Laser welding device for large heat preservation box

Abstract

The invention discloses a laser welding device for a large heat preservation box, and relates to the technical field of heat preservation box laser welding, the laser welding device comprises a base and a welding head, the welding head is arranged above the base, each side of the surface of the base is slidably provided with a push plate, a first spring is arranged between each push plate and the base, and the push plates are reset through the elastic force of the first springs; an adjusting frame is slidably mounted on the surface of the base, a sliding rail is slidably mounted on the inner side of the adjusting frame, the position of the sliding rail on the surface of the adjusting frame is adjustable, a sliding rod is slidably mounted on the surface of the sliding rail, the sliding rod is connected with a welding head, the welding head is driven to slide on the surface of the sliding rail by moving the sliding rod, a shell is evenly and neatly welded, and the flatness of a welded junction is guaranteed. And when the corner is welded, the angle of the welding head is easier to control, and the problems of excessive welding and welding omission are avoided.

Description

Technical Field

[0001] This invention belongs to the field of laser welding of insulated boxes, specifically relating to a laser welding device for large insulated boxes. Background Technology

[0002] The interior of the insulated box needs to be filled with insulation material. To ensure a smooth weld and good insulation effect during the welding process, laser welding is usually used.

[0003] Patent publication number CN116551168B relates to a laser welding device for processing automotive parts, comprising: a laser welding machine body and a support assembly, wherein a welding head is provided on the outer surface of the laser welding machine body; and a heat recovery assembly, wherein the heat recovery assembly includes a fixing ring, an insulation box is fixedly connected to the inner wall of the fixing ring, and an installation block is movably connected to the inner wall of the insulation box near the bottom. In use, this laser welding device for processing automotive parts, by activating a first electric push rod and a second electric push rod, brings the heat-absorbing end of the heat pipe close to the welding point. The heat pipe concentrates the heat and dissipates it from its heat-dissipating end to the heat sink, which then dissipates the heat into the insulation box, thus recovering waste heat for reuse. This solves the problem of energy waste and environmental pollution caused by the lack of waste heat recovery and reuse during laser welding.

[0004] In the aforementioned patent, by activating the first and second electric push rods, the heat-absorbing end of the heat pipe is brought close to the welding point. The heat pipe concentrates the heat and dissipates it from its heat-dissipating end to the heat sink. The heat sink then dissipates the heat into the insulation box, thus recovering the waste heat for reuse. This solves the problem of energy waste and environmental pollution caused by the failure to recover and reuse the heat generated at the welding point during laser welding. However, when welding large parts, it is easy to make the parts difficult to position due to their large size, making it difficult to ensure welding stability. The surface shape of automotive parts is irregular, and the laser beam will reflect irregularly when it hits the corner, making it difficult to concentrate the beam energy and dissipating the energy to the non-welding area, affecting the welding effect. It is also difficult to ensure the flatness of the weld at the corner. Summary of the Invention

[0005] The purpose of this invention is to provide a laser welding device for large insulated boxes, so as to solve the problems of difficulty in fixing and welding large insulated boxes due to their large size and the difficulty in welding the corners of the outer shell due to their special shape.

[0006] To achieve the above objectives, the present invention provides a laser welding device for a large insulated box, comprising: a base and a welding head, wherein the welding head is disposed above the base, a push plate is slidably mounted on each side of the surface of the base, a first spring is disposed between the push plate and the base, and the push plate is reset by the elastic force of the first spring, an adjustment frame is slidably mounted on the surface of the base, a slide rail is slidably mounted on the inner side of the adjustment frame, the position of the slide rail on the surface of the adjustment frame is adjustable, a slide rod is slidably mounted on the surface of the slide rail, the slide rod is connected to the welding head, and by moving the slide rod, the welding head is driven to slide on the surface of the slide rail, thereby performing uniform and neat welding on the outer shell, ensuring the flatness of the weld joint, facilitating the subsequent installation of an insulation layer on the inner wall of the outer shell, and effectively ensuring the insulation performance of the insulated box during subsequent use.

[0007] In one or more embodiments of the present invention, a fixed plate is slidably mounted on the surface of the push plate, and a buffer spring is provided between the fixed plate and the push plate. The push plate pushes the fixed plate to move towards the insulation box. After the fixed plate contacts the insulation box, it stops moving. The push plate compresses the buffer spring to transfer the pushing force to the surface of the fixed plate, forming a clamping force of the fixed plate on the shell, positioning and fixing the shell, ensuring that the shell will not shake during welding, and improving welding stability. A rotating ring is rotatably mounted on the bottom of the base. An arc plate is mounted on the surface of the rotating ring near the push plate. A fixing rod is fixedly mounted on the surface of the rotating ring. A hook is rotatably mounted on the surface of the base. The push plate is fixed by moving the fixing rod into the hook.

