EP3127856B1 - Systeme de commande hydraulique a economie d'energie pour chariot de manutention et procede de reduction de la consommation d'energie pour chariot de manutention - Google Patents

Systeme de commande hydraulique a economie d'energie pour chariot de manutention et procede de reduction de la consommation d'energie pour chariot de manutention 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
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EP16177465.8A
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German (de)
English (en)
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EP3127856A1 (fr
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/zh
Priority claimed from CN201520591654.6U external-priority patent/CN204848151U/zh
Application filed by Linde Material Handling GmbH filed Critical Linde Material Handling GmbH
Publication of EP3127856A1 publication Critical patent/EP3127856A1/fr
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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)

Claims (10)

  1. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche, qui comprend un dispositif de direction (7) et une soupape de commande (6) destinés aux chariots élévateurs à fourche, le dispositif de direction (7) et la soupape de commande (6) comportant chacun une borne de sortie de signal de rétroaction de charge, le système comprenant en outre :
    au moins une première pompe à cylindrée variable (1) qui est réalisée sous la forme d'une pompe à cylindrée variable à détection de charge et qui sert à alimenter le dispositif de direction (7) et/ou la soupape de commande (6) en huile, la première pompe à cylindrée variable (1) comportant une borne de réception de signal de rétroaction de charge, la borne de réception de signal de rétroaction de charge étant reliée à la borne de sortie de signal de rétroaction de charge du dispositif de direction (7) et à la borne de sortie de signal de rétroaction de charge de la soupape de commande (6), l'orifice de sortie d'huile de la première pompe à cylindrée variable (1) étant reliée à l'orifice d'entrée d'huile du dispositif de direction (7) et à l'orifice d'entrée d'huile de la soupape de commande (6) ;
    caractérisé en ce que le système comprend en outre :
    au moins une deuxième pompe à cylindrée variable (2) qui est réalisée sous la forme d'une pompe à cylindrée variable dont le volume de transport est variable et qui sert à assurer l'alimentation de la soupape de commande (6) en huile uniquement en cas d'exigences de débit élevé de la soupape de commande (6) conjointement avec la première pompe à cylindrée variable (1), l'orifice de sortie d'huile de la deuxième pompe à cylindrée variable (2) étant raccordé à l'orifice d'entrée d'huile de la soupape de commande (6) ;
    une unité de commande qui est reliée à la deuxième pompe à cylindrée variable (2) et qui sert à la commande pour savoir si la deuxième pompe à cylindrée variable (2) délivre de l'huile ou non.
  2. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche selon la revendication 1, caractérisé en ce que le système de commande comprend une soupape à deux voies (4), un premier orifice d'entrée de la soupape à deux voies étant raccordé à la borne de sortie de signal de rétroaction de charge du dispositif de direction (7), un deuxième orifice d'entrée de la soupape à deux voies étant raccordé à la borne de sortie de signal de rétroaction de charge de la soupape de commande (6), l'orifice de sortie de la soupape à deux voies étant raccordé à la borne de réception de signal de rétroaction de charge de la première pompe à cylindrée variable (1).
  3. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche selon la revendication 1 ou 2, caractérisé en ce que, pour l'orifice de sortie d'huile de la première pompe à cylindrée variable (1), une conduite de raccordement à une soupape de commande est utilisée pour le raccordement à l'orifice d'entrée d'huile du dispositif de direction (7) et à l'orifice d'entrée d'huile de la soupape de commande (6), la soupape de commande veillant, au cours du fonctionnement simultané du dispositif de direction (7) et de la soupape de commande (6), à ce que la première pompe à cylindrée variable (1) alimente en huile en priorité le dispositif de direction (7).
