EP3412369A1 - Transport concrete mixer and method for its operation - Google Patents

Transport concrete mixer and method for its operation Download PDF

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Publication number
EP3412369A1
EP3412369A1 EP18176299.8A EP18176299A EP3412369A1 EP 3412369 A1 EP3412369 A1 EP 3412369A1 EP 18176299 A EP18176299 A EP 18176299A EP 3412369 A1 EP3412369 A1 EP 3412369A1
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EP
European Patent Office
Prior art keywords
water
cleaning
drum
mixing drum
hose
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Granted
Application number
EP18176299.8A
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German (de)
French (fr)
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EP3412369B1 (en
Inventor
Günther Lembacher
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Betonlogistik Niederoesterreich GmbH
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Betonlogistik Niederosterreich GmbH
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Publication of EP3412369A1 publication Critical patent/EP3412369A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
    • B08B9/0813—Cleaning containers having tubular shape, e.g. casks, barrels, drums by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4231—Proportioning or supplying water

Definitions

  • the present invention relates to a ready mix concrete mixer with a rotary drum for driving the concrete, a water tank, a water meter, a water pipe to the mixing drum and a water hose for cleaning the mixing drum and the chute, the water meter independently by the water line the water supplied to the mixing drum and the water taken over the water hose measures, and wherein a switch for switching on the water discharge is provided by the water hose. It further relates to a method for operating such a ready mixed concrete mixer.
  • ready-mixed concrete mixers are not emptied completely when they return from the construction site to the concrete plant, but are immediately refilled with fresh concrete. In particular, if only a residual amount of eg 1 m 3 of concrete is filled, but inadmissibly much residual water affects significantly.
  • a ready mixed concrete mixer of the type mentioned in the present invention that the switch to turn on the water through the water hose two positions "on", namely one for the drum cleaning and one for the slide cleaning and the drum outer cleaning, and that after emptying the mixing drum either only the water output is detected by the water hose for cleaning the inside of the drum, or that the water discharge through the water hose for the chute cleaning and the drum external cleaning is also detected and these values are transmitted to a central station.
  • the amount of water added to the drum can be accurately detected and the amount of water in the drum at the next filling be taken into account, so that even by the residual water no concrete deterioration occurs.
  • the driver is prompted to emptying the residue if the amount of residual water determined by the measured values is already too high to be taken into account in the next filling, which will often be the case in particular when only little concrete is charged during the next filling shall be.
  • the driver will also be asked to empty the water in the concrete plant, because there is a suspicion that the switch was operated incorrectly and therefore it is not clear how much water is in the mixing drum and how much water is needed to clean the chute or the outside of the mixing drum was used.
  • the water meter is heatable, so that even in winter reliable values can be obtained, i. the temperature coefficient does not affect or hardly affects due to the heating.
  • a flow rate control valve is preferably provided before or after the water meter.
  • electronic flowmeters work well only in a certain range of flow, and the flow control valve ensures that this area is not left.
  • a flow rate of 130 l / min is typical.
  • a consistency measuring device is mounted in the mixing drum.
  • a suitable consistency measuring device is in the DE 102012017445 A described. It includes a rod which projects normal to the wall of the mixing drum into the interior of the mixing drum and is subjected to bending by the concrete. The forces arising from the bending load can be measured, and thus one can conclude on the consistency of the concrete, as described in detail in the cited document. This is much more accurate than if one concludes on the basis of the torque required for the drive on the consistency, as from the already mentioned DE 3310570 A is known.
  • Such a consistency measuring device it can be provided according to an embodiment of the invention during operation of the ready mixed concrete mixer that the consistency of the concrete is measured after the next filling and compared with a desired value to detect an inadmissible addition of water.
  • the single drawing shows a schematic diagram of a ready-mixed concrete mixer according to the invention.
  • the ready mixed concrete mixer is essentially only the mixing drum 11, the chute 23 and the water tank 12 shown.
  • this line 15 is a flow rate control valve 13, which ensures a flow rate of about 130 l / min, and a water meter 14.
  • the water meter 14 is heated by a heater 24.
  • a valve 18 is provided. If this is opened, which can happen automatically or can be triggered by the driver, water is added directly into the mixing drum 11. A certain amount of water is normally added just before unloading, and then the drum is rotated several turns (so-called “mixing up”) several times.
  • Another line 17 leads to a water hose 21, at the end of which a nozzle 22 is provided.
  • a valve 19 is provided, which can be opened and closed by means of a switch 20.
  • this switch 20 has two positions “on”, namely a position "outside” for the cleaning of the chute 23 and the mixing drum 11 outside and a position "inside” for the cleaning of the mixing drum 11 inside.
  • the water meter 14 not only takes into account whether the valve 18 or the valve 19 is open, but also in which position the switch 20 is. In this way, it can be accurately detected how much water after emptying the mixing drum 11 due to the cleaning is in the mixing drum 11.
  • the amount detected by the water meter 14 is set to zero when the mixing drum 11 rotates at least four times in the opposite direction. As a result, the entire water content is given off (so-called emptying of the residue). Normally, the emptying takes place on the site of the concrete supplier and is thus known to him; However, it is conceivable that a residue emptying takes place on the construction site, and also in this case the correct amount of water (namely zero) is reported.
  • the amount of water added before discharge can be detected (regardless of whether the addition of water is made directly through the water pipe 16 or the water hose 21), but also the amount of water after being discharged in the mixing drum 11 remains. In this way, this amount of water can be taken into account at the next loading, so that even with this the water content is set exactly without the vehicle must be previously emptied before.
  • the emptying of residues may only be carried out in special recycling plants, and these only have a limited capacity. It is therefore advantageous to be able to keep the number of emptying of residues low.
  • the vehicle also contains an evaluation and transmission unit which transmits the measured values to a control center, for example via the mobile phone network.
  • the drivers can be equipped with a tablet, with which they can log in at the headquarters and read out the values that affect their vehicle. Thus, the drivers are always supplied with the current values.
  • a consistency meter 29 in the form of a rod which projects normal to the wall of the mixing drum 11 in the interior of the mixing drum 11 and is loaded by the concrete to bending.
  • the forces occurring due to the bending load are measured by strain gauges.
  • the consistency meter includes Furthermore, an acceleration sensor, so that the angular position of the drum is detected. In this way you can detect the speed, as the angular position repeats after exactly one revolution.
  • An evaluation circuit which is preferably mounted on the outside of the mixing drum 11, can now calculate the consistency from the rotational speed and the measured values of the strain gauges.
  • the measured values are transmitted wirelessly to the evaluation and transmission unit and transmitted by the latter together with other measured values (water quantities, GPS position, temperature) to the control center.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

