EP3252003B1 - Système d'entraînement hydraulique d'un chariot de manutention - Google Patents

Système d'entraînement hydraulique d'un chariot de manutention Download PDF

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Publication number
EP3252003B1
EP3252003B1 EP17174237.2A EP17174237A EP3252003B1 EP 3252003 B1 EP3252003 B1 EP 3252003B1 EP 17174237 A EP17174237 A EP 17174237A EP 3252003 B1 EP3252003 B1 EP 3252003B1
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EP
European Patent Office
Prior art keywords
pressure
drive system
load
electronic control
control device
Prior art date
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Active
Application number
EP17174237.2A
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German (de)
English (en)
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EP3252003A1 (fr
Inventor
Alexander Wünsch
Sebastian Surrey
Sebastian Schauer
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STILL GmbH
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STILL GmbH
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Publication of EP3252003A1 publication Critical patent/EP3252003A1/fr
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    • 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
    • B66F9/24—Electrical 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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
    • 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

Definitions

  • the invention relates to a hydraulic drive system of an industrial truck, wherein the drive system has a working hydraulics comprising as consumer a lifting drive for raising and lowering a load carriage and at least one auxiliary drive, which is designed as an attachment, which is mounted on the load carriage, wherein for controlling each A control path valve is provided in each case the input side to a delivery line of a pump and the output side connected to a container to a container tank line is connected, wherein a flow control device is provided, which is controlled by the upcoming in a load pressure signaling line of the drive system highest load pressure of the consumer, said Load pressure of each consumer can be detected by means of a load pressure alarm branch line and the load pressure alarm branch lines of the consumer are connected to the load pressure signaling line.
  • a working hydraulics comprising as consumer a lifting drive for raising and lowering a load carriage and at least one auxiliary drive, which is designed as an attachment, which is mounted on the load carriage, wherein for controlling each A control path valve is provided in each case the input side to a
  • the DE 198 04 398 A1 discloses a hydraulic drive system of a truck, wherein the drive system has a working hydraulics, which includes a consumer as a lifting drive and at least one auxiliary drive, which may be designed as a side slide.
  • a control path valve is provided in each case, which is connected on the input side to a delivery line of a pump and on the output side to a container line guided to a container. It is provided as a tellstikwage or circulation pressure compensator designed flow control device, which is controlled by the upcoming in a load pressure signaling line of the drive system highest load pressure of the consumer.
  • the load pressure of each consumer can be detected by means of a load pressure alarm branch line.
  • the load pressure alarm branch lines of the consumers are connected to the load pressure signaling line.
  • the DE 10 2007 034 746 A1 discloses a hydraulic drive system of an industrial truck, wherein the drive system has a working hydraulics, which includes a consumer as a lifting drive, a tilt drive and at least one auxiliary drive.
  • a working hydraulics which includes a consumer as a lifting drive, a tilt drive and at least one auxiliary drive.
  • To control each consumer is one each Provided control valve, the input side to a delivery line of a pump and the output side is connected to a guided to a container tank line.
  • the pump is designed as a load-sensing pump adjustable in the delivery volume and has a demand flow regulator as a flow control device, which is controlled by the highest load pressure of the consumer present in a load pressure signaling line of the drive system.
  • the load pressure of each consumer can be detected by means of a load pressure signaling branch line and the load pressure signaling branch lines of the consumers are connected to the load pressure signaling line.
  • the DE 10 2008 052 079 A1 discloses a hydraulic drive system of an industrial truck, wherein the drive system has a working hydraulics, which includes a consumer as a lifting drive, a tilt drive and at least one auxiliary drive, which can be designed as a side slide.
  • a control path valve is provided in each case, which is connected on the input side to a delivery line of a pump and on the output side to a container line guided to a container. It is provided as a Taitulwage or circulation pressure compensator designed flow control device, which is controlled by the upcoming in a load pressure signaling line of the drive system highest load pressure of the consumer.
  • the load pressure of each consumer can be detected by means of a load pressure signaling branch line and the load pressure signaling branch lines of the consumers are connected to the load pressure signaling line.
  • An attachment is in this case attached to a liftable in a mast and lowered load carriage and allows special functions when handling a load.
  • An attachment formed by a corresponding auxiliary drive can be configured for example as a side slide for lateral displacement of a fork or Zinkenverstell réelle for adjusting the distance between forks of a fork or as a rotating device for rotating a lifting device or as a stapler for clamping and holding a male load.
  • the necessary stapling pressure for stapling the load depends on the nature and sensitivity of the load.
  • auxiliary drive In order not to damage the load to be absorbed by a too high clamping pressure, the necessary clamping pressure and thus the working pressure at the auxiliary drive designed as a chamber device must be limited.
  • a manually and thus mechanically adjustable by the operator in the opening pressure relief valve and a pressure gauge on the driver's workplace of the truck to the limiting pressure and thus the working pressure on the auxiliary drive by manually adjusting the pressure relief valve and Manual setting of the limit pressure on the pressure gauge.
