Sandvik Mining and Construction Oy

Sandvik Mining and Construction Tools Ab

Jouni Koskinen

Olivier Bruandet

Ilmo Pyörny

Antti Pajunen

Risto Haataja

Timo Seppala

Timo SEPPÄLÄ

A hammer drill assembly is arranged for coupling to a drill string, wherein the drill bit is releasably attached to a driver sub via a retaining sleeve. The retaining sleeve includes a body that extends between a ring at its forward end and a plurality of tips at its rearward end. Also, methods of attaching and detaching a drill bit from the rest of the assembly are provided.

Drill bit assembly comprising an expandable retaining sleeve

The disclosure relates to a changing device, rock drilling unit and a method of changing drill rods in rock drilling. The changing device includes a first drill rod station for receiving a second drill rod and a second drill rod station for receiving a third drill rod. The second drill rod station may be moved to the first drill rod station and the first drill rod station may be moved to drilling axis by moving the whole changing device in a transverse direction relative to a feed beam.

Drill rod changer, rock drilling unit and method of changing drill rods

A support includes a support element for supporting a drilling tool used in rock drilling. The support element is inside a suction housing of a rock drilling unit at least during drilling. The support is located at a front end portion of a feed beam and is used to support the tool especially during the collaring phase of the drilling. A method of collaring is disclosed wherein the drilling tool is supported by the support.

Drilling tool support and method of collaring

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Tampere, Finland

Jouni Koskinen