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EP3127856B1 - Hydraulic energy saving control system for forklift and method for lowering the operating energy consumption for forklift trucks - Google Patents

Hydraulic energy saving control system for forklift and method for lowering the operating energy consumption for forklift trucks Download PDF

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Publication number
EP3127856B1
EP3127856B1 EP16177465.8A EP16177465A EP3127856B1 EP 3127856 B1 EP3127856 B1 EP 3127856B1 EP 16177465 A EP16177465 A EP 16177465A EP 3127856 B1 EP3127856 B1 EP 3127856B1
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EP
European Patent Office
Prior art keywords
oil
variable displacement
displacement pump
valve
steering device
Prior art date
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EP16177465.8A
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German (de)
French (fr)
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EP3127856A1 (en
Inventor
Clayton Greenman
Mark Walker
Shi Fenghua
Lian Haihui
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Linde Material Handling GmbH
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Linde Material Handling GmbH
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Publication date
Priority claimed from CN201510481173.4A external-priority patent/CN105271070B/en
Priority claimed from CN201520591654.6U external-priority patent/CN204848151U/en
Application filed by Linde Material Handling GmbH filed Critical Linde Material Handling GmbH
Publication of EP3127856A1 publication Critical patent/EP3127856A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07568—Steering arrangements

Definitions

  • the present invention relates to the field of forklifts, in particular a hydraulic energy-saving control system for forklifts and a method for reducing the operating energy consumption for forklifts.
  • Forklifts are widely used in factories, warehouses, train stations, ports and other locations and are mainly used for loading, unloading, transport, stacking and stacking of goods when using the forklift over a short distance.
  • a series of operations are carried out by the interaction of the steering device and the operating valve of the forklift.
  • forklifts typically use a gear pump to supply oil to the steering device and the service valve.
  • the peculiarity of the gear pump in question is that the amount of oil output is fixed and is always in the state with high output.
  • the operating valve of the forklift truck only requires a large amount of flow when carrying out lifting operations, and only then does the requirement for special power and torque of the motor arise.
  • the forklift operating valve does not require a high flow rate during other operations has and for the engine the specified power and the corresponding consumption would not be required for the majority of the time.
  • the gear pump causes exhaust waste with an increase in the consumption of fuel, oil and heat loss, which increases the power consumption of the engine.
  • the EP 2 657 178 A2 discloses a drive system for an industrial truck with two variable displacement pumps each designed as load-sensing variable displacement pumps.
  • the first variable pump supplies the steering and the working hydraulics with pressure medium.
  • the second variable pump only supplies the working hydraulics with pressure medium.
  • the two variable displacement pumps are each controlled by the load pressure signal of the working hydraulics in the corresponding load pressure signal line if one or more consumers of the working hydraulics are to be actuated, so that when a control directional control valve of the working hydraulics is actuated, both variable displacement pumps always jointly supply the controlled function of the working hydraulics with pressure medium.
  • the present invention provides a hydraulic energy saving control system for forklift trucks and a method for reducing the operating energy consumption for forklift trucks, thereby overcoming the shortcomings of the prior art in the form of using a gear pump to supply oil.
  • the system also comprises a shuttle valve, a first input opening of the respective shuttle valve is connected to the load feedback signal output port of the above-mentioned steering device, while a second input port of the respective shuttle valve is connected to the load feedback signal output port of the above-mentioned operating valve, the output port of the respective shuttle valve connected to the load feedback signal reception port of the first variable pump referred to above is.
  • a connecting line with a control valve for the connection to the oil inlet opening of the above Steering device and the oil input opening of the operating valve is used, wherein the use of the above-mentioned control valve during the simultaneous operation of the above-mentioned steering device and the operating valve ensures that the above-mentioned first variable displacement pump provides priority to the above-mentioned steering device with oil.
  • control valve described above is a priority valve, the oil inlet opening of the relevant priority valve being connected to the oil outlet opening of the above-mentioned first variable displacement pump, one of the oil outlet openings of the relevant priority valve being connected to the oil inlet opening of the above-mentioned pump Steering device is connected while the other oil discharge opening is connected to the oil inlet opening of the above-mentioned operating valve, wherein a control pressure chamber of the respective priority valve is connected to the load feedback signal output port of the above-mentioned steering device.
  • the above-mentioned control unit comprises a measuring device and a processing device, the measuring device of measuring whether or not the operation control device provided in the forklift for driving the above-mentioned operating valve for operating with a large flow rate is in action or not, and serves to measure whether the rotational speed of the motor driving the second variable pump for operation reaches the predetermined value, the signal output connection of the relevant measuring device being connected to the input of the processing device while the Output of the processing device is connected to the control device of the above-mentioned second variable pump.
  • control unit is a mechanical operation control device which controls whether the control device of the above-mentioned second variable displacement pump receives power or not.
  • a one-way valve is also provided in the connecting path between the oil discharge opening of the above-mentioned second variable displacement pump and the oil inlet opening of the above-mentioned operating valve, which is authorized to allow the hydraulic oil to flow from the second variable displacement pump to the operating valve.
  • first variable displacement pump and the second variable displacement pump described above are driven by the same motor.
  • Method for reducing the operating energy consumption for forklift trucks which has a steering device and an operating valve, wherein at least a first variable pump and a second variable pump are provided, the first variable pump supplying the steering device and / or operating the steering device and / or operating valve of the forklift truck or the operating valve of the forklift with oil, and only when the flow valve of the operating valve of the forklift needs the second variable pump and the first variable pump to collectively supply the operating valve with oil.
  • the above-mentioned first variable displacement pump primarily supplies the steering device of the forklift truck with oil and then supplies the operating valve of the forklift truck with oil.
  • the present invention also includes a shuttle valve 4, wherein a first input port of the shuttle valve 4 in question is connected to the load feedback signal output port of the above-mentioned steering device 7, while a second input port of the shuttle valve 4 concerned is connected to the load feedback signal output port of the above designated operating valve 6 is connected, wherein the output opening of the respective shuttle valve 4 is connected to the load feedback signal receiving connection of the above-mentioned first variable pump 1.
  • control valve described above is a priority valve 5, the oil inlet opening of the relevant priority valve 5 being connected to the oil outlet opening of the first variable pump 1 referred to above, one of the oil outlet openings of the relevant priority valve 5 being connected to the oil inlet opening of the above designated steering device 7 is connected, while the other oil discharge port is connected to the oil inlet port of the above-mentioned operating valve 6, wherein a control pressure chamber of the respective priority valve 5 is connected to the load feedback signal output port of the above-mentioned steering device 7.
  • the above-mentioned control unit comprises a measuring device (not shown in the figure) and a processing device 3, wherein the measuring device measures whether the forklift for driving the above-mentioned operating valve 6 to operate with large Flow amount provided operation control device (for example, the hand lever for lifting operations of the forklift) is in action or not, and the measurement of whether the speed of the motor driving the second variable pump 2 to operate the predetermined Value reached, serves, the signal output connection of the relevant measuring device being connected to the input of the processing device 3, while the output of the processing device 3 is connected to the control device controlling the delivery volume of the above-mentioned second variable displacement pump 2.
  • the measuring device measures whether the forklift for driving the above-mentioned operating valve 6 to operate with large Flow amount provided operation control device (for example, the hand lever for lifting operations of the forklift) is in action or not, and the measurement of whether the speed of the motor driving the second variable pump 2 to operate the predetermined Value reached, serves, the signal output connection of the relevant measuring device being connected to the
  • a one-way valve (check valve) is also provided in the connection path between the oil discharge opening of the above-mentioned second variable displacement pump 2 and the oil discharge opening of the above-mentioned operating valve 6, which is authorized to prevent the flow of hydraulic oil from the second variable displacement pump 2 to allow the operating valve 6.
  • first variable pump 1 and the second variable pump 2 are each an axial piston pump.
  • the number of first variable pump 1 and second variable pump 2 described above is not limited to one pump in each case. If several first variable pumps 1 are provided, these several first variable pumps 1 can jointly perceive the supply of the operating valve 6 and / or the steering device 7 with oil. It can also be provided that some of the pumps perceive the supply of the operating valve 6 with oil and the rest of the pumps perceive the supply of the steering device 7 with oil.
  • At least one first is provided Variable displacement pump 1 and at least one second variable displacement pump 2, wherein during the operation of the steering device 7 and / or the operating valve 6 of the forklift truck, the first variable displacement pump 1 is responsible for supplying the steering device 7 and / or the operating valve 6 of the forklift truck with oil, while at high flow rates the Operating valve 6 of the forklift, the second variable pump 2 and the first variable pump 1 together perceive the supply of the operating valve 6 with oil.
  • the above-mentioned first variable pump 1 primarily supplies the steering device 7 of the forklift with oil and then supplies the operating valve 6 of the forklift with oil.
  • This is made possible by using the above-mentioned priority valve 5, and also using the above-mentioned shuttle valve 4 to understand the relationship between the load feedback signal receiving port of the first variable displacement pump and the load feedback signal output port of the steering device 7 and the load feedback signal output port of the operation valve 6 to coordinate. This prevents the steering device 7 and the operating valve 6 from activating the first variable pump 1 at the same time.
  • the method for reducing the operating power consumption for forklifts further comprises: providing the above-mentioned control unit, the control unit in question comprising a measuring device (not shown in the figure) and a processing device 3, the measuring device measuring whether the at the forklift for driving the above-mentioned operation valve 6 for operation with a large flow amount (for example, the hand lever for lifting operations of the forklift) is in action or not, and is used to measure whether the speed of the motor driving the second variable pump 2 for operation reaches the predetermined value for operating the hand lever for lifting operations.
  • the control takes place such that the second variable pump 2 receives electrical current for adjusting (increasing) the delivery volume in order to work with the first variable pump 1 perceive the supply of the operating valve 6 with oil.
  • the high flow quantity requirement of the operating valve 6 is thus covered.
  • the operation of the hydraulic energy saving control system for forklifts is as follows: During most operations in the operation of the forklift (except lifting operations), the second variable pump 2 receives no electric power and therefore the second variable pump 2 is in the standby mode with a capacity of approximately 0.
  • the load feedback signal receiving port of the first variable pump 1 When the load feedback signal receiving port of the first variable pump 1 is from the steering device 7 and / or the operating valve 6 receives a load feedback signal (this signal is a small amount of hydraulic oil), the swash plate of the first variable pump 1 comes into action (swings out) and outputs hydraulic oil to the steering device 7 or the operating valve 6 , If there is a simultaneous flow quantity requirement for the steering device 7 and the operating valve 6, the hydraulic oil output by the first variable pump 1 is given priority to the steering device 7 and only then to the operating valve 6, under the control of the priority valve 5.
  • the measuring device of the control unit measures whether or not the hand lever is operated for the lifting operation of the forklift. If the hand lever is actuated for the lifting operation of the forklift, the forklift will carry out the lifting operation and the operating valve 6 now requires a high flow rate.
  • the measuring device of the control unit transmits the measured signal to the processing device 3 and measures the speed of the motor 8. When the measured speed of the motor 8 reaches the predetermined value (for example 1400 revolutions / minute), the measuring device transmits the relevant signal to the processing device 3 and the processing device 3 controls accordingly that the second variable pump 2 receives electric current.
  • the output of the second variable pump 2 increases in a linear relationship and, together with the first variable pump 1, the operating valve 6 is supplied with oil, so that the high flow quantity requirement of the operating valve 6 is covered.
  • the second variable pump 2 stops supplying the operating valve 6 with oil, so that the operating valve 6 is only supplied with oil by the first variable pump 1 when there is a flow requirement for other operations of the forklift truck.
  • the present invention enables the adequate supply of oil according to the flow quantity requirement of the steering device 7 and the operation valve 6 of the forklift, avoids the generation of wasted capacity, and saves energy resources. In this way, the power consumption of the engine is reduced enormously and the engine is prevented from being in a high power state for a long time, which extends the life of the engine.
  • the first variable pump 1 and the second variable pump 2 collectively supply the operating valve 6 with oil and cover the high flow requirements of the operating valve 6, which accelerates the lifting operations of the forklift and thus increases the operating efficiency of the forklift.
  • control unit is a mechanical operation control device which controls whether the control device of the above-mentioned second variable displacement pump receives electrical current or not, for example a control switch.
  • the forklift driver actuates the hand lever for the lifting operation, only when the engine speed increases to the predetermined value (which the driver can judge from experience), the actuation of the control switch is required in order to receive power for the control device of the second variable displacement pump 2 allow.
  • the second variable pump together with the first variable pump, can perceive the supply of the operating valve with oil and cover the high flow volume requirement of the operating valve.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Description

