WO2014166639A1 - Two-cylinder thick matter pump - Google Patents

Two-cylinder thick matter pump Download PDF

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Publication number
WO2014166639A1
WO2014166639A1 PCT/EP2014/000986 EP2014000986W WO2014166639A1 WO 2014166639 A1 WO2014166639 A1 WO 2014166639A1 EP 2014000986 W EP2014000986 W EP 2014000986W WO 2014166639 A1 WO2014166639 A1 WO 2014166639A1
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WO
WIPO (PCT)
Prior art keywords
cylinder
hydraulic
pump
control block
hydraulic pump
Prior art date
Application number
PCT/EP2014/000986
Other languages
German (de)
French (fr)
Inventor
Georg Johannes Fetzer
Original Assignee
Liebherr-Betonpumpen Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liebherr-Betonpumpen Gmbh filed Critical Liebherr-Betonpumpen Gmbh
Priority to KR1020157032131A priority Critical patent/KR20160003697A/en
Priority to CN201480020659.1A priority patent/CN105339658B/en
Publication of WO2014166639A1 publication Critical patent/WO2014166639A1/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
    • 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
    • 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
    • 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
    • F04B15/023—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 supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
    • 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
    • F04B7/0023—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 a rotating 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
    • 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

Definitions

  • the invention relates to a two-cylinder slurry pump in particular for conveying concrete according to the preamble of claim 1.
  • Two-cylinder thick matter pumps usually consist of two individual pumps, which are interconnected in circuit technology and synchronized in their sequence of movements so that when pumping the one cylinder, the other 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 serves to convey a thick matter such as concrete to the respective sucking cylinder.
  • a pipe switch is usually present which can be moved back and forth between two shift end positions in order to produce the respectively correct connection between the cylinder opening, the conveyor line connection and the thick matter feed.
  • the transfer tube is usually swung back and forth by two hydraulic swing cylinders between two end positions, in which they produce the respectively necessary connection between the cylinder openings of the delivery cylinder and the delivery line connection or the thick material supply.
  • the pipe switch is connected at one end to the conveyor line, while the other end covers the cylinder opening of the currently pumping conveyor cylinder.
  • the cylinder opening of the suction cylinder is thus open to a Vorphilll capableer, from which the thick matter is absorbed.
  • Both the delivery cylinders and the swivel cylinders are usually hydraulically operated in the prior art.
  • open hydraulic circuits cf., FIG. 1
  • closed hydraulic circuits cf., FIG. 2
  • FIG. 1 shows a typical open hydraulic circuit 10 is shown, with which the delivery cylinder 12 of a two-cylinder slurry pump and corresponding pivot cylinder 14, which serve to pivot a diverter pipe 16, are driven.
  • the open circuit shown in Figure 1 is shown as a hydraulic pump hydraulic pump as adjustable in one direction promoting hydraulic pump 18.
  • the hydraulic tilt pump 18 delivers to the pressure side of a control block 20, in which two 3/4-way valves 22 are arranged. Since this is an open hydraulic circuit, the returning hydraulic oil from the control block via a hydraulic filter 24 is passed into a tank. In this system, switching takes place in a purely hydraulic sequential control. It is characterized by its simplicity and the simple components. However, a large volume of hydraulic oil is necessary.
  • the control block 20 is constructed comparatively heavy and expensive.
  • the closed hydraulic circuit has an exit valve 27, via which a part of the hydraulic oil can be discharged via a hydraulic filter 24 into a tank 26.
  • the extracted in the closed hydraulic circuit hydraulic oil, which also includes the additional leakage oil is introduced by additionally provided feed pumps 19 out of the tank 26 back into the hydraulic circuit.
  • This closed hydraulic circuit can be run at a much higher pressure level than the open hydraulic circuit.
  • the pivot cylinder 14 are controlled for the diverter valve 16 by means of a separate open hydraulic circuit.
  • an adjustable hydraulic pump with a conveying direction 21, which promotes the pressure side of a control block 23.
  • the closed system has the advantage that only a small volume of oil is needed and that no main control block is present. There is also no limit to the size of the pump and the hydraulic filter 24 can be made small.
  • the object of the invention is to develop a generic two-cylinder slurry pump so that it can be operated with a simple and robust hydraulic circuit.
  • this object is achieved from that of a two-cylinder thick matter system according to the preamble of claim 1 by the combination of the features of the preamble of claim 1 with the features of the characterizing part of claim 1.
  • a two-cylinder slurry pump in particular for the promotion of concrete, in which two conveyor cylinders alternately promote the thick matter through a suction line in a delivery line and a pivotable about two pivoting tube diverter is provided for switching between the first and the second delivery cylinder.
