An external wall grinding device for steel pipes

Abstract

The present invention relates to the field of steel pipe grinding, and discloses an outer wall grinding device for steel pipes, including a bottom plate. Driving structures are arranged at the front and rear sides on the upper surface of the bottom plate. A moving structure is arranged in the middle on the bottom plate. Support structures are arranged on the left and right sides on the upper surface of the bottom plate. Limiting structures are arranged near the two side corners at the front side on the upper surface of the bottom plate. When the driving structure drives the grinding structure on the moving structure to grind the steel pipe at the support structure, the positioning of the first support plate on the support structure by the positioning structure can be released, so that when the support structure moves down, the first support plate is separated from the steel pipe. The lifting structure is used to assist in supporting the position of the steel pipe to be ground, and the lifting structure moves synchronously with the grinding structure. In this way, it is very convenient to grind the outer wall of the steel pipe at the position of the first support plate, making the grinding of the outer wall of the steel pipe more thorough and the grinding efficiency higher.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe grinding, and in particular to an outer wall grinding device for steel pipes. Background Art

[0002] Steel with a hollow cross-section and a length much greater than the diameter or circumference; classified by cross-sectional shape into circular, square, rectangular, and special-shaped steel pipes; classified by material into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes, and composite steel pipes; classified by use into steel pipes for conveying pipelines, engineering structures, thermal equipment, petrochemical industries, machinery manufacturing, geological drilling, high-pressure equipment, etc. When grinding steel pipes, an outer wall grinding device is used;

[0003] A steel pipe outer wall grinding device with the patent number CN11381410A can perform all-round grinding on the surface of the steel pipe by setting a grinding mechanism, and a spring is provided. When the grinding disc comes into contact with the outer wall of the steel pipe for grinding, it can be buffered by the spring to avoid excessive grinding at a certain part. By using multiple grinding discs, the contact surface with the steel pipe surface is increased, making the grinding disc fit more completely with the steel pipe surface and improving the grinding effect;

[0004] In the existing grinding equipment, both ends of the steel pipe are supported by support members. When grinding a large-sized steel pipe, due to the large self-weight of the steel pipe, it is rather troublesome to move on the support members, resulting in time-consuming and laborious grinding work at the contact position between the steel pipe and the support members. Therefore, there are areas for improvement. Summary of the Invention

[0005] In order to solve the problems raised in the above background art, the present invention provides an outer wall grinding device for steel pipes.

[0006] The outer wall grinding device for steel pipes provided by the present invention adopts the following technical solutions:

[0007] An outer wall grinding device for steel pipes includes a bottom plate. Driving structures are arranged on the front and rear sides of the upper surface of the bottom plate, a moving structure is arranged in the middle of the bottom plate, and support structures are arranged on the left and right sides of the upper surface of the bottom plate;

[0008] The driving structure includes transverse grooves opened at the front and rear side edges of the upper surface of the bottom plate. A cross bar is connected between the left and right end walls of the transverse groove. A thread is provided on the front cross bar. A first motor is installed at the front side of the right surface of the bottom plate, and the first motor is connected to one end of the front cross bar. Moving plates are movably sleeved on both cross bars, and the moving plates are slidably arranged in the transverse grooves. A threaded groove for the corresponding cross bar to pass through is opened on the front moving plate;

[0009] The moving structure includes a first fixing frame installed on two moving plates. A fixing ring is fastened between the two first fixing frames by bolts. A grinding structure is arranged inside the fixing ring. Lifting structures are arranged on both the left and right sides of the fixing ring. A second driving structure is arranged on the fixing ring. A fixing plate is connected between the inner walls on both sides of the first fixing frame. Extrusion structures are arranged on both of the two fixing plates.

[0010] The supporting structure includes second fixing frames installed on the left and right sides of the upper surface of the bottom plate. First through grooves are respectively opened at the front sides of both sides of the second fixing frames. A vertical rod is connected to the middle of the lower groove wall of the first through groove. A through plate is movably inserted into the first through groove. A slot sleeving the vertical rod is opened at the bottom end of the through plate. A first spring is sleeved on the vertical rod. The two ends of the first spring are respectively connected to the through plate and the lower groove wall of the first through groove. A first supporting plate is welded to the top end of the through plate. A positioning structure is arranged on the second fixing frame.

