Safety monitoring and controlling system of escalator/moving sidewalk

Abstract

The invention provides a safety monitoring and controlling system of an escalator / moving sidewalk, and belongs to the technical field of the protection of escalators / moving sidewalks from overspeeding, reversing and exceeding safe braking distance. The safety monitoring and controlling system comprises a PLC (Programmable Logic Controller) processor and two proximity sensors, wherein the proximity sensors acquire detection information from gear teeth of a driving duplex chain wheel, and send the detection information to the PLC processor through an electric cable, the PLC processor gives corresponding instructions through computation to control operation of the escalator / moving sidewalk so as to stop the escalator / moving sidewalk efficiently in time when the escalator / moving sidewalk overspeeds, reverses and exceeds the safe braking distance. Compared with a code disc type structure, the safety monitoring and controlling system has the advantages that the proximity sensors are free from the restriction of oil dirt, can directly detect signals produced by primary driving gear teeth, and are not affected by the displacement of a traction machine. Compared with the original detecting position, the safety monitoring and controlling system is closer to a target, so that intermediate links are reduced, more real detection signals can be detected, 16 pulse signals can be produced per second, a safeguard can respond within one second in case of an overspeed and a reversion, and therefore life safety of people can be protected in a better manner.

Description

technical field [0001] The invention relates to a safety monitoring and control system for an escalator / moving walkway, which belongs to the technical field of overspeed protection, reverse protection and safety stop distance protection for escalators and moving walkways. Background technique [0002] At present, people pay more and more attention to the safety of escalators and moving walks. In particular, the escalator accident in the Beijing subway in 2011 sounded the alarm for people. National standard GB16899-2011. [0003] The occurrence of overspeed, underspeed and non-manipulated reversal can be roughly divided into the following situations: [0004] 1. When the fluctuation value of the input voltage exceeds ±7%, the electromagnetic torque output by the motor will increase or decrease, which will cause the increase or decrease of the speed of the escalator. [0005] 2. The phenomenon that the chain "climbs" on the sprocket. In extreme cases, the transmission chain...

AI Technical Summary

Problems solved by technology

[0004] 1. When the fluctuation value of the input voltage exceeds ±7%, it will cause the electromagnetic torque output by the motor to increase or decrease, which will cause the increase or decrease of the speed of the escalator

[0005] 2. The phenomenon that the chain "climbs" on the sprocket

In this way, the output torque of the traction sprocket of the driving shaft decreases, and the speed of the escalator decreases.

[0007] 4. When the transmission chain or V-belt is broken, or the coupling between the drive motor and the reduction box fails, the control between the drive unit and the drive main shaft sprocket may be out of control, and non-manipulative reversal may occur

At this time, even if the escalator speed monitoring safety device operates, the power is cut off, the working brake brakes, and the motor stops, the escalator cannot be stopped, and non-manipulated reverse rotation occurs.

[0008] 5. If the escalator running upwards encounters abnormal conditions such as motor failure, inverter no-voltage output failure, or phase sequence protection function failure, while the working brake is still in the normal release state, the escalator cannot stop at this time, and an accident will occur. non-manipulated reversal

[0014] The above several methods have disadvantages, and all of them cannot stop the escalator in operation in time when an accident occurs.

Images