Pre-tightening method for super-lift inhaul cable of all-terrain crane

Abstract

The invention belongs to the technical field of mechanical equipment, and relates to a pre-tightening method for a super-lift inhaul cable of an all-terrain crane. The pre-tightening method comprisesthe following steps that S1, a proper working condition is selected, the arm length L of the all-terrain crane is determined according to the lifting height, amplitude and the like, and the length H of the released super-lift inhaul cable is determined according to the arm length L; S2, a main arm extends to a rope releasing position, a winch releases the super-lift inhaul cable with the length ofH, and a locking device is locked; and S3, a main arm telescopic oil cylinder pushes a second-section arm to extend, so that the length of the arm reaches L, and pre-tightening is achieved. Accordingto the pre-tightening method for the super-lift inhaul cable of the all-terrain crane, the pre-tightening principle is characterized in that the main arm telescopic oil cylinder pushes the main arm to extend, and the hinge point at the upper end of the super-lift inhaul cable extends outwards along with extension of the main arm, so that the distance between the two hinge points of the inhaul cable is increased, and tensioning of the inhaul cable is achieved; and according to the pre-tightening method for the super-lift inhaul cable of the all-terrain crane, the structure is simplified, the preparation time is saved, the operation steps are reduced, and a tensioning oil cylinder in a super-lift supporting rod can be effectively replaced, so that a hydraulic system is simplified, the manufacturing cost is saved, the main arm telescopic oil cylinder is fully utilized to provide large pre-tightening force, and the lifting performance of the crane is maximized.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment, and relates to a method for pre-tightening cables of super-lifting all-terrain cranes. Background technique [0002] The super-lift device of the all-terrain crane transmits the force and moment received at the arm head to the turntable to improve its stress state, which can greatly improve the lifting performance of the crane. It is necessary to pre-tighten the super-lift cable to exert the super-lift The role of the device, different preload also affects the lifting performance. [0003] At present, the commonly used preloading method is to use a winch or a tensioning oil cylinder to preload at the head of the super-lifting strut: when using a winch, because the preloading force it can provide is small, it needs to be preloaded under the condition of the main boom elevation angle of 65°. And then luffing to work at the working angle; and using the tensioning cylinder to preload ca...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used preloading method is to use a winch or a tensioning oil cylinder to preload at the head of the super-lifting strut: when using a winch, because the preloading force it can provide is small, it needs to be preloaded under the condition of the main boom elevation angle of 65°. And then luffing to work at the working angle; using the tensioning cylinder to preload can provide a larger pretensioning force, but it is necessary to install the tensioning cylinder in the super lifting strut, which increases the cost

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