This standard specifies the equipment, instruments, test procedures and determination of test results for explosives deflagration resistance. This standard applies to explosives for coal mines. MT 378-1995 Determination method and determination rules for deflagration resistance of explosives for coal mines MT378-1995 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of China
Determination method and judgment rules for the anti-deflagration property of explosives for coal mines
1 Subject content and scope of application
MT 378-1995
This standard specifies the determination device, equipment, determination steps and determination results of the anti-deflagration property of explosives. This standard applies to explosives for coal mines.
2 Reference standards
GB1468 Tracing paper
GB0031 Industrial electric detonator
GB12437 Industrial powdered ammonium nitrate explosive
WJ561 Black powder
3 Terminology
Anti-deflagration: anti-deflagrability; anti-deflagratingproperty The ability of explosives to resist deflagration. 4 Method Summarybzxz.net
Put the explosive roll under test in a sealed steel white gun bore and subject it to artificially created high temperature and high pressure environment. Finally, observe the combustion state of the explosive roll under test and use it to determine the anti-deflagration property of the explosive. 5 Determination Device and Equipment
5.1 Deflagration White Gun
The outer diameter of the steel deflagration Japanese gun is 560±1mm; the bore diameter is 57±0.5mm and the length is 820±1mm. The front and rear ends of the bore are sealed with threaded sealing plugs. There is a detonator foot line hole in the middle of the front sealing plug, and a cover plate tightened with screws is used to seal the foot line hole (see Figure 1).
5.2 Sealing rubber ring
Made of 5±0.2mm thick rubber plate according to the diameter of the sealing plug.5.3 The mold for rolling the test drug roll paper
The diameter is 35±0.1mm, with a vent hole in the center.5.4 Sulfuric acid paper
Sulfuric acid paper in accordance with GB1468.
Approved by the Ministry of Coal Industry of the People's Republic of China on January 16, 1995 and implemented on May 1, 1995
MT 378-1995
Figure 1 Schematic diagram of the Japanese deflagration gun
1—white gun body; 2—front end sealing plug; 3—rear end sealing plug; 4—main explosive roll; 5-tested roll; 6—sealing rubber ring 7—cover plate; 8—foot line
5.5 The mold for rolling the paper roll of the main explosive
Diameter 250.1mm, with a vent hole in the center.
5.6 The mold for the main explosive roll to pass through the detonator cavity
Diameter 25±1mm, with a protruding end at the front end with a diameter equivalent to the outer diameter of the No. 8 paper shell detonator and a length equivalent to the height of the detonator charge. 5.78 paper shell electric detonator
Complies with the provisions of GB8031.
5.82 water-resistant coal mine explosive
Complies with the provisions of GB12437, its component content (%): nitrate Ammonium nitrate
TNT
5.9 Black powder
Complies with the provisions of WJ561, and its component content (%): Potassium nitrate
5.10 Electric ignition head
Complies with the provisions of GB8031.
5.11 Tray balance
Sensitivity 0.5g.
6 Determination preparation
6.1 Preparation of main explosive roll
6.1.1 Determination of powdered explosive
Use the mold specified in Article 5.5 to roll the sulfuric acid paper cut to the specified size (170mm×100mm) into a double-layer paper tube with a bottom and a height of 75mm. Pour the weighed 15g No. 2 water-resistant coal mine explosive into the paper tube, and then use the mold specified in Article 5.6 to lightly roll the explosive 654
MT 378--1995
Lightly compact to the specified density. Take out the mold, insert the detonator into the hole pressed out by the mold, and fix the detonator and the mouth of the charge roll with a foot line for later use. 6.1.2 Determination of water-containing explosives
The main explosive charge roll is black powder, which is ignited with an ignition head with a foot line. First, cut the sulfuric acid paper according to the specified size (230mm×200mm) into a bottom, high 6.2 Preparation of the explosive roll to be tested
6.2.1 Determination of powdered explosives
Use the sulfuric acid paper cut to the specified size (230mm×100mm) to roll a double-layer paper roll with a bottom and a height of 65mm using the mold specified in 5.3. Pour the weighed 30g of the explosive to be tested into the paper roll, gently compact it to the specified density with the mold, and fold the open end for use. At the same time, take a sample for moisture analysis. 6.2.2 Determination of water-containing explosives
Use the weighed 30g of the explosive to be tested to load the sulfuric acid paper of the specified size (230mm×100mm) for use. 7 Measurement steps
7.1 Wipe clean the inner wall of the white gun bore and the front and rear sealing plugs. 7.2 Place a rubber gasket in the rear port of the white gun bore, then fix the rear sealing plug and tighten it with a wrench. 7.3 Gently push the explosive roll to be tested from the front white gun mouth into the rear end of the bore. 7.4 Place the main explosive roll in the front hole of the white gun bore and place the sealing rubber ring. 7.5 Pass the two leg wires through the center hole of the front sealing plug, fix the front sealing plug on the front gun bore, and tighten it with a wrench. 7.6 Finally, fix the cover plate on the end face of the front sealing plug with screws. 7.7 Connect the two leg wires to the two output ends of the detonator respectively. 7.8 Turn the detonator switch in a safe place to supply power to the detonator for detonation. There should be no leakage in the front and rear sealing plugs during detonation, otherwise the measurement will be invalid.
7.9 After detonation, first remove the detonator switch and disconnect the terminals. After waiting for 2 minutes, unscrew the cover on the front sealing plug, and then unscrew the sealing plugs at the front and rear ends. Finally, observe whether the tested explosive volume is fully burned and make a record. Full combustion means that the tested explosive volume is completely burned, leaving only a melted salt cake.
Note: The explosives and detonators used for measurement should be within the effective warranty period. The moisture content of powdered explosives should be less than 0.5%. The measurement environment temperature is 20-30℃.
8 Determination of measurement results
The tested explosive is qualified if it is measured ten times continuously and no full combustion occurs. If there is one full combustion in ten times, ten retests are allowed. It is still qualified if no full combustion occurs in the retest. If there are two or more full combustions in the initial test, it is judged to be unqualified. Additional instructions:
This standard is proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Blasting Technology and Explosives Products Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted by the Fushun Branch of the China Coal Research Institute. The drafters of this standard are Zeng Xi, Liu Guohua, Cui Yingwen, Han Xuebo, Wang Jingying, Han Bin, and Fu Baocan. This standard is interpreted by the Fushun Branch of the China Coal Research Institute.
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