Valve opening and closing time counting system and opening and closing system

Abstract

The application provides a valve opening and closing time counting system and an opening and closing system. The valve opening and closing time counting system comprises a travel switch, a trigger module and a timing module. An input pin of the travel switch is connected to a valve for collecting the opening and closing state of the valve. An output pin of the travel switch is connected to a first input pin of the trigger module. A second input pin of the trigger module is connected to a command input end of the valve for collecting a valve opening and closing command. An output pin of the trigger module is connected to an input pin of the timing module for triggering the start or stop of the timing module. The opening and closing state of the valve is obtained through the first input pin of the trigger module, and the valve opening and closing command signal is obtained through the second input pin. The start or stop of the timing module is triggered according to the obtained opening and closing state of the valve and the valve opening and closing command signal, so as to count the valve opening and closing time, quantify the time required for the valve opening and closing action, and improve the production safety and equipment reliability.

Description

Technical Field

[0001] This application relates to the field of industrial automation control, and in particular to a valve switching time statistics system and a switching system. Background Technology

[0002] In industries such as chemical engineering, energy, and manufacturing, on / off valves are critical fluid control components widely used in core processes such as boiler feedwater shut-off, desuperheating water regulation, gasified coal slurry transportation, and oxygen supply. However, during long-term operation, valves frequently encounter malfunctions such as valve body jamming, slow actuator response, and cylinder seal failure. These abnormalities directly lead to a significant increase in valve opening and closing time, potentially causing production interruptions, equipment damage, or even safety accidents. Accurately obtaining the valve's on / off status is fundamental to process monitoring, but even more crucial is the real-time quantification of the time required for the opening and closing action. Currently, industrial sites generally rely on limit switches to detect the valve's open or closed position, but lack a systematic measurement and statistical mechanism for the opening and closing time.

[0003] Operators often struggle to obtain accurate valve actuation time data, hindering effective intervention in the early stages of malfunctions and leading to a continuous accumulation of problems that eventually disrupt normal production processes. Therefore, existing technologies have significant shortcomings in monitoring valve opening and closing times, necessitating the development of a simple, reliable, and easily integrated statistical solution. Utility Model Content

[0004] In view of this, embodiments of this application provide a valve switching time statistics system, which can quantify the time required for valve switching actions in real time, facilitating early detection of potential faults, improving production safety and equipment reliability, and thus addressing the technical deficiencies existing in the prior art. Embodiments of this application also provide a switching system.

[0005] According to a first aspect of the embodiments of this application, a valve switching time statistics system is provided, including: a limit switch, a trigger module, and a timing module; The input pin of the limit switch is connected to the valve to acquire the valve's open / closed state, and the output pin of the limit switch is connected to the first input pin of the trigger module. The second input pin of the trigger module is connected to the command input terminal of the valve to collect valve opening and closing commands. The output pin of the trigger module is connected to the input pin of the timing module to trigger the start or stop of the timing module.

[0006] In one or more embodiments of this application, the triggering module includes a valve opening triggering unit and a valve closing triggering unit, and the timing module includes a valve opening timing unit and a valve closing timing unit; The first input pins of the valve opening trigger unit and the valve closing trigger unit are respectively connected to the output pins of the limit switch, and the second input pins of the valve opening trigger unit and the valve closing trigger unit are respectively connected to the command input terminal of the valve. The output pin of the valve opening trigger unit is connected to the input pin of the valve opening timing unit, and the output pin of the valve closing trigger unit is connected to the input pin of the valve closing timing unit.

[0007] In one or more embodiments of this application, the valve opening timing unit and the valve closing timing unit further include a reset pin; The output pin of the valve opening trigger unit is also connected to the reset pin of the valve closing timer unit, and the output pin of the valve closing trigger unit is also connected to the reset pin of the valve opening timer unit.

[0008] In one or more embodiments of this application, the limit switch is an analog limit switch used to acquire the analog opening signal of the valve; the switching time statistics system further includes a first comparator; The input pin of the first comparator is connected to the output pin of the analog limit switch, and is used to compare the opening analog signal with a preset valve opening threshold to obtain the valve's open state signal or closed state signal, which is then transmitted to the first input pin of the trigger module.

[0009] In one or more embodiments of this application, the switching time statistics system further includes a fault detection module, which includes a second comparator; The input pin of the second comparator is connected to the output pin of the analog limit switch, and is used to compare the opening analog signal with the preset over-limit opening to obtain a fault indication signal and output it.

[0010] In one or more embodiments of this application, the limit switch is a digital limit switch used to acquire the switching digital signal of the valve and transmit the switching digital signal to the first input pin of the trigger module.

[0011] In one or more embodiments of this application, the switching time statistics system further includes a fault detection module, which includes a third comparator; The input pin of the third comparator is connected to the output pin of the digital limit switch to identify whether the on and off digital signals are acquired simultaneously, obtain a fault indication signal and output it.

[0012] In one or more embodiments of this application, the timing module includes a timer or an accumulator unit; the accumulator unit includes an accumulator and a multiplication unit, the output pin of the accumulator is connected to the first input pin of the multiplication unit, and the second input pin of the multiplication unit is connected to the system scan cycle output terminal.

[0013] In one or more embodiments of this application, the switching time statistics system further includes a delay unit for signal delay transmission; The input pin of the delay unit is connected to the command input terminal of the valve, and the output pin of the delay unit is connected to the second input pin of the trigger module.

[0014] According to a second aspect of the embodiments of this application, a switching system is provided, including: a valve and a switching time statistics system of any one of the above.

[0015] This application provides a valve opening and closing time statistics system and an opening and closing system. The system obtains the valve status and commands through a trigger module, triggers the start or stop of the timing module, and thus counts the valve opening and closing time. It has the advantages of being able to quantify the time required for valve opening and closing actions in real time, facilitating early detection of potential faults, and improving production safety and equipment reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a valve opening and closing time statistics system provided in one embodiment of this application; Figure 2 This is a schematic flowchart of a valve opening and closing time statistics system provided in one embodiment of this application; Figure 3 This is a schematic diagram of a switching system provided in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of a valve switching time statistics system including an analog limit switch and a timer, according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a valve switching time statistics system including a switching limit switch and a timer, according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a valve switching time statistics system including an analog limit switch and an accumulator according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a valve switching time statistics system including a switching limit switch and an accumulator, provided in an embodiment of this application. Detailed Implementation

[0017] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0018] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0019] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first.

[0020] First, the terminology used in one or more embodiments of the present invention will be explained.

[0021] Switching valve: refers to a valve that functions as a shut-off valve. Switching valves are divided into pneumatic switching valves and electric switching valves. Pneumatic switching valves use control air from the air circuit to send control air to the operating cylinder in the valve to move the piston, which in turn moves the slider to change the valve position, resulting in a relatively fast switching time. Electric switching valves, on the other hand, use a spiral coil to generate electromagnetic attraction to move the slider to change the valve position, resulting in a slower switching time than pneumatic valves.

[0022] Limit switches, also called position switches or limit switches, are commonly used low-current control electrical appliances. Signals are divided into switch type and analog type. Switch type limit switches utilize the collision of moving parts in production machinery to actuate their contacts, thereby connecting or disconnecting the control circuit to achieve a specific control purpose. Typically, these switches are used to limit the position or travel of mechanical movement, causing the machinery to automatically stop, reverse, change speed, or automatically reciprocate at a certain position or travel. Analog type limit switches utilize the displacement of mechanical movement to change the resistance value of the potentiometer inside the analog limit switch, thereby changing the circuit current (typically 4-20 mA DCD), which is then transmitted to a DCS or PLC control system for display.

[0023] In chemical process control systems, the switching action time of on / off valves lacks an effective real-time monitoring mechanism. Due to the mechanical characteristics of valve actuators and the influence of external environmental factors, problems such as valve body jamming or cylinder surging often lead to delayed action response. Existing systems rely solely on limit switches to obtain valve position status signals, failing to accurately capture the time difference between the switching command signal and the status change signal. Limit switches only provide binary state information of the valve being open or closed, but lack a time-series correlation analysis mechanism between command and status signals, preventing the system from quantitatively evaluating the valve action process. Furthermore, this deficiency leads to the failure to identify early anomalies in valve health, thereby affecting the continuity of production and the effectiveness of fault early warning mechanisms.

[0024] For example, in the coal slurry conveying system of a coal chemical plant's gasifier, the slurry shut-off valve needs to perform high-frequency switching operations to control the material flow. When the control system sends an opening command signal to the valve input, the actual valve opening action lags behind the command signal due to increased mechanical resistance caused by wear of the valve stem seal. However, the limit switch can only provide feedback on the final open position signal and cannot record the complete time interval from the issuance of the command signal to the confirmation of the status signal. In this scenario, the operator can only confirm the final valve position through the status indication of the limit switch, but cannot know whether there is any abnormal delay in the action process. This results in potential valve malfunctions not being detected in time, thus affecting the stability of the material supply in the gasification reaction process.

[0025] If the above problems are not addressed, the lack of monitoring of valve actuation time will render the equipment health assessment mechanism ineffective. As the service life of valves extends, increased wear on mechanical components may further prolong actuation time, but the system lacks quantitative data support in the time dimension, making it impossible to detect potential faults in their early stages. Consequently, unidentified anomalous actions may gradually accumulate, eventually leading to unplanned production interruptions and posing a potential threat to process safety boundaries, while also weakening the control system's ability to monitor the operational status of critical actuators.

