Bus type valve and control method thereof

Abstract

The invention discloses a bus type valve and a control method thereof, and relates to the technical field of pneumatic fluid control, the bus type valve comprises a housing, a controller and an actuator, the actuator is located below the housing, the controller is located in the housing, the controller is located above the actuator, a proximity switch is arranged at the position of the controller, and the proximity switch is connected with the actuator. A pneumatic diaphragm valve is arranged below the actuator, a connecting socket is arranged on the side wall of the housing, the connecting socket is electrically connected with the controller and used for being connected with a main station, and the controller can control connection and disconnection of an air channel under the control of the main station and enables the pneumatic diaphragm valve to act. When the pneumatic diaphragm valve acts, the pneumatic diaphragm valve can make contact with or not make contact with the proximity switch, and the proximity switch transmits signals to the controller or does not transmit signals to the controller. The system is simple in structure, simple and convenient in wiring and high in anti-interference capability.

Description

Technical Field

[0001] This invention relates to the field of pneumatic fluid control technology, and in particular to a bus-type valve and its control method. Background Technology

[0002] In industrial production and automation control, valves, as key actuators in fluid transmission systems, directly impact the overall system's operating efficiency and maintenance costs due to the reliability, convenience, and economy of their control methods. Currently, mainstream valves and their associated control solutions on the market generally suffer from numerous technical deficiencies, failing to meet modern industry's demands for simplified construction, reduced costs, and improved stability. Existing valve control methods have significant shortcomings in wiring design: On the one hand, control signal transmission and power supply rely on multiple dedicated cables, and there are strict restrictions on the line topology, resulting in complicated on-site wiring processes and a large amount of cables. This not only increases material costs and construction time, but also makes wiring errors very easy to occur due to the large number of wiring nodes, causing great inconvenience to system debugging. On the other hand, when too many wires are densely arranged in the wiring trough, they are prone to serious signal interference. This interference may cause valve malfunction in high-precision control scenarios, becoming a fatal hidden danger affecting industrial production safety. Furthermore, due to the complexity of the control logic, the initial setup and parameter debugging of related equipment in the existing valve control schemes require professional engineers to complete, making it difficult for ordinary operators to carry out maintenance work independently, which leads to a lag in system operation and maintenance response. At the same time, the mixed layout of multiple signal lines and power lines makes fault diagnosis extremely difficult. Once a line fault or signal abnormality occurs, technicians need to check multiple cables and interfaces one by one, which seriously affects the continuity of production. In addition, some existing solutions use high-speed bus control methods, which impose stringent requirements on electromagnetic interference shielding and grounding. This not only increases the technical difficulty of on-site construction but also limits its adaptability in complex industrial environments (such as areas with strong electromagnetic interference and harsh working conditions). Furthermore, long-distance signal transmission is prone to problems such as signal attenuation and decreased stability, which further restricts its application scope in large-scale industrial scenarios. Summary of the Invention

[0003] The purpose of this invention is to provide a bus-type valve and its control method to solve the problems existing in the prior art, making the structure simple, the wiring convenient, and the anti-interference ability strong.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a bus-type valve, including a housing, a controller, and an actuator. The actuator is located below the housing, and the controller is located inside the housing and above the actuator. A proximity switch is provided at the controller. A pneumatic diaphragm valve is located below the actuator. A connection socket is provided on the side wall of the housing. The connection socket is electrically connected to the controller and is used to connect to a master station. The controller can control the opening and closing of the air circuit under the control of the master station and actuate the pneumatic diaphragm valve. When the pneumatic diaphragm valve actuates, it can contact or not contact the proximity switch, and the proximity switch can transmit a signal to the controller or not transmit a signal.

[0005] Preferably, the controller includes a controller base, a circuit board, a solenoid valve, and a proximity switch. The upper end of the controller base is connected to the lower opening of the housing. The circuit board is installed inside the housing. The solenoid valve is connected to the controller base by screws. The connection socket, the solenoid valve, and the proximity switch are all electrically connected to the circuit board.

[0006] Preferably, the controller base is installed on the lower end of the cover by screws, and a sealing ring is provided between the upper end of the controller base and the lower end of the cover.

[0007] Preferably, the circuit board is mounted on the controller base via a circuit board mounting plate, and the circuit board is positioned near the upper end of the housing.

