Automobile frame component welding positioning method and support clamp

Abstract

The present application relates to the technical field of automobile frame welding, and particularly relates to a method for welding and positioning automobile frame parts and a supporting clamp, which comprises a positioning supporting base, left and right sides of the top of the positioning supporting base are fixedly connected with motors, the left side of the motor is fixedly connected with a mounting table, and the inner side of the mounting table is fixedly connected with a processing platform; the welding deformation compensation mechanism is arranged, adaptive pre-compensation and real-time dynamic compensation of welding angle deformation are realized, the clamp compensation mechanism is arranged, synchronous follow-up of clamping posture and workpiece angle change is realized, the clamp reinforcing mechanism is arranged, clamping force is reinforced, when the positioning rod further slides under the driving of welding thermal expansion, the lower sealing plate is driven to slide synchronously in the positioning cylinder, the positioning groove is arranged, while ensuring the sliding guiding precision of the positioning toothed plate, the positioning groove provides a ventilation and pressure relief channel for the sealing cavity, and the risk of damage of parts caused by excessively high air pressure is effectively avoided.

Description

Technical Field

[0001] This invention relates to the technical field of automotive frame welding, and more particularly to a welding positioning method and support fixture for automotive frame components. Background Technology

[0002] In the automotive manufacturing industry, the chassis is a key structural component that supports the vehicle body and connects various core components. Its welding quality directly affects the safety, durability, and handling stability of the entire vehicle. The chassis is usually made up of longitudinal beams, cross beams, and various reinforcing plates connected by welding. The heat input generated during the welding process can cause complex thermal deformation of the workpiece. If the positioning and clamping fixtures cannot effectively cope with such deformation, it will directly lead to the chassis dimensional accuracy exceeding the tolerance, affecting subsequent assembly and the performance of the entire vehicle.

[0003] Patent publication number CN121018001B discloses a positioning and clamping fixture for welding automotive frames, with main classification number B23K37. This fixture relates to the field of automotive manufacturing equipment technology and includes a worktable. A welding angle adjustment mechanism is located on the top of the worktable, and a dynamic compensation positioning and clamping mechanism for thermal deformation is located on top of the welding angle adjustment mechanism. A PLC controller is mounted on the top of the worktable. This positioning and clamping fixture for welding automotive frames, through its dynamic compensation positioning and clamping mechanism for thermal deformation, corrects positional deviations caused by thermal deformation in real time, preventing dimensional inaccuracies in the welded parts of the frame from exceeding tolerances. This reduces subsequent straightening processing steps, lowers production costs, and solves the problem of existing fixtures using fixed rigid clamping and positioning structures that cannot correct positional deviations caused by thermal deformation in real time, resulting in dimensional inaccuracies in the welded parts of the frame and requiring additional straightening processing during subsequent assembly, thus increasing production costs.

[0004] Traditional vehicle frame welding fixtures mostly adopt a rigid fixed structure, that is, the workpiece is initially positioned by a locating pin, and then the workpiece is rigidly pressed onto the locating surface by a cylinder-driven pressure plate or clamping block. This type of fixture is simple in structure and low in cost, but it has significant technical defects: the clamping posture of the fixture is fixed. When the workpiece deflects due to thermal deformation, the clamping surface of the fixed-posture fixture is no longer perpendicular to the workpiece surface. The clamping force will generate a tangential component, which not only reduces the clamping stability, but may also cause the workpiece to slip along the inclined surface during welding vibration, further aggravating dimensional deviations. Traditional vehicle frame welding fixtures, whether rigid fixed structures or electronically controlled active compensation structures, cannot simultaneously solve the three core problems of real-time compensation of angular deformation, synchronous follow-up of clamping posture, and adaptive enhancement of clamping force. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the current automotive frame component welding support fixture, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a welding support fixture for automotive frame components, which aims to compensate for welding deformation and to provide an adaptive dynamic fixture.

[0008] To solve the above technical problems, the present invention provides the following technical solution: a positioning adjustment mechanism, which includes a positioning support base, a motor fixedly connected to the left and right sides of the top of the positioning support base, a mounting platform fixedly connected to the left side of the motor, a processing platform fixedly connected to the inner side of the mounting platform, a mounting groove fixedly connected to the front and back ends of the top of the processing platform, and a positioning plate slidably connected to the top of the mounting groove.

[0009] A welding deformation compensation mechanism is installed on the top of the processing platform. The welding deformation compensation mechanism can adaptively adjust the initial angle of the workpiece welding according to the welding angle deformation of the workpiece and the thickness of the workpiece itself, and can dynamically compensate the initial angle during the welding process to offset the influence of welding angle deformation on the workpiece accuracy.

[0010] A clamping compensation mechanism is provided on the welding deformation compensation mechanism. The clamping compensation mechanism can synchronously adjust the angle of the clamp according to the initial angle of the workpiece welding, so that the direction of the clamping surface and the clamping position are synchronized with the initial angle of the workpiece welding, so that the clamping fixture fits tightly against the workpiece, and further fixes the workpiece.

[0011] A clamping reinforcement mechanism is provided inside the welding deformation compensation mechanism. The clamping reinforcement mechanism can be driven by the welding deformation compensation mechanism to make the clamp firmly hold the welding plate during operation, avoid positional deviation caused by shaking and wobbling, and further enhance the clamping force.

[0012] As a preferred embodiment of the welding support fixture for automotive frame components according to the present invention, the welding deformation compensation mechanism includes a compensation plate movable rod, wherein two sets of compensation plate movable rods are provided, with two rods in each set. The bottom of the compensation plate movable rod is fixedly connected to the top of the processing platform. A welding deflection compensation plate is movably connected to the inner side of the compensation plate movable rod via a rotating shaft. A positioning cylinder is fixedly connected to the top of the positioning plate. A positioning rod is slidably connected to the right side of the inner wall of the positioning cylinder. Limiting components are slidably connected to the front and back ends of the positioning rod. The front end of the limiting component is fixedly connected to the front end of the inner wall of the positioning cylinder. The left side of the positioning rod is slidably connected to the left side of the inner wall of the positioning cylinder. A positioning toothed plate is fixedly connected to the left side of the positioning rod. The front end of the positioning cylinder... Both the back end and the upper end are fixedly connected to a gear rod. The inner side of the gear rod and the left side of the corresponding positioning tooth plate are movably connected to a positioning gear via a rotating shaft. The top of the positioning plate and the left side of the corresponding positioning cylinder are fixedly connected to a hollow rod sleeve. The inner cavity of the hollow rod sleeve is movably connected to a deformation compensation rod. The right side of the deformation compensation rod passes through the right side of the hollow rod sleeve and is fixedly connected to a compensation tooth plate. The left and right sides of the positioning gear are meshed with the right side of the compensation tooth plate and the left side of the positioning tooth plate. The bottom of the deformation compensation rod is fixedly connected to an L-shaped welded compensation connecting rod. The left side of the L-shaped welded compensation connecting rod passes through the left side of the hollow rod sleeve. The end of the L-shaped welded compensation connecting rod away from the deformation compensation rod is movably connected to the bottom of the welding angle compensation plate via a shaft.

[0013] As a preferred embodiment of the welding support fixture for automotive frame components according to the present invention, the fixture compensation mechanism includes a cylinder fixing rod and a fixture fixing plate. The cylinder fixing rod is fixed to the right side of the positioning rod. A lifting and starting cylinder is fixedly connected to the bottom of the cylinder fixing rod. The bottom left side of the lifting and starting cylinder is fixedly connected to the right side of the positioning cylinder. The fixture fixing plate is fixed to the top of the positioning rod. A synchronous shaft is movably connected to the back end of the bottom of the fixture fixing plate via a rotating shaft. Compensation fixtures are fixedly connected to the left and right sides of the synchronous shaft. A synchronous lower pressure plate is fixedly connected to the bottom of the inner side of the compensation fixture. A fixture adjusting gear plate is fixedly connected to the left side of the positioning rod. A fixture adjusting gear is movably connected to the bottom of the fixture fixing plate via a rotating shaft. The front end of the fixture adjusting gear meshes with the back end of the fixture adjusting gear plate. A synchronous adjusting shaft block is fixedly connected to the left side of the fixture adjusting gear. The synchronous adjusting shaft block and the synchronous shaft are connected by a transmission belt.

[0014] As a preferred embodiment of the welding support fixture for automotive frame components according to the present invention, the fixture reinforcement mechanism includes an upper sealing plate and a lower sealing plate. The surface of the upper sealing plate is fixedly connected to the inner wall of the positioning cylinder, the left side of the upper sealing plate is fixedly connected to the right side of the limiting member, the front end of the upper sealing plate is slidably connected to the back end of the positioning rod, the surface of the lower sealing plate is slidably connected to the inner wall of the positioning cylinder, the left side of the lower sealing plate is slidably connected to the right side of the limiting member, the front end of the lower sealing plate is fixedly connected to the back end of the positioning rod, an air pipe is fixedly connected to the top of the upper sealing plate, the end of the air pipe away from the upper sealing plate is fixedly connected to the front end of the compensation fixture, an air chamber is opened in the inner cavity of the compensation fixture, the front opening of the air chamber is connected to the back end of the air pipe, and the bottom opening of the air chamber is located at the bottom of the compensation fixture.

[0015] As a preferred embodiment of the automotive frame component welding support fixture of the present invention, a positioning groove is provided on the left side of the positioning cylinder and at the position corresponding to the positioning tooth plate, and the front end and back end of the positioning tooth plate are slidably connected to the front end and back end of the inner wall of the positioning groove.

[0016] In a preferred embodiment of the automotive frame component welding support fixture of the present invention, a clamping spring is fixedly connected to the bottom of the positioning rod, and the bottom of the clamping spring is fixedly connected to the top of the positioning plate.

[0017] As a preferred embodiment of the automotive frame component welding support fixture of the present invention, a compensation rod groove is provided on the left side of the hollow rod sleeve and at the position corresponding to the L-shaped welding compensation connecting rod, and the compensation rod groove slides in conjunction with the L-shaped welding compensation connecting rod.

[0018] As a preferred embodiment of the welding support fixture for automotive frame components described in this invention, the top of the fixture adjusting toothed plate extends through the top of the fixture fixing plate, and a fixture toothed plate groove is provided in the inner cavity of the fixture fixing plate at a position corresponding to the position of the fixture adjusting toothed plate.

[0019] In view of the problems existing in the current method for welding and positioning automotive frame components, the present invention is proposed.

[0020] Therefore, the purpose of this invention is to provide a welding positioning method for automotive frame components, the purpose of which is to adjust the pre-input angle according to the thickness, compensate for fixture deformation, and enhance air pressure clamping.

[0021] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including driving the mounting table and processing platform to rotate and adjust by driving the motor through the positioning adjustment mechanism, lifting the positioning rod and the compensation fixture above by the lifting start cylinder, and placing the workpiece to be welded on the welding angle compensation plate;

[0022] Based on the workpiece's own thickness, when the compensating fixture is pressed down by the fixture spring, it pushes the positioning rod to slide inside the positioning cylinder. The positioning rod drives the positioning tooth plate to move and, through the positioning gear, drives the compensating tooth plate. The compensating tooth plate drives the deformation compensating rod and the L-shaped welding compensating connecting rod to move. The L-shaped welding compensating connecting rod drives the welding angle compensating plate to rotate around the compensating plate movable rod. The initial welding angle of the workpiece is adaptively adjusted according to the workpiece thickness to reserve a welding angle deformation compensation allowance.

[0023] During pre-adjustment, the movement of the positioning rod drives the clamp adjustment gear to rotate through the clamp adjustment tooth plate. The clamp adjustment gear drives the synchronous shaft to rotate through the synchronous adjustment shaft block and the transmission belt, so that the compensation clamp deflects synchronously with the initial welding angle. The clamping surface direction and the clamping position are in contact with the workpiece surface to fix the workpiece.

[0024] During the welding process, the workpiece undergoes angular deformation due to heat. The positioning rod slides further as the welding heat expands, continuously driving the welding deformation compensation mechanism to dynamically adjust the angle of the welding angle compensation plate, compensating for welding angular deformation in real time. At the same time, the compensation fixture above is adjusted in real time for further fixation.

[0025] The sliding of the positioning rod causes the lower sealing plate to slide inside the positioning cylinder, compressing the volume of the sealing cavity between the upper and lower sealing plates. This generates negative pressure suction, which is transmitted through the air pipe to the air chamber of the compensating fixture. The negative pressure suction acts on the bottom opening of the air chamber, enabling the compensating fixture to generate an auxiliary and enhanced clamping force on the workpiece, preventing vibration and shaking during the welding process from affecting the clamping.

[0026] As a preferred embodiment of the welding positioning method for automotive frame components described in this invention, the following is included: during welding pre-adjustment, the thinner the workpiece, the smaller the sliding displacement of the positioning rod in the positioning cylinder, the smaller the movement of the positioning toothed plate driven by the positioning gear, and the smaller the deflection angle of the welding angle compensation plate driven by the L-shaped welding compensation connecting rod, so that the thin plate workpiece obtains a smaller initial tilt angle to match the smaller welding angle deformation during thin plate welding.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. This invention achieves adaptive pre-compensation and real-time dynamic compensation for welding angular deformation by setting up a welding deformation compensation mechanism. The positioning rod slides by adjusting the thickness of the workpiece itself. Through the linkage of the positioning tooth plate, positioning gear and compensation tooth plate, the welding angular compensation plate is driven to generate an initial tilt angle that matches the thickness of the workpiece. The thinner the workpiece, the smaller the initial tilt angle. At the same time, during the welding process, the angular deformation caused by the thermal expansion of the workpiece will continue to push the positioning rod to slide further, so that the angle of the welding angular compensation plate is dynamically adjusted in real time with the change of thermal deformation. This effectively solves the problems of cracking of thick plate welds and bulging of thin plate welds caused by the complete constraint of traditional rigid fixtures, and significantly improves the dimensional accuracy and appearance quality of the welded frame components.

[0029] 2. This invention, by setting a clamping compensation mechanism, achieves synchronous follow-up of clamping posture and workpiece angle changes. When the positioning rod slides, the clamping adjustment tooth plate synchronously drives the clamping adjustment gear to rotate, which in turn drives the synchronous shaft to rotate via the synchronous adjustment shaft block and transmission belt. This causes the compensation clamp to deflect synchronously with the initial angle change of the welding angle compensation plate. During the welding process, when the welding deformation compensation mechanism dynamically adjusts the angle, the clamping compensation mechanism also responds accordingly, ensuring that the clamping surface direction of the compensation clamp always acts on the workpiece surface and the clamping position always conforms to the actual posture of the workpiece. This avoids the clamping surface offset or local clamping failure problems caused by changes in the workpiece angle of traditional clamps, and ensures the reliability and stability of clamping throughout the welding process.

[0030] 3. This invention enhances the clamping force by setting up a clamping reinforcement mechanism. When the positioning rod slides further under the drive of welding thermal expansion, it drives the lower sealing plate to slide synchronously in the positioning cylinder, compressing the sealing cavity between the upper and lower sealing plates. The generated air pressure is transmitted to the air chamber of the compensating clamp through the air pipe. The air pressure acts on the bottom opening of the air chamber, so that the compensating clamp generates an additional auxiliary clamping force on the workpiece. The pneumatic locking force effectively suppresses the position deviation caused by welding vibration and shaking, significantly improves the anti-interference ability of the welding process, and further improves the clamping and fixing effect.

[0031] 4. This invention, by setting a positioning groove, ensures the sliding guidance accuracy of the positioning toothed plate while providing a ventilation and pressure relief channel for the sealed cavity. This effectively avoids the risk of damage to components due to excessive air pressure. The inner walls of the front and back ends of the positioning groove slide in cooperation with the positioning toothed plate, ensuring that the positioning toothed plate only makes linear reciprocating movements in a preset direction, avoiding swaying or jamming, thereby ensuring the accuracy and reliability of thickness sensing signal transmission. At the same time, inside the positioning cylinder, i.e., the cavity between the upper and lower sealing plates, and the chamber formed by the positioning cylinder and the positioning rod, when the positioning rod slides and compresses the sealed cavity to generate suction, the compensating clamp forms a reinforced clamp, and the gas in the chamber can be naturally discharged through the gap of the positioning groove, avoiding the formation of excessive air pressure at the bottom of the chamber due to complete sealing. This prevents the upper sealing plate, lower sealing plate, or positioning cylinder from deforming or bursting due to continuous increase in air pressure in the sealed cavity, effectively protecting the service life of the components, and avoiding interference with the reset accuracy of the clamp spring due to excessive air pressure. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0034] Figure 2 This is a three-dimensional structural diagram of the welding angle compensation plate provided by the present invention.

[0035] Figure 3 This is a three-dimensional structural diagram of the clamp fixing plate provided by the present invention.

[0036] Figure 4 A three-dimensional structural diagram of the positioning gear provided by the present invention.

[0037] Figure 5 This is a three-dimensional structural diagram of the synchronous adjustment shaft block provided by the present invention.

[0038] Figure 6 This is a three-dimensional structural diagram of the limiting member provided by the present invention.

[0039] Figure 7 A three-dimensional structural diagram of the synchronous shaft provided by the present invention.

[0040] Figure 8 This is an enlarged schematic diagram of point A provided by the present invention.

[0041] Figure 9This is a three-dimensional structural diagram of the compensation fixture provided by the present invention.

[0042] Figure label:

[0043] 100. Positioning adjustment mechanism; 101. Positioning support base; 102. Motor; 103. Mounting platform; 104. Machining platform; 105. Mounting slide rail; 106. Positioning plate; 200. Welding deformation compensation mechanism; 201. Compensation plate movable rod; 202. Welding deflection compensation plate; 203. Positioning cylinder; 203-1. Positioning groove; 204. Positioning rod; 204-1. Clamping spring; 205. Limiting component; 206. Positioning toothed plate; 207. Gear rod; 208. Positioning gear; 209. Hollow rod sleeve; 209-1. Compensation rod slide rail; 210. Deformation compensation rod; 2 11. Compensating toothed plate; 212. L-shaped welded compensating connecting rod; 300. Fixture compensation mechanism; 301. Cylinder fixing rod; 301-1. Lifting and starting cylinder; 302. Fixture fixing plate; 302-1. Synchronous shaft rod; 302-2. Compensating fixture; 302-3. Synchronous lower pressure plate inside the fixture; 302-4. Fixture adjusting toothed plate; 302-4-1. Fixture toothed plate groove; 302-5. Fixture adjusting gear; 302-6. Synchronous adjusting shaft block; 400. Fixture reinforcing mechanism; 401. Upper sealing plate; 401-1. Air pipe; 401-2. Air chamber; 402. Lower sealing plate. Detailed Implementation

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0046] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0047] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0048] Example 1

[0049] The positioning adjustment mechanism 100 includes a positioning support base 101. A motor 102 is fixedly connected to the left and right sides of the top of the positioning support base 101. A mounting platform 103 is fixedly connected to the left side of the motor 102. A processing platform 104 is fixedly connected to the inner side of the mounting platform 103. A mounting groove 105 is fixedly connected to the front and back ends of the top of the processing platform 104. A positioning plate 106 is slidably connected to the top of the mounting groove 105.

[0050] One embodiment of this example is as follows: The welding deformation compensation mechanism 200 includes a compensation plate movable rod 201. Two sets of compensation plate movable rods 201 are provided, with two rods in each set. The bottom of the compensation plate movable rod 201 is fixedly connected to the top of the processing platform 104. A welding deflection compensation plate 202 is movably connected to the inner side of the compensation plate movable rod 201 via a rotating shaft. A positioning cylinder 203 is fixedly connected to the top of the positioning plate 106. A positioning rod 204 is slidably connected to the right side of the inner wall of the positioning cylinder 203. Limiting elements 205 are slidably connected to both the front and back ends of the positioning rod 204. The front end of the limiting element 205 is fixedly connected to the front end of the inner wall of the positioning cylinder 203. The left side of the positioning rod 204 is slidably connected to the left side of the inner wall of the positioning cylinder 203. A positioning toothed plate 206 is fixedly connected to the left side of the positioning rod 204. A gear rod 20 is fixedly connected to both the front and back ends of the positioning cylinder 203. 7. A positioning gear 208 is movably connected to the inner side of the gear rod 207 and the left side of the positioning tooth plate 206 via a rotating shaft. A hollow rod sleeve 209 is fixedly connected to the top of the positioning plate 106 and the left side of the positioning cylinder 203. A deformation compensation rod 210 is movably connected to the inner cavity of the hollow rod sleeve 209. A compensation tooth plate 211 is fixedly connected to the right side of the deformation compensation rod 210 through the right side of the hollow rod sleeve 209. The left and right sides of the positioning gear 208 are meshed with the right side of the compensation tooth plate 211 and the left side of the positioning tooth plate 206. An L-shaped welded compensation connecting rod 212 is fixedly connected to the bottom of the deformation compensation rod 210. The left side of the L-shaped welded compensation connecting rod 212 passes through the left side of the hollow rod sleeve 209. The end of the L-shaped welded compensation connecting rod 212 away from the deformation compensation rod 210 is movably connected to the bottom of the welding angle compensation plate 202 via a shaft.

