Overview; Design And Function; Working Principle Of A Rock Drill; Control Valve Mechanism - Atlas Copco BBD 94W Instrucciones De Seguridad Y De Funcionamiento

BBD 94W, 94WE, 94WS

Overview

To reduce the risk of serious injury or death to
yourself or others, read the Safety instructions
section found on the previous pages of this
manual before operating the machine.

Design and function

Atlas Copco BBD 94 rock drill is water-flushed and
intended for air pressures of 4–6 bar. The rock drill
has been assigned for the following operations:
Atlas Copco pusher leg rock drills BBD 94 is used in
many construction and mining under-ground
applications. It is a high performance rock drill
suitable for soft to hard rock formations. The short
stroke and high impact rate makes it ideal for soft
rock. Large piston diameter gives high efficiency
even at low air pressures. The rock drill has water
flushing and a ratchet wheel rotation mechanism.
The pusher leg support is for helping the operator to
lift and feed the rock drill during drilling operations.
Pusher leg control is placed on the pusher leg. The
machine is intended to be used together with the
ALF 72D, ALF 72D-1 and ALF 67/80D pusher legs.
The model BBD 94WS, which has a steel cylinder is
also intended to be used together with the pusher
leg BMK 91RS, which is made of steel.
The BBD 94 has a cylinder of aluminium alloy with
a replaceable cylinder liner of steel. Flushing is
ducted through two concentric tubes, the outer one
for air and the inner one for water. This means that
flushing air is provided as soon as the compressed
air is switched on. The purpose is to prevent water
from entering the percussion mechanism of the rock
drill.
The rock drills are equipped with a chuck bushing
for a 22x108 mm hexagonal shank. The machine is
equipped with a 25 mm (1") connection for air and a
12.5 mm (½") connection for water.
To choose correct insertion tools, contact your local
Atlas Copco dealer.

Working principle of a rock drill

Impact Feed force
© 2010 Atlas Copco Construction Tools AB | No. 9800 0760 71a | 2010-01-01
Original instructions
Rotation Flushing
Safety and operating instructions

Control valve mechanism

The valve directs the air alternately from one side to
the other of the piston so that it moves up and down.
The piston transmits the energy through the drill steel
to the bottom of the hole.

Rotation mechanism

Impact stroke Return stroke
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