EP2867531B1 - Movable concrete pump and method for use thereof in the transport state - Google Patents

Movable concrete pump and method for use thereof in the transport state Download PDF

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Publication number
EP2867531B1
EP2867531B1 EP13726559.1A EP13726559A EP2867531B1 EP 2867531 B1 EP2867531 B1 EP 2867531B1 EP 13726559 A EP13726559 A EP 13726559A EP 2867531 B1 EP2867531 B1 EP 2867531B1
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Prior art keywords
pump
drive
delivery
cylinders
line
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EP13726559.1A
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German (de)
French (fr)
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EP2867531A1 (en
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Martin DIEBOLD
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Putzmeister Engineering GmbH
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Putzmeister Engineering GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous

Definitions

  • the invention relates to a mobile concrete pump in which two delivery cylinders, the delivery piston are connected via a respective common piston rod rigidly connected to the drive piston of an associated drive cylinder, in the operating state by means of a hydraulic pumping arrangement under promotion of concrete from a material feed container in a feed line in push-pull drivable and the Drive piston while in their working cylinders between their rod-side and bottom-side end positions in opposite directions are movable back and forth.
  • the invention also relates to a method for the use of such a concrete pump in the transport state.
  • a pre-assembled body frame is provided, which is mounted on the chassis of a truck chassis and connected to this.
  • the mounting frame is intended for receiving a support device, a core pump with material feed container and a distributor mast forming functional units and a drive assembly for controlling the functional units.
  • the drive assembly comprises one or more hydraulic pumps and other auxiliary pumps, for example for driving an agitator in the material feed container of the core pump.
  • a core pump usually a two-cylinder piston pump is used, which has two pairs of interconnected hydraulic drive cylinder and delivery cylinder whose pistons are rigidly connected in pairs via a common, passing through a water tank piston rod and driven by a hydraulic control in push-pull.
  • the concrete is supplied via the material feed tank, in which a stirrer and a pipe switch is located.
  • the diverter valve is the input side alternately pivoted in front of frontal openings of the two delivery cylinders and opens on the output side in a delivery line, which is guided over the distribution boom.
  • the core pump consisting of drive cylinders and delivery cylinders extends substantially along the chassis and extends from the material supply container in the rear region of the chassis over the rear axles away towards the cab to the front third of the chassis. Accordingly, the common piston rods with drive piston and delivery piston in the operating state in the longitudinal direction of the chassis back and forth in opposite directions. In the transport state, the piston rods remain with their pistons in the last occupied position.
  • the invention is based primarily on the object to improve the mobile concrete pump and the method of the type specified in that the axle load distribution of the concrete pump in the transport state can be moved as needed with simple means towards the front or rear axle.
  • the invention is based on the recognition that the position of the piston rods with their drive and delivery pistons within the core pumps in the transport state during road travel has a not insignificant influence on the axle load distribution. Accordingly, it is primarily proposed according to the invention that the drive pistons in the transport state of the concrete pump are moved together in their bottom-side or in their rod-side end position and stopped there ( US 3,146,721 ). With this measure, the center of gravity can be shifted in the direction of the front axle or by extending the two drive pistons in the direction of the rear axle as needed before the start of a ride or at the end of a pumping or cleaning process by retracting the two drive pistons.
  • main lines and the swing oil line of the hydraulic circuit can be connected either on the rod side or at the bottom end of the drive cylinder. In order to move the drive piston of the two piston rods in the transport state in their rod-side or bottom-side end position, therefore, it requires different hydraulic strategies.
  • a third solution variant of the invention provides that the drive pistons are moved in the transport state under the action of the feed pump in zero position of the adjustable reversing pump pressure in its bottom end position by the bottom side arranged swing oil line over a shut-off in operation branch with the below atmospheric pressure Storage tank is connected.
  • a fourth, technically somewhat more complicated solution variant of the invention provides that the drive pistons are moved together in the transport state under the action of the feed pump in zero position of the adjustable reversing on the one hand and an additional auxiliary pump pressure set on the other hand in its bottom end position, wherein the rod side arranged swing oil line is connected via a shut-off in the operating state branch with the additional auxiliary pump.
  • the auxiliary pump must be dimensioned such that the force exerted on the drive piston via the feed pump is overcompensated by the auxiliary pump.
  • an auxiliary pump can be switched on, for example, a Rjomaschinespumpe or mast pump.
  • FIG. 1 shown mobile concrete pump has a truck chassis 10 with a chassis 12 and arranged in the region of the front axle 13 cab 14, the motor drive via a drive train 16 with the rear axles 18 can be coupled.
  • the chassis 10 carries a concrete pump 20 which is connected via a body frame 22 to the chassis 12.
  • the concrete pump assembly essentially comprises a core pump 24 with two hydraulic drive cylinders 7, 8, two in pairs with the drive cylinders 7.8 via a water tank 28 connected conveyor cylinder 70,80 and one at the other end of the delivery cylinder 70,80 rigidly arranged material supply container 32.
  • the structure comprises a pressure conveying line 34 which is guided over a trained as articulated boom boom 36 and at the end of the last Mastarms has a subsidized concrete for concreting issuing end hose.
  • the distribution boom 36 is rotatably supported about a vertical axis on a mast pivot bracket 43 rigidly connected to the body frame 22 in the vicinity of the front end.
  • a mast support block 46 is arranged, on which the distribution boom 36 rests in the folded transport state.
  • a support device 38 is provided with extendable support legs 40. When concreting the support legs 40 are issued and supported by raising the chassis 12 on the ground.
  • the hydraulic pumps 44, 45 can be driven via the drive train 16 coming from the vehicle engine.
  • the core pump 24 rests on the mounting frame 22 and extends between the material feed container 32 obliquely forward over the rear axles 18 away in the direction of the cab 14th
  • axle load distribution can be varied by the piston rods 73,83 ( Fig. 2 ) with drive piston 71,81 and delivery piston 72,82 either retracted together or extended together. This will be the focus the mobile concrete pump either shifted forward or backward.
  • the hydraulic circuits shown are intended for two-cylinder high-pressure pumps which have two delivery cylinders 70, 80 whose front-side openings 74, 84 open into the material supply container 32 and are alternately taken during the compression stroke via a diverter 48 (FIG. Fig. 2 ) are connectable to a delivery line 50.
  • a diverter 48 FIG. Fig. 2
  • an adjustable reversing pump 44 is provided in the embodiments shown, the outputs of which are connected via a respective main line 52,54 at one end of the drive cylinder 7,8. At the other end, the drive cylinder 7,8 are connected to each other via a swing oil line 56.
  • the drive cylinders are 7.8 applied via the reversing pump 44 in push-pull with pressure.
  • the drive piston 71 extends in the drive cylinder 7 when the drive piston 81 in the drive cylinder 8 is pushed back over the oil flowing in the swing oil line 56.
  • the reversing pump 44 reverses its conveying direction so that the drive pistons 71, 81 move in the other direction. From the closed main circuit consisting of reversing pump 44, main lines 52,54, drive cylinder 7,8 and swing oil line 56, a corresponding amount of oil is always fed via the shuttle valve 58 and the pressure relief valve 62 in the tank 60 under atmospheric pressure.
  • a suction side connected to the tank 60 feed pump 45 is provided, via which one of the outflow of the outlet valve 58 amount of oil corresponding amount of oil is fed via the connected to the main lines 52,54 check valves 64,66 again on the low pressure side of the reversing pump 44. Any excess quantity flows via the pressure limiting valve 62 into the tank 60. If the reversing pump 44 is at zero delivery in the operating state, equal pressure prevails in the main lines.
  • a special feature of the invention consists in the fact that, depending on the need before starting a journey or at the end of a pumping operation, when the truck-mounted concrete pump is in its transport state, the piston rods 73,83 can be retracted or extended together in both drive cylinders 7,8.
  • Fig. 3a The feed pressure generated by the feed pump 45, which is set to, for example, 34 bar, abuts against the rod side of the drive cylinders 7, 8. Through the valve 90, the rocking oil is discharged at the bottom end of the drive cylinder 7,8 in the storage tank 60. As a result, the drive pistons 71, 81 with piston rod 73, 83 and delivery piston 72, 82 reach their inserted bottom end position. The center of gravity 98 of the truck-mounted concrete pump is displaced in the direction of the front axle 13.
  • Fig. 3c Here is the feed pressure of the feed pump 45 on the bottom side of the drive piston 71,81.
  • the drive piston can not be pushed back by means of the feed pump 45 alone.
  • an auxiliary pump 68 for example an agitator pump and a directional control valve 94, oil is fed externally into the rocker oil line.
  • an additional pressure limiting valve 96 is provided whose limiting value (about 200 bar) is higher than that of the pressure limiting valve 62 of the feed pump 45 (about 34 bar).
  • Fig. 3d Through the valve 95, the swing oil line 56 is connected to the drive-side main line 54 here. Due to the area ratios between the bottom-side and rod-side piston surface in the drive cylinders 7.8, the drive pistons 71, 81 together with piston rods 73, 83 and delivery pistons 72, 82 are displaced in the direction of the bottom end of the drive cylinders 7, 8. This gives us a shift of emphasis towards the rear axle 18.
  • the invention relates to a method for the use of a mobile concrete pump, in which two delivery cylinder 70,80, the delivery piston 72,82 via a respective common piston rod 73,83 rigidly with the drive piston 71,81 of an associated drive cylinder 7.8 are connected.
  • the delivery pistons 72,82 driven by a hydraulic pumping assembly 44,45 while conveying concrete from a material feed tank 32 in a feed line 50 in push-pull by the drive piston 71,81 are moved in their working cylinders 7,8 between their rod-side and bottom end positions in opposite directions back and forth ,
  • the drive pistons 71, 81 in the transport state of the concrete pump are moved together in their bottom-side or in their rod-side end position and stopped there.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft eine fahrbare Betonpumpe, bei welcher zwei Förderzylinder, deren Förderkolben über je eine gemeinsame Kolbenstange starr mit dem Antriebskolben eines zugehörigen Antriebszylinders verbunden sind, im Betriebszustand mittels einer hydraulischen Pumpanordnung unter Förderung von Beton aus einem Materialaufgabebehälter in eine Förderleitung im Gegentakt antreibbar und die Antriebskolben dabei in ihren Arbeitszylindern zwischen ihren stangenseitigen und bodenseitigen Endlagen gegensinnig hin und her bewegbar sind. Die Erfindung betrifft außerdem ein Verfahren für den Einsatz einer solchen Betonpumpe im Transportzustand.The invention relates to a mobile concrete pump in which two delivery cylinders, the delivery piston are connected via a respective common piston rod rigidly connected to the drive piston of an associated drive cylinder, in the operating state by means of a hydraulic pumping arrangement under promotion of concrete from a material feed container in a feed line in push-pull drivable and the Drive piston while in their working cylinders between their rod-side and bottom-side end positions in opposite directions are movable back and forth. The invention also relates to a method for the use of such a concrete pump in the transport state.

