CAC PHAN TO Cd BAN TRONG TU DONG HOA
BANG T^l Md
TS. KH<5NG CAO PHONG.
yBd mdn Ti/ddng hda xl nghidp Md vd Ddu khf Trudng DH Md - Dia Chdt
Email: [email protected]. vn
Tom t i t
Bang tai da dUOc suf dung td rat lau trong cong nghi^r cung nhu trong cong nghiop IVlo of Viet Nam. Tuy nhii cho den nay cac bang tai 6 Viet Nam da so van siJrdung car thiet bi cu lac hau hoac thieu dong bo. Oe gop phan di/a r;
goe nhin tong quat ve cac thiet bi tU dong hoa bang tdi cac phan tiif tU dong hoa co ban duoc trinh bay trong ba bao nay.
Abstract
Conveyor bells were applied for long time in industry ani also in mining industry in Vietnam. However, almost of the conveyor belts in Vietnam use the old technology i order to give an ovevievv of the automatic equipmer- this paper presents main components applied in automization for conveyor belt.
I.MdoAu
Bing t i i d i 6ugc sd dyng td liu trong cdng nghidp ndi chung va cdng nghidp md ndi ridng 64 van t i i cic nguydn vat lieu, cau kidn nhe hay thinh pham cua q u i trinh cdng nghd. Cung vdi sU phat triln cua khoa hpc ky thuat, bing t i i trdn t h i gidi cung dan dan dupe trang bj cic hd thdng tu ddng hidn dai. Tuy nhidn d cic md va cic nhi miy tuyin d Viet Nam van sd dyng cic he thdng dilu khiln tu ddng cd, lac hiu (1) (2) hoac 6ugc trang bj thilu ddng bd. Cung da cd nhdng 64 tai tdt nghidp cua sinh vidn nghidn cdu thuc hidn vide tU ddng hda cho cic tuyin bing, nhUng cung chua ehl rd dUpc ydu cau v i dng dung cua cic phan td tu ddng hidn dai vio he thdng bing t i i .
O l gdp phan dUa ra cii nhin khii quit v l hd thdng thilt bj tu dpng hda cho bang t i i Md, chdc ning v i dng dyng, bii bio nay sd gidi thidu v l ydu ciu cdng nghd v i cic phin tdcp bin d l thuc hidn tUddng hda cho cic h§ thdng bing t i i Md.
II. Yiu cAu CONG NGHC COA VAN TAI BANG BANG TAI
1. Yeu cau he thong
Bing t i i dUpc lip dat 64 vin chuyin cic nguydn v i t lieu trong cic nginh cdng nghidp. Trong nginh Md d Vidt Nam, bang t i i dUpc sd dyng 64 van t i i than d i d cic md than hay cic nha may sing tuyln.
TUddng hda cho tuyln bang chu ylu van l i vide bio vd he thdng bang trong cic trudng hpp cy t h i , giim thilu v i loai bd cac nguy hilm cho he thdng. Nguydn tSc cCia cic phan td bio vd nay la phit hidn cic sU cd v i loai bd khi nang sU co xiy ra nghiem trpng hon (3).
Ydu cau tu dpng hda cho mdi he thong bang t i i phu thupc vao chilu d i i cua bang. Vf du vdi he thdng bang t i i
trdn 1000 mdt v i cd dilm chuyin t i i thi ydu cau tU ddng hda theo tidu chuan cua Anglo American (4) l i :
• Hd thdng dilu khiln quin ly bang t i i thdng minh
• Cdng tic kdo an t o i n bd trf trdn moi khoing cich an toin (6 c i hai bdn cua bang t i i - phu thudc vio he thdng)
• Tat c i cic cdng tic kdo cin dUpc dinh sd rd rang.
• Cic khda kdo cd t h i ed cdi bio va den hidu.
• Mdc treo cho diy kdo dupc bd tri each d i u nhau trdn toin he thdng
• 2 cim biln lech bing (dat d d i u v i dudi bang)
• Cic cim biln ldch bang cd t h i dupc bo tri thdm d cac doan cong cua bang (trudc v i sau dilm cong) nlu can thilt.
