Self-adaptive welding clamp for automobile parts

Abstract

The invention relates to the field of automobile part welding, in particular to a self-adaptive welding clamp for automobile parts. A self-adaptive welding clamp for automobile parts comprises an adjusting platform, a mounting seat, a rotating mechanism, a horizontal moving mechanism and the like. Mounting bases are mounted on the left side and the right side of the top of the adjusting platform correspondingly, the mounting bases can change left and right positions on the top of the adjusting platform, rotating mechanisms are mounted in the middles of the mounting bases correspondingly, the rotating end of the rotating mechanism on the left side is connected with an inward-outward fixing mechanism, and the inward-outward fixing mechanism fixes a workpiece from inside to outside; the rotating end of the rotating mechanism on the right side is connected with an outward-inward fixing mechanism. Through the adjusting platform, the mounting position of the clamp can be adjusted, so that the clamp can be mounted at the optimal position for welding work, and meanwhile, the mounting error-tolerant rate and the universality of the clamp are improved; through cooperation of the rotating mechanism and the horizontal moving mechanism, any position of the workpiece can be moved to the welding position for welding.

Description

Technical Field

[0001] This invention relates to the field of automotive parts welding, and more particularly to an adaptive welding fixture for automotive parts. Background Technology

[0002] In automobile manufacturing and repair, welding is one of the key processes for connecting various metal parts. To ensure welding quality, improve assembly accuracy, and increase production efficiency, specialized fixtures are usually required to accurately position and reliably fix the parts to be welded. Especially when dealing with tubular automotive parts with complex geometries or different sizes, such as exhaust pipes and drive shafts, traditional welding fixtures often struggle to balance versatility and clamping stability.

[0003] In existing technologies, some welding fixtures adopt a rigid structure design, which is only suitable for workpieces of specific sizes or shapes. Once the specifications of the parts change, the entire set of fixtures needs to be replaced, which not only increases equipment costs but also reduces the flexibility of the production line. In addition, for welding scenarios involving curved pipes or multi-section combined pipe fittings, traditional fixtures lack the ability to dynamically adjust their spatial posture (such as angle and height), leading to frequent problems such as improper clamping, weld misalignment, and even welding failure.

[0004] Chinese patent CN117001263B discloses a welding fixture for automotive parts. By setting up a first clamping mechanism (for clamping the inner wall of the pipe) and a second clamping mechanism (for clamping the outer wall), combined with a pulling component, a rotating component, and a lifting component, it can adapt to pipes of different lengths and curvatures to a certain extent. However, this device is mainly designed for specific types of tubular structures, and its "adaptive" capability is still limited to preset mechanical linkage logic, lacking universality for non-tubular or irregularly shaped automotive parts (such as brackets, flanges, and irregularly shaped shells).

[0005] Therefore, there is an urgent need to develop an adaptive welding fixture for automotive parts. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides an adaptive welding fixture for automotive parts.

[0007] The technical solution of this invention is: an adaptive welding fixture for automotive parts, comprising an adjustment platform, a mounting base, a rotating mechanism, a horizontal moving mechanism, an inward-outward fixing mechanism, and an outward-inward fixing mechanism. Mounting bases are installed on both the left and right sides of the top of the adjustment platform. The mounting bases can change their left and right positions on the top of the adjustment platform. A rotating mechanism is installed in the middle of each mounting base. The rotating end of the left rotating mechanism is connected to the inward-outward fixing mechanism, which fixes the workpiece from the inside out. The rotating end of the right rotating mechanism is connected to the outward-inward fixing mechanism, which fixes the workpiece from the outside in. Both the inward-outward and outward-inward fixing mechanisms can fix workpieces of different sizes. A horizontal moving mechanism is provided on each mounting base, which can drive the inward-outward and outward-inward fixing mechanisms to change their left and right positions.

[0008] As a further preferred embodiment, the adjustment platform includes a clamp mounting plate with multiple T-shaped grooves on the top, each T-shaped groove being slidably connected to a T-shaped bolt, which passes upward through a mounting seat above it and is connected to a clamping nut by threads.

[0009] As a further preferred embodiment, the rotating mechanism includes a first motor mounted on the side of the mounting base and a sleeve rotatably mounted in the middle of the mounting base. A transmission belt assembly is connected between the sleeve and the output shaft of the first motor, and a keyed transmission shaft is slidably mounted inside the sleeve.

