JP2000118917A - Landing control device for hydraulic elevator at power stoppage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the difference between a nearby story floor and a car floor in a rescue operation at the time of a power stoppage with a simple structure by providing a power stoppage descent speed detecting means detecting a car descent speed with an emergency power supply, and selecting a stop instruction position closing a descent solenoid valve with the detected speed. SOLUTION: When a power stoppage occurs during the travel of a car 1, a descent solenoid valve 6 is opened, the oil in a hydraulic cylinder 5 is discharged into a tank 15, and the car 1 is operated downward. Pulses are generated from an encoder 7 connected to the car 1 and are converted into a speed by a speed converter 8, and the optimum table is selected from stop instruction tables combined with the speed of the car 1 and the number of pulses of the encoder 7. When a magnetic sensor 9 detects a shielding plate 14 for a rescue zone, the number of pulses of the selected table is counted by the speed converter 8, the descent solenoid valve 6 is closed at the time of count-up, and the car 1 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landing control device for a hydraulic elevator during a power failure.

[0002]

2. Description of the Related Art Conventionally, as to a landing control device at the time of power failure of a hydraulic elevator, as described in Japanese Patent Application Laid-Open No. Hei 5-201656, a hydraulic cylinder for raising and lowering a car via a plunger, and a raising and lowering of the car Therefore, a pump for supplying or draining a working fluid to the hydraulic cylinder, and a main control valve provided between the hydraulic cylinder and the pump and having both a check function and a function of conducting in the opposite direction. In the hydraulic elevator configured with, while comprising means for detecting the opening of the hand control valve, while variably controlling the opening of the main control valve with a rescue operation command and car speed,
There has been a landing control device at the time of a power failure of a hydraulic elevator which feeds back the detected opening degree of the main control valve to a means for variably controlling the opening degree.

[0003]

In the above prior art, the opening of the main control valve is fed back at the speed of the car at the time of a power failure, so that the rescue operation speed can be controlled smoothly and the rescue position can be controlled with high accuracy. However, there is a problem in that if the device is attached to an already delivered product, costs including the inverter control device are required, and a period required for remodeling is required.

[0004] It is an object of the present invention to provide a landing control device for a hydraulic elevator in the event of a power failure, which can be remodeled to improve the accuracy of a car stop position in a rescue operation at the time of a power failure with a low cost and a short delivery time. .

[0005]

In order to achieve the above object, the present invention switches to a standby power supply when a power failure is detected, and lowers the car by a descent solenoid valve opened by the standby power supply. When the floor of the car and the floor of the nearest floor have a predetermined size, the descending solenoid valve is closed to stop the car at the nearest floor. And a power failure stop command selecting means for selecting a stop command position for closing the descending solenoid valve at the speed detected by the power failure descent speed detecting means. Things.

[0006] With this configuration, the position for closing the descending solenoid valve can be changed according to the car descending speed by the backup power supply, and the floor and the car floor can be easily rescued with a simple configuration during rescue operation during a power failure. Can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described with reference to FIG.

FIG. 1 is a block diagram showing the configuration of the entire system according to an embodiment of the present invention.

The car 1 is connected to a pulley 3 and a plunger 4 via a rope 2, and a hydraulic cylinder 5 is connected to a descending solenoid valve 6. An encoder 7 that generates a pulse according to the movement of the car 1 is connected to the car 1, and a pulse signal from the encoder 7 is transmitted to a speed converter 8. Further, the car 1 is provided with a magnetic sensor 9 for detecting that the car has entered the rescue zone on the nearest floor, and a signal from the magnetic sensor 9 is transmitted to the rescue zone detector 10.

The control device 11 comprises a stop command selecting device 12 for selecting a stop command based on signals from the speed converter 8 and the rescue zone detector 10, and a descending solenoid valve control device 13.

Next, an embodiment of the present invention configured as described above will be described with reference to the flowchart of FIG.

When a power failure occurs while the car 1 is running, the descending solenoid valve 6 is opened, and the oil in the hydraulic cylinder 5 is drained from the tank 15.
, And the car 1 moves down. At this time, a pulse is generated from the encoder 7 connected to the car 1 and converted into a speed by the speed converter 8. Since this speed generally changes in proportion to the number of passengers in the car 1 and the temperature of the oil in the hydraulic cylinder 5, a stop command table combining the speed of the car 1 and the number of pulses of the encoder 7 shown in FIG. Choose a more optimal table. When the magnetic sensor 9 detects the shield plate 14 for the rescue zone, the number of pulses in the table selected as described above is counted by the speed converter 8, and at the same time as counting up, the descending electromagnetic valve 6 is closed, and the car 1 is stopped. .

[0013]

According to the present invention, the position of closing the descending solenoid valve can be changed according to the car descending speed by the backup power supply, so that the vehicle can be re-established with the simplest configuration in the rescue operation at the time of a power failure by riding the nearest floor. The step with the car floor can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an entire system according to an embodiment of the present invention.

FIG. 2 is a flowchart of an embodiment of the present invention.

FIG. 3 is a stop command table in landing operation during a power failure used in an embodiment of the present invention.

[Explanation of symbols]

 6 Lowering solenoid valve 7 Encoder 9 Magnetic sensor 11 Controller

Claims (2)

[Claims] When a power failure is detected, the power supply is switched to a standby power supply, and the car is lowered by a descending solenoid valve opened by the standby power supply, and when the floor of the car and the floor on the nearest floor have a predetermined size. In a power failure landing control device for a hydraulic elevator in which the descending solenoid valve is closed to stop the car at the nearest floor, a power failure descending speed detecting means for detecting a car descending speed with the standby power supply, And a power failure stop command selecting means for selecting a stop command position for closing the descending solenoid valve at the speed detected by the power failure descent speed detecting means. 2. The stop command position selected by the power failure stop command selection means is a dimensional difference between the car floor and the nearest floor, and the dimensional difference is proportional to the car descending speed. 2. The landing control device at the time of a power failure of a hydraulic elevator according to claim 1, wherein: