| 摘要 |
PROBLEM TO BE SOLVED: To provide a drawing-up device for a boring machine for molten metal tapping hole, in which a boring rod always forms the horizontal attitude at the stationary position regardless of the inclining degree of the boring rod adjusted to the boring position and the drawing-up device in the stationary position is surely held. SOLUTION: The piston rod 11 of a drawing-up cylinder 10 has a joint 17 connected with a free end part of a bell crank 13 received so as to be swingable while centering a shaft 16 fixedly arranged to a drawing-up frame 8 between the piston rod 11 and the bell crank 13. Then, the free end part of the bell crank 13 is connected with a short lever arm 15 at the upper side of the two drawing-up arms 6 through a coupler 14 so to be freely rotatable. The drawing-up arms 6 are received so as to be swingable while centering a shaft 20 fixed to a drawing-up frame 8 and at this time, the coupling 14 forms the short lever arm 15 of the drawing-up arms 6 at the stationary position and a self-enclosing knee joint 18. |
