Power mpp cable pipe ring cutting device

Abstract

This invention relates to the field of pipe cutting equipment technology, and discloses a circumferential cutting device for power MPP cable conduits. The device includes a frame, a lower support roller frame movably mounted on the frame, a cylinder seat rotatably mounted inside the frame, a hydraulic cylinder fixedly mounted on the cylinder seat, and a U-shaped swing beam rotatably mounted inside the frame above the hydraulic cylinder. A base is fixedly mounted at one end of the U-shaped swing beam, and a pressure block is fixedly mounted at the other end. An axial tension compensation positioning mechanism, including a carrier plate, is movably mounted on one side of the frame. The circumferential tension compensation positioning mechanism, with its multi-stage tension and compression springs with varying stiffness coefficients, achieves segmented downward pressure. During operation, the positioning roller first rolls and presses down on the second separated pipe segment, thereby restraining its downward deviation caused by its own weight and preventing chipping or partial breakage of the cut due to additional shearing action.

Description

Technical Field

[0001] This invention relates to the field of pipe cutting equipment technology, and in particular to a circumferential cutting device for power MPP cable pipes. Background Technology

[0002] MPP power pipes are power protection pipes extruded from modified polypropylene resin. Currently, although power pipes are manufactured in a certain length, they cannot fully match the complex path dimensions, corner positioning, and manhole connection positions on site. Therefore, during on-site installation, the power pipes are cut and lengthened according to the actual installation requirements to obtain the required pipe length. However, during the design and cutting process of MPP pipes for power applications, the cantilevered pipe section to be cut has a large sag due to its own weight. As the connection area at the pipe cutting joint gradually decreases, the pipe section may be partially broken before it is cut through. In order to suppress displacement, operators often increase the clamping force, but excessive clamping can easily cause plastic indentation or ellipticization on the pipe wall. Conventional clamps lack the function of stroke compensation with cutting depth, and the constraint force weakens later. The cut pipe section still has the risk of disturbance. In addition, the pipe diameter specifications vary at the construction site. Traditional positioning mechanisms need to repeatedly replace the gaskets and clamps according to the pipe diameter, which increases the adjustment time. In addition, during circumferential cutting, when the cutting reaches a certain depth, the cutting blade is embedded in the annular cut but has not yet cut through the pipe wall. The uncut core material undergoes local plastic flow under the radial compression of the saw blade. When the section of the pipe to be separated is short and light in weight, the radial force of the compression within the cut can easily cause the section to be separated to shift towards the cutting blade, resulting in intermittent scraping between the pipe opening and the side of the cutting blade, causing misalignment of the cut surface. Summary of the Invention

[0003] The purpose of this invention is to provide a power MPP cable duct circumferential cutting device. Relying on an axial tension compensation positioning mechanism, it can simultaneously achieve radial limiting and axial tension constraint of the pipe section, effectively suppressing pipe movement and sagging during the cutting process, ensuring a flat and even cut, and can adapt to multiple pipe specifications. It can be adaptively adjusted according to the cutting process, effectively solving the problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A power MPP cable conduit circumferential cutting device includes a frame, a lower roller frame movably mounted on the frame, a cylinder seat rotatably mounted inside the frame, a hydraulic cylinder fixedly mounted on the cylinder seat, a U-shaped swing beam rotatably mounted inside the frame above the hydraulic cylinder, a base fixedly mounted at one end of the U-shaped swing beam, and a pressure block fixedly mounted at the other end of the U-shaped swing beam. An axial tension compensation positioning mechanism is movably mounted on one side of the frame. The axial tension compensation positioning mechanism includes a carrier plate, a suspension plate fixedly mounted on the side of the carrier plate facing the frame, an installation groove formed at the end of the suspension plate away from the carrier plate, an installation block slidably mounted in the installation groove, a pressure block slidably mounted on one side of the installation block, a wheel frame movably mounted on the suspension plate below the installation block, a wheel cylinder rotatably mounted inside the wheel frame, a wheel groove formed circumferentially along the outer contour of the wheel cylinder, and a positioning wheel slidably fitted in the wheel groove.

