Safety helmet grading? What are the national standards for safety helmets? Do you know all about it?

If you want to ensure the safety of work, the hard hat is an indispensable equipment. It can effectively prevent the head from being hurt by impact objects and protect the life safety of staff. The composition of the safety hat mainly includes the hat shell, the hat lining, the jaw belt and the back hoop. The cap shell adopts a strong, smooth and elastic hemispherical design, which can withstand the impact and puncture kinetic energy of the impact object, while the cap lining leaves a certain space between the cap shell and the cap, which can buffer and disperse the instantaneous impact force, avoid or reduce the direct injury to the head. In addition, the basic technical performance of the helmet such as impact absorption performance, puncture resistance, lateral rigidity, electrical insulation and flame retardant can not be ignored. Let's understand and use the safety helmet together to ensure the safety and smooth progress of work.
1. The characteristics of the helmet
Lightweight low hazard safety helmet with good air permeability. Well-ventilated and lightweight, offering total comfort to the wearer.
2. Main structure of safety helmet
Cap shell: Takes the blow and separates the falling object from the human body.
Cap band: Keeps the helmet in a fixed position on the head.
Top band: Disperse the impact force, keep the cap shell floating, in order to disperse the impact force.
Rear hoop: locking device for head hoop.
Jaw strap: assists in maintaining the condition and position of the helmet.
Sweatbands: Absorb sweat.
Cushion: In case of impact, reduce the impact force.
3. Safety helmet specifications
Vertical spacing: measured according to the specified conditions, its value should be between 25-50mm.
Horizontal spacing: measured according to the specified conditions, its value should be between 5-20mm.
Wear height: measured according to the specified conditions, its value should be between 80-90mm.
Cap hoop size: divided into the following three numbers: small: 51-56cm medium: 57-60cm large: 61-64cm
Weight: A complete helmet, the weight should be reduced as much as possible, should not exceed 400G.
 The inclination of the hat should be 20°-60°.
Air holes: Air holes can be provided on both sides of the safety hat.
Bill: minimum 10mm, maximum 55mm.
Color: The color of the hard hat is generally light or eye-catching color, such as white, light yellow, etc.
4. The main role of the safety helmet
Wearing a helmet is mainly to protect the head from injury, it can protect the person's head from injury or reduce the degree of head injury in the following cases:
When a falling object hits the head.
When a worker falls from a height.
When there is a risk of electric shock to the head.
When walking or working in low Spaces, the head is likely to collide with sharp, hard objects.
5. Helmet color classification
1 White: Those with white helmets are generally supervisors or Party A, and supervisors are what we think of as site managers, generally middle-level staff of the project, mainly responsible for the implementation of the site plan and project quality.
2 Red: Red helmets are generally worn by technical personnel, management personnel or Party A. The group of people wearing red hard hats is relatively complex, but generally can be divided into two categories: technical staff and middle and lower management.
3 Blue: Those with blue helmets are generally technical personnel. Red helmet and blue helmet according to the different enterprises, the choice is also different, in short, most of the technical personnel wear.
4 Yellow: Yellow helmets are the most common, so far, the average worker at the construction site in China wears a yellow helmet.
6. Safety helmet use specifications
Before wearing the helmet, the tightness of the helmet should be adjusted, the jaw strap should be tightened, and the helmet is fixed on the head and cannot be freely moved as the standard.
The lower jaw is turned over on the top of the hat, the lower jaw belt is not tied, the lower jaw belt is put into the safety hat, the lower jaw belt is not tied tightly... These are the wrong ways to wear them. In addition to wearing the wrong helmet, the use of damaged, expired helmets, is also unsafe behavior!
The correct use of helmets should pay attention to the following matters:
1. Before wearing the helmet, the cap should be adjusted to a suitable position according to its head type, and then the elastic belt inside the cap should be fastened. The tightness of the cushion is adjusted by the strap, and the vertical distance between the top of the head and the top of the cap body is generally between 25 and 50mm, at least not less than 32mm. In this way, when the impact is suffered, the cap body has enough space for buffering, and it is also conducive to the ventilation between the head and the cap body.
2, do not put the helmet crooked, do not wear the hat behind the head. Otherwise, it will reduce the protective effect of the helmet on the impact.
3. The lower tie of the helmet must be buckled under the jaw, and tied firmly, and the tightness should be moderate. This will not be blown off by strong winds, or be knocked off by other obstacles, or due to the head swinging back and forth, so that the helmet falls off.
4, the top of the safety hat body in addition to the hat lining installed inside the hat body, some also opened a small hole ventilation. However, do not open holes in order to breathe freely when using. Because doing so will reduce the strength of the cap.
5, because the helmet in the process of use, will gradually damage. Therefore, it is necessary to check regularly, check whether there are cracks, depressions, cracks and wear, and replace them immediately when abnormal phenomena are found, and they are not allowed to continue using them. Any hard-hit, cracked helmet, regardless of whether there is damage, should be scrapped.
6, it is strictly prohibited to use only the mandibular belt and the helmet shell connected to the helmet, that is, the helmet without buffer layer.
7, construction personnel in the field operation, shall not take off the helmet, set aside, or as a cushion.
8, because the safety helmet is mostly made of high-density low-pressure polyethylene plastic, with the nature of hardening and change. So it is not easy to stay in the sun for a long time.
9, the new collar helmet, first check whether there is a labor department to allow the production of the certificate and product certification, and then see whether the damage, uneven thickness, buffer layer and adjustment belt and elastic belt is complete and effective. Immediate replacement if not in conformity with the specified requirements.
10, in the field of indoor work should also wear a safety helmet, especially in the indoor live work, but also carefully wear a safety helmet, because the safety helmet can not only prevent collision, but also play an insulation role.
11, usually use the helmet should be kept clean, can not contact the fire source, do not paint arbitrarily, do not sit when the stool, to prevent loss. If lost or damaged, it must be replaced or replaced immediately. No one is allowed to enter the construction site without a safety helmet.
7. Problems that should be paid attention to during use
1, before use, should check the appearance of the helmet whether there are cracks, bruises and bumps, bumps and dents, wear, the hat lining is complete, the structure of the hat lining is in normal condition, if there are obvious defects affecting its performance on the helmet is scrapped in time, so as not to affect the protective effect.
2, the user can not disassemble or add accessories on the safety hat at will, so as not to affect its original protective performance.
3, the user can not adjust the size of the hat lining, which will directly affect the protective performance of the safety hat, once the impact occurs, the safety hat will be worn because of improper release or due to the impact of the top directly hurt the wearer.
4, the wearer must wear the helmet when using, wearing firmly, can not shake, to tighten the jaw strap, adjust the back hoop to prevent the helmet from falling off.
5, can not privately punch holes in the helmet injury, do not crash the helmet at will, do not take the helmet as a bench, so as not to affect its strength.
6. Helmets that have undergone a shock or been tested should be scrapped and cannot be used again.
7, safety hat can not be stored in an environment polluted by acid, alkali or chemical reagents, can not be placed in high temperature, sun or damp places, so as to avoid its aging deterioration.
8, should pay attention to the use of helmets within the validity period, the plant branch woven helmet is valid for 2 years, the plastic helmet is valid for 2 and a half years, glass steel (including Vinylon steel) and rubber helmet is valid for 3 and a half years, more than the validity of the helmet should be scrapped.
9, safety hats should be selected in line with national standards, through the ISO quality system certification and mandatory product certification of quality products.
10, the helmet to prevent falling objects hurt people, and the helmet is used to prevent impact, fall, the two protection points are different, the function of each focus, so can not be replaced. Entering the production site must wear a hard hat, taking off the hard hat at will is illegal, when the stool is used, it will cause damage to the hard hat or reduce the service life.
11, the combined temperature of the helmet is -10 to +50 ° C, should be placed in a ventilated dry place, and avoid contact with fire (heat) sources and corrosive substances, so as not to affect its normal use.