  • the delivery cylinders and the swivel cylinders are hydraulically driven.
  • both the delivery cylinder and the swivel cylinder are connected via a control block with an adjustable in one direction promoting hydraulic pump, which is connected on its pressure side to the high pressure side of the control block and with its suction side to the return port of the control block.
  • a second adjustable unidirectional hydraulic pump with a smaller delivery volume than the first hydraulic pump is additionally provided, which is connected on its suction side to a hydraulic tank.
  • the hydraulic system basically has two pumps, of which the larger pump is selectable from a type of hydraulic pump, as used in an open hydraulic circuit. According to the invention, however, this is used in a closed hydraulic circuit.
  • the second smaller pump corresponds in size to about the feed pump, as previously based on the closed system according to the prior art has been explained.
  • This is used according to the invention but as a pump in an open hydraulic circuit.
  • the closed circuit is established on the first pump by connecting its suction side to the return connection from the control block.
  • the size ratio between the first hydraulic pump to the second hydraulic pump is about 5 to 1.
  • the excess hydraulic oil is fed out of the substantially closed hydraulic circuit against a back pressure of a predetermined size to the tank.
  • the back pressure can be generated by the second hydraulic pump and is for example 5 bar.
  • two 4/3-way valves are arranged in the control block, one of the 4/3-way valves for controlling the drive cylinder and the other serve to drive the two delivery cylinder of the two-cylinder slurry pump.
  • an oil filter can advantageously be present, via which the hydraulic oil discharged from the hydraulic circuit is guided.
  • Figure 2 a hydraulic circuit for operating a two-cylinder slurry pump according to an alternative prior art
  • Figure 3 a hydraulic circuit for operating a two-cylinder slurry pump according to the present invention.
  • FIG. 3 shows an embodiment of the two-cylinder thick matter pump according to the invention.
  • Denoted at 10 is the hydraulic circuit via which, on the one hand, the two delivery cylinders 12 are actuated in such a way that they alternately transfer the thick material, i. usually concrete, convey through a suction line into a delivery line.
  • the pipe switch 16 can be pivoted via appropriately controlled pivoting cylinder 14 via the hydraulic circuit.
  • the pipe switch 16 consists of an S-shaped bent pipe, which in each case enables the necessary connection between the cylinder opening and the conveyor line connection for conveying the thick material through the conveyor line.
  • Both the delivery cylinder 12 and the pivot cylinder 14 are each supplied by a control block 20 with hydraulic fluid.
  • the 3/4-way valve 30 is used, while the control of the swing cylinder 14, the 3/4-way valve 32 is used.
  • Both 3/4-way valves 30 and 32 are powered by an adjustable one-way hydraulic pump 18. This is connected on its pressure side to the high pressure side of the 3/4-way valves 30 and 32.
  • the suction side of the hydraulic pump 18 is connected to the return port of the 3/4-way valves, so that the hydraulic pump 18 is driven in a closed hydraulic circuit.
  • a size smaller by about one-fifth pump 34 is provided which also represents an adjustable in one direction promoting hydraulic pump.
  • This is connected on its suction side with a tank 26 to receive hydraulic oil there.
  • This hydraulic oil is introduced with a certain form, in the present example, a pre-pressure of 5 bar in the exiting from the control block 20 return line. As a result, a back pressure of 5 bar is generated. Excess hydraulic oil is fed out against this back pressure of 5 bar to the tank 26 via a filter 24 out. The rest of the hydraulic oil remains in the closed circuit and is discharged from the Hydraulic pump 18, in which a pressure of 25 bar applied to the high pressure side of the control block 20 promoted.
  • the hydraulic circuit realized here has the advantage that comparatively little energy is destroyed.
  • a comparatively high pressure of 25 bar remains.
  • the unidirectional pump used herein is that which can be used in an open hydraulic circuit. This is cheaper to buy and operate than the commonly used in a closed circuit acting in both directions pump. Overall, less hydraulic oil is needed than in an open circuit. Overall, the system is easy to install and relatively easy to maintain.

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

Abstract

The invention relates to a two-cylinder thick matter pump, particularly for conveying concrete, wherein two conveying cylinders convey the thick matter through a suction line into a feed line in alternation and a transfer pipe is provided, which can be swivelled via two swivel cylinders, for switching between the first and the second conveying cylinder. The conveying cylinders and the swivel cylinders are hydraulically driven. According to the invention, the conveying cylinders and the swivel cylinders are connected via a control block to an adjustable hydraulic pump which conveys in one direction. Said pump is connected on the pressure side thereof to the high pressure side of the control block and on the suction side thereof to the return connection of the control block. In addition, a second, adjustable hydraulic pump is provided which conveys in one direction and has a smaller displacement volume than the first hydraulic pump and which is connected on the suction side thereof to a hydraulic tank.

