A copper block welding device

Abstract

The application discloses a copper block welding device, which comprises a connecting assembly assembled on a spot welding clamp (13), a copper block body (1) detachably connected to the connecting assembly, the copper block body (1) is insulated from the spot welding clamp (13), and an electrode cap of a welding gun (12) connected with a spot welding robot (11) is attached to the copper block body (1) during welding. The copper block welding device is assembled at a corresponding position of the spot welding clamp, the welding gun is connected with the copper block body through a pressurizing device for electric welding, the welding of the workpiece can be completed in a narrow space, the feasibility of welding is realized, the appearance quality and the welding strength stability of the workpiece are met, the special welding gun and the corresponding electrode grinder for coping with the workpiece in the complex narrow space are avoided, the utilization rate of the welding gun is improved, the investment cost of the welding gun and spare parts thereof is reduced, the structure is simple, the processing is convenient, the project development cycle is shortened, and the work efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of resistance spot welding system, in particular to a copper block welding device. BACKGROUND

[0002] With the development of the automobile industry, in order to realize the pursuit of the appearance of the body and the spacious and bright interior space, in many cases, the structure of the parts inside the body is improved, including improving the shape of the parts, reducing the size of the parts, etc. However, for the improved parts, the welding space is small, the ordinary welding gun cannot reach the welding position, and the welding feasibility cannot be realized. Or special welding guns can realize welding, but usually in the robot workstation, in order to improve the utilization rate of equipment and reduce the investment cost, one welding gun needs to weld several parts, and the special welding gun is limited to only weld one kind of part, which cannot meet the welding of several parts at the same time. In addition, special electrode grinding blades are also required, and the procurement cycle of special welding guns, spare parts and electrode grinding blades is long, and the cost is high, resulting in long project cycle, high development cost and high follow-up spare part cost.

[0003] In summary, how to complete the welding of the parts in a small space and other problems are the problems that the technical personnel in the field urgently need to solve at present. SUMMARY

[0004] The purpose of the present application is to provide a copper block welding device which can realize welding of ordinary welding gun in a small space, and the stability of welding accessibility, welding appearance quality and welding strength.

[0005] To solve the above technical problems, the present application provides the following technical scheme:

[0006] A copper block welding device, comprising a connecting assembly assembled on a spot welding fixture, and a copper block body detachably connected to the connecting assembly, the copper block body being insulated from the spot welding fixture, and the electrode cap of the welding gun connected by the spot welding robot being attached to the copper block body during welding.

[0007] Preferably, the copper block body is provided with a cooling water pipe, and the water inlet and water outlet of the cooling water pipe are connected to the water inlet pipeline and water outlet pipeline of the workstation water and gas unit through water nozzles, respectively.

[0008] Preferably, the cooling water pipe comprises a transverse pipe, two vertical pipes connected to the water inlet and water outlet of the transverse pipe, respectively, and the other end of the vertical pipe is connected to the water nozzle, and the water inlet and water outlet of the cooling water pipe are arranged on the side wall of the two ends of the transverse pipe, respectively, and the two ends of the transverse pipe are sealed by a grommet.

[0009] Preferably, the connecting assembly comprises a first connecting block, a second connecting block, a third connecting block and a fourth connecting block, the fourth connecting block is assembled on the spot welding clamp, the third connecting block is assembled on the fourth connecting block and can slide longitudinally and transversely along the fourth connecting block, the second connecting block is assembled on the third connecting block, the first connecting block is assembled on the second connecting block, and the copper block body is placed on the first connecting block.

[0010] Preferably, the lower surface of the third connecting block is assembled on the upper surface of the fourth connecting block, and an adjusting gasket is arranged between the fitting surfaces of the third connecting block and the fourth connecting block.

[0011] Preferably, the first connecting block, the second connecting block, the third connecting block and the fourth connecting block are bolted respectively, and the bolts are connected in the connecting holes and the threaded holes of the fitting surfaces.

[0012] The first connecting block and the second connecting block and the second connecting block and the third connecting block are positioned by positioning pins connected in the positioning holes of the fitting surfaces.

[0013] Preferably, the diameter of the connecting hole of the third connecting block is greater than the diameter of the corresponding bolt, and the diameter of the threaded hole of the fourth connecting block is equal to the diameter of the bolt.

