Conveyor Belt Scraper Blade

Function

Belt carryback in a WMM plant is particularly damaging because wet aggregate fines build up on return idler rollers, causing eccentric loading and belt mis-tracking, and accumulate on the belt weigher span, distorting the load cell reading and corrupting proportioning accuracy. Effective scraping also reduces conveyor structure corrosion from wet fines and minimises ground contamination beneath the plant — an increasingly regulated aspect of project site compliance. Blade wear is the primary driver of scraper performance loss and must be monitored regularly.

Construction & quality

Two blade types are available: polyurethane (PU) blades at 85–90 Shore A for general aggregate duty and low belt-surface wear — the standard selection — and tungsten-carbide-tipped (WC) blades for high-silica aggregate or sites with severe carryback loads. Both use a 45° or 60° leading-edge contact angle depending on primary or secondary position. Blade segments are 100–150 mm wide, replaceable individually. Holder bar: 50×50 mm square-section EN8 steel, drilled to the plant's scraper mounting points. Spring or torque-arm tensioning maintains 3–8 N/mm contact pressure throughout the blade wear cycle.

When to replace

• Visible carryback accumulation appearing on return idlers between cleaning intervals
• Fine aggregate build-up on the ground directly beneath the head pulley
• Blade contact face worn to 5 mm remaining depth or less
• Score marks appearing on the belt carrying surface (blade backing steel contacting belt)
• Scraper spring or torque arm fully bottomed out with no further take-up travel available