Device and method for detecting mechanical property of air cavity spring of annular fuel assembly

The invention relates to a device and a method for detecting the mechanical property of an air cavity spring of an annular fuel assembly. The device comprises a fixed base, a spring fixing rod and a downward-pressing gasket, the method comprises the following steps that 1, a fixing head of a fixing base is installed in a fixing hole of a spring testing machine to be fixed; 2, external threads of aspring fixing rod are installed in an internal threaded hole of a fixing base, an air cavity spring is arranged on the spring fixing rod in a sleeving mode, and then a downward-pressing gasket is placed above the air cavity spring; thirdly, the spring testing machine applies pressure downwards to press the gasket downwards, and mechanical property testing is started. According to the invention, matching butt joint with detection equipment is realized in an annular fuel assembly air cavity spring mechanical property detection project; excessive transverse bending deformation in the test process can be avoided, sample