EP0640383B1 - Procédé et dispositif de contrÔle d'entraînement d'un dispositif de mélange - Google Patents

Procédé et dispositif de contrÔle d'entraînement d'un dispositif de mélange Download PDF

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Publication number
EP0640383B1
EP0640383B1 EP94112222A EP94112222A EP0640383B1 EP 0640383 B1 EP0640383 B1 EP 0640383B1 EP 94112222 A EP94112222 A EP 94112222A EP 94112222 A EP94112222 A EP 94112222A EP 0640383 B1 EP0640383 B1 EP 0640383B1
Authority
EP
European Patent Office
Prior art keywords
shaft
speed
outer shaft
inner shaft
mixing
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.)
Expired - Lifetime
Application number
EP94112222A
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German (de)
English (en)
Other versions
EP0640383A1 (fr
Inventor
Werner Heimbeck
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
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Individual
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Filing date
Publication date
Priority claimed from DE4335612A external-priority patent/DE4335612C1/de
Application filed by Individual filed Critical Individual
Publication of EP0640383A1 publication Critical patent/EP0640383A1/fr
Application granted granted Critical
Publication of EP0640383B1 publication Critical patent/EP0640383B1/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/10—Mixers with rotating receptacles with receptacles rotated about two different axes, e.g. receptacles having planetary motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/403—Disposition of the rotor axis
    • B01F29/4035—Disposition of the rotor axis with a receptacle rotating around two or more axes
    • B01F29/40353—Disposition of the rotor axis with a receptacle rotating around two or more axes being perpendicular axes