[0005] As a further preferred embodiment of the present invention, a base is fixedly installed at the lower end of the frame, and a piston sleeve is rotatably installed inside the U-shaped swing beam. The piston sleeve is fixedly connected to one end of the piston rod of the hydraulic cylinder, so as to realize the swing function of the U-shaped swing beam through the hydraulic cylinder, thereby applying pressure to one end of the base. A first tension spring is provided between the U-shaped swing beam and the frame. One end of the first tension spring is hooked on a hanging column on one side of the U-shaped swing beam, and the other end of the first tension spring is hooked in a hanging ring on the base. So that after the hydraulic cylinder is depressurized, the U-shaped swing beam is pulled back to its original position by the tension of the first tension spring.

[0006] As a further preferred embodiment of the present invention, a guide rail is fixedly installed on one side of the frame, and the guide rail provides a mounting and guiding foundation for the axial tension compensation positioning mechanism to slide vertically along one side of the frame.

[0007] As a further preferred embodiment of the present invention, a geared motor is fixedly installed on one side of the machine base. The output shaft of the geared motor extends through the machine base toward the pressure block and is fixedly installed with a toothless cutting blade. When the U-shaped swing beam swings by levering the hydraulic cylinder, it can cooperate with the machine base to apply pressure toward the pipe to the toothless cutting blade, thereby realizing the rolling circumferential cutting of the pipe placed on the lower support roller frame by the toothless cutting blade. The geared motor is electrically connected to an external power source through a wire.

[0008] As a further preferred embodiment of the present invention, two first sliders are fixedly installed on the carrier plate near the suspension plate. Both first sliders are slidably connected to the guide rail. A second tension spring is provided between the carrier plate and the frame. One end of the second tension spring is hooked on a hanging column on one side of the frame, and the other end of the second tension spring is hooked on a hanging column on one side of the carrier plate. In this way, the tension of the second tension spring provides an upward pulling force for the carrier plate to move upward and reset.

[0009] As a further preferred embodiment of the present invention, two fixed shafts are symmetrically fixedly installed in the suspension plate located below the mounting groove. The fixed shafts provide a basis for the installation of the wheel frame and lateral sliding. A third compression spring is respectively fitted on the outside of each fixed shaft.

[0010] As a further preferred embodiment of the present invention, the mounting block has first sliding grooves on both sides, and two countersunk holes are vertically formed inside the mounting block. A first connecting bolt is inserted into the countersunk hole. The first sliding groove is slidably engaged with the inner wall of the mounting groove. The lower end of the first connecting bolt is threaded into the bottom of the inner groove of the mounting groove. A second compression spring is fitted on the outside of the first connecting bolt. The upper end of the second compression spring abuts against the lower end face of the mounting block, and the lower end of the second compression spring abuts against the bottom of the inner groove of the mounting groove. Thus, the mounting block moves vertically within the mounting groove by means of the first sliding grooves on both sides, and the upper limit is limited by the first connecting bolt to prevent it from falling out. Two second sliding grooves are symmetrically formed on the side of the mounting block where the pressure block is located. A second connecting bolt is vertically inserted into and threaded into each second sliding groove. A first compression spring is fitted on the outside of the second connecting bolt.

[0011] As a further preferred embodiment of the present invention, two second sliders adapted to the second slide groove are symmetrically fixedly installed on the side of the pressure block facing the mounting block. The second sliders are slidably installed in the corresponding second slide groove and pass through the second connecting bolt. The upper end of the first compression spring abuts against the lower end face of the second slider, and the lower end of the first compression spring abuts against the bottom of the inner groove of the second slide groove. The pressure block swings with the seat and presses against the pressure block, causing the mounting block to drive the suspension plate to move down. Then, the suspension plate rolls and presses the positioning wheel against the second separation pipe section through the wheel frame to limit the second separation pipe section to be separated from sagging and shifting due to gravity, which would cause the cut surface to break and affect the flatness of the cut surface. A side extension plate is fixedly installed on the side of the mounting block away from the pressure block. A push block is fixedly installed on the end of the side extension plate away from the mounting block. The lower end face of the push block is provided with a slope.

