Cải tạo hệ thống truyền động điện cho các máy xúc EKG 4,6(5) một giải pháp mang lại hiệu quả

Thong tin khoa hoc cong nghe mo

GAI TAO HE THONG TRUYEN DONG DIEN CHO CAC MAY XUC EKG-4,6(5)

mot giai pliap mang lai liieu qua

Up to now, there have been 58 EKG -4,6 (5) excavators

from Russia (former USSR) being used at Vietnam open

pit mineral mines. So far, it is considered as a kind of

excavator having high productivity and efficiency in the

mining industry. The paper refers to the solution for

improving its electric transmission system proposed by

Russian experts

ThS-VUTH^NAM

KS. DAO ANH TUAN

KS. TRAN TRQNG HOAN

Vien Khoa hgc Cdng nghe Md- Vinacomin

1 - Dat vin d§

May xuc EKG-4,6 (5) eua

Lien X6 (cu) hien tai duae sii'

dung rat pho bien trong khai

thae mo cua Viet Nam, rieng

trong Tap doan Cong nghiep

Than Khoang san Viet Nam -

Vinacomin da eo 58 may xuc

EKG-4,6 (5) dang van hanh tai

eae mo 16 thien.

May xuc EKG-4,6 (5) phan

lo-n la mlu thiet ke tir nhiing

nam 40 cua the ky truo'c va

he thong truyen dpng cua

chung hogt dpng theo nguyen

ly May phat - Dong ca (G-D).

U'u diem thiet ke cua hp thong

G-D la CO do tin cay tuang doi

cao vo'i dieu kien phai thuang

xuyen theo doi va thay the kip

thai cac bp phan hao m6n

(v6ng bi, choi than...). Tuy

nhien, vipe thay the cac linh

kipn nay mpt mat lam tang chi

phi van hanh, mat khac neu

nhu khong thay the kjp thdi se

din den cac hdng hoe khac

Idn han ma vipe khac phuc

chiing ddi hoi eae ehi phf Idn

va ca ve thdi gian. Ngoai ra,

hp thong cac dpng ca va may

phat cdn lam tang dp rung va

tieng on trong qua trinh v$n

hanh may. Kinh nghipm cua

eae nude tien tien tren the

gidi da cho thay tinh uu vipt

eua vipe ap dyng cho may md

cac hp thong truyen dpng dien

tien tien hon vdi eae bp bien

doi khong c6 cac phan tu'

chuyen dpng. Su' dung eae bp

bien doi bang ban din cho

phep tang he so cong suat

coscp cung nhy eae ehi tieu

kinh te ky thuat eua hp thong.

Dirng vj tri dau tien d eae

nude SNG ve san xuat cac he

thong dieu khien ha ap trpn bp

(NKU) cho eae loai may xiic

tai thdi diem hipn tai la Cong

ty Co phan "Rudoavtomatika".

Phan Idn cac NKU dyoc thiet

ke cho he thong G-D, nhung

dong thdi Cong ty cung tfch

eye tien hanh eae nghien ciru

khoa hpc nham tim ra eae hp

thong tien tien han thay the

cho he thong G-D cu.

2 - Giai phap d§ xuSt

Ca sa phan tfch hieu qua

SLf dung nang lyp-ng cua cac

he thong dieu khien truyen

dpng dipn khac nhau (hinh 1)

cho phep chung ta khang djnh

sy can thiet phai thay the hp

thong gia c6i G-D bang he

th6ng Bp bien doi dien dung

Thyristor - Dpng ca (TP-D).

Mpt trong nhOng ly do quyet

djnh cho sy thay the nay la

cac dpng ca dien mpt chieu

thiet ke chuyen cho may xuc

da ngay cang pho bien rpng

rai cung nhy sy dap irng eua

eae ca sd su'a chua, bao

duang chung. Ngoai ra, khi

su- dung bp Ipc bu (FKU) de

bii cong suat phan khang, he

thong nay ed he so hieu qua

sii' dung nang luong cao nhit

(hinh 1).

Chung ta cung biet rang

gia trj dieu chinh cac ca cau

chinh cua may xuc dao dpng

trong khoang 0=2-5-3. Tren do

thi ta thay ro rang he thong

duy nhat vuot trpi he thong co

dien Dpng ca dong bp-May

phat-Dpng ca mpt chieu (SD￾G-D) ve ehl sd hieu qua sir

dung nang luang la he thong

TP-D c6^ Ipc-bu FKU. Xet ve

chi phi tong the thi ca hai he

thong SD-G-D va TP-D cd chi

phi gan nhu nhau va dd la

dieu kien de dinh hudng

nghien ciru ap dung he thong

TP-D cd FKU.

He thong Dpng ca khdng

dong bp-May phat-Dpng ca

mpt chieu (AD-G-D) duae sii'

dung tren may xiic EKG-4,6

(5). Sa do nguyen ly he thong

cung cap dien hipn tai cua

may xuc EKG-4,6 (5) nhu tren

hinh 2.

Nha may san xuat may

mdc hang n|ng thanh pho

Ural da xuat xudng han 13

nghin chiec va chi rieng cac

md vung Kuzbass da ed tdi

249 chiec EKG-4,6 (5) dang

KHCNM SO 4/2011* CO DIEN - Tl/DONG HOA MO