Stair loss detection device for escalator

Abstract

The invention discloses a stair loss detection device for an escalator. The stair loss detection device comprises a fixed supporting board, a rotary arm which is rotatably arranged on the supporting board, a rolling piece which is arranged at one end of the rotary arm and pressed against the side face of a stair in a rolling way, an elastic piece which is arranged between the rotary arm and the supporting board and capable of providing an elastic restoring force for the rotary arm so that the rotary arm is driven to rotate when the stair is lost, and a contact switch which is fixed and rotated to be contacted with the rotary arm to send a signal for stopping running the escalator. When stairs exist continuously, the rolling piece on the rotary arm can be stably pressed against the side faces of the stairs through the elastic piece, and a gap is formed between the rotary arm and the contact switch, the contact switch is not triggered and the escalator runs stably; and when a stair is lost, the rolling piece is pressed against nothing and the elastic restoring force of the elastic piece rotates the rotary arm, the contact switch is triggered to send a signal for stopping running theescalator. The detection device is combined by mechanical components; compared with the detection device adopting photoelectric probes, the detection device is low in cost, convenient in installationand reliable in use.

Description

technical field [0001] The invention relates to a detection device for missing steps of an escalator. Background technique [0002] The steps of the escalator are moving parts for passengers to stand on. When the escalator is in normal use, the steps of the escalator are continuously arranged on the traction chain and circulate with the chain. In fact, sometimes one or several steps of the escalator will be removed during maintenance. If the maintenance personnel forget to reinstall the steps after maintenance, the steps on the chain will not be arranged continuously, that is, there will be a gap . At this time, during the process of taking the elevator, the passenger is likely to step into the neutral gear with one foot, resulting in a very serious safety accident. For this reason how to detect whether there is a neutral step to exist is very important. In the prior art, the step loss detection device generally adopts the form of a photoelectric probe to detect whether th...

AI Technical Summary

Problems solved by technology

For this reason how to detect whether there is a neutral step to exist is very important. In the prior art, the step loss detection device generally adopts the form of a photoelectric probe to detect whether there is a neutral. On the one hand, the cost is relatively high. The installation requirements are very high. The gap between the probe and the steps should not be too large or too small. If it is too large, it will exceed the detection range of the probe. If it is too small, it will easily collide with the steps and cause damage to the probe.

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