Quick replacement device for anti-deformation welding fixture

Abstract

The invention discloses a quick replacement device for an anti-deformation welding fixture, and relates to the technical field of welding fixtures, the quick replacement device comprises a welding fixture main body of a rectangular frame structure, and the inner side of the upper end of the welding fixture main body is slidably connected with a clamping jaw used for clamping a workpiece contact part in the welding fixture main body; one side of the right end of the welding clamp body is rotationally connected with a clamping screw used for rotationally adjusting clamping force, the bottom end of the welding clamp body is fixedly connected with a base used for being connected with a machine tool workbench and providing a stable foundation, and a positioning replacement mechanism is arranged on the inner side of a clamping jaw. An expansion pressure releasing mechanism is arranged on the surface of the upper end of the clamping plate, intermittent impact mechanisms are arranged at the outer ends of the two sides of the clamping jaw, a clamping pin shaft and a barrier column are matched with each other, through the design of the clamping pin shaft, rapid replacement of the welding clamp can be achieved, and the time for replacing and debugging the welding clamp on a welding work station is remarkably shortened.

Description

Technical Field

[0001] The invention relates to the technical field of welding fixtures, and in particular to a quick-changing device for an anti-deformation welding fixture. Background Art

[0002] Anti-deformation welding fixtures are tools used to ensure that the workpiece remains stable and reduces deformation during the welding process. With the increasing requirements of industrial manufacturing, especially in the automotive, aviation and heavy machinery fields, the requirements for welding accuracy and strength are also increasing. Through precise design and application, these fixtures can effectively control thermal expansion and contraction, prevent unnecessary stress and deformation during the welding process, thereby improving welding quality and production efficiency; There are still the following defects in specific use: 1. Thermal expansion and cooling contraction can cause uneven deformation of the workpiece. During the welding process, due to local heating, the workpiece may bend, warp or twist, affecting the shape and dimensional accuracy of the final product. At the same time, during the welding process, the stress generated by the thermal expansion of the local area and the contraction after cooling may cause residual stress in the weld. This stress may cause cracks or reduce the strength and reliability of the welded joint.

[0003] 2. In addition, residual stress may cause cracks or cracks in the welding area, especially in high stress areas and under uneven cooling conditions. Residual stress may reduce the fatigue life of the material, making the workpiece more susceptible to failure during use. Stress concentration may also reduce the strength and toughness of the welded joint, affecting the overall performance of the structure.

[0004] In view of this, the present invention proposes a quick-change device for an anti-deformation welding fixture to compensate for and improve the deficiencies of the prior art. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a quick replacement device for an anti-deformation welding fixture to solve the technical problems raised in the above background technology.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a quick-changing device for an anti-deformation welding fixture, comprising a welding fixture body of a rectangular frame structure, a clamping jaw for clamping the contact part of the workpiece in the welding fixture body being slidably connected to the inner side of the upper end of the welding fixture body, a clamping screw for rotating and adjusting the clamping force being rotatably connected to one side of the right end of the welding fixture body, a base for connecting to a machine tool workbench and providing a stable foundation being fixedly connected to the bottom end of the welding fixture body, a clamping plate for fixing the workpiece panel being fixedly connected to the top end of the side of the welding fixture body away from the base, a positioning and replacement mechanism being arranged on the inner side of the clamping jaw, an expansion and pressure-releasing mechanism being arranged on the upper end surface of the clamping plate, and intermittent impact mechanisms being arranged on the outer ends of both sides of the clamping jaw; The positioning and changing mechanism is used to accurately position the workpiece at the welding position; The expansion and pressure-releasing mechanism is used to timely reduce the clamping force to avoid the generation of indentations when the workpiece expands thermally; The intermittent impact mechanism is used to strike the surface of the thermally expanded workpiece to cause slight plastic deformation of the workpiece.

[0007] Furthermore, the positioning replacement mechanism includes a bottom wedge plate fixedly connected to the upper surface of the clamp plate, the bottom wedge plate is fixedly connected to an obstacle column on the outer wall on one side away from the clamp plate, and the obstacle columns are symmetrically arranged with a plurality of them about the central axis of the bottom wedge plate, the bottom wedge plate is slidably connected to an upper slot plate on the surface of one end away from the clamp plate, the upper slot plate is fixedly connected to an external connecting plate on the outer wall on one side away from the bottom wedge plate, and two external connecting plates are symmetrically arranged with the central axis of the bottom wedge plate, the two external connecting plates are both slidably connected with a pin shaft passing through the interior of the two external connecting plates, and the two pin shafts are fixedly connected to a spring on the outer wall at one end of the external connecting plate, the top of the upper slot plate on the side away from the bottom wedge plate is fixedly connected to a placement slot plate, the outer wall of the upper slot plate on the side away from the placement slot plate is fixedly connected to an external block, and the inner wall of the clamping jaw is fixedly connected to a support block.

