MPP cable protection pipe production and processing equipment and use method

Abstract

The invention relates to the technical field of protection pipe machining, in particular to MPP cable protection pipe production and machining equipment and a using method, the MPP cable protection pipe production and machining equipment comprises an in-pipe self-adaptive grinding unit, an outer wall magnetic control positioning unit and a pipe supporting and driving unit, and a central control unit can be further configured to be used for linkage regulation and control of all the units. According to the MPP cable protection pipe production and machining equipment and the using method, the thickness difference of the pipe wall can be automatically recognized, and self-adaptive grinding is achieved, dynamic balance is formed by means of magnetic coupling acting force and pre-tightening force of a mechanical elastic pre-tightening assembly, when the pipe wall thickness is increased, magnetic coupling magnetic force is weakened, the pre-tightening force automatically pushes a grinding machine to stretch out and draw back to be attached to the pipe wall side, and the grinding effect is achieved. When the wall thickness of the pipe is reduced, the magnetic coupling magnetic force is enhanced, the grinding machine is driven to reset reversely, the matched grinding attaching force is kept all the time, the requirements for different wall thicknesses can be precisely met without manual intervention, the problems that existing equipment is poor in grinding adaptability and needs manual adjustment are thoroughly solved, and the grinding precision and efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of protective tube processing technology, specifically to an MPP cable protective tube production and processing equipment and its usage method. Background Technology

[0002] With its core advantages such as high temperature resistance, high pressure resistance, excellent insulation performance, environmental friendliness and durability, MPP cable protection pipe has become a key supporting material in power cable laying projects, especially in urban power grid upgrades and underground pipe gallery construction.

[0003] Because the outer sheath of power cables is easily damaged by sharp objects, which can lead to safety hazards such as insulation failure and short circuits, extremely high requirements are placed on the smoothness of the inner wall of MPP cable protection pipes. During the production and processing, burrs, weld marks and uneven defects remaining on the inner wall of the pipe must be thoroughly removed to ensure that the cable can be installed smoothly without damage.

[0004] However, existing MPP cable protection pipe inner wall grinding equipment still has many technical bottlenecks, making it difficult to meet the high precision and high efficiency requirements of actual production:

[0005] Firstly, the grinding adaptability is poor. Most mainstream equipment uses a fixed-size grinding head structure, which cannot adapt to pipes with different diameters and wall thicknesses. Faced with the unavoidable pipe wall thickness deviations during the production process, it is easy to have problems with incomplete or excessive grinding in some areas, resulting in uneven pipe wall thickness and affecting structural strength.

[0006] Secondly, the positioning method is unreasonable. Existing equipment generally adopts contact positioning structures such as mechanical clamping, which can easily cause scratches and indentations on the outer wall of the pipe during positioning and movement. This not only damages the appearance quality, but may also damage the surface insulation structure of the pipe, reducing its insulation performance and service life.

[0007] Third, the degree of automation is low. For pipes of different specifications, the position and positioning parameters of the grinding head need to be adjusted frequently by hand. The operation is cumbersome and inefficient, and it is difficult to adapt to the continuous operation requirements of large-scale production lines.

[0008] In addition, while some adaptive grinding equipment for irregularly shaped tubes can achieve a certain degree of shape adaptation, they are complex in structure, expensive, and do not take into account the insulation characteristics and lightweight requirements of MPP cable protection tubes, so they cannot be directly applied.

[0009] Based on this, developing an MPP cable protection pipe production and processing equipment that combines adaptive grinding capabilities, non-contact precise positioning, adaptability to insulation protection requirements, and a high degree of automation has become a technical challenge that the industry urgently needs to solve. Summary of the Invention

[0010] The purpose of this invention is to provide an MPP cable protection pipe production and processing equipment and its usage method, to solve the problems of poor grinding adaptability, unreasonable positioning method, and low degree of automation mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: an MPP cable protection pipe production and processing equipment, including an internal adaptive grinding unit, an external wall magnetic control positioning unit, and a pipe support drive unit, and may also be configured with a central control unit for the linkage control of each unit.

