PERCUSSION DEVICE OF ROCK BREAKING DEVICE AND METHOD FOR CONTROLLING PERCUSSION DEVICE

The invention relates to a percussion device of a rock breaking device, a method for controlling the percussion device and a rock drilling unit. The percussion device (11) comprises a percussion piston (33), the work cycle of which is controlled by means of a control valve (40, 77). During the movem...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SAUKKO, Pekka, MÄKI, Jorma, HIETAKARI, Teemu, KOSKIMÄKI, Antti, MUUTTONEN, Timo
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS HAND TOOLS MANIPULATORS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERCUSSIVE TOOLS PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS TRANSPORTING
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Beschreibung
Zusammenfassung:	The invention relates to a percussion device of a rock breaking device, a method for controlling the percussion device and a rock drilling unit. The percussion device (11) comprises a percussion piston (33), the work cycle of which is controlled by means of a control valve (40, 77). During the movement of the percussion piston, a pressure pulse is generated by closing a pressure connection (Y1, Y2) from at least one impulse space (44, 45) surrounding the percussion piston. The pressure pulse is used to change the position of the valve from one extreme position to an other. The impulse space is an annular space defined in a radial direction by the percussion piston and the frame (25).The frame is further provided with at least one impulse channel (58, 59) for transmitting a pressure pulse to the pressure surface of the control valve.