Quenching furnace for small parts special for watches

Abstract

The invention relates to the field of heat treatment of parts, in particular to a quenching furnace for small parts special for watches. The device comprises a furnace body assembly, an oxygen isolation assembly, a heating assembly, a cooling assembly and a part bearing assembly, wherein the furnace body assembly comprises a main furnace body and other parts to form a specific structure; the oxygen isolation assembly isolates oxygen through an exhaust pipeline and the like. The heating assembly increases the temperature in the exhaust pipeline; the cooling assembly is cooled by quenching cooling oil; the part bearing assembly is used for bearing a to-be-quenched part. The heating assembly is provided with a heating resistor and the like, the temperature is accurately controlled through a temperature controller and the like, and all parts of the equipment have specific size and material selection requirements. According to the quenching device, the effects of effectively quenching the small parts special for the watches, ensuring the quenching quality of the parts, improving the production efficiency and prolonging the service life of equipment by reasonably designing the structure of the furnace body, accurately controlling the temperature, effectively isolating oxygen and the like are achieved.

Description

Technical Field

[0001] This application relates to the field of heat treatment of parts, and in particular to a quenching furnace for tiny parts used in watches. Background Technology

[0002] In the field of metal heat treatment equipment technology, quenching is crucial for improving the hardness and performance of metal parts. With the continuous development of the watch industry, the performance requirements for specialized micro-components in watches are also increasing. These micro-components have precise structures, and their hardness and other properties directly affect the quality and lifespan of watches. Therefore, the research and development of quenching processes and equipment for specialized micro-components in watches is of great significance and plays a key role in improving the quality and market competitiveness of watches. By continuously improving quenching equipment and processes, we can better meet the watch industry's demand for high-quality micro-components, driving the watch industry towards higher precision and higher quality.

[0003] In related technologies, general-purpose quenching furnaces are a common solution for quenching metal parts. To ensure quenching effectiveness, mechanical vacuum pumps are typically used to remove oxygen and prevent oxidation and decarburization. For heating, heating elements of varying power and specifications are selected to raise the temperature, and a complex temperature control system is used to maintain a stable quenching temperature. In the cooling stage, various types of cooling oil baths and cooling media are used to achieve rapid cooling of the parts. However, these conventional methods often lack specific design for particular materials and small-sized parts, resulting in numerous limitations in practical applications.

[0004] General-purpose quenching furnaces suffer from poor adaptability, making it difficult to precisely match the material and size requirements of the tiny components used in watchmaking. Regarding oxygen isolation, the use of mechanical vacuum pumps results in complex equipment structures, inconvenient operation, and high costs. The heating process is unstable, making it difficult to maintain a stable quenching temperature within a suitable range, leading to poor heat preservation and uneven internal temperatures in the parts, thus affecting quenching quality. Furthermore, these devices are not user-friendly and fail to adequately meet the economic and convenience requirements of self-made equipment. Summary of the Invention

[0005] To overcome the aforementioned technical problems, this application provides a quenching furnace for tiny parts specifically designed for watches.

[0006] The quenching furnace for micro-parts used in watches provided in this application adopts the following technical solution: A quenching furnace for micro-parts used in watches includes a furnace body assembly. The furnace body assembly includes a main furnace body, an insulation layer, a furnace liner, and a furnace cover plate. The main furnace body, the insulation layer, and the furnace liner are all constructed as horizontal cylindrical structures. The furnace cover plate is respectively located at both ends of the main furnace body. The outer diameter of the insulation layer matches the inner diameter of the main furnace body, and the outer diameter of the furnace liner matches the inner diameter of the insulation layer. Refractory bricks that match the furnace cover plate are provided at both ends of the furnace liner, and the outer diameter of the refractory bricks matches the inner diameter of the insulation layer. An oxygen isolation assembly includes an exhaust pipe, a fuel storage tank connected to one end of the exhaust pipe, and a control valve. The exhaust pipe is coaxially arranged with the furnace shell, and a portion of the exhaust pipe is located inside the furnace shell. The outer diameter of the exhaust pipe matches the inner diameter of the refractory brick. The space between the outer diameter of the exhaust pipe and the inner diameter of the furnace shell forms a heating chamber. The control valve is located at the outlet of the fuel storage tank. A heating assembly, disposed within the heating chamber, is used to increase the temperature inside the exhaust pipe; The cooling assembly includes a cooling oil tank containing quenching cooling oil, and a discharge chute is provided at the bottom of the exhaust pipe away from the fuel storage tank. The bottom of the discharge chute is submerged below the liquid level of the quenching cooling oil. A part-carrying assembly includes an arc-shaped shovel for holding the part to be quenched, the arc-shaped shovel being used to carry the part to be quenched into the exhaust pipe, and the arc-shaped shovel having a heat-insulated handle.

