In order to prevent the influence of process dirt on the assembly and surface quality, a washing device for the liquid bathing workpiece is usually used to obtain high cleanliness of the machine parts. However, such a washing device has some defects, such as trapping air in the blind hole and the closed cavity of the workpiece, and not being able to dry the cleaned workpiece at the same time, and the labor productivity is low. The Soviet Union developed a vacuum washing device that overcomes the above drawbacks.
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