A clamping aid for welding

Abstract

The application discloses a clamping auxiliary device for welding, which comprises a first clamping part for clamping a Venturi cone pipe and a second clamping part for clamping a circular pipe. The first, second and third sliding blocks are annular or arc-shaped. The annular inner wall of the sliding block matches and is attached to the conical surface / cylindrical surface to be clamped. Compared with the three-point contact of the three-jaw chuck in the prior art, the conical surface / cylindrical surface of the annular inner wall of the sliding block is in contact with the curved surface of the clamped workpiece, the contact area is larger, the circular conical surface and cylindrical surface can uniformly distribute stress, when force is applied at one point, the force will be transmitted to both sides along the tangent direction of the circle, and finally dispersed to the whole structure. The pressure distribution of the clamped workpiece is more uniform, the clamping stability is better, the risk of local cracking is smaller, the finished product quality of the Venturi pipe is better, and the service life is longer.

Description

Technical Field

[0001] This invention relates to the field of venturi tube welding technology for agricultural vehicles, and more specifically, to a clamping auxiliary device for welding. Background Technology

[0002] Agricultural machinery, such as the fuel systems, exhaust gas recirculation systems, or pesticide / liquid fertilizer spraying systems of older gasoline engines, often incorporates venturi tubes. These systems operate under varied and complex conditions, with varying fuel / medium quality, requiring high reliability in venturi mixing. Therefore, existing technologies often incorporate mechanical structures inside the venturi tube to improve mixing efficiency. For example, patent document CN206577612U discloses a venturi mixer that adds helical blades inside the throat.

[0003] These types of Venturi structures are small in size, and machining the inner bore is difficult. Therefore, the helical blades are often manufactured separately and then welded into the throat. However, due to the small size of the Venturi structure and the throat being located deep within the pipe cavity, it is difficult to machine. Therefore, the throat needs to be fabricated separately, the helical blades welded into the throat, and then the throat coaxially welded to the tapered tubes at both ends, as well as the round tubes at both ends of the tapered tubes. However, existing welding clamping fixtures typically use three-jaw chucks for direct clamping, resulting in a small contact area. This necessitates increasing the clamping force to ensure the stability of the workpiece during welding, which can lead to excessive local pressure at three points, increasing the risk of workpiece cracking and shortened service life.

[0004] Therefore, how to provide a welding clamping and fixing fixture with a larger contact area and a more uniform pressure distribution in the clamped area has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a clamping auxiliary device for welding to solve the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A welding clamping auxiliary device, comprising: First clamping member and second clamping member; Both the first and second clamping members include an annular mounting portion. An annular track is provided on the radially outer side of the mounting portion. An arc-shaped revolving slider is provided in the annular track and slides in annularly within the annular track. The mounting portion is also provided with a planetary gear set. The central gear axis of the planetary gear set coincides with the annular axis of the mounting portion and the axis of the annular track. The planetary gears of the planetary gear set are coaxially hinged to a first pull rod. The first pull rod of the first / second clamping member is detachably connected to the first pull rod of the other first / second clamping member. The extension direction of the first pull rod is consistent with the axial direction of the mounting portion. Along the radial direction of the mounting portion, the revolving slider is close to the radially outer side of the mounting portion, and the planetary gear is close to the radially inner side of the mounting portion. The revolving slider and the planetary gear are connected to revolve synchronously. The annular inner wall of the mounting part is provided with a first guide rail and a second guide rail. The first and second guide rails are distributed adjacent to each other along the axial direction of the mounting part, and are coaxial frustoconical tracks with opposite cone directions. Both are coaxial with the mounting part, and the thicker ends of the frustoconical tracks face each other. A ring-shaped or arc-shaped first slider is slidably connected in the first guide rail of the first clamping member. Its radial outer surface matches the first guide rail and slides in the first guide rail along the generatrix of the frustoconical track. Its radial inner surface faces the workpiece being clamped and matches the clamped cone surface. A ring-shaped or arc-shaped second slider is slidably connected in the second guide rail of the first clamping member. Its radial outer surface matches the first guide rail and slides in the second guide rail along the generatrix of the frustoconical track. Its radial inner surface faces the workpiece being clamped and matches the clamped cone surface. Oriented towards the workpiece being clamped and matching the clamped conical surface, the first guide rail and the second guide rail of the second clamping member are connected at their frustum-shaped thick ends. A ring-shaped or arc-shaped third slider is provided at the connection point. In the second clamping member, the radial outer wall of one axial end of the third slider matches and slides with the first guide rail, so that the third slider can slide into the first guide rail from the connection point and slide along the frustum-shaped generatrix of the rail wall in the first guide rail. The radial outer wall of the other axial end of the slider matches and slides with the second guide rail, so that the third slider can slide into the second guide rail from the connection point and slide along the frustum-shaped generatrix of the rail wall in the second guide rail. The radial inner wall of the third slider matches and fits the cylindrical surface of the clamped tube. A first spring is connected to one end of the first guide rail along its axial direction. The other end of the elastic spring is connected to the first / third slider corresponding to the first rail. A second spring is connected to one end of the second guide rail along its axial direction. The other end of the elastic spring is connected to the second / third slider corresponding to the second rail. The elastic direction of the first and second springs is along the generatrix direction of the frustum-shaped rails at that location. The first and second sliders are squeezed to bring them closer to each other. The elastic extension of the first and second springs allows the inner diameter of the enclosed area of ​​the first and second sliders to be greater than or equal to the maximum outer diameter of the clamped tapered tube. In the natural extension and contraction state of the first and second springs, the first and second sliders are located in the axial middle of the frustum-shaped rails, and their radial inner walls are in contact with the clamped tapered tube.

