No more than 5 meters.
According to the official website of the Coal Mine Safety Production Network, we learned that the "Coal Mine Safety Regulations" stipulates that the distance between the conduit outlet air and the working face of the excavation is clearly stipulated in the operating procedures according to the specific circumstances, but the maximum should not exceed 5 meters. The air duct is anti-static and flame retardant. The distance between the mouth of the air duct and the excavation work surface as well as the installation of local fans and air ducts for mixed ventilation are clearly stipulated in the operating procedures.
What must be used underground must be made of fireproof materials
Calculate. Flame retardant air duct fabric used in underground mines other than coal belongs to the category of safety protection installations.security of mining production and can be used as a security expense. Mines are a high-risk production environment. In order to protect the lives and property of miners, a series of safety protection measures should be taken, including the installation of flame-retardant air duct fabrics and other protective facilities to reduce the occurrence of mines. fires, explosions and other safety accidents. Therefore, flame-retardant air duct fabric is a necessary equipment for mining production safety, and its cost can be included in the cost of mining production safety to ensure the safety of people's lives and property. minors.
Features of air ducts
Cables, air ducts and conveyor belts.
The underground environment is complex, with adverse factors such as high temperature, high humidity, corrosion, etc., and the use of maflammable materials. Once an accident occurs, it will not only endanger people's safety, but also. also cause serious damage to equipment and increase maintenance costs. Cables, air ducts and conveyor belts are all made from flame retardant materials. The use of flame retardant materials can effectively reduce the risk of fire and ensure the safety of underground operations.
The latest standard in double strength wind cylinders in coal mines
It is made of seamless cylinder blanks and steel wires to carbon spiral springs, using advanced heat sealing technology. It has the characteristics of good suction effect, easy turning, convenient transportation and storage (can be folded) and long service life. As shown in the picture above: Usage: Flexible pipes used in mcoal mines, tunnels, subway projects and underground to locally guide air flow in a certain direction.
Classification: positive pressure air duct, air duct negative pressure; three ventilation duct
Variety and material: According to the covering material, the hair dryer is divided into rubber coated cloth hair dryer, plastic coated cloth hair dryer and plastic coated cloth hair dryer in rubber-plastic coated fabric. It is anti-static and heat resistant.
Production execution standards: Standard number: MT164-2007 Huai Standard, Standard number: MT165-2007 Huai Standard. "Rubber or plastic coated fabric dryer" specifies the classification, structure, technical requirements, testing methods, inspection rules, packaging, marking, transportation and storage of air ducts. air in fabric coated with rubber or plastic.
Packaging, storage and translogo port 1. Compress the hair dryer in axial direction to less than 700mm in length, fix it in 3-4 places with ropes or cloth strips, then pack it with good materials quality. wear resistance.
2. During transportation, the hair dryer must be protected from mechanical shock and friction, as well as from sun and rain. 3. Products should be stored in a well-ventilated warehouse, and the stacking should not be too high to avoid affecting the quality of use. Used air guides should first be rinsed and dried, then folded and stored. Avoid contact with substances that may damage the quality of rubber and plastic. Avoid direct sunlight and rain. The storage temperature should be between -15℃ and 35℃, the relative temperature should be between 45-75%, and it should be 1m away. of the heat source.
4. Under the conditions of transport and storage specified, the flame retardant and antistatic properties of the product must comply with the provisions of this standard within one year from the date of production.
5. The air guide duct must have appropriate specifications according to the tunnel requirements and fan air volume, as well as special shape specifications such as elbows and tees. Pay attention to the direction of the air. flow rate when connected.
6. It should be hung in the tunnel straight and straight, tightened and hung tightly, hung at each turn, repaired when damaged, rotated slowly, and removed from the water to help reduce resistance. (Repair method: wash the damaged area, dry it and treat it with glue) Usage: Used in kitchen and bathroom, home and small household appliances
Category: Regulation of temperature and speede, induction motor.
Points to note when using the hair dryer:
1 The hair dryer can only be used at home and not for other industrial purposes!
2 Make sure your hands are dry when using! Never immerse the hair dryer in water!
3 Make sure the product is kept away from water. Do not use the hair dryer in the bathroom or near other containers of water!
4 The hair dryer turns off automatically when the overheating protection device works and can be used again after a few minutes of cooling!
5 Do not block the air inlet or outlet of the hair dryer. Keep the air intake grille clean and don't let it be blocked by hair!
6 After each use, the power supply should be disconnected immediately. After cooling, store it in a well-ventilated, dry place, away from sunlight.
1. According to the latest coal mine standards, the air duct should not be more than 5 m from the coal tunnel working face and 7 m from the rock tunnel working face, and there should be no break in the air duct.
2. Use a fireproof air duct: the air duct joint is tight (no air leakage is felt at a distance of 0.1 m from the joint) and there is no breakage (except at the end). 20 m). There is no reverse seal. The soft air duct joint should be counter-pressed, the hard air duct joint should be padded, and the screws should be tightened.
3. The hair dryer should be hung straight and straight, and should be hung wherever there is a ring.