Welding fixture capable of enabling bottom cover to enter shell automatically and application method of welding fixture

Abstract

The invention provides a bottom cover automatic shell entering welding clamp and an application method thereof. The bottom cover automatic shell entering welding clamp comprises a support and a lifting base. The first press-fitting assembly comprises a pressing block, a lifting driving mechanism for promoting the pressing block to lift up and down, a first reference structure, a second reference structure, a long edge side pressing mechanism and a short edge side pressing mechanism; the first reference structure and the second reference structure extend downwards to be provided with a first reference part and a second reference part arranged on the outer side of the first reference part; the second press-fitting assembly comprises a positioning base, a jacking mechanism, a long edge correcting mechanism and a short edge correcting mechanism. The jacking mechanism is provided with a central jacking part and outer jacking parts located on the two sides of the central jacking part, the shell is vertically through and arranged on the positioning base in a sleeving mode, and the central jacking part and / or the outer jacking parts of the jacking mechanism can ascend to the outside of the top of the positioning base so as to independently or synchronously jack the cover plate. The cover plate can be prevented from being collided and damaged, the press fitting and welding machining precision is high, the machining quality is good, and the working efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology, and in particular to an automatic bottom cover insertion welding fixture and its application method. Background Technology

[0002] Most existing steel shell welding fixtures involve manually pressing the bottom cover into the shell. This process, where the bottom cover is bent, aligned, and pressed into the steel shell before pre-welding, easily causes damage to the bottom cover during pressing. This also results in low efficiency in bottom cover insertion and low equipment production efficiency. Furthermore, current steel shell pre-welding fixtures have high requirements for the thickness tolerance of the incoming bottom cover material, and controlling this tolerance requires increased costs to ensure a high welding yield. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an automatic bottom cover insertion and welding fixture and its application method, which can avoid damage to the cover plate by bumping and knocking, and has high precision in pressing and welding, good processing quality and high work efficiency.

[0004] The embodiments of the present invention are achieved through the following technical solutions: An automatic bottom cover insertion and welding fixture, comprising: The bracket has a first pressing assembly at its top and a second pressing assembly at its bottom; the bottom of the bracket is connected to a lifting base for causing the second pressing assembly to move up and down. The first pressing assembly includes a pressing block, a lifting drive mechanism for causing the pressing block to move up and down, a first reference structure, a second reference structure, a long side pressing mechanism for pressing the cover plate along its long side, and a short side pressing mechanism for pressing the cover plate along its short side. The pressing block is located between the first reference structure and the second reference structure. Both the first reference structure and the second reference structure include a first reference portion extending downward and a second reference portion disposed outside the first reference portion. The bottom of the second reference portion protrudes beyond the horizontal plane where the bottom of the first reference portion is located. The second pressing assembly includes a positioning seat for mounting the housing, a lifting mechanism disposed within the positioning seat, a long side correction mechanism for correcting the long side of the cover plate, and a short side correction mechanism for correcting the short side of the cover plate; the lifting mechanism is provided with a central lifting part and outer lifting parts located on both sides of the central lifting part, the housing is vertically continuous and sleeved on the positioning seat, and the central lifting part and / or the outer lifting part of the lifting mechanism can rise to the top of the positioning seat to lift the cover plate individually or simultaneously.

[0005] According to a preferred embodiment, it further includes a compensating base for adjusting the relative position of the positioning seat and the pressure block; The compensation base is disposed at the bottom of the positioning seat.

[0006] According to a preferred embodiment, the compensation base includes a first substrate and a second substrate arranged vertically; the first substrate is connected to the second substrate through a plurality of elastic elements, and a positioning telescopic mechanism with its telescopic end facing downward is provided on the first substrate, the telescopic end of the positioning telescopic mechanism being able to abut against the top of the second substrate.

[0007] According to a preferred embodiment, the lifting end of the lifting base is connected to the bottom of the compensation base, and the lifting base causes the compensation base to move up and down.

