Air seal stop valve

Abstract

A driving assembly is arranged on one side of a valve body, the driving assembly is rotationally connected with the valve body, extends into the valve body and is fixedly connected with a valve plate, and the driving assembly can drive the valve plate to rotate along the axis of the valve body; the cleaning assembly is arranged in one side of the valve seat, one working end face of the cleaning assembly abuts against the side face, away from the axis of the valve body, of the valve plate, and the other working end face of the cleaning assembly faces the abutting position of the valve plate and the valve seat. The driving assembly extends into the valve body and is fixedly connected with the valve plate. When the actuator is started, the valve plate rotates around the axis of the valve body to achieve opening or closing action, the cleaning assembly adopts the design of double working end faces, the cleaning assembly abuts against the end face of one side of the outer edge of the valve plate to guarantee the sealing effect of the valve seat and the valve body, and the cleaning assembly faces the sealing face of the valve plate and the end face of one side of a medium channel opening of the valve body to achieve cleaning of the surface of the valve plate. Dust is prevented from accumulating on the outer edge of the valve plate or gaps of the valve seat, and manual dust cleaning frequency is reduced.

Description

Technical Field

[0001] This application relates to the technical field of valves, and particularly to a pneumatically sealed cut-off valve. Background Art

[0002] The cut-off valve is a main component in furnace smelting. Its main function is to regulate and cut off the materials and gases in the furnace by controlling the opening and closing of the valve.

[0003] In the prior art, blast furnace gas carries a large amount of dust, which is likely to accumulate on the inner wall of the valve box and the gaps between the valve plates, resulting in valve jamming or poor closing. Although the valve box is equipped with a purging device, there is a lack of self-cleaning structure on the valve plate surface and its gaps in the valve box, and manual ash cleaning is still required regularly. The maintenance efficiency is low and there are safety hazards. Moreover, the traditional valve box sealing structure relies on a fixed pressing force. After long-term operation, gaps are likely to appear due to material deformation or wear, and the sealing pressure cannot be automatically compensated, so frequent manual adjustment is needed.

[0004] Therefore, there is an urgent need for a pneumatically sealed cut-off valve to solve the above problems. Summary of the Invention

[0005] Embodiments of this application provide a pneumatically sealed cut-off valve, aiming to be able to automatically clean the sealing surfaces of the valve seat and the valve plate to reduce the frequency of manual ash cleaning, and at the same time ensure the sealing effect between the valve seat and the valve plate.

[0006] To achieve the above object, this application provides the following technical solutions:

[0007] A pneumatically sealed cut-off valve includes a valve body, a valve seat installed on the valve body, and a valve plate located inside the valve body for opening or closing the medium flow, and further includes a driving component and a cleaning component;

[0008] The driving component is arranged on one side of the valve body. The working end of the driving component is rotationally connected to one side of the valve body, and it extends into the valve body and is fixedly connected to one side surface of the valve plate close to the axis of the valve body, and can drive the valve plate to rotate along the axis of the valve body;

[0009] The cleaning component is arranged inside one side of the valve seat close to the medium channel opening of the valve body. One working end surface of the cleaning component abuts against one side surface of the valve plate far from the axis of the valve body, and the other working end surface of the cleaning component faces the sealing surface of the valve plate and the medium channel opening of the valve body.

[0010] Further, the driving component includes a rocker arm, a rotating shaft, a fixed disk, a mounting seat, a swing arm, and a hydraulic cylinder;

[0011] One end of the rocker arm is fixedly connected to one side surface of the valve plate close to the axis of the valve body, and the other end extends vertically to the middle of the valve body and is concentric with the axis of the valve body;

[0012] The mounting seats are arranged at intervals on the side of the valve body and are rotatably connected to the end of the rotating shaft away from the valve body. A groove is provided at the top of the mounting seat;

[0013] The inner end of the rotating shaft extends into the interior of the valve body and is fixedly connected to the end of the rocker arm away from the valve plate. Its outer end extends horizontally into the cavity of the groove;

[0014] The fixing disk is arranged on the circumference of the rotating shaft and is fixedly connected to the circumferential surface of the valve body;

[0015] One end of the swing arm extends into the groove and is fixedly connected to the outer end of the rotating shaft. The other end extends vertically towards the notch of the groove along the radial direction of the rotating shaft;

[0016] One end of the hydraulic cylinder is fixedly connected to the end of the swing arm away from the rotating shaft. The other end extends along the swinging direction of the swing arm and is hinged to the mounting seat.

