A furnace shell welding apparatus

Abstract

This invention relates to the technical field of furnace body welding, and mainly discloses a furnace shell welding device, which includes a support, including a base plate and adjusting frames fixed at both ends thereon, with a rotating rod fixed between the adjusting frames; a fixing component, including a movable push seat, an outer support component, and a pushing component, wherein the movable push seat is symmetrically and movably disposed on the base plate, and the outer support component and the pushing component are symmetrically disposed on the rotating rod; wherein the outer support component is disposed inside the shell, and the pushing component is disposed at both ends of the shell; and a welding component, including a first welding component and a second welding component, wherein the first welding component is disposed on the adjusting frame, and the second welding component is disposed on the rotating rod and located between the outer support components; this invention solves the problems of large positioning errors and difficulty in completing welding in one operation in existing shell welding equipment.

Description

Technical Field

[0001] This invention relates to the technical field of furnace body welding, and in particular to a furnace shell welding device. Background Technology

[0002] Existing welding equipment for gas-fired industrial furnace shells generally employs a segmented process of "external wall welding first, internal wall welding supplementary welding," requiring multiple hoisting and turning operations, resulting in a lengthy process. The shell and flange are aligned manually using a crane, leading to significant positioning errors and frequent defects such as incomplete fusion and undercut at the root of the circumferential weld. Pre-welding cleaning of oxide scale and oil stains on the bevel relies on manual removal, leaving residual impurities that cause frequent porosity and slag inclusions. Furthermore, the narrow internal space of large shells limits the reach of traditional robotic arms, making it difficult to complete the internal wall root welding in one pass; secondary heat input can easily induce deformation and delayed cracking. Localized heat treatment can only relieve some stress and cannot guarantee long-term safe operation. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that the existing shell welding equipment has a large positioning error and is difficult to complete the welding in one go.

[0004] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a furnace shell welding device, which includes a support, a base plate, and adjusting frames fixed at both ends thereon. A rotating rod, driven by a fourth motor, is provided between the adjusting frames to drive the furnace shell to rotate circumferentially. Fixing members are symmetrically arranged on the rotating rod, and each fixing member includes: a movable push base symmetrically and movably disposed on the base plate; a pushing member disposed on the rotating rod and connected to the movable push base, used to clamp and limit the furnace shell from both ends; and an external support member disposed on the furnace shell. Inside the furnace, the external support includes a linkage mechanism formed by hinged first and second support rods; wherein, when the movable pusher moves towards each other, the pushing member clamps the furnace shell and simultaneously drives the linkage mechanism to open, so that the external support provides external support to the inner wall of the furnace shell from the inside; the welded parts include: a first welded part, disposed on the adjusting frame, used to weld the external weld of the furnace shell when the furnace shell rotates circumferentially; and a second welded part, disposed on the rotating rod and located between the external support parts, used to weld the internal weld of the furnace shell.

[0005] In a preferred embodiment of the furnace shell welding equipment of the present invention: the base plate is symmetrically provided with slide rails and a first lead screw driven by a first motor; the movable push seat is slidably disposed on the slide rails and threadedly engaged with the first lead screw to realize the opposite or opposite movement of the movable push seat.

[0006] In a preferred embodiment of the furnace shell welding equipment of the present invention: a bridge is fixedly connected between the tops of the adjusting frame, the first weldment is slidably disposed on the bridge, and driven by a third lead screw driven by a third motor to realize the axial movement welding along the furnace shell.

[0007] In a preferred embodiment of the furnace shell welding equipment of the present invention, an auxiliary support plate is further provided on the bottom plate, and the auxiliary support plate is provided with rollers for supporting the bottom of the furnace shell.

[0008] In a preferred embodiment of the furnace shell welding equipment of the present invention: the auxiliary support plate is rotatably connected to the base plate by a hinge and is provided with a buffer mechanism to provide buffering when the auxiliary support plate rotates.

[0009] In a preferred embodiment of the furnace shell welding equipment of the present invention: the adjusting frame is provided with a lifting block driven by a second lead screw that can be driven by a second motor; the rotating rod is rotatably disposed between the lifting blocks on both sides to realize the overall lifting or lowering of the furnace shell.

