EP3660304A1 - Pompe à deux cylindres pour liquide epais - Google Patents

Pompe à deux cylindres pour liquide epais Download PDF

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Publication number
EP3660304A1
EP3660304A1 EP19212083.0A EP19212083A EP3660304A1 EP 3660304 A1 EP3660304 A1 EP 3660304A1 EP 19212083 A EP19212083 A EP 19212083A EP 3660304 A1 EP3660304 A1 EP 3660304A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
control block
pump
thick matter
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.)
Granted
Application number
EP19212083.0A
Other languages
German (de)
English (en)
Other versions
EP3660304B1 (fr
Inventor
Johannes Fetzer
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.)
Liebherr Mischtecknik GmbH
Original Assignee
Liebherr Mischtecknik 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 Mischtecknik GmbH filed Critical Liebherr Mischtecknik GmbH
Publication of EP3660304A1 publication Critical patent/EP3660304A1/fr
Application granted granted Critical
Publication of EP3660304B1 publication Critical patent/EP3660304B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
    • F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F04B7/0026—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an oscillating movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
    • F04B9/1176—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
    • F04B9/1178—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B2015/026—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous with a priming plunger or piston ahead of the pumping piston and connected on the same piston rod

Definitions

  • the invention relates to a two-cylinder thick matter pump, in particular for conveying concrete according to the preamble of claim 1.
  • Two-cylinder thick matter pumps usually comprise two delivery cylinders, which are connected to one another in terms of circuitry and are synchronized in their movement sequence so that when one delivery cylinder is pumped, the other delivery cylinder performs a suction stroke. At the end of each stroke, the direction of movement of the cylinder piston is reversed so that there is a constant change between pumping and suction strokes.
  • the suction stroke is used to convey a thick material such as concrete into the suction cylinder.
  • a thick material such as concrete
  • the previously sucked thick matter is pressed out of the now pumping delivery cylinder into a delivery line. So that this process always takes place in the correct manner, there is usually a pipe switch which can be moved back and forth between two switching end positions in order to establish the correct connection between the feed cylinder opening, the feed line connection and the thick material feed.
  • the pipe switch is usually pivoted back and forth between two end positions by means of hydraulically driven swivel cylinders, in which they produce the respectively necessary connection between the cylinder openings of the delivery cylinders and the delivery line connection or the thick material feed.
  • One end of the pipe switch is permanently connected to the delivery line, while the other end covers the cylinder opening of the currently pumping delivery cylinder.
  • the cylinder opening of the suction cylinder is thus open to a prefilling container from which the thick matter is sucked in.
  • the drive cylinders driving the feed cylinders are typically operated hydraulically in the prior art.
  • open hydraulic circuits cf. Figure 1
  • closed hydraulic circuits cf. Figure 2
  • a typical open hydraulic circuit 10 which hydraulically drives the two drive cylinders 12 of the feed cylinders (not shown) of a two-cylinder thick matter pump.
  • the hydraulic pump 18 is shown as an adjustable hydraulic pump 18 which delivers in one direction.
  • the hydraulic pump 18 delivers to the pressure side of a control block 20, in which, as is usually provided, a 4/3-way valve 22 is arranged. Since this is an open hydraulic circuit 10, the returning hydraulic oil from the control block 20 is passed via an oil filter 24 into a hydraulic tank 26.
  • the switching of the piston strokes of the two drive cylinders 12 takes place in a purely hydraulic sequence control. It is characterized by its simplicity and the simple components. However, a comparatively large hydraulic oil volume is necessary.
  • the required hydraulic oil volume depends crucially on how much hydraulic oil is passed through the hydraulic tank 26, since the hydraulic oil must be calmed down by the oil volume before being fed back into the hydraulic circuit 10 in the tank 26.
  • the entire system is therefore extremely maintenance-intensive due to the necessarily large hydraulic tank 26.
  • the control block 20 is comparatively heavy and large in size.
  • the closed hydraulic circuit 10 has the advantage that only a small hydraulic oil volume and thus a smaller hydraulic tank 26 is necessary and that there is no main control block. There is also no limitation to the pump size and the hydraulic filter 24 can be dimensioned comparatively small. On the other hand, it is disadvantageous that the additional feed pump 19 to be provided must feed the hydraulic oil to be fed in at a very high pressure level of, for example, 30 bar. As a result, quite expensive components are required here, the entire system is very complex. A troubleshooting in the hydraulic system 10 or an adjustment of the hydraulic system 10 is extremely complex. Furthermore, the very frequently reversing pump 18 is subject to high loads or alternating loads and thus increased wear.
  • a two-cylinder thick matter pump in particular for conveying concrete, is provided, in which two delivery cylinders alternately deliver the thick matter through a suction line into a delivery line, the delivery cylinders being driven by hydraulically driven drive cylinders.
  • the two-cylinder thick matter pump is characterized in that the drive cylinders are connected via a control block to a first adjustable hydraulic pump which delivers in one direction, the first hydraulic pump being connected on its pressure side to the high pressure side of the control block and on its suction side to the return connection of the control block is that a second adjustable, unidirectional hydraulic pump with a smaller delivery volume than the first hydraulic pump is provided, which is connected on its pressure side to the high-pressure side of the control block and on its suction side to a hydraulic tank, the excess generated by the second hydraulic pump Hydraulic oil is fed out of the hydraulic circuit against a back pressure of a predetermined size to the hydraulic tank.
