CN114001168A - Large-drift-diameter combined type plugboard valve group of continuous vacuum furnace - Google Patents

Abstract

The invention belongs to the technical field of vacuum furnaces, and particularly relates to a large-drift-diameter combined type flashboard valve bank of a continuous vacuum furnace. The large-diameter combined type plug board valve group can be used for large-diameter sealing and opening under severe working conditions of high temperature, splashing of metal liquid, volatile matter and the like. Comprises a plate valve group; the flashboard valve group comprises an upper flashboard valve and a lower flashboard valve; the upper part of the gate valve is arranged in a smelting chamber of the smelting chamber, and the lower part of the gate valve is arranged in an ingot casting chamber; the melting chamber and the ingot casting chamber are sealed independently, so that the melting chamber and the ingot casting chamber can be connected and separated under the condition of maintaining vacuum.

Description

Large-drift-diameter combined type plugboard valve group of continuous vacuum furnace

Technical Field

The invention belongs to the technical field of vacuum furnaces, and particularly relates to a large-drift-diameter combined type flashboard valve bank of a continuous vacuum furnace.

Background

Vacuum arc furnaces, vacuum electron beam furnaces and vacuum ion beam furnaces sometimes need to melt large-tonnage titanium ingots or other metal ingots, which may weigh tens of tons. In order to realize continuous smelting of a vacuum arc furnace, a vacuum electron beam furnace and a vacuum ion beam furnace under the condition of not damaging vacuum, a pair of gate valves is required to be added between a smelting chamber and an ingot casting chamber for sealing an upper chamber and a lower chamber so as to ensure that the two chambers have relatively independent vacuum environments.

Meanwhile, the large-tonnage vacuum arc furnace, the vacuum electron beam furnace and the vacuum ion beam furnace have large caliber at the connection part of the smelting chamber and the ingot casting chamber, and a large-caliber flashboard valve bank is needed. The traditional gate valve only using a group of cylinders as driving elements cannot meet the requirement of large caliber and can still normally work under the conditions of high temperature and severe working conditions. It is necessary to develop a new type of plate inserting valve set to seal the smelting chamber and the ingot casting chamber separately.

Disclosure of Invention

The invention provides a large-diameter combined type flashboard valve bank of a continuous vacuum furnace aiming at the defects in the prior art. The large-diameter combined type plug board valve group can be used for large-diameter sealing and opening under severe working conditions of high temperature, splashing of metal liquid, volatile matter and the like.

In order to achieve the purpose, the invention adopts the following technical scheme that the large-drift-diameter combined type plug board valve group of the continuous vacuum furnace comprises a plug board valve group; the valve group comprises an upper gate valve and a lower gate valve; the upper part of the gate valve is arranged in a smelting chamber of the smelting chamber, and the lower part of the gate valve is arranged in an ingot casting chamber; the melting chamber and the ingot casting chamber are sealed independently, so that the melting chamber and the ingot casting chamber can be connected and separated under the condition of maintaining vacuum.

And furthermore, the ingot casting chamber is lifted through a lifter and is used for connecting or separating a flange interface of a gate valve of the smelting chamber with a flange interface of a gate valve of the ingot casting chamber.

Furthermore, an auxiliary evacuating and breaking mechanism is arranged on a valve body of the gate valve of the smelting chamber.

Further, the gate valve of the smelting chamber and the gate valve of the ingot casting chamber respectively comprise a valve body, a valve plate translation unit, a pressing unit and a protective cover; the gate valve of the ingot casting chamber also comprises a roller elastic mechanism.

