A quick replacement device for an anti-deformation welding fixture

Abstract

The present invention discloses a quick replacement device for an anti-deformation welding fixture, which relates to the technical field of welding fixtures. It includes a welding fixture main body with a rectangular frame structure. Inside the upper end of the welding fixture main body, there is a clamping jaw that is slidably connected and used to clamp the workpiece contact part in the welding fixture main body. On one side of the right end of the welding fixture main body, there is a clamping screw that is rotatably connected and used to rotate and adjust the clamping force. At the bottom end of the welding fixture main body, there is a base that is fixedly connected and used to connect with the machine tool workbench and provide a stable foundation. A positioning and replacement mechanism is arranged inside the clamping jaw, an expansion and pressure-relieving mechanism is arranged on the upper surface of the clamping plate, and an intermittent impact mechanism is arranged at the outer ends of both sides of the clamping jaw. By the mutual cooperation of the clamping pin shaft and the obstacle post, through the design of the clamping pin shaft, the quick replacement of the welding fixture can be realized, and the time for replacing and debugging the welding fixture at the welding workstation is significantly shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of welding jigs, and particularly to a quick replacement device for an anti-deformation welding jig. Background Art

[0002] An anti-deformation welding jig is a tool used to ensure the stability of a workpiece during the welding process and reduce deformation. With the improvement of industrial manufacturing requirements, especially in the fields of automobiles, aviation, and heavy machinery, the requirements for welding accuracy and strength are also increasing continuously. These jigs can effectively control thermal expansion and contraction through precise design and application, prevent unnecessary stress and deformation during the welding process, thereby improving the welding quality and production efficiency;

[0003] However, there are still the following defects in specific use:

[0004] 1. Thermal expansion and cooling contraction can cause non-uniform 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 in a 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.

[0005] 2. In addition, residual stress may cause cracks or cracking in the welding area, especially in high-stress areas and under non-uniform cooling conditions, and residual stress may cause a decrease in the fatigue life of the material, making the workpiece more likely to fail during use. Moreover, stress concentration may cause a decrease in the strength and toughness of the welded joint, affecting the overall performance of the structure.

[0006] Therefore, in view of this, the present invention proposes a quick replacement device for an anti-deformation welding jig to make up for and improve the deficiencies of the prior art. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides a quick replacement device for an anti-deformation welding jig to solve the technical problems raised in the above background art.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows: A quick replacement device for an anti-deformation welding fixture, including a welding fixture main body with a rectangular frame structure. The inner side of the upper end of the welding fixture main body is slidably connected with a clamping jaw for clamping the contact part of the workpiece in the welding fixture main body. One side of the right end of the welding fixture main body is rotatably connected with a clamping screw for rotating and adjusting the clamping force. The bottom end of the welding fixture main body is fixedly connected with a base for connecting with the machine tool workbench and providing a stable foundation. The top end of the side of the welding fixture main body away from the base is fixedly connected with a clamping plate for fixing the workpiece panel. A positioning and replacement mechanism is arranged inside the clamping jaw. An expansion and pressure relief mechanism is arranged on the upper surface of the clamping plate. An intermittent impact mechanism is arranged at the outer ends of both sides of the clamping jaw;

[0009] The positioning and replacement mechanism is used to accurately position the workpiece at the welding position;

[0010] The expansion and pressure relief mechanism is used to timely reduce the clamping force when the workpiece thermally expands to avoid the generation of indentation marks;

[0011] The intermittent impact mechanism is used to strike the surface of the thermally expanded workpiece to cause slight plastic deformation of the workpiece.

[0012] Further, the positioning and replacement mechanism includes a bottom wedge plate fixedly connected to the upper surface of the clamping plate. An obstacle column is fixedly connected to the outer wall of the side of the bottom wedge plate away from the clamping plate. A plurality of obstacle columns are symmetrically arranged with the center of the bottom wedge plate as the axis. The upper groove plate is slidably connected to the surface of the end of the bottom wedge plate away from the clamping plate. An external connection plate is fixedly connected to the outer wall of the side of the upper groove plate away from the bottom wedge plate. Two external connection plates are symmetrically arranged with the center of the bottom wedge plate as the axis. A clamping pin shaft is slidably connected through the interior of both external connection plates. Springs are fixedly connected to the outer walls of the ends of both clamping pin shafts close to the external connection plates. A placement groove plate is fixedly connected to the top end of the side of the upper groove plate away from the bottom wedge plate. An external connection block is fixedly connected to the outer wall of the side of the upper groove plate away from the placement groove plate. A support block is fixedly connected to the inner wall of the clamping jaw.

