GB 12731-2014 English PDF

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GB 12731-2014: [GB/T 12731-2014] Fire-resistant V-belts
Status: Valid

GB 12731: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 12731-2014	339	Add to Cart	3 days	[GB/T 12731-2014] Fire-resistant V-belts	Valid
GB 12731-2003	359	Add to Cart	3 days	Fire-resistant V-belt	Obsolete
GB 12731-1991	199	Add to Cart	2 days	Fire resistant V-belt	Obsolete

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Basic data

Standard ID: GB 12731-2014 (GB12731-2014)
Description (Translated English): [GB/T 12731-2014] Fire-resistant V-belts
Sector / Industry: National Standard
Classification of Chinese Standard: G42
Classification of International Standard: 21.220.01
Word Count Estimation: 13,173
Date of Issue: 9/3/2014
Date of Implementation: 7/1/2015
Older Standard (superseded by this standard): GB 12731-2003
Quoted Standard: GB 338; GB/T 394.1; GB/T 3686; GB/T 3688; GB/T 10715; GB/T 11544; GB/T 11545; GB/T 13352; GB/T 14562; HG/T 3864; MT 182
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This Standard specifies structure, model and mark retardant V-belt, requirements, test methods, inspection rules, marking, labeling, packaging, transport and storage. This Standard is applicable to mines and other requirements for the V-belt fire-retardan

GB 12731-2014: [GB/T 12731-2014] Fire-resistant V-belts

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Fire-resistant V-belts ICS 21.220.10 G42 National Standards of People's Republic of China Replacing GB 12731-2003 Flame Retardant V-belt Issued on. 2014-09-03 2015-07-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

5.5 This standard security features are mandatory, the rest are recommended. This standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard replaces GB 12731-2003 "fire-retardant V-belts", compared with GB 12731-2003, in addition to editorial changes outside the main technical change Of the following. --- Modify retardant V band structure representation (see 3.1 and version 3.1 of 3.2,2003 and 3.2); --- Increased flame retardancy V-belt model representation (see 4.1); --- Increased flame retardancy V belt fatigue performance requirements and test methods (see 5.4 and 6.3); --- Retardant modified V with antistatic properties representation (see 5.5.2,2003 version 4.4.2); --- Increased performance requirements and test methods for flame retardant automotive V-belts (see Chapters 5 and 6). The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee and the friction belt drive with pulleys Technical Committee (SAC/TC428/SC3) centralized. This standard was drafted. Zhejiang Sanwei Rubber Products Co., Ltd., Ningbo lush Far East Rubber Co., Ltd., Zhejiang Ken Laite drive Industry Co., Ltd. Zhejiang Kaiou belts, Zijingang Belt Co., Ltd., Qingdao City Product Quality Inspection Technology Research Institute. The main drafters. Zhang Fang, Liu Youliang, Sun Guangming, Lujiang Jun, Wang Jinfang, solution Deli, Pang Chang-chih, Wugui Qing. This standard replaces the standards previously issued as follows. --- GB/T 10714-1989; --- GB 12731-1991, GB 12731-2003. Flame Retardant V-belt

1 Scope

This standard specifies the structure, type and marking requirements, test methods, inspection rules retardant V-belt, marking, labeling, packaging, transport and Storage. This standard applies to mines and other requirements of the V-belt fire-retardant and antistatic occasions.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB 338 industrial methylated GB/T 394.1 industrial alcohol Strength and elongation test method GB/T 3686 V belt stretching Strength test method GB/T 3688 V belt cord adhesion GB/T 10715 belt drive V-ribbed belt, the group V-belt and includes a wide V-belt, hexagonal belt, including a single V-belt antistatic belt guide Electrical. Requirements and test methods (GB/T 10715-2002, ISO 1813.1998, MOD) GB/T 11544 Belt drives - V belt and narrow V Size (datum width) (GB/T 11544-2012, ISO 4184. 1992, MOD) GB/T 11545 V belt drive for the automotive industry with a fatigue test (GB/T 11545-2008, ISO 5287.2003, MOD) GB/T 13352 V belt drive for the automotive industry with its pulley size (GB/T 13352-2008, ISO 2790.2004, MOD) GB/T 14562 V belt fatigue test method torque method Strength Test Method interlayer HG/T 3864 V with adhesive MT182 alcohol burner burner structure and the technical requirements