[0010] In a preferred embodiment of the furnace shell welding equipment of the present invention: the pushing member includes a connecting plate connected to the movable pushing seat and a pushing plate for abutting the end of the furnace shell; the pushing plate is connected to the connecting plate through a fourth screw to adjust the pressing stroke.

[0011] In a preferred embodiment of the furnace shell welding equipment of the present invention: the pushing member is provided with a rotatable rotating sleeve, and the first support rod in the outer support member is hinged to the rotating sleeve; the rotating rod is provided with a mounting plate, and the second support rod in the outer support member is hinged to the mounting plate.

[0012] In a preferred embodiment of the furnace shell welding equipment of the present invention: the rotating sleeve of the pushing member is rotatably sleeved on the connecting plate through a bearing, so that the outer support member can rotate synchronously with the furnace shell.

[0013] In a preferred embodiment of the furnace shell welding equipment of the present invention: the second weldment includes a rotating disk that can be driven by a fifth motor and a second welding head fixed on the rotating disk. The rotation of the rotating disk can drive the second welding head to adjust its radial position.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention achieves internal and external welding of the shell joint through a first weldment and a second weldment. Simultaneous welding or time-sharing welding can be selected, which improves the welding flexibility. Furthermore, the shell is supported by an external support member, and the rotating rod can drive the shell to rotate circumferentially, realizing circumferential rotational welding of the welding heads of the first and second weldments to the shell, avoiding the manpower consumption caused by manual handling.

[0016] The movable pusher and the pusher can clamp and limit the housing from both sides, and can appropriately adjust the clamping tightness according to the housing of different lengths to ensure that the two housings to be welded always remain in close contact, avoiding excessive weld size and low weld strength due to excessive distance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0018] Figure 1 The overall structural diagram of the furnace shell welding equipment is shown;

[0019] Figure 2 An overall sectional view of the furnace shell welding equipment is shown;

[0020] Figure 3 A structural diagram of the support frame for the furnace shell welding equipment is shown;

[0021] Figure 4 A schematic diagram showing the connection between the buffer rod and the base plate of the furnace shell welding equipment is shown.

[0022] Figure 5 A structural diagram of the adjustment frame for the furnace shell welding equipment is shown;

[0023] Figure 6 A structural diagram of the movable pusher of the furnace shell welding equipment is shown;

[0024] Figure 7 A schematic diagram of the installation of the external support and pushing parts of the furnace shell welding equipment is shown;

[0025] Figure 8 A schematic diagram of the installation of the second weldment in the furnace shell welding equipment is shown. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary depending on the intent, precedent, or new technology of those skilled in the art. Therefore, the terminology used in this specification should not be construed as simple names, but rather as based on the meaning of the terms and the overall description of the invention.

[0028] Reference Figures 1 to 8This embodiment provides a furnace shell welding device, which includes a support 1, a base plate 11 and an adjustment frame 12 fixed at both ends thereon, and a rotating rod 13 fixed between the adjustment frames 12.

[0029] The support 1 is preferably made of carbon structural steel. The adjustment frame 12 is welded and fixed to the top of the base plate 11. The base plate 11 is fixed to the ground by bolts. The two ends of the rotating rod 13 are respectively rotatably installed between the adjustment frame 12. In this embodiment, the rotating rod 13 is composed of two solid carbon steel rods connected by threads or bolts. Its support rigidity meets the requirements for supporting the welded pipe.

[0030] The fixing component 2 includes a movable push base 21, an outer support component 22, and a pushing component 23. The movable push base 21 is symmetrically and movably disposed on the base plate 11. The outer support component 22 and the pushing component 23 are symmetrically disposed on the rotating rod 13. The outer support component 22 is disposed inside the housing, and the pushing component 23 is disposed at both ends of the housing.

[0031] The movable push base 21 is symmetrically mounted on the base plate 11. Driven synchronously by a motor, it can move along the axis of the base plate 11. The push member 23 can move synchronously with the movable push base 21 to clamp and fix the cylindrical shell in the middle.

[0032] Furthermore, as the movable push base 21 slides, the outer support 22 can provide internal support for welded pipe shells with different inner diameters, and as the rotating rod 13 rotates, the welded pipe shell can rotate synchronously in the circumferential direction.

