A device for grinding the inner wall of a seamless steel pipe

Abstract

The application discloses a seamless steel pipe inner wall grinding device, and belongs to the technical field of seamless steel pipe manufacturing. The seamless steel pipe inner wall grinding device comprises a honing machine, and further comprises a machine table, a grinding part, a center support, a support frame, a center support part and two parallel tracks. The two tracks are fixedly arranged on the machine table. The center support is slidably arranged on the track. The support frame and the center support are located between the center support part and the grinding part. The bottom of the center support is fixedly provided with a horizontal plate. The side wall of the track is provided with a plurality of insertion holes. The horizontal plate and the sliding block are jointly provided with a fixing mechanism. The position of the center support and the center rod is adjusted, so that the center rod can support the inner wall of the seamless steel pipe during the process of grinding the inner wall of the seamless steel pipe, thereby avoiding the slight deformation of the seamless steel pipe, and the grinding effect of the inner wall of the seamless steel pipe is improved.

Description

Technical Field

[0001] This invention belongs to the field of seamless steel pipe manufacturing technology, specifically relating to a device for grinding the inner wall of a seamless steel pipe. Background Technology

[0002] Seamless steel pipes have no weld seams, resulting in a continuous and uniform overall structure. This allows them to withstand higher internal and external pressures. Furthermore, the chemical composition, metallographic structure, and mechanical properties of the entire pipe are highly uniform, without the heat-affected zone that may result from the welding process. This uniformity gives seamless steel pipes higher reliability and a longer service life under harsh working conditions, significantly reducing the risk of failure.

[0003] Chinese Patent No. CN117718814A discloses an inner wall grinding device and grinding method for seamless steel pipe processing. This invention sets the device itself to be able to move forward and backward and rotate circumferentially, and the rotation and displacement of the device can be performed simultaneously, that is, to perform automatic circumferential grinding and displacement. The entire process does not require the steel pipe to be rotated or displaced. Only the steel pipe needs to be fixed to realize the automatic grinding operation. There is no need to stop the rotation and then move the displacement, which significantly improves the overall grinding efficiency and the degree of automation.

[0004] The commonly used machine for grinding the inner wall of seamless steel pipes is a honing machine. Its main working principle is to use an expandable honing head with several honing stones to rotate and reciprocate inside the steel pipe. At the same time, the honing stones expand outward to apply pressure, thus finishing the inner wall of the seamless steel pipe. However, for slender seamless steel pipes, when processing one end, the lack of rigidity causes the middle part of the slender part to bend during processing. The bending angle is small and usually difficult for workers to detect in time, resulting in lower processing quality for slender seamless steel pipes. Therefore, a center frame is usually used for support during the grinding process. When clamping slender parts, the center frame only clamps the outer wall of the slender seamless steel pipe, while the inner wall of the seamless steel pipe lacks support. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a device for grinding the inner wall of a seamless steel pipe.

[0006] The technical solution adopted to solve the above technical problems is: A seamless steel pipe inner wall grinding device includes a honing machine, and further includes: The honing machine includes a machine base, a grinding section, a central frame, a support frame, a central support section, and two parallel tracks. Both tracks are fixedly mounted on the machine base. The central frame is slidably mounted on the tracks. The support frame and the central frame are located between the central support section and the grinding section. A horizontal plate is fixedly installed at the bottom of the central frame, and sliders are fixedly installed on the bottom of both sides of the horizontal plate. The two sliders are slidably connected to two tracks. Several insertion holes are opened on the side wall of the track. A fixing mechanism is provided between the horizontal plate and the sliders. The central support includes a central rod and an electric actuator. The output end of the electric actuator is threaded to the central rod. The central rod passes through the support frame and the central frame in sequence. The side wall of the central rod is provided with several annular grooves. A motion groove is provided between the two tracks. A positioning plate is slidably connected in the motion groove. The side wall of the support frame is provided with a synchronization mechanism for driving the positioning plate.

[0007] By adjusting the positions of the center frame and the center rod through the above technical solution, the center rod can support the inner wall of the seamless steel pipe during the grinding process, thereby preventing the seamless steel pipe from undergoing minor deformation and improving the grinding effect on the inner wall of the seamless steel pipe.