[0012] As a further preferred embodiment of the present invention, two bushings are symmetrically fixedly installed inside the wheel frame located on both sides of the wheel cylinder. The wheel frame passes through and slides on the corresponding fixed shaft. One end of the third compression spring abuts against the side of the wheel frame facing the suspension plate, and the other end of the third compression spring abuts against the side of the suspension plate facing the bushing. A push block is fixedly installed on the upper end of the wheel frame. The upper end surface of the push block has a slope that matches the lower end surface of the push block. This allows the positioning wheel to roll against the second separation pipe section. To ensure the continued downward cutting action of the toothless cutting blade, the pressure block continues to push the pressure block downward. The mounting block continuously applies downward pressure to the suspension plate, wheel frame, and positioning wheel in conjunction with the mounting block. Simultaneously, the mounting block moves downward within the mounting groove and compresses the second compression spring, causing the mounting block, in conjunction with the side extension plate, to move the push block downward and push the support block to one side. This enables the wheel frame to slide horizontally on two fixed shafts using two bushings. A fourth compression spring is fitted inside the wheel groove. One end of the fourth compression spring abuts against one side of the positioning wheel, and the other end abuts against one side of the wheel groove relative to the positioning wheel. Thus, the compressed fourth compression spring, in conjunction with the positioning wheel, provides continuous circumferential thrust to the second separation pipe section.

[0013] As a further preferred embodiment of the present invention, the tensile stiffness coefficient of the second tension spring is less than the compression stiffness coefficient of the first compression spring and the second compression spring, and the compression stiffness coefficient of the first compression spring is less than the compression stiffness coefficient of the second compression spring, thereby realizing the sequential segmented pressing action of the suspension plate, the pressure block, and the mounting block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, a circumferential tension compensation positioning mechanism is set on one side of the frame. It can achieve segmented pressing action through the structure of various tension springs and compression springs with different stiffness coefficients. During operation, the positioning wheel first rolls and presses the second separation pipe section to be separated, thereby restraining the downward displacement caused by its own weight and avoiding the situation of chipping or local breakage of the cut due to additional shearing action. At the same time, during the cutting feed process, the compression deformation of the first compression spring and the second compression spring is used to compensate for the feed stroke, continuously outputting a stable clamping force and preventing plastic deformation of the MPP pipe wall caused by rigid extrusion.

[0015] 2. In this invention, the positioning wheel has lateral adaptive capability through the sliding cooperation between the wheel frame and the fixed shaft. It can synchronously offset axial movement as the internal stress of the pipe is released. During the circumferential cutting operation, the positioning wheel applies a continuous axial thrust to the second separated pipe section to offset the axial movement during the cutting process. Combined with the radial clamping action, it can maintain the coaxiality of the pipe body, so that the cut is always in the same cross section, improve the flatness of the end faces of the two pipe sections, and reduce the probability of uneven cut edges.

[0016] 3. In this invention, the axial tension compensation positioning mechanism, through the vertical sliding fit between the carrier plate and the guide rail, the vertical sliding fit between the pressure block and the mounting block, and the nested structure of the positioning wheel and the wheel groove, can adapt to different specifications of MPP cable pipes within a certain outer diameter range. It does not require additional replacement of positioning fixtures, thus improving the device's adaptability to different construction conditions and pipe models and reducing the workload of on-site fixture adjustments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first side view of the main structure of the present invention; Figure 2 This is a schematic diagram of the second side of the main structure of the present invention; Figure 3 This is a schematic diagram of the main structure of the present invention in a cutting state; Figure 4 for Figure 1 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the assembly structure of the U-shaped swing frame and the geared motor of the present invention; Figure 6 This is a schematic diagram of the first side view of the axial tension compensation positioning mechanism of the present invention; Figure 7 This is a schematic diagram of the second side of the axial tension compensation positioning mechanism of the present invention; Figure 8 This is a schematic diagram of the disassembled structure of the mounting block and the pressure-bearing block of the present invention; Figure 9 This is a schematic diagram of the assembly structure of the wheel barrel and the positioning wheel of the present invention; Figure 10 This is a schematic diagram of the positioning wheel structure of the present invention.

