EP3660304B1 - Two-cylinder slurry pump - Google Patents

Two-cylinder slurry pump Download PDF

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Publication number
EP3660304B1
EP3660304B1 EP19212083.0A EP19212083A EP3660304B1 EP 3660304 B1 EP3660304 B1 EP 3660304B1 EP 19212083 A EP19212083 A EP 19212083A EP 3660304 B1 EP3660304 B1 EP 3660304B1
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EP
European Patent Office
Prior art keywords
hydraulic
pump
control block
thick matter
hydraulic pump
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Application number
EP19212083.0A
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German (de)
French (fr)
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EP3660304A1 (en
Inventor
Johannes Fetzer
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Liebherr Mischtecknik GmbH
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Liebherr Mischtecknik GmbH
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Publication of EP3660304A1 publication Critical patent/EP3660304A1/en
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Classifications

    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
    • F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor
    • 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
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F04B7/0026—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an oscillating movement
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
    • F04B9/1176—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
    • F04B9/1178—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
    • 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
    • F04B2015/026—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 with a priming plunger or piston ahead of the pumping piston and connected on the same piston rod

Definitions

  • the invention relates to a two-cylinder thick matter pump, in particular for pumping concrete according to the preamble of claim 1.
  • Two-cylinder thick matter pumps usually comprise two delivery cylinders, which are linked to one another in terms of circuitry and their movement sequence is synchronized in such a way that when one delivery cylinder is pumping, the other delivery cylinder performs a suction stroke. At the end of each stroke, the direction of movement of the cylinder piston is reversed so that there is a constant change between pumping and suction strokes.
  • the suction stroke is used to convey a thick matter such as concrete into the respective suction cylinder.
  • a thick matter such as concrete into the respective suction cylinder.
  • the previously sucked in thick matter is pressed out of the now pumping delivery cylinder into a delivery line. So that this process always takes place in the correct manner, there is usually a diverter valve which can be moved back and forth between two switching end positions in order to establish the correct connection between the feed cylinder opening, the feed line connection and the thick matter feed.
  • the transfer tube is usually swiveled back and forth between two end positions by hydraulically driven swivel cylinders, in which they establish the necessary connection between the cylinder openings of the feed cylinder and the feed line connection or the thick matter feed.
  • One end of the transfer tube is constantly connected to the delivery line, while the other end covers the cylinder opening of the delivery cylinder that is currently pumping.
  • the cylinder opening of the suction cylinder is thus open to a pre-filling container from which the thick matter is sucked in.
  • the drive cylinders driving the delivery cylinders are typically operated hydraulically in the prior art.
  • open hydraulic circuits cf. Figure 1
  • closed hydraulic circuits cf. Figure 2
  • the document DE 10 2013 0063333 discloses a concrete pump, the back pressure of which is generated via a valve which is integrated in the closed feed pressure circuit.
  • a typical open hydraulic circuit 10 which hydraulically drives the two drive cylinders 12 of the delivery cylinders (not shown) of a two-cylinder thick matter pump.
  • the hydraulic pump 18 is shown as an adjustable hydraulic pump 18 conveying in one direction.
  • the hydraulic pump 18 delivers to the pressure side of a control block 20 in which, as is usually provided, a 4/3-way valve 22 is arranged. Since this is an open hydraulic circuit 10, the returning hydraulic oil is conducted from the control block 20 via an oil filter 24 into a hydraulic tank 26.
  • the switching of the piston strokes of the two drive cylinders 12 takes place in a purely hydraulic sequence control. It is characterized by its simplicity and the simple components.
  • the required hydraulic oil volume depends crucially on how much hydraulic oil is passed through the hydraulic tank 26, since the hydraulic oil must be calmed in the tank 26 by the oil volume before it is fed back into the hydraulic circuit 10.
  • a relatively large hydraulic tank 26 is therefore due to the high hydraulic oil flow required.
  • the entire system is therefore extremely maintenance-intensive due to the hydraulic tank 26 which is necessarily large in size.
  • the control block 20 has a comparatively heavy structure and is large in size.
  • FIG. 1 An alternative control of the drive cylinder 12 via a closed hydraulic circuit 10, as is also known from the prior art, is illustrated below by way of example with reference to FIG Figure 2 explained.
  • a hydraulic tandem pump 18 which, however, is designed as an adjustable hydraulic pump with two conveying directions, since it serves to control the switching of the piston strokes of the drive cylinders 12 by changing the conveying direction of the pump 18 (reversing).
  • the closed hydraulic circuit 10 also has a discharge valve 27, via which part of the hydraulic oil can be diverted into a hydraulic tank 26 via an oil filter 24.
  • the hydraulic oil removed from the closed hydraulic circuit 10, which also includes the leakage oil, is fed back to the hydraulic circuit 10 via two check valves 16 by an additionally provided feed pump 19 from the tank 26. Since the reversal of direction of the drive cylinder 12 takes place here by reversing, ie the change in direction of the hydraulic tandem pump 18, in this system switching of the piston stroke directions is only possible with an electrical sequence control.
  • the closed hydraulic circuit 10 has the advantage that only a small hydraulic oil volume and thus a smaller hydraulic tank 26 is required and that there is no main control block. There is also no limit to the size of the pump and the hydraulic filter 24 can be made comparatively small. On the other hand, it is disadvantageous that the additionally provided feed pump 19 has to feed the hydraulic oil to be fed in at a very high pressure level of, for example, 30 bar. This means that very expensive components are required here, and the entire system is very complex. A troubleshooting in the hydraulic system 10 or a setting of the hydraulic system 10 is enormously complex. Furthermore, the very frequently reversing pump 18 is subject to high loads or alternating loads and thus increased wear.
  • the object of the present invention is therefore to develop a generic two-cylinder thick matter pump in such a way that it can be operated in an energy-efficient manner and with a hydraulic circuit that is as simple and robust as possible and with the smallest possible hydraulic oil volume.
