Spot welding clamp tool for left rear door C column inner and outer plates

Abstract

The utility model belongs to the field of clamps, and provides a spot welding clamp tool for a left rear door C column inner plate and a left rear door C column outer plate. The supporting blocks and the positioning blocks are arranged on the tool plate, each of the inner plate and the outer plate is provided with a main body part and an extension part, the extension part is connected to one end of the main body part and extends outwards in the width direction of the main body part, and the supporting blocks are used for supporting the main body part and the extension part above the tool plate; the side, away from the extending part, of the body part movably abuts against the positioning block. Compared with the prior art, the utility model has the advantages that through the application of the lever principle, not only is the operating force saved, but also the pressing block can extend to the upper part of the extension part from one side of the main body part for effective pressing, the requirements of parts with different shapes are met, the production efficiency is improved, and the production cost is reduced while the stable attachment of inner and outer plates is ensured. And enough welding operation space can be provided for a spot welding machine on one side of the extension part, and the quality and strength of a welding joint are enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of fixtures, specifically relating to a spot welding fixture for the inner and outer panels of the C-pillar of the left rear door. Background Technology

[0002] In automobile manufacturing, body components such as doors and pillars are typically made of two layers of metal. To ensure the vehicle's safety and structural integrity, these components must be joined together using precise welding techniques.

[0003] Because multiple welding points need to be performed at the periphery of the extension after the outer and inner panels overlap, space needs to be reserved in advance for the spot welding machine during the positioning and installation of the tooling fixture. This makes it impossible for traditional fixtures to guarantee sufficient stable clamping force on the far extension from one side of the main body. Furthermore, the manual positioning and welding operation inevitably introduces human error, making it difficult to ensure that each weld meets the same high-quality standard. This affects overall production efficiency and reduces the pass rate of the welded products. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a spot welding fixture for the inner and outer panels of the left rear door C-pillar that can achieve stable clamping of the product at the far end and at the same time provide sufficient space for the spot welding machine to perform spot welding operations.

[0005] The technical solution adopted by this utility model to solve its technical problem is to propose a spot welding fixture for the inner and outer panels of the C-pillar of the left rear door, which is used to realize the positioning and installation of the inner and outer panels, including: a fixture plate;

[0006] Several support blocks and positioning blocks are disposed on the tooling plate. Both the inner plate and the outer plate have a main body and an extension. The extension is connected to one end of the main body and extends outward along the width direction of the main body. The support blocks are used to support the main body and the extension above the tooling plate. The side of the main body away from the extension moves against the positioning block to restrict the placement position of the inner and outer plates on the tooling plate.

[0007] A clamping mechanism is provided on the tooling plate. The clamping mechanism includes a clamping block and a rotating block. The mounting end of the clamping block is connected to the rotating block. The clamping end of the clamping block is used to movably clamp the outer plate onto the inner plate. The end of the rotating block away from the clamping block is connected to the output end of the clamping mechanism. It is used to drive the clamping block closer to or away from the outer plate. The distance from the output end of the clamping mechanism to the rotation center of the rotating block is less than the distance from the clamping end to the rotation center of the rotating block. This allows the clamping block to extend from one side of the main body to above the extension and clamp and fix it, so that the spot welding machine can weld the two overlapping extensions into one piece.

[0008] In the aforementioned spot welding fixture for the inner and outer panels of the left rear door C-pillar, the clamping mechanism further includes:

[0009] A first mounting base is disposed on the tooling plate, and the rotating block is hinged to the first mounting base;

[0010] A second mounting base is disposed on the tooling plate and spaced apart from the first mounting base. A driving component is movably hinged to the second mounting base. The output end of the driving component is hinged to the rotating block so that when the rotating block rotates, it can drive the clamping block to move closer to or away from the inner and outer plates.

[0011] In the above-mentioned spot welding fixture for the inner and outer panels of the C-pillar of the left rear door, the support block includes a mounting part and a support part. The mounting part has a connecting hole, which can be installed on the fixture plate by fasteners. The support part is arranged in a vertical direction and is connected to the mounting part by an extension block so that the support part can support the inner and outer panels in a horizontal position.

