1. What are the factors that affect the waterproof performance of street lights

1. Ultraviolet

Ultraviolet rays have damaged effects on the insulating layer of the wires, shell protection coatings, plastic parts, sealing glue, sealing rubber strips, and adhesives exposed to the street lights.

After the insulation layer of the wire is cracked, the water vapor will penetrate the inside of the lamp through the gap of the wire core.After the lamp shell is coated with aging, the coating of the edge of the shell will crack or strip, and there will be gaps.After the adhesive gum aging between the electronic sealing collagen, the sealing glue strip, and the structural parts, the adhesion, deformation, cracking, and the gap will also be reduced in order to reduce the waterproof performance.

2. High and low temperature

The temperature of the Outdoor daily changes greatly. The surface temperature of the summer lamps during the summer can rise to 50-60 C, and it will fall to 10-20 C in the evening. The temperature of the ice and snow in winter can be reduced to zero, and the temperature difference between the year will change greater.Under the high temperature environment of Outdoor street lights, materials will accelerate aging and deformation.When the temperature drops to zero, the plastic parts become crispy, and it may crack under the pressure of cold air.

3. Hot expansion and contraction

The shell of the outdoor lamps will cause thermal expansion and contraction due to changes in temperature. The lineflation coefficients of different materials will be different. The two materials of glass and aluminum profiles will displacement at the combination.The process of thermal expansion and contraction is continuously repeated, relative displacement is repeated, and the air density of the lamp is greatly damaged, the gas density is poor, and the waterproof performance is greatly reduced.

2. How to deal with Outdoor street lights and waterproof

At present, Outdoor street lights are mainly divided into two major directions: structural waterproof and material waterproof. Structural waterproof is to improve the structural protection performance of the lamp body and enable it to cope with the harsh Outdoor environment.The position of glue density electrical components is used to prevent waterproof with glue material during assembly.The treatment method of Outdoor street light waterproof treatment is specifically:

1. waterproof waterproof at the imported line hole

The entry and exit line of Outdoor street lights is the easiest place to enter the water. Therefore, the screws and nuts of this part must be tightened in place. The entry and exit cable cannot be easily pulled out. You can use the Gaza Belt, glue and other methods to be fixed.If the lamp is buried underground or in water, then it is allocated at the bottom. The occasions used are that the lamp body is more infiltrated by water, and the import line must be increased.

2. glass splitting waterproof

If there is a glass rubber ring, first fix the groove of the tank or rely on the edge of the lamp body or the light in the lamp to play a small amount of uniform waterproof glue to increase the squeezing and sealing of the rubber ring when the tightness is tightly locked;If there is no glass rubber ring, first in the glass gum, the waterproof glue is placed obliquely.

3. Cover the glue ring to fight screw waterproof

First consider the fixed rubber ring. Generally, the lamp body has no glue groove. The thickness of the rubber ring and the side of the screw hole is fixed first; if the lamp body has a glue groove, first play a small amount of glue in a circle in a circle.Fix the rubber ring first; for the lamp body with waterproof structural waterproof, it is also necessary to evenly beat some glue on the surface and side of the tape.

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[sunscreen fabric ingredients] Which fabrics are good for sunscreen clothing, which are good for sunscreen clothes.

Which fabrics are good for sunscreen clothes?

sunscreen effect

The Sun protection effect depends on two aspects, one issunscreenThe density of the material is also the light transmittance of itself. The sunscreen with a large light transmission will not be better.

sunscreen test

In the chemical laboratory's sunscreen test of each cloth, the main test of 290-400 nanometer ultraviolet rays. The experimental results: the transmission rate of 310 nanometer ultraviolet rays is 19%of Tiansi, 12.4%of Niste Textiles, and cotton 9%, DuPont's rainfall fabric is 8.3%, and the metal silk cloth is 5.3%. The smaller the passing rate, the better the Sun protection effect, but the good white coat worn by the laboratory teachers, the UV -rays are only 1.9%.

General fabric of sunscreen

The first is color cotton fabric clothes, which are the largest isolation rates of blue, red, blue, and green.

The second is sunscreen fabric. This kind of production principle is very simple. In fact, the sunscreen auxiliary agent is added to the fabric.Some.

The third is special fabric clothes, such as silver reflective materials.

Which fabrics are good for sunscreen clothes?

sunscreen polyester fiber fabric

The sunscreen jacket is mainly made of polyester fiber material. The sunscreen auxiliary fabric is added to the fabric to increase the sunscreen surface to face the reflection and scattering effect of ultraviolet rays, and it can not allow ultraviolet rays to damage human Skin through fabrics.

sunscreen polyester fabric

In fact, polyester is the product name of polyester fiber fabrics in my country. The advantages of polyester are strong and durable, good, not easy to deform, corrosion resistance, insulation, stiffness, easy washing and dry.

