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Fire Resistant Steel Cord Conveyor Belt for Coal Mine

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Description

1. Applications

Fire resistant steel cord conveyor belt is suitable for transporting flammable and explosive materials in underground coal mines. It should meet requirements of electrical and fire safety properties.


2. Physical Properties of Rubber Cover

ItemIndex
Tensile Strength/Mpa ≥15
Breaking Elongation/% ≥350
Abrasion Loss/mm3 200
After aging test(70℃×168h)Change rate of tensile strength/%±25
Change rate of breaking elongation/%±25


3. Adhesion

a. Adhesion between rubber cover and belt core: ≥10N/mm.

b. Adhesion of steel core (N/mm)

Belt type630800100012501600200025002800315035004000450050005400
Before- aging, ≥6775829097112130134143151155168186192
After- aging, ≥5069778490105122124135140144157175180


4. Specification

Specification of steel cord conveyor belt

Belt typeST/S630ST/S800ST/S1000ST/S1250ST/S1600ST/S2000ST/S2500ST/S2800ST/S3150ST/S3500ST/S4000ST/S4500ST/S5000ST/S5400
Min. tensile strength (N/mm)630800100012501600200025002800315035004000450050005400
Max. diameter of steel cord (mm)3.03.54.04.55.06.07.27.58.18.68.99.710.911.3
Min. Top/Bottom cover thickness (mm)5.05.06.06.06.08.08.08.08.08.08.08.08.59.0
Belt widthNumber of steel cord
80075756363636350505050



10009595797979796464646464595555
1200113113949494947676767777716666
14001331331111111111118989899090847878
1600151151126126126126101101101104104969090
1800171171143143143143114114114117117109102102
2000196196159159159159128128128130130121113113
2200216216176176176176141141141144144134125125


5. Safety property

ItemFire resistant properties
Alcohol burner testAverage value of flame duration of 6 samples with covers, not more than 3s, any single value not more than 10s.Average value of flame duration of 6 samples without covers, not more than 5s, any single value not more than 15s.
Anti-static testSurface resistance ≤ 3×108Ω
Drum friction testno flame reappear, ≤ 325℃
Tunnel propane burning test

a. Undamaged sample length ≥600mm, or

b. Undamaged sample length ≥50mm, ≤140℃ rising, damaged length≤1250mm


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