[0014] Preferably, the outer periphery of the second connecting block is wrapped with an insulating gasket, the insulating gasket is attached to the surface of the second connecting block, the material of the insulating gasket is bakelite, and the outer sides of the positioning pins and the bolts connecting the first connecting block and the second connecting block are provided with bakelite sleeves.

[0015] Preferably, the first connecting block is provided with a positioning sliding groove, and the copper block body is placed in the positioning sliding groove.

[0016] Preferably, the gap between the positioning sliding groove and the copper block body is 0.3mm-0.5mm.

[0017] The two sides of the positioning sliding groove are respectively provided with steps.

[0018] The copper block welding device provided by the application comprises a connecting assembly and a copper block body. The connecting assembly is one-to-one corresponding to the spot welding clamp, the connecting assembly is assembled on the spot welding clamp, and the connecting assembly and the spot welding clamp are relatively fixed.

[0019] The copper block body is placed below the connecting assembly position assembly, the copper block body is insulated from the spot welding clamp, the current of the copper block body cannot be transmitted to the spot welding clamp, and safety is ensured. The connecting assembly and the copper block body are detachably connected. When welding, the operator clamps the workpiece into the spot welding clamp, presses the start button, and the spot welding robot drives the welding gun to the welding position. The electrode cap of the welding gun connected by the spot welding robot is attached to the copper block body. The welding gun connected by the spot welding robot drives the copper block body to the workpiece. After the welding gun pressurizes the copper block body and the workpiece and fully attaches them, the welding gun indirectly releases the welding current through the copper block welding device, completes the welding of the workpiece, and realizes indirect welding.

[0020] Further, the material of the copper block body is chromium zirconium copper, which has good electrical conductivity, thermal conductivity and high hardness, further improving the stability of the welding strength.

[0021] The copper block welding device provided by the application is assembled at the corresponding position of the spot welding clamp, and the welding gun is used for welding by pressurizing the workpiece and the copper block body. The welding gun can complete the welding of the workpiece in a small space, realize the feasibility of welding, meet the appearance quality and welding strength stability requirements of the workpiece, avoid the need to provide special welding guns and corresponding electrode grinders for workpieces in complex and small spaces, improve the utilization rate of the welding gun, reduce the investment cost of the welding gun and its spare parts, and have simple structure and convenient processing. At the same time, the project development cycle is shortened, and the work efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0023] Fig. 1 It is a schematic view of the connection of the cooling water path of the copper block welding device in the robot workstation.

[0024] Fig. 2 It is a schematic view of the structure of the copper block welding device.

[0025] Fig. 3 It is a schematic view of the internal cooling water pipe of the copper block welding device.

[0026] The structures represented by the respective reference numerals in the drawings are as follows:

[0027] The copper block body 1, the first connecting block 2, the second connecting block 3, the third connecting block 4, the fourth connecting block 5, the insulating gasket 6, the adjusting gasket 7, the plug 8, the water nozzle 9, and the cooling water pipe 10. DETAILED DESCRIPTION

[0028] The core of the present application is to provide a copper block welding device, which can realize welding in a narrow space by a common welding gun, and the welding accessibility, welding appearance quality and welding strength stability.

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Please refer to Figs. 1 to 3 , Fig. 1 It is a schematic view of connection of a cooling water circuit of the copper block welding device in a robot workstation. Fig. 2 It is a schematic view of structure of the copper block welding device. Fig. 3 It is a schematic view of internal cooling water circuit of the copper block welding device.

[0031] In a specific embodiment, the copper block welding device provided by the present application comprises a connecting assembly assembled on a spot welding jig 13, and a copper block body 1 detachably connected to the connecting assembly. The copper block body 1 is insulated from the spot welding jig 13. During welding, an electrode cap of a welding gun 12 connected to a spot welding robot 11 is attached to the copper block body 1.

[0032] In the above structure, the copper block welding device comprises the connecting assembly and the copper block body 1. The connecting assembly is assembled on the spot welding jig 13, and the connecting assembly is fixed relative to the spot welding jig 13. The connecting assembly corresponds to the spot welding jig 13 one by one. For example, four sets of spot welding jigs 13 are provided, and four sets of copper block welding devices are arranged in the four sets of spot welding jigs 13. The number can be designed according to actual needs.

