EP1254351A1 - Debitmetre massique pour matieres solides en poudre et en granules et masse accumulee - Google Patents

Debitmetre massique pour matieres solides en poudre et en granules et masse accumulee

Info

Publication number
EP1254351A1
EP1254351A1 EP00992903A EP00992903A EP1254351A1 EP 1254351 A1 EP1254351 A1 EP 1254351A1 EP 00992903 A EP00992903 A EP 00992903A EP 00992903 A EP00992903 A EP 00992903A EP 1254351 A1 EP1254351 A1 EP 1254351A1
Authority
EP
European Patent Office
Prior art keywords
flow rate
mass flow
calibration
process material
output signal
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Withdrawn
Application number
EP00992903A
Other languages
German (de)
English (en)
Other versions
EP1254351A4 (fr
Inventor
Hugo Gabriel Martina
Guillermo Alfredo Martina
Drewfus Young Myers Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from US09/476,008 external-priority patent/US6367336B1/en
Application filed by Individual filed Critical Individual
Publication of EP1254351A1 publication Critical patent/EP1254351A1/fr
Publication of EP1254351A4 publication Critical patent/EP1254351A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
    • G01F1/30—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter for fluent solid material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G01F25/13—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a reference counter

Definitions

  • the present invention relates to a flow meter and more particularly to a process gravity free fall flow meter for measuring the flow rate and accumulated weight of solid powdered, particulate or granulated materials or other solids of like nature such as seeds, grains and pellets passing through a measuring chamber.
  • a Coriolis flow meter is a mass flow meter that measures the mass flow rate of material flowing in a flow tube supported at both ends by oscillating the flow tube and detecting a Coriolis force acting on the flow tube, said measured force being theoretically proportional to the mass flow rate of the material.
  • the Coriolis force is detected as a difference of phases produced at symmetrical positions between the supporting points and the center portion of the flow tube when the flow tube is driven alternately at its center portion in a direction perpendicular to the supporting axis.
  • the flow tube is electromechanically vibrated out-of-phase with respect to a balance tube which is provided to reduce the vibrations that would be associated with a single unbalanced flow tube.
  • These vibrations impart a Coriolis acceleration to material flowing through the flow tube.
  • the reaction force to this Coriolis acceleration results in a slight distortion of the vibration mode shape of the flow tube.
  • This distortion is measured by sensors connected to, or associated with, the flow tube.
  • the sensors may be either of the velocity or displacement type.
  • the material flow rate is proportional to the time or phase delay between the signals generated by two such sensors positioned along the length of the straight flow tube. A single sensor may also be used.
  • Output signals of the sensors are applied to electronic apparatus which derives the desired information, such as mass flow rate, for the material in the flow tube.
  • the impact flow meter is widely employed in industry due to its potential robustness and ease of insertion into flow systems.
  • the systems are based on the measurement of one component (usually horizontal) of the force of impact imparted by the flowing material as it falls on an impact plate positioned in the general line of flow of the material of interest.
  • the impact of the flowing material on the impact plate produces a minimal movement or distortion in the position of the plate.
  • a sensor, force transducer or other mechanism transfers the limited movement or distortion of the impact plate to the appropriate sensing device and related electronic circuitry which then converts that signal to an instantaneous mass flow rate based on suitable calibration data.
  • the type of momentum transmission involved is essential - the degree of force transmitted is greater in the case of elastic impact than with inelastic impact.
  • the specific impact rate, which must be taken into consideration, also varies with the type of bulk material involved and the condition of the bulk material at a given moment. The units described generally provide satisfactory results with respect to the bulk material to be weighed only through extensive calibration and generally require frequent control of such calibration.
  • Electronic load cells devices are also common in industry due to their theoretical precision and adaptability to transport belts and related systems as well as direct static weighing.
  • Electronic load cells devices are found to be extremely sensitive to physical abuse, requiring frequent calibration and control to maintain accuracy and precision. In addition, they are relatively delicate and easily broken by misuse. Their accuracy is also dependent on their proper installation so that any dislocation or movement in their location can produce significant errors in the final result.
  • Turbine flow meter devices have found great application in the measurement of fluid flows, especially in pressurized gas flow measurements and in simple pumped liquids such as is found in gasoline pumps. In such applications, however, the fluid flow is generally relatively constant and there exists a natural resistance in the flow field that prevents any "free wheeling" of the measuring turbine when the force of the flowing material changes. In free flowing systems such as those contemplated by the present invention, turbine flow meters are rare and those in existence must incorporate some braking mechanism to prevent "free wheeling" of the turbine, since free fall systems will not have the natural braking mechanism present in a pumped fluid system.
  • Such braking mechanisms routinely involve some mechanical and/or electromagnetic phenomenon that requires continual or periodic monitoring of the applied braking force to insure constancy of its action so as not to over compensate and thereby alter the resultant forces and introduce measurement errors, or to detect and compensate for variations in braking force due to wear, fatigue or changes in characteristics due to changes in temperature or other ambient conditions.
  • a process mass flow apparatus for measuring the mass flow rate of a powdered, granulated or otherwise substantially divided process solids, seeds, grains, or similar particulate materials
  • a process material inlet for measuring the mass flow rate of a powdered, granulated or otherwise substantially divided process solids, seeds, grains, or similar particulate materials
