The Research and Realization of the Ultra-low and Constant Speed Control Technology About the Cylinder for the Large Caliber Pipe Bender

The ultra-low and constant speed control is one of the key techniques that the large caliber pipe bender can use to achieve bend automatic process. This technology which could analyze the working requirements of the pipe bender´s heating, introduces the single-cylinder pulling and bending driving form and uses the hydraulic control technique to realize the stationary and reliability in the cylinder´s ultra-low speed motion. Additionally, it will prevent the phenomenon of vibration and arc ridging in the process of thin-wall pipe´s bending and assures a high quality of large bend caliber pipes with different bending radiuses and bending angles. At the same time, this technology could also be promoted and applied in any hydraulic controlled devices which need a stable and low-speeding operation.