Height-adjustable conveying device for coal mining

The utility model relates to the technical field of coal mine transportation, in particular to a height-adjustable conveying device for coal mining, which comprises a fixing plate, an angle adjusting component is arranged at the top of the fixing plate, and the angle adjusting component comprises a hinge seat, a top plate, a gear, an inclined plate, an air cylinder and a rack; a hinge seat is fixedly arranged on one side of the top of the fixing plate, the fixing plate is rotationally connected with a top plate through the hinge seat, an air cylinder is installed on the side, away from the hinge seat, of the fixing plate, the output of the air cylinder is connected with a rack, a gear meshed with the rack is rotationally connected to the top of the fixing plate, and an inclined plate is fixedly arranged on one side of the gear. When the angle of the conveying assembly needs to be adjusted, the air cylinder pushes the rack to slide, due to the fact that the rack is meshed with the gear, the rack slides to enab