Hydraulic drive system for a construction and / or thick matter pump system, construction and / or thick matter pump system, and method for operating a hydraulic drive system and / or a construction and / or thick matter pump system

Abstract

The invention relates to a hydraulic drive system (1) for a construction and / or thick matter pump system (2), - wherein the hydraulic drive system (1) comprises a first drive cylinder (3) and a second drive cylinder (4), - a first directional valve (5) and a second directional valve (6), and - a flushing hydraulic liquid device (7), - wherein the first directional valve (5) is configured to connect the first drive cylinder (3) to the second directional valve (6) by way of a first switching position (5S1) and to connect the second directional valve (6) to the flushing hydraulic liquid device (7) by way of a second switching position (5S2), and - wherein the second directional valve (6) is configured to connect the second drive cylinder (4) to the first directional valve (5) by way of a first switching position (6S1) and to connect the first directional valve (5) to the flushing hydraulic liquid device (7) by way of a second switching position (6S2).

Description

SCOPE OF APPLICATION AND STATE OF THE ART

[0001] The invention relates to a hydraulic drive system for a construction and / or viscous material pumping system, a construction and / or viscous material pumping system comprising such a hydraulic drive system, and a method for operating such a hydraulic drive system and / or such a construction and / or viscous material pumping system.

[0002] DE 10 2005 008217 A1 discloses a hydraulic drive, in particular for two-cylinder high-viscosity pumps, in which two drive cylinders are alternately supplied with pressurized oil at high and low pressure via connecting lines to at least one main pump designed as a variable displacement pump in a closed hydraulic circuit. A fresh oil flow from an oil tank feeds into the hydraulic circuit at the current low-pressure side at limited pressure, and a purge oil flow branches off from the current low-pressure side to the oil tank. The purge oil flow is temporarily blocked during each changeover of the main pump, regardless of the differential pressure in the connecting lines of the main pump. The hydraulic drive is equipped with two hydraulically actuated drive cylinders designed as piston-cylinder units.which are connected to a connecting line of the main pump via pump connections arranged at one end, forming a closed hydraulic circuit, and which communicate with each other at their ends opposite the pump connections via a rocker oil line, wherein the main pump is connected with a control mechanism for alternating reversing the delivery direction by alternately building up a high pressure and a low pressure in the two connecting lines, with a hydraulic feed pump whose suction inlet is connected to an oil tank and whose pressure outlet is limited to low pressure level and which opens into the two connecting lines of the main pump via a check valve each, and with a flushing branch integrated in the hydraulic circuit,The outlet side of the system leads into the oil tank via a pressure relief valve, and the inlet side, via a changeover valve piloted by the differential pressure prevailing between the connecting lines, diverts the flushing oil flow into the oil tank and to the respective low-pressure connecting line when differential pressure is present, and is preferably closed in its differential-pressure-neutral neutral position. The system is characterized by a shut-off mechanism that temporarily blocks the flushing oil flow during the main pump's changeover process, regardless of the differential pressure between the connecting lines. The shut-off mechanism includes a check valve arranged in the flushing line upstream of the changeover valve. TASK AND SOLUTION

[0003] The invention is based on the objective of providing a hydraulic drive system for a construction and / or viscous material pumping system, a construction and / or viscous material pumping system comprising such a hydraulic drive system and a method for operating such a hydraulic drive system and / or such a construction and / or viscous material pumping system, each of which has improved properties.

[0004] The invention solves this problem by providing a hydraulic drive system with the features of claim 1, a construction and / or high-viscosity pump system with the features of claim 14, and a method with the features of claim 15. Advantageous further developments and / or embodiments of the invention are described in the dependent claims.

[0005] The hydraulic drive system according to the invention for a construction and / or viscous material pump system comprises a first drive cylinder and a second drive cylinder, a first directional control valve and a second directional control valve, and a flushing hydraulic fluid device. The first directional control valve, in particular itself, is configured by a first switching position for connecting the first drive cylinder to the second directional control valve, or connects them together. Furthermore, the first directional control valve, in particular itself, is configured by a second switching position for connecting the second directional control valve to the flushing hydraulic fluid device, or connects them together. The second directional control valve, in particular itself, is configured by a first switching position for connecting the second drive cylinder to the first directional control valve, or connects them together.Furthermore, the second directional valve, in particular itself, is designed by a second switching position to connect the first directional valve to the flushing hydraulic fluid device or connects them together.

[0006] This enables, in particular the switching positions and connections allow, various functions of the hydraulic drive system, especially for the first drive cylinder and / or the second drive cylinder, using, in particular only, the first directional control valve and the second directional control valve. This thus allows for a cost-effective design of the hydraulic drive system.

[0007] In particular, the first drive cylinder and the second drive cylinder can be the same and / or different.

[0008] The first directional control valve and the second directional control valve can be the same and / or different.

