A shell girth weld welding rotary platform

Abstract

The application discloses a shell ring weld joint welding rotating platform and relates to the technical field of welding equipment. The shell ring weld joint welding rotating platform comprises a ring guide rail arranged above a shell to-be-welded pipeline, two groups of ring sliding tables capable of moving around the ring guide rail in the circumferential direction are arranged on the ring guide rail in the circumferential direction, clamping assemblies are arranged on each group of ring sliding tables respectively, driving arms are fixedly connected to the ring sliding tables, and the two groups of driving arms push the clamping assemblies on the ring sliding tables to rotate through driving components. Through the rotary driving of the two groups of clamping assemblies, in the initial stage of welding a saddle opening of the shell, the two groups of clamping assemblies are rotated and moved to an opposite state, the shell to-be-welded pipeline is clamped, and a stable welding platform is provided for multi-point positioning welding of the saddle opening. When the shell saddle opening is welded, the two groups of clamping assemblies are rotated and moved to an included angle state and travel synchronously along a welding path, the to-be-welded pipeline is dynamically clamped, and the contraction and deformation of the pipelines on both sides of the welding point are constrained.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a rotating platform for welding circumferential weld seams in a housing. Background Technology

[0002] Vertical welding of circular tubes (commonly known as "saddle-mouth" welding) is a very common structure in annular shells (such as pressure vessels, pipes, and cylindrical workpieces). During welding, two circular tubes intersect perpendicularly, and then welding is performed at the intersection of the two tube walls. Since the intersection line of the tube walls is a spatial curve (intersection line) rather than a straight line, the material must be precisely cut according to the intersection line trajectory during the welding process. Therefore, the matching "saddle-mouth" welding equipment is very important in the vertical welding of circular tubes.

[0003] For example, a saddle-mouth welding positioning robot with announcement number CN113910263B fixes the welding part by using a clamping telescopic rod to drive the clamping plate. Then, it uses a translational sleeve and welding telescopic rod to realize the arc movement of the welding plate. It also uses an adjusting motor to drive the rotating plate to rotate and adjust the welding rod angle, so that it can automatically reposition during the welding process, and the welding accuracy is greatly improved.

[0004] During the welding of the "saddle joint" of the pipe shell, the branch pipe, being a cantilever structure with relatively weak overall rigidity, is the main load-bearing object for welding deformation. In contrast, the main pipe is large and rigid, with almost no overall deformation and a relatively stable overall geometry. Therefore, when welding the branch pipe to the main pipe, the welded portion of the branch pipe experiences stress concentration (the welded part is already "fixed," adding rigid constraints to the structure) and deformation pulling (the cooled and contracted area of ​​the first welded part forcibly "pulls" the branch pipe towards the welded side). This causes the branch pipe at the welded part to deform under the action of contraction force and stress, resulting in deviations in its verticality. Consequently, the welding deformation tends to increase as the welding progresses, easily leading to problems such as excessively large weld openings, poor fit, and incomplete welding. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rotating platform for welding circumferential weld seams in shells, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rotating platform for welding circumferential welds on a shell, comprising a rotating table and a bottom support platform located on one side of the rotating path of the rotating table. The bottom support platform drives the shell to rise and fall, so that the central axis of the shell coincides with the rotation center of the rotating table. The platform further comprises: an annular guide rail, arranged above the pipe to be welded on the shell; two sets of annular slides capable of moving circumferentially around the annular guide rail are provided circumferentially on the annular guide rail, and clamping components are provided on each set of annular slides. In the initial state, the two sets of clamping components clamp the pipe to be welded symmetrically to maintain multi-point positioning welding of the pipe. The verticality of the pipe is ensured by two sets of drive arms, each fixed to an annular slide. The two sets of drive arms are coaxial around the annular guide rail and can rotate circumferentially along the annular guide rail via drive components. This causes the drive arms to push the clamping components on the annular slide to rotate. After multi-point positioning welding of the pipe to be welded, one set of drive arms is first pushed to rotate, so that the two sets of clamping components form an angle between them, with the welding point between the angles. Then, the two sets of drive arms are pushed to rotate synchronously, so that the two sets of clamping components move along the weld seam of the pipe to be welded, constraining the welding deformation of both welded and unwelded parts, thereby maintaining the verticality of the pipe to be welded.

[0007] Furthermore, it also includes: two sets of spline grooves, located at the coaxial center of the two sets of drive arms; and a drive shaft located at the center of the spline grooves, wherein the bottom end of the drive shaft is provided with spline teeth, which can mesh with the two sets of spline grooves in sequence.

