Aggregate Bin Radial Gate

Function

Gate modulation controls the flow rate and weighing accuracy of each aggregate fraction discharged onto the collecting belt. A gate that does not close fully allows aggregate to trickle between batches, producing cumulative weighing errors and cross-contamination of fractions in multi-lane belt arrangements. A gate that opens unevenly or sluggishly restricts throughput and extends the aggregate fill cycle time, directly reducing plant output in m³/h. Fast, positive actuation — full open in under 3 seconds — is essential for fine aggregate cut-off accuracy and high batch cycle rates.

Construction & quality

Gate blades are fabricated from 8–12 mm structural steel plate, stiffened with welded ribs, and faced on the aggregate-contact surface with 6 mm Hardox 400 wear plate. The pivot shaft is precision-machined steel running in grease-nipple-fed bronze or high-load polymer bushings. The hydraulic cylinder (50–80 mm bore, 100–150 mm stroke) or double-acting pneumatic cylinder (80–100 mm bore) is pin-mounted on welded lugs. A rubber blade seal (50–60 Shore A) is vulcanised or mechanically fixed to the gate lower edge to provide dust-tight closure. Gate position is confirmed by inductive proximity sensors or limit switches wired to the plant PLC.

When to replace

• Aggregate trickle or steady flow onto collecting belt with gate confirmed in closed position
• Actuator struggling to open gate under full bin static head — abnormal pressure spike
• Visible cracking, deformation, or breakthrough of the Hardox face plate
• Rubber edge seal permanently compressed flat and no longer providing dust-tight closure
• Gate position sensor not confirming open or closed status to PLC, causing batch sequence fault