[0026] In response, Figure 1 A valve switching time statistics system according to an embodiment of the present application is shown, including: a limit switch 102, a trigger module 104 and a timing module 106; The input pin of the limit switch 102 is connected to the valve to collect the valve's opening and closing status, and the output pin of the limit switch 102 is connected to the first input pin of the trigger module 104. The second input pin of the trigger module 104 is connected to the command input terminal of the valve to collect valve opening and closing commands. The output pin of the trigger module 104 is connected to the input pin of the timing module 106 to trigger the start or stop of the timing module 106.

[0027] The trigger module 104 is responsible for receiving valve status signals from the limit switch 102 and switching commands from the valve command input terminal. By performing logical judgment on these two signals, the trigger module 104 can generate control signals to start or stop the timing module 106.

[0028] Timing module 106: This module receives start or stop signals from trigger module 104 and accurately measures and records the time required for the valve to complete its action from receiving the command. Timing module 106 can be a counter or accumulator for accumulating time periods.

[0029] Valves: Mechanical devices used in industrial processes to control the flow rate, pressure, or direction of fluids (gas, liquid, slurry, etc.). Their opening and closing actions are a critical part of the production process.

[0030] Command input terminal: The interface through which the valve receives opening or closing commands from an external control system (such as a DCS, PLC, or SIS system). These commands are the starting signals for valve operation.

[0031] The valve opening and closing time statistics system proposed in this application is characterized by the effective statistics of valve opening and closing time achieved through the coordinated operation of limit switch 102, trigger module 104 and timing module 106.

[0032] Specifically, the input pin of limit switch 102 is connected to the valve, and its function is to acquire the valve's open / closed state. As one implementation, limit switch 102 can be a simple mechanical limit switch. When the valve moves to its fully open or fully closed position, the contacts of the limit switch physically make or separate, generating an electrical signal, for example, a high level indicating the "open" state and a low level indicating the "closed" state. This signal is then transmitted through the output pin of limit switch 102.

[0033] As a specific implementation method, limit switches are divided into analog limit switches and digital limit switches. Analog limit switches can be installed on the rotating shaft of the valve actuator. Analog limit switches can provide 4-20 mA DC signals with two-wire wiring. Their function is to convert the actual valve position into an electrical signal and return it to the control system such as a DCS or PLC system for upper-level display and logic control. Digital limit switches have open and closed feedback and are installed on the rotating shaft of the valve actuator in the field. They generally provide digital signals, with both the open and closed position signals being two-wire connections. Their function is to convert the actual valve position in the field into digital contact signals and return them to the DCS or PLC system, corresponding to the fully open and fully closed valve positions for upper-level display and logic control.

[0034] As a specific implementation method, the limit switch can be configured according to the valve type (such as ball valve, butterfly valve, gate valve, etc.) and the actuator type (such as electric, pneumatic): For multi-turn valves (such as gate valves): it is usually installed on the output shaft (valve stem) of the actuator or on a cam assembly linked to the valve stem. For angle-stroke valves (such as ball valves, butterfly valves): it is usually installed on the rotating output shaft of the actuator and triggered by an adjustable-angle cam or eccentric wheel. The input pin of the limit switch is connected to the moving parts of the valve through a mechanical linkage. The input pin of the limit switch is connected to the valve status signal acquisition circuit through a shielded cable. Its common terminal is connected to the power supply, and the output pin is connected to the trigger module. When the valve reaches the position, the mechanical action causes the switch contacts to close or open, thereby changing the level of the output pin.

[0035] The valve opening and closing time statistics system is connected to the valve via limit switches. However, the triggering module, timing module, etc., are electrically isolated from the limit switches and are usually installed in a control box, such as a control cabinet or control system (such as a PLC / DCS cabinet), and are electrically connected to the limit switches. Only the limit switches themselves are installed on the valve actuator.

[0036] To ensure safe and reliable connections, the following points should generally be specified: 1. Limit switches should have a protection rating (e.g., IP65 / IP67) matching the site environment to be waterproof, dustproof, and explosion-proof (explosion-proof types, such as Ex d IICT6, should be selected in hazardous areas). 2. Mounting brackets should be stable to prevent displacement due to vibration. The switch's transmission components (such as roller arms) should have measures to prevent damage from overtravel. 3. Signal isolators or safety barriers can be added to signal lines (especially in explosion-proof areas or for long-distance transmission) to isolate interference and limit voltage and current. Cables should be laid using metal conduits or cable trays to prevent mechanical damage and electromagnetic interference. 4. For critical valves, a redundant configuration of dual-limit switches (one for control, one for interlocking / monitoring) can be used to improve reliability.

[0037] The output pin of limit switch 102 is connected to the first input pin of trigger module 104. Specifically, the first input pin is a dedicated digital input channel on the trigger module. In complex systems, this signal may first enter a digital input module (such as a PLC's DI card), and then the module transmits the data to the trigger module, which acts as a logic processing unit, via a bus (such as PROFIBUS, Ethernet / IP). In a specific implementation, the trigger module may be a program block or dedicated circuit within the PLC. Through this connection, trigger module 104 can receive the current state information of the valve in real time. For example, when the valve starts to open from the closed state, the output signal of limit switch 102 will change from the "closed" state to the "open" state, and this state change is captured by trigger module 104.

[0038] The second input pin of the trigger module 104 is connected to the valve's command input terminal to acquire valve opening and closing commands. The command input terminal typically receives electrical signals from the control system, instructing the valve to perform an opening or closing operation. Specifically, the valve's command input terminal refers to the electrical interface that receives open / close operation commands from the control system (such as DCS, PLC). It is usually located on the control unit of the valve actuator or the coil of the solenoid valve. Common forms include: Dry contact signals: Most commonly used. The control system provides a passive contact via a relay output (DO), which, when closed, represents an "open command" or "close command." Level signals: For example, a 24VDC high level represents "open," and 0V represents "stop" or "close." Commonly used for direct connection to PLC digital output modules. Pulse signals: A short pulse (e.g., 1-2 seconds) represents "open," and another pulse represents "close." Analog signals or bus signals: For control valves, the command may be a 4-20mA analog signal or a fieldbus (such as PROFIBUS PA) message. The second input pin of the trigger module is connected via a cable to the source or path of this command signal. Similarly, this connection can be electrically isolated using an optocoupler or an isolating relay to prevent high voltage or interference from entering the trigger module. As one implementation, the trigger module 104 can be a logic judgment circuit containing multiple logic gates to receive and process status signals from the limit switch 102 and control commands from the command input terminal. For example, when a "valve open" command is received, the trigger module 104 waits for a change in the state of the limit switch 102. The trigger module 104 can be an AND gate to determine if the condition "command issued and valve not in position" is met, thus starting the timer. Alternatively, it can be an XOR gate to detect state changes. When the command state and the valve state are inconsistent (one high and one low), it indicates that the valve is in operation and can be used to trigger the timer. For example, the signal in operation = (valve open command) XOR (valve open state). During the process of the valve moving from closed to open, the command is "open" (1), the open state is "closed" (0), the output is 1, and the timer starts. When the valve is fully open, the open state becomes 1, the output becomes 0, and the timer stops. Alternatively, an edge detection circuit, composed of AND gates, NOT gates, and D flip-flops, can more accurately detect the rising edge of the instruction signal (the instant from 0 to 1), generating a pulse only at the moment the instruction is issued to start the timing, avoiding repeated triggering when the instruction remains high. Of course, this can also be implemented using a PLC or microcontroller. In actual PLC or microcontroller implementations, these logical functions are implemented through ladder diagrams, structured text, or function block diagrams, essentially equivalent to hardware logic gates but with greater flexibility.

[0039] The output pin of the trigger module 104 is connected to the input pin of the timing module 106 to trigger the start or stop of the timing module 106. When the trigger module 104 determines that the timing condition is met based on the received valve status and command (e.g., receiving a "open valve" command and the valve status changes from "closed" to "open"), it sends a start signal to the timing module 106. When the timing condition ends (e.g., the valve reaches the "open" state), it sends a stop signal.

[0040] After receiving a start or stop signal from the trigger module 104, the timing module 106 starts or stops timing. The limit switch 102 includes input pins: primarily referring to its mechanical triggering mechanism (such as a roller arm), which receives changes in the physical position of the valve. Output pins: referring to the terminals (such as COM, NO, NC) that its internal electrical contacts connect to the outside, functioning to output a switching signal representing the valve's limit position (fully open / fully closed). The first input pin of the trigger module 104 is the valve status signal input port. Its function is to receive a switching signal (high / low level) representing the actual valve position from the limit switch. The second input pin is the control command input port. Its function is to receive a switching command signal representing the expected valve action from the control system. The output pin is the timing control signal output port. Its function is to output a high / low level pulse or hold signal to the timing module to start or stop timing based on the internal logic judgment result. The input pins of the timing module 106 are timing control signal input ports. Their function is to receive start / stop signals from the trigger module. Core function: a high-precision timer / counter. When a "start" signal is received, the time accumulation begins (usually accurate to milliseconds), and the accumulation ends when a "stop" signal is received. The time of this action (such as the travel time of the valve from fully closed to fully open) is stored or transmitted to the host system for display, diagnosis, or predictive maintenance.

