NGHIEN CUfU-TRAO DOI V PHiraNG PHAP TINH TOAN N\dl SO THONG SO CUA RANG CAT TREN MAY KHAU THAN DUNG TRONG KHAI THAC HAM LO VUNG QUANG NINH METHOD FOR CALCULATION ON SOME PARAMETERS OF CUTTING TEETH OF WINNING MACHEME EMPLOYED IN UNDERGROUND COAL MINING, AT QUANGNINH AREA ThS Le Quy C h i k ' , ThS Nguyin XuSn Thanh', PGS, TS Dinh Van Chien^ ThS Pham Van Tien^ ThS Nguyen Chi Bao^ 'Trudng Dai hge Cdng nghiep Quang Nmh ^Trudng Dai hgc Md - Dia ehdt Ha Ndi ^Trudng Dai hgc Cdng nghiep Ha Ndi TOM TAT Mdy khdu than dung de khai thdc than Id cho; Can cu vao tinh hinh dia chat md, cong ngh$ khai thdc md d vung Quang Ninh, bdi bdo trinh bay ket qud nghien ciru, tinh todn mot sd thdng sd cm rang cdt tren mdy khdu than dung de khai thdc than Id cha kit hop ciing vdi mang cao khai thao md vung Qudng Ninh Ket qud nghien ciru duoc diing de tinh todn, lua chpn rang cdt cua bo phgn cdt, cdc chi tiet, cum chi tiet mdy khdu vd nghiem ben mot so cum chi tiet cua may khdu than Tir khoa: Mdy khdu than, mang cdo khai thdc than, rang cdt, bo phan cdt ABSTRACT Coal winning machine is used in longwall coal mining Based on the geological situation of mmes and mining technology in the Quang Ninh region, this paper presents the results of research and calculation of parameters of cutting teeth of coal winning machine, which is combined with drag conveyor in mining in Quang Ninh region These results are used to calculate and select cutting components, parts and their group of coal winning machine In addition, these results from this research are used to check the strength of parts of a coal winning machine Keywords: Coal winning machine, drag conveyor, underground construction, cutting teeth, cutting parts parts TAP CHI CO KHi VIET NAM, Sd nam 2014 www cokhivietn a m.vn NGHIEN CUfU-TRAO061 khau: 1,25; 1,4; 1,6m; + Tdc quay tang khdu: 40, 46; 52 vdng/phiit; + Budc khdu: 0,63m; Van tdc di chuyen may: m/phut; 4- Luc keo: 325kN; + Ap lire lam viec Idn nhat cua he thdng thuy lire: l4MPa; + Trgng lugng toan bd may: 22.000 kG l.B^TVANDE Trong cdng nghe khai thac ham Id d vimg Quang Ninh hien nay, da dung may khau true tiep d mot sd md thudc Tap doan cdng nghiep than va khoang san Viet Nam - Vinacomin nhu Khe - Vdi than cd kien cd f ^ -^ thi su Cham, v a n g Danh, Nam Man, Duong Huy Tuy nhien, nhirng loai may khau deu nhap dung may khau hep MG150/375-W la hgp li [4] khau Tuy thude vao kien cd cua dat da va khoang san (than), nang suat va tudi thg cua rang 2.1.2 Cdu tgo cffbdn, nguyen ly lam viec cUu bo cat ciing khac Trong gidi han bai bao nay, phgn cat mdy khau nhdm tac gia neu mot phucmg phap tinh toan, lua ehgn rang cat cua bd phan cat fren may khau dimg a Cdu tgo co bdn bo phdn cat [4] khai thac than ham Id vimg Quang Ninh, nham tang nang suat, gia va gdp phan Bd phan eat fren may khau gdm tang khau chu ddng frong viec lap ke hoach san xuat, sira va rang cat la co cau lam viec eua may, ed nhiem chua va tang ben bd phan cat tren may khau vu: cat rdi than khdi guong than va chat than da khau vao mang cao nhd tam xoan d tren tang khau Tang khau la tang xoan de, theo hudng eua NOI DUNG N G H I E N CUtJ canh xoan chia lam hai loai: Tang xoan trai (hinh 2.1 Tinh toan lire t^c ddng Un rang cat cua 1); Tang xoan phai (hinh 2) sir dung rang cat dang ehdt may khau 2.1.1 Cdc thong so diea vao tinh todn