Centering and positioning mechanism of automobile stamping part welding fixture

Abstract

The invention discloses a centering and positioning mechanism of an automobile stamping part welding fixture, and relates to the technical field of automobile production. The centering and positioning mechanism of the automobile stamping part welding clamp comprises a supporting frame, a double-station alternate conveying assembly is arranged on the supporting frame, and two symmetrically-distributed turnover devices are arranged on the double-station alternate conveying assembly. A positioning clamping assembly, a clamping adjusting assembly and a driving assembly are arranged in the turnover device. By arranging the driving assembly and the positioning and clamping assembly, the driving assembly drives the two first clamping plates to get close to each other to clamp and position the longitudinal beam while driving the two sliding frames to get close to each other, and in the process, the effect of synchronous clamping and fixing in the longitudinal beam splicing process is achieved; through cooperation of the driving assembly and the positioning and clamping assembly, it can be ensured that the longitudinal beam is kept at the accurate position in the splicing process, and deviation is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile production, and particularly to a centering and positioning mechanism for a welding fixture of automobile stamping parts. Background Art

[0002] An automobile is a widely used means of transportation, usually composed of multiple parts such as a body, a power system, a chassis, and an electronic system. During the production process of the subframe at the bottom of the automobile, the cross beam and the longitudinal beam need to be welded and fixed by the method of carbon dioxide shielded welding. In the traditional subframe welding, the cross beam and the longitudinal beam need to be spliced according to the design requirements first, and then the spliced cross beam and longitudinal beam are clamped and fixed by a special fixture. The welding ends of the longitudinal beam are mostly irregular in shape, and the traditional fixture may not fully adapt to the shape of the longitudinal beam, resulting in misalignment during splicing, which in turn affects the welding quality. Secondly, the cross beam will shift during placement, making the position of the cross beam not centered, so that there is a gap between the cross beam and the longitudinal beam during splicing, affecting the welding quality. In view of the above problems, the inventor proposes a centering and positioning mechanism for a welding fixture of automobile stamping parts to solve the above problems. Summary of the Invention

[0003] In order to solve the problems of misalignment and uneven fitting between the cross beam and the longitudinal beam during splicing; the purpose of the present invention is to provide a centering and positioning mechanism for a welding fixture of automobile stamping parts.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: A centering and positioning mechanism for a welding fixture of automobile stamping parts, including a centering and positioning mechanism for a welding fixture of automobile stamping parts, including a support frame. Two symmetrically distributed side frames are fixedly arranged on the outer wall of the support frame. A robotic arm is arranged in the middle of the tops of the two side frames. A carbon dioxide shielded welding device is arranged in the robotic arm. A double-station alternating conveying assembly is arranged on the support frame. Two symmetrically distributed flipping devices are arranged on the double-station alternating conveying assembly. A positioning and clamping assembly, a clamping adjustment assembly, and a driving assembly are respectively arranged in the flipping devices.

[0005] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0006] Preferably, the flipping device includes a fixed frame, and the two fixed frames are respectively fixedly mounted on the connecting frame and the expansion plate. The fixed frame is rotatably provided with two symmetrically distributed fixed shafts, a rotating frame is fixedly provided between the two fixed shafts, a motor is fixedly provided on one side of the outer wall of the fixed frame, and the driving end of the motor is connected to the adjacent fixed shaft through a synchronous wheel transmission group.

