CN211117935U - TRT hydraulic bypass valve double-valve-position detection system - Google Patents
TRT hydraulic bypass valve double-valve-position detection system Download PDFInfo
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- CN211117935U CN211117935U CN201921287514.4U CN201921287514U CN211117935U CN 211117935 U CN211117935 U CN 211117935U CN 201921287514 U CN201921287514 U CN 201921287514U CN 211117935 U CN211117935 U CN 211117935U
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- linear displacement
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Abstract
A dual-valve position detection system for a TRT hydraulic bypass valve is characterized in that a rotary encoder is mounted on a valve shaft rod to measure the rotation angle of the valve shaft rod, a feedback signal of the rotation angle of the valve shaft rod measured by the rotary encoder is connected to a P L C controller, whether the feedback signal is normal or not is judged by programming in the P L C controller, a normal feedback signal value is sent to a servo controller, if the X is less than-1% or more than 110% when the range of the feedback signal X received by the P L C controller is 0-100%, or if the X is unchanged, the fluctuation of the feedback signal X is more than 10%, and if the two valve position signals are normal, a linear displacement sensor is used as a valve position feedback signal.
Description
Technical Field
The utility model relates to a metallurgical equipment technical field, in particular to TRT bypass valve double valve position detecting system that surges.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can realize that bypass valve position is accurate, reliable measurement for a long time, improve bypass valve operating stability's TRT bypass valve double valve position detecting system that surges.
The utility model discloses a solution is such:
a TRT hydraulic bypass valve double-valve-position detection system comprises a linear displacement sensor, a hydraulic oil cylinder, a valve shaft rod, a servo controller and a P L C controller, wherein a rotary encoder is mounted on the valve shaft rod to measure the rotation angle of the valve shaft rod, a feedback signal of the rotation angle of the valve shaft rod measured by the rotary encoder is connected to the P L C controller, whether the feedback signal is normal or not is judged by programming in the P L C controller, then the normal feedback signal value is sent to the servo controller, when the measurement range of the feedback signal X received by the P L C 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 signal is abnormal and when the feedback signal of the linear displacement sensor is detected, the signal is automatically switched to the rotary encoder signal to be used as a valve position feedback signal, and when the two valve position signals are normal, the linear displacement sensor is used as the valve position feedback signal.
The calculation method for measuring the valve rotation angle by the detection system comprises the following steps:
L2=L1+L
according to the cosine theorem of the triangle, the following can be obtained:
L2 2=R2+H2-2RHcos(α+β)
after calculation, the following are obtained:
l therein1H, R and α 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, L2 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the crank when the valve runs at a certain position, the indication value of a linear displacement sensor is L, and the linear displacement sensor is converted into an angle signal and then forms a valve position detection redundant detection system together with a rotary encoder.
The utility model 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 diagram of the present invention.
Fig. 2 is the valve position conversion schematic diagram of the TRT hydraulic bypass valve of the present invention.
Fig. 3 is the double-valve position detection schematic diagram 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
The utility model discloses a TRT bypass valve double-valve-position detecting system that surges through installing two sets of valve-position detection sensors on hydraulic drive device, realizes that the valve double-valve-position detects. 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 utility model discloses detailed structure is as shown in figure 1, including linear displacement sensor 1, hydraulic cylinder 2, hydraulic cylinder fixed axle 3, valve axostylus axostyle 5, servo controller, P L C controller, when the valve rotated valve totally-closed position 8, for the valve closed state, when the valve rotated valve totally-open position 6, for the valve totally-open state, the valve operation formed orbit 7.
As shown in figure 4, a rotary encoder 4 is installed on a valve shaft lever 5 to measure the rotation angle of the valve shaft lever 5, a feedback signal of the rotation angle of the valve shaft lever 5 measured by the rotary encoder 4 is connected to a P L C controller, whether the feedback signal is normal or not is judged by programming in the P L C controller, then the normal feedback signal value is sent to a servo controller, when the measurement range of the feedback signal X received by the P L C controller is 0-100%, if X is less than-1% or X is more than 110%, or when a valve control signal (given signal) is unchanged, the fluctuation of the feedback signal X is more than 10%, the feedback signal is abnormal, when the feedback signal of a linear displacement sensor is detected to be abnormal, the feedback signal is automatically switched to be the rotary encoder signal to be used as a valve position feedback signal, when two valve position feedback signals are normal, the linear displacement sensor is used as the valve position feedback signal, 1 set of rotary encoder is added on the valve shaft lever, and the matched linear displacement sensor is combined, so that the redundant measurement of the valve.