[0008] Furthermore, it also includes: a support cylinder, fixedly connected above the annular guide rail, wherein a second sliding groove is provided inside the support cylinder, and a third sliding groove is provided below the second sliding groove; a fixing sleeve, provided in the axial direction of the drive shaft, wherein a second sliding column is provided on one side of the fixing sleeve, and the second sliding column can slide along the second sliding groove and the third sliding groove; an opening groove is provided on the track path of the second sliding groove to guide the second sliding column to slide from the second sliding groove to the third sliding groove, so that the spline teeth mesh with the two sets of spline grooves.

[0009] Furthermore, a sway guide plate is provided on the opening path of the opening groove to guide the second sliding column to slide between the second sliding groove and the third sliding groove. The sway guide plate is also provided with a sway shaft at its rotating shaft end, and a torsion spring is provided at one end of the sway shaft so that the second sliding column sways and makes way when it slides along the third sliding groove and passes the sway guide plate.

[0010] Furthermore, the clamping assembly includes: a first sliding groove, which is circumferentially formed around the support cylinder; a first support, which is fixedly connected to the annular sliding platform, wherein two sets of first lifting rods are slidably installed on the first support, and a first clamping wheel is provided at the bottom end of the first lifting rod, the two sets of first clamping wheels clamping the inner and outer walls of the pipe to be welded; a first sliding column is provided at the top end of the first lifting rod, and the first sliding column can slide along the first sliding groove.

[0011] Furthermore, the track path of the first chute is the same as the weld path of the pipe to be welded, so that when the first sliding column slides along the first chute, it guides the first clamping wheel to travel along the welding path of the pipe to be welded.

[0012] Furthermore, the clamping assembly further includes: a second support fixedly connected to an annular slide; a fixed rod fixedly connected to one side of the second support, with an arc-shaped clamping block at the bottom end of the fixed rod, the arc-shaped clamping block clamping the inner wall of the pipe to be welded; and a second lifting rod slidably installed on the other side of the second support, wherein the bottom end of the second lifting rod is provided with a second clamping wheel, the second clamping wheel clamping the outer wall of the pipe to be welded, and the second lifting rod is also axially fitted with a second spring to drive the second clamping wheel to move toward the weld seam of the pipe to be welded.

[0013] Furthermore, the clamping assembly also includes: a fourth sliding groove, formed on the fixed rod, the fourth sliding groove being an inclined groove structure; a rotating seat, rotatably mounted on the second support, the rotating seat slidably supporting the second lifting rod; a third sliding column, located at the top of the second lifting rod, with an elastic piece provided between the third sliding column and the second lifting rod; the third sliding column is located on the track path of the fourth sliding groove, used to apply a yaw thrust to the second lifting rod, so that during the movement of the second clamping wheel along the weld seam of the pipe to be welded, it drives the second clamping wheel to apply static pressure to the pipe to be welded.

[0014] Furthermore, the fixing rod and the third sliding column are made of magnetic material, so that the fixing rod and the third sliding column are magnetically connected.

[0015] Furthermore, the upper half of the drive shaft is a rhomboid shaft structure; the drive component includes a third motor located above the support cylinder, and the output end of the third motor is slidably connected to the rhomboid shaft structure.

[0016] The present invention has the following beneficial effects: (1) The rotating platform for welding the circumferential weld of the shell, through the rotational drive of the two sets of clamping components, in the initial stage of welding the saddle opening of the shell, the two sets of clamping components rotate to the opposite state, clamping the pipe to be welded on the shell, providing a stable welding platform for multi-point positioning welding of the saddle opening. When welding the saddle opening of the shell, the two sets of clamping components rotate to the angled state and move synchronously with the welding path, dynamically clamping the pipe to be welded, constraining the contraction and deformation of the pipes on both sides of the weld point (the welded part and the unwelded part), maintaining the verticality of the pipe to be welded on the shell during the welding process, and improving the welding accuracy.

[0017] (2) The rotating platform for welding the circumferential weld of the shell, through the clamping and limiting action of two sets of clamping components on the inner and outer walls of the shell to be welded, and the synchronous movement with the weld point, can always act on the roller clamping of the pipes on both sides of the to be welded part, forming synchronous constraint on the deformation of the welded and unwelded parts on the welding path, reducing the deformation of the shell due to stress, shrinkage, etc. during the welding process, and preventing the welding tilt caused by "pulling" the pipe to be welded, maintaining the verticality of the entire weld, so as to improve the welding accuracy. In addition, through the dynamic clamping action of the clamping components, it can not only passively constrain the deformation when welding a thicker shell, but also actively constrain the deformation when welding a thinner shell.

