Furnace door heat shield automatic advancing and retreating mechanism for vacuum resistance furnace

Abstract

The invention relates to the field of vacuum resistance furnaces, in particular to a furnace door heat shield automatic advancing and retreating mechanism for a vacuum resistance furnace, which comprises a driving part, a mounting seat, a connecting shaft, an adapter and a guide component, the mounting seat is welded on an inner seal head and an outer seal head of a furnace door of the vacuum resistance furnace, the driving part is fixed on the mounting seat, and the adapter is connected with the driving part through the connecting shaft. The driving piece drives the furnace door heat screen to move in the direction close to or away from the mounting base, and the furnace door heat screen is mounted on the adapter; the guide assembly is used for guiding the furnace door heat screen and comprises a fixed part and a sliding part, the fixed part is connected with a furnace door of the vacuum resistance furnace, and the sliding part is connected with the furnace door heat screen and slidably connected with the fixed part. The cooling device has the effect of increasing the cooling speed under the natural cooling working condition so as to improve the production efficiency.

Description

Technical Field

[0001] The present application relates to the field of vacuum resistance furnaces, and in particular to an automatic advance and retreat mechanism for a heat insulation screen of a furnace door of a vacuum resistance furnace. Background Art

[0002] The vacuum resistance furnace is a thermal processing equipment that uses electric current to convert electrical energy into thermal energy through electric heating elements to heat or melt workpieces. It is mainly used for the production of new materials. According to the furnace temperature range, it can be divided into low-temperature furnaces below 1150℃ and high-temperature furnaces above 1600℃, and medium-temperature furnaces are between the two. Since the vacuum resistance furnace consumes a lot of energy, and energy is an important material basis for national economic and social development, when designing the vacuum resistance furnace, attention should be paid to improving thermal efficiency and reducing energy consumption. There are many factors that affect the energy consumption level of the vacuum resistance furnace, among which improving the insulation effect of the heat insulation screen is crucial. When the heat insulation screen has excellent insulation effect, the cooling time of the furnace is also longer, so the production efficiency will be reduced accordingly. Therefore, while ensuring the insulation effect of the heat insulation screen and improving the thermal efficiency of the vacuum resistance furnace, it is the design focus of the vacuum resistance furnace to reasonably accelerate its cooling speed.

[0003] The cooling methods of vacuum resistance furnaces usually adopt forced air cooling and natural cooling. The forced air cooling system is generally composed of three parts: a fan, a heat exchanger and a cooling air duct. According to the structural type, it can be divided into two types: internal circulation and external circulation. Its working principle is that the gas is driven by the fan to transfer the heat generated during the heating process to the heat exchanger. After the heat exchange between the gas and the heat exchanger, the gas is sent back to the furnace by the fan. After this reciprocating cycle, the purpose of uniform and rapid cooling is achieved. Natural cooling refers to the method in which the workpiece is heated to a specified temperature in the furnace without cooling intervention, and is allowed to dissipate heat naturally in a vacuum state, so that it cools down slowly.

[0004] Forced air cooling uses cooling gas, fans, heat exchangers and other components, which makes the forced air cooling method complex and expensive. In addition, for some workpieces, forced air cooling may result in poor workpiece molding quality. Compared with forced air cooling, natural cooling is simple to operate and low in cost, but the cooling time is relatively long, which affects production efficiency. Since the cooling method of the vacuum resistance furnace needs to be selected according to the characteristics of the workpiece and production requirements, many vacuum resistance furnaces on the market currently use natural cooling. Therefore, how to speed up the cooling speed under natural cooling conditions is an urgent problem to be solved. Summary of the invention

[0005] In order to speed up the cooling speed under natural cooling conditions and improve production efficiency, the present application provides an automatic advance and retreat mechanism for a heat insulation screen of a furnace door of a vacuum resistance furnace.

