A projection welding head and welding apparatus

Abstract

The utility model provides a kind of projection welding head and welding equipment, projection welding head and including welding head seat, electrode anvil, elastic telescopic mechanism, locking mechanism and push-up mechanism, a plurality of electrode anvil is slidably connected on the welding head seat;Elastic telescopic mechanism is set between the electrode anvil and the welding head seat one by one, so that the electrode anvil elastically telescopes along the axial direction of the welding head seat;Locking mechanism is installed on the welding head seat, and has movable locking end.The utility model provides each electrode anvil independent elastic telescoping by elastic telescopic mechanism, actively adheres workpiece, forms elastic self-adapting, compensates the height difference of uneven workpiece surface, then the anvil group that has been adhered is rigidly locked as a whole by locking mechanism, then the overall pressure is applied by push-up mechanism, so that electrode anvil and workpiece are fully contacted and then the overall pressure is applied, and relative balanced multi-point welding pressure, effectively improve the consistency of welding quality.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment technology, specifically to a protrusion welding head and welding equipment. Background Technology

[0002] Projection welding is a highly efficient welding method capable of simultaneous multi-point welding, and can be used to replace arc welding, brazing, and interlocking. Projection points are pre-machined onto the sheet metal, or features on the workpiece that concentrate current, such as chamfers, are used as the contact points during welding. For example, Chinese Patent 202122702322.9 discloses a projection welding electrode support, including an electrode wheel and an arc-shaped body; the electrode wheel includes a wheel body, with a first electrode, a second electrode, a third electrode, and a fourth electrode threadedly connected to its four sides.

[0003] The existing technology has the following problems: the rigid welding head itself hardly deforms, and if the workpiece surface is uneven or there are slight differences in the height of multiple protrusions, the rigid welding head may have poor contact or excessive pressure, resulting in poor welding quality. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a raised spot welding head to solve the technical problems of poor contact or excessive pressure in the prior art when multiple points are welded on uneven workpiece surfaces.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a bump welding head, comprising: Welding head holder; Electrode pressure heads, a plurality of said electrode pressure heads being slidably connected to the welding head seat; An elastic telescopic mechanism is provided between the electrode pressure head and the welding head seat in a one-to-one correspondence, so that the electrode pressure head can elastically telescopic along the axial direction of the welding head seat; A locking mechanism, mounted on the welding head holder, has a movable locking end, allowing the electrode pressure head to have both a locked state and a sliding state; and The upward pushing mechanism has its movable end connected to the welding head seat, driving the welding head seat to push upward and apply pressure.

[0006] In some embodiments, the welding head holder includes a bottom shell and a central column. The central column is connected to the inner side of the bottom shell by a support rod, and the outer side of the central column is provided with guide grooves that correspond one-to-one with the electrode pressure heads.

[0007] In some embodiments, the elastic telescopic mechanism includes a sleeve and a spring, the spring being built inside the sleeve and abutting against the electrode pressure head.

[0008] In some embodiments, a guide groove is provided at the bottom of the electrode indenter, the sleeve is inserted into and slidably connected to the guide groove, and the top end of the spring abuts against the inner top wall of the guide groove.

[0009] In some embodiments, the electrode indenter has a limiting flange on the side near the central column to limit its upward extreme position.

[0010] In some embodiments, the locking mechanism includes a telescopic mechanism, a base frame, a push block, and a horizontal clamping block. The telescopic mechanism is installed inside the welding head seat. The base frame is connected to the telescopic end of the telescopic mechanism. The push block is connected to the base frame in a one-to-one correspondence with the electrode pressure head. The horizontal clamping block is slidably connected to the welding head seat in a one-to-one correspondence with the push block and slides radially along the welding head seat to abut against the electrode pressure head to lock the electrode pressure head. The side of the horizontal clamping block opposite to the push block is provided with a matching chamfered surface.

[0011] In some embodiments, the inner side of the welding head seat is provided with a first sliding groove along the axial direction, corresponding to the push block, and the inner side of the welding head seat is provided with a second sliding groove along the radial direction, corresponding to the horizontal clamping block.

[0012] In some embodiments, the system further includes a base, the push mechanism being fixedly installed on the inner side of the base, and the welding head seat being inserted into the inner side of the base.

[0013] In some embodiments, the base is provided with an extension arm on its outer side for connection to the welding equipment body.

[0014] Secondly, this utility model also provides a welding device, including a protrusion welding head as described in any of the above.

