Rapid polishing and grinding assembly for inner wall of MPP pipe

Abstract

The utility model relates to the technical field of MPP pipe machining, in particular to an MPP pipe inner wall fast polishing and grinding assembly which comprises a base, an installation support is arranged at the top of the base and close to the left side, a motor is installed at the top of the installation support through bolts, and a fixing vertical plate is arranged at the top of the base and close to the right side of the installation support. The right side of the fixed vertical plate is rotationally connected with a rotating transverse rod through a bearing, an output shaft of the motor is coaxially connected with the rotating transverse rod, the right end of the rotating transverse rod is detachably connected with a polishing and grinding assembly, a guide assembly is arranged on the top of the base, and a moving assembly is arranged on the guide assembly. According to the rapid polishing and grinding assembly for the inner wall of the MPP pipe, through the replaceable polishing and grinding assembly and the adjustable moving assembly, the rapid polishing and grinding assembly can adapt to MPP pipes of various specifications, and the problem that the application range of a traditional device is limited due to a fixed structure is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to MPP pipe processing technical field, concretely is a kind of MPP pipe inner wall quick polishing subassembly. BACKGROUND

[0002] MPP pipe, i.e. modified polypropylene pipe, is a kind of pipe material made of modified polypropylene as main material, due to its excellent corrosion resistance, light weight, high strength and good compression resistance, it is widely used as power cable protection sleeve and other scenes. In power engineering, MPP pipe needs to have high-precision inner wall smoothness to ensure the smoothness of cable laying and reduce the abrasion risk of insulation layer caused by friction in long-term use. However, in the production process, burrs, impurities or processing marks are easily left on the inner wall of MPP pipe, which may directly affect the efficiency of cable threading and the long-term protection performance of the pipeline. Therefore, inner wall polishing treatment becomes a key process of MPP pipe production: by removing the inner surface defects, the smoothness of the pipeline is improved, which can significantly reduce the friction resistance between the cable and the pipe wall, so as to meet the stringent requirements of power engineering for high-quality pipe materials.

[0003] The patent with publication number CN220408109U discloses a kind of pipe class piece inner wall polishing device, including electric grinder, limit board and sliding block, limit board includes first limit board and second limit board, first limit board and second limit board between being provided with slide rail, sliding block is set on slide rail, and sliding block is moved along slide rail, pipe class piece product is placed on the top of sliding block, the grinding head of electric grinder corresponds with pipe class piece product, and several abrasive blocks are uniformly distributed in the circumferential direction of grinding head. The utility model has low manufacturing cost, and the smoothness of product inner wall is easy to guarantee, and it is safe and convenient to operate.

[0004] Although the above-mentioned prior art can polish the inner wall of pipe class piece product, one of the significant limitations of the prior art is that the design of the sliding block limits the polishing device to be applicable only to the same model of pipe class piece product, and lacks adjustable structure to adapt to pipe class piece products of different pipe diameters. The limitation of such design makes it impossible to flexibly cope with various specifications of MPP pipe, affecting the use range and efficiency of the equipment. In view of this, we propose a kind of MPP pipe inner wall quick polishing subassembly, which aims to overcome the shortcomings of the prior art by optimizing the design and enhancing the adaptability, so as to realize a more efficient and convenient inner wall polishing solution. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of MPP pipe inner wall quick polishing subassembly to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of MPP pipe inner wall quick polishing assembly, including base, for supporting and fixed other components, the top of the base and the position close to left side is equipped with mounting bracket, for fixed motor, the top of the mounting bracket is equipped with motor by bolt, external power supply works, provide rotating power drive polishing assembly work, the top of the base and the position close to mounting bracket right side is equipped with fixed vertical plate, rotating cross bar is supported by bearing and ensure its stable rotation, the right side of the fixed vertical plate is rotatably connected with rotating cross bar by bearing, motor power is transmitted to polishing assembly, the output shaft of the motor is coaxially connected with rotating cross bar, the right end of the rotating cross bar is detachably connected with polishing assembly, for the polishing processing of MPP pipe inner wall, polishing assembly can be replaced, to adapt to the MPP pipe of different pipe diameter, so that the opposite side of two polishing blocks can be attached with the inner wall of MPP pipe;

[0008] The polishing assembly includes a circular sleeve block that is sleeved on the right end of the rotating cross bar, allowing the polishing assembly to be quickly disassembled and assembled with the rotating cross bar. The outer wall of the circular sleeve block is provided with two rectangular tubes arranged symmetrically above and below. Two rectangular mounting blocks are arranged in the two rectangular tubes. The opposite sides of the two rectangular mounting blocks are each provided with a polishing block that directly contacts and grinds the inner wall of the MPP pipe. The polishing block is fixed with the rectangular tube through the rectangular mounting block. When the polishing block needs to be replaced, the rectangular mounting block in the rectangular tube is disassembled, and then the rectangular mounting block on the new polishing block is installed with the rectangular tube.

[0009] The top of the base is provided with a guide assembly for guiding the horizontal movement of the moving assembly to adapt to MPP pipes of different lengths. The guide assembly is provided with a moving assembly for clamping and adjusting the position and height of the MPP pipe. The moving assembly includes a moving seat that carries a lifting adjusting member and a support cross plate. The middle part of the top of the moving seat is provided with a lifting adjusting member for adjusting the height of the support cross plate to match the center line of the polishing assembly. The height of the support cross plate is adjusted through the lifting adjusting member, thereby adjusting the height of the MPP pipe to match the height of the polishing assembly, ensuring that the polishing assembly can enter the MPP pipe.

[0010] The top of the lifting adjusting member is provided with a support cross plate for fixing the first and second V-shaped clamping plates to clamp the MPP pipe. The top of the support cross plate and the positions close to the left and right sides are each provided with a first V-shaped clamping plate for clamping the MPP pipe from the bottom to prevent horizontal deviation. The middle part of the rear side of the support cross plate is provided with a U-shaped bracket for supporting a threaded compression rod and a moving plate. The top of the U-shaped bracket is threadedly connected with a threaded compression rod for driving the second V-shaped clamping plate to compress the MPP pipe by rotating. The bottom end of the threaded compression rod is rotatably connected with a moving plate for transmitting the compression force of the threaded compression rod to the second V-shaped clamping plate. The bottom of the moving plate is provided with a second V-shaped clamping plate that cooperates with the first V-shaped clamping plate to form a three-point positioning clamping.

[0011] Preferably, the right side of the circular sleeve block is provided with a mounting hole a in the middle, through which a locking bolt is arranged to fix the circular sleeve block, the mounting hole a is connected with the locking bolt, the right end of the rotating horizontal rod is provided with a first threaded groove for screwing the locking bolt, and the locking bolt locks the assembly position of the circular sleeve block and the rotating horizontal rod.

[0012] Preferably, the front side of the rectangular pipe is provided with a mounting hole b, through which a fixing screw is arranged to fix the rectangular mounting block, the mounting hole b is connected with the fixing screw, the front side of the rectangular mounting block is provided with a second threaded groove for screwing the fixing screw, and the fixing screw locks the position of the rectangular mounting block.

[0013] Preferably, the guide assembly comprises two fixed side plates arranged in left-right symmetry, which are fixed on the base to support the guide rails and the guide horizontal rod, the bottom of the fixed side plate is bolted to the top of the base, and two guide rails arranged in front-rear symmetry are arranged between the two fixed side plates and at the bottom to provide sliding tracks for the rollers of the moving seat.

[0014] Preferably, the bottom of the moving seat is provided with rollers near the four corners, the front two rollers roll on the front guide rail, and the rear two rollers roll on the rear guide rail, thereby reducing the moving resistance.

[0015] Preferably, the guide horizontal rod is arranged between the two fixed side plates and near the top to limit the lateral deviation of the moving seat, the middle of the bottom of the moving seat is provided with a sliding block, the sliding block is slidingly connected to the outer side of the guide horizontal rod, and the sliding block slides along the guide horizontal rod to keep the moving direction stable.

[0016] Preferably, the top of the moving seat is provided with a circular vertical pipe near the left and right sides, which is sleeved with a positioning vertical rod to limit the inclination of the supporting horizontal plate, the bottom of the supporting horizontal plate is provided with two positioning vertical rods, and the positioning vertical rods are sleeved in the circular vertical pipe, so that the insertion of the positioning vertical rods into the circular vertical pipe ensures the vertical lifting of the supporting horizontal plate.

[0017] Preferably, the lifting adjusting member comprises a rectangular vertical pipe fixedly connected to the top of the moving seat, which accommodates the matrix support rod and limits its moving direction, the rectangular vertical pipe is sleeved with the matrix support rod, the top of the matrix support rod is fixedly connected to the middle of the bottom of the supporting horizontal plate, the four sides of the rectangular vertical pipe are threadedly connected with compression bolts near the top, the threaded end of the compression bolt abuts against the outer side of the matrix support rod, and the matrix support rod is compressed to lock the height of the supporting horizontal plate.

[0018] Preferably, the top of the moving plate is provided with two limiting rods arranged in left-right symmetry, the top end of the limiting rod penetrates through the top of the inner wall of the U-shaped support to the outside, thereby preventing the rotation or inclination of the moving plate.

[0019] Preferably, the second V-shaped clamp is located directly above the supporting cross plate and between the two first V-shaped clamps. The concave surface of the first V-shaped clamp is bonded with a first rubber liner, and the concave surface of the second V-shaped clamp is bonded with a second rubber liner, which increases friction and prevents damage to the surface of the MPP tube.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This MPP pipe inner wall rapid polishing assembly, with its replaceable polishing components and adjustable moving components, can be adapted to various specifications of MPP pipes, solving the problem of limited applicability caused by the fixed structure of traditional devices.

[0022] 2. The MPP pipe inner wall rapid polishing assembly adopts symmetrical polishing blocks that rotate under the drive of a motor. It can uniformly grind burrs and impurities on the inner wall of the MPP pipe, significantly improving the smoothness of the inner wall and reducing the frictional resistance during cable laying.

[0023] 3. The MPP pipe inner wall rapid polishing assembly forms a three-point positioning clamping structure through the cooperation of the first V-shaped clamp, the second V-shaped clamp, and the rubber liner. This ensures the stability of the MPP pipe during the polishing process and avoids damage to the pipe surface caused by excessive clamping force.

[0024] 4. The MPP tube inner wall rapid polishing assembly has a height adjustment component that achieves fine adjustment through matrix support rods and clamping bolts. Combined with the sliding design of guide rails and rollers, it can quickly adjust the alignment accuracy between the MPP tube and the polishing assembly, greatly improving processing efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the assembly structure of the rotating crossbar and polishing assembly in this utility model;

[0027] Figure 3 This is a schematic diagram of the assembly structure of the guide component and the moving component in this utility model;

[0028] Figure 4 This is a schematic diagram of the mobile component structure in this utility model;

[0029] In the figure: 1, base; 10, fixed vertical plate; 2, mounting bracket; 3, motor; 4, rotating cross rod; 40, first threaded groove; 5, polishing assembly; 50, circular sleeve block; 500, mounting hole a; 51, locking bolt; 52, rectangular tube; 520, mounting hole b; 53, rectangular mounting block; 530, second threaded groove; 54, polishing block; 55, fixing screw; 6, guide assembly; 60, fixed side plate; 61, guide rail; 62, guide cross rod; 7, moving assembly; 70, moving seat; 700, circular vertical pipe; 71, roller; 72, sliding block; 73, lifting adjusting piece; 730, rectangular vertical pipe; 731, matrix support rod; 732, pressing bolt; 74, support cross plate; 740, positioning vertical rod; 75, first V-shaped clamping plate; 750, first rubber lining; 76, U-shaped support; 77, threaded pressing rod; 78, moving plate; 780, limiting rod; 79, second V-shaped clamping plate; 790, second rubber lining. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] Please refer to Figures 1-4 The present application provides a technical solution:

[0033] The utility model provides a kind of MPP pipe inner wall quick polishing assembly, including base 1, for supporting and fixed other components, the top of base 1 and the position close to left side is equipped with mounting bracket 2, for fixed motor 3, the top of mounting bracket 2 is bolted with motor 3, external power supply works, provides rotating power drive polishing assembly 5 work, the top of base 1 and the position close to mounting bracket 2 right side is equipped with fixed vertical plate 10, rotating cross bar 4 is supported by bearing and is ensured stable rotation, the right side of fixed vertical plate 10 is rotatably connected with rotating cross bar 4 by bearing, motor 3 power is transmitted to polishing assembly 5, the output shaft of motor 3 is coaxially connected with rotating cross bar 4, the right end of rotating cross bar 4 is detachably connected with polishing assembly 5, for polishing processing to MPP pipe inner wall, polishing assembly 5 can be replaced, to adapt to the MPP pipe of different pipe diameter, so that the opposite side of two polishing blocks 54 can be pasted with the inner wall of MPP pipe;

[0034] Polishing assembly 5 includes circular sleeve block 50 sleeved on the right end of rotating cross bar 4, to realize quick disassembly and assembly of polishing assembly 5 and rotating cross bar 4, the outer wall of circular sleeve block 50 is equipped with two rectangular tubes 52, which are symmetrically arranged above and below, two rectangular tubes 52 are equipped with rectangular mounting blocks 53, the opposite side of two rectangular mounting blocks 53 is equipped with polishing block 54, which directly contacts and grinds MPP pipe inner wall, polishing block 54 is fixed by rectangular mounting block 53 and rectangular tube 52, when polishing block 54 needs to be replaced, rectangular mounting block 53 is disassembled from rectangular tube 52, then the rectangular mounting block 53 on the new polishing block 54 is installed with rectangular tube 52;

[0035] The top of base 1 is equipped with guide assembly 6, to guide horizontal movement of moving assembly 7 to adapt to MPP pipe of different lengths, moving assembly 7 is arranged on guide assembly 6, for clamping and adjusting the position and height of MPP pipe, moving assembly 7 includes moving seat 70, carries lifting adjusting part 73 and support cross plate 74, the middle part of the top of moving seat 70 is equipped with lifting adjusting part 73, the height of support cross plate 74 is adjusted to match the center line of polishing assembly 5, the height of support cross plate 74 is adjusted by lifting adjusting part 73, so as to adjust the height of MPP pipe, so that the height of MPP pipe is adapted to the height of polishing assembly 5, ensure that polishing assembly 5 can enter MPP pipe;

[0036] The top of the lifting adjusting piece 73 is provided with a support transverse plate 74 for fixing the first V-shaped clamping plate 75 and the second V-shaped clamping plate 79 to clamp the MPP pipe, the top of the support transverse plate 74 and near the left and right sides are provided with the first V-shaped clamping plate 75, which clamps the MPP pipe from the bottom to prevent horizontal deviation, the middle of the rear side of the support transverse plate 74 is provided with a U-shaped support 76 for supporting the threaded pressing rod 77 and the moving plate 78, the top of the U-shaped support 76 is threadedly connected with the threaded pressing rod 77, the threaded pressing rod 77 is rotated to drive the second V-shaped clamping plate 79 to press the MPP pipe, the bottom end of the threaded pressing rod 77 is rotatably connected with the moving plate 78, the moving plate 78 transmits the pressure of the threaded pressing rod 77 to the second V-shaped clamping plate 79, and the bottom of the moving plate 78 is provided with the second V-shaped clamping plate 79, which cooperates with the first V-shaped clamping plate 75 to form three-point positioning clamping.

[0037] In the embodiment, the middle of the right side of the circular sleeve block 50 is provided with a mounting hole a500 for the locking bolt 51 to pass through to fix the circular sleeve block 50, the mounting hole a500 is connected with the locking bolt 51, the right end of the rotating cross bar 4 is provided with a first threaded groove 40 for threadedly connecting the locking bolt 51, and the locking bolt 51 locks the assembly position of the circular sleeve block 50 and the rotating cross bar 4.

[0038] Specifically, the front side of the rectangular pipe 52 is provided with a mounting hole b520 for the fixing screw 55 to pass through to fix the rectangular mounting block 53, the mounting hole b520 is connected with the fixing screw 55, the front side of the rectangular mounting block 53 is provided with a second threaded groove 530 for threadedly connecting the fixing screw 55, and the fixing screw 55 locks the position of the rectangular mounting block 53.