[0006] The present application provides an automatic advance and retreat mechanism for a heat insulation screen of a vacuum resistance furnace door, which adopts the following technical solution: An automatic advance and retreat mechanism for a furnace door heat insulation screen for a vacuum resistance furnace, comprising a driving member, a mounting seat, a connecting shaft, an adapter seat and a guide assembly, wherein the mounting seat is welded to the inner and outer heads of the furnace door of the vacuum resistance furnace, the driving member is fixed to the mounting seat, the adapter seat is connected to the driving member via the connecting shaft, the driving member drives the furnace door heat insulation screen to move toward or away from the mounting seat, and the furnace door heat insulation screen is installed on the adapter seat; the guide assembly is used to guide the furnace door heat insulation screen, and the guide assembly comprises a fixed part and a sliding part, the fixed part is connected to the furnace door of the vacuum resistance furnace, the sliding part is connected to the furnace door heat insulation screen, and the sliding part is slidably connected to the fixed part.

[0007] By adopting the above technical solution, before the start of heating, the driving member drives the furnace door heat insulation screen to move away from the mounting seat through the connecting shaft. Under the action of the guide component, the sliding part moves in a directional manner on the fixed part, ensuring that the furnace door heat insulation screen and the furnace body heat insulation screen form a relatively closed space, thereby achieving excellent insulation effect during the heating process. After the heating is completed, when the furnace chamber naturally cools down to the specified temperature, the driving member drives the furnace door heat insulation screen to move towards the mounting seat, and the furnace door heat insulation screen and the furnace body heat insulation screen are pulled apart to the specified distance, so that the internal heat can be dissipated faster, thereby achieving the purpose of accelerating natural cooling. In this way, the cooling speed under natural cooling conditions is accelerated, and production efficiency is improved.

[0008] Optionally, the fixed part includes a base, which is installed on the furnace door, and the sliding part includes a heat insulation screen bracket, a mounting frame and a roller, the heat insulation screen bracket is connected to the heat insulation screen of the furnace door, the mounting frame is connected to the heat insulation screen bracket, the roller is installed on the mounting frame, and the roller rolls on the base.

[0009] By adopting the above technical solution, when the driving member drives the furnace door heat insulation screen to move, the roller rolls on the base to play a guiding role and ensure stability during the movement.

[0010] Optionally, the base includes a guide rail seat, an adjustable guide rail, a screw and a locking nut, the guide rail seat is connected to the furnace door, the adjustable guide rail is connected to the guide rail seat through the screw, and the locking nut is screwed on the screw and located below the adjustable guide rail.

[0011] By adopting the above technical solution, considering that factors such as welding deformation may easily cause deviations in the parallelism of the guide rail seat, thereby affecting the smoothness of the translation of the furnace door heat insulation screen, an adjustable guide rail is installed on the guide rail seat. The position of the adjustable guide rail can be fine-tuned by a screw and a locking nut to ensure the position accuracy and parallelism of the guide rail.

[0012] Optionally, the fixing portion further includes a front baffle and a rear baffle, wherein the front baffle and the rear baffle are both arranged on the adjustable guide rail and located at different ends, and the roller moves between the front baffle and the rear baffle.

[0013] By adopting the above technical solution, the movement distance of the heat insulation screen of the furnace door can be prevented from exceeding the range, thereby playing a role of safety protection.

[0014] Optionally, the fixing portion further includes a side baffle, the side baffle is located on a side of the adjustable guide rail close to the furnace door heat insulation screen, and the side baffle is arranged along the length direction of the adjustable guide rail.

[0015] By adopting the above technical solution, the side baffles play a blocking role to prevent the insulation layer from moving left and right.

[0016] Optionally, two screw rods are provided, and four locking nuts are provided, one screw rod corresponds to two locking nuts, the two locking nuts are located on the upper and lower sides of the adjustable guide rail, and the two screw rods are spaced apart.

[0017] By adopting the above technical solution, the two screw rods can improve the overall stability and facilitate the adjustment of the horizontality. At the same time, the two nuts can ensure the stability of the adjustable guide rail.

