The pedal-operated grinding stone is a traditional yet efficient tool for small-scale sand and aggregate processing. Designed for rural or low-budget projects, it converts manual power into rotational force to crush rocks into usable sand or coarse aggregates.
– Material: High-carbon steel or reinforced granite stone.
– Capacity: 50–100 kg/hour (depending on rock hardness).
– Footprint: Compact, requiring ≤2 m².
– Grit Control: Adjustable pedal pressure regulates output size (0.1–5 mm).
While modern plants use jaw crushers and VSI impactors, pedal grinders serve as auxiliary units for:
1. Pre-crushing soft minerals (e.g., limestone).
2. Emergency backup during power outages.
3. Remote sites with limited infrastructure.
| Parameter | Specification |
|—————–|————————|
| Max Feed Size | 50 mm |
| Output Size | 0.1–5 mm (adjustable) |
| Weight | 80–120 kg |
| Operator Effort | Moderate (1–2 persons) |
Q: Can it replace motorized crushers?
A: No—it’s supplemental for niche scenarios.
Q: Maintenance requirements?
A: Lubricate bearings weekly; replace stone surface annually.
Project: Rural school construction (Nigeria, 2022)
Challenge: No grid power; needed fine sand for mortar.
Solution: Deployed 3 pedal grinders to produce 4 tons of sand over 10 days. Output met ASTM C33 standards for masonry work.
For larger operations, combine with vibrating screens and belt conveyors to semi-automate the process.
