CN110541963A - Double-valve-position detection system and control method for TRT hydraulic bypass valve - Google Patents
Double-valve-position detection system and control method for TRT hydraulic bypass valve Download PDFInfo
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- CN110541963A CN110541963A CN201910735635.9A CN201910735635A CN110541963A CN 110541963 A CN110541963 A CN 110541963A CN 201910735635 A CN201910735635 A CN 201910735635A CN 110541963 A CN110541963 A CN 110541963A
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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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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
a double-valve-position detection system and a control method for a TRT hydraulic bypass valve are characterized in that a rotary encoder is mounted on a valve shaft lever to measure the rotation angle of the valve shaft lever; the feedback signal of the rotation angle of the valve shaft lever measured by the rotary encoder is accessed into the PLC controller, whether the feedback signal is normal or not is judged by programming in the PLC controller, then the normal feedback signal value is sent to the servo controller, and when the feedback signal X received by the PLC controller has the measuring range of 0-100%, if X is less than-1% or X is more than 110%, or when the valve control signal is unchanged, the fluctuation of the feedback signal X is more than 10%, if X is less than-1% or X is more than 110%; when the two valve position signals are normal, the linear displacement sensor is used as a valve position feedback signal. The TRT hydraulic bypass valve has the advantages that double-valve-position detection is realized, and the reliability of valve operation is improved; the on-line maintenance of the feedback signal fault of the valve is realized, the downtime of the TRT is reduced, and the generated energy is improved; the TRT operation safety is improved.
Description
Technical Field
the invention relates to the technical field of metallurgical equipment, in particular to a TRT hydraulic bypass valve double-valve-position detection system and a control method.
background
when the TRT normally runs, the hydraulic bypass valve is normally in a full-closed state; when the TRT is stopped or the coal gas amount of the blast furnace is too large, the bypass valve participates in adjustment to ensure the stable pressure at the top of the blast furnace. At present, valve position detection of a TRT bypass valve is realized by mounting a linear displacement sensor on a hydraulic oil cylinder of an actuating mechanism, and one valve is provided with a set of valve position sensor. In the actual use process, the following problems mainly exist:
1. once the valve position sensor breaks down, the valve can be opened automatically and fully, the adjusting function is lost, the pressure relief of the blast furnace is caused, the top pressure fluctuates, the production of the blast furnace is seriously influenced, and meanwhile, if the fault needs to be processed, the TRT must be stopped, and the generating capacity is influenced.
2. the valve position is detected by linear displacement, and the indication value is deviated from the actual angle of the valve.
Disclosure of Invention
the invention aims to provide a double-valve-position detection system and a control method of a TRT hydraulic bypass valve, which can realize long-term accurate and reliable measurement of the valve position of the bypass valve and improve the running stability of the bypass valve.
The solution of the invention is such that:
A double-valve-position detection system of a TRT hydraulic bypass valve comprises a linear displacement sensor, a hydraulic oil cylinder, a valve shaft lever, a servo controller and a PLC (programmable logic controller), wherein a rotary encoder is arranged on the valve shaft lever to measure the rotation angle of the valve shaft lever; the feedback signal of the rotation angle of the valve shaft lever measured by the rotary encoder is accessed into a PLC controller, whether the feedback signal is normal or not is judged by programming in the PLC controller, then the normal feedback signal value is sent to a servo controller, when the feedback signal X received by the PLC controller is 0-100%, if X is less than-1% or X is more than 110%, or when the valve control signal is unchanged, the fluctuation of the feedback signal X is more than 10%, the feedback is abnormal, and when the feedback signal of the linear displacement sensor is detected to be abnormal, the feedback signal is automatically switched to the rotary encoder signal to be used as a valve position feedback signal; and if the two valve position signals are normal, the linear displacement sensor is used as a valve position feedback signal.