[0018] Optionally, the fixing portion further includes an oblique rib, and the oblique rib is connected to the guide rail seat.

[0019] By adopting the above technical solution, after determining the moving distance of the furnace door heat insulation screen, the oblique ribs can be fixed, and the oblique ribs can play a reinforcing role.

[0020] Optionally, a plurality of guide assemblies are provided, and the plurality of guide assemblies are symmetrically distributed about the furnace door heat insulation screen.

[0021] By adopting the above technical solution, when the furnace door heat insulation screen moves, the accuracy of the forward or backward moving direction of the furnace door heat insulation screen and the stability during the moving process can be ensured.

[0022] Optionally, a sealing component is further included. There is a gap between the mounting seat and the connecting shaft. The sealing component is arranged in the gap. The sealing component is used to improve the sealing between the connecting shaft and the mounting seat.

[0023] By adopting the above technical solution, the sealing component can achieve a sealing effect and ensure the sealing inside the furnace.

[0024] Optionally, the output shaft of the driving member is threadedly connected to the connecting shaft, and the adapter is threadedly connected to the connecting shaft.

[0025] By adopting the above technical solution, the flexibility of the overall structure is improved, making it easier to assemble, disassemble and replace.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application provides an automatic advance and retreat mechanism for a heat shield of a furnace door for a vacuum resistance furnace, which includes a driving assembly. Specifically, the cylinder is first selected according to the movable distance of the heat shield of the furnace door in the furnace chamber and the required driving force, and the selected cylinder is fixed to the cylinder seat through a connecting screw, and then the cylinder shaft is connected to one end of the connecting shaft through a thread, and the other end of the connecting shaft is connected to the adapter seat through a thread, and the adapter seat and the heat shield of the furnace door are connected as a whole through screws. Before the start of heating, the heat shield of the furnace door is driven by the cylinder to move forward along the roller guide rail. After moving to the right position, the heat shield of the furnace door and the heat shield of the furnace body form a relatively closed space, thereby achieving an excellent insulation effect during the heating process. After the heating is completed, the graphite heater is disconnected from heating. When the furnace chamber is naturally cooled to a specified temperature, the heat shield of the furnace door is driven by the cylinder to move backward along the roller guide rail, so that the heat shield of the furnace door and the heat shield of the furnace body are pulled apart to a specified distance, and the heat inside the heat shield is accelerated to dissipate, thereby achieving the purpose of accelerating natural cooling. In this way, the cooling speed under natural cooling conditions can be accelerated and production efficiency can be improved; 2. The present application also provides a guide assembly, a heat shield bracket is installed on the heat shield of the furnace door, the bracket is connected to the roller bracket by screws, and the roller is installed on the roller bracket by a mandrel and a roller baffle. After determining the moving distance of the heat shield of the furnace door, the position of the guide rail seat and the diagonal rib can be determined, and then the guide rail seat and the diagonal rib are welded and fixed to the corresponding position on the furnace door. In this way, when the driving assembly drives the heat shield of the furnace door to move, the stability of the heat shield of the furnace door during movement can be improved under the action of the guide assembly.

[0027] 3. In the present application, considering that factors such as welding deformation may easily cause deviations in the parallelism of the guide rail seat, thereby affecting the smoothness of the translation of the furnace door heat insulation screen, an adjustable guide rail is installed on the guide rail seat. The position of the adjustable guide rail can be fine-tuned by a screw and a locking nut to ensure the position accuracy and parallelism of the guide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall installation of the automatic advance and retreat mechanism of the heat insulation screen of the furnace door for the vacuum resistance furnace in the present application; Figure 2 It is a schematic diagram of the installation of the automatic advance and retreat mechanism of the heat insulation screen of the furnace door for the vacuum resistance furnace and the heat insulation screen of the furnace door in the present application; Figure 3 is a schematic diagram of the structure of the drive assembly in this application; Figure 4 It is a structural schematic diagram of the guide component in this application.

