EP2761190B1 - Hydraulic system with return line suction and boost filter - Google Patents

Hydraulic system with return line suction and boost filter Download PDF

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Publication number
EP2761190B1
EP2761190B1 EP12746359.4A EP12746359A EP2761190B1 EP 2761190 B1 EP2761190 B1 EP 2761190B1 EP 12746359 A EP12746359 A EP 12746359A EP 2761190 B1 EP2761190 B1 EP 2761190B1
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EP
European Patent Office
Prior art keywords
suction
line
return
hydraulic
pump
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.)
Active
Application number
EP12746359.4A
Other languages
German (de)
French (fr)
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EP2761190A2 (en
Inventor
Jan-Martin VEIT
Markus STASS
Werner MÜNZENMAIER
Hans-Peter RENZ
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Putzmeister Engineering GmbH
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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
Priority to DE102011083874A priority Critical patent/DE102011083874A1/en
Application filed by Putzmeister Engineering GmbH filed Critical Putzmeister Engineering GmbH
Priority to PCT/EP2012/065931 priority patent/WO2013045167A2/en
Publication of EP2761190A2 publication Critical patent/EP2761190A2/en
Application granted granted Critical
Publication of EP2761190B1 publication Critical patent/EP2761190B1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/07Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/46Machines, 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
    • E01C19/47Hydraulic cement concrete mixers combined with distributing means specially adapted for road building
    • E01C19/475Distributing means therefor, e.g. boom-and-bucket arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02Installations or systems with accumulators
    • F15B1/027Installations or systems with accumulators having accumulator charging devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04Special measures taken in connection with the properties of the fluid
    • F15B21/041Removal or measurement of solid or liquid contamination, e.g. filtering

