Atlas Copco Rock Drills Ab

Uniroc Ab

Atlas Copco Rocktech Ab

Jörgen Rodert

Kurt Andersson

Peter Birath

An arrangement intended to be part of a rock drilling machine for percussive drilling. The arrangement includes a casing part with at least one plane end plane. The end plane includes at least a first region and a second region. The first region includes at least a part of the outer contour of the end plane and includes of a material that resists corrosion.

Device and method for protecting the rock drilling machine from corrosion

The invention relates to an arrangement designed to be inserted in a cavity () in a front part () of a rock drilling machine with a shank adapter (). The arrangement comprises a cartridge () with a flushing head () and a guide () coaxially arranged to create a longitudinal channel () designed as a passage for the shank adapter ().

Arrangement and method comprising a flushing head for a rock drilling machine, and rock drilling machine comprising the arrangement

A percussion device has a machine housing (), a forwards and backwards movable percussion piston () in the machine housing, and a reciprocatingly movable valve body () in the machine housing. The percussion piston has a first () and a second () driving surface subjected to pressure to drive the percussion piston () forwards and backwards. The valve body () has a first end surface () and a second end surface () for driving the valve body in first and second directions by applied pressure. The valve body () is arranged over a channel () in the machine housing, to connect at least the second () driving surface alternately to a pressure source () or to low pressure (), and the second end surface () is alternately connectable by the percussion piston () to the pressure source () or, over a valve device () for creating a counter-pressure, to the low pressure ().

Percussion device

A rock drilling machine includes a sleeve having openings surrounding a portion of a lubrication channel. A groove surrounds the sleeve, and one end of a second channel is connected to the groove. The other end of the second channel is connected to a lubrication point so that lubricant from the lubrication channel is distributed from the lubrication channel, through the sleeve and groove to the second channel, and from the second channel to a lubrication point of the rock drilling machine.

Rock drilling device

Percussion device including a machine housing (), a forwards and backwards movable percussion piston () in the machine housing, and a reciprocatingly movable tubular valve body () inside the machine housing, said percussion piston () being arranged to subject a tool () to impact, and said percussion piston including a first () and a second () driving surface arranged to be pressurized in order to drive the percussion piston forwards and backwards, said valve body () including a first end surface () and a second end surface (), wherein pressurizing the first end surface () tends to drive the valve body in a first direction and pressurizing the second end surface () tends to drive the valve body in a second direction, whereby the valve body () is arranged, over a channel () arranged in the machine housing, to connect at least the second () of the driving surfaces alternately to a pressure source () or to low pressure (), wherein an inner room () in the tubular valve body () is continuously connected to the low pressure () over at least one-opening () through an envelope surface of the valve body ().

A rock drilling machine has a housing (), a hammer piston () movable to-and-fro in the housing, a drilling tool (), and a guide () for the drilling tool. The guide () consists at the surface against the drilling tool () of polyethyleneterephthalate.

Rock drilling machine

Rock drilling device comprising a backhammer unit (10) in which a hammer piston (9) is movable to-and-fro for automatically exposing a tube string (4) to impacts in a direction away from a drill bit (8) in the tube string. The backhammer unit comprises a housing (13) and a springloaded tube part (14). The housing and the tube part form between them a first valve (16) and a second valve (17). At drilling the first valve which controls the supply of driving medium to said hammer piston is closed and the second valve which controls the flushing medium flow is open. At backwards feeding of the rock drilling machine (2) along the feed beam (1) with a force which exceeds a predetermined value the first valve is open and the second valve is closed.

Rock drilling device comprising a drilling tool with a set of tubes (7) and a set of rods (9) arranged therein. The drilling tool comprises a number of sections which each comprises a tube (7), a rod (9) and an end piece (11). The rod is provided with projections (10) at least near one of its ends for cooperation with parts (13,14) with reduced diameter in the tube and end piece respectively. The part (13) in the tube limits the movement of the rod in a direction away from the end piece. The part (14) in the end piece limits the movement of the rod in a direction towards the end piece. All thread connections (12) between different sections of the drilling tool and between tube and end piece within each section are made in the same way and thus equally easy to break.

Device in hammer machines. The device comprises a machine housing (1) and a hammer piston (2) movable to-and-fro in the machine housing. A drilling tool connected to the machine housing comprises a drill bit (5), a set of tubes (4) for rotating the drill bit and a set of rods (3) for transferring impact energy to the drill bit. A rod (11) situated adjacent to the drill bit is provided with an axial channel (7) and a radial channel (8) for supplying flushing medium to the flushing channel (6) of the drill bit. The distance (S) from the front end (9) of the drill bit to channel (8) is larger than the length (L) of the hammer piston (2).

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Saltsjö-Boo, Sweden

Jörgen Rodert