[0017] Furthermore, an air duct for supplying to the cleaning component is provided inside the valve seat. An air chamber for installing the cleaning component is provided inside the side of the valve seat close to the medium passage opening of the valve body. The air duct is communicated with the air chamber.

[0018] Furthermore, the cleaning component includes a first air pipe, a second air pipe, an airbag and a sealing gasket;

[0019] One end of the first air pipe is communicated with the end of the air duct leading to the outside of the valve seat, and the other end is communicated with an external air source;

[0020] The second air pipe is arranged in the space of the air chamber. One end of the second air pipe is communicated with the air duct;

[0021] The airbag is arranged in the air chamber and is located below the second air pipe. The input end of the airbag is connected to the other end of the second air pipe;

[0022] The sealing gasket is arranged on the periphery of the airbag, and the circumferential surface of the sealing gasket fits with the end face of the side of the valve seat close to the medium passage opening of the valve body;

[0023] Among them, the airbag includes a bladder and a housing;

[0024] The input end of the bladder is communicated with the end of the second air pipe away from the air duct;

[0025] The housing covers the periphery of the bladder. The cover opening of the housing is fixedly connected to the circumferential surface of the second air pipe and forms a sealing fit. The end face of the side of the housing away from the second air pipe abuts against the side face of the valve plate away from the axis of the valve body. A plurality of air holes are provided on the end face of the side of the housing close to the medium passage opening of the valve body for purging the sealing surface between the valve seat and the valve plate.

[0026] Furthermore, an installation groove is provided at the connection between the valve seat and the valve body. The cross-sectional profile of the installation groove is an M-shaped structure, and the notch of the installation groove faces the end face of the valve body. An elastic sealing ring is arranged in the installation groove, and the peripheral surface of the elastic sealing ring abuts against the wall of the installation groove to form a sealing fit.

[0027] Furthermore, the axis of the end of the swing arm located in the groove, the axis of the rotating shaft, and the axis of the end of the rocker arm far from the valve plate are coaxial with the axis of the valve body.

[0028] Furthermore, the end face of the outer shell away from the second air pipe protrudes from the end face of the sealing gasket close to the valve plate.

[0029] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0030] In this application, the driving component extends into the valve body and is fixedly connected to the valve plate. When the actuator is started, the valve plate rotates around the axis of the valve body to achieve opening (the valve plate is separated from the valve seat and the medium flows through) or closing (the valve plate is attached to the valve seat and the medium is blocked) actions. The cleaning component adopts a double working end face design. One end face that abuts against the outer edge of the valve plate realizes the sealing between the valve plate and the valve body, ensuring the sealing effect between the valve seat and the valve plate. The other end face facing the sealing part between the valve plate and the valve seat realizes the cleaning of the surface of the valve plate before opening or after closing, ensuring the cleanliness of the sealing surface of the valve plate, avoiding the accumulation of dust at the outer edge of the valve plate or in the gap of the valve seat, and reducing the frequency of manual dust cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram in the assembled state provided by the embodiment of the present application;

[0033] Figure 2 For Figure 1 A partial enlarged schematic diagram of area A in;

[0034] Figure 3 It is a schematic structural diagram in the state where the partial cleaning component is not installed provided by the embodiment of the present application;

[0035] Figure 4 For Figure 3 A partial enlarged schematic diagram of area B in;

[0036] Figure 5Schematic structural diagram of the drive assembly in the test state provided by the embodiments of the present application.

[0037] Icon: 10 - valve body; 11 - valve seat; 111 - air passage; 112 - air chamber; 113 - mounting groove; 12 - valve plate; 13 - elastic sealing ring; 20 - drive assembly; 21 - rocker arm; 22 - rotating shaft; 23 - mounting seat; 231 - groove; 24 - fixed disk; 25 - swing arm; 26 - hydraulic cylinder; 30 - cleaning assembly; 31 - first air pipe; 32 - second air pipe; 33 - airbag; 331 - bladder; 332 - housing; 3321 - air hole; 34 - gasket. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0040] As Figures 1 - 5As shown in the figure, a pneumatic seal cut-off valve includes a valve body 10, a valve seat 11 installed on the valve body 10, and a valve plate 12 located inside the valve body 10 for opening or closing the medium flow. It also includes a driving component 20 and a cleaning component 30. The driving component 20 is arranged on one side of the valve body 10. The working end of the driving component 20 is rotatably connected to one side of the valve body 10, and it extends into the valve body 10 and is fixedly connected to one side surface of the valve plate 12 close to the axis of the valve body 10, and can drive the valve plate 12 to rotate along the axis of the valve body 10. The cleaning component 30 is arranged inside one side of the valve seat 11 close to the medium channel opening of the valve body 10. One working end surface of the cleaning component 30 abuts against one side surface of the valve plate 12 far from the axis of the valve body 10, and the other working end surface of the cleaning component 30 faces the sealing surface of the valve plate 12 and the medium channel opening of the valve body 10.