As shown in FIG. 2, the valve position is shown in the position indicated by the reference numeral L1H, R, α are constants, L1 is the distance between the connecting point of the crank when the fixed shaft of the hydraulic oil cylinder and the valve is in the 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, 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 L, then the following are provided:
L2=L1+L
according to the cosine theorem of the triangle, the following can be obtained:
L2 2=R2+H2-2RHcos(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 utility model relates to a TRT hydraulic bypass valve double-valve-position detection system's control method, including the step:
(1) the method for measuring the valve rotating angle comprises the steps of installing a rotary encoder on a valve shaft lever and measuring the rotating angle of the valve shaft lever;
(2) and a feedback signal abnormity judgment step, namely setting the feedback signal value as X, wherein the measuring range is 0-100%, and the P L C 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) when the P L C controller determines 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:
L2=L1+L
according to the cosine theorem of the triangle, the following can be obtained:
L2 2=R2+H2-2RHcos(α+β)
after calculation, the following are obtained:
l therein1H, R and α 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, L2 is the distance between the fixed shaft of the hydraulic oil cylinder and the connecting point of the crank when the valve runs at a certain position, the indication value of a linear displacement sensor is L, and the linear displacement sensor is converted into an angle signal and then forms a valve position detection redundant detection system together with a rotary encoder.
Connecting 4-20mA feedback signals of a linear displacement sensor and a rotary encoder into P L C, programming in P L C to judge whether the feedback signals are normal, and then sending the normal feedback signal values to a servo controller, wherein the feedback signals are abnormal (the feedback signal values are assumed to be X, and the measuring range is 0-100%):
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 utility model discloses on probation, the bypass valve that surges has all realized that the bivalve position detects, when arbitrary valve position sensor trouble appears, can realize automatic switch-over, does not influence the valve and normally works, has effectively improved TRT operating stability.
Claims (1)
1. A TRT hydraulic bypass valve double-valve-position detection system comprises a linear displacement sensor (1), a hydraulic oil cylinder (2), a valve shaft rod (5), a servo controller and a P L C controller, and is characterized in that a rotary encoder (4) is installed on the valve shaft rod (5) to measure the rotation angle of the valve shaft rod (5), a feedback signal of the rotation angle of the valve shaft rod (5) measured by the rotary encoder (4) is connected to the P L C controller, the P L C controller is internally programmed to judge whether the feedback signal is normal or not, then the normal feedback signal value is sent to the servo controller, when the feedback signal X received by the P L C controller is 0-100%, if the X is less than-1% or the X is more than 110%, or when the valve control signal is unchanged, the feedback signal X is greater than 10% and is abnormal, when the feedback signal of the linear displacement sensor is detected, the rotary encoder signal is automatically switched 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921287514.4U CN211117935U (en) | 2019-08-09 | 2019-08-09 | TRT hydraulic bypass valve double-valve-position detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921287514.4U CN211117935U (en) | 2019-08-09 | 2019-08-09 | TRT hydraulic bypass valve double-valve-position detection system |
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| Publication Number | Publication Date |
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| CN211117935U true CN211117935U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719071A (en) * | 2022-03-03 | 2022-07-08 | 杭州博流科技有限公司 | Opening degree calculation control method for valve positioner |
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2019
- 2019-08-09 CN CN201921287514.4U patent/CN211117935U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719071A (en) * | 2022-03-03 | 2022-07-08 | 杭州博流科技有限公司 | Opening degree calculation control method for valve positioner |
| CN114719071B (en) * | 2022-03-03 | 2023-09-08 | 博流控制技术(浙江)有限公司 | Opening degree calculation control method for valve positioner |
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