Middle-large vacuum isolating valve

Abstract

The invention belongs to the technical field of vacuum equipment, and particularly relates to a medium-large vacuum isolating valve suitable for a vacuum metallurgy environment. A traditional vacuum isolation valve has the problems that the size is small, a valve plate is pressed only through an air cylinder, and a dustproof device is lacked. The medium-large vacuum isolating valve particularly comprises a front valve body and a rear valve body, a water-cooling valve plate is arranged in a valve port of the front valve body, a valve plate pneumatic driving device for controlling the water-cooling valve plate to ascend, descend and rotate is arranged on the front valve body, a gear ring for pressing the water-cooling valve plate is arranged in the valve port, and the rear valve body is arranged on the rear valve body. A gear ring rotating pneumatic device for controlling the gear ring to rotate is arranged on the front valve body; the front valve body is provided with a pneumatic assembly for controlling all the air cylinders to work. The five actions of lifting and rotating of the water cooling valve plate, rotating of the gear ring, lifting of the corrugated pipe and lifting of the protection cylinder can be controlled, and the better effects of sealing locking, continuous feeding, dust prevention and the like are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum equipment, and in particular relates to a medium-to-large vacuum isolation valve suitable for use in a vacuum metallurgical environment. Background Art

[0002] When using a vacuum induction furnace, especially a large vacuum induction melting furnace, opening and closing the isolation valve accurately, reliably and effectively according to the process requirements is one of the most important core operations. For large continuous vacuum induction melting furnaces, in order to meet the on-site melting process requirements and realize the continuous feeding and temperature measurement of metal raw materials, the equipment will be equipped with a large vacuum isolation valve directly above the induction crucible. The vacuum isolation valve, vacuum pump, vacuum pipeline, instrumentation and other equipment together form a complex vacuum system.

[0003] The existing vacuum isolation valve has the following problems: 1. Most vacuum isolation valves are small in size and cannot meet the charging requirements of large vacuum induction melting furnaces; 2. The compression of the valve plate, the main sealing component of the vacuum isolation valve, is completed only by the lifting cylinder, which cannot meet the compression force required by the large induction melting furnace; 3. Most vacuum induction furnaces lack dust-proof devices and cannot ensure the cleanliness of the interior of the mechanism. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a medium-to-large vacuum isolation valve suitable for vacuum metallurgical environments, which is suitable for large-scale continuous loading vacuum induction furnaces. The medium-to-large vacuum isolation valve proposed in the present invention can provide better sealing and locking effects for the valve plate, realize continuous and automatic loading, and has a certain dust prevention effect at the valve port.

[0005] To achieve the above object, the present invention adopts the following scheme, including a front valve body and a rear valve body connected to each other, the interior of the rear valve body is hollow, and the front valve body is provided with a valve port arranged along the vertical direction, and the valve port is communicated with the interior of the rear valve body; A water-cooled valve plate is arranged in the valve port, a valve plate pneumatic driving device for controlling the lifting and rotation of the water-cooled valve plate is arranged on the front valve body, a gear ring for pressing the water-cooled valve plate is arranged in the valve port, and a gear ring rotation pneumatic device for controlling the rotation of the gear ring is arranged on the front valve body; a pneumatic component for controlling the operation of the cylinder is arranged on the front valve body, and the valve plate starting driving device and the gear ring rotation pneumatic driving device are connected to the pneumatic component through an air circuit.

[0006] As a preferred solution of the present invention, the valve plate driving pneumatic device includes a valve plate lifting cylinder arranged on the front valve body along the valve port direction, the valve plate lifting cylinder is connected to a lifting shaft, and the lifting shaft is connected to the water-cooled valve plate through a rotating arm; a swing cylinder is arranged inside the front valve body, the swing cylinder is arranged in the horizontal direction, the telescopic rod of the swing cylinder is connected to the sliding key on the lifting shaft through a hinge mechanism, the sliding key is arranged at one end of the lifting shaft away from the valve plate lifting cylinder, a second bellows is connected to the middle of the lifting shaft, and the other end of the second bellows is connected to the water-cooled valve plate through an elbow; The valve plate lifting cylinder is connected to the pneumatic component.

[0007] As another preferred embodiment of the present invention, an upper sealing seat and a lower sealing seat are respectively provided at the upper and lower parts of the lifting shaft, and the upper sealing seat and the lower sealing seat are provided at the connection between the lifting shaft and the front valve body.

