Air screen cleaner diagram

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Processing involved three steps Step 1. Pre conditioning : Isolation of seed from plant parts with which it was harvested e. Pre cleaning Removal of external materials like trash, stones, clods which are either in larger size or lighter in weight. No pre cleaning is required for hand harvested and winnowed seeds. The machineries involved in this operation are,. Scalper It removes the larger inert matter from the seeds. If it contains a single sieve it is called as scalpers, two sieves — rough cleaners.

Air screen cleaner diagram

Seed lots received from the field are often at high moisture content and contain trash and other inert material, weed seeds, deteriorated and damaged seeds, off-size seeds, etc. Seed processing is necessary in order to dry the seeds to safe moisture level; remove or reduce to the extent possible the various undesirable material, weed seeds, other crop seeds, deteriorated or damaged seeds. Other than this the seed lot heterogeneity in its physical characters like size, colour, shape etc. The seed lot is heterogeneous due to the following reasons. The inherent qualities such as germinability and vigour are exemplified by certain physical characteristics of the seed i. In its common usage in India, seed processing refers to all the steps necessary for preparation of harvested seed for marketing, namely, handling, drying, shelling, preconditioning cleaning, size grading, treating and packaging, etc. Seed Processing Plant Layout Planning Layout plan for construction of a seed processing plant should be carefully planned to ensure that the thorough seed cleaning, upgrading, seed treatment and other seed processing operations are carried out efficiently, without mixing and damaging seed lots, with a minimum of equipment, personnel, time and at minimum cost. The following factors should be considered in planning and designing a seed processing plant:. The key to efficient plant layout is a thorough knowledge of what needs to be done, and sound planning. First, the general sequence of processes involved between the time seeds enter the processing plant and the time they are cleaned, packaged and ready for shipment, must be charted. The sequence of operations depends upon the kind of crop and the initial quality of seed lot, type of contaminants, moisture content of the seed lot, etc. The layout planner must have an intimate knowledge of the seed to be processed, its physical characteristics, the contaminants in it, and also of the selection of machines used to bring the seed to acceptable marketing standards. Seed Processing Plant Building Layout Seed processing plant building will comprise of following components:.

It consists of the following parts A hopper in the top for seed filling A flutted roller below the hopper to regulate the seed flow to the screen. The seed are then discharged from mixing chamber and brought into contact with a powerful magnet, which removes the iron coated seeds. Seed that differs in colour is detected by the photo cells, air screen cleaner diagram, which generate an electric impulse.

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Screens have been used for centuries to size product and help remove contaminants as it was faster than hand picking. Screen separate by size, typically by width or thickness. Screens can perform three functions, scalp, sift and grade. Scalp screens allow the desired product to fall through the screen, but overwidth or thick contaminants are kept on top of the screen. Sift screens allow the undersized contaminates to fall though the screen but keep the desired product on top of the screen.

Air screen cleaner diagram

VX Series Pre-Cleaners. Power, kw hp. Up to 7. Up to 10 Up to 25

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Shelling Pre cleaning Removal of external materials like trash, stones, clods which are either in larger size or lighter in weight. The seeds are then rolled and passed through air column, where they are relived of the light chaffy and other materials by the blowing air. Processing involved three steps Step 1. Precautions in handling processing equipment All machine adjustments like the speed, oscillation and duration should be perfect. Based on electrical properties removes Johnson grass from sesamum seeds Specific utility. Separation based on colour is necessary because the density and dimensions of discoloured seed are the same as those of sound seed, so other machines are not effective for separation. It is essentially the same as scalping but more refined. Physical characteristics normally used to separate seeds are size, shape, length, weight, colour, surface texture, affinity to liquids, electrical conductivity, etc. Download this lecture as PDF here. All indents in a cylinder are the same size, only the progressively declining amount of material to be lifted causes this difference in separating action. Sunflower thresher For removal of seeds from the head 9. Provision for firefighting equipment such as extinguishers, water buckets, sand buckets etc. Separation of mustard, rape, soybean and peas from wheat, flax, oats, etc. Slope or inclination of the screen The angle of inclination of the screens can be adjusted according to the nature of seeds. Indented cylinder This helps to separate seeds according to the length.

Powerful fans with enough air volume for the toughest application. Independently adjustable air volume control on each air system.

The platform will be connected to processing shed through a rolling shutter. Size grader : Based on size it can be separated with air screen cleaner cum 2. This enables the air-screen machine to use three cleaning elements: aspirator, in which light material is removed from the seed mass; scalper in which good seed are dropped through screen openings; but larger material is carried over the screen into a separate spout; and grader, in which good crop seed ride over screen openings, while smaller particles drop through. Analysis of Operation a Processing sequence: After the machines needed have been identified, the next step is to determine the proper processing sequence. Adjustments Flutted roller The speed of this roller can be adjusted so as to increase or decrease the flow of seeds to the hopper of the sieves. In most cases a number of sieves with different sized perforations are used and the cleaning is a process of gradually shifting out smaller particles. No factor other than seed length and shape affects its separation. It is for removal of weed seeds and to improve the general appearance of seed. Height will be kept to facilitate installation of the seed processing equipment and machinery. Since seeds contains no free iron and are not attracted by a magnet they must be selectively pretreated with a magnetic material such as finely ground iron powder. Vibratory separator Removal of weed seed The unit consists of a vibrating or rotating screen or sieve having perforation large enough to allow the rough seed pass through readily.