EP4088027B1 - Method for operating a high-density solids pump and high-density solids pump - Google Patents

Description

FIELD OF APPLICATION AND STATE OF TECHNOLOGY

The invention relates to a method for operating a thick matter pump and a thick matter pump.

The DE 195 42 258 A1 discloses a sequence control for two-cylinder thick matter pumps, the delivery cylinders of which are actuated hydraulically via two drive cylinders in push-pull, with a pipe switch being arranged within a material feed container, which is alternately connected to the openings of the delivery cylinders on the inlet side and is connected to a delivery line on the outlet side. The drive cylinders are hydraulically connected to each other at one end to form a closed hydraulic circuit with a connection to a reversing pump and at the other end via a rocking oil line. To reverse the diverter pipe, pressure oil is diverted directly from the hydraulic lines leading from the reversing pump to the drive cylinders. In order to ensure a smooth reversal of the pipe switch without a malfunction in the delivery operation, it is proposed that the reversing pump is swung through with flow reversal and reversal of the pipe switch when the pistons of the drive cylinders reach their end position and that the rocking oil line is at least temporarily shut off while the reversing pump is pivoted .

TASK AND SOLUTION

The object of the invention is to provide a method for operating a thick matter pump and a thick matter pump, each of which has improved properties.

The invention solves this problem by providing a method with the features of claim 1 and a thick matter pump with the features of claim 15. Advantageous developments and / or refinements of the invention are described in the dependent claims.

The inventive, in particular automatic, method is designed or configured for, in particular automatic, operation of a thick matter pump. The thick matter pump includes or has a thick matter conveying system and a hydraulic drive system. The thick matter conveying system is designed to convey thick matter with a variably adjustable Delivery volume flow, in particular delivery volume flow value, designed or configured. For driving the thick matter conveying system, the hydraulic drive system comprises or has a, in particular common, hydraulic circuit having or comprising a hydraulic fluid, a variably operable first drive pump and a variably operable second drive pump. The first drive pump is for variable operation with at least one variably adjustable first pump parameter, in particular pump parameter value, and the second drive pump is for variable operation independent of the first pump parameter with at least one variably adjustable second pump parameter, pump parameter value, for, in particular directly, generating a variably adjustable Total drive volume flow, in particular total drive volume flow value, or total drive volume flow of the hydraulic fluid is formed or configured in the, in particular the same, hydraulic circuit. The method comprises or has the steps: determining, in particular automatically determining, a total drive volume flow setpoint for the total drive volume flow. Determining, in particular automatically determining, a first Parameter setpoint for the first pump parameter and a second parameter setpoint for the second pump parameter depending on, in particular at least, the determined total drive volume flow setpoint. The first parameter setpoint and the second parameter setpoint are different from one another if the determined total drive volume flow setpoint is in at least one total drive volume flow setpoint range from a set of possible total drive volume flow setpoints. Conveying the thick matter with the delivery volume flow with a delivery volume flow setpoint by generating the total drive volume flow with the determined total drive volume flow setpoint by, in particular automatically, setting the first pump parameter to the determined first parameter setpoint and the second pump parameter to the determined second parameter setpoint.

This makes it possible, in particular, for the first parameter setpoint and the second parameter setpoint to be different from each other to operate the thick matter pump more optimally, in particular in contrast to a method for operating a thick matter pump that is not according to the invention, wherein the first parameter setpoint and the second parameter setpoint are the same for all possible total drive volume flow setpoints.

In particular, the at least one total drive volume flow setpoint range with the first parameter setpoint and the second parameter setpoint can have or include at least one total drive volume flow setpoint that is different from one another. In particular, the at least one total drive volume flow setpoint range with the first parameter setpoint and the second parameter setpoint can be different from each other by a minimum of 20 percent (%), in particular a minimum of 30%, in particular a minimum of 40%, and/or a maximum of 100% of the set of possible total drive volume flow setpoints. Additionally or alternatively, the first parameter setpoint and the second parameter setpoint can be equal to one another if the determined total drive volume flow setpoint is in at least one other total drive volume flow setpoint range from the set of possible total drive volume flow setpoints. Additionally or alternatively, it is not necessary to determine whether or not the determined total drive volume flow setpoint is in the at least one total drive volume flow setpoint range from the set of possible total drive volume flow setpoints.

The first pump parameter or the first parameter setpoint and the second pump parameter or the second parameter setpoint can be comparable or similar or of the same type or the same unit, in particular a unit of measurement.

The values, in particular target values, can each be in a, in particular absolute, unit of measurement or a relative unit, in particular in %, in particular limited by a minimum value of 0% and a maximum value of 100%.

Variable setting can be referred to as adjustable or changeable and/or variable setting can be referred to as adjusting or changing and/or variably operable drive pump can be referred to as variable pump. Additionally or alternatively, variably adjustable to at least three different values, in particular continuously, can mean adjustable and/or variable setting can mean to one of at least three different values, in particular continuously. Furthermore, additionally or alternatively, when the overall drive volume flow setpoint changes, the first parameter setpoint and/or the second parameter setpoint can be changed or adjusted or set differently.

The total drive volume flow setpoint can be specified by a user or an operator of the thick matter pump.

The total drive volume flow of the hydraulic fluid can be generated in a drive pressure section, in particular a drive high pressure section, of the hydraulic circuit. Additionally or alternatively, the first drive pump and the second drive pump can be coupled to one another.

The hydraulic fluid can include, in particular be, oil.

The thick matter pump can be a building material pump. Additionally or alternatively, the thick matter conveying system can be designed to convey thick matter in the form of building material. Building material can refer to mortar, cement, screed, concrete and/or plaster. Additionally or alternatively, thick matter can refer to mud.

In a further development of the invention, the method comprises or has the step: determining, in particular automatically determining, in particular recording, the delivery volume flow setpoint for the delivery volume flow. The method comprises: determining the total drive volume flow setpoint depending on the determined delivery volume flow setpoint. In particular, the delivery volume flow setpoint can be specified by the user of the thick matter pump.

