| 摘要 |
<p>PURPOSE:To improve rolling efficiency and to perform a stable and sure control by controlling the opening and closing of an outlet chuck and the speed of a roll at the timing of detecting a joint of pipe stock. CONSTITUTION:Pipe joint detectors 9, 10, 11 are respectively provided to the spaces between the advancing limit A of the moving limits (l) of a roll stand and the inlet of a chuck 5, between the retreating limit B and the outlet of a chuck 6, and to the back of chuck 6, and are connected to a control room respectively. When the arrival of the joint of pipe stock is detected by the detector 9, a speed reducing operation is performed to make a roll speed lower than a standard speed. Next, when the detector 10 detects the arrival of the joint, the releasing operation of chuck 6 is performed. Further, when the final detector 11 detects it, the roll speed is increased to return the speed to the original standard speed by closing the chuck 6 at that timing.</p> |
