Method for restoring slurry pump casing used for river and sea dredger

Abstract

The present invention discloses a repair method for the internal pump shell the imported dredger high chromium cast iron mud pump and the internal pump shell the domestic dredger high chromium cast iron mud pump; the rust and burr on the fretted surface of the internal pump shell of the mud pump is removed and angles are ground on a plurality of parts according to requirements. With the short-arc welding of multi-pass welding and skip welding processes, a priming coat of reticular arrangement is welded on the clean internal pump fretted surface of the mud pump; at the same time, the welding seams are beat to remove the stress and avoid crack formation and control the interpass temperature on the priming coat surface. With the short-arc welding of the multi-pass welding and skip welding processes adopted by UTP abrasion welding rod and DC welder, a first abrasion layer, a second abrasion layer, an isolating layer, a third abrasion layer and a fourth abrasion layer are welded on the priming coat and the interpass temperature of every layer is controlled. The repaired internal pump shell of dredge mud pump will not be deformed and the matrix will not be damaged; the welded layers are abrasion and impact resistant; the cost can be saved by 70 to 90 percent; the service life can be prolonged by 3 to 5 times. Therefore, the present invention has great dissemination value.

Description

technical field [0001] The invention relates to a repair method, in particular to a repair method applied to an inner pump casing of a mud pump used in a river and sea dredger made of high chromium cast iron. Background technique [0002] There are countless dredgers in the rivers and oceans of our country, and each dredger is equipped with a mud pump to fish up the mud and sand in the river and the ocean as building materials for building docks, reclamation and dredging rivers. When the mud and sand are excavated and transported, they will collide or hit or rub the inner pump casing of the mud pump when they pass through the mud pump. After a period of time, the inner pump casing of the mud pump will rub out countless grooves with different depths and widths due to the collision or friction of mud and sand, and some parts will even wear through and cause the inner pump casing of the mud pump to be scrapped. Due to the special use environment and conditions, the inner pump ...

AI Technical Summary

Problems solved by technology

Before the present invention, once the inner pump casing of the mud pump used on the river and sea dredger was worn out, it would be scrapped, and then a new inner pump casing of the mud pump was introduced from abroad, which not only caused waste of equipment, but also increased the production cost

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