CN108061195B - Method for accurately detecting switching speed of high-frequency quick-switching valve in VPSA process - Google Patents
Method for accurately detecting switching speed of high-frequency quick-switching valve in VPSA process Download PDFInfo
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- CN108061195B CN108061195B CN201711353292.7A CN201711353292A CN108061195B CN 108061195 B CN108061195 B CN 108061195B CN 201711353292 A CN201711353292 A CN 201711353292A CN 108061195 B CN108061195 B CN 108061195B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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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
Technical Field
The invention relates to the technical field of high-frequency quick-switching valves, in particular to a method for accurately detecting the switching speed of a high-frequency quick-switching valve in a VPSA (vacuum pressure swing adsorption) process.
Background
High-frequency switching valves for fluid switching of gas pipelines are commonly used in the current VPSA production process. In the prior art, the asynchronous, jamming and limiting adjustment faults of the high-frequency quick-switching valve are multiple faults, and the continuity and reliability of automatic production of the VPSA system can be influenced. The main reason that the failure is difficult to solve is the lack of accurate monitoring and early warning of the speed and time of the fast-switching valve. The main reasons are as follows: the field valve lacks a perfect and reliable valve position detection device; equipment abnormality cannot be early warned; the PLC software programming is not sufficient.
Only 1 valve position of the existing high-frequency quick-switching valve is designed, and even no detection element is arranged. When a valve without a valve position detection element is switched on and off, the actual position of the valve cannot be determined at all, and even if 1 detection element is provided, only one valve position (open/closed position) can be detected. Therefore, the valve leakage and the improper card punching in the process production process can not be judged visually. The actual position and the switching signal of the on-site valve can not enter the PLC monitoring system, the actual running condition of the on-site valve can not be accurately judged, effective measures can not be taken in time to prevent the fault vehicle from stopping, and the opportunity for correcting the position and the position of the valve is missed. Also, because of the lack of on-site valve position sensing elements and the lack of depth of the VPSA process sarcasm prevention scheme, the logic and methods of sensing valve actuation speed are ignored by programmers in the programming.
The invention aims to solve the problems that in the prior art, the high-frequency quick-switching valve is asynchronous, jammed and limited in adjustment faults caused by lack of accurate monitoring and early warning on the speed and time of the quick-switching valve are multiple faults, and the problems are avoided by accurate detection and early warning.
Disclosure of Invention
The invention aims to provide a method for accurately detecting the switching speed of a high-frequency quick-switching valve in a VPSA (vacuum pressure swing adsorption) process. The problems of asynchrony, jamming and limiting adjustment faults of the existing high-frequency quick-switching valve are solved.
In order to achieve the purpose, the technical scheme of the invention is to provide a method for accurately detecting the speed of a high-frequency quick-switching valve in a VPSA process during switching. The method for accurately detecting the switching speed of the high-frequency quick-switching valve of the VPSA process comprises the steps of installing a detection device for opening and closing the valve position on a high-frequency quick-switching valve execution 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.
Step 1: a detection device for opening and closing the valve position is arranged on the high-frequency quick-cutting valve actuating mechanism;
the angle of the high-frequency quick-cutting valve opening position action is clockwise 90 degrees, and the angle of the high-frequency quick-cutting valve closing position action is anticlockwise 90 degrees. An induction iron block is fixed at the end part of a part connecting an output shaft of the actuating mechanism and a valve rod of the valve, and two 24V direct-current two-wire electromagnetic proximity switches are vertically installed at the position close to the output shaft of a shell of the actuating mechanism and serve as detection devices for opening and closing the valve position. The two position signals enable the key component for accurately measuring the action speed of the quick-switching valve to accurately measure the action speed, when the valve position is opened and closed, the installed detection device can synchronously rotate with the output shaft of the actuating mechanism, the detection device is transmitted to the interior of the PLC through the on-off of the loop node of the electromagnetic induction switch, and an operator can monitor and master the actual opening and closing of the valve remotely.
Step 2: setting a preset time;
the preset time is set according to the actual VPSA process system. Different VPSA process systems need to set different preset time, and the phenomenon of abnormal speed of different high-speed fast-switching valves can be measured through different preset time. Generally, the larger the high-frequency quick-switching valve is, the longer the preset time is. The preset time lock is set within the range of 700-1100 milliseconds.
And step 3: measuring and judging the transmission time of the valve position signal;
the speed of the electric signal in the line is in the light speed level, and the distance from the electromagnetic proximity switch element to the PLC module is not more than 1 kilometer, so that the transmission time of the electric signal which goes back and forth in the line is ignored.