[0051] A clamping spring 204-1 is fixedly connected to the bottom of the positioning rod 204, and the bottom of the clamping spring 204-1 is fixedly connected to the top of the positioning plate 106.

[0052] A compensating rod groove 209-1 is provided on the left side of the hollow rod sleeve 209 and at the position corresponding to the L-shaped welded compensating connecting rod 212. The compensating rod groove 209-1 slides in conjunction with the L-shaped welded compensating connecting rod 212.

[0053] Two sets of limiting members 205 are fixedly installed on the front and rear side walls inside the positioning cylinder 203, respectively. Each set of limiting members 205 consists of two members, which are arranged at intervals in the horizontal direction. The interval between the two limiting members 205 constitutes the sliding limit of the positioning rod 204. Limiting grooves are respectively provided on the front and rear side walls of the positioning rod 204. The inner ends of the limiting members 205 slide and engage in the corresponding limiting grooves. The top end of the clamping spring 204-1 is fixedly connected to the spring lug at the bottom of the positioning rod 204. The bottom end of the clamping spring 204-1 is fixedly connected to the spring positioning groove opened at the corresponding position on the top of the positioning plate 106. When the positioning rod 204 is slid by the cylinder fixing rod 301, the clamping spring 204-1 stores elastic potential energy. When the external pressure generated by the cylinder fixing rod 301 is released, the clamping spring 204-1 resets and releases elastic potential energy, pushing the positioning rod 204 to slide down and reset, so as to ensure that the positioning rod 204 can produce a displacement proportional to the thickness of the workpiece with different thicknesses.

[0054] The positioning toothed plate 206 is a rack and pinion structure extending vertically. The right side wall of the positioning toothed plate 206 is fixedly connected to the left side wall of the positioning rod 204 by welding or bolts. The left side wall of the positioning toothed plate 206 is provided with meshing teeth arranged vertically. The left side wall of the positioning cylinder 203 is provided with a positioning groove 203-1 corresponding to the position of the positioning toothed plate 206. The positioning toothed plate 206 passes through the positioning groove 203-1 and extends to the outside of the positioning cylinder 203. The front inner wall and the rear inner wall of the positioning groove 203-1 are slidably fitted with the front and rear inner walls of the positioning toothed plate 206, respectively. There are two sets of gear rods 207, which are fixedly connected to the outside of the front and rear side walls of the positioning cylinder 203, respectively. Each set of gear rods 207 consists of two gears, which are arranged at intervals along the vertical direction. The positioning gear 208 passes through this... The gear shaft is rotatably positioned between two gear rods 207. The positioning gear 208 is located on the left side of the positioning tooth plate 206 and meshes with the meshing teeth on the left side wall of the positioning tooth plate 206. The hollow rod sleeve 209 is a hollow cylindrical structure, which is fixedly set on the top of the positioning plate 106 and located on the left side of the positioning cylinder 203. The inner cavity of the hollow rod sleeve 209 is a sliding chamber. The deformation compensation rod 210 slides through the sliding chamber. The right end of the deformation compensation rod 210 penetrates the right side wall of the hollow rod sleeve 209. The compensation tooth plate 211 is fixedly connected to the right side of the deformation compensation rod 210. The compensation tooth plate 211 is a rack plate structure extending vertically. Its right side wall is provided with meshing teeth arranged vertically. The right meshing teeth of the compensation tooth plate 211 mesh with the left side of the positioning gear 208.

[0055] The bottom of the left side wall of the hollow rod sleeve 209 is provided with a compensating rod groove 209-1. The compensating rod groove 209-1 is a long strip-shaped through groove extending in the left rear direction. One end of the L-shaped welded compensating connecting rod 212 is fixedly connected to the bottom side wall of the deformable compensating rod 210. The other end of the L-shaped welded compensating connecting rod 212 passes through the compensating rod groove 209-1 and extends to the outside of the hollow rod sleeve 209, and is movably connected to the bottom side wall of the welded angle compensation plate 202. The welded angle compensation plate 202 is a flat plate structure. Its bottom front and rear sides are rotatably connected to the inner ends of two sets of compensating plate movable rods 201 via rotating shafts. The bottom of the compensating plate movable rod 201 is fixedly connected to the top of the processing platform 104. The top plane of the welding angle compensating plate 202 is the workpiece placement support surface. When the L-shaped welding compensation connecting rod 212 slides, it drives the welding angle compensating plate 202 to rotate around the rotating shaft at the top of the compensating plate movable rod 201 as the fulcrum. The welding angle compensating plate 202 deflects, thereby adjusting the initial support angle of the workpiece.

[0056] In the initial state, the clamp spring 204-1 is in its natural state, keeping the positioning rod 204 at its lowest position. After the workpiece is placed on the welding angle compensation plate 202, the positioning rod 204 slides downward, and the compensation clamp 302-2 presses down on the workpiece through the clamp spring 204-1, causing the positioning tooth plate 206 to move downward synchronously. The positioning tooth plate 206 drives the positioning gear 208 to rotate clockwise through meshing. The positioning gear 208 then drives the compensation tooth plate 211 to move upward through meshing. When the compensation tooth plate 211 moves, it causes the deformation compensation rod 210 to slide upward within the hollow rod sleeve 209. The L-shaped welding compensation connecting rod 212 moves synchronously and pulls the welding angle compensation plate 202 to rotate around the pivot at the top of the compensation plate movable rod 201 to form the initial tilt angle.

[0057] The thinner the workpiece, the smaller the displacement of the positioning rod 204, the smaller the movement of the positioning tooth plate 206, the smaller the rotation angle of the positioning gear 208, the smaller the movement of the compensation tooth plate 211, the smaller the sliding amount of the deformation compensation rod 210 and the L-shaped welding compensation connecting rod 212, and the smaller the rotation angle of the welding angle compensation plate 202, i.e., the smaller the initial tilt angle. This achieves adaptive adjustment of the initial angle proportional to the workpiece thickness. During the welding process, the workpiece tends to undergo angular deformation due to heat. The thrust generated by the angular deformation further pushes the positioning rod 204 to slide in the opposite direction and continuously drives the component. The angle of the welding angle compensation plate 202 changes continuously with the increase of welding thermal deformation until it is leveled, realizing real-time dynamic compensation throughout the welding process.

