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EP2895743A1 - Device for the drive control of a two-cylinder thick matter pump - Google Patents

Device for the drive control of a two-cylinder thick matter pump

Info

Publication number
EP2895743A1
EP2895743A1 EP13732483.6A EP13732483A EP2895743A1 EP 2895743 A1 EP2895743 A1 EP 2895743A1 EP 13732483 A EP13732483 A EP 13732483A EP 2895743 A1 EP2895743 A1 EP 2895743A1
Authority
EP
European Patent Office
Prior art keywords
pressure
line
drive
cylinder
delivery
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
EP13732483.6A
Other languages
German (de)
French (fr)
Other versions
EP2895743B1 (en
Inventor
Wilhelm Hofmann
Werner MÜNZENMAIER
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 EP2895743A1 publication Critical patent/EP2895743A1/en
Application granted granted Critical
Publication of EP2895743B1 publication Critical patent/EP2895743B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F04B7/0026Piston 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109Piston 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B15/023Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00Pumping installations or systems
    • F04B23/02Pumping installations or systems having reservoirs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00Pumping installations or systems
    • F04B23/04Combinations of two or more pumps
    • F04B23/06Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002Hydraulic systems to change the pump delivery
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0076Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means

Definitions

  • the invention relates to a device for controlling the drive of a Zweizylin- the Dickstoffpumpe specified in the preamble of claim 1 genus.
  • Two-cylinder thick matter pumps of this type have two delivery openings opening into a material feed container via end openings, the delivery pistons of which can be actuated alternately by means of hydraulically actuated drive cylinders while carrying out a filling stroke and a delivery stroke.
  • a pipe switch is arranged, which is connected by means of a hydraulic drive mechanism on the inlet side alternately to the opening of one of the delivery cylinder and the opening of the respective other delivery cylinder releases, and the outlet side is connected to a delivery line for the conveyed thick materials.
  • the sludge pump further has a motor-driven hydraulic variable displacement pump which has a suction inlet connected to a reservoir and a high-pressure outlet.
  • the drive cylinders for the delivery pistons can be alternately connected to the high-pressure outlet of the variable-displacement pump via a pressure line, and to the reservoir via a return line via a respective hydraulic connection located at one end thereof by means of a first reversing valve. At the other end, the drive cylinders are connected to each other via a swing oil line.
  • the hydraulic drive mechanism of the pipe switch on a two-sided controlled cylinder arrangement for example in the form of two series Plunger cylinders, their connections via a second reversing valve alternately leading to the high pressure output of the hydraulic variable delivery pressure line and leading to the reservoir return line can be connected.
  • a central control is provided, which responds to end position signals of the passing drive piston at least one of the drive cylinder.
  • the thick matter delivery and the diverter diverter take place alternately in a single-circuit system via the same variable-displacement pump, which can be adjusted continuously between a zero delivery and a predetermined maximum delivery.
  • the adjustment in the thick matter delivery depends on a specified by the operator on a setting, adapted to the demand flow rate, while for the reversal of the pipe switch, regardless of the set in the machine flow rate a defined switching time is sought.
  • the variable displacement pump has a flow regulator, the control input is acted upon in the delivery phase with a variable, adapted to the set flow control pressure, while it is acted upon in the Um Kunststoffphase with a defined Um Kunststoff Kunststoff.
  • control input of the flow control valve in the delivery phase and in the reversal phase must be acted upon with different pressure control signals, including in the prior art designed as a directional valve switch-over valve (SOS valve) is used.
  • SOS valve directional valve switch-over valve
  • a disadvantage of this type of control is that two control signals which are generated independently of one another are used for the regulation of the variable-displacement pump, for the intended selection of which an electromagnetically actuated switch-over valve is required in the course of the conveying and reversing phase. This requires both hardware and control a considerable effort. Proceeding from this, the present invention seeks to improve the known device for controlling the drive of a sludge pump to the effect that a simplification of the hydraulic circuit arrangement can be achieved without loss of functionality.
  • the solution according to the invention consists essentially in that in the pressure line between the high pressure output of the variable displacement pump and the first reversing valve a setting throttle is arranged, that is branched off from the pressure line downstream of the adjusting a directly leading to an adjustment mechanism of the variable displacement control line, and that of the pressure line upstream of the variable throttle is branched off to a supply connection of the second reversing valve connecting line, in which a fixed throttle can be arranged if necessary.
  • a special feature of the invention is therefore that the adjusting mechanism containing a load-sensing controller of the variable displacement is controlled only via a control line, and that thus eliminates the known switch-over valve.
  • the variable displacement pump additionally includes a pressure regulator for regulating the delivery rate when a predetermined maximum pressure at the high-pressure outlet is exceeded. This maximum pressure is always reached when the drive piston reach its end stop in the course of the delivery process and the pressure difference which can be tapped off at the setting throttle becomes zero. This is exactly the state in which the reversal of the pipe switch is initiated via the second reversing valve.
  • the maximum pressure which adjusts itself to the high-pressure outlet of the variable-displacement pump is present at the fixed throttle, leading to a delivery flow leading via the defined flow cross-section of the connecting line to the plunger cylinder which is currently pressurized.
  • This flow can so Preferably over the flow cross section of a fixed throttle in the connecting line and the maximum pressure can be preset that the Rohr Hughesum facedung takes place in a predetermined time, for example, 200 ms. It follows that the variable displacement pump is flow-regulated during the actual delivery process, whereas it is pressure-controlled over the predetermined maximum pressure during the changeover process, unlike previously.
  • a further preferred embodiment of the invention provides that the load-sensing hydraulic has a arranged in the variable displacement, mechanically adjustable swash plate as an adjustment member and connected to the swash plate, the force side spring-assisted pressure compensator, to which the load side, the downstream of the setting throttle branched off control line is connected ,
  • the drive cylinder have at least two responsive to the drive piston cylinder switch sensors, the output side connected to signal inputs of the central control are.
  • the drive mechanism of the pipe switch also has at least one pipe path which responds to the position, the speed or the end positions of the pipe switch. on the output side is connected to a signal input of the central control.
  • the reversing valves are designed as directional control valves with electromagnetic pilot control elements whose pilot control elements are each connected to a control output of the central control.
  • FIG. 1 shows a detail of a two-cylinder slurry pump in partially cut perspective view
  • Fig. 2 is a circuit diagram of a drive hydraulic for the two-cylinder slurry pump.
  • the drive hydraulic system shown in the hydraulic circuit diagram of FIG. 2 is determined for a two-cylinder slurry pump according to FIG. 1.
  • the sludge pump has two delivery cylinders 14, 14 'whose front-side openings 12, 12' open into a material supply container 10.
  • the delivery pistons 16, 16 'of the slurry pump can be actuated alternately in push-pull manner by hydraulically controlled drive cylinders 18, 18' while carrying out a filling stroke (arrow 19 ') and a delivery stroke (arrow 19 "). which is connectable on the inlet side alternately to the opening 12 of one of the delivery cylinders 14 by means of a hydraulic drive mechanism 24, while it releases the opening 12 'of the respective other delivery cylinder 14.
  • the transfer tube 22 is connected to a delivery line 26.
  • a motor 27 driven hydraulic variable displacement pump 28 is provided, which has a suction port 32 connected to a non-pressurized reservoir 30 and a high pressure port 36 connected to a pressure line 34.
  • the drive cylinders 18,18 ' are connected to each other at the other end via a swing oil pipe 44.
  • the hydraulic drive mechanism 24 of the pipe switch 22 comprises two plunger cylinders 46 connected in series, which can be connected alternately via a second changeover valve 48 to the pressure line 34 leading to the high pressure outlet 36 of the hydraulic variable displacement pump 28 and to a return line 50 leading to the reservoir 30.
  • a central control 56 which responds to end position signals of the passing drive pistons 20, 20 'of at least one of the drive cylinders 18, 18' is provided, via which sequence control for the first and the second reversing valves 40, 48 can be triggered.
  • a setting throttle 58 is arranged in the pressure line 34 between the high-pressure outlet 36 of the variable displacement pump 28 and the first reversing valve 40 and is infinitely adjustable by the operator.
  • a peculiarity of the invention is that of the pressure line 34 downstream (58 ') of the setting throttle 58 is fed back directly to an adjusting mechanism 60 of the variable displacement pump 28 leading control line 62, and that of the pressure line 34 upstream (58 ") of the setting 58 a branching to a supply connection 64 of the second reversing valve 48 connecting line 66 is branched off, in which, if necessary, a fixed throttle 68 is arranged.
  • the adjustment mechanism 60 includes a load-sensing hydraulic 70 that provides hydraulic power control in which both the pressure and the flow rate of the adjustment pump 28 are adjusted to the conditions required by the consumer. As a controlled variable, the pressure drop at the setting throttle 58 is used.
  • the load-sensing hydraulic system 70 has a mechanically adjustable swashplate 72 arranged as an adjusting element in the variable-displacement pump 28 and a pressure-compensated spring-based pressure compensator 73 connected to the swash plate 72, to which the downstream side of the adjusting throttle 58 branches off on the load side Control line 62 is connected.
  • the variable displacement pump 28 is infinitely adjustable from zero flow rate to full delivery. In the zero position of the 4/3-way valves formed Um tenuventile 40,48 flows except for leakage oil losses no hydraulic oil through the lines. At the same time, the variable displacement pump 28 maintains a standby pressure.
  • variable displacement pump 28 conveys only so much hydraulic fluid to maintain the currently required delivery pressure at the required delivery volume.
  • the variable displacement pump 28 additionally comprises a pressure regulator, not shown, for regulating the flow rate when a predetermined maximum pressure is exceeded. This Abregelungsfunktion is used in the control of the drive mechanism 24 for the pipe switch 22.
  • the drive cylinder 18,18 'two on the passing drive piston 20,20' responsive Zylinderschaltsensoren Have 52.54, the output side with signal inputs 52 ', 54' of the central control 56 are connected.
  • the anti-knocking mechanism 24 of the pipe switch 22 has a pipe switch sensor 74, which responds to the position, the speed or the end positions of the pipe switch, and which is connected on the output side to a further signal input 74 'of the central control 56.
  • the changeover valves 40, 48 are designed as directional control valves with electromagnetic pilot control elements 76, 78.
  • the pilot control elements are each connected to a control output 76 ', 78' of the central control 56.
  • the control signals for the changeover valves 40, 48 of the delivery piston drive and the tube transfer drive are calculated from the signals coming from the cylinder shift sensors 52, 54 and optionally from the tube deviation sensor 74.
  • hydraulic oil flows from the variable displacement pump 28 via the pressure line 34, the setting throttle 58 and the reversing valve 40 into the drive cylinder 18, 18 'for the delivery piston 16, 16' for the delivery stroke 19.
  • the oil quantity of the variable displacement pump 28 during the Feed phase via the load-sensing hydraulic 70 is set by adjusting a pressure drop across the setting throttle 58 via the control line 62.
  • hydraulic oil flows via the connecting line 66 and the reversing valve 48 into the plunger cylinder 46 performing a pressure stroke Drive piston 20,20 'at their end stops, so that sets the maximum pressure at the high pressure outlet 36 of the variable displacement 28.
  • the amount of oil passing through the connecting line 66 under the effect of the maximum pressure is such that the diverter 22 via the plunger cylinder 46 in a defined time in size 200 ms within the material feed container 10 is reversed. If necessary, a fixed throttle 68 can be arranged in the connecting line for this purpose.
  • the invention relates to a device for controlling the drive of a two-cylinder slurry pump with a arranged in a material feed container 10 manifold 22 and a motor-driven hydraulic variable displacement pump 28, via which both the drive cylinder 18,18 'of the slurry pump and the drive mechanism 24 of the pipe switch are controlled.
  • a special feature of the invention is that a setting throttle 58 is arranged in a pressure line 34 between the high-pressure outlet 36 of the variable displacement pump 28 and the drive cylinders 18, 18 'of the thick matter pump, that of the pressure line 34 downstream of the setting throttle 58 directly to an adjusting mechanism 60 of the variable displacement pump 28 leading control line 62 is fed back and that is branched off from the pressure line 34 upstream of the adjusting throttle 58 leading to a supply port 64 of the cross-over hydraulic connection line 66, in which a fixed throttle 68 may be arranged.
  • This ensures that the oil flow in the delivery phase is flow-regulated, while it is pressure-controlled in the reversal phase.
  • the variable displacement pump 28 additionally comprises a pressure regulator for regulating the flow rate when a predetermined maximum pressure is exceeded.

