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EP4019218B1 - Filling device for a concrete mixing plant - Google Patents

Filling device for a concrete mixing plant Download PDF

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Publication number
EP4019218B1
EP4019218B1 EP21204194.1A EP21204194A EP4019218B1 EP 4019218 B1 EP4019218 B1 EP 4019218B1 EP 21204194 A EP21204194 A EP 21204194A EP 4019218 B1 EP4019218 B1 EP 4019218B1
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EP
European Patent Office
Prior art keywords
aggregate
filling device
transport device
belt
feed hopper
Prior art date
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Application number
EP21204194.1A
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German (de)
French (fr)
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EP4019218A1 (en
Inventor
Klaus Härle
Mark Wörner
Reinhold Kletsch
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
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Liebherr Mischtecknik GmbH
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Publication of EP4019218A1 publication Critical patent/EP4019218A1/en
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Classifications

    • 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
    • B28C7/0046—Storage or weighing apparatus for supplying ingredients
    • B28C7/0053—Storage containers, e.g. hoppers, silos, bins
    • B28C7/0069—Storage containers, e.g. hoppers, silos, bins having compartments
    • 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
    • B28C7/0046—Storage or weighing apparatus for supplying ingredients
    • B28C7/0053—Storage containers, e.g. hoppers, silos, bins
    • B28C7/0076—Parts or details thereof, e.g. opening, closing or unloading means
    • 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
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/0481—Plant for proportioning, supplying or batching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C9/00—General arrangement or layout of plant
    • B28C9/04—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages
    • B28C9/0481—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages with means for loading the material from ground level to the mixing device, e.g. with an endless conveyor or a charging skip
    • B28C9/049—General arrangement or layout of plant the plant being mobile, e.g. mounted on a carriage or a set of carriages with means for loading the material from ground level to the mixing device, e.g. with an endless conveyor or a charging skip with at least a storage compartment for one of the ingredients
    • 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
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
    • B28C7/08—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips
    • B28C7/0835—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips using skips to be hoisted along guides or to be tilted, to charge working-site concrete mixers
    • B28C7/0847—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips using skips to be hoisted along guides or to be tilted, to charge working-site concrete mixers the skips being hoisted along vertical or inclined guides
    • B28C7/0852—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips using skips to be hoisted along guides or to be tilted, to charge working-site concrete mixers the skips being hoisted along vertical or inclined guides and being tilted in their upmost position for discharging them at their upper side

