CN202629258U - Electric executing mechanism anomaly-prevention circuit suitable for analog quantity control - Google Patents
Electric executing mechanism anomaly-prevention circuit suitable for analog quantity control Download PDFInfo
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- CN202629258U CN202629258U CN 201220155581 CN201220155581U CN202629258U CN 202629258 U CN202629258 U CN 202629258U CN 201220155581 CN201220155581 CN 201220155581 CN 201220155581 U CN201220155581 U CN 201220155581U CN 202629258 U CN202629258 U CN 202629258U
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- circuit
- actuator
- forming
- executing mechanism
- decision circuitry
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Abstract
The utility model relates to an electric executing mechanism anomaly-prevention circuit suitable for analog quantity control. The electric executing mechanism anomaly-prevention circuit suitable for the analog quantity control mainly comprises a current detection return circuit composed of an integrated circuit (IC) 1 and an IC 2, a difference module amplification circuit composed of an IC 3 and an IC 4, a comparison circuit composed of an IC 5 and an IC 6, a logical judgment circuit composed of an IC 7, an IC 8, an IC 9 and an IC 10, and a four-way latching circuit composed of triodes Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and Q9, wherein an input end of the difference module amplification circuit is connected with the current detection return circuit, an output end of the difference module amplification circuit is connected with the comparison circuit, an input end of the logical judgment circuit is connected with the comparison circuit, and an output end of the logical judgment circuit is connected with the latching circuit. The electric executing mechanism anomaly-prevention circuit suitable for the analog quantity control can carry out on-line detection and protection on a servo control return circuit inside an executing mechanism, can judge faults of the executing mechanism on line, can warn operation workers timely when the faults occur, controls valve position functions of the executing mechanism automatically, prevents magnification of production accidents caused by the faults of the executing mechanism, is capable of fully guaranteeing safe and stable operation of production, and is novel in structure, convenient to install, and worthy of popularization and application.
Description
Technical field
The utility model relates to the anti-unusual fluctuation circuit in a kind of electric actuator system, relates in particular to be used in the electric actuator circuit that its inside servo control loop is carried out online detection and protection, belongs to and measures the electric variable technical field.
Background technique
Development along with automatic control technology; Electric actuator is applied in the instrument regulating and controlling system more and more; But when break down in loops such as the inner servocontrol of actuator, shift capacitor, position feedback, actuator is uncontrolled circuit controls, beats voluntarily that open and close are dead, vibration or tripping etc.; Adjusting brings serious consequence to production technology; Influence equipment operation safety, therefore, exigence is a kind of to be used for circuit that its inside servo control loop is carried out online detection and protection in electric actuator.
Summary of the invention
The utility model technical problem to be solved is; A kind of analog signals (4-20mA) and the position feed back signal (4-20mA) of actuator that can gather easily actuating mechanism controls proposed; Compare and logical process; Judge actuator's fault, and actuator is carried out the online faut detection of valve position maintenance and the circuit of protection.
The technological scheme of the utility model is following:
A kind of electric actuator is prevented the unusual fluctuation circuit, and this circuit mainly comprises with the bottom: IC
1, IC
2The current detection circuit of forming; IC
3, IC
4The differential mode amplification circuit of forming; IC
5, IC
6The comparison circuit of forming; IC
7, IC
8, IC
9, IC
10The logic judging circuit of forming; Triode Q
1, Q
2, Q
3, Q
4, Q
5, Q
6, Q
7, Q
8, Q
9No. four latching circuits of forming; The input end of differential mode amplification circuit connects current detection circuit, and output terminal connects comparison circuit, and the input end of logic judging circuit connects comparison circuit, and output terminal connects latching circuit.
As a kind of improvement of the utility model, said IC
2The voltage of output is divided into two the tunnel, the one tunnel and meets differential mode amplification circuit IC
4Positive input terminal, another road meets differential mode amplification circuit IC through the RC delay circuit
4Negative input end, said RC delay circuit is by resistance R
5, capacitor C
1, resistance R
6Form.Because the voltage at electric capacity two ends can not suddenly change, so IC
4The variable of negative terminal input voltage is total to fall behind and the anode input voltage, thereby realizes the online convenient and simplely moving direction that detects actuator.
