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Helmet Basics
Addtime:2010-1-27   Clicks:2876

Operations in the production process, accidents, falling objects hurt operating officer of incidents have occurred. In the construction, mining, metallurgy and petroleum exploration, tunnel engineering, deforestation and other workplace injuries falling objects there occurs the possibility of the accident operating officer. Sudden occurrence of such incidents, less than dodge. Time of the accident, head injuries resulting in death and serious injury are most at risk. Comes under attack head injury may cause concussion, intracranial hemorrhage, meningeal contusion, skull injuries and other serious injuries, helmets causing human dysfunction, ranging from disability, the case can endanger the lives of persons. Thus, in the above workplace personnel must wear helmets.

What is a helmet

On the human head by falling objects, and other specific factors that play protective role in the damage caused by the hat called the helmet. From the cap shell, hat lining, belt and other accessories under the chin composition. Cap shell by shell, visor, brim, top bars etc., helmet hat cap shell lining is the general term for the internal components from the hat hoop, Sweat-absorbent band, lining and cushioning devices with the composition, is tied under the chin with a chin played the role of tape fixed by the composition of the Department of belts and locking card.

First break in an instant impact to the entire area of the skull, and then the use of helmets in various parts: hat helmet shell, helmet liner cap structure, materials, and you set the buffer structure (jack, tie rope, sutures, cushion, etc.) of the elastic deformation, plastic deformation and permitted structural damage to most of the impact force absorption, so that the final effect of the impact force to the staff head down to 4900N below, thus helping protect the operating personnel in the head does not hurt or reduce the harmful effects.

Helmet Categories

Helmets and personal protective equipment to produce a large amount of protective helmets use a wide range of important supplies, one variety of types of helmets are more helmets structure of a variety of forms. By the use of helmets can be divided into classes for the general operations and special operations type two kinds. General operation class has a general impact protection performance helmets for the existence of the impact of workplace injuries, such as construction, shipbuilding operations and so forth. In addition to the special job class has a general impact helmets outside the protective performance also has a special protective properties, with special protection needs for the workplace, such as static protection, the lateral rigidity of protection, fire-retardant protection, temperature protection and so on. Cap based on the shell material can be divided into plastic helmets, glass, steel helmets, glial helmets, bamboo helmet, aluminum helmets and so on, before the four kinds of materials, helmet manufacturers are more production of large, widely the use of aluminum helmets production, use less. Flange dimensions in accordance with the size of the helmet can be divided into non-along, along the small, medium and large along the along. Regardless of helmet materials, structures the differences in the use of helmets in accordance with categories of the technical requirements are the same.

Helmet Material

1. Cap shell material

The cap shell helmets are mainly synthetic resin material, metal, resin and plastic helmets. Helmet hat helmet shell materials, the overall impact on the performance of students must play the role, therefore, should be based on different structural forms of cap shells choose the right material.

Helmet synthetic resin material is a material widely used at home and abroad, of the types there are unsaturated resin, polycarbonate, ABS, high molecular polyethylene, modified polypropylene, the use of these materials have good anti-helmets impact properties, and light weight, looks good quality, with a variety of structural forms samples to choose from.

Helmets metallic materials (such as aluminum alloy) produced by helmets of its impact resistance than plastics and glass, steel helmet, this helmet can not be in a risk of electric shock used at the workplace.

Gelatinous material helmet has good impact resistance, rigidity, heat resistance, corrosion resistance and anti-static nature of underground miners has long been the preferred to use helmets.

Made with bamboo helmet is endemic to China as a material used in the early years more in South China. Bamboo helmets toughness better prepared, with good impact resistance, permeability of the best anti-puncture performance, poor helmet shell at the top of the general increase in the cap plate to enhance its anti-puncture performance. Bamboo helmet impatience burning, can not have the fire source used at the workplace, and the helmet is hand-woven bamboo, quality assurance is not easy. In recent years, the number of China's bamboo helmet less and less.

2. Cap liner material

Helmet cap liner material mainly high and low pressure polyethylene helmet, synthetic fiber, cotton belt. Cap liner material should have good strength and impact resistance, response, and allergic skin without harmful effects, choose the cap liner material should be considered with the hat shell material properties of the coordination and cooperation.


Technical Requirements

Size requirements. Helmet size requirements mainly: cap shell internal size, visor, brim, vertical spacing, horizontal spacing, wearing height, prominence, and ventilation holes. In which the vertical spacing and height to wear helmets, two important size requirements. Vertical spacing is wearing helmets at the time and did not top the highest point and the cap of the axial distance between the shell surface (not including the top bones of the space). Size requirement is 25 mm ~ 50 mm. Height is the helmet worn when wearing helmets at the bottom to the top of the head hoop side cap the highest point of the axial distance. Size requirement is 80 mm ~ 90 mm. The vertical spacing is too small to absorb the impact of a direct impact on performance of helmets, wearing a high degree of wear helmets too small to directly affect the stability of the two failed to require any one would have a direct impact on the overall safety helmets.
Weight. In ensuring the safety of the premise, the more light the better the weight of helmets can reduce the operating personnel wear a long neck caused by fatigue. Small along the Sino-along, roll along the weight of helmets should not be more than 430 g, large along the weight of helmets should not be more than 460 g, the weight of cold-proof helmets should not be more than 690 g (The above requirements do not include the weight of additional components ). Safety performance requirements. Yes, that safety helmets protective properties, including basic performance requirements and specific performance requirements, is to determine whether or not helmets important indicator of qualified products. Helmet standard GB2811-1989 had clearly stated the product should meet the requirements of helmets. These performance requirements that products must meet the target, whether producers, users or marketers should be as a basis to determine whether helmets factory, sale and use.


Qualified logo

State helmet introduced industrial production license management and security identity management. GB2811-89 "helmet" standard is a mandatory implementation of the standards. The production of helmets must pass the department in charge of enterprise systems reviewed and approved, the necessary environmental conditions and facilities, product testing equipment, quality control staff, inspectors, technicians and production personnel, organization of production, quality management and control of capacity, factory inspection capabilities. Production of every batch of product must pass through the sample tests before the factory. Enterprises in its manufactured products should be affixed to the label containing the following information: ① Name and type; ② Company name, address; ③ manufacturer, month and year; ④ factory certification; ⑤ production license signs and numbered tags; ⑥ product the implementation of the standards; ⑦ laws and regulations require tagging content.


With requirements

Based on the State Economic and Trade Commission on March 6, 2000 "issued with Personal Protective Equipment Standard (trial)", Helmet equipped with helmets, the typical type of work involved, including foundry workers, electricians, blast furnace workers, cold workmanship, road work , petroleum drilling workers, mining workers and other 25 typical types of work. Typical types of work for each one there are many similar types of work, such as: electricians have 32 similar types of work, safety helmets, blast furnace workers are 145 similar types of work. Company shall, in accordance with the standard protective supplies standard helmets, operators can also be equipped in accordance with the provisions of these requirements.


Helmet choice

The user in the selection helmets, the helmet should be selected in line with relevant state regulations, marking is complete, have passed the test of the helmet, should check its recent inspection reports. Depending on the protection and to the purpose of selecting different varieties, such as: the use of personnel charged workplaces, should be selected with the electric insulation performance and pass the inspection of the helmet, when operating at low temperature, low-temperature protective helmets should be selected with the performance and test qualified helmets. Otherwise, it can not meet the required protection requirements.


The use and custody of

Incorrect helmet wearing will lead to a shock in the subject no protection against. Helmets, according to statistics from related departments, falling objects, 15% of injury accidents due to improper use of helmets. Therefore, the helmet does not wear a helmet that would enable the head from harm. It should be noted in the course of the following questions:

1. Helmet helmets should be checked before using the appearance of whether there are cracks, bumps marks, uneven wear, cap lining is complete, the structure of cap liner is in a normal state, such as the helmets on the existence of significant deficiencies that affect their performance it should be promptly discarded, so as not to affect the protective effect.

2. Users can not arbitrarily take the helmet on the demolition or add attachments, so as not to affect the protective properties of the original.

3. Users can freely adjust the size of cap liner, which will directly affect the protective performance of helmets, the impact of litter occurs, a result of wearing helmets is not solid extrusion or by direct injury after impact peaked in the wearer.

4. To wear safety helmets when in the use of being sure to wear safety helmets, wearing prison, can not shake, to fasten under the chin belt, regulate the post-hoop to prevent the helmet off.

5. Can not be secretly in the helmet on the hole, do not randomly crash helmets, safety helmets when not to ride the bench, as well as to avoid affecting its strength.

6. Having received an impact or did tests helmets should be scrapped, can no longer continue to be used.

7. Helmets can not have acid, alkali or chemical reagent stored in a polluted environment can not be placed in the high temperatures, sunlight, or damp places, to avoid deterioration of its aging.

8. It should be noted the use of helmets in the validity of safety helmets, safety helmets, woven twigs valid for 2 years, plastic helmets will be valid for two and a half years, glass and steel (including PVA steel) and glial helmet are valid for three and a half years , over the period of helmets should be scrapped.
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