Longhua uses the world's unique liquid nitrogen (minus -196 ℃) die-casting machine assembly structure assembly process (thermal expansion and contraction), which can completely guarantee that the die-casting machine assembly structure has zero failure rate in production.

Liquid nitrogen: liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable, and extremely low temperature. Nitrogen makes up most of the atmosphere (78.03% by volume and 75.5% by weight). Nitrogen is inactive and does not support combustion. Frostbite caused by a large amount of endothermic contact during vaporization.

Under normal pressure, the temperature of liquid nitrogen is -196 ° C; 1 cubic meter of liquid nitrogen can expand to 696 cubic meters of pure gaseous nitrogen at 21 ° C. Liquid nitrogen is a colorless, odorless liquid and gas that is cold at high pressure.

Liquid nitrogen (often written as LN2) is a liquid form of nitrogen formed at low temperatures. The boiling point of nitrogen is -196 ° C. If the temperature is lower than normal atmospheric pressure, liquid nitrogen will be formed; if pressurized, liquid nitrogen can be obtained at a higher temperature.

In industry, liquid nitrogen is obtained by fractional distillation of air. After the air is purified, it is liquefied in a pressurized and cooled environment and separated by the different boiling points of the components in the air. Nitrogen (78.09% of the volume of air) was first leached (and not liquefied), by 0.93% of the rare gas in the air, and finally 20.95% of oxygen. There is no problem with the human skin's direct contact with liquid nitrogen immediately, it will frostbite and irreversible after more than 2 seconds.