a control method of a TRT hydraulic bypass valve double-valve-position detection system comprises the following steps:
(1) Measuring the rotation angle of the valve: measuring the rotation angle of the valve, and feeding back a measured rotation angle signal to the PLC;
(2) A feedback signal abnormity judgment step: setting the feedback signal value as X, the measuring range is 0-100%, and the PLC controller controls according to the feedback signal value X according to the following strategies:
1) when X is less than-1% or X is more than 110%, or when the valve control signal is unchanged, the fluctuation of the feedback signal X is more than 10%, the feedback signal is abnormal, and when the feedback signal of the linear displacement sensor is detected to be abnormal, the signal is automatically switched to the rotary encoder to be used as a valve position feedback signal;
2) When the two valve position signals are normal, the linear displacement sensor is used as a valve position feedback signal;
(3) and when the PLC judges that the feedback signal is normal, the normal feedback signal value is sent to the servo controller.
The more specific technical scheme also comprises the following steps: in the step (1), the method for measuring the rotation angle of the valve comprises the following steps: and a rotary encoder is arranged on the valve shaft lever to measure the rotation angle of the valve shaft lever.
Further: the calculation method for measuring the rotation angle of the valve comprises the following steps:
L=L+L
according to the cosine theorem of the triangle, the following can be obtained:
L=R+H-2RHcos(α+β)
After calculation, the following are obtained:
wherein L1, H, R and alpha are constants, L1 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the crank when the valve is in a fully closed position, H is the distance between the shaft lever of the valve and the fixed shaft of the hydraulic oil cylinder, R is the length of the crank, and L2 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the crank of the valve when the valve runs at a certain position; assuming that the linear displacement sensor shows a value L; after the linear displacement sensor is converted into an angle signal, the angle signal and the rotary encoder can form a valve position detection redundancy detection system.
the invention has the advantages that:
1. The TRT hydraulic bypass valve realizes double-valve-position detection, improves the reliability of valve operation and improves the operation stability of the bypass valve.
2. the on-line maintenance of the feedback signal fault of the valve is realized, the downtime of the TRT is reduced, and the generated energy is improved.
3. The TRT operation safety is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic illustration of the valve position transition of the TRT hydraulic bypass valve of the present invention.
Fig. 3 is a schematic diagram of the dual valve position detection of the TRT hydraulic bypass valve of the present invention.
Fig. 4 is a schematic view of the TRT hydraulic bypass valve configuration.
The parts of the drawings are detailed as follows: the hydraulic control system comprises a linear displacement sensor 1, a hydraulic oil cylinder 2, a hydraulic oil cylinder fixing shaft 3, a rotary encoder 4, a valve shaft lever 5, a valve full-opening position 6, a running track 7, a valve full-closing position 8, a valve 9 and a hydraulic driving device 10.
Detailed Description
According to the double-valve-position detection system of the TRT hydraulic bypass valve, the double-valve-position detection of the valve is realized by installing two sets of valve-position detection sensors on the hydraulic driving device. The method comprises the following specific steps: 1 set of rotary encoder is added on the valve shaft lever, and the redundant measurement of the valve opening degree is realized by combining the original matched linear displacement sensor.
And converting the linear displacement indicating value of the valve position into an angular displacement indicating value so as to truly feed back the indicating value of the linear displacement sensor to the position of the valve and simultaneously display the valve position to be consistent with the rotary encoder.
The detailed structure of the invention is shown in figure 1, and comprises a linear displacement sensor 1, a hydraulic oil cylinder 2, a hydraulic oil cylinder fixing shaft 3, a valve shaft lever 5, a servo controller and a PLC (programmable logic controller), wherein the valve is in a valve closing state when the valve rotates to a valve full-closing position 8, and is in a valve full-opening state when the valve rotates to a valve full-opening position 6, and the valve runs to form a running track 7.
as shown in fig. 4, a rotary encoder 4 is mounted on the valve shaft 5 to measure the rotation angle of the valve shaft 5; the feedback signal of the rotation angle of the valve shaft lever 5 measured by the rotary encoder 4 is accessed into a PLC controller, whether the feedback signal is normal or not is judged by programming in the PLC controller, then the normal feedback signal value is sent to a servo controller, when the feedback signal X received by the PLC controller has the measuring range of 0-100%, if X is less than-1% or X is more than 110%, or when the valve control signal (given signal) is unchanged, the fluctuation of the feedback signal X is more than 10%, the feedback is abnormal, and when the feedback signal of the linear displacement sensor is detected to be abnormal, the feedback signal is automatically switched to the rotary encoder signal to be used as a valve position feedback signal; and if the two valve position feedback signals are normal, the linear displacement sensor is used as the valve position feedback signal. Through increasing 1 set of rotary encoder on the valve axostylus axostyle, combine original supporting linear displacement sensor, realize the redundant measurement to the valve aperture.
As shown in figure 2, the size of the valve position of the valve at a certain position is shown as a mark in the figure, wherein L1, H, R and alpha are constants, L1 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the crank when the valve is at a fully closed position, H is the distance between the valve shaft lever and the fixed shaft of the hydraulic oil cylinder, R is the length of the crank, and L2 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the valve crank when the valve runs at a certain position. Assuming that the linear displacement sensor shows a value L, there are:
L=L+L
according to the cosine theorem of the triangle, the following can be obtained:
L=R+H-2RHcos(α+β)
After calculation, the following are obtained:
after the linear displacement sensor is converted into an angle signal, the angle signal and the rotary encoder can form a valve position detection redundancy detection system.
As shown in fig. 3, the control method of the double-valve-position detection system of the TRT hydraulic bypass valve of the present invention includes the steps of:
(1) Measuring the rotation angle of the valve: measuring the rotation angle of the valve, and feeding back a measured rotation angle signal to the PLC; the method for measuring the rotation angle of the valve comprises the following steps: installing a rotary encoder on the valve shaft lever, and measuring the rotation angle of the valve shaft lever;
(2) a feedback signal abnormity judgment step: setting the feedback signal value as X, the measuring range is 0-100%, and the PLC controller controls according to the feedback signal value X according to the following strategies:
1) When X is less than-1% or X is more than 110%, or when the valve control signal is unchanged, the fluctuation of the feedback signal X is more than 10%, the feedback signal is abnormal, and when the feedback signal of the linear displacement sensor is detected to be abnormal, the signal is automatically switched to the rotary encoder to be used as a valve position feedback signal;
2) When the two valve position feedback signals are normal, the linear displacement sensor is used as the valve position feedback signal;
(3) and when the PLC judges that the feedback signal is normal, the normal feedback signal value is sent to the servo controller.
the calculation method for measuring the rotation angle of the valve comprises the following steps:
L=L+L
according to the cosine theorem of the triangle, the following can be obtained:
L=R+H-2RHcos(α+β)
after calculation, the following are obtained:
Wherein L1, H, R and alpha are constants, L1 is the distance between the connecting point of the crank when the fixing shaft of the hydraulic oil cylinder and the valve is in a fully closed position, H is the distance between the shaft lever of the valve and the fixing shaft of the hydraulic oil cylinder, R is the length of the crank, and L2 is the distance between the connecting point of the fixing shaft of the hydraulic oil cylinder and the crank of the valve when the valve runs at a certain position. Assuming that the linear displacement sensor shows a value L; after the linear displacement sensor is converted into an angle signal, the angle signal and the rotary encoder can form a valve position detection redundancy detection system.
the 4-20mA feedback signals of the linear displacement sensor and the rotary encoder are accessed to a PLC, whether the feedback signals are normal or not is judged by programming in the PLC, then the normal feedback signal values are sent to a servo controller, and the judgment method of the feedback signal abnormity (the feedback signal value is assumed to be X, and the measuring range is 0-100 percent):
when X < -1% or X > 110%, or when the valve control signal is unchanged, the feedback signal X fluctuates by > 10%.
when the two valve position feedback signals are normal, the linear displacement sensor is used as the valve position feedback signal. When the feedback signal of the linear displacement sensor is detected to be abnormal, the signal is automatically switched to the rotary encoder to be used as a valve position feedback signal.
the invention is tried in blast furnace TRT of 3#, 4#, 5# blast furnaces of a willow steel-making plant, the hydraulic bypass valve realizes double-valve-position detection, when any valve position sensor fails, automatic switching can be realized, the normal work of the valve is not influenced, and the operation stability of the TRT is effectively improved.
