FIELD: mining.
SUBSTANCE: drill crown comprises a housing containing a ball vibrator with inlet and outlet channels and a locking device equipped with a spring-loaded valve located in its cavity. The locking device is located on the side of the vibrator inlet channel. The valve is made in the form of a hollow cylindrical spring-loaded piston with a radial channel, combined in the working position with the vibrator inlet channel.
EFFECT: increase of drill crown performance.
2 dwg
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