Bei einer fahrbaren Betonpumpe ist üblicherweise ein vormontierter Aufbaurahmen vorgesehen, der auf das Fahrgestell eines LKW-Chassis aufgesetzt und mit diesem verbunden ist. Der Aufbaurahmen ist zur Aufnahme von eine Abstützvorrichtung, eine Kernpumpe mit Materialaufgabebehälter und einen Verteilermast bildenden Funktionseinheiten sowie einer Antriebsbaugruppe zur Ansteuerung der Funktionseinheiten bestimmt. Je nach Pumpenmodell umfasst die Antriebsbaugruppe eine oder mehrere Hydraulikpumpen sowie weitere Hilfspumpen, beispielsweise für den Antrieb eines Rührwerks im Materialaufgabebehälter der Kernpumpe. Als Kernpumpe wird üblicherweise eine Zweizylinder-Kolbenpumpe verwendet, die zwei paarweise miteinander verbundene hydraulische Antriebszylinder und Förderzylinder aufweist, deren Kolben paarweise über eine gemeinsame, durch einen Wasserkasten hindurchgreifende Kolbenstange starr miteinander verbunden und über eine Hydrauliksteuerung im Gegentakt antreibbar sind. Der Beton wird über den Materialaufgabebehälter zugeführt, in welchem sich ein Rührwerk und eine Rohrweiche befindet. Die Rohrweiche wird eingangsseitig abwechselnd vor stirnseitige Öffnungen der beiden Förderzylinder geschwenkt und mündet ausgangsseitig in eine Förderleitung, die über den Verteilermast geführt ist. Die Kernpumpe bestehend aus Antriebszylindern und Förderzylindern erstreckt sich im Wesentlichen längs des Fahrgestells und reicht vom Materialaufgabebehälter im rückwärtigen Bereich des Fahrgestells über die Hinterachsen hinweg nach vorne in Richtung Führerhaus bis zum vorderen Drittel des Fahrgestells. Dementsprechend werden die gemeinsamen Kolbenstangen mit Antriebskolben und Förderkolben im Betriebszustand in Längsrichtung des Fahrgestells gegensinnig hin- und herverschoben. Im Transportzustand verbleiben die Kolbenstangen mit ihren Kolben in der zuletzt eingenommenen Lage.In a mobile concrete pump usually a pre-assembled body frame is provided, which is mounted on the chassis of a truck chassis and connected to this. The mounting frame is intended for receiving a support device, a core pump with material feed container and a distributor mast forming functional units and a drive assembly for controlling the functional units. Depending on the pump model, the drive assembly comprises one or more hydraulic pumps and other auxiliary pumps, for example for driving an agitator in the material feed container of the core pump. As a core pump usually a two-cylinder piston pump is used, which has two pairs of interconnected hydraulic drive cylinder and delivery cylinder whose pistons are rigidly connected in pairs via a common, passing through a water tank piston rod and driven by a hydraulic control in push-pull. The concrete is supplied via the material feed tank, in which a stirrer and a pipe switch is located. The diverter valve is the input side alternately pivoted in front of frontal openings of the two delivery cylinders and opens on the output side in a delivery line, which is guided over the distribution boom. The core pump consisting of drive cylinders and delivery cylinders extends substantially along the chassis and extends from the material supply container in the rear region of the chassis over the rear axles away towards the cab to the front third of the chassis. Accordingly, the common piston rods with drive piston and delivery piston in the operating state in the longitudinal direction of the chassis back and forth in opposite directions. In the transport state, the piston rods remain with their pistons in the last occupied position.