[0011] The outer wall magnetic positioning unit includes a movable magnetic ring sleeved on the outer wall of the pipe. The movable magnetic ring is an integrated encapsulated ring electromagnetic structure with rolling wheels evenly arranged on its inner circumference. The rolling wheels roll in cooperation with the outer wall of the pipe to achieve radial limiting, ensuring that the movable magnetic ring remains coaxial with the pipe during movement and reducing axial movement resistance.

[0012] A fully closed magnetic ring is embedded inside a movable magnetic ring to generate a uniform annular magnetic repulsive force in the movable magnetic ring, ensuring the stability of the magnetic coupling.

[0013] The tube-in-the-tube adaptive grinding unit includes a tube-in-the-tube central moving frame and a magnetically controlled grinding component. The tube-in-the-tube central moving frame is an integrated structure, including a central main unit, circumferential spring legs, and a main shaft magnetic traction structure.

[0014] Several circumferential spring legs are evenly distributed around the central host, with a roller integrated at the end away from the central host, and at least two circumferential spring legs are equipped with drive motors to provide power for the axial movement of the central moving frame inside the tube.

[0015] The elastic force of the circumferential spring legs keeps the rollers in contact with the tube wall, ensuring a centered position. The main shaft magnetic traction structure includes three sets of radially extending magnetic columns evenly arranged circumferentially near the front end of the central main unit, with permanent magnet chucks mounted at the ends away from the central main unit.

[0016] The circumferential distribution trajectory of each permanent magnet chuck is precisely matched with the inner ring adsorption area of ​​the movable magnetic ring, and the magnetic poles of the corresponding areas of the two are set to opposite names. Through the multi-point distributed magnetic attraction force, a stable traction link is formed, realizing the synchronous axial movement of the central host and the movable magnetic ring.

[0017] The magnetically controlled grinding assembly is evenly arranged circumferentially along the centrally moving frame inside the tube, including a circumferential rotating frame, a magnetically driven slide, a separate sliding guide structure, a mechanically elastic pre-tightening assembly, and a grinding machine.

[0018] The circumferential rotating frame is mounted on the outside of the central host through a bearing set and can rotate relative to the central host. Its outer ring has a pre-set radial guide groove, the magnetic drive slide is embedded in the radial guide groove, and the circumferential rotating frame has a radially extending fixed boss at the position corresponding to the split sliding guide structure.

[0019] The magnetic grinding assembly is equipped with a micro servo motor as an independent rotary drive mechanism. The micro servo motor is fixed to the side wall of the central host through a bracket. Its output shaft is fitted with a drive gear. The driven gear ring is coaxially fixed inside the circumferential rotating frame. The drive gear meshes with the driven gear ring.

[0020] After the micro servo motor is started, the power is transmitted to the circumferential rotating frame through gear transmission, which drives it to rotate around the central host, thereby driving the magnetic drive slide block embedded in the radial guide groove to rotate synchronously in the circumferential direction. At the same time, the magnetic drive slide block can slide along the radial guide groove to achieve radial displacement.

[0021] The magnetic drive slide and the movable magnetic ring are coaxially aligned and arranged with opposite magnetic poles to form a stable radial magnetic coupling field. The split sliding guide structure includes a transmission end and an execution end. The magnetic drive slide is installed on the transmission end, and the execution end is fixedly assembled with the grinder. The radial displacement of the magnetic drive slide is directly transmitted to the grinder through the transmission link of "transmission end → execution end", realizing the radial extension and retraction of the grinder.

[0022] The split sliding guide structure offsets the installation position of the grinder from the magnetic induction position of the magnetic drive slide along the axial direction, so as to avoid the magnetic force directly affecting the working stability of the grinder;

[0023] The split sliding guide structure provides precise radial sliding constraint to the grinder, ensuring that the grinder only extends or retracts radially towards or away from the pipe wall. The mechanical elastic preload assembly is a disc spring group, coaxially mounted between the actuator end and the fixed boss of the circumferential rotating frame. This mounting position neither interferes with the circumferential rotation of the circumferential rotating frame nor obstructs the power transmission link.

[0024] The disc spring assembly is normally in a pre-compressed state, providing a pre-tightening force towards the pipe wall to the actuator.

[0025] The preload force forms an opposite balance with the radial magnetic repulsion force on the magnetic drive slide, and is directly transmitted to the grinder through the actuator to dynamically adjust the initial position of the grinder and the grinding adhesion force.

