Hydraulic systems, building materials and / or high-viscosity material pumps and methods

Abstract

The present invention relates to a hydraulic system (1) for driving a building materials and / or high viscosity material pump (50), the hydraulic system (1) comprising a supply pressure section (3) and a low pressure section (4) for a hydraulic fluid (L), a controllable low-pressure relief valve device (5) for variable adjustment of the low pressure (N) range of the hydraulic fluid (L) in the low-pressure section (4), a controllable supply pressure relief valve device (6) for variable adjustment of the supply pressure (S) range of the hydraulic fluid (L) in the supply pressure section (3), and a control device (7) designed to control the low-pressure relief valve device (5) and the supply pressure relief valve device (6) in conjunction such that the low-pressure relief valve device (5) adjusts the low pressure range and the supply pressure relief valve device (6) adjusts the supply pressure range in an interdependent manner.

Description

Technical Field

[0001] The present invention relates to a hydraulic system for driving a building material and / or a high-viscosity material pump. The present invention also relates to such a building material and / or high-viscosity material pump. Further, the present invention relates to a method for operating such a building material and / or high-viscosity material pump.

Summary of the Invention

Problems to be Solved by the Invention

[0002] The problem of the present invention is to provide a hydraulic system for driving a building material and / or a high-viscosity material pump with improved characteristics, such a building material and / or high-viscosity material pump, and a method for operating such a building material and / or high-viscosity material pump.

[0003] This problem is solved by the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims.

[0004] The hydraulic system according to the present invention is used to drive a pump for building materials and / or high-viscosity materials. The pump for building materials and / or high-viscosity materials can be driven by the hydraulic system to transport building materials and / or high-viscosity materials. In this case, the hydraulic system comprises a supply pressure section and a low-pressure section for the hydraulic fluid, respectively. Furthermore, the hydraulic system comprises a controllable pressure relief valve device designed to variably adjust the low-pressure range of the hydraulic fluid in the low-pressure section. The hydraulic system further comprises a control device, which is designed to control the low-pressure relief valve device and the supply pressure relief valve device in conjunction. In this case, the control device is designed to control the low-pressure relief valve device and the supply pressure relief valve device in conjunction so that the low-pressure relief valve device controls the low-pressure range, particularly the dominant low pressure within the low-pressure range, and the supply pressure relief valve device controls the supply pressure range, particularly the dominant supply pressure within the supply pressure range, in an interdependent manner. The hydraulic system may have a closed hydraulic circuit for the hydraulic fluid, which includes a supply pressure section and a low-pressure section. For the sake of purposes, the hydraulic circuit of the hydraulic system has at least one hydraulic line, particularly a pipe and / or hose. The low-pressure relief valve device and the supply pressure relief valve device can be connected to each other so that they are controlled in conjunction. For the sake of purposes, at least one of the low-pressure relief valve device and the supply pressure relief valve device may be electrically and / or hydraulically controllable by the control device. Advantageously, the hydraulic system allows for the adaptation of supply pressure and / or low pressure as needed to enable particularly energy-saving driving of building material and / or high-viscosity material pumps. In particular, in order to reduce power loss and, consequently, minimize the energy consumption of building material and / or high-viscosity material pumps, the supply pressure and / or low pressure can be reduced by appropriately adjusting the low pressure range and / or supply pressure range using a hydraulic system.

[0005] Purposefully, low-pressure relief valve devices are designed for automatic and / or closed-loop controllable adjustment of the low-pressure range, particularly during the operation of hydraulic systems, especially when driving pumps for building materials and / or high-viscosity materials. Alternatively or additionally, supply-pressure relief valve devices are also designed for purposefully, particularly during the operation of hydraulic systems, especially when driving pumps for building materials and / or high-viscosity materials, for automatic and / or closed-loop controllable adjustment of the supply-pressure range.

[0006] The hydraulic system according to the present invention can, advantageously, allow for adaptive adjustment, particularly reduction, of the upper limits of the low pressure range and / or supply pressure range as needed. The supply pump of the hydraulic system can overcome and / or act against the upper limit of the supply pressure range in order to supply hydraulic fluid having a supply pressure to the supply pressure section. In this way, a reduction in the energy consumption of the supply pump as needed, particularly the energy consumption of the supply pump, can be achieved, which can have a favorable effect on the energy consumption of the hydraulic system. The supply pressure can be generated by the supply pump of the hydraulic system. That is, the supply pump can be configured to supply hydraulic fluid to the hydraulic system. The supply pressure range is, for example, 8 to 40 bar, particularly 8 to 34 bar.

[0007] The term "configured" can be used synonymously with the term "designed."

[0008] The terms "to prepare" or "to have" can be used synonymously with the term "to possess."

[0009] In this context, "to control" can mean "to control open-loop (steuern)" and / or "to control closed-loop (regeln)".