Description

  • The invention relates to a slurry pump with a hydraulic system for driving and operating the same.
  • The state of the art DE 195 42 258 A1 discloses a slurry pump with a hydraulic system for driving and actuating the same with two delivery cylinders each containing a delivery cylinders, which open into a material feed container with frontal openings and are alternately connected during a pressure stroke of their delivery piston via a diverter valve or a slide valve of the slurry pump with a delivery line with two in each case a drive piston-containing hydraulic drive cylinders whose drive pistons are connected via a respective common piston rod with the delivery piston and actuated by a Reversierpumpe drive hydraulics of the hydraulic system and controllable, wherein the drive hydraulic forms a primary circuit, and further with a tank under atmospheric pressure for Intake of hydraulic oil.
  • The invention differs from conventional sludge pumps essentially 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 output 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 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 remaining one Excess oil in the suction-return filter system is fed to the tank via the preload valve.
  • With the suction-return filter system is achieved by the excess amount of oil in conjunction with the biasing valve optimum suction conditions for the primary line connected to the first suction line primary pump, that the cold start behavior is improved by the bias and that the guided through the tank amount of oil is significantly reduced, so that a much smaller tank volume and thereby a weight reduction and a cost reduction during oil change is possible.
  • 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.
  • To avoid this disadvantage, it is further proposed according to the invention that the first suction line via a separate, large-sized Nachsaugeleitung and another suction filter communicates with the tank and that in the Nachsaugeleitung a biased in the direction of the further suction filter Nachsaugeventil is arranged.
  • 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.
  • 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 non-return valve in the return line concerned 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.
  • According to the invention, it is provided 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.
  • 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 is, which is connected with its pressure side on the 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
    and 2 hydraulic circuits of hydraulic systems for driving and operating a two-cylinder slurry pump with suction-return filter.
  • The in the Fig. 1 and 2 hydraulic circuits shown are intended for a slurry 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 diverter valve 14 with a delivery 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.
  • 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 Change 30,30 ', 32,32' of the main circuit.
  • 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.
  • In the primary circuit with the suction-return filter system, an excess amount of oil is required to z. As leakage oil quantities flowing through the lines 55 to the tank 68, compensate or to compensate in the return short missing oil quantities due to the compressibility of the hydraulic oil on the pressure side. The surplus oil quantity is generated at least partially via a hydraulic secondary pump 60, 62 which is arranged in a secondary circuit and is driven by a motor and pressurized with hydraulic oil via at least one second suction line 58. 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.
  • 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.
  • 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.
  • At the in Fig. 1 and 2 embodiment shown, the circuit for operating 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 suction line 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 the suction In the consumer part MH of the mast control, optionally also the outrigger control can be integrated, which ensures that the mobile concrete pump with its hydraulically actuated support legs is supported on the underground. as for example for extending the support legs and for extending used in 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.
  • In the in the Fig. 1 In this case, the secondary pump 60 which serves to drive a stirrer RS arranged in the material feed container as a consumer, whose return line 76 is recirculated via the oil cooler 52 and the output line 54 to the inlet 40 'of the suction / return filter 40, is used for this purpose. The embodiment according to Fig. 2 differs in this regard 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 is therefore part of the primary circuit. On the other hand, in the embodiment according to Fig. 2 in the secondary circuit, a dedicated for the provision of the surplus oil amount secondary pump 62 is provided, the suction side 62 'communicates via the second suction line 58 and the suction filter 66 to the tank 68 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.
  • 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.
  • 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 connected to the suction filter 66 in the embodiment shown, 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 extend or retract in the mast hydraulic MH or in the support hydraulics, there is either an excess of oil at the suction return filter 40, which is conducted via the biasing valve 70 to the tank 68, or an oil shortage results, which then via the Nachsaugeleitung 86 and the Nachsaugeventil 88 and the suction filter 66 from the tank 68 must be compensated.
  • The embodiment according to Fig. 1 additionally contains the special feature that the leakage oil of the reversing 18.20 is at least partially passed through the oil cooler 52, thereby obtaining an increase in the cooling capacity. In this case, it has proven to be expedient that in the drain line 44,44 'a check valve 90 is provided to protect the reversing pumps 18,20 of the consumer AH against pressure peaks from the other returns. In addition, then a check valve 92 must be provided, which is the outlet side connected directly to the input 40 'of the suction-return filter 40 or leads directly into the tank 68.
  • In summary, the following is to be noted: The invention relates to a slurry pump with a hydraulic system for driving and operating the same. The hydraulic system includes a tank 68 for receiving hydraulic oil, a primary circuit having at least one hydraulic consumer AH, MH, which has at least one acted upon by a first suction line 42 with hydraulic oil primary pump 36,38,61,70 and the output side connected to at least one first return line and the one 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 communicates via a separate Nachsaugeleitung 86 and a suction filter 66 to the tank 68, wherein in the Nachsaugeleitung 86 a biased toward suction filter 66 Nachsaugeventil 88 is arranged.
  • LIST OF REFERENCE NUMBERS
  • 10.10 '
    delivery cylinders
    12.12 '
    openings
    14
    diverter
    16.16 '
    drive cylinder
    18.20
    Reversierpumpen
    18 ', 20'
    swash plate
    22.22 '
    delivery piston
    24.24 '
    drive piston
    26.26 '
    piston rods
    28
    cistern
    30.30 '32.32'
    Hydraulic lines (AH)
    34
    Swing pipe (AH)
    36.38
    primary pump
    40
    Suction return filter
    40 '
    input side
    40 "
    output side
    42
    first suction line
    44.44 '
    Leakage oil lines (return line)
    46
    Purge line (return line)
    48
    Wechselspülventil
    50
    Low pressure relief valve
    52
    oil cooler
    54
    Return line
    55
    Drain lines
    58
    second suction line
    60
    Secondary pump (RS)
    61
    Primary pump (RS)
    62
    separate secondary pump
    64
    hydraulic pump
    66
    Suction
    68
    tank
    70
    Pre-load valve
    71
    Primary pump (MH)
    72
    bypass valve
    73
    Suction line (MH)
    74
    Return line (MH)
    76
    Agitator control (RS)
    78
    check valve
    80
    Return line (S, MH)
    82
    hydraulic accumulator
    84
    Return line (RW)
    86
    Nachsaugeleitung
    88
    suction valve
    90
    check valve
    92
    check valve
    AH
    Drive hydraulics (consumers)
    MH
    Mast hydraulics (consumers)
    RS
    Agitator control (consumer)
    RN
    Pipe switch (consumer)

Claims (6)

  1. A thick-matter pump with a hydraulic systems for the drive and actuation of the same having two delivery cylinders (10, 10') which contain in each case one delivery piston (22, 22') and which issue at end-side openings (12, 12') into a material-supply vessel and which, by means of a pipe switch (14) or a slide valve of the thick matter pump, are connected to a delivery line alternately during a pressure stroke of their delivery pistons (22, 22'), having two hydraulic drive cylinders (16, 16') which contain in each case one drive piston (24, 24') and the drive pistons (24, 24') of which are connected to the delivery pistons (22, 22') by means of in each case one common piston rod (26, 26') and can be actuated and controlled by means of drive hydraulics (AH) of the hydraulic system that comprise a reversing pump (18, 20), and having a placing boom that can be actuated and controlled by means of boom hydraulics (MH) of the hydraulic system, wherein the drive hydraulics (AH) and the boom hydraulics (MH) form a common primary circuit and further with a tank (68), which is at atmospheric pressure, for accommodating hydraulic oil,
    wherein the primary circuit
    - has at least one motor-driven primary pump (36, 38, 61, 71) that is charged with hydraulic oil via a first suction line (42),
    - is connected at the outlet side to at least one first return line,
    - and has a suction/return filter (40) which communicates at the outlet side with the first suction line (42) and which, at the inlet side, is charged with returned oil from the at least one return line,
    - wherein at least one of the primary pumps (36, 38) is in the form of a charging and feed pump of the working hydraulics (AH) and a further one of the primary pumps (71) is connected to the boom hydraulics (MH), whose return line 74 on the inlet side is connected with the suction/return filter (40),
    wherein a branch line is provided which is branched off from the first suction line (42) and which issues into the tank (68) via a preload valve (70),
    wherein a secondary circuit is provided,
    - which secondary circuit has at least one motor-driven secondary pump (60, 62) which is charged with hydraulic oil via a second suction line (58),
    - and which secondary circuit is connected at the outlet side to at least one second return line,
    - wherein the second suction line (58) communicates with the tank (68) directly or via a further suction filter (66),
    - wherein the second return line either ends in the tank (68) or is connected to the inlet side in the suction/return filter (40),
    - wherein one of the secondary pumps (62) is connected with its pressure side to the inlet of the suction/return filter (40) and/or wherein one of the secondary pumps (60) is connected to a hydraulic stirring mechanism drive (RS), the return line (76) of which is connected to the inlet side of the suction/return filter (40)
    - wherein the first suction line (42) communicates with the tank (68) via a separate replenishment suction line (86) and a further suction filter (66),
    - and wherein a replenishment suction valve (88) is arranged in the replenishment suction line (86), which is preloaded in the direction of the further suction filter (66), which is dimensioned such that an oil deficit in the primary circuit may be compensated.
  2. The thick-matter pump as claimed in claim 1, characterized in that a further one of the return lines is in the form of a scavenging oil line (46) that is connected to the outlet side of a scavenging shuttle valve (48) of the primary circuit.
  3. The thick-matter pump as claimed in claim 1 or 2, characterized in that an oil cooler (52) is arranged in at least one of the return lines that lead to the suction/return filter (40).
  4. The thick-matter pump as claimed in one of claims 1 to 3, characterized in that a check valve (78, 90, 92) is arranged in at least one of the return lines that are connected to the inlet side of the suction/return filter (40).
  5. The thick-matter pump as claimed in one of claims 1 to 4, characterized in that a hydraulic pump (64) is connected to drive hydraulics of the pipe switch (RW) or of the slide valve, the return line (80) of which issues into the tank (68).
  6. The thick-matter pump as claimed in one of claims 1 to 5, characterized in that a check or bypass valve (72) is arranged between the inlet side (40') of the suction/return filter (40) and the tank (68).
EP12746359.4A 2011-09-30 2012-08-15 Hydraulic system with return line suction and boost filter Active EP2761190B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
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

Publications (2)

Publication Number Publication Date
EP2761190A2 EP2761190A2 (en) 2014-08-06
EP2761190B1 true EP2761190B1 (en) 2017-03-08

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US (1) US9551362B2 (en)
EP (1) EP2761190B1 (en)
JP (1) JP6082745B2 (en)
KR (1) KR101968787B1 (en)
CN (1) CN103890411B (en)
BR (1) BR112014007470A2 (en)
DE (1) DE102011083874A1 (en)
WO (1) WO2013045167A2 (en)

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US20140230424A1 (en) 2014-08-21
BR112014007470A2 (en) 2017-04-04
EP2761190A2 (en) 2014-08-06
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WO2013045167A3 (en) 2013-06-27
WO2013045167A2 (en) 2013-04-04

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