Switchable spot welding head structure

Abstract

The utility model discloses a kind of switchable spot welding head structures, including mutually connected upper support arm and first lower support arm, the bottom of upper upper support arm is equipped with upper spot welding head guide pipe, the bottom of upper spot welding head guide pipe is equipped with first rotating mechanism, first rotating mechanism and the bottom plane of upper spot welding head guide pipe are arranged obliquely, the bottom of first rotating mechanism is equipped with upper electrode device, and upper electrode device includes at least two obliquely arranged upper electrode parts, the bottom of lower support arm is equipped with lower spot welding head guide pipe, the top of lower spot welding head guide pipe is equipped with second rotating mechanism, second rotating mechanism and the top plane of lower spot welding head guide pipe are arranged obliquely, the top of second rotating mechanism is equipped with first lower electrode device, and first lower electrode device includes at least two obliquely arranged first lower electrode parts. The present application can switch different electrodes by rotating mechanism, reducing the time of replacing electrode.

Description

Technical Field

[0001] This utility model belongs to the field of spot welding head technology, specifically relating to a switchable spot welding head structure. Background Technology

[0002] Spot welding is a common joining process in industrial manufacturing, widely used in automobile manufacturing, home appliance assembly, sheet metal processing, and other fields. Traditional spot welding equipment usually uses a fixed welding torch with the welding electrode fixed to the ends of the upper and lower support arms, which cannot achieve rapid electrode replacement or adapt to various welding requirements.

[0003] Existing spot welding equipment often requires manual nozzle replacement when dealing with base materials of varying thicknesses, shapes, or sizes. This process is cumbersome, and frequent electrode changes can lead to equipment downtime and reduced production efficiency. Furthermore, in automated welding production lines, welding conditions are highly variable, and electrodes with a single structure are insufficient to meet the demands of rapid switching and precise positioning required for efficient welding.

[0004] Therefore, there is an urgent need for a compact spot welding head structure that can quickly switch between multiple electrodes to improve the adaptability and automation level of welding equipment, and effectively improve welding efficiency and welding quality. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a switchable spot welding head structure, comprising an upper support arm and a first lower support arm connected to each other. The upper support arm and the first lower support arm together form a C-shaped structure. An upper spot welding head guide tube is provided at the bottom of the upper support arm, and a first rotating mechanism is rotatably provided at the bottom of the upper spot welding head guide tube. The first rotating mechanism is inclined to the bottom plane of the upper spot welding head guide tube, and an upper electrode device is provided at the bottom of the first rotating mechanism. The upper electrode device includes at least two inclined upper electrode portions. A lower spot welding head guide tube is provided at the bottom of the lower support arm, and a second rotating mechanism is rotatably provided above the lower spot welding head guide tube. The second rotating mechanism is inclined to the upper plane of the lower spot welding head guide tube, and a first lower electrode device is provided above the second rotating mechanism. The first lower electrode device includes at least two inclined first lower electrode portions.

[0006] Preferably, the upper electrode device includes a first upper electrode portion, a second upper electrode portion, and a third upper electrode portion, and the first lower electrode device includes a first lower electrode portion, a second lower electrode portion, and a third lower electrode portion. The tip diameter of the first upper electrode portion is the same as the tip diameter of the first lower electrode portion, the tip diameter of the second upper electrode portion is the same as the tip diameter of the second lower electrode portion, and the tip diameter of the third upper electrode portion is the same as the tip diameter of the third lower electrode portion.

[0007] Preferably, the first rotating mechanism includes a rotating disk and a limiting disk, with a connecting disk between the rotating disk and the limiting disk. An annular groove is formed on the outer side of the connecting disk, and a retaining ring is formed by the bottom of the upper spot welding head guide tube protruding inward. The retaining ring is engaged in the annular groove. A plurality of spherical grooves are provided on the inner side wall of the annular groove. A positioning ball screw is provided on the side of the connecting disk, and the ball part of the positioning ball screw is engaged in the corresponding spherical groove. The structure of the second rotating mechanism is the same as that of the first rotating mechanism.