[0008] As a third preferred embodiment of the present invention, a cooling water channel is arranged inside the lifting shaft, and the cooling water channel is connected with the second bellows, the elbow and the inside of the water-cooled valve body in sequence. A cooling water inlet is opened on the lifting shaft, and the cooling water inlet is connected to an external cooling water pipeline.

[0009] As a fourth preferred embodiment of the present invention, the ring gear rotating pneumatic device includes a ring gear rotating cylinder, which is arranged on the outside of the front valve body through a swing cylinder frame, and the ring gear rotating cylinder is arranged in a horizontal direction. The telescopic rod of the ring gear rotating cylinder is connected to the ring gear through a third bellows and a hinge mechanism; the ring gear rotating cylinder is connected to the pneumatic component.

[0010] As the fifth preferred embodiment of the present invention, a plurality of fixed blocks are evenly arranged on one side of the gear ring close to the water-cooled valve plate, an inclined wedge is arranged on the fixed block, and a corresponding number of fixed grooves are arranged on the water-cooled valve plate, and the fixed grooves match the shape of the inclined wedge.

[0011] As the sixth preferred scheme of the present invention, an upper flange is arranged on the front valve body outside the valve port, a protective cylinder for dust prevention is arranged inside the valve port, a connecting ring is sleeved on the outside of the protective cylinder, a protective cylinder lifting cylinder is arranged on the upper flange, and the telescopic rod of the protective cylinder lifting cylinder is connected to the connecting ring through a hinge mechanism; the protective cylinder lifting cylinder is connected to the pneumatic component.

[0012] As the seventh preferred scheme of the present invention, a first bellows is provided on the outer sleeve of the protective tube, and one end of the first bellows close to the front valve body is fixedly connected to the upper flange, and a plurality of lifting seats are provided at the end of the first bellows away from the front valve body, and the upper flange is fixed with the same number of feeding drive cylinders as the lifting seats, and the telescopic rod of the feeding drive cylinder is arranged in the vertical direction toward the side away from the front valve body, and the telescopic rod of the feeding drive cylinder is connected to the lifting seat; the feeding drive cylinder is connected to the pneumatic component.

[0013] Furthermore, a magnetic switch for detecting the movement of the piston rod is provided on the cylinder body of each cylinder.

[0014] Furthermore, a speed regulating valve is provided at the air inlet and outlet of each cylinder, and the length of the air path connecting each cylinder and the pneumatic component is as similar as possible. By adjusting the speed regulating valve, the movement of each cylinder is ensured to be as synchronized as possible.

[0015] Furthermore, a sealing system consisting of a plurality of O-rings is provided at the connection between the front valve body and the rear valve body and between each moving component part, which is stable and reliable.

[0016] Beneficial effects of the present invention: The medium and large vacuum isolation valve proposed in the present invention has five actions: valve plate lifting, valve plate rotation, gear ring rotation, bellows lifting and protective tube lifting. It is comprehensive in functions and easy to maintain. It can realize the function of controlling the vacuum degree of the vacuum chamber through a simple structure and has high reliability.

[0017] The present invention adopts the electromagnetic valve arranged on the front valve body to control each cylinder, and adopts a centralized arrangement, has a compact structure, is easy to maintain, is clean and leak-free, and is easy to control.

[0018] The water-cooled valve plate of the present invention adopts a locking ring for compression and sealing, which can meet the requirements of the inflation smelting process for reverse pressure sealing; by providing a protective cylinder driven to rise and fall by a cylinder, it can effectively prevent volatile substances generated during the smelting process from contaminating the inner surface of the valve body; by providing a flexible first bellows and a feeding drive cylinder, continuous automatic feeding can be achieved in conjunction with the feeding mechanism above the vacuum isolation valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 Schematic diagram of the gas path structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the planar structure of the transmission mechanism of the water-cooled valve plate and the gear ring of the present invention.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the transmission mechanism structure of the water-cooled valve plate and the gear ring of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of the pneumatic drive device for rotating the ring gear of the present invention.

[0024] Figure 6 It is a schematic diagram of the structure of the protection tube and the protection tube lifting mechanism of the present invention.

