Main shaft of industrial robot

The robot spindle comprises a base, a big arm and a rotating arm, the rotating arm is arranged above the base, and the big arm is rotatably connected with the side face of the rotating arm; a rotatingmotor, a speed reducer and a chassis are arranged in a hollow inner cavity in the rotating arm, an output shaft of the rotating motor is coaxially connected with an input shaft of the speed reducer,an output shaft of the speed reducer is connected with the chassis, and the chassis is connected with the base. A direct connection combination of a rotating motor and a speed reducer is arranged in ahollow inner cavity of a rotating arm; the space occupied by the connecting part is reduced, an output shaft of the speed reducer is fixedly connected with the base through the chassis, a shell of the rotating motor is connected with the rotating arm, the rotating motor is inverted, equipment such as a motor connecting wire is connected to the outer side through a hollow inner cavity of the rotating arm, and the rotating m