Some standard content:
Chemical Industry Standard of the People's Republic of China
Steel Wire Cord Flame-retardant Conveyor Belt
1 Subject Content and Applicable Model
HG2539-93
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of steel wire cord flame-retardant conveyor belts (hereinafter referred to as belts).
This standard applies to steel wire cord conveyor belts used in places that require flame retardancy and static conductivity. 2 Reference standards
GB/T528 Determination of tensile properties of vulcanized rubber and thermoplastic rubberGB/T 3512
GB/T 3684
Test method for hot air aging of rubber
Specifications and test methods for electrical conductivity of conveyor belts
GB/T 3685
Test method for flame resistance of conveyor belts
GB4490 Dimensions of conveyor belts
GB 5752
Marking of conveyor belts
GB/T 5753
Determination of cover thickness of steel cord conveyor beltsGB/T 5754
Determination of longitudinal tensile strength of steel cord conveyor beltsDetermination of bonding strength of steel cords for steel cord conveyor beltsGB/T 5755
GB6757 General rules for storage and handling of conveyor belts
Conveyor belt roller friction test method
GB/T 7986
GB9770 Steel cord conveyor belts
HG/T2410 Conveyor belt sampling
3 Product classification
3.1 Product specifications
Belt specifications are divided according to longitudinal tensile strength and width. 3.1.1 Strength specification
Strength specification of belt is indicated by letter "\ST" and nominal value of longitudinal tensile strength (N/mm), and its series is shown in Table 1. 3.1.2 Width specification
Width specification of belt is indicated by mm, and its series is shown in Table 1. 3.2 Product type
Belt is divided into Type 1 and Type 2 according to physical properties and safety performance. 3.3 Product model
Model of belt is as follows:
Approved by Ministry of Chemical Industry of the People's Republic of China on September 6, 1993 344
Implementation on December 1, 1994
4 Technical requirements
ST 1000
4.1 Structure and size
The structure and size of belt are shown in Figure 1 and Table 1.
HG 2539—93
$4.5-6 X 6
Thickness of upper and lower covering layers (mm)
Diameter of wire rope (mm)
Width specification (mm)
Performance level
Flame-retardant and electrostatically conductive letter code
-Strength specification
b—Width of belt: b1—Center distance between two ends of wire rope; b2-Edge glue width, d—Wire rope diameter, e—Eccentricity of wire rope in thickness direction; -Baseline for eccentricity determination; t—Thickness of belt; t1—Thickness of upper covering layer—Thickness of lower covering layer—Spacing between wire ropes Table 1
Strength specification of belt||tt ||Longitudinal tensile strength, N/mm
Maximum nominal diameter of wire rope, mm
Wire rope spacing, mm
Thickness of upper cover layer of belt, mm
Thickness of lower cover layer of belt, mm
Width specification, mm
ST800ST1000
ST1250|ST1600ST2000ST2500
IST3150
ST4000
4.2 Wire rope configuration and joints
4.2.1 Wire rope configuration
HG 2539—93
The left-hand steel wire rope and the right-hand steel wire rope of the belt core shall be arranged alternately. The rope diameter, rope pitch and number of steel wire ropes shall comply with the provisions of Table 1. 4.2.2 Wire rope joints
Within the manufacturing length of the belt, the joints of the steel wire ropes in the belt core shall comply with the following provisions: 4.2.2.1 There shall be no joints on each of the two side steel wire ropes. 4.2.2.2 The number of steel wire ropes with joints shall not exceed 5% of the total number of joints. There shall be no more than 10 joints on a steel wire rope, and the joints shall be at least 10m away from the belt end. 4. 2. 2. 3
4.2.2.4 The distance between any two steel wire ropes in the length direction shall not be less than 10m. 4.3 Dimensional deviation
4.3.1 The length and width deviation of the belt shall comply with the requirements of GB4490. 4.3.2
The limit deviation of the thickness of the cover layer is 0.5mm
The maximum difference in the thickness of the belt (i.e. the difference between the maximum thickness and the minimum thickness) shall not be greater than 10% of the average thickness. The limit deviation of the average rope pitch is ±3mm, of which 5% of the steel wire ropes are allowed to exceed this limit deviation, but the excess shall not exceed 10% of the average pitch.