[0009] The first switching position and the second switching position, in particular, can be different.

[0010] At any given time, the first directional control valve can be in either the first or the second switching position. Additionally or alternatively, at any given time, the second directional control valve can also be in either the first or the second switching position.

[0011] The first directional control valve and / or the second directional control valve can be switchable, adjustable, controllable, or adjustable.

[0012] The first directional control valve can be connected to or attached to the first actuator cylinder, the second directional control valve, and the hydraulic fluid purging system. Additionally or alternatively, the first directional control valve can, but need not, be connected to or attached to the second actuator cylinder, particularly without the second directional control valve.

[0013] The second directional control valve can be connected to or linked to the second actuator cylinder, the first directional control valve, and the hydraulic fluid purging system. Additionally or alternatively, the second directional control valve can, but need not, be connected to or linked to the first actuator cylinder, particularly without the first directional control valve.

[0014] The connection can be permanent and / or independent of the, in particular, first switching position and the, in particular, the respective second switching position.

[0015] The connection, in particular each, may be connected and / or linked, in particular by means of, in particular, only one, in particular each, line, and / or directly and / or for a flow of hydraulic fluid, in particular from the first-mentioned element to the second-mentioned element and / or between the mentioned elements.

[0016] The hydraulic fluid may contain oil, in particular.

[0017] The word component "Ausspeis" can be used synonymously with the word component "Ausspül".

[0018] In a further development of the invention, the first directional control valve, in its first switching position, is not configured to connect the first drive cylinder to the flushing hydraulic fluid device, particularly without the second directional control valve, nor is it configured to connect the second directional control valve to the flushing hydraulic fluid device, nor does it connect these two components. Additionally or alternatively, in its second switching position, the first directional control valve is not configured to connect the first drive cylinder to the second directional control valve, nor is it configured to connect the first drive cylinder to the flushing hydraulic fluid device, nor does it connect these two components.Furthermore, or alternatively, the second directional control valve, in its first switching position, is not designed to connect the second drive cylinder to the flushing hydraulic fluid system, particularly without the first directional control valve, nor is it designed to connect the first directional control valve to the flushing hydraulic fluid system, nor does it connect these two components. Similarly, or alternatively, the second directional control valve, in its second switching position, is not designed to connect the second drive cylinder to the first directional control valve, nor is it designed to connect the second drive cylinder to the flushing hydraulic fluid system, nor does it connect these two components. This enables, and in particular enables, the various functions through these switching positions and the absence of connections.

[0019] In a further development of the invention, a first cylinder port of the first directional control valve is connected to the first actuator cylinder. A second cylinder port of the second directional control valve is connected to the second actuator cylinder. A first purge port of the first directional control valve is connected to the purge hydraulic fluid system. A second purge port of the second directional control valve is also connected to the purge hydraulic fluid system. A first valve port of the first directional control valve and a second valve port of the second directional control valve are connected to each other. The first directional control valve, by its first switching position, connects the first cylinder port to the first valve port. Furthermore, the first directional control valve, by its second switching position, connects the first valve port to the first purge port.The second-way valve, in its first switching position, connects the second cylinder port to the second valve port. Furthermore, in its second switching position, the second-way valve connects the second valve port to the second purge port. Specifically, the first cylinder port, the second cylinder port, the first purge port, the second purge port, the first valve port, and / or the second valve port can be different. Additionally or alternatively, the first-way valve may or may not, in its first switching position, connect the first cylinder port to the first purge port or the first valve port to the first purge port.Furthermore, additionally or alternatively, the first directional control valve may or may not, by virtue of its second switching position, be configured to connect the first cylinder port to the first valve port, nor to connect the first cylinder port to the first purge port. Furthermore, additionally or alternatively, the second directional control valve may or may not, by virtue of its first switching position, be configured to connect the second cylinder port to the second purge port, nor to connect the second valve port to the first purge port. Furthermore, additionally or alternatively, the second directional control valve may or may not, by virtue of its second switching position, be configured to connect the second cylinder port to the second valve port, nor to connect the second cylinder port to the second purge port.do not connect them.

[0020] In a further development of the invention, the first directional control valve is a first at least 3-way / at least 2-way valve, in particular a first 4 / 2-way valve, especially with a first unused port. Additionally or alternatively, the second directional control valve is a second at least 3-way / at least 2-way valve, in particular a second 4 / 2-way valve, especially with a second unused port. This enables the switching positions and connections. In particular, the first 4 / 2-way valve and / or the second 4 / 2-way valve enable the use of at least one standard component. This thus allows for a cost-effective design of the hydraulic drive system.

[0021] In a further development of the invention, the first directional control valve is a first cartridge valve and / or a first build-up valve. Additionally or alternatively, the second directional control valve is a second cartridge valve and / or a second build-up valve. This allows for a high flow rate and / or a high pressure of hydraulic fluid.

