Crane and arm rising method thereof

Abstract

The invention discloses a crane and an arm rising method thereof. The crane comprises a rotary table (1), a main arm (2), a rear support rod (3), an amplitude variation auxiliary arm (4), a mast (5), a main arm pull plate (6) and a rear pull plate (7); the main arm and the mast are pivoted and installed on the rotary table; the rear support rod and the main arm are connected; the amplitude variation auxiliary arm and the rear support rod are connected; the main arm pull plate is connected between the mast and the main arm; the first end of the rear pull plate is connected with the rear support rod; the crane also comprises a rear pull plate connecting structure and a foldable pull plate component. The method comprises the following steps: firstly, connecting the second end of the rear pull plate and the mast; secondly, rising the arm to the main arm so as to form a preset angle with the horizontal level, and disconnecting the rear pull plate and the mast; and thirdly, rising the arm continuously according to the operation working condition of the crane. According to the scheme, because the arm is risen to the main arm to form the preset angle with the horizontal level, the rear pull plate (7) cannot interfere constructional elements on the rotary table or the main arm.

Description

technical field [0001] The present invention relates to the field of construction machinery, in particular to a crane and a method for raising an arm thereof. Background technique [0002] For a crane with a non-telescopic main arm, the rear pull plate is fixed on the main arm, and when the main arm is raised, the rear pull plate is fixed relative to the main arm. [0003] However, for a crane with a telescopic main arm, the rear pull plate cannot be fixed on the main arm because the main arm has a telescopic function. When the main boom is raised, in order to avoid the interference between the rear pull plate and the main boom structure or the turntable structure, an auxiliary crane must be used to lift the rear pull plate during the boom raising process, which is time-consuming and labor-intensive. Moreover, when the main boom is stretched and retracted, and the luffing jib moves to the working position, the operator needs to fix the rear pull plate on the mast. At this ...

AI Technical Summary

Problems solved by technology

At this time, since the main arm has been raised and the main arm is long, the fixed point on the mast is at a higher position, and the operator needs to work at heights, which brings inconvenience and safety hazards to the operation

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