Heating plate structure for vacuum eutectic furnace

Abstract

The invention relates to the technical field of vacuum welding, in particular to a heating plate structure for a vacuum eutectic furnace. Comprising an upper-layer heating plate and a lower-layer heating plate which are mechanically connected, and the end faces of the upper-layer heating plate and the lower-layer heating plate are tightly attached; a heating pipe mounting cavity is formed in the lower-layer heating plate, the heating pipe is embedded into the mounting cavity, and the heating area of the heating pipe is completely wrapped by the mounting cavity; a cooling pipeline is pre-embedded in the lower-layer heating plate, is embedded along a groove formed in the surface of the heating plate and is flush with the surface of the heating plate; a plurality of positioning clamping grooves for fixing welding workpieces are formed in the surface of the upper-layer heating plate, and thermocouple detection positions are uniformly distributed around the positioning clamping grooves; the heating pipe and the cooling pipeline are independently controlled, heat of the heating pipe is conducted to the upper heating plate through the lower heating plate, and the cooling pipeline is used for rapidly guiding out heat in a vacuum environment. Efficient heat conduction, uniform temperature field distribution and rapid heat dissipation are achieved, and the welding quality and the production efficiency are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum welding, and in particular to a heating plate structure for a vacuum eutectic furnace. Background Art

[0002] In modern industrial production, vacuum eutectic furnaces, as a crucial welding equipment, are widely used in electronics, aerospace, automotive manufacturing, and other fields, enabling high-precision, high-quality welding processes. By performing welding in a high-vacuum environment, these furnaces effectively avoid oxidation and contamination, thereby improving the strength and reliability of welded joints. However, the heating plate structure of existing vacuum eutectic furnaces presents several technical bottlenecks, limiting further improvements in their performance.

[0003] Traditional vacuum eutectic furnace heating plates usually adopt a single-layer structure, and the material is mostly a single aluminum profile, copper or ceramic. The heating efficiency of this heating plate is low. The main reason is that the heating tube is usually installed at the bottom of the heating plate. The heat is transferred to the heating plate through radiation, but only part of the heat is effectively absorbed, resulting in a slow heating rate and an uneven heating area. In addition, the heat dissipation performance of traditional heating plates is also poor. After welding is completed, the heat can only be transferred to the furnace body through slow thermal radiation for heat dissipation. The cooling time is long, which seriously affects the welding efficiency. Some welding processes require rapid cooling, but traditional heating plates cannot meet this requirement. At the same time, the material of traditional heating plates is difficult to achieve ideal uniformity in terms of thermal conductivity, thermal expansion coefficient and cooling process, resulting in a high welding void rate and unstable welding quality. These problems not only affect production efficiency, but also increase production costs, becoming a key factor restricting the development of vacuum eutectic furnace technology.

[0004] In view of the above problems, the present invention proposes a heating plate structure for a vacuum eutectic furnace. Summary of the Invention

[0005] The purpose of the present invention is to provide a heating plate structure for a vacuum eutectic furnace to solve the problems of uneven heating, slow cooling and high welding void rate caused by low heat radiation efficiency of traditional single-layer heating plates in a vacuum environment.

[0006] To achieve the above objectives, the following technical solutions are adopted.

[0007] A heating plate structure for a vacuum eutectic furnace, comprising: an upper heating plate and a lower heating plate for placing a workpiece, wherein the upper heating plate and the lower heating plate are mechanically connected and their end surfaces are tightly fitted;

[0008] The lower heating plate is provided with a mounting cavity for the heating tube, the heating tube is embedded in the mounting cavity, and the mounting cavity completely covers the heating area of ​​the heating tube, so that the heat of the heating tube is transferred to the upper heating plate through the lower heating plate;

[0009] A cooling pipe is also pre-buried inside the lower heating plate. The cooling pipe is grooved and embedded along the surface of the heating plate and is flush with the surface of the lower heating plate. The cooling pipe is used to quickly conduct heat in a vacuum environment.

[0010] Optionally, a plurality of positioning slots for fixing welding workpieces are provided on the surface of the upper heating plate, and thermocouple detection positions are evenly distributed around the positioning slots.

