Welding fixture

Abstract

The welding fixture comprises a base and a pressing plate, a supporting frame protruding in the thickness direction of the base is arranged on the base, and the supporting frame is used for supporting a to-be-welded part; the pressing plate is arranged on the side, facing the supporting frame, of the base in the thickness direction and used for abutting against a to-be-welded part. Wherein the pressing plate is provided with a pressing spring mechanism, the pressing spring mechanism is provided with a pressing head protruding towards the base, the pressing head is used for abutting against a to-be-welded part, the pressing head comprises a top end abutting against the to-be-welded part, and the section of the top end is in an arc shape. The pressing spring mechanism with the arc-shaped pressing head is arranged on the pressing plate to abut against the to-be-welded parts, contact between the arc-shaped pressing head and the to-be-welded parts is linear contact, the pressing force can be improved, the two to-be-welded parts can generate a straight pressing fit section, and the clamping effect of the welding clamp is improved. And the condition that a gap is too large due to uneven contact of surface contact is reduced, so that the problem of insufficient soldering can be reduced, and the welding effect of the to-be-welded part is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding fixture. Background Technology

[0002] In the vehicle body manufacturing process, laser welding is often used in areas where welding torches are inconvenient to access.

[0003] During the welding process, the workpieces need to be positioned and clamped on a welding fixture before welding begins. Laser welding has advantages such as minimal heat-affected zone, minimal welding deformation, and high welding efficiency. However, because laser welding is very sensitive to lap gaps, the clamping of the welding fixture in related technologies is unstable, resulting in excessive gaps between the two workpieces to be welded. This leads to problems such as incomplete welds, leaks, and structural noises, indicating room for improvement. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a welding fixture that provides stable clamping, ensuring a consistent gap between two parts to be welded, thereby reducing the problem of incomplete welds.

[0005] According to an embodiment of the present invention, a welding fixture includes: a base, on which a support frame protruding along the thickness direction of the base is provided, the support frame being used to support a workpiece to be welded; a pressure plate, the pressure plate being disposed on one side of the base facing the support frame in the thickness direction, the pressure plate being used to abut against the workpiece to be welded; wherein, the pressure plate is provided with a compression spring mechanism, the compression spring mechanism having a pressure head protruding towards the base, the pressure head being used to abut against the workpiece to be welded, the pressure head including a top end that abuts against the workpiece to be welded, the top end having an arc-shaped cross-section.

[0006] According to embodiments of the present invention, the welding fixture, by providing a clamping spring mechanism with an arc-shaped pressure head on the pressure plate to stop the workpiece to be welded, forms a line contact between the arc-shaped pressure head and the workpiece to be welded, which can increase the clamping force and make the two workpieces to be welded form a straight clamping and fitting section, thereby improving the clamping effect of the welding fixture. It also reduces the possibility of uneven contact on the surface leading to excessive gaps, thereby reducing the problem of incomplete welds and improving the welding effect of the workpieces to be welded.

[0007] In some embodiments, the compression spring mechanism includes a support block, and the pressure head is fixedly connected to the support block. The pressure head includes a first pressure block and a second pressure block. The second pressure block is connected to the support block, and the wall thickness of the second pressure block is greater than the wall thickness of the first pressure block. The two ends of the first pressure block are a first end and a second end, respectively. The second end is connected to the second pressure block, and the first end is constructed as the top end. The wall thickness of the first pressure block at the second end is greater than the wall thickness at the first end.

[0008] In some embodiments, the first pressure block includes a transition section, one end of which defines the second end, and the other end of which extends toward the first end, the wall thickness of which gradually decreases along the direction from the second end to the first end.

[0009] In some embodiments, the first pressure block further includes a vertical segment connected to the other end of the transition section, the vertical segment defining the first end, the wall thickness of the vertical segment being consistent along the direction from the second end to the first end, and the extension direction of the vertical segment being perpendicular to the tangent direction of the top end and the abutment point of the workpiece to be welded.

[0010] In some embodiments, there are multiple compression spring mechanisms, which are spaced apart along a second direction; multiple compression spring mechanisms in the same row along the second direction form a group, and there are multiple groups of compression spring mechanisms, which are spaced apart along a first direction, which is perpendicular to the second direction; the pressure plate has through holes extending along the thickness direction of the pressure plate, and the through holes are located between two adjacent groups of compression spring mechanisms. There are multiple through holes located between two adjacent groups of compression spring mechanisms and they are spaced apart along the second direction. The through holes are opposite to the weld bead of the workpiece to be welded.

