A spot welding head structure for evaporator welding and a resistance spot welding machine

Abstract

This utility model relates to the field of resistance spot welding technology, and discloses a spot welding head structure and a resistance spot welding machine for evaporator welding. The spot welding head structure includes a support arm and an electrode rod disposed on the support arm. The support arm includes an elastic clamp that can bend and undergo elastic deformation. By following the dynamic elastic deformation of the welding with the elastic clamp of the support arm, the dynamic stability of the electrode pressure of the electrode rod during the workpiece welding process can be ensured, thereby improving the weld yield and welding stability, extending the service life of the electrode, and the structure is simple, which can reduce production and maintenance costs. The resistance spot welding machine adopts the aforementioned spot welding head structure, including a welding mechanism. The welding mechanism can be arranged on one side to facilitate the wiring of the spot welding machine and reduce the difficulty of equipment assembly and debugging. At the same time, it can also be arranged on both sides to form a butt welding structure, which can complete the double-sided welding of the workpiece in one action, significantly improving the working efficiency of the spot welding machine.

Description

Technical Field

[0001] This utility model relates to the field of resistance spot welding technology, specifically to a spot welding head structure and a resistance spot welding machine for evaporator welding. Background Technology

[0002] The evaporator is a heat exchange component in the fully enclosed refrigeration system of household refrigerators, commercial freezers, refrigerated display cases, and other equipment. It mainly consists of a heat exchange coil formed by bending Bundy tubes (double-layer welded steel pipes) and multiple equidistant heat dissipation wires vertically welded to the outer walls of both sides of the coil (e.g., ...). Figure 6 (As shown). Evaporators are mostly welded using resistance spot welding, which involves using the spot welding head of a resistance spot welding machine to press against the heat dissipation wire and Bundy tube to be welded, applying a low voltage and a high current, and using the Joule heat generated by the contact resistance to instantly heat the contact area between the heat dissipation wire and the Bundy tube to a molten state. After cooling with electrode pressure, a weld nugget is formed.

[0003] Since both the heat sink wire and the Bondi tube have circular cross-sections, and the Bondi tube has a thin-walled tube structure, the welding process involves point contact between cylindrical surfaces, resulting in a very small initial contact area. To prevent the Bondi tube from burning through and the heat sink wire from melting, the industry generally adopts a high-current, short-current welding process. The welding current-on time is usually controlled in the millisecond range, which places extremely high demands on the stability of electrode pressure and displacement tracking during the welding process.

[0004] In the existing technology, the resistance spot welding equipment used for evaporator welding uses a cylinder drive structure for the pressure drive of the spot welding head. That is, the piston rod of the cylinder drives the spot welding head to make linear reciprocating motion to achieve pressure and reset of the workpiece. For the welding needs of dense weld points in evaporators, the industry mostly uses multi-head spot welding machines, which integrate multiple sets of spot welding heads and achieve synchronous welding of multiple weld points through single or multiple sets of cylinders.

[0005] However, existing cylinder-driven systems suffer from severe response lag, failing to adapt to the dynamic deformation during the welding process and easily leading to burn-through of the Bonded tube and incomplete weld joints. During the discharge process of resistance spot welding, the metal in the contact area between the heat sink and the Bonded tube undergoes a full cycle of solid-state heating, melting and liquefaction, thermal expansion, and cooling solidification within milliseconds. This results in instantaneous reciprocating deformation of the axial dimension of the welding area; that is, during the melting stage, the thermal expansion of the metal produces axial elongation displacement, and during the cooling and solidification stage, the contraction of the weld nugget produces axial contraction displacement. This deformation process is extremely short. As the driving component, the cylinder, due to the compressibility of the gas itself, cannot keep up with the instantaneous axial deformation of the weld nugget during welding, thus failing to achieve synchronous reciprocating displacement compensation of the spot welding head.