As a kind of improvement of the utility model, said comparison circuit IC
5Comprise IC
5-1, IC
5-2Form two road comparator circuits and IC
5-3Form " sending " and reach " behaviour far away/on the spot " and withdraw from circuit, " on the spot "/" behaviour far away " switch is used for satisfying the operation of actuator when meeting an urgent need occasion and inspecting state.
A kind of improvement as the utility model is provided with capacitor C in the said comparison circuit
2, resistance R
13The RC delay circuit of forming is provided with capacitor C in the said decision circuitry
3, resistance R
15The RC delay circuit of forming utilizes the voltage at electric capacity two ends not suddenly change, because electric capacity has the process of a charging, thereby has overcome the hysteresis quality that detects actuator's moving direction because of online, causes the defective of testing circuit erroneous judgement.
As a kind of improvement of the utility model, said logic judging circuit is made up of following, IC
7-1Through or door form the order decision circuitry that transfinites, IC
7-2Through or door form the unusual decision circuitry of actuator's position feedback, IC
8Form actuator's motor decision circuitry that shuts down, IC through biconditional gate
9-1" open " operation exception decision circuitry, IC through forming actuator with door
9-2Through forming actuator " pass " operation exception decision circuitry, IC with door
10-1Through forming actuator's decision circuitry of stopping transport unusually, IC with door
10-2Through forming the unusual decision circuitry of actuator's position feedback with door.
As a kind of improvement of the utility model, said latching circuit mainly contains the valve position holding circuit and light emitting diode constitutes, and said valve position holding circuit is made up of two triodes, and light emitting diode can provide reference frame for the fault point of differentiating actuator rapidly.
With respect to existing technology, the advantage of the utility model is following: can be online judgement actuator fault, when it breaks down, can in time warn the operations staff, and the control executing mechanism valve position keeps automatically, prevent to cause the production accident extension because of actuator's fault; Owing to be provided with the RC delay circuit in this circuit, utilize the RC delay circuit, can detect the moving direction of actuator convenient and simplely; Fault indicating lamp provides reference frame for the fault point of differentiating actuator rapidly, the operation of actuator when the setting of " on the spot "/" behaviour far away " switch can be satisfied emergent occasion and inspecting state.Foregoing circuit can fully ensure production safety stable operation, and it is simple in structure, and cost is lower, is worthy of popularization.
Description of drawings:
Fig. 1: the utility model detects control circuit figure;
Embodiment:
Below in conjunction with accompanying drawing model utility is elaborated, as can be seen from the figure, this control circuit mainly includes: IC
1, IC
2(RCV420) two road current detection circuits of forming; IC
3, IC
4(LM741) two road differential mode amplification circuits of forming; IC
5, IC
6(LM339) state detection circuit that No. seven comparison circuits of forming are formed reach " behaviour far away/on the spot " and protects and withdraw from circuit with " sending "; IC
7(CD4071), IC
8(CD4077), IC
9, IC
10(CD4082) logic judging circuit of forming; Triode Q
1, Q
2, Q
3, Q
4, Q
5, Q
6, Q
7, Q
8, Q
9Formations such as four tunnel warning indications of forming and valve position holding circuit.
