JPH10205643A - Opening control device for pipe passage opening/closing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the flow rate of a fluid, and form a control valve mechanism having a high reliability at low cost by switch-controlling a 4 port-3 position solenoid switching valve so as to match a setting signal outputted by valve opening setting means and a detecting signal with each other. SOLUTION: An opening control device comprises a 4 port-3 position solenoid switching valve 12A, an auxiliary hydraulic circuit provided in parallel with a main hydraulic circuit, valve opening detecting means 14, valve control means 15 for switching and controlling the valve 12A, a valve opening supporting system 17, a three way switching valve 18 for switching a hydraulic source, and a three way switching valve 19 for switching an oil tank. A setting signal outputted by the means 14 and a detecting signal outputted by valve opening detecting means 13 are compared with each other, an electric output according to its difference is generated from an output circuit, either one of solenoid coils in the valve 12A is selected, the electric output is applied. When both signals are matched with each other so as to eliminate its difference, the electric output is disconnected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully opened pipe through which a gas such as city gas and a liquid such as a chemical raw material and a chemical liquid flow.
More particularly, the present invention relates to an opening control device for a pipeline opening / closing mechanism which can control a flow rate of a fluid flowing in the pipeline by adding a hydraulic circuit and an electric circuit having a simple structure.

[0002]

2. Description of the Related Art Conventionally, as a pipeline opening / closing mechanism for fully opening / blocking the middle of a pipeline through which gas or liquid flows, there is a configuration shown in FIG. This device is connected to an opening / closing two-position operation hydraulic valve 2 provided in the middle of a pipeline 1 and an operation part 2A of the opening / closing two-position operation hydraulic valve 2, and converts linear motion into rotary motion to operate. A reciprocating hydraulic actuator 3 for transmitting to the section 2A, a hydraulic source 4, an oil tank 5, an opening switching valve 6, a closing switching valve 7, and an accumulator 9 are provided. A main hydraulic circuit that controls and opens and closes the two-position operation hydraulic valve 2. In addition, 8 in FIG. 3 is a throttle valve,
Reference numeral 10 denotes a check valve, and 11 denotes a pressure gauge.

Such a pipeline opening / closing mechanism merely opens or shuts off the pipeline 1, and cannot control the flow rate of the flowing fluid. It must be provided separately or an intermediate opening degree setting function must be added to the opening / closing two-position operation hydraulic valve 2. In any case, it is usually conceivable to add a general hydraulic servo valve.
The hydraulic servo valve is more expensive than the hydraulic valve 2 which is an open / close 2-position operation hydraulic valve having a simple structure. Also, if the hydraulic servo valve is installed in a hydraulic circuit, the hydraulic open / close 2-position operation hydraulic valve is required. The valve 2 requires little control to prevent dirt, dust, and deterioration of oil, which is said to be almost unnecessary, and takes time-consuming measures to prevent the servo valve, which is a precision part, from being damaged. Need to take.

[0004]

SUMMARY OF THE INVENTION The present invention has been accomplished as a result of addressing such a conventional problem. Therefore, an object of the present invention is to provide a simple and inexpensive member. The above problem is solved by adopting a simple means simply adding a solenoid valve and a general-purpose control means for controlling the solenoid valve, thereby enabling a flow rate control in addition to the operation of fully opening and shutting off. An object of the present invention is to provide a pipeline opening / closing mechanism capable of exhibiting multiple functions at low cost with high reliability.

[0005]

The present invention has the following configuration to achieve the above object. That is, the present invention controls an open / close two-position operation hydraulic valve interposed in a pipeline, a reciprocating hydraulic actuator connected to an operation unit of the open / close two-position operation hydraulic valve, and controls the hydraulic actuator. And a main hydraulic circuit for opening and closing the two-position operation hydraulic valve. The pipe opening and closing mechanism is provided in parallel with the main hydraulic circuit with a four-port three-position electromagnetic switching valve. A sub-hydraulic circuit for switching and connecting a power source to an open side port or a closed side port of the hydraulic actuator, and also for switching and connecting an oil tank to the closed side port or the open side port; Valve opening detecting means for detecting the opening of the valve, valve opening setting means for setting the opening of the opening / closing two-position operation hydraulic valve, and operating when the main hydraulic circuit is in a neutral state;
A valve control means for comparing the setting signal output from the valve opening setting means with the detection signal output from the valve opening detecting means and switching and controlling the four-port three-position electromagnetic switching valve so that the two signals coincide. It is characterized in that an opening control device is configured to include the same.

The present invention is also characterized in that in the opening control device described in the preceding paragraph, a switching means is provided for setting one of the main hydraulic circuit and the auxiliary hydraulic circuit to an operating state and the other to a neutral state.