[0015] Compared with the prior art, the protrusion welding head provided by this utility model provides independent elastic extension and retraction of each electrode head through an elastic telescopic mechanism, actively conforming to the workpiece, forming elastic self-adaptation, compensating for unevenness on the workpiece surface, and then rigidly locking the conforming pressure head group into a whole through a locking mechanism, and then applying pressure as a whole through an upward pushing mechanism, so that the electrode pressure head and the workpiece are in full contact before applying pressure as a whole, and relatively balancing the pressure of multi-point welding, effectively improving the consistency of welding quality. Attached Figure Description

[0016] Figure 1 It is the bump welding head provided in this embodiment of the utility model; Figure 2 It is the bump welding head provided in this embodiment of the utility model; Figure 3 This is the bump welding head provided in this embodiment of the utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Welding head holder; 101. First slide groove; 102. Second slide groove; 11. Bottom shell; 12. Central shaft column; 12a. Support rod; 13. Guide slide groove; 2. Electrode indenter; 201. Guide groove; 202. Limiting flange; 3. Elastic telescopic mechanism; 31. Sleeve; 32. Spring; 4. Locking mechanism; 41. Telescopic mechanism; 42. Base frame; 43. Push block; 44. Horizontal clamping block; 45. Inclined surface; 5. Pushing mechanism; 6. Base; 7. Extend the outrigger. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] To address the technical problems of poor contact or excessive pressure in multi-point welding on uneven workpiece surfaces, this invention provides a raised-point welding head. This head features an elastic telescopic mechanism that allows each electrode head to independently extend and retract, actively conforming to the workpiece and forming an elastic self-adaptive structure to compensate for unevenness on the workpiece surface. A locking mechanism then rigidly locks the conforming head assembly into a single unit. Finally, an upward-pushing mechanism applies pressure as a whole, ensuring full contact between the electrode heads and the workpiece before applying overall pressure. This balanced pressure across multiple welding points effectively improves the consistency of welding quality.

[0020] It should be noted that the convex welding head described in this utility model is used in, but not limited to, convex welding equipment. For ease of explanation, this utility model only uses the application of the convex welding head in convex welding equipment as an example for explanation. The principle of the convex welding head applied to other types of equipment is essentially the same as that applied to convex welding equipment, and will not be described in detail here.

[0021] Please see Figure 1 , Figure 2 and Figure 3This utility model provides a convex spot welding head, which includes a welding head base 1, electrode pressure heads 2, elastic telescopic mechanisms 3, locking mechanisms 4, and pushing mechanisms 5. The three electrode pressure heads 2 are slidably connected to the welding head base 1 and are guided to slide axially along the welding head base 1. The elastic telescopic mechanisms 3 are correspondingly arranged between the electrode pressure heads 2 and the welding head base 1, allowing the electrode pressure heads 2 to elastically extend and retract along the axial direction of the welding head base 1, enabling each electrode pressure head 2 to independently extend and retract. The welding surface to be contacted; the locking mechanism 4 is installed on the welding head seat 1 and has a movable locking end, so that the electrode pressure head 2 has a locked state and a sliding state. After the workpiece to be welded and each electrode pressure head 2 elastically expand and contract, they all form contact. Then, the locking mechanism 4 locks each electrode pressure head 2 to prevent it from moving; the movable end of the pushing mechanism 5 is connected to the welding head seat 1, driving the welding head seat 1 to push upward and apply pressure, driving the welding head seat 1 and the locked electrode pressure head 2 to apply pressure and weld together.

[0022] In this embodiment, the electrode pressure head 2 first adapts elastically, and each pressure head independently expands and contracts elastically to actively fit the workpiece. Then, the locking mechanism rigidly locks the fitted pressure head group into a whole before applying pressure as a whole. After locking, the rigidity of the entire welding head seat is enhanced, which can effectively suppress vibration and micro-displacement during the welding process, which is conducive to the formation of a stable weld nugget. Furthermore, the locking state eliminates elastic variables, so that the final welding pressure is precisely controlled by the upward pushing mechanism. This forms the action logic of first independently elastically fitting, then rigidly locking the whole before welding.

[0023] In one embodiment, please refer to Figure 2 and Figure 3 In order to provide sliding guidance for the electrode pressure head 2 and to provide accommodating space for the elastic telescopic mechanism 3 and the locking mechanism 4, the welding head base 1 includes a bottom shell 11 and a central column 12. The central column 12 is connected to the inner side of the bottom shell 11 by a support rod, forming a cavity between the central column 12 and the bottom shell 11, which can accommodate the elastic telescopic mechanism 3 and the locking mechanism 4. The outer side of the central column 12 is provided with guide grooves 13 corresponding to the electrode pressure heads 2 one by one, and each electrode pressure head 2 is slidably connected to the inner side of the guide groove 13.

