Nghiên cứu ứng dụng senxơ áp suất và lưu lượng để xác định nhanh tình trạng kỹ thuật của hệ thống thuỷ lực

NGHIEN CUtJ UNG DUNG SENXO AP SUAT VA LU^U LUONG DE XAC DINH NHANH TINH TRANG KY THUAT CUA HE THONG THUY LUC Ho Viet Hen Bg mdn Chi tgo mdy-Hgc viin KTQS Tom tdt: Bdo cdo di cap tai

NGHIEN CUtJ UNG DUNG SENXO AP SUAT VA LU^U LUONG

DE XAC DINH NHANH TINH TRANG KY THUAT

CUA HE THONG THUY LUC

Ho Viet Hen

Bg mdn Chi tgo mdy-Hgc viin KTQS Tom tdt:

Bdo cdo di cap tai cdc phuong dn xdc dinh tinh trgng ky thudt ciia he thdng nhdm phuc

vu cong tdc sira chua vd bdo dudng hi thdng thiiy luc; xdy dung w dd nguyen ly cdu tgo ciia thiit bi kiim tra nhanh hi thdng thuy lire; sa do mgch thiet ke; xdy dung phdn mini thu thdp

vd xu ly kit qud do; phirong dn ddu ndi thiit bi vai hi thdng thiiy hrcdi kiim tra ccic didng sd Pmax, AP, Q,„„x vd dong thai cd hai thong w P, Q cua hi thong; kit qud thir nghiem thiit bi Abstract:

This report mention the plans for determining the technical conditions, for the repair work and maintenance the hydraulic system; construction principle diagram composed of rapid testing equipment hydraulic system; implement the plan design cmd manufacture equipment; circidt diagram design, construction of software to collect and process measurement results; the project for connecting devices to the hydraulic system to check the parameters Pmax, ^ , Qmax ond simultaneously both parameters P, Q of the system; test results and equipment

I DAT VAN DE

De bdo dudng, siia chira he thdng thuy lyc tren cdc thiet bj nhu tdu thuyen, xe ca gidi ta

cd the dua chiing ve cdc tram sira chiia de kidm tra hodc su dung cdc stand di ddng de kiem tra

tai hien trudng nhung deu cdn phdi thdo rdi cdc linh kien thiiy lyc de kiem tra Cdc phuang dn tren deu gay lang phf khi md thidt bj chua den ban bdo dudng hodc bdng hdc chua ndng Ddi

vdi he thdng thiiy lyc dang con boat ddng nhung thdng sd ky thudt khdng ddm bao ta cd the kiem tra tai hidn trudng bdng thiet bj do (kidm tra nhanh) ddu ndi tryc tidp vdo he thdng de kidm

tra

Vdi phuang dn kilm tra nhanh ta cd the do dugc cdc thdng sd chfnh ciia he thuy lyc khi

dang cdn boat ddng dd la dp suat P, luu lugng Q Cdn ciir vdo cdc thdng sd ky thudt do dugc, ta

cd till chdn dodn dugc tinh trang thilt bj, xdc djnh dugc vj tri, tinh trang hdng hdc cua thiet bj

vd dya vdo cdc thdng tin nay dk dua ra dugc phuang dn sira chiia chfnh xdc, lam gidm nhe cdng

viec khdo sat cua ngudi sua chiia Bdo cdo ndy de cap den viec iing dung senxo dp sudt vd luu

lugng dk chi tao thilt bj kilm tra nhanh he thdng thiiy lyc

n NOI DUNG

1 Sff do nguyen ly

So dd nguyen ly cua thilt bj kilm tra nhanh he thdng thiiy lyc dugc trinh bay tren hinh 1 gdm cd 3 cym chfnh: cym thuy lyc; cum do, hien thj sd vd cum dilu khiln Cdc thdng tin cua

he thdng thuy lyc nhu luu lugng Q, dp lyc P dugc ldy ra qua cdc bd cdm biln, sau khi xii ly cdc tfn hieu do qua bd bii tfn liieu cdc thdng sd do se dugc hiln thj tren bd hien thj

Cum thdy luc bao gdm cdc van phan phdi, van tilt luu, van mdt chilu vd cdc ddu ndi

ghep Nd cd nhiem vy thay ddi dudng ddn ddng ddu vd dilu chinh gid trj cdc thdng sd dp sudt va luu lugng trong qud trinh kilm tra tuong irng vdi tfn hieu dilu khiln cua cum dilu khiln D I cho cum ggn nhe, tdt cd cdc van dugc ga len mdt dl van dugc ehl tao thay cho cdc dng ddn ddu tir cdc van din vdi nhau Cdc ddu ndi thuy lyc vdi ben ngodi (he thdng cdn kilm tra)"dugc ldp cdc cut noi nhanh 1dm cho vide ldp rdp trd nen nhanh chdng vd chfnh xdc

CK"