[0008] In one or more embodiments of the present invention, each side of the slide rail is slidably mounted on the inner wall of each side of the adjustment frame, allowing the slide rail to be moved in multiple directions on the surface of the adjustment frame to adjust its position. The base is provided with a first connecting pipe inside, one end of which is connected to a hook. The hook has an air hole on its surface, which is connected to the first connecting pipe inside the hook. The hook is also connected to the slide rail inside the adjustment frame. A stop door is rotatably mounted on the surface of the hook. After the stop door rotates, it blocks the air hole and limits its movement, closing the gas passage between the adjustment frame and the slide rail, thereby fixing the position of the slide rail.

[0009] In one or more embodiments of the present invention, a first torsion spring is provided between the hook and the base, and the elastic force of the first torsion spring causes the hook to reset. A second torsion spring is provided between the stop and the hook, and the elastic force of the second torsion spring causes the stop to reset.

[0010] In one or more embodiments of the present invention, a clamp is rotatably mounted on the surface of the slide rod. The clamp is tilted to keep the welding head tilted at a certain angle. When welding the outer shell, this prevents the laser from reflecting back to the welding head and causing damage. The welding head is installed inside the clamp. A toothed rod is rotatably mounted on the surface of the slide rod. A rack is provided at each corner of the slide rail. A stop bar is mounted on the surface of the rack. The stop bar pushes the clamp to rotate, causing the welding head to rotate. The toothed rod meshes with the surface of the clamp. Whenever the welding head welds at the corner of the outer shell, the laser path of the welding head will be deflected twice in opposite directions before and after the welding head passes the corner boundary line. This avoids irregular reflection at the corner, which would cause the laser energy to be dispersed and difficult to concentrate for welding.

[0011] In one or more embodiments of the present invention, a baffle is provided below each corner of the slide rail, and a baffle is provided at the corner to block welding slag from splashing and ensure the safety of the workers. A stop bar is installed on the surface of the slide rod. The stop bar presses against the top slope of the baffle and pushes the baffle to move downward without limiting the movement of the slide rod. A third torsion spring is provided between the clamp and the slide rod. The elastic force of the third torsion spring causes the clamp to reset.

[0012] In one or more embodiments of the present invention, a slider is slidably installed below each corner of the slide rail. A second spring is provided between the slider and the slide rail. The elastic force of the second spring causes the slider to return to its original position. A baffle is slidably installed on the surface of the slider. A third spring is provided between the baffle and the slider. The elastic force of the third spring causes the baffle to return to its original position. The baffle is connected to the slide rail via the slider and can slide bidirectionally on the surface of the slide rail. A telescopic rod is slidably installed on the side of the slide rail adjacent to the baffle. Several inclined strips are fixedly installed on the free end of the telescopic rod. The fixed end of the telescopic rod is sleeved with the surface of the baffle. When the rod moves to the inclined strip, it pushes the telescopic rod to move by squeezing the inclined surface of the inclined strip. After the telescopic rod moves, the fixed end drives the baffle to move, which regularly squeezes the corner after welding, making the weld at the corner flat and smooth.

[0013] In one or more embodiments of the present invention, an airbag is provided on the surface of the slide rail near the telescopic rod, and a pressure plate is fixedly installed on the fixed end surface of the telescopic rod. When the telescopic rod moves, it drives the pressure plate to move, squeezing the airbag. The airbag is connected to a second connecting pipe, and a nozzle is opened on the inner side of the baffle. The nozzle and the second connecting pipe are connected inside the baffle. After the airbag is squeezed, the gas inside enters the baffle through the second connecting pipe and then sprays out from the nozzle, pushing away the residual welding slag and dust on the corner surface, preventing welding slag from remaining at the corner, so that the baffle will not squeeze and shape impurities at the same time when shaping the corner, ensuring the flatness of the corner.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By using push plates and fixing plates to clamp the outer shell of the insulation box, the large size of the insulation box can be easily fixed during welding, making the operation simple and ensuring the stability of the outer shell during the welding process, thus improving the welding effect. The welding head slides along the slide rail to perform straight and regular welding on the outer shell of the insulation box. When welding at corners, the angle of the welding head is easier to control, avoiding problems such as over-welding or missed welding.