[0041] In the above solution, the driving component 20 extends into the valve body 10 and is fixedly connected to the valve plate 12. When the actuator starts, the valve plate 12 rotates around the axis of the valve body 10 to achieve the opening (the valve plate 12 is separated from the valve seat 11 and the medium flows) or closing (the valve plate 12 is attached to the valve seat 11 and the medium is blocked) actions. The cleaning component 30 is installed on one side of the valve seat 11 close to the medium channel opening, and its working end surface dynamically abuts against one side of the valve plate 12 far from the axis (i.e., the outer edge sealing surface of the valve plate 12). The cleaning component 30 adopts a double working end surface design. One end surface that abuts against the outer edge of the valve plate 12 realizes the sealing between the valve seat 11 and the valve plate 12, thereby ensuring the sealing effect between the valve seat 11 and the valve plate 12. The other end surface facing the sealing part between the valve plate 12 and the valve seat 11 realizes the cleaning of the surface of the valve plate 12 before opening or after closing, ensuring the cleanliness of the sealing surface of the valve plate 12, avoiding the accumulation of dust on the outer edge of the valve plate 12 or the gap of the valve seat 11, and reducing the frequency of manual ash cleaning.

[0042] The driving component 20 includes a rocker arm 21, a rotating shaft 22, a fixed disk 24, a mounting seat 23, a swing arm 25 and a hydraulic cylinder 26. One end of the rocker arm 21 is fixedly connected to one side surface of the valve plate 12 close to the axis of the valve body 10, and the other end extends vertically to the middle of the valve body 10 and is concentric with the axis of the valve body 10. The mounting seat 23 is arranged at intervals beside the valve body 10 and is rotatably connected to the end of the rotating shaft 22 far from the valve body 10. A groove 231 is provided at the top of the mounting seat 23. The inner end of the rotating shaft 22 extends into the valve body 10 and is fixedly connected to the end of the rocker arm 21 far from the valve plate 12, and its outer end extends horizontally into the cavity of the groove 231. The fixed disk 24 is arranged on the periphery of the rotating shaft 22 and is fixedly connected to the peripheral surface of the valve body 10. One end of the swing arm 25 extends into the groove 231 and is fixedly connected to the outer end of the rotating shaft 22, and the other end extends vertically along the radial direction of the rotating shaft 22 to the notch of the groove 231. One end of the hydraulic cylinder 26 is fixedly connected to the end of the swing arm 25 far from the rotating shaft 22, and the other end extends along the swinging direction of the swing arm 25 and is hinged to the mounting seat 23.

[0043] In the above solution, the hydraulic cylinder 26 serves as the power source, and the linear expansion and contraction of the piston rod are achieved through the change of oil pressure. The piston rod is hinged to the extended end of the swing arm 25, and its expansion and contraction direction is collinear with the swing trajectory of the swing arm 25, ensuring that the power is transmitted without eccentric load. One end of the swing arm 25 is rigidly connected to the outer end of the rotating shaft 22, and the other end is hinged to the piston rod of the hydraulic cylinder 26, forming a lever structure. When the hydraulic cylinder 26 expands and contracts, the swing arm 25 rotates around the outer end of the rotating shaft 22, and the thrust of the hydraulic cylinder 26 is converted into the torque of the rotating shaft 22 through the lever amplification effect. The rotating shaft 22 passes through the side wall of the valve body 10, and the inner end is fixedly connected to the rocker arm 21, and the outer end is fixedly connected to the swing arm 25. The rotational movement of the swing arm 25 is synchronously transmitted to the rocker arm 21 through the rotating shaft 22, causing the rocker arm 21 to swing around the axis of the valve body 10. One end of the rocker arm 21 is fixedly connected to the valve plate 12, and the other end is rigidly connected to the inner end of the rotating shaft 22. When the rotating shaft 22 rotates, the rocker arm 21 drives the valve plate 12 to rotate synchronously around the axis of the valve body 10, realizing the fitting (closing) or separation (opening) of the valve plate 12 and the valve seat 11, thereby ensuring that the valve plate 12 rotates without yaw, the sealing surfaces are in uniform contact, and leakage caused by local wear is avoided.