[0010] As a further preferred embodiment, the horizontal moving mechanism includes a hydraulic cylinder mounted on the top of the mounting base. A connecting plate is provided on the mounting base below the hydraulic cylinder. A hinge rod is rotatably mounted on the end of the connecting plate. The hinge rod has oblong holes at its upper and lower parts. An adapter is rotatably mounted on the telescopic end of the hydraulic cylinder and the left end of the keyed drive shaft. A retaining shaft is provided on the adapter, and the retaining shaft is slidably connected to the oblong holes on the upper and lower sides.

[0011] As a further preferred embodiment, the inward-outward fixing mechanism includes a fixing structure for fixing the workpiece and a first driving mechanism for driving the fixing structure to work.

[0012] As a further preferred embodiment, the fixing structure includes a hollow cylinder mounted on the right end of the keyed drive shaft on the left side. A first mounting plate is fixedly connected to the right side of the hollow cylinder. A first sliding groove is provided radially on the right side surface of the first mounting plate. A first stepped claw is slidably connected in each of the first sliding grooves. The thickness of the first stepped claw decreases from the inside to the outside. The inner end face of the first stepped claw is an upwardly inclined surface. A first spring is connected between the first stepped claw and the first mounting plate. A sliding rod is slidably connected inside the hollow cylinder. A ring of wedge-shaped blocks, the same number as the first stepped claws, is provided at the right end of the sliding rod. The inclined surface of the wedge blocks fits against the inclined surface of the first stepped claws. A ring of slotted holes is provided axially on the hollow cylinder. A ring of connecting rods is provided radially on the outer surface of the sliding rod. The connecting rods pass through the slotted holes and are connected to a connecting ring.

[0013] As a further preferred embodiment, the first drive mechanism includes a first sliding mounting plate slidably connected to the left mounting seat via a first guide shaft. A second motor is mounted on the first sliding mounting plate, and a lead screw is connected to the output shaft of the second motor. The end of the lead screw is rotatably and slidably connected to the first mounting plate. A guide rod is fixedly connected to the upper part of the first sliding mounting plate, and the end of the guide rod is rotatably and slidably connected to the first mounting plate. A push plate is slidably connected to the guide rod, and the push plate is rotatably connected to the right side of the connecting ring. The lower part of the push plate is threadedly connected to the lead screw, and a ring of ball bearings is rotatably disposed on the contact surface between the push plate and the connecting ring.

[0014] As a further preferred embodiment, the outward-to-inward fixing mechanism includes a clamping mechanism for clamping the workpiece and a second driving mechanism for driving the clamping mechanism to work.

[0015] As a further preferred embodiment, the clamping mechanism includes a second mounting plate installed on the left end of the keyed drive shaft on the right side. A second sliding groove is provided radially on the left side of the second mounting plate. A second stepped claw is slidably connected in each of the second sliding grooves. The thickness of the second stepped claw decreases from the outside to the inside. A telescopic rod is connected between the second stepped claw and the second mounting plate. A second spring is connected between the telescopic rod and the second stepped claw.

[0016] As a further preferred embodiment, the second drive mechanism includes a second sliding mounting plate slidably connected to the right mounting base via a second guide shaft. An annular cylinder is rotatably mounted in the middle of the second sliding mounting plate. The annular cylinder is connected to the fixed end of each telescopic rod via a connecting pipe. A piston plate is slidably connected inside the annular cylinder. A sliding rod penetrating the right wall of the annular cylinder is provided on the right side of the piston plate. A transition ring is slidably connected between the right ends of the sliding rod. Cylinders are symmetrically arranged on the side of the second sliding mounting plate. The telescopic ends of the cylinders are fixedly connected to the transition rings.

[0017] The present invention has the following advantages: By adjusting the platform, the installation position of the fixture can be adjusted so that the fixture can be installed in the optimal position for welding work, while improving the fixture installation error tolerance and fixture versatility; by cooperating with the rotation mechanism and the horizontal moving mechanism, the workpiece can be moved to any position for welding, so that the workpiece can be welded in one go; by the inward-outward fixing mechanism and the outward-inward fixing mechanism, workpieces of different sizes can be fixed, and after the second step-shaped jaw contacts and clamps the workpiece, the second step-shaped jaw stops moving, while the other second step-shaped jaws, if they have not clamped the workpiece, will continue to move inward until the workpiece is clamped. In this way, the second step-shaped jaws can automatically adapt to irregular planes to clamp irregularly shaped parts. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention.