[0008] Furthermore, the fixing mechanism includes a pull ring, a rotating rod, a translation block, a lifting wheel, a top plate, a bottom spring, and a plug rod. The pull ring is fixedly connected to the side wall of the rotating rod. A motion cavity is formed inside the horizontal plate, and a through hole is formed on the side wall of the motion cavity. The rotating rod passes through the through hole, and the end of the rotating rod away from the pull ring is rotatably connected to the side wall of the translation block. The translation block is slidably connected to the side wall of the motion cavity. Slopes are formed at both ends of the translation block. A through hole is formed on the side wall of the slider, and the plug rod passes through the through hole and is inserted into the plug hole. The top plate is fixedly set on the top of the plug rod. The bottom spring is wrapped around the outside of the plug rod, and one end of the bottom spring is fixedly connected to the bottom of the top plate. The lifting wheel is rotatably connected to the top of the top plate, and the lifting wheel abuts against the slope.

[0009] With the above technical solution, by pulling the pull ring outward, the rotating rod can move the translation block together towards the pull ring, thereby changing the position of the ramp relative to the lifting wheel. The lifting wheel will then move along the ramp, thus causing the top plate and the insertion rod to rise together. The bottom spring will provide assistance for the rise of the top plate and the insertion rod. The insertion rod, which was originally inserted into the insertion hole, will disengage from the insertion hole, making it convenient for the staff to adjust the position of the center frame.

[0010] Furthermore, a limit rod is fixedly provided on the side wall of the rotating rod, an annular block is provided at the bottom of the moving cavity, a vertical groove is provided on the inner wall of the annular block, the end of the vertical groove facing the pull ring is open, the other end of the vertical groove is connected to an arc groove, the limit rod is slidably connected to the inner wall of the arc groove, and the end of the arc groove away from the vertical groove is magnetically connected to the limit rod.

[0011] With the above technical solution, if the worker wants to pull out the pull ring, he needs to rotate the pull ring first, so that the pull ring drives the rotating rod to rotate together. The limiting rod, which was originally restricted in the arc groove by magnetic force, will slide under the action of external force and then move into the vertical groove. Then the worker can pull out the pull ring.

[0012] Furthermore, two side springs are fixedly installed on the side wall of the translation block, and the ends of the two side springs away from the translation block are fixedly connected to the side wall of the motion cavity.

[0013] With the above technical solution, the force applied to the translation block by the side spring will keep the translation block in its current position, that is, the lifting wheel is at the high point of the slope. At this time, the insertion rod will remain inserted into the insertion hole, and the central frame will be fixed in the current position.

[0014] Furthermore, a threaded rod is rotatably connected to the side wall of the motion cavity, and a displacement block is externally threaded onto the threaded rod. A transverse groove is opened on each side wall of the displacement block, and a connecting rod is slidably connected in the transverse groove. The other ends of the two connecting rods are fixedly connected to the side wall of the translation block, and a fixing rod is fixedly installed on the other end of the threaded rod. A fixing groove is opened on the side wall of the translation block, and the fixing rod is inserted into the fixing groove.

[0015] With the above technical solution, when the fixed rod is inserted into the fixed groove, it can be ensured that the threaded rod will not rotate and the displacement block will not move. The connection rod and the transverse groove are designed to ensure that when the translation block is pulled outward, the connection rod can slide in the transverse groove first, so that the fixed rod leaves the fixed groove first, and then the fixed rod will rotate with the threaded rod under the action of the displacement block.

[0016] Furthermore, a back baffle is fixedly installed on the side wall of the horizontal plate away from the pull ring, an intercepting plate is rotatably connected to the bottom of the horizontal plate, a motion hole is opened at the bottom of the motion cavity, and a diagonal rod is rotatably connected to the bottom of the displacement block. The diagonal rod passes through the motion hole and is rotatably connected to the side wall of the intercepting plate.

[0017] With the above technical solution, when the displacement block moves along the direction of the threaded rod, the inclined rod will drive the intercepting plate to rotate together, thereby making the originally upright intercepting plate gradually become an inclined state that does not affect the movement, so that it can move along the track direction together with the central frame.