In a further development of the invention, the method comprises or has the step: detecting, in particular automatically detecting, an actual drive pressure value Drive pressure, in particular a high drive pressure, of the hydraulic fluid in the hydraulic circuit. The actual drive pressure value of the drive pressure is established as a function of an actual delivery pressure value of a delivery pressure of the thick material when conveying or during conveying. The method comprises: determining the first parameter setpoint and the second parameter setpoint depending on the recorded actual drive pressure value. This, in particular the determination of the first parameter setpoint and the second parameter setpoint as a function of the detected drive pressure actual value, enables the thick matter pump to be operated even more optimally, in particular in contrast to a method for operating a thick matter pump that is not according to the invention, wherein the first parameter setpoint and the second parameter setpoint are not included Dependence on an actual drive pressure value can be determined. In particular, the actual delivery pressure value can be adjusted depending on the consistency of the thick matter and/or a mast position of a distribution boom, if present, of the thick matter pump during delivery, in particular and can change during or during delivery. Additionally or alternatively, the hydraulic drive system, in particular the first drive pump and the second drive pump, can be designed or designed in such a way that the actual drive pressure value can be adjusted. Furthermore, additionally or alternatively, when the actual drive pressure value changes, the first parameter setpoint and/or the second parameter setpoint can be changed or adjusted or set differently. Further additionally or alternatively, the drive pressure can be in a drive pressure section, in particular the drive high pressure can be in a drive high pressure section, of the hydraulic circuit.

In a further development of the invention, the thick matter pump comprises or has at least, in particular only, one, in particular only, drive motor. The at least one drive motor is designed or configured to rotate the first drive pump and the second drive pump to generate the total drive volume flow. The method comprises: conveying the thick matter by rotating the first drive pump and the second drive pump using the at least one drive motor.

In a further development of the invention, the first drive pump is designed or configured for variable rotation with the first pump parameter in the form of a variably adjustable first pump speed and the second drive pump is designed or configured for variable rotation independent of the first pump speed with the second pump parameter in the form of a variably adjustable second pump speed . In particular, the first parameter setpoint in the form of a first pump speed setpoint and the second parameter setpoint in the form of a second pump speed setpoint are different from one another if the determined total drive volume flow setpoint is in the at least one Total drive volume flow setpoint range. Additionally or alternatively, the method comprises: conveying the thick matter by adjusting the first pump speed to the determined first pump speed setpoint and the second pump speed to the determined second pump speed setpoint. Further additionally or alternatively, the thick matter pump can have at least one variably adjustable gear, wherein the at least one variably adjustable gear can connect the, in particular single, drive motor to the first drive pump and / or the second drive pump for rotation. This can enable the first pump speed and the second pump speed to be independent of each other.

In one embodiment of the invention, the thick matter pump comprises or has a variably operable first drive motor and a second drive motor which can be variably operated independently of the first drive motor. The first drive motor is designed or configured for variably rotating the first drive pump and the second drive motor for variably rotating the second drive pump. This means that the thick matter pump does not need to have a variably adjustable gear. In particular, the first drive motor can be designed to variably adjust its first engine speed and/or the second drive motor can be designed to variably adjust its second engine speed, in particular independently of the first engine speed. Additionally or alternatively, the first drive motor need not be designed to variably rotate the second drive pump and/or the second drive motor does not need to be designed to variably rotate the first drive pump.

In one embodiment of the invention, the first drive motor and the second drive motor each comprise or have an electric drive motor. In particular, the first drive motor and the second drive motor are each an electric drive motor. In particular, the electric drive motor can be a synchronous motor, in particular with an associated frequency converter of the thick matter pump.

In one embodiment of the invention, the drive motor, in particular the only one, comprises or has an internal combustion drive motor. In particular, the drive motor, in particular the only one, is an internal combustion drive motor. In particular, the internal combustion drive engine can have, in particular be, a diesel drive engine.

In a further development of the invention, the first drive pump is in the form of a first axial piston pump having or comprising a variably adjustable first sliding disk or swash plate for variably adjusting the first pump parameter in the form of a first pivot angle of the first sliding disk and the second drive pump in the form of a second axial piston pump having or comprising a variably adjustable second sliding disk or swashplate for variable adjustment of the second pump parameter independent of the first pivoting angle in the form of a second pivoting angle of the second sliding disk. This allows the thick matter pump to only have a single drive motor and/or does not need to have a variably adjustable gearbox. In particular, the first drive pump and the second drive pump can be designed for, in particular variable, rotation with a fixed or non-variably adjustable pump speed ratio, in particular an equal, in particular variably adjustable, pump speed. Additionally or alternatively, the first parameter setpoint in the form of a first swivel angle setpoint and the second parameter setpoint in the form of a second swivel angle setpoint are different from one another if the determined total drive volume flow setpoint is in the at least one total drive volume flow setpoint range. Further additionally or alternatively, the method comprises: conveying the thick matter by adjusting the first pivoting angle to the determined first pivoting angle setpoint and the second pivoting angle to the determined second pivoting angle setpoint. Further additionally or alternatively, the method can comprise: determining the first parameter setpoint in the form of the first swivel angle setpoint and the second parameter setpoint in the form of the second swivel angle setpoint depending on a motor speed value, in particular an actual motor speed value, of the drive motor.

In one embodiment of the invention, the drive motor, in particular the only one, is designed or configured to variably adjust its motor speed. The method comprises or has the step: determining, in particular automatically determining, an engine speed setpoint for the engine speed as a function of the determined total drive volume flow setpoint, in particular and the recorded actual drive pressure value, if available. The method includes: conveying the thick matter by means of, in particular automatic, adjustment of the engine speed to the determined engine speed setpoint.

In an embodiment of the invention with increasing total drive volume flow setpoint in a low total drive volume flow setpoint range, a first swivel angle setpoint for the first swivel angle increases, in particular from a first swivel angle minimum value, in particular zero, to a first swivel angle maximum value and a second swivel angle setpoint for the second swivel angle is constant, in particular a second pivot angle minimum value, in particular zero, and in a higher total drive volume flow setpoint range, the second pivot angle setpoint increases, in particular from the second Swivel angle minimum value, in particular zero, up to a second swivel angle maximum value, in particular and if the first swivel angle setpoint is the first swivel angle maximum value and the second swivel angle setpoint is the second swivel angle maximum value, in an even higher total drive volume flow setpoint range, the engine speed setpoint increases from a motor speed minimum value, in particular greater than zero, to to a maximum engine speed value. This enables maximum efficiency of the hydraulic drive system. In particular, in the low total drive volume flow setpoint range and/or the higher total drive volume flow setpoint range, the engine speed setpoint can be constant, in particular the minimum engine speed value, in particular greater than zero. Additionally or alternatively, the first pivot angle minimum value and the second pivot angle minimum value can be the same and/or the first pivot angle maximum value and the second pivot angle maximum value can be the same. Further additionally or alternatively, the second axial piston pump can generate a same total drive volume flow value of the total drive volume flow at the second pivot angle maximum value as the first axial piston pump at the first pivot angle maximum value, in particular at the same pump speed.

