Automatic welding device and welding method thereof

Abstract

The invention belongs to the technical field of welding devices and discloses an automatic welding device which comprises a supporting table and a supporting frame with the upper end fixed, a welding module is arranged at the lower end of the supporting frame, the top of the supporting frame is connected with a fixing plate, the lower end of the fixing plate is connected with a first sliding table, and the lower end of the first sliding table is connected with a second sliding table. The second sliding table is perpendicular to the first sliding table, the lower end of the second sliding table is connected with the second sliding block, the lower end of the second sliding block is connected with the guide pipe, the upper end of the welding module is embedded into the guide pipe, and the supporting plate is fixed to the upper end of the supporting table. According to the automatic welding device and the welding method thereof, the double-station feeding structure is arranged, station switching can be rapidly conducted after welding is completed so as to achieve continuous operation, compared with a traditional feeding structure, the working efficiency of the welding device can be improved, the clamping structure and the station switching are cooperatively matched, clamping and loosening can be synchronously achieved during workpiece switching, and the working efficiency of the welding device is improved. Manual operation is not needed, and the use convenience and the machining efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding devices, and particularly to an automatic welding device and a welding method thereof. Background Technique

[0002] A welding device refers to the general term for various devices, tools, and auxiliary systems used to achieve the connection of workpieces during the welding process. Its core function is to form a bond at the atomic or molecular level of the materials to be welded (usually metals or thermoplastic materials) by means of heating, pressure, or a combination of both, so as to obtain a firm joint.

[0003] However, when the existing automatic welding devices and their welding methods are in use, there are still certain problems: Existing, such as a plate welding device for tank body production with a Chinese patent application number of CN219542082U, includes a welding device main body, a clamping mechanism, a welding torch, and a movable sleeve. A groove is provided at the bottom end inside the welding device main body, and a bidirectional lead screw is provided inside the groove. Both ends of the bidirectional lead screw are sleeved with movable sleeves, and support plates are fixed to the tops of the movable sleeves. Rotary disks are provided on one side of each support plate, and clamping mechanisms are provided at both ends on one side of each rotary disk. A welding torch is provided at the central position inside the welding device main body; However, after the existing plate welding device finishes welding, it is necessary to perform loading and unloading operations on the workpiece, and the welding equipment cannot continue to operate during the loading and unloading process, so continuous welding operations cannot be achieved, and the welding efficiency is low.

[0004] In view of the above problems, innovative designs are made on the basis of the original automatic welding devices and their welding methods. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic welding device and a welding method thereof, so as to solve the problem that the existing welding device cannot perform welding operations synchronously during the loading and unloading operations of workpieces, cannot perform continuous welding operations, and the overall welding efficiency is low as mentioned in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An automatic welding device includes a support table and a support frame fixed to the upper end. A welding module is provided at the lower end of the support frame: The top of the support frame is connected to a fixing plate, the lower end of the fixing plate is connected to a first sliding table, the lower end of the first sliding table is connected to a second sliding table, the second sliding table is vertically distributed with respect to the first sliding table, the lower end of the second sliding table is connected to a second slider, and the upper end of the welding module is embedded inside the guide tube; A support plate is fixed to the upper end of the support platform. A transmission rod passes through the upper end of the support plate. Both ends of the transmission rod are connected to limit tubes, and both ends of the limit tubes are connected to transmission plates. Welding boxes are arranged on both sides of the support platform. Connecting plates are fixed to the lower ends of both sides of the welding boxes. A limit plate is connected between the connecting plates and the transmission plates; A clamping plate is arranged inside the welding box. The lower end of the clamping plate penetrates to the outside of the welding box, and the lower end of the clamping plate penetrates through a bidirectional reciprocating lead screw.

[0007] Preferably, two groups of first sliding platforms are provided, and the first sliding platforms are symmetrically distributed on the front and rear sides of the second sliding platform. The lower ends of the two groups of first sliding platforms are both slidably connected to first sliders, and the lower ends of the first sliders are fixed to the second sliding platform.

[0008] By adopting the above technical solution, the second sliding platform can be driven to move horizontally by two groups of first sliding platforms to adjust the left and right positions of the welding module.