Description

Zweizylinder-Dickstoffpumpe  Two-cylinder slurry pump
Die Erfindung betrifft eine Zweizylinder-Dickstoffpumpe insbesondere zur Förderung von Beton nach dem Oberbegriff des Anspruchs 1. The invention relates to a two-cylinder slurry pump in particular for conveying concrete according to the preamble of claim 1.
Zweizylinder-Dickstoffpumpen bestehen üblicherweise aus zwei Einzelpumpen, die schaltungstechnisch miteinander verknüpft und in ihrem Bewegungsablauf so synchronisiert sind, dass beim Pumpen des einen Zylinders der andere Zylinder 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 consist of two individual pumps, which are interconnected in circuit technology and synchronized in their sequence of movements so that when pumping the one cylinder, the other 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 zu dem jeweils saugenden Zylinder zu fördern. Bei der darauffolgenden Pumpbewegung wird das zuvor angesaugte Material aus dem nunmehr pumpenden Zylinder 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 Zylinderöffnung, dem Förderleitungsanschluss und der Dickstoffzuführung herzustellen. Die Rohrweiche wird üblicherweise durch hydraulische Schwenkzylinder zwischen zwei Endstellungen hin- und hergeschwenkt, in welchen sie die jeweils notwendige Verbindung zwischen den Zylinderöffnungen der Förderzylinder und dem Förderlei- tungsanschluss 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, von dem der Dickstoff aufgesaugt wird. The suction stroke serves to convey a thick matter such as concrete to the respective sucking cylinder. During the subsequent pumping movement, the previously aspirated material is forced out of the now pumping cylinder into a delivery line. To ensure that this process always takes place in the correct manner, a pipe switch is usually present which can be moved back and forth between two shift end positions in order to produce the respectively correct connection between the cylinder opening, the conveyor line connection and the thick matter feed. The transfer tube is usually swung back and forth by two hydraulic swing cylinders between two end positions, in which they produce the respectively necessary connection between the cylinder openings of the delivery cylinder and the delivery line connection or the thick material supply. In this case, the pipe switch is connected at one end to the conveyor line, while the other end covers the cylinder opening of the currently pumping conveyor cylinder. The cylinder opening of the suction cylinder is thus open to a Vorfüllbehälter, from which the thick matter is absorbed.
Sowohl die Förderzylinder wie auch die Schwenkzylinder werden üblicherweise im Stand der Technik hydraulisch betrieben. Hierzu sind im Stand der Technik einerseits offene Hydraulikkreise (vgl. Figur 1) bzw. geschlossene Hydraulikkreisläufe (vgl. Figur 2) bekannt. Both the delivery cylinders and the swivel cylinders are usually hydraulically operated in the prior art. For this purpose, in the prior art, on the one hand, open hydraulic circuits (cf., FIG. 1) or closed hydraulic circuits (cf., FIG. 2) are known.
In Figur 1 ist ein typischer offener Hydraulikkreislauf 10 dargestellt, mit welchem die Förderzylinder 12 einer Zweizylinder-Dickstoffpumpe sowie entsprechende Schwenkzylinder 14, die zum Verschwenken einer Rohrweiche 16 dienen, angetrieben werden. In dem in Figur 1 dargestellten offenen Kreis ist als Hydraulikpumpe eine Hydrauliktandempumpe als verstellbare in eine Richtung fördernde Hydraulikpumpe 18 dargestellt. Die Hydrauliktandempumpe 18 fördert auf die Druckseite eines Steuerblocks 20, in welchem zwei 3/4-Wegeventile 22 angeordnet sind. Da es sich hier um einen offenen Hydraulikkreislauf handelt, wird das rücklaufende Hydrauliköl vom Steuerblock über einen Hydraulikfilter 24 in einen Tank geleitet. Bei diesem System erfolgt das Umschalten in einer rein hydraulischen Folgesteuerung. Es zeichnet sich durch seine Einfachheit und durch die einfachen Komponenten aus. Allerdings ist ein großes Hydraulikölvolumen notwendig. Der Steuerblock 20 ist vergleichsweise schwer und aufwendig aufgebaut. Das gesamte System ist aufgrund des großen Tanks 26 wartungsintensiv. Da bei einem offenen Hydraulikkreislauf bei einem vergleichsweise geringen Hydraulikdruck gearbeitet wird, ist nur ein geringer Druck für das Umschalten vorhanden. Eine alternative Ansteuerung der Förderzylinder 12 bzw. der Schwenkzylinder 14 erfolgt über einen geschlossenen Hydraulikkreis, wie er ebenfalls aus dem Stand der Technik bekannt ist und beispielhaft anhand der Figur 2 erläutert wird. Auch hier ist eine Hydrauliktandempumpe 18 vorhanden, die