KHOA HOC VA
C O N G N G H S M 6CNM
LUA CHON CO HAT DAT DA HOP LY
• • • •
KHI sir DUNG BANG TAI VAN TAI
CHO CAC MO LO THIEN LOTN QUANG NINH
ThS. 0 6 NGQC Tl/6C, KS. BUI DUY NAM, KS. VO O I N H TRl/dNG - Vign KHCN Md-Vinacomin
^ | i rong thdi gian tdi, cdc md than Id thidn Idn I vung Quang Ninh se ndng khii lugng dlt bdc
"^ hdng nam cua mdi md len 20+30 trm%dm, than khai thdc tu 2,5+4,5 tr tin/ndm. Cung dd vdn tai dlt da se tang tdi 7+10 km, chilu eao ndng tai tu 300+500 m. Nlu su dyng vgn chuyin dlt dd bang d td thuln tuy gia thdnh se cao. Vide su dyng cdng nghd van tai lien hgp: d td-bang tai; d td-trye tai, d td-cap treo... se giam chi phf vgn tai do phdt huy dugc cdc uu diln cua tung dgng van tai. Mdt trong nhung cdng nghe vdn tai mang tfnh kha thi cao dd la van tai lien hgp d td, bang tai.
Khi van tai blng bang tai, dlt da cin phai dap nghidn tdi cd hgt dam bao qua trinh van chuyin an toan vd hieu qua. Cd hgt lya chpn doi vdi bang tai la cd hgt Idn nhlt chu khdng phai Id ed hgt trung binh nhlm muc tieu dgt dugc hidu qua vd dam bao an toan khi hogt ddng. Vdi mdt loai bang da chpn, khi ed hgt tang, ndng suit hidu qua cua bang tai se giam nhlt Ngoai ra, vdi mdt khii lugng van tai yeu clu khi cd hgt tang, b l rdng bdng tai eung tdng len.
Mat khae kich thudc cd hgt anh hudng rit Idn din qua trinh lya chpn con lan. Hiep hdi cdc nhd san xult bang tai (CEMA) da gidi thidu quan hd giua b l rpng bang tai cin thilt B vdi cd hgt dlt dd Idn
n h l t dmaxn-
Qua hinh H.1 cho thiy, khi cd hgt dlt dd tdng thi b l rdng bang tai eIn thilt B cung tang vd muc tang phy thudc vao chl tieu gdc chit tai dlt dd trdn bang.
Nhu vgy vdi logi dlt da sau nghiln ddp tgi Quang Ninh cd gdc nghi tu 20+29°, durig trpng tu 2+2,2 tln/m^ kill lya chpn bang tai cd b l rpng 200 cm thi cd hgt dlt da Idn nhlt la dmaxn=40 cm.
o l dam bao cd hgt clp lieu Idn nhlt cho bdng tai < 40 cm eIn thilt phai su dyng nghiln dap tgi cac vj tri thfch hgp trong md.
Cdng nghe nghiln dap dugc thyc hien dya tren 4 nguyen ly co ban la dap, mai, cat vd ndn dp. T i t
ca cdc logi mdy nghiln dugc chl tgo diu kit hgp mdt s l trong cdc nguydn ly tren.
• Nguydn ly su dyng lye ddp: la each thuc dijng bua ddp nghiln vdt lidu bdi tac dyng trpng lye.
• Nguyen 1^^ mai mdn: Id each thuc lam giam kich thudc vdt lidu bdi sy chd sat vat lieu bdi hai b l mat cung. Bua nghiln hogt ddng chat che giua bua vd thanh sdng Idm giam kfch thudc vat lieu kit hgp vdi luc elt. Mac du nguyen tic nay tidu hao nhidu nang lugng vd logi may nghiln nay thyc sy cd trpng lugng ndng hon bdi vide b l tri bua vd thanh sdng nhung phij hgp vdi nhung vat lieu ft
mdi mdn nhu da vdi hodc than.
• Nguyen ly su dyng lyc elt: co c h l cdt bao gdm hogt dpng elt hogc che vat lieu hon Id hogt ddng mai mdn. Su dyng lyc elt thudng k i t hgp vdi cdc nguyen t i e khdc d l dem Igi hieu qua cao hon.
• Nguyen ly ndn dp: nhu ten cua nguyen tic nay vide nghiln vdt lieu dya vdo sue ndn dp. May nghiln ham su dyng nguyen tic ndy vd phu hgp vdi nghiln cdc logi da eung vd ed dp mdi mdn cao.
