Passive adaptive multifunctional detection device for nuclear fuel assembly

The invention provides a passive adaptive multifunctional detection device for a nuclear fuel assembly. The detection device includes an oxide film thickness detection mechanism, a probe flexible feeding mechanism and a deformation detection mechanism. The deformation detection mechanism is in contact with the to-be-detected nuclear fuel assembly. The probe flexible feeding mechanism is in rigid connection with the oxide film thickness detection mechanism and the deformation detection mechanism separately. The oxide film thickness detection mechanism includes a probe spline groove, a spline slide block, an eddy current probe, a guide wheel support and a guide wheel. The deformation detection mechanism includes a mounting housing, an end cover, an outer rotary rack, an inner rotary rack, apedestal, a connection rod, an LVDT sensor and a sleeve. The device is simple and compact in structure, convenient in mounting, good in sealing performance, can adapt to different transformation and attitudes of fuel rods, ca