GB/T 2812-2024 Head protection - General test methods
1 Scope
This document describes the pretreatment, headform, test environment and test methods of head protection equipment.
This document is applicable to the testing of head protection equipment used in industrial sectors, rescue (including production safety accidents in industrial, mining, commercial and trade enterprises, road traffic accidents, natural disaster accidents), and related industries.
This document is not applicable to the testing of head protection equipment used in commuting, sports, fire fighting and rescue.
2 Normative references
None.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
basic plane
plane passing through the center of left/right porus acusticus externus and the lower edge of eye sockets of the testing headform
[Source: GB 811-2022, 3.10]
3.2
reference plane
plane parallel to the basic plane at a certain distance above it
[Source: GB 811-2022, 3.11]
3.3
vertical median plane
longitudinal plane passing through the apex of the testing headform, vertical to the basic plane, and dividing the testing headform into two symmetrical parts
[Source: GB 811-2022, 3.12]
3.4
headforms
headforms simulating the geometric profile and mechanical property of human head when inspecting the head protection equipment
4 Headforms
4.1 Impact test headform
4.1.1 The mass of a headform and its connecting parts is 5.0 kg ± 0.1 kg.
4.1.2 There are1# and 2# headforms, materials, structures and dimensions of which shall meet the requirements of Annex A.
4.2 Retention test headform
4.2.1 The retention test headform shall be a full headform including the lower jaw, with smooth surface.
4.2.2 The headforms are divided into five models: A, E, J, M and O. The corresponding head circumference, basic plane and reference plane positions of each model shall be as specified in Table 1.
4.2.3 The shape and size of the headform above the reference plane of the full headform shall meet the requirements of Annex B.
4.2.4 The shape and size of the headform below the reference plane of the full headform shall meet the requirements of Annex C.
Table 1 Headform size, mass, and position of basic plane and related planes
4.3 Acceleration test headform
4.3.1 The headform is a half headform made of magnesium-aluminum alloy, with a smooth surface and a frequency response below 2,000 Hz.
4.3.2 The headforms are divided into five models: A, E, J, M and O. The corresponding head circumference, basic plane and reference plane positions of each model shall be as specified in Table 1.
4.3.3 An acceleration sensor is installed at the center of gravity of the headform. The mass of the sensor is less than or equal to 50 g, and the mass of the connector is less than or equal to 1,200 g.
4.3.4 The shape and size of the headform above the reference plane of the impact acceleration headform shall meet the requirements of Annex B.
4.4 Selection of headforms
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Headforms 4.1 Impact test headform 4.2 Retention test headform 4.3 Acceleration test headform 4.4 Selection of headforms 5 Pretreatment 5.1 Temperature pretreatment 5.2 Ultraviolet irradiation pretreatment 5.3 Anti-static property pretreatment 6 Test environment 7 Test methods 7.1 Structure and dimension test 7.2 Mass test 7.3 Test of field of view 7.4 Retention stability test 7.5 Dynamic strength test of retention system 7.6 Strength test of chin strap 7.7 Impact absorption performance test 7.8 Impact acceleration performance test 7.9 Penetration resistance test 7.10 Lateral rigidity test 7.11 Flame resistance test 7.12 Electrical insulation property test 7.13 Anti-static property test 7.14 Chemical resistance test 7.15 Ultra-low temperature resistance test 7.16 Ultra-high temperature resistance test 7.17 Test of resistance of small splashes of molten metal Annex A (Normative) Technical requirements for impact test headform A.1 Structure and material of headforms A.2 Height and dimensions of headform layers A.3 Verification of headform dimension Annex B (Normative) Headform shape and dimensions above the reference plane Annex C (Normative) Headform shape and dimensions below the reference plane Bibliography