50 45
b
|25 JZQ
is m
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s5;is?5s
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45 60 180 200 220 B,(
H.1. Quan h$ giUa ea hgt dit di l&n nhat sau nghiin (dmaxn) v&i bi rdng bang tii (B): 1 Gdc chat tai 2(f; 2 - Gdc chat tai 3QP.
C 0 N G N G H I I P M 6 S 0 6 - 2 0 1 1
CNM KHOA HQC VA
C O N G N G H C M 6 Theo nghidn cuu mdi ddy cua tiln sT HelmutOberrisser thupc Tdp dodn Sandvik-Australia, mli quan hd giua ndng suit thdng qua vdi d0 cung cua dlt da eua hlu hit cdc logi mdy nghiln ddp dugc t h i hidn d hinh H.2.
Nang sufi thdng qua, T/h 14
50
•-..u
100 150 DdcOngd&td^MPa
200
H.2. Mdi quan he giua ning suit vi dd eung dit di v&i mgt sd logi miy dgp phd biin Odi vdi dlt dd vijng Quang Ninh cd dd eung
>150 MPa, dp bin kdo, dp mdi mdn cao cin lya chpn logi may dap ed t h i kit hgp dugc cdc nguyen ly pha vd blng dap, elt vd mdi mdn. Mpt trong nhung logi may dap dap ung dugc cdc ydu clu tren Id may dap cdn (dap ndn) hodc mdy nghiln tryc thuy lye.
Vin d l quan trpng Id vdi kich thudc dlt dd sau nghiln Idn nhlt dmaxn=40 cm thi cd hgt dlt dd diu vdo may nghiln la bao nhieu. O l xdc djnh cd da diu vao eho may nghiln ed t h i dya vdo gia thilt cd hgt cd dgng hlnh clu, b l mgt tryc nghiln cd dgng tron (hlnh H.3).
H.3. Cic thdng sd nghiin eua miy nghiin tnjc V&l may nghiln tryc cd ban kinh vd chilu ddi tryc tuong duong, dudng tilp xue cua hgt nghiln va 2 tryc tgo thanh gdc k^p 0. Tu quan hd hinh hpc d hinh 3 ed t h i tfnh todn kieh thudc cd hgt Idn nhlt clp vdo mdy nghiln (D^ax) nhu sau:
2R(1-C0Seofd^axn . „ , (1)
^n\ax~'
cos6 cm
Gdc kgp 6 phy thudc vdo hd s l ma sdt p giO'a b l mdt tryc nghiln vd hgt d l t dd dua vdo nghiln qua quan hd |J=tg9. Vdi k i t c l u tryc nghiln blng thdp, hd s l ma sdt |j gida thdp vd d l t da cd thi giao dOng tu 0,2- 0,3 hay 9=11+17° Tu do dudng kinh cd hgt Idn nhdt c l p lidu cho m^y nghiln tCiy thudc vdo bdn kfnh tryc nghiln dugc tfnh todn d bdng 1.
Bing 1. Kich thu&e e& hgt l&n nhit cap ligu va bin kinh tnjc nghiin (p=0,3)
TT 1 2 3 4 5 6 7 8 9 10 11 12
R,
m 35 50 65 80 95 110
125 140 155 170 185 200
Dmax. nri 1
45 .m 46
47
:49
50 52 53 54
55 J
57 58
^
':3f
60 j
Clii phf, d/m3 300
0,0 0,2 0,4 0,6 0,8 1,0 i m
•4- dc+Qn -•- Gxiic(E=6.7m3) •*- Gxuc(E=10m3) -•-G6(<pS8tan)HK-G6(q=91tan) _ _ , ^ H.4. Quan h$ giua chi phi khai thic quy chuyin 1 n^
dit di theo kk:h thu&e ea hat trong cic khiu cdng ngh$: 1 - Khoan; 2 - Nd; 3 - Xue bde; 4 - Van tii dtd
Dk xdc djnh cd hgt hgp ly cho todn bp day truyin san xult tren md Id thien khi su dyng vdn tai lien hgp d td-bdng tai c i n thilt ldp cdc anh hudng cua thdng s l khoan, n l min, chit lugng dap vd dit dd d i n cdc chl tieu kinh t l ky thudt cdc khau san xult ridng bidt trudc khi c l p lieu vdo may nghiln.
C0NGNGHI£PM6S06-2OII
KHOA HOC VA
C O N G N G H £MO CNM
Oilu dd dugc tiln hdnh trdn co sd so sdnh chi phi d l lya chpn ed hgt no min toi uu tiln hdnh theo cdng thuc:
ZG=Gkn+Gx+G6 -^ min (2) Trong dd: I G Tdng ehi phf quy chuyin, d/m^ Gkn,
Gx, Ge, Tuong ung chf phf khoan n l , xuc blc, van tai dtd.
