Laser welding device

Abstract

The invention relates to a laser welding device, which belongs to the technical field of welding, and comprises a workbench, a welding system is arranged on the workbench, the welding system is used for executing laser welding, and a first fixing mechanism and a second fixing mechanism are arranged on the workbench. The first fixing mechanism and the second fixing mechanism are located on the two sides of the welding system correspondingly. The first fixing mechanism comprises a fixing frame, a fixing seat is arranged on the side, close to the welding system, of the fixing frame, and a fixing rod is horizontally arranged between the fixing seat and the fixing frame and is parallel to the distribution direction of the first fixing mechanism and the second fixing mechanism. By wrapping and positioning the capacitor box shell, deformation of the capacitor box body in the welding process is avoided, impurities at the welding position of the box body and the box cover can be blown away under the action of airflow during the abutting period of the box body and the box cover, and the impurities are prevented from affecting the laser welding effect.

Description

Technical Field

[0001] This invention relates to a laser welding device, belonging to the field of welding technology. Background Technology

[0002] Capacitor enclosures are typically the external protective structure of capacitors, primarily used to protect the internal components and ensure their safe and stable operation. Common materials for capacitor enclosures include metal and plastic, with the specific choice depending on the type of capacitor and the application environment. During the manufacturing process, capacitor enclosures are usually produced using laser welding equipment.

[0003] Chinese invention patent CN120080003A discloses a modularly designed laser welding machine and its usage method. The machine includes a bed frame with symmetrically mounted vertical supports on both sides. A horizontal frame is positioned between the two vertical supports. Each vertical support has a first linear drive device that drives the horizontal frame to move up and down. A mounting shaft is rotatably mounted in the middle of the horizontal frame. The top of the mounting shaft is driven to rotate by the drive device, and the bottom of the mounting shaft is vertically connected to the middle of the horizontal mounting frame. A second linear drive device is mounted at the bottom of the horizontal mounting frame. A six-axis robotic arm is located below the mounting base, and a laser welding gun is mounted on the free end of the six-axis robotic arm. In use, the six-axis robotic arm can move horizontally left and right, as well as up and down, and can rotate omnidirectionally around the workpiece. This eliminates dead zones and allows the six-axis robotic arm to reach any position on the workpiece, resulting in a wide welding range for the laser welding gun. However, in the existing technology, when laser welding thin-walled capacitor box shells, the high-energy laser beam will heat the local area to a high temperature, causing the material to expand. When the laser beam is removed, the heat will be quickly dissipated, causing the material to cool and shrink locally. If the welding area is large or the temperature difference is too large, it may cause thermal deformation of the workpiece.

[0004] Therefore, a laser welding device is needed to prevent deformation of the capacitor box shell during welding. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a laser welding device that avoids deformation during the welding of capacitor box shells in order to overcome the shortcomings of the prior art.

[0006] The technical solution adopted by the present invention to solve the above problems is as follows: a laser welding device, including a worktable, a welding system is provided on the worktable, the welding system is used to perform laser welding, and a first fixing mechanism and a second fixing mechanism are provided on the worktable, the first fixing mechanism and the second fixing mechanism are respectively located on both sides of the welding system; The first fixing mechanism includes a fixing frame, a fixing seat is provided on the side of the fixing frame near the welding system, a fixing rod is provided between the fixing seat and the fixing frame, the fixing rod is arranged horizontally, the fixing rod is parallel to the distribution direction of the first fixing mechanism and the second fixing mechanism, the two ends of the fixing rod are respectively fixedly mounted on the fixing frame and the fixing seat, a movable cover is movably sleeved on the fixing seat, and a movable module is connected to the movable cover, the movable cover is moved towards or away from the second fixing mechanism by the movable module; The second fixing mechanism includes a movable base and a placement tray. The movable base is slidably connected to the worktable. A drive system is connected to the movable base, which moves the movable base closer to or away from the first fixing mechanism. The placement tray is located above the movable base. The side of the placement tray closest to the first fixing mechanism is recessed to form a placement groove. A rotating shaft is fixedly installed on the other side of the placement tray. The rotating shaft is parallel to the distribution direction of the first and second fixing mechanisms. A through hole is provided on the side of the rotating shaft away from the first fixing mechanism, and the through hole extends into the placement groove. A rotating support is provided on the movable base, and the rotating support is rotatably connected to the rotating shaft, which supports the rotating shaft. A moving rod is coaxially inserted into the end of the through hole away from the first fixing mechanism. The moving rod slides and is sealed to the inner wall of the through hole. A second cylinder is connected to the moving rod, which drives the moving rod to move closer to or away from the second fixing mechanism. A drive system is connected to the rotating shaft, which enables the rotating shaft to rotate.