Should prevent the principle of unusual fluctuation circuit: as shown in Figure 1, teleinstruction signal I
Refer to(4～20mA) flow through IC
1Precision current/electric pressure converter, (0～5V) voltage is given IC in its output generation
3The positive input terminal of differential mode amplifier, in like manner the position feed back signal I of actuator
Instead(4～20mA) flow through IC
2, the voltage of generation is given IC
3Negative input end, IC
3Export one and I
Refer to-I
InsteadThe output voltage that is proportionate relationship is given IC
5-1, IC
5-2Form the control command state that two road comparators detect actuator.Work as I
Refer to>I
InsteadThe time actuator obtain " opening " order, actuator opens, and works as I
Refer toGreater than I
InsteadFull scale 5%-8% the time, explain " opening " order transfinite comparator IC
5-1Output high level (just transfiniting); Together should I
Refer to<i
InsteadThe time actuator obtain " pass " order, work as I
Refer toLess than I
InsteadFull scale 5%～8% o'clock, comparator IC
5-2Output high level (negative transfiniting).IC
5-1Form " opening " and order positive excess margining detecting circuit, IC
5-2Form the negative testing circuit that transfinites of " pass " order.
While IC
2The voltage of output divides two the tunnel, the one tunnel to meet IC
4Positive input terminal is leaded up to resistance R
5, capacitor C
1, resistance R
6The RC delay circuit of forming meets IC
4Negative input end is owing to the electric capacity voltage can not be suddenlyd change, so IC
4The variable of negative terminal input voltage is total to fall behind and the anode input voltage, and their difference is through IC
4After the amplification, get into IC
6Four road comparators detect the motion state of actuator.Delay time is for can be provided with 1～3 second, and the positive and negative terminal voltage deviation after the time-delay is about 1～2% of a full scale, and ((e-v)/e), R are R according to the delay time formula T=-RC*ln of RC delay circuit
5//R
6, can calculate capacitor C
1Capacity, general value is about 470 μ F.When V4+ greater than the V4-full scale 1～1.5% the time, explain that actuator is to the motion of the direction opened, comparator IC
6-2Output high level (promptly opening moving direction), when V4+ less than the V4-full scale 1～1.5% the time, comparator IC
6-1Output high level (promptly closing moving direction) is because the speed of actuator's motion is fixing when dispatching from the factory, so the rate of change of position feedback is also fixed; The variable of any one position feedback in the unit time surpasses fixed variable; All will be regarded as the position feedback fault, this variable will be fixed on 5% of full scale, surpass this variable; Comparator output high level, indication feedback fault.IC
6-1Form and close direction motion detection circuit, IC
6-2Form evolution to motion detection circuit, IC
6-3Form evolution to feedback mutant testing circuit, IC
6-4Form and close direction feedback mutant testing circuit.
IC
5-3Form " sending " and reach " behaviour far away/on the spot " and withdraw from circuit, when actuator just send electricity, owing to capacitor C
1Voltage can not be suddenlyd change, and the process of a charging is arranged, and very easily causes the testing circuit erroneous judgement this moment, and causes misoperation, capacitor C
2, resistance R
13Value is according to capacitor C
1The RC delay circuit of forming is raised to the required time of 5V from 0V and decides, in capacitor C
2IC in duration of charge
5-3Output low level; K is " on the spot/far away behaviour " switch, and with " on the spot/behaviour far away " switch gearing of actuator, when actuator got to " on the spot ", feedback is trace command no longer, very easily cause the testing circuit erroneous judgement this moment, and cause misoperation, so when K is changed to " on the spot ", IC
5-3Positive input is a low level, IC
5-3Output low level forces IC
9, IC
10The AND circuit output low level, the whole protecting circuit is withdrawed from.
IC
7-1Form and order the decision circuitry that transfinites, IC
7-1For or the door, it is input as IC
5-1, IC
5-2IC is worked as in output
5-1Or IC
5-2Output has a high level (being that the order that actuator accepts is transfinited than position feedback), IC
7-1Promptly export high level.
IC
7-2Form the unusual decision circuitry of actuator's position feedback, IC
7-2For or the door, it is input as IC
6-3, IC
6-4IC is worked as in output
6-3Or IC
6-4Output has a high level (being actuator's position feedback sudden change), IC
7-2Promptly export high level, IC
10-2Be AND circuit, it is input as IC
7-2, IC
5-3Output because during normal operation, IC
5-3Be output as constant high level; Work as IC
7-2Be output as high level, IC
10-2The output high level.
