Key Points for Buying and Using a Used White Rice Grading Machine

Many rice processors, when expanding capacity, consider buying used white rice grading machines and grain cleaning machines, such as the common MMJP series rotary white rice grading equipment. Used equipment is affordable, but the waters are deep. Today let's talk about the principles of these machines and the tricks of buying and using them.

What a white rice grading machine does

After paddy rice is hulled and milled, the white rice is mixed with broken grains, immature grains and so on, which directly affects its appearance and price. The job of a white rice grading machine is to use the principle that rice grains of different shapes and thicknesses travel along different paths on the sieve surface, separating whole rice, large broken grains and small broken grains through multiple layers of sieve plates with holes of different sizes, so they can be packaged and sold by grade. The clearer the grading, the better the head rice rate sells, and the broken rice can be used for other purposes without waste.

What to check when buying used equipment

First, look at the sieve mesh and sieve frame. The sieve surface is a wear part, so focus on whether the sieve holes are deformed, enlarged or damaged, whether the joints of the sieve frame are loose, and whether the mesh is slack. If the sieve holes are worn beyond the allowable range, the rice grades separated out will be inaccurate.

Second, look at the transmission and bearings. Run it idle and listen for abnormal noise or obvious vibration, and check whether the bearing areas heat up or leak oil. If the rotary mechanism and eccentric transmission parts are badly worn, later repair costs will not be low.

Then check the frame for rust and the motor condition. Ask the seller to provide the original purchase receipt and information on years of use, and it is best to test the machine on site with material to see the actual grading effect at the rice outlet. On price, ask around about local market rates for reference; also a reminder: agricultural machinery purchase subsidies vary by region, and whether used equipment is covered and exactly how much the subsidy is should be based on the policy published by the local agricultural machinery authority, so do not trust verbal promises.

Notes on daily use and maintenance

Before starting, check the sieve surface for foreign objects jamming it and whether fasteners are loose; feed material evenly and steadily, because a flow that surges and drops will disrupt the distribution of material on the sieve surface and affect grading accuracy. During operation, clean the sieve surface regularly to prevent broken rice and bran powder from clogging the holes.

The sieve mesh is a consumable part, so replace it promptly with one of the same specifications when damaged, and do not make do with it. After processing each season, clean out the leftover material inside the machine, protect it from moisture and rust, and add lubricating grease to the bearings regularly as required by the manual. Always cut the power before inspection and cleaning; safety comes first.

Overall, a used white rice grading machine is not something you cannot buy; the key is to keep your eyes open when choosing and maintain it according to the rules. Pick the right equipment, and you can get rice grading done properly without spending much.