Metal sealing butterfly valve position indicating device capable of being automatically opened and closed

Abstract

The invention belongs to the technical field of valves, and provides an automatic opening and closing metal sealing butterfly valve position indicating device which comprises a valve body, a mounting box is fixedly mounted on the valve body, a cover plate is arranged on the mounting box, a butterfly plate is rotatably mounted in the valve body through a valve rod, the valve rod extends into the mounting box, and a worm gear is fixedly mounted at the upper end of the valve rod. The worm gear is meshed with a worm rotationally mounted in the mounting box, and a power assembly for driving the worm to rotate is arranged in the mounting box; and a top plate is rotationally mounted on the cover plate. Compared with the prior art, the valve has the following beneficial effects that the rotation angle of the butterfly plate is observed through matching of the second limiting column and the scales on the cover plate, so that the opening degree of the valve position of the valve is reflected, and it is guaranteed that the butterfly plate cannot continue to rotate after the valve is completely opened or closed through matching of the second limiting column and the limiting frame; and the accuracy of completely closing or opening the valve is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a valve position indicating device for an automatically opened and closed metal-sealed butterfly valve. Background Art

[0002] The butterfly valve is also called a flap valve. Its opening and closing part is the butterfly plate, which rotates around the valve stem to achieve the purpose of opening and closing. The triple-eccentric butterfly valve refers to a butterfly valve in which the valve stem axis deviates from the center of the butterfly plate and the center of the body at the same time, and the valve seat rotation axis and the valve body channel axis have a certain angle.

[0003] When a butterfly valve is in use, the size of its valve opening will affect the flow rate of the internal medium, so it is necessary to know the valve position of the valve specifically. Most existing butterfly valves are equipped with a pointer connected to the valve stem when in use. When the valve stem rotates, the pointer rotates accordingly. The valve position is judged by manually observing the position of the pointer. Although it can indicate the valve position of the valve, it cannot restrict the valve stem when the valve needs to be completely closed or opened, and manual observation of the pointer is also inaccurate, which results in the valve being unable to be completely opened or closed, reducing the accuracy of the valve position indication. Summary of the invention

[0004] The purpose of the present invention is to provide a valve position indicating device for a metal-sealed butterfly valve that opens and closes automatically, aiming to solve the technical problem in the prior art that the valve stem cannot be restricted when the valve is closed or opened, thereby reducing the accuracy of the valve position indication.

[0005] The present invention is implemented as follows: an automatically opened and closed metal-sealed butterfly valve position indicating device comprises a valve body, a mounting box is fixedly mounted on the valve body, a cover plate is arranged on the mounting box, a disc plate is rotatably mounted in the valve body through a valve stem, the valve stem extends into the mounting box and a worm gear is fixedly mounted on the upper end of the valve stem, the worm gear meshes with a worm rotatably mounted in the mounting box, and a power assembly for driving the worm to rotate is arranged in the mounting box;

[0006] A top plate is rotatably mounted on the cover plate, the top plate is coaxially arranged with the worm gear, a limiting cylinder is fixedly mounted on the surface of the top plate close to the worm gear, a first limiting column extending into the limiting cylinder is fixedly mounted on the worm gear, a second limiting column is fixedly mounted on the surface of the top plate away from the worm gear, and two sets of limiting frames used in conjunction with the second limiting columns are fixedly mounted on the cover plate.

[0007] Further technical solution: the two groups of limiting frames are spaced ninety degrees apart and the second limiting column moves between zero and ninety degrees.

[0008] Further technical solution: The horizontal section of the limit frame is slidably mounted with a second indicator plate, the second indicator plate passes through the limit frame and second magnetic blocks are fixedly mounted at both ends of the second indicator plate, the second magnetic block is used in conjunction with the second limit column and the second limit column is made of magnetic material.

[0009] Further technical solution: The power assembly includes a rack arranged in an installation box, and two groups of racks are provided and located at both ends of the worm. The rack is meshed with a gear fixedly installed at the end of the worm. Connecting rods are fixedly installed at both ends of the rack. A first piston plate is fixedly installed at one end of the connecting rod away from the rack. The first piston plate is slidably connected to a piston cylinder fixedly installed in the installation box, and one end of the piston cylinder away from the rack is connected to an external air supply device.

[0010] Further technical solution: connecting plates are fixedly installed at both ends of the rack, support rods distributed along the length direction of the rack are fixedly installed in the installation box, and the connecting plates are slidably installed on the support rods.

