This standard specifies the alcohol torch combustion test method for conveyor belts and the corresponding flame retardancy specification. The test method specified in this standard is a small-scale test method under laboratory conditions, and its test results may not be correlated with the ignition or flame self-propagation under other different conditions. This standard is mainly applicable to various types of flame retardant conveyor belts. GB/T 3685-1996 Alcohol torch combustion performance specification and test method for conveyor belts GB/T3685-1996 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Conveyor belts-Flame retardation-Specifications and test method
Conveyor belts-Flame retardation-Specifications and test methodGB/T 3685—1996
Replaces GB3685--83
Method A of this standard is equivalent to the international standard ISO340:1988 "Conveyor belts flame retardation specifications and test methods". 1 Subject content and scope of application
This standard specifies the conveyor belt alcohol torch combustion test method and the corresponding flame retardancy specification. The test method specified in this standard is a small-scale test method under laboratory conditions, and its test results may not be correlated with the ignition or flame self-propagation under other different conditions. This standard is mainly applicable to various types of flame-retardant conveyor belts. 2 Reference standards
Terms for rubber flame test
GB/T 9886
3 Terms
Terms used in this standard are as given in GB/T9886.4 Flame retardancy specification
4.1.1 Flame duration (after removing the blowtorch) The sum of the measured values ​​of each group (6) of samples shall not exceed 45s, and any single value shall not exceed 15s. 4.1.2 Non-reignition
No reignition after ventilation (blowing with air flow at a speed of 1.5m/s for more than 20s). 4.2 Method B
4.2.1 Full thickness test specimens
The average value of the total duration of the open flame and burning of each group (6) of samples shall not exceed 3s; any single value shall not exceed 10s. 4.2.2 Test specimens without covering layer
Instructions for use:
1) ISO does not have this content.
Approved by the State Administration of Technical Supervision on June 12, 1996, 16
Implemented on November 1, 1996bZxz.net
GB/T 3685-1996
The average value of the total duration of open flame and burning of each group (9) of longitudinal specimens or each group (9) of transverse specimens shall not exceed 5s; any single value shall not exceed 15s.
5 Test method
5.1 Principle of the method
Within the specified time, burn the specimen under the specified conditions with the flame of an alcohol torch at a certain temperature, then remove the torch and measure the time the specimen continues to burn. After the specimen leaves the flame, ventilate or not ventilate the extinguished specimen to observe whether it re-ignites. 5.2 Specimens
5.2.1 Number of specimens
5.2.1.1 Method A
a. 6 full-thickness specimens (3 longitudinal and 3 transverse); b. 6 specimens without covering layer (3 longitudinal and 3 transverse). 5.2.1.2 Method B
a. 6 full thickness specimens;
b. 9 longitudinal specimens and 9 transverse specimens without covering layer. 5.2.2 Specimen size and surface requirements
5.2.2.1 Method A
The specimen is a rectangle with a length of 200mm and a width of 25mm. Each cut surface should be smooth, without loose fibers and excess rubber. The specimen should not be stained with foreign matter such as oil that affects the combustion effect. 5.2.2.2 Method B
The specimen is a rectangle with a length of 150mm and a width of 25mm. The surface requirements of the specimen are the same as those in 4.2.2.1. 5.2.3 Sample cutting position
The samples of Method A and Method B are spaced apart from each other, and the cutting cannot be carried out continuously". 5.2.4 Processing of samples without covering layer
The sample without covering layer can be prepared by peeling off the covering layer. If it does not work, knife cutting or grinding can be used. When grinding, be careful not to overheat the sample. The sample can be exposed to the extent that the fabric structure is basically exposed without being damaged. 5.3 Alcohol burner
Figure 1 and Appendix B specify the structure and operating conditions of the alcohol burner, fuel, container and fuel hose with a length of 1.5m.
5.4 Environmental conditions
The test should be carried out in a windproof space or a combustion box. The structure of the combustion box is shown in Figure 2a. It is equipped with a device that can move the burner and the sample holder (Figure 2b).
Instructions for use:
1) ISO and BS do not have this content.
2) ISO No such content.
[0千8°0图—
GB/T 3685—1996
150 ventilating hole
610 (inner edge size)
If necessary, a frame can be made of 30±5
angle iron.
All parts of the top, side and bottom of the box
are made of 6±1 hard
asbestos board or 1.5±1
metal plate.
This observation box is made of steel glass
with a thickness of about
5mm.
