MT 64-1982 English PDF

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MT 64-1982: (XU electric detonator mines)
Status: Obsolete

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
MT 64-1982	239	Add to Cart	2 days	(XU electric detonator mines)	Obsolete

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Basic data

Standard ID: MT 64-1982 (MT64-1982)
Description (Translated English): (XU electric detonator mines)
Sector / Industry: Coal Industry Standard
Word Count Estimation: 6,620
Date of Issue: 2/21/1983
Date of Implementation: 7/1/1983
Summary: This standard applies to methane or coal dust explosion hazard of electric detonators used in a mine, including mine allowable instantaneous electric detonators and coal allowable extension millisecond electric detonators.

MT64:

---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.
(XU electric detonator mines) People's Republic of China Industry Standards MT 64-82 Coal mine allowable electric detonator 1983-02-21 ratified Approved by the Ministry of Coal Industry

Contents

1 Technical requirements 1 2 Inspection rules and test methods 1 3 Packaging and marking 1 4 Guarantee period 1 MT 63-82 Coal mine allowable electric detonator This standard applies to electric detonators used in mines where there is a danger of explosion of biogas or coal dust, including transient detonators for coal mines and coal mines. Delay the electric detonator in milliseconds.

1 Technical requirements

1.1 Appearance 1.1.1 Detonator shells are not allowed to use aluminum shells. The surface of the detonator is not allowed to have floating powder, rust, cracks, or cracks in the paper layer. Slight dirt, medicine allowed Defects such as column damage and mechanical damage to the casing. 1.1.2 Aluminium core wire is not allowed for the foot wire, and the insulation wire is not allowed to be damaged and the core wire rust that affects the performance is not allowed. 1.1.3 The feet must be of two colors. 1.1.4 The sealing plug is not allowed to loosen or come out. 1.2 Pin line The iron wire plastic blasting wire conforming to JB672-77 "Polyvinyl chloride insulated blasting wire" is used for the leg wire, and the length is 2 meters. According to user requirements, Production of detonators of other lengths. 1.3 Charge 1.3.1 The detonating agent is dinitrodiazophenol, and the charge is not less than 0.28 grams, and those without reinforced caps are not less than 0.32 grams. 1.3.2 Explosives are black cord gold or a mixture of black cord gold and a flame retardant, and the net black gold charge of permissible detonators in a paper shell is not less than 0.60 grams; Copper tube shell or copper-clad iron shell is not less than 0.40 g. In order to facilitate the press molding, it is allowed to add no more than 7.5% passivating agent to the explosive. 1.4 Resistance 1.4.1 The bridge wire of the ignition element shall always use nickel-chromium resistance wire, and the total resistance of the detonator with a length of 2 meters is not more than 6.3 ohms. 1.4.2 The tolerance of the bridge wire resistance is not greater than 0.8 ohms. 1.5 Seal fastness The static tensile test is used, with a load of 2 kg for 1 minute. Visible movements of the detonator are not allowed. 1.6 minimum ignition current Constant DC current of not more than 0.7A, guaranteed by product design. 1.7 Extension time 1.7.1 The nominal seconds of each section of detonator permissible milliseconds are listed in Table 1.

1 Coal mine allowable millisecond detonator seconds series

Section number First series (millisecond) Second series (millisecond) MT 63-82 1.7.2 The seconds inspection should meet the requirements of 2.7 Chinese formulas (3) and (4) at the same time, and the products that pass the inspection when k = 2 in the formula are first-level accuracy Product; when k = 1.5, it is a second-level precision product. 1.8 Deferred Segmentation Flag Segments 1 to 5 are distinguished by different colored feet. The regulations are as shown in Table 2; paragraphs 6 to 9 are marked with a segment number tag on each detonator leg. 2 1 ~ 5 segments of skirting color Segment 1 2 3 4 5 Base line color gray, red gray, yellow gray, blue gray, white green, red 1.9 Vibration test Explosions or defects such as open circuit, short circuit, unstable resistance, out of range resistance and structural damage are not allowed. 1.10 Series test 20 detonators are connected in series, and a constant DC current of 1.2 amps is passed. 1.11 Safe current test Pass a constant DC current of 0.05A for 5 minutes, and no explosion is allowed. 1.12 Lead plate test Blind fires, incomplete detonation, and the diameter of the lead-through plate smaller than the outer diameter of the detonator are not allowed. If the outer diameter of the detonator exceeds 8 mm, blow through lead The hole diameter of the board is qualified as not less than 8 mm. 1.13 Biogas safety test Detonation frequency should not exceed 1/25 or 2/50.

