A power battery side plate welding device and a welding method

Abstract

The application belongs to the field of power batteries, and particularly relates to a power battery side plate welding device and a welding method. The existing welding is directly carried out by a welding gun, and the welding effect is poor. When welding side plates of different sizes, the fixing of the side plates needs the help of different tools. The present application provides the following scheme, which comprises a welding gun, a welding plate and a side plate body. One side of the welding plate is fixedly connected with a bottom plate. The side plate body is placed on the bottom plate and located at one side of the welding plate. The welding gun is arranged at one side of the welding plate. The top of the bottom plate is fixedly connected with two fixed plates arranged symmetrically. In the application, different sizes of side plates can be pressed between the outer plate and the welding plate through the arrangement of the pressing plate, and the application range is wider. The stability of the pressing plate is ensured through the clamping of the gap between the protruding block and the corresponding fixed block. The arrangement of the welding seam can ensure that the walking path of the welding gun is a straight line, and the arrangement of the arc surface can facilitate the placement of the welding gun.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a power battery side plate welding device and welding method. BACKGROUND

[0002] Power battery is a power source for providing power for tools, and is mainly used for providing power for electric vehicles, electric trains, electric bicycles and golf carts. It is mainly different from the starting battery used for starting the engine of the automobile. It is mainly used for valve sealing type lead-acid battery, open type pipe type lead-acid battery and lithium iron phosphate battery. On July 31, 2018, the national monitoring and power battery recycling and tracing comprehensive management platform for new energy vehicles was started in Beijing.

[0003] The power battery side plate needs to be welded by a welding device during processing. The existing welding device has the following defects:

[0004] 1. Directly welding by a welding gun, the welding path cannot be controlled, and the worker needs to weld according to experience, and the welding effect is poor;

[0005] 2. When welding side plates of different sizes, the fixing of the side plates needs to use different tools, the operation is more complicated, and the adaptation range is small.

[0006] In view of the above problems, the present application provides a power battery side plate welding device and welding method. SUMMARY

[0007] The present application provides a power battery side plate welding device and welding method, which solves the problems in the prior art that the welding path cannot be controlled by directly welding by a welding gun, the worker needs to weld according to experience, the welding effect is poor, and when welding side plates of different sizes, the fixing of the side plates needs to use different tools, the operation is more complicated, and the adaptation range is small.

[0008] The present application provides the following technical scheme:

[0009] A power battery side plate welding device, comprising a welding gun, a welding plate and a side plate body, one side of the welding plate is fixedly connected with a bottom plate, the side plate body is placed on the bottom plate and located at one side of the welding plate, the welding gun is arranged at one side of the welding plate, the top of the bottom plate is fixedly connected with two fixed plates arranged symmetrically, the top of the bottom plate is slidably connected with a pressing plate, a plurality of first springs are fixedly connected between the pressing plate and the fixed plate, a welding seam is formed in the top of the welding plate, and a gas supply assembly for providing protective gas is arranged in the welding plate.

[0010] The inside of the pressing plate is provided with a second mounting slot, and the inside of the second mounting slot is provided with a clamping assembly for clamping the side plate body.

[0011] The top of the bottom plate is provided with a first mounting slot, and the inside of the first mounting slot is provided with a brake assembly for braking the pressing plate.

[0012] In a possible design, the air supply assembly comprises a U-shaped cavity formed in the welding plate, the bottom inner wall of the inner wall on both sides of the welding seam is provided with a plurality of air outlet holes, the air outlet holes are in communication with the U-shaped cavity, the bottom of the welding plate is fixedly connected with an air inlet pipe in communication with the U-shaped cavity.

[0013] In a possible design, the clamping assembly comprises an outer plate slidingly connected to the inner wall of the second mounting slot, a second spring is fixedly connected between the outer plate and the inner wall of one side of the second mounting slot, a third mounting slot is formed in the inner wall of the outer plate, an inner plate is slidingly connected to the inner wall of the third mounting slot, and a compression spring is fixedly connected between the top of the inner plate and the top inner wall of the third mounting slot.

[0014] In a possible design, the clamping assembly further comprises a protrusion fixedly connected to the bottom of the inner plate, the bottom of the pressing plate is provided with a second rectangular hole matched with the inner plate, and the protrusion is located in the second rectangular hole.

