What is the principle of aircraft life jacket

life jackets are generally divided into two types: inflatable life jackets and foam -type life jackets.

1. Foam -type life jacket refers to the fabric made of nylon or dendrome rubber. It is filled with buoyancy materials such as foam boards in the middle. It has enough buoyancy to wear on the body so that the head of the water drop can expose the water.Generally, what we use belongs to the sea life jacket.It uses EVA foaming material inside, which has been compressed by 3D three -dimensional forming. Its thickness is about 4 cm (domestic products are 5-6 thin hair materials, which is about 5-7 cm thick).The life jackets produced according to the standard specifications have its buoyancy standards: Generally, it is 7.5 kg/24 hours, and children are 5 kg/24 hours, so as to ensure that the surface of the chest is paid above the chest.

2. The inflatable life jacket is divided into two types: automatic inflatable life jacket and manual inflatable life jacket. This kind of life jacket is made of high -intensity Waterproof material. The inflatable life jacket is mainly sealing inflatable vest airbags, micro -pressure gas cylinders and fast -moving air cylinders and fast.The composition of the inflatable valve is often used in the possibility of falling into the water.

Under normal circumstances (not inflatable), the entire inflatable life jacket is Hanging on the back of the shoulder like a strap. Because the volume is small, it does not hinder people's homework.At all times, or automatically expand and inflatable (automatic inflatable life jacket) according to the action of water, or by pulling a cable (manual inflatable life jacket) on the man-charged air valve, it can be inflated into 8-15 kg of buoyancy within 5 seconds.Safe clothes; life jackets hold up the human body upward, so that the head and shoulders are exposed to the surface, so as to obtain safety protection in time.

This kind of life jacket is made of water -resistant and breathable materials on the surface. In addition to paying attention to its buoyancy when choosing, it should also be noted that sharp objects can be avoided or worn through the waterproof layer.Inflatable life jackets should check if they are leaking before use.

What are the use of aviation life jackets

Many friends may think that the plane is safe. If there is an accident, there is no parachute effect. In fact, once an accident occurs, it is completely unrealistic for passengers to escape from parachute.

1. Civil aircraft is not the same as fighters. The engine is next to the cabin door. After parachuting, it is easy to get rolled into the engine, so it is more dangerous to say.

2. The skydiving looks very simple, but in fact, even professional paratroopers have to be trained for 3 months before parachuting. Passengers who have not trained have a greater risk of parachute.

3. Therefore, compared with parachutes, life jackets are more practical. In addition, even if the plane encounters an accident, it can be controlled. The pilot can still control the emergency landing of the plane. The forced landing may land in the lake., River and the sea, at this time, life jackets can play a role.

4. Aviation life jackets also have a certain warmth function. After the cold, the weather can also provide passengers with a temporary cold protection effect.

5. The color of the life jacket is bright, and the rescue personnel can be reminded from a long distance during rescue.

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What is the material of the life jacket

Life -saving fabric

1. Special nylon material

This kind of fabric is relatively low in price, wide use, but not durable

2. Neoprene choprene rubber (diving material)

This kind of fabric is more expensive, feel soft and comfortable, friction, as long as high -end life jackets can use this fabric.

Life -saving clothing

1. Polyethylene foam plastic

The price of this linoleum is relatively low, with sufficient buoyancy and wide use surface, but the buoyant of the buoyance will change with the time of soaking in the water at about 5%.

2. EPE pearl cotton

The price of this linoleum is obviously more expensive than the foam plastic, and its advantages are obvious.The buoyancy is strong, the life jacket is easy to fold, and it is easy to dry. More importantly, the buoyancy is soaked in the water for a long time.

Life clothing material requirements

1. Plastic should be a soft -closed foam plastic. During the validity period, it is not affected by the erosion of seawater, oil or mold and affects its normal use.It can be stored within the temperature range of -30C to 65C (243 ~ 338K) without damage. It can maintain its performance within the water temperature range of -1c to 30C (272 ~ 303K).

2. Rich kapok oil and must not contain other impurities. The physical properties and moisture content should meet the requirements of norms.After being surrounded by hydrocarbon flames for 2 seconds, the source of the fire should not be burned.Between the kapok and the raw clothing cloth of the kapok life jacket, there must be a waterproof inner cover made of rubber or other waterproof materials.

What is the role of life jacket

1. Help people float on the water

Putting on a life jacket allows people who can't swim to keep their heads exposed to water, thereby reducing the probability of drowning.For those who can swim, the buoyancy of life jackets can save them more physical strength.

2. Cold protection and warmth

Most of the life jackets are made of foam plastic. In the cold water, it can effectively keep warm and reduce the loss of human heat.

3. increase the rescue rate

life jackets are generally bright in color and have anti -light strips, which are convenient to be discovered.At the same time, many life jackets and survival whistle can help people send a distress signal without physical saving.

4. increase the survival rate

Safe clothes can help people float on the surface, which greatly reduces the probability of drowning.At the same time, many life jackets are also equipped with first -aid Bags, which can help people survive better in the harsh living environment.

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What is a sight

The origin or optical aiming device is difficult to verify.It is said that at least in the 16th century Europe, some people have tried to fix the glasses lens on the butt.There are text records that before the 19th century, the firearm had a long -mirror -type aiming device, which could be used for aiming under low light conditions.The scope can be divided into holographic scope, internal red and green scope, and laser sight.

Blame classification

The scope is mainly divided into the following three categories: the long -term scope, the precipitation scope, and the reflective sight.Among them, the Wangyuan sight and reflective sight are the most popular.The above two types of sights are mainly used during the day, so they are collectively referred to as the white light scope. In addition, there are night vision sights for night aiming (adding night vision devices to the above two types of sights, and night vision device according to night vision deviceThe types of types can be divided into micr -light sights, infrared sights (can also be subdivided into two types: active infrared and thermal imaging).

What is the principle of the scope

The scope has both enlarged function and the function of fast aiming.Natural light is absorbed from a optical fiber -made lighting system at the top of the aiming mirror, and a targeting mark is formed by a split plate and then reflected into the eyes of the shooter.

Both the bullets and the sight can be seen as a ray approximately. Two rays located in the same plane and in one direction are either parallel or intersection. In fact, the point in the scope is exactly the ray of the scope and the ray of the bullet.The intersection, the parabolic line of the bullet and the sight line have two focus, as well as the target sight.

The intersection of the scope of the scope and the ray of the bullet may not necessarily fall on the target. This requires adjusting the distance between the scope of the scope and the intersection of the ray of the bullet.In order to adjust, the viewing angle of the sight installation is needed according to the target distance.If you want to make precise shooting, you need to consider the impact of the wind direction, which is the so -called repair.

Is the scope a prohibited product?

At present, it is not included in the category of prohibited products. The sight can be regarded as a collection of things, such as the sights replaced by the collection equipment, which is normal.

The scope generally does not belong to a prohibited item. The criterion for measuring the non -committing is whether there is any harm to others and whether it harms others and national interests.The scope is not a military weapon, not to mention that ordinary sights are only attributed to toys (unable to compare with military regulations).

There is also the purpose of this sight. If it is used to sin or harm the interests of others, of course, if not, it is just a normal Tool.

Is there a life limit for life jacket?

The life jacket has a limited use period. If it continues to be used more than the period of use, the effect of life jacket will be greatly reduced. Generally speaking, the life of the life jacket is as follows:

1. The use of buoyancy materials to fill the life jacket is 5-7 years, and the storage period is 10 years.

2. The use of inflatable life jackets is 3 years, and the storage period is 8 years.

Life -care clothing maintenance method

1. Make sure that life jackets are worn correctly.

2. The life jacket needs to be stored in a clean, cool and dry place.

3. If the life jacket is humid or rainy, it cannot be dried directly under the sun, and it should be dried in a cool place.

4. Wash the life jackets regularly with fresh water, especially the life jackets have been used in the seawater environment.

5. cleaning life jackets are generally used in water and mild detergent. They cannot be used for washing machines.

6. The life jacket that is not used cannot be used as a cushion or other use. This will cause damage and cannot move the life jacket through the mouth blowing Tube.

7. If the life jacket is impacted by a special load when wearing, the life jacket should be returned to the factory for inspection.

8. When wearing a life jacket, avoid the contact of sharp objects, especially the inflatable life jacket, otherwise it will break the surface of the life jacket and affect the effect of the life jacket.

9. Safe clothes should avoid contact with corrosive solutions, otherwise the internal and external materials of the life jacket will easily damage the inner and outer materials of the life jacket.

10. If it is an inflatable life jacket, check the inflatable tank regularly to ensure that it is in a normal usage.In case of leakage or decreased pressure, maintenance should be performed.

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How to buy a life jacket

1. Look at the fabric

There are generally two types of life -saving fabrics, one: special nylon material, which is relatively low in price and wide use, but not durable; the other is: neoprene choppen rubber (diving material)., Feel soft and comfortable, friction, as long as high -end life jackets can use this fabric.

2. Look at accessories

There are two types of life jacket accessories. One is the survival whistle. This is basically standard for life jackets. The other is reflector. If it is operating at sea and the visibility is low, we are strongly recommended to standard.If it is generally playing leisure and entertainment, it is generally not worthy.The life jackets of Big fish also attach many functions, such as pockets, fish tongs, sub -pockets, and so on.However, some of the life jackets are required. No matter how the style changes, these are not missing. This is the life pocket and insurance Belt (through the Belt connected to the front film from the back of the life jacket).

3. Look at buoyancy

The buoyancy of life -saving clothing should meet the prescribed standards (continuous soaking in seawater for 24 hours of buoyancy should not be less than 0.75 kg. The front and rear pieces of life jackets must have the correct proportion.The buoyancy is regarded as 1, and the buoyancy of the front film should be greater than 0.58).However, the buoyancy will change as the buoyant time in the water will change at about 5%.. Strong buoyancy, folding is convenient to collect in life jackets, and it is easy to dry. More importantly, the buoyancy is soaked in the water for a long time, and the cutting force is significantly reduced significantly.

4. Look at the reinforcement situation

Two methods are commonly used for life jackets.The first: rope, this kind of life jacket is generally a low -suspected life jacket.This is used in early life jackets.The second is zipper buckle. This kind of life jacket is the most widely used now.

5. Look at the color

In order to find the water falling in the sea, the color of the fabric of the general life jacket is more bright colors, and the reflex board is installed on the shoulders of the life jacket. Pay attention when buying.

The above is how to buy the answer to life jackets. Regarding these five major points, I hope everyone can understand it in detail and better apply it to actual life. At the same time, I hope that everyone can pay attention to personal safety and not easily get off the water.

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