[0011] Optionally, a multi-layer heat insulation board is provided at the bottom of the lower heating plate.

[0012] Optionally, the layout path of the cooling pipe is serpentine or spiral, and the inner wall of the pipe is provided with a guide structure for enhancing turbulence, and the guide structure includes periodic protrusions or grooves.

[0013] Optionally, the bonding surface between the lower heating plate and the upper heating plate is provided with a high thermal conductivity interface layer, and the interface layer is a metal foil or a graphene coating, with a thickness less than 0.1 mm and a coverage area greater than 95% of the bonding surface.

[0014] Optionally, the inlet and outlet of the cooling pipe are connected to an external circulating cooling system, and an elastic sealing component is provided at the junction of the cooling pipe and the lower heating plate, and the sealing component includes a bellows structure or a memory alloy compensation ring.

[0015] Optionally, the lower heating plate is made of aluminum alloy, and the upper heating plate is made of graphite.

[0016] Optionally, a reflective baffle is provided on the top of the upper heating plate, and a reflective layer is provided on a side of the reflective baffle close to the upper heating plate for reflecting the emitted heat back to the upper heating plate.

[0017] Optionally, the heating plate structure further includes a temperature gradient control module, which dynamically adjusts the heating tube power and the flow rate of the cooling pipe according to real-time data of the thermocouple detection position, so that the temperature difference between each area of ​​the upper heating plate is less than ±2°C.

[0018] Optionally, the heating plate structure can be detachably integrated onto the lifting platform of the vacuum eutectic furnace, and a vibration suppression mechanism is provided at the bottom of the lifting platform. The vibration suppression mechanism includes an air-floating shock-absorbing layer or an electromagnetic damper, which is used to reduce mechanically transmitted thermal stress disturbances in a vacuum environment.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention proposes a double-layer heating plate structure, which significantly improves the heating efficiency and heat dissipation performance of the vacuum eutectic furnace. Specifically, a mounting cavity for the heating tube is provided in the lower heating plate, and the heat of the heating tube can be efficiently transferred to the upper heating plate through the lower heating plate, avoiding the problem of heat loss in traditional heating methods, thereby significantly accelerating the heating speed. At the same time, the pre-buried cooling pipe inside the lower heating plate can quickly conduct heat under a vacuum environment, effectively shortening the cooling time and meeting the process requirements of rapid cooling. This double-layer structural design not only improves the heating efficiency, but also optimizes the heat dissipation performance, significantly reduces the welding void rate, and improves the welding quality.

[0021] Furthermore, the performance of the heating plate has been optimized. For example, the design of the positioning slots and thermocouple detection points on the surface of the upper heating plate ensures more stable fixation of the welding workpiece and more accurate temperature monitoring, further improving the stability of welding quality. The multi-layer thermal insulation board installed at the bottom of the lower heating plate effectively reduces heat loss to the bottom and improves energy efficiency. The serpentine or spiral layout of the cooling pipe and the turbulent flow-enhancing diversion structure further enhance heat dissipation efficiency. The design of the high thermal conductivity interface layer reduces thermal resistance and ensures rapid heat conduction. The provision of elastic sealing components improves the reliability and stability of the cooling system. The combination of aluminum alloy and graphite fully utilizes the advantages of both materials, further optimizing the performance of the heating plate. The design of the reflective baffle reduces heat loss and improves energy efficiency. The provision of the temperature gradient control module enables precise control of the heating and cooling processes, ensuring temperature uniformity and stability. The detachable design of the heating plate structure and the provision of a vibration suppression mechanism improve the flexibility and stability of the equipment, further optimizing the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a heating plate structure for a vacuum eutectic furnace according to the present invention.

[0023] Explanation of the accompanying symbols: 1. Cooling pipe; 2. Heating pipe; 3. Lower heating plate; 4. Upper heating plate; 5. Thermocouple detection position. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0025] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0026] like Figure 1 As shown, the present invention relates to a heating plate structure for a vacuum eutectic furnace, which aims to improve the heating efficiency, heat dissipation performance and welding quality by optimizing the design of the heating plate, while meeting the process requirements of rapid cooling.