  • the pressure gauge and the manually adjustable in the opening pressure relief valve is this accessible to the operator and grow in the field of view of the operator in the driver's workplace.
  • the present invention has for its object to provide a hydraulic drive system of an industrial truck of the type mentioned, in which the working pressure of the auxiliary drive with low construction costs, and without adverse effects on the driver's workplace can be limited.
  • the electronically adjustable by the electronic control device in the opening pressure pressure relief valve can be installed outside the driver's workplace in the truck, so that by installing the electronic in Setting pressure adjustable pressure relief valve no additional visual obstruction of the operator, no elimination of storage options in the driver's workplace and in the equipment of the truck with a heater and / or air conditioning for the driver's workstation no installation problems occur.
  • the load pressure signaling line is connected to a mechanically adjustable in the opening pressure relief valve.
  • mechanically adjustable pressure in the opening pressure relief valve which is provided in addition to the electronically adjustable pressure setting valve for limiting the working pressure of the auxiliary drive, can easily safety against bursting of components and a limitation of working pressure at all consumers.
  • the electronically adjustable pressure limiting valve for setting the opening pressure on an adjustable current with an electric adjustment.
  • an adjustment such as a coil or a magnet
  • with the bias of a acting in the closing direction of the pressure relief valve spring can be easily formed an electronically adjustable in the opening pressure relief valve whose opening pressure is adjustable by means of an electronic control device.
  • the electronic control device is operatively connected to an input device to which a working pressure of the attachment can be entered. This allows a simple and comfortable way that an operator can enter a certain working pressure of the auxiliary drive on the input device.
  • the electronic control device is designed according to an advantageous embodiment of the invention such that after entering a working pressure of the attachment based on a stored in the electronic control device characteristic of the electronically adjustable pressure relief valve, an electrical Power for controlling the adjustment is determined.
  • an electrical Power for controlling the adjustment is determined.
  • the electronic control device is designed such that after entering a working pressure of the attachment additionally observes a loss pressure in the guided from the control way valve to the additional consumer load supply in the determination of the electric current for driving the adjuster becomes.
  • the electronically adjustable in the set pressure relief valve is thus set to a ⁇ réellesduck, which corresponds to the sum of the input working pressure and the additional loss pressure in the consumer supply line.
  • the control valves where the load pressure of the consumer is tapped, are installed in the vehicle body and the auxiliary drive is arranged on the lift mast liftable and lowerable load carriage, resulting in the auxiliary drive correspondingly long load supply lines in which corresponding pressure losses can occur.
  • Corresponding loss pressures can be stored in the electronic control device or entered.
  • the electronic control device is in operative connection with a sensor device detecting the temperature of the pressure medium of the drive system, and the electronic control device is designed such that the additional pressure loss is determined as a function of temperature.
  • the additional loss pressure is determined depending on the viscosity of the pressure medium, so that the temperature and thus the viscosity of the pressure medium is taken into account when setting the opening pressure of the electronically adjustable pressure setting valve in the setting pressure for limiting the working pressure of the auxiliary drive.
  • the opening pressure of the electronically adjustable pressure relief valve is regulated by the electronic control device as a function of the temperature of the pressure medium of the drive system.
  • the opening pressure of the electronically adjustable pressure limiting valve can be controlled in a simple manner depending on the temperature of the pressure medium of the drive system.
  • the electronic control device is in operative connection with a sensor device which detects the pressure in the consumer supply line leading from the control-way valve to the additional consumer.
  • a sensor device With such a sensor device can be measured and detected in a simple manner, the actual occurring in the consumer supply working pressure of the auxiliary drive.
  • the electronic control device can according to an advantageous development of the measured from the sensor device pressure perform an error monitoring of the electronically adjustable pressure relief valve.
  • error monitoring of the electronically adjustable pressure relief valve can be carried out in a simple manner.
  • the electronic control device is in operative connection with a display device, wherein the measured by means of the sensor device pressure is displayed in the display device.
  • the electronic control device is designed according to an advantageous embodiment of the invention such that the opening pressure of the electronically adjustable pressure relief valve is controlled such that it is avoided that the measured pressure from the sensor device to the input device exceeds the entered working pressure.
  • the electronic control device thus regulates the opening pressure of the electronically adjustable pressure limiting valve such that the actual working pressure of the additional consumer measured in the consumer supply line by means of the sensor device is always smaller than the working pressure entered at the input unit. In this way, an effective limitation of the working pressure of the auxiliary drive can be achieved on the predetermined at the input unit working pressure.
  • the electronic control device with a lifting height of the load carriage or the attachment detecting sensor device is in operative connection and the electronic control device is designed such that the opening pressure of the electronically adjustable pressure relief valve is set in dependence on the lifting height ,
  • the pressure limiting function of the auxiliary drive can be carried out in a manner dependent on the lifting height by means of the electronically adjustable pressure limiting valve.
