Electrical drive device for electrically driving an auto concrete pump, auto concrete pump and system for driving an auto concrete pump

Abstract

The invention relates to an electrical drive device (200), for electrically driving an auto concrete pump (100), wherein the auto concrete pump has a concrete pump system (110) for conveying concrete, wherein the concrete pump system (110) of the auto concrete pump (100) can be driven by a hydraulic pump drive system (210) having at least one hydraulic pump (211a-d). The electrical drive device has at least one electric motor (201) and at least two network connection interfaces (202), via which the at least one electric motor (201) is supplied with electrical power, wherein the at least one electric motor (201) is designed to drive the hydraulic pump drive system (210). The object of the invention is to safely provide the electrical drive device with a total power of at least 60 kW in an electrically isolated manner via the at least two network connections (202) and to be able to easily connect said drive device to the auto concrete pump or integrate it into same. According to the invention, the network connection interfaces (202) are each assigned at least one network connection module (203), wherein the network connection modules (203) each have at least one primary switched-mode power supply (220) and a DC intermediate circuit (204), via which the at least one electric motor (201) is connected. The invention also relates to an auto concrete pump (100) that can be driven using said electrical drive device (200) and a system for electrically driving an auto concrete pump (100).

Description

[0001] Electric drive device for the electric drive of a truck-mounted concrete pump, truck-mounted concrete pump and system for driving a truck-mounted concrete pump

[0002] The invention relates to an electric drive device for the electric drive of a truck-mounted concrete pump, wherein the truck-mounted concrete pump has a concrete pumping system for conveying concrete, wherein the concrete pumping system of the truck-mounted concrete pump can be driven by a hydraulic pump drive system comprising at least one hydraulic pump. The electric drive device has at least one electric motor and at least two mains connection interfaces via which the at least one electric motor is supplied with electrical energy, wherein the at least one electric motor is configured to drive the hydraulic pump drive system.

[0003] To reduce the emission of unwanted exhaust gases and climate-damaging carbon dioxide, it is desirable to electrically drive truck-mounted concrete pumps, whose hydraulic drive system is usually powered by an internal combustion engine, on the construction site. The internal combustion engine is usually also used to drive a carrier vehicle on which the truck-mounted concrete pump is mounted. For example, patent application DE 10 2021 100 204 A1 proposes, in addition to the conventional diesel-hydraulic drive of the truck-mounted concrete pump hydraulic drive system, to provide an additional electric motor.

[0004] The hydraulic pump drive system can then be driven by the electric motor or the combustion engine. The electric motor described there should ideally have an output of 130 kW.

[0005] The hydraulic pump drive system is normally designed for drive with an internal combustion engine with an output of approximately 200 kW or more. The internal combustion engine for the travel drive of a truck-mounted concrete pump can usually provide this power to drive the concrete pump today. However, the power available at a single grid connection interface for the electric drive of the truck-mounted concrete pump is generally limited to a maximum of 75 kW (125 A). This is due, on the one hand, to the limited capacities of the local network stations in the power supply grid and, on the other hand, to the limited capacities of the individual spur lines leading from the local network station to supply the connected consumers. DE 10 2021 100 204 A1 therefore proposes providing multiple grid connections for the electric drive of a truck-mounted concrete pump.However, if these multiple network connections are supplied via different spur lines and / or different local network stations, the circuits must be galvanically decoupled.

[0006] In the case of mobile systems that are additionally operated with an energy storage device (battery) that is charged by a grid feed-in and / or by which the system is supported in terms of power, the capacities of the energy storage device to the electrical earthing potential when connecting the power supply lines of the machine also result in leakage currents that can trigger the grid-side protective devices, residual current circuit breakers, etc.

[0007] To prevent these leakage currents, it is also necessary to provide galvanic isolation between the grid connection (or connections) and the energy storage device. According to the state of the art, galvanic isolation is typically achieved using an isolating transformer. For example, patent application DE 10 2020 215 491 A1 describes a power supply device for a construction machine that is supplied with electrical energy via two grid connections. It proposes galvanically isolating one of the two grid connections using a grid isolating transformer.

