Downward locking device for transport trolley of photovoltaic module cleaning robot

The utility model discloses a downward locking device for a transport trolley of a photovoltaic module cleaning robot. The transportation track is arranged on one side of each row of photovoltaic modules; the photovoltaic module is parallel to the edge of the photovoltaic module; the conveying trolley carries the sweeping trolley and walks on the conveying rail. A plurality of locking rail framesare arranged on the inner side of the transportation rail; four sets of vehicle-mounted locking devices are arranged on the transport trolley; the downward locking device comprises a vehicle-mounted locking device and a locking rail frame; the utility model has a reasonable structure, by means of the first locking device, the second locking device, the third locking device and the fourth locking device which are internally provided with the longitudinal lead screw locking columns, the longitudinal locking function of the transport trolley is achieved, the problem that the transport trolley slides due to the gravity ef