Landscapes

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

Abstract

The invention relates to a device for the drive control of a two-cylinder thick matter pump having a diverter (22) which is arranged in a material charging container (10) and a motor-driven hydraulic variable displacement pump (28), via which both the drive cylinders (18, 18') of the thick matter pump and the drive mechanism (24) of the diverter are controlled. A special feature of the invention consists in that an adjusting throttle (58) is arranged in a pressure line (34) between the high-pressure outlet (36) of the variable displacement pump (28) and the drive cylinders (18, 18') of the thick matter pump, in that a control line (62) which leads to an adjusting mechanism (60) of the variable displacement pump (28) is coupled back from the pressure line (34) downstream of the adjusting throttle (58), and in that a connecting line (66) which leads to a supply connector (64) of the diverter hydraulics and in which a fixedly adjusted throttle (68) can be arranged is branched off from the pressure line (34) upstream of the adjusting throttle (58). This achieves a situation where the oil flow is regulated in terms of delivery flow in the delivery phase, whereas it is controlled in terms of pressure in the reversing phase. The latter is the case, above all, if the variable displacement pump (28) additionally comprises a pressure regulator for limiting the delivery quantity if a predefined maximum pressure is exceeded.

Description

Vorrichtung zur Antriebssteuerung einer Zweizylinder-Dickstoffpumpe Beschreibung Die Erfindung betrifft eine Vorrichtung zur Antriebssteuerung einer Zweizylin- der-Dickstoffpumpe der im Oberbegriff des Patentanspruchs 1 angegebenen Gattung.  The invention relates to a device for controlling the drive of a Zweizylin- the Dickstoffpumpe specified in the preamble of claim 1 genus.