[0008] As described above, the electric drive of a truck-mounted concrete pump requires a very high electrical connection rating of at least 60 kW; an even higher connection rating of 200 kW is ideal. Today's construction site power connections are available with CEE sockets with a maximum rating of 63 or 125 A, which corresponds to an electrical output of approximately 37.5 kW (63 A) or 75 kW (125 A).

[0009] Mains isolating transformers designed for such power outputs are extremely large and very heavy. For a connected load of 75 kW, two isolating transformers, each weighing several hundred kilograms, would be required. For mobile applications of this generic electric drive device, galvanic isolation using mains isolating transformers is therefore technically unfeasible due to the limited space available and the limitations of the possible payload.

[0010] It is therefore an object of the invention to further develop the electric drive device for operating a truck-mounted concrete pump in such a way that it can be safely supplied with a total power of at least 60 kW in a galvanically decoupled manner via the at least two mains connections from different circuits and can be connected to the truck-mounted concrete pump or integrated into it in a particularly simple manner.

[0011] To this end, the invention proposes, starting from an electric drive device of the type mentioned at the outset, that at least one mains connection module is assigned to each of the mains connection interfaces, wherein the mains connection modules each have at least one primary-switched power supply and feed a DC intermediate circuit via which at least one electric motor is connected. The galvanic decoupling of the mains connections is achieved by means of the switched-mode power supplies. The decoupling in the power branch of the switched-mode power supply takes place in a power transmitter, usually a transformer, in which the high-frequency clocked input voltage is transmitted. The internal control components of the switched-mode power supply must also be galvanically decoupled from the output by potential separation. For this purpose, an optocoupler is preferably provided in the switched-mode power supplies.Alternatively, the switching signals can be transmitted to the switches of the switching power supply via auxiliary transformers in order to achieve potential isolation.

[0012] Switching power supplies are used to implement galvanic isolation from the mains supply and to supply the DC link and thus the electric motor with electrical energy. Due to the high frequencies, switching power supplies are lighter and smaller overall than the mains isolation transformers used in the prior art.

[0013] The electric drive device according to the invention can either be integrated into the truck-mounted concrete pump or be designed as an external electric drive device.

[0014] In particular, if the electric drive device is designed as an external drive device and an electric motor is used to drive a separate external hydraulic pump drive system to drive the concrete pumping system of the truck-mounted concrete pump, a conventional truck-mounted concrete pump, which is usually powered by the internal combustion engine of the carrier vehicle, can be very easily electrically driven on a construction site. Only very minor modifications are necessary to the truck-mounted concrete pump to enable electric operation. The hydraulic pump drive system driven by an electric motor can be designed to be driven by the electric motor, which generally has a lower power output than the internal combustion engine, in order to minimize power losses and optimize the electric drive device for the electric drive of the truck-mounted concrete pump.A preferred development of the invention provides that at least one of the mains connection modules has two or more primary-switched power supplies connected in parallel. Due to the high power requirements of the electric motor for driving the motor, it is advantageous to connect several galvanically isolated power supplies in parallel for each mains connection. This allows the use of switching power supplies with lower power output. Such switching power supplies are used as mass products, for example, in the field of electromobility, and are therefore cost-effective and standardized.

[0015] A particularly preferred development of the invention provides for an electric accumulator connected to the intermediate circuit. The accumulator can be charged when excess power is available or the electric motor is not in use. The accumulator can provide temporary support during full-load operation of the electric motor and make the stored energy available. Thus, the use of an accumulator smooths the overall load curve. The use of switched-mode power supplies offers the further advantage that both the electric motor and the accumulator can be powered via the DC intermediate circuit.

[0016] In a practical embodiment, the hydraulic pumps of the hydraulic pump drive system are driven by a single electric motor. The electric motor drives all hydraulic pumps via a hydraulic pump train. This type of drive is also typically used when an internal combustion engine is used. The pumps not in use then run at idle.

