Welding swing arm for machining hydraulic arm assembly of automobile tailboard

By designing fastening and adjustment components, the problems of unstable clamping and difficulty in angle adjustment in traditional automotive tailgate welding have been solved, enabling efficient and precise multi-angle welding and improving welding quality and efficiency.

CN122058112APending Publication Date: 2026-05-19YANCHENG QIANFANG MACHINERY CO LTD
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Patent Information

Application Number
CN202610244786.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-02
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

In the traditional automotive tailgate welding process, the lack of reliable four-sided clamping and limiting structures leads to insufficient welding precision, poor product consistency, and difficulty in adapting to multi-angle welding requirements, affecting production efficiency and quality.

Method used

It employs fastening components, limiting components, and adjustment components. A cylinder drives a telescopic rod to clamp the guide block and fixed column. Combined with a servo motor driving a threaded rod to adjust the angle of the stage, it can achieve multi-angle posture adjustment.

Benefits of technology

It achieves reliable clamping and flexible angle adjustment of the car tailgate, improves welding accuracy and finished product consistency, and enhances production efficiency and welding quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a welding swing arm for automobile tailboard hydraulic arm assembly machining, and relates to the technical field of automobile tailboard welding, the welding swing arm comprises a machining table, a supporting plate is fixedly connected to one side of the top surface of the machining table, a control panel is fixedly mounted on the surface of the supporting plate, and a mechanical arm is fixedly mounted on the top surface of the supporting plate; a welding machine is arranged at one end of the mechanical arm, and an objective table is arranged on the machining table. The automobile tailboard carrying table is reasonable in structure, an automobile tailboard on the carrying table is fixed through the fastening assembly and the limiting assembly, when a welding machine conducts welding, multi-angle posture adjustment can be conducted on the automobile tailboard on the carrying table through the adjusting assembly, and the welding machine can conduct welding work conveniently.
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Description

Technical Field

[0001] This invention relates to the field of automotive tailgate welding technology, and in particular to a welded swing arm for processing automotive tailgate hydraulic arm components. Background Technology

[0002] With the rapid development of urban logistics and road freight, truck loading and unloading efficiency and operational safety have become key industry requirements. Traditional manual loading and unloading relies on manpower and loading / unloading platforms, which is time-consuming, labor-intensive, costly, and prone to cargo damage and personnel accidents. Truck tailgates, as hydraulic lifting and unloading devices installed at the rear of vehicles, are powered by the vehicle's onboard power supply, enabling autonomous lifting and unloading of goods, significantly improving operational efficiency.

[0003] A welding device for processing automobile tailgates, disclosed in Chinese Utility Model Patent Publication No. CN223776320U, includes a welding device body, which comprises a welding frame and a welding base. Welding support plates are arranged on both sides of the welding base, and welding structures are fitted onto the welding support plates. Each welding structure includes a bottom sliding block positioned at the top of the welding support plate, and welding support columns are fitted onto the bottom sliding blocks. Welding crossbeams are connected to the welding support columns on both sides above the welding base, and welding torch assemblies are mounted on the welding crossbeams. Through optimized structural design, the flexibility and adaptability of the welding device are improved, achieving efficient and precise welding.

[0004] There are still some problems in the welding process of the car tailgate.

[0005] In the manufacturing process of automotive tailgates, the welding process directly affects their structural strength and assembly accuracy. Traditional tailgate welding often uses simple supports or manual positioning methods, merely placing the tailgate workpiece without reliable four-sided clamping and limiting structures. This makes it prone to displacement and loosening under welding stress, resulting in insufficient welding accuracy and poor product consistency. Furthermore, existing tooling is mostly a fixed structure, making it difficult to adjust the tailgate's posture at multiple angles. This fails to meet the welding requirements of multiple workstations and angles, resulting in low operational flexibility and impacting production efficiency and welding quality. Summary of the Invention

[0006] The purpose of this application is to provide a welding swing arm for processing a hydraulic arm assembly for a car tailgate, which realizes the fixation of the car tailgate on the platform through fastening components and limiting components. When the welding machine is welding, the car tailgate on the platform can be adjusted at multiple angles by adjusting the components, which facilitates the welding machine to perform welding work.

