NGHIEN CUfU-TRAO DOI / M O T S GIAI PHAP NANG CAO 0 TIN CAY CO KHJ HE T H N G DO Sgi MAY SQI CON SOME SOLUTIONS TO IMPROVE MECHANICAL RELL\BILITY FOR DOFFING SYSTEM, SPINNING MACHINE ThS Pham Van Hiing, PGS, TS Hoang Van Gpt Vien Nghien cuu Co khi, Bd Cdng Thuong TOM TAT Trong todn nganh Soi tgi Viet Nam cd khodng 4000 mdy spi dang hoat dpng phuc vu san xudt, khdu sp-i cua cdc mdy dupe tu dpng hda, thay the thu cdng, chi cdn mpt ngudi thp da phuc vu duac mdy, th&i gian dimg mdy de thdo dat bup sai vd loi vdo vi tri gidm di 50%, ndng sudt khdu sai cao ham tren lan De bdo ddm he thong hogt ddng dn dinh dat nang sudt thi dp tin cay cua CO cdu dong vai trd rdt quan trpng De tdi se de xudt mot sd gidi phdp de ndng cao tin cdy co cho he thong spi mdy spi Tir khoa: He thong spi, mdy spi ABSTRACT In textile industry in Vietnam, there are about 4000 spinning machines operating to support for production In this process, spinning period is automatic to replace manual operation Only operator can operate machines, so stopping time to remove, putting bobbin and fiber core into place is reduced 50% and doffing capacity increases times In order to ensure reliable operation of system, stability of whole structure plays very important role This parper will propose some solutions to improve mechanical reliability for doffing system of spinning machine Keywords: Doffing system, spinning machine TAP CHI CO KHI VIET NAM, Sd nam 2014 www.cokhivietn am NGHIEN CUfU-TRAO D | NGUYEN LY HOAT DONG CUA CO CAU 2.2 Chirc nSng ciia mdt sd bg ph3n chinh DO SOI [5] - Ddng co-gmm tdc (9) la ddng co chmh cho giam tdc truygn ddng cho bd truyen vit medai dc (8) va cho true dan (6) chuyen ddng tinh tien - Ca can nang - (4) cd chirc nang nang, gia kep(6); Bang truyen (3) ed chiic nang van chuyen blip sgi va loi sgi Hinh 1: So nguyen ly cua co cdu chap hdnh3.heTHlTC NGHIEM CHU TRINH CUA QUA thdng soi TRINH DO Sgfl I) Tryc ddn: 2) Cum bgc titccft: 3) Thanh truyen: 4) Thanh nang; 5) O co dinh; 6) Cifm chot xoay, 7) Gia Icep bup sai Nguyen ly hoat ddng: So nguyen ly md ta tren hinh Nhd true dan ddng (1) cd chuyen ddng tjnh tien theo chieu dpc true, theo gdi dd (5) dugc cd dinh vdi true (1) ciing ehuyen ddng keo theo nang (4) (cd the xoay hai chieu quanh ehdt tai d) Gia kep (7) nang len hay xudng, vao chieu chuyen dpng tinh tien eua true (1) Chuyen ddng nang len ciia gia (7) lap loi sgi vao may sgi hoac xudng thao bup sgi khdi may sgi Qua trinh thao va lap loi va thao va lap blip spi dupe thyc hien ty ddng Ket qua thyc nghiem chu trinh dd sgi tren he thdng sgi ty ddng eiia Dai Loan dugc tinh tir thdi diem lap loi sgi vao gia sudt (1) va ket thuc vao thdi diem loi spi dupe lap vao bang truyen (3) tdi vi tri san sang cho chu frinh dd sgi tiep theo Chu frinh dugc md ta fren dd thi (hinh 3) CAU TAO VA CHlTC NANG CUA HE THONG DO S(?I Hinh 3; Dd thi chu trinh soi 2.1 So* dh nguyen ly cdu tao [5] r "^ ', it fT , t i "^ " " Hinh 2: So nguyen ly cdu tgo ciia he thdng dd spi I) Gid sudt sai mdy sfri 2) Gid da mdy sai con, 3) Bdng tniyen blip sai 4) Ca cdu ndng-ha; 5) Gid kep blip sai; 6) True ddn dong 7) Gid da ca cau dd sai; 8) Sp tniyen vit me-dai 6c; 9) Dong ca-gidm tdc DQ TIN CAY CUA HE THONG DO SOI 4.1 Khai niem chung ve tin cay cua mdy m6c,thietb|[ll,[21,[3] Dp tin cay la kha nang boat dpng cua thiet bi thyc hien chirc nang cua nd frong mpt khoang thdi gian su dung nhat dinh dudi didu kien boat ddng xae dinh trudc Do tin cay duge phan loai nhu sau; a Do tin cay thiet ke: Dp tin cay thidt kd la de dam bao mure yeu cau eua tin cay san pham qua qua trinh thiet ke san pham bao gdm: Phan TAP CHI CO KHi VIET NAM, Sd nam 2014 www.cokhivietnam.vn NGHIEN ClJfU - TRAO D I tieh chuc nang, lap ban ve che tao, qui trinh cdng tin cay cua he thdng Viec kiem soat chat lupng nghe ehe tao va cdng nghp vat lieu ehi tiet che tao giup ta danh gia dugc dp tm cay va cd the dam bao duge dp tin cay thdi gian sir b Kiem soat chat lugng: Qua trinh che tao dung san pham Cac chi tidt dugc chd tao d mot mot san pham bao gdm qua trinh che tao cae ehi nguyen edng bat ky se ludn bien dpng nhieu tiet, lap rap cum va cuoi cimg la lap rap yeu td, chang han la mdn ciia may cdng cu, sy san phdm hoan chinh khac cita vat lieu, ngudi van hanh Ket qua td hgp cac bien thien dd cd the dupe md hinh boa c Kha nang san sang: Kha nang san sang gan vdi phan bd chuan (hinh 4) [2], phan bo lam vide cung la mot phep do tin cay Kha dupe dac tnmg bang gia tri trung binh va lech nang san sang cdn bao gdm nhimg van de ve du chuan eiia nd nhu 68,3% Cac chi tik ndm trii +ltTciia gia tri trung binh, 95,4% nam frong+2ff va 99,7% nam frong+3a.3