[0017] An alternative, expedient embodiment provides for at least two electric motors to drive the hydraulic pumps of the hydraulic pump drive system, wherein the electric motors can be controlled separately and are each connected via the intermediate circuit. The separate drive allows idle times to be avoided and thus energy to be saved. The invention further comprises a truck-mounted concrete pump having the hydraulically driven concrete pump system for conveying concrete, a hydraulic pump arrangement, and an internal combustion engine. The internal combustion engine is designed to drive a truck-mounted concrete pump hydraulic pump drive system, and the truck-mounted concrete pump hydraulic pump drive system is designed to drive the concrete pump system. The concrete pump system of the truck-mounted concrete pump can be driven by the electric drive device according to the invention.

[0018] Preferably, the truck-mounted concrete pump

[0019] The hydraulic pump drive system of the truck-mounted concrete pump has a plurality of hydraulic pumps, and the concrete pumping system of the truck-mounted concrete pump has a plurality of hydraulic consumers. The hydraulic pump drive system of the electric drive device has a plurality of hydraulic pumps, and the hydraulic consumers of the truck-mounted concrete pump can be connected to the plurality of hydraulic pumps of the electric drive device via a plurality of hydraulic supply lines. The hydraulic supply lines allow the hydraulic consumers of the truck-mounted concrete pump to be easily connected to the hydraulic pumps of the hydraulic pump drive system.

[0020] Advantageously, the truck-mounted concrete pump can comprise a hydraulic pump drive system with at least one hydraulic pump for driving the concrete pumping system, as well as the electric drive device for driving the hydraulic pump drive system of the truck-mounted concrete pump. Thus, all components for the electric or electro-hydraulic drive of the truck-mounted concrete pump 100 are arranged on the truck-mounted concrete pump 100, and the truck-mounted concrete pump 100 can be put into operation with the combustion engine switched off without setting up and connecting an additional unit on the construction site.

[0021] The invention is further characterized by a system for electrically driving a truck-mounted concrete pump, wherein the truck-mounted concrete pump comprises a hydraulically driven concrete pumping system for conveying concrete and a truck-mounted concrete pump hydraulic pump drive system and a

[0022] Internal combustion engine, wherein the internal combustion engine is designed to drive the truck-mounted concrete hydraulic pump drive system and the truck-mounted concrete hydraulic pump drive system is designed to drive the concrete pumping system, wherein an electric drive device according to the invention has a hydraulic pump drive system for hydraulically driving the concrete pumping system of the truck-mounted concrete pump and an electric motor for driving the hydraulic pump drive system, wherein the hydraulic pump drive system of the electric drive device is connected to the concrete pumping system of the truck-mounted concrete pump via hydraulic supply lines.

[0023] Advantageously, the truck-mounted concrete pump

[0024] Hydraulic pump drive system according to the invention has a plurality of hydraulic pumps and the concrete pumping system of the truck-mounted concrete pump has a plurality of hydraulic consumers and the hydraulic pump drive system of the electric drive device has a plurality of hydraulic pumps and the hydraulic consumers of the concrete pumping system are connectable to the plurality of hydraulic pumps of the electric drive device via a plurality of hydraulic supply lines.

[0025] A more detailed description of the hydraulic structure of the system according to the invention can be found in the international patent application of the present applicant dated July 4, 2022, with the file number PCT / EP 2022 / 068446, which was not yet published at the time of this application, in Figures 1-4 therein and the associated description (page 8, line 18 - page 21, line 28). This description is expressly incorporated herein by reference and is therefore incorporated into the present disclosure.

[0026] Further features, details, and advantages of the invention will become apparent from the following description and from the drawings, which show exemplary embodiments of the invention. Corresponding objects or elements are provided with the same reference numerals in all figures.

[0027] In the following, exemplary embodiments of the invention are explained in more detail with reference to the drawings. They show:

[0028] Figure 1: schematically shows a system according to the invention in a first embodiment;

[0029] Figure 2: schematically shows the detailed structure of a switching power supply of an electric drive device according to the invention;

[0030] Figure 3: schematically shows a block diagram of an electric drive device according to the invention in a further embodiment;

[0031] Figure 4: schematically a block diagram of an inventive

[0032] Systems in a further embodiment;

[0033] Figure 5: schematically shows a block diagram of a system according to the invention in a further embodiment.

