Patent ID: 8742751

Claim:
A magnetic field measuring device, comprising: a support base for supporting a magnet to be tested; a measuring mechanism positioned on the support base, the measuring mechanism comprising: a mounting plate substantially perpendicularly connected to the support base; a swing arm rotatably positioned on the mounting plate; a connecting member securely connected to a top end of the mounting plate; a connecting shaft, one end of the connecting shaft slidably connected to the connecting member, the other end of the connecting shaft screwed with the swing arm; an elastic member sleeved on the connecting shaft, opposite ends of the elastic member resisting the connecting member and the swing arm, respectively; a measuring magnet connected to the swing arm, facing the support base; and a displacement sensor positioned on the support base, opposite to the swing arm, wherein the magnet to be tested is positioned on the support base opposite to the measuring magnet, when the swing arm rotates by a magnetic repelling force generated between the magnet to be tested and the measuring magnet, the connecting shaft slides relative to the connecting member, the swing arm and the connecting shaft cooperatively form an acute angle, and the elastic member is in a compressed state.