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The main function of the tube expansion machine is to expand the diameter of the metal tube end, and then make it close to the connecting part of the boiler tube plate, so that it will not leak and leak, and can withstand a certain pressure. Automatic control instrument, automatic control of expansion, to avoid leakage caused by insufficient expansion, to avoid excessive expansion caused by cracks and tube warping deformation. It is suitable for boiler manufacturing and installation, petrochemical heat exchanger and condenser, locomotive manufacturing and maintenance.

The working principle of the tube expander is that when the electric tube expander drives the tube expander plugged into the tube hole to rotate clockwise, the rotating Angle will be generated between the expansion bead of the tube expander and the tube, so that the tube expander will move forward along the axis of the tube when rotating. Since the front of the tube expander is thin and the back is thick, the rolling of the expansion bead will make the tube slowly expand and closely connect with the hole wall of the tube plate. During the expansion of the tube, because of the continuous expansion of the tube expander, the rotation provided by the tube expander will gradually become larger, and the motor current of the tube expander will also increase. After sampling the current of the digital controller and enlarging the analog-to-digital conversion, the digital display of the actual working current will be made. After the comparison between the comparator and the pre-set expansion value, the controller controls the motor to stop automatically when it reaches the set value. After the delay interval of the delay circuit, the controller automatically drives the tube expander to reverse counterclockwise, so that the tube expander begins to loosen. When the release time reaches the pre-set exit time, the controller disconnects the motor power supply of the tube expanding machine, and the tube expanding machine stops, thus completing a tube expanding process.