3 Structure

3.1 V with its flame retardant cross-sectional shape into ordinary V-belt, narrow V-belt fire-retardant; structured into edging and trimming of formula V-belt type flame retardant V belt, which, trimming type flame retardant Trimming V-belt is divided into ordinary V-belt, a toothed belt and V bottom trimming retardant plastic flame retardant V belt clip Buce edge. 3.2 V-belt from the flame-retardant cloth, top cloth, rubber roof, rubber buffer, tensile body, the end of plastic cloth, the end of cloth and other components (see Figure 1). a) Hemming retardant V belt b) Trimming retardant V-belt Figure 1 Schematic diagram of the flame retardant V-belt c) the toothed belt trimming retardant V d) primer Buce edge retardant V belt clip Explanation. 1 --- cloth; 2 --- top cloth; 3 --- rubber roof; 4 --- rubber buffer; 5 --- tensile body; 6 --- primer; 7 --- end of plastic cloth; 8 --- base fabric. Figure 1 (cont.)

4 models and markers

4.1 Model V-belt type flame retardant into Z, A, B, C, D, E six kinds of ordinary V belt with teeth fire-retardant to ZX, AX, BX, CX, DX, EX FIG. Retardant narrow V-belt model is divided into SPZ, SPA, SPB, SPC, 9N, 15N, 25N has seven toothed flame narrow V belt XPZ, XPA, XPB, XPC, 9NX, 15NX, 25NX representation. Retardant automotive V belt model is divided into AV10, AV13, AV15, AV17, AV22 five kinds toothed flame automotive V belt AVX10, AVX13, AVX15, AVX17, AVX22 representation. 4.2 mark Mark example retardant V-belt. In line with GB 12731, flame retardant, A-type, the reference flame length 1400mm V-belt for the Cases, be marked as. Example. GB 12731-FR-A1400 Tag of each element have the following meanings. FR --- retardant V-belt sign; A --- model; 1400 --- reference length of 1400mm.

