An electrically heated double-sealed pit annealing furnace and its heating control system

Abstract

The present invention relates to an electrically heated double-layer sealed pit-type annealing furnace and a heating control system thereof, comprising a furnace body, a bottom cover being clamped at the bottom of the furnace body, a plurality of guide rods and clamping blocks being fixedly connected to the outer end of the furnace body, a clamping bracket being fixedly connected to the top of the bottom cover, a clamping bracket being rotatably connected to a clamp, a clamping slot being provided at the bottom of the furnace body, the bottom of the clamping slot being matched with the clamping slot, the top of the clamping block being in contact with the top of the clamping block, a heat insulation layer being fixedly connected to the inner wall of the furnace body, a plurality of heating element clamping plates being fixedly connected to the inner wall of the heat insulation layer, a sealing groove being provided at the corresponding position between the top of the bottom cover and the bottom of the heat insulation layer, the sealing groove being filled with molten metal, and adopting the above structure, the furnace body can be lifted upward, thereby simplifying the material loading and unloading process and enhancing the safety of the operator, and at the same time introducing a molten metal sealing box and double-layer sealing technology to improve the sealing performance in the furnace, reduce heat loss and maintain an ideal furnace atmosphere.

Description

Technical Field

[0001] The present invention relates to an electrically heated double-sealed pit annealing furnace and a heating control system thereof, and in particular to an electrically heated double-sealed pit annealing furnace and a heating control system thereof applied in the technical field of pit annealing furnaces. Background Art

[0002] An annealing furnace is an industrial furnace mainly used for the heat treatment of metals and other materials to achieve the desired material properties. A pit annealing furnace is a commonly used heat treatment equipment, mainly used for annealing of metal materials, and sometimes can also be used for other heat treatment processes. Annealing is a heat treatment process whose main purpose is to eliminate the internal stress of metal materials, improve or optimize their organizational structure, and thereby change their mechanical properties to make them more suitable for further processing or use. A pit annealing furnace provides a controlled temperature environment so that materials can be heated and slowly cooled at a specified temperature and time. Due to its vertical well-shaped structure, a pit annealing furnace can achieve uniform heating of the material to be treated, ensuring that the entire component or material receives a uniform heat treatment effect in the furnace. It is widely used in metallurgy, machinery manufacturing and other related fields to ensure the quality, performance and safety of materials.

[0003] The specification of Chinese invention patent CN110317940A discloses a pit-type annealing furnace for processing non-ferrous copper, comprising a furnace body, a feed hopper, and a furnace cover. The top of the furnace body is connected to the bottom of the feed hopper, the inner wall of the feed hopper is fixedly connected to the surface of the furnace cover by screws, the furnace cover is located at the bottom of the inner cavity of the feed hopper and is fixedly connected to a winding box, one side of the inner cavity of the winding box is fixedly connected to a limiting cylinder, and a rotating shaft is rotatably connected between the top and bottom of the inner wall of the limiting cylinder via a roller. The present invention relates to the technical field of pit-type annealing furnaces. The pit-type annealing furnace for processing non-ferrous copper can facilitate users to place the metal copper to be processed and can well remove the annealed metal copper, greatly improving the overall annealing efficiency, saving users' time, reducing the labor intensity of staff to a certain extent, and avoiding the safety hazards of direct operation by staff. It is highly practical, easy for users to operate, and can assist users in closing the furnace cover.

[0004] Although the above design makes it easy for users to place the metal copper to be processed and can easily remove the annealed metal copper, thereby improving the overall annealing efficiency, saving users' time, reducing the labor intensity of workers to a certain extent, and avoiding safety hazards caused by direct operation by workers, it still has certain limitations. For example, when loading and unloading materials, the operator may need to stand at the furnace mouth to observe, which may bring safety risks in some cases. In addition, traditional sealing methods may not be ideal, resulting in heat loss or infiltration of external air. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the traditional pit annealing furnace is complicated to operate and may bring safety risks when loading and unloading materials, and there are problems of heat loss and poor sealing.