Zweizylinder-Dickstoffpumpen dieser Art weisen zwei über stirnseitige Öff- nungen in einen Materialaufgabebehälter mündende Förderzylinder auf, deren Förderkolben mittels hydraulisch angesteuerter Antriebszylinder im Gegentakt abwechselnd unter Ausführen eines Füllhubs und eines Förderhubs betätigbar sind. Innerhalb des Materialaufgabebehälters ist eine Rohrweiche angeordnet, die mittels eines hydraulischen Antriebsmechanismus eintritts- seitig abwechselnd an die Öffnung eines der Förderzylinder anschließbar ist und die Öffnung des jeweils anderen Förderzylinders freigibt, und die aus- trittsseitig mit einer Förderleitung für die zu fördernden Dickstoffe verbunden ist. Die Dickstoffpumpe weist ferner eine motorisch angetriebene hydraulische Verstellpumpe auf, die einen mit einem Vorratsbehälter verbundenen Saugeingang und einen Hochdruckausgang aufweist. Two-cylinder thick matter pumps of this type have two delivery openings opening into a material feed container via end openings, the delivery pistons of which can be actuated alternately by means of hydraulically actuated drive cylinders while carrying out a filling stroke and a delivery stroke. Within the material feed container, a pipe switch is arranged, which is connected by means of a hydraulic drive mechanism on the inlet side alternately to the opening of one of the delivery cylinder and the opening of the respective other delivery cylinder releases, and the outlet side is connected to a delivery line for the conveyed thick materials. The sludge pump further has a motor-driven hydraulic variable displacement pump which has a suction inlet connected to a reservoir and a high-pressure outlet.

Die Antriebszylinder für die Förderkolben sind über je einen an ihrem einen Ende befindlichen Hydraulikanschluss abwechselnd mittels eines ersten Um- steuerventils über eine Druckleitung mit dem Hochdruckausgang der Ver- stellpumpe und über eine Rücklaufleitung mit dem Vorratsbehälter verbindbar. An ihrem anderen Ende sind die Antriebszylinder über eine Schaukelölleitung miteinander verbunden. Andererseits weist der hydraulische Antriebsmechanismus der Rohrweiche eine zweiseitig angesteuerte Zylinderanordnung beispielsweise in Form von zwei in Reihe geschalteten Plunger- Zylindern auf, deren Anschlüsse über ein zweites Umsteuerventil abwechselnd an die zum Hochdruckausgang der hydraulischen Verstellpumpe führende Druckleitung und an die zum Vorratsbehälter führende Rücklaufleitung anschließbar sind. Zur Auslösung einer Folgesteuerung für das erste und das zweite Umsteuerventil ist eine Zentralsteuerung vorgesehen, die auf Endlagensignale der vorbeilaufenden Antriebskolben mindestens eines der Antriebszylinder anspricht. The drive cylinders for the delivery pistons can be alternately connected to the high-pressure outlet of the variable-displacement pump via a pressure line, and to the reservoir via a return line via a respective hydraulic connection located at one end thereof by means of a first reversing valve. At the other end, the drive cylinders are connected to each other via a swing oil line. On the other hand, the hydraulic drive mechanism of the pipe switch on a two-sided controlled cylinder arrangement, for example in the form of two series Plunger cylinders, their connections via a second reversing valve alternately leading to the high pressure output of the hydraulic variable delivery pressure line and leading to the reservoir return line can be connected. To trigger a sequence control for the first and the second reversing valve, a central control is provided, which responds to end position signals of the passing drive piston at least one of the drive cylinder.

Die Dickstoffförderung und die Rohrweichenumsteuerung erfolgt abwechselnd in einem Einkreissystem über dieselbe Verstellpumpe, die kontinuierlich zwischen einer Nullförderung und einer vorgegebenen Maximalförderung eingestellt werden kann. Die Einstellung bei der Dickstoffförderung richtet sich nach einer vom Bediener an einem Einstellorgan vorgegebenen, an den Bedarf angepassten Fördermenge, während für die Umsteuerung der Rohrweiche unabhängig von der in der Maschine eingestellten Fördermenge eine definierte Umschaltzeit angestrebt wird. Zur Einstellung des Förderstroms hat die Verstellpumpe einen Förderstromregler, dessen Steuereingang in der Förderphase mit einem variablen, an die eingestellte Fördermenge angepassten Steuerdruck beaufschlagt wird, während er in der Umsteuerphase mit einem definierten Umsteuerdruck beaufschlagt wird. Deshalb muss der Steuereingang des Förderstromreglers in der Förderphase und in der Umsteuerphase mit unterschiedlichen Drucksteuersignalen beaufschlagt wer- den, wozu im Stand der Technik ein als Wegeventil ausgebildetes Switch- Over-Ventil (SOS-Ventil) verwendet wird. Mit anderen Worten heißt dies, dass die Steuersignale für den Förderstromregler an verschiedenen Steuerleitungen anstehen, die in den jeweiligen Betriebsphasen durch ein Umsteuerventil auf den Steuereingang geschaltet werden. The thick matter delivery and the diverter diverter take place alternately in a single-circuit system via the same variable-displacement pump, which can be adjusted continuously between a zero delivery and a predetermined maximum delivery. The adjustment in the thick matter delivery depends on a specified by the operator on a setting, adapted to the demand flow rate, while for the reversal of the pipe switch, regardless of the set in the machine flow rate a defined switching time is sought. To adjust the flow, the variable displacement pump has a flow regulator, the control input is acted upon in the delivery phase with a variable, adapted to the set flow control pressure, while it is acted upon in the Umsteuerphase with a defined Umsteuerdruck. Therefore, the control input of the flow control valve in the delivery phase and in the reversal phase must be acted upon with different pressure control signals, including in the prior art designed as a directional valve switch-over valve (SOS valve) is used. In other words, this means that the control signals for the flow controller are pending on different control lines, which are switched to the control input in the respective operating phases by a reversing valve.

Ein Nachteil dieser Steuerungsart besteht darin, dass für die Regelung der Verstellpumpe zwei unabhängig voneinander erzeugte Steuersignale verwendet werden, für deren bestimmungsgemäße Auswahl im Zuge der Förder- und Umsteuerphase ein elektromagnetisch angesteuertes Switch-Over- Ventil erforderlich ist. Dies erfordert sowohl hardwaremäßig als auch steuerungsmäßig einen erheblichen Aufwand. Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, die bekannte Vorrichtung zur Antriebssteuerung einer Dickstoffpumpe dahingehend zu verbessern, dass eine Vereinfachung der hydraulischen Schaltungsanordnung ohne Einbuße an Funktionstüchtigkeit erzielt werden kann. A disadvantage of this type of control is that two control signals which are generated independently of one another are used for the regulation of the variable-displacement pump, for the intended selection of which an electromagnetically actuated switch-over valve is required in the course of the conveying and reversing phase. This requires both hardware and control a considerable effort. Proceeding from this, the present invention seeks to improve the known device for controlling the drive of a sludge pump to the effect that a simplification of the hydraulic circuit arrangement can be achieved without loss of functionality.