[0041] Specifically, when the control system sends an "open" command to the valve, the command signal is transmitted to the second input pin of the trigger module 104. Simultaneously, the limit switch 102 installed on the valve continuously collects the actual position state of the valve. At this time, the trigger module 104, based on its internal logic, immediately sends a "start timing" signal to the input pin of the timing module 106. Upon receiving this signal, the timing module 106 begins accumulating time. When the valve is fully open and reaches its preset "open" position, the state of the limit switch 102 changes, and the trigger module 104 determines that the valve opening action is complete, then sends a "stop timing" signal to the input pin of the timing module 106.

[0042] After receiving the "stop timing" signal, the timing module 106 stops accumulating the time and outputs the total time elapsed from start to stop. This time value is the actual time taken for the valve to fully open from receiving the opening command. In this way, the valve's opening and closing time is accurately calculated.

[0043] Based on the above example, this technical limitation is overcome by introducing the coordinated operation of the limit switch 102, the trigger module 104, and the timing module 106. Specifically, the limit switch 102 is responsible for providing precise valve state change points, while the trigger module 104 cleverly correlates valve commands with actual state changes to generate accurate timing start and stop signals. The timing module 106, based on this, can accurately measure and record the duration of valve action.

[0044] The technical solution of this application provides a valve opening and closing time statistics system, which significantly improves the reliability and safety of industrial automation systems.

[0045] In some of the solutions described above in this application, a trigger module 104 is proposed to trigger the start or stop of the timing module 106. However, in this process, since the trigger module 104 does not distinguish between valve opening and valve closing operations, the timing may be inaccurate or the valve opening and closing time may not be measured independently.

[0046] In this regard, such as Figure 2 As shown, in one embodiment of this disclosure, the trigger module 104 includes a valve opening trigger unit 1041 and a valve closing trigger unit 1042, and the timing module 106 includes a valve opening timing unit 1061 and a valve closing timing unit 1062; the first input pins of the valve opening trigger unit 1041 and the valve closing trigger unit 1042 are respectively connected to the output pins of the limit switch 102, and the second input pins of the valve opening trigger unit 1041 and the valve closing trigger unit 1042 are respectively connected to the command input terminal of the valve; the output pin of the valve opening trigger unit 1041 is connected to the input pin of the valve opening timing unit 1061, and the output pin of the valve closing trigger unit 1042 is connected to the input pin of the valve closing timing unit 1062.

[0047] The valve opening trigger unit 1041 is a logic or circuit module used to detect and respond to valve opening commands and valve state changes. Its function is to accurately identify the moment the valve begins to open and send a start signal to the corresponding timing unit. This unit can be implemented using digital logic gates (such as combinations of AND, OR, and NOT gates), or by function blocks in a programmable logic controller (PLC) or software judgment logic in a microcontroller (MCU). The valve closing trigger unit 1042 is a logic or circuit module used to detect and respond to valve closing commands and valve state changes. Its function is to accurately identify the moment the valve begins to close and send a start signal to the corresponding timing unit. This unit can also be implemented using digital logic gates, PLC function blocks, or software judgment logic in an MCU. The valve opening timing unit 1061 is a module specifically used to measure the time required for the valve to fully open from receiving the valve opening command. Its function is to independently record the valve opening action time. This unit can be implemented using a hardware timer (such as a counter or timer chip), or by timer instructions in a PLC or software timer functions in an MCU. The valve closing timing unit 1062 is a module specifically designed to measure the time required for a valve to fully close after receiving a valve closing command. Its function is to independently record the valve's closing action time. This unit can also be implemented using a hardware timer, a timer instruction in a PLC, or a software timer function in an MCU.

[0048] The first input pins of the valve opening trigger unit 1041 and the valve closing trigger unit 1042 are respectively connected to the output pins of the limit switch 102. This connection ensures that the trigger unit can acquire the actual position or status information of the valve in real time, serving as a key basis for determining whether the valve action is complete. For example, when the limit switch 102 detects that the valve has moved from the closed position to the open position, its output signal will change, and this change will be captured by the valve opening trigger unit 1041. The second input pins of the valve opening trigger unit 1041 and the valve closing trigger unit 1042 are respectively connected to the command input terminal of the valve. This connection allows the trigger module 104 to directly sense the valve opening or closing command issued by the external system, serving as the initial condition for starting the timing process. For example, when the DCS or PLC system issues an "open" command to the valve, this command signal is received by the valve opening trigger unit 1041. The output pin of the valve opening trigger unit 1041 is connected to the input pin of the valve opening timing unit 1061. This connection is used to send a start or stop signal to the valve opening timing unit 1061 when the valve opening trigger unit 1041 determines that the valve opening timing condition is met, thereby precisely controlling the measurement of the valve opening time. The output pin of the valve closing trigger unit 1042 is connected to the input pin of the valve closing timing unit 1062. This connection is used to send a start or stop signal to the valve closing timing unit 1062 when the valve closing trigger unit 1042 determines that the valve closing timing condition is met, thereby precisely controlling the measurement of the valve closing time.

[0049] The valve opening and closing time statistics system of this application, based on the basic architecture of limit switch 102, trigger module 104, and timing module 106, further subdivides the trigger module 104 into valve opening trigger unit 1041 and valve closing trigger unit 1042, and subdivides the timing module 106 into valve opening timing unit 1061 and valve closing timing unit 1062, thereby achieving independent monitoring and timing of valve opening and closing actions. This separate triggering and timing mechanism ensures that the timing of valve opening and closing processes does not interfere with each other, avoiding the inaccurate timing problems caused by operational confusion in traditional solutions. In this way, the system can separately obtain the valve opening and closing times, providing more refined data support for subsequent fault diagnosis and performance evaluation.

[0050] In some of the solutions described above in this application, valve opening timing unit 1061 and valve closing timing unit 1062 are proposed to count the valve opening and closing time respectively. However, during the valve opening and closing process, if there is no proper reset mechanism, the timing unit may be interfered with or miscalculated when switching actions, affecting the accuracy of time statistics and thus failing to reliably detect abnormal valve actions.

[0051] In this regard, such as Figure 2 As shown, in one embodiment of this disclosure, the valve opening timing unit 1061 and the valve closing timing unit 1062 further include a reset pin; the output pin of the valve opening trigger unit 1041 is also connected to the reset pin of the valve closing timing unit 1062, and the output pin of the valve closing trigger unit 1042 is also connected to the reset pin of the valve opening timing unit 1061.

[0052] The reset pin is an interface on the valve-opening timing unit 1061 or the valve-closing timing unit 1062 used to receive external signals to reset its internal timing state to an initial value (usually zero). Its function is to ensure that each timing operation starts from a clear starting point and avoid residual data from the previous operation interfering with the current timing.

[0053] This application proposes a valve opening and closing time statistics system. Building upon basic timing functions, it significantly improves timing accuracy and system reliability by introducing a reset pin for the timing unit and cross-connecting it. Specifically, when the valve receives an opening command and begins operation, the limit switch 102 acquires the valve's open state signal. The valve opening trigger unit 1041 in the trigger module 104 simultaneously receives both the valve's open state signal and the opening command. Once the valve opening trigger unit 1041 determines that the opening conditions are met, its output pin sends a start signal to the valve opening timing unit 1061, initiating timing. Simultaneously, the output pin of the valve opening trigger unit 1041 also sends a reset signal to the reset pin of the valve closing timing unit 1062. This reset signal immediately clears any timing data that may exist in the valve closing timing unit 1062, ensuring that the valve closing timing unit 1062 is inactive during the valve opening process and avoiding data corruption. Similarly, when the valve receives a closing command and begins to operate, the limit switch 102 acquires the valve's closed state signal, and the valve closing trigger unit 1042 in the trigger module 104 simultaneously receives both the valve's closed state signal and the closing command. Once the valve closing trigger unit 1042 determines that the closing condition is met, its output pin sends a start signal to the valve closing timing unit 1062, causing it to start timing. Simultaneously, the output pin of the valve closing trigger unit 1042 also sends a reset signal to the reset pin of the valve opening timing unit 1061. This reset signal immediately clears any timing data that may exist in the valve opening timing unit 1061, ensuring that the valve opening timing unit 1061 is inactive during the valve closing process. Through this cross-reset mechanism, this system can effectively solve the interference problem that may occur in the timing unit when the valve switches between opening and closing actions. When any action (opening or closing) begins, the timing unit for the other action is forcibly reset, thus ensuring that each timing unit only records the time of its corresponding action. This design enables the timing module 106 to accurately count the valve's opening and closing times, avoiding erroneous timing caused by incomplete action switching or signal delays, and providing a reliable data foundation for subsequent valve status monitoring and fault diagnosis.

[0054] Through the above technical solution, this application effectively solves the problems of interference and erroneous timing that may exist in the timing unit during valve opening and closing. When the valve switches from one state to another, such as from the closed state to the open state, the output signal of the valve opening trigger unit 1041 not only activates the valve opening timing unit 1061, but also immediately resets the valve closing timing unit 1062, and vice versa. This cross-reset mechanism ensures that each timing unit records only the pure time of its corresponding action at any given time, avoiding confusion and cumulative errors in timing data. Therefore, this system can provide highly accurate statistics on valve opening and closing times, thereby enabling more reliable detection of abnormal valve actions (such as jamming or slow action), providing accurate data support for timely problem detection and maintenance, and thus ensuring the normal operation of the production process.