[0006] When the weld nugget expands instantaneously due to thermal expansion, the cylinder cannot retract in time, causing a sudden surge in electrode pressure. This can easily crush the thin steel wire and expel molten metal, resulting in severe welding spatter. When the weld nugget cools and contracts rapidly, the cylinder cannot keep up with the pressure, causing a contact gap between the spot welding head and the workpiece. This sudden increase in contact resistance triggers a secondary discharge, which can directly burn through the thin-walled Bundy tube, or result in poor weld nugget formation, leading to incomplete or false welds. The weld joints have insufficient shear strength, and the heat dissipation wire is very likely to fall off during later use.

[0007] Therefore, there is an urgent need to propose a spot welding head structure and a resistance spot welding machine for evaporator welding to overcome the above-mentioned defects in the existing technology. Utility Model Content

[0008] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a spot welding head structure and resistance spot welding machine for evaporator welding. This solves the problems of slow response, inability to follow dynamic deformation during welding, easy burn-through of Bundy tubes and severe spatter in existing spot welding structures. It achieves dynamic stability of electrode pressure during evaporator welding, improves weld yield and welding stability, extends electrode life, and reduces production and maintenance costs.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] In the first aspect, a spot welding head structure for evaporator welding is proposed, including a support arm, an electrode rod for welding is provided on the support arm, the support arm includes a base, an elastic clamp is installed on the base, the electrode rod is connected to the elastic clamp, the base, the electrode rod and the elastic clamp move synchronously, and the electrode rod can drive the elastic clamp to bend and undergo elastic deformation relative to the base when subjected to axial force.

[0011] Optionally, the support arm has two elastic clamps spaced apart along the axial direction of the electrode rod. One end of each elastic clamp is connected by a top block, and the other end is connected by the base. The electrode rod is connected to the top block.

[0012] Optionally, a limiting block is fixedly installed on the base. The limiting block is located inside the two elastic clamps, and the side of the limiting block near the working end of the electrode rod is spaced apart from the elastic clamps, while the other side is in contact with the elastic clamps.

[0013] Optionally, the support arms are arranged in pairs, with the two support arms connected by a support plate. The two ends of the support plate are respectively connected to the two top blocks in the same group, and multiple electrode rods are installed on the support plate.

[0014] Optionally, the electrode rod is fixedly mounted on the support plate by a pressure plate, the electrode rod is located between the pressure plate and the support plate, and both the pressure plate and the support plate are provided with grooves that fit the outline of the electrode rod.

[0015] Optionally, two adjacent electrode rods are fixed to the support plate by the same pressure plate, and the electrode rods and the pressure plate are equidistantly distributed along the length of the support plate.

[0016] Secondly, a resistance spot welding machine for evaporator welding is proposed, which adopts the spot welding head structure for evaporator welding described in the first aspect. The resistance spot welding machine includes at least one welding mechanism, which includes a worktable. A slide plate for mounting the spot welding head structure is slidably arranged on the worktable. The electrode rod of the spot welding head structure is perpendicular to the length direction of the slide plate. The worktable is also provided with a drive component for driving the slide plate to reciprocate linearly along the axial direction of the electrode rod.

[0017] Optionally, two welding mechanisms are arranged opposite each other, and the slides of the two welding mechanisms can move synchronously relative to each other, with the workpiece to be welded passing between the two welding mechanisms.

[0018] Optionally, the drive assembly includes a rotating shaft, an eccentric wheel, and a transmission plate. The rotating shaft is rotatably mounted on the worktable, the eccentric wheel is fixedly mounted on the rotating shaft, one end of the transmission plate is movably sleeved on the eccentric wheel, and the other end is rotatably connected to the slide plate. The rotating shaft is perpendicular to the electrode rod, and the transmission plate is parallel to the electrode rod.