[0010] Building materials may include, and may be particularly, building bulk materials such as mortar, cement, screed, concrete, plaster, and / or sand, gravel, and / or crushed stone. Additionally or alternatively, high-viscosity materials may include, and may be particularly, slurries.

[0011] A hydraulic system may have a container, in particular a tank, for storing the hydraulic fluid. A supply pump may be designed to supply the hydraulic fluid from the container to a supply pressure section. Additionally or alternatively, the supply pump may be a constant flow pump. Additionally or alternatively, the supply pump may be designed to supply the supply pressure section directly and / or indirectly.

[0012] In embodiments of the present invention, the control device is designed to control a low-pressure relief valve device and a supply-pressure relief valve device in conjunction based on at least one operating parameter of the hydraulic system and / or hydraulic fluid. In this case, the at least one operating parameter may be the drive state, drive flow rate, drive pressure and / or drive speed. In particular, the drive state may be an active, i.e., driven state, or an inactive, i.e., undriven state, especially for building materials and / or high-viscosity material pumps. Additionally or alternatively, the drive flow rate and / or drive pressure may each have a value or quantity, in particular a variable value or quantity, and / or may be an operating parameter of the hydraulic fluid. Further additionally or alternatively, the drive speed may have a value or quantity, in particular a variable value or quantity, and / or may be an operating parameter of the supply pump and / or drive motor, to the extent that it exists. The drive pressure (Arbeitsdruck), which can also be called "high pressure" in comparison to low pressure, is, for example, 0 to 1000 bar, particularly 0 to 400 bar.

[0013] In embodiments of the present invention, a low-pressure relief valve device and a supply-pressure relief valve device are hydraulically controlled in conjunction, and in particular, pilot-controlled. In this case, the control device has an electrically controllable check valve device, in particular a single electrically controllable check valve device. The check valve device is designed to hydraulically control the low-pressure relief valve device and the supply-pressure relief valve device in conjunction, and in particular to be pilot-controlled. The electrically controllable check valve device can be a pilot valve device. The check valve device can be in fluid communication with a hydraulic control line, and the low-pressure relief valve device and the supply-pressure relief valve device are in fluid communication with each other via the same control line.

[0014] In embodiments of the present invention, the low pressure range is from a minimum of 2.5 bar, particularly from a minimum of 5 bar, particularly from a minimum of 10 bar, particularly from a minimum of 15 bar to a maximum of 40 bar, particularly up to a maximum of 35 bar, particularly up to a maximum of 30 bar, and particularly up to a maximum of 25 bar. Thus, the low pressure range and the supply pressure range can be adjusted relative to each other such that the low pressure is, for example, 1 to 4 bar lower than the supply pressure.

[0015] In another embodiment of the present invention, the low-pressure relief valve device has a controllable proportional pressure relief valve designed to continuously adjust the low-pressure range. In particular, the proportional pressure relief valve of the low-pressure relief valve device is designed to automatically adjust the low-pressure range. In particular, the proportional pressure relief valve of the low-pressure relief valve device is controllable by a control device. Alternatively or additionally, the supply pressure relief valve device has a controllable proportional pressure relief valve designed to continuously adjust the supply pressure range. In particular, the proportional pressure relief valve of the supply pressure relief valve device is designed to automatically adjust the supply pressure range. In particular, the proportional pressure relief valve of the supply pressure relief valve device is controllable by a control device.

[0016] For practical purposes, the proportional pressure relief valve in a low-pressure relief valve device and / or supply-pressure relief valve device may be a proportional pressure control valve and / or may be called a proportional pressure control valve.

[0017] In another embodiment of the present invention, the hydraulic system has a variable-adjustable drive pump, in particular an adjustable drive pump. The drive pump is designed to generate a variable drive flow rate having a variable drive pressure of a hydraulic fluid in at least one drive pressure section of the hydraulic system. Furthermore, the hydraulic system has at least one hydraulic actuator (Stellglied) designed to variablely adjust the drive pump by a variable operating pressure (Stelldruck) of the hydraulic fluid. In this case, the supply pressure section is designed to hydraulically supply the hydraulic fluid to the at least one actuator having an adjusted supply pressure for the operating pressure. In this case, the control device is designed to control the at least one actuator, in particular based on at least one operating parameter, so that the at least one actuator adjusts, in particular variable adjusts, the drive pump to generate a variable drive flow rate having a variable drive pressure of a hydraulic fluid in at least one drive pressure section.

[0018] In particular, the drive pressure section may be different from the supply pressure section. Specifically, the supply pressure section can be designed to supply hydraulic fluid into the drive pressure section by at least one supply check valve of the hydraulic system. Thus, the supply pump can be designed to supply into the drive pressure section indirectly, i.e., not directly.

