Arc welding clamp for elbow part in automobile exhaust system

Abstract

The utility model discloses an arc welding clamp for an elbow part in an automobile exhaust system, which belongs to the technical field of pipeline welding and comprises a flange pressing mechanism, an elbow pressing mechanism and an elbow jacking mechanism which are respectively mounted on a mounting frame. A flange is pressed through the flange pressing mechanism, one end of a bent pipe is pressed through the bent pipe pressing mechanism, the other end of the bent pipe is aligned to a flange connector, and a pipe body of the bent pipe is supported through the bent pipe jacking mechanism. According to the arc welding clamp, through the reasonable layout design of the structure, stable butt joint of the bent pipe and the flange can be achieved, the butt joint opening is located in the horizontal position, welding is convenient, and the welding quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline welding, in particular to an arc welding fixture for elbow components in an automobile exhaust system. Background Art

[0002] The automobile exhaust system is generally composed of an exhaust manifold, an exhaust pipe, a catalytic converter, an exhaust temperature sensor, a muffler and an exhaust tail pipe. The automobile exhaust system is mainly used to discharge the exhaust gas discharged by the engine, while reducing the pollution and noise of the exhaust gas. The automobile exhaust system is mainly used in light vehicles, micro cars and buses, motorcycles and other motor vehicles. Working principle: After the exhaust gas in the engine cylinder is discharged from the exhaust valve, it is collected to the exhaust main pipe through the exhaust manifold of each cylinder, purified by the three-way catalytic converter and silenced by the muffler, and then discharged from the exhaust tail pipe outside the vehicle.

[0003] A single exhaust of a certain automobile consists of an exhaust branch pipe, a front exhaust rib, a catalytic converter, an exhaust temperature sensor, a muffler, a rear exhaust pipe, etc. Arc welding process requirements for exhaust parts: The structural characteristics and welding requirements of various parts of the automobile exhaust system components are not consistent. According to the appearance of different types of workpieces and their welding characteristics, the process layout of the welding unit has various forms. According to the distance between the main functional modules and the engine, the exhaust system can also be divided into two parts: the hot end and the cold end. The hot end part is directly connected to the engine exhaust port, and mainly includes manifolds, purifiers, bellows, secondary purifiers, hook flanges and other accessories. Because of its compact chassis position, the shape of the parts varies greatly and the distribution of welds is complex. At the same time, because its main function is to purify exhaust gas, the sealing of the welds is required to be high. The cold end part takes over the hot end, mainly including middle muffler, rear muffler and hook flange and other accessories. The cold end assembly is usually longer in size, and the welds are mostly small-diameter circumferential seams. When the rear muffler package is a welding structure, press welding is usually required, and the amount of welds is large.

[0004] Although the existing technology can produce high-quality and rich models of automobile exhaust pipes, the technical level of workers in production varies greatly, and there are quality problems such as loose interfaces, insufficient corrosion resistance, and limited pressure bearing capacity. In particular, when welding elbows and flanges, the elbows are not easy to fix, and the stability of the joint with the flange is low, resulting in loose interfaces between the flange and the elbow, causing uneven welding effects. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model aims to provide an arc welding fixture for elbow components in an automobile exhaust system, which can fix the elbow and flange together and then perform welding mainly through reasonable design of the fixture tooling.

[0006] The technical solution adopted by this utility model:

[0007] An arc welding fixture for an elbow component in an automotive exhaust system. The fixture includes a flange pressing mechanism, a bent pipe pressing mechanism, and a bent pipe lifting mechanism. The flange pressing mechanism, the bent pipe pressing mechanism, and the bent pipe lifting mechanism are respectively installed on the mounting frame. The flange is pressed by the flange pressing mechanism, one end of the bent pipe is pressed by the bent pipe pressing mechanism, the other end of the bent pipe is aligned with the flange interface, and the body of the bent pipe is supported by the bent pipe lifting mechanism.

[0008] In the above technical solution, the flange pressing mechanism includes a connecting plate. On the front surface of the connecting plate, there is a mounting plate. At the edge of the mounting plate, there are multiple connecting rods. One end of the connecting rod penetrates through the connecting plate and is connected to the rotary tensioning assembly behind the connecting plate. The other end of it is rotatably provided with a limiting block. The flange is located between the limiting block and the mounting plate. And between the mounting plate and the rotary tensioning assembly, there is a movable plate A. On the front surface of the movable plate A, there are multiple limiting rods that cooperate with the connecting rods. The free ends of the limiting rods sequentially penetrate through the connecting plate and the mounting plate.