[0008] Preferably, it also includes a second lower support arm. The top of the upper support arm is provided with a connecting frame, and the bottom two sides of the connecting frame are provided with hinge plates. The hinge plates on both sides are respectively hinged to the first lower support arm and the second lower support arm. The upper two sides of the connecting frame are respectively hinged to a first telescopic cylinder and a second telescopic cylinder. The first telescopic cylinder is hinged to the first lower support arm, and the second telescopic cylinder is hinged to the second lower support arm.

[0009] Preferably, the upper electrode device is detachably connected to the rotating disk.

[0010] The advantages of this utility model are:

[0011] 1. This solution enables rapid selection and replacement of electrode types through multi-point setting and rotation switching of upper and lower electrodes, improving the adaptability of spot welding equipment to different working conditions and reducing electrode replacement time; the tilted multi-electrode structure can effectively avoid interference between non-working electrodes and welding components, and the structure is compact and flexible in operation.

[0012] 2. This solution, through the use of a rotating disk, a limiting disk, and a connecting disk, along with a positioning ball screw and a retaining ring and groove structure, enables precise switching and stable locking of the electrode head between multiple working positions. The positioning ball structure provides clear positioning feedback and anti-vibration stability, effectively preventing displacement or loosening of rotating parts during welding, thus improving welding consistency and equipment operational reliability.

[0013] 3. This solution uses a first and a second lower support arm, driven by dual telescopic cylinders to rotate to the working position, allowing the two lower electrode devices to be used alternately or redundantly. In case of damage, failure, or maintenance of the first lower support arm, the system can quickly switch to the second lower support arm to continue operation, improving the stability, continuity, and fault tolerance of the spot welding system. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present utility model.

[0015] Figure 2 This is a structural diagram of the spot welding state of this utility model.

[0016] Figure 3This is a schematic diagram of the structure of the present utility model with a spot welding frame.

[0017] Figure 4 This is a cross-sectional view of the bottom of the guide tube for the upper spot welding head of this utility model.

[0018] Figure 5 This is a structural diagram of the first rotating mechanism of this utility model.

[0019] Figure 6 This is a diagram of the first working state of Embodiment 2 of this utility model.

[0020] Figure 7 This is a diagram showing the second working state of Embodiment 2 of this utility model.

[0021] In the diagram: 1 Upper support arm, 2 First lower support arm, 3 Upper spot welding head guide tube, 4 Lower spot welding head guide tube, 5 First upper electrode part, 6 Second upper electrode part, 7 Third upper electrode part, 8 First lower electrode part, 9 Second lower electrode part, 10 Third lower electrode part, 11 Rotary disk, 12 Limiting disk, 13 Connecting disk, 14 Annular groove, 15 Snap ring, 16 Spherical groove, 17 Positioning ball screw, 18 Second lower support arm, 19 Connecting frame, 20 Hinge plate, 21 First telescopic cylinder, 22 Second telescopic cylinder, 23 Spot welding machine frame. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. 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 an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example 1, such as Figure 1-3 As shown, a switchable spot welding head structure includes an upper support arm 1 and a first lower support arm 2 connected to each other. The upper support arm 1 and the first lower support arm 2 form a C-shape to ensure uniform electrode pressure during welding. Both support arm 1 and the first lower support arm 2 are connected to an upper connecting frame 19, and the upper part of the connecting frame 19 is connected to a corresponding spot welding machine frame 23. A cylinder is installed inside the connecting frame 19 to drive the upper support arm 1 to move up and down.

[0026] The bottom of the upper support arm 1 is provided with an upper spot welding head guide tube 3. The bottom of the upper spot welding head guide tube 3 is provided with a first rotating mechanism. The first rotating mechanism is inclined to the bottom plane of the upper spot welding head guide tube 3. The bottom of the first rotating mechanism is provided with an upper electrode device. The upper electrode device includes an inclined first upper electrode part 5, a second upper electrode part 6 and a third upper electrode part 7. The tip diameters of the three electrode parts are different, namely 4mm, 6mm and 8mm.

