Construction and Classification of Spiral Classifier

The spiral classifier consists of the bottom of the semi-circular sink, spiral blade, support the upper and lower ends of the screw shaft bearings, screw shaft drive and lifting mechanism.
In the process of flowing the weir to the bottom of the tank, the ore particles begin to settle and decompose. The fine particles are small in sedimentation rate, and the suspended state is discharged by the overflow weir by the overflow, into the overflow; and coarse particles settling speed, sink to the bottom of the tank after the rotation of the leaves transported to the top of the tank, a return to the sand, back to the mill and then grinding.
The spiral blade of the spiral classifier is connected with the hollow shaft by a radial spoke, and both ends of the shaft are mounted in the upper and lower supports, and the low speed rotation is driven by the transmission device at the upper end of the slot. The lower bearing is mounted on the bottom of the lifting mechanism and the upper and lower positions can be adjusted by the lifting mechanism so that the screw is lifted when stopped. To avoid being forced to sink, re-boot caused by overload. At the same time to enhance the body can also adjust the blade and the bottom of the gap to adjust the amount of return.
According to the position of the spiral in the tank and the level of the pulp surface is different, the spiral classifier can be divided into sunken, high Yan and low weir.
The spiral blades of the sinking spiral classifier are immersed in the slurry in 4-5 laps. The area of the subsidence area is large and the depth of the classification tank is deep. The spiral rotation has little effect on the pulp surface. So the grading surface is smooth, overflow production is high, fine particle size, suitable for classification of 0.15mm size of the overflow products. Often in the second part of the concentrator grinding mill and the composition of the ball mill unit.
The overflow weir of the high-Yan type spiral classifier is higher than the lower end bearing of the helical hollow shaft, but lower than the upper edge of the blade, the area of the subsidence area is larger than that of the low weir type and can adjust the overflow weir in a certain range of the height to change the area of the subsidence area, which can adjust the grading of the granularity of the grinding cycle is commonly used in a classification equipment, it is suitable for separation of more than 0.15mm of overflow products, usually in the first paragraph of grinding ore.