Patent ID: 8800776

Claim:
An air jigging machine ( 10 ) for dry processing of raw materials ( 17 ), comprising: a material-feeding mechanism ( 11 , 12 ); an air funnel ( 28 ); an air supply conduit ( 32 ) for supplying working air ( 35 ) to said air funnel ( 28 ), wherein a pulsing valve ( 34 ) is disposed in said air supply conduit ( 32 ); at least two jigging-material carriers ( 15 , 16 ) for receiving material ( 17 ) from said material-feeding mechanism ( 11 , 12 ), wherein said jigging-material carriers ( 15 , 16 ) are configured to consecutively receive therethrough working air ( 35 ) from said air funnel ( 28 ) and to separate the material ( 17 ) into heavy material ( 18 ) and light material ( 19 ) layers, and wherein said jigging-material carriers ( 15 , 16 ) are disposed one above the other and are jigging from one another by an intermediate space; a wall ( 40 ) for enclosing said intermediate space between said jigging-material carriers ( 15 , 16 ); at least one bypass airline ( 50 a , 50 b ) that branches off from said air supply conduit ( 32 ) downstream of said pulsing valve ( 34 ), bypasses a lower one ( 16 ) of said jigging-material carriers ( 15 , 16 ), and communicates with said intermediate space for supplying an additional working air flow into said intermediate space between said jigging-material carriers ( 15 , 16 ); and a respective discharge device ( 20 ) for each of said jigging-material carriers ( 15 , 16 ) for said material ( 17 ) layered during a jigging process.