| 摘要 |
<p>A shear head for removing weld upset from butt-welded rail before the latter is removed from the butt-welding machine, comprises a horseshoe-shaped back plate which carries three cutting tools. An arm, which is pivotally mounted on one of the ends of the back plate and adapted to be latched to the other end to close the bight of the back plate, carries a fourth tool. The shear head is stored at a location remote from a weld gap of the machine during welding. After welding the shear head is lowered into the gap until its upper central tool abuts the top of the welded rail between the weld and the movable head, which causes the arm to be raised and latched to complete a continuous frame of cutting tools around the rail. The shear head is then driven across the weld by the movable head to remove weld upset.</p> |
