Auxiliary power unit and system for electrically driving a truck-mounted concrete pump, and a truck-mounted 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] The invention relates to a truck-mounted concrete pump comprising a hydraulically driven 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, and wherein the concrete pumping system of the truck-mounted concrete pump can be driven by an electric drive device. The electric drive device comprises 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.

[0002] From DE 10 2020 121360 A1 a truck-mounted concrete pump is known which does not have two network connection interfaces.

[0003] EP 3 498 518 A1 discloses a pneumatic conveyor for building materials, comprising a compressed air unit, a building material unit, an electric drive motor unit (in particular, electrically controllable), an electrical grid connection, and a capacitor unit (in particular, electrical). The compressed air unit is designed or intended for generating compressed air. The building material unit is designed or intended for supplying building material.

[0004] To reduce emissions of unwanted exhaust gases and climate-damaging carbon dioxide, it is desirable to electrically power truck-mounted concrete pumps, whose hydraulic pump drive system is typically powered by an internal combustion engine, on the construction site. The internal combustion engine also usually powers a support vehicle on which the truck-mounted concrete pump is mounted. Patent application DE 10 2021 100 204 A1 therefore proposes, for example, to provide an electric motor in addition to the usual diesel-hydraulic drive of the truck-mounted concrete pump's hydraulic pump drive system. The truck-mounted concrete pump's hydraulic pump drive system can then be powered by either the electric motor or the internal combustion engine. The electric motor described therein should ideally have a power output of 130 kW.

[0005] Normally, the hydraulic pump drive system is designed for operation with an internal combustion engine with a power output of approximately 200 kW or more. The internal combustion engine for the drive system of a truck-mounted concrete pump can typically provide this power. However, the power available at a single grid connection point 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 substations in the power grid and, on the other hand, to the limited capacities of the individual branch lines leading from the local substation to supply the connected consumers. Therefore, German patent DE 10 2021 100 204 A1 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 branch lines and / or different local network substations, the circuits must be galvanically decoupled.

[0006] In mobile systems that are additionally operated with an energy storage device (battery) which is charged by a mains supply and / or which provides power support to the system, leakage currents occur due to the capacities of the energy storage device at the electrical earth potential when the machine's power supply lines are connected, which can cause the mains-side protective devices, residual current circuit breakers, etc. to trip.

[0007] To prevent these leakage currents, it is necessary to provide galvanic isolation between the grid connection(s) and the energy storage device. According to current technology, this galvanic isolation is typically achieved using an isolation transformer.

[0008] Patent application DE 10 2020 215 491 A1, for example, describes a power supply device for a construction machine that is supplied with electrical energy via two mains connections. It proposes galvanically decoupling one of the two mains connections using a mains isolation transformer.

[0009] As described above, the electric drive of a truck-mounted concrete pump requires very high electrical connection capacities of at least 60 kW; ideally, a higher connection capacity of 200 kW is required. Current construction site power connections are available with CEE sockets with a maximum of 63 or 125 A, which corresponds to an electrical output of approximately 37.5 kW (63 A) or 75 kW (125 A).

[0010] Line isolation transformers designed for such power outputs are extremely large and very heavy. For a connected load of 75 kW each, two isolation transformers, each weighing several hundred kilograms, would be required. Therefore, for mobile applications of this type of electric drive device, galvanic isolation using line isolation transformers is technically unfeasible due to the limited installation space and the restricted payload capacity.

[0011] It is therefore an object of the invention to further develop the electric drive device of the truck-mounted concrete pump in such a way that it can be galvanically decoupled and safely supplied via the at least two mains connections from different circuits with a total power of at least 60 kW and can be connected to or integrated into the truck-mounted concrete pump in a particularly simple manner.

[0012] The invention proposes that at least one network connection module is assigned to each of the network connection interfaces, wherein the network connection modules each have at least one primary switched-mode power supply and feed a DC intermediate circuit via which the at least one electric motor is connected.

