Mask ear band length detection device and qualification degree determination method

The invention provides a mask ear band length detection device and a qualification degree determination method. The mask ear band length detection device is composed of two groups of first sliding blocks and second sliding parts which are symmetrically arranged, first sliding parts and second sliding parts are connected through springs, and the two first sliding blocks pull the two second sliding parts to move towards two separated sides; and two groups of first sensors and second sensors are further included, and the first sensors and the second sensors are located on the outer sides and the inner sides of the two second sliding parts correspondingly. According to the mask ear band length detection device and the qualification degree determination method, the allowable fluctuation range of the detection length of the ear band is set through the two groups of sensors, the ear band is elastically stretched through each spring, and compared with existing fixed value stretching detection, the mask ear band lengt