  • a process material outlet for measuring the mass flow rate of a powdered, granulated or otherwise substantially divided process solids, seeds, grains, or similar particulate materials
  • a process material flow sensor located in the measuring chamber which provides a raw output signal corresponding to an unknown mass flow rate
  • a signal processor, computer, programmed logic controller (pic) or other device of a similar function known to the art which contains an empirically derived conversion function for converting the raw output signal to an adjusted signal indicating the mass flow rate of the process material.
  • An additional object of the invention is to provide a method for determining an unknown mass flow rate using an empirically derived conversion function, the function being derived by correlating the raw output signal of a mass flow apparatus sensing the flow of a calibration material with the output signal of the mass flow instrument sensing the flow of the process material and a method for calculating the accumulated weight of material having passed through the measuring chamber during a period of time specified by the user.
  • the exemplary mass flow instrument may further include a flow control portion, which may comprise a control unit, a valve drive, a valve, or other control or warning device known in the art that responds to an electronic, visual, audio, or other signal form produced by said control unit as a result of the process of determining the flow rate and/or accumulated weight of process material passing through or having passed through the measuring chamber.
  • a flow control portion which may comprise a control unit, a valve drive, a valve, or other control or warning device known in the art that responds to an electronic, visual, audio, or other signal form produced by said control unit as a result of the process of determining the flow rate and/or accumulated weight of process material passing through or having passed through the measuring chamber.
  • a method for determining an unknown mass flow rate of a process material flowing through a process mass flow apparatus comprises the acts of providing one or more calibration materials which may or may not the same as the process material and providing a mass flow apparatus similar to the process mass flow apparatus which is used for calibration purposes.
  • the calibration mass flow apparatus is calibrated using the calibration material or materials by allowing said calibration material or materials to flow through the calibration mass flow apparatus at various known mass flow rates and correlating the raw output signal with the corresponding .known flow rate and subsequently deriving a flow rate conversion function by applications of mathematical regression analysis using procedures or computer programs well known in the art.
  • the conversion function may be a linear, quadratic, or cubic polynomial function or other mathematical function suitable for the specific application. Included in the conversion function is a multiplication factor or final calibration factor that allows the user to fine-tune the calibration to adjust for any small differences in the characteristics between the process mass flow meter and the calibration mass flow meter.
  • the calibration function is programmed into the control unit of the process mass flow meter. Once the process mass flow meter is installed in its final position, a final calibration is carried out by passing process material through the mass flow apparatus at a known flow rate.
  • Another object of the present invention is to provide a means by which the user can carry out in a continuous way a control of the flow rate- and accumulated weight of a granulated, powdered or other particulate material as it passes through the zone of measurement in a way that produces an appropriate signal allowing the calculation of flow rate and/or accumulated weight of material passed as well as offering the possibility of providing a signal that may subsequently be employed in the control of one or more related processes such as process feed, valves, motors, etc.
  • the fact that the user can pass materials as diverse as grains, seeds, pellets, powders, etc., in a continuous way makes much more efficient diverse processes such as loading, transport, transfer, packaging, and the like.
  • the present invention provides the ability to measure and control flow rates and accumulated weights of materials in fixed lines of transport, in dosing operations, for fiscal control operations, and in situations requiring portable operation all with a simple, easy to use apparatus.
  • the apparatus of the invention has a measuring chamber having a body comprising a flow tube or conduit having a rectangular, circular, elliptical, or other cross section through which the solid material to be measured is directed.
  • a movable element with a fixed axis of rotation on which the passing solid material exercises a force or torque proportional to the mass flow rate of the solid material and acting against a constant restoring force applied to the axis or the movable lever device, said restoring force being such that the degree of rotational or linear movement imparted by the passing solid will be a function of the force imparted by the solid material due to gravitational forces in free fall or to momentum imparted to said process material by some mechanical means of material transport.
  • Attached to the axis of the movable lever assembly or to some other convenient part of said assembly is a digital or analog device that measures the angle of rotation of said movable element or some proportional value of the linear movement of said assembly.
  • the raw signal from the digital or analog measuring device is passed to an appropriate electronic circuit that conditions the raw signal in a manner such that a properly programmed associated microprocessor, computer, programmable logic controller (pic) or other similar device receiving said signal converts said signal to an instantaneous flow rate based on a preprogrammed calibration function or table.
  • An additional step in the program then employs an internal clock or other suitable device or method and the previously calculated instantaneous flow rate for calculating the accumulated weight of material having passed through the measuring chamber during the measuring process. If so desired, the raw signal and/or calculated flow rate or accumulated weight can be employed as a feedback signal for the control of appropriate valves, motors or other control devices as are well known in the art.
