Stabilizer bar link welding device

CN122807368APending Publication Date: 2026-09-25ZHEJIANG RUITAI SUSPENSION SYST TECH
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Patent Information

Application Number
CN202611173448.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-08-04
Publication Date
2026-09-25

AI Technical Summary

Technical Problem

[0003]现有的焊接设备功能较为单一,仅仅对工件进行夹持固定,在固定后进行焊接

Benefits of technology

[0013]与现有技术相比,本发明的有益效果是:通过设置由夹板、伸缩部组成的上夹持组件与下夹持组件相互配合,不仅可以便捷地对稳定杆以及待焊接零件进行夹持固定,而且在焊接结束后,可以便捷地对其进行拆卸,有效提高焊接效率。

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Abstract

The present application belongs to the technical field of welding tooling, and discloses a stable rod connecting rod welding device, which comprises a fixing ring, a positioning mechanism is arranged outside the fixing ring, the positioning mechanism comprises an upper clamping assembly and a lower clamping assembly, the upper clamping assembly is composed of clamping plates and telescopic parts, the clamping plates are arranged in pairs and are oppositely distributed, clamping holes are respectively arranged in the opposite side walls of the two clamping plates, the lower clamping assembly is located below the fixing ring, the lower clamping assembly is used for fixing the parts to be welded at the bottom end of the stable rod, a strength detection mechanism is arranged on the surface of the fixing ring, and the strength detection mechanism comprises a detection head, a supporting assembly and a driving assembly. Through the cooperation of the supporting assembly and the driving assembly, the multiple detection heads can be controlled to move rapidly intermittently towards the welded parts, the detection heads can impact the welded parts with great force, and the detection heads can impact detect the welding effect of the stable rod and the parts.
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Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, specifically a welding device for a stabilizer bar connecting rod. Background Technology

[0002] Stabilizer bars are common automotive components used to prevent excessive lateral roll during cornering, thus maintaining vehicle balance. The manufacturing process for stabilizer bars is complex, requiring numerous steps. During welding, tooling is typically used to secure the stabilizer bar and its components before welding to ensure precision.

[0003] Existing welding equipment has a relatively simple function, merely clamping and fixing the workpiece before welding. After welding, it is impossible to test the weld strength of the workpiece, resulting in poor overall performance. Summary of the Invention

[0004] The purpose of this invention is to provide a stabilizer bar connecting rod welding device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A stabilizer bar welding device includes a fixed ring. A positioning mechanism is provided on the outer side of the fixed ring. The positioning mechanism includes an upper clamping assembly and a lower clamping assembly. The upper clamping assembly consists of clamping plates and a telescopic part. Two clamping plates are provided and distributed opposite each other. Clamping holes are respectively opened on the opposite side walls of the two clamping plates. The telescopic part is located above the fixed ring and connected to the clamping plates. The telescopic part is used to adjust the relative position between the two clamping plates to fix the stabilizer bar. The lower clamping assembly is located below the fixed ring and is used to fix the part to be welded at the bottom end of the stabilizer bar. A strength detection mechanism is provided on the surface of the fixed ring. The strength detection mechanism includes a detection head, a support assembly, and a drive assembly. Multiple detection heads are provided. The support assembly is located on the inner side wall of the fixed ring and connected to the detection heads. The support assembly is used to control the multiple detection heads to be distributed in a ring with equal spacing in the inner cavity of the fixed ring. The drive assembly is located on the surface of the fixed ring and connected to the support assembly. The drive assembly is used to control the multiple detection heads to move intermittently toward the center of the fixed ring.

[0007] As a further aspect of the present invention: the telescopic part includes a plurality of relatively distributed vertical plates fixedly installed on the upper surface of a fixing ring, a guide rod fixedly installed between two relatively distributed vertical plates, the two ends of the clamping plate being slidably installed on the surface of the guide rod, and a compression spring fixedly installed on the side wall of the vertical plate, the telescopic end of the compression spring being connected to the clamping plate.

