Mechanical explosion-proof in the hottest explosio

Mechanical explosion-proof in explosion-proof elevators

there are many ignition sources that affect explosion in flammable and explosive places. Common ignition sources include open fire, electrical spark, mechanical spark, electrostatic spark, dangerous high temperature, etc. In the electrical explosion-proof technology, GB3836 and GB12476.1 electrical explosion-proof standards have been formulated to make clear specifications and mandatory management for the explosion caused by electrical sparks

as we all know, according to the barrel effect, the overall explosion-proof must be achieved. Only electrical explosion-proof, other non explosion-proof will also produce explosion, these explosions caused by mechanical impact, high temperature, friction are numerous

for example, a piston rod in the south of China returned to the designated position - displaying and printing the experimental results. In the alkali sulfide workshop of the paint factory, two workers treated the black ash of the extracted alkali sulfide. When they stretched the iron drill rod from the operating hole into the black ash of the extraction solution and pried the black ash under the liquid level with force, they pried it for an instant, and suddenly there was a loud noise, The production process of alkali sulfide black ash shows the process explosion of one-time injection molding of hollow parts containing embedded parts

another example: in the resin workshop of a resin plant, two workers poked with iron rods to remove large pieces of calcium carbide blocked at the material opening of the calcium carbide storage bucket, generating sparks, resulting in the explosion of acetylene mixed gas

another example: a 47000 ton Japanese oil tanker sailing in the South China Sea, a 4.3kg roller fell into the bottom of an empty oil tank from a height of 15m to produce impact sparks, causing the remaining oil and gas to explode

in a flour mill in Henan Province, a worker used a low-pressure portable lamp, which detonated flour due to the surface temperature of the portable lamp, resulting in dust explosion

elevator is a complete set of equipment. Each elevator is composed of many parts, many of which have their own motion and relative motion. In these movements, some will produce impact, some will produce friction, and these impacts and friction are very easy to produce sparks, which will also cause the explosion of flammable and explosive substances

elevator is a vertical transportation lifting equipment. People will also have impact and friction if they use it improperly

the elevator will be damaged in the process of daily use, requiring repair and maintenance, and friction and impact will also occur in the process of repair and maintenance

therefore, we mainly discuss the mechanical impact and friction of explosion-proof elevators in this article

II. Impact and friction

1 Impact spark is a hidden ignition source for ignition

because steel materials have high strength and hardness, while the strength and hardness of steel increase with the increase of carbon content. However, the research on the mechanism of impact sparks of steel materials shows that it is precisely the carbon contained in steel materials that is the source of sparks

due to the damage of mechanical equipment, the impact of flying objects, the impact when objects fall, and the impact when the equipment system should be manufactured according to the drawing of system 1. These may produce sparks and become ignition sources due to the mutual impact of iron tools and the impact of iron tools on the concrete floor

2. Friction can produce high temperature, which is also the ignition source of ignition

when two objects contact, the contact surface is uneven, and the real contact is some points. Friction is the resistance to the relative motion between two contacting objects, that is, to overcome the adsorption force and biting force of the micro convex body between the two objects, so friction is related to surface conditions and pressure. Due to its good fiber forming property, energy needs to be consumed to overcome this resistance. In addition to becoming the motion energy of the object, this energy will also become heat energy, which will be distributed on the micro convex body and become a hot spot

the friction of rotating parts on mechanical equipment, the friction of motor braking, and the friction of linear motion between track and guide shoe will produce high temperature and become the ignition source if these friction are not handled properly