Automobile frame cross beam welding supporting clamp and using method thereof

Abstract

The invention discloses an automobile frame cross beam welding supporting clamp and a using method thereof, and relates to the related technical field of automobile frame production, the automobile frame cross beam welding supporting clamp comprises a welding workbench and a plurality of driving mechanisms arranged on the workbench, the power output end of each driving mechanism is provided with an upper clamping block through a mounting frame, and the workbench is provided with a plurality of lower clamping blocks; the upper clamping blocks correspond to the lower clamping blocks in a one-to-one mode, the passive position calibration mechanism comprises upper bases arranged on the upper clamping blocks and lower bases arranged on the lower clamping blocks, calibration grooves are formed in the upper bases, and calibration rods are installed on the lower bases; in the inserting stroke of the calibration rods and the calibration grooves, the calibration grooves drive the corresponding upper clamping blocks and the corresponding lower clamping blocks to be aligned based on the extrusion effect of the calibration rods.

Description

Technical Field

[0001] The present invention relates to the technical field related to automobile frame production, in particular to an automobile frame crossbeam welding support fixture and a use method thereof. Background Art

[0002] As is well known, the automobile frame is the basic skeletal structure of a vehicle, supporting various components such as the body, engine, and chassis, making it a crucial component of the vehicle. Automobile frames come in various types, including side beams and center beams, and are primarily composed of longitudinal beams, cross beams, connectors, and reinforcements. These components are connected by welding, bolting, and riveting.

[0003] Among them, in the crossbeam welding process, it is necessary to support, clamp and fix it for welding processing. For example, the patent with publication number CN113732596B and publication date is June 9, 2023, and the name is "A welding fixture for the rear subframe and rear crossbeam combination in automobiles", which involves the technical field of automobile products, including lower side support components, middle positioning components, side positioning components, front side pressure support components, rear side pressure support components and rear side tightening components. The lower side support components are used to achieve The other components are used for support. The middle positioning component is used to position and support the middle part of the rear cross beam of the rear subframe. The side positioning components are used to position and support the two sides of the rear side of the rear cross beam of the rear subframe. The front pressing component is used to press and support the two sides of the front side of the rear cross beam of the rear subframe. The rear pressing component is used to press and support the two sides of the rear side of the rear cross beam of the rear subframe. The rear pressing component is used to press the middle part of the rear side of the rear cross beam of the rear subframe.

[0004] The shortcoming of the existing technology is that before welding the automobile frame crossbeam, it is necessary to use a tooling fixture to clamp the crossbeam and the parts that need to be welded and connected. The existing tooling fixture generally includes an upper clamping block that can be moved by a driving mechanism and a lower clamping block fixed on a workbench. The driving mechanism will inevitably cause mechanical wear in the process of repeatedly driving the upper clamping block to cooperate with the lower clamping block in the corresponding position to clamp the crossbeam and the parts that need to be connected. If the upper clamping block and the lower clamping block cannot be basically aligned due to mechanical wear, it will inevitably have an adverse effect on the crossbeam welding process. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding support fixture for an automobile frame crossbeam and a method for using the same, so as to solve the technical problems in the related art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A welding support fixture for automobile frame crossbeams includes a welding workbench and several drive mechanisms arranged on the workbench, the power output end of each drive mechanism is installed with an upper clamping block through a mounting frame, and several lower clamping blocks are installed on the workbench, and the several upper clamping blocks correspond to the several lower clamping blocks one by one. It also includes a passive position calibration mechanism, which includes an upper base arranged on each upper clamping block and a lower base arranged on each lower clamping block, a calibration groove is opened on the upper base, and a calibration rod is installed on the lower base; during the insertion stroke of the calibration rod and the calibration groove, the calibration groove drives the corresponding upper clamping block to align with the lower clamping block based on the extrusion effect of the calibration rod.

[0008] As mentioned above, positioning pins are arranged on the mounting frame and the workbench, and the positioning pins are used to be plugged into the positioning holes on the beam.

