EP2761190A2 - Hydraulic system with suction/return filter - Google Patents

Hydraulic system with suction/return filter

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Publication number
EP2761190A2
EP2761190A2 EP12746359.4A EP12746359A EP2761190A2 EP 2761190 A2 EP2761190 A2 EP 2761190A2 EP 12746359 A EP12746359 A EP 12746359A EP 2761190 A2 EP2761190 A2 EP 2761190A2
Authority
EP
European Patent Office
Prior art keywords
suction
return
line
filter
hydraulic
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP12746359.4A
Other languages
German (de)
French (fr)
Other versions
EP2761190B1 (en
Inventor
Jan-Martin VEIT
Markus STASS
Werner MÜNZENMAIER
Hans-Peter RENZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Putzmeister Engineering GmbH
Original Assignee
Putzmeister Engineering 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 Putzmeister Engineering GmbH filed Critical Putzmeister Engineering GmbH
Publication of EP2761190A2 publication Critical patent/EP2761190A2/en
Application granted granted Critical
Publication of EP2761190B1 publication Critical patent/EP2761190B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/46—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing and placing the materials, e.g. slurry seals
    • E01C19/47—Hydraulic cement concrete mixers combined with distributing means specially adapted for road building
    • E01C19/475—Distributing means therefor, e.g. boom-and-bucket arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices

Definitions

  • the invention relates to a hydraulic system, preferably for controlling and actuating a mobile thick matter pump, having a tank under atmospheric pressure for receiving hydraulic oil, with a at least one hydraulic consumer driving primary circuit, the at least one motor-driven input side via a first suction line acted upon with hydraulic oil, on the output side to a at least one first return line connected hydraulic primary pump and an output side communicating with the suction line and the input side with return oil from the at least one return line acted suction return filter and with a branched off from the first suction line, about a bias valve in the tank opening branch line.
  • the invention differs from conventional thick matter pumps in that the suction line to the primary pump and the returns from the primary circuit do not open into the tank, but that the suction line communicates with the outlet side of the suction / return filter, while the return lines to the inlet side of the suction Return filters are connected.
  • This so-called suction-return filter system requires an excess amount of oil to z. B. compensate for leakage oil, which are led directly to the tank, or to compensate for short-term missing oil volumes in the return due to the compressibility of the hydraulic oil on the pressure side.
  • a secondary circuit which has at least one motor-driven, acted upon by a second suction line with hydraulic oil, output connected to at least one second return line hydraulic secondary pump, the second suction preferably communicates via a suction filter with the tank and the second return line either flows into the tank or the input side is connected to the suction-return filter.
  • the Ver- remaining excess oil in the suction-return filter system is fed to the tank via the preload valve.
  • the suction / return filter system ensures that the surplus oil quantity in conjunction with the preload valve results in optimum suction conditions for the primary pumps connected to the first intake line in the primary circuit, that the cold start behavior is improved by the preload and that the fuel passing through the tank Guided oil quantity is significantly reduced, so that a much smaller tank volume and thereby a weight reduction and a cost reduction during oil change is possible.
  • the first suction line communicates with the tank via a separate, large-sized suction line and a further suction filter and that a suction-suction valve biased in the direction of the further suction filter is arranged in the suction line.
  • a preferred embodiment of the invention provides that in at least one of the return lines, an oil cooler is arranged. This is especially important when it comes to heating the hydraulic oil during operation. It is further proposed according to a preferred embodiment of the invention that in at least one of the input side connected to the suction-return filter return lines, a check valve is arranged.
  • a preferred embodiment of the invention provides that at least one of the primary pumps in the primary circuit is designed as a filling and feed pump of a two-cylinder slurry pump driven by a reversing pump. It is a guided over the reversing pump closed hydraulic circuit, which forms the consumer in the terminology of the present invention together with the reversing pump.
  • one of the return lines is designed as a drain line of the reversible pump. If, to increase the cooling capacity, the reversing pump leakage oil must be routed through an oil cooler, it may be necessary to provide a check valve in the respective return line in order to protect the reversing pump against pressure peaks from the other recirculation. In addition, a check valve must then be provided, which is connected on the outlet side directly to the suction-return filter or leads directly into the tank.
  • a further advantageous embodiment of the invention provides that one of the return lines is designed as a flushing oil line connected on the output side to an alternating flush valve of the reversing pump, which is preferably returned to the suction / return filter via the oil cooler.
  • one of the hydraulic primary pumps is connected to the drive hydraulics of a distribution mast as a consumer whose return line is connected on the input side to the suction-return filter.
  • one of the primary pumps or secondary pumps is connected to a hydraulic agitator drive whose return line is connected on the input side to the suction-return filter.
  • one of the secondary pumps in the secondary circuit can be connected to the drive hydraulics of a diverter valve or a slide valve of the slurry pump, whose return line opens into the tank.
  • a separate hydraulic secondary pump to be provided in the secondary circuit. see, which is connected with its pressure side input side to the suction-return filter and supplies at least a portion of the required excess oil.
  • a check valve or by-pass valve is arranged between the inlet side of the suction / return filter and the tank.
  • the hydraulic circuits shown in FIGS. 1 and 2 are intended for a thick matter pump, the two delivery cylinder 10,10 ', the frontal openings 12,12' open into a material feed container, not shown, and alternately during the pressure stroke via a crossover 14 with a conveyor line, not shown, are connectable.
  • the delivery cylinders 10, 10 ' are driven in push-pull fashion via hydraulic drive cylinders 16, 16' and the hydraulic reversing pumps 18, 20 designed as swash plate axial piston pumps in the embodiment shown.
  • the delivery pistons 22, 22 ' are connected to the drive pistons 24, 24' of the drive cylinders 16, 16 'via a respective common piston rod 26, 26'.
  • Between the delivery cylinders 10,10 'and the drive cylinders 16,16' is a water tank 28 through which the piston rods 26,26 'reach through.
  • the drive cylinder 16,16 ' are in the embodiments shown on the bottom side via hydraulic lines 30, 30', 32, 32 'of a closed Main circuit using the reversing 18.20 charged with hydraulic oil and are hydraulically connected to each other at their rod-side ends via a swing oil pipe 34.
  • the direction of movement of the drive piston 24,24 'and thus the delivery piston 22,22' is reversed, that the swash plates 18 ', 20' of the Reversierpumpen 18,20 triggered by a Um tenusignal swing through its zero position and thus the conveying direction of the hydraulic oil in the hydraulic lines 30, 30 ', 32, 32' of the main circuit change.
  • the primary pumps 36,38 are arranged in a suction-return system having an output side 40 "connected to a suction-return filter 40 first suction line 42 and its coming from the reversing 18.20 Lecköltechnischen as return lines 44,44 'input side 40' to the A further return line 46 is branched off from the drive hydraulic system AH via an alternating purge valve 48 and a low-pressure limiting valve 50 and returned via the oil cooler 52 and the line 54 to the inlet side 40 'of the suction / return filter 40
  • the suction / return filter system requires an excess quantity of oil in order, for example, to compensate for leakage oil quantities flowing to the tank 68 via the lines 55 or to compensate for short-term missing oil quantities due to the compressibility of the hydraulic oil on the pressure side is at least partially about one in a Se arranged secondarily arranged, motor-driven and at least one second suction line 58 acted upon by hydraulic oil hydraulic secondary pump 60,62.