5 Requirements

5.1 Appearance quality Appearance quality flame retardant V-belts shall comply with the requirements of Table 1. Table 1 retardant V with the appearance of quality requirements Type the name of the defect claim Retardant V-belt Hemming retardant V-belt Wrapped with a broken horn Outsourcing cloth on each side with a total length should not exceed the length of 30% (inner wrapper should not have) Drum kits Take sewing cloth disengaged Take the body flattening Cavernous There should be no Burr burr-sided top should not exceed 0.5mm Retardant Trimming V-belt Drum kits With partial cracking Cavernous There should be no Retardant narrow V-belt Retardant edging narrow V-belt Face projections SPZ, 9N type should not have; SPA, SPB, 15N lack this type Trap height should not exceed 0.5mm; SPC, 25N type should Height should not exceed 1mm Wrapped breakage SPZ, 9N type should not have; SPA, SPB, 15N, SPC, 25N Outsourcing should not exceed a total length of cloth worn with a long 25% of the inner wrapper should not have Take sewing cloth disengaged SPZ, 9N type should not have; SPA, SPB, 15N, SPC, 25N This type allows only one defect shall not exceed 30mm long and 3mm wide There should be spongy Burr burr-sided top should not exceed 0.5mm Trimming retardant narrow V-belt Drum kits With partial cracking Asymmetric angle Cavernous There should be no Retardant automotive V belt Burr edging V with the top surface of one side should not exceed 0.5mm burr Drum kits distortion Cracking There should be no Trimming V-belt on both sides and the top surface of the cutting Heavy edge, hierarchical, top cloth seams disengaged Obviously bent cord There should be no 5.2 Dimensions Reference length limit deviations flame retardant narrow V-belt and V-belt, exposing the height of center distance variation, the difference with the group by GB/T 11544 Provisions. Effective length limit deviations retardant automotive V belt, exposing the height of center distance variation according to GB/T 13352 requirements. 5.3 Physical properties Physical properties of flame retardant V-belts shall comply with the provisions of Table 2. Table 2 Physical properties of flame-retardant V-belt Type Model Tensile Strength kN Reference force elongation Cord adhesion strength kN/m Hemming V with a cutting edge V with V-ribbed belt trimming V Between top fabric and glue Adhesive strength kN/m Retardant V-belt Z, ZX 2.0 A, AX 3.0 B, BX 5.0 C, CX 9.0 D, DX 15.0 E, EX 20.0 7.0 5.0 13.0 25.0 17.0 28.0 21.0 28.0 27.0 35.0 31.0 - 31.0 - 2.0 Retardant narrow V-belt SPZ, XPZ 9N, 9NX 2.3 SPA, XPA 3.0 SPB, XPB 15N, 15NX 5.4 SPC, XPC 9.8 25N, 25NX 12.7 4.0 3.0 5.0 4.0 13.0 20.0 17.0 25.0 21.0 28.0 27.0 35.0 31.0 - 2.0 Retardant automotive V belt AV10, AVX10 2.26 4.0 - - - AV13, AVX13 3.14 4.0 - - - AV15, AVX15 3.7 4.0 - - - AV17, AVX17 4.42 6.0 - - - AV22, AVX22 7.06 6.0 - - - 5.4 Fatigue Performance Fatigue life flame retardant narrow V-belt and V-belts shall comply with the requirements of Table 3, the fatigue life of the flame retardant automotive V-belts should be in accordance with Table 4 Provisions. Fatigue life and flame retardant V-belt narrow V belt with flex times said, according to the formula (1). R = N × dd × π × 60 × t Ld (1) Where. R --- flex frequency; N --- average driving wheel speed, in revolutions per minute (r/min); --- dd capstan reference diameter, in millimeters (mm); t --- V belt to stop the trial before the elapsed time, in hours (h); Ld --- V with a reference length, in millimeters (mm). Table 3 fatigue life and flame retardant V-belt narrow V-belt Type Model Fatigue life/time Retardant V-belt Z, ZX 1 × 105 A, AX 3 × 105 B, BX 4 × 105 Retardant narrow V-belt SPZ, XPZ, SPA, XPA, SPB, XPB 1 × 106 Note 1. The flame of ordinary V-belt C, CX, D, DX, E, EX models achieve a standard model in which the same material A or B type of fatigue test results Eligibility requirements, its performance index has reached this standard eligibility requirements, then the earlier batch of products can be regarded as qualified. Note 2. SPC flame narrow V-belt, XPC, 9N, 9NX, 15N, 15NX, 25N, 25NX models of a model in which the same material SPZ, SPA, When the SPB to any one type of fatigue test results meet the standard eligibility requirements, its performance indicators and eligibility requirements of this standard, the same Batch of products can be considered as eligible. Table 4 Fatigue life retardant automotive V belt Type Model Fatigue Life/h Retardant automotive V belt Hemming V belt AV10, AV13, AV15, AV17, AV22 55 Trimming V-belt AV10, AVX10, AV13, AVX13, AV15, AVX15, AV17, AVX17, AV22, AVX22 5.5 Safety Performance 5.5.1 flame retardant Flame retardant performance V-belts shall comply with the provisions of Table 5. Table 5 V flame goes out with a sample of time (in seconds) model An average of 6 samples out time Off time for each sample Flame retardant V-belt narrow V belt with a clear flame retardant automotive V-flame flameless combustion flameless combustion Z, ZX SPZ, XPZ, 9N, 9NX AV10, AVX10 5 5 10 12 A, AX SPA, XPA AV13, AVX13 5 5 10 12 B, BX SPB, XPB, 15N, 15NX AV15, AVX15 AV17, AVX17 C, CX SPC, XPC AV22, AVX22 5 7 10 15 D, DX 25N, 25NX - 5 7 10 15 E, EX - - 5 7 10 15 5.5.2 antistatic properties Antistatic flame retardant is represented by V-belt V-belt resistance measurements. Retardant V with a resistance measurement test every single value shall be Is greater than the value specified in Table 6. Table 6 maximum resistance single V-belt drive surface model Flame retardant V-belt narrow V belt Automotive V belt fire-retardant Maximum resistance value/MΩ Z, ZX - - 4.48 A, AX SPZ, XPZ, 9N, 9NX AV10, AVX10 3.6 - SPA, XPA AV13, AVX13, 2.8 B, BX - AV15, AVX15, AV17, AVX17 2.5 C, CX SPB, XPB, 15N, 15NX AV22, AVX22 2 - SPC, XPC - 1.6 D, DX - - 1.42 E, EX 25N, 25NX - 1.12