  • a two-cylinder thick matter pump in particular for conveying concrete, is provided in which two conveying cylinders alternately convey the thick matter through a suction line into a conveying line, the conveying cylinders being driven by hydraulically driven drive cylinders.
  • the two-cylinder thick matter pump is characterized in that the drive cylinders are connected via a control block to a first adjustable hydraulic pump delivering in one direction, the first hydraulic pump being connected on its pressure side to the high pressure side of the control block and on its suction side to the return port of the control block is that a second adjustable, one-way delivery hydraulic pump with a smaller delivery volume than the first hydraulic pump is provided, which is connected on its pressure side with the high pressure side of the control block and on its suction side with a hydraulic tank, the excess generated by the second hydraulic pump Hydraulic oil is discharged from the hydraulic circuit against a back pressure of a predetermined size to the hydraulic tank.
  • the hydraulic system basically has two adjustable hydraulic pumps, both of which deliver into the high-pressure side of the control block.
  • the larger first hydraulic pump can be selected from a type that is typically used in open hydraulic circuits.
  • the first hydraulic pump is therefore subject to a lower load and is therefore less susceptible to damage and more robust or more durable.
  • the first hydraulic pump is used in a closed hydraulic circuit.
  • the size of the smaller, second hydraulic pump roughly corresponds to the feed pump, as it was previously based on the in Figure 2 shown closed hydraulic circuit according to the prior art was explained.
  • the second hydraulic pump is used as an adjustable hydraulic pump in an open hydraulic circuit.
  • the closed hydraulic circuit is established in the first hydraulic pump in that its suction side is connected to the return connection of the control block.
  • the hydraulic circuit of the two-cylinder thick matter pump according to the invention combines the advantages of the closed and the open hydraulic circuit without the respective disadvantages.
  • the required hydraulic tank volume is reduced or essentially halved, namely in that only the smaller hydraulic pump sucks in from the hydraulic tank, but not the larger hydraulic pump.
  • the saving of hydraulic oil is a considerable economic advantage.
  • the system according to the invention stands out due to the use of simpler, more cost-effective and less damage-prone, one-sided conveying, ie non-reversing, hydraulic pumps, which also represents an economic advantage.
  • closed hydraulic circuits known from the prior art require a separate oil circuit for cooling the hydraulic oil, whereas in the system according to the invention cooling can be accommodated in the low-pressure area of the hydraulic circuit or on the low-pressure side of the control block.
  • the Indian The hydraulic circuit realized by the two-cylinder thick matter pump according to the invention also has the advantage that less cooling has to be carried out and comparatively little energy is destroyed, since a comparatively high hydraulic pressure remains in the closed hydraulic circuit of the first hydraulic pump.
  • the size ratio of the first hydraulic pump to the second hydraulic pump is approximately 5 to 1.
  • the dynamic pressure is generated by a valve which connects the return port of the control block with the hydraulic tank.
  • the dynamic pressure generated is 3 to 15 bar, in particular approx. 5 bar.
  • the valve thus makes it possible, for example, to keep the return pressure constant at approx. 5 bar.
  • an oil filter is present through which the hydraulic oil fed out of the hydraulic circuit is passed.
  • a 4/3-way valve for controlling the drive cylinder is arranged in the control block.
  • a cooling device for cooling the hydraulic oil is provided in the low pressure area between the return port of the control block and the suction side of the first hydraulic pump.
  • valve, the oil filter, the cooling device and the hydraulic tank are hydraulically connected to one another in series.
  • the excess hydraulic oil generated by the second hydraulic pump becomes discharged to the hydraulic tank via the valve, the oil filter and the oil cooler.
  • the reference numeral 10 designates the hydraulic circuit via which, on the one hand, two drive cylinders 12, each driving a delivery cylinder, are hydraulically controlled in such a way that the delivery cylinders (not shown) alternately transfer the thick matter, usually concrete, through a suction line into a delivery line (not shown) ) promote.
  • the drive cylinders 12 are supplied with hydraulic fluid, usually hydraulic oil, through a control block 20 and are hydraulically connected to one another for counter-synchronization of the piston strokes.
  • a 4/3-way valve 30 which is arranged in the control block 20 and which is supplied with hydraulic oil via an adjustable first hydraulic pump 18 which delivers in one direction is used for the hydraulic control of the drive cylinders 12. This is connected on its pressure side with the high pressure side of the control block 20 or the 4/3-way valve 30.
  • the suction side of the first hydraulic pump 18 is connected to the return connection of the control block 20 or the 4/3-way valve 30, so that the first hydraulic pump 18 is operated in a closed hydraulic circuit.
  • a second hydraulic pump 34 which is smaller in size by approximately one fifth, is provided, which also represents an adjustable hydraulic pump which delivers in one direction.
  • This is connected on its suction side to a hydraulic tank 26 in order to receive hydraulic oil from there and to the high pressure side of the control block 20 or into the high pressure line which connects the pressure side of the first hydraulic pump 18 with the high pressure connection of the control block 20 or the 4/3-way valve 30 connects to feed.
  • both adjustable hydraulic pumps 18, 34 delivering in one direction deliver to the high pressure side of the control block 20.
  • a valve 25 In the return line emerging from the control block 20 or the 4/3-way valve 30, a valve 25 generates a constant back pressure of 5 bar. Excess hydraulic oil is fed out of the return line against this back pressure of 5 bar via the valve 25 and an oil filter 24 to the hydraulic tank 26. The rest of the hydraulic oil that has not been discharged remains in the closed circuit and is conveyed to the high-pressure side of the control block 20 by the first hydraulic pump 18, at which a pressure of 25 bar is applied.
  • the hydraulic circuit 10 implemented here offers the advantage that comparatively little energy is destroyed.
  • a comparatively high hydraulic pressure of approximately 25 bar remains in the closed circuit of the first hydraulic pump 18.
  • the hydraulic oil does not have to be cooled as much.
  • the hydraulic pump 18 used here which only delivers in one direction, corresponds to a type of construction that can also be used in a typical open hydraulic circuit. This is cheaper to buy and operate than the hydraulic pumps that are usually used in closed circuits and operate in both directions. Overall, less hydraulic oil is required than in an open circuit.
  • the system is generally easy to install and comparatively easy to maintain.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)

Description

Die Erfindung betrifft eine Zweizylinder-Dickstoffpumpe insbesondere zur Förderung von Beton nach dem Oberbegriff des Anspruchs 1.The invention relates to a two-cylinder thick matter pump, in particular for pumping concrete according to the preamble of claim 1.