Four screws
GB/T 3685—1996
There are 40 mm on both sides of the box. Hole
600×600 Guantai window
Combustion box
Rotatable pillar
b Sample holder
Sample box
Figure 2 Combustion box and sample holder
The door should cover the combustion box window
and can slide up and down smoothly
Combustion box surface diagram
Dimension unit: mm
Unmarked limit deviation is 2 %
Test piece placement position
Blowtorch moving direction
Dimension unit: mm
5.5 Fuel
GB/T3685—1996
The fuel should be a mixture of 5% (V/V) methanol and 95% (V/V) ethanol. 5.6 Sample placement
5.6.1 Method A
When the sample is placed vertically (the main axis of the test piece is perpendicular to the horizontal plane), the test piece The bottom edge of the sample should be 50 mm away from the top of the blowtorch. The blowtorch should be placed at an angle of 45°, and the vertical plane where the axis of the flame tube is located should coincide with the neutral layer plane of the test piece, as shown in Figure 38. b. When the sample is placed at an angle of 45°, the blowtorch should be placed vertically, and the positions of the sample and the blowtorch are shown in Figure 3b. 5.6.2 Method B
The sample is placed horizontally, the blowtorch is placed vertically, and the bottom edge of the sample should be 50 mm away from the top of the blowtorch, as shown in Figure 4. Units in the figure: mm. 5.7 Test procedure
5.7.1 First, check whether the fuel supply system has any leakage and whether the burner is burning normally according to the requirements of Appendix B. 5.7.2 Clamp the sample on the bracket according to Figure 3 or Figure 4 and light the alcohol blowtorch. 5.7.3 Burning Specimen
5.7.3.1 Method A
After the specimen is burned in the flame for 45 seconds, the blowtorch is removed. At the same time, a stopwatch with a minimum scale of 0.1s is used to measure the duration of the flame on the specimen after the blowtorch is removed from the specimen.
After the blowtorch is removed for 60 seconds, blow air at a wind speed of 1.5m/s for 20 seconds to observe whether it reignites. 5.7.3.2 Method B
After the specimen is burned in the flame for 30 seconds, the blowtorch is removed. The total duration of the open flame and burning on the specimen after the blowtorch is removed is measured using the same stopwatch as in 5.7.3.1.
5.7.4 During the burning process, the distance between the specimen and the blowtorch shall always comply with the requirements of Figure 3 or Figure 4. If abnormal changes such as bending of the specimen are found, adjustments shall be made in a timely manner. If adjustments cannot be made, the test results shall be invalidated and another specimen shall be taken for test 1. Instructions for use:
1) ISO and BS do not have this article.
Blowing direction
GB/T 3685-1996
Ventilation and dustproof pipe
Fuel container
Measuring tube
Container switch
Width lamp base
Dimension unit: tmm
6 Nesting representation
Ventilation and dustproof buttocks
10mL open measuring tube
6.1 Flame duration (after removing the blowtorch) 6.1.1 A method
GB/T3685—1996
Fuel container
Container switch
Sample slot
Dimension unit: mm
a. b. The sum and maximum single value of flame duration of 6 full-thickness specimens (3 longitudinal and 3 transverse), b. The sum and maximum single value of flame duration of 6 uncovered specimens (3 longitudinal and 3 transverse). 6.1.2 Method B
The average value and maximum single value of total duration of open flame and blazing of 6 full-thickness specimens, the average value and maximum single value of total duration of open flame and blazing of 9 longitudinal uncovered specimens, the average value and maximum single value of total duration of open flame and blazing of 9 transverse uncovered specimens. 6.2 Flame non-reproducibility
Record whether the flame reappears after the sample is blown. 7 Test report
The test report should include the following:
Product name, model and manufacturer name,
GB/T 3685-1996
The method adopted and the way of placing the test piece, the test results,
Abnormal phenomena in the test,
Test date,
Tester.
A1 Subject content and scope of application
GB/T3685-1996
Appendix A
Preparation of wire rope flame retardant conveyor belt test samples
(Supplement)
This appendix specifies the preparation of wire rope flame retardant conveyor belt test samples. A2 Specimen size
Length: 200mm;
Width: twice the spacing between steel wire ropes;
Thickness: full thickness. The edges on both sides should be the middle part of the rubber compound between adjacent steel wire ropes. A2.2 Method B
Length: 150mm;
Width: 25mmOthers are the same as in A2.1. A2.3 Number of specimens
The number of specimens for Method A and Method B are both longitudinal specimens. A2.4 Specimen preparation
When preparing the specimen, cut it longitudinally with a knife, and cut it transversely with a toothless saw. The surface requirements of the specimen are the same as in Article 5.2.2 of this standard. Appendix B
Installation requirements, operation and maintenance methods of alcohol burners (supplement)
B1 Subject content and scope of application
This appendix specifies the operating conditions used to evaluate the flame retardancy of conveyor belts. B2 Equipment requirements
The size of the blowtorch is shown in Figure 1. The nozzle of the blowtorch is drilled with a 0.70mm drill bit to form a hole with a diameter of (0.7±0.02) mm. During use, the flame-spraying tube above the air hole will be corroded into a conical surface. It can still be used as long as its inner diameter and total height remain unchanged. B2.1 Materials of various parts of the blowtorch
The materials of the parts of the blowtorch should meet the following requirements: Flame-spraying tube: brass (grade: CuZn39P63 alloy); a.
Wire mesh: stainless steel mesh size 500gm (30 mesh); b.
c. Base: steel.
B2.2 Joint sealing materials
The sealing materials of the blowtorch joints shall meet the following requirements: a.
