Method for operating a construction-material and / or viscous-material pump system, and construction-material and / or viscous-material pump system

Abstract

The invention relates to a method for operating a construction-material and / or viscous-material pump system (1), the construction-material and / or viscous-material pump system (1) comprising: - a construction-material and / or viscous-material delivery system (2), which is designed to deliver construction material and / or viscous material (BDS) with a variably adjustable delivery flow (FF), and - a hydraulic drive system (3), which has the following for driving the construction-material and / or viscous-material delivery system (2): - at least one drive cylinder (4a, 4b) and at least one associated drive piston (5a, 5b) which is arranged for stroke movement in the drive cylinder (4a, 4b), - a drive pump device (6) which has at least one, in particular exactly one, drive pump (7) which is designed to rotate at a variably adjustable pump rotational speed (n7) in order to generate a variably adjustable drive flow (AF) of hydraulic fluid (HF) for stroke movement of the drive piston (5a, 5b), and - a drive motor device (8) which has at least one, in particular exactly one, electric drive motor (9) which is designed to variably adjust the motor rotational speed (n9) of the electric drive motor in order to rotate the drive pump (7) at the pump rotational speed (n7) in order to generate the drive flow (AF), - wherein the method has the steps of: a) accelerating the drive piston (5a, 5b) away from a stroke starting point (HAPa, HAPb) of the drive piston (5a, 5b) in order to start the stroke movement by increasing the motor rotational speed (n9), in particular from zero, and b) braking the drive piston (5a, 5b) to a stroke end point (HEPa, HEPb) of the drive piston (5a, 5b) in order to end the stroke movement by lowering the motor rotational speed (n9), in particular at least to zero.

Description

[0001] Method for operating a construction and / or slurry pumping system and construction and / or slurry pumping system

[0002] FIELD OF APPLICATION AND STATE OF THE ART

[0003] The invention relates to a method for operating a construction and / or slurry pumping system and to such a construction and / or slurry pumping system.

[0004] TASK AND SOLUTION

[0005] The object of the invention is to provide a method for operating a construction and / or slurry pumping system and such a construction and / or slurry pumping system, each of which has improved properties.

[0006] The invention solves this problem by providing a method and a construction and / or slurry pumping system as described in the independent claims. Advantageous developments of the invention are described in the dependent claims.

[0007] The method according to the invention is for operating a construction and / or slurry pumping system, in particular for conveying construction and / or slurry. The construction and / or slurry pumping system has a construction and / or slurry conveying system and, in particular, a hydraulic drive system. The construction and / or slurry conveying system is designed to convey the construction and / or slurry with a variably adjustable conveying flow or conveying volume flow. The hydraulic drive system has, for driving the construction and / or slurry conveying system, at least one drive cylinder and at least one associated drive piston, in particular, a drive pump device and, in particular, a drive motor device, and is designed, in particular, for driving. The drive piston is arranged and, in particular, designed for reciprocating movement in the drive cylinder. The drive pump device has at least, in particular, one drive pump.The drive pump is designed to rotate at a variably adjustable pump speed at least partially, in particular completely, to generate a variably adjustable drive flow or drive volume flow of hydraulic fluid for the reciprocating movement of the drive piston. The drive motor device has at least, in particular exactly, one electric drive motor. The electric drive motor is designed to variably adjust its motor speed for, in particular directly, rotating or driving the drive pump at the pump speed to generate the drive flow. The method has the steps: a) accelerating the drive piston away from a stroke start point of the drive piston, in particular from the stroke start point, to begin the reciprocating movement at least partially, in particular completely, caused by increasing the motor speed, in particular from zero.b) Braking the drive piston towards a stroke end point of the drive piston, in particular up to the stroke end point, to terminate the stroke movement at least partially, in particular completely, caused by reducing the engine speed, in particular at least to zero, in particular exactly to zero.

[0008] This enables precise, dynamic and / or efficient, in particular power-efficient, operation of the hydraulic drive system, and in particular thus of the construction and / or thick matter pump system, in particular in a partial load operation or partial load range or for a low to medium and / or non-maximum, in particular maximum possible, flow rate or drive flow.

[0009] In particular, the method, operation, conveyance, driving, lifting, rotating, generating, adjusting, accelerating, increasing, decelerating and / or lowering can be automatic and / or computer-implemented.

[0010] The term “comprises” or “has” can be used synonymously with the term “comprises”.

[0011] The term “configured,” “established,” or “intended” can be used synonymously with the term “trained.”

