Movable resistance welding device

Abstract

The utility model discloses a movable resistance welding device, which belongs to the technical field of resistance welding devices and comprises a mechanical arm, a supporting arm mechanism is arranged at the end of the mechanical arm, an upper welding mechanism is arranged at one end of the supporting arm mechanism, and a lower static arm seat is arranged at the other end of the supporting arm mechanism. A lower electrode cap is fixedly installed on the top face of the lower static arm seat, and a supporting disc is fixedly connected to the top face of the lower static arm seat. When resistance welding is carried out on a metal plate, the metal plate is placed on the supporting disc, the supporting column and the rubber insulation pad on the top face of the lower static arm seat, the metal plate is horizontally supported through the supporting disc, the supporting column and the rubber insulation pad, and meanwhile the top end of the lower electrode cap makes contact with the bottom face of the metal plate. And the levelness of the metal plate subjected to resistance welding is ensured, so that the resistance welding quality is ensured, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance welding devices, and more specifically, to a mobile resistance welding device. Background Art

[0002] In the manufacturing and processing industry, studs and nuts need to be welded on metal product components such as sheet metal parts. The welded studs and nuts are connected and fastened to other parts by threads. Among them, resistance welding of studs and nuts is a common welding method.

[0003] After retrieval, the utility model patent with the publication number of CN220480526U discloses a mobile resistance welding device, which includes a movable arm and a resistance spot welding tongs installed on the movable arm. The resistance spot welding tongs include a movable arm and a static arm. Electrodes are provided on both the movable arm and the static arm. An electrode cap is provided at the end of the electrode on the movable arm, and a locking mechanism for locking the workpiece in the receiving groove is provided on the electrode cap. By arranging the resistance spot welding tongs on the movable arm that can be controlled to move, and an electrode cap for grasping workpieces such as studs or nuts is provided on the resistance spot welding tongs, and by driving the resistance spot welding tongs to move to the required welding position on the sheet metal part for resistance spot welding, the resistance welding of studs or nut workpieces at different positions on the sheet metal part is realized, thereby improving work efficiency and welding quality; the precise positioning of the electrode and the workpiece during welding is realized with high precision, and the corresponding posture can be adjusted according to different welding positions or angles for welding.

[0004] However, the above patent still has the following deficiencies: When performing resistance welding on a sheet metal plate, only the electrode cap on the lower static arm is relied on to support the sheet metal plate, which is not convenient for ensuring the flatness of the plate, and thus affects the welding angle of nuts or screws; and some sheet metal plates are relatively large in width or length, and the interval inside the static arm and the movable arm is limited, which only facilitates resistance welding of a certain area on the side of the sheet metal plate, and the use limitation is relatively large. For this reason, we propose a mobile resistance welding device. Summary of the Utility Model

[0005] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a mobile resistance welding device.

[0006] To solve the above problems, the utility model adopts the following technical solutions:

[0007] A mobile resistance welding device includes a robotic arm, and a support arm mechanism is provided at the end of the robotic arm. An upper welding mechanism is provided at one end of the support arm mechanism, and a lower static arm seat is provided at the other end of the support arm mechanism. A lower electrode cap is fixedly installed on the top surface of the lower static arm seat. A support disk is fixedly connected to the top surface of the lower static arm seat. A plurality of support columns are fixedly connected to the top surface of the support disk. The top ends of the plurality of support columns are fixedly connected with a rubber insulating pad. A through hole is formed in the middle of the support disk, and the lower electrode cap extends through the inner cavity of the through hole to the top of the support disk.