[0013] Further, a plurality of the obstacle columns are longitudinally and evenly distributed. Equal-width gaps are arranged between adjacent obstacle columns. A concave groove is opened on the outer wall of the upper end of the bottom wedge plate. The upper groove plate is slidably connected inside the concave groove opened on the outer wall of the upper end of the bottom wedge plate.

[0014] Further, the initial positions of the two clamping pin shafts are clamped at the equal-width gaps arranged between adjacent obstacle columns. A concave surface is opened inside the placement groove plate. The internal diameter size of the placement groove plate is adapted to the diameter size of the workpiece.

[0015] Furthermore, the expansion and loosening mechanism includes a connection block that is slidably connected through the inner wall of the clamping jaw. On the outer wall of the side of the connection block away from the clamping jaw, a fixed plate is fixedly connected. At one end of the fixed plate away from the connection block, a telescopic cylinder is fixedly connected. One end of the telescopic cylinder close to the fixed plate is fixedly connected through a bottom block. On the outer wall of the side of the bottom block away from the telescopic cylinder, a crank is rotatably connected. There are two cranks symmetrically arranged with the center of the bottom block as the axis. At the inner walls of the ends of the two cranks away from the bottom block, connecting rods are rotatably connected. At the outer walls of the ends of the two connecting rods close to the cranks, rotating rods are rotatably connected. At the ends of the two rotating rods away from the connecting rods, long holding plates are fixedly connected. At the bottom end of the fixed plate, a fixed shaft is fixedly connected. There are two fixed shafts symmetrically arranged with the center of the fixed plate as the axis. At the bottom surfaces of the two ends of the long holding plate close to the fixed shaft, finger pressing plates are fixedly connected. On the outer wall of the side of the long holding plate close to the external block, an electric telescopic rod is fixedly connected through. On the outer wall of the side of the fixed plate close to the electric telescopic rod, a touch switch is fixedly connected.

[0016] Furthermore, at the bottom surfaces of the ends of the two connecting rods away from the cranks, they are rotatably connected to the bottom surface of the fixed plate, and the long holding plate is slidably connected through the outer walls of the two fixed shafts.

[0017] Furthermore, the initial position of the finger pressing plate is on the same horizontal plane as the placement groove plate, the initial position of the electric telescopic rod is on the same horizontal plane as the external block, and the initial position of the touch switch is in contact with the electric telescopic rod.

[0018] Furthermore, the intermittent impact mechanism includes a square plate fixedly connected to the upper surface of the clamping plate. At one end surface of the square plate away from the clamping plate, a support rod is fixedly connected. There are two support rods symmetrically arranged with the center of the square plate as the axis. At the bottom of the ends of the two support rods away from the square plate, an arc-shaped block is rotatably connected. At the top of the ends of the two support rods away from the square plate, a rotating wheel disc is rotatably connected. On the outer wall of the end of the arc-shaped block away from the support rod, a long shaft is fixedly connected. At the outer wall of the end of the long shaft away from the arc-shaped block, a hammering block is fixedly connected. On the outer wall of the side of the rotating wheel disc away from the support rod, a long rod is rotatably connected. At the outer wall of the end of the long rod away from the rotating wheel disc, a convex shaft disc is fixedly connected. On the outer wall of the end of the arc-shaped block away from the long shaft, a concave-convex block is fixedly connected.

[0019] Furthermore, the initial position of the hammering block is on the same horizontal plane as the upper groove plate, and the initial position of the convex shaft disc is in contact with the outer wall of the bottom end of the fixed shaft.

