Abstract: A drainage device for draining liquid out of a closed chamber includes a main body, a piston assembly, and a transmission assembly. The main body defines a receiving chamber and a liquid inlet communicating with the receiving chamber to the closed chamber. The piston assembly is fixed in the receiving chamber of the main body. The transmission assembly is partially received in the receiving chamber. The transmission assembly and the piston assembly cooperatively separate the receiving chamber to a first chamber adjacent to the liquid inlet and a second chamber away from the liquid inlet. The transmission assembly is slidably received in the receiving chamber, thereby causing air pressure differences between the first chamber and the second chamber, to pump the liquid from the closed chamber to the second chamber. The main body further defines a plurality of discharge holes for draining liquid out of the second chamber.

Abstract: A waxing device is used for applying a waxing treatment to a polishing wheel, and includes a supporting assembly, an adjusting assembly, a driving mechanism, a mounting assembly, a motor, a wax block and a resisting mechanism. The supporting assembly includes a sliding rail, and the adjusting assembly is slidably positioned on the sliding rail; the driving mechanism is mounted on the adjusting assembly; the mounting assembly includes a mounting member positioned on the driving mechanism; the motor is mounted on mounting member; the wax block is positioned on the motor and rotated by the motor; the resisting mechanism is positioned on the supporting assembly and resists the adjusting assembly for adjusting a pressure applied to the polishing wheel during the waxing process.

Abstract: A waxing device is used for applying a waxing treatment to a polishing wheel, and includes a supporting assembly, an adjusting assembly, a driving mechanism, a mounting assembly, a motor, a wax block and a resisting mechanism. The supporting assembly includes a sliding rail, and the adjusting assembly is slidably positioned on the sliding rail; the driving mechanism is mounted on the adjusting assembly; the mounting assembly includes a mounting member positioned on the driving mechanism; the motor is mounted on mounting member; the wax block is positioned on the motor and rotated by the motor; the resisting mechanism is positioned on the supporting assembly and resists the adjusting assembly for adjusting a pressure applied to the polishing wheel during the waxing process.

Abstract: A drainage device for draining liquid out of a closed chamber includes a main body, a piston assembly, and a transmission assembly. The main body defines a receiving chamber and a liquid inlet communicating with the receiving chamber to the closed chamber. The piston assembly is fixed in the receiving chamber of the main body. The transmission assembly is partially received in the receiving chamber. The transmission assembly and the piston assembly cooperatively separate the receiving chamber to a first chamber adjacent to the liquid inlet and a second chamber away from the liquid inlet. The transmission assembly is slidably received in the receiving chamber, thereby causing air pressure differences between the first chamber and the second chamber, to pump the liquid from the closed chamber to the second chamber. The main body further defines a plurality of discharge holes for draining liquid out of the second chamber.