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WO1999036335A1 - Procede permettant de vider un silo destine a des produits en vrac, notamment des grains cerealiers, et transporteur d'evacuation utilise - Google Patents

Procede permettant de vider un silo destine a des produits en vrac, notamment des grains cerealiers, et transporteur d'evacuation utilise Download PDF

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Publication number
WO1999036335A1
WO1999036335A1 PCT/SE1998/002448 SE9802448W WO9936335A1 WO 1999036335 A1 WO1999036335 A1 WO 1999036335A1 SE 9802448 W SE9802448 W SE 9802448W WO 9936335 A1 WO9936335 A1 WO 9936335A1
Authority
WO
WIPO (PCT)
Prior art keywords
perforation
bands
floor
air
apertures
Prior art date
Application number
PCT/SE1998/002448
Other languages
English (en)
Inventor
Rolf Andersson
Original Assignee
Pm-Luft Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pm-Luft Ab filed Critical Pm-Luft Ab
Priority to CA002316804A priority Critical patent/CA2316804C/fr
Priority to AU20825/99A priority patent/AU2082599A/en
Publication of WO1999036335A1 publication Critical patent/WO1999036335A1/fr
Priority to US09/603,149 priority patent/US6299387B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/72—Fluidising devices

Definitions

  • the present invention relates to a method for evacuating storage spaces for bulk goods, preferably granulate material, e.g. cereal grain, by means of an evacuation conveyor constituting the floor of the silo, which is provided with perforations arranged in bands as passages for air flows, which are directed along the floor and blow the bulk material towards an outlet, an outlet chute or the like.
  • the invention also relates to an evacuation conveyor.
  • Silos for cereal grain and the like are evacuated by means of allowing the grain to flow out through an outlet in the bottom of the silo.
  • the silo bottom is conveniently arranged in a horizontal direction, resulting in the formation of a remaining residue of bulk goods, corresponding to the angle of repose of the material in question, which has its largest height at the silo walls and slopes towards the outlet or the outlets.
  • this remaining material is evacuated by means of an evacuation conveyor, which consists of a floor having a number of bands of perforations, through which perforations jets of pressurized air directed along the floor pass, and bring the bulk goods into movement towards an outlet opening or the like.
  • SE 218067 C and SE 459 575 B are examples of previously known devices of this type.
  • a disadvantage with these previously known devices is that the pressurized air locates passages in which the lowest resistance prevail, i.e. where the layer of bulk goods is the thinnest, thereby leaving the thicker portions more or less unaffected. In the positions where the pressurized air has been able to transport away the goods, empty or sparsely coated floor areas are created, and a considerable portion of the pressurized air flows out from the silo without having been effective in the displacement of the cereal grain.
  • the purpose of the invention is to achieve an evacuation conveyor:
  • FIG. 1 shows a section through a storage silo with an evacuation conveyor according to the invention.
  • Fig. 2 shows, in magnification, a portion of the floor construction.
  • Fig. 3 shows a section along the line 111-111 in fig. 1.
  • Fig. 4 shows a section along the line IV-IV in fig. 5.
  • Fig. 5 shows a top view of a portion of a deflector channel.
  • Fig. 6 shows a section along the line NI-NI in fig. 5.
  • Figs. 7, 9 and 10 show top views of a sector of the evacuation conveyor in different evacuation stages.
  • Fig. 8 is a section along the line VIII- VIII in fig. 7.
  • Fig. 11 shows a perspective view of a sector of a storage space with the evacuation conveyor according to the invention.
  • the storage space 11 shown in Figs. 1 and 3 is constituted of a concrete silo having a circular cross- section, with silo walls 12 and an essentially horizontal bottom 13, in which an evacuation opening 14 is centrally arranged.
  • an evacuation conveyor 15 is placed which covers the entire silo bottom and forms the floor 16 of the silo.
  • evacuation conveyor means a device, previously known per se, for horizontal transport of bulk goods along a floor, provided with apertures which are directed so that an air stream through these displaces the material on the floor towards the evacuation conveyor.
  • the evacuation conveyor 15 is constituted of a platform 17, arranged at a distance from the silo bottom 13 by means of legs 18, so that an air chamber 19 is formed underneath the platform.
  • This is constituted of U-beams, arranged at a distance from each other, on top of which the floor 16 itself rests.
  • the floor is diametrically divided into two halves by an open feeder chute 20.
  • an outlet 21 is arranged in the feeder chute which communicates with the evacuation opening 14 of the silo.
  • the floor 16 comprises a number of deflector channels 22, which in the shown example are constituted of U-shaped sheet metal profiles, but which also can be pipes with a rectangular cross-section.
  • the deflector channels 22 are provided with apertures 23, constituted of slits, which on one side are punched downwards from the plane of the sheet metal profile, in order to form a nozzle having a parallel trapezoidal cross-section which is directed essentially in the plane of the floor.
  • the deflector channels 22 are arranged essentially perpendicularly to the feeder chute 20, which discharges in at least one outlet 21.
  • Each deflector channel 22 is on both long sides flanked by distribution ridges 24 in the form of ridge plates, with surfaces sloping from the ridge 25 towards the deflector channels.
  • the ridge 25 is located on a higher level than the deflector and has the task of guiding the bulk material towards the deflector channels.
  • the ridge plates preferably have a minimum slope, corresponding to the angle of repose of the bulk material. As is evident from Fig.
  • the evacuation conveyor 15 is divided into sectors 26 sealed from each other, in the shown example in quadrants, wherein each sector via its respective air channel 27a-27d is connected to a source of pressurized air, e.g. a fan 28 or the like arranged outside the silo in a fan house 29.
  • a source of pressurized air e.g. a fan 28 or the like arranged outside the silo in a fan house 29.
  • a control member 30 either all sectors, or the sectors individually or in groups, can be connected to the fan.
  • the control member can be controlled e.g. by means of a processor, which intermittently connects the sectors according to a circulating scheme, wherein for example one sector during a short period of time is pressurized with the entire pressure power of the fan, alternating with periods with a lower pressure in which the air is distributed across several sectors.
  • at least portions of the perforation bands 31 formed by the deflector channels 22 which are located closest to the silo wall 12, and some of the bands along their entire and/or part of their length, have been provided with apertures 23 having a larger flow area than the apertures 23 in the remaining perforation bands 32.
  • the open feeder chute 20 is also provided with the same type of perforation 31' as the deflector channels 22, the apertures of which are directed towards the outlet 21 or, in the case of several outlets, towards one of these.
  • Fig. 3 this is illustrated in a quadrant of the evacuation conveyor, wherein the perforation bands 31 are shown with closer sectioning for apertures 23 having a larger flow area, while more sparsely sectioned perforation bands have a smaller flow area.
  • the relative difference in size between the apertures is 15- 50%.
  • the measure H i.e. the height of the slit in Fig. 5, can suitably vary between 1.8 - 2.0 mm for the larger apertures and the measure h between 1.2 - 1.4 mm for the smaller apertures.
  • the invention is not limited to the shown embodiment, but a number of variations are conceivable within the scope of the claims. Accordingly, the invention can be applied for any storage space, independently of whether it has a circular, rectangular or another cross-sectional shape. It can also be applied in such silos which have a sloping bottom, but where there is a desire to improve the evacuation efficiency. Also deflector channels which are arranged radially are conceivable, as well as bottoms with several outlet openings. LISTING OF REFERENCE NUMERALS