[0019] Optionally, each of the slide plates is driven independently by the corresponding drive component, and each slide plate is provided with at least one of the spot welding head structures, which are distributed along the length direction of the slide plate.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] (1) In this utility model, before welding, the end of the electrode rod is pressed against the part of the workpiece to be welded. At this time, the elastic clamp of the support arm is subjected to pressure and can bend and deform for the first time to offset the pressure on the workpiece. When the electrode rod discharges to weld, the instantaneous thermal expansion generated is transmitted to the elastic clamp through the electrode rod to make it bend and deform again, thereby driving the electrode rod to avoid synchronously and avoid damage such as burn-through to the workpiece. This structure can ensure the dynamic stability of the electrode pressure during the workpiece welding process by following the dynamic elastic deformation of the elastic clamp, thereby improving the weld yield and welding stability, extending the service life of the electrode, and the structure is simple, which can reduce production and maintenance costs.

[0022] (2) In this utility model, each support arm is provided with two elastic clamps, which can improve the stability of its elastic deformation during bending, ensure the consistency of multiple welding, and extend the service life of the support arm.

[0023] (3) In this utility model, the electrode rods are distributed on the support plate, and the support plate is supported by two support arms. This can realize the multi-point distribution of the electrode rods, meet the welding needs of dense weld points of the workpiece, improve welding efficiency, and ensure the dynamic stability of the electrode pressure during the welding process, so as to adapt to the welding work of different specifications of workpieces and improve compatibility.

[0024] (4) In this utility model, the welding mechanism of the resistance spot welding machine can be arranged on one side to facilitate the wiring of the spot welding machine and reduce the difficulty of equipment assembly and debugging. At the same time, it can also be arranged on both sides to form a butt welding structure. The double-sided welding of the workpiece can be completed in one action, which significantly improves the working efficiency of the spot welding machine.

[0025] (5) In this utility model, the slide plate drives the spot welding head structure to achieve reciprocating linear motion. The slide plate is driven by the rotating shaft driving the transmission plate through the eccentric wheel, and then the transmission plate drives the slide plate to make linear reciprocating motion. Its driving component adopts the action principle of the linkage mechanism, which has higher reliability and stability compared with the existing driving technology. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the spot welding head structure in an embodiment of this utility model;

[0027] Figure 2 This is a side view of the spot welding head structure in an embodiment of this utility model;

[0028] Figure 3 This is a schematic diagram of the structure in an embodiment of the present invention, showing the electrode rod fixed to the support plate by a pressure plate;

[0029] Figure 4 This is a schematic diagram of the resistance spot welding machine in an embodiment of this utility model;

[0030] Figure 5 This is a schematic diagram of the welding mechanism in an embodiment of this utility model;

[0031] Figure 6 This is a schematic diagram of the workpiece structure in the prior art;

[0032] Among them, 1. support arm; 101. base; 102. elastic clamp; 103. top block; 104. limiting block;

[0033] 2. Electrode rod; 3. Support plate; 4. Pressure plate; 5. Groove; 6. Worktable;

[0034] 7. Drive assembly; 701. Shaft; 702. Eccentric wheel; 703. Transmission plate;

[0035] 8. Slide plate; 9. Workpiece; 901. Heat exchange coil; 902. Heat dissipation wire. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0037] Example 1, as Figures 1-3 As shown, a spot welding head structure for evaporator welding includes a support arm 1, on which an electrode rod 2 for welding is provided. The support arm 1 can move synchronously with the electrode rod 2 to drive the electrode rod 2 to reciprocate linearly along the axial direction, thereby realizing spot welding of the workpiece 9. The workpiece 9 here is an existing evaporator, including a heat exchange coil 901 formed by bending a Bundy tube and multiple equidistant heat dissipation wires 902 vertically fixed to the outer walls on both sides of the heat exchange coil 901. The spot welding head structure realizes the welding of the heat dissipation wires 902 on the heat exchange coil 901.

[0038] As described above, the support arm 1 includes a base 101 and an elastic clamp 102. One end of the elastic clamp 102 is fixedly installed on the base 101, and the other end is fixedly connected to the electrode rod 2. Since the base 101, the electrode rod 2 and the elastic clamp 102 can move synchronously, when the electrode rod 2 is subjected to axial force, it can drive the elastic clamp 102 to bend relative to the base 101 and undergo elastic deformation.

