預應力塔式起重機雙吊點起重臂的設計與研究
[Abstract]:Among all kinds of construction machinery, tower crane is the most widely used in various fields. In recent years, the market share of flat head tower crane has gradually increased. The common tower cranes such as QTZ63 / QTZ80 / QTZ100 / QTZ125 have excellent performance compared with other tower cranes. But nowadays, with the development of construction industrialization, large tower cranes are coming into people's eyes more and more, and the disadvantages of flat tower cranes appear obviously in large equipment. Therefore, this paper is based on QTZ125 flat tower cranes. A new type of double-point prestressed tower crane is studied and designed. Its reliability and lifting performance are improved. The main work of this paper is as follows: the advantages and disadvantages of various kinds of tower cranes are summarized and analyzed, and the shortcomings of flat-head tower cranes as one of the most rapidly developing tower cranes are analyzed. This paper presents a method of increasing the tension bar system and applying prestressing force to reduce the weight of the lifting arm or directly lift the crane's lifting performance. The theoretical principle and the application mode of the prestressing force are studied in detail. Based on the tower cap type and 125 flat head tower crane, a new type of prestressed double crane lifting arm is designed for the local metal structure of the tower crane. The traditional theoretical mechanical calculation of the balance arm and the metal structure part of the cantilever of the prestressed double-point tower crane is carried out. The basic knowledge of the finite element method is studied, and the ANSYS modeling of the prestressed double-point tower crane and the 125-flat head tower crane is carried out. Under the same working condition, the static analysis of the double-hoisting point prestressed tower crane and the 125-flat head tower crane is carried out. The maximum stress and deformation of the two tower cranes are compared, and the reliability and advanced nature of the former tower crane are tested based on the performance level. Finally, according to the ANSYS software, the paper optimizes the strut system of the model of the prestressed double-point tower crane, and obtains a group of optimal schemes such as the length, angle of the strut and the position of the lifting point of the pull rod. The static analysis and correlation comparison are made with the double point prestressed tower crane and 125 flat head tower crane before optimization.
【學位授予單位】:山東建筑大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TH213.3
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