Definitions

  • the invention relates to a feeding device for a concrete mixing plant.
  • Concrete mixing plants are used to produce concrete. They comprise a rock silo and a mixing plant to mix the rock aggregate stored in the silo with cement and water to make concrete. The fresh concrete produced in this way can then be delivered to a truck mixer. Modern concrete mixing plants typically use multi-chamber silos, in whose chambers different rock aggregates can be stored, which can be used to produce different concrete recipes.
  • concrete mixing plants regularly include a feeding device, the main components of which are a feed hopper and a transport system that is usually made up of several parts.
  • Common transport systems include a vibrating chute, a bucket elevator and a feed belt.
  • the vibrating chute is used to convey the aggregate to the bucket elevator, which is the core of the transport system and bridges most of the distance between the outlet of the feed hopper and the entrance of the silo.
  • the aggregate is then transported from the bucket elevator to the entrance of the silo via the feed belt.
  • the feed belt is typically followed by a rotary distributor belt to direct the aggregate into a specific silo chamber.
  • Generic feeding devices for concrete mixing plants are examples from the CN 109 465 966 A , the CN 108 381 781 A , the JPH06 23734 A or the CN 210 820 236 U known, whereby CN 210 820 236 U a feeding device for a concrete mixing plant according to the preamble of claim 1 is disclosed.
  • the object of the invention is to overcome these disadvantages of the prior art and to increase the efficiency of feeding devices.
  • the invention relates to a feeding device for a concrete mixing plant with a feed hopper for an aggregate and a multi-part
  • Transport system for conveying the aggregate from an outlet of the feed hopper to an inlet of a multi-chamber silo
  • the multi-part transport system comprises an initial transport device, a central transport device and a final transport device in a staggered arrangement.
  • the feeding device has at least two feed hoppers and the initial transport device is designed to convey aggregate from the outlets of the at least two feed hoppers in the direction of the central transport device; and wherein the final transport device has a distribution device that can be rotated and reversible in a clockwise and anti-clockwise direction about a vertical axis.
  • the distribution device can be a rotary distribution belt.
  • the central transport device is preferably a bucket elevator.
  • the central transport device and the transport system as a whole have a conveying capacity of more than 200 m 3 /h, in particular greater than 300 m 3 /h.
  • a conveying capacity of more than 200 m 3 /h, in particular greater than 300 m 3 /h.
  • designs with lower conveying capacities are also possible.
  • the invention according to claim 1 provides that the initial transport device has a belt conveyor and the belt conveyor is designed to transport aggregate from the at least two feed hoppers.
  • the initial transport device has at least two transfer devices in order to convey aggregate from the outlets of both feed hoppers onto belt conveyors. It is preferred that the two transfer devices can be controlled individually.
  • the transfer devices are preferably vibrating chutes. If, for example, only one of the feed hoppers is full, a stronger vibration and thus a higher conveying capacity can be selected on the associated vibrating chute than if both feed hoppers are full. In this way, regardless of whether one or both feed hoppers are completely full, the maximum conveying capacity of the transport system can be used as fully as possible.
  • the material detector is arranged on the belt conveyor in the area of the at least two transfer devices, in particular in the conveying direction directly after the at least two transfer devices.
  • the material detector can be arranged above the belt conveyor. Such positioning has proven to be particularly advantageous.
  • at least two individual material detectors can be provided, with one of the material detectors being assigned to each of the feed hoppers.
  • Each of the material detectors is arranged in particular in the area of the belt conveyor (preferably above the belt conveyor) and directly after the respective transfer device of the assigned feed hopper. In this way, emptying of each feed hopper can be determined individually.
  • the sections of the distribution device which extend in opposite directions starting from the area through which its vertical axis of rotation runs are of equal length.
  • the vertical axis of rotation therefore extends through the middle of the distribution device.
  • the conveying means in particular the stub belt, empties the aggregate onto the distribution device preferably in this area.
  • the feeding device has a reading device for automatically reading information about an aggregate to be fed into the feed hopper.
  • the reading device can be designed to automatically read QR codes, RFID tags or other electronically generated labels.
  • a control unit of the feeding device can use the read information to determine a specific target chamber for the material in the multi-chamber silo.
  • the feeding device has a control unit which is designed to detect a complete emptying of a feed hopper on the basis of a signal from the material detector, to determine a follow-up time and, after the follow-up time has elapsed, to initiate a readjustment of the distribution device, wherein, as part of the readjustment of the distribution device, the direction of rotation of the distribution device about the vertical axis and the conveying direction of the distribution device are determined taking into account the actual and the target position in such a way that the required angle of rotation about the vertical axis is minimal.
  • the next emptying process can then be started, taking into account the positioning time of the distribution device or the rotary distribution belt.
  • the invention further relates to a concrete mixing plant with a multi-chamber silo and a feeding device according to the invention.
  • the mixing plant typically also comprises a mixer for mixing aggregates stored in the silo with Cement, which can be kept in a separate silo or container in the mixing plant, and water are mixed to form concrete.
  • the fresh concrete produced in this way can then be delivered to a truck mixer via a delivery device in the mixing plant.
  • the concrete mixing plant of the present invention shown comprises two separate feed hoppers 1 and 2 for feeding an aggregate, the outlets of which are each coupled to a transfer device 3 designed as a vibrating chute.
  • the vibrating chutes 3 can be controlled independently of one another and serve to evenly fill the vertical bucket elevator 6 via a belt conveyor 4, which ends at the inlet 7 of the bucket elevator 6.
  • An outlet 8 of the bucket elevator 6 is followed by a conveyor 9 designed as a branch belt and a distribution device 10 designed as a rotary distribution belt in order to transport the aggregate into one of the chambers 12 of the multi-chamber aggregate silo 11.
  • a conveyor 9 designed as a branch belt
  • a distribution device 10 designed as a rotary distribution belt in order to transport the aggregate into one of the chambers 12 of the multi-chamber aggregate silo 11.
  • each chamber 12 there is a continuous filling indicator 13.
  • bucket elevator 6 and stitch belt 9 can also be provided, for example a single belt conveyor or an S-conveyor.
  • the material sensors 5 signal a control unit (not shown) during operation, when a feed hopper 1 or 2 is completely empty, in order to mark the beginning of a necessary run-on time in the event of a material change.
  • the control unit takes into account the time required for material transport of the aggregate from the vibrating chute 3 via the belt conveyor 4, the bucket elevator 6, the stub belt 9 and the rotary distributor belt 10 into the silo chamber 12 of the rock silo 11.
  • the run-on time can be optimally shortened by appropriate positioning of the material sensors 5 depending on the conveyor belt speed and the conveyor distance.
  • a rotary distributor belt is used that is reversible with respect to the (horizontal) conveying direction of the belt and can be rotated in both directions (clockwise and counterclockwise) about a vertical axis.
  • the silo chamber 12 is selected using position switches. By reading the delivery note (e.g. QR code), an error in the chamber selection can be prevented.
  • the delivery note e.g. QR code
  • the silo 11 of this concrete mixing plant can be fed as follows.
  • a truck driver drives to the system and either manually selects silo chamber 12 (e.g. chamber 1) on a control system, or a delivery note is automatically read in, e.g. using a QR code.
  • the information read in contains details about the amount of aggregate and the type of rock. From this, the system's control system determines the correct silo chamber 12.
  • the system control uses the delivery data or manual input to check whether the chamber capacity is sufficient for the delivery quantity. It receives the relevant information on the current fill level from the fill indicator 13.
  • a visual check can also be carried out using a suitable display such as an LED display.
  • the control system To reposition the rotary distributor belt 10, the control system detects the fastest possible position change to move the rotary distributor belt 10 from an actual position to a target position for feeding the new silo chamber 12, whereupon the direction of rotation of the rotary distributor belt 10 about a vertical axis (clockwise or counterclockwise) and the new conveying direction of the rotary distributor belt are determined.
  • the rotary distributor belt is repositioned accordingly.
  • the feed hopper 1 can be refilled at the same time to start a new cycle.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Description

Die Erfindung betrifft eine Beschickungseinrichtung für eine Betonmischanlage.The invention relates to a feeding device for a concrete mixing plant.

Betonmischanlagen dienen der Herstellung von Beton. Sie umfassen ein Gesteinssilo und ein Mischwerk, um im Silo gelagerte Gesteinskörnungen mit Zement und Wasser zu Beton zu vermischen. Der so hergestellte Frischbeton kann dann an einen Fahrmischer abgegeben werden. In modernen Betonmischanlagen kommen typischerweise Mehrkammersilos zum Einsatz, in dessen Kammern unterschiedliche Gesteinskörnungen gelagert werden können, die zur Herstellung unterschiedlicher Betonrezepturen verwendet werden können.Concrete mixing plants are used to produce concrete. They comprise a rock silo and a mixing plant to mix the rock aggregate stored in the silo with cement and water to make concrete. The fresh concrete produced in this way can then be delivered to a truck mixer. Modern concrete mixing plants typically use multi-chamber silos, in whose chambers different rock aggregates can be stored, which can be used to produce different concrete recipes.

Um Gesteinskörnungen von einem LKW oder einer mobilen Baumaschine an eine Betonmischanlage aufgeben zu können, umfassen Betonmischanlagen regelmäßig eine Beschickungseinrichtung, deren Hauptbestandteile ein Aufgabetrichter und ein in der Regel mehrteiliges Transportsystem sind. Gängige Transportsysteme umfassen eine Vibrationsrinne, ein Becherwerk und ein Stichband. Die Vibrationsrinne dient zur Förderung der Gesteinskörnung an das Becherwerk, welches das Kernstück der Transportsysteme darstellt und den Großteil der Distanz zwischen Ausgang des Aufgabetrichters und Eingang des Silos überbrückt. Über das Stichband wird die Gesteinskörnung dann vom Becherwerk zum Eingang des Silos transportiert. Im Falle von Mehrkammersilos schließt sich an das Stichband typischerweise ein Drehverteilerband an, um die Gesteinskörnung in eine bestimmte Silokammer leiten zu können.In order to feed aggregates from a truck or a mobile construction machine to a concrete mixing plant, concrete mixing plants regularly include a feeding device, the main components of which are a feed hopper and a transport system that is usually made up of several parts. Common transport systems include a vibrating chute, a bucket elevator and a feed belt. The vibrating chute is used to convey the aggregate to the bucket elevator, which is the core of the transport system and bridges most of the distance between the outlet of the feed hopper and the entrance of the silo. The aggregate is then transported from the bucket elevator to the entrance of the silo via the feed belt. In the case of multi-chamber silos, the feed belt is typically followed by a rotary distributor belt to direct the aggregate into a specific silo chamber.

Um einen große Aufgabemenge pro Zeiteinheit erreichen und ein Becherwerk mit einer Förderleistung von beispielsweise 300 m3/h auslasten zu können, wurden im Stand der Technik sogenannte Doppelaufgabetrichter mit zwei Ausgangsbereichen und zwei Vibrationsrinnen vorgeschlagen. Um bei derartigen Lösungen allerdings die maximale Förderleistung auszunutzen, muss der Doppelaufgabetrichter gleichmäßig beschickt werden, was bedeutet, dass der LKW oder die mobile Baumaschine die gleiche Menge an Material einer Gesteinskörnung in die unterschiedlichen Bereiche des Trichters entleeren muss. Bei ungleichmäßiger Befüllung wird nämlich die Förderleistung beider Vibrationsrinnen und folglich die Förderleistung des Becherwerks nicht über die komplette Zeit vollständig genützt. Ein weiterer Nachteil derartiger Lösungen besteht darin, dass bei einem Materialwechsel der Doppelaufgabetrichter erst nach vollständiger Entladung wieder neu beschickt werden kann.In order to achieve a large feed quantity per unit of time and to be able to fully utilize a bucket elevator with a conveying capacity of, for example, 300 m 3 /h, so-called double feed hoppers with two outlet areas and two vibrating chutes were proposed in the prior art. In order to utilize the maximum conveying capacity with such solutions, however, the double feed hopper must be fed evenly, which means that the truck or mobile construction machine must empty the same amount of material from an aggregate into the different areas of the hopper. If the filling is uneven, the conveying capacity of both vibrating chutes and consequently the conveying capacity of the bucket elevator is not fully utilized over the entire time. A further disadvantage of such solutions is that when changing material, the double feed hopper can only be refilled after it has been completely unloaded.

Ein weiteres Problemfeld bei der Beschickung von Mehrkammersilos sind notwendige Nachlaufzeiten und Stillstandzeiten beim Positioniervorgang des Drehverteilerbandes, wenn es zu einem Materialwechsel bei der Beschickung kommen soll. Gattungsgemäße Beschickungseinrichtungen für Betonmischanlagen sind beispielhaft aus der CN 109 465 966 A , der CN 108 381 781 A , der JPH06 23734 A oder der CN 210 820 236 U bekannt, wobei CN 210 820 236 U eine Beschickungseinrichtung für eine Betonmischanlage nach dem Oberbegriff des Anspruchs 1 offenbart.Another problem area when feeding multi-chamber silos is the necessary follow-up times and downtimes when positioning the rotary distributor belt if a material change is to occur during feeding. Generic feeding devices for concrete mixing plants are examples from the CN 109 465 966 A , the CN 108 381 781 A , the JPH06 23734 A or the CN 210 820 236 U known, whereby CN 210 820 236 U a feeding device for a concrete mixing plant according to the preamble of claim 1 is disclosed.

