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This utility model relates to the field of electrical equipment, and discloses an installation structure, a roller assembly, and a cleaning device. The installation structure is simple, enabling convenient and quick disassembly and installation of the dirt-collecting tank, with high installation efficiency. Furthermore, it exhibits good structural stability and high reliability, preventing the dirt-collecting tank from shaking or shifting after installation. This installation structure is used to install the roller assembly of the cleaning device. The roller assembly includes a bracket and a dirt-collecting tank, with the tank detachably mounted on the bracket. The installation structure includes a cover and a dirt-collecting tank limiting structure. The cover is located at one end of the dirt-collecting tank, covering and connecting to the tank, and is detachably connected to the bracket. The dirt-collecting tank limiting structure is located between the cover and the tank, limiting one end of the tank to the cover.