MT/T 914-2019Textile fire resistant conveyor belting for coalmine (English PDF)

4.1 Product classification

The textile fire retardant conveyor belt for coal mines is divided into. solid woven fire retardant conveyor belt for coal mines, textile laminated fire retardant conveyor belt for coal mines, aramid textile fire retardant conveyor belt for coal mines, according to the textile tensile strength characteristics.

4.2 Model

4.2.1 Solid belt model

The solid belt product model is divided into 680S, 800S, 1000S, 1250S, 1400S, 1600S,

1800S, 2000S, 2240S, 2500S, 2800S, 3100S, 3400S according to the overall longitudinal tensile strength of the solid belt.

4.2.2 Laminated belt model

The laminated belt product model is divided into 680S F, 800S F, 1000S F, 1250S F,

1400S F, 1600S F, 1800S F, 2000S F, 2240S F, 2500S F, 2800S F, 3150S F, 3400S F according to the longitudinal tensile strength.

4.3 Specifications

4.3.1 Width

See Table 1 for the width of the fire retardant belt.

4.3.2 Length

The length of a single roll of fire retardant belt can be agreed upon by both the supplier and the buyer; its limit deviation is ±5%; the limit deviation of the total length of the belt is -0.5% ~ +2.0%.

5.1 Appearance quality

The surface of the solid belt shall be flat, without obvious scars, lack of glue, cracks that affect the use requirements. The fabric core shall be closed.

5.2 Width limit deviation

The width limit deviation of the fire retardant belt shall comply with the provisions of

Table 2.

5.5 Tensile strength

5.5.1 The full-thickness tensile strength of the solid belt shall comply with the provisions of Table 4.

5.5.2 The full-thickness tensile strength of the laminated belt shall comply with the provisions of Table 5.

5.6 Elongation at break

The full-thickness longitudinal elongation at break of the solid belt shall not be less than 15%; the full-thickness transverse elongation at break shall not be less than 18%.

The full-thickness longitudinal elongation at break of the laminated belt shall not be less than 10%.

5.13 Flame retardancy

5.13.1 Roller friction performance

When the fire retardant belt is subjected to the roller friction test, no part of it shall have flaming or flameless combustion; the roller surface temperature shall not be greater than

325 °C.

5.13.2 Blowtorch combustion performance

The fire retardant belt shall meet the following requirements after the blowtorch combustion test.

5.14 Joint strength

5.14.1 Classification

The joint strength of fire retardant belts is divided into mechanical joint strength and adhesive joint strength, according to the joint method. The solid belt and laminated belt can be selected for assessment. Aramid belts are assessed by adhesive joints.

5.14.2 Mechanical joint strength

5.16 Fabric joints

5.16.1 Fabric joints of solid belt and aramid belt

The core of solid belt and aramid belt shall not have transverse and longitudinal joints.

Solid belt supplied in rolls shall not have spliced joints.

5.16.2 Fabric joints of laminated belt

Fabric joints of laminated belt shall comply with the provisions of GB/T 7984.

6.1 Sample collection method

Take samples 24 hours after the fire retardant belt is made.

6.2 Appearance quality inspection

Visual inspection.

6.3 Width test

Use a steel ruler or belt measure with a minimum division value of 1 mm for measurement; measure the dimensions of 3 positions at both ends and the middle of the belt, take the median value as the measurement result.

6.9 Tear force test

The tear force determination method of the solid belt shall be carried out in accordance with the provisions of Appendix B.

6.10 Adhesion strength test

The adhesion strength determination of the solid belt shall be carried out in accordance with the provisions of Appendix C. The adhesion strength test of the laminated belt and aramid belt shall be carried out in accordance with the provisions of Method A of GB/T

6759-2013.

6.11 Physical and mechanical properties test of the covering layer

6.16 Joint strength test

The mechanical joint strength of fire retardant belt shall be carried out in accordance with the provisions of GB/T 12736.The mechanical joint test shall use mechanical buckles that meet the MT/T 319 standard or buckles with higher performance. The buckles shall be bound neatly and there shall be no obvious deformation during the test.

Otherwise, a more suitable mechanical buckle shall be selected; the strength of fire retardant belt's adhesive joints shall be carried out in accordance with the provisions of

MT/T 318.

6.17 Joint dynamic durability test

6.17.1 Conventional dynamic durability test

The conventional dynamic durability of mechanical joints shall be carried out in accordance with the provisions of 5.3.1.3 of MT/T 318.1-1997.The conventional dynamic durability test of adhesive joints shall be carried out in accordance with the provisions of MT/T 318.

7.1 Inspection report

The inspection report shall include the following contents.

7.2 Exit-factory inspection

7.2.1 The fire retardant belt shall be inspected by the quality inspection department of the manufacturer. Each 1000 m shall be considered as a batch (less than 1000 m shall also be considered as a batch) and at least one inspection shall be carried out. The belt shall be exit-factory, only after passing the inspection and issuing the certificate of conformity.

7.3 Type inspection

7.3.1 Type inspection shall be carried out in any of the following situations.

7.3.2 Type inspection items are shown in Table 12.

7.3.3 Specimens for type inspection shall be drawn from products that have passed exit- factory inspection, with a sampling base of 100 m and a sample quantity of 12 m.

7.4 Judgment rules

7.4.1 Qualified judgment conditions

Those meeting the following conditions shall be judged as qualified.

Those meeting the following conditions shall be judged as unqualified.

8.1 Marking

The marking of conveyor belts shall be carried out in accordance with the provisions of

GB/T 5752.

8.3 Storage and transportation

The storage and transportation of fire retardant belts shall be carried out in accordance with the provisions of HG/T 3056.

......