Zweizylinder-Dickstoffpumpen umfassen üblicherweise zwei Förderzylinder, welche schaltungstechnisch miteinander verknüpft und in ihrem Bewegungsablauf so synchronisiert sind, dass beim Pumpen des einen Förderzylinders der andere Förderzylinder einen Saughub ausführt. Am Ende jedes Hubes wird die Bewegungsrichtung des Zylinderkolbens jeweils umgesteuert, sodass ein ständiger Wechsel zwischen Pump- und Saughüben erfolgt.Two-cylinder thick matter pumps usually comprise two delivery cylinders, which are linked to one another in terms of circuitry and their movement sequence is synchronized in such a way that when one delivery cylinder is pumping, the other delivery cylinder performs a suction stroke. At the end of each stroke, the direction of movement of the cylinder piston is reversed so that there is a constant change between pumping and suction strokes.

Der Saughub dient dazu, einen Dickstoff wie Beton in den jeweils saugenden Förderzylinder zu fördern. Bei der darauffolgenden Pumpbewegung wird der zuvor angesaugte Dickstoff aus dem nunmehr pumpenden Förderzylinder in eine Förderleitung gedrückt. Damit dieser Vorgang stets in richtiger Art und Weise erfolgt, ist üblicherweise eine Rohrweiche vorhanden, welche zwischen zwei Schaltendstellungen hin- und herbewegbar ist, um die jeweils richtige Verbindung zwischen der Förderzylinderöffnung, dem Förderleitungsanschluss und der Dickstoffzuführung herzustellen.The suction stroke is used to convey a thick matter such as concrete into the respective suction cylinder. During the subsequent pumping movement, the previously sucked in thick matter is pressed out of the now pumping delivery cylinder into a delivery line. So that this process always takes place in the correct manner, there is usually a diverter valve which can be moved back and forth between two switching end positions in order to establish the correct connection between the feed cylinder opening, the feed line connection and the thick matter feed.

Die Rohrweiche wird üblicherweise durch hydraulisch angetriebene Schwenkzylinder zwischen zwei Endstellungen hin- und hergeschwenkt, in welchen sie die jeweils notwendige Verbindung zwischen den Zylinderöffnungen der Förderzylinder und dem Förderleitungsanschluss bzw. der Dickstoffzuführung herstellen. Dabei ist die Rohrweiche mit ihrem einen Ende ständig mit der Förderleitung verbunden, während das andere Ende jeweils die Zylinderöffnung des gerade pumpenden Förderzylinders überdeckt. Die Zylinderöffnung des Saugzylinders steht damit zu einem Vorfüllbehälter hin offen, aus dem der Dickstoff angesaugt wird.The transfer tube is usually swiveled back and forth between two end positions by hydraulically driven swivel cylinders, in which they establish the necessary connection between the cylinder openings of the feed cylinder and the feed line connection or the thick matter feed. One end of the transfer tube is constantly connected to the delivery line, while the other end covers the cylinder opening of the delivery cylinder that is currently pumping. The cylinder opening of the suction cylinder is thus open to a pre-filling container from which the thick matter is sucked in.

Die die Förderzylinder antreibenden Antriebszylinder werden typischerweise im Stand der Technik hydraulisch betrieben. Hierzu sind im Stand der Technik einerseits offene Hydraulikkreise (vgl. Figur 1) und andererseits geschlossene Hydraulikkreisläufe (vgl. Figur 2) bekannt.The drive cylinders driving the delivery cylinders are typically operated hydraulically in the prior art. On the one hand, open hydraulic circuits (cf. Figure 1 ) and on the other hand closed hydraulic circuits (cf. Figure 2 ) known.

Das Dokument DE 10 2013 0063333 offenbart eine Betonpumpe, deren Staudruck über ein Ventil erzeugt wird, welches in dem geschlossenen Speisedruckkreis integriert ist.The document DE 10 2013 0063333 discloses a concrete pump, the back pressure of which is generated via a valve which is integrated in the closed feed pressure circuit.

In der Figur 1 ist ein typischer offener Hydraulikkreislauf 10 dargestellt, der die beiden Antriebszylinder 12 der Förderzylinder (nicht dargestellt) einer Zweizylinder-Dickstoffpumpe hydraulisch antreibt. In dem in Figur 1 dargestellten offenen Kreis ist die Hydraulikpumpe 18 als verstellbare, in eine Richtung fördernde Hydraulikpumpe 18 dargestellt. Die Hydraulikpumpe 18 fördert auf die Druckseite eines Steuerblocks 20, in welchem, wie üblicherweise vorgesehen, ein 4/3-Wegeventil 22 angeordnet ist. Da es sich hierbei um einen offenen Hydraulikkreislauf 10 handelt, wird das rücklaufende Hydrauliköl vom Steuerblock 20 über einen Ölfilter 24 in einen Hydrauliktank 26 geleitet. Bei diesem System erfolgt das Umschalten der Kolbenhübe der beiden Antriebszylinder 12 in einer rein hydraulischen Folgesteuerung. Es zeichnet sich durch seine Einfachheit und durch die einfachen Komponenten aus. Allerdings ist ein vergleichsweise großes Hydraulikölvolumen notwendig. Das erforderliche Hydraulikölvolumen hängt hierbei entscheidend davon ab, wieviel Hydrauliköl über den Hydrauliktank 26 geschleust wird, da das Hydrauliköl vor Wiedereinspeisung in den Hydraulikkreislauf 10 im Tank 26 durch das Ölvolumen beruhigt werden muss. Bei einem offenen Hydraulikkreislauf 10 ist somit wegen des hohen Hydrauliköldurchflusses ein relativ groß dimensionierter Hydrauliktank 26 erforderlich. Das gesamte System ist daher aufgrund des notwendigerweise groß dimensionierten Hydrauliktanks 26 enorm wartungsintensiv. Der Steuerblock 20 ist vergleichsweise schwer aufgebaut und groß dimensioniert.In the Figure 1 a typical open hydraulic circuit 10 is shown, which hydraulically drives the two drive cylinders 12 of the delivery cylinders (not shown) of a two-cylinder thick matter pump. In the in Figure 1 The open circuit shown, the hydraulic pump 18 is shown as an adjustable hydraulic pump 18 conveying in one direction. The hydraulic pump 18 delivers to the pressure side of a control block 20 in which, as is usually provided, a 4/3-way valve 22 is arranged. Since this is an open hydraulic circuit 10, the returning hydraulic oil is conducted from the control block 20 via an oil filter 24 into a hydraulic tank 26. In this system, the switching of the piston strokes of the two drive cylinders 12 takes place in a purely hydraulic sequence control. It is characterized by its simplicity and the simple components. However, a comparatively large volume of hydraulic oil is necessary. The required hydraulic oil volume depends crucially on how much hydraulic oil is passed through the hydraulic tank 26, since the hydraulic oil must be calmed in the tank 26 by the oil volume before it is fed back into the hydraulic circuit 10. In the case of an open hydraulic circuit 10, a relatively large hydraulic tank 26 is therefore due to the high hydraulic oil flow required. The entire system is therefore extremely maintenance-intensive due to the hydraulic tank 26 which is necessarily large in size. The control block 20 has a comparatively heavy structure and is large in size.