[0033] The copper block body 1 is placed on the connecting assembly below the connecting assembly position part. The copper block body 1 is insulated from the spot welding jig 13, so that the current of the copper block body 1 cannot be transmitted to the spot welding jig 13, ensuring safety. The connecting assembly and the copper block body 1 are detachably connected. During welding, the operator clamps the workpiece into the spot welding jig 13, presses the start button, and the spot welding robot 11 drives the welding gun 12 to the welding position. The electrode cap of the welding gun 12 connected to the spot welding robot 11 is attached to the copper block body 1. The welding gun 12 connected to the spot welding robot 11 drives the copper block body 1 to the workpiece. After the welding gun 12 pressurizes the copper block body 1 and the workpiece to make them fully attached, the welding gun 12 indirectly releases the welding current through the copper block welding device, completes the welding of the workpiece, and realizes indirect welding.

[0034] Further, the copper block body 1 is made of chromium-zirconium copper, which has good electrical conductivity, thermal conductivity and high hardness, thereby further improving the stability of the welding strength.

[0035] The copper block welding device is assembled at the corresponding position of the spot welding fixture 13, the welding gun 12 is connected to the copper block body 1 through the pressurized workpiece and the copper block body 1 for electric welding, the welding of the workpiece can be completed in a narrow space, the feasibility of welding is realized, the appearance quality and the stability of the welding strength of the workpiece are met, the special welding gun 12 and the corresponding electrode grinder for coping with the workpiece in the complex narrow space are avoided, the utilization rate of the welding gun 12 is improved, the investment cost of the welding gun 12 and its spare parts is reduced, the structure is simple, the processing is convenient, the project development cycle is shortened, and the work efficiency is improved.

[0036] The copper block welding device is assembled at the corresponding position of the spot welding fixture 13, the welding gun 12 is connected to the copper block body 1 through the pressurized workpiece and the copper block body 1 for electric welding, the welding of the workpiece can be completed in a narrow space, the feasibility of welding is realized, the appearance quality and the stability of the welding strength of the workpiece are met, the special welding gun 12 and the corresponding electrode grinder for coping with the workpiece in the complex narrow space are avoided, the utilization rate of the welding gun 12 is improved, the investment cost of the welding gun 12 and its spare parts is reduced, the structure is simple, the processing is convenient, the project development cycle is shortened, and the work efficiency is improved.

[0037] In actual application, the cooling water pipe 10 is arranged in the copper block body 1, the cooling water pipe 10 is provided with an inlet and an outlet, and is connected to the inlet pipe and the outlet pipe of the workstation water and gas unit 17 through the water nozzle 9, thereby forming a cooling water circulation loop. The inlet of the cooling water pipe 10 is connected to the inlet pipe 15 of the workstation water and gas unit 17 through the water nozzle 9, and the outlet of the cooling water pipe 10 is connected to the outlet pipe 16 of the workstation water and gas unit 17 through the water nozzle 9. During the welding process, the cooling water enters the inlet of the water and gas unit 17 from the inlet of the cooling water machine 14, the cooling water machine 14 is installed outside the workstation fence 18, then enters the inlet of the copper block welding device from the inlet of the water and gas unit 17, then returns to the outlet of the copper block welding device, then returns to the outlet of the water and gas unit 17, and finally returns to the outlet of the cooling water machine 14 from the outlet of the water and gas unit 17, thereby forming a cooling water circulation loop. The heat generated by the copper block is reduced by the circulation of the cooling water in the pipe, so that the welding strength meets the quality requirements of the workpiece and the stability of the welding strength is ensured.

[0038] On the basis of the above-mentioned various embodiments, the cooling water pipe 10 comprises a horizontal pipe, two vertical pipes connected to the inlet and outlet of the horizontal pipe respectively, and a water nozzle 9 connected to the other end of the vertical pipe. The inlet and outlet of the cooling water pipe 10 are arranged on the side walls at both ends of the horizontal pipe, and the two ends of the horizontal pipe are sealed by the thread inserts 8.