[0027] The heating plate structure of the present invention consists of an upper heating plate 4 and a lower heating plate 3, which are tightly fitted together through a mechanical connection. This double-layer structure design fully utilizes the advantages of different materials while solving many problems of traditional single-layer heating plates.

[0028] The lower heating plate 3 is made of 6063 aluminum alloy, a material with excellent thermal conductivity and a moderate thermal expansion coefficient, capable of maintaining stable structural performance even at high temperatures. A mounting cavity for the heating tube 2 is embedded within the lower heating plate 3, completely enclosing the heating area of ​​the heating tube 2. This design allows the heat generated by the heating tube 2 to be efficiently transferred to the lower heating plate 3, avoiding the heat loss problem associated with traditional heating methods and significantly improving heating efficiency.

[0029] A cooling pipe 1 is also pre-buried within the lower heating plate 3. This pipe is slotted and embedded along the surface of the heating plate and machined flush with it. The cooling pipe 1 can be arranged in a serpentine or spiral pattern. This design increases the contact area between the cooling water and the heating plate, further improving heat dissipation efficiency. Turbulence-enhancing flow-guiding structures, such as periodic protrusions or grooves, are also provided on the inner wall of the cooling pipe 1. These structures effectively enhance the turbulence of the cooling water and further improve heat exchange efficiency.

[0030] The upper heating plate 4 is made of graphite, which has excellent thermal conductivity and good thermal stability and can maintain stable performance at high temperatures. The surface of the upper heating plate 4 is provided with a plurality of positioning slots for fixing the welding workpiece. These positioning slots can be designed according to the shape and size of different workpieces to achieve a better fitting effect, thereby reducing the welding void rate. In addition, thermocouple detection positions 5 are evenly distributed around the positioning slots for real-time monitoring of the temperature distribution of the heating plate. Thermocouple detection positions 5 can be distributed at the four corners and the center area of ​​the upper heating plate 4, and the distance between each detection position and the positioning slot is equal. In this way, the accuracy and uniformity of temperature detection can be ensured. The thermocouple can feed back temperature data to the control system in real time through the wireless transmission module to accurately control the heating process.

[0031] In one embodiment of the present invention, the positioning slots of the upper heating plate 4 utilize a replaceable modular structure. Each positioning slot's interface with the workpiece is equipped with a self-adapting adapter, which can be secured within the slot via snap-fit ​​or magnetic attachment. This design allows the heating plate to accommodate workpieces of varying shapes and sizes, enhancing its versatility and flexibility. Furthermore, the adapter can be customized to meet the specific workpiece's requirements, further optimizing the welding effect.

[0032] To further improve heat transfer efficiency, a highly thermally conductive interface layer is applied to the mating surfaces of the lower heating plate 3 and the upper heating plate 4. This interface layer can be made of metal foil or graphene coating, with a thickness of less than 0.1 mm and a coverage area greater than 95% of the mating surface. This highly thermally conductive interface layer effectively reduces thermal resistance, ensuring rapid and uniform heat transfer from the lower heating plate 3 to the upper heating plate 4.

[0033] The inlet and outlet of cooling pipe 1 are connected to an external circulating cooling system. A resilient sealing component, such as a bellows structure or a memory alloy compensation ring, is installed at the junction between cooling pipe 1 and the lower heating plate 3. This sealing component effectively prevents cooling water leakage and adapts to dimensional changes during thermal expansion and contraction of the heating plate, ensuring the reliability and stability of the cooling system.

[0034] The inner wall of the cavity where the heating tube 2 is installed is provided with a reflective coating, which can be a multi-layer metal oxide composite film. This reflective coating can reflect the radiant heat of the heating tube 2 into the interior of the lower heating plate 3, further improving the utilization rate of heat and reducing heat loss.