4.3.5 The eccentricity of the steel wire rope with a core in the thickness direction shall not be greater than 1.5mm. The number of steel wire ropes with an eccentricity greater than 1.0mm but not greater than 1.5mm shall not exceed 5% of the total number of steel wire ropes. 4.3.6 The width of the edge glue of the belt shall not be less than 10mm. 4.4 Physical properties
4.4.1 The physical properties of the covering layer shall comply with the provisions of Table 2. 4.4.2 According to the strength and width specifications of the belt, the tensile strength of the wire rope shall comply with the values specified in GB9770. Table 2
Tensile strength, MPa
Elongation at break, %
Aging, 70℃×168h
Change of tensile strength, %
Change of elongation at break, %
4.4.3 The bonding strength of the wire rope shall comply with the provisions of Table 3. 4.4.4 The bonding strength of the wire rope after aging shall not be less than 85% of the values specified in Table 3. Table 3
Rope diameter d
3. 1～3. 2
3. 7～3. 8
4.5Safety performance
Adhesion strength, N/mm
Rope diameter d
8. 1~8. 5
9. 6~10. 0
Adhesion strength, N/mm
HG 2539—93
The safety performance items of the belt include static electricity conduction, roller friction, alcohol torch combustion and propane burner combustion. The safety performance requirements shall comply with the provisions of Table 4.
Static conductivity
Roller friction
Alcohol blowtorch combustion
Propane burner combustion
4.6 Appearance quality
Average surface resistance of the upper and lower surfaces of the belt, Q Roller surface temperature, ℃
The sample has no open flame and flameless combustion
Flameless combustion
Average self-extinguishing time of 4 samples, s
Average self-extinguishing time of 4 samples, s
Any single value of self-extinguishing time of any sample, s
Full width unburned length, mm
The appearance quality of the belt shall comply with the requirements of Appendix A of GB9770. 5 Test methods
3×108
5.1 The tensile performance test of the belt cover layer shall be carried out in accordance with GB/T528, and the sample size shall be cut by a type 2 (narrow parallel part width 4.0±0.1mm) sub-bell-shaped cutter
5.2 The longitudinal tensile strength test of the belt shall be carried out in accordance with GB/T5754. 5.3 The bond strength test of the steel wire rope before and after aging shall be carried out in accordance with GB/T5755, and the aging conditions shall be carried out in accordance with Article 3.2.2.2 of the standard.
5.4 The measurement method of the width and length of the belt shall be carried out in accordance with GB4490. 5.5 The maximum difference in the thickness of the belt and the measurement of the thickness of the cover layer shall be carried out in accordance with GB/T5753. 5.6 The measurement of the edge glue width of the flame-retardant steel cord conveyor belt is to measure the distance from the center of the steel wire rope close to the edge glue to the edge of the belt on the cross section of the belt.
The measurement of the pitch of the steel wire rope shall be carried out as follows: 5.7
Measure 10 continuous pitches in the middle and both sides of any cross section of the belt, and calculate the average pitch of each of the three places, and then take the average of these three values as the average pitch of the belt. The number of pitches with a statistical limit deviation exceeding ±3mm, but the excess amount is not greater than 10% of the average pitch, calculate the percentage of this number in the total number of steel wire ropes, and measure it according to the requirements of Article 4.3.4. 5.8 The eccentricity value of the steel wire rope in the thickness direction shall be determined in accordance with Appendix C of GB9770. 5.9 The aging resistance test of the covering layer shall be carried out in accordance with GB/T3512. 5.10 The static electricity conduction test shall be carried out in accordance with GB/T3684. 5.11 The alcohol burner burning test shall be carried out in accordance with GB/T3685. The sample is at a 90° angle to the flame, and the burning time of type 1 belt is 60s and the burning time of type 2 belt is 30s.
5.12 Roller friction test shall be carried out in accordance with GB/T7986. 5.12.1 The roller operates normally, so that the tensioning system applies a tensioning force of 343N to the sample until the test is completed, and the tensioning force is no longer increased. 5.12.2 The test time for type 1 belt is 120min, and the test time for type 2 belt is 60min. 5.13 The propane burner combustion test shall be carried out in accordance with Appendix A. 347
6 Inspection rules
HG2539-93
6.1 The appearance quality, length, width and edge glue width of the belt shall be inspected one by one. 6.2 The sampling of conveyor belts shall be carried out in accordance with HG/T2410. 6.3 The inspection batch for factory inspection shall be carried out in accordance with HG/T2410. The factory inspection items include the physical properties of the cover layer before aging, the tensile strength, bonding strength, spacing of the wire ropes, eccentricity of the wire ropes in the thickness direction, static electricity conduction, alcohol burner combustion and roller friction test. 6.4 Type inspection shall be carried out at least once a year and shall comply with all the items required by this standard. 6.5 After inspection, if one performance does not meet this standard, two more samples should be taken from the same batch of belts for retesting. If one sample still does not meet this standard after the retest, the batch of products shall be unqualified. 7 Marking, packaging, storage and handling
