PE pipe cutting device

Abstract

The application discloses a PE pipe cutting equipment and relates to the technical field of pipe cutting. The PE pipe cutting equipment comprises a feeding and withdrawing roller, which is used for cutting and conveying a PE pipe. An outer cylinder is arranged on a conveying path of the PE pipe. An inner cylinder is arranged in the outer cylinder, and a cutting channel for cutting the PE pipe is formed between the outer cylinder and the inner cylinder. A V-shaped cutting track is formed in the cutting channel. A pipe cutting knife is arranged in the two groups of tracks of the V-shaped cutting track and is used for cutting the PE pipe. A pre-tightening assembly is arranged on a cutting path of the pipe cutting knife. The pre-tightening assembly is used for pre-tightening deformation of the PE pipe during cutting in response to cutting movement of the pipe cutting knife. Through arrangement of the pre-tightening assembly, the pipe cutting knife can apply a counter thrust to the PE pipe cutout when cutting the PE pipe, the cutout deformation caused by stress release during cutting of the PE pipe is overcome, the flatness and consistency of the cutout during cutting of the PE pipe are maintained, and the cutting precision is improved.

Description

Technical Field

[0001] This invention relates to the field of pipe cutting technology, specifically to a PE pipe cutting device. Background Technology

[0002] To enhance the corrosion and wear resistance of steel pipes, a special material is needed to isolate the transported medium from the steel pipe on its inner wall, preventing the medium from contacting the pipe. PE pipes with excellent corrosion resistance are typically chosen as the inner lining of the steel pipe. When pulling the PE lining into the inner diameter of the steel pipe, the end of the PE lining usually needs to be cut to facilitate subsequent clamp installation. With the development and improvement of industrialization, the traditional method of manually cutting pipes with electric saws is gradually failing to meet the needs of standardized and industrialized production, and mechanical cutting has gradually become the mainstream method.

[0003] For example, Chinese patent CN117103365B discloses an anti-loosening cutting device for PE pipe production. In this type of device, a positioning and rotating assembly is provided. A rotating motor drives a rotating rod to rotate, which in turn drives a drive gear on the outer surface to rotate. As the drive gear rotates, the positioning column rotates under the action of the driven gear, thereby driving the PE pipe to rotate. Rotating while cutting can prevent the PE pipe from being squeezed and damaged during the cutting process. On the other hand, the rotational cutting can improve the cutting efficiency and flatness.

[0004] During the cutting process of PE pipes, because PE pipes are typical viscoelastic materials, and during the extrusion molding and cooling process, residual stress will be generated inside the pipe due to uneven cooling and molecular orientation, so it has obvious stress release characteristics. At this time, when directly used for cutting PE pipes, the cutting path often tends to "tear" due to stress release, which makes it difficult to maintain the same cutting plane, resulting in insufficient flatness of the cut and reduced cutting accuracy. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a PE pipe cutting device, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a PE pipe cutting device, comprising: at least one set of feeding and unloading rollers for feeding and cutting PE pipes; an outer cylinder disposed on the conveying path of the PE pipe, the outer cylinder having an inner cylinder inside, and a cutting channel for cutting the PE pipe formed between the outer cylinder and the inner cylinder, wherein a V-shaped cutting track is formed inside the cutting channel; two sets of pipe cutters, respectively located within the two sets of tracks of the V-shaped cutting track, the two sets of pipe cutters being able to move along the V-shaped cutting track to the top of the V, acting on the cut of the PE pipe; and a pre-tightening assembly disposed on the cutting path of the pipe cutter, the pre-tightening assembly responding to the cutting movement of the pipe cutter and acting on the deformation pre-tightening during the cutting process of the PE pipe.

[0007] Furthermore, the pre-tightening assembly includes: a first rotating sleeve, sleeved on the outside of the outer cylinder and moving synchronously with the pipe cutter; the first rotating sleeve has a first helical track formed axially; a first sliding buckle, located at one end of the outer cylinder and within the track of the first helical track, allowing the first helical track to passively slide along the first sliding buckle, generating a rotational drive acting on the first rotating sleeve during its movement; a first helical plate, located at one end of the first rotating sleeve and penetrating the outer cylinder to make frictional contact with the outer PE pipe; the outer cylinder has a first clearance helix formed axially, providing the track required for the helical movement of the first helical plate.

[0008] Furthermore, the pre-tightening assembly further includes: a second rotating sleeve, fitted inside the inner cylinder and moving synchronously with the pipe cutter; the second rotating sleeve having a second helical track formed axially; a second sliding buckle, located at one end of the inner cylinder and within the track of the second helical track, allowing the second helical track to passively slide along the second sliding buckle, generating a rotational drive acting on the movement of the second rotating sleeve; and a second helical plate, located at one end of the second rotating sleeve and penetrating the inner cylinder to make frictional contact with the inner tube of the PE pipe; the inner cylinder having a second clearance helix formed axially, providing the track required for the helical movement of the second helical plate.