[0019] In another embodiment of the present invention, the drive pump is an axial piston pump having a variable adjustable swash plate. In this case, at least one actuator is designed to variably adjust the swash plate. In particular, the axial piston pump has a variable adjustable, especially adjustable, displacement volume (Schluckvolumen). In this case, the actuator can be designed to variably adjust, especially automatically adjust, the displacement volume. In particular, the swivel angle of the swash plate can be based on an operating parameter. In particular, a control device can be designed to determine and / or detect and / or calculate, especially its value, based on at least one operating parameter.

[0020] In another embodiment of the present invention, the hydraulic system comprises at least one drive cylinder and one assigned drive piston, in particular a drive piston moved within the drive cylinder. In this case, the drive pump is designed to generate a drive flow rate of hydraulic fluid, in particular by the variable motion of at least one drive piston within the drive cylinder. In particular, the hydraulic system may have at least one pump line. The drive pump and the drive cylinder can be connected by a pump line for the flow of hydraulic fluid, in particular for the flow of hydraulic fluid between the drive pump and the drive cylinder. Additionally or alternatively, the drive piston can be designed to be pressurized with hydraulic fluid. Further additionally or alternatively, the control device can be designed to control the movement of the drive piston, in particular to be automatically controlled, based on at least one operating parameter.

[0021] In another embodiment of the present invention, the hydraulic system comprises at least two drive cylinders and at least two assigned drive pistons, in particular drive pistons moved within each drive cylinder. Furthermore, the hydraulic system has an oscillating line (Schaukelleitung) for the hydraulic fluid. The drive pump and the two drive cylinders can form a closed drive circuit for the hydraulic fluid by the oscillating line. The two drive pistons are connected by the oscillating line, in particular in opposite phases. In particular, the two drive cylinders can be connected by the oscillating line for the flow of hydraulic fluid, in particular for the flow of hydraulic fluid between the drive cylinders. Additionally or alternatively, the hydraulic system may have at least two pump lines. The drive pump and the two drive cylinders can form a closed drive circuit for the hydraulic fluid by the oscillating line and the two pump lines. In particular, the drive pump and one of the two drive cylinders can be connected by one of the two pump lines for the flow of hydraulic fluid, in particular for the flow of hydraulic fluid between the drive pump and the drive cylinder. A drive pump and the other of two drive cylinders can be connected by the other of two pump lines for the flow of hydraulic fluid, particularly for the flow of hydraulic fluid between the drive pump and the drive cylinder. Further or alternatively, a drive pump or closed drive circuit may have a high-pressure side and a low-pressure side, particularly during the operation of a hydraulic system, particularly when driving pumps for building materials and / or high-viscosity materials. In particular, the drive pressure, especially the drive pressure on the high-pressure side, can be called high pressure, as described above. Low pressure can be generated or produced by the supply pump. The drive pressure or high pressure or its value can be greater than the low pressure or its value. In particular, a “closed drive circuit” can represent the flow of hydraulic fluid from the drive pump, especially its high-pressure side, through one pump connection, one drive cylinder, a oscillating connection, another drive cylinder, another pump connection, to the drive pump, especially its low-pressure side.

[0022] In another embodiment of the present invention, a low-pressure relief valve device is designed to push the hydraulic fluid out of the low-pressure section by variably adjusting the low-pressure range. Alternatively or additionally, a supply-pressure relief valve device is designed to push the hydraulic fluid out of the supply-pressure section by variably adjusting the supply-pressure range. In particular, the hydraulic fluid can be pushed out to prevent the low-pressure range and / or supply-pressure range from deviating from the upper limit of the low-pressure range and / or supply-pressure range.

[0023] In another embodiment of the present invention, the hydraulic system comprises at least one measuring sensor designed to measure at least one characteristic of the hydraulic system and / or hydraulic fluid, in particular pressure. In this case, the control device is designed to determine at least one operating parameter based on the measured characteristic.

[0024] The building materials and / or high-viscosity material pump according to the present invention comprises a building materials and / or high-viscosity material conveying device. The building materials and / or high-viscosity material conveying device is designed to convey building materials and / or high-viscosity materials. Furthermore, the building materials and / or high-viscosity material pump comprises a hydraulic system according to the present invention as described above. In this case, the hydraulic system is designed to drive the building materials and / or high-viscosity material conveying device. The advantages of the hydraulic system according to the present invention described above also apply to the building materials and / or high-viscosity material pump according to the present invention equipped with such a hydraulic system.

[0025] Purposefully, building material and / or high viscosity material pumps can be designed as mobile devices, particularly as building material and / or high viscosity material pump trucks.