[0039] Further, the guide assembly 6 comprises two fixed side plates 60 arranged symmetrically left and right, which are fixed on the base 1 to support the guide rails 61 and the guide cross bars 62, the bottom of the fixed side plate 60 is bolted to the top of the base 1, and two guide rails 61 arranged symmetrically front and back are arranged between the two fixed side plates 60 and at the bottom, providing sliding tracks for the rollers 71 of the moving seat 70.

[0040] Further, the bottom of the moving seat 70 and near the four corners are provided with rollers 71, the front two rollers 71 roll on the front guide rails 61, and the rear two rollers 71 roll on the rear guide rails 61, rolling along the guide rails 61 to reduce the moving resistance.

[0041] Further, the guide cross bars 62 are arranged between the two fixed side plates 60 and near the top to limit the lateral deviation of the moving seat 70, and the middle of the bottom of the moving seat 70 is provided with a sliding block 72 which is slidingly connected to the outside of the guide cross bar 62, and the sliding block 72 slides along the guide cross bar 62 to keep the moving direction stable.

[0042] Further, the top of the moving seat 70 and the positions close to the left and right sides are provided with circular vertical pipes 700, which are sleeved with positioning vertical rods 740 to limit the inclination of the supporting horizontal plate 74. The bottom of the supporting horizontal plate 74 is provided with two positioning vertical rods 740, which are sleeved in the circular vertical pipes 700. The insertion of the positioning vertical rods 740 into the circular vertical pipes 700 ensures the vertical lifting of the supporting horizontal plate 74.

[0043] Further, the lifting adjusting part 73 comprises a rectangular vertical pipe 730 fixedly connected to the top of the moving seat 70, which contains the matrix support rod 731 and limits the moving direction thereof. The rectangular vertical pipe 730 is sleeved with the matrix support rod 731. The top of the matrix support rod 731 is fixedly connected to the middle of the bottom of the supporting horizontal plate 74. The four sides of the rectangular vertical pipe 730 and the positions close to the top are threadedly connected with the pressing bolts 732. The threaded ends of the pressing bolts 732 abut against the outer side of the matrix support rod 731, which presses the matrix support rod 731 to lock the height of the supporting horizontal plate 74.

[0044] Further, the top of the moving plate 78 is provided with two limiting rods 780 arranged in a left-right symmetry. The top ends of the limiting rods 780 pass through the top of the inner wall of the U-shaped support 76 to the outside, which prevents the rotation or inclination of the moving plate 78.

[0045] Further, the second V-shaped clamping plate 79 is located directly above the supporting horizontal plate 74 and between the two first V-shaped clamping plates 75. The concave surface of the first V-shaped clamping plate 75 is bonded with the first rubber lining 750. The concave surface of the second V-shaped clamping plate 79 is bonded with the second rubber lining 790, which increases the friction and prevents the crushing of the surface of the MPP pipe.

[0046] In use, the MPP pipe is placed on the supporting horizontal plate 74 of the moving assembly 7. The rotating threaded pressing rod 77 drives the moving plate 78 to drive the second V-shaped clamping plate 79 to press down, which cooperates with the first V-shaped clamping plate 75 on the supporting horizontal plate 74 to clamp the MPP pipe by the first rubber lining 750 and the second rubber lining 790. According to the pipe diameter of the MPP pipe, the corresponding polishing assembly 5 is selected. The circular sleeve block 50 is sleeved on the right end of the rotating horizontal rod 4 and is fixed by the locking bolt 51 and the first threaded groove 40. The height of the matrix support rod 731 of the lifting adjusting part 73 is adjusted so that the central axis of the MPP pipe on the supporting horizontal plate 74 is aligned with the rotating horizontal rod 4. Then, the height is locked by tightening the pressing bolt 732. The motor 3 is started to drive the rotating horizontal rod 4 to rotate the polishing assembly 5 and to push the moving seat 70 to move horizontally along the guide rail 61 and the guide horizontal rod 62, so that the polishing blocks 54 uniformly contact the inner wall of the MPP pipe for polishing. After polishing, the motor 3 is turned off, the threaded pressing rod 77 is loosened, and the MPP pipe is removed. When another specification of MPP pipe is replaced, the above steps are repeated and the appropriate polishing assembly 5 is replaced.

