Some standard content:
MT 709-1997
This standard refers to the standards of the European Community in part according to the situation in my country and makes provisions, such as carbon monoxide permeation concentration, carbon monoxide permeation cumulative amount and suction temperature.
It will be implemented from July 1, 1998, with a transition period of one year. From July 1, 1999, all carbon monoxide filter self-rescuers used in coal mines shall comply with the provisions of this standard.
Appendix A of this standard is the appendix of the standard.
Appendix B of this standard is the appendix of the suggestion.
This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted by the Fushun Branch of the General Coal Research Institute. The main drafters of this standard are: Li Chuanhong and Ma Shanqing. This standard is entrusted to the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry for interpretation. 467
1 Scope
Coal Industry Standard of the People's Republic of China
Self-rescuer of carbon monoxide filter for coal minesMT709--1997
This standard specifies the type, classification, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of carbon monoxide filter self-rescuer for coal mines.
This standard applies to carbon monoxide filter self-rescuer for coal mines (hereinafter referred to as self-rescuer). 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB.527—83 General requirements for physical test methods for vulcanized rubber GB/T528-92 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T531--92 Test method for Shore A hardness of vulcanized rubber GB/T1410-89 Test method for volume resistivity and surface resistivity of solid insulating materials GB/T2423.17—81 Basic environmental testing procedures for electrical and electronic products Test Ka: Salt spray test method GB/T2891-95 Performance test method for filter canisters of filter-type gas masks GB/T3512—83 Hot air aging test method for rubber GB3836.1—83 General requirements for explosion-proof electrical equipment for explosive atmospheres GB/T6166-85 Performance test method for high-efficiency filter materials Transmittance and resistance GB/T10111-88 Random sampling method using random number generator HG4-841-81 Determination method for brittle temperature of vulcanized rubber 3 Definitions
This standard adopts the following definitions.
3. 1 Mass. of whole self-rescuer The mass of the finished self-rescuer excluding the rubber protective cover and the accompanying bag. 3. 2 Mass of filter canister The mass of the components including the mouthpiece assembly, exhaust valve assembly, desiccant, catalyst, medicine canister and layer plate. 3.3 Carbon monoxide permeation concentration Carbon monoxide permeation concentration The concentration of carbon oxide in the inhaled air flow after passing through the filter. 3.4 Carbon monoxide permeation accumulation volume Carbon monoxide permeation accumulation volume The sum of the carbon monoxide permeation values calculated according to formula (1) based on the measured carbon monoxide permeation concentration values within the specified protection time. 3.5 Exhalation resistance Exhalation resistance The resistance value measured when 30L/min and 85L/min positive pressure stable airflows are passed through the filter mouthpiece after the protection performance test. 3.6 Inhalation resistance Approved by the Ministry of Coal Industry of the People's Republic of China on December 30, 1997 468
Implemented on July 1, 1998
MT709—1997
After the protective performance test, the resistance value measured when 30L/min and 85L/min negative pressure stable airflows are passed through the filter mouthpiece. 3.7 Inhalation temperature In the protective performance test, the temperature of the inhaled gas during inhalation is measured at 45mm from the filter mouthpiece. 3.8 Maximum carbon monoxide permeation concentration at the begging of test Within 5 minutes after the start of the protective performance test, the maximum value of the carbon monoxide permeation concentration in the inhaled air flow after passing through the filter. 3.9 Strip sealing breaking power The pulling force when the handle is opened to break the sealing strip. 3.10 Self-rescuer airtightness sealed ability The degree of isolation between the self-rescuer and the outside atmosphere. 4 Product type, classification and basic parameters
4.1: Type
Direct mouth-holding type.
4.2 Classification
According to the purpose, it is divided into two types: protective self-rescuer and training self-rescuer; according to the protection time, it is divided into three types: 40 type, 60 type and 90 type. 4.3 Basic parameters
The basic parameters of the product are shown in Table 1:
Table 1 Basic parameters
5 Technical requirements
Protection time
Whole machine quality
Filter quality
5.1 The product shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.2 Conditions of use:
Appearance volume
≤1700
≤1700
5.2.1 Applicable to mines without coal, gas and carbon dioxide outbursts, the oxygen concentration in the ambient atmosphere is not less than 18%, the carbon monoxide concentration is not more than 1.5%, and the air does not contain other toxic gases. 5.2.2 Limited to use for personal escape.
