... 3. Convenient operation; 4. High efficiency. Spiral Grader1. Usage: Spiral Grader is one of the most widely used ... .2. Structure: Spiral Grader is consist of driving device, spiral, flume, lifting device, lubrication device, support device and so ... high weir type, single and double spiral, and immersed single double spiral classifiers. ModelTypeScrewDiamete(mm)ScrewSpeedm/(min)CapacityFlumeslope ...