allerdings als verstellbare Pumpe mit zwei Förderrichtungen vorgesehen ist, da sie dazu dient durch den Richtungswechsel die Förderzylinder 12 zu steuern. In der hier dargestellten Ausführungsvariante ist also für den die Förderzylinder antreibenden Hydraulikkreis kein Steuerblock mehr vorhanden. Anstelle des Steuerblocks tritt die Richtungsumkehr der Hydraulikpumpen 18. Der geschlossene Hydraulikkreislauf weist ein Ausspeiseventil 27 auf, über das jeweils ein Teil des Hydrauliköls über einen Hydraulikfilter 24 in einen Tank 26 abgeleitet werden kann. Das in dem geschlossenen Hydraulikkreislauf entnommene Hydrauliköl, das auch zusätzlich das Leckageöl um- fasst, wird durch zusätzlich vorzusehende Speisepumpen 19 aus dem Tank 26 heraus wieder in den Hydraulikkreislauf eingeführt. Dieser geschlossene Hydraulikkreislauf kann auf einem wesentlich höheren Druckniveau gefahren werden als der offene Hydraulikkreislauf. 1 shows a typical open hydraulic circuit 10 is shown, with which the delivery cylinder 12 of a two-cylinder slurry pump and corresponding pivot cylinder 14, which serve to pivot a diverter pipe 16, are driven. In the open circuit shown in Figure 1 is shown as a hydraulic pump hydraulic pump as adjustable in one direction promoting hydraulic pump 18. The hydraulic tilt pump 18 delivers to the pressure side of a control block 20, in which two 3/4-way valves 22 are arranged. Since this is an open hydraulic circuit, the returning hydraulic oil from the control block via a hydraulic filter 24 is passed into a tank. In this system, switching takes place in a purely hydraulic sequential control. It is characterized by its simplicity and the simple components. However, a large volume of hydraulic oil is necessary. The control block 20 is constructed comparatively heavy and expensive. The entire system is maintenance-intensive due to the large tank 26. Since working with an open hydraulic circuit at a comparatively low hydraulic pressure, only a small pressure for switching exists. An alternative control of the conveyor cylinder 12 and the pivot cylinder 14 via a closed hydraulic circuit, as it is also known from the prior art and is explained by way of example with reference to FIG 2. Again, a hydraulic pump 17 is present, which is, however, provided as an adjustable pump with two flow directions, since it serves to control the delivery cylinder 12 by the change of direction. In the embodiment shown here, therefore, no control block is available for the hydraulic cylinder driving the delivery cylinder. Instead of the control block, the direction reversal of the hydraulic pumps 18 occurs. The closed hydraulic circuit has an exit valve 27, via which a part of the hydraulic oil can be discharged via a hydraulic filter 24 into a tank 26. The extracted in the closed hydraulic circuit hydraulic oil, which also includes the additional leakage oil is introduced by additionally provided feed pumps 19 out of the tank 26 back into the hydraulic circuit. This closed hydraulic circuit can be run at a much higher pressure level than the open hydraulic circuit.
Allerdings werden die Schwenkzylinder 14 für die Rohrweiche 16 mittels eines gesonderten offenen Hydraulikkreislaufs angesteuert. Hierzu dient eine verstellbare Hydraulikpumpe mit einer Förderrichtung 21 , die auf die Druckseite eines Steuerblocks 23 fördert. Die jeweilige Umsteuerung der Schwenkzylinder 14 erfolgt über ein im Steuerblock vorhandenes 3/4-Wegeventil 25. Da hier die Richtung der Förderzylinder durch den Richtungswechsel der Tandempumpe 18 erfolgt, ist bei diesem System ein Umschalten nur in einer elektrischen Folgesteuerung möglich. Das geschlossene System hat den Vorteil, dass lediglich ein geringes Ölvolumen nötig ist und dass kein Hauptsteuerblock vorhanden ist. Es besteht hier auch keine Begrenzung der Pumpengröße und der Hydraulikfilter 24 kann klein dimensioniert werden. However, the pivot cylinder 14 are controlled for the diverter valve 16 by means of a separate open hydraulic circuit. Serves for this purpose an adjustable hydraulic pump with a conveying direction 21, which promotes the pressure side of a control block 23. The respective reversal of the swivel cylinder 14 via a present in the control block 3/4-way valve 25. Since the direction of the delivery cylinder takes place by the change in direction of the tandem pump 18, switching in this system is possible only in an electrical sequence control. The closed system has the advantage that only a small volume of oil is needed and that no main control block is present. There is also no limit to the size of the pump and the hydraulic filter 24 can be made small.