[0009] Furthermore, the first and second spiral tracks are arranged in opposite directions, generating opposing spiral motions acting on the first and second spiral plates. The spiral motions of the first and second spiral plates proceed in parallel, forming opposing cross spiral motions that act on the PE pipe cutting path.

[0010] Furthermore, the pre-tightening assembly also includes: a first track, which is separately arranged on both sides of the V-shaped cutting track, wherein the first track is arranged symmetrically in pairs on the outer cylinder, and a first push plate is slidably installed inside the first track. The first push plate is in frictional contact with the outer PE pipe, and a first wedge block is provided at the bottom end of the first push plate; a first push handle is located on one side of the first wedge block and moves synchronously with the pipe cutter. A first wedge platform is formed on the first push handle to act on the movement of the first wedge block, generating a driving force to drive the first push plate to move toward the V-shaped cutting track.

[0011] Furthermore, the pre-tightening assembly also includes: a second track, which is separately arranged on both sides of the V-shaped cutting track, wherein the second track is arranged symmetrically in pairs on the inner cylinder, and a second push plate is slidably installed inside the second track. The second push plate is in frictional contact with the inner tube of the PE pipe, and a second wedge block is provided at the bottom end of the second push plate; a second push handle is located on one side of the second wedge block and moves synchronously with the pipe cutter. A second wedge platform is formed on the second push handle to act on the movement of the second wedge block, generating a driving force to drive the second push plate to move towards the V-shaped cutting track.

[0012] Furthermore, the first track is provided with a first guide rod inside to guide the movement of the first push plate, and a first spring is sleeved at the bottom end of the first guide rod to allow the first push plate to reset after movement; the second track is provided with a second guide rod inside to guide the movement of the second push plate, and a second spring is sleeved at the bottom end of the second guide rod to allow the second push plate to reset after movement.

[0013] Furthermore, it also includes a boom frame located on the moving path of the pipe cutter, wherein the boom frame has two sets of track grooves and is slidably connected to guide wheels located on the two sets of pipe cutters, thereby generating a driving force that acts on the two sets of pipe cutters to move along the V-shaped cutting track.

[0014] Furthermore, the V-shaped cutting track includes cutting channels that extend into the interior of both the outer and inner cylinders.

[0015] Furthermore, a rotating clamping assembly is provided on the conveying path of the PE pipe for rotational adjustment when the PE pipe is cut. The rotating clamping assembly includes: a rotating platform arranged on the conveying path of the PE pipe; and at least one second hydraulic push rod arranged around the rotation path of the rotating platform. The telescopic end of the second hydraulic push rod is provided with a clamping sleeve that acts on the PE pipe.

[0016] The present invention has the following beneficial effects:

[0017] (1) The PE pipe cutting equipment, through the setting of the pre-tightening component, enables the pipe cutter to apply a counter-thrust to the PE pipe cut when cutting the PE pipe, overcomes the deformation of the cut caused by stress release during PE pipe cutting, maintains the flatness and consistency of the cut during PE pipe cutting, and improves the cutting accuracy.

[0018] (2) The PE pipe cutting equipment has good integrated transmission characteristics through the synchronous movement of the pre-tightening component with the pipe cutting knife, which makes the PE pipe cutting smoother and more stable. On the other hand, it has the real-time deformation pre-tightening capability of the PE pipe cutting path, so that its deformation pre-tightening force is applied to the PE pipe cutting part in real time, and the cutting accuracy and flatness can be fully guaranteed, reducing the subsequent trimming process.

[0019] (3) When the PE pipe cutting equipment cuts the PE pipe, the cutting path of the PE pipe is limited by the cooperation of the inner and outer cylinders. Furthermore, the cooperation of the inner and outer cylinders can form the track required for the pipe cutter to cut, so that the cutting force deformation of the pipe cutter is smaller when cutting. At the same time, the real-time deformation pre-tightening of the inner and outer pipes of the PE pipe by the pre-tightening component can further improve the cutting stability of the PE pipe and reduce the deformation caused by the cutting force during the cutting process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the first structure of the pre-tightening component in Embodiment 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the second structure of the pre-tightening component in Embodiment 1 of the present invention;

[0024] Figure 5 This is a schematic diagram of the first cutting state in Embodiment 1 of the present invention;

[0025] Figure 6 This is a schematic diagram of the second cutting state in Embodiment 1 of the present invention;

[0026] Figure 7 This is a schematic diagram of the assembly of the inner and outer cylinders in Embodiment 1 of the present invention;

[0027] Figure 8 This is a first exploded view of the inner and outer cylinders in Embodiment 1 of the present invention;

[0028] Figure 9 This is a second exploded view of the inner and outer cylinders in Embodiment 1 of the present invention;

[0029] Figure 10 This is a schematic diagram of the drive mechanism for the pipe cutter in Embodiment 1 of the present invention;

[0030] Figure 11 a, b, and c are, in turn, diagrams showing the changes in the cutting state of the pipe cutter in Embodiment 1 of the present invention;

[0031] Figure 12 This is a schematic diagram of the first assembly of the first rotating sleeve and the outer cylinder in Embodiment 1 of the present invention;

[0032] Figure 13 This is a schematic diagram of the second assembly of the first rotating sleeve and the outer cylinder in Embodiment 1 of the present invention;

[0033] Figure 14 This is a first exploded view of the first rotating sleeve and the outer cylinder in Embodiment 1 of the present invention;

[0034] Figure 15 This is a second exploded view of the first rotating sleeve and the outer cylinder in Embodiment 1 of the present invention;

[0035] Figure 16 This is a schematic diagram of the assembly of the second rotating sleeve and the inner cylinder in Embodiment 1 of the present invention;

[0036] Figure 17 This is an exploded view of the second rotating sleeve and the inner cylinder in Embodiment 1 of the present invention;

[0037] Figure 18 This is a schematic diagram of the first structure of the pre-tightening component in Embodiment 2 of the present invention;

[0038] Figure 19 This is a schematic diagram of the second structure of the pre-tightening component in Embodiment 2 of the present invention;

[0039] Figure 20 This is a schematic diagram of the assembly of the inner and outer cylinders in Embodiment 2 of the present invention;

[0040] Figure 21 This is a first exploded view of the inner and outer cylinders in Embodiment 2 of the present invention;

[0041] Figure 22 This is a second exploded view of the inner and outer cylinders in Embodiment 2 of the present invention;

[0042] Figure 23 This is a schematic diagram of the assembly of the first push plate and the outer cylinder in Embodiment 2 of the present invention;

[0043] Figure 24 This is a schematic diagram of the assembly of the second pusher plate and the inner cylinder in Embodiment 2 of the present invention;

[0044] Figure 25 This is a schematic diagram of the force driving of the first push plate and the second push plate in Embodiment 2 of the present invention;

[0045] Figure 26 This is a schematic diagram of the rotating clamping assembly in this invention;

[0046] Figure 27 This is a partial cross-sectional view of the rotating clamping assembly in this invention.

[0047] In the diagram, 1. Feeding / unloading roller; 2. Loading bracket; 3. Rotary table; 4. Support frame; 5. Support arm; 6. Fixed base; 7. Outer cylinder; 8. Inner cylinder; 9. Cutting channel; 10. First hydraulic push rod; 11. Arm support frame; 12. First bushing; 13. First rotating sleeve; 14. Pipe cutter; 15. Guide wheel; 16. Track groove; 17. First clearance screw; 18. First sliding buckle; 19. Cutting channel; 20. Second clearance screw; 21. Second sliding buckle; 22. First spiral plate; 23. First spiral track; 24. Second rotating sleeve; 25. Second... 26. Bushing; 27. Second spiral track; 28. Second spiral plate; 29. ​​First track; 30. First push plate; 31. First push handle; 32. Second push handle; 33. First wedge block; 34. Second track; 35. Second push plate; 36. Second wedge block; 37. First guide rod; 38. First spring; 39. Second guide rod; 40. Second wedge platform; 41. Second wedge platform; 42. Clamping platform; 43. Bracket; 44. Second hydraulic push rod; 45. Clamping sleeve; 46. Motor; 47. Drive gear; 48. Driven gear ring. Detailed Implementation

[0048] The following is based on Figures 1-27 This invention describes a PE pipe cutting device provided in an embodiment of the present invention.

[0049] Example 1, as Figures 1-11 , Figures 26-27 As shown, a PE pipe cutting device includes feed and unfeed rollers 1 arranged in a split configuration, which act on the cutting and conveying of PE pipes. An outer cylinder 7 is provided on the conveying path of the PE pipe, and an inner cylinder 8 is provided inside the outer cylinder 7. A cutting channel 9 for cutting the PE pipe is formed between the outer cylinder 7 and the inner cylinder 8. The cutting channel 9 has a V-shaped cutting track, and two sets of pipe cutters 14 are slidably arranged in the two sets of tracks of the V-shaped cutting track. The two sets of pipe cutters 14 can move along the V-shaped cutting track to the top of the V, and act on the cut of the PE pipe. The feed and unfeed rollers 1 act on the conveying of the PE pipe, and the end of the PE pipe is conveyed into the cutting channel 9, so that the PE pipe is in the track of the V-shaped cutting track. Then, the two sets of pipe cutters 14 move along the V-shaped cutting track and move until they coincide with the top of the V of the V-shaped cutting track, and the PE pipe in the cutting channel 9 is cut (e.g., ...). Figures 5-6 (As shown).

