JPH0211627Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a rotary actuator stop that automatically stops the operation of the rotary actuator at any angle in an emergency or intentionally in normal times. It is related to the device.

[Background of the idea]

In the event of an emergency such as a loss of hydraulic pressure due to a power outage or other accident, the operation of the rotary actuator must be immediately stopped. Further, even in normal times, there are many cases where it is necessary to stop the rotation of the rotary actuator at an arbitrary angular position or at several predetermined angular positions.

[Purpose of invention]

Thus, the present invention aims to provide a rotary actuator stop device that can immediately and smoothly stop the rotation of a rotary actuator when necessary, regardless of whether it is a normal situation or an emergency situation. It is something.

[Structure of the idea]

Although the present invention is constantly pressed with spring pressure,
A pressing body is provided that maintains a pushed back state against spring pressure while a constant hydraulic pressure is supplied, and the pressing body moves forward as the hydraulic pressure decreases, thereby stopping the operation of the rotary actuator. A rotary actuator stopping device characterized by regulating the retreating position of a pressing body by controlling the hydraulic pressure via a proximity switch, and the drawings show an embodiment thereof. It is. In the figure, A is a device according to the present invention, and B is a rotary actuator to which the present device is coupled, and the type thereof is not particularly limited. The illustrated rotary actuator B is a sealless type and is the most basic model. In the figure, 1 is a bowl-shaped pressing body with an open center, into which a disc spring 2 is fitted. 3 is a cylinder into which the pressing body 1 is inserted, and the pressing body 1 is fitted on the inner wall of the cylinder.
A pedestal portion 4 for receiving the water is formed. Reference numeral 5 denotes an oil port, which is arranged in the same hydraulic circuit as the oil port in rotary actuator B, which will be described later. 6 is an end cover that closes the end of the cylinder 3. Numeral 7 denotes bolts for joining the device A to the rotary actuator B. Several bolts are screwed into the cylinder 11 of the rotary actuator B from the end cover 6 through the cylinder 3. A holder spring 8 is fitted into a recess formed in the base portion 4. This holder spring 8 is pressed by a convex portion 9 formed on the bottom surface of the pressing body 1 when the oil pressure decreases, and at this time the rotor shaft 1
2, thereby stopping the rotation of the rotor shaft 12. The mechanism for stopping the rotation of the rotor shaft 12 is not limited to this, but any mechanism can be used as long as it can stop the rotation of the rotor shaft 12 by pressing the pressing body 1 with a spring. It may be. In addition to the above, for example, the inside of the convex portion 9 may be tapered, and this tapered surface may be brought into contact with the rotor shaft 12. A proximity switch 10 serves to prevent the pressing body 1 from returning too far when hydraulic oil is supplied from the oil port 5. That is, when an unlimited hydraulic pressure is applied to the pressing body 1, the disc spring 2
This acts to stop the pressing body 1 at a fixed position. The end of the rotor shaft 12 is fitted into the central opening of the pressing body 1. 13 is a flange attached to the rotor shaft 12, and a vane (not shown) is fixed between the flanges 13. (The rotary actuator shown is a 2-vane type). 14 is a stopper for setting the rotation angle of the rotor shaft 12, and a core metal 15 inserted through the cylinder 11.
to hold it in place. 16 is cylinder 1
1 is a radial bearing that is driven in from both sides of the stopper 14 to firmly support the rotor shaft 12. Reference numeral 17 is an oil port, and a pair of oil ports are provided on both sides of the stopper 14.

[Effect of invention]

To explain the illustrated embodiment of the operation of the present invention, the illustrated state is the rotor shaft 1.
2 has stopped rotating, but when a certain amount of hydraulic oil (during normal operation) is supplied through the oil port 5 from this state, the pressure body 1 resists the disc spring 2 due to the hydraulic pressure. and is pushed back. Its retracted position is controlled via proximity switch 10.
When the pressing body 1 retreats, the pressure on the holder spring 8 by the convex portion 9 is released, and the rotor shaft 12 is released from being pressed by the holder spring 8 and starts normal rocking rotation movement. When the supply of hydraulic oil decreases due to a power outage, malfunction, intentional operation, etc., the pressing body 1 is moved by the disc spring 2.
The convex portion 9 presses the holder spring 8, and the holder spring 8 is pressed against the rotor shaft 12, so that the rotation of the rotor shaft 12 immediately stops. Note that the operation of the rotary actuator B itself is the same as a normal one, so a description thereof will be omitted.

[Effect of idea]

Since the present invention is as described above, it can be easily installed on various types of ready-made rotary actuators, has a simple structure, operates instantly and reliably, and can stop the movement of the rotary actuator.
It is possible not only in an emergency but also to intentionally stop at a desired angular position, and there is also the advantage that there is no risk of the pressing body retreating too much and damaging the disc spring.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of an embodiment of the device according to the invention connected to a rotary actuator. Explanation of symbols, 1... Pressing body, 2... Belleville spring, 3
...Cylinder, 4...Pedestal, 5...Oil port, 6...End cover, 7...Bolt, 8...
...Holder spring, 9...Protrusion, 10...Proximity switch.

Claims (1)

[Scope of utility model registration request] A pressing body is provided that is constantly pressed by spring pressure, but remains pushed back against the spring pressure while a constant hydraulic pressure is supplied, and the pressing body moves forward as the hydraulic pressure decreases. By doing so, the operation of the rotary actuator is stopped, and
A rotary actuator stop device characterized by regulating the retreating position of a pressing body by controlling hydraulic pressure via a proximity switch.