ZA200507233B - Method and device for calibrating a weighing device, especially a weighing hopper - Google Patents
Method and device for calibrating a weighing device, especially a weighing hopper Download PDFInfo
- Publication number
- ZA200507233B ZA200507233B ZA200507233A ZA200507233A ZA200507233B ZA 200507233 B ZA200507233 B ZA 200507233B ZA 200507233 A ZA200507233 A ZA 200507233A ZA 200507233 A ZA200507233 A ZA 200507233A ZA 200507233 B ZA200507233 B ZA 200507233B
- Authority
- ZA
- South Africa
- Prior art keywords
- calibration
- weighing device
- weighing
- load
- producing means
- Prior art date
Links
- 238000005303 weighing Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005259 measurement Methods 0.000 claims description 21
- 239000002775 capsule Substances 0.000 claims description 13
- 238000011156 evaluation Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000009434 installation Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000000275 quality assurance Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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
- 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
- G01G13/26—Weighing mechanism control arrangements for automatic feed or discharge involving fluid-pressure systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to a device (4) and a method for calibrating weighing devices, such as weighing hoppers (1). The weighing device is loaded for the calibration process on the basis of a calibration device (4) that can be detachably connected to a weighing device, said calibration device being a mobile device (4). The invention renders superfluous complex devices for loading the weighing device or load measuring devices of the same.
Description
The invention relates to an apparatus and a method for ca libration of a weighing device, in particular for a we ighing hopper, having at least one load measurement device.
We ighing devices are frequently used for storage and metering of process substances im the field of me tallurgical installation design. The object of these weighing devices is to achieve a quantitative recording by- weighing the process substances, and to control the supply of the respective substance on the basis of this information.
Im principle, weighing devices such as these are based ora measurements by, for example, load measurement cells, with the load being dedwiced from local deformation in the measurement cell. Load measurement cells such as these must be calibrated for correct operation. It is known for a known load situation to be produced for this purpose, by application of accurately defined masses. The load measuremen t devices can be calibrated on the basis of this load. This means that a correlation is produced between a load and a measured value determined by a load measurernent device. This correlation allows an unambiguous and quantitatively reeliable measurement to be carried out by means of the load measurement devices, which have now been calibrated.
This correlation is normally determined during the course of a calibration process during the setting up of the weighing device, and is then carried out repeatedly at precisely defined time intervals. These time intervals are chosen to correspond to the measurement devices being used and to the technical systems being used, and may be between a few weeks and about half a year. Simplification of the calibration process thus offers a major improvement pote=ntial.
In this case, in particular, the calibrat ion of load measurement cells for metallurgical installation construction, where very large masses also have to be measured and controlled, is difficult, time-consuming and thus also expensive. Because of the ver—y large test masses that are required, this results in time- consuming and difficult manipulations foesr the test masses which are used for calibration of the load measurement cells. The costly and i nstallation- intensive apparatuses which are recquired for manipulation of the test masses are also disadvantageous.
One obj ect of the invention is to further develop a method and an apparatus for calibration irm such a way that a considerably simpler, more cost-effective and reliable solution is found for calibration of weighing devices .
This ob ject is achieved on the basis of tZhe apparatus accordirg to the invention as claim-ed in the characterizing part of claim 1, and on the basis of the method according to the invention as cla imed in the characterizing part of claim 10.
The capability to apply a variable load loy the force producimg means has been found in parti-cular to be advantageous during use, since this also makes it possible to simulate different load states on a weighing device. Furthermore, the load pro«duced by the variable-force force producing means can be= adjusted as requirec for use on different weighing devieces.
The so lution according to the inventioen makes it possible to save complex test devices , with the calibra tion process being carried out in a shorter time m3 PIE GI £09233 and at less cost. ov
One advantageous embodiment of the apparatus according to the invention provides for the use of a portable yoke. This allows quick connection of the force producing means to the weighing device and to the steel structure of the device. Brackets are provided on the steel structure of the weighing devAdce for this purpose, via which the force producing means can be connected in a simple manner.
The apparatus according to the invention may also include at least one calibration capsule. which can be inserted in the portable yoke and can be loaded in the process. This extension to the apparatus according to the irmvention makes it possible, during the course of the calibration process, to compare the measured load on a MAoad measurement cell in the weighimrxg devices with the measured load on a calibration capsule. This additional measurement variable allows particularly accurate and precise, reproducible calibration.
