Construction machine, in particular for the delivery of construction material and / or thick matter

Abstract

The invention relates to a construction machine (1), comprising a main drive train (2) which comprises a main drive device (3) and a main functional unit (4), wherein the main drive device (3) and the main functional unit (4) are drive-connectable or drive-connected to one another, an auxiliary drive train (5) which comprises at least one hydraulically drivable auxiliary functional unit (6), a hydraulic displacement machine (7) with a motor mode and with a pumping mode, a storage device (8) for buffer-storing energy which the hydraulic displacement machine (7) generates in its motor mode, and a hydraulic line (9) for hydraulically drive-connecting the hydraulic displacement machine (7), the main drive train (2) and the auxiliary drive train (5) to one another, wherein the at least one auxiliary functional unit (6) can be supplied with buffer-stored energy from the storage device (8) via the hydraulic line (7) by means of the hydraulic displacement machine (7) which is in pumping mode, in order to hydraulically drive the at least one auxiliary functional unit (6) independently of the main functional unit (4) and / or independently of the main drive device (3).

Description

[0001] CONSTRUCTION MACHINE, ESPECIALLY FOR CONSTRUCTION AND / OR HIGH-POURING PRODUCTS

[0002] The invention relates to a construction machine, in particular for conveying construction and / or thick material.

[0003] Construction machines, particularly those used for construction and / or conveying thick materials, typically have a main drive device, which may include an internal combustion engine. The main drive device is typically used to supply energy to both a main functional unit and all auxiliary functional units of the construction machine. Therefore, the main drive device is typically designed to provide sufficient power at its optimal operating point to simultaneously drive the main functional unit and all auxiliary functional units. However, the main drive device is typically also operated when only one of the auxiliary functional units is to be driven while the main functional unit of the construction machine is inactive. If only the at least one auxiliary functional unit is active, the main drive device may consequently be oversized.This may result in the main propulsion system not always operating at its optimal operating point, depending on the current combination of active and inactive functional units. If the main propulsion system is not operating at its optimal operating point, it will operate below its optimal efficiency and with a comparatively high specific fuel consumption.

[0004] It is an object of the present invention to provide a construction machine which can be operated particularly efficiently across various, in particular all, of its functions.

[0005] This object is achieved by the subject matter of independent patent claim 1. Preferred embodiments are the subject matter of the dependent patent claims.

[0006] A construction machine according to the invention is used in particular for conveying construction and / or high-density materials. In this respect, the construction machine can be a construction and / or high-density material pumping device, in particular a concrete pumping device. The construction machine can be a mobile concrete pumping device, in particular in the form of a trailer-mounted concrete pump or a truck-mounted concrete pump.

[0007] In this context, thick aggregate refers to a paste-like mixture of different materials. Examples of thick aggregate include mortar, cement, screed, or concrete, each in a mixable and / or conveyable state. In this mixable and / or conveyable state, the thick aggregate has not yet hardened. Specifically, thick aggregate is a building material.

[0008] The construction machine according to the invention has a main drive train. The main drive train comprises a main drive device and a main functional unit. The main functional unit can be used to implement a main function of the construction machine. The main drive device and the main functional unit are drive-connectable and / or drive-connected to one another.

[0009] The term "drive-connectable" can refer to the fact that the components in question are designed to be drive-connected to one another, or that a drive connection between the drive-connectable components is separable or detachable. The term "drive-connected" can refer to the fact that the components in question are coupled to one another in a power-transmitting manner, in particular—unless otherwise stated—directly or immediately.

[0010] The construction machine according to the invention also has an auxiliary drive train. The auxiliary drive train has at least one hydraulically driven auxiliary functional unit. The at least one, in particular each, auxiliary functional unit can serve to implement an auxiliary function of the construction machine.

