Fixture for welding small rims

Abstract

The invention discloses a clamp for welding a small rim. The clamp comprises a chassis and a clamping device, the clamping device comprises a sliding block installed on the chassis in a sliding mode, a sliding driving device used for driving the sliding block to move, a lifting block, a lifting driving device used for driving the lifting block to move, a rotating frame rotationally installed on the lifting block, a rotating driving device used for driving the rotating frame to rotate and a plurality of supporting frames installed on the rotating frame in a sliding mode. A plurality of groups of rim clamping assemblies are arranged on the supporting frame, rim positioning assemblies are arranged on the rim clamping assemblies at the two ends, and rim rotating assemblies are arranged on the other rim clamping assemblies; the clamping rod is rotationally mounted on the mounting seat, and the first auxiliary clamping rod and the second auxiliary clamping rod are rotationally mounted on the clamping rod, so that the rim clamping device can be automatically attached to the edge of a rim when the rim is clamped, and the rim clamping device is suitable for rims of different specifications and stably clamps the rim; the included angle can be adjusted by the positioning rods according to the thickness of the rim flange, when the rim is clamped, the rim flange enters the position between the positioning rods, and rim weld joint dislocation during welding is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of rim welding fixtures, in particular to a small rim welding fixture. Background Art

[0002] In the manufacturing process of small wheel rims, welding is a key process, and its welding quality directly affects the performance and service life of the wheel rims. During welding, the wheel rims need to be accurately positioned and firmly clamped to ensure accurate weld position and stable welding process, thus obtaining high-quality wheel rims.

[0003] Traditionally, universal clamps are often used for small rim welding. Such clamps are not very adaptable when facing small rims of different shapes and sizes. On the one hand, it is difficult to quickly and accurately position and clamp rims of different specifications, resulting in low production efficiency; on the other hand, during the welding process, the rims are prone to displacement and shaking, and the welds are prone to misalignment, which seriously affects the welding quality and leads to an increase in scrap rate.

[0004] Although some special fixtures for small rims have solved the clamping problem of rims of specific specifications to a certain extent, they are not flexible enough. When it is necessary to produce small rims of various specifications, the fixtures have to be replaced frequently, which not only increases production costs but also further prolongs the production cycle.

[0005] In summary, developing a welding fixture that can quickly adapt to small rims of different specifications and has precise positioning and stable clamping functions has become an urgent problem to be solved in the current small rim production field. Summary of the invention

[0006] In view of the above problems, the present invention proposes a small rim welding fixture, the technical solution used is: A small wheel rim welding fixture comprises a chassis and a clamping device; The clamping device comprises a sliding block slidably mounted on the chassis, a sliding driving device for driving the sliding block to move, a lifting block, a lifting driving device for driving the lifting block to move, a rotating frame rotatably mounted on the lifting block, a rotating driving device for driving the rotating frame to rotate, and a plurality of supporting frames slidably mounted on the rotating frame; the supporting frames are provided with a plurality of groups of rim clamping assemblies, the rim clamping assemblies at both ends are provided with rim positioning assemblies, and the other rim clamping assemblies are provided with rim rotating assemblies; The wheel rim clamping assembly comprises a support rod fixedly mounted on the support frame, a mounting seat slidably and elastically mounted on the support rod, a clamping rod rotatably mounted on the mounting seat via a clamping rod rotating shaft, and a limiting rod rotatably mounted on the mounting seat at one end and slidably mounted on the support frame at the other end; the limiting rods are arranged in pairs and are disposed on both sides of the clamping rod rotating shaft; The rim positioning assembly includes a first secondary clamping rod that is arranged in pairs and disposed on both sides of the corresponding clamping rod, and is rotatably connected to the clamping rod through a first secondary clamping rod rotating shaft, a first limiting plate fixedly installed at the inner end of the corresponding support rod, a first limiting block slidably installed inside the corresponding clamping rod, whose inner end intermittently squeezes between the two first secondary clamping rod rotating shafts to stop the rotation of the first secondary clamping rod rotating shaft, and whose outer end intermittently contacts the first limiting plate, a positioning rod that is arranged in pairs and disposed on both sides of the first secondary clamping rod, and whose rod body is rotatably connected to the first secondary clamping rod, and an adjusting mechanism for adjusting the angle between the positioning rods.