[0018] In the diagram: 1. Frame; 2. Lower roller frame; 3. Cylinder seat; 4. Hydraulic cylinder; 5. U-shaped swing beam; 6. Machine base; 7. Pressure block; 8. Gear motor; 9. Toothless cutting blade; 10. Axial tension compensation positioning mechanism; 11. Carrier plate; 12. Suspension plate; 13. Mounting groove; 14. Mounting block; 15. Pressure block; 16. Wheel frame; 17. Wheel cylinder; 18. Wheel groove; 19. Positioning wheel; 20. Piston sleeve; 21. First tension spring; 22. Guide rail; 23. First slide 24. Second tension spring; 25. First slide groove; 26. Countersunk hole; 27. First connecting bolt; 28. Side extension plate; 29. ​​Push block; 30. Second slide groove; 31. Second connecting bolt; 32. First compression spring; 33. Second slider; 34. Second compression spring; 35. Fixed shaft; 36. Bushing; 37. Push block; 38. Third compression spring; 39. Base; 40. First separation pipe section; 41. Second separation pipe section; 42. Fourth compression spring. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] like Figure 1 - Figure 10 As shown, the present invention provides a power MPP cable conduit circumferential cutting device, comprising a frame 1, a lower roller frame 2 movably mounted on the frame 1, a cylinder seat 3 rotatably mounted inside the frame 1, a hydraulic cylinder 4 fixedly mounted on the cylinder seat 3, a U-shaped swing beam 5 rotatably mounted inside the frame 1 above the hydraulic cylinder 4, a base 6 fixedly mounted at one end of the U-shaped swing beam 5, a pressure block 7 fixedly mounted at the other end of the U-shaped swing beam 5, and an axial tension compensation positioning mechanism 10 movably mounted on one side of the frame 1. The compensation positioning mechanism 10 includes a carrier plate 11. A suspension plate 12 is fixedly installed on the side of the carrier plate 11 facing the frame 1. A mounting groove 13 is provided at the end of the suspension plate 12 away from the carrier plate 11. A mounting block 14 is slidably installed in the mounting groove 13. A pressure block 15 is slidably installed on one side of the mounting block 14. A wheel frame 16 is movably installed on the suspension plate 12 located below the mounting block 14. A wheel cylinder 17 is rotatably installed in the wheel frame 16. A wheel groove 18 is provided circumferentially along the outer contour of the wheel cylinder 17. A positioning wheel 19 is slidably fitted in the wheel groove 18.

[0021] Specifically, in this embodiment, a base 39 is fixedly installed at the lower end of the frame 1, a piston sleeve 20 is rotatably installed inside the U-shaped swing beam 5, and the piston sleeve 20 is fixedly connected to one end of the piston rod of the hydraulic cylinder 4. A geared motor 8 is fixedly installed on one side of the base 6. The output shaft of the geared motor 8 extends through the base 6 toward the pressure block 7 and a toothless cutting blade 9 is fixedly installed thereon. The geared motor 8 is electrically connected to an external power source through a wire. During operation, the crank handle is inserted into the sleeve of the hydraulic cylinder 4 and pressed back and forth. The piston rod can then push one end of the U-shaped swing beam 5 upward through the piston sleeve 20, causing the U-shaped swing beam 5 to swing around its rotational contact point with the frame 1. This causes one end of the U-shaped swing beam 5 to drive the base 6, along with the geared motor 8 and the toothless cutting blade 9, to press against the pipe wall, while the other end drives the pressure block 7 to swing downward synchronously.

