Explosion-proof mechanism of explosion-proof tools

Release time:

Mar 20,2022

Tools (equipment) used in explosive hazardous places must be made of special materials that do not cause friction, impact sparks, or even produce hot high-temperature surfaces. Such tools are called explosion-proof tools.

Tools (equipment) used in explosive hazardous locations must be made of special materials that do not cause friction, impact sparks, or even produce hot high-temperature surfaces. Such tools are called explosion-proof tools.

is usually made of steel materials, such as drill, pick, hammer, pliers, wrench, spreader and other tools and equipment in its violent action or accidental fall of friction, impact spark is a hidden source of ignition, so these tools can not be used in explosion dangerous places.

Steel material has high strength and hardness, suitable for manufacturing tools, and the strength and hardness of steel increase with the increase of carbon content. However, the study of the mechanism of friction sparks in steel materials shows that it is precisely the carbon contained in steel materials that is the source of friction sparks.

steel is used as an explosion-proof tool. Compared with steel materials, there are two significant differences:

first, no carbon. There is no oxygen-iron-carbon reaction chain, so there is no spark.

Second, the strength and hardness of steel are relatively low, and the thermal conductivity is higher than that of steel materials. When friction or impact occurs, local friction points will undergo plastic deformation to prevent friction energy from concentrating on individual contact points. With the high thermal conductivity of the material, the heat generated by friction is quickly dispersed to the matrix to reduce the risk of hot and high temperature at the friction impact point.

is based on the above explosion-proof mechanism of steel (copper alloy) tools. In order to eliminate the friction of tools and impact sparks, people turned the direction of material selection to steel.

However, the strength and hardness of pure copper are too low to be directly used as tools. It is necessary to add appropriate elements such as beryllium, aluminum, titanium, nickel, magnesium, etc. to melt into copper-based alloys to improve its strength and hardness.

However, when the strength and hardness are improved, the second characteristic of the aforementioned steel on explosion-proof tools is in danger of weakening or disappearing. As a result, people further explore the "best of both worlds" technical approach. This requires the preparation of copper-based alloy at room temperature with high strength and hardness, once by friction, impact, the temperature rises to a certain extent, the copper-based alloy of the gold-phase tissue phase change and transformed into low strength and plastic deformation and even wear and tear.

At this time, the metal friction resistance on the local friction surface decreases, and the maximum temperature of friction and impact is limited below the phase change temperature of the alloy, which becomes an explosion-proof alloy that cannot ignite explosive mixtures. Foreign known as non-hazardous spark metal.

Now the industry has hinged bronze, aluminum bronze, J892 copper alloy and other copper-based alloys have been successfully applied to explosion-proof tools.

Focus on hot spots

President of China Foundry Association came to the company to investigate the renovation project of explosion-proof tools.

On January 9, 2022, Zhang Libo, President of China Foundry Association, Fan Qi, Vice President, and his party came to our company to investigate and guide the upgrading and transformation project of the sixth generation of explosion-proof tools. Mr. Yang Qinglai, Chairman of the Group Company, accompanied the explanation. During the investigation, President Zhang Libo highly praised Zhongbo Group's outstanding contribution to China's explosion-proof tools, affirmed the development of Zhongbo Group, and gave hope for the future of Zhongbo Group.

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