PE pipe defective product recycling device

Abstract

The PE pipe defective product recycling and reusing device comprises a base and a PE pipe, the PE pipe is located above the base, conveying belts are symmetrically arranged on the upper side and the lower side of the PE pipe, and the conveying belt on the lower side is in transmission connection with the base; a fixing frame is arranged on the upper side conveying belt, and the upper side conveying belt is in transmission connection with the fixing frame; a cutting mechanism is arranged in the sliding frame and used for cutting the PE pipe in the axis direction. A pressing mechanism is arranged in the sliding frame and used for pressing the divided part of the PE pipe into a plane shape. A crushing mechanism is arranged on the sliding frame and is used for crushing the PE pipe part which is pressed into a plane shape into fragments; according to the device, a PE pipe can be cut into two parts, and then the two parts are pressed into a plane shape, so that the effect of facilitating crushing can be achieved, and fragments can be effectively prevented from popping up to hurt workers during crushing.

Description

Technical Field

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

[0002] It is unavoidable that defective products will appear in the production of PE pipes. For the defective PE pipes, they are usually crushed into fragments, and then the fragments are made into PE granules through a granulation mechanism to achieve the effect of recycling. However, when the existing PE pipes are crushed, the whole pipe body is usually directly placed in the crusher, and the crusher starts to crush from the end of the PE pipe. Since the inside of the PE pipe is empty, when the crusher is crushing, the crushing equipment usually applies a crushing force from the outside of the PE pipe, and the crushed part of the PE pipe will be concave inward. When the stressed part of the PE pipe is concave to a certain extent, the stressed part will be separated from the PE pipe as a whole. At this time, the PE pipe starts to rebound. When the PE pipe rebounds, there is a high probability that some fragments or fragments that have not been completely separated will be ejected, and the flying fragments are likely to injure the staff. Summary of the invention

[0003] The purpose of the present invention is to provide a PE pipe defective product recovery and reuse device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a PE pipe defective product recycling and reuse device, comprising a base and a PE pipe, wherein the PE pipe is located above the base and conveyor belts are symmetrically arranged at the upper and lower sides of the PE pipe, and the conveyor belt at the lower side is transmission-connected with the base; a fixed frame is arranged on the upper side of the conveyor belt and the upper conveyor belt is transmission-connected with the fixed frame; a sliding frame is arranged on the base in front of the PE pipe and slide grooves penetrating the base are symmetrically arranged at the left and right sides of the bottom of the sliding frame on the base, and the sliding frame is slidably connected with the two slide grooves; The sliding frame is provided with a splitting mechanism, and the splitting mechanism is used to split the PE pipe along the axial direction; A pressing mechanism is provided in the sliding frame, and the pressing mechanism is used to press the cut parts of the PE pipe into a flat shape; The sliding frame is provided with a crushing mechanism, and the crushing mechanism is used to crush the PE pipe part pressed into a plane into fragments.

[0005] Preferably, the dividing mechanism includes two cutting knives, which are symmetrically distributed on the left and right sides of the PE pipe and respectively fit the left and right side parts of the PE pipe; a support plate is provided in the sliding frame, and the left and right ends of the support plate are symmetrically fixedly connected with first sliders, and the two first sliders are both slidably connected to the sliding frame; the left and right sides of the support plate are symmetrically slidably connected with expansion plates, and the upper and lower side parts of the expansion plate are respectively inclined upward and downward.

[0006] Preferably, a first motor is fixedly connected to the middle position of the support plate, the first motor is a dual-axis motor and the left and right ends of the first motor output shaft are fixedly connected to the first threaded rods, the first threaded rods on the left and right sides are respectively rotatably connected to 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.

[0007] Preferably, a telescopic rod is provided between the expansion plate and the cutting knife, and the front and rear ends of the telescopic rod are fixedly connected to the expansion plate and the cutting knife respectively; fixed 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 fixed rods, and the two cutting knives are slidably connected to the support rods.