[0011] The construction machine according to the invention further comprises a hydraulic displacement machine with motor operation and with pump operation. The hydraulic displacement machine can thus be operated either as a hydraulic motor or as a hydraulic pump. In its motor operation, the hydraulic displacement machine can provide drive energy or drive power, in particular kinetic energy. In its pump operation, the hydraulic displacement machine can be driven, i.e., in its pump operation, the hydraulic displacement machine can absorb kinetic energy or mechanical drive power, in particular to convey hydraulic fluid and / or to generate a pressure gradient in the hydraulic fluid that increases in the conveying direction via the hydraulic displacement machine.

[0012] In addition, the construction machine according to the invention has a storage device for temporarily storing energy generated by the hydraulic displacement machine during its motor operation. In other words, the hydraulic displacement machine provides energy during its motor operation, which energy can be supplied to the storage device to charge the storage device for temporarily storing the energy. The construction machine according to the invention also has a hydraulic line for hydraulically connecting the hydraulic displacement machine and the main drive train and the auxiliary drive train to one another. The hydraulic line can be part of a hydraulic circuit of the construction machine.The at least one auxiliary functional unit can be supplied with temporarily stored energy from the storage device via the hydraulic line by means of the hydraulic displacement machine in pumping mode, in order to hydraulically drive the at least one auxiliary functional unit independently of the main functional unit and / or independently of the main drive device. During its pumping mode, the hydraulic displacement machine can draw energy from the storage device. In this respect, the storage device can function as a buffer storage.

[0013] Because the at least one auxiliary functional unit can be driven by means of the hydraulic displacement machine independently of the main functional unit and / or independently of the main drive device, the main drive device can advantageously be deactivated when the auxiliary functional unit is to be driven exclusively - i.e. without driving the main functional unit. Thus, in the construction machine according to the invention, an operating state can be avoided in which more energy is generated by means of the main drive device than is required in the situation when the at least one auxiliary functional unit is operated exclusively. Therefore, the construction machine according to the invention can be operated particularly efficiently across its functions, i.e. the main function and the at least one auxiliary function, in particular when the auxiliary functional unit is operated exclusively.

[0014] In an embodiment of the invention, the storage device comprises an electrical energy storage device and an electrical machine drive-connected to the hydraulic displacement machine. The electrical machine has a generator mode and a motor mode. In its generator mode, the electrical machine can be operated as an electrical generator to generate electrical energy. In its motor mode, the electrical machine can be operated as an electric motor, in which it draws electrical energy and converts it into kinetic energy. The energy storage device is electrically connected to the electrical machine. Accordingly, in its motor mode, the electrical machine can draw electrical energy from the electrical energy storage device, so that the electrical energy storage device is discharged.In its generator mode, the electric machine can supply electrical energy to the electrical energy storage device, thereby charging the electrical energy storage device. The electrical energy storage device can comprise an electrical capacitor. The electrical energy storage device can be an electrochemical energy storage device, for example in the form of an electric accumulator. Alternatively or additionally, the storage device has a mechanical, hydraulic, and / or pneumatic energy storage device. The mechanical energy storage device can, for example, comprise a flywheel or a spring accumulator. The hydraulic and / or pneumatic energy storage device can, for example, comprise a hydraulic accumulator and / or a pressure accumulator.

[0015] In a further embodiment of the invention, the main functional unit comprises a construction and / or high-density material pumping unit for conveying construction and / or high-density material. The auxiliary functional unit has an agitator for mixing the construction and / or high-density material to be conveyed. The construction and / or high-density material pumping unit and the agitator can be operated independently of one another, so that, for example, the construction and / or high-density material can be mixed by means of the agitator without conveying any construction and / or high-density material. Such exclusive operation of the agitator can be advantageous if a period of time needs to be bridged until a new batch of construction and / or high-density material is delivered. The construction machine can have further auxiliary functional units.Such additional auxiliary functional units can be selected from a flushing water pump, a high-pressure pump for high-pressure cleaning, an air compressor, a cable drum for electrical connection to a construction site power distributor and at least one hydraulic cylinder for a lowering magazine of the construction machine.