[0022] In a further development of the invention, the first directional control valve and / or the second directional control valve are designed to be electrically switchable. In particular, the first directional control valve and / or the second directional control valve are designed to switch automatically to their respective second switching position when de-energized. This enables simple switching of the first directional control valve and / or the second directional control valve. In particular, this enables a flushing hydraulic fluid shutdown function for the first directional control valve and / or the second directional control valve in their second switching positions. In particular, the first directional control valve and / or the second directional control valve can be designed to be hydraulically switchable without being hydraulically switchable. Additionally or alternatively, the phrase "in a de-energized state" can be used synonymously with the term "de-energized".Alternatively, the first directional control valve and / or the second directional control valve can be designed to switch independently to the, in particular, respective first switching position when de-energized.

[0023] In a further development of the invention, the first directional control valve is configured, by its first switching position, to connect one side, in particular a bottom side, of the first drive cylinder to the second directional control valve. The second directional control valve is configured, by its first switching position, to connect one side, in particular a bottom side, of the second drive cylinder that is identical to, or in particular of a similar type to, the side of the first drive cylinder to the first directional control valve. This enables, in particular, the first directional control valve and the second directional control valve in their first switching positions to connect the corresponding sides of the first drive cylinder and the second drive cylinder. This thus enables a cylinder locking function, which is particularly advantageous when connecting the bottom sides of the first drive cylinder and the second drive cylinder.

[0024] In a further development of the invention, the hydraulic drive system comprises a first drive piston and a second drive piston, a first piston rod and a second piston rod, and at least, and in particular only, one, and in particular a single, water reservoir. The first drive piston is arranged in the first drive cylinder. The second drive piston is arranged in the second drive cylinder. The first piston rod is attached to the first drive piston. The second piston rod is attached to the second drive piston. Furthermore, the first piston rod and the second piston rod pass through the at least one water reservoir. The cylinder locking function, particularly when the bottom ends of the first drive cylinder and the second drive cylinder are connected to each other, prevents the at least one water reservoir from overflowing, especially when a drive cylinder is retracted.In particular, the first drive piston and the second drive piston can be identical and / or different. Additionally or alternatively, the first piston rod and the second piston rod can be identical and / or different.

[0025] In a further development of the invention, the hydraulic drive system features a rocker connection. The rocker connection connects the first drive cylinder and the second drive cylinder to each other. This is advantageous when connecting the same sides, in particular the bottom sides, of the first drive cylinder and the second drive cylinder. In particular, the rocker connection can connect a side that differs from the first drive cylinder, in particular a rod side, to a side that differs from the second drive cylinder, in particular a rod side. Additionally or alternatively, the rocker connection can include a rocker link, in particular a rocker link.

[0026] In particular, the rod side can refer to the side of the drive cylinder where the piston rod can be attached to the drive piston. Additionally or alternatively, the bottom side can refer to the opposite side of the drive cylinder. Furthermore, the first drive piston and the second drive piston can be coupled by means of the rocker connection, in particular in opposite phases.

[0027] In a further development of the invention, the flushing hydraulic fluid device comprises a hydraulic fluid tank, in particular a hydraulic fluid cooler and / or a hydraulic fluid cleaner. This enables the storage, in particular cooling and / or cleaning, of hydraulic fluid, especially flushed fluid. The hydraulic fluid cleaner may, in particular, include a filter.

[0028] In a further development of the invention, the first directional control valve and the second directional control valve can be switched independently of each other. This enables a multitude of functions. In particular, the term "separately" can be used synonymously with the term "independently".

[0029] In a further development of the invention, the hydraulic drive system comprises a control device. The control device is configured to switch the first directional control valve to the first switching position and / or the second switching position, and the second directional control valve to the first switching position and / or the second switching position, in particular for a switching-flushing function, a flushing-hydraulic fluid shut-off function, and / or a cylinder locking function. This enables efficient, and in particular simple and / or cost-effective, operation of the hydraulic drive system and / or, in particular, the construction and / or viscous material pumping system. The control device can be electrical. Additionally or alternatively, the control device can include a processor and / or a memory.Furthermore, or alternatively, the terms "actuator" or "control device" can be used synonymously with the term "control unit". Similarly, or alternatively, the terms "adjust", "control", or "monitor" can be used synonymously with the term "switching". Additionally, or alternatively, the switching can be automatic.

[0030] In particular, the alternating flushing function enables, and in particular makes possible, the flushing of hydraulic fluid, especially from the first drive cylinder and / or the second drive cylinder.

[0031] Additionally or alternatively, the flushing hydraulic fluid shutdown function, when implemented, prevents the flushing of hydraulic fluid, particularly from connecting the first and second drive cylinders to each other. Additionally or alternatively, the flushing hydraulic fluid shutdown function allows for delayed valve switching during a reversing operation. In particular, the reversing operation can be the most critical moment in which low-pressure drops can occur. The flushing hydraulic fluid shutdown function, activated shortly before the reversing operation, can significantly reduce or even prevent these low-pressure drops. This can have a positive effect on the service life of the main pumps in the hydraulic drive system.

