JP2000065247A - Extracting method and device of closer for control valve of hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the extracting work of a closer for control valve without requiring a large scale of device and enable any worker to extract it simply without considering the extracting direction and the extracting speed of an O-ring, in a hydraulic elevator. SOLUTION: When a closer C installed in the hole 30 of a hydraulic unit B, and having an O-ring Ca on the outer periphery, is extracted, a compressed air is fed from an air pump 29 having a coupler 27, to an attachment 26 fitted to the installing hole of the solenoid valve of the hydraulic unit B, to deliver the compressed air to the hole 30, so as to press up the bottom of the closer C. As a result, the closer C including the O-ring Ca can be extracted simply from the hole 30, by the force of the compressed air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of extracting a closer for a control valve of a hydraulic elevator and an apparatus for extracting the closer.

[0002]

2. Description of the Related Art Since a component with an O-ring for a control valve is incorporated in a hydraulic unit of a hydraulic elevator, it is necessary to periodically remove the component to replace an aged O-ring. As an example of such a extracting operation, a conventional extracting method for extracting a spool assembly attached to a control valve of a hydraulic unit will be described with reference to FIGS. 4 and 5.

A spool assembly 1 shown in FIG. 4 includes a spool 2 operable by, for example, an electromagnetic valve (not shown), and a pair of sleeves 3 and 4 fitted on the spool 2.
An O-ring 5 is fitted into the outer peripheral grooves 3a, 4a of the sleeves 3, 4, respectively. As shown in FIG. 5, the spool assembly 1 is inserted into the insertion hole 6a of the control valve 6, and a gap existing between the inner peripheral surface of the insertion hole 6a and the outer peripheral surfaces of the sleeves 3 and 4. Is sealed with an O-ring 5. The electromagnetic valve is detachably provided on a mounting surface 6b of the control valve 6, and an insertion hole 6a is formed on the mounting surface 6b so as to extend downward.
Has been established.

The spool assembly 1 is connected to a control valve 6
Conventionally, when removing the plug from the plug, a plug (not shown) closing the lower end of the insertion hole 6a of the control valve 6 is used.
Then, as shown in FIG. 5, a guide body 7 having a screw hole in the center is attached to the lower end of the insertion hole 6a, and a through bolt 8 screwed into the screw hole is screwed forward. As a result, the lower end portion of the spool assembly 1 is pushed up by the upper end portion 8a of the through bolt 8, and the spool assembly 1
Can be removed upward from the insertion hole 6a.

[0005]

By the way, when removing a part with an O-ring that seals the insertion hole, an O-ring is required so as not to damage the inner wall surface of the insertion hole due to an uneven load.
The ring must be moved straight along the centerline of the insertion hole. For example, the spool assembly 1 is inserted into the insertion hole 6a.
If the O-ring 5 is forcibly moved in a state where an eccentric load is applied, not only a smooth extraction operation cannot be performed but also the inner wall surface of the insertion hole 6a may be damaged and the sealing degree may be deteriorated. There is. Therefore, the guide body 7
The operation of aligning the center of the spool assembly with the center line of the insertion hole 6a and the operation of moving the spool assembly 1 while rotating the through bolt 8 require skill and the operation time is prolonged. Was.

Further, since the spool assembly 1 is relatively small and has a simple structure, the guide body 7 and the through bolt 8 as the extracting device can be manufactured small and lightweight. In the case of a control valve closer that controls the speed of the hydraulic elevator even with parts with
In order to extract this by the same method, not only a large-scale extraction device is required, but also the closeer is installed sideways depending on the shape of the control valve, and it is difficult to attach the guide body.

The present invention has been made in view of such a technical background, and a first object of the present invention is to perform a work of extracting a control valve closer of a hydraulic elevator in consideration of an O-ring extraction direction and an extraction speed. It is an object of the present invention to provide a method for extracting the closer, which can be easily performed by anyone without using a large-scale device. A second object of the present invention is to provide a closer extraction device which is suitable for use in extracting a control valve closer of a hydraulic elevator by such a extraction method.

[0008]

In order to achieve the first object described above, the present invention provides a tank for storing hydraulic oil, and a hydraulic unit connected to the tank via a pipe and having at least a solenoid valve and a control valve. A cylinder that raises and lowers the car in accordance with the inflow and outflow of the hydraulic oil, and an oil feed pipe interposed between the cylinder and the hydraulic unit. When removing the closer from the insertion hole in a hydraulic elevator in which the control valve movable by the fluid pressure is supported by a closer mounted in an insertion hole of the control valve and having an O-ring fitted on the outer periphery thereof, Stopping the car on the lowest floor, closing the pipe and the oil feed pipe, and then passing through the mounting hole for the solenoid valve provided in the hydraulic unit. Feeding compressed air into the insertion hole Te, by pressurizing the bottom of the door closer in the compressed air, and to push the door closer from the insertion hole.

[0009] By removing the solenoid valve provided in the hydraulic unit and pressurizing the bottom of the control valve closer with compressed air sent from the mounting hole, the O-ring of the closer will have a uniform air pressure. Therefore, anyone can easily remove the closer from the insertion hole of the control valve without considering the extraction direction and the extraction speed.

In order to achieve the second object,
The present invention provides an attachment capable of mounting a device for extracting the closer from the insertion hole into a mounting hole for the solenoid valve provided in the hydraulic unit in a fitted state, and a coupler connected to the attachment. And an air pump having:

[0011] The extraction device thus configured has a simple configuration and is excellent in handleability. In use, a coupler is attached to an attachment fitted to a mounting hole for a solenoid valve provided in a hydraulic unit. It is only necessary to supply compressed air from an air pump having In this case, the compressed air supplied from the air pump is fed into the insertion hole and pushes up the bottom of the control valve closer, so that the closer including the O-ring can be easily extracted from the insertion hole by the force of the compressed air. it can.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
A description will be given based on FIG. However, FIG. 1 is a cross-sectional view showing a hydraulic unit of a hydraulic elevator equipped with a closer extraction device according to this embodiment, FIG. 2 is a cross-sectional view showing a hydraulic unit of the hydraulic elevator in a normal state without the extraction device, FIG. 3 is a hydraulic circuit diagram of the hydraulic unit shown in FIG.

First, a schematic configuration of a hydraulic unit of a hydraulic elevator and an outline of hydraulic oil control performed by the hydraulic unit will be described with reference to FIGS. In addition,
A hydraulic unit generally indicated by reference numeral B in the figure is for controlling the flow of hydraulic oil between a tank A for storing hydraulic oil and a cylinder (not shown).
And connected to a cylinder via an oil feed pipe 25.

When raising the car, the electric motor 9
The hydraulic oil in the tank A is supplied to the cylinder through the pipe 11 and the check valve 12 by the pump 10 driven by the pump 10, so that the plunger (not shown) is pushed up and the car is raised. When the car is to be lowered, the pressure applied to the check valve 16 from the cylinder is reduced by exciting the solenoid valves 13 and 14 so that the pressure adjustment throttle 15, the solenoid valves 13 and 14, the pressure adjustment throttle 17, etc. , The check valve 16 is opened by the pressure of the pilot pipe 18, and the hydraulic oil in the cylinder is returned to the tank A via the check valve 16 and the oil supply pipe 19. When the hydraulic oil in the cylinder flows out in this way, the plunger descends, and accordingly the car descends.

Further, the deceleration of the car in front of the destination floor is performed by controlling hydraulic oil as follows. That is, first, the solenoid valve 13 is demagnetized, and the pressure from the cylinder flows to the tank A via the pressure adjustment throttles 15 and 20, the solenoid valve 14, the pressure adjustment throttle 17, the pilot pipe 21, and the like. Not all the pressure is released, and a part of the pressure acts on the check valve 16, so that the check valve 16 starts to close and the amount of hydraulic oil supplied from the cylinder decreases. When the check valve 16 is further closed, the pressure adjusting throttle 22 associated with the check valve 16 starts to open, and the pressure acting on the check valve 16 is reduced by the electromagnetic valve 1.
4, the pressure adjustment throttle 17, the pilot pipe 21, and the like, so that the oil can escape to the tank A. Eventually, when the pressure from the cylinder acting on the check valve 16 decreases and becomes equal to the pressure from the pilot pipe 18, the movement of the check valve 16 is temporarily stopped, and at this time, the tank A is connected via the check valve 16 and the oil supply pipe 19. The amount of hydraulic oil supplied from the cylinder returned to the inside is constant, and the car is ready for landing on the floor. When the car reaches the landing position, the solenoid valve 14 is demagnetized, and all the pressure from the cylinder is applied to the check valve 16 through the pressure regulating throttle 15.
Is fully closed, the hydraulic oil does not flow out of the cylinder, and the car stops.

The hydraulic unit B for controlling the hydraulic oil in this manner is provided with a control valve closer C in which the pressure regulating throttle 22 is inserted, and an O-ring is provided around the outer periphery of the closer C. Ca is fitted. The closer C is mounted in a hole 30 provided in the hydraulic unit B and is locked by a flange 23 screwed to a frame of the hydraulic unit B.

Next, a description will be given, with reference to FIG. 1, of the operation of extracting the closer C in the hydraulic unit B from the hole 30 for the purpose of, for example, replacing the aged O-ring Ca.