[0007] Preferably, the positioning clamping assembly includes two symmetrically distributed sliding frames, both of which are slidably mounted on the rotating frame, a No. 1 guide rail and a No. 2 guide rail are fixedly arranged on one side of the sliding frame, a No. 3 guide rail is fixedly arranged on the side of the sliding frame away from the No. 1 guide rail, a No. 1 sliding clamping frame is slidably arranged on the No. 1 guide rail and the No. 2 guide rail, a No. 2 sliding clamping frame is slidably arranged on the No. 3 guide rail, a No. 1 clamping plate is fixedly arranged on the top of the No. 1 sliding clamping frame and the No. 2 sliding clamping frame, and a fixed disk is fixedly arranged on the middle of the inner side of the sliding frame. A rotating plate is rotatably provided at the bottom end of the fixed plate, and synchronization rods are rotatably provided at both ends of the rotating plate, and the other ends of the two synchronization rods are rotatably connected to the corresponding No. 1 sliding clamping frame and No. 2 sliding clamping frame respectively, a guide rail is fixedly provided on the inner wall of the rotating frame close to the No. 2 sliding clamping frame, a guide wheel used in conjunction with the guide rail is rotatably provided on the outer side of the No. 2 sliding clamping frame, and the guide wheel is slidably connected to the guide rail, a No. 1 return spring is fixedly provided on the outer side of the No. 2 sliding clamping frame, and the other end of the No. 1 return spring is fixedly connected to the inner wall of the sliding frame.

[0008] Preferably, the clamping and adjusting assembly includes a fixed bracket fixedly installed on the rotating frame. A fixed rod is fixedly provided in the middle of the fixed bracket. A sliding frame is slidably provided on the outer wall of the fixed rod. Two symmetrically distributed second clamping plates are slidably provided on the sliding frame. Two symmetrically distributed folding rods are respectively rotatably provided at the bottoms of the two second clamping plates. A lifting frame is slidably provided on the sliding frame, and the folding rod is rotatably connected to the lifting frame. Two symmetrically distributed second return springs are sleeved on the outer wall of the fixed rod, and the two ends of the second return spring are respectively fixedly connected to the fixed bracket and the sliding frame. Two symmetrically distributed first slide rails are fixedly provided on the fixed bracket, and the sliding frame is slidably connected to the first slide rails.

[0009] Preferably, the driving assembly includes a second slide rail fixedly installed in the middle of the rotating frame. A driving plate is slidably provided on the second slide rail. A positioning frame is fixedly provided in the middle of the inner wall of the rotating frame. A driving electric cylinder is fixedly provided in the positioning frame. A fixing plate is fixedly provided at the top of the driving plate, and the driving end of the driving electric cylinder is fixedly connected to the fixing plate. Two symmetrically distributed linkage rods are rotatably provided on the driving plate, and the other ends of the linkage rods are rotatably connected to the sliding frame. A second guiding plate is fixedly provided in the middle of the top of the driving plate, close to one side of the fixed bracket. A second guiding groove for cooperating with the lifting frame is provided on the second guiding plate, and the lifting frame is slidably connected to the second guiding groove.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting the driving assembly and the positioning and clamping assembly, when the driving assembly drives the two sliding frames to approach each other, the two first clamping plates are driven to approach each other through the guide rails, guide wheels, rotating plates and synchronizing rods to clamp and position the longitudinal beam. Through the above process, the effect of synchronously clamping and fixing the longitudinal beam during the splicing process is achieved. Through the cooperation of the driving assembly and the positioning and clamping assembly, it can ensure that the longitudinal beam maintains an accurate position during the splicing process, reduce deviations, thereby improving the splicing quality and the overall production efficiency; 2. By setting the driving assembly and the clamping and adjusting assembly, the driving assembly drives the two second clamping plates in the clamping and adjusting assembly to approach each other to clamp and fix the cross beam. During the clamping process, the second clamping plates can move horizontally under the guidance of the fixed rod and the first slide rails along with the sliding frame, so as to avoid the splicing connection not fitting due to the non-centered placement of the cross beam, and improve the splicing fit and welding quality; 3. By setting the double-station alternating conveying assembly, the double-station alternating conveying assembly drives the two fixed frames to be conveyed alternately, realizing the blanking of the welded cross beam and longitudinal beam and the feeding of the next batch of welding raw materials while performing the welding operation, improving the overall production efficiency and coherence. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0012] Figure 1 Schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the structure of the flipping device in the present invention; Figure 3 Schematic diagram of the structure of the dual-station alternating conveying assembly in the present invention; Figure 4 Partial structure schematic diagram of the dual-station alternating conveying assembly in the present invention; Figure 5 Schematic diagram of the transmission structure of the dual-station alternating conveying assembly in the present invention; Figure 6 Overall structure schematic diagram of the positioning and clamping assembly, clamping adjustment assembly and driving assembly in the present invention; Figure 7 Schematic diagram of the bottom view structure of the driving assembly in the present invention; Figure 8 Partial structure schematic diagram of the driving assembly in the present invention; Figure 9 Schematic diagram of the structure of the clamping adjustment assembly in the present invention; Figure 10 Schematic diagram of the sectional structure of the sliding frame in the present invention; Figure 11 Overall structure schematic diagram of the positioning and clamping assembly in the present invention; Figure 12 For Figure 6 Enlarged schematic diagram of the structure at position A in