[0033] The welded component 3 includes a first welded component 31 and a second welded component 32. The first welded component 31 is disposed on the adjusting frame 12, and the second welded component 32 is disposed on the rotating rod 13 and located between the outer support components 22.

[0034] During use, the pusher 23 presses the two welded pipe shells that need to be joined together in the horizontal direction, so that the parts that need to be welded fit tightly together. Then, the rotating rod 13 is driven by the motor to rotate, which in turn drives the two welded pipe shells to rotate slowly. It should be noted that the rotation speed of the welded pipe shells is extremely slow, and the welding point will not break due to the shaking caused by the rotation of the welded pipe shells.

[0035] Furthermore, after the welded pipe shell rotates one revolution, the first welding component 31 completes the welding of the outside of the welded pipe shell. At this point, the second welding component 32 starts and actively rotates circumferentially inside the welded pipe to achieve the welding of the inside of the welded pipe. It should be noted that, if necessary, the second welding component 32 can also start synchronously during the welding process of the first welding component 31 to cooperate with the first welding component 31 to achieve the welding of the inside and outside of the welded pipe.

[0036] Slide rails 111 are symmetrically fixedly connected to the base plate 11. Preferably, two slide rails 111 are provided and installed side by side on the base plate 11. A first lead screw 112 is symmetrically connected between the slide rails 111. One end of the first lead screw 112 is rotatably connected to the mounting block 1121, and the other end is fixedly connected to the shaft of the first motor 1122.

[0037] A bridge frame 121 is fixedly connected between the tops of the adjustment frame 12, and the first weldment 31 is slidably fixed inside the bridge frame 121.

[0038] Auxiliary support plates 113 are symmetrically rotatably connected to the base plates 11 on both sides of the slide rail 111. The auxiliary support plates 113 include a support plate body 1131, a connecting cylinder 1132 and a roller 1133. The connecting cylinder 1132 is fixedly connected to one side of the support plate body 1131, and the roller 1133 is rotatably connected to the other side of the support plate body 1131.

[0039] A hinge 114 is fixedly connected to the base plate 11. The connecting cylinder 1132 is rotatably inserted into the hinge 114 and fixed by the insertion rod 1141.

[0040] A buffer rod 1134 is also hinged to the bottom end of the support plate 1131. A buffer groove 11341 is provided on the bottom plate 11. A buffer block 11342 is slidably connected in the buffer groove 11341. The other end of the buffer rod 1134 is hinged to the top of the buffer block 11342. A first spring T1 is also connected between the buffer block 11342 and the groove wall of the buffer groove 11341.

[0041] During use, the idle auxiliary support plate 113 is supported upward by the first spring T1. It should be noted that in order to ensure the support strength, multiple sets of buffer grooves 11341 and corresponding buffer rods 1134 and the first spring T1 can be provided.

[0042] Furthermore, when welding the shell, the two welded pipe shells are placed on the raised auxiliary support plate 113. The welded pipe shells can rotate freely on the roller 1133. The auxiliary support plate 113 supporting the welded pipe shells descends under gravity, and the first spring T1 contracts under force. During the rotation of the welded pipe shells, the first spring T1 can alleviate the vibration caused by the rotation and prevent the weld point from breaking.

[0043] An extension plate 122 is fixedly connected to the side wall of the adjustment frame 12. A second motor 1221 is fixedly connected to the top of the extension plate 122. A second lead screw 1222 is fixedly connected to the shaft of the second motor 1221. The other end of the second lead screw 1222 is rotatably inserted into the bottom plate 11.

[0044] The adjusting frame 12 is also slidably connected to a lifting block 123, and the second lead screw 1222 is threaded into the lifting block 123.

[0045] The top of both ends of the cable tray 121 are symmetrically fixed with upright plates 1211. A third lead screw 1212 is rotatably inserted between the upright plates 1211. The third lead screw 1212 is threaded into the first weldment 31. One end of the third lead screw 1212 is fixed to the shaft of the third motor 1213.