[0050] As a further embodiment of this invention, Figures 3-4 , Figures 10-11As shown, a support frame 4 is provided on one side of the moving path of the pipe cutter 14, and first hydraulic push rods 10 are provided on both sides of the support frame 4. A boom frame 11 is provided at the telescopic end of the first hydraulic push rod 10. The boom frame 11 has two sets of track grooves 16, which are slidably connected to guide wheels 15 on the two sets of pipe cutters 14, generating a driving force that propels the two sets of pipe cutters 14 to move along the V-shaped cutting track. By utilizing the telescopic drive of the first hydraulic push rods 10, the boom frame 11 is pushed to move. The cooperation between the track grooves 16 and the guide wheels 15 generates a driving force that propels the pipe cutters 14 to move along the V-shaped cutting track, driving the two sets of pipe cutters 14 to move in a V-shaped motion state (e.g., ...). Figure 11 The diagram shows the state changes of the pipe cutter 14 in states a, b, and c, which is used for the cutting process of PE pipes.

[0051] Furthermore, such as Figures 26-27 As shown, a rotary clamping assembly is also provided on the conveying path of the PE pipe for rotational adjustment during PE pipe cutting. The rotary clamping assembly includes a rotary table 3 arranged on the PE pipe conveying path. A clamping platform 42 is rotatably mounted on one side of the rotary table 3, and a motor 46 is provided on the other side of the rotary table 3. The output shaft of the motor 46 is equipped with a drive gear 47. A driven gear ring 48 meshing with the drive gear 47 is provided on one side of the clamping platform 42. Furthermore, multiple sets of second hydraulic push rods 44 are provided on the clamping platform 42 around the rotation path of the rotary table 3. The clamping platform 42 is equipped with a... A bracket 43 is fixed to the second hydraulic push rod 44, and a clamping sleeve 45 acting on the PE pipe is provided at the telescopic end of the second hydraulic push rod 44. After the PE pipe is transported into the cutting channel 9, the clamping sleeve 45 is pushed to move towards the PE pipe by the telescopic drive of the second hydraulic push rod 44, clamping and fixing the PE pipe to improve the stability of the PE pipe during cutting. After the PE pipe is cut, the motor 46 drives the driving gear 47 and the driven gear ring 48 to generate a rotational driving force acting on the clamping table 42, pushing the PE pipe to rotate for the next set of cutting processes. It should be noted that by using the outer cylinder 7 and the inner cylinder 8 to limit the cutting part of the PE pipe, when the next set of cutting parts is rotated and adjusted, the PE pipe waste after cutting is still retained at the original cutting part, maintaining the consistency of the overall structure of the PE pipe end during the cutting process, reducing cutting deformation, and the cutting waste can be removed when the cutting is completely finished. In addition to the above, such as Figures 7-9 As shown, the outer cylinder 7 and the inner cylinder 8 are integrally fixed together by the fixing seat 6 to form the cutting channel 9 required for PE pipe cutting. The fixing seat 6 is fixed to the support frame 4 by the support arm 5, providing the support platform required for fixing the outer cylinder 7 and the inner cylinder 8. In addition, the fixing seat 6 can also limit the length of the cutting channel 9, so that the PE pipe stops conveying when it comes into contact with the fixing seat 6, forming the cutting entrance of the V-shaped cutting track.

[0052] Furthermore, the V-shaped cutting track includes a cutting channel 19, which extends into the interior of the outer cylinder 7 and the inner cylinder 8 respectively. By extending the cutting channel 19 into the outer cylinder 7 and the inner cylinder 8 respectively, on the one hand, the cutting height of the pipe cutter 14 is higher than that of the cutting channel 9, providing a cutting height margin to ensure the completeness of the PE pipe wall cutting. On the other hand, it also provides a limiting track, so that the cutting movement of the pipe cutter 14 is more stable during the cutting process due to the limiting support of the outer cylinder 7 and the inner cylinder 8.