[0008] According to a preferred embodiment, the central lifting section includes a second lifting unit; The outer lifting section includes a first lifting unit and a third lifting unit; The first lifting unit, the second lifting unit, and the third lifting unit are vertically arranged in the positioning seat from left to right.

[0009] According to a preferred embodiment, the first lifting unit, the second lifting unit, and the third lifting unit each include a lifting member and a lifting drive structure that causes the lifting member to move up and down.

[0010] According to a preferred embodiment, the long side pressing mechanism includes a long side pressing telescopic unit and a long side grid plate connected to the telescopic end of the long side pressing telescopic unit; The short-side pressing mechanism includes a short-side pressing telescopic unit and a short-side grid plate connected to the telescopic end of the short-side pressing telescopic unit; The long side correction mechanism includes a long side correction telescopic unit and a long side correction block connected to the telescopic end of the long side correction telescopic unit; The short side correction mechanism includes a short side correction telescopic unit and a short side correction block connected to the telescopic end of the short side correction telescopic unit.

[0011] According to a preferred embodiment, both the long side grid plate and the short side grid plate extend downwards; Both the long-side correction block and the short-side correction block extend upwards. The long side grid plate is provided with a first clearance position to avoid interference with the long side correction block; The short side grid plate has a second clearance position to avoid interference with the short side correction block.

[0012] According to a preferred embodiment, the top of the lifting base is horizontally provided with a slide rail, and the bottom of the compensation base is connected to the slide rail via a slider. It also includes a turntable, on which the lifting base is disposed.

[0013] According to a preferred embodiment, the positioning seat is provided with an inert gas channel, the bottom of the positioning seat is provided with an inert gas inlet and the top of the positioning seat is provided with an inert gas outlet, so as to facilitate the delivery of inert gas.

[0014] According to a preferred embodiment, both the long-side correction block and the short-side correction block are provided with rotatable correction wheels to ensure that the cover plate is centrally located at the top of the housing.

[0015] A method for applying an automatic bottom cover insertion welding fixture includes the following steps: Step S100: Fit the housing into the positioning seat so that the top of the housing is flush with the top of the positioning seat, and place the cover plate on top of the positioning seat; In step S200, the long side correction mechanism and the short side correction mechanism are used to correct the long side and short side of the cover plate respectively, so that the cover plate is centered in the housing; the telescopic end of the control positioning telescopic mechanism can abut against the top of the second base plate to lock the compensation base. In step S300, the lifting base moves upward, causing the top of the housing to fit against the bottom of the second reference part; the central lifting part rises, causing the cover plate to bend in the middle and extend downward to the inside of the housing at both ends; In step S400, the outer lifting part rises, causing the two ends of the cover plate to respectively adhere to the bottom of the corresponding first reference part; In step S500, the central lifting part descends, and the lifting drive mechanism drives the pressure block to press downward, so that the bottom of the first reference part is attached to both ends of the cover plate, and the top of the central lifting part rises and becomes level with the top of the outer lifting part. In step S600, the long side grid plate of the long side pressing mechanism extends to press the long side inner wall of the housing and the long side outer side of the cover plate into contact; the short side grid plate of the short side pressing mechanism extends to press the short side inner wall of the housing and the short side outer side of the cover plate into contact. Step S700: Helium gas is introduced through the positioning seat to complete the preparation before welding; In step S800, after welding is completed, the central lifting part descends, the outer lifting part descends synchronously, the long side grid plate of the long side pressure mechanism and the short side grid plate of the short side pressure mechanism retract, the lifting base descends, the locking state of the compensation base is released, and the welded product is unloaded.

[0016] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: This invention includes a first pressing assembly and a second pressing assembly. The positioning seat can effectively support the upward alignment of the shell and the cover plate. The positioning seat matches and aligns with the first reference structure and the second reference structure. The cover plate is corrected by the long side correction mechanism and the short side correction mechanism. The pressing of the cover plate and the shell is achieved by the pressure plate, the long side pressure mechanism, the short side pressure mechanism and the lifting mechanism. After precise pressing, high-precision welding is achieved, which can avoid damage to the cover plate. The pressing and welding process has high precision, good processing quality and high work efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of an automatic bottom cover insertion welding fixture provided in an embodiment of the present invention; Figure 2 A three-dimensional structural diagram of the first pressing assembly and the second pressing assembly provided in an embodiment of the present invention; Figure 3 for Figure 2 The main view; Figure 4 A partial three-dimensional structural diagram of the first pressing assembly and the second pressing assembly provided in an embodiment of the present invention; Figure 5 for Figure 4 A schematic diagram of the partially decomposed three-dimensional structure; Figure 6 This is a partial structural diagram of the first press-fit assembly provided in an embodiment of the present invention; Figure 7 for Figure 6 A schematic diagram of the three-dimensional structure; Figure 8 A three-dimensional structural diagram of the positioning seat provided in an embodiment of the present invention; Figure 9 This is another three-dimensional structural diagram of the positioning seat provided in an embodiment of the present invention; Figure 10 This is a three-dimensional structural diagram of the housing and cover plate provided in an embodiment of the present invention.

[0019] Icons: 1. Bracket; 2. Lifting base; 3. Pressure block; 4. Lifting drive mechanism; 5. First reference part; 6. Second reference part; 7. First base plate; 8. Second base plate; 9. Elastic element; 10. Positioning telescopic mechanism; 11. First lifting element; 12. Second lifting element; 13. Third lifting element; 14. Lifting component; 15. Lifting drive structure; 16. Long side grid plate; 17. Long side side pressure telescopic unit; 18. Short side grid plate; 19. Short side side pressure telescopic unit; 20. Long side correction block; 21. Long side correction telescopic unit; 22. Short side correction block; 23. Short side correction telescopic unit; 24. Inert gas inlet; 25. Turntable; 26. Correction wheel; 27. First clearance position; 28. Second clearance position; 29. ​​Slide rail; 30. Slider. Detailed Implementation

[0020] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Example

[0023] Please refer to Figures 1 to 10An automatic bottom cover insertion welding fixture includes: a bracket 1, a first pressing assembly disposed on the top of the bracket 1, and a second pressing assembly disposed on the bottom of the bracket 1; a lifting base 2 connected to the bottom of the bracket 1 for causing the second pressing assembly to move up and down; the first pressing assembly includes a pressing block 3, a lifting drive mechanism 4 for causing the pressing block 3 to move up and down, a first reference structure, a second reference structure, a long side pressing mechanism for pressing the long side of the cover plate, and a short side pressing mechanism for pressing the short side of the cover plate; the pressing block 3 is located between the first reference structure and the second reference structure, and both the first reference structure and the second reference structure include a downwardly extending first pressing assembly. The first reference part 5 and the second reference part 6 are disposed outside the first reference part 5. The bottom of the second reference part 6 protrudes from the horizontal plane where the bottom of the first reference part 5 is located. The second press-fitting assembly includes a positioning seat for mounting the housing, a lifting mechanism disposed in the positioning seat, a long side correction mechanism for correcting the long side of the cover plate, and a short side correction mechanism for correcting the short side of the cover plate. The lifting mechanism is provided with a central lifting part and outer lifting parts located on both sides of the central lifting part. The housing is vertically connected and sleeved on the positioning seat. The central lifting part and / or the outer lifting part of the lifting mechanism can rise to the top of the positioning seat to lift the cover plate individually or simultaneously.

[0024] Optionally, it also includes a compensating base for adjusting the relative position of the positioning seat and the pressure block 3; The compensation base is located at the bottom of the positioning seat.

[0025] Optionally, the compensation base includes a first substrate 7 and a second substrate 8 arranged vertically. The first substrate 7 is connected to the second substrate 8 via a plurality of elastic elements 9. A positioning telescopic mechanism 10 with its telescopic end facing downwards is provided on the first substrate 7. The telescopic end of the positioning telescopic mechanism 10 can abut against the top of the second substrate 8. The telescopic end of the positioning telescopic mechanism 10 can control the maximum distance between the first substrate 7 and the second substrate 8. When the telescopic end of the positioning telescopic mechanism 10 is in its longest state, there can be a maximum distance between the first substrate 7 and the second substrate 8 (i.e., the maximum distance limited by the compression of the elastic elements 9). When the telescopic end of the positioning telescopic mechanism 10 is at its shortest, the compression of the elastic elements 9 is the greatest, and the distance between the first substrate 7 and the second substrate 8 is the shortest.

[0026] Optionally, the lifting end of the lifting base 2 is connected to the bottom of the compensation base, and the lifting base 2 causes the compensation base to move up and down.

[0027] Optionally, the central lifting section includes a second lifting unit; The outer lifting section includes a first lifting unit and a third lifting unit; The first lifting unit, the second lifting unit, and the third lifting unit are vertically arranged in the positioning seat from left to right.

[0028] Optionally, the first lifting unit, the second lifting unit, and the third lifting unit all include a lifting member 14 and a lifting drive structure 15 that causes the lifting member 14 to move up and down.

[0029] Optionally, the long side pressing mechanism includes a long side pressing telescopic unit 17 and a long side grid plate 16 connected to the telescopic end of the long side pressing telescopic unit 17; The short-side pressure mechanism includes a short-side pressure telescopic unit 19 and a short-side grid plate 18 connected to the telescopic end of the short-side pressure telescopic unit 19; The long side correction mechanism includes a long side correction telescopic unit 21 and a long side correction block 20 connected to the telescopic end of the long side correction telescopic unit 21; The short side correction mechanism includes a short side correction telescopic unit 23 and a short side correction block 22 connected to the telescopic end of the short side correction telescopic unit 23.

[0030] Optionally, both the long side grid plate 16 and the short side grid plate 18 extend downwards; Both the long-side correction block 20 and the short-side correction block 22 extend upwards. The long side grid plate 16 has a first clearance position 27 to avoid interference with the long side correction block 20; The short side grid plate 18 has a second clearance position 28 to avoid interference with the short side correction block 22.

[0031] Optionally, the top of the lifting base 2 is horizontally provided with a slide rail 29, and the bottom of the compensation base is connected to the slide rail 29 via a slider 30; It also includes a turntable 25, and a lifting base 2 is mounted on the turntable 25.

[0032] Optionally, the positioning seat is provided with an inert gas channel, an inert gas inlet 24 is provided at the bottom of the positioning seat and an inert gas outlet is provided at the top of the positioning seat to facilitate the delivery of inert gas.

[0033] Optionally, both the long-side correction block 20 and the short-side correction block 22 are provided with rotatable correction wheels 26 to ensure that the cover plate is centered on the top of the housing.

[0034] A method for applying an automatic bottom cover insertion welding fixture includes the following steps: Step S100: Fit the housing into the positioning seat so that the top of the housing is flush with the top of the positioning seat, and place the cover plate on top of the positioning seat; In step S200, the long side correction mechanism and the short side correction mechanism are used to correct the long side and short side of the cover plate respectively, so that the cover plate is centered in the shell; the telescopic end of the control positioning telescopic mechanism 10 can abut against the top of the second base plate 8 to lock the compensation base. In step S300, the lifting base 2 moves upward, causing the top of the housing to fit against the bottom of the second reference part 6; the central lifting part rises, causing the cover plate to bend in the middle and extend downward to the inside of the housing at both ends; In step S400, the outer lifting part rises, causing the two ends of the cover plate to respectively adhere to the bottom of the corresponding first reference part 5; In step S500, the central lifting part descends, and the lifting drive mechanism 4 drives the pressure block 3 to press downward, so that the bottom of the first reference part 5 is attached to both ends of the cover plate, and the top of the central lifting part rises and becomes level with the top of the outer lifting part. In step S600, the long side grid plate 16 of the long side pressing mechanism extends to press the long side inner wall of the housing and the long side outer side of the cover plate into contact; the short side grid plate 18 of the short side pressing mechanism extends to press the short side inner wall of the housing and the short side outer side of the cover plate into contact. Step S700: Helium gas is introduced through the positioning seat to complete the preparation before welding; In step S800, after welding is completed, the central lifting part descends, the outer lifting part descends synchronously, the long side grid plate 16 of the long side pressing mechanism and the short side grid plate 18 of the short side pressing mechanism retract, the lifting base 2 descends, the locking state of the compensation base is released, and the welded product is unloaded.

