WO1989006785A1 - Balance, son procede d'etalonnage et d'utilisation - Google Patents

Balance, son procede d'etalonnage et d'utilisation Download PDF

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Publication number
WO1989006785A1
WO1989006785A1 PCT/CH1989/000007 CH8900007W WO8906785A1 WO 1989006785 A1 WO1989006785 A1 WO 1989006785A1 CH 8900007 W CH8900007 W CH 8900007W WO 8906785 A1 WO8906785 A1 WO 8906785A1
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WO
WIPO (PCT)
Prior art keywords
mass
balance
weight
dynamometer
load carrier
Prior art date
Application number
PCT/CH1989/000007
Other languages
German (de)
English (en)
Inventor
Mario Gallo
Johannes Wirth
Original Assignee
Wirth, Gallo Messtechnik 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 Wirth, Gallo Messtechnik Ag filed Critical Wirth, Gallo Messtechnik Ag
Publication of WO1989006785A1 publication Critical patent/WO1989006785A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/01—Testing or calibrating of weighing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/24—Guides or linkages for ensuring parallel motion of the weigh-pans
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/002—Means for correcting for obliquity of mounting

Definitions

  • the present invention relates to a scale as a real mass meter, in which the weight of the goods to be weighed is compared with the weight of a reference mass, which scale only has to be calibrated by the manufacturer, and the mass without re-calibration, both when misaligned and when gravitational acceleration g deviates from the normal value of the goods to be weighed correctly, whereby the misalignment can amount to a noticeable reduction in the acceleration due to gravity.
  • Such scales are known per se, for example from CH-PS 492 961 and CH Pat. Anm. 03 791 / 87-5. Like the old - purely mechanical - shop scales with weight stones or the tilt scales, they work according to the principle of constantly comparing the mass of the weighing sample with the reference mass.
  • those which are disclosed in the two cited documents consist of two force gauges which are hardcuffed by means of a sensor.
  • the object that is to be achieved with the present invention is to create a balance that compares the weight of the goods to be weighed with the weight of a reference mass, and whose independence from misalignment and local deviations from the standard value of gravitational acceleration is achieved with little effort.
  • FIG. 1 shows a schematic view of a first exemplary embodiment with a direct-acting reference mass
  • FIG. 2 shows a schematic view of a second exemplary embodiment with a translated reference mass
  • FIG. 3 shows a third exemplary embodiment with an elastically reducing parallel guide and direct-acting reference mass
  • FIG. 4 shows a fourth exemplary embodiment translated more effective
  • FIG. 5 shows a fifth embodiment with a removable weighing pan.
  • the first exemplary embodiment according to FIG. 1 consists of a frame 1, a load carrier 2, which is guided in parallel by two plates 4, 5, which are mounted in joints 3.
  • the weight of the goods to be weighed - represented by a weight stone 8 in FIG. 1 - is transferred to a dynamometer 7 via a stilt 6.
  • the load carrier 2 is hard bound.
  • a mass 9 is also attached to the load carrier 2.
  • the effective weights of the plates 4, 5, the weight of the load carrier 2 and that of the mass 9 together form the reference force which acts on the dynamometer 7 when the load carrier 2 is empty.
  • the electrical signals emitted by the dynamometer - analog or digital - are fed into a computer 10 via a cable 11.
  • the computer 10 is connected to the frame. It goes without saying in the sense of the invention to make the cable 11 so long that the computer 10 can stand on its own.
  • the embodiment according to FIG. 2 is basically constructed in the same way as that of FIG. 1. The change lies in the way in which the mass 9 is fastened and acts. With the frame 1, a support 13 is fixedly connected, which carries a lever 15 on a joint 14.
  • the mass 9 is attached. Their weight acts on the load carrier 2 via a tension band 16 which is articulated both on the load carrier 2 and on the lever 15.
  • the present has the advantage that the mass 9 can be made smaller, as a result of which the weight of the scales is reduced.
  • FIG. 3 A further exemplary embodiment is shown in FIG. 3.
  • the lower part of the force meter is known from CH patent application 03040 / 87-4. He be stands from a base plate 32 on which a frame 21 is attached. Two plates 25, 28 articulated on this frame 21 and with band joints 26, 27 on a load carrier 22.
  • a stilt 17 runs diagonally through the parallel guide formed by the elements mentioned, which transmits the forces to be measured to the dynamometer 7.
  • a weighing plate 36 is attached to the load carrier 22, which in turn carries the mass 9.
  • the weighing sample is again symbolized by the weight stone 8.
  • the hard restraint takes place here also via the stilt 17 and the dynamometer 7.
  • a stop 35 is provided in order to protect the elastic parallel guide against overload.
  • the connection from the dynamometer 7 to the computer 10 again takes place via the cable 11.
  • the weight of the mass 9 is again introduced via a translation.
