Thiết kế hệ thống truyền động xích tải phương án 14

Số liệu thiết kế : Lực vòng trên xích tải F(N): 8500 N. Vận tốc xích tải v : 0,95 ms . Số răng đĩa xích tải dẫn z : 9 răng . Bước xích tải p : 110 mm. Thời gian phục vụ L : 6 năm . Quay một chiều , làm việc 2 ca , tải quay đập nhẹ . ( 1 năm làm việc 300 ngày , 1 ca làm việc 8 h ) . Chế độ tải : T1 = T ; t1= 24 giây ; T2 = 0,85T ; t2 = 46 giây

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  9* ; .&X42YXZDN.!#W <[E! &42E"#$0" \5 2E"#$0"] => ^45 2E"#$_ #E 2T!..F45 2E"#$`#a 3<=#:5+- <[E!bX2c68d IHB@@ MPa b = σ K_ N!3%XeX c MPa-@)-fg = τ  3->6?2@64; -;+ <[c<68dgτf)8?. [ ] / - - -K@ τ T d ≥ ⇒=≥⇒           = = = IH6BK8B )8-K@ 86@@JA IMH/K)8@ IH8KJ IH86@@JA / - - - - mmd pvn kwP NmmT [ IH8A - mmd =  :!;! <=> ?::-@A@@-AB /   .0' h86@@JA⇒iB@HI %)@HI .d0$!"3.    =+= === IHB88 IHB@-@@/K@ -) )- mmbb mmab wba ψ X #d0 - 01 0aPQ 0 ) 0PQ $!"    =+= === IHL88 IHL@ 86K@ 6/ mmbb mmab wba ψ X #d0 6 01 0aPQ 0 / 0PQ    == == ⇒ IHL@ IHB@ // mmbl mmbl .d5[ % ) 4X' 01 EE]$ % ) )@HI % - 4X'  j.-01 % - )@HI \&=P[2  :!;! <=> ?::-@A@@-AB 6   IH-6@B@/@L@B@- -)/- mmwxxlll =+++=++++= ( ) ( ) IHA@)@B@B@ - ) - ) )-)- mmxbwl =++=++= ( ) ( ) IHJ8)@L@B@ - ) - ) )/-/ mmxbwl =++=++= ;3*  .d        = =−=−= == = IH)6-AJ- IH)A@A@-6@ IHA@ IH-6@ ) ))-) )-)) NmmT mmlll mmll mml <[E!c<68gτf)8H?.I ⇒+=> 4&2N,0$ [ ] mm T d -/K/B )8-K@ )6-AJ- -K@ / / ) ) ==≥ τ ⇒<[P ) /AHIKh0' )@-  K )@K )8 8BIH - ) / =+++= nomk hkbll  :!;! <=> ?::-@A@@-AB 8   ;A*  .d        = =−=−= == = IH)//L-JL IH)88J8-6@ IHJ8 IH-6@ / -6)6 -/-6 NmmT mmlll mmll mml .0' )@-.d ( ) ⇒÷= ))8J@ x l [ IH)@@ mml x = <[E!c<68gτf-@ [ ] mm T d 6-KAB )8-K@ )//L-JL -K@ / / / / ==≥ τ ⇒[P / AAHI ; ;+  :!;! <=> ?::-@A@@-AB B   P6@HI .d        = = = = IH86@@JA IHA@ IHJ8 IH-6@ - )- -/ NmmT mml mml mml CDP2 01 /  :!;! <=> ?::-@A@@-AB A   IHJ8A/ )-B 86@@JA- - / - / N d T F t === IHAK)88/-@A8K6-BJ @ // NtgtgFF tr === α CDP2 01 - IHBK/6@- )@@/ @LK)LXN86@@JA- - - - - N dw T F o t === IH8K)/)@ XN - - N tgF F t r == β α V IHBK))AA )- NtgFF ta == β /K)@B- -6@ J8AK)88/)A@))AA68K)JBL-@ IH @IH IH68K)JBL-@ - 6BK/)A BK))AA -  -//) -) // - = −+ = −−+ =⇔ =−+−−= === ∑ l lFllFM V MlVllFlFM Nm d FM rra B aBrrA aa IHBKBJ8))AA/K)@B-AK)88/IH -/ NFVFV rBrA =++−=−−−= X kl %@R.d ∑ = @ A M  @-6@)A@J8 -/ =−+⇔ Btt VFF N FF V tt B 68K866B -6@ )A@J8 -/ = + =⇔ NVFFVV AttBA )8KB8-L -/ =⇒+=+ .3Ea& !5b< IH6L8@@-A8K@ NmmTMMM xzyzbd =++= ⇒#=> 4&2&% [ ] IH/8K6) A@)K@ 6L8@@- )K@ // mm M d td D ==≥ σ ⇒Y)-%JK"!NW! ) 8K - /K/ <dm21 #=> 4&)@n⇒[#=> 4&2P - 66 HI bke  :!;! <=> ?::-@A@@-AB J   ? P B)/J/6K87 [ ] ⇒=≥⇒ 6/K66 )K@ / τ td C M d [P < 6A An.dP < 8)⇒Y)B%)@K"!NW! ) BK - 6K/  <[#=> 4& o 2P6@ ;3* CDP2 p.0#.2YX0-.dKPX2Wp. 0#.qr kl E$N.d5X r F sP2 kl  NFF or ))-8I - NH- ) =≈ α IH6K/6B) 8KJ- )6-AJ-- - ) ) ) N d T F t === IH)K)/// XN ) ) N tgF F t r == β α IH))LJ )) NtgFF ta == β Nm d FM aa 8K6L6)A - 8KJ- ))LJ - ) )) ===  ) )6-AJ-H7I @-6@)A@@ )) =++−⇔= ∑ Bar VMF A M IHA/A NV By =⇔ IH)K8L6 NV Ay =⇒ @I)@@-6@H-6@)A@@ ) =+−−⇔= ∑ rkBxt FVF A M IH-K)-A-IHJKJ8A NVNV AxBx =⇒=⇔ ?ke !5 IH-L@B-BA8K@ NmmTMMM yxtd =++= ⇒#=> 4&2) IH68K/B B@)K@ -L@B-B / ) mmd =≥ ⇒[P ) /AHI ⇒[Y)@%JK"!NW! ) 8K - /K/  :!;! <=> ?::-@A@@-AB L   ?ke ? P )BA)A)7 ⇒≥⇒ /K/@ B d [P  /)  :!;! <=> ?::-@A@@-AB )@ [...]... thỏa Trục 1: Fa = 1198( N ) FrA = 2 2 R Ax + R Ay =147 0 N 2 2 FrB = RBx + RBy = 11312 + 870,832 = 142 7 N ⇒ chọn FrB = 147 0 (N) để chọn trước ổ côn cỡ nhẹ 7204 với : C=19,1 ; d=20 ; D=47 ; =37 ; B =14; =13,3 =12; T=15,25; r=1,5 ; =0,5 ; α=13,5 e=1,5tgα=0,36 Fa 1198 = = 0, 814 > e = 0,36 ⇒ X = 1, Y = 0 FrA 147 0 Lực dọc trục do : =0,83.e : > và =XV > - ⟹ +Y =439,2 N =0,83.e =426,4 N = =439,2N ; = + =1637,2N... =============================================================== =3305N = - =18,1kN [ S ] ⇒ điều kiện bền mỏi tại D thỏa Tại mặt cắt C: dC = 47 mm Then: 14 x 9; t1 = 5,5; t2 = 3,8 2 πd 3 bt ( d − t ) W= 32 − 2d ( = 8782 mm 3 ) 2 M x2 + M y M uôn σa = = = 18,45MPa W W 2 πd 3 bt ( d − t ) W0 = − = 18975 mm 3 16 2d T 540087 τa = = = 14, 23MPa 2W0 2W0 ( ) σ b = 600  Tra bảng 10.8 ta được:  K σ = 1,75  K = 1,5  τ ===============================================================