[0008] Preferably, the proximity switch is pressed onto the proximity switch mounting plate by a nut, and the proximity switch mounting plate is connected to the upper end of the controller base by screws.

[0009] Preferably, the proximity switch mounting plate is provided with an oblong hole, the proximity switch is installed at the oblong hole, and the position of the proximity switch on the oblong hole is adjustable.

[0010] Preferably, the pneumatic diaphragm valve and the lower end of the controller base are connected by a connecting screw. The upper end of the connecting screw is limited to the lower opening of the controller base by a stepped surface, and the upper end face of the connecting screw is provided with a first groove. A first O-ring is embedded in the first groove. The first O-ring is pressed between the upper end face of the connecting screw and the lower end face of the controller base. A pressure plate is also provided below the stepped surface of the connecting screw. The pressure plate is embedded between the stepped surface of the connecting screw and the lower end of the controller base. The lower end of the connecting screw can extend into the pneumatic diaphragm valve, and the lower end face of the head of the connecting screw is provided with a second groove. A second O-ring is embedded in the second groove. The second O-ring is pressed between the lower end face of the head of the connecting screw and the upper end face of the pneumatic diaphragm valve.

[0011] Preferably, the actuator includes a valve stem extension plate, a bushing, and a helical spring; the pneumatic diaphragm valve includes a valve stem, a valve stem base, and a valve core; a through hole is provided in the middle of the connecting screw, the through hole extending through the connecting screw along its length; a washer is installed in the through hole; the bushing is located in an elongated hole on the controller base, and the bushing is positioned above the washer; the upper end of the valve stem can pass through the bushing under the constraint of the washer and connect to the valve stem extension plate located above the bushing; the upper end of the valve stem extension plate... Extending away from the pneumatic diaphragm valve, the valve stem extension plate can move under the action of the valve stem and may or may not be detected by the proximity switch. The lower end of the valve stem is connected to the valve stem base, which is located above the valve core. A helical spring is provided between the lower end face of the washer and the inner bottom face of the connecting screw, and between the lower end face of the connecting screw and the valve stem base. The valve core can rise under the action of the air passage and fall under the action of the helical spring after the gas is discharged.

[0012] Preferably, the connection socket is a pin socket; the pin socket is also provided with a first quick-connect connector and a second quick-connect connector, the first quick-connect connector is used to connect to the air inlet pipe, and the second quick-connect connector is connected to the pneumatic diaphragm valve through the air pipe.

[0013] The present invention also provides a control method for a bus-type valve based on any one of the above technical solutions, including a pneumatic diaphragm valve open state and a pneumatic diaphragm valve closed state, wherein: When the main station controls the pneumatic diaphragm valve to be in the open state via the controller, the valve core of the pneumatic diaphragm valve rises, the valve stem base contacts the valve core, and under the action of the valve core, it drives the valve stem and valve stem extension plate to rise. At this time, the helical spring is compressed and in a compressed state. When the valve core rises to the valve stem extension plate reaching the sensing area of ​​the proximity switch, the valve stem extension plate is sensed by the proximity switch. The proximity switch transmits the signal to the circuit board of the controller, and then transmits the signal to the main station. After the main station recognizes it, the feedback signal is transmitted to the solenoid valve through the circuit board, so that the solenoid valve direction is switched to the air-off state. The gas in the pneumatic diaphragm valve is discharged in sequence through the air pipe and the exhaust hole at the controller base. When the main station controls the pneumatic diaphragm valve to be in the closed state via the controller, after the gas inside the pneumatic diaphragm valve is expelled, the valve core descends. At this time, the two helical springs reset under the action of elastic restoring force, and drive the valve stem base downward until the valve stem base is in contact with the valve core. At the same time, the valve stem drives the valve stem extension plate to descend along with the valve stem base. When the valve core descends to the point that the valve stem extension plate is no longer in the sensing area of ​​the proximity switch, the valve stem extension plate can no longer be sensed by the proximity switch. At this time, the main station has no proximity switch signal and can automatically determine whether to transmit a signal and switch the solenoid valve to the open state.

[0014] The present invention achieves the following technical effects compared to the prior art: The present invention provides a bus-type valve and its control method. The bus-type valve, serving as a slave station for communication with a master station, includes a housing, a controller, and an actuator. The actuator is located below the housing, and the controller is located inside the housing, above the actuator. A proximity switch is provided at the controller. Below the actuator is a pneumatic diaphragm valve. A connection socket is provided on the side wall of the housing, which is electrically connected to the controller and is used to connect to the master station. The controller can control the opening and closing of the air circuit under the control of the master station and actuate the pneumatic diaphragm valve. When the pneumatic diaphragm valve actuates, it can contact or not contact the proximity switch, and the proximity switch... The switch transmits signals to the controller or not, and after the master station sets the data, it can automatically control the opening and closing of the pneumatic diaphragm valve without manual intervention, saving manpower. At the same time, the bus design allows the power lines and signal lines of individual pneumatic diaphragm valves to be integrated into the slave station, and all pneumatic diaphragm valves can be connected to the master station via the corresponding bus valve's connection socket and connector. The structure is simple, the wiring is convenient, and it is suitable for long-distance signal transmission. For the actuator part, the interaction between various mechanical mechanisms can reduce the proportion of electronic components and resist signal interference. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the bus-type valve in Example 1; Figure 2 This is a cross-sectional view of the bus-type valve in Example 1; Figure 3 This is a bus block diagram of the bus-type valve in Example 1; Figure 4 This is an internal control block diagram of the bus-type valve in Example 1; In the diagram: 1-Cover, 2-Circuit board, 3-Solenoid valve, 4-Controller base, 5-First quick-change connector, 6-Second quick-change connector, 7-Pneumatic diaphragm valve, 8-Circuit board mounting plate, 9-Proximity switch mounting plate, 10-Proximity switch, 11-Valve stem extension plate, 12-Extension plate screw, 13-Valve stem, 14-Connecting socket, 15-Sleeve, 16-Washer ring, 17-Helical spring, 18-First O-ring seal, 19-Pressure plate, 20-Connecting screw, 21-Second O-ring seal, 22-Valve stem base, 23-Valve core. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The purpose of this invention is to provide a bus-type valve and its control method to solve the problems existing in the prior art, making the structure simple, the wiring convenient, and the anti-interference ability strong.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1 like Figures 1-4As shown, this embodiment provides a bus-type valve, which serves as a slave station for communication with a master station. The bus-type valve includes a housing 1, a controller, and an actuator. The actuator is located below the housing 1, and the controller is located inside the housing 1, above the actuator. A proximity switch 10 is provided at the controller. Below the actuator is a pneumatic diaphragm valve 7. A connection socket 14 is provided on the side wall of the housing 1. The connection socket 14 is electrically connected to the controller and is used to connect to the master station (e.g., a computer or industrial control computer). Under the control of the master station, the controller can control the opening and closing of the air passage and actuate the pneumatic diaphragm valve 7. When the pneumatic diaphragm valve 7 actuates, it can make or not make contact with the connection socket. The proximity switch 10 can transmit a signal to the controller or not, thus automatically controlling the opening and closing of the pneumatic diaphragm valve 7 after the master station sets the data, without manual intervention, saving manpower. At the same time, the bus design allows the power lines and signal lines of a single pneumatic diaphragm valve 7 to be integrated to the slave station, and all pneumatic diaphragm valves 7 can be connected to the master station via the corresponding bus valve's connection socket 14 and connector wires. The structure is simple, the wiring is convenient, and it is suitable for long-distance signal transmission. For the actuator part, the interaction between various mechanical mechanisms can reduce the proportion of electronic components and resist signal interference.

[0021] Specifically, the controller includes a controller base 4, a circuit board 2, a solenoid valve 3, and a proximity switch 10. The upper end of the controller base 4 is connected to the lower opening of the housing 1. The circuit board 2 is installed inside the housing 1. The solenoid valve 3 is connected to the controller base 4 by screws. The connection socket 14, the solenoid valve 3, and the proximity switch 10 are all electrically connected to the circuit board 2 to realize the conduction and control of the circuit. The circuit board 2 and the solenoid valve 3 are connected by wires to transmit electrical signals to control the opening and closing of the air passage.

[0022] The controller base 4 is installed on the lower end of the cover 1 by screws, and a sealing ring is provided between the upper end of the controller base 4 and the lower end of the cover 1.

[0023] The circuit board 2 is mounted on the controller base 4 via the circuit board fixing plate 8, and the circuit board 2 is positioned near the upper end of the cover 1.