Furthermore, the valve plate translation unit is divided into an ingot chamber gate valve plate translation unit and a smelting chamber gate valve plate translation unit; the ingot casting chamber gate valve plate translation unit comprises an ingot casting chamber gate valve plate, an ingot casting chamber gate valve translation oil cylinder, an ingot casting chamber gate valve translation connecting slide block and an ingot casting chamber gate valve translation connecting seat; the translational motion of the valve plate in the valve body is realized through the extension and retraction of the cylinder rod of the oil cylinder, and the opening structure at the upper end of the translational connecting slide block ensures the degree of freedom of the valve plate in the vertical direction, so that the valve plate can be translated and can realize the actions of pressing and opening the valve; the structure is cancelled in the structure of the valve plate translation unit of the gate valve of the smelting chamber, the roller guide frame guide posts are used for replacing the translation connecting sliding blocks, the valve plate (support) penetrates through the roller guide frame guide posts, the degree of freedom in the vertical direction of the valve plate is guaranteed, the valve plate can translate, and the compressing and valve opening actions can be realized.

Furthermore, the pressing unit comprises a pressing oil cylinder, a cylinder rod, a dynamic seal, a valve plate bracket and a protective cover bracket; the cylinder rod and the protective cover bracket are fixed through a thin nut, so that the protective cover and the cylinder rod act together; the compression of the valve plate is controlled by the extension of the cylinder rod against the valve plate holder.

Furthermore, the roller elastic mechanism consists of a shell, a wheel carrier, a limit screw and a spring; the gate valve of the ingot casting chamber has four groups of roller elastic mechanisms which are respectively fixed with the valve plate (bracket) through bolts; when the valve plate is pressed, the spring is compressed, and pressing force is converted into elastic potential energy; when the valve plate is opened, the elastic potential energy is converted into gravitational potential energy to lift the valve plate, so that the valve opening action is realized; the limit screw ensures that the wheel carrier can move safely in the housing.

The operation method based on the continuous vacuum furnace large-drift-diameter combined type inserting plate valve group comprises the following steps of: step one, a gate valve of the smelting chamber is in butt joint with a gate valve of the ingot casting chamber, and cavities of the smelting chamber and the ingot casting chamber are evacuated at the moment.

And step two, withdrawing the gate valve of the smelting chamber and the gate valve of the ingot casting chamber to the interior of the valve body, and carrying out smelting and casting operation (assembly equipment).

And step three, sealing the valve group, and separating the gate valve of the ingot casting chamber from the gate valve of the smelting chamber when the internal and external pressures of the cavity are equal.

Further, the first step comprises the following sub-steps: step 1.1, moving an ingot casting chamber to a position right below a smelting chamber to enable valve ports of an upper gate valve and a lower gate valve to be concentric; at the moment, the valve plates of the upper gate valve and the lower gate valve are in a closed state, and the smelting chamber and the ingot casting chamber are also in a vacuum state.

And step 1.2, the elevator starts to jack up the ingot casting chamber, so that an upper valve port of a gate valve of the ingot casting chamber is in butt joint with a lower valve port of a gate valve of the smelting chamber.

And 1.3, evacuating the atmosphere remained in the valve group cavity by using auxiliary evacuation equipment of a gate valve of the smelting chamber to ensure that the vacuum degree in the cavity is basically equal to that of the ingot casting chamber and the smelting chamber.

Further, the second step comprises the following sub-steps:

and 2.1, retracting a cylinder rod of a pressing unit of the ingot casting chamber flashboard and a pressing unit of the smelting chamber flashboard, upwards bouncing a valve plate of the ingot casting chamber flashboard under the action of a roller elastic mechanism spring, and enabling the valve plate of the smelting chamber flashboard to fall down along the roller guide frame guide mechanism in the vertical direction under the action of gravity.

And 2.2, retracting cylinder rods of the translation mechanisms of the gate valve of the smelting chamber and the gate valve of the ingot casting chamber to drive the valve plate to be recovered into the corresponding valve body.

And 2.3, extending the cylinder rods of the two valve plate pressing mechanisms again to drive the two corresponding protective covers to move towards the valve port, so that the protective covers completely cover the valve port sealing rubber ring, and simultaneously, the protective covers realize the isolation of the valve port from the interior of the cavity.

And 2.4, connecting a translation connecting seat of the gate valve plate of the ingot casting chamber with a translation connecting slide block through a bolt, and enabling the valve plate to have a certain degree of freedom when moving in the vertical direction through an opening in the upper end of the translation connecting slide block.

