A plug valve device for an equiaxed crystal vacuum precision casting furnace

Abstract

The utility model relates to a plug valve device for equiaxed crystal vacuum precision casting furnace belongs to vacuum melting equipment technical field. The device aims at solving the poor sealing reliability, big operating moment, easy to jam and inconvenient maintenance and other problems existing under high temperature, high pressure and vacuum environment of existing plug valve. The core innovation is integrated with efficient water cooling system, multifunctional reuse interface and optimized sealing and driving structure. The device mainly includes upper mounting seat, lower mounting seat, plug valve main part, sealing system and cooling system. The plug valve main part is driven by the cylinder to move horizontally, realizes the isolation and intercommunication of smelting chamber and charging cabin or temperature measuring mechanism. The cooling water flow channel is integrated in the valve plate inside and around the valve seat, effectively inhibits the high temperature thermal deformation. The utility model has the advantages of excellent sealing performance, convenient operation, heat resistance, convenient maintenance and the like, significantly improves the continuous operation efficiency and reliability of equiaxed crystal vacuum precision casting furnace.

Description

Technical Field

[0001] This utility model relates to the field of vacuum metallurgy and precision casting equipment technology, and in particular to a gate valve device for an equiaxed crystal vacuum precision casting furnace, especially a key isolation component for an equiaxed crystal vacuum precision casting furnace, specifically a gate valve device with efficient cooling, functional reuse and highly reliable sealing characteristics. Background Technology

[0002] Equiaxed crystal vacuum precision casting technology is a core process for producing high-performance nickel-based superalloys, titanium-aluminum intermetallic compounds, and other advanced material castings. This process requires extremely high vacuum levels (e.g., 10⁻⁶). -3 Pa to 10 -5 Melting and casting are carried out in environments with high temperatures (typically exceeding 1500°C) to ensure material purity and grain refinement. During this process, the melting chamber needs frequent and reliable isolation and communication with external feeding chambers, temperature sampling mechanisms, etc. The gate valve, as a key component in achieving this function, directly affects the operational stability, production efficiency, and product quality of the entire casting furnace.

[0003] Currently, slide gate valves used in such demanding operating conditions generally suffer from the following technical defects: Insufficient sealing reliability: The sealing surfaces of the valve plate and valve seat are exposed to high-temperature metal vapor and possible particulate media for a long time, which can easily lead to sealing failure due to thermal stress deformation, media erosion or wear, resulting in "internal leakage". Internal leakage can damage the vacuum degree of the melting chamber or the purity of the protective atmosphere, leading to defects such as oxide inclusions in the castings, and even causing safety accidents.

[0004] High operating torque, prone to jamming: In high-temperature environments, the difference in thermal expansion coefficients between the valve plate and valve seat, and other metal components, can easily lead to "thermal jamming," meaning the valve is difficult to reopen after being closed. Traditional slide gate valves mostly use simple pneumatic or manual actuation, resulting in high frictional resistance, inconvenient operation, and the risk of damage to the actuation components.

[0005] Poor cooling performance and short lifespan: Although some existing designs incorporate cooling structures, these are often limited to the valve body and fail to effectively cool the valve plate, a core heat-affected component. The valve plate is prone to creep deformation during repeated thermal cycles, leading to sealing surface mismatch and significantly shortening the valve's service life.

[0006] Single function and complex equipment layout: In order to meet different functions such as feeding and temperature measurement, the melting chamber wall usually needs to be opened with multiple interfaces and equipped with multiple special valves. This not only increases the complexity of the furnace structure and manufacturing cost, but also introduces more potential leakage points.

[0007] Maintenance difficulties: Once the seals or valve plate are damaged, most traditional slide gate valves require complete disassembly for offline maintenance, resulting in long downtime, high maintenance costs, and serious impact on the continuous operation efficiency of the equipment.

