EP0080826B1 - Verfahren und Maschine zum Befüllen von Beuteln mit körnigem Material - Google Patents

Verfahren und Maschine zum Befüllen von Beuteln mit körnigem Material Download PDF

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Publication number
EP0080826B1
EP0080826B1 EP82306119A EP82306119A EP0080826B1 EP 0080826 B1 EP0080826 B1 EP 0080826B1 EP 82306119 A EP82306119 A EP 82306119A EP 82306119 A EP82306119 A EP 82306119A EP 0080826 B1 EP0080826 B1 EP 0080826B1
Authority
EP
European Patent Office
Prior art keywords
filling
sack
weight
weighing
spout
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
Application number
EP82306119A
Other languages
English (en)
French (fr)
Other versions
EP0080826A3 (en
EP0080826A2 (de
Inventor
Edgar Anthoni Sommer
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8141277&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0080826(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by FLSmidth and Co AS filed Critical FLSmidth and Co AS
Publication of EP0080826A2 publication Critical patent/EP0080826A2/de
Publication of EP0080826A3 publication Critical patent/EP0080826A3/en
Application granted granted Critical
Publication of EP0080826B1 publication Critical patent/EP0080826B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/30—Devices or methods for controlling or determining the quantity or quality or the material fed or filled
    • B65B1/46—Check-weighing of filled containers or receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/30—Devices or methods for controlling or determining the quantity or quality or the material fed or filled
    • B65B1/32—Devices or methods for controlling or determining the quantity or quality or the material fed or filled by weighing

