Vacuum sintering furnace

Abstract

The utility model relates to the technical field of sintering furnaces, and discloses a vacuum sintering furnace which comprises an installation support, the top of the installation support is fixedly connected with a first furnace body, the left side and the right side of the exterior of the first furnace body are both fixedly connected with installation rings, and the four corners of the exterior of each installation ring are each provided with a sealing disassembly and assembly mechanism. The top of the first furnace body is fixedly connected with a pump body, the output end of the pump body is fixedly connected with an air outlet pipe, the outer portion of the air outlet pipe is fixedly connected with a smoke backflow prevention sealing mechanism, the sealing dismounting and mounting mechanism comprises a mounting frame, the inner portion of the mounting frame is fixedly connected with a connecting shaft, and the outer portion of the connecting shaft is rotationally connected with a rotating clamping plate. According to the utility model, the spring I can be deformed, so that the furnace cover can be tightly clamped in the furnace body I, at the moment, the rotating clamping plates on the periphery are rotated, so that the rotating clamping plates are clamped with the clamping grooves in the outer part of the furnace cover, and then the furnace body I can be sealed and fixed at first.

Description

Technical Field

[0001] This utility model relates to the field of sintering furnace technology, and in particular to a vacuum sintering furnace. Background Technology

[0002] By sintering metal powder in a vacuum sintering furnace, high-density, high-performance metal products can be obtained, such as cemented carbide cutting tools and powder metallurgy gears. In a vacuum environment, impurities and gases in the powder can be effectively removed, giving the sintered material better mechanical properties and wear resistance.

[0003] A search revealed Chinese publication number CN220853115U, which describes a vacuum sintering furnace, relating to the field of sintering furnaces. It includes a sintering furnace body with a horizontally arranged threaded ring shell at one end, one end of which is fixedly attached to the end of the furnace body. A furnace cover body is located at the end of the furnace body where the threaded ring shell is installed. The furnace cover body includes an outer shell, which is located at the outer end of the threaded ring shell. A threaded shell is horizontally fixed to the end of the outer shell near the furnace body, and the threaded shell is threaded into the interior of the threaded ring shell. A hollow ceramic plate is fixed inside the threaded shell, and carbon fiber felt is fixed to both ends of the ceramic plate inside the threaded shell. One end of an opening / closing component is fixed to the outer end face of the furnace body, and the other end is fixedly assembled to the other end face of the outer shell. This application prevents heat loss from the interior of the sintering furnace through gaps in the furnace door, improving the overall heat preservation effect of the sintering furnace.

[0004] The patent description mentions that "the insert ring at the end of the threaded ring shell of the furnace cover body, which rotates simultaneously, is inserted into the sealing slot of the threaded ring shell, thereby completing the end closure between the furnace cover body and the sintering furnace body." Poor sealing will cause outside air to continuously seep into the furnace, making it difficult to achieve and maintain the high vacuum required by the process. For example, in sintering processes that require different vacuum levels, poor sealing will cause the actual vacuum level to fail to meet the requirements. In view of the above problems, a vacuum sintering furnace is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a vacuum sintering furnace, which aims to improve the problem that some vacuum sintering furnaces in the prior art cannot be sealed and fixed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a vacuum sintering furnace, including a mounting bracket, a furnace body fixedly connected to the top of the mounting bracket, mounting rings fixedly connected to the left and right sides of the furnace body, sealing and disassembly mechanisms provided at the four corners of the mounting rings, a pump body fixedly connected to the top of the furnace body, an exhaust pipe fixedly connected to the output end of the pump body, and a flue gas backflow prevention sealing mechanism fixedly connected to the outside of the exhaust pipe;

[0007] The sealing and disassembly mechanism includes a mounting frame, a connecting shaft is fixedly connected inside the mounting frame, a rotating clamp is rotatably connected to the outside of the connecting shaft, a furnace cover is slidably connected to the left and right sides of the outside of the furnace body, a limit ring is fixedly connected to the left and right ends inside the furnace body, a reset sealing assembly is provided around the outside of the limit ring, and the mounting frame is fixedly connected to the outside of the mounting ring.

[0008] The above solution utilizes mounting rings on both sides of the furnace body, combined with a sealing and disassembly mechanism, to facilitate the installation and removal of the furnace cover. A connecting shaft on the mounting bracket drives a rotating clamping plate, securing the furnace cover. The limiting ring and reset sealing assembly inside the furnace body work together to ensure a good seal on the furnace cover. The pump body is connected to the exhaust pipe, and a backflow prevention sealing mechanism ensures stable and safe operation of the sintering furnace, improving the sintering effect.