[0013] In the figure: 1. Support frame; 2. Side frame; 3. Robotic arm; 4. CO₂ shielded welding device; 5. Dual-station alternating conveying assembly; 501. Support plate; 502. First guide plate; 503. Sliding plate; 504. Connecting frame; 505. Guide rod; 506. Guide frame; 507. First guide groove; 508. Linear electric cylinder; 509. Driving wheel; 510. Synchronous belt; 511. Connecting plate; 512. Extension plate; 6. Flipping device; 601. Fixed frame; 602. Rotating frame; 603. Fixed shaft; 604. Motor; 7. Positioning and clamping assembly; 701. Sliding frame; 702. First guide rail; 703. Second guide rail; 704. Third guide rail; 705. First sliding clamping frame; 706. Second sliding clamping frame; 707. First clamping plate; 708. Fixed disk; 709. Rotating plate; 710. Synchronous rod; 711. Guide wheel; 712. Guide track; 713. First return spring; 8. Clamping adjustment assembly; 801. Fixed bracket; 802. Sliding frame; 803. Second clamping plate; 804. Folding rod; 805. Lifting frame; 806. Fixed rod; 807. Second return spring; 808. First sliding rail; 9. Driving assembly; 901. Second sliding rail; 902. Driving plate; 903. Linking rod; 904. Fixed plate; 905. Second guide plate; 906. Second guide groove; 907. Positioning frame; 908. Driving electric cylinder. Detailed implementation mode

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Embodiment: As Figures 1-12 shown, the present invention provides a technical solution: a centering and positioning mechanism for a welding fixture of an automotive stamping part, including a centering and positioning mechanism for a welding fixture of an automotive stamping part, including a support frame 1. Two symmetrically distributed side frames 2 are fixedly arranged on the outer wall of the support frame 1. In the middle of the tops of the two side frames 2, there is a robotic arm 3. A CO₂ shielded welding device 4 is arranged in the robotic arm 3. A dual-station alternating conveying assembly 5 is arranged on the support frame 1. Two symmetrically distributed flipping devices 6 are arranged on the dual-station alternating conveying assembly 5. A positioning and clamping assembly 7, a clamping adjustment assembly 8, and a driving assembly 9 are respectively arranged in the flipping devices 6.

[0016] The double-station alternating conveying assembly 5 includes two symmetrically distributed support plates 501, both of which are fixedly mounted on the support frame 1, a No. 1 guide plate 502 is provided between the two support plates 501, and the No. 1 guide plate 502 is fixedly mounted on the support frame 1, a sliding plate 503 is slidably provided on the support plate 501, guide rods 505 are inserted through the four corners of the top of the sliding plate 503, a connecting frame 504 is fixedly provided on the top of two adjacent guide rods 505, a guide frame 506 is fixedly provided between the two connecting frames 504, a No. 1 guide groove 507 is provided on the No. 1 guide plate 502, and the guide frame 506 is slidably connected to the No. 1 guide groove 507, and two symmetrically distributed expansion plates 512 are slidably provided on the top of the support frame 1.

[0017] By adopting the above technical solution, the sliding plate 503 drives the connecting frame 504 to move up and down through the No. 1 guide groove 507 and the guide frame 506 during the movement.

[0018] The flipping device 6 includes a fixed frame 601, and the two fixed frames 601 are respectively fixedly installed on the connecting frame 504 and the expansion plate 512. Two symmetrically distributed fixed shafts 603 are rotatably provided in the fixed frame 601, and a rotating frame 602 is fixedly provided between the two fixed shafts 603. A motor 604 is fixedly provided on one side of the outer wall of the fixed frame 601, and the driving end of the motor 604 is connected to the adjacent fixed shaft 603 through a synchronous wheel transmission group.

