Welding head of macromolecule diffusion welding equipment

Abstract

The utility model provides a welding head of macromolecule diffusion welding equipment, which comprises a copper seat and a graphite welding head, the copper seat is fixedly connected with the graphite welding head, the graphite welding head is fixedly provided with a metal plate, and a coil is wound on the outer side of the graphite welding head. The upper copper base is fixedly connected with the graphite welding head, the metal plate is fixedly installed on the welding face of the graphite welding head, the metal plate makes contact with a workpiece to be welded in the welding process, the graphite welding head is prevented from being abraded by the workpiece in the welding process, and the service life of the welding head is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of diffusion welding technology, specifically relating to a welding head for a polymer diffusion welding device. Background Technology

[0002] Polymer diffusion welding, also known as diffusion welding, is a solid-state welding method that applies pressure to a workpiece at high temperature without producing visible deformation or relative movement. Diffusion welding machines are used to press-weld the ends of workpieces (copper / aluminum foil flexible conductors) into shape. Existing technology generally uses the principle of resistance welding: a pressure device presses the workpiece tightly between upper and lower graphite electrodes (welding heads), and a large current is passed between the two electrodes, causing the workpiece to conduct electricity and heat up to 60% to 80% of the base material's melting point. Maintaining the temperature and pressure allows the foil layers to be pressed together.

[0003] Most existing diffusion welding heads use graphite, but graphite wears down after repeated welding, which shortens the service life of the graphite welding head. Utility Model Content

[0004] The purpose of this invention is to provide a welding head for a polymer diffusion welding device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a welding head for a polymer diffusion welding device, comprising a copper base and a graphite welding head, wherein the copper base is fixedly connected to the graphite welding head, a metal plate is fixedly mounted on the graphite welding head, and a coil is wound around the outside of the graphite welding head.

[0006] Preferably, an insulating block is fixedly mounted on the copper base. The insulating block has a through hole and an assembly groove surrounding the through hole. The graphite welding head passes through the through hole, and the coil is fixedly mounted in the assembly groove.

[0007] Preferably, the insulating block is made of asbestos or alumina ceramic.

[0008] Preferably, the wire of the coil is a copper tube.

[0009] Preferably, a heat insulation layer is provided between the copper base and the graphite welding head.

[0010] Preferably, the metal plate is made of tungsten alloy.

[0011] Preferably, the graphite welding head is fixedly mounted on the metal plate by a fixing block.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention features a graphite welding head fixedly connected to an upper copper base, with a metal plate fixedly installed on the welding surface of the graphite welding head. During welding, the metal plate contacts the workpiece to be welded, preventing the graphite welding head from being worn by the workpiece during welding and improving the service life of the welding head.

[0014] This invention involves wrapping copper wire around the outside of a graphite welding head. The copper wire is connected to a high-frequency device, which heats the graphite welding head through electromagnetic induction. When welding the next workpiece, the heated graphite welding head is kept warm to ensure that the temperature of the welding head is maintained at the working temperature while welding the workpiece. This shortens the welding process, prevents the occurrence of incomplete welds, improves processing efficiency, and enhances welding quality. Attached Figure Description

[0015] Figure 1 This is a structural view of the present invention.

[0016] Figure 2 This is an internal structural view of the present invention.

[0017] Figure 3 This is an exploded structural view of the present invention.

[0018] Figure 4 This is a cross-sectional structural view of the present invention.

[0019] Figure 5 This is a structural view of the insulating block of this utility model.

