A spiral steel pipe stable welding equipment

Abstract

The present invention provides a spiral steel pipe stable welding device, comprising a rotating mechanism which is arranged on a base and can stably rotate the positions of two spiral steel pipes, and a welding device which is arranged on the base and can weld the adjacent ends of the two spiral steel pipes. The rotating mechanism comprises two limiting rings which are arranged on the base and located at the two ends of the base and whose axes are colinear, a plurality of rotating cylinders which are inserted into the limiting rings and are arranged in a circular array around the axis direction of the limiting rings, a control component which is arranged on the limiting rings and can control the plurality of rotating cylinders to approach or move away from the center position of the limiting rings, and a rotating component which is arranged on the base and located between the two limiting rings and can control the positions of the two spiral steel pipes to approach each other for fixed rotation. The axis directions of the plurality of rotating cylinders are parallel to the axis directions of the limiting rings, and the rotating cylinders are rotatably connected to the control component. The present invention can conveniently weld the two spiral steel pipes and ensure the stability of welding the two spiral steel pipes.

Description

Technical Field

[0001] The invention relates to the technical field of welding processing equipment, in particular to a spiral steel pipe stable welding device. Background Art

[0002] Automatic submerged arc welding process (including submerged arc cladding and electroslag cladding, etc.) is a welding method in which the arc burns under the flux layer. Its inherent advantages such as stable welding quality, high welding productivity, no arc light and little smoke make it the main welding method in the production of important steel structures such as pressure vessels, pipe section manufacturing, box beams and columns. In recent years, although many new efficient and high-quality welding methods have emerged, the application field of submerged arc welding has not been affected in any way. From the perspective of the share of the weight of the deposited metal of various fusion welding methods, submerged arc welding accounts for about 10%, and it has not changed much for many years.

[0003] Spiral steel pipe is made of strip steel coil as raw material, extruded at room temperature, and welded by automatic submerged arc welding process. Compared with straight seam steel pipe, the biggest feature of spiral steel pipe is that its weld is spiral line type. Spiral steel pipe with a diameter greater than 1 meter is a large-diameter spiral steel pipe. In actual welding, it is necessary to move and weld along the position of the spiral weld, which makes welding more difficult. Under the existing technology, when automatic welding of large-diameter spiral steel pipes is performed by automatic submerged arc welding machine, the welding operation can be completed in two ways. First, keep the position of the welding machine fixed, drive the spiral steel pipe to rotate at a constant speed, and move the spiral steel pipe at a constant speed in accordance with the specific rotation speed, so as to weld the spiral seam. Second, only rotate the spiral steel pipe at a constant speed, and move the welding machine at a constant speed along the axial direction of the spiral steel pipe in accordance with the specific rotation speed, so as to complete the welding of the spiral seam.

[0004] In actual use, it is also necessary to weld different spiral steel pipes. When welding the existing threaded steel pipes, the end faces of one end of the two threaded steel pipes are controlled to fit together, and then the two threaded steel pipes are controlled to rotate synchronously in the same direction, and the adjacent ends of the two threaded steel pipes are welded with the welding device, so as to increase the length of the threaded steel pipe. However, when welding the two existing threaded steel pipes, only the ends of the threaded steel pipes are fixed. Since the threaded steel pipes themselves are long, the pressure drop at the fixed position of the threaded steel pipes increases. When the fixed position of the two threaded steel pipes is fixed and rotated, the fixed position of the threaded steel pipes will be deformed or even damaged, which makes it inconvenient to ensure that the adjacent ends of the two spiral steel pipes can be stably rotated and welded. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a spiral steel pipe stable welding device, which can conveniently weld two spiral steel pipes and ensure the stability of the welding between the two spiral steel pipes.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spiral steel pipe stable welding device, comprising a rotating mechanism arranged on a base and stably rotating the positions of two spiral steel pipes, and a welding device arranged on the base and welding the adjacent ends of the two spiral steel pipes, the rotating mechanism comprising two limit rings arranged on the base and located at both ends of the base and with colinear axes, a plurality of rotating cylinders penetrating the limit rings and arranged in a circular array around the axis direction of the limit rings, a control component arranged on the limit rings and controlling the plurality of rotating cylinders to approach or move away from the center position of the limit rings, and a rotating component arranged on the base and located between the two limit rings and controlling the positions of the two spiral steel pipes to approach each other for fixed rotation, the axis direction of the plurality of rotating cylinders is parallel to the axis direction of the limit rings, and the rotating cylinders are rotationally connected to the control component;

