Online filtering and metering device for cement grinding aid

The utility model discloses a cement grinding aid on-line filtering and metering device which comprises a pipe body, a first connecting flange, a continuous filtering assembly, a blockage cleaning assembly and a flow measuring and stretching assembly, the left end of the pipe body is fixedly connected with the first connecting flange, and the continuous filtering assembly is installed on the upper left portion of the outer surface of the pipe body. A second motor drives a taper gear and a gear to rotate, so that the rack on one side ascends, the rack on the other side descends, the racks drive the filter screens to ascend and descend, one of the two layers of filter screens conducts filtering all the time, and the two layers of filter screens conduct filtering all the time. When the filter screens are blocked, the second motor rotates reversely, and the heights of the filter screens on the two sides are adjusted, so that the filter screens can stably and well execute the filtering work, and when the filter sc