TECHNISCHES GEBIETTECHNICAL AREA

Die vorliegende Erfindung betrifft das Gebiet der Gabelstapler, insbesondere ein hydraulisches energiesparendes Steuerungssystem für Gabelstapler sowie ein Verfahren zur Senkung des Betriebsenergieverbrauchs für Gabelstapler.The present invention relates to the field of forklifts, in particular a hydraulic energy-saving control system for forklifts and a method for reducing the operating energy consumption for forklifts.

STAND DER TECHNIKSTATE OF THE ART

Gabelstapler werden umfassend in Fabriken, Lagern, Bahnhöfen, Häfen und anderen Örtlichkeiten verwendet und dienen hauptsächlich dem Beladen und Entladen, dem Transport, der Stapelung und der Stapelentnahme von Gütern bei Einsatz der Gabelstapler über kurze Distanz. Bei dem Betrieb eines Gabelstaplers wird durch Zusammenwirken der Lenkvorrichtung und des Betriebsventils des Gabelstaplers eine Reihe von Operationen ausgeführt. Gegenwärtig wird bei Gabelstaplern normalerweise eine Zahnradpumpe zur Versorgung der Lenkvorrichtung und des Betriebsventils mit Öl verwendet. Die Besonderheit der betreffenden Zahnradpumpe besteht darin, dass die Menge der Ölausgabe festgelegt ist und sich immer im Zustand mit hohem Ausstoß befindet. Allerdings weist das Betriebsventil des Gabelstaplers nur bei der Durchführung von Hebeoperationen einen hohen Flussmengenbedarf auf und erst dann entsteht die Anforderung an besondere Leistung und ein besonderes Drehmoment des Motors. Dies bedeutet, dass das Betriebsventil des Gabelstaplers während anderer Einsatzoperationen keinen hohen Flussmengenbedarf aufweist und für den Motor während der überwiegenden Zeit die genannte Leistung und der entsprechende Verbrauch nicht erforderlich wären. Bei Gabelstaplern nach dem Stand der Technik entstehen durch die Zahnradpumpe zu Zeiten ohne großen Flussmengenbedarf des Betriebsventils Ausstoßvergeudungen mit einer Steigerung des Verbrauchs an Kraftstoff, Öl und Wärmeverlust, was den Leistungsverbrauch des Motors erhöht.Forklifts are widely used in factories, warehouses, train stations, ports and other locations and are mainly used for loading, unloading, transport, stacking and stacking of goods when using the forklift over a short distance. In the operation of a forklift, a series of operations are carried out by the interaction of the steering device and the operating valve of the forklift. At present, forklifts typically use a gear pump to supply oil to the steering device and the service valve. The peculiarity of the gear pump in question is that the amount of oil output is fixed and is always in the state with high output. However, the operating valve of the forklift truck only requires a large amount of flow when carrying out lifting operations, and only then does the requirement for special power and torque of the motor arise. This means that the forklift operating valve does not require a high flow rate during other operations has and for the engine the specified power and the corresponding consumption would not be required for the majority of the time. In the case of forklifts according to the state of the art, at times when the operating valve does not require a large amount of flow, the gear pump causes exhaust waste with an increase in the consumption of fuel, oil and heat loss, which increases the power consumption of the engine.

Die EP 2 657 178 A2 offenbart ein Antriebssystem für ein Flurförderzeug mit zwei jeweils als Load-Sensing Verstellpumpen ausgebildeten Verstellpumpen. Die erste Verstellpumpe versorgt die Lenkung und die Arbeitshydraulik mit Druckmittel. Die zweite Verstellpumpe versorgt nur die Arbeitshydraulik mit Druckmittel. Die beiden Verstellpumpen sind jeweils von dem Lastdruckssignal der Arbeitshydraulik in der entsprechenden Lastdrucksignalleitung angesteuert, wenn ein oder mehrere Verbraucher der Arbeitshydraulik betätigt werden sollen, so dass bei der Betätigung eines Steuerwegeventils der Arbeitshydraulik immer beide Verstellpumpen gemeinsam die angesteuerte Funktion der Arbeitshydraulik mit Druckmittel versorgen.The EP 2 657 178 A2 discloses a drive system for an industrial truck with two variable displacement pumps each designed as load-sensing variable displacement pumps. The first variable pump supplies the steering and the working hydraulics with pressure medium. The second variable pump only supplies the working hydraulics with pressure medium. The two variable displacement pumps are each controlled by the load pressure signal of the working hydraulics in the corresponding load pressure signal line if one or more consumers of the working hydraulics are to be actuated, so that when a control directional control valve of the working hydraulics is actuated, both variable displacement pumps always jointly supply the controlled function of the working hydraulics with pressure medium.

