Belt type explosion-proof lamps. According to the explosion-proof type, there are 5 main types of explosion-proof type, increased safety type, positive pressure type, non-sparking type and dust explosion-proof type. It can also be combined with other explosion-proof type and various types of explosion-proof type or composite type and special type. . The components of the equipment that may ignite the explosive gas mixture are all enclosed in a casing whose outer casing can withstand any joint surface or structural gap through the casing, and the flammable mixture penetrating into the interior of the casing explodes inside without damage, and can ensure internal When the flame gas propagates through the gap, it reduces energy and is not enough to detonate the gas in the outer casing. Electrical equipment that does not generate arcs or sparks under normal operating conditions takes additional measures to increase its safety and prevents explosion-proof patterns of dangerous temperatures, arcs and sparks that may be present in its internal and external components. Protection measures to improve the reliability and safety of equipment. The flammable mixture is allowed to enter the interior of the enclosure by maintaining the pressure of the protective gas inside the enclosure above the ambient explosion-proof ambient pressure to safe electrical equipment to protect the static positive pressure within the system or to maintain a continuous flow of air or inert gas. Take away the flammable gases entering the enclosure when the device is not positively pressurized to prevent the formation of a flammable mixture within the enclosure. All circuits inside the equipment are intrinsically safe circuits in an explosion-proof atmosphere that cannot be specified by any spark or any effect under standard conditions (including normal operation and specified fault conditions). An electrical component that may generate sparks, arcs, or dangerous temperature portions that ignite an explosive mixture, is encapsulated in a potting compound (composite) so that it does not ignite the surrounding explosive mixture by encapsulation to prevent electrical components Short-circuit, solidified electrical insulation, avoiding sparks on the circuit and ignition of arcs and dangerous temperatures, preventing the intrusion of explosive mixtures and controlling the surface temperature under normal and fault conditions. The entire equipment or parts of the equipment are invaded into the oil I protection liquid l so that it cannot point to an explosion-proof gas environment above the fuel surface or outside the outer casing. The shell is filled with sand or other powder material of defined characteristics so that under the specified conditions of use, the arc or high temperature generated in the shell cannot ignite the electrical equipment protection type of the surrounding explosive gas environment. Airtight type h This type of explosion-proof equipment is airtight. That is, the explosive gas mixture in the environment cannot enter the inside of the equipment casing. The hermetic outer casing is sealed by melting, squeezing or gluing. Most of the outer casing is non-removable to ensure permanent tightness. Classified according to the degree of protection of the enclosure: in order to protect dust, solid foreign matter and water from entering the lamp cavity, touching or accumulating on live parts, there is a risk of flashover, short circuit or damage to electrical insulation. The role of insulation. Use the characteristic letter "IP" followed by two numbers to characterize the degree of protection of the enclosure. The first number indicates the ability to protect against humans, solid foreign objects or dust. Divided into 0-6. Explosion-proof luminaires are sealed luminaires with a dust-proof capacity of at least 4 or more. The second number indicates the protection against water and is classified into 0-8.