Host computer head

The utility model relates to a host computer head, including the aircraft nose base, the top surface of aircraft nose base is fixed with horizontal axis bearing and curved boom support, it is provided with the vertical axis bearing to be close to horizontal axis bearing one side on the curved boom support, the curved boom support steps up the arm through the rotation axis with the rotation to be connected, and rotatory inboard of stepping up the arm is provided with and presss from both sides tight gear. The inside of aircraft nose base is provided with closing cylinder, closing cylinder's output and the rotatory arm that steps up articulate. Compared with the prior art, the utility model discloses at least, has following advantage: through stepping up the transmission to the pipe fitting of different pipe diameters after the adjustment, also the pipe fitting rotational speed that the DC geared motor rotational speed obtained different pipe diameters is adjusted to the accessible on the slew velocity of pipe