Aggregate Hopper Liner Plate

Function

Liner plates directly determine hopper service life and the frequency of structural inspection required on the hopper floor and walls. In WMM plants operating two or three shifts per day at 150–300 TPH, hopper liners typically require replacement every 6,000–10,000 loader-hours depending on aggregate mineralogy and maximum stone size. Worn-through liners allow aggregate contact with the structural plate, requiring offline welding repair. Proactive liner replacement on a planned schedule eliminates this unplanned downtime and protects the hopper structural warranty.

Construction & quality

Hot-rolled abrasion-resistant steel, Brinell hardness 400–500 HB, equivalent to international grades AR400 and AR450. Plates are plasma- or oxy-fuel-cut to the exact panel dimensions of the specific hopper bay geometry, then CNC-drilled for countersunk M16 fasteners on the hopper bolt grid. Edges are machine-cut to dimensional accuracy without hand-grinding, preserving the hardened surface layer. Top (wear) face: as-rolled mill surface, providing maximum hardness depth. Bottom face: light mill scale for corrosion resistance during outdoor storage and handling. Full-panel hardware kits are included.

When to replace

• Plate thickness worn to 3 mm or less, confirmed by ultrasonic thickness measurement
• Visible perforation or through-cracking in any plate
• Loose plates from elongated bolt holes or sheared fasteners
• Grooves or pitting appearing on the structural hopper plate visible behind a loose liner
• Aggregate fines leaking through liner plate joints onto the feeder belt below