  • a particularly important embodiment of the invention is its applicability as a portable device for measuring and controlling the amount of solid material being extracted from or loaded into tanks, trucks, rail cars, ships or other containers or transport systems in a continuous manner, providing important information related to the rate of material transfer, partial weights of material transferred, and final total weights transferred from or to the point of interest to the user.
  • an important embodiment of the present invention is its application in mobile field operations such as, for example, the loading of seeds, grains, or other bulk materials into trucks, rail cars, silos, etc., at the time of harvest, storage, or production.
  • a second important embodiment of the invention is its use in fixed process lines for which its compact design and potential for structural modification and custom design make it a particularly attractive alternative to similar products known in the art.
  • the invention described is notable for its ease of use and flexibility of installation, requiring no more than correct leveling and a simple in-place calibration process. Other factors related to the installation of the invention vary according to the place and form of use.
  • FIG. 1 shows a schematic representation of one embodiment (fixed installation) of a mass flow apparatus in accordance with the present invention
  • FIG. 2 shows a schematic representation of a second embodiment (mobile installation) of a mass flow apparatus in accordance with the present invention
  • FIG. 3 shows a force diagram of the various force couples and torques involved in the function of the present invention
  • FIG. 4 shows schematic front and side views of the basic construction of one embodiment of the mass flow apparatus
  • FIG. 5 shows schematic representations of several preferred mechanisms for producing restitution of the movable lever assembly
  • FIG. 6 shows a flow chart illustrating the process of creating a calibration function for the mass flow apparatus of the present invention using a standard calibration material
  • FIG. 7 shows a flow chart illustrating the process of determining the final process calibration factor, K, using the actual process material.
  • FIG. 1 illustrates one preferred embodiment of the present invention in which the process flow apparatus 10 is installed in a fixed line of production in which the process material to be measured or controlled passes from a storage or feed hopper 11 through one or more valves, control, or transport mechanisms 12 into said flow apparatus 10, passing through the measuring chamber and producing the raw signal that is sent to the control unit 13 where the raw signal is converted to a mass flow rate by the pre-programmed calibration function, after which the calculated flow rate and or accumulated weight of process material passed is displayed, or the relevant data sent to an attached data processing or display station 14 (for example, a data recorder, a data transmitter, a central data processing station, etc.). If so desired, the calculated flow rate or accumulated weight may be used, employing electronic means well known in the art, for the control of associated valves 12, motors, actuators, control units, etc, 15 for controlling the overall process.
  • an attached data processing or display station 14 for example, a data recorder, a data transmitter, a central data processing station, etc.
  • the apparatus of the present invention may be employed in a mobile process operation such as that shown schematically in FIG. 2 in which the flow apparatus 10 subject of the present invention is located in series with a process material transport system, such as, for example, a screw auger 17 used in the transport of seed or grain from a harvester 18 to a transport 19 such as a truck, rail car, cargo ship, etc.
  • a process material transport system such as, for example, a screw auger 17 used in the transport of seed or grain from a harvester 18 to a transport 19 such as a truck, rail car, cargo ship, etc.
  • the function of the ' present invention is based on the following physical principle: as the granulated or powdered material enters the measuring zone or chamber it exerts a force on a movable element that varies its position in response to the force applied to it by the flowing material.
  • Said positional variation may be represented as a change in the angle of the movable element relative to a fixed axis position, the change in the linear distance between a fixed point and a point on the movable element, or some similar measurable modification of position, so long as such change can be quantitatively related to the flow rate of material causing the positional change through the application of a calibration function.
  • FIG. 3 A schematic representation of the forces acting on the movable element according to one embodiment of the invention is given in FIG. 3, where the movable element 20 is attached to an axis of rotation 21 to which is attached a sensor 22 that detects the movement of said movable element and emits a raw signal that is proportional to the degree of rotation of the movable element under the action of the flowing material, or, as an alternative, the linear distance of said movement relative to some fixed point of reference.
  • the movable element In the case that the flow rate is variable, the movable element must respond and vary its position in direct and rapid response to such a change in flow so that the device includes an element or mechanism 23 attached to the movable element or its axis of rotation that will apply a restoring force causing the movable element to return toward its original position as the force of the flowing material is decreased or to its "zero" point in the absence of an incident force.
  • m is the mass of the process material traversing the measuring chamber and a is the acceleration of said process material at the moment of contact with the movable element of the present invention.
  • the acceleration, a will be equal to the acceleration due to gravity or some component of said acceleration, depending on the exact configuration of the process material inlet and the movable element.
  • the material passing through the apparatus will exercise a force, F, on the movable element, such force producing a moment with respect to the rotational axis of the movable element in such a way that the angle subtended by the movable element or, alternatively, its radial or linear distance of movement with respect to a fixed point of reference, will vary directly with F.
  • F force
  • the force, F is acting on the movable element
