Telescopic main arm mast, crane and operation method thereof

Abstract

The invention provides a telescopic main arm mast, a crane and an operation method thereof, and relates to the technical field of cranes. The telescopic main arm mast comprises multi-stage telescopicbrackets connected in sequence slidably; a driving mechanism is provided at the joint of two adjacent telescopic brackets; one end of the driving mechanism is connected with one telescopic bracket, and the other end of the driving mechanism is connected with the other telescopic bracket; and the driving mechanism can drive the expansion and contraction of two adjacent telescopic brackets. Comparedwith the prior art, the telescopic main arm mast provided by the invention realizes the expansion and contraction of the main arm mast in the length direction through the multi-stage telescopic brackets connected in sequence slidably and the driving mechanism; and realizes the pulling-up of the telescopic main arm mast in the contracted state, and then realizes the expansion of the telescopic main arm mast through the driving mechanism, therefore, the risks that the main arm mast bears a great bending moment due to own weight in the pulling-up process, thus the material failure and damage ofthe main arm mast are caused, and the normal use of the crane is affected are avoided.

Description

technical field [0001] The invention relates to the technical field of cranes, in particular to a telescopic main arm mast, a crane and an operating method thereof. Background technique [0002] At present, in the crane industry, the main boom mast of the crane is used for lifting the jib, and the length, strength, and stiffness of the main boom mast play a key role in the lifting capability of the crane. [0003] like figure 1 , figure 2 As shown, the bottom end of the existing main arm mast 10 is hinged with the turntable of the crane, and one end of the arm frame 20 is also hinged with the turntable, and the top of the main arm mast 10 is connected with the end of the arm frame 20 away from the turntable through the pull plate 30. By setting The hoisting mechanism on the turntable and on the side opposite to the boom 20 drives the main boom mast 10 to rotate, thereby lifting the boom 20 . If the boom 20 is to be pulled up, the main arm mast 10 must be raised at first,...

AI Technical Summary

Problems solved by technology

Force F in jacking cylinder 2 The nearby main boom mast bears a huge bending moment. When the bending moment is large, it will cause the material failure of the main boom mast 10, such as local plastic deformation or even local tearing, etc., resulting in damage to the main boom mast 10 and affecting the normal use of the crane.

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