Belt flywheel capable of being quickly disassembled, assembled and replaced

The utility model discloses a belt flywheel capable of being rapidly disassembled, assembled and replaced, relates to the technical field of belt flywheels, and aims to solve the technical problem that in the prior art, a traditional belt flywheel cannot achieve rapid and flexible sealing, fastening and assembling effects according to replacement requirements. An external pressure-bearing protection assembly is arranged in the belt flywheel body, a detachable sealing fastening assembly is arranged on the inner side of the external pressure-bearing protection assembly, an internal protection quick-assembly assembly is arranged on the inner side of the detachable sealing fastening assembly, and the interior of the external pressure-bearing protection assembly comprises a flywheel separable outer gear ring shell which is circularly arranged. A double-U-shaped gear groove is formed in the outer teeth of the flywheel separable outer gear ring shell, a U-shaped drainage and pollution discharge groove is formed in t