Cover plate device and using method thereof

The invention relates to the technical field of electric power equipment, in particular to a cover plate device and a using method thereof.The cover plate device blocks an opening in the upper end of a pipe shaft and comprises a mounting part, an inflation rubber gasket and a negative pressure mechanism, and the mounting part is provided with a containing space; the inflatable rubber gasket is arranged on the peripheral side of the mounting part, the outer side face of the inflatable rubber gasket can abut against the inner wall of the piping shaft, the negative pressure mechanism is arranged in the containing space of the mounting part, the negative pressure mechanism is communicated with the piping shaft through a first air guide pipe, and the negative pressure mechanism is communicated with the inflatable rubber gasket and the outside atmosphere through a second air guide pipe. Through the arrangement, a closed, negative-pressure and low-oxygen environment is formed in the piping shaft, small animals such