[0058] By setting up a welding deformation compensation mechanism 200, the initial welding angle of the workpiece can be adaptively adjusted according to its own thickness, and the angle can be dynamically compensated in real time as the amount of thermal deformation changes during the welding process. This achieves full-process angular deformation control from static pre-compensation to dynamic real-time compensation, solving the problem that traditional rigid fixtures cannot cope with the angular deformation caused by welding thermal expansion. It avoids the technical defects of weld cracking or a surge in residual stress due to complete constraint in thick plate welding, and wave deformation or weld bulging due to excessive constraint in thin plate welding. It significantly improves the dimensional accuracy, weld quality and appearance flatness of the frame components after welding.

[0059] Example 2

[0060] Based on Embodiment 1, this embodiment considers that after the welding deformation compensation mechanism 200 adaptively adjusts the initial tilt angle of the welding angle compensation plate 202 according to the workpiece thickness, if the compensation fixture 302-2 still maintains its original fixed posture, the clamping surface direction will no longer be perpendicular to the workpiece surface, resulting in a tangential component of the clamping force. This not only reduces clamping stability but may also cause the workpiece to slip along the tilted surface during welding vibration. Furthermore, the angle of the welding angle compensation plate 202 continuously changes dynamically during welding, and the fixed-post fixture cannot respond accordingly, further exacerbating the risk of clamping failure. Therefore, this embodiment provides a fixture compensation mechanism 300, which includes a cylinder fixing rod 301 and a fixture fixing plate 302. The cylinder fixing rod 301 is fixed to the right side of the positioning rod 204, and a lifting and starting cylinder 301-1 is fixedly connected to the bottom of the cylinder fixing rod 301. The bottom left side of cylinder 301-1 is fixedly connected to the right side of positioning cylinder 203. Fixture fixing plate 302 is fixed to the top of positioning rod 204. The back end of the bottom of fixture fixing plate 302 is movably connected to synchronous shaft rod 302-1 through a rotating shaft. Compensating fixtures 302-2 are fixedly connected to the left and right sides of synchronous shaft rod 302-1. The bottom inner side of compensating fixture 302-2 is fixedly connected to the inner synchronous pressing plate 302-3. Fixture adjusting tooth plate 302-4 is fixedly connected to the left side of positioning rod 204. Fixture adjusting gear 302-5 is movably connected to the bottom of fixture fixing plate 302 through a rotating shaft. The front end of fixture adjusting gear 302-5 is meshed with the back end of fixture adjusting tooth plate 302-4. Synchronous adjusting shaft block 302-6 is fixedly connected to the left side of fixture adjusting gear 302-5. Synchronous adjusting shaft block 302-6 and synchronous shaft rod 302-1 are connected by a transmission belt.

[0061] The top of the clamp adjusting toothed plate 302-4 penetrates the top of the clamp fixing plate 302, and the inner cavity of the clamp fixing plate 302 and the position corresponding to the clamp adjusting toothed plate 302-4 are provided with a clamp toothed plate groove 302-4-1;

[0062] The cylinder fixing rod 301 extends vertically and is bolted to the right end of the positioning rod 204. The cylinder fixing rod 301 slides synchronously with the positioning rod 204. The bottom of the left side wall of the lifting and starting cylinder 301-1 is fixedly connected to the outer surface of the right side wall of the positioning cylinder 203 via a connecting bracket. The bottom of the clamp fixing plate 302 is welded to the top side wall of the positioning rod 204. The clamp fixing plate 302 slides synchronously with the positioning rod 204. A shaft hole is provided at the bottom rear end of the clamp fixing plate 302, which horizontally penetrates the bottom rear end of the clamp fixing plate 302 in the left-right direction. The synchronous shaft rod 302-1 is a long shaft extending horizontally in the left-right direction. The middle section of the shaft 302-1 passes through the shaft hole and is rotatably connected to the clamp fixing plate 302 through the bearing, so that the synchronous shaft 302-1 can rotate freely around its own axis. The left end and the right end of the synchronous shaft 302-1 extend to the left and right exterior of the clamp fixing plate 302, respectively. There are two sets of compensation clamps 302-2, which are fixedly connected to the left end and the right end of the synchronous shaft 302-1, respectively. Each set of compensation clamps 302-2 is a rectangular clamping structure, and its top is fixedly sleeved on the corresponding end of the synchronous shaft 302-1. The compensation clamps 302-2 swing synchronously around the axis of the synchronous shaft 302-1 as the synchronous shaft 302-1 rotates.

[0063] The synchronous lower pressure plate 302-3 inside the fixture has a flat plate structure and is fixedly connected to the bottom of the inner wall of the compensating fixture 302-2. The bottom plane of the synchronous lower pressure plate 302-3 inside the fixture is the clamping working surface that directly contacts and presses the workpiece. An elastic pad is provided on the clamping working surface to avoid damage to the workpiece surface during clamping. When the compensating fixture 302-2 swings around the synchronous shaft 302-1, the angle of the bottom working surface of the synchronous lower pressure plate 302-3 inside the fixture changes synchronously, and always keeps the compensating fixture 302-2 parallel and in contact with the workpiece surface.

[0064] The clamp adjusting toothed plate 302-4 is a vertically extending rack structure. Its bottom is fixedly connected to the top left side of the positioning rod 204 and located below the clamp fixing plate 302. The back end of the clamp adjusting toothed plate 302-4 is provided with meshing teeth arranged vertically. The top of the clamp adjusting toothed plate 302-4 extends upward and penetrates the top of the clamp fixing plate 302. The inner cavity of the clamp fixing plate 302 and corresponding to the position of the clamp adjusting toothed plate 302-4 are provided with a clamp toothed plate groove 302-4-1. The clamp toothed plate groove 302-4-1 is a through groove structure that penetrates the upper and lower surfaces of the clamp fixing plate 302 vertically. The bottom of the fixed plate 302 is movably connected to the clamp adjusting gear 302-5 via a rotating shaft. The front end of the clamp adjusting gear 302-5 meshes with the meshing teeth of the clamp adjusting gear plate 302-4. When the clamp adjusting gear plate 302-4 moves up and down, it drives the clamp adjusting gear 302-5 to rotate through meshing. The left side of the clamp adjusting gear 302-5 is fixedly connected to the synchronous adjusting shaft block 302-6. The synchronous adjusting shaft block 302-6 is coaxially arranged with the clamp adjusting gear 302-5 and rotates synchronously with the clamp adjusting gear 302-5. The synchronous adjusting shaft block 302-6 and the synchronous shaft rod 302-1 are connected by a transmission belt.