Claims (4)
1. the utility model provides a TRT bypass valve double valve position detecting system that surges, includes linear displacement sensor (1), hydraulic cylinder (2), valve axostylus axostyle (5), servo controller, PLC controller, its characterized in that: a rotary encoder (4) is arranged on the valve shaft lever (5) to measure the rotation angle of the valve shaft lever (5); the feedback signal of the rotation angle of the valve shaft lever (5) measured by the rotary encoder (4) is accessed into a PLC controller, whether the feedback signal is normal or not is judged by programming in the PLC controller, then the normal feedback signal value is sent to a servo controller, when the feedback signal X received by the PLC controller has the measuring range of 0-100%, if X is less than-1% or X is more than 110%, or when the valve control signal is unchanged, the fluctuation of the feedback signal X is more than 10%, the feedback is abnormal, and when the feedback signal of the linear displacement sensor is detected to be abnormal, the feedback signal is automatically switched to the rotary encoder signal to be used as a valve position feedback signal; and if the two valve position signals are normal, the linear displacement sensor is used as a valve position feedback signal.
2. A control method of a TRT hydraulic bypass valve double-valve-position detection system is characterized by comprising the following steps: the method comprises the following steps:
Measuring the rotation angle of the valve: measuring the rotation angle of the valve, and feeding back a measured rotation angle signal to the PLC;
A feedback signal abnormity judgment step: setting the feedback signal value as X, the measuring range is 0-100%, and the PLC controller controls according to the feedback signal value X according to the following strategies:
When X is less than-1% or X is more than 110%, or when the valve control signal is unchanged, the fluctuation of the feedback signal X is more than 10%, the feedback signal is abnormal, and when the feedback signal of the linear displacement sensor is detected to be abnormal, the signal is automatically switched to the rotary encoder to be used as a valve position feedback signal;
When the two valve position signals are normal, the linear displacement sensor is used as a valve position feedback signal;
And when the PLC judges that the feedback signal is normal, the normal feedback signal value is sent to the servo controller.
3. the control method of the TRT hydraulic bypass valve double valve position detection system according to claim 2, characterized in that: in the step (1), the method for measuring the rotation angle of the valve comprises the following steps: a rotary encoder (4) is arranged on the valve shaft lever (5) to measure the rotation angle of the valve shaft lever (5).
4. The control method of the TRT hydraulic bypass valve double valve position detection system according to claim 3, characterized in that: the calculation method for measuring the rotation angle of the valve comprises the following steps:
L=L+L
according to the cosine theorem of the triangle, the following can be obtained:
L=R+H-2RHcos(α+β)
After calculation, the following are obtained:
wherein L1, H, R and alpha are constants, L1 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the crank when the valve is in a fully closed position, H is the distance between the shaft lever of the valve and the fixed shaft of the hydraulic oil cylinder, R is the length of the crank, and L2 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the crank of the valve when the valve runs at a certain position; assuming that the linear displacement sensor shows a value L; after the linear displacement sensor is converted into an angle signal, the angle signal and the rotary encoder can form a valve position detection redundancy detection system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910735635.9A CN110541963A (en) | 2019-08-09 | 2019-08-09 | Double-valve-position detection system and control method for TRT hydraulic bypass valve |
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| CN201910735635.9A CN110541963A (en) | 2019-08-09 | 2019-08-09 | Double-valve-position detection system and control method for TRT hydraulic bypass valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113618030A (en) * | 2021-07-30 | 2021-11-09 | 广西柳钢中金不锈钢有限公司 | Automatic spray cooling method for pig casting machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113618030A (en) * | 2021-07-30 | 2021-11-09 | 广西柳钢中金不锈钢有限公司 | Automatic spray cooling method for pig casting machine |
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