[0015] In a possible design, the brake assembly comprises a plurality of fixing blocks fixedly connected to one side of the first mounting slot, the gap between the fixing blocks is matched with the protrusion, a sliding block is slidingly connected to the bottom inner wall of the first mounting slot, a triangular block is fixedly connected to one side of the sliding block, the triangular block is matched with the protrusion, and two tension springs are fixedly connected between one side of the sliding block and the inner wall of one side of the first mounting slot.

[0016] In a possible design, one side of the second mounting slot is provided with a first rectangular hole, a pushing plate is slidingly connected to the inside of the first rectangular hole, and one end of the pushing plate is fixedly connected to one side of the sliding block.

[0017] In a possible design, one side of the welding seam is provided with two arc surfaces.

[0018] A welding method of a power battery side plate, specifically comprising the following steps:

[0019] S1, the side plate body is placed on the bottom plate, and the position to be welded of the side plate body is located at one side of the welding seam, at this time, the outer plate is in abutment with the side plate body, and the outer plate extrudes the second spring into the inside of the second mounting groove, at this time, the outer plate is located directly above the second rectangular hole, the inner plate moves vertically downward under the elastic force of the compression spring and extends to the outside of the second rectangular hole, the inner plate drives the protruding block to extend out of the second rectangular hole, the protruding block is clamped in the gap between the corresponding fixed block, the stability of the compression plate is guaranteed, at this time, the device can be suitable for welding side plates of different sizes;

[0020] S2, in the welding process, rare gas is discharged through the air inlet pipe and into the U-shaped cavity, and is discharged from a plurality of air outlet holes, for guaranteeing the welding effect, and meanwhile, the setting of the welding seam can guarantee that the walking path of the welding gun is a straight line, and the setting of the arc surface can facilitate the welding gun to be put in, and the device is more convenient to use;

[0021] S3, when it is needed to release the device from braking, the push plate can be pushed, the push plate drives the sliding block to move transversely, the sliding block drives the triangular block to move transversely, the triangular block drives the protruding block to move vertically upward, the protruding block drives the inner plate to move vertically upward, the inner plate extrudes the compression spring and enters the inside of the second rectangular hole, at this time, the compression plate can be moved transversely away from the side plate body, the compression plate can no longer compress the side plate body, and the device is convenient for replacing a new side plate body for welding.

[0022] It should be understood that the foregoing general description and the following detailed description are only exemplary and cannot limit the present application.

[0023] In the present application, the side plate body is placed on the bottom plate, and the position to be welded of the side plate body is located at one side of the welding seam, at this time, the outer plate is in abutment with the side plate body, and the outer plate extrudes the second spring into the inside of the second mounting groove, at this time, the outer plate is located directly above the second rectangular hole, the inner plate moves vertically downward under the elastic force of the compression spring and extends to the outside of the second rectangular hole, the inner plate drives the protruding block to extend out of the second rectangular hole, the protruding block is clamped in the gap between the corresponding fixed block, the stability of the compression plate is guaranteed, at this time, the device can be suitable for welding side plates of different sizes;

[0024] In the present application, in the welding process, rare gas is discharged through the air inlet pipe and into the U-shaped cavity, and is discharged from a plurality of air outlet holes, for guaranteeing the welding effect, and meanwhile, the setting of the welding seam can guarantee that the walking path of the welding gun is a straight line, and the setting of the arc surface can facilitate the welding gun to be put in, and the device is more convenient to use;

[0025] In the present application, when the device needs to be released, the push plate can be pushed, the push plate drives the sliding block to move transversely, the sliding block drives the triangular block to move transversely, the triangular block pushes the convex block to move vertically upward, the convex block drives the inner plate to move vertically upward, the inner plate extrudes the compression spring and enters the inside of the second rectangular hole, at this time the compression plate can be moved transversely away from the side plate body, the compression plate can no longer compress the side plate body, and the new side plate body is convenient to replace and weld;

[0026] In the present application, the different sizes of the side plate can be compressed between the outer plate and the welding plate through the setting of the compression plate, the application range is wider, the stability of the compression plate is guaranteed through the gap between the convex block and the corresponding fixed block, the setting of the welding seam can guarantee that the walking path of the welding gun is a straight line, the setting of the arc surface can facilitate the welding gun to be put in, and the use is more convenient, and the push plate can release the braking state of the device. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A three-dimensional structure schematic view of a power battery side plate welding equipment from a first perspective provided by the embodiment of the present application is provided.

[0028] Figure 2 A three-dimensional structure schematic view of a power battery side plate welding equipment from a second perspective provided by the embodiment of the present application is provided.

[0029] Figure 3 A three-dimensional structure schematic view of a bottom plate in a power battery side plate welding equipment provided by the embodiment of the present application is provided.

[0030] Figure 4 A structure schematic view of a welding plate in a power battery side plate welding equipment provided by the embodiment of the present application is provided.

[0031] Figure 5 A structure schematic view of a compression plate in a power battery side plate welding equipment provided by the embodiment of the present application is provided.

[0032] Figure 6 A side view schematic view of a compression plate in a power battery side plate welding equipment provided by the embodiment of the present application is provided.

[0033] Figure 7 A three-dimensional schematic view of an outer plate in a power battery side plate welding equipment provided by the embodiment of the present application is provided.

[0034] REFERENCE SIGNS:

[0035] 1, welding plate; 2, bottom plate; 3, side plate body; 4, fixed plate; 5, arc surface; 6, weld; 7, gas outlet hole; 8, gas inlet pipe; 9, push plate; 10, first spring; 11, compression plate; 12, first mounting groove; 13, tension spring; 14, first rectangular hole; 15, sliding block; 16, fixed block; 17, triangular block; 18, U-shaped cavity; 19, outer plate; 20, second rectangular hole; 21, protrusion; 22, second mounting groove; 23, inner plate; 24, compression spring; 25, second spring; 26, third mounting groove; 27, welding gun. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0037] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connection", "installation" should be understood in a broad sense, for example, "connection" can be detachable connection, or can be non-detachable connection, can be direct connection, or can be indirect connection through intermediate medium. In addition, "communication" can be direct communication, or can be indirect communication through intermediate medium. Among them, "fixing" means connecting with each other and the relative position relationship after connection does not change. The orientation language mentioned in the embodiments of the present application, such as "inner", "outer", "top", "bottom", etc., is only the direction of the drawings, therefore, the orientation language used is for better and clearer description and understanding of the embodiments of the present application, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0038] In the embodiments of the present application, the terms "first", "second" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0039] In the embodiments of the present application, "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0040] Reference to "one embodiment" or "some embodiments" or "one implementation" or "some implementations" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in some embodiments" or "in one implementation" or "in some implementations" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily referring to some, but not all, embodiments. The terms "including," "comprising," "having" and variations thereof are meant to encompass the items listed thereafter, but do not exclude other items from being present.

[0041] Embodiment 1

[0042] With reference to Figures 1-7 A power battery side plate welding device, comprising a welding gun 27, a welding plate 1 and a side plate body 3, one side of the welding plate 1 is fixedly connected with a bottom plate 2, the side plate body 3 is placed on the bottom plate 2 and located at one side of the welding plate 1, the welding gun 27 is arranged at one side of the welding plate 1, the top of the bottom plate 2 is fixedly connected with two fixed plates 4 arranged symmetrically, the top of the bottom plate 2 is slidably connected with a pressing plate 11, a plurality of first springs 10 are fixedly connected between the pressing plate 11 and the fixed plate 4, the top of the welding plate 1 is provided with a weld 6, the inside of the welding plate 1 is provided with a gas supply assembly for providing protective gas, the gas supply assembly comprises a U-shaped cavity 18 arranged in the inside of the welding plate 1, the bottom inner wall of the inner wall on both sides of the weld 6 is provided with a plurality of gas outlets 7, the gas outlets 7 are in communication with the U-shaped cavity 18, and the bottom of the welding plate 1 is fixedly connected with an air inlet pipe 8 in communication with the U-shaped cavity 18;

[0043] The inside of the pressing plate 11 is provided with a second installation groove 22, the inside of the second installation groove 22 is provided with a clamping assembly for clamping the side plate body 3, the clamping assembly comprises an outer plate 19 slidably connected to the inner wall of the second installation groove 22, the same second spring 25 is fixedly connected between the outer plate 19 and the inner wall of the second installation groove 22, the inner wall of the outer plate 19 is provided with a third installation groove 26, the inner wall of the third installation groove 26 is slidably connected with an inner plate 23, the same compression spring 24 is fixedly connected between the top of the inner plate 23 and the top inner wall of the third installation groove 26, and the clamping assembly further comprises a protruding block 21 fixedly connected to the bottom of the inner plate 23. The bottom of the pressing plate 11 is provided with a second rectangular hole 20 matched with the inner plate 23, and the protruding block 21 is located in the inside of the second rectangular hole 20;

[0044] The top of the bottom plate 2 is provided with a first mounting slot 12, the inside of the first mounting slot 12 is provided with a brake assembly for braking the pressing plate 11, the brake assembly comprises a plurality of fixed blocks 16 fixedly connected on one side of the first mounting slot 12, the gap between the plurality of fixed blocks 16 is matched with the protruding block 21, the bottom inner wall of the first mounting slot 12 is slidably connected with a sliding block 15, one side of the sliding block 15 is fixedly connected with a triangular block 17, the triangular block 17 is matched with the protruding block 21, and the two symmetrically arranged tension springs 13 are fixedly connected between one side of the sliding block 15 and the inner wall of one side of the first mounting slot 12.

[0045] Embodiment 2

[0046] With reference to Figures 1-7 A power battery side plate welding equipment, comprising a welding gun 27, a welding plate 1 and a side plate body 3, one side of the welding plate 1 is fixedly connected with a bottom plate 2, the side plate body 3 is placed on the bottom plate 2 and located at one side of the welding plate 1, the welding gun 27 is arranged at one side of the welding plate 1, the top of the bottom plate 2 is fixedly connected with two symmetrically arranged fixed plates 4, the top of the bottom plate 2 is slidably connected with a pressing plate 11, a plurality of first springs 10 are fixedly connected between the pressing plate 11 and the fixed plate 4, the top of the welding plate 1 is provided with a weld 6, the inside of the welding plate 1 is provided with a gas supply assembly for providing protective gas, the gas supply assembly comprises a U-shaped cavity 18 arranged in the inside of the welding plate 1, the bottom inner wall of the inner wall of both sides of the weld 6 is provided with a plurality of gas outlets 7, the gas outlets 7 are in communication with the U-shaped cavity 18, and the bottom of the welding plate 1 is fixedly connected with an air inlet pipe 8 in communication;

[0047] The inside of the pressing plate 11 is provided with a second mounting slot 22, the inside of the second mounting slot 22 is provided with a clamping assembly for clamping the side plate body 3, the clamping assembly comprises an outer plate 19 slidably connected with the inner wall of the second mounting slot 22, the same second spring 25 is fixedly connected between the outer plate 19 and the inner wall of one side of the second mounting slot 22, the inner wall of the outer plate 19 is provided with a third mounting slot 26, the inner wall of the third mounting slot 26 is slidably connected with an inner plate 23, the same compression spring 24 is fixedly connected between the top of the inner plate 23 and the top inner wall of the third mounting slot 26, and the clamping assembly further comprises a protruding block 21 fixedly connected to the bottom of the inner plate 23. The bottom of the pressing plate 11 is provided with a second rectangular hole 20 matched with the inner plate 23, and the protruding block 21 is located in the inside of the second rectangular hole 20.

[0048] Put the side plate body 3 on the bottom plate 2, and make the position of the side plate body 3 that needs to be welded on one side of the weld 6, at this time the outer plate 19 is in contact with the side plate body 3, and the outer plate 19 is extruded into the second mounting slot 22, at this time the outer plate 19 is located directly above the second rectangular hole 20, the inner plate 23 is vertically downward under the elastic force of the compression spring 24 and extends to the outside of the second rectangular hole 20, the inner plate 23 drives the protruding block 21 to extend out of the second rectangular hole 20, the protruding block 21 is engaged with the gap between the corresponding fixed block 16, which ensures the stability of the pressing plate 11, which can be used for welding of side plates of different sizes.

[0049] The top of the bottom plate 2 is provided with a first mounting slot 12, and the inside of the first mounting slot 12 is provided with a brake assembly for braking the pressing plate 11, the brake assembly includes a plurality of fixed blocks 16 fixedly connected on one side of the first mounting slot 12, the gap between the plurality of fixed blocks 16 is used in cooperation with the protruding block 21, the bottom inner wall of the first mounting slot 12 is slidably connected with a sliding block 15, one side of the sliding block 15 is fixedly connected with a triangular block 17, the triangular block 17 is used in cooperation with the protruding block 21, and the one side of the sliding block 15 and the one side inner wall of the first mounting slot 12 are fixedly connected with two symmetrical tension springs 13, when it is necessary to release the device brake, the pushing plate 9 can be pushed, the pushing plate 9 drives the sliding block 15 to move horizontally, the sliding block 15 drives the triangular block 17 to move horizontally, the triangular block 17 drives the protruding block 21 to move vertically upward, the protruding block 21 drives the inner plate 23 to move vertically upward, the inner plate 23 extrudes the compression spring 24 and enters the inside of the second rectangular hole 20, at this time the pressing plate 11 can be moved horizontally away from the side plate body 3, the pressing plate 11 can no longer press the side plate body 3, and the new side plate body 3 is convenient for replacement and welding;

[0050] The first rectangular hole 14 is provided on one side of the second mounting slot 22, and the pushing plate 9 is slidably connected in the first rectangular hole 14, one end of the pushing plate 9 is fixedly connected with one side of the sliding block 15, and two arc surfaces 5 are arranged on one side of the weld 6, in the welding process, the rare gas is discharged through the air inlet pipe 8 and enters the inside of the U-shaped cavity 18, and is discharged from the plurality of air outlet holes 7, so as to ensure the welding effect, and the arrangement of the weld 6 can ensure that the walking path of the welding gun 27 is a straight line, and the arrangement of the arc surface 5 can facilitate the welding gun 27 to be put in, and the use is more convenient.

[0051] A power battery side plate welding method, specifically comprising the following steps:

[0052] S1, the side plate body 3 is placed on the bottom plate 2, and the position of the side plate body 3 that needs to be welded is located on one side of the welding seam 6, at this time, the outer plate 19 is in contact with the side plate body 3, and the outer plate 19 is extruded into the second mounting groove 22 by the second spring 25, at this time, the outer plate 19 is located directly above the second rectangular hole 20, the inner plate 23 is vertically downward under the elastic force of the compression spring 24 and extends to the outside of the second rectangular hole 20, the inner plate 23 drives the protruding block 21 to extend out of the second rectangular hole 20, the protruding block 21 is clamped in the gap between the corresponding fixed block 16, which ensures the stability of the pressing plate 11, at this time, it can be suitable for welding of side plates of different sizes;

[0053] S2, in the welding process, rare gas is discharged through the gas inlet pipe 8 and enters the U-shaped cavity 18, and is discharged from the plurality of gas outlet holes 7, which is used to ensure the welding effect, and the welding seam 6 can ensure that the walking path of the welding gun 27 is a straight line, and the arc surface 5 can facilitate the placement of the welding gun 27, and the use is more convenient;

[0054] S3, when the device needs to be released, the push plate 9 can be pushed, the push plate 9 drives the sliding block 15 to move transversely, the sliding block 15 drives the triangular block 17 to move transversely, the triangular block 17 drives the protruding block 21 to move vertically upward, the protruding block 21 drives the inner plate 23 to move vertically upward, the inner plate 23 extrudes the compression spring 24 and enters the inside of the second rectangular hole 20, at this time, the pressing plate 11 can be moved transversely away from the side plate body 3, the pressing plate 11 can no longer press the side plate body 3, and the new side plate body 3 can be replaced for welding.

[0055] However, as known to those skilled in the art, the working principle and wiring method of the welding gun 27 are common, which belong to conventional means or common general knowledge, and will not be repeated here, and those skilled in the art can make any selection or replacement according to their needs or convenience.

[0056] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application; in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power battery side plate welding device, characterized in that, Include: The welding gun (27), the welding plate (1) and the side plate body (3), one side of the welding plate (1) is fixedly connected with the bottom plate (2), the side plate body (3) is placed on the bottom plate (2) and is located at one side of the welding plate (1), the welding gun (27) is arranged at one side of the welding plate (1), the top of the bottom plate (2) is fixedly connected with two fixed plates (4) symmetrically arranged, the top of the bottom plate (2) is slidably connected with the pressing plate (11), a plurality of first springs (10) are fixedly connected between the pressing plate (11) and the fixed plate (4), the top of the welding plate (1) is provided with a weld (6), the inside of the welding plate (1) is provided with a gas supply assembly for providing protective gas; The inside of the pressing plate (11) is provided with a second installation groove (22), the inside of the second installation groove (22) is provided with a clamping assembly for clamping the side plate body (3); The top of the bottom plate (2) is provided with a first installation groove (12), the inside of the first installation groove (12) is provided with a brake assembly for braking the pressing plate (11); The clamping assembly comprises an outer plate (19) slidably connected to the inner wall of the second installation groove (22), a second spring (25) is fixedly connected between the outer plate (19) and the inner wall of one side of the second installation groove (22), a third installation groove (26) is formed in the inner wall of the outer plate (19), an inner plate (23) is slidably connected to the inner wall of the third installation groove (26), and a compression spring (24) is fixedly connected between the top of the inner plate (23) and the top inner wall of the third installation groove (26); The clamping assembly further comprises a protrusion (21) fixedly connected to the bottom of the inner plate (23), the bottom of the pressing plate (11) is provided with a second rectangular hole (20) used in cooperation with the inner plate (23), and the protrusion (21) is located in the second rectangular hole (20); The brake assembly comprises a plurality of fixed blocks (16) fixedly connected to one side of the first installation groove (12), the gap between the plurality of fixed blocks (16) is used in cooperation with the protrusion (21), a sliding block (15) is slidably connected to the bottom inner wall of the first installation groove (12), a triangular block (17) is fixedly connected to one side of the sliding block (15), the triangular block (17) is used in cooperation with the protrusion (21), and two tension springs (13) symmetrically arranged are fixedly connected between one side of the sliding block (15) and the inner wall of one side of the first installation groove (12).

2. The power battery side plate welding device according to claim 1, characterized in that, The gas supply assembly comprises a U-shaped cavity (18) formed in the inside of the welding plate (1), a plurality of gas outlets (7) are formed in the bottom inner wall of the inner wall of both sides of the weld (6), the gas outlets (7) are communicated with the U-shaped cavity (18), and the bottom of the welding plate (1) is fixedly connected with an air inlet pipe (8) in communication.

3. The power battery side plate welding device according to claim 2, characterized in that, One side of the second installation groove (22) is provided with a first rectangular hole (14), a pushing plate (9) is slidably connected in the first rectangular hole (14), and one end of the pushing plate (9) is fixedly connected with one side of the sliding block (15).

4. The power battery side plate welding device according to claim 3, characterized in that, Two arc surfaces (5) are arranged on one side of the weld (6).

5. A welding method using the power battery side plate welding apparatus according to claim 4, characterized by, Specifically, the method comprises the following steps: S1, the side plate body (3) is placed on the bottom plate (2), and the position to be welded of the side plate body (3) is located on one side of the weld (6), at this time, the outer plate (19) abuts against the side plate body (3), and the outer plate (19) extrudes the second spring (25) into the inside of the second mounting groove (22), at this time, the outer plate (19) is located directly above the second rectangular hole (20), the inner plate (23) moves vertically downward under the elastic force of the compression spring (24) and extends to the outside of the second rectangular hole (20), the inner plate (23) drives the protruding block (21) to extend to the outside of the second rectangular hole (20), the protruding block (21) is clamped in the gap between the corresponding fixed block (16), so that the stability of the compression plate (11) is ensured, at this time, the device can be suitable for welding side plates of different sizes; S2, in the welding process, the rare gas is discharged through the air inlet pipe (8) and enters the inside of the U-shaped cavity (18), and is discharged from the plurality of air outlet holes (7), so as to ensure the welding effect, and the arrangement of the weld (6) can ensure that the walking path of the welding gun (27) is a straight line, and the arrangement of the arc surface (5) can facilitate the placement of the welding gun (27), and the use is more convenient; S3, when it is needed to release the device brake, the push plate (9) can be pushed, the push plate (9) drives the sliding block (15) to move transversely, the sliding block (15) drives the triangular block (17) to move transversely, the triangular block (17) drives the protruding block (21) to move vertically upward, the protruding block (21) drives the inner plate (23) to move vertically upward, the inner plate (23) extrudes the compression spring (24) and enters the inside of the second rectangular hole (20), at this time, the compression plate (11) can be moved transversely away from the side plate body (3), and the compression plate (11) can no longer compress the side plate body (3), so that a new side plate body (3) can be replaced for welding.

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