JPS5943278A - Gas hydraulic actuator - Google Patents

Abstract

PURPOSE:To prevent an actuator and a valve stem from being damaged, by surely stopping operation of the actuator when overload greater than a predetermined value is acted on the actuator serving to drive the valve stem. CONSTITUTION:A valve stem 3 is fixed by a key 41 to a boss 42 of an arm 31 of a Scotch yoke mechanism in an actuator body 30, and a detecting device 50 for detecting stress applied to the valve stem is mounted to a side of the boss. Torsional stress as detected is inputted to a control device 51, where the torsional stress is compared with a torque as previously set according to a designed permissible limit of the actuator. When the torsional stress becomes equal to this torque, a solenoid in operation is deenergized by a control circuit 52 to stop operation of the actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas hydraulic actuator for a gas pipeline.

A gas hydraulic actuator is known as an actuator for opening and closing a gas pipeline pole valve. FIG. 1 also shows the configuration of such a conventional gas-hydraulic actuator. The valve stem 3 of the pole valve body 2 installed in the pipeline 1 is rotated 90 degrees by the arm 31 of the Scotch choke mechanism included in the actuator body 30, and is opened and closed in accordance with the stroke of the piston rod 33. Note that the illustrated arm position indicates a state in which the pole valve is closed.

(above the pipeline across the valve body 2);
A pair of two-position solenoid valves 2 are connected to the shuttle valve 13 via a gas conduit 14 and housed in a housing 20.
1 and 22. The illustrated positions of these solenoid valves are neutral positions, and the gas conduit 14 is in a neutral position.・
[Hazoshi] I'm being pricked.

When a signal to open the valve is input to the terminal 6 of the solenoid valve 21, the solenoid valve 21S is energized, the spool moves, and the gas conductor τ(14 is connected to the gas-ura converter 23). A circuit is formed that connects with the gas conduit 15. As a result, the gas pressure of the bi-brine is transmitted to the gas-ura converter 23 through the gas conduit 14 and ]5, and pressurizes the hydraulic oil in the converter.

The pressurized hydraulic oil enters the cylinder 34 of the actuator body through the flow control valve 25 and the switching light 27, pushes the piston and piston rod 1ζ to the left, and rotates the valve stem by the arm of the SZ2 piston cock mechanism. and open the ball valve.

When the solenoid 22s of the other solenoid valve 22 is energized, the gas-to-ura converter 24 is similarly connected to the gas conduit 16.
The pressurized hydraulic oil in the converter is sent to the cylinder chamber 35 of the actuator body through the flow control valve 26 and the switching valve 27, and the piston rod I is connected to the cylinder chamber 71. to close the valve.

As shown in Figure 2 -4-, the valve stem 3 of the hole valve 2 is fixed to the post 42 of the Arno 31 of the Sunino-to-Y leak mechanism with the key 41 in the Akyuator. 〕'In Kunayue evening, i
Gas bundle, Hartz rotation ΦJ': 1. ', Required 1;, (According to the magnitude of the torque, set the actuator output or
When the FT capacity value is reached, a certain monthly 4Ji car (Kuri Month I
Ji Jru31-UC, by cutting the above-mentioned key, the activation 1. IυN1- to prevent damage due to overload of the motor.

However, in the manufacture of such keys, it is necessary to carefully press the
In reality, it is not easy to accurately determine when the actuator output reaches the set value, and the actuator output reaches the tolerance value of 1↓111. Nevertheless, sometimes; 1-- or cut 111
Sometimes things gradually change shape without changing. This θ
In the case of 几1, the actuator output 6j YI
The rotation of the L-'tT hull system is accurate, with no centering.
The degree of opening and closing of the valve decreases in proportion to the amount of deformation of the key. i
π-], the popor pal is not fully opened or closed C,
When opened, there is a valve for cleaning the waste pipe 1-
1. It gets caught and does not pass through, and when it is closed, it is not possible to completely seal the 1 (2! J scrap).

The present invention has been made in view of the above, and is capable of reliably stopping the operation of an actuator when a predetermined overload is applied to an actuator driven by a half-fabricated FA'i. According to 1. We present a gas-hydraulic actuator designed to prevent damage to the actuator and the actuator (1.1).

