半自动翻转弧形筛的设计与计算

为提高弧形筛翻转效率,采用电液推杆作为驱动装置对弧形筛进行局部改进,通过电液推杆的伸长与缩短,完成弧形筛筛箱的放平与竖起,最大限度地保留弧形筛原有结构,减少改造工作量,实现筛箱自动俯仰功能。通过理论计算和运动学仿真分别得到筛箱俯仰转动过程中所需驱动力的变化曲线。结果表明:电液推杆驱动力的理论计算曲线与仿真曲线基本吻合,筛箱俯仰翻转过程中水平姿态启动时所需驱动力最大,随着筛箱竖起角度α逐渐变大,所需电液推杆的驱动力相应减小。考虑计算误差和一定的安全系数,弧形筛选用电液推杆的额定最大推力Fmax为15000 N。改造后的弧形筛在人工操作与机械驱动相互配合下实现了半自动翻转,弥补了传统弧形筛的不足,翻转过程由原来的2 h缩短至10 min以内,有效提高了弧形筛的翻转效率和脱水、脱介效果。

Design and calculation of semi-automatic overturning sieve bend

In order to improve the overturning efficiency of sieve bend,the sieve bend mas transformed by adopting the electro-hydraulic putter as driving device.The sieve bend box was ruffled and flatted by changing the length of electro-hydraulic putter.The box realized the automatic pitching function and most of the original structure of sieve bend was preserved.Variation curves of the drive force in the pitching rotation process were obtained through theoretical calculation and simulation.The results showed that,the theory curve of electro-hydraulic putt？s driving force were consistent with the simulation curve.In the overturning process,the maximum driving force was required to start at level posture,with the screen box erected angle α becomed larger,the driving force required for electro-hydraulic putter reduced according-ly.Consider the calculation error and a certain safety factor,the rated maximum thrust of the electro-hydraulic putter Fmax was 15000 N.Af-ter transformation,the curved screen achieved a semi-automatic overturning as a joint result of manual operation and mechanical drive.The overturning time was shortened from 2 h to 10 min and effectively improved the effects of dehydration,demedium and desliming.