And 2.5, connecting the valve plate of the gate valve of the smelting chamber with a roller guide frame of the gate valve of the smelting chamber through guide posts on the guide frame, so that the valve plate has certain freedom degree when moving in the vertical direction.

And 2.6, carrying out smelting operation.

Further, the third step comprises the following sub-steps: and 3.1, after the smelting is finished, retracting cylinder rods of the two pressing mechanisms, moving the protective cover in the gate valve of the ingot casting chamber upwards, and dropping the protective cover of the gate valve of the smelting chamber.

3.2, extending cylinder rods of the two translation mechanisms to push the corresponding valve plates to be concentric with the valve ports; the cylinder rods of the two pressing mechanisms extend out to tightly push the two valve plates, and the rubber rings are pressed tightly to seal; the smelting chamber and the ingot casting chamber become relatively independent vacuum cavities again.

3.3, opening a vacuum breaking mechanism of a gate valve of the smelting chamber to enable the atmospheric pressures inside and outside the valve group cavity to be equal; then the elevator drives the ingot casting chamber to descend, and the gate valve of the ingot casting chamber is separated from the gate valve of the smelting chamber.

Step 3.4, the whole ingot casting chamber is translated to other stations, and the metal ingot in the ingot casting chamber is continuously cooled; and simultaneously moving into a new ingot chamber component to carry out smelting in a new furnace.

And further, continuously cooling the valve plate of the gate valve body of the ingot casting chamber by water, and leading out cooling water from the top end of the valve plate by a cooling water tank after the cooling water is filled in the middle water layer of the valve plate of the gate valve of the ingot casting chamber.

Compared with the prior art, the invention has the beneficial effects.

The plate inserting valve is divided into an upper part and a lower part which are respectively and independently connected with the smelting chamber and the ingot casting chamber, so that the smelting chamber and the ingot casting chamber are independently sealed, and the smelting chamber and the ingot casting chamber can be connected and separated under the condition of maintaining a vacuum state.

Drawings

The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.

Fig. 1 is a schematic diagram of a large-diameter combined type flashboard valve block special for a continuous type remelting furnace in the final assembly.

Fig. 2 is a schematic diagram of a gate valve of a large-diameter combined gate valve set ingot casting chamber special for a continuous remelting furnace.

Fig. 3 is a schematic view of a gate valve of a large-diameter combined gate valve set smelting chamber special for a continuous heavy smelting furnace.

FIG. 4 is a schematic view of the butt joint of the upper and lower gate valves and the evacuation of the cavity in the middle gate valve set in the first step.

FIG. 5 is a schematic view of the top and bottom valve plates withdrawing from the valve body in the second step, and the final assembly equipment performs smelting and casting operations.

Fig. 6 is a schematic diagram of the sealing operation of the valve group in the third step, and when the internal and external pressures of the cavity are equal, the gate valve of the ingot casting chamber is separated from the gate valve of the smelting chamber.

FIG. 7 is a schematic view of a gate valve translation unit of the ingot chamber.

FIG. 8 is a schematic view of a gate valve roller elastic mechanism of the ingot chamber.

Fig. 9 is a schematic view of the arrangement of water paths inside the protective cover.

Fig. 10 is a schematic diagram of a gate valve pressing unit of an ingot chamber (the structure of the gate valve pressing unit of the melting chamber is the same, and the stroke is different).

In the drawing, a gate valve body 1 of a gate valve of a casting ingot chamber, a gate valve plate 2 of the gate valve of the casting ingot chamber, a gate valve protective cover 3 of the gate valve of the casting ingot chamber, a gate valve translation unit 4 of the gate valve of the casting ingot chamber, a gate valve pressing unit 5 of the casting ingot chamber, a roller elastic mechanism 6 of the gate valve of the casting ingot chamber, a gate valve translation oil cylinder 7 of the casting ingot chamber, a gate valve translation connecting slide block 8 of the casting ingot chamber, a gate valve translation connecting seat 9 of the casting ingot chamber and a gate valve cooling water tank 10 of the gate valve of the casting ingot chamber; the device comprises a smelting chamber gate valve body 11, a smelting chamber gate valve plate 12, a smelting chamber gate valve protective cover 13, a smelting chamber gate valve plate translation unit 14, a smelting chamber gate valve pressing unit 15, a smelting chamber gate valve roller guide frame 16, a smelting chamber gate valve emptying mechanism 17 and a roller guide frame guide post 18; the device comprises a lifter 31, an ingot casting chamber 32, a smelting chamber 33, an ingot casting chamber gate valve 34 and a smelting chamber gate valve 35.

