- May nang dan giim May nang ki~u cful
Ir Trongdo:
Trongdo:
- Q: hii tr9ng hang nang (Kg)
r: han kinh trung hinh cua tI'\lc vit (m) I: chieu dai tay quay (m)
u: goc nang ren vich (dQ)
p- goc rna sat, (+) khi nang v~t va (-) khi h~ v~t d~ hang co th~ giit {, mQt vi tri nao do khi nang, tuc Ia tI'\lc vit khong quay nguQ'c I~ phili dam bao di~u ki~n tg ham tuc la u<
p , nguai ta thuang I~y u =4+6°.
2 ....3 ,_ 3 ,_ '. ,',~ '.••... ) / A •••••••••
Hinh 3.2. Cdu t<tokich vit I.Than kich;2.Vit;3. Mli 6c;4. Tay kich
5. Vit d8 chuy8n dQng djch ngang; 6. Gill dO'khi djch chuy8n ngang
7. Tay l~c co cdu dich ngang;
8. DAu kich;9. Chi ti~t dinh vi
Kich vit thuang che ~o ra vm ill trQng nang tir 2 den 50T, khi tai trQng Ian hon 20T thuang d~t them b(\ truy~n tI'\1cvit- banh vit de giam nhc; I\lc tac d(\ng len tay quay. Ngum ta thuang sir d\U1gkich vit trong I~p rap va sira chUa ho~c ca gim bOa cac cong vi~c nang c6p pha, gian giao,ket d.u dO",...
c. Nguyen IYlam vi~c: Khi quay tay vit thi vit quay theo.
Do dai 6c c6 dinh nen vit se chuyen d(\ng tinh tien len (ho~c xu6ng) de nfulg h(l v~t. Mu6n dich chuyen b~ nang va v~t theo phuong ngang ta quay vit chuyen ngang.
Ue thu~ lqi khi sir d\U1g,ngum ta thiet ke tay quay t\l d(\ng. 3. Kich thuy lY'c: (kich ddu)
a. du t\lo: (Hinh 3-3)
Kich thuy l\lcgam xi lanh chinh 6dang thm la vo kich, pittOng nang h(l v~t 5,pittOng dful d(\ng I, cae van m(\t chi~u 3,4 va van thai 7. ChAt long trong kich la ddu kholing ho~c nuoc pha glyxelin.
Q } ., } ., ~: D ,// ! 5 I d I. ; .J \ 4
Hinh 3-3. Sade,cAutao kich tMy Ilfc
I-Bam ddu ki~u xilanh- pittilng; 2- Thimg chua ddu; 3,4- Van bi m(\t chi~u; 5- Pittong kich;6-xilanh kich; 7- Khoa ddu; 8- Tay kich b. Nguyen Iy lam vi~c cua kich thuy Ivc
Khi I~c tay kich s6S sang trai (nguQ'c chi~u kim dang ha), pittOng s6 I cua bam ddu tinh tien sang phai t(lOra chan khong trong xilanh bam ddu. Khi do van bi s6 3 rna ra, van s6 4 dong, ddu tir thling ddu s6 2 qua van 3 vao trong xilanh bam ddu. Tiep theo, I~c tay kich sang phai (thu~ chi~u kim dang ha), pittong s6 I tinh tien sang trai.
Ap suAt trong xilanh I tang len van 3 dong I(li, khi ap suAt trong xi lanh I de ddy van bi Clla van m(\t chi~u 4 rna ra dua ddu tir trong xi lanh I vao xilanh kich s6 6, ddy pittOng s6 5 di len.
Kich thuy l\lc dful d(\ng bfulg tay co tai trQng nang tm 200T va chi~u cao nang (0,15- 0,2)m. Kich thuy l\lc dfuld(\ng bfulg may co tai trQng nang tm 500T. Bam d~t trIlc tiep tren kich hoac n6i vm kich qua h~ th6ng 6ng dful. M(\t bam co the dful d(\ng m(\t kich ho~c nhi~u kich.
