A dome valve operating condition monitoring device

Abstract

The application belongs to the technical field of monitoring devices, and discloses a dome valve operation state monitoring device, which comprises a monitoring instrument and a detection mechanism arranged on the monitoring instrument, one side of the monitoring instrument is provided with a sealed tank, a sealing piston is slidably connected in the sealed tank, an air inlet pipe is fixedly connected and communicated on the side wall of the sealed tank, a one-way valve is arranged on the air inlet pipe, an air outlet pipe is fixedly connected and communicated on the side wall of the sealed tank, a one-way valve is arranged on the air outlet pipe, one end of the air outlet pipe away from the sealed tank is connected with an air inlet end of an air inflation sealing pad, a lifting assembly is arranged on the sealed tank, and the lifting assembly is electrically connected with the monitoring instrument. Through the arrangement of the sealed tank, the sealing piston, the air inlet pipe, the air outlet pipe and the lifting assembly, the shrinkage degree of the air inflation sealing pad when the air inflation sealing pad is damaged is reduced, the gap between the air inflation sealing pad and the valve core of the dome valve is reduced, and thus the probability of material flowing from one end of the dome valve to the other end of the dome valve when the material backflows is reduced.

Description

Technical Field

[0001] This utility model relates to the field of monitoring device technology, and in particular to a dome valve operation status monitoring device. Background Technology

[0002] When the dome valve is closed, a certain amount of gas is injected into the gasket until the gasket fits against the valve core of the dome valve to ensure that the dome valve can perform normal sealing work. When the gasket is in the inflated state, its operating status needs to be monitored, such as air tightness. If the monitored pressure drops rapidly, it indicates that the gasket is seriously damaged. In this case, the gasket needs to be replaced. Before replacement, the material needs to be returned.

[0003] Existing dome valve airtightness monitoring devices can only monitor the airtightness of the inflatable sealing gasket, but cannot compensate for the air pressure inside the inflatable sealing gasket. Once the inflatable sealing gasket is severely damaged, its expansion will be significantly reduced, and the gap between the inflatable sealing gasket and the valve core of the dome valve will increase, thereby increasing the probability that material will flow from one end of the dome valve to the other end during material backflow. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a dome valve operation status monitoring device.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a dome valve operation status monitoring device, including a monitor and a detection mechanism disposed on the monitor. The detection mechanism is used to detect the air pressure of the inflatable sealing gasket. A sealing tank is disposed on one side of the monitor. A sealing piston is slidably connected inside the sealing tank. An air inlet pipe is fixed and connected to the side wall of the sealing tank. A one-way valve for controlling air to enter the sealing tank only through the air inlet pipe is disposed on the air inlet pipe. An exhaust pipe is fixed and connected to the side wall of the sealing tank. A one-way valve for controlling air in the sealing tank to be discharged only through the exhaust pipe is disposed on the exhaust pipe. The end of the exhaust pipe away from the sealing tank is connected to the air inlet end of the inflatable sealing gasket. A lifting assembly for driving the sealing piston to rise and fall is disposed on the sealing tank. The lifting assembly is electrically connected to the monitor.

[0006] By adopting the above technical solution, the air pressure of the inflatable sealing gasket is monitored in real time by the testing agency. When the pressure inside the inflatable sealing gasket drops to a certain value, the lifting component drives the sealing piston to rise, venting outside air from the inlet pipe to the inside of the exhaust pipe until the sealing piston rises to the top of the sealing tank. At this time, the lifting component drives the sealing piston to descend to the bottom of the sealing tank. During this process, the air inside the sealing tank is discharged into the inflatable sealing gasket through the exhaust pipe, pressurizing the inflatable sealing gasket, reducing the degree of shrinkage of the inflatable sealing gasket, and reducing the gap between the inflatable sealing gasket and the valve core of the dome valve. This reduces the probability that material will flow from one end of the dome valve to the other end during material backflow.

[0007] Furthermore, the lifting assembly includes a fixed base plate fixed to the bottom of the sealed tank, a mounting top plate fixedly sleeved on the sealed tank, and an annular plate fixed to the top of the sealing piston. The annular plate passes through the top of the sealed tank and is slidably fitted. A rack is fixed inside the annular plate. The lifting assembly also includes a motor fixed to the mounting top plate and a gear fixedly sleeved on the motor and meshing with the rack.

