Hardness automatic detection device and method

The invention provides an automatic hardness detection device. The automatic hardness detection device comprises an electric push rod, a hardness sensor and a digital display control panel, the electric push rod comprises a driving motor, a telescopic assembly and a reduction gear assembly, the driving motor and the telescopic assembly are both installed on one side of the reduction gear assembly, the telescopic assembly comprises a shell and a telescopic rod, the shell is provided with a containing cavity, and the telescopic rod is arranged in the containing cavity. The telescopic rod can be contained in the containing cavity or extend out of the containing cavity under the synergistic effect of the driving motor and the reduction gear assembly. The hardness sensor is installed at the end, extending out of the containing cavity, of the telescopic rod. The digital display control panel is in communication connection with the hardness sensor, the hardness sensor is used for sensing hardness and sending sensed