JPH0512465U - Oil leak detection device for hydraulic elevator - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to detect an oil leak from the joint of hydraulic piping of a hydraulic elevator in a small amount, issue an alarm, and stop the oil supply of the piping to stop the elevator operation. And [Structure] An oil pan is installed at a place where oil leakage is expected, such as a pipe joint, a sender and a receiver are installed above the oil pan, a relay is connected to the end of the receiver, and a stop valve motor is connected to hydraulic pressure. Configure an oil leak detection device for an elevator.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil leak detection device for a hydraulic elevator.

[0002]

[Prior Art]

 The configuration of a conventional hydraulic elevator will be described with reference to FIG.

The hydraulic elevator drives an oil pump 2 by an electric motor 1, supplies oil in an oil tank 3 to a hydraulic jack 8 via a control valve 4, a silencer 6 and a stop valve 7 via a pipe 5, The cylinder 9 of the jack 8 is pushed up to raise and lower the car 10.

Since the pipe 5 is connected by connecting the pipes 11 at a plurality of locations to each other or connecting the pipes to a device, oil leakage may occur due to insufficient tightening or deterioration of the joint. When there is an oil leak, the pressure oil to the hydraulic jack 8 is depressurized, and the car 10 does not rise but descends. Further, if oil leakage occurs while the car 10 is stopped, the car 10 descends and a gap occurs between the car floor surface and the landing floor surface.

[0005]

[Problems to be solved by the device]

 If there is a large amount of oil leakage, it will interfere with the raising and lowering of the car, leading to an accident. However, in this case, it is natural that the oil leak is known from various phenomena such as the fluctuation of the hydraulic pressure and the trouble of the traveling of the car, and the countermeasure can be taken.

However, it is ideal that a large amount of oil leakage can be almost prevented if the oil leakage is small and a countermeasure is taken if the oil leakage is small. However, mechanical or electrical detection of a small oil leakage is difficult, and maintenance is difficult. It was a problem because it would be overlooked because it would be known at the time of inspection.

In view of the above, the present invention has an object to provide a device capable of promptly detecting an oil leak, issuing an alarm and taking an appropriate measure even when the oil leak is small.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an oil pan below the joint of pipes and equipment where oil leakage easily occurs, and mounts a sender and a receiver above the oil pan to prevent the presence of oil. It is configured to detect by light reflection.

[0009]

[Action]

 When the oil leaks from the pipe joint portion by the detection device having the above-described configuration, the oil that has dripped on the oil pan is accumulated and an oil surface is formed. The light emitted from the light projector is reflected by the oil surface and reaches the light receiver, and the light receiver operates to detect oil leakage.

This output excites the relay, uses the contact output to issue an alarm, and takes various appropriate measures.

[0011]

【Example】

 The present invention will be described with reference to the embodiments shown in FIGS.

The oil receiving tray 12 is provided in the pipe joint 11 or the like where oil leakage is expected, and the projector 13 and the light receiver 14 can be mounted above the oil receiving tray 12 at an angle of 45 ° with respect to the bottom surface of the oil receiving tray 12. A relay 15 is attached to the terminal of the light receiver 14, and a battery 16 is connected as a power source for the light projector 13 and the light receiver 14. The relay 15 is connected to the stop valve motor 18 via its contact point 17.

When there is no oil leak from the pipe joint 11, there is no oil in the oil pan 12, and even if light is projected from the projector 13, the light does not reach the light receiver 14, and the light receiver 14 is inoperative. Therefore, the relay 15 is not excited and the stop valve motor 18 is not activated, so that the oil normally flows in the pipe 5 and raises and lowers the car 10.

When an oil leak occurs, the dropped oil is accumulated in the oil pan 12 and an oil surface 19 is formed. The light from the light projector 13 is reflected on the oil surface 19 and reaches the light receiver 14, the light receiver 14 operates, the circuit is closed, and the relay 15 is excited. When the relay 15 is excited, its contact 17 is turned on, the stop valve motor 18 is activated, the stop valve 7 is closed, the flow of oil is stopped, the lowering of the cylinder 9 due to oil leakage is stopped, and the car 10 is stopped.

In addition, the contact point 17 of the relay 15 is used to issue an alarm and notify the administrator or take other actions.

With the oil leak detection device of the present invention, it is possible to detect an oil leak at an early stage, issue an alarm, and control the stop valve 7 to stop the oil flow in the pipe 5. Can be suppressed. Also, since a small amount of oil leakage can be detected immediately before a large amount of oil leakage, it is not necessary to perform inspection and maintenance before it becomes important and stop the elevator for a long time.

[0017]

[Effect of the device]

 According to the present invention, a small amount of oil leakage of the hydraulic elevator can be detected early and appropriate measures can be taken to improve the safety and reliability of operation of the hydraulic elevator.

[Brief description of drawings]

FIG. 1 is a schematic front view of a hydraulic elevator.

FIG. 2 is a front view of an oil leakage detection device according to the present invention.

FIG. 3 is an operation explanatory diagram of FIG. 3;

FIG. 4 is a schematic view of a stop valve.

[Explanation of symbols]

 2 ... Pump 3 ... Tank 5 ... Piping 7 ... Stop valve 9 ... Cylinder 10 ... Basket 11 ... Piping joint 12 ... Oil pan 13 ... Emitter 14 ... Receiver 15 ... Relay

Claims (1)

[Scope of utility model registration request] 1. A hydraulic elevator for supplying pressure oil of a power unit to a hydraulic jack to elevate and lower a car, wherein an oil pan is provided at a required location of the power unit and its hydraulic circuit, and an optical sensor is provided for each of the oil pans. An oil leak detection device for a hydraulic elevator, which detects the oil in the oil.