8/2/2019 Chuong 7 - PP Thiet Ke
1/13
PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7
I. PHNG PHAP IEU KHIEN THEO NHP
Trong ky thuat ieu khien theo nhp, th tn hieu se c thchien trong nhp o, khi nhp tiep theo c thc hien th nhp trc ophai c xoa va ong thi muon nhp tiep o c thc hien thphai co tn hieu thong bao cua nhp trc o
Nh vay khoi cua nhp ieu khien gom cac chc nang sau :
Chuan b cho nhp tiep theo Xoa cac lenh cua nhp trc o Thc hien lenh cua tn hieu ieu khien
Chuoi ieu khien theo nhp c trnh bay hnh sau :
e thc hien viec thiet ke mach theo phng phap ieu khientheo nhp, ta can tuan theo cac nguyen tac sau :
1. T s o hanh trnh bc a cho (hoac t yeu cau cong nghe, tathiet lap s o hanh trnh bc) ta ve c bang trnh t cac nhpnh sau:
Nhp thchien
1 2 3 4
Xy lanh A+
B+
B-
A-
Nhan tn hieu Start S2 S4 S3Nam chamien
Y1 Y3 Y4 Y2
2. Mac du ta s dung van ien t co duy tr, nhng moi nhp eu comot mach t duy tr. Sau khi nhan nut khi ong, lan lt nhp 1 choen cac nhp tiep theo. Se ong mach. Nhp cuoi cung tac ongcho qui trnh tr
3. ve v tr ban au. Nhp tiep theo c thc hien, th nhp trc ophai c xoa.
H.V.A.-3/2005 Trang 116
A1
A1
A2
A3 A4
X1
X2 X3 X4
Zn+1
Yn+1
Zn
Yn
8/2/2019 Chuong 7 - PP Thiet Ke
2/13
PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7V du 1
Cac chi tiet sau khi ong goi, can c di chuyen sang mot day
chuyen khac bang mot he thong ieu khien ien Kh nen nh sau :Nhan nut nhat Start xy lanh tac ong hai pha A i ra nang chi tietlen, en cuoi hanh trnh xy lanh tac ong hai pha B i ra ay chi tietsang day chuyen ke tiep, sau o xy lanh A quay tr ve, va tiep theoxy lanh B quay ve hoan tat mot chu trnh. Hay ve mach ieu khienien Kh nen.
1. Lap bang ieu khien, chon Van ien t loai ieu khien nay, ta chon Van ien t hai au co hai cuon
day, ngha la loai Van ien t duy tr. Ta lap bang ieu khien nh sau :
Nhp thc
hien
1 2 3 4
Xy lanh A+ B+ A- B-
Nhan tn hieu Start a1 b1 a0Nam chamien
Y1 Y3 Y2 Y4
2. Ve s o ieu khien Kh nen
3. Ve mach ieu khien ien
Bc 1Nhan nut nhan Start, cuon day K1 nhanh 1 co ien, tiepiem K1 nhanh 2 ong lai, duy tr cho cuon day K1, ong thi
H.V.A.-3/2005 Trang 117
a1
a0
A
B b1
Xy lanh B
Xy lanh A
A Ba1
a0
b1
Y1 Y2 Y3 Y4
8/2/2019 Chuong 7 - PP Thiet Ke
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8/2/2019 Chuong 7 - PP Thiet Ke
4/13
8/2/2019 Chuong 7 - PP Thiet Ke
5/13
PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7
Bai tap ng dung :
Bai tap 1
Mot chi tiet can khoan mot lo khoan,va c ieu khien bi he thong ieukhien sau:
Cac chi tiet c at trong mot gia, nhan mot nut nhan xy lanh tac ongkep 1.0 i ra ay chi tiet vao v tr gia congong thi cung kep chat chi tiet, sau o xylanh tac ong kep 2.0 c gan vi aukhoan i ra cham e thc hien cong viecchuyen ong chay dao; cuoi hanh trnh xylanh 2.0 t quay ve nhanh; sau o xy lanh 1.0quay ve e thao kep; va cuoi cung xy lanhtac ong n 3.0 se i ra ay chi tiet va
thc hien xong vao thung at ke ben va hoan tat mot chu trnh.Bai tap 2
H.V.A.-3/2005 Trang 120
xA
8/2/2019 Chuong 7 - PP Thiet Ke
6/13
PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7Tam thep X c uon cac goc 900 bang he thong ieu khien
sau:Tam thep c a vao bang tay, sau khi nhan nut Start, xy lanh
tac ong n A kep tam thep, xi lanh B i ra uon chi tiet goc 900 valap tc quay tr ve, xy lanh C i ra uon tiep e hoan tat, cuoi cunglan lt xy lanh C va A quay tr ve, chi tiet c lay ra bang tay.