[0009] The above also includes a position adaptation mechanism, which includes a block installed at the power output end of the driving mechanism and a mounting seat with an inner cavity arranged on the mounting frame. The block is movably arranged in the mounting seat, and a first elastic member is provided between the two; when the calibration groove is squeezed by the calibration rod, the mounting seat and the block move relative to each other.

[0010] As mentioned above, the upper base is provided with a centering mechanism, and when the positions of the corresponding upper clamping block and the lower clamping block are calibrated and approach each other, the centering mechanism drives the block position to be centered with the mounting seat position.

[0011] As mentioned above, the centering mechanism includes two swing arms symmetrically arranged on the upper clamping block, and the ends of the two swing arms away from the upper clamping block are both installed with extrusion blocks. Based on the extrusion effect of the calibration rod, the two swing arms drive the two extrusion blocks to jointly extrude the block body.

[0012] As mentioned above, the swing axis of the swing lever is located close to the end squeezed by the calibration rod.

[0013] As mentioned above, the extrusion block is provided with an extrusion opening of a V-shaped structure, and the included angle of the extrusion opening is an obtuse angle.

[0014] As mentioned above, the upper clamping block and the lower clamping block are both provided with a cylinder on the surface for clamping the automobile frame cross beam, and a plurality of abutment rods are provided on the cylinder for sliding along the axial direction, and a second elastic member is provided between the abutment rod and the cylinder in the sliding direction. Based on the elastic force of the second elastic member, the abutment rod has a tendency to extend out of the cylinder, and a limiting mechanism is also provided on the cylinder. After clamping the automobile frame cross beam, the limiting mechanism limits the movement of each abutment rod.

[0015] As mentioned above, the end of the abutting rod for abutting against the automobile frame crossbeam is installed with a rubber pad through a spherical hinge, and a third elastic member is provided between the rubber pad and the abutting rod.

[0016] The present invention also relates to a method for using a support fixture for welding a cross member of an automobile frame. The method for supporting and clamping an automobile frame during welding using the support fixture for welding a cross member of an automobile frame comprises the following steps:

[0017] Step 1: Preliminary positioning: Place the automobile frame crossbeam on the workbench, and pre-plug the positioning pins on the workbench into the positioning holes on the crossbeam;

[0018] Step 2: Position calibration and positioning: the driving mechanism drives the upper clamping block to approach the lower clamping block. The position calibration mechanism first completes the position calibration of the upper clamping block and the lower clamping block. After the position calibration of the upper clamping block and the lower clamping block, the positioning pins on the mounting frame are plugged into the positioning holes on the beam to complete the re-positioning of the beam.

[0019] Step 3: Clamping and welding: the upper clamping block and the lower clamping block clamp the beam, and the welding equipment starts to weld the beam.

[0020] The beneficial effect of the present invention is that by setting corresponding calibration grooves and calibration rods, in the process of the driving mechanism driving the upper clamping block and the lower clamping block to clamp the crossbeam, the calibration groove passively drives the positions of the upper clamping block and the lower clamping block to align based on the squeezing effect of the calibration rod, thereby ensuring the stable clamping of the crossbeam and improving the welding quality of the crossbeam. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a welding support fixture for an automobile frame crossbeam provided in an embodiment of the present invention;

[0023] Figure 2 A schematic cross-sectional view of a passive position calibration mechanism of a welding support fixture for an automobile frame cross member provided by an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A in the figure shows the enlarged structural diagram;

[0025] Figure 4 A schematic cross-sectional view of a centering mechanism of a support fixture for welding a cross member of an automobile frame provided by an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the exploded structure of a cylinder, a limiting plate and an abutment rod of a support fixture for welding a cross member of an automobile frame provided by an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Workbench; 10. Support frame; 11. Mounting frame; 12. Upper clamping block; 13. Lower clamping block; 14. Positioning pin; 15. Cylinder; 16. Abutment rod; 160. Rubber pad; 17. Limiting socket; 18. Limiting plate; 19. Limiting insert; 2. Passive position calibration mechanism; 20. Upper base; 21. Calibration groove; 210. Front section; 211. Rear section; 22. Lower base; 23. Calibration rod; 230. Outer layer; 231. Inner layer; 3. Position adaptation mechanism; 30. Block; 31. Mounting seat; 32. Inner cavity; 4. Centering mechanism; 40. Swinging rod; 41. Extrusion block; 5. Transmission mechanism; 6. Driving mechanism. DETAILED DESCRIPTION

[0029] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1 To the attached Figure 5 The present invention is further described in detail.