  • On the upper plate 23, one end of a lever 18 is attached, which carries the mass 9 at its other end.
  • the other parts of the scales are the same as in the exemplary embodiment according to FIG. 3.
  • the exemplary embodiment according to FIG. 5 is based - for example - on that according to FIG. 3.
  • the inventive concept also includes building on the exemplary embodiment according to FIG. 4.
  • a supporting structure for example a plate 29, is fastened on the load carrier 22 here.
  • This plate 29 carries four pins 30 (only two of them are shown in FIG. 5 because of the side view). These pins 30 are inserted into suitable fits 31, which are attached to the underside of a weighing pan 37, which can now be removed.
  • the four pins 30 are the only mechanical parts which are led out of a closed casing 38 through openings 39.
  • the weighing pan 37 is not part of the reference mass here. It is further included in the inventive concept to provide the plate 29 with a number of pins 30 which differs from four. In the case of a round weighing pan 37, three pins 30 prove to be useful; when using a small weighing pan - as is usual with analytical balances - a single pin 30 is displayed. In the latter case, the plate 29 can be omitted and the pin 30 is attached directly to the load carrier 22. It goes without saying that this also means that Number - and possibly also the execution - of the fits 31 is changed accordingly.
  • FIG. 5 Another exemplary embodiment, not shown (the reference numerals refer to elements in FIG. 5), consists in that a plurality of dynamometers 7 - for example three of them - are fastened on a base plate 32.
  • Each dynamometer 7 carries in principle the same mass 9 on which a pin 30 is attached.
  • Each dynamometer 7 with its mass 9 is enclosed in a casing 38 with an opening 39 from which the pin 30 protrudes.
  • the number and arrangement of the pins 30 corresponds to a number and arrangement of fits 31 on the underside of a weighing bridge which is carried by the aforementioned dynamometers 7 with the aid of the pins 30.
  • Each dynamometer 7 is calibrated as described below.
  • the weight of the goods to be weighed is determined by adding up the weight results of the individual dynamometers in the computer 10.
  • the masses 9 can be dispensed with.
  • Both the calibration and the determination of the reference forces of the individual dynamometers are then essentially based on the mass of the weighing bridge alone.
  • a common prerequisite for all the exemplary embodiments mentioned is the use of a dynamometer 7 corresponding to the prior art, in which the force introduced is clearly converted into an electrical signal. If this is a digital electrical signal, such as in the case of piezo quartz or vibrating string transducers, further processing is carried out directly by the computer 10.
  • an AD converter is used between the dynamometer 7 and the computer 10 interposed.
  • Linearization and computational compensation of the temperature response of the dynamometer 7 or, if need be, of the entire dynamometer are still state of the art. The linearized and temperature-compensated balance is now verified by the manufacturer.
  • empty scale means "balance in reference state". For the exemplary embodiments according to FIGS. 1 to 4, this means literally: there is nothing on the laser carrier 2 or the weighing plate 36. For the exemplary embodiment according to FIG. 5, the weighing pan 37 is removed. When the scale is empty and horizontal, the computer (10) determines a reference value Ri or R2.
  • the values determined by the computer (10) are M 1 and M 2 . These four values are first stored in a read-only memory assigned to the computer (10).
  • R 1 V + a (g o + ⁇ g) m R cos ⁇ 1
  • R 2 V + a (g o + ⁇ g) m R cos ⁇ 2
  • V elastic preload
  • a proportionality factor m
  • ⁇ i angle of inclination of the balance
  • M 1 V + a (g o + ⁇ g ) (m R + m L ) cos ⁇ 1
  • M 2 V + a (g o + ⁇ g ) (m R + m L ) cos ⁇ 2
  • R 1 V + cm R (1)
  • M 1 V + c (m R + m L ) (3)
  • M 2 V + c (m R + m L ) ⁇ (1 + e) (4)
  • R x V + a (g o + ⁇ g) m
  • R cos ⁇ x V + ag (1 + h x ) m
  • the calibration values R 1 and L 1 and the mass value m L of the calibration weight have to be finally saved.
  • the sizes R 2 , M 1 , M 2 and L 2 can be deleted after the size P (G1. (12)) has been formed from them.
  • the zero value range can be symmetrical or asymmetrical, depending on the drift behavior and the calibration regulations.
  • the determination of the reference quantity R x is a prerequisite for each subsequent weighing when the computer 10 is switched on.
  • the weighing pan 37 must be removed in the exemplary embodiment according to FIG. 5.
  • the weight of the weighing pan 37 then effects the first weighing after the determination of the reference quantity R x and is automatically subtracted as a tare from all subsequent weighing results. If another weighing pan 37 is to be put on, the scales according to the invention return to the reference state, R x is determined again, and the weight of the new weighing pan 37 is stored as a new tare. Further tare operations, which are susceptible to the state of the art, must be carried out by the operator of the scale.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Cash Registers Or Receiving Machines (AREA)