5.3 Carbon monoxide protection performance (hereinafter referred to as protection performance): The product meets the following requirements when the protection performance test is carried out according to the test method specified in this standard within the protection time specified in Table 1. 5.3.1 The carbon monoxide permeation concentration in the inhaled gas should not be greater than 0.02%. 5.3.2 The accumulated amount of carbon monoxide permeation in the inhaled air should not be greater than 200mL. 5.3.3 The initial peak value of the carbon monoxide permeation concentration in the inhaled air should not be greater than 0.06%. 5.3.4 Inhalation temperature
When the carbon monoxide concentration in the test gas is 1.0%, the maximum temperature of the inhaled gas should not be greater than 60℃; when the carbon monoxide concentration in the test gas is 1.5%, the maximum temperature of the inhaled gas should not be greater than 95℃. 5.3.5 Exhalation resistance and inhalation resistance
After the protective performance test, the exhalation resistance and inhalation resistance are measured, which should not be greater than the requirements in Table 2. 469
Test gas flow
Exhalation resistance, Pa
Inhalation resistance, Pawww.bzxz.net
MT 709—1997
Table 2 Inhalation resistance and exhalation resistance
5.3.6 The smoke filtering capacity of the self-rescuer with a smoke filter layer should be above 50%. 5.4 Structural requirements:
5.4.1 Air tightness of the self-rescuer
Under a pressure of 13.34kPa, maintain for 15s, the pressure drop should not be greater than 98Pa. 5.4.2 Air tightness of the exhalation valve
Under a negative pressure of 980Pa, maintain for 1min, the pressure rise should not be greater than 29Pa. 5.4.3 Field of view
The field of view below after wearing the filter should be no less than 40 degrees. 5.4.4 Impact resistance
5.4.4.1 After the drop test, its structure should not be damaged, and the air tightness of the self-rescuer should meet the requirements of 5.4.1. 85
5.4.4.2 After the rolling test, the outer shell coating shall not fall off, and other structures shall not be damaged, and meet the requirements of 5.3 and 5.4.1. 5.4.5 The outer shell of the self-rescuer should have a number plate. 5.4.6 It should be easy to carry and open.
5.4.7 The tensile force of the sealing belt should be 49N~118N. 5.4.8 The mouthpiece should be made of non-toxic and odorless rubber material, easy to bite, comfortable, and tight when closing the mouth. The mouthpiece will not fall off the mouth during escape and intense activities.
5.4.9 The thickness of the mouthpiece rubber cap should be uniform and elastic, and no cracks, holes, bubbles or missing edges are allowed. 5.4.10 The medicine can should have anti-rust measures, and the interface should not have obvious spots and longitudinal grooves. The connection between the mouthpiece set and the medicine can should be firm, reliable and airtight. 5.4.11
5.4.12 The tension of the headband should be appropriate.
5.4.13 The clamping force of the nose clip spring should be appropriate, and the nose clip pad should be matched to ensure that the nostrils are sealed and not easy to fall off. The placement of the nose clip during product assembly should remind the wearer not to forget to clip the nose clip after holding the mouthpiece. 5.4.14 The filter removal force should not exceed 98N. 5.4.15 The filter should not burn the wearer during normal use. 5.4.16 The exhalation valve should be sensitive and reliable, and should be able to prevent mechanical damage to the valve plate. 5.4.17 The filter should be equipped with a saliva baffle to prevent saliva from flowing into the medicine can. 5.4.18 There should be dust filtering measures in the filter to prevent dust in the medicine from entering the mouthpiece. 5.4.19 The product surface should be smooth and flat without obvious scratches, and should be equipped with a rubber protective cover when leaving the factory. 5.5 Material requirements:
.5.5.1 The materials used in the filter breathing system must not decompose toxic, harmful, or odorous gases. 5.5.2 The shell and fasteners must be made of corrosion-resistant or corrosion-resistant materials. 5.5.3 Rubber and plastic materials should have good heat resistance, cold resistance and aging resistance. 5.5.4 When the outer shell is made of light alloy, it should comply with the relevant provisions of GB3836.1. 5.5.5 The valid period for wearing and use (one shift operation) is not less than 3 years, and the valid period for storage is 5 years. 5.6 Training filter-type self-rescuer:
The training filter-type self-rescuer should be marked on the nameplate with red outer shell and no heat inhalation. Its appearance, quality, filter structure, exhalation resistance and inhalation resistance are the same as those of the filter-type self-rescuer products. 470
6 Test methods
6.1 Protective performance test
6.1.1 Test conditions as shown in Table 3:
Respiratory volume, L/min
Respiratory frequency, min-1
Respiratory ratio
Test gas flow rate, L/min
Absolute humidity of test gas, g/m
Concentration of carbon monoxide in test gas, %
Test gas temperature, ℃
Exhalation temperature, ℃
Distance between mouthpiece temperature measurement point and mouthpiece end face, mm Test product preheating requirements
6.1.2 Test equipment and instruments
MT 709-1997
Table 3 Test conditions for carbon monoxide protection
20.7~24.5
0.25, 1.0 (two are conventional test concentrations) 1.5 (type test concentration)
Adjust to 25±237±2 according to the absolute humidity condition of the test chamber
Put it in an environment of 20±5℃ for more than 2h before the test. The device used for the protection performance test is shown in Figure 1. The instruments and equipment used are shown in Table 4. 5
1 Respirator; 2- Exhalation valve; 3- Inhalation valve; 4- Exhaust fan, 5- Exhalation heating and humidifying device; 6- Carbon monoxide gas filter; 7- Filter; 8- Inhalation temperature measuring instrument, 9- Test chamber; 10- Dry and wet bulb thermometer; 11- Intake heating and humidifying mixer; 12, 13 Flowmeter; 1417 Drying tower; 15--0~2% infrared Linear carbon monoxide gas analyzer, 16-0~1000ppm infrared carbon monoxide gas analyzer
Figure 1 Schematic diagram of protective performance test device
Instrument name
Respirator
Exhalation valve
Exhalation valve
Centrifugal blower
Heating condenser
Carbon monoxide gas filter
Thermometer
Experimental record
Wet and dry bulb thermometer
Heating condenser
Float flowmeter
Float flowmeter
Drying tower
Infrared
Carbon monoxide
Analyzer
Carbon monoxide
Infrared
Analyzer
6.1.3 Test preparation
MT 709-1997
Table 4 Test equipment for protection performance
Specifications and instructions
Respiratory volume 10~40L/min, respiratory frequency 10~430r/min, respiratory ratio 1:1
Use compressed oxygen respirator exhalation valve, 30L/mn stable airflow to measure ventilation resistance less than 29Pa
Use compressed oxygen respirator exhalation valve, 30L/min stable airflow to measure ventilation resistance less than 2 9Pa
Air volume 700~1000m/h, pressure head 90mmH0
Manufactured according to Figure 2
CO rolling degree in the exhaust gas meets the requirements of environmental protection standards. Graduation value 0.5℃
0～100℃
Volume: 300mm.300mm.260mm, material is plastic plexiglass, iron plate, etc.