[0035] The heating plate structure of the present invention also includes a temperature gradient control module. This module dynamically adjusts the power of the heating tube 2 and the flow rate of the cooling pipe 1 based on real-time data from the thermocouple detection station 5, ensuring that the temperature difference between different areas of the upper heating plate 4 is less than ±2°C. This temperature gradient control module ensures temperature uniformity of the heating plate during the welding process, thereby improving weld quality.

[0036] In practice, the temperature gradient control module uses a PID control algorithm to adjust the power of the heating tube 2 in real time based on the preset temperature curve and actual detected temperature data. Simultaneously, the flow rate of the cooling pipe 1 can be dynamically adjusted based on temperature feedback to ensure rapid heating, uniform heat preservation, and rapid cooling during the welding process.

[0037] The heating plate is removably integrated into the vacuum eutectic furnace's lifting platform, facilitating installation and maintenance while enhancing the equipment's flexibility. A vibration suppression mechanism, such as an air-floating damping layer or electromagnetic damper, is located at the bottom of the lifting platform. This vibration suppression reduces mechanically transmitted thermal stress disturbances in the vacuum environment, thereby improving the stability and reliability of the welding process.

[0038] Specifically, the air-floating shock-absorbing layer reduces vibrations generated by the lifting platform during movement through the elastic cushioning effect of the gas. The electromagnetic damper, through the principle of electromagnetic induction, suppresses the propagation of vibrations in real time. The combination of these two vibration suppression mechanisms effectively reduces thermal stress disturbances during welding, ensuring consistent welding quality.

[0039] A multi-layer insulation board is provided at the bottom of the lower heating plate 3. This insulation board can be made of insulation materials such as ceramic fiber, which can effectively reduce the downward transfer of heat, improve energy utilization efficiency, and protect the furnace structure from high temperature.

[0040] A reflective baffle is provided on the top of the upper heating plate 4, and a reflective layer is provided on the side of the reflective baffle close to the upper heating plate 4. This reflective layer can be made of a material such as a metal oxide coating, and its function is to reflect the emitted heat back to the upper heating plate 4, reducing heat loss and further improving heating efficiency.

[0041] In one embodiment of the present invention, the upper heating plate 4 and the lower heating plate 3 are secured together using highly heat-resistant bolts. Ceramic insulation pads are placed between the contact surfaces of the bolts and the heating plates to prevent heat from being conducted to the outside through the bolts. This design not only ensures a reliable connection but also reduces heat loss, improving heating efficiency.

[0042] In another specific embodiment of the present invention, the upper heating plate 4 and the lower heating plate 3 adopt a mortise and tenon locking structure. The gaps in the mortise and tenon structure are filled with thermal grease. This structure not only achieves a reliable connection, but also further improves the heat conduction efficiency, ensuring that heat can be quickly and evenly transferred from the lower heating plate 3 to the upper heating plate 4.

[0043] In one embodiment of the present invention, multiple layers of insulation panels are installed at the bottom of the lower heating plate 3. These panels, made of thermal insulation materials such as ceramic fiber, effectively reduce downward heat transfer, improve energy efficiency, and protect the furnace structure from high temperatures. The number of insulation panels can be adjusted according to actual needs to achieve optimal insulation.

[0044] In one embodiment of the present invention, a reflective baffle is positioned on top of the upper heating plate 4. A reflective layer, such as a metal oxide coating, is positioned on the side of the reflective baffle closest to the upper heating plate 4. This layer, which functions to reflect emitted heat back toward the upper heating plate 4, reduces heat loss, and further improves heating efficiency. The size and shape of the reflective baffle can be adjusted based on the specific design of the upper heating plate 4 to ensure optimal reflection.

[0045] In a specific embodiment of the present invention, the heating plate structure also includes a temperature gradient control module. This module dynamically adjusts the power of the heating tube 2 and the flow rate of the cooling pipe 1 according to the real-time data of the thermocouple detection position 5, so that the temperature difference between each area of ​​the upper heating plate 4 is less than ±2°C. This temperature gradient control module can ensure the temperature uniformity of the heating plate during the welding process, thereby improving the welding quality. In a specific implementation, the temperature gradient control module can adjust the power of the heating tube 2 in real time through the PID control algorithm according to the preset temperature curve and the actual detected temperature data. At the same time, the flow rate of the cooling pipe 1 can also be dynamically adjusted according to the temperature feedback to ensure the needs of rapid heating, uniform heat preservation and rapid cooling during the welding process.

