A welding device for electric vehicle parts production

Abstract

The present application relates to electric automobile parts processing technical field, more specifically, the present application provides a kind of welding device for electric automobile parts production, through the coordination of sliding mechanism and touch mechanism, the space synchronous following control of welding torch and rolling mechanism is realized.When welding torch is welded on the upper surface of battery box, the touch mechanism drives the connecting rod to drive the rolling mechanism to move to the welding seam directly below in real time, and the rolling pressure perpendicular to the welding seam is applied.In this process, the plastic deformation compensation of the welding seam area by the rolling mechanism can offset the welding shrinkage stress, reduce the residual stress peak of the aluminum alloy battery box, effectively inhibit the warping deformation, and ensure the assembly accuracy of battery module.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle component processing technology, and more specifically, to a welding apparatus for the production of electric vehicle parts. Background Technology

[0002] With the development of lightweight electric vehicles, aluminum alloys (such as 6-series and 5-series) have become the mainstream material for power battery boxes due to their low density and high specific strength. However, aluminum alloys have high thermal conductivity (approximately 160-220 W / m·K) and a large coefficient of thermal expansion (23.6×10⁻⁻⁻⁶). 6 / ℃), during welding, localized high temperatures (molten pool temperature > 600℃) and rapid cooling lead to significant thermal stress concentration, which in turn causes the following problems:

[0003] Battery box dimensions out of tolerance: After the residual stress from welding is released, the flatness error of the aluminum alloy battery box can reach 1-3mm / ㎡, affecting the assembly accuracy of the battery module.

[0004] Risk of sealing failure: Local deformation caused by thermal stress can lead to microcracks in the weld area, which may cause electrolyte leakage under long-term vibration load.

[0005] Decreased fatigue life: The superposition of residual tensile stress and mechanical stress from battery charge-discharge cycles accelerates fatigue crack propagation, threatening the safety of the battery system.

[0006] The solutions currently used in the industry mainly fall into the following three categories, but all of them have significant drawbacks:

[0007] 1. Post-processing methods (such as vibration aging and thermal aging): The battery box needs to be stress-relieved as a whole after welding, which takes up to 2-4 hours and cannot meet the requirements of high-efficiency production cycle (usually requiring a single-piece production cycle of <30 minutes).

[0008] 2. Welding parameter optimization method: Reduce the heat-affected zone by reducing heat input (such as pulsed MIG welding), but due to the high thermal conductivity of aluminum alloy, the actual stress reduction is limited (only 10%-15%), and may sacrifice weld penetration and strength.

[0009] 3. Composite cooling device: Water-cooled copper pad or liquid nitrogen spray forced cooling can reduce the peak temperature, but it leads to a sharp increase in temperature gradient (local temperature difference > 400℃ / mm), which in turn aggravates interlayer shear stress.

[0010] Welding-in-place rolling is an effective method for releasing thermal stress by synchronously rolling the weld area, but it faces the following challenges in battery box welding scenarios: Poor equipment compatibility: Traditional welding-in-place rolling mechanisms need to be integrated into the end effector of welding robots, occupying a large space and seriously interfering with the existing welding torch posture and path planning, resulting in high modification costs; Insufficient rolling accuracy: Battery box welds are mostly distributed in spatial curves (such as irregular splicing seams), and the rigidity and pressure control accuracy (±50N) of existing rolling wheels are difficult to adapt to complex trajectories, easily causing rolling misalignment or secondary deformation; Low production line adaptability: Power battery box production lines are mostly multi-station parallel layouts, and traditional solutions require downtime to modify welding tooling, affecting mass production efficiency.

[0011] Based on the above problems, there is an urgent need for a welding rolling mechanism that can be quickly deployed on the production line without major adjustments to the existing welding equipment, so as to achieve efficient suppression of thermal stress while ensuring the welding accuracy of aluminum alloy battery boxes. Summary of the Invention

[0012] The purpose of this invention is to provide a welding apparatus for the production of electric vehicle parts, so as to solve the problems mentioned in the background art.

[0013] To achieve the above objectives, the present invention provides the following technical solution: a welding apparatus for the production of electric vehicle parts, comprising a base and a support frame mounted on the base for supporting the parts.

