The double-tooth roller coal crusher is a crushing device specifically designed for medium-hardness brittle materials such as coal, coke, and coal gangue. It achieves efficient crushing through the squeezing force and shearing force generated by the relative rotation of the two rollers. The following are its core characteristics and technical points:
models of double roller crusher
1、 Core Structure and Working Principle
1. Structural Composition
Crushing Rollers: Two parallel toothed rollers (fixed roller + movable roller), with roller surfaces made of high-chromium alloy or tungsten carbide overlay welding for wear-resistant tooth profiles (e.g., wolf teeth, spiral teeth).
Overload Protection: The movable roller is equipped with a spring or hydraulic cushioning system, which automatically increases the roller gap when encountering hard objects like iron blocks to protect the equipment.
Adjustment System: A hydraulic or mechanical device precisely controls the roller gap (0.5–30 mm) to adjust the output particle size.
Drive System: Motor → hydraulic coupler → reducer → gear transmission, ensuring synchronous counter-rotation of the dual rollers.
2. Working Principle
Material enters the V-shaped crushing chamber and is crushed by the squeezing and shearing action of the dual rollers; qualified particles fall through the roller gap, while oversized material is returned by the toothed rollers for secondary crushing. During overload conditions, the movable roller compresses the spring and retracts, then resets after expelling the foreign object.
Modular gear sleeve design allows for quick replacement of locally worn parts; hydraulic cover opening for maintenance allows a single person to adjust the roller gap within one hour.
3、 Typical Application Scenarios
1. Coal Pre-processing
Coarse crushing of raw coal: Crush raw coal with a size of ≤300mm to 30–50mm for washing, sorting, or combustion (e.g., the 2PG1200×1000 model at a power plant, with a production capacity of 120 tons per hour).
Fine crushing of coke: Crush coke to ≤3mm for blast furnace injection, with an over-crushing rate of <5%.
2. Mining and Construction Materials
Coal gangue crushing: Processing raw coal containing gangue, with output ≤50mm, directly fed into the coal washing process.
Limestone medium crushing: Secondary crushing after jaw crushing to produce 5–10mm aggregate for cement raw material grinding.
3. Environmental Protection and Recycling
Construction waste processing: Mobile crushing stations integrated with double-tooth rollers produce 0–5mm recycled sand and 5–20mm aggregate.
4、Key technical parameters
Parameters
Typical values
Description
Maximum feed size
≤300mm (coal)
The larger the diameter of the tooth roll, the stronger the biting capacity.
Discharge particle size
0.5–30 mm (adjustable)
Coke is commonly crushed to 2–3 mm, while aggregate is commonly crushed to 5–10 mm.
Processing capacity
50–400 t/h
Formula:
Q=3600⋅μ⋅H0L⋅r⋅πDn60Q=3600 \cdot \mu \cdot H_0 L \cdot r \cdot \frac{\pi D n}{60}Q=3600⋅μ⋅H0L⋅r⋅60πDn
, where
μ=0.27\mu=0.27μ=0.27
。
Motor power
2×55kW is required for an hourly output of 100 tons.
Empirical formula:
ND=0.85⋅V⋅LN_D=0.85 \cdot V \cdot LND=0.85⋅V⋅L
（kW）。
Applicable material hardness
≤160MPa (such as coal, coke, limestone)
For ultra-hard materials, a cone crusher should be selected.
5. Maintenance and Selection Recommendations
1. Maintenance Focus
Roll Surface Repair: Inspect for wear monthly; repair local pits with wear-resistant welding rods; replace tooth sleeves every 3–5 years.
Overload Protection Testing: Regularly calibrate spring preload or hydraulic systems to ensure automatic reset after foreign objects pass through.
Lubrication Management: Lubricate bearings with lithium-based grease every 200 hours; regularly check oil levels in hydraulic couplers.
2. Selection Guidelines
Coal/Coke: Select wolf tooth rollers (enhanced shear force).
High-Moisture Materials: Equip with side scrapers + comb plates to prevent sticking.
Large-Scale Projects: Prioritize hydraulic adjustment + intelligent control systems (e.g., PLC automatic roll gap compensation).
Summary
The double-tooth roller coal crusher offers core advantages such as precise particle size control, low over-crushing, and energy efficiency, making it the preferred equipment for coarse/medium crushing in the coal, coking, and construction materials industries. Selection should match material characteristics (hardness ≤ 160 MPa, particle size requirements) and production capacity (e.g., for over 200 tons per hour, select 2PG1500×1000), while reinforcing wear-resistant roll surfaces and intelligent monitoring configurations to enhance long-term operational efficiency.
Product parameter
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