Tap chi KHKT Mo Bia chdt, sd30, 4/2010 S 52 XAC DINH CAC THONG S6 CO BAN CUA MANG CAO TRONG TO HOfP THIET BI KHAI THAC THAN LO CHO MO HAM LO DANG TRAN VIET, Truong Dgi hgc Md Dia chdt TA THI THUY LINH[.]
Tap chi KHKT Mo - Bia chdt, sd30, 4/2010 S-52 XAC DINH CAC THONG S6 CO BAN CUA MANG CAO TRONG TO HOfP THIET BI KHAI THAC THAN LO CHO MO HAM LO DANG TRAN VIET, Truong Dgi hgc Md - Dia chdt TA THI THUY LINH, Cdng ty Cd phdn V-TRAC Tdm tat: Dua tren nguyin tdc ddng bg hod td hgp thiit bi khai thdc than Id cho md hdm Id di xudt phirong phdp xdc dinh cdc thdng sd co' ban eua mdng edo nhu ndng sudt yen can kich thudc cdu mdng, cdng sudt trgm ddn dgng, chiiu ddi mdng edo Kit qua tinh todn lao thuan Igi cho cdng tdc thiit ki ehi tgo hoac lira chgn su dung mdng edo td hgp thiet hi khai thdc than Id ehg phii hgp vdi diiu kiin khai thdc mo hdm Id Viet Nam xuat d cac md ham Id Viet Nam phu thuge vao I Mddau su ddng bd cac thilt bj phan td hgp Mang cao dugc diing chu yeu de van tai Tinh toan cac thdng sd co ban ciia mang than Id ehg Id ndi va Id dgc via be cao la cdng viec can thiet thiet ke che tao thdng khai thac ham Id via ddc thoai va hoac lua chgn sir dung mang cao lam viec nghieng Mang cao dung td hgp thiet bi td hgp thiet bj khai thac than Id ehg Xac djnh khai thac than Id ehg ggi la mang cao td hgp cac thdng sd co' ban ciia mang cao can can cir (hinh 1) Mang cao td hgp cd cac doan cau vao dac tinh ky thuat cua may lien hgp, vao loai mang quay tuong ddi vdi khdng can thao rdi va khdng phai diing may di chuyen tien vi chdng sir dung td hgp, vao so' dd lam guong theo tiing dai khau, nen thudng dugc ggi viec cua may lien hgp la mdt chieu hay la mang cao udn thoi Dac diem co' ban ciia cac to hgp thiet bj khai thac Id ehg' cd mang cao udn Tuy thudc vao loai thiet bj chdng vach via ma td hgp thiet bj khai thac Id ehg cd the thuc hien co' gidi boa tiing phan hoac co' gidi hoa toan bd qua trinh khai thac md Td hgp thiet bj khai thac Id ehg cd may lien hgp - mang cao udn dugc diing de co' gidi hoa khai thac md, via ddc thoai va nghieng 25°, than cd kien co trung binh, pha boa toan phan May lien hgp Tram dan dong; Thiet bi keo cang ,\ich: hien cd kha nang thay ddi cao lam viec Xich keo; Thanh gat; Cau mang theo hai loai, loai khai thac via mdng chieu day Hinh Mang cao dimg md ham Id til' 0,5 - 1,3 m, loai khai thac via day tir 1,3 3,5 m va theo kien cd ciia than khai thac Ngoai chirc nang van tai, mang cao udn cdn ma tdc di chuyen may lien hgp dugc thay cd the dugc diing lam khung dan hudng cho ddi pham vi rdng tii' 0,3 - 0,8 m/s [4] may lien hop di chuyen dgc Id ehg Co gidi hoa Thiet bj chdng giu' Id ehg cd the la he vi chdng di chuyen mang cao tien guong nhd he kich don thao tac tbii cdng, hoac la vi chong co thuy luc nam ngang tac dung dgc theo than hoa tu hanh mang cao hoac nhd vi chdng thuy luc tu hanh 2.1 Khi Id ehg dugc chdng giu hiing vi chdng di chuyen kieu co' cau buoc don Td hgp thiet bj khai thac than Id ehg dugc Khi Id ehg dugc chdng giu bSng vi chdng thiet ke che tao theo nhieu chung loai, dua tren don thi chi co gidi hoa khau tach than khdi via dieu kien dja