7.1 The marking of belts shall be in accordance with GB5752.
7.2 The belts shall be wound around the wood core or iron core, wrapped firmly with covering materials, and accompanied by a product inspection certificate. 7.3 The storage and handling of belts shall be in accordance with GB6757. 348
A1 Subject content and scope of application
HG2539—93
Appendix A
Conveyor belt propane burner combustion test method (supplement)
This appendix specifies the test method for determining the flame retardancy of conveyor belts using the propane combustion method. A2 Test Device
A2.1 The tunnel
is rectangular, with a cross-sectional size of 2m×2m. It is equipped with an exhaust fan to circulate air in the tunnel and is used to place the test bench. A2.2 Test Bench
As shown in Figure A1, it is a rectangular frame structure made of steel pipes with an outer diameter of 20~25mm. The bench is 2.20m long, 1.25m wide, and the distance from the highest point to the ground is 350mm. There are two angle steels on the upper part of both sides of the bench, and there are several notches on the angle steels. These notches are used to place 15 stainless steel rods with a diameter of 10mm and a length of 1.4mm. The stainless steel rods can rotate freely in the notches. The bench is used to place the sample (see Figure A).
A2.3 Burner
As shown in Figure A2, it is a square frame with a side length of 450mm and a height of 220mm welded from seamless steel pipes with an outer diameter of 20~25mm. There are 52 jet holes with a diameter of 1.5mm±0.1mm on the top of the steel pipe, and the hole spacing is 50mm. A2.4 The fuel
is bottled propane gas with a purity of more than 95%. The propane gas enters the burner through a high-pressure hose with an inner diameter of at least 6mm and a pressure reducing valve. Before and during the test, the propane core should be immersed in water at a temperature of 25℃±3℃, and its immersion height is 2/3 of the height. The propane gas flow can be controlled by a standard orifice plate with a thickness of 1.7mm and an aperture of 2.5mm, installed at the input end of the burner. A high-precision pressure gauge is installed in front of the orifice plate, and a flow meter can also be installed in front of the pressure reducing valve. During the 10-minute test time, the consumption of propane gas should be 1.30kg±0.05kg. At the end of each test, the weight of the remaining propane gas shall not be less than 10% of the weight when it was canned.
A3 Sample preparation
A3.1 Sample
When the thickness of the upper and lower covering layers is the same, the length shall not be less than 4m. When the thickness of the upper and lower covering layers is different, the length shall not be less than 6m. When the longitudinal full-thickness tensile strength is less than or equal to 1250N/mm, the width shall be 800mm; when the longitudinal full-thickness tensile strength is greater than 1250N/mm, the width shall be 1000mm.
A3.2 Sample
Cut a sample with a length of 2000mm±10mm and a width equal to the full width of the strip from the sample. When the thickness of the upper and lower covering layers is the same. 2 samples; when the thickness of the upper and lower covering layers is different, 3 samples.
A4 Test procedure
Before the test, place the sample flat at room temperature above 0℃ for more than 24h to eliminate bending deformation. a.
b. Place the test bench in the center of the laneway and make its longitudinal center line coincide with the center line of the laneway. c. The burner is placed in the center of the tunnel and at the air inlet end of the test bench. Its four parallel steel pipes are parallel to the longitudinal center line of the bench, and the distance from the top surface of the burner to the top surface of the test bench is 130mm ± 5mm. The horizontal jet hole at the front end of the burner is 50mm away from the horizontal edge of the front end of the test bench, as shown in Figure A1.
HG 2539—93
The regulator plate has 1.7mm
diameter 2.5mm
35±
HG 2539—93
450±10
52 holes with a diameter of 1.5±0.1
Figure A2 Propane burner
d. Turn on the exhaust fan to make air flow through the test bench. Adjust the air supply volume so that the wind speed at the air inlet 750mm from the front end of the test bench and 350mm from the ground is 1.5±0.1m/s. e. Place the samples on the test bench one by one and test them. During the test, the longitudinal center line of the sample coincides with the center line of the test bench, and one end of the sample is flush with the front end of the test bench. f. When the thickness of the upper and lower covering layers of the conveyor belt is the same, the upper and lower covering layers are tested downward respectively. When the thickness of the upper and lower covering layers of the conveyor belt is different, first test the upper and lower covering layers downward respectively, and repeat the test once with the third sample on the side with the worse measured value. g. Ignite the burner, turn off the burner after burning for 10 minutes, and remove it from the test bench to prevent melted and charred materials from falling on the burner and blocking the jet hole. When all open flames and flameless combustion disappear, remove the sample and measure the remaining full width length of the sample. h. Notes
If the sample is damaged due to curling toward the burner, the test should be stopped and the sample should be retested. To prevent the sample from curling during the test, it can be easily tied to the test bench with wire, but it should not be tied too tightly to prevent the sample from shrinking slightly during the heating process.
