Outer wall grinding equipment for steel pipe

Abstract

The invention relates to the field of steel pipe grinding, and discloses steel pipe outer wall grinding equipment which comprises a bottom plate, driving structures are arranged on the front side and the rear side of the upper surface of the bottom plate, a moving structure is arranged in the middle of the bottom plate, and supporting structures are arranged on the left side and the right side of the upper surface of the bottom plate. Limiting structures are arranged at the positions, close to the corners of the two sides, of the front side of the upper face of the bottom plate, and when the driving structure drives the grinding structure on the moving structure to grind the steel pipe on the supporting structure, positioning of the positioning structure on the first supporting plate on the supporting structure can be relieved, so that the first supporting plate is separated from the steel pipe when the supporting structure moves downwards; and the lifting structure is matched to conduct auxiliary supporting on the to-be-ground position of the steel pipe, the lifting structure moves synchronously with the grinding structure, in this way, the position, located on the first supporting plate, of the outer wall of the steel pipe is ground conveniently, the outer wall of the steel pipe is ground more thoroughly, and the grinding efficiency is higher.

Description

Technical Field

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

[0002] Steel with a hollow section whose length is much larger than its diameter or circumference; divided into round, square, rectangular and special-shaped steel pipes according to the cross-sectional shape; divided into carbon structural steel pipes, low alloy structural steel pipes, alloy steel pipes and composite steel pipes according to the material; divided into steel pipes for pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc. according to the purpose. When grinding steel pipes, outer wall grinding equipment is used; Patent number CN11381410A is a steel pipe outer wall grinding device. By setting a grinding mechanism, the surface of the steel pipe can be fully ground. A spring is set. When the grinding sheet contacts the outer wall of the steel pipe for grinding, the spring can be used for buffering to avoid excessive grinding of a certain part. Multiple grinding sheets are used to increase the contact area with the steel pipe surface, so that the grinding sheet and the steel pipe surface fit more completely, thereby improving the grinding effect. In the prior art, grinding equipment supports both ends of the steel pipe by support members. When grinding a large-sized steel pipe, it is troublesome to move the steel pipe on the support member due to its own heavy weight, which makes the grinding work at the contact position between the steel pipe and the support member time-consuming and laborious. Therefore, there is room for improvement. Summary of the invention

[0003] In order to solve the problems raised in the above background technology, the present invention provides an outer wall grinding device for a steel pipe.

[0004] The present invention provides an outer wall grinding device for a steel pipe, which adopts the following technical solution: An outer wall grinding device for a steel pipe comprises a bottom plate, a driving structure is arranged at the front and rear sides of the bottom plate, a moving structure is arranged at the middle of the bottom plate, and a supporting structure is arranged at the left and right sides of the bottom plate; The driving structure includes a transverse groove opened at the front and rear edges of the bottom plate, a transverse rod is connected between the groove walls at the left and right ends of the transverse groove, a thread is arranged on the front transverse rod, a first motor is installed at the front side of the right side of the bottom plate, the first motor is connected to one end of the front transverse rod, a movable plate is movably sleeved on the two transverse rods, the movable plate is slidably arranged in the transverse groove, and a threaded groove for the corresponding transverse rod to pass through is opened on the front movable plate; The mobile structure includes a first fixed frame installed on two mobile plates, a fixed ring is fastened between the two first fixed frames by bolts, a grinding structure is arranged inside the fixed ring, a lifting structure is arranged on both sides of the fixed ring, a second driving structure is arranged on the fixed ring, a fixed plate is connected between the inner walls on both sides of the first fixed frame, and an extrusion structure is arranged on both fixed plates; The supporting structure includes a second fixing frame installed on the left and right sides of the bottom plate, a first through slot is opened on both sides of the front side of the second fixing frame, a vertical rod is connected to the middle of the lower slot wall of the first through slot, a through plate is movably inserted into the first through slot, a slot is opened at the bottom end of the through plate and sleeved on the vertical rod, a first spring is sleeved on the vertical rod, two ends of the first spring are respectively connected to the through plate and the lower slot wall of the first through slot, a first supporting plate is welded to the top of the through plate, and a positioning structure is arranged on the second fixing frame.

