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     TRÖÔØNG ÑAÏI HOÏC BAÙCH KHOA TP. HCM KHOA CÔ KHÍ BOÄ MOÂN THIEÁT KEÁ MAÙY 

    BAØI TAÄP LÔÙN CHI TIEÁT MAÙY 

    Sinh vieân thö! hie"n # N$%&ễn H'( ǹ$ )ũ  MSS)#*+,+-+*

    ÑEÀ TAØI

    Ñeà soá 2# THIEÁT KEÁ HEÄ THOÁNG DAN ÑOÄNG BA!NG TA"I

    P#$%&' ()& soá*+,

    He- .#oá&' /(0& 1o-&' (3&' .(45 'oà6*   /0 Ñ'"n$ !1 2ie"n - 3h( 4h'ân$ 2'5n$ 6'"7 *0 N'8i t9%! 2(:n h'5i7 -0 H'"3 $i(;< t'8! 6(=nh 9(>n$ t9% h(i !(83 4h(i ?t9ie@n7 0 B'" t9%&e5n !h '8n$ !'n D(>n7 E0 B(>n$ t(;i.

    7oá 85e-9 .#5eá. :eá* Fö! v':n$ t9eân 6(>n$ t(;i NJ# E++ )("n t'8! 6(>n$ t(;i v

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     T9! I

     T9! II

     T9! III

    Che8 2'" t(;i# T/ T 7 T*  +.T 7t/ J 7 t*  -+J

    C.TI ́ NH TOAN THIÊT KÊ TRUC 

    I. Tinh toan 3 truc c hô   p gm tc 1. Chn v  t !"  # truc!$ th%p C&' tô c th"  n

    ( )* h+n ,-n  σ b=750 MPa

    ( )* h+n ch/  σ c=450 MPa

    ( Chn 0 ,ô   2ng 0#t #n cho ph%p 456 789 :p ( ;ng 0#t  v* truc >?# v$o v$ >?# r  4@6 7 A9BA' :p ( ;ng 0#t  v* truc tr#ng gn  4@6719B1' :p

    A. ac >Dnh >EFng Ginh 0 ,ô   thHo công th2c 

     

    . Truc I v* TI 7 13198J1A3 Kmm L 4   τ ¿=20 MPa

    d1≥ 3

    √   T  I 

    0,2 [ τ  ] =

    3√136107,1230,2.20   =32,4 mm T chn thHo t"# ch#Mn  N1 73' mm

     ,. Truc II  v* TII7&AOO1JA&& Kmm L 4@67 1':p

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    d2≥  3

    √   T  II 

    0,2 [ τ  ] =

    3√ 426881,2440,2.15   =52,2mm T chn  NA 7 '' mm

    c. Truc III v* TIII 7PO1O&PJP98 Kmm L 4U67 A9 :Q

    d3≥  3

    √   T  III 

    0,2 [ τ  ] =

    3√ 981849,9070,2.20   =62,6mm T chn N37' mm

    3. ac >Dnh GhoRng cach g >S v$ >m >U  t !Vc 

    %:n$ !(=! 4&= hie"% (% 2(â • 4 V '8 thö= tö !%;( t9%! t9'n$ h'"3 $i(;< t'8! 4  /*-7 • i V '8 thö= tö !%;( tie8t ie"n t9%! t9eân 2'= !'= D(W3 !(=! !hi tie8t

    th(< $i( t9%&e5n t(;i t9'n$# i  + v(: /# !(=! tie8t ie"n t9%! D(W3 '@ i  *X v1=i  D(: '8 !hi tie8t Y%(& 6(=nh 2(i 6(=nh 9(>n$

    4h1=3 n'8i XJ

    •  V 4h'(;n$ !(=!h $iöZ( !(=! $'8i 21Z + v(: / t9eân t9%! thö= 47

    • V 4h'(;n$ !(=!h tö: $'8i 21Z + 2e8n tie8t ie"n thö= i t9eân t9%!

