Pipe inner wall treatment device

Abstract

The present invention discloses a pipe inner wall processing device, comprising a mounting pipe, a sleeve is rotatably mounted on the outer wall of the mounting pipe, three nozzles for electrolyte spraying are connected to the mounting pipe through an adjustment mechanism, a single liquid inlet mechanism for supplying liquid to each nozzle is connected inside the sleeve, the adjustment mechanism comprises two connecting rod frames, the two connecting rod frames are rotatably connected to the outer wall of the sleeve near one end of the rod sleeve through a pin shaft, and the mounting pipe is provided with a transmission mechanism for expanding or contracting the two connecting rod frames. The present invention facilitates the use of metal pipes with different diameters by changing the vertical distance of the nozzles, and at the same time, the adaptive adjustment of the horizontal distance changes the spacing between adjacent nozzles, and the spraying density can be adaptively adjusted, thereby greatly improving the work efficiency and polishing quality.

Description

Technical Field

[0001] The invention relates to the technical field of metal pipe inner wall surface polishing, in particular to a pipe inner wall processing device. Background Art

[0002] The smoothness of the inner wall of the pipe is very important. This is because the roughness of the inner wall of the pipe will not only reduce the transmission efficiency of the fluid, but also easily cause sediment to adhere to the inner wall of the pipe, hindering the flow of the fluid and accelerating the corrosion of the fluid to the pipe. The existing inner wall treatment device of the pipe fitting is not convenient to adjust the position of the nozzle when completing the electrochemical polishing when the diameters of the metal pipes are different, which affects the efficiency and quality of the electrochemical polishing. Summary of the invention

[0003] The purpose of the present invention is to provide a device for processing the inner wall of a pipe fitting, which is convenient for use with metal pipes of different diameters by changing the vertical distance of the nozzle. At the same time, the adaptive adjustment of the horizontal distance changes the spacing between adjacent nozzles, and the spraying density can be adaptively adjusted, thereby greatly improving the work efficiency and polishing quality, and solving the problems in the background technology.

[0004] A pipe inner wall treatment device comprises a mounting pipe, a sleeve is rotatably mounted on the outer wall of the mounting pipe, three nozzles for electrolyte spraying are connected to the mounting pipe through an adjustment mechanism, and a single liquid inlet mechanism for supplying liquid to each nozzle is connected inside the sleeve;

[0005] The adjustment mechanism includes two connecting rod frames, and the two connecting rod frames are rotatably connected to the outer wall of the sleeve near one end of the rod sleeve through a pin shaft. A plurality of mounting seats are respectively arranged at the end points of the top and bottom of the two connecting rod frames, and each of the nozzles is correspondingly mounted on a mounting seat. The mounting tube is provided with a transmission mechanism for expanding or contracting the two connecting rod frames, and both ends of the mounting tube are connected to a walking mechanism for moving the driving device, and the walking mechanism is connected to a driving mechanism for operating the transmission mechanism.

[0006] Preferably, the transmission mechanism includes a screw rod, which is rotatably mounted on the outer wall of the mounting tube, and the outer wall of the screw rod is connected to a rod sleeve by a thread, and one end of each of the connecting rod frames is hinged with a second hinged rod, and two ends of the second hinged rods away from the connecting rod frame are respectively meshed with incomplete gears, and the incomplete gears are rotatably mounted inside the mounting frame via a mounting shaft, and the other end of each of the connecting rod frames is hinged with two first hinged rods, and the ends of the two first hinged rods away from the connecting rod frame are respectively rotatably connected to the rod sleeve through a mounting assembly.

[0007] Preferably, the mounting assembly comprises a mounting sleeve, the mounting sleeve is fixedly connected to the outer wall of the rod sleeve, two second mounting blocks are fixedly mounted inside the mounting sleeve, and each of the second mounting blocks is rotationally connected to the two first hinged rods via a pin shaft.

[0008] Preferably, the walking mechanism includes two first mounting blocks, the two first mounting blocks are respectively fixedly connected to the two ends of the mounting tube, the upper surface and the lower surface of each first mounting block are respectively fixedly connected to the first electric telescopic rod, and the output end of each first electric telescopic rod is fixedly connected to the walking wheel.

