Substance collecting apparatus for precipitation classifying device

A solid substance collecting apparatus for a precipitation classifying device, comprising:

• a classifying tank for holding a liquid containing solid substances dispersed therein,
• a partition part disposed at a lower part of the classifying tank,
• a liquid-substance separating tube for separating the liquid and the solid substances dispersed therein,
• a reservoir tank for accumulating the liquid,
• a first pipe having one end and first and second other ends which diverge from a diverging point, wherein the one end is connected with the partition part, the first other end is connected with a lower part of the liquid-substance separating tube, and the second other end is in contact with the liquid in the reservoir tank,
• a second pipe having one end connected with an upper part of the liquid-substance separating tube and an other end in contact with the liquid of the reservoir tank,
• a third pipe having one end connected with a substance collecting open outlet of the liquid-substance separating tube,
• a pump connected to the first pipe and disposed between the reservoir tank and the diverging point,
• a first electrovalve in reversibly closing relationship with the first pipe and disposed between the diverging point and the partitioned part,
• a second electrovalve in reversibly closing relationship with the first pipe and disposed between the diverging point and the pump,
• a third electrovalve in reversibly closing relationship with the first pipe and disposed between the diverging point and the liquid-substance separating tube,
• fourth and fifth electrovalves, each in reversibly closing relationship with the third pipe, having an interval therebetween, and
• control means for controlling the reversibly closing relationships of the respective first, second, third, fourth and fifth electrovalves and movement of the pump.