[0039] Before welding, the end of the electrode rod 2 presses against the part of the workpiece 9 to be welded. At this time, the elastic clamp 102 of the support arm 1 is subjected to pressure and can bend and deform initially to offset the pressure on the workpiece 9. When the electrode rod 2 discharges for welding, the instantaneous thermal expansion generated is transmitted through the electrode rod 2 to the elastic clamp 102, causing it to bend and deform again, thereby driving the electrode rod 2 to move away synchronously and avoid damage such as burn-through to the workpiece 9. This spot welding head structure, through the elastic clamp 102 following the dynamic elastic deformation of welding, can ensure the dynamic stability of the electrode pressure of the electrode rod 2 during the welding process of the workpiece 9, improve the weld yield and welding stability, extend the service life of the electrode, and the structure is simple, which can reduce production and maintenance costs.

[0040] Among them, the elastic clamping plate 102 can preferably be made of copper plate, which has good elasticity, can meet the performance requirements of the elastic clamping plate 102, and has low cost, making it suitable for large-scale mass production.

[0041] In Example 2, in order to improve the stability of the support arm 1 during elastic deformation and ensure the consistency of multiple welding, this utility model also proposes to set two elastic clamping plates 102 on each support arm 1.

[0042] like Figures 1-3 As shown, two elastic clamping plates 102 are spaced apart along the axial direction of the electrode rod 2 on the support arm 1. One end of each elastic clamping plate 102 is connected by a top block 103, and the other end is connected by a base 101. At this time, the electrode rod 2 is fixedly connected to the top block 103. When the electrode rod 2 is subjected to axial force, the axial force can be transmitted to both elastic clamping plates 102 simultaneously through the top block 103, so that they can share the load, thereby extending the service life of the support arm 1 and improving the stability of the support arm 1 during elastic deformation under bending, thus ensuring the consistency of multiple welding operations.

[0043] Furthermore, a deformation area is formed between the two elastic clamping plates 102. A limiting block 104 is fixedly installed on the base 101. The limiting block 104 is located in the deformation area inside the two elastic clamping plates 102. The side of the limiting block 104 near the working end of the electrode rod 2 is spaced apart from the elastic clamping plate 102 that is also near the working end of the electrode rod 2. The other side is in contact with the elastic clamping plate 102 that is away from the working end of the electrode rod 2. That is, the two opposite sides of the limiting block 104 along the axial direction of the electrode rod 2 have a deformation gap between one side and the elastic clamping plate 102, and the other side is in contact with the corresponding elastic clamping plate 102.

[0044] Specifically, there is also an movable gap between the top of the limiting block 104 and the top block 103 to ensure that the elastic clamp 102 can deform smoothly. The limiting block 104 can limit the bending deformation range of the support arm 1, avoiding excessive deformation that would cause the electrode rod 2 to be delayed in resetting. That is, the deformation range of the elastic clamp 102 during welding is the aforementioned deformation gap. When the inner side of the elastic clamp 102 near the working end of the electrode rod 2 abuts against the limiting block 104, the limiting block 104 can prevent it from deforming further, ensuring that the bending elastic deformation of the support arm 1 is controllable. At the same time, when the support arm 1 is reset after welding, the side contact between the elastic clamp 102 and the limiting block 104 can also play a limiting role, ensuring the stable operation of the structure.

[0045] In Example 3, due to the dense weld points of the evaporator, multiple electrode rods 2 are usually required. If the elastic clamp 102 is designed to be too narrow, the number of electrode rods 2 can be limited. If the elastic clamp 102 is designed to be too wide, although it can meet the requirements for the number of electrode rods 2, it will affect the elastic deformation performance of the support arm 1. Therefore, the support arm 1 is designed to be used in pairs, with the two support arms 1 in the same pair being fixedly connected by the support plate 3, and the electrode rods 2 are arranged at equal intervals along the length of the support plate 3 (e.g., ...). Figure 1 and Figure 3 (As shown).

