The SPX series sand and gravel trap cyclone is used for the hydraulic DE-stone removal of corn after soaking in the corn starch factory. The main function is to remove the impurities such as stones and metals mixed in the corn before it is broken, so as to effectively protect the downstream equipment. (such as crusher, etc.) to avoid damage, because it is separated by the hydro cyclone method, it has the characteristics of high separation efficiency, large processing capacity, and small equipment footprint.