[0007] The rotating assembly includes two fixing members arranged on the base and located between the two limiting rings and symmetrical with respect to the welding device, the fixing members include an adjusting toothed ring arranged on the base and located between the welding device and the limiting ring, a driven ring arranged in parallel with the adjusting toothed ring at one end of the adjusting toothed ring adjacent to the welding device, a plurality of positioning blocks arranged in a circular array between the driven ring and the adjusting toothed ring in the direction of the adjusting toothed ring axis, an adjusting structure arranged on the base and controlling the plurality of positioning blocks to approach or move away from each other, and a rotating structure arranged on the base and controlling the plurality of positioning blocks to rotate around the adjusting toothed ring axis, the limiting ring axis, the adjusting toothed ring axis and the driven ring axis being collinear;

[0008] The adjustment structure includes two linkage rods which are symmetrically arranged about the positioning block and whose adjacent ends are rotatably connected to the two ends of the positioning block and whose ends are rotatably connected to the adjacent end faces of the adjusting gear ring and the driven ring, a bidirectional screw rod which is passed through the top end face of the base and is located in a control groove between the two adjusting gear rings, two control blocks which are sleeved on the rod bodies at both ends of the bidirectional screw rod through threaded connections at the two bottom ends, and two first fixing rings which are respectively passed through the inner rings of different adjusting gear rings and are fixedly connected to the top side faces of different control blocks with end faces away from each other, a second fixing ring is rotatably connected to the inner ring of the driven ring, and the end face of the second fixing ring is fixedly arranged on the top end face of the base through a fixing block.

[0009] Preferably, the rotating structure includes an adjusting motor arranged on the base, and an adjusting gear arranged on the output end of the adjusting motor and meshing with the adjusting gear ring in synchronous movement.

[0010] Preferably, the control component includes four fixed rings fixed on the side of the limit ring and arranged in a circular array around the axial direction of the limit ring, four limit screws that are movably arranged in the inner ring of the fixed ring and movably pass through the limit ring and are arranged in the inner ring of the limit ring, a rotating gear ring that is movably arranged in the fixed ring and is sleeved on the rod body of the limit screw through a threaded connection, and a control member that is arranged on the limit ring and controls the four rotating gear rings to rotate, one end of the four limit screws that pass through the inner ring of the limit ring are respectively connected to different rotating cylinders through buffer members, a guide groove is opened on the rod body of the limit screw in the length direction, a sliding rod is slidably arranged in the guide groove, and the sliding rod is fixed on the limit ring.

[0011] Preferably, the control component includes a limiting gear ring rotatably arranged on the end face of one end of the limiting ring adjacent to the welding device, a limiting rack fixedly arranged on the end face of one end of the limiting gear ring adjacent to the rotating gear ring and meshing with four rotating gear rings, and a limiting motor arranged on the side face of the limiting ring and having a driving gear at the output end, and the driving gear meshes with the limiting gear ring.

[0012] Preferably, the buffer component includes a buffer plate fixedly arranged on one end of the inner ring of the limit ring through the middle position of the side surface through the limit screw, a clamping block sleeved on the buffer plate through a buffer groove opened on the end face, and a buffer spring whose bottom end is fixed on the bottom wall of the buffer groove and whose top end is fixedly connected to the end face of the buffer plate, and the clamping block is rotatably connected to the rotating cylinder away from the end face of one end of the limit screw.

[0013] Preferably, the buffer component also includes four sliding rods which are respectively and parallelly arranged on the end faces of four different limit screws away from the limit gear ring, and four sliding blocks which are respectively movably sleeved on the rod bodies of the four sliding rods and fixedly connected to the end faces of the limit rings. The sliding rod is inserted into the limit ring and one end is vertically fixed on the end face of the buffer plate, and the end of the sliding rod away from the limit ring is connected to the end of the limit screw through a connecting block.

[0014] Preferably, the welding device is arranged on the base through a lifting assembly, the lifting assembly includes a vertical block vertically fixedly arranged in the middle of one side of the top end face of the base, a lifting member arranged on the end face of one end of the vertical block adjacent to the driven ring, and a horizontal block arranged horizontally and arranged on the vertical block through the lifting member, and the welding device is arranged on the horizontal block.

