CSW-75 Screw Sand Washer ( Spiral Sand Washing ) 45-80 m3/h

The CSW-75 represents CONSTMACH's solution for efficient sand and aggregate washing in demanding production environments. This spiral washing system handles capacities between 45 and 80 cubic meters per hour, depending on material gradation, making it particularly suitable for processing fine aggregates that contain excessive clay, silt, or other unwanted particles. The machine operates on a straightforward principle: rotating螺screw paddles lift and wash material while water flows in the opposite direction, effectively separating contaminants from valuable aggregates.

Built around a 750mm diameter screw housed in a 7,500mm long trough, the CSW-75 features twin 7.5 kW motors that drive the screws at a controlled 20 rpm. This relatively slow rotation speed ensures gentle handling of materials while maintaining thorough washing action. The unit processes material in the 0-3mm range at 45 m³/h and can handle coarser 0-7mm feeds up to 80 m³/h. Water consumption sits between 40 and 60 cubic meters per hour, which is moderate for this capacity class and allows for effective recirculation in closed-loop systems.

The construction approach focuses on durability rather than lightweight design. Heavy steel plate forms the main body, providing the structural integrity needed to withstand continuous operation in abrasive conditions. At 5,800 kg, the CSW-75 isn't the lightest machine in its category, but this weight reflects robust engineering rather than over-design. The oil-lubricated gearbox receives particular attention in the design phase, with CONSTMACH's engineering team specifying components with generous service factors. This conservative approach to power transmission extends operational life and reduces the frequency of maintenance interventions.

Rubber paddles attached to the screw shafts handle the actual material contact and lifting. These paddles are replaceable wear items, which is standard practice in screw washer design, but the ease of replacement matters significantly in real-world operations. The CSW-75 allows paddle replacement without extensive disassembly, minimizing downtime during routine maintenance. The twin-shaft configuration distributes the load and provides some redundancy in operation, though both shafts typically run simultaneously during normal use.

Material enters at one end of the trough and progresses along the screw length as it's lifted, washed, and drained. Clean sand discharges at the elevated end while contaminated water and fines flow to the lower end for disposal or further treatment. This counter-current washing principle maximizes the separation efficiency between the desired aggregate and the unwanted fines. The system works particularly well with materials that have been crushed to the 0-5mm specification, where clay and crusher dust often coat particle surfaces and affect concrete quality or asphalt performance.

Installation and commissioning proceed relatively quickly since the machine arrives as a largely pre-assembled unit. Foundation requirements are straightforward, and the connection points for water supply and discharge follow industry standards. Operators appreciate the accessible service points and the logical layout of inspection areas. Regular maintenance involves checking gearbox oil levels, inspecting paddle wear, and monitoring bearing temperatures, all of which follow predictable schedules rather than requiring constant attention.

The CSW-75 fits into production lines where clean, properly graded sand is essential for concrete production or where specifications limit the amount of material passing the 75-micron sieve. It handles the washing duty without requiring excessive water volumes or complicated control systems, which keeps operating costs reasonable and troubleshooting straightforward when issues do arise.