Definitions

  • the present invention relates to a method for driving control of a mixing device according to the preamble of claim 1 and a mixing device for carrying out the method according to the preamble of claim 10.
  • DE-OS 20 22 259 a device in the form of a rotatable barrel is already known, which can be rotated or tilted about two mutually perpendicular axes.
  • DE 24 08 204 A1 discloses a method and a device for cooling flowable material by means of a coolable and rotatable drum, in which the drum speeds can be set at intervals.
  • a device for homogenizing liquids is known from DE 27 34 488 C2, in which a pipe for receiving liquid is arranged on the rotor at a distance from a rotor axis, to which a pipe drive independent of the rotor drive is assigned.
  • this object is achieved in that the directions of rotation of the inner shaft and outer shaft are periodically changed and that after each change of direction of rotation the respective shaft is driven at a predetermined speed or speed function over time.
  • the direction of rotation of the inner axis is thus reversed at a periodic interval which is characteristic of the inner shaft, and then a predetermined target speed is approached or a specific temporal speed curve is set.
  • the direction of rotation of the outer shaft is reversed at a periodic interval that is characteristic of the outer shaft, and then the outer shaft is brought to a new predetermined target speed or a specific temporal speed curve is set.
  • the target speeds cannot be set at the moment, but, due to the inertia, require a certain amount of time to reach a predetermined speed.
  • the current speed is first brought to zero and then the shaft is brought to the predetermined target speed in the opposite direction.
  • the mixing device is characterized in that the drive means are connected to speed control means which are suitable for changing the speed and direction of rotation of the shafts, and in that the control means are connected to a control unit which has control values corresponding to the predetermined speeds for the inner shaft and for the outer shaft wins in the respective period interval and delivers it to the control means.
  • the control means used according to the invention make it possible to change the speed of the associated drive means by changing the energy supplied to the drive means. The speed is increased or decreased by changing the energy. When the polarity or flow direction is reversed, the direction of rotation is changed.
  • the method according to the invention and the associated mixing device according to the invention are characterized in that mixing sequences are achieved which can be set and reproduced for each mixing operation.
  • the greatest possible shear of the mix is achieved because of the directions of rotation be changed at certain intervals, which leads to effective mixing.
  • an optimal mixing program can be generated for each mix that can be reproduced.
  • the movement sequence, especially the acceleration processes can be adapted to the product to be mixed. Products that tend to agglomerate can experience particularly accelerating mixing processes. Units that are very sensitive can be mixed using a gentle mixing process.
  • the method and the device allow an optimal adaptation to the special properties of the products to be mixed.
  • the mixing process can be influenced by setting the amounts of the target speeds or the amplitudes of the speeds of the shafts and the respective period.
  • the predetermined speeds of successive periods of a shaft are different. This will avoid repetitive, identical mixing processes. By changing the predetermined speed of a period compared to the speed in the previous period, the change of direction is coupled with a changed speed, which increases the mixing effect. In another embodiment, the speeds are the same in at least two successive periods.
  • the speed of each shaft is preferably kept constant after a predetermined target speed has been reached for a period of time that is less than a period.
  • this speed is kept constant for a predetermined period of time in order to adapt the mix to constant conditions.
  • the periods of the inner shaft and outer shaft are preferably about the same length. This favors the technical effort for setting up the periods. It was also found that the same period lengths for the control cycles of inner shaft and outer shaft do not result in disruptive segregation.
  • the rotational speeds of the inner shaft and outer shaft have a phase difference, for example of approximately 90 degrees. This avoids superimposed or opposing movement of the inner shaft and outer shaft. If one shaft is moved through the zero point when changing the direction of rotation, the other shaft has reached its respectively predetermined target speed.
  • the phase difference is preferably approximately 90 °. However, it can be in the range of 60 ° ⁇ ⁇ 120 °.
  • the phase of the outer shaft preferably leads the phase of the inner shaft. Particularly effective mixing was noticed with this setting.
  • the predetermined speeds of the two shafts in adjacent periods are the same or differ by a constant factor. This means that apart from the phase difference, the two shafts are driven at the same speed. This also does not result in segregation, but reduces the technical complexity of the control.
  • each sequence of predetermined speeds is repeated after N sequence elements. The consequence is therefore recursive. Such a repetition of certain mixing processes reduces the control effort or the number of speed values to be generated. At the same time, repetition of longer mixing cycles does not lead to segregation.
  • the sequence of predetermined speed values is obtained by an algorithm, the speed values being obtained, for example, using a recursion formula for a given initial value.
  • an algorithm provides a special distribution of the speed values occurring in a cycle, which improves the mixing effect.
  • a recursion formula of this type is ideal for obtaining values that are recursive according to K 3 values.
  • the sequence of speed values is stored in a memory and called up sequentially.
  • certain empirically preferred mixing cycles can be saved and reproduced for each specific mixing order.
  • control unit has a programmable logic controller in which the stored values can be stored and called up.
  • control unit has a calculation device that calculates the control values based on a recursion formula.
  • the drive means according to the invention can be electric motors, hydraulic motors or pneumatic motors, depending on which drive means is desired for the special case.
  • the control means connected to the drive means are frequency converters in the case of Electric motors, hydraulic valves for the case of hydraulic motors and pneumatic valves for the case of pneumatic motors. If DC motors are selected, control means in the form of speed controllers are provided which change the strength of the current supplied to the DC motor.
  • the frequency converters are used in the case of AC motors that are controlled by changing the frequency.
  • FIG 1 shows the basic structure of an embodiment of the mixing device according to the invention.
  • Fig. 2 is a circuit diagram for the control of the electric motors of the mixing device.
  • Fig. 3 is a control diagram for the speed of a shaft.
  • FIG. 1 an embodiment of the mixing device according to the invention is shown in principle, wherein a mixing container 2 is provided, which is gimbaled.
  • the mixing container 2 is connected to a rotatably mounted inner shaft 4, which is connected to an electric motor 6 via a gear 18.
  • the inner shaft 4 is mounted on a holder 5 of an outer shaft 8, which has a counterweight 20 to compensate for the weight of the holder, which counterweight is connected to the outer shaft 8 opposite the holder 5.
  • the shaft 8 is guided by bearings 22 and ends in a bevel gear 24, which is connected to an electric motor 10.
  • An electrical feed line 30 for the electric motor 6 of the inner shaft 4 is guided through a slip ring bushing 28 into the bevel gear 24 and from there through the hollow outer shaft 8 to the electric motor 6.
  • An electrical feed line 32 is connected to the electric motor 10 of the outer shaft.
  • the electrical lead 32 of the electric motor 10 is connected to the frequency converter 12 for the outer axis 8, while the electrical lead 30 of the electric motor 6 is connected to the frequency converter 14 for the inner axis 4.
  • both frequency converters 12, 14 are supplied with mains voltage.
  • the speed of the associated shaft is increased or decreased.
  • the two frequency converters are connected to a microprocessor 16 which has a programmable logic controller, control values corresponding to the speed values being stored in the memory and being able to be called up by the microprocessor 16 at time intervals which correspond to the respective periods.
  • the microprocessor 16 supplies the control values to the respective frequency converter.
  • FIG. 3 shows a control diagram for the speed of a shaft.
  • One of the frequency converters is first given a target speed value 1, which is achieved by starting the shaft and increasing the speed up to speed value 1.
  • the frequency converter is then instructed by the microprocessor 16 to carry out a change in the direction of rotation and to start a new setpoint speed 2.
  • the frequency converter lowers its frequency and the shaft runs at speed 0 in the opposite direction up to speed value 2.
  • new speed values 3, 4 and 5 are approached which are different from one another and ensure effective mixing of the mix.
  • the period between two successive control values of the microprocessor 16 is the time period t.
  • the control diagram of the other wave differs from the control diagram of FIG. 3 only in that it is t / 2 compared to the control diagram of FIG. 3 is shifted, ie has a phase difference of approximately 90 °.
  • Fig. 4 there is shown a control diagram in which two successive target speeds of a shaft are in opposite directions the same, i.e. have the same amount. After the second speed of the same amount, the speed changes in such a way that it becomes smaller or larger for the following two periods.
  • the ratio of the successive rotational speeds in the same direction is 1/2 or 2 in the present case and is adjustable.
  • the upper and lower speed (ODZ and UDZ) are adjustable, as is the period t and the specified mixing time T.
  • the other shaft is operated with a control diagram shifted by t / 2.
  • the ratio of the successive opposite speeds of this shaft is also adjustable.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (10)

