Mechanical Grain Conveying
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Mechanical Grain Conveying
Mechanical Grain Conveying
45261Agricultural and Biosystems Engineering Department Iowa State University12/07.06Carl J. BernChapter 12 Mechanical Grain ConveyingINTRODUCTIONMate Mechanical Grain Conveyingerial handling is a unit operation which changes the spacial location of material without changing its form except incidentally (Pinches, 1958). Material handling operations with grain involve many types of grain conveying devices. These types of mechanical grain conveying devices will be discussed Mechanical Grain Conveyingin this chapter:•Belt conveyors•Flight conveyors•Bucket conveyors•Screw conveyorsThese devices all find wide use in agriculture, and are very interestMechanical Grain Conveying
ing from an engineering point of view.hnpotmn design faciorsImportant design factors of material handling equipment are:•Capacity•Safety•Reliability•O45261Agricultural and Biosystems Engineering Department Iowa State University12/07.06Carl J. BernChapter 12 Mechanical Grain ConveyingINTRODUCTIONMate Mechanical Grain ConveyingirementsThe importance of each factor depends on the application. Cleanability is important for a seed conveyor when seed left in the conveyor will be mixed with the next grain conveyed. It is of no importance in a farm design where the only material handled is com for feed. Product damage is import Mechanical Grain Conveyingant in a conveyor loading grain to be marketed since an increase in fine material could result in a lowered value. It has a low priority for a conveyoMechanical Grain Conveying
r loading a grinder.Energy considerationsAs noted above, power requirement (energy) is an important consideration in the design of a conveyor. Much mo45261Agricultural and Biosystems Engineering Department Iowa State University12/07.06Carl J. BernChapter 12 Mechanical Grain ConveyingINTRODUCTIONMate Mechanical Grain Conveying operate the conveyor•To lift material45262The quantity of energy expended operating a conveyor is dependent on the conveyor design and is something to consider as conveyors are compared. The energy expended in lifting material represents an increase in potential energy of the material mass and Is n Mechanical Grain Conveyingot dependent on conveyor design. If the conveying path is horizontal, this component is zero. If the conveying path slopes down, this energy input IsMechanical Grain Conveying
negative, meaning there can be an output of energy from the conveyor. In some cases when this output exceeds conveyorrequirements, the conveyor produc45261Agricultural and Biosystems Engineering Department Iowa State University12/07.06Carl J. BernChapter 12 Mechanical Grain ConveyingINTRODUCTIONMate Mechanical Grain Conveyingn losses. In this conveyor, the energy to operate the convey or is zero. No actual conveyor can operate without friction. However, it is useful to compare actual conveyors with a perfect conveyor doing the same job.Power for a perfect conveyorFigure 12-1 shows forces moving a particle during conveyi Mechanical Grain Conveyingng from point 1 to point 2 along a frictionless surface.where45261Agricultural and Biosystems Engineering Department Iowa State University12/07.06Carl J. BernChapter 12 Mechanical Grain ConveyingINTRODUCTIONMate45261Agricultural and Biosystems Engineering Department Iowa State University12/07.06Carl J. BernChapter 12 Mechanical Grain ConveyingINTRODUCTIONMateGọi ngay
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