A pipe joint grinding device

Abstract

The present invention discloses a pipe joint grinding device, which relates to the technical field of pipe processing equipment and includes a plurality of conveying units arranged in parallel, a plurality of transfer units capable of carrying pipes, and a grinding unit arranged in parallel with the conveying units. The plurality of transfer units are respectively inserted between the plurality of conveying units, and the pipe can move along the distribution direction of the conveying units and the transfer units until both ends thereof are docked with the grinding unit. A receiving unit is provided on one side of each transfer unit. When the plurality of transfer units transfer the pipe along a direction perpendicular to its distribution direction, the receiving unit can receive the transferred pipe. The present invention reduces the time required for blanking and replenishing materials at the grinding station. Moreover, it enables the processed pipe not to wait for the transportation equipment to arrive before carrying out the transfer operation, and can improve the efficiency of pipe grinding work when grinding pipes with large volumes and difficult transportation processes.

Description

Technical Field

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

[0002] Pipeline joint grinding is a common pipeline installation and maintenance technique. During the pipeline production process, it is mainly used to improve the sealing performance and connection strength of pipeline joints. During the grinding process, it is first necessary to ensure that the surface of the pipeline joint is clean, free of oil stains and rust. Sandpaper or a steel brush can be used for cleaning. If the pipeline joint is rusty, rust removal treatment needs to be carried out first. Then, according to the material and shape of the pipeline joint, a suitable grinding wheel is selected. Generally speaking, a grinding wheel can be selected for metal pipeline joints, while sandpaper needs to be selected for plastic pipeline joints. During the grinding process, the grinding wheel or sandpaper is fixed on a grinding machine, and then grinding is carried out along the axial direction of the pipeline joint. During grinding, the contact force between the grinding wheel or sandpaper and the surface of the pipeline joint should be moderate, avoiding being too tight or too loose. At the same time, the grinding speed should be kept stable, avoiding being too fast or too slow. After grinding is completed, it is necessary to check whether the surface of the pipeline joint is smooth and whether there are uneven places. If so, grinding needs to be continued until the surface is smooth.

[0003] For existing pipeline joint grinding devices, for metal pipelines with a relatively large volume and a certain length, in order to save time, usually two sets of equipment are used to simultaneously perform grinding operations on the joints of the pipelines. In order to save human resources, pipelines with a relatively large volume mostly need to be moved to the grinding station through conveyor rollers. After the grinding operation is completed, the conveyor rollers rotate again to move the pipeline out of the grinding station. During this process, due to the relatively large volume of the pipeline, it takes a long time to move, and the subsequent pipelines to be ground also need to wait until the pipeline is completely moved out of the grinding station before they can fill the position and perform the grinding operation again, thereby affecting the efficiency of pipeline grinding work. Therefore, the present application provides a pipeline joint grinding device to meet the requirements. Summary of the Invention

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

[0005] To achieve the above object, the present application provides the following technical solution: A pipeline joint grinding device includes a plurality of conveying units arranged in parallel, a plurality of transfer units capable of carrying pipelines, and a grinding unit arranged in parallel with the conveying units. The plurality of transfer units are respectively interspersed between the plurality of conveying units, and the pipeline can move along the distribution direction of the conveying units and the transfer units until both ends thereof are butted against the grinding unit.

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

[0007] Further, each of the conveying units includes a first electric conveying roller and a second electric conveying roller. The first electric conveying roller and the second electric conveying roller are respectively facing the transfer unit and the receiving unit, and both the first electric conveying roller and the second electric conveying roller are arranged on the same support frame.

[0008] Further, each of the transfer units includes a support bracket one distributed in a V-shaped structure. The bending positions of the support bracket one are all connected with a lifting frame one through a rotating shaft. A first base is arranged below the lifting frame one, and a first air cylinder capable of controlling the movement of the lifting frame one is arranged on each first base.

[0009] A motor capable of controlling the synchronous rotation of the rotating shaft and the support bracket one is arranged outside the lifting frame one. As the support bracket one rotates, the orientation position of its open end changes, and the pipeline can slide along the inclined surface of the support bracket one.

[0010] Further, a driving gear is arranged on the rotating shaft, and a linkage gear meshing with and located directly below the driving gear is arranged outside the lifting frame one. A linkage shaft extending into the interior of the lifting frame one is arranged at the central axis position of the linkage gear, and an arc-shaped support arm is arranged on the linkage shaft. When the support bracket one rotates, the arc-shaped support arm rotates in the direction opposite to that of the support bracket one until it abuts against the lower part of the frame body of the support bracket one.

