Automobile structural member welding fixture

Abstract

The application discloses a kind of automobile structural member welding jigs, it is related to automobile structural member welding technical field, including welding station, the top wall middle part of welding station is equipped with the support table of supporting to be processed piece, and the top wall front and rear of welding station is symmetrically provided with welding mechanism, the front and rear of support table is symmetrically provided with main clamping mechanism assembled in the top wall of welding station, and main clamping mechanism is equipped with auxiliary clamping mechanism.The advantages are that: through the cooperation of profiling block and upper clamping frame, lower clamping frame comprehensively clamps arc-shaped connection, avoids the existence of gap in welding point position, prevents the occurrence of weak welding, false welding, and at the same time enhances the stability of clamping; by cooperating with welding mechanism and auxiliary clamping mechanism, the profiling block is driven to avoid position for spot welding by the movement of welding mechanism, to prevent interference on welding; at the same time, the arc-shaped connection of spot welding position is pressed and smoothed, to avoid the gap around the welding spot, which is conducive to improving the welding quality.

Description

Technical Field

[0001] This invention relates to the field of automotive structural component welding technology, and more particularly to an automotive structural component welding fixture. Background Technology

[0002] Automotive structural components are metal parts that form the car body frame and bear the main loads (such as impact force, gravity, and torsion). The main structural components include: front and rear longitudinal beams, A / B / C / D pillars, roof longitudinal beams and crossbeams, etc. Among them, the upper longitudinal beam in the front longitudinal beam system is a specific component in the front body structure. In order to improve the bending strength and torsional stiffness of the upper longitudinal beam, double-sided resistance spot welding is used to spot weld the upper longitudinal beam body and the reinforcing frame during processing.

[0003] Currently, in the process of double-sided resistance spot welding, the upper longitudinal beam body and the reinforcing plate need to be clamped and positioned to ensure the strength and accuracy of the weld. Some spot welded connections between the upper longitudinal beam body and the reinforcing frame are arc-shaped. For arc-shaped structures, multiple clamping points are usually used for partial clamping, or large-area segmented clamping is performed using contour-following blocks to prevent shape distortion of the arc-shaped structure during welding. However, when using multiple clamping points for partial clamping, the arc-shaped connections between the clamping points are not tightly fitted. During welding, the upper plate at the arc-shaped connection melts and does not adhere firmly to the lower plate, resulting in weak welds and incomplete welds, reducing the weld quality. Secondly, when using contour-following blocks to perform large-area clamping, the position of the contour-following blocks and fixtures is relatively fixed after clamping, which may interfere with the welding position and affect flexible welding.

[0004] Therefore, in order to improve the stability and tightness of clamping and improve welding quality, this invention provides a welding fixture for automotive structural parts. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art, and to propose a welding fixture for automotive structural parts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a welding fixture for automotive structural parts, including a welding table, a support platform for supporting the workpiece to be processed is installed in the middle of the top wall of the welding table, and welding mechanisms are symmetrically arranged in the front and rear parts of the top wall of the welding table. A main clamping mechanism is symmetrically arranged in the front and rear of the support platform and mounted on the top wall of the welding table, and an auxiliary clamping mechanism is provided on the main clamping mechanism.

[0007] The main clamping mechanism includes two support seats that are bolted to the top wall of the welding table. The two support seats are provided with a lower clamping frame and an upper clamping frame for supporting the workpiece from the bottom and pressing it from the top. The middle part of the lower clamping frame and the upper clamping frame is arc-shaped to match the workpiece.

[0008] The auxiliary clamping mechanism includes a movable clamping component disposed on the lower clamping frame and the upper clamping frame. The movable clamping component and the corresponding lower clamping frame and upper clamping frame are jointly provided with a cooling and avoidance component. The movable clamping component and the lower clamping frame cooperate to fully support the workpiece to be processed, and the movable clamping component and the upper clamping frame cooperate to fully press the workpiece to be processed. Before welding, the workpiece to be processed is fully clamped from both the top and bottom directions. The movable clamping component and the cooling and avoidance component cooperate to reposition and avoid the processing point during welding processing, and to cool and avoid the weld point after welding is completed.

[0009] In the aforementioned automotive structural component welding fixture, the welding mechanism includes a welding robot mounted on the top wall of the welding table. The welding robot is equipped with an upper welding head and a lower welding head, respectively, and the ends of the upper and lower welding heads that are away from the welding end are fitted with tapered sleeves.

[0010] In the aforementioned automotive structural component welding fixture, the left and right ends of the lower clamping frame and the upper clamping frame are connected by electric push rods. The support base is fixedly connected between the bottom walls of the left and right ends of the lower clamping frame and the top wall of the welding table. The height of the two support bases is adapted to the height of the two ends of the lower clamping frame, respectively.

[0011] In the aforementioned automotive structural component welding fixture, the movable clamping assembly includes a movable slot 1, and multiple movable slots 1 facing forward and backward are equidistantly provided on both the lower clamping frame and the upper clamping frame along the circumferential direction. An L-shaped frame is symmetrically slidably connected to the movable slot 1 by a spring 1. A semi-circular groove is provided in the middle of the side of the horizontal section of the L-shaped frame that is close to each other.

[0012] In the above-mentioned automotive structural component welding fixture, an L-shaped traction component is fixedly connected to the middle of the vertical section of the L-shaped frame, and a contour block is sleeved on the outside of the L-shaped traction component. The inside of the contour block is provided with a groove 1 for the L-shaped traction component to slide back and forth. The lower clamping frame and the upper clamping frame are provided with a movable groove 2 that penetrates the middle of the movable groove 1 on the side wall near the workpiece to be processed. The movable groove 2 corresponds to the welding point.

[0013] In the aforementioned automotive structural component welding fixture, the cooling avoidance component includes a wedge-shaped part, and the wedge-shaped part is fixedly connected to the side of the contour block near the L-shaped frame, with the top wall of the wedge-shaped part being inclined.

[0014] In the aforementioned automotive structural component welding fixture, the lower clamping frame and the upper clamping frame are symmetrically provided with vertically penetrating movable grooves three, which are connected to movable groove one. Movable groove three is connected to a wedge-shaped piece two through a spring two sliding vertically.

[0015] In the aforementioned automotive structural component welding fixture, the second wedge is composed of a sliding plate slidably connected to the third movable groove and a wedge block fixed to the side wall of the sliding plate. The bottom wall of the wedge block is inclined to match the first wedge, and the bottom wall of the L-shaped frame has a slot two for the third movable groove to pass through.

[0016] In the aforementioned automotive structural component welding fixture, four blocks are fixedly connected in a matrix on the movable slot, and the left and right opposite blocks are symmetrically connected to movable protrusions on the side that is close to each other by springs.

[0017] In the aforementioned automotive structural component welding fixture, the movable protrusion located at the end outside the stop block is formed by two inclined surfaces into an arrow shape, and the left and right side walls of the contour block are provided with grooves that are compatible with the stop block.

[0018] Compared with existing technologies, the advantages of this invention are as follows: 1. By using the contour blocks and the upper and lower clamping frames in conjunction, the arc-shaped connection is fully clamped, avoiding gaps at the welding points and preventing weak or incomplete welds, while also enhancing the stability of the clamping; the upper and lower clamping frames tightly clamp the non-welded parts of the arc-shaped connection of the upper longitudinal beam body and the arc-shaped connection of the reinforcing frame; the two contour blocks tightly clamp the welding points not clamped by the lower and upper clamping frames in both vertical and horizontal directions.

[0019] 2. The welding mechanism and the auxiliary clamping mechanism work together. The movement of the welding mechanism drives the contour block to make way for the spot welding operation, preventing interference with the welding. The conical sleeve drives the contour block to make way for the downward movement of the upper welding head for the spot welding operation. At the same time, when the contour block moves, it presses and smooths the arc-shaped connection at the spot welding position to avoid gaps around the weld point, which helps to improve the welding quality.

[0020] 3. By cooperating with the movable clamping component and the cooling avoidance component, the two corresponding movable protrusions on the left and right sides lock the position of the same contour block after it has slid from the left and right directions, preventing the contour block from damaging the spot weld surface that has just been welded, giving the spot weld position cooling time, and ensuring welding quality. Attached Figure Description

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the overall structure.

[0023] Figure 2 (a) is a structural schematic diagram of the upper longitudinal beam body, (b) is a structural schematic diagram of the reinforcing frame, and (c) is a structural schematic diagram of the upper longitudinal beam body and the reinforcing frame after welding.

[0024] Figure 3This is a schematic diagram of the welding mechanism.

[0025] Figure 4 A schematic diagram of the main clamping mechanism.

[0026] Figure 5 This is a partial structural exploded view of the active clamping component.

[0027] Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0028] Figure 7 (a) is a schematic diagram of the state before the active bump locks the contour block, and (b) is a schematic diagram of the state after the active bump locks the contour block.

[0029] Figure 8 This is a partial structural cross-sectional view of the movable clamping component.

[0030] Figure 9 A cross-sectional view of a portion of the structure to allow for cooling and avoidance of components.

[0031] Figure 10 (a) is a schematic diagram of the position of the profiling block before welding, and (b) is a schematic diagram of the position of the profiling block during welding.

[0032] Figure 11 (a) shows the position of the L-shaped frame and L-shaped traction component during welding, and (b) shows the position of the L-shaped frame and L-shaped traction component after welding.

[0033] Figure 12 (a) is a schematic diagram of the state of the contour block before the second wedge slides down, and (b) is a schematic diagram of the state of the contour block after the second wedge slides down.

[0034] In the diagram: 1. Welding table; 2. Support table; 3. Welding mechanism; 31. Welding robot; 32. Upper welding head; 33. Lower welding head; 34. Conical sleeve; 4. Main clamping mechanism; 41. Support base; 42. Lower clamping frame; 43. Upper clamping frame; 5. Auxiliary clamping mechanism; 51. Movable clamping assembly; 511. Movable slot one; 512. L-shaped frame; 513. L-shaped traction component; 514. Contouring block; 515. Movable slot two; 52. Cooling and clearance assembly; 521. Wedge one; 522. Movable slot three; 523. Wedge two; 524. Stop; 525. Movable protrusion. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Reference Figures 1 to 2 A welding fixture for automotive structural parts includes a welding table 1, a support platform 2 for supporting the workpiece to be processed is installed in the middle of the top wall of the welding table 1, welding mechanisms 3 are symmetrically arranged at the front and rear of the top wall of the welding table 1, a main clamping mechanism 4 is symmetrically arranged at the front and rear of the support platform 2 and mounted on the top wall of the welding table 1, and an auxiliary clamping mechanism 5 is arranged on the main clamping mechanism 4.

[0037] The aforementioned parts to be processed are the upper longitudinal beam and the reinforcing frame in automotive structural components. During processing, double-sided spot welding is used to spot weld the arc-shaped connection between the upper longitudinal beam body and the reinforcing frame.

[0038] Before welding, the reinforcing frame is supported by the support platform 2, and then the upper longitudinal beam body is aligned with the reinforcing frame and placed. After placement, it is fully clamped by the main clamping mechanism 4 and the auxiliary clamping mechanism 5. During welding, spot welding is performed by the welding mechanism 3. When the welding mechanism 3 performs spot welding at different positions, the auxiliary clamping mechanism 5 is adjusted on the main clamping mechanism 4 to avoid interference with the processing points during welding. After welding, the weld point position is also avoided to prevent affecting cooling. After the two corresponding main clamping mechanisms 4 clamp the corresponding arc-shaped connection, the two welding mechanisms 3 perform spot welding simultaneously.

[0039] Reference Figure 1 and Figure 3 The welding mechanism 3 includes a welding robot 31 mounted on the top wall of the welding table 1. The welding robot 31 is equipped with an upper welding head 32 and a lower welding head 33, which are respectively mounted on the upper and lower sides. The ends of the upper welding head 32 and the lower welding head 33 that are away from the welding end are both fitted with conical sleeves 34.

[0040] Reference Figure 1 and Figure 4 The main clamping mechanism 4 includes two support seats 41 that are bolted to the top wall of the welding table 1. The two support seats 41 are provided with a lower clamping frame 42 and an upper clamping frame 43 for supporting the workpiece and pressing it down. The middle part of the lower clamping frame 42 and the upper clamping frame 43 is arc-shaped to match the workpiece. The left and right ends of the lower clamping frame 42 and the upper clamping frame 43 are connected by electric push rods. The support seats 41 are fixedly connected between the bottom walls of the left and right ends of the lower clamping frame 42 and the top wall of the welding table 1. The height of the two support seats 41 is adapted to the height of the two ends of the lower clamping frame 42.

[0041] Reference Figure 1 , Figure 4 , Figure 5 and Figure 6 The auxiliary clamping mechanism 5 includes a movable clamping component 51 disposed on the lower clamping frame 42 and the upper clamping frame 43. The movable clamping component 51 and the corresponding lower clamping frame 42 and upper clamping frame 43 are jointly provided with a cooling and clearance component 52. The movable clamping component 51 and the lower clamping frame 42 cooperate to fully support the workpiece to be processed, and the movable clamping component 51 and the upper clamping frame 43 cooperate to fully press the workpiece to be processed. Before welding, the workpiece to be processed is fully clamped from both the top and bottom directions. The movable clamping component 51 and the cooling and clearance component 52 cooperate to reposition and clearance the processing point during welding processing, and to cool and clearance the weld point after welding is completed.

[0042] Reference Figures 4 to 9 The movable clamping assembly 51 includes a movable groove 511. Both the lower clamping frame 42 and the upper clamping frame 43 have multiple movable grooves 511 equidistantly spaced along the circumferential direction, facing forward and backward. An L-shaped frame 512 is symmetrically slidably connected to the movable groove 511 via a spring (not shown in the figure). A semi-circular groove is provided in the middle of the horizontal section of the L-shaped frame 512 that is close to each other. An L-shaped traction member 513 is fixedly connected to the middle of the vertical section of the L-shaped frame 512. A contour block 514 is sleeved on the outside of the L-shaped traction member 513. A groove 514 is provided inside the contour block 514 for the L-shaped traction member 513 to slide forward and backward. A movable groove 515 penetrating the middle of the movable groove 511 is provided on the side wall of the lower clamping frame 42 and the upper clamping frame 43 near the workpiece. The movable groove 515 corresponds to the welding point.

[0043] Reference Figures 4 to 9The cooling clearance assembly 52 includes a wedge-shaped component 521. The wedge-shaped component 521 is fixedly connected to the side of the contour block 514 near the L-shaped frame 512. The top wall of the wedge-shaped component 521 is inclined. The lower clamping frame 42 and the upper clamping frame 43 are symmetrically provided with vertically penetrating movable slots 522. The movable slots 522 are connected to the movable slot 511. The wedge-shaped component 523 is slidably connected to the movable slot 522 by a spring 2 (not shown in the figure). The wedge-shaped component 523 consists of a slide plate slidably connected to the movable slot 522 and a wedge-shaped block fixed to the side wall of the slide plate. The composition includes a wedge-shaped block whose bottom wall is inclined to match the wedge-shaped part 521, and an L-shaped frame 512 whose bottom wall has a slot 2 for the passage of the movable slot 3 522. Four stops 524 are fixedly connected in a matrix on the movable slot 1 511. The side of the left and right opposite stops 524 that are close to each other are symmetrically connected to movable protrusions 525 by springs 3 (not shown in the figure). The end of the movable protrusion 525 located outside the stop 524 is formed by two inclined surfaces to form an arrow shape. The left and right side walls of the contour block 514 have slots 3 that match the stop 524.

[0044] By retracting the output end of the hydraulic rod, the upper clamping frame 43 is adjusted to move closer to the lower clamping frame 42, tightly clamping the non-welded parts of the arc-shaped connection of the upper longitudinal beam body and the arc-shaped connection of the reinforcing frame. The bottom wall of the arc-shaped connection of the reinforcing frame is in contact with the arc-shaped top wall of the lower clamping frame 42, the arc-shaped connection of the upper longitudinal beam body overlaps with the arc-shaped connection of the reinforcing frame, and the arc-shaped bottom wall of the upper clamping frame 43 is in contact with the top wall of the arc-shaped connection of the upper longitudinal beam body.

[0045] It should be noted that the movable clamping components 51 and cooling clearance components 52 on the lower clamping frame 42 and the upper clamping frame 43 have the same component structure and working principle, but the installation direction and size are different. According to the curvature and length of the middle part of the lower clamping frame 42 and the upper clamping frame 43, the movable clamping components 51 on the lower clamping frame 42 and the upper clamping frame 43 are arranged vertically opposite each other, and the cooling clearance components 52 on the lower clamping frame 42 and the upper clamping frame 43 are arranged vertically opposite each other.

[0046] Before welding, the two corresponding contour blocks 514 are initially close to each other, and the contour blocks 514 on the lower clamping frame 42 and the upper clamping frame 43 correspond to each other. In the movable groove 515, the welding points not clamped by the lower clamping frame 42 and the upper clamping frame 43 are tightly clamped in both the upper and lower directions. The contour blocks 514 and the upper clamping frame 43, and the contour blocks 514 and the lower clamping frame 42 work together to fully clamp the arc-shaped connection, avoid gaps at the welding points, prevent weak welding and incomplete welding, and enhance the stability of clamping.