[0011] In some embodiments, there are two pressure heads, which are spaced apart along a first direction, and the tips of the two pressure heads extend along the first direction toward a direction away from each other.

[0012] In some embodiments, the compression spring mechanism further includes: a guide rod extending along the thickness direction of the pressure plate and passing through the pressure plate; a support block, the pressure head and the support block being fixedly connected by fasteners, the support block being connected to the end of the guide rod facing the base, and the support block being movable relative to the guide rod along the axial direction of the guide rod; a tightening nut, the tightening nut being threadedly engaged with the guide rod, and the tightening nut being disposed on the side of the pressure plate opposite to the base to prevent the guide rod from moving toward the base; and a spring, the spring being sleeved on the guide rod, with both ends of the spring abutting against the pressure plate and the support block respectively.

[0013] In some embodiments, the compression spring mechanism further includes a washer disposed between the support block and the pressure head.

[0014] In some embodiments, the welding fixture further includes a support, one end of which is fixedly connected to the base, and the other end of which is rotatably connected to the pressure plate so that the pressure plate can rotate relative to the base; the welding fixture further includes a driving mechanism for driving the pressure plate to rotate relative to the base, the driving mechanism including a first bracket, a second bracket, and a lifting cylinder, the first bracket being fixedly connected to the base, the second bracket being fixedly connected to the pressure plate, the lifting cylinder being connected between the first bracket and the second bracket, the lifting cylinder being hinged to the first bracket, and the lifting cylinder being hinged to the second bracket.

[0015] In some embodiments, the base is provided with a positioning pin, which limits the position of the workpiece to be welded; and / or, the base is provided with a locking mechanism, which is optionally connected to the pressure plate; and / or, the base is provided with a sensing mechanism, which is signal-connected to the drive mechanism, and the sensing mechanism is used to detect the workpiece to be welded and the pressure plate.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a welding fixture according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the front seat rear crossbeam of the welding fixture according to an embodiment of the present invention; Figure 3 This is another structural schematic diagram of a compression spring mechanism according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the pressure head and support block of a compression spring mechanism according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the pressure plate and compression spring mechanism according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a welding fixture in the open state according to an embodiment of the present invention; Figure 7 This is a cross-sectional view of a compression spring mechanism and a pressure plate according to an embodiment of the present invention; Figure 8This is another structural schematic diagram of a compression spring mechanism according to an embodiment of the present invention. Figure 9 This is a structural schematic diagram of a welding fixture according to an embodiment of the present invention, which supports the rear crossbeam of the front seat and the front floor body. Figure 10 This is a schematic diagram of a welding fixture in a clamped state according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the workpiece to be welded according to an embodiment of the present invention.

[0018] Figure label: Welding fixture 100: First direction X; Second direction Y; Base 1; Support frame 11; First support frame 111; Second support frame 112; Positioning pin 12; First positioning pin 121; Second positioning pin 122; Locking mechanism 13; Sensing mechanism 14; Second sensor 141; Third sensor 142; Pressure plate 2; Through hole 21; Compression spring mechanism 3; pressure head 31; top end 31a; first pressure block 311; first end 311a; second end 311b; transition section 3111; vertical section 3112; second pressure block 312; support block 32; guide rod 33; tightening nut 34; spring 35; fixed seat 36; washer 37; Support 4; Drive mechanism 5; First bracket 51; Second bracket 52; Lifting cylinder 53; Component to be welded 200; front seat rear crossbeam sub-assembly 200a; front floor body assembly 200b; weld bead 201. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0021] The welding fixture 100 of the present invention is described below with reference to the accompanying drawings.

