Application
Bucket elevators are used for vertical transport of bulk materials. The fast-running F LS bucket elevators c an handle lumps up to 50 mm in size and can withstand temperatures up to 350oC. The FLS fast-running elevator is designed for centrifugal discharge. The c apacities given o n the dimensioning graphare with 75% filling of the buckets whereas the corresponding motor size is calculated for 100% filled buckets. The chain speed is 1.0-1,9 m/s. FLS also supply slow-running elevators with a chain speed of 0.40-0.63 m/s. It is recommended to have the FLS bucket elevator equipped with a barring drive. The elevator chains, dimensioned to DIN 764 and DIN 766 specifications, are made of special hardened steel.
Design and operation
The FLS designed chain bows are furthermore hardened at wearing points. The elevator is designed to DIN 15251 and the bucket is designed to DIN 15234 specifications and, in addition, reinforced on the back plate. When used for abrasive materials the digging edge is also reinforced. The elevator design allows for the buckets to dig in the material which inevitably collects in the bottom of the casing. The drive station comprises roller chain transmission and gear unit with backstop. Hydraulic coupling is mounted between gear unit and motor when motor power exceeds 55 kW. Take-up bearings have easily replaceable, selflubricating bushings. The maintenance requirements of the F LS bucket elevators are negligible. Chain wheels have replaceable segment rims. The type designations (e.g.H 800) of the FLS bucket elevators indicate fast-running type (H) and bucket width in mm.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Drive station Chain bow Barring drive Inspection door Outlet Casing Mounting door Take-up station Inlet Chain wheel Chain wheel Bucket Cover Roller chain transmission Back-top Gear Coupling Motor
The capacity (t/h) of a bucket elevator depends on the lifting height (m), the bulk density of the material (kg/I), the volume per time unit (m 3/h), and chain speed (m/s).
Example 1: Desired capacity: Raw meal with a bulk density of 0.8 kg/I to be lifted 50 m (C) at a rate of 70 t/h ~ 88 m 3/h.
Example 2: Desired capacity: Cement with a bulk density o 1.2 kg/I to be lifted 40 m (C) at a rate of 310 t/h ~ 260 m 3/h.
The type selection diagrams are based on 75% degree of filling and the chain speed concerned (1.0-1.9 m/s).
Solution: All three parameters are plotted on the diagrams in the middle. Size H 500 can only lift this load up to about 30 m (—), while size H 630 has the plotting “L” in the coloured sector, and the plotting “V” in the yellow sector, and is thus suitable for the task.
Solution: All three param eters are plott ed on the dia grams to the right. Size H 1000 has the plotting “L” in the red sector, and the plotting “V” in the yellow sector, and is thus suitable for the task
When sizing an elevator, both the volume “V” and the load “L” must be plotted. “V” should be within the yellow sector, while “L” should be in either the red or yellow sectors. The motor size (blue curves) depends on lifting height (m) and performance(t/h).
Size
) m m ( s n o i s n e m i D
A B D E F G H K L M N P R S T U
H 160 H250 H 400 Single casing 160 400 520 720 315 280 700 650 1190 200 310 585 500 485 900 630
kg 1330 s t h g kg/m 125 i e W m3/h 7 17 kg/m 12 20 Speed rpm
150
H 500
“L” coordinates indicate a motor size 30 kW. From the table below the gear speed is found to be 90 rpm, and the weight 5950 + (220 x 50) + (190 x 50) = 26,450 kg.