[0009] In the above technical solution, a compression spring A is provided on the limiting rod.

[0010] In the above technical solution, further, the rotary tensioning assembly includes an eccentric column. On the eccentric column, there is a guide shaft that penetrates through the column body. At the bottom of the guide shaft, there is a horizontal rod. One end of the connecting rod above the movable plate A is connected above the guide shaft, and one end of the connecting rod below the movable plate A is connected to the horizontal connecting rod.

[0011] In the above technical solution, further, a rotary handle is provided on the side wall of the eccentric column.

[0012] In the above technical solution, further, the bent pipe pressing mechanism includes an elbow pressing assembly. The elbow pressing assembly includes a mounting seat A and a mounting seat B. Both the mounting seat A and the mounting seat B are fixed on the mounting frame by screws. On the mounting seat A, there is an arc-shaped notch. Above the mounting seat A, there is a pressing block. On the pressing block, there is an arc-shaped notch B that cooperates with the arc-shaped notch A. One end of the bent pipe is located between the arc-shaped notch A and the arc-shaped notch B. A pressing force application assembly is connected to the pressing block, and the pressing force application assembly is provided on the mounting seat B.

[0013] In the above technical solution, further, the pressing force application assembly includes a vertical arm and a horizontal arm. The vertical arm is fixed on the mounting seat B by screws. One end of the horizontal arm is hinged to the vertical arm, and the other end is connected to the pressing block through a screw. On the wall of the vertical arm, there is also a pressing handle A hinged. On the body of the horizontal arm, it is hinged to the body of the pressing handle through a support rod.

[0014] In the above technical solution, further, a calibration block is provided on the support rod, and the calibration block is located above the horizontal arm.

[0015] In the above technical solution, further, the elbow pressing mechanism further includes an elbow head pressing assembly. The elbow head pressing assembly includes an L-shaped fixing seat A, which is fixed to the mounting bracket by screws. A movable plate B is arranged on the front surface of the L-shaped fixing seat A. A limiting frustum is arranged on the front surface of the movable plate B, and a moving column A is arranged on the back surface thereof. The moving column A passes through the L-shaped fixing seat A and is connected to a moving block behind the L-shaped fixing seat A. A pressing driving assembly is arranged on the back surface of the moving block.

[0016] In the above technical solution, further, the pressing driving assembly includes an L-shaped support plate. The bottom of the L-shaped support plate is connected to the L-shaped fixing seat A. An articulated seat A is arranged thereon. A V-shaped rod A is articulated on the articulated seat A. The rod body of the V-shaped rod A is articulated with one end of a movable column through a V-shaped rod B. The column body of the movable column passes through the vertical plate on the articulated seat A, and the other end thereof is connected to the moving block. The V-shaped rod A is also articulated with a pressing handle.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. The arc welding fixture designed by the present utility model can realize the stable butt joint of the elbow and the flange through the reasonable layout design of the structure. Its butting interface is in the horizontal position, which is convenient for welding, so as to improve the welding quality.

[0019] 2. The flange pressing mechanism designed by the present utility model is composed of a mounting plate, a connecting plate, a connecting rod, a limiting block, a movable plate A, a limiting rod, an eccentric column, etc. By the self-rotation of the eccentric column to squeeze the movable plate A, the limiting column is driven to extend out of the through hole on the mounting plate and into the flange hole to limit the flange, and the triple limit of the flange in the horizontal, vertical and circumferential directions is realized by the cooperation of the limiting block.

[0020] 3. The elbow pressing mechanism designed by the present utility model includes an elbow pressing assembly and an elbow head pressing assembly. The elbow pressing assembly limits one end of the elbow within the area between the arc-shaped notch A and the arc-shaped notch B, and the elbow is effectively fixed by the elbow head pressing assembly to squeeze the limiting frustum into the elbow port.

[0021] 4. The elbow lifting mechanism designed by the present utility model uses the leveraged lifting handle. Through the rotation of the V-shaped rod C and the V-shaped rod D, the moving column B is driven to push the pressing boss towards the elbow wall, and the pressing boss is inserted into the through hole on the elbow wall to realize the axial fixation of the elbow and prevent it from rotating. Description of the Drawings

[0022] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the embodiments. It should be understood that the following attached drawings only show certain embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related attached drawings can also be obtained based on these attached drawings.

[0023] Figure 1 It is a perspective view of an arc welding fixture for an elbow component in an automotive exhaust system in Embodiment 1.

[0024] Figure 2 It is a top view of an arc welding fixture for an elbow component in an automotive exhaust system in Embodiment 1.

[0025] Figure 3 It is a side view of an arc welding fixture for an elbow component in an automotive exhaust system in Embodiment 1.

[0026] Figure 4 It is a perspective view of a flange pressing mechanism in Embodiment 2.

[0027] Figure 5 For Figure 4 The perspective view after removing the connecting plate in

[0028] Figure 6 It is a perspective view of a bent pipe pressing mechanism in Embodiment 3.

[0029] Figure 7 For Figure 6 The perspective view from another angle.

[0030] Figure 8 It is a schematic diagram of a pressing force - applying component in Embodiment 3.

[0031] Figure 9 It is a perspective view of a bent pipe lifting mechanism in Embodiment 4.

[0032] Among them, 1. Base, 2. Mounting frame, 3. Flange pressing mechanism, 301. Connecting plate, 302. Mounting plate, 303. Link rod, 304. Movable plate A; 305. Limit block, 306. Compression spring B, 307. Limit rod, 308. Compression spring A, 309. Eccentric column, 310. Guide shaft, 311. Horizontal rod, 312. Rotating handle, 4. Elbow pipe, 5. Elbow pipe pressing mechanism, 501. Mounting seat B, 502. Vertical arm, 503. Pressing handle, 504. Support rod, 505. Horizontal arm, 506. Screw rod, 507. Pressing block, 508. Arc-shaped notch B, 509. Mounting seat A, 510. Arc-shaped notch A, 511. Limit round platform, 512. Movable plate B, 513. Moving block, 514. Movable column, 515. V-shaped rod B, 516. V-shaped rod A, 517. Hinge seat A, 518. Tightening handle, 519. L-shaped support plate, 520. L-shaped fixing seat A, 521. Moving column A, 522. Calibration block, 6. Elbow pipe lifting mechanism, 601. L-shaped fixing seat B, 602. Hinge seat B, 603. V-shaped rod C, 604. Lifting handle, 605. V-shaped rod D, 606. Horizontal push rod, 607. Moving column B, 608. Tightening boss. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0035] Embodiment 1

[0036] Referring to Figures 1-3 As shown, this embodiment provides an arc welding fixture for an elbow component in an automobile exhaust system, including a flange pressing mechanism 3, an elbow pipe pressing mechanism 5 and an elbow pipe lifting mechanism 6. The flange pressing mechanism 3, the elbow pipe pressing mechanism 5 and the elbow pipe lifting mechanism 6 are respectively installed on the mounting frame 2. The flange is pressed by the flange pressing mechanism 3, one end of the elbow pipe is pressed by the elbow pipe pressing mechanism 5, the other end of the elbow pipe is aligned with the flange interface, and the pipe body of the elbow pipe is supported by the elbow pipe lifting mechanism 6.

[0037] In this embodiment, the butt joint of the flange and the welded joint of the elbow is realized. First, the flange is placed on the flange pressing mechanism 3, then one end of the elbow is placed on the elbow pressing mechanism 5, and the other end of the elbow is adjusted to align with the flange. Then, the elbow lifting mechanism 6 is started to position and support the pipe wall of the elbow. After that, the elbow pressing mechanism 5 is started to press one end of the elbow. Finally, the welding of the connection between the elbow and the flange is carried out.

[0038] Embodiment 2

[0039] The flange pressing mechanism 3 includes a connecting plate 301. There is a notch on the front surface of the connecting plate 301. An installation plate 302 is arranged in the notch. A plurality of connecting rods 303 are arranged at the edge of the installation plate 302. One end of the connecting rod 303 penetrates through the connecting plate 301 and is connected to the rotary tensioning assembly behind the connecting plate 301. The other end thereof is rotatably provided with a limit block 305. The flange is located between the limit block 305 and the installation plate 302. A movable plate A304 is arranged between the installation plate 302 and the rotary tensioning assembly. A plurality of limit rods 307 matching with the connecting rods 303 are arranged on the front surface of the movable plate A304. The free ends of the limit rods 307 sequentially penetrate through the connecting plate 301 and the installation plate 302.

[0040] In this embodiment, a compression spring A308 is arranged on the limit rod 307. The compression spring A308 is located between the movable plate A304 and the connecting plate 301.

[0041] Secondly, a compression spring B306 is arranged on the connecting rod 303. The compression spring B306 is located between the limit block 305 and the connecting plate 301.

[0042] In this embodiment, there are 3 limit rods 307 and connecting rods 303 respectively. Each limit rod 307 corresponds to one connecting rod 303. And a rubber ring for increasing the friction force is arranged at the rotating joint of the limit block 305 rotated and connected to each connecting rod 303 and the connecting rod 303.

[0043] In this embodiment, the installation plate 302 and the movable plate A304 are located in the front-back direction of the connecting plate 301 and on the same horizontal axis. When the rotary tensioning assembly is rotated, the movable plate A304 is pushed to move towards the connecting plate 301, then the limit rod 307 is squeezed to move towards the limit block 305, so that the flange is clamped between the limit block 305 and the limit rod 307. And the contact surface between the limit rod 307 and the flange is made smooth, so as not to cause extrusion damage to the surface of the flange.

[0044] In this embodiment, the rotating tension assembly includes an eccentric column 309. A guide shaft 310 penetrating the column body is provided on the eccentric column 309. A horizontal rod 311 is provided at the bottom of the guide shaft 310. One end of a connecting rod 303 above the movable plate A304 is connected above the guide shaft 310, and one ends of two connecting rods 303 below the movable plate A304 are respectively connected to both ends of the horizontal connecting rod 303.

[0045] A rotating handle 312 is provided on the side wall of the eccentric column 309. The eccentric column 309 can be driven to rotate by itself through the rotating handle 312. In this process, the eccentric column 309 rotates around the guide shaft 310, and the guide shaft 310 does not rotate. Therefore, the eccentric column 309 and the guide shaft 310 can be connected by a bearing (but in order to increase the resistance between the eccentric column 309 and the guide shaft 310, a bearing may not be provided between the eccentric column 309 and the guide shaft 310). The connection parts of the connecting rod 303 with the guide shaft 310 and the horizontal rod 311 are tightened with nuts.

[0046] In this embodiment, the connecting plate 301 is fixed on the mounting bracket 2 by screws. The rotating limit block 305 faces the outside of the mounting plate 302. The flange is placed against the mounting plate 302, and the flange holes on the flange are aligned with the limit posts. At this time, the free end of the limit post is still located in the through hole of the mounting plate 302. After the flange holes are aligned with the limit posts, rotate the rotating handle 312. The column body of the eccentric column 309 squeezes the movable plate A304 to move towards the connecting plate 301. The limit post extends out of the through hole on the mounting plate 302 and extends into the flange hole to limit the flange. Then rotate the limit block 305, and the limit block 305 closely adheres to the front of the flange to limit the flange in the horizontal direction. During the above process, since the compression spring A308 on the limit post is compressed, it has a reverse acting force on both the movable plate A304 and the connecting plate 301, that is, it squeezes the movable plate A304 and the connecting plate 301. Since the back surface of the movable plate A304 is in contact with the eccentric column 309, the compression spring A308 increases the squeezing force between the movable plate A304 and the eccentric column 309. Therefore, when there is no external force after the eccentric column 309 rotates, it will not reset, that is, the limit post can continue to be inserted into the flange hole to limit the flange in the vertical direction.

[0047] Embodiment 3

[0048] The elbow pipe pressing mechanism 5 includes an elbow pressing assembly and an elbow head pressing assembly. The elbow pressing assembly includes a mounting seat A509 and a mounting seat B501. Both the mounting seat A509 and the mounting seat B501 are fixed on the mounting frame 2 by screws. An arc-shaped notch is provided on the mounting seat A509. Above the mounting seat A509, there is a pressing block 507. An arc-shaped notch B508 that cooperates with the arc-shaped notch A510 is provided on the pressing block 507. One end of the elbow pipe is located between the arc-shaped notch A510 and the arc-shaped notch B508. A pressing force applying assembly is connected to the pressing block 507, and the pressing force applying assembly is arranged on the mounting seat B501.