[0011] Further technical solution: U-shaped mobile frames are slidably installed on both sides of the installation box, and an adjusting screw is rotatably installed on the side of the installation box to drive the mobile frame to move. One end of the mobile frame located in the installation box is used in conjunction with the connecting plate.

[0012] Further technical solution: a first indicator plate is slidably installed in the parallel section of the movable frame, both ends of the first indicator plate pass through the movable frame, a card slot is opened at the end of the movable frame located in the installation box, a first magnetic block is fixedly installed at one end of the first indicator plate located in the card slot, the first magnetic block is used in conjunction with a connecting plate and the connecting plate is made of magnetic material.

[0013] Further technical solution: a mounting plate is fixedly installed in the mounting box, a connecting cylinder is fixedly installed on the mounting plate, a partition is fixedly installed in the connecting cylinder, two groups of second piston plates located on both sides of the partition are slidably installed in the connecting cylinder, an elastic part is fixedly installed on the second piston plate, one end of the elastic part away from the second piston plate is fixedly connected to the mounting plate, and two areas in the connecting cylinder are correspondingly connected to the piston cylinders at both ends of the mounting box.

[0014] Further technical solution: A vertical rod is fixedly installed on the second piston plate, which extends away from the mounting plate and passes through the connecting tube. A first friction plate is fixedly installed on the end of the vertical rod away from the second piston plate. The first friction plate is used in conjunction with a second friction plate fixedly installed on the worm gear.

[0015] Further technical solution: the connecting tube is respectively connected to a first branch pipe, a second branch pipe, a third branch pipe and a fourth branch pipe, the first branch pipe and the third branch pipe are respectively connected to an area inside the connecting tube, the first branch pipe and the third branch pipe are connected to an external gas supply device at one end away from the connecting tube, the second branch pipe and the fourth branch pipe are respectively connected to an area inside the connecting tube, and under normal conditions, the second piston plate blocks the connection between the second branch pipe, the fourth branch pipe and the connecting tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the worm gear rotates, the top plate is driven to rotate synchronously through the first limit post and the limit cylinder, and the top plate drives the second limit post to rotate synchronously. The rotation angle of the disc plate is observed through the cooperation of the second limit post and the scale on the cover plate, thereby reflecting the opening degree of the valve position. When the disc plate needs to be rotated to the maximum angle or fully closed, the second limit post will first contact and adsorb the second magnetic block, so that the subsequent second indicator plate moves with the second limit post. When the second magnetic block in contact with the second limit post contacts the limit frame, the disc plate cannot continue to rotate and the valve is completely closed. The cooperation between the second limit post and the limit frame ensures that the disc plate cannot continue to rotate after the valve is fully opened or closed. The full closure of the valve is determined by the scale on the second indicator plate to avoid the second limit post being close to the limit frame but not contacting, thereby ensuring the accuracy of the full closure or opening of the valve.

[0018] 2. Before using the valve, fully open the valve, then drive the movable frame to move by adjusting the screw so that the movable frame contacts the connecting plate, and then fully close the valve. Repeat the above steps until another set of movable frames contacts the connecting plate at the other end of the rack. When the valve is subsequently opened, the movement of the rack can be limited by the cooperation of the movable frame and the connecting plate to avoid the disc plate from rotating at an excess angle, thereby further ensuring the accuracy of the valve being fully opened or closed. During subsequent use, if the second limit column does not fully contact the limit frame after the connecting plate contacts the movable frame, it means that the movement of the rack cannot be fully converted into the rotation of the valve stem, and the gear, rack, worm wheel, and worm are worn, thereby realizing the detection of the wear of the transmission workpiece. After that, the valve is fully closed and opened again and the position of the movable frame is adjusted again. It can detect and discover the wear of the equipment in time and can re-limit the stroke of the transmission equipment according to the detection results, thereby further ensuring the accuracy of the valve being fully opened or closed.

[0019] 3. When opening or closing the valve, gas enters the connecting tube, and then the gas pushes the second piston plate upward to move. The second piston plate moves upward to further compress the elastic member and drive the first friction plate to separate from the second friction plate. At this time, the first friction plate no longer restricts the rotation of the worm gear. After the valve is opened, the external gas supply equipment stops delivering gas. At the same time, the first friction plate contacts the second friction plate to restrict the rotation of the worm gear. When closing the valve, the first branch pipe and the third branch pipe are operated in reverse to complete the closing of the valve. When closing and opening the valve, the first friction plate and the second friction plate cooperate to restrict the worm gear in real time to ensure that the disc plate cannot continue to rotate after rotating to the set angle, avoiding slight angle deviation of the disc plate caused by wear of internal components, and further improving the accuracy of valve opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2It is a schematic diagram of the structure inside the installation box of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the cover plate in the present invention.

