阅读说明：本技术 用于建筑材料泵的液压驱动系统以及建筑材料泵 (Hydraulic drive system for a construction material pump and construction material pump ) 是由 J-M·法伊特 于 2019-06-07 设计创作，主要内容包括：本发明涉及一种用于建筑材料泵(200)的液压驱动系统(100),所述液压驱动系统(100)具有：用于液压液(HF)的液压回路(101)；馈给泵(2),该馈给泵(2)被构造用于将液压液(HF)馈入到所述液压回路(101)的里面；至少一个能操控的限压阀单元(6、24),所述限压阀单元被构造用于在压力范围(pmin、pmax)之内可变地调节所述液压回路(101)的至少一个区段(30、31、32)的液压液(HF)的极限压力(p30、p31/32)；以及——控制单元(27),该控制单元被构造用于根据所述液压驱动系统(100)和/或液压液(HF)的至少一个运行参数(BP)来如此操控所述限压阀单元(6、24),使得所述限压阀单元(6、24)调节所述液压回路(101)的区段(30、31、32)的极限压力(p30、p31/32)。(The invention relates to a hydraulic drive system (100) for a construction material pump (200), the hydraulic drive system (100) having: a hydraulic circuit (101) for Hydraulic Fluid (HF); a feed pump (2), wherein the feed pump (2) is designed to feed Hydraulic Fluid (HF) into the hydraulic circuit (101); at least one controllable pressure-limiting valve unit (6, 24) which is designed to variably adjust a limit pressure (p 30, p 31/32) of a Hydraulic Fluid (HF) of at least one section (30, 31, 32) of the hydraulic circuit (101) within a pressure range (pmin, pmax); and a control unit (27) which is designed to actuate the pressure-limiting valve unit (6, 24) as a function of at least one operating parameter (BP) of the hydraulic drive system (100) and/or of the Hydraulic Fluid (HF) in such a way that the pressure-limiting valve unit (6, 24) sets a limit pressure (p 30, p 31/32) of a section (30, 31, 32) of the hydraulic circuit (101).)

1. A hydraulic drive system (100) for a construction material pump (200), the hydraulic drive system (100) having:

-a hydraulic circuit (101) for hydraulic liquid (HF);

-a feed pump (2) configured for feeding hydraulic liquid (HF) into the hydraulic circuit (101);

-at least one controllable pressure-limiting valve unit (6, 24) which is designed to variably adjust a limit pressure (p 30, p 31/32) of a Hydraulic Fluid (HF) of at least one section (30, 31, 32) of the hydraulic circuit (101) within a pressure range (pmin, pmax); and

-a control unit (27) which is designed to actuate the pressure-limiting valve unit (6, 24) as a function of at least one operating parameter (BP) of the hydraulic drive system (100) and/or of Hydraulic Fluid (HF) in such a way that the pressure-limiting valve unit (6, 24) sets a limit pressure (p 30, p 31/32) of a section (30, 31, 32) of the hydraulic circuit (101).

2. The hydraulic drive system (100) of claim 1, having:

-a drive motor (70) configured for driving the feed pump (2).

3. The hydraulic drive system (100) of any one of the preceding claims,

-wherein the at least one operating parameter (BP) is a driving state, a driving flow, a driving pressure, a driving rotational speed, a cooling flow, a temperature (T) and/or a contamination level.

4. The hydraulic drive system (100) of any one of the preceding claims,

-wherein the pressure range is from a minimum of 2.5bar (pmin), in particular from a minimum of 5bar, in particular from a minimum of 10bar, in particular from a minimum of 15bar up to a maximum of 40bar (pmax), in particular up to a maximum of 35bar, in particular up to a maximum of 30bar, in particular up to a maximum of 25 bar.

5. The hydraulic drive system (100) of any one of the preceding claims,

-wherein the at least one pressure-limiting valve unit (6, 24) has at least one controllable proportional pressure-limiting valve which is designed to continuously adjust the limit pressure (p 30, p 31/32) of the Hydraulic Fluid (HF) of at least one section (30, 31, 32) of the hydraulic circuit (101) within the pressure range (pmin, pmax), and

-wherein the control unit (27) is configured for actuating the proportional-pressure limiting valve (6, 24) as a function of the at least one operating parameter (BP) in such a way that it regulates a limit pressure (p 30, p 31/32) of a section (30, 31, 32) of the hydraulic circuit (101).

6. The hydraulic drive system (100) of any one of the preceding claims,

-wherein at least one section of the hydraulic circuit (101) has a feed pressure section (30) for hydraulic liquid (HF), and

-wherein the at least one pressure limiting valve unit has a controllable feed pressure limiting valve unit (24) which is designed to variably adjust a feed limit pressure (p 30) of the Hydraulic Fluid (HF) of the feed pressure section (30) within the pressure range (pmin, pmax).

7. The hydraulic drive system (100) of any one of the preceding claims, having:

-a variably adjustable drive pump (1) configured for generating a variable drive flow of hydraulic liquid (HF) with a variable drive pressure in at least one drive pressure section (31, 32) of the hydraulic circuit (101); and

-at least one hydraulic pressure-based regulating mechanism (22, 23) configured for variably regulating the drive pump (1) by means of a variable regulating pressure (p 28, p 29) of a brake fluid (HF);

-wherein at least one section (30) of the hydraulic circuit (101) is configured for: the at least one adjusting means (22, 23) is hydraulically pressure-fed with a Hydraulic Fluid (HF) having a set limit pressure (p 30) for a set pressure (p 28, p 29);

-wherein the control unit (27) is configured for actuating the at least one adjusting means (22, 23) as a function of the at least one operating parameter (BP) in such a way that the at least one adjusting means (22, 23) adjusts the drive pump (1) for generating a variable drive flow of Hydraulic Fluid (HF) having a variable drive pressure in at least one drive pressure section (31, 32).