[0012] The building material can be mortar, cement, screed, concrete, and / or plaster. Additionally or alternatively, the thickener can be sludge.

[0013] The construction and / or slurry pumping system may be a concrete pumping system and / or mobile, in particular a car construction and / or slurry pumping system.

[0014] The terms "adjustable" or "changeable" can be used synonymously with the phrase "variably adjustable," and the terms "adjusting" or "changing" can be used synonymously with the phrase "variable adjustment." Variable adjustment or variable adjustment can be set to at least three different values ​​or amounts, especially continuously.

[0015] The flow, pump speed, drive flow and / or motor speed may have a value or an amount.

[0016] The term “belonging” can be used synonymously with the term “assigned”.

[0017] The hydraulic fluid can be hydraulic oil.

[0018] The lifting movement and / or the rotation can be variable.

[0019] The drive pump device can be at least partially, in particular completely, variably operated.

[0020] At least partially can mean, in particular, at least 50% (percent), in particular at least 60%, in particular at least 70%, in particular at least 80%, in particular at least 90%.

[0021] The electric drive motor can be variably operated or have variable speed and / or, in particular, be electrically controllable.

[0022] The adjustment, increase and / or decrease can be carried out in a targeted and / or controlled manner, in particular by means of a control device of the construction and / or slurry pump system.

[0023] Step a) may include controlling the increase.

[0024] Step b) may comprise controlling the lowering.

[0025] This can enable optimized running behavior, particularly through the full controllability, in particular controllability, of the electric drive motor, and in particular thus a reduction or even an avoidance of damaging peaks or spikes, in particular a pressure of the construction and / or thick material and / or the hydraulic fluid.

[0026] The term "electric machine" can be used synonymously with the term "electric drive motor." The term "control" or "regulation" can be used synonymously with the term "control."

[0027] The term “take place” can be used synonymously with the phrase “be carried out”.

[0028] The electric drive motor may be a controlling variable and / or a load may or may not be the controlling variable.

[0029] The acceleration can be positive and / or coincide with the increase.

[0030] The deceleration can be negative and / or coincident with the deceleration.

[0031] Step a) may or may not involve braking the drive piston and / or reducing the engine speed.

[0032] Step b) may or may not involve accelerating the drive piston and / or increasing the engine speed.

[0033] Step a) can be, in particular be carried out for, in particular a maximum of, one, in particular first, half or up to one half of a path or a distance of the lifting movement.

[0034] Step b) can be, in particular be carried out starting from one half or for, in particular at most, a further, in particular second, half of the path or the distance of the lifting movement.

[0035] The term “beginning” can be used synonymously with the term “beginning”.

[0036] The stroke start point and the stroke end point can be different.

[0037] The term “direction reversal point” can be used synonymously with the term “stroke end point” or “stroke start point”.

[0038] The term "position" can be used synonymously with the term "point." Step a) can be performed repeatedly, especially multiple times.

[0039] Step b) can be carried out temporally, in particular immediately, after step a) and / or, in particular several times, repeatedly.

[0040] The process can be carried out, in particular multiple times, repeatedly and / or continuously or continuously.

[0041] The term “direct” can be used synonymously with the term “immediate”.

[0042] The term “effects” can be used synonymously with the term “causes”.

[0043] The drive motor device may or may not have an internal combustion engine.

[0044] For further information, please refer to the specialist literature.

[0045] In a further development of the invention, the electric drive motor is a synchronous motor, in particular a permanent magnet motor, and / or with an associated frequency converter of the hydraulic drive system. This enables particularly efficient operation of the hydraulic drive system. In particular, the terms "synchronous machine" or "synchronous drive motor" can be used synonymously with the term "synchronous motor." Additionally or alternatively, the synchronous motor can be liquid-cooled, in particular water-, glycol-, and / or oil-cooled, in particular with a water-glycol mixture. For further details, reference is made to the relevant specialist literature.

[0046] Additionally or alternatively, the electric drive motor can be a separately excited synchronous motor, a reluctance motor, an asynchronous motor and / or a hybrid such as a permanently excited reluctance motor and / or an asynchronous motor with permanent magnets.