[0011] Preferably, the positioning structure includes through grooves opened at the positions near the top ends of the inner walls on the front and rear sides of the second fixing frame. Positioning grooves are opened at the positions of the through plate near the through grooves. A positioning plate is movably inserted into the positioning groove. The positioning plate is in a "T" shape. Second springs are respectively connected to the upper and lower edges of one side inner wall of the positioning plate. One end of each second spring is connected to the second fixing frame. A fixing frame is connected to the middle of the mutually approaching side surfaces of each group of two positioning plates. A first pressure wheel is installed in the opening in the middle of the fixing frame. A second through groove is opened at the position of the through plate near the positioning groove. Second pressure wheels are installed at the lower parts of the two groove walls of the second through groove.

[0012] Preferably, the extrusion structure includes two longitudinal plates connected to the middle of the mutually approaching side surfaces of the two fixing plates. A first extrusion plate is connected to one end of the longitudinal plate. A second extrusion plate is fastened to the middle of the upper surface of the longitudinal plate by bolts. The end faces of both the first extrusion plate and the second extrusion plate are inclined surfaces.

[0013] Preferably, the lifting structure includes multiple connecting rods connected to the left and right end faces of the fixing ring. A second supporting plate is welded to the end of each group of connecting rods away from the fixing ring. Multiple supporting rods are equidistantly connected to the inner wall of the second supporting plate. A supporting cylinder is movably sleeved on each supporting rod. The second supporting plate is an arc-shaped plate.

[0014] Preferably, the grinding structure is rotatably installed in the inner sleeve at the middle of the inner wall of the fixed ring. A transmission structure is arranged between the inner sleeve and the bottom plate. A plurality of U-shaped seats are installed on the inner wall of the inner sleeve at equal angles in the circumferential direction. A rotating shaft passes through each U-shaped seat. A grinding wheel is fixedly sleeved on the middle of the rotating shaft. A third gear is fixedly sleeved on one end of the rotating shaft. A rotating ring is rotatably installed at one end of the inner wall of the fixed ring close to the third gear. The third gear is meshed with the teeth on the inner wall of the rotating ring. One end of the rotating ring is fixedly connected with a first toothed ring. An installation seat is installed at the middle above the fixed ring. A second motor is installed on the installation seat. A first gear is fixedly sleeved on one end of the output shaft of the second motor. The first gear is meshed with the teeth on the side of the first toothed ring.

[0015] Preferably, the transmission structure includes a groove opened at the middle of the outer side of the fixed ring. A second toothed ring is fixedly sleeved at the position of the groove on the side of the inner sleeve. Two installation blocks are connected to the rear side of the outer side of the fixed ring. A transmission rod passes through the installation blocks movably. A spiral groove is opened on the transmission rod. A rotating sleeve is movably sleeved between the two installation blocks on the transmission rod. Both ends of the rotating sleeve are respectively pressed against the two installation blocks. A second gear is fixedly sleeved on the middle of the rotating sleeve. The second gear is meshed with the teeth on the second toothed ring. A plug rod is fixedly inserted at one end of the rotating sleeve. One end of the plug rod slides in the spiral groove. First vertical plates are fixedly connected to both ends of the transmission rod. The bottom ends of the first vertical plates are connected to the bottom plate.

