APPARATUS FOR MIXING EARTH AND SAND GATHERED ON-SITE

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PROBLEM TO BE SOLVED : To provide an apparatus for mixing the earth and sand gathered on-site, the clogging frequency of which is decreased so that the resistance when an agitator is rotated can be lowered and the deformation of the agitator can be prevented. SOLUTION : This apparatus is arranged aslant so that the upper end is made higher than the lower end and provided with : a charge part 1a which is arranged at the upper end and in which a mixed material containing the earth and sand gathered on-site is thrown; a discharge part 1b arranged at the lower end; a conveying passage 1 for dropping/conveying the mixed material from the charge part to the discharge part while mixing it; a plurality of agitators 2 arranged in the conveying passage along the dropping/conveying direction for scooping up/mixing the mixed material to the direction opposite to the dropping/conveying direction; and a curved plane 3a formed on the bottom surface 1c of the conveying passage along the rotational tracks of agitators for guiding the mixed material toward agitators. Each of agitators has a plurality of blades 5 which are arranged along the axial direction of a rotary shaft 4 at suitable intervals and extended radially from the rotary shaft to the outside in the radial direction. A gap α between the tip 5a of each of the blades 5 and the curved plane is set to be ≥1/2 of the maximum particle size of the earth and sand gathered on-site.