EP0452332A1 - Dispositif de pesee et de dosage pour substances coulantes - Google Patents

Dispositif de pesee et de dosage pour substances coulantes

Info

Publication number
EP0452332A1
EP0452332A1 EP89912451A EP89912451A EP0452332A1 EP 0452332 A1 EP0452332 A1 EP 0452332A1 EP 89912451 A EP89912451 A EP 89912451A EP 89912451 A EP89912451 A EP 89912451A EP 0452332 A1 EP0452332 A1 EP 0452332A1
Authority
EP
European Patent Office
Prior art keywords
pulses
setpoint
circuit
dosing
variable
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.)
Pending
Application number
EP89912451A
Other languages
German (de)
English (en)
Inventor
Alfred Hauptkorn
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.)
Kubota Brabender Technologie GmbH
Original Assignee
Brabender Technologie KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brabender Technologie KG filed Critical Brabender Technologie KG
Publication of EP0452332A1 publication Critical patent/EP0452332A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
    • G01G11/08—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having means for controlling the rate of feed or discharge
    • 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
    • G01G13/28—Weighing mechanism control arrangements for automatic feed or discharge involving variation of an electrical variable which is used to control loading or discharge of the receptacle
    • G01G13/29—Weighing mechanism control arrangements for automatic feed or discharge involving variation of an electrical variable which is used to control loading or discharge of the receptacle involving digital counting
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials

Definitions

  • the invention relates to a metering device for flowable substances, such as granules, powders and liquids, consisting of a fabric container provided with a controllable emptying device, a weighing device for the fabric container or for a conveyor line downstream of the emptying device, and one with a rake ⁇ factory-provided electronic circuit for regulating and controlling the emptying device, which counts the digital measuring pulses of the weighing device formed in a period of time, compares them with a target value and, in the event of a deviation, forms a manipulated variable for the emptying device.
  • a metering device for flowable substances such as granules, powders and liquids
  • dosing differential scales are known in which the speed of the dosing device is regulated by comparing an actual value determined by weighing with a setpoint value in order to achieve a constant delivery rate.
  • the actual value can be determined either by reducing the weight when emptying a container filled with the dosing material or by determining the weight of a conveying path loaded by the dosing material.
  • a control intervention must take place even with a very small change in the measuring pulses.
  • external influences on the weighing device such as vibrations, impacts, etc. Like., considerable disturbance variables that lead to serious incorrect dosing.
  • the weight proportional, digital measurement signal is formed. This can be done either by digitizing an analog measurement signal or directly using a digital weighing device in which the changes in the frequencies are measured.
  • the measuring pulses and clock pulses are stored by means of gate circuits. The number of measuring pulses stored in predetermined time spans is compared with a predetermined number. To monitor the control, the pitch angle is determined in the measurement phases and compared with the previously determined pitch angle. If more than a predetermined number of measuring points fall out during the comparison, the emptying device continues at the previously determined and stored speed. The control is thus blocked.
  • the control is only switched on again when the deviations of successive measurement periods lie within the predetermined limits in the subsequent measurements.
  • a correction factor is determined in the embodiment known from DE-OS 2754527 in an operating state in which the dosing material is retained on the weighing device.
  • the vibrations of the metering drive are determined and stored in the computer as digitized values. These are then subtracted from the measurement signals determined at the same time.
  • the control loop is interrupted and the previously stored sample values are used to control the metering device.
  • a switch is made from the regulated gravimetric operation to the only controlling volumetric operation during the duration of the filling.
  • the known metering devices have the disadvantage that the response sensitivity cannot be set sufficiently fine because of the disturbance variables to be taken into account. Filtering out disturbance variables is usually at the expense of measuring accuracy.
  • Another disadvantage is that in the event of vibration, impact and The control circuit is interrupted on the weighing device and is further controlled with the previously stored control variable as a fixed value, ie volumetric dosing takes place, but this does not permit exact dosing.
  • the invention is based on the object of designing a metering device of the generic type in such a way that gravimetric metering is maintained in the event of external interference and / or when the container from which the substance is removed is refilled, that is to say under all operating conditions .
  • the circuit has a device for forming and processing a base value, which stores the measuring pulses of the weighing device in one or more conveying speeds of the emptying device prior to operational use of the metering device in an environmentally trouble-free setting operation , converted to the adjustment range with the aid of the setpoint, the base values of the measurement pulses formed during operational use are excessive during the occurrence.
  • Measuring pulses or occasionally mixed in by a clock generator which compares the mixed values with the setpoint and, in the event of a deviation, forms the manipulated variables for the emptying device.
  • a support value is created according to the invention, which is formed prior to operational use in a setting mode, in which external interference, such as impacts, shocks and the like. Like. Be kept away from the dosing device, but the other operating conditions are present, that is, the filled substance container is emptied.
  • the base values therefore represent measured values which to a certain extent arise under idealized operating conditions.
  • the setting operation can take place, for example, at a trouble-free location.
  • the base values obtained in the setting mode are stored and can be added to the measured values determined for support in a subsequent operational use of the metering device at the place of use, the mixed value being an adapted differential value, the base value portion of which acts towards averaging and which forms the controlled variable by comparison with the setpoint. If excessive measuring impulses occur during the dosing process, the added supporting value components have a dampening effect.
  • the control loop is advantageously retained, that is to say gravimetric metering is maintained. The actual measuring impulses go further into the control loop.
  • the mixing ratio can be set or controlled as desired by reading the operationally determined measuring pulses and the base values into a shift register in a ratio that can be set or controlled on the clock generator. If there is essentially trouble-free operation, no base values need to be added at all, so that normal control operation takes place. If a certain, relatively uniform basic disturbance occurs, the proportion of the base value can be chosen so large that a sufficient averaging is formed, which ensures constant dosing. If, on the other hand, irregular, large disturbance values occur, the proportion of the base value can be set higher by control.
  • the operationally determined measuring pulses are expediently passed through a filter, the bandwidth of which can be set permanently or is dynamically controlled by the supporting values. The bandwidth should be adapted to a desired sensitivity.
  • the invention provides a development in which the circuit is provided with a device for forming and processing a compensation variable which stores the operationally determined measuring pulses of a larger number of measuring cycles and by comparison with the setpoint, a correction variable is formed which is added to the controlled variable by means of an addition stage.
  • the compensation variable is formed by the actual measuring pulses and belongs to the control loop, but processing them leads to a certain damping. This channel leads to a long-term correction.
  • the addition ratio of the mixed value and the compensation variable can be set as desired, so that dosing can only be carried out gravimetrically with the compensation variable as the control variable. Alternatively, the compensation variable can be used for tax purposes.
  • the circuit is provided with a device for forming and processing a compensation variable, which stores the operationally determined measurement pulses of a larger number of measurement cycles and their output signals compared to the setpoint value for adapting the support value, the support memory and / or for changing the clock ratio be fed to the clock. If the compensating variable changes by a predetermined amount, on the one hand the base value is adjusted by increasing or decreasing it and / or the mixture ratio of the normal difference value and the base size is changed accordingly.
