Self-inspection device for detection system for absolute position of lift car and self-inspection method thereof

Abstract

The invention discloses a self-inspection device for a detection system for an absolute position of a lift car and a self-inspection method thereof. The self-inspection device comprises a grating ruler, a recognition assembly and a controller, wherein the grating ruler is vertically arranged in a liftway and is provided with at least two groups of marks which are arranged at intervals in the length direction of the grating ruler, each mark comprises a first identification unit and a second identification unit which are arranged at intervals in the length direction of the grating ruler, the recognition assembly is fixedly arranged on the lift car and comprises at least three sensors, the sensors are used for detecting the first identification units and the second identification units and are arranged at intervals in the vertical direction, the first identification units or the second identification units cannot be simultaneously detected at the same detection position, and the controller can receive feedback information sent by the sensors and judging whether a fault exists in the detection system or not according to the feedback information. The self-inspection device and the self-inspection method thereof have the advantages that the identification changes of the grating ruler can be comprehensively detected, and whether a fault exists in the detection system for the absoluteposition of the lift car or not can be automatically detected.

Description

technical field [0001] The invention relates to the technical field of elevators, in particular to a self-inspection device and a self-inspection method of a car absolute position detection system. Background technique [0002] In recent years, the elevator market has successively introduced some components that realize the absolute position detection of the elevator car by hanging the scale with absolute position information on the hoistway, such as magnetic scale, two-dimensional code scale, and steel belt grid with holes. Many elevator manufacturers purchase these components to develop elevator safety functions, such as "checking the deceleration status of the stroke reduction buffer", "overspeed detection of the speed limiter", "unexpected car movement detection, etc.". The implementation of safety functions must be based on electronic safety systems with a high safety integrity level. These systems all require a complete self-inspection mechanism and can achieve high di...

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Problems solved by technology

[0003] However, although the traditional self-inspection method can detect some faults, the diagnostic coverage is not high enough to ensure that the system can enter a safe state when any of the above-mentioned sensors fail.

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