EP0221900B1 - Verfahren zum brechen von bündeln zusammenballender hartfasern und oszillierender schirm - Google Patents

Verfahren zum brechen von bündeln zusammenballender hartfasern und oszillierender schirm Download PDF

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Publication number
EP0221900B1
EP0221900B1 EP85903418A EP85903418A EP0221900B1 EP 0221900 B1 EP0221900 B1 EP 0221900B1 EP 85903418 A EP85903418 A EP 85903418A EP 85903418 A EP85903418 A EP 85903418A EP 0221900 B1 EP0221900 B1 EP 0221900B1
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EP
European Patent Office
Prior art keywords
fibers
screen
openings
bundles
plane
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
EP85903418A
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English (en)
French (fr)
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EP0221900A1 (de
Inventor
Sven Axelsson
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.)
Vertex International AB
Original Assignee
Vertex International AB
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Filing date
Publication date
Application filed by Vertex International AB filed Critical Vertex International AB
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/404—Pre-treatment of fibres

Definitions

  • This invention is concerned with a method of breaking up bundles of adherent hard fibers, especially steel fibers, and feeding said defibered or individualized fibers to a mixing device and a vibrating screen for performing said method.
  • Swedish laid open patent application No. 7508720-5 discloses a method and a device to break up the bundles of fibers by vibrating and/or tumbling on a screen and/or in a tumbler.
  • the feed rate of the fibers to the mixer is varied by an increase or decrease of the rate of motion of the screen or tumbler and/or the discharge opening of the tumbler.
  • the fibers are oriented in a plane by falling by gravity on a vibrating table and thereafter aligned by an airstream in a transport pipe.
  • DE-A-2 523 905 and DE-A-2 337 129 both disclose a method of breaking up bundles of adherent hard fibers, particularly steel fibers, and feeding said defibered or individualized fibers to a mixing device, the method comprising vibrating said bundles of adhering fibers on an oscillating screen to obtain separated fibers, passing said separated fibers through openings of said screen, and supplying by means of gravity and oscillating force said fibers to said mixing device.
  • the purpose of the present invention is to suggest a simple method of defibering fibers obtained as bundles and of supplying the individualized fibers by gravity over a large area, said area being larger than the area of the oscillating screen, and directly to a mixing device.
  • the invention also comprises a screen for performing said method.
  • the purpose of the invention is achieved by a method according to the preamble of claim 1 in that said openings being oblong and through which openings only one fiber at a time can pass, said fibers being spread over a large area, said area being larger than the area of said screen and being part of said mixing device, separated fibers are aligned in a plane parallel to the plane of said screen thus lying horizontally when passing through opening.
  • the screen for performing the method comprises an oscillating screen according to the preamble of claim 2 wherein, said openings being oblong and having a length corresponding mainly to the length of said fibers, the width of said openings being essentially less than the length of said fibers, the plane of each opening making an acute angle relative to the plane of the screening means and the line corresponding to the longest dimension of an opening being parallel to the plane of the screen.
  • Figure 1 shows a cross section through a concrete mixer station comprising a screen according to the invention and Figure 2 shows the concrete mixer station from above.
  • the concrete mixer station of Figure 1 comprises a mixing means 1 having mixing elements which are not shown, said elements being driven by a motor 2.
  • a screen 3 is arranged on the mixing means 1, said screen has a screening means 4.
  • the screening means is given an oscillating movement by a motor 5 via an eccentric member 6.
  • Said screening means 4 has oblong openings 8, e.g. rhombic openings as shown in Figure 2.
  • the screen 3 is provided with side walls 7 to retain the fibers supplied to the screen when the screening means is moving backwards and forwards.
  • the screening means 4 covers a large area of the mixing means 1.
  • the width of the screening means is about half the radius of the round mixing tank 1.
  • the screening means has such a length that all fibers fall within the mixing tank 1.
  • the screen can of course be placed nearer the center of the mixing tank and thus having both a greater length and width.
  • the openings of the screening means must be oblong and preferably have rhomboidic shape, i.e. the openings include both rectangular and rhombic shape.
  • the shape of the openings must have such a shape that only one fiber at a time can pass through one and the same opening.
  • the largest dimension of an opening must be of the same order of magnitude as the fiber and the dimension at right angle to the longest dimension must be small such that two or more fiber sticking together can not pass through the opening.
  • a practical least dimension of a rhomboidic opening is such a length that the sum of the length of two adjacent sides is slightly greater than the length of a fiber. In that case, only fibers having a longitudinal axis forming an angle against the plane of the screening means can pass.
  • a preferable practical greatest dimension of rhomboidic openings is such a length that the sum of the length of two adjacent sides is twice the length of the fiber.
  • the width of the openings must be such that in the vast majority of cases bundles of fibers of two or more cannot pass.
  • the surface of the screening means is not even but is provided with elevations and corresponding depressions (negative elevations), i.e. the level of the top surface is having regular or non-regular variations.
  • An example of a preferred screening means is a means made of expanded metal having rhombic openings.
  • the openings of an expanded metal make an acute angle with the plane of the screening means.
  • an expanded metal screen having rhombic openings is very suitable, the openings having a greatest diagonal of 25 mm and a second diagonal of 12 mm. It is understood that the size of the openings depends on the length of the fibers.
  • the fibers are supplied in the form of bundles of fibers and of course, there are single fibers.
  • Such bundles are fed to the screen 3 via an endless chain elevator 9, said screen is placed directly over said mixing tank 1.
  • Simultaneously or preferably in advance naturally moist sand is fed to the mixing means 1.
  • the sand must not be dry. Due to the fact that the fibers pass through said screening means only one fiber at a time passes through one and the same opening, over a large area, the supply of fibers comprises many fibers per unit of time over a large area. Thus many fibers can be supplied without clogging in the mixing tank. Thanks to the fact that the screen is oscillating the fibers obtain a component of movement parallel to the plane of the screening means.
  • the mixing device 1 will distribute the fibers in the concrete before they are able to clog together. Then, or possibly simultaneously with the sand other ballast material, e.g. silicon dioxide is added. Following the ballast materials cement and thereafter water is added forming the mixed concrete. This concrete can be sprayed. This spraying orients the fibers in one direction in the concrete.
  • the sand other ballast material e.g. silicon dioxide
  • the present invention is not limited to the production to reinforced concrete but can be used in the production of other masses containing fibers, e.g. asphalt, bitumen.
  • the method is not limited to the described open mixing device but can be used with other mixing devices, e.g. screw mixing devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Producing Shaped Articles From Materials (AREA)