[0016] In a further embodiment of the invention, the construction machine has a first operating mode. In the first operating mode, the hydraulic displacement machine is in its motor mode, while the main drive train and the auxiliary drive train are active. In the first operating mode, the electric machine can be in its generator mode. The construction machine also has a second operating mode. In the second operating mode, the main drive train is inactive, while the auxiliary drive train is active. In the second operating mode, the auxiliary functional unit is supplied with temporarily stored energy from the storage device via the hydraulic line by means of the hydraulic displacement machine in pump mode in order to hydraulically drive the auxiliary functional unit. The construction machine can be switched between its operating modes depending on the situation, in particular by means of an automatic machine control system of the construction machine.

[0017] In a further embodiment of the invention, the main functional unit can be supplied with temporarily stored energy from the storage device via the hydraulic line by means of the hydraulic displacement machine in pumping operation in order to hydraulically drive the main functional unit, in particular independently or in a supporting capacity.

[0018] In a further embodiment of the invention, the construction machine has a third operating mode. In the third operating mode, the main drive device is deactivated, while the auxiliary drive train is active. The main functional unit is supplied with temporarily stored energy from the storage device in order to hydraulically drive the main functional unit. The third operating mode can, for example, enable a cleaning process of the construction machine in which the auxiliary functional unit and the main functional unit are moved with little stress - i.e. in particular without conveying construction and / or thick material - in order to promote wetting of their surfaces with flushing fluid as far as possible. The construction machine also has a fourth operating mode. In the fourth operating mode, the hydraulic displacement machine is in its pumping mode, while the main drive train and the auxiliary drive train are active.The fourth operating mode can enable a boost function of the construction machine, according to which drive energy is supplied to the main functional unit, in addition to the main drive device, at least temporarily by means of the hydraulic displacement machine in pump mode. As already mentioned, the construction machine can be switched between its operating modes depending on the situation, in particular via the machine control system.

[0019] In a further embodiment of the invention, the construction machine has an additional drive train with at least one additional functional unit. The additional drive train is drive-connected or can be drive-connected to the main drive device. Such an additional functional unit can be an adjustable discharge arm and / or an adjustable support device of the construction machine.

[0020] In a further embodiment of the invention, the main drive device and the main functional unit are mechanically and / or hydraulically connected to one another.

[0021] In a further embodiment of the invention, the hydraulic displacement machine is designed as an axial piston machine with a constant or variable piston stroke. The hydraulic displacement machine can alternatively be designed as a rotary piston machine, for example in the form of a gear pump or a vane pump or the like. Alternatively or additionally, the main drive train and / or the auxiliary drive train has an axial piston machine with a constant or variable piston stroke or a rotary piston machine, for example in the form of a gear pump or a vane pump or the like. The axial piston machine or the rotary piston machine of the main drive train and / or the auxiliary drive train is hydraulically connected to the hydraulic displacement machine by means of the hydraulic line.The rotary piston machine of the main drive train and / or the auxiliary drive train is, in particular, designed separately from the hydraulic displacement machine. If the main drive train and / or the auxiliary drive train has an axial piston machine with variable piston stroke, this axial piston machine can be operated at least in two-quadrant operation. Two-quadrant operation enables the axial piston machine in question to be operated either as a hydraulic motor or as a hydraulic pump, so that the axial piston machine in question can have both motor operation and pump operation. This can mean, in particular, that the torque is optionally reversible with the same direction of rotation. In a further embodiment of the invention, the storage device is designed to temporarily store energy from an external electrical mains connection. The mains connection can be arranged on an electrical construction site power distribution board.In this way, the construction machine can be implemented as a plug-in hybrid. Alternatively or additionally, an electric motor of the construction machine, in particular the electric motor of the storage device, is drive-connected to the hydraulic displacement machine, wherein the electric motor is configured to draw energy from the external grid connection. In this way, the construction machine can be operated situationally in any of its operating states, even if the current charge level of the storage device is low, in particular too low to drive all functional units simultaneously.