[0039] In practical application, the cooling water pipe 10 includes a transverse through pipe and two vertical pipes. The transverse through pipe is a through pipe and is machined for convenience. The two ends of the transverse through pipe are sealed by the gaskets 8 to seal the two ends of the transverse through pipe.

[0040] One of the vertical pipes is a water inlet pipe and the other is a water outlet pipe. The two vertical pipes are respectively connected to the water inlet and outlet of the transverse through pipe at one end and are connected to the water nozzle 9 at the other end. The water inlet and outlet of the cooling water pipe 10 are respectively arranged at the side walls of the two ends of the transverse through pipe, and the vertical pipes are arranged inside the copper block body 1. This can increase the length of the cooling water pipe 10 in the copper block body 1, further reduce the heat generated by the copper block body 1 during welding, and ensure the stability of the appearance quality and welding strength of the workpiece.

[0041] Further, the copper block water inlet pipe and the water outlet pipe are respectively provided with ball valve switches. This facilitates the opening and closing of the cooling water pipe 10 and does not affect the operation of other cooling water pipes.

[0042] In another more reliable embodiment, on the basis of any one of the above embodiments, the connecting assembly includes a first connecting block 2, a second connecting block 3, a third connecting block 4 and a fourth connecting block 5. The fourth connecting block 5 is assembled on the spot welding fixture 13, the third connecting block 4 is assembled on the fourth connecting block 5 and can slide longitudinally and transversely along the fourth connecting block 5, the second connecting block 3 is assembled on the third connecting block 4, the first connecting block 2 is assembled on the second connecting block 3, and the copper block body 1 is placed on the first connecting block 2.

[0043] In practical application, the connecting assembly includes a first connecting block 2, a second connecting block 3, a third connecting block 4 and a fourth connecting block 5. The first connecting block 2, the second connecting block 3, the third connecting block 4 and the fourth connecting block 5 are assembled and connected. Each connecting block has a simple structure and is easy to process.

[0044] Specifically, the lower surface of the fourth connecting block 5 is assembled on the spot welding fixture 13, and the fourth connecting block 5 is fixed relative to the spot welding fixture 13.

[0045] The lower surface of the third connecting block 4 is assembled on the upper surface of the fourth connecting block 5. The third connecting block 4 can slide longitudinally and transversely relative to the fourth connecting block 5. In this way, the longitudinal position and the transverse position of the third connecting block 4 relative to the fourth connecting block 5 can be adjusted.

[0046] The second connecting block 3 is assembled on the third connecting block 4, the first connecting block 2 is assembled on the second connecting block 3, the copper block body 1 is placed on the first connecting block 2, and the plurality of connecting blocks are assembled and connected in a staggered manner according to the narrow space of the electric welding clamp, space is fully utilized, the copper block body 1 is installed at a specific position, and the workpiece is welded; the assembly form of the plurality of connecting blocks can realize adjustment of the longitudinal position and the transverse position of the copper block body 1 relative to the spot welding clamp 13, so that the workpiece is accurately welded.

[0047] On the basis of the above various embodiments, the lower surface of the third connecting block 4 is assembled on the upper surface of the fourth connecting block 5, and an adjusting gasket 7 is arranged between the mating surfaces of the third connecting block 4 and the fourth connecting block 5.

[0048] In actual application, the lower surface of the third connecting block 4 is assembled on the upper surface of the fourth connecting block 5, and the connection is flat and the contact area is large, so the connection stability is good. The adjusting gasket 7 is arranged between the mating surfaces of the third connecting block 4 and the fourth connecting block 5, and the thickness of the adjusting gasket 7 is adjusted to realize the up-down position adjustment of the copper block body 1.

[0049] On the basis of the above various embodiments, the first connecting block 2, the second connecting block 3, the third connecting block 4 and the fourth connecting block 5 are respectively bolted, and the bolt is connected in the connecting hole and the threaded hole of the mating surface;

[0050] The first connecting block 2 and the second connecting block 3, and the second connecting block 3 and the third connecting block 4 are positioned by the positioning pin, and the positioning pin is connected in the positioning hole of the mating surface.