Zur Lösung dieser Aufgabe wird die im Patentanspruch 1 angegebene Merkmalskombination vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen. Die erfindungsgemäße Lösung besteht im Wesentlichen darin, dass in der Druckleitung zwischen dem Hochdruckausgang der Verstellpumpe und dem ersten Umsteuerventil eine Einstelldrossel angeordnet ist, dass von der Druckleitung stromabwärts der Einstelldrossel eine unmittelbar zu einem Verstellmechanismus der Verstellpumpe führende Steuerleitung abgezweigt ist, und dass von der Druckleitung stromaufwärts der Verstelldrossel eine zu einem Versorgungsanschluss des zweiten Umsteuerventils führende Verbindungsleitung abgezweigt ist, in welcher bei Bedarf eine festeingestellte Drossel angeordnet sein kann. Eine Besonderheit der Erfindung besteht also darin, dass der einen Load-Sensing-Regler enthaltende Verstellmechanismus der Verstellpumpe nur über eine Steuerleitung angesteuert wird, und dass damit das bekannte Switch-Over-Ventil entfällt. Dies ist dadurch möglich, dass die Verstellpumpe zusätzlich einen Druckregler zur Abregelung der Fördermenge bei Überschreiten eines vorgegebenen Maximaldrucks am Hochdruckausgang umfasst. Dieser Maximaldruck wird stets dann erreicht, wenn die Antriebskolben im Zuge des Fördervorgangs zu ihrem Endanschlag gelangen und die an der Einstelldrossel abgreifbare Druckdifferenz zu Null wird. Dies ist genau der Zustand, in welchem die Umsteuerung der Rohrweiche über das zweite Umsteuerventil eingeleitet wird. In diesem Fall steht an der Festdrossel der sich am Hochdruckausgang der Verstellpumpe einstel- lende Maximaldruck an, der zu einem über den definierten Strömungsquerschnitt der Verbindungsleitung führenden Förderstrom zu dem im Augenblick mit Druck beaufschlagten Plungerzylinder führt. Dieser Förderstrom kann so vorzugsweise über den Ström ungsquerschnitt einer Festdrossel in der Verbindungsleitung und den Maximaldruck voreingestellt werden, dass die Rohrweichenumsteuerung in einer vorgegebenen Zeit von beispielsweise 200 ms erfolgt. Hieraus folgt, dass die Verstellpumpe während des eigentli- chen Fördervorgangs förderstromgeregelt ist, während sie beim Umsteuervorgang - anders als bisher - über den vorgegebenen Maximaldruck druckgeregelt ist. To solve this problem, the feature combination specified in claim 1 is proposed. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims. The solution according to the invention consists essentially in that in the pressure line between the high pressure output of the variable displacement pump and the first reversing valve a setting throttle is arranged, that is branched off from the pressure line downstream of the adjusting a directly leading to an adjustment mechanism of the variable displacement control line, and that of the pressure line upstream of the variable throttle is branched off to a supply connection of the second reversing valve connecting line, in which a fixed throttle can be arranged if necessary. A special feature of the invention is therefore that the adjusting mechanism containing a load-sensing controller of the variable displacement is controlled only via a control line, and that thus eliminates the known switch-over valve. This is possible because the variable displacement pump additionally includes a pressure regulator for regulating the delivery rate when a predetermined maximum pressure at the high-pressure outlet is exceeded. This maximum pressure is always reached when the drive piston reach its end stop in the course of the delivery process and the pressure difference which can be tapped off at the setting throttle becomes zero. This is exactly the state in which the reversal of the pipe switch is initiated via the second reversing valve. In this case, the maximum pressure which adjusts itself to the high-pressure outlet of the variable-displacement pump is present at the fixed throttle, leading to a delivery flow leading via the defined flow cross-section of the connecting line to the plunger cylinder which is currently pressurized. This flow can so Preferably over the flow cross section of a fixed throttle in the connecting line and the maximum pressure can be preset that the Rohrweichenumsteuerung takes place in a predetermined time, for example, 200 ms. It follows that the variable displacement pump is flow-regulated during the actual delivery process, whereas it is pressure-controlled over the predetermined maximum pressure during the changeover process, unlike previously.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, dass die Load-Sensing-Hydraulik eine in der Verstellpumpe angeordnete, mechanisch verstellbare Schrägscheibe als Versteilglied sowie eine mit der Schrägscheibe verbundene, kraftseitig federgestützte Druckwaage aufweist, an welche lastseitig die stromabwärts der Einstelldrossel abgezweigte Steuerleitung angeschlossen ist. A further preferred embodiment of the invention provides that the load-sensing hydraulic has a arranged in the variable displacement, mechanically adjustable swash plate as an adjustment member and connected to the swash plate, the force side spring-assisted pressure compensator, to which the load side, the downstream of the setting throttle branched off control line is connected ,

Um einen störungsfreien Wechsel zwischen der Förderphase und der Umsteuerphase des Pumpbetriebs der Zweizylinder-Dickstoffpumpe zu gewährleisten, wird gemäß einer bevorzugten Ausgestaltung der Erfindung vorgeschlagen, dass die Antriebszylinder mindestens zwei auf die vorbeilaufenden Antriebskolben ansprechende Zylinderschaltsensoren aufweisen, die aus- gangsseitig mit Signaleingängen der Zentralsteuerung verbunden sind. Mit dieser Maßnahme ist es möglich, den Umsteuervorgang bereits eine gewisse Zeit vor dem Anschlag des Antriebskolbens am Zylinderende auszulösen. Dies ist deshalb notwendig, weil der Umsteuervorgang über die Umsteuer- ventile nur mit einer zeitlichen Verzögerung möglich ist. Auf diese Weise lassen sich Anschläge der Antriebskolben an den Zylinderenden, die zu einem frühzeitigen Verschleiß führen könnten, vermeiden. Entsprechendes gilt auch für die Umsteuerung des ersten Umsteuerventils, die bereits ausgelöst werden sollte, bevor die Plungerzylinder bei der Umsteuerung der Rohrweiche ihre Endlage erreichen. Um dies zu ermöglichen, weist auch der Antriebsmechanismus der Rohrweiche mindestens einen auf die Position, die Geschwindigkeit oder die Endlagen der Rohrweiche ansprechenden Rohrwei- chensensor auf, der ausgangsseitig mit einem Signaleingang der Zentralsteuerung verbunden ist. Um all dies zu erreichen, sind gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung die Umsteuerventile als Wegeventile mit elektromagnetischen Vorsteuerorganen ausgebildet, deren Vor- Steuerorgane mit jeweils einem Steuerausgang der Zentralsteuerung verbunden sind. In order to ensure a trouble-free change between the delivery phase and the Umsteuerphase the pumping operation of the two-cylinder slurry pump, it is proposed according to a preferred embodiment of the invention that the drive cylinder have at least two responsive to the drive piston cylinder switch sensors, the output side connected to signal inputs of the central control are. With this measure, it is possible to trigger the Umsteuervorgang already some time before the stop of the drive piston at the cylinder end. This is necessary because the changeover process via the reversing valves is only possible with a time delay. In this way, stops of the drive piston at the cylinder ends, which could lead to premature wear, avoid. The same applies to the reversal of the first reversing valve, which should already be triggered before the plunger reach its end position in the reversal of the pipe switch. In order to make this possible, the drive mechanism of the pipe switch also has at least one pipe path which responds to the position, the speed or the end positions of the pipe switch. on the output side is connected to a signal input of the central control. In order to achieve all of this, according to a further advantageous embodiment of the invention, the reversing valves are designed as directional control valves with electromagnetic pilot control elements whose pilot control elements are each connected to a control output of the central control.

Im Folgenden wird die Erfindung anhand eines in der Zeichnung in schemati- scher Weise dargestellten Ausführungsbeispiels näher erläutert. Es zeigen In the following, the invention will be explained in more detail with reference to an embodiment shown schematically in the drawing. Show it

Fig. 1 einen Ausschnitt aus einer Zweizylinder-Dickstoffpumpe in teilweise geschnittener schaubildlicher Darstellung; 1 shows a detail of a two-cylinder slurry pump in partially cut perspective view;

Fig. 2 ein Schaltschema einer Antriebshydraulik für die Zweizylinder- Dickstoffpumpe. Fig. 2 is a circuit diagram of a drive hydraulic for the two-cylinder slurry pump.

Die in dem hydraulischen Schaltschema gemäß Fig. 2 dargestellte Antriebshydraulik ist für eine Zweizylinder-Dickstoffpumpe entsprechend Fig. 1 bestimmt. Die Dickstoffpumpe weist zwei Förderzylinder 14,14' auf, deren stirn- seitige Öffnungen 12,12' in einen Materialaufgabebehälter 10 münden. Die Förderkolben 16,16' der Dickstoffpumpe sind mittels hydraulisch angesteuerter Antriebszylinder 18,18' im Gegentakt abwechselnd unter Ausführen eines Füllhubs (Pfeil 19') und eines Förderhubs (Pfeil 19") betätigbar. Innerhalb des Materialaufgabebehälters 10 befindet sich außerdem eine Rohrweiche 22, die mittels eines hydraulischen Antriebsmechanismus 24 eintrittsseitig abwechselnd an die Öffnung 12 eines der Förderzylinder 14 anschließbar ist, während sie die Öffnung 12' des jeweils anderen Förderzylinders 14' freigibt. Austrittsseitig ist die Rohrweiche 22 mit einer Förderleitung 26 verbunden. Außerdem ist eine mittels eines Motors 27 angetriebene hydraulische Ver- stellpumpe 28 vorgesehen, die einen mit einem drucklosen Vorratsbehälter 30 verbundenen Saugeingang 32 und einen an eine Druckleitung 34 angeschlossenen Hochdruckausgang 36 aufweist. Die Antriebszylinder 18,18' sind über je einen an ihrem einen Ende befindlichen Hydraulikanschluss 38,38' abwechselnd mittels eines ersten, als 4/3- Wegeventil ausgebildeten Umsteuerventils 40 über die Druckleitung 34 mit dem Hochdruckausgang 36 der Verstellpumpe 28 und über eine Rücklaufleitung 42 mit dem Vorratsbehälter 30 verbindbar. Außerdem sind die Antriebszylinder 18,18' an ihrem anderen Ende über eine Schaukelölleitung 44 miteinander verbunden. Der hydraulische Antriebsmechanismus 24 der Rohrweiche 22 umfasst zwei in Reihe geschaltete Plungerzylinder 46, die über ein zweites Umsteuerventil 48 abwechselnd an die zum Hochdruckausgang 36 der hydraulischen Verstellpumpe 28 führende Druckleitung 34 und an eine zum Vorratsbehälter 30 führende Rücklaufleitung 50 anschließbar sind. Weiter ist eine auf Endlagen- Signale der vorbeilaufenden Antriebskolben 20,20' mindestens eines der Antriebszylinder 18,18' ansprechende Zentralsteuerung 56 vorgesehen, über die eine Folgesteuerung für das erste und das zweite Umsteuerventil 40,48 auslösbar ist. Für die Förderstromsteuerung der Dickstoffpumpe ist in der Druckleitung 34 zwischen dem Hochdruckausgang 36 der Verstellpumpe 28 und dem ersten Umsteuerventil 40 eine Einstelldrossel 58 angeordnet, die vom Bediener stufenlos verstellbar ist. Eine Besonderheit der Erfindung besteht darin, dass von der Druckleitung 34 stromabwärts (58') der Einstelldrossel 58 eine unmit- telbar zu einem Verstellmechanismus 60 der Verstellpumpe 28 führende Steuerleitung 62 zurückgekoppelt ist, und dass von der Druckleitung 34 stromaufwärts (58") der Einstelldrossel 58 eine zu einem Versorgungsan- schluss 64 des zweiten Umsteuerventils 48 führende Verbindungsleitung 66 abgezweigt ist, in welcher bei Bedarf eine fest eingestellte Drossel 68 ange- ordnet ist. Der Verstellmechanismus 60 umfasst eine Load-Sensing-Hydraulik 70, die eine hydraulische Leistungsregelung bewirkt, bei der sowohl der Druck als auch der Volumenstrom der Verstellpunnpe 28 an die vom Verbraucher geforderten Bedingungen angepasst werden. Als Regelgröße wird der Druckab- fall an der Einstelldrossel 58 verwendet. The drive hydraulic system shown in the hydraulic circuit diagram of FIG. 2 is determined for a two-cylinder slurry pump according to FIG. 1. The sludge pump has two delivery cylinders 14, 14 'whose front-side openings 12, 12' open into a material supply container 10. The delivery pistons 16, 16 'of the slurry pump can be actuated alternately in push-pull manner by hydraulically controlled drive cylinders 18, 18' while carrying out a filling stroke (arrow 19 ') and a delivery stroke (arrow 19 "). which is connectable on the inlet side alternately to the opening 12 of one of the delivery cylinders 14 by means of a hydraulic drive mechanism 24, while it releases the opening 12 'of the respective other delivery cylinder 14. On the outlet side, the transfer tube 22 is connected to a delivery line 26. In addition, one is by means of a motor 27 driven hydraulic variable displacement pump 28 is provided, which has a suction port 32 connected to a non-pressurized reservoir 30 and a high pressure port 36 connected to a pressure line 34. The drive cylinders 18, 18 'are alternately connected by means of a first reversing valve 40 formed as a 4/3-way valve via the pressure line 34 to the high-pressure outlet 36 of the variable-displacement pump 28 and via a return line 42 via a respective hydraulic connection 38, 38' connectable to the reservoir 30. In addition, the drive cylinders 18,18 'are connected to each other at the other end via a swing oil pipe 44. The hydraulic drive mechanism 24 of the pipe switch 22 comprises two plunger cylinders 46 connected in series, which can be connected alternately via a second changeover valve 48 to the pressure line 34 leading to the high pressure outlet 36 of the hydraulic variable displacement pump 28 and to a return line 50 leading to the reservoir 30. In addition, a central control 56 which responds to end position signals of the passing drive pistons 20, 20 'of at least one of the drive cylinders 18, 18' is provided, via which sequence control for the first and the second reversing valves 40, 48 can be triggered. For the delivery flow control of the slurry pump, a setting throttle 58 is arranged in the pressure line 34 between the high-pressure outlet 36 of the variable displacement pump 28 and the first reversing valve 40 and is infinitely adjustable by the operator. A peculiarity of the invention is that of the pressure line 34 downstream (58 ') of the setting throttle 58 is fed back directly to an adjusting mechanism 60 of the variable displacement pump 28 leading control line 62, and that of the pressure line 34 upstream (58 ") of the setting 58 a branching to a supply connection 64 of the second reversing valve 48 connecting line 66 is branched off, in which, if necessary, a fixed throttle 68 is arranged. The adjustment mechanism 60 includes a load-sensing hydraulic 70 that provides hydraulic power control in which both the pressure and the flow rate of the adjustment pump 28 are adjusted to the conditions required by the consumer. As a controlled variable, the pressure drop at the setting throttle 58 is used.

