EP3556722B1 - Chariot de manutention doté d'un dispositif de levage - Google Patents

Chariot de manutention doté d'un dispositif de levage Download PDF

Info

Publication number
EP3556722B1
EP3556722B1 EP19166526.4A EP19166526A EP3556722B1 EP 3556722 B1 EP3556722 B1 EP 3556722B1 EP 19166526 A EP19166526 A EP 19166526A EP 3556722 B1 EP3556722 B1 EP 3556722B1
Authority
EP
European Patent Office
Prior art keywords
control valve
lifting
valve
load
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19166526.4A
Other languages
German (de)
English (en)
Other versions
EP3556722A1 (fr
Inventor
Hans-Ulrich Knechtel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde Material Handling GmbH
Original Assignee
Linde Material Handling GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linde Material Handling GmbH filed Critical Linde Material Handling GmbH
Publication of EP3556722A1 publication Critical patent/EP3556722A1/fr
Application granted granted Critical
Publication of EP3556722B1 publication Critical patent/EP3556722B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • F15B11/0445—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out" with counterbalance valves, e.g. to prevent overrunning or for braking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40592—Assemblies of multiple valves with multiple valves in parallel flow paths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5156—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a return line and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure

Definitions

  • the invention relates to an industrial truck with a lifting device which has a lifting device arranged on a lifting frame that can be raised and lowered, a hydraulic lifting cylinder device being provided for lifting and lowering the load lifting device, which can be actuated by means of a control valve device, the control valve device being connected to a lifting cylinder device Pressure medium line and is connected to a container line leading to a container and wherein the control valve device has a lowering position in which the pressure medium line is connected to the container line, wherein a discharge flow control valve (discharge volume flow control valve) is arranged in the container line, wherein in the container line between the control valve device and the Outflow flow control valve, a switching valve is arranged which, in a first switching position, activates the outflow flow control valve arranged in the container line, so that in the lowering operation eb of the lifting cylinder device, the pressure medium flow flows from the lifting cylinder device to the container via the discharge flow control valve arranged in the container line, and in a second switching position deactivates the discharge
  • a load suspension device which is usually formed by a lifting carriage that can be raised and lowered on the lifting frame and an attachment attached to it.
  • the attachment can be designed, for example, as a load fork consisting of forks, by means of which a load, for example a pallet, can be driven under.
  • the deflection of the control valve device during lowering operation determines the lowering speed of the load handling device.
  • a legally prescribed limit value of 0.6 m / s for a maximum lowering speed of the Load suspension device or a load is prescribed.
  • the control valve device in generic lifting devices is designed in such a way that, when the control valve device is fully actuated in a lowering position, a maximum pressure medium outflow can flow from the lifting cylinder device to a container in all operating conditions.
  • a discharge flow control valve In order to ensure compliance with the legally prescribed limit value for the maximum lowering speed of 0.6 m / s, in the case of industrial trucks of the generic type, in a container line that leads from the control valve device to a container and in which, in the lowering position of the control valve device, pressure medium from the lifting cylinder device to the Flows from the container, a discharge flow control valve is provided.
  • the discharge flow control valve arranged in the container line limits the maximum volume flow in the container line in the lowering mode of the lifting device and thus the lowering speed of the load to the limit value of 0.6 m / s, regardless of the load pressure of a load on the load handling device.
  • the discharge flow control valve is set in such a way that, in lowering mode, it limits the lifting stage of the lifting frame, which lowers the fastest, with its maximum setting tolerance to the limit value of 0.6 m / s.
  • This setting of the discharge flow control valve means that further lifting stages of the lifting frame may lower a load much more slowly under certain circumstances.
  • a load is lowered at a speed between 0.5 m / s and 0.56 m / s.
  • the U.S. 3,512,072 A discloses a generic industrial truck with the features of the preamble of claim 1.
  • a diverter valve is provided in a container line led from a control valve to the container in order to enable energy to be recovered when the load handling device is in the lowering mode.