In one embodiment of the invention, the second axial piston pump, in particular alone, generates a higher total drive volume flow value of the total drive volume flow at a second pivot angle maximum value of the second pivot angle than the first axial piston pump, in particular alone, at a first pivot angle maximum value of the first pivot angle, in particular at the same pump speed. With increasing total drive volume flow setpoint in a low total drive volume flow setpoint range, a first swivel angle setpoint for the first swivel angle is higher than a second swivel angle setpoint for the second swivel angle up to the first swivel angle maximum value, in a higher total drive volume flow setpoint range, the second swivel angle setpoint is higher than the first swivel angle setpoint up to second swivel angle maximum value, in particular and if the first swivel angle setpoint is the first swivel angle maximum value and the second swivel angle setpoint is the second swivel angle maximum value, in an even higher total drive volume flow setpoint range, the engine speed setpoint increases from a minimum engine speed value to a maximum engine speed value. This enables maximum efficiency of the hydraulic drive system. In other words: the second axial piston pump can have or have a higher maximum displacement volume than the first axial piston pump. In particular, in the low total drive volume flow setpoint range and/or the higher Total drive volume flow setpoint range of the engine speed setpoint constant, in particular the engine speed minimum value, in particular greater than zero. Additionally or alternatively, the first pivot angle maximum value and the second pivot angle maximum value can be the same.

In a further development, in particular an embodiment of the invention, the method has: determining the first parameter setpoint and the second parameter setpoint, in particular and the engine speed setpoint, if present, based on an optimization criterion. The optimization criterion is a maximum efficiency of the thick matter pump, in particular a maximum efficiency of the hydraulic drive system, in particular a maximum efficiency of the first drive pump and/or a maximum efficiency of the second drive pump, or a minimum energy consumption, in particular a minimum fuel consumption, and/or a maximum efficiency of the at least one drive motor. In particular, the optimization criterion can be specified by the user of the thick matter pump.

In a further development of the invention, the first drive pump and the second drive pump are arranged in parallel in the hydraulic circuit. Additionally or alternatively, the hydraulic drive system includes or has, in particular at least, a variably movable drive piston in the hydraulic circuit for driving the thick matter conveying system. The first drive pump and the second drive pump are designed or configured to generate the variably adjustable total drive volume flow of the hydraulic fluid in the hydraulic circuit for variable movement of the, in particular at least one, drive piston. The method includes: conveying the thick matter by variable movement of the drive piston. In particular, the first parameter setpoint and the second parameter setpoint can be different from one another at or during a stroke, in particular at least 50% percent of a length and/or a duration of the stroke, in particular and not only when a direction of movement of the drive piston changes.

The thick matter pump according to the invention has a, in particular, a thick matter conveying system, a, in particular, a hydraulic drive system and an, in particular electrical, detection device. The thick matter conveying system is designed to convey thick matter, in particular the thick matter, with a, in particular, variably adjustable delivery volume flow. For driving the thick material conveying system, the hydraulic drive system has a hydraulic circuit, in particular the hydraulic fluid, a, in particular the, variably operable first drive pump and a, in particular the, variably operable second drive pump. These are the first Drive pump for variable operation with at least one, in particular the at least one, variably adjustable first pump parameter and the second drive pump for variable operation independent of the first pump parameter with at least one, in particular the at least one, variably adjustable second pump parameter for generating one, in particular the, variable adjustable total drive volume flow of the hydraulic fluid is formed in the hydraulic circuit. The determination device is designed or configured for, in particular automatically, determining a, in particular the, total drive volume flow setpoint for the total drive volume flow. Furthermore, the determination device is designed or configured for, in particular automatically, determining one, in particular the, first parameter setpoint for the first pump parameter and one, in particular the, second parameter setpoint for the second pump parameter as a function of the determined total drive volume flow setpoint. The first parameter setpoint and the second parameter setpoint are different from one another if the determined total drive volume flow setpoint is in at least one, in particular the at least one, total drive volume flow setpoint range from one, in particular the, set of possible total drive volume flow setpoints. The thick matter pump is designed to convey the thick matter with the delivery volume flow with a, in particular the, delivery volume flow setpoint by generating the total drive volume flow with the determined total drive volume flow setpoint by means of, in particular automatic, setting of the first pump parameter to the determined first parameter setpoint and of the second pump parameter to the determined second parameter setpoint or .configured.

The thick matter pump can provide the same advantages as the previously described method.

In particular, the thick matter pump can be designed or configured to carry out the method described above.

The determination device can have a processor and/or a memory.

BRIEF DESCRIPTION OF DRAWINGS

Fig. 1

einen schematischen Schaltplan einer erfindungsgemäßen Dickstoffpumpe aufweisend nur einen einzigen Antriebsmotor,

Fig. 2

einen schematischen Schaltplan eines Ausschnitts der erfindungsgemäßen Dickstoffpumpe aufweisend einen ersten Antriebsmotor und einen zweiten Antriebsmotor,

Fig. 3

ein Ablaufdiagramm eines erfindungsgemäßen Verfahrens zum Betreiben der erfindungsgemäßen Dickstoffpumpe mittels eines Look-up-tables,

Fig. 4

ein Ablaufdiagramm zum Ermitteln des Look-up-tables der Fig. 3,

Fig. 5

ein Ablaufdiagramm des erfindungsgemäßen Verfahrens zum Betreiben der erfindungsgemäßen Dickstoffpumpe mittels Online-Ermitteln,

Fig. 6

einen Graphen eines ersten Parametersollwerts in Form eines ersten Schwenkwinkelsollwerts, eines zweiten Parametersollwerts in Form eines zweiten Schwenkwinkelsollwerts und eines Motordrehzahlsollwerts über einem erhöhenden Gesamtantriebsvolumenstromsollwert des erfindungsgemäßen Verfahrens, und

Fig. 7

einen weiteren Graphen eines ersten Parametersollwerts in Form eines ersten Schwenkwinkelsollwerts, eines zweiten Parametersollwerts in Form eines zweiten Schwenkwinkelsollwerts und eines Motordrehzahlsollwerts über einem erhöhenden Gesamtantriebsvolumenstromsollwert des erfindungsgemäßen Verfahrens.

