Automatic flow control device of sand mixer

The utility model discloses an automatic flow control device of a sand mixer, which relates to the technical field of sand mixers and comprises a feeding box, the top of the surface of the feeding box is fixedly connected with a feeding hopper in a penetrating manner, one side, far away from the feeding hopper, of the bottom of the surface of the feeding box is fixedly connected with a discharging channel in a penetrating manner, and a constant-speed propelling mechanism is arranged in the feeding box. The moving mechanism is arranged to drive the two sets of push rods to move, the push rods push the rotating plates to rotate, and therefore the size of an opening between the two sets of rotating plates can be changed; besides, the sand conveyed into the feeding box through the feeding hopper can be conveyed to the position of the discharging channel through the constant-speed propelling mechanism, so that the flow of the sand is controlled by controlling the conveying speed of the sand and the size of the flo