[0008] Furthermore, the plurality of obstacle columns are evenly distributed longitudinally, and gaps of equal width are provided between adjacent obstacle columns. A concave groove is provided on the outer wall of the upper end of the bottom wedge plate, and the upper groove plate is slidably connected to the inside of the concave groove provided on the outer wall of the upper end of the bottom wedge plate.

[0009] Furthermore, the initial positions of the two said bayonet shafts are engaged with the equal-width gaps arranged between adjacent obstacle columns, and a recessed surface is provided inside the said placement slot plate, and the internal diameter size of the said placement slot plate is adapted to the diameter size of the workpiece.

[0010] The cam is provided with a toothed plate at one end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the other end, and a toothed plate is provided at the

[0011] Furthermore, the ends of the two connecting rods away from the crank are both rotatably connected to the bottom end surface of the fixed plate, and the long armature plate penetrates and is slidably connected to the outer walls of the two fixed shafts.

[0012] Furthermore, the initial position of the finger pressure plate is at the same level as the placement slot plate, the initial position of the electric telescopic rod is at the same level as the external block, and the initial position of the touch switch conflicts with the electric telescopic rod.

[0013] Furthermore, the intermittent impact mechanism includes a square plate fixedly connected to the upper surface of the splint, the square plate is fixedly connected to a support rod on the surface of one end away from the splint, and two support rods are symmetrically arranged about the central axis of the square plate, the two support rods are rotatably connected to an arc block at the bottom of one end away from the square plate, and the two support rods are rotatably connected to a rotating disk at the top of one end away from the square plate, the outer wall of one end of the arc block away from the support rod is fixedly connected to a long axis, the outer wall of one end of the long axis away from the arc block is fixedly connected to a hammer block, the outer wall of one side of the rotating disk away from the support rod is rotatably connected to a long rod, the outer wall of one end of the long rod away from the rotating disk is fixedly connected to a cam disk, and the outer wall of one end of the arc block away from the long axis is fixedly connected to a concave and convex block.

[0014] Furthermore, the initial position of the hammer block is at the same level as the upper groove plate, and the initial position of the cam disc is in conflict with the outer wall of the bottom end of the fixed shaft.

