DEVICE FOR DETERMINATION OF PHYSICAL AND MECHANICAL PROPERTIES OF HIDE Russian patent published in 1995 - IPC

FIELD: light industry. SUBSTANCE: device for determination of physical and mechanical properties of hide and other viscous-resilient materials under resonance mode of compression without their destruction has mobile element which upper part carries power coil placed into magnetic field of permanent magnet. Mobile element is positioned on center of cylindrical body in guiding bushings. Mobile element is suspended due to interaction of magnetic fields of three ring permanent magnets directed in opposition located along mobile element. Two extreme magnets are attached to body and central one is installed immobile in midpart of mobile element. Novelty of device consists in use of central ring magnet as magnetic pendulum of measurement coil. Measurement coil containing core is attached to body of device so that plane of its turns match direction of motion of magnetic pendulum and is connected to input of low-frequency amplifier which output is coupled to power coil. In low-frequency amplifier mode of self-excitation of electric oscillations is set with frequency equal to inherent resonance frequency of mechanical vibrations of mobile rod. When device is put on tested material value of resonance frequency of system grows depending on mechanical properties of tested material. EFFECT: improved functional capabilities. 1 dwg