[0030] The first embodiment of the present invention relates to a welding support fixture for automobile frame crossbeams, comprising a welding workbench 1 and a plurality of drive mechanisms arranged on the workbench 1, wherein the power output end of each drive mechanism 6 is mounted with an upper clamping block 12 through a mounting frame 11, and a plurality of lower clamping blocks 13 are mounted on the workbench 1, wherein the plurality of upper clamping blocks 12 correspond one to one to the plurality of lower clamping blocks 13, and further comprising a passive position calibration mechanism 2, which comprises an upper base 20 arranged on each upper clamping block 12 and a lower base 22 arranged on each lower clamping block 13, a calibration groove 21 being provided on the upper base 20, and a calibration rod 23 being mounted on the lower base 22; in the plug-in stroke between the calibration rod 23 and the calibration groove 21, the calibration groove 21 drives the corresponding upper clamping block 12 to align with the lower clamping block 13 based on the extrusion action of the calibration rod 23.

[0031] Specifically, a plurality of support frames 10 are provided on the welding workbench 1, and a driving mechanism is installed on each support frame 10. Then, the upper clamping block 12 is installed at the power output end of the driving mechanism through the mounting frame 11, and the lower clamping block 13 is directly installed on the support frame 10. For the clamping of the beam, it is generally clamped from three positions at both ends and the middle. Two clamping points are arranged on both sides of the width direction of each position. Therefore, there will be two pairs of corresponding upper clamping blocks 12 and lower clamping blocks 13 on each support frame 10, wherein the driving mechanism is powered by a driving motor or a driving cylinder, and then The power output end of the driving source directly or indirectly drives the mounting frame 11 to move linearly or swing in the direction of clamping the beam. The specific arrangement can be made according to actual needs. However, mechanical wear is inevitable in the process of the driving mechanism driving the upper clamping block 12 to cooperate with the lower clamping block 13 in the corresponding position to clamp the beam and the parts that need to be connected. If the upper clamping block 12 and the lower clamping block 13 cannot be basically aligned due to mechanical wear, it will inevitably have an adverse effect on the beam welding process, such as inaccurate positioning, unstable clamping, poor welding quality, severe equipment wear and other problems.

[0032] Therefore, based on the above technical problems, in this embodiment, by setting a passive position calibration mechanism 2, in the process of the upper clamping block 12 being driven close to the corresponding lower clamping block 13, the positions of the upper clamping block 12 and the lower clamping block 13 are calibrated in advance, so that the two can clamp the crossbeam in a basically aligned state, that is, an upper base 20 is installed on each upper clamping block 12, and a calibration groove 21 is opened on the upper base 20. The calibration groove 21 is divided into a boss-shaped front section 210 and a cylindrical rear section 211. The radial dimension of the front section 210 gradually decreases in the direction approaching the rear section 211. Then, a lower base 22 is installed on each lower clamping block 13, and a calibration rod 23 is installed on the lower base 22. The front end of the calibration rod 23 is conical, and when it contacts the front section 210 of the calibration groove 21, it can form an extrusion in a wedge-shaped manner. The pressure action, that is, in the process of the front end of the calibration rod 23 contacting with the front section 210 of the calibration groove 21 at any position, the front section 210 can give the calibration rod 23 a radial squeezing effect, so that the calibration rod 23 has a tendency to move toward the center of the front section 210, and due to mechanical wear on the driving mechanism, the position of the calibration rod 23 basically remains unchanged, the front section 210 gives the calibration rod 23 a radial squeezing effect, and the calibration rod 23 gives the front section 210 a reaction force, so that the center of the calibration groove 21 has a tendency to align with the center of the calibration rod 23. After the calibration rod 23 reaches the center of the front section 210 of the calibration groove 21, as the upper clamping block 12 and the lower clamping block 13 continue to approach, the calibration rod 23 will be inserted into the rear section 211, so that the position alignment of the upper clamping block 12 and the lower clamping block 13 can be achieved.