[0029] Explanation of the reference numerals: 1. heat insulation screen for furnace door; 2. furnace door; 3. driving assembly; 31. driving member; 32. mounting seat; 33. connecting shaft; 34. adapter seat; 4. guide assembly; 41. fixing portion; 411. base; 4111. guide rail seat; 4112. adjustable guide rail; 4113. screw; 4114. locking nut; 412. front baffle; 413. rear baffle; 414. side baffle; 415. oblique rib; 42. sliding portion; 421. heat insulation screen bracket; 422. mounting bracket; 423. roller; 5. sealing assembly. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The present application embodiment discloses an automatic advance and retreat mechanism for a heat insulation screen of a vacuum resistance furnace door, referring to Figure 1 and Figure 2 The automatic advance and retreat mechanism of the heat insulation screen of the furnace door for vacuum resistance furnace includes a driving component 3 and a guiding component 4. The driving component 3 is used to drive the heat insulation screen 1 of the furnace door to move toward or away from the heat insulation screen of the furnace body, and the guiding component 4 is used to guide the heat insulation screen 1 of the furnace door.

[0032] Before the start of heating, the drive component 3 drives the furnace door heat shield 1 to move towards the furnace body heat shield. Under the action of the guide component 4, the accuracy and stability of the furnace door heat shield 1 during movement are ensured, and the furnace door heat shield 1 and the furnace body heat shield form a relatively closed space, thereby achieving excellent insulation effect during the heating process. After the heating is completed, when the furnace naturally cools down to the specified temperature, the drive component 3 drives the furnace door heat shield 1 to move away from the furnace body heat shield, and the furnace door heat shield 1 and the furnace body heat shield are pulled apart to the specified distance, so that the internal heat can be dissipated faster, thereby achieving the purpose of accelerating natural cooling. In this way, the cooling speed under natural cooling conditions is accelerated, and production efficiency is improved.

[0033] Specifically, refer to Figure 2 and Figure 3The driving assembly 3 includes a driving member 31, a mounting seat 32, a connecting shaft 33 and an adapter seat 34. The mounting seat 32 is welded to the inner and outer heads of the furnace door 2 of the vacuum resistance furnace. The driving member 31 is connected to the mounting seat 32 by screws. The driving member 31 drives the furnace door heat insulation screen 1 to move toward or away from the mounting seat 32. The adapter seat 34 is connected to the driving member 31 by the connecting shaft 33, and the furnace door heat insulation screen 1 is installed on the adapter seat 34. Before the temperature rises, the driving member 31 drives the furnace door heat insulation screen 1 to move away from the mounting seat 32 through the connecting shaft 33. After the temperature rise is completed, when the furnace chamber naturally cools down to the specified temperature, the driving member 31 drives the furnace door heat insulation screen 1 to move toward the mounting seat 32, so that the furnace door heat insulation screen 1 can be moved to the corresponding position as needed.

[0034] In this embodiment, the driving member 31 can be a cylinder, an electric push rod, etc., preferably a cylinder. The appropriate type of cylinder can be determined according to the movable distance of the furnace door insulation screen 1 in the furnace and the required driving force to meet the working requirements.

[0035] To improve the sealing performance, refer to Figure 2 and Figure 3 A sealing component 5 is also provided. There is a gap between the mounting seat 32 and the connecting shaft 33. The sealing component 5 is provided in the gap. The sealing component 5 is used to improve the sealing between the connecting shaft 33 and the mounting seat 32. The sealing component 5 can play a sealing effect and ensure the sealing in the furnace.

[0036] Specifically, the sealing assembly 5 includes a compression ring, a sealing ring and a compression nut. The sealing ring is installed between the mounting seat 32 and the outer diameter of the connecting shaft 33. The sealing ring is deformed under the extrusion of the compression nut and the compression ring, thereby achieving a sealing effect. It should be noted that in this embodiment, the compression ring, the sealing ring and the compression nut are not shown.