[0018] (3) The rotating platform for welding the circumferential weld of the shell can not only dynamically constrain the deformation of the pipes on both sides of the weld point by using the clamping components to move around the circumference of the shell “saddle opening”, but also has flexible movement characteristics, providing clamping limit when symmetrically welding the shell “saddle opening”, and providing stable constraint support for the symmetrical welding of the shell “saddle opening”.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the welding assembly according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the first structure of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the second structure of Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the third structure in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the clamping assembly clamping the pipe to be welded in Embodiment 1 of the present invention; Figure 6 This is a first assembly diagram of the clamping assembly in Embodiment 1 of the present invention; Figure 7 This is a second assembly diagram of the clamping assembly in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the rotation drive of the clamping component in Embodiment 1 of the present invention; Figure 9 This is an exploded view of the annular guide rail, annular slide, and drive arm in Embodiment 1 of the present invention; Figure 10 This is a schematic diagram of the overall assembly of the drive shaft in Embodiment 1 of the present invention; Figure 11 This is a schematic diagram of the arrangement of the second and third slide grooves in Embodiment 1 of the present invention; Figure 12This is a schematic diagram of the overall assembly of the oscillation guide plate in Embodiment 1 of the present invention; Figure 13 This is a diagram showing the state of two sets of clamping components symmetrically clamping the pipe to be welded in Embodiment 1 of the present invention; Figure 14 (a), (b), (c), and (d) in the figure are, in order, diagrams showing the changes in the welding path state of the symmetrical welding of the shell in Embodiment 1 of the present invention; Figure 15 This is a schematic diagram of the clamping assembly clamping the pipe to be welded in Embodiment 2 of the present invention; Figure 16 This is an assembly diagram of the clamping component in Embodiment 2 of the present invention; Figure 17 This is an exploded view of the clamping component in Embodiment 2 of the present invention.

[0021] In the diagram, 1. Frame; 2. Rotary table; 3. First motor; 4. First slide table; 5. Second motor; 6. First lead screw; 7. Base support platform; 710. Second lead screw; 720. Second slide table; 8. Support platform; 9. Support arm; 10. Electric rod; 11. Third motor; 12. Support cylinder; 1210. First slide groove; 13. First support; 14. First lifting rod; 1410. First sliding column; 15. First clamping wheel; 16. Circular guide rail; 17. Circular slide table; 18. Drive arm; 1810. Flower 19. Keyway; 20. Drive shaft; 21. Spline teeth; 21. Fixing sleeve; 2110. Second slide column; 22. First spring; 23. Second slide groove; 24. Third slide groove; 25. Opening groove; 26. Yaw guide plate; 2610. Yaw shaft; 2620. Torsion spring; 27. Second support; 28. Second lifting rod; 2810. Rotary seat; 2820. Elastic plate; 2830. Third slide column; 29. ​​Second clamping wheel; 30. Second spring; 31. Fixing rod; 3110. Fourth slide groove; 32. Arc-shaped clamping block. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] The following is based on Figures 1-17 This invention describes a rotating platform for welding circumferential weld seams in a housing, as provided in an embodiment of the present invention.

[0025] Example 1, as Figures 1-7 , Figure 13 State diagram Figure 14 As shown in the state change diagrams (a), (b), (c), and (d), a rotating platform for welding circumferential welds on a shell includes a frame 1. A first motor 3 is mounted on one side of the frame 1, and a rotating platform 2 is located on the output shaft of the first motor 3. A first slide 4 is located on one side of the rotating platform 2, and a first lead screw 6 is located on one side of the sliding path of the first slide 4. A second motor 5 is mounted on the top of the first lead screw 6. A bottom support platform 7 is also located on the other side of the first slide 4. During shell welding, the second motor 5, in combination with the first lead screw 6, drives the first slide 4 to move downwards, thus... The bottom support platform 7 is lowered to facilitate placing the shell to be welded on the bottom support platform 7. Then, the first slide 4 is driven to move upward so that the central axis of the shell to be welded coincides with the rotation center of the rotary table 2. This allows the shell to be welded to rotate left and right along its rotation center when the first motor 3 drives the rotary table 2 to rotate. This ensures that the weld seam of the "saddle opening" to be welded is always in a flat welding position (by controlling the left and right rotation of the shell to be welded, the weld point of the "saddle opening" to be welded is transformed from curved space to planar space, so that the weld point is kept on the same horizontal plane for welding). This reduces the welding difficulty and improves the weld quality.