[0009] Preferably, the lower end of the second sliding platform is slidably connected to a second slider. The lower end of the second slider is fixed to a guide tube. An electric push rod is fixed to the inner wall of the upper end of the guide tube, and the lower end of the electric push rod is fixed to the welding module.

[0010] By adopting the above technical solution, through the cooperation of the second sliding platform and the second slider, the front and rear position adjustment of the welding module can be realized. Combined with the left and right position adjustment of the first sliding platform, it can meet complex welding requirements. When welding, the height of the welding module can be controlled by the electric push rod to be applicable to the welding of workpieces with different heights.

[0011] Preferably, guide bars are fixed to both sides of the welding module. Chute grooves are opened on both sides of the guide tube, and the guide bars extend into the chute grooves.

[0012] By adopting the above technical solution, through the sliding connection between the guide bars and the chute grooves, the lifting stability of the welding module can be improved, and the welding stability of the welding module can be improved.

[0013] Preferably, the transmission rod is rotatably connected to the support plate, and the support plates are symmetrically distributed on both sides of the transmission rod. Both ends of the limit tube are slidably connected to the transmission plate. A return spring is arranged inside the limit tube, and both ends of the return spring are fixed to the two groups of transmission plates respectively. The end of the transmission plate is rotatably connected to the limit plate, and the inner side of the limit plate is fixed to the connecting plate.

[0014] By adopting the above technical solution, the support of the transmission rod can be realized through the support plate. When the transmission rod rotates, it can drive the limit tubes fixed at both ends to rotate, and drive the transmission plates to rotate synchronously by using the limit tubes. Since the end of the transmission plate is connected to the limit plate, when the transmission plate rotates, it synchronously drives the limit plate, the connecting plate and the welding box to rotate synchronously, thereby realizing the adjustment of the positions of the two groups of welding boxes and realizing the switching of the welding double stations.

[0015] Preferably, a power motor is fixed to the front side of the front support plate, and the front shaft end of the power motor is connected to a driving gear. The front end of the transmission rod is connected to a driven gear, and the driving gear is meshed with the driven gear.

[0016] With the above technical solution, the driving gear can be driven to rotate by the power motor, and the driven gear and the transmission rod are driven to rotate by the driving gear. The power motor is a stepping motor, which can achieve precise control of the rotation angle and maintain the stability and reliability of the double-station switching.

[0017] Preferably, the clamping plate is designed in a "T" shape and is slidably connected to the inner wall of the welding box. The lower end of the clamping plate is connected to a bidirectional reciprocating lead screw. Both ends of the bidirectional reciprocating lead screw penetrate through the limiting plate and the connecting plate, and both ends of the bidirectional reciprocating lead screw are fixedly connected to the transmission plate.

[0018] With the above technical solution, through the cooperation of the clamping plate and the bidirectional reciprocating lead screw, the stable clamping of the workpiece to be welded can be realized. When the bidirectional reciprocating lead screw rotates, it can drive the two groups of clamping plates to move in opposite directions or in opposite directions. Moreover, the bidirectional reciprocating lead screw is connected to the transmission plate. When the relative angle between the transmission plate and the welding box changes, the clamping plate can be driven to move, and the workpiece can be clamped and released synchronously when the double welding stations are switched.

[0019] Preferably, a first guide plate is arranged on the front side of the right welding box, and the first guide plate is fixed to the front side limiting plate of the right welding box. A second guide plate is arranged on the rear side of the left welding box, and the second guide plate is fixed to the rear side limiting plate of the left welding box; Both the first guide plate and the second guide plate are designed in an "L" shape, and the first guide plate and the second guide plate are designed in opposite directions. Guide sliding tables are fixed to the upper ends of both sides of the support table, and sliding guide rods are arranged on the upper ends of the guide sliding tables. A guide slider is connected between the lower end of the sliding guide rod and the guide sliding table. The two groups of sliding guide rods are respectively slidably connected to the first guide plate and the second guide plate.

