求翻译：本论文主要研究的液压起重机的起升机构及液压系统，按照机械设计手册起重机工程手册等资料，说明了起重机起升机构的设计原则，起重机械方案的确定液压起升机构与变幅机构的分析，起重机起升零部件的选择与校核，得出了起身机构的初步设计方案是什么意思？

In this thesis, the main research hydraulic crane hoisting mechanism and hydraulic system, in accordance with the mechanical design manual crane engineering manuals, indicating that the crane hoisting mechanism design principles, lifting machinery program to determine the hydraulic hoisting mechanis

This paper studies the main hydraulic crane lifting bodies and hydraulic system, in accordance with the machinery design manual crane engineering manuals, instructions, and information on the crane lift of crane design principles, the program determine the hydraulic lift and body changes in the anal

The present paper main research hydraulic jack lifts the organization and the hydraulic system, according to materials and so on machine design handbook hoist crane engineering manual, explained the hoist crane lifts the organization principle of design, the hoisting machinery plan definite hydrauli

Study on the main hydraulic system of hydraulic hoisting mechanism of crane and, according to the Handbook of mechanical engineering design manual crane information, explains the design principles of hoisting mechanism of crane, lifting scheme for hydraulic lifting mechanism and analysis of luffing

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