  1. Procédé pour la commande d'entraînement d'un appareil de mélange, qui comporte un réservoir de mélange (2) monté en rotation sur un arbre intérieur (4) et un arbre extérieur (8), dans lequel l'arbre intérieur (4) et l'arbre extérieur (8) enferment ensemble un angle, et peuvent être entraînés séparément l'un de l'autre, caractérisé en ce que les directions de rotation de l'arbre intérieur (4) et de l'arbre extérieur (8) sont modifiées respectivement de manière périodique, et en ce qu'après chaque changement de direction de rotation, l'arbre correspondant est entraîné avec une vitesse de rotation, ou une fonction de vitesse de rotation prédéterminée.
  2. Procédé selon la revendication 1, caractérisé en ce que les vitesses de rotation prédéterminées de périodes successives d'un arbre (4 ; 8) sont différentes.
  3. Procédé selon l'une ou l'autre des revendications 1 ou 2, caractérisé en ce que la vitesse de rotation de chaque arbre (4, 8) est maintenue constante, après avoir atteint une vitesse de rotation de consigne prédéterminée, pendant une durée de temps qui est inférieure à la durée d'une période.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les périodes de l'arbre intérieur (4) et de l'arbre extérieur (8) sont approximativement de la même longueur.
  5. Procédé selon la revendication 4, caractérisé en ce que les évolutions des vitesses de rotation de l'arbre intérieur (4) et de l'arbre extérieur (8) présentent une différence de phase.
  6. Procédé selon l'une ou l'autre des revendications 4 et 5, caractérisé en ce que la phase de l'arbre extérieur précède la phase de l'arbre intérieur.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les vitesses de rotation prédéterminées des deux arbres (4, 8) sont égales dans des périodes voisines.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisée en ce que chaque suite de vitesses de rotation prédéterminées se répète de manière récursive toutes les N périodes successives.
  9. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la suite des valeurs de vitesses de rotation est déposée dans une mémoire et appelée de manière séquentielle.
  10. Appareil de mélange pour mettre en oeuvre le procédé selon l'une des revendications 1 à 9, comprenant un réservoir de mélange (2) monté en rotation sur un arbre intérieur (4) et un arbre extérieur (8), dans lequel l'arbre intérieur (4) et l'arbre extérieur (8) enferment ensemble un angle et peuvent être entraînés séparément l'un de l'autre par des moyens d'entrâinement (6, 10), et dans lesquels les moyens d'entraînement (6, 10) sont reliés à des organes de commande (12, 14) de la vitesse de rotation, qui conviennent pour une modification de la vitesse de rotation et de la direction de rotation des arbres (4, 8), et dans lequel les moyens de commande (12, 14) sont reliés à une unité de commande (16), caractérisé en ce que l'unité de commande détermine les valeurs de commande qui correspondent aux vitesses de rotation prédéterminées pour l'arbre intérieur (4) et pour l'arbre extérieur (8) à des écarts de périodes respectifs (t), et fournit ces valeurs aux moyens de commande (12, 14).
EP94112222A 1993-08-27 1994-08-04 Procédé et dispositif de contrÔle d'entraînement d'un dispositif de mélange Expired - Lifetime EP0640383B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4328825 1993-08-27
DE4328825 1993-08-27
DE4335612 1993-10-19
DE4335612A DE4335612C1 (de) 1993-08-27 1993-10-19 Verfahren zur Antriebssteuerung einer Mischvorrichtung und Mischvorrichtung zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP0640383A1 EP0640383A1 (fr) 1995-03-01
EP0640383B1 true EP0640383B1 (fr) 1996-11-06

