MT/T 668-2019 PDF English
US$755.00 · In stock · Download in 9 secondsMT/T 668-2019: Steel cord fire resistant conveyor belting for coalmine Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid MT/T 668: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| MT/T 668-2019 | English | 755 |
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Steel cord fire resistant conveyor belting for coalmine
| Valid |
| MT 668-2008 | English | RFQ |
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5 days
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Steel cord fire resistant conveyor belting for coalmine
| Obsolete |
| MT 668-1997 | English | 479 |
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4 days
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(Coal mine fire capstan rope core technical conditions)
| Obsolete |
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MT/T 668-2019: Steel cord 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/MTT668-2019
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 668-2008
Steel cord 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 Product categories, models, specifications... 7
4 Technical requirements... 9
5 Test methods... 16
6 Inspection rules... 20
7 Marking, packaging, storage, transportation... 23
Appendix A (Normative) Method for determination of bonding strength of covering
layer... 24
Appendix B (Normative) Determination method of bonding fatigue resistance of
dynamic steel wire core... 27
Appendix C (Normative) Determination method of rubber permeability... 29
Appendix D (Normative) Method for determination of dynamic durability of wire rope
joints... 31
Appendix E (Normative) Dimensions and technical requirements of fire resistant belt
joints... 36
1 Scope
This standard specifies the product classification, model, specifications, technical
requirements, test methods, inspection rules, marking, packaging, storage,
transportation of steel cord fire resistant conveyor beltings for coal mines (hereinafter
referred to as "fire resistant belts").
This standard applies to steel cord fire resistant conveyor beltings used in coal mines.
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 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 5752 Conveyor belts - Marking
GB/T 5753 Steel cord conveyor belts - Methods for the determination of total
thickness and cover thickness
GB/T 5754.2 Steel cord conveyor belts - Longitudinal traction test - Part 2.
Measurement of tensile strength
GB/T 5755 Steel cord conveyor belts - Cord-to-coating bond test - Initial test and
after thermal treatment
GB/T 7983 Conveyor belts - Transverse flexibility (troughability) - Test method
GB/T 9770-2013 Steel cord conveyor belts for general use
3 Product categories, models, specifications
3.1 Product category
Fire resistant belts can be divided into the following according to structural
characteristics.
3.2 Model
Product models are divided according to longitudinal tensile strength, see Table 4.The
specific models are as follows.
3.3 Specifications
3.3.1 Width
The width of the fire resistant belt is as shown in Table 1.
3.3.2 Length
The exit-factory length of the fire resistant belt shall be determined through negotiation
4 Technical requirements
4.1 Appearance quality
4.1.1 The fire resistant belt shall not have edge waves.
4.1.6 There shall be no exposed steel wire rope on the fire resistant belt.
4.2 Dimensions
4.2.1 Width deviation
The width limit deviation of the fire resistant belt shall comply with the provisions of
Table 1.
4.2.2 Covering layer thickness
The thickness of the covering layer of the fire resistant belt shall comply with the
requirements in Table 2.
4.2.3 Classification and configuration of tear-resistant layers
4.3 Longitudinal tensile strength
The longitudinal tensile strength of the fire resistant belt shall comply with the
requirements in Table 3.
4.4 Adhesion strength
4.4.1 Wire rope's bonding strength
It shall comply with the requirements of Table 4.For wire ropes with special diameters,
the bonding strength before and after aging shall not be less than (15 d + 15) N/mm,
where d is the diameter of the wire rope.
4.4.2 Covering layer's bonding strength
4.4.2.1 The average bonding strength between the covering layer and the adhesive layer
shall not be less than 10 kN/m.
5 Test methods
5.1 Sample collection
Take samples, 24 h after the product is manufactured.
5.2 Appearance quality
Use visual inspection and measuring tools for inspection.
5.3 Dimensional measurements
5.4 Longitudinal tensile strength test
Follow the provisions of GB/T 5754.2.
5.5 Adhesion strength test
5.5.1 The bonding strength of the steel wire rope shall be carried out in accordance with
the provisions of GB/T 5755.The measurement of the total thickness of the belt and the
thickness of the upper and lower covering layers shall be carried out, in accordance
with the provisions of GB/T 5753.The difference between the total thickness of the belt
and the thickness of the upper and lower covering layers is the diameter of steel wire
rope d.
5.7 Covering layer performance test
5.7.1 The tensile properties of the covering layer shall be in accordance with the
provisions of GB/T 528-2008.The specimen shall be cut using a type 2 [narrow parallel
section width (4.0 ± 0.1) mm] dumbbell-shaped cutter.
5.7.2 The aging resistance of the covering layer shall be in accordance with the
provisions of GB/T 3512.
5.12 Tensile strength test of static joint
The number of samples is 3 pieces. The sample size shall meet the requirements of
Figure 4.The width b shall be (250 ± 30) mm. The tensile speed of the holder is (100 ±
10) mm/min. The static joint's tensile strength is calculated according to formula (1).
The result is an average of 3 test results. Please refer to Appendix E, for the joint
dimensions and technical requirements of the sample.
5.16.3 Equipment and test procedures
Follow the provisions of MT/T 914.
5.16.4 Result expression
The following test results shall be recorded and calculated.
5.17 Tunnel propane combustion test method
Follow the provisions of MT/T 914.
6 Inspection rules
6.1 Inspection report
The inspection report shall at least include the following contents.
6.2 Exit-factory inspection
6.2.1 The product shall be inspected by the quality inspection department of the
manufacturer. 1000 m is considered a batch (less than 1000 m is also considered a batch,
in which the post-aging test of the covering layer is conducted once a quarter), which
shall be inspected once. Only after it passes the inspection and the certificate of
conformity is issued can it leave the factory.
6.2.2 See Table 9 for exit-factory inspection items.
6.3 Type inspection
6.3.3 Type inspection items are as shown in Table 9.
6.4 Determination rules
6.4.1 Qualification conditions
Those meeting the following conditions are deemed qualified.
6.4.2 Nonconformance judgment conditions
Those meeting the following conditions will be deemed unqualified.
7 Marking, packaging, storage, transportation
7.1 Marking
The marking of conveyor belts shall be in accordance with the provisions of GB/T 5752.
7.2 Packaging
The fire resistant belt must be rolled and bundled firmly and neatly with a wooden core,
iron core or other material mandrel. Each piece shall be covered by a packaging;
7.3 Storage and transportation
The storage and transportation of fire resistant belts shall be carried out, in accordance
with the provisions of HG/T 3056.
MT/T 668-2019
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 668-2008
Steel cord 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 Product categories, models, specifications... 7
4 Technical requirements... 9
5 Test methods... 16
6 Inspection rules... 20
7 Marking, packaging, storage, transportation... 23
Appendix A (Normative) Method for determination of bonding strength of covering
layer... 24
Appendix B (Normative) Determination method of bonding fatigue resistance of
dynamic steel wire core... 27
Appendix C (Normative) Determination method of rubber permeability... 29
Appendix D (Normative) Method for determination of dynamic durability of wire rope
joints... 31
Appendix E (Normative) Dimensions and technical requirements of fire resistant belt
joints... 36
1 Scope
This standard specifies the product classification, model, specifications, technical
requirements, test methods, inspection rules, marking, packaging, storage,
transportation of steel cord fire resistant conveyor beltings for coal mines (hereinafter
referred to as "fire resistant belts").
This standard applies to steel cord fire resistant conveyor beltings used in coal mines.
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 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 5752 Conveyor belts - Marking
GB/T 5753 Steel cord conveyor belts - Methods for the determination of total
thickness and cover thickness
GB/T 5754.2 Steel cord conveyor belts - Longitudinal traction test - Part 2.
Measurement of tensile strength
GB/T 5755 Steel cord conveyor belts - Cord-to-coating bond test - Initial test and
after thermal treatment
GB/T 7983 Conveyor belts - Transverse flexibility (troughability) - Test method
GB/T 9770-2013 Steel cord conveyor belts for general use
3 Product categories, models, specifications
3.1 Product category
Fire resistant belts can be divided into the following according to structural
characteristics.
3.2 Model
Product models are divided according to longitudinal tensile strength, see Table 4.The
specific models are as follows.
