Single screw press structure
In principle, after being cooked, the pulp is injected into single screw press. Then, the water and black liquor are separated from the pulp by squeezing, so as to achieve the purpose of black liquor extraction. Meantime, due to the squeezing of pulp actually produces the result of impressafining.
Composition of single screw press
Single screw press has many parts including feeding bearing, screw shaft, main bearing, filter drum, intermediate support, reel, feed port, foot section, a discharge port, rack, hood, air cylinder, loading plug, transmission and etc.
The main part of single screw press as below:
- Transmission: variable-frequency drive, motor, retarder, coupling, and etc. The speed of the spindle can be adjusted by the variable-frequency drive. When the speed of the screw shaft is increased, the production capacity of the equipment can be improved. When the speed of the screw shaft is reduced, the dryness of the exporting material can be improved.
- Screw shaft: at first, the pulp is connecting with a screw conveyor. In the middle part, screw shaft increases the compression ratio, ratio of filtrate extraction and dryness of pulp. Finally, the latter part is a high-pressure screw, from the feed port to discharge port, screw pitch of screw blade are ordered from small to big.
- Sieve drum: It includes inlet section, the pre-filter section, the filter section, the compression section, and the outlet section and so on. The inner layer of the sieve drum is the mesh, which is made of stainless steel plate, the aperture from the inlet to the discharge port are arranged from small to large.