v) Ensiz ponasim on tasm alar uzatm alar uchun
[ P ] - [ P 0
} - c a -c L - c u/ c p
kVt
bunda:
Ca
= 0.91;
CL
= L/L0=518/1600 = 0.32 boTganda
CL
= 0.91;
Cy=
1.12;
=
1.1 (23.2-jadval)
P0 =
0.95
k
B
t
natijada, {?] = 0.95« 0.91 * 0.91 * 1.12/1.1 = 0.8
k
B
t
12.
T asm alar yoki tasmadagi ariqchalar soni
a) N orm al kesimli ponasim on tasmali uzatm alar tasm alar soni
2 =
^
IFol ' Q
bunda:
Рг
uzatilayotgan quvvat;
[p0]-buta
tasma
y ordam ida uzatiladigan
quvvat;
Q
-tasmalar soni, tasmalar o ‘rtasida yuklanishning notekis
taqsimlanishini hisobga oluvchi koeffitsiyent
Z
=
= 3,87 =
3.39
yaxlitlab
Z
= 4 qabul
qilamiz
1P»]-Cz
1.2 '0.95
J
n
n
b) Y arim ponasim on tasmalarda ariqchalar soni
Z
= т-у— =
*'8/
~ = 15.69 yaxlitlab Z = 16 qabul qilamiz
IP
q
J’Q
0.29*0.80
v) Ensiz tasm alar soni
Z =
7
-
7
—
=
7— = 5.69 vaxlitlab Z = 6 qabul qilamiz
|Pt3-C2
0.e-S.85
J
I
T
13.
Shkivlarning eni
a) N orm al kesimli ponasimon tasm alar uchun
В = { Z - \)t + 2 f
= (4-1)3.3 + 2-10 = 30
Z=4,
f=10, t=3.3;
b) Y arim
ponasim on tasmalar uchun
В - ( Z -
\)t
+ 2 f
= (16-1)1.0 + 2 -
3.5
= 17.0
Z=16,
f=3.5, t= l .0;
v) Ensiz ponasim on tasm alar uchun
B = ( Z - l ) t + 2 f
= (6 — 1) - 2.5 + 2 *8 = 28.S
Z=6,
f=8.0, t=2.5;
14.
Tasmali uzatm alarda boshlang‘ich taranglik kuch
a) Norm al kesimli ponasim on tasmalar uchun
P, С
Fc = 7 5 0 j £ T + Z - q v - H,
bunda: f, -u za tila y o tg a n quvvat, kVt;
Cp, C
a-qiymatlari yuqorida
berilgan;
V
—tasm aning tezligi,м /с;
Z
- t a s m a l a r soni;
q
- 1 m tasmaning
massasi, кг/м;
Uzatm a uchun P, = 3.87 kVt;
Cp
= 1.1;
V
= 6.7 м/с;
Cs =
0.95;
Z
— 4;
149
www.ziyouz.com kutubxonasi
q
= 0 .1 к г /м .
N atijada,
3.87-1.1
F° =
7 5 0 6 7~ 0 9 5 + 4 ' 0 , 1 ' (6‘7)2 = 520H-
b) Y arim p o n asim o n
tasm alar uchun
3 87 • 1 1
F0 =
75 0
' + 16 • 0.009 • (6.7)2 = 530H
0
6.7-0.91
v ) E nsiz ponasim on tasm alar uchun
3 87• 11
F0
- 7 5 0 — — — — + 6 • 0.07 • (4.71 )2 - 754H
0
4.71 • G.91
15.
V alga t a ’sir qiluvchi k uchlar
a) N o rm al kesim li p onasim on
tasm ali uzatm ada
Fb =
2F0 s i n ( y ) = 2 • 520sin81°30: = 2 - 5 2 0 - 0 . 9 8 9 0 = 1028H
b) Y arim p o n asim o n kesim li tasm ali uzatm alar
Fb =
2F0 s i n ( y ) = 2 • 530sin81° = 2 « 53C • 0.9877 = 1047H
v) E nsiz kesim li p onasim on tasm ali uzatm alar
Fb - 2F0 s m ( ap - 2 ■
7 5 4 3i n 7 5 ° - 2 -7 5 4 - 0 .9 6 5 9 -= 1457H
SAVOL VA TO PSH IRIQ LAR
1. P onasim on,
y arim p o n sim o n sim o n , ensiz tasm alarn in g tuzilishi.
2. N orm al p onasim on tasm a turlarini bir-biridan farqi.
3. Y arim p o nasim on tasm a turlari v a bir-biridan farqi.
4. E nsiz pon asim o n tasm a turlari va bir-biridan farqi.
5. T asm a turlari qanday tan lan ad i?
6. Y etaklovchi shkiv diametri qanday aniqlanadi?
7. B itta ta sm a y o rd a m id a uzatish m um kin boMgan q u v v at qanday
aniq lan ad i?
8. T asm ala r soni q ancha boMishi m um kin?
9. Val tay an c h ig a ta 's ir qiladigan kuch qiym ati qanday aniq lan ad i?
6.10-§ Tishli tasmali uzatm alar
T ishli tasm ali u zatm alam i
ustki qism i tekis boMib, ichki to m o n id a
k o ‘n d alan g kesim b o ‘yicha jo y lash g an tishlari tishli gM ldiraklar bilan
ilashadi
