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

Abstract

The invention discloses a repair method for the inner pump casing of the high-chromium cast iron mud pump of imported dredgers and the inner pump casing of high-chromium cast iron mud pumps of domestic dredgers. First, the rust and burrs on the worn surface of the inner pump casing of the mud pump are removed, Some parts are angled as required. On the worn surface of the pump casing in the clean mud pump, use the short-arc welding process and the skip welding process to surfacing the mesh-shaped bottom layer, and knock the weld seam at the same time to eliminate stress, avoid cracks, and control the bottom layer surface. interlayer temperature above. UTP wear-resistant electrode and DC welding machine are used to weld the first wear-resistant layer, the second wear-resistant layer, the isolation layer, the third wear-resistant layer and the second wear-resistant layer on the bottom layer by short-arc welding process and skip welding process. Four wear-resistant layers to control the interlayer temperature of each layer. The inner pump casing of the repaired mud pump for dredgers does not deform and does not damage the substrate. The surfacing layer is wear-resistant and impact-resistant, saving costs by 70-90%, and the service life is increased by 3-5 times, which has promotional 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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