On-line detecting device and method for descending brake distance of crane hoisting mechanism

Abstract

The invention relates to an on-line detecting device and method for a descending brake distance of a crane hoisting mechanism. The on-line detecting device comprises a crane operation condition signal detection portion 1 and a measuring and recording portion 2, wherein the crane operation condition signal detection portion 1 includes an encoder, a brake power-off detection unit 4 and a hoisting direction detection unit 5; the measuring and recording portion 2 includes a controller 10, a signal interface unit 9, a display and operation unit 11 and a data storage unit 12; the encoder is an incremental encoder 3 or an absolute value encoder 13. The brake distance detecting method includes that the measuring and recording portion 2 monitors the descending brake process of the hoisting mechanism in real time, acquires data of descending brake distance, and calculates the descending brake distance. The measuring and recording portion 2 measures and records the measuring result of every brake distance in real time, and sends out warning signals when the brake distance approaches to or exceeds a specified value to prompt deterioration of brake performance, the variation trend of brake performance can be observed through a brake performance curve, failure of a brake mechanism can be discovered at early stage, accidents caused by deterioration of brake performance can be avoided, early stage forecast can be achieved, and operation safety of the crane can be effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of special equipment safety detection, in particular to an on-line detection device and method for the braking distance of a hoisting mechanism of a crane. Background technique [0002] The descending braking distance of the crane hoisting mechanism is an important index to measure the safety performance of the hoisting machinery. For a long time, the detection of this index is carried out during the regular performance inspection of the crane. Due to the deterioration of the braking performance, the excessive sliding amount cannot be detected and predicted in time, which seriously threatens the safe operation of the hoisting machinery. [0003] At present, the detection of the falling braking distance of cranes mainly includes visual inspection and special instrument methods. Patent application numbers 200710173656.3 and 200720077662.4 provide a detection device and method for the falling braking distance o...

AI Technical Summary

Problems solved by technology

[0002] The descending braking distance of the crane hoisting mechanism is an important index to measure the safety performance of the hoisting machinery. For a long time, the detection of this index is carried out during the regular performance inspection of the crane. Due to the deterioration of the braking performance, the excessive sliding amount cannot be detected and predicted in time, which seriously threatens the safe operation of the hoisting machinery

[0003] At present, the detection of the falling braking distance of cranes mainly includes visual inspection and special instrument methods. Patent application numbers 200710173656.3 and 200720077662.4 provide a detection device and method for the falling braking distance of the crane lifting mechanism. These detection methods and methods are only applicable to crane production. It is impossible to achieve long-term continuous monitoring of this index when testing the braking performance of the products shipped from the factory, or testing the braking slide during the annual inspection of the crane.

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