[0020] With the above technical solution, through the cooperation of the guide sliding table and the sliding guide rod, it can be ensured that the angles of the first guide plate and the second guide plate will not change when moving in the horizontal and vertical directions, so as to ensure that the two groups of welding boxes can maintain a horizontal state when switching stations. Moreover, the "L" shape design of the first guide plate and the second guide plate can avoid the situation of movement interference with the transmission plate.

[0021] Preferably, adjustable clamping plates are arranged on the opposite sides of the two groups of clamping plates. Both sides of the adjustable clamping plate penetrate through adjusting bolts. The adjusting bolts are rotatably connected to the adjustable clamping plate and are threadedly connected to the clamping plate.

[0022] With the above technical solution, by setting the adjusting bolt, the distance between the clamping plate and the adjustable clamping plate can be adjusted when the adjusting bolt is rotated, that is, the distance between the two groups of adjustable clamping plates. Since the rotation angle of the bidirectional reciprocating lead screw is constant, this structure can reliably clamp workpieces of different sizes.

[0023] A welding method of an automatic welding device includes the following steps: Step 1: Loading the workpiece to be welded. Place the workpiece to be welded inside the left welding box and stack it according to the welding requirements. Step 2: Workpiece loading. Drive the welding box to rotate and load the workpiece. Transfer the welding box with the workpiece placed to the lower end of the welding module, and clamping and positioning can be synchronously achieved during the transfer of the workpiece. Step 3: Welding the workpiece. After the workpiece is transferred to the lower part of the welding module, the position of the welding module can be adjusted by using the first sliding table and the second sliding table to achieve workpiece welding. Step 4: Unloading the workpiece and station switching. Due to the double-station setting, the two groups of welding boxes can achieve loading and unloading at one station while welding at the other station. After welding is completed, the station is switched, the workpiece after welding is loaded, and the workpiece not yet welded is loaded again to achieve continuous operation.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: For this automatic welding device and its welding method, by setting a double-station loading structure, the station can be quickly switched after welding is completed to achieve continuous operation. Compared with the traditional loading structure, the working efficiency of the welding equipment can be improved. Moreover, the clamping structure and the station switching cooperate with each other, and clamping and releasing can be synchronously achieved when the workpiece is switched, without manual operation, improving the convenience of use and the processing efficiency.

[0025] 1. By setting a station switching structure, the two groups of welding boxes can rotate reciprocally to continuously achieve station switching. While one group of welding boxes is placing and welding the workpiece, loading and unloading of the workpiece can be carried out inside the other group of welding boxes, so as to facilitate quick loading and unloading after welding is completed, reduce the waiting time for loading and unloading, and greatly improve the welding operation efficiency. 2. By cooperating with the clamping structure, when the position of the welding box is switched, the relative angle between the transmission plate and the welding box changes. Then, the two groups of clamping plates are driven by the reciprocating lead screw. When the two groups of welding boxes rotate reciprocally to achieve station switching, the clamping structure cooperates with it. When the welding box moves to the lower part of the welding module, reliable clamping of the workpiece is achieved, and when the welding box moves to the loading and unloading area, the clamping is released. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 Structural schematic diagram of the first sliding table and the second sliding table of the present invention; Figure 4 Structural schematic diagram of the electric push rod and the welding module of the present invention; Figure 5 Structural schematic diagram of the support plate and the transmission rod of the present invention; Figure 6 Structural schematic diagram of the transmission plate and the limit plate of the present invention; Figure 7 Structural schematic diagram of the power motor and the driving gear of the present invention; Figure 8 Structural schematic diagram of the limit tube and the return spring of the present invention; Figure 9 Structural schematic diagram of the bidirectional reciprocating lead screw and the clamping plate of the present invention; Figure 10 Structural schematic diagram of the second embodiment of the present invention.

