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1. (WO2018101870) METHOD, APPARATUS AND HOLDER FOR MOUNTING OF A DRILL BIT

Pub. No.:    WO/2018/101870    International Application No.:    PCT/SE2017/051073
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Wed Nov 01 00:59:59 CET 2017
IPC: E21B 19/18
E21B 19/14
Applicants: EPIROC ROCK DRILLS AKTIEBOLAG
Inventors: ENGBLOM, Johan
Title: METHOD, APPARATUS AND HOLDER FOR MOUNTING OF A DRILL BIT
Abstract:
Herein a method (100), a device (21) and a holder (17) for rock drilling is described. The method (100) comprises the steps of: aligning (101 ) a drill rod (3) arranged at a first drilling unit (11) by using a first arm (9) towards a drill bit (1) placed in a fixedly arranged holder (17) adapted to hold at least two drill bits so that the axis of rotation of the drill rod (Ab) substantially coincides with an axis of rotation (Ak) of the drill bit (1), wherein a free movement of the first drilling unit (11) in relation to the holder (17) is permitted, to displace (103) the drill bit (3) axially forward towards the drill bit (1) to a first position of the drill bit (3) permitting mounting of the drill bit (1), mounting (105) the drill bit (1) on the drill rod (3) and displacing (107) the drill rod (3) axially backward to a second position in which the drill bit (1) has been removed from the holder (17).