Labor Insurance Shoes, Safety Shoes, Various Performance Testing Methods

The European Standard EN 344:1997 "Special Safety, Protection and Work Shoes" was formulated by the Technical Committee of CEN/TC61 "Foot and Leg Protection Products", with BSI as its secretariat. This standard stipulates the structure and performance indexes of safety protective shoes, such as style design, whole shoes, upper, lining, tongue, inner sole and outer sole. The principles of the test methods specified in the standards are also generally applicable to most safety shoes. The main indicators are as follows:

Impact Resistance of 1 Baotou

In the impact test with steel impact hammer of specified weight, the clearance height under the head should be less than the specified value when the head is impacted, and there should be no penetrating cracks in the direction of the test axis. It is noteworthy that the weight, specifications, impact height and the structure of the test machine are different in various national standards, and should be distinguished in actual testing.

2. Piercing resistance

The test machine is equipped with a pressure plate, and the pressure plate is equipped with test nails. The test nail is a cutting-off tip. The hardness of the nail head should be greater than 60HRC. The sole sample is placed on the chassis of the testing machine, where the test nail can be pierced through the outer sole. The test nail pierces the sole at a speed of 10 mm/min (+3 mm/min) until it is pierced.

So far, record the amount of effort required. Four points on each sole were selected for the test (at least one point on the heel). Each point was not less than 30 mm apart, and the distance from the edge of the inner sole was more than 10 mm. The bottom of the anti-skid block should be pierced between the blocks. Two of the four points should be tested within a distance of 10-15 mm from the edge line where the planting bottom corrugates are located. If humidity has an effect on the results, the sole should be immersed in deionized water at 20 2 for 16 1 h before testing.

Electrical properties of conductive shoes and antistatic shoes

After the shoe sample is adjusted in dry and wet atmosphere, the clean steel ball is filled into the shoe and placed on the metal probe device. The resistance between the first two probes and the third probe is measured by the specified resistance measuring instrument. In general, the resistance of conductive shoes should not be greater than l00K ohm; the resistance of antistatic shoes should be between 100K ohm and 100M ohm.

4 thermal insulation performance

The thermocouple is installed in the center of the inner sole connection area and the steel ball is filled in the shoe. Adjust the temperature of the sand bath pot to 150, 5, put the shoe sample on it, make the sand touch the outsole of the shoe, use the temperature measuring device connected with the thermocouple, measure the temperature of the inner sole and the corresponding time, and give the temperature increasing curve. Calculate the temperature increase 30 minutes after the sample is placed on the sand bath. Generally, heat insulating shoes require that the temperature increment of the inner sole surface be less than 22 degrees Celsius.

Energy Absorption Property of 5-heel Part

The large compression load of the test instrument is 6000N, equipped with a device for recording load/deformation characteristics. Place the heeled shoe pattern on a steel plate, and place the test punch on the inner center of the heel part against the inner sole. Load is applied at a speed of 10 mm/min and 3 mm/min. Draw the load/compression curve and calculate the absorbed energy E, expressed in joules.

6 Requirements for Anti-skid Outer Bottom

The standard stipulates testing the anti-skid coefficient of sole, but stipulates the design and specification of anti-skid block, such as the thickness of sole, the height of anti-skid block and the distance from the edge of sole.