8. The hydraulic drive system (100) of claim 7,

-wherein the drive pump (1) is an axial piston pump having a variably adjustable swash plate,

-wherein the at least one adjustment mechanism (22, 23) is configured for variably adjusting the swash plate.

9. The hydraulic drive system (100) of claim 7 or 8, having:

-at least one drive cylinder (7, 8) and an associated drive piston (97, 98);

-wherein the drive pump (1) is configured for variably moving the at least one drive piston (97, 98) by the generation of a drive flow of hydraulic liquid (HF).

10. The hydraulic drive system (100) of claim 9, having:

-at least two drive cylinders (7, 8) and associated drive pistons (97, 98); and

-an oscillating circuit (19) for hydraulic liquid (HF);

-wherein the drive pump (1) and the two drive cylinders (7, 8) form a closed drive circuit for hydraulic liquid (HF) by means of the oscillating line (19); and

-wherein the two driving pistons (97, 98) are coupled by means of the oscillating line (19).

11. The hydraulic drive system (100) of any one of the preceding claims,

-wherein at least one section of the hydraulic circuit (101) has at least one low pressure section (31, 32) for hydraulic liquid (HF); and is

-wherein the at least one pressure limiting valve unit has an actuatable low-pressure limiting valve unit (6) which is designed to variably adjust a low limit pressure (p 31/p 32) of the Hydraulic Fluid (HF) of the at least one low-pressure section (31, 32) within a pressure range (pmin, pmax).

12. The hydraulic drive system (100) of any one of the preceding claims, having:

-a cooler (60) configured for cooling the hydraulic liquid (HF);

-wherein the at least one pressure-limiting valve unit (6, 24) is configured by an adjustment of the limit pressure (p 30, p 31/32) for variably adjusting a cooling flow of hydraulic liquid (HF) via the cooler (60); and is

-wherein the control unit (27) is configured for actuating the pressure-limiting valve unit (6, 24) as a function of the at least one operating parameter (BP) in such a way that the pressure-limiting valve unit (6, 24) regulates a cooling flow of Hydraulic Fluid (HF) via the cooler (60).

13. The hydraulic drive system (100) of any one of the preceding claims,

-wherein said at least one pressure limiting valve unit (5, 24) variably adjusts said limit pressure (p 30, p 31/32) by flushing hydraulic liquid (HF) out of said hydraulic circuit (101).

14. The hydraulic drive system (100) of any one of the preceding claims, having:

-at least one measuring sensor (80) configured for measuring at least one property of the hydraulic drive system (100) and/or hydraulic liquid (HF), in particular a temperature (T) and/or a degree of contamination;

-wherein the control unit (27) is configured for determining the at least one operating parameter (BP) from the measured characteristic (T).

15. A construction material pump (200) comprising:

-a construction material conveying unit (210) configured for conveying a construction material (BS);

-a hydraulic drive system (100) according to any of the preceding claims, configured for driving the construction material transport unit (210).

Technical Field

The invention relates to a hydraulic drive system for a construction material pump and to a construction material pump having such a hydraulic drive system.

Disclosure of Invention

The object of the present invention is to provide a hydraulic drive system for a construction material pump and a construction material pump having such a hydraulic drive system, which hydraulic drive system or which construction material pump has respectively improved performance.

The invention is solved by the provision of a hydraulic drive system having the features of claim 1 and a construction material pump having the features of claim 15. Advantageous developments and/or embodiments of the invention are specified in the dependent claims.

The hydraulic drive system according to the invention for a construction material pump has a hydraulic circuit, in particular at least one feed pump, at least one, in particular electrically controllable, pressure-limiting valve unit, and in particular an electrical control unit. The hydraulic circuit is designed for hydraulic fluid, in particular oil. In particular, the at least one feed pump is designed to feed hydraulic fluid into the hydraulic circuit, in particular automatically. The pressure-limiting valve unit is designed to set at least one limit pressure, in particular a limit pressure value or a limit pressure amount, of the hydraulic fluid of at least one section of the hydraulic circuit, in particular automatically, variably or adjustably, in particular within a pressure range, in particular a pressure value range, in particular during or during operation of the hydraulic drive system, in particular during a delivery operation of the construction material pump. The control unit is designed to actuate the pressure-limiting valve unit, in particular automatically, as a function of at least one operating parameter, in particular an operating parameter value or an operating parameter quantity, in particular desired by a user, of the hydraulic drive system and/or hydraulic fluid in such a way that the pressure-limiting valve unit in particular variably adjusts a limit pressure of a section of the hydraulic circuit.

This allows the limiting pressure to be set or adjusted, in particular lowered, as desired or adaptively. The feed pump should be able to work against the limiting pressure or against the limiting pressure. This enables a reduction of the required energy or power consumption of the feed pump, in particular of the feed pump. This can thus save energy or power.

In particular, when the at least one operating parameter or the value thereof is changed, the limit pressure or the value thereof can be changed, in particular actively. Additionally or alternatively, the limit pressure or its value need not be changed without changing the operating parameter or its value. In other words, the limit pressure or its value can be constantly set or constantly maintained without changing the operating parameters. In other words, the limit pressure or the value thereof and the at least one operating parameter or the value thereof can be linked to one another, in particular by means of a function.

The hydraulic circuit can have at least one hydraulic line, in particular a pipe and/or a hose.

The hydraulic drive system can have a container or tank, in particular a storage container, for or containing hydraulic fluid. The feed pump can be configured for feeding hydraulic fluid from the container. Additionally or alternatively, the feed pump can be a fixed displacement pump. In addition or alternatively, the feed pump can be designed to feed the hydraulic fluid directly and/or indirectly into the at least one section.

