An automatic opening and closing metal-sealed butterfly valve position indicating device

Abstract

The present invention belongs to the technical field of valves and provides a valve position indicating device for a metal-sealed butterfly valve with automatic opening and closing, including a valve body. An installation box is fixedly installed on the valve body, and a cover plate is arranged on the installation box. A disc plate is rotatably installed in the valve body through a valve rod. The valve rod extends into the installation box, and a worm gear is fixedly installed at the upper end of the valve rod. The worm gear meshes with a worm rotatably installed in the installation box. A power assembly for driving the worm to rotate is arranged in the installation box; a top plate is rotatably installed on the cover plate. Compared with the prior art, the beneficial effects of the present invention are as follows: The rotation angle of the disc plate is observed by the cooperation of the second limit post and the scale on the cover plate, so as to reflect the opening degree of the valve position of the valve. The cooperation of 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, ensuring the accuracy of the full closing or opening of the valve.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and in particular relates to a valve position indicating device for a metal-sealed butterfly valve with automatic opening and closing. Background Art

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

[0003] When the butterfly valve is in use, the opening size of the valve will affect the flow rate of the internal medium. Therefore, it is necessary to specifically know the valve position of the valve. Most of the existing butterfly valves are provided 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, when the valve needs to be completely and accurately closed or opened, the valve stem cannot be restricted, and it is not accurate when manually observing the pointer, resulting in the valve not being able to be completely opened or closed, reducing the accuracy of 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 with automatic opening and closing, aiming to solve the technical problem that the valve stem cannot be restricted when the valve is closed or opened in the prior art, reducing the accuracy of valve position indication.

[0005] The present invention is realized as follows: A valve position indicating device for a metal-sealed butterfly valve with automatic opening and closing includes a valve body. An installation box is fixedly installed on the valve body. A cover plate is arranged on the installation box. A disc plate is rotatably installed in the valve body through a valve stem. The valve stem extends into the installation box, and a worm gear is fixedly installed at the upper end of the valve stem. The worm gear meshes with a worm that is rotatably installed in the installation box. A power component for driving the worm to rotate is arranged in the installation box;

[0006] A top plate is rotatably installed on the cover plate. The top plate is coaxially arranged with the worm gear. A limiting cylinder is fixedly installed on the surface of the top plate close to the worm gear. A first limiting column extending into the limiting cylinder is fixedly installed on the worm gear. A second limiting column is fixedly installed on the surface of the top plate away from the worm gear. Two groups of limiting frames for cooperating with the second limiting column are fixedly installed on the cover plate.

[0007] Further technical solution: The two groups of limiting frames are spaced 90 degrees apart, and the second limiting column moves between 0 and 90 degrees.

[0008] Further technical solution: A second indicating plate is slidably installed on the horizontal section of the limiting frame. The second indicating plate penetrates through the limiting frame, and second magnetic blocks are fixedly installed at both ends of the second indicating plate. The second magnetic blocks cooperate with the second limiting column, and the second limiting column is made of a magnetic material.

[0009] Further technical solution: The power assembly includes racks disposed in the installation box. There are two groups of racks located at both ends of the worm. The racks are meshed with gears fixedly installed at the ends of the worm. Connecting rods are fixedly installed at both ends of the racks. One end of the connecting rod away from the rack is fixedly installed with a first piston plate. The first piston plate is slidably connected to a piston cylinder fixedly installed in the installation box. The 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 racks. Struts distributed along the length direction of the racks are fixedly installed in the installation box. The connecting plates are slidably installed on the struts.

[0011] Further technical solution: U-shaped moving frames are slidably installed on both sides of the installation box. Adjusting screws for driving the moving frames to move are rotatably installed on the side surface of the installation box. One end of the moving frame located inside the installation box is used in cooperation with the connecting plate.

[0012] Further technical solution: A first indicating plate is slidably installed in the parallel section of the moving frame. Both ends of the first indicating plate penetrate through the moving frame. A slot is provided at the end of the moving frame located inside the installation box. A first magnetic block is fixedly installed at one end of the first indicating plate located in the slot. The first magnetic block is used in cooperation with the connecting plate and the connecting plate is made of a magnetic material.

[0013] Further technical solution: A mounting plate is fixedly installed in the installation box. A connecting cylinder is fixedly installed on the mounting plate. A partition is fixedly installed in the connecting cylinder. Two second piston plates located on both sides of the partition are slidably installed in the connecting cylinder. Elastic members are fixedly installed on the second piston plates. One end of the elastic member away from the second piston plate is fixedly connected to the mounting plate. The two regions in the connecting cylinder are correspondingly connected to the piston cylinders at both ends inside the installation box.