[0037] The output shaft of the driving member 31 is threadedly connected to the connecting shaft 33, and the adapter 34 is threadedly connected to the connecting shaft 33. This improves the flexibility of the overall structure and facilitates assembly, disassembly and replacement. Of course, other connection methods can also be used according to actual conditions, such as screw connection and snap connection.

[0038] Further, refer to Figure 2 and Figure 4 The guide assembly 4 includes a fixed portion 41 and a sliding portion 42. The fixed portion 41 is connected to the furnace door 2 of the empty resistance furnace, and the sliding portion 42 is connected to the furnace door heat insulation screen 1. The sliding portion 42 is slidably connected to the fixed portion 41. When the furnace door heat insulation screen 1 moves, the sliding portion 42 moves in a directional manner on the fixed portion 41. On the one hand, the fixed portion 41 plays a supporting role. On the other hand, the sliding cooperation between the fixed portion 41 and the sliding portion 42 can achieve the purpose of guidance, so that the stability of the furnace door heat insulation screen 1 when moving can be improved.

[0039] Reference Figure 2 and Figure 4 The fixing part 41 includes a base 411, which is mounted on the furnace door 2. The sliding part 42 includes a heat shield bracket 421, a mounting frame 422 and a roller 423. The heat shield bracket 421 is connected to the furnace door heat shield 1, the mounting frame 422 is connected to the heat shield bracket 421, and the roller 423 is mounted on the mounting frame 422. The roller 423 rolls on the base 411. When the driving member 31 drives the furnace door heat shield 1 to move, the roller 423 rolls on the base 411, plays a supporting and guiding role, and ensures stability during the movement.

[0040] Among them, refer to Figure 2 and Figure 4 The base 411 includes a guide rail seat 4111, an adjustable guide rail 4112, a screw 4113 and a locking nut 4114. The guide rail seat 4111 is connected to the furnace door 2, and the adjustable guide rail 4112 is connected to the guide rail seat 4111 through the screw 4113. The locking nut 4114 is screwed on the screw 4113 and is located below the adjustable guide rail 4112. Considering that the parallelism of the guide rail seat 4111 is easily deviated due to factors such as welding deformation, thereby affecting the smoothness of translation of the furnace door heat insulation screen 1, an adjustable guide rail 4112 is installed on the guide rail seat 4111, and the position of the adjustable guide rail 4112 can be fine-tuned through the screw 4113 and the locking nut 4114, thereby ensuring the position accuracy and parallelism of the guide rail.

[0041] In this embodiment, two screw rods 4113 are provided, and four locking nuts 4114 are provided. One screw rod 4113 corresponds to two locking nuts 4114. The two locking nuts 4114 are located at the upper and lower sides of the adjustable guide rail 4112, and the two screw rods 4113 are spaced apart. The two screw rods 4113 can be used to more conveniently and accurately adjust the angle of the adjustable guide rail 4112, so that the screw rods 4113 and the locking nuts 4114 can be used to adjust not only the height but also the angle, which is more flexible and more practical. At the same time, the two locking nuts 4114 can ensure the stability of the adjustable guide rail 4112. Reference Figure 2 and Figure 4 The fixing part 41 further includes a front baffle 412 and a rear baffle 413, both of which are arranged on the adjustable guide rail 4112 and located at different ends, and the roller 423 moves between the front baffle 412 and the rear baffle 413. The front baffle 412 and the rear baffle 413 play the role of safety limit, preventing the movement distance of the furnace door heat insulation screen 1 from exceeding the range, and playing the role of safety protection.

[0042] Reference Figure 2 and Figure 4The fixing part 41 further includes a side baffle 414, which is located on one side of the adjustable guide rail 4112 close to the furnace door heat insulation screen 1, and is arranged along the length direction of the adjustable guide rail 4112. The side baffle 414 plays a blocking role and also plays a limiting role, which plays a role in preventing the insulation layer from moving left and right.

[0043] In this embodiment, the fixing portion 41 further includes an oblique rib 415, and the oblique rib 415 is connected to the guide rail seat 4111. After the moving distance of the furnace door heat insulation screen 1 is determined, the oblique rib 415 can be fixed, and the oblique rib 415 can play a reinforcing role.