[0005] Preferably, the positioning structure includes a through groove opened at the inner walls on both sides of the front and rear of the second fixing frame near the top, a positioning groove is opened on the through plate near the through groove, a positioning plate is movably inserted into the positioning groove, the positioning plate is in a "T" shape, and second springs are connected to the upper and lower edges of the inner wall on one side of the positioning plate, one end of the second spring is connected to the second fixing frame, each group of two positioning plates is connected to a fixing frame at the middle of one side close to each other, a first pressure wheel is installed in the opening in the middle of the fixing frame, a second through groove is opened on the through plate near the positioning groove, and second pressure wheels are installed below the groove walls on both sides of the second through groove.

[0006] Preferably, the extrusion structure includes two longitudinal plates connected to the middle of one side of two fixed plates close to each other, one end of the longitudinal plate is connected to the first extrusion plate, and the middle of the upper surface of the longitudinal plate is fastened with a second extrusion plate by bolts, and both end surfaces of the first extrusion plate and the second extrusion plate are inclined surfaces.

[0007] Preferably, the lifting structure includes a plurality of connecting rods connected to the left and right end faces of the fixed ring, a second support plate is welded to the end of each group of connecting rods away from the fixed ring, a plurality of support rods are connected to the inner wall of the second support plate at equal intervals, a support tube is movably sleeved on each of the support rods, and the second support plate is an arc-shaped plate.

[0008] Preferably, the grinding structure is rotatably mounted on an inner sleeve in 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 circumferentially mounted at equal angles on the inner wall of the inner sleeve, a rotating shaft is rotatably passed through each of the U-shaped seats, a grinding wheel is fixedly mounted in the middle of the rotating shaft, a third gear is fixedly mounted on one end of the rotating shaft, a swivel is rotatably mounted on the inner wall of the fixed ring near one end of the third gear, the third gear is meshingly connected with teeth on the inner wall of the swivel, one end of the swivel is fixedly connected with a first gear ring, a mounting seat is installed in the middle above the fixed ring, a second motor is mounted on the mounting seat, a first gear is fixedly mounted on one end of the output shaft of the second motor, and the first gear is meshingly connected with teeth on the side surface of the first gear ring.

[0009] Preferably, the transmission structure includes a groove opened in the middle of the outer side surface of the fixed ring, the second gear ring is fixedly mounted on the side surface of the inner sleeve in the groove, two mounting blocks are connected at the rear side of the outer side surface of the fixed ring, a transmission rod is movably passed through the mounting block, a spiral groove is opened on the transmission rod, a rotating sleeve is movably mounted on the transmission rod between the two mounting blocks, two ends of the rotating sleeve are respectively tightly attached to the two mounting blocks, a second gear is fixedly mounted in the middle of the rotating sleeve, the second gear is meshingly connected with teeth on the second gear ring, an insertion rod is fixedly inserted into one end of the rotating sleeve, one end of the insertion rod is slidably set in the spiral groove, both ends of the transmission rod are fixedly connected with a first vertical plate, and the bottom end of the first vertical plate is connected to the bottom plate.

[0010] In summary, the present invention includes the following beneficial technical effects: 1. The present invention is provided with a supporting structure, a grinding structure, a positioning structure, a driving structure and a moving structure, so that when the driving structure drives the grinding structure on the moving structure to grind the steel pipe at the supporting structure, the positioning structure can release the positioning of the first supporting plate on the supporting structure, so that the first supporting plate and the steel pipe are disengaged when the supporting structure moves down, and the lifting structure is cooperated to provide auxiliary support for the position of the steel pipe to be polished, and the lifting structure moves synchronously with the grinding structure, so that the outer wall of the steel pipe is conveniently polished at the position of the first supporting plate, so that the outer wall of the steel pipe is polished more thoroughly and the polishing efficiency is higher; 2. The present invention is provided with an extrusion structure, so that 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 downward to separate from the steel pipe for grinding, which saves time and effort; 3. The present invention is provided with a grinding structure and a transmission structure, and utilizes multiple rotating grinding wheels on the grinding structure to grind closely against the outer wall of the steel pipe, thereby increasing the contact area with the outer wall of the steel pipe and improving the grinding efficiency. In addition, along with the structure of the grinding structure, the transmission structure can also automatically drive the inner sleeve and the grinding structure as a whole to rotate, so that the grinding structure can grind various positions of the outer wall of the steel pipe, thereby improving the quality of the grinding work. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an outer wall grinding device for a steel pipe according to an embodiment of the present invention; Figure 2 is a structural schematic diagram of a support structure in an embodiment of the present invention; Figure 3 In the embodiment of the present invention Figure 2 A magnified view of the structure at B; Figure 4 is a schematic structural diagram of a moving structure and a grinding structure in an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a grinding structure and a lifting structure in an embodiment of the present invention; Figure 6 In the embodiment of the present invention Figure 5 A magnified view of the structure at C; Figure 7 In the embodiment of the present invention Figure 5 Enlarged view of the structure at D.