The pressure limiting valve unit can be referred to as a pressure regulating unit. In particular, the hydraulic drive system can have at least one, in particular electrical, pressure sensor. The pressure sensor can be designed to measure, in particular automatically, a limit pressure, in particular a limit pressure value or a limit pressure amount of a hydraulic fluid in a section of the hydraulic circuit. The control unit and/or the pressure-limiting valve unit can be designed to regulate, in particular to adjust, the limiting pressure as a function of the measured limiting pressure. In particular, the control unit and/or the pressure-limiting valve unit can each have a signal connection, in particular electrical, to the pressure sensor. In addition or alternatively, this can also be referred to as pressure regulation. In addition, the pressure limiting valve unit can be designed to adjust the limiting pressure to at least three different limiting pressure values. In particular, the pressure limiting valve unit can be designed to regulate the limiting pressure, in particular to perform a continuous regulation, with a pressure value step of at most 5bar, in particular at most 4bar, in particular at most 3bar, in particular at most 2bar, in particular at most 1 bar. In addition, the pressure range can additionally or alternatively have minimum and maximum limit pressure values or be defined by these minimum and maximum limit pressure values.

The operating parameter or the value thereof can be varied in steps, in particular continuously.

The control unit can have a user-actuable operating panel for operating the hydraulic drive system, in particular the construction material pump, in particular an input device for user input or user selection of at least one operating parameter or a value thereof. In addition or alternatively, the control unit can be designed to determine or ascertain, in particular calculate, the limiting pressure or a value thereof, in particular automatically, as a function of at least one operating parameter. In other words, the limit pressure can depend on at least one operating parameter and/or must have a specific or necessary value in order to achieve an operating parameter that is desired, in particular, by the user. In particular, the control unit can have a processor and/or a memory. In addition or alternatively, the control unit can have a signal connection, in particular electrical, to the pressure limiting valve unit.

In one embodiment of the invention, the hydraulic drive system has a drive motor. The drive motor is designed to drive the feed pump, in particular automatically. The required adjustment of the limit pressure or the value thereof enables a required energy or power consumption of the drive motor. In particular, the drive motor can be a combustion motor, in particular a diesel motor or an electric motor.

In one embodiment of the invention, the at least one operating parameter is a drive state, a drive flow, a drive pressure, a drive rotational speed, a cooling flow, a temperature and/or a degree of contamination. In particular, the drive state can be, in particular, the switching on or off or the driving or non-driving of the construction material pump. In the switched-off drive state, the limit pressure can be reduced in particular to a minimum limit pressure value. In addition or alternatively, the drive flow and/or the drive pressure can have, in particular, variable values or quantities and/or can be an operating parameter of the hydraulic fluid. In addition or alternatively, the drive rotational speed can have a variable value or quantity and/or can be an operating parameter (if present) of the feed pump and/or of the drive motor. In addition or alternatively, the cooling flow, the temperature and/or the degree of contamination can each have a variable value or quantity and/or can be an operating parameter of the hydraulic fluid.

In one embodiment of the invention, the pressure range is from a minimum of 2.5bar to a maximum of 40bar, in particular from a minimum of 5bar to a maximum of 35bar, in particular from a minimum of 10bar to a maximum of 30bar, in particular from a minimum of 15bar to a maximum of 25bar, or both of these ranges.

In one embodiment of the invention, the at least one pressure-limiting valve unit has in particular at least one, in particular electrically controllable, proportional pressure-limiting valve. The proportional pressure limiting valve is designed to continuously set a limit pressure, in particular a value thereof, of a hydraulic fluid of at least one section of the hydraulic circuit within the pressure range, in particular automatically. The control unit is designed to automatically actuate the proportional pressure limiting valve in particular as a function of the at least one operating parameter in such a way that the proportional pressure limiting valve continuously adjusts the limit pressure of a section of the hydraulic circuit in particular. In particular, the proportional pressure limiting valve can be referred to as a proportional pressure regulating valve.

In one embodiment of the invention, at least one section of the hydraulic circuit has a feed pressure section for hydraulic fluid. The at least one pressure limiting valve unit has a feed pressure limiting valve unit which can be actuated in an electrical manner. The feed pressure limiting valve unit is designed to variably adjust a feed limit pressure, in particular a feed limit pressure value or a feed limit pressure quantity, of the hydraulic fluid of the feed pressure section within a pressure range, in particular automatically. In particular, the control unit can be designed to actuate the feed pressure limiting valve unit, in particular automatically, as a function of at least one operating parameter in such a way that the feed pressure limiting valve unit in particular variably adjusts the feed limit pressure of the feed pressure section. The feed limit pressure or its value can depend on the drive state, the drive flow, the drive pressure, the drive rotational speed, the cooling flow, the temperature and/or the degree of contamination, if any. In addition or alternatively, the feed pressure limiting valve unit can be referred to as a feed pressure regulating unit. In addition, the feed pump can be designed to feed the hydraulic fluid directly or directly into the feed pressure section, as a supplement or as an alternative.

In one embodiment of the invention, the hydraulic drive system has in particular at least one variably adjustable drive pump and at least one hydraulic-pressure-based adjusting mechanism which can be actuated in particular electrically. The drive pump is configured to: in particular, a variable drive flow of the hydraulic fluid of at least one drive pressure section of the hydraulic circuit is generated in particular automatically, which drive flow has in particular a variable drive flow value or drive flow rate, has in particular a variable drive pressure, in particular a variable drive pressure value or drive pressure amount. The control device is designed to variably control the drive pump, in particular automatically, by means of a variable control pressure of the brake fluid, in particular with a variable control pressure value or control pressure quantity. At least one section of the hydraulic circuit, in particular the feed pressure section (if present), is designed to: the at least one adjusting means is supplied with a hydraulic fluid, in particular automatically, having an adjusted limit pressure, in particular an adjusted feed limit pressure, if present, for the adjusting pressure. The control unit is designed to actuate, in particular automatically, at least one adjusting means as a function of at least one operating parameter in such a way that the at least one adjusting means in particular variably adjusts the drive pump for generating a variable drive flow of hydraulic fluid in at least one drive pressure section with a variable drive pressure.

In particular, the drive pressure section can be referred to as a high-pressure and/or low-pressure section. Additionally or alternatively, the drive pressure section can be different from the feed pressure section (if present). In particular, the feed pressure section can be designed to feed hydraulic fluid into the drive pressure section, in particular by means of at least one feed check valve of the hydraulic drive system. In other words, the feed pump can be designed to feed hydraulic fluid into the drive pressure section in a circuitous or indirect manner.

In addition, the drive rotational speed (if present) can additionally or alternatively be an operating parameter of the drive pump. In particular, the drive motor can be designed to drive the drive pump, in particular automatically.

In addition or alternatively, the actuating pressure can depend on operating parameters, in particular on the drive state, the drive flow, the drive pressure and/or the drive rotational speed, and/or must have a specific or required value in order to achieve operating parameters that are desired in particular by the user. In particular, the control unit can be designed to determine or ascertain, in particular calculate, the control pressure or its value, in particular automatically, as a function of at least one operating parameter.

In addition or alternatively, the limit pressure, in particular the feed pressure (if present), can depend on the set pressure and/or must have a specific or required value in order to achieve the set pressure. In particular, the control unit can be designed to determine or ascertain, in particular calculate, a limit pressure or a value thereof, in particular automatically, as a function of the regulating pressure. In addition or alternatively, the control unit can have a signal connection, in particular hydraulic, to the actuating mechanism.

In particular for the switched-off drive state (if present), the drive pump need only generate a comparatively low drive flow or even no drive flow. Thus, only a comparatively low regulating pressure or no regulating pressure is required for regulating the drive pump. As a result, the limit pressure can be reduced in particular to a minimum limit pressure value. The minimum limit pressure value can maintain the function of the drive pump or avoid damage to the drive pump. For switched-on drive states (if present), a relatively higher regulating pressure may be required, in particular depending on the drive flow, the drive pressure and/or the drive rotational speed. Whereby a relatively higher extreme pressure may be required.

In addition, the drive pump can additionally or alternatively be an axial piston pump with a variably adjustable displacement volume. The at least one adjusting mechanism can be designed to variably adjust the displacement, in particular automatically.

In one embodiment of the invention, the drive pump is an axial piston pump having a variably adjustable swash plate. The at least one adjusting mechanism is designed to variably adjust the swash plate, in particular automatically. In particular, the pivot angle of the swashplate can be dependent on operating parameters, in particular on the drive state and/or the drive flow, and/or must have a specific or required value in order to achieve operating parameters that are desired, in particular, by a user. In particular, the control unit can be designed to determine or ascertain, in particular calculate, the pivot angle or its value, in particular automatically, as a function of the at least one operating parameter.

In one embodiment of the invention, the hydraulic drive system has at least one drive cylinder and an associated drive piston, in particular arranged in the drive cylinder. The drive pump is designed to move at least one drive piston, in particular in a drive cylinder, in a variable manner, in particular automatically, by generating a drive flow of hydraulic fluid. In particular, the hydraulic drive system can have at least one pump line. The drive pump and the drive cylinder can be connected by means of a pump line for the flow of hydraulic fluid, in particular between the drive pump and the drive cylinder. In addition or alternatively, the drive piston can be designed for being pressure-loaded with a hydraulic fluid. In addition, or alternatively, the control unit can be designed to control the movement of the drive piston, in particular automatically, as a function of at least one operating parameter.

In one embodiment of the invention, the hydraulic drive system has at least two drive cylinders and associated drive pistons, which are arranged in particular in the respective drive cylinders, and a pendulum circuit for the hydraulic fluid. The drive pump and the two drive cylinders form a closed drive circuit for the hydraulic fluid by means of an oscillating line. The two drive pistons are coupled in particular in antiphase by means of a pendulum line. In particular, the two drive cylinders can be connected by means of a pendulum line for the flow of hydraulic fluid, in particular between the drive cylinders. In addition or alternatively, the hydraulic drive system can 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 means of the oscillating line and the two pump lines. In particular, the drive pump and one of the two drive cylinders can be connected for the flow of hydraulic fluid, in particular between the drive pump and the drive cylinder, by means of one of the two pump lines. The drive pump and the other of the two drive cylinders can be connected for the flow of hydraulic fluid, in particular between the drive pump and the drive cylinder, by means of the other of the two pump lines. In addition or alternatively, the drive pump or the closed drive circuit can have a high-pressure side and a low-pressure side, which can be exchanged in particular periodically, in particular during or during operation of the hydraulic drive system, in particular during the conveying operation of the construction material pump. In particular, the drive pressure can be referred to as a high pressure, in particular on the high pressure side. In particular, the low pressure or the low limiting pressure on the low pressure side can be generated or generated by the feed pump, in particular the feed limiting pressure (if present). The drive pressure or the high pressure or the value thereof can be higher than the low pressure or the low limit pressure or the value thereof. A closed drive circuit in particular can mean a flow of hydraulic fluid from the drive pump, in particular the high-pressure side thereof, through one of the pump connections, one of the drive cylinders, the pendulum connection, the other drive cylinder, the other pump connection to the drive pump, in particular the low-pressure side thereof.