Transportbetonmischer mit Mischtrommel (11), Rutsche (23) zur Abgabe des Betons, Wasserbehälter (12), Wasserzähler (14), Wasserleitung (16) zur Mischtrommel (11) sowie Wasserschlauch (21) zum Reinigen der Mischtrommel (11) und der Rutsche (23). Der Wasserzähler (14) misst unabhängig voneinander das durch die Wasserleitung zugeführte Wasser und das über den Wasserschlauch (21) entnommene Wasser. Dabei hat der Schalter (20) zum Einschalten der Wasserabgabe durch den Wasserschlauch (21) zwei Stellungen "ein", eine Stellung "innen" für die Trommelinnenreinigung und eine Stellung "außen" für die Rutschenreinigung und die Trommelaußenreinigung, und es wird nach dem Entleeren der Mischtrommel (11) zumindest die Wasserabgabe durch den Wasserschlauch (21) in der Stellung "innen" erfasst und an eine Zentrale übermittelt.Transport concrete mixer with mixing drum (11), chute (23) for discharging the concrete, water tank (12), water meter (14), water pipe (16) to the mixing drum (11) and water hose (21) for cleaning the mixing drum (11) and the chute (23). The water meter (14) independently measures the water supplied through the water pipe and the water taken out via the water hose (21). In this case, the switch (20) for switching on the water delivery through the water hose (21) has two positions "on", a position "inside" for the drum interior cleaning and an "outside" position for the slide cleaning and the drum outer cleaning, and it will after emptying the mixing drum (11) detects at least the water delivery through the water hose (21) in the position "inside" and transmitted to a central office.

Description

Technisches GebietTechnical area

Die vorliegende Erfindung betrifft einen Transportbetonmischer mit einer zum Drehen antreibbaren Mischtrommel, einer Rutsche zur Abgabe des Betons, einem Wasserbehälter, einem Wasserzähler, einer Wasserleitung zur Mischtrommel sowie einem Wasserschlauch zum Reinigen der Mischtrommel und der Rutsche, wobei der Wasserzähler unabhängig voneinander das durch die Wasserleitung der Mischtrommel zugeführte Wasser und das über den Wasserschlauch entnommene Wasser misst, und wobei ein Schalter zum Einschalten der Wasserabgabe durch den Wasserschlauch vorgesehen ist. Sie betrifft weiters ein Verfahren zum Betrieb solch eines Transportbetonmischers.The present invention relates to a ready mix concrete mixer with a rotary drum for driving the concrete, a water tank, a water meter, a water pipe to the mixing drum and a water hose for cleaning the mixing drum and the chute, the water meter independently by the water line the water supplied to the mixing drum and the water taken over the water hose measures, and wherein a switch for switching on the water discharge is provided by the water hose. It further relates to a method for operating such a ready mixed concrete mixer.