[0026] The pipe support drive unit includes several sets of symmetrically arranged rollers. The surface of the rollers is covered with an elastic protective layer to support the MPP cable protection pipe to be processed and ensure the stability of the grinding process.

[0027] The central control unit is electrically connected to the drive motor of the central moving frame inside the tube and the grinding machine, respectively. It can adjust the magnetic intensity of the movable magnetic ring, the axial movement speed of the central moving frame inside the tube and the grinding pressure of the magnetically controlled grinding components, thereby further improving the automation level and grinding accuracy of the equipment operation.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. Adopting a non-contact magnetic control positioning design, the positioning process has no mechanical structure in direct contact with the outer wall of the pipe: precise positioning is achieved through the magnetic coupling between the movable magnetic ring and the magnetic drive slide inside the pipe. With the help of the rolling wheel structure on the inner side of the movable magnetic ring, it can ensure that it remains coaxial with the pipe during the positioning process and reduce the movement resistance. It effectively avoids the scratches, indentations and other damage to the outer wall of the pipe caused by traditional contact positioning, and ensures the appearance quality and insulation performance of the MPP cable protection pipe. It is especially suitable for power engineering pipes with high insulation requirements.

[0030] 2. The core advantage lies in its ability to automatically identify differences in pipe wall thickness and achieve adaptive grinding: By leveraging the dynamic balance between the magnetic coupling force and the pre-tightening force of the mechanical elastic pre-tightening component, when the pipe wall thickness increases, the magnetic coupling force weakens accordingly, and the pre-tightening force automatically pushes the grinding machine to extend and fit towards the pipe wall side.

[0031] When the pipe wall thickness is reduced, the magnetic coupling force is enhanced, driving the grinding machine to reverse and reset, always maintaining the appropriate grinding fit force. It can accurately adapt to different wall thickness requirements without manual intervention, completely solving the problem of poor grinding adaptability and the need for manual adjustment of existing equipment, and greatly improving grinding accuracy and efficiency.

[0032] 3. The main shaft magnetic traction structure ensures stable and reliable magnetic coupling positioning, providing a solid foundation for wall thickness identification and adaptive grinding: Through three sets of circumferentially evenly arranged radially extending magnetic columns and permanent magnet chucks, a multi-point distributed magnetic traction link is formed with the movable magnetic ring, ensuring that the centrally located moving frame inside the tube and the movable magnetic ring always move axially synchronously, avoiding instability of the magnetic coupling field due to relative offset between the two, which would affect the accuracy of wall thickness identification. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0034] Figure 2 This is a schematic diagram of the outer wall magnetic positioning unit and the movable magnetic ring of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the adaptive grinding unit inside the tube of the present invention;

[0036] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0037] Figure 5 This is a schematic diagram of the structure of the central host and the circumferential rotating frame of the present invention. Figure 1 ;

[0038] Figure 6 This is a schematic diagram of the structure of the central host and the circumferential rotating frame of the present invention. Figure 2 ;

[0039] Figure 7 This is an exploded view of the circumferential rotating frame, transmission end, and execution end of the present invention.

[0040] In the diagram: 1. In-tube adaptive grinding unit; 11. In-tube centering moving frame; 111. Circumferential spring leg; 1111. Roller; 1112. Drive motor; 112. Central host; 113. Spindle magnetic traction structure; 1131. Magnetic column; 1132. Permanent magnet chuck; 12. Magnetic control grinding assembly; 121. Circumferential rotating frame; 1211. Radial guide groove; 1212. Fixed boss; 122. Magnetic drive slide; 123. Separate sliding guide structure; 1231. Transmission end; 1232. Actuation end; 124. Mechanical elastic pre-tightening assembly; 125. Grinding machine; 126. Micro servo motor; 2. Outer wall magnetic control positioning unit; 21. Movable magnetic ring; 22. Rolling wheel; 3. Pipe support drive unit. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 7 This invention provides a technical solution: an MPP cable protection pipe production and processing equipment, including an internal self-adaptive grinding unit 1, an external wall magnetic control positioning unit 2, and a pipe support drive unit 3, configured with a central control unit to achieve linkage control. The internal centering moving frame 11 is integrally formed from aluminum alloy, the central host 112 has a diameter adapted to common pipe specifications, and four circumferential spring legs 111 are evenly arranged along its circumference, providing a telescopic stroke adaptable to different pipe diameters.

