Gear reducer applied to petrochemical smelting

The utility model discloses a gear reducer applied to petrochemical smelting. The gear reducer comprises an equipment whole body, according to the speed reducer, circulation of air in the protective shell can be accelerated through the first cooling mechanism, heat dissipated by the speed reducer body can be exhausted through the first filter layer through cooperative use of the exhaust fan, and therefore the purpose of cooling the speed reducer body is achieved, external dust can be prevented from entering the speed reducer body in the cooling process, and the service life of the speed reducer is prolonged. By means of the second cooling mechanism, the temperature sensor can transmit the temperature in the protective shell to the control panel through the controller, and therefore a worker can know the temperature in the protective shell through the control panel; and through cooperative use of the cooling fan, the cooling fan accelerates evaporation of spray, so that the purpose of evaporation heat absorpti