Pipeline joint polishing device

Abstract

The invention discloses a pipeline joint polishing device, and relates to the technical field of pipeline processing equipment, the pipeline joint polishing device comprises a plurality of conveying units arranged in parallel, a plurality of transferring units capable of carrying pipelines, and a polishing unit arranged parallel to the conveying units, and the plurality of transferring units are respectively inserted among the plurality of conveying units; the pipeline can move in the distribution direction of the conveying unit and the transferring unit till the two ends of the pipeline are in butt joint with the grinding units. And a bearing unit is arranged on one side of each transferring unit, and when the multiple transferring units transfer the pipelines in the direction perpendicular to the distribution direction of the transferring units, the bearing units can receive the transferred pipelines. According to the invention, the time required for blanking and material supplementing at the polishing station is shortened. And in addition, the machined pipeline does not need to be transferred after the conveying equipment is in place, and when the pipeline which is large in size and difficult in the conveying process is ground, the efficiency of pipeline grinding work can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline processing equipment, and in particular to a pipeline joint grinding device. Background Art

[0002] Pipe joint grinding is a common pipeline installation and maintenance technology. In the pipeline production process, it is mainly used to improve the sealing performance and connection strength of pipe joints. During the grinding process, first ensure that the surface of the pipe joint is clean, oil-free and rust-free. You can use sandpaper or a steel brush for cleaning. If the pipe joint is rusted, you need to remove the rust first. Then choose a suitable grinding wheel according to the material and shape of the pipe joint. Generally speaking, a grinding wheel can be selected for metal pipe joints, while sandpaper is required for plastic pipe joints. During the grinding process, fix the grinding wheel or sandpaper on the grinder, and then grind along the axis direction of the pipe joint. When grinding, keep the contact force between the grinding wheel or sandpaper and the surface of the pipe joint moderate to avoid being too tight or too loose. At the same time, keep the grinding speed stable to avoid being too fast or too slow. After the grinding is completed, it is necessary to check whether the surface of the pipe joint is smooth and whether there are any uneven places. If there are, you need to continue grinding until the surface is smooth.

[0003] For existing pipe joint grinding devices, for metal pipes with large volume and a certain length, in order to save time, two sets of equipment are usually used to perform grinding operations on the pipe joints at the same time. In order to save human resources, the large volume mostly needs to be moved to the grinding station by conveyor rollers. After the grinding operation is completed, the conveyor rollers are operated again to move the pipe out of the grinding station. In this process, due to the large volume of the pipe, the moving process takes a long time. The subsequent pipes to be polished also need to wait for the pipe to be completely moved out of the grinding station before they can fill the position and perform the grinding operation again, which affects the efficiency of the pipe grinding work. Therefore, the present application provides a pipe joint grinding device to meet the needs. Summary of the invention

[0004] In view of the above problems, the present application provides a pipe joint grinding device.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a pipe joint grinding device, comprising a plurality of transmission units arranged in parallel, a plurality of transfer units capable of carrying pipes, and a grinding unit arranged in parallel with the transmission units, wherein the plurality of transfer units are respectively interspersed between the plurality of transmission units, and the pipe can be moved along the distribution direction of the transmission units and the transfer units until both ends thereof are connected with the grinding units.

[0006] A receiving unit is provided on one side of each of the transfer units. When a plurality of transfer units transfer the pipelines along a direction perpendicular to their distribution direction, the receiving unit can receive the transferred pipelines.

[0007] Furthermore, the conveying units each include a first electric conveying roller and a second electric conveying roller, the first electric conveying roller and the second electric conveying roller are respectively opposite to the transfer unit and the receiving unit, and the first electric conveying roller and the second electric conveying roller are both arranged on the same supporting frame.

[0008] Furthermore, the transfer units all include a support bracket 1 distributed in a V-shaped structure, the bending position of the support bracket 1 is connected to a lifting frame 1 through a rotating shaft, a first base is provided below the lifting frame 1, and a first cylinder that can control the movement of the lifting frame 1 is provided on the first base.

[0009] The lifting frame 1 is provided with a motor that can control the rotating shaft and the supporting bracket 1 to rotate synchronously. As the supporting bracket 1 rotates, the orientation position of its open end changes, and the pipeline can slide along the inclined surface of the supporting bracket 1.