[0026] Furthermore, the base support platform 7 is equipped with a second lead screw 710. The threads of the second lead screw 710 are arranged in opposite directions with its center as the boundary. Two sets of second slides 720 are provided on the two sets of threads in opposite directions. At the same time, the two sets of second slides 720 are provided with opposing support platforms 8. When the shell to be welded is placed on the base support platform 7, the support platforms 8 are driven to move in opposite directions in advance by the combination of the second lead screw 710 and the second slides 720, and the distance between the two is adjusted to clamp and support the shell to be welded, so as to maintain the stability of the shell to be welded.

[0027] This embodiment also includes an annular guide rail 16 arranged above the pipe to be welded in the shell. The annular guide rail 16 has two sets of annular slides 17 circumferentially mounted, each capable of moving around the guide rail 16. Each annular slide 17 has a clamping assembly. Simultaneously, a drive arm 18 is fixedly connected to each of the two annular slides 17. The two drive arms 18 are coaxial around the annular guide rail 16 and can rotate circumferentially along the guide rail 16 via a drive component. This causes the drive arms 18 to push the clamping assemblies on the annular slides 17 to rotate. By utilizing the different states formed by the two sets of clamping assemblies, different clamping constraints are applied to the pipe to be welded in the shell during welding. Specifically: ①For example Figure 13 As shown in the state diagram, when welding a large "saddle-shaped" weld, it is necessary to perform multi-point welding around the circumference of the "saddle-shaped" weld to assemble and fix the main pipe and branch pipe of the shell (to constrain the relative position of the pipes and the bevel gap, and suppress misalignment, offset and initial deformation during welding). Therefore, before welding the pipe to be welded in the shell, the drive component pushes one set of drive arms 18 away from the other set to rotate, so that the two sets of clamping components clamp the pipe to be welded in a symmetrical state, so as to maintain the verticality of the multi-point positioning welding of the pipe to be welded (such as welding four welding points around the circumference of the "saddle-shaped" weld, which can assemble and fix the main pipe and branch pipe of the shell, and at the same time, can evenly divide the "saddle-shaped" weld, preparing for subsequent symmetrical welding).

[0028] ②For example Figure 14 As shown in the state change diagrams (a), (b), (c), and (d), after the "saddle-shaped" weld seam is multi-point tack welded, the driving component first drives one set of driving arms 18 to rotate and approach the other set, so that the two sets of clamping components form an angle between them. The welding point is between the angles. Then, when the welding torch welds the "saddle-shaped" weld seam (the initial welding point of the welding torch moves along the welding point), the driving component pushes the two sets of driving arms 18 to rotate synchronously, so that the two sets of clamping components move synchronously along the welding path, constraining the welding deformation of the welded and unwelded parts of the pipe, so as to maintain the verticality of the pipe to be welded. The specific welding path is as follows: When the "saddle-mouth" weld is divided into four welding areas by four welding points, the A section in the state change diagram (a) can be welded first. During this process, the two sets of clamping components move synchronously with the welding torch welding path to constrain the deformation of the pipes on both sides of the welding point. Then, the B section in the opposite side of the state change diagram (b) is welded. During this process, the two sets of clamping components move synchronously to the B section in the state change diagram (b) and move synchronously with the welding torch welding path. Then, following this pattern, the C section in the state change diagram (c) and the D section in the state change diagram (d) are welded in sequence. By performing segmented symmetrical welding and constraining the deformation of the pipes in real time, the symmetrical welding of the "saddle-mouth" weld is completed, so as to avoid the situation where continuous welding on a single side causes the stress and "pulling" force of the unwelded parts to gradually increase.

[0029] In addition to the above, an electric rod 10 is also installed on the first slide table 4. The telescopic end of the electric rod 10 is provided with a support arm 9. The other end of the support arm 9 is provided with a third motor 11 composed of driving components. Below the third motor 11, a support cylinder 12 is installed and fixedly connected to the annular guide rail 16. When the housing is placed on the bottom support platform 7, the electric rod 10 can be driven to retract synchronously. The annular guide rail 16 is driven to move down through the support arm 9, driving the two sets of clamping components to clamp the housing onto the pipe to be welded, clamping and positioning the "saddle-shaped" weld seam, and preparing for the subsequent multi-point positioning welding and symmetrical welding of the "saddle-shaped" weld seam.

