EP4673652A1 - Zweizylinder-dickstoffpumpe - Google Patents
Zweizylinder-dickstoffpumpeInfo
- Publication number
- EP4673652A1 EP4673652A1 EP24708361.1A EP24708361A EP4673652A1 EP 4673652 A1 EP4673652 A1 EP 4673652A1 EP 24708361 A EP24708361 A EP 24708361A EP 4673652 A1 EP4673652 A1 EP 4673652A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydraulic
- pump
- thick matter
- delivery
- hydraulic pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G21/0418—Devices for both conveying and distributing with distribution hose
- E04G21/0436—Devices for both conveying and distributing with distribution hose on a mobile support, e.g. truck
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G21/0418—Devices for both conveying and distributing with distribution hose
- E04G21/0445—Devices for both conveying and distributing with distribution hose with booms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
- F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
- F04B7/0233—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
- F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
- F04B7/0233—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers
- F04B7/0241—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an oscillating movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
- F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
- F04B7/0233—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers
- F04B7/025—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having a slidable movement
Definitions
- the invention relates to a two-cylinder thick matter pump, in particular for a truck-mounted concrete pump, with at least one first hydraulic pump, two hydraulic drive cylinders driven in push-pull by the at least one first hydraulic pump, which are provided for driving two delivery pistons, each of which runs in one of two delivery cylinders of the two-cylinder thick matter pump, wherein a thick matter delivery rate can be adjusted by adjusting the delivery capacity of the at least one first hydraulic pump, with a second hydraulic pump and with a switchover hydraulic accumulator, wherein the second hydraulic pump is provided to charge the switchover hydraulic accumulator, at least one switchover hydraulic cylinder fed from the switchover hydraulic accumulator and with a thick matter switchover valve driven by the at least one switchover hydraulic cylinder, which is provided for alternately connecting the two delivery cylinders to a thick matter delivery line.
- a hydraulic pump train consisting of several hydraulic pumps arranged in series, which drives the units of the concrete pump structure, for example a concrete pump designed as a two-cylinder thick matter pump, the distribution boom, the support and other units required for operation, is usually driven on the construction site by a diesel engine on the truck chassis.
- a diesel engine on the truck chassis.
- truck-mounted concrete pumps electrically on the construction site.
- a truck-mounted concrete pump has several hydraulic pumps arranged in series, a so-called hydraulic pump train, driven by the power take-off of the diesel engine.
- the speed of the diesel engine should be kept as low as possible, but is ultimately based on the power requirements of the truck-mounted concrete pump structure, in particular the concrete pump, because this has the highest power requirements when conveying concrete.
- the simultaneous drive of all hydraulic pumps inevitably means that all hydraulic pumps, which drive the concrete pump, the distribution boom, the support, the agitator, the concrete changeover valve and possibly other units of the structure, are driven at an identical, usually constant speed. This alone results in power losses because the available power of the hydraulic pumps is not constantly used, even if some hydraulic pumps can be switched to idle mode by adjusting the delivery rate.
- One of the hydraulic pumps in the hydraulic pump train the so-called accumulator charging pump, charges a hydraulic accumulator for switching the switching valve of the two-cylinder thick matter pump.
- the switching valve must be switched in the shortest possible time (approx. 250-500 ms) using one or two hydraulic cylinders. This short switching time is necessary because the delivery cylinders of the two-cylinder thick matter pump are short-circuited with one another during the switching of the switching valve. which results in a drop in the delivery pressure and should therefore be kept as low as possible.
- the accumulator charging pump is dimensioned in such a way that, assuming a diesel engine speed of, for example, 1200 rpm, it fills the hydraulic accumulator so quickly between switchover processes that even at the highest delivery rate of the two-cylinder thick matter pump, the hydraulic accumulator fills sufficiently quickly for the switchover process.
- the switchover valve switches over every two to two and a half seconds, for example, so that the hydraulic accumulator must be refilled in around two seconds.
- the accumulator charging pump has a simple control system, i.e.
