Mixer Trough Liner Plate

Function

By absorbing abrasion and impact in place of the permanent trough structure, liner plates allow the trough shell to remain serviceable for the life of the plant. They also maintain the precise internal clearance between paddle tip and trough surface — typically 5–15 mm — that governs mixing efficiency. Excessive liner wear increases this clearance, causing aggregate slip, prolonged mixing time, and potential motor overload. Liner plates should be inspected at each major service and replaced in full sets to maintain symmetric clearance across both shaft arcs.

Construction & quality

Cast from 13–18% manganese steel (Hadfield grade), heat-treated to maintain a fully austenitic structure with minimal carbide precipitation. Plate faces are machined after heat treatment to achieve flatness within 1.5 mm/m and the correct trough curvature to ±1 mm. Countersunk bolt holes accept M20–M24 hex-socket bolts, ensuring a flush inner face with no protrusion into the mix path. Plates are supplied in mirrored left and right profiles for the twin shafts. A chromium-carbide overlay (CCO) facing is available for sites with unusually hard aggregate (Mohs hardness above 7).

When to replace

• Wear thickness below 10 mm, confirmed by ultrasonic thickness gauge
• Paddle tip-to-trough clearance exceeding 20 mm measured with a gauge bar
• Visible cracks running across the plate face
• Hot spots or shell surface heating detectable after the mixing cycle
• Aggregate fines leaking at liner plate joints or through the bolt countersinks