H 630
H 800 H 1000 H 1250 H 1600 Double casing
250 500 600 900 355 400 710 750 1330 200 390 700 600 560 1000 630
400 500 630 800 1000 660 670 800 1000 1250 750 800 900 1000 1250 1060 1180 1350 1450 1700 450 500 560 630 170 560 630 800 1000 1250 800 850 900 1000 1180 950 1060 1200 1300 1600 1600 1600 1800 2000 2500 315 400 500 500 630 490 550 640 760 900 880 990 1200 1400 1650 700 800 900 1100 1200 715 760 925 1045 1170 1400 1600 1800 2000 2500 800 900 1200 1450 1700 top part, bottom part, and chain drive
1250 1600 1320 1900 800 1600 1450 1750 2650 800 1065 1960 1200 1385 2500 2000
1600 2000 1500 2150 900 2000 1750 2000 3000 1000 1300 2380 1450 1690 2850 2400
2070
3060
12570
15250
19680
175
190
340
410
480
16 35
33 51
150
3900
5950 Casing
“L” coordinates indicate a motor size 90 kV\i From the table below the gear speed is found t( be 71 rpm, and the weight 12,570 + (340 x 40) 4 (328 x 40) = 39,290 kg.
8280
200 220 270 Chains and buckets
33 72 47 100 80 150 135 205 240 310 355 450 500 650 59 90 83 128 136 190 202 257 287 328 380 441 409 487 Required speed of output shaft of gear unit 145 100 90 85 71 71 60
Data in this brochure is only intended for preliminary project planning. Manufacturer reserves the right to modify equipment details andlor specifications without notice. DENMARK: F. L.Smidth & Co. A/S, Vigersleu Allé 77, DK-2500 Valby Copenhagen • BRAZIL: F. L.Smidth S.A., Comércio e Indústrie. Rua Nebraska. 443. Broo klin Paullsta - CEP 04560, Caixa Postal 3506 01000 Sao Paulo - SP • CANADA: F. L.Smidth & Co. of Canada, Lt.. 2000, Rue Mansfield. Suite 800, Montreal. Quebec, Canada H3A 2Z5 • FEDERAL REPUBLIC OF GERMANY: F. L.Smidth & Co. GmbH QeninerStrasse133-135,Postfach 1632,0-2400 Lübeckt -FRANCE: F.L.Smidth & Cie-France,S.A.R.L.,55,Rue Ampére, F-75017 Paris. HONG KONG: Representative Office of F.L.Smidth & Co.A/S,25 Floor Hop Hing Centre, 8-12 Hennessy Road, Wanchal • ITALY: F.L.Smidth & C. Italiana S.r.l., Via Aterno, 26,1-66020 S. Qiovanni Teatino (CH) • JAPAN: F.L.Smidth & Co. (Japan) Ltd., Togekl Building, 1-1 Tsukljl 4-chome, Chu o-ku, Tokyo 104, Postal address: Kyobashi P.O.Box 78, Tokyo 104-91 • MEXICO: F.L.Smidth & Cia., S.A. de C.V, Aye. Campos Eliseos, 385,5° piso, Torre B, Chapultepec Polanco 11550 Mexico Ci ty, D.F. • PR OF CHINA: F. L.Smidth & Co. A/S, Belling Representative Office, Noble Tower, Room 1307,22 Jianguo Men Wai, Dajie, Beljing • SOUTH AFRICA: F. L.Smidth &Co. (S.A.) ( Pty.) Ltd. 2nd Floor, Sonsono Building, 344 Pretoria Avenue, Ferndale 2194, Randburg, Johannesburg. Postal address: P.O. Box 3881,2125 Randburg SPAIN: F.L.Smidth & Cla Española, S.A., Avda. General Peron, 38,17° E-28020 Madrid • TURKEY: Representative Office of F. L.Smidth & Co. A/S. c/o Traktor ve Makine Ticaret A.S., Kalender Sk.Alp Han No. 3, Kerostecller Sitesi, P.K. 19, Merter, 34010 Istanbul UNITED KINGDOM: F.L.Smidth & Co. Ltd., 17, Lansdowne Road, Croydon, CR9 2JT • USA: F.L.Smidth & Co., 300 Knickerbocker Road, Cresskill, N.J. 07626 • AUSTRALIA: ANI-RuwoK, Grinding Calcining Group, Selby Anax Building, 368. Ferntree Gully Road. Notting Hill, Victoria 3168 • INDIA: Larsen & Toubro Ltd., Cement Machinery Division, Powal Works. P.O. Box 8901, Bombay 400072
