Huashengming secondary crushers primarily include two major types: dual-stage crushers (dual-stage screenless pulverizers) and double-roll crushers. Their operating principles are based on dual-rotor relay crushing and dual-roll compression crushing mechanisms, respectively.

secondary crushers

1. Secondary Crusher Dual-Stage Crusher Operating Principle (Core Model)

Specifically engineered for high-moisture, sticky materials, the dual-stage crusher achieves efficient fine crushing through two-stage rotor series crushing. Its screenless design completely eliminates clogging issues.

Dual-Rotor Relay Crushing Process:

Primary Crushing: Material enters the upper rotor zone via the feed inlet, undergoing preliminary crushing through impact and shearing by high-speed rotating hammers (high-chromium alloy material).
Secondary Crushing: Centrifugal force propels the partially crushed material toward the lower rotor, where it undergoes further hammer impact. Simultaneously, high-speed collisions and friction between particles create a “hammer-on-material, material-on-material” effect, achieving secondary fine crushing.
Discharge Control: Crushed material exits directly through hammer gaps without screen restrictions, achieving a discharge particle size ≤3mm (80% ≤2mm).

Screenless Anti-Blocking Design:

Eliminates traditional screen plates, allowing wet and sticky materials (moisture content ≤15%) to pass smoothly without wall adhesion or blockages, enabling continuous operation even during rainy weather.
Modular hammer design facilitates quick replacement after wear (approx. 30 minutes), minimizing maintenance costs.

Applications:

High-moisture materials: Coal gangue, construction waste, sludge, etc. (moisture content ≤15%).
Fine crushing requirements: Tailings resource utilization, sand production (output particle size ≤3mm).

2. Secondary Crusher Double Roll Crusher Working Principle (Auxiliary Model)

The double roll crusher achieves precise particle size control through dual-roll compression and shearing, suitable for medium-hard materials (e.g., gold ore, limestone) in medium-fine crushing.

Compression crushing mechanism:

Two counter-rotating rollers (designed with speed differential) subject feed entering the gap to high-pressure compression and serrated shear forces, fracturing material along weak joints.
Particle Size Adjustment: Hydraulic/spring systems or wedge shims adjust the roll gap (1–50mm) with ±0.1mm precision, enabling controlled output size (1–50mm).

Wear Resistance & Protection Design:

Three-layer roll shell structure:
- Outer layer: High-chromium alloy (HRC 60+)
- Middle layer: High-manganese steel
- Inner layer: Dovetail groove locking
Service life > 2 years (processing capacity > 30,000 tons).
Overload Protection:
Hydraulic system automatically retracts upon encountering foreign objects like rebar, preventing equipment damage.

Application Scenarios:

Hard rock sand production: Granite, basalt finely crushed to 1–5mm.
Dry/wet materials: Moisture content ≤10% (requires scraper to prevent sticking).

3. Secondary Crusher Two-stage vs. Double-roll: Core Differences Comparison