- May dao gau thu~ thich hgp kh6i dao cao hon m?tbdng may dUng va nang sudt cao.
a. May sang rung (Hinh 5.13)
May sang rung la 10l;lisang bfuIg, dugc chia thilnh 2 lol;li:may sang rung co m(it sang nghieng (10°_25°) va may sang rung co m(it sang ngang.
- May sang rung co m(it sang nghieng hay con gQi la sang rung vo huang (hinh
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Hlnh5.13: Sang rung vo hu6ng
I. H(lp sang; 2.U>xo; 3. D(lng ca; 4. B(l truy8n dai; 5. Banh I~chtam 6. Tr\lc quay; 7. Milt sang; 8. Milt sang
May sang nay khac vai sang I~c I~ch tam la bien d(\ dao dQng clla clla sang t1 I~ nghjch vm till trQng tren m(it sang, do do may co tac d\lllg boo v~ khi qua tal.
Cac 10(limay sang nay dugc dUng dB sang phfuI 10l;lisan phk cu6i cllng trong dieu ki~n lam vi~c n(ing ho(ic dugc dUng de sang sab(\ v~t li~u co kich thuac Ian truac khi dua vao may nghien tho (nghi~n giai dO(lll I).
May sang 10l;linay thuemg co kich thuac m(it sang (1780xI450)mm, t6c d(\ quay ella tf\lC gay rung khoang 800v/ph, bien dQ dao d(\ng khoang (3,7-4,5)mm.
- May sang. rung co m(it sang ngang: hay con gQi la sang rung co huang: (hinh5.14)
2 --7--- -"':~---~ -- 2 3 /
Hiob 5.14: May sang rung co hu6ng I.H(\p sang; 2- M\it sang; 3- L6 xo; 4- B(\ gay rung
a;
May sang c6 bQ gay rung 4 d(it c6 dinh tren hQp sang 2. BQ ph~ gay rung g6m 2 tI\lc cam (tren cac tl1lC co I~p cac banh I~ch tam d6 gay rung) d(it song song va quay vm cUng t6c dQ va nguqc chi6u nhau. L\lc gay rung do bQ gay rung t?o ra se co huang theo theo duimg th~g vuong goc vm duimg n6i tam cua hai tI\lc va thay dbi theo quy lu~t hlnh sin. Ooc giita phuong cua I\lC gay rung va m(it sang thuimg til (35°-45°). Hop sang cUng vm m(it sang t\la tren cac 16 xo dUng, ho(ic t\la tren cac nhip d(it vuong goc vai huang tac d\lllg cua I\lC gay rung. ThOng thuimg cac may sang lilm vi~c co hi~u qua hon khi hQp sang Wa tren cac 10 xo.
Cac may sang 10l;Unay thuimg co kich thuac m(it sang 1.259x3.000mm, tAn s6 dao dQng tren (500-700) lfuvph, bien dQ dao dQng (8-12)mm, cong suftt dQng co khoang 5,5 kW
May sang rung co huang co nang suftt rieng (nang suftt tren I m2 di~n tich m(it sang) cao hon va co chftt sang luqng t6t hon so vm may sang rung co m(it sang nghieng.
May sang co bQ gay rung 4 d(it c6 dinh tren hQp sang 2. BQ ph~ gay rung gbm 2 tI\lc cam (tren cae tI\lc co I~p cac banh I~ch tam d6 gay rung) d(it song song va quay vm cung t6c dQ va nguqc chi6u nhau. L\lc gay rung do bQ gay rung tlilOra se co huang theo theo duimg th~g vuong goc vm duimg n6i tam cua hai tI\lc va thay dbi theo quy lu~t hinh sin. Ooc gifra phuong eua I\lCgay rung va m(it sang thuimg tir (35-45°). Hop sang cung vm m(it sang Wa tren cac 10 xo dUng, ho(ic t\la tren cac nhip d(it vuong goc vm huang tac d\lng cua I\lC gay rung. Thong thuimg cac may sang lilm vi~c co hi~u qua hon khi hQp sang t\la tren cac 10 xo.