A5 Evaluation of test results
The criteria for evaluating whether it is burnt are:
a. Burnt includes any visible damage, such as brittleness, hardening, cracking, bubbles and other damage that was not originally there. b. Before measurement, the smoke marks and oil stains on the surface of the sample can be wiped off with a dry cloth. The phenomenon of soot, deposition or loss of gloss due to burning on the surface of the belt should not be judged as burnt.
c. Bubbles with a size of no more than 5mm in each direction or other small damages of no more than 5mm are handled as follows: Small damage with no more than 5 burn points is not considered damage. Small damage separated by more than 25mm is also not considered damage. Any more small damages forming a circle with a diameter of no more than 50mm on the surface of the specimen, and the distance between each group is more than 300mm, are not considered damaged.
The remaining full width unburned length of the upper and lower covering layers of the specimen should be as shown in L in Figure A3, and measured with a steel tape along the longitudinal direction of the specimen and the surface of the specimen d.
A6 Test result expression
HG2539—93
○ in the figure indicates bubbles on the surface of the specimen
The center indicates the burned part of the specimen
Figure A3 Specimen damage inspection diagram
The full width unburned length of the upper and lower surfaces of each specimen. The self-extinguishing time of the open flame and flameless combustion of each specimen. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by the Zaozhuang Rubber Factory and Qingdao Rubber Industry Research Institute. The main drafters of this standard are Dai Lixin and Tao Dajun. This standard type 1 refers to the Australian standard AS1333-88 steel cord rubber conveyor belt. 3521 The marking of the belt shall be in accordance with GB5752.
7.2 The belt shall be wound on a wooden core or an iron core, wrapped firmly with a covering, and accompanied by a product inspection certificate. 7.3 The storage and handling of the belt shall be in accordance with GB6757. 348
A1 Subject content and scope of application
HG2539-93
Appendix A
Conveyor belt propane burner combustion test method (supplement)
This appendix specifies the test method for determining the flame retardancy of conveyor belts using the propane combustion method. A2 Test device
A2.1 The tunnel
is rectangular with a cross-sectional size of 2m×2m. An exhaust fan is installed to circulate air in the tunnel and is used to place the test bench. A2.2 Test bench
As shown in Figure A1, it is a rectangular frame structure made of steel pipes with an outer diameter of 20~25mm. The bench is 2.20m long and 1.25m wide, with the highest point 350mm from the ground. There are two angle steels on the upper part of both sides of the bench, with several notches on the angle steels. These notches are used to place 15 stainless steel bars with a diameter of 10mm and a length of 1.4mm. The stainless steel bars can rotate freely in the notches. The bench is used to place the sample (see Figure A).
A2.3 Burner
As shown in Figure A2, a seamless steel pipe with an outer diameter of 20~25mm is welded into a square frame with a side length of 450mm and a height of 220mm. There are 52 jet holes with a diameter of 1.5mm±0.1mm on the top of the steel pipe, with a hole spacing of 50mm. A2.4 Fuel
It is bottled propane gas with a purity of more than 95%. The propane gas enters the burner through a high-pressure hose with an inner diameter of at least 6mm and a pressure reducing valve. Before and during the test, the propane core should be immersed in water at a temperature of 25℃±3℃, and its immersion height is 2/3 of the height. The propane gas flow can be controlled by a standard orifice plate with a thickness of 1.7mm and an aperture of 2.5mm, installed at the burner input end. A high-precision pressure gauge is installed in front of the orifice plate, and a flow meter can also be installed in front of the pressure reducing valve. During the 10min test time, the consumption of propane gas should be 1.30kg±0.05kg. At the end of each test, the weight of the remaining propane gas shall not be less than 10% of the weight when it is filled.
A3 Sample preparation
A3.1 Sample
When the thickness of the upper and lower covering layers is the same, the length shall not be less than 4m. When the thickness of the upper and lower covering layers is different, the length shall not be less than 6m. When the longitudinal full-thickness tensile strength is less than or equal to 1250N/mm, the width is 800mm; when the longitudinal full-thickness tensile strength is greater than 1250N/mm, the width is 1000mm.
A3.2 Test Specimen
Cut a specimen with a length of 2000mm±10mm and a width equal to the full width of the strip from the sample. When the thickness of the upper and lower covering layers is the same, there are 2 specimens; when the thickness of the upper and lower covering layers is different, there are 3 specimens.
