RU2681553C1 - Method for remote control of pneumatic actuator of main pipeline - Google Patents

Abstract

FIELD: pipelines.SUBSTANCE: method of remote control of a pneumatic actuator of a main pipeline is applicable to the field of automation of control of pneumatic actuators of security or shut-off valves installed on main pipelines. Each solenoid valve (35, 36) of crane (34) is simultaneously controlled by at least two of three relays (4, 5, 6) for valve (35) and (7, 8, 9) for valve (36). Each relay closes two of the three parallel sections of valve control circuit (for valve (35) sections K4.1-K5.1, K5.2-K6.1, K4.2-K6.2; for valve (36) sections K7.1-K8.1, K8.2-K9.1, K7.2-K9.2). At each site there are two pairs of contacts from different relays. Neutralization of a false switch of crane (34) in case of a malfunction of control system (3) is ensured. Operability of control circuits in case of failure of one of the three relays is preserved. Control of the performance of control circuits is permanent. DC voltage source (2), the presence of an open circuit, a circuit or sticking of relay contacts (4–9) is controlled. For control, optocoupler (10–21) is connected to each relay (4–9) with normally open contacts. Control is carried out by continuous reading of logical signals from optocouplers. Signals come to controller (1), which compares them with the test signals. Efficiency is determined by the combination of read logical signals.EFFECT: significantly improved the reliability of control of the crane and, as a result, increased trouble-free operation of main pipelines.1 cl, 1 dwg

Description

The invention relates to the field of automation of control of pneumatic actuators of safety or stopcocks installed on trunk pipelines.

In the gas industry system, pneumatic actuating cranes (hereinafter referred to as the crane) are used in the gas pipelines, piping of compressor stations, field loops of gas distribution points and other pipelines. The design of these valves provides for the movement (opening / closing) of the locking device using an electro-pneumatic control unit (EPUU), which is controlled by the Open and Close solenoid valves, which supply and create gas pressure in the corresponding EPUU pneumatic cylinder.

A known method of controlling pneumatic actuated cranes, implemented using a microprocessor control unit for cranes MBU "Crane-2" (Radkevich V.V., Zolotukhin M.V., Samarin A.A., Viktorov K.N. Control of pneumatic actuated stopcocks at gas facilities industry ISSN 1561-1531. Industrial control systems and controllers. 2007. No. 03, pp. 45-47, Appendix 1. The structural diagram of MBU "Crane-2" is presented on page 46). MBU "Crane-2" (hereinafter MBU) provides control of two cranes by means of a controller, to which a power module and an interrogation and diagnostics circuit of crane end switches are connected separately for each crane.

The following describes the control of one crane.

The MBU controller, after supplying it with a supply voltage of +24 V, executes a control program in an endless cycle. In a cycle, the following actions are performed sequentially:

- determination of the current position of the crane;

- reception for the execution of the command to the crane;

- issuing a command to the crane;

- interrogation and program diagnostics of crane solenoids;

- change of indication of crane status.

Limit switch polling circuitry controls:

- opening and closing of the crane;

- open circuit of the limit switch;

- filtering input impulse noise signals.

The power supply to the crane limit switch circuits is produced by two separate internal +12 V power supplies with galvanic isolation.

Voltage (110 V) to the crane solenoid is supplied by the MBU power module, which consists of three identical control, protection and diagnostic channels. The electrical circuit of such a channel includes, among other things, a power switch and a circuit control circuit of the solenoid circuit for open and short circuit.

Switching of the crane occurs after applying 110 V voltage to the solenoid of the operating valve through an open power switch (transistor).

To diagnose and control the break of the solenoid circuit or the presence of a short circuit in the standby mode, when the solenoid is not energized +110 V, the monitoring and diagnostics circuit provides a current of about 8 mA to the solenoid circuit from the built-in +12 V. Two circuits are provided in the circuit individual exit. If the solenoid circuit is normal, then a low level signal is present at the first output; if the signal is high, the solenoid circuit is interrupted. A low level signal will appear at the second output of the control circuit if there is a short circuit in the solenoid circuit, which is determined by the drop in the resistance of the solenoid circuit below 100 Ohms (the resistance of the solenoid coil is 600 Ohms).