2 Inspection rules and test methods

2.1 Allowable instant detonators in coal mines do not exceed 50,000 rounds, and coal mine allowable millisecond detonators do not exceed 6000 rounds Approved (1 paragraph does not allow more than 25,000 to form a batch), submitted for acceptance. Each batch of products shall be accompanied by a certificate of conformity. 2.2 Appearance and packaging inspection 100 detonators are randomly selected from each batch for appearance inspection (the packaging is fully inspected at the time of sampling). 3.1 ~ 3.4, otherwise the batch will be repaired. 2.3 Resistance test Forty-five rounds of randomly selected detonators that pass the visual inspection are tested for resistance; no open circuit, short circuit, unstable resistance, or out of range Or other defects, or the batch of detonators will be repaired. 2.4 Vibration test Take the 45-ton detonator that passed the appearance and resistance tests and put it in a carton, plug the gap, and place it in the center of the test wooden box. "Vibration tester", with a frequency of 60 ± 1 times/minute, a drop height of 150 ± 2 mm, continuous vibration for 5 minutes, the test results should meet this standard 1.9 Provisions. If 1 round has defects such as structural damage, unstable or out of range, open circuit, short circuit, etc., take the same number and try again. Describe the defect, double the number and repeat the test. If an explosion occurs, the batch is scrapped. After three consecutive batches of tests are qualified, it is allowed to test at least once a day. When unqualified or retested, the test cycle shall be repeated according to the above regulations. 2.5 Safe current test Take 20 rounds of detonators that have passed the resistance test (or vibration test) and pass a constant DC current of 0.05 A for 5 minutes. No explosion is allowed. Three consecutive batches of tests are allowed to be tested at least once a week after passing. The batch is scrapped when unqualified, the cause of the unqualified is found, and the test cycle is restarted Implement in accordance with the above provisions. 2.6 Serial lead plate test Take 20 rounds of detonators that have passed the resistance test (or vibration test, safe current test), and each one is placed vertically in accordance with WJ1044-78 The lead plate of the `` lead plate for industrial detonator test '' (the thickness of the lead plate for concave bottom detonators is 5 ± 0.1 mm, and the flat bottom detonator is 3 ± 0.1 mm) at the center, MT 63-82 Detonation in series, the results should meet the provisions of 1.10, 1.12 of this standard. If there is 1 blind fire or incomplete detonation, double the number and try again. also. If there are 2 blind fires or incomplete detonation, the batch of detonators is unqualified. If there are 1 rounds of holes that fail to pass through the lead plate, take the same number and repeat the test; If there are 2 unqualified rounds, the test will be doubled and no more will be allowed. If two defects occur at the same time, the batch of detonators shall not be retested. 2.7 Deferred seconds test Take 25 rounds of detonators that have passed the resistance test (or vibration test), and detonate them with a constant DC current of 1.2A one by one with an accuracy of not less than The 0.1 millisecond time measurement instrument measures the delay in seconds, and the recorded value is accurate to 1 millisecond. Calculate the average seconds by using the test results according to formulas (1) and (2) X and standard deviation S. X = i = 1 Xi S = i = 1 (Xi-X) 2 n-1 In the formula. n --- determining the number of hair; Xi --- The measurement seconds of the i-th detonator. If the calculated X and S satisfy formulas (3) and (4) at the same time, the batch is qualified, otherwise it is unqualified. X KS≤U ( X-KS≥L ( In the formula. U, L --- are called the upper boundary and the lower boundary, the values are shown in Table 3; K --- is the accuracy index specified in 1.7.2. If a blind fire is found during the second test, it is dealt with in accordance with the provisions of Article 2.6. If a retest is required, only 40 rounds are required for the tandem test, but not at the same time. Lead plate test. In the second test, if one batch is found to exceed 130 milliseconds, the batch is not accepted as a millisecond detonator. 2.8 Seal fastness test 3-second acceptance threshold Section number First series (milliseconds) Second series (milliseconds) LULU 1-14-8.5 2 14 37.5 8.5 21.5 3 37.5 62.5 21.5 31.5 4 62.5 87.5 31.5 44.0 5 87.5 112.5 44.0 56.5 6 56.5 69.0 7 69.0 81.5 8 81.5 94.0 9 94.0 100.5 Note. The first paragraph of each series has no lower boundary value L, so there is no need to calculate formula (4). Take 10 detonators that pass the vibration test for static tensile test. The test results shall meet the requirements of Article 1.5 of this standard. If there are 1 rounds If the movement is visible to the naked eye, double the number and repeat the test. If there is still movement, the batch will fail. After passing three consecutive batches of tests, at least one test per week is allowed If the test fails, the test cycle shall be performed again according to the above regulations. 2.9 Biogas safety test MT 63-82 Press MT 62-82 "Regulations on the Safety of Coal Mine Permissible Electric Detonators and Their Inspection Methods" for inspection. After obtaining or replacing the certificate of conformity, The factory is not a routine inspection item, and the factory guarantees it from the process.

3 Packaging and marking

3.1 100 rounds per box (those with a length of more than 2 meters can be appropriately reduced per box) with a mark. The box must be sealed tide. 1000 rounds per box (the long line allows proper reduction). There must be no loosening of the detonator in the box and in the box. 3.2 Packing boxes with a thickness of not less than 14 mm (no less than 12 mm allowed for the bottom and cover) or fiberboard with wooden frame (fiberboard thickness (Not less than 3 mm; wooden frame slats are 50 mm wide and 14 mm thick). There must be no decay, and iron nails must not be protruding in the box. The packing box should be firm. 3.3 The product manual should be attached to the packing box, and the factory name, product name, segment, quantity, batch number, gross weight, volume, manufacturing date, "Handle with care" and "Fire and moisture proof" and the explosives logo. If the product is separately produced according to the length required by the user, it should also be Indicate the length of the feet. 3.4 The packing box should be sealed with seals or fire paint or lead seals.

4 Guarantee period

Under the original packaging conditions, the detonator is stored in a well-ventilated and dry warehouse.The warranty period is from the date of manufacture. In the half year, the metal shell is two years. Additional information. This standard was drafted by Chen Zhengheng of the Ministry of Coal Industry. ......

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