辊搓圆筒筛式谷子清选装置设计与试验

Design and Test of Cleaning Device for Roller Rubbing Cylinder Sieve of Millet

为解决谷子初脱后因物料中残留谷码多、含水率高而导致清选含杂率和损失率较高的问题,设计了辊搓圆筒筛式谷子清选装置。该装置主要由谷码辊搓装置、圆筒筛装置、横流风机和离心风机等组成,实现了先脱谷码后清选的功能。选取离心风机转速及角度、横流风机转速、圆筒筛转速和谷码辊搓装置主动辊转速作为试验因素,籽粒含杂率和损失率作为试验指标进行了正交试验,试验表明:谷码辊搓装置主动辊转速250 r/min、离心风机角度3°、小圆筒筛转速60 r/min、离心风机转速700 r/min、中圆筒筛转速60 r/min、大圆筒筛转速70 r/min,横流风机转速600 r/min为该清选装置的最优组合。对该参数组合进行验证试验,并对该装置清选性能进行对比试验,结果表明,在最优组合条件下籽粒含杂率为1.64%、总损失率为0.86%,该装置籽粒含杂率与总损失率均低于传统型风机圆筒筛式和风机振动筛式清选装置。

In order to solve the problem of high impurity rate and loss rate caused by the residual grain codes and the high moisture content in the raw material of millet after the first stripping,a roll-twist cylinder screen type of millet cleaning device was designed.The device was mainly composed of spikelet roller rubbing device,cylinder screen device,cross flow fan and centrifugal fan,which realized the function of clearing millet code first and then cleaning it.The rotating speed and angle of centrifugal fan,speed of cross flow fan,rotational speed of cylinder screen as well as the rotational speed of spikelet roller rubbing device were selected as the test factors,the impurity rate and the loss rate were taken as the test indexes for the orthogonal test.Results of orthogonal test showed that the optimal combination of the cleaning device was the rotation speed of spikelet roller rubbing device as 250 r/min,the angle of centrifugal fan as 3°,the speed of small cylinder screen as 60 r/min,the speed of centrifugal fan as 700 r/min,the speed of medium cylinder screen as 60 r/min,the speed of large cylinder screen as 70 r/min,and the speed of cross flow fan as 600 r/min.The combination of the parameters was tested and the cleaning performance of the device was compared,under such conditions,the impurity content was 1.64%,the loss rate was 0.86%,the impurity rate and loss rate of this device were lower than those of traditional fan cylinder screen and fan vibrating screen cleaning device.