[0008] A search revealed several related patents for slide gate valves in the prior art. For example, utility model patent CN217234457U discloses a water-cooled slide gate valve, which incorporates cooling water channels within the valve body and valve plate to reduce operating temperature. However, the cooling water channel design of this patent is relatively simple, lacking optimization of the internal flow channels of the valve plate to improve cooling efficiency, and it does not address the issue of reusing multi-functional interfaces. Another patent, CN220168619U, relates to a high-temperature water-cooled slide gate valve suitable for high-temperature vacuum equipment such as single-crystal furnaces. However, its valve core assembly uses an up-and-down movement mechanism, and the cooling water channel is connected to the valve core via an external pipe. Under frequent operation, the reliability and lifespan of the pipe joints may face challenges. Patent CN210484790U focuses on disclosing a specific structure of a water-cooled valve plate, using a combination of a base plate and a cover plate to form a cooling water channel, providing valuable inspiration for the design of the valve plate in this utility model. However, it also lacks integration of multi-functional interfaces and specific sealing system designs for equiaxed crystal casting furnaces.

[0009] Therefore, there is an urgent need in this field for a gate valve device optimized for the special working conditions of equiaxed crystal vacuum precision casting furnaces. It should be able to solve a series of comprehensive problems such as high-temperature sealing, efficient cooling, easy operation, functional integration and easy maintenance. Utility Model Content

[0010] To address the shortcomings of existing technologies, the purpose of this invention is to provide a gate valve device for equiaxed crystal vacuum precision casting furnaces. This device aims to achieve the following objectives through systematic innovative design: significantly improve sealing reliability and service life in high-temperature, high-vacuum, and particulate media environments; effectively reduce valve opening and closing torque, eliminating "thermal jamming"; enable multiple functions such as feeding and temperature measurement to be reused on a single valve interface, simplifying the furnace structure; and facilitate the replacement of key wear parts, significantly reducing maintenance time and costs.

[0011] The above-mentioned utility model objective is achieved through the following technical solution: This utility model provides a slide gate valve device for an equiaxed crystal vacuum precision casting furnace, including an upper mounting base, a lower mounting base, a slide gate valve body, a sealing system, and a cooling system. The lower mounting base is used for a sealed connection with the inlet of the melting chamber, and the upper mounting base is used for a sealed connection with a feeding chamber or a temperature measuring mechanism. The slide gate valve body is disposed between the upper and lower mounting bases, and has a horizontally movable valve plate and a valve seat that cooperates with the valve plate inside. The slide gate valve body is also provided with a drive unit for driving the valve plate to move. The cooling system includes a first cooling channel formed inside the valve plate and a second cooling channel formed in the valve body around the valve seat. Both the first and second cooling channels are provided with a cooling medium inlet and a cooling medium outlet. The sealing system includes a first sealing ring disposed between the bottom of the lower mounting base and the slide gate valve body, a second sealing ring disposed between the top of the upper mounting base and the slide gate valve body, and a third sealing ring disposed between the upper mounting base and the external chamber.

[0012] According to one embodiment of this utility model, the upper mounting base is a standardized flange interface, and its through hole size is matched with the lower port of the feeding chamber and the measuring port of the temperature measuring mechanism, respectively, so that the feeding chamber or the temperature measuring mechanism can be connected to the upper mounting base by rotation or translation switching, thereby realizing functional reuse.

[0013] According to one embodiment of the present invention, the valve plate is a water-cooled valve plate, which includes a base plate and a cover plate covering the base plate. The side of the base plate facing the cover plate is processed with a channel group forming the first cooling flow channel. The channel group includes multiple interconnected annular water channels and connecting water channels. The cover plate is sealed to the base plate to close the channel group and form a closed flow channel.

[0014] According to one embodiment of the present invention, the side of the substrate is provided with a cooling medium inlet and a cooling medium outlet and is connected to the first cooling channel; a water baffle is provided in the channel group, and the water baffle guides the cooling medium flowing into the cooling medium inlet to circulate in the annular water channel and then flows to the cooling medium outlet.

[0015] According to one embodiment of the present invention, the annular water channel includes an inner water channel, a middle water channel, and an outer water channel. The middle water channel and the outer water channel are further provided with a check block on the side near the cooling medium inlet to optimize the flow path of the cooling medium and prevent short circuits.

[0016] According to one embodiment of the present invention, the driving unit is a cylinder, one end of the piston rod of the cylinder is hinged to the valve plate, and the contact surface between the valve plate and the valve seat is coated with a solid lubricating coating.

[0017] According to one embodiment of the present invention, the valve seat is made of a high-strength nickel-based high-temperature alloy, and its sealing surface is subjected to surface hardening treatment, which is performed by nitriding or spraying a tungsten carbide-based hard coating.