[0026] The method according to the present invention is used to operate the building material and / or high viscosity material pump according to the present invention as described above. That is, the building material and / or high viscosity material pump according to the present invention can be operated according to the method according to the present invention. The method includes step a) changing the drive flow rate and / or drive pressure of the hydraulic fluid in the drive pressure section of the hydraulic system, in particular by adjusting the variable adjustable drive pump of the hydraulic system. The method further includes step b) adjusting the upper limit of the low pressure range to a predetermined maximum value if the rate of change over time of the drive flow rate and / or drive pressure is greater than a predetermined threshold. Furthermore, the method includes step c) lowering the upper limit of the low pressure range if the rate of change over time of the drive flow rate and / or drive pressure is less than or equal to a predetermined threshold. In this way, the low pressure can be variably adjusted to a particularly energy-saving level during the operation of the building material and / or high viscosity material pump.

[0027] In certain embodiments of the present invention, particularly in embodiments of the method according to the present invention, the drive flow rate is oscillatingly varied, especially by zero crossing. This can allow for the adjustment of two drive pistons in the associated drive cylinder of a building material and / or high viscosity material pump in opposite phases.

[0028] In particular, building materials and / or high-viscosity material pumps, especially building materials and / or high-viscosity materials, can have at least one conveying parameter, especially a variable conveying parameter, especially a delivery parameter including a value or quantity. In particular, at least one delivery parameter can be a delivery state, a delivery flow rate, and / or a delivery pressure. Additionally or alternatively, at least one operating parameter can depend on at least one delivery parameter, and / or, in order to achieve the delivery parameter, especially the delivery parameter desired by the user, it needs to have a predetermined or necessary value. In particular, as long as it exists, the drive state can depend on the delivery state, the drive flow rate can depend on the delivery flow rate, and / or the drive pressure can depend on the delivery pressure. In other words, the control unit can be designed to determine, or detect, especially calculate, especially automatically determine, or detect, especially calculate at least one operating parameter or its value based on at least one delivery parameter. Further additionally or alternatively, the control unit can have an operating panel for operating a building material and / or high-viscosity material pump or a hydraulic system, especially an input device for user input of at least one delivery parameter or its value, or user selection.

[0029] Other advantages and features of the present invention will become apparent from the claims and from the following description of the preferred exemplary embodiments of the present invention based on the drawings. In that case, the same reference numerals refer to the same or similar, or functionally identical components.

[0030] Needless to say, the above-described features and the features described below can be used not only in the described combinations but also in other combinations or alone without departing from the scope of the present invention.

Brief Description of the Drawings

[0031] [Figure 1]This single figure schematically shows a circuit diagram of one embodiment of a building materials and / or high-viscosity material pump according to the present invention, using one embodiment of the hydraulic system according to the present invention when performing a method for operating a building materials and / or high-viscosity material pump according to the present invention. [Modes for carrying out the invention]

[0032] The building materials and / or high-viscosity material pump 50 according to the present invention comprises a building materials and / or high-viscosity material conveying device 51. The building materials and / or high-viscosity material conveying device 51 is designed to convey building materials and / or high-viscosity materials. Furthermore, the building materials and / or high-viscosity material pump 50 comprises a hydraulic system 1 according to the present invention, which is designed to drive the building materials and / or high-viscosity material conveying device 51. By driving the building materials and / or high-viscosity material conveying device 51, the building materials and / or high-viscosity material pump 50 can be driven. Therefore, the hydraulic system 1 is designed to drive the building materials and / or high-viscosity material pump 50.

[0033] The hydraulic system 1 has a supply pressure section 3 and a low-pressure section 4 for the hydraulic fluid L. The supply pressure section 3 and the low-pressure section 4 can be components of the hydraulic circuit for the hydraulic fluid L of the hydraulic system 1, in particular a closed hydraulic circuit.

[0034] The hydraulic system 1 further comprises a controllable low-pressure relief valve device 5. The controllable low-pressure relief valve device 5 is used to variably adjust the low-pressure range of the low-pressure N of the hydraulic fluid L in the low-pressure section 4.

[0035] Furthermore, the hydraulic system 1 has a controllable supply pressure relief valve device 6. The controllable supply pressure relief valve device 6 is used to variably adjust the supply pressure range of the supply pressure S of the hydraulic fluid L in the supply pressure section 3.

[0036] Furthermore, the hydraulic system 1 includes a control device 7. In this case, the control device 7 is designed to control the low-pressure relief valve device 5 and the supply pressure relief valve device 6 in coordination so that they mutually adjust the low-pressure range and the supply pressure relief valve device 6 adjust the supply pressure range, respectively. The low-pressure relief valve device 5 and the supply pressure relief valve device 6 can be connected to each other so that they are controlled in coordination.

