Projection welding device for nut of automobile body shell

Abstract

The utility model discloses an automobile body shell nut projection welding device which comprises a workbench, a middle supporting column, two side face supporting structures and a projection welding structure are arranged on the workbench, the height and the transverse position of each side face supporting structure can be adjusted, a first telescopic air cylinder is arranged over the workbench, and the bottom of the first telescopic air cylinder is a pressing head capable of stretching out and drawing back up and down. The projection welding structure comprises a second telescopic air cylinder, the second telescopic air cylinder is fixed to the workbench, the transverse telescopic end of the second telescopic air cylinder is connected with a buffering air cylinder capable of buffering force in the vertical direction, the buffering end of the buffering air cylinder is connected with a pressing block, and the end of the pressing block is connected with an end block. The pressing block and the end block are both located above the supporting column, the two side face supporting structures are located on the two sides of the middle supporting column respectively, the upper portion of the supporting column is a limiting supporting step for supporting a vehicle body shell, and a projection welding electrode tip is arranged at the upper end of the limiting supporting step. By means of the projection welding device, labor cost is reduced, projection welding accuracy is improved, and therefore the percent of pass of products is improved.

Description

Technical Field

[0001] The utility model relates to a projection welding device for a nut of an automobile body shell, belonging to the technical field of automobile parts processing. Background Art

[0002] A car body has multiple housings, both surface and interior. These housings are installed using either snap-on structures or nuts and screws. Currently, installing nuts on the housings is typically done manually. This involves placing the housing on a workbench, manually clamping the nuts with a fixture, and then projecting the nuts together. However, this method can cause positioning errors, potentially tilting the nuts, resulting in substandard positioning and impacting the overall housing quality. Summary of the Invention

[0003] The technical problem to be solved by the utility model is: how to improve the position accuracy when welding between the shell and the nut.

[0004] In order to solve the above technical problems, the technical solution of the utility model is to provide a projection welding device for automobile body shell nuts, which is characterized in that it includes a workbench, an intermediate support column, two side support structures with adjustable height and lateral position, and a projection welding structure. A first telescopic cylinder is provided directly above the workbench, and the bottom of the first telescopic cylinder is a pressure head that can be telescoped up and down. The projection welding structure includes a second telescopic cylinder, which is fixed on the workbench, and the lateral telescopic end of the second telescopic cylinder is connected to a buffer cylinder that can buffer the forces in the up and down directions. The buffer end of the buffer cylinder is connected to a pressure block, and the end of the pressure block is connected to an end block; the pressure block and the end block are both located above the support column, and the two side support structures are respectively located on both sides of the intermediate support column. The upper part of the support column is a limiting support step for supporting the car body shell, and the upper end of the limiting support step is provided with a projection welding electrode head; during welding, the end block is moved to directly above the projection welding electrode head by the second telescopic cylinder, and the pressure head is located directly above the pressure block.

[0005] Preferably, the workbench is further provided with a raised platform which is increased according to height requirements, and the middle support column is arranged on the raised platform.

[0006] Preferably, during welding, the pressing head is located just above the middle position of the pressing block.

[0007] Preferably, the pressure head and the projection welding electrode head are both located in the lateral movement direction of the second telescopic cylinder.

[0008] Preferably, the side support structure includes a pad block, which is fixed on the workbench, and the pad block is connected to one end of the first support bending rod, the other end of the first support bending rod is connected to one end of the second support bending rod, the other end of the second support bending rod is connected to one end of the third support bending rod, and the other end of the third support bending rod is connected to one end of the support end head; the connection positions between the first support bending rod, the second support bending rod and the third support bending rod are all provided with multiple threaded holes, and the first support bending rod, the second support bending rod and the third support bending rod are threadedly connected to each other by screws passing through the threaded holes; the vehicle body shell is jointly supported by the limiting support step and the support end heads on the two side support structures.

[0009] Preferably, the first support bending rod, the second support bending rod and the third support bending rod are all formed by two straight rods crossed and connected at right angles, and all the straight rods of the first support bending rod, the second support bending rod and the third support bending rod are evenly distributed with multiple threaded holes along the length direction, and the first support bending rod, the second support bending rod and the third support bending rod are all fastened together by screws passing through the threaded holes.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] This utility model has a simple structure, supporting the vehicle body shell through the middle support column and the side support structure. It is suitable for welding vehicle body shells of different specifications. By adjusting the telescopic stroke of the second telescopic cylinder, the nut can be accurately projected and welded. The buffer cylinder realizes the collision rebound when the pressure block is pressed, and can effectively restore it to its original state after the pressure is released. The device of this utility model reduces labor costs and improves the accuracy of projection welding, thereby improving the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a structural diagram of a projection welding device for automobile body shell nuts. DETAILED DESCRIPTION

[0013] In order to make the present invention more clear and easy to understand, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0014] The utility model provides a projection welding device for automobile body shell nuts, such as Figure 1As shown, it includes a workbench 3, on which are fixedly mounted a raised platform 6, a side support structure 4, and a projection welding structure 5. The raised platform 6 is provided with an intermediate support column 2, which supports the vehicle body shell via the intermediate support column 2 and the side support structures 4 located on both sides of the intermediate support column 2. A first telescopic cylinder 1 is provided directly above the workbench 3. The bottom of the first telescopic cylinder 1 is a pressure head 11 that can be extended and retracted up and down. The projection welding structure 5 includes a second telescopic cylinder 51, which is fixed to the workbench 3. The lateral telescopic end of the second telescopic cylinder 51 is connected to a buffer cylinder 52, and the buffer end of the buffer cylinder 52 is connected to a pressure block 53. The end of the pressure block 53 is connected to an end block 54. Both the pressure block 53 and the end block 54 are located above the support column 2.