[0008] As a further embodiment of the present invention: the lower clamping assembly includes a plurality of vertical rods fixedly installed on the bottom wall of the fixing ring, a base plate fixedly installed at the bottom end of the plurality of vertical rods, a hydraulic cylinder fixedly installed on the surface of the base plate, and a placement plate fixedly installed at the telescopic end of the hydraulic cylinder.

[0009] As a further aspect of the present invention: the support assembly includes a plurality of horizontal cylinders arranged in annular intervals and fixedly installed on the inner sidewall of a fixing ring; a sliding block is slidably installed inside the horizontal cylinder; a connecting rod is fixedly installed on the sidewall of the sliding block; one end of the connecting rod away from the sliding block extends to the outside of the horizontal cylinder and is connected to the detection head; a positioning spring is fixedly installed at one end of the horizontal cylinder away from the detection head; and the extension end of the positioning spring is connected to the sliding block.

[0010] As a further embodiment of the present invention: the driving assembly includes a control ring rotatably mounted on the outer side of a fixed ring, a gear ring fixedly mounted on the outer wall of the control ring, a fixed frame fixedly mounted on the surface of the fixed ring, a motor fixedly mounted on the surface of the fixed frame, a transmission gear plate fixedly mounted on the output shaft of the motor, the transmission gear plate meshing with the gear ring, an annular control cavity formed on the inner side wall of the control ring, a traction cable fixedly mounted on the side wall of the sliding block, the end of the traction cable away from the sliding block extending to the outer side of the fixed ring and fixedly mounted with a control block, the control block being located within the control cavity, the control block being made of magnetic material, and a magnetic sheet fixedly mounted within the control cavity.

[0011] As a further aspect of the present invention: pull rings are fixedly installed on the opposite side walls of the two clamping plates.

[0012] As a further embodiment of the present invention: an annular limiting groove is provided on the outer side of the fixed ring, and a limiting ring is fixedly installed on the inner side wall of the control ring, with the limiting ring rotatably installed in the limiting groove.

[0013] Compared with the prior art, the beneficial effects of the present invention are: by setting the upper clamping assembly, which consists of a clamping plate and a telescopic part, and the lower clamping assembly to cooperate with each other, not only can the stabilizer bar and the parts to be welded be clamped and fixed conveniently, but also can be easily disassembled after welding, thus effectively improving welding efficiency.

[0014] After welding, by setting up the support component and the drive component to work together, multiple detection heads can be controlled to move rapidly and intermittently toward the welded parts. The detection heads can exert a strong impact on the welded parts and can perform impact testing on the welding effect of the stabilizer bar and the parts. This solves the problem that existing welding equipment cannot test the welding strength of the workpiece after welding, resulting in poor overall performance. Attached Figure Description

[0015] Figure 1This is a three-dimensional structural diagram of a stabilizer bar connecting rod welding device provided in an embodiment of the present invention.

[0016] Figure 2 This is a front view structural schematic diagram of a stabilizer bar connecting rod welding device provided in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the fixing ring and its connection structure in a stabilizer bar welding device provided in an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the control ring and its connection structure in a stabilizer bar welding device provided in an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the detection head and its connection structure in a stabilizer bar connecting rod welding device provided in an embodiment of the present invention.

[0020] Figure 6 for Figure 2 A magnified structural diagram of A in the middle.

[0021] Figure 7 This is a schematic diagram of the clamping plate and its connection structure in a stabilizer bar connecting rod welding device provided in an embodiment of the present invention.