[0007] Optionally, the frustum taper of the first track is greater than or equal to the frustum taper of the second track.

[0008] Optionally, the planetary gear set has two or more planetary gears that revolve around the same central gear. The two or more planetary gears are circumferentially distributed around the axis of the central gear. The number of the revolving slider is the same as that of the planetary gears and they are connected one-to-one. The revolving slider has a connecting member on the outer side along the radial direction of the revolving wheel. The connecting member passes through the outer wall of the annular track. The outer wall of the annular track has an opening for the connecting member to pass through and revolve synchronously. The two or more connecting members are circumferentially distributed around the axis of the central gear. The end of the connecting member that passes through has a groove for the elastic ring to be fitted. The elastic ring is fitted on the groove of the two or more connecting members. The elastic ring is coaxial with the central gear. There is a rotational gap between the elastic ring and its corresponding mounting part. It rotates synchronously with the revolving slider connected to it.

[0009] Optionally, the mounting portion of the first clamping member includes a first base, a second base, and a third base. The first base is provided with a first track, the second track is provided with a second track, and the third track is annular. The first and second bases are fitted inside the annular portion of the third base and are detachably connected to the third base.

[0010] Optionally, a first spring is connected to the frustum-shaped thin end of the first guide rail, and the other end of the elastic spring is connected to the first / third slider corresponding to the first rail. A second spring is connected to the frustum-shaped thin end of the second guide rail, and the other end of the elastic spring is connected to the second / third slider corresponding to the second rail.

[0011] This invention utilizes annular or arc-shaped first, second, and third sliders. The inner wall of the slider's annular shape matches and conforms to the conical / cylindrical surface to be clamped. Compared to the three-point contact of existing three-jaw chucks, the conical / cylindrical surface of the slider's annular inner wall contacts the arc-shaped surface of the workpiece being clamped, resulting in a larger contact area. The circular shape of the conical and cylindrical surfaces allows for uniform stress distribution. When force is applied in one area, it is transmitted to both sides along the tangent of the circle, ultimately dispersing throughout the entire structure. This results in a more uniform pressure distribution on the clamped workpiece, better clamping stability, a lower risk of localized cracking, better finished quality of the venturi tube, and a longer service life. Attached Figure Description

[0012] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the structure of a welding clamping auxiliary device provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a welding clamping auxiliary device provided in an embodiment of this application; Figure 3 for Figure 2 A schematic diagram of the welding clamping auxiliary device in the clamping state according to the embodiment; Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 for Figure 3 A magnified view of a portion of the image; Figure 6 for Figure 3 A schematic diagram of the structure after the first and second springs return to their natural extension / retraction state following clamping; Figure 7 A schematic diagram of a welding clamping auxiliary device for clamping a venturi tube and an upstream circular tube for welding the two; Figure 8 A schematic diagram of a welding clamping auxiliary device for clamping a venturi tube and a downstream circular tube for welding the two. Figure 9 This is a partial structural schematic diagram of a welding clamping auxiliary device provided in an embodiment of this application; Figure 10 for Figure 9 A schematic diagram of the disassembled structure after removing the third base in the embodiment.