[0055] In some of the solutions described above in this application, a limit switch 102 is proposed to collect the valve's opening and closing status. In one embodiment of this disclosure, the limit switch 102 of the valve opening and closing time statistics system is an analog limit switch 102, used to collect the valve's opening degree analog signal. The opening and closing time statistics system also includes a first comparator. The input pin of the first comparator is connected to the output pin of the analog limit switch 102, used to compare the opening degree analog signal with a preset valve opening degree threshold, and obtain the valve's open state signal or closed state signal, which is then transmitted to the first input pin of the trigger module 104.

[0056] Specifically, the analog limit switch 102 is a sensor capable of outputting a continuous analog signal proportional to the valve opening degree. The function of this analog limit switch is to provide continuous and accurate data on the valve opening degree. The first comparator converts the continuous analog signal into discrete open / closed state signals for processing by the trigger module 104. The preset valve opening threshold is a pre-set analog value used to determine whether the valve has reached the "open" or "closed" state. This preset valve opening threshold defines the precise boundary of the valve's open / closed state, ensuring accurate triggering.

[0057] The solution of this application achieves its function in the following way: the analog limit switch is connected to the valve and continuously acquires the valve opening degree analog signal. This signal is continuously changing and can reflect the entire movement process of the valve from fully closed to fully open or from fully open to fully closed in real time. The opening degree analog signal is transmitted to a first comparator. The first comparator compares the received opening degree analog signal with a preset valve opening degree threshold. For example, an "open valve threshold" and a "closed valve threshold" can be set. When the opening degree analog signal exceeds the "open valve threshold", the first comparator outputs an open state signal; when the opening degree analog signal is lower than the "closed valve threshold", the first comparator outputs a closed state signal. These precise open or closed state signals are then transmitted to the first input pin of the trigger module 104. The trigger module 104, in conjunction with the command signal from the valve command input terminal, reliably triggers the start or stop of the timing module 106 according to these precise open / closed state signals. For example, when a valve opening command is received and the first comparator outputs an open state signal, the valve opening timing unit 1061 starts; when a valve closing command is received and the first comparator outputs a closed state signal, the valve closing timing unit 1062 starts. In this way, the starting and stopping of the timing module 106 are based on the precise moment when the actual valve opening degree reaches a preset threshold.

[0058] In one specific implementation, the analog limit switch can be a linear displacement sensor mounted on the valve actuator, such as a potentiometer-type sensor with a 4-20mA output. Its output current value corresponds linearly to the valve opening degree; for example, 0% opening corresponds to 4mA, and 100% opening corresponds to 20mA. The first comparator can be an analog input module integrated into the DCS system, configured with a comparison function. The preset valve opening threshold can be set as follows: when the valve opening reaches 95% (corresponding to 19.2mA), the valve is considered "fully open"; when the valve opening is below 5% (corresponding to 4.8mA), the valve is considered "fully closed." When the valve receives an "open" command, the analog limit switch begins to output a changing current signal. When this current signal rises and first reaches 19.2mA, the first comparator outputs a high-level signal (open state signal) to the first input pin of the trigger module 104. The trigger module 104, in conjunction with the open command, activates the open timing unit 1061. Similarly, when the valve receives a "close valve" command, the current signal output by the analog limit switch decreases. When this current signal first drops below 4.8mA, the first comparator outputs a high-level signal (closed state signal) to the first input pin of the trigger module 104. The trigger module 104, in conjunction with the valve close command, activates the valve close timing unit 1062. During valve operation, if the valve open timing unit 1061 is timing, and the output pin of the valve close trigger unit 1042 is connected to the reset pin of the valve open timing unit 1061, then when the valve close operation begins, the valve open timing unit 1061 will be reset, and vice versa, ensuring the accuracy of the timing.

[0059] By employing the analog limit switch described above, continuous and accurate data on valve opening can be obtained, thus fully capturing the valve's operation process. The first comparator compares this continuous analog opening signal with a preset valve opening threshold, accurately determining whether the valve has truly reached the "open" or "closed" state. The resulting precise open or closed state signal is transmitted to the first input pin of the trigger module 104, ensuring that the timing module 106 starts or stops when the valve actually reaches the target opening, significantly improving the accuracy of valve opening and closing time statistics. This allows for earlier and more accurate detection of abnormalities such as slow valve operation or jamming, enabling timely maintenance and preventing disruption to normal production.

[0060] In some of the solutions described above in this application, an analog limit switch and a first comparator are proposed to detect the open / closed state of the valve. However, in this process, it may be impossible to detect a fault where the valve opening exceeds the preset over-limit opening.

[0061] In one embodiment of this disclosure, the switching time statistics system further includes a fault detection module, which includes a second comparator. The input pin of the second comparator is connected to the output pin of the analog limit switch, and is used to compare the opening analog signal with a preset over-limit opening to obtain a fault indication signal and output it.

[0062] The fault detection module is designed to monitor abnormal states during system operation and generate corresponding fault indications. It can be a standalone hardware circuit unit, such as a dedicated integrated circuit consisting of logic gates, comparators, and output drive circuits; or it can be a software module, implemented in a microcontroller or programmable logic controller (PLC) through programming, responsible for receiving sensor data, executing fault judgment algorithms, and controlling fault output. The second comparator is used to perform threshold judgment on the input analog signal. The input pin of the second comparator is connected to the output pin of the analog limit switch. The opening analog signal is compared with a preset over-limit opening; this comparison operation is the core of fault detection. The preset over-limit opening is a reference value that defines the upper or lower limit of the valve's normal operating range. The comparison can be performed directly using an analog comparator, for example, comparing the opening analog signal with a fixed reference voltage. A fault indication signal is obtained and output; this signal directly reflects the comparison result and indicates whether the valve opening exceeds the safe range. The signal can be a digital signal (such as high / low level) used to drive indicator lights, buzzers, or sent to a host computer system; or it can be a communication protocol message sent to a DCS or PLC system via an industrial bus (such as Modbus, Profibus).

[0063] To address the issue of failing to promptly detect valve opening exceeding a preset over-limit, the valve opening time statistics system of this application introduces a fault detection module based on existing systems. This fault detection module includes a second comparator, whose input pin is directly connected to the output pin of an analog limit switch. The analog limit switch continuously acquires the valve opening analog signal and transmits it to the second comparator. Upon receiving the opening analog signal, the second comparator compares it in real-time with a preset over-limit opening threshold. This preset over-limit opening threshold represents the boundary of the valve's normal operating range. For example, when the valve is fully open or fully closed, its opening signal should be within a specific range; exceeding this range may indicate abnormalities such as valve jamming, actuator malfunction, or installation deviation. Once the opening analog signal exceeds this preset over-limit opening threshold, the second comparator immediately generates a fault indication signal. This fault indication signal is then output and can be used to trigger an alarm, record an event, or notify the control system to take further action. In this way, the system can not only track valve opening and closing times but also monitor abnormal valve opening conditions in real time. This allows for timely detection and early warning in case of mechanical failures or operational anomalies, preventing potential production accidents or equipment damage. This differs from the first comparator, which primarily converts analog opening signals into open / closed status signals for use by the trigger module 104. The second comparator focuses on detecting whether the opening exceeds safety limits. Together, they enhance the comprehensiveness and reliability of valve status monitoring.

[0064] Through the above technical solution, the valve opening and closing time statistics system of this application can effectively solve the problem that the valve opening degree exceeds the preset limit fault in the prior art while statistically analyzing the valve opening and closing time. This enables operators to discover and deal with potential problems in advance, avoid production interruption or equipment damage caused by abnormal valve opening, significantly improve the reliability and safety of valve operation, and ensure the stable operation of the production process.

[0065] In some of the solutions described above in this application, a limit switch 102 is proposed to collect the opening and closing status of the valve. However, when using an analog limit switch, an additional comparator is required to process the analog signal, which increases the complexity and cost of the system.

[0066] In one embodiment of this disclosure, the limit switch 102 is a digital limit switch used to acquire the valve's switching digital signal and transmit the switching digital signal to the first input pin of the trigger module 104.

[0067] Specifically, a digital limit switch is a sensor capable of detecting mechanical motion or object position and directly outputting discrete switching signals (e.g., high or low level, on or off). It does not output continuously changing analog signals but directly provides digital status information. As one implementation, this digital limit switch can be a mechanical limit switch, outputting a switching signal through the closing or opening of contacts; its function is to directly acquire discrete status information of the valve in the fully open or fully closed position. The acquired digital switching signal is transmitted through its output pin to the first input pin of the trigger module 104. Its function is to transmit the acquired valve switching status information to the trigger module 104 so that the trigger module 104 can perform subsequent processing based on this information. This transmission can be achieved by directly connecting the output terminal of the digital limit switch to the first input pin of the trigger module 104 with a wire, or by sending the digital signal to the trigger module 104 through a bus interface (such as Modbus RTU, if the digital limit switch integrates communication functionality).

[0068] This application employs a digital limit switch to directly detect the physical position of the valve. When the valve reaches a preset open or closed position, a clear digital switch signal is immediately generated. This digital signal does not require analog-to-analog conversion or comparison processing; it is directly transmitted to the first input pin of the trigger module 104 through its output pin. The trigger module 104 simultaneously receives valve opening / closing commands from the valve command input terminal. When the trigger module 104 receives the digital switch signal and the valve opening / closing command, it can determine whether the valve has started or stopped its operation according to preset logic and accordingly trigger the start or stop of the timing module 106. Through the above technical solution, the use of a digital limit switch to directly acquire the valve's opening / closing digital signal simplifies the hardware structure of the valve opening / closing time statistics system, reduces the number of required electronic components, and thus reduces the system's manufacturing and maintenance costs. Due to the shortened signal path and reduced processing steps, the real-time performance and accuracy of signal transmission are improved, reducing signal delay and potential errors. This makes the statistics of valve opening / closing time more accurate and reliable, thereby precisely controlling the start and stop of the timing module 106, ensuring accurate recording of valve action time, and providing reliable data support for timely detection of abnormal valve actions.

[0069] In some of the solutions mentioned above in this application, a digital switch is proposed to collect the on / off signals of the valve. However, in this process, both open and closed digital signals may be collected simultaneously, which may lead to valve status conflicts that cannot be detected in time, thereby causing potential fault risks.

[0070] In one embodiment of this disclosure, the limit switch 102 may specifically be a digital limit switch for acquiring the valve's switching digital signal and transmitting the switching digital signal to the first input pin of the trigger module 104.

[0071] To address the issue that a digital switch may simultaneously acquire both on and off digital signals, the switching time statistics system of this application also includes a fault detection module, which includes a third comparator.

[0072] The fault detection module is a functional unit specifically designed to monitor the system's operating status, identify abnormal situations, and issue alarms or take corresponding measures. This module plays a crucial safety role in the entire valve switching time statistics system, responsible for real-time monitoring of valve switching status signals to detect potential conflicts or anomalies. The third comparator is a circuit or logic unit used to compare two or more input signals and output a corresponding signal based on the comparison result. In this solution, the third comparator is specifically used to identify whether there is a conflict between the simultaneous acquisition of the on and off digital signals output by the digital limit switch. The input pins of the third comparator are connected to the output pins of the digital limit switch, establishing a signal path so that the third comparator can directly receive the original switching status digital signals generated by the digital limit switch. This connection can take various forms, such as direct connection via physical wires to ensure low-latency signal transmission; or connection via a bus interface for more flexible system integration and data transmission. Its function is to ensure that the third comparator can acquire the valve's switching digital signals in real time and accurately, providing a reliable data source for subsequent fault identification. The core logic of fault detection is identifying whether both open and closed digital signals are simultaneously acquired. This involves logically judging the received switch signals to detect logically contradictory states, meaning the valve cannot physically be in both open and closed positions at the same time. At the hardware level, this can be implemented using logic circuits such as AND or OR gates, outputting a high level when both conflicting signals are true. Obtaining and outputting a fault indication signal means that when a valve state conflict is detected, the system generates a signal indicating a fault and sends it to other systems or users. This fault indication signal can be output in various ways, with the aim of promptly notifying the system or operators of a fault so that corrective measures can be taken to avoid potential risks caused by misjudging the valve state.

[0073] In addition, to prevent the timing module 106 from continuing to operate in a faulty state, the fault indication signal can also be used to pause or reset the timing module 106.

[0074] Through the above technical solution, this application effectively solves the valve status conflict problem caused by the simultaneous acquisition of open and closed digital signals by the limit switch during valve opening and closing time statistics. By adding a fault detection module and a third comparator, the system can monitor and identify this logical contradiction in real time and output a fault warning signal in a timely manner. This avoids inaccurate timing or system misjudgment caused by erroneous or inconsistent valve status information, thereby significantly improving the reliability and accuracy of valve opening and closing time statistics. At the same time, timely detection and warning of potential valve or sensor faults helps operators quickly locate problems and perform maintenance, reducing the risk of production interruption and equipment damage, and ensuring the continuity and safety of industrial production processes.

[0075] In some of the solutions described above in this application, a timing module 106 is proposed to count the opening and closing time of the valve. However, in this process, the timing module 106 may be affected by the system scanning cycle, resulting in insufficient timing accuracy.

[0076] In one embodiment of this disclosure, the timing module 106 includes a timer or accumulator unit. A timer is a device or functional module used to measure time intervals. An accumulator unit is a functional module used to indirectly measure time by accumulating counts; it typically includes a counter and a conversion mechanism to convert the counts into actual time. A multiplication unit is a functional module used to perform multiplication operations. In time statistics, it multiplies the accumulator's count value by a time unit (such as a system scan cycle), thereby converting the count into an actual amount of time. The accumulator's output pin is connected to the first input pin of the multiplication unit, ensuring that the count value generated by the accumulator can be directly and in real-time transmitted to the multiplication unit as an operand in the multiplication operation. The multiplication unit's second input pin is connected to the system scan cycle output, allowing the multiplication unit to obtain the accurate value of the system scan cycle as another operand in the multiplication operation. The system scan cycle output provides the scan cycle information of the current control system (such as DCS, PLC, SIS), which is the time required for the system to execute one complete program loop. It can be a fixed constant value, determined by the system configuration; or it can be a dynamic value, measured and output by the system in real time.

[0077] Through the above technical solution, this approach can eliminate or significantly reduce timing errors caused by fluctuations in the system scanning cycle or fixed scanning intervals. This makes the statistical results of valve opening and closing times more accurate and reliable, thereby enabling a more precise assessment of valve performance, timely detection of potential problems such as valve jamming and slow operation, and providing data support for early maintenance and fault diagnosis, ultimately ensuring the stability and safety of the production process.

[0078] In traditional, existing valve switching time statistics systems, when collecting valve switching commands, the command signal may be interfered with or unstable, causing the timing module 106 to be falsely triggered to start or stop, thus affecting the accuracy of switching time statistics.

[0079] In one embodiment of this disclosure, the application further proposes that the switching time statistics system also includes a delay unit for signal delay transmission; the input pin of the delay unit is connected to the command input terminal of the valve, and the output pin of the delay unit is connected to the second input pin of the trigger module 104.

[0080] The delay unit is a circuit or module specifically designed to introduce a preset time delay in the signal transmission path. Its core function is to perform time-delay processing on the input signal to stabilize the signal and filter out transient interference. The signal delay transmission refers to outputting or transmitting the received signal after a certain delay, thereby ensuring signal stability. The delay unit can be implemented in various ways. For example, it can be based on the time constant effect of an RC circuit, obtaining the required delay time by appropriately configuring the parameters of the resistors and capacitors; or, in more complex applications, it can be programmed using a microcontroller or programmable logic device (such as an FPGA) to precisely control the signal delay through software delay loops or hardware timers.

[0081] In the aforementioned switching time statistics system, the switching command signal issued by the valve's command input terminal is first transmitted to the input pin of the delay unit. Upon receiving the command signal, the delay unit does not immediately forward it but instead performs a preset time delay processing. During this delay period, any brief noise, transient jitter, or unstable signal changes are effectively filtered or smoothed by the delay unit.

[0082] Through the above technical solution, this application effectively solves the problem of false triggering of the timing module 106 due to interference or instability of the command signal in traditional solutions. By introducing a delay unit between the valve command input terminal and the trigger module 104, the command signal is delayed and filtered for a preset time, ensuring that only stable and continuous command signals can trigger the start or stop of the timing module 106. This significantly improves the accuracy and reliability of valve opening and closing time statistics, avoids false timing caused by unstable command signals, and thus provides more accurate data support for valve status monitoring.

[0083] like Figure 3 As shown, in one embodiment of this disclosure, this application proposes a switching system, including: a valve 302 and the valve switching time statistics system 304 described above.

[0084] The valve 302 is a mechanical device used to control the flow, pressure, and temperature of fluid media in pipelines or equipment. In one specific embodiment, the valve 302 can be a common industrial valve type such as a ball valve, gate valve, globe valve, or butterfly valve. In another embodiment, the valve 302 can be a valve classified according to its actuation method, such as an electric valve, pneumatic valve, or hydraulic valve. As the main actuator for switching actions, the valve 302's state changes are a core object that needs to be monitored and statistically analyzed. The valve switching time statistics system 304 is a device used to measure and record the time required for the valve to transition from one switching state to another. The valve switching time statistics system 304 is responsible for collecting valve status and command signals, and performing timing, triggering, and resetting operations to obtain valve switching time data.

[0085] The above technical solution directly integrates the valve with its on / off time statistics system, forming a cohesive on / off system. This effectively solves the problems of insufficient integration and convenience when deploying independent statistics systems at the system level. By making the valve's on / off time statistics system an integral part of the valve's operating environment, the system achieves enhanced real-time data acquisition and processing capabilities, enabling more immediate and accurate understanding of the valve's operating status. This facilitates proactive maintenance, prevents potential production interruptions, and improves overall production efficiency. Furthermore, this integrated design simplifies the installation process, reduces wiring complexity, and improves the reliability and maintainability of the entire system, directly enhancing application efficiency.

