WO2021175963A1 - Behälter- oder plattformwaage - Google Patents
Behälter- oder plattformwaage Download PDFInfo
- Publication number
- WO2021175963A1 WO2021175963A1 PCT/EP2021/055405 EP2021055405W WO2021175963A1 WO 2021175963 A1 WO2021175963 A1 WO 2021175963A1 EP 2021055405 W EP2021055405 W EP 2021055405W WO 2021175963 A1 WO2021175963 A1 WO 2021175963A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- individual signals
- container
- load cells
- scale
- weighing
- 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
Links
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
- G01G21/22—Weigh pans or other weighing receptacles; Weighing platforms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
- G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
- G01G23/37—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting
- G01G23/3707—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting using a microprocessor
Definitions
- the invention relates to a container or platform scale whose weighing platform or weighing container is placed on three or four analog weighing cells, with a summing device that sums up the individual signals of the weighing cells to form an overall signal, and with an evaluation device that determines a weight value from the overall signal and uses this issues.
- Industrial container or platform scales consist of ei ner weighing electronics (evaluation device), z. Sometimes with on-site display and a weighing container (e.g. silo) or a weighing platform, which are available on three or four load cells, depending on the design.
- Analog load cells with strain gauges (DMS) in a bridge circuit are primarily used. The load cells are connected via electrical lines to a junction box in which the strain gauge bridge circuits are connected in parallel so that the analog measurement signals (individual signals) from the load cells are added to form a total signal.
- the overall signal is passed on to the evaluation device via a signal cable, which among other things. contains a measuring amplifier and an analog / digital converter and evaluates the total signal of the load cells to a weight value and displays this and / or transmits it to a higher-level controller.
- the invention thus provides a container or platform scale whose weighing platform or weighing container is placed on three or four analog load cells, with a sum device that sums up the individual signals of the load cells to form an overall signal, and with an evaluation device that derives from the overall signal determines a weight value and outputs it, characterized in that the summing device is designed for the retroactive addition of the individual signals and that the evaluation device contains an analog / digital converter for digitizing the individual signals of the load cells and a diagnostic device that adds the digitized individual signals Evaluates diagnostic information and outputs the diagnostic information.
- the summing device can comprise an analog summing amplifier (inverting adder) with an operational amplifier, which adds the individual analog signals in a reaction-free manner. Since the individual signals are digitized for the digital diagnosis evaluation, the summing device can be formed as an alternative to the addition of the digitized individual signals.
- the diagnostic device can be designed to receive information about the distances between the load cells or the contact points of the weighing platform or the weighing container and to determine and output the center of gravity of the balance from this information and the digitized individual signals from the load cells.
- the information about the distances between the Wägezel len or touchdown points of the weighing platform or the Wägebenosl age can, for. B. can be entered by an operator or setter of the scales via a suitable user interface. the.
- the determined center of gravity of the scales in particular its lateral coordinates parallel to the dividing surface, can be output visually, in particular graphically, via the same user interface.
- the focal point distribution can also be displayed without an input by outputting the values of the digitized individual signals or their graphic representation, for example in the form of a bar chart.
- the automatic determination of the center of gravity makes it easier to set up and align the scales, whereby force shunts or lateral forces can also be recognized.
- the diagnostic device is preferably designed to store the position of the determined center of gravity of the unloaded scale in a memory and to determine and determine the position of the center of gravity of the loaded scale and / or a load on the scale as a deviation from the stored center of gravity of the unloaded scale to spend. In this way, z. B. Information about the material distribution in the weighing container or shifts in the center of gravity in the event of subsequent changes, modifications or additions to the container.
- Force shunts on the load cells and / or the risk of the weighing container or load being lifted off in the wind or due to other external influences can be detected in an advantageous manner by using the values of the digitized individual signals obtained with the unloaded scales as zero point values of the load cells concerned stored in the memory and the digi talized individual signals obtained during operation of the scale are compared with each other after subtracting the associated zero point values.
- force shunts for example, the ratios of the individual weight values on the load cells to one another change, so that in the event of large deviations, a warning can be issued with an indication of a possible force shunt and thus a faulty measurement.
- the risk of the container or the scales being lifted off can be reduced by monitoring the individual weight values the load cells are recognized in comparison to the zero point values, i.e. when the load on a load cell or neighboring load cells becomes zero compared to the zero point (dead load) or changes its direction of action from a pressure load to a tensile load.
- the diagnostic device can determine the corner load error of the scales from the values of the digitized individual signals obtained when the scales are loaded at different points with one and the same calibration weight and use this to calculate correction factors for the individual signals to be added to the overall signal.
- the evaluation device is preferably designed to detect the failure of individual load cells by monitoring the impedances of the connected load cells; the diagnostic device then uses the digitized individual signals of the intact load cells to calculate substitute values for the individual signals of the respective failed load cells and makes them available for determining the weight value of the load to be measured.
- the diagnostic device can be designed to evaluate the frequency content of the individual signals and to extract and output information about dynamic weighing processes or treatments of goods to be weighed on the scales therefrom. This makes it possible without additional sensors z. B. to monitor a dosing process or the mixing of the medium in the weighing container by means of a stirrer or to perform an automatic calculation of filter parameters of a filter with which the individual signals summed up to determine the Ge weight value are filtered.
- the invention is based on perennialsbeispie sources and tert erläu with reference to the figures of the drawing; show in detail
- Fig. 3 shows another example of the Ausenseinrich device
- Fig. 4 and 5 examples of a visualization of diagnostic information.
- the container 1 shows a container scale 1 with a weighing container 2 which is set up on three analog weighing cells 3.
- the weighing container 2 shown is a stirred tank with an agitator 4.
- the container 2 can, however, also be a silo, a tank, a filling funnel or the like.
- Four load cells can also be used, e.g. B. if the container 2 or a Wä platform, not shown here, have a square or rectangular base instead of the container.
- the load on the load cells 3 through the entire mechanical structure without the payload to be measured, here z. B. the medium in the container 2 is at rest, is referred to as dead load.
- the load cells 3 are connected via lines 5 to an evaluation device (electronic weighing system) 6 in which a summing device 7 adds up the individual signals 8 of the load cells 3 to form a total or sum signal 9.
- a computing unit 10 of the evaluation device 6 determines a Ge weight value 11 from the overall signal 9, which is displayed on a display 12 of the scale 1 for a user 13 and / or otherwise via a connection 14 for the purpose of control, documentation, display, readout. Invoice or the like to a higher-level device or control 15 is transmitted.
- the display 12 is part of a user interface 16, which also has means 17 for entering information about the scale 1, such as. B. the Po positions of the load cells 3 has.
- the evaluation device 6 also contains a monitoring device 18 which measures and monitors the impedances of the connected weighing cells 3 in order to detect a failure of individual weighing cells 3 or a line break or short circuit in the lines 5.
- the evaluation device 6 contains an analog-to-digital converter 19, which digitizes the individual signals 8 of the load cells and feeds them to a diagnostic device 20, which determines diagnostic information 21 from the digitized individual signals 8 and displays them on the display 12 for the user 13 and / or possibly transmitted to the higher-level device 15.
- Fig. 2 shows an embodiment of the evaluation device 6, in which the individual signals 8 of the here z. B. four load cells 3 are digitized in the analog / digital converter 19 and then fed to both the diagnostic device 20 and the here digital summing device 7.
- the computing unit 10 determines the weight value 11 from the total digital signal supplied by the summing device 7.
- the diagnostic device 20 contains several diagnostic modules 20 ', 20'',20''' which convert the digitized individual signals 8 into different diagnostic information 21 ', 21'',21''' process.
- the diagnostic device 20 can be controlled by the monitoring device 18, which measures the impedances of the connected load cells 3, in order to generate substitute values, e.g. B. 21 ''', to calculate for the individual signals 8 of the respective failed load cells 3 and to provide for the determination of the weight value 11
- each of the analog load cells 3 contains strain gauges (DMS) 22 in a bridge circuit 23.
- DMS strain gauges
- Fig. 3 shows a further embodiment of the evaluation device 6, in which, in contrast to the example of FIG. 2, the individual signals 8 of the load cells 3 are added in an analog summing amplifier (inverting adder) 24 and then in an analog / digital converter 25 digitized and fed to the computing device 10.
- the exemplary embodiment does not differ in principle from that according to FIG. 2, and here, too, a monitoring device measuring the impedances of the connected load cells 3 can be present, which is not shown for the sake of clarity.
- the mechanics of the scale 1 are decisive for the measurement result because the most common errors can occur here in practice, both in the construction and in the operation of the scale.
