Dynamic And Acoustic Characteristics Of The Vibrating Screen Based On The ROSTA Damping Support

With the development of the national economy, the social demand for coal is increasing. Large-scale, high efficiency and high precision become the major trends of vibrating screen. Under the trend of large-scale, vibration intensity of equipment will raise continually. The key of the research is how to make the dynamic load passed from vibrating screen to the foundation as small as possible with large capacity and high working efficiency. Even though with low price and simple structure, the common metal spring remains some disadvantages such as poor vibration isolation efficiency and large noise. A new vibration reduction support-ROSTA is studied in this paper. The excellent characteristics of the ROSTA damping support were indicated through experimental studies, which provide a new method for the study the Vibration isolation of large vibrating screen.The static analysis and dynamic analysis was taken, respectively with Workbench based on FEM. The results show that the stiffness of the ROSTA decrease under larger force, which is similar to the spring with negative stiffness. Through these the stiffness curves were obtained.The working principle of linear vibrating screen was analyzed. By combing the vibrating screen and ROSTA damping support as a system, the calculated principle of dynamic stiffness and damping coefficient of the system were theoretically expounded, and the dynamic characteristics of ROSTA damping support were researched from the two areas. Based on the theoretical analysis, the dynamic stiffness and damping coefficient of the ROSTA damping support in the vertical and horizontal direction were obtained, respectively through the experimental study. They’re ky=41612N/m, cy=78.45N·s·m-1, kx=14025N/m, cx=41.91N·s·m-1.It was indicated that lateral stability and control performance for resonance phenomenon in the start-stop process of the ROSTA damping support are much better than metal spring through the contrast experiments between the ROSTA damping support and metal spring. Forever the theoretical isolation coefficient of ROSTA is much larger than metal spring. The system was analyzed by combing dynamic and static. Based on which, it was obtained that the stiffness of ROSTA decreases gradually as the force increases through the static experiment.The methods of noise source identification were described, and sound intensity method was determined to identify the noise source in this thesis. Based on the analysis of the analysis on the principle of sound intensity, the sound intensity of thesurface of the equipment was measured through experiments on the whole vibratingsystem on working state, and the location of the noise source was determined. In orderto study the acoustic characteristics of ROSTA damping support, and verify the noisereduction performance, contrast experiments against metal spring was operated.Sound pressure was measured in the same position. The noise reduction effect wascompared between the two vibration reduction supports by the sound pressure. Thedifference is about38dB.