chat md, the nam va chieu day via dap vd cue Idn va chit len many cao May lien khoang sang Hieu qua su dung td hgp thiet bi hgp khai thac than Id ehg dugc pi, ihanh mav khai thac than de tang san lugng va an toan san 48 khau rdng va ma} khau hep Loai ma}' lien hgp cd the khau mdt dai than rdng hon m ggi la may khau rdng nho hon m ggi la may khau hep Di chuyen mang cao vao guong Id theo chieu rdng dai khau tuong ung vdi bude lap dat vi chdng Id ehg bang thii cdng So dd td hgp thiet bj khai thac than Id ehg diing may lien hgp - mang cao udn lap dat vi chdng don neu d hinh a Khi khau rong: b Khi khau hep: I May lien htrp; Mang cao uon: Col chong pha hoa cao Id ehg, ludi bao rach vao guong id de hot mdt Idp than mdng, vdi dai khau khoang 0,05 - 0,15 m Mang cao dich chu}en vao guong Id ehg nhd he kich thuy luc da} cac doan cau mang theo toan bd chieu dai sau mdt dai khau Khi Id ehg da cd chieu rdng bang mdt bude pha hoa can dung cdt chdng gan guong di chuyen cac cdt chdng pha boa va thu hdi cac cdt chdng lgt vao khoang trdng da khai thac 2.2 Khi Id ehg dugc chdng giir bdng vi chdng CO hod tu hdnh Khi diing vi chdng co' hoa (vi chdng thuy luc) tu hanh ket hgp vdi ma} lien hgp khau hep lam viec hai chieu khdng can dao budng khau dau Id ehg thi td hgp thiet bj thuc hien co' gidi hoa toan bd qua trinh khai thac than Day la cdng nghe khai thac md tien tien cd nang suat cao va an toan Mang cao udn di chuyen tien guong dang sau ma} khau nhd vi chdng thuy lire, tuong irng vdi chieu rdng dai khau khoang 0,4 - 0.63 m Td hgp thiet bj khai thac than Id ehg diing may bao - mang cao udn ket hgp vi chdng thu} luc tu hanh cho phep co' hoa toan bd qua trinh khai thac than (hinh 3) Hinh So dd td hgp thilt bj khai thac than Id ehg diing may lien hgp - mang cao udn lap dat vi chdng do'n Khi dimg may lien hgp khau rdng cd dai khau cang Idn thi dien tich Id vach viing udn ciia mang cao (phan gach cheo) khdng dugc dat cdt chdng cang Idn cdng viec lap dung cac vi chdng thii cdng cang nang nhgc va nguy hiem Khi dimg may lien hgp khau hep thi tdc tiln guang nhanh dien tich Id vach nhd se dugc chdng giu nhanh chdng va de dang hon khiu rdng nhd lap cac xa cdngson tua tren cdt chdng phia sau mang cao Do dd, td hgp thilt bj khai thac cd may lien hgp khau hep vdi bude di chu}en tien guong nhanh cang dugc diing rdng rai va da thay the dan ma} lien hgp khau rdng Ma}' bao dugc xem nhu may lien hgp khau hep lam viec iheo so' dd hai chieu len va xudng ddc, cd mang ciio udn ket hgp vdi vi chdng co hoa Khi chusen ddng dgc theo khung mang Hinh Td hgp thilt bj khai thac than Id ehg diing may bao - mang cao udn ket hgp vi chdng thiiy lire tu hanh Cac thdng sd co' ban ciia mang cao td hgp thiet bj khai thac than Id ehg Cac thdng sd co ban cua mang cao lam viec td hgp thiet bj khai thac Id ehg md hSm Id gdm cd nang suat yeu cau kich thudc c§u mang, cdng suat tram dan ddng, chilu dai lam viec ciia mang cao 3.1 Ndng sudt yeu cdu Mang cao lam viec td hgp chn dam bao nang suat yeu cau bang nang suit Idn nhit ciia may lien hgp theo so dd lam viec thuc tl 49 Nang suat thuc te cua may lien hop tinh theo [4] Qm = 60 m B Vm Y- ksd, t/h (1) dd: m - chieu day ldp than dugc ma} lien hgp tach pha khoi via m; B - chieu rdng dai khau, m; Vm - tdc di chuyen ciia may lien hgp, m/ph; -/ - khdi lugng rieng cua than khai thac t/m^; ksd - he sd dac trung cho muc su dung may lien hgp theo thai gian, tinh theo [4] van tai bang mang cao ma} lain \i iheo - hanh trinh thuan QVC = 60Q,„.