| 摘要 |
<p>HEAVY DUTY MOBILE PIPE STRAIGHTENING MACHINE OF RELATIVELY LIGHT-WEIGHT CONSTRUCTION A mobile pipe straightening machine is of relatively light-weight construction for increased transportability and finds particular application for straightening drill pipe in the field. For minimizing the overall weight of the machine, a bed frame is provided in an elongate, trough-shaped, construction having first and second upstanding sides and a bottom member to define a bed space. At least one drive roll is swivelly supported within the bed space, and first and second idler rolls are movably coupled to the bed frame in spaced relationship with the one drive roll. Each idler roll is supported within a housing which in turn is supported within a dome-shaped support structure. A bushing having a key slot and a key for the key slot is disposed between the dome-shaped support structure and the housing. By keying the housing to the bushing and by providing a slot in the dome-shaped support structure, the bushing (and thus the housing and idler roll) can be rotated by control apparatus positioned laterally of the dome-shaped support structure rather than in a position overlying it, thereby reducing the height otherwise required. Other features include: (1) individual control of the upper idler rolls to allow roll straightening of hooked, upset ends of drill pipe; (2) gag press straightening using separate gag press mechanisms; and (3) an individually actuable inspection mechanism which allows the pipe to be elevated from the drive rolls and rolled for visual inspection while still in the passage.</p> |