[0022] Further advantages and features of the invention will become apparent from the claims and the following description of a preferred embodiment of the invention, which is illustrated with reference to the drawings. Like reference numerals refer to like, similar, or functionally identical components.

[0023] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0024] Fig. 1 shows a rough schematic structure of an embodiment of a construction machine according to the invention, and

[0025] Fig. 2 shows in a table exemplary possible operating modes of the construction machine according to the invention.

[0026] A construction machine 1 according to the invention is configured, for example, for construction and / or conveying thick materials. The construction machine 1 has a main drive train 2. The main drive train 2 comprises a main drive device 3. The main drive device 3 can comprise an internal combustion engine. Furthermore, the main drive train 2 comprises a main functional unit 4. The main drive device 3 and the main functional unit 4 are drive-connectable or drive-connected to one another. The illustration in Fig. 1 can be interpreted as a circuit diagram.

[0027] The construction machine 1 also has an auxiliary drive train 5. The auxiliary drive train 5 has at least one hydraulically driven auxiliary functional unit 6. The construction machine 1 further comprises a hydraulic displacement machine 7 with motor operation and with pump operation. In its motor operation, the hydraulic displacement machine 7 can be operated as a hydraulic motor, i.e., it can generate kinetic energy. In its pump operation, the hydraulic displacement machine 7 can be operated as a hydraulic pump, i.e., it can pump hydraulic fluid to provide a hydraulic operating pressure.

[0028] The construction machine 1 further comprises a storage device 8 for temporarily storing energy. The storage device 8 is configured to temporarily store energy generated by the hydraulic displacement machine 7 during its motor operation. When the hydraulic displacement machine 7 is operated in its motor operation, the energy generated can be supplied to the storage device 8, so that the energy is temporarily stored in the storage device 8 during a charging process.

[0029] The construction machine 1 also has a hydraulic line 9. The hydraulic line 9 can be part of a hydraulic circuit of the construction machine 1. The hydraulic line 9 can carry hydraulic fluid. The hydraulic line 9 serves to hydraulically connect the hydraulic displacement machine 7 and the main drive train 2 and the auxiliary drive train 5 to one another. The hydraulic displacement machine 7 is thus, on the one hand, drive-connected or drive-connectable to the main drive train 2 and, on the other hand, to the auxiliary drive train 5. The at least one auxiliary functional unit 6 can be hydraulically driven independently of the main functional unit 4 when the hydraulic displacement machine 7 is in its pumping mode.In this case, the at least one auxiliary functional unit 6 can be supplied with temporarily stored energy from the storage device 8 via the hydraulic line 9 by means of the hydraulic displacement machine 7 in pumping mode. Alternatively or additionally, the auxiliary functional unit 6 can be hydraulically driven independently of the main drive device 3 by supplying the at least one auxiliary functional unit 6 with temporarily stored energy from the storage device 8 via the hydraulic line 9 by means of the hydraulic displacement machine 7 in pumping mode.