[0007] Further, the adjusting mechanism includes a mounting block slidably and elastically installed on the first secondary clamping rod, and a bidirectional adjusting screw rod rotatably installed on the mounting block; a pair of sliders are provided on the bidirectional adjusting screw rod, and the outer ends of the positioning rods are rotatably installed on the sliders of the bidirectional adjusting screw rod.

[0008] Further, universal wheels are provided at the inner ends of the positioning rods.

[0009] Further, a rotating frame rotating shaft is fixedly provided on the rotating frame, and the rotating frame is rotatably installed on the lifting block through the rotating frame rotating shaft; the rotation driving device includes a worm gear coaxially and fixedly installed on the rotating frame rotating shaft, a worm rotatably installed on the lifting block and meshing with the worm gear, and a rotating motor installed on the lifting block and whose output end is used to drive the worm to rotate.

[0010] Further, a locking screw is threadedly installed at the sliding connection of the support frame and the rotating frame for fixing the support frame on the rotating frame.

[0011] Further, the rim rotating assembly includes a second secondary clamping rod that is arranged in pairs and disposed on both sides of the corresponding clamping rod, and is rotatably connected to the clamping rod through a second secondary clamping rod rotating shaft, a second limiting plate fixedly installed at the inner end of the corresponding support rod, a second limiting block slidably installed inside the corresponding clamping rod, whose inner end intermittently squeezes between the two second secondary clamping rod rotating shafts to stop the rotation of the second secondary clamping rod rotating shaft, and whose outer end intermittently contacts the second limiting plate, a rotating roller rotatably installed on the second secondary clamping rod, and a roller driving motor installed on the second secondary clamping rod and used to drive the rotating roller to rotate.

[0012] Further, rubber pads are provided at the innermost ends of the clamping rod, the first secondary clamping rod, and the second secondary clamping rod.

[0013] Further, a first rubber end is fixedly provided at the innermost end of the first limiting block, and the first rubber end can intermittently squeeze between the two first secondary clamping rod rotating shafts.

[0014] Further, a second rubber end is fixedly provided at the innermost end of the second limiting block, and the second rubber end can intermittently squeeze between the two second secondary clamping rod rotating shafts.

[0015] Due to the adoption of the above technical solutions in the present invention, the present invention has the following advantages: The clamping rod in the rim clamping assembly of the present invention is rotatably installed on the mounting seat, the secondary clamping rod one of the rim positioning assembly is rotatably installed on the clamping rod, and the secondary clamping rod two of the rim rotating assembly is rotatably installed on the clamping rod. This design of rotational connection can automatically fit the edge of the rim when clamping the rim, can adapt to rims of different specifications and stably clamp the rim. Moreover, the support frame moves freely driven by the moving driving device and the lifting driving device, and adapts to rims of different shapes and sizes by adjusting the position of the support frame, without the need to replace the fixture.

[0016] Rubber pads are provided at the innermost ends of the clamping rod, the secondary clamping rod one and the secondary clamping rod two. The rubber pads contact the rim, reducing scratches caused by direct friction between the rim and hard materials.

[0017] The positioning rod of the rim positioning assembly of the present invention can adjust the included angle according to the thickness of the rim flange. When clamping the rim, the rim flange enters between the positioning rods, and the positioning rods limit the rim to prevent the misalignment of the rim weld during welding. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the present invention with the chassis removed.

[0020] Figure 3 It is a schematic diagram of a partial structure of the clamping device of the present invention.

[0021] Figure 4 It is a schematic diagram of the assembly structure of the sliding block and the lifting driving device in the clamping device of the present invention.

[0022] Figure 5 It is a schematic diagram of the assembly structure of the rotary driving device, the rotary frame and the support frame in the clamping device of the present invention.

[0023] Figure 6 It is a schematic diagram of the assembly structure of the support frame, the rim clamping assembly, the rim positioning assembly and the rim rotating assembly of the present invention.

[0024] Figure 7 It is a front-down schematic diagram of the structure of the support frame of the present invention.

[0025] Figure 8 It is a front-up schematic diagram of the structure of the support frame of the present invention.

[0026] Figure 9 It is a schematic diagram of the assembly structure of the rim clamping assembly and the rim positioning assembly of the present invention.

[0027] Figure 10 For the present inventionFigure 9 Explosion schematic diagram of the middle structure.