Eine alternative Ansteuerung der Antriebszylinder 12 über einen geschlossenen Hydraulikkreis 10, wie er ebenfalls aus dem Stand der Technik bekannt ist, wird im Folgenden beispielhaft anhand der Figur 2 erläutert. Auch hier ist eine Hydrauliktandempumpe 18 vorhanden, welche allerdings als verstellbare Hydraulikpumpe mit zwei Förderrichtungen ausgebildet ist, da sie dazu dient, durch den Wechsel der Förderrichtung der Pumpe 18 (Reversieren) das Umschalten der Kolbenhübe der Antriebszylinder 12 zu steuern. In der hier dargestellten Ausführungsvariante ist folglich in dem die Antriebszylinder 12 antreibenden Hydraulikkreis 10 kein Steuerblock mehr vorhanden. An die Stelle des Steuerblocks tritt hier die Richtungsumkehr der Hydraulikpumpe 18. Der geschlossene Hydraulikkreislauf 10 weist darüber hinaus ein Ausspeiseventil 27 auf, über welches jeweils ein Teil des Hydrauliköls über einen Ölfilter 24 in einen Hydrauliktank 26 abgeleitet werden kann. Das aus dem geschlossenen Hydraulikkreislauf 10 entnommene Hydrauliköl, welches auch zusätzlich das Leckageöl umfasst, wird durch eine zusätzlich vorgesehene Speisepumpe 19 aus dem Tank 26 heraus über zwei Rückschlagventile 16 wieder dem Hydraulikkreislauf 10 zugeführt. Da hier die Richtungsumkehr der Antriebszylinder 12 durch das Reversieren, d.h. den Richtungswechsel der Hydrauliktandempumpe 18 erfolgt, ist bei diesem System ein Umschalten der Kolbenhubrichtungen nur mit einer elektrischen Folgesteuerung möglich.An alternative control of the drive cylinder 12 via a closed hydraulic circuit 10, as is also known from the prior art, is illustrated below by way of example with reference to FIG Figure 2 explained. Here, too, there is a hydraulic tandem pump 18, which, however, is designed as an adjustable hydraulic pump with two conveying directions, since it serves to control the switching of the piston strokes of the drive cylinders 12 by changing the conveying direction of the pump 18 (reversing). In the embodiment variant shown here, there is consequently no control block in the hydraulic circuit 10 driving the drive cylinder 12. Instead of the control block, the direction of the hydraulic pump 18 is reversed. The closed hydraulic circuit 10 also has a discharge valve 27, via which part of the hydraulic oil can be diverted into a hydraulic tank 26 via an oil filter 24. The hydraulic oil removed from the closed hydraulic circuit 10, which also includes the leakage oil, is fed back to the hydraulic circuit 10 via two check valves 16 by an additionally provided feed pump 19 from the tank 26. Since the reversal of direction of the drive cylinder 12 takes place here by reversing, ie the change in direction of the hydraulic tandem pump 18, in this system switching of the piston stroke directions is only possible with an electrical sequence control.

Der geschlossene Hydraulikkreislauf 10 hat den Vorteil, dass lediglich ein geringes Hydraulikölvolumen und somit ein kleiner dimensionierter Hydrauliktank 26 nötig ist und dass kein Hauptsteuerblock vorhanden ist. Es besteht hier auch keine Begrenzung der Pumpengröße und der Hydraulikfilter 24 kann vergleichsweise klein dimensioniert werden. Andererseits ist es nachteilig, dass die zusätzlich vorzusehende Speisepumpe 19 das einzuspeisende Hydrauliköl bei einem sehr hohen Druckniveau von beispielsweise 30 bar einspeisen muss. Dadurch werden hier recht teure Komponenten benötigt, das gesamte System ist sehr komplex. Eine Fehlersuche im Hydrauliksystem 10 bzw. eine Einstellung des Hydrauliksystems 10 gestaltet sich enorm aufwendig. Ferner unterliegt die sehr häufig reversierende Pumpe 18 einer hohen Beanspruchung bzw. Wechselbelastung und damit einem erhöhten Verschleiß.The closed hydraulic circuit 10 has the advantage that only a small hydraulic oil volume and thus a smaller hydraulic tank 26 is required and that there is no main control block. There is also no limit to the size of the pump and the hydraulic filter 24 can be made comparatively small. On the other hand, it is disadvantageous that the additionally provided feed pump 19 has to feed the hydraulic oil to be fed in at a very high pressure level of, for example, 30 bar. This means that very expensive components are required here, and the entire system is very complex. A troubleshooting in the hydraulic system 10 or a setting of the hydraulic system 10 is enormously complex. Furthermore, the very frequently reversing pump 18 is subject to high loads or alternating loads and thus increased wear.

