Dynamic Analysis And Structure Optimization Design Of The Linear Vibrating Screen

Vibrating screen is widely applied to many industries such as coal industry, used as material classification, washing, dehydration and medium drainaging. Among them, linear vibrating screen has been widely used for its high production efficiency, good grading effect and convenient maintenance. In the process of operation, the vibrating dynamic performance directly influences the screening efficiency and service life. Therefore, it is necessary to research on the vibrating system and its dynamic response, and to optimize the screen structure, making its performance meets the requirements of design and production.This paper took the ZK1230vibrating screen of a mining machinery Co. Ltd. as the research object, made a dynamic study on the screen box and optimized its structure using the finite element software ANSYS12.1, and proposed a new method of adjusting centroid of the screen box, got some optimal results with certain reference value.This paper mainly did the following works:combined with the engineering drawings and vibrating system structure, a finite element model of the ZK1230linear vibrating screen box was established,and modal analysis and harmonic responses analysis have been finished.The results indicate that the structure will have no resonance,but the feeding end has greater displacement and the maximum dynamic stress of the discharging mouth baffle is close to allowable stress value. Based on the above analysis results, the baffle’structure was modified. Meanwhile, centroid of the ZK1230vibrating screen deviated from the line of vibration direction12.0454mm by measuring in UG. One of the most important cause of uneven amplitude is improper centroid position, and traditional method is difficult to achieve optimization purposes.This paper adopted bean’straight line feasible domain method to optimize the screen box and passed the line of vibration direction through the centroid. The dynamic analysis results after optimization show that the new method is reasonable and effective for that the displacement under the working frequency is improved and the stress concentration of the discharging mouth disappears, the maximum dynamic stress also reduces from88MPa to42.3MPa.This paper first time applies the adjusting centroid method to optimize vibrating screen and demonstrate its rationality and validity by testing result. This paper also proposes a new method of adjusting centroid which is named bean’straight line feasible domain method. Combine the vibrating screen’s actual problem with advantages of the traditional centroid design method,the new method offers a new way for transformation of linear vibrating screen and has reference value for other similar problems.