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MT/T 668-2019 PDF English

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MT/T 668-2019: Steel cord fire resistant conveyor belting for coalmine
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Status: Valid

MT/T 668: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
MT/T 668-2019755 Add to Cart Auto, 9 seconds. Steel cord fire resistant conveyor belting for coalmine Valid
MT 668-2008RFQ ASK 5 days Steel cord fire resistant conveyor belting for coalmine Obsolete
MT 668-1997479 Add to Cart 4 days (Coal mine fire capstan rope core technical conditions) Obsolete

Similar standards

GB/T 1171   GB/T 2550   MT/T 914   

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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