[0025] In the accompanying drawings, 1 is the front valve body, 2 is the rear valve body, 3 is the water-cooled valve plate, 4 is the upper flange, 5 is the first bellows, 6 is the protective cylinder, 7 is the valve plate lifting cylinder, 8 is the swing cylinder, 9 is the gear ring rotating cylinder, 10 is the lifting shaft, 11 is the protective cylinder lifting cylinder, 12 is the pneumatic component, 13 is the lifting seat, 14 is the sliding bearing, 15 is the upper sealing seat, 16 is the pressure ring, 17 is the sliding key, 18 is the positioning nail, 19 is the safety clip, 20 is the second bellows, 21 is the swivel arm, 22 is the hexagonal head bolt, 23 is the floating joint, 24 is the elbow, 25 is the third bellows, 26 is the swing cylinder frame, 27 is the gear ring, 28 is the fixed block, 29 is the wedge, 30 is the connecting ring, 31 is the lower sealing seat, and 32 is the feeding drive cylinder. DETAILED DESCRIPTION

[0026] The present invention adopts the following technical scheme: Figure 1 and Figure 2 As shown, it comprises a front valve body 1 and a rear valve body 2 connected to each other, the front valve body 1 and the rear valve body 2 are connected by bolts, and a sealing groove and a rubber ring are provided on the joint surface, and the two constitute the entire valve body; the rear valve body 2 is hollow inside to provide a rotation space, and the front valve body 1 is provided with a valve port arranged along the vertical direction, and the valve port is communicated with the inside of the rear valve body 2; A water-cooled valve plate 3 is arranged in the valve port, a valve plate pneumatic driving device for controlling the lifting and rotation of the water-cooled valve plate 3 is arranged on the front valve body 1, a gear ring 27 for pressing the water-cooled valve plate 3 is arranged in the valve port, and a gear ring rotation pneumatic device for controlling the rotation of the gear ring 27 is arranged on the front valve body 1; a pneumatic component 12 for controlling the operation of the cylinder is arranged on the front valve body 1, the pneumatic component 12 includes an inflation port, an exhaust port and a vacuum and pressure detection device, and the valve plate starting driving device and the gear ring rotation pneumatic driving device are connected to the pneumatic component 12 through an air circuit.

[0027] The valve plate pneumatic drive device can control the lifting and lowering of the water-cooled valve plate 3 in the valve port and the rotation of the water-cooled valve plate 3 between the valve port and the inside of the rear valve body 2 to realize the opening and closing of the valve port, and realize the sealing and locking of the water-cooled valve plate 3 by controlling the rotation of the gear ring 27, providing a stronger locking effect and meeting the requirements of the inflation smelting process for reverse pressure sealing.

[0028] As a preferred embodiment of the present invention, Figure 3 and Figure 4As shown, the valve plate driving pneumatic device includes a valve plate lifting cylinder 7 arranged on the front valve body 1 along the valve port direction, the valve plate lifting cylinder 7 is connected to a lifting shaft 10, and the lifting shaft 10 is connected to the water-cooled valve plate 3 through a rotating arm 21. The water-cooled valve plate 3 and the rotating arm 21 are connected through a floating joint 23 with a ball hinge structure and a hexagonal bolt 22, which can well compensate for swing and rotation errors; a swing cylinder 8 is arranged inside the front valve body 1, and the swing cylinder 8 is arranged in the horizontal direction. The telescopic rod of the swing cylinder 8 is connected by The hinge mechanism is connected to the sliding key 17 on the lifting shaft 10. The sliding key 17 is arranged at one end of the lifting shaft 10 away from the valve plate lifting cylinder 7. A second bellows 20 is connected to the middle of the lifting shaft 10. The other end of the second bellows 20 is connected to the water-cooled valve plate 3 through an elbow 24. The valve plate lifting cylinder 7 drives the lifting shaft 10 to extend and retract, thereby driving the water-cooled valve plate 3 to rise and fall in the vertical direction. The lifting shaft 10 is driven to rotate through the extension and retraction of the swing cylinder 8 and the hinge mechanism, thereby driving the water-cooled valve plate 3 to rotate in the horizontal direction. The valve plate lifting cylinder 7 is connected to the pneumatic component 12 .

[0029] As another preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, the upper and lower parts of the lifting shaft 10 are respectively provided with an upper sealing seat 15 and a lower sealing seat 31. The upper sealing seat 15 and the lower sealing seat 31 are arranged at the connection between the lifting shaft 10 and the front valve body 1. Sliding bearings 14 are arranged on the inner sides of the upper sealing seat 15 and the lower sealing seat 31. Pressure rings 16 are arranged at the upper sealing seat 15 and the lower sealing seat 31. The above structure is arranged to ensure dynamic sealing during the movement of the lifting shaft 10.

[0030] As a third preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, a cooling water channel is arranged inside the lifting shaft 10, and the cooling water channel is connected with the second bellows 20, the elbow 24 and the inside of the water-cooled valve body 3 in sequence. A cooling water inlet is opened on the lifting shaft 10, and the cooling water inlet is connected to an external cooling water pipeline through a safety clip 19 and a positioning pin 18.

