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Working principle of stacked screw sludge dewatering machine

Working principle of stacked screw sludge dewatering machine

Jul 27, 2019

1. Working principle

Concentration: When the screw pushes the shaft to rotate, the multiple solid laminations disposed on the periphery of the push shaft move relative to each other. Under the action of gravity, water is filtered out from the relatively moving lamination gap to achieve rapid concentration.


Dehydration: The concentrated sludge moves forward with the rotation of the screw shaft; along the exit direction of the mud cake, the pitch of the screw shaft gradually becomes smaller, the gap between the ring and the ring gradually becomes smaller, and the volume of the spiral cavity shrinks continuously. Under the action of the back pressure plate at the outlet, the internal pressure is gradually enhanced. Under the continuous driving of the screw push shaft, the water in the sludge is squeezed out, and the solid content of the filter cake is continuously increased, finally achieving continuous sludge. Dehydration.


Self-cleaning: The rotation of the screw shaft pushes the swimming ring to rotate continuously. The device relies on the movement between the fixed ring and the swimming ring to realize a continuous self-cleaning process, thereby cleverly avoiding the clogging problem that is common in the traditional dehydrator.


2. Construction principle

The stacking screw body of the dehydrator is a filter device formed by a fixing ring and a swimming ring stacked on each other, and a screw shaft is formed therethrough. The front section is the enrichment section and the rear section is the dehydration section. The filter slit formed between the fixed ring and the swimming ring and the pitch of the screw shaft gradually become smaller from the concentrating portion to the dehydrating portion. The rotation of the screw shaft pushes the sludge from the enrichment section to the dewatering section, and also continuously drives the swimming ring to clean the filter joint to prevent clogging.


3. Dehydration principle

After the sludge is concentrated by gravity in the enrichment section, it is transported to the dehydration section. During the advancement process, as the filter joint and the pitch gradually become smaller, and the back pressure plate blocks, a large internal pressure is generated, and the volume is continuously reduced. To achieve the purpose of full dehydration.

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