Tính toán thiết kế mâm quay 2 động cơ máy khoan cọc nhồi dùng trong xây dựng

NGHIEN CIJU-TRAO DOI TINH TOAN THIET KE MAM QUAY DONG Cd - MAY KHOAN COC NHOI DUNG TRONG XAY DLfNG THE DESIGN - CALCULATION FOR ENGINES - SWIVELING WHEELS OF FILER - DRILLING MACHINES USED IN THE CONSTRUCTION FIELDS TS Dao Duy Trung Vien Nghien ciiu Ca TOM TAT Bdi bdo gidi thieu torn tdt cdc ket qud tinh toan chon thdng sd thiet ke mam quay dong ca lap tren cdc mdy khoan coc nhdi nganh Xdy dung, thay the loai ddng ca Loai ndy co nhieu tinh ndng ky thuat ini viet, ddp img tdi nhu cdu thuc te ntrac Day la sdn phdm duac sti- dung vd nhap khau hien khd nhieu, cdn thiet nghien cuu tinh todn, thiet ke dong bo, cd tinh khoa hoc, coy nghia kinh te vd ky thuat tdt Tit khoa: Tinh todn; Thiet ke, Mam quay dong ca; Mdy khoan coc nhdi; Nganh xdy dung ABSTRACT This paper introduces briefly the caculation rerults to collec the parameters of design for engines -swinvening wheels fitted on the piler - drilling machines in the construction industry to replace Type I engine This type has many superior technical features, meet the actual needs of the Vietnam country This product is used and imported quite a lot today, the necessary for calculation research, uniform designs, scientific, economic sense and good engineering Keywords: Calculation; Design; engines - swinvening Construction fiedls TAP CHI CO KHi VIET NAM, So nam 2014 www co khivietnam wheels; Piler - drilling machines, NGHIEN cuu-TRAODOI DAT VAN DE vdng/phiit; Md men xoan tdi da: 200.000 (Nm); Phuang phap coc khoan nhdi su dung phd Khdi lugng may van chuyen: 50 tan [1] bien cho viec tao mdng xay chen giiia cac khu dan cu ma it lam anh hudng tdi cac cdng trinh va tranh dugc d nhiem mdi trudng xung quanh Vi vay, viec ap dung ky thuat tao cpc cho nen mdng cdng trinh bang phuang phap cgc khoan nhdi dam bao ve mat chat lugng, tinh kinh te, dieu kien mdi trudng la mot yeu td ma dang dugc nhieu cdng ty, ciing nhu cac don vi thi cdng dac biet quan tam viec sii dung cac thiet hi khoan cpc nhdi Trong qua trinh lam viec, mam quay cua may khoan cpc nhdi la ca cau tao mdmen ddng luc cho can khoan Tap trung nghien ciiu cac loai mam quay va anh hudng cua lire tac ddng tir cum dau khoan dat da den qua trinh gay mdn hong ciia mam quay dugc cac don vi quan tam Do khudn khd bai bao ngan ggn, chi tap trung tinh chgn md ta thiiy luc va tinh bd truyen ddng banh rang tru cdp, la hai cum chinh va quan ciia mam quay Hinh 1: Mdm quay R15G, su diing hai dong ca mdy khoan coc nhdi Hitachi KH230 1.1 Thdng s6 ky thu^t mot s6 mam quay truy8n dgng hai dong co" [1| a) Mam quay R15G mdy khoan coc nhdi gdn cdu Hitachi KH230 (xem hinh 1) + Chilu sau khoan tdi da ly thuylt: 96m; Chilu sau khoan tdi da: ~ 82m; Dudng kinh khoan tdi da: 2.500mm; truyin ddng: thiiy luc, dieu chinh cdng sudt tu ddng; momen xoan: 150.000 N.m; hanh frinh xi lanh ep: 580mm b) Mam quay RD 260 mdy khoan coc nhdi gdn cdu Soilmec SR-60 (xem hinh 2) - Dudng kinh khoan tdi da: 1,8 m; Do sau khoan tdi da: 66m; Ddng ca CAT: 261 kW tai 1800 Hinh 2: Mdm quay RD260 sii- dung hai ddng camdy khoan coc nhdi gdn cdu Soilmec TAP CHI CO KHI VIET NAM, So nam 2014 www.cokhivietnam.vn NGHIEN cuu-TRAODOI 1.2 Cau tao cua mam quay 02 ddng ca (xem hmh 3) (chpn sa bd i - 68,75); q - Hieu suat ciia he ddn J ddng (chpn so bd rj = 0.95) Vay, tdng mdmen ddu cua mdta thuy lire thoa man: IM„ My 7025 ' iXT] ^,75x0.95 Tu day, chpn M^g=3000 N.m =2679,5 N.m Mat khac vdi dau ca cau quay la 10 vg/ph vay sd vdng quay ciia mdta thuy luc la: i^g = i x 10 = 68,75 X 10 -687,5 (v/ph) Tdng cdng suat cua mdta thuy luc thoa man: 9,55.10' Trong dd: Hinh 3: Cdu tao mdm quay truyen dong dong ca [3] + M^: Momen dau ciia thiet bi mdta thuy luc, N.cm; k = 1,25: He sd du trii mdmen xoan; ^g = 687,5 vg/ph: Sd vdng quay ciia ddng ca thiiy lire phiit Thay sd, dugc: Trong do: 1) Ddng ca; 2) Hop sd hanh tinh; 3) Vd hop; 4) Banh rdng lien triic; 5) Vdnh rdng; 6) Phat lam kin; 7) True dng (ca cdu truyen Vi ta chgn mdta thuy lire vdi hop giam mdmen cdn khoan) 2.TiNH TOAN THONG SO THIET KE MAM QUAY X-,, 1,25x300000x687,5 , , , , „ , > ^rn^• -=26.7kW 9,55.10' ^ ^^ tdc dan ddng cho ca cau quay can khoan, nen mdmen va hieu suat cua mdi ddng ca se dugc chia ddi 2.1 Tinh toan M^^ - YM^Jl - 3000/2 = 1500 N.m 2.1.1 Chon mdta thuy lire [3] Theo cdng thiic: Cdng suat ciia mdi mdtg la: N^.j,=^ i;N^g/2 ^ 26,7/2-13,35 kW M, Vay, chpn mdta thuy luc nhan hieu PAVC-55 cd cac thdng sd sau: Trong do: M^^ 1X7] Mdmen dau cua thilt bi mdta thuy lire; i - Ty sd truyen cua he ddn ddng - Sd vdng quay cua mdto thuy luc: n^.^ - 750 v/phut (cd the diay ddi dugcrtr450 ^ 2600 v/phut); TAP CHI CO KHI VIET NAM, S6 nam 2014 www.cokhivietnam.vn NGHIEN cuu-TRAO DOI Mdmen hric quay M ^ ^ - 150 N.m; Cdng sudt 15 kinh cua can khoan ta chgn sa bd la d^,^ = 300 mm kW (cd thi thay ddi dugc hi - 22 kW) [4] thi dudng kinh ciia vanh rang la d^ = 660 mm 2.1.2 Thiet ke bd truyen banh rdng try cdp Theo nhu phan phan bd ty sd truyln d phdn trudc cd i = 2,75, vay: i = d^/d, 2.1.2.1 Sa ddn ddng (xem hinh 4) •^ d, = d,/i - 660/2,75 = 240 mm - Xac dinh khoang each true cua banh rang ankhdp: ^wi.2" (d,-f d,)/2 - (660 + 240)/2 - 450 mm - Xac dinh mddun m: Theo cdng thirc 6.17 trang 97 [5], cd m = (0.01 - 0.02).a^^= (0.01 - 0.03).450 = 4,5-13,5 mm Theo bang 6.8 trang 99 [5] ta chpn m = 12 mm Hinh 4: Sa ddn ddng hd truyen bdnh rdng tru - Xac dinh sd rang tren mdi banh rang: Dua vao mddun rang va dudng kinh vdng chia ciia I cdp banh rang ta tinh dugc sd rang tuang ling vdi mdi Trong do: 1,1'- Bdnh rdng lien true; banh rang nhu sau: - Vdnh rdng Ta chi tinh cho bd truyen 2-1, cdn bd truyln + Sd rang cua banh rang lien true 1: Zj = d / m = 240/12 = 20 rang; 2-1' tuang tu +Sd rang ciia vanh rang 2: Z^ - d^/m = 660/12 2.1.2.2 Tinh chgn vat lieu [4] = 55 rang - Bd truyen banh rang tru cap la thep 45 tdi cai thien dat cac chi tieu ca tinh sau: Banh rang 2.1.2.4 Kiem nghiem cap bdnh rdng a) Kiem nghiem rang ve ben tiep xuc: be: Dp ciing HB = 241^285, gidi han bin o^, Theo cdng thiic: 850 MPa, a^, - 580 MPa; - Banh rang Idn cd dp ciing HB - 192^240, ^ ^ ^ \2T.KJi a, =Z„.Z^.Zj + \)^r '^^^^ U[aJ gidi han b i n a^ = 750 MPa, o^= 450 MPa 2.1.2.3 Xdc dinh cdc kich thudc hinh hoc cua Trong do; - Z„ = 274 (MPa)"'; bd truyen [2] - Z^ : He so ke den hinh dang b6 mat tiSp xuc - Xac dinh dudng kinh vdng lan dugc xac dinh theo cong thiic: Vdi vanh rang 2, cd thi xac djnh dugc theo cdng thiic kinh nghiem ta chgn can khoan tir 2,2 - 2,5 idn dudng kinh cdn khoan, vdi dudng cos/ H \| sin 2a„, TAP C H l CO KHI' VIET NAM, So nam 2014 www.cokhivietnam.vn NGHIEN cuu-TRAODOI d day: (i^ - Goc nghieng cua rang tren hinh - b_: ChiSu rong vanh rang b^= ip " V tru CO so dugc xac dinh theo cong thiic: WA = cos a,.tgS Voi =0,32; Khoang each true a^ = 450 mm, vay b_,= 0,32x450 =144 mm voi a^ = a^^ = arctg(tga/cosP), Chpn b^= 145 mm + Vi ta chon la banh rang tru rang thang nen P^ ^ 0"; Goc profin cua cac rang tru rang th^ng a^ - Tj : Momen xoan tren true banh chii dong ciia dau la T = 175.280 (N.m) = a = 20°; Goc an khgp a = a = a = 20", ^' ' Thay vao 2cos/3j _ I 2cos0' ysin2a:,„, Vsm2.20 Ze: He so ke den sir trung khgp ciia rang ™ ,- , • , , , , , Ihay tat ca cac so lieu da tinh vao ta tmh duac; \ dugc xac dinh nhu sau: Zf,^ l4-£^ 144x3x250" ' »tT„