Design and Analysis of Vibrating Screen With Vibromotor, Eliminating Bearings

Abstract

Vibrating screen is used for separating materials in different sizes for batching or concrete plant. The problem arises is the frequent failure of the spherical roller bearing within two months of the installation which is required to reduce and to improve the screening process effectively is the aim of the project work.

In order to achieve the required task, design calculation for bearing and shaft are carried out. Which shows it’s a highly mixed-mode loaded condition. To improve life another option is to go for new lubricant and compare properties of new lubricant tungsten disulfide (WS2) with old one is carried out but that also not shows significant improvement of life. Finally in order to achieve the task complete elimination of bearing and introducing vibromotor into vibrating screen and redesign & analysis with vibromotor is carried out.

To fulfill requirement of vibrating screen 50 Hz frequency vibromotor is selected. Maximum amount of vibration is expected from vibrating screen. Hence, it is required that natural frequency of the vibrator screen should be as near as possible to vibromotor natural frequency. Various iterations have been performed in design of vibrating screen to bring its natural frequency close to 50 Hz. Then the design of vibrator screen has been finalized. The model analysis of design is carried out to check deformation & stress patterns which shows deformation & stress are within the permissible limit. To improve damping property of base support, spring support is designed and analyzed. Analysis results are within the permissible limits. Finally, fatigue analysis is done for whole screen and support. Results of analysis shows that frequency, displacement and stresses are within the limits.