[0030] like Figures 6-12 As shown, to achieve the circumferential movement of the two sets of clamping components around the "saddle-shaped" weld, two sets of spline grooves 1810 are also included, each located coaxially at one of the two sets of drive arms 18. A drive shaft 19 is located at the center of each spline groove 1810, and spline teeth 20 are located at the bottom end of the drive shaft 19. The spline teeth 20 can sequentially mesh with the two sets of spline grooves 1810. The upper half of the drive shaft 19 has a rhomboid shaft structure, and the output end of the third motor 11 is slidably connected to the rhomboid shaft structure. This ensures that during the lifting and lowering movement of the drive shaft 19, the third motor 11 always maintains rotational drive on the drive shaft 19. By controlling the lifting and lowering of the drive shaft 19, the spline teeth 20 sequentially mesh with the spline grooves 1810. When the spline teeth 20 mesh with a set of spline grooves 1810, the third motor 11 drives the rotation of the drive shaft 19, driving a set of drive arms 18 to rotate. This can push one set of clamping components away from the other set, forming a symmetrical clamping state of the pipe to be welded, or push one set of clamping components closer to the other set, forming a state of clamping the two sides of the weld point of the pipe to be welded at an angle. When the spline teeth 20 mesh with the two sets of spline grooves 1810, the third motor 11 drives the rotation of the drive shaft 19, driving the two sets of drive arms 18 to rotate synchronously, so that the two sets of clamping components move synchronously along the weld point, dynamically constraining the pipe on both sides of the weld point and reducing the deformation of the pipe during the welding process.

[0031] As a further embodiment, a second groove 23 is provided inside the support cylinder 12, and a third groove 24 is provided below the second groove 23 (both the second groove 23 and the third groove 24 are annular grooves). Simultaneously, a fixing sleeve 21 is axially provided on the drive shaft 19, and a first spring 22 is sleeved above the fixing sleeve 21 (the other end of the first spring 22 is rotatably mounted on the support cylinder 12 to rotate synchronously with the drive shaft 19; the elastic force of the first spring 22 is used to push the drive shaft 19 to maintain its position). (With a downward trend), a second sliding post 2110 is also provided on one side of the fixed sleeve 21. The second sliding post 2110 can slide along the second sliding groove 23 and the third sliding groove 24. An opening groove 25 is opened on the track path of the second sliding groove 23 to guide the second sliding post 2110 to slide from the second sliding groove 23 to the third sliding groove 24, so that the spline teeth 20 mesh with the two sets of spline grooves 1810. When driving one set of clamping components to move away from the other set, the third motor 11 can push the drive shaft 19 counterclockwise. During the rotation, the drive shaft 19 drives the second sliding column 2110 to slide counterclockwise along the second sliding groove 23, so that the spline teeth 20 only mesh with one set of spline grooves 1810, pushing one set of drive arms 18 to rotate (the other set of drive arms 18 is not under force and remains stationary). When driving the two sets of clamping components to move synchronously, the third motor 11 pushes the drive shaft 19 to rotate clockwise, causing the previously opposing drive arms 18 to rotate closer to the other set, thus causing the corresponding clamping components to rotate closer to the other set. During this process, the drive shaft 19 drives the second sliding column 2110 to slide clockwise along the second sliding groove 23 until it slides to the opening groove 25. Under the force of the first spring 22, the second sliding column 2110 is pushed down to transition into the third sliding groove 24, and at the same time, the spline teeth 20 are pushed down to mesh with the two sets of spline grooves 1810, which pushes the two sets of drive arms 18 to rotate synchronously. This allows the two sets of clamping components to form an angled state while also driving the two sets of clamping components to move circumferentially around the "saddle mouth" weld.