• 2 cim biln rich bing (diu v i dudi bing)
• 1 cim biln dao ddng
• Giim chin chdng dao ddng (diu v i dudi bing) cung cip cho bing t i i tuy theo ydu ciu cua nhi thilt kl.
• 2 cim biln tdc dd (diu v i dudi bing) (hiln thj tic dp nlu cin)
• 2 cdi hidu v i ddn hidu khdi ddng (dau va dudi bang) (tdi thilu IGSdB)
• Cim biln chong un cSp lieu (kilu cdng tic, kilu song sidu i m (microwave), kilu radar hay kilu phdng xa (cin giiy phdp sd dyng))
• 4 cdng t i c un than
• 4 cdng tic gidi han hinh trinh
• 1 cdng tic nghidng bang
• Tu dilu khiln khdi ddng ddng cho cic ddng cP truydn ddng
• Lidn ddng khdi ddng dCmg cho hd thong ghdp ndi nhilu bang
• 1 PLC dilu khiln hoac thilt bj dilu khiln bang t
• 1 bd dilu khien ddng cP (cd t h i sd dyng biln tan - khdi ddng mem nlu can thilt)
• Silo va thung chda (dng dyng ddc lip)
• Cim biln bio day dang edng tie, dang vi sdng hay cim biln phdng xa (ddi hdi cd gi^y phdp xd dyng).
• Cim biln mdc Silo kilu radar (khuydn dCing) hay cim biln sidu am)
Mpt sd thilt bj khic cd t h i dupe sd dyng tuy theo cic ydu cau cy t h i vf dy nhu ein bang, cim biln phit hidn kim loai, pheu rdt, cic eP cau thuy lUc, he thdng d i p byi...
2. Yeu cau dieu khien
Ydu cau ciu hinh chUPng trinh dilu khiln cOa thilt bj dilu khien bing phii dim bio theo ydu ciu cdng nghd nhu sau:
• Sd lan khdi ddng lidn t i l p sau khi khdi ddng bj Idi khdng dupe qui hai lan trUde khi cic kilm tra dilu kidn an toan 64 bilt chfnh xic sU c6 va cho phdp lan khdi ddng thd 3.
• Thuc hidn ehl dd cinh bio chuan bj khdi ddng.
• Thuc hidn ehl dp khda an toan va lidn ddng (khdi ddng - di^g).
• Thuc hidn khdi dpng va ddng theo trinh tU
• Thuc hidn dilu khiln ting tdc va giim tdc
• Cic bing t i i dai cd thilt bj dieu chinh tdc dp cd t h i thuc hidn ehl dp khdi dpng ting tdc tdi tde dp tdi da hay tdc dp d i t trudc.
• d ehl dp ddng sU co hay lidn ddng, bing t i i ddng tU do.
• Chi dp giim tdc va d i ^ g 6ugc thuc hidn trong ehl dp ddng binh thudng.
Khi thilt k l mdi cho mdt he thong bang t i i , ngudi thilt ke kit cau can phii nhin thdc dUpc ring trong ehl dp hoat ddng binh thudng, bang t i i se thUe hidn dCmg tU do. Cie tic ddng cP hpc trong k i t cau bang t i i gay ra bdi ehl dp di:mg tu do can dUpc tinh toan khi thilt k l bang. Tat ei cic thilt bj an toan va lidn dpng qua trinh tao ra sUan toin cua he thdng bang t i i .
III. cAc
P H A NTijr
T R O N G T I / D O N G H 6 A BANG TAI- NGUYEN
LY V A UTNGDUNG 1. Cong tac keo an toan va nut dimg khan cap
Cdng tie keo la thilt bj dung 64 ddng bang d mpi vj trf trdn tuyln bang. Cdng tac keo dupe bd trf lip d i t tai dudi ciia bing, khu vUc bio vd xung quanh dudi bang v i d hai phfa cOa bing t i i dpc theo tuyln bang. Cdng tic keo cd tie dyng bio vd cdng nhin khdi cic tai nan ding tile. Cdng tic 6ugc ydu cau lap d i t theo luat an toan va sdc khde tai mdt sd qudc gia.