  4. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche selon la revendication 3, caractérisé en ce que la soupape de commande est une soupape de priorité (5), l'orifice d'entrée d'huile de la soupape de priorité (5) étant raccordé à l'orifice de sortie d'huile de la première pompe à cylindrée variable (1), l'un des orifices de sortie d'huile de la soupape de priorité (5) étant raccordé à l'orifice d'entrée d'huile du dispositif de direction (7) tandis que l'autre orifice de sortie d'huile est raccordé à l'orifice d'entrée d'huile de la soupape de commande (6), une chambre de pression de commande de la soupape de priorité (5) étant raccordé à la borne de sortie de signal de rétroaction de charge du dispositif de direction (7).
  5. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche selon l'une des revendications 1 à 4, caractérisé en ce que l'unité de commande comprend un dispositif de mesure et un dispositif de traitement (3), le dispositif de mesure servant à mesurer si le dispositif de commande d'opération prévu pour entraîner la soupape de commande (6) et pour fonctionner avec un grand de débit dans le chariot élévateur à fourche en action ou non et à mesurer si la vitesse de rotation du moteur (8) entraînant la deuxième pompe à cylindrée variable (2) pour le fonctionnement atteint la valeur prédéterminée, la borne de sortie de signal du dispositif de mesure étant reliée à l'entrée du dispositif de traitement (3) tandis que la sortie du dispositif de traitement (3) est reliée au dispositif de commande de la deuxième pompe à cylindrée variable (2).
  6. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche selon l'une des revendications 1 à 5, caractérisé en ce que l'unité de commande (3) est un dispositif de commande d'opération mécanique qui commande si le dispositif de commande de la deuxième pompe à cylindrée variable (2) est alimenté ou non.
  7. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche selon l'une des revendications 1 à 6, caractérisé en ce que, dans le chemin de liaison entre l'orifice de sortie d'huile de la deuxième pompe à cylindrée variable (2) et l'orifice d'entrée d'huile de la soupape de commande (6), est prévue une soupape à une voie permettant à l'huile hydraulique de s'écouler de la deuxième pompe à cylindrée variable (2) vers la soupape de commande (6).
  8. Système hydraulique, économe en énergie, de commande de chariots élévateurs à fourche selon l'une des revendications 1 à 7, caractérisé en ce que l'entraînement de la première pompe à cylindrée variable (1) et de la deuxième pompe à cylindrée variable (2) est assuré par le même moteur (8).
  9. Procédé de réduction de la consommation d'énergie de fonctionnement de chariots élévateurs à fourche, comprenant un système hydraulique de commande selon l'une des revendications 1 à 8, caractérisé en ce que, lors du fonctionnement du dispositif de direction (7) et/ou de la soupape de commande (6) du chariot élévateur à fourche, la première pompe à cylindrée variable (1) alimente en huile le dispositif de direction (7) et/ou la soupape commande (6) du chariot élévateur à fourche, et en ce que la deuxième pompe à cylindrée variable (2) et la première pompe à cylindrée variable (1) effectuent conjointement l'alimentation en huile de la soupape de commande (6) uniquement pendant le besoin de débit élevé de la soupape de commande (6) du chariot élévateur à fourche.
  10. Procédé de réduction de la consommation d'énergie de fonctionnement d'un chariot élévateur à fourche selon la revendication 9, caractérisé en ce que, pendant le fonctionnement simultané du dispositif de direction (7) et de la soupape de commande (6) du chariot élévateur à fourche, la première pompe à cylindrée variable (1) alimente en huile en priorité le dispositif de direction (7) du chariot élévateur à fourche puis alimente en huile la soupape de commande (6) du chariot élévateur à fourche.
EP16177465.8A 2015-08-07 2016-07-01 Systeme de commande hydraulique a economie d'energie pour chariot de manutention et procede de reduction de la consommation d'energie pour chariot de manutention Active EP3127856B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510481173.4A CN105271070B (zh) 2015-08-07 2015-08-07 一种叉车液压节能控制系统及降低叉车工作能耗的方法
CN201520591654.6U CN204848151U (zh) 2015-08-07 2015-08-07 一种叉车液压节能控制系统

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

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CN108466932B (zh) * 2018-05-23 2023-10-13 天津捷强动力装备股份有限公司 底盘取力行车液压调速系统

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DE10012389B4 (de) * 2000-03-14 2005-03-17 O & K Orenstein & Koppel Ag Arbeitsmaschine
DE102012103733A1 (de) * 2012-04-27 2013-10-31 Linde Material Handling Gmbh Load-Sensing geregeltes hydrostatisches Antriebssystem
DE102012103732A1 (de) * 2012-04-27 2013-10-31 Linde Material Handling Gmbh Hydraulikanlage einer mobilen Arbeitsmaschine

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