MT/T 914-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| MT/T 914-2019 | English | 470 |
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Textile fire resistant conveyor belting for coalmine
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| MT 914-2008 | English | RFQ |
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Solid woven fire resistant conveyor belting for coalmine
| Obsolete |
| MT 914-2002 | English | 999 |
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(Mine whole flame retardant fabric conveyor belt)
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MT/T 914-2019: Textile fire resistant conveyor belting for coalmine---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/MTT914-2019
MT
COAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.99; 53.040.20; 13.220.40
G 42
Replacing MT 914-2008, MT 830-2008
Textile fire resistant conveyor belting for coalmine
Issued on. NOVEMBER 28, 2019
Implemented on. JUNE 01, 2020
Issued by. State Administration of Coal Mine Safety
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Specifications... 8
5 Technical requirements... 10
6 Test methods... 16
7 Inspection rules... 18
8 Marking, packaging, storage, transportation... 21
Appendix A (Normative) Determination method of tensile strength and elongation at
break... 22
Appendix B (Normative) Method for determining the tear force of solid belt... 25
Appendix C (Normative) Method for determining the bonding strength of solid belt 28
Appendix D (Normative) Surface resistance determination method... 31
Appendix E (Normative) Roller friction test method... 34
Appendix F (Normative) Blowtorch combustion test method... 37
Appendix G (Normative) Test method for propane combustion in laneway... 41
1 Scope
This standard specifies the terms and definitions, product classification, models and
specifications, technical requirements, test methods and inspection rules, marking,
packaging, storage, transportation of textile fire resistant conveyor belting for coalmine
(hereinafter referred to as fire retardant belts).
This standard applies to textile fire resistant conveyor belting for coalmine.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 338 Industrial methanol
GB/T 394.1 Ethanol for industrial use
GB/T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile
stress-strain properties
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat
resistance tests - Air-oven method
GB/T 3690 Textile conveyor belts - Full thickness tensile strength, elongation at
break and elongation at the reference load - Test method
GB/T 5752 Conveyor belts - Marking
GB/T 6759-2013 Conveyor belts - Adhesion between constitutive elements - Test
methods
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Fire-resistant properties
The properties of conveyor belts that meet the requirements of 5.13.
3.2
Rated force
The force obtained by multiplying 10% of the overall longitudinal rated tensile
strength of the fire retardant belt by the width of the middle part of the specimen.
3.3
Rubber cover
The covering layer of the fire retardant belt which contains more than 80% of the
rubber content of the rubber and plastic.
3.4
Peak
The position on the curve where the slope changes from positive to negative.
3.5
Whole curve
The curve segment from the first peak to the last peak of the normal tear segment.
The normal tear segment is the rest of the curve excluding the peak increment
segment that may occur at the beginning of the tear.
4 Specifications
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 Technical requirements
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 Test methods
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 Inspection rules
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 Marking, packaging, storage, transportation
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.
MT/T 914-2019
MT
COAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.99; 53.040.20; 13.220.40
G 42
Replacing MT 914-2008, MT 830-2008
Textile fire resistant conveyor belting for coalmine
Issued on. NOVEMBER 28, 2019
Implemented on. JUNE 01, 2020
Issued by. State Administration of Coal Mine Safety
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Specifications... 8
5 Technical requirements... 10
6 Test methods... 16
7 Inspection rules... 18
8 Marking, packaging, storage, transportation... 21
Appendix A (Normative) Determination method of tensile strength and elongation at
break... 22
Appendix B (Normative) Method for determining the tear force of solid belt... 25
Appendix C (Normative) Method for determining the bonding strength of solid belt 28
Appendix D (Normative) Surface resistance determination method... 31
Appendix E (Normative) Roller friction test method... 34
Appendix F (Normative) Blowtorch combustion test method... 37
Appendix G (Normative) Test method for propane combustion in laneway... 41
1 Scope
This standard specifies the terms and definitions, product classification, models and
specifications, technical requirements, test methods and inspection rules, marking,
packaging, storage, transportation of textile fire resistant conveyor belting for coalmine
(hereinafter referred to as fire retardant belts).
This standard applies to textile fire resistant conveyor belting for coalmine.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 338 Industrial methanol
GB/T 394.1 Ethanol for industrial use
GB/T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile
stress-strain properties
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat
resistance tests - Air-oven method
GB/T 3690 Textile conveyor belts - Full thickness tensile strength, elongation at
break and elongation at the reference load - Test method
GB/T 5752 Conveyor belts - Marking
GB/T 6759-2013 Conveyor belts - Adhesion between constitutive elements - Test
methods
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Fire-resistant properties
The properties of conveyor belts that meet the requirements of 5.13.
3.2
Rated force
The force obtained by multiplying 10% of the overall longitudinal rated tensile
strength of the fire retardant belt by the width of the middle part of the specimen.
3.3
Rubber cover
The covering layer of the fire retardant belt which contains more than 80% of the
rubber content of the rubber and plastic.
3.4
Peak
The position on the curve where the slope changes from positive to negative.
3.5
Whole curve
The curve segment from the first peak to the last peak of the normal tear segment.
The normal tear segment is the rest of the curve excluding the peak increment
segment that may occur at the beginning of the tear.
4 Specifications
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 Technical requirements
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 Test methods
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 Inspection rules
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 Marking, packaging, storage, transportation
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.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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