[0027] In the figure: 1, support table; 2, support frame; 3, fixed plate; 4, first sliding table; 5, first slider; 6, second sliding table; 7, second slider; 8, guide tube; 9, electric push rod; 10, welding module; 11, guide bar; 12, support plate; 13, transmission rod; 14, limit tube; 15, transmission plate; 16, welding box; 17, limit plate; 18, connecting plate; 19, bidirectional reciprocating lead screw; 20, clamping plate; 21, first guide plate; 22, sliding guide rod; 23, guide sliding table; 24, second guide plate; 25, power motor; 26, driving gear; 27, driven gear; 28, return spring; 29, adjustable clamping plate; 30, adjusting bolt. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1, please refer to Figure 1-9, the present invention provides a technical solution: an automatic welding device, including a support table 1 and a support frame 2 fixed at the upper end. A welding module 10 is provided at the lower end of the support frame 2. The top of the support frame 2 is connected to a fixing plate 3. The lower end of the fixing plate 3 is connected to a first slide table 4. The lower end of the first slide table 4 is connected to a second slide table 6. The second slide table 6 is vertically distributed with respect to the first slide table 4. The lower end of the second slide table 6 is connected to a second slider 7. The lower end of the second slider 7 is connected to a guide tube 8. The upper end of the welding module 10 is embedded inside the guide tube 8; there are two groups of the first slide tables 4, and the two first slide tables 4 are symmetrically distributed on the front and back sides of the second slide table 6. The lower ends of the two first slide tables 4 are both slidably connected to a first slider 5, and the lower end of the first slider 5 is fixed to the second slide table 6; the lower end of the second slide table 6 is slidably connected to the second slider 7, the lower end of the second slider 7 is fixed to the guide tube 8, and an electric push rod 9 is fixed to the inner wall of the upper end of the guide tube 8, and the lower end of the electric push rod 9 is fixed to the welding module 10; guide bars 11 are fixed on both sides of the welding module 10, chutes are opened on both sides of the guide tube 8, and the guide bars 11 extend into the chutes. Both the first slide table 4 and the second slide table 6 are high-precision electric slide tables. With the PLC control structure, the position and movement trajectory of the welding module 10 can be accurately controlled to improve the welding quality. During welding, the first slide table 4 controls the horizontal movement of the first slider 5 and the second slide table 6. When the second slide table 6 moves, it can drive structures such as the second slider 7, the guide tube 8, and the welding module 10 to move synchronously to adjust the left and right positions of the welding module 10; at the same time, the second slide table 6 can drive the second slider 7 to move back and forth, and the front and back position adjustment of the welding module 10 can be realized. During the welding process, in order to adapt to the welding of plate workpieces with different thicknesses, a height adjustment structure is provided. The electric push rod 9 is used to control the lifting of the welding module 10 inside the guide tube 8. During the lifting process of the welding module 10, the guide bars 11 are driven to slide inside the chutes, maintaining high stability and avoiding deviation.

[0030] A support platform 1 has a fixed support plate 12 at its upper end. The upper end of the support plate 12 penetrates through a transmission rod 13. Both ends of the transmission rod 13 are connected to limit tubes 14, and both ends of the limit tubes 14 are connected to transmission plates 15. Welding boxes 16 are arranged on both sides of the support platform 1. At the lower ends of both sides of the welding box 16, connecting plates 18 are fixed. A limit plate 17 is connected between the connecting plate 18 and the transmission plate 15; the transmission rod 13 is rotatably connected to the support plate 12, and the support plates 12 are symmetrically distributed on both sides of the transmission rod 13. Both ends of the limit tube 14 are slidably connected to the transmission plate 15; the end of the transmission plate 15 is rotatably connected to the limit plate 17, and the inner side of the limit plate 17 is fixed to the connecting plate 18. A power motor 25 is fixed on the front side of the front support plate 12, and the front shaft end of the power motor 25 is connected to a driving gear 26. The front end of the transmission rod 13 is connected to a driven gear 27, and the driving gear 26 is meshed with the driven gear 27. Two groups of support plates 12 are used to support and install the transmission rod 13. A bearing is connected between the support plate 12 and the transmission rod 13 to keep the rotation smooth and stable. Both ends of the transmission rod 13 are connected to limit tubes 14. When the limit tubes 14 rotate, they drive the transmission plates 15 slidably connected at both ends to rotate synchronously. The transmission rod 13 drives the limit tubes 14 and the transmission plates 15 to rotate synchronously. The limit plate 17 connected to the end of the transmission plate 15 follows the movement and rotates around the transmission rod 13; the limit plate 17 is connected to the welding box 16 by the connecting plate 18 to drive the two groups of welding boxes 16 to rotate synchronously. The two groups of welding boxes 16 can rotate to change positions, so as to realize the switching of double stations. The driving gear 26 is driven to rotate by the power motor 25. The driving gear 26 drives the driven gear 27 and the transmission rod 13 to move reciprocally. The power motor 25 is a stepping motor, which can accurately control the rotation angle and has a self-locking function, and can realize accurate station switching and reliable positioning of the double station. When initially used, the plates to be welded are placed inside the lower welding box 16 on the left side. After the placement is completed, the transmission rod 13 rotates to drive the left welding box 16 to move upward and rightward, and move to the lower part of the welding module 10 for welding. And the welding box 16 at the upper right end initially rotates to the left side and waits for loading. After the welding is completed, the transmission rod 13 rotates in the reverse direction, and the station is switched again. The welded plates are unloaded and reloaded, reducing the waiting time for loading and unloading and improving the welding work efficiency.