[0020] Figure 3 This is a three-dimensional structural diagram of the adjustment platform of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the component on the left side of the mounting base of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the rotating mechanism and the horizontal moving mechanism of the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the inward-outward fixing mechanism of the present invention.

[0024] Figure 7 For the present invention Figure 6 The main view.

[0025] Figure 8 This is a three-dimensional structural diagram of the component on the right side of the mounting base of the present invention.

[0026] Figure 9 This is a three-dimensional structural diagram of the interior of the mounting base on the right side of the present invention.

[0027] Figure 10 This is a three-dimensional structural diagram of the outward-to-inward fixing mechanism of the present invention.

[0028] Figure 11 For the present invention Figure 10 The main view.

[0029] The markings in the diagram are as follows: 1-Adjusting platform, 11-Clamp mounting plate, 12-T-shaped slide rail, 13-T-bolt, 14-Pressure nut, 2-Mounting base, 3-Rotating mechanism, 31-First motor, 32-Sleeve, 33-Transmission belt assembly, 34-Keyed transmission shaft, 4-Horizontal moving mechanism, 41-Hydraulic cylinder, 42-Connecting plate, 43-Hinge rod, 44-Oval hole, 45-Adapter, 46-Clamping shaft, 5-Inner-outer fixing mechanism, 51-Hollow cylinder, 52-First mounting plate, 53-First slide rail, 54-First stepped chuck, 55-First spring, 56-Sliding rod, 57 - Wedge block, 58- Slotted hole, 59- Connecting rod, 510- Connecting ring, 511- First sliding mounting plate, 512- First guide shaft, 513- Second motor, 514- Lead screw, 515- Guide rod, 516- Push plate, 517- Ball bearing, 6- Outer-inner fixing mechanism, 61- Second mounting plate, 62- Second slide groove, 63- Second stepped claw, 64- Telescopic rod, 65- Second spring, 66- Second sliding mounting plate, 67- Second guide shaft, 68- Annular cylinder, 69- Connecting pipe, 610- Piston plate, 611- Slide rod, 612- Adapter ring, 613- Cylinder. Detailed Implementation

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0031] Example 1: An adaptive welding fixture for automotive parts, such as Figures 1-11 As shown, the fixture includes an adjustment platform 1, a mounting base 2, a rotating mechanism 3, a horizontal moving mechanism 4, an inward-outward fixing mechanism 5, and an outward-inward fixing mechanism 6. Mounting bases 2 are installed on both the left and right sides of the top of the adjustment platform 1. The mounting bases 2 can change their left and right positions on the top of the adjustment platform 1, thereby changing the installation position of the fixture, improving installation tolerance and fixture versatility. A rotating mechanism 3 is installed in the middle of each mounting base 2. The rotating end of the left rotating mechanism 3 is connected to the inward-outward fixing mechanism 5, which fixes the workpiece by pressing outwards. The rotating end of the right rotating mechanism 3 is connected to the outward-inward fixing mechanism 6, which fixes the workpiece by clamping inwards. Both the inward-outward fixing mechanism 5 and the outward-inward fixing mechanism 6 can fix workpieces of different sizes. A horizontal moving mechanism 4 is provided on each mounting base 2. The horizontal moving mechanism 4 can drive the inward-outward fixing mechanism 5 and the outward-inward fixing mechanism 6 to change their left and right positions, allowing the workpiece to change position left and right during welding.

[0032] An adaptive welding fixture for automotive parts is used as follows: First, the workpiece is fixed to either the inner-outer fixing mechanism 5 or the outer-inner fixing mechanism 6 based on its appearance. If the workpiece is tubular, it is fixed to the inner-outer fixing mechanism 5; if the workpiece is irregularly shaped, it is fixed to the outer-inner fixing mechanism 6. Then, welding can be performed on the workpiece. During the welding process, the workpiece is rotated by the rotating mechanism 3 to change the welding position on the outer surface of the workpiece. At the same time, the workpiece can be moved left and right by the horizontal moving mechanism 4 for welding. In this way, the horizontal moving mechanism 4 and the rotating mechanism 3 work together to move the workpiece to any position for welding, so that the workpiece can be welded in one go.