Weiter ist es bei einer Betonpumpe der eingangs angegebenen Art an sich bekannt ( DE-195 42 258 A1 ), dass die Antriebszylinder im Betriebszustand an ihrem einen Ende über eine Hauptleitung abwechselnd mit einer Hochdruckseite und einer Niederdruckseite der Pumpanordnung und an ihrem anderen Ende über eine Schaukelölleitung miteinander verbunden, wobei die Pumpanordnung eine als einstellbare Reversierpumpe ausgebildete, in einem geschlossenen Hydraulikkreis mit den Antriebszylindern angeordnete Hauptpumpe sowie eine druckseitig über Rückschlagventile an den Hauptkreis und eingangsseitig an einen Vorratstank angeschlossene Speisepumpe umfasst.Next, it is in a concrete pump of the type specified in the known ( DE-195 42 258 A1 ), that the drive cylinder in the operating state at its one end via a main line alternately connected to a high pressure side and a low pressure side of the pump assembly and at the other end via a swing oil line, wherein the pumping arrangement designed as an adjustable reversing, in a closed hydraulic circuit with the drive cylinders arranged main pump and a pressure side via check valves to the main circuit and the input side connected to a storage tank feed pump comprises.

Um die gesetzlichen Anforderungen für den Straßenverkehr zu erfüllen, dürfen die maximal zulässigen Achslasten einer fahrbaren Betonpumpe bei der Straßenfahrt nicht überschritten werdenIn order to meet the legal requirements for road traffic, the maximum permissible axle loads of a mobile concrete pump must not be exceeded during road driving

Ausgehend hiervon liegt der Erfindung vor allem die Aufgabe zugrunde, die fahrbare Betonpumpe sowie das Verfahren der eingangs angegebenen Art dahingehend zu verbessern, dass die Achslastverteilung der Betonpumpe im Transportzustand bei Bedarf mit einfachen Mitteln in Richtung Vorder- oder Hinterachse verlagert werden kann.Proceeding from this, the invention is based primarily on the object to improve the mobile concrete pump and the method of the type specified in that the axle load distribution of the concrete pump in the transport state can be moved as needed with simple means towards the front or rear axle.

Die Erfindung geht dabei von der Erkenntnis aus, dass die Lage der Kolbenstangen mit ihren Antriebs- und Förderkolben innerhalb der Kernpumpen im Transportzustand bei der Straßenfahrt einen nicht unerheblichen Einfluss auf die Achslastverteilung hat. Dementsprechend wird gemäß der Erfindung primär vorgeschlagen, dass die Antriebskolben im Transportzustand der Betonpumpe gemeinsam in ihre bodenseitige oder in ihre stangenseitige Endlage bewegt und dort angehalten werden ( US-3,146,721 ). Mit dieser Maßnahme kann je nach Bedarf vor Antritt einer Fahrt bzw. bei Beendigung eines Pump- oder Reinigungsvorgangs durch Einfahren der beiden Antriebskolben der Schwerpunkt in Richtung Vorderachse oder durch Ausfahren der beiden Antriebskolben in Richtung Hinterachse verlagert werden. Dabei ist zu berücksichtigen, dass die Hauptleitungen und die Schaukelölleitung des Hydraulikkreises entweder am stangenseitigen oder am bodenseitigen Ende der Antriebszylinder angeschlossen sein können. Um die Antriebskolben der beiden Kolbenstangen im Transportzustand in ihre stangenseitige oder bodenseitige Endlage verschieben zu können, bedarf es daher unterschiedlicher hydraulischer Strategien.The invention is based on the recognition that the position of the piston rods with their drive and delivery pistons within the core pumps in the transport state during road travel has a not insignificant influence on the axle load distribution. Accordingly, it is primarily proposed according to the invention that the drive pistons in the transport state of the concrete pump are moved together in their bottom-side or in their rod-side end position and stopped there ( US 3,146,721 ). With this measure, the center of gravity can be shifted in the direction of the front axle or by extending the two drive pistons in the direction of the rear axle as needed before the start of a ride or at the end of a pumping or cleaning process by retracting the two drive pistons. It should be noted that the main lines and the swing oil line of the hydraulic circuit can be connected either on the rod side or at the bottom end of the drive cylinder. In order to move the drive piston of the two piston rods in the transport state in their rod-side or bottom-side end position, therefore, it requires different hydraulic strategies.

Dementsprechend wird gemäß einer ersten und zweiten Lösungsvariante der Erfindung, bei welcher die Antriebskolben im Transportzustand unter der Einwirkung des über die Speisepumpe in Null-Stellung der einstellbaren Reversierpumpe aufgebauten Druckes gemeinsam in ihre stangenseitige Endlage bewegt werden sollen, die stangenseitig oder bodenseitig angeordnete Schaukelölleitung über eine im Betriebszustand absperrbare Abzweigung mit einer Hauptleitung des Hydraulikkreises verbunden.Accordingly, according to a first and second solution variant of the invention, in which the drive piston in the transport state under the action of the feed pump via the zero position of the adjustable reversing pump pressure to be moved together in their rod end position, the rod side or bottom side arranged swing oil line via a in the operating state lockable branch connected to a main line of the hydraulic circuit.

Eine dritte Lösungsvariante der Erfindung sieht vor, dass die Antriebskolben im Transportzustand unter der Einwirkung des über die Speisepumpe in Nullstellung der einstellbaren Reversierpumpe aufgebauten Druckes in ihre bodenseitige Endlage bewegt werden, indem die bodenseitig angeordnete Schaukelölleitung über eine im Betriebszustand absperrbare Abzweigung mit dem unter Atmosphärendruck stehenden Vorratstank verbunden wird.A third solution variant of the invention provides that the drive pistons are moved in the transport state under the action of the feed pump in zero position of the adjustable reversing pump pressure in its bottom end position by the bottom side arranged swing oil line over a shut-off in operation branch with the below atmospheric pressure Storage tank is connected.

Eine vierte, technisch etwas aufwendigere Lösungsvariante der Erfindung sieht vor, dass die Antriebskolben im Transportzustand unter der Einwirkung des über die Speisepumpe in Nullstellung der einstellbaren Reversierpumpe einerseits und einer zusätzlichen Hilfspumpe andererseits eingestellten Druckes gemeinsam in ihre bodenseitige Endlage bewegt werden, wobei die stangenseitig angeordnete Schaukelölleitung über eine im Betriebszustand absperrbare Abzweigung mit der zusätzlichen Hilfspumpe verbunden wird. Die Hilfspumpe muss dabei so dimensioniert werden, dass die über die Speisepumpe auf den Antriebskolben ausgeübte Kraft durch die Hilfspumpe überkompensiert wird. Als Hilfspumpe kann dabei beispielsweise eine Rührwerkspumpe oder Mastpumpe zugeschaltet werden.A fourth, technically somewhat more complicated solution variant of the invention provides that the drive pistons are moved together in the transport state under the action of the feed pump in zero position of the adjustable reversing on the one hand and an additional auxiliary pump pressure set on the other hand in its bottom end position, wherein the rod side arranged swing oil line is connected via a shut-off in the operating state branch with the additional auxiliary pump. The auxiliary pump must be dimensioned such that the force exerted on the drive piston via the feed pump is overcompensated by the auxiliary pump. As an auxiliary pump can be switched on, for example, a Rührwerkspumpe or mast pump.

