Method for cleaning seriously-rusted bend pipes' inner walls

Abstract

The invention relates to a method for cleaning seriously-rusted bend pipes' inner walls. The cleaning method comprises the following steps: (1) residual water on inner walls of bend pipes which have undergone a hydrostatic test is blow-dried; (2) the blow-dried bend pipes are placed on a trolley to be fixed well, directions of pipe orifices of all the bend pipes are maintained consistent, and the trolley is driven into a relatively sealed space; (3) a metal sleeve is arranged to sleeve a nozzle of a sand-blasting gun connected with sand-blasting equipment for placing river sand, and the sand-blasting gun is placed on a triangle support frame; (4) river sand is sprayed from one end of each bend pipe into the bend pipe; (5) after sand-blasting is finished, sponge is blown towards inner walls of the bend pipes so as to clean residual river sand and dust, and the trolley is controlled to move through a PLC program; and (6) inner surfaces of the bend pipes are checked through an endoscope so as to check whether rust is completely cleaned up. River sand is fine and small. Through the rotary sand-blasting operation technology, the inner walls are thoroughly cleaned up. The rust removal cost is low, labor intensity is low, and processing speed is fast.

Description

technical field [0001] The invention belongs to the technical field of boiler processing and production, and in particular relates to a method for cleaning the inner wall of a bent pipe with severe corrosion. Background technique [0002] The conventional process for cleaning the inner wall of the elbow of the pressure part of the boiler is to blow the sponge and compressed air, but for the pipe with serious inner wall rust, the effect of rust removal cannot be achieved after the above method, and the sponge and compressed air are repeatedly blown in time. The rust is still there and does not work. Although it does not affect the operation of the boiler, the appearance is unacceptable. If it is shipped to the customer according to this, it will cause serious economic losses. Because the material of the sponge is too soft, the rust cannot be removed through the inner surface. Scrape off. At present, electric wire brushes are used for rust removal, but wire brushes ca...

AI Technical Summary

Problems solved by technology

[0002] The conventional process for cleaning the inner wall of the elbow of the pressure part of the boiler is to blow the sponge and compressed air, but for the pipe with serious inner wall rust, the effect of rust removal cannot be achieved after the above method, and the sponge and compressed air are repeatedly blown in time. The rust is still there and does not work. Although it does not affect the operation of the boiler, the appearance is unacceptable. If it is shipped to the customer according to this, it will cause serious economic losses. Because the material of the sponge is too soft, the rust cannot be removed through the inner surface. Scrape off. At present, electric wire brushes are used for rust removal, but wire brushes cannot bend inside the pipe. Therefore, developing a medium that is hard and capable of turning to remove rust on the bend pipe is currently a difficult problem to solve the rust removal on the inner wall.