High-capacity screw feeding device of injection molding machine

The utility model discloses a high-capacity screw feeding device of an injection molding machine. The high-capacity screw feeding device comprises an upper template, the device is characterized by further comprising a counterweight assembly mounted on the charging barrel fixing plate, a multi-stage sealing assembly arranged on the pressing cylinder connecting flange and a material shortage alarm mechanism mounted on the pressing cylinder. Through the arrangement of the counterweight assembly, the weights of the two sides of the charging barrel fixing plate are kept balanced, and deflection caused by center imbalance after raw materials are filled due to the large capacity of the storage cylinder is avoided; through the arrangement of the multi-stage sealing assembly, the connection tightness between the material pressing cylinder connecting flange and the inner wall of the material storage cylinder is improved, so that the sealing performance is improved, leakage caused by poor sealing performance is prevente