[0007] By adopting the above technical solutions, the horizontal cylindrical main furnace body, insulation layer, and furnace liner are combined, and refractory bricks are used in conjunction with the furnace cover plate to effectively ensure the structural stability and sealing of the furnace body, reduce heat loss, and make the temperature inside the heating chamber more uniform and stable. The oxygen isolation component is connected to the fuel storage tank through the exhaust pipe and controlled by the control valve. It can isolate air by consuming air through combustion and fuel vaporization, avoiding oxidation and decarburization of parts during quenching. The heating component is located inside the heating chamber, which can effectively increase the temperature inside the exhaust pipe and provide suitable high-temperature conditions for quenching parts. The bottom of the cooling component's feeding trough is submerged below the quenching cooling oil surface, which allows parts falling from the exhaust pipe to quickly enter the cooling oil under the premise of isolating air, achieving rapid cooling and ensuring the hardness and performance of the parts after quenching. The arc-shaped shovel with a heat-insulated handle can conveniently and safely send the parts to be quenched into the exhaust pipe, avoiding burns to the operator, while ensuring that the parts can accurately reach the quenching position.

[0008] Optionally, the heating assembly includes two heating resistors connected to the furnace chamber. The heating resistors are located at the center of the heating cavity and are symmetrically offset relative to the central axis of the furnace chamber. The heating resistors are electrically connected to an external power source.

[0009] By adopting the above technical solution, the two heating resistors are set in the center of the heating chamber and are symmetrically staggered relative to the central axis of the furnace. This layout can make the heating more uniform and the temperature inside the furnace rise evenly. The electrical connection with an external power source can ensure that the heating resistors can stably obtain electrical energy to achieve the heating function, so that the quenching furnace can efficiently and stably heat up to the appropriate quenching temperature quickly, thereby ensuring the quenching quality of the micro parts for watches.

[0010] Optionally, the heating assembly further includes a thermocouple, a temperature controller, and a solid-state relay. The thermocouple is fixedly connected to the furnace cover plate, and the probe of the thermocouple is located inside the heating cavity. The temperature controller is electrically connected to an external power source and is signal-connected to the thermocouple. The control circuit of the temperature controller is signal-connected to the input circuit of the solid-state relay, and the output circuit of the solid-state relay is connected in series between the heating resistor and the external power source.

[0011] By adopting the above technical solution, the thermocouple can collect the temperature inside the heating chamber in real time and feed the temperature signal back to the temperature controller. The temperature controller controls the on / off state of the solid-state relay according to the preset target temperature, thereby controlling the connection between the heating resistor and the external power supply, thus achieving precise control of the temperature inside the heating chamber, ensuring that the quenching temperature is stable within a suitable range, and ensuring the quenching effect of the micro-parts for watches.

[0012] Optionally, the target temperature of the temperature controller is 785±5℃, the fuel storage tank contains a mixture of methanol and ethanol, and the liquid level of the methanol and ethanol mixture is located above the position of the exhaust pipe in the vertical direction.

[0013] By adopting the above technical solution, the target temperature of the temperature controller is set to 785±5℃, which can ensure that the micro parts for watches are quenched at a suitable temperature. This temperature is higher than the ignition point of the methanol-ethanol mixture, which allows the mixture to spontaneously combust in the presence of air, consuming the air in the furnace and preventing the parts from oxidizing and decarburizing, without the need for a mechanical vacuum pump. When there is no air in the furnace, the mixture can quickly vaporize and be discharged from the exhaust pipe, further preventing air intrusion, ensuring the stability of the quenching process, and ensuring that the parts achieve the required hardness, are free from oxidation and decarburization, and have minimal deformation after quenching.

[0014] Optionally, a start switch is also included, which is connected in series between the solid-state relay and the temperature controller.

[0015] By adopting the above technical solution, the start switch is connected in series between the solid-state relay and the temperature controller as the main switch, which can conveniently and uniformly control the start and stop of the heating components, effectively improve the safety and reliability of the quenching furnace, and at the same time make it easy for operators to flexibly start or stop the entire heating control process according to actual needs.