[0037] The hydraulic system 1 here has a supply pump 19 designed to supply hydraulic fluid at supply pressure S to the supply pressure section 3. Furthermore, the hydraulic system 1 here includes a reservoir 20 for the hydraulic fluid L, in particular a storage container or tank. The supply pump 19 may be able to receive the hydraulic fluid L from the reservoir 20. The hydraulic system 1 has a supply check valve 21 that can connect the supply pressure section 3 to the low-pressure section 4 in a fluid-communicative manner, particularly in a unidirectional manner. Furthermore, the hydraulic system 1 here has a switching flushing valve 22 to which the low-pressure section 4 is fluid-communicative. The switching flushing valve 22 may be designed to be controllable so as to connect the low-pressure section 4 to a low-pressure relief valve device 5 in a fluid-communicative manner.

[0038] The hydraulic system 1 has, for example, a cock 23 which can be used to adjust, in particular to shut off, the supply of hydraulic fluid L to the oscillating oil feed valve (Schaukeloelabspeiseventil) 24 of the hydraulic system 1. Furthermore, the hydraulic system 1 here has an oscillating oil feed throttle 25 which can be supplied with hydraulic fluid L using another oscillating oil feed valve 24. Furthermore, the hydraulic system 1 here has a flush line 26 which may be a component of the low-pressure section 4, a flush line designed to connect the low-pressure section 4 to a switching flushing valve 22 in a fluid communication manner.

[0039] Furthermore, the hydraulic system 1 has control lines 27 for controlling the switching flushing valve 22, the low-pressure relief valve device 5, and the supply-pressure relief valve device 6, respectively. For example, the hydraulic system 1 has an operating pressure line (Stelldruckleitung) 28 for controlling the actuator 13 of the hydraulic system 1. Here, the hydraulic system 1 has two control lines, in particular the hydraulic control line 27, for controlling the switching flushing valve 22, especially for automatic control.

[0040] For example, the control device 7 is designed to control the low-pressure relief valve device 5 and the supply pressure relief valve device 6 in coordination based on at least one operating parameter B of the hydraulic system 1. Alternatively or additionally, the control device 7 is designed to control the low-pressure relief valve device 5 and the supply pressure relief valve device 6 in coordination based on at least one operating parameter B of the hydraulic fluid L. In this case, the at least one operating parameter B is, here, the drive state, drive flow rate, drive pressure A and / or drive rotational speed.

[0041] The supply pressure S can be generated by the supply pump 19 of the hydraulic system 1. The supply pump 19 is configured to supply the hydraulic fluid L to the hydraulic system 1. The supply pressure range of the supply pressure S is, for example, 8 to 40 bar, and especially 8 to 34 bar. The drive pressure A, which can be called "high pressure" in comparison to the low pressure N, is, for example, 0 to 1000 bar, and especially 0 to 400 bar. The low pressure N can be 1 to 4 bar lower than the supply pressure S. For example, the lower limit of the low pressure range is 2.5 bar, especially 5 bar, especially 10 bar, and especially 15 bar. The upper limit of the low pressure range can be, for example, 40 bar, especially 35 bar, especially 30 bar, and especially 25 bar.

[0042] For example, the low-pressure relief valve device 5 and the supply pressure relief valve device 6 can be controlled in a hydraulic linked manner. Here, the low-pressure relief valve device 5 and the supply pressure relief valve device 6 can be pilot-controlled in a hydraulic linked manner. In that case, the control device 7 has, for example, an electrically controllable check valve device 8. Here, the control device 7 has a single electrically controllable check valve device 8. The check valve device 8 is designed, for example, to control the low-pressure relief valve device 5 and the supply pressure relief valve device 6 in a hydraulic linked manner. Here, the check valve device 8 is designed to pilot-control the low-pressure relief valve device 5 and the supply pressure relief valve device 6 in a hydraulic linked manner.

[0043] The electrically controllable check valve device 8 can be a pilot-controlled valve device. The check valve device 8 is fluid-communicated with one of the control lines 27, and the low-pressure relief valve device 5 and the supply-pressure relief valve device 6 are fluid-communicated with each other via the same control line 7.

[0044] The low-pressure relief valve device 5 here has a controllable proportional pressure relief valve 9. The controllable proportional pressure relief valve 9 of the low-pressure relief valve device 5 is designed, for example, to continuously adjust the low-pressure value range. Alternatively or additionally, the supply pressure relief valve device 6 has a controllable, in particular another proportional pressure relief valve 10, as here. The controllable proportional pressure relief valve 10 of the supply pressure relief valve device 6 is designed, for example, to continuously adjust the supply pressure value range.