[0024] The proximity switch 10 is pressed onto the proximity switch mounting plate 9 by a nut, and the proximity switch mounting plate 9 is connected to the upper end of the controller base 4 by screws.

[0025] The proximity switch mounting plate 9 has an oblong hole, the proximity switch 10 is installed in the oblong hole, and the position of the proximity switch 10 in the oblong hole can be adjusted so that the position of the proximity switch 10 can be adjusted to suit different types of pneumatic diaphragm valves 7.

[0026] The pneumatic diaphragm valve 7 and the lower end of the controller base 4 are connected by a connecting screw 20. The upper end of the connecting screw 20 is limited to the lower opening of the controller base 4 by a stepped surface, and the upper end face of the connecting screw 20 is provided with a first groove. A first O-ring 18 is embedded in the first groove. The first O-ring 18 is pressed between the upper end face of the connecting screw 20 and the lower end face of the controller base 4, thereby achieving a seal between the upper end face of the connecting screw 20 and the lower end face of the controller base 4 through the first O-ring 18, preventing gas leakage through this point. The step of the connecting screw 20... A pressure plate 19 is also provided below the surface. The pressure plate 19 is embedded between the stepped surface of the connecting screw 20 and the lower end of the controller base 4. The lower end of the connecting screw 20 can extend into the pneumatic diaphragm valve 7. The lower end face of the head of the connecting screw 20 is provided with a second groove. A second O-ring 21 is embedded in the second groove. The second O-ring 21 is pressed between the lower end face of the head of the connecting screw 20 and the upper end face of the pneumatic diaphragm valve 7. Thus, the second O-ring 21 achieves a seal between the lower end face of the head of the connecting screw 20 and the upper end face of the pneumatic diaphragm valve 7, preventing gas leakage through this point.

[0027] The actuator includes a valve stem extension plate 11, a bushing 15, a helical spring 17, and a pneumatic diaphragm valve 7. The pneumatic diaphragm valve 7 includes a valve stem 13, a valve stem base 22, and a valve core 23. A through hole is provided in the middle of the connecting screw 20, which extends through the connecting screw 20 along its length. A washer 16 is installed in the through hole, thereby limiting the washer 16 by the connecting screw 20 to ensure the concentricity of the washer 16. The bushing 15 is located in an elongated hole on the controller base 4, and the bushing 15 is located above the washer 16. The upper end of the valve stem 13 can pass through the bushing 15 under the limiting effect of the washer 16 and connect to the valve stem extension plate 11 located above the bushing 15. The valve stem extension plate 11 is connected to the controller base 4 by extension plate screws 12. The valve stem 13 and the valve stem extension plate 11 constitute a valve stem 13 assembly, and the bushing 15 reduces friction with the controller base 4 and provides positioning. The lower end of valve stem extension plate 11 is provided with a limiting protrusion, which is used to embed into the limiting groove of the controller base 4 and achieve mutual limiting to restrict the rotation of valve stem extension plate 11. The upper end of valve stem extension plate 11 extends away from pneumatic diaphragm valve 7. Valve stem extension plate 11 can move under the drive of valve stem 13 and be sensed by proximity switch 10, or not be sensed by proximity switch 10. The lower end of valve stem 13 is connected to valve stem base 22, which is located above valve core 23. During the upward movement of valve stem base 22, it is limited by connecting screw 20. During the downward movement, the controller base 4 limits the support of valve stem extension plate 11. A helical spring 17 is provided between the lower end face of gasket 16 and the inner bottom surface of connecting screw 20, and between the lower end face of connecting screw 20 and valve stem base 22. Valve core 23 can rise under the action of air passage and fall under the action of helical spring 17 after gas is discharged.

[0028] The connector 14 is a pin-type connector. One side of the pin-type connector is used to connect to the main station via a connector cable, and the other side is connected to the circuit board 2 for power supply and signal transmission. The pin-type connector is also equipped with a first quick-connect connector 5 and a second quick-connect connector 6. The first quick-connect connector 5 is used to connect to the air intake pipe, and the second quick-connect connector 6 is connected to the pneumatic diaphragm valve 7 via the air vent pipe.

[0029] In this embodiment, an indicator light can also be installed on the bus-type valve to indicate its working status.

[0030] In this embodiment, the bus only needs a two-core cable to transmit data and power simultaneously, saving a large number of power supply lines, making the wiring extremely simple and the power consumption extremely low.