[0047] In a further development of the invention, the pump speed depends on the engine speed; in particular, the pump speed corresponds to, or is equal to, the engine speed. In particular, this can be permanent over time or over at least one cycle of the stroke movement. This enables simple operation of the hydraulic drive system, in particular simple control of the drive pump. Additionally or alternatively, the hydraulic drive system can have a transmission, in particular with a constant or permanent transmission ratio, between the drive motor device, in particular the electric drive motor, and the drive pump device, in particular the drive pump. In particular, the electric drive motor can be used to rotate the drive pump by means of the transmission and / or the electric drive motor and the drive pump can be mechanically connected by means of the transmission.

[0048] In a further development of the invention, a pump shaft of the drive pump and a motor shaft of the electric drive motor are mechanically rigidly or non-rotatably connected to one another, in particular the electric drive motor is seated on the pump shaft. Additionally or alternatively, the drive pump and the electric drive motor are directly flanged to one another. This enables the pump speed to be dependent on the motor speed and / or a simple connection and / or, in particular thus, a simple structure of the hydraulic drive system, and in particular thus of the construction and / or slurry pump system, in particular with few components. In particular, the pump shaft can be a pump drive shaft. Additionally or alternatively, the motor shaft can be a motor output shaft. Further additionally or alternatively, the electric drive motor can be connected to the pump shaft without or can or does not need to be connected to it by or via a separable clutch or a freewheel.

[0049] In a further development of the invention, the drive pump is a fixed-displacement pump, in particular an axial piston fixed-displacement pump. This enables particularly efficient operation of the hydraulic drive system. In particular, the axial piston fixed-displacement pump can have an even number of pistons and / or at least 10, in particular at least 16, in particular 24, pistons. This can enable a reduction in vibrations. For further information, reference is made to the relevant literature.

[0050] In a further development of the invention, the drive pump is designed to rotate in the opposite direction of rotation to generate the drive flow in the opposite direction for the reciprocating movement of the drive piston in the opposite direction. The electric drive motor is designed to reverse its direction of rotation to rotate the drive pump in the opposite direction of rotation to generate the drive flow in the opposite direction. The method comprises the steps, in particular chronologically after steps a) and b): c) accelerating the drive piston away from the stroke end point as a further stroke starting point of the drive piston, in particular from the further stroke starting point, to start the reciprocating movement in the opposite direction at least partially, in particular completely, caused by increasing the motor speed, in particular from zero, in the opposite direction of rotation.d) Braking of the drive piston towards the stroke start point as a further stroke end point of the drive piston, in particular up to the further stroke end point, in order to terminate the stroke movement in the reverse direction at least partially, in particular completely, caused by reducing the engine speed, in particular at least to zero, in particular exactly to zero, in the reverse direction of rotation.

[0051] This enables simple and / or dynamic operation, in particular control, of the hydraulic drive system, in particular a simple and / or rapid change or switching between the suction and displacement stroke or a conveying direction, and / or a simple design of the hydraulic drive system, and thus in particular of the construction and / or slurry pump system, in particular with few components. Additionally or alternatively, a fixed-displacement pump can be advantageous for this, in particular being fast and / or efficient and / or compared to a swivel pump.

[0052] In particular, the term “opposite” can be used synonymously with the term “reverse”.

[0053] The stroke movement can be between the stroke start point and the stroke end point or the cycle of the stroke movement can be back and forth.

[0054] Step c) may include controlling the increase.

[0055] Step d) may comprise controlling the lowering.

[0056] Step c) may or may not involve braking the drive piston and / or reducing the engine speed.

[0057] Step d) may or may not involve accelerating the drive piston and / or increasing the engine speed.

[0058] Step c) can be executed for, in particular, a maximum of, the further half or up to the further half of the path. Step d) can be executed from the further half or for, in particular, a maximum of, one half of the path.

[0059] Step c) can be carried out temporally, in particular immediately, after step b) and / or, in particular several times, repeatedly.

[0060] Step d) can be carried out temporally, in particular immediately, after step c) and / or, in particular several times, repeatedly.

[0061] Step a) can be carried out temporally, in particular immediately, after step d), in particular repeatedly.

[0062] For further information, please refer to the specialist literature.

[0063] In a further development of the invention, the method comprises, in particular, the step of: determining, in particular calculating and / or detecting, at least one position variable characteristic of a position of the drive piston in the drive cylinder, in particular by means of a position detection device. Step a) and / or step b), and in particular step c) and / or step d), are / is carried out as a function of the determined position variable. This enables precise operation of the hydraulic drive system, in particular precise control of the electric drive motor. In particular, the determination can be automatic and / or computer-implemented and / or can be timed to coincide with the stroke movement, in particular with step a), step b), step c) and / or step b). Additionally or alternatively, the position variable can have a value or an amount.Furthermore, or alternatively, the terms "characteristic" or "representative" can be used synonymously with the term "characteristic." Furthermore, or alternatively, the position can be the stroke end point or the stroke start point. Furthermore, or alternatively, the position detection device can be electrical and / or at least one limit switch or a position sensor or position measuring system and / or of the construction and / or slurry pump system, in particular the hydraulic drive system. For further information, reference is made to the relevant specialist literature.