[0033] like Figure 3 As shown, the adjustment platform 1 includes a clamp mounting plate 11, T-bolts 13, and a clamping nut 14. The top of the clamp mounting plate 11 has three T-shaped grooves 12 extending left and right. T-bolts 13 are slidably connected to the left and right parts of the T-shaped grooves 12. The T-bolts 13 pass upward through the mounting seat 2 above them and are connected to the clamping nut 14 by threads. When it is necessary to adjust the position of the mounting seat 2 and its components, first loosen the clamping nut 14, then move the mounting seat 2 left and right to adjust the position. After the position of the mounting seat 2 and its components is adjusted, tighten the clamping nut 14 again to fix the mounting seat 2 and its components.

[0034] like Figure 5 As shown, the rotating mechanism 3 includes a first motor 31, a sleeve 32, a transmission belt assembly 33, and a keyed transmission shaft 34. The first motor 31 is fixedly mounted on the lower outer side of the mounting base 2 by bolts. The sleeve 32 is rotatably mounted on the middle of the mounting base 2, extending left and right. The transmission belt assembly 33 is connected between the sleeve 32 and the output shaft of the first motor 31. The transmission belt assembly 33 consists of two pulleys and a transmission belt. The pulleys are mounted on the output shaft of the first motor 31 and the sleeve 32, and the transmission belt is sleeved on the pulleys. The keyed transmission shaft 34 is slidably mounted left and right inside the sleeve 32. When it is necessary to drive the workpiece to rotate, the first motor 31 is controlled to rotate, driving the sleeve 32 and the keyed transmission shaft 34 to rotate, causing the inner-outer fixing mechanism 5 and the outer-inner fixing mechanism 6 to rotate, thereby driving the workpiece to rotate and change its position for welding.

[0035] like Figure 5As shown, the horizontal moving mechanism 4 includes a hydraulic cylinder 41, a connecting plate 42, a hinge rod 43, an adapter 45, and a retaining shaft 46. The hydraulic cylinder 41 extends horizontally from the top of the mounting base 2, with its telescopic end facing outwards. A connecting plate 42 is fixedly mounted on the outer side of the mounting base 2 below the hydraulic cylinder 41. A hinge rod 43 is rotatably mounted on the end of the connecting plate 42. The hinge rod 43 has vertically extending oblong holes 44 at its upper and lower parts. A rotating shaft 46 is rotatably mounted on the telescopic end of the hydraulic cylinder 41 and the left end of the keyed drive shaft 34. The connector 45 ensures that the hinge rod 43 does not affect the rotation of the keyed drive shaft 34. Each connector 45 is equipped with a retaining shaft 46, which is slidably connected to the waist-shaped holes 44 on the upper and lower sides. When it is necessary to move the workpiece left and right for welding, the hydraulic cylinder 41 is controlled to extend and retract, thereby causing the hinge rod 43 to swing inward and outward. When the hinge rod 43 swings inward, it drives the keyed drive shaft 34 to move inward, causing the workpiece to move inward. When the hinge rod 43 swings outward, it drives the keyed drive shaft 34 to move outward, causing the workpiece to move outward.

