WO1991014927A1 - Procede de pesage d'un materiau arrivant en continu - Google Patents

Procede de pesage d'un materiau arrivant en continu Download PDF

Info

Publication number
WO1991014927A1
WO1991014927A1 PCT/SE1990/000176 SE9000176W WO9114927A1 WO 1991014927 A1 WO1991014927 A1 WO 1991014927A1 SE 9000176 W SE9000176 W SE 9000176W WO 9114927 A1 WO9114927 A1 WO 9114927A1
Authority
WO
WIPO (PCT)
Prior art keywords
conveyor element
supply
interruption
conveyor
weighing
Prior art date
Application number
PCT/SE1990/000176
Other languages
English (en)
Inventor
Olle Gustaf Lundborg
Original Assignee
Swedcell Handelsbolag
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 Swedcell Handelsbolag filed Critical Swedcell Handelsbolag
Publication of WO1991014927A1 publication Critical patent/WO1991014927A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
    • G01G11/08—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having means for controlling the rate of feed or discharge
    • G01G11/083—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having means for controlling the rate of feed or discharge of the weight-belt or weigh-auger type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
    • G01G11/003—Details; specially adapted accessories
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
    • G01G13/24—Weighing mechanism control arrangements for automatic feed or discharge
    • G01G13/248—Continuous control of flow of material

Definitions

  • the present invention relates to a method for weighing material arriving continously and being supplied to an endless conveyor element continuously running over pulleys.
  • Known devices for weighing material which is continuously transported on a belt conveyor are based on the principle of continuously scanning the load acting upon a belt supporting roller by means of a load transducer connected to the supporting roller and multiplying said load with the belt vel ⁇ ocity.
  • the accuracy is limited partly by the fact that the measuring principle per se (multiplication and addition of instantaneous values) involves a magnification of the error in measurement of the load transducer, partly due to the fact that the measuring result is affected by the distribution of material on the belt and by the extent to which the belt is kept clean and tightened.
  • the object of the present invention is to bring about a method for continuous weighing providing a considerably improved weithing accuracy. This object is obtained by a method incorporating the charac ⁇ terizing features according to claim 1. Due to the fact that the weighing operation thus is carried out charge by charge, the calibration of the load trans ⁇ ducers further is considerably simplified and less time consuming.
  • Fig 1 discloses a conveyor belt 11 continuously running over pulleys 10, said belt consisting of e.g. rubber cloth, textile cloth, steel netting or steel discs and being supported by a weighing device comprising four load cells 12.
  • a hopper-shaped re ⁇ ceptacle 13 Disposed at the in- feed end of the conveyor belt is a hopper-shaped re ⁇ ceptacle 13 having its mouth positioned just above the conveyor belt, material being supplied to this receptacle from a continuously running conveyor 14.
  • a scraper 15 for cleaning the conveyor belt is dis ⁇ posed at the outfeed end of the conveyor belt.
  • the mouth of the receptacle is provided with a damper 16 or a similar means for temporarily interrupting the supply of material to the conveyor belt.
  • the damper is connected with an operating device 17 which is functionally connected with a control and calculat ⁇ ing unit (computer) 18, which also is functionally connected with the load cells.
  • the control and cal ⁇ culating unit co-ordinates the interruption of the supply of material by means of the damper and the admittance of the measuring signal from the load cells so that the measuring signals are being pro ⁇ Ded only when the supply of material is inter ⁇ rupted, for calculating the weight of material on the conveyor belt in dependence of signals from the load cells.
  • a display 19 for indicating the measur ⁇ ing result and/or an apparatus for recording the measure result is connected to the control and cal ⁇ culating unit.
  • Fig 1 shows the first phase of the functional cycle, the filling cycle, wherein material arriving continuously via the receptacle 13 is supplied to the conveyor belt 11 and is further transported thereon.
  • Fig 2 shows how the supply of material to the conveyor belt 11 is temporarily shut off before the material supplied reaches the outfeed end of the conveyor belt.
  • the activation of the operating de ⁇ vice 17 for closing the damper 16 is effected in de ⁇ pendence of a signal from the control and calculat ⁇ ing unit 18 and is co-ordinated with admittance of the measuring signals from the load cells 12.
  • Fig 3 shows the very weighing phase, when the continuously arriving material temporarily is col ⁇ lected in the receptacle 13 while weighing is car ⁇ ried out of the conveyor belt 11 and material pre ⁇ sent thereon.
  • the weight of the material is cal ⁇ culated and indicated on the display 19 and/or is registered on a printer, a counter or a similar de ⁇ vice.
  • the admittance of the measuring signals from the load cells 12 is discontinued before the ma ⁇ terial reaches the outfeed end of the conveyor belt is co-ordinated by the control and calculating unit 18 with the activation of the operating device 17 for opening the damper 16.
  • Fig 4 shows a terminating emptying phase and the simultaneously starting filling phase in a new functional cycle.
  • the emptying phase the ma ⁇ terial which has been weighed is discharged over the pulley 10 at the outfeed end at the same time as supply of material to the conveyor belt is carried out during successive emptying of the receptacle 13. Due to the continuous movement of the conveyor belt during the temporary interruption of the supply of material, the material thus supplied and the ma ⁇ terial already weighed will be separated by an interspace 20 on the conveyor belt.
  • the operating device for clos ⁇ ing the damper is activated and the measuring sig ⁇ nals from the load cells are admitted for determin- ing the weight of the material present on the con ⁇ veyor belt before the material has reached the out- feed end of the conveyor belt and before an addi ⁇ tional new cycle as described above is started.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Structure Of Belt Conveyors (AREA)

