Dynamic stress testing device for shaft head of large dredge pump

The utility model belongs to the field of monitoring of dredge pump devices, and relates to a device for monitoring dynamic stress of a shaft head of a dredge pump in real time. The large dredge pump shaft head dynamic stress testing device is used for testing a dredge pump shaft head, and is characterized by comprising a strain gauge unit and a signal collector, the signal collector comprises a signal collection module; the strain gauge unit comprises a plurality of groups of strain gauges; the strain gauge units and the signal acquisition module form a plurality of groups of stress measurement circuits which are installed on the periphery of an optical axis section between a dredge pump shaft head impeller and a bearing and used for acquiring a plurality of groups of strain signals of a shaft head. According to the utility model, under the condition that the original pump shaft structure is not changed, three-dimensional stresses from different sources are respectively measured, interference factors in stra