JPS63306178A - Position compensator for hydraulic elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the configuration and control of a position correction device for a hydraulic elevator.

[Conventional technology]

Hydraulic elevators raise, lower, and stop cars using hydraulic jacks. If the load inside the car changes due to people or objects being transported while the car is stopped, the position of the car may change upward or downward, which may impede people getting on and off or loading and unloading objects. However, the vertical movement of the car causes discomfort to people.

Therefore, in order to eliminate such inconveniences, a position correction device for detecting a change in the position of a car in a hydraulic elevator and supplying pressure oil to a hydraulic cylinder is proposed, for example, in Japanese Patent Laid-Open No. 49
-134048, and this device uses an accumulator as a pressure source. In other words, it consists of a hydraulic pump for supplying pressure to the accumulator, an electric motor that drives the hydraulic pump, a device for detecting the position of the car, and an electric switching valve that operates in conjunction with this device. The hydraulic pump and electric motor only supply pressure to the accumulator, and are considered separately from the hydraulic system for running the hydraulic elevator.

This will be explained based on the circuit of the conventional position correction device shown in FIG. The main hydraulic power unit includes a hydraulic pump 1 driven by an electric motor 2, a flow control valve 4 that limits the flow rate of pressure oil discharged by the hydraulic pump 1, and a flow control valve 4 to prevent the pressure oil from flowing back toward the hydraulic pump 1 side. Check valve 5, and relief valve 10. and relief valve 10
It consists of a tank 20 etc. that receives the oil returned by etc.

Further, the hydraulic jack 3 is not only connected to this main hydraulic power unit, but also to a hydraulic power unit dedicated to the position correction device. The hydraulic power unit dedicated to this position correction also includes a small hydraulic pump 23 driven by a small electric motor 24, a relief valve 21, and the like. Pressure oil discharged from the small hydraulic pump 23 is stored in the accumulator 8 via the directional control valve 22. This accumulator 8 is equipped with a pressure switch 9 for detecting the pressure of the accumulator. For this reason, this position correction device must be installed in the machine room of the hydraulic elevator separately from the hydraulic system that runs the elevator, which means that the plane area of the machine room must be increased, and the position correction device It required a dedicated hydraulic pump and electric motor, making it expensive.

[Problem that the invention seeks to solve]

As described above, the above conventional technology is effective in correcting the position of the car using an accumulator in response to sinking of a hydraulic elevator. A dedicated hydraulic pump and an electric motor are used to drive the hydraulic pump. Therefore, a position correction device must be provided in the elevator machine room in addition to the main hydraulic power unit that raises and lowers the hydraulic elevator, and there is a problem in that it is necessary to increase the planar area of the elevator machine room.

The present invention is to provide a position correction device for a hydraulic elevator without increasing the planar area of a machine room by incorporating it into a main hydraulic power unit.

[Means for solving problems]

In this invention, pressure oil discharged by a hydraulic pump driven by an electric motor is sent to a directional control valve via a flow control valve and a check valve, one of which is connected to an accumulator and the other connected to a hydraulic jack. The hydraulic jack raises a car of the elevator, and the car is equipped with a position detection device for detecting subsidence caused by a person or a conveyed object, and the directional control valve is configured to raise the car of the elevator. A lifting passage that connects the check valve and the hydraulic jack to raise the car, a correction passage that connects the accumulator and the hydraulic jack to compensate for sinking of the car, and a pressure accumulation passage that connects the check valve and the accumulator to accumulate pressure in the accumulator. It is a switching valve that opens any one of the passages, and is equipped with a control device that sends a signal to the directional switching valve to open the pressure accumulation passage after opening the correction passage and open the rising passage after a predetermined period of time. .

[Effect]

In this way, by sharing the hydraulic power unit (meaning an electric motor, a hydraulic pump, etc.) for raising the car and correcting the position of the car, there is no need to provide a hydraulic power unit dedicated to the position correction device. In addition, the capacity of the accumulator required for correction is extremely small compared to the amount of oil discharged by the hydraulic pump of the main hydraulic power unit used to operate the elevator, so the capacity of the accumulator is extremely small compared to the amount of oil discharged by the hydraulic pump of the main hydraulic power unit used for elevator operation. The predetermined time for is extremely short;
It can be said that said sharing does not cause any time problems when implementing the actual device.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. When the car is in ascending operation, the hydraulic pump 1 is operated at s! It is driven by the counter 2 and discharges pressure oil. This pressure oil is supplied to the flow control valve 4. Check valve 5
and is sent to the hydraulic jack 3. At this time, the directional control valve 6 provided between the hydraulic jack 3 and the check valve 5
The flow path is configured to connect the hydraulic jack 3 and the check valve (to open the upward passage). If the car sinks due to a person boarding the car when it reaches the floor level (at the time of landing), a command from the position detection device 7 installed in the car will cause the car to sink.
Accumulated pressure oil is sent to the hydraulic jack 3 from an accumulator 8 connected to the hydraulic jack 3 via a directional switching valve 6. At this time, the directional control valve 6 is connected to a passage (correction passage) connecting the accumulator 8 and the hydraulic jack 3.
It consists of Here, the detection device 7 can be configured by installing a car cam or installing a switch in the hoistway, or by detecting the rotational speed of a pulley that rotates in synchronization with the car to detect the position of the car. There is a method (not shown) that does this.