Insbesondere bei mobilen Betonpumpen stellt das erforderliche Hydraulikölvolumen bezüglich des Gewichts eine entscheidende Größe dar, bei einem Ölwechsel auch für den Betreiber hinsichtlich der Kosten.In the case of mobile concrete pumps in particular, the required volume of hydraulic oil is a decisive factor in terms of weight, and in terms of costs for the operator when it comes to an oil change.

Aufgabe der vorliegenden Erfindung ist es daher, eine gattungsgemäße Zweizylinder-Dickstoffpumpe derart weiterzubilden, dass sie energieeffizient und mit einem möglichst einfach bauenden und robusten Hydraulikkreislauf mit möglichst geringem Hydraulikölvolumen betreibbar ist.The object of the present invention is therefore to develop a generic two-cylinder thick matter pump in such a way that it can be operated in an energy-efficient manner and with a hydraulic circuit that is as simple and robust as possible and with the smallest possible hydraulic oil volume.

Erfindungsgemäß wird diese Aufgabe durch die Kombination der Merkmale des Anspruchs 1 gelöst. Demnach wird eine Zweizylinder-Dickstoffpumpe, insbesondere zur Förderung von Beton, vorgesehen, bei der zwei Förderzylinder alternierend den Dickstoff durch eine Saugleitung in eine Förderleitung fördern, wobei die Förderzylinder über hydraulisch angetriebene Antriebszylinder angetrieben sind.According to the invention, this object is achieved by the combination of the features of claim 1. Accordingly, a two-cylinder thick matter pump, in particular for conveying concrete, is provided in which two conveying cylinders alternately convey the thick matter through a suction line into a conveying line, the conveying cylinders being driven by hydraulically driven drive cylinders.

Erfindungsgemäß ist die Zweizylinder-Dickstoffpumpe dadurch gekennzeichnet, dass die Antriebszylinder über einen Steuerblock mit einer ersten verstellbaren, in eine Richtung fördernden Hydraulikpumpe verbunden sind, wobei die erste Hydraulikpumpe auf ihrer Druckseite mit der Hochdruckseite des Steuerblocks und mit ihrer Saugseite mit dem Rücklaufanschluss des Steuerblocks verbunden ist, dass eine zweite verstellbare, in eine Richtung fördernde Hydraulikpumpe mit kleinerem Fördervolumen als die erste Hydraulikpumpe vorgesehen ist, welche auf ihrer Druckseite mit der Hochdruckseite des Steuerblocks und mit ihrer Saugseite mit einem Hydrauliktank verbunden ist, wobei das von der zweiten Hydraulikpumpe erzeugte, überschüssige Hydrauliköl aus dem Hydraulikkreislauf gegen einen Staudruck vorbestimmter Größe zum Hydrauliktank ausgespeist wird.According to the invention, the two-cylinder thick matter pump is characterized in that the drive cylinders are connected via a control block to a first adjustable hydraulic pump delivering in one direction, the first hydraulic pump being connected on its pressure side to the high pressure side of the control block and on its suction side to the return port of the control block is that a second adjustable, one-way delivery hydraulic pump with a smaller delivery volume than the first hydraulic pump is provided, which is connected on its pressure side with the high pressure side of the control block and on its suction side with a hydraulic tank, the excess generated by the second hydraulic pump Hydraulic oil is discharged from the hydraulic circuit against a back pressure of a predetermined size to the hydraulic tank.

Das Hydrauliksystem weist also grundsätzlich zwei verstellbare Hydraulikpumpen auf, welche beide in die Hochdruckseite des Steuerblocks fördern. Dabei ist die größere erste Hydraulikpumpe von einer Bauart wählbar, wie sie typischerweise in offenen Hydraulikkreisen verwendet wird. Die erste Hydraulikpumpe unterliegt somit einer geringeren Belastung und ist dadurch weniger schadensanfällig und robuster bzw. haltbarer. Entsprechend der vorliegenden Erfindung wird die erste Hydraulikpumpe aber in einem geschlossenen Hydraulikkreis verwendet. Die kleinere zweite Hydraulikpumpe entspricht in ihrer Baugröße ungefähr der Speisepumpe, wie sie zuvor anhand des in Figur 2 gezeigten geschlossenen Hydraulikkreislaufs nach dem Stand der Technik erläutert wurde. Die zweite Hydraulikpumpe wird erfindungsgemäß jedoch als eine verstellbare Hydraulikpumpe in einem offenen Hydraulikkreis eingesetzt. Der geschlossene Hydraulikkreislauf wird bei der ersten Hydraulikpumpe erfindungsgemäß dadurch hergestellt, dass deren Saugseite mit dem Rücklaufanschluss des Steuerblocks verbunden ist.The hydraulic system basically has two adjustable hydraulic pumps, both of which deliver into the high-pressure side of the control block. The larger first hydraulic pump can be selected from a type that is typically used in open hydraulic circuits. The first hydraulic pump is therefore subject to a lower load and is therefore less susceptible to damage and more robust or more durable. According to the present invention, however, the first hydraulic pump is used in a closed hydraulic circuit. The size of the smaller, second hydraulic pump roughly corresponds to the feed pump, as it was previously based on the in Figure 2 shown closed hydraulic circuit according to the prior art was explained. According to the invention, however, the second hydraulic pump is used as an adjustable hydraulic pump in an open hydraulic circuit. According to the invention, the closed hydraulic circuit is established in the first hydraulic pump in that its suction side is connected to the return connection of the control block.