[0006] In order to solve the above problems, the present invention provides an electrically heated double-layer sealed pit-type annealing furnace and its heating control system, including a furnace body, a bottom cover is clamped at the bottom of the furnace body, a plurality of guide rods and blocks are fixedly connected to the outer end of the furnace body, a buckle bracket is fixedly connected to the top of the bottom cover, a buckle is rotatably connected to the buckle bracket, a slot is provided at the bottom of the furnace body, the bottom of the buckle is matched with the slot, and the top of the buckle is in contact with the top of the block, an insulation layer is fixedly connected to the inner wall of the furnace body, a plurality of heating element clamps are fixedly connected to the inner wall of the insulation layer, a plurality of heating element clamps are clamped at one end away from the insulation layer with a heating element, the end of the heating element clamp in contact with the heating element is a wedge-shaped groove structure, and the wedge angle of the wedge groove is greater than 90 degrees, a sealing groove is provided at the corresponding position between the top of the bottom cover and the bottom of the insulation layer, and the sealing groove is filled with molten metal.

[0007] In the above-mentioned electrically heated double-layer sealed pit annealing furnace and its heating control system, the furnace body can be lifted upward, thereby simplifying the material loading and unloading process and enhancing the safety of the operator. At the same time, a molten metal sealing box and double-layer sealing technology are introduced to improve the sealing performance in the furnace, reduce heat loss and maintain an ideal furnace atmosphere.

[0008] As a further improvement of the present application, the molten metal can be any one of tin, lead, aluminum and copper, or an alloy made of several of them. The first sealing ring, the second sealing ring and the third sealing ring are clamped on both sides of the sealing groove. The first sealing ring, the second sealing ring and the third sealing ring are all made of high-temperature resistant materials. A clamping groove is opened on the outside of the sealing groove at the top of the bottom cover. The clamping groove is a wedge-shaped structure. A clamping block is slidably connected in the clamping groove. The clamping block is a wedge-shaped structure that matches the clamping groove. The top of the clamping block is fixedly connected to the bottom of the furnace body, and a protective frame is fixedly connected to the inside of the sealing groove at the top of the bottom cover.

[0009] As a further improvement of the present application, the bottom of the bottom cover is slidably connected to a slide rail, the bottom of the slide rail is fixedly connected to a bottom plate, and the width of the bottom plate is greater than the diameter of the bottom cover.

[0010] As a further improvement of the present application, a bracket is fixedly connected to the outer side of the bottom cover at the top of the base plate, a slide groove is provided on the bracket in the vertical direction, the slide groove is slidably connected to the guide rod, and a top plate is fixedly connected to the top of the slide groove.

[0011] As another improvement of the present application, a gearbox is fixedly connected to the top of the top plate, a motor is fixedly connected to the top of the gearbox, the motor power shaft passes through the top of the gearbox and extends into the gearbox, and the extended part is fixedly connected to a pinion.

[0012] As another improved supplement to the present application, the outer end of the small gear is meshedly connected to the large gear, and the central thread of the large gear is connected to the lifting screw. The lifting screw passes through the top plate and the gearbox in sequence and extends to the lower side of the top plate and the upper side of the gearbox respectively, and the part extending to the lower side of the top plate is rotatably connected to the top of the furnace body.

[0013] As another improved supplement to the present application, a control system is fixedly connected to the outer end of the bracket, a plurality of temperature sensors are provided in the furnace body, and the temperature sensors are electrically connected to the control system through wires, and the heating element and the motor are also electrically connected to the control system through wires.

[0014] As another improvement of the present application, the control system includes a controller, a regulator, a solid-state relay, a safety protection device, a display, a communication interface and an alarm device. The controller is used to receive input, process information and output instructions to other components. The regulator is connected to the controller and adjusts the heating amount according to the instructions of the controller. The solid-state relay turns on or off the current and provides power to the heating element according to the instructions of the regulator. The safety protection device is used to cut off the power supply when the temperature in the furnace exceeds a preset upper limit. The display is connected to the controller and displays real-time data, status and other important information in the furnace. The communication interface is connected to the controller for remote monitoring and control of the operation of the annealing furnace. The alarm device includes an audio and / or optical alarm system for issuing a warning when the system is abnormal or reaches certain preset conditions.

