Drum type screening device

The invention relates to the field of tobacco production and discloses a drum type screening device. The drum type screening device comprises a support girder, a plurality of supporting wheel sets are arranged on the support girder and respectively comprise a front supporting wheel and a rear supporting wheel, the front supporting wheels and the rear supporting wheels are symmetrically arranged, and a driving device driving the two supporting wheels of one supporting wheel set to rotate is connected to the support girder; a first grid drum body used for filtering large tobacco leaves is supported on the supporting wheel sets, one end of the first grid drum body is a feed end, the other end of the first grid drum body is a discharge end, the first grid drum body is arranged downwards in an inclined mode in the discharge direction, a protective cover connected to the support girder is connected outside the first grid drum body, and a discharge hopper connected to the support girder is arranged below the first grid drum body. According to the device, the leaves larger than the specific size in threshed leaves are screened out through screen holes of the first grid drum body, the large leaves which are screened out can undergo secondary treatment, and therefore the requirement of the cigarette process specification can be met, and the quality of final products of cigarettes can be improved.