[0049] The pressing force applying assembly includes a vertical arm 502 and a horizontal arm 505. The vertical arm 502 is fixed on the mounting seat B501 by screws. One end of the horizontal arm 505 is hinged to the vertical arm 502, and the other end is connected to the pressing block 507 through a screw rod 506. A pressing handle 503A is also hinged on the wall of the vertical arm 502. The arm of the horizontal arm 505 is hinged to the arm of the pressing handle 503 through a support rod 504.

[0050] After the elbow pipe is placed into the arc-shaped notch A510, the pressing handle 503A is pulled upward. The horizontal arm 505 is driven to press down through the support rod 504, thereby driving the pressing block 507 to press down on the elbow pipe wall to fix the elbow pipe.

[0051] To prevent the pressing handle 503 from rotating excessively towards the pressing block 507, a calibration block 522 is provided on the support rod 504, and the calibration block 522 is located above the horizontal arm 505.

[0052] The elbow head pressing assembly includes an L-shaped fixed seat A520. The L-shaped fixed seat A520 is fixed on the mounting frame 2 by screws. A movable plate B512 is provided on the front surface of the L-shaped fixed seat A520. A limiting round table 511 is provided on the front surface of the movable plate B512, and a moving column A521 is provided on the back surface. The moving column A521 passes through the L-shaped fixed seat A520 and is connected to a moving block 513 behind the L-shaped fixed seat A520. A pressing driving assembly is provided on the back surface of the moving block 513, and the moving block 513 is driven to move through the pressing driving assembly.

[0053] The pressing driving assembly includes an L-shaped support plate 519. The bottom of the L-shaped support plate 519 is connected to the L-shaped fixed seat A520. An articulated seat A517 is provided thereon. A V-shaped rod A516 is hinged to the articulated seat A517. One end of the V-shaped rod A516 is hinged to one end of a movable column 514 through a V-shaped rod B515. The column of the movable column 514 passes through the vertical plate on the articulated seat A517, and the other end is connected to the moving block 513. The V-shaped rod A516 is also hinged to a pressing handle 518.

[0054] Press the tightening handle 518 to rotate it in the direction of the moving block 513, and the V-shaped rod A516 drives the V-shaped rod B515 to pull the movable rod to move toward the vertical arm 502 of the L-shaped fixed seat A520, and then drives the movable column A521 to pull the movable plate B512 to move toward the mounting seat A509, and the limiting cone 511 on the movable plate B512 is inserted into the bent pipe to fix the bent pipe.

[0055] Example 4

[0056] The bent pipe lifting mechanism 6 includes an L-shaped fixed seat B601, which is arranged on the mounting frame 2. A hinged seat B602 is arranged on the L-shaped fixed seat B601, and a V-shaped rod C603 is hinged on the hinged seat B602. The V-shaped rod C603 is hinged to one end of a horizontal push rod 606 through a V-shaped rod D605. The rod body of the horizontal push rod 606 passes through the vertical plate on the hinged seat B602, and the other end is connected to one end of a movable column B607. The other end of the movable column B607 passes through the vertical wall of the L-shaped fixed seat B601 and is connected to the tightening boss 608. The V-shaped rod C603 is also hinged to the lifting handle 604.

[0057] After the flange is fixed to the flange clamping mechanism 3, the elbow is installed, one end of the elbow is aligned with the welding port of the flange, and the other end is placed in the arc-shaped notch. After being clamped by the clamping block 507, the top clamping handle 518 is turned to push the limiting round table 511 into the elbow, and the horizontal and vertical directions of the elbow are fixed. Then the lifting handle 604 is turned, and the V-shaped rod C603 and the V-shaped rod D605 are rotated to drive the moving column B607 to push the top clamping boss 608 to move toward the elbow wall, and the top clamping boss 608 is inserted into the through hole on the elbow wall to fix the elbow axially and prevent it from rotating. Finally, the welding operation is carried out.

[0058] In Examples 1-4, the mounting frame 2 below the flange clamping mechanism 3, the mounting frame 2 below the elbow clamping mechanism 5, and the mounting frame 2 below the elbow lifting mechanism 6 are all arranged on the base 1. And the mounting surfaces of the three mounting frames 2 will be inclined at different angles according to the matching relationship between the flange clamping mechanism 3, the elbow clamping mechanism 5, and the elbow lifting mechanism 6.