Accurate calibration capsules with a measurement-range according to the load range are used for this purpose, which also have a calibration rail, so that the applied loads can be recorded precisely and can be used as varialoles for the calibration process.
According to one preferred embodiment of the apparatus according to the invention, this apparatus is detachably connected to the weighing dewice. For this purposse, the entire apparatus according to the invention is designed such that it DOs mounted as required on the weighing device whose measurement device is to be calibrated, and the caliloration process is carried out. The yoke together with the calibration capsule 1s suspended in brackets which are provided on the weighing device and on its steel structure. Once the «alibration process has been carried out, the apparatus according to the invention 1s w»xemoved so that a it can also le used for further weighing devic es, or can be used once again when required on the weighing device.
One advantageous embodiment of the apparatus pr-ovides for hydraulic operation of the force producing means.
The use of hydraulic operation results in a very compact embodiment of the apparatus. Furthermore, hydraulic foxce producing means are very highly suitable for applying precisely controllable and, if required, also very heavy loads, with the force producing means having compact dimensions, ane« thus simulating high masses.
One particular: embodiment of the apparatus according to the inventiom is achieved by using a hydraulic cylinder, whi.ch acts on the device by means of a tension or pressure load, as the force producing means.
This measure rnakes it possible to overcome restrictions for the fitting of the apparatus for calibrati.on, as appropriate for the local conditions, for example for a steel structure, or design-dependent restriction. The apparatus can thus likewise be flexibly matched to the calibration task, in which case it is possible t« match the number of hydraulic cylinders that are used to the requirements.
One particularly advantageous embodiment of the apparatus acc ording to the invention provides =for the hydraulic cyl.inder to be fitted between the peortable yoke and an opposing bearing, with this opposing bearing being mounted fixed on the supporting st. ructure of a device to be calibrated, for example a weighing hopper. The -—vyoke is suspended in a bracket which is welded fixed to the steel structure of the weighing device. The h.ydraulic cylinder engages in this yoke and in the opposing bearing. This form of mounting results in the hydr-aulic cylinder being fixed easily and securely. The arrangement of the calibration carssule in the yoke in conjuriction with a cylinder having a pulling effect makes it possible to apply an advantageous pressure load on the calibration capsule, so that it is not necessary to choose a special version
S of the calibration capsule, as is required for tensile loads, for example.
A further advantageous embodiment provides for the force producing means to be supplied by a mobile, hydraulic pump. In order to provide a light and mobile apparatus for caliloration, it is also necessary to provide the apparatus with a supply which is largely independent of the existing media infrastructure. This is achieved on the one hand by the hydraulic pump that has been introduced and in particular by pumps which can be operated manually, and which represent a particularly light embodiment. This results in a highly cost-effective and highly transportable solution, which also complies with all of the requirements, for example even for use with vexy large weighing installations.
A further preferred embodiment of an apparatus according to the invention has an electronic evaluation unit. The use of an evaluation unit such as this advantageously makes it possible to record variables measured during the calibration process, and to make them available fox further processing. Electronic processing also makes it possible to comply with all the requirements for documentation such as those defined, for example, in the quality assurance regulations. This 1 ikewise provides evidence that the calibration process has been carried out correctly.
On the basis of the method according to the invention, the load is applied only for calibration purposes. The use of an apparatus which can be detachably connected to the weighing dev ice means that there is no need to provide expensive permanent apparatuses on the device to be calibrated. The calibration process is carried out. as required or else in accordance witlhyx a procedure which, for example, is defined by a test instruction or else by a quality assurance rule, makirig use of a moloile apparatus which is provided for this purpose.
Furthermore, different devices to be calibrated can be calibrated in turn with very littl e apparatus complexity. The time required for the process itself cana in this case be shortened, while reliably complying with all of the calibration accuracy requirements.
A very precise method is achieved by fitting the apparatus for calibration as close as possible to the measurement cells to be calibrated while carrying out the method, since this makes it possible to very laxgely preclude discrepancies or load errors.
A further advantageous refinement of the method provides for the use of an electronic evaluation appliance. This ensures a reproducible and precisely documented method for calibration, which also complies with all of the requirements relating to accuracy and the demands of a quality assurance system. Measured da ta (pressures, times, loads, calibration data) and, if appropriate, reference data is or are in this case recorded electronically, and is available for further evaluations, in which case evaluation can also be carried out directly during the calibration process.