Stand der TechnikState of the art

Beton verliert bei einem zu hohen Wassergehalt an Endfestigkeit. Dennoch kommt es immer wieder vor, dass unbefugt Wasser zugegeben wird, um die Fließfähigkeit des noch flüssigen Betons zu verbessern. Es gibt daher bereits Systeme, mit denen eine unbefugte Wasserzugabe verhindert oder zumindest nachgewiesen werden kann, sodass der Betonlieferant Schadensersatzforderungen abwenden kann.Concrete loses its final strength if the water content is too high. However, it happens again and again that water is added without authorization to improve the flowability of the still liquid concrete. Therefore, there are already systems that can prevent or at least prove unauthorized addition of water, so that the concrete supplier can avert claims for damages.

So ist aus DE 3310570 A bekannt, das Antriebsmoment der Mischtrommel zu messen. Nur wenn dieses ausreichend hoch ist (der Beton also nicht zu fließfähig ist), kann Wasser zugegeben werden.That's how it is DE 3310570 A known to measure the drive torque of the mixing drum. Only if this is sufficiently high (ie the concrete is not too fluid) can water be added.

Aus GB 2388055 A ist bekannt, einen Wasserzähler vorzusehen, der immer dann ein Alarmsignal auslöst, wenn Wasser entnommen wird und die Trommel entweder stillsteht oder mischt (also nur dann nicht, wenn die Trommel durch Drehen in die Gegenrichtung entleert wird).Out GB 2388055 A It is known to provide a water meter which triggers an alarm signal whenever water is removed and the drum either stops or mixes (ie not only when the drum is deflated by rotating in the opposite direction).

Aus US 6484079 B ist bekannt, zahlreiche Messdaten zu erfassen, insbesondere die der Trommel über die Wasserleitung zugegebene Wassermenge, getrennt nach automatischer und manueller Zugabe (Sp. 8, Z 52-61).Out US 6484079 B It is known to record numerous measurement data, in particular the amount of water added to the drum via the water line, separated after automatic and manual addition (column 8, lines 52-61).

All diesen Verfahren ist gemeinsam, dass der Weg vom Beladen im Betonwerk bis zum Entladen auf der Baustelle überwacht wird.All these methods have in common that the way from loading in the concrete plant to unloading on the construction site is monitored.

Wie im Rahmen der vorliegenden Erfindung gefunden wurde, ist dies nicht ausreichend. Normalerweise werden nämlich Transportbetonmischer nicht restentleert, wenn sie von der Baustelle zum Betonwerk zurückkehren, sondern gleich wieder mit frischem Beton gefüllt. Insbesondere wenn nur eine Restmenge von z.B. 1 m3 Beton eingefüllt wird, wirkt sich aber unzulässig viel Restwasser deutlich aus.As found in the context of the present invention, this is not sufficient. Normally, ready-mixed concrete mixers are not emptied completely when they return from the construction site to the concrete plant, but are immediately refilled with fresh concrete. In particular, if only a residual amount of eg 1 m 3 of concrete is filled, but inadmissibly much residual water affects significantly.

Aus US 2017072916 A ist ein automatisches Reinigungssystem für Betonmischer bekannt, wobei geoffenbart ist, dass das in der Trommel nach der Reinigung verbleibende Restwasser bei der nächsten Beladung berücksichtigt wird. Der Nachteil aller bisher bekannter automatischer Reinigungssysteme ist jedoch, dass der Wasserverbrauch deutlich höher ist als bei manueller Reinigung. Bei der manuellen Reinigung sieht der Fahrer, welche Stellen mit Beton verschmutzt sind und reinigt nur diese, während bei der automatischen Reinigung immer alle Stellen gereinigt werden müssen. Daher befindet sich nach einer automatischen Reinigung meist mehr Wasser in der Trommel, als bei der nächsten Beladung berücksichtigt werden kann, sodass meist trotz dieser Erfassung restentleert werden muss. Bei der automatischen Reinigung müssen verschiedene Düsen für die Innenreinigung der Trommel, für die Außenreinigung der Trommel und für die Reinigung der Rutsche vorgesehen sein, sodass zwangsläufig bekannt ist, wo wieviel Wasser eingesetzt wird. Für die manuelle Reinigung ist aber nur ein einziger Schlauch vorgesehen, mit dem der Fahrer sowohl die Trommel (innen und außen) als auch die Rutsche reinigt. Somit ist es bei derzeitigen Systemen bei manueller Reinigung nicht möglich, die in der Trommel befindliche Wassermenge genau zu erfassen.Out US 2017072916 A An automatic cleaning system for concrete mixers is known, wherein it is disclosed that the residual water remaining in the drum after cleaning is taken into account at the next loading. The disadvantage of all previously known automatic cleaning systems, however, is that the water consumption is much higher than with manual cleaning. During manual cleaning, the driver sees which areas are contaminated with concrete and only cleans them, while during automatic cleaning all areas must always be cleaned. Therefore, after an automatic cleaning usually more water is in the drum, as can be considered in the next loading, so usually in spite of this detection must be emptied. Automatic cleaning requires different nozzles for cleaning the inside of the drum, cleaning the outside of the drum and cleaning the chute so that it is important to know where and how much water is being used. For manual cleaning, however, only a single hose is provided, with which the driver cleans both the drum (inside and outside) and the chute. Thus, with current manual cleaning systems, it is not possible to accurately detect the amount of water in the drum.

Kurzbeschreibung der ErfindungBrief description of the invention

Es ist Aufgabe der vorliegenden Erfindung, diese Lücke zu schließen.It is an object of the present invention to close this gap.

Diese Aufgabe wird durch einen Transportbetonmischer der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass der Schalter zum Einschalten der Wasserabgabe durch den Wasserschlauch zwei Stellungen "ein" aufweist, nämlich eine für die Trommelinnenreinigung und eine für die Rutschenreinigung und die Trommelaußenreinigung, und dass nach dem Entleeren der Mischtrommel entweder nur die Wasserabgabe durch den Wasserschlauch für die Trommelinnenreinigung erfasst wird oder dass auch die Wasserabgabe durch den Wasserschlauch für die Rutschenreinigung und die Trommelaußenreinigung erfasst wird und diese Werte an eine Zentrale übermittelt werden.This object is achieved by a ready mixed concrete mixer of the type mentioned in the present invention that the switch to turn on the water through the water hose two positions "on", namely one for the drum cleaning and one for the slide cleaning and the drum outer cleaning, and that after emptying the mixing drum either only the water output is detected by the water hose for cleaning the inside of the drum, or that the water discharge through the water hose for the chute cleaning and the drum external cleaning is also detected and these values are transmitted to a central station.

Auf diese Weise kann die der Trommel zugegebene Wassermenge präzise erfasst werden und die Menge Wasser in der Trommel bei der nächsten Befüllung berücksichtigt werden, sodass auch durch das Restwasser keine Betonverschlechterung eintritt.In this way, the amount of water added to the drum can be accurately detected and the amount of water in the drum at the next filling be taken into account, so that even by the residual water no concrete deterioration occurs.

Dies setzt zwar einen ehrlichen Fahrer voraus, der nur bei der Rutschenreinigung und der Außenreinigung der Mischtrommel die Stellung "außen" wählt und bei der Innenreinigung der Mischtrommel die Stellung "innen"; jedoch kann man bei Vorliegen von Verdachtsmomenten (wie einem unüblich hohen Wasserverbrauch zur Rutschenreinigung) jederzeit den Fahrer nach der Rückkehr von der Baustelle zum Restentleeren auffordern, wodurch eine falsche Betätigung des Schalters sofort nachgewiesen werden kann.Although this requires a honest driver who selects the position "outside" only when the slide cleaning and the external cleaning of the mixing drum and the internal cleaning of the mixing drum, the position "inside"; However, in the presence of suspicions (such as unusually high water consumption for chute cleaning) at any time on the return from the construction site to ask the driver to emptying, whereby a false operation of the switch can be immediately detected.

Somit ist der Betrieb des Transportbetonmischers erfindungsgemäß dadurch gekennzeichnet, dass nach dem Entleeren der Mischtrommel entweder nur die Wasserabgabe durch den Wasserschlauch für die Trommelinnenreinigung erfasst wird oder auch die Wasserabgabe durch den Wasserschlauch für die Rutschenreinigung und die Trommelaußenreinigung erfasst wird und diese Werte an eine Zentrale übermittelt werden, wobei der Fahrer nach Rückkehr von der Baustelle

  1. a) manchmal zur Restentleerung aufgefordert wird und dann die entleerte Menge mit den übermittelten Werten verglichen wird und wobei sonst
  2. b) die in der Mischtrommel befindliche Wassermenge bei der nächsten Befüllung berücksichtigt wird.
Thus, the operation of the ready mixed concrete mixer according to the invention is characterized in that after emptying the mixing drum either only the water output is detected by the water hose for the drum interior cleaning or the water output is detected by the water hose for the slide cleaning and the drum outer cleaning and transmits these values to a central office be, taking the driver to return from the construction site
  1. a) is sometimes asked for emptying and then the emptied amount is compared with the transmitted values and otherwise
  2. b) the amount of water in the mixing drum is taken into account at the next filling.

Der Fahrer wird jedenfalls dann zur Restentleerung aufgefordert, wenn die durch die Messwerte bestimmte Menge an Restwasser bereits zu hoch ist, um bei der nächsten Befüllung berücksichtigt zu werden, was insbesondere dann oft der Fall sein wird, wenn bei der nächsten Befüllung nur wenig Beton geladen werden soll. Insbesondere bei unüblich hohem Wasserverbrauch nach dem Entleeren auf der Baustelle von z.B. mehr als 40 l wird man den Fahrer aber auch auffordern, das Wasser im Betonwerk restzuentleeren, da dann der Verdacht besteht, dass der Schalter unrichtig betätigt wurde und somit nicht klar ist, wie viel Wasser sich in der Mischtrommel befindet und wie viel Wasser zum Reinigen der Rutsche bzw. der Außenseite der Mischtrommel verwendet wurde.In any case, the driver is prompted to emptying the residue if the amount of residual water determined by the measured values is already too high to be taken into account in the next filling, which will often be the case in particular when only little concrete is charged during the next filling shall be. Especially at unusually high water consumption after emptying on the site of eg more than However, the driver will also be asked to empty the water in the concrete plant, because there is a suspicion that the switch was operated incorrectly and therefore it is not clear how much water is in the mixing drum and how much water is needed to clean the chute or the outside of the mixing drum was used.

