Multi-layer structure belt pulley

The utility model discloses a multi-layer structure belt pulley which comprises a first belt pulley body, a second belt pulley body is installed on one side of the first belt pulley body through bolts, a connecting frame is arranged on the other side of the first belt pulley body, the first belt pulley body and the second belt pulley body each comprise a fixing disc, and connecting discs are integrally formed outside the fixing discs. A supporting disc is integrally formed outside the connecting disc, a limiting disc is integrally formed outside the supporting disc, a mounting groove is formed in the outer wall of the limiting disc, the first belt wheel body, the second belt wheel body and the connecting frame all comprise cast iron, a reinforcing layer is arranged on the surface of the cast iron, and a heat insulation layer is arranged on the top of the reinforcing layer. The belt pulley has the beneficial effects that the surface of cast iron in the belt pulley can be reinforced and insulated, the surface c