Đồ án chi tiết máy thiết kế hệ dẫn động băng tải

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Lời Nói Đầu
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 
ĐỒ ÁN CHI TIẾT MÁY
ĐỀ SỐ 2: THIẾT KẾ HỆ DẪN ĐỘNG BĂNG TẢI
Thông số đầu vàoE&M2\* ]^_`aH
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PHẦN 1: CHỌN ĐỘNG CƠ ĐIỆN VÀ PHÂN PHỐI TỶ SỐ TRUYỀN
1.1.Chọn động cơ điện
1.1.1.Xác định công suất yêu cầu của trục động cơ

ct
yc
P
P
η
=

Trang 2
 
<*.K

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K

 +?=<-<0"
J?+?=#$<?
 iEj
<$
[ ]
&b
Ek

I
$.
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ol
η
^a9kk
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J?+?=#$4)3
kn
η
=
E
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
b
& & &
i ol kn d br
η η η η η η
= Π =
^a9kk
b
&a9k_&a9k`&E^a9k
ND +?=-?Q?<-<0"
1.1.2.Xác định số vòng quay của động cơ
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 
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
i j
&
dc sb ct sb
n n u=

<*.
sb d h
u u u
=
ij
<$
[ ]
&f
E
B I
$!78V+3<?+"#$
<?$b

<?<<0
h
u
=
fi)3=)j
$+3,*ij$.

sb d h
u u u
= =

b&f^E
G?<$
i j
&
dc sb ct sb
n n u
= =
__9ee&E^ea9g_i,c)j
!+3,:>?$#$"

^`gai,c)j
1.1.3.Chọn động cơ
hK

^a9kkmn

^`ga,c)
Trang 4
 

<$)00
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1.2.Phân phối tỉ số truyền
1.2.1Xác định tỉ số truyền chung của hệ thống
A*%*;<-$.
dc
n
=
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

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V+3<??#$3
1.2.2 Phân phối tỉ số truyền cho hệ





ka
  __9_e

Eb9`_
ch
u == =
!<74V+3<?#$<?<*
br
u
^f
Trang 5
 
1.3.Tính các thông số trên các trục
1.3.1.Số vòng quay
A*%*;<-$.

^kai,c)j
V+3<?h"+$<0r>?$$
G3,:>?$2#$<0 
1.3.2.Công suất
 +?=<-<0 i%;<-jK

^a9kki
mK
j
 +?=<-<0rr

 +?=<-<0r
 +?=2#$"

Trang 6
 
1.3.3.Mômen xoắn trên các trục

 AW*T<-<0r
 AW*T<-<0rr

 AW*T<-<0 

 AW*T2<-<0"
Trang 7
 
1.3.4Bảng thông số động học
 
+3c<0
" r rr  
O
b9ff
d
U =
br
U
^f
kn
U
^E
i,c)j ka _`9ff __9e_ __9ee
Kimj E9ak E9af E a9ek
iH&j EEbEg
Trang 8

 
PHẦN II: TÍNH TOÁN THIẾT KẾ BỘ TRUYỀN NGOÀI
Tính toán thiết kế bộ truyền đai dẹt:
 +3-?Q?
 +?=<-<0#
( )
E
E9ak
dc
P P kW= =
 AW*T<-<0#
( )
E
EEbEg &
dc
T T N mm= =
G3,:>?$<-<0#
( )
E
ka c
dc
n n vg ph= =
V+3<?<?$
b9ff
d
u u
= =
F.-<?*
Eea
o

β
=
&E&Chọn loại đai và tiết diện đai&
!$,$*+?&
&&Chọn đường kính hai đai
( ) ( ) ( ) ( )
b
b
E E
g9 _9f & g9 _9f EEbEg EE_9`f Efb9_ed T mm= ÷ = ÷ = ÷
!
E
d
A*-??s$78
( )
E
Efad mm=
1<$,,D3$
Trang 9
 
( )
E E
& & &Efa&ka
_9`f c
_aaaa _aaaa
d n
v m s
π π
= = =
t

( )
$W
g c
m
v m s=

⇒
U$6
( ) ( ) ( )
 E E
& & E & & E a9aEg b9ff&Efa&a9keg f`f9bed u d u d mm
ε
= − = − = =
<*.+3<78
a9aE a9a
ε
= ÷
9$!
a9aEg
ε
=
&
!
( )

fgad mm=
V+3<?2
( ) ( )

E

fga
b9bE
E Efa& E a9aEg
t
d
u
d
ε
= = =
− −
G$V+3<?
b9bE b9ff
u u&Eaav u u&Eaav b9bev
b9ff
t
u u
u
u
−
−
∆ = = =
tfv
⇒
U$6&
&b&Xác định khoảng cách trục a&
*<0
( ) ( ) ( ) ( ) ( ) ( )
E 
E9g 9a E9g 9a & Efa fga eeg EEeaa d d mm= ÷ + = ÷ + = ÷
!$^kaaij