[0016] In summary, the present invention includes the following beneficial technical effects:

[0017] 1. By providing a support structure, a grinding structure, a positioning structure, a driving structure and a moving structure, when the driving structure drives the grinding structure on the moving structure to grind the steel pipe at the support structure, the positioning of the first support plate on the support structure by the positioning structure can be released, so that when the first support plate on the support structure moves down and separates from the steel pipe, the lifting structure is used to assist in supporting the position of the steel pipe to be ground, and the lifting structure moves synchronously with the grinding structure, which greatly facilitates the grinding of the outer wall of the steel pipe at the position of the first support plate, making the grinding of the outer wall of the steel pipe more thorough and the grinding efficiency higher;

[0018] 2. By providing an extrusion structure, when the grinding structure moves, it can automatically release the positioning of the first support plate on the support structure and automatically push the first support plate down to separate from the steel pipe for grinding, which saves time and effort in operation;

[0019] 3. The present invention is provided with a grinding structure and a transmission structure. By using multiple rotating grinding wheels on the grinding structure to closely adhere to the outer wall of the steel pipe for grinding, the contact area with the outer wall of the steel pipe is increased, the grinding work efficiency is improved, and along with the structure of the grinding structure, the inner sleeve and the whole grinding structure can be automatically driven to rotate through the transmission structure, so that the grinding structure can grind each position of the outer wall of the steel pipe, improving the quality of the grinding work. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of an outer wall grinding device for steel pipes in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the support structure in an embodiment of the present invention;

[0022] Figure 3 is in an embodiment of the present invention Figure 2 Enlarged view of the structure at position B;

[0023] Figure 4 is a schematic structural diagram of the moving structure and the grinding structure in an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of the grinding structure and the lifting structure in an embodiment of the present invention;

[0025] Figure 6 is in an embodiment of the present invention Figure 5 Enlarged view of the structure at position C;

[0026] Figure 7 is in an embodiment of the present invention Figure 5 Enlarged view of the structure at position D.

[0027] Description of the Reference Numerals: 1, bottom plate; 2, horizontal groove; 3, cross bar; 4, first motor; 5, moving plate; 6, first fixing frame; 7, fixing plate; 8, fixing ring; 9, second fixing frame; 10, through plate; 11, first through groove; 12, vertical rod; 13, first spring; 14, positioning groove; 15, through groove; 16, positioning plate; 17, fixing frame; 18, first pressing wheel; 19, second spring; 20, second through groove; 21, second pressing wheel; 22, longitudinal plate; 23, first pressing plate; 24, second pressing plate; 25, connecting rod; 26, support rod; 27, support cylinder; 28, second support plate; 29, inner sleeve; 30, U-shaped seat; 31, rotating shaft; 32, grinding wheel; 33, first toothed ring; 34, rotating ring; 35, mounting seat; 36, second motor; 37, first gear; 38, mounting block; 39, transmission rod; 40, rotating sleeve; 41, second gear; 42, groove; 43, second toothed ring; 44, first vertical plate; 45, inserting rod; 46, spiral groove; 47, third gear; 63, first support plate. Detailed implementation mode

[0028] The following will further elaborate on the present invention in conjunction with the attached Figures 1-7 drawings.

[0029] Referring to Figures 1-7 , an outer wall grinding device for steel pipes disclosed in an embodiment of the present invention includes a bottom plate 1. Driving structures are arranged at the front and rear sides on the upper surface of the bottom plate 1. A moving structure is arranged in the middle of the bottom plate 1. Support structures are arranged on the left and right sides on the upper surface of the bottom plate 1;

[0030] The driving structure includes transverse grooves 2 opened at the front and rear side edges on the upper surface of the bottom plate 1. A cross bar 3 is connected between the left and right end groove walls of the transverse groove 2. Threads are provided on the front cross bar 3. A first motor 4 is installed at the front side of the right surface of the bottom plate 1. The first motor 4 is connected to one end of the front cross bar 3. Moving plates 5 are movably sleeved on both cross bars 3. The moving plates 5 are slidably arranged in the transverse grooves 2. Threaded grooves for the corresponding cross bars 3 to pass through are opened on the front moving plate 5;

[0031] The moving structure includes first fixing frames 6 installed on the two moving plates 5. A fixing ring 8 is fastened between the two first fixing frames 6 by bolts. A grinding structure is arranged inside the fixing ring 8. Lifting structures are arranged on both the left and right sides of the fixing ring 8. A second driving structure is arranged on the fixing ring 8. Fixing plates 7 are connected between the inner walls on both sides of the first fixing frame 6. Pressing structures are arranged on both fixing plates 7;