[0008] As a preferred solution of the present invention, the support arm mechanism includes a U-shaped frame fixedly connected to the end of the robotic arm. Telescopic grooves are respectively formed at both ends of the U-shaped frame. A transmission groove is provided between the two telescopic grooves. Screws are respectively rotatably connected to the inner sides of the two telescopic grooves. Moving frames are respectively threadedly sleeved on the outer sides of the two screws. One end of one moving frame extends to the outside of the U-shaped frame and is fixedly connected to the lower static arm seat. Synchronous wheels are respectively fixedly sleeved on the outer sides of the two screws. A synchronous belt is drivingly connected between the two synchronous wheels. The synchronous belt passes through the inner cavity of the transmission groove. A servo motor is fixedly installed at the end of the U-shaped frame. The output shaft of the servo motor is connected to one end of a screw.

[0009] As a preferred solution of the present invention, the upper welding mechanism includes an upper moving arm seat fixedly connected to the end of the other moving frame. A hydraulic cylinder is fixedly installed on the upper moving arm seat. The output end of the hydraulic cylinder extends to the bottom of the upper moving arm seat and is fixedly connected to a mounting seat. An upper electrode sleeve is fixedly connected to the bottom surface of the mounting seat. A screw is sleeved at the bottom end of the upper electrode sleeve.

[0010] As a preferred solution of the present invention, the side surface of the moving frame is in contact with the inner wall of the telescopic groove.

[0011] As a preferred solution of the present invention, the lower electrode cap and the upper electrode sleeve are concentrically arranged.

[0012] As a preferred solution of the present invention, the top surface of the lower electrode cap is flush with the top surface of the rubber insulating pad.

[0013] Compared with the prior art, the advantages of the present invention are as follows:

[0014] (1) In the present invention, when resistance welding a sheet metal plate, the sheet metal plate is placed on the support disk, the support columns and the rubber insulating pad on the top surface of the lower static arm seat. The support disk, the support columns and the rubber insulating pad are used to horizontally support the sheet metal plate, and at the same time, the top end of the lower electrode cap is in contact with the bottom surface of the sheet metal plate, ensuring the flatness of the sheet metal plate for resistance welding, thereby ensuring the quality of resistance welding and improving its practicability.

[0015] (2) In the present utility model, when the sheet is placed inside the U-shaped frame, a servo motor is used to drive a screw to rotate. At the same time, the transmission between the synchronous pulley and the synchronous belt drives two screws to move synchronously. The threaded fit between the screw and the moving frame can drive the lower static arm seat and the upper moving arm seat to move synchronously, so as to move the lower electrode cap and the upper electrode sleeve to the middle position of the sheet metal plate, thereby realizing welding at the middle position of the sheet metal plate, avoiding the problem that the existing interval inside the static arm and the moving arm is limited and only facilitating resistance welding in a certain area on the side of the sheet metal plate, and improving its practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a schematic diagram of the structure of the U-shaped frame of the present utility model;

[0018] Figure 3 is a schematic cross-sectional view of the U-shaped frame of the present utility model;

[0019] Figure 4 is a schematic diagram of the structure of the support disc of the present utility model.

[0020] Explanation of the reference numerals in the figure: 1. robotic arm; 2. support arm mechanism; 3. upper welding mechanism; 4. lower static arm seat; 5. lower electrode cap; 6. support disc; 7. support column; 8. rubber insulating pad; 9. perforation; 10. U-shaped frame; 11. telescopic groove; 12. transmission groove; 13. screw; 14. moving frame; 15. servo motor; 16. synchronous pulley; 17. synchronous belt; 18. upper moving arm seat; 19. hydraulic cylinder; 20. mounting seat; 21. upper electrode sleeve; 22. screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Example:

[0025] See also Figures 1-4 A mobile resistance welding device comprises a mechanical arm 1, a support arm mechanism 2 is arranged at the end of the mechanical arm 1, an upper welding mechanism 3 is arranged at one end of the support arm mechanism 2, a lower static arm seat 4 is arranged at the other end of the support arm mechanism 2, a lower electrode cap 5 is fixedly installed on the top surface of the lower static arm seat 4, a support plate 6 is fixedly connected to the top surface of the lower static arm seat 4, a plurality of support columns 7 are fixedly connected to the top surface of the support plate 6, a rubber insulating pad 8 is fixedly connected to the top of the plurality of support columns 7, a through hole 9 is opened in the middle of the support plate 6, and the lower electrode cap 5 passes through the inner cavity of the through hole 9 and extends to the top of the support plate 6.