This is a very important precondition for ensuring a re liable and trustworthy method, with the reproducibility also being documented.
The invention will be described in more detail with reference to the following figures:
Figure 1 shows an arrangement of the apparatus for calibration on a weighing hopper ,
Figure 2 shows details of the apparatus for calibration, and
- 7 =
Figure 3 shows a hydraulic schematic for actuation of the hydraulic cylinder for the apparatus for calibration.
Figure 1 shows a weighing device, in this case in the form of a weighing hopper 1, with the associated steel structure 2. The weighing hopper 1 is supported on a steel structure 2, which is indicated. The load measurement devices 3 of the weighing device 1 are also inserted in this steel structure 2. The indicated mobile apparatus for calibration 4 is connected between brackets 6, which are fixed to the steel structure 2, and brackets 10 which are fixed to the weighing device 1. The mobile apparatus for calibration 4 will be described and explained in more detail with reference to Figure 2. As illustrated in Figure 1, the apparatus for calibration 4 may comprise a plurality of elements 4 in which case, as illustrated in more detail in
Figure 2, these each comprise at least one hydraulic cylinder 9, one yoke 7 and one calibration capsule 8.
For this purpose, the required number of elements 4 are fixed on brackets 6 and 10 provided for this purpose.
An associated electronic evaluation appliance is not illustrated in any more detail here. However, instead of a central electronic evaluation appliance, it is also possible to use a plurality of electronic evaluation appliances which are each associated with the elements 4. The associated pressure supply for the hydraulic cylinder 9 is likewise not illustrated in
Figure 1.
Figure 2 illustrates the major parts of the mobile apparatus for calibration 4, in detail. The mobile yoke 7 is suspended in a bracket 6 which is part of the steel structure o¥ the weighing device. The mobile yoke 7 has a holder in which a calibration capsule 8 can be inserted. The hydraulic cylinder 9 in this arrangement applies a tensile force between the brackets 6 and 10.
In this case, the calibration c-apsule 8 is subject to a pressure load, so that it is poossible to use standard measurement capsules for the ca libration capsule 8. The hydraulic cylinder 9 is firmly connected to the steel structure 2 via a bearing poirmt 11 on the bracket 10 that is provided.
Figure 3 shows one possible emloodiment of a scheme for supplying power and for feeding the hydraulic cylinder 9 for the elements 4. The indicated scheme in this case relates to an apparatus for calibration 4, with three elements 4. The indicated pump 12 may, for example, also be in the form of a simple hand pump. In the illustrated layout, all of the hydraulic cylinders are loaded with the same pressure, although the invention is not restricted to this embodiment. Unequal loads may likewise be applied in order ira this way to comply with specific requirements.
The apparatus for calibratiom 4 as illustrated in
Figures 1 and 2 may also, as already stated above, comprise a plurality of elememrmts 4, in which case it has been found to be advantageous for the apparatus for calibration 4 or its elements 4 to be arranged close to the load measurement devices 3 of the weighing device 1. The number of elements 4 is in this case chosen on the basis of the physical si tuation of the weighing device 1 and, in particular, of the arrangement of the load measurement devices 3. The brackets 6 and 10 which are provided on the steel structure 2 are fitted to correspond to the number of elements 4 that are used and to the overall structure of the weighing device 1.
The aim in this case is for a =ssimple embodiment and for good accessibility for installation and removal.
After installation of the element or elements 4 of the apparatus for calibration 4, the calibration capsules 8 are connected to one or more evaluation appliances, and the hydraulic cylinder or «ylinders 9 is or are
Cs 2003707233 connected to pressure producing dewices, such as hand pumps 12. The load is now applied by means of the hydraulic cylinders 9, and a weight- load is simulated.
A reliable and precise calibrati on process can be carried out by comparison of the measured values determined on the load measurement devices 3 with the measured values determined on the calibration capsules 8. The mobile and simple embodimermt of the apparatus for calibration 4 ensures that the calibration process is carried out easily and quickly, and the mobile apparatus for calibration can also be installed and removed very quickly and reliably.
Claims (15)
1. An apparatus for calibration of a weighing device, which has at least one variable-force force producing means for loading the weighing device, which can be engaged with the weighing device, characterized in that the force producing means comprises at 1 east one hydraulic cylinder for applying tension, in order to simul ate a weight load.
