Absolute position detection device of elevator cab

Abstract

The invention relates to an absolute position detection device of an elevator cab. The absolute position detection device of the elevator cab comprises a traction wheel, a guide pulley, a traction wirerope, the elevator cab, a counterweight and an elevator main control panel. The absolute position detection device further comprises light projectors arranged at the two sides of the traction wirerope, a light receptor and a position controller communicating with the elevator main control panel. The light receptor comprises a photosensitive element and an image recognition element. The light projectors project light beams to the traction wirerope and project images generated when the traction wirerope moves to the photosensitive element of the light receptor to achieve imaging, the image recognition element of the light receptor conducts comparison and feature sampling on the images periodically and generates a corresponding displacement signal according to changes of the sampling features, the position controller conducts direction distinguish and calculation on the displacement signal, and the position of the elevator cab is detected. The absolute position detection device of the elevator cab is simple and practical, high in accuracy and free of detection errors caused by sliding.

Description

technical field [0001] The invention relates to the technical field of elevators, in particular to an absolute position detection device for an elevator car. Background technique [0002] As a necessary means of transportation in modern buildings, the elevator control system needs to accurately detect the absolute position of the car. At present, in the elevator industry, there are mainly two methods for detecting the position of the car: [0003] 1. The measurement method of the main engine traction sheave rotary encoder. This method is to install a rotary encoder on the shaft of the traction wheel of the main machine, and realize the detection and control of the motor speed and the position of the car through the signal fed back by the encoder. This method has the following disadvantages: [0004] a. The traction sheave of the main engine is used as the power mechanism of the elevator, the inertia is large, the load condition and dynamic moment change drastically, and the...

AI Technical Summary

Problems solved by technology

For the inner bearing structure in which the shaft does not move, the rotary encoder cannot be installed, and the application of the detection method for the absolute position of the car is limited

At the same time, this method cannot detect the movement of the elevator car after the speed limiter is activated or the rope is broken.

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