The gas hydraulic actuator according to the present invention connects gas from a gas pipeline to a solenoid valve through a gas conduit, and energizes or demagnetizes the solenoid of the solenoid valve. The gas in 11 is guided to the gas-ura converter through the valve, converted into hydraulic pressure, and sent to the hydraulic cylinder chamber of the actuator, which drives the valve stem of the valve installed in the gas pipeline to open and close the valve 4. In the hydraulic actuator, a detection device is installed to detect the amount of strain in the Haruts stem, and when the detected strain reaches a predetermined value corresponding to the allowable value of the actuator output, the solenoid of the solenoid valve is deenergized or energized. The invention is characterized in that the operation of the actuator can be stopped or stopped.

The invention will now be explained with reference to the drawings showing the embodiments.

FIG. 3 shows an embodiment of the Ballharz River gas hydraulic actuator according to the present invention, which has the same configuration as FIG. 1. The same reference numerals as in FIG. 1 indicate the same elements or structures as in FIG. 1 and operate in the same manner.

In the actuator body 30, if the post 42 of the arm 31 of the snip choke mechanism is fixed with the Nihalfram 3 or the key 41 (for example, if the valve stem is attached to the side of the post) A detection device for detecting stress costs 50 yen.

For example, a torsion stress (for example, Y) can be used as a detection device for the ILI control device 51. Here, the actuator's installation tolerance (iIlj is L, and is compared with the preset l-lux. When the torque becomes equal to this torque, the solenoid l of the solenoid valve is energized by the terminal 66, 2). Priority is given to the control circuit 52
This demagnetizes the operating solenoid F', thus stopping the actuator from operating.

For example, when the ball valve is in the opening operation, the control device demagnetizes the solenoid '21S of the solenoid valve 21, cuts off the connection between the gas conduit 14 and the gas conduit 15, and drains the hydraulic oil in the 'I converter 23. Stop applying pressure and remove the actuator body.＼
The supply of hydraulic oil is stopped, and the operation of the actuator is stopped.

As described above, according to the present invention, when the output of the actuator reaches a preset tolerance value in response to the stress in the valve stem, the solenoid valve for opening and closing the valve is demagnetized.
Since the operation of the actuator is stopped, the operation of the actuator can be reliably stopped with extremely high precision compared to the unstable conventional Acteco 4 actuator, which disconnects the key when an overload is applied to the actuator.

The above explanation was about ball valves, but in the case of Kate valves, the valve stem connected to the valve is driven up and down by an actuator to open and close the valve.
Therefore, instead of the torsional stress of the Ballharz valve stem, the tensile and compressive stress is detected, and this is set to J-me, and the ratio of the two-socket stress is a little 1. The above detected stress is the set value Q,
2-speed delivery 1-no and diagonal, stop operation of near 1-no machine.
1. Otherwise, it is clear that the opening and closing of the valve can be avoided in exactly the same way as in the case of the Ball-Harz valve, and the present invention is applicable to the Ball-Harz valve as well.
It applies to many people and costs 1 yen.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an example of a conventional waste oil pressure J-type actuator.
j1 side view and Fig. 3 are Gasura j1--1-(
There is a block diagram showing the main parts of Acti-1. 1... Vibration line, 2... Harz main body, 3... Valve stem, 11.12.14, I5.1G... Cas conduit, 21.21... Solenoid valve, 21s, 22 s -
Solenoid, 23.24... Kasuura converter, 30...
・Actuator body, 31... Arm, 34.35
... printer room, 41 ... key, 42 ... arm host, 50 ... detection device, 51 ... control device,
52...control circuit. -44;

Claims (1)

[Claims] (1) Connecting gas in a gas pipeline to a solenoid valve through a gas conduit, energizing or demagnetizing a solenoid included in the solenoid valve, and guiding the gas through the solenoid valve to a gas-oil converter to convert it into hydraulic pressure; In a gas hydraulic actuator that opens and closes the valve by driving the valve stem of a valve installed in a gas pipeline by sending hydraulic pressure to the cylinder chamber of the actuator, a detection device is provided to detect the amount of strain in the valve stem. , when the detected strain amount reaches a predetermined value corresponding to the allowable value of the actuator output,
A gas hydraulic actuator characterized in that the solenoid of the electromagnetic valve is demagnetized or excited to stop the operation of the actuator.