Sandvik Mining and Construction Oy

Timo Kela

Esa Laakkola

Timo Muuttonen

Antti Koskimäki

Mikko Hamalainen

Jussi Peurala

Lars Kandelin

Jarno Viitaniemi

Matti Viinikka

Martti Leskinen

Pertti Parkkinen

Mikko Hämäläinen

Juha Polonen

Jarkko Niemi

Teemu Hietakari

Jari Kiili

Ville Kohola

Perttu Koivumaki

Antti Koskimaki

Perttu KOIVUMÄKI

Juha PÖLÖNEN

Esa LÄÄKKÖLÄ

An arrangement and method for heating an impact device of a rock treating machine (Rtm) in low-temperature operating conditions is provided. The arrangement includes a warm-up mode (WM) for feeding pre-heated hydraulic fluid through a feed channel to a hydraulic circuit of the impact device. One or more hydraulic accumulators are provided in the hydraulic circuit. The feed channel is provided with a control element for limiting the feeding of the pre-heated hydraulic fluid during the warm-up mode. The control element limits the feeding of the pre-heated hydraulic fluid in the feed channel so that separating elements of the pressure accumulators do not move.

Arrangement and method for heating hydraulic impact device

A hydraulic system, rock drilling rig, and method for limiting output performance of a hydraulic drilling actuator temporarily under execution of a safety function feature of a hydraulic system is provided. The output performance is limited by limiting produced hydraulic fluid flow in a hydraulic circuit of the hydraulic drilling actuator, whereby a restricted magnitude of the fluid flow is produced at a hydraulic pump. This way a restricted operation mode is enabled and is controlled by a control unit.

Valve cylinder, impact device and method

A shank adapter, rock drilling machine and method of mounting a shank adapter of a rock drilling machine inside a slide bearing element. The shank adapter includes a coupling head and a rotation portion at its opposite ends, and a flushing portion located therebetween. Outer diameters of the coupling head and the rotation portion are both greater than outer diameters of portions of the shank adaptor located therebetween.

Shank adapter, rock drilling machine and method

A piston guiding element, rock drilling machine and method for supporting a front end portion of a percussion piston of a rock drilling machine. The piston guiding element includes a braking recess at its rear end. The element further includes at least one bearing sleeve, which is provided with two axially successive slide bearing sections. Hydraulic fluid is conveyed between the slide bearing sections via a feed system.

Piston guiding element, rock drilling machine and method

A flushing element, rock drilling machine and method of providing a flushing space around a shank adapter of a rock drilling machine. The flushing element surrounds the shank adapter passing through it. The flushing element has a feed opening for feeding flushing agent to the flushing space and at least two sealing housings for flushing sealings and wherein the flushing sealings are on opposite axial sides of the flushing space. Furthermore, the flushing element has split configuration whereby it is mountable and demountable in radial direction.

Flushing element, rock drilling machine and method

The present disclosure relates to a blind nut, a fastening arrangement and further to a method of fastening. The blind nut includes a cylindrical outer surface portion provided with one or more sealing elements. The sealing elements of the blind nut may seal against a cylindrical inner surface of a nut space inside which the blind nut is configured to penetrate when being tightened.

Blind nut, fastening arrangement and method of fastening

A breaking device includes a frame, an impact device having a pressure chamber with a rear pressure chamber and a front pressure chamber. The breaking device further includes a first low pressure port at the rear pressure chamber, a first low pressure channel and a first low pressure accumulator connected to the first low pressure channel. The breaking device further includes a second low pressure port at the rear pressure chamber substantially opposite to the first low pressure port, second low pressure channel and a second low pressure accumulator connected to the second low pressure channel. The first low pressure accumulator and the second low pressure accumulator are arranged at the outer circumference of the frame of the breaking device at different positions in the axial direction of the breaking device.

Breaking device

Growing community of inventors

Tampere, Finland

Timo Kela