JPS63312581A - Engaging device in emergency shutdown valve or the like - Google Patents

Abstract

PURPOSE:To increase the reliability of engagement and to facilitate operation by providing an engaging portion on a piston rod, engaging a stopper mounted on the outside portion of a cylinder with the engaging portion, and moving the stopper by releasing means. CONSTITUTION:A piston 21 is inserted in the interior of a cylinder 20 in such a manner as to freely move vertically. A fixing member 25 having an engaging portion 24 is fixed to a piston rod 22 mounted on the piston 21. A stopper 26 is fixed to the lower end of the cylinder 20 by a pivot 29, and the stopper is engaged and disengaged with and from the engaging portion 24 by an electromagnetic solenoid 31. When the electromagnetic solenoid 31 is operated according to a signal, the stopper 26 is retreated to be disengaged, so that the piston rod 22 is lowered to close a valve. When the piston rod 22 is lifted, the stopper 26 is retreated by a pressing portion 23 of the fixing member 25, and subsequently, the engaging portion 24 is engaged with the stopper 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a locking device used in an emergency shutoff valve or the like.

[Conventional technology]

As an emergency shutoff valve, as shown in Fig. 3, levers 4 and 5 are attached to the valve shaft 3 of the valve body 2 provided in the pipe 1, and the valve body 2 is attached to one lever 4 in the closing direction. weight 6
In addition, the piston rod 8 of the cylinder 7 is connected to the other lever 5, and a solenoid valve (locking device) 10 is installed on the bypass pipe 9 of the cylinder 7 to prevent the pipe line l from being destroyed due to road construction etc. , the solenoid valve 10 is opened in response to a signal issued from a detector when an earthquake occurs, the weight 6 is released, and the conduit 1 is quickly closed (for example,
Publication of Utility Model Publication No. 61-39891), or one in which a locking device (not shown) is attached to the lever 4 of the weight 6 in a multi-stage combination of bell cranks, etc.
28919) is known.

[Problem that the invention seeks to solve]

The former type of locking device using a solenoid valve has the problem that the force of the weight 6 is always applied to the solenoid valve part, so the hydraulic oil tends to leak over time and the valve body tends to gradually close.
Furthermore, the latter type of locking device has a problem in that its structure tends to be relatively complicated.

[Means for solving problems]

In order to solve the above problems, the present invention inserts a piston equipped with a piston rod into a cylinder, provides a stopper on the outside of the cylinder, and provides an end of the piston rod that is taken out from the cylinder. a locking portion that locks onto the stopper to stop free movement of the piston rod; and a pressing portion that is moved together with the piston rod when the piston rod is locked and moves to retract the stopper from the locking position. Further, the stopper is provided with a release means for moving the stopper from the locking position and releasing the lock of the locking portion.

[Effect]

In a locked state in which the stopper locks the locking portion, when the release means is actuated to remove the stopper from the locking portion, the piston rod is released from the lock and moves relative to the cylinder. In addition, in order to put the piston rod in the locked state, move the locking part and the suppressing part together with the piston rod toward the stopper, push the stopper with the pressing part to retreat from the locked position, and move the locking part. After the stopper is placed in the locking position, the stopper is projected to the locking position to lock the locking portion.

〔Example〕

1 and 2 show an embodiment of the present invention, and reference numeral 20 in the figures indicates a cylinder. A piston 21 is inserted into the cylinder 20 so as to be able to move up and down. A piston rod 22 is attached below the piston 21, and the lower end of the piston rod 22 is exposed from the cylinder 20. A fixing member 25 having a locking portion 24 formed below the tapered pressing portion 23 is attached. Two left and right stoppers 26 for locking the locking portion 24 are attached to a bearing portion 28 of the support plate 27 attached to the lower surface of the cylinder 20 so as to be swingable left and right by a pivot shaft 29.

Further, an electromagnetic solenoid 31 is attached to the support plate 27 via a bracket 30, one end of a link 34 is connected to the tip of the movable core 32 by a pin 33, and the other end of the link 34 is connected to another pin. 35 is connected to the stopper 26. This electromagnetic solenoid 31 is
It is electrically connected to a well-known earthquake detector, pipe rupture detector (none of which are shown), etc., and when an abnormal situation such as an earthquake or pipe rupture occurs, the stopper 26 is automatically activated.
is rotated about the pivot 29 as a fulcrum to release it from the locking part 24, and constitutes a releasing means. In addition, electromagnetic solenoid 3
1 is attached with a return spring 36 that returns the movable core 32, which has been retracted by the excitation of the electromagnetic solenoid 31, to its original state.

