下管机设备：下管机在一步法生产线中主要起到下成品管的作用，机组运行时通过变频调速，可以实现多段速运行，快速下成品管，与拨管器配套使用可以实现快速下成品管。The pipe laying machine :The pipe laying machine mainly plays the role of laying the finished product pipe in the one-step production line. When the unit is running, it can realize multi-stage speed operation and fast laying of the finished product pipe through frequency conversion and speed regulation, and can realize