Open-close type induction heating coil connecting device using graphite sheet and copper plate butt joint

Abstract

A coil connection device for an openable induction heating device is disclosed, relating to the structural design of the connection device and the connection method between the connection device and the coil. Commonly available traditional induction heating devices typically employ a fixed structure, which is difficult to adapt to workpieces of different shapes and sizes, resulting in uneven heating and affecting processing quality. Openable induction heating devices, through the design of an openable inductor structure, achieve flexible clamping and uniform heating of the workpiece. However, the rigid connection of openable induction heating devices often suffers from problems such as arcing, severe wear after repeated use, and high maintenance difficulty and complexity. To solve these problems, this invention provides a connection device. This device increases the contact surface of the coil by L-shaped welding of a copper plate and a coil, and by assembling a graphite sheet between the copper plates, which is beneficial for the passage of large currents. Furthermore, the detachable graphite sheet not only ensures the passage of large currents but also significantly reduces the maintenance threshold and cost.

Description

Technical Field

[0001] This invention relates to a coil connection device for an openable induction heating device, specifically to the structural design and manufacturing of the coil connection device's connecting copper busbar and replaceable graphite sheet. In the field of industrial heating, traditional heating methods often suffer from drawbacks such as high energy consumption, uneven heating, and cumbersome operation. Induction heating technology, with its unique advantages, has gradually become the focus of the industry. This technology is based on the principle of electromagnetic induction, generating a high-frequency alternating magnetic field through an induction coil, inducing eddy currents inside the heated object, and thus achieving non-contact heating through the Joule heating effect. This heating method requires no physical contact; heat is generated directly inside the heated object, resulting in significant advantages such as fast heating speed, high efficiency, energy saving, and environmental friendliness. Background Technology

[0002] Currently, most traditional induction heating devices on the market are based on a fixed structure design. This design exhibits significant limitations when dealing with workpieces of different shapes and sizes, making it difficult to ensure uniform heating and thus affecting processing quality. Furthermore, the fixed structure presents operational inconveniences during workpiece loading and unloading, reducing production efficiency and failing to fully meet the demands of automated production processes. To address these challenges, the openable induction heating device, through innovative design, employs an openable inductor structure to achieve flexible clamping and uniform heating of various workpieces, significantly improving heating efficiency and processing accuracy, providing an effective technical solution for automated production. The design of the coil connection device is particularly critical, having a decisive impact on overall performance.

[0003] The fixed structure of traditional induction heating devices lacks the necessary flexibility, making it difficult to achieve an ideal magnetic field distribution when heating non-standard shaped workpieces, resulting in uneven heating. This uneven heating not only affects the final product quality but may also increase energy consumption and material waste during production. Furthermore, the high complexity of workpiece loading and unloading in a fixed structure directly leads to a decrease in production line operating efficiency, making it difficult to match the fast pace of modern automated production lines and limiting further increases in production capacity.

[0004] The openable induction heating process unit effectively overcomes the inherent defects of traditional devices by introducing an openable inductor design. This design allows the inductor to dynamically adjust according to the actual shape and size of the workpiece, ensuring a uniform distribution of the magnetic field during heating, thereby significantly improving heating efficiency and processing accuracy. This innovative design not only optimizes the heating process but also simplifies workpiece loading and unloading operations, improving the overall operating efficiency of the production line and better adapting to the needs of automated production. In particular, the optimized design of the coil connection device ensures the stability and efficiency of current transmission, further enhancing the reliability and performance of the unit.

[0005] The coil connection of openable induction heating devices typically uses a rigid connection method. This design makes it difficult to guarantee the stability and uniformity of current transmission when dealing with complex workpieces, thus affecting the heating effect and causing problems such as arcing at the connection point. This limitation is becoming increasingly prominent in modern efficient and automated production environments, becoming a bottleneck restricting the improvement of production efficiency and product quality. Therefore, the design of the coil connection device of the openable induction heating device is particularly important. This invention has a wide range of applications, especially suitable for industrial fields that require frequent loading and unloading of workpieces, have special requirements for the heating area, or have workpieces with varying diameters. For example, in the manufacturing of automotive parts, it can perform localized rapid heating of complex-shaped workpieces such as gears and bearings to meet the requirements of precision quenching processes; in the pretreatment of metal pipe welding, it can precisely control the heating area and avoid an excessively large heat-affected zone. Its openable design is also particularly suitable for heating large workpieces or workpieces with varying diameters, breaking through the limitations of traditional fixed coils on workpiece size. Summary of the Invention

[0006] The traditional rigid connection method of copper plates between the inductors at the opening and closing of high-current induction heating devices easily leads to gaps at the connection points, which can cause arcing when high current passes through. To overcome this limitation, this invention provides a connection device. The contact surface of this device not only ensures the stability and uniformity of high current transmission but also guarantees a close fit, solving problems such as difficulty in achieving a close fit with rigid connections and the tendency to arc during long-term use.

[0007] A coil connection device for an openable induction heating device, wherein a copper plate and a graphite sheet are welded to the coil as the main carriers for current flow, characterized in that: the copper plate and the coil are welded in an L-shape, and there are holes drilled on the side for cooling water; holes are drilled at the four corners of the copper plate for fixing the graphite sheet; the graphite sheet is replaceable, which can prevent wear of the copper plate, increase the contact area, and improve the current carrying capacity.

[0008] Furthermore, cooling water is circulated through the middle of the copper plate to ensure that the temperature does not become too high during the induction heating process of the workpiece. At the same time, there is a positioning hole at each of the four corners of the copper plate, and the designed graphite sheet is fixed to the surface of the copper plate by nylon screws.

[0009] In terms of structural design, this connecting device consists of two highly conductive copper plates and a graphite sheet as an intermediate conductor, such as... Figure 1 As shown, at the connection point of the opening and closing sensor, the graphite sheet acts as a flexible buffer, compensating for flatness errors between the copper plates, ensuring continuous tight contact, and preventing arcing under high current. Simultaneously, the high thermal conductivity of the graphite surface allows for rapid dissipation of concentrated heat from the copper busbar connection point, balancing temperature rise and improving current-carrying stability. The connection device of this invention ensures the continuity and reliability of current transmission during opening and closing.

[0010] In terms of manufacturing process, the coil of this openable induction heating device is welded to the copper busbar of the connecting device. This copper plate, as the main component carrying current in the induction heating coil, requires welding technology to ensure dimensional accuracy and connection strength of each component. Cooling water flows through the middle of the copper plate to prevent the temperature from becoming too high during workpiece induction heating. Additionally, there is a positioning hole at each of the four corners of the copper plate, and a specially designed graphite sheet is fixed to the surface of the copper plate with nylon screws. Figure 2 As shown.

[0011] The technical solution adopted by this invention to solve its technical problem is as follows: Based on the induction coil of the opening and closing induction heating process device, a copper plate for conducting electricity is welded to both ends of the two contact points of each turn of the coil in the induction heating process device (four copper plates for each turn of the coil with two contact points). This copper plate serves as the main part of the induction heating coil through which the current flows, such as... Figure 3 and 4 As shown. Simultaneously, drilling is designed at the four corners of the copper tubes on both sides to facilitate the subsequent application of graphite sheets, ensuring a full fit between the copper plates on both sides. The advantages of using graphite sheets as intermediate conductors are as follows: 1) The rigid connection between the copper plates causes wear on the copper plate surface after repeated opening and closing; using graphite sheets can act as a buffer layer to solve the wear problem; 2) Graphite sheets themselves have strong plasticity and conductivity, allowing for better fit with the copper plates on both sides under the pressure of the connecting copper plates, ensuring the continuity and reliability of current transmission; 3) Graphite sheets as intermediate conductors are detachable, improving the current-carrying capacity of the copper plate joints in the opening and closing induction heating device, increasing the overall service life of the equipment, and lowering the maintenance threshold. Attached Figure Description

[0012] Figure 1 This is a design drawing of a coil connection device, which mainly consists of three parts: a copper plate welded to the coils on both sides and a graphite sheet serving as the intermediate conductor.

[0013] Figure 2 This is the design drawing for the docking of this connecting device. When docking, the copper plates on both sides are pressed together, squeezing the graphite sheet in the middle. While the copper plates are pressed together, the conductive area is increased, ensuring the continuity and reliability of current transmission.

[0014] Figure 3 This is a design drawing showing the connection between the connecting device and the inductor coil. The copper plate serves as the main component in the induction heating coil through which the current flows. Figure 4 It is a design drawing showing the connection between the connecting device and the sensor coil in a closed state.

[0015] Figure 5 This is an example diagram of the connection device; Figure 6 This refers to the welding process between the coil and the copper plate.

[0016] for Figure 5 In the application example, the specific connection method between the coil and the copper plate is as follows: a 160mm high, 20mm thick, 180° arc-shaped copper busbar is welded to a 160mm×90mm×25mm copper plate. Sufficient contact can ensure good conductivity. Detailed Implementation

[0017] Figure 5 This is an example diagram of the opening and closing induction heating process device applying the present invention. The induction heating process device in the figure is designed with a rotating opening and closing structure. Two 160mm × 90mm × 25mm copper plates are respectively welded to coils on both sides. The coils are two 160mm high, 20mm thick, 180° arc-shaped copper busbars. A 160mm × 90mm × 10mm graphite sheet is mounted on the copper plate on the right side. The main structure of the present invention is shown in the figure as the copper plates on both sides and the graphite sheet fixed to the surface of the copper plates. The figure shows the position of the holes drilled in the copper plates when the device is open.

Claims

1. A coil connection device for an openable induction heating device, wherein a copper plate and an assembled graphite sheet are welded to the coil as the main carriers for current flow, characterized in that: The copper plate is welded to the coil in an L-shape, and there are holes drilled on the side for cooling water. Holes are drilled at the four corners of the copper plate to fix the graphite sheet. The graphite sheet is replaceable, which can prevent the copper plate from wearing out, increase the contact area, and improve the current carrying capacity.

2. A coil connection device for an openable induction heating device, characterized in that, Cooling water flows through the middle of the copper plate to ensure that the temperature does not get too high during the induction heating process of the workpiece. At the same time, there is a positioning hole at each of the four corners of the copper plate, and the designed graphite sheet is fixed to the surface of the copper plate with nylon screws.

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