IC
8Form actuator's motor decision circuitry that shuts down, IC
8Be biconditional gate, it is input as IC
6-1, IC
6-2IC is worked as in output
6-1, IC
6-2Output is low level (being actuator's position feedback no change), IC
8The output high level.Because actuator's moving direction detects in the loop, has the RC delay circuit, moving direction detects comparatively and lags behind, and causes IC easily
8So erroneous judgement is at IC
8Output loop shunt resistor R
15, capacitor C
3The RC delay circuit of forming, its amount of delay are slightly larger than the delay time that moving direction detects the loop.
IC
9-1Form actuator and " open " operation exception decision circuitry, IC
9-1For with door, it is input as IC
5-1, IC
6-1, IC
5-3IC is worked as in output
5-1, IC
6-1Output is high level (be the order that obtains of actuator for opening order, and actuator is to closing the direction motion, and order being greater than the full scale 5%-8% that feeds back), IC
9-1The output high level.
IC
9-2Form actuator " pass " operation exception decision circuitry, IC
9-2For with door, it is input as IC
5-2, IC
6-2, IC
5-3IC is worked as in output
5-2, IC
6-2Output is high level, IC
9-2The output high level.
IC
10-1Form actuator's decision circuitry of stopping transport unusually, IC
10-1For with door, it is input as IC
7-1, IC
8, IC
5-3IC is worked as in output
7-1, IC
8Output is high level (be the full scale 5%-8% that order that actuator obtains surmounts feedback, and actuator stopping transport), IC
10-1The output high level.
Triode Q
1, Q
2, Q
3, Q
4, Q
5, Q
6, Q
7, Q
8, form No. four latching circuits respectively.Light emitting diode D
10, for actuator " opens " the operation exception tutorial light; Light emitting diode D
11, be actuator " pass " operation exception tutorial light; Light emitting diode D
12, for actuator stops tutorial light unusually; Light emitting diode D
13, be the unusual tutorial light of actuator's position feedback.Capacitor C
4～C
7Suppress electric capacity for disturbing.Q
9, relay J forms executive circuit, relay J gets electric, makes actuator's motor outage, valve position keeps, AN is the latching circuit SR.
The anti-concrete working procedure of unusual fluctuation circuit of this electric actuator is following: the analog signals (4-20mA) of actuating mechanism controls is serially connected in IC
1Input end, the position feed back signal of actuator (4-20mA) is serially connected in IC
2Input end, the input in relay J loop connect servocontrol output, and the output in relay J loop connects actuator's positive and negative rotation of motor guide line, and the relay J alarm circuit connects the DI fastener of long-range DCS, detect control circuit and load ± 12～18VDC driving power.
As teleinstruction signal I
Refer toGreater than position feed back signal I
Instead, actuator obtains " opening " order, and actuator moves to closing direction, and order is greater than the full scale 5%-8% of feedback, light emitting diode D
10Lamp is bright, and indication actuator " opens " operation exception, the relay J action, and actuator's motor outage, valve position keeps.
As teleinstruction signal I
Refer toLess than position feed back signal I
Instead, actuator obtain " pass " order, and actuator to evolution to motion, and the order less than the feedback full scale 5%-8%, light emitting diode D
11Lamp is bright, indication actuator " pass " operation exception, and the relay J action, actuator's motor outage, valve position keeps.
The order that obtains when actuator surmounts the full scale 5%-8% of feedback, and actuator stops transport light emitting diode D
12Lamp is bright, and indication actuator stops unusually, the actuating of relay, and actuator's motor outage, valve position keeps.
As actuator's position feed back signal sudden change, light emitting diode D
13Lamp is bright, and indication actuator position feedback is unusual, the relay J action, and actuator's motor outage, valve position keeps.