2 mercury oscillometers, measuring temperature range 0~50℃ Graduation value 0. 15℃
Manufactured according to Figure 2
Range 0.6~60m/h, accuracy 2.5 level
Range 0.016~0.16m/h, accuracy 2.5 level Volume 260m, 2 pieces, filled with block anhydrous calcium chloride Range 0~2% Graduation value 0.2%
Range 0~1000×10-6 Graduation value 10×10~6 Install and connect the test device according to Figure 1. Except for the respirator, the total volume of the test gas pipeline should not exceed 2La) The dry and wet bulb thermometers should be set in the same isothermal surface as the filter, that is, the distance from the filter should be kept equal; the depth of the dry and wet bulb thermometers inserted into the test chamber should be flush with the air inlet end face of the filter; b) Check the air tightness of the device. When a positive pressure of 1961Pa is established in the device and maintained for 1min, the pressure drop should not exceed 29Pa) calibrate the breathing rate and breathing volume of the artificial ventilator; d) calibrate the infrared carbon monoxide gas analyzer with a standard gas sample; e) adjust the temperature of the two heated humidifiers; f) calibrate the carbon monoxide intake flow rate and sample according to the connection method in Figure 1; g) maintain the experimental temperature within (20±5)℃: Note: When calibrating the infrared carbon monoxide gas analyzer and the carbon monoxide intake flow rate, turn on the exhaust air and the indoor carbon monoxide safety alarm. 6.1.4 Test method
After completing the drop test, rolling test, shell airtightness test and sealing tape tensile test, perform the protective performance test according to the following steps: a) Take out the filter and quickly install it in a fixed position in the test chamber, b) Close the test chamber door, then open the carbon monoxide gas supply switch and ventilation switch, directly ventilate the test chamber at a flow rate of (90±1) L/min, and turn on the air pump of the 0~2% infrared carbon monoxide gas analyzer 15. When the carbon monoxide concentration in the test chamber rises to the value specified by the test conditions, the carbon monoxide pipeline directly entering the test chamber will be closed and transferred to the pipeline mixed with air to continue supplying gas to the test chamber. At the same time, turn on the artificial respirator 1, timer and the air pump of the infrared carbon monoxide 0~1000×10-6 gas analyzer 16;
MT 709—1997
c) Observe and record the size and time of the initial peak value; d) Record the values of each measuring point every 5 minutes (including the carbon monoxide concentration value, inhalation temperature, dry-bulb temperature, etc. displayed by the two infrared instruments) until the test reaches the specified protection time, and then turn off the carbon monoxide intake; e) After the infrared analyzer indicates zero, turn off the artificial respirator, open the test box, take out the filter to perform the exhalation and inhalation resistance test. 6.1.5 Test results
a) Protection time;
b) Initial peak value of carbon monoxide;
c) Maximum carbon monoxide permeation concentration;
d) The accumulated carbon monoxide permeation is calculated using the following formula: M=15×10*
Where: M is the accumulated carbon monoxide permeation, mL; (CO%): +
(CO%), — the carbon monoxide concentration measured and recorded at the end of the protection time, %, (CO%); — the carbon monoxide concentration measured and recorded every 5 minutes, %; 1
(CO%), J
15×104—conversion factor (recording interval 5min×breathing volume 30L/min); e) the highest value of the inhalation temperature.
6.2 Determination of filter exhalation resistance and inhalation resistance 6.2.1 Test device and instruments and equipment
a) The test device is shown in Figures 2 and 3;
MT709-1997
1—connect to the air inlet pipe; 2—water supply bottle; 3—contact thermometer; 4—connect to the air outlet pipe; 5—electric heater Figure 2 Bubble moisture absorption type water saturator
1—filter; 2—mouthpiece joint; 3—tilt pressure gauge; 4—float flowmeter Figure 3 Exhalation resistance test device
MT 709-1997
1 filter, 2—true joint; 3—inclined pressure gauge, 4—float flow meter Figure 4 Suction resistance test device
b) Test air flow: (30t0.6)L/min(95±1)L/minc) Inclined pressure gauge: The measuring range is 0~1.96ka, and the graduation value is 9.8Pu; d) Float flowmeter: measuring range is 0~100L/min; accuracy is level 4; e) Positive and negative pressure air source;
f) The exhalation resistance and inhalation resistance of the filter should be tested immediately after the protection performance test. 6.2.2 Determination method
a) Connect the filter to the device according to Figure 3 and Figure 4, adjust the air flow to (30±0.6)L/min and (85±1.7)L/min, and measure the exhalation resistance and inhalation resistance R, respectively. b) Determine the resistance of the test device's air path Ro
6.2.3 Test results
The test results are used to calculate the inhalation resistance value and the exhalation resistance value according to the following formula: RRR
Where: R
The exhalation resistance or inhalation resistance of the filter, a, the ventilation resistance of the test device itself, Pa; R
-Measured exhalation resistance or inhalation resistance, Pa6.3 Smoke filtering capacity test
6.3.1 Test conditions
6.3.2 Test device, test method and test result calculation shall be in accordance with the provisions of GB/T6166, and the test results shall meet the requirements of 5.3.6. 6.4 Air tightness test of self-rescuer
The air tightness test of the self-rescuer adopts the negative pressure method or the positive pressure method, and the arbitration test adopts the negative pressure method. For the negative pressure method test, the test device is shown in Figure 5.