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Storage Of Harvested Produce (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)

Abstract

L'invention concerne un procédé permettant de vider un silo destiné à des produits en vrac, de préférence, granuleux comme des grains céréaliers, à l'aide d'un transporteur d'évacuation constituant le fond du silo. Le transporteur d'évacuation (15) est doté de perforations disposées en bandes qui permettent le passage de flux d'air. Les flux d'air dirigés le long du fond (16), soufflent la matière en vrac (22) vers une sortie (21) ou au moins vers un tuyau d'évacuation. Au moins les parties des bandes de perforations les plus proches des parois latérales (12) du silo, et certaines des bandes le long sensiblement de tout ou partie de leur longueur, cèdent un flux d'air dont la quantité et/ou la pression diffèrent de ceux des flux d'air cédés par les autres bandes de perforations.
PCT/SE1998/002448 1997-12-29 1998-12-23 Procede permettant de vider un silo destine a des produits en vrac, notamment des grains cerealiers, et transporteur d'evacuation utilise WO1999036335A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002316804A CA2316804C (fr) 1997-12-29 1998-12-23 Evacuation d'aire d'entreposage pour materiau granulaire en vrac
AU20825/99A AU2082599A (en) 1997-12-29 1998-12-23 Method for evacuating a storage silo for bulk goods, e.g. cereal grain, and an evacuation conveyor thereto
US09/603,149 US6299387B1 (en) 1998-12-23 2000-06-23 Method for evacuating a storage silo for bulk goods, E.G. cereal grain, and an evacuation conveyor thereto

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9704882A SE512659C2 (sv) 1997-12-29 1997-12-29 Sätt att tömma lagringsutrymme för bulkgods, t ex spannmål och tömningstransportör därtill
SE9704882-1 1997-12-29

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/603,149 Continuation US6299387B1 (en) 1998-12-23 2000-06-23 Method for evacuating a storage silo for bulk goods, E.G. cereal grain, and an evacuation conveyor thereto

Publications (1)

Publication Number Publication Date
WO1999036335A1 true WO1999036335A1 (fr) 1999-07-22

Family

ID=20409583

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/002448 WO1999036335A1 (fr) 1997-12-29 1998-12-23 Procede permettant de vider un silo destine a des produits en vrac, notamment des grains cerealiers, et transporteur d'evacuation utilise

Country Status (4)

Country Link
AU (1) AU2082599A (fr)
CA (1) CA2316804C (fr)
SE (1) SE512659C2 (fr)
WO (1) WO1999036335A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103434768A (zh) * 2013-07-11 2013-12-11 十堰天策专用汽车技术开发有限公司 一种粉粒物料运输车

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1432010A (fr) * 1964-03-18 1966-03-18 Silo transportable pouvant être replié
EP0084750A1 (fr) * 1982-01-15 1983-08-03 Jean Henri Lagneau Perfectionnements aux dispositifs de vidange des silos
US5224312A (en) * 1990-07-02 1993-07-06 Claudius Peters Aktiengesellschaft Venting fabric

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1432010A (fr) * 1964-03-18 1966-03-18 Silo transportable pouvant être replié
EP0084750A1 (fr) * 1982-01-15 1983-08-03 Jean Henri Lagneau Perfectionnements aux dispositifs de vidange des silos
US5224312A (en) * 1990-07-02 1993-07-06 Claudius Peters Aktiengesellschaft Venting fabric

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103434768A (zh) * 2013-07-11 2013-12-11 十堰天策专用汽车技术开发有限公司 一种粉粒物料运输车
CN103434768B (zh) * 2013-07-11 2015-10-14 十堰天策专用汽车技术开发有限公司 一种粉粒物料运输车

Also Published As

Publication number Publication date
AU2082599A (en) 1999-08-02
SE9704882D0 (sv) 1997-12-29
CA2316804C (fr) 2008-04-01
CA2316804A1 (fr) 1999-07-22
SE512659C2 (sv) 2000-04-17
SE9704882L (sv) 1999-06-30

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