| 摘要 |
PURPOSE: A bit guiding device for centering tap hole is provided to guide the bit so that hole opening operation is carried out at the center of the tap hole by preventing one shot bit from digging the tap hole with being deviated from the center of the tap hole during centering thereof when preparing operation for tap hole opening. CONSTITUTION: The bit guiding device for centering tap hole includes a center arm fixed to hacker of tap hole opener; a link support(11) fixed to both sides of length of the center arm and extended downward; a shaker guide(12) fixed to the lower part of the link support(11); a shaking link(9) inserted into the shaker guide(12) and ascended or descended along the shaker guide(12); a hydraulic cylinder(10) which is connected to a point to which an operating support(8) extended toward the rear side from the upper part of the shaking link(9) and the upper part of the link support(11) is rotationally connected, and which is fixed onto the hacker; a shaker(16) fixed to the lower part of the shaking link(9) by penetrating the lower part of the shaker guide(12); a guide tip(13) comprising a guiding hole(14) fixed to the lower part of the shaker(16) and contacted with the surface of the tap hole to guide one shot bit; and a return spring(15) connected to the rear surface of the lower side of the link support(11) and fixed onto the hacker.
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