[0030] For example, the storage device 8 comprises an electrical energy storage device 10 and an electrical machine 11 drive-connected to the hydraulic displacement machine 7. The electrical machine 11 has a generator mode and a motor mode. The electrical machine 11 can therefore be operated as an electrical generator to generate electrical energy. The electrical machine 11 can also be operated as an electric motor to generate kinetic energy. The electrical energy storage device 10 is electrically connected to the electrical machine 11. In this way, the electrical energy storage device 10 can be charged with electrical energy that the electrical machine 11 generates in its generator mode.Conversely, the electrical energy storage device 10 can supply the electrical machine 11 with temporarily stored electrical energy in a discharge process in order to electrically drive the electrical machine 11 in its motor mode. In motor mode, the electrical machine 11 is supplied with temporarily stored energy from the storage device 8 in order to drive the hydraulic displacement machine 7. Conversely, in its generator mode, the electrical machine 11 can be driven by the hydraulic displacement machine 7 in its motor mode in order to charge the storage device 8 with electrical energy. To temporarily store energy, the electrical energy storage device 10 is therefore charged with electrical energy, for example. The electrical energy storage device 10 can be discharged when temporarily stored energy is withdrawn from the storage device 8.The electrical energy storage device 10 can comprise an electrical capacitor and / or an electrochemical accumulator. Alternatively or additionally, the storage device 8 can comprise a mechanical energy storage device, for example in the form of a flywheel accumulator. Alternatively or additionally, the storage device 8 can comprise a hydraulic and / or pneumatic energy storage device, for example a hydraulic accumulator and / or a pressure accumulator.

[0031] The storage device 8 is configured, for example, to temporarily store electrical energy from an external electrical grid connection. The external electrical grid connection can be arranged on a construction site electrical distribution board. Alternatively or additionally, the electrical machine 11, which is drive-connected to the hydraulic displacement machine 7, can be configured to draw energy from the external electrical grid connection.

[0032] The main functional unit 4 of the construction machine 1 comprises, for example, a construction and / or high-density material pumping unit 12. The construction and / or high-density material pumping unit 12 serves to pump construction and / or high-density material. The construction and / or high-density material pumping unit 12 can have delivery cylinders with variable-volume delivery chambers. To change the volumes of the delivery chambers, in particular in opposite directions, the delivery cylinders can each have an adjustable delivery piston. The construction and / or high-density material pumping unit 12 can also comprise an S-shaped pipe switch, in particular with an S-pipe, which is fluidly connected at one end to a pressure port acting as a pump outlet. The pipe switch can be arranged in a storage chamber that can be filled with construction and / or high-density material from above for storing construction and / or high-density material. The pipe switch can be rotatably mounted at one end on the pressure port within the storage chamber.The volume-variable conveying chambers can open into the storage chamber. The pipe switch can be pivoted relative to the conveying chambers in the storage chamber such that it can be alternately connected in a fluid-conducting manner to one of the conveying chambers. In this way, due to the counteraction of the pivoting of the pipe switch and a change in volume of the conveying chambers, construction and / or thick material located in the storage chamber can be alternately sucked in by means of the conveying chambers and pumped out via the conveying chambers, through the pipe switch and via the pressure nozzle. An agitator 13 of the construction machine 1 can be arranged in the storage chamber of the construction and / or thick material pumping unit 12. The agitator 13 is, for example, a component of at least one auxiliary functional unit 6 of the construction machine 1. The agitator 13 serves to mix the construction and / or thick material to be conveyed.In this respect, the agitator 13 can fulfill an auxiliary function of the construction machine 1, which corresponds to the throughput of construction and / or thick material to be conveyed.

[0033] According to Fig. 1, the construction machine 1 has additional auxiliary functional units 6. The construction machine 1 has, for example, a flushing water pump 17, which forms a further auxiliary functional unit 6 of the construction machine 1. The flushing water pump 17 can be designed to pump flushing fluid for a flushing process, in particular for cleaning the construction machine 1. The flushing fluid can be water.

[0034] A high-pressure pump 18, for example, forms a further auxiliary functional unit 6 of the construction machine 1. The high-pressure pump 18 can be used to pump a cleaning agent, in particular in the form of water, for high-pressure cleaning of the construction machine 1.

[0035] The construction machine 1 includes, for example, an air compressor 19, which can form a further auxiliary functional unit 6 of the construction machine 1. The air compressor 19 can serve to provide compressed air that can be used to operate various equipment and / or to supply the pneumatic energy storage device, if present.

