Finite Element Analysis And Optimization Design On The Bridge Of Sludge Scraper

Water is not only an important part of the Earth, but also is an important resource for the mankind’s survival.With the rapid economic and social development, pollution problems have cropped up, gradually increases the degree of pollution. The increasing serious water pollution not only brings damage to ecosystems, but also means a more serious threat to human survival and development. At the same time, the continuous development of human society has brought the global shortage problem of energy resources. Now China is at a critical period of economic restructuring, under the background of pursuit of cooperation of low-carbon environmental protection and economic development, the energy-saving environmental protection industry has great development prospects.Water treatment equipment manufacturing is an important part of the environmental protection industry. Mechanical equipment used by the sewage treatment is mainly divided into general equipment and special equipment. Sludge machine is a kind of special equipment, the level of sludge equipment development can’t suit with the development of domestic sewage treatment industry, and compared with foreign countries there is still a big gap. How to accelerate the develop speed, improving the technological level of the sludge machine and meeting the growing needs of sewage treatment equipment are the problems facing by China’s sewage treatment equipment manufacturing industry.On the basis of analyzing and summarizing the study state of sludge machine at home and abroad, using ZBGN-20type sludge scraper as research object, then the overall structure, working process and related performance parameters were introduced. The solid model of the bridge on sludge scraper was created in Pro/E environment, the finite element analysis and optimization design of the bridge were made by using ANSYS Workbench.(1) After introducing the overall structure, working processes and related performance parameters of the sludge scraper, the force of the bridge was calculated according to the formula, the solid model of the bridge was built in Pro/E according to the structure parameters obtained from CAD drawing.(2) Importing the bridge model to ANSYS Workbench to carry out static analysis then the equivalent stress contours and deformation contours of the bridge in both cases can be got. Static analysis results verify the reasonableness of the strength and stiffness of bridge and provide the basis for the optimization design of the bridge.(3) Natural frequencies and corresponding vibration modes can be obtained by using ANSYS Workbench to do the modal analysis of the bridge and bearing load beam. The resonance can be prevented by analyzing the deformation trend of bridge.(4) The removable areas on the bridge was identified based on the topology optimization result, it provides a reference for bridge design. In order to reduce the quality of the bridge, the thickness of bridge rod was selected as design variables to do optimization design. The optimization results was handled according to engineering practice, the model of bridge was rebuilt in Pro/E by selecting a new wall thickness, then it was imported to ANSYS Workbench for static analysis to verify the reasonableness of the results.