Vorzugsweise ist der Wasserzähler beheizbar, sodass auch im Winter zuverlässige Werte erhalten werden können, d.h. der Temperaturgang wirkt sich infolge der Heizung nicht oder nur kaum aus.Preferably, the water meter is heatable, so that even in winter reliable values can be obtained, i. the temperature coefficient does not affect or hardly affects due to the heating.

Weiters ist vorzugsweise vor oder nach dem Wasserzähler ein Durchflussmengenregelventil vorgesehen. Elektronische Durchflussmengenmesser funktionieren nämlich nur in einem gewissen Bereich von Durchfluss genau, und durch das Durchflussmengenregelventil wird sichergestellt, dass dieser Bereich nicht verlassen wird. Bei der erfindungsgemäßen Anwendung ist ein Durchfluss von 130 l/min typisch.Furthermore, a flow rate control valve is preferably provided before or after the water meter. In fact, electronic flowmeters work well only in a certain range of flow, and the flow control valve ensures that this area is not left. In the application according to the invention, a flow rate of 130 l / min is typical.

Nach einer Ausgestaltung der Erfindung ist vorgesehen, dass in der Mischtrommel eine Konsistenzmesseinrichtung angebracht ist. Eine geeignete Konsistenzmesseinrichtung ist in der DE 102012017445 A beschrieben. Sie beinhaltet einen Stab, der normal zur Wand der Mischtrommel in das Innere der Mischtrommel ragt und durch den Beton auf Biegung belastet wird. Die durch die Biegebelastung auftretenden Kräfte lassen sich messen, und dadurch kann man auf die Konsistenz des Betons rückschließen, wie dies in der genannten Schrift ausführlich beschrieben ist. Dies ist wesentlich genauer, als wenn man auf Grund des für den Antrieb benötigten Drehmoments auf die Konsistenz schließt, wie dies aus der bereits erwähnten DE 3310570 A bekannt ist.According to one embodiment of the invention it is provided that a consistency measuring device is mounted in the mixing drum. A suitable consistency measuring device is in the DE 102012017445 A described. It includes a rod which projects normal to the wall of the mixing drum into the interior of the mixing drum and is subjected to bending by the concrete. The forces arising from the bending load can be measured, and thus one can conclude on the consistency of the concrete, as described in detail in the cited document. This is much more accurate than if one concludes on the basis of the torque required for the drive on the consistency, as from the already mentioned DE 3310570 A is known.

Wenn solch eine Konsistenzmesseinrichtung vorgesehen ist, kann man nach einer Ausgestaltung der Erfindung beim Betrieb des Transportbetonmischers vorsehen, dass zur Erkennung einer unzulässigen Wasserbeimengung die Konsistenz des Betons nach der nächsten Befüllung gemessen und mit einem Sollwert verglichen wird.If such a consistency measuring device is provided, it can be provided according to an embodiment of the invention during operation of the ready mixed concrete mixer that the consistency of the concrete is measured after the next filling and compared with a desired value to detect an inadmissible addition of water.

Auf diese Weise kann also nicht eine einzige Fuhr mit qualitativ minderwertigem (weil "gewässertem") Beton übersehen werden. Nach jeder Beladung wird geprüft, ob die Betonkonsistenz stimmt, was nur dann der Fall ist, wenn die korrekte Menge Restwasser gemeldet und bei der nächsten Beladung auch korrekt berücksichtigt wurde.In this way, not a single truck can be overlooked with poor quality (because "watered") concrete. To Each load is checked whether the concrete consistency is correct, which is only the case when the correct amount of residual water has been reported and correctly taken into account at the next loading.

Kurze Beschreibung der ZeichnungsfigurenShort description of the drawing figures

Anhand der beiliegenden Zeichnung wird die vorliegende Erfindung näher erläutert. Die einzige Zeichnung zeigt eine Prinzipskizze eines erfindungsgemäßen Transportbetonmischers.Reference to the accompanying drawings, the present invention will be explained in more detail. The single drawing shows a schematic diagram of a ready-mixed concrete mixer according to the invention.