[0008] Preferably, the pressing mechanism includes two first pressing rollers, which are symmetrically distributed at the upper and lower sides of the support plate and the distance between the two first pressing rollers is smaller than the width of the front part of the expansion plate; the first pressing roller is located inside the expansion plate and is gap-matched with the expansion plate; mounting frames are symmetrically provided at the upper and lower sides of the support plate, and second pressing rollers are rotatably connected inside the mounting frames, and the two first pressing rollers and the two second pressing rollers are in the same vertical plane; the mounting frame on the lower side is fixedly connected to the sliding frame and the second sliders are symmetrically fixedly connected at the left and right sides of the mounting frame on the upper side, and the two second sliders are slidably connected to the sliding frame; a driving mechanism is provided 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 positions that fit with the second pressing rollers on the upper and lower sides.

[0009] Preferably, the driving mechanism comprises a second motor, the second motor being fixedly connected to the support frame and the upper end of the second motor output shaft being fixedly connected to the first pulley, the first pulley being provided with a belt and second pulleys being symmetrically provided at the left and right sides of the first pulley, the second pulley being rotatably connected to the sliding frame, and the belt simultaneously meshes with the first pulley and the two second pulleys; the lower end of the second pulley is fixedly connected to a driving rod, the driving rod passes through the first sliding block and the second sliding block and the bottom side part of the sliding frame; the first sliding block is rotatably connected to a bidirectional threaded rod, the upper end part of the bidirectional threaded rod passes through the second sliding block and has a clearance fit with the second sliding block, and the lower end part of the bidirectional threaded rod passes through the bottom side part of the sliding frame and has a clearance fit with the bottom part of the sliding frame; the driving rod passes through the bidirectional threaded rod and is slidably connected to the bidirectional threaded rod; the bidirectional threaded rod is self-locking and the upper and lower side parts of the bidirectional threaded rod are threadedly connected to the driving blocks, and the driving blocks on the upper and lower sides are respectively rotatably connected to the first pressing rollers on the upper and lower sides.

[0010] Preferably, the pulverizing mechanism comprises two pulverizing boxes, which are respectively fixedly connected to the mounting frames at the upper and lower sides and are located in front of the second pressing roller in front of the pulverizing inlet.

[0011] Preferably, a lifting plate is provided above the base, the rear end of the lifting plate is fixedly connected to the fixed frame and the lifting plate is located in 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, and the cylinders are used to drive the lifting plate to rise and fall.

[0012] Preferably, first connecting rods are symmetrically rotatably connected to the left and right sides of the fixed frame, and one end of the front side of two first connecting rods is rotatably connected to the sliding frame.

[0013] Preferably, two second connecting rods are provided on the first slider, the middle parts of the two second connecting rods are rotatably connected to the first slider and the two second connecting rods are in a cross shape; the upper and lower ends of the second connecting rod are rotatably connected to the third connecting rod and the fourth connecting rod, respectively, and the upper end parts of the two third connecting rods on the upper side are rotatably connected to the second slider; the bottom end parts of the two fourth connecting rods on the lower side are rotatably connected to the bottom side part of the sliding frame.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention starts two conveyor belts to drive the PE pipe to move forward. When the PE pipe moves, the PE pipe can be divided into two parts by a dividing mechanism. At this time, the two divided parts are in two semi-circular arc shapes, which are not convenient for crushing. The two semi-circular arc-shaped PE pipes can be pressed into a flat shape by a pressing mechanism; when the two divided parts of the PE pipe are pressed flat, the parts can be easily crushed into fragments by a crushing mechanism; the device can cut the PE pipe into two parts, and then press the two parts into a flat shape, so as to facilitate crushing and effectively prevent fragments from popping out and injuring workers during crushing.

[0015] 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 drive the upper conveyor belt to move up and down, which can achieve the effect of conveying PE pipes of different diameters; when the diameter of the PE pipe is large, the two first connecting rods can push the sliding frame forward when the fixed frame moves upward, so that the sliding frame can be moved away from the cutting point, and the part of the sliding frame used for pressing the PE pipe is farther away from the cutting point, thereby effectively improving the pressing effect on the PE pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a rear view structural schematic diagram of the present invention; Figure 3It is a schematic diagram of the split structure of the present invention; Figure 4 It is a structural schematic diagram of the conveyor belt in the present invention; Figure 5 It is a structural schematic diagram of the sliding frame in the present invention; Figure 6 It is a schematic diagram of the disassembled structure of the sliding frame in the present invention; Figure 7 It is a structural schematic diagram of the driving mechanism in the present invention; Figure 8 It is a structural schematic diagram of the segmentation mechanism in the present invention; Fig. 9 It is a structural schematic diagram of the pressing mechanism in the present invention.

[0017] 1. Base; 2. PE pipe; 3. Conveyor belt; 4. Fixed frame; 5. Sliding frame; 6. Slide; 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. Driving rod; 25. Bidirectional threaded rod; 26. Driving 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 DESCRIPTION

[0018] See also Figure 1-Figure 9 The present invention provides a technical solution: a PE pipe defective product recycling and reuse device, comprising 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 at the upper and lower sides of the PE pipe 2, and the lower conveyor belt 3 is transmission-connected to the base 1; a fixed frame 4 is arranged on the upper conveyor belt 3 and the upper conveyor belt 3 is transmission-connected to the fixed frame 4; a sliding frame 5 is arranged on the base 1 in front of the PE pipe 2, and slide grooves 6 penetrating the base 1 are symmetrically arranged at the left and right sides of the bottom of the sliding frame 5 on the base 1, and the sliding frame 5 is slidably connected to the two slide grooves 6; The sliding frame 5 is provided with a splitting mechanism, which is used to split the PE pipe 2 along the axial direction; A pressing mechanism is provided inside the sliding frame 5, and the pressing mechanism is used to press the cut parts of the PE pipe 2 into a flat shape; The sliding frame 5 is provided with a crushing mechanism, which is used to crush the PE pipe 2 part pressed into a plane into fragments; During operation, the PE tube 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 tube 2 to move forward. When the PE tube 2 moves, the PE tube 2 can be divided into two parts by the dividing mechanism. At this time, the two divided parts are in the shape of two semi-circular arcs, which are not convenient for crushing. The two semi-circular arc-shaped PE tubes 2 can be pressed into a flat shape by the pressing mechanism; when the two divided parts of the PE tube 2 are pressed flat, the parts can be easily crushed into fragments by the crushing mechanism; the device can cut the PE tube 2 into two parts, and then press the two parts into a flat shape, so as to facilitate crushing and effectively prevent fragments from popping out and injuring the staff during crushing.

[0019] like Figure 4 , Figure 8 As shown, as a further solution of the present invention, the segmentation mechanism includes two cutting knives 7, which 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 sides of the PE pipe 2; a support plate 8 is provided in the sliding frame 5, and the left and right ends of the support plate 8 are symmetrically fixedly connected with first sliders 9, and the two first sliders 9 are both slidably connected to the sliding frame 5; the left and right sides of the support plate 8 are symmetrically slidably connected with expansion plates 10, and the upper and lower sides of the expansion plate 10 are respectively inclined upward and downward; A first motor 11 is fixedly connected to the middle of the support plate 8. The first motor 11 is a dual-axis motor and both left and right ends of the output shaft of the first motor 11 are fixedly connected to first threaded rods 12. The first threaded rods 12 on the left and right sides are rotatably connected to the first sliders 9 on the left and right sides respectively, and the first threaded rods 12 on the left and right sides have opposite screw directions. A telescopic rod 13 is provided between the expansion plate 10 and the cutting knife 7, and the front and rear ends of the telescopic rod 13 are fixedly connected to the expansion plate 10 and the cutting knife 7 respectively; a fixing rod 14 is fixedly connected to the left and right sides of the two cutting knives 7 on the base 1, and a supporting rod 15 is sleeved on the two fixing rods 14, and the two cutting knives 7 are slidably connected to the supporting rod 15; During operation, when the two conveyor belts 3 drive the PE tube 2 to move forward, the left and right sides of the front end of the PE tube 2 will be cut by the two cutting knives 7. Since there is a thickness difference between the blade and the back of the cutting knife 7, the incision of the PE tube 2 will be enlarged by the cutting knife 7; when the front end of the PE tube 2 moves to the position of the expansion plate 10, the rear end of the expansion plate 10 will be directly inside the incision of the PE tube 2. As the PE tube 2 continues to move forward, the upper and lower sides of the PE tube 2 will be squeezed upward and downward by the expansion plate 10, respectively, and the incision of the PE tube 2 will be further enlarged, which is convenient for subsequent flattening; When the diameter of the PE pipe 2 to be crushed is large, the two first sliding blocks 9 are driven to slide upward in the sliding frame 5 to drive the support plate 8 to slide upward, and the support plate 8 drives the two expansion plates 10 to move upward, and the expansion plate 10 drives the cutting knife 7 to move upward through the telescopic rod 13; when the cutting knife 7 moves to the height of the center of the PE pipe 2, the movement of the support plate 8 can be stopped, and the first motor 11 is started at this time, and the first motor 11 drives the first threaded rods 12 on the left and right sides to rotate, and the first threaded rods 12 on the left and right sides respectively drive the expansion plates 10 on the left and right sides to move left and right, and the expansion plate 10 drives the cutting knife 7 to move, and when the cutting knife 7 moves to a position where it fits the wall of the PE pipe 2, the first motor 11 can be stopped.

[0020] like Figure 7-9 As shown, 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 at the upper and lower sides of the support plate 8 and the distance between the two first pressing rollers 16 is smaller than the width of the front part of the expansion plate 10; the first pressing roller 16 is located inside the expansion plate 10 and has a clearance fit with the expansion plate 10; mounting frames 17 are symmetrically provided at the upper and lower sides of the support plate 8, and second pressing rollers 18 are rotatably connected inside the mounting frames 17, and 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 the upper mounting frame 17 is symmetrically fixedly connected to the second sliders 19 at the left and right sides, and the two second sliders 19 are both slidably connected to the sliding frame 5; a driving mechanism is provided on the sliding frame 5, and the driving mechanism is used to drive the first pressing rollers 16 on the upper and lower sides to move upward and downward respectively to positions that fit with the second pressing rollers 18 on the upper and lower sides; The driving mechanism includes a second motor 20, which 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 provided on the first pulley 21, and second pulleys 23 are symmetrically provided on the left and right sides of the first pulley 21, the second pulley 23 is rotatably 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, and the driving rod 24 passes through the first slider 9, the second slider 19 and the bottom side of the sliding frame 5 The first slider 9 is rotatably connected with a bidirectional threaded rod 25, the upper end of the bidirectional threaded rod 25 passes through the second slider 19 and is in clearance with the second slider 19, and the lower end of the bidirectional threaded rod 25 passes through the bottom side of the sliding frame 5 and is in clearance with the bottom side of the sliding frame 5; the driving rod 24 passes through the bidirectional threaded rod 25 and is slidably connected with the bidirectional threaded rod 25; the bidirectional threaded rod 25 is self-locking and the upper and lower sides of the bidirectional threaded rod 25 are threadedly connected with driving blocks 26, and the upper and lower driving blocks 26 are rotatably connected with the first pressing rollers 16 on the upper and lower sides respectively; During operation, when the two cut parts of the PE tube 2 pass through the two expansion plates 10, the expansion plates 10 squeeze the lower two side parts of the PE tube 2 upward and downward respectively, and when the cut part of the upper PE tube 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, and the second motor 20 drives the first pulley 21 to rotate, and the first pulley 21 drives the two second pulleys 23 to rotate through the belt 22, and the second pulley 23 drives the driving rod 24 to rotate, and when the driving rod 24 rotates, it drives the bidirectional threaded rod 25 to rotate, and the bidirectional threaded rod 25 rotates. When the threaded rod 25 rotates, the driving blocks 26 on the upper and lower sides are driven to move upward and downward respectively. At this time, the first pressing roller 16 on the upper side starts to move upward and the first pressing roller 16 on the lower side 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 tube 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 tube 2, the cut part of the PE tube 2 is completely pressed from a semicircular shape to a flat shape; When the diameter of the PE pipe 2 to be crushed is large, the two second sliders 19 are driven to slide upward at the same time to drive the upper mounting frame 17 to move upward, and the upper mounting frame 17 drives the upper second pressing roller 18 to move upward. When the upper pressing roller is just moved to the position above the PE pipe 2, it can be ensured that the cut part of the PE pipe 2 can pass between the first pressing roller 16 and the second pressing roller 18 when moving forward.

[0021] like Fig. 9 As shown, as a further solution of the present invention, the crushing mechanism includes two crushing boxes 27, which are respectively fixedly connected to the mounting frames 17 on the upper and lower sides and are located in front of the second pressing roller 18 in front of the crushing entrance; During operation, when the cut portion of the PE tube 2 flattened by the first pressing roller 16 and the second pressing roller 18 passes over the first pressing roller 16 and the second pressing roller 18, the portion will directly enter the crushing box 27 through the opening of the crushing box 27, and then the crushing box 27 can be started to crush the portion into fragments.