[0009] As a further description of the above technical solution:

[0010] The reset sealing assembly includes a housing, a limiting block is slidably connected inside the housing, a sliding rod is fixedly connected to the outside of the limiting block, a spring is sleeved on the outside of the sliding rod, and the housing is fixedly connected to the outside of the limiting ring.

[0011] With the above solution: the shell is fixed around the limiting ring, the internal limiting block can slide flexibly, the sliding rod connected to the limiting block moves accordingly, and the spring fitted outside the sliding rod is compressed or stretched during the opening and closing of the furnace cover. When the furnace cover is closed, the spring rebounds and pushes the limiting block, so that the furnace cover and the furnace body fit tightly together, achieving a good sealing effect and ensuring the vacuum environment of the sintering furnace.

[0012] As a further description of the above technical solution:

[0013] The outer side of the sliding rod is engaged with the outer side of the furnace cover, and the outer side of the sliding rod is slidably connected to the inside of the housing.

[0014] With the above solution: one end of the sliding rod is tightly locked to the outside of the furnace cover. When the furnace cover is opened and closed, the sliding rod slides flexibly inside the shell under the action of the furnace cover. During this process, the sliding rod and the furnace cover always maintain a stable connection. The spring extends and retracts according to the movement of the furnace cover. After the furnace cover is closed, the spring exerts force, and the sliding rod ensures that the furnace cover and the furnace body are tightly fitted, thus maintaining a stable vacuum environment inside the furnace.

[0015] As a further description of the above technical solution:

[0016] An inner cavity furnace body is fixedly connected to the inside of the furnace body, and the outer side of the inner cavity furnace body is fixedly connected to the inside of the limiting ring.

[0017] With the above solution, the inner furnace body and the limiting ring fit tightly together, and it is firmly fixed inside the limiting ring. The limiting ring provides stable support for the inner furnace body, ensuring its stable position inside the furnace. This structural design helps to maintain a stable temperature field and vacuum environment inside the furnace, ensuring that the material is sintered under precise and controlled conditions, thereby improving product quality and sintering efficiency.

[0018] As a further description of the above technical solution:

[0019] The anti-smoke backflow sealing mechanism includes a fixed housing, a cross-shaped placement plate fixedly connected inside the fixed housing, a placement housing fixedly connected outside the cross-shaped placement plate, a sliding rod II slidably connected inside the placement housing, a spring II sleeved outside the sliding rod II, a sealing plate fixedly connected to the other end of the spring II, a sealing assembly fixedly connected inside the fixed housing, a fixed docking ring fixedly connected outside the fixed housing, and the outside of the fixed housing fixedly connected to the outside of the exhaust pipe.

[0020] The above scheme involves a fixed housing installed outside the exhaust pipe, an internal cross-shaped plate supporting the housing, a sliding rod sliding inside the housing, and a spring connected to a sealing plate. When airflow passes through, the sealing plate moves under the action of the spring, regulating the airflow. At the same time, the sealing assembly and the fixed docking ring further ensure the sealing effect, effectively preventing flue gas backflow and ensuring the normal operation of the sintering furnace.

[0021] As a further description of the above technical solution:

[0022] The sealing assembly includes a sealing ring, the outer side of which is fitted against the outer side of the sealing plate, and the outer side of the sealing ring is fixedly connected to the interior of the fixed housing.

[0023] With the above solution: the sealing ring is firmly fixed inside the fixed shell, and its exterior is tightly fitted with the sealing plate. When the sintering furnace is working and there is airflow in the gas outlet pipe, the sealing plate moves under the action of the second spring, and the degree of fit with the sealing ring will change accordingly, always maintaining tight contact, thereby effectively blocking the backflow of flue gas and ensuring the sealing and stability of the entire sintering process.

[0024] As a further description of the above technical solution:

[0025] The sealing plate is externally slidably connected to the inside of the fixed housing, and the sliding rod 2 is externally slidably connected to the inside of the fixed housing.