- When setting up the scale make sure that approximately the same load acts on all load cells 3 or the contact points of the weighing container 2 or the weighing platform. If z. B. the focus of the balance is not centric or the load cells are not all directed equally high and flat, so that z. B. a balance is only on two of four load cells, it can lead to an overload of individual load cells, while other load cells may be negative, ie on train, be claimed. It is also important to ensure that no force shunts are present or occurring, i.e.
- the diagnostic modules 20 ', 20 ", 20"' of the diagnostic device 20 can perform different monitoring and diagnostic tasks in order to assist the user during commissioning, maintenance or operation of the scales 1 and to give him information about the current status of scale 1.
- the scale 1 has four load cells 3.
- the zero point of the unloaded scale 1 is recorded, the zero point values JOWn obtained being stored in a memory 26 (FIGS. 2 and 3) of the diagnostic device 20.
- the user 13 can use the input means 17 to add information about the relative positions of the load cells W1, W2, W3 and W4. input each other into the evaluation device 6, it being possible for this information to be shown graphically on the display 12 of the user interface 16.
- Fig. 4 shows this by way of example for a container 2 with a quadratic base area and a side length a.
- the diagnostic device 20 calculates the positions or lateral coordinates (xn, yn) of the individual load cells Wn from this information:
- (x4, y4) (-f, + f) and furthermore the coordinates (x s o, yso) of the center of gravity SO of the unloaded scale 1 to: xl-JOWl + X2-J0W2 + X3-J0W3 + X4-J0W4 and yl-JOWl + y2-J0W2 + y3-J0W3 + y4-J0W4 yso— J0W1 + J0W2 + J0W3 + J0W4
- the position of the center of gravity SO of the unloaded scale 1 can, as shown by way of example in FIG. 4, be visualized on the display 12.
- the center of gravity SO lies at the intersection of the x and y axes, which correspond to the axes of symmetry of the balance 1 and of the container 2.
- Different tolerance areas 27, 28 can indicate whether the determined center of gravity can be tolerated for operation of the scale 1.
- the determination of the center of gravity SO and its visualization make it easier to set up and align the scale 1, and shunts or transverse forces can also be recognized.
- the way of visualization can of course vary greatly. take place differently. So it is z.
- the zero point values J0W1, J0W2, J0W3 and J0W4 in the form of bars in a bar chart, with the deviations of the individual bars from the mean value of the zero point values indicating the need for adjustment on the associated load cells Wl, W2, W3 and W4.
- Fig. 5 shows an example of the visualization of the center of gravity in a scale with three load cells W1, W2 and W3.
- the determined coordinates (x s o, YSO) of the center of gravity of the unloaded SO weighing machine 1 are stored in the memory 26th This makes it possible during operation of the balance 1 focusing ⁇ point S of the medium in the weighing 2 or the payload on the weighing platform to monitor. This is achieved in that the diagnostic device 20 or one of its modules 20 ', 20'',20''' the location (x s, y s) of the center of gravity S determines the burden ⁇ th weighing machine 1 as follows: xl-DWI + X2-DW2 + X3-DW3 + X4-DW4
- the center of gravity monitoring can, for. B. serve to detect early bridges or caking on the inner wall of the weighing container 2 in bulk goods. But it also makes it possible, for example, to detect loads on the scales caused by wind forces.
- the interpreter can at least be displayed division by z.
- the measurement, zero ⁇ or adjustment values DWn, JOWn, JlWn of the load cells Wl, W2, W3 and W4 are output immediately or in the form of a graphic representation, e.g. B. in a column chart.
- Force shunts can be detected within the framework of the diagnosis by comparing the digital measured values DWn of the individual load cells Wn, preferably adjusted for the zero point values JOWn, with diagnostic information 21 being issued as a warning if there are large differences between the measured values DWn.
- the risk of the container scale 1 lifting off due to wind forces is recognized by monitoring the digital measured values DWn of the individual load cells Wn in comparison to the zero point values JOWn.
- An indicator of this is when e.g. B.
- the digital measured value DWn adjusted for its zero point value JOWn becomes zero or negative.
- the diagnostic device 20 can be controlled by the monitoring device 18, which measures the impedances of the connected load cells 3, in order to generate substitute values 21 '' 'for the individual signals 8, more precisely the corresponding digital measured values DWn, of the respective failed load cells 3 to be calculated and to provide for the determination of the weight value 11.