Bei dem gezeigten Ausführungsbeispiel weist die Load-Sensing-Hydraulik 70 eine in der Verstellpumpe 28 angeordnete, mechanisch verstellbare Schrägscheibe 72 als Versteilglied sowie eine mit der Schrägscheibe 72 verbunde- ne, kraftseitig federgestützte Druckwaage 73 auf, an welche lastseitig die stromabwärts der Einstelldrossel 58 abgezweigte Steuerleitung 62 angeschlossen ist. Die Verstellpumpe 28 ist stufenlos von Nullförderleistung bis Vollförderung verstellbar. In der Nullstellung der als 4/3-Wegeventile ausgebildeten Umsteuerventile 40,48 fließt ausgenommen von Leckölverlusten kein Hydraulikol durch die Leitungen. Gleichzeitig hält die Verstellpumpe 28 einen Standby-Druck aufrecht. Wird nun durch Öffnen eines der Umsteuerventile 40,48 Hydraulikflüssigkeit in die Antriebe im Bereich der Antriebszylinder 18,18' oder im Bereich der Plungerzylinder 46 geleitet, so wird die Förderleistung der Verstellpumpe 28 automatisch erhöht. Die Verstellpumpe 28 fördert jeweils nur so viel Hydraulikflüssigkeit, um bei dem benötigten Fördervolumen den aktuell benötigten Förderdruck aufrechtzuerhalten. Eine Besonderheit der Erfindung besteht darin, dass die Verstellpumpe 28 zusätzlich einen nicht dargestellten Druckregler zur Abregelung der Fördermenge bei Überschreiten eines vorgegebenen Maximaldrucks umfasst. Diese Abregelungsfunktion wird bei der Ansteuerung des Antriebsmechanismus 24 für die Rohrweiche 22 genutzt. In the exemplary embodiment shown, the load-sensing hydraulic system 70 has a mechanically adjustable swashplate 72 arranged as an adjusting element in the variable-displacement pump 28 and a pressure-compensated spring-based pressure compensator 73 connected to the swash plate 72, to which the downstream side of the adjusting throttle 58 branches off on the load side Control line 62 is connected. The variable displacement pump 28 is infinitely adjustable from zero flow rate to full delivery. In the zero position of the 4/3-way valves formed Umsteuerventile 40,48 flows except for leakage oil losses no hydraulic oil through the lines. At the same time, the variable displacement pump 28 maintains a standby pressure. If hydraulic fluid is now conducted into the drives in the area of the drive cylinders 18, 18 'or in the area of the plunger cylinders 46 by opening one of the changeover valves 40, 48, the delivery rate of the variable displacement pump 28 is automatically increased. The variable displacement pump 28 conveys only so much hydraulic fluid to maintain the currently required delivery pressure at the required delivery volume. A special feature of the invention is that the variable displacement pump 28 additionally comprises a pressure regulator, not shown, for regulating the flow rate when a predetermined maximum pressure is exceeded. This Abregelungsfunktion is used in the control of the drive mechanism 24 for the pipe switch 22.

Aus Fig. 2 ist zu ersehen, dass die Antriebszylinder 18,18' zwei auf die vorbeilaufenden Antriebskolben 20,20' ansprechende Zylinderschaltsensoren 52,54 aufweisen, die ausgangsseitig mit Signaleingängen 52', 54' der Zentralsteuerung 56 verbunden sind. Weiter weist der Antnebsmechanismus 24 der Rohrweiche 22 einen auf die Position, die Geschwindigkeit oder die Endlagen der Rohrweiche ansprechenden Rohrweichensensor 74 auf, der aus- gangsseitig mit einem weiteren Signaleingang 74' der Zentralsteuerung 56 verbunden ist. Die Umsteuerventile 40,48 sind als Wegeventile mit elektromagnetischen Vorsteuerorganen 76,78 ausgebildet. Die Vorsteuerorgane sind mit jeweils einem Steuerausgang 76', 78' der Zentralsteuerung 56 verbunden. Die Ansteuersignale für die Umsteuerventile 40,48 des Förderkol- benantriebs und des Rohrweichenantriebs werden aus den von den Zylinderschaltsensoren 52,54 und gegebenenfalls vom Rohrweichensensor 74 kommenden Signalen errechnet. From Fig. 2 it can be seen that the drive cylinder 18,18 'two on the passing drive piston 20,20' responsive Zylinderschaltsensoren Have 52.54, the output side with signal inputs 52 ', 54' of the central control 56 are connected. Furthermore, the anti-knocking mechanism 24 of the pipe switch 22 has a pipe switch sensor 74, which responds to the position, the speed or the end positions of the pipe switch, and which is connected on the output side to a further signal input 74 'of the central control 56. The changeover valves 40, 48 are designed as directional control valves with electromagnetic pilot control elements 76, 78. The pilot control elements are each connected to a control output 76 ', 78' of the central control 56. The control signals for the changeover valves 40, 48 of the delivery piston drive and the tube transfer drive are calculated from the signals coming from the cylinder shift sensors 52, 54 and optionally from the tube deviation sensor 74.

Während der Förderphase fließt Hydraulikol von der Verstellpumpe 28 über die Druckleitung 34, die Einstelldrossel 58 und das Umsteuerventil 40 in den Antriebszylinder 18,18' für den einen Förderhub 19" ausführenden Förderkolben 16,16'. Dementsprechend wird die Ölmenge der Verstellpumpe 28 während der Förderphase über die Load-Sensing-Hydraulik 70 durch Einstellung eines Druckabfalls an der Einstelldrossel 58 über die Steuerleitung 62 eingestellt. Während der Rohrweichenbewegung fließt Hydraulikol über die Verbindungsleitung 66 und das Umsteuerventil 48 in den einen Druckhub ausführenden Plungerzylinder 46. In dieser Phase befinden sich die Antriebskolben 20,20' an ihren Endanschlägen, so dass sich am Hochdruckausgang 36 der Verstellpumpe 28 der Maximaldruck einstellt. Die unter der Einwirkung des Maximaldrucks durch die Verbindungsleitung 66 gelangende Ölmenge ist so bemessen, dass die Rohrweiche 22 über die Plungerzylinder 46 in einer definierten Zeit in der Größenordnung von 200 ms innerhalb des Materialaufgabebehälters 10 umgesteuert wird. Bei Bedarf kann hierfür in der Verbindungsleitung eine Festdrossel 68 angeordnet werden. During the delivery phase, hydraulic oil flows from the variable displacement pump 28 via the pressure line 34, the setting throttle 58 and the reversing valve 40 into the drive cylinder 18, 18 'for the delivery piston 16, 16' for the delivery stroke 19. The oil quantity of the variable displacement pump 28 during the Feed phase via the load-sensing hydraulic 70 is set by adjusting a pressure drop across the setting throttle 58 via the control line 62. During the tube diverter movement, hydraulic oil flows via the connecting line 66 and the reversing valve 48 into the plunger cylinder 46 performing a pressure stroke Drive piston 20,20 'at their end stops, so that sets the maximum pressure at the high pressure outlet 36 of the variable displacement 28. The amount of oil passing through the connecting line 66 under the effect of the maximum pressure is such that the diverter 22 via the plunger cylinder 46 in a defined time in size 200 ms within the material feed container 10 is reversed. If necessary, a fixed throttle 68 can be arranged in the connecting line for this purpose.

