Overview; Design And Function; Working Principle Of A Rock Drill; Control Valve Mechanism - Atlas Copco BBD 94-DSI Prescriptions De Sécurité Et Instructions Pour L'opérateur

BBD 94-DSI

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

BBD 94 DSI rock drill is air-flushed and is intended
for air pressures of 4–6 bar. The rock drill is designed
for the following operations:
BBD 94 DSI is specially adapted for the Dimensional
Stone Industry (DSI) and is intended for rig-mounting.
No other use is permitted.
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. The large
piston diameter gives high efficiency even at low air
pressures. The rock drill has a ratchet wheel rotation
mechanism.
The rock drill is equipped with a chuck bushing for a
22 x 108 mm (⅞" x 4¼") hexagon shank, a 25 mm
(1") connection for air to the impact mechanism and
a 12.5 mm (½") connection for flushing air. The
flushing system can be converted from air to water

flushing.

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 0679 71 | 2010-03-29
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
The drill steel is turned slightly with each blow by the
ratchet wheel rotation. The rotation is anti-clockwise
and is applied on the return stroke of the piston.
Flushing
The flushing air is ducted through a tube which needs
to be separately supplied with flushing air from the
12.5 mm (½") air inlet nipple in the backhead. If
needed the flushing system can be converted to
water flushing. If converted, flushing will be ducted
through two concentric tubes, the outer one for air
and the inner one for water.
Return stroke
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