Tgi cac mo than lp thidn vung Quang Ninh, khi su dyng mdy khoan cd dudng kfnh d=230-250 mm; eae t l hgp may xuc thuy lye cd dung tfch gdu xuc E=6,7 m^+d td tai trpng 58 tin vd t l hgp mdy xue cd dung tfch gdu xiic E=10 m^+d td tai trpng 91 tan, chi phf cdc cdng dogn khoan n l , xuc blc, vdn tai dugc t h i hidn trong bilu d l H.4.
Qua tfnh todn thiy ring: Khi tang ed hgt tu 0,4 m len 0,6 m chi phi khoan n l (dudng kinh l6 khoan tu 230+250 mm) giam khoang 30 %; chi phi xuc blng may xuc ed E=6,7 m^ tdng gin 50 %; chi phi xuc t)lng mdy xue E=10 m^ tdng 20 %; ehi phf vdn tai blng d td (q=58 tin) tang 11 % vd chi phi vdn tai blng dtd (q=91 tin) tdng 4 %. Tu dd, vdi dlt dd vung Quang Ninh, ed hgt dd nd min Idn nhlt Id dmax<60 em.
K i t luan
Cd hgt dlt da nd min Id chl tieu ky thudt quan trpng anh hudng din todn bd day truyin san xult tren md. Khi su dyng van tai lien hgp d td - bang tai thi cd hgt dlt da Idn nhlt dugc tinh toan theo yeu clu eua van tai bang tai. Vdi bang tai B=2 m lya chpn mdy may nghidn kilu dap cdn (ddp ndn) hogc may ddp tme thuy lyc dam bao cd hgt sau nghiln <40 cm.
Vdi ding bO thilt bj mdy khoan d=230-250 mm;
mdy xue cd dung tfch gdu E=6,7+10 m^; d td tai trpng q=58+91 tin cd hgt dlt dd Idn nhlt d p lidu cho mdy nghiln <0,6 m
Cdng nghd vdn tai lidn hgp d td bdng tai Id cdng nghd tidn tiln cd gid thdnh cdng dogn thlp. Tuy nhidn vide lya chpn cd hgt dlt dd vd mdy ddp hgp ly cd vai trd quylt djnh tfnh kha thi cua cdng nghd cung nhu qud trinh sdn xult md.G
TAI LI$U THAM K H A O
1. Equipment Manufacturers Asociation. Belt conveyors for bulk materials. 2002.
2. Helmut Oberrisser, MBA, Fully mobile crushers as part of total IPCC solutions.
3. Fenner Dunlop. Conveyor handbook.
4. Oo Ngpc Tudc. Nghidn euu ddnh gid lya chpn phuong dn vgn tai dlt dd hgp ly cho md Odo Nai sau ndm 2010 din kit thue. 2011.
Ngudi bien tgp Ho ST Giao
SUMM The paper analyse
biggest proper rock g r a f r f g ^ t t ^ n e ^ n v e y e r width; Basing on thise, theTauthpral^llcwIater choose the biggest proper rock grain size after the blasting work to supply to the mucl{ing, transpolating and other work in open pit mining In Quang Ninh area.-
MOT PHUDNG PHAP GIANG DAY..
m •
(Tiep theo trang 40)
• Khi hpc vien dugc phat bidu vd ling nghe, hp bilt minh dugc tdn trpng va dua ra nhung nhdn xdt hogc ddng gdp eIn thilt cho giang vidn d l giang vien lam t i t hon cdng vide cua minh.
• Sau qua trinh hpc, hpe vien cam thiy hdng thu, phin chin ed them ddng lyc de thay dii mdt dilu gl do tit hon hogc lam tit hon cdng vide eua minh.
• Hpc vien chu ddng bilt nhung gi gido vidn cung clp thanh kiln thue vd kT nang cua minh, minh cd t h i su dyng trong cdng vide hang ngdy gin vdi cdng tac an toan.
Tit ea nhung phan ung tich cyc dd cho thiy viec dp dyng phugng phap giang dgy khuyin khich dugc sy chu ddng cua sinh vien s§ mang Igi kit qua kha quan, nang cao hieu qua cua chuong trinh
"ty chu an toan".n
Ngudi bien tgp: Nguyen Cinh Nam
SUMMARY
Conducting self-safety requires self- recognise of dangers and potential risks, which are not self born but accumulated in the duration of studying, training and working. When learners are motivated to be Infinitive and positively join into training programs, their drive the training course to high effectiveness. This article introduces a method in training program which has been being used widely in Germany and seems to be suitable with Vietnamese mining industry.
C O N G NGHIEP MO SO 6 - 2 0 1 1