[0022] The components are: 1-fixed ring, 2-positioning mechanism, 21-upper clamping assembly, 211-clamping plate, 2111-clamping hole, 212-telescopic part, 2121-vertical plate, 2122-guide rod, 2123-compression spring, 22-lower clamping assembly, 221-vertical rod, 222-base plate, 223-hydraulic cylinder, 224-placement plate, 3-strength testing mechanism, 31-testing head, 32-support assembly, 321-horizontal cylinder, 322-sliding block, 323-connecting rod, 324-positioning spring, 33-drive assembly, 331-control ring, 332-gear ring, 333-fixed frame, 334-motor, 335-transmission gear plate, 336-control cavity, 337-traction cable, 338-control block, 339-magnetic sheet, 4-pull ring, 5-limiting groove, 6-limiting ring. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0024] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0025] like Figure 1 , Figure 2 , Figure 7The diagram shows a structural representation of a stabilizer bar welding device according to an embodiment of the present invention. It includes a fixing ring 1, with a positioning mechanism 2 disposed on the outer side of the fixing ring 1. The positioning mechanism 2 includes an upper clamping assembly 21 and a lower clamping assembly 22. The upper clamping assembly 21 consists of clamping plates 211 and a telescopic part 212. Two clamping plates 211 are provided and distributed opposite each other. Clamping holes 2111 are respectively formed on the opposite side walls of the two clamping plates 211. The telescopic part 212 is located above the fixing ring 1 and connected to the clamping plates 211. The telescopic part 212 is used to adjust the relative position between the two clamping plates 211 to fix the stabilizer bar. The lower clamping assembly 22 is positioned... Below the fixing ring 1, the lower clamping assembly 22 is used to fix the part to be welded at the bottom end of the stabilizing rod. The surface of the fixing ring 1 is provided with a strength detection mechanism 3. The strength detection mechanism 3 includes a detection head 31, a support assembly 32 and a drive assembly 33. Multiple detection heads 31 are provided. The support assembly 32 is located on the inner side wall of the fixing ring 1 and is connected to the detection heads 31. The support assembly 32 is used to control the multiple detection heads 31 to be distributed in a ring with equal spacing in the inner cavity of the fixing ring 1. The drive assembly 33 is located on the surface of the fixing ring 1 and is connected to the support assembly 32. The drive assembly 33 is used to control the multiple detection heads 31 to move intermittently toward the center of the fixing ring 1.

[0026] In use, the telescopic part 212 adjusts the relative position of the two clamping plates 211, allowing the operator to easily place the stabilizing rod into the clamping hole 2111 between the two clamping plates 211. The telescopic part 212 applies a pushing force to the clamping plates 211, allowing the two clamping plates 211 to easily press and fix the stabilizing rod. The lower clamping assembly 22 can easily fix the part to be welded to the bottom end of the stabilizing rod. At this time, the bottom end of the stabilizing rod is in contact with the part to be welded, allowing the operator to easily control the welding machine to perform welding processing. Throughout the welding process, the support assembly 32 positions multiple detection heads 31, which are arranged in a ring around the outside of the part to be welded. The detection heads 31 do not interfere with the entire welding process. After welding is completed, the part is fixed at the bottom of the stabilizer bar. The lower clamping assembly 22 releases the constraint on the part. The drive assembly 33 and the support assembly 32 cooperate to control multiple detection heads 31 to impact the surface of the part welded to the bottom of the stabilizer bar in sequence. The multiple detection heads 31 can perform omnidirectional impact treatment on the part, thereby detecting the welding effect of the part at the bottom of the stabilizer bar. When the welding quality of the part is unqualified, the part will loosen at the bottom of the stabilizer bar or even fall off directly from the bottom of the stabilizer bar when the detection heads 31 impact the part.

[0027] like Figure 1 , Figure 2As shown, in a preferred embodiment of the present invention, the telescopic part 212 includes a plurality of oppositely distributed vertical plates 2121 fixedly installed on the upper surface of the fixing ring 1, a guide rod 2122 fixedly installed between two oppositely distributed vertical plates 2121, the two ends of the clamping plate 211 are respectively slidably installed on the surface of the guide rod 2122, and a compression spring 2123 is fixedly installed on the side wall of the vertical plate 2121, the telescopic end of the compression spring 2123 is connected to the clamping plate 211.

[0028] The clamping plate 211 slides freely on the surface of the guide rod 2122, thereby allowing for convenient adjustment of the relative position of the two clamping plates 211. When installing the stabilizer rod, the two clamping plates 211 are pulled to move in opposite directions, and the stabilizer rod is inserted between the two clamping plates 211. The restriction on the clamping plates 211 is released, and the compression spring 2123 pushes the two clamping plates 211 to move relative to each other. The two clamping plates 211 stably clamp the stabilizer rod in the clamping hole 2111.

