With structural design of the hoist jib, analysis and calculation are made in such aspects as material, type of the boxtype section, and the local stability of the web plate.
The performance of the box-type solar collector was investigated experimentally, the cover of which is a high-vacuum plane glass plate with a middle narrow slot.
用窄缝高真空平面玻璃作普通箱式太阳灶的透明盖板，对箱式太阳灶的集热性能进行了实验研究。
3
The blade in the intermediate shaft adopts boxplatetype structure, to improve production efficiency; the blade adopts Q345 wear-resistant material, to extend the service life.