KHOA HOC CONG NGHE
NGHIEN cufu l]fNG DUNG HE THONG THUf BOlM THUY LlTC TRONG THUf, KIEM NGHIEM HOAT DONG VA CHINH DINH CAC LOAI BOM THUY LlTC
Tom tat: Cdng nghe sda chUa thiet bj tau thuy ngay cang ddi hoi sU hoan thien ve chat lUdng, do chinh xac khi gia cdng phuc hoi, che tao mdi eac ehi tiet thay the...
Dac biet vdi nhUng thiet bi yeu cau do chinh xac rat cao trong sda chua phuc hdi cac thdng sd ky thuat edng tac, nhu bdm thCiy luc, md td thijy luc dUdc trang bj phd bien tren eac doi tau bien, gian khoan... He thdng thiet bi thd bdm thCiy lUc la san pham chuyen dUng de thu, kiem nghiem hoat ddng va chinh dinh eac loai bdm thuy lUc. He thdng thiet bi thd bdm thuy lUc cd nhung uu viet dac trUng cua he thdng ky thuat sd: do chinh xac, tinh dn dinh, tinh thich Ung, kha nang ket ndi vdi may tinh PC, kha nang lUu trU va phan tich ket qua thd.
1. Gidi thieu chung ve thiet bj t h d bdm thuy luTc He thdng thd bdm thuy lae la thiet bj chuyen dung, dung de thd nghiem, kiem tra va chinh dinh cae loai bdm thuy lpc tren cae tau bien, gian khoan sau khi sda ehda. Tren the gidi, cae hang che tao bdm thuy luc ndi tieng nha Hydae, Parker, IHI... deu phat trien eac loai bang thd chuyen dung cua tdng hang. Day la mot thiet bj khdng qua phde tap ve mat eau true va hoat dpng, tuy vay bang thd la thiet bj khdng the thieu dapc ddi vdi cac nha may sda ehda tau bien, gian khoan.
Tai Tradng Dai hpc GTVT TP Hd Chf Minh, viee
MA
Hinh 1. Bang thd thuy luc PInionshart
TS. T R U d N G T H A N H DUNG Trudng Dai hgc Giao thong van tai TP. HCM nghien cdu, che tao bang thd dung de thd nghiem cac loai bom thuy lac, md td thuy lac cung la thiet bj rat can thiet phuc vu dao tao nganh May tau thuy, Dien- Ta dpng tau thuy, may xep dd, cac Idp huan luyen thuyen vien...
Hinh 4. Bang thd thuy luc Avtron
Hinh 2. Bang thd thuy iuc AIDCO
Hinh 3. Bang thCf thuy lUe Titan
He thdng thd bdm thuy lae eho phep:
Xac djnh va ket luan d i y du, chfnh xae trang thai cua thiet bi thuy lac dape thd.
Xae nhan cho phep daa thiet bj thuy lae sau khi sda ehda vao van hanh.
- Giup tiet kiem thdi gian trong qua trinh bao dadng sda ehda thiet bj thuy lac.
- Nang cao c h i t lapng sda ehda.
Xac nhan va danh gia dung hieu qua cua cac phapng phap sda ehda de ra.
Npi dung chfnh eua viee thd thiet bj thuy lac la tao dieu kien cho bdm/motor lam viee trong eac trang thai hoat dpng khac nhau vdi sa thay ddi eua:
* Tde dp quay Lau lapng dau Ap lac d i u
Nhiet dp dau (optional)
Trong qua trinh thd, cae dai lapng vat ly sau dddc do de danh gia trang thai cua bdm thuy lae:
Lau lapng vao/ra.
KHOA HOC - CONG NGHE I d , 'M i I jib'
Ap lac dau vao/ra.
* Tde dp vdng quay.
Momen d i u vao.
Sa rd ri.
* Hieu s u i t the tieh.
* Hieu s u i t ed.
* Tdng hieu s u i t . Nhiet dp d i u thuy lac
2. Phan tich cac hoat d p n g cua che dp thCr Muc dich cua viec thd bdm thuy lac la tao dieu kien cho bom lam viee dadi cac che dp tai khac nhau:
- Lau laPng eua bdm thay ddi: bang each thay ddi tde dp eua ddng ed d i n dpng.
- Ap lac d i u do bdm cap thay ddi: thay ddi ap s u i t d i u ra cua bdm.
Ve mat nguyen ly, sd dd nang lapng eua thiet bj thd bdm thuy lae cd sd dd nha tren hinh 5.