[0012] Explanation of the reference numerals: 1, bottom plate; 2, transverse groove; 3, transverse rod; 4, first motor; 5, movable plate; 6, first fixed frame; 7, fixed plate; 8, fixed ring; 9, second fixed frame; 10, through plate; 11, first through groove; 12, vertical rod; 13, first spring; 14, positioning groove; 15, through groove; 16, positioning plate; 17, fixed frame; 18, first pressure wheel; 19, second spring; 20, second through groove; 21, second pressure wheel; 22, longitudinal plate; 23, first extrusion plate; 24, second Extrusion plate; 25, connecting rod; 26, support rod; 27, support tube; 28, second support plate; 29, inner sleeve; 30, U-shaped seat; 31, rotating shaft; 32, grinding wheel; 33, first gear 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 gear ring; 44, first vertical plate; 45, plug rod; 46, spiral groove; 47, third gear; 63, first support plate. DETAILED DESCRIPTION

[0013] The following is combined with Figure 1-Figure 7 The present invention is described in further detail.

[0014] Reference Figure 1-Figure 7 The embodiment of the present invention discloses an outer wall grinding device for a steel pipe, comprising a bottom plate 1, a driving structure is arranged at the front and rear sides of the bottom plate 1, a moving structure is arranged at the middle of the bottom plate 1, and a supporting structure is arranged at the left and right sides of the bottom plate 1; The driving structure includes a transverse groove 2 opened at the front and rear edges of the bottom plate 1, a transverse rod 3 is connected between the groove walls at the left and right ends of the transverse groove 2, and a thread is arranged on the front transverse rod 3. A first motor 4 is installed at the front side of the right side of the bottom plate 1, and the first motor 4 is connected to one end of the front transverse rod 3. A movable plate 5 is movably sleeved on the two transverse rods 3, and the movable plate 5 is slidably arranged in the transverse groove 2. A threaded groove for the corresponding transverse rod 3 to pass through is opened on the front transverse plate 5; The mobile structure includes a first fixed frame 6 installed on two mobile plates 5, a fixed ring 8 is fastened between the two first fixed frames 6 by bolts, a grinding structure is arranged inside the fixed ring 8, a lifting structure is arranged on both sides of the fixed ring 8, a second driving structure is arranged on the fixed ring 8, a fixed plate 7 is connected between the inner walls on both sides of the first fixed frame 6, and an extrusion structure is arranged on the two fixed plates 7; The supporting structure includes a second fixing frame 9 installed on the left and right sides of the bottom plate 1, and first through slots 11 are provided on both sides of the front side of the second fixing frame 9. A vertical rod 12 is connected to the middle of the lower groove wall of the first through slot 11. A through plate 10 is movably inserted into the first through slot 11. A slot sleeved on the vertical rod 12 is provided at the bottom end of the through plate 10. A first spring 13 is sleeved on the vertical rod 12. The two ends of the first spring 13 are respectively connected to the through plate 10 and the lower groove wall of the first through slot 11. A first supporting plate 63 is welded to the top of the through plate 10. A positioning structure is provided on the second fixing frame 9; The positioning structure includes a through groove 15 provided at the inner wall of the front and rear sides of the second fixing frame 9 near the top, a positioning groove 14 is provided on the through plate 10 near the through groove 15, a positioning plate 16 is movably inserted into the positioning groove 14, and the positioning plate 16 is in a "T" shape. The upper and lower edges of the inner wall on one side of the positioning plate 16 are connected to the second spring 19, and one end of the second spring 19 is connected to the second fixing frame 9. Each group of two positioning plates 16 is connected to a fixing frame 17 at the middle of one side close to each other, and a first pressure wheel 18 is installed in the opening in the middle of the fixing frame 17. A second through groove 20 is provided on the through plate 10 near the positioning groove 14, and second pressure wheels 21 are installed below the groove walls on both sides of the second through groove 20; The extrusion structure includes two longitudinal plates 22 connected to the middle of one side of the two fixing plates 7, one end of the longitudinal plate 22 is connected to the first extrusion plate 23, and the middle of the upper part of the longitudinal plate 22 is fastened with a second extrusion plate 24 by bolts, and both end surfaces of the first extrusion plate 23 and the second extrusion plate 24 are inclined surfaces; The lifting structure includes a plurality of connecting rods 25 connected to the left and right end surfaces of the fixing ring 8, and a second supporting plate 28 is welded to the end of each group of connecting rods 25 away from the fixing ring 8. A plurality of supporting rods 26 are connected to the inner wall of the second supporting plate 28 at equal intervals, and a supporting tube 27 is movably sleeved on each supporting rod 26. The rotation of the supporting tube 27 on the supporting rod 26 can reduce the static friction between the supporting tube and the steel pipe when assisting in supporting the steel pipe, so that the first fixing frame 6 can move more smoothly. The second supporting plate 28 is an arc-shaped plate. When the first motor 4 is started to drive the cross bar 3 with the threaded thread to rotate, the moving plate 5 drives the first fixing frame 6 and the grinding structure in 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, as the first fixing frame 6 continues to move, it drives One end of the first extrusion plate 23 is tilted to face the first pressure wheel 18 for extrusion, pushing one end of the positioning plate 16 out of the positioning groove 14, releasing the positioning of the penetration plate 10 on the second fixing frame 9, and then the first fixing frame 6 drives one end of the second extrusion plate 24 to face the second pressure wheel 21 for extrusion, pushing the penetration plate 10 to move downward on the second fixing frame 9, thereby pulling the first support plate 63 at the top of the penetration plate 10 to move downward and away from the steel pipe, exposing the contact position between the steel pipe and the first support plate 63. At this time, the support cylinder 27 on the second support plate 28 on both sides of the fixing ring 8 is used to auxiliary support 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, the grinding structure can be driven to grind the contact position between the steel pipe and the first support plate 63, so that the steel pipe can be polished more thoroughly.