[0065] The clamp adjusting toothed plate 302-4 is in the initial position along with the positioning rod 204. When the positioning rod 204 slides due to the thickness of the workpiece, the positioning rod 204 drives the clamp adjusting toothed plate 302-4 to move synchronously. The clamp adjusting toothed plate 302-4 drives the clamp adjusting gear 302-5 to rotate through meshing. The clamp adjusting gear 302-5 drives the synchronous adjusting shaft block 302-6 to rotate. The synchronous adjusting shaft block 302-6 drives the synchronous shaft rod 302-1 to rotate through the transmission belt. The synchronous shaft rod 302-1 drives the compensation clamp 302-2 to adjust synchronously around the axis of the synchronous shaft rod 302-1, so that the clamping direction of the compensation clamp 302-2 changes from a vertical posture to a deflection posture that is adapted to the tilt angle of the welding angle compensation plate 202. This ensures that the bottom working surfaces of the compensation clamp 302-2 and the synchronous lower pressure plate 302-3 inside the clamp always remain parallel and in contact with the workpiece surface.

[0066] During the welding process, when the workpiece is heated and undergoes angular deformation, pushing the positioning rod 204 to slide further, the above-mentioned linkage continues to respond. The deflection angle of the compensation fixture 302-2 is synchronously adjusted with the dynamic change of the angle of the welding deflection compensation plate 202, realizing real-time tracking of the clamping posture to the change of the workpiece angle throughout the welding process.

[0067] By setting up a fixture compensation mechanism 300, real-time synchronous follow-up compensation of the clamping posture of the compensation fixture 302-2 and the tilt angle of the welding deviation compensation plate 202 is achieved. This ensures that the clamping surface direction of the synchronous lower pressure plate 302-3 inside the fixture is always perpendicular to the workpiece surface and the clamping position always conforms to the actual posture of the workpiece. This eliminates the tangential component of the clamping force, avoids local stress concentration and surface indentation, and improves the clamping stability and reliability throughout the welding process.

[0068] Example 3

[0069] Based on Embodiment 2, this embodiment considers that the clamping compensation mechanism 300 in Embodiment 2 can achieve real-time synchronous follow-up compensation of the clamping posture of the compensation clamp 302-2 and the tilt angle of the welding deviation compensation plate 202, so that the clamping working surface of the synchronous lower pressure plate 302-3 in the clamp is always parallel and in contact with the workpiece surface, eliminating the tangential component of the clamping force and ensuring the adaptability of the clamping posture. However, during the welding process, the continuous vibration generated by welding and the local fluctuations caused by uneven thermal expansion of the workpiece will still cause a slight separation between the compensation clamp 302-2 and the workpiece surface, resulting in fluctuations in the clamping force and slight loosening. Therefore, this embodiment sets up a clamping reinforcement mechanism 400, which includes an upper sealing plate 401 and a lower sealing plate 402. The surface of the upper sealing plate 401 and the positioning cylinder The inner wall of the positioning cylinder 203 is fixedly connected. The left side of the upper sealing plate 401 and the right side of the limiting member 205 are fixedly connected. The front end of the upper sealing plate 401 and the back end of the positioning rod 204 are slidably connected. The surface of the lower sealing plate 402 and the inner wall of the positioning cylinder 203 are slidably connected. The left side of the lower sealing plate 402 and the right side of the limiting member 205 are slidably connected. The front end of the lower sealing plate 402 and the back end of the positioning rod 204 are fixedly connected. The top of the upper sealing plate 401 is fixedly connected to the air pipe 401-1. The end of the air pipe 401-1 away from the upper sealing plate 401 is fixedly connected to the front end of the compensation clamp 302-2. The inner cavity of the compensation clamp 302-2 is provided with an air chamber 401-2. The front opening of the air chamber 401-2 is connected to the back end of the air pipe 401-1. The bottom opening of the air chamber 401-2 is located at the bottom of the compensation clamp 302-2.

[0070] In the initial clamping state, the positioning rod 204 is located in the upper position inside the positioning cylinder 203, and the gap between the lower sealing plate 402 and the upper sealing plate 401 is relatively large. When the positioning rod 204 slides due to the deformation of the welding angle, the positioning rod 204 drives the lower sealing plate 402 to slide downward synchronously, so that the air in the air pipe 401-1 is forced to flow into the cavity, and the bottom of the air cavity 401-2 generates a strong suction force, so that the compensation fixture 302-2 firmly holds the welding workpiece.

[0071] A positioning groove 203-1 is provided on the left side of the positioning cylinder 203 and at the position corresponding to the positioning tooth plate 206. The front end and the back end of the positioning tooth plate 206 are slidably connected to the front end and the back end of the inner wall of the positioning groove 203-1.

[0072] Meanwhile, the positioning groove 203-1 opened on the left side wall of the positioning cylinder 203 not only realizes the guiding sliding of the positioning tooth plate 206, but also serves as a safety pressure relief channel for the sealing cavity. The interior of the positioning cylinder 203, namely the cavity between the upper sealing plate 401 and the lower sealing plate 402, and the chamber formed by the positioning cylinder 203 and the positioning rod 204, when the positioning rod 204 slides and compresses the sealing cavity to generate suction, causes the compensation clamp 302-2 to form a reinforcing clamp, and the gas in the chamber can be naturally discharged through the gap of the positioning groove 203-1, avoiding the formation of excessively high air pressure at the bottom of the chamber due to complete sealing, and preventing the sealing cavity from deforming or bursting due to continuous increase in air pressure.

[0073] By setting up the clamping reinforcement mechanism 400, the sliding displacement energy of the positioning rod 204 caused by the thickness of the workpiece and thermal deformation during the welding process is converted into suction force through the sealed cavity, and then transmitted to the air cavity 401-2 of the compensation clamp 302-2 through the air pipe 401-1 and acted on the workpiece surface to form an auxiliary reinforcement clamping force. This effectively solves the problem of clamping force fluctuation and vibration caused by welding vibration, significantly suppresses the positional displacement of the workpiece during the welding process, and further enhances the clamping effect.

[0074] Working principle: The lifting start cylinder 301-1 lifts the positioning rod 204 and the compensation fixture 302-2 above it, and places the workpiece to be welded on the welding angle compensation plate 202. Then, the lifting force of the lifting start cylinder 301-1 is canceled, allowing the positioning rod 204 to move downward through the fixture spring 204-1, and driving the compensation fixture 302-2 to press down on the workpiece.

[0075] The downward displacement of the positioning rod 204 is determined by the thickness of the workpiece. The thinner the workpiece, the smaller the sliding displacement of the positioning rod 204. When the positioning rod 204 slides downward, it drives the positioning tooth plate 206 to slide downward along the positioning groove 203-1. The positioning tooth plate 206 drives the positioning gear 208 to rotate through meshing. The positioning gear 208 then drives the compensation tooth plate 211 to move upward through meshing. When the compensation tooth plate 211 moves, it drives the deformation compensation rod 210 to slide upward inside the hollow rod sleeve 209. The deformation compensation rod 210 drives the L-shaped welding compensation connecting rod 212 to slide upward along the compensation rod slide groove 209-1. The L-shaped welding compensation connecting rod 212 pulls the bottom side wall of the welding deflection compensation plate 202, so that the welding deflection compensation plate 202 deflects and adjusts around the top of the compensation plate movable rod 201 to form the initial tilt angle.

