МАТУРСКИ РАД Извршити прорачун ручне механичке дизалице са навојним вретеном , сврхе. Направити програм за варијантни прорачун који омогућава варира 1. Оптерећења дизалице 2.Висине подизања терета 3.Материјала навојног вретена Задатком обухватити: 1.Аналитичко решење задатка и конструкционо уобличење у складу и проверу напрезања у појединим деловима дизалице 2. Користећи CAD програмски пакет нацртати склопни цртеж дизал цртеже елемената дизалице, и то: б. Тела дизалице в. Навртке г. Навојног вретена д. Главе (држаче терета) 3. Теоријски обрадити тему. Покретни навојни спојеви Конкретни подаци: 1. Оптерећење дизалице 2. Висина подизања терета 3. Ручна сила 4. Профил завојнице 5. Материјал навртке 6. Материјал навојног вретена
F= Hmax = Fr =
16 200 150
коси P. Cu.
Č 064
Остале податке усвојити
1
Рудан Урош
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1. ПРЕДХОДНИ ПРОРАЧУН ЗАВОЈНОГ ВРЕТЕНА Потребна површина пресека језгра вретена: S 1
=
F
1 2 dc
=
340.91
mm
2
1 =
0.8
фактор с обзиром на квалитет завојнице
2 =
0.8
фактор поправке с обзиром на сложеност напо N
D ( 1) = 220
mm
N
D ( 1) = 310
T =
mm
динамичка издржљивост за Č 0645 при једнос оптерећењу на увијање
2
N
330
mm
S=
динамичка издржљивост за Č 0645 при једнос оптерећењу на затезање
2
2
Степен сигурности
3
dc =
граница развлачења
D 1
73.33333
=
S
N mm
2
Према прорачунатој вредности површине језгра усвајам трепезни на следеће карактеристике d= P= d1= d2= H1= S1=
28 5 22.5 25.5 2 398
mm mm mm mm mm mm
j=
3.58
2
Називни пречник Корак навоја Пречник језгра Средњи пречник Дубина ношења Површина пресека језгра Угао нагиба навоја, једноструког на
2. ЗАВРШНИ ПРОРАЧУН ЗАВОЈНОГ ВРЕТЕНА За усвојену завојницу је напон притиска c =
F
=
40.20101
S 1
N mm
2
а напон увијања T =
F d 2 tg j
d 1
3
2
16
=
14.67
N mm
2
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Напон савијања у вратилу f =
M f
=
F r H max c 3
d 1
W x
=
30.8668
N mm
2
32
где је : ручна сила на ручици ручици Fr = Hmax = максимална висина дизања растојање c= Напони притиска и савијања су нормални па се могу сабрати = f c =
71.06782
N mm
2
Узимајући у обзир добијени нормални напон, идеални напон има вр i =
2
dc T dt
2
=
71.826
N mm
2
3. ПРОВЕРА ВРЕТЕНА НА ИЗВИЈАЊЕ Преподставља се да је вретено на месту навртке укљештено, а на ме зблобно. Укупна дужина вретена изложена извијању је једнака виси носача терета. Висина носача терета се процењује да ће износити 30 да ће висина бити око 50 мм. l= Hmax +l1= 250
mm
па је слободна дужина извијања i=2 l1=
500
mm
виткост вретена је : =
i
=
imin
88.88889
где је најмањи пречник инерције кружног пресека imin = 0.25 d 1 =
5.62 5.625 5 mm
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Сила критичног извијања F K =
I 2 =
2 E I 2
= 5212 52122. 2.84 84 kN
i
d 1
4
=
4 12574.18 mm
64
Степен сигурности против извијања S =
F K
=
3257.677
F
Задовољава 3. ПРОРАЧУН НАВРТКЕ Потребна висина навртке Нn добија се из услова да напон површинс вретена и навртке не пређе допуштену д опуштену вредност. p =
F 1 A
H n =
=
F P
d 2 H 1 H n F P
d 2 H 1 pdoz
p doz
=
p doz = 15
33.28 33.2873 73 mm
N mm
усвајам
2
H n =
Број навојака z =
H n
=
завојака
7
P
Пречник тела навртке d N израчунава се из услова затезања, док се ут приближно, помоћно фактора 2 . При томе се предпоставља да се н преко површине S 2. Из тога произилази услов: 1 2 de =
F
d N
2
4
D 2
=
4
Одатле се добија d N =
4 F
de 1 2
