Pallet trucks are explosion-proof, you may not know it all the time!

Chemical explosions are classified into solid, liquid, and gas explosions according to different states of matter. Nowadays, many industries and units, such as petroleum, chemical, pharmaceutical, pigment, paint, coal, etc., are producing, concentrating, liquefying, storing and transporting flammable gases; or producing, filling, releasing, storing and transporting flammable liquids, and treating, When cleaning objects, the combustible gas or dust that may be generated mixes with the air to form an explosive mixture, making these areas inaccessible to ordinary vehicles.

Explosion-proof pallet trucks are specially designed and produced for places where explosive gas or dust may be generated, mainly to prevent vehicles from running in an explosive gas environment.

The following is a brief analysis of some explosion-proof knowledge about explosion-proof pallet trucks:

1. Conditions for the explosion of combustible gas

1. Internal conditions: the concentration of combustible gas is within a certain range, and the explosion occurs between the lowest concentration and the highest concentration.

2. External conditions: ignition of arc flash or open flame, ambient temperature above the self-ignition point, and radiation of a certain amount of energy may detonate. Specific to the vehicle, it is reflected as: electric sparks; mechanical collision sparks; the temperature of the heat-prone parts such as motors, electronic controls, brakes, oil pumps and valves may cause explosions.

Second, the explosive gas environment can be divided into three areas according to the degree of danger

Zone 0: the explosive gas environment is continuous A place where it appears or exists for a long time. (Motorized industrial vehicles are not allowed to enter)

Zone 1: a place where an explosive gas environment may occur during normal operation.

Zone 2: During normal operation, an explosive gas environment is unlikely to occur, and if it occurs, it occurs occasionally and only exists for a short time.

At present, the most high-level explosion-proof pallet trucks at home and abroad can only operate safely in Zone 1 and Zone 2.

Three, the explosion-proof method adopted by the explosion-proof pallet truck

1. Intrinsically safe type: from the energy of the circuit To limit, whether in normal or short-circuit fault conditions, the sparks, arcs and temperatures generated are not sufficient to ignite the explosive gas.

2. Structure of explosion-proof pallet truck Explosion-proof type: isolation measures are used in the structure to isolate the electrical appliance from the surrounding environment. Commonly used are: flameproof type, increased safety type, positive pressure type, oil-filled type, sand-filled type, casting type and other forms.

At present, the explosion-proof type of electric explosion-proof pallet truck is mainly explosion-proof type. Inside the shell, the flameproof shell can withstand the internal pressure without damage, and can ensure that when the internal flame gas spreads through the gap, the energy is reduced and it is not enough to detonate the gas outside the shell.