[0046] In a specific embodiment of the present invention, the heating plate structure is detachably integrated on the lifting platform of the vacuum eutectic furnace, and a vibration suppression mechanism is provided at the bottom of the lifting platform. The vibration suppression mechanism includes an air-floating shock-absorbing layer or an electromagnetic damper. The combination of these two vibration suppression mechanisms can effectively reduce the thermal stress disturbance during the welding process and ensure the stability of the welding quality. Specifically, the air-floating shock-absorbing layer can reduce the vibration generated by the lifting platform during movement through the elastic buffering effect of the gas. The electromagnetic damper can suppress the propagation of vibration in real time through the principle of electromagnetic induction. The combination of these two vibration suppression mechanisms can effectively reduce the thermal stress disturbance during the welding process and ensure the stability of the welding quality.

[0047] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A heating plate structure for a vacuum eutectic furnace, characterized in that: include: An upper heating plate (4) and a lower heating plate (3) for placing workpieces, wherein the upper heating plate (4) and the lower heating plate (3) are mechanically connected and their end faces are tightly fitted; The lower heating plate (3) is provided with a mounting cavity for the heating tube (2), the heating tube (2) is embedded in the mounting cavity, and the mounting cavity completely covers the heating area of ​​the heating tube (2), so as to allow the heat of the heating tube (2) to be conducted to the upper heating plate (4) through the lower heating plate (3); A cooling pipe (1) is also pre-buried inside the lower heating plate (3), and the cooling pipe (1) is grooved and embedded along the surface of the heating plate and flush with the surface of the lower heating plate (3). The cooling pipe (1) is used to quickly conduct heat in a vacuum environment.

2. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: The surface of the upper heating plate (4) is provided with a plurality of positioning slots for fixing welding workpieces, and thermocouple detection positions (5) are evenly distributed around the positioning slots.

3. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: The bottom of the lower heating plate (3) is provided with multiple layers of heat insulation plates.

4. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: The layout path of the cooling pipe (1) is serpentine or spiral, and the inner wall of the pipe is provided with a flow-guiding structure for enhancing turbulence, wherein the flow-guiding structure comprises periodic protrusions or grooves.

5. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: The bonding surface of the lower heating plate (3) and the upper heating plate (4) is provided with a high thermal conductivity interface layer, and the interface layer is a metal foil or a graphene coating, the thickness of which is less than 0.1 mm and the coverage area is greater than 95% of the bonding surface.

6. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: The inlet and outlet of the cooling pipe (1) are connected to an external circulating cooling system, and an elastic sealing component is provided at the junction of the cooling pipe (1) and the lower heating plate (3), wherein the sealing component comprises a bellows structure or a memory alloy compensation ring.

7. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: The lower heating plate (3) is made of aluminum alloy, and the upper heating plate (4) is made of graphite.

8. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: A reflective baffle is provided on the top of the upper heating plate (4), and a reflective layer is provided on a side of the reflective baffle close to the upper heating plate (4) for reflecting the emitted heat back to the upper heating plate (4).

9. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that: The heating plate structure also includes a temperature gradient control module, which dynamically adjusts the power of the heating tube (2) and the flow rate of the cooling pipe (1) according to real-time data from the thermocouple detection position (5), so that the temperature difference between each area of ​​the upper heating plate (4) is less than ±2°C.

10. A heating plate structure for a vacuum eutectic furnace according to any one of claims 1 to 9, characterized in that: The heating plate structure can be detachably integrated onto the lifting platform of the vacuum eutectic furnace, and a vibration suppression mechanism is provided at the bottom of the lifting platform. The vibration suppression mechanism includes an air-floating shock-absorbing layer or an electromagnetic damper, which is used to reduce mechanically transmitted thermal stress disturbances in a vacuum environment.

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