[0034] Figure 1 shows a system according to the invention with a truck-mounted concrete pump 100 connected to an electric drive device 200 according to the invention.

[0035] The truck-mounted concrete pump 100 comprises a hydraulically driven concrete pumping system 110 for conveying concrete and a truck-mounted concrete pump hydraulic pump drive system (not shown here), which can be driven by an internal combustion engine (also not shown), which also serves to drive the carrier vehicle, and is designed to drive the concrete pumping system 110.

[0036] The concrete pumping system 110 is mounted on a truck chassis 130 with a driver's cab. The concrete pumping system 110 includes various hydraulic consumers 111, 112, 113, 114, 115, for example, an agitator 111 for mixing the fresh concrete in the hopper 116, a two-cylinder piston pump 114, for example, consisting of delivery cylinders driven by differential hydraulic cylinders, and a concrete changeover valve 112. Instead of a two-cylinder piston pump 114, another pumping technology could also be used, for example, a rotor hose pump. Further hydraulic consumers of the concrete pumping system 110 are, for example, a support 113 and a concrete placing boom 115. The truck-mounted concrete pump 100 could additionally be equipped with a hydraulically driven mixing drum (truck mixer concrete pump) or, for example, be designed as a simple concrete pump mounted on a truck chassis without a boom and support.

[0037] Furthermore, an electric drive device 200 according to the invention is shown, which electrically drives the truck-mounted concrete pump 100 by driving a further hydraulic pump drive system 210, which has a plurality of hydraulic pumps 211a-d. The hydraulic consumers 111, 112, 113, 114, 115 of the concrete pumping system 110 can be driven via the hydraulic supply lines 101a-d by means of the hydraulic pumps 211a-d. The hydraulic pumps 211a-d draw the hydraulic oil for driving the concrete pumping system 110 from a hydraulic oil tank 212 of the hydraulic pump drive system. The hydraulic oil tank 212 of the hydraulic pump drive system 210 can be connected to a further hydraulic oil tank (not shown here) of the truck-mounted concrete pump 100.

[0038] The electric drive device 200 has two mains connection interfaces in the form of plugs 202, each of which is assigned a mains connection module 203, which are designed as primary-switched power supplies 220, via the plugs 202. The electrical energy supply device 200 can be connected to the supply network via the plugs 202, for example, via a construction site power distributor 300. A DC intermediate circuit 204 is fed via the mains connection modules 203. The electric motor 201 is connected to the DC intermediate circuit 204 via an inverter 205 and a power line 206. The electrical energy supply device 200 can, for example, additionally comprise an accumulator 207, which, depending on the capacity of the accumulator 207, can drive the electric motor 201 alone for a certain period of time or provide additional power in addition to the construction site power to support the concrete pumping system 110 during power peaks.The accumulator 207 can, for example, be charged by the construction site power distributor 300 via an electrical power distribution unit (not shown here) during pumping breaks or phases of low power demand of the concrete pumping system 110. The capacity of the accumulator 207 could also be so large that the construction site power connection 300 can be dispensed with entirely. Alternatively or in addition to the accumulator 207, a fuel cell could be used. The accumulator 207 can, for example, also be arranged outside the electric drive device 200. The construction site power distributor 300 could also be supplemented by a fuel cell or an electrical accumulator, for example to supply the entire construction site. In addition to or alternatively to the accumulator 207, the electric drive device 200 could have a supercapacitor to bridge short-term power peaks.

[0039] Figure 1 shows the electric drive device 200 separately for the electro-hydraulic drive of a truck-mounted concrete pump 100 conventionally equipped with a combustion engine, which is arranged spatially next to the truck-mounted concrete pump 100, for example, on a transport trailer or a transport vehicle. Also arranged on this transport vehicle or trailer is the hydraulic pump drive system 210 with the hydraulic pumps 211a-d, driven by the electric drive device 200.