[Choice of children's sleeping bag] What kind of good Baby sleeping bag is better for the baby's sleeping bag

8 details of choosing a sleeping bag

1. The size of the sleeping bag:The sleeping bag must be loose, and the length and width of the sleeping bag must be sufficient. Do not prevent the child's limbs development.

2. Material of Sleeping bags:Best Martin experts suggest that it is best to choose a cotton sleeping bag, so that the breathability is better.And will not have any stimulation and allergies to the baby's Skin.The most popular is pure cotton -style Sleeping bags.The cotton and Sleeve sleeping bag will have a sense of restraint for the baby. It is best to choose a thin and warm sleeping bag.

3. sleeping bag color:Considering the unsafe factors in fabric printing and dyeing, it is recommended that you choose a white or light monochrome -lining sleeping bag.Selecting environmental protection dyes should also be selected to avoid unnecessary pollution as much as possible.

4. The smell of sleeping bag:Don't forget this when buying a sleeping bag!Smell the smell of Sleeping bags. If you feel pungent, strange (including fragrance), it is recommended that you give up your purchase, and you should not use it even if you send you.This type of sleeping bag is either a problem in printing and dyeing or a problem with filling.Safety first!

5. sleeping bag workmanship:Parents should pay attention to the stitching of Sleeping bags. If there is a problem, they may wrap their children's fingers and toes. If there is an open line, it is not safe to insert a small hand and small feet in the child.

6. The neckline of sleeping bag:Babies should pay more attention to safety when sleeping in Sleeping bags. Do not let the child's head be covered in the sleeping bag.Therefore, when choosing a sleeping bag, you must not have a sleeping bag with too large necklines to avoid children's small heads into the inside of the sleeping bag.

7. Number of Sleeping bags:Prepare 2 to 3 for the baby.Most mothers are willing to bring the baby to the baby at night. There are few opportunities for the baby's urine bed, so there are 2 exchanges.If your baby is only a few months old, I suggest you choose to use a quilting and vest sleeping bag.

8. sleeping bag cleaning:No matter what kind of sleeping bag you choose, for the health of your baby, it is recommended that you wash your sleeping bag first after buying it home, and then use it to dry it and then use it for your baby.

Do you want to wear clothes in the sleeping bag?

If you are afraid of your baby cold, you can touch your baby's little feet and see if it is cold.If your little feet are cold, you can add a thin quilt to his sleeping bag.But do not let the baby sleep too much, sweating can easily cause him to catch a cold.

Choose a split -leg sleeping bag or a sleeping bag?

1. Choose a small -legged sleeping bag (it is recommended to be less than 80cm height)

The newborn has just left the warm mother and came to this strange world. It can not be fully adapted at once. It needs more sense of security. The sleeping bag of the legs can create a sleeping environment like mothers' warm arms. At the same time, it provides a loose to the baby.A comfortable activity space is very helpful for the child's kicking the quilt

2. Older choice to split leg Sleeping bags (it is recommended to be above 80cm or more)

When the baby can turn over, crawl, or walk, he starts to become more and more curious about the world. He hopes to feel the world with his hands, feet, and body. At this time, it is recommended that the mother should not put the baby in a sleeping bag!Sleeping bags with legs are designed for big baby, which is more suitable for babies who can walk independently and stand up.

1. What does Fish drift self -weight mean?

Fish drifting is a float. It is a commonly used Fishing gear for fishing. When choosing Fish drift, the self -respect is an important reference factor.Generally speaking, the weight of the Fish drift is closely related to its production material. Even if the two floats grow the same, the weight of its own material will be different because of the different materials.

Second, the float is great or good

The floating material is different, and the self -weight will be different.

During fishing, floats, fish lines, and lead pendants are a whole. The floating side is light, the lead falls on the end, the floating side is heavy, the lead pendant will be lighter, so the Fish drifting is significant and the self -weight is small.Each advantage:

1. The float is small, light, and more sensitive, but the jumping is high at the time of exit, because the fish bites the lead pendant. Because the float loses the weight, the lighter the float will rise, the more exaggerated.

2. The float is significant. The quality of floats, fish lines, and lead pendants is more uniform, and signal conduction will be better.In addition, there are many places such as the reservoir, and there are storms, which are more stable inserted in the water from major floats.