6 Test methods

Size 6.1 flame retardant narrow V-belt and V-belt according to the provisions GB/T 11544 is measured, the size of the flame retardant automotive V-belt press The provisions of GB/T 13352 were tested. 6.2 V with the physical properties of the flame retardant according to GB/T 3686, the provisions of GB/T 3688, HG/T 3864 were tested, the reference flame retardant V-belt Force should be in accordance with Table 7. Table 7 retardant V-belt reference force Type Model reference force/kN Retardant V-belt Z, ZX 0.8 A, AX 1.4 B, BX 2.4 C, CX 3.9 D, DX 7.8 E, EX 11.8 Retardant narrow V-belt SPZ, XPZ, 9N, 9NX 0.8 SPA, XPA 1.1 SPB, XPB, 15N, 15NX 2.0 SPC, XPC 3.9 25N, 25NX 5.0 Table 7 (continued) Type Model reference force/kN Retardant automotive V belt AV10, AVX10 0.79 AV13, AVX13 1.48 AV15, AVX15 1.8 AV17, AVX17 2.36 AV22, AVX22 3.93 Fatigue Performance 6.3 retardant ordinary V belt and narrow V-belt according to the provisions GB/T 14562 were tested, the fatigue properties of flame retardant automotive V belt According to the provisions of GB/T 11545 were tested. Flame retardant performance test 6.4 V-belts shall comply with the provisions of Appendix A. 6.5 V-belt fire-retardant anti-static properties in accordance with the provisions of GB/T 10715 were tested.

7 Inspection rules

7.1 Flame Retardant V-belt from the factory quality inspection department inspection, and can only be issued after passing the factory to prove. 7.2 Flame Retardant V-belts should be carried out one by one appearance quality and dimensional inspection. 7.3 Flame Retardant V belt are a group of more than 5000A meters; in each batch of products, the samples were extracted enough physical properties, antistatic And flame retardant performance test, and this test not less than once a month; the same type, the same material flame retardant V belt fatigue life test every half In not less than once. 7.4 If there is a failure in the performance, it should take another double batch of product samples to retest the project failed, as one Results still unsatisfactory, then the product is defective. 8 Marking, labeling, packaging, transportation and storage 8.1 mark Each retardant V belt should be clearly marked, it should include at least the following. a) mark; b) manufacturer's name or trademark; c) the year of manufacture. 8.2 Labeling and Packaging Use appropriate packaging packaging, the label shall include at least the following. a) mark; b) manufacturer's name or trademark; c) the year of manufacture. 8.3 Transportation and storage 8.3.1 retardant V belt in transportation and storage, avoid direct sunlight and rain and snow Baptist leaching, kept clean to prevent acid, alkali, oil and organic solvents, which are Substances harmful to the quality of the contact zone with the storage location should be more than 1m away from the heat source device, the tape can not be stored by excessive bending and extrusion. 8.3.2 Storage warehouse temperature should be maintained at -18 ℃ ~ 30 ℃, relative humidity should not exceed 70%. 8.3.3 during storage should be avoided so that the flame retardant V-belt deformation may be flame retardant V-belts hanging on the crescent-shaped or flat rack placed on the shelf.

