Real-time online detection device for turbine runner blade cracks

The invention discloses a water turbine runner blade crack real-time online detection device which comprises a seat ring, a runner arranged in the seat ring and blades arranged on the runner, and further comprises a detection mechanism which comprises a penetrating opening, a tubular groove and an annular groove which are formed in the seat ring, a detection part arranged in the penetrating opening and a blocking part arranged on the detection part; the mounting mechanism comprises a long rod arranged on the blocking part, a fixed part and an extrusion adjusting part which are arranged on the long rod, a driving part arranged on the extrusion adjusting part, and a follow-up part arranged on the driving part; the limiting mechanism comprises a supporting part arranged on the driving part, a stabilizing part arranged on the driving part and a limiting part arranged on the stabilizing part. And through the arrangement of the detection mechanism, the mounting mechanism and the limiting mechanism, the detection eq