Blowtorch base: fully enclosed copper/asbestos sealing ring, outer diameter 22mm, inner diameter 14mm, thickness 3mm; On-off control valve fixing nut: polytetrafluoroethylene tape (PTFE); c. On-off control valve sealing gland: asbestos ring; GB/T3685—1996
d.Nozzle sealing material is located between the nozzle and the top surface of the nozzle seat: the PTFE tape is snatched into a rope and wrapped around the nozzle neck. B2.3Fuel container
The container has a capacity of 1000mL, equipped with a side tube cut-off with a minimum graduation of 0.1mL and a section of transparent PVC hose (see Figure 3, Figure 4).
B3 Operation of the blowtorch
B3.1 Installation
Install the fuel container on the blowtorch and adjust the fuel in the container so that the height difference between the liquid level and the center of the bottom surface of the nozzle lamp base is (760±2) mm. This liquid level height must be maintained during the entire test. B3.2 Ignition of the blowtorch
Close the on-off control valve and open the off-off valve of the fuel container to verify whether the fuel flow is zero. Add fuel to the preheating plate to make the liquid volume reach three-quarters of the total capacity of the preheating plate, and then ignite the fuel. When the fuel in the preheating plate is burned out, immediately open the on-off control valve fully (at least one full turn), ignite the blowtorch at the top of the blowtorch fire tube and allow the flame to stabilize for 10 minutes.
B3.3 Inspection of the burning state of the blowtorch
After the blowtorch flame is stable, close the off-off valve of the fuel container and supply fuel to the blowtorch with a side pipe with a scale. At the same time, use the side pipe to measure the flow rate for at least 1 minute. The flow rate should be (2.55 ± 0.15) mL/min. B4 Blowtorch Failure
B4.1 Leakage
If the fuel flow rate exceeds the above specified value, there is a leak. This fault can occur at any connection between the blowtorch and the fuel supply system.
B4.2 Blockage
When the fuel flow rate is lower than the above specified value, it is caused by solid impurities in the fuel. B5 Troubleshooting
When the blowtorch has the above fault, the fault can be eliminated by replacing the sealing tape, disassembling the blowtorch, cleaning the nozzle, etc. It should be pointed out that when cleaning the nozzle, care should be taken not to expand the nozzle hole. It is strictly forbidden to use a "cleaner" to dredge. There are two correct cleaning methods: a. Use an aerosol container equipped with a capillary (through the small hole) to blow and clean the nozzle. b. Use the tail of the drill bit to dredge the nozzle. To prevent damage to the nozzle outlet, the drill bit should be inserted from the nozzle entrance. 25
Additional Notes:
GB/T3685—1996
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by Qingdao No. 6 Rubber Factory. The main drafters of this standard are Sun Xiumin, Ding Bing and Han Deshen. Method B of this standard is equivalent to the British standard BS3289—90 "Textile Core Conveyor Belt for Underground Use". 2615) mL/min. B4 Blowtorch Failure
B4.1 Leakage
If the fuel flow exceeds the above specified value, there is a leak. This fault may occur at any connection between the blowtorch and the fuel supply system.
B4.2 Blockage
When the fuel flow is lower than the above specified value, it is caused by solid impurities in the fuel. B5 Troubleshooting
When the blowtorch has the above fault, it can be eliminated by replacing the sealing tape, disassembling the blowtorch, cleaning the nozzle, etc. It should be pointed out that when cleaning the nozzle, care should be taken not to expand the nozzle hole. It is strictly forbidden to use a "cleaner" to dredge. There are two correct cleaning methods: a. Use an aerosol container equipped with a capillary (through the small hole) to blow and clean the nozzle. b. Use the tail of the drill bit to dredge the nozzle. To prevent damage to the nozzle outlet, the drill bit should be inserted from the nozzle entrance. 25
Additional Notes:
GB/T3685—1996
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by Qingdao No. 6 Rubber Factory. The main drafters of this standard are Sun Xiumin, Ding Bing and Han Deshen. Method B of this standard is equivalent to the British standard BS3289—90 "Textile Core Conveyor Belt for Underground Use". 2615) mL/min. B4 Blowtorch Failure
B4.1 Leakage
If the fuel flow exceeds the above specified value, there is a leak. This fault may occur at any connection between the blowtorch and the fuel supply system.
B4.2 Blockage
When the fuel flow is lower than the above specified value, it is caused by solid impurities in the fuel. B5 Troubleshooting
When the blowtorch has the above fault, it can be eliminated by replacing the sealing tape, disassembling the blowtorch, cleaning the nozzle, etc. It should be pointed out that when cleaning the nozzle, care should be taken not to expand the nozzle hole. It is strictly forbidden to use a "cleaner" to dredge. There are two correct cleaning methods: a. Use an aerosol container equipped with a capillary (through the small hole) to blow and clean the nozzle. b. Use the tail of the drill bit to dredge the nozzle. To prevent damage to the nozzle outlet, the drill bit should be inserted from the nozzle entrance. 25
Additional Notes:
GB/T3685—1996
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by Qingdao No. 6 Rubber Factory. The main drafters of this standard are Sun Xiumin, Ding Bing and Han Deshen. Method B of this standard is equivalent to the British standard BS3289—90 "Textile Core Conveyor Belt for Underground Use". 26
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