[0015] In summary, this solution has the following beneficial effects:

[0016] 1. Double-layer sealing technology: Improve the sealing performance in the furnace. The molten metal sealing box and double-layer sealing technology can not only provide efficient thermal insulation, but also ensure that the specific atmosphere in the furnace is retained, which helps to improve the annealing effect. Effective sealing can greatly reduce the loss of heat energy, thereby improving energy efficiency, reducing energy consumption and saving costs.

[0017] 2. Furnace lifting function: The lifting function of the furnace body makes the loading and unloading process of materials simpler and more intuitive, improving operational efficiency. The lifting function also ensures that the operator keeps a certain distance from high-temperature components when loading and unloading materials, thereby reducing the risk of burns and other accidents.

[0018] 3. Bottom cover sliding design: The bottom cover can move on the slide rail, which provides additional convenience for loading and unloading of materials. It enables the materials to be quickly and conveniently removed from the furnace after annealing, speeding up the entire annealing process, which is particularly valuable in batch production.

[0019] 4. Intelligent control system: By precisely setting parameters such as temperature and time, the operator can ensure the accuracy and repeatability of the annealing process. The combination of safety protection devices and alarm systems ensures that in abnormal situations, the system can take prompt measures to protect the safety of equipment and operators. The design of the communication interface provides remote operation capabilities, which makes monitoring and adjusting the working status of the annealing furnace more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A partial schematic diagram of the internal structure of this application Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the furnace structure of this application;

[0022] Figure 3 This is a schematic diagram of the furnace cover structure of this application;

[0023] Figure 4 A top view of the present application;

[0024] Figure 5 It is the AA cross-sectional view of this application;

[0025] Figure 6 This is the BB cross-sectional view of this application;

[0026] Figure 7 This is the CC cross-sectional view of this application;

[0027] Figure 8 This is an enlarged view of point D of this application;

[0028] Figure 9 This is a schematic diagram of the appearance structure of this application;

[0029] Figure 10 A partial schematic diagram of the internal structure of this application Figure 2 ;

[0030] Figure 11 This is the control system structure diagram of this application.

[0031] Description of the numbers in the figure:

[0032] 1. Furnace body; 2. Bottom cover; 3. Guide rod; 4. Clamping block; 5. Clamp bracket; 6. Clamp; 7. Clamping slot; 8. Insulation layer; 9. Heating element clamping plate; 10. Heating element; 11. Sealing groove; 12. First sealing ring; 13. Second sealing ring; 14. Third sealing ring; 15. Pressing groove; 16. Pressing block; 17. Protective frame; 18. Slide rail; 19. Bottom plate; 20. Bracket; 21. Slide slot; 22. Top plate; 23. Gearbox; 24. Motor; 25. Pinion; 26. Gear; 27. Lifting screw; 28. Control system. DETAILED DESCRIPTION

[0033] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0034] The first implementation method:

[0035] Figure 1-3 Shown.

[0036] An electrically heated double-layer sealed pit annealing furnace and its heating control system, comprising a furnace body 1, a bottom cover 2 being clamped at the bottom of the furnace body 1, a plurality of guide rods 3 and a clamping block 4 being fixedly connected to the outer end of the furnace body 1, a clamping bracket 5 being fixedly connected to the top of the bottom cover 2, a clamping bracket 5 being rotatably connected to a clamping bracket 5, a clamping slot 7 being provided at the bottom of the furnace body 1, the bottom of the clamping bracket 6 being matched with the clamping slot 7, the top of the clamping bracket 6 being in contact with the top of the clamping block 4, an insulating layer 8 being fixedly connected to the inner wall of the furnace body 1, and a plurality of heating element clamping plates being fixedly connected to the inner wall of the insulating layer 8 Plate 9, multiple heating element clamping plates 9 are clamped with heating elements 10 at one end away from the insulation layer 8, the end of the heating element clamping plate 9 that contacts the heating element 10 is a wedge-shaped groove structure, and the wedge angle of the wedge-shaped groove is greater than 90 degrees, and a sealing groove 11 is provided at the corresponding position of the top of the bottom cover 2 and the bottom of the insulation layer 8. The sealing groove 11 is filled with molten metal, which can be any one of tin, lead, aluminum and copper, or an alloy made of several of them. A first sealing ring 12, a second sealing ring 13 and a third sealing ring 14 are clamped on both sides of the sealing groove 11.

