Resistance welding equipment for multi-spot welding

Abstract

The utility model discloses a resistance welding device for multipoint welding, which comprises a rack, a plurality of electrode assemblies and a cooling system, each electrode assembly comprises two electrodes installed on the rack, the two electrodes of the same electrode assembly are arranged at intervals in the height direction of the rack and can be close to or far away from each other, and the cooling system is arranged on the rack. A cooling channel is formed in each electrode, and a liquid inlet and a liquid outlet which are communicated with the cooling channel are formed in each electrode; and the cooling system is communicated with the liquid inlet and the liquid outlet of each electrode and is used for circularly supplying cooling liquid into the cooling channel. According to the technical scheme, the stability and the welding quality of resistance welding can be improved, the service life of the electrode is prolonged, and the consistency of multi-point welding is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance welding, and particularly relates to a resistance welding device for multi-point welding. Background Art

[0002] Multi-point welding is a welding technology widely used in industrial production, especially in fields such as automobile manufacturing and electronic product assembly. This technology allows multiple weld points to be welded simultaneously in a single operation, greatly improving production efficiency. Resistance welding is a commonly used method in multi-point welding, and its principle is to use the Joule heat generated when current passes through the materials to be welded to achieve welding. During the resistance welding process, a large current is conducted through the electrodes to the workpiece, generating high temperature at the contact points of the workpiece, melting the metal and forming weld points. This method has the advantages of high speed, high automation degree, and stable welding quality.

[0003] However, the resistance welding technology faces serious thermal management challenges in practical applications. During the welding process, the electrodes are subjected to high temperature and large current, which easily leads to overheating of the electrodes. Excessive electrode temperature will cause a series of problems: First, overheating will cause the electrode material to soften, deform, or even melt, seriously shortening the service life of the electrodes; Second, too high electrode temperature will affect the welding quality, possibly causing overheating of the weld points, insufficient penetration, or insufficient welding strength; Third, during continuous welding, the cumulative increase in electrode temperature will cause the quality of subsequent weld points to gradually decline, affecting the consistency of the product. Especially in multi-point welding, multiple electrodes work simultaneously, and the heat accumulation problem is more serious. If the temperature of each electrode cannot be effectively controlled, it is easy to cause quality differences between different weld points. Therefore, an effective cooling system is crucial for ensuring the stability of resistance welding, improving welding quality, extending the life of electrodes, and ensuring the consistency of multi-point welding. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a resistance welding device for multi-point welding, aiming to improve the stability and welding quality of resistance welding, extend the life of electrodes, and ensure the consistency of multi-point welding.

[0005] To achieve the above object, the resistance welding device for multi-point welding proposed by the utility model includes a frame, a plurality of electrode assemblies, and a cooling system. Each electrode assembly includes two electrodes mounted on the frame. The two electrodes of the same electrode assembly are spaced apart in the height direction of the frame and can approach or separate from each other. Each electrode is formed with a cooling channel, and each electrode is formed with a liquid inlet and a liquid outlet communicating with the cooling channel; the cooling system is communicated with the liquid inlets and liquid outlets of the respective electrodes for circulating and supplying coolant to the cooling channels.

[0006] Optionally, the cooling channel includes an inlet channel, an outlet channel, and a connecting channel. Both the inlet channel and the outlet channel extend in the height direction of the frame. The end of the inlet channel far from the working end of the electrode communicates with the liquid inlet, and the end of the inlet channel close to the working end of the electrode communicates with the end of the outlet channel close to the working end of the electrode through the connecting channel. The end of the outlet channel far from the working end of the electrode communicates with the liquid outlet.

[0007] Optionally, the inlet channel extends in a spiral shape.

[0008] Optionally, the pitch of the inlet channel gradually decreases in the direction from the liquid inlet to the working end of the electrode.

[0009] Optionally, the outlet channel extends in a spiral shape.

[0010] Optionally, the pitch of the outlet channel gradually decreases in the direction from the liquid outlet to the working end of the electrode.

[0011] Optionally, the cross-section of the inlet channel is elliptical.

[0012] Optionally, the cross-section of the outlet channel is elliptical.

[0013] Optionally, the cross-section of the connecting channel is elliptical.

[0014] Optionally, the effective flow area of the inlet channel gradually decreases in the direction from the liquid inlet to the working end of the electrode to increase the flow rate of the coolant in the area close to the working end of the electrode.

[0015] Optionally, the effective flow area of the outlet channel gradually increases in the direction from the working end of the electrode to the liquid outlet to reduce the flow resistance of the coolant in the outlet channel.