[0032] Furthermore, or alternatively, the cylinder locking function, particularly when the bottom sides of the first drive cylinder and the second drive cylinder are connected, prevents the overflow of at least one water tank, especially when a drive cylinder is pushed back, and in particular prevents hydraulic fluid from being flushed out.

[0033] In one embodiment of the invention, the hydraulic drive system comprises at least one sensor. The at least one sensor is designed to detect a temperature, in particular a temperature value, or a temperature-dependent parameter, in particular a temperature value, and / or a degree of contamination, in particular a degree of contamination, or a degree of contamination dependent on the degree of contamination, in particular a degree of contamination value, of the hydraulic drive system and / or hydraulic fluid. The control device is designed for switching, in particular for the alternating flushing function, depending on the detected temperature or temperature parameter and / or the detected degree of contamination or degree of contamination. This enables demand-based switching, in particular flushing.This allows for faster warm-up and / or, in particular, reduced wear of the hydraulic drive system. This, in turn, enables efficient, reliable, and / or cost-effective operation of the hydraulic drive system and / or, in particular, the construction and / or viscous material pumping system. The sensor can be electrical. Additionally or alternatively, the detection can be automatic. Furthermore, the hydraulic fluid can be retained.

[0034] The construction and / or viscous material pumping system according to the invention comprises a construction and / or viscous material conveying system and, in particular, a hydraulic drive system as previously mentioned. The construction and / or viscous material conveying system is designed for conveying construction and / or viscous material. The hydraulic drive system is designed for driving the construction and / or viscous material conveying system. In particular, the conveying and / or the drive can be automatic. Additionally or alternatively, "viscous material" can refer to sludge. Furthermore, additionally or alternatively, "construction and / or viscous material" can refer to mortar, cement, screed, concrete, and / or plaster. In particular, the construction and / or viscous material pumping system can be referred to as a concrete pumping system. Furthermore, additionally or alternatively, the construction and / or viscous material pumping system can be mobile, in particular as a truck-mounted construction and / or viscous material pumping system.

[0035] The inventive method for operating a hydraulic drive system, in particular the one mentioned above, and / or a construction and / or viscous material pump system, in particular the one mentioned above, comprises, in particular, the step of: switching the first directional control valve to the first switching position or the second switching position and the second directional control valve to the first switching position or the second switching position, in particular for an alternating flushing function, in particular a flushing hydraulic fluid shut-off function, or in particular a cylinder locking function. In particular, the method and / or the operation and / or the switching can be automatic. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Further advantages and aspects of the invention will become apparent from the claims and from the description of exemplary embodiments of the invention, which are explained below with reference to the figures. These figures show: Fig. 1 shows a schematic circuit diagram of a hydraulic drive system according to the invention for a construction and / or viscous material pump system according to the invention; Fig. 2 shows a schematic circuit diagram of a section of the hydraulic drive system. Fig. 1 and a construction and / or viscous material conveying system of the construction and / or viscous material pumping system according to the invention, Fig. 3 a schematic perspective view of a section of the hydraulic drive system of the Fig. 1 featuring a separate valve block, and Fig. 4 a schematic perspective view of a section of the hydraulic drive system of the Fig. 1 featuring an integrated valve block. DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0037] Fig. 1 bis 4 Figure 1 shows a hydraulic drive system 1 according to the invention for a construction and / or high-viscosity pump system 2. The hydraulic drive system 1 comprises a first drive cylinder 3 and a second drive cylinder 4, a first directional control valve 5 and a second directional control valve 6, and a flushing hydraulic fluid device 7. The first directional control valve 5 is configured by a first switching position 5S1 for connecting the first drive cylinder 3 to the second directional control valve 6, in particular connecting them. Furthermore, the first directional control valve 5 is configured by a second switching position 5S2 for connecting the second directional control valve 6 to the flushing hydraulic fluid device 7, in particular connecting them. The second directional control valve 6 is configured by a first switching position 6S1 for connecting the second drive cylinder 4 to the first directional control valve 5, in particular connecting them.Furthermore, the second directional control valve 6 is designed by a second switching position 6S2 to connect the first directional control valve 5 with the flushing hydraulic fluid device 7, in particular connecting them together.