- a mean value can be calculated from the digital measured values DW1, DW3, DW4 of the other load cells Wl, W3, W4 and used as a substitute value for the defective load cell W2:
- Adjustment can also be made on the basis of the adjustment values JlWn, which were determined when the balance 1 was loaded with a calibration weight and which are also stored in the memory 26:
- a calibration weight e.g. B. 100 kg, placed one after the other on the three corner points of the scale 1, ie at the points of the load cells 3, whereby the Justa values J1W1, J1W2, J1W3 are obtained.
- These adjustment values can be different due to different sensitivities of the load cells 3 un different.
- the adjustment values are now adjusted by the zero point values JOWn from memory 26:
- AWl J1W1-J0W1
- AW2 J1W2-J0W2
- AW3 J1W3-J0W3
- the smallest value here e.g. B. AW3 selected.
- correction factors Fn for the individual signals 8 to be summed up to form the overall signal 11 are calculated and stored in the memory 26 as follows:
- the individual signals to be summed up are 8, here z.
- the digital measured values DWn adjusted for the zero point values JOWn are multiplied by the calculated factors Fn in order to obtain measured values DWEn that are adjusted to the corner load:
- the measured values DWEn which have been adjusted for off-center loads, are finally added in the digital summing device 7 (FIG. 2) to form a total signal DWE1 + DWE2 + DWE3, which represents the weight value 11.
- the frequency contents of the digitized individual signals 8 can be evaluated in one of the diagnostic modules 20 ', 20 ", 20"' and information about dynamic weighing processes or treatments of weighing goods on the scales 1 can be extracted and output therefrom.
- the agitator 4 (Fig. 1) in the container 2 vibrations and Schwingun conditions that are picked up by the load cells 3 and are reflected in the individual signals 8.
- fre quenzanalysis z. B. Fourier transformation
- the digitized th individual signals can, for. B.
- the rotational frequency of the agitator 4 is extracted and, if necessary, the direction of rotation can be detected on the basis of phase shifts of the individual signals.
- the frequency spectrum also allows conclusions to be drawn about the technical state of the agitator 4. Based on the amplitude of the signal components correlating with the speed, z. B. the state of the medium in the weighing container 2 can be checked or estimated in a mixing or reaction process who the when this process will be ended.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Measurement Of Force In General (AREA)
- External Artificial Organs (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112021000330.5T DE112021000330A5 (de) | 2020-03-04 | 2021-03-03 | Behälter- oder Plattformwaage |
| CN202180018625.9A CN115210542B (zh) | 2020-03-04 | 2021-03-03 | 容器秤或平台秤 |
| US17/908,778 US12455188B2 (en) | 2020-03-04 | 2021-03-03 | Container or platform scales |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020202797.8A DE102020202797A1 (de) | 2020-03-04 | 2020-03-04 | Behälter- oder Plattformwaage |
| DE102020202797.8 | 2020-03-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2021175963A1 true WO2021175963A1 (de) | 2021-09-10 |
Family
ID=74873707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2021/055405 Ceased WO2021175963A1 (de) | 2020-03-04 | 2021-03-03 | Behälter- oder plattformwaage |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12455188B2 (de) |
| CN (1) | CN115210542B (de) |
| DE (2) | DE102020202797A1 (de) |
| WO (1) | WO2021175963A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022158438A1 (ja) * | 2021-01-22 | 2022-07-28 | 株式会社 エー・アンド・デイ | 計量装置 |
| CN112880800A (zh) * | 2021-03-25 | 2021-06-01 | 梅特勒-托利多(常州)精密仪器有限公司 | 具有冗余设计的数字称重传感器 |
| US20250283753A1 (en) * | 2024-03-11 | 2025-09-11 | Veton Krasniqi | Portable Scale Device |
Citations (3)