[0023] Figure 4 for Figure 1 A magnified schematic diagram of the A1 region in the middle.

[0024] Figure 5 for Figure 2 A magnified schematic diagram of the A2 region in the middle.

[0025] Figure 6 for Figure 2 A magnified schematic diagram of the A3 region in the middle.

[0026] Figure 7 It is the front view of the piston cylinder in the present invention.

[0027] Figure 8 It is a schematic diagram of the structure of the connecting tube in the present invention.

[0028] In the attached drawings: 1, valve body; 2, disc plate; 3, installation box; 4, cover plate; 5, valve stem; 6, worm gear; 7, worm; 8, gear; 9, rack; 10, connecting rod; 11, support rod; 12, connecting plate; 13, first piston plate; 14, piston cylinder; 15, moving frame; 16, adjusting screw; 17, card slot; 18, first indicator plate; 19, first magnetic block; 20, first limit column; 21, top plate; 22. Second limiting column; 23. Limiting cylinder; 24. Limiting frame; 25. Second indicating plate; 26. Second magnetic block; 27. Mounting plate; 28. Connecting cylinder; 29. ​​Partition plate; 30. Second piston plate; 31. Vertical rod; 32. First friction plate; 33. Elastic member; 34. First branch pipe; 35. Second branch pipe; 36. Third branch pipe; 37. Fourth branch pipe; 38. Second friction plate; 39. Power assembly. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0031] like Figure 1-Figure 7As shown, an automatic opening and closing metal sealing butterfly valve position indicating device provided by the present invention comprises a valve body 1, a mounting box 3 is fixedly mounted on the valve body 1, a cover plate 4 is arranged on the mounting box 3, a disc plate 2 is rotatably mounted in the valve body 1 through a valve stem 5, the valve stem 5 extends into the mounting box 3 and a worm gear 6 is fixedly mounted on the upper end of the valve stem 5, the worm gear 6 is meshed with a worm 7 rotatably mounted in the mounting box 3, and a power assembly 39 for driving the worm 7 to rotate is arranged in the mounting box 3;

[0032] A top plate 21 is rotatably mounted on the cover plate 4, and the top plate 21 is coaxially arranged with the worm gear 6. A limiting cylinder 23 is fixedly mounted on the surface of the top plate 21 close to the worm gear 6, and a first limiting column 20 extending into the limiting cylinder 23 is fixedly mounted on the worm gear 6. A second limiting column 22 is fixedly mounted on the surface of the top plate 21 away from the worm gear 6, and two groups of limiting frames 24 used in conjunction with the second limiting columns 22 are fixedly mounted on the cover plate 4, and the two groups of limiting frames 24 are spaced ninety degrees apart and the second limiting columns 22 move between zero and ninety degrees, and a second indicating plate 25 is slidably mounted on the horizontal section of the limiting frame 24, the second indicating plate 25 passes through the limiting frame 24, and second magnetic blocks 26 are fixedly mounted on both ends of the second indicating plate 25, and the second magnetic block 26 is used in conjunction with the second limiting column 22 and the second limiting column 22 is made of magnetic material.

[0033] In actual application of this embodiment, the valve body 1 is connected to the pipeline through a flange. When the valve needs to be opened, the power assembly 39 drives the worm 7 to rotate, and the worm 7 drives the valve stem 5 and the disc plate 2 to rotate through the meshing worm gear 6 to complete the opening of the valve. When the worm gear 6 rotates, the top plate 21 is driven to rotate synchronously through the first limiting column 20 and the limiting cylinder 23, and the top plate 21 drives the second limiting column 22 to rotate synchronously. The rotation angle of the disc plate 2 is observed by the second limiting column 22 and the scale on the cover plate 4, so as to reflect the opening degree of the valve position. When the valve is opened, the second magnetic block 26 is adsorbed on the second limiting column 22, so that the second limiting column 22 rotates and drives the second indicator plate 25 to move. When the second magnetic block 26 at the other end of the second indicator plate 25 contacts the limiting frame 24, the second limiting column 22 is separated from the second magnetic block 26.