[0020] Furthermore, an arc-shaped protruding part is provided on the outer wall of the rotating wheel disc, and the initial position of the concave-convex block is in contact with the arc-shaped protruding part provided on the outer wall of the rotating wheel disc.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) The present invention utilizes the cooperation of the clamping pin shaft and the obstacle post. Through the design of the clamping pin shaft, rapid replacement of the welding fixture can be achieved, significantly shortening the time for replacing and debugging the welding fixture at the welding workstation. In addition, the design of the clamping pin shaft helps to achieve precise positioning of the welding fixture, reduce assembly errors, and improve welding accuracy. Moreover, precise positioning and clamping can limit deformation during the welding process, ensuring that the welded workpiece meets the shape and size requirements of the product drawing. Using a positioning and replacement mechanism with a clamping pin shaft can reduce auxiliary times such as scribing, alignment, and measurement, improve production efficiency, and optimize the layout of the production line by flexibly replacing the fixture, improving the utilization rate of equipment and the flexibility of the production line. Finally, the design of the clamping pin shaft helps to improve the repeat positioning accuracy of the fixture, ensuring the same positioning effect after each replacement. By reducing assembly errors and labor intensity, the service life of the fixture can be extended, and maintenance and replacement costs can be reduced;

[0023] (2) The present invention utilizes the cooperation of the finger pressure plate and the long connecting plate. The expansion and pressure relief mechanism can appropriately reduce the clamping force when the workpiece thermally expands, thereby alleviating thermal stress and reducing welding deformation. Moreover, through pressure relief, it can ensure that the workpiece maintains a relatively stable size during the welding process, avoiding size changes caused by thermal stress and improving the dimensional accuracy of the welded part. In addition, the expansion and pressure relief mechanism helps to keep the workpiece in a stable position during the welding process, making the formation of the weld more uniform and controllable, thus optimizing the weld quality and reducing welding defects. Moreover, reducing welding deformation means that the welded part can more accurately meet the design requirements, improving welding accuracy and consistency. The expansion and pressure relief mechanism can reduce the clamping force when the workpiece thermally expands, avoiding the generation of surface defects such as indentations or scratches and protecting the integrity of the workpiece surface. Finally, the expansion and pressure relief mechanism can reduce the wear phenomenon of the contact surface between the fixture and the workpiece, extending the service life of the fixture and the workpiece;

[0024] (3) The present invention utilizes the cooperation of the hammering block and the concave-convex block. The intermittent impact mechanism knocks on the surface of the workpiece after it thermally expands, enabling the weld to obtain a certain amount of expansion energy, thereby eliminating or reducing these residual stresses. In addition, through knocking, the stress can be redistributed inside the workpiece, reducing the local stress peak value and improving the stability of the overall structure. Knocking can also cause the weld metal to receive a certain amount of vibration and extrusion, contributing to the densification of the weld metal, reducing defects such as pores and slag in the weld, and improving the mechanical properties of the weld. At the same time, by knocking to eliminate welding residual stress, subsequent stress relief and straightening treatment processes can be reduced, improving production efficiency; BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the front view three-dimensional structure schematic diagram of the present invention;

[0026] Figure 2Schematic partial three-dimensional structure diagram of the positioning and replacement mechanism of the present invention;

[0027] Figure 3 Schematic three-dimensional structure diagram of the positional relationship between the bottom wedge plate and the upper groove plate of the present invention;

[0028] Figure 4 Schematic three-dimensional structure diagram of the positional relationship between the clamping pin shaft and the obstacle post of the present invention;

[0029] Figure 5 Schematic three-dimensional structure diagram of the positional relationship between the external connection block and the electric telescopic rod of the present invention;

[0030] Figure 6 Schematic three-dimensional structure diagram of the positional relationship between the finger pressure plate and the fixed shaft of the present invention;

[0031] Figure 7 Schematic three-dimensional structure diagram of the positional relationship between the finger pressure plate and the convex shaft disc of the present invention;

[0032] Figure 8 Schematic three-dimensional structure diagram of the positional relationship between the runner disc and the concave-convex block of the present invention.

[0033] The reference numerals in the figure are: 1, main body of the welding fixture; 11, clamping jaws; 12, clamping screws; 13, base; 14, clamping plate; 2, positioning and replacement mechanism; 21, bottom wedge plate; 22, obstacle post; 23, upper groove plate; 24, external connection plate; 25, clamping pin shaft; 26, spring; 27, placement groove plate; 28, external connection block; 29, support block; 3, expansion and relaxation mechanism; 31, connection block; 32, fixing plate; 33, telescopic cylinder; 34, bottom block; 35, crank; 36, connecting rod; 37, rotating rod; 38, long engagement 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-shaped block; 44, runner disc; 45, long shaft; 46, hammering block; 47, long rod; 48, convex shaft disc; 49, concave-convex block. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention;