[0007] The present invention also relates to an opening and closing device 2 provided in a pipeline.
A position operation hydraulic valve, a reciprocating hydraulic actuator connected to an operating portion of the open / close two-position operation hydraulic valve, and a main hydraulic circuit that controls the hydraulic actuator to open and close the open / close two-position operation hydraulic valve. A four-port two-position solenoid-operated switching valve interposed in the main hydraulic circuit and a valve opening detection sensor attached to the hydraulic actuator for detecting the opening of the two-position opening / closing hydraulic valve Means,
The valve opening setting means for setting the opening of the open / close two-position operation hydraulic valve is compared with a setting signal output from the valve opening setting means and a detection signal output from the valve opening detecting means. The main hydraulic circuit is controlled to switch to the open operation side or the close operation side so that the four-port two-position solenoid-operated directional control valve is controlled to switch the hydraulic power source to the open-side port or the close-side port of the hydraulic actuator. The opening control device is characterized by including valve control means for switching and connecting the oil tank to the closed port or the open port.

According to the present invention, a device having a simple structure of a four-port three-position solenoid-operated switching valve and a four-port two-position solenoid-operated switching valve and opening control by a control means having a simple circuit configuration for controlling the same are provided. By combining the devices, it is possible to provide a pipeline opening / closing mechanism that has multiple functions, has high reliability, and is easy to maintain.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are circuit diagrams according to the first and second embodiments of the present invention.

First, in FIG. 1, the pipeline opening / closing mechanism shown in FIG. 1 has the same structure as the conventional one shown in FIG. Hydraulic valve 2 and operating portion 2A of opening / closing 2-position operation hydraulic valve 2
And a reciprocating hydraulic actuator 3 which converts a linear motion into, for example, a rotary motion and transmits it to the operation unit 2A.
And a hydraulic source 4, an oil tank 5, an opening switching valve 6, a closing switching valve 7, and an accumulator 9. The hydraulic actuator 3 is controlled to open or close to open and close the open / close 2-position operation hydraulic valve 2. The main hydraulic circuit is provided with a throttle valve 8, a check valve 10, and a pressure gauge 11.

[0011] The pipe opening / closing mechanism is provided with an opening control device which characterizes the present invention. This opening control device has four
A sub-hydraulic circuit having a port 3 position electromagnetic switching valve 12A and provided in parallel with the main hydraulic circuit;
A valve opening setting means 14, a valve control means 15 for switching and controlling the four-port three-position electromagnetic switching valve 12A, a valve opening indicator 17, a three-way switching valve 18 for hydraulic pressure source switching, and an oil tank switching. And a three-way switching valve 19.

The 4-port 3-position electromagnetic switching valve 12A uses, for example, a double solenoid 3-position switching valve. The pressure source port P is connected to one of the switching ports B of the three-way switching valve 18 by an oil pipe, and the tank port is connected to the tank port. T is connected to one switching port B of the three-way switching valve 19 by an oil pipe, and one switching port A is branched to an oil pipe extending from the open port A of the hydraulic actuator 3 by an oil pipe having a throttle valve 20 interposed. The other switching port B is branched and connected to an oil pipe extending from the closing port B of the hydraulic actuator 3 by an oil pipe in which the throttle valve 20 is interposed.

The three-way switching valve 18 and the three-way switching valve 19 are, for example, single solenoid two-position switching valves. The three-way switching valve 18 is connected between the pressure source port P and the other switching port A by the pressure source of the main hydraulic circuit. The three-way switching valve 19 is provided between the tank port T and the other switching port A in the tank line of the main hydraulic circuit. The three-way switching valve 18 and the three-way switching valve 19 are constituent elements corresponding to the switching means in claim 2, wherein one of the main hydraulic circuit and the auxiliary hydraulic circuit is set to the operating state, and the other is set to the neutral state. Is controlled to be

The valve opening detecting means 13 is attached to the main body of the hydraulic actuator 3 comprising a double-acting hydraulic cylinder, for example, using a slide resistance type or magnetic type oscillator. Detects the amount of movement when moving between the fully closed position and the fully open position, and outputs an electric signal corresponding to the amount of movement. Since this output signal naturally corresponds to the displacement (rotation angle) of the operating part 2A of the two-position operation hydraulic valve 2 connected to the hydraulic actuator 3, it corresponds to the opening degree of the two-position operation hydraulic valve 2. Needless to say, the signal is output as the output signal.

The valve opening degree setting means 14 uses, for example, a potentiometer, and sets the opening degree of the two-position operating hydraulic valve 2, that is, the angle between the fully closed position (0 °) and the fully open position (90 °). The corresponding valve opening can be set as an electric signal.

