WO1991014927A1 - Method for weighing material arriving continuously - Google Patents

Method for weighing material arriving continuously 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
French (fr)
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/en

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.

Landscapes

  • 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

The invention relates to a method for weighing of material arriving continuously and being supplied to a conveyor element continuously running over pulleys, the supply of material to the conveyor element being temporarily interrupted and the material present on the conveyor element being weighed during the interruption of the supply of material before the material during the continuous movement of the conveyor element reaches the outfeed end thereof. The material arriving continuously is supplied to the conveyor element via a receptacle with a closeable outlet for collecting the material during the temporary interruption of the supply of material. The weighing operation is carried out by means of load cells supporting the conveyor element, and the admittance of the measuring signals from the load cells is co-ordinated via a control and calculating unit with the interruption of the supply of material to the transport member.

Description

METHOD FOR WEIGHING MATERIAL ARRIVING CONTINUOUSLY
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. In this connection 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.
An embodiment of the invention will be describ- ed below with reference to the appended drawing, on which fiures 1 - 4 in schematical side wiews of a weighing conveyor discloses different moments of the weighing method according to the invention.
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. 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¬ cessed 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. During 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.
As soon as all material that has been weighed has been discharged, 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.

Claims

1. Method for weighing material arriving continu¬ ously and being supplied to a conveyor element (11) continuously running over pulleys (10) , the supply of material to the conveyor element (11) being tem¬ porarily interrupted before the material present on the conveyor element (11) during the continuous movement thereof reaches the outfeed end of the con¬ veyor element (11) , and the conveyor element (11) including material present thereon being weighed during the interruption of the supply of material for determining the weight of the material present thereon before the material reaches the outfeed end, c h a r a c t e r i z e d in that the ma¬ terial is supplied to the conveyor element (11) com¬ prising a single belt conveyor via a receptacle (13) having a closeable discharge opening to the conveyor element for collecting the continuously arriving ma¬ terial during the temporary interruption of the sup¬ ply of material to the endless conveyor element (11) , and that the weighing operation is carried out by means of load cells (12) supporting the conveyor element, the admittance of the measuring signals from the load cells via a control and calculating unit (18) being co-ordinated with the interruption of the supply of material to the conveyor element.
2. Method as claimed in claim 1, c h a r a c ¬ t e r i z e d in that after discharge of the ma¬ terial the conveyor element (11) is cleaned by means of a scraper (15) disposed at the discharge end of the conveyor element (11) .
PCT/SE1990/000176 1988-09-21 1990-03-20 Method for weighing material arriving continuously WO1991014927A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8803337A SE463050B (en) 1988-09-21 1988-09-21 SET FOR WEIGHTING OF CONTINUOUS ARRIVAL MATERIALS

Publications (1)

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

Family

ID=20373400

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000176 WO1991014927A1 (en) 1988-09-21 1990-03-20 Method for weighing material arriving continuously

Country Status (2)

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

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 (en) *
CH400597A (en) * 1959-11-30 1965-10-15 Baker Perkins Holdings Ltd Continuously weight-dependent feeding or dispensing device
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 (en) *
CH400597A (en) * 1959-11-30 1965-10-15 Baker Perkins Holdings Ltd Continuously weight-dependent feeding or dispensing device
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
SE8803337L (en) 1990-03-22
SE463050B (en) 1990-10-01
SE8803337D0 (en) 1988-09-21

Similar Documents

Publication Publication Date Title
EP0034459B1 (en) Cereal grain moisture content measuring apparatus
US4420051A (en) Weighing apparatus
US4708215A (en) Automatic weighing system
US6437255B1 (en) Conveyor scale
US5289724A (en) Gravimetric metering apparatus for pourable materials
JPS57125322A (en) Method and device for collecting material to be measured in combined measuring apparatus
WO1991014927A1 (en) Method for weighing material arriving continuously
US6441321B1 (en) Method for controlling weight of divided portions
ATE44613T1 (en) SCALE FOR MASS FLOW DETECTION IN THE INLET OF AN EXTRUDER.
EP0758078B1 (en) Combinational weighing or counting apparatus
JPH08271328A (en) Combination weighing and counting system
US3164217A (en) Weighing device
CN2248875Y (en) Device for on-line temp. and moisture measuring of grain dring machine
US20050072603A1 (en) Weigh deck
EP0214259B1 (en) Method for measuring the quantity of a dried product
JPH0643012A (en) Method and apparatus for feeding object to be measured in combination measuring apparatus
JPH0556743A (en) Method for quantitatively dividing food and quantitatively dividing device therefor
JPH07128125A (en) Method and apparatus for combination metering
SU1008623A1 (en) Belt-conveyer weigher
CN212254286U (en) Automatic title material device
CN210824528U (en) Metering and mixing system for enzyme preparation
CN1197201A (en) Automatic weighing device
JP3306187B2 (en) Grain bulk weight verification device
JP2505983Y2 (en) Grain weighing equipment for grain rotation equipment
RU2105271C1 (en) Loose material dosing device

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR CA CH DE DK ES FI GB HU JP KP KR LK LU MC MG MW NL NO RO SD SE SU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BF BJ CF CG CH CM DE DK ES FR GA GB IT LU ML MR NL SE SN TD TG

NENP Non-entry into the national phase

Ref country code: CA

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642