APPARATUS FOR PIERCING CENTER OF TAPPING HOLE

摘要

PURPOSE: An apparatus for piercing a tapping hole is provided to solve demerits such as difficult piercing of the center of the tapping hole, supporting of a tapping bar with a lever and dangers of gas poisoning, burn, bruise and fall, lateral piercing of the center of the tapping hole and unstable operation and shortening of the life cycle of the tapping hole by accurately and easily piercing the center of the tapping hole with a piercing rod and a bit using a hammer and a drill after moving the tapping bar to the tapping hole. CONSTITUTION: In an apparatus for piercing the center of a tapping hole mounted in a hole piercing machine, the apparatus for piercing the center of a tapping hole comprises a high strength piercing rod (90) which is not bended by being united with various pipes; a bit (80) which can smoothly dig as if it cuts refractory materials; a bushing (50) preventing trembling of the piercing rod and having less friction; a rotational arm (40) which is inserted, rotated and approached to the tapping hole and fixed; a case fixing the rotational arm and enabling fine centering; and a cylinder (70) operating the rotational arm.