Automatic sand discharging inspection device and method for sand supply tank of high-pressure water jet cleaning equipment

The invention discloses an automatic inspection device and method for sand discharging of a sand supply tank of high-pressure water jet cleaning equipment, the device comprises a plurality of sensors, a measuring bridge and an inspection device, and the plurality of sensors are correspondingly arranged at sand discharging ports of the sand supply tank; the measuring bridge is used for being communicated with the corresponding sensor according to the gating control of the inspection device so as to obtain the instantaneous inductance value of the corresponding sensor; the inspection device is used for controlling the measuring bridge to automatically and circularly measure the gated sand discharging ports in sequence; the instantaneous inductance value of the corresponding sensor is obtained; and the instantaneous inductance value is compared with a pre-calibrated initial inductance value of the corresponding pipe orifice, whether the corresponding sand discharging opening is blocked or not is judged according