How to repair the surface defects of Roots blower impeller?

How to repair the surface defects of Roots blower impeller? How to repair the surface defects of Roots blower impeller? Check the impeller surface for sand holes, cracks, etching marks, friction damage, etc. The way to check the crack is: Roots blower

① Clean the impeller surface and observe it with naked eye or magnifying glass.

② Tap the impeller gently with a hammer, and analyze and judge according to the sound. When the sound is brittle, it indicates that the impeller is intact; If the crack is thick, there will be cracks, and further inspection must be carried out.

③ Clean the impeller and coat it with gasoline. The cracked position will be quickly penetrated by gasoline. After wiping, coat it with white frost. Then gently tap the impeller with copper beech. The cracked area will be squeezed by gasoline, and a black strip will appear on the white fen.

For the surface defects of the impeller, there are generally the following solutions:

(1) If the impeller, as a rotating part, has cracks or large or more sand holes on the blade, repair welding is not allowed under normal circumstances and should be replaced.

(2) When there are friction marks on the top and inner hole of the impeller, it can be polished with an oilstone or a fine file, but the negative impeller diameter cannot be too much ground to prevent the expansion of too much space between the impeller and the housing from harming the characteristics of the blower.

(3) After the impeller surface is etched, if there is no spare part to be replaced, it must be repaired and applied. The working pressure sandblasting machine can be used for sandblasting to remove the etched layer; After obtaining clean and unsmooth specific metal surface Later, plasma spraying technology is used to prepare anti-corrosion coating on the surface of the impeller and repair its specifications. hdfJ11.COm

If the top of the impeller is damaged too much, the method of inlaying metal strips can be used for maintenance. The dovetail groove can be opened at the top of the impeller to soil the steel bars produced and processed into the groove. In order to avoid the radial movement of the steel bar, 3~4 screw holes are drilled at the bottom of the dovetail groove, the relative connection holes are drilled on the soil bar, and the sink pit is countersunk. After installation, the slope roof countersunk bolt is used to fix it, and the screw is riveted after tightening. In addition, the method of casting hard lead (containing 10% antimony and other lead) in dovetail groove can also be used 。

At this time, 3~4 non buried holes must be drilled at the bottom of the dovetail groove to avoid the radial shaking of the lead bar in the groove body. Because hard lead has excellent characteristics of resistance to dilute hydrochloric acid etching, and has good processability, it is easy to scrape and file It is widely used in the repair of sulfur dioxide blower.