Detailed Description

As shown in FIGS. 1-10, the present invention is suitable for the working conditions that the lowest negative pressure can reach 5X 10-2 to 1X 10-3Mpa and the highest use temperature can reach 1000 ℃. Meanwhile, the device can deal with various severe working conditions such as high temperature, splashing of molten metal and the like during metal smelting. Can meet the sealing requirement of a large-caliber vacuum chamber with the maximum caliber up to 1700 mm. The plate inserting valve group is divided into an upper part and a lower part which are respectively and independently connected with the smelting chamber and the ingot casting chamber to realize independent sealing of the smelting chamber and the ingot casting chamber, so that the smelting chamber and the ingot casting chamber can be connected and separated under the condition of maintaining vacuum. One or more groups of gate valve assemblies of the ingot casting chamber and the smelting chamber can be selected according to specific conditions. The large-diameter combined type plate inserting valve group special for the continuous remelting furnace can ensure that continuous smelting operation can be carried out under the condition that the smelting chamber is not broken empty, and simultaneously can ensure that liquid metal ingots in the ingot casting chamber can be cooled in a vacuum environment all the time.

The combined flashboard valve group is applied to a continuous type vacuum electron beam furnace, a continuous type vacuum arc furnace, a continuous type vacuum ion beam furnace and other large flashboard valves used for independently sealing an upper vacuum chamber and a lower vacuum chamber.

The upper gate valve and the lower gate valve are composed of two groups of transmission units, namely a pressing unit and a valve plate translation unit. The transmission modes of the two units adopt hydraulic transmission. The hydraulic transmission is stable, the load is large, the work is stable, the hydraulic transmission can adapt to severe environment, and the hydraulic transmission is suitable for the working condition. Wherein, the gate valve of the ingot casting chamber and the gate valve of the ingot casting chamber are respectively connected with the smelting chamber by bolts. And then the elevator controls the ingot casting chamber to lift, so that the two gate valve flange interfaces are connected or separated, and the whole gate valve group is suitable for different working conditions. The auxiliary evacuation and vacuum breaking mechanism is additionally arranged on the smelting chamber plug board valve body, and the air in the valve bank can be evacuated and vacuum broken in the closed state of the valve plate of the valve bank.

The combination of the gate valve of the ingot casting chamber and the ingot casting chamber can select one or more groups of ingot casting chambers, and when the multiple groups of ingot casting chambers are combined, the ingot casting chamber can be combined to carry out ingot pulling, and simultaneously, the ingot cooling is carried out on the other group of ingot casting chamber. Or the ingot casting chamber combination in a closed state can be subjected to early evacuation treatment, so that the time of the whole process can be greatly saved.

The lifting action when the gate valve plate of the ingot casting chamber is opened is completed through the roller elastic mechanism. The spring in the roller elastic mechanism releases elastic potential energy, so that the valve plate is jacked up. The valve plate is pressed downwards and is pushed by a cylinder rod of a hydraulic cylinder of the valve plate pressing unit. The descending action of the flashboard valve plate of the smelting chamber during working is realized through the gravity of the valve plate, and the roller guide frame unique to the flashboard valve of the smelting chamber plays a role in guiding the valve plate in the vertical direction at the moment. In addition, the roller guide frame can also carry the valve plate to move horizontally together. The valve plate of the flashboard of the smelting chamber is pressed upwards and is pushed by a cylinder rod of a hydraulic cylinder of the valve plate pressing unit.