[0009] Preferably, the driving mechanism includes a rotating sleeve and a motor, the rotating sleeve is fixedly connected to one end of the screw rod, a first gear is fixed to the outer wall of the rotating sleeve close to one end of the mounting sleeve, the motor is fixedly connected to the upper surface of one of the first mounting blocks through a fixing part, the output shaft of the motor is fixedly connected to a second gear meshing with the first gear, the side wall of the first mounting block where the second gear is located is connected to a control mechanism for limiting the rod sleeve, and a trigger mechanism for controlling the operation of the walking mechanism is connected to the back side of the rotating sleeve.

[0010] Preferably, the control mechanism includes two mounting strips, the two mounting strips are respectively fixedly connected to the side wall of the first mounting block where the second gear is located, a third mounting block is installed inside the two mounting strips, the two third mounting blocks are respectively penetrated by through holes and installed with second electric telescopic rods, the opposite surfaces of the two second electric telescopic rods are fixed with card blocks, and the outer wall of the rod sleeve is provided with a card groove matching the card block.

[0011] Preferably, the trigger mechanism includes a limit groove, a lever and a contact switch, the limit groove is opened on the back side of the rotating sleeve, the lever is installed on the side wall of the first mounting block where the second gear is located by fixed rotation, and the contact switch is fixedly connected to the side wall of the first mounting block where the lever is located.

[0012] Preferably, the connecting rod frame is also connected to a pre-grinding mechanism for the inner wall of the metal pipe, and the pre-grinding mechanism includes two grinding wheels, and the two grinding wheels are rotatably mounted on a mounting seat close to the mounting frame through a fixing plate.

[0013] Preferably, the single liquid inlet mechanism includes a plurality of sealing gaskets, and the plurality of sealing gaskets are arranged between the mounting tube and the sleeve, and three liquid storage chambers are formed between the plurality of sealing gaskets, the mounting tube and the sleeve, and the inner wall of each liquid storage chamber is connected to a liquid inlet pipe for liquid inlet, and the three nozzles are connected to the corresponding three liquid storage chambers through a conduit.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention can adjust the connecting rod frame to expand or contract through the transmission mechanism arranged on the adjustment mechanism. When the connecting rod frame is in a contracted state, the vertical distance between the nozzles becomes larger and the horizontal distance becomes smaller. When the connecting rod frame is in an expanded state, the vertical distance between the nozzles becomes smaller and the horizontal distance becomes larger. The change in the vertical distance of the nozzles facilitates the use of metal pipes with different diameters. At the same time, the adaptive adjustment of the horizontal distance changes the spacing between adjacent nozzles, and the spraying density can be adaptively adjusted, thereby greatly improving the work efficiency and polishing quality.

[0016] 2. The present invention sets a control mechanism, which controls the second electric telescopic rod to work after the adjustment is completed, so that the second electric telescopic rod drives the card block to disengage from the card slot. At this time, the rod sleeve releases the limiting effect. When the motor drives the rotating sleeve to rotate, it further drives the rod sleeve to rotate. Due to the connection effect of the first hinged rod, the connecting rod frame and the nozzle and grinding wheel thereon can be further driven to rotate. At this time, the sleeve rotates synchronously with the connecting rod frame. Through the circumferential rotation of the grinding wheel, the inner wall of the metal pipe can be pretreated to prevent impurities from affecting the electrochemical polishing process. Through the circumferential high-speed rotation of the nozzle, the inner wall of the metal pipe can be circumferentially polished, thereby further improving the work efficiency.

[0017] 3. The present invention arranges the limit groove and the limit block. When the rotating sleeve completes one rotation, the limit block fixed on the lever is located in the arc groove inside the limit groove. At this time, the cooperation of the arc groove and the limit block can realize the swing of the limit block. Through the swing of the limit block, the contact switch and the lever can be contacted once. When the lever is pressed once, the walking wheel works briefly, thereby driving the entire polishing to step forward once. In this cycle, the electrochemical polishing process can be performed on the entire pipeline, thereby greatly improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention;

[0019] Figure 2 It is a side view stereoscopic structural schematic diagram of the present invention;

[0020] Figure 3 It is a front view structural schematic diagram of the present invention;

[0021] Figure 4 It is a CC cross-sectional structural schematic diagram of the present invention;

[0022] Figure 5 It is a schematic diagram of the DD cross-sectional structure of the present invention.

