JPS58207268A - Safety device for 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 The present invention relates to improvements in elevator safety devices.

First, a safety device installed in a conventional elevator will be explained with reference to FIG.

In the figure, l is a current detector, 2 is a current detection circuit for converting the output of the current detector into a digital quantity, 3 is a thyristor converter, and 4 is a winding connected to the output of the thyristor converter 3. an upper motor, 5 a pulse generator for detecting the rotation speed of the hoisting motor 4, 6 a hoisting machine directly connected to the hoisting motor 4, 7 a pull rope wound around the rope of the hoisting machine, 8 1 is an elevator car connected to one end of the rope 7, 9 is a counterbalance H-shaft connected to the other end of the rope 7, 10 is a pattern generation circuit that generates a speed pattern, and 11 is a microphone combinator processing device. interfaces 12, 13, 14 and a central processing unit (hereinafter referred to as CPU) for inputting output signals from the pattern generation circuit IO1 current detection circuit 2 and pulse generator 5 into the computer 11.
15, and a memory 16 for storing processing programs and the like. Further, 17 is an interface that outputs the thyristor conversion 430 firing control angle obtained by the calculation of the electronic computer 11 to the thyristor conversion 430 phase circuit 18, and the phase circuit 18 operates based on the electronic computer 110 command. This generates a gate pulse for firing the thyristor of the thyristor converter 3.

In the circuit configured in this way, the pulse generator 5
If the circuit malfunctions, there will be no feedback signal for speed control, so the electronic computer 11 will
The electric motor 4 cannot be controlled according to the output of the pulse generator. I have to.

As a result, there was a problem in that passengers with 8 yen per car were left in a so-called "dead state" and could not be rescued.

The present invention solves the above-mentioned drawbacks and aims to provide an elevator safety device that can rescue passengers in an elevator car in the event of a pulse generator failure.

Hereinafter, while reading an embodiment of the present invention in FIG. 2, the same reference numerals as in FIG. The output of the circuit 19 is input to the temperature computer 11 (specifically, 0PU15) through an interface 20.

Next, the operation of the inventive device configured as described above will be explained.

If the pulse generator 5 fails while the elevator is running, the failure detection circuit 19 detects the failure, and this failure signal is sent to the 0PU via the interface 20.
15iC is taken in. The OP U15 processes the failure signal based on a predetermined program and outputs the processing result to a sequencer (not shown), thereby causing the elevator to make an emergency stop. put on. After a certain period of time, when the car 8 comes to a complete stop, rescue pattern data is transmitted from the pattern generation circuit 10 via the interface 12 of the electronic computer 11 in response to a command from the sequencer. It is taken into PU15. At this time, since the pulse generator 5a is out of order, the rotation of the electronic computer 15 and the hoisting motor 4 is detected by the following calculation.

That is, assuming that the thyristor converter 30 is a power supply voltage Vac, the output Bd of the thyristor converter 3 is 1.
Given by Eq.

Bd = Kp * Va c @coscL””t
l) However, Kp is a coefficient determined by the SiRisk converter. On the other hand, the hoisting motor's 40 rotation speed is W, and the armature current is I.
d, armature resistance Pa, then Ed=Ke11Wc+
Id11fLa... (2) However, Ke is the voltage coefficient of the motor, etc. Accordingly, from equations (1) and (2) above, VV
= −(1,35Vac−cosα−■d−fLe)・
...(3) Ke , and the rotational speed of the hoisting motor 4 can be determined.

Therefore, by calculating the above formula +3), the electronic computer 11 can follow the pattern output and control the hoisting motor 4, and the car 8 can be rescued to the nearest floor and rescued safely. can do.

Having explained the above, the present invention is provided with a pulse generator failure detection circuit, and when the pulse generator fails, the rotation of the hoisting motor is determined from the phase control angle and current value of the cyrisk converter using the signal from the perturbation detection circuit. Since the number is calculated and the hoisting motor is controlled based on the calculated value, it is possible to eliminate the problem of passengers in the car being crammed inside the car.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing a conventional elevator speed control device t, and FIG. 2 is a block diagram showing an example of an elevator safety device according to the present invention. 1...Parent current detector, 2...Current detection circuit, 3...
Thyristor converter, 4...Hoisting motor, 5...Pulse generator, 8...Elevator car, 10...
・Pattern generation circuit, 11...Electronic computer, 12, 13
,14,17゜20...interface,15...
・CPU, t6...Memory, 18...Phase circuit, 1
9... Failure detection circuit. The same reference numerals in Figure 21 indicate the same or equivalent parts.

Claims (1)

[Claims] An elevator equipped with an electronic computer for performing speed control calculations, a current detector for detecting an armature current of a hoisting motor, a speed detector for detecting the rotational speed of the motor, and a thyristor converter for controlling the motor. The safety device is provided with a failure detection circuit for detecting a failure of the speed detector, and when the speed detector fails, a failure signal from the failure detection circuit is taken into an electronic computer, and the failure signal of the thyristor converter is read. A safety device for an elevator, characterized in that a rescue operation is performed by calculating the rotation speed of the electric motor from a phase control angle and an output of the current detector.