On a farm mixing its own feed, the mill is used in short bursts: twenty minutes in the morning, twenty in the evening, and never on a clean dry day when everyone is in the field. That pattern is what breaks cheap grinders. A belt-driven unit sitting idle for months takes up slack, then slips the first time it is asked to chew through a full hopper of maize, and the output drops exactly when the feed bin is empty.
This mill avoids the belt altogether. The rotor is coupled directly to a 4 kW two-pole motor turning at 2880 rpm, so there is no pulley to align, no belt to tension and nothing to slip when the load comes on. The motor sits under the grinding chamber on a steel frame with a guard around it, and the whole unit, at 640 by 570 by 1120 mm, stands on four castors so it can be wheeled from the maize store to the mixing floor.
The hopper above it is square and tapered rather than a round drum. That shape matters more than it looks: a square opening lets a full scoop go in without spilling, and a flat-walled taper does not hold a column of material above the rotor the way a narrow round neck does. Cake meal, dried sweet potato vine, maize on the cob and broken rice all slide down instead of bridging, which is the second reason this machine keeps its rated output when the hopper is full.
Fineness is set by the screen, and three plates come with the machine: 3 mm, 5 mm and a blank plate, each 450 by 130 by 1 mm. In practice the 3 mm screen gives the fine meal wanted for chicks and starter rations, while 5 mm suits layers, growers and any mix going into a pellet press, where a slightly coarser grind helps the die grip. Changing a screen takes a few minutes with the top cover off, and the cover is a welded part, not a pressed tin lid, so it does not rattle loose.
The numbers to plan around are 600 to 800 kg/h, which is enough for a few hundred birds or a small dairy herd in one pass, and 40 kg for the machine itself. Electrical protection is a 63 A breaker in its own box with a voltage display, so a low-voltage morning is visible before the motor is switched on rather than after it has burned out.
Two habits keep the output steady. Material should be below about 14 percent moisture; cake meal above that smears across the screen instead of passing through it. And the screen should be checked for holes every few weeks, because a single split lets oversize pieces through, and those pieces are what customers find in the bag.
Zhengzhou Weiwei Machinery has built feed and farm machinery in Henan since 1980, with CE and ISO9001 certification and both single-phase and three-phase versions of its small mills. Tell us what you grind, how fine you need it and what power you have on site, and we will confirm the model and screen before shipment.
