1. A mobile concrete pump has at least one travel-driving engine (11) and a hydraulic pumping device for delivering liquid concrete, wherein at least one electric motor (14) is provided and the hydraulic pumping device can be selectively driven by the at least one travel drive engine (11) or the at least one electric motor (14), characterized in that the driving engine (11) is connected to the branch gearbox (10) via a power take-off of a transmission gearbox (12) of a driving transmission system of the mobile concrete pump, wherein a first gearbox input of the branched gearbox (10) is coupled to a power take-off of the travel drive engine (11), and a second gearbox input is coupled with the electric motor (14) and a gearbox output of the branching gearbox (10) is connected to at least one hydraulic pump (4) of the hydraulic pumping arrangement.

2. Truck-mounted concrete pump according to claim 1, characterized in that the travel drive engine (11) is an internal combustion engine.

3. Truck mounted concrete pump according to any of the preceding claims, characterized in that the electric motor (14) and the at least one hydraulic pump (4) and/or the travel drive engine (11) are located on separate shafts, respectively, so that the power transmission between the electric motor (14) and the at least one hydraulic pump (4) can be interrupted.

4. The mobile concrete pump according to any one of the preceding claims, characterized in that the power take-off of the transmission gearbox (12) is an engine-dependent power take-off which is directly connected to the crankshaft of the travel drive engine (11).

5. Truck mounted concrete pump according to any one of the preceding claims, characterized in that the electric motor (14) and the at least one hydraulic pump (4) are located on the same side of the branching gearbox (10).

6. The truck mounted concrete pump according to one of claims 1 to 4, characterized in that the electric motor (14) and the at least one hydraulic pump (4) are located on opposite sides of the branch gearbox (10).

7. The mobile concrete pump according to any one of the preceding claims, characterized in that the electric motor (14) has an electric power output of at least 100kW, in particular an electric power output of 130 kW.

8. Truck mounted concrete pump according to any one of the preceding claims, characterized in that said at least one hydraulic pump (4) is mechanically coupled either exclusively with said electric motor (14) or exclusively with said travel drive engine (11).

9. The mobile concrete pump as claimed in one of the preceding claims, characterized in that the electric motor (14) can be supplied by a power supply connection of the mobile concrete pump, in particular only by the power supply connection.

10. The mobile concrete pump as claimed in claim 9, characterized in that the power supply connection comprises one or more connection points for one or more parallel power supply lines, wherein the connection points are designed for identical or different continuous load values.

Background

Truck mounted concrete pumps usually consist of a commercial truck chassis with an attachment unit placed on top, usually consisting of a concrete pump, a support device and a concrete distribution boom. All the drives of the attachment unit are normally hydraulically powered by hydraulic pumping means. The pumping device usually comprises one or more hydraulic pumps which feed at least one hydraulically driven pump cylinder in order to deliver fresh concrete to a predetermined location via a distribution boom. Further hydraulic pumps or other hydraulic consumers, for example for adjusting the distribution boom, can likewise be part of the pumping device.

Common truck-mounted concrete pumps typically operate using a diesel hydraulic drive, i.e., a diesel engine used as the chassis of a commercial truck of a vehicle in travel mode drives the hydraulic pumping equipment at the construction site during fixed pumping operations. Especially at urban construction sites, the resulting noise and exhaust emissions are undesirable.

Disclosure of Invention

The object of the invention is therefore to develop a concrete pump on board a vehicle without technically modifying the chassis of a commercial truck used as a carrier vehicle, so that no undesirable diesel exhaust gases are produced, in particular during fixed-pump operation.

This object is achieved by a truck mounted concrete pump according to the features of claim 1. Advantageous embodiments of the truck mounted concrete pump are subject of the dependent claims.

According to the invention, it is proposed to additionally equip the motor on the truck-mounted concrete pump. However, instead of an electric hydraulic drive of the hydraulic pumping device, an option is provided according to the invention to drive the hydraulic pumping device either by an electric motor or alternatively by a built-in travel drive engine. The travel drive engine may in particular be an internal combustion engine or a diesel engine. For the sake of simplicity, in the following it will mainly be assumed that the internal combustion engine is a travel driven engine, but for alternative embodiments of the travel driven engine the following statements apply as well. For example, it may be formed by an additional electric travel drive motor.

The structure of a truck-mounted concrete pump comprises a commercial truck chassis on which an attachment unit consisting of a hydraulic pumping device and preferably a concrete distribution boom is placed. Some or all of the drives of the attachment unit are hydraulically powered by one or more hydraulic pumps.

