Method of generating stress pulse in tool by means of pressure fluid operated impact device, and impact device
AssigneeSandvik Mining and Construction Oy
InventorsMarkku Keskiniva, Jorma Mäki, Mauri Esko, Erkki Ahola, Aimo Helin, Timo Muuttonen
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Abstract
A method of generating a stress pulse, and an impact device. In the method, pressure fluid is fed as pressure pulses to a working chamber residing between the frame of the impact device and a tool such that the resulting force presses the tool towards the material to be processed. The impact device comprises a working chamber and device for conveying pressure fluid as pressure pulses thereto such that a force is produced between the frame of the impact device and a tool to press the tool towards the material to be processed.
Claims32
A method of generating a stress pulse in a tool by means of a pressure fluid operated impact device, a rock drill or a braker, comprising:
- arranging the tool to be in contact with the material to be struck in order to produce an impact in the material to be processed;
- feeding pressure fluid to the impact device and discharging the pressure fluid therefrom in order to use the impact device;
- feeding pressure fluid as pressure pulses to a working chamber residing in the impact device between a frame of the impact device and the tool such that the pressure of the pressure fluid produces a force between the frame of the impact device and the tool, the force pressing the tool towards the material to be processed such that due to the influence of the force;
- and
- generating a stress pulse in the tool in its longitudinal direction such that the stress pulse propagates through the tool to the material to be processed, the generation of the stress pulse ending substantially at the same time as the influence of the force on the tool ends.
A pressure fluid operated impact device, a rock drill or a braker, comprising:
- a frame whereto a tool is mountable movably in its longitudinal direction, the tool, during an impact, being arranged to be in contact with the material to be struck;
- means for feeding pressure fluid to the impact device and discharging pressure fluid therefrom in order to use the impact device;
- wherein the impact device comprises a working chamber and means for conveying pressure fluid as pressure pulses to the working chamber such that the pressure of the pressure fluid produces a force between the frame of the impact device and the tool, the force pressing the tool towards the material to be processed such that due to the influence of the force, a stress pulse is generated in the tool in its longitudinal direction such that the stress pulse propagates through the tool to the material to be processed, the generation of the stress pulse ending substantially at the same time as the influence of the force on the tool ends.
Dependencies are inferred from the claim text.