[0016] Optionally, the cooling oil tank is equipped with a heating protection frame, and an oil temperature gauge is provided outside the cooling oil tank. The probe of the oil temperature gauge is located below the liquid level of the quenching cooling oil, and the capacity of the cooling oil tank is at least 40L.

[0017] By adopting the above technical solution, the heating protective frame installed in the cooling oil tank can protect and organize the parts, preventing them from colliding or piling up during the cooling process and ensuring the consistency of the cooling effect; the oil temperature gauge can monitor the temperature of the quenching cooling oil in real time, ensuring that the cooling process is carried out in a suitable temperature environment, thereby ensuring the quenching quality; the cooling oil tank has a capacity of at least 40L, which can meet the cooling needs of batch parts and improve production efficiency.

[0018] Optionally, the total power of the heating resistor is 4-6KW.

[0019] By adopting the above technical solution, the total power of the heating resistor is 4-6KW, which can raise the temperature to 785±5℃ within one hour. This can stabilize the quenching temperature, ensure the quenching effect, and ensure that the hardness of the watch-specific micro parts meets the standard after quenching, thus meeting the temperature requirements for the quenching treatment of the parts. At the same time, this power range can take into account both heating efficiency and energy consumption, achieving good economic efficiency.

[0020] Optionally, the thickness of the main furnace body is 4-6mm, the length of the main furnace body is 520-560mm, the inner diameter of the main furnace body is 420-440mm, the thickness of the insulation layer is 120-160mm, the outer diameter of the furnace liner is 140-160mm, and the length of the heat-insulating handle is 160-200mm.

[0021] By adopting the above technical solutions, the main furnace body has a thickness of 4-6mm, a length of 520-560mm, and an inner diameter of 420-440mm. This ensures the structural strength of the furnace body while allowing for flexible size adjustments within a certain range to adapt to different production needs. A 120-160mm thick insulation layer effectively reduces heat loss, ensuring uniform and stable temperature within the furnace. The 140-160mm outer diameter furnace liner works better with the insulation layer to achieve efficient and stable heating. A 160-200mm long heat-insulated handle allows operators to safely handle the parts-bearing components, preventing burns. These parameters enable the quenching furnace to meet the quenching requirements of small watch parts while providing better adaptability, insulation, safety, and operability.

[0022] Optionally, the main furnace body is made of stainless steel, the insulation layer is made of asbestos, aluminum silicate refractory fiber or rock wool, the furnace liner is made of silicon carbide, and the component bearing assembly is made of 310S high-temperature resistant stainless steel or titanium alloy.

[0023] By adopting the above technical solutions, the main furnace body is made of stainless steel, which has good corrosion resistance and strength, ensuring the durability and stability of the furnace body; the insulation layer is made of asbestos, aluminum silicate refractory fiber, or rock wool, which have excellent insulation properties, effectively reducing heat loss, ensuring stable furnace temperature, and thus reducing energy consumption; the furnace liner is made of silicon carbide, which can withstand high-temperature environments, ensuring the stability and safety of the heating process, while extending the service life of the heating tubes; the component bearing components are made of 310S high-temperature resistant stainless steel or titanium alloy, which has good high-temperature resistance, can adapt to the high-temperature environment inside the quenching furnace, and has a certain strength and corrosion resistance, which can prevent the components from being damaged during bearing and transfer, ensuring the quenching quality of the components.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. Adapts to the tiny components specifically designed for watches, precisely meeting their material and size requirements, thereby improving watch quality and lifespan; 2. It uses a mixture of liquids in the fuel storage tank for combustion to exhaust air, eliminating the need for a mechanical vacuum pump. This makes it easy to operate, low in cost, and prevents oxidation and decarburization of parts. 3. The heating components keep the temperature stable at 785±5℃, providing good heat preservation. The symmetrical design ensures uniform temperature inside the furnace, improving the quenching quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a quenching furnace for watch-specific micro parts provided in an embodiment of this application, wherein the fuel storage tank is not shown.

[0026] Figure 2 This is a schematic diagram of the internal structure of a quenching furnace for watch-specific micro-parts provided in an embodiment of this application.

[0027] Explanation of reference numerals in the attached drawings: 1-Main furnace body; 2-Insulation layer; 3-Furnace liner; 4-Furnace cover plate; 5-Refractory brick; 6-Exhaust pipe; 601-Feeding trough; 7-Fuel storage tank; 8-Control valve; 9-Cooling oil tank; 10-Arch-shaped shovel; 1001-Insulated handle; 11-Thermocouple; 12-Heating protective frame; 13-Hollow base. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0029] This application discloses a quenching furnace for micro-parts specifically designed for watches.

