Reverse, over-speed and stall protection safety circuit of escalator and moving walkway

Abstract

The invention discloses a reverse, over-speed and stall protection safety circuit of an escalator and a moving walkway. The reverse, over-speed and stall protection safety circuit comprises an input control module, a control processing module, and an output execution module, wherein the input control module is used for detecting the running state of the escalator and the moving walkway and inputting a detected signal to the control processing module; the control processing module consists of a programmable logic device, and is used for determining whether reverse, over-speed and stall happen according to a running state signal of the escalator and the moving walkway inputted by the input control module, and for controlling the output execution module to act when reverse, over-speed and stall happen; and a normally-open contact of the output execution module is serially connected with a safety control circuit of the escalator and the moving walkway, and the normally-open contact is switched off when reverse, over-speed and / or stall happen so as to achieve the safety protection. The safety circuit provided by the invention can achieve non-operating reverse protection, over-speed andstall protection.

Description

technical field [0001] The invention relates to the field of control of escalators and moving walks, in particular to a safety circuit for protection against reversal, overspeed and stall of the escalators and moving walks. Background technique [0002] In the early years, the electrical safety devices of escalators and moving walks were realized by relatively simple circuits, which were classified as safety circuits. Now, more complex electronic components are used in the control circuit of the electrical safety device to realize the required functional logic, and some even have to be realized by PES (Programmable Electronic System). GB16899 "Safety Specifications for Manufacture and Installation of Escalators and Moving Walks" has noticed the use of electronic components in safety circuits and given hardware regulations. [0003] At present, GB16899 has expanded its scope to the control circuit of electrical safety devices, allowing PES (including software) to be realized...

AI Technical Summary

Problems solved by technology

[0005] At present, the non-manipulation and reverse protection of existing escalators and moving walks are not realized through safety contacts or safety circuits, which do not meet the requirements of GB16899, and through technical analysis and investigation, there is currently no reliable solution to use safety contacts. method to achieve non-manipulation reverse protection, so it is necessary to invent a method to realize non-manipulation reverse protection through a safety circuit to meet the requirements of GB16899

[0006] In addition, for the overspeed protection of escalators and moving walks, most of them are realized by mechanical safety devices at present, and the cost will be much higher relatively.

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