Aufgabe der Erfindung ist es, diese Nachteile aus dem Stand der Technik zu überwinden und die Effizienz von Beschickungseinrichtungen zu erhöhen.The object of the invention is to overcome these disadvantages of the prior art and to increase the efficiency of feeding devices.

Die vorgenannte Aufgabe wird durch die Kombination der Merkmale des Anspruch 1 gelöst.The above object is achieved by the combination of the features of claim 1.

Demnach betrifft die Erfindung eine Beschickungseinrichtung für eine Betonmischanlage mit einem Aufgabetrichter für eine Gesteinskörnung und einem mehrteiligenAccordingly, the invention relates to a feeding device for a concrete mixing plant with a feed hopper for an aggregate and a multi-part

Transportsystem zur Förderung der Gesteinskörnung aus einem Ausgang des Aufgabetrichters zu einem Eingang eines Mehrkammersilos, wobei das mehrteilige Transportsystem in gestaffelter Anordnung eine initiale Transportvorrichtung, eine zentrale Transportvorrichtung und eine finale Transportvorrichtung umfasst. Weiterhin weist die Beschickungseinrichtung mindestens zwei Aufgabetrichter auf und die initiale Transportvorrichtung ausgebildet ist, Gesteinskörnung aus den Ausgängen der mindestens zwei Aufgabetrichter in Richtung der zentralen Transportvorrichtung zu fördern; und wobei die finale Transportvorrichtung eine um eine Vertikalachse in Uhrzeigersinn und Gegenuhrzeigersinn drehbare und reversierbare Verteileinrichtung aufweist. Bei der Verteileinrichtung kann es sich um ein Drehverteilerband handeln. Ferner umfasst die Beschickungseinrichtung nach Anspruch 1 im Bereich der initialen Transportvorrichtung einen Materialdetektor zur Erkennung einer vollständigen Entleerung der Aufgabetrichter aufweist. Der Materialdetektor kann ein Materialtaster sein. Alternativ oder zusätzlich können aber auch andere Arten von Detektoren, beispielsweise ein optischer Sensor, zum Einsatz kommen.Transport system for conveying the aggregate from an outlet of the feed hopper to an inlet of a multi-chamber silo, wherein the multi-part transport system comprises an initial transport device, a central transport device and a final transport device in a staggered arrangement. Furthermore, the feeding device has at least two feed hoppers and the initial transport device is designed to convey aggregate from the outlets of the at least two feed hoppers in the direction of the central transport device; and wherein the final transport device has a distribution device that can be rotated and reversible in a clockwise and anti-clockwise direction about a vertical axis. The distribution device can be a rotary distribution belt. Furthermore, the feeding device according to claim 1 comprises a material detector in the area of the initial transport device for detecting complete emptying of the feed hopper. The material detector can be a material sensor. Alternatively or additionally, other types of detectors, for example an optical sensor, can also be used.

Mit diesen erfindungsgemäßen Maßnahmen kann eine Effizienzsteigerung erreicht werden. Zum einen können die beiden Aufgabetrichter abwechselnd mit Gesteinskörnung beschickt werden, wodurch die maximale Förderleistung des Transportsystems in der Praxis vollständiger ausgenützt werden kann und wodurch die Wartezeit bei einem Materialwechsel verkürzt werden kann. Darüber hinaus kann durch geeignete Positionierung des Materialdetektors im Bereich der initialen Transportvorrichtung eine vollständige Entleerung des Aufgabetrichters bzw. eines der Aufgabetrichter verlässlich erkannt werden, sodass im Falle eines erforderlichen Wechsels der Zielkammer des Mehrkammersilos die erforderliche Nachlaufzeit bis zu einer Umstellung der finalen Transportvorrichtung präziser bestimmt werden kann. Die in beide Richtungen drehbare und reversierbare Verteileinrichtung ermöglicht eine Optimierung der für einen Wechsel der Zielkammer des Mehrkammersilos benötigte Zeit.These measures according to the invention can increase efficiency. On the one hand, the two feed hoppers can be alternately fed with aggregate, which means that the maximum conveying capacity of the transport system can be used more fully in practice and the waiting time when changing materials can be shortened. In addition, by appropriately positioning the material detector in the area of the initial transport device, complete emptying of the feed hopper or one of the feed hoppers can be reliably detected, so that if the target chamber of the multi-chamber silo needs to be changed, the required follow-up time until the final transport device is changed can be determined more precisely. The distribution device, which can be rotated and reversible in both directions, enables the time required to change the target chamber of the multi-chamber silo to be optimized.

Bei der zentralen Transportvorrichtung handelt es sich vorzugsweise um ein Becherwerk. In einer Ausführungsform kann vorgesehen sein, dass die zentrale Transportvorrichtung und das Transportsystem insgesamt eine Förderleistung von größer 200 m3/h, insbesondere von größer 300 m3/h aufweisen. Selbstverständlich sind aber auch Ausführungsformen mit geringeren Förderleistungen möglich.The central transport device is preferably a bucket elevator. In one embodiment, it can be provided that the central transport device and the transport system as a whole have a conveying capacity of more than 200 m 3 /h, in particular greater than 300 m 3 /h. Of course, designs with lower conveying capacities are also possible.

