Patent ID: 7708145

Claim:
A combined dry sorting bed, comprising: a bed surface that is approximately a right-angled trapezoid, wherein the hypotenuse of said bed surface is a material discharging side and wherein the material discharging side comprises a discharging baffle; a backboard for guiding material to roll upwards is set at the approximate right angle side of said bed surface opposite to said material discharging side, wherein a feeding side of said bed surface is wider than a waste-rock discharging end of said bed surface; and, a plurality of air supply ports are provided on said bed surface, wherein said bed surface is arranged with an inclination, wherein the inclination between the longitudinal extension of said bed surface and horizontal plane is from −2° to +4° and the inclination between the lateral extension of said bed surface and horizontal plane is from 3° to +15°; a plurality of strip lattice bars in parallel are positioned at intervals on said bed surface, and said lattice bars extend from the material discharging side, toward the direction of the backboard and waste-rock discharging end to a position where there is a space apart from backboard, the space constituting the waste-rock channel, wherein said bars each have a height, and wherein the heights of said bars descend in turn from said feeding side to said waste-rock discharging end, the heights of the lattice bars between the feeding port and waste-rock discharging end are respectively 120 mm, 100 mm, 80 mm, and 60 mm, and the others are all 40 mm; wherein the angle between said lattice bars and said feeding side is from 32° to 37°; wherein the angle between said backboard and said bed surface is from 45° to 60°; wherein the ratio of length of said feeding side to the longitudinal length of said bed surface is from 60% to 70%; wherein the height of said discharging baffle is higher than ½ of the maximum grain size of the maximum density of sorted material; and wherein said waste-rock discharging end is provided with a waste-rock gate.