[0018] According to one embodiment of the present invention, the first cooling channel and the second cooling channel are connected by an external pipeline to form a series cooling circuit, or are respectively connected to an independent cooling source to form a parallel cooling circuit; a flow regulating valve and a temperature sensor are provided at the inlet of the cooling medium.

[0019] According to one embodiment of the present invention, the slide gate valve device adopts a modular design as a whole, and the valve plate, valve seat and each sealing ring are modular components that can be independently disassembled and replaced.

[0020] According to one embodiment of the present invention, the connecting surface between the lower mounting base and the main body of the slide gate valve, and the connecting surface between the upper mounting base and the main body of the slide gate valve, are all precision machined, with a flatness error of no more than 0.05 mm and a surface roughness Ra of no more than 0.8 micrometers.

[0021] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects: Superior sealing performance and reliability: Integrated internal cooling of the valve plate and valve seat fundamentally reduces the operating temperature of the main sealing components, effectively resisting thermal deformation and ensuring the fit of the sealing surface under long-term high-temperature conditions. A redundant system composed of multiple sealing rings further enhances sealing reliability and completely eliminates the risk of internal leakage.

[0022] Extremely high ease of operation and reliability: The optimized low-friction drive mechanism, combined with internal cooling of the valve plate, significantly reduces the valve opening and closing torque, fundamentally preventing "thermal jamming." The cylinder buffer device ensures smooth valve operation and reduces impact.

[0023] Innovative functional integration and structural simplification: The standardized design of the upper mounting base enables the reuse of feeding and temperature measurement functions, reduces the number of openings and special valves on the melting chamber, simplifies the furnace structure, and reduces manufacturing costs and potential leakage points.

[0024] Excellent maintainability and long lifespan: The modular design allows for independent and quick replacement of vulnerable parts such as valve plates and seals, without disassembling the entire valve assembly, significantly reducing maintenance downtime. The efficient cooling system significantly extends the valve's service life.

[0025] Wide range of applications: Although this utility model is designed for equiaxed crystal vacuum precision casting furnaces, its technical concept is also applicable to other industrial fields that require high temperature and high vacuum isolation, such as single crystal silicon growth furnaces, photovoltaic equipment, and manufacturing of hot-end components for aerospace engines, and has good promotional value. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0027] Figure 2 This is a schematic diagram of the main body of the slide gate valve of this utility model.

[0028] Reference numerals: 1. Upper mounting base; 2. Lower mounting base; 3. Gate valve body; 31. Valve plate; 32. Valve seat; 4. Drive unit; 5. First sealing ring; 6. Second sealing ring; 7. Third sealing ring. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Example 1: Reference Figure 1 and Figure 2This utility model discloses a gate valve device for an equiaxed crystal vacuum precision casting furnace, comprising an upper mounting base 1, a lower mounting base 2, a gate valve body 3, a sealing system, and a cooling system. The lower mounting base 2 is used for a sealed connection with the inlet of the melting chamber, and the upper mounting base 1 is used for a sealed connection with the feeding chamber or temperature measuring mechanism. The gate valve body 3 is disposed between the upper mounting base 1 and the lower mounting base 2, and has a horizontally movable valve plate 31 and a valve seat 32 that cooperates with the valve plate 31 inside. The gate valve body 3 is also provided with a drive unit 4 for driving the valve plate 31 to move. The cooling system includes a first cooling channel formed inside the valve plate 31 and a second cooling channel formed in the valve body around the valve seat 32. Both the first and second cooling channels are provided with a cooling medium inlet and a cooling medium outlet. The sealing system includes a first sealing ring 5 disposed between the lower mounting base 2 and the bottom of the gate valve body 3, a second sealing ring 6 disposed between the upper mounting base 1 and the top of the gate valve body 3, and a third sealing ring 7 disposed between the upper mounting base 1 and the external chamber.

[0033] The upper mounting base 1 is a standardized flange interface, and its through hole size is matched with the lower port of the feeding chamber and the measuring port of the temperature measuring mechanism, respectively, so that the feeding chamber or the temperature measuring mechanism can be connected to the upper mounting base 1 by rotation or translation, thus achieving functional reuse.

[0034] The valve plate 31 is a water-cooled valve plate 31, which includes a base plate and a cover plate covering the base plate. The side of the base plate facing the cover plate is processed with a channel group that forms a first cooling flow channel. The channel group includes multiple interconnected annular water channels and connecting water channels. The cover plate is sealed to the base plate to close the channel group and form a closed flow channel.