Abstract

Une balance de mesure de masses réelles compare le poids des objets pesés (8) avec le poids d'une masse de référence. La force de référence se compose du poids effectif d'une masse (9) et d'autres composants de la chaîne de transmission de force. Outre le poids, la force de référence peut inclure des précontraintes élastiques. Le poids de l'objet pesé (8) et la force de référence sont captés et mesurés par un seul dynamomètre (7) fermement fixé à la balance. La balance est étalonnée dans deux positions angulaires (horizontale et inclinée) et les poids (R1, R2, L1, L2) mesurés lorsque la balance n'est pas chargée et lorsqu'elle est chargée avec une masse d'étalonnage (mL) sont temporairement enregistrés dans la mémoire fixe de l'ordinateur (10). Les paramètres numériques ainsi dérivés caractéristiques de la balance sont enregistrés de façon permanente. Avant chaque pesage, ou au moins lors de chaque mise en service, la force de référence (Rx) est de nouveau déterminée. On peut ainsi déterminer avec précision la valeur massique réelle d'une masse que l'on veut peser à partir des valeurs enregistrées de façon permanente, de la force de référence et du poids (Lx) de la masse à peser, même lorsque la balance est en position inclinée.
PCT/CH1989/000007 1988-01-22 1989-01-12 Balance, son procede d'etalonnage et d'utilisation WO1989006785A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH21988 1988-01-22
CH219/88 1988-01-22

Publications (1)

Publication Number Publication Date
WO1989006785A1 true WO1989006785A1 (fr) 1989-07-27

Family

ID=4181989

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1989/000007 WO1989006785A1 (fr) 1988-01-22 1989-01-12 Balance, son procede d'etalonnage et d'utilisation

Country Status (3)

Country Link
EP (1) EP0352312A1 (fr)
JP (1) JPH02503036A (fr)
WO (1) WO1989006785A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993000575A1 (fr) * 1991-06-24 1993-01-07 Wirth Gallo Messtechnik Ag Cellule de mesure de charge a deux points
EP0940659A1 (fr) * 1998-03-05 1999-09-08 Balea S.A. Procédé de réglage des angles appliqué à des récepteurs de charge et disposif pour sa mise en oeuvre

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2531672A1 (de) * 1975-04-01 1976-10-14 Wirth Gallo & Co Massen- und kraftmessgeraet
US4156361A (en) * 1976-01-14 1979-05-29 Sartorius-Werke Gmbh Calibratable electromagnetically compensating balance
US4196784A (en) * 1977-08-01 1980-04-08 Tokyo Electric Company, Limited Weighing scale with load cell
US4258811A (en) * 1975-09-16 1981-03-31 Ab Bofors Electric mass and force measuring apparatus
US4375838A (en) * 1980-07-17 1983-03-08 Shimadzu Corporation Electronic balance
GB2139768A (en) * 1983-05-09 1984-11-14 Setra Systems Inc Weighing system
DE3514826C2 (fr) * 1985-04-18 1987-03-19 Yamato Scale Co. Ltd., Akashi, Hyogo, Jp

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2531672A1 (de) * 1975-04-01 1976-10-14 Wirth Gallo & Co Massen- und kraftmessgeraet
US4258811A (en) * 1975-09-16 1981-03-31 Ab Bofors Electric mass and force measuring apparatus
US4156361A (en) * 1976-01-14 1979-05-29 Sartorius-Werke Gmbh Calibratable electromagnetically compensating balance
US4196784A (en) * 1977-08-01 1980-04-08 Tokyo Electric Company, Limited Weighing scale with load cell
US4375838A (en) * 1980-07-17 1983-03-08 Shimadzu Corporation Electronic balance
GB2139768A (en) * 1983-05-09 1984-11-14 Setra Systems Inc Weighing system
DE3514826C2 (fr) * 1985-04-18 1987-03-19 Yamato Scale Co. Ltd., Akashi, Hyogo, Jp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993000575A1 (fr) * 1991-06-24 1993-01-07 Wirth Gallo Messtechnik Ag Cellule de mesure de charge a deux points
EP0940659A1 (fr) * 1998-03-05 1999-09-08 Balea S.A. Procédé de réglage des angles appliqué à des récepteurs de charge et disposif pour sa mise en oeuvre

Also Published As

Publication number Publication date
JPH02503036A (ja) 1990-09-20
EP0352312A1 (fr) 1990-01-31

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