挖掘機(jī)破碎作業(yè)工作裝置動態(tài)特性及疲勞分析
[Abstract]:In addition to bucket, excavator bucket pole can carry a variety of operating devices, hydraulic hammer is one of them. Excavator crushing is widely used in practical production and greatly improves working efficiency and labor safety. Because of its working characteristics, its working device often appears resonance, structural deformation, fatigue wear and other damage in the severe shock vibration. The relevant researchers have carried out research, but are confined to the single member such as the arm bucket rod, etc. There is no overall analysis, this paper starts from the whole, through the research of the dynamic characteristics of the excavator crushing work device, for which the frequency match between the hammer and the main engine is carried out. The main work is as follows: (1) the general situation of excavator industry and various kinds of excavator operating devices are introduced firstly. Then, the research status of excavator working device is discussed, and the research status of excavator working device is summarized, and the purpose significance and research content of the subject are put forward in view of these problems. (2) after analyzing the superior performance and problems in the production of excavator installed with crushing hammer, the vibration differential equation of excavator is established. According to the reference model, the three-dimensional model of the working device was established, and the three typical three dimensional model was obtained by adjusting the expansion length of each group of cylinders. The ANSYS Workbench and Pro/E are connected seamlessly and the model is imported into Workbench. Then the finite element model of three working conditions is established by meshing and setting up boundary conditions. (3) the mode analysis of the working device under the condition of no liquid filling and the mode analysis of the solid-liquid coupling state are carried out, and the frequency and mode shape of the working device under three working conditions are obtained, and the results are analyzed and compared. The mode of the working device is fully understood, which provides a reference for the frequency matching of the hammer. (4) selecting three key positions of the working device, analyzing the harmonic response of the three working conditions, obtaining the displacement frequency response curve of the key position of the working device, and analyzing the amplitude-frequency characteristic of the key position of the structure. The characteristics of resonance, fatigue load and other continuous dynamics of the working device are verified. (5) the S-N curve of the working device established in the Workbench material library is analyzed by finite element method under three typical working conditions, and the minimum fatigue life is obtained. The location of the device and the area where the working device is prone to fatigue provides a reference for the optimum design of the working device to prolong its service life.
【學(xué)位授予單位】:太原科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:TU621
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