RXLK型螺旋洗砂机 Serew wash-sand machine

一、用途及使用范围

1、用途：RXLK型螺旋洗砂机适用于建筑工地、砂石厂、玻璃厂、水电站等单位用砂石所需的洗选、分级和脱水，同样适用于选矿厂，经磨矿后对矿石的分级。

2、适用范围洗选粒度≤10㎜。

二、工作原理

螺旋洗砂是倾斜布置的水槽下部形成的沉淀，螺旋头部没入沉淀池内，螺旋由电机经减速机减速驱动螺旋旋转，由沉淀池底部多孔板给清洗水，从而完成清洗、脱水和分级三种功能。

清洗：砂石进入沉淀池，在转动的螺旋作用下，使砂石翻滚并相互磨擦，除去覆盖砂石表面上的杂质，同时破坏包覆砂石粒的水气层，以利于脱水，由多孔进入的清水形式上升水流，将比重小的颗粒及其它杂质带到水面经溢流堰流出，完成清洗作用。

脱水：比重大的颗粒沉入水槽底，在水槽底弯板一边。则螺旋将砂石向下推进，由于水槽长度超出下部水线，但有一个合适的长度，在向上推进的过程中，除去砂石中多余的水份，脱出的水从槽底另一侧排水沟流入沉淀池，砂石则从水槽上端排出。

分级：物料的分级是通过将不符合标准要求的细颗粒溢出堰来实现的，其控制办法：调整溢流堰高度及调整螺旋转速。

1．Use and application range

A．Use ：RXLK type screw sand washer is applied to washing, classification and dewatering of sand-gravel in construction site, freestone factory, glass factory, hydropower station and others. It also is applied to classification of ore ground in beneficiation plant.

B．Applicable range of washing grain size:≤10 mm.

2、Operation Philosophy

Screw sand washing is to form precipitation in the lower part of inclined water tank and screw is submerged in its front part in precipitation pond. Screw is driven by motor through speed reducer. Three functions of washing, dewatering and classification of material are  accomplished by supplying clean water from porous plate at the bottom of precipitation tank.

Washing：Sand-gravel sent into precipitation tank is threshed and frictionated under the action of rotation of screw to remove impurity on surface of the sand-gravel, at the same time, to destroy water-gas layer containing sand-gravel to be damaged for helping dewatering.  Under the action of rising water flow from porous plate, grains with small specific gravity and other impurities are brought to water surface and discharged through overflow weir before washing process is completed.

Dewatering：Grains with large specific gravity settle in one side of bend plate of the water tank bottom. Sand-gravel is pushed downward by screw. Length of water tank exceeds lower water line. With appropriate length ,excessive water in sand-gravel is removed in the process of upward movement and dewatered water flows into precipitation tank from drain channel at another side of water tank bottom. Sand-gravel is discharged from the water tank through its upper end.

Classification：Fine grains under standard of size are discharged through overflow weir to make classification of materials with classification control method being control of height of overflow weir and rotating speed of the screw.