Granularity Accurate Screening Performance Analysis And Sizing Screen

The thesis firstly introduces the development of sieving machine at home and abroad. In order to meet the requirement of the domestic and international markets for precision sieving of material particles, a kind of high-precision size-grading vibrating screen was designed. The compound mode of some vibration exciters was first applied in this machine, which attaining the separate screening and transportation of material, resolving the problem of visco-blocking and full screening of material.With this vibrating screen, this thesis mainly completed the following research work from theory and the trial.1. Analysis the working principle of this vibrating screen, calculate some related parameters, such as exciting force. The dynamics model about the shaker is setup. Analysis its kinematics and dynamics parameters, and research the change of the output as some vibration parameters change.2. The thesis conducts a comprehensive and system analysis of trajectory of the screen frame, gives the equation of locus, obtains the geometric locus and parameters value of the screen frame by computer simulation. And validates the correctness of theory analysis by comparing the calculating date with test date.3. Theoretical analysis is conducted from the view of material's movement and probability theory, by which the factors that influence the screening efficiency are pointed out. In addition, the vibration isolation performance of this system is analyzed.4. With this vibrating screen, the factors that influence the screening efficiency are mainly studied by experiment, such as the time, amplitude, vibration frequency and properties of material. So as to find more reasonable parameters and achieve higher screening efficiency.By analyzing and researching, the conclusions and datas that obtained provide the theory and fact proof for the vibrating screen's optimum design and intelligent use.