[0031] Inside the welding box 16, a clamping plate 20 is provided. The lower end of the clamping plate 20 penetrates to the outside of the welding box 16, and the lower end of the clamping plate 20 penetrates through the bidirectional reciprocating lead screw 19. A return spring 28 is arranged inside the limiting tube 14, and both ends of the return spring 28 are fixed to two groups of transmission plates 15 respectively. The clamping plate 20 is designed in a "T" shape and is slidably connected to the inner wall of the welding box 16. The lower end of the clamping plate 20 is connected to the bidirectional reciprocating lead screw 19. Both ends of the bidirectional reciprocating lead screw 19 penetrate through the limiting plate 17 and the connecting plate 18, and both ends of the bidirectional reciprocating lead screw 19 are fixedly connected to the transmission plate 15. A first guide plate 21 is arranged on the front side of the right welding box 16, and the first guide plate 21 is fixed to the limiting plate 17 on the front side of the right welding box 16. A second guide plate 24 is arranged on the rear side of the left welding box 16, and the second guide plate 24 is fixed to the limiting plate 17 on the rear side of the left welding box 16. Both the first guide plate 21 and the second guide plate 24 are designed in an "L" shape, and the directions of the first guide plate 21 and the second guide plate 24 are opposite. On both upper ends of the two sides of the support table 1, guiding sliding platforms 23 are fixedly arranged, and sliding guiding rods 22 are arranged on the upper ends of the guiding sliding platforms 23. A guiding sliding block is connected between the lower end of the sliding guiding rod 22 and the guiding sliding platform 23. The two groups of sliding guiding rods 22 are respectively slidably connected to the first guide plate 21 and the second guide plate 24. To ensure that the welding box 16 can maintain a horizontal state during the station switching, welding, and loading and unloading operations, a limiting structure is provided to prevent the welding box 16 from shifting. The first guide plate 21 and the second guide plate 24 are respectively connected to the two groups of limiting plates 17. The limiting plate 17 is fixed to the welding box 16 through the connecting plate 18, so that the first guide plate 21 and the second guide plate 24 are in a fixed state with the two groups of welding boxes 16. By using the cooperation between the sliding guiding rod 22 and the guiding sliding platform 23, the deviation of the first guide plate 21 and the second guide plate 24 is restricted to maintain a horizontal state. The two groups of guide plates are respectively arranged on both sides of the welding box 16 to avoid movement interference during station switching. During station switching, the sliding guiding rod 22 can slide horizontally above the guiding sliding platform 23, and the first guide plate 21 and the second guide plate 24 can slide up and down outside the sliding guiding rod 22.

[0032] During welding processing, to prevent the sheet from shifting, a clamping structure is designed to position the sheet. When the relative angle between the two welding boxes 16 and the transmission plate 15 changes during the station switching of the two welding boxes 16, the transmission plate 15 drives the bidirectional reciprocating lead screw 19 to rotate. The bidirectional reciprocating lead screw 19 drives the two clamping plates 20 to move in opposite directions or the same direction, realizing the clamping and loosening of the sheet. When the two welding boxes 16 move downward to the welding module 10 for welding preparation, the clamping plates 20 perform clamping. When the welding is completed and the welding box 16 moves to the left loading and unloading area, the clamping plates 20 loosen the clamping of the sheet, making the operation more convenient without manual control.

