Method for Operating a High-Density Solids Pump and High-Density Solids Pump

Abstract

A method operates a thick-matter pump having a thick-matter delivery system and a hydraulic drive system. The thick-matter delivery system delivers thick matter with a variably settable delivery volumetric flow rate for driving the thick-matter delivery system. The hydraulic drive system has: a hydraulic circuit having a hydraulic fluid, a variably operable first drive pump, and a variably operable second drive pump. The first drive pump is designed for variable operation with at least one variably settable first pump parameter and the second drive pump is designed for variable operation, independent of the first pump parameter, with at least one variably settable second pump parameter for generating a variably settable overall drive volumetric flow rate of the hydraulic fluid in the hydraulic circuit. The method determines an overall-drive-volumetric-flow-rate target value for the overall drive volumetric flow rate, and determines a first parameter target value for the first pump parameter and a second parameter target value for the second pump parameter in a manner dependent on the determined overall-drive-volumetric-flow-rate target value. The first and second parameter target values differ from one another if the determined overall-drive-volumetric-flow-rate target value is in at least one overall-drive-volumetric-flow-rate-target-value range from a set of possible overall-drive-volumetric-flow-rate target values. The method delivers the thick matter with the delivery volumetric flow rate at a delivery-volumetric-flow-rate target value by generating the overall drive volumetric flow rate with the determined overall-drive-volumetric-flow-rate target value by setting the first pump parameter to the determined first parameter target value and the second pump parameter to the determined second parameter target value.

1 .- 15 . (canceled) 
     
     
         16 . A method for operating a thick-matter pump,
 wherein the thick-matter pump comprises:   a thick-matter delivery system designed to deliver thick matter with a variably settable delivery volumetric flow rate, and   a hydraulic drive system, wherein, for driving the thick-matter delivery system, the hydraulic drive system has:
 a hydraulic circuit having a hydraulic fluid, 
 a variably operable first drive pump, and 
 a variably operable second drive pump, 
 wherein the first drive pump is designed for variable operation with at least one variably settable first pump parameter and the second drive pump is designed for variable operation, independent of the first pump parameter, with at least one variably settable second pump parameter for generating a variably settable overall drive volumetric flow rate of the hydraulic fluid in the hydraulic circuit, 
   the method comprising 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 (P 5 S) for the first pump parameter (P 5 ) and a second parameter target value (P 7 S) for the second pump parameter (P 7 ) in a manner dependent on the determined overall-drive-volumetric-flow-rate target value (QAS), wherein the first parameter target value (P 5 S) and the second parameter target value (P 7 S) differ from one another when the determined overall-drive-volumetric-flow-rate target value (QAS) is in at least one overall-drive-volumetric-flow-rate-target-value range (QASB 1 , QASB 2 , QASB 3 , QASB 1 ′) from a set ( 0 , QASB 1 , QASB 2 , QASB 3 , QASB 4 , QASB 1 ′, QASB 2 ′, QASB 3 ′) of possible overall-drive-volumetric-flow-rate target values (QAS), and   delivering the thick matter (DS) with the delivery volumetric flow rate (QF) at a delivery-volumetric-flow-rate target value (QFS) by way of generating the overall drive volumetric flow rate (QA) with the determined overall-drive-volumetric-flow-rate target value (QAS) by setting the first pump parameter (P 5 ) to the determined first parameter target value (P 5 S) and the second pump parameter (P 7 ) to the determined second parameter target value (P 7 S).   
     
     
         17 . The method as claimed in  claim 16 , further comprising the steps of:
 determining the delivery-volumetric-flow-rate target value (QFS) for the delivery volumetric flow rate (QF), and   determining the overall-drive-volumetric-flow-rate target value (QAS) in a manner dependent on the determined delivery-volumetric-flow-rate target value (QFS).   
     
     
         18 . The method as claimed in  claim 16 , further comprising the steps of:
 detecting a drive-pressure actual value (pAI) of a drive pressure (pA), of the hydraulic fluid (HF) in the hydraulic circuit, 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 at the time of delivery, and   determining the first parameter target value (P 5 S) and the second parameter target value (P 7 S) in a manner dependent on the detected drive-pressure actual value (pAI).   
     
     
         19 . The method as claimed in  claim 16 ,
 wherein the thick-matter pump has at least one drive motor, wherein the at least one drive motor is designed for rotating the first drive pump and the second drive pump for generating the overall drive volumetric flow rate, and   the method further comprising the step of:   delivering the thick matter by rotating the first drive pump and the second drive pump via the at least one drive motor.   
     
     
         20 . The method as claimed in  claim 16 ,
 wherein the first drive pump is designed for variable rotation with the first pump parameter (P 5 ), in the form of a variably settable first pump rotational speed (n 5 ), and the second drive pump is designed for variable rotation, independent of the first pump rotational speed (n 5 ), with the second pump parameter (P 7 ), in the form of a variably settable second pump rotational speed (n 7 ).   
     
     
         21 . The method as claimed in  claim 19 ,
 wherein the thick-matter pump has a variably operable first drive motor, and a second drive motor which is operatable variably independently of the first drive motor,   wherein the first drive motor is designed for variably rotating the first drive pump, and the second drive motor is designed for variably rotating the second drive pump.   
     
     
         22 . The method as claimed in  claim 21 ,
 wherein the first drive motor and the second drive motor are electric drive motors.   
     
     
         23 . The method as claimed in  claim 19 ,
 wherein the at least one drive motor is a combustion drive motor.   
     
     
         24 . The method as claimed in  claim 16 ,
 wherein the first drive pump, in the form of a first axial piston pump having a variably settable first sliding disk, is designed for variably setting the first pump parameter, in the form of a first pivot angle of the first sliding disk, and   wherein the second drive pump, in the form of a second axial piston pump having a variably settable second sliding disk, is designed for variably setting, independently of the first pivot angle, the second pump parameter, in the form of a second pivot angle of the second sliding disk.   
     
     
         25 . The method as claimed in  claim 19 ,
 wherein the at least one drive motor is designed for variably setting its motor rotational speed,   the method further comprising the steps of:   determining a motor-rotational-speed target value (n 9 S) for the motor rotational speed (n 9 ) in a manner dependent on the determined overall-drive-volumetric-flow-rate target value (QAS), and   delivering the thick matter by way of setting the motor rotational speed (n 9 ) to the determined motor-rotational-speed target value (n 9 S).   
     
     
         26 . The method as claimed in  claim 18 ,
 wherein the at least one drive motor is designed for variably setting its motor rotational speed (n 9 ),   the method further comprising the steps of: determining a motor-rotational-speed target value (n 9 S) for the motor rotational speed (n 9 ) in a manner dependent on the determined overall-drive-volumetric-flow-rate target value (QAS) and on the detected drive-pressure actual value (pAI), and   delivering the thick matter (DS) by way of setting the motor rotational speed (n 9 ) to the determined motor-rotational-speed target value (n 9 S).   
     
     
         27 . The method as claimed in  claim 24 ,
 wherein, with increasing overall-drive-volumetric-flow-rate target value (QAS) in a low overall-drive-volumetric-flow-rate-target-value range (QASB 1 , QASB 1 ′), a first pivot-angle target value (W 6 S) for the first pivot angle (W 6 ) increases up to a first pivot-angle maximum value (W 6 max) and a second pivot-angle target value (W 8 S) for the second pivot angle (W 8 ) is constant, and in a higher overall-drive-volumetric-flow-rate-target-value range (QASB 2 , QASB 2 ′), the second pivot-angle target value (W 8 S) increases up to a second pivot-angle maximum value (W 8 max), and if the first pivot-angle target value (W 6 S) is the first pivot-angle maximum value (W 6 max) and the second pivot-angle target value (W 8 S) is the second pivot-angle maximum value (W 8 max), in an even higher overall-drive-volumetric-flow-rate-target-value range (QASB 4 , QASB 3 ′), the motor-rotational-speed target value (n 9 S) increases from a motor-rotational-speed minimum value (n9 min) up to a motor-rotational-speed maximum value (n 9 max).   
     
     
         28 . The method as claimed in  claim 24 ,
 wherein the second axial piston pump generates, at a second pivot-angle maximum value (W 8 max) of the second pivot angle (W 8 ), 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 generates at a first pivot-angle maximum value (W 6 max) of the first pivot angle (W 6 ), and   wherein, with increasing overall-drive-volumetric-flow-rate target value (QAS) in a low overall-drive-volumetric-flow-rate-target-value range (QASB 1 ), a first pivot-angle target value (W 6 S) for the first pivot angle (W 6 ) is greater than a second pivot-angle target value (W 8 S) for the second pivot angle (W 8 ) up to the first pivot-angle maximum value (W 6 max), in a higher overall-drive-volumetric-flow-rate-target-value range (QASB 2 ), the second pivot-angle target value (W 8 S) is greater than the first pivot-angle target value (W 6 S) up to the second pivot-angle maximum value (W 8 max), and if the first pivot-angle target value (W 6 S) is the first pivot-angle maximum value (W 6 max) and the second pivot-angle target value (W 8 S) is the second pivot-angle maximum value (W 8 max), in an even higher overall-drive-volumetric-flow-rate-target-value range (QASB 4 ), the motor-rotational-speed target value (n 9 S) increases from a motor-rotational-speed minimum value (n9 min) up to a motor-rotational-speed maximum value (n 9 max).   
     
     
         29 . The method as claimed in  claim 19 , further comprising the steps of:
 determining the first parameter target value (P 5 S) and the second parameter target value (P 7 S), on the basis of an optimization criterion (OK), wherein the optimization criterion (OK) is a maximum efficiency (q 1 max) of the thick-matter pump.   
     
     
         30 . The method as claimed in  claim 29 ,
 wherein the optimization criterion (OK) is a maximum efficiency (q 2 max) of the hydraulic drive system or a minimum energy consumption (EV 9 ), and/or a maximum efficiency (q 9 max) of the at least one drive motor.   
     
     
         31 . The method as claimed in  claim 16 ,
 wherein the first drive pump and the second drive pump are arranged in parallel in the hydraulic circuit, and/or   wherein the hydraulic drive system has a variably movable drive piston in the hydraulic circuit for driving the thick-matter delivery system,   wherein the first drive pump and the second drive pump are designed for generating the variably settable overall drive volumetric flow rate of the hydraulic fluid in the hydraulic circuit for variably moving the drive piston, and   the method further comprising the step of:
 delivering the thick matter by way of variably moving the drive piston. 
   
     
     
         32 . A thick-matter pump, comprising:
 a thick-matter delivery system, wherein the thick-matter delivery system is designed for delivering thick matter with a variably settable delivery volumetric flow rate; and   a hydraulic drive system, wherein, for driving the thick-matter delivery system, the hydraulic drive system comprises:
 a hydraulic circuit having a hydraulic fluid, 
 a variably operable first drive pump, and 
 a variably operable second drive pump, 
 wherein the first drive pump is designed for variable operation with at least one variably settable first pump parameter (P 5 ) and the second drive pump is designed for variable operation, independent of the first pump parameter (P 5 ), with at least one variably settable second pump parameter (P 7 ) for generating a variably settable overall drive volumetric flow rate (QA) of the hydraulic fluid in the hydraulic circuit; and 
   a determination device, wherein the determination device is configured to:
 determine an overall-drive-volumetric-flow-rate target value (QAS) for the overall drive volumetric flow rate (QA), and 
 determine a first parameter target value (P 5 S) for the first pump parameter (P 5 ) and a second parameter target value (P 7 S) for the second pump parameter (P 7 ) in a manner dependent on the determined overall-drive-volumetric-flow-rate target value (QAS), wherein the first parameter target value (P 5 S) and the second parameter target value (P 7 S) 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 (QASB 1 , QASB 2 , QASB 3 , QASB 1 ′) from a set ( 0 , QASB 1 , QASB 2 , QASB 3 , QASB 4 , QASB 1 ′, QASB 2 ′, QASB 3 ′) of possible overall-drive-volumetric-flow-rate target values (QAS), and 
   wherein the thick-matter pump is designed for delivering the thick matter with the delivery volumetric flow rate (QF) at a delivery-volumetric-flow-rate target value (QFS) by generating the overall drive volumetric flow rate (QA) with the determined overall-drive-volumetric-flow-rate target value (QAS) by setting the first pump parameter (P 5 ) to the determined first parameter target value (P 5 S) and the second pump parameter (P 7 ) to the determined second parameter target value (P 7 S).