In one embodiment of the invention, at least one section of the hydraulic circuit has at least one low-pressure section for hydraulic fluid. The at least one pressure limiting valve unit has a low-pressure limiting valve unit which can be actuated in an electrical manner. The low-pressure limiting valve unit is designed to variably adjust a low limiting pressure, in particular a low limiting pressure value or a low limiting pressure quantity, of the hydraulic fluid of at least one low-pressure section within a pressure range, in particular automatically. In particular, the control unit can be designed to: the low-pressure limiting valve unit is controlled in particular automatically as a function of at least one operating parameter in such a way that it variably adjusts the low limiting pressure of at least one low-pressure section in particular. The lower limiting pressure or its value can depend on the cooling flow, the temperature and/or the degree of contamination, if any. In addition or alternatively, the low-pressure limiting valve unit can be referred to as a low-pressure regulating unit. In addition, the low-pressure section can be referred to as a drive pressure section in addition or alternatively. In addition, the low-pressure section can be different from the feed-pressure section (if present) as a supplement or alternative. In particular, the feed pressure section can be designed to feed hydraulic fluid into the low pressure section, in particular by means of at least one feed check valve of the hydraulic drive system. In other words, the feed pump can be designed to feed hydraulic fluid into the low-pressure region in a circuitous or indirect manner. In other words, the low limit pressure or its value can be lower than the feed limit pressure or its value. In addition, the hydraulic drive system can have a reversing flushing valve, in addition or as an alternative. The low-pressure section and the low-pressure limiting valve unit can be connected for the flow of hydraulic fluid, in particular from the low-pressure section to the low-pressure limiting valve unit, by means of a reversing flushing valve.

In one embodiment of the invention, the hydraulic drive unit can have a cooler. The cooler is designed to cool the hydraulic fluid, in particular automatically. The at least one pressure-limiting valve unit is designed by adjusting the limiting pressure for adjusting the cooling flow, in particular via or through a cooler, of the hydraulic fluid, in particular automatically and variably. The control unit is designed to actuate the pressure-limiting valve unit, in particular automatically, as a function of at least one operating parameter, in particular temperature (if present), in such a way that the pressure-limiting valve unit in particular variably regulates the cooling flow of hydraulic fluid via the cooler. This allows the cooling flow to be adjusted or regulated, in particular reduced, as desired or adaptively. This enables a reduction in the required energy or power consumption of the feed pump, in particular of the feed pump. In particular, the cooling flow or the value thereof can be set or defined via or by the pressure difference (if present) between the feed limit pressure and the lower limit pressure. In other words, the low limiting pressure can be set as a function of the particularly required cooling flow and the particularly required feed limiting pressure. In addition or alternatively, the hydraulic drive system can be designed to flush or feed cooling fluid out of (if present) a hydraulic circuit, in particular a section, in particular a low-pressure section, of the, in particular, closed drive circuit via a cooler.

In one development of the invention, the at least one pressure-limiting valve unit variably adjusts the limiting pressure by, in particular, automatically and/or variably flushing hydraulic fluid out of the hydraulic circuit, in particular a section, or in particular to the feed pump and/or into the container (if present). In particular, the pressure limiting valve unit can be designed as a throttle valve unit.

In one embodiment of the invention, the hydraulic drive system has at least one, in particular electrical, measuring sensor. The measuring sensor is designed to measure, in particular automatically, at least one property of the hydraulic drive system and/or the hydraulic fluid, in particular a value or a quantity of said property and/or in particular a temperature and/or in particular a degree of contamination. The control unit is designed to determine at least one operating parameter, in particular automatically, as a function of the measured characteristic. In particular, the control unit can have a signal connection, in particular electrical, with the measuring sensor. Additionally or alternatively, the operating parameter can correspond to or be a measured characteristic.

Furthermore, the invention relates to a construction material pump. The construction material pump according to the invention has a construction material conveying unit and the hydraulic drive system. The construction material conveying unit is designed for conveying construction material, in particular automatically. The hydraulic drive system is designed for driving the construction material conveying unit, in particular automatically.

The construction material pump achieves the same advantages as the hydraulic drive system described above.

In particular, the construction material pump or the construction material delivery unit or the construction material can have at least one delivery parameter, in particular a value or a quantity, which is variable or can be varied. In particular, the at least one delivery parameter can be a delivery state, a delivery flow and/or a delivery pressure. In addition or alternatively, the at least one operating parameter can depend on at least one conveying parameter and/or must have a specific or required value in order to achieve a conveying parameter that is desired, in particular, by a user. In particular, the drive state can depend on the delivery state, the drive flow can depend on the delivery flow and/or the drive pressure can depend on the delivery pressure (if present). In other words, the control unit can be designed to determine or ascertain, in particular calculate, at least one operating parameter or the value thereof, in particular automatically, as a function of at least one conveying parameter. In addition or alternatively, the control unit can have an operating panel for user-controllable operation of the construction material pump or the hydraulic drive system, in particular an input device for user input or user selection of at least one delivery parameter or a value thereof.

In addition, the construction material pump can be referred to as a concrete pump or a slurry pump, as an addition or as an alternative. Mud can mean mortar, cement, mortar, concrete, marl and/or slush.

In addition, the device can be designed as a mobile device, in particular as a walking construction material pump, as a supplement or as an alternative.

Drawings

Further advantages and aspects of the invention emerge from the claims and from the following description of a preferred embodiment of the invention, which is explained below with the aid of the drawings. Here:

fig. 1 shows a schematic circuit diagram of a hydraulic drive system according to the invention of a construction material pump according to the invention; and is

Fig. 2 shows a schematic circuit diagram of a cut-out of the hydraulic drive system of fig. 1 and of a construction material conveying unit of the construction material pump according to the invention.

Detailed Description

The construction material pump 200 according to the invention has a construction material feed unit 210 and the hydraulic drive system 100 according to the invention. The construction material conveying unit 210 is configured to convey the construction material BS. The hydraulic drive system 100 is configured to drive a construction material transport unit 210.

The hydraulic drive system 100 has a hydraulic circuit 101, a feed pump 2, at least one controllable pressure-limiting valve unit 6, 24 and a control unit 27, as shown in fig. 1. The hydraulic circuit 101 is designed for hydraulic fluid HF. The feed pump 2 is designed to feed hydraulic fluid HF into the hydraulic circuit 101. The pressure-limiting valve units 6, 24 are designed to variably adjust the limit pressures p30, p31/32 of the hydraulic fluid HF of at least one section 30, 31, 32 of the hydraulic circuit 101 within the pressure ranges pmin, pmax. The control unit 27 is designed to control the pressure-limiting valve units 6, 24 as a function of at least one operating parameter BP of the hydraulic drive system 100 and/or as a function of the hydraulic fluid HF in such a way that the pressure-limiting valve units 6, 24 set the limit pressures p30, p31/32 of the sections 30, 31, 32 of the hydraulic circuit 101.