[0028] Figure 11 Partial structure schematic diagram of the rim positioning component of the present invention.

[0029] Figure 12 Assembly structure schematic diagram of the mounting block, bidirectional adjustment screw rod, positioning rod and universal wheel of the rim positioning component of the present invention.

[0030] Figure 13 Assembly structure schematic diagram of the rim clamping component and the rim rotating component of the present invention.

[0031] Figure 14 For the present invention Figure 13 Explosion schematic diagram of the middle structure.

[0032] Figure 15 Partial structure schematic diagram of the rim rotating component of the present invention.

[0033] Reference numerals in the drawings: 1 - Chassis; 2 - Clamping device; 201 - Moving drive device; 202 - Slide block; 203 - Lifting drive device; 204 - Lifting block; 205 - Rotating drive device; 2051 - Rotating motor; 2052 - Worm; 2053 - Worm gear; 206 - Rotating frame; 207 - Support frame; 2071 - Locking screw; 2072 - Limit chute; 3 - Rim clamping component; 301 - Support rod; 302 - Mounting seat; 303 - Clamping rod; 304 - Limit rod; 4 - Rim positioning component; 401 - First auxiliary clamping rod; 402 - First limit block; 403 - First limit plate; 404 - Mounting block; 405 - Bidirectional adjustment screw rod; 406 - Positioning rod; 407 - Universal wheel; 5 - Rim rotating component; 501 - Second auxiliary clamping rod; 502 - Second limit block; 503 - Second limit plate; 504 - Rotating roller; 505 - Roller drive motor. Detailed implementation manners

[0034] The technical solutions of the present invention will be further specifically described below through embodiments in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "in", "out", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. Embodiment

[0036] This embodiment provides a fixture for welding small wheel rims, as Figures 1-6 shown, including a chassis 1, a clamping device 2, a wheel rim clamping assembly 3, a wheel rim positioning assembly 4, and a wheel rim rotating assembly 5; The clamping device 2 is arranged on the chassis 1 and includes a moving driving device 201, a sliding block 202, a lifting driving device 203, a lifting block 204, a rotating driving device 205, a rotating frame 206, and a support frame 207; A number of sliding blocks 202 are provided and are horizontally slidably installed on the chassis 1 and are driven to slide by the moving driving device 201; In this embodiment, the moving driving device 201 adopts a servo bidirectional lead screw and is installed on the chassis 1. Two sliding blocks 202 are provided and are driven by the moving driving device 201 to move towards each other; Each sliding block 202 is provided with a lifting block 204 driven to lift by the lifting driving device 203; As Figures 3-4 shown, the lifting driving device 203 includes a sleeve fixedly installed on the sliding block 202, a screw rod threadedly installed in the sleeve, and a lifting driving motor; The lifting driving motor is installed on the lifting block 204, and its output end drives two screw rods to rotate synchronously through a gear mechanism; Both screw rods are rotatably installed on the lifting block 204. When the screw rods rotate in the sleeve, the lifting block 204 moves up and down with the screw rods; As Figure 3 and Figure 5 shown, the rotating frame 206 is fixedly provided with a rotating frame rotating shaft and is rotatably installed on the lifting block 204 through the rotating frame rotating shaft; The rotating driving device 205 includes a rotating motor 2051, a worm 2052, and a worm gear 2053. The rotating motor 2051 is installed on the lifting block 204, and its output end is used to drive the worm 2052 to rotate. The worm 2052 is rotatably installed on the lifting block 204 and meshes with the worm gear 2053. The worm gear 2053 is coaxially and fixedly installed on the rotating frame rotating shaft; A input bevel gear is coaxially and fixedly installed on the output end of the rotating motor 2051, and an output bevel gear is coaxially and fixedly installed on the worm 2052. The input bevel gear and the output bevel gear mesh with each other; As Figures 5-6As shown, a number of support frames 207 are slidably provided on each rotary frame 206. In this embodiment, two support frames 207 are slidably provided on the rotary frame 206; the overall shape of the support frame 207 is an inwardly concave arc, and its outer side is slidably mounted on the rotary frame 206; a locking screw 2071 is threadedly mounted at the sliding connection of the support frame 207 and the rotary frame 206 for fixing the support frame 207 on the rotary frame 206; a number of groups of rim clamping assemblies 3 are provided along the inner arc on each support frame 207, rim positioning assemblies 4 are provided on the rim clamping assemblies 3 at both ends, and rim rotating assemblies 5 are provided on the other rim clamping assemblies 3; in this embodiment, five groups of rim clamping assemblies 3 are provided.