Zusammenfassend ist folgendes festzuhalten: Die Erfindung bezieht sich auf eine Vorrichtung zur Antriebssteuerung einer Zweizylinder-Dickstoffpumpe mit einer in einem Materialaufgabebehälter 10 angeordneten Rohrweiche 22 und einer motorisch angetriebenen hydraulischen Verstellpumpe 28, über die sowohl die Antriebszylinder 18,18' der Dickstoffpumpe als auch der Antriebsmechanismus 24 der Rohrweiche angesteuert werden. Eine Besonder- heit der Erfindung besteht darin, dass in einer Druckleitung 34 zwischen dem Hochdruckausgang 36 der Verstellpumpe 28 und den Antriebszylindern 18,18' der Dickstoffpumpe eine Einstelldrossel 58 angeordnet ist, dass von der Druckleitung 34 stromabwärts der Einstelldrossel 58 eine unmittelbar zu einem Verstellmechanismus 60 der Verstellpumpe 28 führende Steuerleitung 62 zurückgekoppelt ist und dass von der Druckleitung 34 stromaufwärts der Einstelldrossel 58 eine zu einem Versorgungsanschluss 64 der Rohrweichenhydraulik führende Verbindungsleitung 66 abgezweigt ist, in welcher eine fest eingestellte Drossel 68 angeordnet sein kann. Damit wird erreicht, dass der Ölfluss in der Förderphase förderstromgeregelt ist, während er in der Umsteuerphase druckgeregelt ist. Letzteres ist vor allem dann der Fall, wenn die Verstellpumpe 28 zusätzlich einen Druckregler zur Abregelung der Fördermenge bei Überschreiten eines vorgegebenen Maximaldrucks um- fasst. In summary, the following should be noted: The invention relates to a device for controlling the drive of a two-cylinder slurry pump with a arranged in a material feed container 10 manifold 22 and a motor-driven hydraulic variable displacement pump 28, via which both the drive cylinder 18,18 'of the slurry pump and the drive mechanism 24 of the pipe switch are controlled. A special feature of the invention is that a setting throttle 58 is arranged in a pressure line 34 between the high-pressure outlet 36 of the variable displacement pump 28 and the drive cylinders 18, 18 'of the thick matter pump, that of the pressure line 34 downstream of the setting throttle 58 directly to an adjusting mechanism 60 of the variable displacement pump 28 leading control line 62 is fed back and that is branched off from the pressure line 34 upstream of the adjusting throttle 58 leading to a supply port 64 of the cross-over hydraulic connection line 66, in which a fixed throttle 68 may be arranged. This ensures that the oil flow in the delivery phase is flow-regulated, while it is pressure-controlled in the reversal phase. The latter is especially the case when the variable displacement pump 28 additionally comprises a pressure regulator for regulating the flow rate when a predetermined maximum pressure is exceeded.

Bezugszeichenliste LIST OF REFERENCE NUMBERS

10 Materialaufgabebehälter10 material supply containers

12,12' Öffnungen (Förderzylinder)12,12 'openings (delivery cylinder)

14,14' Förderzylinder 14,14 'delivery cylinder

16,16' Förderkolben  16.16 'delivery piston

18,18' Antriebszylinder  18.18 'drive cylinder

19' Füllhub  19 'filling stroke

19" Förderhub  19 "delivery stroke

20,20' Antriebskolben  20.20 'drive piston

22 Rohrweiche  22 pipe switch

24 Antriebsmechanismus 24 drive mechanism

26 Förderleitung 26 support line

27 Motor  27 engine

28 Verstellpumpe  28 variable displacement pump

30 Vorratsbehälter  30 storage tanks

32 Saugeingang  32 suction inlet

34 Druckleitung  34 pressure line

36 Hochdruckausgang 36 high pressure outlet

38,38' Hydraulikanschluss38.38 'hydraulic connection

40 erstes Umsteuerventil40 first reversing valve

42 Rücklaufleitung 42 return line

44 Schaukelölleitung  44 swing oil pipe

46 Plungerzylinder  46 plunger cylinders

48 zweites Umsteuerventil 48 second reversing valve

50 Rücklaufleitung 50 return line

52,54 Zylinderschaltsensoren 52.54 cylinder shift sensors

52',54' Endlagensignale 52 ', 54' end position signals

56 Zentralsteuerung  56 central control

58 Einstelldrossel  58 setting throttle

58' stromabwärts  58 'downstream

58" stromaufwärts Verstellmechanismus58 "upstream adjustment

Steuerleitungcontrol line

Versorgungsanschlusssupply terminal

Verbindungsleitungconnecting line

Drossel (fest eingestellt)Throttle (fixed)

Load-Sensing-HydraulikLoad-sensing hydraulics

Schrägscheibe swash plate

Druckwaage pressure compensator

Rohrweichensensor ' SignaleingangPipe softness sensor 'signal input

,78 Vorsteuerorgane ',78' Steuerausgänge '78 pilot control', 78 'control outputs

Claims

Patentansprüche claims 1 . Vorrichtung zur Antriebssteuerung einer Zweizylinder-Dickstoffpunnpe mit zwei über stirnseitige Öffnungen in einen Materialaufgabebehäl- ter (10) mündenden Förderzylindern (14,14'), deren Förderkolben1 . Device for controlling the drive of a two-cylinder thick-matter pump with two delivery cylinders (14, 14 ') opening into a material feed container (10) via end-side openings, their delivery pistons (16,16') mittels hydraulisch angesteuerter Antriebszylinder (18,18') im Gegentakt abwechselnd unter Ausführen eines Füllhubs (19') und eines Förderhubs (19") betätigbar sind, (16,16 ') by means of hydraulically driven drive cylinder (18,18') in push-pull alternately under execution of a Füllhubs (19 ') and a delivery stroke (19 ") are actuated, mit einer innerhalb des Materialaufgabebehälters (10) angeordne- ten, mittels eines hydraulischen Antriebsmechanismus (24) ein- trittsseitig abwechselnd an die Öffnung (12) eines der Förderzylinder (14,14') anschließbaren und die Öffnung (12') des jeweils anderen Förderzylinders (14,14') freigebenden, austrittsseitig mit einer Förderleitung (26) verbundenen Rohrweiche (22),  with a arranged within the material feed container (10) by means of a hydraulic drive mechanism (24) on the inlet side alternately connected to the opening (12) of the delivery cylinder (14,14 ') and the opening (12') of the other conveyor cylinder (14,14 ') releasing, on the outlet side with a feed line (26) connected to diverter (22), - mit einer motorisch angetriebenen hydraulischen Verstellpumpe - with a motor-driven hydraulic variable pump (28), die einen mit einem drucklosen Vorratsbehälter (30) verbundenen Saugeingang (32) und einen Hochdruckausgang (36) aufweist, (28) having a suction inlet (32) connected to a non-pressurized reservoir (30) and a high-pressure outlet (36), wobei die Antriebszylinder (18,18') über je einen an ihrem einen Ende befindlichen Hydraulikanschluss (38,38') abwechselnd mittels eines ersten Umsteuerventils (40) über eine Druckleitung (34) mit dem Hochdruckausgang (36) der Verstellpumpe (28) und über eine Rücklaufleitung (50) mit dem Vorratsbehälter (30) verbindbar sind, wobei die Antriebszylinder (18,18') an ihrem anderen Ende über ei- ne Schaukelölleitung (44) miteinander verbunden sind,  wherein the drive cylinder (18,18 ') via one at each end located at a hydraulic connection (38,38') alternately by means of a first reversing valve (40) via a pressure line (34) with the high pressure outlet (36) of the variable displacement pump (28) and via a return line (50) with the reservoir (30) are connectable, wherein the drive cylinder (18,18 ') at its other end via a swing oil pipe (44) are interconnected, wobei der hydraulische Antriebsmechanismus (24) der Rohrweiche (22) eine zweiseitig angesteuerte Zylinderanordnung aufweist, deren Anschlüsse über ein zweites Umsteuerventil (48) abwechselnd an die zum Hochdruckausgang (36) der hydraulischen Verstell- pumpe (28) führende Druckleitung (34) und an die zum Vorratsbehälter (30) führende Rücklaufleitung (50) anschließbar sind, und mit einer auf Endlagensignale der vorbeilaufenden Antriebskolben (20,20') mindestens eines der Antriebszylinder (18,18') ansprechenden Zentralsteuerung (56) zur Auslösung einer Folgesteuerung für das erste und das zweite Umsteuerventil (48), wherein the hydraulic drive mechanism (24) of the pipe switch (22) has a two-sided controlled cylinder arrangement whose connections via a second reversing valve (48) alternately to the high pressure output (36) of the hydraulic adjusting pump (28) leading the pressure line (34) and leading to the reservoir (30) leading return line (50) are connectable, and with a central control (56) responsive to end position signals of the passing drive pistons (20, 20 ') of at least one of the drive cylinders (18, 18') for triggering a sequential control for the first and the second changeover valve (48), dadurch gekennzeichnet, characterized, dass in der Druckleitung (34) zwischen dem Hochdruckausgang (36) der Verstellpumpe (28) und dem ersten Umsteuerventil (40) eine Einstelldrossel (58) angeordnet ist,  in that a setting throttle (58) is arranged in the pressure line (34) between the high-pressure outlet (36) of the variable-displacement pump (28) and the first reversing valve (40), dass von der Druckleitung (34) stromabwärts (58') der Einstelldrossel (58) eine unmittelbar zu einem Verstellmechanismus (60) der Verstellpumpe (28) führende Steuerleitung (62) zurückgekoppelt ist, und dass von der Druckleitung (34) stromaufwärts (58") der Einstelldrossel (58) eine zu einem Versorgungsanschluss (64) des zweiten Umsteuerventils (48) führende Verbindungsleitung (66) abgezweigt ist.  in that a control line (62) leading directly to an adjusting mechanism (60) of the variable displacement pump (28) is fed back from the pressure line (34) downstream (58 ') of the setting throttle (58), and that from the pressure line (34) upstream (58 ". ) of the setting throttle (58) is branched off to a supply connection (64) of the second change-over valve (48) leading connecting line (66). Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass in der Verbindungsleitung (66) eine festeingestellte Drossel (68) angeordnet ist. Apparatus according to claim 1, characterized in that in the connecting line (66) a fixed throttle (68) is arranged. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zweiseitig angesteuerte Zylinderanordnung zwei in Reihe geschaltete Plungerzylinder umfasst, deren Anschlüsse mit dem zweiten Umsteuerventil verbunden sind. Apparatus according to claim 1 or 2, characterized in that the two-sided controlled cylinder arrangement comprises two series-connected plunger cylinder whose connections are connected to the second reversing valve. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verstellpumpe (28) einen Druckregler zur Abrege- lung der Fördermenge bei Überschreiten eines vorgegebenen Maximaldrucks umfasst. Device according to one of claims 1 to 3, characterized in that the variable displacement pump (28) comprises a pressure regulator for Abregulation of the delivery rate when exceeding a predetermined maximum pressure. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Verstellmechanismus (60) eine über den Druckab- fall an der Einstelldrossel (58) als Regelgröße angesteuerte Load- Sensing-Hydraulik (70) umfasst. Device according to one of claims 1 to 4, characterized in that the adjusting mechanism (60) over the Druckab- case at the setting throttle (58) controlled as a controlled variable load sensing hydraulic (70). Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Load-Sensing-Hydraulik (70) eine in der Verstell pumpe (28) angeordnete, mechanisch verstellbare Schrägscheibe (72) als Versteilglied sowie eine mit der Schrägscheibe (72) verbundene kraftseitig federgestützte Druckwaage (73) aufweist, an welche lastseitig die stromabwärts (58') der Einstelldrossel (58) abgezweigte Steuerleitung (62) angeschlossen ist. Apparatus according to claim 5, characterized in that the load-sensing hydraulics (70) in a displacement pump (28) arranged, mechanically adjustable swash plate (72) as an adjusting member and connected to the swash plate (72) on the power side spring-assisted pressure compensator (73 ), to which the load side, the downstream (58 ') of the setting throttle (58) branched off control line (62) is connected. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Antriebszylinder (18,18') mindestens zwei auf die vorbeilaufenden Antriebskolben (20,20') ansprechende Zylinderschaltsensoren (52,54) aufweisen, die ausgangsseitig mit Signaleingängen der Zentralsteuerung (56) verbunden sind. Device according to one of claims 1 to 6, characterized in that the drive cylinder (18,18 ') at least two on the passing drive piston (20,20') responsive Zylinderschaltsensoren (52,54) on the output side with signal inputs of the central control (56 ) are connected. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Antriebsmechanismus (24) der Rohrweiche (22) mindestens einen auf die Position, die Geschwindigkeit oder die Endlagen der Rohrweiche (22) ansprechenden Rohrweichensensor (74) aufweist, der ausgangsseitig mit einem weiteren Signaleingang der Zentralsteuerung (56) verbunden ist. Device according to one of claims 1 to 7, characterized in that the drive mechanism (24) of the pipe switch (22) at least one on the position, the speed or the end positions of the pipe switch (22) responsive pipe sensor (74), the output side with a another signal input of the central controller (56) is connected. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Umsteuerventile (40,48) als Wegeventile mit elektromagnetischen Vorsteuerorganen (76,78) ausgebildet sind, deren Vorsteuerorgane (76,78) mit jeweils einem Steuerausgang (76', 78') der Zentralsteuerung (56) verbunden sind. Device according to one of claims 1 to 8, characterized in that the reversing valves (40,48) are designed as directional control valves with electromagnetic pilot elements (76,78) whose pilot control elements (76,78) each having a control output (76 ', 78' ) of the central controller (56) are connected.
EP13732483.6A 2012-09-13 2013-06-27 Device for the drive control of a two-cylinder thick matter pump Active EP2895743B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012216242.9A DE102012216242A1 (en) 2012-09-13 2012-09-13 Device for drive control of a two-cylinder slurry pump
PCT/EP2013/063530 WO2014040769A1 (en) 2012-09-13 2013-06-27 Device for the drive control of a two-cylinder thick matter pump

Publications (2)

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EP2895743A1 true EP2895743A1 (en) 2015-07-22
EP2895743B1 EP2895743B1 (en) 2016-10-05

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US (1) US20150211503A1 (en)
EP (1) EP2895743B1 (en)
JP (1) JP6194360B2 (en)
KR (1) KR102020700B1 (en)
CN (1) CN104541054B (en)
BR (1) BR112015004524A2 (en)
DE (1) DE102012216242A1 (en)
WO (1) WO2014040769A1 (en)

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WO2014040769A1 (en) 2014-03-20
DE102012216242A1 (en) 2014-03-13
CN104541054B (en) 2016-11-09
EP2895743B1 (en) 2016-10-05
KR102020700B1 (en) 2019-09-10
JP2015528541A (en) 2015-09-28
KR20150054805A (en) 2015-05-20
CN104541054A (en) 2015-04-22
JP6194360B2 (en) 2017-09-06
BR112015004524A2 (en) 2017-07-04
US20150211503A1 (en) 2015-07-30

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