In particular, the control unit 27 has an electrical signal connection to the pressure-limiting valve units 6, 24.

In detail, the at least one operating parameter BP is a drive state, a drive flow, a drive pressure, a drive rotational speed, a cooling flow, a temperature T and/or a degree of contamination.

The pressure range is from a minimum of 10bar pmin to a maximum of 35bar pmax. In an alternative embodiment, the pressure range can be from a minimum of 2.5bar to a maximum of 40 bar.

In the exemplary embodiment shown, the at least one pressure-limiting valve unit 6, 24 has an actuatable proportional pressure-limiting valve. The proportional pressure-limiting valves 6, 24 are designed to continuously adjust the limit pressures p30, p31/32 of the hydraulic fluid HF of at least one section 30, 31, 32 of the hydraulic circuit 101 within the pressure ranges pmin, pmax. The control unit 27 is designed to control the proportional pressure-limiting valves 6, 24 as a function of at least one operating parameter BP in such a way that the proportional pressure-limiting valves 6, 24 set the limit pressures p30, p31/32 of the sections 30, 31, 32 of the hydraulic circuit 101.

In alternative embodiments, the at least one pressure-limiting valve unit need not have a proportional pressure-limiting valve or the at least one pressure-limiting valve unit can be formed differently.

In the exemplary embodiment shown, the hydraulic drive system 100 has two controllable pressure-limiting valve units 6, 24. In alternative embodiments, the hydraulic drive system need not have two controllable pressure-limiting valve units or the hydraulic drive system can have only one controllable pressure-limiting valve unit or at least three controllable pressure-limiting valve units.

In particular, the hydraulic drive system can have, in particular, a controllable throttle valve unit, in particular a proportional throttle valve, instead of the pressure-limiting valve unit 6. The throttle valve unit can be configured to variably adjust the flow of hydraulic fluid. The control unit can be designed to control the throttle valve unit as a function of at least one operating parameter of the hydraulic drive system and/or of the hydraulic fluid in such a way that it can regulate the flow.

In detail, at least one section of the hydraulic circuit 101 has a feed pressure section 30 for hydraulic liquid HF. The pressure-limiting valve unit 24 has a feed pressure-limiting valve unit or is a feed pressure-limiting valve unit. The feed pressure limiting valve unit 24 is designed to variably adjust the feed limit pressure p30 of the hydraulic fluid HF fed to the pressure section 30 within the pressure ranges pmin, pmax.

In the exemplary embodiment shown, the feed pump is designed to feed hydraulic fluid HF from the reservoir 50 of the hydraulic drive system 100 directly into the feed pressure section 30, as indicated by the arrow.

Furthermore, at least one section of the hydraulic circuit 101 has at least one low-pressure section 31, 32 for hydraulic fluid HF. The pressure-limiting valve unit 6 has a controllable low-pressure limiting valve unit or is a low-pressure limiting valve unit. The low-pressure limiting valve unit 6 is designed to variably adjust the low limit pressure p31/p32 of the hydraulic fluid HF of at least one low-pressure section 31, 32 within the pressure range pmin, pmax. In an alternative embodiment, the hydraulic drive system can have, in particular, a throttle valve unit instead of a low-pressure limiting valve unit.

In the exemplary embodiment shown, the feed pressure section 30 is designed to feed hydraulic fluid HF into the low-pressure sections 31, 32, in particular by means of at least one feed check valve 3, 4 of the hydraulic drive system 100, as indicated by the arrows.

Furthermore, in the exemplary embodiment shown, the hydraulic circuit 101 has two low-pressure or high-pressure or driving pressure sections 31, 32. Furthermore, the hydraulic drive system 100 has two feed-in check valves 3, 4.

Furthermore, the hydraulic drive system 100 has a variably adjustable drive pump 1 and at least one adjusting mechanism 22, 23 in the form of an adjusting cylinder based on the hydraulic pressure. The drive pump 1 is designed to generate a variable drive flow of hydraulic fluid HF with a variable drive pressure in at least one, in particular drive pressure section 31, 32 of the hydraulic circuit 101. The actuating means 22, 23 are designed to variably adjust the drive pump 1 by means of a variable actuating pressure p28, p29 of the hydraulic fluid HF. At least one section 30 of the hydraulic circuit 101, in particular the feed pressure section 30, is designed to: at least one regulating means 22, 23 is hydraulically pressure-fed with hydraulic fluid HF having a regulated limit pressure p30, in particular a regulated feed limit pressure p30, for the regulating pressure p28, p 29. The control unit 27 is designed to actuate the at least one adjusting means 22, 23 as a function of the at least one operating parameter BP in such a way that the at least one adjusting means 22, 23 adjusts the drive pump 1 for generating a variable drive flow of hydraulic fluid HF with a variable drive pressure in the at least one drive pressure section 31, 32.

In particular, the control unit 27 has a hydraulic signal connection to at least one of the adjusting devices 22, 23.

In the exemplary embodiment shown, the hydraulic drive system 100 has two hydraulic pressure-based control devices 22, 23.

In detail, the drive pump 1 has an axial piston pump with a variably adjustable swash plate. The at least one adjusting mechanism 22, 23 is designed to variably adjust the swash plate.

The hydraulic drive system 100 furthermore has at least one drive cylinder 7, 8 and associated drive pistons 97, 98. The drive pump 1 is designed to move at least one drive piston 97, 98 by generating a drive flow of hydraulic fluid HF.

