Inner hole electromagnetic polishing process and equipment

Abstract

The present invention discloses an inner hole electromagnetic polishing device, comprising a base, a lower bracket connected to the top of the base, an adjustment mechanism connected to one side of the lower bracket, a polishing cylinder connected to one side of the adjustment mechanism, a cylinder 1 connected to the outer surface of the polishing cylinder, an output end of the cylinder 1 extending through the polishing cylinder and connected to a clamping plate, a driving mechanism connected to the top of the base, an electromagnetic suction cup connected to one side of the inner wall of the polishing cylinder, a turntable connected to the top of the lower bracket, a rack provided on the inner side of the turntable, a servo motor connected to one side of the lower bracket, a driving gear 2 connected to the output end of the servo motor, and one side of the driving gear 2 meshing with the rack. The present invention effectively ensures a polishing effect, can perform polishing processing on the inner holes of long pipes, ensures applicability, and ensures comprehensiveness of polishing the inner holes of pipes.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece polishing, in particular to an inner hole electromagnetic polishing process and equipment. Background Art

[0002] Electromagnetic polishing is a surface treatment technology used to improve the finish and glossiness of parts. It applies electromagnetic force and magnets to the surface of the workpiece, combines abrasives and abrasives, and performs grinding and polishing in a liquid medium to eliminate surface unevenness, oxide layers, pores and tiny defects to achieve higher smoothness and brightness.

[0003] The current electromagnetic polishing process cannot process the inner hole of longer pipes well during processing. It can only polish the outside of the pipe and the inside of the pipe. The polishing effect is poor, which affects the processing quality of the workpiece. Only direct polishing can be performed, which reduces the applicability. Therefore, an inner hole electromagnetic polishing process and equipment are proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide an inner hole electromagnetic polishing process and equipment to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: comprising a base, the top of the base is connected to a lower bracket, one side of the lower bracket is connected to an adjusting mechanism, one side of the adjusting mechanism is connected to a polishing cylinder, the outer surface of the polishing cylinder is connected to a cylinder 1, the output end of the cylinder 1 extends through and into the polishing cylinder and is connected to a splint, the top of the base is connected to a driving mechanism, one side of the inner wall of the polishing cylinder is connected to an electromagnetic suction cup, the top of the lower bracket is connected to a middle turntable, the inner side of the middle turntable is provided with a rack, one side of the lower bracket is connected to a servo motor, and the servo motor output The output end is connected with a driving gear 2, one side of the driving gear 2 is meshed with the rack, the top of the turntable is connected with an upper bracket, one side of the upper bracket is connected with a screw rod 1, the top of the screw rod 1 passes through the upper bracket and is connected with a reduction motor, one end of the polishing cylinder is connected with a connecting frame, the bottom end of the connecting frame is connected with a screw rod 2, the bottom end of the screw rod 2 is rotatably provided with a rotating tube, the outer ring of the rotating tube is rotatably provided with a polishing mechanism, the top of the polishing mechanism is respectively connected with a cylinder 2 and a cylinder 3, one end of the cylinder 2 is connected with an internal thread block, and one end of the cylinder 3 is connected with a roller.

[0006] Preferably, a sleeve is slidably provided at the bottom end of the polishing cylinder, a rubber top sealing plate is slidably provided at one side of the inner wall of the sleeve, and the bottom end of the rubber top sealing plate is connected to the driving mechanism.

[0007] Preferably, the driving mechanism includes a fixed shell, a stator coil is connected to one side of the inner wall of the fixed shell, a rotor is arranged to rotate inside the stator coil, a rotating shaft is slidably arranged on the top of the rotor, and the top of the rotating shaft is connected to the rubber top sealing plate.

[0008] Preferably, the adjustment mechanism includes a rotating frame and a driving motor, a circular shaft is connected to one side of the rotating frame, one end of the circular shaft passes through the lower bracket and is connected to a driven gear, the output end of the driving motor is connected to a driving gear 1, one side of the driving gear 1 is engaged with the driven gear, a bearing is connected to one side of the rotating frame, the polishing cylinder is connected and set in the bearing, and the bottom end of the driving motor is connected to a motor bracket.

[0009] Preferably, the top end of the base is connected with reinforcement ribs, and the motor bracket is connected between the reinforcement ribs.

[0010] Preferably, the polishing mechanism includes a polishing tube rack, a plurality of groups of polishing racks are slidably arranged on the inner wall of the polishing tube rack, and inductive coil racks are connected between the inner walls of the polishing tube racks.

[0011] Preferably, the polishing frame includes an inner seat, one side of the inner seat is connected to a rectangular slide rod, one end of the rectangular slide rod passes through the polishing tube frame and is connected to a polishing block.

[0012] Preferably, a sliding groove is provided on one side of the upper bracket corresponding to the screw rod, and guide rods are slidably provided on both sides of the connecting frame, and both ends of the guide rods are fixedly provided on both sides of the sliding groove.

[0013] An inner hole electromagnetic polishing process comprises the following steps:

[0014] Step 1: Place the polished pipe in the polishing cylinder. Each cylinder extends and pushes the clamping plate to clamp the pipe. Then start the drive motor to drive the driven gear to rotate through the driving gear, so that the rotating frame drives the polishing cylinder to rotate to a vertical state. In the vertical state, the sleeve slides downward to connect with the rubber top sealing plate, and the rubber top sealing plate seals the bottom end of the polishing cylinder.

[0015] Step 2: The reduction motor is started, and the connecting frame is driven downward by the screw rod until the polishing mechanism is inserted into the pipe. Then, the electromagnetic chuck is energized to generate magnetic force. Each polishing frame is attracted by the magnetic force and slides outward, so that the polishing block fits the inner wall of the pipe. Then, the stator coil is energized to generate a magnetic field, which makes the internal rotor rotate. The rotor drives the rotating shaft to rotate, and at the same time drives the rubber top sealing plate to rotate. The rubber top sealing plate drives the sleeve to rotate, and at the same time drives the polishing cylinder to rotate, so that the internal pipe rotates, and the inner wall of the pipe rubs against the polishing block for polishing.

[0016] Step 3: You can also inject polishing liquid into the polishing cylinder, insert the polishing mechanism into the pipe, energize the inductor coil frame to generate a magnetic field, then pour the polishing needle between the inside of the pipe and the polishing mechanism, and then start the driving mechanism to drive the polishing cylinder to rotate, so that the polishing liquid and polishing needle inside are stirred, and the inner hole of the pipe is polished with the help of magnetic field adsorption;

[0017] Step 4. After polishing is completed, take the polishing mechanism out of the pipe, start the servo motor, and drive the turntable to rotate through the active gear 2, thereby driving the polishing mechanism to rotate and change position, so that it is convenient to directly observe the polishing effect from above the polishing cylinder or take out the pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention can drive the polishing cylinder to rotate through a driving mechanism, and at the same time use the magnetic force generated by the electromagnetic chuck to make the rectangular slide stick to the inner wall of the pipe to perform polishing. Alternatively, the inductive coil frame can be directly used to generate a magnetic field. In conjunction with the rotation of the polishing cylinder, the inner wall of the pipe is polished using polishing liquid and a polishing needle, effectively ensuring the polishing effect. The inner hole of a long pipe can be polished to ensure applicability.

[0020] 2. The present invention also drives the polishing mechanism to rotate by magnetically adsorbing the polishing rack on the electromagnetic chuck. During the rotation, the second cylinder extends, causing the internal thread block to be threadedly connected to the second screw rod, thereby moving the polishing mechanism upward, thereby changing the polishing position of each polishing rack. When the polishing mechanism rises to a certain position, the second cylinder contracts, and the polishing mechanism slides down along the rotating tube to reset, thereby ensuring more comprehensive polishing and comprehensive polishing of the inner hole of the pipe.

[0021] 3. The present invention also starts the driving motor to drive the driven gear to rotate through the driving gear 1, so that the rotating frame drives the polishing cylinder to rotate to a vertical state, starts the servo motor, drives the turntable to rotate through the driving gear 2, and drives the polishing mechanism to rotate and change position, so that it is convenient to directly observe the polishing effect from above the polishing cylinder or take out the pipe fittings, which makes loading and unloading convenient and quick, and reduces manpower consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of an inner hole electromagnetic polishing process and equipment of the present invention;

[0023] Figure 2 This is a schematic diagram of the side cross-sectional structure of an inner hole electromagnetic polishing process and equipment of the present invention;

[0024] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0025] Figure 4 for Figure 2 The enlarged structural diagram of part B in the middle;

[0026] Figure 5 for Figure 2 The enlarged structural diagram of part C in the middle;

[0027] Figure 6 This is a schematic structural diagram of a polishing mechanism in an inner hole electromagnetic polishing device according to the present invention;

[0028] Figure 7 for Figure 6 The enlarged structural diagram of part D is shown in the figure.

[0029] In the figure: 1. Base; 2. Lower bracket; 3. Adjustment mechanism; 31. Rotating frame; 32. Circular shaft; 33. Driven gear; 34. Driving motor; 35. Driving gear 1; 36. Bearing; 4. Polishing cylinder; 5. Cylinder 1; 6. Clamp; 7. Driving mechanism; 71. Fixed housing; 72. Stator coil; 73. Rotor; 74. Rotating shaft; 8. Electromagnetic chuck; 9. Middle turntable; 10. Rack; 11. Servo motor; 12. Driving gear 2; 13. Upper Upper bracket; 14. Screw rod 1; 15. Reducer motor; 16. Connecting frame; 17. Screw rod 2; 18. Rotating tube; 19. Polishing mechanism; 191. Polishing tube rack; 192. Polishing rack; 193. Inductor coil rack; 1921. Inner seat; 1922. Rectangular slide bar; 1923. Polishing block; 20. Cylinder 2; 21. Internal thread block; 22. Cylinder 3; 23. Roller; 24. Rubber top sealing plate; 25. Sleeve; 26. Reinforcement rib; 27. Guide rod. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1-7The present invention provides a technical solution: it includes a base 1, the top of the base 1 is connected to a lower bracket 2, one side of the lower bracket 2 is connected to an adjusting mechanism 3, one side of the adjusting mechanism 3 is connected to a polishing cylinder 4, the outer surface of the polishing cylinder 4 is connected to a cylinder 5, the output end of the cylinder 5 extends through the polishing cylinder 4 and is connected to a splint 6, the top of the base 1 is connected to a driving mechanism 7, one side of the inner wall of the polishing cylinder 4 is connected to an electromagnetic suction cup 8, the top of the lower bracket 2 is connected to a turntable 9, the inner side of the turntable 9 is provided with a rack 10, one side of the lower bracket 2 is connected to a servo motor 11, and the output end of the servo motor 11 is connected to a driving gear 2 12. One side of the driving gear 2 12 is engaged with the rack 10. The top of the turntable 9 is connected to an upper bracket 13. One side of the upper bracket 13 is connected to a screw rod 14. The top of the screw rod 14 passes through the upper bracket 13 and is connected to a reduction motor 15. One end of the polishing cylinder 4 is connected to a connecting frame 16. The bottom end of the connecting frame 16 is connected to a screw rod 2 17. The bottom end of the screw rod 2 17 is rotatably provided with a rotating tube 18. The outer ring of the rotating tube 18 is rotatably provided with a polishing mechanism 19. The top of the polishing mechanism 19 is respectively connected to a cylinder 2 20 and a cylinder 3 22. One end of the cylinder 20 is connected to an internal thread block 21, and one end of the cylinder 3 22 is connected to a roller 23.

[0033] A sleeve 25 is slidingly provided at the bottom end of the polishing cylinder 4, and a rubber top sealing plate 24 is slidingly provided on one side of the inner wall of the sleeve 25. The bottom end of the rubber top sealing plate 24 is connected to the driving mechanism 7, wherein the rubber top sealing plate 24 is rectangular and its area is larger than the cross-section of the polishing cylinder 4, which is convenient for sealing the bottom end of the polishing cylinder 4. The upper end of the sleeve 25 is cylindrical and the lower end is rectangular, and the inner side is embedded with the outer side of the rubber top sealing plate 24. A limit strip is provided on the outer side of the polishing cylinder 4, and is slidably connected with the sleeve 25, which can effectively play a transmission effect. When the rubber top sealing plate 24 rotates, the polishing cylinder 4 can be driven to rotate by the sleeve 25.

[0034] The driving mechanism 7 includes a fixed shell 71, and a stator coil 72 is connected to one side of the inner wall of the fixed shell 71. A rotor 73 is arranged to rotate inside the stator coil 72. A rotating shaft 74 is slidingly arranged at the top of the rotor 73. The top of the rotating shaft 74 is connected to the rubber top sealing plate 24, which can effectively utilize the electromagnetic effect to drive the rubber top sealing plate 24 to rotate, thereby driving the polishing cylinder 4 to rotate, making it convenient to drive the pipe to rotate and polish the inner hole.

[0035] The adjusting mechanism 3 includes a rotating frame 31 and a driving motor 34. A circular shaft 32 is connected to one side of the rotating frame 31. One end of the circular shaft 32 passes through the lower bracket 2 and is connected to a driven gear 33. A driving gear 1 35 is connected to the output end of the driving motor 34. One side of the driving gear 1 35 is engaged with the driven gear 33. A bearing 36 is connected to one side of the rotating frame 31. The polishing cylinder 4 is connected and set in the bearing 36. The bottom end of the driving motor 34 is connected to a motor bracket. The driving motor 34 drives the driving gear 1 35 to rotate, so that the driven gear 33 drives the rotating frame 31 to rotate, and the bearing 36 is used to drive the polishing cylinder 4 to rotate, which facilitates the loading and unloading of pipe fittings.

[0036] The top of the base 1 is connected with reinforcement ribs 26 , and the motor bracket is connected between the reinforcement ribs 26 , which can effectively ensure the supporting effect of the lower bracket 2 and the stability of the base 1 .

[0037] The polishing mechanism 19 includes a polishing tube rack 191, and multiple groups of polishing racks 192 are slidingly arranged on the inner wall of the polishing tube rack 191. Inductance coil racks 193 are connected between the inner walls of the polishing tube rack 191. The polishing rack 192 can be used for polishing, or the inductance coil rack 193 can be used to drive the polishing needle to rotate mechanically for polishing. It can effectively play two polishing methods and ensure applicability.

[0038] The polishing frame 192 includes an inner seat 1921, and a rectangular slide rod 1922 is connected to one side of the inner seat 1921. One end of the rectangular slide rod 1922 passes through the polishing pipe frame 191 and is connected to a polishing block 1923. It can slide outward according to the magnetic force generated by the electromagnetic suction cup 8 and is suitable for processing pipes of various diameters.

[0039] A slide groove is provided on one side of the upper bracket 13 corresponding to the screw rod 14, and guide rods 27 are slidably provided on both sides of the connecting frame 16. The two ends of the guide rods 27 are fixedly provided on both sides of the slide groove to ensure the stability of the connecting frame 16 moving up and down and to ensure the support effect on the polishing mechanism 19.

[0040] Working principle: When the invention is in use, the polished pipe is placed in the polishing cylinder 4, and each cylinder 1 5 extends to push the clamping plate 6 to clamp the pipe, and then the driving motor 34 is started to drive the driven gear 33 to rotate through the active gear 1 35, so that the rotating frame 31 drives the polishing cylinder 4 to rotate to a vertical state. In the vertical state, the sleeve 25 slides downward to connect with the rubber top sealing plate 24. At the same time, the rubber top sealing plate 24 seals the bottom end of the polishing cylinder 4. The reduction motor 15 is started and the connecting frame 16 is driven downward through the screw rod 14 until the polishing mechanism 19 is inserted into the pipe. Then, the electromagnetic suction cup 8 is energized to generate magnetic force. Each polishing rack 192 is attracted by the magnetic force and slides outward, so that the polishing block 1923 fits the inner wall of the pipe. Then, the stator coil 72 is energized to generate a magnetic field, so that the internal rotor 73 rotates, and the rotor 73 drives the rotating shaft 74 to rotate, and at the same time drives the rubber top sealing plate 24 to rotate. The rubber top sealing plate 24 drives the sleeve 25 to rotate and drives the polishing cylinder 4 to rotate, so that the internal pipe rotates, and the inner wall of the pipe rubs against the polishing block 1923 for polishing. The present invention has the advantages of simple structure, easy use and good use effect.

[0041] Example 2

[0042] See also Figure 1-7 The present invention provides a technical solution: it includes a base 1, the top of the base 1 is connected to a lower bracket 2, one side of the lower bracket 2 is connected to an adjusting mechanism 3, one side of the adjusting mechanism 3 is connected to a polishing cylinder 4, the outer surface of the polishing cylinder 4 is connected to a cylinder 5, the output end of the cylinder 5 extends through the polishing cylinder 4 and is connected to a splint 6, the top of the base 1 is connected to a driving mechanism 7, one side of the inner wall of the polishing cylinder 4 is connected to an electromagnetic suction cup 8, the top of the lower bracket 2 is connected to a turntable 9, the inner side of the turntable 9 is provided with a rack 10, one side of the lower bracket 2 is connected to a servo motor 11, and the output end of the servo motor 11 is connected to a driving gear 2 12. One side of the driving gear 2 12 is engaged with the rack 10. The top of the turntable 9 is connected to an upper bracket 13. One side of the upper bracket 13 is connected to a screw rod 14. The top of the screw rod 14 passes through the upper bracket 13 and is connected to a reduction motor 15. One end of the polishing cylinder 4 is connected to a connecting frame 16. The bottom end of the connecting frame 16 is connected to a screw rod 2 17. The bottom end of the screw rod 2 17 is rotatably provided with a rotating tube 18. The outer ring of the rotating tube 18 is rotatably provided with a polishing mechanism 19. The top of the polishing mechanism 19 is respectively connected to a cylinder 2 20 and a cylinder 3 22. One end of the cylinder 20 is connected to an internal thread block 21, and one end of the cylinder 3 22 is connected to a roller 23.

[0043] Working principle: When the invention is in use, the pipe is placed in 4 for fixing, and then the polishing liquid is injected into the polishing cylinder 4, the polishing mechanism 19 is inserted into the pipe, and the inductor coil frame 193 is energized to generate a magnetic field, and then the polishing needle is poured between the inside of the pipe and the polishing mechanism 19, and then the driving mechanism 7 is started to drive the polishing cylinder 4 to rotate, so that the internal polishing liquid and polishing needle are stirred, and the inner hole of the pipe is polished with the help of the magnetic field adsorption. After the polishing is completed, the polishing mechanism 19 is taken out of the pipe, and the servo motor 11 can be started to drive the turntable 9 to rotate through the active gear 2 12, thereby driving the polishing mechanism 19 to rotate and change position, so that it is convenient to directly observe the polishing effect from above the polishing cylinder 4 or take out the pipe.

[0044] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An inner hole electromagnetic polishing device, comprising a base (1), characterized in that: The top of the base (1) is connected to a lower bracket (2), one side of the lower bracket (2) is connected to an adjustment mechanism (3), one side of the adjustment mechanism (3) is connected to a polishing cylinder (4), the outer surface of the polishing cylinder (4) is connected to a cylinder 1 (5), the output end of the cylinder 1 (5) extends through the polishing cylinder (4) and is connected to a clamping plate (6), the top of the base (1) is connected to a driving mechanism (7), one side of the inner wall of the polishing cylinder (4) is connected to an electromagnetic suction cup (8), the top of the lower bracket (2) is connected to a middle turntable (9), the inner side of the middle turntable (9) is provided with a rack (10), the one side of the lower bracket (2) is connected to a servo motor (11), the output end of the servo motor (11) is connected to a driving gear 2 (12), the driving gear 2 (12) ) one side is meshed with the rack (10), the top of the middle turntable (9) is connected to an upper bracket (13), one side of the upper bracket (13) is connected to a screw rod (14), the top of the screw rod (14) passes through the upper bracket (13) and is connected to a reduction motor (15), one end of the polishing cylinder (4) is connected to a connecting frame (16), the bottom end of the connecting frame (16) is connected to a screw rod (17), the bottom end of the screw rod (17) is rotatably provided with a rotating tube (18), the outer ring of the rotating tube (18) is rotatably provided with a polishing mechanism (19), the top of the polishing mechanism (19) is respectively connected to a cylinder two (20) and a cylinder three (22), one end of the cylinder two (20) is connected to an internal thread block (21), and one end of the cylinder three (22) is connected to a roller (23); The polishing mechanism (19) comprises a polishing tube rack (191), wherein a plurality of polishing racks (192) are slidably provided on the inner wall of the polishing tube rack (191), and an inductive coil rack (193) is connected between the inner walls of the polishing tube rack (191). The inductive coil rack generates a magnetic field, and in conjunction with the rotation of the polishing cylinder, the inner wall of the tube is polished using polishing liquid and a polishing needle, thereby effectively ensuring the polishing effect and being able to perform polishing processing on the inner hole of a long tube; The polishing frame (192) comprises an inner seat (1921), one side of the inner seat (1921) is connected to a rectangular slide rod (1922), one end of the rectangular slide rod (1922) passes through the polishing tube frame (191) and is connected to a polishing block (1923).

2. The inner hole electromagnetic polishing device according to claim 1, characterized in that: A sleeve (25) is slidably provided at the bottom end of the polishing cylinder (4), a rubber top sealing plate (24) is slidably provided on one side of the inner wall of the sleeve (25), and the bottom end of the rubber top sealing plate (24) is connected to the driving mechanism (7).

3. The inner hole electromagnetic polishing device according to claim 2, characterized in that: The driving mechanism (7) comprises a fixed housing (71), a stator coil (72) is connected to one side of the inner wall of the fixed housing (71), a rotor (73) is rotatably arranged in the stator coil (72), a rotating shaft (74) is slidably arranged at the top end of the rotor (73), and the top end of the rotating shaft (74) is connected to the rubber top sealing plate (24).

4. The inner hole electromagnetic polishing device according to claim 3, characterized in that: The adjustment mechanism (3) includes a rotating frame (31) and a driving motor (34), one side of the rotating frame (31) is connected to a circular shaft (32), one end of the circular shaft (32) passes through the lower bracket (2) and is connected to a driven gear (33), the output end of the driving motor (34) is connected to a driving gear 1 (35), one side of the driving gear 1 (35) is meshed with the driven gear (33), one side of the rotating frame (31) is connected to a bearing (36), the polishing cylinder (4) is connected and set in the bearing (36), and the bottom end of the driving motor (34) is connected to a motor bracket.

5. The inner hole electromagnetic polishing device according to claim 4, characterized in that: The top end of the base (1) is connected with a reinforcement rib (26), and the motor bracket is connected and arranged between the reinforcement ribs (26).

6. The inner hole electromagnetic polishing device according to claim 5, characterized in that: A sliding groove is provided on one side of the upper bracket (13) corresponding to the screw rod 1 (14), and guide rods (27) are slidably provided on both sides of the connecting frame (16), and both ends of the guide rods (27) are fixedly provided on both sides of the sliding groove.

7. An inner hole electromagnetic polishing process, using the inner hole electromagnetic polishing device according to claim 6, characterized in that: The following steps are involved: Step 1: Place the pipe to be polished in the polishing cylinder (4), extend each cylinder 1 (5) to push the clamping plate (6) to clamp the pipe, and then start the driving motor (34) to drive the driven gear (33) to rotate through the driving gear 1 (35), so that the rotating frame (31) drives the polishing cylinder (4) to rotate to a vertical state. In the vertical state, the sleeve (25) slides downward to connect with the rubber top sealing plate (24), and at the same time, the rubber top sealing plate (24) seals the bottom end of the polishing cylinder (4); Step 2: The reduction motor (15) is started, and the connecting frame (16) is driven downward by the screw rod (14) until the polishing mechanism (19) is inserted into the pipe. Then, the electromagnetic chuck (8) is energized to generate magnetic force. Each polishing frame (192) is attracted by the magnetic force and slides outward, and the polishing block (1923) is fitted with the inner wall of the pipe. Then, the stator coil (72) is energized to generate a magnetic field, so that the internal rotor (73) rotates. The rotor (73) drives the rotating shaft (74) to rotate, and at the same time drives the rubber top sealing plate (24) to rotate. The rubber top sealing plate (24) drives the sleeve (25) to rotate, and drives the polishing cylinder (4) to rotate, so that the internal pipe rotates, and the inner wall of the pipe and the polishing block (1923) rub against each other for polishing. Alternatively, a polishing liquid is injected into the polishing cylinder (4), a polishing mechanism (19) is inserted into the pipe, an inductor coil frame (193) is energized to generate a magnetic field, and then the polishing needle is placed between the inside of the pipe and the polishing mechanism (19), and then the driving mechanism (7) is started to drive the polishing cylinder (4) to rotate, thereby stirring the polishing liquid and the polishing needle inside, and cooperating with the magnetic field adsorption to polish the inner hole of the pipe; Step 3: After polishing is completed, the polishing mechanism (19) is taken out of the pipe, and the servo motor (11) is started to drive the middle turntable (9) to rotate through the driving gear 2 (12), thereby driving the polishing mechanism (19) to rotate and change position, so as to facilitate direct observation of the polishing effect from above the polishing cylinder (4) or to remove the pipe.

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