[0022] The welding fixture 100 according to an embodiment of the present invention, such as Figures 1-3 As shown, the welding fixture 100 includes: a base 1 and a pressure plate 2. The base 1 is provided with a support frame 11 protruding along the thickness direction of the base 1, and the support frame 11 is used to support the workpiece 200 to be welded. The pressure plate 2 is provided on one side of the base 1 facing the support frame 11 in the thickness direction, and the pressure plate 2 is used to stop the workpiece 200 to be welded. The pressure plate 2 is provided with a compression spring mechanism 3, and the compression spring mechanism 3 has a pressure head 31 protruding towards the base 1. The pressure head 31 is used to stop the workpiece 200 to be welded. The pressure head 31 includes a top end 31a that stops the workpiece 200 to be welded, and the cross-sectional shape of the top end 31a is arc-shaped.

[0023] The welding fixture 100 includes a base 1 and a pressure plate 2. A protruding support frame 11 is provided on the base 1 to support the workpiece 200 to be welded. The pressure plate 2 applies pressure to the base 1 from one side of the support frame 11 and abuts against the workpiece 200. The base 1 and the pressure plate 2 together clamp the workpiece 200 to be welded, so that the two workpieces 200 are tightly fitted together. Then, laser welding is used to rapidly melt one of the workpieces 200, thereby welding the two workpieces 200 together.

[0024] Laser welding has advantages such as minimal heat-affected zone, minimal welding deformation, and high welding efficiency. However, because laser welding is highly sensitive to lap gaps, the clamping of welding fixtures in related technologies is unstable, resulting in excessive gaps between the two parts to be welded. This leads to problems such as incomplete welds, leaks, and structural noises, indicating room for improvement.

[0025] Therefore, in this embodiment of the invention, the pressure plate 2 uses a compression spring mechanism 3 to abut against the workpiece 200 to be welded. The compression spring mechanism 3 is disposed on the pressure plate 2 and applies pressure towards the base 1 to press the two workpieces 200 to be welded together. The top end 31a of the pressure head 31 of the compression spring mechanism 3 abuts against the workpiece 200 to be welded. The cross-sectional shape of the top end 31a is arc-shaped, and the contact between the arc-shaped pressure head 31 and the workpiece 200 to be welded is a line contact. Compared with the rectangular pressure head 31 forming a surface contact with the workpiece 200 to be welded, the line contact abuts against the workpiece, which can increase the clamping force and make the two workpieces 200 to be welded produce a straight pressing and fitting section, thereby making the gap between the two workpieces 200 to be welded consistent, reducing the situation where uneven contact of the surface contact leads to excessive gaps, thereby reducing the problem of incomplete welding and improving the welding effect of the workpieces 200 to be welded.

[0026] According to an embodiment of the present invention, the welding fixture 100, by providing a clamping spring mechanism 3 with an arc-shaped pressure head 31 on the pressure plate 2 to stop the workpiece 200 to be welded, forms a line contact between the arc-shaped pressure head 31 and the workpiece 200 to be welded, which can increase the clamping force and make the two workpieces 200 to be welded form a straight clamping and fitting section, thereby improving the clamping effect of the welding fixture 100. It also reduces the situation where uneven contact on the surface leads to excessive gaps, thereby reducing the problem of incomplete welding and improving the welding effect of the workpieces 200 to be welded.

[0027] In some embodiments of the present invention, there are at least two support frames 11 to support two parts 200 to be welded, respectively.

[0028] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the compression spring mechanism 3 includes a support block 32, and a pressure head 31 is fixedly connected to the support block 32. The pressure head 31 includes a first pressure block 311 and a second pressure block 312. The second pressure block 312 is connected to the support block 32, and the wall thickness of the second pressure block 312 is greater than the wall thickness of the first pressure block 311.

[0029] The support block 32 is fixedly connected to the pressure head 31. The support block 32 can support the pressure head 31. The end of the pressure head 31 away from the support block 32 is formed as the top end 31a.

[0030] The pressure head 31 includes a first pressure block 311 and a second pressure block 312. The second pressure block 312 is fixedly connected to the support block 32. The end of the first pressure block 311 furthest from the first pressure block 311 is formed as a tip 31a. Since the tip 31a is used to stop and form line contact with the workpiece 200 to be welded, the wall thickness of the tip 31a does not need to be too large. Therefore, in this embodiment of the invention, the pressure block is divided into a first pressure block 311 and a second pressure block 312. The wall thickness of the second pressure block 312 is greater than the wall thickness of the first pressure block 311, which can improve the connection stability between the pressure head 31 and the support block 32, thereby improving the structural stability of the pressure head 31; and it can also reduce the manufacturing amount of the first pressure block 311, saving manufacturing costs.