[0035] Working principle of the invention: This invention includes a first pressing assembly and a second pressing assembly. The positioning seat can effectively support the upward alignment of the shell and the cover plate. The positioning seat matches and aligns with the first reference structure and the second reference structure. The cover plate is corrected by the long side correction mechanism and the short side correction mechanism. The pressing of the cover plate and the shell is achieved by the pressure plate, the long side pressure mechanism, the short side pressure mechanism and the lifting mechanism. After precise pressing, high-precision welding is achieved, which can avoid damage to the cover plate. The pressing and welding process has high precision, good processing quality and high work efficiency.

[0036] In this embodiment, as Figure 10 As shown, A is the housing, B is the cover plate, and C is the positioning seat. Specifically, the housing can be a steel shell, and the shape and size of the housing and the positioning seat are adapted to each other. The housing is fitted downwards onto the positioning seat, and the cover plate is centered on the top of the housing and located on top of the positioning seat. The arrow indicates the direction in which the housing is fitted downwards onto the positioning seat. Figure 9 As shown, the top surface or top side of the positioning seat has multiple perforated structures, which are inert gas outlets. They are not shown by reference numerals in the attached figure. The inert gas channel can be a pipe. Specifically, the inert gas can be helium. The press-fitting state can be detected by filling helium, and similarly, the sealing performance after welding can be detected by filling helium. like Figure 4 , Figure 5As shown, the first clearance position 27 is adapted to the top shape and size of the long side correction block 20, and the top of the long side correction block 20 is provided with a correction wheel 26. The second clearance position 28 is adapted to the top shape and size of the short side correction block 22, and the top of the short side correction block 22 is provided with a correction wheel 26. Long side correction mechanisms are provided on both the front and rear sides of the top of the positioning seat, and short side correction mechanisms are provided on both the left and right sides of the top of the positioning seat. The long side correction telescopic unit 21, the short side correction telescopic unit 23, the long side side pressure telescopic unit 17, the short side side pressure telescopic unit 19, the lifting drive structure 15, and the lifting drive mechanism 4 can all be selected from telescopic mechanisms such as cylinders and electric cylinders. The long side correction telescopic unit 21 causes the long side correction block 20 to move horizontally towards or away from the cover plate (shell / positioning seat). The short side correction telescopic unit 23 causes the short side correction block 20 to move horizontally towards or away from the cover plate (shell / positioning seat). The correction block 22 moves horizontally toward or away from the cover plate (shell / positioning seat); the correction wheel 26 on the top of the short side correction block 22 and the correction wheel 26 on the top of the long side correction block 20 can both be set at the top position of the positioning seat, so that the correction wheel 26 and the cover plate are at the same horizontal position, so as to adjust the cover plate to be centered in the shell (positioning seat); similarly, the long side pressure telescopic unit 17 causes the long side grid plate 16 to move horizontally toward or away from the cover plate (shell / positioning seat); the short side pressure telescopic unit 19 causes the short side grid plate 18 to move horizontally toward or away from the cover plate (shell / positioning seat); the long side pressure telescopic unit 17 and the short side pressure telescopic unit 19 are both set on the structure connected to the top of the bracket 1; the long side correction telescopic unit 21 and the short side correction telescopic unit 23 are set on the structure connected to the bottom of the bracket 1; like Figure 5 , Figure 6 , Figure 7 As shown, the pressure block 3 is located directly above the positioning seat, and the lifting drive mechanism 4 is installed on the structure connected to the top of the bracket 1. Initially, the pressure block 3 is at its highest position. When the pressure block 3 needs to be pressed downwards, the telescopic end of the lifting drive mechanism 4 drives the pressure block 3 to move downwards (towards the cover plate). The first reference structure and the second reference structure are installed on the structure connected to the top of the bracket 1, and when the pressure block 3 moves downwards, both the first reference structure and the second reference structure are stationary. Figure 6 As shown, the first reference structure is located on the left side of the pressure block 3, and the second reference structure is located on the right side of the pressure block 3. In this embodiment, the height difference between the first reference part 5 and the second reference part 6 of the first reference structure and the height difference between the first reference part 5 and the second reference part 6 of the second reference structure can be designed according to the distance between the cover plate protruding from the top of the housing. In this embodiment, the height difference is 0.2mm, and includes but is not limited to this data. Specifically, the second reference part 6 protrudes downward from the first reference part 5. The pressure plate can be adjusted up and down to be level with the first reference part 5 or the second reference part 6.