[0019] By adopting the above technical solution, the rotating frame 602 is rotated in the fixed frame 601 .

[0020] The positioning clamping assembly 7 includes two symmetrically distributed sliding frames 701, and the two sliding frames 701 are both slidably installed in the rotating frame 602. A No. 1 guide rail 702 and a No. 2 guide rail 703 are fixedly arranged on one side of the sliding frame 701, and a No. 3 guide rail 704 is fixedly arranged on the side of the sliding frame 701 away from the No. 1 guide rail 702. A No. 1 sliding clamping frame 705 is slidably arranged on the No. 1 guide rail 702 and the No. 2 guide rail 703, and a No. 2 sliding clamping frame 706 is slidably arranged on the No. 3 guide rail 704. A No. 1 clamping plate 707 is fixedly arranged on the top of the No. 1 sliding clamping frame 705 and the No. 2 sliding clamping frame 706, and a fixed disk 708 is fixedly arranged on the middle part of the inner side of the sliding frame 701, and a rotating plate 709 is rotatably arranged on the bottom end of the fixed disk 708, and synchronization rods 710 are rotatably arranged at both ends of the rotating plate 709, and the other ends of the two synchronization rods 710 are rotatably connected to the corresponding No. 1 sliding clamping frame 705 and No. 2 sliding clamping frame 706.

[0021] By adopting the above technical solution, the first sliding clamping frame 705 and the second sliding clamping frame 706 are moved in opposite directions.

[0022] The clamping adjustment assembly 8 includes a fixed bracket 801, which is fixedly installed on the rotating frame 602. A fixed rod 806 is fixedly provided in the middle of the fixed bracket 801. A sliding frame 802 is slidably provided on the outer wall of the fixed rod 806. Two symmetrically distributed second clamping plates 803 are slidably provided on the sliding frame 802. Two symmetrically distributed folding rods 804 are respectively rotatably provided at the bottoms of the two second clamping plates 803. A lifting frame 805 is slidably provided on the sliding frame 802, and the folding rod 804 is rotatably connected to the lifting frame 805. Two symmetrically distributed second return springs 807 are sleeved on the outer wall of the fixed rod 806, and the two ends of the second return spring 807 are respectively fixedly connected to the fixed bracket 801 and the sliding frame 802. Two symmetrically distributed first slide rails 808 are fixedly provided on the fixed bracket 801, and the sliding frame 802 is slidably connected to the first slide rails 808.

[0023] By adopting the above technical solution, the sliding frame 802 moves horizontally under the guidance of the fixed rod 806 and the first slide rails 808.

[0024] The driving assembly 9 includes a second slide rail 901, which is fixedly installed in the middle of the rotating frame 602. A driving plate 902 is slidably provided on the second slide rail 901. A positioning frame 907 is fixedly provided in the middle of the inner wall of the rotating frame 602. A driving electric cylinder 908 is fixedly provided in the positioning frame 907. A fixing plate 904 is fixedly provided at the top of the driving plate 902, and the driving end of the driving electric cylinder 908 is fixedly connected to the fixing plate 904. Two symmetrically distributed linkage rods 903 are rotatably provided on the driving plate 902, and the other ends of the linkage rods 903 are rotatably connected to the sliding frame 701.

[0025] By adopting the above technical solution, the movement of the driving plate 902 drives the two sliding frames 701 to move synchronously.

[0026] Six symmetrically distributed transmission wheels 509 are rotatably provided on one side of the inner wall of the support frame 1. A synchronous belt 510 is sleeved on the outer walls of the six transmission wheels 509. Two symmetrically distributed connecting plates 511 are fixedly provided on the synchronous belt 510. The two connecting plates 511 are respectively fixedly connected to the corresponding sliding plates 503 and the fixed frame 601.

[0027] By adopting the above technical solution, the two connecting plates 511 move in opposite directions under the action of the synchronous belt 510.

