Mixing device for preparing aluminum oxide hollow sphere bricks

The mixing device comprises a mixing shell and a filter screen, a motor is fixedly installed on the top face of the mixing shell, the output end of the motor is fixedly connected with a rotating rod, sliding grooves are formed in the left inner wall and the right inner wall of the mixing shell, sliding seats are installed in the sliding grooves in a sliding mode, and the rotating rod is fixedly connected with the sliding seats. A first mounting block is fixedly connected to the sliding seat, a mounting shell is fixedly connected to the first mounting block, a clamping rod is slidably mounted on the mounting shell in a penetrating manner, a compression block is fixedly connected to the clamping rod, a spring is slidably mounted on the clamping rod in a sleeving manner, and second mounting blocks are fixedly connected to the two ends of the filter screen. The output end of the motor drives the rotating rod to rotate, the rotating rod drives the stirring rod to rotate to stir raw materials, and the filter screen