A gradient composite plate strip diffusion annealing device and a working method thereof

Abstract

This application relates to the field of diffusion annealing technology for gradient composite strips and sheets, and in particular to a diffusion annealing apparatus and its working method for gradient composite strips and sheets. The apparatus includes a heating chamber, a temperature control module, a heat-conducting component, a drive mechanism, and a cooling system. The heating chamber adopts a double-layer structure, with embedded heating elements and an independent power adjustment unit to achieve precise temperature control. The heat-conducting component improves the uniformity of heat transfer through liquid metal circulation. The clamping device adapts to materials of different thicknesses and monitors the clamping force. The cooling system combines water cooling and air cooling for rapid cooling. This application can solve the problems of difficult temperature gradient control, uneven diffusion, insufficient interfacial bonding performance, and high energy consumption in the prior art, meeting the industrial production needs of high-performance gradient composite materials.

Description

Technical Field

[0001] This invention belongs to the field of materials processing and heat treatment technology, specifically a diffusion annealing device for gradient composite plate strips and its working method. Background Technology

[0002] With the widespread application of metal composite materials in industry, diffusion annealing of gradient composite strips and sheets has gradually become a research hotspot. However, existing diffusion annealing equipment and methods still have some shortcomings when processing gradient composite strips and sheets, affecting the uniformity of material properties and production efficiency.

[0003] A search revealed an annealing furnace and method for titanium rods and titanium alloy rods, published on October 13, 2023, with publication number CN115491622B. This patent achieves equidistant heating of the rods and heating source by setting up a rod placement rack and heating device, improving the uniformity of annealing effects on multiple rods. It also reduces the oxygen content in the furnace by using a CaH2 dispersion device, minimizing its impact on material properties. However, this technical solution primarily focuses on rod design and does not consider the special structural requirements of gradient composite strips and plates. Its heating method makes it difficult to control the temperature gradient along the thickness direction of the strip or plate, potentially leading to uneven diffusion and affecting the interfacial bonding performance of the composite material. Furthermore, the single-furnace processing capacity of this device is limited, making it difficult to meet the needs of large-scale industrial production.

[0004] A search revealed an annealing apparatus with publication number CN111312624B, published on March 10, 2023. This patent achieves temperature uniformity within the annealing chamber through multiple arrayed heating pipes and an independent temperature control system, thus improving the annealing quality of the substrate. However, this technical solution is mainly suitable for annealing planar substrates and has poor adaptability to the complex structures of gradient composite strips. The design of its heating pipes makes it difficult to precisely control the diffusion process within the strip, potentially leading to uneven stress distribution within the material and affecting the mechanical properties and stability of the final product. Furthermore, the apparatus has high energy consumption and lacks dedicated annealing process optimizations tailored to the characteristics of gradient composite materials.

[0005] The aforementioned problems indicate that existing annealing apparatuses and methods still have certain shortcomings in terms of temperature gradient control, diffusion uniformity, material interfacial bonding performance, and energy consumption optimization when processing gradient composite strips and plates. Therefore, this invention provides a diffusion annealing apparatus and its operating method for gradient composite strips and plates, aiming to achieve precise temperature control along the thickness direction of the gradient composite strips and plates, optimize the uniformity of the diffusion process, improve the material interfacial bonding performance, and reduce energy consumption, thereby meeting the demands of modern industry for high-performance gradient composite materials. Summary of the Invention

