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1. Highlights1. Variable-diameter and variable-pitch spiral: the stock is pressed in a slowly reducing space, so that the dewatering of the stock layer is almost same. 2. Low rotation speed: When there are bulky or hard substances (such as iron ware) in the stock, the impurities will be automatically extruded into the space between helical blades, so as to avoid the damages of the equipment. 3. Adjustable outlet consistency: The screw shaft, with high compression ratio, leads to high concentration of stock, and outlet consistency can be adjusted with pneumatic or manual plunger as per operators demands. 4. Special structure, to prevent slipping of stock and to keep steady the outlet consistency. 5. Closed design, to prevent the overflow of off-flavor; 6. Completely mechanical extruding dewatering, without special requirements of installation height; 7. Highly dewatering efficiency, to deprive over 85% black liquor in the stock. 2. Structure It is composed of driving unit, screw shaft, and screen cylinder. 1. Driving unit: electric motor, gearbox, and coupler, 2. Screw shaft: the first section in contact with stock is the conveyer screw, and the middle part is the conical variable diameter variable-pitch to increase the compression ratio, the filter liquor extraction percentage, and consistency of stock. At the end of the section, a blade-interruption is termed as intercepting section to prevent the impacts on outlet consistency due to uneven inlet consistency. The later part is conveyer screw section. 3. Screen cylinder: it is composed of four sections for input, filtering, compression and outputs, each section in the steel frame structure, and supported with steel skeleton. The outside of filter is a screen plate with big holes to protect screen plate. 3. Technical Specifications TypeGXZDL900GXZDL1000GXZDL1100GXZDL1200GXZDL1300GXZDL1400GXZDL1500Dlametermm900100011001200130014001500capacity of production: t/d507080100160180200Rotational speed: r/m2-3 Intet feed consistency:%8-12 Discharge consisitency: 25-40Power of motor: kw30375575759090Weight of the equipment: T18202426283032