[0035] The substrate has a cooling medium inlet and a cooling medium outlet on its side, which are connected to the first cooling flow channel. A water-blocking block is provided in the channel assembly. The water-blocking block guides the cooling medium flowing into the cooling medium inlet to circulate in the annular water channel and then flow to the cooling medium outlet. The annular water channel includes an inner water channel, a middle water channel, and an outer water channel. A check block is also provided on the side of the middle water channel and the outer water channel near the cooling medium inlet to optimize the flow path of the cooling medium and prevent short circuits.

[0036] In this embodiment, the drive unit 4 is a cylinder, and one end of the piston rod of the cylinder is hinged to the valve plate 31. The contact surface between the valve plate 31 and the valve seat 32 is coated with a solid lubricating coating. The valve seat 32 is made of a high-strength nickel-based high-temperature alloy, and its sealing surface is surface hardened by nitriding or spraying with a tungsten carbide-based hard coating.

[0037] The first and second cooling channels are connected by external pipelines to form a series cooling circuit, or they are connected to independent cooling sources to form a parallel cooling circuit; a flow regulating valve and a temperature sensor are installed at the inlet of the cooling medium.

[0038] The slide gate valve device adopts a modular design, with the valve plate 31, valve seat 32, and each sealing ring being modular components that can be independently disassembled and replaced. The connection surfaces between the lower mounting base 2 and the slide gate valve body 3, as well as the connection surfaces between the upper mounting base 1 and the slide gate valve body 3, are precision machined, with a flatness error of no more than 0.05 mm and a surface roughness Ra of no more than 0.8 micrometers.

[0039] In this embodiment, the lower mounting base 2 is used to fix the inlet flange connected to the melting chamber and achieves a static seal through a sealing ring. The upper mounting base 1 is located above the gate valve body 3 and is used to dock with the feeding chamber or temperature measuring mechanism, and is sealed through a third sealing ring 7. The gate valve body 3 is sandwiched between the upper and lower mounting bases 2, sealed by a first sealing ring 5 and a second sealing ring 6, and connected by bolts to form an integral module. This modular design facilitates installation and subsequent maintenance.

[0040] The slide gate valve body 3 is the core moving component of the device. Internally, it contains a horizontally movable valve plate 31 and a valve seat 32 that precisely matches the valve plate 31. The movement of the valve plate 31 is driven by a drive unit 4 (usually a cylinder) via a piston rod. Under the drive, the valve plate 31 can move between an "open" position (connecting the smelting chamber to the external compartment) and a "closed" position (isolating the smelting chamber from the external compartment).

[0041] The valve plate 31 is internally cooled and is designed as a water-cooled valve plate 31. Specifically, the valve plate 31 is assembled from a base plate and a cover plate by welding (such as continuous peripheral welding) or riveting and sealing welding. On the base plate, a complex array of channels is formed through machining (such as milling). These channels include multiple concentric annular water channels and S-shaped or spiral connecting water channels for communication. After the cover plate is sealed, these channels form the first cooling flow channel embedded inside the valve plate 31. Cooling water (or other cooling medium) flows in from the cooling medium inlet and, guided by the baffle and check block, flows sequentially through the outer, middle, and inner water channels, effectively carrying away heat before flowing out from the cooling medium outlet. This internal flow channel design allows cooling to act directly on the valve plate 31 body, which has the highest heat load, effectively suppressing its thermal deformation.

[0042] Cooling is provided around the valve seat 32. Inside the valve body, surrounding the area of ​​the valve seat 32, a separate second cooling channel is also machined. This channel also carries cooling water to cool the valve seat 32 and adjacent valve body areas, preventing sealing failure due to localized overheating. The first and second cooling channels can be designed in series or parallel as needed.

[0043] The multi-functional interface design features an upper mounting base 1 designed as a standardized flange interface. Its through-hole size and bolt hole positions are specially designed to precisely align with both the lower port of the charging chamber and the measuring port of the temperature measuring mechanism. Switching between the charging chamber and the temperature measuring mechanism on the same valve interface is achieved through a simple rotation or translation mechanism. This design significantly optimizes the overall layout of the melting chamber.

