The vibrating screen plays a critical role in aggregate manufacturing, determining the final size and quality of your aggregates. If screening efficiency drops, oversize aggregates pollute your product piles, leading to NHAI project rejections. Vibrating screens operate under severe centrifugal forces, making them highly susceptible to blinding, pegging, and structural wear. SREW's comprehensive vibrating screen guide helps you resolve these issues.
1. Screen Blinding vs. Screen Pegging
Operators frequently confuse these two distinct screening issues, which require different solutions:
- Screen Blinding (Moisture Clinging): Wet, clay-like fines stick to the screen wire surface, gradually bridging mesh openings until the screen acts as a solid plate. This is highly common during the monsoon season.
- Screen Pegging (Near-size Wedging): Rocks that are almost identical in size to the mesh openings get wedged directly inside the mesh. This prevents other aggregates from passing through and drops screening capacity.
2. Vibrating Screen troubleshooting Table
This table details common vibrating screen issues, their root causes, and SREW's recommended technical solutions.
| Screening Problem | Potential Root Cause | Recommended Action & Solution |
|---|---|---|
| Micro-fine aggregate blinding | Wet quarry feed dust clinging to mesh | Install SREW high-pressure spray water bars or self-cleaning mesh |
| Near-size rock pegging | Aggregate particles wedged inside mesh slots | Switch to polyurethane mesh or slotted wire screens |
| Screen frame vibrates unevenly | Broken or weakened coil springs | Inspect coil springs and replace in matched sets |
| Centrifugal amplitude drop | Eccentric shaft speed drops / loose belt drive | Check and adjust drive belt tension and motor speed |
| High bearing temperature / noise | Lack of lubrication or grease contamination | Use EP-2 grease weekly and replace worn labyrinth seals |
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