[0018] Furthermore, the synchronization mechanism includes a swing rod, a top rod, a bottom rod, two support rods, and two tension springs. The two support rods are respectively fixedly mounted on the side wall of the support frame. The middle position of the swing rod is rotatably connected to the side wall of the two support rods. The top rod is fixedly mounted on the top of the swing rod and abuts against one of the annular grooves. The bottom rod is fixedly mounted on the bottom of the swing rod. Several ratchet teeth are fixedly mounted on the top of the positioning plate. The end of the bottom rod facing away from the support frame has an arc design, and the bottom rod abuts against the ratchet teeth. The two tension springs are respectively fixedly mounted between the swing rod and the support frame.

[0019] With the above technical solution, when the center rod is pushed outward by the electric actuator, several annular grooves on the side wall of the center rod will pass through the position of the top rod in sequence, thereby causing the top rod to drive the swing rod to swing. The bottom rod set at the bottom of the swing rod will drive the ratchet and the positioning plate to move towards the center frame. The tension spring can bring the swing rod back to the initial position after the swing rod is driven to rotate by the top rod.

[0020] Furthermore, the bottom of the support frame is provided with a clearance hole, the height of which is greater than the sum of the heights of the positioning plate and the ratchet, and the width of which is greater than the width of the positioning plate.

[0021] Through the above technical solution, the setting of the clearance hole allows the positioning plate and ratchet to pass safely through the support frame. Moreover, the design of the clearance hole also facilitates the rotation of the swing rod, and avoids accidental friction between the support frame side wall and the swing rod during the swinging process.

[0022] Furthermore, the higher part of the ramp is located near the end of the translation block close to the pull ring, and the lifting wheel abuts against the side wall of the higher part of the ramp.

[0023] With the above technical solution, in the initial state, the lifting wheel will be at the high point of the slope, at which time the insertion rod will be inserted into the insertion hole, and the position of the center seat will be fixed in the current position, thereby ensuring the support effect for the seamless steel pipe.

[0024] Furthermore, the end of the positioning plate facing the grinding part does not exceed the position of the center frame, and the height of the ratchet at the top of the positioning plate is less than the height of the bottom of the horizontal plate.

[0025] With the above technical solution, the position of the positioning plate is neither flush with the center rod nor with the center frame. The specific length can be adjusted by the staff according to the needs. In general, it is only necessary to ensure that when the positioning plate contacts the intercepting plate, the center rod has exceeded half of the seamless steel pipe that needs to be ground.

[0026] The beneficial effects of this invention are as follows: (1) By adjusting the position of the center frame and the center rod, the center rod can support the inner wall of the seamless steel pipe during the grinding process. Even if the center rod passes through the seamless steel pipe and the workers cannot see the position of the center rod from the outside, they can still know whether the center rod is in place by observing the position relationship between the positioning plate and the intercepting plate, thereby avoiding the seamless steel pipe from undergoing slight deformation and improving the grinding effect on the inner wall of the seamless steel pipe. (2) By setting a limiting rod and an annular block on the side wall of the rotating rod, the present invention requires the worker to rotate the ring first when he wants to pull out the ring. The ring drives the rotating rod to rotate together. The limiting rod, which was originally restricted in the arc groove by magnetic force, will slide under the action of external force and move into the vertical groove. Then the worker can pull out the ring. The setting of the limiting rod and the annular block ensures that the position of the translation block will not change easily without the action of external force. Therefore, when the positioning plate hits the intercepting plate, the intercepting plate will not be lifted. (3) By setting a synchronization mechanism and a positioning plate at the bottom of the support frame, when the center rod is pushed outward by the electric push rod, several annular grooves on the side wall of the center rod will pass through the position of the top rod in sequence, thereby causing the top rod to drive the swing rod to swing. The bottom rod set at the bottom of the swing rod will drive the ratchet and the positioning plate to move towards the center frame. The positioning plate will move together with the center rod. The staff can deduce the position of the center rod inside the seamless steel pipe by observing the position of the positioning plate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal central frame of the present invention; Figure 3 This is a schematic diagram of the fixing mechanism in this invention; Figure 4 yes Figure 3 A magnified view of part A in the middle; Figure 5 This is a cross-sectional view of the horizontal plate in this invention; Figure 6 yes Figure 5 A magnified view of part B in the middle section; Figure 7 This is a cross-sectional view of the annular block in this invention; Figure 8 This is a schematic diagram of the structural connection between the support frame and the central support part in this invention; Figure 9 This is a cross-sectional view of the central support portion of the present invention; Figure 10 This is a schematic diagram of the synchronization mechanism in this invention; Figure 11 yes Figure 10 A magnified view of part C in the middle.