[0030] like Figure 1 As shown, the quenching furnace for watch-specific micro parts includes a furnace body assembly, an oxygen isolation assembly, a heating assembly, a cooling assembly, and a part-bearing assembly. These components work together to provide a stable structure and thermal insulation environment, prevent oxidation and decarburization of the parts, provide a suitable quenching temperature, achieve rapid cooling of the parts, and facilitate the handling and sorting of the parts. Ultimately, this process enables precise quenching of watch-specific micro parts, achieving excellent quenching results.

[0031] like Figure 1 and Figure 2 As shown, the furnace assembly includes a main furnace body 1, an insulation layer 2, a furnace liner 3, and a furnace cover plate 4. The main furnace body 1, insulation layer 2, and furnace liner 3 are all constructed as horizontal cylindrical structures, with the furnace cover plates 4 located at both ends of the main furnace body 1. The main furnace body 1 is the foundation structure of the entire quenching furnace, made of stainless steel with a thickness of 4-6 mm, a length of 520-560 mm, and an inner diameter of 420-440 mm. Stainless steel has good strength and corrosion resistance, ensuring the stability of the main furnace body 1 under high-temperature conditions. A hollow base 13 can be provided to support the main furnace body 1. The outer diameter of the insulation layer 2 matches the inner diameter of the main furnace body 1 and is filled inside the main furnace body 1. Its material can be asbestos, aluminum silicate refractory fiber, or rock wool, with a thickness of 120-160 mm. Asbestos has excellent thermal insulation properties, effectively reducing heat loss and ensuring temperature stability. Alumina silicate refractory fiber and rock wool also have similar insulation effects. The insulation layer 2 allows for more uniform temperature distribution within the furnace, reducing energy consumption. The outer diameter of the furnace liner 3 matches the inner diameter of the insulation layer 2, and refractory bricks 5 are installed at both ends to match the furnace cover plate 4. The outer diameter of the refractory bricks 5 also matches the inner diameter of the insulation layer 2. The furnace liner 3 is made of silicon carbide, with an outer diameter of 140-160mm. 310S high-temperature resistant stainless steel has excellent high-temperature resistance, and nickel-chromium alloy tubes also have good heating performance and high-temperature resistance.

[0032] like Figure 1 and Figure 2As shown, the oxygen isolation assembly includes an exhaust pipe 6, a fuel storage tank 7 connected to one end of the exhaust pipe 6, and a control valve 8. The exhaust pipe 6 is coaxially arranged with the furnace chamber 3, partially located inside the furnace chamber 3, and its outer diameter matches the inner diameter of the refractory bricks 5. The furnace cover plate 4 has a clearance hole for the exhaust pipe 6 to pass through. The space between the outer diameter of the exhaust pipe 6 and the inner diameter of the furnace chamber 3 forms a heating chamber. The fuel storage tank 7 contains a methanol-ethanol mixture, and the liquid level of the methanol-ethanol mixture is above the vertical position of the exhaust pipe 6. The control valve 8 is located at the outlet of the fuel storage tank 7 and is used to control the fuel supply. When the control valve 8 is opened, the methanol-ethanol mixture burns at high temperature, consuming the air in the furnace and creating an oxygen-free environment, preventing oxidation and decarburization of parts. This method does not require a mechanical vacuum pump, has a simple structure, and is easy to operate. Of course, the mixture in the fuel storage tank 7 can also be replaced with a methanol-propanol mixture or other mixtures with similar combustion properties.

[0033] like Figure 1 and Figure 2 As shown, the heating assembly is located inside the heating chamber to increase the temperature inside the exhaust pipe 6. The heating assembly includes two heating resistors (not shown in the figure), which are connected to the furnace chamber 3 and located at the center of the heating chamber, symmetrically offset from the central axis of the furnace chamber 3. The heating resistors are electrically connected to an external power source, and the total power of the heating resistors is 4-6 kW. When energized, the heating resistors generate heat, raising the temperature inside the furnace. This symmetrical offset distribution ensures a more uniform temperature inside the furnace.

