Comparison of implementation standards and related parameters of flame-retardant steel cord conveyor belts for coal mines

Produced by our companySteel cord conveyor beltIt has the advantages of high tensile strength, good impact resistance, long life, low elongation in use, good groove formation, and good flexural resistance. It is widely used in coal and mines. Implementation standard of flame-retardant steel cord conveyor belt for coal mine: MT668-2008 MT147.

For the coal industry, a flame-retardant and antistatic steel cord conveyor belt is more practical. This conveyor belt has various properties of ordinary steel cord conveyor belts. At the same time, compared with ordinary steel cord conveyor belts, it has increased tear resistance and special coal mine work Flame retardant and antistatic performance in the environment, and the products produced meet the requirements of coal mine safety production.

Overlay performance

The performance of the covering layer shall meet the following requirements:

Tensile strength≥15Mpa

Elongation at break ≥350%

After aging test (70℃×168h), the change rate of tensile strength is -25%～+25%, and the change rate of elongation at break is -25%～+25%

The amount of wear shall not be greater than 200mm³

Hardness is 70±5 SH°A

Roller friction test:

When each test piece is subjected to the roller friction test, no burning or flameless combustion occurs in any part of it, and the temperature of the surface of the roller cannot be greater than 325 degrees Celsius.

In the alcohol burner burning test, when the test piece passes the alcohol burner burning test, the following requirements should be met:

1: In the course of the experiment, perform experiments on 6 specimens with a complete covering layer. After removing the blowtorch, the arithmetic averages of the flame combustion specimens and the flameless combustion specimens of all specimens are both It cannot be longer than 3 seconds. The single value of flame burning and flameless burning time of each piece should not be greater than 10 seconds.

2: During the experiment, perform the experiment on 6 specimens with the coating layer removed. After the blowtorch is removed, the arithmetic mean of the flame burning time of all specimens and the flameless combustion specimens cannot be greater than 5 seconds Time, the single value of the flame burning test piece and the flameless burning time of each piece should not be greater than 15 seconds.

Surface resistance value: The arithmetic average of the surface resistance of the upper and lower surfaces of the test piece shall not be greater than 3×108 Ω.