  • the element or elements fixed to or communicated with the movable element or its axis of rotation will exercise a restoring force, F R , in the opposite direction or sense of rotation.
  • D is the distance between the effective average point of contact of the passing material with the movable element at which the incident force is applied and its axis of rotation
  • d is the distance between the effective point of application of the restoring force, F R , and the axis of rotation of the mobile element
  • ⁇ is the angle of rotation of the mobile element produced by the force applied by the passing material
  • F x D F R x d
  • (F x D) is the force couple or torque produced by the passing process material on the movable element
  • (F R x d) is the restoring force exercised by the element or elements of restitution acting on the movable element. Any variation in F will produce a proportional variation in the force couple (F x D) resulting in a .new equilibrium position of the movable element.
  • the basic elements of construction of a preferred embodiment of the present invention are shown schematically in FIG. 4.
  • the preferred embodiment comprises a process material entrance 24 leading to the measuring chamber 25 in which is located the movable element 20 attached to an axis of rotation 21, and a process material exit 27.
  • the sensor 22 producing the raw signal reflecting the displacement of the movable element may be attached directly to the axis of rotation, as illustrated, or may be attached to other convenient points.
  • the sensor 22 may be a digital or analog device that produces a raw signal proportional to the degree of radial or linear movement of the movable element under the influence of the flowing process material. In a preferred embodiment, said sensor would be a digital encoder, although other options will be obvious to those practiced in the art.
  • the element or elements providing the restoring force 23 can be, for example, a spring, a counter-weight system, a system of permanent magnets or electromagnets, pneumatic or hydraulic systems, hysterisis clutches or brakes, or similar methods.
  • a spring for example, a spring, a counter-weight system, a system of permanent magnets or electromagnets, pneumatic or hydraulic systems, hysterisis clutches or brakes, or similar methods.
  • Typical, but not limiting, examples of restoration mechanisms are illustrated in FIG. 5A-E.
  • Figure 5A shows an embodiment wherein a magnetic arrangement acts as restoring force element 23 for generating an opposing force to return member 20 to a rest position.
  • FIGS 5B-E show further alternatives for element 23 which are believed to be clear from the illustrations. Of course, numerous other configurations are available.
  • the user can obtain a readout of the instantaneous flow rate and, if desired, the accumulated weight of material having passed through the measuring zone in a given lapsed time.
  • the method provided comprises the acts of providing one or more calibration materials which may or may not be the same as the process material, and providing a mass flow apparatus similar to the process mass flow apparatus which is used for calibration purposes. Alternatively, the method may be employed with the actual apparatus to be used in the process.
  • the calibration mass flow apparatus is calibrated using the calibration material or materials by allowing said calibration material or materials to flow through the calibration mass flow apparatus at various known mass flow rates, recording or registering the value of the raw signal output of the sensor at each known flow rate, correlating the raw output signal with the corresponding known flow rate, and subsequently deriving a flow rate conversion function by application of mathematical regression analysis using procedures or computer programs well known in the art.
  • the conversion function may be a linear, quadratic, or cubic polynomial function or other mathematical function suitable for the specific application.
  • K a multiplication factor or final calibration factor, that allows the user to fine-tune or finalize the calibration function to adjust for any small differences in the characteristics between the process mass flow meter and the calibration mass flow meter, or for small differences in the characteristics of the process material relative to the calibration material.
  • FIG. 7 An illustrative diagram for the determination of the final calibration factor, K, is given in FIG. 7.
  • the calibration function is determined it is programmed into the control unit of the process mass flow meter.
  • a final calibration is carried out by passing process material through the mass flow apparatus at a known flow rate.
  • the ratio between the known flow rate of process material F2, and that indicated by the preliminary calibration, FI, K is then employed as the final calibration factor which is entered into the control unit program by the user to complete the calibration process.
  • Q is the flow rate of process or calibration material passing through the measuring chamber at the instant of signal conversion
  • K is the previously defined final process calibration factor
  • S is the value of the raw signal produced by the material flow passing through the measuring chamber
  • A, B, C, and D are the derived coefficients for a polynomial regression best fit curve to the calibration data.
  • the units of flow (kilograms/sec, pounds/minute, tons/hour, etc.) calculated by the calibration function can be determined at the time of calibration or several options can be provided by the use of standard conversion factors programmed in the controlling unit selectable by the user.
  • Another object of the present invention is to provide a means by which the user can carry out in a continuous way a control of the flow rate and accumulated weight of a granulated, powdered or other particulate material as it passes through the measurement chamber in a way that produces an appropriate signal allowing the calculation of flow rate and/or accumulated weight of material passed as well as offering the possibility of providing a signal that may subsequently be employed in the control of one or more related processes such as process feed pumps, valves, motors, alarms, etc.
  • the fact that the user can pass materials as diverse as grains, seeds, pellets, powders, etc., in a continuous way makes much more efficient diverse processes such as loading, transport, transfer, packaging, and the like.
  • the present invention provides the ability to measure and control flow rates and accumulated weights of materials in fixed lines of transport, in dosing operations, for fiscal control operations, and in situations requiring portable operation all with a simple, easy to use apparatus .

