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Thit K H Dn ng Ti Ko
n chi tit my_Hp gim tc 2 cp Ging vin hng dn c Nam
Li ni u
Tnh ton thit k h dn ng c kh l ni dung khng th thiu trong chng trnh o to k s c kh . n mn hc Chi tit my l mn hc gip cho sinh vin c th h thng ho li cc kin thc ca cc mn hc nh: Chi tit my, Sc bn vt liu, Dung sai & lps gheps, V k thut .... ng thi gip sinh vin lm quen dn vi cng vic thit k v lm n chun b cho vic thit k n tt nghip sau ny.
Nhim v c giao l thit k h dn ng t ke gm c hp gim tc bnh rng v b truyn ai. H c dn ng bng ng c in thng qua b truynf ai ti hp gim tc v s truyn chuyn ng ti tang quay.Do ln u tin lm quen thit k vi khi lng kin thc tng hp cn c nhng mng cha nm vng cho nn d rt c gng tham kho cc ti liu v bi ging ca cc mn c lin quan song bi lm ca em khng th trnh c nhng sai st. Em rt mong c s hng dn v ch bo thm ca cc thy trong b mn em cng c v hiu su hn , nm vng hn v nhng kin thc hc hi c.
Cui cng em xin chn thnh cm n cc thy trong b mn, c bit l thy cs Nam trc tip hng dn, ch bo cho em hon thnh tt nhim v c giao .
Mt ln na em xin chn thnh cm n !H ni, ngythngnm 2007 Sinh vin thc hin
Nguynx V Binhf
Thit K H Dn ng Ti Ko
S liu cho trc - Lc ko bng ti F=8400 [ N ]
Vn tc ko cp v=0,7 m/s
ng knh tang D=340 mm
Thi hn phc v lh=19000 h
S ca lm vic : S ca =2
Gc nghing ng ni tm b truyn ngoi = 300 c tnh lm vic : va p vachng I: chn ng c in1.Chn ng c in
1.1.Xc nh cng sut t trn cc trc ng c
Trong :
Pct (kW) l cng sut trn trc my cng tc
(: l hiu sut ca HD
Ta c
F (N): lc ko bng ti
Hnh 1v (m/s): vn tc di ca bng ti
: H s ti trng tng ng, c tnh nh sau:
, ( l hiu sut ca cc b truyn v ca cc cp c trong h thng dn ng (c th chn theo bng 2.3 ti liu TTTKHDCK - T1)
(=(ot. (k. (ol3(br2(dTrong .
(ol Hiu sut ca ln
(ot Hiu sut trt
(kn Hiu sut khp ni
(ai Hiu sut b truyn ai
.(br Hiu sut b truyn bnh rng
Chn theo bng 2.3 ti liu TTTKHDCK - T1 ta c
(ol =0,99 ; (ot =0,98 ; (kn =1 ; (ai =0,95 ; (br =0,98
( = 0,98.1.0,993.0,982.0,95 = 0,87 Thay s vo ta c
Hnh 21.2.Xc nh s b s vng quay ng b ca ng c in
nsb = nct.usb
Trong
- nct : s vng quay ca trc my cng tc
i vi tang quay
v [m/s] l vn tc di ca bng ti
D [mm] l ng knh tang quay
T s truyn ca h thng
usb = usbH usbBtngTrong
usbH l t s truyn ca hp (chn theo bng 2.4 ti liu TTTKHDCK - T1)
usbBtng l t s truyn s b B truyn ngoi (chn theo bng 2.4 ti liu TTTKHDCK - T1)
Chn usbH = 10 Chn usbBtng =uai = 4 (tha mn nm trong khong t 3 n 5)
usb = 10.4=40nsb = 39,32.40 = 1572,8 (v/ph)
1.3.Chn ng c
Khi c c Pyc v s vng quay s b nsb, ta c th chn quy cch ng c theo bng P1.3(tr237_TK1)tha mn iu kin:
Cng sut:
S vng quay:
ng thi tha mn:
ng c c chn c cc thng s sau:
K hiu ng c in: 4A132S4Y3Cng sut danh ngha Pc =7,5 (kW)
S vng quay thc nc =1455 (v/ph)H s qu ti Tk/Tdn =2,0 >Tmm/T1=1,5Khi lng 77 kg
ng knh trc ng c 38mm (Bng P1.7_TK1_tr242) 2.phn phi t s truyn
2.1.xc nh t s truyn chunguc = ndc/nctnc(v/ph) l s vng quay ca ng c chn
nct(v/ph) l s vng quay ca trc my cng tc
uc =1455/39,32=37,002.2.Xc nh t s truyn ca b truyn trong hp
ung = uc/uh Da trn quan im v mi tng quan kch thc gia HGT v b truyn ngoi , ta chn t s truyn uai=3
uh=37,00/3 = 12,33 ung l t s truyn ca b truyn ngoi HGT (l b truyn ai)
uh l t s truyn ca HGT
Li c uh=u1.u2 vi u1,u2 ln lt l t s truyn ca hai cp bnh rng n khp
Chn phng n phn phi t s truyn uh theo phng php giI bI ton a mc tiuTheo bng 3.1(TK1_tr43) chn
Bng ni suy ta c
=> u1=4,398
=> u2=
Khi :
un=
3.tnh cc thng s trn cc trc
3.1.s vng quay trn cc trc
S vng quay ca ng c
nc=1455 [v/ph]
S vng quay ca trc 1
n1= nc/uai = 1455/3 =485[v/ph]
S vng quay ca trc 2
n2 =n1/u1 = 485/4,398=110,28 [v/ph]
S vng quay ca trc 3
n3=n2/u2=110,28/2,80=39,38[v/ph]
3.2.Cng sut trn cc trc
Cng sut trn trc 3
P3=Pct/ot.k=5,88/0,98.1=6,00Cng sut trn trc 2
P2 = Pct/(ol .(br =6,00 / 0,99.0,98 =6,18 [Kw] Cng sut trn trc 1
P1 = P2 / (ol .(br = 6,18/0,99.0,98 =6,37 [Kw]
Cng sut thc trn trc ng c
Pc = P1 / (ol .(ai = 6,37/0,99.0,95 =6,77 [Kw]
3.3.Mmen xon trn cc trc
T cng thc: Ti = 9,55.106.Pi/ni ta tnh c:
Mmen xon trn trc ng c
Tc = 9,55.106.Pc/nc = 9,55.106.6,77/1455 = 44435,39 (Nmm)
Mmen xon trn trc I
TI = 9,55.106.PI/nI = 9,55.106.6,37/485= 125429,897 (Nmm)
Mmen xon trn trc II
TII = 9,55.106.PII/nII = 9,55.106. 6,18 /110,28= 535174,10 (Nmm)
Mmen xon trn trc III
TIII=9,55.106.PIII/nIII=9,55.106.6,00/39,38=1455053,33 (Nmm)
Mmen xon trn trc cng tcTct = 9,55.106.Pct/nct = 9,55.106.5,88/39,38 =1425952,26 (Nmm)
Bng 1. Cc thng s trn cc trc
Trc
Thng sng c IIIIIITrc ct
P (KW)6,776,376,186,005,88
U 3,00 4,398 2,80 1
n(vg/p)1455485110,2839,3839,38
T (Nmm)44435,39125429,897535174,101455053,331425952,26
chng II: thit k cc b truyn
1.thit k b truyn ai thang
Cc thng s u vo:
+> Cng sut thc ca ng c : P/dc=6,77 kW
+> S vng quay trc ng c : ndc=1455 v/ph
+> T s truyn : u=3,00
+> Gc nghing ng ni tm 2 bnh ai : 30o1.1.Chn loi ai:
T hnh 4.1 (TKI_tr59) vi cng sut cn truyn 6,77 kW;
S vng quay ng c 1455 v/ph ta chn tit din ai Cc s liu kch thc ai tra bng 13.3(TLI_tr22) nh sau: b0 =14 mm b = 17 mm
h = 10,5 mm y0 = 4,0 mm
A1 = 138 mm2l0 = 2240 mmChiu di gii hn : 800 6300 mm
Khi lng 1 m ai : 0,18 kg/m
Hnh 3T bng 13.5 (TLI_tr23) cho d1min=125 mm
1.2. Xc nh cc kch thc v thng s b truyn :
1.2.1.Chn ng knh bnh ai nh :
Ta c : d1=(1,11,2)d1min =(1,11,2).125
=137,5150 (mm)
T bng 4.26 (TKI_tr67) chn d1=140 mm
Vn tc ai :
V= (m/s)
Tnh ng knh bnh ai ln:
d2 = u.d1.(1- )
vi : h s trt , chn = 0,02
d2 = 3.140.(1- 0,02) = 411,6 (mm) => chn d2 = 450 mm theo tiu chun
1.2.2.Chn khong cch trc :
Chn s b khong cch trc tho mn :
0,55.(d1+d2) +h a 2.(d1+d2)
0,55.(140+450) a 2.(140+450)
335 a 1180
Chn s b a = d2 = 450 mm
Theo cng thc tnh chiu di ai :
L=2.a +
L=2.450 + = 1880 (mm)T bng 4.13 (TKI_tr59) chn chiu di ai tiu chun : L = 1800 mm
Tnh li khong cch trc a
a =
a =
a = 407 (mm)
Gc m ca ai trn bnh ai nh
1 = 1800 -
1 = 1800 - = 136,590 > 1200 (tho mn)1.2.3. Nghim s vng chy ca ai trong mt giy
i = < 10 (tho mn)
1.3. Xc nh s ai z
S ai z c xc nh theo cng thc
z =
Trong :
P1 : Cng sut trn trc bnh ai ch ng (kW)
N chnh l cng sut thc ca ng c P1 = Pc = 6,77 kW[P0] : Cng sut cho php
T bng 4.19 (TKI_tr62) bng ni suy ta c :
Vi V=10 m/s
x = 2,56
Vi V= 15 m/s
y = 3,16
=>
=> [P0] = 2,64 (kW)
K : h s ti trng ng
T bng 4.7 (TKI_tr55) vi ti trng m my n 150% ti trng danh ngha , chn K=1,1.
