FH-141 Spiral Bending Machine for Hot Runner Tubes Driven by the feeding motor (the mandrel can be replaced), the mandrel is cleverly installed with pneumatic clamps, and the heating tube to be bent is pressed tightly by the pneumatic mechanism. The stepping motor drives the heating tube to coil along the axis direction. The machine has an automatic unloading mechanism, the whole machine is controlled by PLC, and the production efficiency is high.