[0007] To achieve the above objectives, this application provides the following technical solution: a welding swing arm for processing a hydraulic arm assembly for a car tailgate, comprising a processing table, a support plate fixedly connected to one side of the top surface of the processing table, a control panel fixedly installed on the surface of the support plate, a robotic arm fixedly installed on the top surface of the support plate, a welding machine installed at one end of the robotic arm, and a platform provided on the processing table;

[0008] It also includes a fastening component, a limiting component, and an adjusting component. The fastening component is disposed on the workpiece stage for fixing the workpiece. The limiting component is disposed on the bottom surface of the workpiece stage for use in conjunction with the fastening component. The adjusting component is disposed on the processing table for controlling the angle of the workpiece stage.

[0009] Preferably, the fastening assembly includes a pair of slides formed on the platform, a guide block is slidably connected inside the pair of slides, a top plate is fixedly connected to the top of the guide block, a fixing post is fixedly connected to the top surface of the top plate, and a roller is rotatably connected to the fixing post.

[0010] Preferably, the bottom end of the guide block is fixedly connected to the base plate, a docking seat is fixedly connected to the middle of the bottom surface of the base plate, a telescopic rod is fixedly connected to the docking seat, the other end of the telescopic rod is set on a cylinder, the cylinder is fixedly installed on the bottom surface of the mounting plate, and the mounting plate is fixedly installed on the bottom surface of the platform.

[0011] Preferably, the limiting component includes a sleeve rod fixedly installed on the telescopic rod, a fixing plate is fixedly connected symmetrically to the surface of the sleeve rod, a side plate is fixedly connected to the other end of the fixing plate, and a hinge seat is fixedly connected to the side of the side plate away from the fixing plate.

[0012] Preferably, a linkage plate is rotatably connected to the hinge seat, the other end of the linkage plate is rotatably connected to the docking rod, the top end of the docking rod is fixedly connected to the slide plate, a slider is fixedly connected to the top surface of the slide plate, the slider is slidably connected to the slide rail, and the slide rail is fixedly installed on the bottom surface of the platform.

[0013] Preferably, a push rod is movably inserted into one side of the slide plate, one end of the push rod is fixedly connected to a pressure plate, the other end of the push rod is fixedly connected to a collar, and a spring is sleeved on the push rod. The two ends of the spring are respectively fixedly connected to one side of the slide plate and one side of the collar.

[0014] Preferably, the adjustment assembly includes a first bearing fixedly installed on one side of the bottom surface of the platform, the bottom end of the first bearing being rotatably connected to the rod, and the two ends of the rod being fixedly connected to a second bearing.

[0015] Preferably, a frame is fixedly connected to both sides of the second shaft seat, and a pulley is rotatably connected to the frame. The pulley is slidably connected to a slide rod, one end of the slide rod is fixedly connected to a side seat, and the bottom end of the side seat is fixedly connected to the processing table.

[0016] Preferably, a servo motor is fixedly mounted on the processing table, and a threaded rod is fixedly connected to the output end of the servo motor. A sleeve is threadedly connected to the threaded rod, and the bottom surface of the sleeve is fixedly connected to the middle position of the second shaft seat.

[0017] Preferably, a third bearing is fixedly connected to the middle of both sides of the bottom surface of the platform, a crossbar is fixedly connected to the third bearing, the other end of the crossbar is rotatably connected to the driven plate, the other end of the driven plate is rotatably connected to the rotating rod, the rotating rod is fixedly connected to the limiting seat, and the other end of the sliding rod is fixedly connected to the limiting seat.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. The present invention has a reasonable structure. The telescopic rod is retracted by the operation of the cylinder. Then, the docking seat at the other end of the telescopic rod will drive the base plate to move. Guide blocks are fixedly connected to both sides of the top surface of the base plate. The movement of the base plate causes the guide blocks to slide inside the slide groove. A top plate is fixedly connected to the top of the guide blocks. The movement of the guide blocks drives the top plate to move. A fixing column is fixedly connected to the top plate, and a roller is rotatably connected to the fixing column. The movement of the top plate causes the roller on the fixing column to clamp and fix the tailgate of the car.

