Detachable welding head structure of spot welding machine

Abstract

The detachable welding head structure of the spot welding machine comprises a base, a welding head body and a sleeve, the sleeve comprises a fixed pipe and a movable pipe which are coaxially arranged, the movable pipe is of an interlayer type structure, the fixed pipe can be inserted into a cavity of the movable pipe to move front and back relative to the fixed pipe in the axial direction, and an elastic piece is arranged between the movable pipe and the fixed pipe. The welding head body and the sleeve are detachably connected with the base, so that quick disassembly is realized, the time for replacing the abraded welding head is shortened, and the production efficiency is improved. When the welding head body does not make contact with a workpiece, the movable pipe completely wraps the welding head body so that the welding head body can not rub with the workpiece at the high temperature due to misoperation and the like, abrasion of the welding head body is reduced, when welding is needed, due to the fact that the movable pipe is elastically connected and can move towards one side of the fixed pipe, welding machining is not affected, and welding efficiency is improved. And the welding head body can be sleeved with the device, interference of external impurities is avoided, and the welding quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment technology, and in particular to a detachable welding head structure for a spot welding machine. Background Technology

[0002] A spot welding machine is a mechanical device that uses the principle of double-sided, double-point overcurrent welding. During operation, two electrodes press against the workpiece, creating a certain contact resistance between the two metal layers. As the welding current flows from one electrode to the other, an instantaneous thermal fusion occurs at the contact resistance point. The welding current also flows instantaneously from the other electrode back to the first electrode along the two workpieces, forming a circuit without damaging the internal structure of the workpiece. The spot welding process involves: turning on cooling water; cleaning the workpiece surface, assembling it accurately, and then placing it between the upper and lower electrodes, applying pressure to ensure good contact; applying current to heat the contact surfaces of the two workpieces, causing localized melting and forming a weld nugget; after power is cut off, pressure is maintained, allowing the weld nugget to cool and solidify under pressure to form a weld spot; finally, the pressure is removed, and the workpiece is taken out. Spot welding process parameters such as welding current, electrode pressure, energizing time, and electrode working surface dimensions have a significant impact on welding quality. The spot welding machine utilizes the high-temperature arc generated when the positive and negative electrodes are momentarily short-circuited to melt the materials between the electrodes, achieving the purpose of bonding them.

[0003] Current spot welding machines have certain inconveniences in use, one of which is the wear of the welding head. While the welding head naturally wears down during welding, insufficient welding force or unstable operation can cause friction between the welding head and the workpiece, accelerating wear. Additionally, insufficient welding head hardness or a rough workpiece surface also increases wear. These factors lead to faster welding head wear and frequent replacements, reducing work efficiency and increasing production costs. Furthermore, existing welding heads typically use threaded connections, making disassembly cumbersome and further reducing replacement efficiency. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a detachable welding head structure for spot welding machines, which solves the problem that welding heads are prone to wear, resulting in reduced production efficiency and increased production costs.

[0005] According to an embodiment of the present utility model, a detachable welding head structure for a spot welding machine includes a base, a welding head body, and a sleeve. The welding head body is detachably connected to the base, and the sleeve is a tubular structure and is coaxially sleeved on the outside of the welding head body. The sleeve is also detachably connected to the base.

[0006] The sleeve includes a fixed tube and a movable tube arranged coaxially. One end of the fixed tube is connected to the base, and the other end is elastically connected to the movable tube. The movable tube has a sandwich structure with an inner tube wall and an outer tube wall. A cavity is formed between the inner tube wall and the outer tube wall. The cavity is open at one end corresponding to the fixed tube and closed at the other end. The thickness of the cavity is greater than the thickness of the fixed tube wall, so that the fixed tube can be inserted into the cavity. The movable tube can move back and forth relative to the fixed tube along the axial direction through the cavity. An elastic element is provided between the inner end face of the movable tube cavity and the end of the fixed tube.

[0007] Furthermore, the elastic element is a spring, which surrounds the inner wall of the movable tube and is disposed inside the cavity, with its two ends fixedly connected to the inner end face of the movable tube cavity and the end of the fixed tube, respectively.

[0008] Furthermore, the elastic element is a plurality of springs, which are evenly arranged around the inner wall of the movable tube, and the two ends of the springs are fixedly connected to the inner end face of the cavity of the movable tube and the end of the fixed tube, respectively.

[0009] Furthermore, when the spring is in equilibrium, the top part of the fixed tube extends into the cavity of the movable tube, while the end of the movable tube away from the fixed tube completely accommodates the welding head body.

[0010] Furthermore, a number of contact heads are provided on the end face of the movable tube away from the fixed tube. The contact heads are evenly arranged around the periphery and have an outwardly convex arc surface structure.