A4 Test Procedure
Before the test, place the specimen flat at room temperature above 0℃ for more than 24 hours to eliminate bending deformation. a.
b. Place the test bench in the center of the tunnel and make its longitudinal center line coincide with the center line of the tunnel. c. Place the burner in the center of the tunnel and at the air inlet end of the test bench. Its 4 parallel steel pipes are parallel to the longitudinal center line of the bench, and the distance from the top surface of the burner to the top surface of the test bench is 130mm±5mm. The horizontal jet hole at the front end of the burner is 50mm away from the horizontal edge of the front end of the test bench, as shown in Figure A1.
HG 2539—93
Regulator plate with 1.7mm
diameter 2.5mm
35±
HG 2539—93
450±10
52 holes with a diameter of 1.5±0.1
Figure A2 Propane burner
d. Turn on the exhaust fan to allow air to flow through the test bench. Adjust the air supply so that the wind speed at the center of the test bench, 750mm from the front end of the test bench and 350mm from the ground, is 1.5±0.1m/s. e. Place the samples on the test bench one by one and test them one by one. During the test, the longitudinal center line of the sample coincides with the center line of the test bench, and one end of the sample is flush with the front end of the test bench. f. When the thickness of the upper and lower covering layers of the conveyor belt is the same, the upper and lower covering layers are tested downwards respectively. When the thickness of the upper and lower covering layers of the conveyor belt is different, the upper and lower covering layers shall be tested downwards respectively first, and the side with the worse measured value shall be tested again with the third sample. g. Ignite the burner, turn off the burner after burning for 10 minutes, and remove it from the test bench to prevent the melted and charred materials from falling on the burner and blocking the jet hole. When all the open flames and flameless combustion disappear, remove the sample and measure the remaining full width length of the sample. h. Notes
If the sample is damaged because it curls toward the burner, the test should be stopped and the sample should be re-tested. In order to prevent the sample from curling during the test, it can be easily tied to the test bench with wire, but it should not be tied too tightly to avoid preventing the sample from shrinking slightly during the heating process.
A5 Evaluation of test results
The criteria for evaluating whether it is burnt are:
a. Burnt includes any visible damage, such as brittleness, hardening, cracking, bubbles and other damage that was not originally there. b. Before measurement, the smoke marks and oil stains on the surface of the sample can be wiped off with a dry cloth. The presence of soot, deposition or loss of gloss on the surface of the belt due to burning shall not be considered as burnt.
c. Bubbles with a size of no more than 5mm in each direction or other small damages no more than 5mm are handled as follows: Small damages with no more than 5 burn points are not considered as damage. Small damages separated by more than 25mm are also not considered as damage. Any more small damages forming a circle with a diameter of no more than 50mm on the surface of the sample, and the distance between each group is more than 300mm, are also not considered as damage.
The remaining full width unburned length of the upper and lower covering layers of the sample should be as shown in L in Figure A3, and measured with a steel tape along the longitudinal direction of the sample and the surface of the sample d.
.
A6 Test result expression
HG2539—93
○ in the figure indicates bubbles on the surface of the sample
The center indicates the burned part of the sample
Figure A3 Test piece damage inspection diagram
The unburned length of the full width of the upper and lower surfaces of each sample. The self-extinguishing time of the open flame and flameless combustion of each sample. Additional remarks:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by the Zaozhuang Rubber Factory and Qingdao Rubber Industry Research Institute. The main drafters of this standard are Dai Lixin and Tao Dajun. Type 1 of this standard adopts the Australian standard AS1333—88 Steel Cord Rubber Conveyor Belt. 3521 The marking of the belt shall be in accordance with GB5752.
7.2 The belt shall be wound on a wooden core or an iron core, wrapped firmly with a covering, and accompanied by a product inspection certificate. 7.3 The storage and handling of the belt shall be in accordance with GB6757. 348
A1 Subject content and scope of application
HG2539-93
Appendix A
Conveyor belt propane burner combustion test method (supplement)
This appendix specifies the test method for determining the flame retardancy of conveyor belts using the propane combustion method. A2 Test device
A2.1 The tunnel
is rectangular with a cross-sectional size of 2m×2m. An exhaust fan is installed to circulate air in the tunnel and is used to place the test bench. A2.2 Test bench
As shown in Figure A1, it is a rectangular frame structure made of steel pipes with an outer diameter of 20~25mm. The bench is 2.20m long and 1.25m wide, with the highest point 350mm from the ground. There are two angle steels on the upper part of both sides of the bench, with several notches on the angle steels. These notches are used to place 15 stainless steel bars with a diameter of 10mm and a length of 1.4mm. The stainless steel bars can rotate freely in the notches. The bench is used to place the sample (see Figure A).