[0051] In actual application, the copper block body 1 is sequentially assembled into the electric welding clamp through the first connecting block 2, the second connecting block 3, the third connecting block 4 and the fourth connecting block 5, and the first connecting block 2, the second connecting block 3, the third connecting block 4 and the fourth connecting block 5 are respectively bolted. The connecting surface of the first connecting block 2, the second connecting block 3, the third connecting block 4 and the fourth connecting block 5 is provided with a threaded hole, and the bolt is connected in the connecting hole and the threaded hole of the mating surface, so that the connection is detachable, convenient and stable.

[0052] The first connecting block 2 and the second connecting block 3, and the second connecting block 3 and the third connecting block 4 are positioned by the positioning pin, and the connecting surface of the first connecting block 2 and the second connecting block 3 and the connecting surface of the second connecting block 3 and the third connecting block 4 are provided with the positioning hole, and the positioning pin is connected in the positioning hole of the mating surface. The connecting blocks are respectively connected by the positioning pin and the bolt, so as to ensure the accuracy and stability of the position of the copper block body 1.

[0053] Preferably, the positioning pin is a cylindrical positioning pin, the number of positioning holes is two, the threaded hole is located between the two positioning holes, and the two ends are positioned and the middle is fastened, which is accurate in positioning and firm in connection.

[0054] On the basis of the above various embodiments, the diameter of the connecting hole of the third connecting block 4 is greater than the diameter of the corresponding bolt, and the diameter of the threaded hole of the fourth connecting block 5 is equal to the diameter of the bolt.

[0055] In actual application, the diameter of the connecting hole of the third connecting block 4 is greater than the diameter of the corresponding bolt, and the diameter of the threaded hole of the fourth connecting block 5 is equal to the diameter of the bolt. The bolt passes through the connecting hole of the third connecting block 4 and is connected in the threaded hole of the fourth connecting block 5. The connecting hole of the third connecting block 4 can move relative to the position of the bolt and the fourth connecting block 5, so as to adjust the position of the third connecting block 4.

[0056] In the embodiment, the diameter of the connecting hole of the third connecting block 4 is at least 6mm greater than the diameter of the bolt, the diameter of the connecting hole of the third connecting block 4 is increased to Φ15mm, and a large gasket and an M8 bolt are provided, so that the adjustment of ±3mm of the copper block body 1 in front and back and left and right positions can be realized.

[0057] On the basis of the above various embodiments, the outer periphery of the second connecting block 3 is wrapped with an insulating gasket 6, the insulating gasket 6 is attached to the surface of the second connecting block 3, the material of the insulating gasket 6 is bakelite, and the outer sides of the positioning pins and the bolts connecting the first connecting block 2 and the second connecting block 3 are provided with bakelite sleeves.

[0058] In actual application, the insulating gasket 6 is wrapped around the outer periphery of the second connecting block 3, the insulating gasket 6 is attached to the surface of the second connecting block 3, the material of the insulating gasket 6 is bakelite, and the connecting block and the copper block body 1 are insulated by the insulating gasket 6, so as to avoid shunt during welding and cause insufficient welding strength.

[0059] At the same time, the outer sides of the positioning pins of the first connecting block 2 and the second connecting block 3 are inlaid with bakelite sleeves, and the outer sides of the bolts are provided with bakelite sleeves, so as to realize the insulation between the connecting block and the copper block body 1 while ensuring the installation positioning and fastening, and avoid shunt during welding.

[0060] On the basis of the above various embodiments, the first connecting block 2 is provided with a positioning sliding groove, and the copper block body 1 is placed in the positioning sliding groove.

[0061] In actual application, the positioning sliding groove is opened on the first connecting block 2, and the bottom of the copper block body 1 is placed in the positioning sliding groove, so as to position and limit the copper block body 1 and ensure the position, direction and angle of the copper block body 1. The upper part of the copper block body 1 is exposed, which is convenient for the welding gun 12 to be attached to the copper block body 1.

[0062] On the basis of the above various embodiments, the gap between the positioning sliding groove and the copper block body 1 is 0.3mm-0.5mm.

[0063] The positioning sliding groove is provided with steps on both sides.

