EP4299170A1 - Procédé de mélange et mélangeur - Google Patents

Procédé de mélange et mélangeur Download PDF

Info

Publication number
EP4299170A1
EP4299170A1 EP23165084.7A EP23165084A EP4299170A1 EP 4299170 A1 EP4299170 A1 EP 4299170A1 EP 23165084 A EP23165084 A EP 23165084A EP 4299170 A1 EP4299170 A1 EP 4299170A1
Authority
EP
European Patent Office
Prior art keywords
mixing
mixture components
mixer
power
drive
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
EP23165084.7A
Other languages
German (de)
English (en)
Inventor
Dominik Lutz
Alexander Niederquell
Lukas KNIERIM
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.)
Liebherr Mischtecknik GmbH
Original Assignee
Liebherr Mischtecknik GmbH
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 Liebherr Mischtecknik GmbH filed Critical Liebherr Mischtecknik GmbH
Publication of EP4299170A1 publication Critical patent/EP4299170A1/fr
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/212—Measuring of the driving system data, e.g. torque, speed or power data
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2214—Speed during the operation
    • B01F35/22142—Speed of the mixing device during the operation
    • B01F35/221422—Speed of rotation of the mixing axis, stirrer or receptacle during the operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/02—Controlling the operation of the mixing
    • B28C7/022—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component
    • B28C7/026—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component by measuring data of the driving system, e.g. rotational speed, torque, consumed power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • 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

Definitions

  • the present invention relates to a mixing method for mixing mixture components, the mixing being carried out by introducing mechanical power into the mixture components, the power being provided by a drive.
  • the mixing performance usually decreases again as homogeneous properties of the mix are established and the mixing torque decreases. During the rest of the mixing process, the mixing performance is therefore lower than during feeding. As a result, the mixer is oversized for large areas of the mixing process.
  • the point in time at which the mix is sufficiently mixed i.e. the desired mixing quality is present or the final quality of the mix is reached, is usually estimated according to the state of the art.
  • the mix can be assessed visually, for example using a camera.
  • the mixing performance curve turns into an asymptote, like this Fig. 2 emerges. It can be assumed that if the mixing performance is approximately horizontal, there will no longer be any change in consistency or change in the mixing quality. This point in time is currently estimated by the mixing master, for example, and is therefore dependent on the mixing master's personal experience and is therefore not reproducible.
  • the present invention is based on the object of providing a mixing process in which the installed nominal power of the drive is better utilized.
  • the mixing takes place at least partially at controlled power and/or that a mixing quality of the mixture components is determined.
  • the mixture components preferably produce the mixture.
  • a performance-controlled mixing process is preferably provided to shorten the mixing time and maintain constant machine utilization.
  • a defined and reproducible method for determining the required homogeneity of the mixture or for determining the point in time at which the required final quality of the mixture is achieved and the mixer can be emptied is preferably provided.
  • the output of a stationary mixing system is preferably increased by optimally utilizing the installed engine power.
  • the point in time at which the final quality of the mixture is achieved is preferably determined by a defined measuring method.
  • the speed of the drive is preferably adjusted during the mixing process so that the motor power, i.e. the drive power, is constantly regulated to an optimal value.
  • the mixture components comprise a liquid, such as water, a binder, such as cement, and an aggregate, such as aggregate, and in the mixed state include or are concrete.
  • the power is introduced by moving or rotating a mixing tool and/or by moving or rotating a mixing container.
  • the drive is a rotating drive and is only operated up to a maximum speed.
  • the method according to the invention advantageously reduces energy consumption.
  • the mixing quality is determined by the change in the force or torque of the drive and a desired mixing quality is considered to have been achieved when the change in the force or torque remains below a defined value for a defined time. It can be provided that the mixture components are emptied after the desired mixing quality has been achieved.
  • the defined value is preferably zero.
  • the change, i.e. the derivative, of the force or torque is then preferably negative, which means that the force or torque decreases.
  • the condition of the mixture i.e. the quality of the mixture
  • the condition of the mixture is preferably assessed based on the derivation of the torque signal. Mixing too long or too short is preferably excluded and consistent quality is preferably guaranteed.
  • the mixing takes place between loading a mixing container with the mixture components and emptying the mixture components from the mixing container, the mass of the mixture components that are emptied from the mixing container being over 90%, preferably over 95 or 98%. corresponds to the mass of the mixture components with which the mixing container was charged.
  • a high speed when emptying preferably results in less residual material remaining in the mixer. This ensures the purity of subsequent mixtures.
  • the invention also relates to a mixer which has means which are designed to carry out a mixing method according to the invention and/or a frequency converter and/or a programmable controller.
  • the mixer is preferably operated with a frequency converter in combination with a programmable control.
  • the mixer is a stationary or mobile concrete mixer, a concrete mixing plant or a truck mixer or a component of one of these machines.
  • a stationary mixer is provided with at least one mixing tool rotating in a mixing container.
  • the mixing tool is driven by an electric motor.
  • the top left diagram shows the mixing performance at constant speed as the mixing parameter and the bottom left diagram shows the speed at constant speed as the mixing parameter.
  • the upper right diagram shows the mixing performance with controlled mixing performance as a mixing parameter.
  • the right middle diagram shows the speed with controlled mixing power as the mixing parameter and the bottom right diagram shows the derivation of the mixing torque as the mixing parameter.
  • T mixed const denoted in Fig. 1 the mixing time that an uncontrolled mixing process with constant speed requires to achieve the desired mixing quality or final quality.
  • T mixed regulated denoted in Fig. 1 the mixing time that the controlled mixing process requires to achieve the desired mixing quality.
  • n const denotes in Fig. 1 the constant speed that is set in a mixing process according to the prior art.
  • n max denotes in Fig. 1 the maximum speed that should not be exceeded.
  • t M const denotes in Fig. 1 the time in which the derivative of the torque should be within the predefined limits so that the desired mixing quality is considered to have been achieved.
  • ⁇ min denotes in Fig. 1 the area in which the derivative of the torque should be over a defined period of time so that the desired mixing quality is considered to have been achieved.
  • P target is the motor power that is controlled during the mixing process.
  • a maximum speed (n max ) is defined to protect the mechanical components of the drive train, which should not be exceeded.
  • ⁇ t % T Mix const . ⁇ T Mix regulated T Mix const .
  • the torque is directly proportional to the motor current and can therefore be measured via the motor current.
  • the torque that the drive must generate in order to rotate the mixing tools at a certain speed changes during the mixing process.
  • An assessment criterion for the condition of the mixture is the change over time, i.e. the derivative or the differential quotient, of the torque signal. If the derivative of the torque signal at the end of the mixing process falls below a certain value, such as ⁇ min in Fig. 1 the mixture has reached its final state and the mixing process is complete.
  • the parameter t M const is implemented in terms of control technology. This indicates how long the derivative of the torque ⁇ Min must be undershot before it is ensured that the final quality of the mixture has been achieved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP23165084.7A 2022-06-30 2023-03-29 Procédé de mélange et mélangeur Pending EP4299170A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022116309.1A DE102022116309A1 (de) 2022-06-30 2022-06-30 Mischverfahren und Mischer

