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Function Introduction of Sand and Gravel Crushing Production Line
A sand and gravel crushing production line is an integrated system that processes raw stones into high-quality, size-specific aggregates. It is a core facility for construction, highway/railway, water conservancy projects and concrete mixing plants, with key functions as follows:
1. Feeding and Preliminary Screening
The line starts with a vibrating feeder, which uniformly conveys bulk raw materials (limestone, granite, etc.) from the hopper to the primary crusher. It also screens out soil and dust, ensuring crushing purity and reducing equipment wear.
2. Multi-Stage Crushing
Crushing is the core, realized via three stages to reduce particle sizes:
Primary: Jaw/gyratory crusher turns large stones (hundreds of mm) into 100-300mm chunks.
Secondary: Cone/impact crusher further crushes them into 20-80mm medium particles.
Tertiary (sand making): Vertical shaft impact crusher produces 0-5mm fine sand with rounded shapes, enhancing concrete performance.
3. Screening and Classification
A vibrating screen separates materials post each crushing stage. Qualified aggregates go to finished piles; oversized ones return for reprocessing, forming a closed loop to meet national/industry standards.
4. Optional Washing & Environmental Control
For high-purity needs (e.g., high-grade concrete), a sand washer removes dust and mud to boost sand quality and sand-cement adhesion. Modern lines use bag filters to capture dust and sound insulation/damping bases to reduce noise, complying with environmental rules.
5. Automatic Control
Advanced lines have automatic systems for centralized monitoring. Operators adjust feeding speed, crushing gap, etc., via the control panel. Fault alarm and self-protection functions cut maintenance costs and risks.
In short, the line integrates feeding, crushing, screening, purification and environmental protection. It enables efficient, high-quality and green aggregate production, essential for modern construction.

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