[0015] Furthermore, the outer wall of the rotating wheel disc is provided with an arc-shaped convex portion, and the initial position of the concave-convex block conflicts with the arc-shaped convex portion provided on the outer wall of the rotating wheel disc.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention utilizes the cooperation between the bayonet shaft and the barrier column. Through the design of the bayonet shaft, the welding fixture can be quickly replaced, which significantly shortens the time for replacing and debugging the welding fixture on the welding workstation. In addition, the design of the bayonet shaft helps to achieve accurate positioning of the welding fixture, reduce assembly errors, and improve welding accuracy. In addition, accurate positioning and clamping can limit deformation during welding, ensuring that the weldment after welding meets the shape and size required by the product drawing. The use of a positioning replacement mechanism with a bayonet shaft can reduce auxiliary time such as marking, alignment, and measurement, thereby improving production efficiency. By flexibly replacing the fixture, the layout of the production line can be optimized, and the utilization rate of the equipment and the flexibility of the production line can be improved. Finally, the design of the bayonet shaft helps to improve the repeatable positioning accuracy of the fixture, ensuring that the same positioning effect can be achieved after each replacement. By reducing assembly errors and reducing labor intensity, the service life of the fixture can be extended, and the maintenance and replacement costs can be reduced. (2) The present invention utilizes the finger pressure plate and the long chock plate to cooperate with each other. The expansion and pressure-releasing mechanism can timely reduce the clamping force when the workpiece expands thermally, thereby relieving thermal stress and reducing welding deformation. By loosening the pressure, it can ensure that the workpiece maintains a relatively stable size during the welding process, avoid dimensional changes caused by thermal stress, and improve the dimensional accuracy of the welded parts. In addition, the expansion and pressure-releasing mechanism helps to maintain the stable position of the workpiece during the welding process, making the formation of the weld more uniform and controllable, thereby optimizing the weld quality and reducing welding defects. In addition, reducing welding deformation means that the welded parts can more accurately meet the design requirements, improve welding accuracy and consistency, and the expansion and pressure-releasing mechanism can reduce the clamping force when the workpiece expands thermally, avoid the generation of surface defects such as indentations or scratches, and protect the integrity of the workpiece surface. Finally, the expansion and pressure-releasing mechanism can reduce the wear of the contact surface between the fixture and the workpiece, and extend the service life of the fixture and the workpiece. (3) The present invention utilizes the hammer block and the concave and convex block to cooperate with each other, and the intermittent impact mechanism strikes the surface of the workpiece after thermal expansion, so that the weld can obtain a certain expansion energy, thereby eliminating or reducing these residual stresses. In addition, by striking, the stress can be redistributed inside the workpiece, reducing the local stress peak and improving the stability of the overall structure. The striking can also cause the weld metal to obtain a certain vibration and extrusion, which is helpful for the densification of the weld metal, reducing defects such as pores and slag inclusions in the weld, and improving the mechanical properties of the weld. At the same time, by eliminating the welding residual stress by striking, the subsequent stress elimination and correction processing procedures can be reduced, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main stereoscopic structure of the present invention; Figure 2 It is a schematic diagram of a partial three-dimensional structure of the positioning and replacement mechanism of the present invention; Figure 3It is a three-dimensional structural schematic diagram of the position relationship between the bottom wedge plate and the upper groove plate of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the position relationship between the latch shaft and the obstacle column of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the position relationship between the external block and the electric telescopic rod of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the position relationship between the finger pressure plate and the fixed axis of the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the position relationship between the finger pressure plate and the cam plate of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the positional relationship between the rotating wheel and the concave and convex blocks of the present invention.

