MỤC LỤC
Huong phat tri~n quan tr(;mg cua may CNQTN Is. tang cong suat truy€!n d/)ng chinh, nang cao tri s6 gia toe, giarn toc, tAng lue ep khi can, giam thai gian can, tang kh6i lUQng phOi nham nAng caD nang suat may. Do do, ngu'bi ta thuang dung trong truyen d¢ng chfnh cac d/)ng co ffi¢t ehillu eo cang suiH gioi h~n. Cac d~ng eo owt ~hi€!u c5ng suilt Ion dung cho may can eo cilu tl.lO dam baa. Chi s6 kI thu~t a cang Ion thl nAng sulit may can eang Um voi cung rn¢t eOng suat.
Neu clin phai lAt phOi tru:6c khi can tiep thi phai tang thai gian nay len. Thai gian nghi giUa 2 pMi can tuy thu¢c vao thai gian rna co diu fip trl,lc di chuyen tit vi tri thAp nhAt l{!n cao nhiit. Sau khi dnh m6men truyen d()ng dang tri Mtdll't cho tcit ca cae h1n CaD eua 1.
Thol.lt dAu VI' con nha, anh huang eua Cll9n phan hoi duang dong DD khOng dang k~ va cu(m ftm ap AA chua co dong do khftu nga.t nen di~n lip U F dU<;lC tang cuong bue. Qua trinh rna may co tM' Wfn hanh theo nhi~u cap tuy theo s6 cAp Vss diiLt ra. Tri s6 U'ss giam nhanh xu6ng Vss va eue)n AA co dong IOn eh:;ty qua. Tac dung phan hoi am ap lam Ur: giam nhanh. Day la trUb'ng hQp ham de)t ngi,lt. Mo may va ham thea chieu nguQe xay ra tuong tl,t nhu vua xet. De tranh s.t.d. cua AA coi nhlt baa hoa M~ch nay lam vi~e dung khi ngltong rna cua cac di6t Ion hon UF ho~c bang di~n ap djnh muc cua cu6n AA. *) Sa do di~u chinh dong kich til cua dong co (Ikll)ã Dieu chinh IktD chinh la dillu chinh tu thong (tp[) cua no. Quy lu~t tang, giam tit thOng dltoe suy tu cae phuong trinh co ban rna k~ãt qua dltQe bieu thj boi cac dltang cong a hinh 8-16. Blnh thllong, s.t.d eua ctlon CD.MDKD co xu huang tang dong kfch ttt eua d¢ng Cd, con s.t.d.
Truy~n d¢ng rieng re thl10ng t1ng dl,lng cho cac may can cong suat Ion rna dtlang kinh tr1,lc can thtlong Ion hon lOOOmm. Dong nay Be tAng cubng dong kfch til: cua may phat dip di~n eho dQng co co toc dQ thap va giAm dong kfch til: cua may phat dip di~n cho d¢ng co co t6c d¢ cao. DAu ra cua khftu MU lil di(ln ap ti If! voi dong dQng cd con dau ra ella khau ME Hl. Trong m!iu nay, hang 56 thai gian di~n tu T cUa phfin ung va hang so thbi gian di$n Cd T rn dllQC chlnh bang gia tri thu'c trong htf! truyen dong nUlY crin. thl!C cua thanh phlin dong dQng, con tin hieu cua khau ME se ti l~ vdi gia tr~ thlJc eua s.d.d d¢ng cd. tri cl,1e d~i cua d~c Hnh vi).n hanh thi se du'Qc dieu khien Mi bO tOng II , tae dOng If!n thiet bi ro Ie Re dti rna khoa kh6ng tiep diEl'rn K ngling d¢ng cd.
B¢ bien d6i chuc nang Be thl,1C hi~n phan hoi duang ve di¢n lip cua TKTJ nha.m giam cllong bue ve diim ap cua TKT1• TKT2 khi giam tll thong va tang. De tranh qua ap phAn ung d¢ng Cel co thit xay ra khi thay doi m~nh tu thOng, phan hoi am ap d¢ng Cd dUQC dua tai dau vao eua eae h(l R~ , R~. May can Ii co thCi la lien tl,lC (neu ph6i di lfin IUQt tu hQp can nay sang h¢p can khac mQt cach lilln tl,lc) hoi;j.c nua lien tl,lc (neu phOi dUQc can di can l<:l-i a hQp can nay rai moi qua Mp can khac).
Trong khi chuyen tr~n bang Ian vao may guiln, kim lo~i duqc thOi lam l?nh xu6ng nhi~t d¢ cAn de qwln. - Qua cac Ian can, kim lo~i chua nguOi nhieu nen chat lUQng san pham t6t, tu6i th9 trl,lc can caa han, giam dUQc su.1t tii§u haa nAng luqng. Trang khoang thai gian (tl + t2 ) thi dong d¢ng ca Ian hdn dong tai dnh Ie. che dO qua dO dt1~c xac d~nh thea dl)c dnh dOng ca ed xet den Sl,lt ap do cam. khang tren mliich phan dng nen dT, U-I~Il-Llldt. eua dong di¢n Irong tnldng ho;)p phI,! tai xung. Vi luc co tAi xung. L dt Ian nl'ln /luId cllng UIO. va s~ cAn bAng toe dO giua eac hOp can, gAy ra san pham kern vA thl),m chi pM.
Tom ll;li : a may CNLT can dap I1ng yl!u cliu Cd ban la duy trl mOt ti 86 t6c d6 nhat dinh giua cac hOp can va di~u chinh dligc t6c dO dOng cd thea yeu cliu cua.