[0028] A linear electric cylinder 508 is fixedly provided on one side of the support frame 1 away from the transmission wheel 509, and the driving end of the linear electric cylinder 508 is fixedly connected to the sliding plate 503.

[0029] By adopting the above technical solution, the linear electric cylinder 508 drives the sliding plate 503 to move.

[0030] On the inner wall of the rotating frame 602, a guide rail 712 is fixedly arranged near one side of the second sliding clamping frame 706. On the outer side of the second sliding clamping frame 706, a guide wheel 711 which is used in cooperation with the guide rail 712 is rotatably arranged, and the guide wheel 711 is slidably connected with the guide rail 712. On the outer side of the second sliding clamping frame 706, a first return spring 713 is fixedly arranged, and the other end of the first return spring 713 is fixedly connected with the inner wall of the sliding frame 701.

[0031] By adopting the above technical solution, the second sliding clamping frame 706 is moved under the guidance of the guide wheel 711, the guide rail 712 and the first return spring 713.

[0032] In the middle near one side of the fixed bracket 801 at the top end of the driving plate 902, a second guide plate 905 is fixedly arranged. On the second guide plate 905, a second guide groove 906 which is used in cooperation with the lifting frame 805 is formed, and the lifting frame 805 is slidably connected with the second guide groove 906.

[0033] By adopting the above technical solution, when the driving plate 902 moves, the lifting frame 805 is driven to move up and down through the second guide plate 905 and the second guide groove 906.

[0034] Working principle: First, the crossbeam needs to be placed on the sliding frame 802 in the right rotating frame 602 through an external conveying device. The two longitudinal beams are placed on the corresponding sliding frames 701 in sequence. Then, the driving electric cylinder 908 is controlled to start. The driving end of the driving electric cylinder 908 extends to push the driving plate 902 to move. During the movement of the driving plate 902, the two sliding frames 701 are driven to approach each other through the linkage rod 903. While the sliding frame 701 is moving, the second sliding clamping frame 706 is driven to move through the guide wheel 711 and the guide rail 712. While the second sliding clamping frame 706 is moving, the first sliding clamping frame 705 is driven to move synchronously and in the opposite direction through the rotating plate 709 and the synchronizing rod 710. The two first clamping plates 707 are driven by the first sliding clamping frame 705 and the second sliding clamping frame 706 to cooperate with each other to position and clamp the longitudinal beam. While the driving plate 902 is moving, the lifting frame 805 is driven to move downward through the second guide plate 905 and the second guide groove 906. While the lifting frame 805 is moving, the two second clamping plates 803 are driven to approach each other through the folding rod 804 to clamp the crossbeam. The two sliding frames 701 approaching each other drive the two longitudinal beams to fit with the corresponding positions at both ends of the crossbeam. If the placement position of the crossbeam is offset, it will first fit with one side longitudinal beam. After the fitting is completed, the longitudinal beam will drive the sliding frame 802 to move in the fixed bracket 801 under the guidance of the fixed rod 806 and the first slide rail 808 until it fits with the other longitudinal beam. At this time, the lifting frame 805 slides in the second guide groove 906. At the same time, the driving end of the linear electric cylinder 508 drives the sliding plate 503 to move away from the carbon dioxide shielded welding device 4. During the movement of the sliding plate 503, the right fixed frame 601 is driven to move towards the carbon dioxide shielded welding device 4 through the transmission wheel 509, the synchronous belt 510 and the connecting plate 511. The fixed frame 601 on one side of the sliding plate 503 moves up and down under the action of the connecting frame 504, the guide rod 505, the guide frame 506, the first guide plate 502 and the first guide groove 507 during the movement, so that the two fixed frames 601 are misaligned during the process of alternating positions to ensure stable conveying. After the positions of the two fixed frames 601 are alternated, the spliced crossbeam and longitudinal beam are welded and fixed by the robotic arm 3 and the carbon dioxide shielded welding device 4. At the same time, according to the same steps above, the next batch of crossbeams and longitudinal beams are placed on the corresponding sliding frames 701 and sliding frames 802 through an external conveying device, and the crossbeams and longitudinal beams are positioned and fixed according to the same steps above. After the front side of the crossbeam and longitudinal beam is welded, the driving end of the control motor 604 drives the rotating frame 602 to rotate half a circle through the fixed shaft 603, and then the back side of the crossbeam and longitudinal beam is welded. After the welding is completed, the control motor 604 continues to drive the rotating frame 602 to rotate half a circle to reset, and then the control linear electric cylinder 508 drives the sliding plate 503 to reset, and the fixed frame 601 and the rotating frame 602 are driven to reset according to the same steps above. During the welding of another group of crossbeams and longitudinal beams by the robotic arm 3 and the carbon dioxide shielded welding device 4,After the welding of the cross beam and the longitudinal beam is completed, the whole is clamped and fixed by an external feeding device. Then, the driving electric cylinder 908 in the corresponding rotating frame 602 is controlled to contract. According to the above opposite steps, the first clamping plate 707 and the second clamping plate 803 are driven to reset and stop clamping and fixing the whole welded cross beam and longitudinal beam. The whole welded part is transferred by an external feeding device for the next process. After the sliding frame 701 is reset, the next batch of cross beams and longitudinal beams are continuously placed through an external conveying device, and this process is repeated.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A centering and positioning mechanism for a welding fixture of an automotive stamping part, including a support frame (1), characterized in that: The outer wall of the support frame (1) is fixedly provided with two symmetrically distributed side frames (2), a mechanical arm (3) is provided at the middle of the top end of the two side frames (2), and a carbon dioxide shielded welding device (4) is provided in the mechanical arm (3), and a double-station alternating conveying component (5) is provided on the support frame (1), and two symmetrically distributed turning devices (6) are provided on the double-station alternating conveying component (5), and the turning devices (6) are respectively provided with a positioning clamping component (7), a clamping adjustment component (8) and a driving component (9).

