CN108061195B - Method for accurately detecting switching speed of high-frequency quick-switching valve in VPSA process - Google Patents

Abstract

The invention discloses a method for accurately detecting the switching speed of a high-frequency quick-switching valve in a VPSA (vacuum pressure swing adsorption) process, which comprises the steps of installing a detection device for opening and closing a valve position on a high-frequency quick-switching valve actuating mechanism; setting a preset time; measuring and judging the transmission time of the valve position signal; after early warning, the speed of the high-frequency quick-switching valve is controlled and adjusted. Through accurate detection and early warning, the fault problems of asynchrony, jamming and limit adjustment of the high-frequency quick-cutting valve are effectively avoided. The high-frequency fast switching valve in the VPSA process is guaranteed to be switched efficiently.

Description

A method for accurate detection of switching speed of high-frequency fast-cut valve in VPSA process

technical field

The invention relates to the technical field of high-frequency quick-cut valves, in particular to a method for accurately detecting the switching speed of a high-frequency quick-cut valve in a VPSA process.

Background technique

High-frequency switching valves for fluid switching in gas pipelines are commonly used in the current VPSA production process. In the prior art, the failure of synchronization, jamming, and limit adjustment of the high-frequency quick-cut valve are multiple failures, which will affect the continuity and reliability of the automatic production of the VPSA system. The main reason for the difficulty to solve the fault is the lack of accurate monitoring and early warning of the speed and time of the quick-cut valve. The main reasons are: the lack of complete and reliable valve position detection device for on-site valves; the inability to warn of equipment abnormalities in advance; the lack of PLC software program design.

At present, only one high-frequency quick-cut valve is designed on the valve position, and there is even no detection element. A valve without a valve position detection element cannot determine the actual position of the valve when it opens and closes. Even if there is one detection element, only one valve position (open position/closed position) can be detected. This makes it impossible to judge intuitively if the valve leaks and the punch is not in place during the production process. The actual position of the on-site valve and the switch signal cannot be entered into the PLC monitoring system, and the actual operating status of the on-site valve cannot be accurately judged, and effective measures cannot be taken in time to prevent the faulty vehicle from stopping, and the opportunity to correct the valve position and position is missed. At the same time, due to the lack of on-site valve position detection components and the lack of in-depth prevention of VPSA process failures, the programmer ignores the detection logic and method of valve action speed in the program design.

In the prior art, due to the lack of accurate monitoring and early warning of the speed and time of the quick-cutting valve, the asynchrony, jamming, and limit adjustment faults of the high-frequency quick-cutting valve are frequent faults. Detecting early warning to avoid these problems The problem to be solved by the present invention.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for accurately detecting the switching speed of a high-frequency fast-cut valve in a VPSA process. It is used to avoid the problems of asynchrony, jamming, and limit adjustment failure of the existing high-frequency quick-cut valve.

In order to achieve the above object, the technical solution of the present invention is to provide a method for accurately detecting the switching speed of a high-frequency fast-cut valve in a VPSA process. The steps of the method for accurately detecting the switching speed of the high-frequency quick-cutting valve of the VPSA process include: installing a detection device for opening the valve position and closing the valve position on the high-frequency quick-cutting valve actuator; setting a preset time; measuring and judging the valve position signal the transmission time; control and adjust the speed of the high-frequency quick-cut valve after the early warning.

Step 1: Install the detection device for opening the valve position and closing the valve position on the high-frequency quick-cut valve actuator;

The angle of the high-frequency quick-cut valve opening the valve position is 90 degrees clockwise, and the angle of the high-frequency quick-cutting valve closing the valve position is 90 degrees counterclockwise. An induction iron block is fixed at the end of the part connecting the output shaft of the actuator and the valve stem, and two 24V DC two-wire electromagnetic proximity switches are vertically installed near the output shaft of the actuator shell to open the valve position and close the valve position. detection device. These two position signals make it possible to accurately measure the key components of the valve action speed. When the valve position is opened and closed, the installed detection device will rotate synchronously with the output shaft of the actuator. The break is transmitted to the PLC, and the operator can remotely monitor and master the actual opening and closing of the valve.