[0036] like Figure 6 and Figure 7As shown, the inner-outer fixing mechanism 5 includes a fixing structure for fixing the workpiece and a first driving mechanism for driving the fixing structure to work. The fixing structure includes a hollow cylinder 51, a first mounting plate 52, a first stepped claw 54, a first spring 55, a sliding rod 56, a wedge block 57, a connecting rod 59, and a connecting ring 510. The hollow cylinder 51 is fixed to the right end of the keyed drive shaft 34 on the left side. The first mounting plate 52 is concentrically fixed to the right side of the hollow cylinder 51. A first groove 53 is arranged radially on the right side surface of the first mounting plate 52. The first stepped claw 54 is slidably connected in each of the first grooves 53. The thickness of the first stepped claw 54 increases from the inner to the outer side. The outer stepped surface decreases, and each stepped surface can fix workpieces of different diameters. Each stepped surface is provided with anti-slip grooves to improve the friction of fixing the workpieces. The inner end face of the first stepped claw 54 is an upward inclined surface. The first stepped claw 54 and the first mounting plate 52 are connected by a first spring 55. The first spring 55 maintains the position of the first stepped claw 54 and resets it. A sliding rod 56 is slidably connected to the hollow cylinder 51. The right end of the sliding rod 56 is provided with a ring of wedge blocks 57, the same number as the first stepped claw 54. The inclined surface of the wedge block 57 fits against the inclined surface of the first stepped claw 54. The hollow cylinder 51 is slidably connected to the hollow cylinder 51, which has a ring of slotted holes 58 along its axial direction. A connecting rod 59 is radially arranged on the outer surface of the sliding rod 56. The connecting rod 59 passes through the slotted holes 58 and is connected to a connecting ring 510. The first drive mechanism includes a first sliding mounting plate 511, a first guide shaft 512, a second motor 513, a lead screw 514, a guide rod 515, a push plate 516, and ball bearings 517. The first sliding mounting plate 511 is slidably connected to the right side of the left mounting seat 2 via the first guide shaft 512. The second motor 513 is bolted to the lower left side of the first sliding mounting plate 511. The output shaft of the second motor 513... A lead screw 514 is connected, and the right end of the lead screw 514 is rotatably and slidably connected to the first mounting plate 52. A guide rod 515 extending to the left and right is fixedly connected to the upper right side of the first sliding mounting plate 511. The right end of the guide rod 515 is rotatably and slidably connected to the first mounting plate 52. A push plate 516 is slidably connected to the guide rod 515. The push plate 516 is rotatably connected to the right side of the connecting ring 510. The lower part of the push plate 516 is connected to the lead screw 514 by a thread. A ring of ball bearings 517 is rotatably provided on the contact surface between the push plate 516 and the connecting ring 510 to reduce the friction between the connecting ring 510 and the push plate 516 during the rotation process and to protect the connecting ring 510.

[0037] Inward-outward fixing mechanism 5: When fixing the tubular workpiece, according to the inner diameter of the workpiece, it is fitted onto the step of the corresponding first stepped jaw 54. Then, the second motor 513 is controlled to rotate, driving the lead screw 514 to rotate, causing the push plate 516 to move to the left, driving the connecting ring 510 to move to the left, and driving the sliding rod 56 to move to the left through the connecting rod 59, causing the wedge block 57 to move to the left. Under the pushing action of the wedge block 57, the first stepped jaw 54 moves outward to clamp the workpiece, and the first spring 55 is stretched. When it is necessary to release the workpiece, the second motor 513 is controlled to reverse, driving the lead screw 514 to reverse, thereby driving the push plate 516 and the connecting ring 510 to move to the right, causing the sliding rod 56 and the wedge block 57 to move to the right. The first spring 55 returns to its original position, driving the first stepped jaw 54 to move inward to reset, thus releasing the workpiece.

[0038] Example 2: As Figure 10 and Figure 11 As shown, the outward-to-inward fixing mechanism 6 includes a clamping mechanism for clamping the workpiece and a second driving mechanism for driving the clamping mechanism. The clamping mechanism includes a second mounting plate 61, a second stepped jaw 63, a telescopic rod 64, and a second spring 65. The second mounting plate 61 is fixedly mounted on the left end of the keyed drive shaft 34 on the right side. A second sliding groove 62 is provided radially on the left side of the second mounting plate 61. The second stepped jaw 63 is slidably connected in each of the second sliding grooves 62. The thickness of the second stepped jaw 63 decreases from the outside to the inside to meet the needs of clamping workpieces of different sizes. A telescopic rod 64 is connected between the second stepped jaw 63 and the second mounting plate 61, and a second spring 65 is connected between the telescopic rod 64 and the second stepped jaw 63. The second driving mechanism includes a second sliding mounting plate 66, a second guide shaft 67, an annular cylinder 68, a connecting pipe 69, a piston plate 610, and a sliding rod 65. 11. Adapter ring 612 and cylinder 613. The second sliding mounting plate 66 is slidably connected to the left side of the right mounting seat 2 via the second guide shaft 67. An annular cylinder 68 is rotatably mounted in the middle of the second sliding mounting plate 66. The annular cylinder 68 is filled with hydraulic oil. The keyed drive shaft 34 on the right side passes through the middle of the annular cylinder 68. The annular cylinder 68 is connected to the fixed end of each telescopic rod 64 via a connecting pipe 69. The connecting pipe 69 passes through the second mounting plate 61. A piston plate 610 is slidably connected inside the annular cylinder 68. A sliding rod 611 is provided on the right side of the piston plate 610, passing through the right wall of the annular cylinder 68. The right ends of the sliding rods 611 are slidably connected to the adapter ring 612. During the rotation of the second mounting plate 61, the adapter ring 612 will not rotate. A cylinder 613 is symmetrically arranged on the right side of the second sliding mounting plate 66. The telescopic end of the cylinder 613 is fixedly connected to the adapter ring 612.