[0086] as follows Figure 4 As shown, in one embodiment of this disclosure, the valve switching time statistics system includes an analog limit switch and a timing module 106, a trigger module 104, a first comparator, a fault detection module, and a delay unit; The input pin of the analog limit switch is connected to the valve to acquire the analog signal of the valve opening. The first comparator contains two sets of "subtraction units (SUB) + logic comparators": Group 1: Analog limit switch output - opening degree 95 setting value → SUB → ≥0 comparator (output open status signal); Group 2: Analog limit switch output - opening degree 5 set value → SUB → ≤0 comparator (output off state signal); The second comparator contains two sets of "subtraction units (SUB) + logic comparators": Group 3: Analog limit switch output -100→SUB→>0 comparator (result inverted); Group 4: Analog limit switch output -0→SUB→<0 comparator (result inverted); Fault detection module: The inverted signals of groups 3 and 4 are transmitted through the OR unit to output "feedback signal fault" to the trigger module 104.

[0087] Trigger module 104 includes valve opening trigger unit 1041 and valve closing trigger unit 1042; The first input pin of the valve opening trigger unit 1041 is connected to the output pin of group 1, and the second input pin is connected to the output terminal of the delay unit. The input terminal of the delay unit is connected to the AND gate, and the input terminal of the AND gate is connected to the output terminal of the valve command and fault detection module. The first input pin of the valve closing trigger unit 1042 is connected to the output pin of group 2, and the second input pin is connected to the output terminal of the delay unit. The input terminal of the delay unit is connected to an AND gate, and the input terminal of the AND gate is connected to the NOT gate of the valve command and the output terminal of the fault detection module. The timing module 106 includes a valve opening timing unit 1061 (timer 01) and a valve closing timing unit 1062 (timer 02), both of which are of type TMR_R. The valve opening trigger unit 1041 can be an RS flip-flop (RS block in the figure). Its output pin is Q terminal connected to the input pin of timer 01, i.e., the IN pin. At the same time, the output pin of RS flip-flop 01 is connected to the RESET pin of timer 02, i.e., the reset pin. The valve closing trigger unit 1042 is an RS flip-flop 02. Its output pin, Q, is connected to the input pin, IN pin, of timer 02. At the same time, the output pin of RS flip-flop 02 is connected to the RESET pin, i.e., the reset pin, of timer 01. RS block, MRS flip-flop, S is the set input, R is the reset input, set takes precedence; see Table 1 below for specific output details:

[0088] The ET values ​​of timers 01 and 02 are the timing output pins. The ET value of timer 01 is the valve opening time, and the ET value of timer 02 is the valve closing time.

[0089] In practical applications, valve commands (1 for open, 0 for closed) are output from the host DCS or PLC system to the field valve actuator to control the solenoid valve. 1 indicates a 24VDC energized output signal, and 0 indicates a de-energized signal. When the output is 1, the field solenoid valve is energized, the control air path is open, the valve cylinder is filled with air, the internal piston plate drives the rotating shaft to rotate, which in turn moves the valve plate inside the valve body, opening the valve. When the output is 0, the field solenoid valve is de-energized, the control air path is disconnected, the internal piston plate of the valve cylinder is reset by the back spring, driving the rotating shaft to rotate, which in turn moves the valve plate inside the valve body, closing the valve.

[0090] The timer is active when the IN pin input is 1, starting the count from 0; PT is the preset full-scale range, for example, when the count reaches or exceeds 500 seconds, the ET output will only display 500 seconds; when the RESET pin input is 1, the current count time is reset to 0; the ET pin outputs the current count time for display purposes. Valve opening time calculation: During valve opening, timer 01 keeps track of the time. Once the valve is fully opened, the timer stops. The valve opening time can be displayed through the DCS or PLC system for operators to monitor. When the valve is closed, the valve opening time will automatically reset to 0. Valve closing time calculation: During valve closing, timer 02 keeps time. After the valve is fully opened, the timer stops. The valve closing time can be displayed through the DCS system or PLC system for operators to monitor. When the valve is opened, the valve closing time will automatically reset to 0. Feedback signal failure: When an analog limit switch malfunctions, such as a signal exceeding the 4-20MADC (corresponding to 0-100%) range, a broken physical transmission line, or a sensor circuit failure, the feedback signal failure can be displayed through the DCS or PLC system for operator monitoring. Simultaneously, the feedback signal failure has an interlocking function; when a feedback signal failure exists, the valve's opening and closing commands are invalid, and valve action time cannot be recorded. In other words, the absence of a feedback signal failure is a condition that allows valve action timing.

[0091] according to Figure 4During normal operation, when the valve is in the closed position, the analog limit switch detects the closed position and outputs a 4MADC signal to the DCS or PLC system to indicate that the valve is closed. When the operator outputs a valve opening command signal (only for 3 seconds) through the DCS or PLC system, it acts on the S pin of the MRS trigger 01. The Q pin of the MRS trigger 01 outputs a signal of 1, which is then transmitted to the IN pin of the TMR_R timer 01. The ET pin of the TMR_R timer 01 continuously increases, and the valve opening time begins to count down. When the valve opening degree is greater than or equal to 95, it is compared with the set value of 95. If it is greater than or equal to 0, an output of 1 is sent to pin R of MRS trigger 01, resetting the output signal of the Q pin of the MRS trigger to 0. This signal is then transmitted to the IN pin of TMR_R timer 01, changing the IN pin state from 1 to 0. The output of the ET pin stops increasing, and the valve opening time stops counting. This valve opening time is the actual valve opening action time. It can be displayed intuitively on the operator station screen through the DCS or PLC system. An alarm can be set for the valve opening time, and a process alarm will pop up after a certain time to remind the operator. At the same time, when the valve begins to close, the valve closing signal is introduced to the RESET pin of TMR_R timer 01, resetting the output of the ET pin of TMR_R timer 01 to 0, and the valve opening time becomes 0. During normal operation, when the valve is in the fully open position, the analog limit switch detects the open position and outputs a 20MADC signal to the DCS or PLC system, indicating that the valve is fully open. When the operator outputs a valve closing command signal (only for 3 seconds) through the DCS or PLC system, it acts on the S pin of the MRS trigger 02. The Q pin of the MRS trigger 02 outputs a signal of 1, which is then transmitted to the IN pin of the TMR_R timer 02. The ET pin of the TMR_R timer 02 continuously increases, and the valve closing time begins to count down. When the valve opening is less than or equal to 5, it is compared with the set value of 5. If it is less than or equal to 0, an output of 1 is sent to pin R of MRS trigger 02, resetting the Q pin output signal of the MRS trigger to 0. This signal is then transmitted to the IN pin of TMR_R timer 02, changing the IN pin state from 1 to 0. The ET pin output stops increasing, and the valve closing time stops counting. This valve closing time is the actual valve closing action time. This can be displayed intuitively on the operator's station screen through the DCS or PLC system. An alarm can be set for the valve closing time; if a certain time is exceeded, a process alarm will pop up to remind the operator. Simultaneously, when the valve begins to open, the valve opening signal is introduced to the RESET pin of TMR_R timer 02, resetting the ET pin output of TMR_R timer 02 to 0, and the valve closing time becomes 0.

[0092] as follows Figure 5As shown, in one embodiment of this disclosure, the valve switching time statistics system includes a switching quantity limit switch and a timing module 106, a triggering module 104, a first comparator, a fault detection module, and a third comparator; Limit switch 102: The input pin of the switch is connected to the valve, collects the digital signal of the switch, and directly transmits it to the first input pin of the trigger module 104; Fault detection module: The output pins of the digital limit switch output "on digital signal" and "off digital signal". The on digital signal is inverted by the input pin of the third comparator. The off digital signal is inverted by the input pin of the third comparator, then by the first AND unit, then by the DON unit (10-second delay), and finally input to the third AND unit. The output pins of the digital limit switch output "on digital signal" and "off digital signal". The "on digital signal" and "off digital signal" are inverted by the second AND unit and finally input to the third AND gate. Trigger module 104 includes valve opening trigger unit 1041 and valve closing trigger unit 1042; The first input pin of the valve opening trigger unit 1041 is connected to the inverted signal of the "open digital signal", and the second input pin is connected to the output of the fourth AND unit. The input of the fourth AND unit is the output of the third AND unit of the valve command and fault detection module. The first input of the valve closing trigger unit 1042 is connected to the inverted signal of the "closing digital signal", and the second input pin is connected to the output of the fifth AND unit. The input of the fifth AND unit is the output of the third AND unit of the valve command and fault detection module. Among them, the valve opening trigger unit 1041 and the valve closing trigger unit 1042 can be AND gates.

[0093] The timing module 106 includes a valve opening timing unit 1061 (timer 01) and a valve closing timing unit 1062 (timer 02), both of which are of type TMR_R. The valve opening trigger unit 1041 can be an RS flip-flop, and its output pin Q is connected to the input pin IN of timer 01. At the same time, the output pin of RS flip-flop 01 is connected to the RESET pin of timer 02. The valve closing trigger unit 1042 is an RS flip-flop 02. Its output pin, Q, is connected to the input pin, IN pin, of timer 02. At the same time, the output pin of RS flip-flop 02 is connected to the RESET pin, i.e., the reset pin, of timer 01. The ET values ​​of timers 01 and 02 are the timing output pins. The ET value of timer 01 is the valve opening time, and the ET value of timer 02 is the valve closing time.

