7/30/2019 TNG QUAN V H THNG M V KIM TRA KHUYT TT CA CHAI L THY TINH

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TNG QUAN V H THNG M V KIM TRA KHUYT TT CACHAI L THY TINH

1 Tng quan v h thng

1.1 Yu cu thc t:

Trong lch s pht trin ca ngnh cng nghip th thy tinh l 1 loi vt liu khngth thay th. Vi nhng u im vt tri so vi cc loi vt liu thy tinh v angc ng dng 1 cch rng ri cho cng nghip v i sng. Mt trong nhng ng dngrng ri v gn gi nht chnh l chai l thy tinh. Khng phi t nhin m chai l thytinh li c ng dng nhiu nh vy m bi bao b thy tinh c nhng u im nhtnh nh sau:

Tr, khng thm.

Trong sut, bt mt, to nn hnh nh ca mt sn phm cao cp.

C kh nng ti s dng cao.

Tuy nhin bn cnh nhng u im thy tinh cng c mt s nhc im nh : bn c km , d b khuyt tt trong qu trnh sn xut. Chnh v vy nhu cu v 1 hthng kim tra khuyt tt l iu thit yu trong cc nh my sn xut chai l. Trc kia,vic kim tra c thc hin bng mt v 1 s dng c n gin, c thc thin bi

nhng ngi cng nhn. Tuy nhin nng sut vn khng cao v li tn km. Tuy nhinvi s pht trin ca cng ngh ngy nay, vic kim tra khuyt tt c thc hin 1 ccht ng vi nng sut cao v chnh xc cao hn rt nhiu, ph hp vi mi trngcng nghip hin i by gi.

1.2 Mt s h thng trong thc t

7/30/2019 TNG QUAN V H THNG M V KIM TRA KHUYT TT CA CHAI L THY TINH

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2 M hnh thit k theo ti.

2.1 Hnh v

2.2 Nguyn tc hot ng:

H thng bao gm 2 h thng nh: h thng m v h thng kim tra khuyt tt.

h thng kim tra bao gm 3 trm: trm 1 kim tra kch thc chai l, trm 2 kimtra vt nt trn thn chai l, trm 3 kim tra trn ming v y chai l. Mi chai l khngt yu cu tng trm s b loi ra khi dy chuyn.

H thng m bao gm cc cm bin u vo v u ra m s chai l i qua.

Ngoi ra h thng cn tnh s lng chai l b loi ti mi trm cng nh s lng

chai l b loi trn ton dy chuyn . ng thi sau mi ca lm vic th t ng tnh hiusut lm vic ca ton dy chuyn.

2.3 Lu thut ton

2.4 Gii php cng ngh

2.4.1 Kim tra kch thc chai l:

trm ny cc cm bin s pht hin ra cc chai l c sai lch v kch thc, c th y l chiu cao v ng knh chai l.

Chiu cao ca chai l s nm trong 1 gii hn bao gm gii hn trn v gii hn di.Da vo y, ta s t mt b cm bin quang in dng thu pht mc gii hn ding thi trn mc gii hn trn ta cng t 1 b tng t. Nu 1 chai no khng nmtrong gii hn cho php th c 2 cm bin s khng tc ng khi chai thp hn hoc lc 2 cng tc ng khi chai cao hn gii hn cho php. y ta s s dng b cm binquang in loi E3Z-Laser c tia sng pht rt nh, cho php nh v v pht hin chnh xc vtc kch thc rt nh. Tia sng c th thy r bng mt thng nn lp t v chnh nh rt

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thun tin.

Cm bin dng thu pht c b pht v thu sng tch ring. B pht truyn nh sng i vb thu nhn nh sng. Nu c vt th chn ngun sng gia hai phn ny th s c tn hiu

ra ca cm bin. y ta s dng b thu pht E3Z-laser cn vi nhng u im sau:

Khong cch pht hin xa , pht hin tt trong mi trng nhiu bi. Kh nng xc nh v tr chnh xc ca vt th.

tin cy cao, pht hin c mi loi vt th (tr loi trong sut)

Kim tra ng knh ca chai ta s dng b m ha vng quay- encoder cng vicm bin quang in.

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y ta s dng b m ha vng quay E40 series, b cm bin quang BJ15Mloi thu pht. B ny hot ng theo nguyn tc khi no c vt ct ngang tia cacm bin quang th c tn hiu ra. Gi t l thi gian c tn hiu ra hay l thi gianvt i ngang qua tia, ng thi ly d liu t b m ha vng quang ta c c

vt tc ca vt l v. T ta tnh c qung ng vt i c khi ct ngang tiachnh l ng knh ca vt S= vt.

2.4.2 Kim tra vt nt trn thn chai.

pht hin vt nt mt cch nhanh nht v trit nht ta s s dng cng ngh thgic my tnh v x l nh. Cng c ny bao gm 1 modun thu thp nh v modun x lnh.

Hnh nh thu thp c x l, phn tch v so snh vi mu, nu c sai khc th b x

l s pht tn hiu ra. Nh cc my nh k thut s cho hnh nh nt cao v b vi x lmnh m th vic pht hin vt nt rt nhanh chng.

2.4.3 Kim tra khuyt tt ming v y l:

S dng cng ngh tng t nh trm kim tra vt nt trn thn, trm ny ta cngs dng 2 b camera k thut s v x l nh t pha trn ming l kim tra y vming l.

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2.4.4 Loi cc chai khng t yu cu: Khu loi chai khuyt tt ra khi dy chuyn l 1 c cu n gin bng kh nn , ciu khin bi cc khu kim tra v c t ngay sau mi khu. C cu kh nn ny

c iu khin bi tn hiu ra cc khu kim tra. Do c cu kh nn tc ng vn chmhn in nn cn tnh ton khong cch gia 2 chai lin tip cho hp l nht.

C cu loi chai sai yu cu

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2.4.5 m s lng

B m sn phm s dung cm bin quang. B phn cm bin: gm phn pht vphn thu. Thng thng ngi ta s dng phn pht l led hng ngoi pht ra nh snghng ngoi mc ch chng nhiu so vi cc loi nh sng khc, cn phn thu l

transistor quang thu nh sng hng ngoi.Do chai c kch thc ln nn khng yucu cao i vi b pht . tin cho lp t ta s s dng modun cm bin quang thupht E3F2. B cm bin ny nhy li nh gn nn rt c a chung

Cm bin quang E3F2