The known method of controlling cranes using MBU is not reliable enough, due to the lack of neutralization of the false inclusion of the solenoid valve solenoid valve, as well as the possible failure of the control power switch (transistor).

A known method of controlling a crane with the power element SE-1 (hereinafter referred to as the SE-01 module) using telecontrol commands (hereinafter referred to as TU) according to a certain algorithm depending on the position of the crane, determined by the state of the contacts of the position sensors (Force element SE-01. Operation manual ZI5 .108.013 RE, pp. 3, 5, 7-9, Appendix 2. The composition of the SE-01 module is presented on page 5). When implementing the method, the state of the TU circuits and the position sensor circuits are monitored.

The state of the control circuits is determined by alternately monitoring the current in each circuit of the control unit both in the control mode and in the control mode.

In the control mode, the current in the solenoid control circuit is determined by applying to it a control voltage of not more than 4 V. In this case, the current flowing through the solenoid is significantly less than the current of its inclusion (holding) and does not exceed 5 mA, and in the control mode, the current in the circuit is controlled the solenoid is determined by applying a working voltage of 110 V.

The indicated voltages are supplied by the microprocessor, and the current is measured using the current monitoring unit of the control circuits by converting the voltage signal into frequency and then by the microprocessor into a digital code. The obtained digital code values are compared with the minimum and maximum allowable values stored in the microprocessor memory. If the current value of the parameter is outside these limits, then the control circuit is considered faulty. If the current value of the parameter is within acceptable limits, then the control circuit is considered intact.

Remote control is carried out in two stages:

1 - preliminary management team;

2 - executive management team.

According to a preliminary command, one of three relays is activated: K8 opening relay, K9 closing relay or K10 lubrication relay. After receiving a preliminary command, the module checks the possibility of switching on the selected relay. In the case when the contacts of all the remaining relays are open, the selected relay is switched on and its control circuit is monitored, as described above in the control mode. If the control circuit is OK, the preliminary command is considered complete.

Then, by an executive command, the K7 power relay is turned on and the supply voltage (110 V) is supplied through the contacts of the relay, switched on by a preliminary command, to the corresponding solenoid. After receipt of the executive command, the state of the relay is first checked so that only one relay (opening, closing, lubrication) is currently turned on. If at the same time two relays turn on, the module is considered faulty. Then the relay control circuit is checked as described above. If the control circuit is operational, the executive command is considered complete.

After passing the executive command, the SE-01 module constantly monitors the status of the position sensors.

To control the crane, position sensors with normally closed contacts are used, which are monitored using the position sensor monitoring unit.

If the opening solenoid is turned on, the SE-01 module scans the contact of the opening sensor until it switches to the open state, which corresponds to the opening of the crane. If voltage is applied to the closing solenoid, the SE-01 module scans the contact of the closing sensor until it switches to the open state, which corresponds to closing the valve. If voltage is applied to the grease solenoid, the module does not scan the state of the contacts of the position sensors.

The disadvantages of this method are:

- the absence of parallel verification of the control circuits of the solenoids, as a result of which during the operation of one of them when switching the crane it is impossible to determine the occurrence of violations in the control circuits of other solenoids;

- the unreliability of the control method, due to the lack of neutralization of the false inclusion of the electromagnetic valve of the crane and the failure of the relay control solenoid valves.

The prototype of the proposed technical solution is a method for remote control of pipeline valves, implemented in the patent for invention No. 2525043 RU (IPC F16K 31/12, publ. 08/10/2014) "Method for continuous monitoring of the integrity of the control circuits of pipeline valves and the scheme for its implementation." When implementing this known method, the signs of the method for remote control of pipeline valves are used, including the mode of continuous monitoring of the integrity of the control circuits of the valves of pipelines, the control mode, the selection of the control circuit, the formation of a signal about the integrity of the circuit and the electrical control command, and the control of the valve. The control is carried out by measuring the voltage at the ends of a normally open contact of the solenoid valve control relay through the telemeasurement module of the telemechanics controller. The signal about the integrity of the circuit is formed by comparing this voltage with the voltage value of the threshold of the controller, stored in the controller memory.

The known method is implemented by means of a circuit that includes a linear telemechanics controller, a power source and a crane with solenoid valves connected by control circuits. The linear telemechanics controller contains telecontrol modules for electromagnetic valves and control elements in the form of telemetry modules with converters. The converter matches the value of the measured voltage with the size and type of the input signal of the telemetry module.