[0037] In the above-mentioned electrically heated double-layer sealed pit annealing furnace and its heating control system, the furnace body 1 can be lifted upward, thereby simplifying the material loading and unloading process and enhancing the safety of the operator. At the same time, a molten metal sealing box and double-layer sealing technology are introduced to improve the sealing performance in the furnace, reduce heat loss and maintain an ideal furnace atmosphere.

[0038] When in use, select a suitable metal or alloy according to the annealing temperature, so that the annealing temperature is slightly higher than the melting point of the metal or alloy.

[0039] When the furnace body 1 moves downward, the slot 7 at the bottom of the furnace body 1 pushes the buckle 6 downward. Since the slot 7 is rotatably connected to the buckle bracket 5, the buckle 6 will start to rotate, and the bottom of the buckle 6 moves downward following the slot 7. The top of the buckle 6 gradually contacts the top of the block 4 at the outer end of the furnace body 1. When the bottom of the furnace body 1 is against the top of the bottom cover 2, the buckle 6 just contacts the top of the block 4. The buckle 6 completes the locking of the block 4, so that the furnace body 1 is stuck. At the same time, the thermal insulation layer 8 and the first sealing ring 12, the second sealing ring 13 and the third sealing ring 14 on both sides of the sealing groove 11 form a first layer of seal, and the thermal insulation layer 8 contacts the molten metal in the sealing groove 11 to form a second layer of seal.

[0040] The furnace body 1 provides an annealing space, ensuring the isolation and control of the entire annealing process. The bottom cover 2 provides a reliable seal to ensure the stability of the atmosphere inside the furnace body 1 and prevent heat loss. The guide rod 3 and the block 4 ensure the smooth lifting of the furnace body 1. The block 4 and the buckle 6 cooperate to form a locking mechanism to ensure that the furnace body 1 is stably locked when needed. The buckle bracket 5 and the buckle 6 serve as the locking mechanism of the furnace body 1. When the furnace body 1 moves down and contacts the bottom cover 2, the buckle 6 can fix the furnace body 1. The thermal insulation layer 8 effectively reduces the heat loss and ensures the efficiency of the annealing process. The heating element 10 provides the required heating energy, and the heating element card plate 9 ensures its Fixed and evenly distributed inside the furnace body 1, the sealing groove 11 together with the molten metal provides a double-layer sealing technology. The first layer is formed by the thermal insulation layer 8 and the sealing ring, and the second layer is formed by the thermal insulation layer 8 and the molten metal. The double sealing technology effectively reduces the loss of heat and gas and maintains the atmosphere in the furnace. Since the furnace body 1 can be lifted upward, this simplifies the loading and unloading process of materials and reduces the risk of operators. Through the molten metal and double-layer sealing technology, excellent sealing in the furnace is ensured, thereby reducing heat loss and maintaining an ideal atmosphere in the furnace. The automatic locking design of the buckle 6 and the block 4 ensures that the furnace body 1 always maintains a stable position during the annealing process.

[0041] The second implementation method:

[0042] Figure 2-10 Shown.