[0043] Each circumferential spring leg 111 has a polyurethane roller 1111 at the end away from the central host 112, and the two circumferential spring legs 111 arranged opposite each other are equipped with drive motors 1112, which can drive the central moving frame 11 inside the tube to move smoothly along the axial direction.

[0044] The main shaft magnetic traction structure 113 has three sets of radially extending magnetic columns 1131 evenly arranged around the central host 112 near the preset front end position. The magnetic columns 1131 are made of stainless steel and their length can be adjusted according to different diameter MPP cable protection pipes. The ends of the magnetic columns 1131 away from the central host 112 are equipped with permanent magnet chucks 1132. The circumferential distribution trajectory of each permanent magnet chuck 1132 is precisely aligned with the inner ring adsorption area of ​​the movable magnetic ring 21. The corresponding areas of the permanent magnet chuck 1132 and the movable magnetic ring 21 are set as opposite magnetic poles to ensure the formation of a stable magnetic traction link.

[0045] The movable magnetic ring 21 of the outer wall magnetic positioning unit adopts a ring electromagnetic structure. Its inner diameter can be replaced and adapted according to the common MPP cable protection pipe diameter. Rolling wheels 22 are evenly arranged on the inner circumference of the movable magnetic ring 21. The rolling wheels 22 are made of rubber and roll in cooperation with the outer wall of the pipe to ensure that the movable magnetic ring 21 and the pipe maintain good coaxiality.

[0046] The fully enclosed magnetic ring 213 is made of silicon steel sheet and is embedded in the middle of the inner side of the movable magnetic ring 21 to generate a uniform annular magnetic repulsive force in the movable magnetic ring 21.

[0047] The magnetic grinding assembly 12 is evenly arranged in 4 groups along the circumference of the central moving frame 11 inside the tube. The circumferential rotating frame 121 of each group is mounted on the outside of the central host 112 through a deep groove ball bearing. The circumferential rotating frame 121 is provided with a radially extending fixed boss 1212 at the position corresponding to the separate sliding guide structure 123, and is equipped with a micro servo motor 126 as an independent rotation drive mechanism.

[0048] The micro servo motor 126 is fixed to the side wall of the central host 112 by L-shaped bracket bolts. Its output shaft is fitted with a drive gear. The inner side of the circumferential rotating frame 121 is coaxially fixed with a driven gear ring of the same module by internal hex bolts to ensure good meshing transmission.

[0049] The outer ring of the circumferential rotating frame 121 has a pre-set radial guide groove 1211, each of which is fitted with a magnetic drive slide 122;

[0050] After the micro servo motor 126 is started, it drives the circumferential rotating frame 121 to rotate at a relatively slow speed through the meshing transmission of the active gear and the driven gear ring. This drives the magnetic drive slide block 122, which is embedded in the radial guide slide groove 1211, to rotate synchronously in the circumferential direction. The relatively slow speed can avoid generating excessive centrifugal force and will not cause radial displacement of the grinder 125.

[0051] Meanwhile, the magnetic drive slide 122 can slide along the radial guide groove 1211;

[0052] The magnetic drive slide 122 and the movable magnetic ring 21 are coaxially aligned, and their corresponding areas are set with the same magnetic poles to form a radial magnetic coupling field where the like magnetic poles repel each other. The separate sliding guide structure 123 is made of stainless steel. The magnetic drive slide 122 is installed on the transmission end 1231, and the execution end 1232 is fixedly assembled with the grinder 125 by bolts. It is staggered from the magnetic drive slide 122 along the axial direction to avoid magnetic interference.

[0053] The mechanical elastic preload assembly 124 uses a disc spring assembly, which is coaxially mounted between the actuator 1232 and the fixed boss 1212 of the circumferential rotating frame 121. Normally, it is in a pre-compressed state to provide a stable preload force. This preload force is balanced with the radial magnetic repulsion force on the magnetic drive slide 122 and is transmitted to the grinder 125 through the actuator 1232, so that the grinding head of the grinder 125 maintains a preset non-contact gap with the tube wall under normal conditions.

[0054] The pipe support drive unit 3 includes multiple sets of symmetrically arranged idlers. The surface of the idlers is covered with an elastic protective layer to stably support the MPP cable protection pipe to be processed and ensure the smoothness of the grinding process.

