| In recent years, construction machinery has been greatly developed, especially with the vigorous development of the national construction industry, the truck-mounted concrete pump has been widely used. Truck-mounted concrete pump is a kind of construction machinery, which can be used to transport the pre-mixed concrete to a certain height and distance by pressure, with continuity, high efficiency, high flexibility, which make the truck-mounted concrete pump become indispensable in the field of construction machinery. Under this trend and the emergence of many domestic concrete pump manufacturers, making the popularity of domestic truck-mounted concrete pump is getting higher and higher.Base assembly as one of the most important parts of the truck-mounted concrete pump is mainly used to bear the weight of the machine swing part and tipping moment when the machine works. So its structural design is reasonable or no related to the safety of the machine and its market competitiveness. While, the base assembly of curved legs as a new product in construction machinery industry, analysis of its safety performance and stability will directly affect the market competitiveness of products and user cost. In addition, because of people’s consideration of security, the domestic truck-mounted concrete pump design has always been conservative, and optimizeing the base assembly can effectively reduce production costs, analysis and optimization design of the base assembly is imperative.First, this article describes the truck-mounted concrete pump development of domestic and overseas, analyzes the research status of base assembly, clarify the content and significance of the research project at the same time, and then introduces development tools and theoretical knowledge and object of study.Secondly, using Pro E extraction off different parts of the structure and using the Hype Mesh software selecting suitable element types established the corresponding parts of the finite element model after the structure is simplified. Then, using APDL language to parametric assemble various parts of the structure, including applied loads and constraints, and parameters set the contact and establish the complete structure finite element model.Thirdly, analysing the truck-mounted concrete pump working conditions, using ANSYS and DOS(Disk Operating System) completed base assembly each component finite element static analysis under the arm from 0 DEG to 180 DEG rotation, dealing with the calculation result and understanding base assembly structural deformation and stress distribution situation in the process of arm rotation, understanding the site which stress concentration region and the risk structure, and the dangerous conditions of each component, to prepare for the following structure improvement and optimization.Then, according to base assembly structure finite element calculation results to develop strain test. Using DH5908 strain test system to test the structure strain. Through comparison between calculation results and test results, thus validating whether the simplified finite element model, loads and constraints are really justified and the reliability of calculation results.Finally, based on the accuracy of the finite element method(FEM), according to the calculation results and discuss with the designers to determine the structure which need to improve and optimize. Then,using the ANSYS optimization design technology to optimize the plate that can be optimized and determining the local structure improvement plan. Then, finishing strength and stiffness test on optimized base assembly, indicating the feasibility of the plan of base assembly improvement and optimization. |
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