Fixing mechanism for door opening

The fixing mechanism comprises a water tank, the left side of the top of the water tank is communicated with a water adding pipe, the top of the water adding pipe is in threaded connection with a threaded cover, a dust collecting cavity is formed in the right side of the top of the water tank, and U-shaped grooves are formed in the front end and the rear end of the center of the top of the water tank. The top of the left side of the inner wall of the U-shaped groove is fixedly connected with a partition plate. Through mutual cooperation of the U-shaped groove, the partition plate, the elastic clamping plate, the limiting groove, the U-shaped rod, the limiting fixing block, the dust door cover plate body, the clamping groove, the V-shaped buckle, the rotating shaft, the bearing and the protective pad, the dust door cover plate has the advantages that the dust door cover plate is convenient to fix and use by a user, when the dust door cover plate is opened, the dust door cover plate can be effectively fixed, an