[0055] The central control unit uses a microcontroller as the main control chip, which is electrically connected to the drive motor 1112, the grinder 125, and the magnetic induction adjustment module of the movable magnetic ring 21. Parameter settings and operation status monitoring are realized through the touch screen. The pressure signal of the grinder 125 and the speed signal of the drive motor 1112 can be collected in real time. The magnetic induction intensity of the movable magnetic ring 21, the moving speed of the pipe centering moving frame 11, and the grinding pressure of the grinder 125 are automatically adjusted. When the increase in pipe wall thickness is detected, which weakens the magnetic coupling force, the pre-tightening force of the mechanical elastic pre-tightening component 124 pushes the grinding head of the grinder 125 to fit against the pipe wall to achieve adaptive grinding.

[0056] When using the MPP cable protection pipe production and processing equipment of this embodiment, firstly, according to the pipe diameter of the MPP cable protection pipe to be processed, select a movable magnetic ring 21 with appropriate specifications, adjust the extension length of the magnetic column 1131 of the main shaft magnetic traction structure 113, and ensure that the permanent magnet chuck 1132 and the inner ring adsorption area of ​​the movable magnetic ring 21 are precisely aligned.

[0057] Then, the MPP cable protection pipe to be processed is placed on the roller of the pipe support drive unit 3, the equipment is started, the central control unit controls the operation of each drive motor 1112, which drives the central moving frame 11 inside the pipe to move axially. At the same time, the main shaft magnetic traction structure 113 drives the movable magnetic ring 21 to move synchronously. The radial magnetic coupling field formed by the magnetic drive slide 122 and the movable magnetic ring 21 is balanced with the pre-tightening force of the mechanical elastic pre-tightening component 124, so that the grinding head of the grinding machine 125 maintains a preset non-contact gap with the pipe wall under normal conditions.

[0058] When encountering areas with thicker pipe walls, the magnetic coupling force weakens, and the pre-tightening force pushes the grinding head of the grinding machine 125 to fit against the pipe wall for grinding. After grinding is completed, the equipment automatically stops and the processed MPP cable protection pipe is removed.

[0059] A method for using an MPP cable protection pipe manufacturing and processing equipment includes the following steps:

[0060] S1. Equipment debugging preparation: According to the pipe diameter specifications of the MPP cable protection pipe to be processed, select the movable magnetic ring 21 with the corresponding inner diameter and install it in the preset position on the outer wall of the pipe, so that the permanent magnet suction cup 1132 at the end of the magnetic suction column 1131 is precisely aligned with the inner ring adsorption area of ​​the movable magnetic ring 21, so as to ensure that the opposite magnetic poles of the two can form a stable magnetic attraction traction link.

[0061] S2. Workpiece Placement and Positioning: Place the MPP cable protection pipe to be ground stably on the rollers of the pipe support drive unit 3, adjust the roller spacing to match the pipe length, and ensure that the pipe is placed upright and stable without any deviation or shaking, so as to provide a foundation for subsequent stable grinding.

[0062] S3, Parameter preset start: Parameters are preset via the touch screen of the central control unit, including the axial movement speed of the tube centering moving frame 11, the initial grinding speed of the grinder 125, the grinding pressure threshold, and the initial magnetic intensity of the movable magnetic ring 21.

[0063] After the parameters are set, turn on the main power switch of the equipment. The central control unit will then start each drive motor 1112 and related components simultaneously.

[0064] S4. Synchronous movement and dynamic balance establishment: The drive motor 1112 drives the central moving frame 11 inside the tube to move at a constant speed along the axial direction of the tube, while the main shaft magnetic traction structure 113 drives the movable magnetic ring 21 to move synchronously through magnetic attraction.

[0065] The magnetic drive slide 122 and the same-named magnetic poles of the movable magnetic ring 21 form a radial magnetic coupling repulsion force, which forms a dynamic balance with the pre-tightening force of the mechanical elastic pre-tightening component 124, so that the grinding head of the grinder 125 maintains a preset non-contact gap with the pipe wall.