[0014] A welding assembly is also installed on the side of the base. The welding assembly includes a longitudinal adjustment mechanism located on the side of the base and an actuation mechanism installed on the longitudinal adjustment mechanism.

[0015] Two sliding mechanisms are provided on the same side of the triggering mechanism. The two sliding mechanisms are respectively provided with an upper connecting rod and a lower connecting rod. One end of the upper connecting rod and the lower connecting rod is connected to a welding gun and a rolling mechanism, respectively. The welding gun and the rolling mechanism are respectively placed on the upper and lower sides of the support frame. The rolling mechanism is used to roll the weld seam on the bottom surface of the part.

[0016] A stabilizing mechanism is also connected between the other ends of the upper and lower connecting rods.

[0017] A further technical solution of this application: The triggering mechanism includes a vertical frame installed above the longitudinal adjustment mechanism and a second motor installed at the top of the vertical frame. The power output shaft of the second motor extends into the vertical frame and is connected to one end of the first screw. The other end of the first screw is connected to one end of the second screw. The threads on the outer sides of the first screw and the second screw are opposite in direction. Both the outer sides of the first screw and the second screw are fitted with longitudinal threaded sleeves.

[0018] Two sliding mechanisms are slidably installed on the same side of the vertical frame and are respectively connected to the corresponding longitudinal threaded sleeves.

[0019] A further technical solution of this application: The sliding mechanism includes a sliding sleeve that is slidably connected to the outside of the vertical frame, and the sliding sleeve is connected to the corresponding longitudinal threaded sleeve. The two ends of the sliding sleeve are open structures. The upper connecting rod and the lower connecting rod are slidably connected to the corresponding sliding sleeve. A slot is opened through the bottom of a single sliding sleeve, and several rollers are arranged in the slot. The bottom surfaces of the upper connecting rod and the lower connecting rod are respectively opened with rolling grooves, and the rollers are engaged and connected in the rolling grooves.

[0020] A further technical solution of this application: The rolling mechanism includes a mounting seat installed above one end of the lower connecting rod and two mounting slots symmetrically opened on both sides of the mounting seat. Each mounting slot is equipped with a rotating shaft seat. One end of a connecting rod is rotatably connected to the outside of the rotating shaft seat, and the other end of the connecting rod is rotatably connected to a roller.

[0021] The mounting base also has several pull-back grooves running through it. Each pull-back groove contains a pull-back spring, and the two ends of the pull-back spring are connected to the sides of the connecting rod inside the two mounting grooves.

[0022] A further technical solution of this application: The stabilizing mechanism includes an adjusting rod and an adjusting cylinder that are fitted together, with the two ends of the adjusting rod and the adjusting cylinder that are far apart from each other connected to the upper connecting rod and the lower connecting rod, respectively;

[0023] The adjusting rod is connected to a limit block at one end inside the adjusting cylinder. A through cavity is opened inside the limit block. Two movable seats are symmetrically slidably arranged inside the cavity. A retaining spring is connected between the sides of the two movable seats that are close to each other. Balls are embedded in the sides of the two movable seats that are far apart from each other. Several adjusting grooves are opened inside the adjusting cylinder corresponding to the sides of the balls, and the balls are embedded in the adjusting grooves.

[0024] A further technical solution of this application is: a stabilizing block is provided on the outside of the limiting block, and two stabilizing grooves are opened on the side of the adjusting cylinder corresponding to the stabilizing block.

[0025] A further technical solution of this application is: an adjusting cylinder is also provided on the outside of the upper sliding sleeve, and the end of the adjusting cylinder is connected to the side of the upper connecting rod.

[0026] A further technical solution of this application: The longitudinal adjustment mechanism includes a side frame disposed on the side of the base and a first motor installed at one end of the side frame. The power output shaft of the first motor extends into the side frame and is connected to a third screw. An adjusting sleeve is threadedly connected to the outside of the third screw. One end of an inner pin is connected to the outside of the adjusting sleeve. A buckle is also connected to the outer side of the side frame, and the other end of the inner pin is connected to the inside of the buckle.

