环形桁架顶部设置导轨，其内部条形桁架可在环形内部空间范围内延导轨移动；

Truss top annular guide rails, which guide rails may extend to the internal truss bar movable within the annular inner space range; internal truss bar top and bottom rails are disposed perpendicular to each other, and the bottom rail is connected to the imaging system, the imaging system may be either an internal extension bar bottom transverse truss rail (longitudinal) movement, but also the longitudinal (lateral) movement of the inner bar with the truss.

The inner bar truss can be set up within the inner space of the ring, the inner bar truss can be set within the inner space of the guide rail, the inner bar truss top and bottom are set to each other vertical guide, the bottom rail is connected to the camera system, the camera system can extend the internal bar truss bottom rail horizontal (portrait) movement, It can also be moved vertically (horizontally) with the inner bar truss.

The top of the ring truss is provided with guide rails, and the inner strip truss can move along the guide rails within the scope of the ring inner space; the top and bottom of the inner strip truss are respectively provided with mutual vertical guide rails, and the bottom guide rails are connected with the camera system. The camera system can not only move horizontally (longitudinally) along the bottom guide rails of the inner strip truss, but also move longitudinally (transversely) together with the inner strip truss 。