HYDRAULIC CLASSIFIER Russian patent published in 1996 - IPC

FIELD: classifying of loose material by hydraulic method; hydraulic classifying of sands in building industry. SUBSTANCE: hydraulic classifier has housing with hydraulic mixture intake branch pipe and waste drain branch pipe provided at its opposite ends. Housing consists of two chambers with taper bottoms mounted in succession. Mounted inside chambers in way of motion of hydraulic mixture are parallel plates fitted at clearance relative to each other and inclined to level at angle of 35-65 deg. Arranged in top portion of each taper bottom are distributing branch pipes for feeding water. Housing is provided with device for shutting off inter-plate passages of chambers which is made in the form of perforated plates located one above another. Lower plate is secured on one side above outlet hole of hydraulic mixture intake branch pipe and on other side it is secured below inlet hole of waste drain branch pipe; upper perforated plate is located for motion and partial closing of holes of lower perforated plate. Square areas of holes of lower perforated plate increase from hydraulic mixture intake branch pipe towards waste drain branch pipe. Classifier is provided with devices for thickening and unloading finished product which are located in taper bottoms and are made in the form of L-shaped discharge and auxiliary branch pipes mounted in parallel with their inlet ends downward. Classifier is provided with devices for stabilization of consistency of hydraulic mixture and unloaded finished product which are located at inlets of L-shaped branch pipes. Devices are made in the form of measuring reservoirs interlocked with adjustable gate fitted in auxiliary branch pipe feeding water from water supply main. Measuring reservoir inclined bottom and movable gate valve interlocked with float showing level of hydraulic mixture in reservoir. EFFECT: enhanced reliability. 3 cl, 5 dwg