2. The centering and positioning mechanism of an automotive stamping part welding fixture according to claim 1, characterized in that, The double-station alternating conveying assembly (5) comprises two symmetrically distributed support plates (501), the two support plates (501) are fixedly mounted on the support frame (1), a first guide plate (502) is arranged between the two support plates (501), and the first guide plate (502) is fixedly mounted on the support frame (1), a sliding plate (503) is slidably arranged on the support plate (501), guide rods (505) are inserted through the four corners of the top of the sliding plate (503), a connecting frame (504) is fixedly arranged at the top of two adjacent guide rods (505), a guide frame (506) is fixedly arranged between the two connecting frames (504), a first guide groove (507) is provided on the first guide plate (502), and the guide frame (506) is slidably connected to the first guide groove (507), and two symmetrically distributed expansion plates (512) are slidably arranged on the top of the support frame (1).

3. The centering and positioning mechanism of an automotive stamping part welding fixture according to claim 1, characterized in that, The flipping device (6) comprises a fixed frame (601), wherein two fixed frames (601) are respectively fixedly mounted on a connecting frame (504) and an expansion plate (512), wherein two symmetrically distributed fixed shafts (603) are rotatably arranged in the fixed frame (601), a rotating frame (602) is fixedly arranged between the two fixed shafts (603), and a motor (604) is fixedly arranged on one side of an outer wall of the fixed frame (601), and a driving end of the motor (604) is transmission-connected to an adjacent fixed shaft (603) via a synchronous wheel transmission group.

4. The centering and positioning mechanism of an automotive stamping part welding fixture as described in claim 1, characterized in that, The positioning and clamping assembly (7) includes two symmetrically distributed sliding frames (701), both of the two sliding frames (701) are slidably mounted in the rotating frame (602). One side of the sliding frame (701) is fixedly provided with a first guide rail (702) and a second guide rail (703), and the side of the sliding frame (701) away from the first guide rail (702) is fixedly provided with a third guide rail (704). A first sliding clamping frame (705) is slidably arranged on the first guide rail (702) and the second guide rail (703), and a second sliding clamping frame (706) is slidably arranged on the third guide rail (704). The top ends of the first sliding clamping frame (705) and the second sliding clamping frame (706) are both fixedly provided with a first clamping plate (707). The middle part inside the sliding frame (701) is fixedly provided with a fixed disk (708). A rotating plate (709) is rotatably arranged at the bottom end of the fixed disk (708). Synchronous rods (710) are rotatably arranged at both ends of the rotating plate (709), and the other ends of the two synchronous rods (710) are respectively rotatably connected to the corresponding first sliding clamping frame (705) and second sliding clamping frame (706).