1—Vacuum dryer; 2 Self-rescuer to be tested; 3 Negative pressure gauge Figure 5 Negative pressure method airtightness test device
6.4.1.1 Instruments and equipment
a) Vacuum dryer, with a diameter of 240~300mm; b) Self-rescuer to be tested.
MT 709-1997
c) Negative pressure gauge: the measuring range is 0~20kPa, and the accuracy is 0.4 level. 6.4.1.2 Test method
a) Check the airtightness of the device;
b) Immerse the self-rescuer with the rubber protective cover removed in a vacuum dryer filled with water; c) Pump the negative pressure to (13.34±0.686) kPa; d) Keep it for 30 s and check whether there are bubbles floating. 6.4.1.3 Test results
If more than two consecutive bubbles float up for 30 seconds, it is unqualified; the bubbles floated up due to the gap of the product's external structure cannot be regarded as leakage.
6.4.2 Test by positive pressure method
6.4.2.1 Use ZJ self-rescuer airtightness tester, whose working pressure range is 12~~15kPa and the graduation value is 9.8Pa. 6.4.2.2 Test method
Operate according to the instruction manual of ZJ self-rescuer airtightness tester. 6.4.2.3 Test results
When the pressure reaches 13.34kPa, it is maintained for 15s, and the pressure drop is less than 98Pa, which is qualified. 6.5 Exhalation valve air tightness test
6.5.1 Test device and instruments
a) The test device is shown in Figure 6:
1-Regulating valve: 2-Airtightness verification container; 3-Exhalation valve: 4-Water column pressure gauge Figure 6 Schematic diagram of exhalation valve airtightness test device
b) Water column pressure gauge: the measuring range is 0~~2.94kPa, and the graduation value is 9.8Pa; c) Airtightness verification container: a rigid container with a volume of 2.5L±0.05L is used. 6.5.2 Test method
a) Check the airtightness of the test device. Seal the exhalation valve interface with a rubber plug, establish a negative pressure of 200Pa in the device, and there should be no air leakage; b) Connect the exhalation valve to the interface of the test device, establish a negative pressure of 100Pa in the device, maintain for 1 minute, and record the pressure rise value: 6.5.3 Test results
The pressure rise value in 1 minute should meet the requirements of 5.4.2. 6.6 Test of the visual field below when wearing the filter
According to GB/T2891.4, the test results should meet the requirements of 5.4.3 of this standard. 6.7 Tensile test of sealing strip
The following equivalent method can be used for testing. If a dispute occurs, 6.7.1 shall prevail. 6.7.1 Fix the self-rescuer on a standard tensile testing machine so that the direction of the tension forms an angle of 80 to 90 degrees with the horizontal plane of the self-rescuer opening handle, and measure the force to break the sealing strip.
6.7.2 Use a spring dynamometer to hook the opening handle so that the pulling force direction forms an angle of 75 to 85 degrees with the horizontal plane. Complete the measurement of the breaking force within 3s to 5s and record the pulling force when the sealing strip is broken. 6.7.3 Test results
The breaking force should meet the requirements of 5.4.7.
6.8 Drop test
MT 709—1997
Put a pine (or fir) board with a thickness of 50mm±5mm horizontally on the cement floor, and let the self-rescuer fall freely from a height of 1 meter for 3 times (once each for the front, side and upside down), check for damage and check the air tightness according to 6.4.1. 6.9 Rolling test
The test device is shown in Figure 7.
