Contrast application finds that the ultrasonic cleaning is the best method is melt cutting and edge finishing as well as cleaning.

In this paper,the principle,the operating charcteristic of the selvedge device of plan- etary gearon jet loom have been analyzed and calculzted,and also the main parameters' seffects of motion have been discussed.

It was applied in some small-sized hydraulic engineering in our country since 1990 s,but its performances were not studied and lacked of engineering design materials,especially the strength depression coefficient of hook and beam at quadrangle interlock concrete block design were less reported.

In the design, standing seam water-proof system is adopted, which, with the panel surface not being penetrated, has avoided seepage from principle,and is of strong wind-resistance, deformation resistance and anti-corrosion.

For the complicate shape of back roof in Hangzhou Grand Theatre,we adopt the international ad-vanced waterproof system of tapered aluminium magnesium manganese alloy with standing seam.

Basing on the metal roof project of Shenyang Olympic Stadium, it introduces compound standing seam metal roof system .

Based on workflow of subcompartment dividing,a series of supplementary functions taken the edge locking as its center were developed to ensure the consistency of division and to improve efficiency of wark.