[0011] Further, a pair of guiding rollers arranged along the inclined direction are embedded on the two symmetrically distributed frame bodies of the support bracket one. The ends of the guiding rollers all extend to the outside of the support bracket one. A motor capable of controlling the rotation of one of the pair of guiding rollers is arranged outside the support bracket one. Synchronous wheels are arranged at the ends of the pair of guiding rollers, and adjacent two synchronous wheels are connected by a synchronous belt. When the pipeline slides along the inclined direction of the downward-distributed frame body of the support bracket one, the pair of guiding rollers on this frame body rotate synchronously.

[0012] Further, the receiving unit includes a support bracket two distributed in a V-shaped structure. The bending positions of the support bracket two are all connected with a lifting frame two through a rotating shaft. A second base is arranged below the lifting frame two, and a second air cylinder capable of controlling the movement of the lifting frame two is arranged on each second base.

[0013] A motor capable of controlling the synchronous rotation of the rotating shaft and the support bracket two is arranged outside the lifting frame two. An extension boss is arranged at the end of the frame body of the support bracket two close to the support bracket one. As the support bracket two rotates, the orientation position of its open end corresponds to the orientation position of the open end of the support bracket one, and the extension boss moves to the front and rear of the support bracket one.

[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 Schematic diagram of the docking state of multiple transfer units and multiple receiving units of the present invention.

[0024] Figure 5 Schematic diagram of the structures of the transfer unit, transfer unit and receiving unit of the present invention.

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

[0026] Figure 7 Schematic diagram of the structure of the transfer unit of the present invention.

[0027] Figure 8 Schematic diagram of the structure of the transfer unit from a second perspective of the present invention.

[0028] Figure 9 Schematic diagram of the structure of the receiving unit of the present invention.

[0029] Figure 10 Schematic diagram of the structure of the grinding unit of the present invention.

[0030] In the figure: 1. Transfer unit; 11. First electric conveyor roller; 12. Second electric conveyor roller; 13. Support stand; 2. Transfer unit; 21. First support bracket; 22. First lifting frame; 23. Driving gear; 24. Linkage gear; 25. Linkage shaft; 26. Arc-shaped support arm; 27. First base; 28. First cylinder; 211. Guide roller; 212. Synchronous pulley; 213. Synchronous belt; 214. First electric semi-cam; 3. Receiving unit; 31. Second support bracket; 32. Extension boss; 33. Second electric semi-cam; 34. Second lifting frame; 35. Second base; 36. Second cylinder; 4. Grinding unit; 41. Outer grinding wheel; 42. Inner grinding wheel; 43. Docking frame; 44. Electric swing arm; 45. Follow-up gear rack; 46. Driving gear disc. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Example 1: Refer to Figure 1-4A pipe joint grinding device as shown includes a plurality of parallel arranged conveying units 1, a plurality of transfer units 2 capable of carrying pipes, and a grinding unit 4 arranged in parallel with the conveying units 1. The plurality of transfer units 2 are respectively inserted between the plurality of conveying units 1. The pipe can move along the distribution direction of the conveying units 1 and the transfer units 2 until both ends thereof are butted against the grinding unit 4.

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

[0034] Specifically, as Figure 5 shown, each 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 both the first electric conveying roller 11 and the second electric conveying roller 12 are arranged on the same support frame 13. Before the pipe undergoes grinding operation, the first electric conveying roller 11 can guide the pipe to move linearly along its distribution direction until both ends of the pipe are butted against the grinding unit 4.

[0035] As Figure 1 、 10 shown, the grinding unit 4 includes an outer grinding wheel 41 and an inner grinding wheel 42 capable of respectively performing grinding operations on the inner and outer walls of the pipe. 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 with an electric swing arm 44 through a hydraulic push rod. Before performing the grinding operation, the electric swing arm 44 can control the docking frame 43, the outer grinding wheel 41 and the inner grinding wheel 42 to deflect above the pipe. After the pipe is butted against the grinding unit 4, the electric swing arm 44 can control the docking frame 43 to rotate to a position facing the pipe. Subsequently, the hydraulic push rod outputs, and can control the inner grinding wheel 42 and the outer grinding wheel 41 to move to the inner and outer sides of the pipe 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 pipe joint and perform a comprehensive grinding operation on the pipe joint, a follower gear rack 45 is provided on the electric swing arm 44. The follower gear rack 45 is arranged on the machine frame. A driving gear disk 46 meshing with the follower gear rack 45 and a motor capable of controlling the rotation of the driving gear disk 46 are provided on the machine frame. When the motor drives the driving gear disk 46 to rotate, the follower gear rack 45 meshing with it 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 pipe joint to different positions of the joint, and a comprehensive grinding operation can be performed on the pipe joint.

[0037] As Figures 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 Figure 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 pipeline is moved inside the receiving unit 3, the motor drives the second support bracket 31 to reset, maintaining the stability of the pipeline. Further processing operations can be performed on the pipeline located inside the receiving unit 3. At this time, the pipeline to be polished subsequently has been transferred above the transfer unit 2 by the first electric conveyor roller 11 again. The transfer unit 2 can carry the pipeline again, enabling the polishing unit 4 to perform the polishing operation on the subsequent pipeline again. If no further processing operations need to be performed on the pipeline, the second cylinder 36 can drive the second lifting frame 34 and the pipeline carried inside it to descend and reset, causing the second support bracket 31 to descend to a specified height, and the pipeline to come into contact with the surface of the second electric conveyor roller 12.