[0031] Example 2 This embodiment provides a control method for a bus-type valve as described in Embodiment 1, including an open state and a closed state of the pneumatic diaphragm valve 7, wherein: When the main station controls the pneumatic diaphragm valve 7 to be in the open state via the controller, the valve core 23 of the pneumatic diaphragm valve 7 rises, the valve stem base 22 contacts the valve core 23, and under the action of the valve core 23, the valve stem 13 and the valve stem extension plate 11 rise. At this time, the helical spring 17 is compressed and in a compressed state. When the valve core 23 rises to the valve stem extension plate 11 reaching the sensing area of ​​the proximity switch 10, the valve stem extension plate 11 is sensed by the proximity switch 10. The proximity switch 10 transmits the signal to the circuit board 2 of the controller, and then transmits the signal to the main station. After the main station recognizes it, the feedback signal is transmitted to the solenoid valve 3 through the circuit board 2, so that the solenoid valve 3 switches to the air-off state. The gas in the pneumatic diaphragm valve 7 is discharged in sequence through the air pipe and the exhaust hole at the controller base 4. When the main station controls the pneumatic diaphragm valve 7 to be in the closed state via the controller, after the gas inside the pneumatic diaphragm valve 7 is discharged, the valve core 23 descends. At this time, the two helical springs 17 are reset under the action of elastic restoring force, and drive the valve stem base 22 to push downward until the valve stem base 22 and the valve core 23 are in contact. At the same time, the valve stem 13 drives the valve stem extension plate 11 to descend along with the valve stem base 22. When the valve core 23 descends to the point that the valve stem extension plate 11 is out of the sensing area of ​​the proximity switch 10, the valve stem extension plate 11 can no longer be sensed by the proximity switch 10. At this time, the main station has no signal from the proximity switch 10 and can automatically determine whether to transmit a signal and switch the solenoid valve 3 to the open state.

[0032] Through the above design, all components are integrated inside the bus-type valve. When connecting to the master station, only a single connector cable needs to be brought out from the outside of the bus-type valve, simplifying wiring and significantly reducing hardware and installation costs compared to existing structures. Furthermore, various bus topologies enable easy "lantern-like" networking, requiring no specialized tools, facilitating maintenance and troubleshooting. This allows even non-professionals to quickly locate problems. Each master station can connect to up to 62 slave stations, enabling multi-device collaboration. Moreover, the master station automatically performs necessary functions and diagnostics, facilitating problem detection and resolution. Firstly, it features automatic correction; secondly, it uses current signal transmission, ensuring stable signal and suitability for harsh working conditions; thirdly, it is specifically designed for simple field devices, enabling efficient deployment and supporting a maximum transmission distance of 600 meters, thus making it suitable for large equipment; on the other hand, due to its primarily mechanical structure, it has a lower failure rate, requires no maintenance, and compared to other products, it has a simpler and more compact structure, stronger functionality, stronger resistance to external interference, and a simpler feedback method; in terms of adaptability, it can be easily adapted to different pneumatic diaphragm valves 7 by adjusting the length of the valve stem 13 and the washer ring 16, further saving costs.

[0033] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A bus-type valve, characterized in that: The device includes a housing, a controller, and an actuator. The actuator is located below the housing, and the controller is located inside the housing and above the actuator. A proximity switch is provided at the controller. A pneumatic diaphragm valve is located below the actuator. A connection socket is provided on the side wall of the housing. The connection socket is electrically connected to the controller and is used to connect to a master station. The controller can control the opening and closing of the air circuit under the control of the master station and actuate the pneumatic diaphragm valve. When the pneumatic diaphragm valve actuates, it can contact or not contact the proximity switch, and the proximity switch can transmit a signal to the controller or not transmit a signal.

2. The bus-type valve according to claim 1, characterized in that: The controller includes a controller base, a circuit board, a solenoid valve, and a proximity switch. The upper end of the controller base is connected to the lower opening of the housing. The circuit board is installed inside the housing. The solenoid valve is connected to the controller base by screws. The connection socket, the solenoid valve, and the proximity switch are all electrically connected to the circuit board.

3. The bus-type valve according to claim 2, characterized in that: The controller base is installed on the lower end of the cover by screws, and a sealing ring is provided between the upper end of the controller base and the lower end of the cover.