  • FIG. 1 shows an electronic circuit in a block diagram for a metering device with an additional circuit for forming a base value
  • Fig. 2 shows the subject of Fig.l with an additional
  • Fig. 3 shows the subject of Fig. 2 with an additional circuit to form a control-related compensation variable.
  • the electronic circuit shown in FIG. 1 serves to regulate and control the emptying device of a metering device for flowable substances, such as granules, powder and liquids.
  • the dosing device not shown in the drawing, consists in a known manner of a material container provided with a controllable emptying device. Two weighing systems are known. In one, the fabric container with the associated controllable emptying device is arranged on a weighing device, which generates measurement pulses corresponding to the weight loss.
  • the material container with the associated controllable emptying device can be arranged in a stationary manner, and the emptying device conveys the material to a downstream conveyor line, for example a metering belt or the like, which is arranged on a scale.
  • arithmetic logic unit is assigned to the electronic circuit.
  • the weight decrease of the unit consisting of the emptying device and the material container is determined, and in the other embodiment, a change in the weight of the conveying path is ascertained.
  • the weighing device is assigned an electronic measuring cell MZ, which forms and stores digital measuring pulses proportional to the change in weight.
  • analog measuring signals are first formed, which are converted into digital measuring pulses by an analog / digital converter.
  • measuring cells for weighing devices which directly generate digital measuring pulses.
  • the digital measuring pulses stored in the measuring cell MZ are called up cyclically by a microprocessor MP.
  • the microprocessor MP is designed so that it by filtering, by serial transmission, for. B. a sliding register, and by averaging forms a numerical quantity proportional to the change in weight.
  • the numerical variable is fed to a difference generator D1, which forms a difference value from the two variables last read.
  • the difference value is then passed through a filter stage F1, which limits the difference value to a predetermined bandwidth, which is fixed in the embodiment according to FIG. 1.
  • the limited difference value is applied to a shift register SR via a switch F1, the function of which is described in more detail below.
  • the signal passes to a comparison stage 'VS1, which compares the difference value with a desired value, which is read by a reference value generator SW.
  • the comparison variable of the comparison stage VS1 is fed to a controller R1, which forms the manipulated variable for the drive M of the conveyor device. This control loop is used for the normal regulation of the dosing device.
  • the numerical variable formed by the microprocessor MP and proportional to the change in weight is further fed to a base value memory SS which forms base variables from the numerical quantities obtained in a setting operation which is free from environmental problems.
  • a base value memory SS which forms base variables from the numerical quantities obtained in a setting operation which is free from environmental problems.
  • the dosing device as a whole is operated at a trouble-free location.
  • the material container is filled and the metering device is operated.
  • the numerical quantities of the microprocessor MP that are produced and are proportional to the weight reduction are entered into the basic value memory. This compares the values with the setpoint. If it is a differential dosing device, the corresponding support values are calculated for different conveyor speeds.
  • the metering device is then set up at the place of use and is available for operational use.
  • the support variables remain in the support value memory SS and can be called up as required.
  • a circuit is additionally arranged with which a long-term correction is made possible.
  • This additional circuit consists of a difference generator D2, which receives the numerical values from the microprocessor MP and stores them in long-term cycles. It forms a difference value from the two last read values.
  • This difference value of the difference generator B2 differs from the difference value of the difference generator Dl only by the time of the measurement value acquisition.
  • the difference generator D2 is designed in such a way that the detection cycles are approximately ten times as large as that of the difference generator D1.
  • the difference values of the difference generator D2 are fed to a comparison stage VS2. Its comparison value can be used in various ways. In the embodiment according to FIG. 2, it is used for a controlled variable for a controller R2. This formed manipulated variable is together with the Control variables coming from the controller R1 are fed to an addition stage A, which creates a mixed control variable for the drive M of the emptying device.
  • the comparison values of the comparison stage VS2 are used for control purposes.
  • the comparison values serve as a control variable for adapting the base value by being supplied to the base value memory SS.
  • Control of the clock ratio is also provided in FIG. 3.
  • the comparison variable is fed to the clock generator T. Both measures can be provided alone or together.
  • 1 to 3 can also be modified in such a way that the one clock generator is put into operation when excessive measuring pulses occur.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Flow Control (AREA)
  • Basic Packing Technique (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Un dispositif de dosage pour des substances coulantes, comme les granulats, les poudres ou les liquides, se compose d'un réservoir équipé d'un dispositif d'évacuation réglable et d'un dispositif de pesée pour le réservoir ou pour une voie de transport placée à la suite du dispositif d'évacuation. A ces équipements est associé un circuit électronique équipé d'une unité de calcul servant à réguler et à commander le dispositif d'évacuation, circuit qui compte les impulsions numériques de mesure fournies par le dispositif de pesée dans un intervalle de temps déterminé, qui les compare à une valeur de consigne et qui détermine, dans le cas d'un écart, une valeur de réglage pour le dispositif d'évacuation. Pour pouvoir conserver un dosage gravimétrique en cas de perturbations extérieures et/ou lors d'un nouveau remplissage du réservoir dans lequel est prélevée la substance, le circuit présente un dispositif permettant d'établir et de traiter un noeud d'interpolation, dispositif qui mémorise, avant une utilisation du dispositif de dosage pour l'exploitation dans un mode de réglage ne présentant pas de risques pour l'environnement, pour une ou plusieurs vitesses de transport du dispositif d'évacuation, les impulsions de mesure du dispositif de pesée, qui transforme ces impulsions en plage de réglage au moyen de la valeur de consigne et qui mélange les noeuds d'interpolation avec les impulsions de mesure obtenues en exploitation pendant la formation d'impulsions de mesure excessives ou par périodes au moyen d'une horloge. En outre, le circuit compare les valeurs mixtes avec la valeur de consigne et détermine, dans le cas d'un écart, les valeurs de réglage pour le dispositif d'évacuation.
EP89912451A 1989-10-30 1989-10-30 Dispositif de pesee et de dosage pour substances coulantes Pending EP0452332A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89202968A EP0425735B1 (fr) 1989-10-30 1989-10-30 Dispositif de dosage par poids pour matière coulante

