【正文】 nter 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。screening process with constant bed thickness。Technology,2021,16(4):399– 403. [7]Zhang E ,Crushing and Dewatering Equipments. Beijing: China Coal Industry Publishing House,1991. [8] Khoury D Cleaning Technology .USA:Noyes Data Corporation,1981. [9]Shang N X,Na J elliptical vibration screen. Miningamp。振動篩的不同部分有著不同的橢 圓運(yùn)動軌跡，由此產(chǎn)生的運(yùn)動與理想的運(yùn)動軌跡相吻合。振動篩 有一個適當(dāng)?shù)膾仈S指數(shù)和高一點(diǎn)材料 傳遞 速度的中間 部分 。 3 變橢圓軌跡振動篩的動力學(xué)模型分析 我們使激振力偏離中心，來改變新的振動篩的運(yùn)動模式。39。這些參數(shù)與篩選效率相關(guān)。 2)振動篩的運(yùn)動分析理論是研究各種不同的參數(shù) 是 如何 影響 振動篩 的動作 的。 14 4 變橢圓軌跡振動篩的運(yùn)動和篩選的效果分析 運(yùn)動參數(shù)的分析 運(yùn)用多自由度振動理論來找到一個強(qiáng)迫振動的穩(wěn)定解 [13]，如下： 15 當(dāng) 2 2 2 2 20E S C H ESC H? ? ?， D 點(diǎn)的軌跡是一條直線。 我們設(shè)計(jì)了一個基于理想 振動篩運(yùn)動軌跡的 新的變橢圓 軌跡 振動篩用于原煤分類。這導(dǎo)致了物料的垂直深度在入料端厚，而在出料端薄，進(jìn)而影響了篩分效率和處理能力。振動篩 ，如直線振動篩、圓振動 篩 或橢圓振動篩， 都 有一個簡單 的 平移運(yùn)動。 L1 and L2 the distances between each supporting spring and the center of gravity’s the distance between the rotating center of the eccentric block and the center of gravity。 dynamic model。Processing Equipment,1990(2):20– 24. [10] isopachous screening technology andits and Pall