Loading machine pumping valve and casting method thereof

Abstract

The invention discloses a casting method of a loading machine pumping valve. The casting method is characterized by comprising the following steps that core making includes mud core casting, mud coreassembly and mud core coating, a mud core is cast by adopting special mud core sand, a triangular special core support is adopted during mud core assembly, the assembled mud core is put in a sand boxfor pouring during pouring, and the sand box adopts a double-layer film-coated sand cover plate provided with a sand mold exhausting system. The invention also discloses the loading machine pumping valve. A valve body is internally provided with a first flow pass, a second flow pass, a third flow pass, a fourth flow pass, a first cavity and a second cavity, the first cavity is communicated with the first flow pass and the second flow pass, and the second cavity is communicated with the third flow pass and the fourth flow pass. The pumping valve body cast by adopting the casting method has theadvantages that the defects of air holes, shrinkage porosity, cracks and the like do not exist, no breakage is produced in the inner cavity of the valve body, and the outer surface of the valve body is uniform and consistent in roughness.

Description

technical field [0001] The invention relates to the field of a valve body and a casting method thereof, in particular to a loader pumping valve body and a casting method thereof. Background technique [0002] Although my country is currently a big country in construction machinery manufacturing, the industry is large but not strong. The production capacity of middle and low-end products is overcapacitated. Almost all high-end hydraulic components rely on imports. major bottleneck. At present, there is still a big gap between the overall manufacturing technology level of my country's hydraulic parts industry and the international advanced countries. [0003] Casting is the process of pouring smelted metal liquid into the mold, cooling and solidifying to obtain the required shape and performance of the parts. Casting is a commonly used manufacturing method. The main process of casting includes: metal smelting, model manufacturing, pouring solidification and demoulding cleanin...

AI Technical Summary

Problems solved by technology

Most of the loaders are equipped with a pumping valve body, which is a key component in the construction machinery system of the pumping valve system. The internal flow channel of the pumping valve body casting is complicated, the oil inlet is small and the inner cavity is large, and there are almost no flow channels in the inner cavity. The support point makes the inner cavity prone to fractures, pores and other casting defects, resulting in leakage of the valve body under pressure, and the defects of pores and bubbles on the outer surface of the valve body casting

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