[0044] According to actual conditions, multiple guide assemblies 4 can be provided, and the multiple guide assemblies 4 are symmetrically distributed about the furnace door heat insulation screen 1. In this embodiment, four guide assemblies 4 are provided, and the four guide assemblies 4 are arranged in a rectangular shape. When the furnace door heat insulation screen 1 moves, the accuracy of the forward or backward movement direction of the furnace door heat insulation screen 1 and the stability during the movement can be further ensured.

[0045] In a specific application scenario, graphite felt is used as a heat shield inside the furnace, and a graphite heater and a muffle box are installed in the space area surrounded by the heat shield, and the workpieces are stacked in the muffle box. First, the cylinder is selected according to the movable distance of the furnace door heat shield 1 in the furnace and the required driving force, and the selected cylinder is fixed to the cylinder seat through the connecting screw 4113, and then the cylinder shaft is connected to one end of the connecting shaft 33 through a thread, and the other end of the connecting shaft 33 is connected to the adapter 34 through a thread, and the adapter 34 and the furnace door heat shield 1 are connected as a whole through screws.

[0046] Before the temperature rises, the heat shield 1 of the furnace door 2 is driven by the cylinder to move forward along the guide rail of the roller 423. After moving to the right position, the heat shield 1 of the furnace door 2 and the heat shield of the furnace body form a relatively closed space, thereby achieving excellent insulation effect during the temperature rise process.

[0047] After the heating is completed, the graphite heater is disconnected from heating. When the furnace chamber naturally cools down to the specified temperature, the furnace door heat insulation screen 1 is driven by the cylinder to move backward along the roller 423 guide rail, so that the furnace door heat insulation screen 1 and the furnace body heat insulation screen are pulled apart to a specified distance, and the heat inside the heat insulation screen is accelerated to dissipate, thereby achieving the purpose of accelerating natural cooling.

[0048] The implementation principle of the automatic advance and retreat mechanism of the heat shield for the furnace door of the vacuum resistance furnace in the embodiment of the present application is as follows: during installation, after determining the moving distance of the heat shield 1 for the furnace door, the positions of the guide rail seat 4111 and the oblique rib 415 can be determined, and the guide rail seat 4111 and the oblique rib 415 are welded and fixed to the furnace door 2; the horizontality is adjusted by the adjustable guide rail 4112, the screw 4113 and the locking nut 4114, and the heat shield 1 for the furnace door is connected to the heat shield bracket 421. Before the temperature rises, the driving member 31 drives the heat shield 1 for the furnace door to move away from the mounting seat 32 through the connecting shaft 33, and the roller 423 moves in a directional manner on the adjustable guide rail 4112, ensuring that the heat shield 1 for the furnace door and the heat shield for the furnace body can form a relatively closed space, thereby achieving an excellent heat preservation effect during the temperature rise process. After the heating is completed, when the furnace naturally cools down to the specified temperature, the driving member 31 drives the furnace door heat insulation screen 1 to move toward the mounting seat 32, and the furnace door heat insulation screen 1 is pulled away from the furnace body heat insulation screen to a specified distance, so that the internal heat can be dissipated faster, thereby achieving the purpose of accelerating natural cooling. In this way, the cooling speed under the natural cooling condition is accelerated, and the production efficiency is improved.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic advance and retreat mechanism for a heat insulation screen of a vacuum resistance furnace door, characterized in that: The invention comprises a driving member (31), a mounting seat (32), a connecting shaft (33), an adapter seat (34) and a guide assembly (4); the mounting seat (32) is welded to the inner and outer heads of a furnace door (2) of a vacuum resistance furnace; the driving member (31) is fixed on the mounting seat (32); the adapter seat (34) is connected to the driving member (31) via the connecting shaft (33); the driving member (31) drives the furnace door heat insulation screen (1) to move in a direction close to or away from the mounting seat (32); and the furnace door heat insulation screen (1) is mounted on the adapter seat (34); The guide assembly (4) is used to guide the furnace door heat insulation screen (1), and the guide assembly (4) comprises a fixed portion (41) and a sliding portion (42), the fixed portion (41) is connected to the furnace door (2) of the vacuum resistance furnace, the sliding portion (42) is connected to the furnace door heat insulation screen (1), and the sliding portion (42) is slidably connected to the fixed portion (41).

2. The automatic advance and retreat mechanism for the heat insulation screen of the vacuum resistance furnace door according to claim 1 is characterized in that: The fixing portion (41) comprises a base (411), wherein the base (411) is mounted on the furnace door (2); the sliding portion (42) comprises a heat insulation screen bracket (421), a mounting frame (422) and a roller (423); the heat insulation screen bracket (421) is connected to the furnace door heat insulation screen (1); the mounting frame (422) is connected to the heat insulation screen bracket (421); the roller (423) is mounted on the mounting frame (422); and the roller (423) rolls on the base (411).

3. The automatic advance and retreat mechanism of the heat insulation screen for the vacuum resistance furnace door according to claim 2 is characterized in that: The base (411) comprises a guide rail seat (4111), an adjustable guide rail (4112), a screw rod (4113) and a locking nut (4114); the guide rail seat (4111) is connected to the furnace door (2); the adjustable guide rail (4112) is connected to the guide rail seat (4111) via the screw rod (4113); and the locking nut (4114) is screwed onto the screw rod (4113) and is located below the adjustable guide rail (4112).

4. The automatic advance and retreat mechanism for the heat insulation screen of the vacuum resistance furnace door according to claim 3 is characterized in that: The fixing portion (41) further comprises a front baffle (412) and a rear baffle (413), wherein the front baffle (412) and the rear baffle (413) are both arranged on the adjustable guide rail (4112) and located at different ends, and the roller (423) moves between the front baffle (412) and the rear baffle (413).

5. The automatic advance and retreat mechanism of the heat insulation screen for the vacuum resistance furnace door according to claim 3 is characterized in that: The fixing portion (41) further comprises a side baffle (414), wherein the side baffle (414) is located on a side of the adjustable guide rail (4112) close to the furnace door heat insulation screen (1), and the side baffle (414) is arranged along the length direction of the adjustable guide rail (4112).

6. The automatic advance and retreat mechanism for the heat insulation screen of the vacuum resistance furnace door according to claim 3 is characterized in that: There are two screw rods (4113) and four locking nuts (4114), one screw rod (4113) corresponds to two locking nuts (4114), the two locking nuts (4114) are located on the upper and lower sides of the adjustable guide rail (4112), and the two screw rods (4113) are spaced apart.

7. The automatic advance and retreat mechanism of the heat insulation screen for the vacuum resistance furnace door according to claim 3 is characterized in that: The fixing portion (41) further comprises an oblique rib (415), and the oblique rib (415) is connected to the guide rail seat (4111).

8. The automatic advance and retreat mechanism for the heat insulation screen of the vacuum resistance furnace door according to claim 1 is characterized in that: A plurality of the guide assemblies (4) are provided, and the plurality of the guide assemblies (4) are symmetrically distributed with respect to the furnace door heat insulation screen (1).

9. The automatic advance and retreat mechanism of the heat insulation screen for the door of the vacuum resistance furnace according to claim 1, characterized in that: It also comprises a sealing component (5); there is a gap between the mounting seat (32) and the connecting shaft (33); the sealing component (5) is arranged in the gap; the sealing component (5) is used to improve the sealing performance between the connecting shaft (33) and the mounting seat (32).

10. The automatic advance and retreat mechanism of the heat insulation screen for the door of the vacuum resistance furnace according to claim 1, characterized in that: The output shaft of the driving member (31) is threadedly connected to the connecting shaft (33), and the adapter seat (34) is threadedly connected to the connecting shaft (33).

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