- the pump when the pressure in the hydraulic accumulator has reached a predetermined value, the pump is switched to idle by reducing the delivery rate, or the hydraulic oil delivered by the accumulator charging pump is directed past the hydraulic accumulator and into the hydraulic oil tank.
- the energy consumption of the accumulator charging pump is also very high. If a lower delivery capacity is required, for example, where the changeover valve is only switched every five seconds, the storage charging pump is driven for about three seconds between the switching processes without further charging the storage and requires a corresponding drive power even when idling.
- This object is achieved by a two-cylinder thick matter pump with the features of claim 1 and a method for operating a two-cylinder thick matter pump according to claim 13. Because the delivery capacity of the second hydraulic pump, which charges the hydraulic changeover accumulator, can be adjusted depending on the set thick matter delivery rate, the drive power of the second hydraulic pump can be reduced if a lower thick matter delivery rate is required.
- the two-cylinder Thick matter pump is driven by an electric motor whose drive power is lower than the drive power of an internal combustion engine, which regularly leads to a rather low set thick matter delivery rate. Power consumption peaks of the second hydraulic pump are also avoided, so that the available drive power can be better used for the actual thick matter delivery, that is, for driving the delivery cylinders.
- Advantageous embodiments and further developments of the invention arise from the dependent claims. It should be noted that the features listed individually in the claims can also be combined with one another in any technologically sensible way and thus show further embodiments of the invention. It is preferably provided that the delivery rate of the second hydraulic pump can be adjusted so that the switchover hydraulic accumulator is completely filled immediately before a switching process of the thick matter switchover valve.
- a control device is set up to adjust the delivery rate of the at least one first hydraulic pump and the delivery rate of the second hydraulic pump in accordance with the set thick matter delivery rate.
- the control device can optimally adjust the delivery rates of the at least one first and the second hydraulic pump depending on the set thick matter delivery rate and, if necessary, also take into account the available drive power for the hydraulic pumps, so that no short-term power consumption peaks occur that are above the available drive power.
- the delivery rate of the second hydraulic pump can be adjusted by adjusting the geometric delivery volume of the second hydraulic pump.
- the second hydraulic pump is designed, for example, as an axial piston variable displacement pump, the geometric delivery volume of which can be easily adjusted by adjusting the swivel angle of the swash plate, and thus the delivery capacity of the second hydraulic pump can be very well adapted to the required thick matter delivery quantity.
- the delivery capacity of the second hydraulic pump can be adjusted by setting the drive speed of the second hydraulic pump. This variant is particularly advantageous if the second hydraulic pump is designed as a so-called constant flow pump, e.g. as an inexpensive gear pump or as a simply constructed axial piston pump without the possibility of adjusting the delivery volume.
- a common drive motor drives the at least one first hydraulic pump and the second hydraulic pump, and the delivery capacity of the at least one first hydraulic pump and the delivery capacity of the second hydraulic pump can be adjusted by adjusting the speed of the drive motor.
- the drive motor is an electric motor whose speed can be easily adjusted to the required slurry flow rate without having to maintain a particularly efficient speed range as with a combustion engine
- the delivery capacity of the second hydraulic pump can be very easily adjusted to the required slurry flow rate, whereby the joint drive of both hydraulic pumps always automatically ensures the correct ratio of the delivery capacities of both hydraulic pumps.
- the first and second hydraulic pumps can also be advantageously driven by separate drive motors. This makes it possible to easily adjust the delivery capacity of the second and first hydraulic pumps to the respective delivery capacity of the two-cylinder slurry pump.
- the second hydraulic pump with the drive motor driving the second hydraulic pump is arranged spatially close to the thick matter switching valve, and the at least one first hydraulic pump and the second hydraulic pump are each assigned their own hydraulic oil tank. The spatially close arrangement of the second hydraulic pump with the drive motor on the thick matter switching valve in conjunction with separate hydraulic tanks reduces hydraulic power losses and in particular the length of the hydraulic suction hoses to a centrally arranged hydraulic tank, which are difficult to accommodate and complex to install, can be kept to a minimum.
