n Chi Tit My GVHD: Xun PhNHN XT CA GING VIN HNG 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1 n Chi Tit My GVHD: Xun PhNHN XT CA GING VIN CHM 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2 n Chi Tit My GVHD: Xun PhLI NI U n chi tit my l mt trong nhng n quan trng nht ca sinh vin ngnh c kh ch to my. n th hin nhng kin thc c bn ca sinh vin v v k thut, dung sai lpghp v c s thit k my, gip sinh vin lm quen vi cch thc hin n mt cch khoa hc v to c s cho cc n tip theo.Trong mi trng cng nghip hin i ngy nay, vic thit k h thng dn ng thng trn sao cho tit kim m vn p ng bn l ht sc quan trng.c s phn cng ca Thy, nhm chng em thc hin n Thit k h dn ng thng trn n li kin thc v tng hp l thuyt hc vo mt h thng c kh hon chnh.Do yu t thi gian, kin thc v cc yu t khc nn chc chn c nhiu sai st, rt mong nhn c nhng nhn xt qu bu ca cc thy.Xin cm n cc thy hng dn v cc thy trong Khoa C kh gip chng em hon thnh n ny! SVTH: Ngc Hi 07707791L Trung Nhn 07705041Phm c Giang 07706741Danh Bo Khnh 07713351Trang 3 n Chi Tit My GVHD: Xun PhTHIT K H THNG DN NG THNG TRNPhng n: 51. ng c in2. Ni trc n hi3. Hp gim tcbnh rng trhai cp ng trc4. B truyn xch ng con ln5. Thng trnS liu thit k:Cng sut trn trc thng trn, P = 8 kWS vng quay trn trc thng trn, n = 55(v/ph)Thi gian phc v: L = 6 nmQuay mt chiu, lm vic hai ca, ti va p nh(1 nm lm vic 300 ngy, 1ca lm vic 8 gi)Ch ti: T1 = T; T2 =0,9T t1= 49s ; t2 = 36s Trang 4 n Chi Tit My GVHD: Xun PhMC LCChng1: Tm hiu h thng truyn ng my...............................................7Chng 2: Xcnh cng sut ng c v phn phi t s truyn.................82.1 Chn ng c in...........................................................................82.2 Tnh ton v phn phi t s truyn................................................92.3 Kim tra iu kin m my v qu ti ca ng c chn...........112.4 Xc nh cc thng s ng hc v lc hc trn cc trc...............12Chng 3: Tnh ton thit k truyn ng xch............................................15 3.1 Tm hiu v chn truyn ng xch.................................................15 3.2Chn s rng a xch.....................................................................16 3.3Xc nh bc xch........................................................................16 3.4Kim nghim bn xch..............................................................19 3.5Kim nghim bn tip xc ca a xch....................................19Chng 4: Thit k b truyn bnh rng......................................................224.1Tnh chn vt liu cho cp nhanh v chm.....................................224.2 nh ng sut tip v ng sut un cho php.................................234.3Tnh ton thit k cho tng cp bnh rng......................................26Chng 5: Chn khp ni...............................................................................385.1Tm hiu v chn khp ni.............................................................385.2Tnh v chn khp ni....................................................................40Chng 6: Tnh ton thit k trc v then....................................................42 6.1nh ngha......................................................................................42 6.2Chn vt liu..................................................................................42 6.3Tnh trc u vo...........................................................................42 