- May dao gau thu~ thich hgp kh6i dao cao hon m?tbdng may dUng va nang sudt cao.
a. 1)6 bAng cach I~t up thllng iii betong tl1 chay ra: LO(linay thuang co dung tich thung006«250lit), db OOaOO,hay dUng anm yeu cdu kh6i lugng be tong006.
6 Hinh 6.4: May Ir(ln be tilng eufulg blre e6lr\1e quay dUng
Hinh 6.4: May Ir(ln be tilng eufulg blre e6lr\1e quay dUng
1. D(lng co di~n; 2. H(lp giilm t6e; 3. Roto4. Canb Ir(ln; 5. Cua n~p; 6. Cua xil 4. Canb Ir(ln; 5. Cua n~p; 6. Cua xil
6.2.4. Tinh nang suat eua may trQn bi! tang
Nang suilt cua may trQn be tong duQ'c tinh theo cong thuc:
N =qsx .f. m . ktg; (m3/h) (6-1)
(6-2) Trong do:
qsx- Dung tich san xu~tcua thung trQn, (m\ .f -H~ s6 su~t li~u.
f = ~ (qb - dung tich be tong dii trQn duQ'c; qsx- dung tich san xu~t Clla thtmg trQn) qsx
+N€u trQn be tong thi: f= 0,65+0,70 + N€u trQn voi viia thi: f=0,75+0,85 ktg - H~ s6 thiYigian Slr d\lng may.
. . 3600
m - So coi be tong trQn duQ'c trong I giiY. m = ----
tl - ThCrigian dB v~t li~u vao thimg trQn, (s) (tt = 15+20 s). t2 - ThCrigian trQn v~t li~u, (s) (t2 =60+ 120 s).
t] - ThCrigian dB be tong ra, (s)
+N6u thimg I~t va nghieng dB (t] = 10 + 20 s).
+N6u thimg dB bfuIg may (t] = 15 + 30 s).
2. May trQn CIlii'ng bllc bOllt dQng lien ty.c: (may trQn culing blrc bfulg vit trQn quay ngang) (Hinh 6.5)
May trQn be tong lien t\lC la lolli dugc sir d\lDg rQng rai trong cac cong trinh xay d\IDg doi hOi kh6i luqng be tong 100. May trQn hOllt dQng lien t\lC de san xu~t ra h6n hqp be tong co nang xu~t r~t cao, co the d<lt120m%
., , ,I -f[J11ilJl f1i. f-' I I 1" 6; 5 I." 1. I --iJ i
Hlnh6.5: May tr(\n cui'ingbilc co tr\lCn~ ngang hOlltd(\ng lien Wc
1- Thimg tr(\n; 2- Canh tr(\n; 3- Cii'axa; 4- H(\p giiun t6c; 5-B(\ truy8n d(\ng dai; 6- D(\ng ccrdi~n.
Khi lam vi~c h6n hqp be tong duqc dB vao thimg qua mang c~p li~u, nha cac canh trQn (2) co cau 1<10d~c bi~t va dugc b6 tri theo cac huOOg va vi tri thich hqp rna ph6i li~u trong thUng khong nhihlg dugc chuyen dQng deu rna con chuyen dQng dl1n v~ phia cira do san ph~ (3). Chi~u dai Clla thimg trQn phai dam bao sao cho thai gian ph6i li~u di tir ddu nay sang ddu kia cua thung dUng bfuIg tMi gian trQn d~u v~t li~u.
6.3. MAy DAM BE TONG6.3.1. Khaini~m