Some standard content:
National Standard of the People's Republic of China
General Technical Conditions for Protective Footwear
Modular technical requirements for protective footwear1 Subject content and scope of application
This standard specifies the classification, technical requirements, test methods and markings of protective footwear. This standard applies to protective footwear worn during labor operations. 2 Referenced standards
Test method for moisture permeability of plastics
GB 1037
GB3293 Chinese shoe sizes and shoe plant series
3 Terminology
Heel height: The vertical height from the sub-mouth of the rear end of the shoe to the ground. As shown in Figure 1. 3.1
Outsole thickness
3.2 Outsole thickness: The thickness of the outsole at the forefoot support point. As shown in Figure 1. 3.3 Heel height: The difference between the heel height and the outsole thickness. 3.4 Anti-slip block: The soft convex block or ribbed pattern on the bottom surface of the outsole. Heel height
GB 12623-90
3.5 Anti-slip property of the sole: The anti-slip ability of the sole when walking normally on a smooth and hard road (expressed by the anti-slip coefficient uo). 3.6 Heel cushioning: The energy absorbed by the heel when the heel hits the ground when a person walks normally (expressed in joules). 4 Classification
4.1 Classification by protective performance
4.1.1 Industrial protective shoes (G):
4.1.1.1 Waterproof shoes (GS).
4.1.1.2 Cold-proof shoes (GH).
4.1.1.3 Insulated shoes (GJY).
4.1.1.4 Anti-static shoes (GID).
Approved by the State Administration of Technical Supervision on December 26, 1990, 160
Implemented on October 1, 1991
Conductive shoes (GDD).
Electrically heated shoes (GDR).
Anti-corrosion shoes (GF):
Alkali (GFJ),
Acid (GFS),
Oil (GFY),
Organic solvent (GFR).
Radioactive contamination protection shoes (GWR).
GB 12628-90
Shoes to prevent dust, dirt and general mechanical damage (GCW). 4.1.1.10
4.1. 1. 11
4. 1.1. 12
4. 1. 1. 18
Anti-slip shoes (GHD).
Shockproof shoes (GCD).
Lightweight shoes (GQ).
Dust-free shoes (GWC).
Stab-resistant shoes (GCG).
Forestry safety shoes (L):
Logging shoes (LC)
Flame-retardant shoes for firefighting (LP).
Safety shoes for casting and similar hot work (ZR). 4.1.3
Safety shoes for high-altitude work such as construction (JG). Safety shoes for porters, repairmen, etc. (B). Mining shoes (ZK).
Marking examples
Industrial protective shoes
-Waterproof shoes
Protective shoes GSGB12623
5 Technical requirements
5.1 Outsole
The outsole of protective shoes must have anti-slipper. The base thickness d and the anti-slip block thickness d2 are shown in Figure 2, and their values are not less than the thickness listed in Table 1.
Rubber and plastic, rubber
Microporous materials
G812 Valley #8—90
For example, the outer sole street multi-layer bottom is bonded before the hidden as shown in Figure 3, the base barrier of material B is at least? Ya, the anti-slip block compliance value is not less than the requirements in Table 1, and the minimum is the requirements in Table 2. Wenwen
Yellow, pig moss bzxZ.net
Ice cow leather
5.2 Heel height
Injury Qing, film
Microporous materials
The height of the heel of protective shoes is 20~30m for men and 205xm for men. Shoes
The upper material should be abrasive and have good moisture permeability. When tested according to methods 6 and 3, the moisture permeability of leather shoes and cloth shoes shall not be less than 20m/cm? . 5.4 Anti-slip property of the sole
When tested according to the method in 6.1, the anti-slip coefficient of the shoe shall not be less than 0.15 (simulating the ground with cloth coated with No. 30 industrial lubricant).
For the working ground with high and low hardness and relatively hard but can be protected from nails, anti-slip measures such as making anti-slip spikes on the outsole to match the working ground or laying artificial ground on the working ground can be adopted. , Shoe cushioning
According to the method of testing the shoe cushioning by multiple methods, the shoe size shall not be false. 1.5, Shoe size, shoe size classification, shoe size type marking method shall be implemented in accordance with the provisions of men's shoes and women's shoes in 3323. 5,7 The size of the protective shoe shall be larger and larger than the size corresponding to the wearer's foot length and circumference. 6 Test method
Chain, anti-slip property of sole
If, 1.1 Test conditions
, 1.1, 1 Ambient temperature, normal temperature in the test room. 6.11.2 E pressure 600±10N
8.1.1.3 Simulated maximum sliding speed: 480~550mm/s. .1.2 The horizontal force on the simulated human foot when the simulated human foot wearing the sample shoe contacts the moving surface is measured by the sensor, that is, the sliding friction force of the sample, and the sliding friction coefficient between the sample shoe and the simulated ground is calculated based on it. 182
8.1.8 Samples
GB12623—90
The number shall not be less than 2 pairs of size 25 men's shoes or size 23 women's shoes. For high-top shoes and half-top shoes, cut a height of 60mm above the heel of the outer sole. The sample is placed at room temperature and pressure for 24 hours before the test. 1.4 Test equipment (as shown in the figure).
Simulated human foot axis
1 Simulated ground, 2 Simulated human foot, 3-bracket; 4-sensor, 5 Recording device The simulated ground is a steel plate with a surface roughness that is milled out without cutting in the length direction (the diameter of the milling cutter is above 120mm). The length shall not be less than 450mm, and it can produce a linear reciprocating motion in the horizontal direction with a stroke of about 200mm. Its movement speed changes according to the sine law.
Simulated human foot Its specifications and dimensions are shown in Appendix A. It is required that the heel height can be adjusted within 20 to 35mm, and its weight is positive pressure. b.
The bracket must make the simulated human foot axis coincide with the sensor force measurement axis horizontally. d.
The sensor is a 1000N tension and pressure sensor.
The recording device is an X-Y function recorder.
6.1.5 Test steps
Adjust the test equipment so that the simulated ground moves smoothly and continuously, the center of gravity of the weight tank points vertically to the axis of the simulated human foot, the sensor force measurement axis
is horizontal with the axis of the simulated human foot, and the recording device is in the measuring state. 6
Ground.
Pre-grind the sample shoes on the simulated ground by hand to remove the burrs and impurities on the outsole of the shoes. Use a clean cloth dipped in alcohol to clean the simulated ground and apply distilled water or industrial lubricating oil according to the product standard requirements. Install the sample shoes, start the simulated ground, and record the friction in the horizontal direction. Measure at least three times in a discontinuous manner. The fluctuation range of the waveform on the curve of each measurement value must be less than 4N, otherwise adjust the equipment and test again.
Take the average value of the waveform as the measurement.
6.1.6 Test results
Take the arithmetic average of the similar measurement values measured each time as the measurement result. The coefficient of sliding friction of the sole is calculated according to formula (1): o
where,.
Coefficient of sliding friction,
\Average of measured values, N,
Positive pressure, N.
GB 12623-40
cCalculation result is accurate to the second decimal place. , 2 Heel cushioning
6.2.1 Test conditions
Temperature: 1530℃.
6.2.2 Sample
A pair of men's shoes or women's shoes.
.2.8 Test equipment
. A universal material testing machine with a force of more than 5kN (with a device for recording force and deformation disk) b. A test metal nail with a chamfer of 2mm and a diameter of 40mm, c. Integral instrument with an accuracy of less than 5%.
d. A profile gauge with a front end height of 7 mm and a wedge angle of 13°. 6.2.4 Principle
The test metal nail is uniformly pressed to 5000N at a speed of 10mm/min on the heel of the shoe, and the deformation in the pressure direction is recorded at the same time. The absorbed energy of the heel is calculated by formula (2):
In the formula: E -
Absorbed energy of the heel, I
Downward pressure of the test metal nail, N,
Deformation in the pressure direction, m
Deformation corresponding to 5000N pressure, ma
6.2.5 Test steps
. Adjust the material testing machine to standby mode, select the range, calibrate the force and deformation (2)
b. Place the sample shoe on the testing machine platform, pad the forefoot with a wedge gauge, make the heel form an angle of 13° with the platform, place the test metal nail in the center of the heel hall of the shoe, pressurize 50N to fix the wedge gauge, c. Adjust the zero point of the deformation, and then pressurize at a uniform speed of 10mm/min to 5000N and stop. d. Take down the function relationship curve of recording force and deformation, use the integrator to measure the area enclosed by the curve and the deformation, which is the energy absorbed by the heel of the shoe.
6.2.6 Measurement results
. Test each shoe once, and take the arithmetic mean as the measurement result, b. The measurement error should not be greater than 1J.
6.3 Upper moisture permeability
8.8.1 Principle
Upper moisture permeability is the sum of the moisture absorption value and moisture permeability of the upper per unit area within 8 hours. 6.8.2 Sample
Cut three pieces of upper with a diameter of 34mm from the sample shoes for testing. The sample is required to be wrinkle-free and clean on the surface. 6.8.#Test equipment
Alternate with the GB1037 test equipment.
6.8.4 Test conditions
Temperature: 36±1℃.
Humidity: dry on one side, 100% on the other side.
Air pressure: one standard atmosphere.
6.3.5 Test steps
G 12623-80
The upper moisture permeability is carried out according to the test steps in GB1037. The moisture absorption value of the upper is the difference in mass before and after the test of the sample under the test conditions within 8 hours. b
.3.6 Test results
The moisture permeability Lv [mg/(cm28h)), moisture permeability Qv [mg/(cmz·8h)) and moisture absorption value Wv [mg/(cm28h)] are calculated according to formula (3). The calculation result is accurate to the first decimal place. LyQv+Wy
In the formula,. When the permeability is stable, the arithmetic mean of the weight reduction of the permeability cup per unit time, mghS—test area of the sample, cm2
Am—the difference in mass per unit area of the sample under the test conditions before and after 8h, m/(cm?·8h)7Mark
Each pair of shoes shall be stamped, printed or pasted with a permanent mark containing the content listed in item b on the parts listed in item b. Insole, middle of outsole, upper part of back cover and tongue. ,
Shoe size, manufacturer, year and month of production, license number, mark of this standard and product standard number. b.
GB12628-90
Appendix A
Simulated human foot size specifications
(Supplement)
Simulated human foot must meet the size requirements noted in Figure A1. Simulation
Additional instructions t
This standard is proposed by the Ministry of Labor of the People's Republic of China. 75
Size and Specification of Simulated Human Feet
This standard is under the jurisdiction of the National Technical Committee for Standardization of Labor Protection Products, Hands, Feet and Other Types of Protection Products. This standard was drafted by the Jilin Labor Protection Science Research Institute. The main drafters of this standard are Wang Yongtao, Wang Chunfang and Fan Fujiang. 166
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