摘    要

Abstract
With the increasing need of lifting equipment, whether in bridge construction, ports, highways, mines, warehouse and other industries, the application of the crane and technology research and development is an important research subject at present.
In various types of cranes, the automobile crane has the advantages of flexible rotating field, complete functions and convenient and fast. This paper studies the performance and safe use of the crane's variable amplitude mechanism.
The function of crane is to carry out the transportation of large objects. Through the driving structure, driving mechanism, lifting mechanism and other complex mechanical movements of crane, the lifting function can be realized. At present, most cranes rely on hydraulic cylinder, hydraulic valves, various kinds of transmission mechanism for the work of the implementation mechanism. Crane is a kind of intermittent work, lifting objects, transportation, loading and unloading to the specified position, and then return to the original position.
The design for truck crane luffing YQ - 100 type hydraulic system design, based on the three hinged point amplitude structure, amplitude loop hydraulic cylinder, piston and piston rod components such as calculation, material selection, orientation, seal form, the installation of the hydraulic cylinder, the processing technology of each parts, need to solve the problem of cylinder and the rod body materials and seal selection problem and other issues, such as the luffing mechanism hydraulic system design, key hydraulic components selection. The part drawing of all the main parts of the oil cylinder is drawn by cad drawing software in combination with the overall size.
 
Key Words: Automobile crane; Variable amplitude mechanism; Hydraulic system; Hydraulic cylinder; Piston
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