Can find out that the utility model utilizes current/voltage-converted circuit, comparison circuit; Logic judging circuit and indicating fault light emitting diode in conjunction with Relay-controlled Circuit, carry out online detection and protection to actuator's inside servo control loop; Circuit structure is novel, easy for installation; Can be online judgement actuator fault, when its fault, can in time warn the operations staff, and control executing mechanism valve position function automatically.Above-mentioned mode of execution only is the preferred embodiment of the utility model, is not the protection domain of the utility model, and those skilled in the art can do suitable adjustment under the prerequisite that does not break away from this claim protection domain.
Claims (6)
1. the electric actuator of a suitable analog amount control is prevented the unusual fluctuation circuit, and it is characterized in that: this circuit mainly comprises with the bottom:
IC
1, IC
2The current detection circuit of forming; IC
3, IC
4The differential mode amplification circuit of forming; IC
5, IC
6The comparison circuit of forming; IC
7, IC
8, IC
9, IC
10The logic judging circuit of forming; Triode Q
1, Q
2, Q
3, Q
4, Q
5, Q
6, Q
7, Q
8, Q
9No. four latching circuits of forming; The input end of differential mode amplification circuit connects current detection circuit, and output terminal connects comparison circuit, and the input end of logic judging circuit connects comparison circuit, and output terminal connects latching circuit.
2. electric actuator according to claim 1 is prevented the unusual fluctuation circuit, it is characterized in that: said
IC
2The voltage of output is divided into two the tunnel, the one tunnel and meets differential mode amplification circuit IC
4Positive input terminal, another road meets differential mode amplification circuit IC through the RC delay circuit
4Negative input end, said RC delay circuit is by resistance R
5, capacitor C
1, resistance R
6Form.
3. electric actuator according to claim 1 and 2 is prevented the unusual fluctuation circuit, it is characterized in that: said comparison circuit IC
5Comprise IC
5-1, IC
5-2Form two road comparator circuits and IC
5-3Forming " sending " reach " far grasp/on the spot " and withdraws from circuit.
4. electric actuator according to claim 1 and 2 is prevented the unusual fluctuation circuit, it is characterized in that: be provided with capacitor C in the said comparison circuit
2, resistance R
13The RC delay circuit of forming is provided with capacitor C in the said decision circuitry
3, resistance R
15The RC delay circuit of forming.
5. electric actuator according to claim 1 and 2 is prevented the unusual fluctuation circuit, and it is characterized in that: said logic judging circuit is made up of following, IC
7-1Through or door form the order decision circuitry that transfinites, IC
7-2Through or door form the unusual decision circuitry of actuator's position feedback, IC
8Form actuator's motor decision circuitry that shuts down, IC through biconditional gate
9-1" open " operation exception decision circuitry, IC through forming actuator with door
9-2Through forming actuator " pass " operation exception decision circuitry, IC with door
10-1Through forming actuator's decision circuitry of stopping transport unusually, IC with door
10-2Through forming the unusual decision circuitry of actuator's position feedback with door.
6. electric actuator according to claim 1 and 2 is prevented the unusual fluctuation circuit, it is characterized in that: said latching circuit mainly contains the valve position holding circuit and light emitting diode constitutes, and said valve position holding circuit is made up of two triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220155581 CN202629258U (en) | 2012-04-13 | 2012-04-13 | Electric executing mechanism anomaly-prevention circuit suitable for analog quantity control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220155581 CN202629258U (en) | 2012-04-13 | 2012-04-13 | Electric executing mechanism anomaly-prevention circuit suitable for analog quantity control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202629258U true CN202629258U (en) | 2012-12-26 |
Family
ID=47382461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220155581 Expired - Fee Related CN202629258U (en) | 2012-04-13 | 2012-04-13 | Electric executing mechanism anomaly-prevention circuit suitable for analog quantity control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202629258U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438259A (en) * | 2013-08-27 | 2013-12-11 | 中国神华能源股份有限公司 | Control system of electric actuating mechanism |
-
2012
- 2012-04-13 CN CN 201220155581 patent/CN202629258U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438259A (en) * | 2013-08-27 | 2013-12-11 | 中国神华能源股份有限公司 | Control system of electric actuating mechanism |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20200413 |