[0020] 2. In this invention, a sleeve is fixedly connected to the surface of the telescopic rod. The sleeve moves by the retraction of the telescopic rod. A fixing plate is fixedly connected to the surface of the sleeve, and a side plate is fixedly connected to the other end of the fixing plate. The movement of the sleeve drives the side plate to move through the fixing plate. The movement of the side plate pulls the sliding plate on the connecting rod through the linkage plate on the hinge seat. A slider is fixedly installed on the sliding plate, and the slider is slidably connected to the slide rail. The movement of the sliding plate drives the slide rail to move through the slider. The movement of the sliding plate causes the pressure plate to adhere to both sides of the car tailgate by the elastic force of the spring.

[0021] 3. In this invention, when adjusting the angle of the car tailgate on the platform, the servo motor on the processing table operates, causing the threaded rod to rotate. A sleeve is threadedly connected to the threaded rod. The rotation of the threaded rod causes the sleeve to move, which in turn moves the second axle seat. The movement of the second axle seat causes the pulley on the frame to slide on the slide rod, increasing the stability of the movement of the second axle seat. The movement of the second axle seat facilitates the rotation of the first axle seat on the rod. The rotation of the first axle seat causes the platform to tilt, and then one end of the driven plate rotates on the crossbar, cooperating with the platform to adjust the angle. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the processing table;

[0024] Figure 2 This is a rear-view 3D structural diagram of the processing table;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the pallet;

[0026] Figure 4 A side view of the three-dimensional structure of the stage;

[0027] Figure 5 A schematic diagram of the three-dimensional structure of the stage viewed from below;

[0028] Figure 6 This is a schematic diagram of the three-dimensional structure of the fastening assembly;

[0029] Figure 7 A schematic diagram of the three-dimensional structure of the adjustment component.

[0030] In the diagram: 1. Processing table; 101. Pallet; 102. Control panel; 103. Robotic arm; 104. Welding machine; 105. Platform; 2. Slide; 201. Guide block; 202. Top plate; 203. Fixed column; 204. Roller; 205. Base plate; 206. Docking seat; 207. Telescopic rod; 208. Cylinder; 209. Mounting plate; 3. Sleeve rod; 301. Fixed plate; 302. Side plate; 303. Hinge seat; 304. Linkage plate; 305. Docking 306. Rod; 307. Slider; 308. Slide rail; 309. Push rod; 310. Pressure plate; 311. Collar; 312. Spring; 4. First shaft seat; 401. Rod body; 402. Second shaft seat; 403. Frame; 404. Pulley; 405. Slide rod; 406. Side seat; 407. Servo motor; 408. Threaded rod; 409. Sleeve seat; 410. Third shaft seat; 411. Crossbar; 412. Driven plate; 413. Rotating rod; 414. Limit seat. Detailed Implementation

[0031] 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.

[0032] Example: Reference Figure 1 - Figure 7 The diagram shows a welding swing arm for processing a hydraulic arm assembly for a car tailgate. It includes a processing table 1, a support plate 101 fixedly connected to one side of the top surface of the processing table 1, a control panel 102 fixedly mounted on the surface of the support plate 101, a robotic arm 103 fixedly mounted on the top surface of the support plate 101, a welding machine 104 mounted at one end of the robotic arm 103, and a platform 105 on the processing table 1. It also includes a fastening assembly, a limiting assembly, and an adjusting assembly. The fastening assembly is mounted on the platform 105 for fixing the workpiece, the limiting assembly is mounted on the bottom surface of the platform 105 for use in conjunction with the fastening assembly, and the adjusting assembly is mounted on the processing table 1 for controlling the angle of the platform 105.

[0033] Specifically, it should be noted that the servo motor 407 is electrically connected to the control panel 102 via wires. The specific working principle between them is based on existing technology and will not be elaborated on here.

[0034] As one embodiment of this invention, the fastening assembly includes a pair of sliding grooves 2 formed on the platform 105. A guide block 201 is slidably connected inside the pair of sliding grooves 2. A top plate 202 is fixedly connected to the top of the guide block 201. A fixing post 203 is fixedly connected to the top surface of the top plate 202. A roller 204 is rotatably connected to the fixing post 203. The bottom end of the guide block 201 is fixedly connected to the base plate 205. A docking seat 206 is fixedly connected to the middle of the bottom surface of the base plate 205. A telescopic rod 207 is fixedly connected to the docking seat 206. The other end of the telescopic rod 207 is disposed on a cylinder 208. The cylinder 208 is fixedly installed on the bottom surface of the mounting plate 209. The mounting plate 209 is fixedly installed on the bottom surface of the platform 105.

[0035] Specifically, the telescopic rod 207 is retracted by the operation of the cylinder 208, and then the docking seat 206 at the other end of the telescopic rod 207 will drive the base plate 205 to move. Guide blocks 201 are fixedly connected to both sides of the top surface of the base plate 205. The movement of the base plate 205 causes the guide blocks 201 to slide inside the slide groove 2. The top plate 202 is fixedly connected to the top of the guide blocks 201. The movement of the guide blocks 201 drives the top plate 202 to move. The fixing post 203 is fixedly connected to the top plate 202, and the roller 204 is rotatably connected to the fixing post 203. The movement of the top plate 202 causes the roller 204 on the fixing post 203 to clamp and fix the tailgate of the car.

[0036] In one embodiment of this invention, the limiting component includes a sleeve rod 3 fixedly mounted on the telescopic rod 207. A fixing plate 301 is symmetrically fixedly connected to the surface of the sleeve rod 3. A side plate 302 is fixedly connected to the other end of the fixing plate 301. A hinge seat 303 is fixedly connected to the side of the side plate 302 away from the fixing plate 301. A linkage plate 304 is rotatably connected to the hinge seat 303. The other end of the linkage plate 304 is rotatably connected to a connecting rod 305. The top end of the connecting rod 305 is fixedly connected to a sliding plate 30. On the 6, a slider 307 is fixedly connected to the top surface of the slide plate 306. The slider 307 is slidably connected to the slide rail 308. The slide rail 308 is fixedly installed on the bottom surface of the platform 105. A push rod 309 is movably inserted into one side of the slide plate 306. A pressure plate 310 is fixedly connected to one end of the push rod 309. A collar 311 is fixedly connected to the other end of the push rod 309. A spring 312 is sleeved on the push rod 309. The two ends of the spring 312 are fixedly connected to one side of the slide plate 306 and one side of the collar 311, respectively.

[0037] Specifically, a sleeve rod 3 is fixedly connected to the surface of the telescopic rod 207. The sleeve rod 3 moves when the telescopic rod 207 retracts. A fixing plate 301 is fixedly connected to the surface of the sleeve rod 3, and a side plate 302 is fixedly connected to the other end of the fixing plate 301. The movement of the sleeve rod 3 drives the side plate 302 to move through the fixing plate 301. The movement of the side plate 302 pulls the sliding plate 306 on the connecting rod 305 through the linkage plate 304 on the hinge seat 303. A slider 307 is fixedly installed on the sliding plate 306, and the slider 307 is slidably connected to the slide rail 308. The movement of the sliding plate 306 drives the slide rail 308 to move through the slider 307. The movement of the sliding plate 306 causes the pressure plate 310 to adhere to both sides of the car tailgate by the elastic force of the spring 312.

