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Pakatikati mwa mbale yapansi pali malo ozungulira, omwe amafanana ndi mbale yapakati ya convex.Pali mbale ya PTFE yooneka ngati arc yomwe ili pakati pa ziwirizi.Malo ozungulira amatsetsereka nawo kuti akwaniritse kuzungulira kwa mtengowo;mbale yachitsulo chosapanga dzimbiri pampando wapampando wapamwamba imakhala pazitsulo zapakati.Mbali ina ya tetrafluoroethylene imapanga chachiwiri chotsetsereka, chomwe chimamaliza kusuntha ndi kuluka kwa mtengowo chifukwa cha zifukwa zambiri za kusiyana kwa kutentha.
1. Mpira wonyamula umatulutsa mphamvu kudzera pamtunda wozungulira, ndipo palibe chodabwitsa cha khosi, ndipo mphamvu zomwe zimagwira ntchito pa konkire zimakhala zofanana;
2. Mpira wonyamula amazindikira njira yozungulira yonyamula kudzera pakutsetsereka kwa mbale yozungulira ya polytetrafluoroethylene.Torque yozungulira ndi yaying'ono, yomwe ili yoyenera kwambiri pazofunikira za ngodya.Ngodya yamapangidwe imatha kufika kuposa 0.05rad;
3. Kunyamula kumakhala ndi ntchito yozungulira yofanana kumbali zonse, yomwe ili yoyenera milatho yayikulu ndi milatho yokhota;
4. Kunyamula sikuyenera kukakamizidwa ndi mphira, ndipo palibe chikoka cha ukalamba wa rabara pa ntchito yozungulira yonyamula.Ndizoyenera makamaka kumadera otentha otsika.
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