[0015] See also Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the grinding structure is rotatably mounted on the inner sleeve 29 in 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 arranged at equal angles on the inner wall of the inner sleeve 29, 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 on one end of the rotating shaft 31, a rotating ring 34 is rotatably mounted on the inner wall of the fixed ring 8 near one end of the third gear 47, the third gear 47 is meshed with the teeth on the inner wall of the rotating ring 34, one end of the rotating ring 34 is fixedly connected to the first gear ring 33, a mounting seat 35 is arranged in the middle above the fixed ring 8, a second motor 36 is arranged on the mounting 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 with the side teeth of the first gear ring 33; The transmission structure includes a groove 42 provided in the middle of the outer side of the fixed ring 8, a second gear ring 43 is fixedly sleeved on the side of the inner sleeve 29 at the groove 42, two mounting blocks 38 are connected at the rear side of the outer side of the fixed ring 8, a transmission rod 39 is movably passed through the mounting block 38, a spiral groove 46 is provided on the transmission rod 39, a rotating sleeve 40 is movably sleeved between the two mounting blocks 38 on the transmission rod 39, and the two ends of the rotating sleeve 40 are respectively pressed against the two mounting blocks 38, a second gear 41 is fixedly sleeved in the middle of the rotating sleeve 40, and the second gear 41 is meshed with the teeth on the second gear ring 43, an insertion rod 45 is fixedly inserted into one end of the rotating sleeve 40, and one end of the insertion rod 45 is slidably set in the spiral groove 46, and both ends of the transmission rod 39 are fixedly connected with a first vertical plate 44, and the bottom of the first vertical plate 44 The first end is connected to the base plate 1. When the first fixed frame 6 moves, the second motor 36 on the mounting seat 35 is started to drive the first gear 37 to rotate, and the rotating ring 34 is driven to rotate through the first gear ring 33. The effect of the teeth on the rotating ring 34 on the third gear 47 is used to drive the grinding wheel 32 on the U-shaped seat 30 to rotate. At the same time, the first fixed frame 6 drives one end of the insertion rod 45 to slide in the spiral groove 46 on the transmission rod 39, thereby driving the rotating sleeve 40 and the second gear 41 to rotate as a whole. Since the second gear 41 is meshed with the teeth on the second gear 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 close to the outer wall of the steel pipe for rotation and grinding, which not only grinds the outer wall of the steel pipe more thoroughly, but also improves the grinding work efficiency.