[0035] Embodiments of the present invention

[0036] A quick replacement device for an anti-deformation welding fixture, refer to Figure 1As shown in the figure, it includes a welding fixture body 1 with a rectangular frame structure. Inside the upper end of the welding fixture body 1, there is a clamping jaw 11 that is slidably connected and used to clamp the contact part of the workpiece in the welding fixture body 1. On one side of the right end of the welding fixture body 1, there is a clamping screw 12 that is rotatably connected and used to rotate and adjust the clamping force. At the bottom end of the welding fixture body 1, there is a base 13 that is fixedly connected and used to connect with the machine tool workbench and provide a stable foundation. At the top end of one side of the welding fixture body 1 away from the base 13, there is a clamping plate 14 that is fixedly connected and used to fix the workpiece panel;

[0037] In view of the above-mentioned quick replacement device for an anti-deformation welding fixture, it can be specifically implemented as follows:

[0038] Inside the clamping jaw 11, there is a positioning and replacement mechanism 2. On the upper surface of the clamping plate 14, there is an expansion and pressure relief mechanism 3. On the outer ends of both sides of the clamping jaw 11, there is an intermittent impact mechanism 4;

[0039] Reference Figure 2 As shown in the figure, the positioning and replacement mechanism 2 is used to accurately position the workpiece at the welding position;

[0040] Reference Figure 3 As shown in the figure, the positioning and replacement mechanism 2 includes a bottom wedge plate 21 fixedly connected to the upper surface of the clamping plate 14. On the outer wall of the side of the bottom wedge plate 21 away from the clamping plate 14, there is an obstacle column 22. A plurality of obstacle columns 22 are symmetrically arranged with the center of the bottom wedge plate 21 as the axis. On the surface of the end of the bottom wedge plate 21 away from the clamping plate 14, there is an upper groove plate 23 that is slidably connected. On the outer wall of the side of the upper groove plate 23 away from the bottom wedge plate 21, there is an external connection plate 24. There are two external connection plates 24 that are symmetrically arranged with the center of the bottom wedge plate 21 as the axis. Inside both of the two external connection plates 24, there is a clamping pin shaft 25 that penetrates and is slidably connected. On the outer wall of the end of both of the two clamping pin shafts 25 close to the external connection plate 24, there is a spring 26 fixedly connected. At the top end of the side of the upper groove plate 23 away from the bottom wedge plate 21, there is a placement groove plate 27 fixedly connected. On the outer wall of the side of the upper groove plate 23 away from the placement groove plate 27, there is an external connection block 28. Inside the inner wall of the clamping jaw 11, there is a support block 29;

[0041] Reference Figure 3 As shown in the figure, a plurality of obstacle columns 22 are longitudinally and evenly distributed. There is an equal-width gap between adjacent obstacle columns 22. On the upper outer wall of the bottom wedge plate 21, there is a concave groove. The upper groove plate 23 is slidably connected inside the concave groove opened on the upper outer wall of the bottom wedge plate 21;

[0042] Reference Figure 4 As shown in the figure, the initial positions of the two clamping pin shafts 25 are clamped at the equal-width gaps between adjacent obstacle columns 22. Inside the placement groove plate 27, there is a concave surface. The internal diameter size of the placement groove plate 27 is adapted to the diameter size of the workpiece;

[0043] Summary 1: In the prior art, inaccurate positioning of workpieces is likely to cause welding deformation. Through the design of the clamping pin shaft 25, the present invention can achieve rapid replacement of welding jigs, significantly shortening the time for replacing and debugging welding jigs at the welding workstation. In addition, the design of the clamping pin shaft 25 helps to achieve precise positioning of the welding jig, reduce assembly errors, and improve welding accuracy. Moreover, precise positioning and clamping can limit deformation during the welding process, ensuring that the welded parts meet the shape and size requirements of the product drawings. Using the positioning and replacement mechanism 2 with the clamping pin shaft 25 can reduce auxiliary time such as scribing, alignment, and measurement, improve production efficiency, and optimize the layout of the production line by flexibly replacing jigs, improving the utilization rate of equipment and the flexibility of the production line. Finally, the design of the clamping pin shaft 25 helps to improve the repeated positioning accuracy of the jig, ensuring the same positioning effect after each replacement. By reducing assembly errors and labor intensity, the service life of the jig can be extended, and maintenance and replacement costs can be reduced.

[0044] Reference Figure 5 As shown, the expansion and pressure-relief mechanism 3 is used to appropriately reduce the clamping force when the workpiece thermally expands to avoid the generation of indentation marks;

[0045] Reference Figure 5 As shown, the expansion and pressure-relief mechanism 3 includes a connection block 31 that is slidably connected through the inner wall of the clamping jaw 11. On the outer wall of the side of the connection block 31 away from the clamping jaw 11, a fixing plate 32 is fixedly connected. At one end of the outer wall of the fixing plate 32 away from the connection block 31, a telescopic cylinder 33 is fixedly connected. At one end of the telescopic cylinder 33 close to the fixing plate 32, a bottom block 34 is fixedly connected through. On the outer wall of the side of the bottom block 34 away from the telescopic cylinder 33, a crank 35 is rotatably connected. There are two cranks 35 symmetrically arranged with the center of the bottom block 34 as the axis. At the inner walls of the ends of the two cranks 35 away from the bottom block 34, connecting rods 36 are rotatably connected. At the outer walls of the ends of the two connecting rods 36 close to the crank 35, rotating rods 37 are rotatably connected. At the ends of the two rotating rods 37 away from the connecting rods 36, long holding plates 38 are fixedly connected. At the bottom of the two ends of the long holding plate 38 close to the fixed shaft 39, finger pressing plates 310 are fixedly connected. At the outer wall of the side of the long holding plate 38 close to the external block 28, an electric telescopic rod 311 is fixedly connected through. At the outer wall of the side of the fixing plate 32 close to the electric telescopic rod 311, a touch switch 312 is fixedly connected;

[0046] Reference Figure 5 As shown, at the bottom surface of the fixing plate 32, the ends of the two connecting rods 36 away from the crank 35 are rotatably connected, and the long holding plate 38 is slidably connected through the outer walls of the two fixed shafts 39;

[0047] Reference Figure 6As shown, the initial position of the acupressure board 310 is at the same level as the placement groove board 27, the initial position of the electric telescopic rod 311 is at the same level as the external connection block 28, and the initial position of the touch switch 312 abuts against the electric telescopic rod 311;

[0048] Summary II: Compared with the prior art, when the workpiece expands due to heat and then contracts during the cooling process, thermal stress will be generated during this process. The expansion and relaxation mechanism 3 of the present invention can timely reduce the clamping force when the workpiece thermally expands, thereby alleviating the thermal stress, reducing welding deformation, and through relaxation, it can ensure that the workpiece maintains a relatively stable size during the welding process, avoiding size changes caused by thermal stress, improving the dimensional accuracy of the welded part. In addition, the expansion and relaxation mechanism 3 helps to keep the workpiece in a stable position during the welding process, making the formation of the weld more uniform and controllable, thereby optimizing the weld quality, reducing welding defects. Moreover, reducing welding deformation means that the welded part can more accurately meet the design requirements, improving the welding accuracy and consistency. And the expansion and relaxation mechanism 3 can reduce the clamping force when the workpiece thermally expands, avoiding the generation of surface defects such as indentations or scratches, protecting the integrity of the workpiece surface. Finally, the expansion and relaxation mechanism 3 can reduce the wear phenomenon of the contact surface between the fixture and the workpiece, extending the service life of the fixture and the workpiece.

[0049] Reference Figure 7 As shown, the intermittent impact mechanism 4 is used to strike the surface of the thermally expanded workpiece to cause minor plastic deformation of the workpiece;

[0050] Reference 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. One end surface of the square plate 41 away from the clamping plate 14 is fixedly connected with a support rod 42. There are two support rods 42 symmetrically arranged about the center axis of the square plate 41. The bottom ends of the two support rods 42 away from the square plate 41 are rotatably connected with an arc-shaped block 43. The top ends of the two support rods 42 away from the square plate 41 are rotatably connected with a runner disc 44. One end outer wall of the arc-shaped block 43 away from the support rod 42 is fixedly connected with a long shaft 45. One end outer wall of the long shaft 45 away from the arc-shaped block 43 is fixedly connected with a hammering block 46. One side outer wall of the runner disc 44 away from the support rod 42 is rotatably connected with a long rod 47. One end outer wall of the long rod 47 away from the runner disc 44 is fixedly connected with a convex shaft disc 48. One end outer wall of the arc-shaped block 43 away from the long shaft 45 is fixedly connected with a concave-convex block 49;