[0038] In detail, the first directional control valve 5, in its first switching position 5S1, is not configured to connect the first drive cylinder 3 to the flushing hydraulic fluid device 7, nor is it configured to connect the second directional control valve 6 to the flushing hydraulic fluid device 7; in particular, it does not connect them. Additionally or alternatively, the first directional control valve 5, in its second switching position 5S2, is not configured to connect the first drive cylinder 3 to the second directional control valve 6, nor is it configured to connect the first drive cylinder 3 to the flushing hydraulic fluid device 7; in particular, it does not connect them.Furthermore, or alternatively, the second directional control valve 6, in its first switching position 6S1, is not configured to connect the second drive cylinder 4 to the flushing hydraulic fluid device 7, nor to connect the first directional control valve 5 to the flushing hydraulic fluid device 7; in particular, it does not connect these two devices. Furthermore, or alternatively, the second directional control valve 6, in its second switching position 6S2, is not configured to connect the second drive cylinder 4 to the first directional control valve 5, nor to connect the second drive cylinder 4 to the flushing hydraulic fluid device 7; in particular, it does not connect these two devices.

[0039] Furthermore, a first cylinder port 51 of the first directional control valve 5 is connected to the first actuator cylinder 3. A second cylinder port 61 of the second directional control valve 6 is connected to the second actuator cylinder 4. A first purge port 52 of the first directional control valve 5 is connected to the purge hydraulic fluid device 7. A second purge port 62 of the second directional control valve 6 is also connected to the purge hydraulic fluid device 7. A first valve port 53 of the first directional control valve 5 and a second valve port 63 of the second directional control valve 6 are connected to each other. The first directional control valve 5 is configured by its first switching position 5S1 to connect the first cylinder port 51 to the first valve port 53, in particular, to connect them to each other.Furthermore, the first directional control valve 5 is configured by the second switching position 5S2 to connect the first valve port 53 with the first purge port 52, in particular connecting them together. The second directional control valve 6 is configured by the first switching position 6S1 to connect the second cylinder port 61 with the second valve port 63, in particular connecting them together. Furthermore, the second directional control valve 6 is configured by the second switching position 6S2 to connect the second valve port 63 with the second purge port 62, in particular connecting them together.

[0040] Furthermore, the first directional control valve 5 is a first at least 3-way / at least 2-way valve 5', in particular a first 4 / 2-way valve 5", especially with a first unused port 54. Additionally or alternatively, the second directional control valve 6 is a second at least 3-way / at least 2-way valve 6', in particular a second 4 / 2-way valve 6", especially with a second unused port 64.

[0041] Furthermore, the first directional control valve 5 is a first cartridge valve 5"' and / or a first build-up valve 5"". Additionally or alternatively, the second directional control valve 6 is a second cartridge valve 6‴ and / or a second build-up valve 6"".

[0042] Furthermore, the first directional control valve 5 and / or the second directional control valve 6 are electrically switchable. In particular, the first directional control valve 5 and / or the second directional control valve 6 are designed to switch automatically to the second switching position 5S2, 6S2 when de-energized.

[0043] Furthermore, the first directional control valve 5 is configured by its first switching position 5S1 to connect a side 3S, in particular a bottom side 3BS, of the first drive cylinder 3 with the second directional control valve 6. The second directional control valve 6 is configured by its first switching position 6S1 to connect a side 4S, in particular a bottom side 4BS, of the second drive cylinder 4, which corresponds to the side 3S of the first drive cylinder 3, with the first directional control valve 5.

[0044] The hydraulic drive system 1 further comprises a first drive piston 11 and a second drive piston 12, a first piston rod 13 and a second piston rod 14, and at least one water reservoir 15. The first drive piston 11 is located in the first drive cylinder 3. The second drive piston 12 is located in the second drive cylinder 4. The first piston rod 13 is attached to the first drive piston 11. The second piston rod 14 is attached to the second drive piston 12. Furthermore, the first piston rod 13 and the second piston rod 14 pass through the at least one water reservoir 15.

[0045] Furthermore, the hydraulic drive system 1 has a rocker connection 16. The rocker connection 16 connects the first drive cylinder 3 and the second drive cylinder 4 to each other.

[0046] In particular, the swing connection 16 connects a rod side 3TS of the first drive cylinder 3 and a rod side 4TS of the second drive cylinder 4.

[0047] Furthermore, the flushing hydraulic fluid device 7 includes a hydraulic fluid tank 17, in particular a hydraulic fluid cooler 18 and / or a hydraulic fluid cleaner 19.

[0048] Furthermore, the first directional control valve 3 and the second directional control valve 4 can be switched independently of each other.

[0049] Furthermore, the hydraulic drive system 1 has a control device 20. The control device 20 is designed to switch the first directional control valve 5 to the first switching position 5S1 and / or the second switching position and the second directional control valve 6 to the first switching position 6S1 and / or the second switching position, in particular for a switching flushing function WAF, a flushing hydraulic fluid shut-off function AHAF and / or a cylinder locking function ZSF, in particular switches.