[0044] An air passage 111 for supplying to the cleaning assembly 30 is provided inside the valve seat 11, and an air chamber 112 for installing the cleaning assembly 30 is provided inside one side of the valve seat 11 close to the medium passage port of the valve body 10, and the air passage 111 is communicated with the air chamber 112.

[0045] In the above solution, the air passage 111 extends from the outside to the inside of the valve seat 11 and is connected to an external high-pressure gas source (such as nitrogen, compressed air or purified process gas) to introduce high-pressure gas into the inside of the valve seat 11. The air chamber 112 is located on one side of the valve seat 11 close to the medium passage port and is communicated with the air passage 111, serving as a buffer and distribution chamber for the gas. After the high-pressure gas enters the air chamber 112, the pressure tends to be uniform, providing a stable gas source for the cleaning assembly 30. The cleaning assembly 30 obtains the high-pressure gas through the interface of the air chamber 112 and blows it onto the sealing surface between the valve plate 12 and the valve seat 11 when the valve plate 12 is closed, forming a positive-pressure air curtain to wash away the residual dust and reducing the leakage risk caused by dust embedding.

[0046] When the valve plate 12 rotates to the closed position, the jet end face of the cleaning assembly 30 is aligned with the sealing surface, and the valve of the air chamber 112 (or solenoid valve) is synchronously opened, and the high-pressure gas is ejected to remove the dust on the sealing surface; when the valve plate 12 is opened, the jet end face is away from the sealing surface, and the valve of the air chamber 112 is closed to avoid gas waste.

[0047] Implementably, the staff can use an external gas source supply device to make the jet pressure and flow rate adjustable to adapt to the dust characteristics (such as particle size, humidity, adhesion) under different working conditions, ensuring a stable cleaning effect.

[0048] The cleaning assembly 30 includes a first air pipe 31, a second air pipe 32, an airbag 33 and a gasket 34; one end of the first air pipe 31 is communicated with the end of the air passage 111 leading to the outside of the valve seat 11, and the other end thereof is communicated with an external air source; the second air pipe 32 is arranged in the space of the air chamber 112, and one end of the second air pipe 32 is communicated with the air passage 111; the airbag 33 is arranged in the air chamber 112 and is located below the second air pipe 32, and the input end of the airbag 33 is connected to the other end of the second air pipe 32; the gasket 34 is arranged on the peripheral side of the airbag 33, and the peripheral surface of the gasket 34 is attached to the end surface of the valve seat 11 close to the medium passage port of the valve body 10; wherein, the airbag 33 includes a bladder 331 and a housing 332; the input end of the bladder 331 is communicated with the end of the second air pipe 32 far from the air passage 111; the housing 332 covers the peripheral side of the bladder 331, the covering port of the housing 332 is fixedly connected with the peripheral surface of the second air pipe 32 and forms a sealing fit, the end surface of the housing 332 far from the second air pipe 32 abuts against the side surface of the valve plate 12 far from the axis of the valve body 10, and a plurality of air holes 3321 are formed in the end surface of the housing 332 close to the medium passage port of the valve body 10 for purging the sealing surface between the valve seat 11 and the valve plate 12.

[0049] In the above solution, the first air pipe 31 connects the external air source (such as compressed air or inert gas) with the air passage 111 of the valve seat 11, and introduces high-pressure gas into the inside of the valve seat 11 as the power source of the cleaning system. The second air pipe 32 is located inside the air chamber 112, one end of which is communicated with the air passage 111, and the other end is connected to the input end of the bladder 331 of the airbag 33, and the high-pressure gas is directionally transported to the airbag 33, and the airbag 33 realizes periodic expansion and contraction through the charging and discharging of the second air pipe 32. When the high-pressure gas enters the bladder 331 through the second air pipe 32, the bladder 331 expands and continuously squeezes the air inside the cavity of the housing 332, and the squeezed air is discharged through the air holes 3321, and forms an air curtain on the sealing surface of the valve plate 12, flushing the contact area between the valve plate 12 and the valve seat 11 and the sealing surface of the valve, ensuring the cleanliness of the sealing surface of the valve plate 12. And at this time, the end surface of the housing 332 close to the outer edge of the valve plate 12 abuts against the valve plate 12 to prevent dust from entering the inside of the valve body 10.

