EP1088193B1 - A drier for grain and granular materials in general - Google Patents

A drier for grain and granular materials in general Download PDF

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Publication number
EP1088193B1
EP1088193B1 EP99929143A EP99929143A EP1088193B1 EP 1088193 B1 EP1088193 B1 EP 1088193B1 EP 99929143 A EP99929143 A EP 99929143A EP 99929143 A EP99929143 A EP 99929143A EP 1088193 B1 EP1088193 B1 EP 1088193B1
Authority
EP
European Patent Office
Prior art keywords
conveyor means
chamber
screw conveyor
vertical
horizontal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99929143A
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German (de)
English (en)
French (fr)
Other versions
EP1088193A1 (en
Inventor
Silvano Barbieri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agrex SpA
Original Assignee
Agrex SpA
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Filing date
Publication date
Application filed by Agrex SpA filed Critical Agrex SpA
Priority to SI9930636T priority Critical patent/SI1088193T1/xx
Publication of EP1088193A1 publication Critical patent/EP1088193A1/en
Application granted granted Critical
Publication of EP1088193B1 publication Critical patent/EP1088193B1/en
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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

  • the present invention relates to a drier for grain and granular materials in general, according to the preamble of claim 1.
  • a drier for example from US-A-3 557 979.
  • Grain is normally dried upon harvesting to prevent it from deteriorating; the present invention is for application particularly but not exclusively in the field of mobile driers which are positioned in the vicinity of the grain-harvesting areas in order to dry the grain on the spot within short periods of time.
  • a conventional drier of the type which is the subject of the invention comprises a vertical, cylindrical drying chamber, a heating unit for producing hot air, and a fan which admits the hot air to the drying chamber and circulates it to promote evaporation of the moisture contained in the grain being dried.
  • 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.
  • US 3557979 discloses a bin for drying grain having auger devices for removing the dried grain from the bin.
  • the auger devices are provided for conveying the dried grain to a central floor opening in which a further auger for conveying the grain outside the bin is provided.
  • An 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.
  • Another object of the present invention is to provide a drier which improves the circulation and mixing of the material and prevents stagnation thereof in order to achieve, within short periods of time, a high and homogeneous degree of drying of the bulk grain to be dried.
  • a further object of the present invention is to propose a drier in which the loading of the moist material to be dried is also improved.
  • a mobile drier according to the present invention for grain and other granular materials, is generally indicated 1.
  • 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).
  • the opposed portions 14a and 14b are connected by a radial blade 24 for urging the material arriving either from the right or from the left into a chamber 23 which contains the lower portion or foot of the vertical screw 15.
  • the outer appendage 14b of the horizontal screw conveyor is arranged for the loading of the moist material to be dried by means of a loading conveyor, indicated 17, which is driven by a transmission system 18 connected to the screw conveyor 14, and hence to the power take-off 16;
  • the loading conveyor 17, which is preferably also of the screw type, is arranged for receiving the as yet moist grain harvested and transporting it in the direction indicated by the arrow C, towards an end 17a which is disposed above the outer appendage 14b of the horizontal screw conveyor.
  • the loading conveyor 17 can advantageously be tilted to adopt an inactive, vertical position (not shown) for operations during which it is not required to operate, for example, for transportation or during the drying process upon completion of the loading.
  • a reduction gear for taking the drive from the horizontal screw 14 and transferring it to the vertical screw 15 is indicated 20.
  • a mixer with radial blades 21 which are spoon-shaped so as to provide both for mixing of the grain and for directing it from the exterior towards the interior in a substantially radial direction.
  • the mixer can collect all of the material falling down in order to supply it to the output opening.
  • the optional presence of conventional auxiliary scrapers (not shown), rotated about the axis of the mixer 21 and passing close to the wall of the hopper 10b, is also envisaged.
  • 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 material admitted to the horizontal screw from the exterior is transported towards the point of coupling with the vertical screw conveyor 15, where it is picked up by this vertical screw and lifted to the top thereof in order then to be discharged through the duct 19 and to fall into the upper portion of the drying chamber 10.
  • the grain inside the chamber 10 continues gradually downwards until it emerges from the lower opening 11, where it is loaded onto the central portion 14a of the horizontal screw conveyor 14 and is thus transported towards the vertical conveyor 15.
  • 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.
  • the drier according to the present invention enables maximum use to be made of the capacity of the drying chamber, considerably increasing the performance of the plant and thus reducing running costs. Moreover, there are no points of stagnation of the material and/or variations in the recirculation rate so that the drying which is achieved is homogeneous throughout the bulk material in circulation; moreover, the drying times necessary to achieve, throughout the bulk material, the degree of humidity required for optimal preservation of the material are reduced.
  • the drier of the present invention puts all of the material emerging from the output opening 11 into forced circulation, transporting it forcedly in the vertical screw conveyor 15.
  • the mixer 21 is positioned and shaped in a manner such as also to force the grain which is disposed close to the wall of the drier to slide downwards; the material disposed further towards the interior, which is more greatly affected by the drying hot-air flow is thus mixed quickly and uniformly with that situated in the peripheral portion of the chamber.
  • the mixer 21 which works in the bottom of the frustoconical portion of the drying chamber with short blades, is subject to a very low resisting torque, even in the presence of very moist grain.
  • the blade mixers also have to shift the material from the conical wall of the drying chamber in order to bring the material uniformly towards the bottom and therefore include long blades which encounter a large resisting torque.
  • the drier of the invention advantageously works with an approximately constant flow-rate with both moist and dry grain, whereas in conventional driers, the flow-rate is slower when the grain is particularly moist; an improved exchange of heat between the grain and the hot air admitted to the drying chamber is thus achieved so that all of the available heat is advantageously utilized, even in the initial stages of the drying cycle.