[0018] The numbers in the figure are: 1. welding fixture body; 11. clamping jaws; 12. clamping screws; 13. base; 14. clamping plate; 2. positioning and replacement mechanism; 21. bottom wedge plate; 22. obstacle column; 23. upper slot plate; 24. external plate; 25. bayonet pin shaft; 26. spring; 27. slot plate; 28. external block; 29. ​​support block; 3. expansion and pressure release mechanism; 31. connection block; 32. fixing plate; 33 , telescopic cylinder; 34, bottom block; 35, crank; 36, connecting rod; 37, rotating rod; 38, long title plate; 39, fixed shaft; 310, finger pressure plate; 311, electric telescopic rod; 312, touch switch; 4, intermittent impact mechanism; 41, square plate; 42, support rod; 43, arc block; 44, rotating wheel; 45, long shaft; 46, hammer block; 47, long rod; 48, cam disk; 49, concave and convex block. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention; Embodiments of the present invention A quick-change device for anti-deformation welding fixtures, reference Figure 1 As shown, it includes a welding fixture body 1 of a rectangular frame structure, a clamping jaw 11 for clamping the contact part of the workpiece in the welding fixture body 1 is slidably connected to the inner side of the upper end of the welding fixture body 1, a clamping screw 12 for rotating and adjusting the clamping force is rotatably connected to one side of the right end of the welding fixture body 1, a base 13 for connecting to a machine tool workbench and providing a stable foundation is fixedly connected to the bottom end of the welding fixture body 1, and a clamping plate 14 for fixing the workpiece panel is fixedly connected to the top of the side of the welding fixture body 1 away from the base 13; In view of the above-mentioned quick replacement device for an anti-deformation welding fixture, it can be specifically implemented as follows: A positioning and changing mechanism 2 is provided on the inner side of the clamping jaw 11, an expansion and pressure-releasing mechanism 3 is provided on the upper end surface of the clamping plate 14, and intermittent impact mechanisms 4 are provided on the outer ends of both sides of the clamping jaw 11; refer to Figure 2 As shown, the positioning and changing mechanism 2 is used to accurately position the workpiece at the welding position; refer to Figure 3 As shown, the positioning and replacement mechanism 2 includes a bottom wedge plate 21 fixedly connected to the upper surface of the clamping plate 14, an outer wall of the side of the bottom wedge plate 21 away from the clamping plate 14 is fixedly connected to an obstacle column 22, and a plurality of obstacle columns 22 are symmetrically arranged with the central axis of the bottom wedge plate 21, an upper slot plate 23 is slidably connected to the surface of one end of the bottom wedge plate 21 away from the clamping plate 14, an outer wall of the side of the upper slot plate 23 away from the bottom wedge plate 21 is fixedly connected to an external plate 24, and two external plates 24 are symmetrically arranged with the central axis of the bottom wedge plate 21, and a bayonet shaft 25 is slidably connected to the inside of the two external plates 24, and the outer walls of the ends of the two bayonet shafts 25 close to the external plates 24 are fixedly connected to a spring 26, a top end of the upper slot plate 23 away from the bottom wedge plate 21 is fixedly connected to a placement slot plate 27, an outer wall of the upper slot plate 23 away from the placement slot plate 27 is fixedly connected to an external block 28, and an inner wall of the clamping jaw 11 is fixedly connected to a support block 29; refer to Figure 3 As shown, a plurality of obstacle columns 22 are evenly distributed in the longitudinal direction, and gaps of equal width are provided between adjacent obstacle columns 22. A concave groove is provided on the upper outer wall of the bottom wedge-shaped plate 21, and the upper groove plate 23 is slidably connected to the inside of the concave groove provided on the upper outer wall of the bottom wedge-shaped plate 21; refer to Figure 4 As shown, the initial positions of the two bayonet shafts 25 are clamped at the gaps of equal width set between the adjacent obstacle columns 22, and a concave surface is opened inside the placement slot plate 27, and the inner diameter size of the placement slot plate 27 is adapted to the diameter size of the workpiece; Summary 1: Compared with the prior art, inaccurate positioning of the workpiece can easily lead to welding deformation. The present invention can realize the rapid replacement of welding fixtures through the design of the pin shaft 25, which significantly shortens the time for replacing and debugging welding fixtures on the welding workstation. In addition, the design of the pin shaft 25 helps to achieve accurate positioning of the welding fixture, reduce assembly errors, and improve welding accuracy. In addition, accurate positioning and clamping can limit deformation during welding, ensuring that the weldment after welding meets the shape and size required by the product drawings. The use of the positioning and replacement mechanism 2 with the pin shaft 25 can reduce auxiliary time such as marking, alignment, and measurement, improve production efficiency, and through flexible replacement of fixtures, the layout of the production line can be optimized, and the utilization rate of equipment and the flexibility of the production line can be improved. Finally, the design of the pin shaft 25 helps to improve the repeatability of the fixture. The positioning effect can be achieved after each replacement, and the service life of the fixture can be extended by reducing assembly errors and reducing labor intensity, and the maintenance and replacement costs can be reduced.

[0020] refer to Figure 5 As shown, the expansion and pressure-releasing mechanism 3 is used to timely reduce the clamping force to avoid the generation of indentations when the workpiece expands thermally; refer to Figure 5 As shown, the expansion and pressure release mechanism 3 includes a connecting block 31 that penetrates and is slidably connected to the inner wall of the clamping jaw 11, a fixing plate 32 is fixedly connected to the outer wall of the connecting block 31 on one side away from the clamping jaw 11, a telescopic cylinder 33 is fixedly connected to the outer wall of the fixing plate 32 on one end away from the connecting block 31, a bottom block 34 is fixedly connected to the end of the telescopic cylinder 33 close to the fixing plate 32, a crank 35 is rotatably connected to the outer wall of the side of the bottom block 34 away from the telescopic cylinder 33, two cranks 35 are symmetrically arranged around the central axis of the bottom block 34, and the inner walls of the ends of the two cranks 35 away from the bottom block 34 are both rotatably connected to the connecting rod 3 6. The outer walls of the ends of the two connecting rods 36 close to the crank 35 are rotatably connected with a rotating rod 37. The ends of the two rotating rods 37 away from the connecting rods 36 are fixedly connected with a long chute plate 38. The bottom end of the fixed plate 32 is fixedly connected with a fixed shaft 39. Two fixed shafts 39 are symmetrically arranged with the central axis of the fixed plate 32. The bottom surfaces of both ends of the long chute plate 38 close to the fixed shaft 39 are fixedly connected with finger pressure plates 310. The outer wall of one side of the long chute plate 38 close to the external block 28 is penetrated and fixedly connected with an electric telescopic rod 311. The outer wall of one side of the fixed plate 32 close to the electric telescopic rod 311 is fixedly connected with a touch switch 312. refer to Figure 5 As shown, the ends of the two connecting rods 36 away from the crank 35 are both rotatably connected to the bottom end surface of the fixed plate 32, and the long bracket plate 38 penetrates and is slidably connected to the outer walls of the two fixed shafts 39; refer to Figure 6As shown, the initial position of the finger pressure plate 310 is at the same level as the placement slot plate 27, the initial position of the electric telescopic rod 311 is at the same level as the external block 28, and the initial position of the touch switch 312 is in conflict with the electric telescopic rod 311; Summary 2: Compared with the prior art, the workpiece expands due to heat and then contracts during the cooling process. This process will generate thermal stress. The expansion and pressure-releasing mechanism 3 of the present invention can reduce the clamping force in time when the workpiece expands thermally, thereby alleviating thermal stress and reducing welding deformation. By loosening the pressure, it can ensure that the workpiece maintains a relatively stable size during the welding process, avoid dimensional changes caused by thermal stress, and improve the dimensional accuracy of the welded parts. In addition, the expansion and pressure-releasing mechanism 3 helps to maintain the stable position of the workpiece during the welding process, making the formation of the weld more uniform and controllable, thereby optimizing the weld quality and reducing welding defects. In addition, reducing welding deformation means that the welded parts can meet the design requirements more accurately, improve welding accuracy and consistency, and the expansion and pressure-releasing mechanism 3 can reduce the clamping force when the workpiece expands thermally, avoid the generation of surface defects such as indentations or scratches, and protect the integrity of the workpiece surface. Finally, the expansion and pressure-releasing mechanism 3 can reduce the wear of the contact surface between the fixture and the workpiece, and extend the service life of the fixture and the workpiece.

