Door open running preventing system of elevator

Abstract

A door-open operation preventing system of elevator is used for preventing the operation of elevator under the door-open state. A door-open operation abnormity determining circuit (14) outputs an emergency stop instruction signal to an inversion control circuit (5) when the determination of input based on the door-open detecting signal from a door open detector (13) and the current instruction signal from a speed control circuit (11) shows the abnormity of door-open operation. The door-open operation abnormity determining circuit (14) determines the abnormity of door-open operation without using the speed detection signal from a speed detector (10) and therefore the reliability can be insured.

Description

technical field [0001] The invention relates to an elevator door-opening prevention system. Background technique [0002] Recently, how to effectively prevent an accident in which an elevator runs with its door open is actively discussed. As a structural example for preventing such an accident, a technology is disclosed in which a double brake called a rope gripping device is made safe when the door-opening state is detected by the door-opening detector and the car moves at or above a certain speed. The device operates to fix the hoisting rope, thereby preventing the elevator from running with the door open (see Patent Document 1). [0003] Patent Document 1: JP-A-2007-55691 [0004] However, in the structure of Patent Document 1, a double braking safety device called a rope clamp must be added in addition to the usual braking device, and as a result, the cost increases accordingly. In addition, in the structure of Patent Document 1, a speed detector such as a pulse gener...

AI Technical Summary

Problems solved by technology

[0004] However, in the structure of Patent Document 1, in addition to the usual braking device, it is necessary to add a double braking safety device called a rope clamp device, so the cost also increases accordingly.

In addition, in the structure of Patent Document 1, a speed detector such as a pulse generator installed on the traction machine is used as the trigger unit for detecting the movement of the car, that is, the operation of the rope clamping device, but the speed detector is used when the elevator is running. It is a device that works all the time, so it is difficult to guarantee reliable reliability after a certain period of time

Images