EP3412369B1 - 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
EP3412369B1
EP3412369B1 EP18176299.8A EP18176299A EP3412369B1 EP 3412369 B1 EP3412369 B1 EP 3412369B1 EP 18176299 A EP18176299 A EP 18176299A EP 3412369 B1 EP3412369 B1 EP 3412369B1
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EP
European Patent Office
Prior art keywords
water
cleaning
drum
mixing drum
concrete mixer
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EP18176299.8A
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German (de)
French (fr)
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EP3412369A1 (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 transport concrete mixer with a mixing drum that can be driven to rotate, a chute for dispensing 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 of one another passing through the water pipe measures the water supplied to the mixing drum and the water withdrawn via the water hose, and a switch being provided for switching on the water discharge through the water hose. It also relates to a method for operating such a ready-mixed concrete mixer.
  • Transport concrete mixers are normally not completely emptied when they return from the construction site to the concrete plant, but are immediately filled again with fresh concrete. In particular, if only a residual amount of, for example, 1 m 3 of concrete is poured in, an inadmissible amount of residual water has a significant effect.
  • a transport concrete mixer of the type mentioned according to the invention in that the switch for switching on the water delivery through the water hose has two "on" positions, namely one for cleaning the inside of the drum and one for cleaning the chute and cleaning the outside of the drum, and that after emptying the mixing drum either only dispenses water is recorded by the water hose for cleaning the inside of the drum or that the water discharge through the water hose for cleaning the chute and cleaning the outside of the drum is also recorded and these values are transmitted to a control center.
  • the amount of water added to the drum can be precisely recorded and the amount of water in the drum can be taken into account the next time it is filled, so that the remaining water does not deteriorate the concrete.
  • the driver is prompted to empty the remaining water if the amount of residual water determined by the measured values is already too high to be taken into account during the next filling, which will often be the case if only a little concrete is loaded during the next filling shall be.
  • the driver will also be asked to empty the water in the concrete works, as there is then the suspicion that the switch was operated incorrectly and it is therefore not clear how much water is in the mixing drum and how much water is used to clean the slide or the outside of the mixing drum was used.
  • the water meter is preferably heatable so that reliable values can be obtained even in winter, i.e. the temperature change has little or no effect due to the heating.
  • a flow rate control valve is preferably provided upstream or downstream of the water meter. Electronic flow meters only work precisely within a certain range of flow, and the flow rate control valve ensures that this range is not left. In the application according to the invention, a flow rate of 130 l / min is typical.
  • a consistency measuring device is attached in the mixing drum.
  • a suitable consistency measuring device is in the DE 102012017445 A described. It contains a rod that protrudes into the interior of the mixing drum normal to the wall of the mixing drum and is bent by the concrete. The forces that occur as a result of the bending load can be measured, and this allows conclusions to be drawn about the consistency of the concrete, as is described in detail in the cited document. This is much more precise than if one draws conclusions on the consistency based on the torque required for the drive, as is the case with the already mentioned DE 3310570 A is known.
  • the consistency of the concrete is measured after the next filling and compared with a target value in order to detect inadmissible admixture of water.
  • the present invention is explained in more detail with the aid of the accompanying drawing.
  • the single drawing shows a basic sketch of a transport concrete mixer according to the invention.
  • the water tank 12 which is under excess pressure, can deliver water via a line 15.
  • this line 15 there is a flow rate control valve 13, which ensures a flow rate of approximately 130 l / min, and a water meter 14.
  • the water meter 14 can be heated by a heater 24.
  • the line 15 branches off into a water line 16 which leads directly into the interior of the mixing drum 11.
  • a valve 18 is provided in this water line 16.
  • 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 “on” positions, namely an “outside” position for cleaning the chute 23 and the mixing drum 11 outside and an “inside” position for cleaning 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 what position the switch 20 is in. In this way, it is possible to determine precisely how much water is in the mixing drum 11 after the mixing drum 11 has been emptied as a result of the cleaning.
  • 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 released (so-called residual emptying). Normally, the remaining emptying takes place on the premises of the concrete supplier and is therefore known to him; however, it is conceivable that the construction site will empty the system completely, and in this case too the correct amount of water (namely zero) is reported.
  • the present invention not only the amount of water added before emptying can be recorded (regardless of whether the water is added directly via the water line 16 or via the water hose 21), but also the amount of water that is stored in the mixing drum 11 after emptying as a result of cleaning remains. In this way, this amount of water can be taken into account the next time it is loaded, so that the water content is precisely set for this too, without the vehicle having to be completely emptied beforehand.
  • the residue may only be emptied in special recycling plants, and these have only a limited capacity. It is therefore an advantage if you can keep the number of residue emptying low.
  • the driver can be equipped with a tablet with which they can log into the headquarters and read out the values relating to their vehicle. This means that the drivers are always provided with the latest values.
  • a consistency measuring device 29 in the form of a rod, which protrudes normal to the wall of the mixing drum 11 into the interior of the mixing drum 11 and is bent by the concrete.
  • the forces caused by the bending load are measured by strain gauges.
  • the consistency meter includes also an acceleration sensor, so that the angular position of the drum is recognized. In this way you can record the speed, since the angular position is repeated after exactly one rotation.
  • An evaluation circuit which is preferably attached to the outside of the mixing drum 11, can now calculate the consistency from the speed and the measured values of the strain gauges.
  • the measured values are transmitted wirelessly to the evaluation and transmission unit, which then transmits them to the control center together with other measured values (water quantities, GPS position, temperature).

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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)

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 transport concrete mixer with a mixing drum that can be driven to rotate, a chute for dispensing 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 of one another passing through the water pipe measures the water supplied to the mixing drum and the water withdrawn via the water hose, and a switch being provided for switching on the water discharge through the water hose. It also 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.If the water content is too high, concrete loses its ultimate strength. However, it happens again and again that unauthorized water is added in order to improve the flowability of the still liquid concrete. There are therefore already systems with which an unauthorized addition of water can be prevented or at least proven 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.So it's over DE 3310570 A known to measure the drive torque of the mixing drum. Water can only be added if this is sufficiently high (i.e. the concrete is not too flowable).

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).the end GB 2388055 A it is known to provide a water meter which always triggers an alarm signal when water is removed and the drum either stands still or mixes (i.e. only not if the drum is emptied by turning 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).the end US 6484079 B It is known to record numerous measurement data, in particular the amount of water added to the drum via the water pipe, separated according to automatic and manual addition (Col. 8, Z 52-61).

All diesen Verfahren ist gemeinsam, dass der Weg vom Beladen im Betonwerk bis zum Entladen auf der Baustelle überwacht wird.What all these processes have in common is that the path 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 was found in the context of the present invention, this is not the case sufficient. Transport concrete mixers are normally not completely emptied when they return from the construction site to the concrete plant, but are immediately filled again with fresh concrete. In particular, if only a residual amount of, for example, 1 m 3 of concrete is poured in, an inadmissible amount of residual water has a significant effect.

Aus US 2017072916 A ist ein Transportbetonmischer gemäß dem Oberbegriff des Anspruchs 1 bekannt. Dieses Dokument offenbart ein automatisches Reinigungssystem für Betonmischer, 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.the end US 2017072916 A a transport concrete mixer according to the preamble of claim 1 is known. This document discloses an automatic cleaning system for concrete mixers, it being disclosed that the residual water remaining in the drum after cleaning is taken into account during the next loading. The disadvantage of all previously known automatic cleaning systems, however, is that the water consumption is significantly higher than with manual cleaning. With manual cleaning, the driver sees which areas are soiled with concrete and only cleans them, while with automatic cleaning, all areas always have to be cleaned. Therefore, after an automatic cleaning, there is usually more water in the drum than can be taken into account for the next loading, so that it usually has to be completely emptied despite this detection. With automatic cleaning, different nozzles must be provided for cleaning the inside of the drum, for cleaning the outside of the drum and for cleaning the chute, so that it is inevitable that it is known where and how much water is used. For manual cleaning, however, only a single hose is provided, with which the driver cleans both the drum (inside and outside) and the slide. With current systems it is therefore not possible with manual cleaning to precisely determine 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 the object of the present invention to fill 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 transport concrete mixer of the type mentioned according to the invention in that the switch for switching on the water delivery through the water hose has two "on" positions, namely one for cleaning the inside of the drum and one for cleaning the chute and cleaning the outside of the drum, and that after emptying the mixing drum either only dispenses water is recorded by the water hose for cleaning the inside of the drum or that the water discharge through the water hose for cleaning the chute and cleaning the outside of the drum is also recorded and these values are transmitted to a control center.

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 precisely recorded and the amount of water in the drum can be taken into account the next time it is filled, so that the remaining water does not deteriorate the concrete.

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.This requires an honest driver who only selects the "outside" position when cleaning the chute and cleaning the outside of the mixing drum and the "inside" position when cleaning the inside of the mixing drum; However, if there are any suspicions (such as unusually high water consumption to clean the slide), the driver can be asked to empty the system at any time after returning from the construction site, which means that incorrect operation of the switch can be detected immediately.

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, according to the invention, the operation of the transport concrete mixer is characterized in that after the mixing drum has been emptied, either only the water discharge through the water hose for cleaning the inside of the drum is recorded or the water discharge through the water hose for cleaning the chute and the outside of the drum is recorded and these values are transmitted to a control center with the driver after returning from the construction site
  1. a) is sometimes requested to empty the residue 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 during 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 I 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 empty the remaining water if the amount of residual water determined by the measured values is already too high to be taken into account during the next filling, which will often be the case if only a little concrete is loaded during the next filling shall be. Especially with unusually high water consumption after emptying on the construction site of, for example, more than 40 I, however, the driver will also be asked to empty the water in the concrete works, as there is then the suspicion that the switch was operated incorrectly and it is therefore not clear how much water is in the mixing drum and how much water is used to clean the slide 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.The water meter is preferably heatable so that reliable values can be obtained even in winter, i.e. the temperature change has little or no effect 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 upstream or downstream of the water meter. Electronic flow meters only work precisely within a certain range of flow, and the flow rate control valve ensures that this range 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 attached in the mixing drum. A suitable consistency measuring device is in the DE 102012017445 A described. It contains a rod that protrudes into the interior of the mixing drum normal to the wall of the mixing drum and is bent by the concrete. The forces that occur as a result of the bending load can be measured, and this allows conclusions to be drawn about the consistency of the concrete, as is described in detail in the cited document. This is much more precise than if one draws conclusions on the consistency based on the torque required for the drive, as is the case with 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, according to one embodiment of the invention, when the transport concrete mixer is in operation, the consistency of the concrete is measured after the next filling and compared with a target value in order to detect inadmissible admixture 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 with poor quality (because "watered") concrete can be overlooked. To Each time it is loaded, it is checked whether the concrete consistency is correct, which is only the case if the correct amount of residual water was reported and correctly taken into account for the next loading.

Kurze Beschreibung der ZeichnungsfigurenBrief description of the drawing figures

Anhand der beiliegenden Zeichnung wird die vorliegende Erfindung näher erläutert. Die einzige Zeichnung zeigt eine Prinzipskizze eines erfindungsgemäßen Transportbetonmischers.The present invention is explained in more detail with the aid of the accompanying drawing. The single drawing shows a basic sketch of a transport concrete mixer according to the invention.

Beschreibung der AusführungsartenDescription of the types of execution

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 transport concrete mixer, essentially only the mixing drum 11, the chute 23 and the water container 12 are shown. The water tank 12, which is under excess pressure, can deliver water via a line 15. In this line 15 there is a flow rate control valve 13, which ensures a flow rate of approximately 130 l / min, and a water meter 14. The water meter 14 can be heated by a heater 24. After the water meter 14, the line 15 branches off into a water line 16 which leads directly into the interior of the mixing drum 11. A valve 18 is provided in this water line 16. When this is opened, which can happen automatically or can be triggered by the driver, water is added directly to the mixing drum 11. A certain amount of water is usually added just before unloading, and then the drum is rotated several revolutions quickly (so-called "mixing up").

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, after emptying, both the interior of the mixing drum 11 and the chute 23 and the exterior of the mixing drum 11 can be cleaned. 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 “on” positions, namely an “outside” position for cleaning the chute 23 and the mixing drum 11 outside and an “inside” position for cleaning 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 what position the switch 20 is in. In this way, it is possible to determine precisely how much water is in the mixing drum 11 after the mixing drum 11 has been emptied as a result of the cleaning.

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 released (so-called residual emptying). Normally, the remaining emptying takes place on the premises of the concrete supplier and is therefore known to him; however, it is conceivable that the construction site will empty the system completely, and in this case too 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.According to the present invention, not only the amount of water added before emptying can be recorded (regardless of whether the water is added directly via the water line 16 or via the water hose 21), but also the amount of water that is stored in the mixing drum 11 after emptying as a result of cleaning remains. In this way, this amount of water can be taken into account the next time it is loaded, so that the water content is precisely set for this too, without the vehicle having to be completely emptied beforehand.

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 residue may only be emptied in special recycling plants, and these have only a limited capacity. It is therefore an advantage if you can keep the number of residue emptying 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.There is also an evaluation and transmission unit in the vehicle that transmits the measured values to a control center, for example via the cell phone network. The drivers can be equipped with a tablet with which they can log into the headquarters and read out the values relating to their vehicle. This means that the drivers are always provided with the latest 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 there is a consistency measuring device 29 in the form of a rod, which protrudes normal to the wall of the mixing drum 11 into the interior of the mixing drum 11 and is bent by the concrete. The forces caused by the bending load are measured by strain gauges. The consistency meter includes also an acceleration sensor, so that the angular position of the drum is recognized. In this way you can record the speed, since the angular position is repeated after exactly one rotation. An evaluation circuit, which is preferably attached to the outside of the mixing drum 11, can now calculate the consistency from the speed and the measured values of the strain gauges. The measured values are transmitted wirelessly to the evaluation and transmission unit, which then transmits them to the control center together with other measured values (water quantities, GPS position, temperature).

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 therefore easy to detect an impermissible addition of water, be it before filling (residual water) or after filling. If there is too much residual water, the consistency is too low immediately after filling, if the water is added after filling, then the consistency changes abruptly during transport. The GPS data can be used to determine where the impermissible addition of water took place.

Claims (6)

  1. A transport concrete mixer having a mixing drum (11) drivable for rotating, a chute (23) for delivering the concrete, a water tank (12), a water meter (14), a water pipe (16) to the mixing drum (11), as well as a water hose (21) for cleaning the mixing drum (11) and the chute (23), wherein the water supplied to the mixing drum (11) through the water pipe (16) and the water withdrawn via the water hose (21) are measurable and detectable independently from each other by the water meter (14), and wherein a switch (20) is provided for switching on the water delivery through the water hose (21), characterized in that the switch (20) for switching on the water delivery through the water hose (21) includes two positions "on", namely one for cleaning the inside of the drum and one for cleaning the chute and for cleaning of the outside of the drum, and that after emptying the mixing drum (11), either only the water delivery through the water hose (21) for cleaning the inside of the drum is detectable or that in addition the water delivery through the water hose (21) for cleaning the chute and the outside of the drum is detectable, and these values are transmittable to a headquarter.
  2. The transport concrete mixer according to Claim 1, characterized in that the water meter (14) is heatable.
  3. The transport concrete mixer according to claim 1 or 2, characterized in that a flow rate control valve (13) is provided in front of or behind the water meter (14).
  4. The transport concrete mixer according to any of Claims 1 to 3, characterized in that a consistency measuring device (29) is attached in the mixing drum (11).
  5. A method for operating a transport concrete mixer according to claim 1 to 4, in which, after emptying the mixing drum (11), either only the water delivery through the water hose (21) for cleaning the inside of the drum or also the water delivery through the water hose (21) for cleaning the chute and the cleaning of the outside of the drum is detected, and these values are transmitted to a headquarter, wherein the driver after returning from the construction site
    a) is sometimes asked for residual emptying and then the emptied amount is compared with the transmitted values, and wherein otherwise
    b) the amount of water in the mixing drum (11) is taken into account during the next filling.
  6. The method according to claim 5 for operating a transport concrete mixer according to claim 4, characterized in that, in order to detect an inadmissible addition of water, the consistency of the concrete is measured after the next filling and is compared with a target value.
EP18176299.8A 2017-06-06 2018-06-06 Transport concrete mixer and method for its operation Active EP3412369B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50472/2017A AT520034B1 (en) 2017-06-06 2017-06-06 ready-mix concrete mixer

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EP3412369A1 EP3412369A1 (en) 2018-12-12
EP3412369B1 true EP3412369B1 (en) 2021-10-06

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EP18176299.8A Active EP3412369B1 (en) 2017-06-06 2018-06-06 Transport concrete mixer and method for its operation

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EP (1) EP3412369B1 (en)
AT (1) AT520034B1 (en)
HU (1) HUE057824T2 (en)

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Publication number Priority date Publication date Assignee Title
CN112549300B (en) * 2020-11-23 2022-04-19 富强科技股份有限公司 Surplus thick liquid recycle device of tubular pile production

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6412196A (en) * 1987-07-01 1989-01-17 Harman Co Ltd Attachment construction of antifreezing heat for water pipeline
FR2751911B1 (en) * 1996-07-31 2000-06-16 Mbt Holding Ag CONTROL AND DISTRIBUTION SYSTEM FOR CONCRETE MIXER AND METHOD OF USE
GB2388055B (en) * 2002-03-02 2004-06-16 John H Gingell Concrete mixers
US8418702B2 (en) * 2008-10-31 2013-04-16 Shadley F. Brand Ready mix truck wash
DE102012017445B4 (en) * 2012-09-04 2015-03-05 Franz Ludwig Gesellschaft für Mess- und Regeltechnik mbH System and method for measuring the moisture and the consistency of the mix of a drum mixer
CA2960144A1 (en) * 2014-09-05 2016-03-10 Command Alkon Dutch Tech B.V. System and method for determining a status of a valve
NO2744831T3 (en) * 2015-03-30 2018-05-05
WO2017044913A1 (en) * 2015-09-11 2017-03-16 Beck Manufacturing International, Inc. Concrete mixer truck cleaning system

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HUE057824T2 (en) 2022-06-28
AT520034B1 (en) 2022-09-15
AT520034A1 (en) 2018-12-15
EP3412369A1 (en) 2018-12-12

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