—'— '• hanh trinh nghjch Q'\c = 60Q„ k [1] Thiy rang Q\c < Q V "^" nang suat yeu ciu CLia mang cao lam viec td hgp thiet bj khai thac Id ehg cin liy theo gia trj d hanh trinh khau nghich (2) T„, + T,+T,+T,, Q = Q".c=60Q„,-^.t/h (4) v k, - L Tir (4) nhan thiy ring td hgp cd may khau vdi: kki - he sd ky thuat dac trung cho tin cay chuyen ddng thoi chi cd kha nang lam viec lam viec ciia ma} lien hgp gia tri khoang binh thudng gia trj kv Idn (may khau chain) 0.82 - 0,93; Tmn - thdi gian thuc hien cac thao tac mano' nha cap chuyen cdt neo cap keo cang Trong trudng hgp gia trj kv nhd nang suat yen cap di chuyen may lien hgp; Td - thai gian thuc cau ciia mang cao tang rat Idn Dac biet neu k^ hien cac thao tac dau cudi Id ehg, gdm cd = thi d hanh trinh khau nghjch tdc tuong chu}en may tir trang thai khau sang chay khdng ddi V = td hgp khdng lam viec dugc binh tai va ngugc lai quay vdng may, thay ddi chieu thudng vi diem chat tai di chuyen cirng tdc tac ddng bd phan cat than, dich chuyen may vao vdi xich mang cao, vat lieu ddn ddng lai va tran ham khau: Ttr - thdi gian thuc hien thay the cac ngoai mang Khi td hgp cd may khau tdc rang mdn hong ciia bd phan cat than; Tsc - thdi nhanh (may bao than) thi kv < 1, d hanh trinh gian sira chua khac phuc su cd hu hdng may khau nghich than dugc chat len mang cao lien hgp va cac thiet bi td hgp (ph); nhieu ldp Qua nghien cuu cho thay rang gia tri L - chieu dai Id ehg m; v,,, - tdc di chuyen he sd tdc tuong ddi kv = 1/3 la tdi uu, vi dd nang suat yeu cau ciia mang cao bang nang maylien hgp m/ph Vdi td hgp cd may lien hgp lam viec theo suat may khau SO' dd thoi tach pha than va chat tai len 3.2 Kich thudc cdu mdng Nang suat van tai ciia mang cao tinh theo [I] mang cao thi khdi lugng than dugc mang cao Q = 3600 Fvi y v , t/h , (5) dua khoi Id ehg se thay ddi tuong ung vdi hanh trinh thuan va nghjch ciia may Khdi dd: Fvi - dien tich tiet dien ngang ciia ddng lugng dd phu thudc vao tdc chuyen ddng vat lieu mang, m"; -y- khdi lugng rieng ciia vat lieu van tai, t/m^ v- tdc chuyen ddng tuong ddi giua ma} lien hop va xich mang cao tuong ddi giua may lien hgp va xich mang cao Tdc chu}en ddng tuong ddi giua may d hanh trinh khiu nghjch, tinh theo (3) lien hgp va xich mang cao tinh theo Tdc xich mang cao thudng khdng qua v = v,±v,^ =v„.