[0064] In a further development of the invention, at least the drive pump device and the drive cylinder form a, particularly completely closed, drive circuit for hydraulic fluid. This, in particular this and the fixed-displacement pump, enable highly dynamic operation, particularly control, of the hydraulic drive system, and thus in particular of the construction and / or slurry pump system, with very rapid direction reversal in each stroke.

[0065] In a further development of the invention, the hydraulic drive system has at least, in particular exactly, two drive cylinders and at least, in particular exactly, two respectively associated drive pistons, and in particular a rocking line for hydraulic fluid. The drive pistons are arranged and in particular designed for, in particular for the and / or respective, lifting movement in the, in particular respective, drive cylinders. In particular, at least the drive pump device and the drive cylinders form a, in particular the and / or closed, drive circuit for hydraulic fluid by means of the rocking line. The drive pistons are phase-coupled by means of the rocking line, in particular at least for a specific time or stroke section, in particular permanently, in particular in antiphase or for counter-directional lifting movement. For further information, reference is made to the specialist literature.

[0066] In a further development of the invention, the construction and / or high-density material conveying system has at least one conveying cylinder, in particular exactly two conveying cylinders, at least one associated conveying piston, in particular exactly two associated conveying pistons, and at least one associated piston rod, in particular exactly two associated piston rods, in particular for conveying construction and / or high-density material. The conveying piston is arranged and in particular designed for a lifting movement in the conveying cylinder. The lifting movement of the conveying piston and the lifting movement of the drive piston are coupled by means of the piston rod, in particular permanently. In particular, the piston rod can be fastened to the conveying piston and to the drive piston. Additionally or alternatively, the conveying cylinder can be designed to receive construction and / or high-density material and to discharge the received construction and / or high-density material.The delivery piston can be designed to suck in building and / or high-density material into the delivery cylinder and to expel the sucked-in building and / or high-density material from the delivery cylinder through its stroke. For further information, please refer to the relevant literature.

[0067] The construction and / or slurry pump system according to the invention comprises the construction and / or slurry conveying system and the hydraulic drive system. The construction and / or slurry conveying system is designed to convey the construction and / or slurry with the variably adjustable conveying flow. The hydraulic drive system has, for driving the construction and / or slurry conveying system, at least one drive cylinder, at least one associated drive piston, the drive pump device, and the drive motor device. The drive piston is arranged in the drive cylinder for the reciprocating movement. The drive pump device has at least one drive pump. The drive pump is designed to rotate at the variably adjustable pump speed to generate the variably adjustable drive flow from the hydraulic fluid for the reciprocating movement of the drive piston. The drive motor device has at least one electric drive motor.The electric drive motor is designed to variably adjust its motor speed to rotate the drive pump at the pump speed to generate the drive flow. The construction and / or slurry pump system is designed to accelerate the drive piston from the starting point of the drive piston's stroke to the beginning of the stroke movement by increasing the motor speed, and to decelerate the drive piston toward the end point of the drive piston's stroke to end the stroke movement by decreasing the motor speed.

[0068] The construction and / or slurry pumping system can provide the same advantage(s) as mentioned for the process above.

[0069] In particular, the construction and / or slurry pump system, in particular the control device, can be designed to carry out the method, in particular automatically, as mentioned above. Additionally or alternatively, the English formulation “programmed to perform the function / s of” can be used synonymously with the term “designed”. Further additionally or alternatively, the construction and / or slurry pump system, in particular the control device, can be electric and / or have a computing device and / or a processor and / or a microcontroller and / or a memory device and / or a computer. Further additionally or alternatively, the construction and / or slurry pump system can be designed at least partially, in particular completely, as mentioned above for the method.

[0070] BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Further advantages and aspects of the invention emerge from the claims and from the description of exemplary embodiments of the invention, which are explained below with reference to the figures. In the figures: Fig. 1 shows a first schematic circuit diagram of a construction and / or slurry pumping system according to the invention in a method according to the invention for operating the construction and / or slurry pumping system, comprising precisely one fixed-displacement pump, precisely one electric drive motor, and a closed drive circuit for hydraulic fluid.