[0036] The construction machine 1 according to Fig. 1 further has a cable drum 20, which forms a further auxiliary functional unit 6 of the construction machine 1. The cable drum 20 can be driven in order to unwind or wind up a cable stored or storable on the cable drum 20. The cable can be used to connect the construction machine 1 to the construction site power distributor. The construction site power distributor can be present at a construction site on which the construction machine 1 is used. The construction machine 1 has, for example, at least one hydraulic cylinder 21, according to Fig. 1 two hydraulic cylinders 21. The hydraulic cylinder 21 is designed to adjust a lowering magazine of the construction machine 1. The at least one hydraulic cylinder 21 of the construction machine 1 can form a further auxiliary functional unit 6 of the construction machine 1.

[0037] The construction machine 1 according to the embodiment shown has at least four operating modes in which the construction machine 1 can be operated in a switchable manner depending on the situation. The operating modes are explained below.

[0038] In a first operating mode of the construction machine 1, the hydraulic displacement machine 7 is in its motor mode. Thus, in the first operating mode, the hydraulic displacement machine 7 can drive the electric machine 11, which is in its generator mode, to charge the electrical energy storage unit 10 of the storage device 8 with electrical energy. In the first operating mode, both the main drive train 2 and the auxiliary drive train 5 are active.

[0039] In a second operating mode of the construction machine 1, the main drive train 2 is inactive and the auxiliary drive train 5 is active. In the second operating mode, the at least one auxiliary functional unit 6 is operated, whereas the main functional unit 4 is inactive. In the second operating mode, the hydraulic displacement machine 7 is in pumping mode. The hydraulic displacement machine 7 thus pumps hydraulic fluid through the hydraulic line 9. In the second operating mode, the auxiliary functional unit 6 is supplied with temporarily stored energy from the storage device 8 via the hydraulic line 9 by means of the hydraulic displacement machine 7 in pumping mode. In this way, the auxiliary functional unit 6 is hydraulically driven in the second operating mode, specifically consuming energy from the storage device 8. The construction machine 1 can have a control device that regulates a charge level of the storage device 8.Such a control device may, for example, comprise a charge controller or a pressure controller.

[0040] In this case, the main functional unit 4 can be supplied with temporarily stored energy from the storage device 8 via the hydraulic line 9 by means of the hydraulic displacement machine 7 in pumping mode. In this way, the main functional unit 4 can be driven hydraulically, in particular independently or in a supporting capacity. For example, a flushing process of the construction and / or thick matter pumping unit 12 can be implemented in this way, in which the construction and / or thick matter pumping unit 12 is driven independently - i.e. when the main drive device 3 is inactive - with low resistance or low load compared to conveying mode by means of the hydraulic displacement machine 7, in particular and by means of the electric machine 11. However, the hydraulic displacement machine 7 can also drive the construction and / or thick matter pumping unit 12 in addition to the main drive device 3 in its pumping mode in order to implement a boost function of the construction machine 1.According to this boost function, the construction and / or thick matter pumping unit 12 can be supplied with more drive energy, at least for a short time, than can be generated by the main drive device 3.

[0041] The construction machine 1, for example, has a third operating mode. In the third operating mode, the main drive device 3 is deactivated. The auxiliary drive train 5 is active in the third operating mode. In the third operating mode, the main functional unit 4 is supplied with temporarily stored energy from the storage device 8 to hydraulically drive the main functional unit 4. In this way, the flushing process explained above can be implemented.

[0042] For example, construction machine 1 has a fourth operating mode. In the fourth operating mode, hydraulic displacement machine 7 is in pumping mode. In the fourth operating mode, the main drive train 2 and the auxiliary drive train 5 are active. This enables the implementation of the boost function mentioned above.