[0044] The sealing system is optimized by employing multiple sealing rings to form a redundant sealing system. In addition to the first, second, and third sealing rings 7 installed on the flange mating surface, the surface of the valve plate 31 can be coated with a high-temperature resistant solid lubricant coating (such as molybdenum disulfide or polytetrafluoroethylene composite coating) on ​​the dynamic sealing surface between the valve plate 31 and the valve seat 32. This reduces the coefficient of friction and, to some extent, aids in sealing. The sealing surface of the valve seat 32 can be made of hard alloy or undergo surface hardening treatment to enhance its wear resistance and erosion resistance.

[0045] In this embodiment, the slide gate valve device has its upper mounting base 1 and lower mounting base 2 both forged from 304 stainless steel to provide sufficient strength and corrosion resistance. The valve body of the slide gate valve body 3 is made of 316L stainless steel. The lower mounting base 2 is fixedly connected to the flange on the melting chamber wall by bolts, and a high-temperature resistant metal spiral wound gasket is installed between the mating surfaces as a sealing ring to ensure the reliability of the static seal. The lower mounting base 2 is connected to the lower flange of the slide gate valve body 3 by bolts, and a first sealing ring 5 is provided between them. This sealing ring is a fluororubber O-ring with a temperature resistance of up to 200°C.

[0046] The upper mounting base 1 is connected to the upper flange of the slide gate valve body 3 by bolts, with a second sealing ring 6 installed between them. This sealing ring is a fluororubber O-ring, which can withstand temperatures up to 200℃. The upper end face of the upper mounting base 1 is machined with a standard RF type flange face for docking with the feeding chamber or temperature measuring mechanism, and a seal is achieved through a third sealing ring 7 (also a fluororubber O-ring).

[0047] Inside the slide gate valve body 3, the valve plate 31 is driven by a cylinder (drive unit 4) through a piston rod to perform horizontal reciprocating motion. The cylinder is a double-acting type, with a built-in magnetic switch for detecting the piston position, and is equipped with an adjustable buffer pad. When the valve plate 31 is open, the melting chamber is connected to the upper compartment; when closed, the valve plate 31 is pressed against the valve seat 32 to achieve isolation.

[0048] In this embodiment, the valve plate 31 adopts a water-cooled design. The substrate material is copper (due to its excellent thermal conductivity), and three concentric annular water channels and S-shaped connecting water channels are machined on it using a CNC milling machine. The cover plate is a flat plate of the same material as the substrate, and is vacuum brazed to the substrate along the outer edge and around all fixing holes and process holes to form a sealed first cooling channel. Cooling water flows in from the cooling medium inlet on the side of the substrate, and under the guidance of the water baffle, flows sequentially through the outer, middle, and inner annular water channels, and flows out from the cooling medium outlet after sufficient heat exchange. An annular second cooling channel is machined in the valve body around the valve seat 32. This embodiment adopts series cooling, that is, the cooling water first flows into the second cooling channel to pre-cool the valve seat 32 area, and then is introduced into the first cooling channel of the valve plate 31 through an external hose for deep cooling, and finally discharged in a concentrated manner. The cooling water flow rate is set to 3-5 L / min, supplied by an external pump station, and a flow meter and temperature sensor are installed on the inlet pipe for monitoring.

[0049] Workflow: When material needs to be added, rotate the feeding chamber above the slide gate valve and lower it to align with the upper mounting base 1. After evacuating the feeding chamber to achieve pressure equilibrium with the melting chamber, the cylinder actuates, pulling the valve plate 31 to the open position for material addition. After material addition is complete, the valve plate 31 closes and the feeding chamber moves away. The temperature measurement process is similar. Throughout the entire process, the cooling system runs continuously to ensure that the temperature of the valve plate 31 remains below 150℃, effectively preventing thermal deformation.

[0050] The implementation principle of this utility model is as follows: This utility model discloses a slide gate valve device for an equiaxed crystal vacuum precision casting furnace, belonging to the technical field of vacuum melting equipment. This device aims to solve the problems of poor sealing reliability, large operating torque, easy jamming, and inconvenient maintenance of existing slide gate valves under high temperature, high pressure, and vacuum environments. The core innovation lies in the integration of a high-efficiency water cooling system, a multi-functional reusable interface, and an optimized sealing and driving structure. The device mainly includes an upper mounting base 1, a lower mounting base 2, a slide gate valve body 3, a sealing system, and a cooling system. The slide gate valve body 3 drives the valve plate 31 to move horizontally via a cylinder, achieving isolation and communication between the melting chamber and the feeding chamber or temperature measuring mechanism. Cooling water channels are integrated inside the valve plate 31 and around the valve seat 32, effectively suppressing high-temperature thermal deformation. The upper mounting base 1 serves as a standard interface, allowing for switching between the feeding chamber and the temperature measuring mechanism, achieving functional reuse and simplifying the furnace structure. This invention has the advantages of excellent sealing performance, easy operation, resistance to heat jamming, and convenient maintenance, which significantly improves the continuous operation efficiency and reliability of equiaxed crystal vacuum precision casting furnace.

