Escalator speed and reversal detection method and device based on rotary encoder

Abstract

The invention discloses an escalator speed and fault detection method and device based on a rotary encoder and relates to the field of escalator speed measurement and reversal detection. The method comprises the following steps that 1), the state of the rotary encoder is monitored at startup to determine whether an escalator is running or not, and if yes, the self-learning is started, and the second step is executed; and if not, the process ends; 2), an A-phase signal and a B-phase signal of the rotary encoder are acquired, and statistic of the pulses of the rotary encoder is performed; and 3), whether the escalator reversal exists or not is judged according to the acquired signal, and if yes, the escalator is stopped; and if not, the escalator speed is calculated by the adoption of an interrupting mode according to the pulses. The device comprises an acquisition circuit, a filter circuit and a single chip microcontroller. The acquisition circuit comprises a rotary encoder signal acquisition unit, an amplifying unit and a strong and weak electricity conversion unit. The escalator speed and fault detection method and device solve the problem that the rotation direction is measured by the adoption of a rotary encoder, and difficult capturing is caused by the microsecond class time in the prior art, capturing of the microsecond-class A-phase signal and the microsecond-class B-phase signal is achieved, and therefore the effect of measuring the rotation direction is achieved.

Description

technical field [0001] The invention relates to the field of escalator speed measurement and retrograde detection, in particular to an escalator speed and retrograde detection method and device based on a rotary encoder. Background technique [0002] The long-term operation of the escalator is prone to metal fatigue and failure of safety components, such as the breakage of the driving chain; the displacement of the traction machine due to loose bolts, etc., resulting in the retrograde movement of the elevator; the existing retrograde detection senses the escalator by setting a proximity switch The situation can be judged accordingly, but the proximity switch is greatly affected by environmental factors, resulting in poor measurement accuracy; on the other hand, the rotary encoder is a device used to measure the speed and cooperate with PWM technology to achieve rapid speed regulation. The photoelectric rotary encoder uses photoelectric conversion. It can convert mechanical q...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is: the present invention provides an escalator speed and fault detection method and device based on a rotary encoder, which solves the problem of detection of retrograde due to the difficulty in capturing the direction of rotation in microseconds when using a rotary encoder. difficult question

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