[0043] In the present case, the construction machine 1 further has an additional drive train 14. The drive train 14 comprises at least one additional functional unit 15. For example, two such additional functional units 15 are present. Firstly, the construction machine 1 has a discharge arm 22, which can be adjustable. The discharge arm 22 can form one of the additional functional units 15. Secondly, the construction machine 1 has, for example, a support device 23. The support device 23 can be designed to support the construction machine 1 against a ground, in particular to counteract the construction machine 1 from tipping over. The support device 23 can, as shown in Fig. 1, form a further additional functional unit 15 of the construction machine 1. In addition, the construction machine 1 in the present case has a drivable or driven axle, which drives at least two wheels for transmitting drive power to the ground.The wheels driven thereby can form a further additional functional unit 15 of the construction machine 1. Accordingly, the construction machine 1 is designed here as a self-propelled work machine, in particular as a truck-mounted concrete pump.

[0044] The auxiliary functions of the construction machine 1 that can be fulfilled by the auxiliary functional units 6 can be, for example: a rotary movement of the agitator 13, an operation of the high-pressure water pump 18, an operation of the air compressor 19, an operation of at least the hydraulic cylinder 21 for adjusting the lowering magazine.

[0045] The main drive device 3 and the main functional unit 4 can be mechanically and / or hydraulically connected to each other. In the embodiment shown, the main drive device 3 is hydraulically connected to the main functional unit 4 in sections and mechanically connected to the main functional unit 4 in sections.

[0046] In this case, the hydraulic displacement machine 7 is designed as an axial piston machine 16. The axial piston machine 16 can have a constant or variable piston stroke. Alternatively or additionally, the main drive train 2 and / or the auxiliary drive train 5 can have an axial piston machine 16 with a constant or variable piston stroke. The axial piston machine 16 of the main drive train 2 and / or the auxiliary drive train 5 can be hydraulically connected to the hydraulic displacement machine 7 via the hydraulic line 9.

[0047] Instead of the axial piston machine 16, in other embodiments of the construction machine 1, a rotary piston machine, for example in the form of a gear pump or a vane pump or the like, can be provided for the positive displacement machine 7. In these or other embodiments, a rotary piston machine, for example in the form of a gear pump or a vane pump or the like, can be provided instead of the axial piston machine 16 of the main drive train 2 and / or the auxiliary drive train 5. The axial piston machine 16 or the rotary piston machine of the main drive train 2 and / or the auxiliary drive train 5 can be designed separately from the positive displacement machine 7.

[0048] The construction machine 1 according to the invention can be operated according to the operating modes tabulated in Fig. 2. Accordingly, the construction machine 1 can be controlled, in particular by means of its machine control system, such that the storage device 8 is charged while the main drive device 3 is active. A predetermined charge level of the storage device 8 can then be maintained.

[0049] The machine control system of the construction machine 1 can detect a state in which the main drive device 3 is active even though the main functional unit 4 is inactive. If this state is detected, the machine control system can send a signal to the main drive device 3 to deactivate the main drive device 3. If there is construction and / or thick material in the storage space of the construction and / or thick material pumping unit 12 of the main functional unit 4, the agitator 13 can be driven as an auxiliary functional unit 6 by the hydraulic displacement machine 7 and the electric machine 11, as long as the main drive device 3 is switched off.

[0050] If another auxiliary functional unit 6 is activated while the main drive device 3 is inactive, the further auxiliary functional unit 6 can also be driven via the hydraulic displacement machine 7 and the electric machine 11.

[0051] As soon as the main functional unit 4 is reactivated, the machine control system can send a signal to the main drive device 3 to reactivate the main drive device 3. The signal to reactivate the main drive device 3 can also be sent, for example, when the storage device 8 falls below a predetermined charge level.