[0007] Preferably, the worktable is provided with a guide groove, and the movable seat is fixedly provided with a guide block. The guide groove is parallel to the distribution direction of the first fixing mechanism and the second fixing mechanism. The guide block is inserted into the guide groove and the guide block matches the guide groove.

[0008] Preferably, the guide groove is a dovetail groove.

[0009] Preferably, the welding system includes a welding frame and a laser welding head, wherein the welding frame is fixedly mounted on the worktable and the welding head is fixedly mounted on the welding frame.

[0010] Preferably, the fixed seat includes a seat body and a flange. The seat body is cylindrical, and the flange is disposed on the outer peripheral wall of the seat body. The inner peripheral wall of the movable cover is in contact with the outer peripheral wall of the flange.

[0011] Preferably, the movable module includes a lead screw, which is parallel to the distribution direction of the first fixing mechanism and the second fixing mechanism. The lead screw is threadedly connected to the movable cover, and one end of the lead screw is driven by a movable motor.

[0012] Preferably, a first air hole is provided at one end of the fixed base near the second fixing mechanism, the first air hole extends to the side of the fixed frame away from the second fixing mechanism, and the end of the first air hole away from the second fixing mechanism is connected to the air supply system.

[0013] Preferably, the fixed base is provided with a second air hole and an air groove at one end near the second fixing mechanism. The second air hole extends to the other end of the fixed base, and the air groove is located between the first air hole and the second air hole. The two ends of the air groove are respectively connected to the first air hole and the second air hole.

[0014] Preferably, the movable cover includes a tube body and a connecting part. The connecting part is annular, and the connecting ring is coaxially fixed on the side of the tube body away from the second fixing mechanism. The connecting part is gapped on the fixing rod, and the tube body is fitted on the fixing seat. The distance between the second air hole and the axis of the fixing seat is greater than the radius of the connecting part.

[0015] Preferably, the workbench is provided with a feeding port.

[0016] Compared with the prior art, the advantages of the present invention are as follows: This invention discloses a laser welding device that, by wrapping and positioning the capacitor box shell, prevents deformation of the capacitor box during the welding process. Furthermore, during the contact between the box shell and the cover, the airflow can blow away impurities at the welding position, preventing impurities from affecting the laser welding effect. In addition, the airflow during welding not only prevents deformation of the fixed base and moving cover due to high temperature, but also improves the uniformity of cooling of the box shell and cover, ensuring the production quality of the capacitor box shell. Attached Figure Description

[0017] Figure 1 This is a perspective view of a laser welding apparatus according to the present invention; Figure 2 This is a front view of a laser welding apparatus according to the present invention; Figure 3 This is a top view of a laser welding apparatus according to the present invention; Figure 4 Exploded view of the first fixed mechanism; Figure 5 A schematic diagram of the connection structure of the fixing frame, fixing rod and fixing base; Figure 6 for Figure 5 A sectional view; Figure 7 This is a schematic diagram of the connection structure between the movable cover and the movable module. Figure 8 This is a schematic diagram of the second fixing mechanism; Figure 9 for Figure 8 A sectional view; Figure 10 This is a schematic diagram of the structure for placing the tray.

