Overview
The double-stage crusher without screen bottom is a specialized industrial machine engineered to crush medium-hard materials efficiently. Unlike traditional crushers, it omits the screen bottom, minimizing blockages and maintenance downtime. Its dual-stage design integrates primary and secondary crushing into one unit, delivering finer particles (3-5mm) in a single pass. Commonly used in mining, construction, and cement industries, it balances high throughput (20-100 t/h) with energy efficiency. This crusher is particularly suited for brittle materials like limestone, coal, and gypsum. Its no-screen-bottom structure allows continuous operation even with moist or clay-rich feed, reducing the risk of clogging. The compact design and modular components also simplify installation and scalability for B2B operations.
Structure and Working Principle
The crusher comprises a rotor assembly with dual-stage hammers, crushing chamber, and drive system. In the first stage, large feed material is broken down by high-speed rotating hammers. The partially crushed material then moves to the second stage, where finer hammers further pulverize it to the target size. The absence of a screen bottom ensures uninterrupted material flow. Key structural components include replaceable manganese steel hammer heads, alloy liners for wear resistance, and a heavy-duty base frame. The motor drives the rotor via V-belts, allowing adjustable speed for different materials. Dust-proof bearings and labyrinth seals enhance durability in harsh environments. The open discharge design eliminates particle size limitations imposed by traditional screens.
Key Features
1. **No Screen Bottom**: Eliminates clogging from sticky or wet materials, reducing downtime by up to 30% compared to screened models. 2. **Dual-Stage Crushing**: Achieves finer output (3-5mm) without secondary equipment, cutting energy costs by 15-20%. 3. **High Adaptability**: Handles varying moisture content (up to 15%) and impurities like clay or soil. 4. **Low Maintenance**: Modular hammer design allows quick replacement without disassembling the rotor. Additional advantages include vibration damping for stable operation and optional silencers for noise-sensitive areas. The crusher's output can be adjusted by modifying hammer gaps (10-50mm), making it versatile for different industries.
Application Areas
1. **Mining**: Pre-crushing coal, gypsum, or phosphate ore before further processing. 2. **Construction**: Producing fine aggregates from demolition waste or natural stone. 3. **Brickmaking**: Crushing raw materials like shale or clay to uniform granules. 4. **Cement Plants**: Preparing limestone and other additives for kiln feed. This crusher is also deployed in chemical plants for breaking lumpy raw materials and in biomass facilities for processing organic residues. Its ability to handle heterogeneous feed makes it popular in recycling operations.
Maintenance and Precautions
Regular maintenance ensures optimal performance and longevity. Inspect hammer wear every 200 operation hours; replace if thickness reduces by 30%. Lubricate bearings with high-temperature grease every 150 hours. Check belt tension fortnightly to prevent slippage. Avoid overloading the crusher—feed material should not exceed 80% of the inlet size (typically 200x200mm). Remove metal contaminants with a magnetic separator to prevent rotor damage. For moist materials, periodically clean the inner walls to prevent buildup. Always power off before inspections to ensure safety.
B2B Procurement Guide
When sourcing this crusher, prioritize suppliers with ISO 9001 certification and a proven track record in heavy machinery. Key considerations: 1. **Capacity**: Match throughput (t/h) to your production volume; mid-range models (50 t/h) suit most SMEs. 2. **Customization**: Opt for adjustable hammer gaps and optional dust collectors if needed. 3. **After-Sales**: Ensure availability of spare parts (hammers, liners) and on-site technical support. Request material certifications for critical components like hammer heads. Compare energy efficiency ratings—models with IE3 motors reduce long-term costs. For reference, a 30 t/h unit typically costs $8,000–$12,000, while larger 100 t/h units range up to $20,000.
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