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

[0015] Further technical solution: A first branch pipe, a second branch pipe, a third branch pipe and a fourth branch pipe are respectively communicated with the connecting cylinder. The first branch pipe and the third branch pipe are respectively connected to one region in the connecting cylinder. The ends of the first branch pipe and the third branch pipe away from the connecting cylinder are connected to an external air supply device. The second branch pipe and the fourth branch pipe are respectively connected to one region in the connecting cylinder. Under normal conditions, the second piston plate blocks the connection between the second branch pipe and the fourth branch pipe and the connecting cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. When the worm gear rotates, it drives the top plate to rotate synchronously through the first limit post and the limit cylinder. The top plate drives the second limit post to rotate synchronously. By observing the rotation angle of the disc through the cooperation between the second limit post and the scale on the cover plate, the opening degree of the valve position of the valve can be reflected. When the disc needs to rotate to the maximum angle or be completely closed, the second limit post will first contact and adsorb the second magnet, causing the subsequent second indicator plate to move with the second limit post. When the second magnet in contact with the second limit post contacts the limit frame, the disc cannot continue to rotate and the valve is completely closed. By cooperating the second limit post with the limit frame, it is ensured that the disc cannot continue to rotate after the valve is completely opened or closed. The complete closure of the valve is determined by the scale on the second indicator plate, avoiding the situation where the second limit post is close to the limit frame but not in contact, and ensuring the accuracy of the complete closure or opening of the valve.

[0018] 2. Before using the valve, fully open the valve. Then, drive the moving frame to move through the adjusting screw rod so that the moving frame contacts the connecting plate. After that, fully close the valve. Repeating the above steps makes another set of moving frames contact the connecting plate at the other end of the rack. When the valve is opened subsequently, the movement of the rack can be restricted through the cooperation between the moving frame and the connecting plate, avoiding the disc rotating an excessive angle and further ensuring the accuracy of the complete opening or closing of the valve. During subsequent use, when the second limit post does not fully contact the limit frame after the connecting plate contacts the moving frame, it indicates that the movement of the rack cannot be completely converted into the rotation of the valve stem, that is, the gears, rack, worm gear, and worm are worn. The detection of the wear of the transmission components is realized. Then, fully close and open the valve again and adjust the position of the moving frame again, which 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 result, further ensuring the accuracy of the complete opening or closing of the valve.

[0019] 3. When opening or closing the valve, gas enters the connecting cylinder. Then, the gas pushes the second piston plate to move upward. The upward movement of the second piston plate further compresses the elastic member and drives 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 opening is completed, the external gas supply equipment stops delivering gas, and 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, reverse operations on the first branch pipe and the third branch pipe can complete the closing of the valve. When opening and closing the valve, the rotation of the worm gear is restricted in real time through the cooperation between the first friction plate and the second friction plate, ensuring that the disc cannot continue to rotate after rotating to the set angle and avoiding the weak angular deviation of the disc caused by the wear of the internal components, further improving the accuracy when opening and closing the valve. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2Schematic diagram of the internal structure of the installation box in the present invention.

[0022] Figure 3 Schematic diagram of the structure of the cover plate in the present invention.

[0023] Figure 4 Is Figure 1 Enlarged schematic diagram of area A1 in

[0024] Figure 5 Is Figure 2 Enlarged schematic diagram of area A2 in

[0025] Figure 6 Is Figure 2 Enlarged schematic diagram of area A3 in

[0026] Figure 7 Front view of the piston cylinder in the present invention.

[0027] Figure 8 Schematic diagram of the structure of the connection cylinder in the present invention.

[0028] In the drawings: 1, valve body; 2, disc plate; 3, installation box; 4, cover plate; 5, valve rod; 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 magnet; 20, first limit post; 21, top plate; 22, second limit post; 23, limit cylinder; 24, limit frame; 25, second indicator plate; 26, second magnet; 27, mounting plate; 28, connection 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 implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to 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 used to limit the present invention.