Although the detailed circuit configuration is omitted, the valve control means 15 comprises a comparison circuit, an amplification circuit and an output circuit. The setting signal output by the valve opening setting means 14 and the valve opening detecting means The output circuit 13 compares the detected signal with the detection signal output by the output circuit 13 and outputs an electric output corresponding to the difference from the output circuit, selects one of the solenoid coils of the 4-port 3-position electromagnetic switching valve 12A and gives the electric output. Further, when the two signals coincide with each other and the difference is eliminated, the electric output is cut off.

The operation of the opening control device having such a configuration will be described below. When controlling the opening of the open / close two-position operation hydraulic valve 2 to a desired intermediate opening between the fully closed state and the fully opened state, the valve opening degree setting means 14 sets the intermediate opening degree in proportion to the opening degree such as 1 to 5V. After setting by the electric signal, first, the three-way switching valve 1
The 8 and the three-way switching valve 19 are switched such that the main hydraulic circuit is in the neutral state and the auxiliary hydraulic circuit is in the operating state, and then the valve control means 15 is operated.

The opening signal detected by the valve opening detecting means 13 is output from the standard signal converter 16 to 1 to 5 proportional to the opening.
The signal is converted into a standard signal such as V and input to the valve control means 15 via the valve opening indicator 17. Valve control means 15
On the other hand, since the opening setting signal from the valve opening setting means 14 is also input, the opening setting signal is compared with the opening signal. The 12A closed side coil (the right side coil in FIG. 1) is selected and excited. When the closed coil is excited, oil flows to the closed side (the left cylinder in FIG. 1) of the hydraulic actuator 3 and oil in the open cylinder is discharged to the outside.
By this operation, the opening / closing 2-position operation hydraulic valve 2 moves to the closing side so as to be the same as the opening degree setting signal. When the opening degree setting signal is equal to the actual opening degree, the closing coil is demagnetized, and the cylinder of the hydraulic actuator 3 stops while being filled with oil.

When the opening degree setting signal is large, the opening / closing two-position operation hydraulic valve 2 moves in the opening direction so as to be the same as the opening degree setting signal by performing an operation reverse to that described above. The valve control means 15 may be provided with a dead zone setting function for outputting an excitation signal to the 4-port 3-position electromagnetic switching valve 12A only when the difference between the opening degree setting signal and the actual opening degree signal is equal to or more than a certain value. The principle of operation is the same as that of the valve control means 15 described above, and such modifications are naturally included in the present invention.

Next, referring to FIG. 2, the second
The conduit opening / closing mechanism according to this embodiment is similar to the first embodiment shown in FIG. 1, and corresponding members are denoted by the same reference numerals. The features of the second embodiment are that a 4-port 2-position electromagnetic switching valve 12B is used instead of the 4-port 3-position electromagnetic switching valve 12A, and the auxiliary hydraulic circuit is omitted. The four-port two-position electromagnetic switching valve 12B is provided in the main hydraulic circuit. That is, as shown in FIG. 2, a 4-port 2-position solenoid-operated switching valve 1 comprising a solenoid 4-port on-off valve
2B connects two oil passages in the valve body to the opening port A of the hydraulic actuator 3 in the main hydraulic circuit and the opening switching valve 6
And the oil pipe connecting the closing port B of the hydraulic actuator 3 and the switching valve 7 for closing.

The operation of the opening control device having such a configuration will be described below. When controlling the opening of the opening / closing 2-position operation hydraulic valve 2 to a desired intermediate opening between the fully closed state and the fully opened state,
After the intermediate opening is set by the valve opening setting means 14, the valve control means 15 is operated.

The opening signal detected by the valve opening detecting means 13 is converted into a standard signal proportional to the opening by a standard signal converter 16 and passed through a valve opening indicator 17 to control the valve control means 1.
5 is input. On the other hand, since the opening setting signal from the valve opening setting means 14 is also input to the valve control means 15, the opening setting signal is compared with the opening signal. The coil of the position electromagnetic switching valve 12B is excited. At the same time as this excitation, the coil of the closing switching valve 7 is excited. When both coils are excited, oil flows to the closed side (the left cylinder in FIG. 1) of the hydraulic actuator 3 and oil in the open cylinder is discharged to the outside. By this operation, the opening / closing 2-position operation hydraulic valve 2 moves to the closing side so as to be the same as the opening degree setting signal. When the opening degree setting signal becomes equal to the actual opening degree, the coil of the 4-port 2-position electromagnetic switching valve 12B and the coil of the closing switching valve 7 are demagnetized, so that the cylinder of the hydraulic actuator 3 is stopped while being filled with oil. I do.