[0015] Preferably, the lifting member includes a limit rod arranged in a limit groove opened on the end face of the vertical block along the vertical direction, a limit block movably mounted on the rod body of the limit rod and fixedly connected to the horizontal block on the side, a lifting screw rod arranged in a lifting groove opened on the end face of the vertical block along the vertical direction, and a threaded block mounted on the rod body of the lifting screw rod through a threaded connection, and the threaded block is fixedly connected to the side of the horizontal block.

[0016] The beneficial effects of the present invention are as follows: when welding two spiral steel pipes, the two spiral steel pipes are respectively passed through two limit rings, and one end of the two spiral steel pipes to be welded is connected by a rotating assembly, and the adjacent ends of the two spiral steel pipes are driven close to each other by the rotating assembly, and by controlling the stable rotation of the two spiral steel pipes, the stable rotation welding of the adjacent ends of the two spiral steel pipes can be guaranteed, the two spiral steel pipes can be welded conveniently, and the stability of the welding between the two spiral steel pipes is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the simplified structure of the spiral steel pipe stable welding equipment proposed by the present invention.

[0019] Figure 2 This is a schematic diagram of the side structure of the spiral steel pipe stable welding equipment proposed by the present invention.

[0020] Figure 3 It is a schematic diagram of the control component structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the back structure of the control component of the present invention.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the control component of the present invention.

[0023] Figure 6 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0024] In the figure: 1. base; 2. vertical block; 3. limit groove; 4. limit rod; 5. cross block; 6. welding device; 7. lifting groove; 8. lifting screw; 9. limit ring; 10. fixed block; 11. first fixed ring; 12. adjusting gear ring; 13. adjusting gear; 14. adjusting motor; 15. second fixed ring; 16. driven ring; 17. linkage rod; 18. positioning block; 19. control groove; 20. two-way screw; 21. control block; 22. limit gear ring; 23. limit screw; 24. slide rod; 25. fixed ring; 26. clamping block; 27. rotating cylinder; 28. slide block; 29. ​​limit motor; 30. limit rack; 31. guide groove; 32. rotating gear ring; 33. buffer groove; 34. buffer spring. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0026] See also Figure 1-6 A spiral steel pipe stable welding device, including a rotating mechanism arranged on a base 1 and used to stably rotate the positions of two spiral steel pipes, and a welding device 6 arranged on the base 1 and used to weld the adjacent ends of the two spiral steel pipes. The rotating mechanism includes two limit rings 9 arranged on the base 1 and located at both ends of the base 1 and with colinear axes, a plurality of rotating cylinders 27 penetrating the limit rings 9 and arranged in a circular array around the axis direction of the limit rings 9, a control component arranged on the limit rings 9 and used to control the plurality of rotating cylinders 27 to approach or move away from the center position of the limit rings 9, and a rotating component arranged on the base 1 and located between the two limit rings 9 and used to control the positions of the two spiral steel pipes to approach each other for fixed rotation. The axis direction of the plurality of rotating cylinders 27 is parallel to the axis direction of the limit rings 9, and the rotating cylinders 27 are rotationally connected to the control component.

[0027] like Figure 1-6 As shown, the two spiral steel pipes are directly passed through the different limit rings 9 respectively, and the adjacent ends of the two spiral steel pipes are respectively inserted into the moving components, and the adjacent ends of the two spiral steel pipes are stably fixed by the moving components and tightly fitted to each other, and then the adjacent ends of the two spiral steel pipes are controlled to rotate stably, and then the adjacent ends of the two spiral steel pipes are stably welded in conjunction with the welding device 6, thereby ensuring the stable rotation welding of the two spiral steel pipes, improving the welding effect of the spiral steel pipes, and conveniently welding the two spiral steel pipes, and ensuring the stability of the welding between the two spiral steel pipes.

[0028] The rotating assembly includes two fixing parts which are arranged on the base 1 and located between the two limit rings 9 and are symmetrical with respect to the welding device 6. The fixing parts include an adjusting toothed ring 12 which is arranged on the base 1 and located between the welding device 6 and the limit ring 9, a driven ring 16 which is arranged parallel to the adjusting toothed ring 12 and is arranged at one end of the adjusting toothed ring 12 adjacent to the welding device 6, a plurality of positioning blocks 18 which are arranged in a circular array between the driven ring 16 and the adjusting toothed ring 12 in the axial direction of the adjusting toothed ring 12, an adjusting structure which is arranged on the base 1 and controls the plurality of positioning blocks 18 to approach or move away from each other, and a rotating structure which is arranged on the base 1 and controls the plurality of positioning blocks 18 to rotate around the axial direction of the adjusting toothed ring 12. The axis of the limit ring 9, the axis of the adjusting toothed ring 12 and the axis of the driven ring 16 are collinear.