When the speed of opening the valve position is measured, the high-frequency quick-cutting valve is in the closed position, and the valve position closing feedback switch is in the closed state. When an operator controls to open the high-frequency quick-cutting valve, a normally open node of a valve position feedback switch in a PLC control program is connected, an output instruction of opening the high-frequency quick-cutting valve is sent, the valve position opening speed alarm timer starts to accumulate at the moment, and meanwhile, the high-frequency quick-cutting valve starts to execute the opening action. In the action process, the valve position opening speed alarm timer accumulates to preset time, and the high-frequency quick-switching valve is not actually opened in place, namely the valve position opening feedback switch is still in a closed state, and the valve position opening overtime alarm switch is triggered.
If the high-frequency quick-cutting valve is opened after an output instruction is sent, the preset time is reached, the high-frequency quick-cutting valve does not act, namely, the valve position feedback switch is opened and is always in a closed state, and the valve position overtime opening alarm switch is triggered under the condition.
When the speed of closing the valve position is measured, the high-frequency quick-cutting valve is in an opening position, and the valve position feedback switch is opened to be in a closed state. When an operator controls to close the high-frequency quick-switching valve, a normally closed node of the valve position feedback switch in the PLC control program is switched on. And the high-frequency fast-switching valve closing output is appointed to be sent out, at the moment, the valve position closing speed alarm closing timer starts to accumulate and count, and meanwhile, the high-frequency fast-switching valve starts to execute the opening action. In the action process, the valve position closing speed alarm timer accumulates to preset time, and the high-frequency quick-switching valve is not actually opened in place, namely the closing valve position feedback switch is still in a closed state, and the closing valve position overtime alarm switch is triggered.
If the high-frequency quick-cut valve closing output designation is sent, the preset time is reached and the high-frequency quick-cut valve does not act, namely the closing valve position feedback switch is always in a closed state, and the closing valve position overtime alarm switch is triggered under the condition.
And 4, step 4: after early warning, controlling and adjusting a high-frequency quick-switching valve;
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 high-frequency fast-switching valve is slow in opening speed;
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.
When the closing valve position overtime alarm switch is triggered within the preset time, the computer control end generates alarm information and alarm sound to prompt the high-frequency fast-switching valve to be closed slowly;
when the closing valve position overtime alarm switch is triggered within the preset time, the computer control end generates alarm information and alarm sound to prompt the high-frequency quick-switching valve not to be closed.
The invention has the following advantages: 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.
Drawings
FIG. 1 is a block flow diagram of the steps of the present invention.
Fig. 2 is a program control diagram of the present invention.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention relates to 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 execution mechanism; setting a preset time; measuring and judging the transmission time of the valve position signal; after early warning, the high-frequency quick-switching valve is controlled and adjusted.
Example 1
In the actual operation process, an induction iron block is fixed at the end part of a part, connected with a valve rod, of an output shaft of an actuating mechanism, and two 24V direct-current two-wire electromagnetic proximity switches are vertically installed at the position close to the output shaft of a shell of the actuating mechanism and serve as detection devices for opening and closing a valve position. After the installation is finished, the preset time is set according to the actual VPSA process system, different VPSA process systems need to set different preset times, and the range of the preset time is generally set to be 700-1100 milliseconds.
When the speed of opening the valve position is measured, the high-frequency quick-cutting valve is in the closed position, and the valve position closing feedback switch is in the closed state. When an operator controls to open the high-frequency quick-cutting valve, a normally open node of a valve position feedback switch in a PLC control program is connected, an output instruction of opening the high-frequency quick-cutting valve is sent, the valve position opening speed alarm timer starts to accumulate at the moment, and meanwhile, the high-frequency quick-cutting valve starts to execute the opening action. In the action process, the valve position opening speed alarm timer accumulates to preset time, and the high-frequency quick-switching valve is not actually opened in place, namely the valve position opening feedback switch is still in a closed state, and the valve position opening overtime alarm switch is triggered. When the valve position overtime opening alarm switch is triggered within the preset time, the computer control end generates alarm information and alarm sound to prompt the high-frequency fast-switching valve to be opened slowly.
Example 2
In the actual operation process, an induction iron block is fixed at the end part of a part, connected with a valve rod, of an output shaft of an actuating mechanism, and two 24V direct-current two-wire electromagnetic proximity switches are vertically installed at the position close to the output shaft of a shell of the actuating mechanism and serve as detection devices for opening and closing a valve position. After the installation is finished, the preset time is set according to the actual VPSA process system, different VPSA process systems need to set different preset times, and the range of the preset time is generally set to be 700-1100 milliseconds.
When the speed of opening the valve position is measured, the high-frequency quick-cutting valve is in the closed position, and the valve position closing feedback switch is in the closed state. When an operator controls to open the high-frequency quick-cutting valve, a normally open node of a valve position feedback switch in a PLC control program is connected, an output instruction of opening the high-frequency quick-cutting valve is sent, the valve position opening speed alarm timer starts to accumulate at the moment, and meanwhile, the high-frequency quick-cutting valve starts to execute the opening action. In the action process, the valve position opening speed alarm timer accumulates to preset time, the high-frequency quick-cut valve does not act, namely the valve position feedback switch is opened and is always in a closed state, and the valve position overtime opening alarm switch is triggered under the condition. When the valve position overtime opening alarm switch is triggered within 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.