[0027] Combination Figure 2The lower support arm has a lower spot welding head guide tube 4 at its bottom. A second rotating mechanism is rotatably mounted above the lower spot welding head guide tube 4, and the second rotating mechanism is inclined to the upper plane of the lower spot welding head guide tube 4. A first lower electrode device is located above the second rotating mechanism. The first lower electrode device includes a first lower electrode part 8, a second lower electrode part 9, and a third lower electrode part 10. The tip diameter of the first upper electrode part 5 is the same as the tip diameter of the first lower electrode part 8, the tip diameter of the second upper electrode part 6 is the same as the tip diameter of the second lower electrode part 9, and the tip diameter of the third upper electrode part 7 is the same as the tip diameter of the third lower electrode part 10. When welding plates of different thicknesses, electrode parts of different diameters are required to match the pressure and current. Before welding, a suitable electrode can be quickly selected according to the thickness, shape, and weld size of the base material. During use, simply rotate an electrode part of the same diameter to the working position to complete the electrode selection. This method is highly adaptable and avoids frequent manual replacement of the welding nozzle. Multiple electrodes are tilted on the rotating mechanism, rather than all facing the welding point, so that unused electrodes are in a clearing position and do not interfere with the current welding operation. The electrodes can be arranged more compactly, saving space, reducing the size of the spot weld head, and making it easier to adapt to welding in confined spaces or complex positions.

[0028] Combination Figure 4-5The first rotating mechanism includes a rotating disk 11 and a limiting disk 12. A connecting disk 13 is provided between the rotating disk 11 and the limiting disk 12. An annular groove 14 is formed on the outer side of the connecting disk 13. A retaining ring 15 is formed by the inward protrusion of the bottom of the upper spot welding head guide tube 3. The retaining ring 15 is engaged in the annular groove 14. Several spherical grooves 16 are provided on the inner side wall of the annular groove 14. A positioning ball screw 17 is provided on the side of the connecting disk 13. The ball part of the positioning ball screw 17 is engaged in the corresponding spherical groove 16. The positioning ball screw 17 is a screw with a ball at the front end. It usually integrates a spring mechanism inside, so that the steel ball has a certain extension force in the axial direction. When the rotating disk 11 is rotated, the ball part of the positioning ball screw 17 will pass through and engage in the next spherical groove 16 in sequence. When the rotating disk 11 rotates to the designated position, the ball portion of the positioning ball screw 17 engages in the corresponding shaped groove, locking the rotating disk 11 in that position. Due to the elasticity of the positioning ball screw 17, a certain amount of external force is required to pull it out of the spherical groove 16, thereby ensuring the stability of the support plate rotating disk 11 in the locked state. The rotating disk 11 can be rotated manually using tools, or a small motor can be installed in the upper spot welding head guide tube 3 to control the rotation of the rotating disk 11. The structure of the second rotating mechanism is the same as that of the first rotating mechanism, and will not be described again in this embodiment. A conductive contact, such as a rotating copper ring, is provided at the rear of the rotating disk 11, passing through the connecting disk 13 and the limiting disk 12. A rotating conductive mechanism, such as a carbon brush or slip ring assembly, is provided between the limiting disk 12 and the upper spot welding head guide tube 3. Power can be supplied to the rotating copper ring through the carbon brush or slip ring assembly. The rotating copper ring is connected to the electrode part through internal wires to supply power to the electrode part, without affecting electrode switching and rotation angle adjustment.

[0029] Example 2, combined with Figure 6-7This embodiment also includes a second lower support arm 18. A connecting frame 19 is provided at the top of the upper support arm 1, and hinge plates 20 are provided on both sides of the bottom of the connecting frame 19. The hinge plates 20 are respectively hinged to the first lower support arm 2 and the second lower support arm 18. A first telescopic cylinder 21 and a second telescopic cylinder 22 are respectively hinged to the upper sides of the connecting frame 19. The first telescopic cylinder 21 is hinged to the first lower support arm 2, and the second telescopic cylinder 22 is hinged to the second lower support arm 18. The structure of the second lower support arm 18 is symmetrical to that of the first lower support arm 2, and it also has the same lower electrode device. After the first lower support arm 2 is driven to rotate to the designated position by the first telescopic cylinder 21, the lower electrode device on the first lower support arm 2 performs the welding operation. If damage occurs, the first lower support arm 2 can be driven to rotate by the first telescopic cylinder 21, and the second lower support arm 18 can be driven to rotate to the working position by the second telescopic cylinder 22. By setting up a first lower support arm 2 and a second lower support arm 18, and using dual telescopic cylinders to drive them to the working position respectively, the two sets of lower electrode devices can be used alternately or redundantly. When the first lower support arm 2 is damaged, fails, or requires maintenance, the system can quickly switch to the second lower support arm 18 to continue working, improving the stability, continuity, and fault tolerance of the spot welding system.

[0030] In this embodiment, the first upper electrode portion 5, the second upper electrode portion 6, and the third upper electrode portion 7 are threadedly connected to the rotating disk 11, which can effectively improve the electrode replacement efficiency and ensure the stability of electrode positioning and welding quality during the welding process. The threaded holes on the surface of the rotating disk 11 used for connecting the electrodes are made of conductive metal material to ensure reliable conduction with the power supply system; while the remaining parts of the rotating disk 11 are covered with insulating material or have a nested structure to effectively prevent current conduction to non-working areas and ensure electrical safety during equipment operation.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A switchable spot welding head structure, characterized in that: The device includes an upper support arm (1) and a first lower support arm (2) connected to each other. The upper support arm (1) and the first lower support arm (2) are C-shaped. The bottom of the upper support arm (1) is provided with an upper spot welding head guide tube (3). The bottom of the upper spot welding head guide tube (3) is rotatably provided with a first rotating mechanism. The first rotating mechanism is inclined to the bottom plane of the upper spot welding head guide tube (3). The bottom of the first rotating mechanism is provided with an upper electrode device. The upper electrode device includes at least two inclined upper electrode parts. The bottom of the lower support arm is provided with a lower spot welding head guide tube (4). The upper part of the lower spot welding head guide tube (4) is rotatably provided with a second rotating mechanism. The second rotating mechanism is inclined to the upper plane of the lower spot welding head guide tube (4). The upper part of the second rotating mechanism is provided with a first lower electrode device. The first lower electrode device includes at least two inclined first lower electrode parts (8).

2. The switchable spot welding head structure according to claim 1, characterized in that: The upper electrode device includes a first upper electrode part (5), a second upper electrode part (6) and a third upper electrode part (7), and the first lower electrode device includes a first lower electrode part (8), a second lower electrode part (9) and a third lower electrode part (10). The tip diameter of the first upper electrode part (5) is the same as the tip diameter of the first lower electrode part (8), the tip diameter of the second upper electrode part (6) is the same as the tip diameter of the second lower electrode part (9), and the tip diameter of the third upper electrode part (7) is the same as the tip diameter of the third lower electrode part (10).

3. The switchable spot welding head structure according to claim 2, characterized in that: The first rotating mechanism includes a rotating disk (11) and a limiting disk (12). A connecting disk (13) is provided between the rotating disk (11) and the limiting disk (12). An annular groove (14) is formed on the outer side of the connecting disk (13). A retaining ring (15) is formed by protruding inward from the bottom of the upper spot welding head guide tube (3). The retaining ring (15) is inserted into the annular groove (14). Several spherical grooves (16) are provided on the inner side wall of the annular groove (14). A positioning ball screw (17) is provided on the side of the connecting disk (13). The ball part of the positioning ball screw (17) is inserted into the corresponding spherical groove (16). The structure of the second rotating mechanism is the same as that of the first rotating mechanism.

4. The switchable spot welding head structure according to claim 3, characterized in that: It also includes a second lower support arm (18). The top of the upper support arm (1) is provided with a connecting frame (19). The bottom sides of the connecting frame (19) are provided with hinge plates (20). The hinge plates (20) on both sides are respectively hinged to the first lower support arm (2) and the second lower support arm (18). The upper sides of the connecting frame (19) are respectively hinged to a first telescopic cylinder (21) and a second telescopic cylinder (22). The first telescopic cylinder (21) is hinged to the first lower support arm (2), and the second telescopic cylinder (22) is hinged to the second lower support arm (18).

5. The switchable spot welding head structure according to claim 4, characterized in that: The upper electrode device is detachably connected to the rotating disk (11).

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