[0030] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0031] As Figures 1-7As shown in the figure, a valve position indicating device for an automatically opening and closing metal-sealed butterfly valve provided by the present invention includes a valve body 1, an installation box 3 is fixedly installed on the valve body 1, a cover plate 4 is arranged on the installation box 3, a disc plate 2 is rotatably installed in the valve body 1 through a valve stem 5, the valve stem 5 extends into the installation box 3 and a worm gear 6 is fixedly installed at the upper end of the valve stem 5, the worm gear 6 meshes with a worm 7 rotatably installed in the installation box 3, and a power assembly 39 for driving the worm 7 to rotate is arranged in the installation box 3;

[0032] A top plate 21 is rotatably installed on the cover plate 4, the top plate 21 is arranged coaxially with the worm gear 6, a limiting cylinder 23 is fixedly installed on the surface of the top plate 21 close to the worm gear 6, a first limiting post 20 extending into the limiting cylinder 23 is fixedly installed on the worm gear 6, a second limiting post 22 is fixedly installed on the surface of the top plate 21 away from the worm gear 6, and two groups of limiting frames 24 for cooperating with the second limiting post 22 are fixedly installed on the cover plate 4. The two groups of limiting frames 24 are spaced 90 degrees and the second limiting post 22 moves between 0 and 90 degrees. A second indicating plate 25 is slidably installed on the horizontal section of the limiting frame 24. The second indicating plate 25 penetrates through the limiting frame 24 and second magnetic blocks 26 are fixedly installed at both ends of the second indicating plate 25. The second magnetic blocks 26 cooperate with the second limiting post 22 and the second limiting post 22 is made of a 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. 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, it drives the top plate 21 to rotate synchronously through the first limiting post 20 and the limiting cylinder 23. The top plate 21 drives the second limiting post 22 to rotate synchronously. The rotation angle of the disc plate 2 is observed by the cooperation of the second limiting post 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, since the second magnetic block 26 adsorbs to the second limiting post 22, the second indicating plate 25 will move when the second limiting post 22 rotates. When the second magnetic block 26 at the other end of the second indicating plate 25 contacts the limiting frame 24, the second limiting post 22 and the second magnetic block 26 are separated;

[0034] When the disc plate 2 needs to rotate to the maximum angle or be completely closed, the second limiting post 22 will first contact and adsorb to the second magnetic block 26, so that the subsequent second indicating plate 25 follows the second limiting post 22 to move. When the second magnetic block 26 in contact with the second limiting post 22 contacts the limiting frame 24, the disc plate 2 cannot continue to rotate and the valve is completely closed. The cooperation of the second limiting post 22 and the limiting frame 24 ensures that the disc plate 2 cannot continue to rotate after the valve is completely opened or closed. The complete closing of the valve is determined by the scale on the second indicating plate 25, avoiding the situation that the second limiting post 22 is close to the limiting frame 24 but not in contact, and ensuring the accuracy of the complete closing or opening of the valve.

[0035] Such as Figures 1-7As shown in the figure, a valve position indicating device for an automatically opening and closing metal-sealed butterfly valve provided by the present invention. The power assembly 39 includes a rack 9 disposed in the installation box 3. There are two groups of racks 9 located at both ends of the worm 7. The rack 9 meshes with a gear 8 fixedly installed at the end of the worm 7. Both ends of the rack 9 are fixedly installed with connecting rods 10. One end of the connecting rod 10 away from the rack 9 is fixedly installed with a first piston plate 13. The first piston plate 13 is slidably connected to a piston cylinder 14 fixedly installed in the installation box 3. One end of the piston cylinder 14 away from the rack 9 is connected to an external air supply device.

[0036] Specifically, both ends of the rack 9 are fixedly installed with connecting plates 12. In the installation box 3, there are fixedly installed support rods 11 distributed along the length direction of the rack 9. The connecting plates 12 are slidably installed on the support rods 11.

[0037] In actual application of this embodiment, the external air supply device conveys air into one end of the piston cylinder 14 in the installation box 3, and at the same time extracts the air in the other end of the piston cylinder 14. 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, changing the flow direction of the air in the two ends of the piston cylinder 14 can achieve the reverse movement of the rack 9, thereby realizing the reverse opening or closing of the valve.

[0038] As Figure 1 、 Figure 2 、 Figure 6 As shown in the figure, a valve position indicating device for an automatically opening and closing metal-sealed butterfly valve provided by the present invention. On both sides of the installation box 3, there are slidably installed U-shaped moving frames 15. On the side of the installation box 3, there is a rotating adjustment screw 16 for driving the moving frame 15 to move. One end of the moving frame 15 located inside the installation box 3 is used in cooperation with the connecting plate 12.