[0015] The moving welding head is rotated in opposite directions before and after passing the corner boundary line of the insulation box shell by a stop bar and a rack. This prevents irregular reflection of the welding head's optical path at the corner, which would cause the laser energy to be dispersed and difficult to concentrate for welding. In addition, the clamp is set at an angle to keep the welding head at a certain angle. During welding, this prevents the laser from reflecting back to the welding head and causing damage to the weld. A shield is set at the welding corner to block the slag from splashing and protect the workers.

[0016] The frequent pressure of the diagonal bar by the abutment rod causes the baffle to press against the newly welded corner, shaping the uneven weld that is prone to occur at difficult-to-weld corners, making the weld at the corner smooth and flat. Moreover, there is a certain distance between the diagonal bar and the baffle and the corner. The baffle can be triggered to press against the corner only after the corner has been welded and cooled slightly, to prevent the weld at the corner from sticking before it has cooled down. At the same time, the baffle will spray gas into the corner before pressing it to clean the residual welding slag and dust at the corner, so that the baffle will not press and shape impurities at the same time when shaping the corner, ensuring the flatness of the corner. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of one embodiment of the present invention; Figure 2 This is a structural diagram showing the positions of the fixing rod and the hook in one embodiment of the present invention; Figure 3 This is a structural diagram showing the positions of the rotating ring and the arc plate in one embodiment of the present invention; Figure 4 As shown in one embodiment of the present invention Figure 2 Enlarged view of section A in the middle; Figure 5 This is a structural diagram showing the positions of the slide bar and the clamp in one embodiment of the present invention; Figure 6 This is a structural diagram showing the positions of the rack and stop bar in one embodiment of the present invention; Figure 7 This is a structural diagram of the baffle position in one embodiment of the present invention; Figure 8 This is a structural diagram of the airbag location in one embodiment of the present invention.

[0018] Explanation of key figure labels: 1. Base; 2. Welding head; 3. Push plate; 4. Fixing plate; 5. Slide rod; 6. Slide rail; 7. Adjusting frame; 8. Fixing rod; 9. Hook; 10. Rotary ring; 11. Arc plate; 12. First connecting pipe; 13. Gear; 14. Stop; 15. Air hole; 16. Clamp; 17. Support rod; 18. Stop rod; 19. Cover; 20. Rack; 21. Slider; 22. Telescopic rod; 23. Diagonal bar; 24. Airbag; 25. Pressure plate; 26. Second connecting pipe; 27. Nozzle. Detailed Implementation

[0019] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0020] like Figure 1-8 As shown, one embodiment of the present invention is a laser welding device for a large insulated box, comprising: a base 1 and a welding head 2, the welding head 2 being disposed above the base 1, a push plate 3 being slidably mounted on each side of the surface of the base 1, a first spring being disposed between the push plate 3 and the base 1, the push plate 3 being reset by the elastic force of the first spring, an adjustment frame 7 being slidably mounted on the surface of the base 1, a slide rail 6 being slidably mounted on the inner side of the adjustment frame 7, the position of the slide rail 6 on the surface of the adjustment frame 7 being adjustable, a slide rod 5 being slidably mounted on the surface of the slide rail 6, the slide rod 5 being connected to the welding head 2, the welding head 2 being slidably mounted on the surface of the slide rail 6 by moving the slide rod 5, thereby performing uniform and neat welding on the outer shell, ensuring the flatness of the weld joint, facilitating the subsequent installation of an insulation layer on the inner wall of the outer shell, and effectively ensuring the insulation performance of the insulated box during subsequent use.

[0021] A fixed plate 4 is slidably mounted on the surface of the push plate 3. A buffer spring is provided between the fixed plate 4 and the push plate 3. The push plate 3 pushes the fixed plate 4 to move towards the insulation box. After the fixed plate 4 contacts the insulation box, it stops moving. The push plate 3 transfers the pushing force to the surface of the fixed plate 4 by squeezing the buffer spring, forming a clamping force of the fixed plate 4 on the shell, positioning and fixing the shell, ensuring that the shell will not shake during welding, and improving welding stability. A rotating ring 10 is rotatably mounted on the bottom of the base 1. An arc plate 11 is installed on the surface of the rotating ring 10 near the push plate 3. A fixing rod 8 is fixedly mounted on the surface of the rotating ring 10. A hook 9 is rotatably mounted on the surface of the base 1. By moving the fixing rod 8 into the hook 9 for fixing, the push plate 3 is fixed.