  • the electronic control device is in operative connection with a sensor device which detects the working range of the industrial truck, and the electronic control device is designed such that the opening pressure of the electronically adjustable Pressure relief valve is set depending on the detected work area.
  • a sensor device which detects the working area of the industrial truck a zone recognition can be formed in a simple manner and the electronically adjustable pressure limiting valve can be adjusted, for example, to a load handled in the detected zone.
  • the sensor device can be designed, for example, as an RFID device.
  • the setting of the electronically adjustable pressure relief valve to a handled in the detected zone load can for example be done independently or displayed in the display message and done by entering a confirmation at the input device.
  • the attachment can be designed according to advantageous embodiments of the invention as a side gate or as Zinkenverstell réelle or as a rotating device or as a stapling device.
  • a side slider is used for lateral displacement of a fork.
  • a Zinkenverstell réelle serves to adjust the distance between forks of a fork.
  • a rotating device serves to rotate a load-receiving means about a horizontal axis.
  • a stapler has side brackets that clamp and thus hold a male load. It is understood, however, that this list is not exhaustive and the invention can be used for all common implements of industrial trucks.
  • the attachment is designed as a stapling device, there are advantages if, in accordance with a further development of the invention, the electronic control device is in operative connection with a sensor device detecting the lifting height of the load carriage or the attachment and a sensor device detecting the pressure in a consumer supply line of the linear actuator and the electronic control device is formed such that when lifting the clamping device by means of the lifting drive, the opening pressure of the electronically adjustable pressure limiting valve is increased, as long as detected by means of the pressure in the load supply of the linear actuator sensing sensor device lifting a stapled with the stapler load. As a result, a minimum clip pressure, which is required for clamping the load, be automatically determined by the electronic control device.
  • the opening pressure of the electronically adjustable pressure limiting valve and thus the clamping pressure of the clamping device is increased until the measured by the sensor means pressure in the load supply line of the lifting drive does not appreciably increase and the lifting corresponds to the load required pressure. If the measured by means of the sensor device pressure in the load supply line of the linear actuator no longer appreciably increases, the clamping pressure of the stapler is sufficient to clamp the load and thus raise. Increasing the opening pressure of the electronically adjustable pressure limiting valve can thus be stopped and the minimum clamping pressure can be determined with which the load can be clamped and lifted.
  • the pump can be configured as adjustable in the flow variable pump and the flow control device can be designed as a control volume of the variable displacement control valve, which depends on the upcoming in the load pressure message line highest load pressure of the consumer in the direction of increasing the delivery volume is charged.
  • the electronically adjustable pressure limiting valve When opening the electronically adjustable pressure limiting valve, a further increase in the delivery volume of the pump and thus a further increase in the delivery pressure of the pump is avoided by means of the control valve, thus achieving a limitation of the working pressure of the auxiliary drive.
  • the flow control device may be formed as a circulation pressure balance, which is acted upon by the pending in the load pressure sensing line load pressure of the consumer in the direction of a blocking position.
  • the load pressure applied to the circulation pressure balance is limited and achieved that the circulation pressure compensator is controlled by the delivery pressure supplied by the pump in an open position in which the delivery line of the pump is connected to a container.
  • the excessively funded by the pump flow thus flows through the open circulation pressure balance to the container, so that a further increase of the delivery pressure of the pump avoided and thus a limitation of the working pressure of the auxiliary drive is achieved.
  • the pump is advantageously designed as a constant displacement pump in the delivery volume.
  • FIGS. 1 to 3 are circuit diagrams of hydraulic drive systems 1 of an industrial truck, such as a forklift, shown.
  • FIGS. 1 to 3 are the same components provided with the same reference numerals.
  • the drive system 1 has a working hydraulics 2, which comprises a plurality of consumers 3, 4, 5, 6.
  • the consumer 3 is designed, for example, as a lifting drive 3a, which comprises at least one hydraulic lifting cylinder, which is in communication with a load carriage, not shown, of the industrial truck for lifting and lowering a load.
  • the load carriage can be raised and lowered in a mast.
  • the consumer 4 is formed, for example, as a tilt drive 4a of a mast.
  • the consumers 5 and 6 are designed as additional drives 5a, 6a.
  • the auxiliary drives 5a, 6a are each designed as an attachment, which is mounted on the load carriage.
  • the auxiliary drives 5a, 6a designed as attachments are, for example, as a side slide and / or as a clamping device educated.
  • the additional drives 5a, 6a may alternatively be formed by other common attachments.
  • the consumers 3, 4, 5 and 6 are in each case controllable by means of a control-way valve 10, 11, 12, 13, for example a directional control valve throttling in intermediate positions, which are combined in a control valve block 14.
  • the consumer 3 is connected by means of a consumer supply line 15 with the control valve 10.
  • the consumer 4 is connected by means of consumer feed lines 16a, 16b to the control valve 11.
  • the consumer 5 is connected by means of consumer feed lines 17a, 17b to the control path valve 12.