[0016] Optionally, a plurality of convex portions are provided on the inner wall of the cooling channel, and the plurality of convex portions are spaced apart.

[0017] The resistance welding equipment for multi - point welding in the technical solution of the present utility model effectively solves the heat management problem in the resistance welding process by arranging independent cooling channels inside each electrode and equipping a unified cooling system. This design enables precise temperature control for each electrode, significantly reducing the risk of electrode overheating. The cooling system circulates and supplies coolant into the cooling channels, which can not only quickly remove the heat generated during the welding process but also maintain the stability of the electrode temperature. This solution effectively prevents the softening and deformation of the electrode material, greatly extending the service life of the electrode. At the same time, by precisely controlling the temperature of each electrode, the present invention ensures the stability and consistency of the welding quality, effectively solving the problem of quality differences between different solder joints in multi - point welding. In addition, the independent cooling channel design allows for personalized cooling according to the working conditions of different electrodes, further improving the flexibility and adaptability of multi - point welding. Therefore, the present invention not only significantly improves the welding quality and production efficiency but also reduces the frequency of electrode replacement and maintenance costs, providing a more reliable and efficient solution for the application of resistance welding technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 FIG. is a schematic structural diagram of an embodiment of the resistance welding equipment for multi - point welding of the present utility model;

[0020] Figure 2 is Figure 1 a schematic structural diagram of an electrode assembly;

[0021] Figure 3 FIG. is a schematic diagram of the shape of the cooling channel.

[0022] Explanation of the reference numerals in the drawings:

[0023] 1, frame; 2, electrode assembly; 21, electrode; 211, cooling channel; 211a, water inlet channel; 211b, water outlet channel; 211c, connection channel; 212, liquid inlet; 213, liquid outlet; 3, cooling system.

[0024] The realization, functional features, and advantages of the object of the present utility model will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" throughout the text includes three solutions. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution that both A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, which must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] The present invention provides a resistance welding device for multi-point welding.

[0029] In the embodiment of the present invention, as Figures 1 to 3 shown, the resistance welding device for multi-point welding includes a frame 1, a plurality of electrode assemblies 2, and a cooling system 3. Each electrode assembly 2 includes two electrodes 21 mounted on the frame 1. The two electrodes 21 of the same electrode assembly 2 are spaced apart in the height direction of the frame 1 and can approach or separate from each other. A cooling channel 211 is formed in each electrode 21, and a liquid inlet 212 and a liquid outlet 213 communicating with the cooling channel 211 are formed on each electrode 21. The cooling system 3 is communicated with the liquid inlets 212 and the liquid outlets 213 of the respective electrodes 21 for circulatingly supplying a coolant into the cooling channels 211.

[0030] Specifically, the frame 1 is the support structure of the entire device, providing an installation foundation for the electrode assembly 2. Each electrode assembly 2 includes two electrodes 21, and these two electrodes 21 are spaced apart in the height direction of the frame 1. This setting creates a space between the upper and lower electrodes 21 for placing the workpiece to be welded. The electrodes 21 can move closer to or farther from each other, and this adjustability allows the device to adapt to workpieces of different thicknesses.

[0031] The coolant can be various types of liquids, and common choices include deionized water or mineral oil. Deionized water is a type of water that has been specially treated to remove most minerals and ions and has extremely low electrical conductivity. Mineral oil is a refined petroleum product that naturally has good insulating properties.

[0032] The cooling system 3 includes a coolant storage tank, a circulation pump, a heat exchanger, a pipeline system, and a control unit. The coolant storage tank is used to store and replenish the coolant. The circulation pump is responsible for driving the coolant to flow throughout the system. The heat exchanger is used to transfer the heat absorbed from the electrodes 21 to the external environment to keep the coolant at a low temperature. The pipeline system connects all components and the electrodes 21 to form a closed circulation loop. The control unit is responsible for monitoring and regulating the temperature, flow rate, and pressure of the coolant to ensure the stability of the cooling effect.

[0033] Although coolant is introduced into the electrodes 21, this will not have a negative impact on the welding of the electrodes 21. Instead, it can significantly improve the working state of the electrodes 21. This is because the coolant has extremely low electrical conductivity and will not form an additional current path, will not shunt or interfere with the welding current. At the same time, the coolant can effectively carry away the heat generated during the welding process to prevent the electrodes 21 from overheating. By maintaining an appropriate working temperature, the coolant helps the electrodes 21 maintain the best electrical conductivity and mechanical strength. The stability of the temperature also ensures the consistency of the welding parameters and improves the welding quality. In addition, effective cooling can prevent the softening and deformation of the electrode 21 material and extend the service life of the electrodes 21. Therefore, using coolant not only does not interfere with the welding process, but can significantly improve the working efficiency and welding quality of the electrodes 21.

