GB2270570A - A weighing process and belt weigher for carrying out the process - Google Patents
A weighing process and belt weigher for carrying out the process Download PDFInfo
- Publication number
- GB2270570A GB2270570A GB9317244A GB9317244A GB2270570A GB 2270570 A GB2270570 A GB 2270570A GB 9317244 A GB9317244 A GB 9317244A GB 9317244 A GB9317244 A GB 9317244A GB 2270570 A GB2270570 A GB 2270570A
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- GB
- United Kingdom
- Prior art keywords
- belt
- loading
- measured
- weighing
- measuring
- 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.)
- Withdrawn
Links
- 238000005303 weighing Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001419 dependent effect Effects 0.000 claims description 7
- 230000010354 integration Effects 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims description 2
- 101100268676 Burkholderia thailandensis (strain ATCC 700388 / DSM 13276 / CIP 106301 / E264) accA-2 gene Proteins 0.000 claims 1
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 22
- 230000003287 optical effect Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Conveyors (AREA)
- Structure Of Belt Conveyors (AREA)
Abstract
A process for weighing transported amounts has a belt conveyor (1) which comprises, in addition to a weighing part (5), measuring apparatuses (7, 8) which measure belt operation parameters. Preferably, the belt tension and/or the belt speed are measured and are fed to a computer (9). In order to determine an effective belt loading, correction terms which are derived from the values of the belt operation parameters are applied to the value calculated from the weighing signal. <IMAGE>
Description
2270570 WEIGHING PROCESS AND BELT WEIGHER FOR CARRYING OUT THE PROCESS The
invention relates to a process for weighing amounts transported by a conveyor belt, and to a belt wL',igher for carrying out theprocess..
Belt weighers are used in a large number of modern transport and production processes, in particular in the food industry and the chemical industry, for weighing and metering bulk materials.
DE-C 21 02 155 (D1) discloses a conveyor belt weigher having a. weighing part, a drive roller and a guide roller, and a belt tensioning apparatus having an adjustable tensioning force. The actual belt tension is indicated by means of a pointer and an associated scale. Because the weight determined in the weighing part is influenced by the belt tension, a deviation from the desired belt tension leads to an inaccurate weight determination. The instantaneous accuracy of measurement is thus evident from the pointer position.
In the case of a change in the belt tension during operation, recalibration can be effected, if required, by resetting the original belt tension.
An apparatus according to D1 has various disadvantages.
Since changes in the belt tension can occur at any time during operation, a supervisor must continuously check the pointer position and if necessary interrupt the weighing process in order to reset the belt tension.
Resetting is carried out in each case only when a certain tolerance has been exceeded. Furthermore, short-term changes cannot be corrected.in a reasonable manner. It is thus evident that the achievable accuracy of weighing or metering is insufficient for 2 production processes having high requirements with respect to the accuracy of measurement.
According to the prior art, too little attention is paid to the effect of belt operating parameters, such as, for example, belt tension, belt speed, belt acceleration or belt vibrations, on the accuracy of weighing. Consequently, the known belt weighers do not achieve the required accuracy and in particular cannot be used in the case of changing operating conditions.
In D1, it is mentioned that the belt is optionally vertically accelerated during the movement over the measuring roller which serves for determining the bearing load and the inertia forces acting influence the measurement. The vertical acceleration and hence the accuracy of measurement are dependent on a large number of parameters, namely on the belt speed, the belt tension, the vertical position of the measuring roller, the horizontal distance from the measuring roller to the belt support and the flexural properties of the belt. According to the prior art, the belt speed is used only to determine a flow, namely the amount transported over the weighing part per unit time, in conjunction with a belt loading area density determined by the weighing part. The f act that the belt speed, as a disturbance variable, may also have an influence on the measured variable determined by the weighing part is neglected. If the transport speed is altered, the accuracy of measurement also changes.
Apart from the belt operation parameters, the distribution of the material on the conveyor belt also influences the accuracy of the weight determined by means of a belt weigher. This applies especially for 3 large loading differences transverse to the transport direction.