  • the second suction line 58 communicates Either directly or via a suction filter 66 with the tank 68.
  • the secondary circuit On the output side, the secondary circuit is connected to at least one return line, which either opens into the tank 68 or is connected to the input side 40 'of the suction-return filter 40.
  • the suction-return filter system also includes a check valve on the input side 40 'of the suction-return filter 40, which protects as a bypass valve 72, the filter element of the suction-return filter 40 from excessive pressure difference.
  • the advantages of the suction / return filter system consist in the fact that the excess amount of oil in conjunction with the preload valve 70 results in optimum suction conditions for the primary pumps in the primary circuit. Furthermore, the cold start behavior of the primary pumps is improved and the amount of oil circulating through the tank 68 is reduced. The latter means that the tank volume, for example, reduced to less than half the usual size and thus the tank and oil weight and to be exchanged at an oil change amount of oil.
  • the circuit for actuating and controlling the distribution boom MH is a consumer of the primary circuit.
  • the supply of the mast control via the further primary pump 71, the suction side is connected via the line 73 to the first Sauglei- 42 at the output 40 "of the suction-return filter 40 and the return line 74 via the oil cooler 52 and the line 54 to the input side of In the load part MH of the mast control, the outrigger control can optionally also be integrated, which ensures that the mobile concrete pump with its hydraulically actuated support legs is supported on the ground Differential cylinders, as used, for example, to extend the support legs and to extend them.
  • ren of the mast come to a significant undersupply in the suction-return filter system. This is partially compensated in the embodiment shown by a large amount of excess oil, which is recycled in the secondary circuit with a large secondary pump 60,62 which is connected to the tank 68 to the suction-return filter 40.
  • the secondary pump 60 is used for this purpose, which serves as a consumer for controlling an arranged in the material feed tank agitator RS whose return line 76 via the oil cooler 52 and the output line 54 to the input 40 'of the suction-return filter 40 is returned.
  • the embodiment of FIG. 2 differs in this respect from Fig. 1 in that the agitator control RS is supplied with a primary pump 61 via the suction-return filter 40 and the first suction line 42 with hydraulic oil and thus is part of the primary circuit.
  • a secondary pump 62 dedicated to the provision of the surplus oil is provided, the suction side 62 'communicates with the tank 68 via the second suction line 58 and the suction filter 66 and the pressure side 62 "either via the oil cooler 52 and the line 54 or via the check valve 78 and the line 80 to the input side 40 'of the suction-return filter 40 is guided.
  • Another special feature of the invention is that at least part of the excess oil quantity is made available via a separate, adequately dimensioned suction line 86.
  • This Nachsaugetechnisch 86 is attached to the suction filter 66 in the embodiment shown. closed, from which the primary pumps 36,38,61, 70 of the primary circuit suck in hydraulic oil via a Nachsaugeventil 88 and the first suction line 42.
  • the Nachsaugetechnisch 86 must be at least so dimensioned that at maximum Nachsaugemenge the flow rate in the Nachsaugetechnisch does not rise above 0.8 m / s and the negative pressure does not fall below the permissible minimum value of the priming primary pump, for example, 0.8 bar.
  • the Nachsaugetechnisch 86 and the Nachsaugeventil 88 must be sufficiently large, because there may be an operating condition in which only the primary pump 71 of the mast hydraulic MH is in operation and the drive for the other hydraulic pumps is turned off. In this case, then the secondary pump 60 and 62 for the excess oil amount out of service.
  • the differential cylinders in the mast hydraulics MH or in the support hydraulics retract or off, there is either an excess of oil at the suction return filter 40, which is led to the tank 68 via the preload valve 70, or the result is a Lack of oil, which must then be compensated via the Nachsauge effet 86 and the Nachsaugeventil 88 and the suction filter 66 from the tank 68.
  • the invention relates to a hydraulic system, preferably for driving and actuating a two-cylinder slurry pump.
  • the hydraulic system includes a tank 68 for receiving hydraulic oil, a primary circuit having at least one hydraulic consumer AH, MH, the at least one acted upon by a first suction line 42 with hydraulic oil primary pump 36,38,61, 70 and the output side is connected to at least one first return line and the one with the output side Having the first suction line 42 communicating and the input side with return oil from the at least one return line acted upon suction-return filter 40.
  • a special feature of the invention is that the first suction line 42 via a separate Nachsaugetechnisch 86 and a suction filter 66 communicates with the tank 68, wherein in the Nachsauge effet 86 an in the direction of the suction filter 66 biased Nachsaugeventil 88 is arranged.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Filtration Of Liquid (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a hydraulic system, preferably for piloting and actuating a two-cylinder thick matter pump. The hydraulic system comprises a tank (68) for receiving hydraulic oil, a primary circuit having at least one hydraulic consumer (AH, MH) which has at least one primary pump (36, 38, 61, 70), which is loaded with hydraulic oil via a first suction line (42), and is connected on the outlet side to at least one first return line, and which has a suction/return filter (40) which communicates with the first suction line (42) on the outlet side and is loaded on the inlet side with return oil from the at least one return line. A special feature of the invention consists in that the first suction line (42) communicates with the tank (68) via a separate replenishing suction line (86) and a suction filter (66), wherein a replenishing suction valve (88) which is preloaded in the direction of the suction filter (66) is arranged in the replenishing suction line (86).

Description

Hydrauliksystem mit Saug-Rücklauffilter Beschreibung Die Erfindung betrifft ein Hydrauliksystem, vorzugsweise zum Ansteuern und Betätigen einer mobilen Dickstoffpumpe, mit einem unter atmosphärischem Druck stehenden Tank zur Aufnahme von Hydrauliköl, mit einem mindestens einen hydraulischen Verbraucher ansteuernden Primärkreis, der mindestens eine motorisch angetriebene, eingangsseitig über eine erste Saugleitung mit Hydrauliköl beaufschlagte, ausgangsseitig an eine mindestens eine erste Rücklaufleitung angeschlossene hydraulische Primärpumpe sowie einen ausgangsseitig mit der Saugleitung kommunizierenden und eingangsseitig mit Rücklauföl aus der mindestens einen Rücklaufleitung beaufschlagten Saug-Rücklauffilter aufweist und mit einer von der ersten Saugleitung abge- zweigten, über ein Vorspannventil in den Tank mündenden Zweigleitung.  The invention relates to a hydraulic system, preferably for controlling and actuating a mobile thick matter pump, having a tank under atmospheric pressure for receiving hydraulic oil, with a at least one hydraulic consumer driving primary circuit, the at least one motor-driven input side via a first suction line acted upon with hydraulic oil, on the output side to a at least one first return line connected hydraulic primary pump and an output side communicating with the suction line and the input side with return oil from the at least one return line acted suction return filter and with a branched off from the first suction line, about a bias valve in the tank opening branch line.