[0051] Reference Figure 7 As shown, the initial position of the hammering block 46 is at the same level as the upper groove plate 23, and the initial position of the convex shaft disc 48 abuts against the bottom outer wall of the fixed shaft 39;

[0052] Reference Figure 7As shown, an arc-shaped convex portion is provided on the outer wall of the runner disc 44, and the initial position of the concave-convex block 49 abuts against the arc-shaped convex portion provided on the outer wall of the runner disc 44;

[0053] Summary III: Comparing with the local heating and cooling of existing technology workpieces, welding residual stress will be generated. The intermittent impact mechanism 4 of the present invention knocks on the surface of the workpiece after its thermal expansion, which can enable the weld seam to obtain a certain amount of expansion energy, thereby eliminating or reducing these residual stresses. In addition, through knocking, the stress can be redistributed inside the workpiece, reducing the local stress peak value, improving the stability of the overall structure, and knocking can also cause the weld metal to obtain a certain amount of vibration and extrusion, which helps to densify the weld metal, reduce defects such as pores and slag in the weld seam, improve the mechanical properties of the weld seam. At the same time, by knocking to eliminate the welding residual stress, subsequent stress relief and straightening treatment processes can be reduced, improving production efficiency.

[0054] The complete working principle and steps of the above embodiments are as follows:

[0055] Initial limitation: As Figure 1 As shown, preparation work: First, the operator fixes the base 13 of the fixture on the welding fixture main body 1. The base 13 provides stable support for the entire fixture, ensuring that the fixture does not move during the welding process; Install the clamping plate 14: Subsequently, install the clamping plate 14 on the base 13. The clamping plate 14 is used to support and position the workpiece to be welded, and its surface usually has a special design for aligning and fixing the workpiece; Place the workpiece: Place the workpiece to be welded on the clamping plate 14. At this time, the workpiece needs to be accurately aligned to ensure the accuracy of welding; Adjust the clamping jaws 11: Use the clamping jaws 11 to adjust the position of the workpiece. The clamping jaws 11 are the most important part of the fixture. It ensures that the workpiece remains stable during the welding process and does not displace through adjustment and clamping; Clamp the workpiece: Rotate the clamping screw 12 to fasten the clamping jaws 11 on 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 the welding process; Welding operation: After the fixture fixes the workpiece, perform the welding operation. The design of the fixture ensures the stability of the workpiece, enabling the welding process to maintain precision and consistency; Inspection and adjustment: After welding is completed, check the quality of the welded part to ensure that there is no deformation or inconsistency. If problems are found, they can be corrected by adjusting the position or clamping force of the fixture; Unload the workpiece: After welding is completed, loosen the clamping screw 12, remove the clamping jaws 11, and then remove the workpiece from the clamping plate 14.

[0056] During use:

[0057] Steps of the positioning and replacement mechanism 2 for accurately positioning the workpiece at the welding position:

[0058] As 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 groove plate 23 is fixedly connected to the placing groove plate 27, the operator only needs to specifically place the workpiece to be welded inside the placing groove plate 27. Then, by moving the upper groove plate 23 in the concave groove 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 touches the surface of the workpiece to be welded, by pressing down the clamping pin shaft 25 that is slidably connected through the outer connecting plate 24, the end of the clamping pin shaft 25 away from the outer connecting plate 24 is completely locked in the gap provided between the adjacent obstacle posts 22, and the spring 26 fixedly connected to the outer wall of the clamping pin shaft 25 will be stretched downward. Thus, it can play a role in quickly installing and positioning the placement of the clamped workpiece to be welded. Similarly, when the workpiece to be welded is processed, only need to reset the clamping pin shaft 25 upward to disengage from the gap provided between the adjacent obstacle posts 22, and then move the upper groove plate 23 away from the clamping area of the clamping jaw 11. In this way, it also realizes the function of quickly unloading the placement of the clamped workpiece to be welded. In addition, when the upper groove plate 23 moves, it will drive the outer connecting block 28 fixedly connected to the outer wall of one side of the upper groove plate 23 to move synchronously;

