Cleaning km Grading

Specially designed cleaning and grading machines can improve the quality of a sample grain to a considerable extent beyond the capabilities of the winnower. There are several reasons why such high-quality grain is desirable:

1) Grain required for seed purposes should be clean and uniform;

2) Removing weed seeds means that cultivation of the growing crop will be less costly;

3) An increased yield can be obtained from using cleaned and graded grains for seed purposes;

4) Seed-drilling machines perform better when clean and properly graded seed is used;

5) You can get better prices for graded samples;

6) Removal of insects and other foreign matter during cleaning ensures better and safer storage;

A hand-operated seed cleaner constructed entirely of wood. The crank pouters a wooden-bladed fan for ■ winnowing while screens in the foreground separate seed from chaff. Cleaned seed is deposited in a drawer below. No longer being made in the United States, these machines are easy to find at farm auctions but are now gaining in value as antiques. Construction plans are available from IRRIBox 933, Manila, Philippines.

A hand-operated seed cleaner constructed entirely of wood. The crank pouters a wooden-bladed fan for ■ winnowing while screens in the foreground separate seed from chaff. Cleaned seed is deposited in a drawer below. No longer being made in the United States, these machines are easy to find at farm auctions but are now gaining in value as antiques. Construction plans are available from IRRIBox 933, Manila, Philippines.

The hand crank, gears, and a peek at the wooden fan blades of an old seed cleaner.

7) Grain that is precleaned before drying improves the efficiency of the drying machine and produces a more uniformly dried sample.

In cleaning grain or seed, the main object is to separate all chaff, straw, weed seeds, broken and inferior seeds, dust, and other assorted rubbish from the sample. (However, some of this material can be a useful by-product with commercial value.)

Most machines used for cleaning also grade the grain according to size, shape, specific grav

Two Methods of Cleaning and Grading Seed.

ity, and/or weight of the seed. Seed cleaners commoniy used on farms vary considerably in the quality of work done. The cleaner may be a very simple riddling or winnowing machine, or a complex dresser which employs a number of processes to treat or dress the grain. Some of the processes commonly used by seed cleaners are:

1) Screening over a sieve in order to remove stalks, stones, and other large roughage.

2) Separation by a blast of air, using either a winnowing or an aspirating device.

1) Uncleaned mixture leaves hopper and

2) passes across large mesh screen. 3) Large matter collects in pockets at end. 4) Mixture passes over finer meshed screens into 5) more collection pockets. 6) Fan keeps dust and fine particles moving to exit.

Four Functions Seed

1) Uncleaned mixture leaves hopper. 2) Fan blows chaff through exit hole and separates seed by weight. 3) Seed passes across different meshed screening for four grades.

3) Rotnry screens or nests of sieves usually separate the grain or seed into a number of samples according to width.

4) Indented cylinders or pockets are used to separate the sample according to length.

Some machines will simultaneously clean and grade a sample of grain or seed, while others will perform only one of these functions. They are grouped below according to the mechanism used for cleaning and/or grading.

25 of Grandpas Top Tips

25 of Grandpas Top Tips

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