Cic edng tie kdo can bd tri vdi khoing cich 30-50m ddi vdi cic bang t i i trong nha, 50-100m ddi vdi cac bing t i i ngoai trdi v i d mpi vj tri ma con ngUdi cd khi ning t i l p can dupc vdi bang t i i . Cdng tac keo ehl cd t h i bd qua d mdt sd trudng hpp die bidt va dupc sU phd duydt cCia ngUdi cd tham quyln (4).
Luc keo ydu cau khdng vUpt qua 70N 64 lam cho cdng
tic tic ddng, vdi lUe tie ddng vudng gdc vao tam eua diy dan v i khoing cich di chuyin khdng qua 300mm. LUe tie ddng cCia cdng tic theo hudng dpc theo diy dan khdng 6ugcvupt qui 230N.
Cic mdc treo cho diy keo eua cdng tie can 6ugc bd tri vdi khoing cich tdi da l i 6m v i tdi thilu l i 4m (4). Cic cdng tic kdo thudng cd cic bd phin hiln thj cP khf (ed) quang (ddn hidu) hoic i m thanh 64 ed t h i phin bidt 6ugc rd ring vj trf su cd. Thudng thi tfn hidu tU hai edng tie lidn
a. Khda ddy an todn
C H i X N A b. Nut bdm khdn cdp Hinh 1
t i l p d hai phfa eua dilm sU ed se ehl ra 6ugc vj tri cua sU cd. Cic cdng tic keo cung cd t h i 6ugc thilt k l 64 phit hidn hidn tupng ddt eip keo gida cic cdng tic.
Nut ddng khan cap cd t h i 6ugc bd trf d cac vj trf kilm tra cac sU cd khan cap. Cac nut ddng cd t h i ndi song song vdi t i l p dilm cila khda keo hoic ndi true tilp tdi mach bio vd cua ddng cP.
Tin hidu td cdng tac keo v i nut ddng khan cap 6ugc dUa tdi cac mach sU ed eua he thdng dilu khiln truyen dpng bing 64 thuc hidn ngat ngudn didn tdc thdi khdi he thdng khi xiy ra sU cd. Cac cdng tic keo va nut ddng khan cap hoat ddng theo nguydn tic tu khda (duy tri trang thii sU cd) khi bj tic ddng. Trang thai sU cd chi 6ugc giii trd bdi cdng nhin van hinh khi kilm tra dim bio dieu kidn an toan.
Ydu cau cua he thdng phy thudc vao chilu dii lap dat cOa tuyln bang, cac hUdng dan sau ed t h i 6ugc sd dung tham khio:
• d he thdng thdng minh (intelligent system), cie bang t i i cd chilu dai Idn hPn 500m cin 6ugc lip dat he thdng edng tic kdo cd t h i xic djnh chfnh xic vj tri keo hay thilt bj bio vd tic dpng.
• d he thdng ban thdng minh (semi-intelligent), vj tri cic cdng tic tie ddng khdng can phii dupe xic djnh d phdng dieu khiln trung t i m nhUng loai sU cd xiy ra trong he thdng can 6ugc ehl rd.
• d he thdng thy dpng (passive), dung cho cac tuyln bing dUdi 200m, chi thj sy ed chi ydu cau xic djnh tai vj tri
SUCO.
2. BSo ve tri/ort bang
Tdc dp eua cic phan td can phii phu hpp trong tat c i cic bang t i i . Khi tdc dd cua cac phan td cd sU sai ldch vupt qui gidi han cho phep thi sU cd trUpt bing can dupe phat hidn. Cac rp-le tdc dp hoic cim biln tdc dp 6ugc sii dung trong he thdng 64 bio vd sU cd trUpt bang.
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d nhdng bing tii dii, hai cim biln cd t h i 6ugc sd dyng de so sinh tdc dp d dau bing v i dudi bing. SU khdng d6ng bd tdc dp cCia cic phin td niy cd t h i giy ra sU c6 bing.
d nhOng bing tdc dd cd djnh sy c6 dUpc xic djnh khi bing lim vide d dUdi 80% eua tdc djnh mdc. Tfn hl^u si^ c6 tdc dd thap ed t h i 6ugc bd qua bdi phcln m i m trong qui trinh khdi ddng v i ddng bing 64 trinh nhdng tic d^ng bio vd khdng cin thilt.
d bing tdc dd biln ddi hoat d^ng khdi d^ng 6ugc xic djnh theo gidi han theo tfnh toin t^i cic vj trf 6ugc md t i bdi cic kysu thilt k l .
Rp-le tdc dd bao gdm mdt nam chim vinh cdu gin trdn true quay v i mdt rd-to tao ra md men t^ Id vdi t6c 66 quay cua tryc, hai cdng-tic tic ddng tuy theo chilu quay cCia tryc v i he thdng cp khf dilu ehlnh gidi han tic ddng cCia rp- le (Hinh 2).
Phin vd thdp cua rd-to cho phdp khdp kfn mach tU v i 6ugc gin vdi phin tao md-men cCia rd-to. NgUdng tic ddng eua rp-le 6ugc bd tri d chfnh gida phfa dUdi eua rd-to nhu trdn hinh ve. Cic Id xo 6ugc sd dyng 64 gid rd-to khdng quay khi rp-le khdng hoat ddng.
Khi nam chim vmh cdu quay, ddng didn 6ugc tao ra d cic thanh din dang Idng sdc ty Id vdi tdc dd quay. Ddng didn nay tuong tic vdi td trudng cua nam chim vinh cdu, gidng nhu d ddng cP rd-tor Idng sdc, 64 tao ra md-men cung chilu vdi chilu quay cua nam chim vinh cdu.
Tdc dp quay cua tryc rp-le cing Idn, md-men tao ra trdn rd-to cang Idn. Rd-to tic ddng tuy theo lUc thilt lip trdn Id xo v i hai cdng tic gidi han. Khi tde dp tryc rp-le giim xuong cae Id xo lai phyc hdi vj tri eua rd-to v i trang thii cua edng tic gidi han.
Squirral-caga conductor Ponnanent fnsgn^t
Cim biln tdc 66 la loai c^m bien chuyen dpng diing de xic djnh tdc 66 quay cua true dpng co. Cam bien toe do hi^n nay da s6 ho^t dpng dua tren nguyen t i c dem xung tfnh hl^u ddng bO vdi toe dp quay cua true ro-to theo nguydn tic quang, nguyen t^c dien c^m hay dien dung.
Tin s6 xung tfn hi^u thay doi theo toe do quay cua true cim biln, vl viy cic c^m bien chi co the tinh dupc toe dp khi cd td hai xung trd len. Vdi cac ro-le cd sd dung vi xCf ly hidn nay cic sU c6 tdc dp cao hay toe dp thap la co the lap trinh dupc. Khi si^ cd xiy ra, cac ro-le se gUi tin hieu bao loi thdng qua cic tilp diem r o l e tuong Ung. Cac ro-le loai nay cung cd t h i tu ddng loai b6 su co trong truong hop khai d0ng v i ddng bing.
3. c i m b i ^ n ldch bang
Cim biln l^ch bing duoc sd dung de phat hien sif ldch hay dao ddng ngang cua bang t i i trong qua trinh lam viec v i cung cip cic tfn hieu canh bao hay su co de dung bang.
Cim biln l^ch bing CO tac dung chong lai nhung suco gay nguy hai tdi bing hay he thong truyen dpng va tranh hien tupng hdn loan cua tuyen van tai khi xay ra su co.
Cim biln ldch bang thuong duoc bo tri tai duoi bang trUde khi bing di vio pu-li de di nguoc tro ve, diem dau bing phfa trudc pu-li va a khu vuc bang doi huong chuyen ddng. d nhdng bing co chieu dai Ion thi trong moi khoang 500m dpc theo tuyln can bo tn 1 cap cam bien lech bang (d nhdng trudng hpp dac biet thi khoang nay dupc xac djnh bdi nhi thiet ke)
Cim biln ldch bang co the su dung la loai cong tac co khf hoic cim biln khong tiep xuc (proximity). Tuy nhien trong mdi trUdng cdng nghiep mo thi cong tac co khidi/oc Ua dung hon.
Hinh 2. Ra-le tdc dd (trin) Cim biin tSc d^ kiiu tiim cin (dUdi)
Hinh 3 Cdng-tic 1^ bing kieu cakhi
4 . Ciim bi^n riich bang
Cic cim biln rich bang dupc thiet ke de bao ve bang khoi cic sued rich dpc rich ngang hay cac 16 thung tren bang.
Trdn 70% si/ c6 rach bang xay ra d diem nhan tai, xac xuit cdn lai dupc chia deu cho su co xay ra a cuoi bang va trdn toin bd tuyln bang. Do do cam bien rach bang can dupc bd tri d ngay sau diem nhan tai. 6 cac bang tai tren m i t bing khoing cich gida cac cam bien ke tiep la 100- 200m, khoing cich nay la 50-80m d trong dieu kien ham Id. Trong cic trudng hpp dac bien khoang each nay la 10- 50m (5)(6).
Cim biln rich bing hoat dpng dua tren nguyen taccO khi hoac didn td. d nguyen tac co khf cac edng-tac nhay dang diy keo (7) hoic dang dng dupc (6) dupc bd tri ngay phia dudi cua bing. Khi cd su cd rach bang thi canh cua cac
1
bing bj rich se va tram vio cic cdng tic niy lim cic cdng tic nay tic ddng. d cim biln dang didn td, cic vdng diy kim loai dupc dat chim dpc theo chilu dii ciia bang (5). Cie vdng diy nay cd tic dyng truyin cic tfn hidu didn td bd phin phit sang bp phin thu cCia cim biln. Khi bing bj rich vdng diy bj ddt thi tfn hidu khdng truyin td bd phin phit sang bd phin thu 6ugc.
CtnlixMltar'ita
Hinh 4 Cdm bOn rich bdng a. Dgng cdng-tic Sng; b. Dgng ddy kio; c.
Dgng diin tU
5. CSm bien un cap lieu
Cdng tic un cap lieu la mdt cdng tie an toan can thilt eho bing t i i . Khi vit lieu bj ket trong cap lieu, vat lieu se bj ddn d va day dan trong cap lieu. Khi mdc cua vat lieu trong ming vupt ngudng cho phep, cdng tic un cap lieu phii dUng lip tdc bing t i i bang tfn hidu sU cd. SU cd Cm cap lieu cd t h i lam hdng vat lieu dupe van chuyin, gay hai cho bing t i i hoac cd t h i giy chiy.
Cdng tic Cm cap lieu 6ugc bd tri trong khu vUc ming (pheu) rdt cua cap lieu 64 xic djnh sU cd khi mdc cua v i t lieu vupt ngudng cho phep.
Cim biln Cm cap lieu trong trUdng hpp dPn giin la mdt cong tic gidi han dUpc d i t trong hdc trdn thanh cua cip lieu hoic cdng tic thuy ngan (tilt switch Hinh 5b). Tilp dilm cua cdng tic gidi han sd tic ddng khi vat lidu bj Cm day v i tran vao hde bd trf t i l p dilm. Trong trUdng hpp edng tic thCiy ngin, v i t lieu Cm lam nghidng cdng tic va edng tic tic ddng.
TCiy theo dilu kidn mdi trudng, vit lieu ngUdi ta cd the sd dyng cic cim biln nguydn ly phdc tap khic. Cac cim biln vi sdng (microwave) va cim biln phdng xa tie ddng khi dudng ndi gida thilt bj phit v i thilt bj thu bj chin bdi vit lieu (Hinh 5a). Cim biln tidm can (didn cim, didn dung) tic ddng khi vit lidu trin vio vung tic ddng cOa cim biln lim thay ddi gii trj didn cim hay didn dung cua diu cim biln (Hinh 5d,e). Cim biln pd-dan tic ddng khi md-men tie ddng Idn tryc quay cCia ddng cP cim biln bj thay ddi do v i t lidu Cm diy chdn vio pd-dan gin vio tryc ddng cP (Hinh 5c). Ngoii ra ngUdi ta cdn cd t h i sd dyng mdt sd loai sensor do mdc v i t lieu rin 64 xic djnh sU ed Cm cap lidu v i t lidu.
6. Cdm bi^n muTc thung chufa - silo
Bio vd mdc cao trong thung chda hoac silo, trong cic trudng hpp mdc qui cao cd t h i giy su cd, ein 6ugc sii dung. Vide bio vd mdc trong thung chda hay silo eung sd dyng cic loai cim biln nhU trong mye bio vd Cm vat lieu cip lieu.
7. Ciim bien cdng bdng
Gidi han cing bing 6ugc bd trf d nhdng vj tri cUc dai cho phdp cua ddi trpng hay thilt bj cing bing. Khi cic thilt bj dd di ehuyin vUpt qua gidi han cua quy dao di chuyin cho phep thi tfn hidu sU cd can 6ugc xic lap.
d cic cic bd phan sddyng ddi trpng, sUcd gidi han trdn ed t h i l i do bing t i i bj ket. Su cd gidi han dudi ed t h i bj giy ra bdi bing bj cing qui, hay bing bj ddt. Vide vUpt qua quy dao di chuyin cua bd phin cing bing trong qui trinh khdi ddng t h i hidn he truyin ddng 6ugc thilt lip khdng phu hpp hoic bj sU cd.
Cd hai mdc bio vd d tai cac dilm xic djnh sU cd dupe gpi la gidi han cinh bio va gidi han sy cd.
Gidi han sy cd can 6ugc ndi vdi bd dilu khiln ddng cP 64 ddng sU cd thilt bj.
Phit hidn gidi han cinh bao can phii ddc lip vdi he thdng dilu khiln va khdng can thilt phii ndi vdi bd dilu khiln ddng cP ma chi can thilt bj cinh bio.
Cic cim biln cing bing thuc chat l i cac edng tic hanh trinh 6ugc bd trf tai cic vj tri gidi han cinh bio trdn, gidi han dudi cua quy dao di chuyin v i gidi han sU cd trdn v i sUcddUdL
8. Phat hien va bdo ve chdy
Cic cim biln bio chiy cd t h i 6ugc ydu cau trong cic he thdng bing t i i theo ydu cau cCia nha thilt k l trong nhdng dilu kidn xic djnh. He thdng bio chiy cd t h i la he thdng cac thilt bi ddc lip hay kit hpp vdi cic tfn hidu ddng khan cOa cic khda keo an toan d mye 1. Cic cim biln chiy khi tic ddng can loai bd ngudn didn cung cap cho bing t i i . 9. Thiet bi tdch tCr
Thilt bj tich td cd t h i 6ugc sii dyng khi can thilt 64 loai bd cac phan td kim loai (vit lidu td tfnh) khdi he thdng bing t i i . Thilt bj nay thdc chat la mdt nam cham didn lam vide ddc lap vdi cac thilt bj bao vd khic.
10. Cdc khoa an toan
Cic khda an toan 6ugc lip dat trong cic he thdng bang Automation Today / 4, 2012
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t i i de khdng eho phep bang t i i hoat ddng khi cie d i l u kidn an toan khdng dUpe d i m b i o . Cic t h i l t bj n i y thUe hidn n g i t eae ngudn cung cap didn cho hd thdng t r u y i n d^ng cua bang t i i , ddng he thdng b i n g t i i .
Cic khda an t o i n 6ugc bd tri d cic r i o c h i n , cda hay n i p day an toin.v.v l i nhdng t h i l t bi ddi hdi p h i i 6ugc ddng tuyet ddi trong q u i trinh hoat ddng eua hd thdng.
Cac khda an t o i n nay cung cd t h i l i cic t h i l t bj dung 64 xac nhan nhdng trang t h i i an t o i n cho hoat ddng cua he thdng vi du nhu tin hidu b i o phanh da 6ugc n h i , hd thdng bpm dau bdi tron da hoat dpng...
Cac khda an t o i n vi v i y ed t h i sd dung l i cic cdng t i c hanh trinh hay eie c i m b i l n tiem c i n .
12. Thiet bi dieu khien bang tdi
Thilt bi didu khien bang l i t h i l t bj chfnh 6ugc ndi vdi cac t h i l t bj c i m bien b i o vd nhu lech bang, cang b i n g , un vat lieu... va xic djnh loi khi sU cd siy ra. Cic t h i l t bj dieu khiln b i n g hidn nay hau h i t 6ugc thiet k l v i e h l tao dUa trdn nen t i n g vi xd ly hoac sd dung t h i l t bi d i l u k h i l n PLC.
Thilt bi dieu khien bang t i i thudng dupe bd trf cung he thdng dieu k h i l n ddng ep t r u y i n ddng. Thilt bj d i l u khien 6ugc k i t ndi vdi eie c i m bien b i o sU cd, cic cdng t i c lidn ddng va gdi cac tin hidu lien ddng, tin hieu d i l u khien he thdng.
6 trang t h i i binh thudng bd dieu khiln thuc hidn d i l u k h i l n theo cac quy trinh cdng nghd yeu c i u d muc 11.1.
Khi n h i n 6ugc tfn hidu sU ed tU cic t h i l t bj khac, thiet bj dieu k h i l n thue hidn vide xd ly theo cdng nghd, trong trudng hpp khan cap cd t h i l i p tdc ddng he thdng d i l u khiln t r u y i n ddng ddng cfl.
DiduA 13. Cdc thi^t bj phu tror khdc
T h i l t bj c i n h b i o khdi ddng la cac den hieu, coi l i p d i t dpc theo c h i l u d i i cua bang t i i . Cae thiet bj nJ 6ugc sd dung 64 c i n h b i o cho mpi ngUdi ve viec chuan b ehuyin ddng cua b i n g t i i de mpi ngUdi co the trani nhdng vj tri cd t h i g i y nguy hiem. Cac thiet bi canh b^o khdi ddng n i y c i n 6ugc bd trf de cd the de dang quan sal dupe v i nghe 6ugc trdn t o i n bp khu vUc l i p dat bang tii Tfn hi^u c i n h b i o p h i i 6ugc phat trudc khi he thong khdi ddng 20s v i duy tri tdi khi cd chuyen dpng tren toan bo h^
thdng b i n g .
Giao dien ngUdi m i y (HMI Human machine interface) cua he thdng d i l u k h i l n , b i o ve bang t i i can phai duocth^
hidn rd r i n g v i ddc lap cic thiet bi trong he thong deed t h i p h i n bidt chfnh x i c v i rd rang. Cic thiet bi dieu khi&
di^n t d thdng minh e i n p h i i duoc ket noi de duy tri ngu6n
nudi khi ngudn nudi cua ddng co bi ngit. J Trong cie hd thdng b i n g t i i khi co yeu cau, cac thiet bi
chdng dao dpng b i n g hay t u dong dieu chinh lech bang.
Cic t h i l t bj chdng dao ddng b i n g co the sU dung thiet bi thu ddng nhU con l i n g i i m chan hay thiet bi chu dong dung cic t h i l t bj g i i m c h i n dien tu. Cac thiet bi dieu chinh lech bang t u ddng d i l u chinh b i n g khi cd tin hieu phan hoi t U e i m b i l n ldch b i n g .
IV. K^T L U A N
Bai b i o trinh b i y ydu cau cong nghe cua viec tu dpng hda cho cac he thdng bang t i i va cic phan tu phuc vu cho muc dich n i y . Bai b i o chi ra chue n i n g va vi tri bo tri lap dat cua cic phan t d trong he thdng phuc vu cho tu dpng hoa t u y l n bang. Bing vide gidi thi^u tren, b i i bao mong muon cung cap thdng tin k h i i q u i t ve tu cong nghe tu dpng hoa b i n g t i i cho sinh vidn n g i n h t u d o n g hda xi nghiep mo va d i u khf eung nhu nhdng ky sd thiet ke, t u van. a
TAI LICU THAM KHAO
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(2). Nhieu tic gia,. Cac 66 i n tot nghiep dieu khien tudpng bing t i i .
(3). Anglo American. CONVEYOR BELT PROTECTION SYSTEMS.
2009, AA_SPEC_67301801.DOC.
(4). Debswana. Conveyor Belt Protection Systems. 2007, DS SPEC 673018.
(5). Becker Mining System.
http://www.becker-mining.com.http-.//www.beckei-
mining.com/runtime/cms.run/doc/English/733/Belt_Rip_Detec tion_System.html. [Online]
(6). Masushima Corp. Tear accident detection for conveyor belts - Belt tear dectector.
(7). Electric Control. Conveyor belt detector, s.l.: Electric control
Hmh 6. Thiit bi diiu khien bang tii
a. Thiit bj diiu khien cda CT-system b. PLC