[0033] The beneficial effect of this embodiment is that by setting corresponding calibration grooves 21 and calibration rods 23, in the process of the driving mechanism driving the upper clamping block 12 and the lower clamping block 13 to clamp the beam, the calibration groove 21 passively drives the positions of the upper clamping block 12 and the lower clamping block 13 based on the squeezing effect of the calibration rod 23, thereby ensuring the stable clamping of the beam and improving the welding quality of the beam.

[0034] Preferably, positioning pins 14 are arranged on the mounting frame 11 and the workbench 1, and the positioning pins 14 are used to be plugged into the positioning holes on the beam; specifically, the positioning pins 14 are aligned and plugged into the positioning holes on the beam, which can basically fix the position of the beam in advance, so that in the process of the upper clamping block 12 and the lower clamping block 13 cooperating to clamp the beam, the position of the beam will basically not change due to the squeezing of the upper clamping block 12 and the lower clamping block 13.

[0035] Furthermore, it also includes a position adaptation mechanism 3, which includes a block 30 installed at the power output end of the driving mechanism and a mounting seat 31 with an inner cavity 32 arranged on the mounting frame 11. The block 30 is movably arranged in the mounting seat 31, and a first elastic member is provided between the two; when the calibration groove 21 is squeezed by the calibration rod 23, the mounting seat 31 and the block 30 move relative to each other.

[0036] Specifically, in the aforementioned embodiment, when the calibration rod 23 is plugged into the calibration groove 21, the interaction force between the two will force the position of the driving mechanism where mechanical wear occurs to return to the initial position where there is no wear (that is, mechanical wear will occur between the components in the driving mechanism during movement, and the positions of the matching components will inevitably change compared to when no wear occurs). In this way, the mutual wear between the calibration rod 23 and the calibration groove 21 increases, thereby adversely affecting the calibration of the positions of the upper clamping block 12 and the lower clamping block 13.

[0037] Therefore, in this embodiment, the position adaptation mechanism 3 is arranged between the mounting frame 11 and the power output end of the driving source, that is, the output end of the power source is installed with a block 30, and the position of the block 30 changes with the position change of the output end, and then the mounting seat 31 is installed on the mounting frame 11, and an inner cavity 32 is provided therein. The axial cross-section of the block 30 is I-shaped, one end is fixed to the output end, and the other end is movably arranged in the inner cavity 32, that is, the other end of the block 30 can move in any direction in the inner cavity 32, and a first elastic member is provided between the other end of the block 30 and the wall of the inner cavity 32, wherein the first elastic member includes a plurality of springs provided around the block 30, and a spring arranged in the axial direction, so that the other end of the block 30 is equivalent to floating in the inner cavity 32, In this way, during the connection between the calibration rod 23 and the calibration groove 21, the mounting seat 31 and the block 30 can be found to move relative to each other. Compared with forcing the driving mechanism to return to the position where mechanical wear occurs and the initial position without wear, the elastic force of the first elastic member can be reduced, so that the friction between the calibration rod 23 and the calibration groove 21 will also be reduced accordingly. Among them, when the calibration rod 23 needs to be connected with the rear section 211 of the calibration groove 21, the driving mechanism can drive the block 30 to move basically in the axial direction, and when the block 30 and the axial bottom of the inner cavity 32 are abutted (along the direction of clamping the beam), the mounting frame 11 as a whole can be driven to gradually approach the beam, and the calibration rod 23 and the rear section 211 will also be gradually connected until the upper clamping block 12 and the lower clamping block 13 clamp the beam.

[0038] Furthermore, a centering mechanism 4 is provided on the upper base 20. When the positions of the corresponding upper clamping block 12 and the lower clamping block 13 are calibrated and approach each other, the centering mechanism 4 drives the position of the block 30 to be centered with the position of the mounting seat 31.