[0032] Furthermore, a sway guide plate 26 is provided on the opening path of the opening slot 25 to guide the second sliding column 2110 to slide between the second sliding groove 23 and the third sliding groove 24. The sway guide plate 26 also has a sway shaft 2610 at its rotating end, and a torsion spring 2620 at one end of the sway shaft 2610. This causes the second sliding column 2110 to sway and give way when it slides along the third sliding groove 24 and passes the sway guide plate 26. During the welding of the "saddle-shaped" weld, the third motor 11 can drive the drive shaft 19 to rotate continuously clockwise. During this process, the second sliding column 2110 always slides along the third sliding groove 24, providing stable meshing between the spline teeth 20 and the two sets of spline grooves 1810. Furthermore, when the second sliding column 2110 passes the sway guide plate 26... When the second slide column 2110 is guided along the third slide groove 24, the sway guide plate 26 can be pushed to sway and move to maintain the guiding motion of the second slide column 2110. After the subsequent "saddle mouth" weld is completed, when it is necessary to form a symmetrical state between the two sets of clamping components, the third motor 11 can drive the drive shaft 19 to rotate counterclockwise. When the second slide column 2110 passes through the sway guide plate 26, it is guided by the sway guide plate 26 from the third slide groove 24 into the second slide groove 23, which pushes the drive shaft 19 to move upward, so that the spline teeth 20 move upward and only maintain meshing with one set of spline grooves 1810. Then, through the continuous counterclockwise rotation of the drive shaft 19, one set of clamping components is pushed away from the other set to move, forming a symmetrical state again, in preparation for the subsequent shell welding.

[0033] like Figures 5-6As shown, the clamping assembly includes a first groove 1210 circumferentially formed around the support cylinder 12 and a first support 13 fixed to the annular slide table 17. Two sets of first lifting rods 14 are slidably mounted on the first support 13, and first clamping wheels 15 are provided at the bottom of the first lifting rods 14. The two sets of first clamping wheels 15 clamp the inner and outer walls of the pipe to be welded. A first sliding column 1410 is provided at the top of the first lifting rods 14. The first sliding column 1410 can slide along the first groove 1210. The track path of the first groove 1210 is the same as the weld path ("saddle-mouth" weld) of the pipe to be welded. When the first sliding column 1410 slides along the first groove 1210, it guides the first clamping wheels 15 to travel along the welding path of the pipe to be welded. During the process of driving the annular slide table 17 to move circumferentially around the "saddle-mouth" weld, The first sliding column 1410 moves synchronously along the first sliding groove 1210. Since the track path of the first sliding groove 1210 is the same as the welding path of the "saddle-mouth" weld, the first lifting rod 14 drives the first clamping wheel 15 to move synchronously along the path of the "saddle-mouth" weld, so that the first clamping wheel 15 is always located on the pipe to be welded at the "saddle-mouth" weld. By using the synchronous clamping movement of the two relative first clamping wheels 15 along the "saddle-mouth" weld, the pipe on both sides of the weld point is clamped and constrained. On the one hand, this reduces the continuous transmission and diffusion of the "pulling" deformation force to the unwelded part, and on the other hand, it reduces the stress shrinkage deformation of the welded part. It passively constrains the stress and shrinkage deformation of the welded part of the pipe to be welded. Through the forced constraint "shaping" of the pipe to be welded, it is suitable for welding work of pipe shells with thicker shells.

[0034] Example 2, as Figures 15-17As shown, unlike Embodiment 1, the clamping assembly also includes a second support 27 fixedly connected to the annular slide 17. A fixing rod 31 is fixedly connected to one side of the second support 27, and an arc-shaped clamping block 32 is provided at the bottom end of the fixing rod 31. The arc-shaped clamping block 32 clamps the inner wall of the pipe to be welded (the length of the arc-shaped clamping block 32 is greater than the distance between the top and bottom ends of the "saddle-shaped" weld, so that the arc-shaped clamping block 32 always supports the inner wall of the pipe to be welded during its circumferential movement along the "saddle-shaped" weld). The other side of the second support 27 slides... Equipped with a second lifting rod 28, the second lifting rod 28 has a second clamping wheel 29 at its bottom end. The second clamping wheel 29 clamps the outer wall of the pipe to be welded. The second lifting rod 28 is also axially fitted with a second spring 30, which drives the second clamping wheel 29 to move toward the weld seam of the pipe to be welded. During the circumferential movement of the driving annular slide table 17 around the "saddle-mouth" weld seam, the second lifting rod 28, under the elastic force of the second spring 30, drives the second clamping wheel 29 to always be in contact with the main shell (the connection between the main shell and the branch pipe is the "saddle-mouth" weld seam, so that when the second clamping wheel 29 moves along the main shell, it always clamps the branch pipe at the "saddle-mouth" weld seam). This ensures that when the second clamping wheel 29 moves around the "saddle-mouth" weld seam, it is always on the pipe at the "saddle-mouth" weld seam, forming a state of opposing clamping with the arc-shaped clamping block 32, thus constraining the stress and shrinkage deformation of the welding part of the pipe to be welded.