Im Folgenden wird die Erfindung anhand der in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiele näher erläutert. Es zeigen

Fig. 1
eine Seitenansicht einer als Autobetonpumpe ausgebildeten fahrbaren Betonpumpe mit hydraulischer Kernpumpe;
Fig. 2
eine schaubildliche Darstellung der Kernpumpe nach Fig. 1;
Fig. 3a
bis d ein Schaltschema der Kernpumpe mit vier verschiedenen Ausführungsvarianten für die Schwerpunktverlagerung der jeweiligen Kolbenanordnung im Transportzustand.
In the following the invention will be explained in more detail with reference to the embodiments schematically illustrated in the drawing. Show it
Fig. 1
a side view of a designed as a truck-mounted concrete mobile concrete pump with hydraulic core pump;
Fig. 2
a perspective view of the core pump after Fig. 1 ;
Fig. 3a
to d is a circuit diagram of the core pump with four different design variants for the center of gravity displacement of the respective piston assembly in the transport state.

Die in Fig. 1 dargestellte fahrbare Betonpumpe weist ein LKW-Chassis 10 mit einem Fahrgestell 12 und einem im Bereich der Vorderachse 13 angeordneten Führerhaus 14 auf, dessen Motorantrieb über einen Antriebsstrang 16 mit den Hinterachsen 18 kuppelbar ist. Das Chassis 10 trägt eine Betonpumpe 20, die über einen Aufbaurahmen 22 mit dem Fahrgestell 12 verbunden ist. Der Betonpumpenaufbau umfasst im Wesentlichen eine Kernpumpe 24 mit zwei hydraulischen Antriebszylindern 7,8, zwei paarweise mit den Antriebszylindern 7,8 über einen Wasserkasten 28 verbundene Förderzylinder 70,80 und einen am anderen Ende der Förderzylinder 70,80 starr angeordneten Materialaufgabebehälter 32. Weiter umfasst der Aufbau eine Druckförderleitung 34, die über einen als Knickmast ausgebildeten Verteilermast 36 geführt ist und am Ende des letzten Mastarms einen den geförderten Beton zur Betonierstelle ausgebenden Endschlauch aufweist. Der Verteilermast 36 ist auf einem in der Nähe des stirnseitigen Endes mit dem Aufbaurahmen 22 starr verbundenen Mastdrehlagerbock 43 um eine vertikale Achse drehbar gelagert. Am rückwärtigen Ende des Aufbaurahmens 22 ist ein Mastauflagerbock 46 angeordnet, auf welchem der Verteilermast 36 im eingeklappten Transportzustand aufliegt. Weiter ist eine Abstützvorrichtung 38 mit ausstellbaren Stützbeinen 40 vorgesehen. Beim Betonierbetrieb werden die Stützbeine 40 ausgestellt und unter Anhebung des Fahrgestells 12 auf dem Erdboden abgestützt. Der hydraulische Antrieb der Kernpumpe 24 des Verteilermasts 36 und der Stützbeine 40 erfolgt über eine Antriebsbaugruppe 42, bestehend aus Hydraulikpumpen 44,45 und einem nicht dargestellten Vorratsbehälter für das Hydrauliköl. Die Hydraulikpumpen 44,45 sind über den vom Fahrzeugmotor kommenden Antriebsstrang 16 antreibbar.In the Fig. 1 shown mobile concrete pump has a truck chassis 10 with a chassis 12 and arranged in the region of the front axle 13 cab 14, the motor drive via a drive train 16 with the rear axles 18 can be coupled. The chassis 10 carries a concrete pump 20 which is connected via a body frame 22 to the chassis 12. The concrete pump assembly essentially comprises a core pump 24 with two hydraulic drive cylinders 7, 8, two in pairs with the drive cylinders 7.8 via a water tank 28 connected conveyor cylinder 70,80 and one at the other end of the delivery cylinder 70,80 rigidly arranged material supply container 32. Furthermore, the structure comprises a pressure conveying line 34 which is guided over a trained as articulated boom boom 36 and at the end of the last Mastarms has a subsidized concrete for concreting issuing end hose. The distribution boom 36 is rotatably supported about a vertical axis on a mast pivot bracket 43 rigidly connected to the body frame 22 in the vicinity of the front end. At the rear end of the mounting frame 22, a mast support block 46 is arranged, on which the distribution boom 36 rests in the folded transport state. Further, a support device 38 is provided with extendable support legs 40. When concreting the support legs 40 are issued and supported by raising the chassis 12 on the ground. The hydraulic drive of the core pump 24 of the distribution boom 36 and the support legs 40 via a drive assembly 42, consisting of hydraulic pumps 44,45 and a reservoir for the hydraulic oil, not shown. The hydraulic pumps 44, 45 can be driven via the drive train 16 coming from the vehicle engine.

Die Kernpumpe 24 liegt auf dem Aufbaurahmen 22 auf und erstreckt sich zwischen dem Materialaufgabebehälter 32 schräg nach vorne über die Hinterachsen 18 hinweg in Richtung Fahrerhaus 14.The core pump 24 rests on the mounting frame 22 and extends between the material feed container 32 obliquely forward over the rear axles 18 away in the direction of the cab 14th

In der in Fig. 1 gezeigten Transportstellung mit eingeklapptem Verteilermast 36 und eingezogenen Stützbeinen 40 ist es wichtig, dass die Achslasten auf der Vorderachse 13 und den Hinterachsen 18 nicht die aufgrund gesetzlicher Bestimmungen vorgeschriebenen Werte überschreiten. Im Grenzfall kann mit der in Fig. 1 gezeigten Konstruktion einer fahrbaren Betonpumpe die Achslastverteilung dadurch variiert werden, dass die Kolbenstangen 73,83 (Fig. 2) mit Antriebskolben 71,81 und Förderkolben 72,82 entweder gemeinsam eingefahren oder gemeinsam ausgefahren werden. Dadurch wird der Schwerpunkt der fahrbaren Betonpumpe entweder nach vorne oder nach hinten verlagert.In the in Fig. 1 shown transport position with folded distributor boom 36 and retracted support legs 40, it is important that the axle loads on the front axle 13 and the rear axles 18 do not exceed the prescribed by law provisions. In the borderline case with the in Fig. 1 shown construction of a mobile concrete pump, the axle load distribution can be varied by the piston rods 73,83 ( Fig. 2 ) with drive piston 71,81 and delivery piston 72,82 either retracted together or extended together. This will be the focus the mobile concrete pump either shifted forward or backward.

Die in Fig. 3a bis 3d gezeigten Hydraulikschaltungen sind für ZweizylinderDickstoffpumpen bestimmt, die zwei Förderzylinder 70,80 aufweisen, deren stirnseitige Öffnungen 74,84 in den Materialaufgabebehälter 32 münden und abwechselnd während des Druckhubs über eine Rohrweiche 48 (Fig. 2) mit einer Förderleitung 50 verbindbar sind. Für den Antrieb der Antriebszylinder 7,8 ist bei den gezeigten Ausführungsbeispielen jeweils eine verstellbare Reversierpumpe 44 vorgesehen, deren Ausgänge über jeweils eine Hauptleitung 52,54 am einen Ende eines der Antriebszylinder 7,8 angeschlossen ist. Am anderen Ende sind die Antriebszylinder 7,8 über eine Schaukelölleitung 56 miteinander verbunden. Im Betriebszustand werden die Antriebszylinder 7,8 über die Reversierpumpe 44 im Gegentakt mit Druck beaufschlagt. Dies führt dazu, dass der Antriebskolben 71 im Antriebszylinder 7 ausfährt, wenn der Antriebskolben 81 im Antriebszylinder 8 über das in der Schaukelölleitung 56 strömende Öl zurückgeschoben wird. Haben die beiden Antriebskolben 71,81 ihre Endlage erreicht, kehrt die Reversierpumpe 44 ihre Förderrichtung um, so dass sich die Antriebskolben 71,81 in die jeweils andere Richtung bewegen. Aus dem geschlossenen Hauptkreis bestehend aus Reversierpumpe 44, Hauptleitungen 52,54, Antriebszylinder 7,8 und Schaukelölleitung 56 wird immer eine entsprechende Ölmenge über das Wechselventil 58 und das Druckbegrenzungsventil 62 in den unter Atmosphärendruck stehenden Tank 60 ausgespeist. Über das Druckbegrenzungsventil 62 kann dabei die auszuspeisende Ölmenge eingestellt werden. Zusätzlich ist eine saugseitig mit dem Tank 60 verbundene Speisepumpe 45 vorgesehen, über die eine der am Wechselventil 58 ausgespeisten Ölmenge entsprechende Ölmenge über die mit den Hauptleitungen 52,54 verbundenen Rückschlagventile 64,66 wieder auf der Niederdruckseite der Reversierpumpe 44 eingespeist wird. Eine eventuelle Überschussmenge fließt über das Druckbegrenzungsventil 62 in den Tank 60. Befindet sich die Reversierpumpe 44 im Betriebszustand auf Nullförderung, herrscht in den Hauptleitungen Gleichdruck.In the Fig. 3a to 3d The hydraulic circuits shown are intended for two-cylinder high-pressure pumps which have two delivery cylinders 70, 80 whose front-side openings 74, 84 open into the material supply container 32 and are alternately taken during the compression stroke via a diverter 48 (FIG. Fig. 2 ) are connectable to a delivery line 50. For the drive of the drive cylinder 7,8, an adjustable reversing pump 44 is provided in the embodiments shown, the outputs of which are connected via a respective main line 52,54 at one end of the drive cylinder 7,8. At the other end, the drive cylinder 7,8 are connected to each other via a swing oil line 56. In the operating state, the drive cylinders are 7.8 applied via the reversing pump 44 in push-pull with pressure. As a result, the drive piston 71 extends in the drive cylinder 7 when the drive piston 81 in the drive cylinder 8 is pushed back over the oil flowing in the swing oil line 56. If the two drive pistons 71, 81 have reached their end position, the reversing pump 44 reverses its conveying direction so that the drive pistons 71, 81 move in the other direction. From the closed main circuit consisting of reversing pump 44, main lines 52,54, drive cylinder 7,8 and swing oil line 56, a corresponding amount of oil is always fed via the shuttle valve 58 and the pressure relief valve 62 in the tank 60 under atmospheric pressure. About the pressure relief valve 62 while the auszuspeisende amount of oil can be adjusted. In addition, a suction side connected to the tank 60 feed pump 45 is provided, via which one of the outflow of the outlet valve 58 amount of oil corresponding amount of oil is fed via the connected to the main lines 52,54 check valves 64,66 again on the low pressure side of the reversing pump 44. Any excess quantity flows via the pressure limiting valve 62 into the tank 60. If the reversing pump 44 is at zero delivery in the operating state, equal pressure prevails in the main lines.

In diesem Zustand fließt die komplette Ölmenge der Speisepumpe 45 über das Druckbegrenzungsventil 62 in den Tank 60.In this state, the entire amount of oil of the feed pump 45 flows via the pressure relief valve 62 into the tank 60th

Die vier in den Fig. 3a bis d gezeigten Ausführungsvarianten unterscheiden sich einmal darin, dass bei den Ausführungsvarianten nach Fig. 3a und b die beiden Hauptleitungen 52,54 an den Antriebszylindern 7,8 stangenseitig und die Schaukelölleitung 56 bodenseitig angeschlossen sind, während im Falle der Fig. 3c und d die Hauptleitungen 52,54 bodenseitig und die Schaukelölleitung 56 stangenseitig angeschlossen sind. Eine Besonderheit der Erfindung besteht nun darin, dass je nach Bedarf vor Antritt einer Fahrt bzw. bei Beendigung eines Pumpvorgangs, wenn sich die Autobetonpumpe in ihrem Transportzustand befindet, die Kolbenstangen 73,83 in beiden Antriebszylindern 7,8 gemeinsam eingefahren oder ausgefahren werden können. Im ersteren Falle wird der Schwerpunkt der Autobetonpumpe zur Vorderachse 13 hin nach vorne und im letzteren Falle zu den Hinterachsen 18 hin nach hinten verlagert. Je nach Anschlussseite der Hauptleitungen 52,54 und der Schaukelölleitung 56 ergeben sich hierfür unterschiedliche Schaltungsanordnungen. Allen Schaltungsanordnungen gemeinsam ist es, dass je nach gewünschter Schwerpunktverlagerung über vorhandene Pumpen 45,68 eine auf die Antriebskolben 71,81 resultierende Kraft ausgeübt wird, die die gewünschte Verschiebung bewirkt. Dabei ist zu berücksichtigen, dass die bodenseitigen und die stangenseitigen Kolbenflächen der Antriebskolben 71,81 unterschiedlich groß sind. Hinzu kommt, dass die Schwerpunktverlagerung nur dann ausgelöst wird, wenn das Fördervolumen der Reversierpumpe 44 auf Null steht.The four in the Fig. 3a to d variants shown once differ in that in the embodiments according to Fig. 3a and b the two main lines 52,54 to the drive cylinders 7,8 rod side and the swing oil line 56 are connected to the bottom side, while in the case of Fig. 3c and d the main lines 52,54 bottom side and the swing oil line 56 are connected rod side. A special feature of the invention consists in the fact that, depending on the need before starting a journey or at the end of a pumping operation, when the truck-mounted concrete pump is in its transport state, the piston rods 73,83 can be retracted or extended together in both drive cylinders 7,8. In the former case, the center of gravity of the truck-mounted concrete pump is shifted towards the front axle 13 towards the front and in the latter case towards the rear axles 18 towards the rear. Depending on the connection side of the main lines 52,54 and the swing oil line 56 this results in different circuit arrangements. It is common to all circuit arrangements that, depending on the desired center of gravity displacement, a force which results on the drive pistons 71, 81 is exerted via existing pumps 45, 68, which force produces the desired displacement. It should be noted that the bottom side and the rod side piston surfaces of the drive piston 71,81 are different in size. In addition, the center of gravity displacement is only triggered when the delivery volume of the reversing 44 is zero.

Unter Berücksichtigung dieser Voraussetzungen ist anhand der Fig. 3a bis d erkennbar, dass im Falle der Ausführungsvarianten nach Fig. 3a, b und d allein die Speisepumpe 45 ausreicht, um die Kolbenverschiebung zur gewünschten Schwerpunktverlagerung zu bewerkstelligen. Lediglich beim Ausführungsbeispiel 3c ist zusätzlich eine Hilfspumpe 68 , beispielsweise die Rührwerkspumpe erforderlich.Taking into account these conditions, the basis of the Fig. 3a to d recognizable that in the case of the embodiments according to Fig. 3a, b and d only the feed pump 45 is sufficient to accomplish the piston displacement to the desired center of gravity displacement. Only in the embodiment 3c, an auxiliary pump 68, for example, the agitator pump is required in addition.

Die einzelnen Betriebsvarianten gemäß Fig. 3a bis d führen im abgeschalteten Zustand der Reversierpumpe 44 (Fördervolumen Null) zu folgenden Schwerpunktverlagerungen.The individual operating variants according to Fig. 3a to d lead in the off state of the reversing pump 44 (delivery volume zero) to the following center of gravity shifts.