[0022] In the initial pressing stage, the pressure block 7 first contacts the upper surface of the pressure block 15. A guide rail 22 is fixedly installed on one side of the frame 1. Two first sliders 23 are fixedly installed on the carrier plate 11 near the suspension plate 12. Both first sliders 23 are slidably connected to the guide rail 22. Since the second tension spring 24 has the smallest tensile stiffness coefficient, the carrier plate 11, together with the suspension plate 12, mounting block 14, wheel frame 16, and positioning wheel 19, slides downwards along the guide rail 22 as a whole. The positioning wheel 19 presses against the surface of the second separation tube section 41 to be separated in a rolling contact manner, thus forming a positioning of the tube body together with the two rollers of the lower roller frame 2. Simultaneously, it effectively restrains the sagging tendency of the shorter second separation tube section 41 due to its own weight, preventing abnormal breakage after the cutting depth increases. In this situation, after the U-shaped swing beam 5 presses the toothless cutting blade 9 against the pipe wall, the reduction motor 8 drives the toothless cutting blade 9 to enter a rotating state. The circumferential friction generated by the cutting blade contacting the pipe wall drives the pipe body to passively rotate around its own axis on the roller of the lower roller frame 2, thereby realizing the rolling circumferential cutting of the outer circumference of the pipe body. As the pressure block 7 continues to feed, in order to achieve multi-stage pressure transmission, two fixed shafts 35 are symmetrically fixedly installed in the suspension plate 12 located below the mounting groove 13. A third compression spring 38 is respectively fitted on the outside of each fixed shaft 35. The mounting block 14 has a first sliding groove 25 on both sides. Two countersunk holes 26 are vertically opened in the mounting block 14. A first connecting bolt 27 is inserted into the countersunk hole 26. The first sliding groove 25 and the inner groove wall of the mounting groove 13 are connected. In a sliding fit, the lower end of the first connecting bolt 27 is threaded into the bottom of the inner groove of the mounting groove 13. A second compression spring 34 is fitted on the outside of the first connecting bolt 27. The upper end of the second compression spring 34 abuts against the lower end face of the mounting block 14, and the lower end of the second compression spring 34 abuts against the bottom of the inner groove of the mounting groove 13. Two second sliding grooves 30 are symmetrically opened on the side of the mounting block 14 where the pressure block 15 is located. A second connecting bolt 31 is threaded through and threaded into each second sliding groove 30. A first compression spring 32 is fitted on the outside of the second connecting bolt 31. Two second sliders 33 that are adapted to the second sliding grooves 30 are symmetrically fixedly installed on the side of the pressure block 15 facing the mounting block 14. The second sliders 33 are slidably installed in the corresponding second sliding grooves 30 and pass through. The first compression spring 32 is mounted on the second connecting bolt 31, and the upper end of the first compression spring 32 abuts against the lower end face of the second slider 33. The lower end of the first compression spring 32 abuts against the bottom of the inner groove of the second slide groove 30. The tensile stiffness coefficient of the second tension spring 24 is less than the compression stiffness coefficient of the first compression spring 32 and the second compression spring 34. The compression stiffness coefficient of the first compression spring 32 is less than the compression stiffness coefficient of the second compression spring 34. Therefore, the pressure block 15 overcomes the resistance of the first compression spring 32 and slides downward relative to the mounting block 14. The compression reaction force generated by the first compression spring 32 is converted into a continuous and flexible radial clamping force. This mechanism compensates for the cutting feed stroke while avoiding the plastic indentation and elliptical deformation of the second separation pipe section 41 pipe wall caused by rigid locking. Additionally, a side extension plate 28 is fixedly installed on the side of the mounting block 14 away from the pressure block 15. A push block 29 is fixedly installed on the end of the side extension plate 28 away from the mounting block 14. The lower end face of the push block 29 is provided with a slope. Two bushings 36 are symmetrically fixedly installed in the wheel frame 16 located on both sides of the wheel cylinder 17. The wheel frame 16 passes through and slides on the corresponding fixed shaft 35. One end of the third compression spring 38 abuts against the side of the wheel frame 16 facing the suspension plate 12, and the other end of the third compression spring 38 abuts against the side of the suspension plate 12 facing the suspension plate 12. On one side of the bushing 36, a push block 37 is fixedly installed on the upper end of the wheel frame 16. The upper end surface of the push block 37 is provided with a slope that matches the lower end surface of the push block 29. A fourth compression spring 42 is installed inside the wheel groove 18. One end of the fourth compression spring 42 abuts against one side of the positioning wheel 19, and the other end of the fourth compression spring 42 abuts against one side of the wheel groove 18 relative to the positioning wheel 19. When the circumferential cutting reaches a certain depth and the toothless cutting blade 9 is embedded in the annular cut but has not yet cut off the pipe wall, the pressure block 15 has already pushed the first compression spring 37 into place. 2. When the compression reaches a certain stage, it causes the mounting block 14 to begin compressing the second compression spring 34, which has a larger stiffness coefficient. This causes the mounting block 14 to move downward within the mounting groove 13. The side extension plate 28, which is fixed to the mounting block 14, drives the push block 29 to move downward simultaneously. The slope of the push block 29 pushes the support block 37. Because the positioning wheel 19 is a rubber wheel, the friction between it and the outer wall of the second separation pipe section 41 prevents the rolling contact point from shifting. This forces the wheel frame 16 to slide laterally along the fixed shaft 35. At this time, the third compression spring 38 is compressed. Meanwhile, the fourth compression spring 42 is also further compressed. Since the wheel frame 16 no longer moves laterally under the cooperation of the push block 37 and the push block 29, the compressed fourth compression spring 42 applies a continuous axial thrust to the positioning wheel 19. This thrust actively counteracts the axial movement caused by the toothless cutting blade 9 squeezing the core material of the cut without affecting the rotation of the tube body, thereby maintaining the coaxiality of the first separation tube section 40 and the second separation tube section 41, making the cut surfaces of the two tube sections relatively parallel, and ensuring that the cut is flat and even.