[0072] Fig. 2 shows a second schematic circuit diagram of the construction and / or thick matter pump system according to the invention in the method according to the invention for operating the construction and / or thick matter pump system comprising exactly one fixed pump, exactly one electric drive motor and an open drive circuit for hydraulic fluid,

[0073] Fig. 3 shows a third schematic circuit diagram of the construction and / or thick matter pump system according to the invention in the method according to the invention for operating the construction and / or thick matter pump system comprising a fixed pump, an electric drive motor, a swivel pump, a further drive motor and a closed drive circuit for hydraulic fluid,

[0074] Fig. 4 shows a fourth schematic circuit diagram of the construction and / or slurry pumping system according to the invention in the method according to the invention for operating the construction and / or slurry pumping system comprising a fixed displacement pump, an electric drive motor, a swivel pump, a further drive motor and a closed drive circuit for hydraulic fluid in connection with an open drive circuit for hydraulic fluid,

[0075] Fig. 5 shows a graph of a flow rate of construction and / or thick matter conveyed by means of a construction and / or thick matter conveying system and a drive flow of hydraulic fluid generated by means of a hydraulic drive system, a swivel angle of the swivel pump as well as a motor speed of the electric drive motor and a motor speed of the further drive motor of the construction and / or thick matter pumping system, each over time,

[0076] Fig. 6 is a schematic efficiency map of the electric drive motor, and Fig. 7 is a further schematic circuit diagram of the construction and / or

[0077] Thick matter pump system comprising a construction and / or thick matter conveying system.

[0078] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0079] Fig. 1 to 4, 5, 6 and 7 show a construction and / or thick matter pumping system 1 according to the invention and a method according to the invention for operating the construction and / or thick matter pumping system 1.

[0080] The construction and / or thick matter pumping system 1 comprises a construction and / or thick matter conveying system 2 and a hydraulic drive system 3. The construction and / or thick matter conveying system 2 is designed, in particular, to convey construction and / or thick matter BDS with a variably adjustable conveying flow FF. The hydraulic drive system 3 comprises, in particular drives, at least one drive cylinder 4a, 4b and at least one associated drive piston 5a, 5b, a drive pump device 6, and a drive motor device 8 for driving the construction and / or thick matter conveying system 2. The drive piston 5a, 5b is arranged, in particular moves, in the drive cylinder 4a, 4b for reciprocating movement. The drive pump device 6 comprises at least one drive pump 7.The drive pump 7 is designed to rotate at a variably adjustable pump speed n7 to generate a variably adjustable drive flow AF of hydraulic fluid HF for the reciprocating movement of the drive piston 5a, 5b, in particular, it rotates and thus generates. The drive motor device 8 has at least one electric drive motor 9. The electric drive motor 9 is designed to variably adjust its motor speed n9 to rotate the drive pump 7 at the pump speed n7 to generate the drive flow AF, in particular, it adjusts and thus rotates.

[0081] The method comprises the following steps: a) Accelerating the drive piston 5a, 5b from a stroke starting point HAPa, HAPb of the drive piston 5a, 5b to begin the stroke movement by increasing the motor speed n9, in particular from zero. b) Braking the drive piston 5a, 5b to a stroke end point HEPa, HEPb of the drive piston 5a, 5b to end the stroke movement by reducing the motor speed n9, in particular at least to zero.The construction and / or thick matter pump system 1, in particular a control device of the construction and / or thick matter pump system 1, is designed to: accelerate the drive piston 5a, 5b away from the stroke start point HAPa, HAPb of the drive piston 5a, 5b to the start of the stroke movement by increasing the engine speed n9, in particular increases and thus accelerates, and to brake the drive piston 5a, 5b to the stroke end point HEPa, HEPb of the drive piston 5a, 5b to end the stroke movement by reducing the engine speed n9, in particular reduces and thus brakes.

[0082] In detail, the electric drive motor 9 is a synchronous motor 9', in particular a permanent magnet motor, and / or with an associated frequency converter 10 of the hydraulic drive system 3.

[0083] Furthermore, the pump speed n7 depends on the motor speed n9. In particular, the pump speed n7 corresponds to, and is equal to, the motor speed n9.

