| 摘要 |
FIELD: mining.SUBSTANCE: blasting bulkhead consists of supporting beams and has a through ventilation hole that is equipped with a cover plate that is hinged to supporting beams with possibility of being turned about the hinge axis; besides, the cover plate is equipped with the following: a limit stop connected to supporting beams, a protective screen connected to lower plane of the cover plate, a funnel located along the perimetre of the ventilation hole, and a lifting mechanism located on lower plane of supporting beams.EFFECT: providing safe performance of works when drilling ascending workings, control of direction of the air flow of ventilation jet passing through the ventilation hole.4 cl, 3 dwg |