[0022] like Figure 2-3 , Figure 5 As shown, as a further solution 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 fixed 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 cylinders 29 are symmetrically fixedly connected to the front and rear sides of the lifting plate 28, and the cylinders 29 are used to drive the lifting plate 28 to rise and fall; The first connecting rods 30 are symmetrically connected to the left and right sides of the fixed frame 4, and the front ends of the two first connecting rods 30 are both connected to the sliding frame 5. Two second connecting rods 31 are provided on the first slider 9, and the middle parts of the two second connecting rods 31 are both rotatably connected to the first slider 9 and the two second connecting rods 31 are in a cross shape; the upper and lower ends of the second connecting rod 31 are rotatably connected to the third connecting rod 32 and the fourth connecting rod 33 respectively, and the upper ends of the two third connecting rods 32 on the upper side are both rotatably connected to the second slider 19; the bottom ends of the two fourth connecting rods 33 on the lower side are both rotatably connected to the bottom side of the sliding frame 5; During operation, the lifting plate 28 can be driven to rise and fall by starting the two cylinders 29, and the lifting plate 28 drives the upper conveyor belt 3 to rise and fall through the fixed frame 4, so as to achieve the effect of conveying PE pipes 2 of various diameters; since the larger the diameter of the PE pipe 2, the farther the position of pressing the cut part needs to be from the cut point, when it is necessary to crush the PE pipe 2 of a larger diameter, it is necessary to start the cylinder 29 to drive the lifting plate 28 to rise, and the lifting plate 28 drives the fixed frame 4 to move upward, and the fixed frame 4 pushes the sliding frame 5 to slide forward through the two first connecting rods 30, and the sliding frame 5 will move away from the cutting point when sliding forward; 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, and the first slider 9 is always in the middle position of the upper and lower mounting frames 17 during the upward movement; since the upper mounting frame 17 is at the upper end position of the PE pipe 2 and the lower mounting frame 17 is at the bottom end position of the PE pipe 2, no matter how the upper mounting frame 17 moves, the cutting knife 7 can be ensured to be in the center position of the PE pipe 2.

Claims

1. A PE pipe defective product recycling device, 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 provided at upper and lower sides of the PE pipe (2), and the lower conveyor belt (3) is in driving connection with the base (1); a fixed frame (4) is provided on the upper conveyor belt (3), and the upper conveyor belt (3) is in driving connection with the fixed frame (4); a sliding frame (5) is provided on the base (1) in front of the PE pipe (2), and sliding grooves (6) penetrating the base (1) are symmetrically provided at left and right sides of the bottom of the sliding frame (5), and the sliding frame (5) is in sliding connection with the two sliding grooves (6); A splitting mechanism is provided inside the sliding frame (5), and the splitting mechanism is used to split the PE pipe (2) along the axial direction; A pressing mechanism is provided inside the sliding frame (5), and the pressing mechanism is used to press the cut parts of the PE pipe (2) into a flat shape; The sliding frame (5) is provided with a crushing mechanism, and the crushing mechanism is used to crush the portion of the PE pipe (2) pressed into a plane into fragments.

2. According to claim 1, a PE pipe defective product recycling device is characterized by: The splitting mechanism comprises two cutting knives (7), the two cutting knives (7) are symmetrically distributed at left and right sides of the PE tube (2), and the two cutting knives (7) are respectively in contact with the left and right side parts of the PE tube (2); a support plate (8) is provided inside the sliding frame (5), the left and right ends of the support plate (8) are symmetrically fixedly connected with first sliding blocks (9), and the two first sliding blocks (9) are both slidably connected to the sliding frame (5); and expansion plates (10) are symmetrically slidably connected to the left and right sides of the support plate (8), and the upper and lower side parts of the expansion plate (10) are respectively inclined upward and downward.

3. The device for recycling defective PE pipes according to claim 2 is characterized in that: A first motor (11) is fixedly connected to the middle of the support plate (8); the first motor (11) is a dual-axis motor and first threaded rods (12) are fixedly connected to both left and right ends of the output shaft of the first motor (11); the first threaded rods (12) on the left and right sides are rotatably connected to the first sliders (9) on the left and right sides respectively, and the thread directions of the first threaded rods (12) on the left and right sides are opposite.

4. The device for recycling defective PE pipes according to claim 2 is characterized in that: A telescopic rod (13) is provided between the expansion plate (10) and the cutting knife (7), and the front and rear ends of the telescopic 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 two cutting knives (7) on the base (1), and a support rod (15) is sleeved on the two fixed rods (14), and the two cutting knives (7) are slidably connected to the support rod (15).

5. The device for recycling defective PE pipes according to claim 2, characterized in that: The pressing mechanism comprises two first pressing rollers (16), the two first pressing rollers (16) being symmetrically distributed at upper and lower sides of the support plate (8) and the distance between the two first pressing rollers (16) being smaller than the width of the front part of the expansion plate (10); the first pressing roller (16) being located inside the expansion plate (10) and having a clearance fit with the expansion plate (10); mounting frames (17) being symmetrically provided at upper and lower sides of the support plate (8), the second pressing rollers (18) being rotatably connected inside the mounting frames (17), the two first pressing rollers (16) being symmetrically distributed at upper and lower sides of the support plate (8) and the distance between the two first pressing rollers (16) being smaller than the width of the front part of the expansion plate (10); the first pressing rollers (16) being located inside the expansion plate (10) and having a clearance fit with the expansion plate (10); the mounting frames (17) being symmetrically provided with mounting frames (17) at upper and lower sides of the support plate (8), the second pressing rollers (18) being rotatably connected inside the mounting frames (17), the two first The pressing roller (16) and the two second pressing rollers (18) are located on the same vertical plane; the lower mounting frame (17) is fixedly connected to the sliding frame (5) and the upper mounting frame (17) is symmetrically fixedly connected to the left and right sides with second sliding blocks (19), and the two second sliding blocks (19) are both slidably connected to the sliding frame (5); a driving mechanism is provided on the sliding frame (5), and the driving mechanism is used to drive the first pressing rollers (16) on the upper and lower sides to move upward and downward respectively to positions where they fit with the second pressing rollers (18) on the upper and lower sides.

6. The device for recycling defective PE pipes according to claim 5, characterized in that: The driving mechanism comprises 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 to a first pulley (21), the first pulley (21) is provided with a belt (22), and second pulleys (23) are symmetrically provided on the left and right sides of the first pulley (21), the second pulley (23) is rotatably connected to the sliding frame (5), and the belt (22) is simultaneously meshed with the first pulley (21) and the two second pulleys (23); the bottom end of the second pulley (23) is fixedly connected to a driving rod (24), and the driving rod (24) passes through the first slider (9), the second slider (19) and the sliding frame (5). The bottom part; the first slider (9) is rotatably connected to a bidirectional threaded rod (25); the upper end of the bidirectional threaded rod (25) passes through the second slider (19) and is loosely matched with the second slider (19); the lower end of the bidirectional threaded rod (25) passes through the bottom part of the sliding frame (5) and is loosely matched with the bottom part of the sliding frame (5); the driving rod (24) passes through the bidirectional threaded rod (25) and is slidably connected to the bidirectional threaded rod (25); the bidirectional threaded rod (25) is self-locking and the upper and lower parts of the bidirectional threaded rod (25) are threadedly connected to driving blocks (26); the driving blocks (26) on the upper and lower sides are rotatably connected to the first pressing rollers (16) on the upper and lower sides respectively.

7. The device for recycling defective PE pipes according to claim 5, characterized in that: The pulverizing mechanism comprises two pulverizing boxes (27), the two pulverizing boxes (27) being fixedly connected to the mounting frames (17) at the upper and lower sides respectively and being located in front of the second pressing roller (18) in front of the pulverizing entrance.

8. The device for recycling defective PE pipes according to claim 5, characterized in that: A lifting plate (28) is provided above the base (1); a rear end of the lifting plate (28) is fixedly connected to the fixed 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 cylinders (29) are symmetrically fixedly connected to the front and rear sides of the lifting plate (28); the cylinders (29) are used to drive the lifting plate (28) to rise and fall.

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

10. The device for recycling defective PE pipes according to claim 5, characterized in that: The first slider (9) is provided with two second connecting rods (31), 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 cross 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 end parts of the two third connecting rods (32) on the upper side are rotatably connected to the second slider (19); the lower end parts of the two fourth connecting rods (33) on the lower side are rotatably connected to the bottom part of the sliding frame (5).

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