[0008] By adopting the above technical solution, after the motor starts working, it drives the gear to rotate, which causes the rack meshing with the gear, the annular plate connected to the rack, and the sealing piston connected to the annular plate to all rise, thereby supplying air into the sealed tank. Similarly, when the sealing piston rises to the top position of the sealed tank, the motor starts working and drives the gear to rotate in the opposite direction, causing the rack, annular plate, and sealing piston to all fall, thereby venting the air out of the sealed tank and ensuring normal air pressure compensation.

[0009] Furthermore, the detection mechanism includes a detection component, which includes a sealed box fixed to the monitor, a three-way pipe fixed and connected to the bottom of the sealed box, and an air supply pipe fixed and connected to the top of the sealed box. The end of the air supply pipe away from the sealed box is connected to an air source. The side wall of the air supply pipe is fixed and connected to the end of the three-way pipe away from the monitor. A one-way valve is provided at the connection between the air supply pipe and the three-way pipe to ensure that air can only enter the three-way pipe through the air supply pipe. The end of the exhaust pipe away from the sealed container is fixed and connected to the side wall of the three-way pipe. The end of the three-way pipe near the monitor is fixed and connected to the air supply pipe of the inflatable sealing gasket. The detection component also includes a leak-proof piston slidably disposed in the sealed box, a conductive block fixed to the bottom of the leak-proof piston, and two sets of conductive strips fixed in the sealed box and located below the conductive block. Both sets of conductive strips are electrically connected to the motor and the monitor. The detection mechanism also includes a support component for resetting the leak-proof piston.

[0010] By adopting the above technical solution, during normal monitoring operation, a portion of the air enters the sealed container through the air supply pipe, while the other portion enters the three-way pipe through a one-way valve connected to the air supply pipe. The air then enters the inflatable sealing gasket through the horizontal section of the three-way pipe for normal inflation, and also enters the sealed container through the vertical section of the three-way pipe. At this time, the inflatable sealing gasket is undamaged, and the air pressure in the air supply pipe and the three-way pipe is equal, causing the leak-proof piston to receive equal external force and remain stationary. When the inflatable sealing gasket is damaged, the one-way valve at the connection between the air supply pipe and the three-way pipe ensures that air can only enter the three-way pipe through the air supply pipe. In this case, the air pressure in the three-way pipe is lower than the pressure in the air supply pipe, causing the leak-proof piston to descend until the conductive block contacts the two conductive strips. At this point, both the monitor and the leak-proof piston are powered on. The monitor controls the leak-proof piston to operate and supplies air to the inflatable sealing gasket, thereby achieving pressure compensation for the inflatable sealing gasket.

[0011] Furthermore, the support assembly includes a partition plate fixed inside the sealed container and located below the leak-proof piston, and a sliding rod fixed to the bottom of the leak-proof piston. The sliding rod passes through and is fixed to the conductive block, and passes through the partition plate and is slidably engaged. Two leak-proof pistons are provided and are symmetrically arranged about the partition plate. The support assembly also includes a support spring sleeved on the sliding rod, and the support spring is fixed between the lower leak-proof piston and the partition plate.

[0012] By adopting the above technical solution, the slide bar increases the stability of the leak-proof piston during its descent. When the pressure inside the gas pipeline is equal to the pressure inside the three-way pipe, the support spring provides support to the leak-proof piston, thereby improving the stability of the leak-proof piston.

[0013] Furthermore, a positioning mechanism is provided on both the leak-proof piston and the sealing box. An installation groove is provided on the side wall of the leak-proof piston. The positioning mechanism includes a positioning component, which includes a positioning spring fixed to the inner wall of the mounting groove near the monitor and in a retracted state, and a positioning block fixed to the end of the positioning spring away from the monitor. The positioning block slides in the mounting groove. A positioning through hole is provided on the side wall of the sealing box for the positioning block to pass through and engage. The positioning mechanism also includes a reset component for resetting the positioning block.