Publications (1)

Publication Number Publication Date
EP4299170A1 true EP4299170A1 (fr) 2024-01-03

Family

ID=85782064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23165084.7A Pending EP4299170A1 (fr) 2022-06-30 2023-03-29 Procédé de mélange et mélangeur

Country Status (2)

Country Link
EP (1) EP4299170A1 (fr)
DE (1) DE102022116309A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3480261A (en) * 1967-04-11 1969-11-25 Wilhelm Eirich Process of mixing
US3630495A (en) * 1970-11-12 1971-12-28 Walter N Carroll Mixer unit
DE102015225810A1 (de) * 2015-12-17 2017-06-22 Universität Stuttgart Institut für Werkstoffe im Bauwesen (IWB) Verfahren zur Betonherstellung
WO2018084478A2 (fr) * 2016-11-04 2018-05-11 김종석 Dispositif d'agitation à économie d'énergie à diagnostic préliminaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3480261A (en) * 1967-04-11 1969-11-25 Wilhelm Eirich Process of mixing
US3630495A (en) * 1970-11-12 1971-12-28 Walter N Carroll Mixer unit
DE102015225810A1 (de) * 2015-12-17 2017-06-22 Universität Stuttgart Institut für Werkstoffe im Bauwesen (IWB) Verfahren zur Betonherstellung
WO2018084478A2 (fr) * 2016-11-04 2018-05-11 김종석 Dispositif d'agitation à économie d'énergie à diagnostic préliminaire

Also Published As

Publication number Publication date
DE102022116309A1 (de) 2024-01-04

Similar Documents

Publication Publication Date Title
DE2855324C2 (de) Verfahren zur Regelung der Wasserzugabe bei der Betonzubereitung und Vorrichtung zur Durchführung des Verfahrens
EP3140041B1 (fr) Broyeur à cylindres et son procédé de commande
EP0130278B1 (fr) Moulin de raffinage à cylindres, à fonctionnement réglable, pour chocolat
DE1808998A1 (de) Verfahren und Vorrichtung zur automatischen Befeuchtung von Mischguetern
EP0485901A1 (fr) Procédé de pressurage et dispositif pour sa mise en oeuvre
EP4299170A1 (fr) Procédé de mélange et mélangeur
DE19511585B4 (de) Verfahren und Vorrichtung zur Betonbereitung in einem Trommelmischsystem
DE2639787A1 (de) Verfahren und vorrichtung zur regelung der luntendicke in einer karde
DE1299213B (de) Verfahren und Vorrichtung zum Schwerkraftmischen von pulverfoermigen bis koernigen Guetern
DE2940045A1 (de) Verfahren zum auspressen von klaerschlaemmen mittels einer kammerfilterpresse und vorichtung zur durchfuehrung des verfahrens
DE3240057A1 (de) Verfahren zum betrieb einer vorrichtung zum zerkleinern, mischen und/oder ruehren von substanzen
DE2111380C3 (fr)
DE1683811A1 (de) Verfahren zur Intensivaufbereitung von bindemittelhaltigen Baustoffmischungen
AT406847B (de) Verfahren zur regelung einer schneckenpresse
EP0485772A2 (fr) Procédé de mesure de la granulométrie ou de la densité en vrac, appareil pour la mise en oeuvre de ce procédé, et appareil de commande comprenant un tel appareil
EP0640383B1 (fr) Procédé et dispositif de contrÔle d'entraînement d'un dispositif de mélange
EP3231504B1 (fr) Mélangeur
DE2223792A1 (de) Vorrichtung zum mischen und kneten, insbesondere von schokoladenmasse
DE3113129A1 (de) Verfahren zum mischen von wasser, zement und fuellstoff
DE1683811C3 (de) Verfahren zur Intensivaufbereitung von bindemittelhaltigen Baustoffmischungen
DE2715307C2 (de) Kegelschneckenmischer
EP2686485B1 (fr) Procédé d'opération d'une installation de mélange d'asphalte, en particulier continue, et installation de mélange d'asphalte
DE2414074A1 (de) Verfahren und vorrichtung zum herstellen von transportbeton
DE3918527A1 (de) Vorrichtung und verfahren zur entsorgung von klaerschlamm
EP0492080A1 (fr) Procédé et appareillage pour contrôler le fonctionnement d'un broyeur à rouleaux

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

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

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR