Plate welding auxiliary mechanism and welding mechanism

Abstract

The present invention provides a plate welding auxiliary mechanism, which utilizes multifunctional floating to achieve long-distance and high-precision welding of two lapped plates, including: a base, a lifting mechanism, and a bracket. The lifting mechanism is fixed on the base, and is used to drive the bracket to move up and down to tighten or loosen the plate. An adjustment unit is provided at the lower end of the bracket, and the adjustment unit includes: a first floating unit and a second floating unit. The bottom of the first floating unit is higher than the bottom of the second floating unit. After the second floating unit abuts against the plate, it automatically floats until the first floating unit abuts against the plate to reach a predetermined pre-tightening force, so that the bracket can automatically float with the surface of the two plates being pressed, and the two plates are pressed. The present invention can achieve long-distance continuous seamless welding through the rolling of the first floating unit and the second floating unit, which not only reduces the clamping mechanism, but also can weld while pressing, thereby shortening the working time. The present invention also provides a welding mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of plate welding, and in particular to a plate welding auxiliary mechanism and a welding mechanism. Background Art

[0002] Traditionally, two plates are welded together by plugging welding holes, which is prone to air leakage or liquid penetration in places with high sealing and corrosion resistance. For long-distance welding of long plates, especially deformation of the two plates in different directions (wavy lines, protrusions, depressions), a gap will be generated between the two plates. A clamping mechanism is needed to clamp the plates to make the two welded plates flat and seamless. The position of the clamping mechanism needs to be adjusted to complete the welding of the long plate, which not only adds more equipment to complete the clamping, but also increases the operation time. In view of this, the applicant proposed the present invention. Summary of the invention

[0003] The invention discloses a plate welding auxiliary mechanism and a welding mechanism, which have a simple structure and are easy to operate, and are intended to improve the problem of long-distance continuous seamless welding and save operation time.

[0004] The present invention adopts the following scheme:

[0005] A plate welding auxiliary mechanism, which uses multifunctional floating to achieve long-distance high-precision welding of two lapped plates, comprises: a base, a lifting mechanism, and a bracket. The lifting mechanism is fixed on the base and is used to drive the bracket to move up and down so that the bracket can tighten or loosen the plate. An adjustment unit is provided at the lower end of the bracket, and the adjustment unit comprises:

[0006] The first floating unit is arranged on the left and right sides of the bracket.

[0007] The first floating unit is fixed to the bracket through a connecting plate, and after the first floating unit abuts against the plate to reach a predetermined pressing force, the lifting mechanism is elastically extended and contracted to float the bracket so that the two plates are pressed and float along the surfaces of the two plates;

[0008] A second floating unit, the second floating unit comprises a first floating mechanism disposed at the front end of the bracket and a second floating mechanism disposed at the rear end of the bracket, an elastic member is disposed between the bracket and the first floating mechanism and the second floating mechanism, the elastic member enables the first floating mechanism and the second floating mechanism to have a downward pressing force so that when the floating unit abuts against the plate, the elastic force causes the two plates to be pressed and floats along the surfaces of the two plates;

[0009] The bottom of the first floating unit is higher than the bottom of the second floating unit. After the second floating unit abuts the plate, it automatically floats until the first floating unit abuts the plate to reach a predetermined pre-tightening force, so that the bracket can automatically float along the surface of the two compressed plates to complete the compression of the two plates.

[0010] As a further improvement, the first floating mechanism and the second floating mechanism are provided with a guide tube, a tightening block and a locking piece, the elastic piece is sleeved on the guide tube, the guide tube is sleeved on the bracket, and the locking piece is fixedly connected to the top of the guide tube, so that the first floating mechanism and the second floating mechanism are movably connected to the bracket and the first floating mechanism and the second floating mechanism can slide upward along the guide tube, the tightening block is sleeved on the guide tube and placed under the bracket to abut the elastic piece.

[0011] As a further improvement, the tightening block is fixed to the bracket by an adjusting device, and the adjusting device adjusts the initial elastic force of the elastic member by adjusting the position of the tightening block.

[0012] As a further improvement, a proportional valve may be further included, which is fixed on the base and is used to adjust the initial value of the predetermined pressing force of the lifting mechanism so that the lifting mechanism can elastically expand and contract after reaching the predetermined pressing force.

[0013] As a further improvement, a first sliding wheel and a second sliding wheel are provided at the bottom of the second floating unit and the first floating unit.

[0014] As a further improvement, the first sliding wheel and the second sliding wheel are provided with a first bearing and a second bearing.

[0015] As a further improvement, the first floating unit comprises at least two second sliding wheels, and the second sliding wheels are disposed on both sides of the connecting plate.

[0016] As a further improvement, linear guide rails are arranged on both sides of the base, and guide grooves matching with the linear guide rails are arranged on the bracket, and the lifting mechanism drives the bracket to slide up and down along the linear guide rails.

[0017] As a further improvement, limit members are provided at the upper and lower ends of the linear guide rail.

[0018] The present invention also provides the following solution:

[0019] A welding mechanism, characterized in that it is installed on a bracket of the above-mentioned plate welding auxiliary mechanism, and the welding mechanism is adjustably fixed to the bracket through a connecting seat. The welding mechanism includes a welding head, and the welding head is arranged between a first floating mechanism and a second floating mechanism so that welding can be performed when the adjusting unit presses the plate.

[0020] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0021] The double floating of the first floating unit and the second floating unit can realize the compression of the two overlapped welded plates. Specifically, the lifting device drives the bracket to move downward, and the second floating unit contacts the plate. Due to the action of the elastic member, the floating unit always has a downward elastic force, which can make the upper plate press the lower plate in the front-to-back direction and float with the surface of the plate, until the first floating unit abuts the plate to make the upper plate press the lower plate in the left-right direction. When the predetermined pre-tightening force is reached, the lifting mechanism will elastically expand and contract, so that the bracket can float with the surface of the plate to complete the compression of the plate, and the welding head welds the welding part. Through the rolling of the first floating unit and the second floating unit, long-distance continuous seamless welding can be achieved, which not only reduces the clamping mechanism, but also can weld while clamping, which is conducive to shortening the working time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the decomposed structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the present invention from a first viewing angle;

[0025] Figure 3 is a schematic diagram of the structure of the present invention at the initial position and the second viewing angle;

[0026] Figure 4 It is a structural schematic diagram of the lifting mechanism of the present invention driving the bracket to flatten the plate;

[0027] Figure 5 It is a schematic diagram of the structure in which the second floating unit of the present invention automatically floats along with the surface of the plate;

[0028] Figure 6 It is a structural schematic diagram of the initial elastic force adjustment position of the present invention;

[0029] Figure 7 The present invention Figure 3 Schematic cross-sectional view of AA in the figure;

[0030] Figure 8 The present invention Figure 4 A schematic cross-sectional view of the middle BB;

[0031] Fig. 9 It is a schematic diagram of the structure in which the first floating unit of the present invention automatically floats along with the surface of the plate;

[0032] Icons: 1. Base; 2. Lifting mechanism; 3. Bracket; 4. Adjusting unit; 5. Welding mechanism; 6. Elastic member; 7. Adjusting device; 11. Linear guide rail; 12. Limiting member; 31. Guide groove; 32. Scale line; 41. First floating mechanism; 42. Second floating mechanism; 43. First floating unit; 51. Connecting seat; 53. Pointer; 54. Long hole; 411. First sliding wheel; 412. Guide tube; 413. Stopper; 414. Tightening block; 431. Connecting plate; 432. Second sliding wheel. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] Example

[0039] Combination Figures 1 to 9 In this embodiment, due to the different thicknesses, the thinner plates are prone to arcs, which can be wavy in front and back, or wavy in left and right, or both. This embodiment provides a plate welding auxiliary mechanism, which uses multifunctional floating to achieve long-distance and high-precision welding of two lapped plates, including: a base 1, a lifting mechanism 2, a bracket 3 and an adjustment unit 4. The lifting mechanism 2 drives the bracket 3 to move downward so that the adjustment unit 4 abuts the plate. According to the plate thickness of the two plates, the initial preload force of the lifting mechanism 2 is adjusted. The upper plate is pressed by the upper first floating unit 43 of the adjustment unit 4. According to the predetermined preload force, the upper plate can be made close to the lower plate, or the upper and lower plates can be flattened to prevent gaps between the plates from affecting the welding quality. Then welding is performed through the welding mechanism. After welding is completed, the lifting mechanism 2 drives the bracket 3 to move upward to loosen the welded plate and complete the lap welding of the two plates.

[0040] In this embodiment, the base 1 is in the shape of a cuboid, and the front end and the bottom end of the base 1 are open, so that the base 1 has a frame structure. The bracket 3 is vertically slidably connected to the base 1, and a lifting mechanism 2 for driving the bracket 3 to slide is provided on the top of the bracket 3. The lifting mechanism 2 is fixed on the base 1. In this embodiment, the lifting mechanism 2 is a lifting cylinder. The support 3 is provided with a plurality of linear guide rails 11, each of which is provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. The plurality of linear guide rails 11 are provided with a plurality of linear guide rails 11. A linear guide rail 11 is only provided with two guide grooves 31 to cooperate therewith, so that the sliding of the bracket 3 can be more stable.

[0041] An adjustment unit 4 is provided at the lower end of the bracket 3, including a first floating unit 43 and a second floating unit, which are used to abut against and compress the plates. The two overlapped welded plates are pressed tightly together by the compression force generated by the double floating of the first floating unit 43 and the second floating unit. The bottom of the first floating unit 43 is higher than the bottom of the second floating unit. After the second floating unit abuts against the plates, it automatically floats until the first floating unit 43 abuts against the plates to reach a predetermined pre-tightening force, so that the bracket 3 can automatically float along with the surfaces of the two compressed plates, completing the compression of the two plates.

[0042] Specifically, the second floating unit includes a first floating mechanism 41 disposed at the front end of the bracket 3 and a second floating mechanism 42 disposed at the rear end of the bracket 3. The first floating mechanism 41 and the second floating mechanism 42 are provided with a guide tube 412, a tightening block 414, a stopper 413 and a first sliding wheel 411. The guide tube 412 is sleeved on the bracket 3, and the stopper 413 is fixedly connected to the top of the guide tube 412, so that the first floating mechanism 41 and the second floating mechanism 42 are movably connected to the bracket 3 and the first floating mechanism 41 and the second floating mechanism 42 can slide upward along the guide tube 412. When the bracket 3 is connected with the first floating mechanism 41 and the second floating mechanism An elastic member 6 is provided between the first floating mechanism 41 and the second floating mechanism 42. The elastic member 6 enables the first floating mechanism 41 and the second floating mechanism 42 to have a downward pressing force so that the floating unit automatically floats when it abuts against the plate to press the plate through the elastic force, so that the two plates are close to each other in the front-to-back direction. When the first floating mechanism 41 and the second floating mechanism 42 float upward, the guide tube 412 and the stopper 413 will move upward relative to the bracket 3, and when the second floating unit does not abut against the plate, the elastic force causes the first floating mechanism 41 and the second floating mechanism 42 to move downward until the stopper 413 abuts against the bracket 3 to limit the first floating mechanism 41 and the second floating mechanism 42 from continuing to move downward. The tightening block 414 is sleeved on the guide tube 412 and placed under the bracket 3 to abut against the elastic member 6. The initial preload force of the elastic member 6 can be adjusted by changing the position of the tightening block 414.

[0043] Reference Figure 6 , the tightening block 414 is fixed to the bracket by the adjusting device 7, and the adjusting device 7 adjusts the initial elastic force of the elastic member 6 by adjusting the position of the tightening block 414. In this embodiment, the adjusting device is a bolt and a nut, and the nut is fixed to the bracket 3. The nut is used to prevent the bolt from loosening and prevent the change of the pre-tightening force. The bolt is connected with the threaded hole on the bracket 3. By adjusting the number of turns of the bolt entering the bracket 3, the tightening block 414 can be adjusted to be close to or away from the bracket 3, thereby changing the position of the tightening block 414 pressing the elastic member 6. It can be seen that when the tightening block 414 is at the highest point, the length of the elastic member 6 is the longest, the elasticity is small at this time, and the initial elastic force is also the smallest. When the tightening block 414 moves downward, the spring will be squeezed and increased, and its deformation will increase, and the energy it has will be more, and it will inevitably do more work on the outside world. Therefore, the initial elastic force will also increase accordingly, which will increase the first floating mechanism 41 The downward elastic force of the second floating mechanism 42 causes the upper plate to press the lower plate, so that the two plates are pressed into a straight plane. Of course, since the lower plate may be thicker, the initial elastic force is not large enough, and the second floating unit will float with the surfaces of the two plates.

[0044] The first floating unit 43 is arranged on the left and right sides of the bracket 3 and is fixed to the bracket 3 by a connecting plate 431. The first floating unit 43 abuts against the plate so that the upper plate presses the lower plate until a predetermined pre-tightening force is reached, which will cause the lifting mechanism 2 to elastically expand and contract, so that the bracket 3 automatically floats along the surfaces of the two plates.

[0045] Specifically, a proportional valve is also provided, which is fixed on the base 1. The initial value of the predetermined clamping force of the lifting mechanism 2 is adjusted according to the thickness of the two plates being clamped, so that the lifting mechanism 2 can elastically expand and contract after reaching the predetermined clamping force. In this embodiment, the thickness of the upper plate is not more than 5 mm, and the thickness of the lower plate is between 10 mm and 20 mm. The initial preload force is adjusted according to the welding of plates of different thicknesses, so that the upper plate can press the lower plate, or the upper plate presses the lower plate to flatten the two.

[0046] In order to realize long-distance compression welding, a first sliding wheel 411 and a second sliding wheel 432 are provided at the bottom of the first floating unit 43 and the second floating unit. The first sliding wheel 411 and the second sliding wheel 432 are provided with a first bearing and a second bearing. When the mechanism moves along the welded joint position, the first sliding wheel 411 and the second sliding wheel 432 rotate to reduce the resistance of the mechanism movement, so that the mechanism can perform long-distance welding without replacing the clamping member, and the mechanism always presses the two plates. In order to increase the compression effect, the first floating unit 43 includes at least two second sliding wheels 432. In this embodiment, the first floating unit 43 includes two second sliding wheels 432. The second sliding wheels 432 are arranged on both sides of the connecting plate 431 to make the mechanism more stable during movement.

[0047] The present invention also provides a welding mechanism 5, which is installed on the bracket 3 of the above-mentioned welding auxiliary mechanism. The welding mechanism 5 is adjustably fixed on the bracket 3 through a connecting seat 51. The welding mechanism 5 includes a welding head, which is arranged between the first floating mechanism 41 and the second floating mechanism 42 so that welding can be performed when the floating unit presses the plate. A scale phase line is arranged on the bracket 3, and a pointer 53 is arranged on the connecting seat 51 to point to the scale line 32 on the bracket 3. The focus of the welding head is adjusted by adjusting the position of the pointer 53 pointing to the scale line 32. Specifically, four long holes 54 are arranged on the connecting seat 51, which cooperate with the bolt holes arranged on the bracket 3 to fix the connecting seat 51 on the bracket 3. By moving the connecting seat 51, the bolt holes are placed at different positions of the long holes 54 to adjust the position of the connecting seat 51 and thus adjust the relative position of the welding mechanism 5, so that the focus of the welding head aligned with the welding part is different. The welding head is placed between the first floating mechanism 41 and the second floating mechanism 42, so that the front, back, left and right positions of the plate can have a pressing force during welding, and deformation caused by high-temperature welding can be prevented, which affects the quality of welding. Preferably, the welding head can be a laser head, which can perform overlap welding on plates of different materials and thicknesses to reduce material waste.

[0048] The principle of floating compression welding in this embodiment is as follows:

[0049] Stack two long-distance plates together, adjust the initial preload of the proportional valve according to the thickness of the two plates, and the lifting mechanism 2 drives the bracket 3 to move downward along the linear guide rail 11, so that the adjustment unit 4 at the lower end of the bracket 3 extends out of the bottom of the base 1. After the second floating unit abuts the plate, under the action of the elastic member 6, the upper plate is pressed against the lower plate in the front and rear directions and can float with the surface of the plate. The first floating unit 43 abuts the upper plate, so that the upper plate presses the lower plate left and right to achieve the initial preload, that is, the workpiece is pressed. When the front, back, left and right sides of the upper plate are pressed against the lower plate, the welding head starts welding. Since the sliding wheels that are pressed at the bottom have bearings and can slide, the effect of pressing and welding can be achieved, and long-distance welding can be performed. During the welding process, since the lower plate is thicker and may have a certain arc shape, if the bracket 3 cannot float, it will be stuck in the protruding part. Therefore, after reaching the initial preload, the proportional valve control will enable the lifting mechanism 2 to be elastically retracted and thus float with the surface of the plate. Of course, if the initial preload force is large enough, the convex part can be pressed into a flat surface to complete the close welding of the two stacked plates.