    thö= 47

    •  V !hie5% (:i

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      S1 2'5 tnh 4h'(;n$ !(=!h t9%! thö= * !%;( h'"3 $i(;< t'8! 6(=nh 9(>n$ t9

     T9'n$ 2'=# 0 4h'(;n$ !(=!h tö:

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    ( Ch-# N$ m/Hr ,anh rUng tru cp nhnh !mAA7 `1JAd1J'NA 7`1JAd1J'. ''7dOAJ' mm

    t chn !mAA789 mm

    ( Ch-# N$ m/Hr ,anh rUng tru cp ch  m !mA37 `1JAd1J'NA 7 `1JAd1J'. ''7dOAJ' mm t chn !mA37 8' mm

    !A1 7!mAAe3G 1e!mA3eAG Ae,9A 7 89e3.19e8'eA.19eAP7AA&mm !AA7 9J'`!mAAe,9AeG 1eG A7 9J'`89eAPe19e197 PJ' mm !A37 9J'`!mAA e !mA3 e G 1 e !AA7 9J'`89e8'e19 e PJ' 7 1'A mm

    c. Truc III `>?# r ( Ch-# N$ m/Hr ,anh rUng tru cp ch  m

    !m3A7 `1JAd1J'.N3 7 `1JAd1J'.'78OdP8J' mm

    t chn !m3A7P' mm( Ch-# N$ m/Hr c >f

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    ( Vc No Gh*p n c2ng !Vc vng tr"n Gh*p n c2ng

     F t = 2.T  I 

     Dt  =

    2 .136107,123

    90 =3024,6 N 

     T9'n$ 2'=# 0 Ñö1:n$ 4nh v':n$ t9':n Y%( t(â< !(=! !h'8t !%;( t9%! n'8i v':n$ 2(:n h'5i.

     T9( 6(;n$ /0/+( ( kch Ytinh toan thZt GZ N\n >ô  ng c Ghi(t   pA_v1=i TI  136107,123  N

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    ( Tinh mômHn tEng >Eng t+ cac tZt N"  n tr"n ch-# N$ truc

    tinh mômHn #n tng   M  $=√  M  $y 2 + M  $#

    2

    mômHn tEng >Eng  M td$=√  M  $ 2 +0,75T  $

    2

    qo > 

     M td=√  M # 2 + M y

    2 +0,75T  2=√ 52829,52+0+0,75.136107,1232=129169,7 Nmm

     M tdD=√  M  D# 2 + M  Dy

    2 +0,75T  D

    2 =√ 69800,92+1767482+0,75.136107,123 2=223620 Nmm

     M td% =√  M %# 2 + M %y

    2 +0,75T %  2=√ 0+0+0,75.136107,1232=117872,2 Nmm

    ( Tinh >EFng Ginh truc t+ cac tZt N"  n

    T c công th2c 

    d $ ≥ 3

    √   M td$ 0,1[σ ]

    Trong > 456 !$ 2ng 0#t cho ph%p c th%p chZ t+o truc

     T+ 

    d ≥ 3

    √   M td

    0,1 [ σ ]  =

    3

    √ 129169,7

    0,1.70   =26,4 mm

    Chn N7AO mm

    T+ q

    d D ≥  3

    √   M tdD

    0,1[ σ ] =

    3√ 2236200,1.70 =31,73mm Chn Nq73' mm

       F rBA

    N

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    _T(   C

    d% ≥ 3

    √   M td% 

    0,1 [ σ ] =

    3√ 117872,20,1.70   =25,6mm

    Chn NC7AO mm

    T+ s

    Chn Ns7N7 AO mm

     ,. Truc II` tr#ng gn

    ( Tinh phn !Vc tr"n cac g tV

    69800,9

    18905

     F r

    52829,5

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      T9'n$

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    (

    C  B A

     F t 

     F r

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    ( Tinh >EFng Ginh truc t+ cac tZt N"  n