[0034] When the disc plate 2 needs to be rotated to the maximum angle or fully closed, the second limit post 22 will first contact and adsorb the second magnetic block 26, so that the subsequent second indicator plate 25 follows the second limit post 22 to move. When the second magnetic block 26 in contact with the second limit post 22 contacts the limit frame 24, the disc plate 2 cannot continue to rotate and the valve is completely closed. The second limit post 22 cooperates with the limit frame 24 to ensure that the disc plate 2 cannot continue to rotate after the valve is fully opened or closed. The scale on the second indicator plate 25 is used to determine whether the valve is fully closed, so as to avoid the second limit post 22 being close to the limit frame 24 but not contacting it, thereby ensuring the accuracy of the valve being fully closed or opened.

[0035] like Figure 1-Figure 7As shown, an automatic opening and closing metal-sealed butterfly valve position indicating device provided by the present invention, the power component 39 includes a rack 9 arranged in the installation box 3, two groups of racks 9 are provided and located at both ends of the worm 7, the rack 9 is meshed with a gear 8 fixedly installed at the end of the worm 7, connecting rods 10 are fixedly installed at both ends of the rack 9, a first piston plate 13 is fixedly installed at one end of the connecting rod 10 away from the rack 9, the first piston plate 13 is slidably connected to a piston cylinder 14 fixedly installed in the installation box 3, and the end of the piston cylinder 14 away from the rack 9 is connected to an external air supply device.

[0036] Specifically, connecting plates 12 are fixedly installed at both ends of the rack 9 , supporting rods 11 distributed along the length direction of the rack 9 are fixedly installed in the installation box 3 , and the connecting plates 12 are slidably installed on the supporting rods 11 .

[0037] In actual application of this embodiment, the external air supply equipment delivers air to the piston cylinder 14 at one end of the installation box 3, and at the same time extracts the air in the piston cylinder 14 at the other end. The air entering the piston cylinder 14 drives the rack 9 to move through the first piston plate 13 and the connecting rod 10. When reverse adjustment is required, the reverse movement of the rack 9 can be achieved by changing the flow direction of the air in the piston cylinders 14 at both ends, thereby realizing the reverse opening or closing of the valve.

[0038] like Figure 1 , Figure 2 , Figure 6 As shown, an automatically opened and closed metal-sealed butterfly valve position indicating device provided by the present invention, a U-shaped movable frame 15 is slidably installed on both sides of the installation box 3, an adjusting screw 16 for driving the movable frame 15 to move is rotatably installed on the side of the installation box 3, and one end of the movable frame 15 located in the installation box 3 is used in conjunction with the connecting plate 12.

[0039] Specifically, a first indicator plate 18 is slidably installed in the parallel section of the movable frame 15, and both ends of the first indicator plate 18 pass through the movable frame 15. A card slot 17 is opened at the end of the movable frame 15 located in the installation box 3, and a first magnetic block 19 is fixedly installed at one end of the first indicator plate 18 located in the card slot 17. The first magnetic block 19 is used in conjunction with the connecting plate 12, and the connecting plate 12 is made of magnetic material.

[0040] In actual application of this embodiment, before the valve is used, the valve is fully opened, and then the movable frame 15 is driven to move by adjusting the screw 16 so that the movable frame 15 contacts the connecting plate 12, and then the valve is fully closed, and the above steps are repeated so that another set of movable frames 15 contacts the connecting plate 12 at the other end of the rack 9. When the valve is subsequently opened, the movable frame 15 cooperates with the connecting plate 12 to limit the movement of the rack 9, thereby preventing the disc plate 2 from rotating at an excessive angle, and further ensuring the accuracy of the valve being fully opened or closed;

[0041] When the connecting plate 12 contacts the moving frame 15, the first magnetic block 19 is attracted to the connecting plate 12, and the first indicator plate 18 is pushed outward. The scale on the extended part of the first indicator plate 18 can detect whether the connecting plate 12 moves to the set position and completely contacts the moving frame 15. When the connecting plate 12 leaves the moving frame 15, the first indicator plate 18 is reset by the first magnetic block 19. After that, when the first indicator plate 18 cannot move, the connecting plate 12 is separated from the first magnetic block 19.