- the drive motor driving the second hydraulic pump drives another hydraulic pump, which is intended to feed a hydraulic oil cooling and/or filter circuit.
- This additional hydraulic pump for feeding the hydraulic oil cooling and/or filter circuit can ensure a constant hydraulic oil flow through the hydraulic oil cooling and/or filter circuit, which is advantageous, especially because a hydraulic oil filter in particular reacts sensitively to a pulsating oil flow, as naturally occurs in the drive circuit of the hydraulic switching accumulator.
- the geometric delivery volume of the second hydraulic pump can be changed and it has a leakage oil connection via which leakage oil can be fed to the hydraulic oil cooling and/or filter circuit.
- this measure makes it very easy to use the usually particularly hot leakage oil to cool the entire tank volume.
- an agitator in a feed hopper mixes the thick material filled into the feed hopper, whereby the speed of the agitator can be adjusted depending on the set thick material delivery rate.
- the present invention relates to a method for operating a two-cylinder thick matter pump, wherein the two-cylinder thick matter pump has at least one switching hydraulic cylinder fed from a switching hydraulic accumulator for driving a thick matter switching valve, which is used for alternating connection of two delivery cylinders of the two-cylinder thick matter pump with a thick matter delivery line is provided.
- a charging speed with which the switching hydraulic accumulator is charged with hydraulic oil between the switching processes of the thick matter switching valve can be adjusted depending on a predetermined thick matter delivery rate.
- Figure 1 View of a two-cylinder piston pump according to the invention
- Figure 2 Drive diagram of a truck-mounted concrete pump according to the prior art
- Figure 3 Drive diagram according to the invention in a first embodiment
- Figure 4 Drive diagram according to the invention in a second embodiment
- Figure 5 Drive diagram according to the invention in a third embodiment
- Figure 6 Drive diagram according to the invention in a fourth embodiment
- Figure 7 Drive diagram according to the invention in a fifth embodiment
- Figure 8 Detailed view of a hydraulic drive unit according to the invention in a first variant
- Figure 9 Detailed view of a hydraulic drive unit according to the invention in a second variant
- Figure 10 Detailed view of a hydraulic drive unit according to the invention in a third variant Figure 1 shows a truck-mounted concrete pump 100 with a two-cylinder thick matter pump 111 according to the invention.
- the truck-mounted concrete pump 100 has a truck 102 driven by an internal combustion engine 103 with a chassis 104, on the frame 105 of which a concrete pump structure 101 is arranged.
- the concrete pump structure 101 essentially has a concrete pump substructure 127 with a support 108 with hydraulically driven support cylinders 109 and foldable or extendable support beams 121 as well as a hydraulically driven two-cylinder thick matter pump 111 for conveying or pumping concrete.
- the concrete pump substructure 127 has at its rear end a feed hopper 116 for liquid fresh concrete, in which an agitator 113 driven by a hydraulic motor stirs the fresh concrete, for example filled from a truck mixer.
- the concrete pump substructure 127 is connected to a distribution boom 107 via a turntable 106, the individual boom segments 126 of which are connected to one another via articulated joints 125.
- the Distribution boom 107, or each of the articulated joints 125, is actuated by means of hydraulic cylinders 110 or other suitable joint drives 110.
- the hydraulic pressure for driving the hydraulic cylinders 110 of the distribution boom 107 and the support 108 is provided by the hydraulic pump 119.
- Figure 2 shows a drive diagram of a hybrid, ie diesel/electrically driven truck-mounted concrete pump 100 with a two-cylinder thick matter pump 111 according to the prior art.
- a combustion drive motor 103 drives the chassis 104 for driving operation via a transmission 134.
- the support 108, the distribution boom 107, the agitator 113 and the two-cylinder thick matter pump 111 are hydraulically driven by the hydraulic pumps 115, 119, 117, 118 combined to form a hydraulic pump train 128, with an electric motor 122 driving the hydraulic pump train 128.
