Automatic drainage method of vulcanized vacuum-pumping system

The invention discloses an automatic drainage method of a vulcanized vacuum-pumping system. The automatic drainage method of the vulcanized vacuum-pumping system comprises a vacuum-pumping tank, a vulcanizing machine is connected with the upper end of the vacuum-pumping tank through a vulcanizing machine vacuum-pumping pipe, a vacuum-pumping tank vacuum-pumping pipe is connected to the upper end of the vacuum-pumping tank, and a vacuum-pumping pump is mounted on the vacuum-pumping tank vacuum-pumping pipe. The upper surface of the vacuum-pumping tank is connected with an auxiliary tank througha gas communicating pipe, a gas communicating valve is mounted on the gas communicating pipe, the lower end of the auxiliary tank is connected with the lower surface of the vacuum-pumping tank through a water communicating pipe, a water communicating valve is mounted on the communicating pipe, and an emptying valve and a blow-down valve are separately mounted on the upper surface and the lower surface of the auxiliary ta