[0053] like Figures 3-4 , Figures 12-17 As shown, a pre-tightening component is provided on the cutting path of the pipe cutter 14. The pre-tightening component responds to the cutting movement of the pipe cutter 14 and acts on the front side of the cutting path during the PE pipe cutting process. When the pipe cutter 14 acts on the PE pipe to cut, by applying a deformation pre-tightening force on the front side of the PE pipe cutting, the part of the PE pipe to be cut always maintains its original state, avoiding stress release of the cut part, which would cause deformation of the part to be cut and reduce the cutting accuracy.

[0054] like Figures 12-15As shown, the pre-tightening assembly includes a first rotating sleeve 13 sleeved on the outside of the outer cylinder 7. A first bushing 12 is rotatably mounted on one end of the first rotating sleeve 13, and the first bushing 12 is connected to the arm frame 11. When the arm frame 11 moves the pipe cutter 14, it pushes the first rotating sleeve 13 to move synchronously (because the first bushing 12 and the first rotating sleeve 13 are rotatably mounted, the first rotating sleeve 13 can also rotate relative to the first bushing 12 when it moves). A first helical track 23 is formed axially on the first rotating sleeve 13. Furthermore, a first sliding buckle 18 is provided at one end of the outer cylinder 7. The sliding buckle 18 is located inside the track of the first spiral track 23, allowing the first spiral track 23 to passively slide along the first sliding buckle 18, generating a rotational drive that acts on the first rotating sleeve 13 during its movement. When the arm frame 11 pushes the first bushing 12 to move, the driving force is transmitted to the first rotating sleeve 13, pushing the first rotating sleeve 13 to move synchronously with the pipe cutter 14. During the forward movement of the first rotating sleeve 13, the first spiral track 23 inside slides along the first sliding buckle 18, converting linear motion into rotational motion, so that the first rotating sleeve 13 maintains rotational motion while moving forward. Meanwhile, one end of the first rotating sleeve 13 is also provided with a first spiral plate 22, which passes through the outer cylinder 7 and makes frictional contact with the outer PE pipe. The outer cylinder 7 forms a first relief spiral 17 in the axial direction (the spiral trajectory of the first relief spiral 17, the first spiral track 23, and the first spiral plate 22 are the same, so that when the first spiral track 23 moves passively along the first sliding buckle 18, the first spiral plate 22 can move synchronously along the first relief spiral 17. Moreover, the first relief spiral 17 only provides the track for the spiral movement of the first spiral plate 22, and there is no force between the two). It provides the track required for the spiral movement of the first spiral plate 22. During the rotation of the first rotating sleeve 13 along the outer cylinder 7, it drives the first spiral plate 22 to move synchronously around the first relief spiral 17. During the spiral rotation of the first spiral plate 22, a frictional thrust that tends towards the cut is applied to the side of the PE pipe to be cut, so as to avoid the stress release of the cut part and drive the part to be cut to deform.

[0055] like Figures 16-17As shown, the pre-tightening assembly also includes a second rotating sleeve 24 sleeved inside the inner cylinder 8. A second bushing 25 is rotatably mounted on one end of the second rotating sleeve 24, and the second bushing 25 is connected to the arm frame 11. When the arm frame 11 moves the pipe cutter 14, it pushes the second rotating sleeve 24 to move synchronously (because the second bushing 25 and the second rotating sleeve 24 are rotatably mounted, the second rotating sleeve 24 can also rotate relative to the second bushing 25 when it moves). A second helical track 26 is formed axially on the second rotating sleeve 24, and a second sliding buckle 21 is also provided at one end of the inner cylinder 8. Located within the second spiral track 26, the second spiral track 26 can passively slide along the second sliding buckle 21, generating a rotational drive that acts on the second rotating sleeve 24 during its movement. When the arm frame 11 pushes the second bushing 25 to move, the driving force is transmitted to the second rotating sleeve 24, pushing the second rotating sleeve 24 to move synchronously with the pipe cutter 14. During the forward movement of the second rotating sleeve 24, the second spiral track 26 inside slides along the second sliding buckle 21, converting linear motion into rotational motion, so that the second rotating sleeve 24 maintains rotational motion while moving forward.

[0056] Meanwhile, a second spiral plate 27 is provided at one end of the second rotating sleeve 24, and it passes through the inner cylinder 8 and makes frictional contact with the inner tube of the PE pipe. The inner cylinder 8 forms a second relief spiral 20 in the axial direction (the spiral trajectory of the second relief spiral 20, the second spiral track 26, and the second spiral plate 27 is the same, so that when the second spiral track 26 moves passively along the second sliding buckle 21, the second spiral plate 27 can move synchronously along the second relief spiral 20. Moreover, the second relief spiral 20 only provides the track for the spiral movement of the second spiral plate 27, and there is no force interaction between the two). It provides the track required for the spiral movement of the second spiral plate 27. During the rotation of the second rotating sleeve 24 along the inner cylinder 8, it drives the second spiral plate 27 to move synchronously around the second relief spiral 20. During the spiral rotation of the second spiral plate 27, a frictional thrust that tends towards the cut is applied to the other side of the PE pipe to be cut, so as to avoid the stress release of the cut part and drive the part to be cut to deform.