[0029] like Figure 1 , Figure 2 As shown, in a preferred embodiment of the present invention, the lower clamping assembly 22 includes a plurality of vertical rods 221 fixedly installed on the bottom wall of the fixing ring 1, a base plate 222 fixedly installed at the bottom end of the plurality of vertical rods 221, a hydraulic cylinder 223 fixedly installed on the surface of the base plate 222, and a placement plate 224 fixedly installed at the telescopic end of the hydraulic cylinder 223.

[0030] After the stabilizer bar is placed on the surface of the clamping plate 211, the placement plate 224 is directly below the stabilizer bar. The part to be welded is placed on the surface of the placement plate 224, and the hydraulic cylinder 223 pushes the placement plate 224 to move vertically upward. The placement plate 224 drives the part to be welded to move upward synchronously. When the part to be welded is in contact with the bottom end of the stabilizer bar, the stabilizer bar and the part can be easily welded.

[0031] like Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, in a preferred embodiment of the present invention, the support assembly 32 includes a plurality of horizontal cylinders 321 arranged in annular intervals and fixedly installed on the inner sidewall of the fixing ring 1. A sliding block 322 is slidably installed inside the horizontal cylinder 321. A connecting rod 323 is fixedly installed on the sidewall of the sliding block 322. One end of the connecting rod 323 away from the sliding block 322 extends to the outside of the horizontal cylinder 321 and is connected to the detection head 31. A positioning spring 324 is fixedly installed inside the horizontal cylinder 321 away from the detection head 31. The telescopic end of the positioning spring 324 is connected to the sliding block 322.

[0032] The fixing ring 1 positions multiple horizontal cylinders 321, the horizontal cylinders 321 position the sliding block 322, the sliding block 322 positions the connecting rod 323 and the detection head 31, and the multiple detection heads 31 are arranged in a ring outside the part to be welded. During the entire welding process, the detection heads 31 are separated from the part and will not interfere with the welding process. After welding is completed, hydraulic cylinder 223 drives placement plate 224 to move vertically downward. At this time, the part is welded and fixed at the bottom of the stabilizer rod. The drive assembly 33 pulls the sliding block 322 one by one to move inside the horizontal cylinder 321. At this time, the sliding block 322 compresses the positioning spring 324. After the sliding block 322 moves to a certain position, the drive assembly 33 releases the restriction on the sliding block 322. At this time, the positioning spring 324 pushes the sliding block 322 to move rapidly in the opposite direction inside the horizontal cylinder 321. The sliding block 322 and the connecting rod 323 cooperate to push the detection head 31 to move rapidly towards the part in sync. The detection head 31 impacts the surface of the part at high speed, thereby detecting the welding effect and welding quality of the part. Multiple detection heads 31 around the part impact one by one, which can perform all-round impact detection of the welding effect of the part.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, in a preferred embodiment of the present invention, the drive assembly 33 includes a control ring 331 rotatably mounted on the outer side of a fixed ring 1. A gear ring 332 is fixedly mounted on the outer wall of the control ring 331. A fixing frame 333 is fixedly mounted on the surface of the fixed ring 1. A motor 334 is fixedly mounted on the surface of the fixing frame 333. A transmission gear disc 335 is fixedly mounted on the output shaft of the motor 334. The transmission gear disc 335 meshes with the gear ring 332. An annular control cavity 336 is formed on the inner side wall of the control ring 331. A traction cable 337 is fixedly mounted on the side wall of the sliding block 322. One end of the traction cable 337 away from the sliding block 322 extends to the outer side of the fixed ring 1 and is fixedly mounted with a control block 338. The control block 338 is located in the control cavity 336. The control block 338 is made of magnetic material. A magnetic sheet 339 is fixedly mounted in the control cavity 336.