[0006] The present invention addresses the problem of providing a diffusion annealing apparatus and its operating method for gradient composite strips, solving the technical problems of difficulty in achieving precise temperature control in the thickness direction, uneven diffusion process, insufficient interfacial bonding performance, and high energy consumption in the processing of gradient composite strips. Existing diffusion annealing apparatuses and methods have significant shortcomings in meeting the complex structural requirements of gradient composite strips. For example, the heating method is difficult to meet the temperature gradient requirements in the thickness direction, which may lead to uneven diffusion process and thus affect the interfacial bonding performance of the material. At the same time, the single furnace processing capacity is limited and the energy consumption is high, making it difficult to meet the needs of large-scale industrial production.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A diffusion annealing apparatus for gradient composite strip includes a heating chamber, a temperature control module, a heat-conducting component, a drive mechanism, and a cooling system. The heating chamber has a double-layer structure: the outer layer is made of high-temperature resistant insulating material, and the inner layer is made of a high thermal conductivity metal material. Several embedded heating elements are disposed on the surface of the inner layer, and these elements are fixed to the inner wall with bolts and electrically connected to the temperature control module. The temperature control module is installed outside the heating chamber and integrates multiple independent temperature sensors and power adjustment units. Each power adjustment unit corresponds to one heating element and is used to monitor and adjust the output power of the heating element in real time. The heat-conducting component is located inside the heating chamber and consists of multiple detachable heat-conducting plates. Each heat-conducting plate is mounted on the inner wall of the heating chamber via a slide rail, and the heat-conducting plates are connected by flexible heat-conducting pads to ensure continuous heat transfer. The drive mechanism includes a stepper motor and a drive shaft. The stepper motor is mounted on the top of the heating chamber, and the drive shaft passes through the heating chamber and is connected to the output end of the stepper motor via a coupling. A clamping device is installed at the bottom of the drive shaft for fixing the gradient composite strip. The cooling system includes a circulating water cooling pipeline and an air cooling module. The circulating water cooling pipeline is arranged around the outer wall of the heating chamber, and the air cooling module is installed at the bottom of the heating chamber, using a fan to expel excess heat from the chamber.

[0008] Each heat-conducting plate in the heat-conducting assembly has several parallel heat-conducting channels filled with liquid metal with a high thermal conductivity. The liquid metal is circulated by a micro-pump to enhance the heat transfer efficiency of the heat-conducting plate. Temperature sensing points are set on the surface of the heat-conducting plate, and these points are connected to a temperature control module via signal lines to collect real-time temperature data of the heat-conducting plate surface.

[0009] The temperature control module also includes a central processing unit (CPU). The CPU analyzes the collected temperature data using algorithms and generates control commands based on a preset temperature gradient curve. These commands adjust the output power of the heating element via a power regulation unit, thereby achieving precise control of the temperature distribution within the heating chamber. The temperature control module is also equipped with a display panel for real-time display of the temperature distribution within the heating chamber.

[0010] The clamping device includes a fixed clamping plate and a movable clamping plate. The fixed clamping plate is bolted to the bottom of the drive shaft, and the movable clamping plate is mounted on one side of the fixed clamping plate via a slide groove. A spring is installed in the slide groove, with one end of the spring connected to the movable clamping plate and the other end connected to the fixed clamping plate. The movable clamping plate is adjusted in position via a manual knob to accommodate gradient composite strips of different thicknesses. A pressure sensor is installed at the bottom of the clamping device, and the pressure sensor is connected to the central processing unit via a signal line to monitor the clamping force.

[0011] The cooling system's circulating water cooling piping includes an inlet pipe and an outlet pipe. The inlet pipe connects to an external water source, and the outlet pipe connects to a wastewater recovery device. Flow meters and temperature sensors are installed within the circulating water cooling piping, connected to the central processing unit (CPU) via signal lines to monitor the cooling water flow and temperature. The air-cooled module includes multiple fans, each equipped with an independent speed controller. These speed controllers, connected to the CPU via signal lines, adjust the fan speed based on temperature changes within the heating chamber.

[0012] A method for operating a diffusion annealing apparatus for gradient composite strip materials, the specific operating steps of which are as follows: Step 1: Place the gradient composite strip in the clamping device, and adjust the position of the movable clamping plate by manually turning the knob to make the fixed clamping plate and the movable clamping plate tightly clamp the gradient composite strip. The pressure sensor monitors the clamping force in real time and transmits the data to the central processing unit to ensure that the clamping force is appropriate.

[0013] Step Two: The heating element inside the heating chamber is activated. The temperature control module generates control commands based on the preset temperature gradient curve and adjusts the output power of the heating element through the power regulation unit to create the desired temperature distribution within the heating chamber. The heat-conducting plate in the heat-conducting assembly circulates liquid metal within the heat-conducting channels, uniformly transferring heat to the surface of the gradient composite strip. Temperature sensing points collect real-time temperature data from the surface of the heat-conducting plate and transmit the data to the central processing unit.