A2.3 Burner
As shown in Figure A2, a seamless steel pipe with an outer diameter of 20~25mm is welded into a square frame with a side length of 450mm and a height of 220mm. There are 52 jet holes with a diameter of 1.5mm±0.1mm on the top of the steel pipe, with a hole spacing of 50mm. A2.4 Fuel
It is bottled propane gas with a purity of more than 95%. The propane gas enters the burner through a high-pressure hose with an inner diameter of at least 6mm and a pressure reducing valve. Before and during the test, the propane core should be immersed in water at a temperature of 25℃±3℃, and its immersion height is 2/3 of the height. The propane gas flow can be controlled by a standard orifice plate with a thickness of 1.7mm and an aperture of 2.5mm, installed at the burner input end. A high-precision pressure gauge is installed in front of the orifice plate, and a flow meter can also be installed in front of the pressure reducing valve. During the 10min test time, the consumption of propane gas should be 1.30kg±0.05kg. At the end of each test, the weight of the remaining propane gas shall not be less than 10% of the weight when it is filled.
A3 Sample preparation
A3.1 Sample
When the thickness of the upper and lower covering layers is the same, the length shall not be less than 4m. When the thickness of the upper and lower covering layers is different, the length shall not be less than 6m. When the longitudinal full-thickness tensile strength is less than or equal to 1250N/mm, the width is 800mm; when the longitudinal full-thickness tensile strength is greater than 1250N/mm, the width is 1000mm.
A3.2 Test Specimen
Cut a specimen with a length of 2000mm±10mm and a width equal to the full width of the strip from the sample. When the thickness of the upper and lower covering layers is the same, there are 2 specimens; when the thickness of the upper and lower covering layers is different, there are 3 specimens.
A4 Test Procedure
Before the test, place the specimen flat at room temperature above 0℃ for more than 24 hours to eliminate bending deformation. a.
b. Place the test bench in the center of the tunnel and make its longitudinal center line coincide with the center line of the tunnel. c. Place the burner in the center of the tunnel and at the air inlet end of the test bench. Its 4 parallel steel pipes are parallel to the longitudinal center line of the bench, and the distance from the top surface of the burner to the top surface of the test bench is 130mm±5mm. The horizontal jet hole at the front end of the burner is 50mm away from the horizontal edge of the front end of the test bench, as shown in Figure A1.
HG 2539—93
Regulator plate with 1.7mm
diameter 2.5mm
35±
HG 2539—93
450±10
52 holes with a diameter of 1.5±0.1
Figure A2 Propane burnerwwW.bzxz.Net
d. Turn on the exhaust fan to allow air to flow through the test bench. Adjust the air supply so that the wind speed at the center of the test bench, 750mm from the front end of the test bench and 350mm from the ground, is 1.5±0.1m/s. e. Place the samples on the test bench one by one and test them one by one. During the test, the longitudinal center line of the sample coincides with the center line of the test bench, and one end of the sample is flush with the front end of the test bench. f. When the thickness of the upper and lower covering layers of the conveyor belt is the same, the upper and lower covering layers are tested downwards respectively. When the thickness of the upper and lower covering layers of the conveyor belt is different, the upper and lower covering layers shall be tested downwards respectively first, and the side with the worse measured value shall be tested again with the third sample. g. Ignite the burner, turn off the burner after burning for 10 minutes, and remove it from the test bench to prevent the melted and charred materials from falling on the burner and blocking the jet hole. When all the open flames and flameless combustion disappear, remove the sample and measure the remaining full width length of the sample. h. Notes
If the sample is damaged because it curls toward the burner, the test should be stopped and the sample should be re-tested. In order to prevent the sample from curling during the test, it can be easily tied to the test bench with wire, but it should not be tied too tightly to avoid preventing the sample from shrinking slightly during the heating process.
A5 Evaluation of test results
The criteria for evaluating whether it is burnt are:
a. Burnt includes any visible damage, such as brittleness, hardening, cracking, bubbles and other damage that was not originally there. b. Before measurement, the smoke marks and oil stains on the surface of the sample can be wiped off with a dry cloth. The presence of soot, deposition or loss of gloss on the surface of the belt due to burning shall not be considered as burnt.
c. Bubbles with a size of no more than 5mm in each direction or other small damages no more than 5mm are handled as follows: Small damages with no more than 5 burn points are not considered as damage. Small damages separated by more than 25mm are also not considered as damage. Any more small damages forming a circle with a diameter of no more than 50mm on the surface of the sample, and the distance between each group is more than 300mm, are also not considered as damage.
