JPS6029056B2 - Fracture detection device for fluid high pressure pipelines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rupture detection device for a fluid high pressure pipeline used in a hydraulic power source or hydraulic system of a remotely controlled machine or an unmanned mechanical device.

BACKGROUND ART Conventionally, when monitoring a remotely operated hydraulic system, the method used to monitor the hydraulic circuit is to detect and display the pressure at necessary points in the hydraulic circuit using a meter, and to have the driver monitor the pressure. According to such a method, monitoring and inspection of the hydraulic circuit must be added to the items regularly monitored by the driver. Furthermore, if a hydraulic pipe ruptures and is discovered late, there is a problem in that not only mechanical equipment but also surrounding equipment may be damaged, and oil may leak out and cause contamination.
In view of the above points, the present invention aims to prevent accidents in hydraulic pipelines.
In particular, by automatically detecting pipeline rupture accidents in high-pressure lines, the operation of the hydraulic power source can be immediately stopped even in the absence of the operation manager, and damage to mechanical equipment and contamination can be stopped to the maximum extent possible. The purpose is to

The present invention also provides a pressure detector that detects the pressure in the high-pressure side pipeline of fluid, a pressure setting device that sets the minimum pressure of the high-pressure side pipeline, and a pressure value that is higher than the pressure value set by the pressure setting device. A comparator that issues a signal when the actual fluid pressure value in the high-pressure line decreases as detected by the pressure detector and detects when the pressure fluid supply source is supplying pressurized fluid to the load. and a discriminator that generates a signal for stopping the pressure fluid supply source based on the on-load signal from the on-load detecting means and the signal from the comparator.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an example of the apparatus of the present invention, and in the figure, 1 indicates a hydraulic power source. Reference numeral 2 denotes a hydraulic pump, which is driven by an electric motor 3 and sucks up hydraulic oil in a hydraulic tank 4 and discharges it to a high pressure line 5.

The maximum pressure at this time is controlled by the relief valve 6. Reference numeral 7 denotes a starting controller for the electric motor 3. This starting controller 7 receives a signal sent from a transmitter 8 of a remote control unit with a receiver 9, and is activated by the signal to start and stop the electric motor 3. It is something to control.

This is a pressure detector that detects the pressure in the high-pressure pipe line 5.

Pressure oil supplied to a load (not shown), such as a hydraulic motor, through the pipe 5 and the valve is recovered into the hydraulic tank 4 through the low-pressure pipe 11 after performing work. 12 is a transmitter, and this transmitter 12 transmits the signal a of the pressure detector 10 to the receiver 13 of the control section at a remote location.

After receiving the signal a, the receiver 13 amplifies it and transmits it to the comparator 14 as a signal a'. 15 is a pressure setting device, and this pressure setting device 15 sets the minimum pressure value necessary to drive the load of the hydraulic source 1, and emits the pressure signal b.

The comparator 14 compares the pressure signal b of the pressure setting device 15 with the pressure signal a' of the high pressure line 5, and outputs a signal c when the actual line pressure a' becomes lower than the set minimum pressure b. Occur. Reference numeral 16 denotes a command device for controlling the relief valve 6 from a remote location, and this command device 16 generates a signal d when the on-load switch is switched.

This signal d is transmitted to the relief valve 6 via a transmitter 8 and a receiver 9.
is transmitted to the solenoid 17 that controls the flow of oil in the high-pressure pipe 5 so that the pressure oil discharged from the hydraulic pump 2 is supplied to the load. Furthermore, when the command unit 16 is switched to the unload state, the signal d disappears and the solenoid 17 is de-energized, so the relief valve 6 loses its pressure control function. As a result, the flow of oil is controlled so that all the oil discharged by the hydraulic pump 2 is returned to the hydraulic tank 4 via the relief valve 6. Therefore, the fan load condition is hydraulic pump 2.
can be used when it is desired to stop the supply of oil to the high-pressure pipe 5 while it remains in operation, for example, to reduce ineffective power consumption during non-operation. When the unload state is switched to the on-load state, the pressure control function is restored to the relief valve 6, and the pressure of the oil discharged by the hydraulic pump 2 is controlled, and high-pressure oil is supplied to the load via the pipe line 5. be able to. 18 is a discriminator, and this discriminator 18 outputs an emergency stop signal e only when the signal d from the command unit 16, that is, the on-load signal, and the signal c from the comparator 14 are applied simultaneously.
occurs.

This signal e passes through the transceivers 8 and 9 and can actuate the starting controller 7 to stop the electric motor 3. As can be seen from the above explanation, the electric motor 3 is now rotating and the hydraulic pump 2
If the high-pressure pipe 5 of the hydraulic source 1 is cut while the relief valve 6 is switched to on-load mode to drive the hydraulic source 1 against the load, oil will flow out. As a result, the pressure inside the pipe line 5 decreases rapidly.

The pipe pressure at this time is detected by the pressure detector 10'. When the reduced pressure signal a' in the pipe line 5 becomes lower than a preset minimum pressure b, the comparator 14 generates a signal c. This signal c and the signal d of the command unit 16
As a result, the discriminator 18 generates an emergency stop signal e,
Stop the hydraulic pump 2. In the above example, the emergency stop signal e stops the oil supply from the hydraulic pump 2 that has stopped the electric motor 3, but a directional control valve is installed at the hydraulic source outlet of the high-pressure pipe 5. In response to the emergency stop signal e, the oil that has passed through the pipe line 5 can be directly collected into the hydraulic tank 7 before flowing to the load.

Further, by activating a warning display device that notifies the driver of the occurrence of an accident using the signal e, maintenance and supervision of the hydraulic system can be made even safer. As described in detail above, if the device of the present invention is installed in a hydraulic system, unmanned and remote equipment accident monitoring will be automated, and even if an accident such as a pipe breakage occurs, the oil will be automatically and promptly removed. supply can be stopped, and the safety and operational efficiency of the entire device can be improved.

[Brief explanation of the drawing]

The drawings are diagrams showing the configuration of an example of the device of the present invention. 1... Hydraulic source, 2... Hydraulic pump, 3
...Electric motor, 5...High pressure pipe, 6...
...Relief valve, 8,12...Transmitter, 9,1
3...Receiver, 14...Comparator, 15
......Pressure setting device, 16......Command device, 1
8... Discriminator.

Claims (1)

[Claims] 1. Supply pressure fluid from a pressure fluid supply source driven by an electric motor to a load including a control valve through a high-pressure side pipe, and discharge return fluid from this load to a tank through a return pipe, and at the same time In a hydraulic circuit system in which a bypass circuit equipped with a relief valve that discharges the pressure fluid supplied to the control valve into a tank when the load is at rest is connected to the high-pressure side pipe line between the control valve and the high-pressure side pipe, the high-pressure A pressure detector detects the pressure in the side pipe, a pressure setting device sets the minimum pressure in the high pressure side pipe, and the pressure value detected by the pressure sensor is lower than the pressure value set by this pressure setting device. A comparator that generates a signal when the fluid pressure value in the actual high-pressure line decreases, and an on-load detection that detects when the pressure fluid source is supplying pressurized fluid to the load. and a discriminator that generates a signal for stopping a pressure fluid supply source based on the on-load signal from the on-load detection means and the signal from the comparator. break detection device.