- the electric motor 122 draws its electrical energy from an electrical supply device 166.
- the electrical supply device 166 can, for example, draw electrical energy for driving the electric motor 122 from a construction site power supply 133, an external accumulator 120 on a transporter 136 or a trailer, from an on-board accumulator 120 or from a generator 132.
- FIG. 1 shows a drive diagram of a two-cylinder thick matter pump 111 according to the invention in a first embodiment.
- the structure of the two-cylinder thick matter pump 111 with regard to the arrangement of the hydraulic drive cylinders 147, the delivery pistons 149, the delivery cylinders 148 and the thick matter switching valve 112 corresponds to the structure as shown in Figure 2.
- the two-cylinder thick matter pump 111 has at least one, in this case two first hydraulic pumps 115, two hydraulic drive cylinders 147 driven in push-pull by the two first hydraulic pumps 115, which are provided for driving two delivery pistons 149, each of which runs in one of two delivery cylinders 148 of the two-cylinder thick matter pump, wherein the thick matter delivery quantity can be adjusted by adjusting the delivery capacity of the two first hydraulic pumps 115.
- the two-cylinder thick matter pump 111 also has a second hydraulic pump 117 and a switchover hydraulic accumulator 146, wherein the second hydraulic pump 117 is provided for charging the switchover hydraulic accumulator 146. Furthermore, the two-cylinder thick matter pump 111 has a switching hydraulic cylinder 145 fed from the switching hydraulic accumulator 146 and a thick matter switching valve 112 driven by the at least one switching hydraulic cylinder 145, which is provided for alternately connecting the two delivery cylinders 148 to a thick matter delivery line 164. The delivery capacity of the second hydraulic pump 117 can be adjusted depending on the set thick matter delivery rate.
- the charging speed with which the switching hydraulic accumulator 146 is charged with hydraulic oil between the switching processes of the thick matter switching valve 112 is adjusted depending on a predetermined thick matter delivery rate.
- the thick material delivery rate or the number of strokes of the hydraulic drive cylinders 147, which ultimately determines the thick material delivery rate, is specified by an operator, for example, on an input unit 143, for example in the form of a remote control 143, and passed on to the control device 142.
- the control device 142 sets the swivel angle of the first hydraulic pumps 115, which are designed, for example, as axial piston pumps with swivel disks, via an output unit and the control line 141, so that the desired thick matter delivery rate or stroke rate of the two-cylinder thick matter pump 100 is achieved.
- the delivery rate of the second hydraulic pump 117 which loads the switchover hydraulic cylinder 146, is also adjusted depending on the set thick matter delivery rate, in that the delivery rate of the second hydraulic pump 117 is also adjusted accordingly, for example by adjusting the geometric delivery volume, for example by adjusting the swivel angle of the hydraulic pump 117, if it is designed as an axial piston pump 117 with a swivel disk.
- the control device 142 and the second hydraulic pump 117 are connected to one another via the control line 135 for this purpose. This means that the control device 142 is set up to adjust the delivery rate of the at least one first hydraulic pump 115 and the delivery rate of the second hydraulic pump 117 in accordance with the set thick matter delivery rate.
- the hydraulic pumps 115, 119, 117, 118 are combined to form a hydraulic pump train 128 and are jointly driven by an electric motor M1.
- the hydraulic pump train 128 could also be driven by an internal combustion engine 103, for example the drive of the truck 102.
- the second hydraulic pump 117 feeds hydraulic oil via a check valve 151 into the switchover hydraulic accumulator 146, thereby charging it.
- the directional control valve 150 which controls the switchover hydraulic cylinder 145, is switched, whereby the thick matter switchover valve 112 in its housing 144 is switched abruptly and connects the other delivery cylinder 148 to the thick matter delivery line 164 for the delivery of thick matter.
- the other feed cylinder 148 is opened to the inside of the housing 144 so that it can suck in thick material or concrete from the housing 144.
- the feed pistons 149 then move in the opposite direction in the feed cylinders 148, while the switchover hydraulic accumulator 146 is charged in such a way that it is always immediately before the next switchover of the Thick matter changeover valve 112 is completely filled, that is, the changeover hydraulic accumulator 146 is filled to such an extent that the filling volume and the filling pressure are sufficient to switch the changeover hydraulic cylinder(s) 145 and thus the thick matter changeover valve 112.
- the second hydraulic pump 117 which continues to run, provides hydraulic pressure, in addition to the hydraulic pressure of the changeover hydraulic accumulator 145, for switching the thick matter changeover valve 112.
- a pressure relief valve 152 ensures that any excess pressure in the changeover hydraulic accumulator 146 is discharged into the hydraulic oil tank 153. This could occur, for example, if the thick matter changeover valve 112 is stuck.
- all hydraulic pumps 115, 117, 118, 119 suck in the hydraulic oil from the common hydraulic oil tank 153.
- the hydraulic pump line 128 of a truck-mounted concrete pump 100 is divided into two sub-lines 128a and 128b, each of which is driven separately by electric motors M1 and M2.
- the electric motor M2 which is connected to the direct current intermediate circuit 130, which has a constant direct current voltage of 600 volts, for example, via the inverter 160a, drives the distribution boom 107 or the support 108 via the hydraulic pump 119 and the agitator 113 via the hydraulic pump 118.
- the electric motor M2 is operated permanently at a constant speed for this purpose, for example, as long as the hydraulic consumers 107, 108, 113 are in operation.
- the speed of the electric motor M2 could also be controlled via the inverter 160a.
- An optional accumulator 120 and an inverter 158 are also connected to the DC intermediate circuit 130.
- a fuel cell for generating electrical energy a supercapacitor or similar electrical devices could also be provided.
- the inverter 158 is, for example, an on-board charger (OBC) that draws the alternating current from the construction site power supply 133 via one or a plurality of mains connectors 159 and converts it into direct current for the DC intermediate circuit 130.
- OBC on-board charger
- the accumulator 120 can be charged via the DC intermediate circuit 130 on the one hand, and on the other hand, direct current can be made available for driving the electric motors M1 and M2 in order to use them for a limited time.
- the accumulator 120 can also absorb power peaks that could overload the construction site power supply 133 if a construction site power supply 133 is present and connected.
- the two first hydraulic pumps 115 for driving the hydraulic drive cylinders 147 of the two-cylinder thick matter pump 111 and the second hydraulic pump 117 for charging the switchover hydraulic accumulator 146 together form the hydraulic pump train 128a and are driven by the common drive motor M1, in this case an electric motor M1, wherein the delivery capacity of the two first hydraulic pumps 115 for the hydraulic drive cylinders 147 and the delivery capacity of the second hydraulic pump 117 for charging the switchover hydraulic accumulator 146 can be adjusted by setting the speed of the drive motor M1.
- the speed of the electric motor M1 is regulated, for example, via an inverter 160b.
- the inverter 160b draws the power for the drive motor M1 from the DC intermediate circuit 130.
- the inverter 160b is also connected to the control device 142 via the control line 135, which sets the speed of the drive motor M1 via the inverter 160b on the basis of the thick matter delivery rate set on the input unit 143.
- the delivery capacity of the second hydraulic pump 117 is therefore also adjusted in the embodiment of Figure 4 depending on the set thick matter delivery rate, wherein the delivery capacity of the at least one first hydraulic pump 115 and the delivery capacity of the second hydraulic pump 117 can be adjusted by adjusting the speed of the drive motor M1.
- the embodiment according to Figure 5 shows a drive diagram in a third embodiment with a hybrid-driven truck-mounted concrete pump 100, i.e.
- the concrete pump structure 101 of the truck-mounted concrete pump 100 can be driven either by several electric motors M1/G, M2, M3 or by the combustion engine 103 of the truck 102 or mixed.
- the electric motor M1/G which in this embodiment drives, for example, the first two hydraulic pumps 115 for driving the hydraulic drive cylinders 147 and the hydraulic pump 119 for driving the distribution boom 107 and the support 108, in this embodiment also has the Function of a power generator.
- the shaft of the motor/generator M1/G can be mechanically coupled to the power take-off 123 or the power take-off gear 124 of the combustion engine 103 via the decoupling device 165, for example a switchable clutch or a freewheel, so that on the one hand the hydraulic pumps 115 and 119 are driven via the power take-off 123 of the combustion engine 103, and on the other hand the electric motor M1/G generates electrical current which is fed to the direct current intermediate circuit 130 via the inverter 160a, for example to charge the accumulator 120 and/or to drive the electric motors M2 and M3 via their inverters 160b and 160c.
- the decoupling device 165 for example a switchable clutch or a freewheel
- the concrete pump structure 101 can be driven with the help of the combustion drive motor 103 even if the capacity of the accumulator 120 is insufficient and/or there is no construction site power supply 133.
- the electric motor M3 drives the agitator 113 directly. This has the advantage that hydraulic losses through a hydraulic circuit with hydraulic pump and hydraulic motor are avoided. Furthermore, the independent operation of the agitator 113 via the electric motor M3 allows the speed of the agitator 113 to be adapted to the delivery rate of the two-cylinder piston pump 111, whereby the drive energy for the agitator 113 is also reduced when the delivery rate is reduced.
- a separate hydraulic drive unit 161 is provided in the embodiment according to Figure 5, which comprises, for example, the electric motor M2, the second hydraulic pump 117, a hydraulic oil cooling and/or filter circuit 137 with a hydraulic oil filter 155 and a hydraulic oil cooler 156 and a hydraulic oil tank 154.
- These elements thus form a separate, self-contained hydraulic drive unit 161, which can be positioned at a suitable location, i.e., for example, as close as possible to the hydraulic consumer, in this case the thick matter switching valve 112 with the switching hydraulic cylinder 145.
- the electric motor M2 of the hydraulic drive unit 161 drives, in addition to the second hydraulic pump 117, which charges the switchover hydraulic accumulator 146, a hydraulic pump 157 which continuously delivers hydraulic oil from the hydraulic oil tank 154 to the hydraulic oil filter 155 and hydraulic oil cooler 156 in order to filter and cool the hydraulic oil of the hydraulic drive unit 161.
- the second hydraulic pump 117 and the hydraulic pump 157 can be combined as a tandem pump, for example.
- the delivery rate of the second hydraulic pump 117 is adjusted by adjusting the geometric delivery volume of the second hydraulic pump 117, as already described in connection with Figure 3, via the control line 135.
- the hydraulic oil flow rate to the hydraulic drive cylinders 147 is recorded at the output of the first hydraulic pump 115 and signaled via the flow measurement signal line 131 to the control device 142, which based on this sets the optimal delivery rate for the second hydraulic pump 117, so that the switchover hydraulic accumulator 146 is completely filled immediately before a switching process of the thick matter switchover valve 112.
- the essential hydraulic pumps are designed as variable displacement pumps, the electric motors M1/G; M2 and M3 run at constant speeds.
- the speeds of the motors M1/G; M2 and M3 could also be adapted to the respective delivery rate/power requirements of the concrete pump structure 101 or the two-cylinder thick matter pump 111.
- the fourth embodiment shown in Figure 6 differs from the embodiment according to Figure 5 in particular in that the delivery rate of the second hydraulic pump 117 is adjusted via the speed of the electric motor M2.
- a control line 135 leads from the control device 142 to the inverter 160b for setting the speed of the electric motor M2.
- This has the advantage, for example, that when the delivery rate is reduced, the hydraulic pump 157 also drives the hydraulic oil cooling and/or filter circuit 137 with less power, thereby reducing hydraulic losses.
- the fifth embodiment of Figure 7 shows a drive diagram of a truck-mounted concrete pump 100 with a two-cylinder thick matter pump 111 according to the invention, in which both the truck chassis and the concrete pump structure 101 are driven fully electrically.
- an electric drive motor MF is also provided for the drive of the truck-mounted concrete pump 100.
- the electric motor M1 drives the two first hydraulic pumps 115 for driving the hydraulic drive cylinders 147 and the hydraulic pump 119 for driving the distribution boom 107 and the support 108.
- the second hydraulic pump 117 driven by the electric motor M2 charges the switchover hydraulic accumulator 146, the delivery capacity of the second hydraulic pump 117 being adjusted depending on the set thick matter delivery rate by setting the drive speed, for example by the inverter 160b controlled by the control device 142.
- the accumulator 120 supplies both the traction drive motor MF and the electric motors M1, M2, M3 with electrical energy, whereby when concrete is being pumped on the construction site, the mains connection plug(s) 159 are primarily intended to supply the electric motors M1, M2, M3 with electrical power.
- the accumulator 120 serves, for example, to provide additional electrical power to the construction site power supply 133 during power consumption peaks of the concrete pump structure 101, for example when the two-cylinder thick matter pump 111 is pumping a high volume of thick matter.
- the construction site power supply 133 can be used to charge the accumulator 120 when the electrical power consumption of the concrete pump structure 101 is low, for example during pumping breaks.
- the accumulator 120 can also be a traction drive battery assigned to the truck chassis 104.
- the concrete pump structure 101 can also have a separate battery 120 or be supplied entirely with electrical power from one or more construction site power supplies 133 via the external power connector(s) 159 if a drive battery of the truck chassis 104 cannot be used for the electrical operation of the concrete pump structure 101.
- the inverters 158, 160a, 160b, 160c are shown as separate modules that are connected to one another via the DC intermediate circuit 130. In principle, the inverters 158, 160a, 160b, 160c can also be combined to form an electrical supply device 166, i.e. practically as shown in Figure 2.
- FIG. 8 shows a variant of the hydraulic drive unit 161 in which the geometric delivery volume of the second hydraulic pump 117 can be changed and it has a leakage oil connection via which leakage oil can be fed to the hydraulic oil cooling and/or filter circuit 137.
- hydraulic pumps with a variable geometric delivery volume e.g.
- FIG. 9 shows a further alternative embodiment of a hydraulic drive unit 161, with which the thick matter changeover valve 112 and the agitator 113 are driven.
- the hydraulic drive unit 161 has two hydraulic pumps 117 and 118, which are provided for the pressure oil supply to the two working devices 112, 113 in hydraulic working circuits and which suck hydraulic oil from a hydraulic oil tank 154.
- the hydraulic pump 117 drives, for example, the thick matter switching valve 112 and the hydraulic pump 118 drives the agitator 113.
- Both the thick matter switching valve 112 and the agitator 113 are arranged in or on the feed hopper 116 of the concrete pump 100, so that the hydraulic drive unit 161 is arranged spatially close to the working devices 112, 113.
- the hydraulic working circuit of the agitator drive in which a hydraulic motor drives the agitator shaft, is also used here to cool the hydraulic oil of the hydraulic drive unit 161.
- the hydraulic oil is fed from the hydraulic pump 118 to the agitator 113 or to the hydraulic motor for driving the agitator 113.
- the return line from the agitator 113 leads through the hydraulic oil filter 155 and the hydraulic oil cooler 156 back to the hydraulic oil tank 154.
- the hydraulic pump 118 is thus simultaneously to a cooling circuit pump and the return line simultaneously fulfills the function of the hydraulic oil cooling and/or filter circuit 137.
- the hydraulic oil cooled by the hydraulic oil cooler 156 is used for liquid cooling of the electric motor M2 by the hydraulic oil being fed via a line to the electric motor M2, then flowing through the motor housing of the electric motor M2 and cooling it down in the process, and then being fed via another line to the hydraulic oil tank 154.
- the hydraulic pumps 117 and 118 could be combined to form one hydraulic pump that drives both the thick matter changeover valve 112 and the agitator 111 simultaneously.
- this requires a suitable hydraulic circuit to adjust the hydraulic oil pressures for the two working units 112 and 113.
- This variant is particularly advantageous in that the common drive motor M2 of the agitator 113 and the switchover hydraulic accumulator 146 adapts the charging process of the switchover hydraulic accumulator 146 to the delivery capacity of the second hydraulic pump 117 as a function of the set thick matter delivery rate via the speed of the drive motor M2, and the speed of the agitator 113 is also adapted to the delivery capacity.
- FIG. 10 shows a variant of the hydraulic drive unit 161 in which the second hydraulic pump 117, whose delivery capacity in this case is regulated by the drive speed of the electric motor M2, is switched to pressureless circulation when the necessary accumulator filling pressure for switching the thick matter switching valve 112 is reached, by the directional valve 138 releasing the hydraulic oil cooling and/or filter circuit 137.
- the remaining time until the switching hydraulic accumulator 146 is emptied can thus be used to cool and filter the hydraulic oil of the hydraulic drive unit.
- the directional valve 138 is closed again and the switching hydraulic accumulator 146 is refilled.
- the embodiments shown here relate to the hydraulic drive of the hydraulic drive cylinder 147 of the two-cylinder thick matter pump in a so-called open hydraulic circuit.
- the invention can also be easily transferred to the hydraulic drive of the hydraulic drive cylinder 147 in a closed hydraulic circuit with so-called reversing pumps, in which the hydraulic switching of the thick matter switching valve 112 is possible in the same way as presented here.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023104762.0A DE102023104762B4 (de) | 2023-02-27 | 2023-02-27 | Zweizylinder-Dickstoffpumpe und Verfahren zum Betrieb einer Zweizylinder-Dickstoffpumpe |
| PCT/EP2024/053870 WO2024179848A1 (de) | 2023-02-27 | 2024-02-15 | Zweizylinder-dickstoffpumpe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4673652A1 true EP4673652A1 (de) | 2026-01-07 |
| EP4673652B1 EP4673652B1 (de) | 2026-04-29 |
Family
ID=90105428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24708361.1A Active EP4673652B1 (de) | 2023-02-27 | 2024-02-15 | Zweizylinder-dickstoffpumpe |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4673652B1 (de) |
| DE (1) | DE102023104762B4 (de) |
| WO (1) | WO2024179848A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024121075A1 (de) * | 2024-07-24 | 2026-01-29 | Schwing Gmbh | Autobetonpumpe |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3682575A (en) * | 1970-12-10 | 1972-08-08 | Karl Guddal | Concrete pump |
| DE3910120A1 (de) * | 1989-03-29 | 1990-10-04 | Putzmeister Maschf | Steuerungsanordnung fuer eine zweizylinder-dickstoffpumpe |
| DE10150467A1 (de) * | 2001-10-16 | 2003-04-17 | Putzmeister Ag | Dickstoffpumpe mit Fördermengenregelung |
| ITMI20012246A1 (it) * | 2001-10-25 | 2003-04-25 | Cifa Spa | Pompa per calcestruzzo perfezionata con mezzi di regolazione automatica dell'azionamento della valvola ad s in funzione del tipo di calcestr |
| DE102021119181B3 (de) * | 2021-07-23 | 2022-08-18 | Schwing Gmbh | Zusatzaggregat und System zum elektrischen Antrieb einer Autobetonpumpe, und Autobetonpumpe |
-
2023
- 2023-02-27 DE DE102023104762.0A patent/DE102023104762B4/de active Active
-
2024
- 2024-02-15 WO PCT/EP2024/053870 patent/WO2024179848A1/de not_active Ceased
- 2024-02-15 EP EP24708361.1A patent/EP4673652B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024179848A1 (de) | 2024-09-06 |
| DE102023104762A1 (de) | 2024-08-29 |
| EP4673652B1 (de) | 2026-04-29 |
| DE102023104762B4 (de) | 2025-12-11 |
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