Die Erfindung unterscheidet sich von üblichen Dickstoffpumpen dadurch, dass die Saugleitung zur Primärpumpe und die Rückläufe aus dem Primärkreis nicht in den Tank münden, sondern dass die Saugleitung mit der Aus- gangsseite des Saug-Rücklauffilters kommuniziert, während die Rücklaufleitungen mit der Eingangsseite des Saug-Rücklauffilters verbunden sind. Dieses sogenannte Saug-Rücklauffilter-System erfordert eine Überschussöl- menge, um z. B. Leckölmengen auszugleichen, welche direkt zum Tank geführt werden, oder um im Rücklauf kurzzeitig fehlende Ölmengen aufgrund der Kompressibilität des Hydrauliköls auf der Druckseite auszugleichen. Dementsprechend wird gemäß der Erfindung ein Sekundärkreis vorgeschlagen, der mindestens eine motorisch angetriebene, über eine zweite Saugleitung mit Hydrauliköl beaufschlagte, ausgangsseitig an mindestens eine zweite Rücklaufleitung angeschlossene hydraulische Sekundärpumpe aufweist, wobei die zweite Saugleitung vorzugsweise über ein Saugfilter mit dem Tank kommuniziert und die zweite Rücklaufleitung entweder in den Tank mündet oder eingangsseitig an den Saug-Rücklauffilter angeschlossen ist. Die ver- bleibende Überschussölmenge im Saug-Rücklauffilter-System wird über das Vorspannventil zum Tank geführt. The invention differs from conventional thick matter pumps in that the suction line to the primary pump and the returns from the primary circuit do not open into the tank, but that the suction line communicates with the outlet side of the suction / return filter, while the return lines to the inlet side of the suction Return filters are connected. This so-called suction-return filter system requires an excess amount of oil to z. B. compensate for leakage oil, which are led directly to the tank, or to compensate for short-term missing oil volumes in the return due to the compressibility of the hydraulic oil on the pressure side. Accordingly, a secondary circuit is proposed according to the invention, which has at least one motor-driven, acted upon by a second suction line with hydraulic oil, output connected to at least one second return line hydraulic secondary pump, the second suction preferably communicates via a suction filter with the tank and the second return line either flows into the tank or the input side is connected to the suction-return filter. The Ver- remaining excess oil in the suction-return filter system is fed to the tank via the preload valve.
Mit dem Saug-Rücklauffilter-System wird erreicht, dass durch die Über- schussölmenge in Verbindung mit dem Vorspannventil sich optimale Saugverhältnisse für die an die erste Saugleitung im Primärkreis angeschlossenen Primärpumpen ergeben, dass das Kaltstartverhalten durch die Vorspannung verbessert wird und dass die durch den Tank geführte Ölmenge signifikant reduziert wird, so dass ein wesentlich kleineres Tankvolumen und dadurch eine Gewichtsreduzierung und eine Kostenreduzierung beim Ölwechsel möglich ist. The suction / return filter system ensures that the surplus oil quantity in conjunction with the preload valve results in optimum suction conditions for the primary pumps connected to the first intake line in the primary circuit, that the cold start behavior is improved by the preload and that the fuel passing through the tank Guided oil quantity is significantly reduced, so that a much smaller tank volume and thereby a weight reduction and a cost reduction during oil change is possible.
Es hat sich jedoch gezeigt, dass es bei Dickstoffpumpen durch den Betrieb von Verbrauchern mit Differentialzylindern, z. B. beim Ausfahren der Fahr- zeugabstützung bzw. beim Ausfahren des Mastes zu einer erheblichen Unterversorgung im Saug-Rücklauffilter-System kommen kann. However, it has been shown that in the case of thick matter pumps by the operation of consumers with differential cylinders, z. B. when extending the vehicle support or when extending the mast to a significant undersupply in the suction-return filter system can come.
Um diesen Nachteil zu vermeiden, wird gemäß der Erfindung weiter vorgeschlagen, dass die erste Saugleitung über eine separate, groß dimensionier- te Nachsaugeleitung und einen weiteren Saugfilter mit dem Tank kommuniziert und dass in der Nachsaugeleitung ein in Richtung des weiteren Saugfilters vorgespanntes Nachsaugeventil angeordnet ist. In order to avoid this disadvantage, it is further proposed according to the invention that the first suction line communicates with the tank via a separate, large-sized suction line and a further suction filter and that a suction-suction valve biased in the direction of the further suction filter is arranged in the suction line.
Als weiterer Saugfilter kann dabei der Saugfilter in der zweiten Saugleitung verwendet werden. Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass in mindestens einer der Rücklaufleitungen ein Ölkühler angeordnet ist. Dies ist vor allem dann wichtig, wenn es beim Betrieb zu einer Aufheizung des Hydrauliköls kommt. Weiter wird gemäß einer bevorzugten Ausgestaltung der Erfindung vorgeschlagen, dass in mindestens einer der eingangs- seitig an den Saug-Rücklauffilter angeschlossenen Rücklaufleitungen ein Rückschlagventil angeordnet ist. Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass mindestens eine der Primärpumpen im Primärkreis als Füll- und Speisepumpe einer über eine Reversierpumpe angetriebenen Zweizylinder-Dickstoffpumpe ausgebildet ist. Es handelt sich dabei um einen über die Reversierpumpe geführten geschlossenen Hydraulikkreis, der in der Terminologie der vorliegenden Erfindung zusammen mit der Reversierpumpe den Verbraucher bildet. In diesem Fall ist beispielsweise eine der Rücklaufleitungen als Leckölleitung der Reversierpumpe ausgebildet. Wenn zur Erhöhung der Kühlleistung das Lecköl der Reversierpumpe über einen Ölkühler geleitet werden muss, kann es erforderlich sein, dass in der betreffenden Rücklaufleitung ein Rückschlagventil vorgesehen werden muss, um die Reversierpumpe vor Druckspitzen aus den anderen Rückläufen zu schützen. Zusätzlich muss dann ein Rückschlagventil vorgesehen werden, welches abgangsseitig direkt am Saug-Rücklauffilter angeschlossen wird oder direkt in den Tank führt. As a further suction filter while the suction filter can be used in the second suction line. A preferred embodiment of the invention provides that in at least one of the return lines, an oil cooler is arranged. This is especially important when it comes to heating the hydraulic oil during operation. It is further proposed according to a preferred embodiment of the invention that in at least one of the input side connected to the suction-return filter return lines, a check valve is arranged. A preferred embodiment of the invention provides that at least one of the primary pumps in the primary circuit is designed as a filling and feed pump of a two-cylinder slurry pump driven by a reversing pump. It is a guided over the reversing pump closed hydraulic circuit, which forms the consumer in the terminology of the present invention together with the reversing pump. In this case, for example, one of the return lines is designed as a drain line of the reversible pump. If, to increase the cooling capacity, the reversing pump leakage oil must be routed through an oil cooler, it may be necessary to provide a check valve in the respective return line in order to protect the reversing pump against pressure peaks from the other recirculation. In addition, a check valve must then be provided, which is connected on the outlet side directly to the suction-return filter or leads directly into the tank.
Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, dass eine der Rücklaufleitungen als ausgangsseitig an ein Wechselspülventil der Reversierpumpe angeschlossene Spülölleitung ausgebildet ist, die vorzugsweise über den Ölkühler zum Saug-Rücklauffilter zurückgeführt wird. A further advantageous embodiment of the invention provides that one of the return lines is designed as a flushing oil line connected on the output side to an alternating flush valve of the reversing pump, which is preferably returned to the suction / return filter via the oil cooler.
Grundsätzlich ist es auch möglich, dass eine der hydraulischen Primärpumpen mit der Antriebshydraulik eines Verteilermasts als Verbraucher verbunden ist, dessen Rücklaufleitung eingangsseitig an den Saug-Rücklauffilter angeschlossen ist. In principle, it is also possible that one of the hydraulic primary pumps is connected to the drive hydraulics of a distribution mast as a consumer whose return line is connected on the input side to the suction-return filter.
Vorteilhafterweise ist eine der Primärpumpen oder der Sekundärpumpen mit einem hydraulischen Rührwerkantrieb verbunden, dessen Rücklaufleitung eingangsseitig an den Saug-Rücklauffilter angeschlossen ist. Weiter kann eine der Sekundärpumpen im Sekundärkreis mit der Antriebshydraulik einer Rohrweiche oder eines Schieberventils der Dickstoffpumpe verbunden werden, deren Rücklaufleitung in den Tank mündet. Weiter ist es auch möglich, dass im Sekundärkreis eine separate hydraulische Sekundärpumpe vorge- sehen ist, die mit ihrer Druckseite eingangsseitig an den Saug-Rücklauffilter angeschlossen ist und zumindest einen Teil des erforderlichen Überschussöls liefert. Um sicherzustellen, dass der Saug-Rücklauffilter vor zu großen Druckdifferenzen geschützt wird, ist es von Vorteil, wenn zwischen der Eingangsseite des Saug-Rücklauffilters und dem Tank ein Rückschlag- oder Bypassventil angeordnet ist. Im Folgenden wird die Erfindung anhand der in der Zeichnung in schemati- scher Weise dargestellten Ausführungsbeispiele näher erläutert. Es zeigen Advantageously, one of the primary pumps or secondary pumps is connected to a hydraulic agitator drive whose return line is connected on the input side to the suction-return filter. Furthermore, one of the secondary pumps in the secondary circuit can be connected to the drive hydraulics of a diverter valve or a slide valve of the slurry pump, whose return line opens into the tank. Furthermore, it is also possible for a separate hydraulic secondary pump to be provided in the secondary circuit. see, which is connected with its pressure side input side to the suction-return filter and supplies at least a portion of the required excess oil. To ensure that the suction / return filter is protected from excessive pressure differences, it is advantageous if a check valve or by-pass valve is arranged between the inlet side of the suction / return filter and the tank. In the following the invention will be explained in more detail with reference to the embodiments schematically illustrated in the drawing. Show it
Fig. 1 und 2 hydraulische Schaltungsanordnungen von Hydrauliksystemen zum Ansteuern und Betätigen einer Zweizylinder-Dickstoff- pumpe mit Saug-Rücklauffilter. 1 and 2 hydraulic circuit arrangements of hydraulic systems for driving and operating a two-cylinder high-solids pump with suction-return filter.
Die in den Fig. 1 und 2 gezeigten Hydraulikschaltungen sind für eine Dick- stoffpumpe bestimmt, die zwei Förderzylinder 10,10' aufweist, deren stirnseitige Öffnungen 12,12' in einen nicht dargestellten Materialaufgabebehälter münden und abwechselnd während des Druckhubs über eine Rohrweiche 14 mit einer nicht dargestellten Förderleitung verbindbar sind. Die Förderzylinder 10,10' werden über hydraulische Antriebszylinder 16,16' und die in dem gezeigten Ausführungsbeispiel als Schrägscheiben-Axialkolbenpumpen ausgebildeten hydraulischen Reversierpumpen 18,20 im Gegentakt angetrieben. Zu diesem Zweck sind die Förderkolben 22,22' mit den Antriebskolben 24,24' der Antriebszylinder 16,16' über je eine gemeinsame Kolbenstange 26,26' verbunden. Zwischen den Förderzylindern 10,10' und den Antriebszylindern 16,16' befindet sich ein Wasserkasten 28, durch den die Kolbenstangen 26,26' hindurchgreifen. The hydraulic circuits shown in FIGS. 1 and 2 are intended for a thick matter pump, the two delivery cylinder 10,10 ', the frontal openings 12,12' open into a material feed container, not shown, and alternately during the pressure stroke via a crossover 14 with a conveyor line, not shown, are connectable. The delivery cylinders 10, 10 'are driven in push-pull fashion via hydraulic drive cylinders 16, 16' and the hydraulic reversing pumps 18, 20 designed as swash plate axial piston pumps in the embodiment shown. For this purpose, the delivery pistons 22, 22 'are connected to the drive pistons 24, 24' of the drive cylinders 16, 16 'via a respective common piston rod 26, 26'. Between the delivery cylinders 10,10 'and the drive cylinders 16,16' is a water tank 28 through which the piston rods 26,26 'reach through.
Die Antriebszylinder 16,16' werden bei den gezeigten Ausführungsbeispielen bodenseitig über Hydraulikleitungen 30, 30', 32, 32' eines geschlossenen Hauptkreislaufs mit Hilfe der Reversierpumpen 18,20 mit Hydrauliköl beaufschlagt und sind an ihren stangenseitigen Enden über eine Schaukelölleitung 34 hydraulisch miteinander verbunden. Die Bewegungsrichtung der Antriebskolben 24,24' und damit der Förderkolben 22,22' wird dadurch umgekehrt, dass die Schrägscheiben 18', 20' der Reversierpumpen 18,20 ausgelöst durch ein Umsteuersignal durch ihre Nulllage hindurchschwenken und damit die Förderrichtung des Hydrauliköls in den Hydraulikleitungen 30, 30', 32, 32' des Hauptkreislaufes wechseln. In der Terminologie der vorliegenden Erfindung bilden die Antriebszylinder 16,16' zusammen mit den Reversierpumpen 18,20 einen Verbraucher AH (Antriebshydraulik) des Primärkreises der Zweizylinder-Dickstoffpumpe. Die als Speise- und Füllpumpen ausgebildeten Primärpumpen 36,38 laden den Verbraucherkreislauf AH über die Rückschlagventile 36',36",38',38" auf. Die Primärpumpen 36,38 sind in einem Saug-Rücklaufsystem angeordnet, das eine ausgangsseitig 40" an einen Saug-Rücklauffilter 40 angeschlossene erste Saugleitung 42 aufweist und dessen von den Reversierpumpen 18,20 kommende Leckölleitungen als Rücklaufleitungen 44,44' eingangsseitig 40' an den Saug-Rücklauffilter 40 angeschlossen sind. Eine weitere Rücklauflei- tung 46 ist aus der Antriebshydraulik AH über ein Wechselspülventil 48 und ein Niederdruckbegrenzungsventil 50 abgezweigt und über den Ölkühler 52 und die Leitung 54 zur Eingangsseite 40' des Saug-Rücklauffilters 40 zurückgeführt. Im Primärkreis mit dem Saug-Rücklauffiltersystem ist eine Überschussöl- menge erforderlich, um z. B. Leckölmengen, die über die Leitungen 55 zum Tank 68 fließen, auszugleichen oder um im Rücklauf kurzzeitig fehlende Öl- mengen aufgrund der Kompressibilität des Hydrauliköls auf der Druckseite auszugleichen. Die Überschussölmenge wird zumindest teilweise über eine in einem Sekundärkreis angeordnete, motorisch angetriebene und über mindestens eine zweite Saugleitung 58 mit Hydrauliköl beaufschlagte hydraulische Sekundärpumpe 60,62 erzeugt. Die zweite Saugleitung 58 kommuni- ziert entweder unmittelbar oder über einen Saugfilter 66 mit dem Tank 68. Ausgangsseitig ist der Sekundärkreis an mindestens eine Rücklaufleitung angeschlossen, die entweder in den Tank 68 mündet oder an der Eingangsseite 40' des Saug-Rücklauffilters 40 angeschlossen ist. The drive cylinder 16,16 'are in the embodiments shown on the bottom side via hydraulic lines 30, 30', 32, 32 'of a closed Main circuit using the reversing 18.20 charged with hydraulic oil and are hydraulically connected to each other at their rod-side ends via a swing oil pipe 34. The direction of movement of the drive piston 24,24 'and thus the delivery piston 22,22' is reversed, that the swash plates 18 ', 20' of the Reversierpumpen 18,20 triggered by a Umsteuersignal swing through its zero position and thus the conveying direction of the hydraulic oil in the hydraulic lines 30, 30 ', 32, 32' of the main circuit change. In the terminology of the present invention form the drive cylinder 16,16 'together with the reversing 18,20 a consumer AH (drive hydraulics) of the primary circuit of the two-cylinder slurry pump. The trained as feed and filling pumps primary pumps 36,38 load the consumer circuit AH on the check valves 36 ', 36 ", 38', 38" on. The primary pumps 36,38 are arranged in a suction-return system having an output side 40 "connected to a suction-return filter 40 first suction line 42 and its coming from the reversing 18.20 Leckölleitungen as return lines 44,44 'input side 40' to the A further return line 46 is branched off from the drive hydraulic system AH via an alternating purge valve 48 and a low-pressure limiting valve 50 and returned via the oil cooler 52 and the line 54 to the inlet side 40 'of the suction / return filter 40 The suction / return filter system requires an excess quantity of oil in order, for example, to compensate for leakage oil quantities flowing to the tank 68 via the lines 55 or to compensate for short-term missing oil quantities due to the compressibility of the hydraulic oil on the pressure side is at least partially about one in a Se arranged secondarily arranged, motor-driven and at least one second suction line 58 acted upon by hydraulic oil hydraulic secondary pump 60,62. The second suction line 58 communicates Either directly or via a suction filter 66 with the tank 68. On the output side, the secondary circuit is connected to at least one return line, which either opens into the tank 68 or is connected to the input side 40 'of the suction-return filter 40.
Die verbleibende Überschussölmenge im Saug-Rücklauffilterkreis wird über ein Vorspannventil 70 zum Tank 68 geführt. Das Saug-Rücklauffiltersystem enthält zudem ein Rückschlagventil auf der Eingangsseite 40' des Saug- Rücklauffilters 40, welches als Bypassventil 72 das Filterelement des Saug- Rücklauffilters 40 vor zu großer Druckdifferenz schützt. The remaining amount of excess oil in the suction-return filter circuit is fed via a biasing valve 70 to the tank 68. The suction-return filter system also includes a check valve on the input side 40 'of the suction-return filter 40, which protects as a bypass valve 72, the filter element of the suction-return filter 40 from excessive pressure difference.
Die Vorteile des Saug-Rücklauffiltersystems bestehen vor allem darin, dass durch die Überschussölmenge in Verbindung mit dem Vorspannventil 70 sich optimale Saugverhältnisse für die Primärpumpen im Primärkreis ergeben. Weiter wird das Kaltstartverhalten der Primärpumpen verbessert und die durch den Tank 68 umlaufende Ölmenge reduziert. Letzteres führt dazu, dass das Tankvolumen beispielsweise auf weniger als die Hälfte der sonst üblichen Größe verkleinert und dadurch das Tank- und Ölgewicht sowie die bei einem Ölwechsel auszutauschende Ölmenge reduziert werden. Above all, the advantages of the suction / return filter system consist in the fact that the excess amount of oil in conjunction with the preload valve 70 results in optimum suction conditions for the primary pumps in the primary circuit. Furthermore, the cold start behavior of the primary pumps is improved and the amount of oil circulating through the tank 68 is reduced. The latter means that the tank volume, for example, reduced to less than half the usual size and thus the tank and oil weight and to be exchanged at an oil change amount of oil.
Bei dem in Fig. 1 und 2 gezeigten Ausführungsbeispiel ist auch die Schaltung zur Betätigung und Steuerung des Verteilermasts MH ein Verbraucher des Primärkreises. Die Versorgung der Maststeuerung erfolgt über die weitere Primärpumpe 71 , deren Saugseite über die Leitung 73 an die erste Sauglei- tung 42 am Ausgang 40" des Saug-Rücklauffilters 40 angeschlossen ist und deren Rücklaufleitung 74 über den Ölkühler 52 und die Leitung 54 zur Eingangsseite des Saug-Rücklauffilters zurückgeführt ist. Im Verbraucherteil MH der Maststeuerung kann wahlweise auch die Abstützsteuerung integriert werden, die dafür sorgt, dass die fahrbare Betonpumpe mit ihren hydraulisch betätigbaren Abstützbeinen auf dem Untergrund abgestützt wird. Bei Betonpumpen dieser Art kann es durch den Betrieb von Verbrauchern mit Differentialzylindern, wie sie z. B. zum Ausfahren der Abstützbeine und zum Ausfah- ren des Mastes verwendet werden, zu einer erheblichen Unterversorgung im Saug-Rücklauffiltersystem kommen. Dies wird bei dem gezeigten Ausführungsbeispiel teilweise durch eine große Überschussölmenge kompensiert, die im Sekundärkreislauf mit einer großen Sekundärpumpe 60,62, die an den Tank 68 angeschlossen ist, zum Saug-Rücklauffilter 40 zurückgeführt wird. In the embodiment shown in FIGS. 1 and 2, the circuit for actuating and controlling the distribution boom MH is a consumer of the primary circuit. The supply of the mast control via the further primary pump 71, the suction side is connected via the line 73 to the first Sauglei- 42 at the output 40 "of the suction-return filter 40 and the return line 74 via the oil cooler 52 and the line 54 to the input side of In the load part MH of the mast control, the outrigger control can optionally also be integrated, which ensures that the mobile concrete pump with its hydraulically actuated support legs is supported on the ground Differential cylinders, as used, for example, to extend the support legs and to extend them. ren of the mast are used, come to a significant undersupply in the suction-return filter system. This is partially compensated in the embodiment shown by a large amount of excess oil, which is recycled in the secondary circuit with a large secondary pump 60,62 which is connected to the tank 68 to the suction-return filter 40.
Bei dem in den Fig. 1 gezeigten Ausführungsbeispiel wird hierzu vor allem die Sekundärpumpe 60 verwendet, die zur Ansteuerung eines im Materialaufgabebehälter angeordneten Rührwerks RS als Verbraucher dient, dessen Rücklaufleitung 76 über den Ölkühler 52 und die Ausgangsleitung 54 zum Eingang 40' des Saug-Rücklauffilters 40 zurückgeführt ist. Das Ausführungsbeispiel nach Fig. 2 unterscheidet sich in dieser Hinsicht von Fig. 1 dadurch, dass die Rührwerksteuerung RS mit einer Primärpumpe 61 über das Saug- Rücklauffilter 40 und die erste Saugleitung 42 mit Hydrauliköl versorgt wird und dadurch Bestandteil des Primärkreises ist. Andererseits ist bei dem Ausführungsbeispiel nach Fig. 2 im Sekundärkreis eine eigens für die Bereitstellung der Überschussölmenge bestimmte Sekundärpumpe 62 vorgesehen, deren Saugseite 62' über die zweite Saugleitung 58 und den Saugfilter 66 mit dem Tank 68 kommuniziert und deren Druckseite 62" entweder über den Ölkühler 52 und die Leitung 54 oder über das Rückschlagventil 78 und die Leitung 80 zur Eingangsseite 40' des Saug-Rücklauffilters 40 geführt ist. In the embodiment shown in FIG. 1, the secondary pump 60 is used for this purpose, which serves as a consumer for controlling an arranged in the material feed tank agitator RS whose return line 76 via the oil cooler 52 and the output line 54 to the input 40 'of the suction-return filter 40 is returned. The embodiment of FIG. 2 differs in this respect from Fig. 1 in that the agitator control RS is supplied with a primary pump 61 via the suction-return filter 40 and the first suction line 42 with hydraulic oil and thus is part of the primary circuit. On the other hand, in the embodiment of FIG. 2, a secondary pump 62 dedicated to the provision of the surplus oil is provided, the suction side 62 'communicates with the tank 68 via the second suction line 58 and the suction filter 66 and the pressure side 62 "either via the oil cooler 52 and the line 54 or via the check valve 78 and the line 80 to the input side 40 'of the suction-return filter 40 is guided.
An den Saugfilter 66 kann auch die Hydraulikpumpe 64 für den Hydraulikspeicher 82 der Rohrweichenschaltung RW angeschlossen sein. Der Rück- lauf 84 der Rohrweichenschaltung RW muss allerdings separat zum Tank 68 geführt werden, weil hier für den Saug-Rücklauffilter 40 unzulässige Druckspitzen auftreten. To the suction filter 66 and the hydraulic pump 64 may be connected to the hydraulic accumulator 82 of the tube switch circuit RW. However, the return 84 of the diverter switch RW must be performed separately to the tank 68, because here 40 impermissible pressure peaks occur for the suction-return filter.
Eine weitere Besonderheit der Erfindung besteht darin, dass zumindest ein Teil der Überschussölmenge über eine separate, ausreichend dimensionierte Nachsaugeleitung 86 zur Verfügung gestellt wird. Diese Nachsaugeleitung 86 ist bei dem gezeigten Ausführungsbeispiel an den Saugfilter 66 ange- schlossen, aus welchem die Primärpumpen 36,38,61 ,70 des Primärkreises Hydrauliköl über ein Nachsaugeventil 88 und die erste Saugleitung 42 ansaugen. Die Nachsaugeleitung 86 muss mindestens so bemessen sein, dass bei maximaler Nachsaugemenge die Strömungsgeschwindigkeit in der Nachsaugeleitung nicht über 0,8 m/s ansteigt und der Unterdruck den zulässigen Minimalwert der ansaugenden Primärpumpe von beispielsweise 0,8 bar nicht unterschreitet. Im Übrigen müssen die Nachsaugeleitung 86 und das Nachsaugeventil 88 ausreichend groß dimensioniert sein, weil es einen Betriebszustand geben kann, bei welchem nur die Primärpumpe 71 der Masthydraulik MH in Betrieb ist und der Antrieb für die anderen Hydraulikpumpen abgeschaltet ist. Dabei sind dann auch die Sekundärpumpe 60 bzw. 62 für die Überschussölmenge außer Betrieb. Abhängig davon, ob die Differentialzylinder in der Masthydraulik MH oder in der Abstützhydraulik aus- o- der einfahren, ergibt sich am Saug-Rücklauffilter 40 entweder ein Ölüber- schuss, welcher über das Vorspannventil 70 zum Tank 68 geführt wird, oder es ergibt sich ein Ölmangel, welcher dann über die Nachsaugeleitung 86 und das Nachsaugeventil 88 und den Saugfilter 66 aus dem Tank 68 ausgeglichen werden muss. Das Ausführungsbeispiel nach Fig. 1 enthält zusätzlich die Besonderheit, dass das Lecköl der Reversierpumpen 18,20 zumindest teilweise über den Ölkühler 52 geleitet wird, um hierdurch eine Erhöhung der Kühlleistung zu erhalten. In diesem Fall hat es sich als zweckmäßig erwiesen, dass in der Leckölleitung 44,44' ein Rückschlagventil 90 vorgesehen ist, um die Rever- sierpumpen 18,20 des Verbrauchers AH vor Druckspitzen aus den anderen Rückläufen zu schützen. Außerdem muss dann ein Rückschlagventil 92 vorgesehen werden, welches abgangsseitig direkt an den Eingang 40' des Saug-Rücklauffilters 40 angeschlossen ist oder direkt in den Tank 68 führt. Zusammenfassend ist folgendes festzuhalten: Die Erfindung bezieht sich auf ein Hydrauliksystem, vorzugsweise zum Ansteuern und Betätigen einer Zweizylinder-Dickstoffpumpe. Das Hydrauliksystem umfasst einen Tank 68 zur Aufnahme von Hydrauliköl, einen Primärkreis mit mindestens einem hydraulischen Verbraucher AH, MH, der mindestens eine über eine erste Saugleitung 42 mit Hydrauliköl beaufschlagte Primärpumpe 36,38,61 ,70 aufweist und ausgangsseitig an mindestens eine erste Rücklaufleitung angeschlossen ist und der einen ausgangsseitig mit der ersten Saugleitung 42 kommunizierenden und eingangsseitig mit Rücklauföl aus der mindestens einen Rücklaufleitung beaufschlagten Saug-Rücklauffilter 40 aufweist. Eine Besonderheit der Erfindung besteht darin, dass die erste Saugleitung 42 über eine separate Nachsaugeleitung 86 und ein Saugfilter 66 mit dem Tank 68 kommu- niziert, wobei in der Nachsaugeleitung 86 ein in Richtung Saugfilter 66 vorgespanntes Nachsaugeventil 88 angeordnet ist. Another special feature of the invention is that at least part of the excess oil quantity is made available via a separate, adequately dimensioned suction line 86. This Nachsaugeleitung 86 is attached to the suction filter 66 in the embodiment shown. closed, from which the primary pumps 36,38,61, 70 of the primary circuit suck in hydraulic oil via a Nachsaugeventil 88 and the first suction line 42. The Nachsaugeleitung 86 must be at least so dimensioned that at maximum Nachsaugemenge the flow rate in the Nachsaugeleitung does not rise above 0.8 m / s and the negative pressure does not fall below the permissible minimum value of the priming primary pump, for example, 0.8 bar. Incidentally, the Nachsaugeleitung 86 and the Nachsaugeventil 88 must be sufficiently large, because there may be an operating condition in which only the primary pump 71 of the mast hydraulic MH is in operation and the drive for the other hydraulic pumps is turned off. In this case, then the secondary pump 60 and 62 for the excess oil amount out of service. Depending on whether the differential cylinders in the mast hydraulics MH or in the support hydraulics retract or off, there is either an excess of oil at the suction return filter 40, which is led to the tank 68 via the preload valve 70, or the result is a Lack of oil, which must then be compensated via the Nachsaugeleitung 86 and the Nachsaugeventil 88 and the suction filter 66 from the tank 68. The embodiment according to FIG. 1 additionally contains the special feature that the leakage oil of the reversing pumps 18, 20 is at least partially conducted via the oil cooler 52, in order to obtain an increase in the cooling capacity. In this case, it has proven to be expedient that a check valve 90 is provided in the leak oil line 44, 44 'in order to protect the reversing pumps 18, 20 of the consumer AH from pressure peaks from the other recirculations. In addition, then a check valve 92 must be provided, which is the output side connected directly to the input 40 'of the suction-return filter 40 or leads directly into the tank 68. In summary, the following should be noted: The invention relates to a hydraulic system, preferably for driving and actuating a two-cylinder slurry pump. The hydraulic system includes a tank 68 for receiving hydraulic oil, a primary circuit having at least one hydraulic consumer AH, MH, the at least one acted upon by a first suction line 42 with hydraulic oil primary pump 36,38,61, 70 and the output side is connected to at least one first return line and the one with the output side Having the first suction line 42 communicating and the input side with return oil from the at least one return line acted upon suction-return filter 40. A special feature of the invention is that the first suction line 42 via a separate Nachsaugeleitung 86 and a suction filter 66 communicates with the tank 68, wherein in the Nachsaugeleitung 86 an in the direction of the suction filter 66 biased Nachsaugeventil 88 is arranged.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
10,10' Förderzylinder 10,10 'delivery cylinder
12,12' Öffnungen  12.12 'openings
14 Rohrweiche  14 pipe switch
16,16' Antriebszylinder  16.16 'drive cylinder
18,20 Reversierpumpen  18.20 reversible pumps
18',20' Schrägscheiben  18 ', 20' swash plates
22,22' Förderkolben  22.22 'delivery piston
24,24' Antriebskolben  24.24 'drive piston
26,26' Kolbenstangen  26,26 'piston rods
28 Wasserkasten  28 water tank
30,30',32,32' Hydraulikleitungen (AH)  30,30 ', 32,32' hydraulic pipes (AH)
34 Schaukelölleitung (AH)  34 swing oil pipe (AH)
36, 38 Primärpumpen  36, 38 primary pumps
40 Saug-Rücklauffilter  40 suction return filter
40' Eingangsseite  40 'entrance
40" Ausgangsseite  40 "output side
42 erste Saugleitung  42 first suction line
44,44' Leckölleitungen (Rücklaufleitung) 44.44 'Leakage pipes (return line)
46 Spülleitung (Rücklaufleitung)46 purge line (return line)
48 Wechselspülventil 48 alternating purge valve
50 Niederdruckbegrenzungsventil 50 low-pressure relief valve
52 Ölkühler 52 oil cooler
54 Rücklaufleitung  54 return line
55 Leckölleitungen  55 drain pipes
58 zweite Saugleitung  58 second suction line
60 Sekundärpumpe (RS)  60 secondary pump (RS)
61 Primärpumpe (RS)  61 primary pump (RS)
62 separate Sekundärpumpe 62 separate secondary pump
64 Hydraulikpumpe 66 Saugfilter 64 hydraulic pump 66 suction filter
68 Tank  68 tank
70 Vorspannventil  70 preload valve
71 Primärpumpe (MH)  71 primary pump (MH)
72 Bypassventil  72 bypass valve
73 Saugleitung (MH)  73 suction line (MH)
74 Rücklaufleitung (MH)  74 return line (MH)
76 Rührwerksteuerung (RS)  76 agitator control (RS)
78 Rückschlagventil  78 check valve
80 Rücklaufleitung (S, MH)  80 return line (S, MH)
82 Hydraulikspeicher  82 hydraulic accumulators
84 Rücklaufleitung (RW)  84 return line (RW)
86 Nachsaugeleitung  86 Suction line
88 Nachsaugeventil  88 After-suction valve
90 Rückschlagventil  90 check valve
92 Rückschlagventil  92 check valve
AH Antriebshydraulik (Verbraucher) AH drive hydraulics (consumers)
MH Masthydraulik (Verbraucher)MH Mast Hydraulics (Consumers)
RS Rührwerksteuerung (Verbraucher)RS agitator control (consumer)
RN Rohrweiche (Verbraucher) RN pipe switch (consumer)

Claims

Patentansprüche claims
1 . Hydrauliksystenn, vorzugsweise zum Ansteuern und Betätigen einer Dickstoffpumpe, 1 . Hydrauliksystenn, preferably for driving and operating a slurry pump,
mit einem unter atmosphärischem Druck stehenden Tank (68) zur Aufnahme von Hydrauliköl,  with an atmospheric pressure tank (68) for receiving hydraulic oil,
mit einem mindestens einen hydraulischen Verbraucher (ΑΗ,ΜΗ) umfassenden Primärkreis,  with a primary circuit comprising at least one hydraulic consumer (ΑΗ, ΜΗ),
der mindestens eine motorisch angetriebene, über eine erste Saugleitung (42) mit Hydrauliköl beaufschlagte Primärpumpe the at least one motor-driven, via a first suction line (42) acted upon by hydraulic oil primary pump
(36,38,61 ,71 ) aufweist, (36, 38, 61, 71),
der ausgangsseitig an mindestens eine erste Rücklaufleitung angeschlossen ist  the output side is connected to at least one first return line
und der einen ausgangsseitig mit der ersten Saugleitung (42) kommunizierenden und eingangsseitig mit Rücklauföl aus der mindestens einen Rücklaufleitung beaufschlagten Saug- and the one output side with the first suction line (42) communicating and the input side with return oil from the at least one return line acted upon suction
Rücklauffilter (40) aufweist, Has return filter (40),
mit einer von der ersten Saugleitung (42) abgezweigten, über ein Vorspannventil (70) in den Tank (68) mündenden Zweigleitung,  with a branched off from the first suction line (42), via a biasing valve (70) into the tank (68) opening branch line,
mit einem Sekundärkreis,  with a secondary circuit,
der mindestens eine motorisch angetriebene, über eine zweite the at least one motor-driven, via a second
Saugleitung (58) mit Hydrauliköl beaufschlagte SekundärpumpeSuction line (58) Hydraulic oil acted upon secondary pump
(60,62) aufweist, (60,62),
und der ausgangsseitig an mindestens eine zweite Rücklaufleitung angeschlossen ist,  and the output side is connected to at least one second return line,
wobei die zweite Saugleitung (58) unmittelbar oder über einen Saugfilter (66) mit dem Tank (68) kommuniziert,  wherein the second suction line (58) communicates with the tank (68) directly or via a suction filter (66),
und wobei die zweite Rücklaufleitung entweder in den Tank (68) mündet oder eingangsseitig an den Saug-Rücklauffilter (40) ange- schlössen ist,  and wherein the second return line either opens into the tank (68) or is connected on the input side to the suction-return filter (40),
wobei die erste Saugleitung (42) über eine separate Nachsaugleitung (86) und ein weiteres Saugfilter (66) mit dem Tank (68) kommuniziert und wobei in der Nachsaugeleitung (86) ein in Richtung weiteres Saugfilter (66) vorgespanntes Nachsaugeventil (88) angeordnet ist. wherein the first suction line (42) communicates with the tank (68) via a separate suction line (86) and a further suction filter (66) and wherein in the Nachsaugeleitung (86) in the direction of another suction filter (66) biased Nachsaugeventil (88) is arranged.
Hydrauliksystem nach Anspruch 1 , dadurch gekennzeichnet, dass der weitere Saugfilter dem Saugfilter (66) in der zweiten Saugleitung (58) entspricht. Hydraulic system according to claim 1, characterized in that the further suction filter corresponds to the suction filter (66) in the second suction line (58).
Hydrauliksystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in mindestens einer der zum Saug-Rücklauffilter (40) führenden Rücklaufleitungen ein Ölkühler (52) angeordnet ist. Hydraulic system according to claim 1 or 2, characterized in that in at least one of the suction-return filter (40) leading return lines, an oil cooler (52) is arranged.
4. Hydrauliksystem nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass in mindestens einer der eingangsseitig an den Saug- Rücklauffilter (40) angeschlossenen Rücklaufleitungen ein Rückschlag- ventil (78,90,92) angeordnet ist. 4. Hydraulic system according to one of claims 1 to 3, characterized in that in at least one of the input side to the suction-return filter (40) connected return lines a check valve (78,90,92) is arranged.
5. Hydrauliksystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass mindestens eine der Primärpumpen (36,38) als Füll- und Speisepumpe einer über eine Reversierpumpe (18,20) angetriebe- nen Zweizylinder-Dickstoffpumpe ausgebildet ist. 5. Hydraulic system according to one of claims 1 to 4, characterized in that at least one of the primary pumps (36,38) is designed as a filling and feed pump via a reversing pump (18,20) driven nen two-cylinder slurry pump.
6. Hydrauliksystem nach Anspruch 5, dadurch gekennzeichnet, dass eine der Rücklaufleitungen als Leckölleitung (44,44') der Reversierpumpe (18,20) ausgebildet ist. 6. Hydraulic system according to claim 5, characterized in that one of the return lines as a drain line (44,44 ') of the reversing pump (18,20) is formed.
7. Hydrauliksystem nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass eine der Rücklaufleitungen als ausgangsseitig an ein Wechselspülventil (48) des Primärkreises angeschlossene Spülölleitung (46) ausgebildet ist. 7. Hydraulic system according to claim 5 or 6, characterized in that one of the return lines as the output side to a Wechselspülventil (48) of the primary circuit connected Spülölleitung (46) is formed.
8. Hydrauliksystem nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass eine der Sekundärpumpen (60) mit einem hydraulischen Rührwerkantrieb (RS) verbunden ist, dessen Rücklaufleitung (76) ein- gangsseitig an den Saug-Rücklauffilter (40) angeschlossen ist. 8. Hydraulic system according to one of claims 1 to 7, characterized in that one of the secondary pumps (60) with a hydraulic Stirrer drive (RS) is connected, the return line (76) is connected on the input side to the suction-return filter (40).
9. Hydrauliksystem nach einem der Ansprüche 1 bis 8, dadurch gekenn- zeichnet, dass eine der Primärpumpen (71 ) mit der Antriebshydraulik eines Verteilernnasts (MH) verbunden ist, dessen Rücklaufleitung (74) eingangsseitig an den Saug-Rücklauffilter (40) angeschlossen ist. 9. Hydraulic system according to one of claims 1 to 8, characterized in that one of the primary pumps (71) with the drive hydraulics of a Verteilernnasts (MH) is connected, the return line (74) is connected on the input side to the suction-return filter (40) ,
10. Hydrauliksystem nach einem der Ansprüche 1 bis 9, dadurch gekenn- zeichnet, dass eine Hydraulikpumpe (64) mit der Antriebshydraulik einer Rohrweiche (RW) oder eines Schieberventils der Dickstoffpunnpe verbunden ist, deren Rücklaufleitung (80) in den Tank (68) mündet. 10. Hydraulic system according to one of claims 1 to 9, characterized in that a hydraulic pump (64) is connected to the drive hydraulics of a pipe switch (RW) or a slide valve Dickstoffpunnpe whose return line (80) opens into the tank (68) ,
1 1 . Hydrauliksystem nach einem der Ansprüche 1 bis 10, dadurch ge- kennzeichnet, dass eine der Sekundärpumpen (62) mit ihrer Druckseite eingangsseitig an den Saug-Rücklauffilter (40) angeschlossen ist. 1 1. Hydraulic system according to one of claims 1 to 10, characterized in that one of the secondary pumps (62) with its pressure side is connected on the input side to the suction-return filter (40).
12. Hydrauliksystem nach einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, dass zwischen der Eingangsseite (40') des Saug- Rücklauffilters (40) und dem Tank (68) ein Rückschlag- oder Bypass- ventil (72) angeordnet ist. 12. Hydraulic system according to one of claims 1 to 1 1, characterized in that between the input side (40 ') of the suction return filter (40) and the tank (68) a check valve or by-pass valve (72) is arranged.
EP12746359.4A 2011-09-30 2012-08-15 Hydraulic system with return line suction and boost filter Active EP2761190B1 (en)

Applications Claiming Priority (2)

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DE102011083874A DE102011083874A1 (en) 2011-09-30 2011-09-30 Hydraulic system with suction return filter
PCT/EP2012/065931 WO2013045167A2 (en) 2011-09-30 2012-08-15 Hydraulic system with suction/return filter

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EP (1) EP2761190B1 (en)
JP (1) JP6082745B2 (en)
KR (1) KR101968787B1 (en)
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BR (1) BR112014007470B1 (en)
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WO2013045167A3 (en) 2013-06-27
CN103890411B (en) 2016-11-02
CN103890411A (en) 2014-06-25
WO2013045167A2 (en) 2013-04-04
KR20140078635A (en) 2014-06-25
DE102011083874A1 (en) 2013-04-04
US20140230424A1 (en) 2014-08-21
EP2761190B1 (en) 2017-03-08
BR112014007470B1 (en) 2021-01-19
US9551362B2 (en) 2017-01-24
JP6082745B2 (en) 2017-02-15
BR112014007470A2 (en) 2017-04-04
JP2014530330A (en) 2014-11-17
KR101968787B1 (en) 2019-04-12

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