[0084] In addition, a pump shaft W7 of the drive pump 7 and a motor shaft W9 of the electric drive motor 9 are mechanically rigidly connected to each other. Additionally or alternatively, the drive pump 7 and the electric drive motor 9 are directly flanged to each other.

[0085] In particular, the drive pump device 6 can comprise exactly the drive pump 7 entirely for generating the drive flow AF of hydraulic fluid HF, as shown in Figs. 1 and 2, or at least one further drive pump 7W precisely partially for generating the drive flow AF, as shown in Figs. 3 and 4 and 5. In particular, the drive pump 7 can be large, and the further drive pump 7W can be small in comparison. Additionally or alternatively, the drive pump 7 and the further drive pump 7W can be independent of each other.

[0086] Further additionally or alternatively, the drive motor device 8 can comprise exactly the electric drive motor 9, in particular exactly for the drive pump 7, as shown in Figs. 1 and 2, or at least one further drive motor 9W, in particular exactly for the further drive pump 7W, as shown in Figs. 3 and 4 and 5.

[0087] In addition, the drive pump 7 is a constant pump 7', in particular an axial piston constant pump 7". In particular, the further drive pump 7W can be a variable displacement pump 7W", in particular a pivoting pump 7W" with a variably adjustable pivot angle W7W.

[0088] Furthermore, the drive pump 7 is designed to rotate in the reverse direction of rotation to generate the drive flow AF in the reverse direction for the reciprocating movement of the drive piston 5a, 5b in the reverse direction, in particular rotates in the reverse direction of rotation and thus generates, as shown in Figs. 1 and 3 and 5. The electric drive motor 9 is designed to reverse its direction of rotation to rotate the drive pump 7 in the reverse direction of rotation to generate the drive flow AF in the reverse direction, in particular reverses and thus rotates. The method comprises the steps, in particular chronologically after steps a) and b): c) accelerating the drive piston 5a, 5b away from the stroke end point HRPa, HEPb as a further stroke start point HAPa', HAPb' of the drive piston 5a, 5b to begin the reciprocating movement in the reverse direction by increasing the motor speed n9, in particular from zero, in the reverse direction of rotation.d) Braking of the drive piston 5a, 5b to the stroke start point HAPa, HAPb as a further stroke end point HEPa', HEPb' of the drive piston 5a, 5b to terminate the stroke movement in the reverse direction by reducing the motor speed n9, in particular at least to zero, in the reverse direction of rotation.

[0089] In particular, the swivel pump 7W" can be designed for, in particular rapid, swiveling precisely partially to generate the drive flow AF in the opposite direction, in particular swivels and thus generates, in particular temporally with and / or after the reduction of the engine speed n9 and / or temporally before and / or with the increase of the engine speed n9, as shown in Figs. 3 and 4 and 5.

[0090] The swivel pump 7W" can enable switching between suction and displacement strokes, and in particular, additionally, the supply and discharge of hydraulic fluid HF. Additionally or alternatively, the fixed displacement pump 7' can enable a large amount of power, especially since the swivel pump 7W" can only be efficient at a large or high swivel angle W7W.

[0091] In particular, the fixed-displacement pump 7' may or may not be configured to rotate in the opposite direction or be reversible, as shown in Figs. 2 and 4. Additionally or alternatively, the hydraulic drive system 3 may have a valve device 17, which is in particular controllable, in particular controllable by means of the control device, as shown in Figs. 2 and 4. The valve device 17 may be configured to switch between the intake and displacement strokes. For further details, reference is made to the specialist literature.

[0092] Furthermore, the method comprises, in particular, the step of determining, in particular calculating and / or detecting, at least one position variable PGa, PGb characteristic of a position Pa, Pb of the drive piston 5a, 5b in the drive cylinder 4a, 4b, in particular by means of a position detection device 11a, 11b. Step a) and / or step b) are / is carried out depending on the determined position variable PGa, PGb.

[0093] Furthermore, at least the drive pump device 6 and the drive cylinder 4a, 4b form a closed drive circuit 12' for hydraulic fluid HF, as shown in Fig. 1, 3 and 4, in particular in connection with an open drive circuit for hydraulic fluid HF, as shown in Fig. 4.

[0094] In particular, the drive pump device 6 and the drive cylinder 4a, 4b, and in particular the valve device 17, can form an open drive circuit for hydraulic fluid HF, as shown in Fig. 2.

[0095] Additionally or alternatively, in the case of the closed drive circuit 12', and in particular not in the case of the open drive circuit, the hydraulic drive system 3 can have a feed pump device that can also pump hydraulic fluid HF when switching between the intake and displacement strokes. For further information, reference is made to the relevant literature.