The driving drive engine of the mobile concrete pump corresponds to the driving drive of the commercial truck chassis and is driven by a torque-transmitting mechanical connection between the driving drive engine and one or more drive axles of the commercial truck chassis, preferably a cardan shaft. The hydraulic pumping arrangement will be understood to mean at least a part of a hydraulic system for pumping work. This includes, for example, at least one hydraulic pump for providing a hydraulic power source, and at least one hydraulically driven pumping unit for delivering liquid concrete, for example in the form of a pump cylinder. Additional hydraulic pumps may be provided for feeding any secondary consumers, such as hydraulic actuator devices for adjusting the distribution boom of a concrete pump.

First, in a fixed pumping operation, the truck mounted concrete pump, and in particular the hydraulic pumping unit, will be operated by an electric motor. Thus, undesirable exhaust emissions from diesel engines can be avoided. If required, that is to say if the electrical power required for the operation of the electric motor is missing, for example because of the lack of necessary power infrastructure at the construction site, it should be possible to switch instead to the internal combustion engine of the concrete pump on board the vehicle, in particular of the carrier vehicle. Thus, the hydraulic pumping device, in particular the at least one hydraulic pump, should be able to be driven either by an internal electric motor or alternatively by an internal travel drive engine/internal combustion engine of the truck-mounted concrete pump. When using a drive motor, the alternative drive variant may preferably remain inoperative, i.e. switched off.

The travel drive engine/internal combustion engine used is primarily used for the travel drive of the mobile concrete pump. In particular, it is an integral part of the carrier vehicle and is connected to the travel drive train when the vehicle is regularly travelling on a road. For example, the internal combustion engine is a diesel genset.

The supply of the hydraulic pumping arrangement by any of the travel drive engine/combustion engine and an additionally mounted electric motor is achieved by interposing a branched gearbox between the hydraulic system and the drive unit. This branch gearbox has two drive inputs and one output. The internal combustion engine and the electric motor are each coupled to an input, and the hydraulic pumping device, in particular at least one hydraulic pump, is coupled to the output of the branching gearbox.

As already discussed above, the internal combustion engine serves as a travel drive and is connected to the travel drive train of the mobile concrete pump via a transmission gearbox. The mechanical connection to the branch gearbox may be achieved by a power take-off of the transfer gearbox to alternatively drive the hydraulic pumping arrangement. The power take-off of the transmission gearbox is preferably an engine-dependent power take-off which is directly connected to the crankshaft of the internal combustion engine. It is important that in the solution according to the invention the branching gearbox for attaching the at least one hydraulic pump is not integrated in the travel transmission system, but rather is integrated with the power take-off of the electric motor or with the transmission gearbox on the side of the electric motor. Since the construction of the concrete pump generally uses an off-the-shelf commercial truck chassis with an existing running gear system, which is equipped with the required construction of the concrete pump, the running gear system of the carrier vehicle can be kept unchanged by attaching the branch gearbox to the power take-off of the running drive engine of the vehicle chassis.

According to a preferred embodiment, the electric motor and the at least one hydraulic pump are located on separate shafts, so that the power transmission between the electric motor and the at least one hydraulic pump can be interrupted. The internal combustion engine is also preferably located on a separate shaft. In this case, the branch gearbox may be embodied as a manual transmission gearbox and comprise, for example, two switching states in order to transfer torque from the first or second input to the output as required. Of course, an interconnection in which the torques of both inputs are transmitted to the output is also conceivable, i.e. the electric motor and the internal combustion engine jointly provide the necessary drive torque for the hydraulic pumping device. However, a preferred variant provides for power transmission exclusively from one input to the output, while the second input is mechanically disconnected.

Furthermore, the arrangement of the hydraulic pump and the electric motor on separate shafts has the advantage that: the electric motor can be flexibly placed, in particular with respect to the at least one hydraulic pump. Thus, for example, the electric motor may be arranged on the same side of the branching gearbox as the at least one hydraulic pump. However, there is no reason to not arrange the electric motor and the at least one hydraulic pump on opposite sides of the branching gearbox.

The motor used may have a power output of at least 80kW, preferably at least 100kW, and ideally about 130 kW. Due to the above-mentioned possibility of flexibly mounting the motor, there is less restriction on the size of the motor, which is why it is also possible in the present case to build in a larger motor with sufficient power output. The electric motor may be a synchronous motor, in particular a liquid-cooled synchronous motor. Embodiments are also conceivable in which the ring motor is mounted directly on the shaft to be driven, for example the gearbox input of the branching gearbox.

The truck mounted concrete pump may be provided with an external power connection to enable the motor to be powered from an external mains supply. Thus, the truck mounted concrete pump can be connected to a power source at a fixed construction site to be able to tap sufficient power output for pumping work. If there is no job site power, the pumping operation can be switched to the internal combustion engine.

The power supply wiring of the vehicle-mounted concrete pump can be realized through a plurality of connecting points, so that necessary energy can be provided through a plurality of power supply lines. For example, the maximum power of the pumping operation may be tapped by using all pluggable lines. Using fewer connection points also allows for connection to a weaker job site utility power supply with fewer connection cables, but only reduced power can be used for the pumping operation. The connection points of the truck-mounted concrete pump can preferably be designed for different or alternatively identical continuous loads. The connection point may be embodied as a CEE socket, in particular a 5-pole CEE socket. It is contemplated, for example, that a first CEE outlet has a maximum continuous load of 63A at 400V, while a second CEE outlet is designed for a higher maximum continuous load, such as a continuous load of 125A at 400V. In exactly the same way, the connection point can also be adapted to regulations in other national/regional standards, for example in the form of "IEC connectors" used in the United states, which comply with the respective instructions IEC60309-1 and IEC 60309-2. Different connection points designed for different continuous loads are also conceivable here, for example 30A, 60A and 100A at voltages between 500V AC and 600V AC.

Drawings

Further advantages and characteristics of the invention will be discussed below with reference to examples of embodiments shown in the drawings, in which:

FIG. 1 is a schematic side view of a truck-mounted concrete pump according to the invention, an

Fig. 2 is a detail view of the transmission system for the feed hydraulic pump arrangement.

Detailed Description

Fig. 1 shows schematically a side view of a truck-mounted concrete pump according to the invention, consisting of a commercial truck chassis 1 with a travel drive engine 11 for the travel mode and an upper structure 2 with a hydraulic pumping device mounted thereon. Said superstructure basically comprises a distribution boom 3 and said hydraulic pumping arrangement with a plurality of hydraulic pumps 4. The hydraulic pump 4 ensures in particular that the necessary hydraulic pressure is used for operating the pump cylinder 5 and for operating any secondary consumers or actuators that regulate the distribution bar 3.

As can be gathered in particular from the detailed illustration in fig. 2, the hydraulic pump 4 is coupled jointly to the output B of the manual transmission gearbox 10. The manual transmission gearbox 10 comprises two input ends a, C in addition to an output end B. Depending on the switching state of the manual transmission gearbox 10, optionally in combination with the necessary gear ratios, either of the mechanical power applied to input a and the mechanical power applied to input C can be switched to output B.

The first input a is connected to the power take-off of a transmission gearbox 12 of the running gear of the truck chassis 1 via a shaft connection 13. The flange is arranged on the input end of the transmission gearbox 12 and is provided with a diesel generator set 11; the main output of the transmission gearbox 12 is coupled to a further drive train in order to drive the truck chassis 1 or the truck-mounted concrete pump on the road. The diesel-electric set 11 of the truck chassis 1 is thus mainly used for realizing the driving mode of the onboard pump, but at least part of the mechanical power of the diesel-electric set 11 can also be used to drive the hydraulic pumping device with the pump 4 via the power take-off of the transmission gearbox 12.

The electric motor 14 is coupled to the manual transmission gearbox 10 via an input C. The principle of the truck-mounted concrete pump according to the invention is that the fixed pumping work is carried out electrically, mainly by means of the electric motor 14, and therefore in a discharge-free manner. The travel drives of these truck-mounted concrete pumps have hitherto been powered by diesel engines.

The necessary electrical power for the electric motor 14 is tapped from the construction site mains supply via a power supply connection. After the construction site which can use the vehicle-mounted concrete pump is confirmed to be changed frequently, the construction site is connected with a commercial power supply of the construction site through one or more pluggable wiring or power supply lines. The use of multiple pluggable lines to achieve maximum power makes it possible to accommodate weaker job site mains power by using fewer connecting cables, but this can result in performance loss.

Since the current construction site mains supply is not designed regionally for high electrical power consumption, a clever development of the mobile concrete pump is to implement the travel drive in principle by means of the diesel engine 11, but to make it possible to drive the hydraulic pump system 4 either by means of the diesel engine 11 or by means of the additionally installed electric motor 14.

By means of the invention, a hybrid drive of the attachment unit 2 of the mobile concrete pump is achieved, which makes possible an all-electric or diesel-electric drive of the pump hydraulic system. Furthermore, the construction according to the invention allows the use of a commercial truck chassis 1 on which an attachment unit 2 consisting of the distribution rod 3, the pumping device with pump 4 and the pump cylinder 5 is placed. The extension of the attachment unit by the manual transmission gearbox 10 and the electric motor allows the attachment unit to be electrically driven in stationary non-mobile operation by coupling to a common mains supply.

By attaching the manual transmission gearbox 10 to the power take-off of the truck drive train, there is no need to intervene in the drive of the commercial truck chassis 1.

The driving drive of the mobile concrete pump corresponds to the driving drive of the commercial truck chassis 1 and is driven by a torque-transmitting mechanical connection between the driving drive engine 11 and one or more drive axles of the commercial truck chassis 1, preferably by means of a cardan shaft.