[0027] The trigger mechanism is installed above the latch.

[0028] A further technical solution of this application: the lower end face of the support frame is connected to the upper surface of the base through several support rods.

[0029] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0030] Through the coordinated operation of the sliding mechanism and the triggering mechanism, spatial synchronous tracking control of the welding torch and the rolling mechanism is achieved. When the welding torch is welding on the upper surface of the battery box, the triggering mechanism drives the connecting rod to move the rolling mechanism directly below the weld in real time, applying rolling pressure perpendicular to the weld. During this process, the plastic deformation compensation of the weld area by the rolling mechanism can offset the welding shrinkage stress, reduce the residual stress peak of the aluminum alloy battery box, effectively suppress warping deformation, and ensure the assembly accuracy of the battery module.

[0031] Based on the symmetrical reverse motion of the bidirectional screw drive and the longitudinal screw sleeve, the two sliding mechanisms can synchronously and in opposite directions along the vertical frame, driving the upper and lower connecting rods to achieve mirror-symmetrical motion between the welding torch and the rolling mechanism. Combined with the low-friction sliding design of the rollers and grooves within the sliding sleeve, the trajectory of the rolling mechanism and the welding torch is ensured to remain consistent, meeting the precise following requirements of the irregularly shaped weld seams in the battery box. Simultaneously, the stabilizing mechanism, through the telescopic locking structure of the adjusting rod and adjusting cylinder, combined with the meshing positioning of the ball bearings and adjusting grooves, forms a multi-point contact rigid constraint. When the trigger mechanism drives the sliding mechanism, the stabilizing mechanism absorbs vibration energy, suppressing deviations caused by mechanical transmission gaps or external disturbances, allowing the rolling mechanism to stably conform to the lower surface of the battery box base plate, ensuring stable weld seam contact. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a top view of the structure of the present invention;

[0034] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0035] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A;

[0036] Figure 5 This is a cross-sectional structural schematic diagram of the stabilizing mechanism of the present invention;

[0037] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B;

[0038] Figure 7 This is a three-dimensional structural diagram of the present invention;

[0039] Figure 8 For the present invention Figure 7 A magnified structural diagram at point C.

[0040] Explanation of the labels in the diagram:

[0041] 1. Base; 2. Side frame; 3. First motor; 4. Lower connecting rod; 5. Adjusting cylinder; 6. Adjusting rod; 7. Upper connecting rod; 8. Adjusting cylinder; 9. Second motor; 10. Vertical frame; 11. First screw; 12. Second screw; 13. Sliding sleeve; 14. Welding torch; 15. Support frame; 16. Limiting block; 17. Stabilizing block; 18. Mounting seat; 19. Mounting groove; 20. Connecting rod; 21. Rotary shaft seat; 22. Pull-back spring; 23. Pull-back groove; 24. Roller; 25. Stabilizing groove; 26. Moving seat; 27. Pressing spring; 28. Inner cavity; 29. ​​Third screw; 30. Buckle; 31. Inner pin; 32. Adjusting screw sleeve; 33. Slot; 34. Roller; 35. Rolling groove; 36. Adjusting groove; 37. Ball bearing; 38. Support rod. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention will be further described below with reference to the embodiments.

[0043] Please see Figures 1 to 8 In one embodiment of this application, a welding apparatus for producing electric vehicle parts includes a base 1 and a support frame 15 mounted on the base 1 for supporting the parts.

[0044] A welding assembly is also installed on the side of the base 1. The welding assembly includes a longitudinal adjustment mechanism disposed on the side of the base 1 and an actuation mechanism mounted on the longitudinal adjustment mechanism.

[0045] Two sliding mechanisms are provided on the same side of the triggering mechanism. The two sliding mechanisms are respectively provided with an upper connecting rod 7 and a lower connecting rod 4. One end of the upper connecting rod 7 and the lower connecting rod 4 is connected to a welding gun 14 and a rolling mechanism, respectively. The welding gun 14 and the rolling mechanism are respectively placed on the upper and lower sides of the support frame 15. The rolling mechanism is used to roll the weld seam on the bottom surface of the part.