[0040] In this exemplary embodiment, the truck-mounted concrete pump 100 has, for example, a return drive motor and at least one return hydraulic pump driven by the return drive motor, wherein the return hydraulic pump conveys hydraulic oil from the hydraulic oil tank of the truck-mounted concrete pump 100 to the hydraulic oil tank 212 of the external hydraulic pump drive system 210. Because the hydraulic oil required to drive the concrete pump system 110 from the hydraulic pump drive system 210 is conveyed or pumped to the external hydraulic pump drive system by a hydraulic oil return pump, a relatively thin pressure hose in the form of the return hose 101e, in contrast to a suction hose, can be used for the return of the hydraulic oil. Due to the large number and power of the hydraulic consumers to be driven by the electric drive device, the hydraulic oil requirement of the hydraulic pumps 211a-d of the hydraulic pump drive system 210 is very high.If, as would be common practice according to the state of the art, the hydraulic oil required by the hydraulic pump drive system 210 were to be drawn from the hydraulic oil tank of the truck-mounted concrete pump 100, the required hydraulic return line 101e would have to have a very large diameter due to the limited oil flow rate of a suction hose. A hydraulic return line 101e with a smaller diameter can also be very easily connected to the truck-mounted concrete pump 100.

[0041] Alternatively, the electric drive device 200 could be arranged on the truck-mounted concrete pump 100, in which case the electric motor 201 of the electric drive device 200 drives the hydraulic pump drive system arranged on the truck-mounted concrete pump 100 with the hydraulic pumps for driving the concrete pumping system 110.

[0042] Figure 2 shows a more detailed block diagram of a switching power supply 220 for use in an electric drive device 200 according to the invention. Regulated switching power supplies deliver constant output voltages or currents. The constancy of the output variable is achieved by controlling the energy flow into the switching power supply 220 and thus for the connected electrical loads—a closed control loop is present.

[0043] A 3-phase AC mains voltage is applied to the input of the switching power supply 220. However, single- or two-phase switching power supplies can also be used. Line-side interference is filtered out via a line filter 221. The AC mains voltage is then rectified and smoothed by a rectifier 222. Furthermore, a switching transistor 223 is shown, which operates in the primary circuit of a connected transformer 224. The switching power supply 220 is therefore primary-switched. A MOSFET, a bipolar transistor, or an IGBT, for example, can be used as the switching transistor 223. However, thyristors are generally used for high-power applications—as in the present case. The transformer 224 of the primary-switched switching power supply 220 is operated at a high frequency, namely the operating frequency of the switching power supply 220, which is typically in the range of 15–300 kHz.Therefore, transformer 224 can be designed accordingly small and lightweight. The DC voltage is "chopped" into a switched voltage with a frequency corresponding to the operating frequency by means of switching transistor 222. Power is transferred via transformer 224, and galvanic isolation between the primary and secondary sides is achieved. A second rectifier 225 is arranged on the secondary side of transformer 224, which rectifies and smooths the high-frequency switching voltage.

[0044] With the help of the control circuit shown, it is ensured that as much energy flows into the switching power supply 220 as is to be made available via the respective switching power supply 220 in the DC link 204. The control required for this can be achieved via pulse width or pulse phase control. The control can be achieved, for example, via an operational amplifier 226, as shown. The galvanic isolation in the control circuit is achieved via an optocoupler 227. The control and monitoring of the switching power supply 220 is then carried out via control electronics 228, for example in the form of a microchip.

[0045] The switching power supply is therefore galvanically isolated from the supply network both in the power section by the transformer 224 and in the control section by the optocoupler 227.

[0046] Figure 3 shows a block diagram of part of the electric drive device 200 in a second exemplary embodiment. In this exemplary embodiment, the mains connection modules 203 each have four switching power supplies 220 connected in parallel. This allows the mains connection modules 203 to absorb a maximum of the sum of the rated current of the individual switching power supplies 220. If the rated current of a switching power supply 220 is, for example, 32 A, 128 A can be transmitted with four switching power supplies, which corresponds to a power of approximately 88 kW for a 400 V three-phase connection. The connected load of a 125 A CEE connection can thus be optimally utilized. A power of 176 kW could thus be fed in via the two mains connection modules. The parallel connection of several switching power supplies 220 means that each of them can be dimensioned smaller.