[0029] like Figure 1-2As shown, the two spiral steel pipes pass through the inner rings of two different limit rings 9 and are respectively inserted into the two adjusting tooth rings 12, and the two adjacent ends are tightly fitted. The multiple positioning blocks 18 are driven to approach each other through the adjustment component, so that the positions of the spiral steel pipes can be fixed by the multiple positioning blocks 18. The rotating structure can drive the two spiral steel pipes to rotate synchronously at a stable distance. The two spiral steel pipes can be welded by the welding device 6, so that the two spiral steel pipes can be welded.

[0030] The adjustment structure includes two linkage rods 17 which are symmetrically arranged about the positioning block 18 and whose adjacent ends are rotatably connected to the two ends of the positioning block 18 and whose ends are rotatably connected to the adjacent end faces of the adjusting gear ring 12 and the driven ring 16 at one end away from each other, a bidirectional screw rod 20 which is inserted through the top end face of the base 1 and is located between the two adjusting gear rings 12 and has a control groove 19, two bottom ends of which are sleeved on the rod bodies at both ends of the bidirectional screw rod 20 through threaded connection, and two first fixed rings 11 which are respectively inserted through the inner rings of different adjusting gear rings 12 and are fixedly connected to the top sides of different control blocks 21 at the end faces away from each other, a second fixed ring 15 is rotatably connected in the inner ring of the driven ring 16, and the end face of the second fixed ring 15 is fixedly arranged on the top end face of the base 1 through the fixed block 10.

[0031] like Figure 1-2 As shown, when the two-way screw rod 20 is driven by the motor to rotate and drive the two control blocks 21 which are sleeved on the rod bodies at both ends of the two-way screw rod 20 through the threaded connection to approach each other, the first fixing ring 11 set on the control block 21 can be driven to move, that is, the two first fixing rings 11 are controlled to approach each other, and the positioning blocks 18 set on the ends of the two linkage rods 17 can be driven to move toward the surface of the spiral steel pipe through the action of the linkage rod 17, that is, the position of the spiral steel pipe can be fixed by setting a plurality of positioning blocks 18 between the adjusting toothed ring 12 and the driven ring 16, and when the adjusting toothed ring 12 moves toward the driven ring 16, the positioning blocks 18 can be fixed by setting a plurality of positioning blocks 18 between the adjusting toothed ring 12 and the driven ring 16. 6, that is, when the multiple positioning blocks 18 move toward the surface of the spiral steel pipe, the positioning blocks 18 arranged on both sides of the welding device 6 will also be close to each other, that is, the position of the spiral steel pipe can be fixed by the multiple positioning blocks 18, and the two spiral steel pipes can be controlled to be close to each other, ensuring that the adjacent ends of the two spiral steel pipes are closely fitted, thereby facilitating the subsequent welding of the ends of the spiral steel pipes by the welding device, improving the welding effect of the ends of the spiral steel pipes, and conveniently welding the two spiral steel pipes, and ensuring the stability of the welding between the two spiral steel pipes.

[0032] The rotating structure includes an adjusting motor 14 arranged on the base 1 , and an adjusting gear 13 arranged on the output end of the adjusting motor 14 and meshing with the adjusting gear ring 12 in synchronous movement.

[0033] like Figure 1-2As shown, the adjusting motor 14 is arranged on the top end face of the base 1 through a sliding block. When the two adjusting gear rings 12 move, the adjusting motor 14 slides synchronously on the top end face of the base 1, ensuring that the adjusting gear 13 is engaged with the adjusting gear ring 12. The adjusting gear ring 12 can be controlled to rotate by the adjusting motor 14.