[0050] In particular, the first directional control valve 5 in the first switching position 5S1 and the second directional control valve 6 in the second switching position 6S2 enable, and in particular implement, the alternating flushing function WAF, especially for the first drive cylinder 3. The alternating flushing function WAF enables, and in particular implements, a flushing, in particular a flow, of hydraulic fluid HF, in particular from the first drive cylinder 3 to the first directional control valve 5, from the first directional control valve 5 to the second directional control valve 6 and from the second directional control valve 6 to the flushing hydraulic fluid device 7.

[0051] Additionally or alternatively, the first directional control valve 5 in the second switching position 5S2 and the second directional control valve 6 in the first switching position 6S2 enable, and in particular implement, the alternating flushing function WAF, especially for the second drive cylinder 4. The alternating flushing function WAF enables, and in particular implements, a flushing, in particular a flow, of hydraulic fluid HF, in particular from the second drive cylinder 4 to the second directional control valve 6, from the second directional control valve 6 to the first directional control valve 5 and from the first directional control valve 5 to the flushing hydraulic fluid device 7.

[0052] In particular, the control device 20 for switching the alternating flushing function WAF for the first drive cylinder 3 and the second drive cylinder 4 is designed to be cyclically exchanged with each other, especially during operation of the hydraulic drive system 1 and / or the construction and / or thick material pumping system 2.

[0053] Furthermore, or alternatively, the first directional control valve 5 in the second switching position 5S2 and the second directional control valve 6 in the second switching position 6S2 enable, and in particular implement, the hydraulic fluid flushing shut-off function AHAF. The hydraulic fluid flushing shut-off function AHAF enables, and in particular implements, the prevention of flushing, and in particular the flow, of hydraulic fluid HF, especially from the first drive cylinder 3 and / or the second drive cylinder 4 to the hydraulic fluid flushing device 7.

[0054] Furthermore, or alternatively, the first directional control valve 5 in the first switching position 5S1 and the second directional control valve 6 in the first switching position 6S1 enable, and in particular implement, the cylinder locking function ZSF. The cylinder locking function ZSF enables, and in particular implements, a connection between the same sides 3S, 4S, especially the bottom sides 3BS, 4BS, of the first drive cylinder 3 and the second drive cylinder 4, and / or, in particular thus, a flow of hydraulic fluid HF from the first drive cylinder 3 to the first directional control valve 5, from the first directional control valve 5 to the second directional control valve 6 and from the second directional control valve 6 to the second drive cylinder 4, and / or from the second drive cylinder 4 to the second directional control valve 6, from the second directional control valve 6 to the first directional control valve 5 and from the first directional control valve 5 to the first drive cylinder 3.

[0055] In particular, the control device 20 for switching the cylinder locking function ZSF is not designed to operate during operation of the hydraulic drive system 1 and / or the construction and / or thick substance pumping system 2, especially when the diesel engine of the truck is switched off.

[0056] Furthermore, the hydraulic drive system 1 has at least one sensor 21. The at least one sensor 21 is designed to detect a temperature T or a temperature-dependent temperature parameter and / or a degree of contamination VG or a degree of contamination parameter dependent on the degree of contamination of the hydraulic drive system 1 and / or hydraulic fluid HF. The control device is designed to switch, in particular for the alternating flushing function WAF, depending on the detected temperature T or the detected temperature parameter and / or the detected degree of contamination VG or the detected degree of contamination parameter.

[0057] Furthermore, the hydraulic drive system 1 comprises at least one feed pump 22 and / or at least one drive pump 23. The feed pump 22 is designed for, in particular automatically, supplying a flow of hydraulic fluid HF from the flushing hydraulic fluid device 7, in particular the hydraulic fluid tank 17, and / or to the first drive cylinder 3 and / or the second drive cylinder 4. Additionally or alternatively, the drive pump 23 is designed for, in particular automatically, generating a flow, in particular a drive flow, of hydraulic fluid HF for the, in particular automatically, movement of the first drive piston 11 and / or the second drive piston 12.

[0058] In particular, the flushing hydraulic fluid device 7, especially the hydraulic fluid tank 17, the feed pump 22, the drive pump 23, the first drive cylinder 3 and the second drive cylinder 4, especially by means of the rocker connection 16, the first directional valve 5 and the second directional valve 6 and / or the flushing hydraulic fluid device 7, especially the hydraulic fluid tank 17, form a drive circuit for hydraulic fluid HF.

[0059] Furthermore, in the illustrated embodiment, the first directional control valve 5 and the second directional control valve 6 are integrated into a single, in particular common, valve or control block. In alternative embodiments, the first directional control valve and the second directional control valve may or may not be integrated into a valve block.

[0060] In Fig. 3 The valve block is separate from the first drive cylinder 3 and the second drive cylinder 4.

