Sandvik Mining and Construction Oy

Sandvik Intellectual Property Ab

Sandvik Tamrock Oy

Esa Rantala

Markku Keskiniva

Timo Muuttonen

Antti Koskimäki

Erkki Ahola

Juha Piipponen

Jorma Mäki

Vesa Uitto

Jarmo Heinonen

Ari Kotala

Timo Kemppainen

Sirpa Launis

Jaakko Niemi

Pauli Lemmetty

Heikki Saha

Vesa Peltonen

Pekka Saukko

Tapani Pöysti

Stephen Connelly

Teemu Majander

Anssi Hyvarinen

Risto Kallinen

Kimmo Eronen

Paul Brown

Anssi Hyvärinen

A feed beam, a rock drilling unit and to a method of manufacturing a feed beam is provided. The feed beam includes a basic profile element, which has two or more superimposed material layers. At least one of the material layers may be made of a composite material.

Feed beam and method of manufacturing the same

A rock drill includes a frame, a percussion member, an axial shank, and an axial sleeve provided within the frame and including a first pressure surface provided in a first pressure space and a second pressure surface provided in a second pressure space. A first channel is provided in the axial sleeve for providing a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame. A second pressure channel connected to the second pressure space is connectable to external pressure. A pressure accumulator is connected to the first pressure space and the flow of the pressure medium outwards from the first pressure space is throttled.

Rock drill

The invention relates to a percussion device comprising two percussion pistons alternately making a percussion motion and a control valve for controlling the percussion pistons. The control valve () comprises a slide () affected by a force so that the slide is generally in a first position, but moves at the end of the percussion motion of the first percussion piston from the first position to a second position and correspondingly back to the first position at the end of the percussion motion of the second percussion piston ().

Percussion device with a control valve for two alternately striking pistons

An axial bearing includes a first piston and a second piston. Axial contact surfaces between the pistons are arranged in the same pressure space. The same pressure fluid fed to the axial bearing acts on the contact surfaces and on working pressure surfaces of the pistons. A rock drilling machine is also provided with such an axial bearing.

Rock drilling machine and axial bearing

An impact device for a rock drill. The rock drill includes a tool and a mechanism for delivering a stress pulse to the tool. That mechanism includes an impact element supported to a frame of the drill, and a mechanism for subjecting the impact element to stress and thereafter releasing the impact element suddenly from the stress, whereupon stored stress energy in the impact element is discharged in the form of a stress pulse directed at the tool.

Impact device

A method and an equipment for controlling the operation of a rock drilling apparatus, which rock drilling apparatus comprises a percussion device for producing impact energy to a tool of the rock drilling apparatus, a rotating device for rotating the tool in a drill hole, a feeding device for feeding the tool in the drill hole and a flushing device for supplying flushing agent through the tool and the bit for flushing loose drilling waste from the hole. The feed force and the percussion power are determined and the relation between the feed force and the percussion power is adjusted to a targeted operation area within an upper and a lower limit.

Method and equipment for controlling operation of rock drilling apparatus

Growing community of inventors

Kyrönlahti, Finland

Esa Rantala