[0031] like Figure 3 and Figure 4 As shown, the two ends of the first pressing block 311 are the first end 311a and the second end 311b, respectively. The second end 311b is connected to the second pressing block 312. The first end 311a is constructed as the top end 31a. The wall thickness of the first pressing block 311 at the second end 311b is greater than the wall thickness at the first end 311a.

[0032] Similarly, the first end 311a is used to stop and form line contact with the workpiece 200 to be welded. Therefore, the wall thickness of the first end 311a does not need to be set too large. Designing the first pressure block 311 so that the wall thickness at the second end 311b is greater than the wall thickness at the first end 311a can improve the structural stability of the first pressure block 311 and reduce the manufacturing amount of the first pressure block 311, thus saving manufacturing costs.

[0033] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the first pressing block 311 includes a transition section 3111, one end of which defines a second end 311b, and the other end of the transition section 3111 extends toward the first end 311a. The wall thickness of the transition section 3111 gradually decreases along the direction from the second end 311b to the first end 311a.

[0034] The wall thickness of the transition section 3111 gradually decreases along the direction from the second end 311b to the first end 311a, which can reduce the stress concentration point of the first pressure block 311 and reduce the risk of fracture of the first pressure block 311.

[0035] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the first pressing block 311 also includes a vertical section 3112 connected to the other end of the transition section 3111. The vertical section 3112 defines the first end 311a. The wall thickness of the vertical section 3112 is consistent along the direction from the second end 311b to the first end 311a. The extension direction of the vertical section 3112 is perpendicular to the tangent direction of the top end 31a and the contact point of the workpiece 200 to be welded.

[0036] The first pressure block 311 also includes a vertical section 3112. The wall thickness of the vertical section 3112 remains consistent from the second end 311b to the first end 311a. The end of the vertical section 3112 is the top end 31a of the pressure head 31. The pressure head 31 is used to stop the workpiece 200 to be welded. The pressure head 31 applies pressure to the workpiece 200, and therefore also receives pressure and the reaction force from the workpiece 200. By setting the vertical section 3112, the wall thickness of the vertical section 3112 remains consistent, and the extension direction of the vertical section 3112 is straight. The tangent direction at the contact point between the top end 31a and the workpiece 200 is perpendicular to the extension direction of the vertical section 3112. In this way, the extension direction of the vertical section 3112 is on the same straight line as the force direction, which can reduce the occurrence of bending of the first pressure block 311 under force or the displacement of the contact point between the top end 31a and the workpiece 200, and improve the working reliability of the pressure head 31.

[0037] The first pressure block 311 includes a transition section 3111, the wall thickness of which gradually decreases along the direction from the second end 311b to the first end 311a. Therefore, the extension direction of the transition section 3111 forms an angle with the direction of pressure application. By providing a vertical section 3112, and aligning the extension direction of the vertical section 3112 with the direction of force application, the occurrence of bending of the pressure block under force or displacement of the contact point between the top end 31a and the weldment 200 can be reduced.

[0038] In some embodiments of the present invention, such as Figure 5 and Figure 6 As shown, there are multiple compression spring mechanisms 3, which are spaced apart along the second direction Y; multiple compression spring mechanisms 3 located in the same row along the second direction Y form a group, and there are multiple groups of compression spring mechanisms 3, which are spaced apart along the first direction X, and the first direction X is perpendicular to the second direction Y.

[0039] like Figure 6 and Figure 11 As shown, the pressure plate 2 has a through hole 21 extending along the thickness direction of the pressure plate 2. The through hole 21 is located between two adjacent sets of compression spring mechanisms 3. There are multiple through holes 21 located between the same two adjacent sets of compression spring mechanisms 3 and they are spaced apart along the second direction Y. The through hole 21 is opposite to the weld bead 201 of the workpiece 200 to be welded.

[0040] Multiple compression spring mechanisms 3 are spaced apart along the second direction Y. The top end 31a of each compression spring mechanism 3 abuts against the workpiece 200 to be welded and forms line contact with the workpiece 200. In this way, a compression line extending along the second direction Y is formed by pressing the workpiece 200. Through holes 21 are provided on the pressure plate 2 near the compression spring mechanism 3. The through holes 21 are spaced apart along the second direction Y and are opposite to the weld bead 201 of the workpiece 200. Both sides of the weld bead 201 are pressed by the compression spring mechanism 3.

