Txiv tsawb screen, uas yog vaj huam sib luag thickness screen, rau cov duab thiab txiv tsawb zoo ib yam li lub npe, lub hauv paus ntsiab lus ntawm kev tshuaj ntsuam nyob rau hauv 1965 los ntawm Fabkis E Boerstlein ua ntej muab tso rau pem hauv ntej lub vaj huam sib luag thickness tshuaj ntsuam txoj kev.
1 Txoj Cai Ua Haujlwm
Ntawm no yog yuav ua li cas lub txiv tsawb screen ua haujlwm. Lub npov lub rooj zaum hom kev txhawb nqa ntawm lub caij nplooj ntoos hlav, kev siv cov kev taw qhia excitation quab yuam tsim los ntawm shaker, kom lub npov npo rau oblique reciprocating vibration.is daim duab qhia kev ua haujlwm ntawm lub shaker. Ob pawg ntawm eccentric blocks (M1=M2) nyob rau hauv lub shaker ua hauj lwm nyob rau hauv synchronous rov qab motion. Nyob rau hauv txhua txoj hauj lwm tam sim ntawd, lub zog centrifugal raws li X-x kev taw qhia ntawm lub zog tivthaiv ib txwm tso tseg, thiab raws Y-Y kev taw qhia ntawm lub zog tivthaiv yog ib txwm superimposed rau ib leeg, yog li ntawd, tsim ib leeg raws Y-Y kev taw qhia ntawm lub zog siab, tsav lub npov npo rau reciprocating linear motion.
2. Kev txiav txim siab ntawm kinematic tsis
(1) lub amplitude A
Feem ntau, thaum siv rau txiv tsawb npo, me me amplitudes yuav tsum tau siv. Linear vibrating screen amplitude A=4-6mm, ntawm no coj A=5mm
Installation Angle.
(2) Installation Angle. Namely, lub kaum sab xis ntawm qhov screen nto thiab lub dav hlau kab rov tav. Lub qhov screen rau ntau tshaj 50mlm linear screen inclination Lub kaum sab xis ntawm 5℃~ 10 degree. txiv tsawb screenrau tsib ntu, pib los ntawm kev noj zaub mov kawg ntawm 30 degree, 22.5 degree, 15 degree, 7.5 degree, 0 degree.
Loj ejection Angle beta.
(3) nyob rau hauv lub txiv tsawb npo, lub ejection Angle yog hais txog lub kaum sab xis ntawm lub vibration kev taw qhia thiab kab rov tav, thiab lub ejection Angle yog 45 degree.
3. Kev suav ntawm kinetic tsis
Ib feem ntawm cov kev ntsuas tsis tau ntawm txiv tsawb npo: kev khiav hauj lwm zaus: F =14HZ parameter vibration hnyav: M=15000kg. Qhov chaw ntawm lub vijtsam: S=18.6m2
3.1 Lub zog ntawm kev co cais lub caij nplooj ntoos hlav K
K = M x ῳ n2 = M x 2 (ῳ / p)
Hom: ῳ rau kev ua haujlwm angular zaus ntawm vibrating npo, ῳ=840 PI / 30=87.92 rad/s;
P yog qhov kev vibration zaus piv, teeb P =5;
Tom qab ntawd, raws li cov qauv, K=4637955.84N/m
3.2 Lub vibration quab yuam yuav tsum tau los ntawm lub vibrating npo P
P=MA ῳ 2
Qhov twg: A yog tus shaker ib leeg Zhenfu, A=5mm.
Hloov mus rau hauv cov qauv, P= 579744.48n
3.3 Lub cev muaj zog xav tau rau shaker N
N = 1 ŋ / (N1 + N2)
Qhov twg: N1 yog vibration zog, kW; N2 yog kev sib txhuam fais fab, kW; ŋ yog kis tau tus mob, ŋ=0.9 ~ 0.95.
Lub zog vibration: N1=MA2n3c/1740 qhov twg: C yog damping coefficient, C =0.2; N yog qhov vibration zaus (rotational speed), n= 900R /min. Hauv cov qauv, N1=31.4kW
Kev sib txhuam fais fab N2= MAN3FD2/1740
Qhov twg: F yog qhov sib txhuam coefficient ntawm dov bearing, f=0.003; D2 yog txoj kab uas hla ntawm phau ntawv journal, D2 =0.080m; Yog tias N2=7.5kW, N=1/0.95 × (31.4+7.5)=41kW
4. txiv tsawb screen finite element tsom xam
Lub finite element tsom xam software tuaj yeem siv rau kev suav lub zog, thiab kev tsim qauv zoo tuaj yeem txhim kho tau zoo los ntawm kev hloov kho tas li ntawm daim duab thiab rov suav dua.
4.1 Tsim cov finite element qauv ntawm txiv tsawb npo
Tus qauv shaker tau yooj yim, thiab cov khoom tsim nyog tau xaiv hauv ANSYS, xws li SHE1163 thiab Combine14 los tsim covtxiv tsawb screenfinite element tsom xam qauv, raws li qhia hauv daim duab 2.
2 Finite element tsom xam qauv ntawm txiv tsawb npo
4.2 Statics tsom xam ntawm txiv tsawb npo los ntawm ANSYS
Los ntawm kev soj ntsuam zoo li qub, qhov kev ntxhov siab tuaj yeem pom, los ntawm kev rov tsim cov kev hloov kho thiab kev txheeb xyuas software, kom txog rau thaum lub sieve lub thawv qauv zoo. [FIG. 3 yog daim duab qhia kev ntxhov siab ntawm lub thawv sieve ntawm txiv tsawb npo. Qhov kev ntxhov siab yog qhov tseem ceeb ntawm txoj hauj lwm nyob ib sab ntawm lub rooj zaum lub caij nplooj ntoos hlav thiab sab phaj. Txij li thaum lub phaj ntsug txuas nrog lub caij nplooj ntoos hlav lub rooj zaum thiab sab phaj thiab lub phaj phaj ntawm sab hauv phab ntsa ntawm sab phaj raug tshem tawm thaum lub sij hawm ua kom yooj yim ntawm cov qauv, qhov kev ntxhov siab ntawm no tuaj yeem tsis quav ntsej.
FIG. 3 Stress distribution diagram of sieve box
5 xaus
Kev soj ntsuam zoo li qub yog ua los ntawm ANSYS software, uas muab lub hauv paus theoretical rau kev txhim kho cov qauv ntawm cov txiv tsawb npo.