Der Hydraulikkreislauf der erfindungsgemäßen Zweizylinder-Dickstoffpumpe vereint in sich die Vorteile des geschlossenen und des offenen Hydraulikkreislaufs ohne die jeweiligen Nachteile. Gegenüber dem offenen Hydraulikkreislauf wird das benötigte Hydrauliktankvolumen verringert bzw. im Wesentlichen halbiert, und zwar dadurch, dass lediglich die kleinere Hydraulikpumpe aus dem Hydrauliktank ansaugt, die größere Hydraulikpumpe jedoch nicht. Insbesondere bei gewichtskritischen Anwendungen, beispielsweise bei mobilen Betonpumpen mit Verteilermast, ist die Einsparung von Hydrauliköl von erheblichem ökonomischem Vorteil.The hydraulic circuit of the two-cylinder thick matter pump according to the invention combines the advantages of the closed and the open hydraulic circuit without the respective disadvantages. Compared to the open hydraulic circuit, the required hydraulic tank volume is reduced or essentially halved, namely in that only the smaller hydraulic pump sucks in from the hydraulic tank, but not the larger hydraulic pump. In particular in weight-critical applications, for example in mobile concrete pumps with placing booms, the saving of hydraulic oil is a considerable economic advantage.

Gegenüber einem geschlossenen Hydraulikkreislauf hebt sich das erfindungsgemäße System durch die Verwendung einfacherer, kostengünstigerer und weniger schadensanfälliger einseitig fördernder, d.h. nicht reversierender, Hydraulikpumpen ab, was ebenfalls einen ökonomischen Vorteil darstellt. Darüber hinaus benötigen aus dem Stand der Technik bekannte geschlossene Hydraulikkreisläufe einen separaten Ölkreislauf zur Kühlung des Hydrauliköls, wohingegen beim erfindungsgemäßen System eine Kühlung im Niederdruckbereich des Hydraulikkreislaufs bzw. auf der Niederdruckseite des Steuerblocks untergebracht werden kann. Der in der erfindungsgemäßen Zweizylinder-Dickstoffpumpe realisierte Hydraulikkreislauf hat ferner den Vorteil, dass weniger gekühlt werden muss und vergleichsweise wenig Energie vernichtet wird, da im geschlossenen Hydraulikkreis der ersten Hydraulikpumpe ein vergleichsweise hoher Hydraulikdruck verbleibt.Compared to a closed hydraulic circuit, the system according to the invention stands out due to the use of simpler, more cost-effective and less damage-prone, one-sided conveying, ie non-reversing, hydraulic pumps, which also represents an economic advantage. In addition, closed hydraulic circuits known from the prior art require a separate oil circuit for cooling the hydraulic oil, whereas in the system according to the invention cooling can be accommodated in the low-pressure area of the hydraulic circuit or on the low-pressure side of the control block. The Indian The hydraulic circuit realized by the two-cylinder thick matter pump according to the invention also has the advantage that less cooling has to be carried out and comparatively little energy is destroyed, since a comparatively high hydraulic pressure remains in the closed hydraulic circuit of the first hydraulic pump.

Vorteilhafte Ausführungsformen der Erfindung ergeben sich aus den sich an den Hauptanspruch anschließenden Unteransprüchen.Advantageous embodiments of the invention emerge from the subclaims that follow the main claim.

In einer Ausführungsform ist vorgesehen, dass das Größenverhältnis der ersten Hydraulikpumpe zur zweiten Hydraulikpumpe ca. 5 zu 1 ist.In one embodiment it is provided that the size ratio of the first hydraulic pump to the second hydraulic pump is approximately 5 to 1.

In einer weiteren Ausführungsform ist vorgesehen, dass der Staudruck von einem Ventil erzeugt wird, welches den Rücklaufanschluss des Steuerblocks mit dem Hydrauliktank verbindet.In a further embodiment it is provided that the dynamic pressure is generated by a valve which connects the return port of the control block with the hydraulic tank.

In einer weiteren Ausführungsform ist vorgesehen, dass der erzeugte Staudruck 3 bis 15 bar, insbesondere ca. 5 bar beträgt. Durch das Ventil ist es somit beispielsweise möglich, den Rücklaufdruck auf ca. 5 bar konstant zu halten.In a further embodiment it is provided that the dynamic pressure generated is 3 to 15 bar, in particular approx. 5 bar. The valve thus makes it possible, for example, to keep the return pressure constant at approx. 5 bar.

In einer weiteren Ausführungsform ist vorgesehen, dass ein Ölfilter vorhanden ist, über den das aus dem Hydraulikkreislauf ausgespeiste Hydrauliköl geführt wird.In a further embodiment it is provided that an oil filter is present through which the hydraulic oil fed out of the hydraulic circuit is passed.

In einer weiteren Ausführungsform ist vorgesehen, dass im Steuerblock ein 4/3-Wegeventil zur Ansteuerung der Antriebszylinder angeordnet ist.In a further embodiment it is provided that a 4/3-way valve for controlling the drive cylinder is arranged in the control block.

In einer weiteren Ausführungsform ist vorgesehen, dass im Niederdruckbereich zwischen dem Rücklaufanschluss des Steuerblocks und der Saugseite der ersten Hydraulikpumpe eine Kühleinrichtung zur Kühlung des Hydrauliköls vorgesehen ist.In a further embodiment it is provided that a cooling device for cooling the hydraulic oil is provided in the low pressure area between the return port of the control block and the suction side of the first hydraulic pump.