[0034] When the welding effect of the parts needs to be inspected, the motor 334 drives the transmission gear 335 to rotate. The transmission gear 335 meshes with the gear ring 332, which can drive the control ring 331 to rotate outside the fixed ring 1. When the control ring 331 rotates, it drives the control cavity 336 and the magnetic plate 339 to rotate synchronously. The control block 338 is always in the control cavity 336. When the magnetic plate 339 and the control block 338 are connected as a whole by magnetic attraction, the magnetic plate 339 drives the control block 338 to move synchronously. The control block 338 and the traction cable 337 cooperate to pull the sliding block 322 to move in the horizontal cylinder 321. At this time, the sliding block 322 compresses the positioning spring 324, and the magnetic plate 339 continues to rotate. When the sliding block 322 moves to the limit position in the horizontal cylinder 321, the magnetic plate 339 and the control block 338 separate. At this time, the positioning spring 324 pushes the sliding block 322 to move rapidly in the opposite direction in the horizontal cylinder 321.

[0035] like Figure 7 As shown, in a preferred embodiment of the present invention, pull rings 4 are fixedly installed on the opposite side walls of the two clamping plates 211. The two clamping plates 211 can be easily moved back and forth by pulling the pull rings 4.

[0036] like Figure 6 As shown, in a preferred embodiment of the present invention, an annular limiting groove 5 is provided on the outer side of the fixed ring 1, and a limiting ring 6 is fixedly installed on the inner sidewall of the control ring 331. The limiting ring 6 is rotatably installed in the limiting groove 5. When the control ring 331 rotates on the surface of the fixed ring 1, the limiting ring 6 rotates synchronously in the limiting groove 5, which can effectively improve the stability of the control ring 331 during rotation.

[0037] The working principle of this invention is as follows: During use, the two clamping plates 211 are pulled in opposite directions to insert the stabilizing rod between them, releasing the clamping plates 211. The compression spring 2123 pushes the two clamping plates 211 to move relative to each other, and the two clamping plates 211 stably hold the stabilizing rod within the clamping hole 2111. The part to be welded is placed on the surface of the placement plate 224, and the hydraulic cylinder 223 pushes the placement plate 224 vertically upward. The placement plate 224 moves the part to be welded upward synchronously. When the part to be welded is in contact with the bottom end of the stabilizing rod, welding of the stabilizing rod and the part can be conveniently performed. Throughout the welding process, multiple detection heads 31 are arranged in a ring around the outside of the part to be welded, and the detection heads 31 do not interfere with the entire welding process.

[0038] After welding is completed, hydraulic cylinder 223 drives placement plate 224 to move vertically downward. At this time, the part is welded and fixed to the bottom end of the stabilizer bar. Motor 334 drives transmission gear 335 to rotate. Transmission gear 335 meshes with gear ring 332, which can drive control ring 331 to rotate outside fixed ring 1. When control ring 331 rotates, it drives control cavity 336 and magnetic sheet 339 to rotate synchronously. Control block 338 is always in control cavity 336. When magnetic sheet 339 and control block 338 are connected by magnetic attraction... When the components are integrated, the magnetic sheet 339 drives the control block 338 to move synchronously. The control block 338 and the traction cable 337 cooperate to pull the sliding block 322 within the horizontal cylinder 321. At this time, the sliding block 322 compresses the positioning spring 324, and the magnetic sheet 339 continues to rotate. When the sliding block 322 reaches its limit position within the horizontal cylinder 321, the magnetic sheet 339 and the control block 338 separate. At this time, the positioning spring 324 pushes the sliding block 322 to move rapidly in the opposite direction within the horizontal cylinder 321. The sliding block 322 and the connecting rod 323 cooperate to push the detection head 31 to move rapidly towards the part. The detection head 31 impacts the surface of the part at high speed, thereby detecting the welding effect and welding quality of the part. Multiple detection heads 31 around the part impact one by one, allowing for comprehensive impact testing of the welding effect. When the welding quality of the part is unqualified, the part may loosen at the bottom of the stabilizer rod or even fall off directly from the bottom of the stabilizer rod when the detection head 31 impacts the part.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A stabilizer bar connecting rod welding device, comprising a retaining ring (1), characterized in that, A positioning mechanism (2) is provided on the outside of the fixed ring (1). The positioning mechanism (2) includes an upper clamping component (21) and a lower clamping component (22). The upper clamping assembly (21) consists of a clamping plate (211) and a telescopic part (212). There are two clamping plates (211) and they are distributed opposite to each other. The two side walls of the two clamping plates (211) are respectively provided with clamping holes (2111). The telescopic part (212) is located above the fixed ring (1) and connected to the clamping plate (211). The telescopic part (212) is used to adjust the relative position between the two clamping plates (211) and thus fix the stabilizer bar. The lower clamping assembly (22) is located below the fixing ring (1) and is used to fix the part to be welded at the bottom end of the stabilizer bar; The surface of the fixed ring (1) is provided with a strength testing mechanism (3), which includes a testing head (31), a support component (32) and a driving component (33). The testing head (31) is provided with multiple parts. The support assembly (32) is located on the inner wall of the fixed ring (1) and connected to the detection head (31). The support assembly (32) is used to control multiple detection heads (31) to be distributed in a ring with equal spacing in the inner cavity of the fixed ring (1). The drive assembly (33) is located on the surface of the fixed ring (1) and connected to the support assembly (32). The drive assembly (33) is used to control multiple detection heads (31) to move intermittently toward the center of the fixed ring (1).