[0064] In actual application, the positioning sliding groove is larger than the copper block body 1, and the copper block body 1 is placed in the positioning sliding groove, and the gap between the positioning sliding groove and the copper block body 1 is provided, which is convenient for placing the copper block body 1 in the positioning sliding groove, and can better limit the copper block body 1, preventing the copper block body 1 from tilting.

[0065] Preferably, the gap between the positioning sliding groove and the copper block body 1 is any value between 0.3mm-0.5mm, including the end value, such as 0.4mm, which realizes that the copper block can float inside the sliding groove during welding, ensures that the copper block is in contact with the workpiece and the electrode cap of the welding gun 12 during welding, and further improves the stability of the welding strength.

[0066] Further, the positioning sliding groove is provided with steps on both sides, such as the step height of 3mm, preventing the copper block body 1 from falling.

[0067] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0068] The copper block welding device provided by the present application is described in detail above. The principles and implementation modes of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application. Therefore, the present application will not be limited to the embodiments shown in this paper, but will be consistent with the widest range of principles and novel features disclosed in this paper.

Claims

1. A copper block welding apparatus characterized by comprising: The utility model relates to a copper block body (1) and a connecting assembly assembled on a spot welding fixture (13), the copper block body (1) is detachably connected to the connecting assembly and insulated from the spot welding fixture (13), and when welding, the electrode cap of a welding gun (12) connected to a spot welding robot (11) is attached to the copper block body (1), so that the welding of workpieces can be completed in a narrow space, The connecting assembly comprises a first connecting block (2), a second connecting block (3), a third connecting block (4) and a fourth connecting block (5), the fourth connecting block (5) is assembled on the spot welding fixture (13), the third connecting block (4) is assembled on the fourth connecting block (5) and can slide longitudinally and transversely along the fourth connecting block (5), the second connecting block (3) is assembled on the third connecting block (4), the first connecting block (2) is assembled on the second connecting block (3), the copper block body (1) is placed on the first connecting block (2), the lower surface of the third connecting block (4) is assembled on the upper surface of the fourth connecting block (5), adjustment shims (7) are arranged between the fitting surfaces of the third connecting block (4) and the fourth connecting block (5), a positioning sliding groove is arranged on the first connecting block (2), the copper block body (1) is placed in the positioning sliding groove, and the gap between the positioning sliding groove and the copper block body (1) is 0.3mm-0.5mm; steps are arranged on the two sides of the positioning sliding groove.

2. The copper mass welding apparatus according to claim 1, characterized by The copper block body (1) is provided with a cooling water pipe (10), and the water inlet and the water outlet of the cooling water pipe (10) are respectively connected with the water inlet pipeline and the water outlet pipeline of a workstation water and gas unit (17) through water nozzles (9).

3. The copper mass welding apparatus according to claim 2, characterized in that, The cooling water pipe (10) comprises a transverse through pipe, two vertical pipes connected with the water inlet and the water outlet of the transverse through pipe respectively, and the other ends of the vertical pipes are connected with the water nozzles (9); the water inlet and the water outlet of the cooling water pipe (10) are arranged on the side walls at the two ends of the transverse through pipe, and the two ends of the transverse through pipe are sealed through a thread protector (8).

4. The copper mass welding apparatus of claim 1, wherein The first connecting block (2), the second connecting block (3), the third connecting block (4) and the fourth connecting block (5) are respectively connected through bolts, and the bolts are connected in the connecting holes and the threaded holes of the fitting surfaces; The first connecting block (2) and the second connecting block (3) and the second connecting block (3) and the third connecting block (4) are positioned through positioning pins, and the positioning pins are connected in the positioning holes of the fitting surfaces.

5. The copper mass welding apparatus according to claim 4, characterized in that The diameter of the connecting hole of the third connecting block (4) is greater than the diameter of the corresponding bolt, and the diameter of the threaded hole of the fourth connecting block (5) is equal to the diameter of the bolt.

6. The copper mass welding apparatus of claim 1, wherein The outer periphery of the second connecting block (3) is wrapped with an insulating shim (6), the insulating shim (6) is attached to the surface of the second connecting block (3), the material of the insulating shim (6) is bakelite, and the outer sides of the positioning pins and the bolts connecting the first connecting block (2) and the second connecting block (3) are provided with bakelite sleeves.

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