[0057] It should be noted that the first spiral track 23 and the second spiral track 26 are arranged in opposite directions, generating opposing spiral motions acting on the first spiral plate 22 and the second spiral plate 27. The spiral motions of the first spiral plate 22 and the second spiral plate 27 are "parallel," forming opposing cross spiral motions that act on the PE pipe cutting path. By arranging the first spiral track 23 and the second spiral track 26 in opposite directions, the spiral motions of the first spiral plate 22 and the second spiral plate 27 are kept in a relative operating state. Furthermore, by setting the first spiral plate 22 and the second spiral plate 27 to be flush with each other, the spiral motions between them are always kept in a cross spiral motion state. Then, by placing the first spiral plate 22 and the second spiral plate 27 in front of the cutting path of the pipe cutter 14, opposing frictional thrust is applied to the front of the PE pipe cutting path, maintaining the original state of the part of the PE pipe to be cut, avoiding stress release of the already cut part, which would affect the part to be cut, and ensuring cutting consistency.

[0058] During use (operation), when cutting the end of the PE pipe, the PE pipe to be cut is guided to the feed roller 1 by the feeding bracket 2. The feed roller 1 pushes the end of the PE pipe into the cutting channel 9. At this time, the PE pipe is fixed by the clamping of the rotating clamping assembly. Then, the first hydraulic push rod 10 drives the driving force to be transmitted to the two sets of pipe cutters 14 through the arm frame 11, so that the two sets of pipe cutters 14 move along the V-shaped cutting track and move to the V-shaped cutting track. The V-shaped top acts on the cutting process of the PE pipe end; while cutting the PE pipe, the arm force frame 11 drives the first rotating sleeve 13 through the first bushing 12, pushing the first rotating sleeve 13 to move with the pipe cutting knife 14. At the same time, with the cooperation of the first spiral track 23 and the first sliding buckle 18, the first rotating sleeve 13 is pushed to move and rotate synchronously, so that the first spiral plate 22 inside it applies a frictional thrust towards the cutting part of the outer part of the PE pipe in a spiral motion. Similarly, the drive of the arm lever 11 is transmitted to the second rotating sleeve 24 through the second bushing 25, pushing the second rotating sleeve 24 to move with the pipe cutter 14. Simultaneously, the second rotating sleeve 24 rotates synchronously with the second spiral track 26 and the second sliding buckle 21, causing the second spiral plate 27 inside to apply a frictional thrust towards the cut on the other side of the PE pipe's inner tube in a spiral motion. This causes the first spiral plate 22 and the second spiral plate 27 to move in a spiral, intersecting motion. In this state, opposing frictional thrust is applied to the front side of the PE pipe cutting path to maintain the original state of the PE pipe to be cut, and to avoid stress release of the already cut part, which would affect the cutting part; after the PE pipe cutting is completed, the pipe cutting knife 14 is controlled to retract and the first spiral plate 22 and the second spiral plate 27 are reset. At this time, the rotation drive of the rotary clamping assembly is used to adjust the next set of cutting parts of the PE pipe and perform the next set of cutting process. After the PE pipe cutting is completed, the PE pipe is pushed out by the feeding and unloading roller 1 to complete the cutting process.

[0059] Example 2, as Figures 18-25 As shown, unlike Embodiment 1, the pre-tightening component performs synchronous deformation pre-tightening on both the cut and uncut parts of the PE pipe, applying opposing frictional thrust to the inner and outer sides of the PE pipe cutting path, reducing stress release and causing the cut to tend towards "tearing" deformation.

[0060] like Figures 18-22 , Figure 25As shown, the pre-tightening assembly includes a first track 28 arranged separately on both sides of the V-shaped cutting track. The first tracks 28 are symmetrically arranged in pairs on the outer cylinder 7. A first push plate 29 is slidably installed inside the first track 28, and the first push plate 29 is in frictional contact with the outer PE pipe. A first wedge block 32 is provided at the bottom end of the first push plate 29, and a first push handle 30 is provided on one side of the first wedge block 32. The first push handle 30 is connected to the arm lever 11, so that while the arm lever 11 pushes the pipe cutter 14 to cut and move, it simultaneously pushes the first push handle 30 to move synchronously. A first wedge platform 40 is formed on the 30, which acts on the movement of the first wedge block 32, generating a driving force to drive the first push plate 29 to move towards the V-shaped cutting track. While the arm frame 11 pushes the first push handle 30 forward, the first wedge platform 40 and the first wedge block 32 are in sequence abutted against each other, generating a thrust on the first push plate 29 in sequence, causing the first push plate 29 to move to both sides of the V-shaped cutting track, applying opposing frictional thrust to the cut part of the PE outer tube, and pre-tightening the cut parts of the cut and uncut parts to avoid stress release during cutting affecting the uncut parts.

