WO1994007783A1 - Procede et chargeur a vibrations utilises pour doser des materiaux en vrac - Google Patents

Procede et chargeur a vibrations utilises pour doser des materiaux en vrac Download PDF

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Publication number
WO1994007783A1
WO1994007783A1 PCT/DK1993/000320 DK9300320W WO9407783A1 WO 1994007783 A1 WO1994007783 A1 WO 1994007783A1 DK 9300320 W DK9300320 W DK 9300320W WO 9407783 A1 WO9407783 A1 WO 9407783A1
Authority
WO
WIPO (PCT)
Prior art keywords
feed trough
bulk goods
trough
vibration feeder
frame
Prior art date
Application number
PCT/DK1993/000320
Other languages
English (en)
Inventor
Kim Kristian Davidsen
Original Assignee
Skako A/S
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 Skako A/S filed Critical Skako A/S
Priority to AU51486/93A priority Critical patent/AU5148693A/en
Publication of WO1994007783A1 publication Critical patent/WO1994007783A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • B65G65/34—Emptying devices
    • B65G65/40—Devices for emptying otherwise than from the top
    • B65G65/44—Devices for emptying otherwise than from the top using reciprocating conveyors, e.g. jigging conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/02—Devices for feeding articles or materials to conveyors
    • B65G47/16—Devices for feeding articles or materials to conveyors for feeding materials in bulk
    • B65G47/18—Arrangements or applications of hoppers or chutes
    • B65G47/19—Arrangements or applications of hoppers or chutes having means for controlling material flow, e.g. to prevent overloading