Fig. 3a: Der durch die Speisepumpe 45 erzeugte Speisedruck, der beispielsweise auf 34 bar eingestellt ist, liegt an der Stangenseite der Antriebszylinder 7,8 an. Durch das Ventil 90 wird das Schaukelöl am bodenseitigen Ende der Antriebszylinder 7,8 in den Vorratstank 60 abgelassen. Dadurch gelangen die Antriebskolben 71,81 mit Kolbenstange 73,83 und Förderkolben 72,82 in ihre eingeschobene bodenseitige Endlage. Der Schwerpunkt 98 der Autobetonpumpe wird in Richtung Vorderachse 13 verlagert. Fig. 3a The feed pressure generated by the feed pump 45, which is set to, for example, 34 bar, abuts against the rod side of the drive cylinders 7, 8. Through the valve 90, the rocking oil is discharged at the bottom end of the drive cylinder 7,8 in the storage tank 60. As a result, the drive pistons 71, 81 with piston rod 73, 83 and delivery piston 72, 82 reach their inserted bottom end position. The center of gravity 98 of the truck-mounted concrete pump is displaced in the direction of the front axle 13.

Fig. 3b: Mit dem Ventil 92 wird eine Verbindung zwischen der Speisepumpe 45 und der Schaukelölleitung 56 geschaffen. Der von der Speisepumpe 45 erzeugte Druck liegt daher in beiden Antriebszylindern 7,8 auf beiden Seiten des Antriebskolbens 71,81 an. Durch die Flächenverhältnisse der bodenseitigen und stangenseitigen Kolbenflächen der Antriebskolben 71,81 werden die Antriebskolben mit Kolbenstange 73,83 und Förderkolben 72,82 in Richtung stangenseitiges Zylinderende verschoben. Wir erhalten daher eine Verlagerung des Schwerpunks 98 in Richtung Hinterachse 18. Fig. 3b With the valve 92, a connection between the feed pump 45 and the swing oil line 56 is created. The pressure generated by the feed pump 45 is therefore in both drive cylinders 7,8 on both sides of the drive piston 71,81. Due to the area ratios of the bottom-side and rod-side piston surfaces of the drive piston 71,81, the drive piston with piston rod 73,83 and delivery piston 72,82 are moved towards rod-side cylinder end. We therefore receive a shift of the Schwerpunks 98 in the direction of the rear axle 18th

Fig. 3c: Hier liegt der Speisedruck der Speisepumpe 45 auf der Bodenseite der Antriebskolben 71,81 an. Dadurch lassen sich die Antriebskolben nicht mit Hilfe der Speisepumpe 45 allein zurückschieben. Durch eine Hilfspumpe 68, z.B. eine Rührwerkspumpe und ein Wegeventil 94 wird in die Schaukelölleitung extern Öl zugespeist. Wenn die über die Hilfspumpe 68 an der Stangenseite der Antriebskolben 71,81 aufgebaute Kraft größer ist als die sich aus dem Übersetzungsverhältnis der Antriebskolben 71,81 ergebende Kraft der Speisepumpe 45 gelangen die Antriebskolben 71,81 samt Kolbenstange 73,83 und Förderkolben 72,82 in die eingezogene bodenseitige Endlage. Die Schwerpunktverlagerung erfolgt in diesem Falle in Richtung Vorderachse 13. Zur Druckabsicherung der Hilfspumpe 68 ist ein zusätzliches Druckbegrenzungsventil 96 vorgesehen, dessen Begrenzungswert (ca. 200 bar) höher liegt als der des Druckbegrenzungsventils 62 der Speisepumpe 45 (ca. 34 bar). Fig. 3c : Here is the feed pressure of the feed pump 45 on the bottom side of the drive piston 71,81. As a result, the drive piston can not be pushed back by means of the feed pump 45 alone. By means of an auxiliary pump 68, for example an agitator pump and a directional control valve 94, oil is fed externally into the rocker oil line. When the force built up via the auxiliary pump 68 on the rod side of the drive pistons 71, 81 is greater than the force of the feed pump 45 resulting from the transmission ratio of the drive pistons 71, 81, the drive pistons 71, 81 together with the piston rod 73, 83 and delivery pistons 72, 82 reach in the retracted bottom end position. The center of gravity shift takes place in this case in the direction of the front axle 13. For pressure protection of the auxiliary pump 68, an additional pressure limiting valve 96 is provided whose limiting value (about 200 bar) is higher than that of the pressure limiting valve 62 of the feed pump 45 (about 34 bar).

Fig. 3d: Durch das Ventil 95 wird hier die Schaukelölleitung 56 mit der antriebsseitigen Hauptleitung 54 verbunden. Aufgrund der Flächenverhältnisse zwischen bodenseitiger und stangenseitiger Kolbenfläche in den Antriebszylindern 7,8 werden die Antriebskolben 71,81 samt Kolbenstangen 73,83 und Förderkolben 72,82 in Richtung bodenseitiges Ende der Antriebszylinder 7,8 verschoben. Wir erhalten dadurch eine Schwerpunktverlagerung in Richtung Hinterachse 18. Fig. 3d : Through the valve 95, the swing oil line 56 is connected to the drive-side main line 54 here. Due to the area ratios between the bottom-side and rod-side piston surface in the drive cylinders 7.8, the drive pistons 71, 81 together with piston rods 73, 83 and delivery pistons 72, 82 are displaced in the direction of the bottom end of the drive cylinders 7, 8. This gives us a shift of emphasis towards the rear axle 18.

Die vorstehend im Zusammenhang mit den Fig. 3a bis d beschriebenen Maßnahmen zeigen, dass mit überschaubarem schaltungstechnischem Aufwand die Antriebskolben 71,81 mit ihren Kolbenstangen 73,83 und Förderkolben 72,82 im Fahrzustand in eine gemeinsame definierte Endstellung verfahren werden können. Nach Bedarf kann dadurch eine erwünschte Schwerpunktverlagerung in Richtung Vorderachse 13 oder Hinterachse 18 erzielt werden. Wenn man dazuhin berücksichtigt, dass bei ausgefahrenen Antriebskolben 71,81 mehr Öl und bei eingefahrenen Antriebskolben weniger Öl in der Kernpumpe 24 verbleibt und sich der Öltank 60 des Hydrauliksystems regelmäßig vor der Kernpumpe 24 befindet, kann hierdurch die Schwerpunktverlagerung zusätzlich verstärkt werden. Mit den erfindungsgemäßen Maßnahmen können daher in Grenzfällen eventuell erforderliche Achslastvorschriften für eine Verkehrszulassung erfüllt werden.The above in connection with the Fig. 3a to d described measures show that with manageable circuit complexity, the drive piston 71,81 can be moved with their piston rods 73,83 and delivery piston 72,82 in the driving state in a common defined end position. As required, a desired center of gravity displacement in the direction of the front axle 13 or rear axle 18 can be achieved. Taking into account that when the drive piston 71.81 more oil and with retracted drive piston less oil in the core pump 24 remains and the oil tank 60 of the hydraulic system is regularly in front of the core pump 24, thereby the center of gravity displacement can be additionally strengthened. With the measures according to the invention, therefore, possibly required axle load regulations for traffic approval can be met in borderline cases.