[0039] Specifically, a first indicating plate 18 is slidably installed in the parallel section of the moving frame 15. Both ends of the first indicating plate 18 penetrate through the moving frame 15. At the end of the moving frame 15 located inside the installation box 3, there is a card slot 17. One end of the first indicating plate 18 located in the card slot 17 is fixedly installed with a first magnetic block 19. The first magnetic block 19 is used in cooperation 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. Then, the adjustment screw 16 is used to drive the moving frame 15 to move so that the moving frame 15 contacts the connecting plate 12. Then, the valve is fully closed. Repeating the above steps enables another group of moving frames 15 to contact the connecting plate 12 at the other end of the rack 9. When the valve is opened subsequently, the cooperation between the moving frame 15 and the connecting plate 12 can limit the movement of the rack 9, avoiding the disc 2 from rotating an excessive angle, and further ensuring the accuracy of the full opening or closing of the valve.

[0041] When the connecting plate 12 contacts the moving frame 15, the first magnet 19 adsorbs to the connecting plate 12. At this time, the first indicating plate 18 is pushed outwards. The scale on the protruding part of the first indicating plate 18 can be used to detect whether the connecting plate 12 has moved to the set position and is in full contact with the moving frame 15. When the connecting plate 12 leaves the moving frame 15, it will drive the first indicating plate 18 to reset through the first magnet 19. After the first indicating plate 18 cannot move, the connecting plate 12 separates from the first magnet 19;

[0042] During subsequent use, when the second limiting post 22 does not fully contact the limiting frame 24 after the connecting plate 12 contacts the moving frame 15, it indicates that the movement of the rack 9 cannot be fully converted into the rotation of the valve stem 5, and the gears 8, rack 9, worm gear 6, and worm 7 are worn. The detection of the wear of the transmission workpiece is realized. Then, the valve is fully closed and opened again, and the position of the moving frame 15 is adjusted again. It can detect and discover in time when the equipment is worn and can re-limit the stroke of the transmission equipment according to the detection result, further ensuring the accuracy of the valve being fully opened or closed.

[0043] As Figures 2-8 shown, a valve position indicating device for an automatically opening and closing metal-sealed butterfly valve 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. Two regions in the connecting cylinder 28 are correspondingly connected to the piston cylinders 14 at both ends in the mounting box 3.

[0044] Specifically, a vertical rod 31 is fixedly installed on the second piston plate 30. The vertical rod 31 extends away from the mounting plate 27 and penetrates through the connecting cylinder 28. One end of the vertical rod 31 away from the second piston plate 30 is fixedly installed with a first friction plate 32. The first friction plate 32 is used in cooperation with the second friction plate 38 fixedly installed on the worm gear 6.

[0045] Specifically, a first branch pipe 34, a second branch pipe 35, a third branch pipe 36, and a fourth branch pipe 37 are respectively communicated with the connecting cylinder 28. The first branch pipe 34 and the third branch pipe 36 are respectively connected to one region in the connecting cylinder 28. One ends of the first branch pipe 34 and the third branch pipe 36 away from the connecting cylinder 28 are connected to an external air supply device. The second branch pipe 35 and the fourth branch pipe 37 are respectively connected to one region in the connecting cylinder 28. Under normal conditions, the second piston plate 30 blocks the connection parts of the second branch pipe 35 and the fourth branch pipe 37 with the connecting cylinder 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. Then, the gas pushes the second piston plate 30 upward. The upward movement of the second piston plate 30 further compresses the elastic member 33 and drives 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, an external device extracts the air in the other piston cylinder 14 through the third branch pipe 36 and the fourth branch pipe 37. Then, driven by the air, the rack 9 can perform linear movement. After the valve is opened, the external gas supply device stops delivering gas. Under the action of the elastic member 33, the second piston plate 30 resets to close the connection between the second branch pipe 35, the fourth branch pipe 37 and the connecting cylinder 28. At this time, the rack 9 can be fixed. At the same time, the first friction plate 32 contacts the second friction plate 38 to restrict the rotation of the worm gear 6. When closing the valve, reverse operations on the first branch pipe 34 and the third branch pipe 36 can complete the closing of the valve. When opening and closing the valve, the first friction plate 32 and the second friction plate 38 cooperate to restrict the worm gear 6 in real time, ensuring that the disc 2 cannot continue to rotate after rotating to a set angle, avoiding weak angular deviations of the disc 2 caused by wear of internal components, and further improving the accuracy when opening and closing the valve.