[0032] The support structure includes second fixing frames 9 installed on the left and right sides on the upper surface of the bottom plate 1. First through grooves 11 are opened at the front sides of the upper sides of the second fixing frames 9. A vertical rod 12 is connected to the middle of the lower groove wall of the first through groove 11. A through plate 10 is movably inserted into the first through groove 11. A slot for sleeving on the vertical rod 12 is opened at the bottom end of the through plate 10. A first spring 13 is sleeved on the vertical rod 12. Both ends of the first spring 13 are respectively connected to the through plate 10 and the lower groove wall of the first through groove 11. A first support plate 63 is welded to the top end of the through plate 10. A positioning structure is arranged on the second fixing frame 9;

[0033] The positioning structure includes through grooves 15 opened at the positions near the top ends of the front and rear inner walls of the second fixing frame 9. Positioning grooves 14 are opened at the positions near the through grooves 15 on the through plate 10. Positioning plates 16 are movably inserted into the positioning grooves 14. The positioning plates 16 are in a "T" shape. Second springs 19 are connected to the upper and lower edges of the inner wall on one side of each positioning plate 16. One end of each second spring 19 is connected to the second fixing frame 9. Fixed frames 17 are connected to the middle of the mutually approaching side surfaces of each group of two positioning plates 16. A first pressure wheel 18 is installed in the middle opening of the fixed frame 17. Second through grooves 20 are opened at the positions near the positioning grooves 14 on the through plate 10. Second pressure wheels 21 are installed at the lower positions of the two groove walls of the second through groove 20;

[0034] The extrusion structure includes two longitudinal plates 22 connected to the middle of the mutually close sides of two fixed plates 7. One end of each longitudinal plate 22 is connected to a first extrusion plate 23. The middle of the upper surface of each longitudinal plate 22 is fastened with a second extrusion plate 24 by bolts. The end faces of both the first extrusion plate 23 and the second extrusion plate 24 are inclined surfaces.

[0035] The lifting structure includes multiple connecting rods 25 connected to the left and right end faces of the fixed ring 8. A second support plate 28 is welded to one end of each group of connecting rods 25 away from the fixed ring 8. Multiple support rods 26 are connected to the inner wall of the second support plate 28 at equal intervals. A support cylinder 27 is movably sleeved on each support rod 26. By rotating the support cylinder 27 on the support rod 26, when assisting in supporting the steel pipe, the static friction generated between the support cylinder and the steel pipe can be reduced, making the movement of the first fixing frame 6 smoother. The second support plate 28 is an arc-shaped plate. When starting the first motor 4 to drive the cross bar 3 provided with threads to rotate, the moving plate 5 drives the first fixing frame 6 and the grinding structure in the fixed ring 8 to move along the length direction of the bottom plate 1. When the first fixing frame 6 moves to a position close to one of the second fixing frames 9, as the first fixing frame 6 continues to move, it drives one end inclined surface of the first extrusion plate 23 to squeeze the first pressure wheel 18, pushing one end of the positioning plate 16 out of the positioning groove 14, and releasing the positioning of the through plate 10 on the second fixing frame 9. Then, the first fixing frame 6 drives one end inclined surface of the second extrusion plate 24 to squeeze the second pressure wheel 21, pushing the through plate 10 to move downward on the second fixing frame 9, thereby pulling the first support plate 63 at the top of the through plate 10 to move downward away from the steel pipe, exposing the contact position between the steel pipe and the first support plate 63. At this time, the support cylinders 27 on the second support plates 28 on both sides of the fixed ring 8 are used to assist in supporting one end of the steel pipe to prevent one end of the steel pipe from falling. In this way, as the first fixing frame 6 continues to move, it can drive the grinding structure to grind the contact position between the steel pipe and the first support plate 63, making the grinding of the steel pipe more thorough.

