Dynamics analysis and improvement of the four-roll crusher drive design

The paper analyzed vibration transmission to the drive elements of the DChG 900?700 four-roll crusher from the working body during the solid fuel fractional preparation in the sintering shop. A finite element model of the four-roll crusher drive was developed in the SolidWorks software package. The linear dynamic studies were performed on the basis of the method of modal analysis of the dynamic loads time diagram. They made it possible to calculate vibration displacements, rates and accelerations on the roll bearing support housings, outer ring of the low-speed gearbox shaft bearing and bearing boss of the low-speed shaft when using a pin coupling with the elastic disk-type element and a gear coupling in the crusher drive. In conditions of the sintering shop of Branch No. 1 “Alchevsk Metallurgical Plant”, LLC “Southern Mining and Metallurgical Complex”, experimental studies were carried out on vibration characteristics of the DChG 900?700 crusher working bodies when crushing the solid fuel. Results of the experimental study confirmed adequacy of the developed computer model (the average relative error was 19.6%). Decrease in the vibration transmission coefficients was justified: vibration displacement - by 1.85 times, vibration rate - by 1.82 times and vibration acceleration - by 2.05 times, when using a finger coupling with the disk-type elastic element instead of the gear one.

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