[0045] The hydraulic system 1 includes, for example, a variable-adjustable drive pump 11. The variable-adjustable drive pump 11 is designed to generate a variable drive flow rate having a variable drive pressure A of the hydraulic fluid L in at least one drive pressure section 12 of the hydraulic system 1. The hydraulic system 1 also includes, for example, at least one hydraulic actuator 13, which is designed to variably adjust the drive pump 11 by a variable operating pressure of the hydraulic fluid L. Here, there are two such hydraulic actuators 13. In this case, the supply pressure section 3 is designed to hydraulically supply the hydraulic fluid L to at least one actuator 13 having a regulated supply pressure S for the operating pressure. The control device 7 is designed to control at least one actuator 13 so that at least one actuator 13 adjusts the drive pump 11 to generate a variable drive flow rate having a variable drive pressure A of the hydraulic fluid L in at least one drive pressure section 12. Here, the control device 7 is designed to control at least one actuator 13 based on at least one operating parameter B.

[0046] The drive pump 11 is, in this case, an axial piston pump 14 having a variably adjustable swash plate. In this case, at least one actuator 13 is designed, for example, to variably adjust the swash plate.

[0047] The hydraulic system 1 has, for example, at least one drive cylinder 15 and one assigned drive piston 16. In this case, the drive pump 11 is designed to generate a drive flow rate of the hydraulic fluid L by the variable motion of at least one drive piston 16. Here, the hydraulic system 1 has two drive cylinders 15 and each assigned drive piston 16, which are connected to each other via a swing line 17 for the hydraulic fluid L.

[0048] For example, the low-pressure relief valve device 5 is designed to push the hydraulic fluid L out of the low-pressure section 4 by variably adjusting the low-pressure range. Alternatively or additionally, the supply-pressure relief valve device 6 is designed to push the hydraulic fluid L out of the supply-pressure section 3 by variably adjusting the supply-pressure range, as shown here.

[0049] The hydraulic system 1 may be equipped with at least one measuring sensor 18, which is designed to measure at least one characteristic of the hydraulic system 1, in particular pressure, and alternatively or additionally, at least one characteristic of the hydraulic fluid L, in particular pressure. In this case, the control device 7 is designed to determine at least one operating parameter B based on the measured characteristics. In this way, closed-loop control of the low-pressure relief valve device 5 and / or the supply-pressure relief valve device 6 can be achieved by feeding back the measured characteristics via the operating parameter B determined therefrom.

[0050] A building materials and / or high-viscosity material pump 50 operates in accordance with the method according to the present invention. The method includes step a) of varying the drive flow rate of the hydraulic fluid L in the drive pressure section 12 of the hydraulic system 1 and, alternatively or additionally, the drive pressure A. Here, the drive flow rate and, alternatively or additionally, the drive pressure A in the drive pressure section 12 are varied by adjusting a variable adjustable drive pump 11. The method further includes step b) of adjusting the upper limit of the low pressure range to a predetermined maximum value if the rate of change over time of the drive flow rate and, alternatively or additionally, the drive pressure A, particularly the first time derivative, is greater than a predetermined threshold. The method further includes step c) of lowering the upper limit of the low pressure range if the rate of change over time of the drive flow rate and / or the drive pressure A is less than or equal to a predetermined threshold. In this case, the drive flow rate may fluctuate oscillatingly by zero crossing, for example, as here.

[0051] The drive pump 11 has, for example, a high-pressure side and a low-pressure side, which alternate periodically during the operation of the hydraulic system 1 and / or the building materials and / or high-viscosity material pump 50. The drive pressure A is, for example, higher than the upper limit of the low-pressure value range. In Figure 1, when the high-pressure side is at the top, the low-pressure side is at the bottom, and vice versa. This is indicated by a slash between reference numeral N and reference numeral A. When the high-pressure side is at the top in Figure 1, the hydraulic fluid L having the drive pressure A flows from the drive pump 11 to the drive cylinder 15 shown at the bottom of Figure 1. In this case, the hydraulic connection between the drive pump 11 and the drive cylinder 15 shown at the bottom of Figure 1 forms a drive pressure section 12, or at least partially. This allows the drive piston 16 shown at the bottom of Figure 1 to move to the right. The hydraulic fluid L, in particular the hydraulic fluid having an oscillating pressure, flows from the drive cylinder 15 shown at the bottom of Figure 1 through the oscillating line 17 to the drive cylinder 15 shown at the top of Figure 1. In this case, the oscillating line 17 and the drive cylinder 15 form an oscillating pressure section, which can be formed at least partially. Thus, the drive piston 16 shown at the top of Figure 1 can be moved to the left in Figure 1. A hydraulic fluid L having a low pressure N flows from the drive cylinder 15 shown at the top of Figure 1 to the drive pump 11. In this case, the connection between the drive pump 11 and the drive cylinder 15 shown at the top of Figure 1 forms a low-pressure section 4, which can be formed at least partially. In this case, the supply pressure section 3 is supplied to the low-pressure section 4 by the supply check valve 21 shown at the top of Figure 1.