[0035] In this embodiment, the clamping assembly further includes a fourth sliding groove 3110 formed on the fixed rod 31. The fourth sliding groove 3110 has an inclined groove structure. Meanwhile, a rotating seat 2810 is rotatably mounted on the second support 27, and the rotating seat 2810 slidably supports the second lifting rod 28. Furthermore, a third sliding post 2830 is provided at the top of the second lifting rod 28, and an elastic piece 2820 is provided between the third sliding post 2830 and the second lifting rod 28. The third sliding post 2830 is located on the track path of the fourth sliding groove 3110, and is used to apply deflection to the second lifting rod 28. The thrust causes the second clamping wheel 29 to move along the weld seam of the pipe to be welded, applying static pressure to the pipe. Due to the difference in welding deformation intensity between the bottom end (held by both the main pipe and branch pipe of the shell, with strong steel structure constraint, closed bottom recessed space, slow heat dissipation, long high-temperature residence time, and the concentrated pull effect of the welded section at the bottom end) and the top end (less restraint, larger open space, faster heat dissipation, free expansion and contraction, and smaller macroscopic deformation), the welding deformation at the top end is lighter than that at the bottom end, especially on thinner pipe walls. More obviously, as the second clamping wheel 29 moves from the top to the bottom of the "saddle-shaped" weld, the second lifting rod 28 drives the third sliding column 2830 to slide synchronously from top to bottom along the fourth sliding groove 3110. The horizontal force on the third sliding column 2830 as it slides along the fourth sliding groove 3110 gradually increases, and is transmitted to the second lifting rod 28 through the elastic plate 2820, pushing the second lifting rod 28 to swing about the rotating seat 2810 as the fulcrum. This causes the second clamping wheel 29 to move from the top to the bottom of the "saddle-shaped" weld, with the relative position of the arc-shaped clamping block 32... Under the internal support, the static pressure on the pipes to be welded on both sides of the weld point gradually increases. By actively applying pressure to constrain the deformation of the shell pipe during welding, it is suitable for welding of thinner pipe shells (when the pipe is thinner, its deformation constraint resistance is smaller. The combination of the second spring 30 and the second lifting rod 28 can overcome its deformation resistance, so that the second clamping wheel 29 always moves along the circumference of the "saddle mouth" weld. In addition, when the pipe is thinner, the deformation from the top to the bottom of the "saddle mouth" weld is more obvious. By actively applying pressure, its deformation can be more effectively constrained).

[0036] It should be noted that the fixing rod 31 and the third sliding column 2830 are made of magnetic material, so that the fixing rod 31 and the third sliding column 2830 are magnetically connected. By using the magnetic connection between the third sliding column 2830 and the fixing rod 31, the second clamping wheel 29 and the arc-shaped clamping block 32 can still maintain the clamping state when the pipe is no longer clamped, thus preventing the third sliding column 2830 from detaching from the fourth sliding groove 3110 and causing the second clamping wheel 29 to swing left and right.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rotating platform for welding circumferential weld seams of a shell, comprising a rotating table (2) and a bottom support platform (7) located on one side of the rotation path of the rotating table (2), wherein the bottom support platform (7) drives the shell to rise and fall, so that the central axis of the shell coincides with the rotation center of the rotating table (2), characterized in that, Also includes: The annular guide rail (16) is arranged above the pipe to be welded in the shell. The annular guide rail (16) is provided with two sets of annular slides (17) that can move around the annular guide rail (16) in the circumferential direction. Each set of annular slides (17) is provided with clamping components. In the initial state, the two sets of clamping components clamp the pipe to be welded in a symmetrical state to maintain the verticality of the multi-point positioning welding of the pipe to be welded. Two sets of drive arms (18) are fixed to the annular slide (17). The two sets of drive arms (18) are coaxial around the annular guide rail (16). The two sets of drive arms (18) can rotate circumferentially along the annular guide rail (16) through the drive components, so that the drive arms (18) push the clamping components on the annular slide (17) to rotate. After the pipe to be welded is multi-point tack welded, one set of drive arms (18) is first pushed to rotate, so that the two sets of clamping components form an angle between them, and the welding point is between the angles. Then, the two sets of drive arms (18) are pushed to rotate synchronously, so that the two sets of clamping components move along the weld seam of the pipe to be welded, constraining the welding deformation of the welded and unwelded parts, so as to maintain the verticality of the pipe to be welded. It also includes a support cylinder (12), which is fixed above the annular guide rail (16); The clamping assembly includes: The first groove (1210) is circumferentially opened around the support cylinder (12); The first support (13) is fixedly connected to the annular slide (17). Two sets of first lifting rods (14) are slidably installed on the first support (13), and a first clamping wheel (15) is provided at the bottom end of the first lifting rod (14). The two sets of first clamping wheels (15) clamp the inner and outer walls of the pipe to be welded. The first lifting rod (14) has a first sliding column (1410) at its top end, and the first sliding column (1410) can slide along the first sliding groove (1210); The track path of the first chute (1210) is the same as the weld path of the pipe to be welded, so that when the first slide column (1410) slides along the first chute (1210), it guides the first clamping wheel (15) to travel along the welding path of the pipe to be welded.