[0026] For details, please refer to Figures 1 to 3 The support arm mechanism 2 includes a U-shaped frame 10 fixedly connected to the end of the mechanical arm 1, and telescopic grooves 11 are respectively opened at both ends of the U-shaped frame 10, and a transmission groove 12 is arranged between the two telescopic grooves 11. The inner sides of the two telescopic grooves 11 are rotatably connected with screws 13, and the outer sides of the two screws 13 are respectively threadedly sleeved with moving frames 14. One end of a moving frame 14 extends to the outside of the U-shaped frame 10 and is fixedly connected to the lower static arm seat 4. The outer sides of the two screws 13 are respectively fixedly sleeved with synchronous wheels 16, and a synchronous belt 17 is transmission-connected between the two synchronous wheels 16. The synchronous belt 17 passes through the inner cavity of the transmission groove 12. A servo motor 15 is fixedly installed at the end of the U-shaped frame 10, and the output shaft of the servo motor 15 is connected to one end of a screw 13.

[0027] In this embodiment, the threaded fit between the screw rod 13 and the moving frame 14 drives the upper moving arm seat 18 and the lower static arm seat 4 to move horizontally synchronously, so as to place the lower electrode cap 5 and the upper electrode sleeve 21 at appropriate positions on the bottom and top of the inner sheet metal of the U-shaped frame 10.

[0028] Specifically, please refer to Figure 1 and Figure 2 , the upper welding mechanism 3 includes an upper moving arm seat 18 fixedly connected to the end of another moving frame 14. A hydraulic cylinder 19 is fixedly installed on the upper moving arm seat 18. The output end of the hydraulic cylinder 19 extends to the bottom of the upper moving arm seat 18 and is fixedly connected with a mounting seat 20. The bottom surface of the mounting seat 20 is fixedly connected with an upper electrode sleeve 21, and a screw 22 is sleeved at the bottom end of the upper electrode sleeve 21.

[0029] In this embodiment, the hydraulic cylinder 19 drives the mounting seat 20, the upper electrode sleeve 21 and the screw 22 to move, so that the screw 22 can be projection welded on the sheet metal. In addition, the upper electrode sleeve 21 can be replaced, so that nuts can be projection welded. This is the prior art.

[0030] Specifically, please refer to Figure 3 , the side surface of the moving frame 14 is in contact with the inner wall of the telescopic groove 11.

[0031] In this embodiment, the inner wall of the telescopic groove 11 is used to limit the moving frame 14, so that the moving frame 14 can only move along the axial direction of the screw rod 13.

[0032] Specifically, please refer to Figure 2 , the lower electrode cap 5 and the upper electrode sleeve 21 are concentrically arranged.

[0033] In this embodiment, it is ensured that the sheet metal can be smoothly spot welded between the lower electrode cap 5 and the upper electrode sleeve 21.

[0034] Specifically, please refer to Figure 1 , Figure 2 and Figure 4 , the top surface of the lower electrode cap 5 is flush with the top surface of the rubber insulating pad 8.

[0035] In this embodiment, when the rubber insulating pad 8 supports the sheet metal, it is ensured that the top end of the lower electrode cap 5 can be in contact with the bottom surface of the sheet metal, ensuring the smooth progress of resistance welding.