[0066] S5. Wall thickness recognition and adaptive grinding: During the movement of the equipment, when the grinding machine 125 passes through the area where the pipe wall thickness increases, the distance between the pipe wall and the movable magnetic ring 21 and the magnetic drive slide 122 is shortened, the magnetic coupling repulsion is weakened, and the pre-tightening force of the mechanical elastic pre-tightening component 124 pushes the execution end 1232 to move towards the pipe wall side, thereby driving the grinding machine 125 to move synchronously, so that the grinding head fits the pipe wall and maintains the appropriate grinding pressure for grinding;

[0067] When passing through the area where the pipe wall thickness is reduced, the magnetic coupling repulsion increases, pushing the magnetic drive slide 122-transmission end 1231-execution end 1232 to move away from the pipe wall, compressing the disc spring assembly. At this time, the spring preload increases in the opposite direction, still ensuring that the grinder 125 is in contact with the pipe wall through the execution end 1232, realizing automatic identification of wall thickness differences and adaptive grinding throughout the process.

[0068] S6. Real-time monitoring and parameter fine-tuning: The central control unit collects the pressure signal of the grinder 125 and the speed signal of the drive motor 1112 in real time. If the grinding pressure exceeds the preset threshold or the moving speed is abnormal, the magnetic intensity of the movable magnetic ring 21 and the moving speed of the central moving frame 11 in the tube will be automatically adjusted to ensure that the grinding process is stable and the grinding quality meets the standards.

[0069] S7. Grinding completed and equipment stopped: After the central moving frame 11 inside the pipe drives the grinding machine 125 to complete the grinding stroke of the entire pipe, the central control unit issues a stop command, and each drive motor 1112, grinding machine 125 and magnetic control component stop working.

[0070] After the equipment has come to a complete stop, remove the polished MPP cable protection tube, turn off the main switch of the equipment, and the polishing operation is complete.

[0071] 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 preferred examples and are not intended to limit 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 the present invention is defined by the appended claims and their equivalents.

Claims

1. An MPP cable protection pipe manufacturing and processing equipment, characterized in that, It includes an internal adaptive grinding unit (1), an external magnetic positioning unit (2), and a pipe support drive unit (3). The tube-in-adaptive grinding unit (1) includes a tube-in-center moving frame (11) and a magnetically controlled grinding component (12). The tube-in-center moving frame (11) is kept in the tube-in-center state by a circumferential spring leg (111). The magnetically controlled grinding component (12) is evenly arranged circumferentially along the tube-in-center moving frame (11). The outer wall magnetic positioning unit (2) includes a movable magnetic ring (21) sleeved on the outer wall of the pipe, and the movable magnetic ring (21) forms a stable magnetic coupling with the magnetic grinding assembly (12); Under normal conditions, the grinding head of the magnetic grinding assembly (12) maintains a preset non-contact gap with the pipe wall. When the pipe wall is thick and the magnetic coupling force is weakened, the magnetic grinding assembly (12) drives the grinding head to fit against the pipe wall to achieve adaptive grinding.

2. The MPP cable protection pipe production and processing equipment according to claim 1, characterized in that: The tube-centered movable frame (11) includes a central host (112), circumferential spring legs (111) and a main shaft magnetic traction structure (113). Several circumferential spring legs (111) are evenly distributed around the central host (112). The end of the circumferential spring leg (111) away from the central host (112) is integrated with a roller (1111), and at least two circumferential spring legs (111) are equipped with drive motors (1112). The drive motors (1112) provide power for the axial movement of the tube centering moving frame (11). The elastic force of the circumferential spring legs (111) keeps the rollers (1111) in contact with the tube wall, ensuring that the tube centering moving frame (11) is centered in the tube.

3. The MPP cable protection pipe production and processing equipment according to claim 2, characterized in that: The main shaft magnetic traction structure (113) includes three sets of radially extending magnetic columns (1131) evenly arranged along the front end of the central host (112), and permanent magnet chucks (1132) are assembled at the ends of the magnetic columns (1131) away from the central host (112). The circumferential distribution trajectory of each permanent magnet chuck (1132) is precisely matched with the inner ring adsorption area of ​​the movable magnetic ring (21), and the corresponding magnetic poles of the permanent magnet chuck (1132) and the movable magnetic ring (21) are set to have different names. A stable traction link is formed through multi-point distributed magnetic attraction force, so as to realize the synchronous axial movement of the central host (112) and the movable magnetic ring (21).

