Crane and wire cable length measuring device thereof

Abstract

The invention provides a crane and a wire cable length measuring device of the crane. The measuring device comprises a base comprising two brackets, wherein one end of the each bracket is connected with a mast of the crane; a rotating shaft, wherein both ends of the rotating shaft are respectively connected with the other end of each bracket; a head pulley mounted on the rotating shaft, wherein a wire cable winds around the head pulley; a roller bearing matched with the head pulley for clamping the wire cable; two connectors mounted on the rotating shaft and respectively located at both sides of the head pulley and the rotating shaft for connecting the head pulley with the roller bearing so that the wire cable can roll relative to the head pulley without relative sliding; and a counter connected with one end of the rotating shaft for measuring the length of the wire cable. The discharge length of the wire cable is measured in real time through above way to control the length of the wire cable under different working conditions, so as to bring the bearing property of the wire cable into full play. In this way, the lifting property of the crane is improved.

Description

technical field [0001] The invention relates to the technical field of cranes, in particular to a crane and a measuring device for the length of steel wire ropes thereof. Background technique [0002] With the development of wheeled cranes to super-large tonnage, the main arm is getting longer and longer, and the lifting capacity is getting larger and larger. The use of super-lifting devices has become inevitable. Among them, the super-lifting device is to set a Y-shaped boom-type super-lifting mast between the main arm of the crane and the tip of the main arm to improve the lifting performance of the crane in the long-arm working condition. However, in the prior art, there is no device for accurately measuring the payout amount of the wire rope of the crane, and the wire rope is usually pre-tightened in the initial state. After the crane completes the boom movement, the super-lifting ratchet locking device pre-tightens the wire rope through the locking cylinder. In the pri...

AI Technical Summary

Problems solved by technology

However, in the prior art, the initial state of the steel wire rope can only maintain a pre-tightened state, which causes the crane to bear a lot of force on the steel wire rope under certain working conditions, while the overall force on the main arm is not large, and the strength of the main arm cannot be well utilized. Carrying capacity

Due to the pre-tensioning of the steel wire rope, the tension of the steel wire rope increases during hoisting, resulting in the overall instability of the axial pressure of the main arm; in some working conditions, the force on the main arm is already large, but the force on the steel wire rope is not sufficient, and the super-lifting device does not work. To the due role, and then restrict the further improvement of the lifting performance of the crane

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