Further advantages and aspects of the invention result from the claims and from the following description of preferred exemplary embodiments of the invention, which are explained below with reference to the figures. Show:

Fig. 1

a schematic circuit diagram of a thick matter pump according to the invention having only a single drive motor,

Fig. 2

a schematic circuit diagram of a section of the thick matter pump according to the invention, having a first drive motor and a second drive motor,

Fig. 3

a flowchart of a method according to the invention for operating the thick matter pump according to the invention using a look-up table,

Fig. 4

a flowchart for determining the look-up table of the Fig. 3 ,

Fig. 5

a flow chart of the method according to the invention for operating the thick matter pump according to the invention by means of online determination,

Fig. 6

a graph of a first parameter setpoint in the form of a first swivel angle setpoint, a second parameter setpoint in the form of a second swivel angle setpoint and a motor speed setpoint over an increasing total drive volume flow setpoint of the method according to the invention, and

Fig. 7

a further graph of a first parameter setpoint in the form of a first swivel angle setpoint, a second parameter setpoint in the form of a second swivel angle setpoint and a motor speed setpoint over an increasing total drive volume flow setpoint of the method according to the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Fig. 1 and 2 show a thick matter pump 1 according to the invention. The thick matter pump 1 has a thick matter conveying system 2, a hydraulic drive system 3 and a detection device 50. The thick matter conveying system 2 is designed to convey thick matter DS with a variably adjustable delivery volume flow QF. To drive the thick matter conveying system 2, the hydraulic drive system 3 has a hydraulic circuit 4 having a hydraulic fluid HF, a variably operable first drive pump 5 and a variably operable second drive pump 7. The first drive pump 5 is for variable operation with at least one variably adjustable first pump parameter P5 and the second Drive pump 7 for variable operation independent of the first pump parameter P5 with at least one variably adjustable second pump parameter P7 for generating a variably adjustable total drive volume flow QA of the hydraulic fluid HF in the hydraulic circuit 4. The determination device 50 is designed to determine a total drive volume flow setpoint QAS for the total drive volume flow QA, as in Fig. 3 and 5 shown. Furthermore, the determination device 50 is designed to determine a first parameter setpoint P5S for the first pump parameter P5 and a second parameter setpoint P7S for the second pump parameter P7 depending on the determined total drive volume flow setpoint QAS. The first parameter setpoint P5S and the second parameter setpoint P7S are different from each other if the determined total drive volume flow setpoint QAS is in at least one total drive volume flow setpoint range QASB1, QASB2, QASB3, QASB1' from a set 0, QASB1, QASB2, QASB3, QASB4, QASB1', QASB2` ,QASB3` of possible total drive volume flow setpoints QAS is, as in Fig. 6 and 7 shown. The thick matter pump 1 is for conveying the thick matter DS with the delivery volume flow QF with a delivery volume flow setpoint QFS by generating the total drive volume flow QA with the determined total drive volume flow setpoint QAS by setting the first pump parameter P5 to the determined first parameter setpoint P5S and the second pump parameter P7 to the determined second parameter setpoint P7S educated.

Fig. 3 and 5 show a method according to the invention for operating the thick matter pump 1. The thick matter pump 1 has the thick matter conveying system 2 and the hydraulic drive system 3. The thick matter conveying system 2 is designed to convey the thick matter DS with the variably adjustable delivery volume flow QF. To drive the thick matter conveying system 2, the hydraulic drive system 3 has the hydraulic circuit 4 comprising the hydraulic fluid HF, the variably operable first drive pump 5 and the variably operable second drive pump 7. The first drive pump 5 is for variable operation with the at least one variably adjustable first pump parameter P5 and the second drive pump 7 is for variable operation independent of the first pump parameter P5 with the at least one variably adjustable second pump parameter P7 for generating the variably adjustable total drive volume flow QA of the hydraulic fluid HF formed in the hydraulic circuit 4. The method has the steps: Determining the total drive volume flow setpoint QAS for the total drive volume flow QA, in particular by means of the determination device 50. Determining the first parameter setpoint P5S for the first pump parameter P5 and the second parameter setpoint P7S for the second pump parameter P7 depending on the determined total drive volume flow setpoint QAS, in particular by means of the determination device 50.

The first parameter setpoint P5S and the second parameter setpoint P7S are different from each other if the determined total drive volume flow setpoint QAS is in the at least one total drive volume flow setpoint range QASB1, QASB2, QASB3, QASB1` from the set 0, QASB1, QASB2, QASB3, QASB4, QASB1', QASB2`, QASB3` of possible total drive volume flow setpoints QAS is. Conveying the thick matter DS with the delivery volume flow QF with the delivery volume flow setpoint QFS, in particular by means of the thick matter conveying system 2, in particular by driving the thick matter conveying system 2 by means of the hydraulic drive system 3, by generating the total drive volume flow QA with the determined total drive volume flow setpoint QAS by setting the first pump parameter P5 to the determined first Parameter setpoint P5S and the second pump parameter P7 to the determined second parameter setpoint P7S, in particular and by operating the first drive pump 5 and the second drive pump 7, in particular by means of the thick matter pump 1.

In the exemplary embodiment shown, the hydraulic drive system 3 only has the variably operable first drive pump 5 and the variably operable second drive pump 7. In alternative exemplary embodiments, the hydraulic drive system can have at least three, in particular at least four, variably operable drive pumps.

In detail, the first drive pump 5 and the second drive pump 7 are arranged in parallel in the hydraulic circuit 4.