[0011] Furthermore, the bottom of the fixed tube is provided with a limiting part coaxially installed inside. The limiting part is a ring structure, and the radial cross-sectional shape of its inner ring surface is an arc-shaped rectangle, that is, the rectangle protrudes outward in an arc shape on both sides.

[0012] Furthermore, the welding head body is provided with a connecting part at one end of the fixed tube. The shape of the connecting part matches the shape of the inner ring surface of the limiting part, so that the welding head body can pass through the limiting part and be limited by the shape of the inner ring surface, so that the welding head body cannot rotate axially relative to the fixed tube.

[0013] Furthermore, the base is provided with a slot, the slot corresponding to the shape of the connecting part, so that the connecting part can be inserted into it for positioning, the connecting part is provided with a radially penetrating connecting hole, and the slot is provided with two opposite through holes corresponding to the connecting hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The spot welding head structure of this utility model includes a base, a welding head body, and a sleeve. Both the welding head body and the sleeve are detachably connected to the base, enabling quick disassembly, reducing the time required to replace worn welding heads, and improving production efficiency. Simultaneously, the sleeve in this utility model has a fixed tube and a movable tube that are elastically connected to each other. When the welding head body is not in contact with the workpiece, the movable tube completely covers the welding head body, preventing the welding end from rubbing against the workpiece at high temperatures due to misoperation, thus reducing wear on the welding head body. When welding is required, due to the elastic connection of the movable tube, it can move towards the fixed tube side without affecting the welding process. It can also be sleeved outside the welding head body to avoid interference from external impurities and improve welding quality. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the axial cross-section of an embodiment of the present invention.

[0018] Figure 3 This is a top view of the fixing tube in an embodiment of this utility model.

[0019] In the above figures: 1. Base; 2. Welding head body; 3. Fixed tube; 4. Movable tube; 5. Spring; 6. Screw; 7. Nut; 8. Contact head; 11. Slot; 21. Connecting part; 31. Limiting part; 41. Cavity.

[0020] 1. Base, 2. Welding head body, 3. Fixed tube, 4. Movable tube, 5. Spring, 6. Screw, 7. Nut, 8. Contact head, 11. Slot, 21. Connecting part, 31. Limiting part, 41. Cavity. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown in the figure, this utility model embodiment proposes a detachable welding head structure for a spot welding machine, including a base 1, a welding head body 2, and a sleeve. The welding head body 2 is detachably connected to the base 1, and the sleeve is a tubular structure and is coaxially sleeved on the outside of the welding head body 2. At the same time, the sleeve is also detachably connected to the base 1.

[0023] like Figure 2As shown, in the specific scheme, the sleeve includes a fixed tube 3 and a movable tube 4 arranged coaxially. One end of the fixed tube 3 is connected to the base 1, and the other end is elastically connected to the movable tube 4. The movable tube 4 has a sandwich structure with an inner tube wall and an outer tube wall. A cavity 41 is formed between the inner tube wall and the outer tube wall. The cavity 41 is open at one end corresponding to the fixed tube 3 and closed at the other end. The thickness of the cavity 41 is greater than the thickness of the tube wall of the fixed tube 3, so that the fixed tube 3 can be inserted into the cavity 41. The movable tube 4 can move back and forth axially relative to the fixed tube 3 through the cavity 41. An elastic element is provided between the inner end face of the cavity 41 of the movable tube 4 and the end of the fixed tube 3.

[0024] Preferably, the elastic element is a spring 5, which surrounds the inner wall of the movable tube 4 and is disposed inside the cavity 41. Both ends of the spring 5 are fixedly connected to the inner end face of the cavity 41 of the movable tube 4 and the end of the fixed tube 3, respectively. Alternatively, multiple springs 5 ​​can be used simultaneously, evenly arranged around the inner wall of the movable tube 4, with both ends of the spring 5 fixedly connected to the inner end face of the cavity 41 of the movable tube 4 and the end of the fixed tube 3, respectively. When the spring 5 is in equilibrium, the top portion of the fixed tube 3 extends into the cavity 41 of the movable tube 4, while the end of the movable tube 4 away from the fixed tube 3 completely accommodates the welding head body 2. Thus, when welding is not in progress or after welding is completed, the movable tube 4 can extend to protect the welding head body 2, preventing it from rubbing against the workpiece at high temperatures due to misoperation or other reasons, thereby reducing wear on the welding head body 2.

[0025] Furthermore, in this embodiment, a plurality of contact heads 8 are provided on the end face of the movable tube 4 away from the fixed tube 3. The contact heads 8 are evenly arranged around the periphery, and the contact heads 8 are outwardly convex arc-shaped structures. The contact heads 8 can reduce the contact area between the movable tube 4 and the workpiece, and avoid the friction between the workpiece and the end face of the movable tube 4 from affecting the flatness of its welding surface.