[0036] See Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7, the grinding structure is rotatably installed on the inner sleeve 29 at the middle of the inner wall of the fixed ring 8. A transmission structure is arranged between the inner sleeve 29 and the bottom plate 1. A plurality of U-shaped seats 30 are installed on the inner wall of the inner sleeve 29 at equal circumferential angles. A rotating shaft 31 is rotatably passed through each U-shaped seat 30. A grinding wheel 32 is fixedly sleeved in the middle of the rotating shaft 31. A third gear 47 is fixedly sleeved at one end of the rotating shaft 31. A rotating ring 34 is rotatably installed at one end of the inner wall of the fixed ring 8 close to the third gear 47. The third gear 47 is meshed with the teeth on the inner wall of the rotating ring 34. A first toothed ring 33 is fixedly connected to one end of the rotating ring 34. An installation seat 35 is installed at the middle above the fixed ring 8. A second motor 36 is installed on the installation seat 35. A first gear 37 is fixedly sleeved at one end of the output shaft of the second motor 36. The first gear 37 is meshed with the teeth on the side surface of the first toothed ring 33;

[0037] The transmission structure includes a groove 42 opened at the middle of the outer side surface of the fixed ring 8. A second toothed ring 43 is fixedly sleeved at the position of the side surface of the inner sleeve 29 in the groove 42. Two installation blocks 38 are connected to the rear side of the outer side surface of the fixed ring 8. A transmission rod 39 is movably passed through the installation blocks 38. A spiral groove 46 is opened on the transmission rod 39. A rotating sleeve 40 is movably sleeved between the two installation blocks 38 on the transmission rod 39. Both ends of the rotating sleeve 40 are respectively pressed against the two installation blocks 38. A second gear 41 is fixedly sleeved at the middle of the rotating sleeve 40. The second gear 41 is meshed with the teeth on the second toothed ring 43. A plug rod 45 is fixedly inserted at one end of the rotating sleeve 40. One end of the plug rod 45 is slidably arranged in the spiral groove 46. First vertical plates 44 are fixedly connected to both ends of the transmission rod 39. The bottom ends of the first vertical plates 44 are connected to the bottom plate 1. When the first fixing frame 6 moves, the second motor 36 on the installation seat 35 is started to drive the first gear 37 to rotate. The rotating ring 34 is driven to rotate through the first toothed ring 33. The grinding wheel 32 on the U-shaped seat 30 is driven to rotate by the action of the teeth on the rotating ring 34 on the third gear 47. At the same time, the first fixing frame 6 drives one end of the plug rod 45 to slide in the spiral groove 46 on the transmission rod 39, thereby driving the whole rotating sleeve 40 and the second gear 41 to rotate. Since the second gear 41 is meshed with the teeth on the second toothed ring 43, the inner sleeve 29 can be driven to rotate on the fixed ring 8. In this way, the grinding wheel 32 that rotates by itself is pressed against the outer wall of the steel pipe and rotates for grinding, which not only grinds the outer wall of the steel pipe more thoroughly, but also improves the grinding work efficiency.

