Hollow blade diameter-gradually-changing type drying machine

The drying machine comprises a machine body and a motor, a top cover is arranged at the top of the machine body, a feeding port is formed in the top cover, a sealing cover is arranged in the feeding port, an inner cavity is formed in the machine body and the top cover, side doors are rotationally connected to the two sides of the machine body, and a first chain wheel is fixedly installed at the output end of the motor; a second chain wheel is arranged at one end of the machine body, the first chain wheel and the second chain wheel are both meshed with the chain, a shaft rod of the second chain wheel penetrates through the machine body, a first paddle is installed on the shaft rod of the second chain wheel, a first gear is arranged on one side of the second chain wheel and meshed with a second gear, and a shaft rod of the second gear penetrates through the machine body. And a second paddle is mounted on a shaft rod of the second gear. According to the drying machine with the hollow blades and the gradually-cha