A frame includes a plurality of profile sections and at least one first adapter assembly. Each profile section includes at least one section extension surface, and one of the at least one section extension surface is provided with at least one first groove therein. Each first adapter assembly includes a first position-limiting block provided with at least one first mounting hole therein. The first position-limiting block is configured to be fixed in a first groove during assembly, and to fix other components to the profile section through the at least one first mounting hole.