[0038] The implementation principle of an outer wall grinding device for steel pipes in an embodiment of the present invention is as follows: First, the steel pipe to be ground is supported on two first support plates 63. Then, the first motor 4 and the second motor 36 are started. When the first motor 4 drives the cross bar 3 provided with threads to rotate, the moving plate 5 drives the first fixing frame 6 and the grinding structure within the fixing ring 8 to move along the length direction of the bottom plate 1. When the first fixing frame 6 moves to a position close to one of the second fixing frames 9, with the continuous movement of the first fixing frame 6, one end of the first pressing plate 23 is pressed against the first pressure wheel 18 by the inclined surface, pushing one end of the positioning plate 16 out of the positioning groove 14, and releasing the positioning of the through plate 10 on the second fixing frame 9. Then, one end of the second pressing plate 24 of the first fixing frame 6 is pressed against the second pressure wheel 21, pushing the through plate 10 to move downward on the second fixing frame 9, thereby pulling the first support plate 63 at the top of the through plate 10 to move downward and separate from the steel pipe, exposing the contact position between the steel pipe and the first support plate 63. At this time, the support cylinders 27 on the second support plates 28 on both sides of the fixing ring 8 are used to assist in supporting one end of the steel pipe to prevent one end of the steel pipe from falling. And during the movement of the first fixing frame 6, the second motor 36 drives the first gear 37 to rotate, drives the rotating ring 34 to rotate through the first toothed ring 33, and uses the teeth on the rotating ring 34 to act on the third gear 47 to drive the grinding wheel 32 on the U-shaped seat 30 to rotate. At the same time, one end of the insertion rod 45 of the first fixing frame 6 slides in the spiral groove 46 on the transmission rod 39, thereby driving the overall rotation of the rotating sleeve 40 and the second gear 41. Since the second gear 41 is meshed with the teeth on the second toothed ring 43, it can drive the inner sleeve 29 to rotate on the fixing ring 8. In this way, the grinding wheel 32 that rotates by itself is closely attached to the outer wall of the steel pipe and rotates for grinding, not only grinding the outer wall of the steel pipe more thoroughly, but also improving the grinding work efficiency. When the outer wall of one end of the steel pipe is ground, the first fixing frame 6 drives the grinding wheel 32 to move in the reverse direction to grind the remaining part of the steel pipe. When the first fixing frame 6 drives the second pressing plate 24 to be withdrawn from the second pressure wheel 21, the elastic force of the first spring 13 is used to push the first support plate 63 upward to be closely attached to the steel pipe. When one end of the first pressing plate 23 is withdrawn from the first pressure wheel 18, the elastic force of the second spring 19 is used to pull one end of the positioning plate 16 to insert into the positioning groove 14 on the through plate 10, repositioning the first support plate 63 on the second fixing frame 9. The first support plate 63 can support one end of the steel pipe again, enabling the grinding wheel 32 to continue grinding the other end of the steel pipe. In this way, the grinding work of the steel pipe can be realized.

[0039] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An external wall grinding device for steel pipes, comprising a bottom plate (1), characterized in that: A driving structure is arranged on the front and rear sides of the upper surface of the bottom plate (1), a moving structure is arranged in the middle of the bottom plate (1), and supporting structures are arranged on the left and right sides of the upper surface of the bottom plate (1); The driving structure includes transverse grooves (2) opened at the edges of the front and rear sides of the upper surface of the bottom plate (1). A cross bar (3) is connected between the left and right end walls of the transverse groove (2). A thread is provided on the front cross bar (3). A first motor (4) is installed at the front side of the right surface of the bottom plate (1), and the first motor (4) is connected to one end of the front cross bar (3). Moving plates (5) are movably sleeved on both cross bars (3), and the moving plates (5) are slidably arranged in the transverse grooves (2). A threaded groove for the corresponding cross bar (3) to pass through is opened on the front moving plate (5); The moving structure includes a first fixing frame (6) installed on two moving plates (5). A fixing ring (8) is fastened between the two first fixing frames (6) by bolts. A grinding structure is arranged inside the fixing ring (8). Lifting structures are arranged on both the left and right sides of the fixing ring (8). A second driving structure is arranged on the fixing ring (8). A fixing plate (7) is connected between the inner walls on both sides of the first fixing frame (6). Extrusion structures are arranged on both fixing plates (7); The supporting structure includes second fixing frames (9) installed on the left and right sides of the upper surface of the bottom plate (1). First through grooves (11) are opened at the front sides of the upper sides of the second fixing frames (9). A vertical rod (12) is connected to the middle of the lower wall of the first through groove (11). A through plate (10) is movably inserted into the first through groove (11). A slot for sleeving on the vertical rod (12) is opened at the bottom end of the through plate (10). A first spring (13) is sleeved on the vertical rod (12), and both ends of the first spring (13) are respectively connected to the through plate (10) and the lower wall of the first through groove (11). The top end of the through plate (10) is welded with a first support plate (63). A positioning structure is arranged on the second fixing frame (9); The positioning structure includes through grooves (15) opened at the positions near the top ends of the inner walls on the front and rear sides of the second fixing frame (9). A positioning groove (14) is opened on the through plate (10) near the through groove (15). A positioning plate (16) is movably inserted into the positioning groove (14). The positioning plate (16) is in a "T" shape. Second springs (19) are connected to the edges of the upper and lower sides of one inner wall of the positioning plate (16), and one end of each second spring (19) is connected to the second fixing frame (9). A fixing frame (17) is connected to the middle of the mutually approaching side surfaces of each group of two positioning plates (16). A first pressure wheel (18) is installed in the opening in the middle of the fixing frame (17). A second through groove (20) is opened on the through plate (10) near the positioning groove (14). Second pressure wheels (21) are installed at the lower sides of the two side walls of the second through groove (20); The extrusion structure includes two longitudinal plates (22) connected to the middle of the mutually adjacent sides of two fixing plates (7). One end of each longitudinal plate (22) is connected to a first extrusion plate (23). A second extrusion plate (24) is fastened to the middle of the upper surface of each longitudinal plate (22) by bolts. Both end faces of the first extrusion plate (23) and the second extrusion plate (24) are inclined surfaces.