Definitions

  • the invention concerns a method of metering bulk goods, such as concrete, fibres, granulates and stone, by means of a vibration feeder which comprises a feed trough and at least one vibrator secured on the feed trough as well as a plurality of carrier springs, e.g. screw springs, for flexibly mounting the trough on a support, said bulk goods being fed to the feed trough from a supply container arranged above it.
  • a vibration feeder which comprises a feed trough and at least one vibrator secured on the feed trough as well as a plurality of carrier springs, e.g. screw springs, for flexibly mounting the trough on a support, said bulk goods being fed to the feed trough from a supply container arranged above it.
  • Vibration feeders are extremely suitable for metering bulk goods which are filled from e.g. an overlying supply con ⁇ tainer down into the feed trough. In operation the bulk goods are then thrown slightly upwards and forwards in the feed trough for each vibration cycle and are transported in this manner forwardly to the end edge of the trough at a rate which depends on the amplitude and frequency of the vibrations. These parameters can be regulated to a certain degree for some vibrators, but only to a limited extent.
  • a relatively small and inexpensive vibration feeder may be selected, by means of which a satisfactory metering accuracy can be obtained much more easily, but now at the expensive of the capacity. If it is attempted to force up the capacity by filling the feed trough with a large amount of bulk goods, these will frequently tend to pack in the feed trough, which frequently results in a considerable reduction in the metering accuracy. In some case the bulk goods may even pack so densely as to clog up the trough, whereby the vibrators might be damaged, and products for which the metered material were to be used, might be destroyed. Once a trough has become clogged up with bulk goods, a not insignificant amount of manual labour is usually required to subsequently loosen and optionally remove the packed bulk goods.
  • the German Offenlegungsschrift DE 3700270 Al discloses a pivotable trough for transferring granular bulk goods from a supply container to an underlying conveyer. Changing the inclination of the pivotable trough so that its discharge end is directly above the conveyer obviates the previous drawback of dust formation when the bulk goods fall down on the conveyer. When the flow of bulk goods is to be stopped, the pivotable trough is pivoted upwards so that an edge in the outlet from the supply container is lowered into the bulk goods and blocks the flow thereof.
  • This structure does not solve the problem of economically filling e.g. a mould both quickly and accurately.
  • the feed trough is initially placed in a position of such a great angle that the bulk goods are transported along the feed trough at a great rate, and then in a position of such a small angle that the bulk goods are transported along the feed trough at a small rate.
  • the bulk goods can now be metered quickly and accurately and at relatively low vibrator feeder investment costs.
  • the reason is that the process initially takes place as a rough sorting where gravity is employed to a considerable extent for rapidly filling e.g. a mould, and then the angular position of the feed trough is diminished so much that the bulk goods are substantial ⁇ ly transported in the feed trough by means of its vibrat ⁇ ing movements.
  • This switches the feed trough to fine metering which ensures accurate filling of the mould, and at the same time it is just necessary to dimension the vibration feeder for the relatively modest capacity which fine metering requires. It is therefore possible to use a small and inexpensive vibration feeder for filling of bulk goods amounts which previously required much larger vibra ⁇ tion feeders and/or much greater space of time for the filling.
  • the invention also concerns a vibration feeder for meter- ing bulk goods, such as concrete, fibres, granulates and stone, and comprising a feed trough and at least one vibrator secured on the feed trough as well as a plurality of carrier springs, e.g. screw springs for flexibly mount ⁇ ing the trough on a support, and the novel and unique fea- tures of this vibration feeder are that a frame is inter ⁇ posed between the vibration feeder and the carrier springs, and that the frame is tiltably arranged on the support and can be caused to assume at least two diffe ⁇ rent, preselected angular positions with respect to it by means of at least one actuator which is connected partly with the frame, partly with the support.
  • the vibration feeder like in the example previously mentioned, is to be used for filling a mould with con- crete, this can now take place in the manner that the feeder is first tilted to a suitable, obliquely downwardly extending angular position where gravity assists the vibration forces applied simultaneously.
  • the bulk goods will therefore partly almost slide down the feed trough and fill the mould in a short time.
  • the feed trough is tilted up to another less inclined or horizontal posi- tion in which the metering is-terminated at a small rate and a correspondingly great accuracy. If during filling the concrete should tend to pack in the trough, this can easily be remedied by increasing its inclination.
  • the actuator may e.g. be a linear motor, but in a pre ⁇ ferred embodiment it is a pneumatic or hydraulic drive cylinder which may optionally be in the form of a rotary cylinder. If a known, repeating process is involved, it will be advantageous if the angular positions of the trough are determined by means of fixed stops.
  • the actuator is e.g. a pneumatic drive cylinder
  • the air pressure fails, so that the tilting movement of the trough will get out of control.
  • at least one zero position spring e.g. a leaf spring, which is connected at one end with the frame and at the other with the support and is biased in a manner such that the frame is forced into its starting position if the air pressure fails and the pneumatic drive cylinder is consequently rendered inoperative.
  • the feed trough is located below a lower opening in a supply container for the bulk goods.
