A method of pretensioning cables for superlifting all-terrain cranes

Abstract

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. The steps are as follows: S1: Select a suitable working condition, determine the arm length L of the all-terrain crane according to the lifting height, amplitude, etc., and determine the length H of the super-lifting cable according to the arm length L; S2: Extend the main arm to the rope release position, The hoist releases the super-lifting cable with a length of H, and the locking device is locked; S3: The telescopic oil cylinder of the main arm pushes the second-section arm to extend, so that the arm length reaches L, and realizes pre-tightening. The pre-tightening principle of the present invention is as follows: the telescopic oil cylinder of the main arm pushes the main arm to elongate, the upper hinge point of the super-lifting cable stretches out with the elongation of the main arm, and the distance between the two hinge points of the cable increases, realizing the tension of the cable. tension. The invention simplifies the structure, saves preparation time, reduces operation steps, can effectively replace the tensioning oil cylinder in the super-lifting strut, simplifies the hydraulic system, saves manufacturing costs, and makes full use of the telescopic arm oil cylinder to provide a large pre-tightening force, so that the crane can lift Heavy performance 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°. Then change the amplitude to work at the working angle. For example, the application number 2...

AI Technical Summary

Problems solved by technology

For example, the application number 20130698469.2, the patent name is the superlift pretensioning device and the crane, and the pretensioning of the tension cylinder can provide a larger pretension force, but it is necessary to install the tension cylinder in the superlift strut, which increases the cost

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