[0021] refer to Figure 7 As shown, the intermittent impact mechanism 4 is used to strike the surface of the thermally expanded workpiece to cause a slight plastic deformation of the workpiece; refer to Figure 7 As shown, the intermittent impact mechanism 4 includes a square plate 41 fixedly connected to the upper surface of the clamping plate 14, the surface of one end of the square plate 41 away from the clamping plate 14 is fixedly connected to a support rod 42, two support rods 42 are symmetrically arranged with the central axis of the square plate 41, the bottom of one end of the two support rods 42 away from the square plate 41 is rotatably connected to an arc block 43, the top of one end of the two support rods 42 away from the square plate 41 is rotatably connected to a rotating disk 44, the outer wall of one end of the arc block 43 away from the support rod 42 is fixedly connected to a long axis 45, the outer wall of one end of the long axis 45 away from the arc block 43 is fixedly connected to a hammer block 46, the outer wall of one side of the rotating disk 44 away from the support rod 42 is rotatably connected to a long rod 47, the outer wall of one end of the long rod 47 away from the rotating disk 44 is fixedly connected to a convex shaft disk 48, and the outer wall of one end of the arc block 43 away from the long axis 45 is fixedly connected to a concave and convex block 49; refer to Figure 7 As shown, the initial position of the hammer block 46 is at the same level as the upper groove plate 23, and the initial position of the cam plate 48 is in conflict with the outer wall of the bottom end of the fixed shaft 39; refer to Figure 7 As shown, the outer wall of the rotating wheel 44 is provided with an arc-shaped convex portion, and the initial position of the concave-convex block 49 conflicts with the arc-shaped convex portion provided on the outer wall of the rotating wheel 44; Summary 3: Compared with the local heating and cooling of the workpiece in the prior art, which will produce welding residual stress, the intermittent impact mechanism 4 of the present invention taps the surface of the workpiece after thermal expansion, so that the weld can obtain a certain expansion energy, thereby eliminating or reducing these residual stresses. In addition, by tapping, the stress can be redistributed inside the workpiece, reducing the local stress peak and improving the stability of the overall structure. The tapping can also cause the weld metal to obtain a certain vibration and extrusion, which is helpful for the densification of the weld metal, reducing defects such as pores and slag inclusions in the weld, and improving the mechanical properties of the weld. At the same time, by eliminating welding residual stress by tapping, the subsequent stress elimination and correction processing steps can be reduced, thereby improving production efficiency.