The remaining full width unburned length of the upper and lower covering layers of the sample should be as shown in L in Figure A3, and measured with a steel tape along the longitudinal direction of the sample and the surface of the sample d.
.
A6 Test result expression
HG2539—93
○ in the figure indicates bubbles on the surface of the sample
The center indicates the burned part of the sample
Figure A3 Test piece damage inspection diagram
The unburned length of the full width of the upper and lower surfaces of each sample. The self-extinguishing time of the open flame and flameless combustion of each sample. Additional remarks:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by the Zaozhuang Rubber Factory and Qingdao Rubber Industry Research Institute. The main drafters of this standard are Dai Lixin and Tao Dajun. Type 1 of this standard adopts the Australian standard AS1333—88 Steel Cord Rubber Conveyor Belt. 3521 Sample
When the thickness of the upper and lower covering layers is the same, the length shall not be less than 4m. When the thickness of the upper and lower covering layers is different, the length shall not be less than 6m. When the longitudinal full-thickness tensile strength is less than or equal to 1250N/mm, the width shall be 800mm; when the longitudinal full-thickness tensile strength is greater than 1250N/mm, the width shall be 1000mm.
A3.2 Sample
Cut a sample with a length of 2000mm±10mm and a width equal to the full width of the strip from the sample. When the thickness of the upper and lower covering layers is the same. 2 samples; when the thickness of the upper and lower covering layers is different, 3 samples.
A4 Test procedure
Before the test, place the sample flat at a room temperature above 0℃ for more than 24h to eliminate bending deformation. a.
b. Place the test bench in the center of the laneway, and make its longitudinal center line coincide with the center line of the laneway. c. The burner is placed in the center of the tunnel and at the air inlet end of the test bench. Its four parallel steel pipes are parallel to the longitudinal center line of the bench, and the distance from the top surface of the burner to the top surface of the test bench is 130mm ± 5mm. The horizontal jet hole at the front end of the burner is 50mm away from the horizontal edge of the front end of the test bench, as shown in Figure A1.
HG 2539—93
The regulator plate has 1.7mm
diameter 2.5mm
35±si
HG 2539—93
450±10
52 holes with a diameter of 1.5±0.1
Figure A2 Propane burner
d. Turn on the exhaust fan to make air flow through the test bench. Adjust the air supply volume so that the wind speed at the air inlet 750mm from the front end of the test bench and 350mm from the ground is 1.5±0.1m/s. e. Place the samples on the test bench one by one and test them. During the test, the longitudinal center line of the sample coincides with the center line of the test bench, and one end of the sample is flush with the front end of the test bench. f. When the thickness of the upper and lower covering layers of the conveyor belt is the same, the upper and lower covering layers are tested downward respectively. When the thickness of the upper and lower covering layers of the conveyor belt is different, first test the upper and lower covering layers downward respectively, and repeat the test once with the third sample on the side with the worse measured value. g. Ignite the burner, turn off the burner after burning for 10 minutes, and remove it from the test bench to prevent melted and charred materials from falling on the burner and blocking the jet hole. When all open flames and flameless combustion disappear, remove the sample and measure the remaining full width length of the sample. h. Notes
If the sample is damaged due to curling toward the burner, the test should be stopped and the sample should be retested. To prevent the sample from curling during the test, it can be easily tied to the test bench with wire, but it should not be tied too tightly to prevent the sample from shrinking slightly during the heating process.
A5 Evaluation of test results
The criteria for evaluating whether it is burnt are:
a. Burnt includes any visible damage, such as brittleness, hardening, cracking, bubbles and other damage that was not originally there. b. Before measurement, the smoke marks and oil stains on the surface of the sample can be wiped off with a dry cloth. The phenomenon of soot, deposition or loss of gloss due to burning on the surface of the belt should not be judged as burnt.
c. Bubbles with a size of no more than 5mm in each direction or other small damages of no more than 5mm are handled as follows: Small damage with no more than 5 burn points is not considered damage. Small damage separated by more than 25mm is also not considered damage. Any more small damages forming a circle with a diameter of no more than 50mm on the surface of the specimen, and the distance between each group is more than 300mm, are not considered damaged.
The remaining full width unburned length of the upper and lower covering layers of the specimen should be as shown in L in Figure A3, and measured with a steel tape along the longitudinal direction of the specimen and the surface of the specimen d.
