Trompil marking device

The utility model belongs to the technical field of machining and specifically relates to relate to a trompil marking device. The positioned tapping tool comprises a base. A lead screw, the lead screw is fixed set up in on the base. A swinging boom, the swinging boom links together through connecting portion no. 1 and lead screw, just the swinging boom is perpendicular the lead screw sets up to the highly stable of swinging boom, swinging boom wire winding pole keep when rotating. A scriber, the scriber pass through connecting portion no. 2 with swivel arm is in the same place, just the scriber is perpendicular the swinging boom. Can can come the surface overbar at the pipeline through the length of continuous adjustment scriber according to the change of the surface of pipeline section like this when ruling. It is wide to have the range of application, and the structure is light simple, advantages such as easy operation.