Because the gate valve of the ingot casting chamber needs to bear the heat radiation of high-temperature liquid metal in a long-time melting state, the gate valve plate of the ingot casting chamber needs to be cooled by water. The valve plate of the ingot casting chamber is of a double-layer structure, a water tank is arranged between two layers of steel plates, and cooling water naturally overflows upwards in the interlayer of the valve plate and is then led out from the water tank of the upper layer of the valve plate. The valve plate is cooled by water, so that the thermal deformation of the insert plate valve plate of the ingot casting chamber in a high-temperature environment can be prevented, and the failure of the sealing performance of the rubber ring caused by the contact of the rubber ring after the valve plate is heated can be prevented. For the gate valve of the smelting chamber, the smelting chamber does not need smelting operation under the condition of sealing the valve plate, only the vacuum state of smelting needs to be kept, and the valve plate is not in a high-temperature environment, so that the water cooling of the gate valve plate of the smelting chamber is not needed. The protection casing of ingot casting room push-pull valve and smelting room push-pull valve can be in the smelting in-process whereabouts, and the pollution of the metal solution of isolated splashing to sealing rubber ring and valve body inside prevents the influence of the thermal radiation in the smelting process to the valve body simultaneously. Therefore, the protective cover is of a double-layer structure, the inner layer of the protective cover is used for water inlet, the outer layer of the protective cover is used for water return, and the middle of the protective cover is provided with a cooling water channel formed by multi-layer discontinuous round steel, so that the inner wall of the protective cover is uniformly and fully cooled by water.

Ingot casting room push-pull valve plate translation unit 4: the structure comprises a gate valve plate 2 of a casting ingot chamber, a gate valve translation oil cylinder 7 of the casting ingot chamber, a gate valve translation connecting slide block 8 of the casting ingot chamber and a gate valve translation connecting seat 9 of the casting ingot chamber. The translational motion of the valve plate in the valve body is realized through the extension and contraction of the cylinder rod of the oil cylinder, the degree of freedom of the valve plate in the vertical direction is ensured by the opening structure at the upper end of the translational connecting slide block 8, and the valve plate can be translated and can be compressed and opened.

The structure of the valve plate translation unit 14 of the gate valve of the smelting chamber is similar to that of the gate valve, only the translation connecting slide block 8 structure is cancelled, and the roller guide frame guide posts 18 are used for replacing (see fig. 3), so that the valve plate (support) penetrates through the roller guide frame guide posts 18, the degree of freedom in the vertical direction of the valve plate is ensured, the valve plate can translate, and the compressing and valve opening actions can be realized.

Pressing units 5, 15: the structure comprises a compression oil cylinder 19, a cylinder rod 21, a dynamic seal 20, a valve plate support 23 and a protective cover support 22. The cylinder rod 21 and the shield bracket 22 are fixed by a thin nut, so that the shield and the cylinder rod operate together. The compression of the valve plate is controlled by the extension of the cylinder rod against the valve plate (bracket).

Ingot casting chamber push-pull valve gyro wheel elastic mechanism 6: the structure consists of a shell 27, a wheel frame 30, a limit screw 29 and a spring 28; the gate valve of the ingot casting chamber has 4 groups of roller elastic mechanisms 6 which are respectively fixed with the valve plate (bracket) through bolts. When the valve plate is compressed, the spring 28 is compressed, and the compression force is converted into elastic potential energy; when the valve plate opens the valve, the elastic potential energy is converted into gravitational potential energy to lift the valve plate, so that the valve opening action is realized. The limit screw ensures that the wheel carrier can move safely in the housing.

As shown in fig. 9, the protective cover is provided with a water return port 24 and a water inlet port 25; also visible are round bar breaks 26. The operation steps are as follows: step one, butting an upper gate valve and a lower gate valve of a gate valve group and evacuating a cavity: 1) and moving the ingot casting chamber to the position right below the smelting chamber to ensure that the valve ports of the upper gate valve and the lower gate valve are concentric. At the moment, the valve plates of the upper gate valve and the lower gate valve are in a closed state, and the smelting chamber and the ingot casting chamber are also in a vacuum state. (in order to save the running time of the equipment, the ingot casting chamber is evacuated in advance before the ingot casting chamber is connected with the smelting chamber because the volume of the ingot casting chamber is large).