It would be desirable to beable to provide a process and a belt weigher which are suitable for the accurate weighing of transported amounts, even in the case of varying belt operation parameters and in the case of nonuniform belt loading, and permit an extremely accurate determination of weight or amount.
The inventive achievement envisages that, apart from a measured variable essentially dependent on the belt loading of a section of the conveyor, at least one further belt operation parameter influencing the measurement will be measured and will be used for calculating the effective belt load. The suitable operation parameters are all variable parameters of the conveyor belt which, as disturbance variables, influence the weight measurement, but are preferably the belt tension and the belt speed. It should be noted that, according to the prior art, the belt speed is used only as a multiplicative factor for calculating the flow, but not as the disturbance variable for the belt loading measurement.
In the inventive achievement, it is assumed that a belt loading area density is assigned, in accordance with a calibration, to the measured value derived from a belt loading measuring apparatus. Since the measured value used is also influenced by belt operation parameters, the area density determined may deviate from the effective area density. If the operation parameters change, the accuracy of measurement changes. This change in the accuracy of measurement is to be 4 compensated by at least one correction term derived from at least one operation parameter, so that the resulting area density essentially agrees with the effective belt loading area density for any values of at least one operation parameter.
A belt weigher according to the invention permits a weighing process according to the invention and comprises a conveyor belt, a belt support, a drive apparatus, a belt loading measuring apparatus, a belt tensioning apparatus and preferably a belt tension measuring apparatus and/or a belt speed measuring apparatus, as well as a computer to which all measured values are fed. The belt tension is preferably measured between the belt tensioning apparatus and the bearings of a belt guide roller, by at least one pressure sensor. Two pressure sensors, each assigned to a roller bearing, are optionally provided and are connected to the computer so that, in addition to a mean belt tension, a difference between the belt tensions on both sides of the belt can also be determined in the computer.
The belt speed is.determined from the rotational speed of the drive roller or a roller driven by the belt. In order to avoid differences between the determined and the effective belt speed owing to a variable slip between rollers and belt, a speed measurement is optionally carried out directly on the conveyor belt.
For example, an optical apparatus for scanning marks on the lower surface of the belt is suitable for this purpose.
Two different measurement principles are essentially suitable for the belt loading measuring apparatus. The first principle envisages an essentially displacement free pressure-sensing apparatus which preferably measures the bearing load of at least one weighing roller or weighing surface supporting a conveyor belt.
In the region of this'weighing roller or surface, the belt is not borne by the support. In order to ensure an optimal force transmission to the pressuresensing apparatus even in the case of a'nonuniform belt loading transverse to the transport direction, a connecting element which permits lateral deflections of the weighing.. surface but transmits the bearing load vertically to at least one pressure sensor is optionally provided. By the arrangement of several, preferably two, pressure sensors side byside and transverse to the transport direction, a belt loading can be determined in the computer, optionally for sections of the belt. Preferably, however, a mean value is determined only from the values of two pressure sensors and optionally the difference between the individual values is used to determine a correction term.
The second load measuring principle envisages a belt sag measurement in a support-free section of the belt weigher. The measurement is carried out at at least one point by means of at least one torsion element resting against the lower surface of the belt or by at least one non-contact distance measuring means, preferably an optical sensor. If the sag is measured transverse to the transport direction at two or optionally several points, a loading distribution or a mean value can once again be determined.
6 The bearing load as well as the sag depend both on the belt loading and on the belt weight in the region of the measuring point. When the belt loading area density is determined, the term originating from the belt weight is eliminated in the computer and the remaining term is con.erted into a loading area density in accordance with a calibration curve. The calibration curve used must be determined by calibration measurements. It is preferably a straight line, so that the measured belt loading value is included as a linear main term in the determination of the effective belt loading area density.