Generally speaking, the floating drifting is great or small. It is mainly determined by the type of fishing target. When fishing small fish, it is very good to eat lead and eat large fish when fishing.In the slowest position of quiet water and water flow, drift self -weight can be larger than eating lead. However, in the rushing waters in the water flow, even the water is very serious, and the drifting self -weight is less than the lead eating.

Third, the more sensitive to fishing, the lighter the self -weight, the more sensitive?

The sensitivity of Fishing floats is more concerned about fishermen. Many fishermen have heard of the saying that the fish drifts more and more sensitive. Is this true?

It is understood that in the same circumstances of the same situation, the more the Fish drift, the more sensitive it is. There are two reasons:

1. It can be roughly considered that the amount of lead in eating = floating body buoyant-floating self-weight.If you want to keep the amount of lead, then the floating floats must be increased by major floats, and the floating buoyant is proportional to the volume of the float.Therefore, the volume of major floats is inevitable.In the case of the same thickness of the drift tail, considering that the floating drift is exercised in the water, the water resistance is mainly related to the rough and thickness of the float (where the friction resistance generated by the floating surface area is ignored), then, the greater the body strength, the largest body of the float, the largest body of the floatThe larger the diameter, the greater the water resistance during floating exercise, resulting in a decrease in floating sensitivity.

2. According to Newton's first and second laws, the floating drifting through the line group, which is attracted by the fish to eat the mouth, changes the still inertia, and starts exercise. The acceleration is inversely proportional to the quality. It is just like the same horsepower, the motorcycle speeds up faster than the car.The same lead in the lead, the lighter the self -weight of the float, the lighter the self -weight of the entire line group, and the faster the floating drift, so the more sensitive it feels in the actual fishing.

1. What is Diving equipment

Diving equipment refers to the various equipment and tools used in diving activities in diving activities, including respirators, diving, scoop, diving watches, diving shoes, diving mirrors, etc.According to uses and functions, Diving equipment can be divided into two types: personal equipment and auxiliary equipment.Personal equipment includes respirators, diving, foot, diving watches, etc., while theuxiliary equipment include diving ropes, buoy, oxygen superchargers, etc.

2. The role of Diving equipment

Diving equipment is essential for divers, because they can protect divers from harm to underwater environment and help divers to better explore the underwater world.Here are the role of different Diving equipment:

1. Diving

Subtaking is one of the must -have equipment for divers.It can protect the divers' body from low underwater damage, and can also prevent the stabbing of creatures such as jellyfish.Subtacks are usually made of rubber or synthetic materials, which have good elasticity and durability.

2, respirator

The respirator is a device for divers to breathe underwater.It is composed of air cylinders, regulators, respiratory Tube, etc., which can provide clean and dry air.The use of respirators is essential for divers, because it can prevent danger of suffocation during underwater breathing.

3. Diving shoes

In addition, diving shoes are also one of the necessary equipment for divers.It can protect the feet of divers from being stabbed by objects such as the underwater rocks. At the same time, it can also provide good grip to help divers to maintain a balance when walking on the bottom of the sea.

4. Diving mirror

Finally, diving mirrors are equipment used to observe the underwater environment.It is usually made of glass or plastic, which has good light transmission and waterproof properties.Diving mirrors can help divers to better observe underwater creatures and terrain, and at the same time, the eyes of divers can be protected from underwater stimulation and damage.

Third, the application field of Diving equipment

1. Leisure diving

Leisure diving is suitable for general water activities, such as snorkeling and diving tourism.Dives usually need a simple, comfortable diving suit and accessories to enjoy the beautiful scenery underwater.The leisure diving market focuses on the comfort and cost -effectiveness of the product, suitable for beginners and amateur enthusiasts.With the increase of people's interest in underwater activities, the leisure diving market will continue to grow.

2. Professional diving

Professional diving includes deep -sea diving and technical diving, which requires high -performance Diving equipment.Dives need to have higher protection and functionality to deal with complex and extreme underwater environments.The professional diving market emphasizes the technical content and functionality of the product, and is suitable for professional divers and senior diving enthusiasts.With the development of deep -sea exploration and technological diving, professional Diving equipment demand will continue to grow.

3. Rescue diving

Rescue diving for deep water rescue, underwater search and rescue, and salvage of shipwrecks.Dives need to be equipped with professional Diving equipment, such as dry diving clothing, buoyancy regulators and a variety of auxiliary tools to ensure the safety and efficiency of underwater.

The rescue diving market requires that the equipment has high reliability and versatility to deal with various emergency and complex underwater tasks.With the increase of rescue demand, the rescue Diving equipment market will develop rapidly.