[0013] Reference numerals: 100, first clamping member; 200, second clamping member; 310, center wheel; 320, planetary wheel; 330, orbiting slider; 340, circular track; 350, connecting member; 360, elastic ring; 400, first guide rail; 410, first slider; 420, first spring; 500, second guide rail; 510, second slider; 520, second spring; 600, third slider; 700, first pull rod; 800, bolt. Detailed Implementation

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] This invention provides a welding clamping auxiliary device, comprising a first clamping member 100 and a second clamping member 200. Wherein: Both the first and second clamping members 200 include an annular mounting portion. An annular track 340 is provided on the radially outer side of the mounting portion. An arc-shaped revolving slider 330 is provided in the annular track 340, which slides in annularly within the annular track 340. The mounting portion is also provided with a planetary gear set. The axis of the central wheel 310 of the planetary gear set coincides with the annular axis of the mounting portion and the axis of the annular track 340. The planetary gears 320 of the planetary gear set are coaxially hinged to a first pull rod 700. The first pull rod 700 of the first / second clamping member 200 is detachably connected to the first pull rod 700 of the other first / second clamping member 200. The extension direction of the first pull rod 700 is consistent with the axial direction of the mounting portion. Along the radial direction of the mounting portion, the revolving slider 330 is close to the radially outer side of the mounting portion, and the planetary gear 320 is close to the radially inner side of the mounting portion. The revolving slider 330 and the planetary gear 320 are connected to revolve synchronously. The annular inner wall of the mounting part is provided with a first guide rail 400 and a second guide rail 500. The first and second guide rails 500 are distributed adjacent to each other along the axial direction of the mounting part. They are coaxial frustum-shaped tracks with opposite cone directions, both coaxial with the mounting part, and the thicker ends of the frustums face each other. A ring-shaped or arc-shaped first slider 410 is slidably connected in the first guide rail 400 of the first clamping member 100. Its radial outer surface matches the first guide rail 400 and slides in the first guide rail 400 along the generatrix direction of the frustum. Its radial inner surface faces the clamped workpiece and matches the clamped cone surface. A ring-shaped or arc-shaped second slider 510 is slidably connected in the second guide rail 500 of the first clamping member 100. Its radial outer surface matches the first guide rail 400 and slides in the second guide rail 500 along the generatrix direction of the frustum. Its radial inner surface faces the clamped workpiece. The workpiece is clamped and matched with the clamped conical surface. The first guide rail 400 and the second guide rail 500 of the second clamping member 200 are connected at their thick frustum-shaped ends. A ring-shaped or arc-shaped third slider 600 is provided at the connection point. In the second clamping member 200, the radial outer wall of one axial end of the third slider 600 matches and slides with the first guide rail 400, so that the third slider 600 can slide into the first guide rail 400 from the connection point and slide along the frustum-shaped generatrix of the rail wall in the first guide rail 400. The radial outer wall of the other axial end of the slider matches and slides with the second guide rail 500, so that the third slider 600 can slide into the second guide rail 500 from the connection point and slide along the frustum-shaped generatrix of the rail wall in the second guide rail 500. The radial inner wall of the third slider 600 matches and fits with the cylindrical surface of the clamped tube. A first spring 420 is connected to one end of the first guide rail 400 along its axial direction. The other end of the elastic spring 420 is connected to the first / third slider 600 corresponding to the first track. A second spring 520 is connected to one end of the second guide rail 500 along its axial direction. The other end of the elastic spring 520 is connected to the second / third slider 600 corresponding to the second track. The elastic direction of the first and second springs 520 is along the generatrix direction of the frustum-shaped track at that location. They compress the first and second sliders 510 to bring them closer to each other. The elastic extension of the first and second springs 520 allows the inner diameter of the enclosed area of ​​the first and second sliders 510 to be greater than or equal to the maximum outer diameter of the clamped tapered tube. In the natural extension and contraction state of the first and second springs 520, the first and second sliders 510 are located in the axial middle of the frustum-shaped track, and their radial inner sidewalls are in contact with the clamped tapered tube.