  • the consumer 6 is connected by means of consumer feed lines 18a, 18b to the control way valve 12.
  • a pump 20 is provided which is in operative connection with a drive motor, not shown, for example, an internal combustion engine or an electric motor for driving.
  • the pump 20 is designed as a delivery volume constant constant pump.
  • the pump 20 is operated in open circuit, sucks the pressure medium by means of a suction line 21 from a container 22 and conveys into a feed line 23.
  • the delivery line 23 is connected to a connection P of the control valve block 14 and communicates with a delivery conduit 24 of the control valve block 14, to which the control travel valves 10, 11, 12, 13 of the consumer 3, 4, 5, 6 by means of respective branch lines 24a, 24b , 24c, 24d are connected.
  • a container channel 25 is further formed, to which the control valves 10, 11, 12, 13 of the consumer 3, 4, 5, 6 are connected by means of respective branch lines 25a, 25b, 25c, 25d.
  • the container channel 25 leads to a T-connection of the control valve block 14, to which a container line 26 guided to the container 22 is connected.
  • the drive system 1 has a flow control device 30, which is controlled by the pending in a load pressure signaling line 31 of the drive system 1 highest load pressure of the load 3-6.
  • the load pressure of each consumer 3-6 is detectable by means of a load pressure alarm branch line 32-35, the highest Load pressure in the load pressure signaling branch lines 32-35 of the consumers 3-6 is forwarded by means of a load pressure signaling chain 50 into the load pressure signaling line 31.
  • the flow control device 30 is formed in the illustrated embodiment as a circulation pressure compensator 40.
  • the circulation pressure compensator 40 is arranged in a branch line 41 guided from the delivery line 24 to the container channel 25.
  • the circulation pressure balance 40 has a blocking position 40a and a flow position 40b. In the direction of the blocking position 40a, the circulation pressure compensator 40 is acted upon by the highest load pressure of the consumers 3, 4, 5, 6 present in the load pressure signaling line 31. In the direction of the blocking position 40a, the circulation pressure compensator 40 is further acted upon by a spring 42. In the direction of the flow position 40b, the circulation pressure balance 40 is acted upon by the delivery pressure of the pump 20.
  • a control line 43 branching off from the delivery line channel 24 is guided on a control surface of the circulation pressure compensator 40 which acts in the direction of the flow position 40b.
  • the highest load pressure of the load 3-6 leading load pressure signaling line 31 is assigned a mechanically adjustable in the opening pressure relief valve 45, which is the input side connected to the load pressure signaling line 31 and the output side to the container channel 26.
  • control valve block 14 of a first embodiment of the invention is shown in more detail, having the three consumers 3, 4 and 5.
  • control valve block 14 of a second embodiment of the invention is shown in more detail, having the four consumers 3, 4, 5 and 6.
  • the load pressure signaling chain 50 by means of in the FIG. 2 the highest load pressure in the load pressure alarm branch line 32-34 of the three consumers 3-5 is forwarded to the load pressure signaling line 31, comprises a shuttle valve 51, at its first input the load pressure alarm branch line 34 of the consumer 5 and at its second input the load pressure alarm branch line 33 of the consumer 4 is connected ,
  • the output of the shuttle valve 51 is connected by means of a connecting line 52 to the first input of a further shuttle valve 53 connected to the second input, the load pressure signaling line 32 of the consumer 3 is connected.
  • the highest load pressure of the consumer 3, 4, 5 leading load pressure signaling line 31 is connected, which is guided to the acting in the direction of the blocking position 40a control surface of the circulation pressure compensator 40.
  • the load pressure signaling chain 50 by means of in the FIG. 3 the highest load pressure in the load pressure signaling branch line 32-35 of the four consumers 3-6 is forwarded to the load pressure signaling line 31, comprises a shuttle valve 55, at its first input the load pressure alarm branch line 35 of the consumer 6 and at its second input the load pressure alarm branch line 34 of the consumer 5 is connected ,
  • the output of the shuttle valve 55 is connected by means of a connecting line 56 to the first input of the shuttle valve 51, at the second input of the load pressure alarm branch line 33 of the consumer 4 is connected.
  • the output of the shuttle valve 51 is - analogous to the FIG.
  • the load pressure signaling branch line 34 of the auxiliary drive 5a is connected to an electronically adjustable pressure limiting valve 60 in the opening pressure.
  • the connecting line 56 which is connected via the shuttle valve 55 to the load pressure signaling branch lines 34, 35 of the two auxiliary drives 5a, 6a, connected to an electronically adjustable in the opening pressure relief valve 60.
  • the electronically adjustable in the opening pressure relief valve 60 is for driving with an electronic control device 61 in operative connection, the input side is connected to an input device 62 and a display device 63 in operative connection.
  • the electronic control device 61 is the Opening pressure of the pressure limiting valve 60 adjustable.
  • the input device 62 and the display device 63 is preferably combined to form a display and control unit.