[0061] like Figures 18-22 , Figure 25 As shown, the pre-tightening assembly also includes second tracks 33 arranged separately on both sides of the V-shaped cutting track. The second tracks 33 are symmetrically arranged in pairs on the inner cylinder 8. A second push plate 34 is slidably installed inside the second track 33, and the second push plate 34 is in frictional contact with the inner PE pipe. A second wedge block 35 is provided at the bottom end of the second push plate 34, and a second push handle 31 is provided on one side of the second wedge block 35. The second push handle 31 is connected to the arm lever 11, so that while the arm lever 11 pushes the pipe cutter 14 to cut and move, it simultaneously pushes the second push handle 31 to move synchronously. A second wedge-shaped platform 41 is formed on the handle 31, which acts on the movement of the second wedge block 35, generating a driving force to drive the second push plate 34 to move towards the V-shaped cutting track. Simultaneously, as the arm arm 11 pushes the second push handle 31 forward, the second wedge-shaped platform 41 sequentially abuts against the second wedge block 35, generating a thrust on the second push plate 34. This causes the second push plate 34 to move towards both sides of the V-shaped cutting track, applying opposing frictional thrust to the cut portion of the PE inner pipe. This pre-tightens the cut portions of both the cut and uncut areas, preventing stress release during cutting from affecting the uncut portions. It should be noted that the first push plate 29 and the second push plate 34 are arranged in the same trajectory to apply synchronous opposing frictional thrust to the inner and outer cut portions of the PE pipe.

[0062] like Figures 23-24As shown, the first track 28 has a first guide rod 36 inside to guide the movement of the first push plate 29, and a first spring 37 is sleeved at the bottom end of the first guide rod 36 to allow the first push plate 29 to reset after movement. The second track 33 has a second guide rod 38 inside to guide the movement of the second push plate 34, and a second spring 39 is sleeved at the bottom end of the second guide rod 38 to allow the second push plate 34 to reset after movement. When the second push handle 31 moves in the reverse direction to reset, the first guide rod 36 and the first spring 37 cooperate to reset the first push plate 29 after movement, preparing for the next movement of the first push plate 29. Similarly, when the second push handle 31 moves in the reverse direction to reset, the second guide rod 38 and the second spring 39 cooperate to reset the second push plate 34 after movement, preparing for the next movement of the second push plate 34.

Claims

1. A PE pipe cutting device, characterized in that, include: Feeding and unloading rollers (1) are provided with at least one set, which are used for cutting and conveying PE pipes; The outer cylinder (7) is located on the conveying path of the PE pipe. The inner cylinder (8) is provided inside the outer cylinder (7), and a cutting channel (9) for cutting the PE pipe is formed between the outer cylinder (7) and the inner cylinder (8). A V-shaped cutting track is formed inside the cutting channel (9). The pipe cutter (14) is provided in two sets, which are located in the two sets of tracks of the V-shaped cutting track respectively. The two sets of pipe cutters (14) can move along the V-shaped cutting track to the top of the V and act on the cut of the PE pipe. The pre-tightening component is located on the cutting path of the pipe cutter (14). The pre-tightening component responds to the cutting movement of the pipe cutter (14) and acts on the deformation pre-tightening during the PE pipe cutting process. The pretensioning component includes: The first rotating sleeve (13) is sleeved on the outside of the outer cylinder (7) and moves synchronously with the pipe cutter (14). The first rotating sleeve (13) has a first spiral track (23) formed in the axial direction. The first sliding buckle (18) is located at one end of the outer cylinder (7) and within the track of the first spiral track (23), so that the first spiral track (23) can slide passively along the first sliding buckle (18) to generate a rotation drive that acts on the first rotating sleeve (13) during its movement. The first spiral plate (22) is located at one end of the first rotating sleeve (13) and passes through the outer cylinder (7) to make frictional contact with the outer PE pipe. The outer cylinder (7) has a first clearance helix (17) formed axially, providing the track required for the helical movement of the first helical plate (22); The pretensioning assembly also includes: The second rotating sleeve (24) is fitted inside the inner cylinder (8) and moves synchronously with the pipe cutter (14). The second rotating sleeve (24) has a second spiral track (26) formed in the axial direction. The second sliding buckle (21) is located at one end of the inner cylinder (8) and within the track of the second spiral track (26), so that the second spiral track (26) can slide passively along the second sliding buckle (21) to generate a rotation drive that acts on the second rotating sleeve (24) during its movement. The second spiral plate (27) is located at one end of the second rotating sleeve (24) and passes through the inner cylinder (8) to make frictional contact with the inner tube of the PE pipe; The inner cylinder (8) has a second clearance helix (20) formed axially, providing the track required for the spiral movement of the second spiral plate (27); The first spiral track (23) and the second spiral track (26) are arranged opposite to each other, generating opposing spiral motions acting on the first spiral plate (22) and the second spiral plate (27), and the spiral motions of the first spiral plate (22) and the second spiral plate (27) are "parallel", forming opposing cross spiral motions that act on the PE pipe cutting path.