2. The stabilizer bar connecting rod welding device according to claim 1, characterized in that, The telescopic part (212) includes a plurality of oppositely distributed vertical plates (2121) fixedly installed on the upper surface of the fixing ring (1). A guide rod (2122) is fixedly installed between two oppositely distributed vertical plates (2121). The two ends of the clamping plate (211) are respectively slidably installed on the surface of the guide rod (2122). A compression spring (2123) is fixedly installed on the side wall of the vertical plate (2121). The telescopic end of the compression spring (2123) is connected to the clamping plate (211).

3. The stabilizer bar connecting rod welding device according to claim 1, characterized in that, The lower clamping assembly (22) includes multiple vertical rods (221) fixedly installed on the bottom wall of the fixed ring (1), a base plate (222) fixedly installed at the bottom end of the multiple vertical rods (221), a hydraulic cylinder (223) fixedly installed on the surface of the base plate (222), and a placement plate (224) fixedly installed at the telescopic end of the hydraulic cylinder (223).

4. The stabilizer bar connecting rod welding device according to claim 1, characterized in that, The support assembly (32) includes a plurality of horizontal cylinders (321) arranged in annular intervals and fixedly installed on the inner side wall of a fixing ring (1). A sliding block (322) is slidably installed inside the horizontal cylinder (321). A connecting rod (323) is fixedly installed on the side wall of the sliding block (322). One end of the connecting rod (323) away from the sliding block (322) extends to the outside of the horizontal cylinder (321) and is connected to the detection head (31). A positioning spring (324) is fixedly installed inside the horizontal cylinder (321) at the end away from the detection head (31). The extension end of the positioning spring (324) is connected to the sliding block (322).

5. The stabilizer bar connecting rod welding device according to claim 4, characterized in that, The drive assembly (33) includes a control ring (331) rotatably mounted on the outside of a fixed ring (1). A gear ring (332) is fixedly mounted on the outer wall of the control ring (331). A fixing frame (333) is fixedly mounted on the surface of the fixed ring (1). A motor (334) is fixedly mounted on the surface of the fixing frame (333). A transmission gear disc (335) is fixedly mounted on the output shaft of the motor (334). The transmission gear disc (335) meshes with the gear ring (332). The inner wall of the fixing ring (331) is provided with an annular control cavity (336). The side wall of the sliding block (322) is fixedly installed with a traction cable (337). The end of the traction cable (337) away from the sliding block (322) extends to the outside of the fixing ring (1) and is fixedly installed with a control block (338). The control block (338) is located in the control cavity (336). The control block (338) is made of magnetic material. A magnetic sheet (339) is fixedly installed in the control cavity (336).

6. The stabilizer bar connecting rod welding device according to claim 1, characterized in that, Pull rings (4) are fixedly installed on the opposite side walls of the two clamps (211).

7. A stabilizer bar connecting rod welding device according to claim 5, characterized in that, An annular limiting groove (5) is provided on the outer side of the fixed ring (1), and a limiting ring (6) is fixedly installed on the inner side wall of the control ring (331). The limiting ring (6) is rotatably installed in the limiting groove (5).