[0047] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A MPP pipe inner wall rapid polishing assembly, comprising a base, characterized in that: The top of the base is provided with a mounting bracket near the left side, the top of the mounting bracket is provided with a motor through bolts, the top of the base is provided with a fixed vertical plate near the right side of the mounting bracket, the right side of the fixed vertical plate is rotatably connected with a rotating cross bar through a bearing, the output shaft of the motor is coaxially connected with the rotating cross bar, the right end of the rotating cross bar is detachably connected with a polishing assembly, the polishing assembly comprises a circular sleeve block sleeved on the right end of the rotating cross bar, the outer wall of the circular sleeve block is provided with two rectangular pipes which are symmetrically arranged above and below, two rectangular mounting blocks are arranged in the two rectangular pipes, polishing blocks are arranged on the opposite sides of the two rectangular mounting blocks, the top of the base is provided with a guide assembly, the guide assembly is provided with a moving assembly, the moving assembly comprises a moving seat, the middle part of the top of the moving seat is provided with a lifting adjusting piece, the top of the lifting adjusting piece is provided with a supporting cross plate, the top of the supporting cross plate is provided with a first V-shaped clamping plate near the left and right sides, the middle part of the rear side of the supporting cross plate is provided with a U-shaped support, the top of the U-shaped support is threadedly connected with a threaded pressing rod, the bottom end of the threaded pressing rod is rotatably connected with a moving plate, and the bottom of the moving plate is provided with a second V-shaped clamping plate.

2. The MPP tube inner wall fast polishing assembly according to claim 1, characterized in that: The middle part of the right side of the circular sleeve block is provided with a mounting hole a, the mounting hole a is connected with a locking bolt, and the right end of the rotating cross bar is provided with a first threaded groove for threadedly connecting the locking bolt.

3. The MPP tube inner wall fast polishing assembly according to claim 1, characterized in that: The front side of the rectangular pipe is provided with a mounting hole b, the mounting hole b is connected with a fixing screw, and the front side of the rectangular mounting block is provided with a second threaded groove for threadedly connecting the fixing screw.

4. The MPP tube inner wall fast polishing assembly according to claim 1, characterized in that: The guide assembly comprises two fixed side plates which are symmetrically arranged left and right, the bottom of the fixed side plate is bolted to the top of the base, and two guide rails which are symmetrically arranged front and back are arranged between the two fixed side plates and at the bottom.

5. The MPP tube inner wall fast polishing assembly according to claim 4, characterized in that: The bottom of the moving seat is provided with rollers near the four corners, the front two rollers roll on the front guide rail, and the rear two rollers roll on the rear guide rail.

6. The MPP tube inner wall fast polishing assembly according to claim 4, characterized in that: The middle part of the bottom of the moving seat is provided with a sliding block which is slidably connected to the outer side of the guide cross bar.

7. The MPP tube inner wall fast polishing assembly according to claim 1, characterized in that: The top of the moving seat is provided with a circular vertical pipe near the left and right sides, and the bottom of the supporting cross plate is provided with two positioning vertical rods which are sleeved in the circular vertical pipe.

8. The MPP tube inner wall fast polishing assembly according to claim 1, characterized in that: The lifting adjusting piece comprises a rectangular vertical pipe fixedly connected to the top of the moving seat, a matrix supporting rod is sleeved in the rectangular vertical pipe, the top of the matrix supporting rod is fixedly connected to the middle part of the bottom of the supporting cross plate, four sides of the rectangular vertical pipe are threadedly connected with pressing bolts near the top, and the threaded end of the pressing bolt abuts against the outer side of the matrix supporting rod.

9. The MPP tube inner wall fast polishing assembly according to claim 1, characterized in that: The top of the moving plate is provided with two limiting rods which are symmetrically arranged left and right, and the top end of the limiting rod penetrates through the top of the inner wall of the U-shaped support to the outside.

10. The MPP tube inner wall fast polishing assembly according to claim 1, characterized in that: The second V-shaped clamping plate is located directly above the support transverse plate, and is located between two first V-shaped clamping plates, and the concave surface of the first V-shaped clamping plate is bonded with a first rubber inner lining, and the concave surface of the second V-shaped clamping plate is bonded with a second rubber inner lining.

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