[0013] Galvanic isolation of the mains connections is achieved using switched-mode power supplies. Decoupling in the power branch of the switched-mode power supply is accomplished in a power transformer, typically a transformer, which transmits the high-frequency pulsed input voltage. The internal control components of the switched-mode power supply must also be galvanically isolated from the output by means of potential isolation. For this purpose, an optocoupler is preferably provided in the switched-mode power supply. Alternatively, the switching signals to the switches of the switched-mode power supply can also be transmitted via auxiliary transformers to achieve potential isolation.

[0014] 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. Compared to the mains isolation transformers used in the prior art, switching power supplies are lighter and smaller overall due to the high frequencies.

[0015] The electric drive device can either be integrated into the truck-mounted concrete pump or designed as an external electric drive device.

[0016] Particularly when the electric drive device is designed as an external drive unit and an electric motor is used to drive a separate external hydraulic pump drive system to power the truck-mounted concrete pump, a conventional truck-mounted concrete pump, which is typically powered by the vehicle's internal combustion engine, can be very easily converted to electric operation on a construction site. Only very minor modifications to the truck-mounted concrete pump are necessary to enable electric operation. The hydraulic pump drive system, driven by an electric motor, can be designed to operate with 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 unit for the electric operation of the truck-mounted concrete pump.

[0017] A preferred embodiment of the invention provides that at least one of the mains connection modules comprises two or more primary-switched power supplies connected in parallel. Due to the high power requirements of the electric motor for drive operation, it is advantageous to connect several galvanically isolated switched-mode power supplies in parallel for each mains connection. This allows the use of lower-power switched-mode power supplies overall. Such switched-mode power supplies are used as mass-produced products, for example, in the field of electromobility, and are therefore cost-effective and standardized.

[0018] A particularly preferred embodiment of the invention provides for an electric accumulator connected to the intermediate circuit. The accumulator can then be charged when excess power is available or the electric motor is not in use. During full-load operation of the electric motor, the accumulator can provide temporary support 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 charged via the DC intermediate circuit.

[0019] In a suitable embodiment, the hydraulic pumps of the hydraulic pump drive system are driven by exactly one electric motor. The electric motor drives all the hydraulic pumps via a hydraulic pump train. This type of drive is also typically used when an internal combustion engine is employed. The pumps not in use then run idle.

[0020] An alternative, advantageous 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 DC link. This separate drive eliminates idle times and thus saves energy.

[0021] The invention comprises a truck-mounted concrete pump comprising a hydraulically driven concrete pumping system for conveying concrete, a hydraulic pump arrangement, and an internal combustion engine, wherein 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 pumping system, wherein the concrete pumping system of the truck-mounted concrete pump can be driven by the electric drive device according to the invention.

[0022] Preferably, the truck-mounted concrete pump hydraulic pump drive system of the truck-mounted concrete pump comprises a plurality of hydraulic pumps, and the concrete pumping system of the truck-mounted concrete pump comprises a plurality of hydraulic consumers, wherein the hydraulic pump drive system of the electric drive device comprises a plurality of hydraulic pumps, and the hydraulic consumers of the truck-mounted concrete pump are connectable to the plurality of hydraulic pumps of the electric drive device via a plurality of hydraulic supply lines. The hydraulic supply lines allow for easy connection of the hydraulic consumers of the truck-mounted concrete pump to the hydraulic pumps of the hydraulic pump drive system.

[0023] Advantageously, the truck-mounted concrete pump can include a hydraulic pump drive system with at least one hydraulic pump to drive the concrete pumping system and, additionally, the electric drive unit for 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 located on the truck-mounted concrete pump 100, and the truck-mounted concrete pump 100 can be put into operation on the construction site with the combustion engine switched off, without having to set up and connect an additional power unit.

[0024] For the electric drive of the truck-mounted concrete pump, wherein the truck-mounted concrete pump has a hydraulically driven concrete pumping system for conveying concrete and a truck-mounted concrete pump hydraulic pump drive system and an 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 the hydraulic drive of the concrete pumping system of the truck-mounted concrete pump and an electric motor for driving the hydraulic pump drive system, the hydraulic pump drive system of the electric drive device can be connected to the concrete pumping system of the truck-mounted concrete pump via hydraulic supply lines.