[0034] It should be noted that even if the coolant has conductivity, it will not affect the cooling effect and welding performance of the electrode 21 in this solution. This is because the design of the cooling channel 211 inside the electrode 21 has been carefully considered to ensure that the coolant maintains an appropriate distance and isolation from the conductive part of the electrode 21. However, in order to further improve the safety and reliability of the equipment, an insulating coating can be provided on the inner wall surface of the cooling channel 211. Such insulating coatings can be materials such as epoxy resin, polytetrafluoroethylene, or ceramics, which have excellent insulation properties and heat resistance. The application of the insulating coating can not only prevent possible current leakage but also protect the cooling channel 211 from corrosion that the coolant may cause, extending the service life of the electrode 21. In addition, some insulating coatings have good thermal conductivity, which can further enhance the cooling efficiency. By providing an insulating coating on the inner wall of the cooling channel 211, this solution can adapt to a wider range of coolant selections while maintaining efficient cooling performance and reliable electrical isolation, providing greater operational flexibility and safety for the multi-point resistance welding equipment.

[0035] It can be understood that the resistance welding equipment for multi-point welding in the technical solution of the present utility model effectively solves the heat management problem during the resistance welding process by providing independent cooling channels 211 inside each electrode 21 and equipping a unified cooling system 3. This design enables precise temperature control for each electrode 21, significantly reducing the risk of overheating of the electrode 21. The cooling system 3 circulates and supplies coolant into the cooling channel 211, which can not only quickly remove the heat generated during the welding process but also maintain the temperature stability of the electrode 21. This solution effectively prevents softening and deformation of the electrode 21 material, greatly extending the service life of the electrode 21. At the same time, by precisely controlling the temperature of each electrode 21, the present invention ensures the stability and consistency of the welding quality, effectively solving the problem of quality differences between different solder joints in multi-point welding. In addition, the design of the independent cooling channel 211 allows for personalized cooling according to the working conditions of different electrodes 21, further improving the flexibility and adaptability of multi-point welding. Therefore, the present invention not only significantly improves the welding quality and production efficiency but also reduces the frequency of electrode 21 replacement and maintenance costs, providing a more reliable and efficient solution for the application of resistance welding technology.

[0036] Optionally, the cooling channel 211 includes an inlet channel 211a, an outlet channel 211b, and a connecting channel 211c. Both the inlet channel 211a and the outlet channel 211b extend in the height direction of the frame 1. The end of the inlet channel 211a away from the working end of the electrode 21 is communicated with the liquid inlet 212. The end of the inlet channel 211a near the working end of the electrode 21 is communicated with the end of the outlet channel 211b near the working end of the electrode 21 through the connecting channel 211c. The end of the outlet channel 211b away from the working end of the electrode 21 is communicated with the liquid outlet 213.

[0037] The design that both the inlet channel 211a and the outlet channel 211b extend in the height direction of the frame 1 enables the coolant to evenly cover the entire length of the electrode 21, ensuring the consistency of the cooling effect. This structure is also beneficial for maintaining the temperature balance inside the electrode 21 and reducing the problem of uneven heat distribution. Secondly, the design that the end of the inlet channel 211a away from the working end of the electrode 21 is communicated with the liquid inlet 212 and the end of the outlet channel 211b away from the working end of the electrode 21 is communicated with the liquid outlet 213 forms a complete cooling circuit, ensuring the continuous flow of the coolant and improving the cooling efficiency. In addition, the design that the inlet channel 211a and the outlet channel 211b are connected by the connecting channel 211c near the working end of the electrode 21 causes the coolant to form a U-shaped turn in the area where cooling is most needed (i.e., near the working end of the electrode 21), increasing the residence time of the coolant in this area and strengthening the cooling effect on the working end.

[0038] Optionally, the inlet channel 211a extends in a spiral shape. The spiral inlet channel 211a significantly increases the contact area between the coolant and the inner wall of the electrode 21. Compared with a straight channel, the spiral channel can achieve a longer cooling path within the same length of the electrode 21, which means that the coolant has more opportunities to exchange heat with the inner wall of the electrode 21. The increased contact area directly improves the cooling efficiency, enabling heat to be transferred from the electrode 21 to the coolant more quickly and evenly.