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre massique permettant de mesurer le débit massique de matières solides en poudre, en granulés ou particulaires, lequel appareil comprend un orifice d'entrée (24) de la matière, un orifice de sortie (27) de la matière, une chambre (25) de mesure, qui relie l'orifice d'entrée à l'orifice de sortie, et qui comporte un élément mobile (20) à axe de rotation fixe disposé dans le chemin d'écoulement, axe de rotation au niveau duquel sont fixés un capteur (22) d'écoulement qui fournit un signal de sortie brut correspondant à un débit massique inconnu et un processeur pourvu d'une fonction d'étalonnage, établie de façon empirique, servant à convertir le signal de sortie brut en un signal ajusté indiquant le débit massique corrigé de matière écoulée.
EP00992903A 1999-12-29 2000-12-12 Debitmetre massique pour matieres solides en poudre et en granules et masse accumulee Withdrawn EP1254351A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US476008 1999-12-29
US09/476,008 US6367336B1 (en) 1998-12-29 1999-12-29 Process mass flow apparatus and method for measuring the mass flow of powdered and granulated solids as well as the accumulated weight of material passed during a specified time
PCT/US2000/042755 WO2001048442A1 (fr) 1999-12-29 2000-12-12 Debitmetre massique pour matieres solides en poudre et en granules et masse accumulee

