分级机的工作原理
　　分级机是借助于固体粒大小不同，比重不同，因而在液体中的沉降速度不同的原理，细矿粒浮游在水中成溢流出，粗矿粒沉于槽底。由螺旋推向上部排出，来进行机械分级的一种分级设备，能把磨机内磨出的料粉级于过滤，然后把粗料利用螺旋片旋片旋入磨机进料口，把过滤出的细料从溢流管子排出。该机底座采用槽钢，机体采用钢板焊接而成。螺旋轴的入水头、轴头、采用生铁套，耐磨耐用，提升装置分电动和手动两种.
　　分级机主要有高堰式单螺旋和双螺旋、沉没式单螺旋和双螺旋四种分级机。分级机主要由传动装置、螺旋体、槽体、升降机构、下部支座（轴瓦）和排矿阀组成。分级机广泛适用于选矿厂中与球磨机配成闭路循环程分程分流矿沙，或用在重力选矿厂中来分级矿砂和细泥，及金属选矿流程中对矿浆进行粒度分级，及洗矿作业中的脱泥、脱水等作业。

　　The working principle of a classifier
　　The classifier is based on the principle that the settling speed in liquid varies due to the different sizes and densities of solid particles.Fine ore particles float in water and overflow,while coarse ore particles settle at the bottom of the tank.A classification equipment that is pushed upwards by a screw to perform mechanical classification.It can filter the material powder ground in the mill,and then use spiral blades to rotate the coarse material into the feed port of the mill,and discharge the filtered fine material from the overflow pipe.The base of the machine is made of channel steel,and the body is welded with steel plates.The inlet head and shaft head of the spiral shaft are made of cast iron sleeve,which is wear-resistant and durable.The lifting device is divided into two types:electric and manual
　　There are four main types of classifiers:high weir single helix and double helix,submerged single helix and double helix.The classifier mainly consists of a transmission device,a spiral body,a groove body,a lifting mechanism,a lower support(bearing),and a discharge valve.Graders are widely used in ore dressing plants to combine with ball mills to form a closed circuit circulation process for separating ore sand,or in gravity ore dressing plants to classify ore sand and fine mud,as well as in metal ore dressing processes for particle size classification of slurry,and for operations such as desliming and dewatering in ore washing operations.