Spiral welded pipeline steel pipe diameter measuring device

The utility model relates to the technical field of spiral welded pipeline steel pipe diameter measurement, in particular to a spiral welded pipeline steel pipe diameter measuring device, which comprises a hanging arm arranged on a steel pipe former. The spiral welded pipeline steel pipe diameter measuring device is characterized in that a fixing shaft is arranged on the hanging arm of the former, the end of the fixing shaft is connected with a circular connecting plate with a laser sensor through a bearing, a rotating gear with inner teeth is fixed on the connecting plate and is in mesh connection with a pinion arranged on an electric device, and the electric device is connected with the fixing shaft through a supporting base and utilizes an alternating current servo motor. The spiral welded pipeline steel pipe diameter measuring device has the advantages that the device utilizes the laser sensor to measure, calculates steel pipe diameter (inner diameter) via PLC, can realize continuous tracing measurement, and is accurate in result, convenient in operation and high in work efficiency.