Dau vaa clla b¢ nhan BN 1ft tin hi(iU I'a cua b6 khuech d~i KD va tin hi$u dieu khicn UK tUdng ung voi d(l ep thvc te va dut;1c xac djnh boi cac thOng s6 can. Sd d6 dieu chlnh toc db tren 2 vung : Toc dO eao hon toc db Cd ban duqc dieu chinh bang sV thay ddi tll th6ng dOng Cd. TRANG BI D1f:N MAY CAN NGU(lI. Khai ni~m va cong nghe can nguoi va dac diem may can nguoi. Vl thE!', phai tiE!'n hanh can nguOi thep mongo. Cac may CNg cling chia ra : can lien tl,lC vll cin quay thu~n nghich. Ta x{it mQt dAy chuy~n v~ can nguQi. Sau do cac bAng thep qua may danh vAy va can luy~n vCli 11)C ep nM d~ Uiy co cac vAy vA rl rei vao dAy chuy€!n tiiy rl bang axit. Trang bg ta:y 12 con co cAm bii!n dl) Yang 14 dl)t trong lap lot day bg de' giup cho vi~c di~u chtnh tl,t dqng dl) Yang bling tMp trong bg nhlkm dAm bAo dl) ng~p sdu clin thigt khi ta:y cac bang thep. Qua day chuy~n lAm s~ch, thep Iii cUl)n dUQc dua vao may can ngul)i.
Cac may can li~n tuc nhieu t~c co nhieu uu diem nhung ket cau c6ng kenh, phuc t~p, gay khd khan cha baa duong nen khi can can cac bang tMp mong, nguai ta dung may can nguQi quay thu{ln ngh~ch de can nhieu lfin toi dQ mong d.n thie"t. May thuong lam vi~c ache d¢ can ca.ng va can dam bao 1uc ca.ng thea yim cau.
Trong cac may can day nhom II (khong thay d6i 111Qng day d cac tang keo trung gian), ngu'ai ta dung truy~n d9ng m¢t chieu vll tl,i d9ng dillu chinh t6c d9 qua dieu chinh tu thOng. Tang toc dOng Cd ID thea nguyen t:ic thai gian nha rdle thi1i gian Rth co d(>ng Cd d@' Ian h1qt dong.
Tang toc dOng Cd ID thea nguyen t:ic thai gian nha rdle thi1i gian Rth co d(>ng Cd d@' Ian h1qt dong. Sd do truyEn dQng thyristor may can day 7/550. Trll{Jc khi vao rul5 qulin, day qua tang vang moc. Tang vang moc dung de bu trii: cac daD dOng suc cang. Rula qulin dllt;lc truy~n dOng cung bang M T-D. cac dOng cd dll.-;1C ki~m tra qua cac may phat tdc. tu cam bien s.d.d. ti I~ voi dong philn ung qua cam bien CBL. TRANG BI D1~N cAc THIlh BI PHI) TRONG PHAN XUONG cAN.
Di~n lip may phat du:qc so sanh voi tin hi~u d~t cho phep h~ kfch ttl tac dQng nhanh voi. So d6 dam bao d~p tu thong kich tu may phat, lo~i tru toc dQ bo cua trl,lc ep va gill cAn bang t8.i gilla 2 trl,lc vit khi chung lam vi~c dong tliai. Khi clin chia dQc bAng thep thanh nhi~u dai nho, nguai ta dung may clit dIa trim co nhi~u dla gIln tran 1 tI'l,lc.
May cAt hay dung d~ cAt cac tAm kim lo~i t~n duetng can rna khOng cAn dirng kim loFP. Khi may clit bay dung cAt bbg d!u cAe bAng thep va cAt cac bAng t.hep thanh tirng do(\n thl ch~ dQ quay dao bay co th~ khOng li~n t1,lC rna khai dQng va hAm cd chu kl, nghIa la dao khdi dQng tAng t6c tnt6'c m6i ltin cAt va bAm dirng sau khi clit. MAy cAt bay IO(li quay tri)D co quy dQ.o dao la hlnh trim va khi dao W!p xuc kim lo~i. se t'ilO m,ot gOc nAo dd so vOi m~t pha.ng thAng dung qua 2 trl,lc tang tr6ng, gAy mOt xung I\1c Ion khi cAt vA m$t pha.ng cAt khOng phAi IA thAng dung. nhAt la d6i vai vi~c cat cac bang thep day, ngttbi ta dung may cAt bay lo~i tay bien. o lo~i may cat nay, quy d~o dao co dl;lng ellip phuc t~p va khi cAt dao chuy~n. dOng gan nhu trlm mi}t phling bAng thep. Khi cAt, Uti bii!n d6i dOt ngOt. kh6ng dong bl).
CUC>D kfch ttl may phat KTF n6i vao sa d6 dao chil!u vi phan voi cae khuech dli1i ttl 3KDT va 4KDT. Ian s.t.d dieu khien cua tang khu~ch dl;li dilu dl1Qc xac dtnh hOi tdng dl;li 86 cac tin hi~u d~t. Che do nay co khi may ca.t bay khOng cci.t hay cAt cac bAng thep voi khoang cach ngAn nhil:t.
Do Ia vi cac cu~m d~t cua bti di~u chinh di~n ap va dieu chinh ttt thOng noi cung voi dau ra b¢ d~t n~n tin hi~u toi cac cutin do la delng thai.