Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
  • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
  • F26B9/08—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers including agitating devices, e.g. pneumatic recirculation arrangements
  • F26B9/082—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers including agitating devices, e.g. pneumatic recirculation arrangements mechanically agitating or recirculating the material being dried
  • F26B9/087—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers including agitating devices, e.g. pneumatic recirculation arrangements mechanically agitating or recirculating the material being dried the recirculation path being positioned outside the drying enclosure

Definitions

• a screw conveyor is disposed along the central vertical axis of the drying chamber into which the bulk grain is loaded.
• the moist material is picked up from the base by the screw conveyor and is carried to the top of the screw, so that the material is caused to circulate inside the drying chamber in order to bring about movements of material which accelerate the drying process and render it uniform.
• Screw conveyors disposed vertically inside the cylindrical drying chamber have some disadvantages, one of which is connected with their bulk which limits the useful volume of the drying chamber.
• the object of the present invention is to provide an improved, high-performance drier which can make maximum use of the volume of its drying chamber. This object is achieved, according to the present invention by a drier having the characteristics set forth in
• Figure 1 is a partially-sectioned, side elevational view of a drier according to the present invention
• Figure 2 is a partially-sectioned, perspective view of a detail of the drier of Figure 1. Best mode of carrying out the invention
• the drier 1 comprises a drying chamber, generally indicated 10, which is composed of a cylindrical, main, upper portion 10a and a frustoconical, hopper-like lower portion 10b which terminates in an output opening 11 closable by a horizontal sliding shutter plate 11a.
• the chamber 10 is mounted on wheels 12 so that the drier is mobile and can be transported to the vicinity of the harvesting location where drying is performed. Beneath the output opening 11, and hence outside the chamber 10, there is a horizontal screw conveyor, generally indicated 14.
• the horizontal conveyor 14 comprises an internal screw in which it is possible to distinguish a first, central portion 14a oriented so as to transport the material coming from the output opening 11 in a radially outward direction (as indicated by the arrow A) towards the periphery of the chamber, where the screw conveyor 14 is coupled to a vertical screw conveyor 15.
• the vertical conveyor 15 extends parallel to the central vertical axis X of the chamber and extends vertically from the base of the chamber to a point situated above the top of the chamber 10. At the top of the vertical screw conveyor 15 there is an inclined outlet duct 19 along which the material which comes out of the vertical conveyor 15 can fall into the chamber 10 or to the exterior during the discharge (emptying) of the drier.
• the horizontal screw conveyor 14 is extended externally and radially beyond the point of coupling with the vertical conveyor 15, forming a second portion or outer appendage 14b; in this second portion, the spirals of the screw 14 are oriented in opposition to those of the first, central portion, that is, so as to transport material from the exterior towards the point of coupling with the vertical screw conveyor (as indicated by the arrow B in Figure 1) .
• a heating unit is also provided for producing hot air and admitting it to the drying chamber to promote evaporation of the moisture contained in the grain.
• the drier according to the present invention operates as follows .
• the moist material is loaded onto the loading conveyor 17 where it reaches the end 17a and falls by gravity into the outer appendage 14b of the horizontal screw.
• a box-like container 22 surrounds the end 17a laterally in order to direct the moist grain into the appendage 14b, preventing it from being dispersed.
• the forced supply by means of the vertical screw 15 prevents stagnation or partial rejection of the grain during the initial drying stage (moist grain) and a consequent reduction in the recirculation rate.
• the mixing and recirculation cycle then continues normally by means of the vertical conveyor 15, the upper outlet duct 19, the drying chamber 10, and the portion 14a of the horizontal screw conveyor .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Drying Of Solid Materials (AREA)
• Cereal-Derived Products (AREA)
• Polyurethanes Or Polyureas (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

Family

ID=11392256

Family Applications (1)

Country Status (8)

Families Citing this family (3)

Family Cites Families (10)

• 1998
  • 1998-06-18 IT IT98PD000154A patent/ITPD980154A1/it unknown
• 1999
  • 1999-06-04 AT AT99929143T patent/ATE267992T1/de not_active IP Right Cessation
  • 1999-06-04 AU AU46058/99A patent/AU4605899A/en not_active Abandoned
  • 1999-06-04 DE DE69917637T patent/DE69917637D1/de not_active Expired - Fee Related
  • 1999-06-04 PL PL344995A patent/PL192884B1/pl not_active IP Right Cessation
  • 1999-06-04 EP EP99929143A patent/EP1088193B1/de not_active Expired - Lifetime
  • 1999-06-04 ES ES99929143T patent/ES2221392T3/es not_active Expired - Lifetime
  • 1999-06-04 WO PCT/EP1999/003887 patent/WO1999066276A1/en not_active Ceased

Non-Patent Citations (1)

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