Example 3
In the actual operation process, an induction iron block is fixed at the end part of a part, connected with a valve rod, of an output shaft of an actuating mechanism, and two 24V direct-current two-wire electromagnetic proximity switches are vertically installed at the position close to the output shaft of a shell of the actuating mechanism and serve as detection devices for opening and closing a valve position. After the installation is finished, the preset time is set according to the actual VPSA process system, different VPSA process systems need to set different preset times, and the range of the preset time is generally set to be 700-1100 milliseconds.
When the speed of closing the valve position is measured, the high-frequency quick-cutting valve is in an opening position, and the valve position feedback switch is opened to be in a closed state. When an operator controls to close the high-frequency quick-switching valve, a normally closed node of the valve position feedback switch in the PLC control program is switched on. And the high-frequency fast-switching valve closing output is appointed to be sent out, at the moment, the valve position closing speed alarm closing timer starts to accumulate and count, and meanwhile, the high-frequency fast-switching valve starts to execute the opening action. In the action process, the valve position closing speed alarm timer accumulates to preset time, and the high-frequency quick-switching valve is not actually opened in place, namely the closing valve position feedback switch is still in a closed state, and the closing valve position overtime alarm switch is triggered. When the closing valve position overtime alarm switch is triggered in the preset time, the computer control end generates alarm information and alarm sound to prompt the high-frequency fast-switching valve to close slowly.
Example 4
In the actual operation process, an induction iron block is fixed at the end part of a part, connected with a valve rod, of an output shaft of an actuating mechanism, and two 24V direct-current two-wire electromagnetic proximity switches are vertically installed at the position close to the output shaft of a shell of the actuating mechanism and serve as detection devices for opening and closing a valve position. After the installation is finished, the preset time is set according to the actual VPSA process system, different VPSA process systems need to set different preset times, and the range of the preset time is generally set to be 700-1100 milliseconds.
When the speed of closing the valve position is measured, the high-frequency quick-cutting valve is in an opening position, and the valve position feedback switch is opened to be in a closed state. When an operator controls to close the high-frequency quick-switching valve, a normally closed node of the valve position feedback switch in the PLC control program is switched on. And the high-frequency fast-switching valve closing output is appointed to be sent out, at the moment, the valve position closing speed alarm closing timer starts to accumulate and count, and meanwhile, the high-frequency fast-switching valve starts to execute the opening action. In the action process, the valve position closing speed alarm timer accumulates to preset time, and the high-frequency quick-cut valve does not act, namely the valve position closing feedback switch is always in a closed state, and under the condition, the valve position closing overtime alarm switch is triggered. When the closing valve position overtime alarm switch is triggered within the preset time, the computer control end generates alarm information and alarm sound to prompt the high-frequency quick-switching valve not to be closed.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
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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| JP7265328B2 (en) * | 2018-08-27 | 2023-04-26 | アズビル株式会社 | VALVE MAINTENANCE SUPPORT DEVICE AND SUPPORT METHOD |
| CN112212063A (en) * | 2020-09-22 | 2021-01-12 | 广东韶钢松山股份有限公司 | Control protection method and device for electric valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066501A (en) * | 1991-05-07 | 1992-11-25 | 成都科技大学 | Microcomputor detecting device for linear displacement character of governor valve |
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| US4768249A (en) * | 1985-12-30 | 1988-09-06 | Ssi Medical Services, Inc. | Patient support structure |
| US5174152A (en) * | 1991-03-06 | 1992-12-29 | Wohld Peter R | Power operated valve stem thrust verification test system |
| WO2011135155A1 (en) * | 2010-04-30 | 2011-11-03 | Metso Automation Oy | Control valve diagnostics |
| US9625349B2 (en) * | 2012-02-29 | 2017-04-18 | Fisher Controls International Llc | Time-stamped emissions data collection for process control devices |
| CN104005389B (en) * | 2014-05-15 | 2015-09-09 | 国家电网公司 | The unlatching of water intaking valve and method for closing, device and water intaking valve control system |
| CN104373674A (en) * | 2014-11-12 | 2015-02-25 | 宁夏嘉翔自控技术有限公司 | Method for controlling block valve position in timing mode |
| CN204756124U (en) * | 2015-06-17 | 2015-11-11 | 翁圣楠 | Timing alarm device of coal gas valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1066501A (en) * | 1991-05-07 | 1992-11-25 | 成都科技大学 | Microcomputor detecting device for linear displacement character of governor valve |
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