公开(公告)号：EP2569109A1

公开(公告)日：2013-03-20

申请号：EP11781120.8

申请日：2011-05-10

申请人： CRC-Evans Pipeline International, Inc.

发明人： SCOVILLE, Jeffrey, C. ,  GWARTNEY, Timothy, R. ,  SEARS, Stephen

IPC分类号： B21D7/022

CPC分类号： B21D7/00 ,  B21D7/022 ,  B21D7/0225 ,  B21D7/06

摘要： A pipe bending machine has a stiff-back which is driven by a pivoting wedge. A linkage applies force from the actuator to the wedge in a direction parallel to a longitudinal axis of the stiff-back. The stiff-back pivots on a first fulcrum and the wedge slides on a bed which pivots on a second fulcrum. The actuator drives the wedge between the stiff-back and the bed to rotate the stiff-back at the first fulcrum and bend the pipe seated in the stiff-back against the pipe bending face of a die. The conversion of the longitudinal force applied to the wedge into a transverse force applied to the stiff-back provides a significant mechanical advantage which varies directionally as the stiff-back rotates about its fulcrum to maintain a constant force on the stiff-back.