[0037] In this embodiment, the first lifting element 11, the second lifting element 12, and the third lifting element 13 can all move independently or synchronously without interfering with each other. The lifting drive structure 15 can cause the lifting member 14 to move up and down to cooperate with the pressing action. Figure 8 , Figure 9 As shown, in the initial state, the lifting members 14 of the first lifting element 11, the second lifting element 12, and the third lifting element 13 are all on the same horizontal plane.

[0038] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. An automatic bottom cover insertion and welding fixture, characterized in that, include: A bracket, wherein a first pressing assembly is provided at the top of the bracket and a second pressing assembly is provided at the bottom of the bracket; the bottom of the bracket is connected to a lifting base for causing the second pressing assembly to move up and down. The first pressing assembly includes a pressing block, a lifting drive mechanism for causing the pressing block to move up and down, a first reference structure, a second reference structure, a long side pressing mechanism for pressing the cover plate on its long side, and a short side pressing mechanism for pressing the cover plate on its short side. The pressure block is located between the first reference structure and the second reference structure. Both the first reference structure and the second reference structure include a first reference portion extending downward and a second reference portion disposed outside the first reference portion. The bottom of the second reference portion protrudes from the horizontal plane where the bottom of the first reference portion is located. The second pressing assembly includes a positioning seat for mounting the housing, a lifting mechanism disposed within the positioning seat, a long side correction mechanism for correcting the long side of the cover plate, and a short side correction mechanism for correcting the short side of the cover plate; the lifting mechanism is provided with a central lifting part and outer lifting parts located on both sides of the central lifting part, the housing is vertically connected and sleeved on the positioning seat, and the central lifting part and / or the outer lifting part of the lifting mechanism can rise to the top of the positioning seat to lift the cover plate individually or simultaneously.

2. The automatic bottom cover insertion welding fixture according to claim 1, characterized in that, It also includes a compensating base for adjusting the relative position of the positioning seat and the pressure block; The compensation base is disposed at the bottom of the positioning seat.

3. The automatic bottom cover insertion welding fixture according to claim 2, characterized in that, The compensation base includes a first substrate and a second substrate arranged vertically; the first substrate is connected to the second substrate through a plurality of elastic elements, and the first substrate is provided with a positioning telescopic mechanism with its telescopic end facing downward, the telescopic end of the positioning telescopic mechanism being able to abut against the top of the second substrate.

4. The automatic bottom cover insertion welding fixture according to claim 2, characterized in that, The lifting end of the lifting base is connected to the bottom of the compensation base, and the lifting base causes the compensation base to move up and down.