In the exemplary embodiment shown, the hydraulic drive system 100 has at least two, in particular exactly two, drive cylinders 7, 8 and respectively associated drive pistons 97, 98.

The hydraulic drive system 100 additionally has a pendulum line 19 for hydraulic fluid HF. The drive pump 1 and the two drive cylinders 7, 8 form a closed drive circuit for the hydraulic fluid HF by means of the oscillating line 19. The two drive pistons 97, 98 are coupled in particular in antiphase by means of the oscillating line 19.

In detail, the two driving cylinders 7, 8 are connected by means of an oscillating line 19.

The hydraulic drive system 100 additionally has two pump lines 17, 18 for hydraulic fluid HF. The drive pump 1 and the drive cylinder 7 are connected by means of a pump line 17. The drive pump 1 and the drive cylinder 8 are connected by means of a pump line 18.

In detail, the drive pump 1 and the two drive cylinders 7, 8 form a closed drive circuit for the hydraulic fluid HF by means of the oscillating line 19 and the two pump lines 17, 18.

In the embodiment shown, the drive state is switched on, the particularly necessary drive flow is comparatively high and the particularly necessary drive pressure is comparatively high. The feed limit pressure p30 is therefore set to 32bar, in particular, constantly. The low limiting pressure p31 is set in particular constantly at 30 bar.

The drive pump 1 or the closed drive circuit has a high-pressure side HD and a low-pressure side ND which are periodically interchanged during operation of the hydraulic drive system 110 or the construction material conveying unit 210. The driving pressure or high pressure HD is higher than the low limit pressure p31 or low pressure ND.

In fig. 1, the high pressure side HD is below and the low pressure side is above.

The hydraulic fluid HF with the drive pressure or high pressure HD flows from the drive pump 1 via the pump line 18 to the drive cylinder 8, as indicated by the arrow. In this case, the pump line 18 and the drive cylinder 8 form, in particular, at least in part, a high-pressure section 32.

As a result, the drive piston 98 moves to the right in fig. 1, as indicated by the arrow.

Hydraulic fluid HF, in particular with a pivoting pressure, flows from the drive cylinder 8 to the drive cylinder 7 via the pivoting line 19, as indicated by the arrow. In this case, the oscillating line 19 and the drive cylinder 7 form, in particular, an oscillating pressure section at least in part.

Thereby, the drive piston 97 moves to the left in fig. 1, as indicated by the arrow.

Hydraulic fluid HF with a low limit pressure p31 or a low pressure ND flows from the drive cylinder 7 through the pump line 17 to the drive pump 1, as indicated by the arrow. In this case, the pump line 17 and the drive cylinder 7 form, in particular, at least in part, a low-pressure section 31.

In this case, the feed pressure section 30 feeds the low pressure section 31, in particular by means of the feed check valve 3, as indicated by the arrow.

If the pistons 97, 98 have reached their final position, the high-pressure side HD and the low-pressure side ND are exchanged. Then, the high voltage side HD is above and the low voltage side ND is below. Thereby, the drive piston 98 moves leftward and the drive piston 97 moves rightward.

In an alternative embodiment, the drive state can be on, but the drive flow can be medium and the drive pressure can be medium. The feed limit pressure can then be reduced and, in particular, constantly set to, for example, 22bar and the low limit pressure can be reduced and, in particular, constantly set to, for example, 20 bar.

Furthermore, in an alternative embodiment, the driving state can be switched off. The feed limit pressure can then be reduced and, in particular, constantly adjusted to, for example, 12bar, and the low limit pressure can be reduced and, in particular, constantly adjusted to, for example, 10 bar.

Furthermore, the at least one pressure-limiting valve unit 6, 24 is designed to variably adjust the limiting pressures p30, p31/32 by flushing hydraulic fluid HF out of the hydraulic circuit 101, in particular into the container 50. In an alternative embodiment, the at least one pressure-limiting valve unit can be designed to variably adjust the limiting pressure by flushing hydraulic fluid out of the hydraulic circuit, in particular through a filter, and/or to the feed pump, in particular to the intake side of the feed pump.

In detail, the feed pressure limiting valve 24 is designed in such a way that it flushes the hydraulic fluid HF out of the feed pressure section 30 in order to variably adjust the feed limit pressure p30, as indicated by the arrow.

In fig. 1, a portion of the hydraulic fluid HF flows out of the feed pressure section 30 and into the low-pressure section 31. Another part of the hydraulic liquid HF is flushed out of the feed pressure section 30.

The low-pressure limiting valve unit 6 is designed in such a way that it flushes hydraulic fluid HF out of the low-pressure sections 31, 32 for variably setting the low limiting pressure p31/32, as indicated by the arrow.

In an alternative embodiment, the hydraulic drive system can have, in particular, a throttle valve unit, in particular instead of a low-pressure limiting valve unit. The throttle valve unit can be designed to variably adjust the flow, in particular the flushing flow, of the hydraulic fluid out of the low-pressure region. The control unit can be designed to control the throttle valve unit as a function of at least one operating parameter of the hydraulic drive system and/or of the hydraulic fluid in such a way that it can regulate the flow of hydraulic fluid out of the low-pressure region.

In fig. 1, a part of the hydraulic liquid HF flows from the low-pressure section 31 to the drive pump 1. Another part of the hydraulic liquid HF is flushed out of the low-pressure zone 31.

In detail, the hydraulic drive system 100 has a reversing flush valve 5. The low-pressure sections 31, 32 and the low-pressure limiting valve unit 6 are connected for the flow of hydraulic fluid HF by means of the reversing flushing valve 5. In other words, in fig. 1, hydraulic liquid HF flows from the low-pressure section 31 through the switching flushing valve 5 to the low-pressure limiting valve unit 6, as indicated by the arrow.

In particular, the hydraulic drive system 100 has two, in particular hydraulic, control lines 25, 26 for the, in particular automatic, control of the directional flushing valve 5.

