1. Product Introduction
The double roller crusher is an ultra-heavy-duty sizing machine
specifically engineered to dominate the extreme hardness and
intense abrasiveness characteristic of natural basalt. Its core
function involves utilizing two parallel, counter-rotating rollers
to apply massive, synchronized compressive forces to materials fed
into the crushing chamber. Basalt is an igneous volcanic rock with
a dense crystalline structure, often exceeding a compressive
strength of 250 MPa, which causes devastating wear and rapid liner
degradation in traditional impact or cone crushers. Built with
reinforced structural steel frames, heavy-duty independent
drivetrains, and elite wear-resistant metallurgy, this machine acts
as a highly reliable secondary or tertiary crusher designed to
shatter tough basalt into premium, high-specification aggregates
and manufactured sand.
2. Application
Double roller crushers are widely used in high-load highway asphalt
production, high-speed railway ballast quarries, airport runway
construction, and concrete aggregate plants. Specific materials
processed include dense basalt, diabase, gabbro, and ultra-hard
volcanic rocks. The process stages encompass secondary reduction
for base courses, tertiary aggregate shaping, and fine sand
manufacturing. Additionally, specialized configurations address
distinct operational challenges. For instance, high-pressure
studded roller models are primarily deployed in Manufactured Sand
(M-Sand) circuits to process basalt fines and pea gravel into
sharp, high-adhesion concrete sand. Segmented ribbed or grooved
roller profiles, meanwhile, are utilized in coarser sizing stages
to aggressively grip the dense rock, maximizing throughput while
minimizing frictional sliding and heat generation.
3. Working Principle
The fundamental operating principle of a double roller crusher in
basalt processing circuits involves feeding pre-crushed volcanic
rock into the crushing zone from above, where it is immediately
caught by the synchronized counter-rotation of the dual rollers. As
the dense basalt is drawn downward into the narrowing clearance
gap, it is subjected to continuous, extreme surface-to-surface
mechanical compression. This immense force fractures the rigid rock
matrix cleanly along its natural internal crystalline boundaries
rather than shattering it blindly. The crushed, highly angular
material falls through the discharge gap at the bottom by gravity.
The final product size is strictly controlled by the adjustable
clearance between the two roller faces, ensuring an ultra-uniform
output with an exceptionally low percentage of unmarketable dust.
4. Advantages
High-efficiency separation and broad applicability: Effectively
processes exceptionally tough, abrasive basalt with a high
reduction ratio and optimal grain shape. Its slow-speed compression
mechanism eliminates impact shattering, yielding a near 100%
cubical aggregate with zero flakiness, perfectly meeting strict
civil engineering standards for heavy-traffic asphalt layers.
Robust and Flexible Processing Capacity: Equipment specifications
offer a comprehensive range of roller diameters, widths, and
hydraulic pressures, allowing the machine to seamlessly scale from
low-tonnage specialized aggregate lines to high-capacity,
continuous large-scale basalt quarrying operations. Low Energy
Consumption and Stable Operation: The direct compression action
avoids the massive kinetic and frictional energy losses typical of
high-speed impactors or vertical shaft impactors (VSIs). Power
consumption per ton is drastically minimized, and the rugged
drivetrain guarantees reliable 24-hour continuous operation under
punishing full-load conditions. Convenient Operation and
Maintenance: Designed with premium tungsten carbide studded roller
shells or interchangeable segmented high-chromium alloy liners. The
studded texture allows fine basalt matrix to pack between the studs
during operation, creating a natural rock-on-rock protective layer
that drastically extends liner wear life and slashes total
operating costs. High Intelligence and Automation: Integrated with
advanced PLC automation, the system provides real-time online
monitoring of hydraulic system pressure, bearing temperatures, and
roller shell wear states. Automated gap adjustments can be executed
remotely, allowing operators to rapidly change product size
configurations from coarse railway ballast to fine manufactured
sand within minutes. Optimized structural design: Equipped with an
instantaneous hydraulic safety release system backed by nitrogen
accumulators. If an uncrushable foreign object—such as a broken
excavator tooth or drill steel from the basalt quarry—enters the
chamber, the movable roller automatically retracts in milliseconds
to let it pass safely, resetting immediately without disrupting the
continuous plant feed.
