Hydraulic pipe shrinking machine, including a box body, which is equipped with a hydraulic control system, a hydraulic cylinder, a pipe shrinking mold, and a material returning mechanism. The hydraulic control system controls the hydraulic cylinder, which is connected to the pipe shrinking mold. The front end of the box body is equipped with a fixed plate, and a sliding sleeve is installed on the fixed plate. The sliding sleeve is equipped with a positioning shaft, and the pipe shrinking mold includes an outer mold and an inner mold. The outer mold and the outer mold are coaxial and set on the outer side of the inner mold, and both the inner and outer molds divide the circular ring block into four equal parts, Each equally divided block is driven to gather or separate by different hydraulic cylinders, with sliding sleeves extending from both ends of the positioning shaft. One end of the positioning shaft is connected to the shrink tube mold, and the inner mold is set on the outer circumference of the other end of the positioning shaft. The material returning mechanism is fixed on a fixed plate, and the sliding sleeve can extend out to exit the circular tube outside the inner film. The inner and outer molds of this utility model both use four equally divided rings, and each of their four parts is controlled by different hydraulic cylinders, While achieving clamping, the pipe shrinking action is completed, with a simple and compact structure and a small footprint
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