C : h s xt n nh hng ca gc m 1T bng 4.15 (TKI_tr61) ta c
C=0,88Cl : h s k n nh hng ca chiu di ai
T bng 4.16 (TKI_tr61) vi
ta c Cl = 0,95
Cu : h s k n nh hng ca t s truyn
T bng 4.17 (TKI_tr61) ta c Cu = 1,14
Cz : h s xt n nh hng ca s phn b khng u ti trng cho cc dy ai
T bng 4.18 (TKI_tr61)
vi z = ta c Cz = 0,95
Thay s vo ta c
z=
Chn z=3 ztnh-zchn = 0,11 < 0,3 (tho mn)
Chiu rng bnh ai B :
T bng 4.21 (TKI_tr63) ta c vi tit din ai t= 19 mm
e= 12,5 mm
h0 = 4,2 mm
B = (3-1).19 + 2.12,5 = 63 (mm)
ng knh ngoi ca bnh ai
da = d + 2.h0 = 140 + 2.4,2 = 148,4 (mm)
1.4. Xc nh lc cng ban u v lc tc dng ln trc :
Hnh 4Lc cng trn 1 ai c xc nh bng cng thc
F0 =
Trong
Fv : lc cng do lc li tm sinh ra , xc nh bng cng thc
Fv = qm.V2qm : khi lng 1 m chiu di ai
T bng 4.22 (TKI_tr64) vi tit din ai qm = 0,178 kg/m
Fv = 0,178.10,662 = 20,23 (N)
F0 = (N)Lc tc dng ln trc
Fr = 2.F0.z.sin(1/2)
= 2.226,63.3.sin (136,59/2)
= 1263,37 (N)
Vi t s truyn thc ca b truyn ai u = 3,21 ta c
uh =
T bng 3.1 (TKI_tr43) bng ni suy ta c
u1 =4,2
u2 =
T ta c bng cc thng s ca ai
Bng 2 . Cc thng s ca ai Thng s Gi tr
ng knh bnh ai nh d1 (mm) 140
ng knh bnh ai ln d2 (mm) 450
Chiu rng bnh ai B (mm) 63
Chiu di ai l (mm) 1800
S ai 3
Tit din mt ai A1 (mm2) 138
Lc tc dng ln trc Fr (N) 1263,37
2. THIT K B TRUYN CP NHANH (BNH TR RNG THNG)
1.Chn vt liu.
Vt liu lm bnh rng p ng cc i hi sau:
- Vt liu lm bnh rng phi tho mn cc yu cu v bn b mt trnh hin tng trc mi, mi mn, dnh rng v bn un trong qu trnh lm vic. Cho nn vt liu lm bnh rng thng l thp c ch nhit luyn hp l hoc c lm bng gang hay cc vt liu khng kim loi khc.
- Theo yu cu ca bi th b truyn bnh rng thng phi truyn c cng sut ti a chnh l cng sut truyn ln nht ca trc I l 6,37 (kW) ng vi ch trung bnh cho nn vt liu lm bnh rng thuc nhm I c cng t HB ( 350.- m bo ch tiu kinh t ta phi chn vt liu v phng php gia cng hp l cho cp bnh rng c thi gian s dng khng c chnh lch nhau khng qu nhiu.
Cn c vo cc tiu chun v Bng 6.1 (Trang 92-Tp 1:Tnh ton thit k h dn ng c kh) ta xc nh s b vt liu lm cp bnh rng nh sau:
Bnh nh: Chn vt liu thp C45 v ch nhit luyn l tin hnh ti ci thin sau khi gia cng c cc thng s k thut ( cng,gii hn bn v gii hn bn chy) ln lt nh sau:
HB = 241 ( 285; (b1 = 850 MPa ; (ch 1 = 580 Mpa
Vy ta chn cng ca bnh rng 1 l HB1 = 245.Bnh ln: Chn vt liu thp C45 cng tin hnh ti ci thin sau khi gia cng c cc thng s v vt liu ( cng, gii hn bn v gii hn bn chy) ln lt nh sau:
HB = 192 ( 240; (b2 = 750 MPa ; (ch2 = 450 Mpa
Vy ta chn cng ca bnh rng 2 l: HB2 = 230.2. Xc nh ng sut tip xc [(H] v ng sut un [(F] cho php.
a. ng sut tip xc cho php c xc inh bi cng thc nh sau:
.
Trong : - SH l h s an ton.
- ZR l h s xt n nh hng ca nhm b mt.
- ZV l h s xt n nh hng ca vn tc vng.
- ZL l h s xt n nh hng ca bi trn.
- KxH l h s xt n nh hng ca kch thc bnh rng.
Chn s b ZR.ZV.KLKxH = 1 nn ta c
Do gii hn bn mi tip xc ng vi chu k chu ti NHE c xc nh nh sau:
.
Trong : -l gii hn bn mi tip xc ca b mt rng.
- KHL l h s xt n nh hng ca chu k lm vic.
Theo Bng 6.2 (TKI_tr94) ta c cng thc xc nh v SH nh sau:
= 2.HB + 70 (MPa) cn SH = 1,1.
Vy ta c gii hn bn mi tip xc ca bnh rng nh v bnh rng ln nh sau:
((H lim1 = 2.HB1 + 70 = 2.245 + 70 = 560 (MPa).
((H lim2 = 2.HB2 + 70 = 2.230 + 70 = 530 (MPa).
H s chu k lm vic ca bnh rng c xc nh nh sau:
KHL=
S chu k c s NHO c xc nh bi cng thc nh sau: NHO = 30.HB2,4.
(
S chu k thay i ng sut tng ng NHE c xc nh nh sau:
Trong :- c l s ln n khp trong mt vng quay. Nn ta c c =1.
- Ti l mmen xon ch i ca bnh rng ang xt.
- ni l s vng quay ch i ca bnh rng ang xt.
- ti l tng s gi lm vic ch i ca bnh rng ang xt.
Vy vi bnh ln (lp vi trcII) ta c:
Thay s vo cc gi tr tng ng ca cng thc ta c:
Ta li c :
Thay s vo ta s xc nh c ng sut cho php ca bnh rng nh sau:
(MPa).
(MPa)..
Do y l cp bnh tr rng thng n khp cho nn ng sut tip xc cho php xc nh nh sau:
(MPa).
b. ng sut un cho php c xc inh bi cng thc nh sau:
Trong : - [(Flim] l gii hn bn mi un ng vi chu k chu ti NFE.
- SF l h s an ton ly bng 1,75 do b mt c ti ci thin.
- YS = 1,08 0,16.lgm l h s xt n nh hng ca kch thc rng.
- YR (1 l h s xt n nh hng nhm mt ln chn rng.
- KxF l h s xt n nh hng ca kch thc bnh rng.
Chn s b YR.YS.KxF = 1 ( .
Do gii hn bn mi un ng vi chu k chu ti NFE c xc nh nh sau:
.
Trong : -l gii hn bn mi un ca b mt rng.
- KFL l h s xt n nh hng ca chu k lm vic.
Theo Bng 6.2 (Trang 94-Tp 1: Tnh ton thit h dn ng c kh) ta c cng thc xc nh v SF nh sau:= 1,8.HB v SF =1,75.
Vy ta c gii hn bn mi tip xc ca bnh rng nh v bnh rng ln nh sau:
((F lim1 = 1,8.HB1 = 1,8.245 = 441 (MPa).
((F lim2 = 1,8.HB2 = 1,8.230 = 414 (MPa).
H s chu k lm vic ca bnh rng c xc nh nh sau:
KFL=
M s chu k c s NFO =4.106 c xc nh cho mi loi thp.