[0034] The control component includes four fixed rings 25 fixed on the side of the limit ring 9 and arranged in a circular array around the axial direction of the limit ring 9, four limit screws 23 that are movably arranged in the inner ring of the fixed ring 25 and movably pass through the limit ring 9 and are arranged in the inner ring of the limit ring 9, a rotating gear ring 32 that is movably arranged in the fixed ring 25 and is sleeved on the rod body of the limit screw 23 through a threaded connection, and a control member that is arranged on the limit ring 9 and controls the four rotating gear rings 32 to rotate. One end of the four limit screws 23 that pass through the inner ring of the limit ring 9 is connected to different rotating cylinders 27 through a buffer member. A guide groove 31 is opened on the rod body of the limit screw 23 along the length direction, and a sliding rod is slidably arranged in the guide groove 31, and the sliding rod is fixedly arranged on the limit ring 9.

[0035] like Figure 3-5 As shown, after the two spiral steel pipes are respectively inserted into different limiting rings 9, the rotating gear ring 32 driven by the control member is rotated, which can drive the limiting screw rod 23 threadedly connected to the rotating gear ring 32 to move along the axial direction of the rotating gear ring 32, so as to control the four rotating cylinders 27 inserted into the limiting ring 9 to approach each other. At this time, the four rotating cylinders 27 are tightly fitted with the side surfaces of the spiral steel pipes, so as to limit the position of the spiral steel pipes inserted into the limiting ring 9. When the two spiral steel pipes are controlled to rotate, the position of the tube body of the spiral steel pipe at one end away from the welding device 6 is located in the four rotating cylinders 27 and rotates immediately, thereby ensuring the stable rotation of the two spiral steel pipes located on the base 1, thereby ensuring the stable welding of the adjacent ends of the two spiral steel pipes, thereby improving the welding effect of the spiral steel pipes, and stably welding spiral steel pipes of different sizes, thereby improving the scope of use of the device.

[0036] The control component includes a limiting gear ring 22 rotatably arranged on the end face of the limiting ring 9 adjacent to the welding device 6, a limiting rack 30 fixedly arranged on the end face of the limiting gear ring 22 adjacent to the rotating gear ring 32 and meshing with the four rotating gear rings 32, and a limiting motor 29 arranged on the side of the limiting ring 9 and having a driving gear at the output end, and the driving gear is meshed with the limiting gear ring 22.

[0037] like Figure 4-5 As shown, the limit motor 29 drives the driving gear to rotate, thereby driving the limit rack 30 arranged on the end face of the limit gear ring 22 to rotate, so as to facilitate driving the four rotating gear rings 32 to rotate stably and synchronously.

[0038] The buffer component includes a buffer plate fixedly arranged at the middle position of the side surface and passing through the limit screw 23 on one end of the inner ring of the limit ring 9, a clamping block 26 sleeved on the buffer plate through a buffer groove 33 provided on the end face, and a buffer spring 34 whose bottom end is fixedly arranged on the bottom wall of the buffer groove 33 and whose top end is fixedly connected to the end face of the buffer plate. The clamping block 26 is rotatably connected to the rotating cylinder 27 away from the end face of one end of the limit screw 23.

[0039] like Figure 1-6 As shown, when the four limiting screw rods 23 drive the four rotating cylinders 27 to approach each other and limit the position of the spiral steel pipe passing through the limiting ring 9, the lifting plate will be driven to move toward the bottom wall of the buffer groove 33, and the buffer spring 34 arranged between the lifting plate and the bottom wall of the buffer groove 33 will be compressed, which can ensure that the four rotating cylinders 27 are closely fitted to the surface of the spiral steel pipe. When the spiral steel pipe rotates, the four rotating cylinders 27 also rotate, which ensures that the tube body of the spiral steel pipe passing through the limiting ring 9 is relatively stable, thereby ensuring the subsequent stable welding of the spiral steel pipe.

[0040] The buffer component also includes four sliding rods 24, which are respectively and parallelly arranged on the end faces of four different limit screws 23 away from the limit gear ring 22, and four sliding blocks 28, which are respectively movably sleeved on the rods of the four sliding rods 24 and fixedly connected to the end faces of the limit ring 9. The sliding rod 24 is inserted into the limit ring 9 and one end is vertically fixed on the end face of the buffer plate, and the end of the sliding rod 24 away from the limit ring 9 is connected to the end of the limit screw 23 through a connecting block.

[0041] like Figure 4-5 As shown, when the limiting screw rod 23 is slidably arranged in the guide groove 31 provided on the rod body, it is convenient to ensure that the limiting screw rod 23 moves stably along the length direction of the rod body.