[0052] When the drive piston 16 reaches its terminal position, the high-pressure and low-pressure sides of the drive pump 11 are swapped. In this case, the high-pressure side is at the top and the low-pressure side is at the bottom in Figure 1. Therefore, the drive piston 16 shown at the bottom of Figure 1 moves to the left, and the drive piston 16 shown at the top moves to the right.

[0053] For example, the hydraulic fluid L can be pushed out of the hydraulic system 1, particularly into the reservoir 20, by the low-pressure relief valve device 5 and / or the supply-pressure relief valve device 6.

[0054] For example, a portion of the hydraulic fluid L flows from the supply pressure section 3 into the low-pressure section 4. Another portion of the hydraulic fluid L can be pushed out from the supply pressure section 3.

[0055] For example, a portion of the hydraulic fluid L exits the low-pressure section 4 and flows to the drive pump 11. Another portion of the hydraulic fluid L can be pushed out of the low-pressure section 4.

[0056] The low-pressure section 4 and the low-pressure relief valve device 5 are connected here by a switching flushing valve 22 for the flow of the hydraulic fluid L. When the low-pressure section 4 is positioned above in Figure 1, the hydraulic fluid L can flow from the low-pressure section 4 through the switching flushing valve 22 to the low-pressure relief valve device 5.

[0057] For example, the hydraulic system 1 has two flush lines 26 for the hydraulic fluid L. The low-pressure section 4 and the drive-pressure section 12 are each connected to a switching flushing valve 5 via one of the flush lines 26. In this case, the switching flushing valve 5 is designed to connect, for example, a flush line 26 having a lower pressure compared to the other flush line 26 to the low-pressure relief valve device 5, in particular for the flow of the hydraulic fluid L from each flush line 26 to the low-pressure relief valve device 5.

[0058] The building materials and / or high-viscosity material conveying device 51 includes, for example, at least one, particularly two, dispensing cylinders and one, particularly two, assigned dispensing pistons, particularly dispensing pistons located within the dispensing cylinders. In particular, at least one dispensing cylinder is designed for building materials and / or high-viscosity materials. At least one dispensing cylinder may be designed to pressurize building materials and / or high-viscosity materials. The hydraulic system 1 may have at least one, particularly two, piston rods. At least one piston rod may be designed to motion-couple or transmit motion from at least one drive piston 16 to at least one dispensing piston. In particular, at least one piston rod is attached to at least one drive piston 16 or at least one dispensing piston. Furthermore, the building materials and / or high-viscosity material conveying device 51 may have a diverter system (Rohrweichensystem).

[0059] The building material and / or high-viscosity material conveying device 51 may have a dispensing cylinder including a variable-volume dispensing chamber. To change the volume of the dispensing chamber, in particular to change it in the reverse direction, each dispensing cylinder may have an adjustable dispensing piston. The building material and / or high-viscosity material conveying device 51 may further include an S-shaped diverter, particularly an S-pipe, one end of which is fluid-communicable to a discharge pipe that serves as a pump outlet for the building material and / or high-viscosity material. The diverter may be located in a storage chamber for storing the building material and / or high-viscosity material, into which the building material and / or high-viscosity material can be filled from above. In this case, the diverter may be rotatably mounted at one end to the discharge pipe within the storage chamber. The variable-volume dispensing chamber may lead into the storage chamber. The diverter may be rotatable within the storage chamber so as to be alternately connected to one of the dispensing chambers to deliver building material and / or high-viscosity material. In this way, the interaction between the rotation of the diverter and the volume change of the discharge chamber allows for the alternating process of drawing building materials and / or high-viscosity materials from the storage chamber into the discharge chamber and pumping them out through the diverter via the discharge chamber and then through the discharge pipe.

[0060] The present invention can provide an advantageous hydraulic system 1 for a building materials and / or high-viscosity material pump 50 having improved characteristics, particularly enabling energy or electricity savings, and an advantageous building materials and / or high-viscosity material pump 50 having such a hydraulic system 1.

Claims

1. A hydraulic system (1) for driving a pump (50) for building materials and / or high-viscosity materials, wherein the hydraulic system (1) A supply pressure section (3) and a low-pressure section (4) for the hydraulic fluid (L), A controllable low-pressure relief valve device (5) for variably adjusting the low-pressure range of the low pressure (N) of the hydraulic fluid (L) in the low-pressure section (4), A controllable supply pressure relief valve device (6) for variably adjusting the supply pressure range of the supply pressure (S) of the hydraulic fluid (L) in the supply pressure section (3), A control device (7) is designed to control the low-pressure relief valve device (5) and the supply pressure relief valve device (6) in coordination, such that the low-pressure relief valve device (5) adjusts the low-pressure range and the supply pressure relief valve device (6) adjusts the supply pressure range in an interdependent manner. A hydraulic system (1) equipped with the following:

2. The control device (7) is designed to control the low-pressure relief valve device (5) and the supply-pressure relief valve device (6) in coordination based on at least one operating parameter (B) of the hydraulic system (1) and / or the hydraulic fluid (L). In particular, the at least one operating parameter (B) is the drive state, drive flow rate, drive pressure (A), and / or drive rotation speed. The hydraulic system (1) according to claim 1.