Bai tap 3Chi tiet can khoan 2 lo giong nhau, c ieu khien bi he
thong sau:Chi tiet c ng trong ga ; sau khi nhan nut Start xy lanh tac
ong kep 1.0 i ra ay chi tiet vao v tr gia cong, ong thi chi tietcung c kep chat, xy lanh 2.0 c gan vi au khoan i ra thc hien
chuyen ong chay dao, cuoi hanh trnh t quay ve; sau o xy lanh 3.0 ira e di chuyen chi tiet sang v tr th hai; luc nay xy lanh 2.0 lai i rae khoan lo th hai, cuoi hanh trnh xy lanh 2.0 quay ve lai v tr lo thnhat; cuoi cung xy lanh 1.0 i vao e thao kep hoan tat mot chutrnh.
Bai tap 4
Mot tam kim loai mong (tole) cdap bi mot he thong ieu khien bangien Kh nen nh sau : Chi tiet c a vao v
tr dap bang tay; e dap ngi ta nhanong thi hai nut nhan lam cho xy lanh A i radap tam kim loai theo bien dang nh san. Saukhi cuoi hanh trnh cua xy lanh A, xy lanh B i rae ay tam kim loai ra khoi v tr dap Hoan tat mot chu trnh.
Bai tap 5
Mot chi tiet can gia cong bi mot he thong ieu khien ien-Kh nen nh sau: Chng trnh 1 : Khoan
Chi tiet ch c khoan va kep bang tay. Sau khi nhan nut Start,chi tiet se c khoan (xy lanh A ) Chng trnh 2 : Khoan va Doa
Giong nh chng trnh 1, nhng chng trnh nay, chi tiet conc tiep tuc thc hien bcdoa lo, ca hai chong trnh chitiet eu c kep bang tay.
Sau khi nhan nut chon
chng trnh va nut Start, chi tietbat au khoan bi xy lanh A,cuoi hanh trnh, xy lanh B i ra
H.V.A.-3/2005 Trang 121
Xy lanh 2.0
Xy lanh1.0
Xy lanh 3.0
8/2/2019 Chuong 7 - PP Thiet Ke
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PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7ay chi tiet sang v tr doa, khi doa xong lo, xy lanh C i tr vao; ke tiepxy lanh B i vao e tr ve v tr cua au khoan; va cuoi cung chi tietc thao ra bang tay.
Nut nhan chon chng trnh can phai c nhan trc nut Startkhi chon chng trnh 2
II. PHNG PHAP IEU KHIEN THEO TANG
oi vi phng phap nay, nh a trnh bay phan I; tuy nhienv ay la ieu khien ien Kh nen nen co nhng khac nhau nhsau :
Trong ieu khien Kh nen th tn hieu vao la Kh nen; con ieukhien bang ien th tn hieu vao la tn hieu ien. e chuyen oi tang, trong ieu khien Kh nen ngi ta dung cacphan t Logic nh cac Van AND hoac Van OR; nhng ieu khien ienth cac lien ket AND hoac OR thng c ve bang cach mac cactiep iem noi tiep hoac song song. Trong ieu khien Kh nen, trong s o hanh trnh bc co n tang, thta se co (n-1) van ao tang ( ay chnh la Van ao chieu 4/2 hoac5/2 duy tr); con trong ieu khien cac relais th cac Van ao tang cthay the bang cac cuon day tng ng
S o ieu khien mach 2 tang
S o ieu khien mach 3 tang
H.V.A.-3/2005 Trang 122
Start
+2
4V
E1
E2
K1
K1
K1
T1 T2K1
0V
+24V
0V
K1
E3 E2
E1
T1
K1Start K1
K1
K2
K2K2 K2
T1T2 T3
8/2/2019 Chuong 7 - PP Thiet Ke
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8/2/2019 Chuong 7 - PP Thiet Ke
9/13
PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7
V du 1:Cac chi tiet sau khi ong goi, can c di chuyen sang mot day
chuyen khac bang mot he thong ieu khien ien Kh nen nh sau :Nhan nut nhat Start xy lanh tac ong hai pha A i ra nang chi tiet
len, en cuoi hanh trnh xy lanh tac ong hai pha B i ra ay chi tietsang day chuyen ke tiep, sau o xy lanh A quay tr ve, va tiep theoxy lanh B quay ve hoan tat mot chu trnh. Hay ve mach ieu khien
ien Kh nen.
