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Technical Data
 
STEELCO BELT CROSS SECTION
 
 
S1=Total Belt Thickness d=Cord Diameter, B= Belt Width
S2 =Top Cover Thickness , t=Pitch , od=S6=S1-S2-S3
S3=Bottom Cover Thickness, bk=Edge Rubber  
 
The preferred belt types are given in the table no-1. There are three groups in the types and these are Low, Medium and High.
 
STEEL CORD
 
STEELCO belts are reinforced with high quality Carbon Steel Cord of 7x7 or 7x19 construction. 7x7 denotes, 7 strands in a cord and each strand contains 7 nos. of filaments. The constructional diagram are given below.
 
 
TABLE NO-1
STANDARD BELT TYPE-KN/M
 
LOW ST-500 ST-630 ST-800 ST-1000 ST-1250 ST-1600
MEDIUM ST-2000 ST-2250 ST-2500 ST-2800 ST-3150  
HIGH ST-3500 ST-4000 ST-4500 ST-5000 ST-5400  
 
TABLE NO-2
STANDARD BELT WIDTH-B
WIDTH-mm 500 650 800 1200 1400 1600 1800 2000 2200 2400
TOLERANCE-mm +10 +10 +10 +10 +12 +12 +14 +14 +15 +15
- 5 -7 1000 ST-5000          
 
 
TABLE NO-3
STANDARD RANGE OF STEELCO BELT
 
Typest
Rating
STD
CORD
DIYA
CORD
CONS
BELT
STD
COVER
THICK
MM
STD
BELT
THICK
MM
STD
BELT
THICK
MM
BREAKING
STRENGTH
WORKING
TENSION
RECOME PULLY DIAMETTER
                A B C
500 3.7 7x7 5.0 5.0 13.9 500 72 630 500 400
3.7 3.7 7x7 5.0 5.0 13.9 630 90 630 500 400
800 3.7 7x7 5.0 5.0 13.9 800 114 630 500 400
1000 3.9 7x7 5.0 5.0 14.1 1000 143 800 630 500
1250 4.7 7x7 5.0 5.0 14.9 1250 179 800 630 500
1400 4.7 7x7 5.0 5.0 14.9 1400 179 800 630 500
1600 5.4 7x7 6.0 6.0 17.6 1600 229 1000 800 630
1800 5.4 7x7 6.0 6.0 17.6 1800 257 1000 800 630
2000 5.4 7x7 6.0 6.0 17.6 2000 286 1000 800 630
2250 6.2 7x19 6.0 6.0 18.4 2250 322 1250 1000 800
2500 6.8 7x19 7.0 7.0 20.6 2500 357 1250 1000 800
2800 7.2 7x19 7.0 7.0 21.0 2800 400 1400 1000 800
3150 8.1 7x19 7.0 7.0 22.1 3150 450 1600 1250 1000
3500 8.6 7x19 7.0 7.0 22.6 3500 500 1600 1250 1000
4000 8.9 7x19 8.0 8.0 24.9 4000 572 1600 1250 1000
4500 9.7 7x19 8.0 8.0 25.7 4500 643 1800 1600 1000
5000 10.9 7x19 10.0 10.0 30.9 5000 714 2000 1800 1000
5400 11.3 7x19 10.0 10.0 31.3 5400 771 2000 1800 1000
                     
 
TABLE NO-4
RECOMMENDED TOP COVER THICKNESS AND STANDARD BELT WEIGHT
       
STD.BELT WEIGHT KG/M2 RECOMMENDED LOW ABRA TOP COVER MED. ABRA THICKNESS HIGHLY ABRA
       
17.67 5.0 7.0 9.0
18.08 5.0 7.0 9.0
18.78 5.0 7.0 9.0
19.71 5.0 8.0 9.0
21.49 5.0 8.0 9.0
22.10 5.0 8.0 9.0
26.27 6.0 8.0 9.0
27.00 6.0 8.0 9.0
27.88 6.0 8.0 9.0
29.90 6.0 8.0 9.0
34.14 7.0 9.0 10.0
35.39 7.0 9.0 10.0
38.00 7.0 9.0 10.0
40.65 7.0 9.0 10.0
45.00 8.0 10.0 12.0
48.67 8.0 10.0 12.0
56.40 1.0 10.0 12.0
58.58 10.0 10.0 12.0
       
