Safety Shoes With The Protection Of The Feet And Legs
Safety shoes are safety class shoes and protective shoes collectively, generally refers to the different workplace wear with the protection of the feet and legs from the foreseeable damage to the footwear. Safety shoes are high-tech and high value-added footwear products, safety shoes production process of raw materials, accessories, chemical materials, machinery and equipment requirements are very high, the current domestic many have a certain size and grade of footwear Enterprises have to look to the security shoes this has been occupied by the developed countries in the past market areas. Xiao Bian collected some of the international standards on safety shoes, I believe interested friends will like.
The standard of the safety shoes design, the whole shoe, to help face, shoes, tongue, insole, outsole and other structural and performance indicators were provided. Standards in the project test methods and other similar standards similar to its principle is also generally applicable to most of the safety shoes, the main indicators are:
A. Baot head impact resistance with a specified weight of steel impact hammer impact test, Baotou by the impact of the head under the gap height should be less than the specified value, and Baotou in the direction of the test axis should not appear any penetrating cracks. It is noteworthy that the provisions of national standards on the weight of the hammer, specifications, impact height and the structure of the test machine and other provisions are different, the actual test should be distinguished.
B. Anti-piercing performance test machine is equipped with a pressure plate, the pressure plate is equipped with test nails, test nail for a cut off the tip of the head, the hardness of the head should be greater than 60HRC. Place the sole sample on the test machine's chassis and allow the test nail to pierce through the outsole. The test nail pierces the sole at a speed of 10mm / min ± 3mm / min until it is penetrated. force. Each point on the soles of the four points to test (of which at least one point in the heel), each point is not less than 30mm, and from the bottom edge of the distance greater than 10mm. There is the end of the anti-sliders, should be punctured between the blocks. 4 points in the four points should be tested at a distance of 10-15 mm from the edge of the plant edge. If the humidity will have an impact on the results before the test should be immersed in the soles of 20 ℃ ± 2 ℃ in deionized water 16 ± 1h.
c. Electrical properties of conductive and anti-static shoes After the shoes are adjusted in a dry and wet atmosphere, fill the inside of the shoe with a clean steel ball and place it on a metal probe device. Use the specified resistance test instrument to measure The resistance between the front two probes and the third probe. Under normal circumstances,Safety shoes the conductive shoe resistance should not be greater than l00K ohm; anti-static shoes require resistance should be between 100K ohm to 100M ohm.
D. Insulation performance to shoes as a sample, the thermocouple installed in the center of the inland junction area, and the ball into the shoes. Adjust the temperature of the sand bath to 150 ℃ ± 5 ℃, the shoe on it, so that the sand exposed to the outsole, the use of thermocouple connected with the temperature test device to determine the temperature and the end of the corresponding time ,Safety shoes Gives the temperature increase curve. Calculate the increased temperature from the sample to the bath after 30 minutes. General insulation shoes require the inner surface of the temperature increase of less than 22 ℃
E. Heater Absorbability Test The maximum compression load of the instrument is 6000N, equipped with a recording load / deformation characteristic. The shoe is placed on a steel plate and the test punch is pressed against the inside of the center of the heel portion. The load was applied at a speed of 10 mm / min 3 mm / min. Draw the load / compression curve and calculate the absorbed energy E, expressed in joules.
F. Requirements for non-slip outsole This standard specifies the anti-slip coefficient of the sole, but provides for the design, specifications, etc. of the anti-skid,Safety shoes such as the sole thickness, the height of the anti-skid, the distance from the edge of the sole.