2. A PE pipe cutting device, characterized in that, include: Feeding and unloading rollers (1) are provided with at least one set, which are used for cutting and conveying PE pipes; The outer cylinder (7) is located on the conveying path of the PE pipe. The inner cylinder (8) is provided inside the outer cylinder (7), and a cutting channel (9) for cutting the PE pipe is formed between the outer cylinder (7) and the inner cylinder (8). A V-shaped cutting track is formed inside the cutting channel (9). The pipe cutter (14) is provided in two sets, which are located in the two sets of tracks of the V-shaped cutting track respectively. The two sets of pipe cutters (14) can move along the V-shaped cutting track to the top of the V and act on the cut of the PE pipe. The pre-tightening assembly is located on the cutting path of the pipe cutter (14). The pre-tightening assembly responds to the cutting movement of the pipe cutter (14) and acts to pre-tighten the deformation during the PE pipe cutting process. The pretensioning assembly also includes: The first track (28) is arranged in a split manner on both sides of the V-shaped cutting track. The first track (28) is arranged in a symmetrical manner on the outer cylinder (7). The first push plate (29) is slidably installed inside the first track (28). The first push plate (29) is in frictional contact with the outer pipe of the PE pipe, and the bottom end of the first push plate (29) is provided with a first wedge block (32). The first push handle (30) is located on one side of the first wedge block (32) and moves synchronously with the pipe cutter (14). A first wedge platform (40) is formed on the first push handle (30) to act on the movement of the first wedge block (32), generating a driving force to drive the first push plate (29) to move toward the V-shaped cutting track; The pretensioning assembly also includes: The second track (33) is arranged in a split manner on both sides of the V-shaped cutting track. The second track (33) is arranged in a symmetrical manner on the inner cylinder (8). The second push plate (34) is slidably installed inside the second track (33). The second push plate (34) is in frictional contact with the inner tube of the PE pipe, and the bottom end of the second push plate (34) is provided with a second wedge block (35). The second push handle (31) is located on one side of the second wedge block (35) and moves synchronously with the pipe cutter (14). A second wedge platform (41) is formed on the second push handle (31) to act on the movement of the second wedge block (35), generating a driving force to drive the second push plate (34) to move toward the V-shaped cutting track; The first track (28) is provided with a first guide rod (36) to guide the movement of the first push plate (29), and a first spring (37) is provided at the bottom end of the first guide rod (36) to allow the first push plate (29) to reset after movement. The second track (33) is provided with a second guide rod (38) inside to guide the movement of the second push plate (34), and a second spring (39) is sleeved at the bottom end of the second guide rod (38) to allow the second push plate (34) to reset after movement.

3. A PE pipe cutting device according to claim 1 or 2, characterized in that, It also includes a lever arm (11) on the moving path of the pipe cutter (14), wherein the lever arm (11) has two sets of track grooves (16) and is slidably connected to the guide wheels (15) on the two sets of pipe cutters (14) respectively, generating a driving force that acts on the two sets of pipe cutters (14) to move along the V-shaped cutting track.

4. A PE pipe cutting device according to claim 1 or 2, characterized in that, The V-shaped cutting track includes a cutting channel (19), which extends into the interior of the outer cylinder (7) and the inner cylinder (8), respectively.

5. A PE pipe cutting device according to claim 1 or 2, characterized in that, The PE pipe is also provided with a rotary clamping assembly along its conveying path for rotational adjustment when the PE pipe is cut. The rotary clamping assembly includes: A rotating table (3) is placed on the conveying path of the PE pipe; The second hydraulic push rod (44) has at least one set of rotation paths around the rotary table (3), and the telescopic end of the second hydraulic push rod (44) is provided with a clamping sleeve (45) that acts on the PE pipe.

Images