[0039] Specifically, in the aforementioned embodiment, the position adaptation mechanism 3 is used to reduce the wear during the insertion process between the calibration rod 23 and the calibration groove 21, but the driving mechanism is still in the wear position, and the direction of the force applied to the upper clamping block 12 through the mounting frame 11 is offset, which will make it difficult for the clamping force directions of the upper clamping block 12 and the lower clamping block 13 to correspond to each other, and the degree of wear will also increase if the driving mechanism continues to work in the wear position.

[0040] Therefore, in this embodiment, by providing a centering mechanism 4, during the process of plugging the calibration rod 23 and the rear section 211, the driving mechanism is forced to return from the worn position to the initial unworn position to solve the above problem. That is, in an optional embodiment, the centering mechanism 4 is provided at a position close to the position corresponding to the mechanism 3. The centering mechanism 4 includes two swinging rods 40 symmetrically arranged on the upper clamping block 12. The ends of the two swinging rods 40 away from the upper clamping block 12 are both equipped with extrusion blocks 41. Based on the extrusion effect of the calibration rod 23, the two swinging rods 40 drive the two extrusion blocks 41 to jointly extrude the block body 30. That is, during the process of the upper clamping block 12 and the lower clamping block 13 continuing to approach each other, as the insertion depth of the calibration rod 23 in the rear section 211 gradually increases. The front end of the calibration rod 23 will produce an extrusion effect on the two ends of the two swing rods 40 away from the extrusion block 41, so that the two ends are away from each other, and the other two ends of the two swing rods 40 will drive the two extrusion blocks 41 to approach each other, and produce an extrusion effect in a relative direction along a certain radial direction of the block 30, so that the center of the block 30 and the center of the mounting seat 31 can be basically aligned along the axial direction. This does not avoid hindering the relative movement of the mounting seat 31 and the block 30 when the calibration rod 23 and the front section 210 of the calibration groove 21 are squeezed against each other. The swing axis position of the preferred swing rod 40 is close to the end squeezed by the calibration rod 23, so that a stroke amplification effect can be formed, making room for the relative movement of the mounting seat 31 and the block 30.

[0041] Preferably, the extrusion block 41 is provided with an extrusion opening with a V-shaped structure, and the angle of the extrusion opening is an obtuse angle; specifically, the extrusion opening with a V-shaped structure is provided on the extrusion block 41, which can produce an extrusion effect in the circumferential direction of the block 30, so that the center of the block 30 and the center of the mounting seat 31 are better aligned.

[0042] In a second embodiment of the present invention, a cylindrical body 15 is provided on the surface of the upper clamping block 12 and the lower clamping block 13 for clamping the automobile frame cross beam. A plurality of abutment rods 16 are provided on the cylindrical body 15 for sliding along the axial direction. In the sliding direction, a second elastic member is provided between the abutment rod 16 and the cylindrical body 15. Based on the elastic force of the second elastic member, the abutment rod 16 tends to extend out of the cylindrical body 15. A limiting mechanism is also provided on the cylindrical body 15. After clamping the automobile frame cross beam, the limiting mechanism limits the movement of each abutment rod 16.

[0043] Specifically, since the surface of the beam is not completely flat, when clamping it, it is necessary to adapt to the changes in its surface structure in order to ensure the clamping effect. Therefore, in this embodiment, components that can adapt to changes in the surface structure of the beam are installed on the upper clamping block 12 and the lower clamping block 13, that is, the several abutment rods 16 slidingly arranged on the cylinder 15 can undergo different position changes on the cylinder 15 when subjected to different extrusion effects, that is, when clamping the beam, due to changes in the surface structure of the beam, the position of each abutment rod 16 on the cylinder 15 changes differently. The elastic force of the second elastic member is used to first form a flexible clamp. When the upper clamping block 12 can no longer approach the lower clamping block 13, the limit mechanism is used to limit the position of each abutment rod 16. In this way, the purpose of adaptive clamping according to changes in the surface structure of the beam can be achieved.