Weiterhin ist bei der Erfindung nach Anspruch 1 vorgesehen, dass die initiale Transportvorrichtung einen Gurtförderer aufweist und der Gurtförderer zum Transport von Gesteinskörnung aus den mindestens zwei Aufgabetrichtern ausgebildet ist.Furthermore, the invention according to claim 1 provides that the initial transport device has a belt conveyor and the belt conveyor is designed to transport aggregate from the at least two feed hoppers.

Gemäß der vorliegenden Erfindung weist die initiale Transportvorrichtung mindestens zwei Übergabeeinrichtungen auf, um Gesteinskörnung aus den Ausgängen beider Aufgabetrichter auf Gurtförderer zu fördern. Bevorzugt ist dabei, dass die beiden Übergabeeinrichtungen individuell angesteuert werden können. Vorzugsweise handelt es sich bei den Übergabeeinrichtungen um Vibrationsrinnen. Sofern beispielsweise nur einer der Aufgabetrichter befüllt ist, kann eine stärkere Vibration und mithin höhere Förderleistung an der zugeordneten Vibrationsrinne angewählt werden, als wenn beide Aufgabetrichter befüllt sind. So kann unabhängig davon, ob einer oder beide Aufgabetrichter vollständig befüllt sind, die die maximale Förderleistung des Transportsystems möglichst vollständig ausgenützt werden.According to the present invention, the initial transport device has at least two transfer devices in order to convey aggregate from the outlets of both feed hoppers onto belt conveyors. It is preferred that the two transfer devices can be controlled individually. The transfer devices are preferably vibrating chutes. If, for example, only one of the feed hoppers is full, a stronger vibration and thus a higher conveying capacity can be selected on the associated vibrating chute than if both feed hoppers are full. In this way, regardless of whether one or both feed hoppers are completely full, the maximum conveying capacity of the transport system can be used as fully as possible.

Gemäß der vorliegenden Erfindung nach Anspruch 1 ist vorgesehen, dass der Materialdetektor am Gurtförderer im Bereich der mindestens zwei Übergabeeinrichtungen, insbesondere in Förderrichtung direkt nach den mindestens zwei Übergabeeinrichtungen, angeordnet ist. Der Materialdetektor kann oberhalb des Gurtförderers angeordnet sein. Eine derartige Positionierung hat sich als besonders vorteilhaft erwiesen. Insbesondere können mindestens zwei individuelle Materialdetektoren vorgesehen sein, wobei je einer der Materialdetektoren einem der Aufgabetrichter zugeordnet ist. Jeder der Materialdetektoren ist dabei insbesondere im Bereich des Gurtförderers (vorzugsweise oberhalb des Gurtförderers) und jeweils direkt nach der jeweiligen Übergabeeinrichtung des zugeordneten Aufgabetrichters angeordnet. So kann eine Entleerung jedes Aufgabetrichters individuell festgestellt werden.According to the present invention according to claim 1, it is provided that the material detector is arranged on the belt conveyor in the area of the at least two transfer devices, in particular in the conveying direction directly after the at least two transfer devices. The material detector can be arranged above the belt conveyor. Such positioning has proven to be particularly advantageous. In particular, at least two individual material detectors can be provided, with one of the material detectors being assigned to each of the feed hoppers. Each of the material detectors is arranged in particular in the area of the belt conveyor (preferably above the belt conveyor) and directly after the respective transfer device of the assigned feed hopper. In this way, emptying of each feed hopper can be determined individually.

In einer typischen Ausführungsform weist die finale Transportvorrichtung ein Fördermittel, beispielsweise ein Stichband, auf, um Gesteinskörnung von der zentralen Transportvorrichtung auf die Verteileinrichtung zu fördern. Die zentrale und die finale Transportvorrichtung können Teil eines S-Förderers sein.In a typical embodiment, the final transport device comprises a conveyor, for example a stub belt, to transport aggregate from the central transport device to the distribution device. The central and final transport devices can be part of an S-conveyor.

In einer Variante der Erfindung ist vorgesehen, dass die Abschnitte der Verteileinrichtung, die sich ausgehend von dem Bereich, durch den seine vertikale Drehachse verläuft, in gegenüberliegende Richtungen erstrecken, gleich lang sind. Die vertikale Drehachse erstreckt sich also durch die Mitte der Verteileinrichtung. Das Fördermittel, insbesondere Stichband, entleert die Gesteinskörnung vorzugsweise in diesem Bereich auf die Verteileinrichtung.In a variant of the invention, it is provided that the sections of the distribution device which extend in opposite directions starting from the area through which its vertical axis of rotation runs are of equal length. The vertical axis of rotation therefore extends through the middle of the distribution device. The conveying means, in particular the stub belt, empties the aggregate onto the distribution device preferably in this area.