(kv± 1) , (3) 1,1 m/s de giam tai trgng va dap qua trinh dd: v^ - tdc xich mang cao, m/s an khdp vdi d7a xich [1] Vm - tdc di chuyen may lien hgp, m/s Dien tich tiet dien ngang eua ddng vat lieu k\ = Vx/ Vm he sd tdc chuyen ddng tuong doi mang ddng vat lieu tren mang cao Fvi = Bm h,T, kcd.Cp, m^ , (6) Dau (+) (3) tuong u'ng vd'i hanh trinh vdi: Bn, va h^ Chilu rdng va chilu cao mang thuan CLia may lien hgp (hudng chuyin ddng ciia may ngugc vdi xich mang cao), cdn dau (-) chira vat lieu, m; kcd- He sd chit diy mang, thudng khoang 0,5 - 0,8: C|j- He sd kl tuong ung vdi hanh trinh nghjch cua may Neu nang suat cua may lien hgp dieu din anh hudng cua ddc dat mang din nang kien san xuat da cho la Q^ (t/ph), thi nang suat suit van tai, len ddc 30" lay 0,5 va xudng ddc 20° liy 1,5 [1] I 50 Tir dd, chieu cao cau mang can thiet la Hm = hm- vdi hm = '3600.k,,.k,,.Cp.Y.v va chieu rdng mang can thiet Bm = k,T, h,T,, m (7) m • _ (8) vdi: km = - [1] - he so ty le chieu rdng vd'i chieu cao mang Chieu dai phan mang bj udn cong di chuyen tien guong (Hinh 4) tinh theo [1] L„ = J4b.fR + | V b ' ,m I Mang cao uon; Vi chong; May lien hcfp Hinh So' dd tinh toan chieu dai phan udn cong ciia mang cao lam viec td hgp dd: b- bude di chuyen ciia mang cao vao guong Id ehg (chieu rdng dai khau cua may lien hgp), m; R - ban kinh cung udn cong tao bdi cac doan cau mang quay tuong ddi vdi nhau; I - chieu dai doan cau mang quy chuan, m; B - chieu rdng doan cau mang d khoa ndi (khoang 1,2 Bm), m; Al - khe hd tai khoa ndi, khoang - mm [1] IR Ban kinh cung udn cong R = ^ (10) Khi cho trudc chieu dai phan udn cong ciia mang cao (Lu = - 15 in [4]) cd the xac djnh dugc chieu dai thich hgp ciia mdt doan cau mang 3.3 Cdng sudt dpng co trgm ddn dpng mdng edo Trong trudng hgp thiet ke mang cao hoac kiem tra kha nang lam viec ciia mang cao cu the cin tinh chinh xac cdng suat ddng co tram dan ddng mang cao Cdng suat ddng co tuong irng vdi ben cho phep ciia xich keo dugc \ac dinh theo cdng thirc (S,-S, + W, + W,).v _ Ndc-kd ^^^ ,k\\.(ll) dd: S, - su'c cang xich tai diem tdi tram dan ddng, tinh theo S, = Z,.[S],N , (12) vdi : Zx - sd xich keo ciia mang cao; [S] - siic cang cho phep theo ben cua mdt xich mang cao, [S] = Sd /nb; vdi Sd - tai trgng pha buy xich theo tieu chuan cua nha che tao, khoang 70 - 320 kN (bang 4.4 [1]); n^ - he sd du trir ben cua xich, ke tdi tai trgng ddng lay - [ ]; Sr = Zx.(2500 - 3000), N - su'c cang xich tai diem rdi dTa dan ddng, theo dieu kien an khdp cua xich vdi dTa xich; Wc - sue can vimg mang cao udn cong di chuyen tien guong; Wd - sue can xich udn qua dTa xich dan ddng, tinh gan dung Wd = 0,05 (St + Sr); V - tdc xich mang cao, m/s; r| - hieu suat bd truyen ddng, khoang 0,8 - 0,85; kdi - he sd du tru' cdng suat dan ddng, khoang 1,1-1,2 [1] Sue can vimg mang cao udn cong di chuyen tinh theo [1] Wc= Sva.(e''" -1) , (13) vdi: Sva - sue cang cua xich tai diem vao doan cong, gia trj Idn nhat bang St theo (12); f- he sd ma sat giu'a xich gat vdi mang; a - gdc quay cua doan mang udn cong (hinh 4), (14) tinh theo 111 a = arc sin—- ; 2R 3.4 Chieu ddi ldm viec cua mdng edo Chieu dai lam viec cua mang cao [1] 1000N,,.ri m 1,1 [2q^.f^.cosP + q.