| 摘要 |
A method and device for positioning a power tong ( 2 ) at the pipe joint ( 14 ) of a pipe string ( 12 ), where, after the pipe joint ( 14 ) has been brought within the working area of the power tong ( 2 ), the power tong ( 2 ) must be displaced to a position that corresponds with that of the pipe joint ( 14 ), and where a camera ( 16 ) which may be displaced in parallel with the pipe ( 12 ), and which is linked to a display ( 18 ), is displaced until the image of the pipe joint ( 14 ) coincides with a marker ( 40 ) in the display, whereupon a signal is transmitted to a control ( 26 ), indicating that the power tong ( 2 ) is to be displaced to a position that corresponds with that of the camera ( 16 ) and thereby that of the pipe joint ( 14 ).
|