[0012] In the aforementioned spot welding fixture for the inner and outer panels of the C-pillar of the left rear door, the rotating block consists of a rotating part, a connecting part, and an assembly part. A mounting groove is provided in the first mounting seat, and the rotating part is movably disposed in the mounting groove. The connecting part connects to the rotating part and extends to the outside of the first mounting seat for connection to the output end of the driving component. The assembly part is vertically connected to the rotating part, and the clamping block is detachably connected to the assembly part.

[0013] In the above-mentioned spot welding fixture for the inner and outer panels of the C-pillar of the left rear door, a connecting shaft is provided in the first mounting base. The connecting shaft passes through the mounting groove and the rotating part so that the clamping block can rotate around the axis of the connecting shaft.

[0014] In the above-mentioned spot welding fixture for the inner and outer panels of the C-pillar of the left rear door, a connecting block is also provided on the side wall of the first mounting base, and a limiter is provided on the connecting block. The bottom wall of the assembly part is movably pressed against the limiter.

[0015] In the above-mentioned spot welding fixture for the inner and outer panels of the C-pillar of the left rear door, a locking groove is formed on the side of the main body near the extension, an anti-detachment block is installed on the fixture plate, and a locking block is formed at the end of the anti-detachment block. The locking block is movably engaged in the locking groove to press the main body against the positioning block.

[0016] In the aforementioned spot welding fixture for the inner and outer panels of the C-pillar of the left rear door, the bottom wall of the clamping block along its length is further provided with several auxiliary blocks. Each auxiliary block is movable and presses against the stepped outer wall of the outer panel to limit the displacement of the outer panel relative to the inner panel.

[0017] In the aforementioned spot welding fixture for the inner and outer panels of the left rear door C-pillar, an adjusting shim is also installed between the auxiliary block and the clamping block.

[0018] The aforementioned spot welding fixture for the inner and outer panels of the left rear door C-pillar also includes:

[0019] A fixed bracket is provided on the tooling plate, and a first locking block is provided at the top of the fixed bracket. Locking cone blocks are symmetrically arranged on the first locking block.

[0020] The connecting frame and the pickup cylinder are provided. One end of the connecting frame is installed on the top of the fixed bracket, and the other end is used to connect to an external robot arm. The pickup cylinder is installed on the connecting frame, and a second locking block is connected to the output end of the pickup cylinder. The second locking block is provided with a locking cone groove, which is movably engaged and pressed against the locking cone block.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The spot welding fixture for the inner and outer panels of the C-pillar of the left rear door of this utility model has a distance from the output end of the drive component to the rotation center that is less than the distance from the clamping end to the rotation center. The application of this lever principle not only saves operating force, but also ensures that the clamping block can be extended from one side of the main body to the top of the extension for effective clamping, adapting to the needs of different shaped parts, greatly improving production efficiency. While ensuring stable fitting of the inner and outer panels, it can also provide sufficient welding operation space for the spot welding machine on one side of the extension, thereby enhancing the quality and strength of the welded joint.

[0023] (2) The limiter can play an auxiliary limiting role when the pressing block presses the top wall of the outer plate, so as to avoid product deformation or even scrapping due to excessive pressing force.

[0024] (3) Several auxiliary blocks can be pressed against the outer wall at different positions on the outer plate step after the clamping block rotates once. This makes operation convenient. At the same time, the adjustment of the position of the auxiliary blocks relative to the tooling plate with the adjustment shims helps to improve the fit between the two plates during welding. Attached Figure Description

[0025] Figure 1 This is a perspective view of this application;

[0026] Figure 2 yes Figure 1 A schematic diagram of the installation structure after removing the inner and outer panels;

[0027] Figure 3 This is a schematic diagram of the installation structure of the clamping mechanism;

[0028] Figure 4 This is a schematic diagram of the installation structure between the pickup cylinder, the first locking block, and the second locking block.

[0029] In the diagram, 10 is the inner panel; 11 is the outer panel; 120 is the main body; and 121 is the extension.

[0030] 2. Tooling plate; 20. Anti-detachment block; 200. Clamping block;

[0031] 3. Support block; 30. Mounting part; 300. Connecting hole; 31. Support part; 310. Extension block;

[0032] 4. Positioning block;

[0033] 5. Clamping mechanism; 50. Clamping block; 500. Auxiliary block; 501. Adjusting shim; 51. Rotating block; 510. Rotating part; 511. Connecting part; 512. Assembly part; 52. First mounting seat; 520. Mounting groove; 521. Connecting shaft; 522. Connecting block; 523. Limiter; 53. Second mounting seat; 54. Driving component;

[0034] 60. Fixed bracket; 61. First locking block; 610. Locking cone block; 62. Connecting frame; 63. Pick-up cylinder; 64. Second locking block; 640. Locking cone groove. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0037] Example 1:

[0038] like Figures 1 to 4 As shown, this utility model discloses a spot welding fixture for the inner and outer panels 11 of the C-pillar of the left rear door, used to achieve the positioning and installation of the inner panel 10 and the outer panel 11. It includes: a fixture plate 2; several support blocks 3 and positioning blocks 4, disposed on the fixture plate 2; both the inner panel 10 and the outer panel 11 have a main body 120 and an extension 121, the extension 121 being connected to one end of the main body 120 and extending outward along the width direction of the main body 120; the support blocks 3 supporting the main body 120 and the extension 121 above the fixture plate 2; the side of the main body 120 away from the extension 121 movably abuts against the positioning blocks 4 to restrict the placement position of the inner and outer panels 11 on the fixture plate 2; and a clamping mechanism. 5. The clamping mechanism 5, which is set on the tooling plate 2, includes a clamping block 50 and a rotating block 51. The mounting end of the clamping block 50 is connected to the rotating block 51. The clamping end of the clamping block 50 is used to press the outer plate 11 onto the inner plate 10. The end of the rotating block 51 away from the clamping block 50 is connected to the output end of the clamping mechanism 5. It is used to drive the clamping block 50 closer to or further away from the outer plate 11. The distance from the output end of the clamping mechanism 5 to the rotation center of the rotating block 51 is less than the distance from the clamping end to the rotation center of the rotating block 51. This allows the clamping block 50 to extend from one side of the main body 120 to the top of the extension 121 and clamp and fix it, so that the spot welding machine can weld the two overlapping extensions 121 into one piece.

[0039] This solution is primarily designed to enable the welding of the inner plate 10 and the outer plate 11, both of which have a main body 120 (arranged in an elongated shape) and an extension 121. Specifically, as shown... Figures 1 to 3As shown, since the welding position of the two is located at the periphery of the extension 121, welding space needs to be reserved for the spot welding machine (not shown in the figure) outside the tooling plate 2. The operator first prepares the inner plate 10 and the outer plate 11, ensuring that they meet the design specifications, and cleans the welding surfaces to remove any impurities or oxides that may affect the welding quality. During the positioning and installation process, the inner plate 10 (which has the main body 120 and the extension 121) sits on the support block 3 and, by abutting against the side wall of the positioning block 4, provides a stable platform for the placement of the outer plate 11. This structure can quickly and accurately complete the initial positioning of the inner and outer plates 11. This reduces errors caused by human factors and ensures that the two are in the correct welding position. After the inner and outer plates 11 are correctly placed, the clamping mechanism 5 can drive the clamping block 50 to move above the outer plate 11 through the rotating block 51 and clamp and fix the top wall of the outer plate 11. During this process, since the distance from the output end of the clamping mechanism 5 to the rotation center of the rotating block 51 is less than the distance from the clamping end to the rotation center of the rotating block 51, a lever effect is formed, which allows the clamping block 50 to easily extend from one side of the main body 120 to the top of the extension 121 and apply sufficient pressure to firmly press the outer plate 11 onto the inner plate 10. As can be seen, this structure optimizes the application of clamping force by utilizing the lever principle, ensuring a uniform and stable clamping effect even on complex-shaped parts. This not only ensures that the inner and outer plates 11 remain tightly fitted throughout the welding process, avoiding potential displacement issues during welding, but also provides sufficient welding space for the spot welding machine on the side of the extension 121 away from the main body 120. This effectively prevents positional interference between the spot welding head and the clamping block 50 during welding, significantly improving welding quality and production efficiency, while also improving the operating environment and reducing labor intensity.

[0040] The support block 3 includes a mounting part 30 and a support part 31. The mounting part 30 has a connection hole 300, which can be installed on the tooling plate 2 by fasteners. The support part 31 is arranged in a vertical direction and is connected to the mounting part 30 by an extension block 310, so that the support part 31 can support the inner plate 10 and the outer plate 11 in a horizontal position.

[0041] Preferably, such as Figure 2As shown, in this embodiment, the mounting part 30 can be adjusted on the tooling plate 2 according to the actual shape of the product. Since threaded holes (not shown in the figure) are distributed at different positions on the tooling plate 2, after the connecting hole 300 is aligned with the threaded hole, a fastener can be passed through the connecting hole 300 and connected to the threaded hole, thereby fixing the mounting part 30 in the required position. Preferably, the fastener in this embodiment can be replaced by screws, bolts, or other connecting parts 511. The extension block 310 in this embodiment is inclined, mainly to ensure that the support part 31 is accurately positioned on the bottom wall of the product at the specified position. In other words, the presence of the extension block 310 not only strengthens the overall structural rigidity of the support block 3, but also acts as an auxiliary device for height fine-tuning (adjusted directly during the manufacturing process), ensuring that even on parts with complex geometries, uniform support force can be provided.

[0042] More preferably, a locking groove (not shown in the figure) is formed on the side of the main body 120 near the extension 121. The locking groove is U-shaped and the opening direction is away from the positioning block 4. By installing the anti-detachment block 20 on the tooling plate 2, the locking block 200 formed at the end of the anti-detachment block 20 (facing the positioning block 4) is movably locked in the locking groove. This can provide a clear positioning reference to ensure that the main body 120 can reach the designated welding position every time. At the same time, it simplifies the placement process and facilitates the improvement of work efficiency during positioning and installation.

[0043] The clamping mechanism 5 further includes: a first mounting base 52, which is disposed on the tooling plate 2, and a rotating block 51 is hinged to the first mounting base 52; a second mounting base 53, which is disposed on the tooling plate 2 and spaced apart from the first mounting base 52, and a driving member 54 is movably hinged on the second mounting base 53. The output end of the driving member 54 is hinged to the rotating block 51 so that when the rotating block 51 rotates, it can drive the clamping block 50 to move closer to or away from the inner and outer plates 11.

[0044] More preferably, such as Figure 2 and Figure 3 As shown, after the support part 31 and the positioning block 4 provide stable positioning support for the inner and outer plates 11, the output end of the drive member 54 can drive the rotating block 51 along... Figure 3Rotating counterclockwise, the clamping block 50, connected to the rotating block 51, gradually approaches and presses against the top wall of the outer plate 11. The introduction of the driving component 54 automates the pressing process, reducing the need for manual intervention, improving work efficiency, and reducing labor intensity. Furthermore, the driving component 54 and its output end are hinged to the second mounting base 53 and the first mounting base 52 respectively, ensuring the clamping block 50 accurately reaches the predetermined position and preventing structural deformation or positional interference from affecting the fit between the outer plate 11 and the inner plate 10. It should be noted that the driving component 54 in this embodiment can be replaced by other driving devices such as hydraulic drive or cylinder drive.

[0045] The rotating block 51 consists of a rotating part 510, a connecting part 511, and an assembly part 512. A mounting groove 520 is provided in the first mounting base 52, and the rotating part 510 is movably disposed in the mounting groove 520. The connecting part 511 connects to the rotating part 510 and extends to the outside of the first mounting base 52 for connection to the output end of the drive component 54. The assembly part 512 is vertically connected to the rotating part 510, and the clamping block 50 is detachably connected to the assembly part 512.