       
LOW ABRASIVE MATERIALS
Aluminum Hydrate, Asphalt, Brick, Carbon Black, Coal-bituminus, Copper Sulphate, Cotton Seeds, Gravel-pebbles, Iron Oxide, Lignite-air dried, Lime, Magnesium Salts, Phosphate for fertilizer, Potash Ore, Sand, Saw Dust, Sulphur Lump, Wood Chips,
 
MEDIUM ABRASIVE MATERIALS
Ammonium Salt, Asbestos, Ashes-coal,Bauxite-ground,Bentonite, Cement, Charcoal, Coal-anthracites, Coal-bituminus sizes, Coal-lignite, Coke, Concrete, Feldspar, Gypsum-dust, Iron ore, Lead-ore, Lime stone crushed, Phosohate rock, Pyrites, Rocks crushed, Salt cake, Soda ash, Zinc ores crushed.
 
HIGHLY ABRASIVE MATERIALSs
Alumina, Bauxite- run of mines, Carborundum, Chrome ores, Cinders- blast furnace, Coke loose, Concrete, Copper ores, Foundry refuse, Glass, Granites, Gravel-bank run , Iron ores pallets, Manganese ores, Pyrites pallets, Quartz, Sand bank-dry, Sand stone broken, Sinters, Slag-blast furnace, Steel trimmings, Titanium ore.
 
TABLE NO-5
STANDARD COVER GRADE
NRC STEELCO Beltings are supplied with Indian as well as DIN standard to meet the various demand for selective grades to suit the exact customer's requirements.
 
COVER GRADE TENSILE STRENGTH ELONGATION AT BREAK ABRASION LOSS
  Mpa min % mm3 max
M/H/X 24 450 120
N 17 400 150
D/W 18 400 100
Y 20 400 150
K 15 400 200
 
STEELCO Beltings are also supplied with Heat Resistant, Super Hear Resistant, Oil Resistant covers. The cover grade K denotes Fire Resistant grade.
 
TABLE NO-6
TROUGHABILITY
STEELCO Beltings are flexible enough to get easily troughed between troughing idlers because Its reinforcement with superior quality steel cord.

The troughability is characterized by the ratio of the deflection F to the width B as shown in the figure.
 
 
TROUGHING ANGLE F/B TROUGHING ANGLE F/B
 
20 0.08 450 0.18
25 0.10 400 0.20
30 0.12 400 0.23
35 0.14 400 0.26
40 0.16 400
 
TRANSITION DISTANCE
The Transition Distance is the length of the section of belt between head or tail pulley and the first idler. In some cases, intermediate idlers are placed along the transition distance to make easier passage of the belt from the flat to trough shape. The transition distance depends on the percentage of the rated tension of the belt in operation and the troughing angle of the idlers. It also depends on the head/tail pulley position with respect to belt center line. The Transition Distance value can be obtained for the following table.
 
TABLE NO-7
VALUES OF TRANSITION DISTANCE(MIN)
 
PERCENTAGE OF RATED TENSION CASE1 PULLY & BELT CENTER CASE2 PULLY IS AT THE MIDDLE
  LINE ARE SAME POINT OF THE TROUGHING
    20 30 35 45 20 30 35 45
    2.32XB 3.41XB 3.9XB 4.51XB 1.17XB 1.7XB 1.95XB 2.41XB
    1.90XB 2.80XB 3.2XB 3.7XB 1.00XB 1.4XB 1.60XB 1.98XB
B=Belt Width                  
 
BELT ELONGATION
The steel cord belt has low operational elongation due to reinforcement by high quality steel cord. Normally it has about 0.25% of elastic elongation and about 0.10 % of permanent elongation. Due to this inherent property of the steel cord belt, the Take-Up travel of the belt can be reduced and a smaller takes-up system can be installed compared to the conventional system. The Take-Up travel can be calculated from the following formula:
 
Minimum Take-Up Travel= 0.35xL, where L is the Center- Center distance of the conveyor in mtr. 100