Stroke detection device for crane steel rope

Abstract

The invention relates to a stroke detection device for a crane steel rope. The stroke detection device comprises a pulley block composed of at least three pulleys, wherein a displacement sensor is arranged on one pulley. Compared with the prior art, the stroke detection device has the advantages as follows: as one pulley block is used, the close fit of the steel rope and the pulleys can be ensured, and the stroke of the hoisting steel rope can be precisely detected, the stroke detection device can carry out overwinding and overunwinding limiting of a crane and can accurately control the position of a grab hook. The invention further relates to a limiting and controlling method for a crane hoisting mechanism using the detection device.

Description

technical field [0001] The invention relates to a detection device, in particular to a crane wire rope stroke detection device. Background technique [0002] When the crane uses steel wire rope to lift heavy objects, in order to ensure the safety of the crane, it is necessary to control the wire rope over-rolling limit and over-release limit. Among them, the over-rolling limit of the crane is mainly to prevent the hoisting hook from continuing to lift to cause damage to the machine and cause accidents; Make sure that the wire rope is fixed on the drum. [0003] Aiming at the limit of the overwinding of the crane, the prior art generally uses a weight switch set on the hoisting wire rope to limit the position. The general over-rolling limit device is to hang a heavy hammer next to the fixed pulley, set it on the wire rope, and the rope hanging the heavy hammer pulls a switch. When the lifting hook reaches the maximum lifting height, the heavy hammer is lifted and the heavy ...

AI Technical Summary

Problems solved by technology

However, for telescopic jib cranes, a wiring mechanism is required to transmit signals, which is troublesome to use and adjust

[0004] For the over-discharge limit of the crane, the existing technology generally uses the drum rotation to obtain signals to determine the position of the last three turns. Since the wire rope has different winding levels on the drum, the last three turns are determined by the drum rotation position. Insufficient precision

Images