2) The elevator starts to jack up the ingot casting chamber, so that an upper valve port valve of a gate valve of the ingot casting chamber is in butt joint with a lower valve port of a gate valve of the smelting chamber.

3) And the auxiliary evacuation equipment of the gate valve of the smelting chamber is used for evacuating the atmosphere remained in the valve group cavity, so that the vacuum degree in the cavity is basically equal to that of the ingot casting chamber and the smelting chamber.

Step two, the upper valve plate and the lower valve plate withdraw the interior of the valve body, and the assembly equipment carries out smelting and casting operation: 1) the pressing unit 5 of the ingot chamber flashboard and the pressing unit 15 of the smelting chamber flashboard retract, the valve plate 2 of the ingot chamber flashboard springs upwards under the action of the spring of the roller elastic mechanism 6, and the valve plate 12 of the smelting chamber flashboard falls down along the roller guide frame guide mechanism 16 in the vertical direction under the action of gravity.

2) The translation mechanisms 4 and 14 of the two valves in the valve group retract to drive the valve plates 2 and 12 to be recovered into the valve bodies 1 and 11.

3) The cylinder rods of the valve plate pressing mechanisms 5 and 15 extend out again to drive the protective covers 3 and 13 to move towards the valve ports, so that the protective covers 3 and 13 completely cover the valve port sealing rubber rings, and meanwhile, the protective covers 3 and 13 realize the isolation of the valve ports from the interior of the cavity.

4) The translation connecting seat 9 of the gate valve plate 2 of the ingot casting chamber is in bolt connection with the translation connecting slide block 8, and the opening at the upper end of the translation connecting slide block 8 enables the valve plate to have a certain degree of freedom when moving in the vertical direction.

5) The valve plate 2 of the gate valve of the smelting chamber is connected with a roller guide frame 16 of the gate valve of the smelting chamber through a guide post 18 on the guide frame, so that the valve plate has certain degree of freedom when moving in the vertical direction.

6) At this point, the smelting operation can proceed.

Step three, sealing the valve group, and separating the gate valve of the ingot casting chamber from the gate valve of the smelting chamber when the internal and external pressures of the cavity are equal: 1) after the smelting is finished, the cylinder rods of the pressing mechanisms 5 and 15 retract, the inner protective cover 3 of the gate valve of the ingot casting chamber moves upwards, and the protective cover 13 of the gate valve of the smelting chamber falls.

2) The translation mechanism 4, 14 extends the cylinder rod to push the valve plate 2, 12 to a position concentric with the valve port. The cylinder rods of the pressing mechanisms 5 and 15 extend out to tightly push the valve plates 2 and 12 to press the rubber rings for sealing. The smelting chamber and the ingot casting chamber become relatively independent vacuum cavities again.

3) And opening a vacuum breaking mechanism 17 of the gate valve of the smelting chamber to ensure that the atmospheric pressure inside and outside the valve group cavity is equal. Then the elevator drives the ingot casting chamber to descend, and the gate valve of the ingot casting chamber is separated from the gate valve of the smelting chamber.

4) The whole ingot casting chamber is translated to other stations, and the metal ingot in the ingot casting chamber is continuously cooled. And simultaneously moving into a new ingot chamber component to carry out smelting in a new furnace.

In the process, the valve plate of the plug board valve body of the ingot casting chamber needs to be continuously cooled by water, so that the valve plate is prevented from being heated and conducting heat to the rubber ring by liquid metal heat radiation, and the sealing performance of the rubber ring after being heated is enabled to be invalid. The cooling water can be led out from the top end of the valve plate by a cooling water tank 10 after the middle water layer of the gate valve plate 2 of the ingot casting chamber is filled.