Claims (6)

1. Verfahren zum Aufbrechen von Bündeln harter Fasern, die aneinanderhaften, insbesondere Stahlfasern, und um diese defibrierten odervereinzelten Fasern einer Mischeinrichtung zuzuführen, bei welchem Verfahren die Bündel der aneinanderhaftenden Fasern auf einem oszillierenden Sieb vibriert werden, um getrennte Fasern zu erhalten, die getrennten Fasern durch Oeffnungen im Sieb geführt werden und diese Fasern durch Schwerkraft und oszillierenden Kräften der Mischeinrichtung zugeführt werden, dadurch gekennzeichnet, dass die Oeffnungen (8) langgestreckt sind und jeweils nur eine einzige Faser durch die Oeffnungen hindurchtreten kann, dass die Fasern über einen grossen Flächenbereich verbreitet werden, welcher Flächenbereich grösser als das Flächenmass des Siebes ist und Teil der Mischeinrichtung (1) ist, welche getrennten Fasern in einer Ebene ausgerichtet werden, die parallel zur Ebene des Siebes (4) verläuft und damit beim Hindurchtreten durch eine Oeffnung (8) horizontal liegen.
2. Oszillierendes Sieb zum Durchführen des Verfahrens nach Anspruch 1, wobei der Siebteil (4) des oszillierenden Siebes Oeffnungen (8) aufweist, durch welche die voneinander getrennten Fasern hindurchtreten, dadurch gekennzeichnet, dass die Oeffnungen (8) langgestreckt sind und eine Länge aufweisen, die weitgehend der Länge der Fasern entspricht, und eine Breite aufweisen, die beträchtlich weniger als die Länge der Fasern beträgt, dass die Ebene jeder Oeffnung (8) mit der Ebene des Siebteils einen spitzen Winkel einschliesst, und dass die gerade Linie, die der längsten Abmessung einer Oeffnung (8) entspricht, parallel zur Ebene des Siebes (4) verläuft.
3. Sieb nach Anspruch 2, dadurch gekennzeichnet, dass die Oeffnungen (8) im Siebteil (4) rhombenförmig sind.
4. Sieb nach Ansprüche 2-3, dadurch gekennzeichnet, dass der Siebteil (4) aus Streckmetall hergestellt ist.
5. Sieb nach Anspruch 2, dadurch gekennzeichnet, dass dsie Oeffnungen (8) im Siebteil (4) die Form eines Rhomboides aufweisen.
6. Sieb nach Anspruch 5, dadurch gekennzeichnet, dass die Oeffnungen (8) im Siebteil (4) rechtwinklig sind.
EP85903418A 1984-06-15 1985-06-10 Verfahren zum brechen von bündeln zusammenballender hartfasern und oszillierender schirm Expired - Lifetime EP0221900B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8403237 1984-06-15
SE8403237A SE447080B (sv) 1984-06-15 1984-06-15 Sett och anordning vid tillforsel av fibrer till en blandningsanordning