Weiterhin kann vorgesehen sein, dass die Beschickungseinrichtung eine Lesevorrichtung zum automatischen Einlesen von Informationen zu einer am Aufgabetrichter aufzugebenden Gesteinskörnung aufweist. Beispielsweise kann die Lesevorrichtung ausgebildet sein, um QR-Codes, RFID-Tags oder andere elektronisch generierte Labels automatisch einzulesen. Eine Steuereinheit der Beschickungseinrichtung kann die eingelesenen Informationen dazu verwenden, im Mehrkammersilo eine bestimmte Zielkammer für das Material festzulegen.Furthermore, it can be provided that the feeding device has a reading device for automatically reading information about an aggregate to be fed into the feed hopper. For example, the reading device can be designed to automatically read QR codes, RFID tags or other electronically generated labels. A control unit of the feeding device can use the read information to determine a specific target chamber for the material in the multi-chamber silo.

Erfindungsgemäß weist die Beschickungseinrichtung eine Steuereinheit auf, die ausgebildet ist, anhand eines Signals des Materialdetektors eine vollständige Entleerung eines Aufgabetrichters zu erkennen, eine Nachlaufzeit zu ermitteln und nach Ablauf der Nachlaufzeit eine Neueinstellung der Verteileinrichtung einzuleiten, wobei im Rahmen der Neueinstellung der Verteileinrichtung die Drehrichtung der Verteileinrichtung um die Vertikalachse und die Förderrichtung der Verteileinrichtung unter Berücksichtigung der Ist- und der Soll-Position so festgelegt werden, dass der erforderliche Drehwinkel um die Vertikalachse minimal ist.According to the invention, the feeding device has a control unit which is designed to detect a complete emptying of a feed hopper on the basis of a signal from the material detector, to determine a follow-up time and, after the follow-up time has elapsed, to initiate a readjustment of the distribution device, wherein, as part of the readjustment of the distribution device, the direction of rotation of the distribution device about the vertical axis and the conveying direction of the distribution device are determined taking into account the actual and the target position in such a way that the required angle of rotation about the vertical axis is minimal.

Unter Berücksichtigung der Positionierzeit der Verteileinrichtung bzw. des Drehverteilerbands kann dann der nächste Entleervorgang gestartet werden.The next emptying process can then be started, taking into account the positioning time of the distribution device or the rotary distribution belt.

Die Erfindung betrifft weiterhin eine Betonmischanlage mit einem Mehrkammersilo und einer erfindungsgemäßen Beschickungseinrichtung. Die Mischanlage umfasst typischerweise ferner ein Mischwerk, um im Silo gelagerte Gesteinskörnungen mit Zement, das in einem separaten Silo oder Behälter der Mischanlage vorgehalten werden kann, und Wasser zu Beton zu vermischen. Der so hergestellte Frischbeton kann dann an einer Abgabevorrichtung der Mischanlage an einen Fahrmischer abgegeben werden.The invention further relates to a concrete mixing plant with a multi-chamber silo and a feeding device according to the invention. The mixing plant typically also comprises a mixer for mixing aggregates stored in the silo with Cement, which can be kept in a separate silo or container in the mixing plant, and water are mixed to form concrete. The fresh concrete produced in this way can then be delivered to a truck mixer via a delivery device in the mixing plant.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus dem nachfolgend anhand der Figuren beschriebenen Ausführungsbeispiel. In den Figuren zeigen:

Figur 1:
eine Seitenansicht einer erfindungsgemäßen Betonmischanlage; und
Figur 2:
eine Draufsicht dieser Betonmischanlage.
Further details and advantages of the invention emerge from the embodiment described below with reference to the figures. In the figures:
Figure 1:
a side view of a concrete mixing plant according to the invention; and
Figure 2:
a top view of this concrete mixing plant.

Die gezeigte Betonmischanlage der vorliegenden Erfindung umfasst zwei voneinander getrennte Aufgabetrichter 1 und 2 zur Aufgabe einer Gesteinskörnung, deren Ausgänge mit je einer als Vibrationsrinne ausgebildeten Übergabeeinrichtung 3 gekoppelt sind. Die Vibrationsrinnen 3 können unabhängig voneinander angesteuert werden und dienen zur gleichmäßigen Befüllung des vertikalen Becherwerks 6 über einen Gurtförderer 4, der am Einlauf 7 des Becherwerks 6 endet.The concrete mixing plant of the present invention shown comprises two separate feed hoppers 1 and 2 for feeding an aggregate, the outlets of which are each coupled to a transfer device 3 designed as a vibrating chute. The vibrating chutes 3 can be controlled independently of one another and serve to evenly fill the vertical bucket elevator 6 via a belt conveyor 4, which ends at the inlet 7 of the bucket elevator 6.

An einen Auslauf 8 des Becherwerks 6 schließen sich ein als Stichband ausgebildetes Fördermittel 9 und eine als Drehverteilerband ausgebildete Verteileinrichtung 10 an, um die Gesteinskörnung in eine der Kammern 12 des Mehrkammer-Gesteinssilos 11 zu transportieren. In jeder Kammer 12 befindet sich ein kontinuierlicher Füllmelder 13.An outlet 8 of the bucket elevator 6 is followed by a conveyor 9 designed as a branch belt and a distribution device 10 designed as a rotary distribution belt in order to transport the aggregate into one of the chambers 12 of the multi-chamber aggregate silo 11. In each chamber 12 there is a continuous filling indicator 13.

Anstelle der Anordnung von Gurtförderer 4, Becherwerk 6 und Stichband 9 können auch andere Fördereinrichtungen vorgesehen sein, beispielsweise ein einzelner Gurtförderer oder ein S-Förderer.Instead of the arrangement of belt conveyor 4, bucket elevator 6 and stitch belt 9, other conveying devices can also be provided, for example a single belt conveyor or an S-conveyor.

