Sandvik Mining and Construction Oy

Timo Leino

Timo Muuttonen

Antti Koskimäki

Ari Kotala

Juha Piispanen

Sirpa Launis

Antti Koskimaki

A rock drilling machine, rock drilling rig and method of measuring physical features during rock drilling is provided. The rock drilling machine includes one or more sensing devices, which are arranged in connection with a bendable sensing cord. The sensing cord is fed via a feed passage to a flushing passage of a drilling tool.

Rock drilling machine, rock drilling rig and measuring method

A control valve for controlling flow of a pressure fluid in a breaking device includes a sleeve-like control valve having at least one opening enabling flow of the pressure fluid through the opening. The at least one opening includes at least one wall, at least a part of which is not arranged in a direction parallel to a radial direction of the control valve extending through the middle point of the cross section of the opening on the outer circumference of the control valve, such that the pressure fluid flowing through the opening may be arranged to rotate the control valve about the longitudinal axis of the control valve.

Control valve

A percussion piston for a rock drill machine having a pilot cylinder, a distributor and a pressure medium includes a control edge configurable to cause a change in the position of the distributor in a direction parallel to the axial direction of the percussion piston as the percussion piston moves in the impact direction (A) in relation to the pilot cylinder. The control edge of the percussion piston includes at least one notch provided on the outer periphery of the control edge and arranged to cause a start of a state change for the distributor before the control edge of the percussion piston passes by a corresponding control edge provided on the distributor or pilot cylinder.

Growing community of inventors

Tampere, Finland

Timo Leino