[0016] The implementation principle of the outer wall grinding device for steel pipes according to the 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, and when the first motor 4 drives the cross bar 3 with threads to rotate, the movable plate 5 drives the first fixed frame 6 and the grinding structure in the fixed ring 8 to move along the length direction of the bottom plate 1, and when the first fixed frame 6 moves to a position close to one of the second fixed frames 9, as the first fixed frame 6 continues to move, it drives one end of the first extrusion plate 23 to tilt and face the first pressure wheel 18 for extrusion, and pushes one end of the positioning plate 16 to be pulled out of the positioning groove 14, and then the first extrusion plate 23 is moved to the second pressure wheel 18. The positioning of the penetration plate 10 on the fixing frame 9 is released, and then the first fixing frame 6 drives one end of the second extrusion plate 24 to tilt and face the second pressure wheel 21 for extrusion, pushing the penetration plate 10 to move downward on the second fixing frame 9, thereby pulling the first support plate 63 at the top of the penetration 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 auxiliary support one end of the steel pipe to prevent one end of the steel pipe from falling. In the process of moving the first fixing frame 6, the second motor 36 drives the first gear 37 to rotate, and drives the rotating ring 34 to rotate through the first gear ring 33. The grinding wheel 32 on the U-shaped seat 30 is driven to rotate by utilizing the effect of the teeth on the rotating ring 34 on the third gear 47. At the same time, the first fixed 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 rotating sleeve 40 and the second gear 41 to rotate as a whole. Since the second gear 41 is meshed with the teeth on the second gear 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 rotated and polished against the outer wall of the steel pipe, which not only polishes the outer wall of the steel pipe more thoroughly, but also improves the grinding work efficiency. After the outer wall of one end of the steel pipe is polished, the first fixed frame 6 drives the grinding wheel 32 moves in the opposite direction to grind the remaining part of the steel pipe. When the first fixing frame 6 drives the second extrusion plate 24 to be pulled out from the second pressure wheel 21, the elastic force of the first spring 13 is used to push the first support plate 63 to move up and close to the steel pipe. When one end of the first extrusion plate 23 is pulled out 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 into the positioning groove 14 on the through plate 10, and the first support plate 63 is repositioned on the second fixing frame 9. The first support plate 63 can support one end of the steel pipe again, so that the grinding wheel 32 can continue to grind the other end of the steel pipe, thereby realizing the grinding of the steel pipe.

[0017] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An apparatus for grinding the outer wall of a steel pipe, comprising a bottom plate (1), characterized in that: A driving structure is arranged on the front and rear sides of the bottom plate (1), a moving structure is arranged in the middle of the bottom plate (1), and a supporting structure is arranged on the left and right sides of the bottom plate (1); The driving structure comprises a transverse groove (2) formed at the front and rear edges of the bottom plate (1); a transverse rod (3) is connected between the groove walls at the left and right ends of the transverse groove (2); a thread is provided on the front transverse rod (3); a first motor (4) is installed at the front side of the right side of the bottom plate (1); the first motor (4) is connected to one end of the front transverse rod (3); a movable plate (5) is movably sleeved on the two transverse rods (3); the movable plate (5) is slidably arranged in the transverse groove (2); and a thread groove is provided on the front transverse rod (5) for the corresponding transverse rod (3) to pass through; The mobile structure comprises a first fixed frame (6) mounted on two mobile plates (5), a fixed ring (8) is fastened between the two first fixed frames (6) by bolts, a grinding structure is arranged inside the fixed ring (8), a lifting structure is arranged on both sides of the fixed ring (8), a second driving structure is arranged on the fixed ring (8), a fixed plate (7) is connected between the inner walls on both sides of the first fixed frame (6), and an extrusion structure is arranged on both fixed plates (7); The support structure comprises a second fixing frame (9) installed on the left and right sides of the bottom plate (1), the second fixing frame (9) is provided with a first through slot (11) on both sides of the front side, the middle of the lower slot wall of the first through slot (11) is connected to a vertical rod (12), a through plate (10) is movably inserted into the first through slot (11), a slot sleeved on the vertical rod (12) is provided at the bottom end of the through plate (10), a first spring (13) is sleeved on the vertical rod (12), two ends of the first spring (13) are respectively connected to the through plate (10) and the lower slot wall of the first through slot (11), a first supporting plate (63) is welded to the top end of the through plate (10), and a positioning structure is provided on the second fixing frame (9).