[0034] like Figure 1 and Figure 2 As shown, the heating assembly also includes a thermocouple 11, a temperature controller, and a solid-state relay. Thermocouple 11 is fixedly connected to the furnace cover plate 4, and its probe is located inside the heating chamber for real-time temperature acquisition. The temperature controller is electrically connected to an external power supply and signal-connected to thermocouple 11, enabling it to receive temperature signals from the thermocouple 11. The target temperature of the temperature controller is preset to 785±5℃, and it has a built-in alarm function. When the furnace temperature exceeds the set range, the temperature controller will issue an alarm. The control circuit of the temperature controller is connected to the input circuit of the solid-state relay, and the output circuit of the solid-state relay is connected in series between the heating resistor and the external power supply. When the furnace temperature is lower than the target temperature, the temperature controller controls the solid-state relay to conduct, energizing the heating resistor; when the furnace temperature is higher than the target temperature, the temperature controller controls the solid-state relay to disconnect, stopping heating, thus achieving precise temperature control. In addition, a start switch is provided, connected in series between the solid-state relay and the temperature controller, for controlling the start and stop of the entire heating system.

[0035] like Figure 1 and Figure 2As shown, the cooling assembly includes a cooling oil tank 9 containing quenching cooling oil. A discharge chute 601 is located at the bottom of the exhaust pipe 6, away from the fuel storage tank 7. The bottom of the discharge chute 601 is submerged below the level of the quenching cooling oil. A heating protection frame 12 is installed inside the cooling oil tank 9 to protect the quenched parts. An oil temperature gauge is installed outside the cooling oil tank 9, with its probe positioned below the level of the quenching cooling oil to monitor the oil temperature in real time. The cooling oil tank 9 has a capacity of at least 40L, sufficient to meet the cooling requirements of batches of parts. The cooling oil can be a dedicated quenching cooling oil, or it can be replaced with a low-temperature cooling oil or polymer medium of equivalent performance to achieve rapid cooling of the parts and ensure that the quenching hardness meets the requirements.

[0036] like Figure 1 and Figure 2 As shown, the part-carrying assembly includes an arc-shaped shovel 10 for holding the parts to be quenched. The arc-shaped shovel 10 is used to carry the parts to be quenched into the exhaust pipe 6. The arc-shaped shovel 10 is equipped with a heat-insulated handle 1001. The shovel is made of high-temperature resistant stainless steel or titanium alloy. The front part is a semi-circular material trough, which can be divided into categories for moving parts (grid separation), gears (tooth-shaped limit), and rod springs (elastic groove). The bottom is hollow. This classification design can prevent parts from being deformed by collision and facilitate safe handling. The heat-insulated handle 1001 at the end of the shovel is 160-200mm long, which can effectively prevent operators from being burned during operation.