[0025] Advantageously, the truck-mounted concrete pump hydraulic pump drive system according to the invention has a plurality of hydraulic pumps, 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 concrete pumping system can be connected to the plurality of hydraulic pumps of the electric drive device via a plurality of hydraulic supply lines.

[0026] A more detailed description of the hydraulic design of the system can be found in the international patent application of the present applicant dated 4 July 2022, file number PCT / EP 2022 / 068446, which was not yet published at the time of the present application. Figure 1-4and the associated description (page 8, line 18 - page 21, line 28). This description is expressly referenced here and is therefore part of the present disclosure.

[0027] 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 designated with the same reference numerals in all figures.

[0028] Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. The drawings show: Figure 1: schematically a system in a first embodiment; Figure 2: schematically the detailed structure of a switched-mode power supply of an electric drive device according to the invention; Figure 3: schematically a block diagram of an electric drive device according to the invention in a further embodiment; Figure 4: schematically a block diagram of a system in a further embodiment; Figure 5: schematically a block diagram of a system in a further embodiment.

[0029] The Figure 1 shows a system comprising a truck-mounted concrete pump 100 according to the invention, connected to an electric drive device 200 according to the invention.

[0030] 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.

[0031] The concrete pumping system 110 is mounted on a truck chassis 130 with a cab. The concrete pumping system 110 comprises various hydraulic consumers 111, 112, 113, 114, 115, for example, an agitator 111 for mixing the fresh concrete in the filling hopper 116, a two-cylinder piston pump 114, for example, consisting of delivery cylinders driven by differential hydraulic cylinders, and a concrete switching valve 112. Instead of a two-cylinder piston pump 114, another pumping technology could also be used, for example, a rotary peristaltic pump. Further hydraulic consumers of the concrete pumping system 110 include, 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-mounted concrete pump) or, for example, be designed as a simple concrete pump mounted on a truck chassis without a boom or support.

[0032] 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 comprises 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.

[0033] The electric drive device 200 has two mains connection interfaces in the form of plugs 202, each of which, according to the invention, is associated with a mains connection module 203, designed as primary-switched power supplies 220. The electrical power supply device 200 can be connected to the mains supply, for example via a construction site power distribution box 300, via the plugs 202. A DC intermediate circuit 204 is supplied 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 power supply device 200 can, for example, additionally include a battery 207, which, depending on the capacity of the battery 207, can drive the electric motor 201 on its own for a certain period of time or provide additional current to supplement the construction site power supply in order to support the concrete pumping system 110 during peak loads.The battery 207 can be charged, for example, during pumping breaks or periods of low power demand of the concrete pumping system 110, via an electrical power distribution unit (not shown) connected to the construction site power distribution box 300. The capacity of the battery 207 could also be large enough to completely eliminate the need for the construction site power connection 300. Alternatively or additionally to the battery 207, a fuel cell could be used. The battery 207 could also be located outside the electric drive unit 200. The construction site power distribution box 300 could also be supplemented with a fuel cell or an electric battery, for example, to supply the entire construction site. In addition to or as an alternative to the battery 207, the electric drive unit 200 could have a supercapacitor to bridge short-term power peaks.

[0034] In the Figure 1The electric drive device 200 is shown separately for the electro-hydraulic drive of a conventionally combustion engine-powered truck-mounted concrete pump 100, which is spatially arranged next to the truck-mounted concrete pump 100, for example on a transport trailer or a transport vehicle. The hydraulic pump drive system 210, driven by the electric drive device 200 and comprising the hydraulic pumps 211a-d, is also arranged on this transport vehicle or trailer.

[0035] In this 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 delivers 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 pumping system 110 is delivered or pumped from the hydraulic pump drive system 210 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 normally be the case according to the state of the art, the hydraulic oil required by the hydraulic pump drive system 210 were drawn from the hydraulic oil tank of the truck-mounted concrete pump 100, the hydraulic return line 101e required for this 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 easily connected to the truck-mounted concrete pump 100.