[0031] The interior of the lifting shaft 10 is a hollow structure, and cooling water is introduced into the cooling water inlet of the lifting shaft 10 through the external cooling water pipeline and the safety clamp 19. The cooling water enters the water-cooled valve plate 3 through the cooling water channel, the second bellows 20 and the elbow 24, providing necessary cooling for the water-cooled valve plate 3 to prevent the reliability from being greatly reduced due to heat radiation.

[0032] As a fourth preferred embodiment of the present invention, Figure 5As shown, the gear ring rotating pneumatic device includes a gear ring rotating cylinder 9, which is arranged on the outside of the front valve body 1 through a swing cylinder frame 26, and the gear ring rotating cylinder 9 is arranged in the horizontal direction. The telescopic rod of the gear ring rotating cylinder 9 is connected to the gear ring 27 through a third bellows 25 and a hinge mechanism, and the telescopic rod of the gear ring rotating cylinder 9 drives the gear ring 27 to rotate horizontally between the rear valve body 2 and the valve port; the gear ring rotating cylinder 9 is connected to the pneumatic component 12.

[0033] As a fifth preferred embodiment of the present invention, Figure 5 As shown, a plurality of fixing blocks 28 are evenly arranged on one side of the gear ring 27 close to the water-cooling valve plate 3 , and an inclined wedge 29 is arranged on the fixing block 28 . A corresponding number of fixing grooves are arranged on the water-cooling valve plate 3 , and the fixing grooves match the shape of the inclined wedge 29 .

[0034] The water-cooling valve plate 3 and the gear ring 27 are controlled to cooperate, and the fixing groove and the inclined wedge 29 are aligned and cooperated to form an inclined wedge mechanism locking, so as to realize the pressing action of the gear ring 27 on the water-cooling valve plate 3.

[0035] As a sixth preferred embodiment of the present invention, Figure 6 As shown, an upper flange 4 is provided on the front valve body 1 outside the valve port, a protective tube 6 for dust prevention is provided inside the valve port, a connecting ring 30 is sleeved on the outside of the protective tube 6, a protective tube lifting cylinder 11 is provided on the upper flange 4, and the telescopic rod of the protective tube lifting cylinder 11 is connected to the connecting ring 30 through a hinge mechanism; the protective tube lifting cylinder 11 is connected to the pneumatic component 12.

[0036] By providing the protection tube 6 driven by the protection tube lifting cylinder 11, it is possible to effectively prevent the volatile substances generated during the smelting process from contaminating the inner surface of the valve body.

[0037] As a seventh preferred embodiment of the present invention, Figure 4 As shown, the protective tube 6 is outerly provided with a first bellows 5, and the end of the first bellows 5 close to the front valve body 1 is fixedly connected to the upper flange 4, and the end of the first bellows 5 away from the front valve body 1 is provided with a plurality of lifting seats 13, and the upper flange 4 is fixed with the same number of feeding drive cylinders 32 as the lifting seats 13, and the telescopic rod of the feeding drive cylinder 32 is arranged in the vertical direction toward the side away from the front valve body 1, and the telescopic rod of the feeding drive cylinder 32 is connected to the lifting seat 13; the feeding drive cylinder 32 is connected to the pneumatic component 12.

[0038] The first bellows 5 is a flexible bellows. In order to drive the first bellows 5, four feeding driving cylinders 32 are provided. The feeding driving cylinders 32 are connected to the lifting seat 13 on the first bellows 5 to drive the first bellows 5 to rise and fall, and cooperate with the feeding mechanism above the vacuum isolation valve to realize continuous feeding action and ensure the sealing switching during the continuous feeding action.

[0039] Furthermore, a magnetic switch for detecting the movement of the piston rod is provided on the cylinder body of each cylinder.

[0040] Furthermore, a speed regulating valve is provided at the air inlet and outlet of each cylinder, and the length of the air path connecting each cylinder and the pneumatic component is as similar as possible. By adjusting the speed regulating valve, the movement of each cylinder is ensured to be as synchronized as possible.

[0041] Furthermore, a sealing system consisting of a plurality of O-rings is provided at the connection between the front valve body 1 and the rear valve body 2 and between each moving component part, which is stable and reliable.