[0018] in: 1. Workbench; 2. Welding system; 3. First fixing mechanism; 4. Second fixing mechanism; 5. Guide groove; 6. Box body; 7. Box cover; 8. Discharge port. Welding frame 21, laser welding head 22; Fixed frame 31, fixed base 32, fixed rod 33, movable cover 34, movable module 35, first air hole 36, second air hole 37, air groove 38; Body 321, flange 322; Pipe body part 341, connection part 342; Lead screw 351, moving motor 352; The components include a movable seat 41, a placement plate 42, a first cylinder 43, a placement groove 44, a rotating shaft 45, a through hole 46, a rotating support seat 47, a moving rod 48, a second cylinder 49, and a guide block 40. Detailed Implementation

[0019] like Figure 1-10 As shown, a laser welding device in this embodiment includes a worktable 1, a welding system 2 is provided on the worktable 1, the welding system 2 is used to perform laser welding, and a first fixing mechanism 3 and a second fixing mechanism 4 are provided on the worktable 1, the first fixing mechanism 3 and the second fixing mechanism 4 are respectively located on both sides of the welding system 2. The first fixing mechanism 3 includes a fixing frame 31. A fixing seat is provided on the side of the fixing frame 31 near the welding system 2. A fixing rod 33 is provided between the fixing seat and the fixing frame 31. The fixing rod 33 is arranged horizontally and is parallel to the distribution direction of the first fixing mechanism 3 and the second fixing mechanism 4. The two ends of the fixing rod 33 are respectively fixed on the fixing frame 31 and the fixing seat. A movable cover 34 is movably sleeved on the fixing seat. A movable module 35 is connected to the movable cover 34. The movable cover 34 can be moved closer to or away from the second fixing mechanism 4 through the movable module 35. The second fixing mechanism 4 includes a movable base 41 and a placement tray 42. The movable base 41 is slidably connected to the worktable 1. A drive system is connected to the movable base 41, which moves the movable base 41 towards or away from the first fixing mechanism 3. Here, the drive system is a first cylinder 43, and multiple first cylinders 43 are arranged side by side. The placement tray 42 is located above the movable base 41. The side of the placement tray 42 closest to the first fixing mechanism 3 forms a placement groove 44. A rotating shaft 45 is fixedly installed on the other side of the placement tray 42. The rotating shaft 45 is parallel to the distribution direction of the first fixing mechanism 3 and the second fixing mechanism 4. A through hole 46 is provided on the side of the rotating shaft 45 away from the first fixing mechanism 3, and the through hole 46 extends into the placement groove 44. A rotating support 47 is provided on the movable base 41, and the rotating support 47 is rotatably connected to the rotating shaft 45. The rotating shaft 45 is supported by the rotating support base 47. A movable rod 48 is coaxially inserted into the end of the through hole 46 away from the first fixed mechanism 3. The movable rod 48 slides and is sealed to the inner wall of the through hole 46. A second cylinder 49 is connected to the movable rod 48. The second cylinder 49 is used to drive the movable rod 48 to move closer to or away from the second fixed mechanism 4. A drive system is connected to the rotating shaft 45. The drive system is used to realize the rotation of the rotating shaft 45. Here, the drive system can be a motor and gear transmission assembly. When the motor drives, the rotating shaft 45 is driven to rotate through the gear transmission. The drive system can also be a motor and belt transmission. When the motor drives, the rotating shaft 45 is rotated through the belt transmission. Of course, the drive system can also be other forms, as long as it realizes the rotation of the rotating shaft 45. In addition, it should be noted that the through hole 46 and the movable rod 48 are both arranged coaxially with the rotating shaft 45, and the movable rod 48 is cylindrical. The workbench 1 is provided with a guide groove 5, and the movable seat 41 is fixedly provided with a guide block 40. The guide groove 5 is parallel to the distribution direction of the first fixing mechanism 3 and the second fixing mechanism 4. The guide block 40 is inserted into the guide groove 5 and the guide block 40 matches the guide groove 5. The guide groove 5 is a dovetail groove. The welding system 2 includes a welding frame 21 and a laser welding head 22. The welding frame 21 is fixedly mounted on the workbench 1, and the welding head is fixedly mounted on the welding frame 21. Here, the capacitor box housing includes a tubular box body 6 and a disc-shaped box cover 7, while the fixing base is a cylinder that matches the inner cavity of the box body 6, the inner cavity of the movable cover 34 matches the outer wall of the box body 6, the placement groove 44 matches the box cover 7, and the groove depth of the placement groove 44 is less than the thickness of the box cover 7. During operation, the lid 7 is placed in the placement slot 44, sealing one end of the lid 7 against the through hole 46. Then, the first cylinder 43 drives the moving rod 48 to move away from the first fixing mechanism 3, reducing the air pressure in the through hole 46, thus causing the lid 7 to adhere to the placement slot 44 and be fixed. The box body 6 is then fitted onto the end of the fixing seat near the second fixing mechanism 4, with the inner wall of the box body 6 fitting against the fixing seat. Next, the moving module 35 moves the moving cover 34 towards the second fixing mechanism 4, fitting the moving cover 34 onto the box body 6, with the inner wall of the moving cover 34 fitting against the outer wall of the box body 6. At this point, the lid 7 and the box body 6 are facing each other. Then, the first cylinder 43 drives the moving seat 41 towards the first fixing mechanism 3. The movement of the moving seat 41 drives the rotating shaft 45 to move synchronously via the rotating support 47, thus achieving placement. The tray 42 and the lid 7 are moved until the lid 7 abuts against one end of the box body 6. At the same time, the lid 7 is also in contact with the fixed seat. At this time, the abutment position of the lid 7 and the box body 6 is between the moving cover 34 and the tray 42. The distance between the moving cover 34 and the tray 42 can be adjusted according to the laser welding width. Specifically, the moving module 35 only needs to control the moving distance of the moving cover 34. In addition, at this time, the abutment position of the lid 7 and the box body 6 is at the laser welding head 22. When the laser welding head 22 is