[0037] As Figures 6-15 shown, the rim clamping assembly 3 includes a support rod 301, a mounting seat 302, a clamping rod 303 and a limiting rod 304; the support rod 301 is fixedly mounted on the support frame 207 and is arranged radially; the mounting seat 302 is slidably penetrated through the support rod 301 and elastically mounted by a compression spring, and the inner end of the support rod 301 extends into the corresponding mounting seat 302; the clamping rod 303 is rotatably mounted on the mounting seat 302 through a clamping rod rotating shaft, and a rubber pad is provided at the innermost end of the clamping rod 303, and the rubber pad contacts the rim to reduce scratches caused by direct friction between the rim and the hard clamping rod 303; A pair of limiting rods 304 are provided, which are arranged on both sides of the clamping rod rotating shaft. One end of the limiting rod 304 is rotatably mounted on the mounting seat 302, and a pin shaft is provided at the other end. A curved limiting chute 2072 corresponding to the pin shaft of the limiting rod 304 is provided on the support frame 207, and the pin shaft is slidably mounted in the corresponding limiting chute 2072; when the mounting seat 302 slides outward relative to the support rod 301, the compression spring is compressed, the limiting rod 304 rotates, and the pin shaft on the limiting rod 304 moves in the limiting chute 2072, and the two limiting rods 304 clamp the clamping rod rotating shaft, so that the clamping rod 303 can no longer rotate; when the mounting seat 302 returns to its original position, the limiting rod 304 releases the clamping rod rotating shaft, and the clamping rod 303 can rotate; The rim positioning assembly 4 includes a secondary clamping rod one 401, a limiting block one 402, a limiting plate one 403, a mounting block 404, a bidirectional adjustment screw rod 405, a positioning rod 406 and a universal wheel 407; a pair of secondary clamping rods one 401 are provided, which are arranged on both sides of the corresponding clamping rod 303 and are rotatably connected to the inner end of the clamping rod 303 through a secondary clamping rod one rotating shaft; a rubber pad is provided at the innermost end of the secondary clamping rod one 401, and the rubber pad contacts the rim to reduce scratches caused by direct friction between the rim and the hard secondary clamping rod one 401; The first limiting plate 403 is fixedly installed at the innermost end of the corresponding support rod 301 and is located inside the mounting seat 302; the first limiting block 402 is slidably installed in the corresponding clamping rod 303, and a first rubber end is fixedly provided at the innermost end. The first rubber end can intermittently squeeze into the space between the rotating shafts of the two first sub-clamping rods, so that the two first sub-clamping rods 401 can no longer rotate; the outermost end of the first limiting block 402 extends out of the clamping rod 303 and intermittently contacts the first limiting plate 403; An installation block 404 is slidably installed on each first sub-clamping rod 401, and the installation block 404 is elastically connected to the inside of the first sub-clamping rod 401 through a tension spring; a vertically arranged bidirectional adjusting screw rod 405 is rotatably installed on the installation block 404, and two sliders sliding towards each other are provided on the bidirectional adjusting screw rod 405; a positioning rod 406 is provided on each of the upper and lower sides of the first sub-clamping rod 401. The outer end of the positioning rod 406 is rotatably installed on the slider of the bidirectional adjusting screw rod 405, the rod body is rotatably connected to the first sub-clamping rod 401, and a universal wheel 407 is provided at the inner end; manually rotate the bidirectional adjusting screw rod 405 to drive the slider thereon to drive the positioning rod 406 to rotate, so as to adjust the included angle between the two positioning rods 406; The rim rotating assembly 5 includes a second sub-clamping rod 501, a second limiting block 502, a second limiting plate 503, a rotating roller 504 and a rotating driving motor 505; a pair of second sub-clamping rods 501 are provided, which are arranged on both sides of the corresponding clamping rod 303 and are rotatably connected to the inner end of the clamping rod 303 through a second sub-clamping rod rotating shaft; a rubber pad is provided at the innermost end of the second sub-clamping rod 501, and the rubber pad contacts the rim to reduce scratches caused by direct friction between the rim and the hard second sub-clamping rod 501; The second limiting plate 503 is fixedly installed at the innermost end of the corresponding support rod 301 and is located inside the mounting seat 302; the second limiting block 502 is slidably installed in the corresponding clamping rod 303, and a second rubber end is fixedly provided at the innermost end. The second rubber end can intermittently squeeze into the space between the rotating shafts of the two second sub-clamping rods, so that the two second sub-clamping rods 501 can no longer rotate; the outermost end of the second limiting block 502 extends out of the clamping rod 303 and intermittently contacts the second limiting plate 503; A rotating roller 504 is rotatably installed in each second sub-clamping rod 501, and when the second sub-clamping rod 501 clamps the rim, the rotating roller 504 contacts the rim; the roller driving motor 505 is installed on the second sub-clamping rod 501, and the output end is coaxially and fixedly connected to the rotating roller 504.