[0059] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the utility model still falls within the protection scope of the technical solution of the utility model.

Claims

1. An arc welding fixture for elbow components in automobile exhaust systems, characterized in that: It includes a flange clamping mechanism, a bent pipe clamping mechanism and a bent pipe lifting mechanism, which are respectively installed on a mounting frame. The flange is clamped by the flange clamping mechanism, and the bent pipe clamping mechanism clamps one end of the bent pipe. The other end of the bent pipe is aligned with the flange interface, and the bent pipe lifting mechanism is used to support the pipe body of the bent pipe.

2. The arc welding fixture for elbow components in an automobile exhaust system according to claim 1, characterized in that: The flange clamping mechanism includes a connecting plate, a mounting plate is arranged on the front of the connecting plate, a plurality of connecting rods are arranged on the edge of the mounting plate, one end of the connecting rod passes through the connecting plate and is connected to the rotating tensioning assembly behind the connecting plate, and the other end thereof rotates a limiting block, the flange is located between the limiting block and the mounting plate, and a movable plate A is arranged between the mounting plate and the rotating tensioning assembly, a plurality of limiting rods cooperating with the connecting rods are arranged on the front of the movable plate A, and the free ends of the limiting rods pass through the connecting plate and the mounting plate in sequence.

3. The arc welding fixture for elbow components in an automobile exhaust system according to claim 2, characterized in that: A compression spring A is arranged on the limiting rod.

4. The arc welding fixture for elbow components in an automobile exhaust system according to claim 2, characterized in that: The rotary tension assembly includes an eccentric column, on which a guide shaft penetrating the column body is arranged, a horizontal rod is arranged at the bottom of the guide shaft, one end of the connecting rod located above the movable plate A is connected to the top of the guide shaft, and one end of the connecting rod located below the movable plate A is connected to the horizontal connecting rod.

5. The arc welding fixture for elbow components in automobile exhaust system according to claim 4, characterized in that: A rotating handle is arranged on the side wall of the eccentric column.

6. The arc welding fixture for elbow components in an automobile exhaust system according to claim 1, characterized in that: The elbow clamping mechanism includes an elbow clamping assembly, which includes a mounting seat A and a mounting seat B. Both the mounting seat A and the mounting seat B are fixed to the mounting frame by screws. The mounting seat A is provided with an arc-shaped notch, and a clamping block is provided above the mounting seat A. The clamping block is provided with an arc-shaped notch B that matches the arc-shaped notch A. One end of the elbow is located between the arc-shaped notch A and the arc-shaped notch B. The clamping block is connected to a clamping force applying assembly, and the clamping force applying assembly is provided on the mounting seat B.

7. The arc welding fixture for elbow components in an automobile exhaust system according to claim 6, characterized in that: The clamping force assembly includes a vertical arm and a horizontal arm. The vertical arm is fixed to the mounting base B by screws. One end of the horizontal arm is hinged to the vertical arm, and the other end is connected to the clamping block by a screw. A clamping handle A is also hinged to the wall of the vertical arm, and the arm body of the horizontal arm is hinged to the arm body of the clamping handle by a support rod.

8. The arc welding fixture for elbow components in automobile exhaust system according to claim 7, characterized in that: A calibration block is arranged on the support rod and is located above the horizontal arm.

9. The arc welding fixture for elbow components in an automobile exhaust system according to claim 6, characterized in that: The elbow clamping mechanism also includes an elbow tightening assembly, which includes an L-shaped fixing seat A, which is fixed to the mounting frame by screws. A movable plate B is arranged on the front of the L-shaped fixing seat A, and a limited position frustum is arranged on the front of the movable plate B, and a moving column A is arranged on the back thereof. The moving column A penetrates the L-shaped fixing seat A and is connected to a moving block behind the L-shaped fixing seat A, and a tightening drive assembly is arranged on the back of the moving block.

10. The arc welding fixture for elbow components in automobile exhaust system according to claim 9, characterized in that: The tightening drive assembly includes an L-shaped support plate, the bottom of which is connected to an L-shaped fixed seat A, on which is provided an articulated seat A, on which is hinged a V-shaped rod A, the body of the V-shaped rod A is hinged to one end of a movable column through a V-shaped rod B, the body of the movable column passes through a vertical plate on the articulated seat A, and the other end is connected to a moving block, and the V-shaped rod A is also hinged to a tightening handle.

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