Oberhalb des Gurtförderers 4 befinden sich zwei als Materialtaster ausgebildete Materialdetektoren 5, von denen jeder an einen der Aufgabetrichter 1 bzw. 2 gekoppelt ist. Die Materialtaster 5 signalisieren im Betrieb einer nicht dargestellten Steuereinheit, wenn ein Aufgabetrichter 1 bzw. 2 komplett leer ist, um im Falle eines Materialwechsels den Beginn einer notwendigen Nachlaufzeit zu markieren. Bei der Bestimmung der Nachlaufzeit berücksichtigt die Steuereinheit die Zeit, die für einen Materialtransport der Gesteinskörnung von der Vibrationsrinne 3 über den Gurtförderer 4, das Becherwerk 6, das Stichband 9 und das Drehverteilerband 10 in die Silokammer 12 des Gesteinssilos 11 benötigt wird. Durch geeignete Positionierung der Materialtaster 5 in Abhängigkeit von der Förderbandgeschwindigkeit und der Förderstrecke kann die Nachlaufzeit optimal verkürzt werden.Above the belt conveyor 4 there are two material detectors 5 designed as material sensors, each of which is coupled to one of the feed hoppers 1 or 2. The material sensors 5 signal a control unit (not shown) during operation, when a feed hopper 1 or 2 is completely empty, in order to mark the beginning of a necessary run-on time in the event of a material change. When determining the run-on time, the control unit takes into account the time required for material transport of the aggregate from the vibrating chute 3 via the belt conveyor 4, the bucket elevator 6, the stub belt 9 and the rotary distributor belt 10 into the silo chamber 12 of the rock silo 11. The run-on time can be optimally shortened by appropriate positioning of the material sensors 5 depending on the conveyor belt speed and the conveyor distance.

Um die im Mittel erforderlichen Schwenkzeiten des Drehverteilerbandes 10 bei der Positionierung zu einer anderen Silokammer 12 zu minimieren, wird ein mit Blick auf die (horizontale) Förderrichtung des Bandes reversierbares und in beide Richtungen (Uhrzeigersinn und Gegenuhrzeigersinn) um eine Vertikalachse drehbares Drehverteilerband eingesetzt.In order to minimize the average pivoting times required for the rotary distributor belt 10 when positioning it to another silo chamber 12, a rotary distributor belt is used that is reversible with respect to the (horizontal) conveying direction of the belt and can be rotated in both directions (clockwise and counterclockwise) about a vertical axis.

Die Auswahl der Silokammer 12 erfolgt über Positionsschalter. Durch Einlesen des Lieferscheins (z.B. QR-Code) kann eine Fehlereingabe bei der Kammerauswahl verhindert werden.The silo chamber 12 is selected using position switches. By reading the delivery note (e.g. QR code), an error in the chamber selection can be prevented.

Die Beschickung des Silos 11 dieser Betonmischanlage kann wie folgt erfolgen.The silo 11 of this concrete mixing plant can be fed as follows.

Ein LKW-Fahrer fährt an die Anlage und wählt entweder manuell die Silokammer 12 (z.B. Kammer 1) an einer Steuerung vor, oder es wird automatisch ein Lieferschein z.B. mittels QR-Code eingelesen. Die eingelesenen Informationen enthalten Angaben über die Menge an Gesteinskörnung und über die Gesteinsart. Daraus ermittelt die Steuerung der Anlage die korrekte Silokammer 12.A truck driver drives to the system and either manually selects silo chamber 12 (e.g. chamber 1) on a control system, or a delivery note is automatically read in, e.g. using a QR code. The information read in contains details about the amount of aggregate and the type of rock. From this, the system's control system determines the correct silo chamber 12.

Die Steuerung der Anlage überprüft anhand der Lieferdaten oder der manuellen Eingabe sodann, ob das Fassungsvermögen der Kammer für die Liefermenge ausreicht. Die entsprechenden Informationen zum momentanen Füllstand empfängt sie vom Füllmelder 13. Optional kann auch eine visuelle Überprüfung über eine geeignete Anzeige wie beispielsweise eine LED-Anzeige erfolgen.The system control then uses the delivery data or manual input to check whether the chamber capacity is sufficient for the delivery quantity. It receives the relevant information on the current fill level from the fill indicator 13. Optionally, a visual check can also be carried out using a suitable display such as an LED display.

Sofern in einem beispielhaften Szenario der Aufgabetrichter 1 gerade befüllt wurde und aktuell entleert wird, muss der LKW-Fahrer nun seine Ladung in den Aufgabetrichter 2 entladen.If, in an example scenario, the feed hopper 1 has just been filled and is currently being emptied, the truck driver must now unload his load into the feed hopper 2.

Sobald der Aufgabetrichter 1 dann leer meldet, was anhand des diesem Aufgabetrichter zugeordneten Materialtasters erfolgt, wird eine Nachlaufzeit abgewartet, bevor das Drehverteilerband 10 neu positioniert wird. Während der Nachlaufzeit kann bereits die Entleerung des Aufgabetrichters 2 anlaufen.As soon as the feed hopper 1 reports that it is empty, which is done using the material sensor assigned to this feed hopper, a follow-up time is waited for before the rotary distributor belt 10 is repositioned. During the follow-up time, the emptying of the feed hopper 2 can already begin.

