Overview; Design And Function; Working Principle Of A Rock Drill; Control Valve Mechanism - Atlas Copco BBC 16W Prescriptions De Sécurité Et Instructions Pour L'opérateur

BBC 16W, 16WS, 34W, 34WS, 34WTH

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 BBC 16W/WS, BBC 34W/WS and BBC
34WTH pusher leg rock drills are water-flushed and
intended for air pressures of 4–6 bar. The pusher leg
rock drills have been designed for the following
operations:
BBC 16W/WS, BBC 34W/WS and BBC 34WTH are
used in many construction and underground mining
applications. They are allround pusher leg rock drills,
suitable for medium and hard rock formations. No
other use is permitted.
The pusher leg support helps the operator to lift and
feed the rock drill during the drilling operation. The
pusher leg control is located in the back head of the
rock drill.
The machines are intended to be used together with
pusher legs BMT 51, ALF 71, ALF 71-1, or ALF
67/80.
The pusher leg rock drills have water flushing and a
robust rifle bar rotation mechanism. The pusher leg
rock drills are equipped with a chuck bushing for a
22 mm x 108 mm, hexagon shank. The rock drills
are equipped with a 25 mm (1 in.) connection for air
and a 12.5 mm ( 1 ⁄ in.) connection for water.
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To choose correct insertion tools, contact your local
Atlas Copco dealer.

Working principle of a rock drill

Impact Feed force
© 2012 Atlas Copco Construction Tools AB | No. 9800 0627 71f | 2012-06-30
Original instructions
Rotation

Flushing

Safety and operating instructions

Control valve mechanism

BBC 16W/WS
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
rifle bar rotation. The rotation is anti-clockwise and
is applied on the return stroke of the piston.
Flushing
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.
BBC 34W/WS, BBC 34WTH
Return stroke
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