Step 2: Set the preset time;

The preset time is set according to the actual VPSA process system. Different VPSA process systems need to set different preset times, and through different preset times, different phenomena of abnormal speed of high-speed fast-cutting valves can be measured. Generally, the larger the high-frequency quick-cut valve, the longer the preset time. The preset time lock setting range is between 700 and 1100 milliseconds.

Step 3: Measure and judge the transmission time of the valve position signal;

The speed of the electrical signal in the line belongs to the speed of light, and the distance from the electromagnetic proximity switch element to the PLC module is not more than 1 km, so the transmission time of the electrical signal round trip in the line is ignored.

When measuring the speed of opening the valve position, the high-frequency quick-cut valve is in the closed position, and the closed valve position feedback switch is in the closed state. When the operator controls the opening of the high-frequency quick-cut valve, the normally open node of the valve position feedback switch in the PLC control program is turned on, and the high-frequency quick-cut valve opening output command is issued. At this time, the valve position opening speed alarm timer starts to accumulate. At the same time, the high-frequency fast-cut valve starts to perform the opening action. During the action, the valve position opening speed alarm timer is accumulated to the preset time, but the high-frequency quick-cut valve is not actually opened in place, that is, the open valve position feedback switch is still in the closed state, and the open valve position timeout alarm switch is triggered. .

If the high-frequency quick-cut valve opening output command is issued, the preset time is reached and the high-frequency quick-cut valve still does not act, that is, the open valve position feedback switch is always in the closed state, and the open valve position timeout alarm switch will also be triggered under this condition. .

When measuring the speed of closing the valve position, the high-frequency quick-cut valve is in the open position, and the open valve position feedback switch is in the closed state. When the operator controls to close the high-frequency quick-cut valve, the normally closed node of the valve position feedback switch in the PLC control program is turned on. The high-frequency quick-cut valve closing output is designated to send out. At this time, the valve position closing speed alarm closing timer starts to accumulate, and the high-frequency quick-cutting valve starts to perform the opening action. During the action, the valve closing speed alarm timer is accumulated to the preset time, but the high-frequency quick-cut valve is not actually opened in place, that is, the closing valve position feedback switch is still in the closed state, then the closing valve position timeout alarm switch is triggered. .

If the high-frequency quick-cut valve close output is specified, the preset time is reached and the high-frequency quick-cut valve still does not act, that is, the closed valve position feedback switch is always in the closed state, and the close valve position timeout alarm switch will also be triggered in this situation. .

Step 4: Control and adjust the high-frequency quick-cut valve after warning;

When the open valve position timeout alarm switch is triggered within the preset time, the computer control terminal will display an alarm message and an alarm sound, indicating that the high-frequency quick-cut valve opens slowly;

When the open valve position timeout alarm switch is triggered outside the preset time, an alarm message and an alarm sound will appear on the computer control terminal, indicating that the high-frequency quick-cut valve is not opened.

When the closing valve position timeout alarm switch is triggered within the preset time, an alarm message and an alarm sound will appear on the computer control terminal, indicating that the high-frequency fast-cut valve closes slowly;

When the closing valve position timeout alarm switch is triggered within the preset time, the computer control terminal will display alarm information and alarm sound, indicating that the high-frequency quick-cut valve is not closed.

The invention has the following advantages: through accurate detection and early warning, the failure problems of asynchronous, jammed and limit adjustment of the high-frequency quick-cut valve are effectively avoided. It ensures the efficient switching of high-frequency quick-cut valves in the VPSA process.

Description of drawings

Fig. 1 is a flow chart of the steps of the present invention.

FIG. 2 is a program control diagram of the present invention.