INHALT DER ERFINDUNGCONTENT OF THE INVENTION

Die vorliegende Erfindung stellt ein hydraulisches energiesparendes Steuerungssystem für Gabelstapler sowie ein Verfahren zur Senkung des Betriebsenergieverbrauchs für Gabelstapler bereit, wodurch die Unzulänglichkeiten nach dem Stand der Technik in Gestalt der Verwendung einer Zahnradpumpe für die Versorgung mit Öl überwunden werden.The present invention provides a hydraulic energy saving control system for forklift trucks and a method for reducing the operating energy consumption for forklift trucks, thereby overcoming the shortcomings of the prior art in the form of using a gear pump to supply oil.

Die technische Konzeption der vorliegenden Erfindung zur Lösung des genannten Problems sieht ein hydraulisches energiesparendes Steuerungssystem für Gabelstapler vor, welches eine Lenkvorrichtung und ein Betriebsventil für Gabelstapler umfasst, wobei die betreffende Lenkvorrichtung und das Betriebsventil jeweils einen Lastrückkopplungssignal-Ausgabeanschluss aufweisen, wobei das System außerdem umfasst:

  • zumindest eine erste als Load-Sensing-Verstellpumpe ausgebildete Verstellpumpe, welche der Versorgung der vorstehend bezeichneten Lenkvorrichtung und/oder des Betriebsventils mit Öl dient, wobei die betreffende erste Verstellpumpe einen Lastrückkopplungssignal-Empfangsanschluss aufweist, wobei der betreffende Lastrückkopplungssignal-Empfangsanschluss mit dem Lastrückkopplungssignal-Ausgabeanschluss der Lenkvorrichtung und dem Lastrückkopplungssignal-Ausgabeanschluss des Betriebsventils verbunden ist, wobei die Ölausgabeöffnung der betreffenden ersten Verstellpumpe mit der Öleingabeöffnung der vorstehend bezeichneten Lenkvorrichtung und der Öleingabeöffnung des Betriebsventils verbunden ist;
  • zumindest eine zweite, als elektrisch im Fördervolumen verstellbare Verstellpumpe ausgebildete Verstellpumpe, welche dazu dient, nur bei hohem Flussmengenbedarf des vorstehend bezeichneten Betriebsventils gemeinsam mit der ersten Verstellpumpe die Versorgung des Betriebsventils mit Öl wahrzunehmen, wobei die Ölausgabeöffnung der betreffenden zweiten Verstellpumpe an die Öleingabeöffnung des Betriebsventils angeschlossen ist;
  • eine Steuerungseinheit, welche mit der zweiten Verstellpumpe verbunden ist und der Steuerung dahingehend dient, ob die zweite Verstellpumpe Öl ausgibt oder nicht.
The technical concept of the present invention for solving the problem mentioned provides a hydraulic energy-saving control system for A forklift comprising a steering device and an operating valve for forklifts, the respective steering device and the operating valve each having a load feedback signal output port, the system further comprising:
  • at least one first variable-displacement pump designed as a load-sensing variable-displacement pump, which serves to supply the steering device and / or the operating valve referred to above with oil, the first variable-displacement pump in question having a load feedback signal reception connection, the load feedback signal reception connection in question having the load feedback signal output connection the steering device and the load feedback signal output port of the operation valve are connected, wherein the oil discharge opening of the first variable pump in question is connected to the oil inlet opening of the above-mentioned steering device and the oil inlet opening of the operation valve;
  • at least one second variable displacement pump, which is designed as an electrically variable displacement pump and is used to supply the operating valve with oil only when the above-mentioned operating valve requires a large amount of flow, the oil supply opening of the relevant second variable pump to the oil inlet opening of the operating valve connected;
  • a control unit which is connected to the second variable displacement pump and serves to control whether the second variable displacement pump outputs oil or not.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass das System außerdem ein Wechselventil umfasst, wobei eine erste Eingabeöffnung des betreffenden Wechselventils an den Lastrückkopplungssignal-Ausgabeanschluss der vorstehend bezeichneten Lenkvorrichtung angeschlossen ist, während eine zweite Eingabeöffnung des betreffenden Wechselventils an den Lastrückkopplungssignal-Ausgabeanschluss des vorstehend bezeichneten Betriebsventils angeschlossen ist, wobei die Ausgabeöffnung des betreffenden Wechselventils an den Lastrückkopplungssignal-Empfangsanschluss der vorstehend bezeichneten ersten Verstellpumpe angeschlossen ist.In a practical exemplary embodiment it is provided that the system also comprises a shuttle valve, a first input opening of the respective shuttle valve is connected to the load feedback signal output port of the above-mentioned steering device, while a second input port of the respective shuttle valve is connected to the load feedback signal output port of the above-mentioned operating valve, the output port of the respective shuttle valve connected to the load feedback signal reception port of the first variable pump referred to above is.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass für die Ölausgabeöffnung der vorstehend bezeichneten ersten Verstellpumpe eine Verbindungsleitung mit einem Steuerungsventil für die Verbindung mit der Öleingabeöffnung der vorstehend bezeichneten Lenkvorrichtung und der Öleingabeöffnung des Betriebsventils Verwendung findet, wobei die Verwendung des vorstehend bezeichneten Steuerungsventils während des gleichzeitigen Betriebs der vorstehend bezeichneten Lenkvorrichtung und des Betriebsventils dafür sorgt, dass die vorstehend bezeichnete erste Verstellpumpe mit Vorrang die vorstehend bezeichnete Lenkvorrichtung mit Öl versorgt.In a practical exemplary embodiment, it is provided that for the oil discharge opening of the first variable pump referred to above, a connecting line with a control valve for the connection to the oil inlet opening of the above Steering device and the oil input opening of the operating valve is used, wherein the use of the above-mentioned control valve during the simultaneous operation of the above-mentioned steering device and the operating valve ensures that the above-mentioned first variable displacement pump provides priority to the above-mentioned steering device with oil.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass es sich bei dem vorstehend bezeichneten Steuerungsventil um ein Vorrangventil handelt, wobei die Öleingabeöffnung des betreffenden Vorrangventils an die Ölausgabeöffnung der vorstehend bezeichneten ersten Verstellpumpe angeschlossen ist, wobei eine der Ölausgabeöffnungen des betreffenden Vorrangventils an die Öleingabeöffnung der vorstehend bezeichneten Lenkvorrichtung angeschlossen ist, während die andere Ölausgabeöffnung an die Öleingabeöffnung des vorstehend bezeichneten Betriebsventils angeschlossen ist, wobei ein Steuerdruckraum des betreffenden Vorrangventils an den Lastrückkopplungssignal-Ausgabeanschluss der vorstehend bezeichneten Lenkvorrichtung angeschlossen ist.In a practical exemplary embodiment, it is provided that the control valve described above is a priority valve, the oil inlet opening of the relevant priority valve being connected to the oil outlet opening of the above-mentioned first variable displacement pump, one of the oil outlet openings of the relevant priority valve being connected to the oil inlet opening of the above-mentioned pump Steering device is connected while the other oil discharge opening is connected to the oil inlet opening of the above-mentioned operating valve, wherein a control pressure chamber of the respective priority valve is connected to the load feedback signal output port of the above-mentioned steering device.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass die vorstehend bezeichnete Steuerungseinheit eine Messvorrichtung und eine Verarbeitungsvorrichtung umfasst, wobei die Messvorrichtung der Messung, ob die bei dem Gabelstapler zum Antrieb des vorstehend bezeichneten Betriebsventils zum Betrieb mit großer Flussmenge vorgesehene Operationssteuerungsvorrichtung in Aktion ist oder nicht, und der Messung, ob die Drehzahl des die zweite Verstellpumpe zum Betrieb antreibenden Motors den zuvor festgelegten Wert erreicht, dient, wobei der Signalausgabeanschluss der betreffenden Messvorrichtung mit der Eingabe der Verarbeitungsvorrichtung verbunden ist, während die Ausgabe der Verarbeitungsvorrichtung mit der Steuerungsvorrichtung der vorstehend bezeichneten zweiten Verstellpumpe verbunden ist.In a practical embodiment, it is provided that the above-mentioned control unit comprises a measuring device and a processing device, the measuring device of measuring whether or not the operation control device provided in the forklift for driving the above-mentioned operating valve for operating with a large flow rate is in action or not, and serves to measure whether the rotational speed of the motor driving the second variable pump for operation reaches the predetermined value, the signal output connection of the relevant measuring device being connected to the input of the processing device while the Output of the processing device is connected to the control device of the above-mentioned second variable pump.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass es sich bei der vorstehend bezeichneten Steuerungseinheit um eine mechanische Operationssteuerungsvorrichtung handelt, welche steuert, ob die Steuerungsvorrichtung der vorstehend bezeichneten zweiten Verstellpumpe Strom erhält oder nicht.In a practical exemplary embodiment, it is provided that the above-mentioned control unit is a mechanical operation control device which controls whether the control device of the above-mentioned second variable displacement pump receives power or not.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass in dem Verbindungsweg zwischen der Ölausgabeöffnung der vorstehend bezeichneten zweiten Verstellpumpe und der Öleingabeöffnung des vorstehend bezeichneten Betriebsventils außerdem ein Einwegventil vorgesehen ist, welches berechtigt ist, dem Hydrauliköl den Fluss von der zweiten Verstellpumpe zu dem Betriebsventil zu gestatten.In a practical exemplary embodiment, it is provided that a one-way valve is also provided in the connecting path between the oil discharge opening of the above-mentioned second variable displacement pump and the oil inlet opening of the above-mentioned operating valve, which is authorized to allow the hydraulic oil to flow from the second variable displacement pump to the operating valve.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass der Antrieb der vorstehend bezeichneten ersten Verstellpumpe und der zweiten Verstellpumpe durch denselben Motor erfolgt.In a practical exemplary embodiment it is provided that the first variable displacement pump and the second variable displacement pump described above are driven by the same motor.