A6 Test result expression
HG2539—93
○ in the figure indicates bubbles on the surface of the specimen
The center indicates the burned part of the specimen
Figure A3 Specimen damage inspection diagram
The full width unburned length of the upper and lower surfaces of each specimen. The self-extinguishing time of the open flame and flameless combustion of each specimen. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by the Zaozhuang Rubber Factory and Qingdao Rubber Industry Research Institute. The main drafters of this standard are Dai Lixin and Tao Dajun. This standard type 1 refers to the Australian standard AS1333-88 steel cord rubber conveyor belt. 3521 Sample
When the thickness of the upper and lower covering layers is the same, the length shall not be less than 4m. When the thickness of the upper and lower covering layers is different, the length shall not be less than 6m. When the longitudinal full-thickness tensile strength is less than or equal to 1250N/mm, the width shall be 800mm; when the longitudinal full-thickness tensile strength is greater than 1250N/mm, the width shall be 1000mm.
A3.2 Sample
Cut a sample with a length of 2000mm±10mm and a width equal to the full width of the strip from the sample. When the thickness of the upper and lower covering layers is the same. 2 samples; when the thickness of the upper and lower covering layers is different, 3 samples.
A4 Test procedure
Before the test, place the sample flat at a room temperature above 0℃ for more than 24h to eliminate bending deformation. a.
b. Place the test bench in the center of the laneway, and make its longitudinal center line coincide with the center line of the laneway. c. The burner is placed in the center of the tunnel and at the air inlet end of the test bench. Its four parallel steel pipes are parallel to the longitudinal center line of the bench, and the distance from the top surface of the burner to the top surface of the test bench is 130mm ± 5mm. The horizontal jet hole at the front end of the burner is 50mm away from the horizontal edge of the front end of the test bench, as shown in Figure A1.
HG 2539—93
The regulator plate has 1.7mm
diameter 2.5mm
35±si
HG 2539—93
450±10
52 holes with a diameter of 1.5±0.1
Figure A2 Propane burner
d. Turn on the exhaust fan to make air flow through the test bench. Adjust the air supply volume so that the wind speed at the air inlet 750mm from the front end of the test bench and 350mm from the ground is 1.5±0.1m/s. e. Place the samples on the test bench one by one and test them. During the test, the longitudinal center line of the sample coincides with the center line of the test bench, and one end of the sample is flush with the front end of the test bench. f. When the thickness of the upper and lower covering layers of the conveyor belt is the same, the upper and lower covering layers are tested downward respectively. When the thickness of the upper and lower covering layers of the conveyor belt is different, first test the upper and lower covering layers downward respectively, and repeat the test once with the third sample on the side with the worse measured value. g. Ignite the burner, turn off the burner after burning for 10 minutes, and remove it from the test bench to prevent melted and charred materials from falling on the burner and blocking the jet hole. When all open flames and flameless combustion disappear, remove the sample and measure the remaining full width length of the sample. h. Notes
If the sample is damaged due to curling toward the burner, the test should be stopped and the sample should be retested. To prevent the sample from curling during the test, it can be easily tied to the test bench with wire, but it should not be tied too tightly to prevent the sample from shrinking slightly during the heating process.
A5 Evaluation of test results
The criteria for evaluating whether it is burnt are:
a. Burnt includes any visible damage, such as brittleness, hardening, cracking, bubbles and other damage that was not originally there. b. Before measurement, the smoke marks and oil stains on the surface of the sample can be wiped off with a dry cloth. The phenomenon of soot, deposition or loss of gloss due to burning on the surface of the belt should not be judged as burnt.
c. Bubbles with a size of no more than 5mm in each direction or other small damages of no more than 5mm are handled as follows: Small damage with no more than 5 burn points is not considered damage. Small damage separated by more than 25mm is also not considered damage. Any more small damage forms a circle with a diameter of no more than 50mm on the surface of the specimen, and the distance between each group is more than 300mm, which is not considered as damage.
The remaining full width unburned length of the upper and lower covering layers of the specimen should be as shown in L in Figure A3, and measured with a steel tape along the longitudinal direction of the specimen and the surface of the specimen d.
A6 Test result expression
HG2539—93
○ in the figure indicates bubbles on the surface of the specimen
The center indicates the burned part of the specimen
Figure A3 Specimen damage inspection diagram
The full width unburned length of the upper and lower surfaces of each specimen. The self-extinguishing time of open flame and flameless combustion of each specimen. Additional remarks:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. This standard was drafted by the Zaozhuang Rubber Factory and Qingdao Rubber Industry Research Institute. The main drafters of this standard are Dai Lixin and Tao Dajun. This standard type 1 refers to the Australian standard AS1333-88 steel cord rubber conveyor belt. 352
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