Andererseits ist es nachteilig, dass die zusätzlich vorzusehenden Speisepumpen 19 das einzuspeisende Hydrauliköl bei einem sehr hohen Druckniveau von beispielsweise 30 bar einspeisen müssen. Dadurch werden hier recht teure Kompo- nenten benötigt. Das gesamte System ist sehr komplex und wartungsintensiv. Eine Fehlersuche im Hydrauliksystem bzw. eine Einstellung des Hydrauliksystems ist nur sehr aufwendig. On the other hand, it is disadvantageous that the additionally provided feed pumps 19 must feed the hydraulic oil to be fed in at a very high pressure level of, for example, 30 bar. This makes quite expensive components needed. The whole system is very complex and maintenance intensive. A troubleshooting in the hydraulic system or an adjustment of the hydraulic system is very expensive.
Aufgabe der Erfindung ist es, eine gattungsgemäße Zweizylinder-Dickstoffpumpe derart weiterzubilden, dass sie mit einem möglichst einfach bauenden und robusten Hydraulikkreislauf betreibbar ist. The object of the invention is to develop a generic two-cylinder slurry pump so that it can be operated with a simple and robust hydraulic circuit.
Erfindungsgemäß wird diese Aufgabe aus dem von einem Zweizylinder- Dickstoff System nach dem Oberbegriff des Anspruchs 1 durch die Kombination der Merkmale des Oberbegriffs des Anspruchs 1 mit den Merkmalen des kennzeichnenden Teils des Anspruchs 1 gelöst. According to the invention this object is achieved from that of a two-cylinder thick matter system according to the preamble of claim 1 by the combination of the features of the preamble of claim 1 with the features of the characterizing part of claim 1.
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 und eine über zwei Schwenkzylinder schwenkbare Rohrweiche zum Umschalten zwischen dem ersten und dem zweiten Förderzylinder vorgesehen ist. Die Förderzylinder und die Schwenkzylinder werden hydraulisch angetrieben. Erfindungsgemäß sind sowohl die Förderzylinder wie auch die Schwenkzylinder über einen Steuerblock mit einer verstellbaren in eine Richtung fördernden Hydraulikpumpe verbunden, wobei diese auf ihrer Druckseite mit der Hochdruckseite des Steuerblocks und mit ihrer Saugseite mit dem Rücklaufan- schluss des Steuerblocks verbunden ist. Eine zweite verstellbare in eine Richtung fördernde Hydraulikpumpe mit kleinerem Fördervolumen als die erste Hydraulikpumpe ist zusätzlich vorgesehen, die auf ihrer Saugseite mit einem Hydrauliktank verbunden ist. Accordingly, a two-cylinder slurry pump is provided in particular for the promotion of concrete, in which two conveyor cylinders alternately promote the thick matter through a suction line in a delivery line and a pivotable about two pivoting tube diverter is provided for switching between the first and the second delivery cylinder. The delivery cylinders and the swivel cylinders are hydraulically driven. According to the invention, both the delivery cylinder and the swivel cylinder are connected via a control block with an adjustable in one direction promoting hydraulic pump, which is connected on its pressure side to the high pressure side of the control block and with its suction side to the return port of the control block. A second adjustable unidirectional hydraulic pump with a smaller delivery volume than the first hydraulic pump is additionally provided, which is connected on its suction side to a hydraulic tank.
Das Hydrauliksystem hat also grundsätzlich zwei Pumpen, von denen die größere Pumpe von einer Bauart von Hydraulikpumpen wählbar ist, wie sie in einem offenen Hydraulikkreis verwendet wird. Entsprechend der Erfindung wird dieser aber in einem geschlossenen Hydraulikkreis verwendet. Die zweite kleinere Pumpe entspricht in ihrer Baugröße ungefähr der Speisepumpe, wie sie vorher anhand des geschlossenen Systems nach dem Stand der Technik erläutert wurde. Diese wird erfindungsgemäß aber als eine Pumpe in einem offenen Hydraulikkreis eingesetzt. Der geschlossene Kreislauf wird bei der ersten Pumpe dadurch hergestellt, dass ihre Saugseite mit dem Rücklaufanschluss vom Steuerblock angeschlossen ist. Thus, the hydraulic system basically has two pumps, of which the larger pump is selectable from a type of hydraulic pump, as used in an open hydraulic circuit. According to the invention, however, this is used in a closed hydraulic circuit. The second smaller pump corresponds in size to about the feed pump, as previously based on the closed system according to the prior art has been explained. This is used according to the invention but as a pump in an open hydraulic circuit. The closed circuit is established on the first pump by connecting its suction side to the return connection from the control block.
Bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den sich an den Hauptanspruch anschließenden Unteransprüchen. Preferred embodiments of the invention will become apparent from the subsequent claims to the main claim.
Bevorzugt ist das Größenverhältnis zwischen der ersten Hydraulikpumpe zur zweiten Hydraulikpumpe ca. 5 zu 1. Preferably, the size ratio between the first hydraulic pump to the second hydraulic pump is about 5 to 1.
Das überschüssige Hydrauliköl wird aus dem im Wesentlichen geschlossenen Hydraulikkreislauf gegen einen Staudruck vorbestimmter Größe zum Tank hin ausgespeist. Der Staudruck kann von der zweiten Hydraulikpumpe erzeugt werden und beträgt beispielsweise 5 bar. The excess hydraulic oil is fed out of the substantially closed hydraulic circuit against a back pressure of a predetermined size to the tank. The back pressure can be generated by the second hydraulic pump and is for example 5 bar.
Vorteilhaft sind im Steuerblock zwei 4/3-Wegeventile angeordnet, wobei eines der 4/3-Wegeventile zur Ansteuerung der Antriebszylinder und das andere zum Antrieb der beiden Förderzylinder der Zweizylinder-Dickstoffpumpe dienen. Advantageously, two 4/3-way valves are arranged in the control block, one of the 4/3-way valves for controlling the drive cylinder and the other serve to drive the two delivery cylinder of the two-cylinder slurry pump.
Weiterhin kann vorteilhaft ein Ölfilter vorhanden sein, über den das aus dem Hydraulikkreislauf ausgespeiste Hydrauliköl geführt wird. Furthermore, an oil filter can advantageously be present, via which the hydraulic oil discharged from the hydraulic circuit is guided.
Weitere Merkmale, Einzelheiten und Vorteile der Erfindung werden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen: Further features, details and advantages of the invention will be explained in more detail with reference to an embodiment shown in the drawing. Show it:
Figur 1 : einen Hydraulikkreislauf zum Betreiben einer Zweizylinder- Dickstoffpumpe nach dem Stand der Technik, 1 shows a hydraulic circuit for operating a two-cylinder thick matter pump according to the prior art,
Figur 2: einen Hydraulikkreislauf zum Betreiben einer Zweizylinder- Dickstoffpumpe nach einem alternativen Stand der Technik und Figur 3: einen Hydraulikkreis zum Betreiben einer Zweizylinder-Dickstoffpumpe entsprechend der vorliegenden Erfindung. Figure 2: a hydraulic circuit for operating a two-cylinder slurry pump according to an alternative prior art and Figure 3: a hydraulic circuit for operating a two-cylinder slurry pump according to the present invention.
In der Figur 3 ist eine Ausführungsform der erfindungsgemäßen Zweizylinder- Dickstoffpumpe gezeigt. Mit 10 ist der Hydraulikkreis bezeichnet, über den zum einen die beiden Förderzylinder 12 derartig angesteuert werden, dass sie alternierend den Dickstoff, d.h. in der Regel Beton, durch eine Saugleitung in eine Förderleitung fördern. Gleichzeitig kann über den Hydraulikkreis die Rohrweiche 16 über entsprechend angesteuerte Schwenkzylinder 14 verschwenkt werden. Die Rohrweiche 16 besteht aus einem S-förmig gebogenen Rohr, welches jeweils die notwendige Verbindung zwischen der Zylinderöffnung und dem Förderleitungsan- schluss zur Förderung des Dickstoffs durch die Förderleitung ermöglicht. FIG. 3 shows an embodiment of the two-cylinder thick matter pump according to the invention. Denoted at 10 is the hydraulic circuit via which, on the one hand, the two delivery cylinders 12 are actuated in such a way that they alternately transfer the thick material, i. usually concrete, convey through a suction line into a delivery line. At the same time, the pipe switch 16 can be pivoted via appropriately controlled pivoting cylinder 14 via the hydraulic circuit. The pipe switch 16 consists of an S-shaped bent pipe, which in each case enables the necessary connection between the cylinder opening and the conveyor line connection for conveying the thick material through the conveyor line.