[0038] In one embodiment of this invention, the adjustment assembly includes a first bearing 4 fixedly mounted on one side of the bottom surface of the platform 105. The bottom end of the first bearing 4 is rotatably connected to a rod 401. Both ends of the rod 401 are fixedly connected to a second bearing 402. A frame 403 is fixedly connected to both sides of the second bearing 402. A pulley 404 is rotatably connected to the frame 403. The pulley 404 is slidably connected to a slide rod 405. One end of the slide rod 405 is fixedly connected to a side seat 406. The bottom end of the side seat 406 is fixedly connected to the processing table 1. A servo motor 40 is fixedly mounted on the processing table 1. 7. A threaded rod 408 is fixedly connected to the output end of the servo motor 407. A sleeve 409 is threadedly connected to the threaded rod 408. The bottom surface of the sleeve 409 is fixedly connected to the middle position of the second bearing 402. A third bearing 410 is fixedly connected to the middle positions of both sides of the bottom surface of the platform 105. A crossbar 411 is fixedly connected to the third bearing 410. The other end of the crossbar 411 is rotatably connected to the driven plate 412. The other end of the driven plate 412 is rotatably connected to the rotating rod 413. The rotating rod 413 is fixedly connected to the limiting seat 414. The other end of the slide rod 405 is fixedly connected to the limiting seat 414.

[0039] Specifically, when adjusting the angle of the car tailgate on the platform 105, the servo motor 407 on the processing table 1 operates, causing the threaded rod 408 to rotate. The threaded rod 408 is threadedly connected to a sleeve 409. The rotation of the threaded rod 408 causes the sleeve 409 to move, which in turn causes the second axle seat 402 to move as a whole. The movement of the second axle seat 402 causes the pulley 404 on the frame 403 to slide on the slide bar 405, increasing the stability of the movement of the second axle seat 402. The movement of the second axle seat 402 facilitates the rotation of the first axle seat 4 on the rod 401. The rotation of the first axle seat 4 causes the platform 105 to tilt, and then one end of the driven plate 412 rotates on the crossbar 411, cooperating with the platform 105 to adjust the angle.

[0040] The working principle of this invention is as follows: The telescopic rod 207 is retracted by the operation of the cylinder 208. Then, the docking seat 206 at the other end of the telescopic rod 207 will drive the base plate 205 to move. Guide blocks 201 are fixedly connected to both sides of the top surface of the base plate 205. The movement of the base plate 205 causes the guide blocks 201 to slide inside the slide groove 2. The top plate 202 is fixedly connected to the top of the guide blocks 201. The movement of the guide blocks 201 drives the top plate 202 to move. The fixing column 203 is fixedly connected to the top plate 202, and the roller 204 is rotatably connected to the fixing column 203. The movement of the top plate 202 causes the roller 204 on the fixing column 203 to clamp and fix the tailgate of the car.

[0041] A sleeve rod 3 is fixedly connected to the surface of the telescopic rod 207. The sleeve rod 3 moves when the telescopic rod 207 retracts. A fixing plate 301 is fixedly connected to the surface of the sleeve rod 3, and a side plate 302 is fixedly connected to the other end of the fixing plate 301. The movement of the sleeve rod 3 drives the side plate 302 to move through the fixing plate 301. The movement of the side plate 302 pulls the sliding plate 306 on the connecting rod 305 through the linkage plate 304 on the hinge seat 303. A slider 307 is fixedly installed on the sliding plate 306, and the slider 307 is slidably connected to the slide rail 308. The movement of the sliding plate 306 drives the slide rail 308 to move through the slider 307. The movement of the sliding plate 306 causes the pressure plate 310 to adhere to both sides of the car tailgate by the elastic force of the spring 312.

[0042] When adjusting the angle of the car tailgate on the platform 105, the servo motor 407 on the processing table 1 operates, causing the threaded rod 408 to rotate. The threaded rod 408 is threadedly connected to a sleeve 409. The rotation of the threaded rod 408 causes the sleeve 409 to move. The movement of the sleeve 409 drives the second axle seat 402 to move as a whole. The movement of the second axle seat 402 causes the pulley 404 on the frame 403 to slide on the slide rod 405, increasing the stability of the movement of the second axle seat 402. The movement of the second axle seat 402 facilitates the rotation of the first axle seat 4 on the rod 401. The rotation of the first axle seat 4 causes the platform 105 to tilt, and then one end of the driven plate 412 rotates on the crossbar 411, cooperating with the platform 105 to adjust the angle.