[0047] Figure 4 shows a block diagram of the electric drive device 200 according to the invention in a further exemplary embodiment. Here, several electric motors 201 ac are assigned to the hydraulic pumps 211a-c of the hydraulic pump drive system 210. The hydraulic pumps 211a-c can thus be controlled and driven separately as needed. This avoids idle times of the hydraulic pumps 211 ac, thus saving energy overall. For example, during the assembly and disassembly of the truck-mounted concrete pump 110, i.e., during the extension of the support 113 and the unfolding of the concrete placing boom 115, only the electric motor 201 b, which drives the hydraulic pump 211 b for the support 113 and the concrete placing boom 115, is in operation. The electric motor 201a, which drives the hydraulic pump 211a for driving the two-cylinder piston pump 114, can remain switched off during this time, thus saving electrical energy during assembly and disassembly.In addition, individual elements, which have previously been hydraulically driven, can also be driven directly by an electric motor 201d. An example of this would be the drive of the agitator 111, which in the embodiment of Figure 1 is driven by the hydraulic pump 211d using a hydraulic motor (not shown). To avoid hydraulic losses, the hydraulic pump 211d was omitted from the embodiment of Figure 4. Instead, an electric motor 201 could drive the agitator directly. Additional electric motors 201 for direct electric drives on the truck-mounted concrete pump 100 could be added, thus eliminating the need for additional loss-prone hydraulic drives. Other combinations of electric motors 201 and hydraulic pumps 211 are conceivable.For example, only one electric motor 201 could be provided to drive one or more hydraulic pumps 211, and further electric motors 201 could be provided for the direct electric drive, for example, of the joints of the concrete placing boom 15. The electric drive device 200 shown in Figure 4 can, as shown in Figure 1, be arranged separately from the truck-mounted concrete pump 100 and connectable to it for driving it, or it can be integrated into the truck-mounted concrete pump 100 to drive the concrete pumping system 110. If the electric drive device 200 is arranged separately from the truck-mounted concrete pump 100, the electric motor(s) 201d are then arranged on the truck-mounted concrete pump 100 for the direct electric drive of components of the concrete pumping system 110.

[0048] Figure 5 shows a block diagram of the electric drive device 200 according to the invention in a further exemplary embodiment. In this case, the electric drive device 200 preferably forms an integral component of the truck-mounted concrete pump 100. The hydraulic pump drive system 210, or the hydraulic pumps 211a-d, can be driven here via the electric motor 201 of the electric drive device 200 and / or via an internal combustion engine 208. The drive of the hydraulic pump drive system 210 via the electric motor 201 or the internal combustion engine 208 is controlled by a transfer case 213. The internal combustion engine 208 is, for example, the internal combustion engine 208 that drives the wheels of the chassis of the truck-mounted concrete pump 100 in driving mode, but it could also be an additional internal combustion engine 208 arranged on the truck-mounted concrete pump 100.The internal combustion engine 208 can be coupled or decoupled from the transfer case 213 via a clutch 229. The internal combustion engine 208 can be connected to the transfer case 213, for example, via the propeller shaft for the drive or via a power take-off (PTO), for example an engine-dependent power take-off (NMV).

[0049] Alternatively, the truck chassis 130 could be powered not by an internal combustion engine, but by an electric motor, and for this purpose, a fuel cell or one or more accumulators for providing electrical drive energy are provided on the truck chassis, for example, which can be integrated into the electric drive device 200 according to the invention, in particular into the DC intermediate circuit 204, for driving the concrete pumping system 110. This is independent of whether the electric drive device 200 is arranged on the truck-mounted concrete pump 100 or, as described in connection with Figure 1, is arranged separately from the truck-mounted concrete pump 100.In this case, it should also be assumed for the future that, in particular, the capacity of batteries alone is not sufficient for prolonged operation of the concrete pumping system 110 and that, therefore, an external electrical power supply for the electric drive device 200 should be available for prolonged pumping operation.

