Testing method and device for gear destruction

The invention relates to testing method and device for gear destruction, belonging to the technological field of machinery non-destructive testing. The invention provides magnetic memory testing method and device capable of being engaged with the shape of gear teeth of a gear to be tested, wherein a plurality of paths of magnetic sensors are arranged on the device and simultaneously test the stress positions of the tooth surface, the tooth root and the like; a non-contact photoelectric element is adopted as a sampling triggering device; and one testing device scans once and can simultaneouslyrecord the destructive states of two tooth surfaces and the tooth root of one gear tooth. The device has the advantages of high testing efficiency and high precision and can avoid test dead zones. The invention can ensure that the testing course belongs to non-contact testing; the device has simple structure and can be singly used for testing a single gear tooth, and a plurality of testing devices can be integrated into o