Cn s chu k thay i ng sut tng ng NFE c xc nh nh sau:
Trong :- c l s ln n khp trong mt vng quay. Nn ta c c =1.
- Ti l mmen xon ch i ca bnh rng ang xt.
- ni l s vng quay ch i ca bnh rng ang xt.
- ti l tng s gi lm vic ch i ca bnh rng ang xt.
- mF l bc ca ng cong mi khi th v un y mF = 6.
Vy vi bnh rng ln (lp vi tr II) ta c:
Tin hnh thay cc gi tr bng s vo cng thc ta c.
Ta c :
Thay s vo ta s xc nh c ng sut cho php ca bnh rng nh sau:
(MPa).
(MPa).c.ng sut cho php khi qu ti :
+ ng sut tip xc khi qu ti :
[H1]max = 2,8.ch1 = 2,8.580 = 1624 (MPa)
[H2]max = 2,8. ch2 = 2,8.450 = 1260 (MPa)
+ng sut un cho php khi qu ti :
[F1]max = 2,2.HB1 = 2,2.245 = 539 (MPa)
[F2]max = 2,2.HB2 = 2,2.230 = 506 (MPa)3. Xc nh s b khong cch trc:
Cng thc xc nh khong cch trc a( ca b truyn bnh rng tr rng thng bng thp n khp ngoi nh sau:
a(1 ( 50 (u1 + 1)
Trong : - T1 l mmen xon trn trc bnh ch ng (l trc I)
- (d = b(/d(1 = 0,5.(a.(u+1) l h s chiu rng bnh rng.
- KH( l h s k n s phn b ti trng khng u trn chiu rng vnh rng khi tnh v tip xc.
- KHv l h s k nh hng ca ti trng ng.
- u1 l t s truyn ca cp bnh rng. y ta c:
- T1 = 125429,897 (N.mm); u1 = Unh = 4.2; (a = 0,3 v [(] = 481,8 (MPa)
-(d = 0,5.(a.(u+1) = 0,5.0,3.(4,2+1) = 0,78 Tra Bng 6.7 (Trang 98-Tp 1: Tnh ton thit k h dn ng c kh) ta xc nh c KH( = 1,115 (S 3).
- Chn s b KHv = 1.
Thay s vo cng thc ta s xc nh c khong cch gia 2 trc a(1:
a(1( 50.(4,2+1). (mm)
Vy ta chn s b a(1 = 205 (mm).
4. Xc nh cc thng s n khp
( Mun ca bnh rng tr rng thng (m) c xc inh nh sau:
m = (0,01 ( 0,02).a(1 = (0,01 ( 0,02).205 = 2,05 ( 4,1.
Theo dy tiu chun ho ta s chn m = 3 mm.
* S rng trn bnh ln v bnh nh ln lt l Z1v Z2 ta c :
Chn Z1 = 26 rng.
( Z2 = U1 Z1 = 4,2.26 = 109,2 (rng).
Vy Zt = Z1 + Z2 = 26 + 109 = 135 ;Nh vy t s truyn thc cp nhanh
u1, =
Ta c
(tho mn)
Tnh li khong cch trc a :
a= (mm)
chn a = 203 mm
* y ta phi tin hnh thm qu trnh dch bnh rng tng khong cch trc t a(1 =202,5(mm) ln a(2 = 203 (mm) m vn bo m qa trnh n khp.
H s dch tm :
y = - 0,5(z1 + z2) =
H s :
ky =
T bng 6.10a (TKI_tr101) bng ni suy ta c :
kx = 0,015
H s gim nh rng :
Tng h s dch chnh :
xt = y + y = 0,17 + 0,002 = 0,172
H s dch chnh bnh rng 1
x1 = (mm)
x2 = xt x1 = 0,172-0,034 = 0,138
Gc n khp :
cos =
ng knh vng ln bnh nh :
d1 = (mm)
Vn tc vng ca bnh rng :
v1 = (m/s)
T bng 6.13 (TKI_tr106) chn cp chnh xc ch to bnh rng l 9
Chiu rng bnh rng :
b = (mm)
ng knh vng chia bnh ln :
d2 = m.z2 = 3.109 = 327 (mm)
5. Kim nghim rng v bn tip xc.
Yu cu cn phi m bo iu kin (H ( [(H] Do (H = ;
Trong : - ZM : H s xt n nh hng c tnh vt liu;
- ZH : H s k n hnh dng b mt tip xc;
- Z( : H s k n s trng khp ca rng;
- KH : H s tp trung ti trng
- KHv : h s ti trng ng - b( : Chiu rng vnh rng.
- d(1 : ng knh vng chia ca bnh ch ng;
Ta bit c cc thng s nh sau:
- T1 = 125429,897 (N.mm).
- b( =60,9 mm;
- u1 = 4,19 v d(1 = 78,23 (mm).
- ZM = 275 MPa1/2 v bnh rng lm thp tra Bng 6.5 (TKI_tr96).
- ZH = H s trng khp (( = 1,88 3,2 . Z( =
KH = 1,115 Cn
Bng 6.15 (TKI_tr107) ( (H = 0,006.
Bng 6.16 (TKI_tr107) ( go = 73.Thay s vo ta xc nh c ng sut tip xc tc dng trn bn mt rng nh sau:
(H = (MPa).Tnh chnh xc ng sut tip xc cho php ca cp rng: [(H], = [(H]. ZRZVKxH.
Vi v = 1,986 m/s ( ZV = 1 (v v < 5m/s ).Vi cp chnh xc ng hc l 9 v chn mc chnh xc tip xc l 8. Khi nhm b mt l Ra = 1,25(2,5 (m ( ZR = 0,95 vi da< 700mm ( KxH = 1. Vy [(H] = 463.1.0,95.1 = 457,71 MPa.
Do (H = 423,38 < [(H], =457,71 nn bnh rng tho mn iu kin bn tip xc.
(tho mn)6. Kim nghim rng v bn un.
bo m bnh rng trong qu trnh lm vic khng b gy rng th ng sut un tc dng ln bnh rng (F phi nh thua gi tr ng sut un cho php [(F] hay: (F ( [(F].
; (F2 = (F1 . YF2 / YF1Trong : - T1 : Mmen xon tc dng trn trc ch ng- KF( : H s tp trung ti trng.
- KFv : H s ti trng ng.
- YF : H s dng rng.
- b( : Chiu rng vnh rng.
- d(1 : ng knh vng chia ca bnh ch ng;Do
Theo Bng 6.18 (TKI_tr109.).
Cn
Bng 6.15 (TKI_tr107) ( (F = 0,016.
Bng 6.16 (TKI_tr107) ( go = 73.
Bng 6.7 (TKI_tr98) ( KF( = 1,23.Vy ta c: (MPa).
( (F2 = (F1 . YF2 / YF1 = 99,31.3,49/3,68= 94,18 (MPa).
Do ng sut un thc t bnh rng c th chu c khi lm vic xc nh nh sau.
[(F1]= [(F1].YS .YxF.YR v [(F2]= [(F2].YS .YxF. YR.
Vi m = 3 mm ( YS = 1,08 0,0695.Ln(3) ( 1. Cn YR = 1 v KxF = 1:
( [(F1] = [(F1].1.1.1 = 252 MPa.
( [(F2] = [(F2].1.1.1 = 236,5 MPa.
Nhn thy rng c hai bnh rng u p ng c iu kin bn un v :
7. Kim nghim rng v qu ti. b truyn khi qu ti (xy khi m my hoc hm my... Lc momen xon tng t ngt) khng b bin dng d, gy gin lp b mt ca rng hoc bin dng d, ph hng tnh mt ln chn rng th ng sut tip xc cc i (Hmax v ng sut un cc i (F1max lun lun phi nh hn ng sut qu ti cho php [(H]max v [(F1]max.
* ng sut qu ti pht sinh khi chy my c xc nh nh sau:
(*)
Ta c h s qu ti Kqt = Tmax/ T = 1,5.
Thay s vo cng thc (*) ta c:
Kt lun: Vy cp bnh rng ta tnh ton c trn hon ton m bo c rng b truyn cp nhanh lm an ton.8.Lc tc dng ln trc :
Lc vng :
Ft = (N)
Lc hng tm :
Fr = Ft . tg = 3206,69.tg20,380 = 1191,28 (N)
Bng 3. Thng s c bn ca b truyn cp nhanh : Thng sKH Cng thc tnh Kt qu
Khong cch trc chia a a = 0,5.m.(z1 + z2)202,5 mm
Khong cch trc a( a( = a + (x1 + x2 - y)203 mm
ng knh chia d d1 = m. Z1 d2 = m.Z2d1 = 78 mmd2 = 327 mm
ng knh lndw dw =
dw1 = 78,23 mmdw2 = 327,78mm
ng knh nh rngdada1 = d1 + 2(1+ x1 -(y).m da2= d2 + 2(1+ x2 -(y).m84,192mm333,816mm
ng knh y rngdfdf1 = d1 - (2,5-2.x1).mdf2 = d2 - (2,5-2.x2).m70,70 mm320,33 mm
ng knh c sdbdb1 = d1. cos (db2 = d2. cos (73,296 mm307,28 mm
Gc prfin gc(200
Gc n khp(t((t( = arcos(acos(t/a()20,38(
Tng h s dch chnhxt0,172 mm
Gc prfin rng(t(t = arctg(tg(/cos)200
H s trng khp ngang
1,73 mm
Vi u1 = 4,19 ta c t s truyn ca cp chm
u2 =
3.Tnh ton b truyn cp chm (bnh tr rng nghing).3.1.Chn vt liu.