[0038] The working principle of this embodiment is as follows: Preparation work: Start the lifting drive device 203 and adjust the height of the lifting block 204 according to the rim specifications. The two support frames 207 on the rotating frame 206 and the rim clamping assemblies 3 thereon are respectively used to clamp the two parts of the rim to be welded. Adjust the position of the support frame 207 according to the rim specifications. After adjustment, turn the locking screw 2071 to fix the support frame 207 on the rotating frame 206. Adjust the included angle between the positioning rods 406 according to the rim flange thickness. Manually rotate the bidirectional adjustment screw rod 405 so that the rim flange can enter between the positioning rods 406. The positioning rods 406 limit the rim to prevent the rim weld from being misaligned during welding. Clamping work: First, the external manipulator places the two parts of the rim to be welded in a joined posture between the rotating frames 206. Subsequently, start the moving drive device 201, the sliding block 202 moves, and the rim clamping assembly 3, the rim positioning assembly 4, and the rim rotating assembly 5 move closer to the rim. After the rim flange enters between the positioning rods 406, the clamping rod 303 of the rim clamping assembly 3 first contacts the rim flange. Since the clamping rod 303 is rotatably connected to the mounting seat 302, and the first secondary clamping rod 401 is rotatably connected to the clamping rod 303, and the second secondary clamping rod 501 is rotatably connected to the clamping rod 303, the clamping rod 303, the first secondary clamping rod 401, and the second secondary clamping rod 501 will gradually rotate to the state where the rubber pads are in contact with the rim flange. After the rubber pads are in close contact with the rim flange, when the sliding block 202 continues to move, it will push the clamping rod 303 in the reverse direction, and the mounting seat 302 moves outward relative to the support rod 301, and the limiting rod 304 clamps the clamping rod rotating shaft, making the clamping rod 303 no longer rotate. At the same time, the outer end of the first limiting block 402 in the rim positioning assembly 4 contacts the first limiting plate 403, and the first limiting plate 403 pushes the first limiting block 402 inward in the reverse direction. The rubber end of the inner end of the first limiting block 402 is squeezed between the rotating shafts of the two first secondary clamping rods 401, making the two first secondary clamping rods 401 no longer able to rotate. The outer end of the second limiting block 502 in the rim rotating assembly 5 contacts the second limiting plate 503, and the second limiting plate 503 pushes the second limiting block 502 inward in the reverse direction. The rubber end of the inner end of the second limiting block 502 is squeezed between the rotating shafts of the two second secondary clamping rods 501, making the two second secondary clamping rods 501 no longer able to rotate. As described above, the rim flange is clamped and the rim welds are aligned. The external manipulator releases the rim, and the external welding equipment welds the welds. During the welding process, start the roller drive motor 505, and the roller 504 starts to rotate, driving the rim to rotate until the entire rim weld is welded. During the rotation of the rim, the universal wheel 407 contacts the rim flange and reduces friction.

[0039] Final work: After welding is completed, select the corresponding cooling method according to the rim material, start the rotary motor 2051 to drive the worm 2052 to rotate, and the worm 2052 drives the worm wheel 2053 to rotate, thereby driving the rotary frame 206 to rotate, making the welded rim rotate and improving the cooling efficiency; After cooling is completed, the external manipulator fixes the rim, the moving drive device 201 drives the sliding block 202 to slide, the clamping rod 303, the first secondary clamping rod 401 and the second secondary clamping rod 501 release the rim, and the manipulator takes away the rim.