[0046] More preferably, such as Figure 3 As shown, in this embodiment, both the connecting part 511 and the assembly part 512 use the rotating part 510 as the rotation center to achieve their respective operations. Preferably, this embodiment also provides a connecting shaft 521 in the first mounting base 52. The connecting shaft 521 passes through the mounting groove 520 and the rotating part 510, thereby realizing the movable connection between the rotating part 510 and the first mounting base 52. This installation method has a simple overall structure and is convenient for subsequent maintenance and replacement. Therefore, by designing the rotating part 510 in the mounting groove 520 with the connecting shaft 521 as the rotation center, the stability and accuracy of the clamping block 50 during rotational clamping are ensured, reducing errors caused by friction or other factors, and improving the accuracy of the clamping block 50 reaching the predetermined position. In addition, as Figure 3 As shown, at the connection between the output end of the drive member 54 and the connecting part 511, the distance between the connecting part 511 and the rotating part 510 is smaller than the distance between the rotating part 510 and the connecting part 511. Figure 3 The distance between the leftmost end (i.e. the clamping end) of the clamping block 50 shown can be increased by cleverly utilizing the leverage effect, so that a greater clamping force can be obtained without adding an additional power source. This saves energy, improves the reliability of the system, and ensures the normal welding operation of the spot welding machine on the inner and outer plates 11.

[0047] Preferably, assembly part 512 and Figure 3 The mounting connection at the right end of the clamping block 50 shown can also be achieved by using screws, bolts, and other connecting parts 511 for quick installation and disassembly. This facilitates timely disassembly and replacement of the clamping block 50 in case of wear or damage, improving production flexibility and efficiency.

[0048] Preferably, in this embodiment, a connecting block 522 is also provided on the side wall of the first mounting base 52, such as... Figure 3 As shown, by installing a limiter 523 on the connecting block 522 to provide a clear termination point, it is ensured that the clamping block 50 applies the same amount of pressure in each clamping operation, avoiding the risk of deformation or damage to the inner and outer plates 11 due to over-clamping, and improving welding quality and production consistency.

[0049] Several auxiliary blocks 500 are also distributed on the bottom wall of the clamping block 50 along its length. Each auxiliary block 500 can be moved to press against the stepped outer wall of the outer plate 11 to limit the displacement of the outer plate 11 relative to the inner plate 10.

[0050] like Figure 1 and Figure 3 As shown, since the main body 120 and the extension 121 are arranged in a stepped shape, the auxiliary blocks 500 of different heights can be installed on the bottom wall of the same clamping block 50 at the same time. This ensures the uniformity of the installation reference position and allows multiple auxiliary blocks 500 to act on different parts of the outer plate 11 at the same time, which enhances the overall fixing effect, ensures good fit, and effectively prevents the outer plate 11 from slipping or shifting slightly during the welding process, especially when the outer plate 11 has a complex geometry.

[0051] Preferably, in this embodiment, an adjusting shim 501 may be installed between the auxiliary block 500 and the pressing block 50. It should be noted that the adjusting shim 501 has different thickness specifications. By replacing the adjusting shim 501 with different specifications, the pressing point of the auxiliary block 500 on the outer plate 11 can be finely adjusted to compensate for the processing error generated during the manufacturing of the bottom wall of the pressing block 50.

[0052] Example 2:

[0053] This solution also includes: a fixed bracket 60, which is set on the tooling plate 2. The top of the fixed bracket 60 is equipped with a first locking block 61, and locking cone blocks 610 are symmetrically arranged on the first locking block 61; a connecting frame 62 and a pickup cylinder 63. One end of the connecting frame 62 is installed on the top of the fixed bracket 60, and the other end is used to connect to an external robot arm; the pickup cylinder 63 is installed on the connecting frame 62, and a second locking block 64 is connected to the output end of the pickup cylinder 63. The second locking block 64 is provided with a locking cone groove 640, which is movably engaged and pressed against the locking cone block 610.

[0054] like Figure 1 and Figure 4As shown, based on the above embodiment one, each fixture plate 2 can have the structure in this embodiment two. Specifically, when it is necessary to replace the fixture near the spot welding machine, the pick-up cylinder 63 can drive the second locking block 64 to gradually approach the first locking block 61 in the horizontal direction. The connection between the two locking blocks is effectively realized through the cooperation design of the locking cone groove 640 and the locking cone block 610. Relying on the installation and connection of the external robot (not shown in the figure) and the connecting frame 62, the entire fixture plate 2 and its components can be moved away from the spot welding machine to facilitate the placement of other fixtures. This structure replaces the manual handling of fixtures, reduces the need for manual intervention, improves work efficiency, and reduces labor intensity. Moreover, the locking cone block 610 and the locking cone groove 640 use the mutual abutment between the two inclined surfaces to improve the stability of the connection between the two locking blocks, thereby ensuring the smoothness of fixture replacement.