4. The MPP cable protection pipe production and processing equipment according to claim 1, characterized in that: The movable magnetic ring (21) is an integrated encapsulated ring electromagnetic structure with rolling wheels (22) evenly arranged on its inner circumference. The rolling wheels (22) roll with the outer wall of the pipe to achieve radial limiting, ensuring that the movable magnetic ring (21) remains coaxial with the pipe during movement and reducing axial movement resistance. A fully closed magnetic ring (213) is embedded inside the movable magnetic ring (21) to generate a uniform magnetic repulsion force in the ring shape of the movable magnetic ring (21).

5. The MPP cable protection pipe production and processing equipment according to claim 1, characterized in that: The magnetically controlled grinding assembly (12) includes a circumferential rotating frame (121), a magnetically driven slide (122), a separate sliding guide structure (123), a mechanically elastic pre-tightening assembly (124), and a grinding machine (125). The circumferential rotating frame (121) is mounted on the outside of the central host (112) via bearings, and its outer ring has a pre-set radial guide groove (1211), and the magnetic drive slide (122) is embedded in the radial guide groove (1211); The magnetically controlled grinding assembly (12) is equipped with a micro servo motor (126). The micro servo motor (126) is used to drive the circumferential rotating frame (121) to rotate around the central host (112), thereby driving the magnetic drive slide (122) embedded in the slide groove to rotate synchronously in the circumferential direction. At the same time, the magnetic drive slide (122) can slide along the radial guide slide (1211). The magnetic drive slide (122) and the movable magnetic ring (21) are coaxially aligned and arranged with the same magnetic poles facing each other to form a stable radial magnetic coupling field.

6. The MPP cable protection pipe production and processing equipment according to claim 1, characterized in that: The split sliding guide structure (123) includes a transmission end (1231) and an execution end (1232). The magnetic drive slide (122) is installed on the transmission end (1231), and the execution end (1232) is fixedly assembled with the grinder (125). The split sliding guide structure (123) offsets the installation position of the grinder (125) from the magnetic induction position of the magnetic drive slide (122) along the axial direction, so as to avoid the magnetic force directly affecting the working stability of the grinder (125); The split sliding guide structure (123) forms a precise radial sliding constraint on the grinder (125), ensuring that the grinder (125) only extends or retracts radially near or away from the pipe wall.

7. The MPP cable protection pipe production and processing equipment according to claim 1, characterized in that: The mechanical elastic preload assembly (124) is a disc spring assembly, coaxially mounted between the actuator end (1232) and the fixed boss (1212) of the circumferential rotating frame (121); The disc spring assembly is normally in a pre-compressed state, providing a continuous pre-tightening force toward the pipe wall to the actuator (1232); The preload force is in opposite balance with the radial magnetic repulsion force on the magnetic drive slide (122), and is directly transmitted to the grinder (125) through the actuator (1232), so that the grinder (125) can adaptively adjust its position as the actuator (1232) moves radially, and always maintains a grinding state that fits the pipe wall, dynamically controlling the grinding fit force.

8. The MPP cable protection pipe production and processing equipment according to claim 1, characterized in that: The pipe support drive unit (3) includes several sets of symmetrically arranged rollers. The surface of the rollers is covered with an elastic protective layer to support the MPP cable protection pipe to be processed and ensure the stability of the grinding process.

9. A method of using an MPP cable protection pipe production and processing equipment, comprising using an MPP cable protection pipe production and processing equipment as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. The drive motor (1112) of the tube centering moving frame (11) is started, which drives the tube centering moving frame (11) to move along the tube axis. At the same time, the movable magnetic ring (21) is driven to move synchronously axially through the main shaft magnetic traction structure (113). S2, the magnetic drive slide (122) and the movable magnetic ring (21) form a radial magnetic coupling repulsion force, which is dynamically balanced with the pre-tightening force of the mechanical elastic pre-tightening component (124), so that the grinding head of the grinder (125) normally maintains a preset non-contact gap; S3. When encountering differences in pipe wall thickness, the magnetic coupling repulsion force is adaptively adjusted with the change in wall thickness. The grinding machine (125) is driven to extend and retract radially through the split sliding guide structure (123) to achieve adaptive grinding of the inner wall of the pipe.

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