| 摘要 |
FIELD: mining.SUBSTANCE: drill tool comprises a housing with channels for cleaning agent reinforced with hollow hard-alloy inserts, the cavities of which are interconnected with the housing channels. Each hard-alloy insert is fitted with a guiding element for cleaning agent designed with the screw shape placed in the insert cavity and fixed in it from crank.EFFECT: improvement of overall performance of the tool.4 cl, 3 dwg |
