Welding mechanism

Abstract

The welding mechanism comprises an automatic welding gun and a plurality of positioning and clamping assemblies, the automatic welding gun comprises a movable arm electrode and a static arm electrode, the automatic welding gun is connected with a driving device and moves under the action of the driving device, the clamping assemblies are used for clamping pieces to be welded, the clamping assemblies comprise grounding electrodes, and the grounding electrodes are connected with the movable arm electrode and the static arm electrode. The static arm electrode is in electric contact with the grounding electrode, and the movable arm electrode is used for welding the to-be-welded piece. The to-be-welded part is positioned and clamped through the clamping assembly, the driving device drives the automatic welding gun to move, different positions of the to-be-welded part are welded, the welding precision and the welding efficiency are improved, the welding gun does not need to be held manually, and the labor intensity is reduced; the static arm electrode is in electric contact with the grounding electrode, electric shock is effectively prevented, welding safety is guaranteed, cathode grounding is beneficial to electric arc stabilization, splashing is reduced, and a welding seam is more attractive.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding mechanism. Background Art

[0002] In the automotive manufacturing industry, the four doors and two hoods of a car are considered opening and closing components of the vehicle body. After assembly with the vehicle body, they must maintain uniform door gaps and good shape and flushness with surrounding components, ensuring smooth edge transitions and precise and stable overall dimensions. Since the four doors and two hoods are the exterior surfaces of the vehicle body, they must be smooth and flat, free of dents, dents, and other defects to ensure aesthetic appeal. Therefore, conventional welding cannot be used to assemble the inner and outer panels of the door hoods. Rolling hemming is required, followed by single-sided welding at the door edges. However, after rolling hemming, welding adjustments, and high-temperature painting, the door hoods can experience slight deformation, affecting the uniformity of the door hood gap. To strengthen the door hood, prevent misalignment of the inner and outer panels, maintain gap and flushness, and ensure good interchangeability, single-sided spot welding is performed at a repair welding station near the exit of the hemming press.

[0003] Among them, the principle of single-sided spot welding in white body automobile welding is the process of melting the plate through the welding gun to form a local molten core.

[0004] The existing single-side welding process mainly includes:

[0005] (1) Manual direct welding: manual welding is performed by holding a welding gun. Since the welding gun is heavy, manual welding is difficult to operate and the labor cost is high. In addition, the welding quality of workers varies greatly, making it difficult to ensure consistent welding quality. In addition, the weld nodules left over from welding will affect the subsequent painting process and the aesthetics of the outer surface.

[0006] (2) The robot drives the gripper to grab the workpiece and then transport it to the welding device on the balance hanger for seamless single-sided welding. The gripper is powered with positive electricity and the welding device with negative electricity. The balance hanger is used to restrain the electrode cable; welding is performed by changing the current loop. However, the welding effect is not ideal. Not only is the process too complicated, but it also causes a certain amount of waste in the site. This method of changing the positive and negative poles of the current by moving also poses a safety hazard. During the welding process, it is easy to cause welding defects and sheet metal parts to be compressed and deformed due to excessive welding voltage, so continuous debugging is required. This method has a long cycle and is costly. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides a welding mechanism.

[0008] The technical solution of the utility model for solving the above technical problems is as follows: a welding mechanism, including an automatic welding gun and multiple positioning clamping assemblies, the automatic welding gun including a movable arm electrode and a stationary arm electrode, the automatic welding gun is connected to a driving device and moves under the action of the driving device, multiple groups of the clamping assemblies are used to clamp the workpiece to be welded, the clamping assembly includes a grounding electrode, the stationary arm electrode is in electrical contact with the grounding electrode, and the movable arm electrode is used to weld the workpiece to be welded.

[0009] On the basis of the above technical solution, the present invention can also make the following improvements to the above technical solution:

[0010] Preferably, the clamping assembly includes multiple positioning clamping assemblies 1, the positioning clamping assembly 1 includes a support column 1 and a support column 2, the support column 1 is equipped with a contour positioning block 1, the support column 2 is provided with a clamping cylinder 1, the output end of the clamping cylinder 1 is connected to a clamping claw 1, and the clamping claw 1 cooperates with the contour positioning block 1 to clamp the workpiece to be welded.