Beschreibung der AusführungsartenDescription of the embodiments

Von dem Transportbetonmischer ist im Wesentlichen nur die Mischtrommel 11, die Rutsche 23 und der Wasserbehälter 12 dargestellt. Der Wasserbehälter 12, der unter Überdruck steht, kann über eine Leitung 15 Wasser abgeben. In dieser Leitung 15 befindet sich ein Durchflussmengenregelventil 13, welches einen Durchfluss von etwa 130 l/min sicherstellt, und ein Wasserzähler 14. Der Wasserzähler 14 ist durch eine Heizung 24 beheizbar. Hinter dem Wasserzähler 14 verzweigt die Leitung 15 in eine Wasserleitung 16, die direkt in das Innere der Mischtrommel 11 führt. In dieser Wasserleitung 16 ist ein Ventil 18 vorgesehen. Wenn dieses geöffnet wird, was automatisch geschehen kann oder aber vom Fahrer ausgelöst werden kann, wird Wasser direkt in die Mischtrommel 11 zugegeben. Eine bestimmte Wassermenge wird normalerweise unmittelbar vor dem Entladen zugegeben, und danach wird die Trommel mehrere Umdrehungen schnell gedreht (sogenanntes "aufmischen").Of the ready mixed concrete mixer is essentially only the mixing drum 11, the chute 23 and the water tank 12 shown. The water tank 12, which is under pressure, can deliver water via a line 15. In this line 15 is a flow rate control valve 13, which ensures a flow rate of about 130 l / min, and a water meter 14. The water meter 14 is heated by a heater 24. Behind the water meter 14, the line 15 branches into a water line 16, which leads directly into the interior of the mixing drum 11. In this water pipe 16, a valve 18 is provided. If this is opened, which can happen automatically or can be triggered by the driver, water is added directly into the mixing drum 11. A certain amount of water is normally added just before unloading, and then the drum is rotated several turns (so-called "mixing up") several times.

Eine weitere Leitung 17 führt zu einem Wasserschlauch 21, an dessen Ende eine Düse 22 vorgesehen ist. Mit dieser Düse 22 kann nach dem Entleeren sowohl das Innere der Mischtrommel 11 als auch die Rutsche 23 und das Äußere der Mischtrommel 11 gereinigt werden. Zu diesem Zweck ist ein Ventil 19 vorgesehen, das mittels eines Schalters 20 geöffnet und geschlossen werden kann. Erfindungsgemäß hat dieser Schalter 20 zwei Stellungen "ein", nämlich eine Stellung "außen" für die Reinigung der Rutsche 23 und der Mischtrommel 11 außen sowie eine Stellung "innen" für die Reinigung der Mischtrommel 11 innen. Der Wasserzähler 14 berücksichtigt nicht nur, ob das Ventil 18 oder das Ventil 19 geöffnet ist, sondern auch, in welcher Stellung der Schalter 20 steht. Auf diese Weise kann genau erfasst werden, wie viel Wasser nach dem Entleeren der Mischtrommel 11 infolge der Reinigung sich in der Mischtrommel 11 befindet.Another line 17 leads to a water hose 21, at the end of which a nozzle 22 is provided. With this nozzle 22, both the interior of the mixing drum 11 and the chute 23 and the exterior of the mixing drum 11 can be cleaned after emptying. For this purpose, a valve 19 is provided, which can be opened and closed by means of a switch 20. According to the invention, this switch 20 has two positions "on", namely a position "outside" for the cleaning of the chute 23 and the mixing drum 11 outside and a position "inside" for the cleaning of the mixing drum 11 inside. The water meter 14 not only takes into account whether the valve 18 or the valve 19 is open, but also in which position the switch 20 is. In this way, it can be accurately detected how much water after emptying the mixing drum 11 due to the cleaning is in the mixing drum 11.

Die vom Wasserzähler 14 erfasste Menge wird auf null gestellt, wenn sich die Mischtrommel 11 zumindest vier Mal in die Gegenrichtung dreht. Dadurch wird nämlich der gesamte Wasserinhalt abgegeben (sogenannte Restentleerung). Normalerweise erfolgt zwar die Restentleerung auf dem Gelände des Betonlieferanten und ist diesem somit bekannt; es ist aber denkbar, dass eine Restentleerung auf der Baustelle erfolgt, und auch in diesem Fall wird somit die korrekte Wassermenge (nämlich null) gemeldet.The amount detected by the water meter 14 is set to zero when the mixing drum 11 rotates at least four times in the opposite direction. As a result, the entire water content is given off (so-called emptying of the residue). Normally, the emptying takes place on the site of the concrete supplier and is thus known to him; However, it is conceivable that a residue emptying takes place on the construction site, and also in this case the correct amount of water (namely zero) is reported.

