| 摘要 |
PURPOSE:To ensure a highly efficient test for a sample piece ring of a steel pipe, by holding said piece ring at a certain position on the contrary to a conentional tester and pushing a spindle into the piece ring to expand and break the steel pipe. CONSTITUTION:A rod 6 is pressed into a sample piece ring 2 put on a pawl 10 by a descent of a press device. In this case, the downward conical circumference of the rod 6 abuts on the pawl 10 at an opening part, and the two sides forming an acute angle at the tip of each pawl slides mutually to press and open the pawl 10 outward. At the same time, the rod 6 turns with the ring 2 and in the same direction of the ring 2 via a thrust ball bearing provided to a long bearing at the basement of the rod 6 and synchronously with the rotary shift of the ring 2 which is caused by the expansion of the pawl 10. The ring 2 is held until it is expanded and broken. In such way, the rings 2 are consecutively supplied to a supporting part to perform a highly efficient test for expansion of a steel pipe. |