started, laser welding is performed on the abutment position of the box body 6 and the lid 7. At the same time, the rotating shaft 45 rotates, causing the lid 7 on the tray 42 to rotate. Since the abutment position of the box body 6 and the lid 7 has been fixed by laser welding at one point, the lid 7 rotates while driving the box body 6 to rotate synchronously. In this way, it is convenient for the laser welding head 22 to weld the different abutments of the lid 7 and the box body 6 until all welding is completed. After welding is completed, the first cylinder 43 drives the moving seat 41 to move in the opposite direction to achieve reset. In this way, the cover 7 moves in the opposite direction to achieve reset. During the reverse movement of the cover 7, the box body 6 moves synchronously and separates from the fixed seat and the moving cover 34 respectively. Then, the moving module 35 drives the moving cover 34 to move in the opposite direction to achieve reset, and the second cylinder 49 drives the moving rod 48 to move in the opposite direction, so that the through hole 46 stops adsorbing the cover 7. That is, the box body 6 and the cover 7 after welding can be removed from the placement plate 42 for the next laser welding operation of the capacitor box shell. Here, during the laser welding process, the cover 7 is clamped and fitted by the welding seat and the placement plate 42. Because the inner wall of the box 6 is fitted with the fixed seat and the inner wall of the movable cover 34 is fitted with the outer wall of the box 6, the capacitor box shell is wrapped and positioned, preventing the capacitor box 6 from deforming during the welding process. The distance between the movable cover 34 and the placement plate 42 can be adjusted according to the laser welding width, which can minimize the area of ​​the capacitor box shell directly exposed to the outside and ensure the effect of preventing deformation. The fixed base includes a base body 321 and a flange 322. The base body 321 is cylindrical, and the flange 322 is disposed on the outer peripheral wall of the base body 321. The inner peripheral wall of the movable cover 34 is in contact with the outer peripheral wall of the flange 322. When the box 6 is fitted on the fixed base, the box 6 is actually fitted on the base body 321, and the end of the box 6 away from the second fixing mechanism 4 abuts against the flange 322 to achieve the positioning of the box 6. The movable module 35 includes a lead screw 351, which is parallel to the distribution direction of the first fixing mechanism 3 and the second fixing mechanism 4. The lead screw 351 is threadedly connected to the movable cover 34. One end of the lead screw 351 is driven by a movable motor 352. During the start-up process of the movable motor 352, the lead screw 351 is rotated, and the movable cover 34 is moved by the rotation of the lead screw 351. The fixed base is provided with a first air hole 36 at one end near the second fixing mechanism 4. The first air hole 36 extends to the side of the fixed frame 31 away from the second fixing mechanism 4. The end of the first air hole 36 away from the second fixing mechanism 4 is connected to the air supply system. During welding, air is delivered to the first air hole 36 through the air supply system and then discharged. When the box cover 7 is attached to the box body 6, the air discharged from the first air hole 36 enters between the fixed base and the box cover 7 and disperses along the axis of the fixed base. In this way, under the action of the airflow, impurities at the welding position of the box body 6 and the box cover 7 can be blown away, avoiding impurities from affecting the laser welding effect. The fixed base is provided with a plurality of second air holes 37 and a plurality of air grooves 38 at one end near the second fixing mechanism 4. The plurality of second air holes 37 are evenly distributed circumferentially around the first air hole 36 as the center. The second air holes 37 extend to the other end of the fixed base. The plurality of air grooves 38 correspond one-to-one with the plurality of second air holes 37. The air grooves 38 are located between the first air hole 36 and the second air hole 37. The two ends of the air grooves 38 are respectively connected to the first air hole 36 and the second air hole 37. When the box body 6 and the box cover 7 are abutted and welded, the air discharged from the first air hole 36 is transported from the air groove 38 to the second air hole 37 and then discharged. Under the action of the airflow, the heat generated during the welding process can be discharged, avoiding deformation of the fixed base due to high temperature, that is, further avoiding deformation of the capacitor box shell. The movable cover 34 includes a tube body 341 and a connecting part 342. The connecting part 342 is annular. The connecting ring is coaxially fixed on the side of the tube body 341 away from the second fixing mechanism 4. The connecting part 342 is loosely sleeved on the fixing rod 33. The tube body 341 is sleeved on the fixing seat. The distance between the second air hole 37 and the axis of the fixing seat is greater than the radius of the connecting part 342. The air discharged from the second air hole 37 can also act on the connecting part 342, which can dissipate the heat on the movable cover 34 and avoid deformation of the movable cover 34 due to high temperature, that is, further avoid deformation of the capacitor box shell. In addition, it should be noted that the airflow can also improve the uniformity of cooling of the enclosure 6 and the cover 7, ensuring the production quality of the capacitor enclosure. The workbench 1 is provided with a feeding port. During operation, a collection container can be placed at the feeding port. When welding is completed and the box 6 is separated from the fixed base, the through hole 46 stops adsorbing the box cover 7, and the box 6 and the box cover 7 fall off and are collected in the collection container from the feeding port. In summary, by achieving the enclosure and positioning of the capacitor box shell, deformation of the capacitor box body 6 during the welding process is avoided. Furthermore, during the contact between the box body 6 and the cover 7, the airflow can blow away impurities at the welding position of the box body 6 and the cover 7, preventing impurities from affecting the laser welding effect. In addition, during welding, the airflow can not only prevent deformation of the fixed seat and the moving cover 34 caused by high temperature, but also improve the uniformity of cooling of the box body 6 and the cover 7, ensuring the production quality of the capacitor box shell.