Gemäß der vorliegenden Erfindung kann somit nicht nur die vor der Entleerung zugegebene Wassermenge erfasst werden (egal ob die Wasserzugabe direkt über die Wasserleitung 16 oder über den Wasserschlauch 21 erfolgt), sondern auch die Wassermenge, die nach der Entleerung infolge der Reinigung in der Mischtrommel 11 verbleibt. Auf diese Weise kann diese Wassermenge bei der nächsten Beladung berücksichtigt werden, sodass auch bei dieser der Wassergehalt exakt eingestellt ist, ohne dass das Fahrzeug zuvor restentleert werden muss.Thus, according to the present invention, not only the amount of water added before discharge can be detected (regardless of whether the addition of water is made directly through the water pipe 16 or the water hose 21), but also the amount of water after being discharged in the mixing drum 11 remains. In this way, this amount of water can be taken into account at the next loading, so that even with this the water content is set exactly without the vehicle must be previously emptied before.

Die Restentleerung darf nur in speziellen Recyclinganlagen erfolgen, und diese haben nur eine begrenzte Kapazität. Es ist daher von Vorteil, wenn man die Anzahl der Restentleerungen gering halten kann.The emptying of residues may only be carried out in special recycling plants, and these only have a limited capacity. It is therefore advantageous to be able to keep the number of emptying of residues low.

Im Fahrzeug befindet sich weiters eine Auswerte- und Übertragungseinheit, die die gemessenen Werte an eine Zentrale überträgt, beispielsweise über das Handy-Netz. Die Fahrer können mit einem Tablet ausgestattet werden, mit dem sie sich in der Zentrale einloggen und die Werte, die ihr Fahrzeug betreffen, auslesen können. Somit sind auch die Fahrer stets mit den aktuellen Werten versorgt.The vehicle also contains an evaluation and transmission unit which transmits the measured values to a control center, for example via the mobile phone network. The drivers can be equipped with a tablet, with which they can log in at the headquarters and read out the values that affect their vehicle. Thus, the drivers are always supplied with the current values.

In der Mischtrommel 11 befindet sich ein Konsistenzmessgerät 29 in Form eines Stabs, der normal zur Wand der Mischtrommel 11 in das Innere der Mischtrommel 11 ragt und durch den Beton auf Biegung belastet wird. Die durch die Biegebelastung auftretenden Kräfte werden durch Dehnmessstreifen gemessen. Das Konsistenzmessgerät beinhaltet weiters einen Beschleunigungssensor, sodass die Winkelstellung der Trommel erkannt wird. Auf diese Weise kann man die Drehzahl erfassen, da sich die Winkelstellung nach jeweils genau einer Umdrehung wiederholt. Eine Auswerteschaltung, die vorzugsweise an der Außenseite der Mischtrommel 11 angebracht ist, kann nun aus der Drehzahl und den Messwerten der Dehnmessstreifen die Konsistenz berechnen. Die Messwerte werden drahtlos zur Auswerte- und Übertragungseinheit übertragen und von dieser zusammen mit anderen Messwerten (Wassermengen, GPS-Position, Temperatur) zur Zentrale übermittelt.In the mixing drum 11 is a consistency meter 29 in the form of a rod which projects normal to the wall of the mixing drum 11 in the interior of the mixing drum 11 and is loaded by the concrete to bending. The forces occurring due to the bending load are measured by strain gauges. The consistency meter includes Furthermore, an acceleration sensor, so that the angular position of the drum is detected. In this way you can detect the speed, as the angular position repeats after exactly one revolution. An evaluation circuit, which is preferably mounted on the outside of the mixing drum 11, can now calculate the consistency from the rotational speed and the measured values of the strain gauges. The measured values are transmitted wirelessly to the evaluation and transmission unit and transmitted by the latter together with other measured values (water quantities, GPS position, temperature) to the control center.

Es ist somit leicht, eine unzulässige Wasserzugabe zu erkennen, sei es vor der Befüllung (Restwasser) oder nach der Befüllung. Wenn zu viel Restwasser vorhanden ist, ist die Konsistenz gleich nach der Befüllung zu niedrig, wenn die Wasserzugabe nach der Befüllung erfolgt, dann ändert sich die Konsistenz sprungartig während des Transports. Auf Grund der GPS-Daten kann man feststellen, wo die unzulässige Wasserzugabe erfolgt ist.It is thus easy to detect an inadmissible addition of water, either before filling (residual water) or after filling. If too much residual water is present, the consistency is too low immediately after filling, if the water is added after filling, then the consistency changes abruptly during transport. Based on the GPS data, you can determine where the inadmissible water addition has occurred.