[0022] Each side of the slide rail 6 is slidably installed on the inner wall of each side of the adjusting frame 7. The slide rail 6 can be moved in multiple directions on the surface of the adjusting frame 7 to adjust its position. The base 1 is provided with a first connecting pipe 12. One end of the first connecting pipe 12 is connected to the hook 9. The hook 9 has an air hole 15 on its surface. The air hole 15 is connected to the first connecting pipe 12 inside the hook 9. The hook 9 is connected to the slide rail 6 inside the adjusting frame 7. A stop door 14 is rotatably installed on the surface of the hook 9. After the stop door 14 rotates, it blocks the air hole 15 and limits the air hole 15, closing the gas passage between the adjusting frame 7 and the slide rail 6, thereby fixing the position of the slide rail 6.

[0023] A first torsion spring is provided between the hook 9 and the base 1. The elastic force of the first torsion spring causes the hook 9 to reset. A second torsion spring is provided between the stop door 14 and the hook 9. The elastic force of the second torsion spring causes the stop door 14 to reset.

[0024] In this embodiment, when welding large insulation boxes, it is often difficult to fix the outer shell due to the large size of the insulation box. Moreover, the corners of the outer shell are difficult to weld due to their special shape. It is difficult to control the angle when welding the corners, which may cause over-welding or missing welding. This can easily affect the flatness of the inner wall of the outer shell, making it difficult to guarantee the insulation effect in subsequent use.

[0025] Place the outer shell to be welded between all the fixing plates 4, push the fixing rod 8 to move and drive the rotating ring 10 to rotate. The rotating ring 10 drives the arc plate 11 to rotate. When the arc surface of the arc plate 11 contacts the bottom of the push plate 3, it pushes the push plate 3 to move. After the push plate 3 moves, it drives the fixing plate 4 to move towards the surface of the outer shell until the fixing plate 4 contacts the surface of the outer shell and stops moving. The pushing force is transferred to the surface of the fixing plate 4 through the compression buffer spring of the push plate 3, forming the clamping force of the fixing plate 4 on the outer shell, positioning and fixing the outer shell, ensuring that the outer shell will not shake during welding, and improving welding stability. At the same time, the position of the slide rail 6 on the surface of the adjustment frame 7 can be adjusted by moving the slide rail 6. After the positions of the shell and slide rail 6 are determined, push the slide rod 5 into the hook 9 to limit the hook 9, thereby fixing the push plate 3 and maintaining the clamping of the shell by the fixing plate 4. At the same time, when the fixing rod 8 enters the hook 9, it will push the stop door 14 to rotate. After the stop door 14 rotates, it will block the air hole 15 and limit the air hole 15, closing the gas passage between the adjusting frame 7 and the slide rail 6, thereby fixing the position of the slide rail 6. By pushing the slide rod 5, the welding head 2 will slide on the surface of the slide rail 6 to perform uniform and neat welding on the shell, ensuring the flatness of the weld joint, which is convenient for the subsequent installation of the insulation layer on the inner wall of the shell, effectively ensuring the insulation performance of the insulation box during subsequent use.

[0026] Please see Figures 1-8Based on the above embodiments, in another embodiment of the present invention, a clamp 16 is rotatably mounted on the surface of the slide bar 5. The clamp 16 is tilted so that the welding head 2 is tilted at a certain angle. When welding the outer shell, this avoids laser reflection back to the welding head 2 and causing damage to the welding head 2. The welding head 2 is installed inside the clamp 16. A toothed bar 13 is rotatably mounted on the surface of the slide bar 5. A rack 20 is provided at each corner of the slide rail 6. A stop bar 18 is mounted on the surface of the rack 20. The stop bar 18 pushes the clamp 16 to rotate, which in turn drives the welding head 2 to rotate. The toothed bar 13 meshes with the surface of the clamp 16. Whenever the welding head 2 welds at the corner of the outer shell, the excitation light path of the welding head 2 will be offset twice in opposite directions before and after the welding head 2 passes the corner dividing line. This avoids irregular reflection at the corner, which would cause the laser energy to be dispersed and difficult to concentrate for welding.