[0046] A stabilizing mechanism is also connected between the other ends of the upper connecting rod 7 and the lower connecting rod 4.

[0047] Furthermore, the longitudinal adjustment mechanism includes a side frame 2 disposed on the side of the base 1 and a first motor 3 installed at one end of the side frame 2. The power output shaft of the first motor 3 extends into the side frame 2 and is connected to a third screw 29. An adjusting sleeve 32 is threadedly connected to the outside of the third screw 29. One end of an inner pin 31 is connected to the outside of the adjusting sleeve 32. A buckle 30 is also connected to the outer side of the side frame 2, and the other end of the inner pin 31 is connected to the inside of the buckle 30.

[0048] The trigger mechanism is installed above the latch 30.

[0049] Furthermore, the lower end face of the support frame 15 is connected to the upper surface of the base 1 by a number of support rods 38.

[0050] This embodiment is implemented as follows: In actual use, the battery box bottom plate first needs to be placed on the support frame 15 so that the whole thing is suspended in the air and the bottom surface is exposed. As for which support frame 15 and which clamps are used for alignment and positioning, there are already a lot of existing technologies, so they will not be specifically described here.

[0051] After the installation is completed, welding is required, which is mainly achieved by welding components. The welding components are adjusted by a longitudinal adjustment mechanism to adjust their position on the side of the base 1 and control the overall position of the welding components. The triggering mechanism and the sliding mechanism work together to adjust the welding torch 14 and the rolling mechanism to move closer together. This allows for precise pre-rolling of the upper weld position on the bottom surface of the battery box base plate during the welding process. The welding torch 14 can also move and roll synchronously during the welding process. A stabilizing mechanism is also connected between the other ends of the upper connecting rod 7 and the lower connecting rod 4. This stabilizing mechanism is designed to prevent large-scale shaking when the welding torch 14 and the rolling mechanism move closer together, making the device more stable during use. The lateral adjustment of the welding position is achieved through the sliding mechanism. This allows for pre-rolling during welding and synchronous rolling during the welding process, eliminating thermal stress and improving processing accuracy.

[0052] Please see Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 As a preferred embodiment of this application, the triggering mechanism includes a vertical frame 10 mounted above the longitudinal adjustment mechanism and a second motor 9 mounted at the top of the vertical frame 10. The power output shaft of the second motor 9 extends into the vertical frame 10 and is connected to one end of a first screw 11. The other end of the first screw 11 is connected to one end of a second screw 12. The threads on the outer sides of the first screw 11 and the second screw 12 are opposite in direction. Both the outer sides of the first screw 11 and the second screw 12 are fitted with longitudinal threaded sleeves 32.

[0053] Two sliding mechanisms are slidably installed on the same side of the vertical frame 10 and are respectively connected to the corresponding longitudinal threaded sleeves 32.

[0054] Furthermore, the sliding mechanism includes a sliding sleeve 13 that is slidably connected to the outside of the vertical frame 10, and the sliding sleeve 13 is connected to the corresponding longitudinal threaded sleeve 32. The two ends of the sliding sleeve 13 are open structures. The upper connecting rod 7 and the lower connecting rod 4 are slidably connected to the corresponding sliding sleeve 13. A slot 33 is opened through the bottom of a single sliding sleeve 13. Several rollers 34 are provided in the slot 33. The bottom surfaces of the upper connecting rod 7 and the lower connecting rod 4 are respectively provided with rolling grooves 35, and the rollers 34 are connected in the rolling grooves 35.

[0055] Furthermore, an adjusting cylinder 8 is provided on the outside of the upper sliding sleeve 13, and the end of the adjusting cylinder 8 is connected to the side of the upper connecting rod 7.

[0056] This embodiment is implemented as follows: The welding assembly is specifically composed of a vertical frame 10, an upper connecting rod 7, and a lower connecting rod 4. A first screw 11 and a second screw 12 are installed inside the vertical frame 10. Both are synchronously driven by a second motor 9, thus achieving synchronous rotation. Since the outer threads of the two screws are opposite in direction, the longitudinal sleeves 32 installed on the outer sides of the first screw 11 and the second screw 12 will move in opposite directions. During the movement, they will synchronously drive the sliding mechanisms connected to them to move. The sliding mechanism is composed of a sliding sleeve 13 in conjunction with the upper connecting rod 7 and the lower connecting rod 4. The upper connecting rod 7 and the lower connecting rod 4 are respectively inserted into the two sliding sleeves 13. In this way, when the two longitudinal sleeves 32 move, they will drive the sliding sleeves 13 connected to them and the upper and lower connecting rods 4 to move. When they move closer together, they will drive the welding torch 14 and the rolling mechanism to move closer together synchronously, and vice versa.

[0057] As for adjusting the welding position, the adjusting cylinder 8 pushes out the upper connecting rod 7, which simultaneously drives the stabilizing mechanism and the lower connecting rod 4 to move. This achieves the displacement of the rolling mechanism and the welding torch 14. In order to prevent the upper connecting rod 7 and the lower connecting rod 4 from shifting or getting stuck during the pushing process, a slot 33 is opened through the bottom of the sliding sleeve 13. Several rollers 34 are set in the slot 33. The bottom surfaces of the upper connecting rod 7 and the lower connecting rod 4 are respectively opened with rolling grooves 35, and the rollers 34 are connected in the rolling grooves 35. When the upper connecting rod 7 and the lower connecting rod 4 move, the rollers 34 slide inside the rolling grooves 35, thus achieving the smooth displacement of the upper connecting rod 7 and the lower connecting rod 4.

[0058] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4As a preferred embodiment of this application, the rolling mechanism includes a mounting seat 18 installed above one end of the lower connecting rod 4 and two mounting slots 19 symmetrically opened on both sides of the mounting seat 18. A rotating shaft seat 21 is installed inside each mounting slot 19. One end of a connecting rod 20 is rotatably connected to the outside of the rotating shaft seat 21, and the other end of the connecting rod 20 is rotatably connected to a roller 24.

[0059] The mounting base 18 also has several pull-back grooves 23 running through it. Each pull-back groove 23 is equipped with a pull-back spring 22. The two ends of the pull-back spring 22 are connected to the sides of the connecting rod 20 inside the two mounting grooves 19.

[0060] This embodiment is implemented as follows: The rolling mechanism is achieved by the mounting base 18 and two rollers 24 rotatably disposed on both sides of the mounting base 18. The two rollers 24 are connected to the outer side of their respective adjacent rotating shaft seats 21 by connecting rods 20, and the connecting rods 20 are connected by pull springs 22. The height of the rollers 24 is higher than that of the mounting base 18. During the process of the welding torch 14 approaching the rolling mechanism, the rollers 24 will contact the lower surface of the battery box bottom plate in advance. After contact, the two rollers 24 will move away from each other due to the squeezing action, thus realizing the pre-rolling operation on both sides of the welding joint.

[0061] It should be noted that the installation method of the mounting base 18 and the lower connecting rod 4 is not limited. It can be either rotatable or fixed, depending on how welding is performed and the direction of welding. If the direction of movement is fixed during welding, the mounting base 18 can be set to be fixed. If the welding direction is not fixed, the mounting base 18 can be set to rotate. This ensures that when the welding torch 14 moves back and forth, the roller 24 can also drive the mounting base 18 to rotate, thus matching the trajectory of the back and forth movement of the welding torch 14.

[0062] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 As a preferred embodiment of this application, the stabilizing mechanism includes an adjusting rod 6 and an adjusting cylinder 5 that are fitted together, with the two ends of the adjusting rod 6 and the adjusting cylinder 5 that are far apart from each other connected to the upper connecting rod 7 and the lower connecting rod 4, respectively.

[0063] One end of the adjusting rod 6 located inside the adjusting cylinder 5 is also connected to a limiting block 16. A through cavity 28 is opened inside the limiting block 16. Two movable seats 26 are symmetrically slidably arranged inside the cavity 28. A retaining spring 27 is connected between the sides of the two movable seats 26 that are close to each other. A ball bearing 37 is embedded in the sides of the two movable seats 26 that are far from each other. Several adjusting grooves 36 are opened inside the adjusting cylinder 5 corresponding to the sides of the ball bearing 37, and the ball bearing 37 is embedded in the adjusting grooves 36.

[0064] Furthermore, a stabilizing block 17 is provided on the outside of the limiting block 16, and two stabilizing grooves 25 are opened inside the adjusting cylinder 5 corresponding to the side of the stabilizing block 17.

[0065] As mentioned earlier, the main function of the stabilizing mechanism is to prevent significant shaking during the process of the welding torch 14 and the rolling mechanism coming together. This is mainly achieved through the cooperation and insertion of the adjusting rod 6 and the adjusting cylinder 5. One end of the adjusting rod 6 located inside the adjusting cylinder 5 is also connected to a limiting block 16. The limiting block 16 first ensures that the adjusting rod 6 does not detach from the adjusting cylinder 5. Secondly, two movable seats 26 are set inside the limiting block 16. The two movable seats 26 are connected by a retaining spring 27. The two ends of the two movable seats 26 are embedded with balls 37. During the movement of the limiting block 16, the balls 37 can fall into the adjusting groove 36 during the movement of the movable seats 26. The retaining spring 27 will reciprocate and retract, so that the balls 37 in the movable seats 26 can switch the adjusting groove 36 back and forth, thus achieving the effect of movement and stabilization.

[0066] In summary, this invention achieves spatial synchronous following control of the welding torch 14 and the rolling mechanism through the coordinated operation of the sliding mechanism and the triggering mechanism. When the welding torch 14 is welding on the upper surface of the battery box, the triggering mechanism drives the connecting rod 4 to move the rolling mechanism directly below the weld in real time, applying a rolling force perpendicular to the weld. During this process, the plastic deformation compensation of the weld area by the rolling mechanism can offset the welding shrinkage stress, reduce the residual stress peak of the aluminum alloy battery box, effectively suppress warping deformation, and ensure the assembly accuracy of the battery module.

[0067] Based on the bidirectional screw drive and the symmetrical reverse motion of the longitudinal screw sleeve 32, the two sliding mechanisms can synchronously and in opposite directions along the vertical frame 10, driving the upper and lower connecting rods 4 to achieve mirror-symmetrical motion between the welding torch 14 and the rolling mechanism. Combined with the low-friction sliding design of the roller 34 and the groove 35 within the sliding sleeve 13, it ensures that the trajectory of the rolling mechanism and the welding torch 14 will not deviate, meeting the precise following requirements of the irregular weld seams of the battery box. Simultaneously, the stabilizing mechanism, through the telescopic locking structure of the adjusting rod 6 and the adjusting cylinder 5, combined with the meshing positioning of the ball bearing 37 and the adjusting groove 36, forms a multi-point contact rigid constraint. When the triggering mechanism drives the sliding mechanism, the stabilizing mechanism can absorb vibration energy and suppress offset caused by mechanical transmission gaps or external disturbances, allowing the rolling mechanism to stably adhere to the lower surface of the battery box bottom plate, ensuring stable weld seam adhesion.

[0068] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

[0069] 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 welding apparatus for producing electric vehicle parts, comprising a base (1) and a support frame (15) mounted on the base (1) for supporting parts, characterized in that: A welding assembly is also installed on the side of the base (1). The welding assembly includes a longitudinal adjustment mechanism disposed on the side of the base (1) and a triggering mechanism installed on the longitudinal adjustment mechanism. Two sliding mechanisms are provided on the same side of the triggering mechanism. The two sliding mechanisms are respectively provided with an upper connecting rod (7) and a lower connecting rod (4). One end of the upper connecting rod (7) and the lower connecting rod (4) is connected to a welding gun (14) and a rolling mechanism, respectively. The welding gun (14) and the rolling mechanism are respectively placed on the upper and lower sides of the support frame (15). The rolling mechanism is used to roll the weld seam on the bottom surface of the part. A stabilizing mechanism is also connected between the other ends of the upper connecting rod (7) and the lower connecting rod (4); The triggering mechanism includes a vertical frame (10) mounted above the longitudinal adjustment mechanism and a second motor (9) mounted at the top of the vertical frame (10). The power output shaft of the second motor (9) extends into the vertical frame (10) and is connected to one end of a first screw (11). The other end of the first screw (11) is connected to one end of a second screw (12). The threads on the outer sides of the first screw (11) and the second screw (12) are opposite in direction. Both the outer sides of the first screw (11) and the second screw (12) are fitted with longitudinal threaded sleeves. Two sliding mechanisms are slidably installed on the same side of the vertical frame (10) and are respectively connected to the corresponding longitudinal threaded sleeves; The sliding mechanism includes a sliding sleeve (13) that is slidably connected to the outside of the vertical frame (10) on the side, and the sliding sleeve (13) is connected to the corresponding longitudinal threaded sleeve. The two ends of the sliding sleeve (13) are open structures. The upper connecting rod (7) and the lower connecting rod (4) are slidably connected to the corresponding sliding sleeve (13). A slot (33) is opened through the bottom of a single sliding sleeve (13). Several rollers (34) are provided in the slot (33). The bottom surfaces of the upper connecting rod (7) and the lower connecting rod (4) are respectively provided with rolling grooves (35), and the rollers (34) are connected in the rolling grooves (35). The stabilizing mechanism includes an adjusting rod (6) and an adjusting cylinder (5) that are fitted together. The two ends of the adjusting rod (6) and the adjusting cylinder (5) that are far apart from each other are connected to the upper connecting rod (7) and the lower connecting rod (4), respectively. One end of the adjusting rod (6) located inside the adjusting cylinder (5) is also connected to a limiting block (16). A through cavity (28) is opened inside the limiting block (16). Two movable seats (26) are symmetrically slidably arranged inside the cavity (28). A retaining spring (27) is connected between the sides of the two movable seats (26) that are close to each other. A ball (37) is embedded in the sides of the two movable seats (26) that are far apart from each other. Several adjusting grooves (36) are opened inside the adjusting cylinder (5) corresponding to the side of the ball (37), and the ball (37) is embedded in the adjusting groove (36).

2. The welding apparatus for producing electric vehicle parts according to claim 1, characterized in that, The rolling mechanism includes a mounting seat (18) installed above one end of the lower connecting rod (4) and two mounting slots (19) symmetrically opened on both sides of the mounting seat (18). Each mounting slot (19) is equipped with a rotating shaft seat (21). One end of the connecting rod (20) is rotatably connected to the outside of the rotating shaft seat (21), and the other end of the connecting rod (20) is rotatably connected to the roller (24). The mounting base (18) also has several pull-back grooves (23) running through it. Each pull-back groove (23) is equipped with a pull-back spring (22). The two ends of the pull-back spring (22) are connected to the side of the connecting rod (20) inside the two mounting grooves (19).

3. The welding apparatus for producing electric vehicle parts according to claim 1, characterized in that, A stabilizing block (17) is provided on the outside of the limiting block (16), and two stabilizing grooves (25) are opened on the side of the adjusting cylinder (5) corresponding to the stabilizing block (17).

4. The welding apparatus for producing electric vehicle parts according to claim 3, characterized in that, An adjusting cylinder (8) is also provided on the outside of the upper sliding sleeve (13), and the end of the adjusting cylinder (8) is connected to the side of the upper connecting rod (7).

5. A welding apparatus for producing electric vehicle parts according to claim 1, characterized in that, The longitudinal adjustment mechanism includes a side frame (2) set on the side of the base (1) and a first motor (3) installed at one end of the side frame (2). The power output shaft of the first motor (3) extends into the side frame (2) and is connected to a third screw (29). An adjusting sleeve (32) is threadedly connected to the outside of the third screw (29). One end of an inner pin (31) is connected to the outside of the adjusting sleeve (32). A buckle (30) is also connected to the outer side of the side frame (2), and the other end of the inner pin (31) is connected to the inside of the buckle (30). The trigger mechanism is installed above the latch (30).

6. A welding apparatus for producing electric vehicle parts according to claim 1, characterized in that, The lower end face of the support frame (15) is connected to the upper surface of the base (1) by several support rods (38).

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