Detailed ways

The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

The steps of the method for accurately detecting the switching speed of a high-frequency quick-cut valve in a VPSA process according to the present invention include: installing a detection device for opening the valve position and closing the valve position on the high-frequency quick-cut valve actuator; setting a preset time; measure and judge the transmission time of the valve position signal; control and adjust the high-frequency quick-cut valve after early warning.

Example 1

In the actual operation process, an induction iron block is fixed at the end of the part connecting the output shaft of the actuator and the valve stem, and two 24V DC two-wire electromagnetic proximity switches are installed vertically near the output shaft of the actuator shell to open the valve. The detection device of position and closing valve position. After the installation is completed, the preset time should be set according to the actual VPSA process system. Different VPSA process systems should be set with different preset times. Generally, the range of preset time is set between 700 and 1100 milliseconds. between.

When measuring the speed of opening the valve position, the high-frequency quick-cut valve is in the closed position, and the closed valve position feedback switch is in the closed state. When the operator controls the opening of the high-frequency quick-cut valve, the normally open node of the valve position feedback switch in the PLC control program is turned on, and the high-frequency quick-cut valve opening output command is issued. At this time, the valve position opening speed alarm timer starts to accumulate. At the same time, the high-frequency fast-cut valve starts to perform the opening action. During the action, the valve position opening speed alarm timer is accumulated to the preset time, but the high-frequency quick-cut valve is not actually opened in place, that is, the open valve position feedback switch is still in the closed state, and the open valve position timeout alarm switch is triggered. . When the open valve position timeout alarm switch is triggered at the preset time, the computer control terminal will display the alarm information and alarm sound, indicating that the high-frequency fast-cut valve opens slowly.

Example 2

In the actual operation process, an induction iron block is fixed at the end of the part connecting the output shaft of the actuator and the valve stem, and two 24V DC two-wire electromagnetic proximity switches are installed vertically near the output shaft of the actuator shell to open the valve. The detection device of position and closing valve position. After the installation is completed, the preset time should be set according to the actual VPSA process system. Different VPSA process systems should be set with different preset times. Generally, the range of preset time is set between 700 and 1100 milliseconds. between.

When measuring the speed of opening the valve position, the high-frequency quick-cut valve is in the closed position, and the closed valve position feedback switch is in the closed state. When the operator controls the opening of the high-frequency quick-cut valve, the normally open node of the valve position feedback switch in the PLC control program is turned on, and the high-frequency quick-cut valve opening output command is issued. At this time, the valve position opening speed alarm timer starts to accumulate. At the same time, the high-frequency fast-cut valve starts to perform the opening action. In the process of action, the valve position opening speed alarm timer is accumulated to the preset time, and the high-frequency quick-cut valve still does not act, that is, the open valve position feedback switch is always in the closed state. In this case, the valve position timeout alarm switch will also be opened. is triggered. When the open valve position timeout alarm switch is triggered at the preset time, the computer control terminal will display the alarm information and alarm sound, indicating that the high-frequency quick-cut valve is not opened.

Example 3

In the actual operation process, an induction iron block is fixed at the end of the part connecting the output shaft of the actuator and the valve stem, and two 24V DC two-wire electromagnetic proximity switches are installed vertically near the output shaft of the actuator shell to open the valve. The detection device of position and closing valve position. After the installation is completed, the preset time should be set according to the actual VPSA process system. Different VPSA process systems should be set with different preset times. Generally, the range of preset time is set between 700 and 1100 milliseconds. between.

When measuring the speed of closing the valve position, the high-frequency quick-cut valve is in the open position, and the open valve position feedback switch is in the closed state. When the operator controls to close the high-frequency quick-cut valve, the normally closed node of the valve position feedback switch in the PLC control program is turned on. The high-frequency quick-cut valve closing output is designated to send out. At this time, the valve position closing speed alarm closing timer starts to accumulate, and the high-frequency quick-cutting valve starts to perform the opening action. During the action, the valve closing speed alarm timer is accumulated to the preset time, but the high-frequency quick-cut valve is not actually opened in place, that is, the closing valve position feedback switch is still in the closed state, then the closing valve position timeout alarm switch is triggered. . When the closing valve position timeout alarm switch is triggered within the preset time, the computer control terminal will display alarm information and alarm sound, indicating that the high-frequency fast-cut valve closes slowly.

Example 4

In the actual operation process, an induction iron block is fixed at the end of the part connecting the output shaft of the actuator and the valve stem, and two 24V DC two-wire electromagnetic proximity switches are installed vertically near the output shaft of the actuator shell to open the valve. The detection device of position and closing valve position. After the installation is completed, the preset time should be set according to the actual VPSA process system. Different VPSA process systems should be set with different preset times. Generally, the range of preset time is set between 700 and 1100 milliseconds. between.

When measuring the speed of closing the valve position, the high-frequency quick-cut valve is in the open position, and the open valve position feedback switch is in the closed state. When the operator controls to close the high-frequency quick-cut valve, the normally closed node of the valve position feedback switch in the PLC control program is turned on. The high-frequency quick-cut valve closing output is designated to send out. At this time, the valve position closing speed alarm closing timer starts to accumulate, and the high-frequency quick-cutting valve starts to perform the opening action. During the action, the valve position closing speed alarm timer is accumulated to the preset time, but the high-frequency quick-cut valve still does not act, that is, the closing valve position feedback switch is always in the closed state. In this case, the closing valve position timeout alarm switch also will be triggered. When the closing valve position timeout alarm switch is triggered within the preset time, the computer control terminal will display alarm information and alarm sound, indicating that the high-frequency quick-cut valve is not closed.

Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present invention, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (3)

1. The method for accurately detecting the switching speed of the high-frequency fast-switching valve in the VPSA process is characterized by comprising the steps of installing a detection device for opening and closing a valve position on a high-frequency fast-switching valve execution mechanism; setting a preset time; measuring and judging the transmission time of the valve position signal; after early warning, controlling and adjusting a high-frequency quick-switching valve;

the detection device for opening and closing the valve position is arranged on the high-frequency quick-switching valve actuating mechanism, an induction iron block is fixed at the end part of a part, connected with a valve rod, of an output shaft of the actuating mechanism, and two 24V direct-current two-wire electromagnetic proximity switches are vertically arranged at the position close to the output shaft of the shell of the actuating mechanism and serve as the detection device for opening and closing the valve position;

the detection devices for opening and closing the valve positions rotate synchronously with the output shaft of the actuating mechanism;

the transmission time of the valve position signal is judged by accumulating the time of the valve position opening speed alarm timer and the valve position closing speed alarm timer;

after the early warning, the high-frequency fast-switching valve is controlled and adjusted, when the valve position overtime alarm switch is opened and triggered within the preset time, the computer control end generates alarm information and alarm sound to prompt that the opening speed of the high-frequency fast-switching valve is low;

when the valve position overtime opening alarm switch is triggered outside the preset time, the computer control end generates alarm information and alarm sound to prompt that the high-frequency quick-switching valve is not opened;

after the early warning, the high-frequency fast-switching valve is controlled and adjusted, when a closing valve overtime alarm switch is triggered within preset time, alarm information and alarm sound can appear at a computer control end, and the closing speed of the high-frequency fast-switching valve is prompted to be slow;

when the closing valve position overtime alarm switch is triggered outside the preset time, the computer control end will generate alarm information and alarm sound to prompt the high-frequency quick-switching valve not to be closed.

2. The method for accurately detecting the switching speed of the high-frequency fast-switching valve of the VPSA process as claimed in claim 1, wherein the preset time is set according to different VPSA process systems.

3. The method for accurately detecting the switching speed of the high-frequency fast-switching valve in the VPSA process according to claim 2, wherein the preset time is set within a time range of 700-1100 milliseconds.

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