2. The outer wall grinding device for steel pipe according to claim 1, characterized in that: The positioning structure comprises a through groove (15) formed on the inner walls of the front and rear sides of the second fixing frame (9) near the top end, a positioning groove (14) formed on the through plate (10) near the through groove (15), a positioning plate (16) movably inserted into the positioning groove (14), the positioning plate (16) being in a "T" shape, second springs (19) being connected to the upper and lower edges of the inner wall on one side of the positioning plate (16), one end of the second spring (19) being connected to the second fixing frame (9), a fixing frame (17) being connected to the middle of one side of each group of two positioning plates (16) near each other, a first pressure wheel (18) being installed in the opening in the middle of the fixing frame (17), a second through groove (20) being formed on the through plate (10) near the positioning groove (14), and second pressure wheels (21) being installed below the groove walls on both sides of the second through groove (20).

3. The outer wall grinding device for steel pipe according to claim 1, characterized in that: The extrusion structure comprises two longitudinal plates (22) connected to the middle of one side surface of two fixed plates (7) close to each other, one end of the 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 the longitudinal plate (22) by bolts, and both end surfaces of the first extrusion plate (23) and the second extrusion plate (24) are inclined surfaces.

4. The outer wall grinding device for steel pipe according to claim 1, characterized in that: The lifting structure comprises a plurality of connecting rods (25) connected to the left and right end surfaces of the fixing ring (8); a second support plate (28) is welded to the 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 tube (27) is movably sleeved on each of the support rods (26); and the second support plate (28) is an arc-shaped plate.

5. The outer wall grinding device for steel pipe according to claim 1, characterized in that: The grinding structure is rotatably mounted on an inner sleeve (29) in 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 circumferentially mounted at equal angles on the inner wall of the inner sleeve (29); a rotating shaft (31) is rotatably passed through each of the U-shaped seats (30); a grinding wheel (32) is fixedly sleeved in the middle of the rotating shaft (31); a third gear (47) is fixedly sleeved on one end of the rotating shaft (31); and the inner wall of the fixed ring (8) is close to the third gear. A rotating ring (34) is rotatably mounted at one end of the rotating ring (47), the third gear (47) is meshedly connected with the teeth on the inner wall of the rotating ring (34), one end of the rotating ring (34) is fixedly connected with the first gear ring (33), a mounting seat (35) is mounted in the middle of the upper part of the fixing ring (8), a second motor (36) is mounted on the mounting seat (35), one end of the output shaft of the second motor (36) is fixedly sleeved with the first gear (37), and the first gear (37) is meshedly connected with the side teeth of the first gear ring (33).

6. The outer wall grinding device for steel pipe according to claim 5, characterized in that: The transmission structure comprises a groove (42) formed in the middle of the outer side surface of the fixing ring (8); a second gear ring (43) is fixedly sleeved on the side surface of the inner sleeve (29) at the groove (42); two mounting blocks (38) are connected at the rear side of the outer side surface of the fixing ring (8); a transmission rod (39) is movably passed through the mounting block (38); a spiral groove (46) is formed on the transmission rod (39); a rotating sleeve (40) is movably sleeved on the transmission rod (39) between the two mounting blocks (38); the rotating sleeve ( The two ends of the rotating sleeve (40) are respectively tightly attached to the two mounting blocks (38), a second gear (41) is fixedly sleeved in the middle of the rotating sleeve (40), the second gear (41) is meshingly connected with the teeth on the second gear ring (43), an insertion rod (45) is fixedly inserted into one end of the rotating sleeve (40), one end of the insertion rod (45) is slidably set in the spiral groove (46), and the two ends of the transmission rod (39) are fixedly connected to the first vertical plate (44), and the bottom end of the first vertical plate (44) is connected to the bottom plate (1).

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