In addition, the hydraulic drive system 3 has a variably movable drive piston 11a, 11b in the hydraulic circuit 4 for driving the thick matter conveying system 2. The first drive pump 5 and the second drive pump 7 are designed to generate the variably adjustable total drive volume flow QA of the hydraulic fluid HF in the hydraulic circuit 4 for variable movement of the drive piston 11a, 11b. The method comprises: conveying the thick matter DS by variable movement of the drive piston 11a, 11b.

In the exemplary embodiment shown, the hydraulic drive system 3 has exactly two variably movable drive pistons 11a, 11b. In alternative exemplary embodiments, the hydraulic drive system can have only a single variably movable drive piston or at least three, in particular at least four, variably movable drive pistons. In particular, the hydraulic drive system 3 has one, in the exemplary embodiment shown two, drive cylinders 10a, 10b. The drive piston 11a, 11b is arranged in the, in particular, assigned drive cylinder 10a, 10b.

Furthermore, the hydraulic circuit 4 has a rocking line 60.

The first drive pump 5 and the second drive pump 7 and the two drive cylinders 10a, 10b form a closed drive circuit for the hydraulic fluid HF by means of the rocking line 60.

In addition, the two drive pistons 11a, 11b are coupled by means of the rocking line 60, in particular in anti-phase.

Furthermore, the first drive pump 5 and the second drive pump 7 or the closed drive circuit have a high-pressure side and a low-pressure side, in particular which are cyclically exchanged with one another, in particular when or during the operation of the thick matter pump 1.

In addition, the thick matter conveying system 2 has, in particular at least, a delivery cylinder 12a, 12b and, in particular at least, a variably movable delivery piston 13a, 13b for conveying the thick matter DS with the variably adjustable delivery volume flow QF. The delivery piston 13a, 13b is arranged in the, in particular, assigned delivery cylinder 12a, 12b. The method comprises: conveying the thick matter DS by variable movement of the conveying piston 13a, 13b.

In particular, the thick matter pump 1 has, in particular, at least one piston rod 14a, 14b. The piston rod 14a, 14b is attached to the, in particular assigned, drive piston 11a, 11b for movement coupling with or transmission of movement to the, in particular assigned, delivery piston 13a, 13b.

Furthermore, the method has the step: Determining the delivery volume flow setpoint QFS for the delivery volume flow QF, in particular by means of the determination device 50. The method has: Determining the total drive volume flow setpoint QAS as a function of the determined delivery volume flow setpoint QFS.

In particular, the thick matter pump 1 has a user-operable control panel 51 for specifying, in particular selecting, the delivery volume flow setpoint QFS by a user of the thick matter pump 1.

The method also has the step: detecting an actual drive pressure value pAI of a drive pressure pA, in particular a drive high pressure pH, of the hydraulic fluid HF in the hydraulic circuit 4, in particular by means of a, in particular electrical, sensor 40 of the thick matter pump 1. The actual drive pressure value pAI of the drive pressure pA represents depending on a delivery pressure actual value pFI of a delivery pressure pF of the thick matter DS during delivery. The method comprises: determining the first parameter setpoint P5S and the second parameter setpoint P7S as a function of the recorded actual drive pressure value pAI.

The thick matter pump 1 also has at least one drive motor 9, 95, 97. The at least one drive motor 9, 95, 97 is designed to rotate the first drive pump 5 and the second drive pump 7 to generate the total drive volume flow QA. The method comprises: conveying the thick matter DS by rotating the first drive pump 5 and the second drive pump 7 by means of the at least one drive motor 9, 95, 97.

In addition, the first drive pump 5 is designed for variable rotation with the first pump parameter P5 in the form of a variably adjustable first pump speed n5 and the second drive pump 7 is designed for variable rotation independent of the first pump speed n5 with the second pump parameter P7 in the form of a variably adjustable second pump speed n7 , as in Fig. 2 shown.

In detail shows in Fig. 2 the thick matter pump 1 has a variably operable first drive motor 95 and a second drive motor 97 which can be variably operated independently of the first drive motor 95. The first drive motor 95 is designed to variably rotate the first drive pump 5 and the second drive motor 97 is designed to variably rotate the second drive pump 7.

In particular, the first drive motor 95 is designed to variably adjust its first engine speed n95 and the second drive motor 97 is designed to variably adjust its second engine speed n97.

Furthermore, the first drive motor 95 and the second drive motor 97 each have an electric drive motor 105, 107. In particular, the first drive motor 95 and the second drive motor 97 are each an electric drive motor 105, 107.

In Fig. 1 the thick matter pump 1 only has a single drive motor 9.

In detail shows in Fig. 1 the drive motor 9 has an internal combustion drive motor 10. In particular, the drive motor 9 is an internal combustion drive motor 10.

In addition, especially in Fig. 1 and 2 , the first drive pump 5 in the form of a first axial piston pump 5 'having a variably adjustable first sliding disk 6 for variably adjusting the first pump parameter P5 in the form of a first pivot angle W6 of the first sliding disk 6 and the second drive pump 7 in the form of a second axial piston pump 7' having a variably adjustable second sliding disk 8 for variable adjustment of the second pump parameter P7 independent of the first pivoting angle W6 in the form of a second pivoting angle W8 of the second sliding disk 8.

In particular, the hydraulic drive system 3 has at least one, in particular electrically adjustable, actuator. The at least one actuator is designed to variably adjust the first pivot angle W6 and the second pivot angle W8.

In detail, the drive motor 9, in particular the only one, is designed to variably adjust its motor speed n9. The method has the step: determining an engine speed setpoint n9S for the engine speed n9 as a function of the determined total drive volume flow setpoint QAS, in particular and the detected drive pressure actual value pAI, as in Fig. 3 and 5 to 7 shown, in particular by means of the determination device 50. The method comprises: conveying the thick matter DS by adjusting the engine speed n9 to the determined engine speed setpoint n9S, in particular by means of the thick matter pump 1.

