Cải tiến máy duỗi thép bán thủ công thành máy cắt duỗi thép tự động

KHOA HOC-UNO DUNG CAI TIEN MAY DUOI THEP BAN THU C N G THANH MAY CAT DUOI THEP TlT DONG • TS Lfe DINH KY (Chu nhiem) (*) TOM TAT Thue ti edng tde thi cdng xdy du:ng trin thi trudng Viet Nam hiin vdn cdn chu yiu la thu edng vd sir dung edc logi mdy dan gidn ndng sudt thdp dd ddn den ehi phi sdn xudt cao khdng tdng duac ndng sudt lao dpng Xudt phdt tir nhu cdu thuc te do, nhdm nghien cicu nhgn thdy cdn cdi tiin cdc thiit bi cd sdn tir sdn xuat thu edng sang sdn xudt tu dpng di ndng cao ndng sudt De tdi nhdm chpn la cdi tien mdy cat dudi thip thd cdng thdnh mdy cdt dudi thep tu ddng, nhdm tdi uu hda viec thi cdng cat dudi thep ndng cao ndng sudt vd tiet kiim lao ddng Mdy cdt dudi thep tren thi trudng hien chi cd tinh ndng dudi thep cdn cdc hogt ddng khde nhu dp ddi, cdt thep diu dua vdo lue luang lao dpng thu cdng Id ngudi, edc thao tde di thg-c hien cdc cdng viic ndy edn it nhdt la 02 ngudi ldm liin tgc vd thdi gian dirng mdy rdt nhiiu de thuc hiin edc thao tdc; do ddn din ndng sudt thdp Nhdm nghien euu da kit hap mdy cdt dudi vd cdc bp phan phg trp nhu bd dim, edm biin, dao cat di tu dpng hda cdc thao tdc thu edng Tie khda: xdy dung, eat dudi thep, ndng sudt, lao ddng, tu dpng hda, SUMMARY Actual construction work in the Vietnamese market today is still mostly handmade with simple machines with low productivity, thus resulting in high production costs without increasing the labor productivity From that fact, the research team has found that it is necessary to improve available devices from handicraft production into automatic one to improve productivity The theme selected is to improve handicraft steel stretching cutting machine into automatic one to optimize cutting and stretching the iron, improving productivity and saving labor The iron stretching cutting machine in the market today only has the feature to stretch iron and other activities such as measuring length, cutting iron are based on manual human labor force, to perform these tasks should need at least 02 people working continuously and •• lot of time for manipulation; thus leading to low productivity The research team has combined the stretching cutter and accessories such as counters, sensors, cutting knives to automatic manual manipulation Key words' building, steel stretching Dat van tlh Ngdy nay, nganh xay dung dugc coi Id mgt ngdnh phat trien vdi tdc nhanh Hdng ngay, cd rdt nhidu cdng trinh duge cutting, productivity, labor, automatic, dyng Ien dd phuc vy cho nhu cdu eua ngudi Dd xdy dugc mpt can nhd, mpt eong trinh, chung ta can rdt nhidu thu, nhung cd le quan trpng nhdt Id thep Nd Nh6m tac gia T r u i n g DH KTCN LA; TS Lfi Dinh Ky (chu n h i f m); KS Tran Thanh Tuan ; KS N g u y i n Minh A n ; KS Uft ThSi Thu^n; KS Vo Qu«c Trung KHOA HOC-UNG DUNG Id vat lieu khong thd thidu cua ngdnh xay dung, nhd co nd md ta cd thd xdy dugc mpt ngoi nha, mgt eay edu cho tdi nhidu cong trinh tdm cd khac Sau mgt thdi gian ddi tim hidu vd di khdo sdt thyc td, nhdm chiing toi da quydt dinh ehgn chd tgo may cdt dudi thep ty dgng Hau nhu d cdc cong trinh xdy dung thudng