A sign of serviceability or malfunction of the control circuits of the electromagnetic valves in the known method is the presence or absence of voltage on the normally open contacts of the control relay. The voltage at the contacts is rated if the power supply is working properly, the control circuits and the solenoid valve winding are open, the relay contact is not stuck or burned.

The voltage at the contacts will be zero in the event of a malfunction of the power supply, open control circuits or the winding of the electromagnetic valve, sticking of the relay contact.

The specified crane control method operates according to the following algorithms (using the Open control channel as an example):

1. The period of the control regime. The crane (7) is closed, the control circuit is operational. In this case, a voltage of 110 V is present at the ends of the contact (8) of the telecontrol module relay (6), since the contact (8) is in the open position. Voltage 110 V is generated by a power source (14) to power the solenoid valves (9) and (11);

2. Voltage 110 V from the contact (8) of the telecontrol module relay (6) is supplied to the input of the converter (13). Voltage 110 V is converted by the converter (13) into a signal - “unified signal 0-10 V” and fed to the input of the telemetry module (3);

3. If there is a signal “unified signal 0-10 V” within 7-10 V at the input of the telemetry module (3), the controller (2) generates a signal about the serviceability of the control circuits;

4. The control circuits are OK, the circuit is waiting for the crane control command (7) - “Open”;

5. During the period of the crane control mode (7) “Open”, the controller (2) generates a signal to open the crane (7). The telecontrol module (6) will close the contact (8) and the “Open” solenoid valve (9) will work, the valve (7) starts to open;

6. A closed contact (8) will reduce the voltage of 110 V to zero at its ends and at the input of the converter (13);

7. At the output of the converter (13) and the input of the telemetry module (3), the signal - “unified signal 0-10 V” will decrease to zero. The telemetry module (3) during this period transmits to the controller (2) a zero signal value.

In the period of the crane control mode, unlike the control mode, the controller (2) does not generate a signal about the malfunction of the control circuits, since the contact closure (8) is a necessary condition during the period of the crane control mode (7);

8. A decrease in voltage of 110 V during the period of crane control mode (7) signals the normal operation of the telecontrol module (6) and its contact (8).

9. After the valve (7) opens, the controller (2) removes the signal to open the valve (7) and the telecontrol module (6) opens the contact (8), at the ends of which voltage 110 V appears again;

10. According to the newly appeared voltage of 110 V at the ends of the contact (8), the controller (2) will again generate a signal about the serviceability of the control circuits in accordance with paragraphs. 1-4 of this algorithm;

11. Type I malfunction detection. If the valve (7) opens, the controller (2) receives a signal to open the valve (7), but the contact (8) does not open (contact (8) burned or stuck), then the ends do not have a voltage of 110 V. At the input of the converter (13), the voltage will also be zero;

12. At the output of the converter (13) and the input of the telemetry module (3), the signal “unified signal 0-10 V” will be zero. The telemetry module (3) in this case transmits to the controller (2) the zero signal value and the controller (2) generates a signal about the failure of the crane control circuit;

13. Type II fault detection. If a malfunction occurs in the 110 V power supply unit (14), the control circuits or the solenoid valve coil (9) breaks, the voltage at terminal (8) will become zero. A signal is generated about a malfunction of the crane control circuit in accordance with paragraph 12 of this algorithm;

14. Fault detection type III. During the period when the controller (2) sends the crane control command (7) “Open”, the voltage at the ends of the contact (8) did not change, due to a malfunction of the telecontrol module (6) or contact (8), the controller (2) generates a signal about malfunction of the crane control circuits.

The crane is controlled by the Close command in the same way as described above, with circuit elements related to the Close control channel.

The prototype has the following disadvantages:

- the solenoid valve of the crane is controlled by the “Open” or “Close” command using one control relay, which can lead to the crane being turned on by a false control command, or, in the event of a control relay failure, the crane switching command will not be executed;

- the use of a voltage converter and a telemetry module to obtain a signal on the position of the contacts of the control relay creates an additional factor in the occurrence of a malfunction, because this solution uses double signal conversion and the telemetry module is a complex multicomponent device;

- during the crane control period, the controller does not generate a signal about the malfunction of the control circuits, the normal operation of the telecontrol module is judged only by a decrease in voltage of 110 V, which complicates the control process.

