Mixing device and coating mixing method for coating method silver tungsten carbide contact

Abstract

The invention discloses a mixing device and a coating mixing method for a coating method silver tungsten carbide contact. The mixing device comprises a mixing cylinder and a cylindrical container, the central column is concentrically fixed at the lower part in the mixing barrel; the powder spraying assemblies are distributed above the central column, and the lower portions of the powder spraying assemblies are connected into the feeding guide pipe; the spraying assembly is arranged in the center of each powder spraying assembly; the fan and the annular turbine fan blades can be driven by the motor to rotationally sleeve the periphery of the bottom of the central column; the grating assembly is arranged in a gap between the central column above the fan and the inner wall of the mixing barrel; and the negative pressure fan is fixed above the mixing drum and can provide upward negative pressure in the mixing drum, and a discharge port is formed in one side of the negative pressure fan. Compared with the prior art, according to the principle that particles with opposite charges on the surfaces can attract each other to be condensed, silver powder particles with positive charges can be adsorbed on the outer surface of tungsten carbide powder in airflow to form a coating layer.

Description

technical field [0001] The invention relates to the technical field of production and manufacture of silver tungsten carbide contacts, in particular to a mixing device and a coating mixing method for coating silver tungsten carbide contacts. Background technique [0002] The performance of electrical contact materials is one of the key factors affecting the working characteristics and electrical life of vacuum switchgear. The contact material needs to have appropriate breaking capacity, good compressive strength and welding resistance, appropriate thermal conductivity and electrical conductivity, low ablation speed during arcing, and long service life of the contact. Silver tungsten carbide contacts The material contains tungsten carbide with high melting point and a small amount of graphite added. Tungsten carbide and graphite particles are dispersed in the silver matrix, which has good electrical conductivity, arc burn resistance, welding resistance and low and stable cont...

AI Technical Summary

Problems solved by technology

Silver tungsten carbide contacts are manufactured by mixing powder infiltration. In the existing powder mixing process, the silver powder and tungsten carbide powder are mixed unevenly, and the large particles easily lead to insufficient uniformity of the contact material and performance degradation.

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