JPH09242906A - Emergency shut-off device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop a lift body which ascends and descends by a hydraulic cylinder device surely when an abnormality such as leakage of liquid occurs. SOLUTION: A spring return type air operated open and close valve 4 is provided in a hydraulic cylinder device 2, a change-over valve 6 is provided in an air pipe 11 connected with a drive part 4a of the open and close valve 4, and a control panel 13 is provided which closes the open and close valve 4 by turning off the change-over valve 6 based on signals from sensors 3, 5, 14 which detect an abnormality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff device for a hydraulic cylinder device which is erected on a base member for elevating an elevating body.

[0002]

2. Description of the Related Art In an elevating body that moves up and down by a hydraulic cylinder such as a movable floor of a pool or a stage apparatus, it is dangerous if the elevating body falls due to leakage of hydraulic pressure. Therefore, in the case of hydraulic pressure in the pressure liquid pipe, a pilot check valve or the like is provided so that when the pressure in the pipe decreases due to leakage or the like, the hydraulic cylinder becomes inoperable. However, in the case of water pressure, there is no such cheap and reliable pilot check valve, etc., and it is used without an emergency shutoff valve, so if there is a leak in the pipe, prevent the lifting body from falling. I can't.

If the stop position is fixed, a mechanical stopper can be provided. However, for example, in the case of a movable floor of a pool, the stop position must be arbitrarily selected, and therefore the mechanical stopper cannot be installed.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an emergency shutoff device for a hydraulic cylinder device which can surely stop the lifting body in the event of an abnormality.

[0005]

According to the present invention, in a hydraulic cylinder device emergency shutoff device erected on a base member for elevating and lowering an elevating body, a spring return type air operated on-off valve attached to the hydraulic cylinder. Is connected to a water pressure pipe connected to a water pressure supply / discharge source via an air pipe connected to the drive unit of the opening / closing valve, is connected to an air supply source via a switching valve, and is connected to a sensor for detecting an abnormality. A control panel is provided for turning off the switching valve to close the on-off valve by a signal.

The sensor for detecting the above-mentioned abnormality is a pressure sensor provided in the hydraulic pipe, a position sensor for detecting the position of the seismic sensor or the lifting body provided in the control panel or in the vicinity thereof.

Therefore, if the switching valve is turned on, the pressurized air from the air supply source is applied to the drive portion of the opening / closing valve, so that the opening / closing valve is open.

Therefore, the hydraulic cylinder communicates with the hydraulic pressure supply / exhaust source through the hydraulic pipe, and is expanded by the hydraulic pressure supply and contracted by the discharge. At that time, if there is a leak in the hydraulic piping or the hydraulic pressure supply / discharge source, the control panel turns off the switching valve by a signal from the pressure sensor. Then, the air pipe is opened to the atmosphere, and the opening / closing valve is closed by the action of the spring. Therefore, the hydraulic cylinder stops at that position.

When the ascending / descending body descends suddenly due to leakage from the pipe, the control panel calculates the signal from the position sensor,
Similarly, the switching valve is turned off.

Furthermore, by inputting a signal from the seismic sensor to the control panel, it is possible to make an emergency stop in the event of an earthquake or the like.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. 1 in the case of a movable floor pool using a hydraulic cylinder.

In FIG. 1, for example, a hydraulic cylinder 2 is erected on a base member 12 which constitutes the bottom of the pool, and an elevating body 1 which constitutes, for example, the movable floor of the pool is attached to its rod 2a. A spring return type air-operated on-off valve 4 is directly attached to the hydraulic cylinder 2, and the on-off valve 4 has a reversible pump 8.
It is connected to the tank 9 through 0, and water 15 is stored in the tank 9. The tank 9 and the reversible pump 8 constitute a water pressure supply / discharge source.

On the other hand, the air compressor 7 constituting the air supply source.
Is connected to an air pipe 11 having a switching valve 6, and the pipe 11 is connected to the drive unit 4a of the opening / closing valve 4.

A position sensor 3 for detecting the position of the lifting / lowering body 1 is provided on the base member 12, and a pressure sensor 5 is provided on the pipe 10. In the figure, 14 is a seismic sensor.

The signal from the position sensor 3, the signal from the pressure sensor 5 and the signal from the seismic sensor 14 are input to the control panel 13, and the control panel 13 uses these signals in a manner described later in a manner described below. To switch.

In operation, when the switching valve 6 is turned on by the control panel 13 and the air compressor 7 and the driving portion 4a of the on-off valve 4 are connected by the pipe 11, the on-off valve 4 is opened. Then, the pump 8 is rotated in the normal direction and the water 15 in the tank 9 is sent to the hydraulic cylinder 2, and the lift 1 is raised. Pump 8 on the contrary
By reversing, the water in the hydraulic cylinder 2 is returned to the tank 9, and the lift 1 is lowered. The vertical movement of the lift 1 is detected by the position sensor 3 and input to the control panel 13. When the control panel 13 turns off the switching valve 6, the air in the pipe 11 is released from the switching valve 6 to the atmosphere.
The on-off valve 4 is closed by the operation of the spring. Then, the water in the hydraulic cylinder 2 is brought into a locked state, so that the lifting body 1 is stopped.

As described above, when the pipe 10 is leaked and the opening / closing valve 4 is opened, the water in the hydraulic cylinder 2 is leaked and the lifting / lowering body 1 is dropped. However, in the present invention, when a leak occurs in the pipe 10, a signal from the pressure gauge 5 is input to the control panel 13, and the control panel 13 detects a decrease in the pressure of the pipe 10 based on the signal from the pressure gauge 5 and switches the pressure. The valve 6 is turned off. As a result, the hydraulic cylinder 2 is locked and the lifting body 1 can be prevented from falling.

When the seismoscope 14 senses a seismic intensity equal to or higher than a predetermined value, the control panel 13 turns off the switching valve 6 and the elevator 1 is locked.

When the control panel 13 calculates a signal from the position sensor 3, the switching valve 6 can be turned off at the time of a rapid drop. Before starting the raising / lowering, the pressure in the pipe is checked by the pressure sensor 5 with the emergency shutoff valve 4 closed, and if the pressure is equal to or higher than a predetermined pressure value, the emergency shutoff valve 4 is opened to start the raising / lowering. If the pressure is low, a warning can be issued by the control panel to prevent a fall accident.

[0020]

As described above, according to the present invention, a spring return type air operated on-off valve fixed directly to a hydraulic cylinder and a hydraulic pipe connected to the valve to supply pressurized water to the hydraulic cylinder. A pressure sensor installed on the way,
Alternatively, a position sensor that detects the ascending / descending position of the object and a seismic sensor installed in or near the device are installed to monitor the output signal, and if an abnormality is detected, the control device closes the valve to prevent the object from falling. Therefore, it can be provided at an extremely low cost, and an excellent effect can be obtained in safety.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lifting body 2 ... Hydraulic cylinder 2a ... Rod 3 ... Position sensor 4 ... Spring return type air-operated on-off valve 4a ... Drive part 5 ... Pressure sensor 6 ...・ Switching valve 7 ・ ・ ・ Air compressor 8 ・ ・ ・ Reversible pump 9 ・ ・ ・ Sensor 10 ・ ・ ・ Water pressure piping 11 ・ ・ ・ Air piping 12 ・ ・ ・ Basic member 13 ・ ・ ・ Control panel 14 ・ ・ ・ Feeling Seismic instrument

Claims (4)

[Claims] 1. A hydraulic cylinder emergency shutoff device provided upright on a foundation member for moving up and down a lifting body, wherein a hydraulic pressure connected to a hydraulic pressure supply / discharge source via a spring return type air operated on-off valve attached to said hydraulic cylinder. The air pipe connected to the pipe and connected to the drive part of the on-off valve is connected to the air supply source via the switching valve, and the switching valve is closed to close the on-off valve with a signal from a sensor that detects an abnormality. An emergency shutoff device characterized by having a control panel for turning off the power. 2. The emergency shutoff device according to claim 1, wherein the sensor for detecting the abnormality is a pressure sensor provided in the hydraulic pipe. 3. The emergency shutoff device according to claim 1, wherein the sensor for detecting the abnormality is a seismic sensor provided on or near a control panel. 4. The emergency shutoff device according to claim 1, wherein the sensor that detects the abnormality is a position sensor that detects the position of the lifting body.