Therefore the actuator (23) of the drive unit (20) can rotate the water draining basket (35) at high speed, and the water of the mop in the water draining basket (35) can be extracted at high speed.

A water draining basket (35) with a shaft (31) is disposed in the barrel body (10).

The sliding element (25) can rotate a planetary accelerating set (26) which can rotate the shaft (31) of the water draining basket (35).