[0076] As the positioning rod 204 slides downwards due to the workpiece thickness, it simultaneously moves the fixture fixing plate 302 downwards. The fixture fixing plate 302, in turn, moves the compensation fixture 302-2 mounted on it downwards as a whole. Simultaneously, the positioning rod 204 moves the fixture adjusting gear plate 302-4, fixed to its top left side, downwards. The fixture adjusting gear plate 302-4, through engagement, drives the fixture adjusting gear 302-5 to rotate. The fixture adjusting gear 302-5 then drives the synchronous adjusting shaft block 302-6 to rotate. The synchronous adjusting shaft block 302-6 drives the synchronous shaft rod 302-1 to rotate via the transmission belt. The synchronous shaft rod 302-1 drives the compensation fixtures 302-2, which are fixedly connected to its left and right ends, to rotate synchronously around the axis of the synchronous shaft rod 302-1. This causes the clamping surface of the compensation fixture 302-2 to change from a vertical posture to a deflection posture that is adapted to the initial tilt angle of the welding angle compensation plate 202, ensuring that the bottom working surface of the synchronous lower pressure plate 302-3 inside the fixture always remains parallel and in contact with the workpiece surface.

[0077] After welding begins, the workpiece tends to deform due to heat. The thrust generated by the angular deformation further causes the positioning rod 204 to slide downward. As the positioning rod 204 slides downward, the deformation compensation rod 210 and the L-shaped welding compensation connecting rod 212 slide upward, causing the welding angle compensation plate 202 to deflect. The angle of the welding angle compensation plate 202 continues to change with the increase of welding thermal deformation until the angular deformation is completely compensated, thus realizing real-time dynamic compensation throughout the welding process.

[0078] During the welding process, when the positioning rod 204 slides further downward due to thermal deformation, the clamp adjusting tooth plate 302-4 moves further downward, the clamp adjusting gear 302-5 rotates further, the synchronous adjusting shaft block 302-6 rotates further, the transmission belt drives the synchronous shaft rod 302-1 to rotate further, and the compensation clamp 302-2 deflects further. The deflection angle of the compensation clamp 302-2 increases synchronously with the dynamic change of the angle of the welding angle compensation plate 202, realizing real-time tracking of the clamping posture to the change of the workpiece angle throughout the welding process.

[0079] As the positioning rod 204 slides downward due to the workpiece thickness and welding heat deformation, the positioning rod 204 drives the lower sealing plate 402, which is fixedly connected to it, to slide downward synchronously within the positioning cylinder 203. When the lower sealing plate 402 slides downward, the volume of the sealing cavity between the upper sealing plate 401 and the lower sealing plate 402 gradually increases, and the internal gas pressure decreases, forming a negative pressure suction effect. This negative pressure enters the air pipe 401-1 through the gas passage at the top of the upper sealing plate 401, and is transmitted along the air pipe 401-1 to the air chamber 401-2 of the compensation fixture 302-2. The negative pressure in the air chamber 401-2 acts on the workpiece surface through the bottom opening, generating an upward suction force on the workpiece, so that the compensation fixture 302-2 firmly holds the welding plate.

[0080] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible without substantially departing from the novelty and advantages of the subject matter described in this application. For example, variations in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​such as temperature, pressure, etc., installation arrangements, use of materials, color, orientation, etc. For instance, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure performing the function described herein, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0081] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments may be omitted, i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention.

[0082] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A welding support fixture for an automobile frame component, comprising a positioning adjustment mechanism (100), which includes a positioning support base (101), wherein a motor (102) is fixedly connected to the left and right sides of the top of the positioning support base (101), a mounting platform (103) is fixedly connected to the left side of the motor (102), a processing platform (104) is fixedly connected to the inner side of the mounting platform (103), and a mounting groove (105) is fixedly connected to the front and back ends of the top of the processing platform (104), and a positioning plate (106) is slidably connected to the top of the mounting groove (105); characterized in that: Welding deformation compensation mechanism (200) is set on the top of the processing platform (104). The welding deformation compensation mechanism (200) can adaptively adjust the initial angle of the workpiece welding according to the workpiece welding angle deformation and the thickness of the workpiece itself, and can dynamically compensate the initial angle during the welding process to offset the influence of welding angle deformation on the workpiece accuracy. The clamp compensation mechanism (300) is installed on the welding deformation compensation mechanism (200). The clamp compensation mechanism (300) can synchronously adjust the angle of the clamp according to the initial angle of the workpiece welding, so that the direction of the clamping surface and the clamping position are synchronized with the initial angle of the workpiece welding, so that the clamping fixture fits tightly against the workpiece and further fixes the workpiece. The clamping reinforcement mechanism (400) is disposed within the welding deformation compensation mechanism (200). The clamping reinforcement mechanism (400) can be driven by the welding deformation compensation mechanism (200) to make the clamp firmly hold the welding plate during operation, avoid positional deviation caused by shaking and swaying, and further enhance the clamping force.

2. The welding support fixture for automotive frame components according to claim 1, characterized in that: The welding deformation compensation mechanism (200) includes a compensation plate movable rod (201), which is provided in two sets of two rods each. The bottom of the compensation plate movable rod (201) is fixedly connected to the top of the processing platform (104). The inner side of the compensation plate movable rod (201) is movably connected to a welding deflection compensation plate (202) via a rotating shaft. The top of the positioning plate (106) is fixedly connected to a positioning cylinder (203). The right side of the inner wall of the positioning cylinder (203) slides... A positioning rod (204) is dynamically connected. A limiting element (205) is slidably connected to both the front and back ends of the positioning rod (204). The front end of the limiting element (205) is fixedly connected to the front end of the inner wall of the positioning cylinder (203). The left side of the positioning rod (204) is slidably connected to the left side of the inner wall of the positioning cylinder (203). A positioning toothed plate (206) is fixedly connected to the left side of the positioning rod (204). A gear rod (207) is fixedly connected to both the front and back ends of the positioning cylinder (203). A positioning gear (208) is movably connected to the inner side of the gear rod (207) and the left side of the positioning tooth plate (206) via a rotating shaft. A hollow rod sleeve (209) is fixedly connected to the top of the positioning plate (106) and the left side of the positioning cylinder (203). A deformation compensation rod (210) is movably connected to the inner cavity of the hollow rod sleeve (209). A compensation tooth plate (211) is fixedly connected to the right side of the deformation compensation rod (210) through the right side of the hollow rod sleeve (209). The positioning tooth... The left and right sides of the wheel (208) are engaged with the right side of the compensation tooth plate (211) and the left side of the positioning tooth plate (206). The bottom of the deformation compensation rod (210) is fixedly connected with an L-shaped welded compensation connecting rod (212). The left side of the L-shaped welded compensation connecting rod (212) passes through the left side of the hollow rod sleeve (209). The end of the L-shaped welded compensation connecting rod (212) away from the deformation compensation rod (210) is movably connected to the bottom of the welded deflection compensation plate (202) through a shaft.

