The working principle of the hydraulic pipe bending machine is to make the steel pipe plastically deformed by the bending point of the fulcrum and the force point, so as to achieve the cold bending of the steel pipe. The lower die is located at the front of the pipe bending machine and is hung by the hydraulic cylinder. In the floating state on the frame, the steel pipe is introduced into the lower mold from the rear of the bending machine through the clamp and the upper mold by the spreader, and the inner tube is placed in the steel pipe and placed in the center of the upper mold, and the inner tube expansion block is used to hug the inner wall of the steel pipe. So that the steel pipe avoids abnormal deformation during bending.
In marine engineering, standard pipe fittings play an important role in pipeline engineering, but in some special occasions, non-standard pipe fittings are sometimes used. For example, the horizontal pipe of a submarine pipeline, the riser, and the inflection point of some process pipelines on the upper part of the platform, it is usually necessary to bend a large radius elbow to meet the special requirements of the submarine pipeline passing ball, and to reduce the energy loss of the fluid in the pipeline and Erosion of the pipeline.
Unlike the mechanical performance test, the non-destructive inspection of the double-head hydraulic pipe bending machine is a non-invasive inspection of the test object, including various detection methods. Non-destructive testing of elbows usually uses ultrasonic testing and magnetic particle testing. The temperature accuracy is high, and the temperature required for the bending process is a constant value. The accuracy of the measuring tool is very important. In the general enterprise, the portable infrared thermometer is selected for measurement, which cannot be used for real-time monitoring, and because of portable operation. When the human factors are not well controlled, it will bring unimaginable hidden dangers to the quality of the hydraulic pipe bending machine.