Verfahren zur Senkung des Betriebsenergieverbrauchs für Gabelstapler, der eine Lenkvorrichtung und ein Betriebsventil aufweist, wobei zumindest eine erste Verstellpumpe und eine zweite Verstellpumpe bereitgestellt werden, wobei während des Betriebs der Lenkvorrichtung und/oder des Betriebsventils des Gabelstaplers die erste Verstellpumpe die Versorgung der Lenkvorrichtung und/oder des Betriebsventils des Gabelstaplers mit Öl wahrnimmt, und nur während bei hohem Flussmengenbedarf des Betriebsventils des Gabelstaplers die zweite Verstellpumpe und die erste Verstellpumpe gemeinsam die Versorgung des Betriebsventils mit Öl wahrnehmen.Method for reducing the operating energy consumption for forklift trucks, which has a steering device and an operating valve, wherein at least a first variable pump and a second variable pump are provided, the first variable pump supplying the steering device and / or operating the steering device and / or operating valve of the forklift truck or the operating valve of the forklift with oil, and only when the flow valve of the operating valve of the forklift needs the second variable pump and the first variable pump to collectively supply the operating valve with oil.

Bei einem praktischen Ausführungsbeispiel wird vorgesehen, dass während des gleichzeitigen Betriebs der Lenkvorrichtung und des Betriebsventils des Gabelstaplers die vorstehend bezeichnete erste Verstellpumpe mit Vorrang die Lenkvorrichtung des Gabelstaplers mit Öl versorgt und danach das Betriebsventil des Gabelstaplers mit Öl versorgt.In a practical embodiment it is provided that during the simultaneous operation of the steering device and the operating valve of the forklift truck, the above-mentioned first variable displacement pump primarily supplies the steering device of the forklift truck with oil and then supplies the operating valve of the forklift truck with oil.

Im Vergleich zum Stand der Technik bietet die vorliegende Erfindung die folgenden Vorteile:

  1. 1. Wegen des abgestimmten Betriebs von erster Verstellpumpe und zweiter Verstellpumpe bei der vorliegenden Erfindung wird erreicht, dass die Lenkvorrichtung und/oder das Betriebsventil des Gabelstaplers während der meisten Operationen durch die erste Verstellpumpe mit Öl versorgt werden. Nur bei hohem Flussmengenbedarf des Betriebsventils (beispielsweise bei Hebeoperationen des Gabelstaplers) nehmen die erste Verstellpumpe und die zweite Verstellpumpe gemeinsam die Versorgung des Betriebsventils mit Öl wahr. Auf diese Weise ermöglicht die vorliegende Erfindung, dass gemäß dem Flussmengenbedarf der Lenkvorrichtung und des Betriebsventils des Gabelstaplers die angemessene Versorgung mit Öl erfolgt, das Entstehen von Kapazitätsverschwendung vermieden wird und Energieressourcen eingespart werden. Somit wird der Leistungsverbrauch des Motors enorm gesenkt und es wird vermieden, dass sich der Motor über lange Zeit im Zustand hoher Leistung befindet, was die Lebensdauer des Motors verlängert.
  2. 2. Bei der vorliegenden Erfindung wird ein Wechselventil verwendet, um die Beziehung zwischen dem Lastrückkopplungssignal-Empfangsanschluss der ersten Verstellpumpe und dem Lastrückkopplungssignal-Ausgabeanschluss der Lenkvorrichtung und dem Lastrückkopplungssignal-Ausgabeanschluss des Betriebsventils zu koordinieren. Somit wird verhindert, dass die Lenkvorrichtung und das Betriebsventil die erste Verstellpumpe gleichzeitig aktivieren.
  3. 3. Bei der vorliegenden Erfindung wird weiterhin ein Vorrangventil vorgesehen, welches für die Abfolge der Versorgung von Lenkvorrichtung und Betriebsventil mit Öl durch die erste Verstellpumpe sorgt. Somit kann bei gleichzeitigem hohem Flussmengenbedarf von Lenkvorrichtung und Betriebsventil gewährleistet werden, dass die erste Verstellpumpe die Lenkvorrichtung mit Vorrang mit Öl versorgt und die Betriebsaktionen des Gabelstaplers besser koordiniert und rationaler sind.
  4. 4. Die Steuerungseinheit umfasst bei der vorliegenden Erfindung eine Messvorrichtung und eine Verarbeitungsvorrichtung, wobei die Messvorrichtung der Messung, ob die bei dem Gabelstapler zum Antrieb des vorstehend bezeichneten Betriebsventils zum Betrieb mit großer Flussmenge vorgesehene Operationssteuerungsvorrichtung in Aktion ist oder nicht, und der Messung, ob die Drehzahl des die zweite Verstellpumpe zum Betrieb antreibenden Motors den zuvor festgelegten Wert erreicht, dient. Auf diese Weise ist die Ausgestaltung des erfindungsgemäßen hydraulischen energiesparenden Steuerungssystems intelligent und einfacher zu handhaben.
The present invention offers the following advantages over the prior art:
  1. 1. Because of the coordinated operation of the first variable pump and the second variable pump in the present invention, the steering device and / or the operating valve of the forklift truck are supplied with oil by the first variable pump during most operations. The first variable displacement pump and the second variable displacement pump jointly take care of the supply of the operating valve with oil only when there is a high flow requirement of the operating valve (for example when lifting operations of the forklift truck). In this way, the present invention enables the appropriate supply of oil to be made in accordance with the flow quantity requirement of the steering device and the operating valve of the forklift truck, the generation of wasted capacity is avoided, and energy resources are saved. The power consumption of the engine is thus reduced enormously and the engine is prevented from being in a high power state for a long time, which extends the life of the engine.
  2. 2. In the present invention, a shuttle valve is used to determine the relationship between the load feedback signal receiving port of the first variable pump and the To coordinate the load feedback signal output port of the steering device and the load feedback signal output port of the operation valve. This prevents the steering device and the operating valve from activating the first variable pump at the same time.
  3. 3. In the present invention, a priority valve is also provided, which ensures the sequence of the supply of the steering device and operating valve with oil by the first variable pump. In this way, while the flow rate of the steering device and operating valve is high, it can be ensured that the first variable pump supplies the steering device with oil as a matter of priority and that the operating actions of the forklift are better coordinated and more rational.
  4. 4. The control unit in the present invention includes a measuring device and a processing device, the measuring device of measuring whether or not the operation control device provided in the forklift for driving the above-mentioned operation valve to operate with a large flow amount is in operation, and measuring whether the speed of the motor driving the second variable pump for operation reaches the previously defined value. In this way, the design of the hydraulic energy-saving control system according to the invention is intelligent and easier to handle.

