| 摘要 |
The present invention relates to a bolt fastening device, and more specifically, to a bolt fastening device of a liner for a manhole for automatically fastening a plurality of bolts to the liner which is a component of the manhole used in a vessel. Since fastening force of the bolt is fastened by a clutch at regular forces, the bolt can be fastened with the desired depth and power. By making that power opposite to the fastening direction of the bolt isn′t strongly affected by the clutch even when returning the original condition after fastening the bolt, defection can be prevented. By forming one or more springs on the inside of a body, absorbing impact in which a socket is crushed into the pre-assembled bolt, and not giving direct impact in power transfer composition, durability can be significantly improved. |