5. The centering and positioning mechanism of an automotive stamping part welding fixture according to claim 1, characterized in that, The clamping and adjusting assembly (8) includes a fixed bracket (801), the fixed bracket (801) is fixedly mounted on the rotating frame (602). A fixed rod (806) is fixedly arranged in the middle of the fixed bracket (801). A sliding frame (802) is slidably arranged on the outer wall of the fixed rod (806). Two symmetrically distributed second clamping plates (803) are slidably arranged on the sliding frame (802). Two symmetrically distributed folding rods (804) are respectively rotatably arranged at the bottom ends of the two second clamping plates (803). A lifting frame (805) is slidably arranged on the sliding frame (802), and the folding rod (804) is rotatably connected to the lifting frame (805). Two symmetrically distributed second return springs (807) are sleeved on the outer wall of the fixed rod (806), and the two ends of the second return spring (807) are respectively fixedly connected to the fixed bracket (801) and the sliding frame (802). Two symmetrically distributed first slide rails (808) are fixedly arranged on the fixed bracket (801), and the sliding frame (802) is slidably connected to the first slide rail (808).

6. The centering and positioning mechanism of an automotive stamping part welding fixture as described in claim 1, wherein, The driving assembly (9) includes a second slide rail (901), the second slide rail (901) is fixedly mounted in the middle of the rotating frame (602). A driving plate (902) is slidably arranged on the second slide rail (901). A positioning frame (907) is fixedly arranged in the middle of the inner wall of the rotating frame (602). A driving electric cylinder (908) is fixedly arranged in the positioning frame (907). A fixing plate (904) is fixedly arranged at the top end of the driving plate (902), and the driving end of the driving electric cylinder (908) is fixedly connected to the fixing plate (904). Two symmetrically distributed linkage rods (903) are rotatably arranged on the driving plate (902), and the other ends of the linkage rods (903) are rotatably connected to the sliding frame (701).

7. The centering and positioning mechanism of an automotive stamping part welding fixture according to claim 1, characterized in that, On one side of the inner wall of the support frame (1), six symmetrically distributed driving wheels (509) are rotatably arranged. A synchronous belt (510) is sleeved on the outer walls of the six driving wheels (509). Two symmetrically distributed connecting plates (511) are fixedly arranged on the synchronous belt (510). The two connecting plates (511) are respectively fixedly connected to the corresponding sliding plates (503) and the fixed frame (601).

8. The centering and positioning mechanism of an automotive stamping part welding fixture according to claim 1, characterized in that, A linear electric cylinder (508) is fixedly arranged on one side of the support frame (1) away from the driving wheels (509), and the driving end of the linear electric cylinder (508) is fixedly connected to the sliding plate (503).

9. The centering and positioning mechanism of an automotive stamping part welding fixture according to claim 4, characterized in that, On one side of the inner wall of the rotating frame (602) close to the second sliding clamping frame (706), a guide rail (712) is fixedly arranged. A guide wheel (711) which is used in cooperation with the guide rail (712) is rotatably arranged on the outer side of the second sliding clamping frame (706). The guide wheel (711) is slidably connected to the guide rail (712). A first return spring (713) is fixedly arranged on the outer side of the second sliding clamping frame (706), and the other end of the first return spring (713) is fixedly connected to the inner wall of the sliding frame (701).

10. The centering and positioning mechanism of an automotive stamping part welding fixture according to claim 6, characterized in that, In the middle of one side of the top end of the driving plate (902) close to the fixed bracket (801), a second guide plate (905) is fixedly arranged. A second guide groove (906) which is used in cooperation with the lifting frame (805) is formed in the second guide plate (905), and the lifting frame (805) is slidably connected to the second guide groove (906).

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