[0041] Lasers are emitted sequentially into multiple through holes 21. The lasers then pass through weld beads 201 and enter the clamping point of two parts 200 to be welded, thus welding the two parts 200 together. The two parts 200 are then connected together by multiple welds spaced along the second direction Y.

[0042] Multiple compression spring mechanisms 3 located in the same row along the second direction Y form a group. By setting multiple groups of compression spring mechanisms 3 spaced apart along the first direction X, multiple points of the workpieces 200 to be welded can be compressed, forming multiple compression lines spaced apart along the first direction X and extending along the second direction Y. Multiple through holes 21 are also present, with one group of through holes 21 positioned between two adjacent groups of compression spring mechanisms 3, thereby allowing two workpieces 200 to be welded to be connected by multiple welding lines spaced apart along the first direction X.

[0043] In some embodiments of the present invention, such as Figure 4 and Figure 5 As shown, there are two pressure heads 31, which are spaced apart along the first direction X, and the top ends 31a of the two pressure heads 31 extend away from each other along the first direction X.

[0044] By setting two pressure heads 31 extending in directions away from each other, the distance between the ends of the two pressure heads 31 can be increased, which is suitable for use on workpieces 200 with large spacing between weld beads 201, and can increase the coverage of the pressure heads 31 on the workpieces 200 to be welded.

[0045] In other embodiments of the invention, such as Figure 7 As shown, there is one pressure head 31, which is suitable for use when the volume of the workpiece 200 to be welded is small, or when the spacing between the weld beads 201 is small. In this way, the clamping strength of the workpiece 200 to be welded can be strengthened, and interference between adjacent clamping spring mechanisms 3 can be avoided.

[0046] In some embodiments of the present invention, such as Figure 3 and Figure 7 As shown, the compression spring mechanism 3 further includes: a guide rod 33, a support block 32, a tightening nut 34, and a spring 35. The guide rod 33 extends along the thickness direction of the pressure plate 2 and passes through the pressure plate 2. The pressure head 31 is fixedly connected to the support block 32 by fasteners. The support block 32 is connected to the end of the guide rod 33 facing the base 1, and the support block 32 can move relative to the guide rod 33 along the axial direction of the guide rod 33. The tightening nut 34 is threadedly engaged with the guide rod 33, and the tightening nut 34 is located on the side of the pressure plate 2 away from the base 1 to prevent the guide rod 33 from moving in the direction away from the base 1. The spring 35 is sleeved on the guide rod 33, and the two ends of the spring 35 abut against the pressure plate 2 and the support block 32, respectively.

[0047] The guide rod 33 is a connector. The guide rod 33 is connected to the pressure plate 2 and passes through the pressure plate 2. The guide rod 33 is used to support the support block 32, the tightening nut 34 and the spring 35. The support block 32, the tightening nut 34 and the spring 35 are all installed on the guide rod 33.

[0048] The support block 32 is connected to the end of the guide rod 33 facing the base 1, and is located on the side of the pressure plate 2 facing the bottom plate. The support block 32 supports the pressure head 31, and the pressure head 31 and the support block 32 are fixedly connected by fasteners, which can improve the structural stability of the pressure head 31. The support block 32 can move relative to the guide rod 33 along the axial direction of the guide rod 33, and the guide rod 33 can limit the movement of the support block 32 in the direction facing the bottom plate.

[0049] Spring 35 is sleeved on guide rod 33. The two ends of spring 35 abut against pressure plate 2 and support block 32 respectively. Spring 35 applies elastic force to support block 32, thereby pressing pressure head 31 stably onto the workpiece 200 to be welded.

[0050] The tightening nut 34 is threadedly engaged with the guide rod 33, and the tightening nut 34 is located on the side of the pressure plate 2 away from the base 1. The tightening nut 34 abuts against the pressure plate 2, preventing the guide rod 33 from moving towards the base 1. The spring 35 applies a spring force to the support block 32, causing it to move towards the base 1. The guide rod 33 can limit the movement of the support block 32 towards the base plate. Thus, the spring force is applied to the guide rod 33, causing it to move towards the base 1. Under the combined action of the tightening nut 34 and the spring 35, the guide rod 33 is stably connected to the pressure plate 2.