6.4Tnh trrc trung gian......................................................................47 6.5Thit k trc ra...............................................................................52Chng 7:Chn ln....................................................................................57 7.1 Cc thng s ln.........................................................................57 7.2 Chn kiu lp ln.......................................................................58 7.3 Bi trn ln................................................................................59 7.4 Che kn ln.................................................................................59Trang 5 n Chi Tit My GVHD: Xun PhChng 8: Chn thn hp bulng v cc chi tit ph khc..........................62 8.1 Xc nh cc kch thc v hp....................................................62 8.2 Cc chi tit ph.............................................................................64Chng 9: Bng dung sai lp ghp.................................................................66Ti liu tham kho...........................................................................................67Trang 6 n Chi Tit My GVHD: Xun PhCHNG 1TM HIU H THNG TRUYN NG MYThit k h thng dn ng thng trn m bo yu cu cng sut trn trc l 8kw s vng quay trn trc thng trn l 55 vng/pht, thi gian phc v l 6 nm, quay mt chiu, lm vic mt ca, ti trng va p nh (mt nm lm vic 300 ngy, mt ca 8 gi). Ch ti trng cho nh hnh sau:T1=T, T2=0,9T, t1=49, t2=36 tha mn yu cu trn ta s dng hp gim tc ngtrclmgimvntctngcvotrc thng trn. Hp gim tc ny c c im l ng tm ca trc v v trc ra l trng nhau. Do c th gim bt chiu di hp gim tc, gip cho vic b tr c cu gn gng. Tuy nhin khi s dng hp gim tc ng trc ta nn ch n mt s khuyt im ca n:Kh nngti ca cpnhanh khng dng ht v ti trng tc dngvocpchmlnhn cp nhanh trong khi khong cch ca hai trc bng nhau.Phi b tr cc ca cc trc ng tm bn trong hp gim tc, lmphctpkt cugi vgykhkhnchovic bi trn cc ny.Khong cch gia cc gi ca trc trung gian ln nn mun m bo trc bn v cng phi tng ng knh trcTrang 7 n Chi Tit My GVHD: Xun PhCHNG 2XC NH CNG SUT NG C V PHN PHI T S TRUYN2.1 Chn ng c in2.1.1 ngha ca vic chn ng c.Chn ng c in dn ng my mc hoc cc thit b cng ngh l giai on u tin trong qu trnh tnh ton thit k my. Trong trng hp dng hp gim tc v ng c bit lp, vic chn ng loi ng c nh hng rt nhiu n vic la chn v thit k hp gim tc cng nh cc b truyn ngoi hp. Do vic chn ng c c ngha kinh t v k thut ln. Nu chn ng ng c th ng c c tnh nng lm vic ph hp vi yu cu truyn ng ca my, ph hp vi mi trng bn ngoi, vn hnh c an ton v n nh. Nu chn cng sut ng c nh hn cng sut ph ti yu cu th ng c lun lm vic qu ti, nhit tng qu nhit pht nng cho php. ng c chng hng. Nhng nu chn cng sut ng c qu ln th s lm tng vn u t, khun kh cng knh, ng c lun lm vic non ti, hiu sut ng c s thp. khi chn ng c in sao cho c th li dng c ton b cng sut ng c. Khi lm vic n phi tha mn ba iu kin:+ ng c khng pht nng qu nhit cho php+ C kh nng qu ti trong thi gian ngn+ C mmen m my ln thng mmen cn ban u ca ph ti khi mi khi ng.2.1.2 Chn loi v kiu ng cHin nay trong cng nghip thng s dng hai loi ng c l: +ng c mt chiu+ng c xoay chiuThng thng ng c xoay chiu thng c s dng rng ri trong cng nghip v c sc bn lm vic cao, moment khi ng ln. Bn cnh ng c mt chiu c th iu chnh m tc trong phm vi rng, ng