Sowohl die Förderzylinder 12 wie auch die Schwenkzylinder 14 werden jeweils durch einen Steuerblock 20 mit Hydraulikflüssigkeit versorgt. Zur Ansteuerung der Förderzylinder dient das 3/4-Wegeventil 30, während zur Steuerung der Schwenkzylinder 14 das 3/4-Wegeventil 32 herangezogen wird. Beide 3/4-Wegeventile 30 und 32 werden über eine verstellbare in eine Richtung fördernde Hydraulikpumpe 18 versorgt. Diese ist auf ihrer Druckseite mit der Hochdruckseite der 3/4- Wegeventile 30 und 32 verbunden. Die Saugseite der Hydraulikpumpe 18 ist mit dem Rücklaufanschluss der 3/4-Wegeventile verbunden, sodass die Hydraulikpumpe 18 in einem geschlossenen Hydraulikkreislauf gefahren wird. Both the delivery cylinder 12 and the pivot cylinder 14 are each supplied by a control block 20 with hydraulic fluid. For controlling the delivery cylinder, the 3/4-way valve 30 is used, while the control of the swing cylinder 14, the 3/4-way valve 32 is used. Both 3/4-way valves 30 and 32 are powered by an adjustable one-way hydraulic pump 18. This is connected on its pressure side to the high pressure side of the 3/4-way valves 30 and 32. The suction side of the hydraulic pump 18 is connected to the return port of the 3/4-way valves, so that the hydraulic pump 18 is driven in a closed hydraulic circuit.
Parallel zur Hydraulikpumpe 18 ist eine in ihrer Größe ca. um ein Fünftel kleinere Pumpe 34 vorgesehen, welche ebenfalls eine verstellbare in eine Richtung fördernde Hydraulikpumpe darstellt. Diese ist auf ihrer Saugseite mit einem Tank 26 verbunden, um dort Hydrauliköl aufzunehmen. Dieses Hydrauliköl wird mit einem bestimmten Vordruck, im vorliegenden Beispiel einem Vordruck von 5 bar in die aus dem Steuerblock 20 austretende Rücklaufleitung eingeleitet. Hierdurch wird ein Staudruck in Höhe von 5 bar erzeugt. Überschüssiges Hydrauliköl wird gegen diesen Staudruck von 5 bar zum Tank 26 über einen Filter 24 hin ausgespeist. Der Rest des Hydrauliköls verbleibt in dem geschlossenen Kreislauf und wird von der Hydraulikpumpe 18, bei welcher ein Druck von 25 bar anliegt auf die Hochdruckseite des Steuerblocks 20 gefördert. Parallel to the hydraulic pump 18, a size smaller by about one-fifth pump 34 is provided which also represents an adjustable in one direction promoting hydraulic pump. This is connected on its suction side with a tank 26 to receive hydraulic oil there. This hydraulic oil is introduced with a certain form, in the present example, a pre-pressure of 5 bar in the exiting from the control block 20 return line. As a result, a back pressure of 5 bar is generated. Excess hydraulic oil is fed out against this back pressure of 5 bar to the tank 26 via a filter 24 out. The rest of the hydraulic oil remains in the closed circuit and is discharged from the Hydraulic pump 18, in which a pressure of 25 bar applied to the high pressure side of the control block 20 promoted.
Der hier realisierte Hydraulikkreislauf hat den Vorteil, dass vergleichsweise wenig Energie vernichtet wird. Im geschlossenen Kreis der Hydraulikpumpe 18 verbleibt ein vergleichsweise hoher Druck von 25 bar. Dadurch muss das Hydrauliköl auch nicht so stark gekühlt werden. Die hier verwendete nur in eine Richtung wirkende Pumpe entspricht derjenigen, wie sie in einem offenen Hydraulikkreis verwendet werden kann. Diese ist in der Anschaffung und im Betrieb günstiger als die üblicherweise in einem geschlossenen Kreislauf verwendete in beide Richtungen wirkende Pumpe. Insgesamt wird auch weniger Hydrauliköl benötigt als in einem offenen Kreislauf. Das System ist insgesamt einfach zu installieren und vergleichsweise einfach zu warten. The hydraulic circuit realized here has the advantage that comparatively little energy is destroyed. In the closed circuit of the hydraulic pump 18, a comparatively high pressure of 25 bar remains. As a result, the hydraulic oil does not have to be cooled as much. The unidirectional pump used herein is that which can be used in an open hydraulic circuit. This is cheaper to buy and operate than the commonly used in a closed circuit acting in both directions pump. Overall, less hydraulic oil is needed than in an open circuit. Overall, the system is easy to install and relatively easy to maintain.