The objective of the invention is to increase the reliability of crane control and, as a consequence, increase the trouble-free operation of main pipelines.

EFFECT: increased reliability of crane control by applying the principle of redundancy both with respect to the number of relays controlling the crane and with respect to the device of these relays, as well as due to the functionally simple organized monitoring of the operability of crane control circuits.

The principle of redundancy is that in order to increase the reliability of technical devices, additional elements are introduced into their composition compared with the minimum necessary to perform the specified functions.

Monitoring the operability of the crane control circuits includes monitoring the DC voltage source to power the solenoid valves, monitoring for open circuits, shorting or sticking of the contacts of the crane control relay.

The technical result is achieved by the fact that in the remote control method of the pneumatic actuating valve of the main pipeline, which includes constant monitoring of the operability of the valve control circuits, selecting a control circuit, determining the operability of the control circuits by comparing the data obtained during the control with the data stored in the controller memory, generating an electrical control command by relays with normally open contacts and the control of the crane, according to the invention, I control each solenoid valve of the crane simultaneously has at least two of three relays, each of which closes two of the three parallel sections of the control circuit of this valve, and on each section there are two pairs of contacts from different relays, while the operation of the crane control circuits is monitored continuously reading logical signals from optocouplers connected to normally open relay contacts, and operability is determined by the combination of read logical signals.

The invention is illustrated by drawings. In FIG. 1 shows a diagram for implementing the proposed method for remote control of a pneumatic pipeline valve, where the following positions are indicated:

1 - controller, where DI1-DI12 - inputs of logical signals from optocouplers 10-21;

2 - a constant voltage source;

3 - crane control system 34;

4, 5, 6 - relay control solenoid valve 35 valve control circuit "Open";

7, 8, 9 - relay control solenoid valve 36 of the crane control circuit "Close";

from 10 to 15 - optocouplers for continuous monitoring of the operability of the “Open” crane control circuit;

from 16 to 21 - optocouplers for continuous monitoring of the operability of the crane control circuit "Close";

from 22 to 33 - a resistor;

34 - pneumatic actuated valve;

35 - solenoid valve valve control circuit "Open";

36 - solenoid valve valve control circuit of the valve "Close";

37 - communication interface with the control system 3 of the crane 34.

The essence of the proposed method in terms of applying the principle of redundancy is that the electromagnetic valve is controlled simultaneously by three relays, each of which has two pairs of normally open contacts.

The electromagnetic valve 35 is controlled by:

- relay 4 with pairs of contacts K4.1 and K4.2;

- relay 5 with pairs of contacts K5.1 and K5.2;

- relay 6 with pairs of contacts K6.1 and Kb.2.

The electromagnetic valve 36 is controlled by:

- relay 7 with pairs of contacts K7.1 and K7.2;

- relay 8 with pairs of contacts K8.1 and K8.2;

- relay 9 with pairs of contacts K9.1 and K9.2.

Further, for simplicity of presentation, the term “pair of contacts” can be replaced by “contacts”.

Solenoid valve 35 or 36 can be turned on only if three or two of any control relays are activated. This avoids the erroneous inclusion of the crane 34 in the event of failures or interference in the form of single control signals from the control system 3, including one relay, and maintains the operability of the control circuits in case of failure of one of the three relays, which increases the reliability of crane control.

To implement the control of the crane 34 through three relays in the control circuits of the electromagnetic valves 35 and 36, three parallel, functionally identical and independent from each other sections of the circuit are organized, each of which is designed to control the electromagnetic valve. In each section, the control circuit is closed by two pairs of contacts from different relays, which increases the reliability of crane control. So if one of the three relays fails, the solenoid valve will be controlled in a section of the circuit where there are no contacts of this relay, and if one of the two contacts in any relay fails, the valve can be controlled in two other parts of the circuit where this contact is not.

Thus, the control circuit of the electromagnetic valve 35 of the crane 34 includes:

- DC voltage source 2;

- relay 4, 5, 6 control the electromagnetic valve 35;

- a section of the circuit with contacts K4.1 (relay 4) and K5.1 (relay 5);

- a section of the circuit with contacts K5.2 (relay 5) and K6.1 (relay 6);

- a section of the circuit with contacts K4.2 (relay 4) and Kb.2 (relay 6).