[0014] Step 3: Start the drive mechanism. The stepper motor drives the transmission shaft to rotate, causing the gradient composite strip in the clamping device to rotate slowly within the heating chamber, ensuring uniform heating of all parts of the gradient composite strip. The central processing unit dynamically adjusts the output power of the heating element based on data collected from the temperature sensing points to maintain a stable temperature distribution within the heating chamber.

[0015] Step 4: After the heating process is complete, the cooling system is activated. Cooling water in the circulating water-cooling pipeline flows in through the inlet pipe, absorbs heat from the outer wall of the heating chamber, and then exits through the outlet pipe. Flow meters and temperature sensors monitor the flow rate and temperature of the cooling water in real time and transmit the data to the central processing unit. The fan of the air-cooling module adjusts its speed according to the temperature changes inside the heating chamber to expel excess heat until the gradient composite strip is cooled to room temperature.

[0016] The beneficial effects of this invention are as follows: The dual-layer heating chamber design, through embedded heating elements and an independent power adjustment unit, enables precise control of the temperature distribution within the heating chamber, meeting the temperature gradient requirements along the thickness direction of the gradient composite strip. The heat-conducting plate in the heat-conducting assembly, through the circulating flow of liquid metal within the heat-conducting channels, significantly improves the uniformity and efficiency of heat transfer, avoiding the uneven diffusion process problems caused by traditional heating methods. The clamping device, through the cooperation of fixed and movable clamping plates, can adapt to gradient composite strips of different thicknesses, while a pressure sensor monitors the clamping force in real time, ensuring a safe and reliable clamping process. The cooling system, through the coordinated operation of circulating water cooling pipes and an air-cooling module, rapidly reduces the temperature within the heating chamber, shortens cooling time, and improves production efficiency. Through four core innovations—precise temperature control, efficient heat conduction, intelligent clamping, and rapid cooling—this invention overcomes the shortcomings of existing diffusion annealing devices in terms of temperature gradient control, diffusion uniformity, interfacial bonding performance, and energy consumption optimization, meeting the demands of modern industry for high-performance gradient composite materials. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the gradient composite plate and strip diffusion annealing device of the present invention.

[0018] Figure 2 This is a bottom-view three-dimensional structural diagram of the gradient composite plate and strip diffusion annealing device of the present invention.

[0019] Figure 3 This is a side view sectional view of the gradient composite plate and strip diffusion annealing device of the present invention.

[0020] Figure 4 This is a front view sectional view of the gradient composite plate and strip diffusion annealing device of the present invention.

[0021] The attached diagram is labeled as follows: 1. Heating cavity; 2. Temperature control module; 3. Heat conduction component; 4. Drive mechanism; 5. Cooling system; 6. Embedded heating element; 7. Heat conduction plate; 8. Heat conduction channel; 9. Flexible heat conduction pad; 10. Fixed clamp; 11. Movable clamp; 12. Spring; 13. Pressure sensor; 14. Circulating water cooling pipeline; 15. Air cooling module; 16. Central processing unit. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Specific implementation examples are given below.

[0024] This invention provides a diffusion annealing apparatus for gradient composite strips and its operating method. The specific embodiments of this invention are described in detail below with reference to the accompanying drawings. Figure 1-4 As shown, the device includes a heating chamber 1, a temperature control module 2, a heat conduction component 3, a drive mechanism 4, and a cooling system 5. These components, through a reasonable layout and connection, jointly achieve precise temperature control and efficient diffusion annealing treatment of the gradient composite strip.

[0025] The heating cavity 1 adopts a double-layer structure design. The outer layer is made of high-temperature resistant heat-insulating material, and the inner layer is made of high thermal conductivity metal material. This double-layer structure can effectively reduce heat loss and improve heat conduction efficiency. Embedded heating elements 6 are fixed to the inner wall of the heating cavity 1 with bolts. Their position and number are arranged according to actual needs to ensure uniform temperature distribution within the heating cavity. The embedded heating elements 6 are electrically connected to the temperature control module 2, which is installed outside the heating cavity 1 and is used to monitor and adjust the output power of the heating elements 6 in real time. The cross-sectional structure of the heating cavity 1 clearly shows the double-layer design and the installation method of the embedded heating elements 6. The embedded heating elements 6 are connected to the temperature control module 2 via wires, forming a complete circuit loop.

[0026] The heat-conducting component 3 is located inside the heating cavity 1 and consists of multiple detachable heat-conducting plates 7. Each heat-conducting plate 7 is mounted on the inner wall of the heating cavity 1 via a slide rail. The heat-conducting plates 7 are connected by flexible heat-conducting pads 9, which ensure the continuity of heat transfer and accommodate minor displacements between the heat-conducting plates 7. Several parallel heat-conducting channels 8 are formed inside the heat-conducting plates 7. These channels 8 are filled with liquid metal with a high thermal conductivity, which circulates through a micro-pump, significantly improving the heat transfer efficiency of the heat-conducting plates 7. Temperature sensing points are set on the surface of the heat-conducting plates 7, and these points are connected to the temperature control module 2 via signal lines to collect real-time temperature data of the surface of the heat-conducting plates 7. The design of the heat-conducting component 3 allows heat to be uniformly transferred to the surface of the gradient composite strip, avoiding the uneven diffusion problem caused by traditional heating methods.

[0027] The drive mechanism 4 includes a stepper motor and a drive shaft. The stepper motor is mounted on the top of the heating chamber 1, and the drive shaft passes through the heating chamber 1 and is connected to the output end of the stepper motor via a coupling. A clamping device is installed at the bottom of the drive shaft. The clamping device includes a fixed clamping plate 10 and a movable clamping plate 11. The fixed clamping plate 10 is fixed to the bottom of the drive shaft with bolts. The movable clamping plate 11 is installed on one side of the fixed clamping plate 10 via a slide groove. A spring 12 is installed in the slide groove, with one end of the spring 12 connected to the movable clamping plate 11 and the other end connected to the fixed clamping plate 10. The movable clamping plate 11 can be adjusted in position by a manual knob to accommodate gradient composite strips of different thicknesses. A pressure sensor 13 is installed at the bottom of the clamping device. The pressure sensor 13 is connected to the central processing unit 16 via a signal line to monitor the clamping force. The structural design of the clamping device allows the fixed clamping plate 10 and the movable clamping plate 11 to tightly clamp the gradient composite strip, while the pressure sensor 13 monitors the clamping force in real time to ensure a safe and reliable clamping process.

[0028] The cooling system 5 includes a circulating water cooling pipeline 14 and an air-cooling module 15. The circulating water cooling pipeline 14 is arranged around the outer wall of the heating chamber 1, and the air-cooling module 15 is installed at the bottom of the heating chamber 1, using fans to dissipate excess heat from the chamber. The circulating water cooling pipeline 14 includes an inlet pipe and an outlet pipe. The inlet pipe is connected to an external water source, and the outlet pipe is connected to a wastewater recovery device. A flow meter and a temperature sensor are installed inside the circulating water cooling pipeline 14. The flow meter and temperature sensor are connected to the central processing unit 16 via signal lines to monitor the flow rate and temperature of the cooling water. The air-cooling module 15 includes multiple fans, each equipped with an independent speed controller. The speed controller is connected to the central processing unit 16 via a signal line to adjust the fan speed according to temperature changes within the heating chamber 1. This arrangement of the cooling system allows the circulating water cooling pipeline 14 and the air-cooling module 15 to work together, rapidly reducing the temperature within the heating chamber 1, shortening cooling time, and improving production efficiency.

[0029] The temperature control module 2 integrates multiple independent temperature sensors and power regulation units. Each power regulation unit corresponds to an embedded heating element 6, used to monitor and adjust the output power of the embedded heating element 6 in real time. The temperature control module 2 also includes a central processing unit 16. The central processing unit 16 analyzes the collected temperature data using algorithms and generates control commands based on a preset temperature gradient curve. These control commands adjust the output power of the embedded heating element 6 through the power regulation units, thereby achieving precise control of the temperature distribution within the heating cavity 1. The temperature control module 2 is also equipped with a display panel for displaying the temperature distribution within the heating cavity 1 in real time. The block diagram of the working principle of the temperature control module 2 clearly illustrates the signal transmission and control logic between the temperature sensors, power regulation units, and the central processing unit 16.

[0030] In actual operation, the gradient composite strip is first placed in the clamping device. The position of the movable clamping plate 11 is adjusted by manually turning the knob, so that the fixed clamping plate 10 and the movable clamping plate 11 tightly clamp the gradient composite strip. The pressure sensor 13 monitors the clamping force in real time and transmits the data to the central processing unit 16 to ensure that the clamping force is moderate. Then, the embedded heating element 6 in the heating chamber 1 is activated. The temperature control module 2 generates control commands according to the preset temperature gradient curve and adjusts the output power of the embedded heating element 6 through the power adjustment unit to form the required temperature distribution in the heating chamber 1. The heat conduction plate 7 in the heat conduction component 3 circulates liquid metal in the heat conduction channel 8 to evenly transfer heat to the surface of the gradient composite strip. The temperature sensing point collects the temperature data of the surface of the heat conduction plate 7 in real time and transmits the data to the central processing unit 16. Then, the drive mechanism 4 is activated. The stepper motor drives the drive shaft to rotate, so that the gradient composite strip in the clamping device rotates slowly in the heating chamber 1 to ensure that all parts of the gradient composite strip are heated evenly. The central processing unit 16 dynamically adjusts the output power of the embedded heating element 6 based on data collected from the temperature sensing points to maintain a stable temperature distribution within the heating cavity 1. Once the heating process is complete, the cooling system 5 is activated. Cooling water from the circulating water cooling pipe 14 flows in through the inlet pipe, absorbs heat from the outer wall of the heating cavity 1, and is then discharged through the outlet pipe. Flow meters and temperature sensors monitor the flow rate and temperature of the cooling water in real time and transmit the data to the central processing unit 16. The fan of the air-cooling module 15 adjusts its speed according to temperature changes within the heating cavity 1, dissipating excess heat until the gradient composite strip cools to room temperature.

[0031] In the above embodiments, the double-layer structure design of the heating chamber 1 achieves precise control of the temperature distribution within the heating chamber 1 through the embedded heating element 6 and an independent power adjustment unit, meeting the temperature gradient requirements in the thickness direction of the gradient composite strip. The heat-conducting plate 7 in the heat-conducting assembly 3, through the circulating flow of liquid metal within the heat-conducting channel 8, significantly improves the uniformity and efficiency of heat transfer. The clamping device, through the cooperation of the fixed clamping plate 10 and the movable clamping plate 11, can adapt to gradient composite strips of different thicknesses, while the pressure sensor 13 monitors the clamping force in real time to ensure a safe and reliable clamping process. The cooling system 5, through the coordinated operation of the circulating water cooling pipeline 14 and the air cooling module 15, rapidly reduces the temperature within the heating chamber 1, shortens cooling time, and improves production efficiency. Through four core innovations—precise temperature control, efficient heat conduction, intelligent clamping, and rapid cooling—the shortcomings of existing diffusion annealing devices in terms of temperature gradient control, diffusion uniformity, interface bonding performance, and energy consumption optimization are solved, meeting the demands of modern industry for high-performance gradient composite materials. To enable those skilled in the art to fully understand and implement this invention, the specific implementation principle of this invention is further explained below in conjunction with a specific application scenario.

[0032] In actual industrial production, the diffusion annealing treatment of gradient composite strips requires precise temperature control in the thickness direction and uniform heat transfer. First, the gradient composite strip to be treated is placed in a clamping device. The position of the movable clamping plate 11 is adjusted manually using a knob to ensure it tightly clamps the gradient composite strip against the fixed clamping plate 10. At this time, the spring 12 in the slide provides appropriate elastic support, ensuring moderate and stable clamping force. The pressure sensor 13 monitors the clamping force in real time and transmits the data to the central processing unit 16 for analysis and feedback, thereby avoiding material deformation or loosening caused by excessive or insufficient clamping force.

[0033] Subsequently, the embedded heating elements 6 within the heating chamber 1 are activated. The embedded heating elements 6 are bolted to the inner wall of the heating chamber, and their positions are optimized to ensure uniform heat distribution. The temperature control module 2 generates control commands based on a preset temperature gradient curve, and the power adjustment unit adjusts the output power of each embedded heating element 6 according to the commands, thereby creating the desired temperature distribution within the heating chamber 1. This independently controlled design enables precise temperature gradient control of the heating chamber 1 along its thickness, meeting the specific requirements of gradient composite strip materials.

[0034] In the heat-conducting assembly 3, the heat-conducting plate 7 circulates liquid metal within the heat-conducting channel 8, efficiently transferring heat to the surface of the gradient composite strip. Driven by a micro-pump, the liquid metal continuously circulates within the heat-conducting channel 8, significantly improving the heat conduction efficiency of the heat-conducting plate 7. Flexible heat-conducting pads 9 connect adjacent heat-conducting plates 7, ensuring continuous heat transfer and accommodating minor displacements between the plates, preventing stress concentration caused by thermal expansion. Temperature sensing points on the surface of the heat-conducting plate 7 collect temperature data in real time and transmit it to the temperature control module 2. The central processing unit 16 dynamically adjusts the output power of the embedded heating element 6 based on this data to maintain a stable temperature distribution within the heating cavity 1.

[0035] Next, the drive mechanism 4 is activated, and the stepper motor drives the transmission shaft to rotate, causing the gradient composite strip in the clamping device to slowly rotate within the heating chamber 1. This rotational design ensures uniform heating of all parts of the gradient composite strip, avoiding localized overheating or insufficient heating. Simultaneously, the central processing unit 16 continuously optimizes the power output of the heating element 6 based on data collected from the temperature sensing points, further improving the accuracy and stability of the temperature distribution.

[0036] Once the heating process is complete, the cooling system 5 is activated. Cooling water in the circulating water-cooled pipe 14 flows in through the inlet pipe, absorbs heat from the outer wall of the heating chamber 1, and is then discharged through the outlet pipe. Flow meters and temperature sensors monitor the flow rate and temperature of the cooling water in real time and transmit the data to the central processing unit 16 so that cooling parameters can be adjusted according to actual conditions. The fan of the air-cooled module 15 adjusts its speed according to the temperature changes inside the heating chamber 1, quickly dissipating excess heat from the chamber. This combination of water cooling and air cooling significantly shortens cooling time, improves production efficiency, and reduces energy consumption.

[0037] Through the above steps, this invention achieves precise temperature control along the thickness direction of the gradient composite strip, optimizes the uniformity of the diffusion process, and significantly improves the interfacial bonding performance. The double-layer heating chamber 1 effectively reduces heat loss, the circulating flow of liquid metal in the heat-conducting component 3 significantly improves heat transfer efficiency, the intelligent design of the clamping device ensures operational safety and reliability, and the coordinated operation of the cooling system greatly reduces energy consumption and shortens the process cycle. These innovative designs collectively address the shortcomings of existing diffusion annealing devices in terms of temperature gradient control, diffusion uniformity, interfacial bonding performance, and energy consumption optimization, meeting the demands of modern industry for high-performance gradient composite materials.

[0038] All content not described in detail in this specification is prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are not shown in the figures because they are prior art, and will not be described further here.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A diffusion annealing apparatus for gradient composite strips, characterized in that, The system includes a heating cavity (1), a temperature control module (2), a heat-conducting component (3), a drive mechanism (4), and a cooling system (5). The heating cavity (1) has a double-layer structure, with the outer layer made of high-temperature resistant heat-insulating material and the inner layer made of high thermal conductivity metal material. Several embedded heating elements (6) are provided on the surface of the inner layer. The embedded heating elements (6) are fixed to the inner wall by bolts and electrically connected to the temperature control module (2). The temperature control module (2) is installed outside the heating cavity (1) and integrates multiple independent temperature sensors and power adjustment units. Each power adjustment unit corresponds to one embedded heating element (6). The heat-conducting component (3) is located in the heating cavity (1). Inside the heating cavity (1), there are multiple detachable heat-conducting plates (7). Each heat-conducting plate (7) is installed on the inner wall of the heating cavity (1) via a slide rail. The heat-conducting plates (7) are connected to each other by flexible heat-conducting pads (9). The driving mechanism (4) includes a stepper motor and a drive shaft. The stepper motor is installed on the top of the heating cavity (1). The drive shaft passes through the heating cavity (1) and is connected to the output end of the stepper motor via a coupling. A clamping device is installed at the bottom of the drive shaft. The cooling system (5) includes a circulating water cooling pipe (14) and an air cooling module (15). The circulating water cooling pipe (14) is arranged around the outer wall of the heating cavity (1). The air cooling module (15) is installed at the bottom of the heating cavity (1).