[0039] Outward-to-inward fixing mechanism 6: When fixing the workpiece, the workpiece is first placed between the second stepped jaws 63. Then, the control cylinder 613 retracts, thereby driving the adapter ring 612 and slide rod 611 to move to the right, causing the piston plate 610 to move to the right. At this time, the hydraulic oil in the telescopic rod 64 enters the annular cylinder 68 through the connecting pipe 69. The telescopic rod 64 then shortens, driving the second stepped jaws 63 to move inward. The second spring 65 is compressed. After the second stepped jaws 63 contact the workpiece, the... The second-step chuck 63 stops moving. If the other second-step chucks 63 do not clamp the workpiece, they will continue to move inward until the workpiece is clamped. In this way, the second-step chucks 63 can automatically adapt to irregular planes to clamp irregularly shaped parts. When it is necessary to release the workpiece, the control cylinder 613 extends and resets, driving the piston plate 610 to move to the left and reset. At the same time, the second spring 65 resets, and the hydraulic oil in the annular cylinder 68 returns to the telescopic rod 64 through the connecting pipe 69, releasing the workpiece.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adaptive welding fixture for automotive parts, characterized in that: The system includes an adjustment platform (1), a mounting base (2), a rotating mechanism (3), a horizontal moving mechanism (4), an inward-outward fixing mechanism (5), and an outward-inward fixing mechanism (6). Mounting bases (2) are installed on the top left and right sides of the adjustment platform (1). The mounting bases (2) can change their left and right positions on the top of the adjustment platform (1). A rotating mechanism (3) is installed in the middle of each mounting base (2). The rotating end of the rotating mechanism (3) on the left is connected to the inward-outward fixing mechanism (5). The inward-outward fixing mechanism (5) fixes the workpiece from the inside out. The rotating end of the rotating mechanism (3) on the right is connected to the outward-inward fixing mechanism (6). The outward-inward fixing mechanism (6) fixes the workpiece from the outside in. Both the inward-outward fixing mechanism (5) and the outward-inward fixing mechanism (6) can fix workpieces of different sizes. A horizontal moving mechanism (4) is provided on each mounting base (2). The horizontal moving mechanism (4) can drive the inward-outward fixing mechanism (5) and the outward-inward fixing mechanism (6) to change their left and right positions.

2. The adaptive welding fixture for automotive parts according to claim 1, characterized in that: The adjustment platform (1) includes a clamp mounting plate (11) with multiple T-shaped grooves (12) on the top. T-shaped bolts (13) are slidably connected in each of the T-shaped grooves (12). The T-shaped bolts (13) pass upward through the mounting seat (2) above them and are connected to a clamping nut (14) by threads.

3. The adaptive welding fixture for automotive parts according to claim 2, characterized in that: The rotating mechanism (3) includes a first motor (31) mounted on the side of the mounting base (2) and a sleeve (32) rotatably mounted in the middle of the mounting base (2). A transmission belt group (33) is connected between the sleeve (32) and the output shaft of the first motor (31). A keyed transmission shaft (34) is slidably mounted inside the sleeve (32).

4. The adaptive welding fixture for automotive parts according to claim 3, characterized in that: The horizontal moving mechanism (4) includes a hydraulic cylinder (41) installed on the top of the mounting base (2). A connecting plate (42) is provided on the mounting base (2) below the hydraulic cylinder (41). A hinge rod (43) is rotatably installed at the end of the connecting plate (42). A waist-shaped hole (44) is provided on the upper and lower parts of the hinge rod (43). A converter (45) is rotatably installed on the telescopic end of the hydraulic cylinder (41) and the left end of the keyed drive shaft (34). A retaining shaft (46) is provided on the converter (45). The retaining shaft (46) is slidably connected to the waist-shaped holes (44) on the upper and lower sides.

