Telescopic arm crane

Abstract

The invention discloses a telescopic arm crane. The telescopic arm crane comprises a telescopic arm frame, an auxiliary lift winch, a rotary support and an amplitude oil cylinder, wherein the telescopic arm frame comprises telescopic arms and a basic arms, a fixing end of the rotary support is in a pivotal connection with the basic arm of the telescopic arm frame, the amplitude oil cylinder is arranged between the rotary support and the basic arm so that the rotary support can surround the fixing end to rotate in a vertical plane, the auxiliary lift winch is provided with a superlift drawing rope, a movable end of the rotary support is provided with a rope guide wheel, and the superlift drawing rope passes through the rope guide wheel to be connected with any one of the telescopic arms of the telescopic arm frame. The auxiliary lift winch is arranged on a rotary table of the crane and provided with the superlift drawing rope, the movable end of the rotary support can achieve the superlift function by merely arranging the rope guide wheel, the structure is simple and compact, and the telescopic arm crane is convenient to transport, install and dismount.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a telescopic boom crane. Background technique [0002] With the rapid development of my country's economic construction, small and medium tonnage crane products have become the main force in the market. [0003] With the continuous upgrading of products, the lifting performance of small and medium tonnage cranes has been continuously improved. However, due to the limitation of the system strength and rigidity of the telescopic jib, the performance improvement space of small and medium tonnage cranes is getting smaller and smaller. In order to further improve the performance of small and medium-tonnage cranes, it is an inevitable choice to install super-lifting devices on the cranes. [0004] Please refer to Figure 1-Figure 3 , figure 1 It is a structural schematic diagram of an existing super-lifting device for a telescopic boom crane in a specific embodiment; ...

AI Technical Summary

Problems solved by technology

[0007] However, the structure of the existing super-lifting device is relatively complicated, and special super-lifting winches, wire ropes and other components need to be installed.

In addition, considering the high manufacturing cost of the super-lifting device and the extremely inconvenient installation and disassembly, the above-mentioned existing super-lifting devices are generally used for large telescopic boom cranes, and are not suitable for small and medium tonnage telescopic boom cranes

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