Claims

Patentansprüche claims
1. Zweizylinder-Dickstoffpumpe insbesondere zur Förderung von Beton, bei der zwei Förderzylinder alternierend den Dickstoff durch eine Saugleitung in eine Förderleitung fördern und eine über zwei Schwenkzylinder schwenkbare Rohrweiche zum Umschalten zwischen dem ersten und dem zweiten Förderzylinder vorgesehen ist, wobei die Förderzylinder und die Schwenkzylinder hydraulisch angetrieben sind, dadurch gekennzeichnet, dass sowohl die Förderzylinder wie auch die Schwenkzylinder über einen Steuerblock mit einer verstellbaren in eine Richtung fördernden Hydraulikpumpe verbunden sind, wobei diese 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 Rieh- tung fördernde Hydraulikpumpe mit kleinerem Fördervolumen als die erste Hydraulikpumpe vorgesehen ist, die auf ihrer Saugseite mit einem Hydrauliktank verbunden ist. 1. Two-cylinder sludge pump in particular for the promotion of concrete, in which two conveyor cylinders alternately promote the thick matter through a suction line in a delivery line and a pivotable about two swivel cylinder diverter is provided for switching between the first and the second conveyor cylinder, wherein the conveyor cylinder and the swivel cylinder are hydraulically driven, characterized in that both the conveying cylinder and the pivot cylinder are connected via a control block with an adjustable in one direction conveying hydraulic pump, which is connected on its pressure side to the high pressure side of the control block and with its suction side to the return port of the control block that a second adjustable into a cattle tion-promoting hydraulic pump with a smaller delivery volume than the first hydraulic pump is provided, which is connected on its suction side with a hydraulic tank.
Zweizylinder-Dickstoffpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass das Größenverhältnis zwischen der ersten Hydraulikpumpe zur zweiten Hydraulikpumpe ca. 5 zu 1 ist. Two-cylinder slurry pump according to claim 1, characterized in that the size ratio between the first hydraulic pump to the second hydraulic pump is about 5 to 1.
Zweizylinder-Dickstoffpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das überschüssige Hydrauliköl aus dem Hydraulikkreislauf gegen einen Staudruck vorbestimmter Größe zum Tank ausgespeist wird. Two-cylinder slurry pump according to claim 1 or 2, characterized in that the excess hydraulic oil is fed out of the hydraulic circuit against a back pressure of a predetermined size to the tank.
Zweizylinder-Dickstoffpumpe nach Anspruch 3, dadurch gekennzeichnet, dass der Staudruck von der zweiten Hydraulikpumpe erzeugt wird. Two-cylinder slurry pump according to claim 3, characterized in that the dynamic pressure is generated by the second hydraulic pump.
Zweizylinder-Dickstoffpumpe nach Anspruch 4, dadurch gekennzeichnet, dass der erzeugte Staudruck ca. 5 bar beträgt. Two-cylinder slurry pump according to claim 4, characterized in that the generated back pressure is about 5 bar.
Zweizylinder-Dickstoffpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass im Steuerblock zwei 4/3-Wegeventile angeordnet sind. Two-cylinder thick matter pump according to one of claims 1 to 5, characterized in that two 4/3-way valves are arranged in the control block.
Fahrbare Betonpumpe nach Anspruch 6, dadurch gekennzeichnet, dass das eine 4/3-Wegeventil zur Ansteuerung der Antriebszylinder und dass das andere 4/3-Wegeventil zum Antrieb der beiden Kolben-Zylinderanordnungen der Zweizylinder-Dickstoffpumpe dienen. Mobile concrete pump according to claim 6, characterized in that the one 4/3-way valve for controlling the drive cylinder and that the other 4/3-way valve to drive the two piston-cylinder assemblies of the two-cylinder slurry pump serve.
Zweizylinder-Dickstoffpumpe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein Ölfilter vorhanden ist, über den das aus dem Hydraulikkreislauf ausgespeiste Hydrauliköl geführt wird. Two-cylinder thick matter pump according to one of claims 1 to 7, characterized in that an oil filter is present, via which the hydraulic oil discharged from the hydraulic circuit is fed.
PCT/EP2014/000986 2013-04-12 2014-04-11 Two-cylinder thick matter pump WO2014166639A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004103A1 (en) * 1988-10-05 1990-04-19 Putzmeister-Werk Maschinenfabrik Gmbh Thick-matter pump with downstream shut-off device
DE19542258A1 (en) * 1995-11-13 1997-05-15 Putzmeister Maschf Method and device for controlling a two-cylinder thick matter 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

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US3667869A (en) * 1970-03-04 1972-06-06 Karl Schlecht Dual cylinder-concrete pump
DE102011083874A1 (en) * 2011-09-30 2013-04-04 Putzmeister Engineering Gmbh Hydraulic system with suction return filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004103A1 (en) * 1988-10-05 1990-04-19 Putzmeister-Werk Maschinenfabrik Gmbh Thick-matter pump with downstream shut-off device
DE19542258A1 (en) * 1995-11-13 1997-05-15 Putzmeister Maschf Method and device for controlling a two-cylinder thick matter 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

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