[0023] In the figure: 1. walking wheel; 2. first electric telescopic rod; 3. mounting tube; 4. first mounting block; 5. mounting frame; 6. incomplete gear; 7. connecting rod frame; 8. first hinged rod; 9. second mounting block; 10. rod sleeve; 11. first gear; 12. rotating sleeve; 13. fixing piece; 14. motor; 15. second gear; 16. third mounting block; 17. mounting sleeve; 18. screw rod; 19. sleeve; 20. mounting seat; 21. nozzle; 22. grinding wheel; 23. second hinged rod; 24. mounting shaft; 25. second electric telescopic rod; 26. slot; 27. limit slot; 28. lever; 29. ​​contact switch; 30. mounting strip; 31. liquid inlet pipe; 32. sealing pad; 33. liquid storage chamber. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0025] See also Figures 1 to 5 The present invention provides a technical solution: a pipe inner wall treatment device, comprising a mounting pipe 3, a sleeve 19 is rotatably mounted on the outer wall of the mounting pipe 3, three nozzles 21 for electrolyte spraying are connected to the mounting pipe 3 through an adjustment mechanism, and a single liquid inlet mechanism for supplying liquid to each nozzle 21 is connected inside the sleeve 19;

[0026] The adjusting mechanism includes two connecting rod frames 7, which are rotatably connected to the outer wall of the sleeve 19 near one end of the rod sleeve 10 through a pin shaft. A plurality of mounting seats 20 are respectively arranged at the end points of the top and bottom of the two connecting rod frames 7. Each nozzle 21 is correspondingly mounted on the mounting seat 20. The mounting tube 3 is provided with a transmission mechanism for expanding or contracting the two connecting rod frames 7. Both ends of the mounting tube 3 are connected with a walking mechanism for moving the driving device, and the walking mechanism is connected with a driving mechanism for operating the transmission mechanism.

[0027] The connecting rod frame 7 can be adjusted to expand or contract by the transmission mechanism arranged on the adjustment mechanism. When the connecting rod frame 7 is in a contracted state, the vertical distance between the nozzles 21 becomes larger and the horizontal distance becomes smaller. When the connecting rod frame 7 is in an expanded state, the vertical distance between the nozzles 21 becomes smaller and the horizontal distance becomes larger. The change in the vertical distance of the nozzles 21 facilitates the use of metal pipes with different diameters. At the same time, the adaptive adjustment of the horizontal distance changes the spacing between adjacent nozzles 21, and the spraying density can be adaptively adjusted, thereby greatly improving the work efficiency and polishing quality.

[0028] Furthermore, the transmission mechanism includes a screw 18, which is rotatably mounted on the outer wall of the mounting tube 3. The outer wall of the screw 18 is connected to a rod sleeve 10 through a thread. One end of each connecting rod frame 7 is hinged with a second hinged rod 23, and the ends of the two second hinged rods 23 away from the connecting rod frame 7 are respectively meshed with incomplete gears 6. The incomplete gears 6 are rotatably mounted inside the mounting frame 5 through a mounting shaft 24. The other end of each connecting rod frame 7 is hinged with two first hinged rods 8, and the ends of the two first hinged rods 8 away from the connecting rod frame 7 are respectively rotatably connected to the rod sleeve 10 through the mounting assembly.

[0029] Since the supporting point of the connecting rod frame 7 close to the first hinged rod 8 is rotatably connected to the sleeve 19, when the rod sleeve 10 drives the first hinged rod 8 to move, the first hinged rod 8 will drive the connecting rod frame 7 to contract or expand.

[0030] Furthermore, the mounting assembly includes a mounting sleeve 17, which is fixedly connected to the outer wall of the rod sleeve 10, and two second mounting blocks 9 are fixedly installed inside the mounting sleeve 17, and each second mounting block 9 is rotationally connected to the two first hinged rods 8 via a pin shaft.

[0031] By setting the installation assembly, on the one hand, when the rod sleeve 10 drives the first hinged rod 8 to move, the connecting rod frame 7 contracts or expands. On the other hand, when the rod sleeve 10 drives the first hinged rod 8 to rotate, it can drive the connecting rod frame 7 to rotate as a whole.

[0032] Furthermore, the walking mechanism includes two first mounting blocks 4, which are respectively fixedly connected to the two ends of the mounting tube 3, and the upper surface and lower surface of each first mounting block 4 are respectively fixedly connected to the first electric telescopic rod 2, and the output end of each first electric telescopic rod 2 is fixedly connected to the walking wheel 1.

[0033] The height adjustment function of the first electric telescopic rod 2 facilitates the adaptation to pipes of different diameters, and the travel wheels 1 facilitate the movement of the device inside the pipe.

[0034] Furthermore, the driving mechanism includes a rotating sleeve 12 and a motor 14. The rotating sleeve 12 is fixedly connected to one end of the screw 18. A first gear 11 is fixed to the outer wall of the rotating sleeve 12 near one end of the mounting sleeve 17. The motor 14 is fixedly connected to the upper surface of one of the first mounting blocks 4 through a fixing member 13. The output shaft of the motor 14 is fixedly connected to a second gear 15 meshing with the first gear 11. The side wall of the first mounting block 4 where the second gear 15 is located is connected to a control mechanism for limiting the rod sleeve 10. The back of the rotating sleeve 12 is connected to a trigger mechanism for controlling the operation of the walking mechanism.

[0035] When the driving motor 14 is working, it can further drive the second gear 15 to rotate. Due to the meshing action of the second gear 15 and the first gear 11, the rotating sleeve 12 can be further rotated. The rotation of the rotating sleeve 12 can further drive the screw 18 to rotate.

[0036] Furthermore, the control mechanism includes two mounting bars 30, which are respectively fixedly connected to the side walls of the first mounting block 4 where the second gear 15 is located, and the third mounting blocks 16 are installed inside the two mounting bars 30. The two third mounting blocks 16 are respectively penetrated by through holes and installed with second electric telescopic rods 25, and the opposite surfaces of the two second electric telescopic rods 25 are fixed with card blocks, and the outer wall of the rod sleeve 10 is provided with a card slot 26 matching the card block.

[0037] When the rotating sleeve 12 rotates, the screw rod 18 can be further driven to rotate. Since the screw rod 18 is threadedly connected to the rod sleeve 10, the rod sleeve 10 is in a limited state, which can further drive the rod sleeve 10 to move left and right on the mounting tube 3. When the second electric telescopic rod 25 is controlled to work, the second electric telescopic rod 25 drives the block to disengage from the slot 26. At this time, the rod sleeve 10 releases the limiting effect. When the motor 14 works to drive the rotating sleeve 12 to rotate, the rod sleeve 10 is further driven to rotate. Due to the connection of the first hinged rod 8, the connecting rod frame 7 and the nozzle 21 and the grinding wheel 22 thereon can be further driven to rotate. At this time, the sleeve 19 rotates synchronously with the connecting rod frame 7. Through the circumferential high-speed rotation of the nozzle 21, the inner wall of the metal pipe can be polished circumferentially, which greatly improves the work efficiency.

[0038] Furthermore, the trigger mechanism includes a limit groove 27, a lever 28 and a contact switch 29. The limit groove 27 is opened on the back side of the rotating sleeve 12. The lever 28 is installed on the side wall of the first mounting block 4 where the second gear 15 is located by fixed rotation. The contact switch 29 is fixedly connected to the side wall of the first mounting block 4 where the lever 28 is located.

[0039] After the rotating sleeve 12 completes one rotation, due to the setting of the limit groove 27 and the limit block, when the rotating sleeve 12 rotates, the limit block fixed on the lever 28 is located in the arc groove inside the limit groove 27. At this time, the cooperation between the arc groove and the limit block can realize the swing of the limit block. Through the swing of the limit block, the contact switch 29 and the lever 28 can be contacted once. When the lever 28 is pressed once, the walking wheel 1 works briefly, thereby driving the entire polishing to step forward once. In this cycle, the entire pipeline can be electrochemically polished, thereby greatly improving the work efficiency.

[0040] Furthermore, the connecting rod frame 7 is also connected to a pre-grinding mechanism for the inner wall of the metal pipe, and the pre-grinding mechanism includes two grinding wheels 22. The two grinding wheels 22 are rotatably mounted on a mounting seat 20 close to the mounting frame 5 through a fixing plate.

[0041] The inner wall of the metal pipe can be pretreated by the circumferential rotation of the grinding wheel 22 to prevent impurities from affecting the electrochemical polishing process.

[0042] Furthermore, the single liquid inlet mechanism includes a plurality of sealing gaskets 32, and the plurality of sealing gaskets 32 are arranged between the mounting tube 3 and the sleeve 19. Three liquid storage chambers 33 are formed between the plurality of sealing gaskets 32, the mounting tube 3 and the sleeve 19. The inner wall of each liquid storage chamber 33 is connected to a liquid inlet pipe 31 for liquid inlet, and the three nozzles 21 are connected to the corresponding three liquid storage chambers 33 through a conduit.

[0043] Three liquid storage chambers 33 are formed between a plurality of sealing gaskets 32, the mounting tube 3 and the sleeve 19. On the one hand, due to the connection between the nozzle 21 and the liquid storage chamber 33, the nozzle 21 can be rotated circumferentially at a high speed. On the other hand, the electrochemical polishing efficiency can be improved by the superposition of a plurality of nozzles 21. At the same time, since the sealing gasket 32 ​​isolates the single liquid storage chamber 33, cleaning liquid can be added to one of the liquid storage chambers 33, and the tube wall after electrochemical polishing can be flushed, thereby further improving the working efficiency.

[0044] Working principle: When the pipe inner wall treatment device is used, the first wire is first connected to the outer wall of the sleeve 19 through the brush, and the second wire is connected to the metal pipe to be polished. When the electrolyte is sprayed through the nozzle 21, the nozzle 21 acts as a cathode and the metal pipe acts as an anode. The electrolyte is sprayed between the two electrodes. When current passes, the inner wall surface of the metal pipe will be dissolved, thereby realizing the electrochemical polishing process;

[0045] By setting the adjustment mechanism, at the beginning, due to the plugging of the card block and the card slot 26, the rod sleeve 10 is in a limited position state. When the driving motor 14 works, the second gear 15 can be further driven to rotate. Due to the meshing action of the second gear 15 and the first gear 11, the rotation sleeve 12 can be further realized to rotate. The rotation of the rotating sleeve 12 can further drive the screw rod 18 to rotate. Since the screw rod 18 is threadedly connected to the rod sleeve 10, the rod sleeve 10 is in a limited position state, which can further drive the rod sleeve 10 to move left and right on the mounting tube 3. Since the connecting rod frame 7 is close to the first hinge, the connecting rod frame 7 can be driven to rotate left and right on the mounting tube 3. The fulcrum of the rod 8 is rotatably connected to the sleeve 19. When the rod sleeve 10 drives the first hinged rod 8 to move toward the end close to the sleeve 19, the first hinged rod 8 will drive the connecting rod frame 7 to be in a contracted state. At this time, the vertical distance between the nozzles 21 becomes larger and the horizontal distance becomes smaller, which is convenient for the use of wider metal pipes. Similarly, when the rod sleeve 10 drives the first hinged rod 8 to move toward the end away from the sleeve 19, it will drive the connecting rod frame 7 to be in an expanded state. At this time, the vertical distance between the nozzles 21 becomes smaller and the horizontal distance becomes larger, which is convenient for the use of narrower metal pipes.

[0046] When the adjustment is completed, the second electric telescopic rod 25 is controlled to work, so that the second electric telescopic rod 25 drives the block to disengage from the slot 26. At this time, the rod sleeve 10 releases the limiting effect. When the motor 14 works to drive the rotating sleeve 12 to rotate, the rod sleeve 10 is further driven to rotate. Due to the connection effect of the first hinged rod 8, the connecting rod frame 7 and the nozzle 21 and the grinding wheel 22 thereon can be further driven to rotate. At this time, the sleeve 19 rotates synchronously with the connecting rod frame 7. Through the circumferential rotation of the grinding wheel 22, the inner wall of the metal pipe can be pretreated to prevent impurities from affecting the electrochemical polishing process. Through the circumferential high-speed rotation of the nozzle 21, the inner wall of the metal pipe can be circumferentially polished.

[0047] After the rotating sleeve 12 completes one rotation, due to the setting of the limit groove 27 and the limit block, when the rotating sleeve 12 rotates, the limit block fixed on the lever 28 is located in the arc groove inside the limit groove 27. At this time, the cooperation between the arc groove and the limit block can realize the swing of the limit block. Through the swing of the limit block, the contact switch 29 and the lever 28 can be contacted once. When the lever 28 is pressed once, the walking wheel 1 works briefly, thereby driving the entire polishing to step forward once. Such a cycle can be repeated to perform the electrochemical polishing process on the entire pipeline.

[0048] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe inner wall treatment device, comprising a mounting pipe (3), characterized in that: A sleeve (19) is rotatably mounted on the outer wall of the mounting tube (3); three nozzles (21) for electrolyte spraying are connected to the mounting tube (3) via an adjustment mechanism; a single liquid inlet mechanism for supplying liquid to each nozzle (21) is connected inside the sleeve (19); the adjustment mechanism comprises two connecting rod frames (7); the two connecting rod frames (7) are rotatably connected to the outer wall of the sleeve (19) near one end of the rod sleeve (10) via a pin; a plurality of mounting seats (20) are respectively arranged at the top and bottom end points of the two connecting rod frames (7); each nozzle (21) is correspondingly mounted on a mounting seat (20); the mounting tube (3) is provided with a transmission mechanism for expanding or contracting the two connecting rod frames (7); the mounting tube (3) is provided with a transmission mechanism for expanding or contracting the two connecting rod frames (7); The two ends of the connecting rod frame (3) are connected to a walking mechanism for driving the device to move, and the walking mechanism is connected to a driving mechanism for the transmission mechanism to operate; the transmission mechanism comprises a screw rod (18), the screw rod (18) is rotatably mounted on the outer wall of the mounting tube (3), the outer wall of the screw rod (18) is connected to a rod sleeve (10) by a thread, one end of each of the connecting rod frames (7) is respectively hinged to a second hinged rod (23), the ends of the two second hinged rods (23) away from the connecting rod frame (7) are respectively meshed with an incomplete gear (6), the incomplete gear (6) is rotatably mounted inside the mounting frame (5) via a mounting shaft (24), the other end of each of the connecting rod frames (7) is hinged to two first hinged rods (8), the two first hinged rods (23) are respectively meshed with an incomplete gear (6), and the incomplete gear (6) is rotatably mounted inside the mounting frame (5) via a mounting shaft (24), and the other end of each of the connecting rod frames (7) is hinged to two first hinged rods (8), and the two first hinged rods (23) are respectively meshed with an incomplete gear (6). One end of the hinged rod (8) away from the connecting rod frame (7) is rotatably connected to the rod sleeve (10) through a mounting assembly; the mounting assembly comprises a mounting sleeve (17), the mounting sleeve (17) is fixedly connected to the outer wall of the rod sleeve (10), two second mounting blocks (9) are fixedly installed inside the mounting sleeve (17), each of the second mounting blocks (9) is rotatably connected to the two first hinged rods (8) through a pin shaft; the walking mechanism comprises two first mounting blocks (4), the two first mounting blocks (4) are respectively fixedly connected to the two ends of the mounting tube (3), the upper surface and the lower surface of each first mounting block (4) are respectively fixedly connected to the first electric telescopic rod (2), and the output of each first electric telescopic rod (2) is The ends of the two mounting blocks (4) are fixedly connected to a walking wheel (1); the driving mechanism comprises a rotating sleeve (12) and a motor (14); the rotating sleeve (12) is fixedly connected to one end of a screw rod (18); a first gear (11) is fixedly connected to an outer wall of the rotating sleeve (12) near one end of the mounting sleeve (17); the motor (14) is fixedly connected to an upper surface of one of the first mounting blocks (4) via a fixing member (13); an output shaft of the motor (14) is fixedly connected to a second gear (15) meshing with the first gear (11); a side wall of the first mounting block (4) where the second gear (15) is located is connected to a control mechanism for limiting the position of the rod sleeve (10); and a trigger mechanism for controlling the operation of the walking mechanism is connected to the back of the rotating sleeve (12);The control mechanism comprises two mounting bars (30), the two mounting bars (30) are respectively fixedly connected to the side wall of the first mounting block (4) where the second gear (15) is located, the two mounting bars (30) are each internally mounted with a third mounting block (16), the two third mounting blocks (16) are respectively penetrated by through holes and mounted with second electric telescopic rods (25), the opposite surfaces of the two second electric telescopic rods (25) are each fixed with a clamping block, and the outer wall of the rod sleeve (10) is provided with a clamping groove (26) matching the clamping block; the connecting rod frame (7) is also connected to a pre-grinding mechanism for the inner wall of the metal pipe, the pre-grinding mechanism comprises two grinding wheels (22), the two grinding wheels (22) are respectively rotatably mounted on a mounting seat (20) close to the mounting frame (5) through a fixing plate. ; 2. The pipe inner wall treatment device according to claim 1, characterized in that: The single liquid inlet mechanism comprises a plurality of sealing pads (32), the plurality of sealing pads (32) being arranged between the mounting tube (3) and the sleeve (19), and three liquid storage chambers (33) being formed between the plurality of sealing pads (32), the mounting tube (3) and the sleeve (19), the inner wall of each liquid storage chamber (33) being connected to a liquid inlet pipe (31) for liquid inlet, and the three nozzles (21) being connected to the corresponding three liquid storage chambers (33) via a conduit.

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