Definitions

  • the invention relates to a method of filling sacks, such as valve sacks, with pulverulent material, e.g. cement, by means of a sack-filling machine comprising a plurality of filling spouts suspended from respective electro-mechanical weighing systems each comprising a load cell and a weight setting unit which is preset to cut off the material from the filling spout when a sack on the filling spout has attained a certain weight.
  • a method is hereinafter referred to as of the kind described.
  • a method of the above kind is known from FR-A-2094168, in which, in order to be able to cut off the filling process as closely as possible to the desired weight the material flow through a filling spout is restricted to a slow flow when the sack is nearly filled, and thereafter cut off just before the preset weight is obtained.
  • Such a method is comparatively slow and does not ensure an exactly desired weight of a filled sack if the last part of the filling process is not performed very slowly.
  • a bulk bucket is filled to desired bulk weight, whereafter the charge is dumped into another bucket in which the charge weight is brought up to set weight.
  • the system is adapted to compensate for vibrational forces and variations in material flow rate and to control the weight of each charge with respect to a set weight also upon termination of charge accumulation.
  • Another known type of sack-filling machine is a rotatable, automatic machine with its filling spout distributed evenly around a circle and rotatable about the vertical axis of the machine.
  • a machine operates in the following way. After placement, manual or automatic, of a sack on a filling spout, the weighing system of the filling spout is tared for the weight of sack, dust deposits, etc., after which the filling of the pulverulent material into the sack starts. When the weighing system ascertains that the desired weight in the sack has been attained, the supply to the filling spout is cut off, and the sack is discharged. All this happens while the filling spout moves along its circular path about the axis of the filling machine.
  • a weighing system be it mechanical, electronic or combined electro-mechanical, would be capable of cutting off the filling process exactly when the desired weight in the sack had been attained.
  • the continuous measuring does not, however, follow an even curve because of the dynamic mass force deriving from the filling process, i.e. from the forceful outflow of pulverulent material through the filling spout and into the sack. Consequently, the cutting off of the filling process rarely takes place when the desired weight in the sack has been attained, but more often when the total load of the weight in the sack and the dynamic mass forces equal the desired weight.
  • An automatic check weighing made after the filling machine calls for extra equipment to control from which filling spout the individual check weighed sack is discharged.
  • a method of the kind described is characterised in that each filled sack is check weighed while hanging on its filling spout and that the result of the check weighing, immediately and before discharge of the sack from the filling spout, is used for resetting the weighing system for that spout.
  • the invention also includes a sack-filling machine for carrying out the method according to the invention the machine having a plurality of filling spouts suspended from respective electro-mechanical weighing systems each comprising a load cell and a weight setting unit; characterized in that each weighing system further comprises a comparator and a feed-back unit for instantaneous, automatic adjustment of the preset weight setting of the weighing system according to the actual weight of a just filled sack.
  • Figure 1 illustrates the travel of a filling spout along a circular path during the rotation of the sack-filling machine.
  • Various process stages are indicated along the path, of which only stages important for an understanding of the invention are provided with reference numerals.
  • a sack is placed, in the example automatically, on a filling spout, and between stages 2 and 3 the weight of the sack per se is tared in the weighing system of the filling spout in such manner that the sack weight does not influence the measurement of the weight proper of the material with which the sack is to be filled.
  • stage 3 starts the filling of the material into the sack, and this filling is cut off when the weighing system ascertains that the preset weight has been attained.
  • the filling of the sack has been completed, and at stage 6 the filled sack is discharged after which the filling spout is question is ready for receiving a new empty sack.
  • a check weighing stage 5 is inserted between stages 4 and 6, at which stage the filled sack is check weighed while still hanging on its filling spout, having settled down and no longer being exposed to dynamic impacts from the filling process. If the result of this check weighing deviates from the preset weight an instantaneous adjustment automatically takes place for the setting of the weighing system.
  • Figure 2 shows a rotating material container 7 of a sack-filling machine, the material being e.g. cement to be filled into sacks, and one filling spout 8 out of a number of filling spouts mounted around a circle, evenly distributed about the container 7.
  • the filling spout 8 is, as indicated, connected to the container 7 via a pipe or a hose with a valve 9, and is furthermore in a manner known per se suspended from a weighing system illustrated by a load cell 10 on the container 7.
  • a sack 11 which is to be filled with a certain weight of material from the container 7.
  • Figure 2 also shows an electro-mechanical setting unit 12, which has been set according to the required weight in the sack.
  • a comparator 13 receives a signal from the load cell 10 during the filling process and compares this signal with a signal from the setting unit 12.
  • the signal from the load cell 10 passes a damper unit 14 which damps fluctuations in this signal deriving from dynamic mass forces which arise during discharge of the material into the sack 11.
  • stage 4 in Figure 1 the filling is completed, and between stages 4 and 5 the weighing system settles down whereupon at stage 5 a check weighing is made which is not influenced by dynamic forces in the system.
  • a comparator and feed-back unit 15 the result of the check weighing is compared with the preset sack weight. If the actual weight in the sack 11 deviates from the one desired, adjustment of the setting unit 12 is made automatically in accordance therewith through the feed-back unit 15, and the weighing system is ready for a more precise weighing of the next sack to travel on the same spout along the circular path in Figure 1.
  • the check weighing system can in a simple way form an integral part of the weighing system measuring the material weight in the sack 11 during the filling process.
  • Figures 3 and 4 are weight/time-diagrams in which the ordinate indicates the actual weight of material in the sack whereas the abscissa indicates the time by markings corresponding to the previously mentioned process stages.
  • the dotted, horizontal line 16 indicates the preset weight of material in the filled sack.
  • Figure 3 shows a rectilinear ideal curve 17 of the weight of material filled into the sack at any time between stages 3 and 4. If the signal from the load cell 10 followed this curve exactly, the attainment of the desired weight would be very simple, as the filling could be cut off precisely when the curve 17 reached or intersected the horizontal line 16.
  • the signal from the load cell 10 will not be rectilinear and even, but a strongly fluctuating curve as indicated by 18 in Figure 3.
  • the intersection point between the horizontal line 16 and the curve 18 consequently does not every time coincide with the intersection point between the horizontal line 16 and the ideal curve 17 and thus the signal for closing the valve 9 may occur before or after the material weight in the sack has reached the preset weight. This may entail that sacks from the same filling spout do not contain the same preset weight.
  • a damper unit 14 is inserted between the load cell 10 and the comparator 13 so that the signal from the load cell 10 to the comparator 13 follows a curve 19 as shown in Figure 3.
  • This curve is, however, as a consequence of the damping delayed by a time lag t as compared with the ideal curve 17, and consequentially the valve 9 closes too late, i.e. the time lag t, after the sack has attained its desired weight.
  • the filling time is, however, not constant, and therefore a computer unit 20 is additionally inserted between the load cell 10 and the comparator 13 after the damper unit 14, the computer unit being programmed to compensate during the filling process for the time lag t in Figure 3 so that the signal received by the comparator 13 does not follow the curve 19 ( Figure 4), but a curve 21 which during the filling process approximates to the ideal curve 17 prior to the latter intersecting the horizontal line 16. In this way is achieved a cutting off of the filling exactly when the preset weight has been attained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)

Claims (3)

1. Verfahren zum Befüllen von Säcken mit einem körnigen Material mittels einer Sackbefüllungsmaschine mit einer Vielzahl von Füllstutzen (8), die von entsprechenden elektro-mechanischen Weigesystemen aus herunterhängen, die ihrerseits je über eine Lastzelle (10) und eine Gewichtseinstelleinheit (12) verfügen, die voreingestellt ist, um das Material aus dem Füllstutzen abzusperren, wenn ein Sack (11) an dem Füllstutzen ein bestimmtes Gewicht erreicht hat, dadurch gekennzeichnet, daß der gefüllte Sack zur Kontrolle gewogen wird, während er an seinem Füllstutzen hängt, und daß das Ergebnis der Kontrollwägung unmittelbar und vor der Entfernung des Sacks von dem Füllstutzen zur Neueinstellung des Wiegesystems für diesen Stutzen verwendet wird.
2. Sackbefüllungsmaschine zur Durchführung des Verfahrens nach Anspruch 1, wobei die Maschine über eine Vielzahl von Füllstutzen (8) verfügt, die von entsprechenden elektro-mechanischen Wiegesystemen aus herunterhängen, die ihrerseits je über eine Lastzelle (10) und eine Gewichtseinstelleinheit (12) verfügen, dadurch gekennzeichnet, daß jedes Wiegesystem des weiteren über einen Vergleicher (13) und eine Rückkoppelungseinheit (15) zur sofortigen, automatischen Einstellung der zuvor eingestellen Gewichtseinstellung des Wiegesystems entsprechend dem tatsächlichen Gewicht eines gerade gefüllten Sacks verfügt.
3. Sackbefüllungsmaschine nach Anspruch 2, dadurch gekennzeichnet, daß jedes Wiegesystem des weiteren über eine Dämpfereinheit (14) zum Dämpfen von Schwankungen im Signal der Lastzelle (10) und über eine Computereinheit (20) zum Ausgleichen einer durch die Dämpfereinheit (14) verursachten Signalverzögerung verfügt.
EP82306119A 1981-11-30 1982-11-17 Verfahren und Maschine zum Befüllen von Beuteln mit körnigem Material Expired EP0080826B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK529781A DK153679C (da) 1981-11-30 1981-11-30 Fremgangsmaade for fyldning af pulverformet materiale i ventilsaekke og maskine til udoevelse af fremgangsmaaden
DK5297/81 1981-11-30

Publications (3)

Publication Number Publication Date
EP0080826A2 EP0080826A2 (de) 1983-06-08
EP0080826A3 EP0080826A3 (en) 1984-04-04
EP0080826B1 true EP0080826B1 (de) 1986-05-28

Family

ID=8141277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82306119A Expired EP0080826B1 (de) 1981-11-30 1982-11-17 Verfahren und Maschine zum Befüllen von Beuteln mit körnigem Material

Country Status (10)

Country Link
EP (1) EP0080826B1 (de)
JP (1) JPS58112901A (de)
AU (1) AU549542B2 (de)
BR (1) BR8206915A (de)
DE (1) DE3271452D1 (de)
DK (1) DK153679C (de)
IN (1) IN157321B (de)
MX (1) MX156852A (de)
NZ (1) NZ202401A (de)
ZA (1) ZA827781B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8500052A (nl) * 1985-01-10 1986-08-01 Bates Cepro Bv Universele installatie voor het vullen van ventielzakken.
JPH0629043B2 (ja) * 1985-08-27 1994-04-20 東洋自動機株式会社 柔軟包装材料を使用したグロス計量包装方法
IT1188308B (it) * 1986-01-24 1988-01-07 Car Ventomatic Spa Pesatrice a peso netto per insaccatrice
JP4955163B2 (ja) * 2001-08-29 2012-06-20 大和製衡株式会社 重量式多連充填機
FR2900127B1 (fr) * 2006-04-24 2008-06-13 Pack Realisations Sa Remplisseuse d'emballage a dispositif de centrage et capteur s

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053332A (en) * 1958-05-01 1962-09-11 Pfizer & Co C Automatic fill-control system
DE2028506A1 (de) * 1970-06-10 1971-12-16 Zellstoffabrik Waldhof, 6800 Mannheim-Waldhof Maschine zum Füllen und gleichzeitigem Wiegen von Säcken
DE2205778A1 (de) * 1972-02-08 1973-08-16 Boekels & Co H Schaltungsanordnung zum einsatz an elektrischen messwertgebern, insbesondere elektro-mechanischen waagen
US4129189A (en) * 1976-05-07 1978-12-12 Steve C. Maglecic Weight control system
JPS5618884A (en) * 1980-05-13 1981-02-23 Aika Kogyo Kk Manufacture of ski

Also Published As

Publication number Publication date
JPH0333561B2 (de) 1991-05-17
AU549542B2 (en) 1986-01-30
AU9087182A (en) 1983-06-09
DK529781A (da) 1983-05-31
DE3271452D1 (en) 1986-07-03
JPS58112901A (ja) 1983-07-05
BR8206915A (pt) 1983-10-04
ZA827781B (en) 1983-08-31
MX156852A (es) 1988-10-07
IN157321B (de) 1986-03-01
DK153679B (da) 1988-08-15
NZ202401A (en) 1985-07-31
DK153679C (da) 1988-12-27
EP0080826A3 (en) 1984-04-04
EP0080826A2 (de) 1983-06-08

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