IMPACT MILL
Secondary and Tertiary Crushing
Cyrille Aerl Saladaga
Johna Lou Alvarez
IMPACT MILL
● comminution is by impact rather than
compression
● sharp blows applied at high speed to
free-falling rock
● commonly used for the crushing of limestone,
coal, calcium carbide, quartz, dolomite, iron
pyrites, gypsum, and chemical raw materials
of medium hardness
APPLICATION USAGE
Aggregate Industry
Common materials crushed include cement
and concrete
Mining Industry
Size reduction of variety of materials
Brick and Clay Industry
Applications and materials for this industry
include ceramics, glass and more
APPLICATION USAGE
Energy Industry
Reduce the size of materials such as coal and
biomass
Industrial Application
Including waste products and plastic pieces
WORKING MECHANISM
The moving parts are
beaters, which transfer
some of their kinetic
energy to the ore particles
on contacting them.
WORKING MECHANISM
The
internal
stresses
created in the particles are
often large enough to
cause them to shatter.
These forces are increased
by causing the particles to
impact upon an anvil or
breaker plate.
WORKING MECHANISM
There is an important difference between the states
of materials crushed by pressure and by impact.
There are internal stresses in material broken by
pressure which can later cause cracking.
Impact causes immediate fracture with no residual
stresses.
WORKING MECHANISM
This stress-free condition is particularly valuable in
stone used for brick-making, building, and road
making, in which binding agents, such as bitumen,
are subsequently added to the surface.
IMPACT CRUSHERS
therefore, have a wider
use in the quarrying
industry than in the
metal-mining industry.
PARTS OF THE EQUIPMENT
Impact Plate
● bears the impacting force
generated
from
the
material striking
● currently
using
high
manganese
steel
and
other wear resistance
material
Adjusting Device
● an
overload
protection
device
for
the
whole
machine
● often hydraulic or nut
adjustment
Rotor
● mostly adopts the integral
cast steel structure and has
a large moment of inertia
● Strong, durable and easy to
put the plate hammer on
● can meet the needs of
crushing work
Box Body
● the inner wall of the body
is made of steel plate
● left and right sides of the
body are equipped with
small doors to facilitate
maintenance
and
replacement
of
wear-resistant parts
Hammer
● the shape of the hammer
is closely related to the
way of fastening and
working load
● generally made of high Cr
cast iron, high-Mn steel
and other wear-resisting
alloy steel
Driving Device
● adopts the mode of motor,
v-belt and crusher, which
can effectively improve
the
motor
starting
performance and make
the motor start and run
smoothly
₱250,000-₱2,000,000
Depending on what materials will be
crushed, processing capacity, machine
structure and type
ADVANTAGES
●
●
●
●
●
●
Trouble free crushing
Improved product shape
High yield and production efficiency
Lesser energy consumption
High crushing ratio
Consistent and predictable
aggregate products
DISADVANTAGES
● Vulnerable to wear and tear
● Limited in the hard material
crushing
RESOURCES
● https://www.sciencedirect.com/topics/engineering/impact-crusher
● https://www.stedman-machine.com/impact-crushers.html
● https://www.911metallurgist.com/blog/impact-crusher-working-pri
nciple
● https://static.bhs-sonthofen.com/BHS-Prospekt-PBPM-EN_092017
-web_12.pdf
● https://www.engineeringintro.com/all-about-construction-equipme
nts/impact-crushers/
● https://www.lydhcrusher.com/news/Impact-Crusher-Parts.html