[0037] The implementation principle of a quenching furnace for micro-parts specifically designed for watches, as described in this application, is as follows: Precise quenching of these micro-parts is achieved through the coordinated operation of its components. The furnace body provides a stable structure and excellent insulation, reducing heat loss and ensuring temperature stability. The oxygen isolation component consumes air by burning a mixture of methanol and ethanol, creating a vacuum to prevent oxidation and decarburization of the parts. The heating component generates heat using heating resistors and achieves precise temperature control via a temperature controller and thermocouple 11, maintaining a stable furnace temperature of 785±5℃. The cooling component uses a cooling oil tank 9 and specialized cooling oil to rapidly cool the parts, ensuring the quenching hardness meets standards. The parts-bearing component facilitates the handling and sorting of parts, preventing collisions and deformation. The entire quenching furnace is suitable for watch moving parts, gears, springs, etc., featuring a simple structure, convenient operation, and low cost. It meets the needs of batch manual quenching of micro-parts for watches and offers greater adaptability and practicality compared to existing general-purpose quenching furnaces. Precise quenching of micro-parts specifically designed for watches is achieved through the coordinated operation of its components. The furnace body provides a stable structure and excellent insulation, reducing heat loss and ensuring temperature stability. The oxygen isolation component creates a vacuum by burning a mixture of methanol and ethanol to consume air, preventing oxidation and decarburization of the parts. The heating component uses heating resistors to generate heat, and precise temperature control is achieved through a temperature controller and thermocouple 11, maintaining a stable furnace temperature of 785±5℃. The cooling component uses a cooling oil tank 9 and dedicated cooling oil to achieve rapid cooling of the parts, ensuring the quenching hardness meets standards. The parts support component facilitates the handling and sorting of parts, preventing collisions and deformation. The entire quenching furnace is compatible with watch moving parts, gears, and springs made of five materials: Y100Pb, 08F, SK4, SK5, and 15P. Its simple structure, convenient operation, and low cost meet the needs of batch manual quenching of small watch parts, offering greater adaptability and practicality compared to existing general-purpose quenching furnaces.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A quenching furnace for wristwatch-specific micro parts, characterized in that, include: The furnace body assembly includes a main furnace body (1), an insulation layer (2), a furnace liner (3), and a furnace cover plate (4). The main furnace body (1), the insulation layer (2), and the furnace liner (3) are all constructed as horizontal cylindrical structures. The furnace cover plate (4) is respectively located at both ends of the main furnace body (1). The outer diameter of the insulation layer (2) matches the inner diameter of the main furnace body (1). The outer diameter of the furnace liner (3) matches the inner diameter of the insulation layer (2). The furnace liner (3) is provided with refractory bricks (5) at both ends that match the furnace cover plate (4). The outer diameter of the refractory bricks (5) matches the inner diameter of the insulation layer (2). An oxygen isolation assembly includes an exhaust pipe (6), a fuel storage tank (7) connected to one end of the exhaust pipe (6), and a control valve (8). The exhaust pipe (6) is coaxially arranged with the furnace shell (3). Part of the exhaust pipe (6) is located inside the furnace shell (3). The outer diameter of the exhaust pipe (6) matches the inner diameter of the refractory brick (5). The space between the outer diameter of the exhaust pipe (6) and the inner diameter of the furnace shell (3) forms a heating chamber. The control valve (8) is located at the outlet of the fuel storage tank (7). A heating assembly is disposed inside the heating chamber and is used to increase the temperature inside the exhaust pipe (6); The cooling assembly includes a cooling oil tank (9) containing quenching cooling oil, and a discharge chute (601) is provided at the bottom of the exhaust pipe (6) away from the fuel storage tank (7). The bottom of the discharge chute (601) is submerged below the liquid level of the quenching cooling oil. The part carrying assembly includes an arc-shaped shovel (10) for holding the part to be quenched, the arc-shaped shovel (10) for carrying the part to be quenched into the exhaust pipe (6), and the arc-shaped shovel (10) is provided with a heat-insulated handle (1001).

2. The quenching furnace according to claim 1, characterized in that, The heating assembly includes two heating resistors connected to the furnace chamber (3). The heating resistors are located at the center of the heating chamber and are symmetrically offset relative to the central axis of the furnace chamber (3). The heating resistors are electrically connected to an external power source.

3. The quenching furnace according to claim 2, characterized in that, The heating assembly also includes a thermocouple (11), a temperature controller and a solid-state relay. The thermocouple (11) is fixedly connected to the furnace cover plate (4). The probe of the thermocouple (11) is located in the heating cavity. The temperature controller is electrically connected to an external power source. The temperature controller is signal-connected to the thermocouple (11). The control circuit of the temperature controller is signal-connected to the input circuit of the solid-state relay. The output circuit of the solid-state relay is connected in series between the heating resistor and the external power source.

4. The quenching furnace according to claim 3, characterized in that, The target temperature of the temperature controller is 785±5℃. The fuel storage tank (7) contains a mixture of methanol and ethanol. The liquid level of the methanol and ethanol mixture is located above the position of the exhaust pipe (6) in the vertical direction.

5. The quenching furnace according to claim 3, characterized in that, It also includes a start switch, which is connected in series between the solid-state relay and the temperature controller.

6. The quenching furnace according to claim 1, characterized in that, The cooling oil tank (9) is equipped with a heating protection frame (12), and an oil temperature gauge is provided outside the cooling oil tank (9). The probe of the oil temperature gauge is located below the liquid level of the quenching cooling oil, and the capacity of the cooling oil tank (9) is at least 40L.

7. The quenching furnace according to claim 2, characterized in that, The total power of the heating resistor is 4-6KW.

8. The quenching furnace according to claim 7, characterized in that, The thickness of the main furnace body (1) is 4-6mm, the length of the main furnace body (1) is 520-560mm, the inner diameter of the main furnace body (1) is 420-440mm, the thickness of the insulation layer (2) is 120-160mm, the outer diameter of the furnace liner (3) is 140-160mm, and the length of the heat-insulating handle (1001) is 160-200mm.

9. The quenching furnace according to claim 1, characterized in that, The main furnace body (1) is made of stainless steel, the insulation layer (2) is made of asbestos, aluminum silicate refractory fiber or rock wool, the furnace liner (3) is made of silicon carbide, and the component bearing assembly is made of 310S high temperature resistant stainless steel or titanium alloy.

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