[0028] Reference numerals: 1. Machine base; 2. Grinding section; 3. Center frame; 4. Support frame; 5. Track; 6. Horizontal plate; 7. Slider; 8. Insertion hole; 9. Center rod; 10. Electric actuator; 11. Annular groove; 12. Motion groove; 13. Positioning plate; 14. Pull ring; 15. Rotating rod; 16. Translation block; 17. Lifting wheel; 18. Top plate; 19. Bottom spring; 20. Insertion rod; 21. Through hole; 22. Slope; 23. Through hole; 4. Limiting rod; 25. Annular block; 26. Vertical groove; 27. Arc groove; 28. Side spring; 29. ​​Threaded rod; 30. Displacement block; 31. Horizontal groove; 32. Connecting rod; 33. Fixing rod; 34. Fixing groove; 35. Back baffle; 36. Interceptor plate; 37. Motion hole; 38. Diagonal rod; 39. Swing rod; 40. Top rod; 41. Bottom rod; 42. Support rod; 43. Tension spring; 44. Ratchet; 45. Clearance hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] like Figure 1 As shown, this embodiment provides a seamless steel pipe inner wall grinding device, including a honing machine, and further comprising: The honing machine includes a machine base 1, a grinding section 2, a central frame 3, a support frame 4, a central support section, and two parallel tracks 5. Both tracks 5 are fixedly mounted on the machine base 1, the central frame 3 is slidably mounted on the tracks 5, and the support frame 4 and the central frame 3 are located between the central support section and the grinding section 2.

[0031] from Figure 2 - Figure 4As can be seen, a horizontal plate 6 is fixedly installed at the bottom of the central frame 3, and sliders 7 are fixedly installed on both sides of the bottom of the horizontal plate 6. The two sliders 7 are slidably connected to two tracks 5 respectively. Several insertion holes 8 are opened on the side wall of the track 5. A fixing mechanism is provided between the horizontal plate 6 and the sliders 7. The fixing mechanism includes a pull ring 14, a rotating rod 15, a translation block 16, a lifting wheel 17, a top plate 18, a bottom spring 19, and an insertion rod 20. The pull ring 14 is fixedly connected to the side wall of the rotating rod 15. A motion cavity is opened inside the horizontal plate 6, and a through hole 21 is opened on the side wall of the motion cavity. Rod 15 passes through hole 21. The end of rotating rod 15 away from pull ring 14 is rotatably connected to the side wall of translation block 16. Translation block 16 is slidably connected to the side wall of motion cavity. Two side springs 28 are fixedly installed on the side wall of translation block 16. The ends of the two side springs 28 away from translation block 16 are fixedly connected to the side wall of motion cavity. The force applied by the side springs 28 to translation block 16 will keep translation block 16 in the current position, that is, the lifting wheel 17 is at the high point of slope 22. At this time, the insertion rod 20 will remain inserted in the insertion hole 8, and the center frame 3 will be fixed in the current position.

[0032] The translation block 16 has ramps 22 at both ends, and the slider 7 has a through hole 23 on its side wall. The insertion rod 20 passes through the through hole 23 and is inserted into the insertion hole 8. The top plate 18 is fixedly set on the top of the insertion rod 20. The bottom spring 19 is wrapped around the outside of the insertion rod 20. One end of the bottom spring 19 is fixedly connected to the bottom of the top plate. The lifting wheel 17 is rotatably connected to the top of the top plate 18. The lifting wheel 17 abuts against the ramp 22. The high point of the ramp 22 is located at the end of the translation block 16 near the pull ring 14. The lifting wheel 17 abuts against the side wall of the high point of the ramp 22. In the initial state, the lifting wheel 17 will be at the high point of the ramp 22. At this time, the insertion rod 20 will be inserted into the insertion hole 8. The position of the center seat will also be fixed in the current position, thereby ensuring the support effect for the seamless steel pipe.

