Tandem waterwheel trommel

A tandem waterwheel trommel apparatus comprising:

• a main body formed by integrally coupling a laterally-disposed drain-off drum and a classifying drum by a pipe, said main body having a front end and a rear end, said drain-off drum disclosed toward said front end and said classifying drum disposed toward said rear end;
• a base provided under said main body to rotatably support said main body;
• a drive unit provided on said base and connected to said main body to rotate said main body;
• a front end plate and a rear end plate each having a generally toroidal shape and respectively formed at opposite ends of said drain-off drum;
• a plurality of buckets formed on an inner surface of said drain-off drum said buckets each having an advancing side facing the direction of rotation of said drain-off drum, a trailing side facing away from the direction of rotation of said drain-off drum, and an inner end portion disposed inwardly away from said drain-off drum inner surface;
• gutters provided on said trailing side of said inner end portions of said buckets;
• drain holes formed in said rear end plate so as to communicate with said gutters to provide fluid communication between the outside of said main body and said gutters;
• overflow holes formed in said rear end plate proximate said drain holes;
• a fixed chute provided inside said drain-off drum, extending to said classifying drum and inclined so as to be reduced in level from said drain-off drum to said classifying drum;
• said classifying drum having a front cylindrical portion and a rear truncated-cone portion disposed so that said front cylindrical portion is generally between said drain-off drum and said rear truncated-cone portion, said truncated-cone portion being formed by a porous plate defining its circumferential surface, said cylindrical portion being formed by wire netting defining its circumferential surface;
• a fixed bath for partially accommodating said classifying drum, said fixed bath having a circular-arc shape in a transverse section and having a bath front end portion and a bath rear end portion, with said bath front end portion disposed closer to said drain-off drum than said bath rear end portion is disposed to said drain-off drum;
• said cylindrical portion having on its outer surface a screw rotatable in said fixed bath;
• said fixed bath having a channel formed in its bath rear end portion, said channel having a circular-arc shape in a transverse section;
• scoop-up buckets provided on said classifying drum and formed so as to be rotatable in said channel;
• and
• a spraying nozzle provided above said classifying drum.