Auxiliary cargo boom for crane

Abstract

The invention discloses an auxiliary cargo boom for a crane. The crane comprises a lower vehicle part, an upper vehicle part which is positioned on the upper part of the lower vehicle part and is connected with the lower vehicle part, a main cargo boom connected with the upper vehicle part and the auxiliary cargo boom connected with the main cargo boom through a connector, as well as a front luffing bracket and a rear luffing bracket, wherein fixed ends of the front and rear luffing brackets are pivoted with the connector; a front pulling plate assembly is connected between the movable end of the front luffing bracket and the top of the auxiliary cargo boom, and the movable end of the front luffing bracket is connected with the rear luffing bracket through a luffing pulling plate; the lower vehicle part is provided with a luffing winch assembly; and a luffing pulley block is connected between the movable end of the luffing bracket and the luffing winch assembly through a stay cord. The luffing winch assembly tightens or releases the stay cord, force generated by winching acts on the rear luffing bracket through the stay cord, and acts on the auxiliary cargo boom through the luffing pulling plate, the front luffing bracket and the front luffing pulling plate in turn so as to realize continuous change of the included angle between the main cargo boom and the auxiliary cargo boom.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an auxiliary jib used for a crane. Background technique [0002] With the rapid development of my country's economic construction, the market's demand for cranes is increasing day by day. Large-scale venues, wind power, bridge projects, etc. are all completed by large-scale special hoisting equipment - cranes. [0003] At present, the length of the main jib of a large crane is 80 meters, which can meet the requirements in terms of height, but the lifting capacity at this height is small, and it is impossible to complete the hoisting operations of wind power and bridges with a certain height; In order to enable the crane to lift heavier loads, a secondary jib can be added to the main jib of the crane. However, due to the limitations of the job site and hoisting height, it is not enough to adjust the angle only by the main boom, and it is also necessary for the auxil...

AI Technical Summary

Problems solved by technology

[0009] In the above-mentioned prior art, only three included angles can be realized between the auxiliary boom and the main boom, and reaching a certain height mainly depends on the adjustment of the elevation angle of the main boom to meet the needs of the working conditions. Less, in some cases, it may be inconvenient to complete the lifting task, or even unable to complete the lifting task, causing a lot of inconvenience to the construction

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