[0020] The diagram is labeled as follows: 1. Copper base; 2. Graphite welding head; 3. Metal plate; 4. Coil; 5. Insulating block; 6. Through hole; 7. Assembly groove; 8. Heat insulation layer; 9. Fixing block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1:

[0023] like Figures 1-5As shown, the present invention provides a welding head for a polymer diffusion welding device, comprising a copper base 1 and a graphite welding head 2. The copper base 1 is fixedly connected to the graphite welding head 2, and a metal plate 3 is fixedly mounted on the graphite welding head 2. A coil 4 is wound around the outside of the graphite welding head 2. An insulating block 5 is fixedly mounted on the copper base 1. The insulating block 5 has a through hole 6 and an assembly groove 7 surrounding the through hole 6. The graphite welding head 2 passes through the through hole 6, and the coil 4 is fixedly mounted in the assembly groove 7. The insulating block 5 is made of asbestos or alumina ceramic. The wire of the coil 4 is a copper tube. A heat insulation layer 8 is provided between the copper base 1 and the graphite welding head 2. The metal plate 3 is made of tungsten alloy. The graphite welding head 2 is fixedly mounted on the metal plate 3 by a fixing block 9.

[0024] Through the above technical solution, the present invention fixes the graphite welding head 2 to the upper copper base 1, and fixes the metal plate 3 on the welding surface of the graphite welding head 2. During welding, the metal plate 3 contacts the workpiece to be welded, preventing the graphite welding head 2 from being worn by the workpiece during welding and improving the service life of the welding head.

[0025] This invention features a copper wire wound around the outside of a graphite welding head 2. The copper wire is connected to a high-frequency device, which heats the graphite welding head 2 through electromagnetic induction. When welding the next workpiece, the graphite welding head 2 is kept warm to ensure that the temperature of the welding head is maintained at the working temperature while welding the workpiece. This shortens the welding process, prevents the occurrence of incomplete welds, improves processing efficiency, and enhances welding quality.

[0026] Example 2:

[0027] like Figures 1-5 As shown, this utility model mainly consists of a copper base 1 and a graphite welding head 2. The copper base 1 is fixedly connected to the graphite welding head 2 by bolts, ensuring a tight fit between the two. A metal plate 3 is fixedly installed on the welding surface of the graphite welding head 2. The size of the metal plate 3 is slightly smaller than the welding surface of the graphite welding head 2 to ensure complete coverage of the working area. A coil 4 is wound around the outside of the graphite welding head 2. Connecting wires are led out from both ends of the coil 4 for connection to an external high-frequency power supply. The presence of the metal plate 3 prevents the workpiece from directly contacting the graphite welding head 2 during welding, reducing wear on the graphite welding head 2. The magnetic field generated when the coil 4 is energized can quickly heat the graphite welding head 2, maintaining the stability of the welding temperature. During welding, the polymer material to be welded is placed on the metal plate 3, and by applying pressure and temperature, molecular-level bonding is formed between the materials. The presence of the metal plate 3 also improves the heat distribution, making the welding more uniform.

[0028] Example 3:

[0029] like Figures 1-5As shown, an insulating block 5 is fixedly installed on the copper base 1 of this utility model. The insulating block 5 adopts a ring structure and is made of high-temperature wear-resistant ceramic. A circular through hole 6 is provided on the insulating block 5, the diameter of which is slightly larger than the diameter of the graphite welding head 2, allowing the graphite welding head 2 to pass through. An assembly groove 7 is provided on the insulating block 5 for mounting the coil 4. The graphite welding head 2 is made of high-purity graphite material, and its surface is precision-machined to ensure flatness. The graphite welding head 2 passes through the through hole 6 of the insulating block 5 and is tightly connected to the copper base 1. The connection method is a threaded connection to ensure good conductivity. The coil 4 is installed in the assembly groove 7 of the insulating block 5. Connecting wires are led out from both ends of the coil 4, passing through the wire groove inside the copper base 1, and connected to an external high-frequency power supply. The presence of the insulating block 5 ensures electrical isolation between the coil 4 and the graphite welding head 2, preventing short circuits. During the welding process, the high-frequency power supply supplies power to the coil 4, generating an alternating magnetic field. This magnetic field induces eddy currents inside the graphite welding head 2, thereby achieving rapid heating of the graphite welding head 2, heat preservation of the graphite welding head 2, and improving welding efficiency and welding quality.