[0046] Specifically, the two ends of the support plate 3 are fixedly connected to the two top blocks 103 in the same group, and the electrode rods 2 are distributed on the support plate 3. The support plate 3 is supported by two support arms 1, which can realize the multi-point distribution of the electrode rods 2 to meet the welding requirements of the dense welding points of the workpiece 9 and improve the welding efficiency. It can also ensure the dynamic stability of the electrode pressure during the welding process to adapt to the welding work of workpieces 9 of different specifications and improve compatibility.

[0047] Furthermore, the electrode rod 2 is fixedly mounted on the support plate 3 by the pressure plate 4. The electrode rod 2 is located between the pressure plate 4 and the support plate 3. Both the pressure plate 4 and the support plate 3 have grooves 5 that are adapted to the outer contour of the electrode rod 2. That is, two adjacent electrode rods 2 are fixed to the support plate 3 by the same pressure plate 4, and the electrode rods 2 and the pressure plate 4 are equidistantly distributed along the length of the support plate 3 (e.g., Figure 1 and Figure 3 (As shown).

[0048] Specifically, electrode rod 2 is placed in groove 5 on support plate 3, and fastened by groove 5 on pressure plate 4. Pressure plate 4 is then fixed to support plate 3 with screws, thus achieving fixed installation of electrode rod 2 on support plate 3. This structure is easy to assemble and disassemble, and by adjusting the distance of the working end of electrode rod 2 protruding from support plate 3, the participation of the corresponding electrode rod 2 in welding work can be adjusted, which is convenient for adaptive adjustment according to the number of weld points in the same row on workpiece 9. At the same time, one pressure plate 4 fixes two electrode rods 2, which facilitates the disassembly and replacement of the corresponding electrode rod 2 as needed without affecting the installation accuracy of other electrode rods 2, significantly improving the maintenance and replacement efficiency of this welding head structure.

[0049] Working principle of spot welding head structure:

[0050] Before welding, the end of the support arm 1 and the electrode rod 2 press against the part of the workpiece 9 to be welded. At this time, the elastic clamp 102 of the support arm 1 is subjected to axial pressure and undergoes initial bending deformation to offset the pressure on the workpiece 9. Then, the electrode rod 2 discharges to weld the workpiece 9. The instantaneous thermal expansion generated during the discharge is also transmitted to the elastic clamp 102 through the electrode rod 2, causing it to bend and deform again, thereby driving the electrode rod 2 to move away synchronously and avoid damage such as burn-through to the workpiece 9. After welding is completed, the end of the electrode rod 2 of the support arm 1 is removed from the workpiece 9, and the elastic clamp 102 of the support arm 1 is reset, preparing for the next welding.

[0051] In Example 4, this utility model also proposes a resistance spot welding machine, which adopts the aforementioned spot welding head structure to meet the welding requirements for densely packed weld points in evaporators.

[0052] like Figure 4 and Figure 5As shown, a resistance spot welding machine for evaporator welding includes a welding mechanism. The welding mechanism includes a worktable 6, on which a slide plate 8 and a drive assembly 7 are provided. The slide plate 8 is used to support and install the spot welding head structure, and the drive assembly 7 is used to drive the slide plate 8 to reciprocate linearly along the axial direction of the electrode rod 2. By driving the spot welding head structure to reciprocate through the slide plate 8, the heat dissipation wire 902 is fixed on the heat exchange coil 901 by multi-point welding to complete the production of the evaporator.

[0053] The length direction of the slide plate 8 is perpendicular to the axis of the electrode rod 2 in the spot welding head structure, and the sliding direction of the slide plate 8 is parallel to the axis of the electrode rod 2. The two ends of the slide plate 8 are slidably mounted on the worktable 6 through the existing linear guide slider. Under the action of the drive component 7, the slide plate 8 drives the spot welding head structure to reciprocate to complete the spot welding operation.