[0033] Reference Figure 5 and Figure 7 As can be seen, a limiting rod 24 is fixedly installed on the side wall of the rotating rod 15, and an annular block 25 is opened at the bottom of the moving cavity. A vertical groove 26 is opened on the inner wall of the annular block 25. The end of the vertical groove 26 facing the pull ring 14 is open, and the other end of the vertical groove 26 is connected to an arc groove 27. The limiting rod 24 is slidably connected to the inner wall of the arc groove 27. The end of the arc groove 27 away from the vertical groove 26 is magnetically connected to the limiting rod 24. If the operator wants to pull out the pull ring 14, he / she needs to rotate the pull ring 14 first, so that the pull ring 14 drives the rotating rod 15 to rotate together. The limiting rod 24, which was originally magnetically restricted in the arc groove 27, will slide under the action of external force and move into the vertical groove 26. Then the operator can pull out the pull ring 14.

[0034] In conjunction with references Figure 5 and Figure 6As can be seen from the content, a threaded rod 29 is rotatably connected to the side wall of the motion cavity. A displacement block 30 is externally threaded to the threaded rod 29. A transverse groove 31 is opened on each side wall of the displacement block 30. A connecting rod 32 is slidably connected in the transverse groove 31. The other ends of the two connecting rods 32 are fixedly connected to the side wall of the translation block 16. A fixing rod 33 is fixedly installed on the other end of the threaded rod 29. A fixing groove 34 is opened on the side wall of the translation block 16. The fixing rod 33 is inserted into the fixing groove 34. When the fixing rod 33 is inserted into the fixing groove 34, it can ensure that the threaded rod 29 will not rotate, and the displacement block 30 will not move. The setting of the connecting rod 32 and the transverse groove 31 ensures that when the translation block 16 is pulled outward, the connecting rod 32 can slide in the transverse groove 31 first, so that the fixing rod 33 leaves the fixing groove 34 first, and then the fixing rod 33 will rotate with the threaded rod 29 under the action of the displacement block 30.

[0035] from Figure 2 , Figure 5 as well as Figure 6 As can be seen, a back baffle 35 is fixedly installed on the side wall of the horizontal plate 6 away from the pull ring 14. An intercepting plate 36 is rotatably connected to the bottom of the horizontal plate 6. A motion hole 37 is opened at the bottom of the motion cavity. A diagonal rod 38 is rotatably connected to the bottom of the displacement block 30. The diagonal rod 38 passes through the motion hole 37 and is rotatably connected to the side wall of the intercepting plate 36. When the displacement block 30 moves along the direction of the threaded rod 29, the diagonal rod 38 will drive the intercepting plate 36 to rotate together, so that the originally upright intercepting plate 36 gradually becomes an inclined state that does not affect the movement, so that it can move along the direction of the track 5 together with the central frame 3.

[0036] from Figure 8 - Figure 9 As can be seen from the content, the central support includes a central rod 9 and an electric actuator 10. The output end of the electric actuator 10 is threadedly connected to the central rod 9. The central rod 9 passes through the support frame 4 and the central frame 3 in sequence. Several annular grooves 11 are opened on the side wall of the central rod 9. A motion groove 12 is opened between the two tracks 5. A positioning plate 13 is slidably connected in the motion groove 12. The distance between the several annular grooves 11 is consistent. The side wall of the annular groove 11 can also be set as an arc design to facilitate sliding.

[0037] Reference Figure 10 - Figure 11As can be seen from the content, the support frame 4 has a synchronization mechanism on its side wall for driving the positioning plate 13. The synchronization mechanism includes a swing rod 39, a top rod 40, a bottom rod 41, two support rods 42, and two tension springs 43. The two support rods 42 are respectively fixedly installed on the side wall of the support frame 4. The middle position of the swing rod 39 is rotatably connected to the side wall of the two support rods 42. The top rod 40 is fixedly installed on the top of the swing rod 39 and abuts against one of the annular grooves 11. The bottom rod 41 is fixedly installed on the bottom of the swing rod 39. Several ratchet teeth 44 are fixedly installed on the top of the positioning plate 13. The bottom of the support frame 4 has a clearance hole 45. The height of the clearance hole 45 is greater than the height of the positioning plate 13 and the ratchet teeth 44. The width of the clearance hole 45 is greater than the width of the positioning plate 13. The bottom rod 41 has an arc-shaped design at the end facing away from the support frame 4. The bottom rod 41 abuts against the ratchet 44. Two tension springs 43 are fixedly set between the swing rod 39 and the support frame 4. When the center rod 9 is pushed outward by the electric push rod 10, several annular grooves 11 on the side wall of the center rod 9 will pass through the position of the top rod 40 in sequence, thereby causing the top rod 40 to drive the swing rod 39 to swing. The bottom rod 41 set at the bottom of the swing rod 39 will drive the ratchet 44 and the positioning plate 13 to move towards the center frame 3. The tension springs 43 can bring the swing rod 39 back to the initial position after the swing rod 39 is rotated by the top rod 40.