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|---|---|---|---|---|
| DE3409202A1 (de) * | 1984-03-14 | 1985-09-19 | Soehnle-Waagen Gmbh & Co, 7157 Murrhardt | Waage |
| US5805467A (en) * | 1996-07-02 | 1998-09-08 | Richards; James L. | Weight measuring method using a plurality of sensors |
| US6002090A (en) * | 1995-06-16 | 1999-12-14 | Weigh-Tronix, Inc. | Force sensitive scale for fork lifts with electronically coupled load sensors |
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| US5167289A (en) * | 1991-04-30 | 1992-12-01 | Stevenson David L | Air spring load monitoring system |
| US5487603A (en) * | 1994-02-28 | 1996-01-30 | Lextron, Inc. | Intelligent system and process for automated monitoring of microingredient inventory used in the manufacture of medicated feed rations |
| DE29604635U1 (de) * | 1995-03-28 | 1996-05-30 | Sartorius AG, 37075 Göttingen | Waage mit einer oder mehreren DMS-Wägezellen |
| US6246967B1 (en) * | 1998-04-22 | 2001-06-12 | Interface Logic Systems, Inc. | Weight verification device |
| US6576849B2 (en) * | 2000-12-01 | 2003-06-10 | Mettler-Toledo, Inc. | Load cell diagnostics and failure prediction weighing apparatus and process |
| DE10120978A1 (de) * | 2001-05-01 | 2002-11-14 | Bizerba Gmbh & Co Kg | Vorrichtung und Verfahren zur Erfassung und Aufbereitung von auf einen Fahrzeugsitz wirkenden Gewichtskräften |
| US7126065B2 (en) * | 2002-11-14 | 2006-10-24 | Measurement Limited | Weighing scale adapted for allowing a user to find an optical weighing position on the scale |
| US7480579B2 (en) * | 2003-06-30 | 2009-01-20 | Caterpillar Inc. | Method and apparatus for performing temperature compensation for a payload measurement system |
| FR2880112B1 (fr) * | 2004-12-23 | 2007-02-09 | Seb Sa | Pese-personne |
| CN101363750B (zh) * | 2008-07-23 | 2010-06-30 | 余姚太平洋称重工程有限公司 | 大吨位料位电子秤的无砝码称量校正方法 |
| FR2942537B1 (fr) * | 2009-02-20 | 2012-08-31 | Agrotronix | Remorque dotee d'un dispositif de pesee embarque, et procede de pesee correspondant. |
| US8237066B2 (en) * | 2009-12-30 | 2012-08-07 | Mettler-Toledo, LLC | Weighing apparatus employing load cells of different capacity |
| US8581734B2 (en) * | 2010-01-11 | 2013-11-12 | Antonio Ozamiz Tapia | Management system for managing bulk material inside a silo using a set of load cells and an accelerometer |
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| CN108955852B (zh) * | 2017-05-26 | 2024-08-13 | 梅特勒-托利多(常州)测量技术有限公司 | 偏重检测方法及平台秤 |
| CN107961014B (zh) * | 2017-12-29 | 2024-01-30 | 新绎健康科技有限公司 | 身体平衡秤 |
| CN108801407A (zh) * | 2018-08-02 | 2018-11-13 | 梅特勒-托利多(常州)测量技术有限公司 | 称重装置、称重方法、称重传感器以及存储介质 |
| KR20190066540A (ko) * | 2018-08-31 | 2019-06-13 | 주식회사 토브스 | 가축용 발판형 체중계 |
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-
2020
- 2020-03-04 DE DE102020202797.8A patent/DE102020202797A1/de not_active Ceased
-
2021
- 2021-03-03 DE DE112021000330.5T patent/DE112021000330A5/de active Pending
- 2021-03-03 WO PCT/EP2021/055405 patent/WO2021175963A1/de not_active Ceased
- 2021-03-03 US US17/908,778 patent/US12455188B2/en active Active
- 2021-03-03 CN CN202180018625.9A patent/CN115210542B/zh active Active
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| DE3409202A1 (de) * | 1984-03-14 | 1985-09-19 | Soehnle-Waagen Gmbh & Co, 7157 Murrhardt | Waage |
| US6002090A (en) * | 1995-06-16 | 1999-12-14 | Weigh-Tronix, Inc. | Force sensitive scale for fork lifts with electronically coupled load sensors |
| US5805467A (en) * | 1996-07-02 | 1998-09-08 | Richards; James L. | Weight measuring method using a plurality of sensors |
Also Published As
| Publication number | Publication date |
|---|---|
| US12455188B2 (en) | 2025-10-28 |
| DE102020202797A1 (de) | 2021-09-09 |
| DE112021000330A5 (de) | 2022-10-06 |
| CN115210542A (zh) | 2022-10-18 |
| CN115210542B (zh) | 2025-10-24 |
| US20230184581A1 (en) | 2023-06-15 |
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