Khi nang nhiing cong trinh Ian nhu nhip cdu, 10 cao, tang I~p ghep duc sfuI cua nha ... voi trQng Ian den hang nghin tAn, ngum ta dung dang thm m(\t s6 kich chdt long
dugc n\lptil tr\llDbam. Cac van phan ph6i va cac khao cho phep cac' kich co th~ lam v* d6ng thai hay dQc I~p.
a. Cong dyng: DUng d~ nang cac v~t n~g co th~ tm 200T len caoSOcm bfulgs(r~ ngum.
Kich thuy hrc thOng d\lIlg coUn trgng nang nang d~n SOT.
Kich thuy h,rc co Un trgng nang val tram tfin (co 10\li d~n 700T) dugc dUng d~ sila chfra cac nhip cAu, thao I~p cac ch6t xich di chuy~n Clla may banh xich, .:~
Kich co tai trgng nang IOn dUng may bam thuy l\I'c thay cho bamlay ... 3.2.2. Too
1. Cong dyng: DUng d~ keo v~t sang ngang ho~c nang v~t duai lOT, len cao 10m. .' 2. Phin IOtli:
o Theo ngu6n dQng l\I'c quay tm co tm lay va tm may.
o Theo s6 6ng tm co tm dan (I 6ng) va tm kep (nhi~u 6ng).
o Theo phuang phap truy~n l\I'c co tai banh rang va tm rna sat.
o Theo cong d\lIlg co tai nang, tm keo, tm quay. 3. Cdu ttlo chung: (Hinh 3-4).
rfu ~-~ . " . ." / !. .! .' ~ !. 1-/ "". o ~ : . - ~-- T TT
Hinh 3-4 Sadb cAu410 tai 1 - 6ngUri; 2 - H(\p giam t6c; 3 - D(\ng ca di~n;40 N6i irvc va ham; 5,-Rang rQctreo cap; 60 Mac treo vat
Nhu v~y, dQng l\I'c quay 6ng tm cu6n cap la ngu6n di~n. HQp giiim t6c co tac d\lIlg giam t6c dQ quay cho phil hgp vm t6c dQ nang v~t, d6ng thm tang moment Clla 6ng tm.
2. Day too:
a. Thimg, chao: DUng cho tm tay dan gian 10\linhl(.
b. Cap: DUng d~ keo ho~c nang v~t n~g. Cap dugc ch~ l\lo tir nhfrng sgi thep nhO.co duang kinh til (0,3 +- 3)mm. ThOng thuang cac sgi thep nay dugc xo~ vm nhau thilnh bo nhO; r6i cac bo nho xo~ vm nhau thilnh cap. Gifra cac b6 nho co d~t mQt lOi gal co tfun dfun dAu nhan. Ngum ta hay sil d\lIlg 10\licap xo~ thu~ co nhi~u bo nho, m6i bo co nhi~u sgi rAt milnh vi 10\li cap nhU v~y deo, gifr nguyen hinh d\lllg khi bi xo~ v~ va khi bi cang m\lnh'
3.2.3. Pa lang
1. Palang di~n:
Palang di~n la mQt tai di~n co k~t cAn ggn, cac bQ ph~ dQng ca di~n, hQp giam t6c va tang tm dugc b6 tri th~g hang vai tang tm a gifra. LO\li may nay thuang dugc treo tren
"t. t. o o o o o J ... Hlnh 3-6:
cAu~o pa lang xich truy8n dQngttvc vft - banh vit 1. Xich tal; 2. Phanh til dQngco b8 rni).trna sat khong tach rm;
3. Dia xich keo; 4. Banh vit; 5. Moc treo palling; 6. Dia xich dful dQng;7. Tf\lc vft;
8. Xich dfulvot~n;9 Moc treo v~t
.~
cao d~ nang v~t, va co th~ co co cAu di chuy~n tren mQt ray hoi).ctren canh dum Clla dfun thep I di).ttren cao.
PaIang di~n duqc co th~ su d\lIlg dQc I~p d~ keo v~t hoi).cdiing lam ca cAu nang Clla cAntrvc thieu OOi,d.u trvc.
TruOng hqp treo palang tren cao va diing 1 day cap d~ keo v~t thi v~t nang co th~ xoay hoi).c dao dQngqua llji do cap rlU tren b~ mi).t tang. l)~tranh cac hi~n tuqng nay, paIang di~n co hai day quAIllen tang v~ hai phia d6i xilng OOauqua mi).tphfuIg gifta tang.