Nachstehend aufgeführt erfolgt anhand der beigefügten Abbildungen und anhand praktischer Ausführungsbeispiele eine weitere detaillierte Erläuterung der vorliegenden Erfindung, wobei das erfindungsgemäße hydraulische energiesparende Steuerungssystem für Gabelstapler in keiner Weise auf die beschriebenen praktischen Ausführungsbeispiele beschränkt ist.A further detailed explanation of the present invention is given below with reference to the attached figures and practical examples, the hydraulic according to the invention Energy-saving control system for forklifts is in no way limited to the practical embodiments described.

ERLÄUTERUNG DER ABBILDUNGENEXPLANATION OF THE PICTURES

Bei Abbildung 1 handelt es sich um die Darstellung des Prinzip-Schemas der vorliegenden Erfindung.at illustration 1 it is the representation of the principle scheme of the present invention.

PRAKTISCHE AUSFÜHRUNGSBEISPIELEPRACTICAL EXAMPLES Praktisches Ausführungsbeispiel 1Practical embodiment 1

Wie in Abbildung 1 gezeigt handelt es sich um ein hydraulisches energiesparendes Steuerungssystem für Gabelstapler, welches eine Lenkvorrichtung 7 und ein Betriebsventil 6 des Gabelstaplers umfasst, wobei die Lenkvorrichtung 7 der Zuteilung von Hydrauliköl während der Durchführung von Lenkvorgängen des Gabelstaplers dient und das Betriebsventil 6 der Zuteilung von Hydrauliköl bei Operationen des Gabelstaplers wie Heben/Senken, und/oder Neigung nach vorne oder hinten, und/oder Bewegungen nach links und rechts, und/oder Ausfahren/Einholen der Gabel dient. Die Lenkvorrichtung 7 und das Betriebsventil 6 weisen jeweils einen Lastrückkopplungssignal-Ausgabeanschluss auf. Die vorliegende Erfindung umfasst außerdem:

  • eine erste Verstellpumpe 1 (Load-Sensing-Verstellpumpe), welche der Versorgung der vorstehend bezeichneten Lenkvorrichtung 7 und/oder des Betriebsventils 6 mit Öl dient, wobei die betreffende erste Verstellpumpe 1 einen Lastrückkopplungssignal-Empfangsanschluss (Load-Sensing-Empfangsanschluss) aufweist, wobei der betreffende Lastrückkopplungssignal-Empfangsanschluss mit dem Lastrückkopplungssignal-Ausgabeanschluss (Load-Sensing-Ausgabeanschluss) der Lenkvorrichtung 7 und dem Lastrückkopplungssignal-Ausgabeanschluss (Load-Sensing-Ausgabeanschluss) des Betriebsventils 6 verbunden ist, wobei die Ölausgabeöffnung der betreffenden ersten Verstellpumpe 1 mit der Öleingabeöffnung der vorstehend bezeichneten Lenkvorrichtung 7 und der Öleingabeöffnung des Betriebsventils 6 verbunden ist;
  • eine zweite Verstellpumpe 2 (elektrisch verstellbare Verstellpumpe), welche dazu dient, bei hohem Flussmengenbedarf des vorstehend bezeichneten Betriebsventils 6 gemeinsam mit der ersten Verstellpumpe 1 die Versorgung des Betriebsventils 6 mit Öl wahrzunehmen, wobei die Ölausgabeöffnung der betreffenden zweiten Verstellpumpe 2 an die Öleingabeöffnung des Betriebsventils 6 angeschlossen ist;
  • eine Steuerungseinheit, welche mit der zweiten Verstellpumpe 2 verbunden ist und der Steuerung dahingehend, ob die zweite Verstellpumpe 2 Öl ausgibt oder nicht, dient.
As in illustration 1 shown is a hydraulic energy-saving control system for forklift trucks, which comprises a steering device 7 and an operating valve 6 of the forklift truck, wherein the steering device 7 serves for the allocation of hydraulic oil during the execution of steering operations of the forklift truck and the operating valve 6 for the allocation of hydraulic oil during operations the forklift such as lifting / lowering, and / or tilting forward or backward, and / or movements to the left and right, and / or extending / retracting the fork. The steering device 7 and the operation valve 6 each have a load feedback signal output terminal. The present invention also includes:
  • a first variable displacement pump 1 (load-sensing variable displacement pump), which serves to supply the above-mentioned steering device 7 and / or the operating valve 6 with oil, the relevant first variable displacement pump 1 having a load feedback signal reception connection (load-sensing reception connection), wherein the relevant load feedback signal receiving terminal with the load feedback signal output terminal (load sensing output terminal) of the steering device 7 and the load feedback signal output terminal (load sensing output terminal) of the operating valve 6 is connected, wherein the oil discharge opening of the respective first variable pump 1 is connected to the oil inlet opening of the above-mentioned steering device 7 and the oil inlet opening of the operating valve 6;
  • a second variable displacement pump 2 (electrically adjustable variable displacement pump), which serves to supply oil to the operating valve 6 together with the first variable displacement pump 1 when the flow valve requirement of the above-mentioned operating valve 6 is high, the oil output opening of the relevant second variable pump 2 to the oil input opening of the operating valve 6 is connected;
  • a control unit which is connected to the second variable pump 2 and serves to control whether the second variable pump 2 outputs oil or not.

Bei dem vorliegenden praktischen Ausführungsbeispiel umfasst die vorliegende Erfindung außerdem ein Wechselventil 4, wobei eine erste Eingabeöffnung des betreffenden Wechselventils 4 an den Lastrückkopplungssignal-Ausgabeanschluss der vorstehend bezeichneten Lenkvorrichtung 7 angeschlossen ist, während eine zweite Eingabeöffnung des betreffenden Wechselventils 4 an den Lastrückkopplungssignal-Ausgabeanschluss des vorstehend bezeichneten Betriebsventils 6 angeschlossen ist, wobei die Ausgabeöffnung des betreffenden Wechselventils 4 an den Lastrückkopplungssignal-Empfangsanschluss der vorstehend bezeichneten ersten Verstellpumpe 1 angeschlossen ist.In the present practical embodiment, the present invention also includes a shuttle valve 4, wherein a first input port of the shuttle valve 4 in question is connected to the load feedback signal output port of the above-mentioned steering device 7, while a second input port of the shuttle valve 4 concerned is connected to the load feedback signal output port of the above designated operating valve 6 is connected, wherein the output opening of the respective shuttle valve 4 is connected to the load feedback signal receiving connection of the above-mentioned first variable pump 1.

Bei dem vorliegenden praktischen Ausführungsbeispiel ist vorgesehen, dass für die Ölausgabeöffnung der vorstehend bezeichneten ersten Verstellpumpe 1 eine Verbindungsleitung mit einem Steuerungsventil für die Verbindung mit der Öleingabeöffnung der vorstehend bezeichneten Lenkvorrichtung 7 und der Öleingabeöffnung des Betriebsventils 6 Verwendung findet, wobei die Verwendung des vorstehend bezeichneten Steuerungsventils während des gleichzeitigen Betriebs der vorstehend bezeichneten Lenkvorrichtung 7 und des Betriebsventils 6 dafür sorgt, dass die vorstehend bezeichnete erste Verstellpumpe 1 mit Vorrang die vorstehend bezeichnete Lenkvorrichtung 7 mit Öl versorgt. Konkret wird vorgesehen, dass es sich bei dem vorstehend bezeichneten Steuerungsventil um ein Vorrangventil 5 handelt, wobei die Öleingabeöffnung des betreffenden Vorrangventils 5 an die Ölausgabeöffnung der vorstehend bezeichneten ersten Verstellpumpe 1 angeschlossen ist, wobei eine der Ölausgabeöffnungen des betreffenden Vorrangventils 5 an die Öleingabeöffnung der vorstehend bezeichneten Lenkvorrichtung 7 angeschlossen ist, während die andere Ölausgabeöffnung an die Öleingabeöffnung des vorstehend bezeichneten Betriebsventils 6 angeschlossen ist, wobei ein Steuerdruckraum des betreffenden Vorrangventils 5 an den Lastrückkopplungssignal-Ausgabeanschluss der vorstehend bezeichneten Lenkvorrichtung 7 angeschlossen ist.In the present practical exemplary embodiment, provision is made for one for the oil discharge opening of the first variable pump 1 described above Connection line with a control valve for connection to the oil inlet opening of the above-mentioned steering device 7 and the oil inlet opening of the operating valve 6 is used, the use of the above-mentioned control valve during the simultaneous operation of the above-mentioned steering device 7 and the operating valve 6 ensuring that the above designated first variable pump 1 supplies the above-mentioned steering device 7 with oil. Specifically, it is provided that the control valve described above is a priority valve 5, the oil inlet opening of the relevant priority valve 5 being connected to the oil outlet opening of the first variable pump 1 referred to above, one of the oil outlet openings of the relevant priority valve 5 being connected to the oil inlet opening of the above designated steering device 7 is connected, while the other oil discharge port is connected to the oil inlet port of the above-mentioned operating valve 6, wherein a control pressure chamber of the respective priority valve 5 is connected to the load feedback signal output port of the above-mentioned steering device 7.