2. The apparatus as claimed in claim 1, char acterized in that the force producing means can be engaged with the weighing device by means of a portable yoke.
3. The apparatus as claimed in one of the above claims, characterized in that at least one calibration capsule, which can be inserted in the portable yoke, is also included.
4, The apparatus as claimed in one of the above claims, characterized in that the apparatus for calibration can be detachably connected to thes weighing device.
5. The apparatus as claimed in one of the above claims, characterized in that the hydraulic cylinder can be arranged between an opposing bearing and the yoke.
6. The apparatus as claimed in one of tthe above claims, characterized in that the power supply for the force producing means comprises a mobile, hydraulic pump «
7. The apparatus as claimed in one of the above claims, characterized in that data measured uring the calibration can be processed by means of an electronic evaluation unit. Amended 12 December 2006
A400981WO
8. The apparatus as claimed in one of the above claims, characterized din that the weighing device is a weighing hopper.
9. A method for calibration of a weighing device having at least one load measurement device, which is loaded by at least one variable-force force producing means and is calibrated on the basis of this load, characterized in that the force producing means comprises at least one hydraulic cylinder for applying tension, in order to simulate a weight load.
10. The method as claimed in claim 9, characterized in that the load is applied by the force producing means only for the process of calibration.
11. The method as claimed in one of claims 9 and 10, characterized in that the load is in each case introduced in the dmmediate vicinity of a load measurement device.
12. The method as claimed in one of claims 9 to 11, characterized in that the calibration is carried out using an electronic evaluation appliance.
13. The method as claimed in one of claims 9 to 12, characterized in that the weighing device is a weighing hopper.
14. An apparatus for calibration of a weighing device substantially as herein illustrated and exemplified with reference to the accompanying figures.
15. A method for calibration of a weighing device substantially as herein illustrated and exemplified with reference to the accompanying figures. Amended 12 December 2006
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0052803A AT413763B (en) | 2003-04-04 | 2003-04-04 | METHOD AND DEVICE FOR CALIBRATING A WEIGHING DEVICE, IN PARTICULAR A WEIGH BUNKER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200507233B true ZA200507233B (en) | 2006-12-27 |
Family
ID=33102751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200507233A ZA200507233B (en) | 2003-04-04 | 2004-02-27 | Method and device for calibrating a weighing device, especially a weighing hopper |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP1639328B1 (en) |
| KR (1) | KR101107483B1 (en) |
| CN (1) | CN100408987C (en) |
| AT (2) | AT413763B (en) |
| BR (1) | BRPI0408572A (en) |
| DE (1) | DE502004001624D1 (en) |
| PL (1) | PL213642B1 (en) |
| RU (1) | RU2328705C2 (en) |
| UA (1) | UA83829C2 (en) |
| WO (1) | WO2004088259A1 (en) |
| ZA (1) | ZA200507233B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU91113B1 (en) | 2004-10-18 | 2006-04-19 | Wurth Paul Sa | Method and device for calibrating a weighing system of a hopper |
| US8097213B2 (en) * | 2007-10-24 | 2012-01-17 | Intercat Equipment, Inc. | Calibration system, material delivery system, and methods for such delivery and calibration |
| EP2216635B1 (en) | 2009-02-06 | 2019-07-17 | Mettler-Toledo GmbH | Calibrating device for a power measurement device and power measurement device |
| CN102353438B (en) * | 2011-06-13 | 2013-07-03 | 中国一冶集团有限公司 | Scale calibrating device and scale calibrating method for hopper scale with hopper or hopper bin horizontal detection |