[0033] Example two, please refer to Figure 10, The present invention provides a technical solution. The difference between this embodiment and the first embodiment lies in the reliable clamping range of the adjustable clamping structure. On the opposite sides of the two groups of clamping plates 20, adjustable clamping plates 29 are provided. The two sides of the adjustable clamping plate 29 penetrate through adjusting bolts 30. The adjusting bolts 30 are rotatably connected to the adjustable clamping plate 29 and are threadedly connected to the clamping plate 20. For welding and clamping workpieces of different sizes, adjustable clamping plates 29 are provided on the opposite sides of the two groups of clamping plates 20. Since the bidirectional reciprocating lead screw 19 can drive the clamping plates 20 to have a constant range of movement when the welding box 16 switches work positions, when welding workpieces smaller than the standard size are needed, clamping can be achieved through the adjustable clamping plates 29. By rotating the adjusting bolts 30, the distance between the adjustable clamping plate 29 and the clamping plate 20 can be adjusted. When the bidirectional reciprocating lead screw 19 rotates by the same angle, the distance between the two groups of adjustable clamping plates 29 is smaller, and workpieces of smaller sizes can be clamped.

[0034] A welding method of an automatic welding device includes the following steps: Step 1: Loading of the workpiece to be welded. Place the workpiece to be welded inside the left welding box 16 and stack it according to the welding requirements. Step 2: Workpiece loading. Drive the welding box 16 to rotate and load the workpiece, and transfer the welding box 16 with the workpiece placed therein to the lower end of the welding module 10. Clamping and positioning can be synchronously achieved during the transfer of the workpiece. Step 3: Welding of the workpiece. After the workpiece is transferred to the lower part of the welding module 10, the position of the welding module 10 can be adjusted by using the first sliding table 4 and the second sliding table 6 to achieve welding of the workpiece. Step 4: Unloading of the workpiece and work position switching. Since there are two work positions, the two groups of welding boxes 16 can achieve welding processing at one work position and synchronous loading and unloading at the other work position. After welding is completed, the work position is switched, the workpiece after welding is loaded, and the workpiece that has not been welded is loaded again to achieve continuous operation.

[0035] The content not detailedly described in this specification belongs to the prior art well-known to those skilled in the art. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic welding device, comprising a support table (1) and a support frame (2) fixed at the upper end. A welding module (10) is arranged at the lower end of the support frame (2), and it is characterized in that: A fixing plate (3) is connected to the top of the support frame (2). A first sliding table (4) is connected to the lower end of the fixing plate (3). A second sliding table (6) is connected to the lower end of the first sliding table (4). The second sliding table (6) is vertically distributed with respect to the first sliding table (4). A second sliding block (7) is connected to the lower end of the second sliding table (6). A guiding tube (8) is connected to the lower end of the second sliding block (7). The upper end of the welding module (10) is embedded inside the guiding tube (8); A support plate (12) is fixed to the upper end of the support table (1). A transmission rod (13) penetrates through the upper end of the support plate (12). Limiting tubes (14) are connected to both ends of the transmission rod (13), and transmission plates (15) are connected to both ends of the limiting tubes (14). Welding boxes (16) are arranged on both sides of the support table (1). Connecting plates (18) are fixed to the lower ends on both sides of the welding boxes (16). A limiting plate (17) is connected between the connecting plate (18) and the transmission plate (15); A clamping plate (20) is arranged inside the welding box (16). The lower end of the clamping plate (20) penetrates to the outside of the welding box (16), and the lower end of the clamping plate (20) penetrates through a bidirectional reciprocating lead screw (19).

2. The automatic welding device according to claim 1, characterized in that: Two groups of the first sliding tables (4) are provided, and the two groups of the first sliding tables (4) are symmetrically distributed on the front and rear sides of the second sliding table (6). The lower ends of the two groups of the first sliding tables (4) are both slidably connected to first sliding blocks (5), and the lower ends of the first sliding blocks (5) are fixed to the second sliding table (6).