(; 111 dill:

l;2.') Klio]) iu")i nhanh 1 Van klirta 1 nga dp l|;c cao

5 Bp do luu lifi/ng dp sual \;i I'

6 Van an toin

7 Van ph.ln phdi

Hinh 1 So d^ nguyen ly thiet bj kiem tra ca d^ng hq thong thuy lyc

Cum do vd hien thi ^d bao gdm cdc senxo, cdc bg chuyen ddi A-D vd mdn hinh hiln thj

cdc thdng sd luu lugn§, dp suat vd nhidt dg Cdc senxo thu nhan cdc tfn higu can do, sau do chiing dugc chuyen ddi thdnh cdc tfn hieu di?n vd gid trj se dugc chuyen ddi vd hien thj tren mdn hinh hien thj tuong img

Cum diiu khiin bao gdm cdc thiet bj: PLC; cdc role, bien the Cym nay cd chiic nang

dieu khien cym thuy lyc va cum do Cdc phfm dieu khien dudi dang cac cdng tdc ddng md ddng didn dieu khidn cdc van dien tir va cdc senxo

2 Nguyen ly hoat dgng

Tdch ddng ddu tai vj tri cdn do bdng cdch ddu them dng mem d hai dau tach, ndi dng mem

<i 9 9 \ \ 9 ^

vdo ddu ndi 1 vd 9 qua cdc khdp ndi nhanh Nhu vay, ve nguyen ly ddng dau chay qua thiet bj

do vd se quay trd lai he thdng thuy lyc Sau khi thiet bj da dugc ket ndi vdi he thdng thuy luc

ta se khdi ddng he thdng thuy lyc Ban ddu khi chua tien hdnh do, ddng ddu vao cira P va qua cua T ciia van phan phdi 7 de trd ve he thdng thiiy lyc (bode vdo thiing)

a) Do dp sudt

Ddu tidn dat van an loan 6 d miic thap, khi cd tfn hieu cdn do dp suat Pma.x, he thdng van hoat dgng chi cho phep do P trong he cdn do Ddng dau se qua van 3, bg do 5 va van phan phdi 7, dudng P thdng qua cira B (V3 hoat dgng) nhung do cira B bjt nen dp suat he thdng cd va ddu se qua van 6 (V| boat ddng) theo dudn^ xd quay lai he thdng thuy lyc Dilu chinh ngudng an loan van 6 tdng vd dp sudt trong he tdng ddn len tir nhd din Idn ddn vd khi P dat tdi gid trj cyc dai ma

he thdng cdn do cd thi dat dugc thi dimg lai (hodc he thdng ty dimg)

Dem so sdnh dp sudt do dugc Pdo vdi dp sudt cdn dat cua he thdn§ Phi cdn do Nlu Pdo^^ Pht nhu vay he thdng cd dp sudt dat yeu cdu, nguge lai dp sudt cua he thdng khdng dat yeu cdu tai

vj tri kiem tra

b) Do luu lugng

Khi cd tfn hieu cdn do luu lugng Q, he thdng van hoat dgng chi cho phep do Qmax, ddu se qua van 3, bg do 5 vd van phan phdi 7 hoat dgng cho dudng P qua cua A (V2 boat dgng) qua van tilt luu 8 (md cyc dai) quay vl he thong thiiy lyc Nlu Q^o > Qh nhu vay he thdng du luu lugng tai yj tri kiem tra, nguge lai he thdng thilu luu lugng

c) Kiem tra tdng hgp cdc thdng sd dp suit va luu lugng

Trong qud trinh 1dm viec, he thdng thuy lyc cd thi lam viec khdng dat dugc cdng sudt nhu thiet ke ban ddu Vide kiem tra tdng hgp bd thdng sd dp sudt va luu lugng cho phep xdc djnh dugc cdng sudt he thdng tai vi trf kilm tra:

6 day: - P-ap sudt MPa;

Q-luu lugng Ift/phiit;

a - he sd phu thudc vao chuna loai bonr Theo so dd nguyen ly cua he thong do nhu tren hinhl khi cd tm iiip,, n-v ^ i i

ap suat ddng ihdi, ddng ddu ti he thdng cdn do sd qua c.c va!.^ bd T ^ ^ T^^";^^

thong duo'ng P qua cua A (V, boat ddng), qua van tidt luu 8 de v i h e thdn D^eu chini v.n net luu 8 se lam cho Q thay ddi ddn tdi P thay ddi

3 So' do mach dien

Thidt bj kidm tra nhanh vdi didu khidn ghep ndi PLC cho do chfnh xac cao, thdi gian thu thap du lieu ngan, tac dgng nhanh va cho phep iiiiydn dan dugc kdt qua cua phdp do ddn tmng tam dilu khidn

d xa So do mach didn ciia thidt bi dau ndi vdi PLC dugc thi hien trdn hinh 2

- • i r t * - ••-*{

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Man hr,h d n ung

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Hinh 2 Sff do mach dien ciia thiet bi ddu noi vdi PLC

e<^iy ''t^V.li^^tf * i * * !

