Wear-resisting sand pump and casting method thereof

Abstract

The invention discloses a method for casting a wear-resisting sand pump. In the wear-resisting sand pump, a pump impeller, a material inlet and a pump body are precisely cast by a vacuum lost mold; a shaft is connected with the pump impeller through an outer cone and an inner cone; and the outer cone and the inner cone are rectangular, prismatic or hexagonal and are fastened by screws. The precise casting method comprises the following process steps of: 1, partitioning a foam material to obtain main parts, and bonding by using an adhesion agent to obtain an integrated model of which the shape is consistent with the main shape of a casting; 2, coating a mica-based coating onto the outer surface of a foam model, and drying; 3, putting the dried foam model into a sand box, filling dry sand into the sand box, and performing three-dimensional oscillation compaction; 4, vacuumizing the sand box by using a vacuum system through negative pressure; 5, pouring molten metallic iron from the feeder head of the sand box to replace the position of a foam-molded model so as to obtain a corresponding main part of the sand pump; and 6, condensing. The wear-resisting sand pump has the characteristics of high casting quality, high surface precision, high rigidity, high wear-resisting property, environment friendliness and the like, and is sanitary, safe and reliable.

Description

technical field [0001] The invention relates to a centrifugal pump, in particular to a wear-resistant sand pump and a casting method thereof. Background technique [0002] The pump is a kind of fluid machinery for transporting liquid. It transfers the mechanical energy of the prime mover or the energy of other energy sources to the liquid to increase the energy of the liquid. The sand pump is mainly used for river sand mining marine equipment. It is used for transporting water, Sand and stones, the working conditions in the pump body of the sand pump and stone pump are very bad, because these sand and stones are sent out from the pump port after being squeezed from the suction port through the pump blade distribution pump casing for a long time, and the pump is in contact with sand and stones. A long time has caused serious wear and tear on the pump body and pump blades. Therefore, the current sand pumps and stone pumps include high-alloy cast steel pumps and ordinary cast i...

AI Technical Summary

Problems solved by technology

[0005] However, after research by the inventor, it is found that due to the need to add water seals and bushings or cylinder liners in the pump body, the pump casing is also split into a left pump casing and a right pump casing, making its structure more complicated and its durability The degree of wear is limited to the pump body, while other parts have not yet reached the wear-resistant requirements, such as the pump casing, shaft, especially the pump blades and pump body, which are damaged very quickly, and generally need to be replaced in 1 to 2 months. Therefore, people are eager to design a high wear-resistant and corrosion-resistant sand pump. However, if the material hardness of the sand pump is too high, parts such as the pump body, pump blades, pump casing and shaft that require high precision It is also difficult to cut, so cutting and hardness are always an irreconcilable contradiction

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