FIELD: mining industry.
SUBSTANCE: drilling crown has cylindrical body, armored by hard-alloy plate with to wedge blades in central portion and spherical shelves on its peripheral portions. Hard-alloy plate is provided with additional wedge blade, center of each of which is placed on straight line, connecting centers of spherical shelves, and at distance same from crown axis, equal to half of length of portion of this axis to one of spherical shelves. Projections of blades on horizontal surface of plate are directed at angle less than 90° to straight line and oppositely to each other.
EFFECT: higher productiveness.
3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
RU2312200C1 |
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RU2552278C2 |
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|
SU607972A1 |