Bei dem vorliegenden praktischen Ausführungsbeispiel ist vorgesehen, dass die vorstehend bezeichnete Steuerungseinheit eine Messvorrichtung (in der Abbildung nicht gezeigt) und eine Verarbeitungsvorrichtung 3 umfasst, wobei die Messvorrichtung der Messung, ob die bei dem Gabelstapler zum Antrieb des vorstehend bezeichneten Betriebsventils 6 zum Betrieb mit großer Flussmenge vorgesehene Operationssteuerungsvorrichtung (beispielsweise der Handhebel für Hebeoperationen des Gabelstaplers) in Aktion ist oder nicht, und der Messung, ob die Drehzahl des die zweite Verstellpumpe 2 zum Betrieb antreibenden Motors den zuvor festgelegten Wert erreicht, dient, wobei der Signalausgabeanschluss der betreffenden Messvorrichtung mit der Eingabe der Verarbeitungsvorrichtung 3 verbunden ist, während die Ausgabe der Verarbeitungsvorrichtung 3 mit der das Fördervolumen steuernden Steuerungsvorrichtung der vorstehend bezeichneten zweiten Verstellpumpe 2 verbunden ist.In the present practical embodiment, it is provided that the above-mentioned control unit comprises a measuring device (not shown in the figure) and a processing device 3, wherein the measuring device measures whether the forklift for driving the above-mentioned operating valve 6 to operate with large Flow amount provided operation control device (for example, the hand lever for lifting operations of the forklift) is in action or not, and the measurement of whether the speed of the motor driving the second variable pump 2 to operate the predetermined Value reached, serves, the signal output connection of the relevant measuring device being connected to the input of the processing device 3, while the output of the processing device 3 is connected to the control device controlling the delivery volume of the above-mentioned second variable displacement pump 2.

Bei dem vorliegenden praktischen Ausführungsbeispiel ist vorgesehen, dass in dem Verbindungsweg zwischen der Ölausgabeöffnung der vorstehend bezeichneten zweiten Verstellpumpe 2 und der Öleingabeöffnung des vorstehend bezeichneten Betriebsventils 6 außerdem ein Einwegventil (Rückschlagventil) vorgesehen ist, welches berechtigt ist, dem Hydrauliköl den Fluss von der zweiten Verstellpumpe 2 zu dem Betriebsventil 6 zu gestatten.In the present practical embodiment, it is provided that a one-way valve (check valve) is also provided in the connection path between the oil discharge opening of the above-mentioned second variable displacement pump 2 and the oil discharge opening of the above-mentioned operating valve 6, which is authorized to prevent the flow of hydraulic oil from the second variable displacement pump 2 to allow the operating valve 6.

Bei dem vorliegenden praktischen Ausführungsbeispiel ist vorgesehen, dass der Antrieb der vorstehend bezeichneten ersten Verstellpumpe 1 und der zweiten Verstellpumpe 2 durch denselben Motor 8 erfolgt. Bei der betreffenden ersten Verstellpumpe 1 und der zweiten Verstellpumpe 2 handelt es sich jeweils um eine Axialkolbenpumpe. Die Anzahl von vorstehend bezeichneter erster Verstellpumpe 1 und zweiter Verstellpumpe 2 ist nicht auf jeweils eine Pumpe beschränkt. Wenn mehrere erste Verstellpumpen 1 vorgesehen sind, können diese mehreren ersten Verstellpumpen 1 gemeinsam die Versorgung des Betriebsventils 6 und/oder der Lenkvorrichtung 7 mit Öl wahrnehmen. Ebenso kann vorgesehen werden, dass ein Teil der Pumpen die Versorgung des Betriebsventils 6 mit Öl wahrnimmt und der Rest der Pumpen die Versorgung der Lenkvorrichtung 7 mit Öl wahrnimmt.In the present practical exemplary embodiment, provision is made for the first variable pump 1 and the second variable pump 2 to be driven by the same motor 8. The respective first variable pump 1 and the second variable pump 2 are each an axial piston pump. The number of first variable pump 1 and second variable pump 2 described above is not limited to one pump in each case. If several first variable pumps 1 are provided, these several first variable pumps 1 can jointly perceive the supply of the operating valve 6 and / or the steering device 7 with oil. It can also be provided that some of the pumps perceive the supply of the operating valve 6 with oil and the rest of the pumps perceive the supply of the steering device 7 with oil.

Verfahren zur Senkung des Betriebsenergieverbrauchs für Gabelstapler nach der vorliegenden Erfindung: Es erfolgt die Bereitstellung von zumindest einer ersten Verstellpumpe 1 und zumindest einer zweiten Verstellpumpe 2, wobei während des Betriebs der Lenkvorrichtung 7 und/oder des Betriebsventils 6 des Gabelstaplers die erste Verstellpumpe 1 die Versorgung der Lenkvorrichtung 7 und/oder des Betriebsventils 6 des Gabelstaplers mit Öl wahrnimmt, während bei hohem Flussmengenbedarf des Betriebsventils 6 des Gabelstaplers die zweite Verstellpumpe 2 und die erste Verstellpumpe 1 gemeinsam die Versorgung des Betriebsventils 6 mit Öl wahrnehmen. Insbesondere wird vorgesehen, dass während des gleichzeitigen Betriebs der Lenkvorrichtung 7 und des Betriebsventils 6 des Gabelstaplers die vorstehend bezeichnete erste Verstellpumpe 1 mit Vorrang die Lenkvorrichtung 7 des Gabelstaplers mit Öl versorgt und danach das Betriebsventil 6 des Gabelstaplers mit Öl versorgt. Dies wird durch die Verwendung des vorstehend bezeichneten Vorrangventils 5 ermöglicht, wobei außerdem die Verwendung des vorstehend bezeichneten Wechselventils 4 erfolgt, um die Beziehung zwischen dem Lastrückkopplungssignal-Empfangsanschluss der ersten Verstellpumpe und dem Lastrückkopplungssignal-Ausgabeanschluss der Lenkvorrichtung 7 und dem Lastrückkopplungssignal-Ausgabeanschluss des Betriebsventils 6 zu koordinieren. Somit wird verhindert, dass die Lenkvorrichtung 7 und das Betriebsventil 6 die erste Verstellpumpe 1 gleichzeitig aktivieren. Das Verfahren zur Senkung des Betriebsenergieverbrauchs für Gabelstapler nach der vorliegenden Erfindung umfasst außerdem: die Bereitstellung der vorstehend bezeichneten Steuerungseinheit, wobei die betreffende Steuerungseinheit eine Messvorrichtung (in der Abbildung nicht gezeigt) und eine Verarbeitungsvorrichtung 3 umfasst, wobei die Messvorrichtung der Messung, ob die bei dem Gabelstapler zum Antrieb des vorstehend bezeichneten Betriebsventils 6 zum Betrieb mit großer Flussmenge vorgesehene Operationssteuerungsvorrichtung (beispielsweise der Handhebel für Hebeoperationen des Gabelstaplers) in Aktion ist oder nicht, und der Messung, ob die Drehzahl des die zweite Verstellpumpe 2 zum Betrieb antreibenden Motors den zuvor festgelegten Wert für die Betätigung des Handhebels für Hebeoperationen erreicht, dient. Es erfolgt bei Erreichen des zuvor festgelegten Wertes für die Drehzahl des die zweite Verstellpumpe 2 zum Betrieb antreibenden Motors durch die Verarbeitungsvorrichtung 3 die Steuerung dahingehend, dass die zweite Verstellpumpe 2 elektrischen Strom zur Verstellung (Erhöhung) des Fördervolumens erhält, um gemeinsam mit der ersten Verstellpumpe 1 die Versorgung des Betriebsventils 6 mit Öl wahrzunehmen. Somit wird der hohe Flussmengenbedarf des Betriebsventils 6 gedeckt.Method for reducing the operating energy consumption for forklifts according to the present invention: At least one first is provided Variable displacement pump 1 and at least one second variable displacement pump 2, wherein during the operation of the steering device 7 and / or the operating valve 6 of the forklift truck, the first variable displacement pump 1 is responsible for supplying the steering device 7 and / or the operating valve 6 of the forklift truck with oil, while at high flow rates the Operating valve 6 of the forklift, the second variable pump 2 and the first variable pump 1 together perceive the supply of the operating valve 6 with oil. In particular, it is provided that during the simultaneous operation of the steering device 7 and the operating valve 6 of the forklift, the above-mentioned first variable pump 1 primarily supplies the steering device 7 of the forklift with oil and then supplies the operating valve 6 of the forklift with oil. This is made possible by using the above-mentioned priority valve 5, and also using the above-mentioned shuttle valve 4 to understand the relationship between the load feedback signal receiving port of the first variable displacement pump and the load feedback signal output port of the steering device 7 and the load feedback signal output port of the operation valve 6 to coordinate. This prevents the steering device 7 and the operating valve 6 from activating the first variable pump 1 at the same time. The method for reducing the operating power consumption for forklifts according to the present invention further comprises: providing the above-mentioned control unit, the control unit in question comprising a measuring device (not shown in the figure) and a processing device 3, the measuring device measuring whether the at the forklift for driving the above-mentioned operation valve 6 for operation with a large flow amount (for example, the hand lever for lifting operations of the forklift) is in action or not, and is used to measure whether the speed of the motor driving the second variable pump 2 for operation reaches the predetermined value for operating the hand lever for lifting operations. When the predetermined value for the speed of the motor driving the second variable pump 2 for operation is reached by the processing device 3, the control takes place such that the second variable pump 2 receives electrical current for adjusting (increasing) the delivery volume in order to work with the first variable pump 1 perceive the supply of the operating valve 6 with oil. The high flow quantity requirement of the operating valve 6 is thus covered.

Der Betriebsablauf des hydraulischen energiesparenden Steuerungssystems für Gabelstapler nach der vorliegenden Erfindung ist wie folgt:
Während der meisten Operationen im Betriebsverlauf des Gabelstaplers (außer Hebeoperationen) erhält die zweite Verstellpumpe 2 keinen elektrischen Strom und daher befindet sich die zweite Verstellpumpe 2 im Wartemodus mit einer Kapazität von annähernd 0. Wenn der Lastrückkopplungssignal-Empfangsanschluss der ersten Verstellpumpe 1 das von der Lenkvorrichtung 7 und/oder dem Betriebsventil 6 rückgekoppelte Lastrückkopplungssignal (bei diesem Signal handelt es sich um eine geringe Menge von Hydrauliköl) empfängt, tritt die Schrägscheibe der ersten Verstellpumpe 1 in Aktion (schwenkt aus)und gibt Hydrauliköl an die Lenkvorrichtung 7 oder das Betriebsventil 6 aus. Wenn für die Lenkvorrichtung 7 und das Betriebsventil 6 gleichzeitig Flussmengenbedarf besteht, wird - unter der Steuerung durch das Vorrangventil 5 - das durch die erste Verstellpumpe 1 ausgegebene Hydrauliköl mit Vorrang an die Lenkvorrichtung 7 und erst danach an das Betriebsventil 6 bereitgestellt.The operation of the hydraulic energy saving control system for forklifts according to the present invention is as follows:
During most operations in the operation of the forklift (except lifting operations), the second variable pump 2 receives no electric power and therefore the second variable pump 2 is in the standby mode with a capacity of approximately 0. When the load feedback signal receiving port of the first variable pump 1 is from the steering device 7 and / or the operating valve 6 receives a load feedback signal (this signal is a small amount of hydraulic oil), the swash plate of the first variable pump 1 comes into action (swings out) and outputs hydraulic oil to the steering device 7 or the operating valve 6 , If there is a simultaneous flow quantity requirement for the steering device 7 and the operating valve 6, the hydraulic oil output by the first variable pump 1 is given priority to the steering device 7 and only then to the operating valve 6, under the control of the priority valve 5.

Die Messvorrichtung der Steuerungseinheit misst, ob der Handhebel für die Hebeoperation des Gabelstaplers betätigt wird oder nicht. Wenn der Handhebel für die Hebeoperation des Gabelstaplers betätigt wird, wird der Gabelstapler die Hebeoperation vornehmen und für das Betriebsventil 6 besteht nunmehr ein hoher Flussmengenbedarf. Die Messvorrichtung der Steuerungseinheit überträgt das gemessene Signal an die Verarbeitungsvorrichtung 3 und misst die Drehzahl des Motors 8. Wenn die gemessene Drehzahl des Motors 8 den zuvor festgelegten Wert (beispielsweise 1400 Umdrehungen/Minute) erreicht, überträgt die Messvorrichtung das betreffende Signal an die Verarbeitungsvorrichtung 3 und die Verarbeitungsvorrichtung 3 steuert entsprechend, dass die zweite Verstellpumpe 2 elektrischen Strom erhält. Der Ausstoß der zweiten Verstellpumpe 2 nimmt im linearen Verhältnis zu und es erfolgt gemeinsam mit der ersten Verstellpumpe 1 die Versorgung des Betriebsventils 6 mit Öl, so dass der hohe Flussmengenbedarf des Betriebsventils 6 gedeckt wird.The measuring device of the control unit measures whether or not the hand lever is operated for the lifting operation of the forklift. If the hand lever is actuated for the lifting operation of the forklift, the forklift will carry out the lifting operation and the operating valve 6 now requires a high flow rate. The measuring device of the control unit transmits the measured signal to the processing device 3 and measures the speed of the motor 8. When the measured speed of the motor 8 reaches the predetermined value (for example 1400 revolutions / minute), the measuring device transmits the relevant signal to the processing device 3 and the processing device 3 controls accordingly that the second variable pump 2 receives electric current. The output of the second variable pump 2 increases in a linear relationship and, together with the first variable pump 1, the operating valve 6 is supplied with oil, so that the high flow quantity requirement of the operating valve 6 is covered.

Wenn der Handhebel für die Hebeoperation zurückgesetzt wird, beendet die zweite Verstellpumpe 2 die Versorgung des Betriebsventils 6 mit Öl, so dass das Betriebsventil 6 bei Flussmengenbedarf bei anderen Operationen des Gabelstaplers nur durch die erste Verstellpumpe 1 mit Öl versorgt wird. Somit ermöglicht die vorliegende Erfindung gemäß dem Flussmengenbedarf der Lenkvorrichtung 7 und des Betriebsventils 6 des Gabelstaplers die angemessene Versorgung mit Öl, vermeidet das Entstehen von Kapazitätsverschwendung und spart Energieressourcen. Auf diese Weise wird der Leistungsverbrauch des Motors enorm gesenkt und es wird vermieden, dass sich der Motor über lange Zeit im Zustand hoher Leistung befindet, was die Lebensdauer des Motors verlängert. Bei hohem Flussmengenbedarf des Betriebsventils 6 (beispielsweise bei Hebeoperationen des Gabelstaplers) nehmen die erste Verstellpumpe 1 und die zweite Verstellpumpe 2 gemeinsam die Versorgung des Betriebsventils 6 mit Öl wahr und decken den hohen Flussmengenbedarf des Betriebsventils 6, was die Durchführung der Hebeoperationen des Gabelstaplers beschleunigt und somit die Betriebseffizienz des Gabelstaplers erhöht.When the hand lever for the lifting operation is reset, the second variable pump 2 stops supplying the operating valve 6 with oil, so that the operating valve 6 is only supplied with oil by the first variable pump 1 when there is a flow requirement for other operations of the forklift truck. Thus, the present invention enables the adequate supply of oil according to the flow quantity requirement of the steering device 7 and the operation valve 6 of the forklift, avoids the generation of wasted capacity, and saves energy resources. In this way, the power consumption of the engine is reduced enormously and the engine is prevented from being in a high power state for a long time, which extends the life of the engine. When the flow rate of the operating valve 6 is high (for example in lifting operations of the forklift), the first variable pump 1 and the second variable pump 2 collectively supply the operating valve 6 with oil and cover the high flow requirements of the operating valve 6, which accelerates the lifting operations of the forklift and thus increases the operating efficiency of the forklift.

Praktisches Ausführungsbeispiel 2Practical embodiment 2

Der Unterschied zu dem ersten praktischen Ausführungsbeispiel besteht darin, dass es sich bei der vorstehend bezeichneten Steuerungseinheit um eine mechanische Operationssteuerungsvorrichtung handelt, welche steuert, ob die Steuerungsvorrichtung der vorstehend bezeichneten zweiten Verstellpumpe elektrischen Strom erhält oder nicht, beispielsweise um einen Steuerungsschalter.The difference from the first practical exemplary embodiment is that the above-mentioned control unit is a mechanical operation control device which controls whether the control device of the above-mentioned second variable displacement pump receives electrical current or not, for example a control switch.

Wenn der Fahrer des Gabelstaplers den Handhebel für die Hebeoperation betätigt, ist nur bei einer Erhöhung der Drehzahl des Motors auf den zuvor festgelegten Wert (diesen kann der Fahrer nach Erfahrung beurteilen) die Betätigung des Steuerungsschalters erforderlich, um die Steuerungsvorrichtung der zweiten Verstellpumpe 2 Strom erhalten zu lassen. Somit kann die zweite Verstellpumpe gemeinsam mit der ersten Verstellpumpe die Versorgung des Betriebsventils mit Öl wahrnehmen und den hohen Flussmengenbedarf des Betriebsventils decken.When the forklift driver actuates the hand lever for the lifting operation, only when the engine speed increases to the predetermined value (which the driver can judge from experience), the actuation of the control switch is required in order to receive power for the control device of the second variable displacement pump 2 allow. Thus, the second variable pump, together with the first variable pump, can perceive the supply of the operating valve with oil and cover the high flow volume requirement of the operating valve.

Bei den beschriebenen praktischen Ausführungsbeispielen handelt es sich lediglich um Erläuterungen des erfindungsgemäßen hydraulischen energiesparenden Steuerungssystems für Gabelstapler, ohne irgendeine Beschränkung der vorliegenden Erfindung auf diese praktischen Ausführungsbeispiel zu bedeuten.The practical exemplary embodiments described are merely explanations of the hydraulic energy-saving control system for forklift trucks according to the invention, without implying any restriction of the present invention to this practical exemplary embodiment.

Claims (10)

  1. Hydraulic energy-saving control system for a forklift truck, said control system comprising a steering device (7) and a service valve (6) for forklift trucks, wherein the steering device (7) and the service valve (6) each have a load feedback signal output port, wherein the system also comprises:
    at least one first variable displacement pump (1), configured as a load-sensing variable displacement pump, which serves to supply the steering device (7) and/or the service valve (6) with oil, wherein the first variable displacement pump (1) has a load feedback signal reception port, wherein the load feedback signal reception port is connected to the load feedback signal output port of the steering device (7) and to the load feedback signal output port of the service valve (6), wherein the oil output opening of the first variable displacement pump (1) is connected to the oil input opening of the steering device (7) and to the oil input opening of the service valve (6);
    characterized in that the system also comprises:
    at least one second variable displacement pump (2), configured as a variable displacement pump with an electrically variable delivery volume, which serves to execute the supply of the service valve (6) with oil together with the first variable displacement pump (1) only in the event of a high flow rate demand of the service valve (6), wherein the oil output opening of the second variable displacement pump (2) is connected to the oil input opening of the service valve (6);
    a control unit, which is connected to the second variable displacement pump (2) and serves to control whether or not the second variable displacement pump (2) outputs oil.
  2. Hydraulic energy-saving control system for a forklift truck according to Claim 1, characterized in that the control system comprises a shuttle valve (4), wherein a first input opening of the shuttle valve is connected to the load feedback signal output port of the steering device (7), a second input opening of the shuttle valve is connected to the load feedback signal output port of the service valve (6), wherein the output opening of the shuttle valve is connected to the load feedback signal reception port of the first variable displacement pump (1).
  3. Hydraulic energy-saving control system for a forklift truck according to Claim 1 or 2, characterized in that, for the oil output opening of the first variable displacement pump (1), a connecting line to a control valve is used for the connection to the oil input opening of the steering device (7) and to the oil input opening of the service valve (6), wherein, during the simultaneous operation of the steering device (7) and of the service valve (6), the control valve ensures that the first variable displacement pump (1) prioritizes the supply of oil to the steering device (7).
  4. Hydraulic energy-saving control system for a forklift truck according to Claim 3, characterized in that the control valve is a priority valve (5), wherein the oil input opening of the priority valve (5) is connected to the oil output opening of the first variable displacement pump (1), wherein one of the oil output openings of the priority valve (5) is connected to the oil input opening of the steering device (7), while the other oil output opening is connected to the oil input opening of the service valve (6), wherein a control pressure space of the priority valve (5) is connected to the load feedback signal output port of the steering device (7) .
  5. Hydraulic energy-saving control system for a forklift truck according to one of Claims 1 to 4, characterized in that the control unit comprises a measuring device and a processing device (3), wherein the measuring device serves to measure whether the operation control device provided in the forklift truck in order to drive the service valve (6) for operation with a high flow rate is in action or not, and to measure whether the rotational speed of the motor (8) driving the second variable displacement pump (2) for operation has reached the predefined value, wherein the signal output port of the measuring device is connected to the input of the processing device (3) while the output of the processing device (3) is connected to the control device of the second variable displacement pump (2).
  6. Hydraulic energy-saving control system for a forklift truck according to one of Claims 1 to 5, characterized in that the control unit (3) is a mechanical operation control device that controls whether the control device of the second variable displacement pump (2) is receiving power or not.
  7. Hydraulic energy-saving control system for a forklift truck according to one of Claims 1 to 6, characterized in that a one-way valve is provided in the connecting path between the oil output opening of the second variable displacement pump (2) and the oil input opening of the service valve (6), said one-way valve allowing the hydraulic oil to flow from the second variable displacement pump (2) to the service valve (6).
  8. Hydraulic energy-saving control system for a forklift truck according to one of Claims 1 to 7, characterized in that the first variable displacement pump (1) and the second variable displacement pump (2) are driven by the same motor (8) .
  9. Method for reducing the operating energy consumption for a forklift truck that has a hydraulic control system according to one of Claims 1 to 8, characterized in that, during operation of the steering device (7) and/or of the service valve (6) of the forklift truck, the first variable displacement pump (1) supplies the steering device (7) and/or the service valve (6) of the forklift truck with oil, and wherein the second variable displacement pump (2) and the first variable displacement pump (1) jointly supply the service valve (6) with oil only when there is a high flow rate demand of the service valve (6) of the forklift truck.
  10. Method for reducing the operating energy consumption for a forklift truck according to Claim 9, characterized in that, when the steering device (7) and the service valve (6) of the forklift truck are being operated simultaneously, the first variable displacement pump (1) prioritizes the supply of oil to the steering device (7) of the forklift truck and then the supply of oil to the service valve (6) of the forklift truck.
EP16177465.8A 2015-08-07 2016-07-01 Hydraulic energy saving control system for forklift and method for lowering the operating energy consumption for forklift trucks Active EP3127856B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510481173.4A CN105271070B (en) 2015-08-07 2015-08-07 A kind of truck hydraulic energy-saving control system and the method for reducing fork truck operating power consumption
CN201520591654.6U CN204848151U (en) 2015-08-07 2015-08-07 Fork truck hydraulic pressure energy -saving control system

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EP3127856A1 EP3127856A1 (en) 2017-02-08
EP3127856B1 true EP3127856B1 (en) 2020-01-01

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CN108466932B (en) * 2018-05-23 2023-10-13 天津捷强动力装备股份有限公司 Hydraulic speed regulating system for chassis power taking and driving vehicle

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DE10012389B4 (en) * 2000-03-14 2005-03-17 O & K Orenstein & Koppel Ag working machine
DE102012103732A1 (en) * 2012-04-27 2013-10-31 Linde Material Handling Gmbh Hydraulic system of a mobile working machine
DE102012103733A1 (en) * 2012-04-27 2013-10-31 Linde Material Handling Gmbh Load-sensing regulated hydrostatic drive system for industrial trucks, has pump adjustable in its displacement volume, and supply pressure signal line, which stays in connection with supply side of pump in area of pump by throttle device

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