[0039] The spiral design creates a more complex hydrodynamic environment. When the coolant flows in the spiral channel, a certain degree of turbulence will be generated. This turbulence effect can break the coolant boundary layer, promote the diffusion of heat in the liquid, and further enhance the heat exchange efficiency. At the same time, the turbulence also helps to prevent the formation of temperature stratification in the channel, ensuring the uniformity of the cooling effect.

[0040] Furthermore, the design of the spiral channel extends the flow path of the coolant inside the electrode 21. This extended path increases the residence time of the coolant inside the electrode 21, providing more ample opportunities for heat exchange. Especially in the case of high-frequency welding, the extended cooling path can better cope with the rapidly accumulating heat.

[0041] Finally, the design of the spiral inlet channel 211a also helps to reduce the pressure loss of the coolant. Compared with the channel design with right-angle turns, the progressive spiral turning allows the coolant to flow more smoothly, reducing the local pressure loss caused by sharp turns, thereby improving the efficiency of the entire cooling system 3.

[0042] Optionally, the pitch of the inlet channel 211a gradually decreases in the direction from the liquid inlet 212 to the working end of the electrode 21. Specifically, the pitch refers to the axial distance between two adjacent turns in the spiral structure. In this embodiment, the pitch specifically refers to the axial distance between two adjacent turns of the spiral structure of the inlet channel 211a. Simply put, if we imagine the spiral inlet channel 211a as a spring, the pitch is the interval between two adjacent turns of the spring.

[0043] Generally, the temperature of the working end of the electrode 21 is the highest, while the temperature at other positions is lower. By adjusting the pitch, the flow characteristics of the coolant can be matched with the temperature distribution of the electrode 21. At positions other than the working end, a slower flow rate allows for sufficient heat exchange; while at the working end with a higher temperature, the increased flow rate can carry away heat faster, preventing local overheating. The higher flow rate can also prevent the coolant from staying in the high-temperature area for too long, avoiding the risk of local overcooling or boiling. At the same time, it helps to keep the cooling channel 211 clean and reduce impurity deposition.

[0044] Similarly, the outlet channel 211b extends in a spiral shape. And the pitch of the outlet channel 211b gradually decreases in the direction from the liquid outlet 213 to the working end of the electrode 21. The effects of such a design can be referred to the inlet channel 211a and will not be elaborated here.

[0045] Optionally, the cross-section of the inlet channel 211a is elliptical, the cross-section of the outlet channel 211b is elliptical, and the cross-section of the connecting channel 211c is elliptical.

[0046] Compared with a circular cross-section, an elliptical cross-section provides a larger perimeter for the same area. This means that there is a larger contact area between the coolant and the channel wall. The larger contact area directly improves the heat exchange efficiency, enabling the coolant to absorb the heat generated by the electrode 21 more quickly and effectively.

[0047] Compared with circular channels, elliptical channels can reduce the turbulent loss of fluid while maintaining good fluidity. This helps to reduce the pressure loss of the cooling system 3 and improve the overall cooling efficiency.

[0048] Optionally, the effective flow area of the water inlet channel 211a gradually decreases in the direction from the liquid inlet 212 to the working end of the electrode 21, so as to increase the flow rate of the coolant in the area near the working end of the electrode 21.

[0049] The main purpose of this design is to control and regulate the flow rate of the coolant. When the coolant enters from the liquid inlet 212, due to the relatively wide channel, the flow rate is relatively slow. As the coolant flows towards the working end of the electrode 21, the channel gradually narrows, resulting in a gradual increase in the flow rate. This changing flow rate design can better match the temperature distribution of the electrode 21, especially providing a stronger cooling effect in the working end area with the highest temperature. The increase in the flow rate can not only prevent the coolant from staying in the high-temperature area for too long, avoiding local overcooling, but also enhance the turbulent effect and improve the heat exchange efficiency. In addition, this design can also optimize the pressure distribution of the coolant and compensate for the pressure loss caused by friction.