Viec lua chgn thdng sd tinh toan cho rang cdt ciia may khdu dirge dua tren mot sd chi tieu ky thuat sau [3]: - Khiu dugc than tren tren guong khau cua Id chg; Qua khao sat nhdm tac gia thay tai khu vue khoang sang than md Khe Cham thuan Igi ap dung md hinh ca gidi hoa ddng bd so dd edng nghe khai thae edt dai theo phucmg vdi mot sd thdng so c a b a n : Chieu cao khau than 1,8 ^ 2,4m; Ode ddc Id chg < 30"; Chieu dai Id ehg 100 ^ I30m; Chidu dai theo phuang eae khu vuc khai thac Idn han 400m; Khau dugc than cd kien cd trung binh d md Khe Cham la f ^ - - Su dung loai may khau hep MG150/375- 1— W Tnmg Qudc san xuat cd: + Sd tang khau: 02; + [ lui^u cao khau:l,3 - 2,85m; -1- Gdc ddc via ' ^' "^- - ^^°'' ^ *^^"§ ^^^^ ^dng co chinh: l50kV' ' 75kV/ - 375kW; + Dudng kinh tang Hinh Tang khdu phdi TAP CHI CO KHi VIET NAM, Sd nam 2014 www.cokhivietnam.vn NGHIEN CUfU-TRAO D | Tang khau frai lap tren tay khdu trai, tang khau phai lap tren tay khau phai Tdc vong quay cua hai tang khau nhu nhung ngugc chieu nhau, tang khau frai quay ngugc chieu kim ddng hd, tang khau phai quay cimg chieu kim ddng hd Tang khau cd ket cau han De nang cao tinh chiu mdn ciia tang khau, d mat tai than ciia canh xoan cd ban dap mot Idp kim loai chiu mdn, nang cao tin cay lam viec eiia nd Mam dau cua tang khau dimg ket cau dia, de giam tdn hao ma sat eua mam dau vdi guong than kbi tang khau cat than, giamfrdluc dan ddng ciia may khau Hinh 4: Cdc qud trinh phd vd than dd cua rdng cdt a Miii dao eat tae dung len be mat than da b Benfrongdiem tiep xiic be mat than da vdi dau mui dao (rang cat) xuat hien luc eat Hien nay, rang cat cua may khau tai Cdng ty than Khe Cham - Vinacomin dang sir dung c Vat lieu gidn bien dang cue bd rat nhd, dang ehdt (hinh 3)[2] benfrongvat lieu trudc dau miii dao luc cat tang, xung quang mui dao xuat hien lue keo, luc cat va luc keo dat den eudng nhat dinh se xuat hien vet nirt rm Hinh Cdc hinh dgng rdng cdt dgng ehdt b Nguyen ly lam viec [4] Mdmen dugc truyen tir ddng co qua hop giam tde dugc truyen cho tang khdu, lam tang khau quay Rang cat dugc lapfrenbS mat gudng xoan tae ddng vao dat da, pha huy, cdt ddt da tao bien dang cong tron Dudi su di chuydn cua may khau bd phan cat dugc tidn sat vao guong khau tiep tuc qua trinh cdt Qua trinh cdt than lap di lap lai va tao ludng khdu Than sau dugc cat khdi khdi nguyen thi dugc gudng xoan cudn vao va dua xudng mang cao d dudi gam may nen than duge dua lien tuc tranh hien tugng iin tac dudi tang khdu d Vet nut nhd phat trien, md rdng, xuat hien vien, cue nut vd va rai Ddng thdi cac hat bui bay hinh bui than, mot bd phan bui than hinh nguyen sinh cd sin via, hai loai bui ddng thdi phat tan Bui mat cdn dgng laifrendau mui dao binh phoi manh c Tinh todn luc tdc dong len rdng cdt dgng ehdt Khi tinh toan may khdu than, co nhieu phuang phap tinh khac nhau, dd xac dinh eae thdng sd cua may khau thudng xac dinh cac thdng sd CO ban mot each tucmg ddi Ta xet trudng hgp rang cdt dang chot (hinh 3); Sa dd tinh toan (hinh 5,6 va 7) * Xac dinh luc cat Sa dd lam viee cua bd phan khdu (hinh 5): * Qua trinh rang cat tae dung pha vd than da [5]: (hinh 4) Trong qua trinh lam viee, gudng xodn quay quanh true va tien v6 phia ddu Id chg theo TAP CHI CO KHI VIET NAM, Sd nam 2014 www.cokhivietnam.vn NGHIEN CUfU-TRAO OOl hudng len ddc Cac rang cdt fren