Load measurement sensor and drilling load measurement sensor with construction machinery

摘要

PURPOSE:To enable permanent construction of equipment comprising a title sensor, an exciting coil power source and a detection processor by arranging an exciting coil and a detection coil both wound separately through a total of four through holes provided on a strength member of a ferromagnetic body. CONSTITUTION:A strength member 1 of a ferromagnetic body is provided with an exciting coil 3a wound through two through holes 2 provided on a member surface thereof and a detection coil 3b wound through other two through holes 2 crossing the coil. Then, when a load F is applied on the member 1, an easy-to- magnetize axis 4a of the member 1 changes according to a level thereof and a magnetostriction develops as shown by 4b, which causes a leakage magnetic flux in a flux generated in the coil 3a. The leakage flux is detected with the coil 3b to allow detection of a level of the load F. The coils 3a and 3b wound crossing each other are free of peeling, thereby enabling the permanent application as sensor even in a machine with vibration and fouling exceedingly.