[0046] During use, after the third motor 1213 is started, it can drive the first weldment 31 to move laterally, which makes it easier to change the welding point of the first weldment 31.

[0047] The rotating rod 13 is rotatably inserted between the two lifting blocks 123. The fourth motor 1232 is fixedly connected to the outer wall of the lifting block 123 near the second lead screw 1222. The rotating rod 13 is connected and fixed to the shaft of the fourth motor 1232.

[0048] During use, the second motors 1221 on both sides start, the second lead screw 1222 rotates, and the lifting block 123 can move up and down as the second lead screw 1222 rotates in both directions.

[0049] Furthermore, after the welded pipe shell is placed on the support plate 113, the segmented rotating rod 13 passes through the welded pipe shell and is then spliced ​​together. The spliced ​​rotating rod 13 is then installed and fixed with the rotating shafts of the fourth motors 1232 on both sides. As the lifting block 123 moves up and down, the rotating rod 13 can also change its height accordingly.

[0050] The movable push base 21 includes a base 211, a platform 212, and a floating rod 213. The base 211 is symmetrically slidably connected to the slide rail 111. The first lead screw 112 is threaded into the base 211. After the first motor 1122 is started, the moving position of the movable push base 21 is controlled by controlling the forward and reverse rotation of the first lead screw 112.

[0051] The base 212 is fixedly connected to the top of the base 211. Grooves 2121 are provided on the outer walls of its opposite sides. The floating rod 213 is slidably inserted into the base 212. A sleeve 2122 is fixedly connected to its top. The rotating rod 13 is rotatably inserted into the sleeve 2122.

[0052] A stabilizing plate 21221 is symmetrically fixed at the bottom of the sleeve 2122, and the stabilizing plate 21221 is slidably inserted into the groove 2121.

[0053] During use, the sleeve 2122 can float up and down as the height of the rotating rod 13 changes. During the floating process, the stabilizing plate 21221 can maintain the stability of the sleeve 2122.

[0054] The pusher 23 includes a connecting plate 231, a floating frame 232, a pusher rod 233, and a rotating sleeve 234. The connecting plate 231 is slidably sleeved on the outside of the rotating rod 13 and is fixedly connected to the sleeve 2122.

[0055] A sliding sleeve 2311 is fixedly connected to the middle of the connecting plate 231. A bearing 2312 is rotatably sleeved on the outside of the sliding sleeve 2311. A rotating sleeve 234 is rotatably sleeved on the outside of the bearing 2312. Several sets of first hinge blocks 2341 are circumferentially fixed at the end away from the sliding sleeve 2311.

[0056] The connecting plate 231 is fixedly connected to the sleeve 2122 by bolts. The connecting plate 231 and the sleeve 2122 can move laterally outside the rotating rod 13. The rotating sleeve 234 is sleeved on the outside of the rotating rod 13. With the cooperation of the locking groove opened on the outside of the rotating rod 13, it can follow the circumferential rotation of the rotating rod 13 and slide laterally outside the rotating rod 13.

[0057] The floating frame 232 is symmetrically and slidably engaged in the sliding holes 2313 opened at both ends of the connecting plate 231. The push rod 233 includes a support plate 2331, a fourth lead screw 2332 and an anti-deviation plate 2333. The fourth lead screw 2332 is threaded into the floating frame 232, and its end is rotatably inserted into the support plate 2331. The anti-deviation plate 2333 is symmetrically and fixedly connected to the side of the support plate 2331 near the fourth lead screw 2332, and the anti-deviation plate 2333 is also slidably inserted into the floating frame 232.

[0058] During use, the floating frame 232 can finely adjust the clamping height through the gap of the sliding hole 2313, and the extension length of the abutment plate 2331 can be controlled by rotating the fourth screw 2332. The anti-deviation plate 2333 can keep the abutment plate 2331 in a vertical state, ensuring that the abutment plate 2331 can always abut against the edge of the welded pipe shell that needs to be welded.

[0059] It should be noted that the welded pipe shell needs to rotate during the welding process, while the abutment plate 2331 remains fixed. The rotating welded pipe shell will rub against the abutment plate 2331. However, since the welded pipe shell rotates relatively slowly and there may be intermittent rotation, the negative impact of this friction can be ignored.

