Movable arm and flat arm dual-purpose tower crane

Abstract

The invention discloses a movable arm and flat arm dual-purpose tower crane. The tower crane comprises a tower top, a cargo boom and a balance arm used for connecting the tower top and the cargo boom. The cargo boom is provided with a flat arm amplitude-change mechanism and a movable arm amplitude-change mechanism, and a pivoting support is hinged to the root of the cargo boom. The end of the cargo boom is connected with a movable arm lifting hook, and the movable arm lifting hook controls the elevation angle change of the cargo boom through the movable arm amplitude-change mechanism to make amplitude-change movement. The first chord is connected with one end of a flat arm pull rod and one end of a movable arm pull rod, and the other end of the flat arm pull rod and the other end of the movable arm pull rod are connected with the tower top. The lower chord is connected with a flat arm trolley. The lower side of the flat arm trolley hangs a flat arm lifting hook through a lifting steel wire rope, and the flat arm lifting hook controls horizontal displacement of the flat arm trolley through the flat arm amplitude-change mechanism to make amplitude-change movement. The movable arm and flat arm dual-purpose tower crane has a flat arm operating mode and a movable arm operating mode, the functions of a movable arm tower crane and a flat arm tower crane can be fused, the operating functions can be switched at will, and the advantages of the two tower cranes can be achieved at the same time.

Description

technical field [0001] The invention relates to a dual-purpose tower crane with movable arm and flat arm, belonging to the technical field of engineering machinery. Background technique [0002] With the development of national industry and urban construction, higher requirements are put forward for the hoisting equipment of tower cranes, and the existing tower cranes have different advantages and disadvantages. [0003] Luffing jib tower crane is a kind of tower crane with small turning radius, large lifting capacity and high lifting height, which can change the amplitude by controlling the elevation angle of the jib. It takes 3 minutes for the jib tower crane to change from the maximum range to the minimum range, which will seriously affect the working efficiency in some occasions with small lifting capacity and frequent hoisting. [0004] The flat-arm tower crane is a kind of tower crane whose boom is fixed horizontally, and the hoisting hook is suspended by the trolley ...

AI Technical Summary

Problems solved by technology

[0003] Luffing jib tower crane is a kind of tower crane with small turning radius, large lifting capacity and high lifting height, which can change the amplitude by controlling the elevation angle of the jib. It takes 3 minutes for the jib tower crane to change from the maximum range to the minimum range, which will seriously affect the working efficiency in some occasions with small lifting capacity and frequent hoisting

[0004] The flat-arm tower crane is a kind of tower crane whose boom is fixed horizontally, and the hoisting hook is suspended by the trolley and moves along the boom horizontally to realize the amplitude-changing tower crane. The shortcomings are as follows: the radius of gyration is relatively large during operation, such as: the flat-arm tower crane with 60m arm length, when operating at 10m and 60m amplitude, the boom gyration radius is 60m; in addition, the balance arm of the flat-arm tower crane is also relatively large. Long, the general length is two to three times that of the luffing jib tower crane; at a small range, its hoisting performance is much smaller than that of the luffing jib tower crane

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