The utility model relates to the technical field of
microfiltration devices, in particular to a
microfiltration device for producing
fulvic acid, which is characterized in that the outer surface of a
microfiltration cylinder is fixedly connected with a
discharge flange, a
dirt collecting net is sleeved in the
discharge flange, the inside of the
dirt collecting net is in threaded connection with a *-shaped mounting frame, and the outer surface of the *-shaped mounting frame is fixedly connected with a
nitrile rubber ring; a set of through grooves are formed in the mounting frame shaped like the Chinese character'mi ', an internal thread groove is formed in the
dirt collecting net, after impurities are blocked, along with
continuous injection of
fulvic acid liquid, the intercepted impurities naturally flow into the discharging
flange along the inclined face of the filter net under follow-up washing of
fulvic acid, the dirt collecting net is mounted in the discharging flange, and when the fulvic acid liquid is continuously injected, the dirt collecting net is prevented from being blocked. Impurities are intercepted on the dirt collecting net, after long-time use, the blocking cover is taken down, the blocking cover can be directly pulled out, when the
nitrile rubber ring slides and is taken out along with the dirt collecting net, the
nitrile rubber ring rubs the inner wall of the discharging flange, and the impurities accumulated in the discharging flange are effectively cleaned.