【正文】 When E 2 S 2 +C 2 H 2 +2 ESCH=0, the trace of point D is a line. When E =Sand C =H, the trace of point D is a circle. In general. (6) expresses the equation of an xoy coordinate was rotated γ degrees anticlockwise to give a new set of x ′ oy′coordinates. A standard elliptical equation was then obtained after eliminating D D x y in Eq.(7). 7 From this we know that some points on the screen move in a line or a circle while others move in an ellipse .As long as the relative position of the rotating center of the eccentric block and the center of gravity are properly adjusted, variable elliptical motion of the screen will be obtained .This provides a reasonable throwing index and material delivery velocity and improves screening efficiency. Analysis of motion trace and screening efficiency The stable solution of a vibrating system, in terms of the vibrating screen, can be given by The equations of motion for any point on the vibrating screen are 8 Eq.(8)shows that the center of gravity traces an approximate circle and that the amplitude in the horizontal and vertical directions is between mm and 5 shows how the center of gravity moves in three degrees of gives the angular phase difference between the horizontal and vertical directions as well as the amplitude of the swing angle. 5 Conclusions 1)A new vibrating screen with variable elliptical motion trace was proposed according to the principle of screening process with constant bed points on the vibrating screen trace different elliptical motion pattern agrees well with the ideal motion characteristic for a screening surface. Thus,screening capacity and process efficiency can be increased. 2)A theoretical kinematic analysis of the vibrating screen was done to study how varying different parameters affects the motion of the parameters of the vibrating screen that motion traces are linear,circular or elliptical are obtained. 3) Motion traces of total vibrating screen were gained through puter technological parameters,including amplitude, velocity and throwing index,of five specific points along the screen surface were calculated. These parameters are related to screening efficiency. The results show that the motion pattern of the designed vibrating screen conforms to an ideal screening motion and that the design is able to effectively improve screening efficiency. 9 4)The position of the exciter axle center,relative to the center of gravity of the vibrating screen,is extremely important for screening ,we can design a vibrating screen with higher processing capacity without increasing power consumption by adjusting the relative position of the axle is a point that requires further study. References [1]Wen B C,Liu F and Application of Vibration :China Machine Press,1982. [2]Gu Q B,Zhang E on plexlocus vibration amp。獲得了 線性的 、圓形或橢圓形的運動軌跡振動篩的運動學參數 。運動在 振動篩 上到處都遵循相同的路徑 ,所以 振動篩有恒定 的運輸速度和拋擲指數 ，從而 導致 低的篩分效率 。振動篩給予物料顆粒的能量被大量的浪費。常見的篩分特性如圖 1. 12 振動篩 表面的理想 運動 和 實施方案 振動篩 表面的理想運動描述如下 ， 根據篩選過程的 等厚篩分原則。這在實際應用 是 麻煩的尤其是在控制粒狀材料 不同 的分布 這方面。振動篩的大小為 m m ， 進料粒度是 0 到 50 毫米和分類粒度是 6毫米 。先前的研究忽略了振動篩水平方向上的彈性力與豎直方向上的擺動 [3,11]。當 E=S， C=HS 時， D 點的軌跡是圓。這提供了一個合理的拋擲指數和材料傳遞速度并提高篩分效率的方法。由此獲得直線、圓形或橢圓形軌跡的振動篩的運動學參數線性。 17 參考文獻 [1] Wen B C,Liu F .北京：中國機 械出版 ,1982 [2] Gu Q B,Zhang E 篩 研究 . 1998(1):42– 46 [3] Hao F ：