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1. KHAI NIM1.1. B tri mt sang Phn loai may sang 1.1.1. Co 2 phng phap b tri mt sang Kich thc l sang t nho n ln hay con goi la phng phap b tri ni tip, xem hinh (H16.1)

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1.1.1. Co 2 phng phap b tri mt sang Kich thc l sang t ln n nho hay con goi la phng phap b tri song song, xem hinh (H16.2). Trng hp nay cho cac mt sang chng ln nhau, mt trn l sang ln, di l sang nho

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1.1. 2. Phn loai may sang 1.2. So sanh sang ly tng va sang thc t

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1.3. Cn bng vt cht qua sangTa goi: F: nng sut hn hp nhp liu; kg/h D: sut lng vt liu trn sang; kg/h

B: sut lng vt liu di sang; kg/h xF: phn khi lng vt liu (A) trong nhp liu xD: phn khi lng vt liu (A) trong phn oan trn sang xB: phn khi lng vt liu (A) trong phn oan di sang Nng sut hn hp nhp liu gm vt liu (A) trn sang va (B) di sang, xem hinh (H16.3b) thi phn khi lng (B) co trong nhp liu la (1 - xF), co trong phn oan trn sang (1-xD) va trong phn oan di sang la (1 xB)

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1.3. Cn bng vt cht qua sang (tt) em cn bng khi lng tng cng F=D+B (16 1) Cn bng khi lng theo (A) F.xF = D.xD + B.xB (16 2) Chia hai phng trinh (16 1) va (16 2) cho (B) ta co:

D xF - xB F xD - xBChia cho (D) ta co:

B = F

xD - xF xD - xB

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1.3. Cn bng vt cht qua sang (tt)Hiu sut sang la mc phn tach vt liu (A) va (B) t nhp liu. Nu sang lam vic hiu qua thi tt ca vt liu (A) se trn sang va tt ca (B) se di sang. Vy hiu sut sang la ty s gia lng vt liu (A) trong phn oan trn sang vi lng (A) co trong nhp liu. D.x D Tinh theo phn oan trn sang, vi nhp liu:A F.x F B1 - x B Tinh theo phn oan di sang vi nhp liu: B F1 - x F

Hiu sut chung la tich s cua hai hiu sut trn:

x F - x B x D - x F 1 - x B .x D . . = A .B = x D - x B 2 1 - x F .x F

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1.4. Cu tao b mt sangLi an: dung phn loai cac hat nho va min, c lam t vt liu nh: tre, my, si kim loai va mt s vt liu khac, l san thng co dang hinh vung, ch nht hay luc giac.

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1.4. Cu tao b mt sang (tt)Tm uc l: lm t cc tm kim loai trn o ngi ta tao hnh dang l khc nhau nh hnh trn, elip, bu duc, dung

phn loai vt liu c kch thc D2 > 5mm

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1.4. Cu tao b mt sang (tt) Thanh ghi hay tm ghi: Dng phn loai cc vt liu D1 80mm, gm cc hng ghi tao theo chiu doc sng m khe h gia hai hng ghi chnh l kch thc lot qua sng D2.

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1.5. Cac thng s cua may sang

Kich thc l sang D

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1.5. Cac thng s cua may sang

Kich thc mt sang Chiu di sng anh hng rt ln n qu trnh sng, chiu di ti u ca sng tnh theo

L K.

B.h.t 0,785 .D .Z02

; mm

sang c cn i va d ch tao thi:

L 1,2 1,5B; mm

1.6. Cac yu t anh hng n qua trinh sang Khi kich thc san phm D2 1mm Dng sng Khi kich thc san phm D2 < 1mm Dng ry

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2. GII THIU MAY SANG THNG DUNG 2.1. May sang lc phng

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2.2. May sang rung

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2.3. May sang thung quay