  • the supply container hereby acts as a support for the frame, which is tiltably suspended by means of pivots arranged at the respective sides of the supply container in the vicinity of its lower opening.
  • fig. 1 is a perspective view of a vibration feeder accord- ing to the invention suspended from a supply container and having a conveyer belt located below the discharge end of the feeder,
  • fig. 2 is a lateral view of the vibration feeder shown in fig. 1 with the feed trough in an upper angular position
  • fig. 3 is a view of the same, but with the feed trough in a lower angular position.
  • the vibration feeder is generally designated by the reference numeral 1.
  • the vibration feeder is suspended from a supply container 2, which consists of an upper portion 3 and a lower portion 4 which are assembled by means of flanges 5 screwed together with a plurality of screws (not shown). Downwardly the supply container has a lower opening 6 through which the bulk goods (not shown) to be metered can run out to be received by the underlying feed trough 7 of the vibration feeder.
  • the feed trough is reinforced by stiffeners 8 and upper flaps 9.
  • a vibrator 10, which serves to vibrate the vibration feeder, is rigidly connected with the feed trough 7 by means of an attachment 11.
  • a conveyer belt 12 is located below the discharge end of the feed trough to convey the metered material in the direction indicated by the arrow.
  • the feed trough 7 is suspended freely pivotably from a frame 14 by means of four screw springs 13.
  • This frame consists of two opposed side members 15 which are connected by two transverse members 16. Each side member 15 is tiltably suspended from the lower portion 4 of the supply container 2 by means of a pivot 17 and a bracket
  • the screw springs 13 are inserted between the frame 14 and the upper flaps 9 of the feed trough 7 and are secured to the respective parts by means of screws 19, 20.
  • two leaf springs 21 are interposed between the frame 14 and the lower portion 4 of the supply container 2, each of said leaf springs being secured to the lower portion 4 by means of a bracket 22 and extending into a slot 23 in one of the transverse members 16 of the frame 14.
  • the lower portion 4 of the supply container 2 mounts a bracket 24 which, by means of pivots 25, pivot- ably carries a drive cylinder 26 having a piston rod 27 whose outer end is connected with another bracket 28, which is in turn rigidly connected with the frame 14.
  • a first stop boss 29 and a second stop boss 30 are provided on respective sides of the lower portion 4 of the supply container 2 to fix an upper feed trough tilted position and a lower feed trough tilted position, respec ⁇ tively.
  • a suitable amount of the respective bulk goods is placed in the supply container 2, from which it drops down into the feed trough via the lower opening 6 of the container.
  • the feed trough 7 is in a vibrating state, since it is vibrated by the vibrator 10 and is suspended freely pivotably from the springs 13.
  • the vibrations propagate to the bulk goods which are placed in the feed trough 7, and which are therefore transported in small jumps upwards and forwards to the discharge end of the feed trough, from which the bulk goods successively drop down on the con ⁇ veyer belt 12 which conveys the bulk goods further on to the location of use.
  • the feed trough 7 is rotated by means of the drive cylinder 26 to the lower position of fig. 3 in which the frame 14 abuts the second stop boss 30. In this position the bulk goods will rapidly be driven out from the feed trough under the simultaneous action of gravity and vibration forces.
  • the frame 14 is rotated by means of the drive cylinder 26 up to the position of fig. 2 in which the frame 14 abuts the first stop boss 29.
  • the bottom of the feed trough 7 is substantially horizon ⁇ tal, and the bulk goods present in the feed trough are therefore just subjected to vibration forces. This means that the bulk goods can be discharged from the end edge of the feed trough only slowly, thereby making it possible to cut off the flow of material relatively accurately when the vibrator 10 is stopped.
  • the vibration feeder of the invention can thus work with great capacity as well as with great accuracy during a metering process.
  • the feed trough 7 could tilt between a lower fixed position in which meter ⁇ ing took place at a great rate, and an upper fixed posi ⁇ tion in which metering took place with a great accuracy.
  • this is just to be understood as an example of the how the feed trough 7 can be caused to assume posi- tions which are compatible with the requirement that the vibration feeder is to have a great capacity and also is to be able to work with great accuracy.
  • the angular positions may describe a pattern where the trough is initially present in a steeply inclined position and is gradually rotated up to a position of negative inclination at the end of the metering, where gravity and vibration forces neutralize each other so that metering automatically stops.
  • concrete can be poured into a mould in this manner in an even very accu- rately metered amount.
  • the vibration feeder of the inven ⁇ tion shown by way of example in figs.
  • the actuator consists of a pneumatic cylinder 26, which may be sub ⁇ jected to air failure.
  • the feed trough 7 is no longer under control, and it can therefore by itself pivot into positions which may have unfortunate conse ⁇ quences.
  • the two prebiased leaf springs 21 are provided, which always try to urge the feed trough 7 back to its upper angular position in which the frame 14 engages the first stop boss 29.
  • the vibration feeder of the invention may be used for many different purposes extending from pouring of concrete to metering of e.g. fibres, sand, gravel, pebble, limestone, and rock.
  • difficulties have often been encountered in rock or limestone quarries when conventional vibration feeders are used, since materials of this type tend to get wedged between the sides of the feed trough. This problem is easily remedied by means of the vibration feeder of the invention, whose feed trough is then merely rotated to suitably inclined position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigging Conveyors (AREA)
  • Feeding Of Articles To Conveyors (AREA)

