Oy Tampella Ab

Sandvik Tamrock Oy

Unto Ahtola

Jaakko Kuusento

Arne Lislerud

A method and a rock drilling apparatus for drilling holes in rock according to a predetermined drilling plan. The method comprises measuring the location of each hole in the rock by inserting a measuring device into the hole, and calculating the deviation of the end of the measured hole from the location determined in the drilling plan. The rock drilling apparatus comprises a measuring device that can be inserted into a drill hole, and means for transferring the measurement values measured by the measuring device to control means of the rock drilling apparatus.

Method and rock drilling apparatus for controlling rock drilling

Pressure fluid operated percussion drilling machine comprising a frame (1) forming a cylinder space (2) for an axially movable percussion piston (3). The frame is provided with channels (4,7) connectable to a pressure fluid source (5) and to a pressure fluid container (8) respectively for pressurizing the cylinder space alternately on each side of the percussion piston in order to move it back and forth. The frame is also provided with means (12) for connection of a drilling rod (13) to the frame for directing strokes on the drilling rod by means of the percussion piston. A pressure fluid operated rotation mechanism (18) is mounted on the frame for rotating the drilling rod, which mechanism is connected to said channels for rotating the mechanism by means of a pressure fluid. The frame is provided with two outlet channels (7,19) terminating in the cylinder space at a distance from each other in the direction of movement of the percussion piston. One of said outlet channels is connected to the rotation mechanism and the other to the pressure fluid container so that the percussion piston distributes the pressure fluid displaced out from the cylinder space in a desired proportion between the fluid container and the rotation mechanism.

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Tampere, Finland

Unto Ahtola