Cleaning is an important part of centrifugal pump repair work, and the quality of cleaning has a significant impact on the quality of mechanical repair. Adopting the correct cleaning method to improve cleaning quality and reduce costs is one of the issues that repair workers must consider.
Cleaning in repair work includes mechanical external cleaning and part cleaning. Part cleaning can be divided into pre identification cleaning, pre assembly cleaning, and pre work preparation cleaning for part plating or bonding due to different purposes.
In part cleaning, the cleaning requirements for plated and bonded parts are high, and the cleaning quality is not high. It is often the cause of coating or bonding failure, and the cleaning quality of component assembly has a significant impact on the service life of machinery. Due to severe cleaning failure, a large amount of abrasive may seep into important friction pairs or cause early wear and accidental damage to machinery due to blockage of lubricating oil passages by dirt. This can occur in some non-standard repair work and must be taken seriously.
Here are a few examples of cleaning centrifugal pumps. The specific principles for clearing will be explained in detail later.
1) Scrape off the scale and rust accumulated on the inner and outer surfaces of the impeller, as well as the sealing ring and bearings, and then clean and blow them clean with water or compressed air.
2) Clean the accumulated oil and rust on the joint surfaces of the shell.
3) Clean the water seal pipe and check if the inside of the pipe is unobstructed.
4) Clean the bearing shell and bearings, remove oil stains, and then clean the oil ring and oil level gauge. Ball bearings should be cleaned with gasoline.
5) Parts and components that are not currently being assembled should be coated with oil for protection after cleaning.
The basic principle of cleaning is that all cleaning methods must fully consider the following basic requirements.
1) Ensure that the cleanliness requirements for the parts are met. During repair, the cleanliness requirements for different parts vary. In assembly, the cleaning requirements for mating parts are higher than those for non mating parts, dynamic mating parts are higher than static mating parts, and precision mating parts are higher than non precision mating parts. The cleaning requirements for the surfaces of workpieces that are sprayed, plated, and bonded are very high. When cleaning, different cleaning agents and methods must be used according to different requirements to ensure the required cleaning quality.
2) To prevent corrosion of parts, no degree of corrosion is allowed on precision parts. When parts need to be parked for a period of time after cleaning, the rust prevention ability of the cleaning solution or other rust prevention measures should be considered.
3) Ensure operational safety, prevent fires or harm to human health, and prevent environmental pollution.
4) Emphasizing economic benefits, while ensuring the above conditions, the premise of improving economic efficiency should be to improve work efficiency, reduce raw material costs, and lower equipment costs.
The cleaning work of parts includes several aspects such as oil removal, rust removal, removal of paint layer and scale, etc., which will be discussed and answered separately.