[0050] Implementably, a baffle is arranged above the area where the plurality of air holes 3321 are arranged. One end of the baffle is hinged to the housing 332, and the other end thereof freely extends towards the side close to the valve plate 12, and the plate area of the baffle is larger than the area where the plurality of air holes 3321 are arranged. When it is necessary to purge the valve plate 12, the air flow ejects through the air holes 3321 and jacks up the baffle, so that the air flow is further compressed, increasing the purging intensity of the air flow on the sealing surface of the valve plate 12, and further ensuring the purging effect of the sealing surface of the valve plate 12. When the purging stops, the baffle blocks the air holes 3321 again due to the lack of the pushing action of the air flow, preventing dust from flowing back and blocking the air holes 3321.

[0051] An installation groove 113 is provided at the connection between the valve seat 11 and the valve body 10. The cross-sectional profile of the installation groove 113 is in an M-shaped structure, and the notch of the installation groove 113 faces the end face of the valve body 10. An elastic sealing ring 13 is arranged in the installation groove 113. The peripheral surface of the elastic sealing ring 13 abuts against the wall of the installation groove 113 and forms a sealing fit.

[0052] In the above solution, the cross-section of the installation groove 113 is M-shaped (double-peak and double-valley structure), which consists of two side protrusions (peak parts) and an intermediate groove 231 (valley part), and the notch faces the end face of the valve body 10. The protrusion part forms a radial limit for the elastic sealing ring 13, and the groove 231 part provides an axial compression space for the sealing ring to ensure that the sealing ring is stably embedded under the pre-tightening force. During installation, the valve seat 11 and the valve body 10 are pressed tightly by the bolt pre-tightening force. The elastic sealing ring 13 is axially extruded, generating radial expansion, filling the gap between the protrusion and the groove 231 of the M-shaped groove, and forming an initial seal. The peripheral surface of the sealing ring and the wall of the M-shaped groove (including the peak part and the valley part) form a triple-contact seal (two side peak parts + bottom valley part), improving the sealing reliability.

[0053] The axis of the end of the swing arm 25 located in the groove 231, the axis of the rotating shaft 22, the axis of the end of the rocker arm 21 far from the valve plate 12, and the axis of the valve body 10 are coaxially arranged.

[0054] In the above solution, the swing arm 25 (the end connected to the rotating shaft 22), the axis of the rotating shaft 22, the rocker arm 21 (the end far from the valve plate 12), and the axis of the valve body 10 are collinear, forming a single rotation axis 22 line, ensuring that all components rotate around the same axis, ensuring that the opening and closing actions of the valve plate 12 are completely consistent with the driving input, avoiding bearing wear caused by eccentric loading, and at the same time eliminating the risk of jamming or leakage of the valve plate 12 caused by asynchronous movement.

[0055] The end face of the outer shell 332 far from the second air pipe 32 protrudes from the end face of the sealing gasket 34 close to the valve plate 12.

[0056] In the above solution, the end face (sealing surface) of the sealing gasket 34 close to the valve plate 12 is lower than the end face (reference surface) of the outer shell 332 far from the second air pipe 32, forming a height difference, ensuring that the medium pressure directly acts on the sealing gasket 34, and at the same time absorbing vibration energy and reducing fatigue wear of the sealing surface.

[0057] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0058] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A gas seal cut-off valve, comprising a valve body (10), a valve seat (11) installed on the valve body (10), and a valve plate (12) located inside the valve body (10) for opening or closing the medium flow, characterized in that, It further includes a driving component (20) and a cleaning component (30); The driving component (20) is arranged on one side of the valve body (10). The working end of the driving component (20) is rotatably connected to one side of the valve body (10), and it extends into the valve body (10) and is fixedly connected to one side surface of the valve plate (12) close to the axis of the valve body (10), capable of driving the valve plate (12) to rotate along the axis of the valve body (10); The cleaning component (30) is arranged inside one side of the valve seat (11) close to the medium passage opening of the valve body (10). One working end surface of the cleaning component (30) abuts against one side surface of the valve plate (12) away from the axis of the valve body (10), and the other working end surface of the cleaning component (30) faces the sealing surface of the valve plate (12) and the medium passage opening of the valve body (10).

