Búa phá đá Caterpillar lắp trên máy đào - P2
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Caterpillar Impact Products Ltd.
Caterpillar Hammers
World Hammer Market
Utilizes
Two Different
Power Concepts
Self Contained System
Accumulator Design
Piston - Gas System
Direct Acting
OR
Caterpillar Impact Products Ltd.
Caterpillar Hammers
H45 - H100
Hammer
Construction
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Function of the Hammer Components
.
Models:
H45 H50
H63 H70
H90C H100
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Front Head
Transfers forces from tool
into side plates.
Supports tool guidance system.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Tool Bushings
Align tool with the piston.
Provide contact surfaces
with tool.
Field replaceable for
better serviceability.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Tool Retainer Pin
P
revents tool from falling out.
Absorbs partial impact
loads of idle strokes.
Transfers impact loads to
front head on idle strokes.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Thrust Ring
Positions tool for correct
contact with piston.
Absorbs shock loads from
tool.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Tie Rod Assembly
Holds assembly together.
Absorbs partial impact loads
from idle strokes.
Assembled as a matched pair.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Piston
Transfers hydraulic power
into a shock wave
transmitted thru the tool.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Distributor Valve
Directs oil flow for piston
movement.
Connects top of piston to
tank on upward stroke.
Connects top of piston
to inlet pressure on
downward stroke.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Pressure Adjusting Valve - PAV
Supplies oil to the low
pressure circuit on start-up.
Assures a constant force
in the Low pressure circuit.
Functions like a pressure
reducing valve.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Accumulators
LP accumulator (top)
Stores energy for the impact
stroke.
Transmits energy thru the low
pressure circuit to the piston
.
HP accumulator (back)
Dampens pulsation in pressure
line.
Prevents internal cavation
.
LP
HP
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Accumulator Nitrogen (N
2
) pre charge
Positions membrane for proper operation
Low pressure - pre charge
Controls energy output
and working oil volume
High pressure - pre charge
Minimizes effects of pulsation
on hydraulic system
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Two Different Power Concepts
Caterpillar
Indeco
Tramac
Krupp - Allied
Furukawa - Kent
NPK
Toku - Teledyne
Soosan - Stanley
Accumulator
Design
Direct Acting
Design
“Oil-fired”
“Gas-fired”
Caterpillar Impact Products Ltd.
Caterpillar Hammers
Reliability Factors
Leakage points
Nitrogen
Direct Acting Design
Accumulator Design
Nitrogen
oil
Reliable & Consistent Power
*Ref: NPK Service Manual 98.2.500 Page 16
“A small amount of oil leakage
between tool and tool bushing
is considered normal” *
Lower and upper seals are identical.
Caterpillar Impact Products Ltd.
Caterpillar Hammers
N
2
Nitrogen
0
1000 hrs.
N
2
psi
Hammer
productivity
250
0
N
2
psi
0 600 hr.
580
250
0
580
Accumulator Design Direct Acting Design
Productivity: Consistent Productivity: Variable
Recharging required
at 100 hour interval
Hammer
productivity
1 2 3 4 5 6
Frequency of Recharge
Ref: NPK Service Manual
98.2.500 Page 19.
Self Contained