In einer weiteren Ausführungsform ist vorgesehen, dass das Ventil, der Ölfilter, die Kühleinrichtung und der Hydrauliktank seriell miteinander hydraulisch verbunden sind. Somit wird das von der zweiten Hydraulikpumpe erzeugte überschüssige Hydrauliköl über das Ventil, den Ölfilter und den Ölkühler zum Hydrauliktank ausgeleitet.In a further embodiment it is provided that the valve, the oil filter, the cooling device and the hydraulic tank are hydraulically connected to one another in series. Thus, the excess hydraulic oil generated by the second hydraulic pump becomes discharged to the hydraulic tank via the valve, the oil filter and the oil cooler.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung werden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

Figur 1:
einen offenen Hydraulikkreislauf zum Betreiben einer ZweizylinderDickstoffpumpe nach dem Stand der Technik;
Figur 2:
einen geschlossenen Hydraulikkreislauf zum Betreiben einer Zweizylinder-Dickstoffpumpe nach dem Stand der Technik; und
Figur 3:
ein Ausführungsbeispiel eines Hydraulikkreislaufs zum Betreiben einer Zweizylinder-Dickstoffpumpe gemäß der vorliegenden Erfindung.
Further features, details and advantages of the invention are explained in more detail using an exemplary embodiment shown in the drawing. Show it:
Figure 1:
an open hydraulic circuit for operating a prior art two cylinder nitrogen pump;
Figure 2:
a closed hydraulic circuit for operating a two-cylinder thick matter pump according to the prior art; and
Figure 3:
an embodiment of a hydraulic circuit for operating a two-cylinder thick matter pump according to the present invention.

In der Figur 3 ist eine Ausführungsform der erfindungsgemäßen Zweizylinder-Dickstoffpumpe gezeigt. Mit dem Bezugszeichen 10 ist der Hydraulikkreis bezeichnet, über den zum einen zwei jeweils einen Förderzylinder antreibende Antriebszylinder 12 derartig hydraulisch angesteuert werden, dass die Förderzylinder (nicht dargestellt) alternierend den Dickstoff, in der Regel Beton, durch eine Saugleitung in eine Förderleitung (nicht dargestellt) fördern.In the Figure 3 an embodiment of the two-cylinder thick matter pump according to the invention is shown. The reference numeral 10 designates the hydraulic circuit via which, on the one hand, two drive cylinders 12, each driving a delivery cylinder, are hydraulically controlled in such a way that the delivery cylinders (not shown) alternately transfer the thick matter, usually concrete, through a suction line into a delivery line (not shown) ) promote.

Die Antriebszylinder 12 werden durch einen Steuerblock 20 mit Hydraulikflüssigkeit, in der Regel Hydrauliköl, versorgt und sind zur Gegensynchronisation der Kolbenhübe untereinander hydraulisch verbunden. Zur hydraulischen Ansteuerung der Antriebszylinder 12 dient ein in dem Steuerblock 20 angeordnetes 4/3-Wegeventil 30, welches über eine verstellbare, in eine Richtung fördernde erste Hydraulikpumpe 18 mit Hydrauliköl versorgt wird. Diese ist auf ihrer Druckseite mit der Hochdruckseite des Steuerblocks 20 bzw. des 4/3-Wegeventils 30 verbunden. Die Saugseite der ersten Hydraulikpumpe 18 ist mit dem Rücklaufanschluss des Steuerblocks 20 bzw. des 4/3-Wegeventils 30 verbunden, so dass die erste Hydraulikpumpe 18 in einem geschlossenen Hydraulikkreislauf gefahren wird.The drive cylinders 12 are supplied with hydraulic fluid, usually hydraulic oil, through a control block 20 and are hydraulically connected to one another for counter-synchronization of the piston strokes. A 4/3-way valve 30 which is arranged in the control block 20 and which is supplied with hydraulic oil via an adjustable first hydraulic pump 18 which delivers in one direction is used for the hydraulic control of the drive cylinders 12. This is connected on its pressure side with the high pressure side of the control block 20 or the 4/3-way valve 30. The suction side of the first hydraulic pump 18 is connected to the return connection of the control block 20 or the 4/3-way valve 30, so that the first hydraulic pump 18 is operated in a closed hydraulic circuit.

Parallel zur ersten Hydraulikpumpe 18 ist eine in ihrer Größe um ca. ein Fünftel kleinere zweite Hydraulikpumpe 34 vorgesehen, welche ebenfalls eine verstellbare, in eine Richtung fördernde Hydraulikpumpe darstellt. Diese ist auf ihrer Saugseite mit einem Hydrauliktank 26 verbunden, um von dort Hydrauliköl aufzunehmen und auf die Hochdruckseite des Steuerblocks 20 bzw. in die Hochdruckleitung, welche die Druckseite der ersten Hydraulikpumpe 18 mit dem Hochdruckanschluss des Steuerblocks 20 bzw. des 4/3-Wegeventils 30 verbindet, einzuspeisen. Somit fördern beide verstellbaren, in eine Richtung fördernden Hydraulikpumpen 18, 34 auf die Hochdruckseite des Steuerblocks 20.In parallel with the first hydraulic pump 18, a second hydraulic pump 34, which is smaller in size by approximately one fifth, is provided, which also represents an adjustable hydraulic pump which delivers in one direction. This is connected on its suction side to a hydraulic tank 26 in order to receive hydraulic oil from there and to the high pressure side of the control block 20 or into the high pressure line which connects the pressure side of the first hydraulic pump 18 with the high pressure connection of the control block 20 or the 4/3-way valve 30 connects to feed. Thus, both adjustable hydraulic pumps 18, 34 delivering in one direction deliver to the high pressure side of the control block 20.

In der aus dem Steuerblock 20 bzw. dem 4/3-Wegeventil 30 austretenden Rücklaufleitung wird durch ein Ventil 25 ein konstanter Staudruck in Höhe von 5 bar erzeugt. Überschüssiges Hydrauliköl wird aus der Rücklaufleitung gegen diesen Staudruck von 5 bar über das Ventil 25 und einen Ölfilter 24 zum Hydrauliktank 26 hin ausgespeist. Der nichtausgespeiste Rest des Hydrauliköls verbleibt in dem geschlossenen Kreislauf und wird von der ersten Hydraulikpumpe 18, bei welcher ein Druck von 25 bar anliegt, auf die Hochdruckseite des Steuerblocks 20 gefördert.In the return line emerging from the control block 20 or the 4/3-way valve 30, a valve 25 generates a constant back pressure of 5 bar. Excess hydraulic oil is fed out of the return line against this back pressure of 5 bar via the valve 25 and an oil filter 24 to the hydraulic tank 26. The rest of the hydraulic oil that has not been discharged remains in the closed circuit and is conveyed to the high-pressure side of the control block 20 by the first hydraulic pump 18, at which a pressure of 25 bar is applied.