[0026] Through the above scheme, the operation of the sealing plate and the second sliding rod is crucial. The sealing plate slides flexibly within the fixed housing to precisely adjust the size of the airflow channel, while the second sliding rod also slides smoothly within the fixed housing to provide stable support and guidance for the sealing plate. The two work together to respond quickly when airflow passes through the outlet pipe in the furnace, and precisely adjust the sealing state according to the change in air pressure to effectively prevent flue gas backflow.

[0027] As a further description of the above technical solution:

[0028] One end of the second spring is fixedly connected to the outside of the sealing plate, and the other end of the second spring is fixedly connected to the inside of the housing.

[0029] Through the above scheme, spring two plays a crucial role. One end is firmly fixed to the outside of the sealing plate, and the other end is securely connected to the inside of the housing. When the gas flow in the furnace impacts the sealing plate, spring two is stretched and contracted under force, precisely controlling the movement of the sealing plate. When the gas pressure in the furnace is stable, spring two maintains appropriate tension, allowing the sealing plate to fit tightly against the sealing ring, preventing flue gas backflow and ensuring the stable operation of the sintering furnace.

[0030] This utility model has the following beneficial effects:

[0031] 1. In this utility model, the mounting bracket presses the sliding rod, causing the sliding rod to slide inside the housing, which in turn causes the spring to deform, allowing the furnace cover to be tightly locked inside the furnace body. At this time, by rotating the rotating plates around the perimeter, the rotating plates are locked with the slots on the outside of the furnace cover, thus firstly sealing and fixing the furnace body.

[0032] 2. In this utility model, the gas compresses the sealing plate, which then slides inside the housing via the sliding rod two, causing the spring two to deform. At this moment, the flue gas is discharged from the inside of the anti-smoke gas backflow sealing mechanism through the cross placement plate. When the flue gas stops being discharged, the spring two rebounds, causing the sealing plate to fit against the sealing ring inside the fixed housing, thereby achieving gas backflow prevention. Attached Figure Description

[0033] Figure 1 This is a three-dimensional schematic diagram of a vacuum sintering furnace proposed in this utility model;

[0034] Figure 2 This is a schematic diagram of the structure of a limiting ring for a vacuum sintering furnace proposed in this utility model;

[0035] Figure 3 This is a schematic diagram of the structure of a vacuum sintering furnace body according to the present invention;

[0036] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0037] Legend:

[0038] 1. Mounting bracket; 2. Furnace body one; 3. Mounting ring; 4. Sealing disassembly and assembly mechanism; 401. Mounting bracket; 402. Connecting shaft; 403. Rotating clamping plate; 404. Furnace cover; 405. Limiting ring; 406. Housing one; 407. Limiting block; 408. Sliding rod one; 409. Spring one; 5. Inner cavity furnace body; 6. Pump body; 7. Gas outlet pipe; 8. Anti-smoke gas backflow sealing mechanism; 801. Fixed housing; 802. Cross placement plate; 803. Placement housing; 804. Sliding rod two; 805. Spring two; 806. Sealing plate; 807. Sealing ring; 9. Fixed docking ring. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] Reference Figures 1 to 3 This utility model provides an embodiment of a vacuum sintering furnace, including a mounting bracket 1. The mounting bracket 1 is the basic support structure of the entire vacuum sintering furnace. It undergoes rigorous welding processes and quality inspections to ensure sufficient strength and stability to withstand the weight of the furnace body 2 and other auxiliary equipment. The furnace body 2 is fixedly connected to the top of the mounting bracket 1. The furnace body 2 is the core part of the vacuum sintering furnace, used to contain the material to be sintered. It has good high-temperature resistance and corrosion resistance. The interior of the furnace body 2 undergoes fine polishing to reduce heat loss and impurity adsorption. The furnace body 2 is typically cylindrical, and its diameter is determined according to the requirements of the sintering process and the size of the material being processed. The exterior of the furnace body 2... Mounting rings 3 are fixedly connected to both the left and right sides of the furnace body 2. The function of mounting rings 3 is to provide a mounting base for the sealing disassembly mechanism 4 and to enhance the structural strength of the furnace body 2. Sealing disassembly mechanisms 4 are set at the four corners of the outer side of mounting rings 3. A pump body 6 is fixedly connected to the top of the furnace body 2. The pump body 6 usually adopts a high-performance vacuum pump, such as a rotary vane pump, which has the characteristics of fast pumping speed and high vacuum degree. The power of the pump body 6 is selected according to the volume of the furnace body 2 and the required vacuum degree. An exhaust pipe 7 is fixedly connected to the output end of the pump body 6. The length of the exhaust pipe 7 is adjusted according to the layout of the equipment and the installation space. The surface is polished to reduce the resistance of gas flow. An anti-smoke gas backflow sealing mechanism 8 is fixedly connected to the outside of the exhaust pipe 7.