[0027] Each corner of the slide rail 6 is equipped with a baffle 19 to prevent welding slag from splashing and ensure the safety of the workers. A stop bar 17 is installed on the surface of the slide rod 5. The stop bar 17 presses against the top slope of the baffle 19 and pushes the baffle 19 downward, without limiting the movement of the slide rod 5. A third torsion spring is provided between the clamp 16 and the slide rod 5. The elastic force of the third torsion spring causes the clamp 16 to reset.

[0028] In this embodiment, the corner of the outer shell is the junction of two adjacent welding surfaces, with one half belonging to the upper welding surface and the other half to the lower welding surface. During the movement of the welding head 2 by pushing the slide bar 5, whenever the welding head 2 moves to the corner of the slide rail 6, the surface of the clamp 16 contacts the stop bar 18. Under the obstruction of the stop bar 18, the clamp 16 rotates, causing the welding head 2 to rotate. Thus, during the welding process at the corner of the outer shell, the welding head 2 continuously rotates towards the upper welding surface from the moment it enters the bend until it enters the next welding surface. When the welding head 2 enters the next welding surface, the rack 20 pushes the rack 13 to rotate. After the rack 13 rotates, it pushes the clamp 16 to rotate, which in turn drives the welding head 2 to rotate towards the next welding surface. Whenever the welding head 2 welds at the corner of the shell, the excitation optical path of the welding head 2 will be offset twice in opposite directions before and after the welding head 2 passes the corner dividing line. This ensures that the excitation optical path of the welding head 2 can transfer energy to the surface of the shell, while avoiding irregular reflection at the corner, which would cause the laser energy to be dispersed and difficult to concentrate for welding. Moreover, the clamp 16 is set at an angle, so that the welding head 2 is kept at a certain angle. When welding the shell, this prevents the laser from being reflected back to the welding head 2 and causing damage to the welding head 2.

[0029] Please see Figures 1-8Based on the above embodiments, in another embodiment of the present invention, a slider 21 is slidably installed below each corner of the slide rail 6. A second spring is provided between the slider 21 and the slide rail 6. The elastic force of the second spring causes the slider 21 to return to its original position. A cover 19 is slidably installed on the surface of the slider 21. A third spring is provided between the cover 19 and the slider 21. The elastic force of the third spring causes the cover 19 to return to its original position. The cover 19 is connected to the slide rail 6 through the slider 21 and can slide bidirectionally on the surface of the slide rail 6. A telescopic rod 22 is slidably installed on the side of the slide rail 6 adjacent to the cover 19. Several inclined strips 23 are fixedly installed on the free end of the telescopic rod 22. The fixed end of the telescopic rod 22 is sleeved on the surface of the cover 19. When the abutment rod 17 moves to the inclined strip 23, it pushes the telescopic rod 22 to move by squeezing the inclined surface of the inclined strip 23. After the telescopic rod 22 moves, the fixed end drives the cover 19 to move, and the welded corner is regularly squeezed to make the weld at the corner flat and smooth.

[0030] An airbag 24 is provided on the surface of the slide rail 6 near the telescopic rod 22. A pressure plate 25 is fixedly installed on the fixed end surface of the telescopic rod 22. When the telescopic rod 22 moves, it drives the pressure plate 25 to move, squeezing the airbag 24. The airbag 24 is connected to a second connecting pipe 26. A nozzle 27 is opened on the inner side of the baffle 19. The nozzle 27 and the second connecting pipe 26 are connected inside the baffle 19. After the airbag 24 is squeezed, the gas inside enters the baffle 19 through the second connecting pipe 26 and is then sprayed out from the nozzle 27. This pushes away the residual welding slag and dust on the corner surface, preventing welding slag from remaining at the corner. This ensures that the baffle 19 will not squeeze and shape impurities at the same time when shaping the corner, thus ensuring the flatness of the corner.

[0031] In this embodiment, the laser energy dispersion at corners can easily lead to increased welding slag. A shield 19 is installed at the corner to prevent welding slag from splashing, ensuring worker safety. Simultaneously, the movement of the sliding rod 5 causes the abutment rod 17 to move. When the sliding rod 5 moves the welding head 2 to the corner to prepare for welding, the abutment rod 17 presses against the top slope of the shield 19, pushing the shield 19 downwards without limiting the movement of the sliding rod 5. When the welding head 2 completes welding at the corner, it continues to follow the sliding rod 5, simultaneously causing the abutment rod 17 to continue moving. When 17 moves to the inclined bar 23, it pushes the telescopic rod 22 to move by squeezing the inclined surface of the inclined bar 23. After the telescopic rod 22 moves, the fixed end drives the baffle 19 to move, and regularly squeezes the corner where the welding is completed. Through the squeezing of the baffle 19, the uneven weld that is easy to occur at the corner where it is difficult to weld is shaped, so that the weld at the corner is flat and smooth. Moreover, there is a certain distance between the inclined bar 23 and the baffle 19 and the corner. After the corner is welded and cooled slightly, the baffle 19 can be triggered to squeeze it, so as to prevent the weld at the corner from sticking before it has cooled down.