The loading area density determined from the belt loading measurement deviates from the effective loading is density, owing to the dependence of the measured value on belt operation parameters. To comp ensate for this deviation, a correction term which preferably corresponds to the influence - of the measured belt tension is calculated in the computer from at least one measured belt tension value and is added to the determined loading area density. The one or more measured belt tension values are preferably present in linear form in the correction term. If necessary, it is possible to provide a further correction term which may have a linear dependence on the measured belt speeds but preferably has a Cadratic dependence on said speed and once again is an additive term in the loading area density.
Belt weighers which are intended for use in the case of low and high loading area densities and for bulk material or piece goods optionally have an adjustable measuring roller position and/or variable horizontal 7 distances between the support ends on both sides of the weighing apparatus, so that these values too can be measured and can be used as operation parameteri3 for determining correction terms.
The belt weight carr be regarded as an operation parameter which changes during operation owing to dirt deposits on the upper and/or lower surface of the belt and possibly owing to the friction-related wear. The error due to the change in belt weight is optionally 10 rectified by means of a correction term dependent on the belt weight. Since this change occurs very slowly, the belt weight or its change need not be determined continuously by a measuring apparatus which measures the thickness of the belt. it is suf f icient if the is unladen belt is determined from time to time as a new zero correction and is used as the current input value for a correction term until the next determination. The deformation properties of the belt change essentially with the belt temperature. In order to 20 compensate for the influence of the deformation properties on the weight measurement, the temperature of the belt is therefore preferably measured and the measured temperature value used for generating a correction term. 25 The computer is connected to all measuring apparatuses and continuously calculates the current mean loading area density on the belt section in the weighing region, the particular currerit measured values and calibration values being used for this purpose. A 30 flow, namely the amount conveyed per unit time over the weighing region, is calculated from the mean loading 8 area density, the belt width and the belt speed. if necessary, the amount delivered duringthe integration time is determined by integration of the flow as a function of time. It is also possible to ensure that the computer supports various -calibration procedures and that the calibration values determined are entered in calibration tables and used'when required.
The computer is connected to a control unit which in turn is connected to the belt drive and optionally to a belt tensioning apparatus adjustable by a mechanical or a pneumatic drive and/or to a belt loading apparatus. The control unit is preferably programmable and permits various control functions depending on the flow andlor on the amount delivered and on the belt operation parameters. Thus, the desired f low can be kept within an upper and a lower tolerance limit, for example by control of the belt loading apparatus and optionally of the belt speed, said control being dependent on the difference between a desired flow and the actual flow. When the desired transported amounts are reached, the belt can be switched of f or loading ended. Since the belt tension which is optimal for as accurate a weight measurement as possible is also dependent on the belt loading, it is possible to ensure that the control adapts the belt tension in each case to the measured belt loading.
In order to increase the accuracy of measurement, several belt loading measuring apparatuses can also be provided on a belt weigher.
The advantages achieved by the invention are essentially that a change in the accuracy of 9 measurement is prevented by a change in at least one operation parameter, preferably the belt tension and/or the belt speed, this also being achieved in the case of small and possibly short-term changes. By the continuous adaptation of the determined belt loading by means of correction te2;ms which depend on the operating situation, it is possible, for example, to dispense with stoppages for readjustment of the belt tension, without having to accept inaccuracy of measurement.
The use of a belt weigher having any selectabie belt speed and at the same time an unchanged high accuracy opens up universal applications for this belt weigher.
By way of example only, the invention-will-now be described in greater detail with reference to the is accompanying drawing which is a vertical.section through a belt weigher according to the invention.
A belt weigher 1 according to the Figure essentially comprises a conveyor belt 2, a belt support 3, a drive apparatus 4, a belt loading measuring apparatus 5, a belt tensioning apparatus 6 and preferably a belt tension measuring apparatus 7 and/or a belt speed measuring apparatus 8 and a computer 9. The individual components of the belt weigher are supported by a frame which is attached to a rail 11. The conveyor belt 2 is a continuous belt, preferably a steel belt. The support 3 consists of individual support arms or support rollers or optionally support surfaces, on which the conveyor belt rests at predetermined distances on both sides of the loading measuring apparatus 5.
The drive apparatus 4 essentially consists of a drive roller 12 and a drive, preferably an electric motor. A drive line 13 which connects the drive to a control unit 14 is provided for controlling the drive.
The loading measurind apparatus 5 preferably consists of a weighing roller 15, which is mounted on both sides in a base 16, and of a weighing pressure sensor 17 which is arranged between the base 16 and the frame 10.
The weighing roller 15 can be arranged in such a way that it projects slightly beyond the support 3 and thus produces- slight initial tension in the belt.
Preferably, however, it projects only slightly, if at all, so that tiie tensioned belt 2 runs essentially flat over the support 3 and the weighing roller 15. An adjusting apparatus is optionally provided so that the weighing roller 15 can be moved vertically to a desired point. The sensitivity of the belt weigher depends both on the sensitivity of the weighing pressure sensor 17 and o n the position of the weighing roller 15 and the belt tension. The value determined by the weighing pressure sensor 17 is fed via a pressure signal line 18 to the computer 9.
The belt tensioning apparatus consists of at least one rod 20, which is displaceably guided in orifices 21 of the frame 10, and of at least one spring element 19 surrounding the rod 20. The spring element rests against the frame 10 and presses against a nut 22 which is adjustable on the rod 20. 'That end of the rod 20 which is adjacent to the nut 22 is connected to a tensioning roller holder 23 via at least one pressure sensor 7 for the tension. The holder 23 is displaceably guided in the transport direction on the 11 frame. 10 and comprises pivot bearing 24 for a tensioning roller 25. A tension signal line 26 leads from the pressure sensor 7 for the tension to the computer 9.
For measurement of thh belt speed, an optical sensor 8 is preferably provided which scans marks on the inside of the belt and transmits to the computer 9, via a speed signal line 27, signals from which the belt speed can be determined. The belt speed is optionally 10 determined from the rotary speed of the drive roller or of a roller driven by the belt. The control unit 14 is connected to the computer 9 in such a way that information and values can be transmitted in both directions. in addition to the 15 control of the belt speed via the drive line 13, the control unit can optionally regulate the belt loading by a loading apparatus 29 via a control line 28.
12
Claims (13)
1. Process for weighing amounts transported by a conveyor belt, in which process, in addition to a measured belt loading variable essentially dependent on the belt loading of a'section of the conveyor, at least one further belt operation parameter influencing this measured variable is also measured, characterised in that both the measured belt loading variable and at least one further measured belt operation parameter are used for determining the effective belt loading area density.
2. Process according to Claim 1, characterised in that the belt tension andlor the]Selt speed are intended as belt operation parameters.
is
3. Process according to Claim 1 or 2, characterised in that a flow, namely the amount transported over the loading measuring point per unit time, is determined from the effective belt loading area density, the belt width and the belt speed, and optionally the transported amount during the integration time is determined by integration of the flow as a function of time.
4. Process according to Claim 3, characterised in that the flow and/or the amount transported are used for controlling the belt speed and/or the belt loading.
5. Belt weigher for carrying out the process according to any of the preceding Claims, having a conveyor belt, a drive apparatus, a belt tensioning apparatus, a belt loading measuring apparatus for 13 determining a measured belt loading variable essentially dependent on the belt loading of a section of the belt weigher and at least one further measuring apparatus for measuring a belt operation parameter which influences the measured belt loading variable, characterised in thaC a computer is provided, to which the measured values of the belt loading measuring apparatus and of at least one measuring apparatus for belt operation parameters can be fed.
6. Apparatus according to Claim 5, characterised in that. a belt tensioning measuring apparatus and/or a belt speed measuring apparatus are provided as measuring apparatus for belt operation parameters.
is
7. Apparatus according to either of Claims 5 or 6, characterised in that a value proportional to the measured value is fed to the computer from the belt tension measuring apparatus as a first approximation in the form of an additive linear correction term for calculating the effective belt area density.