[0010] Furthermore, a driving gear is provided on the rotating shaft, and a linkage gear is provided on the outside of the lifting frame 1 and is located directly below the driving gear and meshed with the driving gear. A linkage shaft extending to the inside of the lifting frame 1 is provided at the central axis position of the linkage gear, and an arc-shaped support arm is provided on the linkage shaft. When the supporting bracket 1 rotates, the arc-shaped support arm rotates in the opposite direction to the supporting bracket 1 until it abuts against the bottom of the frame of the supporting bracket 1.

[0011] Furthermore, a pair of guide rollers arranged along the inclined direction are embedded on the two symmetrically distributed frames of the support bracket, and the ends of the guide rollers extend to the outside of the support bracket. The outside of the support bracket is provided with a motor that can control the rotation of one of the pair of guide rollers. The ends of the pair of guide rollers are provided with synchronous wheels, and two adjacent synchronous wheels are connected by a synchronous belt. When the pipeline slides along the inclined direction of the frame of the support bracket distributed downward, the pair of guide rollers on the frame rotate synchronously.

[0012] Furthermore, the receiving unit includes a supporting bracket 2 distributed in a V-shaped structure, the bending positions of the supporting bracket 2 are connected to a lifting frame 2 via a rotating shaft, a second base is provided below the lifting frame 2, and a second cylinder for controlling the movement of the lifting frame 2 is provided on the second base.

[0013] The lifting frame 2 is provided with a motor that can control the rotating shaft and the synchronous rotation of the supporting bracket 2. The end of the frame of the supporting bracket 2 close to the supporting bracket 1 is provided with an extension boss. As the supporting bracket 2 rotates, the orientation position of its open end corresponds to the orientation position of the open end of the supporting bracket 1, and the extension boss moves to the front and rear of the supporting bracket 1.

[0014] Furthermore, rotatable electric half cam one and electric half cam two are respectively embedded on the two symmetrically distributed frames of the support bracket one and the frame of the support bracket two close to the support bracket one. As the electric half cam one and the electric half cam two rotate, the convex surface and the concave surface thereof switch positions.

[0015] Furthermore, the grinding unit includes an outer grinding wheel and an inner grinding wheel which can respectively perform grinding operations on the inner and outer walls of the pipe, and the outer grinding wheel and the inner grinding wheel are arranged on the same docking frame, and the docking frame is connected to an electric rocker arm through a hydraulic push rod, and the electric rocker arm is provided with a follower gear frame, and the follower gear frame is arranged on a frame, and the frame is provided with a driving gear plate meshing with the follower gear frame and a motor which can control the rotation of the driving gear plate.

[0016] In summary, the technical effects and advantages of the present invention are as follows:

[0017] 1. The present invention reduces the time required for material unloading and material replenishment at the grinding station by means of the movable docking of the transfer unit and the receiving unit. It also allows the pipes after processing to be transported without waiting for the transportation equipment to arrive. When grinding the pipes with large volume and difficult transportation process, the efficiency of the pipe grinding work can be improved.

[0018] 2. The transfer unit in the present invention can position the pipeline during the grinding process, maintain the stability of the pipeline, and improve the grinding accuracy. When transferring the pipeline, the pressure damage caused by the movement of the pipeline to the support bracket 1 and the rotating shaft at its center position can be effectively reduced, and the shaking phenomenon of the support bracket 1 during the movement of the pipeline can be avoided, and the stability of the support bracket 1 when guiding the large-volume pipeline to slide down is improved, and the accuracy of the docking of the support bracket 2 with the support bracket 1 is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention when it is equipped with a pipeline.

[0021] Figure 2 It is a schematic diagram of the structure of the present invention when no pipeline is installed.

[0022] Figure 3 This is a schematic diagram of the structure after the pipeline of the present invention is transferred to the receiving unit.

[0023] Figure 4 It is a schematic diagram of the docking state of multiple transfer units and multiple receiving units of the present invention.

[0024] Figure 5 It is a schematic diagram of the structures of the transmission unit, the transfer unit and the receiving unit of the present invention.