[0011] Preferably, a suction cup is provided on the contour positioning block 1, and the suction cup is used to absorb the workpiece to be welded.

[0012] Preferably, the support column 1 is also equipped with a contour positioning block 2, and the support column 2 is equipped with a clamping cylinder 2. The output end of the clamping cylinder 2 is connected to a clamping claw 2, and the clamping claw 2 cooperates with the contour positioning block 2 to clamp the workpiece to be welded.

[0013] Preferably, the output end of the clamping cylinder 2 is insulatedly connected to the grounding electrode 1 through the support arm 1.

[0014] Preferably, the clamping assembly also includes multiple positioning clamping assemblies 2, the positioning clamping assembly 2 includes a support column 3 and a support column 4, the support column 3 is equipped with a contour positioning block 3, the support column 4 is equipped with a clamping cylinder 3, the output end of the clamping cylinder 3 is connected to a clamping claw 3, and the clamping claw 3 cooperates with the contour positioning block 3 to clamp the workpiece to be welded.

[0015] Preferably, the contoured positioning block three is provided with a suction cup two, and the suction cup two is used to absorb the workpiece to be welded.

[0016] Preferably, the output end of the clamping cylinder three is insulatedly connected to the grounding electrode two through the support arm two.

[0017] Preferably, the grounding pole is a contoured copper block.

[0018] Preferably, the movable arm electrode and the stationary arm electrode are arranged in parallel.

[0019] The beneficial effects of the present invention are as follows: the workpiece to be welded is positioned and clamped by the clamping assembly, and the driving device drives the automatic welding gun to move, so that welding can be performed at different positions of the workpiece to be welded, thereby improving welding accuracy and welding efficiency, and eliminating the need for manual hand-held welding guns, thereby reducing labor intensity; the static arm electrode is in electrical contact with the grounding electrode, thereby effectively preventing electric shock and ensuring safety during welding, and the cathode grounding is beneficial to the stability of the arc, reduces spatter, and makes the weld more beautiful; the inner side of the workpiece to be welded is welded by the movable arm electrode, which will not cause damage to the exterior surface of the workpiece to be welded, thereby ensuring the quality of the workpiece to be welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 For this utility model Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0022] Figure 3 This is a structural diagram of the positioning and clamping component 1 of the utility model;

[0023] Figure 4 This is a structural diagram of the second positioning and clamping component of the utility model;

[0024] Figure 5 This is a schematic diagram of the positioning and clamping assembly 2 of the present invention from another angle.

[0025] The accompanying drawings are marked as follows: 1. Base plate; 2. Automatic welding gun; 3. Moving arm electrode; 4. Stationary arm electrode; 5. Positioning and clamping assembly one; 501. Support column one; 502. Support column two; 503. Profiling positioning block one; 504. Suction cup one; 505. Profiling positioning block two; 506. Clamping cylinder one; 507. Clamping claw one; 508. Limiting plate one; 509. Clamping cylinder two; 510. Clamping claw two; 511. Support arm one; 512. Grounding electrode one; 6. Positioning and clamping assembly two; 601. Support column three; 602. Support column four; 603. Profiling positioning block three; 604. Clamping claw three; 605. Clamping cylinder three; 606. Suction cup two; 607. Support arm two; 608. Grounding electrode two; 7. Parts to be welded. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] like Figures 1 to 5As shown, the utility model discloses a welding mechanism, including an automatic welding gun 2 and a plurality of positioning clamping assemblies installed on a substrate 1, the automatic welding gun 2 including a movable arm electrode 3 and a stationary arm electrode 4, the automatic welding gun 2 is connected to a driving device and moves under the action of the driving device, wherein the driving device is a robot or a driving cylinder, and a plurality of clamping assemblies are used to clamp the workpiece 7 to be welded, the clamping assembly includes a grounding electrode, and the grounding electrode is a contoured copper block, which has good electrical conductivity and heat conduction effect and low cost, the stationary arm electrode 4 is in electrical contact with the grounding electrode to achieve local grounding, ensure safety of use and reduce wiring, the movable arm electrode 3 is used to weld the workpiece 7 to be welded, and in this embodiment, the workpiece 7 to be welded is the inner panel of the engine cover.

[0028] Furthermore, in order to improve the convenience of welding and reduce the difficulty of welding, the movable arm electrode 3 and the stationary arm electrode 4 are arranged in parallel.

[0029] In this embodiment, the clamping assembly includes multiple positioning clamping assemblies 5, and the positioning clamping assembly 5 includes a support column 501 and a support column 502 installed on the substrate 1. The support column 501 is detachably installed with a contour positioning block 503 by screws or bolts. The shape of the contour positioning block 503 is adapted to the shape of the positioned workpiece 7 to be welded. The support column 502 is provided with a clamping cylinder 506, and the output end of the clamping cylinder 506 is connected to two L-shaped clamping claws 507. The clamping claws 507 cooperate with the contour positioning block 503 to clamp the workpiece 7 to be welded, thereby ensuring the clamping effect of the workpiece 7 to be welded and the subsequent welding quality.

[0030] Furthermore, a groove is provided on the contour positioning block 1 503, and a suction cup 1 504 is provided in the groove. The suction cup 1 504 is used to absorb the workpiece 7 to be welded. The workpiece 7 to be welded is initially positioned by the suction cup 1 504 and then clamped by the clamping claw 1 507, which reduces the difficulty of clamping and ensures the accuracy of positioning.

[0031] The support column 1 501 is also installed with a contour positioning block 2 505 through screws or bolts, and the support column 2 502 is installed with a clamping cylinder 2 509. The output end of the clamping cylinder 2 509 is connected to a clamping claw 2 510. The clamping claw 2 510 cooperates with the contour positioning block 2 505 to clamp the workpiece 7 to be welded, which can not only ensure the clamping effect of the workpiece 7 to be welded, but also make the overall structure more compact and reduce the footprint.

[0032] Furthermore, different profiling positioning blocks 1 503 and profiling positioning blocks 2 505 can be replaced according to the shape or model of the workpiece 7 to be welded, thereby improving the versatility of the welding mechanism and reducing the cost of use.

[0033] The output end of the clamping cylinder 2 509 is insulated and connected to the grounding electrode 1 512 through the support arm 1 511, so that the static arm electrode 4 can contact the grounding electrode 1 512 nearby, reducing the flying wire situation and improving the flexibility during welding.

[0034] Furthermore, support arm 1 511 and clamping claw 2 510 are installed on a support plate, and the support plate is installed on the output end of clamping cylinder 2 509, so that clamping cylinder 2 509 drives clamping claw 2 510, support arm 1 511 and grounding electrode 1 512 to move synchronously, thereby providing operating space, facilitating the removal and placement of the workpiece 7 to be welded, and improving the convenience of operation.

[0035] Furthermore, a limiting plate 508 is installed on the support column 501. The limiting plate 508 is located on one side of the support column 501. The limiting plate 508 limits the outer edge of the weldment 7 to reduce sliding and ensure positioning accuracy.

[0036] The clamping assembly also includes multiple positioning clamping assemblies 2 6. When in use, the positioning clamping assembly 1 5 and the positioning clamping assembly 2 6 can be used in combination to improve the flexibility of use and ensure the clamping effect of the workpiece 7 to be welded. The figure only shows part of the positioning clamping assembly 1 5 and the positioning clamping assembly 2 6, wherein the positioning clamping assembly 2 6 includes a support column 3 601 and a support column 4 602. The support column 3 601 is detachably installed with a contour positioning block 3 603 by screws or bolts, and the support column 4 602 is installed with a clamping cylinder 3 605. The output end of the clamping cylinder 3 605 is connected to a clamping claw 3 604. The clamping claw 3 604 cooperates with the contour positioning block 3 603 to clamp the workpiece 7 to be welded. Through the cooperation of the clamping claw 3 604 and the contour positioning block 3 603, the firmness of the positioning and clamping of the workpiece 7 to be welded is guaranteed, the welding quality is guaranteed, and the formation of welds is avoided.