Für die Neupositionierung des Drehverteilerbandes 10 erkennt die Steuerung die schnellstmögliche Positionsänderung, um das Drehverteilerband 10 von einer Ist- zu einer Soll-Position für die Beschickung der neuen Silokammerammer 12 zu bewegen, woraufhin die Drehrichtung des Drehverteilerbandes 10 um eine Vertikalachse (Uhrzeigersinn oder Gegenuhrzeigersinn) und die neue Förderrichtung des Drehverteilerbandes festgelegt. Das Drehverteilerband wird entsprechend neu positioniert.To reposition the rotary distributor belt 10, the control system detects the fastest possible position change to move the rotary distributor belt 10 from an actual position to a target position for feeding the new silo chamber 12, whereupon the direction of rotation of the rotary distributor belt 10 about a vertical axis (clockwise or counterclockwise) and the new conveying direction of the rotary distributor belt are determined. The rotary distributor belt is repositioned accordingly.

Während der Aufgabetrichter 2 entleert wird, kann bereits zeitgleich der Aufgabetrichter 1 wieder neu befüllt werden, um einen neuen Zyklus zu beginnen.While the feed hopper 2 is being emptied, the feed hopper 1 can be refilled at the same time to start a new cycle.

Claims (7)

  1. Filling device for a concrete mixing plant having a feed hopper (1, 2) for an aggregate and a multi-part transport system for conveying the aggregate from an outlet of the feed hopper (1, 2) to an inlet of a multi-chamber silo (11), wherein the multi-part transport system comprises an initial transport device, a central transport device and a final transport device in a staggered arrangement, wherein the filling device has at least two feed hoppers (1, 2) and the initial transport device is designed to convey aggregate from the outlets of the at least two feed hoppers (1, 2) in the direction of the central transport device; wherein the filling device has a material detector (5) in the area of the initial transport device for recognising complete emptying of the at least two feed hoppers (1, 2); wherein the initial transport device has a belt conveyor (4), wherein the initial transport device has at least two transfer devices (3), and wherein the material detector (5) is arranged on the belt conveyor (4) in the area of the at least two transfer devices (3), in particular in the conveying direction directly after the at least two transfer devices;
    characterised in that
    the final transport device has a distribution device (10) that can be rotated clockwise and anti-clockwise about a vertical axis and can be reversed; and in that
    the filling device has a control unit designed to recognise a complete emptying of a feed hopper (1, 2) by means of a signal from the material sensor (5), to determine a run-on time, and to initiate a readjustment of the distribution device after the run-on time has elapsed, wherein the direction of rotation of the distribution device (10) about the vertical axis and the conveying direction of the distribution device (10) are determined as part of the readjustment of the distribution device (10), taking into account the actual position and the target position, such that the required angle of rotation about the vertical axis is minimised.
  2. Filling device according to claim 1, characterised in that the at least two transfer devices are in particular vibrating chutes (3) for conveying aggregate from the outlets of the at least two feed hoppers (1, 2) onto belt conveyors (4), wherein it is provided that the transfer devices (3) can be controlled individually.
  3. Filling device according to either one of the preceding claims, characterised in that at least two individual material detectors (5) are provided, wherein each of the material detectors (5) is assigned to one of the feed hoppers (1, 2).
  4. Filling device according to any one of the preceding claims, characterised in that the final transport device has conveying means, in particular a branch conveyor belt (9) to convey aggregate from the central transport device to the distribution device (10).
  5. Filling device according to any one of the preceding claims, characterised in that the sections of the distribution device (10), which extend in opposite directions starting from the area through which its vertical axis of rotation runs, are of equal length.
  6. Filling device according to any one of the preceding claims, characterised in that the filling device has a reading device for automatically reading in information on an aggregate to be fed into the feed hopper (1, 2).
  7. Concrete mixing plant having a multi-chamber silo and a filling device according to any one of the preceding claims.
EP21204194.1A 2020-12-22 2021-10-22 Filling device for a concrete mixing plant Active EP4019218B1 (en)

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DE3102612C2 (en) 1981-01-27 1984-03-08 Liebherr-Mischtechnik GmbH, 7953 Bad Schussenried Method and control device for emptying the mixing container of a dosing and mixing system
JP2838621B2 (en) * 1992-07-13 1998-12-16 日工株式会社 Material supply control method for concrete manufacturing plant
DE4322591A1 (en) 1993-04-15 1994-10-20 Eirich Maschf Gustav Method and device for volumetric dosing of flowable substances
DE19901904A1 (en) * 1999-01-19 2000-07-20 Heilit & Woerner Bau Ag Transportable concrete mixing station has a modular construction which packs into standard containers and which uses the containers as building modules
CN108381781A (en) * 2018-01-31 2018-08-10 广西路桥工程集团有限公司 Mixing plant raw material cabin automatical feeding system
CN109465966A (en) * 2018-11-13 2019-03-15 深圳市深海绿色智能装备有限公司 A kind of intelligence concrete batching and mixing tower
CN210820236U (en) * 2019-08-13 2020-06-23 杭州江河机电装备工程有限公司 Aggregate feeding system of mixing station

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