JPS5814921B2 - Servo motor locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a locking device for a servo motor that operates a guide vane of a water turbine, for example.

[Prior art]

In the conventional servo motor locking device, as shown in FIG.
The pressure oil pipe 4 is cut off by the pressure oil pipe 4, and the pressure oil working under the piston 7 of the lock cylinder 6 passes through the pressure oil pipe 5 and is drained from the solenoid valve 1.

Therefore, the fork 9 connected to the piston 7 has a spring 8
The piston rod 12 of the servo motor 11 moves downward.
The servo motor 11 is fixed by contacting the stopper 10 provided at the surface a.

In addition, pressure oil is constantly supplied to the pressure oil pipe line 4, and the solenoid valve 1
When the pressure oil is energized, the pressure oil passes through the pressure oil pipe 5 and is applied to the lower side of the piston 7, pressing it upward.

13 and 14 are inlets for introducing pressure oil into the opening/closing side of the servo motor 11.

The above-mentioned solenoid valve 1 is designed to be deenergized when the servo motor 11 comes to the appropriate position by an electric signal, so if the solenoid valve 1 is operated by mistake or the power is lost, , while the piston 12 of the servo motor 11 is running,
Alternatively, the fork 9 and the stopper 10 may engage with each other at a position other than the specified position.

[Purpose of the invention]

The present invention was made in an attempt to improve the above problems.
The purpose of this is to securely hold the servo motor locking device in the open position when the locking device is opened.

[Summary of the invention]

That is, the present invention is characterized by a servo motor comprising a stopper provided on the piston rod of the servo motor, a locking device that fixes or releases the stopper by switching the fluid, and an electromagnetic fluid switching device that operates the locking device. In the lock device, a check valve provided in a lock release channel of the lock device that connects the lock device and the electromagnetic fluid switching device and a check valve that operates in response to the operation of the piston rod of the servo motor, and when the lock device is released, the check valve A locking device for a servo motor includes a switching valve that automatically switches a check valve by fluid pressure to a fluid source that holds the locking device in an open position.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

1 is a lock cylinder 6 provided on a servo motor 11
By pressing the plunger 2 inside the solenoid valve 1 overcoming the spring 3,
Pressure oil in the pressure oil line 4 flows into the lock cylinder 6 via the pressure oil line 22, the check valve 19, and the pressure oil line 25.

8 is a spring that presses the piston I inserted into the lock cylinder 6, and 9 is a fork 1 formed at the end of the piston.
2 is a piston of the servo motor 11, and this piston 12
A stopper 10 is provided on the piston rond, and when the servo motor 11 is locked, the fork 9 and the stopper 10 are engaged and the stopper 10 is fixed.

13 and 14 are pressure oil inlet ports provided at both ends of the servo motor 110; 15 is a switching valve that operates in response to the operation of the piston rond of the piston 12; It is connected to the piston rond of piston 12.

The check valve 19 is provided with a valve 20 and a spring 21 inside, and the check valve 19 also communicates with the switching valve 15 through a pressure oil line 23. Depending on the position of the pilot valve 17, the pressure oil line 23 is connected to a new pressure oil line. It is communicated with the pressure oil line 26 of the source.

24 is a pressure oil pipe line that communicates the lock cylinder 6 and the switching valve 15, and 5 is a pressure oil pipe line that communicates the switch valve 15 and the electromagnetic valve 1.

Now, FIG. 2 shows the locked state, and when trying to release it, by energizing the solenoid valve 1, the plunger 2 overcomes the force of the spring 3 and moves downward, so that it is connected to the pressure oil pipe 4. is constantly supplied with pressure oil, and this pressure oil is switched to the pressure oil pipe line 2.
2 and enters the check valve 19, and the valve 20 is pushed down by the pressure oil against the force of the spring 21 and communicates with the pressure oil pipe 25.

Therefore, it acts on the lower side of the piston 7 of the pressure oil lock cylinder 6 and presses the piston 7 upward.

On the other hand, the pressure oil accumulated above the piston 7 is discharged from the solenoid valve 1 through the pressure oil pipe 24, through the switching valve 15, and into the pressure oil pipe 5 by the urging of the solenoid valve 1.

As a result, the piston 7 moves upward and the fork 9 connected thereto also moves upward, and the lock is released.

On the other hand, when the servo motor 11 moves the piston 12 to the left using pressure oil from the pressure oil inlet 13, the lever 18 connected to the piston 12 also moves to the left, and the pilot valve 17 of the switching valve 15 is moved to a predetermined stopper by the spring 16. Move left to position.

Further, pressure oil is constantly supplied to the pressure oil pipe 26, and by moving the pilot valve 17 to the left, the pressure oil pipe 23 and the check valve 19 are connected, and the valve 20 is connected to the pressure oil pipe 22 together with the spring 21 of the check valve 19. overcoming the force of the pressure oil and moving it upwards,
It passes through the pressure oil pipe 25 and presses the piston 7 downward to maintain the unlocked state.

When locking, when the piston 12 of the servo motor 11 is at a predetermined position, that is, the position where the stopper 10 and the fork 9 can be held on the a side, the pilot valve 17 of the switching valve 15 is pushed with the lever 18 and moved to the right, and at the same time the pressure is The pressure oil in the oil pipe 26 is cut off, the pressure oil in the pressure oil pipe 23 is drained from the switching valve 15, and the pressure oil in the pressure oil pipe 5 is communicated with the pressure oil pipe 24 to act on the upper part of the piston 7, and Move 7 down to lock.

〔Effect of the invention〕

According to the present invention, when the locking device of the servo motor is opened, even if the electromagnetic fluid switching device is erroneously operated or the power is lost, the locking device of the servo motor can be reliably held in the open position.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional servo motor locking device, and FIG. 2 is a diagram showing a servo motor locking device according to the present invention. 1... Solenoid valve, 6... Lock cylinder, 7... Piston, 9
...fork, 10...stopper, 11...servo motor,
12...Piston, 15...Switching valve, 17...Pilot valve, 18...Lever, 19...Check valve, 22, 23, 2
5, 26...Pressure oil pipe line.

Claims (1)

[Claims] 1. In a servo motor locking device consisting of a stopper provided on the piston rod of the servomotor, a locking device that fixes or releases the stopper by switching fluid, and an electromagnetic fluid switching device that operates the locking device, the locking device and the electromagnetic A check valve installed in the lock release channel of the lock device that connects the fluid switching device and the piston rod of the servo motor operate together in response to the operation, and when the lock device is opened, the check valve is automatically activated by fluid pressure. A locking device for a servo motor, comprising a switching valve that switches to a fluid source that holds the locking device in an open position.