[0014] By adopting the above technical solution, during the process of the anti-leakage piston descending, both the positioning spring and the positioning block will descend with the anti-leakage piston until the positioning block descends to the positioning through hole. At this time, the positioning spring begins to extend and drives the positioning block to move in the direction of the positioning through hole and connect with the positioning through hole. The positioning through hole and the positioning block improve the stability when the conductive block contacts the conductive strip.

[0015] Furthermore, the reset assembly includes an internally threaded tube fixed to the side wall of the sealing box at a position corresponding to the positioning through hole, a threaded rod threadedly connected to the internally threaded tube and inserted into the positioning through hole, and a knob fixed to the end of the threaded rod away from the sealing box.

[0016] By adopting the above technical solution, after the air-filled sealing gasket is replaced, rotating the knob will drive the threaded rod to rotate. Since the knob and the threaded rod are threadedly connected, the threaded rod will drive the knob to move in the direction of the positioning through hole. The threaded rod will squeeze the positioning block to move away from the positioning through hole until the positioning block separates from the positioning through hole. As the anti-leak piston descends, it will stretch the support spring. At this time, the support spring will gradually contract and return to its original position, which will drive the anti-leak piston connected to the support spring, the slide rod connected to the anti-leak piston, and the positioning block connected to the air inlet pipe of the positioning component to rise and return to their original position for subsequent monitoring work.

[0017] Furthermore, multiple anti-slip strips are fixed on the side wall of the knob.

[0018] By adopting the above technical solution and setting the anti-slip strip, the probability of slippage when rotating the knob is reduced.

[0019] In summary, the present invention has the following beneficial effects: In this application, by setting up a sealing tank, a sealing piston, an air inlet pipe, an exhaust pipe and a lifting assembly, the degree of shrinkage when the inflatable sealing gasket is damaged is reduced, and the gap between the inflatable sealing gasket and the valve core of the dome valve is reduced, thereby reducing the probability that the material will flow from one end of the dome valve to the other end of the dome valve during material backflow. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present invention used to highlight the lifting component;

[0022] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the internal structure of the sealing box;

[0023] Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0024] In the diagram: 1. Monitor; 2. Sealed container; 3. Sealing piston; 4. Inlet pipe; 5. Exhaust pipe; 6. Lifting assembly; 61. Fixed base plate; 62. Mounting top plate; 63. Annular plate; 64. Motor; 65. Gear; 7. Detection mechanism; 71. Detection assembly; 711. Sealed box; 712. T-pipe; 713. Gas supply pipe; 714. Leak-proof piston; 715. Conductive block; 716. Conductive strip; 72. Support assembly; 721. Partition plate; 722. Slide rod; 723. Support spring; 8. Mounting groove; 9. Positioning mechanism; 91. Positioning assembly; 911. Positioning spring; 912. Positioning block; 913. Positioning through hole; 92. Reset assembly; 921. Internally threaded pipe; 922. Threaded rod; 923. Knob. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] like Figure 1-4 As shown in the figure, this application discloses a dome valve operation status monitoring device, including a monitor 1, a lifting assembly 6, a detection mechanism 7, and a positioning mechanism 9. A sealed container 2 is provided on one side of the monitor 1, and a sealing piston 3 is slidably connected inside the sealed container 2. An air inlet pipe 4 is fixed and connected to the side wall of the sealed container 2, and a one-way valve is provided on the air inlet pipe 4 to control that air can only enter the sealed container 2 through the air inlet pipe 4. An exhaust pipe 5 is fixed and connected to the side wall of the sealed container 2, and a one-way valve is provided on the exhaust pipe 5 to control that air in the sealed container 2 can only be discharged through the exhaust pipe 5. The end of the exhaust pipe 5 away from the sealed container 2 is connected to the air inlet end of the inflatable sealing gasket.

[0027] A lifting assembly 6 is mounted on the sealed container 2 and is used to drive the sealing piston 3 to rise and fall. The lifting assembly 6 is electrically connected to the monitoring instrument 1 and includes a fixed base plate 61, a mounting top plate 62, an annular plate 63, a motor 64, and a gear 65. The fixed base plate 61 is fixed to the bottom of the sealed container 2, and the mounting top plate 62 is fixedly fitted onto the sealed container 2. The annular plate 63 is fixed to the top of the sealing piston 3, and the annular plate 63 passes through the top of the sealed container 2 and slides in fit. A rack is fixed inside the annular plate 63, the motor 64 is fixed to the mounting top plate 62, and the gear 65 is fixedly fitted onto the motor 64 and meshes with the rack.