[0042] The welding device 6 is arranged on the base 1 through a lifting assembly, and the lifting assembly includes a vertical block 2 vertically fixedly arranged in the middle of one side of the top end face of the base 1, a lifting member arranged on the end face of the vertical block 2 adjacent to the driven ring 16, and a horizontal block 5 horizontally arranged and arranged on the vertical block 2 through the lifting member, and the welding device 6 is arranged on the horizontal block 5.

[0043] The lifting member includes a limit rod 4 arranged in a limit groove 3 provided on the end face of the vertical block 2 along the vertical direction, a limit block movably sleeved on the rod body of the limit rod 4 and fixedly connected to the side of the horizontal block 5, a lifting screw rod 8 arranged in a lifting groove 7 provided on the end face of the vertical block 2 along the vertical direction, and a threaded block sleeved on the rod body of the lifting screw rod 8 through a threaded connection, and the threaded block is fixedly connected to the side of the horizontal block 5.

[0044] like Figure 1-6As shown, when welding the adjacent ends of two spiral steel pipes, the lifting screw 8 is first driven by a motor to rotate, and the threaded block sleeved on the rod body of the lifting screw 8 drives the welding device 6 on the cross block 5 to move to the end positions of the two threaded steel pipes through a threaded connection, so as to facilitate welding of the adjacent ends of two threaded steel pipes of different sizes, and a limiting block is also provided on the side of the cross block 5, and the limiting block is movably sleeved on the rod body of the limiting rod 4 to ensure that the cross block 5 can stably lift and lower in the vertical direction, so as to facilitate controlling the welding device 6 to move to the required welding position of the two spiral steel pipes.

[0045] The welding device 6 adopts a submerged arc welding machine, which is arranged on the horizontal block 5. By controlling the lifting of the horizontal block 5, it is convenient to control the submerged arc welding machine to move to the welding position between the two spiral steel pipes.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A spiral steel pipe stable welding device, comprising a rotating mechanism arranged on a base (1) and capable of stably rotating the positions of two spiral steel pipes, and a welding device (6) arranged on the base (1) and capable of welding adjacent ends of the two spiral steel pipes, characterized in that: The rotating mechanism comprises two limiting rings (9) arranged on the base (1) and located at two ends of the base (1) and with their axes colinear, a plurality of rotating cylinders (27) penetrating the limiting rings (9) and arranged in a circular array around the axis direction of the limiting rings (9), a control component arranged on the limiting rings (9) and controlling the plurality of rotating cylinders (27) to approach or move away from the center position of the limiting rings (9), and a rotating component arranged on the base (1) and located between the two limiting rings (9) and controlling the positions of the two spiral steel pipes to approach each other for fixed rotation, the axis directions of the plurality of rotating cylinders (27) being parallel to the axis direction of the limiting rings (9), and the rotating cylinders (27) being rotationally connected to the control component; The rotating assembly comprises two fixing members arranged on a base (1) and located between two limiting rings (9) and symmetrical with respect to the welding device (6), the fixing members comprising an adjusting toothed ring (12) arranged on the base (1) and located between the welding device (6) and the limiting ring (9), a driven ring (16) arranged parallel to the adjusting toothed ring (12) at one end of the adjusting toothed ring (12) adjacent to the welding device (6), a plurality of positioning blocks (18) arranged in a circular array between the driven ring (16) and the adjusting toothed ring (12) in the direction of the axis of the adjusting toothed ring (12), an adjusting structure arranged on the base (1) and controlling the plurality of positioning blocks (18) to move closer to or farther from each other, and a rotating structure arranged on the base (1) and controlling the plurality of positioning blocks (18) to rotate around the axis of the adjusting toothed ring (12), wherein the axis of the limiting ring (9), the axis of the adjusting toothed ring (12) and the axis of the driven ring (16) are collinear; The adjustment structure comprises two linkage rods (17) which are arranged symmetrically with respect to a positioning block (18) and whose adjacent ends are rotatably connected to the two ends of the positioning block (18) and whose ends are rotatably connected to the adjacent end faces of the adjusting toothed ring (12) and the driven ring (16) at opposite ends; a bidirectional screw rod (20) which is inserted through a control groove (19) provided between the two adjusting toothed rings (12) at the top end face of the base (1); two control blocks (21) whose bottom ends are sleeved on the rod bodies at the two ends of the bidirectional screw rod (20) through threaded connection; and two first fixed rings (11) which are respectively inserted through the inner rings of different adjusting toothed rings (12) and whose end faces are respectively fixedly connected to the top side faces of different control blocks (21) at opposite ends; a second fixed ring (15) is rotatably connected in the inner ring of the driven ring (16), and the end face of the second fixed ring (15) is fixedly arranged on the top end face of the base (1) through a fixed block (10).