  • the hydraulic system therefore basically has two adjustable hydraulic pumps, both of which deliver into the high-pressure side of the control block.
  • the larger first hydraulic pump can be selected from a type that is typically used in open hydraulic circuits.
  • the first hydraulic pump is therefore subject to a lower load and is therefore less susceptible to damage and more robust or durable.
  • the first hydraulic pump is used in a closed hydraulic circuit.
  • the size of the smaller second hydraulic pump corresponds approximately to that of the feed pump, as previously described using the Figure 2 shown closed hydraulic circuit was explained according to the prior art.
  • the second hydraulic pump is used as an adjustable hydraulic pump in an open hydraulic circuit.
  • the closed hydraulic circuit is produced according to the invention in the first hydraulic pump in that its suction side is connected to the return connection of the control block.
  • the hydraulic circuit of the two-cylinder thick matter pump according to the invention combines the advantages of the closed and the open hydraulic circuit without the respective disadvantages. Compared to the open hydraulic circuit, the required hydraulic tank volume is reduced or essentially halved, in that only the smaller hydraulic pump draws in from the hydraulic tank, but the larger hydraulic pump does not. In particular in weight-critical applications, for example in mobile concrete pumps with a placing boom, the saving of hydraulic oil is of considerable economic advantage.
  • the system according to the invention stands out due to the use of simpler, more cost-effective and less damage-prone hydraulic pumps which deliver on one side, ie not reversing, which also represents an economic advantage.
  • closed hydraulic circuits known from the prior art require a separate oil circuit for cooling the hydraulic oil, whereas in the system according to the invention cooling can be accommodated in the low-pressure area of the hydraulic circuit or on the low-pressure side of the control block.
  • the Indian The hydraulic circuit of the two-cylinder thick matter pump according to the invention also has the advantage that less cooling is required and comparatively little energy is wasted since a comparatively high hydraulic pressure remains in the closed hydraulic circuit of the first hydraulic pump.
  • the size ratio of the first hydraulic pump to the second hydraulic pump is approximately 5 to 1.
  • the dynamic pressure is generated by a valve which connects the return connection of the control block to the hydraulic tank.
  • the dynamic pressure generated is 3 to 15 bar, in particular approximately 5 bar.
  • the valve thus makes it possible, for example, to keep the return pressure constant at about 5 bar.
  • an oil filter is present, through which the hydraulic oil fed out of the hydraulic circuit is guided.
  • a 4/3-way valve for controlling the drive cylinders is arranged in the control block.
  • a cooling device for cooling the hydraulic oil is provided in the low pressure region between the return connection of the control block and the suction side of the first hydraulic pump.
  • valve, the oil filter, the cooling device and the hydraulic tank are hydraulically connected to one another in series.
  • the excess hydraulic oil generated by the second hydraulic pump discharged to the hydraulic tank via the valve, the oil filter and the oil cooler.
  • FIG. 3 An embodiment of the two-cylinder thick matter pump according to the invention is shown.
  • the reference numeral 10 designates the hydraulic circuit, via which two drive cylinders 12, each driving a feed cylinder, are hydraulically actuated in such a way that the feed cylinders (not shown) alternate the thick matter, usually concrete, through a suction line into a delivery line (not shown) ) promote.
  • the drive cylinders 12 are supplied with hydraulic fluid, usually hydraulic oil, by a control block 20 and are hydraulically connected to one another in order to counter-synchronize the piston strokes.
  • a hydraulic 4/3-way valve 30 arranged in the control block 20 is used for the hydraulic control of the drive cylinders 12 and is supplied with hydraulic oil via an adjustable hydraulic pump 18 which delivers in one direction. This is connected on its pressure side to the high pressure side of the control block 20 or the 4/3-way valve 30.
  • the suction side of the first hydraulic pump 18 is connected to the return connection of the control block 20 or the 4/3-way valve 30, so that the first hydraulic pump 18 is operated in a closed hydraulic circuit.
  • a second hydraulic pump 34 Parallel to the first hydraulic pump 18, a second hydraulic pump 34 is provided, which is about a fifth smaller in size, which also represents an adjustable hydraulic pump that delivers in one direction. This is connected on its suction side to a hydraulic tank 26 in order to take up hydraulic oil from there and to the high pressure side of the control block 20 or into the high pressure line, which connects the pressure side of the first hydraulic pump 18 with the high pressure connection of the control block 20 or the 4/3-way valve 30 connects to feed.
  • both adjustable, one-way hydraulic pumps 18, 34 deliver to the high pressure side of the control block 20.
  • the hydraulic circuit 10 implemented here has the advantage that comparatively little energy is wasted.
  • a comparatively high hydraulic pressure of approximately 25 bar remains in the closed circuit of the first hydraulic pump 18.
  • the hydraulic oil does not need to be cooled as much.
  • the hydraulic pump 18 which is used here only in one direction corresponds to a type of construction which can also be used in a typical open hydraulic circuit. This is cheaper to buy and operate than the hydraulic pumps usually used in closed circuits, which act in both directions. Overall, less hydraulic oil is required than in an open circuit.
  • the system is generally easy to install and comparatively easy to maintain.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)
EP19212083.0A 2018-11-30 2019-11-28 Pompe à substance épaisse à deux cylindres Active EP3660304B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018130480.3A DE102018130480A1 (de) 2018-11-30 2018-11-30 Zweizylinder-Dickstoffpumpe

Publications (2)

Publication Number Publication Date
EP3660304A1 true EP3660304A1 (fr) 2020-06-03
EP3660304B1 EP3660304B1 (fr) 2021-06-16

Family

ID=68731808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19212083.0A Active EP3660304B1 (fr) 2018-11-30 2019-11-28 Pompe à substance épaisse à deux cylindres

Country Status (3)

Country Link
EP (1) EP3660304B1 (fr)
DE (1) DE102018130480A1 (fr)
ES (1) ES2887321T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114352590A (zh) * 2022-01-13 2022-04-15 四川鼎鸿智电装备科技有限公司 一种双缸式液压机构以及压力设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243738A1 (de) * 1982-11-26 1984-05-30 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Hydro-umsteuerung bei zweizylinder-kolbenpumpe
WO1990004103A1 (fr) * 1988-10-05 1990-04-19 Putzmeister-Werk Maschinenfabrik Gmbh Pompe a liquides epais avec organe d'arret en aval
DE19542258A1 (de) * 1995-11-13 1997-05-15 Putzmeister Maschf Verfahren und Vorrichtung zur Steuerung einer Zweizylinder-Dickstoffpumpe
DE10150467A1 (de) * 2001-10-16 2003-04-17 Putzmeister Ag Dickstoffpumpe mit Fördermengenregelung
WO2013178373A1 (fr) * 2012-05-31 2013-12-05 Putzmeister Engineering Gmbh Système hydraulique
DE102013006333A1 (de) * 2013-04-12 2014-10-16 Liebherr-Betonpumpen Gmbh Zweizylinder-Dickstoffpumpe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3840892A1 (de) * 1988-12-05 1990-06-07 Putzmeister Maschf Verfahren und vorrichtung zur steuerung einer zweizylinder-dickstoffpumpe
DE10036202A1 (de) * 2000-07-24 2002-02-07 Putzmeister Ag Dickstoffpumpe
DE102009021833A1 (de) * 2009-05-19 2010-11-25 Robert Bosch Gmbh Hydraulischer Antrieb und Drehschieberventil für einen hydraulischen Antrieb

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243738A1 (de) * 1982-11-26 1984-05-30 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Hydro-umsteuerung bei zweizylinder-kolbenpumpe
WO1990004103A1 (fr) * 1988-10-05 1990-04-19 Putzmeister-Werk Maschinenfabrik Gmbh Pompe a liquides epais avec organe d'arret en aval
DE19542258A1 (de) * 1995-11-13 1997-05-15 Putzmeister Maschf Verfahren und Vorrichtung zur Steuerung einer Zweizylinder-Dickstoffpumpe
DE10150467A1 (de) * 2001-10-16 2003-04-17 Putzmeister Ag Dickstoffpumpe mit Fördermengenregelung
WO2013178373A1 (fr) * 2012-05-31 2013-12-05 Putzmeister Engineering Gmbh Système hydraulique
DE102013006333A1 (de) * 2013-04-12 2014-10-16 Liebherr-Betonpumpen Gmbh Zweizylinder-Dickstoffpumpe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114352590A (zh) * 2022-01-13 2022-04-15 四川鼎鸿智电装备科技有限公司 一种双缸式液压机构以及压力设备

Also Published As

Publication number Publication date
DE102018130480A1 (de) 2020-06-04
EP3660304B1 (fr) 2021-06-16
ES2887321T3 (es) 2021-12-22

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