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WO2008037095A1 - Pèse-silo - Google Patents

Pèse-silo Download PDF

Info

Publication number
WO2008037095A1
WO2008037095A1 PCT/CH2007/000404 CH2007000404W WO2008037095A1 WO 2008037095 A1 WO2008037095 A1 WO 2008037095A1 CH 2007000404 W CH2007000404 W CH 2007000404W WO 2008037095 A1 WO2008037095 A1 WO 2008037095A1
Authority
WO
WIPO (PCT)
Prior art keywords
supports
support
diameter
load
silo
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.)
Ceased
Application number
PCT/CH2007/000404
Other languages
German (de)
English (en)
Inventor
Martin Lustenberger
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.)
Digi Sens AG
Original Assignee
Digi Sens AG
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 Digi Sens AG filed Critical Digi Sens AG
Publication of WO2008037095A1 publication Critical patent/WO2008037095A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/23—Support or suspension of weighing platforms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/48—Temperature-compensating arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing

Definitions

  • the present invention relates to a silo balance according to the preamble of claim 1.
  • Silo scales are several known. They are often used as gravimetric dosing scales according to the principle of weight or mass difference determination. For this purpose, the whole silo stands - usually three to four - scales. With their help, the gross weight of the silo is calculated as the sum.
  • the disadvantage of this approach is - among other things - that, for upgrading or retrofitting the silo with the weighing device, this must be lifted from the ground or the support surface and then has to be placed on the force inputs of the measuring cells. This process can only be carried out to a limited extent, especially for silos with many tons of bulk material content.
  • the differential weighing method is often unnecessarily accurate as the actual dosing method for inventory weighing.
  • An improved weighing device is described in the application WO2006 / 105679 (D1). There, the load borne by the supports of a silo is determined via the elastic elongation of the tubes forming the supports.
  • the object of the present invention is to provide a force measuring device for silos, with the help of existing silos can be retrofitted quickly and inexpensively, without facing the task of such silos - even in full condition - even stand out from the ground. Furthermore, it is the object of the invention to quickly vary changing temperatures of the silo-bearing frame of changes in the silo weight.
  • Fig. 5 is a logic diagram of signal decisions.
  • Such silos 1 are known per se and can be designed as sheet metal structures with a capacity up to about 200 tons.
  • loss-in-weight method it is necessary because of the required accuracy to turn off such a silo 1 with each support 5 on a load cell. Because of the high loads, which are constantly at rest on them, such load measuring cells also have relatively robust primary deformation bodies in connection with high-resolution measuring systems.
  • strain gauges strain gauges
  • load cells which exist in the field and are complex in terms of stressing - such as sill supports designed as truss structures.
  • stressing - such as sill supports designed as truss structures.
  • the relevant weight-proportional compressive stresses must be separated from the bending stresses, which can only be achieved by the Use of numerous DMS succeeds.
  • the correct attachment of strain gages to silos in use is almost hopeless due to the environmental conditions to be observed. Even if these conditions can be created and maintained, the effort to be made is great.
  • the four supports 5 here are made of tubes with a circular cross-section.
  • Figs. 2 to 5 The embodiment of the inventive concept is shown in Figs. 2 to 5.
  • the four supports 5 here with supports 51, 52, 53, 54
  • the supports 51, 54 are provided with measuring devices which measure the elastically widened by the load of the silo diameter of these supports 51, 54, for example, according to the document Dl.
  • Housings 6 attached to the supports 51, 54 contain at least parts of such measuring devices.
  • On the supports 52, 53 further measuring devices are mounted, of which in turn at least parts are housed in further housings 7.
  • Such a measuring device is shown in FIG. 3.
  • a tension or compression element 8 for example in the form of a rod, passes through the support 5 through two holes 9 and forms an angle ⁇ with the longitudinal axis 10 of the support 5.
  • the pull or duck element 8 is secured, for example, by a nut 11 which rests on a bolted to the outside of the support 5 first anchor plate 12.
  • a second anchor plate 13 is eb-outside screwed to the support 5.
  • the tension or pressure element 8 runs there without being touched by a guide element 14 and ends in a transducer 15, which converts the force signal transmitted by the tension or pressure element 8 into a corresponding electrical signal.
  • the tension or pressure element 8 is biased so that the entire force range to be measured by the transducer 15 is detected.
  • all known converters come into question, which forces' can convert into electrical signals with the necessary resolution and reproducibility, such as strain gauge assemblies, optical force transducers and vibrating string transducers.
  • a schematically illustrated cable 16 serves to supply power to the converter and to transmit the electrical signals to further processing units such as computers, transmission devices, if these are not already integrated in the converter.
  • the angle ⁇ is substantially 45 °.
  • the behavior of the loads of the transducer 15 and a transducer 17 determining the change in diameter, which is contained in the housings 6 - or may likewise be contained in the computer 20 - is shown in FIG. 4a.
  • the signal changes S Dia for the transient temperature changes taking into account measuring arrangement and S D for one, only the changes in the diameter of the support 5 forming pipe, are in opposite direction with load increase. Become the. Supports 5 suddenly cooled, for example, by heavy rain, so on the one hand decreases the diameter S D of the tube due to the temperature drop, on the other hand, also shortens the length of the support 5 quickly, while the tension or pressure element 8 is still substantially at the original temperature located.
  • the signal S D i a decreases until after some time the temperature compensation of support 5 and tension or pressure element 8 has set, as in Fig. 4b, together with the actual temperature turverlauf, is shown. For a short time, both signals have sign-like simultaneous changes.
  • This change in signatures S n and S D i a which is concurrent, can now be used to exclude that these signals are interpreted individually as weight or fill level values, as shown in the block diagram according to FIG. 5.
  • four computers 20 which each determine the weight information from the elastic deformation of the supports 51, 52, 53, 54, wherein in the exemplary embodiment according to FIG. 2 on the supports 51, 54 the pure diameter changes and in the supports 53, 55 are measured by the inclined by the angle ⁇ tensile or compressive elements 8, the superimposed longitudinal compression and the diameter changes.
  • the changes in the measurement results, ie .DELTA.S D a of the inclined tensile or compressive elements and the changes in the diameter .DELTA.S D those measuring devices which determine the diameter of the supports 51, 54, are from the computers 20 to four discriminators 21, 22, 23, 24 transmitted.
  • Each of the discriminators 21 to 24 respectively forms the difference of the measurement results (S (t) -S (t + ⁇ t) where ⁇ t is a predetermined time difference.) Also schematically included in this check circuit are six AND gates 25 to 30, the link The supports 51, 53 face each other diagonally with respect to the arrangement of the four supports 51 to 54. The same applies to the supports 52 and 54.
  • Such a difference formation can be done with a - known per se - differential circuit. In silos with only three supports 5 usually one of the three supports 5 is used both with a transducer 15 at an angle ⁇ inclined tensile or Druckelement- 8, in addition to the diameter of the support 5 detecting sensor.
  • all supports 5 are equipped both with measuring arrangements, which measure according to the prior art, the change of the diameter S D (t), as well as with those which enforce the supports 5 at an angle ⁇ and thus S D i a measure up.
  • the associated transducers 15 are accommodated in said housings 7.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un dispositif de détermination du niveau de remplissage de silo s(1) qui présente au moins trois montants tubulaires (5) à section transversale circulaire. Au moins un de ces montants (5) porte un détecteur qui détermine les modifications du diamètre dudit montant (5) et en déduit la charge axiale. Les autres montants (5) portent des transducteurs (15) dotés de calculateurs (20). Un élément de traction et de compression (8) traverse les montants (5) dans une direction oblique sous un angle a. Comme, en raison de la relation de Poisson, la compression longitudinale élastique représente environ trois fois l'allongement transversal, une charge supplémentaire sur les montants (5) entraîne un délestage de l'élément de traction ou de compression (8). Si les montants (5) sont refroidis rapidement, l'élément de traction et de compression (8) reste d'abord à la température et à la longueur initiales, avec pour effet que le transducteur (10) interprète ce phénomène comme un délestage du silo (1). Chacun des détecteurs qui mesurent le diamètre des montants (5) l'interprète de la même manière. L'utilisation de circuits de discrimination ou de différenciation permet de distinguer dans chaque cas si ces brèves modifications de la charge résultent de modifications transitoires de température ou de modifications réelles de la charge.
PCT/CH2007/000404 2006-09-29 2007-08-17 Pèse-silo Ceased WO2008037095A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1559/06 2006-09-29
CH15592006 2006-09-29