[0050] Optionally, the effective flow area of the water outlet channel 211b gradually increases in the direction from the working end of the electrode 21 to the liquid outlet 213, so as to reduce the flow resistance of the coolant in the water outlet channel 211b. Specifically, this design is complementary to the design of the water inlet channel 211a. As the coolant flows from the working end of the electrode 21 towards the liquid outlet 213, the channel gradually widens, causing the flow rate to gradually decrease. This change helps to reduce the pressure loss of the coolant in the water outlet channel 211b and facilitates the smooth discharge of the coolant. At the same time, the gradual decrease in the flow rate is also beneficial for further heat exchange, ensuring that the coolant fully absorbs the heat of the electrode 21. This design not only improves the overall efficiency of the cooling system 3, but also reduces the load on the coolant pump and energy consumption. In addition, the gradually increasing area of the water outlet channel 211b can also prevent the coolant from generating eddy currents or cavitation phenomena in the channel, ensuring the stable operation of the cooling system 3. Generally speaking, this design optimizes the flow characteristics of the coolant, improves the cooling efficiency, and also enhances the reliability and durability of the cooling system 3.

[0051] Optionally, a plurality of protrusions are provided on the inner wall of the cooling channel 211, and the plurality of protrusions are distributed at intervals. The main purpose of setting these protrusions is to enhance the turbulent effect of the coolant, thereby improving the heat exchange efficiency. When the coolant flows through these protrusions, local turbulence will be generated, breaking the laminar state of the coolant. This turbulent effect can significantly increase the heat exchange rate between the coolant and the channel wall, enabling heat to be transferred from the electrode 21 to the coolant more quickly and evenly. At the same time, these protrusions can also increase the effective surface area of the cooling channel 211, further enhancing the heat exchange efficiency. In addition, appropriately designed protrusions can also guide the flow direction of the coolant, ensuring that the coolant can evenly cover the entire channel surface and avoiding cooling dead spots.

[0052] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A resistance welding device for multi-point welding, characterized in that: include: Rack (1); A plurality of electrode assemblies (2), each of the electrode assemblies (2) comprising two electrodes (21) mounted on the frame (1), the two electrodes (21) of the same electrode assembly (2) being arranged at intervals in the height direction of the frame (1) and being able to be close to or far from each other, a cooling channel (211) being formed in each of the electrodes (21), and a liquid inlet (212) and a liquid outlet (213) being formed on each of the electrodes (21) and communicating with the cooling channel (211); and, A cooling system (3), the cooling system (3) being in communication with the liquid inlet (212) and the liquid outlet (213) of each of the electrodes (21), and being used for circulating cooling liquid into the cooling channel (211).

2. The resistance welding device for multi-spot welding according to claim 1, characterized in that: The cooling channel (211) comprises a water inlet channel (211a), a water outlet channel (211b) and a connecting channel (211c); the water inlet channel (211a) and the water outlet channel (211b) both extend in the height direction of the frame (1); an end of the water inlet channel (211a) away from the working end of the electrode (21) is connected to the liquid inlet (212); an end of the water inlet channel (211a) close to the working end of the electrode (21) is connected to an end of the water outlet channel (211b) close to the working end of the electrode (21) through the connecting channel (211c); and an end of the water outlet channel (211b) away from the working end of the electrode (21) is connected to the liquid outlet (213).

3. The resistance welding device for multi-spot welding according to claim 2, characterized in that: The water inlet channel (211a) extends in a spiral shape.

4. The resistance welding device for multi-spot welding according to claim 3, characterized in that: The pitch of the water inlet channel (211a) gradually decreases in the direction from the liquid inlet (212) to the working end of the electrode (21).

5. The resistance welding device for multi-spot welding according to claim 2, characterized in that: The water outlet channel (211b) extends in a spiral shape.

6. The resistance welding device for multi-spot welding according to claim 5, characterized in that: The pitch of the water outlet channel (211b) gradually decreases in the direction from the liquid outlet (213) to the working end of the electrode (21).

7. The resistance welding device for multi-spot welding according to claim 2, characterized in that: The cross section of the water inlet channel (211a) is elliptical; and / or, The cross section of the water outlet channel (211b) is elliptical; and / or, The cross section of the connecting channel (211c) is elliptical.

8. The resistance welding device for multi-spot welding according to claim 2, characterized in that: The effective flow area of ​​the water inlet channel (211a) gradually decreases in the direction from the liquid inlet (212) to the working end of the electrode (21), so as to increase the flow rate of the cooling liquid in the area close to the working end of the electrode (21).

9. The resistance welding device for multi-spot welding according to claim 2, characterized in that: The effective flow area of ​​the water outlet channel (211b) gradually increases in the direction from the working end of the electrode (21) to the liquid outlet (213), so as to reduce the flow resistance of the cooling liquid in the water outlet channel (211b).

10. The resistance welding device for multi-spot welding according to claim 1, characterized in that: A plurality of protrusions (214) are provided on the inner wall of the cooling channel (211), and the plurality of protrusions (214) are distributed at intervals.

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