[0059] Steps of the expansion and pressure relief mechanism 3 for timely reducing the clamping force to avoid the generation of indentation when the workpiece thermally expands:

[0060] As Figures 5 to 6 shown, when the upper groove plate 23 drives the outer connecting block 28 fixedly connected to the outer wall of one side of the upper groove plate 23 to move synchronously during the movement, the outer connecting block 28 touches the control switch at the bottom end of the electric telescopic rod 311. Then, the electric telescopic rod 311 moves upward and extends to touch the point touch switch 312. Thus, the point touch switch 312 drives the telescopic cylinder 33 to move downward and extend. Then, the bottom block 34 fixedly connected to one end of the telescopic cylinder 33 will move downward. In this way, the crank 35 rotatably connected to the outer wall of one side of the bottom block 34 will deflect oppositely to both sides. Therefore, the connecting rod 36 will deflect upward as the crank 35 deflects oppositely to the outside. At the same time, the deflection of the crank 35 to both sides will also push the rotating rod 37 rotatably connected to one end of the crank 35 to deflect in the same direction inward. So, the inward and same-direction deflection of the rotating rod 37 will cause the long contact plate 38 fixedly connected to one end of the rotating rod 37 to slide downward on the outer wall of the fixed shaft 39. Thus, the finger pressing plates 310 fixedly connected to both ends of the long contact plate 38 will move together as the long contact plate 38 slides downward to squeeze the surface of the workpiece to be welded placed inside the placing groove plate 27 to relieve the thermal stress and reduce the welding deformation;

[0061] Steps of the intermittent impact mechanism 4 for knocking the surface of the thermally expanded workpiece to cause slight plastic deformation of the workpiece:

[0062] As Figures 7 to 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;

[0063] 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 replacement device for an anti-deformation welding fixture, comprising a welding fixture main body (1) with a rectangular frame structure. A clamping jaw (11) for clamping the contacting part of the workpiece in the welding fixture main body (1) is slidably connected to the inner side of the upper end of the welding fixture main 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 main body (1). A base (13) for connecting with the machine tool workbench and providing a stable foundation is fixedly connected to the bottom end of the welding fixture main body (1). A clamping plate (14) for fixing the workpiece panel is fixedly connected to the top end of the side of the welding fixture main body (1) away from the base (13), characterized in that: A positioning and replacement mechanism (2) is arranged on the inner side of the clamping jaw (11), an expansion and pressure relief mechanism (3) is arranged on the upper surface of the clamping plate (14), and an intermittent impact mechanism (4) is arranged at 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 relief mechanism (3) is used to appropriately reduce the clamping force when the workpiece thermally expands to avoid the generation of indentation marks; The intermittent impact mechanism (4) is used to strike the surface of the thermally expanded workpiece to cause slight plastic deformation of the workpiece; The expansion and pressure relief mechanism (3) includes a connecting block (31) that is slidably connected through the inner wall of the clamping jaw (11). One side outer wall of the connecting block (31) far away from the clamping jaw (11) is fixedly connected with a fixing plate (32). One end outer wall of the fixing plate (32) far away from the connecting block (31) is fixedly connected with a telescopic cylinder (33). One end of the telescopic cylinder (33) close to the fixing plate (32) is fixedly connected through a bottom block (34). One side outer wall of the bottom block (34) far away from the telescopic cylinder (33) is rotatably connected with a crank (35). There are two cranks (35) symmetrically arranged with the center of the bottom block (34). One end inner walls of the two cranks (35) far away from the bottom block (34) are rotatably connected with connecting rods (36). One side outer walls of the two connecting rods (36) close to the cranks (35) are rotatably connected with rotating rods (37). One ends of the two rotating rods (37) far away from the connecting rods (36) are fixedly connected with long holding plates (38). The bottom end of the fixing plate (32) is fixedly connected with a fixed shaft (39). There are two fixed shafts (39) symmetrically arranged with the center of the fixing plate (32). The bottom surfaces of the two ends of the long holding plate (38) close to the fixed shaft (39) are fixedly connected with finger pressing plates (310). One side outer wall of the long holding plate (38) close to the external block (28) is fixedly connected through an electric telescopic rod (311). One side outer wall of the fixing plate (32) close to the electric telescopic rod (311) is fixedly connected with a touch switch (312).