Reference numeral 37 is a bypass pipe that interconnects the upper and lower parts of the cylinder 20, and a variable calibration valve 38 is provided in this pipe. Reference numeral 39 denotes a coupling fitting fixed to the lower end of the piston rod 22, and this coupling fitting 39 couples the piston rod 22 to the lever 5 shown in FIG. 3 and the like.

Next, the operation of the locking device in the emergency shut-off valve or the like according to the present invention constructed as described above will be explained by taking the emergency shut-off valve as an example.

FIG. 1 shows a state in which the locking portion 24 is locked by the stopper 26, and the valve body of the emergency shutoff valve opens the pipeline. In the above, when the electromagnetic solenoid 31 is actuated by a signal emitted from an earthquake detector or the like and the movable core 32 is retracted against the elasticity of the return spring 36, the stopper 26 is moved from the pivot 2
9 as a fulcrum to disengage from the locking portion 24 and release the restraint of the piston rod 22. Therefore, the piston rod 22 descends as shown in FIG. 2 to apply a weight to close the valve body. At this time, the throttle valve 38 regulates the flow rate of the hydraulic oil flowing from the lower side of the piston 21 to the upper side of the piston 21 through the bypass pipe 37, and appropriately controls the descending speed of the piston 21, that is, the closing speed of the valve body. do.

Furthermore, in order to lock the stopper 2.6 to the locking portion 24, the well-known return device provided in the emergency shutoff valve is operated to rotate the valve shaft, and the valve body is rotated in the opening direction. , causing the piston rod 22 to rise. As the piston rod 22 rises, the pressing part 23 that has risen together with the piston rod 22 and the locking part 24 inserts itself between the stoppers 26.26 and returns the stoppers 26.26 against the elasticity of the spring 36. It is evacuated from the locking position to the left and right, and the locking portion 24 is brought to the locking position. When the locking portion 24 is at the locking position and the suppressing portion 23 is removed from the stopper 26, the stopper 26 is rotated to the locking position by the movement of the movable core 32 by the return spring 36, and is locked as shown in FIG. The portion 24 is locked.

In addition, although the case of the locking device of an emergency shutoff valve was explained above, it is not limited to this, for example, a gate may be connected to the coupling fitting 39 of the piston rod 22, and it may be used as a gate opening/closing device. be able to. In addition, in the embodiment shown in the figure, the two stoppers 26 and 26 are
The structure is such that the stopper 26 and the electromagnetic solenoid 31 are individually moved by the electromagnetic solenoids 31 and 31.
The number of stoppers 26 used is not limited to the above, and two or more stoppers 26 may be moved by one electromagnetic solenoid 31. Furthermore, although the return spring 36 in the figure is provided between the main body of the electromagnetic solenoid 31 and the link 34, it may also be provided in other parts, such as between the bracket 30 and the stopper 26.

〔Effect of the invention〕

As explained above, in the locking device for an emergency shutoff valve or the like of the present invention, a piston equipped with a piston rod is inserted into a cylinder, a stopper is provided on the outside of the cylinder, and the piston is pulled out from the cylinder. A locking portion is provided at the end of the piston rod that locks with the stopper to stop free movement of the piston rod, and a locking portion that is moved together with the piston rod when the piston rod is locked and moves the stopper to a locking position. Since the stopper is provided with a release means for moving the stopper from the locking position and releasing the lock of the locking portion, the solenoid valve Unlike conventional pistons, there is no oil leakage and gradual movement of the piston, resulting in high locking reliability. In addition, by simply moving the piston rod, the stopper temporarily retracts from the locking position and automatically locks the locking portion, allowing one worker to perform the locking work. It has the advantages of simple structure and easy handling.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a locking device for an emergency shutoff valve or the like according to the present invention, and FIG. 2 is a cross-sectional view of the main parts in a locked state, and FIG. FIG. 3 is a front view of an emergency shutoff valve using a conventional locking device. 20...Cylinder, 21...Piston, 22...
Piston rod, 23...pressing part, 24...locking part, 26...stopper, 31...electromagnetic solenoid (release means).

Claims (1)

[Claims] A piston having a piston rod is inserted into the cylinder, and a stopper is provided on the outside of the cylinder, and the end of the piston rod that has come out from the cylinder is engaged with the stopper to stop the piston rod. The stopper is provided with a locking portion that stops free movement, and a pressing portion that is moved together with the piston rod when the piston rod is locked and moves to retract the stopper from the locking position. 1. A locking device for an emergency shutoff valve, etc., characterized in that a release means is provided for disengaging a locking portion by moving it from a locking position.