[0036] Working principle: When in use, first place the sheet metal plate inside the U-shaped frame 10. At the same time, start the servo motor 15 to drive a screw rod 13 to rotate. Utilize the transmission between the synchronous pulley 16 and the synchronous belt 17 to drive the two screw rods 13 to rotate synchronously. Drive the two moving frames 14 to move outward through the threaded fit between the screw rod 13 and the moving frame 14. Drive the lower static arm seat 4 and the upper moving arm seat 18 to move respectively by means of the two moving frames 14, so that the lower static arm seat 4 and the upper moving arm seat 18 move to the lower and upper positions of the sheet metal plate where resistance welding is required respectively. Then place the sheet metal plate on the support columns 7 and the rubber insulating pads 8 on the top of the support plate 6. Horizontally support the sheet metal plate by means of the support plate 6, the support columns 7 and the rubber insulating pads 8. At the same time, the top end of the lower electrode cap 5 is in contact with the bottom surface of the sheet metal plate. Finally, start the hydraulic cylinder 19 to drive the mounting seat 20, the upper electrode sleeve 21 and the screw 22 to move downward, so as to weld the screw 22 on the sheet metal plate, and that's it.

[0037] The above is only the preferred specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improved concept, makes equivalent replacement or change, and should be covered by the protection scope of the present utility model.

Claims

1. A mobile resistance welding device, comprising a mechanical arm (1), characterized in that: A support arm mechanism (2) is provided at the end of the mechanical arm (1), an upper welding mechanism (3) is provided at one end of the support arm mechanism (2), a lower static arm seat (4) is provided at the other end of the support arm mechanism (2), a lower electrode cap (5) is fixedly mounted on the top surface of the lower static arm seat (4), a support plate (6) is fixedly connected to the top surface of the lower static arm seat (4), a plurality of support columns (7) are fixedly connected to the top surface of the support plate (6), a rubber insulating pad (8) is fixedly connected to the top of the plurality of support columns (7), a through hole (9) is provided in the middle of the support plate (6), and the lower electrode cap (5) passes through the inner cavity of the through hole (9) and extends to the top of the support plate (6).

2. A mobile resistance welding device according to claim 1, characterized in that: The support arm mechanism (2) comprises a U-shaped frame (10) fixedly connected to the end of the mechanical arm (1), the two ends of the U-shaped frame (10) are respectively provided with telescopic grooves (11), a transmission groove (12) is arranged between the two telescopic grooves (11), the inner sides of the two telescopic grooves (11) are respectively rotatably connected with screw rods (13), the outer sides of the two screw rods (13) are respectively threadedly sleeved with a moving frame (14), one end of one of the moving frames (14) extends to the outside of the U-shaped frame (10) and is fixedly connected to the lower static arm seat (4), the outer sides of the two screw rods (13) are respectively fixedly sleeved with synchronous wheels (16), the two synchronous wheels (16) are transmission-connected with a synchronous belt (17), and the synchronous belt (17) passes through the inner cavity of the transmission groove (12), and a servo motor (15) is fixedly installed at the end of the U-shaped frame (10), and the output shaft of the servo motor (15) is connected to one end of a screw rod (13).

3. A mobile resistance welding device according to claim 2, characterized in that: The upper welding mechanism (3) comprises an upper boom seat (18) fixedly connected to the end of another movable frame (14), a hydraulic cylinder (19) fixedly mounted on the upper boom seat (18), an output end of the hydraulic cylinder (19) extending to the bottom of the upper boom seat (18) and fixedly connected to a mounting seat (20), an upper electrode sleeve (21) fixedly connected to the bottom surface of the mounting seat (20), and a screw (22) being provided at the bottom end of the upper electrode sleeve (21).

4. A mobile resistance welding device according to claim 2, characterized in that: The side surface of the movable frame (14) is in contact with the inner wall of the telescopic slot (11).

5. The mobile resistance welding device according to claim 3, characterized in that: The lower electrode cap (5) and the upper electrode sleeve (21) are arranged concentrically.

6. The mobile resistance welding device according to claim 1, characterized in that: The top surface of the lower electrode cap (5) is flush with the top surface of the rubber insulating pad (8).

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