Abstract

L'invention se rapporte à un procédé qui sert à assurer le pesage d'un matériau arrivant en continu et alimentant un élément transporteur avançant en continu sur des poulies et dans lequel l'arrivée du matériau sur l'élément transporteur est temporairement interrompue et le matériau présent sur l'élément transporteur est pesé pendant l'interruption de l'arrivée du matériau, avant que ce matériau, pendant le mouvement continu de l'élément transporteur, atteigne l'extrémité de décharge de ce dernier. Le matériau arrivant en continu alimente l'élément transporteur via un récipient ayant une sortie fermante et servant à recueillir le matériau pendant l'interruption temporaire de l'arrivée de matériau. L'opération de pesage est effectuée au moyen de cellules dynamométriques soutenant l'élément transporteur et l'admission des signaux de mesure provenant des cellules dynamométriques est coordonnée via une unité de commande et de calcul avec l'interruption de l'arrivée du matériau sur le dispositif transporteur.
PCT/SE1990/000176 1988-09-21 1990-03-20 Procede de pesage d'un materiau arrivant en continu WO1991014927A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8803337A SE463050B (sv) 1988-09-21 1988-09-21 Saett foer vaegning av kontinuerligt ankommande material

Publications (1)

Publication Number Publication Date
WO1991014927A1 true WO1991014927A1 (fr) 1991-10-03

Family

ID=20373400

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000176 WO1991014927A1 (fr) 1988-09-21 1990-03-20 Procede de pesage d'un materiau arrivant en continu

Country Status (2)

Country Link
SE (1) SE463050B (fr)
WO (1) WO1991014927A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6437255B1 (en) 1997-01-17 2002-08-20 K-Tron Technologies, Inc. Conveyor scale
US11994423B2 (en) 2020-08-28 2024-05-28 Renovators, Llc Weigh belt assembly with a weigh axis that intersects a rotational axis of an idler roller

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE279217C (fr) *
CH400597A (de) * 1959-11-30 1965-10-15 Baker Perkins Holdings Ltd Kontinuierlich gewichtsabhängig arbeitende Zuführungs- bzw. Zuteilvorrichtung
US3525410A (en) * 1967-07-20 1970-08-25 Heinz Focke Method of and apparatus for forming predetermined quantities of material from a continuous fiber fleece
US3994404A (en) * 1975-07-16 1976-11-30 Kisovec Jean Francis Portable mixing plant for concrete and the like
GB2165365A (en) * 1984-10-01 1986-04-09 Hi Speed Checkweigher Co High-speed transporting and weighing machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE279217C (fr) *
CH400597A (de) * 1959-11-30 1965-10-15 Baker Perkins Holdings Ltd Kontinuierlich gewichtsabhängig arbeitende Zuführungs- bzw. Zuteilvorrichtung
US3525410A (en) * 1967-07-20 1970-08-25 Heinz Focke Method of and apparatus for forming predetermined quantities of material from a continuous fiber fleece
US3994404A (en) * 1975-07-16 1976-11-30 Kisovec Jean Francis Portable mixing plant for concrete and the like
GB2165365A (en) * 1984-10-01 1986-04-09 Hi Speed Checkweigher Co High-speed transporting and weighing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6437255B1 (en) 1997-01-17 2002-08-20 K-Tron Technologies, Inc. Conveyor scale
US11994423B2 (en) 2020-08-28 2024-05-28 Renovators, Llc Weigh belt assembly with a weigh axis that intersects a rotational axis of an idler roller

Also Published As

Publication number Publication date
SE463050B (sv) 1990-10-01
SE8803337L (sv) 1990-03-22
SE8803337D0 (sv) 1988-09-21

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