c bo m khi ng m, hm v i chiu d dng. Nhng gi thnh t, khi lng sa cha ln v mau Trang 8 n Chi Tit My GVHD: Xun Phhng hn ng c xoay chiu v phi tng thm vn u t t cc thit b chnh lu.T nhng u im trn ta chn ng c in xoay chiu2.2 Tnh ton v phn phi t s truyn2.2.1 Chn ng c in chn ng c in ta cn tnh cng sut cn thit. Nu gi p l cng sut trn trc , l cng sut chung, Pct l cng sut cn thit, thtdctpP3.11[1]Do ti trong theo bc vi s ti hnh bn ta c .n2i2 ii=1td nii=1T( ) .t49.1+ 0,9 .36TP =P =8.49+36t =7,67(kw)Trong 2 41 2 3 4 1= 0.92- hiu sut b truyn xch ( h)2= 0.97- hiu sut b truyn bnh rng3= 0.995- hiu sut ca mt cp ln4= 1- hiu sut khp ni7, 679, 04 ( )2 40,92.0,97 .0,995 .1tdpP kwct Tnh ton s b s vng quay ng c.T s truyn chung: u = uh.uxuh: T s truyn hp gim tcux: T s truyn b xchda bng 3.2 [1]uh: 8 40Trang 93.10[1] n Chi Tit My GVHD: Xun Phux: 2 5=> u: 16 200Vi cc b truyn nh trn, ta c th chn tc ng c trong khong sau:ndc = nct.uvi nct = 55=> ndc : 672 3200Cn phi chn ng c in c cng sut ln hn Nct.Trong tiu chun c nhiu loi ng c in tha mn iu kin ny.Nu chn ng c in c s vng quay ln th t s truyn ng chung tng, dn n vic tng khun kh, kch thc ca my v gi thnh thit ca b cng tng theo (tr ng c in). Nhng ng c c s vng quay ln th gi thnh h hn v ngcli. Nuchnsvngquaythpth tstruynngchungnhdo khun kh ca my gim v gi thnh h. V vy cn tin hnh tnh ton c th chn ng c in c s vng quay sao cho gi thnh ca h thng dn ng thng trn l nh nht. y l mt vic lm rt cn thit trong i sng kinh t hin nay. y ta chn ng c 3K160S4 cung cp bi cng ty Viet - HungariKiu ng cCng sut (Kw)Vn tc quay (vg/ph)%maxdnTImindnTIkdnTTcosKhi lng(Kg)3K160S4 11 1460 87,5 2,0 0,5 2,2 0,87 1062.2.2 Phn phi t s truynT s truyn ng chung146026,5555ndcu u u uxnh chnt Trong ndcs vng quay ca ng cnt=52 s vng quay ca thng trnunh t s truyn ca b truyn bnh rng tr nghing cp nhanhTrang 10 n Chi Tit My GVHD: Xun Phuch t s truyn ca b truyn bnh rng tr nghing cp chmux t s truyn ca b truyn xchTa chn ux= 3 theo bng 3.2 [1]26,558,853huu u unh chux to iu kin bi trn cc b truyn bnh rng trong hp gim tc bng phng php ngm du ta ly:2,97hi i unh ch Th li s vng quay ca trc thng trn:146055 /2, 97.2,97.3n vg ph ng vi yu cu t ra.2.3 Kim tra iu kin m my v qu ti ca ng c chn- Mmen nh mc ca ng c11dmdc9550 9550 72dmdcn 1460dcpT Nm 3.4[1]Trong dmdcp cng sut nh mc ca ng cndcs vng quay ca ng c.- Mmen m my ca ng c2 144dmdcT T Nmmm - Mmen ln nht trn trc ng c2, 2 158, 4axdmdcT T Nmm - Mmen nh nht trn trc ng c0,5 36min dmdcT T Nm - Mmen cho php ca ng c0,81 128,3max cpT T Nm - Mmen cn ca ng cTrang 11 n Chi Tit My GVHD: Xun Ph9550 59,13ctdcPT Nmcann - Mmenqu ti cc i ca ng c1, 4 82,8ax qtT Tcanm NmNh vy ta c:11 w 9, 04 wdmdcT 59,13 144can82,8 128,3ax qtp k P kctNm T NmmmT Nm T Nmcpm > < < Kt Lun: ng c chn tha mn cc iu kin lm vic ca h thng. m bo vn hnh h thng dn ng thng trn tt.2.4 Xc nh cc thng s ng hc v lc hc trn cc trc2.4.1 Tnh ton tc quay ca trc1460( / )1460( / )1414601491,58( / )22,97491,582165,52( / )32,97165,52355,17( / )3xn vg phdcndcn vg phnn vg phunhnn vg phuchnn vg phttu Trong ndc s vng quay ca ng cn1 s vng quay ca trc 1n2 s vng quay ca trc 2n3 s vng quay ca trc 3ntt s vng quay ca trc thng trnTrang 12 n Chi Tit My GVHD: Xun Ph2.4.2 Tnh cng sut trn cc trc-Cng sut danh ngha trn trc ng c9,04 wdc ctp N k -Cng sut danh ngha trn trc 11 3 49, 04.0,995 9 wdcp p k -Cng sut danh ngha trn trc 22 1 2 39.0,995.0,97 8, 69 w p p k -Cng sut danh ngha trn trc 33 2 2 38, 69.0,995.0,97 8,39 w p p k -Cng sut danh ngha trn trc thng trn3 3 18,39.0,995.0,92 7, 69 wttp p k 2.4.3 Tnh mmen xon trn cc trc6 66 61116 62226 633369, 049,55.10 9,55.10 59131,51 .146099,55.10 9,55.10 58869,86 .14608, 699,55.10 9,55.10 168821,96 .491,588,399,55.10 9,55.10 484077, 45 .165,529,55.10ctdcdctttNT N mmnpT N mmnpT N mmnpT N mmnpT 67, 699,55.10 1331149,18 .55,17tttN mmn Trang 13 n Chi Tit My GVHD: Xun PhBng s liu ng hc v ng lc hc trn cc trc tnh c ca h thngTrc Cng sut T s truyn Mmen xon S vng quayTrc ng c 9,04159131,51 1460I9 58869,86 14602,97II8,69 168821,96 491,582,97III8,39 484077,45 165,523IV 7,69 1331149,18 55,17Trang 14Thng s n Chi Tit My GVHD: Xun PhCHNG 3TNH TON THIT K TRUYN NG XCH3.1 Tm hiu v chn truyn ng xchXch truyn chuyn ng v ti trng t trc dn sang trc b dn nh s n khp gia cc mt xch vi rng ca a xch. So vi b truyn ai b truyn xch c nhng u im sau:- Khng c hin tng trt, hiu sut cao hn, c th lm vic khi c qu ti t ngt - Khng i hi phi cng xch, lc tc dng ln trc v nh hn- Kch thc b truyn nh hn b truyn ai nu truyn cng cng sut v s vngquay.- B truyn xch truyn cng sut nh vo s n khp gia xch v bnh xch, do gc m khng c v tr quan trng nh trong b truyn ai v o c th truyn cng sut v chuyn ng cho nhiu a xch b dn.Tuy nhin b truyn xch c nhng nhc im l do s phn b ca cc nhnh xch trn a xch khng theo ng trn m theo hnh a gic, do khi vo v ra khp, cc mt xch xoay tng i vi nhau v bn l xch b mn gy nn ti trng ng ph, n khi lm vic, c t s truyn tc thi thay i, vn tc tc thi ca xch v bnh xch thay i, cn phi bi trn thng xuyn v phi c b phn iu chnh xch.C 3 loi xch chnh l xch ng, xch ng con ln v xch rng. Xch ngn gin, gi thnh h v khi lng gim v khng dng con ln, nhng cng v th m bn l mn nhanh. V vy ch dng xch ng i vi cc b truyn khng quan trng mc khc yu cu khi lng nh.Xch ng con ln gi tt l xch con ln, v kt cu ging nh xch ng ch khc ngoi ng lp thm thm con ln, nh c th thay th ma st trt gia ng v rng a bng ma st ln gia con ln v rng a. Kt qu l bn ca xch con ln cao hn xch ng, ch to khng phc tp bng xch rng, do xch con ln c dng kh rng ri.Trang 15 n Chi Tit My GVHD: Xun PhXch rngc kh nng ti ln, lm vic m, nhng ch to phc tp v gi thnh t hn xch con ln.T nhng u im trn v do b truyn ti khng ln nn ta chon xch ng con ln. 3.2 Chn s rng a xch- Chn s rng ca a xch dn129 2 29 2.3 23xz u - Tnh s rng a xch b dn 2 13.23 69xz z u 3.3 Xc nh bc xch- Xc nh cc h s iu kin s dng xch theo cng thc (5.22) [1]0 r a dc b lvK K K K K K K Trong Kr:h s ti trng ngKr=1,2do ti va p nhKa:h s xt n nh hng ca khong cch trcKa=1 do chn a=(3050)pcK0:h s xt n nh hng ca cch b tr b truyn K0=1Kdc:h s xt n nh hng ca kh nng iu chnh lc cng xch Kdc=1 c th iu chnh khong cch trcKb:h s xt n bi trn Kb=1 bi trn nh gitKlv:h s xt n ch lm vic Klv=1 lm vic 1 ca1, 2.1.1.1.1.1 1, 2 k Trang 16 n Chi Tit My GVHD: Xun Ph- Tnh cng sut tnh ton- Theo cng thc 5.25 [1]3xKK K Pz nptKChn xch mt dy nn Kx=1Trong :Kz h s rng a xchKn h s vng quay P3=8,39kw cng sut cn truyn101325 251, 09232001, 21165,52KzznKnn 31, 2.1, 09.1, 21.8,39 13, 28 ( )xKK K Pz nP kwtK Da vo bng 5.4 [1] theo ct n01=200vg/ph ta chn bc xch pc=31,75 ng knh cht do=9,55mm, chiu di ng bo=27,46 v [P]=19,3.Da vo bng 5.2 [1] s vng quay ti hn ng vi bc xch 31,75 mm l nth=630 vg/ph, nn iu kin n