8. Apparatus according to any of Claims 5 to 7, characterised in that a measured valuewhich serves to a first approximation as an additive linear, preferably quadratic, correction term. f or calculating the effective belt loading area density is fed to the computer from the belt speed measuring apparatus
9. Apparatus according to any of Claims 5 to 8, characterised in that the belt loading measuring 14 apparatus comprises (a) an essentially displacement-free pressure-sensing apparatus which preferably measured' the bearing load of at least one weighing roller or weighing surface supporting the conveyor belt or (b) a belt sag measuring apparatus which measures the belt sag at at least one point on a support-free section of the belt weigher. preferably by means of at least one torsion element resting against the lower surf ace of the belt or by at least one non-contact distance-measuring means, and feeds the computer a value which, after elimination of the component due to the belt weight, preferably serves as a linear term in the determination of the effective belt loading area density.
10. Apparatus according to Claim 9., characterised in that pressure-sensing elements andlor belt sag sensors arranged side by side transverse to the transport direction are provided, the measured values of which can be fed to the computer so that a mean belt loading can be determined.
11. Apparatus according to any of Claims 5 to 10, characterised in that a control unit which can be connected to the computer t o the belt drive and to the belt loading apparatus is provided.
12. Process for weighing amounts transported by a conveyor belt substantially as described with reference to the accompanying drawing.
13. A belt weigher substantially as described with reference to and as illustrated by the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19924230368 DE4230368A1 (en) | 1992-09-11 | 1992-09-11 | Weighing method and belt scale therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9317244D0 GB9317244D0 (en) | 1993-10-06 |
| GB2270570A true GB2270570A (en) | 1994-03-16 |
Family
ID=6467711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9317244A Withdrawn GB2270570A (en) | 1992-09-11 | 1993-08-19 | A weighing process and belt weigher for carrying out the process |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE4230368A1 (en) |
| GB (1) | GB2270570A (en) |
| SE (1) | SE9302938L (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2349859A (en) * | 1999-05-14 | 2000-11-15 | Frisse Richard Maschf | Metallic conveyor belt arrangement |
| WO2009065524A1 (en) * | 2007-11-20 | 2009-05-28 | Schenck Process Gmbh | Metering conveyor |
| CN101532872B (en) * | 2009-04-22 | 2010-12-29 | 江苏赛摩集团有限公司 | Weighing controlling device and method of electronic belt scale |
| CN103765173A (en) * | 2011-08-24 | 2014-04-30 | 申克公司 | Self-calibrating dosing device |
| CN114396995A (en) * | 2022-01-14 | 2022-04-26 | 赛摩电气有限公司 | Weighing device and metering method of belt feeder |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19829036A1 (en) * | 1998-06-30 | 2000-01-05 | Pfister Gmbh | Chain conveyor |
| DE19951646A1 (en) * | 1999-10-27 | 2001-05-23 | Wirtgen Gmbh | Construction machine |
| DE10130022A1 (en) * | 2001-06-25 | 2003-01-02 | Pfister Gmbh | Chain conveyor in the form of scales |
| CN103900674A (en) * | 2012-12-28 | 2014-07-02 | 山东中烟工业有限责任公司青岛卷烟厂 | Accuracy judging method of weighing system composed of multiple electronic belt scales |
| DE102016208305A1 (en) * | 2016-05-13 | 2017-11-16 | Popp Maschinenbau Gmbh | Conveyor line with a vibrated conveyor belt |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1481832A (en) * | 1973-08-20 | 1977-08-03 | Mcdonald R | Conveyors |
