A method of manufacturing a wear-resistant impeller of a small sand suction pump

Abstract

The invention discloses a manufacturing method for a small sand suction pump abrasion resisting impeller. The method comprises casting, machining and welding. The impeller comprises an impeller body, a seal cover, an impeller core, a transition plate, an impeller embedded ring and a seal cover embedded piece. The impeller body and the seal cover are cast through high-chromium cast iron. The impeller embedded ring and the seal cover embedded piece are manufactured through other iron alloys capable of being cut and machined and good in weldability and are embedded and cast in the impeller body and the seal cover correspondingly. The impeller core and the embedded ring are in threaded connection, and intermittent welding is conducted on the screwing positions of the end portions of the impeller core and the embedded ring. The seal cover and the transition plate are connected at the corresponding part of the embedded piece through plug welding, and finally the assembled seal cover and the assembled impeller core are subjected to angle welding line connection. By means of the manufacturing method, the manufacturing technical problem about application of high-chromium cast iron to small sand suction pump impellers is effectively solved, and the bonding strength between the impeller body and the impeller core is improved while the abrasion resistance of the impeller is improved, and machining is convenient; and impeller cracking during integral embedding and casting of the impeller core is avoided, and the service life of the impeller is prolonged.

Description

technical field [0001] The invention relates to a manufacturing technology of an impeller, in particular to a manufacturing technology of a wear-resistant impeller for a small sand suction pump. Background technique [0002] With the acceleration of urbanization, the demand for construction sand is also increasing. At present, small sand dredging ships operating in small and medium-sized rivers are the most important equipment for providing sand for construction, and sand suction pumps are one of the key equipment for sand mining. As the core component of the sand suction pump, the impeller has very harsh service conditions and is often subject to severe wear and impact from sand and gravel, making it easy to wear. [0003] In order to facilitate processing, most of the existing small sand suction pump impellers are made of cast alloy steel materials with good mechanical processing performance but poor sand wear resistance, resulting in fast impeller wear and short life, re...

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Problems solved by technology

[0003] In order to facilitate processing, most of the existing small sand suction pump impellers are made of cast alloy steel materials with good mechanical processing performance but poor sand wear resistance, resulting in fast impeller wear and short life, requiring frequent replacement and maintenance, which seriously affects Sand mining efficiency and sand mining cost

[0004] There are also some sand suction pump impellers that adopt the method of integrally casting the wheel core on the main body of the high-chromium white anti-wear cast iron impeller to meet the requirements of wear resistance and machinability of the impeller at the same time, but when the size of the impeller is small, this method will As a result, the casting shrinkage resistance of the wheel core to the main body of the impeller is too large, resulting in low bonding strength between the two, and the impeller is easy to crack. Therefore, this method is not suitable for manufacturing small sand suction pump impellers

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