[0044] Preferably, the end of the abutment rod 16 for abutting the automobile frame crossbeam is installed with a rubber pad 160 by means of a spherical hinge, and a third elastic member is provided between the rubber pad 160 and the abutment rod 16; specifically, the swinging rubber pad 160 is more easily adapted to changes in the surface structure of the crossbeam, providing stable support for the clamping of the crossbeam, and the elastic force of the third elastic member tends to make the axial direction of the rubber pad 160 parallel to the axial direction of the abutment rod 16.

[0045] Furthermore, the limit mechanism includes a plurality of limit sockets 17 arranged axially on each abutment rod 16 and a limit plate 18 arranged to slide vertically on the cylinder 15. The limit plate 18 is provided with a plurality of limit inserts 19 of the same number as the plurality of abutment rods 16. After the position of the abutment rod 16 changes, the limit inserts 19 can be plugged into the corresponding limit sockets 17 at that time to limit the position of the abutment rod 16. The calibration rod 23 is divided into an outer layer 230 and an inner layer 231. The inner layer 231 is arranged to slide axially on the outer layer 230, and a third elastic member is provided between the two in the sliding direction. A transmission mechanism 5 is arranged on the upper base 20 and the lower base 22. That is, after the mounting seat 31 is aligned with the center axis of the block 30, the calibration rod 23 will continue to penetrate into the rear section 211. In the subsequent stroke, the outer layer 230 transmits power to the limit plate 18 corresponding to the upper clamping block 12 through the transmission mechanism 5 located on the upper base 20. , so that it drives the limiting insert 19 to plug into the corresponding limiting socket 17 at this time, and then the rear section 211 prevents the calibration rod 23 from continuing to penetrate, and the inner layer 231 is squeezed into the outer layer 230, and the inner layer 231 transmits power to the limiting plate 18 of the corresponding lower clamping block 13 through the transmission mechanism 5 on the lower base 22, so that it drives the limiting insert 19 to plug into the corresponding limiting socket 17 at this time, so that the position of all the abutment rods 16 on the upper clamping block 12 and the lower clamping block 13 can be restricted, thereby clamping the crossbeam, wherein the end of the limiting socket 17 close to the central axis of the abutment rod 16 is farther away from the rubber pad 160 than the other end. During the plugging stroke of the limiting insert 19 and the corresponding limiting socket 17, the abutment rod 16 drives the rubber pad 160 to further approach the surface of the automobile vehicle crossbeam, that is, the rubber pad 160 is squeezed and elastically deformed, and after adapting to the changes in the surface structure of the crossbeam, its rebound is reduced, thereby ensuring the stability of the crossbeam welding process.

[0046] The transmission mechanism 5 is used to realize the power transmission between the transmission calibration rod 23 and the corresponding limit plate 18. Due to the change of the beam structure, the layout positions of the upper clamping block 12 and the lower clamping block 13 also need to be adjusted accordingly. The specific structure and layout of the transmission mechanism 5 can be arranged according to actual needs. This is the existing technology and will not be elaborated in detail.

[0047] A third embodiment of the present invention further relates to a method for using a support fixture for welding a cross member of an automobile frame. The method for supporting and clamping an automobile frame during welding using the above-mentioned support fixture for welding a cross member of an automobile frame comprises the following steps:

[0048] Step 1: Preliminary positioning: Place the automobile frame crossbeam on the workbench 1, and pre-plug the positioning pins 14 on the workbench 1 into the positioning holes on the crossbeam;

[0049] Step 2: Position calibration and positioning: The driving mechanism drives the upper clamping block 12 to approach the lower clamping block 13. The position calibration mechanism first completes the position calibration of the upper clamping block 12 and the lower clamping block 13. After the position calibration, the upper clamping block 12 and the lower clamping block 13 continue to approach each other, and the positioning pins 14 on the mounting frame 11 are plugged into the positioning holes on the beam to complete the re-positioning of the beam.

[0050] Step 3: Clamping and welding: the upper clamping block 12 and the lower clamping block 13 clamp the crossbeam, and the welding equipment starts to weld the crossbeam.