The large-drift-diameter combined type inserting plate valve bank special for the continuous remelting furnace is required to be operated to set interlocking of all actions, the valve bank is operated to realize complete automation, and damage to personnel or equipment caused by misoperation of workers is avoided.

It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims (10)

1. The large-drift-diameter combined type plug board valve group of the continuous vacuum furnace comprises a plug board valve group; the method is characterized in that: the flashboard valve group comprises an upper flashboard valve and a lower flashboard valve; the upper part of the gate valve is arranged in a smelting chamber of the smelting chamber, and the lower part of the gate valve is arranged in an ingot casting chamber; the melting chamber and the ingot casting chamber are sealed independently, so that the melting chamber and the ingot casting chamber can be connected and separated under the condition of maintaining vacuum.

2. A large-diameter combined type flashboard valve group for a continuous vacuum furnace according to claim 1, which is characterized in that: the ingot casting chamber is lifted through the lifter and is used for connecting or separating a flange interface of a gate valve of the smelting chamber and a flange interface of a gate valve of the ingot casting chamber.

3. A large-diameter combined type flashboard valve group for a continuous vacuum furnace according to claim 1, which is characterized in that: an auxiliary evacuation and vacuum breaking mechanism is arranged on a valve body of the gate valve of the smelting chamber.

4. A large-diameter combined type flashboard valve group for a continuous vacuum furnace according to claim 1, which is characterized in that: the smelting chamber gate valve and the ingot casting chamber gate valve respectively comprise a valve body, a valve plate translation unit, a pressing unit and a protective cover; the gate valve of the ingot casting chamber also comprises a roller elastic mechanism.

5. A continuous type vacuum furnace large-drift-diameter combined type flashboard valve group according to claim 4, which is characterized in that: the valve plate translation unit is divided into an ingot chamber gate valve plate translation unit and a smelting chamber gate valve plate translation unit;

the ingot casting chamber gate valve plate translation unit comprises an ingot casting chamber gate valve plate, an ingot casting chamber gate valve translation oil cylinder, an ingot casting chamber gate valve translation connecting slide block and an ingot casting chamber gate valve translation connecting seat; the translational motion of the valve plate in the valve body is realized through the extension and retraction of the cylinder rod of the oil cylinder, and the opening structure at the upper end of the translational connecting slide block ensures the degree of freedom of the valve plate in the vertical direction, so that the valve plate can be translated and can realize the actions of pressing and opening the valve;

the structure is cancelled in the structure of the valve plate translation unit of the gate valve of the smelting chamber, the roller guide frame guide posts replace translation connection sliding blocks, the valve plate support penetrates through the roller guide frame guide posts, the degree of freedom in the vertical direction of the valve plate is guaranteed, the valve plate can translate, and the compressing and valve opening actions can be realized.

6. A continuous type vacuum furnace large-drift-diameter combined type flashboard valve group according to claim 4, which is characterized in that: the pressing unit comprises a pressing oil cylinder, a cylinder rod, a dynamic seal, a valve plate support and a protective cover support; the cylinder rod and the protective cover bracket are fixed through a thin nut, so that the protective cover and the cylinder rod act together; the compression of the valve plate is controlled by the extension of the cylinder rod against the valve plate holder.

7. A continuous type vacuum furnace large-drift-diameter combined type flashboard valve group according to claim 4, which is characterized in that: the roller elastic mechanism consists of a shell, a wheel frame, a limit screw and a spring; the gate valve of the ingot casting chamber has four groups of roller elastic mechanisms which are respectively fixed with the valve plate bracket through bolts; when the valve plate is pressed, the spring is compressed, and pressing force is converted into elastic potential energy; when the valve plate is opened, the elastic potential energy is converted into gravitational potential energy to lift the valve plate, so that the valve opening action is realized; the limit screw ensures that the wheel carrier can move safely in the housing.

