11
Fig.3.1-7 Reflector Backups Schematic Diagram
The HUB is the basic stressed component in the antenna structure and also the
connection component between the antenna reflector and antenna pedestal. All loads of
antenna reflector are down-transferred concentratively through the HUB. So the
HUB must have higher rigidity.
The appearance design of HUB is tapering barrel type, the bottom diameter is
φ
4300mm,
the height is 1300mm, the coning angle is 76°. The tapering barrel is made of steel plate
(t=8), the top and bottom (t=10) are seal-welded with flange. 28 heterotypic ribs are in the
corresponding positions of the HUB and radiating beams. One ring and two rings
of concentric circular rib plates with the height of 200mm are respectively at the top and
the bottom, so the cellular structure is formed in the whole HUB to make it have
maximum rigidity. The polyphenyl heat insulating material with thickness of 50mm is
stuck in the tapering barrel of HUB to constitute the high frequency room after built-in of
fireproofing decorative plates for installation of general equipment and high
frequency receiving components, of which minimum available volume is
φ
2800
×
1200
and which has larger and comfortable environment space. In order to meet the
requirement of transportation, the HUB is designed as bilateral symmetry connection
type, the thickness of connection steel plate is 16mm, the material type is Q235A, the
fastener is M20 high intensity bolt, as shown in Fig.3.1-8.
The radiating beams is one of the main stressed components in the antenna reflector
space reticular truss structure. It is the planar truss constituted by top boom, low boom,
normal web member and diagonal web member through spherojoint welding. Its main