2. The gradient composite strip diffusion annealing apparatus according to claim 1, characterized in that, The heat-conducting plate (7) has several parallel heat-conducting channels (8) inside. The heat-conducting channels (8) are filled with liquid metal with high thermal conductivity. The liquid metal is circulated by a micro pump. Temperature sensing points are set on the surface of the heat-conducting plate (7). The temperature sensing points are connected to the temperature control module (2) through signal lines.

3. The gradient composite strip diffusion annealing apparatus according to claim 1, characterized in that, The temperature control module (2) also includes a central processing unit (16). The central processing unit (16) analyzes the collected temperature data through an algorithm and generates control commands according to the preset temperature gradient curve. The control commands adjust the output power of the embedded heating element (6) through the power adjustment unit.

4. The diffusion annealing apparatus for gradient composite strips according to claim 1, characterized in that, The clamping device includes a fixed clamping plate (10) and a movable clamping plate (11). The fixed clamping plate (10) is fixed to the bottom of the drive shaft by bolts. The movable clamping plate (11) is installed on one side of the fixed clamping plate (10) through a slide groove. A spring (12) is provided in the slide groove. One end of the spring (12) is connected to the movable clamping plate (11) and the other end is connected to the fixed clamping plate (10). The position of the movable clamping plate (11) is adjusted by a manual knob. A pressure sensor (13) is provided at the bottom of the clamping device. The pressure sensor (13) is connected to the central processing unit (16) through a signal line.

5. The diffusion annealing apparatus for gradient composite strips according to claim 1, characterized in that, The circulating water cooling pipeline (14) includes an inlet pipe and an outlet pipe. The inlet pipe is connected to an external water source, and the outlet pipe is connected to a wastewater recycling device. A flow meter and a temperature sensor are installed inside the circulating water cooling pipeline (14). The flow meter and temperature sensor are connected to the central processing unit (16) through signal lines.

6. The diffusion annealing apparatus for gradient composite strips according to claim 1, characterized in that, The air-cooled module (15) includes multiple fans, each equipped with an independent speed controller, which is connected to the central processing unit (16) via a signal line.

7. The diffusion annealing apparatus for gradient composite strips according to claim 1, characterized in that, The temperature control module (2) is also equipped with a display panel for real-time display of the temperature distribution inside the heating cavity (1).

8. The operating method of the gradient composite strip diffusion annealing apparatus according to any one of claims 1 to 7, characterized in that, The specific operation steps of this working method are as follows: Step 1: Place the gradient composite strip in the clamping device, and adjust the position of the movable clamping plate (11) by manually turning the knob so that the fixed clamping plate (10) and the movable clamping plate (11) tightly clamp the gradient composite strip. The pressure sensor (13) monitors the clamping force in real time and transmits the data to the central processing unit (16); Step 2: Start the embedded heating element (6), and the temperature control module (2) generates control commands according to the preset temperature gradient curve. The output power of the embedded heating element (6) is adjusted by the power adjustment unit. The heat conduction plate (7) in the heat conduction component (3) transfers heat to the surface of the gradient composite strip through the liquid metal circulation in the heat conduction channel (8). The temperature sensing point Real-time acquisition of temperature data on the surface of the heat-conducting plate (7) and transmission of the data to the central processing unit (16); Step 3: Start the drive mechanism (4), the stepper motor drives the transmission shaft to rotate so that the gradient composite strip in the clamping device rotates slowly in the heating cavity (1), and the central processing unit (16) dynamically adjusts the output power of the embedded heating element (6) according to the data collected by the temperature sensing point; Step 4: When the heating process is completed, start the cooling system (5), the cooling water in the circulating water cooling pipe (14) flows into the water inlet pipe to absorb the heat of the outer wall of the heating cavity (1) and is discharged from the water outlet pipe, and the fan of the air cooling module (15) adjusts the speed according to the temperature change in the heating cavity (1) until the gradient composite strip is cooled to room temperature.

9. The working method of the gradient composite plate and strip diffusion annealing device according to claim 8, characterized in that, In step two, the temperature control module (2) generates control instructions through the central processing unit (16) to achieve precise control of the temperature distribution inside the heating cavity (1).

10. The working method of the gradient composite plate and strip diffusion annealing device according to claim 8, characterized in that, In step four, the flow meter and temperature sensor in the circulating water cooling pipeline (14) monitor the flow rate and temperature of the cooling water in real time and transmit the data to the central processing unit (16).

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