[0047] During welding, the welding robot 31 moves the corresponding upper welding head 32 and lower welding head 33 closer to the welding point. The upper welding head 32 and lower welding head 33 perform spot welding operations perpendicular to the point from the upper and lower directions, respectively.

[0048] by Figure 10 For example, when the upper welding head 32 is close to the corresponding welding point, a circular hole is formed between the semicircular grooves on the two corresponding L-shaped frames 512. The top wall of the semicircular groove of the L-shaped frame 512 is chamfered. The upper welding head 32 passes through the circular hole first, and the conical sleeve 34 moves closer and gradually pushes the two L-shaped frames 512 from the initial state of being close to each other to the state of being far apart.

[0049] As the two L-shaped frames 512 slide away from each other on the upper clamping frame 43, the L-shaped traction component 513 drives the contour block 514 to slide in the movable groove 515. The contour block 514 makes way for the downward movement of the upper welding head 32 to perform spot welding. At the same time, when the contour block 514 moves, it presses and smooths the arc-shaped connection at the spot welding position to avoid gaps around the weld point, which helps to improve the welding quality.

[0050] It should be noted that the contour block 514 is a detachable structure to facilitate the installation of the L-shaped traction component 513.

[0051] As the two L-shaped brackets 512 slide away from the upper clamping bracket 43, the inclined surface of the movable protrusion 525 is gradually pushed by the side wall of the contour block 514, sliding into the corresponding stop block 524. When the sliding stops, the spring three is compressed and rebounds, driving the movable protrusion 525 into the corresponding slot three. The two corresponding movable protrusions 525 lock the position of the same contour block 514 after sliding from the left and right directions (e.g., Figure 7 (As shown).

[0052] The contour block 514 moves wedge 1 521 closer to wedge 2 523 until the top wall of wedge 1 521 is in contact with the top wall of wedge 2 523. At this point, wedge 2 523 is in the following state: the bottom of the slide plate is tightly against the arc-shaped connection of the upper longitudinal beam body; spring 2 is compressed; and the bottom of the slide plate is at the same height as the bottom of the upper clamping frame 43. This state is as follows: Figure 10 As shown in Figure (b).

[0053] After welding at a single welding point is completed, the welding robot 31 moves the upper welding head 32, the lower welding head 33 and the corresponding conical sleeve 34 away from the welding point and continues to repeat the operation at the next welding point.

[0054] by Figure 11For example, as the conical sleeve 34 resets, the spring rebounds, causing the two L-shaped brackets 512 to gradually return from a state of separation to a state of proximity. During the reset, the L-shaped traction member 513 slides in the groove of the contour block 514 until it slides to the position shown in the figure. Figure 11 When the state shown in Figure (b) is reached, the reset is complete. The reset process of the L-shaped frame 512 will not cause the contour block 514 to move, thus preventing the contour block 514 from damaging the spot weld surface that has just been welded, allowing the spot weld position to cool down and ensuring the welding quality.

[0055] After all welding points have been completed, the hydraulic rod drives the lower clamping frame 42 and the upper clamping frame 43 to move away from each other, releasing the clamping force.

[0056] by Figure 12 For example, when the clamping is released and the bottom wall of the upper clamping frame 43 is no longer in close contact with the top wall of the arc-shaped connection, the bottom of the second wedge 523 is no longer under pressure. The second spring connecting the second wedge 523 and the upper clamping frame 43 rebounds, causing the second wedge 523 to slide downward on the third movable groove 522. The wedge block of the second wedge 523 pushes the first wedge 521 to move, and the contour block 514 changes from a state of being far apart to a state of being close together. The L-shaped traction member 513 and the contour block 514 change their relative positions to complete the reset, which is convenient for the next welding and clamping operation.