5. The adaptive welding fixture for automotive parts according to claim 4, characterized in that: The inner-outer fixing mechanism (5) includes a fixing structure for fixing the workpiece and a first driving mechanism for driving the fixing structure to work.

6. The adaptive welding fixture for automotive parts according to claim 5, characterized in that: The fixed structure includes a hollow cylinder (51) installed at the right end of the left keyed drive shaft (34). A first mounting plate (52) is fixedly connected to the right side of the hollow cylinder (51). A first sliding groove (53) is provided radially on the right side of the first mounting plate (52). A first stepped claw (54) is slidably connected in each of the first sliding grooves (53). The thickness of the first stepped claw (54) decreases from the inside to the outside. The inner end face of the first stepped claw (54) is an upwardly inclined surface. The first stepped claw (54) and the first mounting plate (52) are connected. A first spring (55) is connected to the hollow cylinder (51), and a sliding rod (56) is slidably connected inside the hollow cylinder (51). A wedge block (57) with the same number as the first stepped claw (54) is provided at the right end of the sliding rod (56). The inclined surface of the wedge block (57) is in contact with the inclined surface of the first stepped claw (54). A hole (58) is provided along the axial direction of the hollow cylinder (51). A connecting rod (59) is provided along the radial direction of the outer surface of the sliding rod (56). The connecting rod (59) passes through the hole (58) and is connected to a connecting ring (510).

7. The adaptive welding fixture for automotive parts according to claim 6, characterized in that: The first driving mechanism includes a first sliding mounting plate (511) that is slidably connected to the left mounting base (2) via a first guide shaft (512). A second motor (513) is mounted on the first sliding mounting plate (511). A lead screw (514) is connected to the output shaft of the second motor (513). The end of the lead screw (514) is rotatably and slidably connected to the first mounting plate (52). A guide rod (515) is fixedly connected to the upper part of the first sliding mounting plate (511). The end of the guide rod (515) is rotatably and slidably connected to the first mounting plate (52). A push plate (516) is slidably connected to the guide rod (515). The push plate (516) is rotatably connected to the right side of the connecting ring (510). The lower part of the push plate (516) is threadedly connected to the lead screw (514). A ring of ball bearings (517) is rotatably disposed on the contact surface between the push plate (516) and the connecting ring (510).

8. The adaptive welding fixture for automotive parts according to claim 7, characterized in that: The outward-to-inward fixing mechanism (6) includes a clamping mechanism for clamping the workpiece and a second driving mechanism for driving the clamping mechanism to work.

9. The adaptive welding fixture for automotive parts according to claim 8, characterized in that: The clamping mechanism includes a second mounting plate (61) installed on the left end of the keyed drive shaft (34) on the right side. A second sliding groove (62) is provided on the left side of the second mounting plate (61) along its radial direction. A second stepped claw (63) is slidably connected in the second sliding groove (62). The thickness of the second stepped claw (63) decreases from the outside to the inside. A telescopic rod (64) is connected between the second stepped claw (63) and the second mounting plate (61). A second spring (65) is connected between the telescopic rod (64) and the second stepped claw (63).

10. An adaptive welding fixture for automotive parts according to claim 9, characterized in that: The second drive mechanism includes a second sliding mounting plate (66) slidably connected to the right mounting base (2) via a second guide shaft (67). An annular cylinder (68) is rotatably mounted in the middle of the second sliding mounting plate (66). The annular cylinder (68) is connected to the fixed end of each telescopic rod (64) via a connecting pipe (69). A piston plate (610) is slidably connected inside the annular cylinder (68). A sliding rod (611) is provided on the right side of the piston plate (610) and passes through the right wall of the annular cylinder (68). A transition ring (612) is slidably connected between the right ends of the sliding rod (611). Cylinders (613) are symmetrically arranged on the side of the second sliding mounting plate (66). The telescopic end of the cylinder (613) is fixedly connected to the transition ring (612).

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