[0028] The air pressure of the inflatable sealing gasket is monitored in real time by the detection mechanism 7. When the pressure inside the inflatable sealing gasket drops to a certain value, the motor 64 drives the gear 65 to rotate, which causes the rack meshing with the gear 65, the annular plate 63 connected to the rack, and the sealing piston 3 connected to the annular plate 63 to rise, expelling outside air from the air inlet pipe 4 to the interior of the exhaust pipe 5 until the sealing piston 3 rises to the top of the sealing tank 2. At this time, the motor 64 drives the gear 65 to rotate in the opposite direction, causing the rack, annular plate 63, and sealing piston 3 to fall until the sealing piston 3 moves to the bottom of the sealing tank 2. During this process, the air inside the sealing tank 2 is discharged into the inflatable sealing gasket through the exhaust pipe 5, pressurizing the inflatable sealing gasket, reducing the degree of shrinkage of the inflatable sealing gasket, and reducing the gap between the inflatable sealing gasket and the valve core of the dome valve, thereby reducing the probability of material flowing from one end of the dome valve to the other end during material backflow.

[0029] The detection mechanism 7 is mounted on the monitor 1 and is used to perform air pressure testing on the inflatable sealing gasket. The detection mechanism 7 includes a detection component 71 and a support component 72. The detection component 71 includes a sealing box 711, a three-way pipe 712, an air supply pipe 713, a leak-proof piston 714, a conductive block 715, and a conductive strip 716. The sealing box 711 is fixed to the monitor 1. The three-way pipe 712 is fixed and connected to the bottom of the sealing box 711. The end of the exhaust pipe 5 away from the sealing tank 2 is fixed and connected to the side wall of the three-way pipe 712. The end of the three-way pipe 712 near the monitor 1 is fixed and connected to the air supply pipe of the inflatable sealing gasket. The air supply pipe 713 is fixed and connected to the top of the sealing box 711. The end of the air supply pipe 713 away from the sealing box 711 is connected to the air source. The side wall of the air supply pipe 713 is fixed and connected to the end of the three-way pipe 712 away from the monitor 1. A one-way valve is installed at the connection between the gas supply pipe 713 and the three-way pipe 712 to ensure that air can only enter the three-way pipe 712 through the gas supply pipe 713. A leak-proof piston 714 is slidably mounted inside the sealing box 711, and an installation groove 8 is provided on the side wall of the leak-proof piston 714. A conductive block 715 is fixed to the bottom of the leak-proof piston 714, and a conductive strip 716 is fixed inside the sealing box 711 and located below the conductive block 715. Two sets of conductive strips 716 are provided, and both conductive strips 716 are electrically connected to the motor 64 and the monitoring instrument 1.

[0030] During normal monitoring operation of the monitor 1, a portion of the air enters the sealed container 2 through the air supply pipe 713, while another portion enters the three-way pipe 712 through the one-way valve connected to the air supply pipe 713. Air then enters the inflation sealing gasket via the horizontal section of the three-way pipe 712 for normal inflation, and also enters the sealed container 2 via the vertical section of the three-way pipe 712. At this time, the inflation sealing gasket is undamaged, and the air pressure in the air supply pipe 713 and the three-way pipe 712 is equal, causing the leak-proof piston 714 to receive equal external force and remain stationary. When the inflation sealing... When the gasket is damaged, a one-way valve is installed at the connection between the air supply pipe 713 and the three-way pipe 712 to allow air to enter the three-way pipe 712 only through the air supply pipe 713. At this time, the air pressure in the three-way pipe 712 is less than the pressure in the air supply pipe 713. The leak-proof piston 714 begins to descend until the conductive block 715 contacts the two conductive strips 716. The monitoring instrument 1 and the leak-proof piston 714 are both connected to the power signal. The monitoring instrument 1 controls the leak-proof piston 714 to work and supply air to the inflatable sealing gasket, thereby achieving the purpose of compensating for the pressure of the inflatable sealing gasket.