1 Motor; 2- Speed reducer; 3- Test box
Figure 7 Schematic diagram of rolling impact test device
6.9.1 Test equipment
The test box is a square box with an inner side length of 300mm made of (18±2)mm thick pine wood board, with the diagonal as the axis and a rotation speed of (60±2)r/min.
6.9.2 Test method
a) Put three self-rescuers with their protective covers removed into the test box at the same time and test them continuously for 10min at a rotation speed of (60±2)r/min; b) Take out the self-rescuers and check whether they are damaged according to 5.4.4.2, and test according to 5.4.1 and 5.3. 6.9.3 Test results
It shall meet the requirements of 5.3.1, 5.3.2, 5.3.3, 5.3.4, 5.3.5 and 5.4.1. 6.10 Filter removal force test
Hook the headband with a spring dynamometer for measurement, and the direction of the tension is consistent with the filter removal direction. The measured tension should meet the requirements of 5.4.14.
6.11 Product quality inspection
Weigh with a balance with a sensitivity of 1g.
6.12 Metal material corrosion resistance test
Test according to GB/T2423.17 for 48 hours. 6.13 Rubber material test
6.13.1 The preparation of the sample, test conditions, and processing of the test data are all carried out in accordance with GB527. 6.13.2 Tests such as breaking strength, elongation, and breaking permanent deformation are all carried out in accordance with GB/T528. 6.13.3 Hardness test is carried out in accordance with GB/T531. 6.13.4 Rubber material cold resistance test is carried out in accordance with HG4-841. The medium temperature in the low temperature tank is -35℃. 6.13.5 The aging test shall be conducted in accordance with GB/T3512. Aging test temperature: 120℃ for breathing valves, 100℃ for others; aging time: 24h;
Aging coefficient: The aging coefficient Kl expressed by tensile product shall be selected. 477
Inspection rules
MT 709--1997
7.1 Products shall be inspected and issued with a certificate of conformity by the quality supervision and inspection agency designated by the Ministry of Coal Industry in accordance with this standard before they can be produced.
7.2 Factory inspection:
Factory inspection shall be conducted by the manufacturing quality inspection department in accordance with the requirements of this standard. Products may only leave the factory after they have passed the inspection and issued a certificate of conformity. Factory inspection is divided into unit-by-unit inspection and sampling inspection. 7.2.1 Unit-by-unit inspection items and sampling inspection items are shown in Table 5. Inspection items
Technical requirements clauses
4.3 Table 1 Protection time
4.3 Table 1 Whole machine quality
Factory inspection
Inspection of each unit
Sampling inspection
Type inspection
Note: "—" means no inspection item, "" means inspection item; "☆" means main item, "△" means non-main item. The sampling quantity is 3% of the batch output, but should not be less than 3 units. 7.2.2
Judgment rules
New products
Should comply with 5.4.1
Should comply with 4.3.1~4.3.5
Quality is engraved on the outside of the product
New products
New products
If any one of the major items in the factory inspection fails, the batch of products shall be judged as unqualified; if any one of the non-major items 5.4.1 and 5.4.7 fails, double sampling re-inspection is allowed. If the re-inspection passes, the batch of products shall be judged as qualified. If there are still unqualified parts after the re-inspection, the unqualified parts in the batch of products shall be replaced and re-inspected. 7.3 Type inspection:
7.3.1 Type inspection should be carried out in the following cases: a) when a new product or old product is transferred to a factory for trial production and type identification; b) after normal production, if there are major changes in structure, materials, and processes that may affect product performance; c) during normal production, it should be carried out once a year; d) when production is resumed after a one-year suspension; e) when the factory inspection results are significantly different from the last type inspection results;1 Type inspection should be carried out in the following cases: a) when a new product or old product is transferred to a new factory for trial production and type identification; b) after normal production, if there are major changes in structure, materials, and processes that may affect product performance; c) during normal production, it should be carried out once a year; d) when production is resumed after one year of suspension; e) when there is a significant difference between the factory inspection result and the last type inspection result; 478
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