DONG CO TRUYEN DONG THANG MAy
D~ dnh chc;m d11QC cOng su!t dQng co truy~n d¢ng tbang may clin cO cac di~u ki(!n vA tham s6 sau :
- So d6 dOng hQc cua thang may - T6c d¢ vA gia t6c Ion nhl'lt cha phep - TrQng tAi
- Tr~mg 111c;fng pu6ng thang.
COng su!t tlnh cua dOng 00 khi nAng tai khOng dung d6i tI"Qng d11QC dnh thea cOng thuc sau :
Trang d6 Gbl - kh6i hlQng bu6ng thang [kg] G - kh6i hlQng bAng, [kg]
v - t6c dQ nAng, [mls)
g - gia t6c tl'Qng tr11bng, [m/s2]
rz - hiQ:u suAt cUa CO" Cl1u nAng (0,5 + 0,8).
(3-1)
Khi c6 d6i trQng, cOng su!t dnh cUa dOng Cd 11k nAng tl\i dl1QC dnh thea bi~u thuc sau : Pen = {[G + GbtJi - Gdt.rz}vkg.1O-3, [kW]. (3-2) VA khi hl;l tAi
(3-3)
Trang d6 : Pen - cOng su!t dnh cua d¢ng 00 khi nAng co dung d6i trQng P eh - cOng sul'lt dnh cua dQng 00 khi hl;l co dung d6i trQng Gdt - kh6i 111Qng cua d6i trQng, [kg]
k - ~ Oil tlnh Mn rna sat gifta thanh WIn bUbng va d& tn,mg (k = 1,15 + 1,3). Kh6i 111c;mg cua d6i trQng dl1QC dnh thea bi~u thuc sau dAy:
Gdt = Ghl + aG, [kg]. (3-4)
;
'.
Phlin 16:n cac thang mAy eM khach chI v$,n hAnh dl1y titi trvng nhung gtb can di~m, thOi gian -dm l~i luOn lam vi~c non tAi ; cho n€m d6i vdi thang may cha kMch n~n ChQD M a6 a ::= 0,35 -I- 0,4.
D6i v{Ji thang may chc'J hllng, khi nling thllbng IS. diiy tl).i vii khi hl;l thu:bng Iii. khOng
tAi, nlm chc;m a = 0,5.
D\ia t~n hai bi~u thuc (3-2) va. (3-3) c6 the xAy dl,1'ng dllt;JC biell dfi ph\! tAi vA chc;m ad bl) cOng sullt cua dOng co thea s6 tay tra CUll.
Mudn xAy d\ing bi~u d6 ph1,l tAi chtnh xac, din phAi dnh d~n thbi gian rna may, thbi gian hl1m, thai gian dong, rna cua va 86 IAn dling cua bu6ng thang khi chuyen dl;lng.
ThOng s6 tllCfng d6i M tfnh toan cae thai gian trlln dllQ'C dua ra trong bAng 3-1. Thbi gian ra, vAo bu6ng thang dllQC dnh gl1n dung ls/l ngubL 86 lAn dung (dnh thea XBC su.!It) eua bu6ng thang co the dm thea cae dubng cong tr€!n hlnh 3-3.
T6e dO di ehuyen (m/s) 0,5 0,75 1,0 1,5 2,5 3,5 18 16 14 12 10 8 6 4 2 V V Bimg 3-1
Thbi gian rna may T6ng thbi gian cOn l~i (8)
vii hl1rn may v(1i khoang
Bu6ng thang Bu6ng thang Bu6ng thang each giua ella Ung (s)
cd ci'ta r¢ng co etta r¢ng e6 ella rOng 3,6 met .. 7,2 met duili BOOmm dulli BOOrnm dulli 1000mrn
(md bAng tay) (meJ t~ dQng) (rna tV' dOng) , 1,6 1,6 12,0 7,0 - 1,6 1,6 12,0 7,0 - 1,8 1,8 13,0 7,0 6,3 1,8 1,8 - 7,2 6,3 2,8 2,0 - - 6,5 3,2 2,5 - - 7,0 --- E 21n uai / ' .-- E-1 ngui / " ..------ .<,. r" E 13ng yo; f;:: / E lOng 0/ :----.-- E 5nau '; 5 10 14 18 22 26 30 34 38 42 46 50 m,
Hlnh 3-3. Dl1dng cong de x.IIc dinh ~ illn dung (thoo xAc suJll) Clla bu6ng thang. md - sO lIin dung; rn,. - s6 tA:ng ; E - s6 ngtlOi lrung bu6ng thang.
'.
Phuong phap dnh ch!;m cOng Built d¢ng CO truy~n d¢ng thang may til!n hanh theo cac bulic sau dAy :
1. nnh IIjC kea d~t len puli cap kea bu6ng thang a tAng dulii dmg va cac IAn dung ti@'p thea :
Trang do :
kl - s6 llin dung cua bu6ng thang.
6.G1 - thay d6i (giam) kh6i h1Qng tM sau m6i hin dung. g - gia t6c tr(;mg truong, [m/s2].
2. Tlnh m6men tuong ung vai lljc kea.
M F.R i.I[ , [Nm] nl!u F > 0
va : M ~ -,-12 , F.R . [Nm], n@'uF<O. Trang dci R - ban kfnh cua puli, [m].
i - ty 96 truy~n cua cd ~u.
'1 - hi~u sucH cua co cAu.
(3-5)
(3-6)
3. Tfnh t6ng thbi gian hanh trinh nAng va h~ cua bu6ng thang baa g6m : thai gian bu6ng thang di chuyl!n vai t6c dQ 6n dinh, thbi gian rna may va hlim may va t6ng thai gian ron l~i (thai gian dong rna cua bu6ng thang, thbi gian ra vao buang thang cua
hanh khach) thea bang 3-1.
4. Dy-a tr~n k@'t qua cua cac buac tlnb tmin tr~n, tinh mO men dAng trj va tinh chon cOng sullt de)ng cd.
5. XAy dljng bi~u do ph1,l ali chlnh xae cua de)ng cd truyl'!n. de)ng co tlnh den cae qua trinh qua de) va ti@'n hanh ki@'m nghi~m cOng sullt dQng cd dli ch<;>n thea di~u ki~n phat nong, qua till.
§3.4. ANH HuUNG ellA Toe DQ, GIA Toe VA DQ D~T (DAO HAM
B~e NHAT ellA GIA TOC) DOl veil He TRUYEN oQNG THANG MAy M9t trang nhung y~u cAu Cd ban d6i vOi M truy~n d¢ng thang may la ph!ll dam baa