[0094] In practical applications, valve commands (1 for open, 0 for closed) are output from the host DCS or PLC system to the field valve actuator to control the solenoid valve. 1 indicates a 24VDC energized output signal, and 0 indicates a de-energized signal. When the output is 1, the field solenoid valve is energized, the control air path is open, the valve cylinder is filled with air, the internal piston plate drives the rotating shaft to rotate, which in turn moves the valve plate inside the valve body, opening the valve. When the output is 0, the field solenoid valve is de-energized, the control air path is disconnected, the internal piston plate of the valve cylinder is reset by the back spring, driving the rotating shaft to rotate, which in turn moves the valve plate inside the valve body, closing the valve.

[0095] Valve opening time calculation: During valve opening, timer 01 keeps track of the time. Once the valve is fully opened, the timer stops. The valve opening time can be displayed through the DCS or PLC system for operators to monitor. When the valve is closed, the valve opening time will automatically reset to 0. Valve closing time calculation: During valve closing, timer 02 keeps time. After the valve is fully opened, the timer stops. The valve closing time can be displayed through the DCS system or PLC system for operators to monitor. When the valve is opened, the valve closing time will automatically reset to 0. Feedback signal failure occurs when both the open and close positions of the switching input are present or absent. This indicates a feedback signal failure, which can be caused by factors such as a short circuit in the physical transmission line, a broken physical transmission line, or a sensor circuit malfunction. Feedback signal failures can be displayed through the DCS or PLC system for operator monitoring. The reason for adding a 10-second delay (the time can be freely set) when there is no feedback is that the switching input is absent during the valve's opening or closing process; the delay ensures smooth program execution during normal operation. Furthermore, feedback signal failure has an interlocking effect. When a feedback signal failure exists, the valve's open and close commands are invalid, and valve action time cannot be recorded. In other words, the absence of a feedback signal failure is a condition that allows valve action timing.

[0096] according to Figure 5During normal operation, when the valve is in the closed position, the switch detects the closed position and outputs a feedback signal to the DCS or PLC system, indicating that the valve is closed. When the operator outputs a valve opening command signal (only for 3 seconds) through the DCS or PLC system, it acts on the S pin of MRS trigger 01. The Q pin of MRS trigger 01 outputs a signal of 1, which is then transmitted to the IN pin of TMR_R timer 01. The ET pin of TMR_R timer 01 continuously increases, and the valve opening timer starts counting down. When the valve is fully opened, the actual opening feedback output is 1 to the R pin of MRS trigger 01, resetting the Q pin of the MRS trigger to 0, which is then transmitted to the IN pin of TMR_R timer 01. The IN pin changes from 1 to 0, the ET pin output stops increasing, and the valve opening timer stops counting down. This valve opening time is the actual valve opening action time. This can be displayed intuitively on the operator's screen through the DCS or PLC system. An alarm can be set for the valve opening time; if a certain time is exceeded, a process alarm will pop up to remind the operator. At the same time, when the valve begins to close, the valve closing signal is introduced into the RESET pin of TMR_R timer 01, resetting the ET pin output of TMR_R timer 01 to 0, and the valve opening time becomes 0; During normal operation, when the valve is fully open, the switch detects the open position and outputs an open feedback signal to the DCS or PLC system, indicating that the valve is open. When the operator outputs a valve closing command signal (only for 3 seconds) through the DCS or PLC system, it acts on the S pin of MRS trigger 02. The Q pin of MRS trigger 02 outputs a signal of 1, which is then transmitted to the IN pin of TMR_R timer 02. The ET pin of TMR_R timer 02 continuously increases, and the valve closing time begins to count down. When the valve closing feedback signal outputs 1 to the R pin of MRS trigger 02, the Q pin of the MRS trigger is reset to 0, which is then transmitted to the IN pin of TMR_R timer 02. The IN pin changes from 1 to 0, the ET pin output stops increasing, and the valve closing time stops counting down. This valve closing time is the actual valve closing action time. This can be displayed intuitively on the operator's screen through the DCS or PLC system. An alarm can be set for the valve closing time; if a certain time is exceeded, a process alarm will pop up to remind the operator. At the same time, when the valve starts to open, the valve opening signal is introduced into the RESET pin of TMR_R timer 02, resetting the ET pin output of TMR_R timer 02 to 0, and the valve closing time becomes 0.

[0097] as follows Figure 6As shown, in one embodiment of this disclosure, the valve switching time statistics system includes an analog limit switch 102, a trigger module 104, a timing module 106 (accumulator unit), a first comparator, a fault detection module, and a delay unit.

[0098] The system, in addition to the trigger module 104 and the timing module 106, is the same as described above. Figure 4 The disclosed embodiments differ slightly, but are otherwise identical. This application will not elaborate on these differences here; please refer to [link to relevant documentation]. Figure 4 Disclosed embodiments.

[0099] The timing module 106 (accumulator unit) includes the valve opening timing unit 1061 (accumulator 01 + multiplication unit) and the valve closing timing unit 1062 (accumulator 02 + multiplication unit). The output pin of the valve opening trigger unit 1041 is connected to the IN pin of accumulator 01 (to start accumulation, with the initial value of PT being 0), and also to the RESET pin of accumulator 02; The output pin of the valve closing trigger unit 1042 is connected to the IN pin of the accumulator 02 (to start accumulation, with the initial value of PT being 0), and is also connected to the RESET pin of the accumulator 01. The valve opening trigger unit 1041 and the valve closing trigger unit 1042 are both AND gates. The valve opening trigger unit 1041 and the valve closing trigger unit 1042 are connected to one side of the analog limit switch to obtain the inverted signal. Accumulator 01's ET (real-time accumulated value) × system scan cycle time (multiplication unit) → valve opening time; Accumulator 02's ET× system scan cycle time → valve closing time.

[0100] In practical applications, valve opening time is calculated as follows: During valve opening, accumulator 01 counts, and the counting stops once the valve is fully opened. The count value multiplied by the system scan cycle is the valve opening time, which can be displayed through a DCS or PLC system for operator monitoring. When the valve is closed, accumulator 01 is automatically reset, and the valve opening time display is 0. Valve closing time calculation: During valve closing, accumulator 02 counts, and the counting stops when the valve is fully closed. The count value multiplied by the system scan cycle is the valve closing time, which can be displayed through a DCS or PLC system for operator monitoring. When the valve is opened, accumulator 02 will automatically reset, and the valve closing time display will be 0. Feedback signal failure: When an analog limit switch malfunctions, such as a signal exceeding the 4-20MADC (corresponding to 0-100%) range, a physical transmission line break, or a sensor circuit failure, the feedback signal failure can be displayed through the DCS or PLC system for operator monitoring. Simultaneously, the feedback signal failure has an interlocking function; when a feedback signal failure exists, the valve's opening and closing commands are invalid, and valve action time cannot be recorded. In other words, the absence of a feedback signal failure is a condition that allows valve action timing.

[0101] according to Figure 5 During normal operation, when the valve is in the closed position, the analog limit switch detects the closed position and outputs a 4MADC signal to the DCS or PLC system to indicate that the valve is closed. When the control operator outputs a valve opening command signal (output is 1) through the DCS or PLC system, the current analog feedback that the set value has not been reached is inverted to 1, and both are input into the AND block (two inputs are ANDed), and then the output is 1, which is transmitted to the IN pin of INC_R accumulator 01. The output of the ET pin of INC_R accumulator 01 continues to increase, multiplied by the system scan cycle time, to output the valve opening time and start timing. When the valve opening degree is greater than or equal to 95, it is compared with the set value of 95. If it is greater than or equal to 0, the output 1 is inverted and input to the AND block. The AND block output is 0, which is transmitted to the IN pin of INC_R timer 01. The IN pin state changes from 1 to 0, the ET pin output stops increasing, and the valve opening time stops counting. The valve opening time at this time is the actual valve opening action time. It can be displayed intuitively on the operator station screen through the DCS system or PLC system screen. An alarm can be set for the valve opening time. After a certain time is exceeded, a process alarm will pop up to remind the operator. At the same time, when the valve begins to close, the valve closing signal is introduced to the RESET pin of INC_R timer 01, resetting the ET pin output of INC_R timer 01 to 0, the count to 0, and the valve opening time becomes 0. During normal operation, when the valve is in the fully open position, the analog limit switch detects the fully open position and outputs a 20MADC signal to the DCS or PLC system, indicating that the valve is fully open. When the control operator outputs a valve closing command signal (output is 0) through the DCS or PLC system, the current analog feedback that the set value has not been reached is inverted to 1, and both are input into the AND block (two inputs are ANDed), and then the output is 1, which is transmitted to the IN pin of INC_R accumulator 02. The output of the ET pin of INC_R accumulator 02 continues to increase, multiplied by the system scan cycle time, to output the valve closing time and start the timing. When the valve opening reaches 5, it is compared with the set value of 5. If it is less than or equal to 0, the output 1 is inverted and input to the AND block. The AND block output is 0, which is then transmitted to the IN pin of INC_R timer 02. The IN pin state changes from 1 to 0, the ET pin output stops incrementing, and the valve closing time stops counting. This valve closing time is the actual valve closing action time. It can be displayed intuitively on the operator station screen through the DCS or PLC system. An alarm can be set for the valve closing time; if a certain time is exceeded, a process alarm will pop up to remind the operator. Simultaneously, when the valve begins to open, the valve opening signal is introduced to the RESET pin of INC_R timer 02, resetting the ET pin output of INC_R timer 02 to 0, the count to 0, and the valve closing time to 0.

[0102] as follows Figure 7 As shown, in one embodiment of this disclosure, the valve switching time statistics system includes: a switching quantity limit switch, a trigger module 104, a timing module 106 (accumulator unit), a fault detection module, and a delay unit.

[0103] The system, in addition to the trigger module 104 and the timing module 106, is the same as described above. Figure 5 The disclosed embodiments differ slightly, but are otherwise identical. This application will not elaborate on these differences here; please refer to [link to relevant documentation]. Figure 5 Disclosed embodiments.

[0104] The timing module 106 (accumulator unit) includes the valve opening timing unit 1061 (accumulator 01 + multiplication unit) and the valve closing timing unit 1062 (accumulator 02 + multiplication unit). The output pin of the valve opening trigger unit 1041 is connected to the IN pin of accumulator 01 (start accumulation, PT=0), and also to the RESET pin of accumulator 02; The output pin of the valve closing trigger unit 1042 is connected to the IN pin of the accumulator 02 (start accumulation, PT=0), and also to the RESET pin of the accumulator 01. The valve opening trigger unit 1041 and the valve closing trigger unit 1042 are both AND gates. The valve opening trigger unit 1041 and the valve closing trigger unit 1042 are connected to one side of the pin of the switch to obtain the inverted signal. Accumulator 01's ET × system scan cycle time → valve opening time; Accumulator 02's ET× system scan cycle time → valve closing time.

[0105] In practical applications: Valve opening time calculation: During valve opening, accumulator 01 counts, and the counting stops when the valve is fully opened. The count value multiplied by the system scan cycle is the valve opening time, which can be displayed through a DCS or PLC system for operator monitoring; when the valve is closed, accumulator 01 is automatically reset, and the valve opening time display is 0. Valve closing time calculation: During valve closing, accumulator 02 counts, and the counting stops when the valve is fully closed. The count value multiplied by the system scan cycle is the valve closing time, which can be displayed through a DCS or PLC system for operator monitoring. When the valve is opened, accumulator 02 will automatically reset, and the valve closing time display will be 0. Feedback signal failure occurs when both the open and close positions of the switching input are present or absent. This indicates a feedback signal failure, which can be caused by factors such as a short circuit in the physical transmission line, a broken physical transmission line, or a sensor circuit malfunction. Feedback signal failures can be displayed through the DCS or PLC system for operator monitoring. The reason for adding a 10-second delay (the time can be freely set) when there is no feedback is that the switching input is absent during the valve's opening or closing process; the delay ensures smooth program execution during normal operation. Furthermore, feedback signal failure has an interlocking effect. When a feedback signal failure exists, the valve's open and close commands are invalid, and valve action time cannot be recorded. In other words, the absence of a feedback signal failure is a condition that allows valve action timing.

[0106] according to Figure 7During normal operation, when the valve is in the closed position, the switch detects the closed position and outputs a feedback signal to the DCS or PLC system, indicating that the valve is closed. When the operator outputs a valve opening command signal (output is 1) through the DCS or PLC system, the current feedback signal (0 is inverted to 1) is input to the AND block (two inputs are ANDed), and the output becomes 1, which is then sent to the IN pin of INC_R accumulator 01. The ET pin output of INC_R accumulator 01 continuously increases, multiplied by the system scan cycle time, to output the valve opening time and start timing. When the valve opening feedback is complete, the output 1 is inverted and input to the AND block, the AND block output becomes 0, and the output is sent to the IN pin of INC_R timer 01. The IN pin state changes from 1 to 0, the ET pin output stops increasing, and the valve opening time stops timing. This valve opening time is the actual valve opening action time, which can be displayed intuitively on the operator's screen through the DCS or PLC system. An alarm can be set for the valve opening time; if a certain time is exceeded, a process alarm will pop up to remind the operator. At the same time, when the valve begins to close, the valve closing signal is introduced into the RESET pin of INC_R timer 01, resetting the ET pin output of INC_R timer 01 to 0, the count to 0, and the valve opening time to 0. During normal operation, when the valve is fully open, the switch detects the open position and outputs an open feedback signal to the DCS or PLC system, indicating that the valve is open. When the operator outputs a valve closing command signal (output is 0) through the DCS or PLC system, the current feedback signal (no fault) is inverted to 1, and both are input to the AND block (two inputs are ANDed), then the output becomes 1, which is transmitted to the IN pin of INC_R accumulator 02. The ET pin output of INC_R accumulator 02 continuously increases, multiplied by the system scan cycle time, to output the valve closing time and start timing. When the valve closing feedback is complete, the output 1 is inverted and input to the AND block, the AND block output becomes 0, and the output is transmitted to the IN pin of INC_R timer 02. The IN pin state changes from 1 to 0, the ET pin output stops increasing, and the valve closing time stops timing. The valve closing time at this point is the actual valve closing action time, which can be displayed intuitively on the operator's screen through the DCS or PLC system. An alarm can be set for the valve closing time; if a certain time is exceeded, a process alarm will pop up to remind the operator. At the same time, when the valve begins to open, the valve opening signal is introduced to the RESET pin of INC_R timer 02, resetting the ET pin output of INC_R timer 02 to 0, the count to 0, and the valve closing time to 0.

[0107] Table 2. Instructions for Switching Times

[0108] In practical applications, the valves used in the aforementioned important sections and occasions have their valve action times statistically analyzed, forming the above data table. When the action time of this type of on / off valve is too long, exceeding the data in the table, an alarm can be triggered, the cause can be analyzed, and solutions can be found for different fault problems.

[0109] The time statistics system, which includes a limit switch 102, a trigger module 104, and a timing module 106, collects valve status and commands, triggers the start or stop of the timing module 106, and thus counts the valve opening and closing time. It has the advantages of being able to quantify the time required for valve opening and closing actions in real time, facilitating early detection of potential faults, and improving production safety and equipment reliability.

[0110] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0111] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0112] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A valve opening and closing time statistics system, characterized in that, include: Limit switches, trigger modules, and timing modules; The input pin of the limit switch is connected to the valve to collect the opening and closing status of the valve, and the output pin of the limit switch is connected to the first input pin of the trigger module. The second input pin of the trigger module is connected to the command input terminal of the valve for acquiring valve opening and closing commands. The output pin of the trigger module is connected to the input pin of the timing module for triggering the start or stop of the timing module.

2. The valve opening and closing time statistics system according to claim 1, characterized in that, The triggering module includes a valve opening triggering unit and a valve closing triggering unit, and the timing module includes a valve opening timing unit and a valve closing timing unit; The first input pins of the valve opening trigger unit and the valve closing trigger unit are respectively connected to the output pins of the limit switch, and the second input pins of the valve opening trigger unit and the valve closing trigger unit are respectively connected to the command input terminal of the valve. The output pin of the valve opening trigger unit is connected to the input pin of the valve opening timing unit, and the output pin of the valve closing trigger unit is connected to the input pin of the valve closing timing unit.

3. The valve opening and closing time statistics system according to claim 2, characterized in that, The valve opening timing unit and the valve closing timing unit also include a reset pin; The output pin of the valve opening trigger unit is also connected to the reset pin of the valve closing timer unit, and the output pin of the valve closing trigger unit is also connected to the reset pin of the valve opening timer unit.

4. The valve opening and closing time statistics system according to any one of claims 1-3, characterized in that, The limit switch is an analog limit switch used to acquire the analog opening signal of the valve; the switching time statistics system also includes a first comparator; The input pin of the first comparator is connected to the output pin of the analog limit switch, and is used to compare the opening analog signal with a preset valve opening threshold to obtain the valve's open state signal or closed state signal, which is then transmitted to the first input pin of the trigger module.

5. The valve opening and closing time statistics system according to claim 4, characterized in that, The switching time statistics system also includes a fault detection module, which includes a second comparator. The input pin of the second comparator is connected to the output pin of the analog limit switch, and is used to compare the opening analog signal with the preset over-limit opening to obtain a fault indication signal and output it.

6. The valve opening and closing time statistics system according to any one of claims 1-3, characterized in that, The limit switch is a digital limit switch used to acquire the switching digital signal of the valve and transmit the switching digital signal to the first input pin of the trigger module.

7. The valve opening and closing time statistics system according to claim 6, characterized in that, The switching time statistics system also includes a fault detection module, which includes a third comparator. The input pin of the third comparator is connected to the output pin of the digital limit switch to identify whether the on and off digital signals are acquired simultaneously, obtain a fault indication signal and output it.

8. The valve opening and closing time statistics system according to any one of claims 1-3, characterized in that, The timing module includes a timer or an accumulator unit; the accumulator unit includes an accumulator and a multiplier unit, the output pin of the accumulator is connected to the first input pin of the multiplier unit, and the second input pin of the multiplier unit is connected to the system scan cycle output terminal.

9. The valve opening and closing time statistics system according to any one of claims 1-3, characterized in that, The switching time statistics system also includes a delay unit for signal delay transmission; The input pin of the delay unit is connected to the command input terminal of the valve, and the output pin of the delay unit is connected to the second input pin of the trigger module.

10. A switching system, characterized in that, include: The valve and the switching time statistics system as described in any one of claims 1-9.

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