  • the input device 62 and the display device 63 are arranged in a driver's workplace of the industrial truck. At the input device 62 can be entered by an operator, a maximum working pressure of the auxiliary drive 5a and 6a.
  • the electronically adjustable in the opening pressure pressure relief valve 60 outside and thus separated from the control valve block 14 is arranged.
  • the pressure limiting valve 60 which can be adjusted electronically in the opening pressure, is connected on the input side by means of a supply line 65, for example a hose line, to a connection X of the control valve block 14, to which in the FIG. 2 the load pressure alarm branch line 34 of the consumer 5 and in the FIG. 3 the connecting line 56 of the load pressure signaling chain 50 is connected.
  • the output of the electronically adjustable in the opening pressure relief valve 60 is connected by means of a drain line 66, such as a hose, with the tank line 26.
  • the pressure limiting valve 60 which can be adjusted electronically in the opening pressure, has an adjusting device 70 that can be controlled by an electric current to set the opening pressure.
  • the adjusting device 70 which comprises, for example, a coil or a magnet, is connected to a spring device not shown in connection, which acts on the pressure limiting valve 60 in the direction of the blocking position. By electrical control of the adjusting device 70, the bias of the spring device can be changed and thus the opening pressure of the pressure limiting valve 60 can be adjusted.
  • the maximum working pressure of the auxiliary drive 5a or 6a can be limited by the pressure limiting valve 60 which can be adjusted electronically in the opening pressure.
  • the pressure relief valve 60 opens at a set opening pressure.
  • the pump 20 delivers the pressure until the opening pressure of the pressure limiting valve 60 full flow to the additional drives 5a and 6a, wherein the delivery pressure of the pump 20 in response to the load pressure of the auxiliary drive 5a and 6a increases. If the load pressure of the auxiliary drive 5a or 6a exceeds the opening pressure of the pressure limiting valve 60, this opens and restricts the load pressure present in the load pressure signaling line 31 to the opening pressure of the pressure limiting valve 60.
  • the circulation pressure compensator 40 moves from the delivery pressure of the pump 20 in the direction of the control line 43 the flow position 40b actuated and the excessively funded by the pump 20 flow rate can flow via the branch line 41 to the container 26 and a further increase in the delivery pressure of the pump 20 and thus of the additional consumers 5a and 6a pending working pressure can be prevented.
  • the electronically adjustable in the set pressure relief valve 60 is thus arranged parallel to the pressure relief valve 45 and works in the function analogous to the pressure relief valve 45.
  • the pressure relief valve 45 acts on all consumers 3-6 of the drive system 1 and serves as security against bursting of the components and the consumer 3-6.
  • the pressure limiting valve 60 With the pressure limiting valve 60, however, only the working pressure of the auxiliary drives 5a, 6b can be limited.
  • the working pressure of the attachment formed as an auxiliary drive 5a and 6a can be detected from the nameplate of the attachment and entered manually on the input device 62.
  • the electronic control device 61 is a characteristic of the electronically adjustable pressure relief valve 60 is stored, that is, the relationship between electric current for driving the adjusting device 70 and opening pressure of the pressure relief valve 60th
  • the electric current corresponding to the predetermined working pressure for controlling the setting device 70 can be determined on the basis of the stored characteristic curve of the pressure limiting valve 60, and the opening pressure of the pressure limiting valve 60 is set to the working pressure of the auxiliary drive 5a or 5 preset by the operator in the input device 62 6a. This allows control of the opening pressure of the pressure relief valve 60 to the predetermined working pressure of the auxiliary drive 5a and 6a.
  • From the electronic control device 61 is based on the stored characteristic of the pressure relief valve 60 of the sum of predetermined working pressure of the auxiliary drive 5a and 6a and additional loss of the consumer supply line 17a, 17b and 18a, 18b belonging electric current for controlling the adjusting device 70 determines and the opening pressure the pressure limiting valve 60 to the sum of predetermined working pressure of the auxiliary drive 5a and 6a and additional loss pressure of the consumer supply line 17a, 17b and 18a, 18b set.
  • the additional loss pressure of the consumer supply line 17a, 17b or 18a, 18b essentially depends on the length of the consumer supply line 17a, 17b or 18a, 18b. Since the control valve block 14 is disposed in the vehicle body of the truck and designed as an attachment auxiliary drive 5a and 6a is arranged on the load carriage and thus raised and lowered in the mast, the additional loss pressure of the consumer supply line 17a, 17b or 18a, 18b vehicle characteristic.
  • the loss pressure of the consumer supply line 17a, 17b or 18a, 18b is also dependent on the viscosity of the pressure medium and the volume flow flowing in the consumer supply line 17a, 17b or 18a, 18b.
  • the additional loss pressure of the consumer supply line 17a, 17b or 18a, 18b can be taken into account as a function of the temperature of the electronic control device 61 and a regulation of the opening pressure of the pressure limiting valve 60, wherein the opening pressure of the sum of the predetermined working pressure and the temperature-dependent loss pressure in the consumer supply line 17a, 17b and 18a, 18b.