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)
EP99929143A 1998-06-18 1999-06-04 A drier for grain and granular materials in general Expired - Lifetime EP1088193B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9930636T SI1088193T1 (en) 1998-06-18 1999-06-04 A drier for grain and granular materials in general

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITPD980154 1998-06-18
IT98PD000154A ITPD980154A1 (it) 1998-06-18 1998-06-18 Essicatoio per cereali e materiali granulari in genere.
PCT/EP1999/003887 WO1999066276A1 (en) 1998-06-18 1999-06-04 A drier for grain and granular materials in general

Publications (2)

Publication Number Publication Date
EP1088193A1 EP1088193A1 (en) 2001-04-04
EP1088193B1 true EP1088193B1 (en) 2004-05-26

Family

ID=11392256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99929143A Expired - Lifetime EP1088193B1 (en) 1998-06-18 1999-06-04 A drier for grain and granular materials in general

Country Status (8)

Country Link
EP (1) EP1088193B1 (it)
AT (1) ATE267992T1 (it)
AU (1) AU4605899A (it)
DE (1) DE69917637D1 (it)
ES (1) ES2221392T3 (it)
IT (1) ITPD980154A1 (it)
PL (1) PL192884B1 (it)
WO (1) WO1999066276A1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004144313A (ja) * 2002-10-21 2004-05-20 Matsui Mfg Co 粉粒体材料の乾燥装置
TWI447543B (zh) * 2011-09-06 2014-08-01 Mpi Corp Grain picker with multi - take - and - letting structure and its alignment method
CN112797762A (zh) * 2021-01-11 2021-05-14 重庆裕丰米业有限公司 一种稻谷烘干装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451462A (en) * 1944-04-21 1948-10-19 Yglesias-Paz Adolfo Raul Drying apparatus for coffee beans or the like, comprising a movable agitator and gas circulating means
US3000107A (en) * 1959-02-20 1961-09-19 Edmund C Ryan Agricultural machine for transporting, drying and mixing granular material
US3040443A (en) * 1959-06-10 1962-06-26 Deere & Co Crop dryer
US3557979A (en) * 1968-11-20 1971-01-26 Warren Gene Zortman Grain drying bin
US3889388A (en) * 1970-07-17 1975-06-17 Takeda Chemical Industries Ltd Method of and device for drying small solids
US3766664A (en) * 1972-08-08 1973-10-23 K Burgin Grain circulating system
FR2289860A1 (fr) * 1974-10-29 1976-05-28 Secemia Procede et dispositifs de sechage de substances granulaires
US4065891A (en) * 1976-03-02 1978-01-03 Burgin Kermit H Rotary floor grain bin
DE2967557D1 (en) * 1979-03-07 1986-02-06 Per Ake Nilsson Apparatus for drying manure and similar residual products
FR2501352A1 (fr) * 1981-03-06 1982-09-10 Bellot Gilbert Sechoir a cereales mobile a recirculation du grain

Also Published As

Publication number Publication date
ITPD980154A1 (it) 1999-12-18
PL192884B1 (pl) 2006-12-29
ES2221392T3 (es) 2004-12-16
DE69917637D1 (de) 2004-07-01
ATE267992T1 (de) 2004-06-15
PL344995A1 (en) 2001-11-19
WO1999066276A1 (en) 1999-12-23
EP1088193A1 (en) 2001-04-04
AU4605899A (en) 2000-01-05

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