Theo bng 6.1[TK1_tr92] chn:
Bnh nh : Thp 45 ti ci thin t rn HB 241 ( 285 c:
(b3 = 850 MPa ;(ch3 = 580 MPa. Chn HB3 = 260 (HB)
Bnh ln : Thp 45, ti ci thin t rn HB 241...285 c:
(b4 = 850 MPa ;(ch4 = 580 MPa.Chn HB4 = 245 (HB)
3.2. Xc nh ng sut cho php.
3.2.1.ng sut tip xc cho php:
;
Chn s b ZRZVKxH = 1 (
SH : H s an ton khi tnh v tip xc, SH =1,1.
: ng sut tip xc cho php ng vi s chu k c s;
= 2.HB + 70 ( ((H lim3 = 590 MPa;
((H lim4 = 560 MPa;
KHL=
mH: Bc ca ng cong mi khi th v tip xc,vi mH = 6.
NHO: S chu k thay i ng sut c s khi th v tip xc.
NHO = 30. H
HHB : rn Brinen.
NHE: S chu k thay i ng sut tng ng.
c: S ln n khp trong mt vng quay.
Ti , ni, ti : Ln lt l mmen xon , s vng quay v tng s gi lm vic ch i ca bnh rng ang xt.
=> ly NHE=NHO tnh => KHL3 = KHL4=1 ([(H]3 = ; [(H]4=
V b truyn l b truyn bnh tr rng nghing nn theo 6.12[TK1] :
3.2.2.ng sut un cho php:
Chn s b:YR.YS.KXF =1 => [(F] =(((F lim/SF).KFC.KFL Tra bng 6.2[TK1_tr94]: ((F lim = 1,8.HB ; SF =1,75 ;
=> ((F lim3 = 1,8.260 = 468 MPa.
((F lim4 = 1,8.245 = 441 MPa.
KFC: h s xt n nh hng ca t ti.Vi ti trng mt pha => KFC=1
KFL: h s tui th.
KFL=
mF: Bc ca ng cong mi khi th v un, vi mF = 6.
NFO: S chu k thay i ng sut c s khi th v un.
NFO = 4.v vt liu l thp 45,
NEE: S chu k thay i ng sut tng ng.
c : S ln n khp trong mt vng quay.
Ti , ni, ti : Ln lt l mmen xon , s vng quay v tng s gi lm vic ch i ca bnh rng ang xt.
Ta c : NFE > NFO => tnh ton ly NFE =NFO => KFL3 = KFL4=1
Thay vo cng thc trn ta c:[(F3 ]=468.1.1/1,75 =267,43 MPa[(F4 ]= 441.1.1 / 1,75 = 252 MPa,3.2.3.ng sut cho php khi qu ti :ng sut tip xc cho php khi qu ti ca mi bnh rng:
Theo ct6.13[TK1]:
Bnh 3: [(H]3max=2,8 (ch3 =2,8.580 = 1624 MPa
Bnh 4: [(H]4max=2,8 (ch4 =2,8.580 = 1264 MPa
Vy ta chn [(H]max =1264 MPa
ng sut un cho php khi qu ti:
[(F3]max= 0,8(ch3 = 0,8.580= 464MPa;
[(F4]max = 0,8(ch4 = 0,8.580 = 464MPa;
3.3. Xc nh s b khong cch trc: Theo ct6.15a[TK1]: aw23 = Ka(u2+1)
Vi: T2: Mmen xon trn trc bnh ch ng ca cp chm, (Nmm) ;
T2= 535174,10(Nmm) Ka : h s ph thuc vo loi rng v vt liu cp bnh rng ; Theo bng 6.5[TK1_tr96],vi bnh rng nghing Ka =43
H s chiu rng vnh rng (ba = bw/aw1;
Theo bng 6.6[TK1_tr97] chn (ba =0,3
Tra bng 6.7[TK1_tr98] ( s 5) ta c KH(=1,028 ; [(H]= 522,5 MPa
Thay s ta nh c khong cch trc :
aw23= 43.(2,75 +1). (mm)
Chn aw23 = 225 (mm)3.4. Xc nh cc thng s n khp
( Mun : m
m = (0,01 ( 0,02). aw23 = (0,01 ( 0,02).225 = (2,25 ( 4,5). Theo bng 6.8 _ bng v gi tr mun tiu chun
Chn m = 3 (mm)
Chn s b =100,do cos=0,9848,theo 6.31[TK1] ta c :
S rng bnh nh :
Z3 = 2 aw23cos/ [m(u2 +1)] = 2.225.0,9848/[ 3(2,75+1)] = 39,38
Ly Z3=39 rng
S rng bnh ln: Z4 = u2 Z3 = 2,75.39 = 107,25 (rng)
Ly Z4=107 rng
Zt = Z3 + Z4 = 39+ 107 = 146Do t s truyn thc s l :u2=107/39 = 2,74
Cos=mZt/(2.aw23)=3.146/(2.225)=0,97
=> =13,260Vi bnh rng nghing ta khng dch chnh nn x3=x4=0
3.5. Kim nghim rng v bn tip xc.
Yu cu cn phi m bo (H [(H] Theo 6.33[TK1]:
(H = ZM ZH Z( Trong : - ZM : H s xt n nh hng c tnh vt liu; ZM = 275 MPa1/3 (tra bng 6.5) ;Theo 6.35[TK1] :
tgb=cost.tg=cos(20,56).tg(13,26)=0,22 ( b=12,440vi t=tw34=arctg(tg/cos)= arctg(tg20/cos13,26)=20,560do theo 6.34[TK1] : ZH = = = 1,74 (H s k n hnh dng b mt tip xc)
Theo 6.37[TK1], =bwsin/(m)=67,5.sin(13,26)/( .3)=1,64 >1
Do theo 6.38[TK1] : - Z( : H s k n s trng khp ca rng; Z( = = =0,76 - KH : H s ti trng khi tnh v tip xc; KH = KH(.KHVKH( Tra bng 6.7[TK1_tr98]: KH( = 1,028Vn tc vng bnh dn : v = (m/s)
Theo bng 6.13[TK1_tr106] .Chn cp chnh xc 9, tra bng 6.16[TK1_tr107] chn go= 73Theo cng thc 6.42 [TK1] :
Trong theo bng 6.15[TK1_tr107] => (H =0,002
Tra bng 6.14[TK1_tr107]: KH(=1,13
( KH = 1,028.1,13.1,006 = 1,17
Thay cc gi tr va tnh c vo ct6.33[TK1] : (H = 275.1,76. 0,76.= 481,73 (MPa)
Tnh chnh xc ng sut tip xc cho php : [(H] = [(H]. ZRZVKxH.
Vi v = 0,69 (m/s ) ( ZV = 1 (v v < 5 m/s ) . Cp chnh xc ng hc l 9, chn mc chnh xc tip xc l 8. Khi cn gia cng t nhm l Ra = 2,5...1,25 (m. Do ZR = 0,95, vi da< 700(mm). ( KxH = 1.
[(H] = 522,5.1.0,95.1 = 496,38 MPa , (H [(H] .
Rng tho mn v bn tip xc.
Xt t s :
(tho mn)3.6.Kim nghim rng v bn un.
Theo ct6.43,6.44[TK1] : (F3=2T3KFYF3Y(Y(/(bw34dw3m) ( [(F3]
(F4=(F3. YF4/ YF3Trong : Y( l h s k n s trng khp ca rng
Y(=1/ (=1/1,71=0,58 Y(= 1 -13,6/140=0,91S rng tng ng :
Zv3=Z3/cos3=39/0,973=42,73Zv4=Z4/cos3=107/0,973=117,23 Theo bng 6.18[TK1_tr109], c YF3= 3,685; YF4=3,6Theo bng 6.7(TKI_tr98), KF( = 1,07; KF(=1,37: theo bng 6.14(TKI_tr107) vi v< 2,5m/s v cp chnh xc 9.
Theo cng thc
Trong theo bng 6.15 [TK1_tr107], (F= 0,006, theo bng 6.16[TK1_tr107], g0= 73.Do theo cng thc
KFv=1+(Fbw34dw3/(2T3KF(KF() =1+2,73.67,5.120/(2.535174,1.1,07. 1,37)=1,01 ( KF=1,07.1,37.1,01=1,48Vy (F3= 2.535174,1.1,07.1,37.1,01.3,685.0,91.0,58/(67,5.120.3) = 126,84 MPa
(F4= (F3 YF4/ YF3 = 126,84.3,6/3,685= 123,91 MPatnh chnh xc ng sut tip xc cho php:
[(F3] =[(F3]. YR. Ys. KxF [(F4] =[(F4]. YR. Ys. KxFvi m = 3 (Ys= 1,08- 0,0695ln(3) = 1,00: YR=1: KxF=1(da< 400), do ng sut un cho php thc t l
[(F3] = 267,43.1.1,00.1= 267,43 MPa
[(F4] = 252.1.1,00.1=252 MPa
(F3, (F4 u nh hn cc gi tr cho php, vy bn un ca rng m bo .
3.7. Kim nghim rng v qu ti
trnh bin dng d hoc gy gin lp b mt, ng sut cc i khng c vt qu mt gi tr cho php
H s qu ti: Kqt=Tmax/T1=1,5 Theo 6.48[TK1] : (Hmax= (H= 496,38 = 607,94MPa < [(H]]max= 1264MPa;
(F3max=(F3Kqt= 126,84.1,5 = 190,26 MPa < [(F3]max= 464 MPa;
(F4max = (F4Kqt = 123,91.1,5 = 185,86MPa < [(F4]max = 464 MPa;
Vy rng bn v qu ti.3.8.Lc tc dng ln trc : Lc vng :
Ft = (N)
Lc hng tm :
Fr = (N)
Lc dc trc :
Fa = Ft.tg13,260 = 8919,57.tg13,260 = 2101,92 (N)Bng 4.Thng s c bn ca b truyn cp chm : Thng s KH Cng thc tnh Kt qu
Khong cch trc chiaaa = 0,5m(z1+z2)/cos225,77 mm
ng knh vng chiadd3 = m. z3/cos
d4 = m.z4/ cos120,62 (mm).330,93 (mm).
ng knh nh rngdada3 = d3 + 2m da4 = d4 + 2m 126,62 (mm).336,93 (mm).
ng knh y rngdfdf3 = d3 2,5mdf4 = d42,5m113,12(mm).323,43(mm).
Gc prfin gc(200
Gc prfin rng(t(t = arctg(tg(/cos)20,560
Gc n khp(t((t( = arcos(acos(t/a()20(
H s trng khp(( = [1,88-3,2(1/z3+1/z4)]cos1,71
CHNG V : THIT K TRC
I.Chn vt liu : Chn vt liu ch to cc trc l thp 45 c , ng sut un cho php
II.Tnh s ng knh trc : 1.Vi trc 1 :
d1 =
Vi T1 = 125429,897 Nmm : mmen xon trn trc I
: mmen xon cho php
Thay s ta c :
d1 = (mm)
d1 = 35 mm
T bng 10.2(TKI_tr189) chn s b chiu rng ln : b0 = 21 mm
2.Vi trc II :
d2 = (mm)
d2 = 55 mm
T bng 10.2(TKI_tr189) chn s b chiu rng ln b0 = 29 mm
3.Vi trc III :
d3 = (mm) chn d3 = 80 mm
T bng 10.2(TKI_tr189) chn s b chiu rng ln b0 = 39 mm
IV.Xc nh khong cch gia cc gi v im t lc : Chiu di moay bnh ai :
lm = (1,21,5)d1
= (1,21,5).35 = 4252,5 mm
lm = 65 mm
Chiu di moay bnh rng 1,2 c k n chiu rng bnh rng :
b = 60,9 mm => lm1,2 = 65 mm
Chiu di moay bnh rng 3,4 c k n chiu rng bnh rng :
b = 67,5 mm => lm3,4 = 80 mm
T bng 10.3(TKI_tr189)chn : - k1 : khong cch t mt mt ca ch tit quay n thnh trong ca hp hoc gia cc chi tit quay . k1 = 10 mm- k2 : khong cch t mt mt ca n thnh trong ca hp . k2 = 8 mm- k3 : khong cch t mt mt ca chi tit quay n np . k3 = 15 mm
- hn chiu cao np v u bulng . hn = 15 mm
T bng 10.4(TKI_tr191) ta c :
l22 = 0,5.(lm22 +b0) + k1 + k2 = 0,5.(65+29) + 10 + 8 = 65 mml23 = l22 + 0,5(lm22 + lm23) + k1 = 65 + 0,5.(65 +80) + 10 = 147,5 mm
l21 = lm22 + lm23 + 3.k1 + 2.k2 + b0 = 65 +80 +3.10 + 2.8 + 29 = 220 mm
Chiu di moay na khp ni :
Chn ni trc vng n hi
lmk = (1,4 2,5).d = (1,4 2,5).80 = 142 200 mm
Khong cch cng xn trn trc I :
lc12 = 0,5.(lm + b0) + k3 + hn = 0,5.(65 + 29) + 15 + 15 = 119,5 mm
Nh vy khong cch gia cc gi trc :
l11 = l21 = l31 = 220 mm
1.THIT K TRC I
1.1.Xc nh cc khong cch gia cc gi v im dt lc :
Ta c : l12 = l22 = 65 mm ; l11 = 220 mm
lc12 = 77 mmT chng 2 _ Thit k cc b truyn _ ta c : Lc tc dng ln trc ca b truyn ai : Fr = 1263,37 N
Vi gc nghing ca b truyn ngoi = 300
Frx = Fr . sin = 1263,37.sin300 = 631,69 N
Fry = Fr.cos = 1263,37.cos300 = 1094,11 N
Hnh 5
Hnh 6
Lc tc dng t b truyn cp nhanh_bnh tr rng thng ln trc : Lc vng : Ft = 3206,69 N => Ft1 = Ft2 = 3206,69 N Lc hng tm : Fr = 1191,28 N => Fr1 = Fr2 = 1191,28 N 1.2.Xc nh phn lc ti gi : Xt trc I :
Hnh 7
(1)
(2)
(2) => R2x = == -1406,48 (N)
(1) => R1x = - Ft1 + Fsin R2x = -3206,69+631,69 (-1406,48) = -1168,52 (N)
R2y =
R2y = (N)
R1y = Fr1 Fd.cos R2y = 1191,28 1094,11 (- 637,74) = 734,91 (N)1.3.V biu mmen :
Ta c :
Fr1.(l11 l12) = 1191,28.(220-65) = 184648,4 (Nmm)
Fy.lc12 = 1094,11.77 = 84246,47 (Nmm)
Ft1.(l11 l12) = 3206,69.(220 - 65) = 497036,95 (Nmm)
Fx.lc12 = 631,69.77 = 48640,13 (Nmm)
Ft1. = 3206,69. = 125429,68 (Nmm)
1.4.Tnh chnh xc ng knh trc : Mmen un tng ti v tr lp bnh rng 1 :
Mbr1 = (Nmm)Mmen tng ng ti ch lp bnh rng 1 :
Mt = (Nmm)
ng knh trc ti v tr lp bnh rng 1 :
dbr1 =
vi tra trong bng 10.5 (TKI_tr195) l 59,75 MPa
dbr1 =
chn dbr1 = 45 mm theo tiu chun
Momen un tng ti v tr lp ln :
Mol = (Nmm)
Mmen tng ng ti v tr lp ln :
Mt = (Nmm)
Hnh 8ng knh trc ti v tr lp ln :
dol = =
chn ng knh ch lp ln : dol = 40 mm
Mmen tng ng ti ch lp bnh ai :
Mt = (Nmm)
ng knh trc ti v tr lp bnh rng 1 :
dbr1 = = (mm)chn ng knh ch lp bnh ai :
db = 32 mm
1.5.Kim nghim trc v bn mi :Chn lp ghp : Cc ln lp trn trc theo k6 , lp bnh rng , bnh dai , ni trc theo k6 , kt hp vi lp then.
