Rubber roller

The utility model discloses a rubber covered roller which comprises a roller body, a roller cylinder, a cavity, a first cooling pipe and a fastening device arranged on the roller cylinder, the rollercylinder is installed outside the roller body through a sealing structure, water permeable holes are formed in the outer wall of the roller body, and cooling liquid circulates between an inner cavityof the roller body and the cavity through the water permeable holes. According to the rubber covered roller, the roller body with the water permeable holes is adopted, so that cooling water flows alternately between the roller body and the roller cylinder, heat exchange is fully conducted through the fully flowing cooling water flows, the cooling speed is increased, and the cooling effect and efficiency are greatly improved; the roller, the riding wheel, the riding wheel shaft and the first bearing seat are combined to form a fastening device, so that the roller and the roller body have high stability, firmness and bal