| CN103900643A (en) * | 2014-04-25 | 2014-07-02 | 郑州机械研究所 | Online full-redundancy mass and mass center measurement device based on upper weighing sensor and lower weighing sensor arranged in vertical mirror image mode |
| WO2016074713A1 (en) * | 2014-11-12 | 2016-05-19 | Sandvik Intellectual Property Ab | Modular hopper structure |
| KR101641591B1 (en) | 2014-12-24 | 2016-07-21 | 주식회사 포스코 | Apparatus and method for correcting of weighing hopper |
| ES2689973A1 (en) * | 2017-05-15 | 2018-11-16 | Verificaciones Industriales De Andalucia, S.A. | DEVICE FOR METROLOGICAL VERIFICATION OF INSTRUMENTS OF WEIGHTS OF AUTOMATIC OPERATION OF TYPE TOTALISED DISCONTINUOUS AND PROCEDURE OF OPERATION. (Machine-translation by Google Translate, not legally binding) |
| FR3073286B1 (en) | 2017-11-08 | 2020-04-17 | Centre D'etudes Et De Recherches De L'industrie Du Beton | APPARATUS FOR CALIBRATING INDUSTRIAL WEIGHING EQUIPMENT INCLUDING COUNTERPUSH MEANS AND METHOD FOR CALIBRATION USING SUCH A DEVICE |
| CN110154242B (en) * | 2018-03-29 | 2020-02-18 | 衢州市质量技术监督检测中心 | Load verification method for concrete batching scale |
| CN110307889A (en) * | 2018-09-18 | 2019-10-08 | 梅特勒-托利多(常州)精密仪器有限公司 | Caliberating device for weighing system |
| EP4060297A1 (en) * | 2021-03-18 | 2022-09-21 | Frederik Juul Eilersen | Calibration device for weighing systems |
| KR20240089422A (en) | 2021-10-21 | 2024-06-20 | 에일러센 캘리브레이션 솔루션즈 에이피에스 | Calibration devices for weighing systems |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1542643A (en) | 1976-07-13 | 1979-03-21 | British Steel Corp | Support system for a vessel |
| JPH0629757B2 (en) * | 1983-02-07 | 1994-04-20 | 義則 上堀内 | Hopper scale inspection device |
| GB8924728D0 (en) | 1989-11-02 | 1989-12-20 | Nova Weigh Limited | Calibration of vessel weighing systems |
| DE4133596A1 (en) * | 1991-10-10 | 1993-04-15 | Eirich Maschf Gustav | Arrangement for functional testing of industrial platform or container balance - contains fixed press. cylinder connected to press. source via press. lines contg. control valves, press. regulator |
| DE9403408U1 (en) * | 1994-03-01 | 1994-12-15 | Simon Elektronik GmbH, 71573 Allmersbach | Force measuring device |
-
2003
- 2003-04-04 AT AT0052803A patent/AT413763B/en not_active IP Right Cessation
-
2004
- 2004-02-27 ZA ZA200507233A patent/ZA200507233B/en unknown
- 2004-02-27 UA UAA200510335A patent/UA83829C2/en unknown
- 2004-02-27 BR BRPI0408572-8A patent/BRPI0408572A/en not_active IP Right Cessation
- 2004-02-27 EP EP04715285A patent/EP1639328B1/en not_active Expired - Lifetime
- 2004-02-27 AT AT04715285T patent/ATE340990T1/en active
- 2004-02-27 KR KR1020057018883A patent/KR101107483B1/en not_active IP Right Cessation
- 2004-02-27 DE DE502004001624T patent/DE502004001624D1/en not_active Expired - Lifetime
- 2004-02-27 CN CNB2004800090750A patent/CN100408987C/en not_active Expired - Fee Related
- 2004-02-27 RU RU2005134218/28A patent/RU2328705C2/en not_active IP Right Cessation
- 2004-02-27 WO PCT/EP2004/001996 patent/WO2004088259A1/en active IP Right Grant
- 2004-02-27 PL PL377815A patent/PL213642B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| PL213642B1 (en) | 2013-04-30 |
| EP1639328B1 (en) | 2006-09-27 |
| ATA5282003A (en) | 2005-09-15 |
| ATE340990T1 (en) | 2006-10-15 |
| KR101107483B1 (en) | 2012-01-19 |
| WO2004088259A1 (en) | 2004-10-14 |
| CN100408987C (en) | 2008-08-06 |
| RU2328705C2 (en) | 2008-07-10 |
| BRPI0408572A (en) | 2006-03-21 |
| EP1639328A1 (en) | 2006-03-29 |
| CN1768252A (en) | 2006-05-03 |
| UA83829C2 (en) | 2008-08-26 |
| AT413763B (en) | 2006-05-15 |
| PL377815A1 (en) | 2006-02-20 |
| RU2005134218A (en) | 2006-05-27 |
| DE502004001624D1 (en) | 2006-11-09 |
| KR20050107632A (en) | 2005-11-14 |
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