[0023] Specifically, in this embodiment, after the second separation pipe section 41 is completely cut off from the first separation pipe section 40, the second separation pipe section 41, no longer restrained, uses the rebound force of the fourth compression spring 42 to make the positioning wheel 19 slide in the wheel groove 18 and simultaneously push the fourth compression spring 42 away from the first separation pipe section 40. After that, the hydraulic cylinder 4 is depressurized. A first tension spring 21 is provided between the U-shaped swing beam 5 and the frame 1. One end of the first tension spring 21 is hooked on the hanging column on one side of the U-shaped swing beam 5, and the other end is hooked on the hanging ring on the base 39. The tension of the first tension spring 21 drives the U-shaped swing beam 5 to return to its original swing position. One end of the U-shaped swing beam 5 drives the base 6 and the toothless cutting blade 9 to lift away from the pipe body, and the other end of the pressure block 7 simultaneously disengages from the pressure block 15. After the pressure block 7 is released from its pressure, the second compression spring 34 pushes the mounting block 14 upward. The mounting block 14 slides upward along the mounting groove 13 using the first sliding groove 25 to reset itself. The side extension plate 28 on one side of the mounting block 14 drives the push block 29 to move upward. The slope of the push block 29 exits the lateral pushing of the support block 37. The third compression spring 38 then pushes the wheel frame 16 to slide laterally back to the initial position along the fixed shaft 35. Subsequently, the first compression spring 32 pushes the support block 15 upward. The support block 15 slides upward along the second sliding groove 30 via the second slider 33 to reset itself. Simultaneously, the second tension spring 24 pulls the carrier plate 11 together with the suspension plate 12, mounting block 14, wheel frame 16 and positioning wheel 19 upward along the guide rail 22 back to the initial height. The positioning wheel 19 disengages from the surface of the second separation pipe section 41, and the device returns to the standby state.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A device for circumferential cutting of power MPP cable conduits, characterized in that: The machine includes a frame (1), on which a lower roller frame (2) is movably mounted. A cylinder seat (3) is rotatably mounted inside the frame (1), and a hydraulic cylinder (4) is fixedly mounted on the cylinder seat (3). A U-shaped swing beam (5) is rotatably mounted inside the frame (1) above the hydraulic cylinder (4). A base (6) is fixedly mounted at one end of the U-shaped swing beam (5), and a pressure block (7) is fixedly mounted at the other end of the U-shaped swing beam (5). An axial tension compensation positioning mechanism (10) is movably mounted on one side of the frame (1). The axial tension compensation positioning mechanism (10) includes a carrier plate (11). The carrier plate (11) is fixedly mounted with a suspension plate (12) on the side facing the frame (1). The suspension plate (12) is provided with a mounting groove (13) at the end away from the carrier plate (11). A mounting block (14) is slidably mounted in the mounting groove (13). A pressure block (15) is slidably mounted on one side of the mounting block (14). A wheel frame (16) is movably mounted on the suspension plate (12) located below the mounting block (14). A wheel cylinder (17) is rotatably mounted in the wheel frame (16). A wheel groove (18) is provided circumferentially along the outer contour of the wheel cylinder (17). A positioning wheel (19) is slidably fitted in the wheel groove (18).

2. The power MPP cable conduit ring cutting device according to claim 1, characterized in that: A base (39) is fixedly installed at the lower end of the frame (1). A piston sleeve (20) is rotatably installed inside the U-shaped swing beam (5). The piston sleeve (20) is fixedly connected to one end of the piston rod of the hydraulic cylinder (4). A first tension spring (21) is provided between the U-shaped swing beam (5) and the frame (1). One end of the first tension spring (21) is hooked on a hanging column on one side of the U-shaped swing beam (5), and the other end of the first tension spring (21) is hooked in a hanging ring on the base (39).