1.5.1.Xt ti v tr lp bnh rng 1 : T bng 9.1 (TKI_tr173) chn :
b h = 14 9
t1 = 5,5
t2 = 3,8
W = (mm4)W0 = (mm4)
T bng 10.8 (TKI_tr194) chn Kx = 1,06
T bng 10.9 (TKI_tr197) chn Ky = 1
T bng 10.12 (TKI_tr199) chn
T bng 15.2 (TLI_tr56) tra h s kch thc
T bng 10.7 (TKI_tr197) ta c :
=>
T bng 10.11 (TKI_tr198) vi kiu lp chn
;
=2,12 (v Ky = 1)
=1,7
Mmen un tng ti v tr lp bnh rng 1 :
Mbr1 = 530227,08 Nmm
ng sut un :
ng sut xon :
Ta c :
=>
1.5.2.Xt ti tit din lp ln :Mmen un tng ti v tr lp ln : Mol = 90266,51 (Nmm)
ng sut un :
(MPa)
ng sut xon :
(MPa)
T bng 15.2 (TLI_tr56) :
=>
=>
Ta c :
EMBED Equation.DSMT4
=>
1.6.Chn then :
1.6.1.Ti v tr lp bnh rng 1 :Chn then bh=149
t1 = 5,5
lt = (0,80,9)lm = (0,80,9).65 = 52,5 58,5
chn lt = 56 mm
T = 125429,68 Nmm
1.6.2.Ti v tr lp bnh ai :
Chn then
b h = 10 8
t1 = 5
lt = (0,8 0,9).65 => lt = 55 mm
=>
2.THIT K TRC II2.1.Xc nh cc khong cch gia cc gi v im dt lc :
Ta c : l22 = 65 mm ; l23 = 147,5 mm ; l21 = 220 mmT chng 2 _ Thit k cc b truyn _ ta c : Lc tc dng t b truyn cp nhanh_bnh tr rng thng ln trc : Lc vng : Ft = 3206,69 N => Ft1 = Ft2 = 3206,69 N Lc hng tm : Fr = 1191,28 N => Fr1 = Fr2 = 1191,28 N Lc tc dng t b truyn cp chm_bnh tr rng nghing ln trc :
Lc vng : Ft3 = 8919,57 N
Lc hng tm : Fr3 = 3346,86 N
Lc dc trc : Fa3 = 2101,92 N2.2.Xc nh phn lc ti gi : Xt trc II :
Hnh 9
(1)
(2)
(2) => R2x = == 5198,66 (N)
(1) => R1x = Ft2 + Ft3 R2x = 3206,69 + 8919,57 5198,66 = 6927,6 (N)
R2y =
R2y = (N)
R1y = Fr3 Fr2 R2y = 3346,86 1191,28 (- 309,62) = 2465,2 (N)
2.3.V biu mmen :
Ta c :
Fr3.(l21 l23) = 3346,86.(220-147,5) = 242647,35 (Nmm)
Fa3. = 2101,92. = 126115,2 (Nmm)
Fr2.l22 = 1191,28.65 = 77433,2 (Nmm)
Ft3.(l21 l23) = 8919,57.(220-147,5) = 646668,83 (Nmm)
Ft3. = 8919,57. = 535174,2 (Nmm)
2.4.Tnh chnh xc ng knh trc : Mmen un tng ti v tr lp bnh rng 3 :
Mbr3 = (Nmm)
Mmen tng ng ti ch lp bnh rng 3 :
Mt = (Nmm)
ng knh trc ti v tr lp bnh rng 3 :
dbr3 =
vi tra trong bng 10.5 (TKI_tr195) l 49,8 MPa
dbr3 =
chn dbr3 = 55 mm theo tiu chun
Momen un tng ti v tr lp bnh rng 2 :
Mbr2 = (Nmm)
Mmen tng ng ti v tr lp bnh rng 2 :
Mt = (Nmm)
Hnh 10ng knh trc ti v tr lp bnh rng 2 :
dbr2 = =
chn ng knh ch lp bnh rng 2 : dbr2 = 55 mm
=> ng knh ti v tr lp ln : dol = 50 mm2.5.Kim nghim trc v bn mi :Chn lp ghp : Cc ln lp trn trc theo k6 , lp bnh rng , bnh dai , ni trc theo k6 , kt hp vi lp then.
2.5.1.Xt ti v tr lp bnh rng 3 : T bng 9.1 (TKI_tr173) chn :
b h = 16 10t1 = 6t2 = 4,3W = (mm4)
W0 = (mm4)
T bng 10.8 (TKI_tr194) chn Kx = 1,06
T bng 10.9 (TKI_tr197) chn Ky = 1
T bng 10.12 (TKI_tr199) chn
T bng 15.2 (TLI_tr56) tra h s kch thc
=>
T bng 10.11 (TKI_tr198) vi kiu lp chn
;
=2,26 (v Ky = 1)
=2,09Mmen un tng ti v tr lp bnh rng 3 :
Mbr3 = 690694,08 Nmm
ng sut un :
ng sut xon :
Ta c :
=>
2.5.2.Xt ti tit din lp bnh rng 2 :T bng 9.1 (TKI_tr173) chn :
b h = 16 10
t1 = 6
t2 = 4,3
W = (mm4)
W0 = (mm4)
T bng 10.8 (TKI_tr194) chn Kx = 1,06
T bng 10.9 (TKI_tr197) chn Ky = 1
T bng 10.12 (TKI_tr199) chn
T bng 15.2 (TLI_tr56) tra h s kch thc
=>
T bng 10.11 (TKI_tr198) vi kiu lp chn
;
=2,26 (v Ky = 1)
=2,09
Mmen un tng ti v tr lp bnh rng 2 :
Mbr3 = 222353,29 Nmm
ng sut un :
ng sut xon :
Ta c :
=>
2.6.Chn then :
2.6.1.Ti v tr lp bnh rng 2 :Chn then bh=1610
t1 = 6
lt = (0,80,9)lm = (0,80,9).65 = 52,5 58,5
chn lt = 56 mm
T = 535174,2 Nmm
2.6.2.Ti v tr lp bnh rng 3 :
Chn then
b h = 16 10t1 = 6lt = (0,8 0,9).80 => lt = 70 mm
=>
3.THIT K TRC III3.1.Xc nh cc khong cch gia cc gi v im dt lc :
Ta c : l32 = l23 = 147,5 mm ; l33 = l31 + lc33 = 220 + 119,5 = 339,5 mmT chng 2 _ Thit k cc b truyn _ ta c :
Lc tc dng t b truyn cp chm_bnh tr rng nghing ln trc :
Lc vng : Ft4 = 8919,57 N
Lc hng tm : Fr4 = 3346,86 N
Lc dc trc : Fa4 = 2101,92 N
Chn khp ni trc vng n hi theo mmen xon T3 = 1455,05 Nm
T bng 16.10a (TK2_tr69) c :
d = 63 mm
D0 = 200 mm
l1 = 48 mm
D = 260 mm
z = 8
D3 = 48 mm
l = 140 mm
nmax = 2300 mm
l2 = 48 mm
d1 = 110 mm
B = 8 mm
B1 = 70 mm
T bng 16.10a (TK2_tr69) c kch thc c bn ca vng n hi
d0 = 24 mm
l1 = 52 mm
d1 = M16
l2 = 24 mm
D2 = 32 mm
l3 = 44 mm
l = 95 mm
Lc t khp ni tc dng ln trc :
Fk = (N)3.2.Xc nh phn lc ti gi :
Hnh 11Xt trc III :
(1)
(2)(2) => R2x = =- =-5310,48 (N)(1) => R1x = -Ft4 + Fk R2x = -8919,57 + 4365,16 (- 5310,48)= 756,07 (N)
=> R2y =-
R2y =- (N)R1y = Fr4 R2y = - 3346,86 + 2679,38 = - 667,48 (N)3.3.V biu mmen :Ta c :Fr4.(l31 l32) = 3346,86.(220-147,5) = 242647,35 (Nmm)Fa4. = 2101,92. = 346816,8 (Nmm)Fk.lc33 = 4365,16.119,5 = 521636,62 (Nmm)Ft4.l32 = 8919,57.147,5 = 1315636,57 (Nmm)Ft4. = 8919,57. = 1455053,33 (Nmm)2.4.Tnh chnh xc ng knh trc : Mmen un tng ti v tr lp bnh rng 4 :Mbr4 = (Nmm)Mmen tng ng ti ch lp bnh rng 3 : Mt = (Nmm)ng knh trc ti v tr lp bnh rng 1 : dbr4 =
vi tra trong bng 10.5 (TKI_tr195) l 48,8 MPadbr4 =
chn dbr4 = 70 mm theo tiu chun Momen un tng ti v tr lp ln :Mol = (Nmm)Mmen tng ng ti v tr lp ln :Mt = (Nmm)ng knh trc ti v tr lp ln : dol = =
chn ng knh ch lp ln : dol = 65 mmMmen tng ng ti v tr lp khp ni :
Mt = .T = .1455053,33 = 1260113,15 (Nmm)
ng knh ti v tr lp khp ni :.