[0031] The support assembly 72 is used to reset the leak-proof piston 714. The support assembly 72 includes a partition 721, a slide rod 722, and a support spring 723. The partition 721 is fixed inside the sealed container 2 and located below the leak-proof piston 714. The slide rod 722 is fixed to the bottom of the leak-proof piston 714. The slide rod 722 passes through and is fixed to the conductive block 715, and also passes through the partition 721 and slides in contact with it. Two leak-proof pistons 714 are provided and symmetrically arranged about the partition 721. The support spring 723 is sleeved on the slide rod 722 and fixed between the lower leak-proof piston 714 and the partition 721. During the descent of the leak-proof piston 714, the slide rod 722 increases the stability of the leak-proof piston 714 during movement. When the pressure inside the gas supply pipe 713 is equal to the pressure inside the three-way pipe 712, the support spring 723 provides support to the leak-proof piston 714, improving its stability.

[0032] The positioning mechanism 9 is jointly mounted on the leak-proof piston 714 and the sealing box 711. The positioning mechanism 9 includes a positioning component 91 and a reset component 92. The positioning component 91 includes a positioning spring 911 and a positioning block 912. The positioning spring 911 is fixed to the inner wall of the mounting groove 8 near the monitor 1 and is in a retracted state. The positioning block 912 is fixed to the end of the positioning spring 911 away from the monitor 1. The positioning block 912 slides in the mounting groove 8. A positioning through hole 913 is provided through the side wall of the sealing box 711 for the positioning block 912 to pass through and engage. During the descent of the anti-leakage piston 714, both the positioning spring 911 and the positioning block 912 will descend with the anti-leakage piston 714 until the positioning block 912 descends to the positioning through hole 913. At this time, the positioning spring 911 begins to extend and drives the positioning block 912 to move toward the positioning through hole 913 and connect with the positioning through hole 913. The positioning through hole 913 and the positioning block 912 improve the stability when the conductive block 715 contacts the conductive strip 716.

[0033] The reset assembly 92 is used to reset the positioning block 912. The reset assembly 92 includes an internally threaded tube 921, a threaded rod 922, and a knob 923. The internally threaded tube 921 is fixed to the side wall of the sealing box 711 at a position corresponding to the positioning through hole 913. The threaded rod 922 is threadedly connected to the internally threaded tube 921 and is inserted into the positioning through hole 913. The knob 923 is fixed to the end of the threaded rod 922 away from the sealing box 711. After the air-filled sealing gasket is replaced, rotate the knob 923 and drive the threaded rod 922 to rotate. Since the knob 923 is threadedly connected to the threaded rod 922, the threaded rod 922 drives the knob 923 to move in the direction of the positioning through hole 913. The threaded rod 922 will squeeze the positioning block 912 to move away from the positioning through hole 913 until the positioning block 912 separates from the positioning through hole 913. As the anti-leakage piston 714 descends, it will stretch the support spring 723. At this time, the support spring 723 gradually contracts and returns to its original position, which drives the anti-leakage piston 714 connected to the support spring 723, the slide rod 722 connected to the anti-leakage piston 714, and the positioning block 912 connected to the air inlet pipe 4 of the positioning assembly 91 to rise and return to its original position for subsequent monitoring work.

[0034] Multiple anti-slip strips are fixed to the side wall of knob 923. The anti-slip strips reduce the probability of slippage when rotating knob 923.

[0035] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A dome valve operation status monitoring device, comprising a monitoring instrument (1) and a detection mechanism (7) disposed on the monitoring instrument (1), the detection mechanism (7) being used to perform air pressure detection on the inflatable sealing gasket, characterized in that: A sealed container (2) is provided on one side of the monitor (1). A sealing piston (3) is slidably connected inside the sealed container (2). An air inlet pipe (4) is fixed and connected to the side wall of the sealed container (2). A one-way valve is provided on the air inlet pipe (4) to control that air can only enter the sealed container (2) through the air inlet pipe (4). An exhaust pipe (5) is fixed and connected to the side wall of the sealed container (2). A one-way valve is provided on the exhaust pipe (5) to control that air in the sealed container (2) can only be discharged through the exhaust pipe (5). The end of the exhaust pipe (5) away from the sealed container (2) is connected to the air inlet end of the inflatable sealing gasket. A lifting assembly (6) is provided on the sealed container (2) to drive the sealing piston (3) to rise and fall. The lifting assembly (6) is electrically connected to the monitor (1).