[0055] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0057] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A spot welding fixture for the inner and outer panels of the left rear door C-pillar, used to achieve positioning and installation of the inner and outer panels, characterized in that, include: Tooling plate; Several support blocks and positioning blocks are disposed on the tooling plate. Both the inner plate and the outer plate have a main body and an extension. The extension is connected to one end of the main body and extends outward along the width direction of the main body. The support blocks are used to support the main body and the extension above the tooling plate. The side of the main body away from the extension moves against the positioning block to restrict the placement position of the inner and outer plates on the tooling plate. A clamping mechanism is provided on the tooling plate. The clamping mechanism includes a clamping block and a rotating block. The mounting end of the clamping block is connected to the rotating block. The clamping end of the clamping block is used to movably clamp the outer plate onto the inner plate. The end of the rotating block away from the clamping block is connected to the output end of the clamping mechanism. It is used to drive the clamping block closer to or away from the outer plate. The distance from the output end of the clamping mechanism to the rotation center of the rotating block is less than the distance from the clamping end to the rotation center of the rotating block. This allows the clamping block to extend from one side of the main body to above the extension and clamp and fix it, so that the spot welding machine can weld the two overlapping extensions into one piece.

2. The spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 1, characterized in that, The clamping mechanism further includes: A first mounting base is disposed on the tooling plate, and the rotating block is hinged to the first mounting base; A second mounting base is disposed on the tooling plate and spaced apart from the first mounting base. A driving component is movably hinged to the second mounting base. The output end of the driving component is hinged to the rotating block so that when the rotating block rotates, it can drive the clamping block to move closer to or away from the inner and outer plates.

3. The spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 1, characterized in that, The support block includes a mounting part and a support part. The mounting part has a connecting hole, which can be installed on the tooling plate by fasteners. The support part is arranged in a vertical direction and is connected to the mounting part by an extension block, so that the support part can support the inner plate and the outer plate in a horizontal position.

4. A spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 2, characterized in that, The rotating block consists of a rotating part, a connecting part, and an assembly part. The first mounting base has a mounting groove, and the rotating part is movably disposed in the mounting groove. The connecting part connects to the rotating part and extends to the outside of the first mounting base for connection of the output end of the driving component. The assembly part is vertically connected to the rotating part, and the clamping block is detachably connected to the assembly part.

5. A spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 4, characterized in that, The first mounting base is provided with a connecting shaft, which passes through the mounting groove and the rotating part, so that the clamping block can rotate around the axis of the connecting shaft.

6. A spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 4, characterized in that, A connecting block is also provided on the side wall of the first mounting base, and a limiter is provided on the connecting block. The bottom wall of the assembly part is movably pressed against the limiter.

7. A spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 1, characterized in that, A locking groove is formed on the side of the main body near the extension. An anti-detachment block is installed on the tooling plate. A locking block is formed at the end of the anti-detachment block. The locking block is movably engaged in the locking groove to press the main body against the positioning block.

8. A spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 1, characterized in that, The bottom wall along the length of the clamping block is also provided with several auxiliary blocks. Each auxiliary block can be moved to press against the stepped outer wall of the outer plate to limit the displacement of the outer plate relative to the inner plate.

9. A spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 8, characterized in that, An adjusting shim is also installed between the auxiliary block and the clamping block.

10. A spot welding fixture for the inner and outer panels of the left rear door C-pillar according to claim 1, characterized in that, Also includes: A fixed bracket is provided on the tooling plate, and a first locking block is provided at the top of the fixed bracket. Locking cone blocks are symmetrically arranged on the first locking block. The connecting frame and the pickup cylinder are provided. One end of the connecting frame is installed on the top of the fixed bracket, and the other end is used to connect to an external robot arm. The pickup cylinder is installed on the connecting frame, and a second locking block is connected to the output end of the pickup cylinder. The second locking block is provided with a locking cone groove, which is movably engaged and pressed against the locking cone block.

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