Patent Number: 6,192,728

Title: Pipe bending machine accurately controlling bent angles of pipes

Abstract: A pipe bending machine accurately controlling bent angle of material pipes includes a base, a material feeding device fixed on the base, an arm-turning shaft fixed in front of the base, a bending mold fixed on the arm-turning shaft, a turning arm rotated by a transmitting device. The turning arm has a clamp mold fixed thereon for clamping a material pipe with help of the bending mold. The transmitting device includes a threaded rod rotated by a motor, a threaded nut screwing with the threaded rod and connected with a pull block, and an interactive device positioned between the pull block and arm-turning shaft. Rotation force of the motor is converted into straight pushing force by means of the threaded rod and the threaded nut. At this time, counter pressure of the ball threaded rod can easily reach zero, so even if a speed reducer of high counter-pressure is provided, the threaded rod can reduce largely the counter-pressure of the speed reducer because of the counter-pressure produced before the threaded rod changes speed. Then the pipe bending machine can accurately bends pipes with high speed.

Inventors: Hu; Ping-Kun (Tainan, TW)

Assignee: Yin Lin Machine Industrial Co., LTD

International Classification: B21D 7/00 (20060101); B21D 7/024 (20060101); B21D 7/02 (20060101); B21D 7/14 (20060101); B21D 007/04 (); B21D 009/05 ()

Expiration Date: 02/27/2018