[0061] In Fig. 4 The valve block, the first drive cylinder 3, and the second drive cylinder 4 are integrated. In other words, the first directional control valve 5 and the second directional control valve 6 are integrated into a connection block directly on the first drive cylinder 3 and the second drive cylinder 4. This eliminates the need for connecting lines and an additional block. Specifically, all bores are integrated directly into the "large connection block" on the first drive cylinder 3 and the second drive cylinder 4. There is, in particular, only one external connection, leading to the hydraulic fluid purging device 7, specifically the hydraulic fluid tank 17 and / or the hydraulic fluid cooler 18 and / or the hydraulic fluid cleaner 19.

[0062] Fig. 1 bis 4 Figure 2 shows the construction and / or viscous material pumping system 2 according to the invention. The construction and / or viscous material pumping system 2 comprises a construction and / or viscous material conveying system 30 and the hydraulic drive system 1. The construction and / or viscous material conveying system 30 is designed for conveying, in particular conveying, construction and / or viscous material. The hydraulic drive system 1 is designed for driving, in particular driving, the construction and / or viscous material conveying system 30.

[0063] In detail, the construction and / or high-density material conveying system 30 comprises a first conveying cylinder and a second conveying cylinder, as well as a first conveying piston and a second conveying piston. The first conveying piston is located in the first conveying cylinder. The second conveying piston is located in the second conveying cylinder. The first piston rod 13 is attached to the first conveying piston for coupling its movement with the first drive piston 11. The second piston rod 14 is attached to the second conveying piston for coupling its movement with the second drive piston 12.

[0064] Furthermore, with regard to the hydraulic drive system 1, the construction and / or viscous material pumping system 2 and / or the construction and / or viscous material conveying system 30, reference is made to the technical literature.

[0065] Fig. 1Figure 1 shows a method according to the invention for operating the hydraulic drive system 1 and / or the construction and / or high-viscosity pump system 2. The method comprises: switching the first directional control valve 5 to the first switching position 5S1 or the second switching position 5S2 and the second directional control valve 6 to the first switching position 6S1 or the second switching position 6S2, in particular for the alternating flushing function WAF, the flushing hydraulic fluid shutdown function AHAF or the cylinder locking function ZSF, in particular by means of the control device 20.

[0066] Furthermore, the control device 20 has a connection, in particular an electrical connection, in particular a switching or signal connection, with the first directional valve 5 and / or the second directional valve 6 and / or the at least one sensor 21 and / or the feed pump 22 and / or the drive pump 23, in particular each.

[0067] As the illustrated and previously mentioned embodiments make clear, the invention provides an advantageous hydraulic drive system for a construction and / or viscous material pumping system, an advantageous construction and / or viscous material pumping system comprising such a hydraulic drive system, and an advantageous method for operating such a hydraulic drive system and / or such a construction and / or viscous material pumping system, each of which has improved properties.

Claims

1. A hydraulic drive system (1) for a construction and / or thick matter pump system (2), - wherein the hydraulic drive system (1) has a first drive cylinder (3) and a second drive cylinder (4), - a first directional control valve (5) and a second directional control valve (6), and - a flushing hydraulic fluid device (7), - wherein the first directional control valve (5) is configured by a first switching position (5S1) for connecting the first drive cylinder (3) to the second directional control valve (6), - characterized in that the first directional control valve (5) is configured by a second switching position (5S2) for connecting the second directional control valve (6) to the flushing hydraulic fluid device (7), and - wherein the second directional control valve (6) is configured by a first switching position (6S1) for connecting the second drive cylinder (4) to the first directional control valve (5) and a second switching position (6S2) for connecting the first directional control valve (5) to the flushing hydraulic fluid device (7).

2. The hydraulic drive system (1) as claimed in the preceding claim, - wherein the first directional control valve (5) is configured by the first switching position (5S1) not for connecting the first drive cylinder (3) to the flushing hydraulic fluid device (7) and not for connecting the second directional control valve (6) to the flushing hydraulic fluid device (7) and / or the second switching position (5S2) not for connecting the first drive cylinder (3) to the second directional control valve (6) and not for connecting the first drive cylinder (3) to the flushing hydraulic fluid device (7), and / or - wherein the second directional control valve (6) is configured by the first switching position (6S1) not for connecting the second drive cylinder (4) to the flushing hydraulic fluid device (7) and not for connecting the first directional control valve (5) to the flushing hydraulic fluid device (7) and / or the second switching position (6S2) not for connecting the second drive cylinder (4) to the first directional control valve (5) and not for connecting the second drive cylinder (4) to the flushing hydraulic fluid device (7).

3. The hydraulic drive system (1) as claimed in either of the preceding claims, - wherein a first cylinder port (51) of the first directional control valve (5) is connected to the first drive cylinder (3), and wherein a second cylinder port (61) of the second directional control valve (6) is connected to the second drive cylinder (4), - wherein a first flushing port (52) of the first directional control valve (5) is connected to the flushing hydraulic fluid device (7), and wherein a second flushing port (62) of the second directional control valve (6) is connected to the flushing hydraulic fluid device (7), and - wherein a first valve port (53) of the first directional control valve (5) and a second valve port (63) of the second directional control valve (6) are connected to each other, - wherein the first directional control valve (5) is configured by the first switching position (5S1) for connecting the first cylinder port (51) to the first valve port (53) and the second switching position (5S2) for connecting the first valve port (53) to the first flushing port (52), and - wherein the second directional control valve (6) is configured by the first switching position (6S1) for connecting the second cylinder port (61) to the second valve port (63) and the second switching position (6S2) for connecting the second valve port (63) to the second flushing port (62).

4. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the first directional control valve (5) is a first at least 3 / at least 2-way directional control valve (5'), in particular a first 4 / 2-way directional control valve (5''), in particular having a first unused port (54), and / or - wherein the second directional control valve (6) is a second at least 3 / at least 2-way directional control valve (6'), in particular a second 4 / 2-way directional control valve (6''), in particular having a second unused port (64).

5. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the first directional control valve (5) is a first cartridge valve (5''') and / or a first unit-type valve (5''''), and / or - wherein the second directional control valve (6) is a second cartridge valve (6‴) and / or a second unit-type valve (6ʺʺ).

6. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the first directional control valve (5) and / or the second directional control valve (6) are / is configured to be electrically switchable, in particular wherein the first directional control valve (5) and / or the second directional control valve (6) are / is configured to switch independently unenergized into the second switching position (5S2, 6S2) .

7. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the first directional control valve (5) is configured by the first switching position (5S1) for connecting a side (3S), in particular a bottom side (3BS), of the first drive cylinder (3) to the second directional control valve (6), and - wherein the second directional control valve (6) is configured by the first switching position (6S1) for connecting a side (4S), which is identical to the side (3S) of the first drive cylinder (3), in particular a bottom side (4BS), of the second drive cylinder (4) to the first directional control valve (5).

8. The hydraulic drive system (1) as claimed in any one of the preceding claims, wherein the hydraulic drive system (1) has: - a first drive piston (11) and a second drive piston (12), wherein the first drive piston (11) is arranged in the first drive cylinder (3), and wherein the second drive piston (12) is arranged in the second drive cylinder (4), - a first piston rod (13) and a second piston rod (14), wherein the first piston rod (13) is fastened to the first drive piston (11), and wherein the second piston rod (14) is fastened to the second drive piston (12), and - at least one water tank (15), wherein the first piston rod (13) and the second piston rod (14) are guided through the at least one water tank (15).

9. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the hydraulic drive system (1) has an oscillation connection (16), wherein the oscillation connection (16) connects the first drive cylinder (3) and the second drive cylinder (4) to each other.

10. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the flushing hydraulic fluid device (7) has a hydraulic fluid tank (17), in particular and a hydraulic fluid cooler (18) and / or a hydraulic fluid cleaner (19).

11. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the first directional control valve (3) and the second directional control valve (4) are switchable independently of each other.

12. The hydraulic drive system (1) as claimed in any one of the preceding claims, - wherein the hydraulic drive system (1) has a control device (20), wherein the control device (20) is configured for switching the first directional control valve (5) into the first switching position (5S1) and / or the second switching position and the second directional control valve (6) into the first switching position (6S1) and / or into the second switching position, in particular for an alternating flushing function (WAF), a flushing hydraulic fluid shut-off function (AHAF) and / or a cylinder lock function (ZSF).

13. The hydraulic drive system (1) as claimed in the preceding claim, - wherein the hydraulic drive system (1) has at least one sensor (21), wherein the at least one sensor (21) is configured for detecting a temperature (T) or a temperature variable, which is dependent on the temperature, and / or a degree of contamination (VG) or a degree of contamination variable, which is dependent on the degree of contamination, of the hydraulic drive system (1) and / or hydraulic fluid (HF), and - wherein the control device (20) is configured for switching, in particular for the alternating flushing function (WAF), depending on the detected temperature (T) or the detected temperature variable and / or the detected degree of contamination (VG) or the detected degree of contamination variable.

14. A construction and / or thick matter pump system (2), having: - a construction and / or thick matter conveying system (30), wherein the construction and / or thick matter conveying system (30) is configured for conveying construction and / or thick matter (BDS), and - a hydraulic drive system (1) as claimed in any one of the preceding claims, wherein the hydraulic drive system (1) is configured for driving the construction and / or thick matter conveying system (30) .

15. A method for operating a hydraulic drive system (1) as claimed in any one of claims 1 to 13 and / or a construction and / or thick matter pump system (2) as claimed in claim 14, wherein the method comprises: - switching the first directional control valve (5) into the first switching position (5S1) or the second switching position (5S2) and the second directional control valve (6) into the first switching position (6S1) or the second switching position (6S2), in particular for an alternating flushing function (WAF), a flushing hydraulic fluid shut-off function (AHAF) or a cylinder lock function (ZSF) .

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