5. The automatic bottom cover insertion welding fixture according to claim 2, characterized in that, The central lifting section includes a second lifting unit; The outer lifting section includes a first lifting unit and a third lifting unit; The first lifting unit, the second lifting unit, and the third lifting unit are vertically arranged in the positioning seat from left to right.

6. The automatic bottom cover insertion welding fixture according to claim 5, characterized in that, The first lifting unit, the second lifting unit, and the third lifting unit all include a lifting component and a lifting drive structure that causes the lifting component to move up and down.

7. The automatic bottom cover insertion welding fixture according to claim 2, characterized in that, The long side pressing mechanism includes a long side pressing telescopic unit and a long side grid plate connected to the telescopic end of the long side pressing telescopic unit; The short-side pressing mechanism includes a short-side pressing telescopic unit and a short-side grid plate connected to the telescopic end of the short-side pressing telescopic unit; The long side correction mechanism includes a long side correction telescopic unit and a long side correction block connected to the telescopic end of the long side correction telescopic unit; The short side correction mechanism includes a short side correction telescopic unit and a short side correction block connected to the telescopic end of the short side correction telescopic unit.

8. The automatic bottom cover insertion welding fixture according to claim 7, characterized in that, Both the long side grid plate and the short side grid plate extend downwards; Both the long-side correction block and the short-side correction block extend upwards. The long side grid plate is provided with a first clearance position to avoid interference with the long side correction block; The short side grid plate has a second clearance position to avoid interference with the short side correction block.

9. The automatic bottom cover insertion welding fixture according to claim 4, characterized in that, The top of the lifting base is horizontally provided with a slide rail, and the bottom of the compensation base is connected to the slide rail via a slider. It also includes a turntable, on which the lifting base is disposed.

10. The automatic bottom cover insertion welding fixture according to claim 1, characterized in that, The positioning seat is provided with an inert gas channel, an inert gas inlet is provided at the bottom of the positioning seat and an inert gas outlet is provided at the top of the positioning seat to facilitate the delivery of inert gas.

11. The automatic bottom cover insertion welding fixture according to claim 7, characterized in that, Both the long-side correction block and the short-side correction block are equipped with rotatable correction wheels to ensure that the cover plate is centered on the top of the housing.

12. A method for applying an automatic bottom cover insertion welding fixture, comprising using the automatic bottom cover insertion welding fixture as described in any one of claims 1-11, characterized in that, Includes the following steps: Step S100: Fit the housing into the positioning seat so that the top of the housing is flush with the top of the positioning seat, and place the cover plate on top of the positioning seat; In step S200, the long side correction mechanism and the short side correction mechanism are used to correct the long side and short side of the cover plate respectively, so that the cover plate is centered in the housing; the telescopic end of the control positioning telescopic mechanism can abut against the top of the second base plate to lock the compensation base. In step S300, the lifting base moves upward, causing the top of the housing to fit against the bottom of the second reference part; the central lifting part rises, causing the cover plate to bend in the middle and extend downward to the inside of the housing at both ends; In step S400, the outer lifting part rises, causing the two ends of the cover plate to respectively adhere to the bottom of the corresponding first reference part; In step S500, the central lifting part descends, and the lifting drive mechanism drives the pressure block to press downward, so that the bottom of the first reference part is attached to both ends of the cover plate, and the top of the central lifting part rises and becomes level with the top of the outer lifting part. In step S600, the long side grid plate of the long side pressing mechanism extends to press the long side inner wall of the housing and the long side outer side of the cover plate into contact; the short side grid plate of the short side pressing mechanism extends to press the short side inner wall of the housing and the short side outer side of the cover plate into contact. Step S700: Helium gas is introduced through the positioning seat to complete the preparation before welding; In step S800, after welding is completed, the central lifting part descends, the outer lifting part descends synchronously, the long side grid plate of the long side pressure mechanism and the short side grid plate of the short side pressure mechanism retract, the lifting base descends, the locking state of the compensation base is released, and the welded product is unloaded.

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