[0060] A mounting plate 131 is symmetrically fixedly sleeved in the middle of the rotating rod 13. Several sets of second hinge blocks 1311 are circumferentially fixed on the side of the mounting plate 131 near the movable push base 21.

[0061] The outer support member 22 includes a first support rod 221, a second support rod 222 and an anti-slip block 223. One end of the first support rod 221 is hinged to the first hinge block 2341 and the other end is hinged to the bottom of the second support rod 222. One end of the second support rod 222 is hinged to the second hinge block 1311 and the other end is hinged to the bottom of the anti-slip block 223.

[0062] During use, the first motor 1122 starts and controls the movement of the push seat 21 by rotating the first lead screw 112. When the outer support member 22 is needed to support the inner wall of the welded pipe shell, the two push seats 21 move closer to each other. At this time, the first support rod 221 pushes the second support rod 222 upward, causing the anti-slip block 223 to abut against the inner wall of the welded pipe shell. In this embodiment, four sets of outer support members 22 are preferably provided so that the supporting force on the inner wall of the welded pipe shell is more balanced.

[0063] The second welding component 32 includes a rotating disk 321, a welding assembly 322, and a fifth motor 323. The fifth motor 323 is fixedly connected to a mounting disk 131 on one side. The fifth motors 323 are fixed together by a connecting clamp 3231, which is fixedly sleeved on the rotating rod 13.

[0064] The rotating disk 321 is rotatably sleeved on the rotating rod 13, and a first gear 3211 is fixedly connected to the middle of the side of the rotating disk 321 near the fifth motor 323. The first gear 3211 meshes with the second gear 3232 on the rotating shaft of the fifth motor 323.

[0065] During use, the fifth motor 323 and the second welding component 32, which are in standby mode, will rotate along with the installation plate 131. When the second welding component 32 is required to weld the inner wall of the welding pipe shell, the fifth motor 323 starts and drives the rotating plate 321 to rotate as a whole. At this time, the welding point of the welding component 322 will rotate in a circular direction to further weld the internal welding point.

[0066] The welding assembly 322 is fixedly connected to the side of the rotating disk 321 away from the fifth motor 323. The welding assembly 322 includes a mounting base 3221, a cylinder 3222, a push plate 3223, and a second welding head 3224. The mounting base 3221 is fixedly connected to the rotating disk 321, and the cylinder 3222 is fixedly connected to the side wall of the mounting base 3221. The piston rod of the cylinder 3222 is fixed to the second welding head 3224 through the push plate 3223. The second welding head 3224 is slidably inserted into the mounting base 3221. The second welding head 3224 and the first welding head 311 on the first weldment 31 are on the same plane.

[0067] During use, after the cylinder 3222 is started, the piston rod can adjust the extension length of the second welding head 3224 according to the different inner diameters of the welded pipe shell, ensuring that the second welding head 3224 is always at the optimal welding distance from the weld seam on the inner wall of the shell, thus avoiding unsatisfactory welding results.

[0068] In summary, this invention simplifies the cumbersome process of "multiple hoisting and repeated alignment" into a smooth operation of "one clamping and continuous welding." In existing technologies, workers rely on large equipment such as overhead cranes, performing multiple hoisting, flipping, visual calibration, and temporary fixing processes to complete welding of different parts of a furnace shell. This process is intermittent, tedious, and heavily dependent on the worker's experience and physical strength. This invention, through its adaptive clamping device, automatically completes centering and clamping the furnace shell the moment it is placed on the worktable, eliminating the need for repeated manual adjustments. More importantly, the integrated rotating mechanism allows the furnace shell to rotate smoothly and precisely to any required welding angle while firmly fixed. Welders can continuously weld from the most comfortable and easily operable position, completing the entire process in one go.

[0069] Secondly, this invention transforms the "multi-person collaboration, experience-dependent" work mode into a "single-person-led, stable and controllable" standardized production model. Traditional methods require multiple people—crane operators, assemblers, and welders—to work together, and any mishap in any link can affect the final quality. This invention, however, automates the complex positioning and transfer tasks entirely through the equipment itself, greatly reducing the skill requirements for operators. Welders can focus on the welding process itself, rather than spending a lot of energy on workpiece handling and positioning. This frees welding quality from dependence on personnel coordination and experience, achieving stable and reliable standardized production.

