CN220838365U - Welding gun assembly and sheet butt joint high-speed welding system - Google Patents

Abstract

The utility model provides a welding gun assembly and a high-speed butt welding system for thin plates. The copper pipe is spirally wound and arranged on the gun neck near the nozzle, and is provided with an inlet and an outlet, wherein the inlet is used for being connected with cooling fluid to cool the welding gun. The copper pipe has a diameter of 2-8 mm, the copper pipe with a smaller diameter has better plasticity, can be better clung to the welding gun during winding, increases the contact surface area with the welding gun, and forms good supercooling and heat removal conditions. The copper pipe is tightly wound on the outer surface of the welding gun for a plurality of circles, and the winding gap enclosed by the two adjacent circles of copper pipes and the outer surface of the welding gun is filled with a heat dissipation piece, so that the heat dissipation piece can play a role in fixing the copper pipe and increasing the heat dissipation area, and the cooling effect on the welding gun is improved.

Description

Welding gun assembly and sheet butt joint high-speed welding system

Technical Field

The present utility model relates generally to the field of welding devices, and more particularly to a welding gun assembly and sheet butt welding system.

Background

The welding gun is characterized in that heat generated by high current and high voltage of the welding machine is collected at the terminal of the welding gun, welding wires are melted, the melted welding wires permeate into a part to be welded, objects to be welded are firmly connected into a whole after being cooled, the heat generated by the welding gun is required to be cooled and released in the welding process, and water cooling is adopted in the related technology to cool the welding gun. The welding gun is generally cylindrical in shape, the cooling device is not easy to fix, and the gap between the welding gun and the cooling device causes difficulty in releasing heat.

The roof and front wall panels of a container are typically made of relatively thin carbon steel sheets and it is often necessary to splice the sheets together by welding techniques to meet the dimensional requirements of the container. In the production process of a container, after the thin plates are welded by adopting an automatic welding device, the thin plates are transported to a final assembly area for final assembly, but in the related technology, welding wires are easily heated and expanded by high-frequency and long-time welding operation during the production operation of the thin plates, so that the conditions of unsmooth wire discharge, blockage of a conductive nozzle and the like are caused, the welding efficiency and quality of the thin plates are influenced, and the yield and quality of finished boxes of the container are influenced.

Accordingly, there is a need to provide a welding gun assembly and sheet butt high speed welding system that at least partially addresses the above-described problems.

Disclosure of utility model

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the utility model is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, a first aspect of the present utility model provides a welding gun assembly comprising:

The welding gun comprises a nozzle and a gun neck which are connected; and

The copper pipe is spirally wound on the gun neck close to the nozzle and is provided with an inlet and an outlet, and the inlet is used for being connected with cooling fluid to cool the welding gun;

The diameter of the copper pipe is 2-8 mm, the copper pipe is tightly wound on the outer surface of the welding gun for a plurality of circles, and a winding gap enclosed by the copper pipe and the outer surface of the welding gun for two adjacent circles is filled with a heat dissipation piece.

Optionally, the wall thickness of the copper pipe is 0.3 mm-0.6 mm.

Alternatively, the diameter of the copper tube is 3mm and the wall thickness of the copper tube is 0.5mm.

A second aspect of the present utility model provides a sheet metal butt-welding system comprising:

The welding device comprises a rack, wherein the rack is provided with a guide sliding rail, and the guide sliding rail is arranged in an extending manner along the welding direction;

The feeding assembly is positioned vertically below the guide sliding rail and is used for conveying the sheet to be welded to a welding target position;

A cooling system tank storing a cooling liquid; and

A welding device, the welding device comprising:

a slider movably connected to the guide rail;

A telescoping arm connected to the slider; and

According to the welding gun assembly in the first aspect of the utility model, the welding gun assembly is connected to one end of the telescopic arm, which is far away from the sliding block, the inlet is communicated with the cooling system box through a liquid inlet pipe, and the outlet is communicated with the cooling system box through a liquid return pipe;

The telescopic arm is configured to drive the welding gun to extend and retract in the vertical direction, so that the welding gun is close to or far away from a welding target position.

Optionally, the welding device further comprises:

Welding machine;

a power source electrically connected to the welding gun, the welding machine, and the cooling system box;

A welding wire having a diameter of 0.8mm and a wire feeder, the welding wire being connected to the welding gun by the wire feeder, the wire feeder being electrically connected to the welding machine.

Optionally, the sheet butt welding high-speed welding system further comprises a gas protection device, wherein the gas protection device comprises a mixed gas bag, the mixed gas bag contains mixed shielding gas, and the gas protection device is connected to the welding gun and used for outputting the mixed shielding gas to a welding target position;

The mixed shielding gas is a mixed gas of argon and carbon dioxide, wherein the volume of the carbon dioxide in the mixed gas bag is 7% -11%.

Optionally, the rack comprises two guide sliding rails arranged in parallel; and/or

The telescopic arm is configured as a pneumatic cylinder or a hydraulic cylinder.

Optionally, the sheet butt welding high-speed welding system comprises two groups of welding devices, and the two groups of welding devices are distributed at intervals along the welding direction.

Optionally, the feed assembly comprises:

The transmission device is connected to the rack and used for bearing the thin plate to be welded;

The driving device is connected to the conveying device to drive the conveying device to move relative to the frame so as to convey the thin plates to be welded.

Optionally, the sheet butt-joint high-speed welding system further comprises:

The compressing device is positioned vertically above the conveying device;

The second driving device is connected to the pressing device to drive the pressing device to move relative to the conveying device in the vertical direction so as to press or loosen the thin plates to be welded, which are positioned on the conveying device; and

The jacking assembly is located vertically below the conveying device and comprises a conductive copper bar and a third driving device, and the third driving device is connected to the conductive copper bar to drive the conductive copper bar to move relative to the conveying device along the vertical direction and abut against or separate from a sheet to be welded located on the conveying device.

The utility model provides a welding gun assembly and a sheet butt joint high-speed welding system, wherein a copper pipe is spirally wound outside a welding neck of a welding gun of the welding gun assembly, the diameter of the copper pipe is 2-8 mm, the copper pipe has good plasticity, the copper pipe can be better clung to the welding gun during winding, the contact surface area of the copper pipe and the welding gun is increased, and good supercooling and heat removal conditions are formed. The copper pipe is tightly wound on the outer surface of the welding gun for a plurality of circles, and the winding gap enclosed by the two adjacent circles of copper pipes and the outer surface of the welding gun is filled with a heat dissipation piece, so that the heat dissipation piece can play a role in fixing the copper pipe and increasing the heat dissipation area, and the cooling effect on the welding gun is improved.

Drawings

The following drawings of embodiments of the present utility model are included as part of the utility model. Embodiments of the present utility model and their description are shown in the drawings to explain the principles of the utility model. In the drawings of which there are shown,

FIG. 1 is a schematic illustration of a sheet metal butt-welding system according to a preferred embodiment of the present utility model; and

Fig. 2 is a schematic perspective view of a welding gun assembly according to a preferred embodiment of the present utility model, only partially shown.

Reference numerals illustrate:

100: sheet butt-welding system 110: rack

111: Guide rail 120: feeding assembly

121: Transmission device 122: first driving device

131: Compression device 132: second driving device

133: Conductive copper bar 134: grounding wire

135: Third driving device 140: welding device

141: The slide block 142: telescopic arm

150: Welding gun assembly 151: welding gun

151A: nozzle 151b: gun neck

152: Copper tube 152a: inlet port

152B: outlet 152c: winding gap

160: Power supply cabinet 161: cooling system box

161A: feed pipe 161b: liquid return pipe

162: Welding machine 163: wire feeder

164: Welding wire 165: gas protection device

171: Transmission power supply box 172: welding control box

D: welding direction

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that embodiments of the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the embodiments of the utility model.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the present utility model. It will be apparent that embodiments of the utility model may be practiced without limitation to the specific details that are set forth by those skilled in the art. The preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to the detailed description, and should not be construed as limited to the embodiments set forth herein.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model, as the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like are used herein for illustrative purposes only and are not limiting.

Ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".

In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used merely to indicate relative positional relationships between the relevant portions, and do not limit the absolute positions of the relevant portions.

Herein, "equal," "same," etc. are not strictly mathematical and/or geometric limitations, but also include deviations that may be appreciated by those skilled in the art and allowed by fabrication or use, etc.

Unless otherwise indicated, numerical ranges herein include not only the entire range within both of its endpoints, but also the several sub-ranges contained therein.

Hereinafter, specific embodiments of the present utility model will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present utility model and not limit the present utility model.

Referring to fig. 1 and 2, a welding gun assembly 150 and a sheet butt welding system 100 are shown in accordance with an embodiment of the present utility model.

Wherein, welding gun assembly 150 includes welding gun 151 and copper tube 152, welding gun 151 includes nozzle 151a and rifle neck 151b that are connected. The copper tube 152 is spirally wound on the gun neck 151b near the nozzle 151a, and the copper tube 152 is provided with an inlet 152a and an outlet 152b, wherein the inlet 152a is used for being connected with cooling fluid to cool the welding gun 151.

The diameter of the copper pipe 152 is 2 mm-8 mm, the copper pipe 152 is tightly wound on the outer surface of the welding gun 151 for a plurality of circles, and a winding gap 152c enclosed by two circles of adjacent copper pipes 152 and the outer surface of the welding gun 151 is filled with a heat dissipation piece.

The heat sink may function to fix the copper pipe 152 and further increase the heat dissipation area, improving the cooling effect on the welding gun 151. The welding gun assembly 150 can avoid the occurrence of conditions such as thermal expansion, unsmooth wire outlet, blockage of a contact tip and the like of the welding wire 164 caused by poor heat radiation when being used for high-frequency and long-time welding operation.

In the present embodiment, the copper pipe 152 is provided at the position of the gun neck 151b, and the positions of the copper pipe 152 and the welding gun 151 can be maintained in a relatively fixed state all the time. The gap is convenient to complete in welding operation, and an operator removes and cleans the nozzle 151a of the welding gun 151 to splash welding slag inside, so that welding air holes are prevented from being generated due to the blockage inside the nozzle. If the copper pipe is provided at the nozzle 151a, cleaning of the nozzle 151a is inconvenient.

Illustratively, the diameter of the copper tube 152 may be selected to be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm.

Illustratively, the copper tube 152 has a wall thickness of 0.3mm to 0.6mm. The smaller the wall thickness, the better the plasticity of the copper tube 152, and the better the adhesion to the welding gun 151 during winding. It will be appreciated that the smaller diameter copper tube 152, the winding gap 152c defined by the outer surfaces of the adjacent two turns of copper tube 152 and the welding gun 151 is also smaller. The position of the winding gap 152c is shown in fig. 2. In this embodiment, the diameter of the copper tube 152 is 3mm, and the wall thickness of the copper tube 152 is 0.5mm.

Illustratively, the heat sink may be a metallic material. In this embodiment, the heat sink is metallic tin. The metallic tin may be, for example, soldered to copper tube 152. The contact surface between the copper pipe 152 and the welding gun 152 is further enlarged through the heat radiating piece, so that heat of the gun neck 151b is better conducted to the copper pipe 152, and the heat radiating efficiency is improved.

As shown in fig. 1, a sheet metal butt welding system 100 of an embodiment of the present utility model includes a frame 110, a feed assembly 120, a cooling system box 161, and a welding apparatus 140. The welding device 140 includes a welding gun assembly 150 of the present utility model.

Specifically, the frame 110 is provided with a guide rail 111, and the guide rail 111 extends along the welding direction D. The feeding assembly 120 is located vertically below the guide rail 111 for conveying the sheet to be welded to the welding target position.

The cooling system tank 161 stores cooling liquid, and an inlet 152a of the copper pipe 152 is communicated with the cooling system tank 161 through a liquid inlet pipe 161a, and an outlet 152b of the copper pipe 152 is communicated with the cooling system tank 161 through a liquid return pipe 161 b. It will be appreciated that the cooling system tank 161 delivers cooling fluid to the copper tube 152 via the fluid inlet line 161a, and cools the welding gun 151, after which fluid is returned to the cooling system tank 161 via the fluid return line 161 b. Illustratively, a pump, a refrigerating/heat dissipating device, etc. may be provided in the cooling system case 161, wherein the pump is a power device for circulating and returning the cooling liquid, and the liquid returned into the cooling system case 161 is cooled again by the refrigerating/heat dissipating device for recycling. According to another example of the present utility model, a temperature detecting device may be further provided to detect the temperature of the welding gun 151, and when the detected temperature exceeds a preset safety range, the cooling system box 161 may be correspondingly adjusted/operated to cool the welding gun 151.

The welding device 140 further comprises a slide 141 and a telescopic arm 142. The slider 141 is movably connected to the guide rail 111. The telescopic arm 142 is connected to the slider 141. The welding gun assembly 150 is connected to an end of the telescoping arm 142 remote from the slide 141. Wherein, the telescopic arm 142 is configured to be able to drive the welding gun 151 to be telescopic in the vertical direction so that the welding gun 151 is close to or far from the welding target position. For example, the telescopic arm 142 may be configured as a pneumatic cylinder or a hydraulic cylinder. When the slide block 141 moves along the guide slide rail 111, the telescopic arm 142 and the welding gun 151 are driven to move along the welding direction D, so that the welding operation at the welding target position can be realized.

Preferably, as shown in fig. 1, the frame 110 includes two guide rails 111 arranged in parallel, so as to ensure that the welding device 140 can move smoothly along the guide rails 111.

Referring to fig. 1, in this embodiment, the sheet metal butt high speed welding system 100 further includes a welding control box 172, a welder 162, a power cabinet 160, a welding wire 164, and a wire feeder 163. The welding wire 164 is connected to the welding gun 151 by a wire feeder 163, and the wire feeder 163 is electrically connected to the welding machine 162. The welding gun 151 is electrically connected to a welding control box 172, and the welding control box 172, the welder 162, and the cooling system box 161 are electrically connected to a power supply cabinet 160, respectively, and the power supply cabinet 160 is used to supply electric power.

The sheet metal butt high speed welding system 100 also includes a gas shield 165, the gas shield 165 including a gas mixture package containing a mixed shielding gas, the gas shield 165 being connected to the welding gun 151 and configured to output the mixed shielding gas to a welding target location.

Preferably, the mixed shielding gas is a mixed gas of argon and carbon dioxide, wherein the volume of the carbon dioxide gas in the mixed gas bag is 7% -11%. Illustratively, the carbon dioxide gas may be present in a volume content of 7%, 8%, 9%, 10%, 11%. For example, when the volume content of the carbon dioxide gas is 7%, the volume content of the argon gas is 93%; when the volume content of the carbon dioxide gas was 11%, the volume content of the argon gas was 89%.

The volume content ratio of argon and carbon dioxide in the mixed gas bag can solve the problems that the arc is unstable and jet transition is difficult to realize due to the too high content of carbon dioxide on the premise of ensuring that the arc of the argon is stable, splashing is small and drop-shaped transition is easy to obtain.

Preferably, the diameter of the wire 164 is 0.8mm. The use of a smaller diameter wire 164 in this embodiment is advantageous in reducing critical currents affecting abrupt changes compared to a typical 1.2mm diameter wire 164. In other words, in the utility model, the critical current of the transition from the molten drop to the jet is affected by adjusting the diameter of the welding wire 164 and the proportion of the components of the mixed shielding gas, so that the aims of avoiding abnormal welding and improving the welding efficiency are fulfilled.

In practical applications of the sheet butt welding system 100, it was found that when the carbon dioxide content is less than 7%, the welding penetration is incomplete, resulting in a welding rate that does not meet the technical specification requirements, and when the carbon dioxide content is greater than 11%, the welding will generate more spatter. Therefore, according to the sheet butt high-speed welding system 100, the welding quality can be ensured, the weld formation can be effectively ensured, and the welding speed can be improved by adopting the welding wire with the thickness of 0.8mm and the carbon dioxide with the thickness of 7% -11% (corresponding to the argon content of 89% -93%).

Preferably, in the present embodiment, the mixed shielding gas includes 90% by volume of argon gas and 10% by volume of carbon dioxide gas.

Preferably, the sheet metal butt welding system 100 includes two sets of welding apparatus 140, the two sets of welding apparatus 140 being spaced apart along the welding direction D. The two sets of welding devices 140 can simultaneously perform welding operation, thereby improving welding efficiency.

The sheet butt welding system 100 of the embodiment is applied to a container production and manufacturing process, and when welding a top plate, a front wall plate and the like, the welding speed can be increased to 1.35m/min (from 0.9m/min to 1.35 m/min), so that the welding efficiency is greatly improved.

According to one example, the feeding assembly 120 comprises a conveyor 121 and a first drive 122, the conveyor 121 being connected to the frame 110 for carrying the sheets to be welded. The first driving device 122 is connected to the conveying device 121 to drive the conveying device 121 to move relative to the frame 110 so as to convey the sheet to be welded. Specifically, during the welding operation, the thin plate is conveyed to the welding target position by the conveying device 121, and then the welding gun 151 is moved to weld the thin plate. It can also be transported outwards from the welding target location by means of the transport device 121 after the welding is completed. The person skilled in the art can flexibly select the transmission means 121 according to the actual situation.

As shown in fig. 1, in the present embodiment, the sheet butt welding system 100 further includes and transmits a power box 171, wherein the power box 171 is used to control the feeding assembly 120 to transmit the sheet to be welded. In fig. 1, the transmission power box 171 can also provide power to the first drive 122 and the welding control box 172.

For example, the transmission power supply box 171 may enable control of the feeding set 120 by being electrically connected to the first driving device 122 and controlling the opening and closing of the first driving device 122. The first driving device 122 may be a motor, for example.

With continued reference to fig. 1, the sheet metal butt welding system 100 also includes a hold down device 131 and a second drive 132. The pressing device 131 is located vertically above the conveying device 121. The second driving means 132 is connected to the pressing means 131, and the second driving means 132 is capable of driving the pressing means 131 to move in a vertical direction with respect to the conveying means 121, so that the pressing means 131 presses or releases the sheet to be welded located at the conveying means 121. The second driving device 132 may be a motor, for example.

As shown in fig. 1. The sheet metal butt seam system 100 also includes a jacking assembly disposed vertically below the transfer device 121. The jack-up assembly includes a conductive copper bar 133 and a third driving device 135, the conductive copper bar 133 being connected to an output terminal of the third driving device 135. The conductive copper bar 133 is connected to a ground line 134. The third driving device 135 can drive the conductive copper bar 133 to move relative to the transmission device 121 along the vertical direction, so as to enable the conductive copper bar 133 to abut against or separate from the thin plate to be welded located on the transmission device 121. The conductive copper bar 133 has good conductivity, and can promote melting of the wire 164. The third driving device 135 may be a motor, for example.

In fig. 1, two second driving devices 132 and two third driving devices 135 are provided to ensure that the pressing device 131 and the conductive copper bars 133 can move smoothly in the vertical direction. Illustratively, a second drive 132 and two third drives 135 may be connected to the frame 110.

Referring to fig. 1, the operation of the sheet metal butt-welding system 100 of the present utility model includes:

The conveying device 121 conveys the sheet to be welded to the welding target position under the drive of the first driving device 122;

the pressing device 131 moves downwards and presses the thin plate to be welded under the drive of the second driving device 132;

The third driving device 135 drives the conductive copper bar 133 to abut against the sheet to be welded;

The welding gun assembly 150 moves along the guide rail 111 and welds the underlying sheet to be welded under the control of the welding control box 172.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the utility model. Terms such as "disposed" or the like as used herein may refer to either one element being directly attached to another element or one element being attached to another element through an intermediate member. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features unless the features are not applicable or otherwise indicated in the other embodiment.

The present utility model has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. Those skilled in the art will appreciate that many variations and modifications are possible in light of the teachings of the utility model, which variations and modifications are within the scope of the utility model as claimed.

Claims (10)

1. A welding gun assembly, the welding gun assembly comprising:

The welding gun comprises a nozzle and a gun neck which are connected; and

The copper pipe is spirally wound on the gun neck close to the nozzle and is provided with an inlet and an outlet, and the inlet is used for being connected with cooling fluid to cool the welding gun;

The diameter of the copper pipe is 2-8 mm, the copper pipe is tightly wound on the outer surface of the welding gun for a plurality of circles, and a winding gap enclosed by the copper pipe and the outer surface of the welding gun for two adjacent circles is filled with a heat dissipation piece.

2. The welding gun assembly as recited in claim 1, wherein,

The wall thickness of the copper pipe is 0.3 mm-0.6 mm.

3. The welding gun assembly as defined in claim 2, wherein the copper tube has a diameter of 3mm and a wall thickness of 0.5mm.

4. A sheet metal butt-welding system, the sheet metal butt-welding system comprising:

The welding device comprises a rack, wherein the rack is provided with a guide sliding rail, and the guide sliding rail is arranged in an extending manner along the welding direction;

The feeding assembly is positioned vertically below the guide sliding rail and is used for conveying the sheet to be welded to a welding target position;

A cooling system tank storing a cooling liquid; and

A welding device, the welding device comprising:

a slider movably connected to the guide rail;

A telescoping arm connected to the slider; and

A welding gun assembly according to any one of claims 1 to 3, connected to an end of the telescopic arm remote from the slide, the inlet communicating with the cooling system tank via a feed-in pipe, the outlet communicating with the cooling system tank via a return pipe;

The telescopic arm is configured to drive the welding gun to extend and retract in the vertical direction, so that the welding gun is close to or far away from a welding target position.

5. The sheet metal butt-welding system of claim 4, wherein the welding apparatus further comprises:

Welding machine;

a power source electrically connected to the welding gun, the welding machine, and the cooling system box;

A welding wire having a diameter of 0.8mm and a wire feeder, the welding wire being connected to the welding gun by the wire feeder, the wire feeder being electrically connected to the welding machine.

6. The sheet metal butt welding system of claim 4, further comprising a gas shield comprising a gas mixture package containing a mixed shielding gas, the gas shield connected to the welding gun and configured to output the mixed shielding gas to a welding target location;

The mixed shielding gas is a mixed gas of argon and carbon dioxide, wherein the volume of the carbon dioxide in the mixed gas bag is 7% -11%.

7. The sheet metal butt-welding system of claim 4, wherein the frame comprises two guide rails arranged in parallel; and/or

The telescopic arm is configured as a pneumatic cylinder or a hydraulic cylinder.

8. The sheet metal butt-welding system of claim 4, wherein,

The sheet butt-joint high-speed welding system comprises two groups of welding devices, and the two groups of welding devices are distributed at intervals along the welding direction.

9. The sheet metal butt-welding system of claim 4, wherein the feed assembly comprises:

The transmission device is connected to the rack and used for bearing the thin plate to be welded;

The driving device is connected to the conveying device to drive the conveying device to move relative to the frame so as to convey the thin plates to be welded.

10. The sheet metal butt welding system of claim 9, further comprising:

The compressing device is positioned vertically above the conveying device;

The second driving device is connected to the pressing device to drive the pressing device to move relative to the conveying device in the vertical direction so as to press or loosen the thin plates to be welded, which are positioned on the conveying device; and

The jacking assembly is located vertically below the conveying device and comprises a conductive copper bar and a third driving device, and the third driving device is connected to the conductive copper bar to drive the conductive copper bar to move relative to the conveying device along the vertical direction and abut against or separate from a sheet to be welded located on the conveying device.