Fire Resistant Steel Cord Conveyor Belt for Coal Mine

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

Before-   aging, ≥

60

70

80

95

105

105

130

135

140

145

150

165

175

180

After-   aging, ≥

55

65

75

90

95

95

120

125

130

140

145

160

170

175

Min.   tensile strength (N/mm)

630

800

1000

1250

1600

2000

2500

2800

3150

3500

4000

4500

5000

5400

Max.   diameter of steel cord (mm)

3.0

3.5

4.0

4.5

5.0

6.0

7.2

7.6

8.1

8.6

8.9

9.7

10.9

11.3

Steel   cord pitch (mm) (±1.5)

10.0

10.0

12.0

12.0

12.0

12.0

15.0

15

15.0

15.0

15.0

16.0

16.0

17.0

Top   cover thickness (mm)

5.0

5.0

6.0

6.0

6.0

8.0

8.0

8.0

8.0

8.0

8.0

8.0

8.5

9.0

Bottom   cover thickness (mm)

5.0

5.0

6.0

6.0

6.0

6.0

6.0

6.0

8.0

8.0

8.0

8.0

8.5

9.0

Belt   width

Number   of steel cord

800

75

75

63

63

63

63

50

50

50

50

50

46

46

43

1000

95

95

79

79

79

79

64

64

64

64

64

59

59

55

1200

113

113

94

94

94

94

76

76

76

76

76

71

71

66

1400

133

133

111

111

111

111

89

89

89

89

89

84

84

78

1600

151

151

126

126

126

126

101

101

101

101

101

96

96

90

1800

171

171

143

143

143

143

114

114

114

114

114

109

109

102

2000

191

191

159

159

159

159

128

128

128

128

128

121

121

113

2200

211

211

176

176

176

176

141

141

141

141

141

134

134

125

Alcohol   burner test

Average 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 9 samples without covers, not more than 5s,   any single value not more than 15s.

Anti-static test

Surface   resistance ≤ 3×10⁸Ω

Drum   friction test

no   flame reappear, ≤ 325℃

Tunnel   propane burning test

a. Undamaged sample length ≥600mm, or

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