Claims (6)

Transportbetonmischer mit einer zum Drehen antreibbaren Mischtrommel (11), einer Rutsche (23) zur Abgabe des Betons, einem Wasserbehälter (12), einem Wasserzähler (14), einer Wasserleitung (16) zur Mischtrommel (11) sowie einem Wasserschlauch (21) zum Reinigen der Mischtrommel (11) und der Rutsche (23), wobei der Wasserzähler (14) unabhängig voneinander das durch die Wasserleitung (16) der Mischtrommel (11) zugeführte Wasser und das über den Wasserschlauch (21) entnommene Wasser misst und wobei ein Schalter (20) zum Einschalten der Wasserabgabe durch den Wasserschlauch (21) vorgesehen ist, dadurch gekennzeichnet, dass der Schalter (20) zum Einschalten der Wasserabgabe durch den Wasserschlauch (21) zwei Stellungen "ein" aufweist, nämlich eine für die Trommelinnenreinigung und eine für die Rutschenreinigung und die Trommelaußenreinigung, und dass nach dem Entleeren der Mischtrommel (11) entweder nur die Wasserabgabe durch den Wasserschlauch (21) für die Trommelinnenreinigung erfasst wird oder dass auch die Wasserabgabe durch den Wasserschlauch (21) für die Rutschenreinigung und die Trommelaußenreinigung erfasst wird und diese Werte an eine Zentrale übermittelt werden.Ready - mixed concrete mixer with a mixing drum (11) drivable for turning, a chute (23) for discharging the concrete, a water tank (12), a water meter (14), a water pipe (16) to the mixing drum (11) and a water hose (21) for Cleaning the mixing drum (11) and the chute (23), wherein the water meter (14) independently measures the water supplied through the water line (16) to the mixing drum (11) and the water taken out via the water hose (21) and a switch (20) is provided for switching on the water discharge through the water hose (21), characterized in that the switch (20) for switching on the water delivery through the water hose (21) has two positions "on", namely one for the drum interior cleaning and one for the chute cleaning and the drum outer cleaning, and that after emptying the mixing drum (11) either only the water discharge through the water hose (21) for cleaning the drum e is detected or that the water discharge through the water hose (21) for the chute cleaning and the drum outer cleaning is detected and these values are transmitted to a central office. Transportbetonmischer nach Anspruch 1, dadurch gekennzeichnet, dass der Wasserzähler (14) beheizbar ist.Transport concrete mixer according to claim 1, characterized in that the water meter (14) is heatable. Transportbetonmischer nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass vor oder nach dem Wasserzähler (14) ein Durchflussmengenregelventil (13) vorgesehen ist.Transport concrete mixer according to claim 1 or 2, characterized in that before or after the water meter (14) a flow rate control valve (13) is provided. Transportbetonmischer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass in der Mischtrommel (11) eine Konsistenzmesseinrichtung (29) angebracht ist.Transport concrete mixer according to one of claims 1 to 3, characterized in that in the mixing drum (11) a consistency measuring device (29) is mounted. Verfahren zum Betrieb eines Transportbetonmischers nach den Ansprüchen 1 bis 4, bei dem nach dem Entleeren der Mischtrommel (11) entweder nur die Wasserabgabe durch den Wasserschlauch (21) für die Trommelinnenreinigung erfasst wird oder auch die Wasserabgabe durch den Wasserschlauch (21) für die Rutschenreinigung und die Trommelaußenreinigung erfasst wird und diese Werte an eine Zentrale übermittelt werden, wobei der Fahrer nach Rückkehr von der Baustelle a) manchmal zur Restentleerung aufgefordert wird und dann die entleerte Menge mit den übermittelten Werten verglichen wird und wobei sonst b) die in der Mischtrommel (11) befindliche Wassermenge bei der nächsten Befüllung berücksichtigt wird. Method for operating a ready-mixed concrete mixer according to claims 1 to 4, wherein after emptying the mixing drum (11) either only the water discharge through the water hose (21) for the drum interior cleaning is detected or the water discharge through the water hose (21) for the chute cleaning and the drum exterior cleaning is detected and these values are transmitted to a central office, with the driver returning from the construction site a) is sometimes asked for emptying and then the emptied amount is compared with the transmitted values and otherwise b) the amount of water in the mixing drum (11) is taken into account in the next filling. Verfahren nach Anspruch 5 zum Betrieb eines Transportbetonmischers nach Anspruch 4, dadurch gekennzeichnet, dass zur Erkennung einer unzulässigen Wasserbeimengung die Konsistenz des Betons nach der nächsten Befüllung gemessen und mit einem Sollwert verglichen wird.A method according to claim 5 for operating a ready mixed concrete mixer according to claim 4, characterized in that the consistency of the concrete is measured after the next filling and compared with a desired value to detect an impermissible water addition.
EP18176299.8A 2017-06-06 2018-06-06 Transport concrete mixer and method for its operation Active EP3412369B1 (en)

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ATA50472/2017A AT520034B1 (en) 2017-06-06 2017-06-06 ready-mix concrete mixer

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JPS6412196A (en) * 1987-07-01 1989-01-17 Harman Co Ltd Attachment construction of antifreezing heat for water pipeline
DE19732833A1 (en) * 1996-07-31 1998-02-05 Mbt Holding Ag Method for monitoring and metering of additive materials for ready-mixed concrete delivery vehicles
GB2388055A (en) * 2002-03-02 2003-11-05 John H Gingell Concrete mixer with water flow sensor on water supply
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HUE057824T2 (en) 2022-06-28
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AT520034B1 (en) 2022-09-15

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