[0041] The anti-smoke backflow sealing mechanism 8 includes a fixed housing 801. A cross-shaped placement plate 802 is fixedly connected inside the fixed housing 801. The cross-shaped placement plate 802 provides support and fixation for the placement housing 803. The placement housing 803 is cylindrical in shape, and its inner diameter is designed according to the size of the sliding rod 804. The sliding rod 804 is slidably connected inside the placement housing 803. A spring 805 is sleeved on the outside of the sliding rod 804. The outer diameter of the spring 805 is designed according to the inner diameter of the placement housing 803. A sealing plate 806 is fixedly connected to the other end of the spring 805. A sealing assembly is fixedly connected inside the fixed housing 801. The component includes a sealing ring 807, the outer side of which is in contact with the outer side of the sealing plate 806. When the gas is discharged normally, the sealing plate 806 compresses the second spring 805 under the action of gas pressure and moves upward, allowing the gas to pass through. When flue gas backflow occurs, the elastic force of the second spring 805 pushes the sealing plate 806 downward, making it tightly in contact with the sealing ring 807, thereby preventing flue gas from backflowing into the furnace body 2. The outer side of the sealing ring 807 is fixedly connected to the inside of the fixed housing 801. The fixed housing 801 is fixedly connected to the outside of the fixed docking ring 9. The function of the fixed docking ring 9 is to facilitate the docking and installation of the anti-flue gas backflow sealing mechanism 8 with other pipes or equipment. The outside of the fixed housing 801 is fixedly connected to the outside of the gas outlet pipe 7.

[0042] Specifically, during the construction of the vacuum sintering furnace, the mounting bracket 1, which has undergone strict welding and quality inspection and meets the standards for strength and stability, is first placed in position. The core furnace body 2 is fixed on the top of the bracket. The furnace body 2 is high temperature resistant and corrosion resistant, and the interior is polished. The diameter is determined according to the sintering process and material size. The furnace body 2 is equipped with rings 3 on both sides and external sealing disassembly and assembly mechanisms 4. The top is connected to a high-performance vacuum pump body 6 selected according to the furnace volume and vacuum degree. The output end of the pump body 6 is connected to a polished exhaust pipe 7 with an adjusted length according to the layout. The exhaust pipe 7 is externally connected to a flue gas backflow prevention sealing mechanism 8. The cross placement plate 802 inside the mechanism supports the placement shell 803. The sliding rod 804 is fitted with a spring 805 and connected to the sealing plate 806, which cooperates with the sealing ring 807. During normal exhaust, the sealing plate 806 moves upward. When the flue gas backflows, the spring 805 pushes it to fit against the sealing ring 807 to prevent flue gas backflow. The fixed docking ring 9 facilitates the docking and installation of the mechanism with other components.

[0043] Reference Figures 2 to 3The sealing and disassembly mechanism 4 includes a mounting frame 401. The height of the vertical part of the mounting frame 401 is determined according to the rotation space of the connecting shaft 402 and the rotating plate 403. It is used to install the connecting shaft 402. The connecting shaft 402 is fixedly connected inside the mounting frame 401. The connecting shaft 402 is cylindrical and its length is slightly longer than the width of the vertical part of the mounting frame 401 to ensure the smoothness of the rotating plate 403 when it rotates around it and reduce friction loss. The rotating plate 403 is rotatably connected to the outside of the connecting shaft 402. The other end of the rotating plate 403 is designed with a structure for clamping or loosening the furnace cover 404, such as a slot or a protrusion. By rotating the rotating plate 403, the fixing and disassembly operations of the furnace cover 404 can be realized.

[0044] Furnace covers 404 are slidably connected to the left and right sides of the exterior of furnace body 2. The shape of the furnace cover 404 is adapted to the opening of furnace body 2, and its size is slightly larger than the opening of furnace body 2 to ensure a good sealing effect. Limiting rings 405 are fixedly connected to the left and right ends of the interior of furnace body 2. The function of the limiting rings 405 is to provide an installation base for the reset sealing assembly and to limit the closed position of the furnace cover 404 to ensure the accuracy and sealing of the furnace cover 404 when closed. Reset sealing assemblies are provided around the exterior of the limiting rings 405. The reset sealing assembly includes a housing 406, and a limiting block 407 is slidably connected inside the housing 406. The surface of 7 is anodized to improve its wear resistance and corrosion resistance. A sliding rod 408 is fixedly connected to the outside of the limiting block 407. A spring 409 is sleeved on the outside of the sliding rod 408. When the furnace cover 404 is closed, the furnace cover 404 presses the limiting block 407, causing the sliding rod 408 to compress the spring 409. When the furnace cover 404 is opened, the elastic force of the spring 409 pushes the limiting block 407 and the sliding rod 408 to reset, thereby realizing the sealing and reset function of the furnace cover 404. The outer shell 406 is fixedly connected to the outside of the limiting ring 405. The outer mounting bracket 401 is fixedly connected to the outside of the mounting ring 3.

[0045] Specifically, the vertical height of the mounting bracket 401 is determined by the rotation space of the connecting shaft 402 and the rotating plate 403. The connecting shaft 402 is fixed and is longer than the vertical width of the mounting bracket 401 to ensure smooth rotation of the rotating plate 403. The other end of the connecting shaft 402 is provided with a slot or protrusion, which allows the furnace cover 404 to be fixed and disassembled by rotation. The furnace body 2 is slidably connected to the furnace cover 404, which is slightly larger than the furnace opening. Limiting rings 405 are provided at both ends inside the furnace body 2. Reset sealing components are installed around the limiting rings 405. In the inner shell 406 of the components, the anodized limiting block 407 is connected to the sliding rod 408 and fitted with a spring 409. When the furnace cover 404 is closed, it squeezes the limiting block 407 to compress the spring 409. When the furnace cover 404 is opened, the spring 409 pushes the limiting block 407 and the sliding rod 408 to reset, thus achieving the sealing and reset of the furnace cover 404. All components work together to ensure the normal operation of the furnace body.

[0046] Reference Figures 3 to 4 The outer side of sliding rod 408 is locked to the outer side of furnace cover 404. The outer side of sliding rod 408 is slidably connected to the inside of shell 406. The inner cavity furnace body 5 is fixedly connected to the inside of furnace body 2. The inner cavity furnace body 5 is the core area for sintering in the vacuum sintering furnace. The outer side of the inner cavity furnace body 5 is fixedly connected to the inside of limiting ring 405. The outer side of sealing plate 806 is slidably connected to the inside of fixed shell 801. The outer side of sliding rod 804 is slidably connected to the inside of fixed shell 801. One end of spring 805 is fixedly connected to the outside of sealing plate 806, and the other end of spring 805... Fixedly connected inside the housing 803, when gas is normally discharged from the outlet pipe 7, the gas pressure pushes the sealing plate 806 to compress the second spring 805, causing the sealing plate 806 to slide upward, allowing the gas to pass smoothly. When flue gas backflow occurs, the gas pressure direction changes, and the elastic force of the second spring 805 pushes the sealing plate 806 downward, making it tightly fit with the sealing ring 807, thereby effectively preventing flue gas from backflowing into the furnace body 2. The elastic coefficient of the second spring 805 has been precisely calculated and adjusted to ensure reliable sealing and opening functions under different gas pressure conditions.

[0047] Specifically, during the operation of the vacuum sintering furnace, when the furnace cover 404 is closed, the externally clamped sliding rod 408 pushes the limiting block 407 to compress the spring 409, achieving a seal. When opening, the spring 409 pushes the limiting block 407 and the sliding rod 408 back to their original positions. The fixed inner cavity furnace body 5 inside the furnace body 2 is the core sintering area. At the gas outlet pipe 7, when gas is normally discharged, the pressure pushes the sealing plate 806 to compress the spring 805 and slide it upward, allowing the gas to pass smoothly. Once flue gas backflow occurs, the gas pressure reverses, and the spring 805, with its precisely adjusted elastic coefficient, pushes the sealing plate 806 to slide downward, tightly fitting with the sealing ring 807, effectively preventing flue gas from flowing back into the furnace body 2, ensuring a stable vacuum environment inside the furnace, and facilitating the normal operation of the sintering process.