D 2 = 46.34 46.3426 26 mm
Усвајам стандардну вредност
50 mm
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дебљина зида дизалице код наврте је ојачана за 2 до 3 мм. d = d 3 = 10
мм
Пречник обода навртке d NS = d N 2 d = 64
мм
Потребно је проверити притисак на површини S 2 p =
F
d NS
2
d N
4
2
=
12.7643
N mm
2
задовољава
4
Дебљина обода навртке d V = d N =
d N D 2
мм
= 11
Потребно је проверити напон смицања на ободу навртке( површина линијом) S =
F
d N d V
=
9.26
N mm
што задовољава, јер је за P. Cu. Sn. 12
2
задовољава ds = 30
4. ИЗБОР ЛЕЖИШТА
Котрљано лежиште треба да испуњава услов: C o F
Статичка носивост лежаја C o мора бити већа од радне силе коју преноси дизалица Унутрашњи пречник лежаја d u = (0,8......0,9) d = 22.4
мм
N mm
2
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Усвајам аксијални лежај 514 са статичком носивошћу носивошћу Co=33,5 kN Димензије стандардног аксијалног лежаја су: D = 60
mm
Спољашни преч
du= 25
mm
Унутрашњи преч
H = 24
mm
Висина лежаја
r=
1.5 mm
Радијус заобљењ
5. ПРОРАЧУН РУЧИЦЕ ЗА ПОДИЗАЊЕ
Момент на ручици изазван ручном силом Fr мора бити довољан д овољан да с
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Дужина ручице треба да се повећа за ширину људске шаке и полови Ls = L L L = 295 L =
DV 2
= 35
L =
40
мм
Стварна дужина
мм
Половина главе
мм
Половина људск
Пречник ручице се рачуна на основу допуштеног напона на савијањ df =
M W x
=
F R Lr
d r
нормални напон
3
32
Lr = L L L =
d r =
3
32 F R L R
df
145
мм
корисна дужина
= 14.4562 мм
Усвајам стадардни пречник ручице
16
6. ПРОВЕРА НАПОНА У ПРОШИРЕНОМ ДЕЛУ ВРЕТЕНА
Пошто је на проширеном делу вратила део ослабљен бушењем унакрсних отвора за пролаз ручице за подизање терета , потребно је проверити величину напона напона у пресеку А-А. Пречник отвора је већи за 1 мм да би ручица лако улазила
мм
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7. ПРОРАЧУН ПОСТОЉА ДИЗАЛИЦЕ Радијус заобљења се рачунају по емпириској формули r = 0,17...... 0,33
d d 1
=
2.125
мм
2
мм
2
усвајам
Висина постоља треба да буде већа од висине дизања терета, за случ у најнижи положај. H = H max 50 = 250
мм
Усвајам препоручени нагиб постоља за ливење у пешчаном калупу 1 d 5 = d N 2
1
H =
66.66667
усвајам
68
мм
102
усвајам
102
мм
d 7 = d N d =
57
усвајам
57
мм
d 8 = d 7 2 d =
71
усвајам
71
мм
d 6
=
1 .5
30 d 5
=
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Провера површинског притиска између постоља и подлоге p =
F
d 6
2
d 5
4
2
= 3.524542
N mm
2
задовољава
4
Провера постоља на притисак у пресеку I - I C =
F
d 8
2
d 7
4
2
= 11.36822
N mm
2
задовољава
4
Провера постоља на увијање у пресеку I -I T =
M d 8
16
d 8 d 7 4
= 4
0.798017
N mm
2
задовољава
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намењене за ремонтне е следећих података:
са техничким захтевима це, као и радионичке
kN mm N Sn. 12
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ског стања ерном промењивом ерном промењивом
ој Tr28x4 који има
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дност
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ог притикска између
35
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бележена изломљеном
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ик лежаја ник лежаја
а
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у пречника главе навртке учице авртке шаке
на ручици учице
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