[0054] As described above, the drive assembly 7 includes a rotating shaft 701, an eccentric wheel 702, and a transmission plate 703. The rotating shaft 701 is rotatably mounted on the worktable 6, and the eccentric wheel 702 is fixedly mounted on the rotating shaft 701. One end of the transmission plate 703 is movably sleeved on the eccentric wheel 702, and the other end is rotatably connected to the slide plate 8. The rotating shaft 701 is perpendicular to the electrode rod 2, and the transmission plate 703 is parallel to the electrode rod 2. The eccentric wheel 702 is eccentrically fixed relative to the rotating shaft 701, and their axes are parallel to each other. The transmission plate 703 is rotatably connected to both the eccentric wheel 702 and the slide plate 8. Therefore, when the rotating shaft 701 rotates around its own axis, the transmission plate 703 can be driven to reciprocate through the eccentric wheel 702. Since the slide plate 8 is slidably connected to the worktable 6, its direction of motion is determined. Therefore, the transmission plate 703 can only drive it to reciprocate linearly in a preset direction.

[0055] The slide plate 8 drives the spot welding head structure to achieve reciprocating linear motion. The drive of the slide plate 8 is that the rotating shaft 701 drives the transmission plate 703 through the eccentric wheel 702, and then the transmission plate 703 drives the slide plate 8 to perform linear reciprocating motion. Its drive component 7 adopts the action principle of linkage mechanism, which has higher reliability and stability compared with existing drive technology.

[0056] Specifically, the rotating shaft 701 is rotatably connected to the worktable 6 via a support, and eccentric wheels 702 are provided at both ends of the shaft. Each eccentric wheel 702 is equipped with a corresponding transmission plate 703, so that the drive assembly 7 and the slide plate 8 have two rotational connection points, thereby ensuring the stable and reliable movement of the slide plate 8. The rotation of the rotating shaft 701 relative to the worktable 6 can be driven by existing technology, such as direct drive by a motor, or indirect drive of the rotating shaft 701 by a motor through a transmission structure.

[0057] Example 5, such as Figure 4 and Figure 5As shown, the welding mechanism of the resistance spot welding machine can be set up with one or two and used together. Furthermore, the spot welding head structure of the resistance spot welding machine can be compatible with both vertical and horizontal layouts.

[0058] When there is one welding mechanism, the spot welding head of the resistance spot welding machine is arranged on one side, and the workpiece 9 to be welded is located on one side. Welding of the evaporator can be carried out step by step on one side, which facilitates the wiring of the spot welding machine and reduces the difficulty of equipment assembly and debugging.

[0059] When two welding mechanisms are arranged opposite each other, the sliding plates 8 of the two welding mechanisms can move synchronously relative to each other, and the workpiece 9 to be welded passes between the two welding mechanisms. This makes the spot welding heads arranged on both sides, forming a butt welding structure. The double-sided welding of the workpiece 9 can be completed in one action, which significantly improves the working efficiency of the spot welding machine.

[0060] Each slide plate 8 is independently driven by a corresponding drive component 7, which reduces the complexity of structural design and facilitates wiring layout. Each slide plate 8 is equipped with at least one spot welding head structure. If multiple spot welding head structures are provided, they are evenly distributed along the length of the slide plate 8 to facilitate multi-point welding of multiple workpieces 9 simultaneously, greatly improving the welding efficiency of the equipment. Furthermore, during welding, the synchronous relative movement of the two slide plates 8 is achieved by controlling a motor, which is existing technology and will not be elaborated further here.

[0061] Working principle of resistance spot welding machine:

[0062] The motor drives the rotating shaft 701 to rotate. The rotating shaft 701 drives the slide plate 8 to approach the workpiece 9 through the eccentric wheel 702 and the transmission plate 703, so that the spot welding head structure on the slide plate 8 contacts the part of the workpiece 9 to be welded. After the electrode rod 2 discharges and completes the welding, the rotating shaft 701 continues to rotate, and drives the slide plate 8 away from the workpiece 9 through the eccentric wheel 702 and the transmission plate 703, so that the workpiece 9 can adjust the welding position. This process is repeated until all welding parts of the workpiece 9 are completed.