In detail, the hydraulic drive system 100 has two flushing lines 20, 21 for the hydraulic fluid HF. The pump line 17 and the reversing flushing valve 5 are connected by means of a flushing line 21. The pump line 18 and the reversing flushing valve 5 are connected by means of a flushing line 20. Furthermore, the directional flushing valve 5 is designed to connect the respective flushing line 20, 21 to the low-pressure limiting valve unit 6, in particular for the flow of hydraulic fluid HF from the respective flushing line 20, 21 to the low-pressure limiting valve unit 6, which has a comparatively low pressure in fig. 1 relative to the other flushing line, the flushing line 21.

Furthermore, the hydraulic drive system 100 has a cooler 60. The cooler 60 is designed to cool the hydraulic fluid HF. The at least one pressure-limiting valve unit 6, 24 is designed by adjusting the limiting pressure p30, p31/32 to variably adjust the cooling flow, in particular of hydraulic fluid HF, via the cooler 60. The control unit 27 is designed to control the pressure-limiting valve units 6, 24 as a function of at least one operating parameter BP, in particular the temperature T, in such a way that the pressure-limiting valve units 6, 24 regulate the cooling flow of the hydraulic fluid HF via the cooler 60.

In an alternative embodiment, the hydraulic drive system can have, in particular, a throttle unit instead of the pressure-limiting valve unit 6. The throttle valve unit can be designed to variably adjust a cooling flow, in particular of the hydraulic fluid, via the cooler. The control unit can be designed to control the throttle valve unit as a function of at least one operating parameter, in particular temperature, in such a way that it can regulate the cooling flow of the hydraulic fluid via the cooler.

In detail, the cooling flow is regulated by the pressure difference between the feed limit pressure p30 and the low limit pressure p 31/32.

In the embodiment shown, the temperature T is medium. The pressure difference is thus adjusted, in particular constantly, to 2 bar. In an alternative embodiment, the temperature can be quite high. The pressure difference can then be increased and, in particular, constantly adjusted to, for example, 3 bar. In particular, the low limiting pressure can be reduced and in particular constantly set with respect to the feed limiting pressure. Furthermore, in an alternative embodiment, the temperature can be quite low. The pressure difference can then be reduced, in particular constantly adjusted, to, for example, 1 bar. In particular, the low limiting pressure can be increased and in particular constantly set in relation to the feed limiting pressure.

In the exemplary embodiment shown, hydraulic drive system 100 is designed to flush cooling system 22 out of hydraulic circuit 101, in particular low-pressure sections 31, 32, via cooler 60. In other words, the cooler 60 is arranged behind or behind the low-pressure limiting valve unit 6, in particular in the flow direction, and in particular in front of the container 50. In other words, the hydraulic liquid HF flows from the low-pressure limiting valve unit 6 via or through the cooler 60 to the container 50, as indicated by the arrow. In an alternative embodiment, the hydraulic drive system can be designed to flush the cooling fluid out of the hydraulic circuit, in particular the low-pressure section, and/or to the feed pump, in particular to the intake side of the feed pump, via a cooler, in particular through the filter, in particular. In other words, hydraulic fluid can flow from the low-pressure limiting valve unit via or through the cooler and in particular through the filter, in particular, to the feed pump, in particular to the intake side of the feed pump. In addition or alternatively, in an alternative embodiment, the hydraulic drive system can have, in particular, a throttle valve unit, in particular instead of a low-pressure limiting valve unit.

Furthermore, the hydraulic drive system 100 has at least one measuring sensor 80. The measuring sensor 80 is designed to measure at least one property of the hydraulic drive system 100 and/or of the hydraulic fluid HF. The control unit 27 is designed to determine at least one operating parameter BP as a function of the measured characteristic.

In particular, the control unit 27 has an electrical signal connection to the measuring sensor 80.

In the exemplary embodiment shown, the hydraulic drive system 100 has only one single measuring sensor 80. In an alternative embodiment, the hydraulic drive system can have at least two measuring sensors.

Furthermore, in the exemplary embodiment shown, the measurement sensor 80 is designed to measure the temperature T of the hydraulic fluid HF and thus of the hydraulic drive system 100. The control unit 27 is designed to determine at least one operating parameter BP as a function of the measured temperature T.

In detail, the measuring sensor 80 is designed to measure the temperature T of the hydraulic fluid HF in the low-pressure sections 31, 32. In other words, the measuring sensor 80 is arranged in particular in the flow direction behind the reversing flushing valve 5 and in front of the low-pressure limiting valve unit 6. In an alternative embodiment, the measuring sensor can be arranged at or in the drive pump, in particular in the oil drain of the drive pump.

Furthermore, the hydraulic drive system 100 has a drive motor 70. The drive motor 70 is designed to drive the feed pump 2 and in particular additionally the drive pump 1.

Furthermore, the construction material conveying unit 210 has at least one, in particular two conveying cylinders 34, 35 and one, in particular two associated conveying pistons 38, 39, which are arranged in particular in the conveying cylinders 34, 35, as shown in fig. 2. In particular, the at least one conveying cylinder 34, 35 is designed for the construction material BS. The at least one conveying cylinder 34, 35 is designed for pressure-loading the construction material BS.

The hydraulic drive system 100 additionally has at least one, in particular two, piston rods 95, 96. The at least one piston rod 95, 96 is designed to couple or transmit a movement of the at least one drive piston 97, 98 to the at least one delivery piston 38, 39. In particular, the at least one piston rod 95, 96 is fastened to at least one drive piston 97, 98 and/or at least one delivery piston 38, 39.

Furthermore, the construction material conveying unit 210 has a pipe changeover system 99.

As the exemplary embodiments shown and explained above clearly show, the invention provides an advantageous hydraulic drive system for a construction material pump and an advantageous construction material pump having such a hydraulic drive system, which have in each case improved performance, in particular energy or power savings.