[0036] 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.

[0037] In Figure 2Figure 1 shows a more detailed block diagram of a switched-mode power supply 220 for use in an electrical drive device 200 according to the invention. Controlled switched-mode power supplies provide constant output voltages or currents. The constancy of the output variable is achieved by controlling the energy flow into the switched-mode power supply 220 and thus to the connected electrical loads – a closed control loop exists.

[0038] A 3-phase mains voltage (AC) is present at the input of the switching power supply 220. However, it is also possible to use 1- or 2-phase switching power supplies. Mains-side interference is filtered out by a mains filter 221.

[0039] The mains AC voltage is then rectified and smoothed using a rectifier 222.

[0040] Furthermore, a switching transistor 223 is shown, which operates in the primary circuit of a subsequent transformer 224. The switching power supply 220 is therefore primary-switched. For example, a MOSFET, a bipolar transistor, or an IGBT can be used as the switching transistor 223. However, thyristors are typically used in high-power applications, such as the present one. The transformer 224 of the primary-switched power supply 220 operates 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, the transformer 224 can be correspondingly small and lightweight. The DC voltage is "chopped" into a switched voltage with a frequency corresponding to the operating frequency by means of the switching transistor 222. The power is transferred via the transformer 224, and galvanic isolation between the primary and secondary sides is achieved.On the secondary side of the transformer 224, a second rectifier 225 is arranged, which rectifies and smooths the high-frequency switching voltage.

[0041] The control circuit shown ensures that the amount of energy flowing into the switching power supply 220 matches the amount of energy that the switching power supply 220 is required to supply to the DC intermediate circuit 204. The necessary control can be achieved via pulse width or pulse phase control. For example, as shown, the control can be implemented using an operational amplifier 226. Galvanic isolation in the control circuit is provided by an optocoupler 227. The switching power supply 220 is then controlled and monitored by control electronics 228, for example, in the form of a microchip.

[0042] The switching power supply is therefore galvanically isolated from the mains supply both in the power section by the transformer 224 and in the control section by the optocoupler 227.

[0043] Figure 3Figure 1 shows a block diagram of a part of the electric drive device 200 in a second embodiment. In this embodiment, the mains connection modules 203 each have four switched-mode power supplies 220 connected in parallel. This allows the mains connection modules 203 to draw a maximum of the sum of the rated currents of the individual switched-mode power supplies 220. If the rated current of a switched-mode power supply 220 is, for example, 32 A, then 128 A can be transmitted with four switched-mode power supplies, which corresponds to a power of approximately 88 kW with a 400 V three-phase connection. The connection capacity of a 125 A CEE connection can thus be optimally utilized. A power of 176 kW could therefore be fed in via the two mains connection modules. The parallel connection of several switched-mode power supplies 220 means that each of them can be dimensioned smaller.

[0044] Figure 4Figure 1 shows a block diagram of the electrical drive device 200 according to the invention in a further embodiment. Here, several electric motors 201a-c 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 running times of the hydraulic pumps 211a-c, thereby saving energy overall. For example, during the setup and dismantling of the truck-mounted concrete pump 110, i.e., during the extension of the outrigger 113 and the unfolding of the concrete placing boom 115, only the electric motor 201b, which drives the hydraulic pump 211b for the outrigger 113 and the concrete placing boom 115, is in operation. The electric motor 201a, which drives the hydraulic pump 211a for the drive of the two-cylinder piston pump 114, can remain switched off during this time, thus saving electrical energy during assembly and disassembly.Furthermore, individual elements, which are usually 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 exemplary embodiment of the... Figure 1 The hydraulic pump 211d is driven by a hydraulic motor (not shown). To avoid hydraulic losses, in the exemplary embodiment of the Figure 4Therefore, the hydraulic pump 211d was omitted. Instead, an electric motor 201 could directly drive the agitator. Additional electric motors 201 for direct electric drives on the truck-mounted concrete pump 100 could be added, thus eliminating the need for further lossy hydraulic drives. Other combinations of electric motors 201 and hydraulic pumps 211 are conceivable. For example, only one electric motor 201 could be used to drive one or more hydraulic pumps 211, and additional electric motors 201 could be used for the direct electric drive, for example, of the joints of the concrete placing boom 15. The in Figure 4 The illustrated electric drive device 200 can, as shown in the Figure 1The electric drive device 200 is shown to be arranged separately from the truck-mounted concrete pump 100 and connectable to it for its drive, or it can be integrated on the truck-mounted concrete pump 100 for the drive of 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.

[0045] Figure 5Figure 1 shows a block diagram of the electric drive device 200 according to the invention in a further embodiment. In this case, the electric drive device 200 preferably forms an integral part of the truck-mounted concrete pump 100. The hydraulic pump drive system 210, or the hydraulic pumps 211a-d, can be driven by the electric motor 201 of the electric drive device 200 and / or by 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 distribution gearbox 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 during operation; however, it could also be an additional internal combustion engine 208 that is arranged on the truck-mounted concrete pump 100.The internal combustion engine 208 can be coupled to or disengaged 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 cardan shaft for the drive system or via a power take-off (PTO), such as an engine-dependent power take-off (APO).

[0046] Alternatively, the truck chassis 130 could be driven 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 could be provided on the truck chassis. These could 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 in connection with Figure 1As described, it is arranged separately from the truck-mounted concrete pump 100. It should also be assumed for the future that, in particular, the capacity of batteries alone will not be 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 extended pumping operation. Reference symbol list:

[0047] 100 Truck-mounted concrete pump 101a-e Hydraulic supply / return line 110 Concrete pumping system 111 Agitator 112 Concrete switching valve 113 Support 114 Twin-cylinder piston pump 115 Concrete placing boom 116 Hopper 130 Truck chassis 200 Electric drive device 201 Electric motor 202 Plug 203 Mains connection module 204 DC intermediate circuit 205 Inverter 206 Power cable 207 Battery 208 Internal combustion engine 210 Hydraulic pump drive system 211a-d Hydraulic pumps 212 Hydraulic oil tank 213 Distribution gearbox 220 Switching power supply 221 Mains filter 222 First rectifier 223 Switch 224 Transformer 225 Second rectifier 226 Operational amplifier 227Optocoupler 228Control unit 229Coupling 300Construction site power distributor

Claims

1. 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) can be driven by a hydraulic pump drive system (210) comprising at least one hydraulic pump (211a-d), wherein the concrete pumping system (110) of the truck-mounted concrete pump (100) can be driven by an electric drive device (200), having 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 the mains connection interfaces (202) are each assigned at least one mains connection module (203), wherein the mains connection modules (203) each have at least one primary switched-mode power supply unit (220) and feeding a DC intermediate circuit (204) via which the at least one electric motor (201) is connected.

2. Truck-mounted concrete pump (100) according to claim 1, characterized in that at least one of the mains connection modules (203) has two or more switched-mode power supply units (220) connected in parallel.

3. Truck-mounted concrete pump (100) 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. Truck-mounted concrete pump (100) according to any one of claims 1-3, characterized in that the at least one hydraulic pump (211a-d) of the hydraulic pump drive system (210) is driven by means of a single electric motor (201).

5. Truck-mounted concrete pump (100) according to any 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 each being connected via the DC intermediate circuit (204).

6. Truck-mounted concrete pump (100) according to any one of the preceding claims, characterized in that an internal combustion engine (208) is additionally provided, which can be connected via a transfer case (213) in addition to or as an alternative to the electric motor (201) for driving the hydraulic pump drive system (210).

7. Truck-mounted concrete pump (100) according to any one of the preceding claims, characterized in that the truck-mounted concrete pump (100) can be connected to the electric drive device (200) for driving the concrete pumping system (110).

8. Truck-mounted concrete pump (100) according to any one of claims 1 to 6, 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).

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