[0030] Example 4:

[0031] like Figures 1-5 As shown, the insulating block 5 of this invention is made of asbestos or alumina ceramic material. These two materials were chosen because of their excellent insulation and high-temperature resistance. Asbestos material has good thermal insulation and fire resistance, and can maintain stable physical and chemical properties at high temperatures. Alumina ceramic has high hardness, high strength, and excellent wear resistance, while also possessing good thermal stability and electrical insulation. The insulating block 5 is cylindrical in shape with a through hole 6 in the center for the graphite welding head 2 to pass through. The inner wall of the through hole 6 is precision machined to minimize the gap between the through hole and the graphite welding head 2, preventing heat loss. An assembly groove 7 is provided on the outer periphery of the insulating block 5 for mounting the coil 4. The insulating block 5 enables the welding head to maintain stable performance under high-temperature, high-frequency operating conditions, extending its service life while ensuring operational safety.

[0032] Example 5:

[0033] like Figures 1-5As shown, the copper base 1 of this invention is fixedly connected to the graphite welding head 2, and a metal plate 3 is installed on the welding surface of the graphite welding head 2. A coil 4 is wound around the outside of the graphite welding head 2, and the wire of the coil 4 is made of copper tubing. The coil 4 is composed of a hollow copper tube with multiple turns, and the inside of the copper tube is open, allowing connection to an external cooling system. The two ends of the coil 4 are connected to a high-frequency power supply through wires to generate an electromagnetic field to heat the graphite welding head 2. During the welding process, the high-frequency power supply inputs alternating current to the coil 4, generating eddy currents inside the graphite welding head 2, converting electrical energy into heat energy, and causing the welding head to heat up rapidly. By adjusting the frequency and intensity of the input current, the temperature of the welding head can be precisely controlled, allowing for heat preservation of the welding head or providing welding temperature. After welding is completed, the high-frequency power supply is turned off, and the welding head can then be cooled through the copper tube. An external cooling system is connected to the copper tube, and a cooling liquid (such as water or antifreeze) is pumped in. The cooling liquid circulates rapidly inside the copper tube, carrying away the heat from the welding head. Because copper has excellent thermal conductivity, heat is rapidly transferred from the graphite welding head 2 to the copper tube, and then carried away by the coolant, achieving rapid cooling of the welding head. This cooling method has multiple advantages. First, the cooling speed is fast, and the welding head temperature can be reduced to a safe level in a short time, reducing operator waiting time and minimizing safety hazards.

[0034] Example 6:

[0035] like Figures 1-5 As shown, a heat insulation layer 8 is provided between the copper base 1 and the graphite welding head 2 in this invention. The copper base 1 serves as a support and fixing structure and is tightly connected to the graphite welding head 2. A layer of heat insulation material is provided between the contact surfaces of the copper base 1 and the graphite welding head 2, forming effective thermal isolation. The heat insulation layer 8 is made of a high-temperature resistant material with low thermal conductivity. This heat insulation material has a uniform thickness and covers the entire contact area. The presence of the heat insulation layer 8 significantly reduces heat conduction from the graphite welding head 2 to the copper base 1, reducing heat loss during the welding process. The effect of the heat insulation layer 8 is particularly significant when welding low-melting-point materials (such as aluminum busbars). The operator inputs a high-frequency current into the coil 4 wound around the graphite welding head 2 through a high-frequency device. The alternating magnetic field generated by the coil 4 induces eddy currents inside the graphite welding head 2, and the eddy current heating causes the temperature of the graphite welding head 2 to rise rapidly to the required welding temperature. Due to the presence of the heat insulation layer 8, the heat generated by the graphite welding head 2 is mainly concentrated in the welding area and is not transferred in large quantities to the copper base 1. This heat concentration helps to improve welding efficiency and reduce energy waste. Meanwhile, because heat is not easily lost, the energy input required to maintain the welding temperature is correspondingly reduced, further saving energy. The heat insulation layer 8 also plays a role in stabilizing the welding temperature. During the welding process, fluctuations in the external ambient temperature or changes in the temperature of the copper base 1 have a significantly reduced impact on the temperature of the graphite welding head 2. This temperature stability is crucial for accurately controlling the welding process and ensuring welding quality.