[0024] For further details, please refer to Figure 2 and Figure 3 In order to provide elastic extension and support, the elastic extension mechanism 3 includes a sleeve 31 and a spring 32. The sleeve 31 is fixedly connected to the inner bottom wall of the bottom shell 11. The spring 32 is built into the inner side of the sleeve 31 and abuts against the electrode pressure head 2. Through the pushing of the spring 32, the electrode pressure head 2 is elastically supported and allowed to elastically extend and retract.

[0025] For further details, please refer to Figure 2 and Figure 3 In order to provide sliding guidance and improve the stability of the expansion and contraction during elastic expansion and contraction, a guide groove 201 is provided at the bottom of the electrode pressure head 2. The sleeve 31 is inserted into and slidably connected to the guide groove 201. The relative sliding between the sleeve 31 and the electrode pressure head 2 provides sliding guidance. The top end of the spring 32 abuts against the inner top wall of the guide groove 201.

[0026] For further details, please refer to Figure 2 and Figure 3 To prevent the electrode pressure head 2 from detaching, a limiting flange 202 is provided on the side of the electrode pressure head 2 near the central column 12 to limit its upward extreme position. At the extreme position of upward movement, it abuts against the bottom end of the central column 12 to form a limit. Similarly, when the electrode pressure head 2 moves downward, it abuts against the top end of the sleeve 31 through the inner top wall of the guide groove 201 to form a limit and prevent it from moving downward.

[0027] In one embodiment, please refer to Figure 2 and Figure 3 To simultaneously lock multiple electrode pressure heads 2, the locking mechanism 4 includes a telescopic mechanism 41, a base frame 42, push blocks 43, and horizontal clamping blocks 44. The telescopic mechanism 41 is installed inside the welding head seat 1. The base frame 42 is connected to the telescopic end of the telescopic mechanism 41. The base frame 42 has a hollow opening to avoid the support rod 12a and the sleeve 31. The push blocks 43 are connected to the base frame 42 one-to-one with the electrode pressure heads 2. When the base frame 42 moves upward, it pushes the three push blocks 43 upward together. The horizontal clamping blocks 44 slide one-to-one with the push blocks 43. The horizontal clamping block 44 is movably connected to the welding head seat 1 and slides radially along the welding head seat 1. It is used to abut against the electrode pressure head 2 to lock the electrode pressure head 2. The side of the horizontal clamping block 44 opposite to the push block 43 is provided with a matching inverted inclined surface 45. When the push block 43 moves upward, the inverted inclined surfaces 45 generate a squeezing and pushing force. With the cooperation of the inverted inclined surfaces 45, a radial lateral pushing force is formed, which pushes the horizontal clamping block 44 to clamp the electrode pressure head 2 into the guide groove 13. The three horizontal clamping blocks 44 lock each electrode pressure head 2 simultaneously, and can effectively lock different axial extension and retraction positions of the electrode pressure head 2.

[0028] Understandably, the locking mechanism 4 can also adopt three separate locking structures, which can be set according to the actual situation. That is, each push block 43 and the horizontal clamping block 44 can be driven by a set of telescopic mechanisms 41, or other driving structures that can lock the electrode pressure head 2 can be used. No single limitation is made here.

[0029] Specifically, the inner side of the welding head seat 1 is provided with a first groove 101 corresponding to the push block 43 along the axial direction. The push block 43 is slidably connected to the inner side of the first groove 101 to guide the push block 43 to slide along the axial direction. The inner side of the welding head seat 1 is provided with a second groove 102 corresponding to the horizontal clamping block 44 along the radial direction. The horizontal clamping block 44 is slidably connected to the inner side of the second groove 102 to guide the horizontal clamping block 44 to slide along the radial direction.

[0030] Understandably, both the telescopic mechanism 41 and the pushing mechanism 5 can be existing mature equipment with linear telescopic function, such as electric push rods, hydraulic push rods or pneumatic push rods. Furthermore, displacement or pressure sensors can be integrated into the electrode pressure head 2, the telescopic mechanism 41 and the pushing mechanism 5 to monitor the telescopic amount of each pressure head, realize process monitoring and quality traceability, and facilitate feedback and corresponding adjustment of the overall pressure. This will not be elaborated further here.

[0031] In one embodiment, please refer to Figure 2 and Figure 3 In order to hide and externally protect the pushing mechanism 5 and the welding head seat 1, a base 6 is also included. The pushing mechanism 5 is fixedly installed on the inner side of the base 6, and the welding head seat 1 is inserted into the inner side of the base 6, thereby internally protecting the pushing mechanism 5 and the welding head seat 1.

[0032] Furthermore, the base 6 is provided with an extension arm 7 on its outer side for connecting to the main body of the welding equipment.

[0033] This utility model also provides a welding device, including a protrusion welding head as described in any of the above embodiments, wherein the welding device has a welding fixture that matches the workpiece, and after the workpiece is installed on the welding fixture, it can be pressed onto the protrusion welding head.

[0034] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail as follows: After the workpiece is installed on the welding fixture on the welding equipment, it is pressed onto the protruding welding head, that is, pressed onto the three electrode pressure heads 2, and compressed by the extrusion spring 32. Each electrode pressure head 2 extends and retracts individually, so that they are all in contact with the surface of the workpiece. Then, the base frame 42 is pushed up by the telescopic mechanism 41. The base frame 42 drives the push block 43 to move up. Under the extrusion of the inclined surface 45, the horizontal clamping block 44 is pushed to move laterally and press against the electrode pressure head 2 to form a lock. Then, the welding head seat 1 and each electrode pressure head 2 on it are pushed up as a whole by the upward pushing mechanism 5 for welding. After the welding is completed, the telescopic mechanism 41 of the locking mechanism 4 moves in the opposite direction to release the lock. After the workpiece is removed, the spring 32 rebounds, which can make the electrode pressure head 2 return to the initial position.

[0035] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A bump welding head, characterized in that, include: Welding head holder; Electrode pressure heads, a plurality of said electrode pressure heads being slidably connected to the welding head seat; An elastic telescopic mechanism is provided between the electrode pressure head and the welding head seat in a one-to-one correspondence, so that the electrode pressure head can elastically telescopic along the axial direction of the welding head seat; A locking mechanism is mounted on the welding head seat and has a movable locking end, so that the electrode pressure head has a locked state and a sliding state. as well as The upward pushing mechanism has its movable end connected to the welding head seat, driving the welding head seat to push upward and apply pressure.

2. The bump welding head according to claim 1, characterized in that, The welding head holder includes a bottom shell and a central column. The central column is connected to the inner side of the bottom shell by a support rod. The outer side of the central column is provided with guide grooves that correspond one-to-one with the electrode pressure head.

3. The bump welding head according to claim 2, characterized in that, The elastic telescopic mechanism includes a sleeve and a spring, with the spring built inside the sleeve and abutting against the electrode pressure head.

4. The bump welding head according to claim 3, characterized in that, The bottom of the electrode pressure head is provided with a guide groove, the sleeve is inserted and slidably connected with the guide groove, and the top of the spring abuts against the inner top wall of the guide groove.

5. The bump welding head according to claim 2, characterized in that, The electrode indenter has a limiting flange on the side near the central column to limit its upward movement to extreme positions.

6. The bump welding head according to claim 1, characterized in that, The locking mechanism includes a telescopic mechanism, a base frame, a push block, and a horizontal clamping block. The telescopic mechanism is installed on the inner side of the welding head seat. The base frame is connected to the telescopic end of the telescopic mechanism. The push block is connected to the base frame in a one-to-one correspondence with the electrode pressure head. The horizontal clamping block is slidably connected to the welding head seat in a one-to-one correspondence with the push block and slides radially along the welding head seat to abut against the electrode pressure head to lock the electrode pressure head. The side of the horizontal clamping block opposite to the push block is provided with a matching chamfered surface.

7. The bump welding head according to claim 6, characterized in that, The inner side of the welding head seat is provided with a first sliding groove along the axial direction, which corresponds to the push block one by one, and the inner side of the welding head seat is provided with a second sliding groove along the radial direction, which corresponds to the horizontal clamping block one by one.

8. The bump welding head according to claim 1, characterized in that, It also includes a base, the pushing mechanism is fixedly installed on the inner side of the base, and the welding head seat is inserted into the inner side of the base.

9. The bump welding head according to claim 8, characterized in that, The base is provided with an extension arm on its outer side for connecting to the main body of the welding equipment.

10. A welding device, characterized in that, Includes the bump welding head as described in any one of claims 1-9.

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