[0047] In an example of the present invention, the elastic member 33 is a spring. Of course, it can also be other elastic components such as elastic balls, and the spring applies a thrust to the first friction plate 32.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0049] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic opening and closing metal-sealed butterfly valve valve position indicating device, including a valve body (1), characterized in that, An installation box (3) is fixedly installed on the valve body (1). A cover plate (4) is arranged on the installation box (3). A disc plate (2) is rotatably installed in the valve body (1) through a valve rod (5). The valve rod (5) extends into the installation box (3), and a worm gear (6) is fixedly installed at the upper end of the valve rod (5). The worm gear (6) meshes with a worm (7) rotatably installed in the installation box (3). A power assembly (39) for driving the worm (7) to rotate is arranged in the installation box (3). A top plate (21) is rotatably installed on the cover plate (4). The top plate (21) is arranged coaxially with the worm gear (6). A limiting cylinder (23) is fixedly installed 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 installed on the worm gear (6). A second limiting column (22) is fixedly installed on the surface of the top plate (21) far from the worm gear (6). Two groups of limiting frames (24) used in cooperation with the second limiting column (22) are fixedly installed on the cover plate (4). An installation plate (27) is fixedly installed in the installation box (3). A connecting cylinder (28) is fixedly installed on the installation plate (27). A partition plate (29) is fixedly installed in the connecting cylinder (28). Two second piston plates (30) located on both sides of the partition plate (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) far from the second piston plate (30) is fixedly connected with the installation plate (27). Two regions in the connecting cylinder (28) are correspondingly connected with piston cylinders (14) at both ends in the installation box (3). A vertical rod (31) is fixedly installed on the second piston plate (30). The vertical rod (31) extends in a direction away from the installation plate (27) and penetrates through the connecting cylinder (28). A first friction plate (32) is fixedly installed at the end of the vertical rod (31) far from the second piston plate (30). The first friction plate (32) is used in cooperation with a second friction plate (38) fixedly installed on the worm gear (6). A first branch pipe (34), a second branch pipe (35), a third branch pipe (36) and a fourth branch pipe (37) are respectively communicated with the connecting cylinder (28). The first branch pipe (34) and the third branch pipe (36) are respectively connected with a region in the connecting cylinder (28). The ends of the first branch pipe (34) and the third branch pipe (36) far from the connecting cylinder (28) are connected with an external air supply device. The second branch pipe (35) and the fourth branch pipe (37) are respectively connected with a region in the connecting cylinder (28). Under normal conditions, the second piston plate (30) blocks the joints of the second branch pipe (35) and the fourth branch pipe (37) with the connecting cylinder (28).

2. The valve position indicating device of a metal-sealed butterfly valve with automatic opening and closing according to claim 1, characterized in that, The two groups of limiting frames (24) are spaced 90 degrees apart, and the second limiting column (22) moves between 0 and 90 degrees.

3. The valve position indicating device of a metal-sealed butterfly valve with automatic opening and closing according to claim 1, characterized in that, A second indicating plate (25) is slidably installed on the horizontal section of the limiting frame (24). The second indicating plate (25) penetrates through the limiting frame (24), and second magnetic blocks (26) are fixedly installed at both ends of the second indicating plate (25). The second magnetic blocks (26) are used in cooperation with the second limiting column (22), and the second limiting column (22) is made of a magnetic material.

4. An automatic opening and closing metal sealed butterfly valve valve position indicating device according to claim 1, characterized in that The power assembly (39) includes a rack (9) disposed in the installation box (3). There are two groups of racks (9) located at both ends of the worm (7). The rack (9) is engaged 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 the 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). The end of the piston cylinder (14) away from the rack (9) is connected to an external air supply device.

5. An automatic opening and closing metal sealed butterfly valve valve position indicating device according to claim 4, characterized in that, Connecting plates (12) are fixedly installed at both ends of the rack (9). Support rods (11) distributed along the length direction of the rack (9) are fixedly installed in the installation box (3). The connecting plates (12) are slidably installed on the support rods (11).

6. The valve position indicating device of a metal-sealed butterfly valve with automatic opening and closing according to claim 5, characterized in that, U-shaped moving frames (15) are slidably installed on both sides of the installation box (3). Adjusting screws (16) for driving the moving frames (15) to move are rotatably installed on the side surface of the installation box (3). The end of the moving frame (15) located inside the installation box (3) is used in cooperation with the connecting plate (12).

7. An automatic opening and closing metal-sealed butterfly valve valve position indicating device according to claim 6, characterized in that, A first indicating plate (18) is slidably installed in the parallel section of the moving frame (15). Both ends of the first indicating plate (18) penetrate through the moving frame (15). A clamping groove (17) is formed at the end of the moving frame (15) located inside the installation box (3). A first magnetic block (19) is fixedly installed at the end of the first indicating plate (18) located in the clamping groove (17). The first magnetic block (19) is used in cooperation with the connecting plate (12), and the connecting plate (12) is made of a magnetic material.

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