[0043] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welded swing arm for machining a hydraulic arm assembly for a car tailgate, characterized in that, include: A processing table (1) is provided. A tray (101) is fixedly connected to one side of the top surface of the processing table (1). A control panel (102) is fixedly installed on the surface of the tray (101). A robotic arm (103) is fixedly installed on the top surface of the tray (101). A welding machine (104) is installed at one end of the robotic arm (103). A platform (105) is provided on the processing table (1). It also includes a fastening component, a limiting component and an adjusting component. The fastening component is disposed on the stage (105) for fixing the workpiece. The limiting component is disposed on the bottom surface of the stage (105) for use in conjunction with the fastening component. The adjusting component is disposed on the processing table (1) for controlling the angle of the stage (105).

2. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 1, characterized in that: The fastening assembly includes a pair of slides (2) formed on the platform (105), with guide blocks (201) slidably connected inside the pair of slides (2), a top plate (202) fixedly connected to the top of the guide blocks (201), a fixing post (203) fixedly connected to the top surface of the top plate (202), and a roller (204) rotatably connected to the fixing post (203).

3. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 2, characterized in that: The bottom end of the guide block (201) is fixedly connected to the base plate (205). A docking seat (206) is fixedly connected to the middle of the bottom surface of the base plate (205). A telescopic rod (207) is fixedly connected to the docking seat (206). The other end of the telescopic rod (207) is set on the cylinder (208). The cylinder (208) is fixedly installed on the bottom surface of the mounting plate (209). The mounting plate (209) is fixedly installed on the bottom surface of the platform (105).

4. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 3, characterized in that: The limiting component includes a sleeve (3) fixedly installed on the telescopic rod (207). A fixing plate (301) is symmetrically fixedly connected to the surface of the sleeve (3). A side plate (302) is fixedly connected to the other end of the fixing plate (301). A hinge seat (303) is fixedly connected to the side of the side plate (302) away from the fixing plate (301).

5. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 4, characterized in that: A linkage plate (304) is rotatably connected to the hinge seat (303). The other end of the linkage plate (304) is rotatably connected to the docking rod (305). The top end of the docking rod (305) is fixedly connected to the slide plate (306). A slider (307) is fixedly connected to the top surface of the slide plate (306). The slider (307) is slidably connected to the slide rail (308). The slide rail (308) is fixedly installed on the bottom surface of the platform (105).

6. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 5, characterized in that: A push rod (309) is movably inserted into one side of the slide plate (306). One end of the push rod (309) is fixedly connected to a pressure plate (310), and the other end of the push rod (309) is fixedly connected to a collar (311). A spring (312) is sleeved on the push rod (309), and the two ends of the spring (312) are fixedly connected to one side of the slide plate (306) and one side of the collar (311), respectively.

7. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 2, characterized in that: The adjustment assembly includes a first bearing (4) fixedly installed on one side of the bottom surface of the platform (105), the bottom end of the first bearing (4) being rotatably connected to the rod (401), and the two ends of the rod (401) being fixedly connected to the second bearing (402).

8. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 7, characterized in that: The second shaft seat (402) is fixedly connected to the two sides of the frame (403), and the frame (403) is rotatably connected to the pulley (404). The pulley (404) is slidably connected to the slide rod (405). One end of the slide rod (405) is fixedly connected to the side seat (406), and the bottom end of the side seat (406) is fixedly connected to the processing table (1).

9. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 8, characterized in that: A servo motor (407) is fixedly installed on the processing table (1). A threaded rod (408) is fixedly connected to the output end of the servo motor (407). A sleeve (409) is threadedly connected to the threaded rod (408). The bottom surface of the sleeve (409) is fixedly connected to the middle position of the second shaft seat (402).

10. The welded swing arm for processing a hydraulic arm assembly for a car tailgate according to claim 9, characterized in that: A third bearing seat (410) is fixedly connected to the middle of both sides of the bottom surface of the platform (105). A crossbar (411) is fixedly connected to the third bearing seat (410). The other end of the crossbar (411) is rotatably connected to the driven plate (412). The other end of the driven plate (412) is rotatably connected to the rotating rod (413). The rotating rod (413) is fixedly connected to the limiting seat (414). The other end of the slide rod (405) is fixedly connected to the limiting seat (414).