[0050] List of reference symbols:

[0051] 100 truck-mounted concrete pumps

[0052] 101 ae Hydraulic supply return line

[0053] 110 Concrete pumping system

[0054] 111 Agitator

[0055] 112 Concrete switching valve

[0056] 113 Support

[0057] 114 Two-cylinder piston pump

[0058] 115 Concrete placing boom

[0059] 116 filling funnel

[0060] 130 truck chassis

[0061] 200 Electric drive device

[0062] 201 electric motor

[0063] 202 plugs

[0064] 203 Mains connection module

[0065] 204 DC link 205 Inverter

[0066] 206 power line

[0067] 207 Accumulator

[0068] 208 combustion engine

[0069] 210 Hydraulic pump drive system

[0070] 211a-d hydraulic pumps

[0071] 212 Hydraulic oil tank

[0072] 213 transfer case

[0073] 220 switching power supply

[0074] 221 line filter

[0075] 222 first rectifier

[0076] 223 switches

[0077] 224 Transformer

[0078] 225 second rectifier

[0079] 226 operational amplifiers

[0080] 227 optocouplers

[0081] 228 Control

[0082] 229 Clutch

[0083] 300 construction site power distributors

Claims

Patent claims Electric drive device (200) for the electric drive of a Truck-mounted concrete pump (100), wherein the truck-mounted concrete pump (100) has a concrete pumping system (110) for conveying concrete, wherein the concrete pumping system (110) of the truck-mounted concrete pump (100) is driven by a hydraulic pump (211a-d) comprising at least one A hydraulic pump drive system (210) which can be driven, comprising at least one electric motor (201) and at least two mains connection interfaces (202) via which the at least one electric motor (201) is supplied with electrical energy, wherein the at least one electric motor (201) is configured to drive the hydraulic pump drive system (210), characterized in that at least one mains connection module (203) is assigned to each of the mains connection interfaces (202), wherein the mains connection modules (203) each have at least one primary-switched power supply (220) and feed a DC intermediate circuit (204) via which the at least one electric motor (201) is connected. Electric drive device (200) according to claim 1, characterized in that at least one of the mains connection modules (203) has two or more parallel-connected power supplies (220).

3. Electric drive device (200) according to claim 1 or 2, characterized in that an electric accumulator (207) is provided which is connected to the DC intermediate circuit (204).

4. Electric drive device (200) according to one of claims 1-3, characterized in that the at least one hydraulic pump (21 lari) of the hydraulic pump drive system (210) is driven by means of exactly one electric motor (201).

5. Electric drive device (200) according to one of claims 1-3, characterized in that the hydraulic pump drive system (210) comprises at least two hydraulic pumps (211a-d) and at least two electric motors (201) are provided for driving the hydraulic pumps (211a-d) of the hydraulic pump drive system (210), wherein the electric motors (201) are separately controllable and are each connected via the DC intermediate circuit (204).

6. Electric drive device (200) according to one of the preceding claims, characterized in that an internal combustion engine (208) is additionally provided, which can be switched on via a transfer case (213) in addition to or alternatively to the electric motor (201) for driving the hydraulic pump drive system (210).

7. Truck-mounted concrete pump (100), comprising a hydraulically driven concrete pumping system (110) for conveying concrete, characterized in that the concrete pumping system (110) of the truck-mounted concrete pump (100) can be driven by an electric drive device (200) according to one of claims 1-6.

8. Truck-mounted concrete pump (100) according to claim 7, characterized in that the truck-mounted concrete pump (100) is connectable to the electric drive device (200) for driving the concrete pumping system (110). Truck-mounted concrete pump (100) according to claim 7, characterized in that the truck-mounted concrete pump (100) comprises a hydraulic pump drive system (210) with at least one hydraulic pump (211a-d) for driving the concrete pumping system (110) and the electric drive device (200) for driving the hydraulic pump drive system (210) of the truck-mounted concrete pump (100). A system for electrically driving a truck-mounted concrete pump (100) according to one of claims 8 or 9, characterized in that the concrete pumping system (110) of the truck-mounted concrete pump (100) is connectable to the electric drive device (200).

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