2. The rotating platform for welding circumferential weld seams of a shell according to claim 1, characterized in that, Also includes: Spline grooves (1810) are provided in two sets, which are located at the coaxial center of the two sets of drive arms (18); The drive shaft (19) is located at the center of the spline groove (1810). The bottom end of the drive shaft (19) is provided with spline teeth (20), which can mesh with two sets of spline grooves (1810) in sequence.

3. The rotating platform for welding circumferential weld seams of a shell according to claim 2, characterized in that, The support cylinder (12) has a second groove (23) inside, and a third groove (24) is provided below the second groove (23); It also includes a fixed sleeve (21) located in the axial direction of the drive shaft (19), wherein a second sliding column (2110) is provided on one side of the fixed sleeve (21), and the second sliding column (2110) can slide along the second sliding groove (23) and the third sliding groove (24); The second slide groove (23) has an opening groove (25) on its track path, which is used to guide the second slide column (2110) to slide from the second slide groove (23) to the third slide groove (24) so ​​that the spline teeth (20) mesh with the two sets of spline grooves (1810).

4. The rotating platform for welding circumferential weld seams of a shell according to claim 3, characterized in that, The opening path of the opening groove (25) is also provided with a deflecting guide plate (26) to guide the second sliding column (2110) to slide between the second sliding groove (23) and the third sliding groove (24). The deflecting guide plate (26) is also provided with a deflecting shaft (2610) at the rotating shaft end, and a torsion spring (2620) is provided at one end of the deflecting shaft (2610) so that the second sliding column (2110) deflects and makes way when it slides along the third sliding groove (24) and passes the deflecting guide plate (26).

5. A rotating platform for welding circumferential weld seams of a shell according to claim 4, characterized in that, The clamping assembly further includes: The second support (27) is fixed to the annular slide (17); A fixing rod (31) is fixed to one side of the second support (27), and an arc-shaped clamp (32) is provided at the bottom end of the fixing rod (31). The arc-shaped clamp (32) is clamped to the inner wall of the pipe to be welded. The second lifting rod (28) is slidably installed on the other side of the second support (27). The bottom end of the second lifting rod (28) is provided with a second clamping wheel (29), which clamps the outer wall of the pipe to be welded. The second lifting rod (28) is also axially fitted with a second spring (30), which drives the second clamping wheel (29) to move toward the weld seam of the pipe to be welded.

6. A rotating platform for welding circumferential weld seams of a shell according to claim 5, characterized in that, The clamping assembly further includes: The fourth slide (3110) is provided on the fixed rod (31), and the fourth slide (3110) is a sloping groove structure; The rotating seat (2810) is rotatably mounted on the second support (27), and the rotating seat (2810) slides to support the second lifting rod (28). The third sliding column (2830) is located at the top of the second lifting rod (28), and an elastic piece (2820) is provided between the third sliding column (2830) and the second lifting rod (28). The third sliding column (2830) is located on the track path of the fourth sliding groove (3110) and is used to apply a swaying thrust to the second lifting rod (28) so that the second clamping wheel (29) can apply static pressure to the pipe to be welded during the movement of the second clamping wheel (29) along the weld seam of the pipe to be welded.

7. A rotating platform for welding circumferential weld seams of a shell according to claim 6, characterized in that, The fixing rod (31) and the third sliding column (2830) are made of magnetic material, so that the fixing rod (31) and the third sliding column (2830) are magnetically connected.

8. A rotating platform for welding circumferential weld seams of a shell according to claim 7, characterized in that, The upper part of the drive shaft (19) is a rhomboid shaft structure; The driving component includes a third motor (11) located above the support cylinder (12), and the output end of the third motor (11) is slidably connected to the rhomboid shaft structure.

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