[0026] like Figure 3 As shown in this embodiment, the bottom of the fixed tube 3 is provided with a limiting part 31 coaxially installed inside. The limiting part 31 is an annular structure, and the radial cross-sectional shape of its inner annular surface is an arc-shaped rectangle, that is, the rectangle protrudes outward in an arc shape on both sides. Correspondingly, the welding head body 2 is provided with a connecting part 21 at one end of the fixed tube 3. The shape of the connecting part 21 matches the shape of the inner annular surface of the limiting part 31, so that the welding head body 2 can pass through the limiting part 31 and is limited by the shape of the inner annular surface, so that the welding head body 2 cannot rotate axially relative to the fixed tube 3.

[0027] Furthermore, the base 1 is provided with a slot 11, the slot 11 corresponds to the shape of the connecting part 21, so that the connecting part 21 is inserted into it for positioning, the connecting part 21 is provided with a radially penetrating connecting hole, and the slot 11 is provided with two opposite through holes corresponding to the connecting hole.

[0028] In use, insert the welding head body 2 from the top of the sleeve, so that the bottom of the welding head body 2 passes through the connecting part 21. Then, insert the welding head body 2 and the sleeve into the slot 11 simultaneously. The bottom of the fixing tube 3 is clamped between the welding head body 2 and the slot 11, forming an integral fixation. Then, pass the screw 6 through the connecting hole and the through hole, and fix it with the nut 7, thus completing the installation of the welding head. To disassemble, remove the screw 6 and pull out the welding head body 2 and the sleeve in the opposite direction.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A detachable welding head structure for a spot welding machine, characterized in that: It includes a base, a welding head body, and a sleeve. The welding head body is detachably connected to the base. The sleeve is a tubular structure and is coaxially sleeved on the outside of the welding head body. The sleeve is also detachably connected to the base. The sleeve includes a fixed tube and a movable tube arranged coaxially. One end of the fixed tube is connected to the base, and the other end is elastically connected to the movable tube. The movable tube has a sandwich structure with an inner tube wall and an outer tube wall. A cavity is formed between the inner tube wall and the outer tube wall. The cavity is open at one end corresponding to the fixed tube and closed at the other end. The thickness of the cavity is greater than the thickness of the fixed tube wall, so that the fixed tube can be inserted into the cavity. The movable tube can move back and forth relative to the fixed tube along the axial direction through the cavity. An elastic element is provided between the inner end face of the movable tube cavity and the end of the fixed tube.

2. The detachable welding head structure for a spot welding machine as described in claim 1, characterized in that: The elastic element is a spring, which surrounds the inner wall of the movable tube and is disposed inside the cavity. Its two ends are fixedly connected to the inner end face of the movable tube cavity and the end of the fixed tube, respectively.

3. The detachable welding head structure for a spot welding machine as described in claim 1, characterized in that: The elastic element consists of several springs, which are evenly arranged around the inner wall of the movable tube. The two ends of the springs are fixedly connected to the inner end face of the cavity of the movable tube and the end of the fixed tube, respectively.

4. A detachable welding head structure for a spot welding machine as described in claim 2 or 3, characterized in that: When the spring is in equilibrium, the top part of the fixed tube extends into the cavity of the movable tube, while the end of the movable tube away from the fixed tube completely accommodates the welding head body.

5. The detachable welding head structure for a spot welding machine as described in claim 1, characterized in that: The end face of the movable tube away from the fixed tube is also provided with several contact heads. The contact heads are evenly arranged around the periphery and have an outwardly convex arc surface structure.

6. The detachable welding head structure for a spot welding machine as described in claim 1, characterized in that: The bottom of the fixed tube is provided with a limiting part coaxially installed inside. The limiting part is a ring structure, and the radial cross-section of its inner ring surface is an arc-shaped rectangle, that is, the rectangle protrudes outward in an arc shape on both sides.

7. The detachable welding head structure for a spot welding machine as described in claim 6, characterized in that: The welding head body is provided with a connecting part at one end of the fixed pipe. The shape of the connecting part matches the shape of the inner ring surface of the limiting part, so that the welding head body can pass through the limiting part and be limited by the shape of the inner ring surface, so that the welding head body cannot rotate axially relative to the fixed pipe.

8. The detachable welding head structure for a spot welding machine as described in claim 7, characterized in that: The base is provided with a slot, which corresponds to the shape of the connecting part so that the connecting part can be inserted into it for positioning. The connecting part is provided with a radially penetrating connecting hole, and the slot is provided with two opposite through holes corresponding to the connecting hole.

Images