  • the electronic control device 61 can furthermore be in operative connection with a sensor device 90 which detects the pressure in the consumer supply line 17a, 17b, 18a, 18b. This makes it possible to detect the actual working pressure of the auxiliary drive 5a or 6a.
  • an error monitoring of the electronically adjustable pressure limiting valve 60 can be performed.
  • the pressure measured by the sensor device 70 and thus the actual working pressure of the auxiliary drive 5a or 6a can be displayed on the display device 63 by the electronic control device 61.
  • the opening pressure of the pressure relief valve 60 can also be controlled such that it is avoided that measured by the sensor device 90 actual working pressure of the auxiliary drive 5a and 6a input to the input device 62 Exceeds working pressure.
  • the electronic control device 61 thus regulates the opening pressure of the pressure limiting valve 60 by means of the sensor device 90 such that the actual working pressure of the auxiliary drive 5a or 6a measured by the sensor device 90 is always smaller than the working pressure of the auxiliary drive 5a or 6a input and predetermined at the input device 62 ,
  • pre-sets can be stored for different opening pressures of the electronically adjustable pressure relief valve 60, which can be retrieved and selected by the operator. These presets may be specific to different attachments and / or to different loads (goods).
  • the electronic control device 61 can furthermore be in operative connection with a sensor device 75 which detects the lifting height of the load carriage or of the attachment.
  • a sensor device 75 which detects the lifting height of the load carriage or of the attachment.
  • This makes it possible to adjust the opening pressure of the electronically adjustable pressure limiting valve 60 as a function of the lifting height and thus to carry out the limitation of the working pressure of the auxiliary drive 5a or 6a designed as an attachment as a function of the lifting height of the attachment.
  • This makes it possible, in an attachment designed as a stapling device, to prevent the stapling of a load that is too heavy at too high a lifting height in order to prevent the forklift from tipping forward.
  • This also makes it possible to limit all movements of attachments depending on the height of the lift, for example to limit the movements of attachments individually at different heights.
  • the electronic control device 61 can furthermore be in operative connection with a sensor device 80 which detects the working area of the industrial truck in order to carry out a so-called zone recognition.
  • a sensor device 80 which detects the working area of the industrial truck in order to carry out a so-called zone recognition.
  • the setting of the opening pressure of the electronically adjustable pressure relief valve 60 can indicated on the display device 63 and carried out after confirmation on the input device 62.
  • the electronic control device 61 can be in operative connection with a sensor device 85 detecting the pressure in the consumer supply line 15 of the lifting drive 3a.
  • a sensor device 85 which detects the pressure in the consumer supply line 15 of the lifting drive 3a
  • a sensor device 75 which detects the lifting height of the load carriage or the attachment
  • a minimal stapling pressure of the clamping device can be produced by the electronic control device 61 in the case of an attachment constructed as a stapling device be determined for stapling and thus lifting a load.
  • the opening pressure of the electronically adjustable pressure relief valve 60 which forms the clamping pressure of the stapler slowly increases until the pressure in the consumer supply line 15 of Lifting actuator 3a no longer appreciably increases and thus by means of the pressure in a load supply line 15 of the lifting drive 13a detecting sensor device 85, a lifting of the stapled with the stapling device load is detected.
  • the opening pressure of the pressure limiting valve 60 then corresponds to the minimum clamping pressure with which the load can be clamped and lifted by the clamping device. Increasing the opening pressure of the electronically adjustable pressure relief valve 60 may then be terminated.
  • the invention in which a restriction of the working pressure of the auxiliary drive 5a and 6a by means of electronic control of the input device 62 electronically adjustable pressure relief valve 60 is achieved, has a number of advantages.
  • the input of the working pressure of the auxiliary drive 5a, 6b can be user-friendly and comfortable input to the input device 62.
  • the electronically adjustable pressure relief valve 60 has a low installation cost and thus a small additional construction costs.
  • the truck is provided with an access and authorization control for the operator, it can also be ensured that sensitive opening pressure settings of the pressure limiting valve 60, for example opening pressures to avoid damage to a load, can not be adjusted by an unauthorized operator.