Abstract

Procédé et chargeur (1) à vibrations utilisés pour doser des matériaux en vrac tels que du béton, des fibres, des granulés et des pierres. Le chargeur à vibrations comprend une cuve (7) et au moins un vibrateur (10) fixé sur cette dernière ainsi que plusieurs ressorts (13) à hélice servant à suspendre de manière souple la cuve (7) depuis un réservoir (2) d'alimentation. Un cadre (14) est placé entre le réservoir d'alimentation et les ressorts à hélice (13), ledit cadre étant monté basculant sur le réservoir (2) d'alimentation au moyen de pivots (17) et de supports (18). La cuve (7) d'alimentation peut être orientée angulairement par un cylindre (26) d'entraînement qui est partiellement relié au cadre (14) et au réservoir (2) d'alimentation. Ceci signifie qu'un seul et unique chargeur (1) à vibrations peut fonctionner même à une taille réduite, à une vitesse de dosage considérable, étant donné que la cuve (7) d'alimentation se trouve alors placée dans une position relativement inclinée. A la fin du processus de dosage la cuve (7) d'alimentation remonte dans une position légèrement inclinée, horizontale ou inclinée vers le bas, selon les besoins, ce qui permet de doser les matériaux avec une grande précision.
PCT/DK1993/000320 1992-10-02 1993-10-04 Procede et chargeur a vibrations utilises pour doser des materiaux en vrac WO1994007783A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU51486/93A AU5148693A (en) 1992-10-02 1993-10-04 A method and a vibration feeder for metering bulk goods

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1212/92 1992-10-02
DK121292A DK121292D0 (da) 1992-10-02 1992-10-02 Vibrationsfoeder

Publications (1)

Publication Number Publication Date
WO1994007783A1 true WO1994007783A1 (fr) 1994-04-14

Family

ID=8102245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1993/000320 WO1994007783A1 (fr) 1992-10-02 1993-10-04 Procede et chargeur a vibrations utilises pour doser des materiaux en vrac

Country Status (3)

Country Link
AU (1) AU5148693A (fr)
DK (1) DK121292D0 (fr)
WO (1) WO1994007783A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388810A (zh) * 2017-08-31 2017-11-24 吴素贞 一种调节方便的干燥机进料架
CN108861459A (zh) * 2018-07-09 2018-11-23 江苏永钢集团有限公司 一种散料在线分料装置
CN111661497A (zh) * 2020-06-29 2020-09-15 中国二十冶集团有限公司 一种储料罐
WO2022180400A1 (fr) * 2021-02-26 2022-09-01 Atlas Copco Ias Uk Limited Appareil d'alimentation en éléments de fixation
USD993733S1 (en) 2021-02-25 2023-08-01 Atlas Copco Ias Uk Limited Riveting machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2263876A1 (de) * 1971-12-28 1973-07-05 Ardal Og Sunndal Verk Foerder- und zumessanlage fuer koerniges material
DE3700270A1 (de) * 1987-01-07 1988-07-21 Jan Dipl Ing Boie Schwingrinne zum austragen und absperren eines koernigen schuettgutes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2263876A1 (de) * 1971-12-28 1973-07-05 Ardal Og Sunndal Verk Foerder- und zumessanlage fuer koerniges material
DE3700270A1 (de) * 1987-01-07 1988-07-21 Jan Dipl Ing Boie Schwingrinne zum austragen und absperren eines koernigen schuettgutes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388810A (zh) * 2017-08-31 2017-11-24 吴素贞 一种调节方便的干燥机进料架
CN107388810B (zh) * 2017-08-31 2019-06-07 吴素贞 一种调节方便的干燥机进料架
CN108861459A (zh) * 2018-07-09 2018-11-23 江苏永钢集团有限公司 一种散料在线分料装置
CN111661497A (zh) * 2020-06-29 2020-09-15 中国二十冶集团有限公司 一种储料罐
USD993733S1 (en) 2021-02-25 2023-08-01 Atlas Copco Ias Uk Limited Riveting machine
WO2022180400A1 (fr) * 2021-02-26 2022-09-01 Atlas Copco Ias Uk Limited Appareil d'alimentation en éléments de fixation

Also Published As

Publication number Publication date
AU5148693A (en) 1994-04-26
DK121292D0 (da) 1992-10-02

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