[0038] The end of the positioning plate 13 facing the grinding section 2 does not exceed the position of the center frame 3. The height of the ratchet 44 at the top of the positioning plate 13 is less than the height of the bottom of the horizontal plate 6. The position of the positioning plate 13 is not flush with the center rod 9, nor with the center frame 3. The specific length can be adjusted by the staff according to the needs. In general, it is only necessary to ensure that when the positioning plate 13 contacts the interceptor plate 36, the center rod 9 has exceeded half of the seamless steel pipe that needs to be ground.

[0039] The working principle of this embodiment is as follows: First, the operator needs to adjust the position of the center frame 3. After rotating the position of the pull ring 14, the rotating rod 15, which is fixedly connected to the pull ring 14, will rotate accordingly, so that the limiting rod 24 on the side wall of the rotating rod 15 is disengaged from the magnetic connection of the arc groove 27, and then moves along the arc groove 27 into the vertical groove 26. The operator then pulls the pull ring 14 outward, so that the pull ring 14, together with the rotating rod 15 and the translation block 16, can move laterally, so that the side spring 28 is compressed. The movement of translation block 16 will cause ramp 22 to move synchronously, which in turn causes lifting wheel 17 to move along ramp 22. The plug 20, which was originally inserted into the plug hole 8, will rise under the action of bottom spring 19, making the position of the center seat movable. At this time, the staff can move the position of the center seat along the track 5. Then, the worker can place the seamless steel pipe on the central frame 3, and then activate the electric actuator 10 to drive the central rod 9 to move into the seamless steel pipe. Several annular grooves 11 on the side wall of the central rod 9 will pass through the position of the top rod 40 in sequence, which will cause the top rod 40 to drive the swing rod 39 to swing. The bottom rod 41 set at the bottom of the swing rod 39 will drive the ratchet 44 and the positioning plate 13 to move towards the central frame 3. The worker can observe whether the positioning plate 13 contacts the intercepting plate 36 to determine whether the central rod 9 has exceeded half the position of the seamless steel pipe, and thus confirm whether it has provided sufficient support for the seamless steel pipe.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A device for grinding the inner wall of a seamless steel pipe, comprising a honing machine, characterized in that, Also includes: The honing machine includes a machine base (1), a grinding section (2), a central frame (3), a support frame (4), a central support section, and two parallel tracks (5). The two tracks (5) are fixedly mounted on the machine base (1), the central frame (3) is slidably mounted on the tracks (5), and the support frame (4) and the central frame (3) are located between the central support section and the grinding section (2). A horizontal plate (6) is fixedly installed at the bottom of the central frame (3), and sliders (7) are fixedly installed on the bottom of both sides of the horizontal plate (6). The two sliders (7) are slidably connected to the two tracks (5). Several insertion holes (8) are opened on the side wall of the track (5). A fixing mechanism is provided between the horizontal plate (6) and the sliders (7). The central support includes a central rod (9) and an electric actuator (10). The output end of the electric actuator (10) is threadedly connected to the central rod (9). The central rod (9) passes through the support frame (4) and the central frame (3) in sequence. The side wall of the central rod (9) is provided with several annular grooves (11). A motion groove (12) is provided between the two tracks (5). A positioning plate (13) is slidably connected in the motion groove (12). The side wall of the support frame (4) is provided with a synchronization mechanism for driving the positioning plate (13). The fixing mechanism includes a pull ring (14), a rotating rod (15), a translation block (16), a lifting wheel (17), a top plate (18), a bottom spring (19), and a plug rod (20). The pull ring (14) is fixedly connected to the side wall of the rotating rod (15). A motion cavity is provided inside the horizontal plate (6). A through hole (21) is provided on the side wall of the motion cavity. The rotating rod (15) passes through the through hole (21). The end of the rotating rod (15) away from the pull ring (14) is rotatably connected to the side wall of the translation block (16). The translation block (16) is connected to the motion cavity. The sidewalls are slidably connected. The translation block (16) has ramps (22) at both ends. The slider (7) has a through hole (23) on its sidewall. The insertion rod (20) passes through the through hole (23) and is inserted into the insertion hole (8). The top plate (18) is fixedly set on the top of the insertion rod (20). The bottom spring (19) is wrapped around the outside of the insertion rod (20). One end of the bottom spring (19) is fixedly connected to the bottom of the top. The lifting wheel (17) is rotatably connected to the top of the top plate (18). The lifting wheel (17) abuts against the ramp (22). The rotating rod (15) is fixedly provided with a limiting rod (24) on its side wall. The bottom of the moving cavity is provided with an annular block (25). The inner wall of the annular block (25) is provided with a vertical groove (26). The end of the vertical groove (26) facing the pull ring (14) is open. The other end of the vertical groove (26) is connected to an arc groove (27). The limiting rod (24) is slidably connected to the inner wall of the arc groove (27). The end of the arc groove (27) away from the vertical groove (26) is magnetically connected to the limiting rod (24).

2. The seamless steel pipe inner wall grinding device according to claim 1, characterized in that, Two side springs (28) are fixedly installed on the side wall of the translation block (16), and the ends of the two side springs (28) away from the translation block (16) are fixedly connected to the side wall of the motion cavity.

3. The seamless steel pipe inner wall grinding device according to claim 1, characterized in that, The side wall of the motion cavity is rotatably connected to a threaded rod (29), and the threaded rod (29) is externally threaded to a displacement block (30). The two side walls of the displacement block (30) are respectively provided with transverse grooves (31), and a connecting rod (32) is slidably connected in the transverse groove (31). The other ends of the two connecting rods (32) are respectively fixedly connected to the side wall of the translation block (16). The other end of the threaded rod (29) is fixedly provided with a fixing rod (33). The side wall of the translation block (16) is provided with a fixing groove (34), and the fixing rod (33) is inserted into the fixing groove (34).

4. The seamless steel pipe inner wall grinding device according to claim 3, characterized in that, A back baffle (35) is fixedly installed on the side wall away from the pull ring (14) of the horizontal plate (6). An intercepting plate (36) is rotatably connected to the bottom of the horizontal plate (6). A motion hole (37) is opened at the bottom of the motion cavity. A diagonal rod (38) is rotatably connected to the bottom of the displacement block (30). The diagonal rod (38) passes through the motion hole (37) and is rotatably connected to the side wall of the intercepting plate (36).

5. The seamless steel pipe inner wall grinding device according to claim 1, characterized in that, The synchronization mechanism includes a swing rod (39), a top rod (40), a bottom rod (41), two support rods (42), and two tension springs (43). The two support rods (42) are fixedly mounted on the side wall of the support frame (4). The middle position of the swing rod (39) is rotatably connected to the side wall of the two support rods (42). The top rod (40) is fixedly mounted on the top of the swing rod (39). The top rod (40) abuts against one of the annular grooves (11). The bottom rod (41) is fixedly mounted on the bottom of the swing rod (39). The top of the positioning plate (13) is fixedly provided with several ratchet teeth (44). The end of the bottom rod (41) facing away from the support frame (4) is arc-shaped. The bottom rod (41) abuts against the ratchet teeth (44). The two tension springs (43) are fixedly mounted between the swing rod (39) and the support frame (4).

6. The seamless steel pipe inner wall grinding device according to claim 5, characterized in that, The support frame (4) has a clearance hole (45) at the bottom. The height of the clearance hole (45) is greater than the sum of the heights of the positioning plate (13) and the ratchet (44), and the width of the clearance hole (45) is greater than the width of the positioning plate (13).

7. The seamless steel pipe inner wall grinding device according to claim 1, characterized in that, The high point of the ramp (22) is located at one end of the translation block (16) near the pull ring (14), and the lifting wheel (17) abuts against the side wall of the high point of the ramp (22).

8. The seamless steel pipe inner wall grinding device according to claim 5, characterized in that, The positioning plate (13) faces the grinding part (2) at a position not exceeding the center frame (3), and the height of the ratchet (44) at the top of the positioning plate (13) is less than the height of the bottom of the horizontal plate (6).

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