2. A spiral steel pipe stable welding equipment according to claim 1, characterized in that: The rotating structure comprises an adjusting motor (14) arranged on a base (1), and an adjusting gear (13) arranged on an output end of the adjusting motor (14) and synchronously moving and meshing with an adjusting gear ring (12).

3. A spiral steel pipe stable welding equipment according to claim 2, characterized in that: The control assembly comprises four fixed rings (25) fixedly arranged on the side of the limiting ring (9) and arranged in a circumferential array around the axis direction of the limiting ring (9), four limiting screw rods (23) which are movably arranged in the inner ring of the fixing ring (25) and movably penetrate the limiting ring (9) and are arranged in the inner ring of the limiting ring (9), a rotating toothed ring (32) which is movably arranged in the fixing ring (25) and sleeved on the rod body of the limiting screw rod (23) through a threaded connection, and a control member arranged on the limiting ring (9) and controlling the four rotating toothed rings (32) to rotate, one end of the four limiting screw rods (23) which are arranged in the inner ring of the limiting ring (9) is connected to different rotating cylinders (27) through a buffer member, a guide groove (31) is opened on the rod body of the limiting screw rod (23) along the length direction, a sliding rod is slidably arranged in the guide groove (31), and the sliding rod is fixedly arranged on the limiting ring (9).

4. The spiral steel pipe stable welding equipment according to claim 3 is characterized by: The control component comprises a limit toothed ring (22) rotatably arranged on an end surface of a limit ring (9) adjacent to a welding device (6), a limit rack (30) fixedly arranged on an end surface of the limit toothed ring (22) adjacent to a rotating toothed ring (32) and meshing with four rotating toothed rings (32), and a limit motor (29) arranged on a side surface of the limit ring (9) and having a driving gear arranged at an output end, the driving gear meshing with the limit toothed ring (22).

5. The spiral steel pipe stable welding equipment according to claim 4 is characterized in that: The buffer member comprises a buffer plate fixedly arranged at the middle position of the side surface and passing through the inner ring of the limiting ring (9) and a limiting screw rod (23), a clamping block (26) sleeved on the buffer plate through a buffer groove (33) provided on the end surface, and a buffer spring (34) whose bottom end is fixedly arranged on the bottom wall of the buffer groove (33) and whose top end is fixedly connected to the end surface of the buffer plate. The clamping block (26) is rotatably connected to the rotating cylinder (27) away from the end surface of one end of the limiting screw rod (23).

6. The spiral steel pipe stable welding equipment according to claim 5, characterized in that: The buffer component also includes four slide bars (24) which are respectively and one by one arranged in parallel on the end faces of four different limit screw rods (23) away from the limit tooth ring (22), and four sliders (28) which are respectively movably sleeved on the rod bodies of the four slide bars (24) and fixedly connected to the end face of the limit ring (9). One end of the slide bar (24) is inserted into the limit ring (9) and is vertically fixedly arranged on the end face of the buffer plate, and the end of the slide bar (24) away from the limit ring (9) is connected to the end of the limit screw rod (23) through a connecting block.

7. The spiral steel pipe stable welding equipment according to claim 6, characterized in that: The welding device (6) is arranged on the base (1) through a lifting assembly, the lifting assembly comprising a vertical block (2) fixedly arranged in a middle position on one side of the top end face of the base (1), a lifting member arranged on an end face of the vertical block (2) adjacent to the driven ring (16), and a horizontal block (5) arranged transversely and arranged on the vertical block (2) through the lifting member, and the welding device (6) is arranged on the horizontal block (5).

8. The spiral steel pipe stable welding equipment according to claim 7, characterized in that: The lifting member comprises a limiting rod (4) arranged in a limiting groove (3) provided on the end surface of the vertical block (2) in the vertical direction, a limiting block movably sleeved on the rod body of the limiting rod (4) and fixedly connected to the side of the horizontal block (5), a lifting screw rod (8) arranged in a lifting groove (7) provided on the end surface of the vertical block (2) in the vertical direction, and a threaded block sleeved on the rod body of the lifting screw rod (8) through a threaded connection, and the threaded block is fixedly connected to the side of the horizontal block (5).

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