PORTABLE MICROHARDNESS TESTER Russian patent published in 2020 - IPC G01N3/42 

FIELD: measurement.

SUBSTANCE: invention relates to devices for investigation of structural state of surface metal layers by application of mechanical forces, namely to microhardness testers. Proposed device comprises housing accommodating core rigidly connected with indenter on iris springs. Load on the indenter is transmitted from a solenoid attached to the housing, inside which the core is placed, by supplying power to the solenoid from a programmable current source. Movement of the indenter is detected by a micro-displacement transducer consisting of an inductance coil attached to the body of the device and a metal shutter connected to the core and coaxially with the inductance coil in the field of action of its magnetic field. Power supply to the inductance coil is supplied from the reference voltage source. Core is connected to the spring suspension consisting of two coaxially connected coil springs parallel to the core axis. Free end of one of springs is connected to housing, and free end of the other - to running nut. Running nut position is adjusted by adjusting screw rotation through leadscrew and worm wheel. Counterweight equal in weight to the core with an indenter is attached to the core through a system of levers. System of levers represents a fixed axis fixed on the body of the device with hingedly connected to it equal shoulders, one of which is fixed to the core, and the second - to the counterweight. Counterweight, as well as the core, is connected to the body by iris springs. Commands for programmable current source, as well as reference voltage source are supplied via microcontroller by control and data processing unit. Data from the micro-displacement sensor are also transmitted to it.

EFFECT: high-accuracy measurement of microhardness in the range of loads on indentor of 5-100 gs in any spatial position, as well as use of the microhardness tester as a portable device.

1 cl, 2 dwg