Publications (2)

Publication Number Publication Date
EP0221900A1 EP0221900A1 (de) 1987-05-20
EP0221900B1 true EP0221900B1 (de) 1990-08-08

Family

ID=20356257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85903418A Expired - Lifetime EP0221900B1 (de) 1984-06-15 1985-06-10 Verfahren zum brechen von bündeln zusammenballender hartfasern und oszillierender schirm

Country Status (7)

Country Link
EP (1) EP0221900B1 (de)
JP (1) JPS61502391A (de)
AU (1) AU4544085A (de)
DE (1) DE3579167D1 (de)
SE (1) SE447080B (de)
WO (1) WO1986000044A1 (de)
ZA (1) ZA854456B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK164265C (da) * 1990-03-28 1992-11-02 Skako As Fremgangsmaade til dosering af fibre
EP0940168B1 (de) * 1998-03-06 2003-08-20 Excel Industries Limited Verfahren und Vorrichtung zur Einführung von Faserstoff in eine Substanz
GB9804782D0 (en) * 1998-03-06 1998-04-29 Excel Ind Ltd Methods and apparatus for the introduction of fibrous material into a fibrous mixture
JP4695347B2 (ja) * 2004-05-25 2011-06-08 光洋機械産業株式会社 生コンクリ−トにおける鋼繊維の供給装置
JP2013255879A (ja) * 2012-06-12 2013-12-26 Kureha Corp 炭素短繊維の篩分方法、及び炭素短繊維
JP6902858B2 (ja) * 2016-11-25 2021-07-14 株式会社Ｉｈｉ建材工業 繊維分散装置及びコンクリート製造装置
JP6550430B2 (ja) * 2017-09-01 2019-07-24 アルボルデマンサナ株式会社 コンクリートの現場練り製造ユニット
JP7083120B1 (ja) * 2021-12-24 2022-06-10 株式会社デーロス・ジャパン 幅狭空間用繊維補強コンクリート製造装置及び該装置を用いた交通供用下におけるトンネル覆工再生工法
JP7123328B1 (ja) * 2021-12-24 2022-08-23 株式会社デーロス・ジャパン コンクリート補強用短繊維の分散投入装置及び分散投入方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US724866A (en) * 1903-02-04 1903-04-07 Gustav J Holl Expanded-metal structure.
US2141400A (en) * 1936-01-11 1938-12-27 Cons Expanded Metal Companies Expanded metal product
GB1407035A (en) * 1972-07-22 1975-09-24 Caledonian Mining Co Ltd Apparatus for preparing and dispensing mixtures of concrete and fibres
DE2523905A1 (de) * 1975-05-30 1976-12-02 Joest Gmbh Schwingungstechnik Verfahren und vorrichtung zum vereinzeln von stahlfasern

Also Published As

Publication number Publication date
SE8403237L (sv) 1985-12-16
AU4544085A (en) 1986-01-10
ZA854456B (en) 1986-03-26
SE447080B (sv) 1986-10-27
WO1986000044A1 (en) 1986-01-03
JPS61502391A (ja) 1986-10-23
EP0221900A1 (de) 1987-05-20
SE8403237D0 (sv) 1984-06-15
DE3579167D1 (de) 1990-09-13

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