[0096] In addition, the hydraulic drive system 3 has at least, in the exemplary embodiments shown, two drive cylinders 4a, 4b and at least, in the exemplary embodiments shown, two respectively associated drive pistons 5a, 5b, and in particular a rocking line 13 for hydraulic fluid HF, as shown in Fig. 7. The drive pistons 5a, 5b are arranged, in particular move, in the drive cylinders 4a, 4b for reciprocating movement. In particular, at least the drive pump device 6 and the drive cylinders 4a, 4b form the, in particular closed, drive circuit 12, 12' for hydraulic fluid HF by means of the rocking line 13. The drive pistons 5a, 5b are phase-coupled by means of the rocking line 13. In alternative exemplary embodiments, the hydraulic drive system can have exactly one drive cylinder and exactly one associated drive piston, and in particular not a rocking line.

[0097] Furthermore, the construction and / or thick matter conveying system 2 comprises at least one conveying cylinder 14a, 14b, in particular exactly two conveying cylinders 14a, 14b, at least one associated conveying piston 15a, 15b, in particular exactly two associated conveying pistons 15a, 15b, and at least one associated piston rod 16a, 16b, in particular exactly two associated piston rods 16a, 16b. The conveying piston 15a, 15b is arranged for reciprocating movement in the conveying cylinder 14a, 14b, in particular moves. The reciprocating movement of the conveying piston 15a, 15b and the reciprocating movement of the drive piston 5a, 5b are coupled by means of the piston rod 16a, 16b.

[0098] Furthermore, step a) and / or step b), and in particular step c) and / or step d), can be carried out in a manner that is optimized, in particular efficiency-optimized, depending on at least one efficiency, in particular an efficiency characteristic map of the drive motor device 8, in particular of the electric drive motor 9, as shown in Fig. 6, and / or of the drive pump device 6, in particular of the drive pump 7.

[0099] Furthermore, the hydraulic drive system 3 can have an overload device, in particular a pressure relief valve device. This can enable intrinsic safety of the hydraulic drive system 3, and thus in particular of the construction and / or slurry pump system 1.

[0100] As the embodiments shown and explained above make clear, the invention provides an advantageous method for operating a construction and / or slurry pumping system and such an advantageous construction and / or slurry pumping system, each having improved properties.

Claims

Patent claims 1. A method for operating a construction and / or thick matter pumping system (1), wherein the construction and / or thick matter pumping system (1) comprises: a construction and / or thick matter conveying system (2) which is designed to convey construction and / or thick matter (BDS) with a variably adjustable conveying flow (FF), and a hydraulic drive system (3) which, for driving the construction and / or thick matter conveying system (2), comprises: at least one drive cylinder (4a, 4b) and at least one associated drive piston (5a, 5b) which is arranged for reciprocating movement in the drive cylinder (4a, 4b), a drive pump device (6) which has at least, in particular exactly, one drive pump (7) which is designed to rotate at a variably adjustable pump speed (n7) for generating a variably adjustable drive flow (AF) of hydraulic fluid (HF) for reciprocating movement of the drive piston (5a, 5b), and a drive motor device (8) which has at least, in particular,an electric drive motor (9) which is designed to variably adjust its motor speed (n9) to rotate the drive pump (7) at the pump speed (n7) to generate the drive flow (AF), wherein the method comprises the steps of: a) accelerating the drive piston (5a, 5b) from a stroke start point (HAPa, HAPb) of the drive piston (5a, 5b) to start the stroke movement by increasing the motor speed (n9), in particular from zero, and b) braking the drive piston (5a, 5b) to a stroke end point (HEPa, HEPb) of the drive piston (5a, 5b) to end the stroke movement by reducing the motor speed (n9), in particular at least to zero.

2. Method according to the preceding claim, wherein the electric drive motor (9) is a synchronous motor (9'), in particular a permanently excited one, and / or with an associated frequency converter (10) of the hydraulic drive system (3).

3. Method according to one of the preceding claims, wherein the pump speed (n7) depends on the engine speed (n9), in particular corresponds to the engine speed (n9), in particular is equal to it.

4. Method according to one of the preceding claims, wherein a pump shaft (W7) of the drive pump (7) and a motor shaft (W9) of the electric drive motor (9) are mechanically rigidly connected to one another, and / or wherein the drive pump (7) and the electric drive motor (9) are directly flanged to one another.