[0016] This invention utilizes annular or arc-shaped first, second, and third sliders 600. The annular inner wall of the slider matches and fits the conical / cylindrical surface to be clamped. Compared to the three-point contact of existing three-jaw chucks, the conical / cylindrical surface of the slider's annular inner wall contacts the arc surface of the workpiece being clamped, resulting in a larger contact area. The circular shape of the conical and cylindrical surfaces allows for uniform stress distribution. When force is applied in one area, it is transmitted to both sides along the tangent of the circle, ultimately dispersing throughout the entire structure. This results in a more uniform pressure distribution on the clamped workpiece, better clamping stability, a lower risk of localized cracking, better finished quality of the venturi tube, and a longer service life.

[0017] Furthermore, both the first and second guide rails 500 are damping slide rails. This invention, by setting the first guide rail 400 and the second guide rail 500 for axial limiting, can prevent axial displacement of the two workpieces during welding, thus preventing impact on welding quality and reducing the finished quality of the venturi tube. If the tapered tube experiences axial displacement due to force during welding, friction is generated at the contact surfaces of the workpiece and the first and second sliders 510, causing synchronous axial displacement with the workpiece. Figure 3For example, when the workpiece tends to move axially to the left, the first slider 410 and the second slider 510 move axially synchronously with it. The sliding resistance of the first slider 410 in the first guide rail 400 restricts its leftward movement, thus limiting the workpiece's leftward movement. The same applies to the second slider 510. Even if axial displacement is achieved by overcoming static friction, the first slider 410 moves synchronously, and under the guidance of the first guide rail 400 and the constraint of the rail wall, it gets closer and closer to the workpiece, squeezing it and applying greater pressure and static friction. The first spring 420 is compressed, and the resulting elastic force also prevents the workpiece from moving further to the left. The leftward movement of the second slider 510 causes the second spring 520 to extend, and the resulting elastic force also prevents the workpiece from moving further to the left. Therefore, the axial displacement of the workpiece is restricted, maintaining relative stability during welding and ensuring the quality of the finished product. The mechanism of workpiece leftward movement is similar. Regarding the third slider 600, if the workpiece moves to the left, the third slider 600 moves to the left, and the sliding resistance in the first guide rail 400 restricts the workpiece's leftward movement. Even if the workpiece overcomes the static friction and moves to the left, under the guidance of the first guide rail 400, the leftward movement of the third slider 600 will inevitably be accompanied by radial inward movement, squeezing the clamped workpiece, applying stronger pressure, increasing friction, and the elastic force generated by the compression and shortening of the first spring 420 and the elastic force generated by the stretching and lengthening of the second spring 520 both limit the further leftward movement of the workpiece and provide assistance for the reset of the third slider 600. The mechanism of the rightward movement of the third slider 600 is similar.

[0018] In one possible implementation, to achieve a close fit with the clamped tapered tube, the annular inner walls of the first slider 410 and the second slider 510 are frustum-shaped structures with the same cone direction and cone angle. Along the axial direction of the clamped tapered tube, the first track is closer to the cone tip of the clamped tapered tube, and the second track is farther away from the cone tip of the clamped tapered tube. It should be noted that the term "tapered tube" in this application is a common industry term for a frustum-shaped tapered tube. The tube represents an opening at both ends along the axial direction, so the actual pipe structure must be a frustum-shaped pipe, and cannot be understood as a physical tapered structure with a closed cone tip. The aforementioned "cone tip" is a virtual cone tip of the virtual tapered structure in which the frustum-shaped physical pipe (the clamped tapered tube to be welded) is located, and cannot be understood as an actual closed cone tip. The frustum taper of the first track is greater than or equal to the frustum taper of the second track. Under the premise of ensuring that the inner diameter of the enclosed space on the radial inner side of the slider within the elastic deformation range of the first and second springs 520 is greater than the maximum outer diameter of the clamped tapered tube, it is preferable that the former is greater than the latter.

[0019] In one possible implementation, the planetary gear set has two or more planetary gears 320 that revolve around the same central gear 310. The two or more planetary gears 320 are circumferentially distributed around the axis of the central gear 310. The number of revolving sliders 330 is the same as that of the planetary gears 320 and they are connected one-to-one. The outer side of the revolving slider 330 is provided with a connector 350 along the radial direction of the revolving axis. The connector 350 extends out of the annular outer wall of the annular track 340. The annular outer wall of the annular track 340 is provided with an opening for the connector 350 to pass through and revolve synchronously. The two or more connectors 350 are circumferentially distributed around the axis of the central gear 310. The end of the connector 350 that extends through is provided with a through groove for the elastic ring 360 to be fitted. The elastic ring 360 is fitted on the through groove of the two or more connectors 350. The elastic ring 360 is coaxial with the central gear 310. There is a rotational gap between the elastic ring 360 and its corresponding mounting part, and it rotates synchronously with the revolving slider 330 connected to it. An inward force is applied radially to the planetary gears, causing them to automatically engage with the central gear 310 and press against it, thus locking the planetary gears 320 and preventing them from rotating freely. During welding, the first pull rod 700 pre-tightens the axial ends of the two workpieces, forcing them to be axially close together. When welding two workpieces in a ring, the first pull rod 700 is located radially outside the weld seam. If the circumferential welding reaches a blocked position, the first pull rod 700 can be rotated by hand, causing the planetary gears 320 to passively rotate around the central gear 310. The rotating slider 330, connecting piece 350, and elastic ring 360 rotate synchronously, exposing the blocked weld seam and facilitating welding. When pulled, the elastic element extends circumferentially to fit the outer edge of the connecting piece 350, providing the radial clearance required for the planetary gears 320 to rotate around the central gear 310.

[0020] In one possible implementation, the mounting portion of the first clamping member 100 includes a first base, a second base, and a third base. The first base has a first track, the second track has a second track, and the third track is annular. The first and second bases are fitted inside the annular portion of the third base and are detachably connected to the third base via bolts 800. Additionally, the first pull rod 700 is also connected to the planetary gear 320 via bolts 800, for example... Figure 3 As shown in the embodiment, one end of the first pull rod 700 is L-shaped. One side of the L-shape forms the rod-like main body of the first pull rod 700, and the other side is attached to the connector 350 and detachably connected by bolts 800. A connecting shaft is rotatably connected to the axial opening of the planetary gear 320 via bearings. The connecting shaft rotates around the axis of the planetary gear 320 at the axial center of the planetary gear 320 and extends out of the planetary gear 320. The connector 350 is fixed to the extended end of the connecting shaft. In other words, one end of the first pull rod 700 is indirectly and detachably connected to the planetary gear 320 via bolts 800 and connector 350.

[0021] Optionally, a first spring 420 is connected to the frustum-shaped thin end of the first guide rail 400, and the other elastic end of the first spring 420 is connected to the first / third slider 600 corresponding to the first track. A second spring 520 is connected to the frustum-shaped thin end of the second guide rail 500, and the other elastic end of the second spring 520 is connected to the second / third slider 600 corresponding to the second track.