[0057] In this invention, the contour block 514 in the movable clamping assembly 51, together with the upper clamping frame 43 and the lower clamping frame 42, comprehensively clamps the arc-shaped connection, avoiding gaps at the welding point and preventing weak or incomplete welds. This also enhances clamping stability. Simultaneously, the movement of the welding mechanism 3 and the driving cooling and clearance assembly 52 work together to drive the contour block 514 in the movable clamping assembly 51 to clear space for the spot welding operation, preventing interference with the welding. During the clearance process, pressure is applied to smooth the surface, preventing gaps around the weld point and improving welding quality. After clearance, the position is locked to prevent damage to the spot weld surface. Although this invention adds the movable clamping assembly 51 and the cooling and clearance assembly 52 compared to existing technologies, increasing equipment costs, the technical solution of this invention not only comprehensively clamps the workpiece during spot welding but also allows for self-clearing and smoothing without external drive, significantly improving welding quality. Furthermore, the added mechanical parts are simple, and from a long-term economic perspective, the increased equipment cost compared to existing technologies is negligible.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" 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.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A welding fixture for automotive structural components, comprising a welding table, characterized in that, The welding table has a support platform installed in the middle of the top wall to support the workpiece to be processed, and welding mechanisms are symmetrically arranged at the front and rear of the top wall of the welding table. The main clamping mechanism is symmetrically arranged at the front and rear of the support platform and is mounted on the top wall of the welding table. The main clamping mechanism is equipped with an auxiliary clamping mechanism. The main clamping mechanism includes two support seats that are bolted to the top wall of the welding table. The two support seats are provided with a lower clamping frame and an upper clamping frame for supporting the workpiece from the bottom and pressing it from the top. The middle part of the lower clamping frame and the upper clamping frame is arc-shaped to match the workpiece. The auxiliary clamping mechanism includes a movable clamping component disposed on the lower clamping frame and the upper clamping frame. The movable clamping component and the corresponding lower clamping frame and upper clamping frame are jointly provided with a cooling and clearance component. The movable clamping component and the lower clamping frame cooperate to fully support the workpiece to be processed, and the movable clamping component and the upper clamping frame cooperate to fully press the workpiece to be processed. Before welding, the workpiece to be processed is fully clamped from both the top and bottom directions. The movable clamping component and the cooling and clearance component cooperate to reposition and clearance the processing point during welding and to cool and clearance the weld point after welding. The movable clamping assembly includes a movable slot 1, and multiple movable slots 1 facing forward and backward are equidistantly opened along the circumferential direction on both the lower clamping frame and the upper clamping frame. An L-shaped frame is symmetrically slidably connected to the movable slot 1 by a spring 1. A semi-circular groove is opened in the middle of the side of the horizontal section of the L-shaped frame that is close to each other. An L-shaped traction component is fixedly connected to the middle of the vertical section of the L-shaped frame, and a contour block is sleeved on the outside of the L-shaped traction component. The inside of the contour block is provided with a groove 1 for the L-shaped traction component to slide back and forth. The lower clamping frame and the upper clamping frame are provided with a movable groove 2 that passes through the middle of the movable groove 1 on the side wall near the workpiece to be processed. The movable groove 2 corresponds to the welding point. The cooling clearance assembly includes a wedge-shaped component, and the wedge-shaped component is fixedly connected to the side of the contour block near the L-shaped frame. The top wall of the wedge-shaped component is inclined. The lower clamping frame and the upper clamping frame are symmetrically provided with vertically penetrating movable grooves three, and the movable grooves three are connected to the movable groove one. A wedge-shaped piece two is slidably connected to the movable groove three through a spring two. The second wedge is composed of a sliding plate that is slidably connected to the third movable groove and a wedge block fixed to the side wall of the sliding plate. The bottom wall of the wedge block is inclined to match the first wedge. The bottom wall of the L-shaped frame has a slot two for the third movable groove to pass through.

2. The welding fixture for automotive structural components according to claim 1, characterized in that, The welding mechanism includes a welding robot mounted on the top wall of the welding table. The welding robot is equipped with an upper welding head and a lower welding head, respectively, and the ends of the upper and lower welding heads away from the welding end are fitted with conical sleeves.

3. The welding fixture for automotive structural components according to claim 1, characterized in that, The left and right ends of the lower clamping frame and the upper clamping frame are connected by electric push rods. The support base is fixedly connected between the bottom wall of the left and right ends of the lower clamping frame and the top wall of the welding table. The height of the two support bases is adapted to the height of the two ends of the lower clamping frame, respectively.

4. The welding fixture for automotive structural components according to claim 1, characterized in that, The movable groove has four blocks fixedly connected in a matrix, and the left and right opposite blocks are symmetrically connected to movable protrusions by springs on the side that is close to each other.

5. A welding fixture for automotive structural components according to claim 4, characterized in that, The movable protrusion is located at the end outside the stop block, which is formed by two inclined surfaces into an arrow shape. The left and right side walls of the contour block are provided with grooves that are adapted to the stop block.

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