New cleaning system to reduce spillage from carryback


Martin has released the Washbox Cleaning System that combines water spray and secondary cleaning blades in a self-contained unit, draining residue safely from work areas.

Designed for heavy to medium duty applications, the system reduces dust spillage from carryback, leading to a safer workplace, longer belt life and less downtime.

Available in two configurations – a Dual Cleaner System and a Single Cleaner System – the units are mounted on the conveyor frame directly after the return idler to ensure alignment throughout the cleaning process and to allow enough time for moisture evaporation on the return trip.

Passing through a powder coated steel box with top rollers, the belt is washed by spray bars equipped with 10 to 30 nozzles delivering up to 4.14 bar of pressure, using 20 to 204 L/min of potable or non-potable water.  The belt is then scraped clean by a polyurethane blade and/or a urethane squeegee blade, set on a tensioner for a tight and consistent blade-to-belt seal. Residue drains through an outlet funnel below the box, which can lead to a disposal unit or a settling pond/vessel for introduction of material back into the process.

The system is equipped with three rollers, four spray bars, two Martin Inspection Doors and two polyurethane secondary cleaners. Recommended for use behind a primary pre-cleaner on the face of the head pulley, the color-coded, urethane secondary cleaners can be specified for acidic or high-temperature materials. Optional tungsten carbide or stainless steel tips increase the effectiveness and durability of the blade against difficult or rocky carryback. The cleaner system can be specified from 762 – 1524 mm in length and 1129 to 1350 mm in height, and fits on most conveyor frames by adding approximately 432 mm to belt widths of 457 to 2133.6 mm.

The Single Cleaner System houses a roller, a secondary blade and a spray bar accessed by an inspection door on either side of the enclosure. Designed for tight-fitting spaces on light to medium duty applications, the compact unit is 381 mm long and can be specified from 864 to 1072 mm in height. The total width of the unit can be determined by adding 17 inches (432 mm) to the belt width of 18 to 48 inches (457 to 1219 mm). Recommended for use in tandem with a pre-cleaner, operators have found these units work well for both indoor and outdoor applications where walkways need to be kept free of clutter and pooling.

Operators concerned with the amount of moisture remaining on the belt have the option of adding a squeegee roller, to effectively address wet carryback.  Set between top rollers, it lifts the belt slightly and “flattens” the layer of water on the surface from an average of 50 microns in thickness to 20 microns.  This allows the water to better evaporate during its return, particularly on shorter conveyors.

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