Publications (1)

Publication Number Publication Date
WO2008037095A1 true WO2008037095A1 (fr) 2008-04-03

Family

ID=37569423

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2007/000404 Ceased WO2008037095A1 (fr) 2006-09-29 2007-08-17 Pèse-silo

Country Status (1)

Country Link
WO (1) WO2008037095A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020221857A1 (fr) 2019-04-30 2020-11-05 Nanolike Systèmes et procédés de mesure du niveau de remplissage d'un silo

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3725332A1 (de) * 1987-07-30 1989-02-16 Zeppelin Metallwerke Gmbh Behaelter
US5777234A (en) * 1996-08-01 1998-07-07 Kistler-Morse Corporation Pre-straining apparatus and method for strain sensors
DE10129687C1 (de) * 2001-06-22 2002-12-12 Rembe Gmbh Mes Und Regeltechni Verfahren und Vorrichtung zur Gewichtsbestimmung des Siloinhalts eines Silos
WO2006105679A1 (fr) * 2005-04-08 2006-10-12 Digi Sens Ag Balance de silo

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3725332A1 (de) * 1987-07-30 1989-02-16 Zeppelin Metallwerke Gmbh Behaelter
US5777234A (en) * 1996-08-01 1998-07-07 Kistler-Morse Corporation Pre-straining apparatus and method for strain sensors
DE10129687C1 (de) * 2001-06-22 2002-12-12 Rembe Gmbh Mes Und Regeltechni Verfahren und Vorrichtung zur Gewichtsbestimmung des Siloinhalts eines Silos
WO2006105679A1 (fr) * 2005-04-08 2006-10-12 Digi Sens Ag Balance de silo

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020221857A1 (fr) 2019-04-30 2020-11-05 Nanolike Systèmes et procédés de mesure du niveau de remplissage d'un silo
FR3095696A1 (fr) * 2019-04-30 2020-11-06 Nanolike Systèmes et procédés de mesure du niveau de remplissage d’un silo
US11920969B2 (en) 2019-04-30 2024-03-05 Nanolike Systems and methods for measuring the filling level of a silo
EP3963296B1 (fr) 2019-04-30 2024-10-09 Nanolike Systèmes et procédés de mesure du niveau de remplissage d'un silo

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