Multi-stage synchronous powder mixer and thermal spraying device

Abstract

The invention discloses a multi-stage synchronous powder mixer and a thermal spraying device. By adoption of the multi-stage synchronous powder mixer and the thermal spraying device, the problem thata powder mixer in the prior is poor in mixing uniformity is solved. The multi-stage synchronous powder mixer and the thermal spraying device have the advantages that mixing is uniform, and mixing in different proportions can be achieved. According to the scheme, the multi-stage powder mixer comprises a first-stage powder mixer and a second-stage powder mixer, wherein the first-stage powder mixer is provided with a plurality of powder inlets and is also provided with an air inlet; the second-stage powder mixer is arranged at an outlet of the first-stage powder mixer, a diameter-variable channelis formed at an inlet of the second-stage powder mixer to accelerate a powder flow, a mixing channel communicating with the diameter-variable channel is formed in the second-stage powder mixer, and gas at a set pressure can be introduced into the mixing channel; and gas is delivered to an inlet of the mixing channel, so that the powder flow and the gas at the set pressure encounter at the inlet of the mixing channel, and then the inlet of the mixing channel is rapidly filled with the powder flow.

Description

technical field [0001] The invention relates to the field of spraying, in particular to a multi-stage synchronous powder mixer and a thermal spraying device. Background technique [0002] Thermal spraying technology is a processing technology that uses a certain heat source to rapidly heat the sprayed material, so that the sprayed material is sprayed on the surface of the part to be processed in a molten or semi-molten state to form a surface coating. Traditional thermal spraying materials are powder, ribbon, filament or rod, among which thermal spraying technology using powder materials is the most widely used. [0003] Gradient coating is a kind of heterogeneous coating, which is suitable for complex profile workpieces working in erosion environment. The damage effect of erosion particles on the surface of the part is completely different under different impact angles. When the impact range of the curved surface is large and the impact angle varies greatly, the traditiona...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional thermal spraying preparation is generally a homogeneous coating, and the proportion of the spraying material prepared in a single time is fixed and the composition is uniform. During the spraying process, it cannot be adjusted according to the ratio requirements of different areas of the surface to be sprayed.

Although the thermal spraying preparation system with dual channels and dual spray guns currently in use can solve this problem to a certain extent, due to the different material densities in the two pipelines, after the powder is sprayed from the spray gun, it will not be able to reach the surface of the part. Avoid delamination, resulting in insufficient mixing and affecting coating quality

[0005] In summary, there is still a lack of effective solutions in the existing thermal spraying technology

Images