[0036] Example 7:

[0037] like Figures 1-5 As shown, the metal plate 3 of this invention is made of tungsten alloy. This metal plate 3 is fixedly mounted on the welding surface of the graphite welding head 2, serving as a protective layer that directly contacts the workpiece to be welded. Tungsten alloy possesses excellent wear resistance, impact resistance, and high-temperature resistance, maintaining good mechanical properties even under high-temperature and high-pressure welding environments. During welding, the tungsten alloy metal plate 3 withstands friction and impact from the workpiece, effectively reducing direct wear on the graphite welding head 2. The use of the tungsten alloy metal plate 3 significantly extends the service life of the welding head. Traditional graphite welding heads 2 are prone to frequent replacement due to wear during continuous operation, a problem solved by the introduction of the tungsten alloy metal plate 3. The high melting point of tungsten alloy also ensures the stability of the metal plate 3 in high-temperature welding environments, preventing deformation or melting. In practical applications, the tungsten alloy metal plate 3 and the graphite welding head 2 are precisely machined to achieve a tight fit, ensuring electrical connection and maximizing heat transfer efficiency. The application of the tungsten alloy metal plate 3 not only improves the durability of the welding head but also indirectly enhances the welding quality. Reduced welding head wear ensures consistent welding parameters, resulting in more stable welding quality during continuous production. This improvement lowers equipment maintenance frequency and reduces downtime, thereby increasing overall production efficiency. In summary, using a tungsten alloy metal plate 3 as the protective layer for the graphite welding head 2 fully utilizes the excellent properties of tungsten alloy, such as wear resistance, impact resistance, and high-temperature stability, effectively solving the problem of easy wear of traditional graphite welding heads 2, extending welding head life, and improving welding quality and production efficiency.

[0038] Example 8:

[0039] like Figures 1-5 As shown, the graphite welding head 2 of this invention is fixedly mounted on a metal plate 3 via a fixing block 9. The fixing block 9 acts as a connector, forming a stable mechanical connection between the graphite welding head 2 and the metal plate 3, ensuring a tight fit between the two under high temperature and high pressure conditions, and guaranteeing electrical and thermal conductivity. During the welding process, the fixing block 9 not only provides mechanical fixation but also participates in heat and electrical transfer. By using the fixing block 9 to fix the metal plate 3, this design significantly improves the structural stability and reliability of the welding head assembly.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A welding head for a polymer diffusion welding device, comprising a copper base and a graphite welding head, wherein the copper base is fixedly connected to the graphite welding head, characterized in that, The graphite welding head is fixedly mounted with a metal plate, and a coil is wound around the outside of the graphite welding head; an insulating block is fixedly mounted on the copper base, the insulating block has a through hole and an assembly groove arranged around the through hole, the graphite welding head passes through the through hole, and the coil is fixedly mounted in the assembly groove.

2. The welding head of a polymer diffusion welding device according to claim 1, characterized in that, The insulating block is made of asbestos or alumina ceramic.

3. The welding head of the polymer diffusion welding equipment according to claim 1, characterized in that, The coil's conductor is a copper tube.

4. The welding head of a polymer diffusion welding device according to claim 1, characterized in that, A heat insulation layer is provided between the copper base and the graphite welding head.

5. The welding head of a polymer diffusion welding device according to claim 1, characterized in that, The metal plate is made of tungsten alloy.

6. The welding head of a polymer diffusion welding device according to claim 1, characterized in that, The graphite welding head is fixedly mounted on the metal plate by a fixing block.

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