(f.cosP ± sin PJ.g.v (15) do: Ndc - cdng suat ddng co', kW; r] - hieu suat bd truyen ddng; g - gia tdc trgng trudng, 9,8 m/s ; V - tdc xich keo mang cao m/s; qo - khdi lugng bg xich lap gat phan bd theo chieu dai, kg/m, trudng hgp thieu sd lieu chinh xac cd the tinh gin dung qo = 2500 Bm cho mang cao cd hai xi'ch keo [1]; fo - he sd ma sat giua xich lap cac gat vdi mang, liy 0,25 - 0,4; q- khdi lugng vat lieu phan bd tren rnang, kg/m, dugc xac djnh tir nang suit yeu cau q = Q/3,6 v; f - he sd ma sat giua vat lieu va mang, liy 0,4 - 0,6; P - Gdc doc dat mang 51 Lay dau (-) (15) mang cao lam \ iec len ddc va dau (-) mang cao lam \ iec xudng ddc Ket luan Can cir theo tinh nang cua may lien hgp chung loai thiet bj dieu khien ap luc md va so lam viec cua td hgp thiet bj khai thac xac djnh cac thdng sd co' ban cua mang cao theo cac bude: - Xac dinh nang suat thuc te Idn nhat cua may lien hgp theo cdng thu'c (1); - Xac djnh nang suat yeu cau cua mang cao tuong ung vdi hanh trinh khau nghjch, ngugc chieu chuyen ddng ciia xich mang cao theo cdng thuc (4); - Xac djnh thdng sd hinh hgc ciia cau mang gdm cd chieu cao mang theo cdng thuc (7), chieu rdng mang theo cdng thirc (8), chieu dai doan cau mang theo cdng thiic (9); - Xac djnh cdng suat dgng co' tram dan ddng mang cao theo cdng thu'c (11); - Xac djnh chieu dai lam viec ciia mang cao theo cdng thu'c (15) Kit qua xac dinh cac thdng so co '^cua mang cao gdp phin tao thuan Igi Uiiet ke chi tao hoac lam co sd cho \ iec bra chgn su dung mang cao dua tren nguyen tac ddng bo hoa^cac xh\k bj phin td hgp thiet bj khai thac than Id dig md him Id T.\l LIEU THAM KHAO [1] Nguyen Van Khang 2005 May va td hgp thilt bj van tai mo Nha xuit ban Khoa hgc ky thuat Ha Ndi [2] V.N Grigoriev V.A Diakov, lu.X Pukhov 1976 May van tai va td hgp thilt bi khai thac md him Id "Nbedra"", Moskva, (tieng Nga) [3] A.X Burtsakov, B.M Vorobiev, A.P Bobilev, 1978 Cdng nghe co' hda va tir ddng boa cac qua trinh san xuat khai thac mo ham Id "Nbedra"", Moskva (tieng Nga) [4] V.I Xolod, V.N Ghetopanov, V.N Patsek 1982 Thiet ke che tao may va td hgp thiet bj khai thac md "Nhedra", Moskva (Tieng Nga) [5] A.O Spivacovski, 1983 May van tai "Nhedra", Moskva, (tieng Nga) SUMMARY Determining basic parameters of scraper conveyor in the coal mining equipment complex for wall face of underground mine Dang Tran Viet, University of Mining and Geology Ta Thi Thuy Linh, V-Trae Joint-Stock Company Based on principle of synchronizing the coal mining equipment complex for wall face of underground mine, this paper presents method of determining basic parameters of scraper conveyor such as request productivity, dimentions of conveying trough section, drive power, length of scraper conveyor Resuls of calculation make advantage for design, manufacture or selection of utilising scraper conveyor in accordance with mining conditions in Vietnam Ngudi phan bien: Nguyen Vdn Khdng 52 ... thiet bj khai thac than Id ehg diing may bao - mang cao udn ket hgp vi chdng thu} luc tu hanh cho phep co'' hoa toan bd qua trinh khai thac than (hinh 3) Hinh So dd td hgp thilt bj khai thac than. .. Hinh Td hgp thilt bj khai thac than Id ehg diing may bao - mang cao udn ket hgp vi chdng thiiy lire tu hanh Cac thdng sd co'' ban ciia mang cao td hgp thiet bj khai thac than Id ehg Cac thdng... budng khau dau Id ehg thi td hgp thiet bj thuc hien co'' gidi hoa toan bd qua trinh khai thac than Day la cdng nghe khai thac md tien tien cd nang suat cao va an toan Mang cao udn di chuyen tien guong