Developing roller convenient to integrally replace

The utility model discloses a developing roller convenient to integrally replace, and relates to the technical field of printers. Positioning blocks are placed at the bottoms of the two ends of the developing roller body, arc-shaped supporting blocks are fixedly connected to the two sides of the positioning blocks, the tops of the arc-shaped supporting blocks make contact with the bottoms of the first bearing and the second bearing, through holes are formed in the middles of the positioning blocks, limiting grooves are formed in the through holes, and the limiting rings are slidably connected to the interiors of the limiting grooves. And a fixing mechanism is arranged on the surface of the positioning block. The two ends of the developing roller are placed on the positioning blocks and are in sliding connection with the limiting grooves through the limiting rings, so that the developing roller cannot deviate during rotation, the developing roller rotates in the positioning blocks through the through holes, th