[0015] The upper portion of the support column 2 is a limited support step 21, the upper end of which is provided with a projection welding electrode tip 22. The side support structure 4 includes a pad 41, which is fixed to the workbench 3. The pad 41 is connected to one end of a first support bending rod 42, the other end of which is connected to one end of a second support bending rod 43, the other end of which is connected to one end of a third support bending rod 44, and the other end of which is connected to one end of a support end 45. The limited support step 21 and the support ends 45 on the two side support structures 4 jointly support the vehicle body.

[0016] The first, second, and third bending support rods 42, 43, and 44 are each formed from two straight rods connected at right angles, similar to an angle steel structure. Each of the straight rods 42, 43, and 44 has multiple threaded holes distributed along their lengths. This means that the first, second, and third bending support rods 42, 43, and 44 are connected by screws passing through the threaded holes. By inserting screws into different threaded holes, the height and lateral distance of the side support structure 4 can be adjusted, allowing it to accommodate vehicle bodies of varying sizes.

[0017] The use process of this utility model is as follows:

[0018] The height and lateral distance of the side support structure 4 are adjusted according to the specifications of the vehicle body shell so that they can meet the support position of the corresponding vehicle body shell. The hole in the middle of the vehicle body shell is passed through the projection welding electrode head 22 on the support column 2 and supported on the limit support step 21. At the same time, the support end head 45 of the side support structure 4 is supported on both sides of the vehicle body shell. The nut to be welded is then placed on the projection welding electrode head 22 protruding from the vehicle body shell. The second telescopic cylinder 51 is then activated, and its telescopic end drives the buffer cylinder 52, the pressure block 53, and the end block 54 to move laterally, so that the end block 54 is directly above the projection welding electrode head 22. Finally, the first telescopic cylinder 1 is activated, and its telescopic end drives the pressure head 11 to move downward and press on the top of the pressure block 53. At the same time, the pressure block 53 overcomes the buffering force of the buffer cylinder 52 and moves downward, thereby driving the end block 54 to press downward, so that the end block 54 contacts the nut, thereby completing the projection welding circuit and welding the nut to the vehicle body shell. Finally, the first telescopic cylinder 1 drives the pressure head 11 to move upward, the pressure block 53 rebounds upward and returns to its original position, the second telescopic cylinder 51 retracts to its initial position, and the vehicle body shell with the nut welded thereon is removed.

Claims

1. A projection welding device for nuts of automobile body shell, characterized in that: The invention comprises a workbench (3), wherein the workbench (3) is provided with an intermediate support column (2), two side support structures (4) with adjustable height and lateral position, and a projection welding structure (5); a first telescopic cylinder (1) is provided directly above the workbench (3); the bottom of the first telescopic cylinder (1) is a pressure head (11) that can be telescoped up and down; the projection welding structure (5) comprises a second telescopic cylinder (51); the second telescopic cylinder (51) is fixed on the workbench (3); the lateral telescopic end of the second telescopic cylinder (51) is connected to a buffer cylinder (52) that can buffer the force in the up and down directions; the buffer cylinder ( The buffer end of the pressure block (52) is connected to the pressure block (53), and the end of the pressure block (53) is connected to the end block (54); the pressure block (53) and the end block (54) are both located above the support column (2), and the two side support structures (4) are respectively located on both sides of the middle support column (2); the upper part of the support column (2) is a limit support step (21) for supporting the vehicle body shell, and the upper end of the limit support step (21) is provided with a projection welding electrode head (22); during welding, the end block (54) is moved to the position directly above the projection welding electrode head (22) by the second telescopic cylinder (51), and the pressure head (11) is located directly above the pressure block (53).

2. The projection welding device for automobile body shell nuts according to claim 1, characterized in that: The workbench (3) is further provided with a raised platform (6) which is increased according to height requirements, and the middle support column (2) is arranged on the raised platform (6).

3. The projection welding device for automobile body shell nuts according to claim 1, characterized in that: During welding, the pressing head (11) is located just above the middle position of the pressing block (53).

4. The projection welding device for automobile body shell nuts according to claim 1, characterized in that: The pressure head (11) and the projection welding electrode head (22) are both located in the lateral moving direction of the second telescopic cylinder (51).

5. The projection welding device for automobile body shell nuts according to claim 1, characterized in that: The side support structure (4) includes a pad (41), which is fixed on the workbench (3), and the pad (41) is connected to one end of the first support bending rod (42), the other end of the first support bending rod (42) is connected to one end of the second support bending rod (43), the other end of the second support bending rod (43) is connected to one end of the third support bending rod (44), and the other end of the third support bending rod (44) is connected to one end of the support end (45); the connection positions between the first support bending rod (42), the second support bending rod (43), and the third support bending rod (44) are evenly distributed with a plurality of threaded holes, and the first support bending rod (42), the second support bending rod (43), and the third support bending rod (44) are threadedly connected to each other by screws passing through the threaded holes; the vehicle body shell is jointly supported by the limiting support step (21) and the support end (45) on the two side support structures (4).

6. The projection welding device for automobile body shell nuts according to claim 5, characterized in that: The first supporting bending rod (42), the second supporting bending rod (43), and the third supporting bending rod (44) are all formed by two straight rods that are crossed and connected at a right angle. A plurality of threaded holes are evenly distributed along the length direction on all the straight rods of the first supporting bending rod (42), the second supporting bending rod (43), and the third supporting bending rod (44). The first supporting bending rod (42), the second supporting bending rod (43), and the third supporting bending rod (44) are all fastened together by screws passing through the threaded holes.

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