3. The low-pressure relief valve device (5) and the supply-pressure relief valve device (6) can be controlled in conjunction using hydraulics, and are particularly pilot-controllable. The control device (7) has, in particular, a single, electrically controllable check valve device (8), which is designed to control the low-pressure relief valve device (5) and the supply-pressure relief valve device (6) in a hydraulically coordinated manner, and is particularly pilot-controlled. The hydraulic system (1) according to claim 1 or 2.

4. The aforementioned low-pressure range is from a minimum of 2.5 bar, particularly from a minimum of 5 bar, particularly from a minimum of 10 bar, particularly from a minimum of 15 bar, to a maximum of 40 bar, particularly up to a maximum of 35 bar, particularly up to a maximum of 30 bar, and particularly up to a maximum of 25 bar. A hydraulic system (1) according to any one of claims 1 to 3.

5. The low-pressure relief valve device (5) has a controllable proportional pressure relief valve (9) designed to continuously adjust the low-pressure range, and / or The supply pressure relief valve device (6) has a controllable proportional pressure relief valve (10) designed to continuously adjust the supply pressure range. A hydraulic system (1) according to any one of claims 1 to 4.

6. A variable adjustable drive pump (11) designed to generate a variable drive flow rate having a variable drive pressure (A) of a hydraulic fluid (L) in at least one drive pressure section (12) of the hydraulic system (1), The system comprises at least one hydraulic actuator (13) designed to variably adjust the drive pump (11) by a variable operating pressure of a hydraulic fluid (L), The supply pressure section (3) is designed to hydraulically supply a hydraulic fluid (L) having the adjusted supply pressure (S) for the operating pressure to the at least one actuator (13), The hydraulic system (1) according to any one of claims 1 to 5, wherein the control device (7) is designed to control the at least one actuator (13) on the basis of at least one operating parameter (B) in particular, such that the at least one actuator (13) adjusts the drive pump (11) to generate the variable drive flow rate having the variable drive pressure (A) of the hydraulic fluid (L) in the at least one drive pressure section (12).

7. The drive pump (11) is an axial piston pump (14) having a variably adjustable swash plate, The at least one actuator (13) is designed to variably adjust the swash plate. The hydraulic system (1) according to claim 6.

8. It comprises at least one drive cylinder (15) and one assigned drive piston (16), The drive pump (11) is designed to generate the drive flow rate of the hydraulic fluid (L) by the variable motion of at least one drive piston (16). The hydraulic system (1) according to claim 6 or 7.

9. At least two drive cylinders (15) and each assigned drive piston (16), Oscillating line (17) for hydraulic fluid (L) and Equipped with, The two drive pistons (16) are connected by the swing line (17). The hydraulic system (1) according to claim 8.

10. The low-pressure relief valve device (5) is designed to push the hydraulic fluid (L) out of the low-pressure section (4) by variably adjusting the low-pressure range, and / or The supply pressure relief valve device (6) is designed to push the hydraulic fluid (L) out of the supply pressure section (3) by variably adjusting the supply pressure range. A hydraulic system (1) according to any one of claims 1 to 9.

11. The hydraulic system (1) has at least one measuring sensor (18) designed to measure at least one characteristic of the hydraulic system (1) and / or the hydraulic fluid (L), in particular pressure, The control device (7) is designed to determine at least one operating parameter (B) based on the measured characteristics. A hydraulic system (1) according to any one of claims 1 to 10.

12. A pump for building materials and / or high-viscosity materials (50), A building materials and / or high-viscosity material transporting device (51) designed to transport building materials and / or high-viscosity materials, A pump for building materials and / or high-viscosity materials, comprising a hydraulic system (1) according to any one of claims 1 to 11, which is designed to drive the building material and / or high-viscosity material transport device (51).

13. A method for operating a building material and / or high viscosity material pump (50) according to claim 12, wherein the method is: a) A step of changing the drive flow rate and / or drive pressure (A) of the hydraulic fluid (L) in the drive pressure section (12) of the hydraulic system (1) by adjusting the variable adjustable drive pump (11) of the hydraulic system (1), b) If the rate of change over time of the drive flow rate and / or the drive pressure (A) is greater than a predetermined threshold, the upper limit of the low pressure range is adjusted to a predetermined maximum value; c) A method comprising the step of lowering the upper limit of the low pressure range if the rate of change over time of the drive flow rate and / or the drive pressure (A) is less than or equal to the predetermined threshold.

14. In particular, the drive flow rate fluctuates erratically due to zero crossing. The method according to claim 13.

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