[0070] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A furnace shell welding device, characterized in that, include: The support (1) includes a base plate (11) and an adjustment frame (12) fixed at both ends thereon. A rotating rod (13) that can be driven by a fourth motor (1232) is provided between the adjustment frames (12) to drive the furnace shell to rotate circumferentially. Fixing member (2) is symmetrically arranged on the rotating rod (13), and the fixing member (2) includes: The movable push base (21) is symmetrically and movably mounted on the base plate (11); A pusher (23), disposed on the rotating rod (13) and connected to the movable pusher (21), is used to clamp and limit the furnace shell from both ends; and An external support member (22) is provided inside the furnace shell. The external support member (22) includes a linkage mechanism formed by hinged connection of a first support rod (221) and a second support rod (222). When the movable pusher (21) moves towards each other, the pusher (23) clamps the furnace shell and drives the linkage mechanism to open, so that the outer support (22) provides external support to the inner wall of the furnace shell from the inside. Welded component (3), including: The first weldment (31) is provided on the adjustment frame (12) and is used to weld the external weld of the furnace shell when the furnace shell rotates circumferentially; The second weldment (32) is provided on the rotating rod (13) and located between the outer support members (22), and is used to weld the internal weld seams of the furnace shell; The pusher (23) includes a connecting plate (231) connected to the movable pusher (21) and a stop plate (2331) for abutting the end of the furnace shell; the stop plate (2331) is connected to the connecting plate (231) via a fourth screw (2332) to adjust the pressing stroke; The pusher (23) is provided with a rotatable rotating sleeve (234), and the first support rod (221) in the outer support (22) is hinged to the rotating sleeve (234); the rotating rod (13) is provided with a mounting plate (131), and the second support rod (222) in the outer support (22) is hinged to the mounting plate (131); A sliding sleeve (2311) is fixedly connected to the middle of the connecting plate (231). A bearing (2312) is rotatably sleeved on the outside of the sliding sleeve (2311). A rotating sleeve (234) is rotatably sleeved on the outside of the bearing (2312). The rotating sleeve (234) of the pushing member (23) is rotatably sleeved on the sliding sleeve (2311) through the bearing (2312), so that the outer support member (22) can rotate synchronously with the furnace shell.

2. The furnace shell welding equipment according to claim 1, characterized in that: The base plate (11) is symmetrically provided with slide rails (111) and a first lead screw (112) driven by a first motor (1122); the movable push base (21) is slidably provided on the slide rails (111) and threadedly engaged with the first lead screw (112) to realize the opposite or opposite movement of the movable push base (21).

3. The furnace shell welding equipment according to claim 1, characterized in that: A bridge frame (121) is fixedly connected between the tops of the adjustment frame (12). The first weldment (31) is slidably mounted on the bridge frame (121) and driven by the third lead screw (1212) driven by the third motor (1213) to achieve axial welding along the furnace shell.

4. The furnace shell welding equipment according to claim 1, characterized in that: It also includes an auxiliary support plate (113) provided on the base plate (11), and the auxiliary support plate (113) is provided with rollers (1133) for supporting the bottom of the furnace shell.

5. The furnace shell welding equipment according to claim 4, characterized in that: The auxiliary support plate (113) is rotatably connected to the base plate (11) via a hinge (114) and is provided with a buffer mechanism to provide buffering when the auxiliary support plate (113) rotates.

6. The furnace shell welding equipment according to claim 1, characterized in that: The adjusting frame (12) is provided with a lifting block (123) driven by a second lead screw (1222) that can be driven by a second motor (1221); the rotating rod (13) is rotatably disposed between the lifting blocks (123) on both sides to realize the overall lifting or lowering of the furnace shell.

7. The furnace shell welding equipment according to claim 1, characterized in that: The second weldment (32) includes a rotating disk (321) that can be driven by a fifth motor (323) and a second welding head (3224) fixed on the rotating disk (321). The rotation of the rotating disk (321) can drive the second welding head (3224) to adjust its radial position.

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