Hnh 12
dk = (mm)
chn dk = 60 mm theo tiu chun3.5.Kim nghim trc v bn mi :Chn lp ghp : Cc ln lp trn trc theo k6 , lp bnh rng , bnh dai , ni trc theo k6 , kt hp vi lp then.3.5.1.Xt ti v tr lp bnh rng 4 : T bng 9.1 (TKI_tr173) chn :b h = 20 12t1 = 7,5t2 = 4,9W = (mm4)W0 = (mm4)T bng 10.8 (TKI_tr194) chn Kx = 1,06T bng 10.9 (TKI_tr197) chn Ky = 1T bng 10.12 (TKI_tr199) chn
T bng 15.2 (TLI_tr56) tra h s kch thc
=>
T bng 10.11 (TKI_tr198) vi kiu lp chn
;
=2,38 (v Ky = 1)
=2,09Mmen un tng ti v tr lp bnh rng 4 :Mbr4 = 1337825,59 Nmmng sut un :
ng sut xon :
Ta c :
=>
3.5.2.Xt ti tit din lp ln :T bng 10.8 (TKI_tr194) chn Kx = 1,06T bng 10.9 (TKI_tr197) chn Ky = 1T bng 10.12 (TKI_tr199) chn
T bng 15.2 (TLI_tr56) tra h s kch thc
=>
T bng 10.11 (TKI_tr198) vi kiu lp chn
;
=2,34 (v Ky = 1)
=2,09Mmen un tng ti v tr lp ln:Mol= 521636,62 (Nmm)ng sut un :
(MPa)ng sut xon :
(MPa)Ta c :
EMBED Equation.DSMT4
=>
3.6.Chn then :
3.6.1.Ti v tr lp bnh rng 4 :Chn then bh=2012
t1 = 7,5
lt = (0,80,9)lm
chn lt = 70 mm
T = 1455053,33 Nmm
chn 2 then. Khi : =0,75.131,48=98,61
2.6.2.Ti v tr lp khp ni :
Chn then
b h = 18 11t1 = 7lt = (0,8 0,9).140 => lt = 125 mm
=>
Chng IV : CHN LN. 1.Chn ln cho trc vo ca hp gim tc:(TrcI)1.1.Chn loi :Xt t s Fa/Fr : ta thy t s Fa/Fr = 0 v Fa = 0, tc l khng c lc dc trc nn ta chn loi l bi mt dy, c s b tr nh sau:
Hnh13 Da vo ng knh ngng trc d1A =d1B = 40 mm, tra bng P2.7[TKI_tr255] chn loi bi c nh c k hiu : 208 ng knh trong d = 40mm, ng knh ngoi D = 80 mm
Kh nng ti ng C = 25,6 kN, kh nng ti tnh Co = 18,1 kN;
B =18(mm) r = 2,0 (mm)
ng knh bi db = 12,7 (mm)1.2. Kh nng ti ng:
Phn lc tng trn hai :
Fr1=
Fr2=
Ta kim nghim chu ti ln hn, Fr 2 =1544,31 (N)
Theo CT11.3[TK1] vi Fa = 0 , ti trng qui c :
QII = X.V.Fr2.kt.k
i vi chu lc hng tm X= 1
V =1 khi vng trong quay
kt = 1 v (nhit t (( 100oC )
k = 1,3 ,ti trng va p va.( QII = 1.1.1544,31.1.1,3 = 2007,6 (N)
Do ti trng thay i nn ta c ti trng tng ng :
QE= = Q1
Trong , Q1=QII=2007,6 N , m=3 i vi bi.
( QE= 2007,6.= 1826,96 N
Theo ct11.1[TK1], Kh nng ti ng :
Vi L=60.n1.Lh/106=60.485.19000/106=552,9 triu vng
( Cd=QE.=1826,96. =14,995 kN1.3. Kim tra kh nng ti tnh ca .Ti trng tnh ton theo ct 11.19[TK1] vi Fa = 0 :
Qt = X0.Fr2 Vi X0 = 0,6 (tra bng 11.6[TLI_tr104])
Qt = 0,6.1544,31 = 926,59 (N) Theo ct11.20[TK1] th Qt = Fr2=1544,31 (N)
Chn Qt = 1,54431 kN kim tra v gi tr ln hn.
Ta thy : Qt = 1,54431 kN < C0 = 18,1 kN.
( kh nng ti tnh ca c m bo.
2 .Chn ln cho trc trung gian ca hp gim tc.(Trc II)
2.1.Chn loi
Xt t s Fa/Fr : Fa=Fat=2101,92 N hng t D ti C C : Fr1== = 7353,15 N
suy ra: Fa/Fr =2101,92/7353,15 =0,3 D : Fr2== =5207,87 N
suy ra: Fa/Fr =2101,92/5207,87 = 0,40
;
Vy ta dng bi d chn . Da vo ng knh ngng trc d = 45 mm,
tra bng P2.12 (TKI_tr263) chn loi bi -chn c trung hp 46310 c cc thng s
ng knh trong d = 50 mm, ng knh ngoi D =110 mm
Kh nng ti ng C = 56,03 kN, kh nng ti tnh Co =44,8 kN;
B =27(mm) , r =3,0 (mm) , r1 =1,5 (mm)
S b tr kiu O
Hnh14 Kim nghim kh nng ti : tin hnh kim nghim cho C v ny chu lc ln hn2.2. Kh nng ti ng:
Theo ct 11.3[TK1] , ti trng qui c :
Q =( X.V.Fr+Y.Fa).kt.k y lc dc trc Fa bao gm lc dc trc ngoi v lc dc trc Fs do lc hng tm sinh ra
Fs=e.Fr( bi chn), chn =260t bng 17.1 (TLI_tr101) e=0,68FsC=e.FrC =0,68. 7353,15=5000,14 NFsD=e.FrD =0,68. 5207,87=3541,35 N
= FsD+ Fa = 3541,35+2101,92=5643,27 > FsC suy ra FaC = 5643,27 N
= FsC - Fa =5000,14 2101,92 =2898,22 > FsD suy ra FaD = 2898,22 N
V =1 khi vng trong quay FaC/FrC=5643,27/7353,15=0,76 >e
T bng 17.1 (TLI_tr101) c X1 = 0,41 ; Y1 = 0,87Tra bng cc h s c:
kt = 1 v (nhit t (( 100oC )
k = 1,3;
QC = (0,41.1.7353,15+0,87.5643,27).1.1,3=10301,77N
Theo ct 11.1 Kh nng ti ng :
Tui th ca bi (m=3):
L=lh..60.n2/10=19000.60.110,28 /10=125,72 (triu vng)
Ti trng tng ng
QE= 10301,77.[]1/3= 9374,83 N
H s kh nng ti ng : Cd = 9374,83. = 46963,98 N=46,96 kN
Do Cd = 46,96 kN < C = 56,03 kN ( loi ln chn m bo kh nng ti ng.2.3. Kim nghim kh nng ti tnh.
Ti trng tnh ton theo ct11.19[TK1] :
Qt = X0.Fr+Y0.Fa Tra bng 11.6[1] : X0=0,5 , Y0=0,37
( Qt=0,5.7353,15+0,37.5643,27=5764,58 N
Theo 11.20[TK1] : Qt= Fr=7353,27 N
Chn Qt = 7353,27 N kim tra v gi tr ln hn. Ta thy Qt = 7,35 kN < C0 =44,8 kN.
( loi ln ny tho mn kh nng ti tnh.
3. Chn ln cho trc ra ca hp gim tc:(Trc III)3.1.Chn loi :-V trn u ra c lp ni trc vng n hi nn cn chn chiu ca Fkx ngc vi chiu dng khi tnh trc tc l cng chiu vi lc Ft4. Khi phn lc trong mt phng xoz :
R2x=(Fklc33-Ft4.(l31-l32))/l31=(4365,16.119,5-8919,57.(220-147,5))/220=-568,33 NR1x = -(R2x+Fk+Ft4)=-(-568,33+4365,16+8919,57)=-12716,4 (N)Xt t s Fa/Fr : Fa=Fat=2101,92 N hng t 1 ti 2 1 : Fr1== =12733,85 N
suy ra: Fa/Fr =2101,92/12733,85 = 0,17 2 : Fr2== =2738,99 Nsuy ra: Fa/Fr =2101,92/2738,99 = 0,77
;
Vy ta dng bi chn 1 dy . Da vo ng knh ngng trc d = 65 mm,
tra bng P2.12 chn loi chn c trung hp 46313 c cc thng s
ng knh trong d = 65 mm, ng knh ngoi D =140 mm
Kh nng ti ng C = 89,0 kN, kh nng ti tnh Co =76,4 kN;
B =33 (mm) S b tr
Hnh15 Kim nghim kh nng ti : tin hnh kim nghim cho 1 v ny chu lc ln hn.3.2.Kim nghim kh nng ti :
3.2.1. Kh nng ti ng:
Theo ct11.3[TK1],ti trng quy c :
QI = (X1.V.Fr1+Y1.Fa1).kt.kTrong :
V =1 khi vng trong quay
kt = 1 v (nhit t (( 100oC )
k = 1,3 , ti trng va p va.
Ta c :chn gc tip xc = 26.0 ta c e=0,68T ta c :
Fs1 = e.Fr1 = 0,68.12733,85 = 8659,02 (N)
Fs2 = e.Fr2 = 0,68.2738,99 = 1862,51 (N)
Ta c :
Fa1 = Fs2 Fat = 1862,51 2101,92 = - 239,41 < 0
Fa2 = Fs1 + Fat = 8659,02 + 2101,92 = 10760,94 (N)
X1 = 1 ; Y1 = 0Do : QI = 1. 1. 12733,85.1.1,3 = 16554,01 (N)
Do ti trng thay i nn ta c ti trng tng ng :
QE= = Q1
Trong , Q1= 16554,01 N , m=3 i vi bi.
