proof tools
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Guangzhou Jinghua Machinery Co. Ltd.

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What is the proof tools, explosion-proof mechanism

Source: this site   Popularity:   The time of issue: 2013-03-01 13:30:00

Brazing, pickaxe, hammer, pliers, wrench, spreaders and other tools and equipment made ​​of iron and steel materials usually occur in the fall of the intense action or missed friction, impact sparks hidden blew the fire source, these tools can not be in the explosion hazardous locations. Tool for use in explosion hazardous areas (equipment) must take place by friction, impact sparks, hot hot surfaces can not even produce special material, this tool is called proof tools.

The steel material has a higher strength and hardness, suitable for manufacturing tools, but the strength and hardness of the steel is increased with the increase in the amount of carbon. However the steel material friction sparks Mechanism study results show that it is precisely the carbon contained in the steel is a source of friction sparks. In order to eliminate the friction of the tool, the impact spark, it is the selection of the direction turned to copper.

The copper used as explosion-proof tools, compared two different qxz and steel

First, do not contain carbon. Oxygen - iron - carbon reaction chain does not appear, so I do not spark.

Secondly, the strength and hardness of the copper is relatively low, the thermal conductivity than the steel, a friction or impact occurs, local points of friction will be plastically deformed and to avoid the friction energy is concentrated in the respective contact point, coupled with the high thermal conductivity of the material resistance, the friction heat generated is rapidly dispersed into the matrix and reduce friction strike point appears glowing hot danger.

The above two points is explosion-proof mechanism of copper (copper alloy) tools.

However, the strength and hardness of the pure copper is too low, can not be directly used as the tools, the need to add the appropriate elements such as beryllium, aluminum, titanium, nickel, magnesium and the like melt into a copper-based alloy to improve its strength and hardness. However, when the increase of the strength and hardness, the second feature of the aforementioned copper in explosion-proof tools there to weaken or disappear dangerous. Thus, further explore the technical approach of the "best of both worlds". This is the request formulated copper-based alloy having a high strength and hardness at room temperature, once subject to friction, impact, and the temperature rises to a certain extent, of the microstructure of the copper-based alloy phase change is transformed into low strength and appears plastically the deformation even wear stripping Apartments. The decline the then local friction surface of the metal friction resistance, friction and impact the maximum temperature is restricted in the alloy below the phase transition temperature, become not ignite an explosive mixture of explosion-proof alloy. Abroad, known as non-hazardous sparks metal. Industrial bronze, aluminum bronze, J892 copper alloys and other copper-based alloy is successfully used in explosion-proof tools.

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