The CONSTMACH Log Washer is a twin-shaft scrubbing machine used to clean heavily contaminated gravel and crushed stone by mechanical abrasion. The questions below cover what it produces, the materials it handles, how the scrubbing process works, where it is applied, how wash water is managed, and what maintenance the wear components require.
What does the Log Washer do?
It removes bonded clay, silt, and loam from coarse aggregate through intense stone-on-stone and stone-on-paddle abrasion. The output is clean, coarse aggregate suitable for further screening, washing, or direct use, while the liberated fines are carried away in the wash water.
What materials and feed sizes can it handle?
The machine is designed for gravel, crushed stone, and run-of-mine aggregate with a high content of plastic clay or loam. The standard unit accepts feed material up to 50 mm.
How does the twin-shaft scrubbing process work?
- Two counter-rotating shafts carry hardened paddles arranged in a helical pattern.
- The paddles lift, turn, and convey the material up an inclined trough.
- Abrasion between particles strips clay and silt from the stone.
- Wash water carries the liberated fines to overflow, while clean aggregate discharges at the top.
Where is the Log Washer used?
It is applied in sand and gravel pits, quarries, aggregate washing plants, recycling operations, and mineral processing, typically as the primary scrubbing stage for difficult, clay-rich feed.
How is wash water managed?
Water introduced into the trough flushes the separated fines into an overflow that is directed to settling tanks, clarifiers, or filter presses downstream. This allows solids to be removed and, in many installations, water to be recirculated back to the plant.
What maintenance does it require?
Maintenance focuses on the wear components: the paddles and helical facings, the alloy-steel shafts, and the heavy-duty bearings. Operating at a low shaft speed and using replaceable, abrasion-resistant wear parts is intended to extend service intervals and simplify part replacement.