Zusammenfassend ist folgendes festzuhalten: Die Erfindung bezieht sich auf ein Verfahren für den Einsatz einer fahrbaren Betonpumpe, bei welcher zwei Förderzylinder 70,80, deren Förderkolben 72,82 über je eine gemeinsame Kolbenstange 73,83 starr mit dem Antriebskolben 71,81 eines zugehörigen Antriebszylinders 7,8 verbunden sind. Im Betriebszustand werden die Förderkolben 72,82 mittels einer hydraulischen Pumpanordnung 44,45 unter Förderung von Beton aus einem Materialaufgabebehälter 32 in eine Förderleitung 50 im Gegentakt angetrieben, indem die Antriebskolben 71,81 in ihren Arbeitszylindern 7,8 zwischen ihren stangenseitigen und bodenseitigen Endlagen gegensinnig hin und her bewegt werden. Um im Transportzustand mit einfachen Mitteln eine Schwerpunktverlagerung in Richtung Vorderachse 13 oder Hinterachse 18 durchführen zu können, wird gemäß der Erfindung vorgeschlagen, dass die Antriebskolben 71,81 im Transportzustand der Betonpumpe gemeinsam in ihre bodenseitige oder in ihre stangenseitige Endlage bewegt und dort angehalten werden.In summary, the following should be noted: The invention relates to a method for the use of a mobile concrete pump, in which two delivery cylinder 70,80, the delivery piston 72,82 via a respective common piston rod 73,83 rigidly with the drive piston 71,81 of an associated drive cylinder 7.8 are connected. In operation, the delivery pistons 72,82 driven by a hydraulic pumping assembly 44,45 while conveying concrete from a material feed tank 32 in a feed line 50 in push-pull by the drive piston 71,81 are moved in their working cylinders 7,8 between their rod-side and bottom end positions in opposite directions back and forth , In order to be able to carry out a center of gravity displacement in the transport state in the direction of the front axle 13 or rear axle 18, it is proposed according to the invention that the drive pistons 71, 81 in the transport state of the concrete pump are moved together in their bottom-side or in their rod-side end position and stopped there.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

7,87.8
Antriebszylinderdrive cylinder
1010
LKW-ChassisTruck chassis
1212
Fahrgestellchassis
1313
VorderachseFront
1414
Führerhauscabin
1616
Antriebsstrangpowertrain
1818
Hinterachsenrear axles
2020
Betonpumpeconcrete pump
2222
Aufbaurahmenmounting frame
2424
Kernpumpecore pump
2828
Wasserkastencistern
3232
MaterialaufgabebehälterMaterial feed container
3434
DruckförderleitungPressure feed line
3636
Verteilermastplacing boom
3838
AbstützvorrichtungSupport device
4040
Stützbeinesupport legs
4242
Antriebsbaugruppedrive assembly
4343
MastdrehlagerbockMast pivot bracket
44,4544.45
Hydraulikpumpenhydraulic pumps
4646
MastauflagerbockMastauflagerbock
4848
Rohrweichediverter
5050
Förderleitungdelivery line
52,5452.54
Hauptleitungenmain lines
5656
SchaukelölleitungSwing oil line
5858
Wechselventilshuttle valve
6060
Tanktank
6262
DruckbegrenzungsventilPressure relief valve
64,6664.66
Rückschlagventilcheck valve
6868
Hilfspumpeauxiliary pump
70,8070,80
Förderzylinderdelivery cylinders
71,8171.81
Antriebskolbendrive piston
72,8272.82
Förderkolbendelivery piston
73,8373.83
Kolbenstangenpiston rods
74,8474.84
stirnseitige Öffnungenfrontal openings
90,92,9590,92,95
Ventilevalves
9494
Wegeventilway valve
9696
DruckegrenzungsventilDruckegrenzungsventil
9898
Schwerpunktmain emphasis

Claims (6)