?$
( ) ( )
 
 E
E 
fga Efa
Efa fga
& & &kaa & `g9kk
 f&  f&kaa
d d
d d
L a
a
π π
− −
+ +
= + + = + + =
Trang 10
 
P2$,*
[ ]
f&Eb
E
gk
B
$!MA*-??s!
( )
eaaL mm=
G3,:S#$$<*
( )

E s
&
( )
( )
$W
_9`f E
E
a9aaf b g
eaa
m
v
i i
s
L s
 
= = = < = ÷
 ÷
 
⇒
U$6&
wL. <-$U
 E
E
fga Efa
Eea g` & Eea g` & E_a9b` Ega
kaa
d d
a
ο
α

° ° ° ° °
− −
= − = − = >
G?<$U$6
2.4 Xác định tiết diện đai và chiều rộng bánh đai
P%$
&
&
x y
t d
F
F K
A b
δ
σ
= =
<*.
t
F
2,:
Eaaa& Eaaa&E9ak
E_E9`iHj
_9`f
t
P
F
v
= = =
d
K

+3<!&<$
f&`
xEy
gg
B
$78
E9 
d
K =
Trang 11
 
δ
?$78WLA*
E
d
δ
<$
f&e
xEy
gg
B
,4*S$,$*
+?$!
$W
E
E
x y
fa
m
d

δ
=
P*,D
E $W
E
E
&x y Efa& b9gij
fa
m
d
d
δ
δ
≤ = =
<$
f&E
xEy
gE
B
$R*S$pJzr_g,pJzr_gC .4).9?
$
b9gij
δ
=
9

Eea
Efa
d =
1<$

E 
Efad d
= ≥
 U$6
{+?=*)\)
a
x y x y
F F v
C C C
α θ
σ σ
=

a E
E
x y
K
K
d
δ
σ
= −
<*.
Trang 12
 
E
K
,

K

+3)0?,*5+?=$Q?
a
σ
,*S$
$.*.-#$<?
a
_a
β
≤
,L|?V*
<0
a
E9_i)$j
σ
⇒ =
<$
f&k
xEy
g_
B
,4
a
E9_i)$j
σ
=
$78
E

9b
k9a

k
k
=


=


a E
E
k9a&b9g
x y 9b 9a`gi)$j
Efa
K
K
d
δ
σ
= − = − =
C
α
+317;#$. 
E
α
a a a
E
E a9aabiEea j E a9aabiEea E_a9b` j a9kfC
α
α
= − − = − − =

V
C
+317;#$2X#$$<-$

E ia9aE Ej
V V
C k V= − −
P*+B0$,$*+?
a9af
V
k⇒ =

E a9afia9aE&Ea9fa Ej a&kk`
V
C = − − =
Trang 13
 
a
C
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Trang 14
 
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Trang 15
 
PHẦN 3: THIẾT KẾ BỘ TRUYỀN TRONG
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Trang 16
 
3.2 Xác định ứng suất cho phép
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Trang 17
 
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Trang 18
 
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x y 9e& $Wi 9 j 9e&fga E_ai j
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x y a9e& a9e&bfa `i j
H m ch ch
F m ch
F m ch
m MPa
MPa
MPa
σ σ σ
σ σ
σ σ
= = =



= = =


= = =

3.3 Xác định sơ bộ khoảng cách trục
( )
E
b
†

&
E &
x y & &
H
a
H ba
T K
a K u
u
β
σ ψ
= +
9,4
Trang 19
 

$

€+3)0?,D?<#$Y)<<$
[ ]
_&g
E
k_
B
 ^‚
$
^fbK$
Ecb
&

E
€*AW*T<-<0#
E
^b`E`giH&j
x~
J
yC{+?=)W(*)\)x~
J
y^faa9aEiK$j
?€‡+3<??^f
9
ba bd
ψ ψ
€J+3?<,<
<$
[ ]
_&_
E

k`
B
,4<?3W59Jptbga$!78
a9f
ba
ψ
=
a9g i Ej a9g&a9bif Ej a9`g
bd ba
u
ψ ψ
= + = + =

Jˆ
9
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_&`
xEy
ke
B
,4
a9`g
bd
ψ
=
,+"
3<%+"_$78
E9ab

E9a`
H
F
K
K
β
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=
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