[0025] Figure 6 It is a schematic diagram of the docking state of a single transfer unit and a single receiving unit of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the transfer unit of the present invention.

[0027] Figure 8 This is a schematic structural diagram of the transfer unit of the present invention from a second viewing angle.

[0028] Fig. 9 It is a structural schematic diagram of the receiving unit of the present invention.

[0029] Fig.10 It is a schematic diagram of the structure of the grinding unit of the present invention.

[0030] In the figure: 1. transmission unit; 11. first electric transmission roller; 12. second electric transmission roller; 13. support stand; 2. transfer unit; 21. support bracket 1; 22. lifting frame 1; 23. driving gear; 24. linkage gear; 25. linkage shaft; 26. arc support arm; 27. first base; 28. first cylinder; 211. guide roller; 212. synchronous wheel; 213. synchronous belt; 214. electric semi-cam 1; 3. receiving unit; 31. support bracket 2; 32. extension boss; 33. electric semi-cam 2; 34. lifting frame 2; 35. second base; 36. second cylinder; 4. grinding unit; 41. outer grinding wheel; 42. inner grinding wheel; 43. docking frame; 44. electric rocker arm; 45. follower gear frame; 46. driving gear plate. DETAILED DESCRIPTION

[0031] 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.

[0032] Example 1: Reference Figure 1-4A pipe joint grinding device shown includes a plurality of transmission units 1 arranged in parallel, a plurality of transfer units 2 that can carry pipes, and a grinding unit 4 arranged in parallel with the transmission units 1. The plurality of transfer units 2 are respectively inserted between the plurality of transmission units 1, and the pipe can move along the distribution direction of the transmission units 1 and the transfer units 2 until both ends thereof are connected with the grinding unit 4.

[0033] A receiving unit 3 is provided on one side of each transfer unit 2. When a plurality of transfer units 2 transfer the pipelines along a direction perpendicular to their distribution direction, the receiving unit 3 can receive the transferred pipelines.

[0034] Specifically, Figure 5 As shown, the conveying unit 1 includes a first electric conveying roller 11 and a second electric conveying roller 12, the first electric conveying roller 11 and the second electric conveying roller 12 are respectively opposite to the transfer unit 2 and the receiving unit 3, and the first electric conveying roller 11 and the second electric conveying roller 12 are both arranged on the same support frame 13. Before the pipeline is subjected to the grinding operation, the first electric conveying roller 11 can guide the pipeline to move linearly along its distribution direction until both ends of the pipeline are connected to the grinding unit 4.

[0035] like Figure 1 , 10 As shown, the grinding unit 4 includes an outer grinding wheel 41 and an inner grinding wheel 42 which can perform grinding operations on the inner and outer walls of the pipeline respectively. The outer grinding wheel 41 and the inner grinding wheel 42 are arranged on the same docking frame 43. The docking frame 43 is connected to an electric rocker arm 44 through a hydraulic push rod. Before the grinding operation is performed, the electric rocker arm 44 can control the docking frame 43, the outer grinding wheel 41 and the inner grinding wheel 42 to deviate to the top of the pipeline. When the pipeline is docked with the grinding unit 4, the electric rocker arm 44 can control the docking frame 43 to rotate to a position facing the pipeline. Subsequently, the hydraulic push rod is output to control the inner grinding wheel 42 and the outer grinding wheel 41 to move to the inner and outer sides of the pipeline respectively to perform the grinding operation.

[0036] In order to enable the inner grinding wheel 42 and the outer grinding wheel 41 to move along the loop line of the pipeline interface and perform a comprehensive grinding operation on the pipeline interface, a follower gear frame 45 is provided on the electric rocker 44, and the follower gear frame 45 is provided on the frame, and a driving gear plate 46 meshing with the follower gear frame 45 and a motor that can control the rotation of the driving gear plate 46 are provided on the frame. When the motor drives the driving gear plate 46 to rotate, the follower gear frame 45 meshing therewith can rotate synchronously, so as to achieve the purpose of driving the inner grinding wheel 42 and the outer grinding wheel 41 to move along the loop line of the pipeline interface to different positions of the interface, and a comprehensive grinding operation can be performed on the pipeline interface.

