Dust cup assembly, dust collector and dust collector assembly

The dust cup assembly comprises a cup body, a cup cover and a switching mechanism, the cup body is provided with a cleaning opening and a mounting part, and the mounting part is provided with a mounting cavity; the cup cover is arranged on the cup body; the switch mechanism is located in the mounting cavity and comprises a connecting rod and a locking piece, and the connecting rod is configured to be used for promoting the locking piece to move so that the cup cover can be located at the position for opening the cleaning opening; the connecting rod comprises a triggering part and a pushing part, the triggering part abuts against the locking piece, the pushing part is located on the side, away from the locking piece, of the triggering part, a first opening used for exposing the pushing part is formed in the outer side of the peripheral wall of the cup body, and a second opening used for exposing the triggering part is formed in the end face of the side, facing the cup cover, of the cup body. The connecting rod directly acts on the locking piece, and the function of opening the cup cover is achieved. A user pushes the pushing part on the peripheral side of the cup body, and when the dust cup assembly is placed into a base station, the base station can push the triggering part in the axial direction of the cup body, so that the base station opens the dust cup cover.