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Claims (20)

  1. Système d'entraînement hydraulique (1) d'un chariot de manutention, dans lequel le système d'entraînement (1) comporte un système hydraulique de travail (2) qui, en tant que consommateur (3, 5 ; 6), comprend un entraînement de levage (3a) destiné à lever et abaisser un chariot de chargement et au moins un entraînement auxiliaire (5a ; 6a) qui est réalisé sous la forme d'un accessoire, qui est monté sur le chariot de chargement, dans lequel il est respectivement prévu une vanne de direction de commande (10, 12 ; 13) destinée à commander chaque consommateur (3, 5 ; 6), qui est reliée côté entrée à une conduite de refoulement (23) d'une pompe (20) et côté sortie à une conduite de récipient (26) menant à un récipient (22), dans lequel il est prévu un dispositif de régulation de débit de refoulement (30) qui est commandé par la pression de charge la plus élevée des consommateurs (3, 5 ; 6) qui se produit dans une ligne de signalisation de pression de charge (31) du système d'entraînement (1), dans lequel la pression de charge de chaque consommateur (3, 5 ; 6) peut être détectée au moyen d'une dérivation de détection de pression de charge (32, 34 ; 35) et les dérivations de détection de pression de charge (32, 34 ; 35) des consommateurs (3, 5 ; 6) sont reliées à la dérivation de détection de pression de charge (31), caractérisé en ce que la dérivation de signalisation de pression de charge (34 ; 35) de l'entraînement auxiliaire (5a ; 6a) est reliée à une vanne de limitation de pression (60) à pression d'ouverture réglable électroniquement et en ce qu'il est prévu un dispositif de commande électronique (61) au moyen duquel la pression d'ouverture de la vanne de limitation de pression (60) réglable électroniquement peut être réglée.
  2. Système d'entraînement hydraulique selon la revendication 1, caractérisé en ce que la conduite de signalisation de pression de charge (31) est reliée à une vanne de limitation de pression (45) à pression d'ouverture réglable mécaniquement.
  3. Système d'entraînement hydraulique selon la revendication 1 ou 2, caractérisé en ce que la vanne de limitation de pression (60) réglable électroniquement comporte un dispositif de réglage (70) pouvant être commandé par un courant électrique pour régler la pression d'ouverture.
  4. Système d'entraînement hydraulique selon l'une des revendications 1 à 3, caractérisé en ce que le dispositif de commande électronique (61) est en liaison fonctionnelle avec un dispositif de saisie (62) sur lequel il est possible de saisir une pression de travail de l'accessoire.
  5. Système d'entraînement hydraulique selon la revendication 4, caractérisé en ce que le dispositif de commande électronique (61) est conçu de manière à ce qu'après la saisie d'une pression de travail de l'accessoire, un courant électrique soit déterminé pour commander le dispositif de réglage (70) sur la base d'une courbe caractéristique, stockée dans le dispositif de commande électronique (61), de la vanne de limitation de pression (60) réglable électroniquement.
  6. Système d'entraînement hydraulique selon la revendication 4 ou 5, caractérisé en ce que le dispositif de commande électronique (61) est conçu de manière à ce qu'après la saisie d'une pression de travail de l'accessoire, une pression de perte dans une conduite d'alimentation de consommateur (17a, 17b ; 18a, 18b), qui est conduite de la vanne de direction de commande (12 ; 13) au consommateur auxiliaire (5a ; 6a), soit en outre prise en compte lors de la détermination du courant électrique destiné à commander le dispositif de réglage (70) .
  7. Système d'entraînement hydraulique selon la revendication 6, caractérisé en ce que le dispositif de commande électronique (61) est en liaison fonctionnelle avec un dispositif capteur (64) qui détecte la température du fluide sous pression du système d'entraînement (1) et en ce que le dispositif électronique (61) est conçu de manière à ce que la pression de perte additionnelle soit déterminée en fonction de la température.
  8. Système d'entraînement hydraulique selon la revendication 7, caractérisé en ce que la pression d'ouverture de la vanne de limitation de pression (60) réglable électroniquement est régulée par le dispositif de commande électronique (61) en fonction de la température du fluide du système d'entraînement (1).
  9. Système d'entraînement hydraulique selon l'une des revendications 1 à 8, caractérisé en ce que le dispositif de commande électronique (61) est en liaison fonctionnelle avec un dispositif capteur (90) qui détecte la pression dans la conduite d'alimentation de consommateur (17a, 17b ; 18a, 18b) qui est conduite de la vanne de direction de commande (12 ; 13) au consommateur auxiliaire (5a ; 6a).
  10. Système d'entraînement hydraulique selon la revendication 9, caractérisé en ce que le dispositif de commande électronique (61) effectue une surveillance d'erreur de la vanne de limitation de pression (60) réglable électroniquement sur la base de la pression mesurée par le dispositif capteur (90).
  11. Système d'entraînement hydraulique selon la revendication 9 ou 10, caractérisé en ce que le dispositif de commande électronique (61) est en liaison fonctionnelle avec un dispositif d'affichage (63) et en ce que la pression mesurée au moyen du dispositif capteur (90) est affichée sur le dispositif d'affichage (63).
  12. Système d'entraînement hydraulique selon l'une des revendications 4 à 11, caractérisé en ce que le dispositif de commande électronique (61) est conçu de manière à ce que la pression d'ouverture de la vanne de limitation de pression (60) réglable électroniquement soit réglée de manière à empêcher que la pression mesurée par le dispositif capteur (90) dépasse la pression de travail saisie sur le dispositif de saisie (62).