- the electromagnetic valve 35;

- controller 1;

- control system 3.

The solenoid valve control circuit 36 of the crane 34 includes:

- DC voltage source 2;

- relay 7, 8, 9 control the electromagnetic valve 36;

- a section of the circuit with contacts K7.1 (relay 7) and K8.1 (relay 8);

- a section of the circuit with contacts K8.2 (relay 8) and K9.1 (relay 9);

- a section of the circuit with contacts K7.2 (relay 7) and K9.2 (relay 9).

- electromagnetic valve 36;

- controller 1;

- control system 3.

Hereinafter, for ease of presentation, sections of the chain will be designated as section K4.1-K5.1, section K5.2-K6.1, etc.

The operability control of the crane control circuits 34 is organized on the principle of converting the voltage at the ends of a normally open relay contact into a logic signal, which is read by controller 1. For this, an optocoupler is connected to each pair of normally open contacts of the control relay. If the control circuits of the crane 34 are operational, then when the test current passes through the optocoupler (the contacts are open, control of the control circuits), the logic 1 signal is sent to the controller 1 from the optocoupler output, and if there is no current (the contacts are closed, the crane control), the logic zero signal. The presence of signals opposite to those mentioned above will indicate the presence of malfunctions in the crane control circuits in the form of open circuits, shorting or sticking of the contacts of the control relay, or a failure of the DC voltage source 2. The types of malfunctions, depending on the combination of read logic signals, will be discussed below. when describing the implementation of the proposed method.

The test current sufficient to turn on the optocoupler is about (1-5) mA, which is much less than the response and holding current of electromagnets 35 and 36 (usually more than 500 mA). The required value of the test current is provided by resistors connected to the inputs of the optocouplers.

These elements are combined as follows.

In the control circuit of the solenoid valve 35:

- contacts K4.1, optocoupler 10 with resistor 22;

- contacts K4.2, optocoupler 11 with a resistor 23;

- contacts K5.1, optocoupler 12 with resistor 24;

- contacts K5.2, optocoupler 13 with resistor 25;

- contacts K6.1, optocoupler 14 with resistor 26;

- contacts K6.2, optocoupler 15 with a resistor 27.

In the control circuit of the solenoid valve 36:

- contacts K7.1, optocoupler 17 with a resistor 29;

- contacts K7.2, optocoupler 16 with resistor 28;

- contacts K8.1, optocoupler 19 with resistor 31;

- contacts K8.2, optocoupler 18 with resistor 30;

- contacts K9.1, optocoupler 21 with resistor 33;

- contacts K9.2, optocoupler 20 with resistor 32.

Thus, the controller 1 continuously receives logical signals about the status of the control circuits of the crane 34 during the entire control process - when monitoring the selected control circuit "Open" or "Close", when generating an electrical control command and when controlling an electromagnetic valve, in parallel checking the operability of a circuit that is not involved in controlling the selected solenoid valve.

Controller 1 compares the readout combinations of logical signals from optocouplers 10-21 with the combinations of test logic signals stored in its memory and outputs the test result in the form of digital codes containing information about the health of the control circuits to control system 3 via interface 37 to generate the Open command or "Close."

The inclusion of the electromagnetic valve is possible in the presence of signals of a logical unit from at least two optocouplers connected to two pairs of contacts of one section of the valve control circuit. In the “Open” control circuit of the crane 34, this is section K4.1-K5.1, or section K5.2-K6.1, or section K4.2-K6.2. In the crane control circuit of the crane 34 “Close” is a section K7.1-K8.1, or a section K8.2-K9.1, or a section K7.2-K9.2.

The control system 3, depending on the selected control circuit "Open" or "Close", and also depending on the digital code received from controller 1, generates and transmits at the interface 37 to controller 1 simultaneously two or three signals for switching on two or three, respectively relay of the selected crane control circuit 34:

- with the command “Open” - “Open No. 1” for relay 4, “Open No. 2” for relay 5, “Open No. 3” for relay 6;

- with the command “Close” - “Close No. 1” for relay 7, “Close No. 2” for relay 8, “Close No. 3” for relay 9.

To control the crane 34, at least two relays form an electrical control command by closing the contacts of operable sections of the selected control circuit.

The arrangement in the diagram of FIG. 1 control system 3 and relay 4-9 is conditional, options may be different, depending on the specific conditions of use of the method.

Thus, the monitoring of the operability of the crane control circuits is functionally organized simply, without taking any measurements and using complex devices that create an additional factor in the occurrence of a malfunction, while the logical signals about the state of the circuits enter the controller continuously. The listed advantages provide reliable constant control of both control circuits throughout the entire control process and increase the reliability of crane control.

The implementation of the method for remote control of a pneumatic actuated valve of the pipeline is as follows: with constant monitoring of the operability of the control circuits of the valve 34, an electric command "Open" or "Close" of the valve 34 is formed and its execution is carried out.

When monitoring the operability of control circuits before switching the crane 34, the relay contacts 4, 5, 6, 7, 8, 9 are in the initial state, i.e. normally open, and from the voltage source 2 through the electromagnets of the valves 35 and 36 passes the test current.

Through the valve electromagnet 35, current flows through the circuit - plus voltage source 2; parallel sections of connecting pairs of optocouplers: 10 and 12 in the section K4.1-K5.1, 13 and 14 in the section K5.2-K6.1, 11 and 15 in the section K4.2-K6.2; an electromagnet 35; minus voltage source 2.

Through the valve solenoid 36, current flows through the circuit - plus voltage source 2; parallel sections of connecting pairs of optocouplers: 16 and 20 of section K7.2-K9.2, optocouplers 18 and 21 of section K8.2-K9.1, optocouplers 17 and 19 of section K7.1-K8.1; an electromagnet 36; minus voltage source 2.

The magnitude of the test current is significantly less than the response and holding current of the electromagnets 35 and 36, the electromagnets of the valves 35 and 36 are not turned on, and from the outputs of the optocouplers 10-21 to the controller 1 through the inputs DI1-DI12 logic signals continuously depend on the position of the contacts to which optocouplers 10-21 are connected.

The read combinations of logical signals from the optocouplers 10-21, the controller 1 compares with the stored combinations of test logic signals stored in its memory.

As a result of the comparison, there may be the following results indicating the operability of control circuits:

- the control circuit of the solenoid valve 35 is operational if a signal of a logical unit is received from all optocouplers 10-15 (all optocouplers 10-15 are turned on) in the absence of signals "Open No. 1", "Open No. 2", "Open No. 3";

- the control circuit of the electromagnetic valve 36 is serviceable if a logical unit signal is received from all optocouplers 16-21 (all optocouplers 16-21 are turned on) in the absence of signals "Close No. 1", "Close No. 2", "Close No. 3";

- open circuit (or failure) of voltage source 2, if logical zero signals are received from all optocouplers 10-21 (all optocouplers 10-21 are disabled);

- open circuit in the circuit of the electromagnetic valve 35, if from all optocouplers 10

- 15 a logical zero signal is received (all optocouplers 10-15 are disabled), and a logic one signal is received from at least one of the optocouplers 16-21 (one of the optocouplers 16-21 is turned on);

- open circuit in the circuit of the electromagnetic valve 36, if from all optocouplers 16

- 21 received a logical zero signal (all optocouplers 16-21 are disabled), and a signal of a logical unit was received from at least one of the optocouplers 10-15 (one of the optocouplers 10-15 is turned on);

- sticking (closing) of contacts K4.1 of relay 4, if a logic zero signal is received from optocoupler 10 (optocoupler 10 is disconnected) in the absence of the “Open No. 1” signal;

- sticking (closing) of contacts K4.2 of relay 4, if a logic zero signal is received from optocoupler 11 (optocoupler 11 is disconnected) in the absence of the “Open No. 1” signal;

- sticking (closing) of contacts K5.1 of relay 5, if a logic zero signal is received from optocoupler 12 (optocoupler 12 is disconnected) in the absence of the “Open No. 2” signal;

- sticking (closing) of contacts K5.2 of relay 5, if a logic zero signal is received from optocoupler 13 (optocoupler 13 is disconnected) in the absence of the “Open # 2” signal;

- sticking (closing) of contacts K6.1 of relay 6, if a logic zero signal is received from optocoupler 14 (optocoupler 14 is disconnected) in the absence of the “Open No. 3” signal;

- sticking (closure) of the contacts Kb 2 of relay 6, if a logical zero signal is received from optocoupler 15 (optocoupler 15 is disconnected) in the absence of the “Open No. 3” signal;

- sticking of contacts K7.1 of relay 7, if a logic zero signal is received from optocoupler 17 (optocoupler 17 is disconnected) in the absence of the “Close No. 1” signal;

- sticking of contacts K7.2 of relay 7, if a logic zero signal is received from optocoupler 16 (optocoupler 16 is disconnected) in the absence of the “Close No. 1” signal;

- sticking of contacts K8.1 of relay 8, if a logic zero signal is received from optocoupler 19 (optocoupler 19 is disconnected) in the absence of the “Close No. 2” signal;

- sticking of contacts K8.2 of relay 8, if a logic zero signal is received from optocoupler 18 (optocoupler 18 is disconnected) in the absence of the “Close No. 2” signal;

- sticking of contacts K9.1 of relay 9, if a logic zero signal is received from optocoupler 21 (optocoupler 21 is disconnected) in the absence of the “Close No. 3” signal;

- sticking of contacts K9.2 of relay 9, if a logic zero signal is received from the optocoupler 20 (the optocoupler 20 is disconnected) in the absence of the “Close No. 3” signal.

The controller 1 transmits to the control system 3 via interface 37 the indicated results of the control circuit control of the electromagnets 35 and 36 in the form of a digital code.

The control system 3, depending on the digital code received from the controller 1, transmits two or three signals simultaneously to the controller 1 and to the relay of the selected control circuit via an interface 37 to generate an electric control command “Open” or “Close” and control the crane 34.

The algorithm for generating these commands is the same for both control circuits.

1. The control system 3 gives out to controller 1 via interface 37 and to relay 4, 5, 6 three simultaneous signals for switching on the relay - “Open No. 1” for relay 4, “Open No. 2” for relay 5, “Open No. 3” for relay 6.

2. Relays 4, 5, 6 form the “Open” electrical command by closing the corresponding contacts K4.1, K4.2, K5.1, K5.2, K6. 1, K6.2. As a result, the current passes through the circuit - plus voltage source 2; closed contacts in areas K4.1-K5.1, K5.2-K6.1, K4.2-K6.2; valve electromagnet 35; minus the voltage source 2 and the valve 34 switches to the "Open" state.

3. When the contacts K4.1, K4.2, K5.1, K5.2, K6.1, K6.2 are closed, the optocouplers 10-15 are turned off, which registers the controller 1 by the state of the DI1-DI6 signals received from the corresponding outputs optocouplers 10-15, and a signal about the start of the Open command is issued to the control system 3 via interface 37.

4. At the end of the switching period of the crane 34, the control system 3 stops issuing signals "Open No. 1", "Open No. 2", "Open No. 3" and the controller 1 continues to monitor the status of the crane control circuits.

5. If the “Open No. 1” signal is not received or relay 4 fails, its contacts K4.1, K4.2 will remain open, and the optocouplers 10, 11 switched on.

In this case, the signals “Open No. 2”, “Open No. 3” will turn on relays 5 and 6, which are closed by contacts K5.1 and K5.2, K6.1 and K6.2. However, due to open contacts K4.1 and K4.2, the current will not go through sections K4.1-K5.1 and K4.2-K6.2. As a result, the current will pass through the circuit - plus voltage source 2; closed contacts of the site K5.2-K6.1; valve electromagnet 35; minus the voltage source 2 and the crane 34 will begin switching to the "Open" state.

6. If the “Open No. 2” signal is not received or relay 5 fails, its contacts K5.1, K5.2 remain open, and the optocouplers 12, 13 are turned on.

In this case, the signals “Open No. 1”, “Open No. 3” will turn on relays 4, 6, which are closed by contacts K4.1 and K4.2, K6.1 and K6.2. However, due to open contacts K5.1 and K5.2, the current will not go through sections K4.1-K5.1 and K5.2-K6.1. As a result, the current will pass through the circuit - plus voltage source 2; closed contacts of the site K4.2-K6.2; valve electromagnet 35; minus the voltage source 2 and the crane 34 will begin switching to the "Open" state.

