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This invention discloses a biological cleanroom assembly mechanism and its usage method, belonging to the field of biological cleanroom assembly technology. It includes an operating table with a sliding movable platform, clamping mechanisms sliding on both sides of the operating table, and a rotatable cleaning mechanism on the operating table. A clamping plate is slidably mounted on the operating table. The cleaning mechanism includes a rotating long plate with several scrapers and roller brushes rotatably mounted on it. A liquid storage tank slides below the scrapers and roller brushes on the rotating long plate. This invention, by providing movable clamping plates with adjustable spacing, can clamp the cleaning box of the biological cleanroom, facilitating its assembly and cleaning. Simultaneously, the clamping plates can also clamp the mounting side plates, facilitating their assembly. After assembly, the clamping plates can act as push plates, pushing the assembled device out of the designated area. The clamping plates have different functions in different usage scenarios.

The folding chair comprises a backrest rod and a sliding armrest, the sliding armrest is provided with a cavity, a sliding seat and a hydraulic rod are arranged in the cavity of the sliding armrest, the first end of the hydraulic rod is connected with the sliding armrest, the second end of the hydraulic rod is connected with the sliding seat, and the hydraulic rod drives the sliding armrest to move relative to the sliding seat when stretching out and drawing back. The backrest rod connected with the sliding armrest rotates relative to the seat rod to adjust the angle of the chair back. The operation knob is embedded in the front end of the armrest, and the valve opening pin is directly or indirectly pushed to act by shifting the operation knob, so that locking and releasing of the hydraulic rod are controlled, and the smooth and stepless chair back angle adjusting effect is achieved.