  13. Système d'entraînement hydraulique selon l'une des revendications 1 à 12, caractérisé en ce que plusieurs préréglages pouvant être sélectionnés pour différentes pressions d'ouverture de la vanne de limitation de pression (60) réglable électroniquement sont stockés dans le dispositif de commande électronique (61).
  14. Système d'entraînement hydraulique selon l'une des revendications 1 à 13, caractérisé en ce que le dispositif de commande électronique (61) est en liaison fonctionnelle avec un dispositif capteur (75) qui détecte la hauteur du chariot ou de l'accessoire et en ce que le dispositif électronique (61) est conçu de manière à ce que la pression d'ouverture de la vanne de limitation de pression (60) réglable électroniquement soit réglée en fonction de la hauteur de levage.
  15. Système d'entraînement hydraulique selon l'une des revendications 1 à 14, caractérisé en ce que le dispositif de commande électronique (61) est en liaison fonctionnelle avec un dispositif capteur (80) qui détecte la zone de travail du chariot de manutention et en ce que le dispositif de commande électronique (61) est conçu de manière à ce que la pression d'ouverture de la vanne de limitation de pression (60) réglable électroniquement soit réglée en fonction de la zone de travail détectée.
  16. Système d'entraînement hydraulique selon l'une des revendications 1 à 15, caractérisé en ce que l'accessoire est conçu sous la forme d'un dispositif de déplacement latéral ou de réglage de fourche ou d'un dispositif rotatif ou d'un dispositif de serrage.
  17. Système d'entraînement hydraulique selon la revendication 16, caractérisé dans lequel l'accessoire est réalisé sous la forme d'un dispositif de serrage, caractérisé en ce que le dispositif de commande électronique (61) est en liaison fonctionnelle avec un dispositif capteur (75) qui détecte la hauteur de levage du chariot de chargement ou de l'accessoire et avec un dispositif capteur (85) qui détecte la pression dans une conduite d'alimentation de consommateur (15) de l'entraînement de levage (3a) et en ce que le dispositif de commande électronique (61) est conçu de manière à ce que, lorsque le dispositif de serrage est levé au moyen de l'entraînement de levage (3a), la pression d'ouverture de la vanne de limitation de pression (60) réglable électroniquement soit augmentée jusqu'à ce qu'un levage d'une charge serrée à l'aide du dispositif de serrage soit détectée au moyen du dispositif capteur (85) qui détecte la pression dans la ligne d'alimentation de consommateur (15) de l'entraînement de levage (3a).
  18. Système d'entraînement hydraulique selon l'une des revendications 1 à 17, caractérisé en ce que la pompe (20) est réalisée sous la forme d'une pompe variable à débit de refoulement réglable et en ce que le dispositif de régulation du débit est réalisé sous la forme d'une vanne de réglage du débit de refoulement de la pompe variable, qui est sollicitée par la pression de charge la plus élevée des consommateurs, qui se produit sur la conduite de signalisation de pression de charge (31) dans la direction d'une augmentation du débit de refoulement.
  19. Système d'entraînement hydraulique selon l'une des revendications 1 à 17, caractérisé en ce que le dispositif de régulation du débit de refoulement (30) est réalisé sous la forme d'un compensateur de pression de circulation (40) qui est soumis à la pression de charge la plus élevée des consommateurs (3, 5 ; 6), qui se produit dans la conduite de signalisation de charge (31) dans la direction d'un point de blocage (40a).
  20. Système d'entraînement hydraulique selon la revendication 19, caractérisé en ce que la pompe (20) est réalisée sous la forme d'une pompe constante à débit de refoulement constant.
EP17174237.2A 2016-06-03 2017-06-02 Système d'entraînement hydraulique d'un chariot de manutention Active EP3252003B1 (fr)

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DE102016110310.1A DE102016110310A1 (de) 2016-06-03 2016-06-03 Hydraulisches Antriebssystem eines Flurförderzeugs

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DE102018109789A1 (de) * 2018-04-24 2019-10-24 Putzmeister Engineering Gmbh Verfahren und System zur hydraulischen Steuerung eines Betonverteilermasts

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DE19804398A1 (de) * 1998-02-04 1999-08-05 Linde Ag Ventilanordnung für die Arbeitshydraulik eines Arbeitsfahrzeugs
US6431816B1 (en) * 1998-10-07 2002-08-13 Cascade Corporation Adaptive load-clamping system
DE102007034746B4 (de) * 2007-07-25 2022-11-17 Still Gesellschaft Mit Beschränkter Haftung Hydrostatisches Antriebssystem
DE102008034780A1 (de) * 2008-07-25 2010-01-28 Linde Material Handling Gmbh Hydraulische Steuerung eines Flurförderzeugs
DE102008052079A1 (de) * 2008-10-17 2010-04-22 Linde Material Handling Gmbh Hydrostatisches Antriebssystem einer mobilen Arbeitsmaschine
DE102014105660A1 (de) * 2014-04-22 2015-10-22 Still Gmbh Hydraulisches Antriebssystem eines Flurförderzeugs

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