Overview; Design And Function; Working Principle Of A Rock Drill; Control Valve Mechanism - Atlas Copco BBD 12 Sicherheits- Und Betriebsanleitung

BBD 12, 15

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 12 and BBD 15 are pneumatic rock drills
designed for vertical drilling, plug hole drilling and
drilling in concrete for construction and mining
applications. No other uses are permitted.
To choose correct insertion tools, contact your local
Atlas Copco dealer.

Working principle of a rock drill

Impact Feed force

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.
© 2010 Atlas Copco Construction Tools AB | No. 9800 0937 90 | 2010-01-01
Original instructions
Rotation

Flushing

Safety and operating instructions

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
Flushing is ducted through a hole in the piston. This
means that flushing air is provided as soon as the
compressed air is switched on.

Main parts

BBD 12T/TS
Return stroke
13