  1. A method for using a mobile concrete pump, in which two delivery cylinders (70, 80), the delivery pistons (72, 82) of which are rigidly connected to the drive piston (71, 81) of an associated drive cylinder (7, 8) via in each case a common piston rod (73, 83), are driven in the operating state in a push-pull manner by means of a hydraulic pumping arrangement (44, 45), with the delivery of concrete from a material feed container (32) into a delivery line (50), and the drive pistons (71, 81) are here moved to and fro in opposite directions in their working cylinders (7, 8) between their rod-side and head-side end positions, wherein the drive cylinders (7, 8) in the operating state are connected at their one end alternately to a high-pressure side and a low-pressure side of the pumping arrangement (44, 45) via a main line (52, 54), and at their other end to each other via a swing oil line (56), and wherein the pumping arrangement comprises a main pump, which is configured as an adjustable reversing pump (44) and is disposed in a closed hydraulic circuit with the drive cylinders (7, 8), and a feed pump (45), which is connected on the pressure side to the main lines via check valves (64, 66) and on the inlet side to a storage tank (60), characterized in that the drive pistons (71, 81) in the transport state, under the influence of the pressure built up via the feed pump (45) in the zero setting of the adjustable reversing pump (44), are moved jointly into their rod-side end position, by the swing oil line (56) disposed on the rod side or the head side being connected via a branch line, which in the operating state can be shut off, to a main line (52, 54) of the hydraulic circuit.
  2. A method for using a mobile concrete pump, in which two delivery cylinders (70, 80), the delivery pistons (72, 82) of which are rigidly connected to the drive piston (71, 81) of an associated drive cylinder (7, 8) via in each case a common piston rod (73, 83), are driven in the operating state in a push-pull manner by means of a hydraulic pumping arrangement (44, 45), with the delivery of concrete from a material feed container (32) into a delivery line (50), and the drive pistons (71, 81) are here moved to and fro in opposite directions in their working cylinders (7, 8) between their rod-side and head-side end positions, wherein the drive cylinders (7, 8) in the operating state are connected at their one end alternately to a high-pressure side and a low-pressure side of the pumping arrangement (44, 45) via a main line (52, 54), and at their other end to each other via a swing oil line (56), and wherein the pumping arrangement comprises a main pump, which is configured as an adjustable reversing pump (44) and is disposed in a closed hydraulic circuit with the drive cylinders (7, 8), and a feed pump (45), which is connected on the pressure side to the main lines via check valves (64, 66) and on the inlet side to a storage tank (60), characterized in that the drive pistons (71, 81) in the transport state, under the influence of the pressure built up via the feed pump (45) in the zero setting of the adjustable reversing pump (44), are moved into their head-side end position, by the swing oil line (56) disposed on the head side being connected via a branch line, which in the operating state can be shut off, to the storage tank (60) standing under atmospheric pressure.
  3. A method for using a mobile concrete pump, in which two delivery cylinders (70, 80), the delivery pistons (72, 82) of which are rigidly connected to the drive piston (71, 81) of an associated drive cylinder (7, 8) via in each case a common piston rod (73, 83), are driven in the operating state in a push-pull manner by means of a hydraulic pumping arrangement (44, 45), with the delivery of concrete from a material feed container (32) into a delivery line (50), and the drive pistons (71, 81) are here moved to and fro in opposite directions in their working cylinders (7, 8) between their rod-side and head-side end positions, wherein the drive cylinders (7, 8) in the operating state are connected at their one end alternately to a high-pressure side and a low-pressure side of the pumping arrangement (44, 45) via a main line (52, 54), and at their other end to each other via a swing oil line (56), and wherein the pumping arrangement comprises a main pump, which is configured as an adjustable reversing pump (44) and is disposed in a closed hydraulic circuit with the drive cylinders (7, 8), and a feed pump (45), which is connected on the pressure side to the main lines via check valves (64, 66) and on the inlet side to a storage tank (60), characterized in that the drive pistons (71, 81) in the transport state, under the influence of the pressure set via the feed pump (45) in the zero setting of the adjustable reversing pump (44), on the one hand, and of an additional auxiliary pump (68), on the other hand, are moved jointly into their head-side end position, wherein the swing oil line (56) disposed on the rod side is connected via a branch line, which in the operating state can be shut off, to the additional auxiliary pump (68).
  4. A mobile concrete pump, in which two delivery cylinders (70, 80), the delivery pistons (72, 82) of which are rigidly connected to the drive piston (71, 81) of an associated drive cylinder (7, 8) via in each case a common piston rod (73, 83), can be driven in the operating state in a push-pull manner by means of a hydraulic pumping arrangement (44, 45), with the delivery of concrete from a material feed container (32) into a delivery line (50), and the drive pistons (71, 81) can here be moved to and fro in opposite directions in their working cylinders (7, 8) between their rod-side and head-side end positions, wherein the drive cylinders (7, 8) in the operating state can be connected at their one end, via a main line (52, 54), alternately to a high-pressure side and a low-pressure side of the pumping arrangement (44, 45) and, at their other end, communicate with each other via a swing oil line (56), and wherein the pumping arrangement comprises a main pump, which is configured as an adjustable reversing pump (44) and is disposed in a closed hydraulic circuit with the drive cylinders (7, 8), and a feed pump (45), which is connected on the pressure side to the main lines via check valves (64, 66) and on the inlet side to a storage tank (60), characterized in that the swing oil line (56) disposed on the rod side or the head side can be connected in the transport state via a branch line, which in the operating state can be shut off, to a main line (52, 54) of the hydraulic circuit, whereby the drive pistons (71, 81) in the transport state, under the influence of the pressure built up via the feed pump (45) in the zero setting of the adjustable reversing pump (44), can be moved into their rod-side end position.
  5. A mobile concrete pump, in which two delivery cylinders (70, 80), the delivery pistons (72, 82) of which are rigidly connected to the drive piston (71, 81) of an associated drive cylinder (7, 8) via in each case a common piston rod (73, 83), can be driven in the operating state in a push-pull manner by means of a hydraulic pumping arrangement (44, 45), with the delivery of concrete from a material feed container (32) into a delivery line (50), and the drive pistons (71, 81) can here be moved to and fro in opposite directions in their working cylinders (7, 8) between their rod-side and head-side end positions, wherein the drive cylinders (7, 8) in the operating state can be connected at their one end, via a main line (52, 54), alternately to a high-pressure side and a low-pressure side of the pumping arrangement (44, 45) and, at their other end, communicate with each other via a swing oil line (56), and wherein the pumping arrangement comprises a main pump, which is configured as an adjustable reversing pump (44) and is disposed in a closed hydraulic circuit with the drive cylinders (7, 8), and a feed pump (45), which is connected on the pressure side to the main lines via check valves (64, 66) and on the inlet side to a storage tank (60), characterized in that the swing oil line (56) disposed on the head side can be connected via a branch line, which in the operating state can be shut off, to the storage tank (60) standing under atmospheric pressure, whereby the drive pistons (71, 81) in the transport state, under the influence of the pressure built up via the feed pump (45) in the zero setting of the adjustable reversing pump (44), can be moved into their head-side end position.
  6. A mobile concrete pump, in which two delivery cylinders (70, 80), the delivery pistons (72, 82) of which are rigidly connected to the drive piston (71, 81) of an associated drive cylinder (7, 8) via in each case a common piston rod (73, 83), can be driven in the operating state in a push-pull manner by means of a hydraulic pumping arrangement (44, 45), with the delivery of concrete from a material feed container (32) into a delivery line (50), and the drive pistons (71, 81) can here be moved to and fro in opposite directions in their working cylinders (7, 8) between their rod-side and head-side end positions, wherein the drive cylinders (7, 8) in the operating state can be connected at their one end, via a main line (52, 54), alternately to a high-pressure side and a low-pressure side of the pumping arrangement (44, 45) and, at their other end, communicate with each other via a swing oil line (56), and wherein the pumping arrangement comprises a main pump, which is configured as an adjustable reversing pump (44) and is disposed in a closed hydraulic circuit with the drive cylinders (7, 8), and a feed pump (45), which is connected on the pressure side to the main lines via check valves (64, 66) and on the inlet side to a storage tank (60), characterized in that the swing oil line (56) disposed on the rod side is connected via a branch line, which in the operating state can be shut off, to an additional auxiliary pump (68), whereby the drive pistons (71, 81) in the transport state, under the influence of the pressure built up via the feed pump (45) in the zero setting of the adjustable reversing pump (44), on the one hand, and via the auxiliary pump (68), on the other hand, can be moved jointly into their head-side end position.
EP13726559.1A 2012-06-29 2013-06-05 Movable concrete pump and method for use thereof in the transport state Active EP2867531B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012211367.3A DE102012211367A1 (en) 2012-06-29 2012-06-29 Mobile concrete pump and method for its use in the transport state
PCT/EP2013/061532 WO2014001040A1 (en) 2012-06-29 2013-06-05 Mobile concrete pump and method for using it in the transport state

Publications (2)

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EP2867531A1 EP2867531A1 (en) 2015-05-06
EP2867531B1 true EP2867531B1 (en) 2016-08-03

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EP (1) EP2867531B1 (en)
JP (1) JP6122954B2 (en)
KR (1) KR102054027B1 (en)
CN (1) CN104302911B (en)
BR (1) BR112014024995B1 (en)
DE (1) DE102012211367A1 (en)
WO (1) WO2014001040A1 (en)

Cited By (2)

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WO2020193601A1 (en) 2019-03-27 2020-10-01 Putzmeister Engineering Gmbh Apparatus for output of a fluid process material
DE102023110126B3 (en) 2023-04-20 2024-05-08 Putzmeister Engineering Gmbh Thick matter pump and method for operating a thick matter pump

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DE102013225229A1 (en) * 2013-12-09 2015-06-11 Putzmeister Engineering Gmbh Truck-mounted concrete pump with a mast support unit for a distribution boom
DE102018208263A1 (en) * 2018-05-25 2019-11-28 Putzmeister Engineering Gmbh Device for conveying thick matter
CN110043438A (en) * 2019-05-24 2019-07-23 徐州徐工施维英机械有限公司 Pasty material conveying device and engineering truck

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JPS5936706Y2 (en) * 1979-04-06 1984-10-09 株式会社新潟鐵工所 Closed circuit for double cylinder drive in concrete pump
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WO2020193601A1 (en) 2019-03-27 2020-10-01 Putzmeister Engineering Gmbh Apparatus for output of a fluid process material
DE102019107833A1 (en) * 2019-03-27 2020-10-01 Putzmeister Engineering Gmbh Device for dispensing a fluid process material
DE102023110126B3 (en) 2023-04-20 2024-05-08 Putzmeister Engineering Gmbh Thick matter pump and method for operating a thick matter pump

Also Published As

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WO2014001040A1 (en) 2014-01-03
DE102012211367A1 (en) 2014-01-02
CN104302911A (en) 2015-01-21
KR20150032932A (en) 2015-03-31
BR112014024995A2 (en) 2017-06-20
EP2867531A1 (en) 2015-05-06
KR102054027B1 (en) 2019-12-09
JP6122954B2 (en) 2017-04-26
CN104302911B (en) 2016-10-26
BR112014024995B1 (en) 2021-10-13
JP2015521714A (en) 2015-07-30

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