[0051] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A gate valve device for an equiaxed crystal vacuum precision casting furnace, characterized in that, It includes an upper mounting base (1), a lower mounting base (2), a gate valve body (3), a sealing system, and a cooling system. The lower mounting base (2) is used for a sealed connection with the inlet of the melting chamber, and the upper mounting base (1) is used for a sealed docking with the feeding chamber or temperature measuring mechanism. The slide gate valve body (3) is disposed between the upper mounting base (1) and the lower mounting base (2). Inside it is a horizontally movable valve plate (31) and a valve seat (32) that cooperates with the valve plate (31). The slide gate valve body (3) is also provided with a drive unit (4) for driving the valve plate (31) to move. The cooling system includes a first cooling channel formed inside the valve plate (31) and a second cooling channel formed in the valve body around the valve seat (32). Both the first and second cooling channels are provided with a cooling medium inlet and a cooling medium outlet. The sealing system includes a first sealing ring (5) disposed between the bottom of the lower mounting base (2) and the bottom of the gate valve body (3), a second sealing ring (6) disposed between the top of the upper mounting base (1) and the top of the gate valve body (3), and a third sealing ring (7) disposed between the upper mounting base (1) and the outer compartment.

2. The gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 1, characterized in that, The upper mounting base (1) is a standardized flange interface, and its through hole size is matched with the lower port of the feeding chamber and the measuring port of the temperature measuring mechanism, so that the feeding chamber or the temperature measuring mechanism can be connected to the upper mounting base (1) by rotation or translation switching, so as to realize functional reuse.

3. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 1, characterized in that, The valve plate (31) is a water-cooled valve plate (31), which includes a base plate and a cover plate covering the base plate. The side of the base plate facing the cover plate is processed with a channel group that constitutes the first cooling channel. The channel group includes multiple interconnected annular water channels and connecting water channels. The cover plate is sealed to the base plate to close the channel group and form a closed channel.

4. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 3, characterized in that, The substrate has a cooling medium inlet and a cooling medium outlet on its side, which are connected to the first cooling channel; a water baffle is provided in the channel group, which guides the cooling medium flowing into the cooling medium inlet to circulate in the annular water channel and then flow to the cooling medium outlet.

5. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 4, characterized in that, The annular water channel includes an inner water channel, a middle water channel, and an outer water channel. The middle water channel and the outer water channel are also provided with a check block on the side near the cooling medium inlet to optimize the flow path of the cooling medium and prevent short circuits.

6. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 1, characterized in that, The drive unit (4) is a cylinder, and one end of the piston rod of the cylinder is hinged to the valve plate (31). The contact surface between the valve plate (31) and the valve seat (32) is coated with a solid lubricating coating.

7. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 1, characterized in that, The valve seat (32) is made of high-strength nickel-based high-temperature alloy, and its sealing surface is subjected to surface hardening treatment, which is nitriding or spraying tungsten carbide-based hard coating.

8. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 1, characterized in that, The first cooling channel and the second cooling channel are connected by external pipelines to form a series cooling circuit, or they are connected to independent cooling sources to form a parallel cooling circuit; a flow regulating valve and a temperature sensor are provided at the inlet of the cooling medium.

9. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to claim 1, characterized in that, The slide gate valve device adopts a modular design as a whole. The valve plate (31), valve seat (32) and each sealing ring are modular components that can be independently disassembled and replaced.

10. A gate valve device for an equiaxed crystal vacuum precision casting furnace according to any one of claims 1 to 9, characterized in that, The connection surfaces of the lower mounting base (2) and the slide valve body (3), as well as the connection surfaces of the upper mounting base (1) and the slide valve body (3), are all precision machined, with a flatness error of no more than 0.05 mm and a surface roughness Ra of no more than 0.8 micrometers.

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