with the second slider (19). The lower part of the bidirectional threaded rod (25) penetrates through the bottom side part of the sliding frame (5) and has a clearance fit with the bottom side part of the sliding frame (5); The driving rod (24) penetrates through the bidirectional threaded rod (25) and is slidably connected to the bidirectional threaded rod (25); The bidirectional threaded rod (25) has self-locking property, and driving blocks (26) are threadedly connected to both the upper and lower parts of the bidirectional threaded rod (25). The upper and lower driving blocks (26) are respectively rotationally connected to the upper and lower first pressing rollers (16).

6. The recycling and reuse device for defective PE pipes according to claim 1, wherein: The crushing mechanism includes two crushing boxes (27). The two crushing boxes (27) are respectively fixedly connected to the upper and lower mounting frames (17) and are located in front of the second pressing roller (18) in front of the crushing inlet.

7. The recycling and reuse device for defective PE pipes according to claim 1, characterized in that: A lifting plate (28) is provided above the base (1). The rear end of the lifting plate (28) is fixedly connected to the fixed frame (4), and the lifting plate (28) is located inside the sliding frame (5); The lifting plate (28) is slidably connected to the upper mounting frame (17), and air cylinders (29) are symmetrically fixedly connected to the front and rear positions on the lifting plate (28). The air cylinders (29) are used to drive the lifting plate (28) to rise and fall.

8. The recycling and reuse device for defective PE pipes according to claim 1, characterized in that: On the left and right sides of the fixing frame (4), the first connecting rods (30) are symmetrically and rotatably connected, and the front ends of the two first connecting rods (30) are rotatably connected to the sliding frame (5).

9. The recycling and reuse device for defective PE pipes according to claim 1, wherein: Two second connecting rods (31) are provided on the first slider (9). The middle parts of the two second connecting rods (31) are rotatably connected to the first slider (9), and the two second connecting rods (31) are in a crossed shape; the upper and lower ends of the second connecting rod (31) are respectively rotatably connected to a third connecting rod (32) and a fourth connecting rod (33). The upper ends of the two upper third connecting rods (32) are rotatably connected to the second slider (19); the bottom ends of the two lower fourth connecting rods (33) are rotatably connected to the bottom side of the sliding frame (5).

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