1. Main types of goggles
1. Absorption filters
1) Sunglasses
Also known as sunglasses, the transmittance of visible light is about 20 percent, and the absorption of ultraviolet and infrared rays is good. There are light green, light gray, light tea and other colors, used to make sunshade and snow work protective glasses. Among them, light gray lenses have the least impact on color recognition; light tea glasses make the blue sky look darker and reduce the transmission of green light; light green lenses reduce the transmission of red light.
2) Goggles for gas welding
The colorants used in these lenses are mainly iron oxide, cobalt oxide, etc., which are yellow-green and can absorb all For light waves with wavelengths below 500urn, the transmittance of visible light is below 1 percent, and only a small amount of infrared rays can pass through. These glasses are intended for use in gas welding operations.
3) Welding goggles
The ultraviolet rays generated by electric welding can cause damage to the cornea and conjunctiva tissue when irradiating the eyeball for a short time (with 28nm light is the most serious). The intense infrared rays produced can easily cause clouding of the eye lens. Welding goggles can block the above infrared and ultraviolet rays well. This lens is based on optical glass, using colorants such as iron oxide, cobalt oxide and chromium oxide, and also adds a certain amount of cerium oxide to increase the absorption of ultraviolet rays. Appearance is green or yellow-green. It can block all ultraviolet rays, the transmittance of infrared rays is less than 5 percent, and the transmittance of visible light is about 0.1 percent.
4) Blue goggles
There are two kinds of these glasses, one is colored iron oxide and cobalt oxide, and it is used to see the filament as Fuchsia, the other is colored with copper oxide and manganese oxide, and the filament is white when viewed with it. They can all absorb the dazzling glare in the band of 500-600nm (the visible light sensitive area of the human eye), the light transmittance at 400nm is below 12 percent, and they also have a certain absorption effect on ultraviolet rays. They are suitable for various industrial high-temperature furnace operations. Personnel wear.
5) Crimson Glass Glasses
These spectacle lenses are dark red glass tinted with cadmium sulfide and cadmium sulfide selenide. Absorbs all light with wavelengths below 600nm. It can be used as goggles when medical or industrial personnel operate X-ray fluoroscopy equipment.
6) Laser protective glasses
There are two types of glasses, namely reflective and absorbing, the former is coated with a vacuum coating method The metal film has a reflectivity of more than 99.5 percent for laser wavelengths such as 532nm, 694nm and 1060nm; the latter lens can completely absorb the 1060nm laser band. The lens must be equipped with a closed or semi-closed frame to prevent the laser from bypassing the lens and entering the eye. Can be used as protective glasses for laser operators.
7) Microwave protective glasses
Microwave is an electromagnetic wave with a wavelength of about 1nm-lM, which can also cause harm to people, especially the eyes . Under the action of strong microwave, it can cause eye fatigue, dry eyes and dizziness, and even lead to lens opacity, cataract and retinal damage. Its protection is to spray tin tetrachloride and a metal compound that can improve the conductivity on the surface of the lens to form a multi-layer conductive film on the surface of the lens, which plays the role of shielding microwaves. Because microwave energy bypasses the lens and enters the eye, the frame should also be shielded to prevent microwave damage to the eye.
< strong>2. Reflective filters
Absorptive filters use lenses to absorb certain wavelengths of light to reduce the intensity of light entering the eye, but due to the use of lenses to absorb light of certain wavelengths It absorbs some light and turns it into heat, especially infrared light and some other light with longer wavelengths, which makes the eyes feel uncomfortable due to the accumulation of heat. This problem can be solved well if a reflective filter is used. It was introduced in the front coated glasses that if a layer of material with a higher refractive index than the lens itself is coated on the surface of the lens, it will increase the reflection of light and reduce the transmitted light intensity of the light, so as to protect the Eyes are not damaged by bright light and harmful rays. In actual work and life, in many cases, the absorption type and the reflection type are used together, that is, a high-reflection film is coated on the colored lens to make the filtering effect stronger, such as electric welding, chlorine arc welding, plasma cutting and other operators. Wear glasses, you can use this method to solve.
2. How to wear safety glasses
1. Before using safety glasses, you should refer to the manufacturer’s instruction manual to understand Wearing methods and precautions;
2. Before wearing safety glasses, check whether the product is in good condition, whether the wearing is stable, and whether it will fall off when bending down or doing work-related actions;
3. In places where there is a risk of eye hazard, everyone should always wear protective glasses;
4. Protective glasses should be used for special purposes as much as possible to avoid disease transmission;
5. In order to prevent scratches on the lenses of protective glasses, the lenses must be placed upside down during storage to avoid contact with rough surfaces, and do not use rough cloth or paper towel to wipe the lenses;
6. Wipe the lenses Do not use organic solvents, do not scratch the lenses with knives
or sharp tools, and do not put safety glasses together with hard objects such as parts and tools;
7. To prevent the deformation of safety glasses, do not squeeze too much Or place heavy objects on the glasses;
8. If the lenses of the safety glasses are slightly scratched, it will not affect their impact resistance. must be replaced.
Three.How to wear goggles if you have glasses
1. Wear a mask first. Hold the protective mask with one hand, with the side with the nose clip facing outwards; cover the mouth and nose with the protective mask, with the nose clip up and close to the face; use the other hand to pull the upper headband to the top of the head; then put the lower headband Pull over the top of the head and put it on the back of the neck and under the ears; place the tips of both fingers on the metal nose clip, starting from the middle position, press the nose clip inward with your fingers, and move and press to the sides respectively, shaping according to the shape of the bridge of the nose Nose clip; final tightness check, including positive and negative pressure tests.
Positive pressure test: Cover the mask with the palms of both hands and exhale forcefully. If you feel gas leaking from the sides of your nose, chin or other parts, you need to re-adjust the position of the headgear and mask, and re-test until No leakage; negative pressure test: then cover the mask with the palms of both hands, inhale hard, if there is no gas leaking from around the mask, it means the mask is well sealed to the face, if there is air entering from the edge of the mask, adjust the headband and nose clip.
2. Wear glasses to ensure that they do not fall, and contact lenses can be worn if conditions permit.
3. Wear goggles. Cover your eyes with a blindfold in one hand, and pull the strap to the back of your head with the other hand.
4. Adjust the goggles. Place the eye mask on the appropriate part of the eye and adjust the elasticity of the rubber band to ensure a certain tightness around the eyes.
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