[0032] As the telescopic rod 22 moves, it also moves the pressure plate 25, which compresses the airbag 24. After being compressed, the gas inside the airbag 24 enters the baffle 19 through the second connecting pipe 26 and is then ejected from the nozzle 27. This pushes away the residual welding slag and dust on the corner surface, preventing welding slag from remaining at the corner. This ensures that the baffle 19 does not simultaneously compress and shape impurities when shaping the corner, thus guaranteeing the flatness of the corner.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A laser welding device for a large insulated box, characterized in that, include: The base (1) and the welding head (2) are arranged above the base (1). Each side of the surface of the base (1) is slidably mounted with a push plate (3). A first spring is provided between the push plate (3) and the base (1). An adjustment frame (7) is slidably mounted on the surface of the base (1). A slide rail (6) is slidably mounted on the inner side of the adjustment frame (7). A slide rod (5) is slidably mounted on the surface of the slide rail (6). The slide rod (5) is connected to the welding head (2).

2. The laser welding device for a large insulated box according to claim 1, characterized in that, A fixing plate (4) is slidably installed on the surface of the push plate (3). A buffer spring is provided between the fixing plate (4) and the push plate (3). A rotating ring (10) is rotatably installed on the bottom of the base (1). An arc plate (11) is installed on the surface of the rotating ring (10) near the push plate (3). A fixing rod (8) is fixedly installed on the surface of the rotating ring (10). A hook (9) is rotatably installed on the surface of the base (1).

3. The laser welding device for a large insulated box according to claim 2, characterized in that, Each side of the slide rail (6) is slidably installed on the inner wall of each side of the adjustment frame (7). The base (1) is provided with a first connecting pipe (12). One end of the first connecting pipe (12) is connected to the hook (9). The hook (9) has an air hole (15) on its surface. The air hole (15) is connected to the first connecting pipe (12) inside the hook (9). The hook (9) is connected to the slide rail (6) inside the adjustment frame (7). A stop (14) is rotatably installed on the surface of the hook (9).

4. The laser welding device for a large insulated box according to claim 3, characterized in that, A first torsion spring is provided between the hook (9) and the base (1), and a second torsion spring is provided between the stop (14) and the hook (9).

5. The laser welding device for a large insulated box according to claim 4, characterized in that, A clamp (16) is rotatably mounted on the surface of the slide rod (5). The clamp (16) is inclined. The welding head (2) is installed inside the clamp (16). A toothed rod (13) is rotatably mounted on the surface of the slide rod (5). A rack (20) is provided at each corner of the slide rail (6). A stop bar (18) is mounted on the surface of the rack (20). The rack (13) meshes with the surface of the clamp (16).

6. The laser welding device for a large insulated box according to claim 5, characterized in that, Each corner of the slide rail (6) is provided with a cover (19), the slide rod (5) is provided with a stop rod (17), and a third torsion spring is provided between the clip (16) and the slide rod (5).

7. The laser welding device for a large insulated box according to claim 6, characterized in that, A slider (21) is slidably installed below each corner of the slide rail (6). A second spring is provided between the slider (21) and the slide rail (6). The cover (19) is slidably installed on the surface of the slider (21). A third spring is provided between the cover (19) and the slider (21). A telescopic rod (22) is slidably installed on the side of the slide rail (6) adjacent to the cover (19). Several diagonal strips (23) are fixedly installed on the free end of the telescopic rod (22). The fixed end of the telescopic rod (22) is sleeved on the surface of the cover (19).

8. The laser welding device for a large insulated box according to claim 7, characterized in that, An airbag (24) is provided on the surface of the slide rail (6) near the telescopic rod (22). A pressure plate (25) is fixedly installed on the fixed end surface of the telescopic rod (22). The airbag (24) is connected to a second connecting pipe (26). A nozzle (27) is opened on the inner side of the baffle (19). The nozzle (27) and the second connecting pipe (26) are connected inside the baffle (19).

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