7. If the “Open No. 3” signal is not received or relay 6 fails, its contacts K6.1, K6.2 will remain open, and the optocouplers 14, 15 will be turned on. In this case, the signals “Open No. 1”, “Open No. 2” will turn on relays 4, 5, which are closed by contacts K4.1 and K4.2, K5.1 and K5.2. However, due to open contacts K6.1 and K6.2 in areas K5.2-K6.1. and K4.2-K6.2 the current will not go. As a result, the current will pass through the circuit - plus voltage source 2; closed contacts of the site K4.1-K5.1; valve electromagnet 35; minus the voltage source 2 and the crane 34 will begin switching to the "Open" state.

The above examples show how the organization of the control circuits of the crane 34 according to the proposed method provides reliable control of the solenoid valve by means of two relays in the event of a malfunction of the third relay. The channels of the control circuit in which the faulty contacts are located are excluded from the control process, which increases the reliability of crane control.

From the above examples it is clear that reliable control of the crane is also possible in the following cases:

1. only one pair of contacts of one relay is faulty or two relays have one pair of contacts located on one section of the control circuit (two sections of the control circuit will participate in the control of the electromagnetic valve, a section with a faulty pair or two pairs of contacts will not participate, it will be excluded from the control circuit);

2. two relays have one pair of contacts faulty located on different sections of the control circuit (only one section of the control circuit will participate in the control of the solenoid valve, sections with faulty pairs of contacts will not participate, they will be excluded from the control circuit).

The organization of the control circuits of the crane 34 according to the proposed method also excludes the inclusion of the electromagnetic valve 35 through only one relay, i.e. upon issuing by control system 3 only one of the three signals “Open No. 1”, “Open No. 2”, “Open No. 3”. For example, upon receipt of only one signal “Open No. 1”, relay 4 will turn on and close contacts K4.1 and K4.2. The contacts of unconnected relays 5 and 6 will remain in a normally open state, in the control circuit all three sections K4.1-K5.1, K5.2-K6.1 and K4.2-K6.2 will be open, which means that the electromagnetic control circuit valve 35 will be open. Similarly, this circuit will be opened when only one relay 5 is turned on by the “Open No. 2” signal or when only one relay 6 is turned on by the “Open No. 3” signal.

Thus, the neutralization of the false switching of the pneumatic actuated valve is ensured in case of a malfunction of the control system 3, which increases the reliability of control of the valve.

The formation of the electric control command "Close" of the crane 34 occurs similarly to the formation of the command "Open". This involves the elements of the control circuit of the solenoid valve 36, which have been described above.

Compared with the known solutions, the proposed method provides a significant increase in the reliability of controlling a pneumatic actuated valve and, as a result, increases the trouble-free operation of main pipelines.

This technical solution performs the task and has the technical result of increasing the reliability of controlling a pneumatic actuated valve due to the following:

- the crane is controlled by three relays;

- each relay has two pairs of normally open contacts;

- the control circuit of each solenoid valve is organized so that it contains three parallel, functionally identical and independent from each other sections;

- in each section, the circuit is closed by two pairs of contacts from various relays;

- reliable control of the crane is possible in the event of a malfunction of one relay or, in various versions, in the event of a malfunction of individual relay contacts;

- crane control is not possible with only one relay;

neutralization of false switching of the pneumatic actuated valve is ensured in case of a malfunction in the control system;

- control of the operability of the circuits is carried out using optocouplers connected to each pair of relay contacts;

- during control there are no measurements and the use of complex devices;

- logical signals about the state of the circuits are supplied to the controller continuously.

Claims (1)

A method for remote control of a pneumatic actuating valve of a main pipeline, which includes constant monitoring of the operability of valve control circuits, selection of a control circuit, determining the operability of control circuits by comparing the data obtained during control with data stored in the controller’s memory, generating an electrical control command by means of a relay with normally open contacts and implementing crane control, characterized in that they control each solenoid valve of the crane at least two of the three relays, each of which closes two of the three parallel sections of the control circuit of this valve, and on each section there are two pairs of contacts from different relays, while the operability of the crane control circuits is monitored by continuously reading logical signals from optocouplers connected to normally open relay contacts, and operability is determined by a combination of read logic signals.

Images