( QE=16554,01.= 15064,51 N
Theo ct11.1[TK1], kh nng ti ng :
Tui th ca ln :
L = 60.n3.Lh/106 = 60.39,38.19000/ 106 = 44,89 triu vng
H s kh nng ti ng : Cd =6,29634. = 53,54 kN.
Do Cd =53,54 kN < C = 89,0 kN ( loi ln chn m bo kh nng ti ng.
3.2.2. Kim nghim kh nng ti tnh.
Ti trng tnh ton theo ct11.19[TK1], Qt = X0.Fr1+Y0.Fa1Vi X0 = 0,5; Y0=0,37 (tra bng 17.4 (TKI_tr104))
Qt = 0,5. 12733,85+0,37. 1862,51 = 7056,05 (N)
Theo ct11.20[1] th Qt = Fr1 = 12733,85(N)
( chn Qt=12,73 kN kim tra.
Ta thy Qt=12,73kN < C0=76,4 kN ( loi ln ny tho mn kh nng ti tnh.
chng V.Thit k v hp gim tc, bI trn
v Iu chnh n khp.
1.Tnh kt cu ca v hp:
Ch tiu ca v hp gim tc l cng cao v khi lng nh. Chn vt liu c hp gim tc l gang xm c k hiu GX 15-32.
Chn b mt ghp np v thn i qua tm trc .
Cc kch thc c bn c trnh by trong bng2.
2. Bi trn trong hp gim tc:
2.1.Bi trn bnh rng
Do vn tc vng ca cp nhanh v1=1,986 m/s 0,04.a+10 = 0,04.225 + 10 =19 ( d1 = M20d2 = 0,8.d1 = 0,8. 20 = M16
d3 = (0,8( 0,9).d2 ( d3 = M14d4 = (0,6 ( 0,7).d2 ( d4 = M10d5 =( 0,5 ( 0,6).d2 ( d5 = M8
Mt bch ghp np v thn:
Chiu dy bch thn hp, S3Chiu dy bch np hp, S4B rng bch np hp, K3S3 =(1,4 ( 1,8) d3 , chn S3 = 25mm
S4 = ( 0,9 ( 1) S3 = 25 mm
K3 = K2 ( 3(5 ) mm = 50 5 = 45 mm
Kch thc gi trc:
ng knh ngoi v tm l vt, D3, D2B rng mt ghp bulng cnh : K2
Tm l bulng cnh : E2
k l khong cch t tm bulng n mp l
Chiu cao hnh theo kch thc np
K2 = E2 + R2 + (3(5) mm = 25,6 + 20,8 + 4 = 50,4 mm
E2= 1,6.d2 = 1,6 . 16 = 25,6 mm.R2 = 1,3 . d2 = 1,3. 16 = 20,8 mm
k ( 1,2.d2 =19,2( k = 20 mm
h: ph thuc tm l bulng v kch thc mt ta
Mt hp:
Chiu dy: Khi khng c phn li S1
B rng mt hp, K1 v qS1 = (1,3 ( 1,5) d1 ( S1 = 30 mm
K1 ( 3.d1 ( 3.20 = 60 mm
q = K1 + 2( = 60 + 2.10 = 80 mm;
Khe h gia cc chi tit:
Gia bnh rng vi thnh trong hp
Gia nh bnh rng ln vi y hp
Gia mt bn cc bnh rng vi nhau. ( ( (1 ( 1,2) ( ( ( = 10 mm
(1 ( (3 ( 5) ( ( (1 = 30 mm
(2 ( ( = 10 mm
S lng bulng nn ZZ = ( L + B ) / ( 200 ( 300) ( 718,06 / 200(300 = 4,9(3,27 Z= 6
4. Kt cu bnh rng, np , cc lt ...Vt liu bnh rng bng thp, quy m sn xut nh, n chic. Dng phng php dp to phi. Bnh rng ln c ch to lm dng nan hoa gia kt hp vi c l gim khi lng bnh rng v d dng trong vn chuyn cng nh kp cht khi gia cng. Ti cc cnh rng c vt mp trnh tp trung ng sut. Cc kch thc c th chn nh sau :
= ( 2,5 ~ 4 ) m > 8 ~ 10 mm
h s nh dng cho bnh rng c kch thc ln
l = ( 0,8 ~ 1,8 ) d
h s nh dng i vi mi ghp cht, h s ln dng vi mi ghp di ng
D = ( 1,5 ~1,8 ) d trong h s nh dng vi bnh rng ch to bng thp v s dng lp ghp c di.
C = ( 0,2 ~ 0,3 )b
do = ( 12 ~ 25 ) mm , c 4 n 6 l
Np c ch to bng gang GX15-32. Trong HGT ny ta s dng 2 kiu np . Kiu 1 np c l thng cho trc xuyn qua, Mt np phnh ra to b dy khot rnh lp vng pht. Phn lp vo l hp c ch to vi dc nh d c, on g tip xc vi thnh l hp khng yu cu ln khong 3 ~ 4 mm dng nh tm np . Kiu np 2 tng t nh kiu 1 nhng khng c l xuyn thng qua. Mt np lm vo nhm gim bt kch thc np . Chiu dy bch np c 2 kiu trn ly bng 0,7 ~ 0,8 chiu dy thnh np .
5. Cc chi tit ph ca Hp gim tc
- Nt tho du : Sau mt thi vic, du bi trn cha trong hp b bn, hoc b bin cht, do cn phi thay du mi. tho du c, y hp c l tho du. Lc lm vic, l c bt kn bng nt tho du. Kt cu v kch thc nt tho du tra bng 18-7
Hnh 16 Que thm du : Dng kim tra mc du trong hp. C nhiu dng kim tra mc du, ta chn que thm du c kt cu nh hnh v
Hnh 17 Nt thng hi : Khi lm vic, nhit trong hp tng ln. gim p sut v iu ho khng kh bn trong v bn ngoi hp, ta s dng nt thng hi. Nt thng hi c lp trn np ca thm. Kt cu v kch thc nt thng hi chn theo bng 18-6 nh hnh v
Hnh 18 chng VI. Lp ghp v dung sai
1.Chn kiu lp u tin s dng h thng l v khi c th tit kim c chi ph gia cng nh gim bt c s lng dng c ct v dng c kim tra khi gia cng l .
Kiu lp phi hp trn bn v : lp np ln ln v H7/d11 ;lp bc chn gia bnh rng v ln H7/h6 ; lp bng rng ln trc H7/k6
thun tin khi lp ln ta chn kiu lp ln ln trc k6 ; kiu lp ln ln v hp H7, cho c ba cp .
Sai lch gii hn ca kch thc then theo chiu rng b - h9
Sai lch gii hn ca rnh then trn trc , ghp trung gian - N9
2 . Dung sai
lp ghp vng trong ln trc v vng ngoi ln v ,ngi ta s dng cc min dung sai tiu chun ca trc v l theo TCVN 2245-7 phi hp vi cc min dung sai ca cc vng . Bng6.Thng k cc kiu lp v tr s ca sai lch gii hn ca cc kiu lp
V trKiu lpSai lch gii hn
ca trc(m)Sai lch gii hnca l(m)
TrcI bnh rng45H7/k6
Trc II-bnh rng50H7/k6
55H7/k6
TrcIII-bnh rng70H7/k6
Bc chn-trcI30D11/k6
Bc chn-trc II 45D11/k6
Bc chn -trcIII65D11/k6
L hp ln
Trc I62H7
L hp ln
Trc II 85H7
L hp ln
Trc III100H7
Trc I - ln 30k6
Trc II - ln45k6
Trc III - ln65k6
Bnh ai-trcI28H7/h6
Khp ni-trcIII63H7/h6
L hp np
Trc I62H7/d11
L hp np
Trc II85H7/d11
L hp np
Trc III100H7/d11
Then trc Ib=14,b=10N9/h9h9 N9
Then trcIIb=16N9/h9h9 N9
Then trc III
b=20,b=18N9/h9h9
N9
Ti liu tham kho.
[TK1] - Trnh Cht, L Vn Uyn Tnh ton thit k h dn ng c kh, tp 1 Nh xut bn Gio Dc. H Ni 2001.
[TK2] - Trnh Cht, L Vn Uyn Tnh ton thit k h dn ng c kh, tp 2 Nh xut bn Gio Dc. H Ni 2001.
[TL2] Ninh c Tn Dung sai v lp ghp. Nxb Gio Dc. H Ni 2004.
[TL1] - Nguyn Trng HipChi tit my, tp 1, 2. NxbGioDc.H Ni 1994.[TK]- Nguyn Trng Hip,Nguyn Vn Lm-Thit k chi tit my .Nxb Gio Dc.H N 2003 Ht
tmm
t2
t1
tck
T2
T1
Tmm
PAGE 32Nguyn V Bnh Lp C in t 2_K49
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