3. An automatic welding device according to claim 2, characterized in that: The lower end of the second sliding table (6) is slidably connected to the second sliding block (7). The lower end of the second sliding block (7) is fixed to the guiding tube (8). An electric push rod (9) is fixed to the inner wall of the upper end of the guiding tube (8), and the lower end of the electric push rod (9) is fixed to the welding module (10).

4. The automatic welding device according to claim 3, characterized in that: Guiding strips (11) are fixed to both sides of the welding module (10). Chute grooves are formed on both sides of the guiding tube (8), and the guiding strips (11) extend into the chute grooves.

5. An automatic welding device according to claim 1, characterized in that: The transmission rod (13) is rotatably connected to the support plate (12), and the support plates (12) are symmetrically distributed on both sides of the transmission rod (13). The two ends of the limiting tube (14) are slidably connected to the transmission plates (15). A return spring (28) is arranged inside the limiting tube (14), and both ends of the return spring (28) are respectively fixed to the two groups of transmission plates (15). The end of the transmission plate (15) is rotatably connected to the limiting plate (17), and the inner side of the limiting plate (17) is fixed to the connecting plate (18).

6. An automatic welding device according to claim 5, characterized in that: A power motor (25) is fixed to the front side of the front support plate (12), and a driving gear (26) is connected to the front shaft end of the power motor (25). The front end of the transmission rod (13) is connected to a driven gear (27), and the driving gear (26) is meshed with the driven gear (27).

7. An automatic welding device according to claim 1, characterized in that: The clamping plate (20) is designed in a "T" shape and is slidably connected to the inner wall of the welding box (16). The lower end of the clamping plate (20) is connected to the bidirectional reciprocating screw rod (19). Both ends of the bidirectional reciprocating screw rod (19) penetrate through the limiting plate (17) and the connecting plate (18), and both ends of the bidirectional reciprocating screw rod (19) are fixedly connected to the transmission plate (15).

8. An automatic welding device according to claim 7, characterized in that: A first guiding plate (21) is arranged on the front side of the right welding box (16), and the first guiding plate (21) is fixed to the limiting plate (17) on the front side of the right welding box (16). A second guiding plate (24) is arranged on the rear side of the left welding box (16), and the second guiding plate (24) is fixed to the limiting plate (17) on the rear side of the left welding box (16); Both the first guiding plate (21) and the second guiding plate (24) are designed in an "L" shape, and the first guiding plate (21) and the second guiding plate (24) are designed in opposite directions. The upper ends of both sides of the support table (1) are fixedly provided with guiding sliding platforms (23), and sliding guiding rods (22) are arranged at the upper ends of the guiding sliding platforms (23). A guiding sliding block is connected between the lower end of the sliding guiding rod (22) and the guiding sliding platform (23). The two groups of sliding guiding rods (22) are respectively slidably connected to the first guiding plate (21) and the second guiding plate (24).

9. An automatic welding device according to claim 1, characterized in that: Adjustable clamping plates (29) are arranged on the opposite sides of the two groups of clamping plates (20). Both sides of the adjustable clamping plate (29) penetrate through adjusting bolts (30). The adjusting bolts (30) are rotatably connected to the adjustable clamping plate (29), and the adjusting bolts (30) are threadedly connected to the clamping plate (20).

10. The welding method of an automatic welding device according to any one of claims 1-9, characterized in that: It includes the following steps: Step 1: Loading of the workpiece to be welded. Place the workpiece to be welded inside the left welding box (16) and stack it according to the welding requirements; Step 2: Workpiece loading. Drive the welding box (16) to rotate and load the workpiece. Transfer the welding box (16) with the workpiece placed therein to the lower end of the welding module (10), and clamping and positioning can be synchronously achieved during the transfer of the workpiece; Step 3: Welding of the workpiece. After the workpiece is transferred below the welding module (10), the position of the welding module (10) can be adjusted by using the first sliding table (4) and the second sliding table (6) to achieve workpiece welding; Step 4: Unloading of the workpiece and station switching. Due to the setting of a double station, the two groups of welding boxes (16) can achieve welding processing at one station and synchronous loading and unloading at the other station. After welding is completed, station switching is performed, the workpiece after welding is loaded, and the workpiece that has not been welded is loaded again to achieve continuous operation.

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