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Application Number Title Priority Date Filing Date
EP94112222A Expired - Lifetime EP0640383B1 (fr) 1993-08-27 1994-08-04 Procédé et dispositif de contrÔle d'entraînement d'un dispositif de mélange

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EP (1) EP0640383B1 (fr)
AT (1) ATE144915T1 (fr)
DE (1) DE9320352U1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO940193A1 (it) * 1994-05-06 1995-11-06 Corob Srl Dispositivo di miscelazione di pitture, vernici e prodotti fluidi in generale e procedimento per il suo controllo.
IT232075Y1 (it) * 1994-10-11 1999-08-16 Corob Srl Miscelatore di prodotti generalmente collocati in contenitori e gruppo di sostegno e serraggio per almeno uno di tali contenitori,
ITUD20040137A1 (it) * 2004-06-30 2004-09-30 Cps Color Equipment Spa Macchina miscelatrice per miscelare un prodotto fluido contenuto in un recipiente chiuso, e relativo procedimento di miscelazione
DE102006052861A1 (de) * 2006-11-09 2008-05-15 Zimmermann, Wolfgang, Prof. Dipl.-Ing. Der Astromischer
CN114225778B (zh) * 2021-12-09 2024-03-29 福建龙溪轴承(集团)股份有限公司 一种物料混合摇匀装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969063C (de) * 1942-05-06 1958-04-24 Siemens Ag Knet- und Mischmaschine fuer das Plastischmachen von Rohstoffen oder Halbfabrikaten der chemischen oder Nahrungsmittel-Industrie
DE3626732A1 (de) * 1986-08-07 1988-02-11 Buehler Ag Geb Conche
DE3807658A1 (de) * 1988-03-09 1989-09-21 Zimmermann Wolfgang Der sto-mischer
FR2680887A1 (fr) * 1991-08-30 1993-03-05 Cappelletto Renzo Dispositif de regulation de vitesse destine notamment aux malaxeurs, et nouveau malaxeur destine notamment a la fabrication de sable de fonderie.

Also Published As

Publication number Publication date
EP0640383A1 (fr) 1995-03-01
DE9320352U1 (de) 1994-06-16
ATE144915T1 (de) 1996-11-15

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