[0037] Furthermore, a suction cup 2 606 is provided on the contour positioning block 3 603. The suction cup 2 606 is used to adsorb the workpiece 7 to be welded. The workpiece 7 to be welded is initially adsorbed and positioned by the suction cup 2 606, and then clamped by the clamping claw 3 604, thereby reducing the difficulty of clamping the workpiece 7 to be welded, ensuring the accuracy of positioning, and ensuring the quality of subsequent welding.

[0038] The output end of the clamping cylinder three 605 is insulated and connected to the grounding electrode two 608 through the support arm two 607, so that the static arm electrode 4 can be in contact with the grounding electrode one 512 nearby, ensuring safety during use, reducing the situation of flying wires, and improving flexibility during welding.

[0039] Furthermore, the connection between support arm 1 511 and grounding electrode 1 512, as well as the connection between support arm 2 607 and grounding electrode 2 608 are provided with insulating bakelite or insulating sleeves to prevent current from flowing into positioning clamping component 1 5 or positioning clamping component 2 6 and causing accidental electric shock, thereby ensuring safety during use.

[0040] Optionally, when welding a single type of workpiece 7, the profiling positioning block 1 503, the profiling positioning block 2 505 and the profiling positioning block 3 603 can be directly fixed on the support column respectively, reducing the number of disassembly and assembly times and ensuring the stability of positioning.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A welding mechanism, characterized in that: The invention comprises an automatic welding gun (2) and a plurality of positioning clamping assemblies, wherein the automatic welding gun (2) comprises a movable arm electrode (3) and a stationary arm electrode (4), the automatic welding gun (2) is connected to a driving device and moves under the action of the driving device, the plurality of groups of the clamping assemblies are used to clamp a workpiece to be welded (7), the clamping assembly comprises a grounding electrode, the stationary arm electrode (4) is in electrical contact with the grounding electrode, and the movable arm electrode (3) is used to weld the workpiece to be welded (7).

2. The welding mechanism according to claim 1, characterized in that: The clamping assembly includes a plurality of positioning clamping assemblies (5), wherein the positioning clamping assembly (5) includes a support column (501) and a support column (502), wherein the support column (501) is provided with a contour positioning block (503), and the support column (502) is provided with a clamping cylinder (506), and the output end of the clamping cylinder (506) is connected with a clamping claw (507), and the clamping claw (507) cooperates with the contour positioning block (503) to clamp the workpiece (7) to be welded.

3. The welding mechanism according to claim 2, characterized in that: The contoured positioning block (503) is provided with a suction cup (504), and the suction cup (504) is used to absorb the workpiece (7) to be welded.

4. The welding mechanism according to claim 2 or 3, characterized in that: The support column 1 (501) is also equipped with a contour positioning block 2 (505), and the support column 2 (502) is equipped with a clamping cylinder 2 (509). The output end of the clamping cylinder 2 (509) is connected to a clamping claw 2 (510), and the clamping claw 2 (510) cooperates with the contour positioning block 2 (505) to clamp the workpiece to be welded (7).

5. The welding mechanism according to claim 4, characterized in that: The output end of the clamping cylinder 2 (509) is insulatedly connected to the grounding electrode 1 (512) through the support arm 1 (511).

6. The welding mechanism according to claim 1 or 2, characterized in that: The clamping assembly also includes a plurality of positioning clamping assemblies two (6), the positioning clamping assembly two (6) includes a support column three (601) and a support column four (602), the support column three (601) is installed with a contour positioning block three (603), the support column four (602) is installed with a clamping cylinder three (605), the output end of the clamping cylinder three (605) is connected to a clamping claw three (604), the clamping claw three (604) cooperates with the contour positioning block three (603) to clamp the workpiece to be welded (7).

7. The welding mechanism according to claim 6, characterized in that: The third contour positioning block (603) is provided with a second suction cup (606), and the second suction cup (606) is used to absorb the workpiece to be welded (7).

8. The welding mechanism according to claim 6, characterized in that: The output end of the clamping cylinder three (605) is insulatedly connected to the grounding electrode two (608) through the support arm two (607).

9. The welding mechanism according to claim 1, characterized in that: The grounding pole is a contoured copper block.

10. The welding mechanism according to claim 1, characterized in that: The movable arm electrode (3) and the stationary arm electrode (4) are arranged in parallel.

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