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•4> r t ju lu(74 Luukt^^^Mt^^rv

Mr<E-V' f * * n <*> g*a here

Hinh 3 Giao dien phan mem may tinh va anh thiet bi

Mdt trong nhimg khd ndng quan trgng ciia Thiet bj kidm tra nhanh do la thue hien kit ndi

vai mdy tfnh theo chudn RS232 qua cdng COM ciia may tfnh Vdi phdn mim do tdc gid xay

dirng cho phep tir may tfnh cd thd thu nhan kit qud do, xir ly, thi hidn va luu trir cac kit qud

^0 Giao didn chfnh ciia phdn mdm dilu khien the hidn trdn hinh 3

4 Kiem nghiem va thii- nghiem thiet bj

Thidt bi kidm tra nhanh he thdng thiiy luc (hinh 4) da dugc che lao tai bd mdn Che tao may vdi khoang do P lir 13-320KG/cm2; luu lugng do Q tii' 15-H200lit/phut va da dugc kilm djnh lai tai Trung lam do ludng thugc Tdng cue lieu chudn do ludng chdt lugng

Bang 1 Xac dinh sai so tan mat ciia luu lugng Q

TT

1

2

3

4

5

6

7

8

9

P.MPa 1.30 1.60 2.00 2.30 2.60 3.00 3.30 3.60 4.00

K i t qud do Q; Ift/ph L^n 1

56.00 53.00 48.00 42.00 38.00 33.00 26.00 21.00 16.00

L^n2 55.00 52.00 48.00 41.00 36.00 33.50 26.00 22.00 15.00

Lin 3 55.50 53.00 47.00 41.00 37.00 33.00 28.00 22.00 16.00 Trung binh

AQ;lit/phut

0.50 1.00 1.00 1.00 2.00 0.50 2.00 1.00 1.00

1.10

Sai so tan

mat%

0.90 1.90 2.10 2.42 5.41 1.51 7.50 4.62 6.38 3.64

Bdng 2 Xdc dinh sai sd tdn mdt cda dp sudt P

TT

1

2

3

4

5

6

7

8

9

Q,lit/ph 54.00 51.00 47.00 42.00 39.00 34.00 25.00 23.00 17.00

Ket

L a n i 1.30 1.55 2.05 2.35 2.60 3.10 3.30 3.45 4.10

qua do P; MPa «

L i n 2 1.30 1.60 2.00 2.30 2.60 3.00 3.30 3.60 4.00

L i n 2 1.32 1.60 1.95 2.30 2.55 3.05 3.35 3.50 3.90

Trung binh

AP;MPa

0.02 0.05 0.10 0.05 0.05 0.10 0.05 0.15 0.20

0.086

Sal so %

1.53 3.16 5.00 2.16 1.94 3.28 1.51 4.27 5.00

3.09

Thiet bj da dugc thiir nghiem tai Xi nghiep Long Quan tren bg nguon thuy lyc mdi theo thilt

ke cd Pmax=5,0 MPa, Qniax=60 Ift/phut nhdm xdc djnh sai so tan mat khi do Q vd P So lieu do thi hien tai cdc bang I vd 2

III KET LUAN

Vdi viec sii dung thilt bj cho phdp kilm tra dugc cac dac tfnh vd thdng sd ky thuat co ban cua he thuy lyc P va Q tai mgi vj tri ciia he thdng thuy lyc; nit ngdn khdi lugng cong viec sua chira vd co the sir dung tot ban he sd dy trir ciia he thuy lyc; nang cao do tin cay ciia he thuy lyc trong su dung vd khai thdc

^ Hudng nghien cii:u tilp theo dd la hodn thien phdn dilu khiln va xir ly sd lieu; cai tiln kit cau theo hudng ggn nhe, co ddng linh boat

TAI LIEU THAM KHAO

[1] Nguyen Xuan Huy, Pham Nggc Hiing, Thdy luc, mdv vd truyin ddn ihuv khi HVKTOS

[2] Nguyen Thanh Trf, Hi thong thuy lire tren mdy cemg nghiip, NXB Da Ndng, 2004

[3] Phan Ba, Dao Mdng Lam , Do ludng sensor, Nha xuat ban Quan ddi nhan dan, 2000

[4] Le Van Doanh, Cdc bg cdm biin trong ky thudt do Iirdng vd dieu khien, NXB Khoa hge va

Ky thudt, 2004

[5] Nguyen Thanh Hdi, Ngd Thanh Hdi, Nguyen ly ehuyin ddi ANALOG <^ Digitcd, Nha xudt

bdn thanh nien, 2004

[6] Phan Qudc Phd, Nguyen Diic Chien, Gido trinh cdm biin, Tiirdng Dai bgc Bach khoa Ha

Ndi, 2004

[7] Hudng dan sir dung phdn mem WindOI-NV2 vd WindLDR 5.0