thi ngudi ta keo thdng thep bdng cdc may cdt tho so, sau dd cdt thep bdng De khae phuc nhugc didm cua mdy dudi thep truydn thdng hien tgi, nhdm nghien cuu ehung tdi dd dua nhung cdi tidn cho may cat dudi truydn thdng nhdm mang Igi ndng suat vd hieu qud cao nhdt cho nhd thdu thi cong xay dyng Cdc tidu chl cho may duoi thep s a u cdi tidn Id: • Ty dgng hda duoi vd cdt thep, tidt kiem thdi gian • Ddy nhanh tidn d khdu thep Nhiing bd phdn mdy phii hap vcri diiu kien thuc ti tay Mpt sd nai cdt thep bang mdy chi cat duge mpt sgi T u nhiing Idn di tim hidu thyc td nhdm chung toi da quyet dinh cdi tidn mo hinh mdy duoi thang vd cat thep xdy dung Day Id may cd cong dyng rdt khd thi, khdng nhiing gid thdnh hgp ly ma mdy cdn ed the cdt dugc mgt lue hai thdp Tong quan nghidn cuu 2.1 Thuc trgng cua mdy dudi thep hien nay: + Do vd cdt thu cdng sau duoi (thudng su dung thep eugn ^ - Thep da du6i thing Cam bien tiem can Hinh I: Bo phdn Bo ph^n cat: Bo giam toe De dao cat True lech tam Dao cat bang tao iLfc eat thep CLPng ^ Bong ec dien L5dln hifong thep" Hinh 2: Bo phdn cixt KHOA HOC - U NC DUNG Nay vdi thiet kd trdn mdy dgt ndng suat lOm/phut ehi can cdi dat ldn dau khong can cong giam sat, van hdnh Mdy cat dudi thep cua nhdm nghidn cuu duge ung dung cdc cong trinh cong ty CP XD-GT-DV-TM Midn Nam thi cong cy thd nhu: Cong trinh Khu Du Lich Dai Nam - Binh Duong Cong trinh Phdp Vien Minh Dang Quang Cong trinh Trudng Dgi hpc Kinh td Cong nghiep Long An Vd mgt so eong trinh khdc cua cong ty Kdt luan Qua thyc td dp dung tai cdc cdng trinh (tu ndm 2007 ddn nay) may cat dudi thep tu dgng ed ede uu diem sau : + Lam tang nang suat cua vipc duoi cat thep len han gap 30 - 50 lan so vai chua dp dung mdy + Vide dp dyng mdy se gidm bdt cdng lao dgng thu cong khong can phdi tuc true thudng xuyen ma cd the chuydn sang eae edng tac khdc lam gidm bdt edng lao dgng d6 se giam gid thdnh thi edng mdt each ddng kd + Rut ngdn thdi gian thi cong edng tdc cdt dudi thep, dd se Idm tien dp thi cdng se dugc day nhanh so vdi ydu cau + Kinh phi ddu tu ban ddu cho ede cdng tde cdi tidn may khodng 20 trieu, gid thdnh ndy t u a n g doi phu hgp vdi cdc nhd thau vua vd nhd eua Viet Nam hidn +Khdo sdt thuc te neu ddu tu cdi tidn chi sau dp dung cho mgt cdng trinh thi cong thi nha thdu se hodn vdn va ndu cong trinh quy mo Ion thi Igi ich se tang len dang ke Qua nghien cuu vd dp dung vdo thyc tidn thi cong xdy dyng, mdy cdt duoi thep ty dpng da gdp phdn dang ke eong viec cai tgo va ndng cao nang sudt lao dpng edng tde thi cong xay dyng Chung td sy hihi ich that sy edng vide dp dyng cdng nghiep hda ngdnh xdy dung Nhdm nghien cuu kien nghi dua mdy cat thep ty dgng bidn rpng rai trdn thi trudng Tdi lieu tham khdo [1] Dang Van Thanh (chu bien) (2010), Gido trinh ky thudt diin, NXB Dai hgc Quoc gia Tp HCM [2] Ld Ngpc Bich (2011), U'ng dung diin cdng nghiip, NXB Thdi Dgi [3] Le Thi Thanh Hodng (2008), Gido trinh Ky thudt dien, NXB Dgi hge Qudc gia Tp HCM [4] Nguydn Dinh Tudn, Vu Xudn Hodng (2009), So tay kiem todn- dpng ca djpn, NXB Khoa hgc vd Ky thudt Ngay n h a n : 16/3/2014 Ngay duyet d a n g : 29/4/2014 TAP CHI KINH TE - CONG NGHIEP m