Dredge pump protection plate with shoulder rings

The utility model relates to the technical field of dredge pump manufacturing, in particular to a dredge pump protection plate with shoulder rings. The dredge pump protection plate comprises the annular shoulder rings and a protection plate body. The inner diameter of each shoulder ring is in clearance fit with the outer diameter of the protection plate body. The protection plate body is sleeved with the shoulder rings which are fixedly arranged on the portions, prone to abrasion, of the outer ends of the protection plate body and a dredge pump impeller. The shoulder rings and the protection plate body are fixed to a pump body through bolts respectively. The shoulder rings are made of wear-resistant white cast iron such as KmBCr26 material or KB19 material. The portions, prone to abrasion, of the protection plate body are protected by the shoulder rings, and the service life of the protection plate is prolonged. Meanwhile, the shoulder rings are replaceable, the whole protection plate can be protected by partially replacing the shoulder rings which are abraded, the replacing frequency of the dredge pump protection plate is reduced, use cost is greatly lowered, and the dredge pump protection plate is particularly suitable for large dredge pumps.