2. The outer wall grinding device for steel pipes according to claim 1, characterized in that: The lifting structure includes a plurality of connecting rods (25) connected to the left and right end faces of a fixing ring (8). A second support plate (28) is welded to one end of each group of connecting rods (25) away from the fixing ring (8). A plurality of support rods (26) are connected to the inner wall of the second support plate (28) at equal intervals. A support cylinder (27) is movably sleeved on each support rod (26). The second support plate (28) is an arc-shaped plate.

3. The outer wall grinding device for steel pipes according to claim 1, characterized in that: The grinding structure is rotationally installed with an inner sleeve (29) at the middle of the inner wall of the fixing ring (8). A transmission structure is arranged between the inner sleeve (29) and the bottom plate (1). A plurality of U-shaped seats (30) are installed on the inner wall of the inner sleeve (29) at equal angles in the circumferential direction. A rotating shaft (31) is rotatably passed through each U-shaped seat (30). A grinding wheel (32) is fixedly sleeved on the middle of the rotating shaft (31). A third gear (47) is fixedly sleeved on one end of the rotating shaft (31). A rotating ring (34) is rotationally installed at one end of the inner wall of the fixing ring (8) close to the third gear (47). The third gear (47) is meshed and connected with the teeth on the inner wall of the rotating ring (34). One end of the rotating ring (34) is fixedly connected to a first toothed ring (33). An installation seat (35) is installed at the middle above the fixing ring (8). A second motor (36) is installed on the installation seat (35). A first gear (37) is fixedly sleeved on one end of the output shaft of the second motor (36). The first gear (37) is meshed and connected with the teeth on the side surface of the first toothed ring (33).

4. A kind of outer wall grinding equipment for steel pipes according to claim 3, characterized in that: The transmission structure includes a groove (42) opened at the middle of the outer side surface of the fixing ring (8). A second toothed ring (43) is fixedly sleeved at the position of the side surface of the inner sleeve (29) corresponding to the groove (42). Two installation blocks (38) are connected to the rear side of the outer side surface of the fixing ring (8). A transmission rod (39) is movably passed through the installation blocks (38). A spiral groove (46) is opened on the transmission rod (39). A rotating sleeve (40) is movably sleeved between the two installation blocks (38) on the transmission rod (39). Both ends of the rotating sleeve (40) are respectively pressed against the two installation blocks (38). A second gear (41) is fixedly sleeved on the middle of the rotating sleeve (40). The second gear (41) is meshed and connected with the teeth on the second toothed ring (43). One end of an insertion rod (45) is fixedly inserted into the rotating sleeve (40). One end of the insertion rod (45) is slidably arranged in the spiral groove (46). First vertical plates (44) are fixedly connected to both ends of the transmission rod (39). The bottom ends of the first vertical plates (44) are connected to the bottom plate (1).

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