15
fixed at the base with bolts, the centers of the upper and lower bearing are at the same
plumb line and form the azimuth axis.
The annular contact thrust spherical-roller bearing 9069332 is installed in azimuth lower
bearing pedestal, the knuckle sliding bearing is installed in azimuth upper bearing pedestal.
The upper and lower axle heads are respectively installed into the upper and lower
rotation axle pedestal holes. In this way, the azimuth-elevation bearing combination can
perform azimuth movement under the role of the azimuth driving device, the azimuth
travel range is within ±90º.
3.1.2.2 Elevation Part
The elevation part mainly consists of the azimuth-elevation bearing combination,
driving pedestal E, elevation bearing pedestal combination, etc.
On the support arms at the two sides of decumbent cylinder at the top of azimuth-
elevation bearing combination, there is a pair of axle holes orthogonal with the azimuth
axis, in which are the bearings. The two axle holes connect the elevation bearing pedestal
combination with the decumbent cylinder via the clevis pin with head to form the
elevation axis E. In this way, the antenna can perform the elevation movement under the
role of elevation driving device. The elevation rotation range is within 0º~90º.
3.1.2.3 Driving Device
The driving device consists of the elevation driving device and azimuth driving device.
The driving device composition block diagram is shown in Fig.3.1-11. The azimuth and
elevation driving devices are lead screw type. The decelerator of driving device
adopts SG-71 type plane secondary envelope worm pair. The decelerator adopts cycloid
pin wheel decelerator and planetary gear decelerator.
Fig.3.1-11 Driving Device Composition Block Diagram