2. The air seal cut-off valve according to claim 1, characterized in that, The driving component (20) includes a rocker arm (21), a rotating shaft (22), a fixed disk (24), a mounting seat (23), a swing arm (25) and a hydraulic cylinder (26); One end of the rocker arm (21) is fixedly connected to one side surface of the valve plate (12) close to the axis of the valve body (10), and the other end extends vertically to the middle of the valve body (10) and is concentric with the axis of the valve body (10); The mounting seat (23) is arranged at intervals beside the valve body (10) and is rotatably connected to the end of the rotating shaft (22) away from the valve body (10). A groove (231) is arranged at the top of the mounting seat (23); The inner end of the rotating shaft (22) extends into the valve body (10) and is fixedly connected to the end of the rocker arm (21) away from the valve plate (12), and its outer end extends horizontally into the cavity of the groove (231); The fixed disk (24) is arranged on the periphery of the rotating shaft (22) and is fixedly connected to the peripheral surface of the valve body (10); One end of the swing arm (25) extends into the groove (231) and is fixedly connected to the outer end of the rotating shaft (22), and the other end extends vertically along the radial direction of the rotating shaft (22) towards the notch of the groove (231); One end of the hydraulic cylinder (26) is fixedly connected to the end of the swing arm (25) away from the rotating shaft (22), and the other end extends along the swinging direction of the swing arm (25) and is hinged to the mounting seat (23).

3. The air seal cut-off valve according to claim 1, characterized in that, An air passage (111) for supplying to the cleaning component (30) is arranged inside the valve seat (11). An air chamber (112) for installing the cleaning component (30) is arranged inside one side of the valve seat (11) close to the medium passage opening of the valve body (10). The air passage (111) is communicated with the air chamber (112).

4. The air seal cut-off valve according to claim 3, characterized in that, The cleaning component (30) includes a first air pipe (31), a second air pipe (32), an airbag (33) and a sealing gasket (34); One end of the first air pipe (31) is communicated with the end of the air passage (111) leading to the outside of the valve seat (11), and the other end is communicated with an external air source; The second air pipe (32) is arranged in the space of the air chamber (112), and one end of the second air pipe (32) is communicated with the air passage (111); The airbag (33) is arranged in the air chamber (112) and is located below the second air pipe (32). The input end of the airbag (33) is connected to the other end of the second air pipe (32); The gasket (34) is arranged on the periphery of the airbag (33), and the peripheral surface of the gasket (34) is attached to the end surface of the valve seat (11) on the side close to the medium passage port of the valve body (10); Wherein, the airbag (33) includes a bladder (331) and a housing (332); The input end of the bladder (331) is communicated with one end of the second air pipe (32) far from the air passage (111); The housing (332) covers the periphery of the bladder (331). The cover opening of the housing (332) is fixedly connected to the peripheral surface of the second air pipe (32) and forms a sealing fit. One end surface of the housing (332) far from the second air pipe (32) abuts against one side surface of the valve plate (12) far from the axis of the valve body (10). A plurality of air holes (3321) are formed in one end surface of the housing (332) close to the medium passage port of the valve body (10) for purging the sealing surface between the valve seat (11) and the valve plate (12).

5. The air seal cut-off valve according to claim 1, characterized in that, An installation groove (113) is arranged at the connection between the valve seat (11) and the valve body (10). The cross-sectional profile of the installation groove (113) is an M-shaped structure, and the notch of the installation groove (113) faces the end surface of the valve body (10). An elastic sealing ring (13) is arranged in the installation groove (113). The peripheral surface of the elastic sealing ring (13) abuts against the wall of the installation groove (113) and forms a sealing fit.

6. The air seal cut-off valve according to claim 2, characterized in that, The axis of the end of the swing arm (25) located in the groove (231) and the axis of the rotating shaft (22) are coaxial with the axis of the end of the rocker arm (21) far from the valve plate (12) and the axis of the valve body (10).

7. The air seal cut-off valve according to claim 4, characterized in that, One end surface of the housing (332) far from the second air pipe (32) protrudes from one end surface of the gasket (34) close to the valve plate (12).

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