Appendix A

(Normative) Retardant performance test method A.1 Principle Flame has a temperature of burning V-belt sample for a time after removal of the flame lights, open flame on the specimen was measured and flameless combustion automatic The time required to turn off. A.2 device Test device includes the following components. a) alcohol burner, should be required to MT182, the fuel from the container with the calibration tube feeding (see Figure A.1). b) holder and holder for holding the specimen as required location. c) the combustion chamber shall be provided with machined hole as a fuel inlet conduit, boxes should be provided with adjustment means to ensure that the specimen At the appropriate location. Box equipped with exhaust fan in the upper part of the hood, but it should not cause the flame to change the premise, otherwise try Close inspection should blower (see Figure A.2). d) Stopwatch, use a minimum scale 0.01s, total range of 30s stopwatch. Millimeters Explanation. 1 --- alcohol container; 2 --- the outer edge of the flame; 3 --- sample; 4 --- alcohol burner; 5 --- transparent plastic tube; 6 --- scale glass. Figure A.1 arrangement blowtorch flame retardancy test and specimen Millimeters Figure A.2 combustion chamber A.3 fuel The fuel mixture of 95% ethanol and 5% methanol (volume fraction), wherein ethanol according to GB/T 394.1 provisions methanol press GB 338 provisions. A.4 Sample On the same sample should be taken to bring V sixth, each length of more than 100mm, the requirements of neat cutting surface, perpendicular to the top surface, and Paul Holding a clean, dry, smooth and free of burrs. Such as a V belt can not take the full six samples, then take two, but it must be noted in the test report. A.5 Test program A.5.1 alcohol burner ignition operation A.5.1.1 first in alcohol burner preheating plate insertion of an appropriate amount of fuel, turn off the burner control valve and open the valve of the container of alcohol. A.5.1.2 confirm the fuel consumption of alcohol in the container is zero (ie, no leakage) after igniting the fuel preheat coil inside, unscrew the burner control valve Up lap, lit torch. Adjust the height of the container of alcohol, until the flame height is 150mm so far. When the air flow around the sample A.5.1.3 test shall be as small as possible, without affecting the flame burning specimen shall prevail. Fuel level height of the container should be kept at a distance bottom alcohol burner (760 ± 20) mm range A.5.1.4 test, see Figure A.1. A.5.1.5 sample located in the center of flame, the outer edge of the leading edge of the flame consistent. A.5.1.6 specimens should be perpendicular to the combustion chamber of the gate, in order to observe the two sides of the specimen. A.5.2 Determination of sample burning and self-extinguishing time A.5.2.1 The test specimen holder in the combustion chamber of the holder, V belt is located on the end surface of the sample cut plumb plane, V with the top surface of the specimen It was plumb direction. Adjust the height of the holder, so that the lower edge of the specimen can be positioned above the mouth of the burner lights 50mm (see Figure A.1). A.5.2.2 The torch moved just below the burning end of the sample, at the same time, start the stopwatch and close the combustion chamber door, quickly removed after 30s blowtorch. A.5.2.3 were recorded away from the flame to light the sample no longer has any visible open flame or flameless combustion time (ie, spontaneous combustion time). A.6 Expression of results Shall be recorded and calculated the following results. a) Each time a sample of an open flame and flameless combustion time of a single value; After b) 6-flame time average samples and 6 samples flameless combustion time average, after taking two decimal places, rounded down to the decimal point A. A.7 Test report The test report shall include the following. a) V-belt test varieties and specifications; b) the test chamber temperature and relative humidity; c) test results; d) date of the test; e) experimenter. ......

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