When the opening degree setting signal is large, 4 ports 2
The coil of the position electromagnetic switching valve 12B and the coil of the switching valve 6 for opening are excited, and this excitation causes the two-position operating hydraulic valve 2 to open and close.
Moves to the open side so as to be the same as the opening degree setting signal. In addition,
Similarly, in the case of full opening or full closing, it is possible to excite the coil of the 4-port 2-position electromagnetic switching valve 12B and the coil of the opening switching valve 6 or the coil of the closing switching valve 7 in the same manner.

In each of the embodiments described above, an example is shown in which a double-acting hydraulic cylinder is used as the hydraulic actuator 3. However, in the present invention, the hydraulic actuator 3 is limited to a double-acting hydraulic cylinder. It is needless to say that the present invention is not limited to this, and may be realized by another type of actuator such as a rotary hydraulic motor.

[0025]

The present invention is embodied in the form described above and has the following effects.

By combining an electromagnetic switching valve, which is a device having a simple structure, and valve control means having a simple circuit configuration with an existing pipeline opening / closing mechanism, a valve opening capable of adjusting a fluid flow rate in addition to a full opening / shutoff operation. The degree control can be performed, and a highly reliable control valve mechanism can be provided at low cost.

Furthermore, the management of the hydraulic system, particularly the management of the oil properties, is greatly simplified as compared with the system equipped with a servo valve, so that it is advantageous in terms of operating economy and the equipment cost is low. Together with this, the present invention has a great deal of versatility.

[Brief description of the drawings]

FIG. 1 is a hydraulic and electric circuit diagram according to a first embodiment of the present invention.

FIG. 2 is a hydraulic and electric circuit diagram according to a second embodiment of the present invention.

FIG. 3 is a hydraulic circuit diagram of a conventional pipeline opening / closing mechanism.

[Explanation of symbols]

1 ... pipeline, 2 ... opening and closing 2 position operation hydraulic valve, 2A ... operating section,
3 ... Hydraulic actuator, 4 ... Hydraulic source
5 oil tank, 6 switching valve for opening
7: switching valve for closing, 8: throttle valve,
9: accumulator, 10: check valve,
11 ... pressure gauge, 12A ... 4 port 3
Position electromagnetic switching valve, 12B ... 4 port 2 position electromagnetic switching valve, 13 ... valve opening detection means, 14 ... valve opening setting means, 15 ... valve control means, 1
6 ... Standard signal converter, 17 ... Valve opening degree indicator,
18 ... three-way switching valve, 19 ... three-way switching valve,
20 ... Throttle valve,

Claims (3)

[Claims] An opening / closing two-position operation hydraulic valve interposed in a pipeline, a reciprocating hydraulic actuator connected to an operating portion of the opening / closing two-position operation hydraulic valve, and controlling the hydraulic actuator A line opening / closing mechanism comprising a main hydraulic circuit for opening and closing the open / close 2-position operation hydraulic valve, a 4-port 3-position electromagnetic switching valve, provided in parallel with the main hydraulic circuit, And a sub-hydraulic circuit for switching and connecting the oil tank to the open side port or the close side port of the hydraulic actuator, and the hydraulic valve for opening and closing the two-position operation valve attached to the hydraulic actuator. Valve opening detecting means for detecting the opening of the valve, valve opening setting means for setting the opening of the open / close two-position operation hydraulic valve, and operates when the main hydraulic circuit is in a neutral state,
A valve control means for comparing the setting signal output from the valve opening setting means with the detection signal output from the valve opening detecting means and switching and controlling the four-port three-position electromagnetic switching valve so that the two signals coincide. An opening control device for a pipeline opening / closing mechanism, comprising: 2. The opening control device for a pipeline opening / closing mechanism according to claim 1, further comprising a switching means for setting one of the main hydraulic circuit and the auxiliary hydraulic circuit to an operating state and the other to a neutral state. 3. An open / close two-position operation hydraulic valve interposed in a pipeline, a reciprocating hydraulic actuator connected to an operation part of the open / close two-position operation hydraulic valve, and controlling the hydraulic actuator. A pipeline opening / closing mechanism comprising a main hydraulic circuit for opening and closing the open / close two-position operation hydraulic valve; a four-port two-position solenoid-operated switching valve provided in the main hydraulic circuit; Valve opening detecting means for detecting the opening of the two-position operating hydraulic valve, valve opening setting means for setting the opening of the open / close two-position operating hydraulic valve, setting signal output by the valve opening setting means and valve opening The main hydraulic circuit is switched to the open operation side or the close operation side so that the two signals coincide with each other by comparing the detection signal output from the degree detection means, and the four-port two-position electromagnetic switching valve is controlled to be switched. hand,
Valve control means for switchingly connecting a hydraulic pressure source to an open side port or a closed side port of a hydraulic actuator and also switchingly connecting an oil tank to a closed side port or an open side port. Degree control device.