4. The bus-type valve according to claim 2, characterized in that: The circuit board is mounted on the controller base via a circuit board mounting plate, and the circuit board is positioned near the upper end of the housing.

5. The bus-type valve according to claim 2, characterized in that: The proximity switch is pressed onto the proximity switch mounting plate by a nut, and the proximity switch mounting plate is connected to the upper end of the controller base by screws.

6. The bus-type valve according to claim 5, characterized in that: The proximity switch mounting plate is provided with an oblong hole, the proximity switch is installed in the oblong hole, and the position of the proximity switch in the oblong hole is adjustable.

7. The bus-type valve according to claim 2, characterized in that: The pneumatic diaphragm valve and the lower end of the controller base are connected by a connecting screw. The upper end of the connecting screw is limited to the lower opening of the controller base by a stepped surface, and the upper end face of the connecting screw is provided with a first groove. A first O-ring is embedded in the first groove. The first O-ring is pressed between the upper end face of the connecting screw and the lower end face of the controller base. A pressure plate is also provided below the stepped surface of the connecting screw. The pressure plate is embedded between the stepped surface of the connecting screw and the lower end of the controller base. The lower end of the connecting screw can extend into the pneumatic diaphragm valve, and the lower end face of the head of the connecting screw is provided with a second groove. A second O-ring is embedded in the second groove. The second O-ring is pressed between the lower end face of the head of the connecting screw and the upper end face of the pneumatic diaphragm valve.

8. The bus-type valve according to claim 7, characterized in that: The actuator includes a valve stem extension plate, a bushing, a helical spring, and the pneumatic diaphragm valve. The pneumatic diaphragm valve includes a valve stem, a valve stem base, and a valve core. A through hole is provided in the middle of the connecting screw, extending through the connecting screw along its length. A washer is installed within the through hole. The bushing is located within an elongated hole on the controller base, and is positioned above the washer. The upper end of the valve stem can pass through the bushing under the constraint of the washer and connect to the valve stem extension plate located above the bushing. The valve stem extension plate... The upper end extends away from the pneumatic diaphragm valve. The valve stem extension plate can move under the action of the valve stem and may or may not be sensed by the proximity switch. The lower end of the valve stem is connected to the valve stem base, which is located above the valve core. A helical spring is provided between the lower end face of the washer and the inner bottom face of the connecting screw, and between the lower end face of the connecting screw and the valve stem base. The valve core can rise under the action of the air passage and fall under the action of the helical spring after the gas is discharged.

9. The bus-type valve according to claim 1, characterized in that: The connection socket is a pin socket; the pin socket is also provided with a first quick-connect connector and a second quick-connect connector, the first quick-connect connector is used to connect to the air inlet pipe, and the second quick-connect connector is connected to the pneumatic diaphragm valve through the air pipe.

10. A control method for a bus-type valve based on any one of claims 1-9, characterized in that: This includes the pneumatic diaphragm valve's open and closed states, where: When the main station controls the pneumatic diaphragm valve to be in the open state via the controller, the valve core of the pneumatic diaphragm valve rises, the valve stem base contacts the valve core, and under the action of the valve core, it drives the valve stem and valve stem extension plate to rise. At this time, the helical spring is compressed and in a compressed state. When the valve core rises to the valve stem extension plate reaching the sensing area of ​​the proximity switch, the valve stem extension plate is sensed by the proximity switch. The proximity switch transmits the signal to the circuit board of the controller, and then transmits the signal to the main station. After the main station recognizes it, the feedback signal is transmitted to the solenoid valve through the circuit board, so that the solenoid valve direction is switched to the air-off state. The gas in the pneumatic diaphragm valve is discharged in sequence through the air pipe and the exhaust hole at the controller base. When the main station controls the pneumatic diaphragm valve to be in the closed state via the controller, after the gas inside the pneumatic diaphragm valve is expelled, the valve core descends. At this time, the two helical springs reset under the action of elastic restoring force, and drive the valve stem base downward until the valve stem base is in contact with the valve core. At the same time, the valve stem drives the valve stem extension plate to descend along with the valve stem base. When the valve core descends to the point that the valve stem extension plate is no longer in the sensing area of ​​the proximity switch, the valve stem extension plate can no longer be sensed by the proximity switch. At this time, the main station has no proximity switch signal and can automatically determine whether to transmit a signal and switch the solenoid valve to the open state.

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