Bai giai :
Bc 1T yeu cau cong nghe, ta ve s o hanh trnh bcTa nhan thay, mach ieu khien bao gom co 2 xy lanh, trong o xy
lanh A va B la hai xy lanh tac ong hai pha.
Bc 2
Ta tien hanh chia tang, nh a trnh bay phanMach ieu khien c chia ra lam 2 tang gom :- Tang 1 : A+ B+
- Tang 2 : B- A-
Lu y hai cong tac chuyen tang :- E1 la a0- E2 la b1
H.V.A.-3/2005 Trang 124
a1
a0
A
B b1
Xy lanh B
Xy lanh A
8/2/2019 Chuong 7 - PP Thiet Ke
10/13
PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7
Bc 3Ve s o mach Kh nen
Bc 4Ta tien hanh thiet ke mach 2 tang:
Bc 5 Ve mach ieu khienien
V du 2:Mot chi tiet can khoan mot lo khoan, va c ieu khien bi
he thong ieu khien sau:
Cac chi tiet c at trong mot gia , nhan mot nut nhan xylanh tac ong kep 1.0 i ra ay chi tiet vao v tr gia cong ong thicung kep chat chi tiet, sau o xy lanh tac ong kep 2.0 c gan vi
H.V.A.-3/2005 Trang 125
Y1
Ba0A a1 b0 b1
Y2 Y3 Y4
Star
t
+24V
E1
E2
K1 K1 K1
T1 T2
K1
0V
0V
K1
+24V
V
Start
b1
a0
Y1
Y3 Y2
a1
K1K1K1
Y4
b0
8/2/2019 Chuong 7 - PP Thiet Ke
11/13
PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7au khoan i ra cham e thc hien cong viec chuyen ong chay dao;cuoi hanh trnh xy lanh 2.0 t quay ve nhanh; sau o xy lanh 1.0 quay vee thao kep; va cuoi cung xy lanh tac ong n 3.0 se i ra ay chitiet va thc hien xong vao thung at ke ben va hoan tat mot chutrnh.
Bai giai :
Bc 1
T yeu cau cong nghe, ta ve s o hanh trnh bc
Ta nhan thay, mach ieu khien bao gom co 3 xy lanh, trong o xylanh 1.0 va 2.0 la hai xy lanh tac ong hai pha, con xy lanh 3.0 la xy lanhtac ong mot pha.
Bc 2Ta tien hanh chia tang, nh a trnh bay phan
H.V.A.-3/2005 Trang 126
1
A
B
C
S2
S3
S1
32
2 31
S4
S6
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PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7Mach ieu khien c chia ra lam 3 tang gom :
- Tang 1 : A+ B+
- Tang 2 : B- A- C+
- Tang 3 : C-
Lu y hai cong tac chuyen tang :- E1 la S5- E2 la S4- E3 la S6
Bc 3Ve s o mach Kh nen
Bc 4Ta tien hanh thiet ke mach 3 tang:
H.V.A.-3/2005 Trang 127
+24V
0V
K1 K2
E3 E2
E1
T1 T2 T3
K2
K2 K2
K1 K1 K1Start
Y1
2.0 3.0S11.0 S2 S3 S4 S5 S6
Y2 Y3 Y4 Y5 Y6
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PHNG PHAPTHIET KEMACH
Mon : IEN - KHNEN
Chng :7
Bc 5 Ve mach ieu khien ien
H.V.A.-3/2005 Trang 128
+24V
K1 K2
S6 S4
S5
Y1
Y2 Y5
K2 K2 K2
K1 K1K1
Start
0V
Y3 Y4 Y6
S2 S1 S3
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