FIELD: mining.
SUBSTANCE: soil drilling device includes mast, drilling drive directed on the mast for the drive of drilling column and transfer mechanism located between drilling drive and drilling column in order to perform the transfer with transfer ratio. In order to invert the transfer ratio, transfer mechanism is located on the drilling drive with possibility of being detached and installed in inverted position.
EFFECT: possibility of adaptation of rotation speed of drilling column at maximum possible simple design and its minimum need for maintenance.
10 cl, 5 dwg