    T c công th2c 

    d $ ≥ 3

    √   M td$ 0,1[σ ]

    Trong > 456 !$ 2ng 0#t cho ph%p c th%p chZ t+o truc

     T+ q

    d D ≥  3

    √   M tdD

    0,1[ σ ] =

    3√ 4613450,1.70 =40,39mm Chn N7&' mm

    T+ C

    d% ≥

    3

      M td% 

    0,1 [ σ ]=

    3

    √  474364,364

    0,1.70   =40,76mm

    Chn NC7&' mm

    T+  v$ s

    ThHo t"# ch#Mn chn Ns7N739 mm

    c. Truc III `>?# r

    ( Tinh phn !Vc !"n cac g tV

      T9'n$

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    ⟹{ Ry= − F r2 . (!31−!33)+ F r# . !c32

    ! 31

    = −1726,35 (224−152 )+8939,37.94

    224 =3196,4 N 

     R  Ay= Ry+ F r2+ F r#=3196,4+1726,35+8939,37=13862 N 

    Trong mU  t phjng

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    ( Tinh mômHn tEng >Eng t+ cac tZt N"  n tr"n ch-# N$ truc

    tinh mômHn #n tng   M  $=√  M  $y 2 + M  $#

    2

    mômHn tEng >Eng  M td$=√  M  $ 2 +0,75T  $

    2

    qo > 

     M tdA=√  M  A# 2 + M  Ay

    2 +0,75T  A 2=√ 840300,782+0+0,75.981849,9072=1195461 Nmm

     M tdD=√  M  D# 2 + M  Dy

    2 +0,75T  D

    2 =√ 4 85852,82+231734,6 42+0,75.981849,9072=1006367,

     M td% =√  M %# 2 + M %y

    2 +0,75T %  2=√ 0+0+0,75.981849,9072=850306,96 Nmm

    981849,907

    N

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    ( Tinh >EFng Ginh truc t+ cac tZt N"  n

    T c công th2c 

    d $ ≥ 3

    √   M td$ 0,1[σ ]

    Trong > 456 !$ 2ng 0#t cho ph%p c th%p chZ t+o truc

     T+ s

    d A ≥  3

    √   M tdA

    0,1 [ σ ]  =

    3√ 11954610,1.70   =55,48mm Chn Ns7'O mm

    T+ q

    d D ≥  3

    √   M tdD

    0,1[ σ ] =

    3√ 1006367,6350,1.70   =52,38mm Chn Nq7'' mm

    T+ C

    d% ≥ 3

    √   M td% 

    0,1 [σ ] =

    3√ 850306,960,1.70   =49,5mm Chn NC7'9 mm

    T+  

    ThHo t"# ch#Mn chn Ns7N7'' mm

    '. m ngh"  m truc v- >ô   ,-n m ( v  t !"  # th%p C&' tô c th"  n

    )* h+n ,-n  σ b=750 MPa

    * σ −1 7 `9J&B9J'   σ b 7 399B38' :Q L t chn σ −1=¿ 3'9 :Q

    @(1 7 `9JAAB9JA'   σ b 7 1'B1O8J' :Q L t chn @(1 7 189 :p

    ( Tr ,ng 19.O trng 3A 0ach Yc 0w thZt GZ ma/_ c tac g Kg#/ễn xy# ô  c t >Ezc h"   0 Zn t   p tr#ng t trng  5 7AJ9' :pL  @71JP

    ( x"   0 Zn nh hEwng c 2ng 0#t tr#ng ,XnhJ v* th%p cac,on m-m

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    {5 79J9' L {@ 7 9

    ( Khi t9%! Y%(& n$ 6(=nh !h 4h1=3 n'8i t9%! D(W3 the' 4ie@% 4 !'= 4e8t h13 v1=i D(W3 then. Ki