3.3 Specifications
3.3.1 Width
The width of the fire resistant belt is as shown in Table 1.
3.3.2 Length
The exit-factory length of the fire resistant belt shall be determined through negotiation
4 Technical requirements
4.1 Appearance quality
4.1.1 The fire resistant belt shall not have edge waves.
4.1.6 There shall be no exposed steel wire rope on the fire resistant belt.
4.2 Dimensions
4.2.1 Width deviation
The width limit deviation of the fire resistant belt shall comply with the provisions of
Table 1.
4.2.2 Covering layer thickness
The thickness of the covering layer of the fire resistant belt shall comply with the
requirements in Table 2.
4.2.3 Classification and configuration of tear-resistant layers
4.3 Longitudinal tensile strength
The longitudinal tensile strength of the fire resistant belt shall comply with the
requirements in Table 3.
4.4 Adhesion strength
4.4.1 Wire rope's bonding strength
It shall comply with the requirements of Table 4.For wire ropes with special diameters,
the bonding strength before and after aging shall not be less than (15 d + 15) N/mm,
where d is the diameter of the wire rope.
4.4.2 Covering layer's bonding strength
4.4.2.1 The average bonding strength between the covering layer and the adhesive layer
shall not be less than 10 kN/m.
5 Test methods
5.1 Sample collection
Take samples, 24 h after the product is manufactured.
5.2 Appearance quality
Use visual inspection and measuring tools for inspection.
5.3 Dimensional measurements
5.4 Longitudinal tensile strength test
Follow the provisions of GB/T 5754.2.
5.5 Adhesion strength test
5.5.1 The bonding strength of the steel wire rope shall be carried out in accordance with
the provisions of GB/T 5755.The measurement of the total thickness of the belt and the
thickness of the upper and lower covering layers shall be carried out, in accordance
with the provisions of GB/T 5753.The difference between the total thickness of the belt
and the thickness of the upper and lower covering layers is the diameter of steel wire
rope d.
5.7 Covering layer performance test
5.7.1 The tensile properties of the covering layer shall be in accordance with the
provisions of GB/T 528-2008.The specimen shall be cut using a type 2 [narrow parallel
section width (4.0 ± 0.1) mm] dumbbell-shaped cutter.
5.7.2 The aging resistance of the covering layer shall be in accordance with the
provisions of GB/T 3512.
5.12 Tensile strength test of static joint
The number of samples is 3 pieces. The sample size shall meet the requirements of
Figure 4.The width b shall be (250 ± 30) mm. The tensile speed of the holder is (100 ±
10) mm/min. The static joint's tensile strength is calculated according to formula (1).
The result is an average of 3 test results. Please refer to Appendix E, for the joint
dimensions and technical requirements of the sample.
5.16.3 Equipment and test procedures
Follow the provisions of MT/T 914.
5.16.4 Result expression
The following test results shall be recorded and calculated.
5.17 Tunnel propane combustion test method
Follow the provisions of MT/T 914.
6 Inspection rules
6.1 Inspection report
The inspection report shall at least include the following contents.
6.2 Exit-factory inspection
6.2.1 The product shall be inspected by the quality inspection department of the
manufacturer. 1000 m is considered a batch (less than 1000 m is also considered a batch,
in which the post-aging test of the covering layer is conducted once a quarter), which
shall be inspected once. Only after it passes the inspection and the certificate of
conformity is issued can it leave the factory.
6.2.2 See Table 9 for exit-factory inspection items.
6.3 Type inspection
6.3.3 Type inspection items are as shown in Table 9.
6.4 Determination rules
6.4.1 Qualification conditions
Those meeting the following conditions are deemed qualified.
6.4.2 Nonconformance judgment conditions
Those meeting the following conditions will be deemed unqualified.
7 Marking, packaging, storage, transportation
7.1 Marking
The marking of conveyor belts shall be in accordance with the provisions of GB/T 5752.
7.2 Packaging
The fire resistant belt must be rolled and bundled firmly and neatly with a wooden core,
iron core or other material mandrel. Each piece shall be covered by a packaging;
7.3 Storage and transportation
The storage and transportation of fire resistant 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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