Further, with increasing total drive volume flow setpoint QAS in a low total drive volume flow setpoint range QASB1, QASB1`, a first swivel angle setpoint W6S for the first swivel angle W6 increases, in particular from a first swivel angle minimum value W6min 0%, to a first swivel angle maximum value W6max, in particular 100%, and a second Swivel angle setpoint W8S for the second swivel angle W8 is constant, in particular a second swivel angle minimum value W8min 0%, as in Fig. 6 and 7 shown. As the total drive volume flow setpoint QAS increases in a higher total drive volume flow setpoint range QASB2, QASB2`, the second swivel angle setpoint W8S increases, in particular from the second swivel angle minimum value W8min 0%, in Fig. 6 to 80% and from 80% and in Fig. 7 up to 50% and from 50%, up to a second pivot angle maximum value W8max, in particular 100%.

In particular, and if the first swivel angle setpoint W6S is the first swivel angle maximum value W6max and the second swivel angle setpoint W8S is the second swivel angle maximum value W8max, with increasing total drive volume flow setpoint QAS in an even higher total drive volume flow setpoint range QASB4, QASB3`, the motor speed setpoint n9S increases from a motor speed minimum value n9min, in Fig. 6 70% and in Fig. 7 60%, up to a maximum engine speed value n9max, in particular 100%.

In addition, generated for the in Fig. 6 In the graph shown, the second axial piston pump 7 at the second pivot angle maximum value W8max of the second pivot angle W8 has a higher total drive volume flow value QAW of the total drive volume flow QA than the first axial piston pump 5 at the first pivot angle maximum value W6max of the first pivot angle W6. With increasing total drive volume flow setpoint QAS in the low total drive volume flow setpoint range QASB1, the first swivel angle setpoint W6S for the first swivel angle W6 is higher than the second swivel angle setpoint W8S for the second swivel angle W8 up to the first swivel angle maximum value W6max. With increasing total drive volume flow setpoint QAS in the higher total drive volume flow setpoint range QASB2, the second swivel angle setpoint W8S is higher than the first swivel angle setpoint W6S up to the second swivel angle maximum value W8max.

For the in Fig. 7 In the graph shown, the second axial piston pump 7 generates the same total drive volume flow value QAW at the second pivot angle maximum value W8max as the first axial piston pump 5 at the first pivot angle maximum value W6max.

In particular is in Fig. 6 the low total drive volume flow setpoint range QASB1 greater than 0% to 30% of a total drive volume flow maximum value QAmax. The higher total drive volume flow setpoint range QASB2 is greater than 30% to 40% of the total drive volume flow maximum value QAmax. The even higher total drive volume flow setpoint range QASB4 is greater than 70% to 100% of the total drive volume flow maximum value QAmax. In addition, a total drive volume flow setpoint range 0 is lower than the low total drive volume flow setpoint range QASB1 0% and a total drive volume flow setpoint range QASB3 is between the higher Total drive volume flow setpoint range QASB2 and the even higher total drive volume flow setpoint range QASB4 is greater than 40% to 70%.

In Fig. 7 the low total drive volume flow setpoint range QASB1` is greater than 0% to 40% of the total drive volume flow maximum value QAmax. The higher total drive volume flow setpoint range QASB2` is greater than 40% to 80% of the total drive volume flow maximum value QAmax. The even higher total drive volume flow setpoint range QASB3` is greater than 80% to 100% of the total drive volume flow maximum value QAmax. In addition, a total drive volume flow setpoint range 0 is lower than the low total drive volume flow setpoint range QASB1 0%.

Furthermore, as the total drive volume flow setpoint QAS increases in the higher total drive volume flow setpoint range QASB2, the first swivel angle setpoint W6S is constant, in particular the first swivel angle minimum value W6min 0%, as in Fig. 6 shown.

In addition, with increasing total drive volume flow setpoint QAS in the total drive volume flow setpoint range QASB3, the first swivel angle setpoint W6S increases, in particular from the first swivel angle minimum value W6min 0%, in particular to 70% and from 70%, up to the first swivel angle maximum value W6max.

Further, as the total drive volume flow setpoint QAS increases in the total drive volume flow setpoint range QASB3, the second swivel angle setpoint W8S increases, in particular from 50%, up to the second swivel angle maximum value W8max.

In addition, with increasing total drive volume flow setpoint QAS in the higher total drive volume flow setpoint range QASB2`, the first swivel angle setpoint W6S increases, in particular from 50%, up to the first swivel angle maximum value W6max, as in Fig. 7 shown.

Thus, the first parameter setpoint P5S and the second parameter setpoint P7S are different from each other if the determined total drive volume flow setpoint QAS is in the low total drive volume flow setpoint range QASB1, QASB1` and the higher total drive volume flow setpoint range QASB2, in particular and the total drive volume flow setpoint range QASB3.

In addition, the first parameter setpoint P5S and the second parameter setpoint P7S are equal to one another if the determined total drive volume flow setpoint is in the total drive volume flow setpoint range 0, the higher total drive volume flow setpoint range QASB2` and the even higher total drive volume flow setpoint range QASB4, QASB3`.

Furthermore, in the total drive volume flow setpoint range 0, the low total drive volume flow setpoint range QASB1, QASB1', the higher total drive volume flow setpoint range QASB2, QASB2' and the total drive volume flow setpoint range QASB3, the engine speed setpoint n9S is constant, in particular the engine speed minimum value n9min.

The method also includes: determining the first parameter setpoint P5S and the second parameter setpoint P7S, in particular and the engine speed setpoint n9S, based on an optimization criterion OK, as in Fig. 3 to 5 shown. The optimization criterion OK is a maximum efficiency η1max of the thick matter pump 1, in particular a maximum efficiency η2max of the hydraulic drive system 2, in particular a maximum efficiency η5max of the first drive pump 5 and/or a maximum efficiency η7max of the second drive pump 7, or a minimum energy consumption EV9, in particular a minimum fuel consumption KV9, and/or a maximum efficiency η9max of the at least one drive motor 9, 95, 97.

In particular, the user-operable control panel 51 is designed to specify, in particular select, the optimization criterion OK for the user of the thick matter pump 1.

In Fig. 3 The first parameter setpoint P5S and the second parameter setpoint P7S, in particular and the engine speed setpoint n9S, are determined using a look-up table or offline.

In detail, the look-up table is determined by means of maps, in particular efficiency maps, of the first drive pump 5 and the second drive pump 7, in particular and of the at least one drive motor 9, 95, 97, for the possible total drive volume flow setpoints QAS, in particular and possible drive pressure actual values pAI , especially calculated, as in Fig. 4 shown.

In Fig. 5 The first parameter setpoint P5S and the second parameter setpoint P7S, in particular and the engine speed setpoint n9S, are determined by means of, in particular, the characteristic maps of first drive pump 5 and the second drive pump 7, in particular and the at least one drive motor 9, 95, 97, determined online, in particular calculated.

Furthermore, the determination device 50 has a, in particular electrical, signal connection with the first drive pump 5 and the second drive pump 7, in particular by means of the at least one actuator, in particular and the control panel 51, the sensor 40, and the at least one drive motor 9, 95, 97 on.

As the exemplary embodiments shown and explained above make clear, the invention provides an advantageous method for operating a slurry pump and an advantageous slurry pump, each of which has improved properties

Claims (15)

1. Method for operating a thick-matter pump (1),

   - wherein the thick-matter pump (1) has:

   - a thick-matter delivery system (2), wherein the thick-matter delivery system (2) is designed for delivering thick matter (DS) with a variably settable delivery volumetric flow rate (QF), and

   - a hydraulic drive system (3), wherein, for driving the thick-matter delivery system (2), the hydraulic drive system (3) has:

   - a hydraulic circuit (4) having a hydraulic fluid (HF),

   - a variably operable first drive pump (5), and

   - a variably operable second drive pump (7),

   - wherein the first drive pump (5) is designed for variable operation with at least one variably settable first pump parameter (P5) and the second drive pump (7) is designed for variable operation, independent of the first pump parameter (P5), with at least one variably settable second pump parameter (P7) for generating a variably settable overall drive volumetric flow rate (QA) of the hydraulic fluid (HF) in the hydraulic circuit (4),

   - wherein the method comprises the steps of:
   determining an overall-drive-volumetric-flow-rate target value (QAS) for the overall drive volumetric flow rate (QA),

   - determining a first parameter target value (P5S) for the first pump parameter (P5) and a second parameter target value (P7S) for the second pump parameter (P7) in a manner dependent on the determined overall-drive-volumetric-flow-rate target value (QAS), wherein the first parameter target value (P5S) and the second parameter target value (P7S) differ from one another if the determined overall-drive-volumetric-flow-rate target value (QAS) is in at least one overall-drive-volumetric-flow-rate-target-value range (QASB1, QASB2, QASB3, QASB1') from a set (0, QASB1, QASB2, QASB3, QASB4, QASB1', QASB2`, QASB3') of possible overall-drive-volumetric-flow-rate target values (QAS), and

   - delivering the thick matter (DS) with the delivery volumetric flow rate (QF) with a delivery-volumetric-flow-rate target value (QFS) by means of generating the overall drive volumetric flow rate (QA) with the determined overall-drive-volumetric-flow-rate target value (QAS) by means of setting the first pump parameter (P5) to the determined first parameter target value (P5S) and the second pump parameter (P7) to the determined second parameter target value (P7S).
2. Method according to Claim 1,

   - wherein the method comprises the step of: determining, in particular detecting, the deliveryvolumetric-flow-rate target value (QFS) for the delivery volumetric flow rate (QF), and

   - wherein the method comprises: determining the overall-drive-volumetric-flow-rate target value (QAS) in a manner dependent on the determined delivery-volumetric-flow-rate target value (QFS).
3. Method according to either of the preceding claims,

   - wherein the method comprises the step of: detecting a drive-pressure actual value (pAI) of a drive pressure (pA), in particular of a drive high pressure (pH), of the hydraulic fluid (HF) in the hydraulic circuit (4), wherein the drive-pressure actual value (pAI) of the drive pressure (pA) is established in a manner dependent on a delivery-pressure actual value (pFI) of a delivery pressure (pF) of the thick matter (DS) at the time of delivery, and

   - wherein the method comprises: determining the first parameter target value (P5S) and the second parameter target value (P7S) in a manner dependent on the detected drive-pressure actual value (pAI).
4. Method according to one of the preceding claims,

   - wherein the thick-matter pump (1) has at least one drive motor (9, 95, 97), wherein the at least one drive motor (9, 95, 97) is designed for rotating the first drive pump (5) and the second drive pump (7) for generating the overall drive volumetric flow rate (QA), and

   - wherein the method comprises: delivering the thick matter (DS) by means of rotating the first drive pump (5) and the second drive pump (7) by means of the at least one drive motor (9, 95, 97).
5. Method according to one of the preceding claims,

   - wherein the first drive pump (5) is designed for variable rotation with the first pump parameter (P5), in the form of a variably settable first pump rotational speed (n5), and the second drive pump (7) is designed for variable rotation, independent of the first pump rotational speed (n5), with the second pump parameter (P7), in the form of a variably settable second pump rotational speed (n7).
6. Method according to Claims 4 and 5,

   - wherein the thick-matter pump (1) has a variably operable first drive motor (95) and a second drive motor (97) which can be operated variably independently of the first drive motor (95), wherein the first drive motor (95) is designed for variably rotating the first drive pump (5), and the second drive motor (97) is designed for variably rotating the second drive pump (7).
7. Method according to Claim 6,

   - wherein the first drive motor (95) and the second drive motor (97) each have an electric drive motor (105, 107), in particular are each an electric drive motor (105, 107).
8. Method according to Claim 4 or a claim dependent on Claim 4,

   - wherein the, in particular single, drive motor (9) has a combustion drive motor (10), in particular is a combustion drive motor (10).
9. Method according to one of the preceding claims,

   - wherein the first drive pump (5), in the form of a first axial piston pump (5') having a variably settable first sliding disk (6), is designed for variably setting the first pump parameter (P5), in the form of a first pivot angle (W6) of the first sliding disk (6), and the second drive pump (7), in the form of a second axial piston pump (7') having a variably settable second sliding disk (8), is designed for variably setting, independently of the first pivot angle (W6), the second pump parameter (P7), in the form of a second pivot angle (W8) of the second sliding disk (8).
10. Method according to Claims 4 and 9, in particular and according to Claim 3,

    - wherein the, in particular single, drive motor (9) is designed for variably setting its motor rotational speed (n9),