Further, it is necessary to constantly store pressure oil in the accumulator 8. - When the positional displacement correction is performed, the pressure held by the accumulator 8 decreases, so in response to a command from the pressure switch 9, the control device controls the hydraulic pump 1. The electric motor 2 is driven and pressure oil is supplied to the accumulator 8 via the directional switching valve 6 (using the pressure accumulation passage). The pump discharge force at this time is the pressure set by the relief valve 10. The pressure oil discharged from the pump 1 is either stored in the accumulator or returned to the tank via the relief valve 10. In addition, since the passage (ascent passage) connecting the check valve 5 and the hydraulic jack 3 in the directional control valve 6 is closed, the elevator will not rise when accumulating pressure in the accumulator, and the holding pressure of the accumulator 8 will reach a certain value. Then, the supply is terminated by a command from the pressure switch 9. The directional switching valve 6 constitutes a passage (accumulation passage) connecting the hydraulic pump 1 and the accumulator 8. Also, Akyumre τ
Pressure oil cannot be supplied to the elevator 8 while the elevator is in operation, but must be supplied only when the elevator is stopped.

According to this embodiment, there is no need to provide a dedicated hydraulic pump and electric motor for the position correction device, and it is only necessary to install the accumulator 8 and the directional control valve 6 in the main hydraulic power unit. Therefore, it is not necessary to enlarge the elevator machine room. do not have. Further, by setting the accumulated pressure of the accumulator 8 to the set pressure value of the relief valve 10 of the main hydraulic power unit, there is no need to use a dedicated relief valve for the position correction device, so the device can be provided at low cost.

The above FIG. 1 merely shows a circuit for raising the car and driving the car, and a circuit for correcting sinking of the car in position correction. Although a circuit for correcting the downward operation of the car and the lifting of the car is omitted, such a circuit is provided at the end of the pipe 11 in the figure.

Next, referring to FIG. 2, the operation of FIG. 1 will also be explained chronologically.

First, when a passenger (person or conveyed object) gets into the car, the position detection device 7 detects that the car has sunk and is activated, a signal is sent from the control device 12 to the directional control valve 6, and the correction circuit is activated. Can be opened. As a result, pressure oil is supplied from the accumulator 8 to the jack 3. When the car reaches the floor level due to this supply, the control device 1
A signal is sent from 2 to stop the supply of pressure oil.

Next, when the elevator door closes and the pressure switch 9 of the accumulator 8 operates to indicate that the accumulated pressure in the accumulator 8 is decreasing, the pressure accumulation passage is opened and pressure oil is supplied from the hydraulic pump 1 to the accumulator 8. . At this time, the car cannot be operated while pressure oil is being supplied to the accumulator 8 after the elevator door is closed, but the predetermined time for accumulating pressure is extremely short; The capacity required for the accumulator 8 of such a position correction device is several Q, and the amount of oil discharged from the hydraulic pump 1 is several hundred Q/min, so the time required for this supply is less than one second. In addition, in order to make this supply time even more unaffected, it is necessary to turn off the feeder 8 while the elevator door is closing.
It is also possible to supply pressure oil to.

〔Effect of the invention〕

According to the present invention, the position correction device can be incorporated into the main hydraulic power unit because a hydraulic pump dedicated to the position correction device and an electric motor for driving the hydraulic pump are not required. Therefore, position correction can be easily performed without increasing the space in the machine room.

[Brief explanation of drawings]

Fig. 1 is a hydraulic circuit diagram of one embodiment of the present invention, and Fig. 2 is a hydraulic circuit diagram of an embodiment of the present invention.
FIG. 3 is a flowchart showing the operation of the system, and FIG. 3 is a hydraulic circuit diagram of a conventional position correction device. DESCRIPTION OF SYMBOLS 1... Hydraulic pump, 2... Electric motor, 3... Hydraulic jack, 4... Flow control valve, 5... Check valve, 6...
One-way switching valve, 7-position detection device, 8-accumulator, 9-pressure detection device, 10-relief valve,
21...Relief valve for position correction device, 22...Directional switching valve for position detection device, 23...Hydraulic pump for position detection, 24-Electric motor for position detection.

Claims (1)

[Claims] 1. Pressure oil discharged by a hydraulic pump driven by an electric motor is sent to a directional control valve via a flow control valve and a check valve, and this directional control valve is connected at one end to an accumulator. The other is coupled to a hydraulic jack, the hydraulic jack raises a car of the elevator, and the car is equipped with a position detection device for detecting subsidence caused by a person or a transported object, wherein the directional control valve is connected to the car. a lift passage that connects the check valve and hydraulic jack to raise the car; a correction passage that connects the accumulator and the hydraulic jack to compensate for sinking of the car; and a pressure accumulation passage that connects the check valve and the accumulator to accumulate pressure in the accumulator. It is a switching valve that opens any one of the passages, and is characterized by being equipped with a control device that sends a signal to the directional switching valve to open the pressure accumulation passage after opening the correction passage and open the rising passage after a predetermined period of time. A position correction device for hydraulic elevators.