Khop noi thiet bj do v momenl va toe do
••.an dieu khien as -^
suat Thay 'i?j> tai N.^
Hydraulic Pump Source
1 PF'
Hydraulic Motor
2
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aulic / I I I Tested
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Tiel luu aieu fchsen . loc 66 l/otor hieu Bletii off
Hinh 5. Stf dd nang lugng thiet bi thd bdm Cac thiet bj chfnh trong he thdng bao gdm:
1- Bdm ngudn thuy lUe; 2- Ddng cd thuy lUc lam ddng cd din ddng cho bdm dUde thd; 3- Bdm dUdc thd;
4- Valve lUu luang PPF, dUng de dieu khien luu lUdng di qua ddng cd 2, qua dd dieu khien tde dd true quay cua ddng cd; 5- Valve ap suat (presure relief valve) PPV, dieu khien ap sua't dau ra eCia bdm dUdc thd.
Tren sd dd nay viec tao ra cac che dp vdi lau lapng va ap s u i t khac nhau cua bPm thd dapc thuc hien nha sau:
Thay ddi lUu lUdng: Thay ddi tde dp ddng ed 2 bang dieu tiet valve PFV sd 4, (dieu khie'n lUu lapng kieu bleed of). Valve PFV md cang rdng thi lau lapng d i u di qua Hydraulic motor 2 cang ft, lam giam tde dp dpng CP d i n ddng.
' Thay ddi ap sua't lam viee eCia bdm thd: bang thay ddi ap s u i t dat tren valve PPV sd 5. Valve nay cang bdp lai thi ap s u i t d i u thuy lae d i u ra cua bdm thd cang cao.
3. Danh gia ket qua t h d bang do lUdng
Trong qua trinh thd, cac dai lapng vat ly sau dUdc do de danh gia trang thai cua bdm thuy lac.
- Luu lUdng vao/ra: do bang flow transmetter, tfnh hieu do daa ve. PLC va hien thj tren man hinh va may tfnh PC
Ap luc diu vao/ra: do bang ddng hd ap s u i t de hien thj. Ngoai ra cam bien ap s u i t gdi tin hieu ve PLC, gia trj do dapc hien thj tren man hinh dieu khien.
Too do vdng quay: do b i n g Rotary encoder, tfn hieu daa ve PLC de hien thj va dieu khien ta ddng.
Momen dau vao: do bang cam bien torque tren true d i n ddng.
- Nhiet do dau thuy lUc: do bang cam bien.
4. Cac che dp hoat dpng ban tif dpng va tU dong cua thiet bj t h d bdm
" Che do ban tU ddng: 0 che dp ban ta ddng ngudi van hanh se theo ddi eac ket qua do dape, va chinh djnh cae thdng sd dieu khien thdng qua man hinh cam dng dieu khien hoae tren PC.
- Dieu khien lau lapng: Ngadi van hanh dpc gia trj lau lapng do dape. De tang/giam lau lapng cua bdm thd, cai dat gia trj tren valve PFV de thay ddi tde dp eua Hydraulic motor.
- Dieu khien ap s u i t : Ngadi van hanh doe gia trj ap s u i t d i u ra cua bdm thd do dapc. De tang/giam ap s u i t eua bPm thd, cai dat gia trj tren valve PPV de thay ddi ap s u i t dau ra.
* Che do tu ddng: d che dp ban ta ddng ngadi van hanh se dat ra gia trj lau lapng/ap s u i t yeu e i u , PLC do cae dai lapng c i n dieu khien va thae hien dieu khien ta ddng thdng qua eac bd dieu khien PID ben
.So cTo nguyen !v chA iJo Test Pump
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Sa (56 nguyen ly che (?0 Test Pump
Sa 66 ai^u khi^n 6n dinh luu luang \ii ap suit Pump flu'ac thu-
Hinh 6. So dd dieu khien thiet bi thd bdm trong. Sd dd nha hinh 6.
- Dieu khien lUu lUpng: Ngadi van hanh cai dat gia trj lau ladng len man hinh dieu khien, PLC nhan gia trj nay, do lUu lapng d i u ra va tu ddng dieu chinh valve PFV de thay ddi tde dp Hydrraulic motor d i n ddng
- Dieu khien ap s u i t : Ngadi van hanh cai dat gia trj ap s u i t dau ra eua bdm len man hinh dieu khien. PLC nhan gia trj yeu e i u , dpc gia trj thae te do dupe dieu khien valve PPV de' thay ddi ap s u i t dau ra.
5. Ket luan
Bang thd bdm thuy lae la mot thiet bj chuyen dung khdng qua phde tap nhang ed cdng dung r i t cao.
Phien ban bang thd dieu tde ky thuat sd cho phep nang cao chat ladng bang thd, thae hien eac phan tieh phep thd va chinh djnh trong thdi gian qua dp. Day la mdt VI du cu the ve viec dng dung cdng nghe tu ddng va edng nghe thdng tin vao viee nang cao chat lapng eac san pham edng nghiep. Mdt khfa canh c i n tfnh den la bang thd thuy lac dng dung ky thuat sd ed gia thanh t h i p hdn gia thanh nhap ngoai r i t nhieu l i n •
Tai lieu tham khao [1]. www.avtronaero.com [2]. www.ms-d.com
[3]. www.pressurepumponline.com [4]. www.titansystems.com
[5]. www.pwrtst.com