[0043] The first sealing ring 12, the second sealing ring 13 and the third sealing ring 14 are all made of high temperature resistant materials. A pressing groove 15 is provided on the outside of the sealing groove 11 at the top of the bottom cover 2. The pressing groove 15 is a wedge-shaped structure. A pressing block 16 is slidably connected in the pressing groove 15. The pressing block 16 is a wedge-shaped structure that matches the pressing groove 15. The top of the pressing block 16 is fixedly connected to the bottom of the furnace body 1. A protective frame 17 is fixedly connected to the inside of the sealing groove 11 at the top of the bottom cover 2. A slide rail 18 is slidably connected to the bottom of the bottom cover 2. The bottom of the slide rail 18 is fixedly connected to a bottom plate 19. The width of the bottom plate 19 is greater than the diameter of the bottom cover 2. A bracket 20 is fixedly connected to the outside of the bottom cover 2 at the top of the bottom plate 19. A slide groove 21 is provided on the bracket 20 in the vertical direction. The slide groove 21 is slidably connected to the guide rod 3. The top of the slide groove 21 is fixedly connected to a top plate 22. The top plate 2 A gearbox 23 is fixedly connected to the top of the gearbox 23, and a motor 24 is fixedly connected to the top of the gearbox 23. The power shaft of the motor 24 passes through the top of the gearbox 23 and extends into the gearbox 23. A small gear 25 is fixedly connected to the extended portion. The outer end of the small gear 25 is meshed with a large gear 26. A lifting screw 27 is threadedly connected to the center of the large gear 26. The lifting screw 27 passes through the top plate 22 and the gearbox 23 in sequence and extends to the lower side of the top plate 22 and the upper side of the gearbox 23 respectively. The portion extending to the lower side of the top plate 22 is rotatably connected to the top of the furnace body 1. A control system 28 is fixedly connected to the outer end of the bracket 20. A plurality of temperature sensors are provided in the furnace body 1, and the temperature sensors are electrically connected to the control system 28 through wires. The heating element 10 and the motor 24 are also electrically connected to the control system 28 through wires.

[0044] When in use, first control the motor 24 to rotate through the control system 28, and the rotation of the motor 24 drives the small gear 25 to rotate, and the small gear 25 drives the large gear 26 to rotate. Since the guide rod 3 fixedly connected to the outer end of the furnace body 1 is slidably connected to the slide groove 21, and the large gear 26 is threadedly connected to the lifting screw 27, and the lifting screw 27 is rotatably connected to the top of the furnace body 1, the large gear 26 drives the lifting screw 27 to move upward when it rotates, and the lifting screw 27 then drives the furnace body 1 to move upward. Move the furnace body 1 to a suitable position as needed, and then place the material to be annealed on the top of the bottom cover 2. The protective frame 17 located on the top of the bottom cover 2 can support the material. After the material is placed, the control system 28 is used to control the motor 24 to rotate in the opposite direction to move the furnace body 1 downward.

[0045] When the furnace body 1 moves downward, the furnace body 1 drives the clamping block 16 to move downward together. When the bottom of the clamping block 16 contacts the top of the first sealing ring 12, since the clamping block 16 is a wedge-shaped structure that matches the clamping groove 15, when the clamping block 16 moves downward, it will squeeze the first sealing ring 12, causing the first sealing ring 12 to move toward the center of the furnace body 1, thereby making the first sealing ring 12 fit more closely with the insulation layer 8 to form a more effective seal. At the same time, since the temperature in the furnace body 1 is maintained above the melting point of the metal in the sealing groove 11 during the annealing process, the metal in the sealing groove 11 is always kept in liquid form, which helps to form a better sealing effect. When the furnace body 1 moves to a fixed position, the heating element 10 is started by the control system 28 to start heating.

[0046] After the material is annealed, the furnace body 1 is lifted up, and then a suitable tool is selected to push the bottom cover 2 so that the bottom cover 2 slides to a suitable position on the slide rail 18, so that the annealed material is kept away from the furnace body 1 and the staff can approach the annealed material for subsequent processing.

[0047] The first sealing ring 12, the second sealing ring 13 and the third sealing ring 14 are made of high-temperature resistant materials, which provide a tight seal between the furnace body 1 and the bottom cover 2, ensuring the stability of the atmosphere in the furnace, reducing heat loss and maintaining the atmosphere in the furnace, thereby optimizing the annealing process. The compression groove 15 and the compression block 16 are combined to form an effective sealing and pressurizing mechanism. When the furnace body 1 moves downward, the compression block 16 can apply pressure to the first sealing ring 12 to ensure a tighter seal with the thermal insulation layer 8. The protective frame 17 provides support for the annealing material to ensure that the material is firmly placed when placed to prevent movement during lifting or heating. The slide rail 18, the bottom plate 19 and the bracket 20 provide a stable support and sliding system to ensure that the furnace body 1 and the bottom cover 2 move smoothly and accurately. The slide groove 21 and The guide rod 3 provides a linear lifting guide for the furnace body 1, ensuring the stability and accuracy of its moving path. The gearbox 23 and the motor 24 are connected through the gearbox 23. The power provided by the motor 24 can be effectively converted into the lifting power of the furnace body 1, and the moving speed of the furnace body 1 can be adjusted as needed. The mechanical conversion mechanism of the small gear 25, the large gear 26 and the lifting screw 27 enables the rotational power of the motor 24 to be converted into the linear lifting power of the furnace body 1. The control system 28 and the temperature sensor, through the control system 28, the operator can monitor the temperature in the furnace in real time and make adjustments. The temperature sensor provides real-time temperature data in the furnace, ensuring precise control of the annealing process. The heating element 10 directly provides the required heating in the furnace, and cooperates with the control system 28 to accurately adjust and control the temperature in the furnace.

