Abstract
In the Coal Mining Reserch Centre, Japan, we developed five “Bolt Setters” for the purpose of preventing emergency and improving efficiency at Bolting works.First one has tracks and two hydraulic rotation moters for drilling and Bolting, which is operated by electric moter.Second one has a percussion drill which is installed on the simple wheel. It is operated by human power. Third one hastracks and hydraulic rotary percussion drill, which is operated by air motor (4kg/cm2 pressure).Fourth one has tracks and hydraulic rotary percussion drill, which is operated by electric moter.Last one has tracks, hydraulic rotary percussion or rotary drill and special mechanism which is able to choice rotary or rotary percussion drilling methods. It is operated by air moter (4kg/cm2 pressure).
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