3. The welding support fixture for automotive frame components according to claim 2, characterized in that: The clamp compensation mechanism (300) includes a cylinder fixing rod (301) and a clamp fixing plate (302). The cylinder fixing rod (301) is fixed to the right side of the positioning rod (204). A lifting start cylinder (301-1) is fixedly connected to the bottom of the cylinder fixing rod (301). The bottom left side of the lifting start cylinder (301-1) is fixedly connected to the right side of the positioning cylinder (203). The clamp fixing plate (302) is fixed to the top of the positioning rod (204). The back end of the bottom of the clamp fixing plate (302) is movably connected to a synchronous shaft rod (302-1) via a rotating shaft. Compensation clamps are fixedly connected to both the left and right sides of the synchronous shaft rod (302-1). (302-2), the bottom of the inner side of the compensation fixture (302-2) is fixedly connected to the inner synchronous pressure plate (302-3), the left side of the positioning rod (204) is fixedly connected to the fixture adjustment tooth plate (302-4), the bottom of the fixture fixing plate (302) is movably connected to the fixture adjustment gear (302-5) through a rotating shaft, the front end of the fixture adjustment gear (302-5) and the back end of the fixture adjustment tooth plate (302-4) are meshed, the left side of the fixture adjustment gear (302-5) is fixedly connected to the synchronous adjustment shaft block (302-6), and the synchronous adjustment shaft block (302-6) and the synchronous shaft rod (302-1) are connected by a transmission belt.

4. The welding support fixture for automotive frame components according to claim 2, characterized in that: The clamping reinforcement mechanism (400) includes an upper sealing plate (401) and a lower sealing plate (402). The surface of the upper sealing plate (401) is fixedly connected to the inner wall of the positioning cylinder (203). The left side of the upper sealing plate (401) is fixedly connected to the right side of the limiting member (205). The front end of the upper sealing plate (401) is slidably connected to the back end of the positioning rod (204). The surface of the lower sealing plate (402) is slidably connected to the inner wall of the positioning cylinder (203). The left side of the lower sealing plate (402) is slidably connected to the right side of the limiting member (205). The front end of the plate (402) and the back end of the positioning rod (204) are fixedly connected. The top of the upper sealing plate (401) is fixedly connected to the air pipe (401-1). The end of the air pipe (401-1) away from the upper sealing plate (401) is fixedly connected to the front end of the compensation clamp (302-2). The inner cavity of the compensation clamp (302-2) is provided with an air chamber (401-2). The front opening of the air chamber (401-2) is connected to the back end of the air pipe (401-1). The bottom opening of the air chamber (401-2) is located at the bottom of the compensation clamp (302-2).

5. A welding support fixture for automotive frame components according to any one of claims 2 to 4, characterized in that: A positioning groove (203-1) is provided on the left side of the positioning cylinder (203) and at the position corresponding to the positioning tooth plate (206). The front end and the back end of the positioning tooth plate (206) are slidably connected to the front end and the back end of the inner wall of the positioning groove (203-1).

6. The welding support fixture for automotive frame components according to claim 5, characterized in that: The bottom of the positioning rod (204) is fixedly connected to a clamping spring (204-1), and the bottom of the clamping spring (204-1) is fixedly connected to the top of the positioning plate (106).

7. The welding support fixture for automotive frame components according to claim 6, characterized in that: A compensating rod groove (209-1) is provided on the left side of the hollow rod sleeve (209) and at the position corresponding to the L-shaped welded compensating connecting rod (212). The compensating rod groove (209-1) slides in conjunction with the L-shaped welded compensating connecting rod (212).

8. The welding support fixture for automotive frame components according to claim 3, characterized in that: The top of the clamp adjusting toothed plate (302-4) penetrates the top of the clamp fixing plate (302), and a clamp toothed plate groove (302-4-1) is provided in the inner cavity of the clamp fixing plate (302) and at the position corresponding to the clamp adjusting toothed plate (302-4).

9. A method for welding and positioning automotive frame components, characterized in that: The automotive frame component welding support fixture according to any one of claims 1 to 8 further includes, The positioning adjustment mechanism (100) drives the motor (102) to rotate and adjust the mounting platform (103) and processing platform (104). The lifting start cylinder (301-1) lifts the positioning rod (204) and the compensation fixture (302-2) above, and places the workpiece to be welded on the welding angle compensation plate (202). Based on the workpiece's own thickness, when the compensation fixture (302-2) is pressed down by the fixture spring (204-1), the positioning rod (204) is pushed to slide inside the positioning cylinder (203). The positioning rod (204) drives the positioning tooth plate (206) to move and is connected to the compensation tooth plate (211) through the positioning gear (208). The compensation tooth plate (211) drives the deformation compensation rod (210) and the L-shaped welding compensation connecting rod (212) to move. The L-shaped welding compensation connecting rod (212) drives the welding angle compensation plate (202) to rotate around the compensation plate movable rod (201). The initial welding angle of the workpiece is adaptively adjusted according to the workpiece thickness to reserve the welding angle deformation compensation allowance. During pre-adjustment, the movement of the positioning rod (204) drives the clamp adjusting gear (302-5) to rotate through the clamp adjusting tooth plate (302-4). The clamp adjusting gear (302-5) drives the synchronous shaft (302-1) to rotate through the synchronous adjusting shaft block (302-6) and the transmission belt, so that the compensation clamp (302-2) deflects synchronously with the initial welding angle, and the clamping surface direction and clamping position are in contact with the workpiece surface to fix the workpiece. During the welding process, the workpiece undergoes angular deformation due to heat. The positioning rod (204) slides further with the thermal expansion of the welding, continuously driving the welding deformation compensation mechanism (200) to dynamically adjust the angle of the welding angle compensation plate (202) to compensate for the welding angle deformation in real time. At the same time, the compensation fixture (302-2) above is adjusted in real time for further fixation. The positioning rod (204) slides and drives the lower sealing plate (402) to slide inside the positioning cylinder (203), compressing the volume of the sealing cavity between the upper sealing plate (401) and the lower sealing plate (402), generating negative pressure suction that is transmitted through the air pipe (401-1) to the air chamber (401-2) of the compensating fixture (302-2). The negative pressure suction acts on the bottom opening of the air chamber, so that the compensating fixture (302-2) generates an auxiliary and enhanced clamping force on the workpiece, preventing vibration and shaking during the welding process from affecting the clamping.

10. A welding and positioning method for automobile frame components according to claim 9, characterized in that: include, During welding pre-adjustment, the thinner the workpiece, the smaller the sliding displacement of the positioning rod (204) in the positioning cylinder (203), the smaller the movement of the positioning tooth plate (206) driving the compensation tooth plate (211) through the positioning gear (208), and the smaller the deflection angle of the welding angle compensation plate (202) driven by the L-shaped welding compensation connecting rod (212), so that the thin plate workpiece obtains a smaller initial tilt angle to match the smaller welding angle deformation during thin plate welding.

Images