Publications (2)

Publication Number Publication Date
EP1254351A1 true EP1254351A1 (fr) 2002-11-06
EP1254351A4 EP1254351A4 (fr) 2006-07-05

Family

ID=23890116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00992903A Withdrawn EP1254351A4 (fr) 1999-12-29 2000-12-12 Debitmetre massique pour matieres solides en poudre et en granules et masse accumulee

Country Status (3)

Country Link
EP (1) EP1254351A4 (fr)
AU (1) AU4716501A (fr)
WO (1) WO2001048442A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101806604B (zh) * 2010-04-15 2012-08-15 孙家鼎 粉料精测装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159840A (en) * 1989-02-20 1992-11-03 Truzschler GmbH & Co. KG Method and apparatus for measuring, regulating and controlling the quantity of fiber tufts in flight
US5257530A (en) * 1991-11-05 1993-11-02 Atlantic Richfield Company Acoustic sand detector for fluid flowstreams
EP0853234A1 (fr) * 1997-01-11 1998-07-15 New Holland Belgium N.V. Améliorations liées aux et concernant des surfaces
EP0856723A2 (fr) * 1997-01-14 1998-08-05 New Holland Belgium N.V. Améliorations liées a ou concercant une mesure du débit massique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774446A (en) * 1972-10-19 1973-11-27 Hayes R System for measurement of volume of flow of a flowable granular-like material
US4277022A (en) * 1977-04-19 1981-07-07 Dennis W. Holdsworth Mobile material distribution system
US4344747A (en) * 1978-12-29 1982-08-17 Owens-Corning Fiberglas Corporation Sensing apparatus for pelletizing process
US5343761A (en) * 1991-06-17 1994-09-06 Allen Myers Method and apparatus for measuring grain mass flow rate in harvesters
US5798466A (en) * 1996-01-26 1998-08-25 Satake Corporation Flow meter and method of calibrating same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159840A (en) * 1989-02-20 1992-11-03 Truzschler GmbH & Co. KG Method and apparatus for measuring, regulating and controlling the quantity of fiber tufts in flight
US5257530A (en) * 1991-11-05 1993-11-02 Atlantic Richfield Company Acoustic sand detector for fluid flowstreams
EP0853234A1 (fr) * 1997-01-11 1998-07-15 New Holland Belgium N.V. Améliorations liées aux et concernant des surfaces
EP0856723A2 (fr) * 1997-01-14 1998-08-05 New Holland Belgium N.V. Améliorations liées a ou concercant une mesure du débit massique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0148442A1 *

Also Published As

Publication number Publication date
WO2001048442A1 (fr) 2001-07-05
EP1254351A4 (fr) 2006-07-05
AU4716501A (en) 2001-07-09

Similar Documents

Publication Publication Date Title
US6367336B1 (en) Process mass flow apparatus and method for measuring the mass flow of powdered and granulated solids as well as the accumulated weight of material passed during a specified time
JP2602820B2 (ja) 流動性材料用連続的重量測定スケール
US5121638A (en) Method and device for recording the flow rate of a stream of bulk material
JP2984059B2 (ja) 予め定めた充填量のばら物を袋詰めするための方法およびばら物袋詰め装置
US4945957A (en) High-resolution weigher/feeder for fine particulate materials
US20070215391A1 (en) Conveyor belt scale system
US20080302169A1 (en) Method for detecting corrosion, erosion or product buildup on vibrating element densitometers and coriolis flowmeters and calibration validation
US5970802A (en) Relating to mass flow measuring apparatuses
CN100348955C (zh) 用于连续重力测量地计量的装置
USRE29944E (en) Conveyor belt system with positional transformation of weight data
US3960225A (en) Conveyor belt system with positional transformation of weight data
WO2001048442A1 (fr) Debitmetre massique pour matieres solides en poudre et en granules et masse accumulee
KR20170136626A (ko) 진동계에 의한 부정확한 유량 측정을 검출하는 방법
CA2322375C (fr) Methode de compensation de releves errones pour debitmetres massiques
US4480705A (en) Platform calibration factor for conveyor inclination angle
JPH03134520A (ja) バルク製品の輸送量の測定方法および装置
GB2040479A (en) Weighing Device
Siev et al. Solids flowmeters and feeders
JPH0428030Y2 (fr)
JP2651416B2 (ja) 粉粒体の流量計測装置
JP2717576B2 (ja) コンベヤ式流量計
JP2627943B2 (ja) 粉粒体の流量計測方法および装置
RU2036440C1 (ru) Устройство для измерения массы нетто
WO2003100354A2 (fr) Debitmetre massique a integration de forces d'acceleration dans un tube et systeme utilisant le debitmetre massique
JPH0543408B2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20020729

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

A4 Supplementary search report drawn up and despatched

Effective date: 20060602

17Q First examination report despatched

Effective date: 20061017

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20090701