[0020] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A laser welding apparatus, comprising a worktable (1), wherein a welding system (2) is disposed on the worktable (1), the welding system (2) being used to perform laser welding actions, characterized in that: The workbench (1) is provided with a first fixing mechanism (3) and a second fixing mechanism (4), which are located on both sides of the welding system (2). The first fixing mechanism (3) includes a fixing frame (31). A fixing seat is provided on the side of the fixing frame (31) near the welding system (2). A fixing rod (33) is provided between the fixing seat and the fixing frame (31). The fixing rod (33) is arranged horizontally and is parallel to the distribution direction of the first fixing mechanism (3) and the second fixing mechanism (4). The two ends of the fixing rod (33) are respectively fixed on the fixing frame (31) and the fixing seat. A movable cover (34) is movably sleeved on the fixing seat. A movable module (35) is connected to the movable cover (34). The movable cover (34) can be moved closer to or away from the second fixing mechanism (4) through the movable module (35). The second fixing mechanism (4) includes a movable seat (41) and a placement tray (42). The movable seat (41) is slidably connected to the worktable (1). A drive system is connected to the movable seat (41), which enables the movable seat (41) to move closer to or away from the first fixing mechanism (3). The placement tray (42) is located above the movable seat (41). The side of the placement tray (42) closest to the first fixing mechanism (3) is recessed to form a placement groove (44). A rotating shaft (45) is fixedly provided on the other side of the placement tray (42). The rotating shaft (45) is parallel to the distribution direction of the first fixing mechanism (3) and the second fixing mechanism (4). A through hole (46) is provided on the side of the rotating shaft (45) away from the first fixing mechanism (3). The through hole (46) extends into the placement groove (44). A rotating support (47) is provided on the movable seat (41). The rotating support (47) is rotatably connected to the rotating shaft (45). The rotating shaft (45) is supported by the rotating support (47). A movable rod (48) is coaxially inserted at the end of the through hole (46) away from the first fixing mechanism (3). The movable rod (48) slides and is sealed to the inner wall of the through hole (46). A second cylinder (49) is connected to the movable rod (48). The second cylinder (49) is used to drive the movable rod (48) to move closer to or away from the second fixing mechanism (4). A drive system is connected to the rotating shaft (45). The drive system is used to realize the rotation of the rotating shaft (45).