5. Method according to one of the preceding claims, wherein the drive pump (7) is a fixed displacement pump (7'), in particular an axial piston fixed displacement pump (7").

6. Method according to one of the preceding claims, wherein the drive pump (7) is designed to rotate in the reverse direction of rotation to generate the drive flow (AF) in the reverse direction for the reciprocating movement of the drive piston (5a, 5b) in the reverse direction, and wherein the electric drive motor (9) is designed to reverse its direction of rotation to rotate the drive pump (7) in the reverse direction of rotation to generate the drive flow (AF) in the reverse direction, the method comprising the steps, in particular chronologically after steps a) and b): c) accelerating the drive piston (5a, 5b) from the stroke end point (HEPa, HEPb) as a further stroke start point (HAPa', HAPb') of the drive piston (5a, 5b) to start the reciprocating movement in the reverse direction by increasing the motor speed (n9), in particular from zero, in the reverse direction of rotation, and d) braking the drive piston (5a, 5b) to the stroke start point (HAPa, HAPb) as another stroke end point (HEPa',HEPb') of the drive piston (5a, 5b) to terminate the stroke movement in the reverse direction by reducing the engine speed (n9), in particular at least to zero, in the reverse direction of rotation., 7. Method according to one of the preceding claims, wherein the method comprises, in particular, the step: Determining, in particular calculating and / or detecting, at least one position variable (PGa, PGb) characteristic of a position (Pa, Pb) of the drive piston (5a, 5b) in the drive cylinder (4a, 4b), in particular by means of a Position detection device (11a, 11b), and wherein step a) and / or step b) are / is carried out as a function of the determined position variable (PGa, PGb).

8. Method according to one of the preceding claims, wherein at least the drive pump device (6) and the drive cylinder (4a, 4b) form a closed drive circuit (12') for hydraulic fluid (HF).

9. Method according to one of the preceding claims, wherein the hydraulic drive system (3) comprises: at least, in particular exactly, two drive cylinders (4a, 4b) and at least, in particular exactly, two respectively associated drive pistons (5a, 5b), which are arranged in the drive cylinders (4a, 4b) for lifting movement, in particular a rocking line (13) for hydraulic fluid (HF), wherein at least the drive pump device (6) and the drive cylinders (4a, 4b) form a, in particular closed, drive circuit (12, 12') for hydraulic fluid (HF) by means of the rocking line (13), and wherein the drive pistons (5a, 5b) are phase-coupled by means of the rocking line (13).

10. Method according to one of the preceding claims, wherein the construction and / or thick material conveying system (2) comprises: at least one conveying cylinder (14a, 14b), at least one associated conveying piston (15a, 15b) and at least one associated piston rod (16a, 16b), wherein the conveying piston (15a, 15b) is arranged for lifting movement in the conveying cylinder (14a, 14b), and wherein the lifting movement of the conveying piston (15a, 15b) and the lifting movement of the drive piston (5a, 5b) are coupled by means of the piston rod (16a, 16b).

11. Construction and / or thick matter pumping system (1), in particular for carrying out a method according to one of the preceding claims, wherein the construction and / or thick matter pumping system (1) comprises: a construction and / or thick matter conveying system (2) which is designed to convey construction and / or thick matter (BDS) with a variably adjustable conveying flow (FF), and a hydraulic drive system (3) which, for driving the construction and / or thick matter conveying system (2), comprises: at least one drive cylinder (4a, 4b) and at least one associated drive piston (5a, 5b) which is arranged for lifting movement in the drive cylinder (4a, 4b), a drive pump device (6) which has at least one drive pump (7) which is designed to rotate at a variably adjustable pump speed (n7) for Generating a variably adjustable drive flow (AF) of hydraulic fluid (HF) for the reciprocating movement of the drive piston (5a, 5b), and a drive motor device (8) which has at least one electric drive motor (9) which is designed for variably adjusting its motor speed (n9) to rotate the drive pump (7) at the pump speed (n7) to generate the drive flow (AF), wherein the construction and / or thick matter pump system (1) is designed to: accelerate the drive piston (5a, 5b) from a stroke start point (HAPa, HAPb) of the drive piston (5a, 5b) to start the reciprocating movement by increasing the motor speed (n9), and to decelerate the drive piston (5a, 5b) to a stroke end point (HEPa, HEPb) of the drive piston (5a, 5b) to end the reciprocating movement by reducing the motor speed (n9).

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