2. The dome valve operation status monitoring device according to claim 1, characterized in that: The lifting assembly (6) includes a fixed base plate (61) fixed to the bottom of the sealed tank (2), a mounting top plate (62) fixedly sleeved on the sealed tank (2), and an annular plate (63) fixed to the top of the sealing piston (3). The annular plate (63) passes through the top of the sealed tank (2) and slides in fit. A rack is fixed inside the annular plate (63). The lifting assembly (6) also includes a motor (64) fixed to the mounting top plate (62) and a gear (65) fixedly sleeved on the motor (64) and meshing with the rack.

3. The dome valve operation status monitoring device according to claim 1, characterized in that: The detection mechanism (7) includes a detection component (71), which includes a sealed box (711) fixed to the monitor (1), a three-way pipe (712) fixed and connected to the bottom of the sealed box (711), and an air supply pipe (713) fixed and connected to the top of the sealed box (711). The end of the air supply pipe (713) away from the sealed box (711) is connected to an air source. The side wall of the air supply pipe (713) is fixed and connected to the end of the three-way pipe (712) away from the monitor (1). A one-way valve is provided at the connection between the air supply pipe (713) and the three-way pipe (712) to allow air to enter the three-way pipe (712) only through the air supply pipe (713). The end of the exhaust pipe (5) away from the sealed tank (2) is fixed and connected to the side wall of the three-way pipe (712). The end of the three-way pipe (712) near the monitor (1) is fixed and connected to the air supply pipe of the inflatable sealing gasket. The detection assembly (71) also includes a leak-proof piston (714) slidably disposed in the sealed box (711), a conductive block (715) fixed to the bottom of the leak-proof piston (714), and two sets of conductive strips (716) fixed in the sealed box (711) and located below the conductive block (715). The conductive strips (716) are electrically connected to the motor (64). The detection mechanism (7) also includes a support assembly (72) for resetting the leak-proof piston (714).

4. The dome valve operation status monitoring device according to claim 3, characterized in that: The support assembly (72) includes a partition (721) fixed inside the sealed container (2) and located below the leak-proof piston (714) and a slide rod (722) fixed to the bottom of the leak-proof piston (714). The slide rod (722) passes through the conductive block (715) and is fixed. The slide rod (722) passes through the partition (721) and is slidably engaged. The leak-proof piston (714) is provided with two parts and is symmetrically arranged about the partition (721). The support assembly (72) also includes a support spring (723) sleeved on the slide rod (722). The support spring (723) is fixed between the lower leak-proof piston (714) and the partition (721).

5. The dome valve operating status monitoring device according to claim 4, characterized in that: The leak-proof piston (714) and the sealing box (711) are jointly provided with a positioning mechanism (9). The leak-proof piston (714) has an installation groove (8) on its side wall. The positioning mechanism (9) includes a positioning component (91). The positioning component (91) includes a positioning spring (911) fixed to the inner wall of the mounting groove (8) near the monitor (1) and in a contracted state, and a positioning block (912) fixed to the end of the positioning spring (911) away from the monitor (1). The positioning block (912) slides with the mounting groove (8). The sealing box (711) has a through-hole (913) for the positioning block (912) to pass through and engage. The positioning mechanism (9) also includes a reset component (92) for resetting the positioning block (912).

6. The dome valve operating status monitoring device according to claim 5, characterized in that: The reset assembly (92) includes an internally threaded tube (921) fixed to the side wall of the sealing box (711) at a position corresponding to the positioning through hole (913), a threaded rod (922) threadedly connected to the internally threaded tube (921) and inserted into the positioning through hole (913), and a knob (923) fixed to the end of the threaded rod (922) away from the sealing box (711).

7. The dome valve operation status monitoring device according to claim 6, characterized in that: Multiple anti-slip strips are fixed on the side wall of the knob (923).

Images