=


P*,D
( )
E
b
b
†
 
&
b`Eb`&E9ab
E & fbif Ej Eg9g`i j
x y & & faa9aE &f&a9b
H
a
H ba
T K
a K u mm

u
β
σ ψ
= + = + =
!$
†
^Egij
3.4 Xác định các thông số ăn khớp
Trang 20
 
$& ?))
^ia9aE•a9aj$
†
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<$
_&e
xEy
kk
B
!A*-??s^ij&
&wL+3<
!+"ˆ^Ef
a
^‚*+ˆ^a9k`ak_
$.
a
†
E
& *+
&Eg&*+Ef

f9_
i Ej if Ej
a
Z
m u
β
= = =
+ +
9=‰
E
^g
‰

^?&‰
E
^f&f9_^k`9af9=

keZ =
‡+3<?2

E
ke
b9k
g
t
Z
u
Z
= = =
G$‡+3<?

b9k f
&Eaav &Eaav 
f
t
u u
u
u
−
−
∆ = = =
tfv*6&
&wL.-<
( )
E 
†
a
 g ke
i j
*+ a&kef
 &Eg
$< *+i *+ j $< *+ia9kefj Ea9_
m Z Z
c
a
cc c cc
β
β β
+
+
= = =

= = =
&wL.4)Š
†
a
a
†
a
$< $< a9ba
*+ a9kef
t t
tg tg
ctg ctg
c
α
α α
β
 
 
= = = =
 ÷
 ÷
 
 
Trang 21
 
F.-#$<<-/<0"+;ˆ


( )
a a a

$< *+ & $< i *+a9ba & Ea9_ j k9_f
b t
ctg c tg ctg c tg
β α β
= = =
3.5 Xác định các hệ số vầ một số thông số động học
‡+3<?2?

^b9k
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†
†E
† † †E
&
&Eg
gai j
E b9k E
& &Eg ga aai j
t
a
d mm
u
d a d mm

= = =

+ +


= − = − =



ND3<?/#$<
†E E
&
&ga&_`9ff
a9`ai c j
_aaaa _aaaa
d n
v m s
π
π
= = =
<$
_&Eb
xEy
Ea_
B
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=) %W#$<?w^k
<$)00
&b
xEy
ga
PL
,4
 w^k
 Jptbga
 ‹Œ
 N^a9`aic+j

H+??%$78
E9aE
E9ab
Hv
Fv
K
K
=


=

Trang 22
 
J+3D)<?<!
E9ab
E9a`
H
F
K
K
β
β
=



=




JŠ
9
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[ ]
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E
Ea`
B
,4
a9`i c j
w^k
v m s
CC
=


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E9Eb
E9b`
H
F
K
K
α
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=

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
=
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3.6 Kiểm nghiệm bộ truyền bánh răng
$&1,5+?=)W(
( )
E

† †E
 E
‰ ‰ x y
& &
H t
H M H H
t
T K u
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b u d
ε
σ σ
+
= ≤
x y
H
σ
C{+?=)W(*)\)
x y x y& ‰  faa9aE&a9kg&E bea9aEi j
H H R v xH
Z MPa

σ σ
= = =
‰
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xEy
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€J+31/S#$Y)W(
a
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 *+k9_f
E9`f
+i j +i&a9ba j
b
H
t
c
c
Z

β
α
= = =
Trang 23
 
‰
ε
€J+3+2<R4)#$<K0?,*+3<R4)$•
Š
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ˆ
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α
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 
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≈ − + = − + =
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m

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→ = = =
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 E &b`Eb`&E9a& b9k E
‰ ‰ `f&E9`f&a9`` bf`9ei j
& & ga&b9k&ga
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H M H
t
T K u
Z MPa
b u d
ε
σ
+ +
= = =
$.
bf`9e x y beai j
H H
MPa
σ σ
= ≤ =

Trang 24
 
[ ]
[ ]
bea9aE bf`9e
&Eaav &Eaav e9_v Eav
bea
H H
H
σ σ
σ
−
−
= = <

^‚*6
&1?3
E E
E E
† †E
E 
 
E
& & &
x y
& &
&
x y
F F
F F
F F
F F
F
T K Y Y Y
b d m
Y
Y
ε β
σ σ
σ
σ σ

= ≤





= ≤


E 
x y9x y
F F
σ σ
C{+?=?3*)\)#$#,L
E E
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x y x y& Ekg9fb&akg&E Eeg9__i j
x y x y& Eeg9Ef&a9kg&E E`g9eei j
F F R S xF
F F R S xF
Y Y K MPa
Y Y K MPa
σ σ
σ σ
= = =


= = =

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€J+3<!%,?3
& & E9b`&E9a`&E9ab E9gE
F F F Fv

K K K K
α β
= = =
q
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E E
a9__
E9gE
Y
ε
α
ε
= = =
q
ˆ
€J+31-#$<
a a
a a
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E E a9kb
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β
β
= − = − =
q
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€J+3S<K0?,*+3<7"7"‰
NE
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