| GB1497925A (en) * | 1974-03-08 | 1978-01-12 | Rieter Ag Maschf | Weighing apparatus for continuously weighing a layer of fibre material |
| SU670820A1 (en) * | 1975-12-24 | 1979-06-30 | Научно-Исследовательский И Конструкторский Институт Испытательных Машин, Приборов И Средств Измерения Масс | Weight-measuring apparatus |
| SU779815A1 (en) * | 1978-11-09 | 1980-11-15 | Криворожский Ордена Трудового Красного Знамени Горнорудный Институт | Method of continuous measuring of the load per meter of belt conveyer |
| SU956998A2 (en) * | 1980-07-09 | 1982-09-07 | Карагандинский Ордена Трудового Красного Знамени Политехнический Институт (Кпти) | Weight measuring device |
| SU1451553A1 (en) * | 1987-03-31 | 1989-01-15 | Московское научно-производственное объединение "Измеритель" | Belt-conveyer weigher |
| SU1451554A1 (en) * | 1987-03-31 | 1989-01-15 | Московское научно-производственное объединение "Измеритель" | Belt-conveyer weigher |
-
1992
- 1992-09-11 DE DE19924230368 patent/DE4230368A1/en not_active Withdrawn
-
1993
- 1993-08-19 GB GB9317244A patent/GB2270570A/en not_active Withdrawn
- 1993-09-10 SE SE9302938A patent/SE9302938L/en not_active Application Discontinuation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1481832A (en) * | 1973-08-20 | 1977-08-03 | Mcdonald R | Conveyors |
| GB1497925A (en) * | 1974-03-08 | 1978-01-12 | Rieter Ag Maschf | Weighing apparatus for continuously weighing a layer of fibre material |
| SU670820A1 (en) * | 1975-12-24 | 1979-06-30 | Научно-Исследовательский И Конструкторский Институт Испытательных Машин, Приборов И Средств Измерения Масс | Weight-measuring apparatus |
| SU779815A1 (en) * | 1978-11-09 | 1980-11-15 | Криворожский Ордена Трудового Красного Знамени Горнорудный Институт | Method of continuous measuring of the load per meter of belt conveyer |
| SU956998A2 (en) * | 1980-07-09 | 1982-09-07 | Карагандинский Ордена Трудового Красного Знамени Политехнический Институт (Кпти) | Weight measuring device |
| SU1451553A1 (en) * | 1987-03-31 | 1989-01-15 | Московское научно-производственное объединение "Измеритель" | Belt-conveyer weigher |
| SU1451554A1 (en) * | 1987-03-31 | 1989-01-15 | Московское научно-производственное объединение "Измеритель" | Belt-conveyer weigher |
Non-Patent Citations (2)
| Title |
|---|
| WPI Abstract Accession No 89-307956/42 & SU1451553A (MOSC IZMERITAL)(see abstract) * |
| WPI Abstract Accession No 89-307957/42 & SU1451554A (MOSC IZMERITAL)(see abstract) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2349859A (en) * | 1999-05-14 | 2000-11-15 | Frisse Richard Maschf | Metallic conveyor belt arrangement |
| GB2349859B (en) * | 1999-05-14 | 2003-01-29 | Frisse Richard Maschf | Metallic conveyor belt arrangement |
| WO2009065524A1 (en) * | 2007-11-20 | 2009-05-28 | Schenck Process Gmbh | Metering conveyor |
| CN102216742A (en) * | 2007-11-20 | 2011-10-12 | 申克公司 | Metering conveyor |
| CN102216742B (en) * | 2007-11-20 | 2013-04-03 | 申克公司 | Metering conveyor |
| CN101532872B (en) * | 2009-04-22 | 2010-12-29 | 江苏赛摩集团有限公司 | Weighing controlling device and method of electronic belt scale |
| CN103765173A (en) * | 2011-08-24 | 2014-04-30 | 申克公司 | Self-calibrating dosing device |
| CN103765173B (en) * | 2011-08-24 | 2016-03-09 | 申克公司 | Self-calibration weigh feeder |
| CN114396995A (en) * | 2022-01-14 | 2022-04-26 | 赛摩电气有限公司 | Weighing device and metering method of belt feeder |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4230368A1 (en) | 1994-03-17 |
| SE9302938D0 (en) | 1993-09-10 |
| SE9302938L (en) | 1994-03-12 |
| GB9317244D0 (en) | 1993-10-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |