Combined type ring groove mill

The utility model provides a combined type annular groove mill, which comprises a top cap, a chassis, a driving shaft, immobile plates, mobile plates, iron shots, a support, a hydraulic cylinder, a hydraulic pump, and an electromotor. The immobile plates and the mobile plates are arranged in an alternate way. Annular grooves are arranged on the immobile plates and the mobile plates, and are communicated with a blanking groove. The iron shots are clamped between the annular grooves of the mobile plates and the immobile plates. The center of the top cap is provided with a material inlet. A material outlet is arranged on the lower part of the chassis. The utility model has simple structure, the deadweight of the equipment is reduced; the equipment manufacture cost is significantly reduced. In addition, as material is milled into powder directly between the mobile plates, the immobile plates and the iron shots in an extrusion way, the dissipation of energy is reduced.