[0037] like Figure 6-8As shown, before the pipe grinding operation, in order to maintain the stability of the pipe, the transfer unit 2 needs to be docked with the pipe. The transfer unit 2 includes a support bracket 21 distributed in a V-shaped structure. The bending position of the support bracket 21 is connected to a lifting frame 22 through a rotating shaft. A first base 27 is provided below the lifting frame 22. The first base 27 is provided with a first cylinder 28 that can control the movement of the lifting frame 22. When the first cylinder 28 is output, the lifting frame 22 and the support bracket 21 rise synchronously, and the support bracket 21 smoothly carries the pipe. The transfer unit 2 can maintain the stability of the pipe so that it can stably accept the grinding operation.

[0038] After the grinding operation at the pipe interface is completed, since the lifting frame 22 is provided with a motor that can control the rotating shaft and the synchronous rotation of the support bracket 21, as the support bracket 21 rotates, the direction of the open end changes, and the pipe carried on the inner side thereof can slide along the inclined surface of the support bracket 21.

[0039] like Fig. 9 As shown, the receiving unit 3 includes a supporting bracket 2 31 distributed in a V-shaped structure, and the bending position of the supporting bracket 2 31 is connected to a lifting frame 2 34 through a rotating shaft, and a second base 35 is provided below the lifting frame 2 34. The second base 35 is provided with a second cylinder 36 that can control the movement of the lifting frame 2 34. Before the pipeline is transferred to the inside of the receiving unit 3, the second cylinder 36 can drive the lifting frame 2 34 to move, so that the supporting bracket 2 31 moves to a specified height.

[0040] The lifting frame 2 34 is provided with a motor that can control the rotating shaft and the synchronous rotation of the supporting bracket 2 31. The supporting bracket 2 31 is provided with an extension boss 32 at the end of the frame body close to the supporting bracket 1 21. When the supporting bracket 2 31 moves to a specified height, as the supporting bracket 2 31 rotates, the orientation position of its open end corresponds to the orientation position of the open end of the supporting bracket 1 21. At this time, the pipe sliding along the inclined surface of the supporting bracket 1 21 can be moved into the supporting bracket 2 31 to complete the transfer operation of the pipe.

[0041] When the orientation position of the opening end of the second support bracket 31 corresponds to the orientation position of the opening end of the first support bracket 21, the extension boss 32 moves to the front and rear of the first support bracket 21. The smoothness of the pipeline passing through the gap position generated when the second support bracket 31 corresponds to the first support bracket 21 can be improved, effectively avoiding the shaking of the pipeline caused by the gap generated when the second support bracket 31 corresponds to the first support bracket 21, and ensuring the stability of the pipeline during the sliding process.

[0042] After the pipe is moved to the inside of the receiving unit 3, the motor drives the second support bracket 31 to reset to maintain the stability of the pipe. Further processing operations can be performed on the pipe located in the receiving unit 3. At this time, the subsequent pipe to be polished has been transferred to the top of the transfer unit 2 by the first electric conveying roller 11, and the transfer unit 2 can carry the pipe again, so that the polishing unit 4 can perform polishing operations on the subsequent pipe again. If no further processing operations are required on the pipe. The second cylinder 36 can drive the lifting frame 2 34 and the pipe carried inside it to descend and reset, so that the support bracket 2 31 descends to a specified height, and the pipe contacts the surface of the second electric conveying roller 12.

[0043] In the above process, the pipe can be moved horizontally away from the grinding station by the movable docking of the transfer unit 2 and the receiving unit 3. After leaving the grinding station, the pipe can be moved again in the same direction as the feeding direction of the pipe. Compared with the pipe moving on the original grinding station to unload and replenish materials, this method reduces the time required for unloading and replenishing materials at the grinding station. And it can make the pipe after processing not need to wait for the transportation equipment to arrive before the transfer operation is carried out, and the subsequent pipes to be polished can also be quickly in place, which improves the speed of pipe replacement. When performing grinding operations on pipes with large volume and difficult transportation process, the efficiency of pipe grinding work can be improved.

[0044] Embodiment 2: A driving gear 23 is provided on the rotating shaft, and a linkage gear 24 is provided outside the lifting frame 22 and is located directly below the driving gear 23 and meshed with the driving gear 23. A linkage shaft 25 extending to the inside of the lifting frame 22 is provided at the central axis position of the linkage gear 24, and an arc-shaped support arm 26 is provided on the linkage shaft 25. When the supporting bracket 21 rotates and the pipeline slides along the inclined surface of the supporting bracket 21, the driving gear 23 rotates synchronously. Under the meshing force of the driving gear 23 and the linkage gear 24, the linkage shaft 25 rotates in the opposite direction to the rotating shaft, and the arc-shaped support arm 26 rotates in the opposite direction to the supporting bracket 21 until it abuts against the bottom of the frame of the supporting bracket 21 to support the supporting bracket 21.

[0045] When the pipeline slides along the inclined surface of the support bracket 1 21, the pressure damage caused by the movement of the pipeline to the support bracket 1 21 and the rotating shaft at its center is effectively reduced, and the pressure resistance and structural strength of the support bracket 1 21 are improved. The shaking phenomenon of the support bracket 1 21 during the movement of the pipeline can be avoided, and the stability of the support bracket 1 21 when guiding the large-volume pipeline to slide down is improved, and the accuracy of the docking of the support bracket 2 31 and the support bracket 1 21 is further improved, so as to ensure the work efficiency during the transfer of the pipeline.

[0046] Embodiment 3: A pair of guide rollers 211 arranged along the inclined direction are embedded on the two symmetrically distributed frames of the support bracket 1 21. The ends of the guide rollers 211 extend to the outside of the support bracket 1 21. A motor capable of controlling the rotation of one of the pair of guide rollers 211 is disposed outside the support bracket 1 21. The ends of the pair of guide rollers 211 are provided with synchronous wheels 212. Two adjacent synchronous wheels 212 are connected by synchronous belts 213. When the pipeline is transferred from the transfer unit to the receiving unit, the pipeline slides along the inclined direction of the frame of the support bracket 1 21 distributed downward, and the motor drives one of the pair of guide rollers 211 to rotate, and the synchronous wheels 212 disposed on the guide rollers 211 rotate synchronously. Under the connection of the synchronous belt 213, the pair of guide rollers 211 on the frame rotate synchronously. The speed of the pipeline movement can be increased, and the efficiency of the pipeline transfer operation is further improved.

[0047] Embodiment 4: The two symmetrically distributed frames of the support bracket 1 21 and the frame of the support bracket 2 31 close to the support bracket 1 21 are respectively embedded with a rotatable electric half cam 1 214 and an electric half cam 2 33. As the electric half cam 1 214 and the electric half cam 2 33 rotate, their convex surfaces and concave surfaces switch positions.

[0048] When the pipe is placed on the transfer unit 2 for grinding, the raised surface of the electric semi-cam 1 214 abuts against the pipe surface, which can maintain the stability of the pipe when it is grinding, avoid the pipe from shifting or rotating, and improve the accuracy of the grinding operation. When the transfer unit 2 transfers the pipe to the receiving unit 3, when the pipe moves over the electric semi-cam 2 33 on the support bracket 2 31 and reaches the bending position of the support bracket 2 31, the electric semi-cam 2 33 rotates, and its raised surface abuts against the pipe, which can avoid the pipe from shifting, improve the stability of the pipe when the support bracket 2 31 is rotating and resetting, and further improve the safety of the pipe transfer operation.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe joint grinding device, characterized in that: The invention comprises a plurality of transmission units (1) arranged in parallel, a plurality of transfer units (2) capable of carrying pipes, and a grinding unit (4) arranged in parallel with the transmission units (1), wherein the plurality of transfer units (2) are respectively inserted between the plurality of transmission units (1), and the pipe can move along the distribution direction of the transmission units (1) and the transfer units (2) until both ends thereof are connected to the grinding unit (4); A receiving unit (3) is provided on one side of each transfer unit (2); when a plurality of transfer units (2) transfer pipelines along a direction perpendicular to their distribution direction, the receiving unit (3) can receive the transferred pipelines.

2. The pipe joint grinding device according to claim 1, characterized in that: The conveying unit (1) comprises a first electric conveying roller (11) and a second electric conveying roller (12); the first electric conveying roller (11) and the second electric conveying roller (12) are respectively opposite to the transfer unit (2) and the receiving unit (3); and the first electric conveying roller (11) and the second electric conveying roller (12) are both arranged on the same supporting frame (13).

3. The pipe joint grinding device according to claim 1, characterized in that: The transfer units (2) each include a support bracket (21) distributed in a V-shaped structure, the bending position of the support bracket (21) is connected to a lifting frame (22) via a rotating shaft, a first base (27) is provided below the lifting frame (22), and a first cylinder (28) is provided on the first base (27) for controlling the movement of the lifting frame (22); The lifting frame (22) is provided with a motor that can control the rotating shaft and the supporting bracket (21) to rotate synchronously. As the supporting bracket (21) rotates, the orientation position of its open end changes, and the pipeline can slide along the inclined surface of the supporting bracket (21).

4. The pipe joint grinding device according to claim 3, characterized in that: The rotating shaft is provided with a driving gear (23); the lifting frame (22) is provided with a linkage gear (24) located directly below the driving gear (23) and meshing with the driving gear (23); the linkage gear (24) is provided with a linkage shaft (25) extending to the inside of the lifting frame (22) at the central axis position; the linkage shaft (25) is provided with an arc-shaped supporting arm (26); when the supporting bracket (21) rotates, the arc-shaped supporting arm (26) rotates in the opposite direction to the supporting bracket (21) until it abuts against the bottom of the frame of the supporting bracket (21).

5. The pipe joint grinding device according to claim 4, characterized in that: A pair of guide rollers (211) arranged along an inclined direction are embedded on the two symmetrically distributed frames of the support bracket (21), the ends of the guide rollers (211) extend to the outside of the support bracket (21), a motor is provided outside the support bracket (21) for controlling the rotation of one of the pair of guide rollers (211), and the ends of the pair of guide rollers (211) are provided with synchronous wheels (212), and two adjacent synchronous wheels (212) are connected by a synchronous belt (213), and when the pipeline slides along the inclined direction of the frame of the support bracket (21) distributed downward, the pair of guide rollers (211) located on the frame rotate synchronously.

6. The pipe joint grinding device according to claim 3, characterized in that: The receiving unit (3) comprises a supporting bracket (31) with a V-shaped structure, the bending position of the supporting bracket (31) is connected to a lifting frame (34) via a rotating shaft, a second base (35) is provided below the lifting frame (34), and a second cylinder (36) is provided on the second base (35) for controlling the movement of the lifting frame (34); The lifting frame 2 (34) is provided with a motor capable of controlling the rotating shaft and the synchronous rotation of the supporting bracket 2 (31). The supporting bracket 2 (31) is provided with an extension boss (32) at the frame end close to the supporting bracket 1 (21). As the supporting bracket 2 (31) rotates, the orientation position of its opening end corresponds to the orientation position of the opening end of the supporting bracket 1 (21), and the extension boss (32) moves to the front and rear of the supporting bracket 1 (21).

7. The pipe joint grinding device according to claim 6, characterized in that: The two symmetrically distributed frames of the support bracket one (21) and the frame of the support bracket two (31) close to the support bracket one (21) are respectively embedded with a rotatable electric half cam one (214) and an electric half cam two (33). As the electric half cam one (214) and the electric half cam two (33) rotate, their convex surfaces and concave surfaces switch positions.

8. The pipe joint polishing device according to claim 1, characterized in that: The grinding unit (4) comprises an outer grinding wheel (41) and an inner grinding wheel (42) which can respectively perform grinding operations on the inner and outer walls of the pipeline; the outer grinding wheel (41) and the inner grinding wheel (42) are arranged on the same docking frame (43); the docking frame (43) is connected to an electric rocker arm (44) via a hydraulic push rod; the electric rocker arm (44) is provided with a follower gear frame (45); the follower gear frame (45) is arranged on a frame; the frame is provided with a driving gear plate (46) meshing with the follower gear frame (45) and a motor capable of controlling the rotation of the driving gear plate (46).

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