Sheet nut welding system and welding method

Abstract

The invention discloses a thin plate nut welding system and method.The nut welding system comprises a positioning device, a nut welding device is arranged on one side of the positioning device, the nut welding device comprises welding tongs connected with a mechanical arm, a nut conveying mechanism is arranged on the welding tongs, and the welding tongs comprise an upper welding electrode and a lower welding electrode; and the welding upper electrode adsorbs a nut conveyed by the nut conveying mechanism through negative pressure and is matched with the welding lower electrode to be welded on the thin plate piece. By arranging the positioning device, a thin plate can be directly placed on the positioning device to be supported and positioned, and meanwhile, the nut conveying mechanism is integrally arranged on the electrode holder, so that nuts are automatically conveyed to the position below the welding upper electrode; and negative pressure is arranged on the welding upper electrode to carry out negative pressure adsorption on the nut conveyed to the lower portion, and then the nut is matched with the lower electrode to complete welding at a designated position, so that automatic welding of the nut is achieved, and the welding precision and the welding efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a thin plate nut welding system and a welding method. Background Art

[0002] The main purpose of projection welding nuts on automotive panels is to improve assembly efficiency and connection strength. Projection welding nuts are formed by pre-punching holes on metal plates, and then the projection welding nuts are fixed in the holes by pressing and welding to achieve the connection effect. This connection method can effectively reduce the need for thread repair and improve load resistance and connection accuracy.

[0003] In the prior art, the main method for welding nuts on automobile panels is to weld by manually assembling nuts. The specific method is as follows: the panel is grabbed to the welding position by a grabbing device, or the panel is manually installed on the welding station, and the welding hole opened on the panel is clamped and positioned with the positioning pin set on the welding lower electrode, and then the nut is pre-installed on the positioning pin, and the welding upper electrode moves downward to complete the welding of the nut. The existing welding method has the following disadvantages:

[0004] 1. Mainly for flat nuts or nuts with shorter lengths, after pre-positioning, the welding electrode moves downward during welding, which is not prone to position deviation, thereby ensuring welding accuracy. However, if the above method is used for welding of round nuts with longer lengths, if the nut is pre-installed or the welding electrode moves downward, it is easy for the welding gun to explode during welding.

[0005] 2. The above welding method requires manual or grabbing equipment to move the thin plate parts one by one to align the welding holes for welding, which has a low degree of automation and results in low welding efficiency;

[0006] 3. When welding nuts on thin and soft sheet metal parts, firstly, the grabbing equipment is prone to damage the product or deformation of the thin sheet metal parts when grabbing. Secondly, the thin sheet metal parts are more likely to cause the pre-positioned nuts to shift during the welding positioning process, resulting in poor welding accuracy.

[0007] In summary, the welding of nuts on thin plates in the prior art has the problems of low welding quality and low welding efficiency. At the same time, it requires the coordination of multiple equipment including workers, gripping equipment and welding equipment, and the process is relatively complicated with a low degree of automation. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a thin plate nut welding system and a welding method, which solve the problems of low welding quality and welding efficiency of nuts on thin plates in the prior art.

[0009] To achieve the above object, the present invention adopts the following technical solution:

[0010] A thin plate nut welding system includes a positioning device for installing and positioning the thin plate, a nut welding device is arranged on one side of the positioning device, the nut welding device includes a welding clamp connected to a robot arm, a nut conveying mechanism is arranged on the welding clamp, and the welding clamp includes an upper welding electrode and a lower welding electrode. The upper welding electrode absorbs the nut conveyed by the nut conveying mechanism through negative pressure and cooperates with the lower welding electrode to be welded to the thin plate.

[0011] With the above structural design, the thin plate can be directly placed on the positioning device for support and positioning by setting a positioning device, ensuring that the thin plate remains horizontal and stable. At the same time, a nut conveying mechanism is integrated on the welding clamp to realize automatic conveying of the nut to the bottom of the welding upper electrode, and a negative pressure is set on the welding upper electrode to negatively adsorb and fix the nut conveyed to the bottom, and then cooperate with the lower electrode to complete the welding at a specified position, thereby realizing automatic welding of the nut. There is no need to manually install the nut for pre-positioning, which improves the welding quality and welding efficiency, and at the same time avoids the problem of gun explosion caused by crooked placement of long nuts.

[0012] As a further improvement, the robotic arm adopts a six-axis robotic arm, and the welding clamp is movably mounted on the free end of the robotic arm. The welding clamp includes a main body, a mounting arm is provided at the lower end of the main body, the welding lower electrode is provided at the end of the mounting arm, a servo motor is provided at the upper end of the main body, and the lower end of the servo motor is connected to the welding upper electrode and drives it to move up and down.

[0013] With the above structural design, the welding clamp is driven to work by a six-axis robotic arm and controlled by a control system, thereby improving the flexibility and automation of its operation.

[0014] As a further improvement, the free end of the welding upper electrode is provided with an adsorption cavity opening downward, and the welding upper electrode is also provided with a vacuum adsorption joint, and the vacuum adsorption joint is externally connected to a vacuum device and communicated with the adsorption cavity to complete the adsorption and fixation of the nut.

[0015] With the above structural design, by setting up an adsorption chamber and an external vacuum device, the nut can be fixed in the adsorption chamber by vacuum adsorption, and then moved downward to weld the nut with the welding lower electrode. Therefore, during the downward movement of the welding upper electrode, there will be no welding quality problems or gun explosion due to the position deviation of the nut pre-positioned on the welding lower electrode, thereby improving the welding accuracy of the nut. The structural design also reduces the process of manually pre-positioning the nut, with a higher degree of automation and lower labor intensity.

[0016] As a further improvement, the nut conveying mechanism is provided on one side of the body, wherein:

[0017] The nut conveying mechanism includes a nut conveying tube, a driving assembly and a feeding rod. The nut conveying tube is fixed on the main body, and the driving assembly is fixed on one side of the nut conveying tube. The output end of the driving assembly is connected to the feeding rod and drives it to move up and down and rotate. A feeding sleeve is provided at the end of the feeding rod. The feeding rod is driven by the driving assembly to rotate between the nut conveying tube and the welding upper electrode to complete the feeding of the nuts.

[0018] The above structural design can realize automatic feeding of nuts, and there is no need for manual pre-positioning and installation of nuts, thereby improving the automation degree of welding.

[0019] As a further improvement, the driving assembly includes a lifting cylinder and a rotating cylinder, and the driving assembly is fixedly mounted on the main body through a mounting member.

[0020] As a further improvement, the feeding rod includes a first connecting rod, a second connecting rod and a third connecting rod. One end of the first connecting rod is connected to the driving assembly, and the other end is connected to the second connecting rod. The second connecting rod and the third connecting rod are connected by a sliding connection to adjust the length, and the free end of the third connecting rod is integrally formed with the feeding sleeve.

[0021] With the above structural design, the feeding rod adopts a multi-link design, and the length and position of the feeding rod can be adjusted according to needs to ensure the position accuracy of the nut feeding.

[0022] As a further improvement, the positioning device includes a base plate, on which are disposed a plurality of support assemblies, wherein the support assemblies include a middle support assembly and an end support assembly, and the end support assemblies are provided with clamping assemblies to clamp and fix the thin plate.

[0023] As a further improvement, the end support assembly includes a support plate arranged at the upper end, and a plurality of through holes are opened on the support plate, and the through holes are arranged corresponding to the welding positions of the thin plate part. The welding lower electrode can pass through the through hole to cooperate with the welding upper electrode to complete the nut welding on the thin plate part.

[0024] As a further improvement, the two ends of the support plate are respectively provided with the clamping assembly to fix the end of the thin plate, and the clamping assembly includes an elastic claw, and a protective layer is provided on the contact surface between the elastic claw and the thin plate.

[0025] By adopting the above structural design, multi-point support and fixation of the thin plate can be achieved, and the horizontal position can be always maintained, thereby making the nut welding more precise.

[0026] To achieve the above object, the present invention adopts the following technical solution:

[0027] A method for welding thin plate nuts, using the thin plate nut welding system according to any one of claims 1 to 8, characterized in that it comprises the following steps:

[0028] S1. Selecting an appropriate positioning device and a nut welding device, and adjusting welding parameters of the nut welding device, including the moving position of the welding clamp, through a control system;

[0029] S2. The thin plate is manually mounted on the positioning device. The middle support assembly and the end support assembly on the positioning device support the thin plate to keep it in a horizontal state. The welding position of the thin plate is aligned with the through hole set on the support plate, and the four sides of the thin plate are fixed by elastic claws.

[0030] S3, after the thin plate is installed on the positioning device, the control system of the nut welding device automatically controls the moving position of the welding clamp according to the set parameters, the lower welding electrode moves to the through hole and passes through the through hole and the welding hole of the upper thin plate, and the upper welding electrode is located directly above the welding hole and the lower welding electrode;

[0031] S4. The driving component of the nut conveying mechanism drives the feeding rod to rotate to the lower end of the nut conveying tube. The nut conveying tube puts the nut into the feeding sleeve. The rotating cylinder of the driving component continues to drive the feeding rod to rotate to the bottom of the welding upper electrode. Then, the lifting cylinder drives the feeding rod to move upward to the adsorption chamber of the welding upper electrode. The adsorption chamber adsorbs and fixes the nut in the feeding sleeve through negative pressure. Then, the driving component drives the feeding rod to move downward and rotate to the bottom of the nut conveying tube. At the same time, the servo motor drives the welding upper electrode to move downward and cooperate with the welding lower electrode to complete the welding of the nut. Then, the welding clamp moves to the next welding position to complete the nut welding in sequence.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention can directly place the thin plate on the positioning device for support and positioning by setting a positioning device, so as to ensure that the thin plate remains in a stable state. At the same time, a nut conveying mechanism is integrated on the welding clamp to realize automatic conveying of the nut to the bottom of the welding upper electrode, and a negative pressure is set on the welding upper electrode to adsorb and fix the nut conveyed to the bottom under negative pressure, and then cooperate with the lower electrode to complete welding at a specified position, thereby realizing automatic welding of the nut, without the need for manual installation of the nut for pre-positioning, and improving welding accuracy and welding efficiency;

[0034] 2. The present invention does not require an intermediate device to grasp the equipment, which reduces the equipment cost and reduces the damage to the thin plate;

[0035] 3. The present invention opens an adsorption chamber at the lower end of the welding upper electrode and connects an external negative pressure device, so that the nut can be fixed by vacuum adsorption, and then the welding upper electrode drives the nut downward to complete the welding, thereby avoiding the deviation of the nut during pre-installation, thereby improving the welding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 yes Figure 1 The enlarged view at A in FIG.

[0038] Figure 3 yes Figure 1 The enlarged view at B in the figure;

[0039] Figure 4 It is a structural schematic diagram of the present invention from another angle;

[0040] Figure 5 yes Figure 4 The enlarged view at C in the figure;

[0041] Figure 6 yes Figure 1 Schematic diagram of the structure after removing the thin plate;

[0042] Figure 7 yes Figure 6 The enlarged view at D in the figure.

[0043] In the figure:

[0044] Positioning device 1, base plate 11, middle support assembly 121, end support assembly 122, support plate 1221, through hole 1222, clamping assembly 13, elastic claw 131, protective layer 132, nut welding device 2, mechanical arm 21, welding clamp 22, welding upper electrode 221, vacuum adsorption joint 2211, welding lower electrode 222, main body 223, mounting arm 224, servo motor 225, nut conveying mechanism 23, nut conveying pipe 231, driving assembly 232, lifting cylinder 2321, rotating cylinder 2322, feeding rod 233, first connecting rod 2331, second connecting rod 2332, third connecting rod 2333, feeding sleeve 234, mounting part 235, mounting part one 2351, mounting part two 2352, adjusting hole 2353, bolt 2354, thin plate part 100, nut 200. DETAILED DESCRIPTION

[0045] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0046] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] See also Figures 1 to 7 A thin plate nut welding system includes a positioning device 1 to install and position a thin plate 100. When a thin and soft thin plate 100 is welded with a nut, the positioning device 1 is used to support and position the thin plate 100, thereby ensuring the horizontal position of the thin plate 100 during welding, thereby improving the welding accuracy of the nut. A nut welding device 2 is provided on one side of the positioning device 1. The nut welding device 2 includes a welding clamp 22 connected to a mechanical arm 21. The welding clamp 22 is provided with a nut conveying mechanism 23. The welding clamp 22 includes an upper welding electrode 221 and a lower welding electrode 222. The upper welding electrode 221 absorbs the nut 200 conveyed by the nut conveying mechanism 23 through negative pressure and cooperates with the lower welding electrode 222 to weld the nut 200 on the thin plate 100. The present invention fixes the thin plate 100 on the positioning device 1, and controls the nut welding device 2 to automatically adjust the welding position through the control system, and the nut welding device 2 is integrated with a nut conveying mechanism 23 to automatically feed the nuts. At the same time, the nuts are adsorbed on the welding upper electrode 221 through negative pressure, and the welding upper electrode 221 drives the nuts to move downward to complete automatic welding, thereby improving the welding quality and welding efficiency compared with the welding method of the prior art.

[0048] The specific structure is as follows:

[0049] Please continue reading Figure 2 The robotic arm 21 adopts a six-axis robotic arm, and the welding clamp 22 is movably mounted on the free end of the robotic arm 21. The welding clamp 22 includes a main body 223, a mounting arm 224 is provided at the lower end of the main body 223, and the end of the mounting arm 224 is provided with the welding lower electrode 222. A servo motor 225 is provided at the upper end of the main body 223, and the lower end of the servo motor 225 is connected to the welding upper electrode 221 and drives it to move up and down.

[0050] The free end of the welding upper electrode 221 is provided with an adsorption cavity (not shown) opening downward, and the welding upper electrode 221 is also provided with a vacuum adsorption joint 2211, and the vacuum adsorption joint 2211 is connected to an external vacuum device and communicated with the adsorption cavity to complete the adsorption and fixation of the nut 200.

[0051] See also Figure 2 and Figure 5 The nut conveying mechanism 23 is arranged on one side of the body 223, wherein the nut conveying mechanism 23 comprises a nut conveying pipe 231, a driving assembly 232 and a feeding rod 233. The nut conveying pipe 231 is fixed on the body 223, and the nut conveying pipe 231 realizes nut feeding through a pipeline. The driving assembly 232 is fixed on one side of the nut conveying pipe 231, and the output end of the driving assembly 232 is connected to the feeding rod 233 and drives it to move up and down and rotate. A feeding sleeve 234 is arranged at the end of the feeding rod 233, and the feeding rod 233 is driven by the driving assembly 232 to rotate between the nut conveying pipe 231 and the welding upper electrode 221 to complete the feeding of the nut 200. The driving assembly 232 comprises a lifting cylinder 2321 and a rotating cylinder 2322, and the driving assembly 232 is fixedly mounted on the body 223 through a mounting member 235.

[0052] The feeding rod 233 includes a first connecting rod 2331, a second connecting rod 2332 and a third connecting rod 2333. One end of the first connecting rod 2331 is connected to the driving assembly 232, and the other end is connected to the second connecting rod 2332. The second connecting rod 2332 and the third connecting rod 2333 are connected by a sliding connection to adjust the length. The free end of the third connecting rod 2333 is integrally formed with the feeding sleeve 234.

[0053] The mounting member 235 includes a first mounting portion 2351 and a second mounting portion 2352, wherein the first mounting portion 2351 is fixedly mounted on the body 223, and a long strip-shaped adjustment hole 2353 is provided on the second mounting portion 2352, and the second mounting portion 2352 is adjustably mounted on the first mounting portion 2351 through a bolt 2354, and the drive assembly 232 is mounted on the second mounting portion 2352. The present invention can realize the front-back and left-right position adjustment of the feeding sleeve 234 through the adjustable setting of the first mounting portion 2351 and the second mounting portion 2352, and the adjustable setting of the second connecting rod 2332 and the third connecting rod 2333, and can accurately adjust the positional relationship between the feeding sleeve 234 and the welding upper electrode 221, thereby ensuring the adsorption stability of the nut 200.

[0054] See also Figure 1 , Figure 6 and Figure 7The positioning device 1 includes a bottom plate 11, and a plurality of supporting components are arranged on the bottom plate 11. The supporting components include a middle supporting component 121 and an end supporting component 122. The end supporting component 122 is provided with a clamping component 13 to clamp and fix the thin plate 100. The end supporting component 122 includes a supporting plate 1221 arranged at the upper end, and a plurality of through holes 1222 are opened on the supporting plate 1221, and the through holes 1222 are arranged corresponding to the welding positions of the thin plate 100. The lower welding electrode 222 can pass through the through hole 1222 to cooperate with the upper welding electrode 221 to complete the welding of the nut 200 on the thin plate 100.

[0055] The two ends of the support plate 1221 are respectively provided with the clamping assembly 13 to fix the end of the thin plate member 100, and the clamping assembly 13 includes an elastic claw 131, and a protective layer 132 is provided on the contact surface between the elastic claw 131 and the thin plate member 100, which can protect the thin plate member 100.

[0056] The present invention also provides a thin plate nut welding method, which adopts the above-mentioned thin plate nut welding system and is characterized in that it includes the following steps:

[0057] S1, selecting an adapted positioning device 1 and a nut welding device 2, and adjusting welding parameters of the nut welding device 2, including the moving position of the welding clamp 22, through a control system;

[0058] S2. The thin plate 100 is manually mounted on the positioning device 1. The middle support assembly 121 and the end support assembly 122 on the positioning device 1 support the thin plate 100 to keep it in a horizontal state. The welding position of the thin plate 100 is aligned with the through hole 1222 provided on the support plate 1221, and the four sides of the thin plate 100 are fixed by the elastic claws 131.

[0059] S3, after the thin plate 100 is installed on the positioning device 1, the control system of the nut welding device 2 automatically controls the moving position of the welding clamp 22 according to the set parameters, and the welding lower electrode 222 moves to the through hole 1222 and passes through the through hole 1222 and the welding hole of the upper thin plate 100, and the welding upper electrode 221 is located directly above the welding hole and the welding lower electrode 222;

[0060] S4. The driving component 232 of the nut conveying mechanism 23 drives the feeding rod 233 to rotate to the lower end of the nut conveying tube 231. The nut conveying tube 231 puts the nut 200 into the feeding sleeve 234. The rotating cylinder 2322 of the driving component 232 continues to drive the feeding rod 233 to rotate to the bottom of the welding upper electrode 221. Then, the lifting cylinder 2321 drives the feeding rod 233 to move upward to the adsorption chamber of the welding upper electrode 221. The adsorption chamber adsorbs and fixes the nut 200 in the feeding sleeve 234 through negative pressure. Then, the driving component 232 drives the feeding rod 233 to move downward and rotate to the bottom of the nut conveying tube 231. At the same time, the servo motor 225 drives the welding upper electrode 221 to move downward and cooperate with the welding lower electrode 222 to complete the welding of the nut 200. Then, the welding clamp 22 moves to the next welding position to complete the nut welding in sequence.

[0061] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A thin plate nut welding system, characterized in that: The invention comprises a positioning device (1) for installing and positioning a thin plate member (100); a nut welding device (2) is arranged on one side of the positioning device (1); the nut welding device (2) comprises a welding clamp (22) connected to a mechanical arm (21); a nut conveying mechanism (23) is arranged on the welding clamp (22); and the welding clamp (22) comprises an upper welding electrode (221) and a lower welding electrode (222); the upper welding electrode (221) absorbs the nut (200) conveyed by the nut conveying mechanism (23) through negative pressure and cooperates with the lower welding electrode (222) to be welded to the thin plate member (100).

2. A thin plate nut welding system as claimed in claim 1, characterized in that: The mechanical arm (21) is a six-axis mechanical arm, and the welding clamp (22) is movably mounted on the free end of the mechanical arm (21). The welding clamp (22) comprises a main body (223), a mounting arm (224) is arranged at the lower end of the main body (223), the end of the mounting arm (224) is arranged with the welding lower electrode (222), the upper end of the main body (223) is arranged with a servo motor (225), and the lower end of the servo motor (225) is connected to the welding upper electrode (221) and drives it to move up and down.

3. A thin plate nut welding system as claimed in claim 2, characterized in that: The free end of the welding upper electrode (221) is provided with an adsorption cavity opening downward, and the welding upper electrode (221) is also provided with a vacuum adsorption joint (2211), and the vacuum adsorption joint (2211) is externally connected to a vacuum device and communicated with the adsorption cavity to complete adsorption and positioning of the nut (200).

4. A thin plate nut welding system as claimed in claim 2, characterized in that: The nut conveying mechanism (23) is provided on one side of the body (223), wherein: The nut conveying mechanism (23) comprises a nut conveying pipe (231), a driving assembly (232) and a feeding rod (233); the nut conveying pipe (231) is fixed on the body (223); the driving assembly (232) is fixed on one side of the nut conveying pipe (231); the output end of the driving assembly (232) is connected to the feeding rod (233) and drives the feeding rod (233) to move up and down and rotate; a feeding sleeve (234) is provided at the end of the feeding rod (233); the feeding rod (233) is driven by the driving assembly (232) to rotate between the nut conveying pipe (231) and the welding upper electrode (221) to complete the feeding of the nut (200).

5. A thin plate nut welding system as claimed in claim 4, characterized in that: The driving assembly (232) comprises a lifting cylinder (2321) and a rotating cylinder (2322), and the driving assembly (232) is fixedly mounted on the body (223) via a mounting member (235).

6. A thin plate nut welding system as claimed in claim 4, characterized in that: The feeding rod (233) includes a first connecting rod (2331), a second connecting rod (2332) and a third connecting rod (2333), one end of the first connecting rod (2331) is connected to the driving assembly (232), and the other end is connected to the second connecting rod (2332), the second connecting rod (2332) and the third connecting rod (2333) are connected by a sliding connection to adjust the length, and the free end of the third connecting rod (2333) is integrally formed with the feeding sleeve (234).

7. A thin plate nut welding system as claimed in claim 1, characterized in that: The positioning device (1) comprises a base plate (11), on which a plurality of support components are arranged, wherein the support components comprise a middle support component (121) and an end support component (122), and the end support component (122) is provided with a clamping component (13) for clamping and fixing the thin plate member (100).

8. A thin plate nut welding system as claimed in claim 7, characterized in that: The end support assembly (122) comprises a support plate (1221) arranged at the upper end, and a plurality of through holes (1222) are provided on the support plate (1221), and the through holes (1222) are arranged corresponding to the welding positions of the thin plate member (100), and the welding lower electrode (222) can pass through the through hole (1222) and cooperate with the welding upper electrode (221) to complete the welding of the nut (200) on the thin plate member (100).

9. A thin plate nut welding system as claimed in claim 8, characterized in that: The clamping components (13) are respectively arranged at both ends of the support plate (1221) to fix the ends of the thin plate member (100), and the clamping component component (13) comprises an elastic clamping claw (131), and a protective layer (132) is arranged on the contact surface between the elastic clamping claw (131) and the thin plate member (100).

10. A method for welding thin plate nuts, using the thin plate nut welding system according to any one of claims 1 to 8, characterized in that: The steps include: S1, selecting an adapted positioning device (1) and a nut welding device (2), and adjusting welding parameters of the nut welding device (2), including the moving position of the welding clamp (22), through control system; S2. The thin plate (100) is manually mounted on the positioning device (1), and the middle support assembly (121) and the end support assembly (122) on the positioning device (1) support the thin plate (100) at multiple points to keep it in a stable state. The welding position of the thin plate (100) is aligned with the through hole (1222) provided on the support plate (1221), and the four sides of the thin plate (100) are fixed by elastic claws (131); S3, after the thin plate (100) is mounted on the positioning device (1), the control system of the nut welding device (2) automatically controls the moving position of the welding clamp (22) according to the set parameters, the welding lower electrode (222) moves to the through hole (1222) and passes through the through hole (1222) and the welding hole of the upper thin plate (100), and the welding upper electrode (221) is located directly above the welding hole and the welding lower electrode (222); S4, the driving component (232) of the nut conveying mechanism (23) drives the feeding rod (233) to rotate to the lower end of the nut conveying tube (231), the nut conveying tube (231) puts the nut (200) into the feeding sleeve (234), the rotating cylinder (2322) of the driving component (232) continues to drive the feeding rod (233) to rotate to the bottom of the welding upper electrode (221), and then the lifting cylinder (2321) drives the feeding rod (233) to move upward to the welding upper electrode (221). 1), the adsorption chamber adsorbs and fixes the nut (200) in the feeding sleeve (234) through negative pressure, then the driving component (232) drives the feeding rod (233) to move downward and rotate to the bottom of the nut conveying tube (231), and at the same time, the servo motor (225) drives the welding upper electrode (221) to move downward and cooperate with the welding lower electrode (222) to complete the welding of the nut (200), then, the welding clamp (22) moves to the next welding position, and the welding of the nut (200) is completed in sequence.

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