[0022] The complete working principle and steps of the above embodiment are as follows: Initial qualification: Figure 1 As shown, preparation work: first, the operator fixes the base 13 of the fixture on the welding fixture body 1. The base 13 provides stable support for the entire fixture to ensure that the fixture does not move during the welding process; install the clamp 14: then install the clamp 14 on the base 13. The clamp 14 is used to support and position the workpiece to be welded. Its surface usually has a special design for aligning and fixing the workpiece; place the workpiece: place the workpiece to be welded on the clamp 14. At this time, the workpiece needs to be accurately aligned to ensure the accuracy of welding; adjust the clamping jaw 11: use the clamping jaw 11 to adjust the position of the workpiece. The clamping jaw 11 is the most important part of the fixture. It ensures that the workpiece remains in place during welding by adjusting and clamping. Stable, without displacement; clamping the workpiece: by rotating the clamping screw 12, the clamping jaws 11 are fastened to the workpiece. The function of the clamping screw 12 is to firmly fix the jaws on the workpiece to prevent the workpiece from deforming or moving during welding; welding operation: after the fixture fixes the workpiece, the welding operation is carried out. The design of the fixture ensures the stability of the workpiece, so that the welding process can maintain accuracy and consistency; inspection and adjustment: after welding is completed, check the quality of the welding part to ensure that there is no deformation or inconsistency. If any problems are found, they can be corrected by adjusting the position or clamping force of the fixture; unloading the workpiece: after welding is completed, loosen the clamping screw 12, remove the clamping jaws 11, and then remove the workpiece from the clamp 14.

[0023] When using: Positioning change mechanism for accurately positioning the workpiece at the welding position 2 steps: like Figures 2 to 4As shown, when the operator places the workpiece to be welded on the clamping plate 14, since the upper end of the upper slot plate 23 is fixedly connected to the placement slot plate 27, the operator only needs to place the workpiece to be welded inside the placement slot plate 27, and then move the upper slot plate 23 in the concave slot opened on the outer wall of the bottom wedge plate 21 until the support block 29 fixedly connected to the outer wall of the clamping jaw 11 contacts the surface of the workpiece to be welded, and then press down the bayonet shaft 25 that passes through and slides inside the external plate 24, so that the end of the bayonet shaft 25 away from the external plate 24 is completely stuck between the adjacent obstacle columns 22. The gap set and the spring 26 fixedly connected to the outer wall of the bayonet shaft 25 will stretch downward, thereby achieving a quick installation and positioning effect on the clamping of the workpiece to be welded. Similarly, when the workpiece to be welded is completed, it is only necessary to reset the bayonet shaft 25 upward to disengage from the gap set between the adjacent obstacle columns 22, and then move the upper slot plate 23 to leave the clamping area of ​​the clamping jaws 11, so as to achieve a quick detachment effect on the clamping of the workpiece to be welded. In addition, the upper slot plate 23 will drive the external block 28 fixedly connected to the outer wall of one side of the upper slot plate 23 to move synchronously during the movement process; The expansion and pressure-releasing mechanism is used to timely reduce the clamping force to avoid the formation of indentations when the workpiece expands thermally. 3 steps: like Figures 5 and 6 As shown, when the upper slot plate 23 moves, it will drive the external block 28 fixedly connected to the outer wall of one side of the upper slot plate 23 to move synchronously, and the external block 28 will touch the control switch at the bottom end of the electric telescopic rod 311, and then the electric telescopic rod 311 moves upward and extends to touch the touch switch 312, thereby the touch switch 312 drives the telescopic cylinder 33 to move downward and extend, and then the bottom block 34 fixedly connected to one end of the telescopic cylinder 33 will move downward, so that the crank 35 connected to the outer wall of one side of the bottom block 34 will deflect to both sides, so that the connecting rod 36 will move along with the crank The outward deflection of the crank 35 causes an upward deflection. At the same time, the deflection of the crank 35 to both sides also pushes the rotating rod 37 connected to one end of the crank 35 to deflect inward in the same direction. Therefore, the inward deflection of the rotating rod 37 causes the long armature plate 38 fixedly connected to one end of the rotating rod 37 to slide downward on the outer wall of the fixed shaft 39. As a result, the finger pressure plates 310 fixedly connected to both ends of the long armature plate 38 move together with the downward sliding of the long armature plate 38, thereby squeezing the surface of the workpiece to be welded placed in the placement slot plate 27, so as to relieve thermal stress and reduce welding deformation. An intermittent impact mechanism used to strike the surface of a thermally expanded workpiece to cause a slight plastic deformation of the workpiece. 4 steps: like Figures 7 and 8As shown, when the finger pressure plate 310 moves together with the long title plate 38 sliding downward, the bottom end of the finger pressure plate 310 touches the outer wall of the cam plate 48, and then the cam plate 48 pushes the long rod 47 to deflect to the right, so that the rotating wheel 44 connected to the outer wall of one end of the long rod 47 rotates, and the convex part provided on the outer wall of the rotating wheel 44 squeezes the concave-convex block 49 so that the concave-convex block 49 deflects downward, and the downward deflection of the concave-convex block 49 drives the arc block 43 connected to the inner wall of the bottom end of the support rod 42 to deflect downward together, and then the arc block The long shaft 45 fixedly connected at one end of 43 and the hammer block 46 fixedly connected at one end of the long shaft 45 will deflect upward along with the downward deflection of the arc block 43, so that when the rotating wheel 44 rotates until the convex part arranged on the outer wall of the rotating wheel 44 is separated from the surface of the concave-convex block 49, the deflected concave-convex block 49 will bring the arc block 43 to reset, thereby driving the long shaft 45 and the hammer block 46 to reset, so that the surface of the workpiece to be welded placed in the placement slot plate 27 can be knocked by the reciprocating movement of the deflection reset of the hammer block 46, thereby releasing part of the welding stress; Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-change device for an anti-deformation welding fixture, comprising a welding fixture body (1) of a rectangular frame structure, wherein a clamping jaw (11) is slidably connected to the inner side of the upper end of the welding fixture body (1) for clamping a workpiece contact portion in the welding fixture body (1), a clamping screw (12) is rotatably connected to one side of the right end of the welding fixture body (1) for rotatably adjusting the clamping force, a base (13) is fixedly connected to the bottom end of the welding fixture body (1) for connecting to a machine tool workbench and providing a stable foundation, and a clamping plate (14) is fixedly connected to the top end of a side of the welding fixture body (1) away from the base (13) for fixing a workpiece panel, characterized in that: A positioning and replacement mechanism (2) is provided on the inner side of the clamping jaw (11), an expansion and pressure-releasing mechanism (3) is provided on the upper end surface of the clamping plate (14), and intermittent impact mechanisms (4) are provided on the outer ends of both sides of the clamping jaw (11); The positioning and replacement mechanism (2) is used to accurately position the workpiece at the welding position; The expansion and pressure-releasing mechanism (3) is used to timely reduce the clamping force when the workpiece expands thermally to avoid the generation of indentations; The intermittent impact mechanism (4) is used to strike the surface of a thermally expanded workpiece to cause slight plastic deformation of the workpiece.

2. The quick-change device for an anti-deformation welding fixture according to claim 1, characterized in that: The positioning replacement mechanism (2) comprises a bottom wedge plate (21) fixedly connected to the upper surface of the clamping plate (14); an outer wall of the bottom wedge plate (21) on a side away from the clamping plate (14) is fixedly connected to an obstacle column (22); a plurality of the obstacle columns (22) are symmetrically arranged about the central axis of the bottom wedge plate (21); an upper groove plate (23) is slidably connected to the surface of one end of the bottom wedge plate (21) away from the clamping plate (14); an outer wall of the upper groove plate (23) on a side away from the bottom wedge plate (21) is fixedly connected to an external connecting plate (24); and the external connecting plate (24) is symmetrically arranged about the central axis of the bottom wedge plate (21). Two wedge-shaped plates (21) are symmetrically arranged around the central axis, and a latch shaft (25) is slidably connected to the interior of the two external connecting plates (24), and the outer walls of the two latch shafts (25) at one end close to the external connecting plates (24) are fixedly connected to a spring (26), and the top of the upper slot plate (23) away from the bottom wedge-shaped plate (21) is fixedly connected to a placement slot plate (27), and the outer wall of the upper slot plate (23) away from the placement slot plate (27) is fixedly connected to an external block (28), and the inner wall of the clamping jaws (11) is fixedly connected to a support block (29).

3. The quick-change device for an anti-deformation welding fixture according to claim 2, characterized in that: The plurality of obstacle columns (22) are evenly distributed in the longitudinal direction, and gaps of equal width are provided between adjacent obstacle columns (22). A concave groove is provided on the upper outer wall of the bottom wedge-shaped plate (21), and the upper groove plate (23) is slidably connected to the inside of the concave groove provided on the upper outer wall of the bottom wedge-shaped plate (21).

