초록 ▼

A feed beam for a rock drill comprises a box girder (13), a saddle (10) slidable along the box girder, and two power units (20,20a) inserted into the ends of the box girder. Each power unit comprises a pair of fixed pulleys (22,24) located outside the end of the box girder, an hydraulic jack (26) ca

A feed beam for a rock drill comprises a box girder (13), a saddle (10) slidable along the box girder, and two power units (20,20a) inserted into the ends of the box girder. Each power unit comprises a pair of fixed pulleys (22,24) located outside the end of the box girder, an hydraulic jack (26) carrying a pair of movable pulleys (28,30) within the box girder, and a cable coupled between the power unit and the saddle and passing over the four pulleys.

대표청구항 ▼

A feed beam for a rock drill comprising: an elongated generally tubular main body (13), elongate guide means (11) on said main body (13) and extending therealong, a saddle (10) which is adapted to carry a rock drill (12) and which is mounted on the main body (13) to be moveable along said guide mean

A feed beam for a rock drill comprising: an elongated generally tubular main body (13), elongate guide means (11) on said main body (13) and extending therealong, a saddle (10) which is adapted to carry a rock drill (12) and which is mounted on the main body (13) to be moveable along said guide means, a first power unit (20), means removably mounting said first power unit to one end of the main body, said first power unit extending into the generally tubular main body so that the generally tubular main body encloses at least a major portion of said first power unit, and a second power unit (20a), means removably mounting said second power unit to the other end of the main body, said second power unit extending into the generally tubular main body so that the generally tubular main body encloses at least a major portion of said second power unit, said first and second power units being substantially aligned and having a free space axially between them interior of the generally tubular main body, each of said first and second power units comprising a set of at least two fixed pulleys (22,24) at the respective end of said main body, a pressure fluid actuated jack (26), a set of at least two pulleys (28, 30) mounted within the generally tubular main body and operatively coupled to the jack (26) to be movable by the jack towards and away from the fixed pulleys (22, 24), a flexible member (16 and 18, respectively) passing over said fixed and movable pulleys, one end of the flexible member being immovably affixed to said respective power unit and the other end being attached to the saddle such that the flexible member of each power unit pulls the saddle along the feed beam when said jack expands, said first and second power units being arranged to pull the saddle in relative opposite directions, and means coupled to said power units and arranged to abut against the respective end of the main body (13) to transmit the reaction forces from the respective power units to the main body.