The working principle of Sludge Mixer Mixing Screw Conveyors is based on the coupling of the rotating pushing and stirring functions of the spiral blades. It is mainly used for the transportation, mixing and conditioning of sludge. The specific mechanism is as follows:
The core of the equipment consists of a spiral shaft, spiral blades, a U-shaped or tubular housing, and a drive device. The spiral shaft is arranged along the axial direction, and the blades are fixed on the shaft in a spiral shape. The feed port and the discharge port are set at both ends of the housing. When the drive device (motor + reducer) drives the spiral shaft to rotate, the blades generate axial thrust and radial shear force:
Conveying function:
When the blades rotate, the material (sludge) moves axially due to the thrust of the blades. For low-viscosity sludge, the blades directly push it toward the discharge port; for high-viscosity or high-solid content sludge, the gap design between the blades and the shell (usually 5-10mm) can avoid excessive squeezing, and at the same time, the blade pitch change (such as the pitch decreases from the feed end to the discharge end) can be used to achieve compression and transportation of sludge, thereby improving transportation efficiency.
Hybrid Function:
During the rotation of the blades, the sludge is also stirred radially. The spiral surface of the blades pushes the sludge to flip and shear radially, breaking the agglomeration of the material. If a guide plate is installed in the shell or a variable pitch blade is used, the axial and radial turbulent mixing can be further enhanced, so that the sludge and the conditioning agent (such as flocculant, lime) are in uniform contact. For scenes that require heating or cooling, the shell can be designed as a jacket structure, and a heat medium or a coolant is introduced to accelerate heat exchange through blade stirring.
Special scene adaptation:
For sludge containing fibers or prone to entanglement, variable diameter spirals (with thickened middle diameter) or anti-entanglement blades (serrated edge design) can be used to reduce the risk of fiber entanglement;
When treating highly corrosive sludge, the blades and shell are made of stainless steel (such as 316L) or rubber-lined anti-corrosion materials to extend the life of the equipment;
When the sludge retention time needs to be controlled, the mixing reaction time can be accurately controlled by adjusting the rotation speed or changing the shell length.
The equipment has an integrated design of transportation and mixing, combining process continuity and process flexibility, and is widely used in sludge conditioning, pretreatment before anaerobic digestion, and transportation of solid-liquid mixed materials in sewage treatment plants.
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