[0050] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A plate welding auxiliary mechanism, characterized in that: The invention utilizes multifunctional floating to realize long-distance high-precision welding of two lapped welding plates, comprising: a base (1), a lifting mechanism (2), and a bracket (3), wherein the lifting mechanism (2) is fixed on the base (1) and is used to drive the bracket (3) to move up and down so that the bracket can press or loosen the plate, and an adjustment unit (4) is arranged at the lower end of the bracket (3), and the adjustment unit (4) comprises: A first floating unit (43), the first floating unit (43) is arranged on the left and right sides of the bracket (3), the first floating unit (43) is fixed to the bracket (3) through a connecting plate (431), and after the first floating unit (43) abuts against the plate to reach a predetermined pressing force, the lifting mechanism (2) elastically expands and contracts to float the bracket (3) so that the two plates are pressed and float along the surfaces of the two plates; A second floating unit, the second floating unit comprising a first floating mechanism (41) arranged at the front end of the bracket (3) and a second floating mechanism (42) arranged at the rear end of the bracket (3), an elastic member (6) being arranged between the bracket (3) and the first floating mechanism (41) and the second floating mechanism (42), the elastic member (6) making the first floating mechanism (41) and the second floating mechanism (42) have a downward pressing force so that when the second floating unit abuts against the plate, the elastic force causes the two plates to be pressed and floats along the surfaces of the two plates; The bottom of the first floating unit (43) is higher than the bottom of the second floating unit. After the second floating unit abuts against the plate, it automatically floats until the first floating unit (43) abuts against the plate to reach a predetermined pre-tightening force, so that the bracket (3) can automatically float along the surfaces of the two compressed plates, thereby completing the compression of the two plates.

2. A plate welding auxiliary mechanism according to claim 1, characterized in that: The first floating mechanism (41) and the second floating mechanism (42) are provided with a guide tube (412), a tightening block (414) and a locking member (413); the elastic member (6) is sleeved on the guide tube (412); the guide tube (412) is sleeved on the bracket (3); the locking member (413) is fixedly connected to the top of the guide tube (412), so that the first floating mechanism (41) and the second floating mechanism (42) are movably connected to the bracket (3) and the first floating mechanism (41) and the second floating mechanism (42) can slide upward along the guide tube (412); the tightening block (414) is sleeved on the guide tube (412) and is placed under the bracket (3) to abut against the elastic member (6).

3. A plate welding auxiliary mechanism according to claim 2, characterized in that: The tightening block (414) is fixed on the bracket via an adjusting device (7), and the adjusting device (7) adjusts the initial elastic force of the elastic member (6) by adjusting the position of the tightening block (414).

4. A plate welding auxiliary mechanism according to claim 1, characterized in that: It also comprises a proportional valve, which is fixed on the base (1) and is used to adjust the initial value of the predetermined pressing force of the lifting mechanism (2) so that the lifting mechanism (2) can elastically expand and contract after reaching the predetermined pressing force.

5. The plate welding auxiliary mechanism according to claim 1, characterized in that: A first sliding wheel (411) and a second sliding wheel (432) are provided at the bottom of the second floating unit and the first floating unit (43).

6. A plate welding auxiliary mechanism according to claim 5, characterized in that: The first sliding wheel (411) and the second sliding wheel (432) are provided with a first bearing and a second bearing.

7. A plate welding auxiliary mechanism according to claim 6, characterized in that: The first floating unit (43) comprises at least two second sliding wheels (432), and the second sliding wheels (432) are disposed on both sides of the connecting plate (431).

8. The plate welding auxiliary mechanism according to claim 1, characterized in that: Linear guide rails (11) are arranged on both sides of the base (1), guide grooves (31) matching the linear guide rails (11) are arranged on the bracket (3), and the lifting mechanism (2) drives the bracket (3) to slide up and down along the linear guide rails (11).

9. A plate welding auxiliary mechanism according to claim 8, characterized in that: Limiting members (12) are provided at the upper and lower ends of the linear guide rail (11).

10. A welding mechanism, characterized in that: Installed on a bracket (3) of a plate welding auxiliary mechanism as described in any one of claims 1 to 9, the welding mechanism (5) is adjustably fixed to the bracket (3) through a connecting seat (51), and the welding mechanism (5) includes a welding head, which is arranged between a first floating mechanism (41) and a second floating mechanism (42) so that welding can be performed when the adjusting unit (4) presses the plate.

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