[0051] Furthermore, when the nut 34 is tightened by rotation, the guide rod 33 moves away from the base 1 under the action of the threaded engagement, which shortens the distance between the pressure plate 2 and the support block 32, thereby increasing the elastic force of the spring 35 on the support block 32. Thus, the distance between the pressure plate 2 and the support block 32 can be adjusted according to the thickness of the workpiece 200 to be welded, ensuring that the pressure head 31 can stably press the workpiece 200 of different thicknesses.

[0052] In some embodiments of the present invention, such as Figure 3 and Figure 7 As shown, the compression spring mechanism 3 also includes a fixing seat 36 sleeved on the guide rod 33. The fixing seat 36 is located on the side of the pressure plate 2 facing the base 1, and the fixing seat 36 is fixedly connected to the pressure plate 2. By setting the fixing seat 36, the connection stability between the guide rod 33 and the pressure plate 2 can be improved, the limiting of the guide rod 33 can be improved, and the shaking of the guide rod 33 can be reduced. Furthermore, both ends of the spring 35 can be abutted between the fixing seat 36 and the support block 32. By setting the fixing seat 36, the deformation stability of the spring 35 can be improved, and the deviation of the elastic angle caused by the bending of the spring 35 can be reduced.

[0053] In some embodiments of the present invention, such as Figure 7 As shown, the compression spring mechanism 3 also includes a washer 37, which is disposed between the support block 32 and the pressure head 31.

[0054] By setting a shim 37 between the support block 32 and the pressure head 31, the distance between the support block 32 and the pressure head 31 can be adjusted to adjust the clamping force of the pressure head 31 on the workpiece 200 to be welded. Furthermore, the thickness or number of the shims 37 can be adjusted according to the thickness of the workpiece 200 to be welded, so that the pressure head 31 can stably clamp the workpiece 200 to be welded with different thicknesses.

[0055] In some embodiments of the present invention, a single pressure head 31 can achieve a clamping force of 300N.

[0056] In some embodiments of the present invention, such as Figure 2 and Figure 6 As shown, the welding fixture 100 also includes a support 4, one end of which is fixedly connected to the base 1, and the other end of which is rotatably connected to the pressure plate 2, so that the pressure plate 2 can rotate relative to the base 1. The welding fixture 100 also includes a drive mechanism 5, which is used to drive the pressure plate 2 to rotate relative to the base 1. The drive mechanism 5 includes a first bracket 51, a second bracket 52, and a lifting cylinder 53. The first bracket 51 is fixedly connected to the base 1, the second bracket 52 is fixedly connected to the pressure plate 2, and the lifting cylinder 53 is connected between the first bracket 51 and the second bracket 52. The lifting cylinder 53 is hinged to the first bracket 51 and the second bracket 52.

[0057] The pressure plate 2 is rotatably connected to the base 1 via the support 4, and the welding fixture 100 has a clamped state and an open state. In the clamped state, the lifting cylinder 53 mechanism retracts, and the pressure plate 2 abuts against the top end 31a of the workpiece 200 to be welded. In the open state, the lifting cylinder 53 mechanism extends, and the pressure plate 2 separates from the workpiece 200 to be welded.

[0058] By incorporating a lifting cylinder 53, the welding fixture 100 can automatically clamp the workpiece 200 to be welded, thereby improving welding efficiency and facilitating automated production. Furthermore, the lifting cylinder 53 provides sufficient driving force to stably clamp the pressure plate 2 onto the workpiece 200.

[0059] The drive mechanism 5 includes a first bracket 51, a second bracket 52, and a lifting cylinder 53. The lifting cylinder 53 is hinged to the first bracket 51 and to the second bracket 52. During the extension or retraction of the lifting cylinder 53, relative rotation can occur between the lifting cylinder 53 and both the first and second brackets 51 and 52. This increases the stroke of the pressure plate 2, expands its range of motion, reduces interference between the pressure plate 2 and the workpiece 200 to be welded during its movement, and facilitates the placement of the workpiece 200 on the base 1.

[0060] In some embodiments of the present invention, such as Figure 6 As shown, there are two drive mechanisms 5, which are located on both sides of the base 1. They are lifting cylinders 53 with a cylinder diameter of 200mm, with a driving force of about 30,000N and a clamping force of 20,000N, which can meet the clamping force requirements of multiple weld seams.

[0061] In some embodiments of the present invention, such as Figure 2 , Figure 8 and Figure 9As shown, a positioning pin 12 is provided on the base 1, which limits the position of the workpiece 200 to be welded. By setting the positioning pin 12, the workpiece 200 to be welded placed on the base 1 can be positioned, reducing the possibility of the workpiece 200 being dislodged and improving the working reliability of the welding fixture 100.

[0062] In some embodiments of the present invention, there are at least two locating pins 12 to position the two parts 200 to be welded, respectively.

[0063] In some embodiments of the present invention, such as Figure 8 and Figure 10 As shown, a locking mechanism 13 is provided on the base 1, and the locking mechanism 13 can be selectively connected to the pressure plate 2. The locking mechanism 13 can lock the welding fixture 100 in a clamped state, which can reduce the dislocation of the pressure plate 2 caused by the failure of the drive mechanism 5 and improve the working reliability of the welding fixture 100.

[0064] In some embodiments of the present invention, such as Figures 8-10 As shown, a sensing mechanism 14 is provided on the base 1. The sensing mechanism 14 is connected to the drive mechanism 5 by a signal. The sensing mechanism 14 is used to detect the workpiece 200 to be welded and the pressure plate 2.

[0065] After sensing that the workpiece 200 to be welded is in place, the sensing mechanism 14 sends a signal to the drive mechanism 5 indicating that it is ready to work, and then drives the pressure plate 2 to press down on the workpiece 200, which can improve the working reliability of the welding fixture 100. Furthermore, after sensing that the pressure plate 2 is in place, the sensing mechanism 14 provides a safety signal indicating that welding can proceed, thereby improving the reliability of the welding operation.

[0066] The following describes the use of a welding fixture 100 according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0067] First, such as Figure 6 As shown, the welding fixture 100 is in the open state for component loading. Figure 2 As shown, the front seat rear crossbeam sub-assembly 200a is installed into the first locating pin 121 manually or by a robot, and the front seat rear crossbeam sub-assembly 200a and the first support frame 111 are basically in contact. Figure 9 As shown, the front floor body assembly 200b is inserted into the second positioning pin 122 by manual labor or robot. The front floor body assembly 200b is basically in contact with the second support frame 112 and the front seat rear crossbeam sub-assembly 200a.

[0068] Next, as Figure 8As shown, the welding fixture 100 presses the front floor assembly 200b and the front seat rear crossbeam sub-assembly 200a together. The electronically controlled induction lights on the second sensor 141 and the second support frame 112 illuminate, sending a logic signal to trigger the lifting cylinder 53. The lifting cylinder 53 drives the pressure plate 2 to rotate, causing the compression spring 35 structure to press the front floor assembly 200b and the front seat rear crossbeam sub-assembly 200a together. The pressure plate 2 contacts the third sensor 142, and the compression spring mechanism 3 contacts the front floor panel assembly and the first support frame 111 to form a pressure against each other. The surface of the pressure plate 2 also forms a pressure against the second support frame 112. Figure 10 As shown, the welding fixture 100 is clamped and locked, and the locking mechanism 13 locks the welding fixture 100 in the clamped state.

[0069] Then, as Figure 1 As shown, laser welding is performed by a robot that drives the laser head to perform the welding.

[0070] Finally, after welding is completed, pressure plate 2 and base 1 are unlocked, and lifting cylinder 53 pushes pressure plate 2 to open, causing welding fixture 100 to switch to the open state. The welded front floor body assembly 200b and front seat rear crossbeam sub-assembly 200a are then removed manually or by a robot, completing one work cycle. This cycle is repeated.

[0071] Other components of the welding fixture according to embodiments of the present invention, such as lifting cylinders and laser welding operations, are known to those skilled in the art and will not be described in detail here.

[0072] In the description of this invention, it should be understood that the terms "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A welding fixture, characterized by, The utility model relates to a welding device for welding workpiece, comprising: a base, a support frame is arranged on the base and protrudes along the thickness direction of the base, the support frame is used for supporting the workpiece to be welded; a pressing plate is arranged on the side of the base facing the support frame in the thickness direction of the base, and the pressing plate is used for abutting against the workpiece to be welded; wherein the pressing plate is provided with a pressing spring mechanism, the pressing spring mechanism has a pressing head protruding towards the base, the pressing head is used for abutting against the workpiece to be welded, and the pressing head comprises a top end abutting against the workpiece to be welded, and the top end has an arc-shaped cross section.

2. The welding fixture of claim 1, wherein, The pressing spring mechanism comprises a support block, the pressing head is fixedly connected with the support block, the pressing head comprises a first pressing block and a second pressing block, the second pressing block is connected with the support block, and the wall thickness of the second pressing block is greater than that of the first pressing block; the first pressing block has a first end and a second end at two ends thereof, the second end is connected with the second pressing block, the first end is configured as the top end, and the wall thickness of the first pressing block at the second end is greater than that at the first end.

3. The welding fixture of claim 2, wherein, The first pressing block comprises a transition section, one end of the transition section defines the second end, the other end of the transition section extends towards the first end, and the wall thickness of the transition section gradually decreases along the direction from the second end to the first end.

4. The welding fixture of claim 3, wherein, The first pressing block further comprises a vertical section connected at the other end of the transition section, the vertical section defines the first end, the wall thickness of the vertical section remains consistent along the direction from the second end to the first end, and the extension direction of the vertical section is perpendicular to the tangent direction of the abutting point of the top end and the workpiece to be welded.

5. The welding fixture of claim 1, wherein, The pressing spring mechanism is multiple, multiple pressing spring mechanisms are arranged at intervals along a second direction; multiple pressing spring mechanisms in the same row in the second direction form a group, the pressing spring mechanisms are multiple groups, and multiple groups of the pressing spring mechanisms are arranged at intervals along a first direction, wherein the first direction is perpendicular to the second direction; a through hole is formed in the pressing plate and penetrates through the thickness direction of the pressing plate, the through hole is arranged between adjacent two groups of the pressing spring mechanisms, multiple through holes are arranged at intervals along the second direction between the same adjacent two groups of the pressing spring mechanisms, and the through hole is opposite to the welding bead of the workpiece to be welded.

6. The welding fixture of claim 5, wherein, The pressing head is two, and the two pressing heads are arranged at intervals along the first direction, and the top ends of the two pressing heads extend in directions away from each other along the first direction.

7. The welding fixture of claim 1, wherein, The pressing spring mechanism further comprises: a guide rod extending along the thickness direction of the pressing plate and penetrating through the pressing plate; a support block, the pressing head is fixedly connected with the support block through a fastener, the support block is connected at one end of the guide rod facing the base, and the support block can move along the axial direction of the guide rod relative to the guide rod; a tightening nut threadedly matched with the guide rod, and the tightening nut is arranged on the side of the pressing plate away from the base to prevent the guide rod from moving towards the base. A spring is sleeved on the guide rod, and two ends of the spring are respectively abutted between the pressing plate and the support block.

8. The welding fixture of claim 7, wherein, The pressing spring mechanism further comprises a gasket arranged between the support block and the pressing head.

9. The welding fixture of any one of claims 1-8, wherein, The welding fixture further comprises a support, one end of the support is fixedly connected with the base, and the other end of the support is rotatably connected with the pressing plate, so that the pressing plate can rotate relative to the base. The welding fixture further comprises a driving mechanism for driving the pressing plate to rotate relative to the base, the driving mechanism comprises a first support, a second support and a lifting cylinder, the first support is fixedly connected with the base, the second support is fixedly connected with the pressing plate, and the lifting cylinder is connected between the first support and the second support, the lifting cylinder is hinged to the first support, and the lifting cylinder is hinged to the second support.

10. The welding fixture of claim 9, wherein, A positioning pin is arranged on the base, and the positioning pin limits the to-be-welded piece. And / or, a locking mechanism is arranged on the base, and the locking mechanism is selectively connected with the pressing plate. And / or, a sensing mechanism is arranged on the base, the sensing mechanism is signal-connected with the driving mechanism, and the sensing mechanism is used for detecting the to-be-welded piece and the pressing plate.

Images