| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: ceiling has screen, inside of which in guides extending screen is mounted and hydro-jack for moving extending screen. Ceiling is provided with guiding beam rigidly fixed on screen and cylindrical groove, cut-in gear with possible movement along guiding beam and cylindrical guide positioned transversely to screen and also with possible removal from them. Cut-in gear has saw, mechanically connected to engine through reducer, on body of which ring fixing is rigidly mounted for cylindrical guide. ^ EFFECT: higher reliability. ^ 2 cl, 3 dwg |