[0042] During subsequent use, when the second limit column 22 is not completely in contact with the limit frame 24 after the connecting plate 12 contacts the movable frame 15, it means that the movement of the rack 9 cannot be completely converted into the rotation of the valve stem 5, and the gear 8, rack 9, worm wheel 6, and worm 7 are worn, thereby realizing the detection of transmission workpiece wear. After that, the valve is fully closed and opened again and the position of the movable frame 15 is adjusted again. It can detect and discover the equipment wear in time and can re-limit the stroke of the transmission equipment according to the detection results, thereby further ensuring the accuracy of the full opening or closing of the valve.

[0043] like Figure 2-Figure 8 As shown, an automatic opening and closing metal sealing butterfly valve position indicating device provided by the present invention, a mounting plate 27 is fixedly installed in the mounting box 3, a connecting cylinder 28 is fixedly installed on the mounting plate 27, a partition 29 is fixedly installed in the connecting cylinder 28, two groups of second piston plates 30 located on both sides of the partition 29 are slidably installed in the connecting cylinder 28, an elastic member 33 is fixedly installed on the second piston plate 30, one end of the elastic member 33 away from the second piston plate 30 is fixedly connected to the mounting plate 27, and two areas in the connecting cylinder 28 are correspondingly connected to the piston cylinders 14 at both ends of the mounting box 3.

[0044] Specifically, a vertical rod 31 is fixedly mounted on the second piston plate 30. The vertical rod 31 extends in a direction away from the mounting plate 27 and passes through the connecting tube 28. A first friction plate 32 is fixedly mounted on one end of the vertical rod 31 away from the second piston plate 30. The first friction plate 32 is used in conjunction with a second friction plate 38 fixedly mounted on the worm gear 6.

[0045] Specifically, the connecting tube 28 is respectively connected to a first branch pipe 34, a second branch pipe 35, a third branch pipe 36 and a fourth branch pipe 37. The first branch pipe 34 and the third branch pipe 36 are respectively connected to an area inside the connecting tube 28. The first branch pipe 34 and the third branch pipe 36 are connected to an external air supply device at one end away from the connecting tube 28. The second branch pipe 35 and the fourth branch pipe 37 are respectively connected to an area inside the connecting tube 28. Under normal conditions, the second piston plate 30 blocks the connection between the second branch pipe 35, the fourth branch pipe 37 and the connecting tube 28.

[0046] In actual application of this embodiment, when the valve is opened, gas enters the connecting cylinder 28 from the first branch pipe 34, and then the gas pushes the second piston plate 30 upward to move. The second piston plate 30 moves upward to further compress the elastic member 33 and drive the first friction plate 32 to separate from the second friction plate 38. At this time, the first friction plate 32 no longer restricts the rotation of the worm gear 6. After the second piston plate 30 moves upward by a set distance, air can enter the piston cylinder 14 through the second branch pipe 35. At the same time, external equipment extracts air in the piston cylinder 14 at the other end through the third branch pipe 36 and the fourth branch pipe 37, and then the rack 9 can move linearly driven by the air. After the valve is opened, the external air supply equipment stops. When the gas is stopped from being transported, the second piston plate 30 is reset under the action of the elastic member 33 to close the connection between the second branch pipe 35, the fourth branch pipe 37 and the connecting tube 28. At this time, the rack 9 can be fixed, and the first friction plate 32 is in contact with the second friction plate 38 to limit the rotation of the worm gear 6. When closing the valve, the first branch pipe 34 and the third branch pipe 36 are operated in reverse to complete the closing of the valve. When closing and opening the valve, the first friction plate 32 and the second friction plate 38 cooperate to limit the worm gear 6 in real time to ensure that the disc plate 2 cannot continue to rotate after rotating to the set angle, thereby avoiding a slight angle deviation of the disc plate 2 caused by wear of the internal components, and further improving the accuracy of the valve opening and closing.

[0047] In an embodiment of the present invention, the elastic member 33 is a spring, and can also be other elastic members such as an elastic ball, and the spring applies a thrust to the first friction plate 32 .

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A valve position indicating device for a metal-sealed butterfly valve with automatic opening and closing, comprising a valve body (1), characterized in that: The valve body (1) is fixedly mounted with an installation box (3), the installation box (3) is provided with a cover plate (4), a disc plate (2) is rotatably mounted in the valve body (1) via a valve stem (5), the valve stem (5) extends into the installation box (3) and a worm gear (6) is fixedly mounted on the upper end of the valve stem (5), the worm gear (6) is meshed with a worm (7) rotatably mounted in the installation box (3), and a power assembly (39) for driving the worm (7) to rotate is provided in the installation box (3); A top plate (21) is rotatably mounted on the cover plate (4), the top plate (21) and the worm gear (6) are coaxially arranged, a limiting cylinder (23) is fixedly mounted on the surface of the top plate (21) close to the worm gear (6), a first limiting column (20) extending into the limiting cylinder (23) is fixedly mounted on the worm gear (6), a second limiting column (22) is fixedly mounted on the surface of the top plate (21) away from the worm gear (6), and two groups of limiting frames (24) used in conjunction with the second limiting columns (22) are fixedly mounted on the cover plate (4).

2. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 1 is characterized in that: The two groups of limiting frames (24) are spaced ninety degrees apart and the second limiting column (22) moves between zero and ninety degrees.

3. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 1 is characterized in that: A second indicating plate (25) is slidably mounted on the horizontal section of the limiting frame (24), the second indicating plate (25) passes through the limiting frame (24) and second magnetic blocks (26) are fixedly mounted on both ends of the second indicating plate (25), the second magnetic blocks (26) are used in conjunction with the second limiting column (22) and the second limiting column (22) is made of magnetic material.

4. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 1 is characterized in that: The power assembly (39) comprises a rack (9) arranged in an installation box (3), wherein two groups of racks (9) are arranged and are located at both ends of the worm (7), the racks (9) are meshed with a gear (8) fixedly installed at the end of the worm (7), connecting rods (10) are fixedly installed at both ends of the racks (9), a first piston plate (13) is fixedly installed at one end of the connecting rod (10) away from the racks (9), the first piston plate (13) is slidably connected to a piston cylinder (14) fixedly installed in the installation box (3), and one end of the piston cylinder (14) away from the racks (9) is connected to an external air supply device.

5. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 4 is characterized in that: Connecting plates (12) are fixedly installed at both ends of the rack (9), supporting rods (11) distributed along the length direction of the rack (9) are fixedly installed in the installation box (3), and the connecting plates (12) are slidably installed on the supporting rods (11).

6. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 5, characterized in that: A U-shaped moving frame (15) is slidably mounted on both sides of the installation box (3); an adjusting screw (16) for driving the moving frame (15) to move is rotatably mounted on the side of the installation box (3); and one end of the moving frame (15) located in the installation box (3) cooperates with the connecting plate (12) for use.

7. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 6, characterized in that: A first indicator plate (18) is slidably mounted in the parallel section of the movable frame (15), both ends of the first indicator plate (18) penetrate the movable frame (15), a card slot (17) is provided at the end of the movable frame (15) located in the installation box (3), a first magnetic block (19) is fixedly mounted at one end of the first indicator plate (18) located in the card slot (17), the first magnetic block (19) is used in conjunction with the connecting plate (12), and the connecting plate (12) is made of magnetic material.

8. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 1 is characterized in that: A mounting plate (27) is fixedly installed in the mounting box (3), a connecting cylinder (28) is fixedly installed on the mounting plate (27), a partition (29) is fixedly installed in the connecting cylinder (28), two groups of second piston plates (30) located on both sides of the partition (29) are slidably installed in the connecting cylinder (28), an elastic member (33) is fixedly installed on the second piston plate (30), one end of the elastic member (33) away from the second piston plate (30) is fixedly connected to the mounting plate (27), and two areas in the connecting cylinder (28) are correspondingly connected to the piston cylinders (14) at both ends of the mounting box (3).

9. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 8, characterized in that: A vertical rod (31) is fixedly mounted on the second piston plate (30). The vertical rod (31) extends in a direction away from the mounting plate (27) and passes through the connecting tube (28). A first friction plate (32) is fixedly mounted on one end of the vertical rod (31) away from the second piston plate (30). The first friction plate (32) is used in conjunction with a second friction plate (38) fixedly mounted on the worm gear (6).

10. The valve position indicating device for an automatically opened and closed metal-sealed butterfly valve according to claim 9, characterized in that: The connecting tube (28) is connected to a first branch pipe (34), a second branch pipe (35), a third branch pipe (36) and a fourth branch pipe (37) respectively. The first branch pipe (34) and the third branch pipe (36) are respectively connected to an area in the connecting tube (28). One end of the first branch pipe (34) and the third branch pipe (36) away from the connecting tube (28) is connected to an external air supply device. The second branch pipe (35) and the fourth branch pipe (37) are respectively connected to an area in the connecting tube (28). In a normal state, the second piston plate (30) blocks the connection between the second branch pipe (35) and the fourth branch pipe (37) and the connecting tube (28).

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