[0022] In one possible implementation, two workpieces to be welded are connected by a first / second clamping member 200. The number of first pull rods 700 corresponding to the clamping members of the two workpieces is the same, and they are arranged opposite each other along the axial direction of the mounting part and are detachably connected. Optionally, the end of the first pull rod 700 extending out of the body length of the first / second clamping member 200 is provided with a thread. The first pull rods 700 of the clamping members of the two workpieces are detachably connected by a screw, and the screwing depth is adjusted according to different axial lengths to implement axial pre-tightening.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping auxiliary device for welding, characterized in that, include: First clamping member and second clamping member; Both the first and second clamping members include an annular mounting portion. An annular track is provided on the radially outer side of the mounting portion. An arc-shaped revolving slider is provided in the annular track and slides in annularly within the track. The mounting portion also includes a planetary gear set. The central gear axis of the planetary gear set coincides with the annular axis of the mounting portion and the axis of the annular track. The planetary gears of the planetary gear set are coaxially hinged to a first pull rod. The first pull rod of the first / second clamping member is detachably connected to the first pull rod of the other first / second clamping member. The extension direction of the first pull rod is consistent with the axial direction of the mounting portion and along the radial direction of the mounting portion. The revolving slider is close to the radially outer side of the mounting portion, and the planetary gear is close to the radially inner side of the mounting portion. The revolving slider and the planetary gear are connected to revolve synchronously. The mounting portion has a first guide rail and a second guide rail on its annular inner wall. The first and second guide rails are adjacent to each other along the axial direction of the mounting portion and are coaxial frustoconical tracks with opposite cone directions. They are both coaxial with the mounting portion, and the thicker ends of the frustoconical tracks face each other. A ring-shaped or arc-shaped first slider is slidably connected to the first guide rail of the first clamping member. Its radial outer surface matches the first guide rail and slides along the generatrix of the frustoconical track in the first guide rail. Its radial inner surface faces the workpiece being clamped and matches the clamped cone surface. A ring-shaped or arc-shaped second slider is slidably connected to the second guide rail of the first clamping member. Its radial outer surface matches the first guide rail and slides along the generatrix of the frustoconical track in the second guide rail. Its radial inner surface faces the workpiece being clamped and matches the clamped cone surface. Oriented towards the workpiece being clamped and matching the clamped conical surface, the first guide rail and the second guide rail of the second clamping member are connected at their frustum-shaped thick ends. A ring-shaped or arc-shaped third slider is provided at the connection point. In the second clamping member, the radial outer wall of one axial end of the third slider matches and slides with the first guide rail, so that the third slider can slide into the first guide rail from the connection point and slide along the frustum-shaped generatrix of the rail wall in the first guide rail. The radial outer wall of the other axial end of the slider matches and slides with the second guide rail, so that the third slider can slide into the second guide rail from the connection point and slide along the frustum-shaped generatrix of the rail wall in the second guide rail. The radial inner wall of the third slider matches and fits the cylindrical surface of the clamped tube. A first spring is connected to one end of the first guide rail along its axial direction. The other end of the elastic spring is connected to the first / third slider corresponding to the first rail. A second spring is connected to one end of the second guide rail along its axial direction. The other end of the elastic spring is connected to the second / third slider corresponding to the second rail. The elastic direction of the first and second springs is along the generatrix direction of the frustum-shaped rails at that location. The first and second sliders are squeezed to bring them closer together. The elastic extension of the first and second springs allows the inner diameter of the enclosed area of ​​the first and second sliders to be greater than or equal to the maximum outer diameter of the clamped tapered tube. In the natural extension and contraction state of the first and second springs, the first and second sliders are located in the axial middle of the frustum-shaped rails, and their radial inner sidewalls are in contact with the clamped tapered tube.

2. The welding clamping auxiliary device according to claim 1, characterized in that, Along the axial direction of the clamped tapered tube, the first track is closer to the tip of the tapered tube, and the second track is farther from the tip of the tapered tube. The frustum taper of the first track is greater than or equal to the frustum taper of the second track.

3. The welding clamping auxiliary device according to claim 1, characterized in that, The planetary gear set has two or more planetary gears that revolve around the same central gear. The two or more planetary gears are circumferentially distributed around the axis of the central gear. The number of the revolving sliders is the same as the number of planetary gears and they are connected one-to-one. The revolving sliders have connecting members on the outer side along the radial direction of the revolution. The connecting members protrude through the annular outer wall of the annular track. The annular outer wall of the annular track has an opening for the connecting members to pass through and revolve synchronously. The two or more connecting members are circumferentially distributed around the axis of the central gear. The protruding end of the connecting member has a through groove for an elastic ring to be fitted. The elastic ring is fitted on the through groove of the two or more connecting members. The elastic ring is coaxial with the central gear. There is a rotational gap between the elastic ring and its corresponding mounting part, and it rotates synchronously with the revolving slider connected to it.

4. The welding clamping auxiliary device according to claim 1, characterized in that, The mounting portion of the first clamping member includes a first base, a second base, and a third base. The first base is provided with a first track, the second track is provided with a second track, and the third track is annular. The first and second bases are fitted inside the annular portion of the third base and are detachably connected to the third base.

5. The welding clamping auxiliary device according to claim 1, characterized in that, The first guide rail has a frustum-shaped thin end connected to a first spring, and the other end of the elastic spring is connected to the first / third slider corresponding to the first rail. The second guide rail has a frustum-shaped thin end connected to a second spring, and the other end of the elastic spring is connected to the second / third slider corresponding to the second rail.

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