Claims

1. A fixture for small rim welding, characterized in that, It includes a chassis and a clamping device; The clamping device includes a sliding block slidably mounted on the chassis, a sliding drive device for driving the sliding block to move, a lifting block, a lifting drive device for driving the lifting block to move, a rotating frame rotatably mounted on the lifting block, a rotating drive device for driving the rotating frame to rotate, and several support frames slidably mounted on the rotating frame; several groups of rim clamping assemblies are provided on the support frames, rim positioning assemblies are provided on the rim clamping assemblies at both ends, and rim rotating assemblies are provided on the other rim clamping assemblies; The rim clamping assembly includes a support rod fixedly mounted on the support frame, a mounting seat slidably and elastically mounted on the support rod, a clamping rod rotatably mounted on the mounting seat through a clamping rod rotating shaft, and a limiting rod rotatably mounted at one end on the mounting seat and slidably mounted at the other end on the support frame; the limiting rods are arranged in pairs and are located on both sides of the clamping rod rotating shaft; The rim positioning assembly includes a first secondary clamping rod arranged in pairs and located on both sides of the corresponding clamping rod, rotatably connected to the clamping rod through a first secondary clamping rod rotating shaft, a first limiting plate fixedly mounted at the inner end of the corresponding support rod, a first limiting block slidably mounted inside the corresponding clamping rod, the inner end of which intermittently squeezes between the two first secondary clamping rod rotating shafts to stop the rotation of the first secondary clamping rod rotating shaft, and the outer end of which intermittently contacts the first limiting plate, positioning rods arranged in pairs and located on both sides of the first secondary clamping rod, with the rod bodies rotatably connected to the first secondary clamping rod, and an adjusting mechanism for adjusting the angle between the positioning rods.

2. The fixture for small rim welding according to claim 1, characterized in that, The adjusting mechanism includes a mounting block slidably and elastically mounted on the first secondary clamping rod, and a bidirectional adjusting screw rod rotatably mounted on the mounting block; pairs of sliders are provided on the bidirectional adjusting screw rod, and the outer ends of the positioning rods are rotatably mounted on the sliders of the bidirectional adjusting screw rod.

3. The fixture for welding a small rim according to claim 1, wherein, Universal wheels are provided at the inner ends of the positioning rods.

4. The fixture for welding a small rim according to claim 1, wherein, A rotating frame rotating shaft is fixedly provided on the rotating frame and is rotatably mounted on the lifting block through the rotating frame rotating shaft; the rotating drive device includes a worm gear coaxially and fixedly mounted on the rotating frame rotating shaft, a worm rotatably mounted on the lifting block and meshing with the worm gear, and a rotating motor mounted on the lifting block and the output end of which is used to drive the worm to rotate.

5. The fixture for welding a small rim according to claim 1, characterized in that, Locking screws are threadedly mounted at the sliding connection of the support frame and the rotating frame for fixing the support frame on the rotating frame.

6. The fixture for welding a small rim according to claim 1, characterized in that, The rim rotating assembly includes a second secondary clamping rod arranged in pairs and located on both sides of the corresponding clamping rod, rotatably connected to the clamping rod through a second secondary clamping rod rotating shaft, a second limiting plate fixedly mounted at the inner end of the corresponding support rod, a second limiting block slidably mounted inside the corresponding clamping rod, the inner end of which intermittently squeezes between the two second secondary clamping rod rotating shafts to stop the rotation of the second secondary clamping rod rotating shaft, and the outer end of which intermittently contacts the second limiting plate, a rotating roller rotatably mounted on the second secondary clamping rod, and a roller drive motor mounted on the second secondary clamping rod for driving the rotating roller to rotate.

7. The fixture for welding a small rim according to claim 6, wherein, Rubber pads are provided at the innermost ends of the clamping rod, the first secondary clamping rod, and the second secondary clamping rod.

8. The fixture for welding a small rim according to claim 1, wherein, A rubber end head one is fixedly provided at the innermost end of the first limiting block, and the rubber end head one can intermittently squeeze between the two first secondary clamping rod rotating shafts.

9. The fixture for welding a small rim according to claim 6, characterized in that, The innermost end of the second limiting block is fixedly provided with a second rubber end head, and the second rubber end head can intermittently squeeze into the space between the rotating shafts of the two second auxiliary clamping rods.

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