Der hier realisierte Hydraulikkreislauf 10 bietet den Vorteil, dass vergleichsweise wenig Energie vernichtet wird. Im geschlossenen Kreis der ersten Hydraulikpumpe 18 verbleibt ein vergleichsweise hoher Hydraulikdruck von etwa 25 bar. Das Hydrauliköl muss nicht so stark gekühlt werden. Die hier verwendete nur in eine Richtung fördernde Hydraulikpumpe 18 entspricht einer Bauart, wie sie auch in einem typischen offenen Hydraulikkreis verwendet werden kann. Diese ist in ihrer Anschaffung und im Betrieb günstiger als die üblicherweise in geschlossenen Kreisläufen verwendeten, in beide Richtungen wirkenden Hydraulikpumpen. Insgesamt wird auch weniger Hydrauliköl benötigt als in einem offenen Kreislauf. Das System ist generell einfach zu installieren und vergleichsweise einfach zu warten.The hydraulic circuit 10 implemented here offers the advantage that comparatively little energy is destroyed. A comparatively high hydraulic pressure of approximately 25 bar remains in the closed circuit of the first hydraulic pump 18. The hydraulic oil does not have to be cooled as much. The hydraulic pump 18 used here, which only delivers in one direction, corresponds to a type of construction that can also be used in a typical open hydraulic circuit. This is cheaper to buy and operate than the hydraulic pumps that are usually used in closed circuits and operate in both directions. Overall, less hydraulic oil is required than in an open circuit. The system is generally easy to install and comparatively easy to maintain.

Bezugszeichenliste:List of reference symbols:

1010
HydraulikkreislaufHydraulic circuit
1212th
AntriebszylinderDrive cylinder
1616
RückstoßventilCheck valve
1818th
Erste HydraulikpumpeFirst hydraulic pump
1919th
SpeisepumpeFeed pump
2020th
SteuerblockControl block
2222nd
4/3-Wegeventil4/3-way valve
2424
ÖlfilterOil filter
2525th
VentilValve
2626th
HydrauliktankHydraulic tank
2727
AusspeiseventilDischarge valve
3030th
4/3-Wegeventil4/3-way valve
3434
Zweite HydraulikpumpeSecond hydraulic pump

Claims (7)

  1. Two-cylinder thick matter pump, in particular for conveying concrete, in which two delivery cylinders alternately convey the thick matter through a suction line into a delivery line, wherein the delivery cylinders are driven via hydraulically driven drive cylinders (12), wherein the drive cylinders (12) are connected via a control block (20) to a first adjustable hydraulic pump (18) conveying in one direction, wherein the first hydraulic pump (18) is connected on its pressure side to the high-pressure side of the control block (20) and by its suction side to the return connection of the control block (20) and wherein a second adjustable hydraulic pump (34) conveying in one direction with a smaller delivery volume than the first hydraulic pump (18) is provided and is connected on its suction side to a hydraulic tank (26),
    characterised in that
    the second hydraulic pump (34) is connected on its pressure side to the high-pressure side of the control block (20) and that the excess hydraulic oil produced by the second hydraulic pump (34) can be discharged from the hydraulic circuit (10) to the hydraulic tank (26) against a dynamic pressure of a predetermined magnitude, wherein the dynamic pressure is generated by a valve (25), which connects the return connection of the control block (20) to the hydraulic tank (26).
  2. Two-cylinder thick matter pump according to claim 1, characterised in that the size ratio of the first hydraulic pump (18) to the second hydraulic pump (34) is approx. 5 to 1.
  3. Two-cylinder thick matter pump according to one of the preceding claims, characterised in that the dynamic pressure generated is 3 to 15, in particular approx. 5 bar.
  4. Two-cylinder thick matter pump according to any one of the preceding claims, characterised in that an oil filter (24) is present, via which the hydraulic oil discharged from the hydraulic circuit (10) is carried.
  5. Two-cylinder thick matter pump according to any one of the preceding claims, characterised in that a 4/3-way valve (30) is arranged in the control block (20) to control the drive cylinders (12).
  6. Two-cylinder thick matter pump according to any one of the preceding claims, characterised in that a cooling device for cooling the hydraulic oil is provided in the low-pressure area between the return connection of the control block (20) and the suction side of the first hydraulic pump (18).
  7. Two-cylinder thick matter pump according to claim 6, characterised in that the valve (25), the oil filter (24), the cooling device and the hydraulic tank (26) are connected in series to one another.
EP19212083.0A 2018-11-30 2019-11-28 Two-cylinder slurry pump Active EP3660304B1 (en)

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Publication number Priority date Publication date Assignee Title
DE3243738A1 (en) * 1982-11-26 1984-05-30 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Hydraulic reversal for two-cylinder piston pump
DE3833845A1 (en) * 1988-10-05 1990-04-12 Putzmeister Maschf DENSITY PUMP WITH A SHUT-OFF ORGAN
DE3840892A1 (en) * 1988-12-05 1990-06-07 Putzmeister Maschf METHOD AND DEVICE FOR CONTROLLING A TWO-CYLINDER FUEL PUMP
DE19542258A1 (en) * 1995-11-13 1997-05-15 Putzmeister Maschf Method and device for controlling a two-cylinder thick matter pump
DE10036202A1 (en) * 2000-07-24 2002-02-07 Putzmeister Ag Slurry pump
DE10150467A1 (en) * 2001-10-16 2003-04-17 Putzmeister Ag Pump for chick material, comprises IC engine drive and at least one hydraulic pump of reversible type
DE102009021833A1 (en) * 2009-05-19 2010-11-25 Robert Bosch Gmbh Hydraulic drive and rotary valve for a hydraulic drive
DE102012209142A1 (en) * 2012-05-31 2013-12-05 Putzmeister Engineering Gmbh hydraulic system
DE102013006333A1 (en) * 2013-04-12 2014-10-16 Liebherr-Betonpumpen Gmbh Two-cylinder slurry pump

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