Publications (1)

Publication Number Publication Date
EP0452332A1 true EP0452332A1 (fr) 1991-10-23

Family

ID=8202510

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89912451A Pending EP0452332A1 (fr) 1989-10-30 1989-10-30 Dispositif de pesee et de dosage pour substances coulantes
EP89202968A Expired - Lifetime EP0425735B1 (fr) 1989-10-30 1989-10-30 Dispositif de dosage par poids pour matière coulante

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89202968A Expired - Lifetime EP0425735B1 (fr) 1989-10-30 1989-10-30 Dispositif de dosage par poids pour matière coulante

Country Status (6)

Country Link
US (1) US5152354A (fr)
EP (2) EP0452332A1 (fr)
AT (1) ATE92624T1 (fr)
DE (1) DE58905181D1 (fr)
ES (1) ES2042983T3 (fr)
WO (1) WO1991006835A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4309109A1 (de) * 1993-03-22 1994-09-29 Schenck Ag Carl Verfahren zur Störausblendung bei einer Differentialdosierwaage und Vorrichtung zur Durchführung des Verfahrens
DE59306533D1 (de) * 1993-07-01 1997-06-26 Gericke Gmbh Verfahren zur Steuerung der Dosierleistung einer Differentialdosierwaage
DE4332062A1 (de) * 1993-09-21 1995-03-23 Pfister Gmbh Verfahren und Vorrichtung zum gravimetrischen Dosieren von Schüttgut
US5375634A (en) * 1993-10-07 1994-12-27 Graco Inc. Variable mass flow rate fluid dispensing control
DE19904166A1 (de) * 1999-02-03 2000-08-10 Bosch Gmbh Robert Verfahren zur Durchflußmessung
WO2003037752A2 (fr) * 2001-11-01 2003-05-08 Hans Dahl Systeme de distribution conteneurise
US6811301B2 (en) 2002-03-29 2004-11-02 Hydreclaim, Inc. Feeder control system for an automated blender system
DE102007055685B4 (de) * 2007-11-21 2010-03-18 Brabender Gmbh & Co.Kg Dosiereinheit und Verfahren zum gezielten Dosieren von Fluiden
CN106017624A (zh) * 2016-07-23 2016-10-12 蚌埠日月仪器研究所有限公司 一种对皮带输送机进行称重的方法及称重装置
US10472219B2 (en) * 2016-08-02 2019-11-12 Praxidyn Ip Holdings, Llc Agricultural container processing and reconciliation system

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Publication number Priority date Publication date Assignee Title
US3670833A (en) * 1970-08-25 1972-06-20 Yawata Iron & Steel Co Method for measuring a weighing load rapidly
US4111272A (en) * 1976-12-07 1978-09-05 Acrison, Incorporated Weigh feeding apparatus
CA1094039A (fr) * 1976-04-19 1981-01-20 Angelo Ferrara Systeme d'alimentation a debit commande automatiquement
ES466708A1 (es) * 1978-01-20 1979-08-16 Ramoneda Sibidi Juan Dispositivo para pesar
FR2544492B1 (fr) * 1983-04-18 1986-11-21 Manurhin Procede et dispositif de dosage ponderal d'une poudre
US4775949A (en) * 1986-06-27 1988-10-04 K-Tron International, Inc. Weigh feeding system with stochastic control
AU7761887A (en) * 1986-08-27 1988-03-03 South African Inventions Development Corp. Method and apparatus for controlling rate of material feed
EP0291553B1 (fr) * 1987-05-21 1991-07-10 Carl Schenck Ag Méthode pour régler une balance de dosage différentielle, en particulier pour matériaux en vrac, et une balance de dosage différentielle pour l'application de la méthode

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9106835A1 *

Also Published As

Publication number Publication date
DE58905181D1 (de) 1993-09-09
EP0425735A1 (fr) 1991-05-08
EP0425735B1 (fr) 1993-08-04
ES2042983T3 (es) 1993-12-16
US5152354A (en) 1992-10-06
ATE92624T1 (de) 1993-08-15
WO1991006835A1 (fr) 1991-05-16

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