2. The quick replacement device for an anti-deformation welding fixture according to claim 1, characterized in that: The positioning and replacement mechanism (2) includes a bottom wedge plate (21) fixedly connected to the upper surface of the clamping plate (14). One side outer wall of the bottom wedge plate (21) away from the clamping plate (14) is fixedly connected with an obstacle column (22). A plurality of the obstacle columns (22) are symmetrically arranged with respect to the center axis of the bottom wedge plate (21). One end surface of the bottom wedge plate (21) away from the clamping plate (14) is slidably connected with an upper groove plate (23). One side outer wall of the upper groove plate (23) away from the bottom wedge plate (21) is fixedly connected with an external connection plate (24). Two external connection plates (24) are symmetrically arranged with respect to the center axis of the bottom wedge plate (21). A clamping pin shaft (25) is slidably penetrated through the interior of each of the two external connection plates (24). One end outer wall of each of the two clamping pin shafts (25) close to the external connection plate (24) is fixedly connected with a spring (26). One side top end of the upper groove plate (23) away from the bottom wedge plate (21) is fixedly connected with a placement groove plate (27). One side outer wall of the upper groove plate (23) away from the placement groove plate (27) is fixedly connected with an external connection block (28). The inner wall of the clamping jaw (11) is fixedly connected with a support block (29).

3. The quick replacement device for an anti-deformation welding fixture according to claim 2, wherein: A plurality of the obstacle columns (22) are longitudinally and evenly distributed. An equal-width gap is provided between adjacent obstacle columns (22). A concave groove is formed in the upper end outer wall of the bottom wedge plate (21). The upper groove plate (23) is slidably connected to the concave groove formed in the upper end outer wall of the bottom wedge plate (21).

4. The quick replacement device for an anti-deformation welding fixture according to claim 2, characterized in that: The initial positions of the two clamping pin shafts (25) are clamped at the equal-width gaps provided between adjacent obstacle columns (22). A concave surface is formed in the interior of the placement groove plate (27). The inner diameter size of the placement groove plate (27) is adapted to the diameter size of the workpiece.

5. The quick replacement device for an anti-deformation welding fixture according to claim 1, characterized in that: One end of each of the two connecting rods (36) away from the crank (35) is rotatably connected to the bottom end surface of the fixed plate (32). The long connecting plate (38) is slidably penetrated through the outer walls of the two fixed shafts (39).

6. The quick replacement device for an anti-deformation welding fixture according to claim 5, characterized in that: The initial position of the finger pressing plate (310) is on the same horizontal plane as the placement groove plate (27). The initial position of the electric telescopic rod (311) is on the same horizontal plane as the external connection block (28). The initial position of the touch switch (312) abuts against the electric telescopic rod (311).

7. The quick replacement device for an anti-deformation welding fixture according to claim 6, characterized in that: The intermittent impact mechanism (4) includes a square plate (41) fixedly connected to the upper surface of the clamping plate (14). One end surface of the square plate (41) far from the clamping plate (14) is fixedly connected with a support rod (42). There are two support rods (42) symmetrically arranged about the center axis of the square plate (41). The bottom ends of the two support rods (42) far from the square plate (41) are rotatably connected with an arc-shaped block (43). The top ends of the two support rods (42) far from the square plate (41) are rotatably connected with a runner disc (44). One end outer wall of the arc-shaped block (43) far from the support rod (42) is fixedly connected with a long shaft (45). One end outer wall of the long shaft (45) far from the arc-shaped block (43) is fixedly connected with a hammering block (46). One side outer wall of the runner disc (44) far from the support rod (42) is rotatably connected with a long rod (47). One end outer wall of the long rod (47) far from the runner disc (44) is fixedly connected with a convex shaft disc (48). One end outer wall of the arc-shaped block (43) far from the long shaft (45) is fixedly connected with a concave-convex block (49).

8. The quick replacement device for an anti-deformation welding jig according to claim 7, characterized in that: The initial position of the hammering block (46) is at the same level as the upper groove plate (23), and the initial position of the convex shaft disc (48) abuts against the bottom end outer wall of the fixed shaft (39).

9. The quick replacement device for an anti-deformation welding fixture according to claim 8, characterized in that: The outer wall of the runner disc (44) is provided with an arc-shaped protruding part, and the initial position of the concave-convex block (49) abuts against the arc-shaped protruding part provided on the outer wall of the runner disc (44).

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