[0051] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A welding support fixture for automobile frame crossbeams, comprising a welding workbench and a plurality of drive mechanisms disposed on the workbench, wherein the power output end of each drive mechanism is mounted with an upper clamping block via a mounting frame, and a plurality of lower clamping blocks are mounted on the workbench, wherein the plurality of upper clamping blocks correspond to the plurality of lower clamping blocks in a one-to-one manner, and wherein: Also includes: A passive position calibration mechanism includes an upper base provided on each upper clamping block and a lower base provided on each lower clamping block, wherein a calibration groove is provided on the upper base and a calibration rod is installed on the lower base; During the insertion stroke of the calibration rod and the calibration groove, the calibration groove drives the corresponding upper clamping block to align with the lower clamping block based on the squeezing effect of the calibration rod.

2. The automobile frame crossbeam welding support fixture according to claim 1, characterized in that: Positioning pins are arranged on the mounting frame and the workbench, and the positioning pins are used to be plugged into the positioning holes on the beam.

3. The automobile frame cross member welding support fixture according to claim 1, characterized in that: It also includes a position adaptation mechanism, which includes a block installed at the power output end of the driving mechanism and a mounting seat with an inner cavity arranged on the mounting frame. The block is movably arranged in the mounting seat, and a first elastic member is provided between the two. When the calibration groove is squeezed by the calibration rod, the mounting seat and the block move relative to each other.

4. The automobile frame crossbeam welding support fixture according to claim 3, characterized in that: The upper base is provided with a centering mechanism, and when the positions of the corresponding upper clamping block and the lower clamping block are calibrated and approach each other, the centering mechanism drives the block position to be centered with the mounting seat position.

5. The automobile frame cross member welding support fixture according to claim 4, characterized in that: The centering mechanism includes two swing rods symmetrically arranged on the upper clamping block. The ends of the two swing rods away from the upper clamping block are both equipped with extrusion blocks. Based on the extrusion effect of the calibration rod, the two swing rods drive the two extrusion blocks to jointly extrude the block body.

6. The automobile frame cross member welding support fixture according to claim 5, characterized in that: The swing axis of the swing lever is located close to the end squeezed by the calibration rod.

7. The automobile frame cross member welding support fixture according to claim 5, characterized in that: The extrusion block is provided with an extrusion opening of a V-shaped structure, and the included angle of the extrusion opening is an obtuse angle.

8. The automobile frame cross member welding support fixture according to claim 1, characterized in that: The upper clamping block and the lower clamping block are both provided with a cylinder on the surface for clamping the automobile frame cross beam. A plurality of abutment rods are provided on the cylinder for sliding along the axial direction. In the sliding direction, a second elastic member is provided between the abutment rod and the cylinder. Based on the elastic force of the second elastic member, the abutment rod has a tendency to extend out of the cylinder. A limiting mechanism is also provided on the cylinder. After clamping the automobile frame cross beam, the limiting mechanism limits the movement of each abutment rod.

9. The automobile frame cross member welding support fixture according to claim 8, characterized in that: The end of the abutting rod used for abutting against the automobile frame crossbeam is installed with a rubber pad in a spherical hinge manner, and a third elastic member is provided between the rubber pad and the abutting rod.

10. A method for using a welding support fixture for an automobile frame cross member, which is based on the welding support fixture for an automobile frame cross member according to any one of claims 1 to 9, characterized in that: Method for using the automobile frame crossbeam welding support fixture The following steps are involved: Initial positioning: Place the automobile frame crossbeam on the workbench, and pre-plug the positioning pins on the workbench into the positioning holes on the crossbeam; Position calibration and positioning: the driving mechanism drives the upper clamping block to approach the lower clamping block. The position calibration mechanism first completes the position calibration of the upper clamping block and the lower clamping block. When the upper clamping block and the lower clamping block continue to approach after the position calibration, the positioning pins on the mounting frame are plugged into the positioning holes on the beam to complete the re-positioning of the beam. Clamping and welding, the upper clamp and the lower clamp clamp the beam, and the welding equipment starts welding the beam.

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