[0042] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A medium to large vacuum isolation valve, characterized in that: It comprises a front valve body (1) and a rear valve body (2) which are connected to each other, the rear valve body (2) is hollow inside, the front valve body (1) is provided with a valve port arranged in a vertical direction, and the valve port is communicated with the inside of the rear valve body (2); A water-cooled valve plate (3) is arranged in the valve port, a valve plate pneumatic drive device for controlling the lifting and rotation of the water-cooled valve plate (3) is arranged on the front valve body (1), a gear ring (27) for pressing the water-cooled valve plate (3) is arranged in the valve port, and a gear ring rotation pneumatic device for controlling the rotation of the gear ring (27) is arranged on the front valve body (1); a pneumatic assembly (12) for controlling the operation of the cylinder is arranged on the front valve body (1), and the valve plate starting drive device and the gear ring rotation pneumatic drive device are connected to the pneumatic assembly (12) via an air circuit.

2. A medium to large vacuum isolation valve as claimed in claim 1, characterized in that: The valve plate driving pneumatic device comprises a valve plate lifting cylinder (7) arranged on the front valve body (1) along the valve port direction, the valve plate lifting cylinder (7) being connected to a lifting shaft (10), and the lifting shaft (10) being connected to the water-cooled valve plate (3) via a rotating arm (21); a swing cylinder (8) being arranged inside the front valve body (1), the swing cylinder (8) being arranged along the horizontal direction, the telescopic rod of the swing cylinder (8) being connected to a sliding key (17) on the lifting shaft (10) via a hinge mechanism, the sliding key (17) being arranged at one end of the lifting shaft (10) away from the valve plate lifting cylinder (7), a second bellows (20) being connected to the middle of the lifting shaft (10), and the other end of the second bellows (20) being connected to the water-cooled valve plate (3) via an elbow (24); The valve plate lifting cylinder (7) is connected to the pneumatic component (12).

3. A medium to large vacuum isolation valve as claimed in claim 2, characterized in that: An upper sealing seat (15) and a lower sealing seat (31) are respectively provided at the upper and lower parts of the lifting shaft (10); the upper sealing seat (15) and the lower sealing seat (31) are provided at the connection between the lifting shaft (10) and the front valve body (1).

4. A medium to large vacuum isolation valve as claimed in claim 2, characterized in that: A cooling water channel is provided inside the lifting shaft (10), the cooling water channel is sequentially connected to the second bellows (20), the elbow (24) and the inside of the water-cooled valve body (3), and a cooling water inlet is provided on the lifting shaft (10), the cooling water inlet is connected to an external cooling water pipeline.

5. A medium to large vacuum isolation valve as claimed in claim 1, characterized in that: The ring gear rotating pneumatic device comprises a ring gear rotating cylinder (9), the ring gear rotating cylinder (9) being arranged on the outside of the front valve body (1) via a swing cylinder frame (26), the ring gear rotating cylinder (9) being arranged in a horizontal direction, the telescopic rod of the ring gear rotating cylinder (9) being connected to the ring gear (27) via a third bellows (25) and a hinge mechanism; the ring gear rotating cylinder (9) is connected to the pneumatic assembly (12).

6. A medium to large vacuum isolation valve as claimed in claim 1, characterized in that: A plurality of fixing blocks (28) are evenly arranged on one side of the gear ring (27) close to the water-cooling valve plate (3), an inclined wedge (29) is arranged on the fixing block (28), and a corresponding number of fixing grooves are arranged on the water-cooling valve plate (3), the fixing grooves matching the shape of the inclined wedges (29).

7. A medium to large vacuum isolation valve as claimed in claim 1, characterized in that: An upper flange (4) is arranged on the front valve body (1) outside the valve port, a dustproof protective tube (6) is arranged inside the valve port, a connecting ring (30) is sleeved on the outside of the protective tube (6), a protective tube lifting cylinder (11) is arranged on the upper flange (4), and a telescopic rod of the protective tube lifting cylinder (11) is connected to the connecting ring (30) via a hinge mechanism; the protective tube lifting cylinder (11) is connected to a pneumatic component (12).

8. A medium to large vacuum isolation valve as claimed in claim 7, characterized in that: A first bellows (5) is provided on the outer sleeve of the protective tube (6); one end of the first bellows (5) close to the front valve body (1) is fixedly connected to the upper flange (4); one end of the first bellows (5) away from the front valve body (1) is provided with a plurality of lifting seats (13); the upper flange (4) is fixed with a feeding drive cylinder (32) having the same number as the lifting seats (13); the telescopic rod of the feeding drive cylinder (32) is arranged in a vertical direction toward the side away from the front valve body (1); the telescopic rod of the feeding drive cylinder (32) is connected to the lifting seat (13); and the feeding drive cylinder (32) is connected to the pneumatic component (12).

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