[0063] In summary, this utility model proposes a spot welding head structure. By using the elastic clamp 102 to follow the dynamic elastic deformation of the welding process, the dynamic stability of the electrode pressure of the electrode rod 2 during the welding of the workpiece 9 can be ensured, thereby improving the weld yield and welding stability, extending the electrode service life, and reducing production and maintenance costs due to its simple structure. Furthermore, a resistance spot welding machine using this spot welding head structure is proposed. Its welding mechanism can be arranged on one side to facilitate wiring of the spot welding machine and reduce the difficulty of equipment assembly and debugging. At the same time, it can also be arranged on both sides to form a butt welding structure, which can complete the double-sided welding of the workpiece 9 in one action, significantly improving the working efficiency of the spot welding machine.

[0064] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many improvements and modifications under the guidance of the present invention without departing from the spirit and scope of the claims. These improvements and modifications should also be considered within the scope of protection of the present invention.

[0065] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0066] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

Claims

1. A spot welding head structure for evaporator welding, characterized in that: The device includes a support arm on which an electrode rod for welding is mounted. The support arm includes a base on which an elastic clamping plate is mounted. The electrode rod is connected to the elastic clamping plate. The base, the electrode rod, and the elastic clamping plate move synchronously. When the electrode rod is subjected to axial force, it can cause the elastic clamping plate to bend relative to the base and undergo elastic deformation.

2. The spot welding head structure for evaporator welding according to claim 1, characterized in that: The support arm has two elastic clamps spaced apart along the axial direction of the electrode rod. One end of each elastic clamp is connected by a top block, and the other end is connected by the base. The electrode rod is connected to the top block.

3. The spot welding head structure for evaporator welding according to claim 2, characterized in that: A limiting block is fixedly installed on the base. The limiting block is located inside the two elastic clamps. The side of the limiting block closest to the working end of the electrode rod is spaced apart from the elastic clamps, while the other side is in contact with the elastic clamps.

4. The spot welding head structure for evaporator welding according to claim 3, characterized in that: The support arms are arranged in pairs, and the two support arms are connected by a support plate. The two ends of the support plate are respectively connected to the two top blocks in the same group, and multiple electrode rods are installed on the support plate.

5. The spot welding head structure for evaporator welding according to claim 4, characterized in that: The electrode rod is fixedly installed on the support plate by a pressure plate. The electrode rod is located between the pressure plate and the support plate, and both the pressure plate and the support plate are provided with grooves that fit the outline of the electrode rod.

6. The spot welding head structure for evaporator welding according to claim 5, characterized in that: Two adjacent electrode rods are fixed to the support plate by the same pressure plate, and the electrode rods and the pressure plate are equidistantly distributed along the length of the support plate.

7. A resistance spot welding machine for evaporator welding, employing the spot welding head structure for evaporator welding as described in any one of claims 1-6, characterized in that: The resistance spot welding machine includes at least one welding mechanism, which includes a worktable. A slide plate for mounting the spot welding head structure is slidably disposed on the worktable. The electrode rod of the spot welding head structure is perpendicular to the length direction of the slide plate. The worktable is also provided with a drive component for driving the slide plate to reciprocate linearly along the axial direction of the electrode rod.

8. The resistance spot welding machine for evaporator welding according to claim 7, characterized in that: The welding mechanism is arranged in two opposite directions, and the sliding plates of the two welding mechanisms can move synchronously relative to each other, with the workpiece to be welded passing between the two welding mechanisms.

9. The resistance spot welding machine for evaporator welding according to claim 8, characterized in that: The drive assembly includes a rotating shaft, an eccentric wheel, and a transmission plate. The rotating shaft is rotatably mounted on the worktable, the eccentric wheel is fixedly mounted on the rotating shaft, one end of the transmission plate is movably sleeved on the eccentric wheel, and the other end is rotatably connected to the slide plate. The rotating shaft is perpendicular to the electrode rod, and the transmission plate is parallel to the electrode rod.

10. The resistance spot welding machine for evaporator welding according to claim 9, characterized in that: Each of the aforementioned slide plates is independently driven by the corresponding drive component, and each slide plate is provided with at least one of the aforementioned spot welding head structures, which are distributed along the length direction of the slide plate.

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