8. A large-diameter combined type flashboard valve group for a continuous vacuum furnace according to claim 1, which is characterized in that: the operation method based on the continuous vacuum furnace large-drift-diameter combined type inserting plate valve group comprises the following steps of:

step one, butt joint of a gate valve of a smelting chamber and a gate valve of an ingot casting chamber, and evacuating the cavities of the smelting chamber and the ingot casting chamber;

step two, withdrawing the gate valve of the smelting chamber and the gate valve of the ingot casting chamber to the interior of the valve body, and carrying out smelting and casting operation (assembly equipment):

and step three, sealing the valve group, and separating the gate valve of the ingot casting chamber from the gate valve of the smelting chamber when the internal and external pressures of the cavity are equal.

9. A large-diameter combined type flashboard valve group for a continuous vacuum furnace according to claim 8, wherein: the first step comprises the following sub-steps:

step 1.1, moving an ingot casting chamber to a position right below a smelting chamber to enable valve ports of an upper gate valve and a lower gate valve to be concentric; at the moment, the valve plates of the upper gate valve and the lower gate valve are in a closed state, and the smelting chamber and the ingot casting chamber are also in a vacuum state;

step 1.2, the elevator starts to jack up the ingot casting chamber, so that an upper valve port of a gate valve of the ingot casting chamber is in butt joint with a lower valve port of a gate valve of the smelting chamber;

and 1.3, evacuating the atmosphere remained in the valve group cavity by using auxiliary evacuation equipment of a gate valve of the smelting chamber to ensure that the vacuum degree in the cavity is basically equal to that of the ingot casting chamber and the smelting chamber.

10. A large-diameter combined type flashboard valve group for a continuous vacuum furnace according to claim 9, wherein: the second step comprises the following sub-steps:

step 2.1, retracting a cylinder rod of a pressing unit of the ingot casting chamber flashboard and a pressing unit of the smelting chamber flashboard, upwards bouncing a valve plate of the ingot casting chamber flashboard under the action of a roller elastic mechanism spring, and enabling the valve plate of the smelting chamber flashboard to fall down along a roller guide frame guide mechanism in the vertical direction under the action of gravity;

2.2, retracting cylinder rods of translation mechanisms of the gate valve of the smelting chamber and the gate valve of the ingot casting chamber to drive the valve plate to be recycled into the corresponding valve body;

2.3, extending the cylinder rods of the two valve plate pressing mechanisms again to drive the two corresponding protective covers to move towards the valve port, so that the protective covers completely cover the valve port sealing rubber ring, and simultaneously, the protective covers realize the isolation of the valve port from the interior of the cavity;

step 2.4, connecting a translation connecting seat of the gate valve plate of the ingot casting chamber with a translation connecting slide block through a bolt, wherein an opening at the upper end of the translation connecting slide block enables the valve plate to have a certain degree of freedom when moving in the vertical direction;

2.5, connecting the valve plate of the gate valve of the smelting chamber with a roller guide frame of the gate valve of the smelting chamber through guide posts on the guide frame, so that the valve plate has a certain degree of freedom when moving in the vertical direction;

step 2.6, carrying out smelting operation;

the third step comprises the following sub-steps:

step 3.1, after the smelting is finished, retracting cylinder rods of the two pressing mechanisms, moving the protective cover in the gate valve of the ingot casting chamber upwards, and allowing the protective cover of the gate valve of the smelting chamber to fall;

3.2, extending cylinder rods of the two translation mechanisms to push the corresponding valve plates to be concentric with the valve ports; the cylinder rods of the two pressing mechanisms extend out to tightly push the two valve plates, and the rubber rings are pressed tightly to seal; the smelting chamber and the ingot casting chamber become relatively independent vacuum cavities again;

3.3, opening a vacuum breaking mechanism of a gate valve of the smelting chamber to enable the atmospheric pressures inside and outside the valve group cavity to be equal; then the elevator drives the ingot casting chamber to descend, and the gate valve of the ingot casting chamber is separated from the gate valve of the smelting chamber;

step 3.4, the whole ingot casting chamber is translated to other stations, and the metal ingot in the ingot casting chamber is continuously cooled; and simultaneously moving into a new ingot chamber component to carry out smelting in a new furnace.

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