First, as a preparatory work, the car is stopped on the lowest floor to return all the hydraulic oil in the cylinder to the tank A, and the stop oil is closed by closing the stop valve 24 so that the hydraulic oil is supplied to the pipe 11 or the oil supply pipe 25. The power supply to the hydraulic elevator is shut off by turning off a breaker (not shown). Then, after removing the flange 23 and the solenoid valve 14 from the hydraulic unit B, an attachment 26 is mounted in a fitting state to the mounting hole to which the solenoid valve 14 was attached, and the attachment 26 is connected to the attachment 26 via a coupler 27 and a hose 28. To connect the air pump 29.

When the apparatus for extracting the closer is attached to the hydraulic unit B, compressed air is supplied from the air pump 29 to the attachment 26 via the hose 28 and the coupler 27, so that the compressed air is supplied to the hole 30.
Is pressed to press the bottom of the closer C, so that the closer C moves upward by the force of the compressed air and can be removed from the hole 30. At this time, the O-ring C of the closer C
Since a is pushed up by a uniform air pressure, there is no fear that the O-ring Ca will damage the inner wall surface of the hole 30. Therefore, the worker does not need to pay particular attention to the extracting direction and the extracting speed. Therefore, even if it is not a skilled person, the closer C can be easily extracted without damaging the inner wall surface of the hole 30, and the working time can be shortened. Further, the extracting device used in the present embodiment has the advantages that the configuration is simple, not large-scale, and excellent in handleability.

[0020]

The present invention is embodied in the form described above, and has the following effects.

If a method is adopted in which the solenoid valve provided in the hydraulic unit of the hydraulic elevator is removed and the bottom of the control valve closer is pressurized with the compressed air sent from the mounting hole, the O-ring of the closer can be obtained. Can be pushed up by a uniform air pressure, so that anyone can easily pull out the closer from the insertion hole of the control valve without considering the pulling direction and the pulling speed.

A device for extracting a control valve closer includes an attachment that can be fitted in the fitting hole for the solenoid valve in a fitted state, and an air pump having a coupler connected to the attachment. if,
It is not necessary to make the configuration of the apparatus complicated or large, and the workability can be shortened due to good handling.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a hydraulic unit of a hydraulic elevator equipped with a closer extraction device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a hydraulic unit of the hydraulic elevator in a normal state where the extracting device is not mounted.

FIG. 3 is a hydraulic circuit diagram of the hydraulic unit shown in FIG.

FIG. 4 is a sectional view of a spool assembly provided in the control valve.

FIG. 5 is an explanatory view of a conventional technique illustrating a method of extracting the spool assembly shown in FIG. 4 from a control valve.

[Explanation of symbols]

 A Tank B Hydraulic unit C Closer Ca O ring 14 Solenoid valve 16 Check valve 22 Pressure adjustment throttle 26 Attachment 27 Coupler 28 Hose 29 Air pump 30 Hole

Claims (3)

[Claims] 1. A tank for storing hydraulic oil, a hydraulic unit connected to the tank via a pipe and having at least a solenoid valve and a control valve, and a cylinder for raising and lowering a car as the hydraulic oil flows in and out. An oil supply pipe interposed between a cylinder and the hydraulic unit, wherein the control valve, which is movable by a flow pressure of the hydraulic oil that changes by opening and closing the solenoid valve, is mounted in an insertion hole of the control valve. In the hydraulic elevator supported by a closer having an O-ring fitted on the outer periphery thereof, when removing the closer from the insertion hole, the car is stopped at the lowest floor, and the pipe and the oil supply pipe are After closing, compressed air is sent into the insertion hole through the mounting hole for the solenoid valve provided in the hydraulic unit, and the compressed air By pressurizing the bottom of the chromatography The withdrawn method of closer control valve of a hydraulic elevator, characterized in that it has to push the door closer from the insertion hole. 2. A tank for storing hydraulic oil, a hydraulic unit connected to the tank via a pipe and having at least a solenoid valve and a control valve, and a cylinder for raising and lowering a car as the hydraulic oil flows in and out. An oil supply pipe interposed between a cylinder and the hydraulic unit, wherein the control valve, which is movable by a flow pressure of the hydraulic oil that changes by opening and closing the solenoid valve, is mounted in an insertion hole of the control valve. A hydraulic elevator supported by a closer having an outer periphery fitted with an O-ring, comprising: a device for extracting the closer from the insertion hole, the mounting being provided to the hydraulic unit for the electromagnetic valve. An oil, comprising: an attachment that can be attached to a hole in a fitted state; and an air pump having a coupler connected to the attachment. Extractor of the closer for elevator control valves. 3. The control valve for a hydraulic elevator according to claim 2, wherein the control valve is a control valve for descending operation, and the solenoid valve is an electromagnetic valve that is excited during the descending operation. Extraction device for the closer.