4. The quick-change device for an anti-deformation welding fixture according to claim 2, characterized in that: The initial positions of the two latch shafts (25) are latched at equal-width gaps between adjacent obstacle columns (22), a recessed surface is provided inside the placement slot plate (27), and the internal diameter of the placement slot plate (27) is adapted to the diameter of the workpiece.

5. The quick-change device for an anti-deformation welding fixture according to claim 1, characterized in that: The expansion and pressure-releasing mechanism (3) comprises a connecting block (31) which penetrates and is slidably connected to the inner wall of the clamping jaw (11); a fixing plate (32) is fixedly connected to the outer wall of the connecting block (31) on a side away from the clamping jaw (11); a telescopic cylinder (33) is fixedly connected to the outer wall of the fixing plate (32) on an end away from the connecting block (31); a bottom block (34) is fixedly connected to the end of the telescopic cylinder (33) close to the fixing plate (32); a crank (35) is rotatably connected to the outer wall of the side of the bottom block (34) away from the telescopic cylinder (33); two cranks (35) are symmetrically arranged about the central axis of the bottom block (34); the inner walls of the ends of the two cranks (35) away from the bottom block (34) are both rotatably connected to a connecting rod (36) ), the outer walls of one end of the two connecting rods (36) close to the crank (35) are rotatably connected to a rotating rod (37), the ends of the two rotating rods (37) away from the connecting rods (36) are fixedly connected to a long chute plate (38), the bottom end of the fixed plate (32) is fixedly connected to a fixed shaft (39), two fixed shafts (39) are symmetrically arranged around the central axis of the fixed plate (32), the bottom surfaces of both ends of the long chute plate (38) close to the fixed shaft (39) are fixedly connected to finger pressure plates (310), the outer wall of one side of the long chute plate (38) close to the external block (28) is penetrated and fixedly connected to an electric telescopic rod (311), and the outer wall of one side of the fixed plate (32) close to the electric telescopic rod (311) is fixedly connected to a touch switch (312).

6. The quick-change device for anti-deformation welding fixture according to claim 5, characterized in that: The ends of the two connecting rods (36) away from the crank (35) are both rotatably connected to the bottom end surface of the fixed plate (32), and the long armature plate (38) penetrates and is slidably connected to the outer walls of the two fixed shafts (39).

7. The quick-change device for an anti-deformation welding fixture according to claim 5, characterized in that: The initial position of the finger pressure plate (310) is at the same level as the placement slot plate (27), the initial position of the electric telescopic rod (311) is at the same level as the external block (28), and the initial position of the touch switch (312) is in conflict with the electric telescopic rod (311).

8. The quick-change device for an anti-deformation welding fixture according to claim 1, characterized in that: The intermittent impact mechanism (4) comprises a square plate (41) fixedly connected to the upper surface of the clamping plate (14); a support rod (42) is fixedly connected to the surface of one end of the square plate (41) away from the clamping plate (14); two support rods (42) are symmetrically arranged about the central axis of the square plate (41); an arc block (43) is rotatably connected to the bottom of one end of the two support rods (42) away from the square plate (41); and a rotating wheel (44) is rotatably connected to the top of one end of the two support rods (42) away from the square plate (41). An outer wall of one end of the arc block (43) away from the support rod (42) is fixedly connected to a long axis (45), an outer wall of one end of the long axis (45) away from the arc block (43) is fixedly connected to a hammer block (46), an outer wall of one side of the rotating wheel disc (44) away from the support rod (42) is rotatably connected to a long rod (47), an outer wall of one end of the long rod (47) away from the rotating wheel disc (44) is fixedly connected to a convex shaft disc (48), and an outer wall of one end of the arc block (43) away from the long axis (45) is fixedly connected to a concave-convex block (49).

9. The quick-change device for an anti-deformation welding fixture according to claim 8, characterized in that: The initial position of the hammer block (46) is at the same level as the upper groove plate (23), and the initial position of the cam plate (48) is in conflict with the outer wall of the bottom end of the fixed shaft (39).

10. The quick-change device for an anti-deformation welding fixture according to claim 8, characterized in that: The outer wall of the rotating wheel disc (44) is provided with an arc-shaped convex portion, and the initial position of the concave-convex block (49) is in conflict with the arc-shaped convex portion provided on the outer wall of the rotating wheel disc (44).

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