[0048] Working principle: When sealing and fixing the furnace body 2, firstly, by placing the furnace cover 404 inside the furnace body 2, the groove on the outside of the furnace body 2 is locked with the sliding rod 408. Then, by pushing the mounting bracket 401, the mounting bracket 401 is pressed against the sliding rod 408, causing the sliding rod 408 to slide inside the housing 406. This causes the spring 409 to deform, allowing the furnace cover 404 to be tightly locked inside the furnace body 2. At this time, by rotating the rotating plate 403 around the furnace body, the rotating plate 403 is locked with the slot on the outside of the furnace cover 404, thus sealing and fixing the furnace body 2.

[0049] When preventing backflow of flue gas, the gas compresses the sealing plate 806, which then slides inside the housing 803 via the sliding rod 804. This causes the spring 805 to deform, allowing the flue gas to exit through the cross-shaped placement plate 802 from the inside of the anti-backflow sealing mechanism 8. When the flue gas stops being discharged, the spring 805 rebounds, causing the sealing plate 806 to come into contact with the sealing ring 807 inside the fixed housing 801, thus preventing backflow of gas.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum sintering furnace, comprising a mounting bracket (1), characterized in that: The top of the mounting bracket (1) is fixedly connected to the furnace body (2), and the left and right sides of the furnace body (2) are fixedly connected to the mounting rings (3). The four corners of the mounting rings (3) are provided with sealing disassembly and assembly mechanisms (4). The top of the furnace body (2) is fixedly connected to the pump body (6), and the output end of the pump body (6) is fixedly connected to the gas outlet pipe (7). The outside of the gas outlet pipe (7) is fixedly connected to the anti-smoke gas backflow sealing mechanism (8). The sealing disassembly and assembly mechanism (4) includes a mounting bracket (401), a connecting shaft (402) is fixedly connected inside the mounting bracket (401), a rotating clamp (403) is rotatably connected to the outside of the connecting shaft (402), a furnace cover (404) is slidably connected to the left and right sides of the furnace body (2), a limit ring (405) is fixedly connected to the left and right ends inside the furnace body (2), a reset sealing assembly is provided around the outside of the limit ring (405), and the outside of the mounting bracket (401) is fixedly connected to the outside of the mounting ring (3).

2. The vacuum sintering furnace according to claim 1, characterized in that: The reset sealing assembly includes a housing (406), a limiting block (407) is slidably connected inside the housing (406), a sliding rod (408) is fixedly connected to the outside of the limiting block (407), a spring (409) is sleeved on the outside of the sliding rod (408), and the outside of the housing (406) is fixedly connected to the periphery of the limiting ring (405).

3. A vacuum sintering furnace according to claim 2, characterized in that: The outside of the sliding rod (408) is engaged with the outside of the furnace cover (404), and the outside of the sliding rod (408) is slidably connected to the inside of the housing (406).

4. A vacuum sintering furnace according to claim 2, characterized in that: The furnace body 1 (2) is fixedly connected to the inner cavity furnace body (5), and the outer side of the inner cavity furnace body (5) is fixedly connected to the inside of the limiting ring (405).

5. A vacuum sintering furnace according to claim 1, characterized in that: The anti-smoke gas backflow sealing mechanism (8) includes a fixed housing (801), a cross placement plate (802) is fixedly connected inside the fixed housing (801), a placement housing (803) is fixedly connected outside the cross placement plate (802), a sliding rod (804) is slidably connected inside the placement housing (803), a spring (805) is sleeved on the outside of the sliding rod (804), a sealing plate (806) is fixedly connected to the other end of the spring (805), a sealing assembly is fixedly connected inside the fixed housing (801), a fixed docking ring (9) is fixedly connected outside the fixed housing (801), and the outside of the fixed housing (801) is fixedly connected to the outside of the exhaust pipe (7).

6. A vacuum sintering furnace according to claim 5, characterized in that: The sealing assembly includes a sealing ring (807), the outside of which is in contact with the outside of the sealing plate (806), and the outside of which is fixedly connected to the inside of the fixed housing (801).

7. A vacuum sintering furnace according to claim 6, characterized in that: The sealing plate (806) is externally slidably connected to the inside of the fixed housing (801), and the sliding rod (804) is externally slidably connected to the inside of the fixed housing (801).

8. A vacuum sintering furnace according to claim 5, characterized in that: One end of the second spring (805) is fixedly connected to the outside of the sealing plate (806), and the other end of the second spring (805) is fixedly connected to the inside of the housing (803).

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