3. The power MPP cable conduit ring cutting device according to claim 1, characterized in that: A guide rail (22) is fixedly installed on one side of the frame (1).

4. The power MPP cable conduit ring cutting device according to claim 1, characterized in that: A geared motor (8) is fixedly installed on one side of the base (6). The output shaft of the geared motor (8) extends through the base (6) toward the pressure block (7) and is fixedly installed with a toothless cutting blade (9). The geared motor (8) is electrically connected to an external power source through a wire.

5. The power MPP cable conduit ring cutting device according to claim 3, characterized in that: Two first sliders (23) are fixedly installed on the carrier plate (11) near the suspension plate (12). Both first sliders (23) are slidably connected to the guide rail (22). A second tension spring (24) is provided between the carrier plate (11) and the frame (1). One end of the second tension spring (24) is hooked on a hanging post on one side of the frame (1), and the other end of the second tension spring (24) is hooked on a hanging post on one side of the carrier plate (11).

6. The power MPP cable conduit ring cutting device according to claim 5, characterized in that: Two fixed shafts (35) are symmetrically fixedly installed in the suspension plate (12) located below the mounting groove (13), and a third compression spring (38) is respectively fitted on the outside of each fixed shaft (35).

7. A power MPP cable conduit ring cutting device according to claim 6, characterized in that: The mounting block (14) has two first sliding grooves (25) on both sides. The mounting block (14) has two vertical countersunk holes (26) in the interior. A first connecting bolt (27) is inserted into the countersunk hole (26). The first sliding groove (25) slides with the inner wall of the mounting groove (13). The lower end of the first connecting bolt (27) is threaded into the bottom of the inner groove of the mounting groove (13). A second compression spring (34) is fitted on the outside of the first connecting bolt (27). The upper end of the second compression spring (34) abuts against the lower end face of the mounting block (14). The lower end of the second compression spring (34) abuts against the bottom of the inner groove of the mounting groove (13). The mounting block (14) has two second sliding grooves (30) symmetrically opened on the side with the pressure block (15). A second connecting bolt (31) is threaded through and threaded into each second sliding groove (30). A first compression spring (32) is fitted on the outside of the second connecting bolt (31).

8. The power MPP cable conduit ring cutting device according to claim 7, characterized in that: Two second sliders (33) adapted to the second slide groove (30) are symmetrically fixedly installed on the side of the pressure block (15) facing the mounting block (14). The second sliders (33) are slidably installed in the corresponding second slide groove (30) and pass through the second connecting bolt (31). The upper end of the first compression spring (32) abuts against the lower end face of the second slider (33), and the lower end of the first compression spring (32) abuts against the bottom of the inner groove of the second slide groove (30). A side extension plate (28) is fixedly installed on the side of the mounting block (14) away from the pressure block (15). A push block (29) is fixedly installed on the end of the side extension plate (28) away from the mounting block (14). The lower end face of the push block (29) is provided with a slope.

9. A power MPP cable conduit ring cutting device according to claim 8, characterized in that: Two bushings (36) are symmetrically fixedly installed in the wheel frame (16) located on both sides of the wheel cylinder (17). The wheel frame (16) passes through and slides on the corresponding fixed shaft (35). One end of the third compression spring (38) abuts against the side of the wheel frame (16) facing the suspension plate (12), and the other end of the third compression spring (38) abuts against the side of the suspension plate (12) facing the bushing (36). A push block (37) is fixedly installed on the upper end of the wheel frame (16). The upper end surface of the push block (37) is provided with a slope that matches the lower end surface of the push block (29). A fourth compression spring (42) is fitted in the wheel groove (18). One end of the fourth compression spring (42) abuts against the side of the positioning wheel (19), and the other end of the fourth compression spring (42) abuts against the side of the wheel groove (18) relative to the positioning wheel (19).

10. A power MPP cable conduit ring cutting device according to claim 7, characterized in that: The tensile stiffness coefficient of the second tension spring (24) is less than the compression stiffness coefficients of the first compression spring (32) and the second compression spring (34), and the compression stiffness coefficient of the first compression spring (32) is less than the compression stiffness coefficient of the second compression spring (34).

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