High frequency tube welding machine and double roller automatic bore positioning device

The utility model discloses a double roller automatic bore positioning device of a high frequency tube welding machine, comprising a leading screw, a pressure plate, a row rack and an upper bearing box and a lower bearing box. The utility model is characterized in that the lower surface of the lower bearing box of a bore positioning roller is provided with a butterfly-shaped spring. Because the device is provided with an elastic device, the automatic bore positioning for a sutural steel tube can be achieved by using a double roller when a factory uses the device, which reduces tubes with splits and improves the quality of products. So the national standard can be achieved after once bore positioning, which omits frequent artificial regulating.