[0043] In the above process, by means of the movable docking of the transfer unit 2 and the receiving unit 3, the pipeline can be horizontally moved away from the polishing station. After leaving the polishing station, the pipeline can move again along the same direction as the pipeline feeding direction. Compared with the pipeline moving, discharging, and replenishing materials at the original polishing station, this method reduces the time required for discharging and replenishing materials at the polishing station. And it enables the processed pipeline to be transferred without waiting for the transportation equipment to arrive, and the pipeline to be polished subsequently can also arrive quickly, improving the speed of pipeline material replacement. When polishing pipelines with large volumes and difficult transportation processes, the efficiency of pipeline polishing work can be improved.

[0044] Embodiment 2: A driving gear 23 is provided on the rotating shaft. An interlocking gear 24 that meshes with and is located directly below the driving gear 23 is provided outside the first lifting frame 22. A linkage shaft 25 extending into the interior of the first lifting frame 22 is provided at the central axis position of the interlocking gear 24. An arc-shaped support arm 26 is provided on the linkage shaft 25. When the first support bracket 21 rotates and the pipeline slides along the inclined surface of the first support bracket 21, the driving gear 23 rotates synchronously. Under the meshing force between the driving gear 23 and the interlocking gear 24, the rotating direction of the linkage shaft 25 is opposite to that of the rotating shaft, and the arc-shaped support arm 26 rotates along the direction opposite to that of the first support bracket 21 until it abuts against the lower part of the frame body of the first support bracket 21 to support the first support bracket 21.

[0045] During the process of the pipeline sliding along the inclined surface of the first support bracket 21, the pressure damage to the first support bracket 21 and the rotating shaft at its central position caused by the movement of the pipeline is effectively reduced, improving the compressive resistance and structural strength of the first support bracket 21. It can prevent the first support bracket 21 from shaking during the movement of the pipeline, improving the stability of the first support bracket 21 when guiding the large-volume pipeline to slide down, further improving the accuracy when the second support bracket 31 is docked with the first support bracket 21, and ensuring the working efficiency during pipeline transfer.

[0046] Embodiment 3: A pair of guide rollers 211 arranged along an inclined direction are embedded on each of the two symmetrically distributed frames of the first support bracket 21. The ends of the guide rollers 211 extend to the outside of the first support bracket 21. A motor capable of controlling the rotation of one of the pair of guide rollers 211 is provided outside the first support bracket 21. Synchronous wheels 212 are provided at the ends of the pair of guide rollers 211, and adjacent synchronous wheels 212 are connected by a synchronous belt 213. When the pipeline is transferred into the receiving unit by the transfer unit, when the pipeline slides along the inclined direction of the downwardly distributed frame of the first support bracket 21, the motor drives the rotation of one of the pair of guide rollers 211, and the synchronous wheel 212 provided on the guide roller 211 rotates synchronously. Under the connection action 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: Rotatable electric semi-cams 214 and electric semi-cams 33 are respectively embedded on the two symmetrically distributed frames of the first support bracket 21 and the frame of the second support bracket 31 close to the first support bracket 21. As the electric semi-cams 214 and electric semi-cams 33 rotate, the positions of their convex surfaces and concave surfaces are switched.

[0048] When the pipeline is placed on the transfer unit 2 for grinding operation, the convex surface of the electric semi-cam 214 abuts against the surface of the pipeline, which can maintain the stability of the pipeline during the grinding operation, prevent the pipeline from shifting and rotating, and improve the accuracy of the grinding operation. When the transfer unit 2 transfers the pipeline to the receiving unit 3, when the pipeline moves past the electric semi-cam 33 on the frame of the second support bracket 31 and reaches the bending position of the second support bracket 31, the electric semi-cam 33 rotates, and its convex surface abuts against the pipeline, which can prevent the pipeline from shifting, improve the stability of the pipeline when the second support bracket 31 carries the pipeline to rotate and reset, and further improve the safety of the pipeline transfer operation.

[0049] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall 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 of the transfer units (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. 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); 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 1 (22) is provided with a motor capable of controlling the rotating shaft and the synchronous rotation of the supporting bracket 1 (21). As the supporting bracket 1 (21) rotates, the orientation position of the opening end thereof changes, and the pipe can slide along the inclined surface of the supporting bracket 1 (21); 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).

2. The pipe joint grinding device according to claim 1, 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.

3. The pipe joint grinding device according to claim 1, 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).

4. The pipe joint grinding device according to claim 3, 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.

5. 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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