Thdng tin khoa hpc cong nghe m o
PHUONG PHAP XAC DINH GOC DOC CUA LO CHO CO Gidl HOA K m KHAI THAC VIA DOC NGHIENG
TS. PHAM TRUNG NGUYEN Vidn Khoa hoc Cdng nghd Md - Vinacomin So far, the mining flowsheet of the longwall advancing on
strike with using hydraulic single props, hydraulic beams or movable wpporting frames have been mainly applied to the gentle dip to inclined coal seams at the underground coal mines. For meeting the demands on the coal production and ensuring the labor safety, at some underground coal mines, the technology for coal mining mechanization has been applied to the above mentioned coal seams. The paper introduces the method for determining the dip angle of the mechanized longwall when carrying out the inclined coal seam mining activity
Tgi eac md than hlim Id vCing so nay se anh hu-eng d^n kha Quang Ninh, d6i vd'i cac vfa nang tam vi^c eua thi^t bj. Do
than cd gdc doc thoai den dd, khi li^a chpn hudng khau giOa Id chp vd Id dpc via khdng nghieng, chd y l u dp dyng sc eua Id chp c^n xem xet sy dnh vudng ke. Trcng cdc se d6 khal d6 cdng ngh§ cOt ddi thee hu-eng cOa gdc d6c d6c via vd
phucng, ch6ng giCr bang cpt gdc Id chp xien cheo.
thuy li/c den, gid thuy li/c ho$c Ban chit cua vi0c thay d6i gid khung thuy li,j'e di ddng. hudng khlu Id xoay Id chp mdt Nhung nam gan ddy, de ddp gdc y so vci dud'ng phueng U'ng nhu c^u tdng nhanh sgn cua vfa d l gdc d6c Id chp' bdn
lupng than vd cai thipn dilu xien (aic) nhd hen gdc d6e thgt .., ^ . _ . ^ . kipn lao dong, mpt s6 md dd dp cua via (ov) {hinh 1), khi dd d l u cua Id ehc, ddn hoac gid dyng cc gici hda khai thde theo gucng Id ehc nghieng m0t gdc thuy lye cd xu hudng djch sc d6 cdng nghp cpt ddi theo 5 tueng ung (hinh 2). chuyen vdo Id dpc vi"a, c d l u phueng tgi nh&ng via than^d6c jrong thye t l , vdi khu vyc cdn lai thi Igi thilu ddn ch6ng thoai den nghieng. Thye t l dp rupng md da dupe chuin bj giO' ndc Id che. D i l u nay d i n dgng trong nh&ng ndm qua tgi theo se do cdt ddi theo d i n tinh trgng phdi thdo vd ede Id ehc ec gidi hda cho thiy,
•< j - ~ , \ /:-A ,^^
phucng. vide xoay bdn xidn Id che gap nhilu khd khan do gdc
thae ept ddi theo phucng hole cpt ddi theo hudng doe. gdc glO'a 16 ehc vd Id dpc vfa hogc vdi Id thueng duec khuyin cdo la gdc vudng hay g i n vudng.
Khi gdc ndy khong vudng. sau mpt s i ehu ky khai thae. d mpt
vdi gdc d i e vfa cdng Idn. cdc ddn ching cdng cd xu hudng bj xd idch theo hudng d i e d i n d i n khd khdn trong vipc di ehuyin vd cdn chfnh cae ddn.
o l giai quylt v i n d l ndy. cdc md thydng dp dgng cae iogi ddn ehing cd ce c l u ching trdi truet k i t hep vol xoay Id che xidn chdo so vdi dudng phucng cua vfa. M l i day chuyin thilt bj khai thdc Id ehc ed trj s i gdc die lam vide toi da theo phucng vd theo hudng die ridng bidt. Nlu vuet qud tr{
(-'-?VT?
y - Gdc xoay bdn xidn cQa Id chi? aic - Gdc ddc cOa Id chQ;
or„ - Gdc dSc cOa via; Op - Gdc dSc theo phtiong.
Hinh 1. Hinh d^ng chung cOa Id chQ bdn xidn.
KHCNM S 6 4/2013* CNKT HAM LO
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Thong tin Khoa noc cong ngne m o^^%
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ain rg^^^
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5=b»fi!WgdcxoayM;ix»ny = D"; 5 ^^(khigdcmaybin xidny fCf) ) H/n/i 2. /W|( cat ngang ciia » cho khi xoay bin xidn.
Hlnh 3. Sa do nguyin If xic dinh mdi quan hi giOa gdc ddc cOa Id chg aio, gdc nghiing cua gwang id chg'5 vdi gdc xoay bin xiin y vi gdc ddc cOa via Ov.
chuyin gia, ddn ehing hogc vl chong "thCrg" d d l u Id ehc ndy d i n lap dgt d d l u kig 16 che, khi dd. Id che phai dOng d l thye hipn edng tdc nay gay anh hueng d i n eac ehf tidu kinh t l ky thugt. D l khdc phuc tinh trgng trdn, c i n thay doi sc do chuin bj khu vyc khai thdc Id che, 16 dpc vfa tre thdnh 16 dpc vfa ban xidn (Id thueng) vdi gdc dec bang gdc nghieng gueng 16 che 6. Tgi ddy, xay ra 2 trueng hep 16 che cd hudng cam xulng duel vd hudng d i e Idn tren. Vdi mdi mpt trydng hcp d l u cd uu, nhuec d i l m ridng.
Khi 16 che c6 hydng cam xulng dudi d l l vdi vfa than
day khai thdc hg trln su dung kilu ddn chdng cd cua thu h l l than phia trdn nhu kilu dan Vinaalta hipn dang dp dgng tgi md Vang Danh. Nam M l u se cd yu dilm v l mgt thodt khi (do khi mdtan khdng tap trung lai e gycng Id che), thu h i i than ha trln (do hudng xulng dudi nen dra s i thao than se c6 didn tich tang Idn dan den thu h l l than hieu qua hen) nhung nhuec diem neu via than nam trong khu vuc cd nhieu nude, tnj vfa khdng I n djnh se gdy tinh trgng Idn nln. khd khdn eho cdng tde di chuyen dan chong, ngodi ra nude c6 tinh axit anh hydng tdi tuli thp va dp tin cdy khi Idm vide cua cac thiet bj trong 16 ehc.
Khi 16 che hydng d i e len trdn se thodt dyec nudc d gucng 16 che. trdnh duec hipn tueng ndu trdn nhung ngucc Igi. he s i thu h l l than hg trln giam do dign tich cyg so thdo than giam, tang tf Id t i n that than, ciing vdi dd khi mdtan tich tu eao c gueng Id che g^y nguy hiem ve n l khi mdtan.
Md hlnh hinh hpc khdng giat\
(hlnh 3) dyec xay dyng vdi mgc dich xdy dyng m l i quan hd glO'a gdc xoay bdn xidn ciJa Id che y vdi gdc nghieng gueng 16 ehe 5. gdc d i e cua 16 che oic, gdc d i e thgt cOa vfa QV.
Trong hlnh 3, mgt phing vfa than Q hep vdi mgt phang nam ngang P mdt gdc a,. Tren mgt KHCNM sd 4/2013* CNKT H X M L 6
Thong tin khoa hpc cong nghe mo
phing vfa than Q, 16 che BD khi chua ducc xoay ban xidn sd cd gdc d i e Ov b i n g gdc d i e cda vfa than Q. L6 che BD khi ducc xoay 1 gdc bdn xidn y sd trd thanh 16 che DC mang gdc d i e ale. Gdc nghidng cua gueng 16 ehe 6 (hlnh 2) se bang vdi gdc cua trg vfa so vdi mdt phing nam ngang tgi mgt eat 16 ehe do ddy Id 2 gdc cd cgnh tueng dng vudng gdc va trdn hinh 3, nd ducc the hidn Id gdcAED.
D l tim ra m i i quan hd glO'a gdc xoay ban xidn eua Id ehc vdi goe nghidng gueng 16 ehc, gdc die eua Id ehc vd gdc d i e thdt cda vfa, se xem xdt cdc t u dipn ABCD. ABDE. ACDE.
Trong tam gidc ABD ta xae djnh ducc: DA X
s i n a = = — ' BD L hay X = L. sinov
Trong tam giae BCD tueng tycd: BD _L
hay L,= -
Tueng t y trong tam gidc ACDcd
X sin a^l
sinait. = • - = — J — cos/
Hay sin a t = sina..cosy (1) Tueng t y vdi each tinh trdn.
tim ducc m l i tueng quan glO'a gdc nghidng gycng Id che 6 vd gdc xoay bdn xidn nhu sau:
sin 6 = sinov. siny (2) TCi'cdcbiluthuc(1)va(2).
xdy dyng duec bllu d l t h i hidn sy phg thudc cua gdc d i e Id che aic, gdc nghidng gycng Id che 6 vdo gdc xoay bdn xidn y. Bllu d l phg thudc dd dyec
. Swphu thudc cua gdc ddc Id cha an so vdi gdc xoay bin xiin Id cha Y vdi nhOng gdc ddc via than dv khic nhau.
Hinh 5. Swpht,! thudc cOa gdc nghiing Id chg 5 so vdi gdc xoay bin xiin id chg y d nhOfng gdc ddc via than Ov khic nhau.
the hidn c hlnh 4 va 5. Cdc k i t qua trdn eho thay.
Tir eac bllu dd trdn thiy gdc nghidng gucng 16 che (6) ty rang, n l u gidi hgn gdc nghieng '# nghjch vdi gdc die cua Id che guong Id che 6 = 10° vdi cac ban xidn (at). Do vgy, tiiy theo vta than cd gdc die Ov l l n luct ^ ^ u kidn dja ehit. ky thudt md la 14° 22° 26°. 30° thi gdc die <^ "^^ 'W^ ^ ^ n gdc xoay ban xidn cua 16 che hep ^ d l tang hidu qua khi tiln hdnh khai thdc thgt cua Id che aic giam xuong
cdn lln luct la 15°, 19°, 24°, 28°
tueng u'ng vdi cdc gdc xoay y la 36°,28°, 24°, 21°. Cdn trueng hep gdc nghieng eua gucng Id che 6 = 15° thi gdc d i e thgt eua Id che ale gidm xulng cdn l l n luet la 9°, 16°, 21°, 25°, tueng ung vdi cdc gdc xoay y Id 56°,
vfa than dde nghidng./.
Til ll^u tham khio 1. Nguydn Anh Tuin, NhO' Vidt Tuin. Ld Van Hgu "Nghien ciru lya chpn cdng nghd ce gidi hda khai thde eae vfa than day, d i e trdn 45° tgi cdc md h i m Id viing Quang Ninh". tr 90 -94.
44°. 36°, 32°. K i t qua Id goe j^,^^„ ,^p ^^ ^„g ,,,„(, ^^^
d i e eua 16 ehc ale giam t y 2 y,^^ ^ ^ pg^^ gjgj aogn 2007- d l n 9° vdi 6 = 10 - 1 5 ° . 2012, NXB Cdng Thucng, 2012.
KIICNM .SO 4/2013* CNKT HAM LO