Claims

Patent claims 1. Construction machine (1), in particular for construction and / or thick material conveying, comprising a main drive train (2) which has a main drive device (3) and a main functional unit (4), wherein the main drive device (3) and the main functional unit (4) are drive-connectable to one another orare drive-connected, an auxiliary drive train (5) which has at least one hydraulically drivable auxiliary functional unit (6), a hydraulic displacement machine (7) with motor operation and with pump operation, a storage device (8) for temporarily storing energy which the hydraulic displacement machine (7) generates in its motor operation, and a hydraulic line (9) for hydraulically driving the hydraulic displacement machine (7) and the main drive train (2) and the auxiliary drive train (5) to one another, wherein the at least one auxiliary functional unit (6) can be supplied with temporarily stored energy from the storage device (8) via the hydraulic line (9) by means of the hydraulic displacement machine (7) in pump operation in order to hydraulically drive the at least one auxiliary functional unit (6) independently of the main functional unit (4) and / or independently of the main drive device (3).

2. Construction machine (1) according to claim 1, characterized in that the storage device (8) has an electrical energy store (10) and an electrical machine (11) with generator operation and with motor operation, which is drive-connected to the hydraulic displacement machine (7), wherein the electrical energy store (10) is electrically connected to the electrical machine (11), and / or that the storage device (8) has a mechanical, hydraulic and / or pneumatic energy store.

3. Construction machine (1) according to one of the preceding claims, characterized in that the main functional unit (4) has a construction and / or thick material pumping unit (12) for conveying construction and / or thick material, and the auxiliary functional unit (6) has an agitator (13) for mixing the construction and / or thick material to be conveyed.

4. Construction machine (1) according to one of the preceding claims, characterized in that the construction machine (1) has a first operating mode in which the main drive train (2) - when the hydraulic displacement machine (7) is in motor operation - and the auxiliary drive train (5) are active, and the construction machine (1) has a second operating mode in which the main drive train (2) is inactive and the auxiliary drive train (5) is active, wherein the auxiliary functional unit (6) is supplied with temporarily stored energy from the storage device (8) via the hydraulic line (9) by means of the hydraulic displacement machine (7) in pump operation in order to hydraulically drive the auxiliary functional unit (6).

5. Construction machine (1) according to one of the preceding claims, characterized in that the main functional unit (4) can be supplied with temporarily stored energy from the storage device (8) via the hydraulic line (9) by means of the hydraulic displacement machine (7) in pumping operation in order to hydraulically drive the main functional unit (4), in particular independently or in a supporting manner.

6. Construction machine (1) according to claims 4 and 5, characterized in that the construction machine (1) has a third operating mode in which the main drive device (3) is deactivated and the auxiliary drive train (5) is active, wherein the main functional unit (4) is supplied with temporarily stored energy from the storage device (8) in order to hydraulically drive the main functional unit (4), and the construction machine (1) has a fourth operating mode in which the main drive train (2) - with the hydraulic displacement machine (7) in pumping operation - and the auxiliary drive train (6) are active.

7. Construction machine (1) according to one of the preceding claims, characterized in that the construction machine (1) has an additional drive train (14) with at least one additional functional unit (15), wherein the additional drive train (14) is drive-connected or can be drive-connected to the main drive device (3).

8. Construction machine (1) according to one of the preceding claims, characterized in that the main drive device (3) and the main functional unit (4) are mechanically and / or hydraulically connected to one another.

9. Construction machine (1) according to one of the preceding claims, characterized in that the hydraulic displacement machine (7) is designed as an axial piston machine (16) with a constant or variable piston stroke or as a rotary piston machine, and / or that the main drive train (2) and / or the auxiliary drive train (5) has an axial piston machine (16) with a constant or variable piston stroke or a rotary piston machine, which is hydraulically drive-connected to the hydraulic displacement machine (7) by means of the hydraulic line (9).

10. Construction machine (1) according to one of the preceding claims, characterized in that the storage device (8) is configured for temporarily storing energy from an external electrical mains connection; and / or that an electrical machine (11) of the construction machine (1), in particular of the storage device (8), which is drive-connected to the hydraulic displacement machine (7), is configured to draw energy from the external electrical mains connection.

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