b6 mat guong xoan se cdt phoi nhi6u manh hinh ludi ligm, mat phang eua cac ranh song song guong Id chg (mat a) ddng thdi d mat ddu mdi gudng xoan ciing phai cd cac rang edt dd tao nen mat guang Id, mdi rang cat vdi chigu day phoi cat khdng ddi ^ Hinh 6: So tinh h Theo [5] chieu sau cat trung binh: S K ^max" Chieu sau eat Idn nhat, cm (hinh 6) k: He sd phu thudc kieu cat, eat ban bao boc k = 1,2 Hinh 5: Sa Idm viec cua bd phdn khdu Gudng xodn tren; Guong xodn dudi; Mdng cdo Id cho; Than mdy khdu Cat tren be mat hd k = Dieu kien lam viec cua cae rang cat fren mdi gudng xoan la nhu nhau, cat tren be mat hd vdi chieu sau cat khdng qua Idn Rieng rang cat d vi tri A fren be mat gudng xoan la cat ban bao hoc, cd ben cua rang tham gia vao qua trinh Thay vao (1) ta dugc: cat - Tinh chieu sau cat theo budc cat t: Luc cat fren eac rang d be mat gudng xoan, theo [5] Khi cat bao bgc va cat tren be mat hd thi P = a.li,-N (1) h ' h Vdi chieu sau khau 630 mm, chgn t ^ 30 mm (dgc theo dudng sinh, dudng tam) Trong do: a: He sd can cat dan vi phu thudc vao kien cd cua than xac dinh bdng thuc nghiem, N/cm.Theo [3] tai md than Khe Cham dieu kien khai thae mpt xuong sau, tmh chat eua than cang phire tap, kien cd cua than chgn f = 4-^5, theo [5] ta cd a = 4500 N/cm h - chidu sau cdt trung binh, em Tj^co t - > c h o n - ^ ^ h -1/5 n 6: A,B, = D va B|C, = h Nhu vay ta cd: h^^^ = 30/5 ^ mm ^ 0,6 + Vdi rang d vi fri A (k = 1,2) thay vao (2) p.-a.(Ue]\^ 5=gEc.^ TAP CHI CO KHi VIET NAM, S6 nam 2014 www.cokhivietnam.vn (3) NGHIEN CUfU-TRAOD6| Thay a ^ 4500 N/em vao (3) ta dugc: Thay a = 4500 N/cm vao (8) ta dugc: /ã^=4500.|-.0,6 I ô1418W P,^=2,5.4500.f-.0,6| (- Vdi cac rang cat fren mat gudng xoan (k = 1) tac6: (4) 7t K - Voi rang cat tren b l mat guong xoan: P , = 2,5.Pg = , i ^ = — , N '' n 7t Thay a = 4500 N/cm vao (4) ta dugc * Xac dinh luc can cat tac dung len rang dang chot (hinh 7): Luc cat tren cac rang o mat dau Pj, cac rang a mat dau moi guong xoan cat vgi chieu day phoi cat khong doi, ta co: Pj = P^j = a.h = 0,6a, N - Vdi rang cat fren mat dau: P, = P + Xac dinh momen uon luc P2 tac dpng M^, theo [5] ta co: - 2,5 a 0,6= 1,5a, N (10) Thay a = 4500 N/cm vao (10) ta dugc: Vi tat ca cac rSng tren guong xoSn deu co tinh doi lan, deu chiu luc nhu nen kiim nghiem ben, chi can kilm nghiem vdi lire Icfn nhat tac dong len rang de dam bao dp bin Nhu vay, can nghiem bin rang cit vdi: (6) * Xac dinh luc can theo phuang tien ciia may P,; (hinh 7) Luc can an sau rang eat dugc xac dinh tu cdng thuc, theo [5] P =c.P,N y Trong d6: -2,5.P P i = P ^ j = 1,5.4500 = 6750, N F„j= 0,6.4500= 2700 W M = P 0,0705 (9) Thay a = 4500 N/cm vao (9) ta dugc: (5) Thay a ^ 4500 N/cm vao (5) ta dugc: ^2= =.10644 Af + Luc can theo phuong tien cua may len rang dang ch6t la P, = P^^^ = 6750N; + Luc can cat tac dung len rang dang ch6t la P^ = P^^ = 2700 N; + Mo men uSn P^ tac dong M = 190,35 Nm (7) P: Luc cat, N; c: He s6 ty le, h > 0,5 cm, chon c = 2,5 (theo [5]) - Nhu vay, vai rang cSt g vi tri A (hinh 6) P , = 2,5P, = 2,5.a £ , ,N (8) Hinh 7: Sa life tac dong len rang cdt dgng chSl TAP CHI CO KHi VIET NAM, So nam 2014 www.cokhivietnam.vn NGHIEN CljfU - TRAO D | X ^ ^ ^ t**^" kiem nghifm ben rang cat bang phan mem Inventor Dieu kien d6 rang cdt lam viee dam bao Trong gidi ban bai bao nay, nhdm tac gia bdn [I]: a