[0048] The third implementation method:

[0049] Figure 10-11 Shown.

[0050] The control system 28 includes a controller, a regulator, a solid-state relay, a safety protection device, a display, a communication interface and an alarm device. The controller is used to receive input, process information and output instructions to other components. The regulator is connected to the controller and adjusts the heating amount according to the instructions of the controller. The solid-state relay turns on or off the current and provides power to the heating element according to the instructions of the regulator. The safety protection device is used to cut off the power supply when the temperature in the furnace exceeds a preset upper limit. The display is connected to the controller and displays real-time data, status and other important information in the furnace. The communication interface is connected to the controller for remote monitoring and control of the operation of the annealing furnace. The alarm device includes an audio and / or optical alarm system for issuing a warning when the system is abnormal or reaches certain preset conditions.

[0051] The controller processes input parameters such as set temperature and time, and generates corresponding output instructions. The regulator is directly connected to the controller. Based on the controller's output instructions, the regulator can fine-tune the heating amount to keep the furnace temperature within the set range. The solid-state relay is a switching element that turns the current on or off according to the regulator's instructions. In this way, the solid-state relay can provide or cut off power to the heating element as needed, thereby adjusting the heating amount. When the furnace temperature exceeds the preset upper limit, this safety protection device will immediately intervene and cut off the power to the heating element to ensure the safety of the equipment and operators. The display provides a user-friendly interface, allowing operators to view the furnace status, temperature, and other important information in real time. The communication interface provides the possibility of remote monitoring and control. Through this interface, the operator can view and control the status of the annealing furnace from the office or other remote locations. The alarm device will immediately issue a warning through the sound and / or optical system when the system is abnormal or reaches a preset condition, such as the temperature exceeding the upper limit or the heating element failure, to remind the operator to take appropriate measures.

[0052] The operator sets the annealing furnace's operating parameters, such as target temperature and working time, through the display. The controller receives these inputs, starts processing this information, and generates corresponding instructions. The regulator adjusts the heating amount according to the controller's instructions, and the solid-state relay provides or cuts off power to the heating element according to the regulator's instructions. If the temperature inside the furnace exceeds the preset upper limit, the safety protection device will cut off the power to ensure safety. During the entire process, the display shows the status of the furnace in real time, and the operator can use it to monitor the progress of the work. If the system has an abnormality or reaches certain preset conditions, the alarm device will issue a warning. At the same time, through the communication interface, the status of the annealing furnace can be remotely monitored and controlled in real time.

[0053] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. An electrically heated double-sealed pit annealing furnace and its heating control system, characterized by: The invention comprises a furnace body (1), wherein the bottom of the furnace body (1) is clamped with a bottom cover (2), the outer end of the furnace body (1) is fixedly connected with a plurality of guide rods (3) and a clamping block (4), the top of the bottom cover (2) is fixedly connected with a clamping bracket (5), the clamping bracket (5) is rotatably connected with a clamping buckle (6), the bottom of the furnace body (1) is provided with a clamping slot (7), the bottom of the clamping buckle (6) is matched with the clamping slot (7), the top of the clamping buckle (6) is in contact with the top of the clamping block (4), and the furnace body (1) is provided with a clamping slot (7). The wall is fixedly connected to a heat insulating layer (8), the inner wall of the heat insulating layer (8) is fixedly connected to a plurality of heating element clamps (9), the ends of the plurality of heating element clamps (9) away from the heat insulating layer (8) are all clamped with a heating element (10), the ends of the heating element clamps (9) in contact with the heating element (10) are wedge-shaped groove structures, and the wedge angle of the wedge groove is greater than 90 degrees, and a sealing groove (11) is provided at a position corresponding to the top of the bottom cover (2) and the bottom of the heat insulating layer (8), and the sealing groove (11) is filled with molten metal; The molten metal may be any one of tin, lead, aluminum and copper, or an alloy made of several of them. A first sealing ring (12), a second sealing ring (13) and a third sealing ring (14) are clamped on both sides of the sealing groove (11). The first sealing ring (12), the second sealing ring (13) and the third sealing ring (14) are all made of high-temperature resistant materials. A pressing groove (15) is provided on the outer side of the sealing groove (11) at the top of the bottom cover (2); The pressing groove (15) is a wedge-shaped structure, a pressing block (16) is slidably connected in the pressing groove (15), the pressing block (16) is a wedge-shaped structure matched with the pressing groove (15), the top of the pressing block (16) is fixedly connected to the bottom of the furnace body (1), and a protective frame (17) is fixedly connected to the inner side of the sealing groove (11) at the top of the bottom cover (2); The pressing block (16) moves downward to squeeze the first sealing ring (12), and the first sealing ring (12) moves toward the center of the furnace body (1). The first sealing ring (12) and the thermal insulation layer (8) fit more tightly to form a more effective seal.

2. The electrically heated double-sealed pit annealing furnace and its heating control system according to claim 1, characterized in that: The bottom of the bottom cover (2) is slidably connected to a slide rail (18), and the bottom of the slide rail (18) is fixedly connected to a bottom plate (19), and the width of the bottom plate (19) is greater than the diameter of the bottom cover (2).

3. The electrically heated double-sealed pit annealing furnace and its heating control system according to claim 2, characterized in that: A bracket (20) is fixedly connected to the outside of the bottom cover (2) at the top of the bottom plate (19), a slide groove (21) is provided on the bracket (20) in a vertical direction, the slide groove (21) is slidably connected to the guide rod (3), and a top plate (22) is fixedly connected to the top of the slide groove (21).

4. The electrically heated double-sealed pit annealing furnace and its heating control system according to claim 3, characterized in that: The top of the top plate (22) is fixedly connected to a gearbox (23), the top of the gearbox (23) is fixedly connected to a motor (24), a power shaft of the motor (24) passes through the top of the gearbox (23) and extends into the gearbox (23), and the extended portion is fixedly connected to a pinion (25).

5. The electrically heated double-sealed pit annealing furnace and its heating control system according to claim 4, characterized in that: The outer end of the small gear (25) is meshedly connected to the large gear (26), and the central thread of the large gear (26) is connected to the lifting screw (27). The lifting screw (27) passes through the top plate (22) and the gearbox (23) in sequence and extends to the lower side of the top plate (22) and the upper side of the gearbox (23) respectively. The portion extending to the lower side of the top plate (22) is rotatably connected to the top of the furnace body (1).

6. The electrically heated double-sealed pit annealing furnace and its heating control system according to claim 3, characterized in that: The outer end of the bracket (20) is fixedly connected to a control system (28). A plurality of temperature sensors are provided in the furnace body (1), and the temperature sensors are electrically connected to the control system (28) via wires. The heating element (10) and the motor (24) are also electrically connected to the control system (28) via wires.

7. The electrically heated double-sealed pit annealing furnace and its heating control system according to claim 6, characterized in that: The control system (28) includes a controller, a regulator, a solid-state relay, a safety protection device, a display, a communication interface and an alarm device, wherein the controller is used to receive input, process information and output instructions to other components, the regulator is connected to the controller and adjusts the heating amount according to the instructions of the controller, the solid-state relay turns on or off the current according to the instructions of the regulator and provides power to the heating element, the safety protection device is used to cut off the power supply when the temperature in the furnace exceeds a preset upper limit, the display is connected to the controller and displays real-time data, status and other important information in the furnace, the communication interface is connected to the controller for remote monitoring and control of the operation of the annealing furnace, and the alarm device includes an audio and / or optical alarm system for issuing a warning when the system is abnormal or reaches certain preset conditions.

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