    - wherein the method comprises the step of: determining a motor-rotational-speed target value (n9S) for the motor rotational speed (n9) in a manner dependent on the determined overall-drive-volumetric-flow-rate target value (QAS), in particular and on the detected drive-pressure actual value (pAI), and

    - wherein the method comprises: delivering the thick matter (DS) by means of setting the motor rotational speed (n9) to the determined motor-rotational-speed target value (n9S).
11. Method according to Claim 9 or 10,

    - wherein, with increasing overall-drive-volumetric-flow-rate target value (QAS) in a low overall-drive-volumetric-flow-rate-target-value range (QASB1, QASB1'), a first pivot-angle target value (W6S) for the first pivot angle (W6) increases up to a first pivot-angle maximum value (W6max) and a second pivot-angle target value (W8S) for the second pivot angle (W8) is constant, and in a higher overall-drive-volumetric-flow-rate-target-value range (QASB2, QASB2'), the second pivot-angle target value (W8S) increases up to a second pivot-angle maximum value (W8max), in particular and if the first pivot-angle target value (W6S) is the first pivot-angle maximum value (W6max) and the second pivot-angle target value (W8S) is the second pivot-angle maximum value (W8max), in an even higher overall-drive-volumetric-flow-rate-target-value range (QASB4, QASB3`), the motor-rotational-speed target value (n9S) increases from a motor-rotational-speed minimum value (n9min) up to a motor-rotational-speed maximum value (n9max).
12. Method according to one of Claims 9 to 11,

    - wherein the second axial piston pump (7) generates at a second pivot-angle maximum value (W8max) of the second pivot angle (W8) an overall-drive-volumetric-flow-rate value (QAW) of the overall drive volumetric flow rate (QA) that is greater than that which the first axial piston pump (5) generates at a first pivot-angle maximum value (W6max) of the first pivot angle (W6), and

    - wherein, with increasing overall-drive-volumetric-flow-rate target value (QAS) in a low overall-drive-volumetric-flow-rate-target-value range (QASB1), a first pivot-angle target value (W6S) for the first pivot angle (W6) is greater than a second pivot-angle target value (W8S) for the second pivot angle (W8) up to the first pivot-angle maximum value (W6max), in a higher overall-drive-volumetric-flow-rate-target-value range (QASB2), the second pivot-angle target value (W8S) is greater than the first pivot-angle target value (W6S) up to the second pivot-angle maximum value (W8max), in particular and if the first pivot-angle target value (W6S) is the first pivot-angle maximum value (W6max) and the second pivot-angle target value (W8S) is the second pivot-angle maximum value (W8max), in an even higher overall-drive-volumetric-flow-rate-target-value range (QASB4), the motor-rotational-speed target value (n9S) increases from a motor-rotational-speed minimum value (n9min) up to a motor-rotational-speed maximum value (n9max).
13. Method according to one of the preceding claims, in particular according to Claim 4 or a claim dependent on Claim 4, in particular according to Claim 10,

    - wherein the method comprises: determining the first parameter target value (P5S) and the second parameter target value (P7S), in particular and the motor-rotational-speed target value (n9S), on the basis of an optimization criterion (OK), wherein the optimization criterion (OK) is a maximum efficiency (η1max) of the thick-matter pump (1), in particular a maximum efficiency (η2max) of the hydraulic drive system (2) or a minimum energy consumption (EV9), in particular a minimum fuel consumption (KV9), and/or a maximum efficiency (n9max) of the at least one drive motor (9, 95, 97).
14. Method according to one of the preceding claims,

    - wherein the first drive pump (5) and the second drive pump (7) are arranged in parallel in the hydraulic circuit (4), and/or

    - wherein the hydraulic drive system (3) has a variably movable drive piston (11a, 11b) in the hydraulic circuit (4) for driving the thick-matter delivery system (2),

    - wherein the first drive pump (5) and the second drive pump (7) are designed for generating the variably settable overall drive volumetric flow rate (QA) of the hydraulic fluid (HF) in the hydraulic circuit (4) for variably moving the drive piston (11a, 11b), and

    - wherein the method comprises: delivering the thick matter (DS) by means of variably moving the drive piston (11a, 11b).
15. Thick-matter pump (1), wherein the thick-matter pump (1) has:

    - a thick-matter delivery system (2), wherein the thick-matter delivery system (2) is designed for delivering thick matter (DS) with a variably settable delivery volumetric flow rate (QF),

    - a hydraulic drive system (3), wherein, for driving the thick-matter delivery system (2), the hydraulic drive system (3) has:

    - a hydraulic circuit (4) having a hydraulic fluid (HF),

    - a variably operable first drive pump (5), and

    - a variably operable second drive pump (7),

    - wherein the first drive pump (5) is designed for variable operation with at least one variably settable first pump parameter (P5) and the second drive pump (7) is designed for variable operation, independent of the first pump parameter (P5), with at least one variably settable second pump parameter (P7) for generating a variably settable overall drive volumetric flow rate (QA) of the hydraulic fluid (HF) in the hydraulic circuit (4), and

    - a determination device (50), wherein the determination device (50)

    - is designed for determining an overall-drive-volumetric-flow-rate target value (QAS) for the overall drive volumetric flow rate (QA), and

    - is designed for determining a first parameter target value (P5S) for the first pump parameter (P5) and a second parameter target value (P7S) for the second pump parameter (P7) in a manner dependent on the determined overall-drive-volumetric-flow-rate target value (QAS), wherein the first parameter target value (P5S) and the second parameter target value (P7S) differ from one another if the determined overall-drive-volumetric-flow-rate target value (QAS) is in at least one overall-drive-volumetric-flow-rate-target-value range (QASB1, QASB2, QASB3, QASB1') from a set (0, QASB1, QASB2, QASB3, QASB4, QASB1', QASB2`, QASB3') of possible overall-drive-volumetric-flow-rate target values (QAS), and

    - wherein the thick-matter pump (1) is designed for delivering the thick matter (DS) with the delivery volumetric flow rate (QF) with a delivery-volumetric-flow-rate target value (QFS) by means of generating the overall drive volumetric flow rate (QA) with the determined overall-drive-volumetric-flow-rate target value (QAS) by means of setting the first pump parameter (P5) to the determined first parameter target value (P5S) and the second pump parameter (P7) to the determined second parameter target value (P7S).

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