2. The laser welding apparatus according to claim 1, characterized in that: The workbench (1) is provided with a guide groove (5), and the movable seat (41) is fixedly provided with a guide block (40). The guide groove (5) is parallel to the distribution direction of the first fixing mechanism (3) and the second fixing mechanism (4). The guide block (40) is inserted into the guide groove (5) and the guide block (40) matches the guide groove (5).

3. The laser welding apparatus according to claim 2, characterized in that: The guide groove (5) is a dovetail groove.

4. The laser welding apparatus according to claim 1, characterized in that: The welding system (2) includes a welding frame (21) and a laser welding head (22). The welding frame (21) is fixedly mounted on the workbench (1), and the welding head is fixedly mounted on the welding frame (21).

5. The laser welding apparatus according to claim 1, characterized in that: The fixed seat includes a seat body (321) and a flange (322). The seat body (321) is cylindrical, and the flange (322) is disposed on the outer peripheral wall of the seat body (321). The inner peripheral wall of the movable cover (34) is in contact with the outer peripheral wall of the flange (322).

6. The laser welding apparatus according to claim 1, characterized in that: The moving module (35) includes a lead screw (351), which is parallel to the distribution direction of the first fixing mechanism (3) and the second fixing mechanism (4). The lead screw (351) is threadedly connected to the moving cover (34), and one end of the lead screw (351) is driven by a moving motor (352).

7. The laser welding apparatus according to claim 1, characterized in that: The fixed base is provided with a first air hole (36) at one end near the second fixing mechanism (4). The first air hole (36) extends to the side of the fixed frame (31) away from the second fixing mechanism (4). The end of the first air hole (36) away from the second fixing mechanism (4) is connected to the air supply system.

8. The laser welding apparatus according to claim 7, characterized in that: The fixed base is provided with a second air hole (37) and an air groove (38) at one end near the second fixing mechanism (4). The second air hole (37) extends to the other end of the fixed base. The air groove (38) is located between the first air hole (36) and the second air hole (37). The two ends of the air groove (38) are respectively connected to the first air hole (36) and the second air hole (37).

9. A laser welding apparatus according to claim 8, characterized in that: The movable cover (34) includes a tube body (341) and a connecting part (342). The connecting part (342) is annular. The connecting ring is coaxially fixed on the side of the tube body (341) away from the second fixing mechanism (4). The connecting part (342) is gapped on the fixing rod (33). The tube body (341) is fitted on the fixing seat. The distance between the second air hole (37) and the axis of the fixing seat is greater than the radius of the connecting part (342).

10. A laser welding apparatus according to claim 1, characterized in that: The workbench (1) is provided with a feeding port.

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