  • the diverting valve connects the container line with a line leading to the container when the pressure in the container line is below a pressure limit value Return line and at a pressure in the container line above the pressure limit value, the container line for energy recovery of the sink energy with a line leading to a hydraulic motor that drives a generator, in which a discharge flow control valve is arranged.
  • the DE 10 2012 024 647 A1 discloses a battery-powered industrial truck with a useful lowering, with an electrically operated proportional valve in the lower branch of the lifting cylinder device being switched between a generator-controlled load lowering and a valve-controlled load lowering.
  • the proportional valve has a position A for a generator-controlled load lowering, a position C for a valve-controlled load lowering and a spring-centered middle position B as a blocking position.
  • the load lowering controlled by a generator takes place in which the proportional valve is actuated to position A, in which the useful lowering current flowing out of the lifting cylinder device flows to a hydraulic pump operated as a motor, which drives a generator . If the lowering pressure of the lifting cylinder device measured with a pressure sensor is below the defined minimum pressure, the valve-controlled load lowering takes place in which the proportional valve is actuated to position C, in which the sink current flowing out of the lifting cylinder device flows into the container via a two-way flow regulator.
  • the CN 102 628 455 A discloses a hydraulic circuit for energy recovery, in which, in the lowering position of a directional control valve, the pressure medium line leading to the lifting cylinder is connected to a container line leading to a container.
  • a switching valve is arranged in the container line, which connects the container line to the container via a speed limiting valve in the right switch position and enables energy recovery in the left switch position by connecting the container line to the suction side of the hydraulic pump.
  • the switching valve is actuated by a spring in the left switching position.
  • the EP 2 962 981 A1 discloses a hydraulic system of a battery-electrically operated industrial truck, in which an electrically operated shut-off valve (“lowering switch valve”) is installed in the lowering branch K2 of the lifting cylinder leading to the container Flow rate control valve and a lowering proportional valve are arranged. Between the shut-off valve and the lowering switch valve
  • a line K1 is routed to the suction side of the hydraulic pump in order to enable energy recovery in the lowering operation of the lifting cylinder or to enable a further consumer to be supplied with the sinking current flowing out of the lifting cylinder.
  • the DE 10 2016 103 256 A1 discloses industrial truck with a mast that has a free lift and a mast lift.
  • an electrically operated proportional valve device is provided in addition to a lift valve and a lower valve, with which the hydraulic relationships between a free lift cylinder and a mast lift cylinder are influenced in such a way that a smooth transition between the Free lift and the mast lift is achieved without loss of speed.
  • a lifting device of an industrial truck which does not require a flow control valve and in which the control valve device is controlled in such a way that the maximum permissible lowering speed of 0.6 m / s is maintained in the lowering mode of the load handling device with the help of an electronic detection of the lowering speed of the load handling device.
  • the present invention is based on the object of providing an industrial truck of the type mentioned at the outset which manages with a low level of reliability of a sensor device and, in the event of a fault in the sensor device, allows the truck to continue operating while maintaining the limit value of 0.6 m / s for the maximum permissible lowering speed allows.
  • the switching valve is designed as a three-port, two-position valve, which is connected with a first connection to the section of the container line that is connected to the control valve device, and at a second connection to the section of the Container line is connected and is connected at a third connection to a drain line leading to the container, the switching valve in the first switching position connecting the first connection to the second connection and the third connection being blocked and the switching valve being the first connection in the second switching position connects to the third connection and the second connection is blocked, the switching valve being actuated by means of an electronic control device and the switching valve being actuatable into the first switching position by a spring device and by means of an electrical actuating device, in particular a switching magnet, which is in operative connection with the electronic control device, can be actuated into the second switching position.
  • a switching valve is thus provided in the container line, which makes it possible to switch on the discharge flow control valve arranged in the container line and thus to activate it, to switch it off and thus to deactivate it. If the discharge flow control valve is deactivated, in lowering operation of the lifting cylinder device, the pressure medium flow flows from the lifting cylinder device to the container, bypassing the discharge flow control valve arranged in the container line, so that a high lowering speed can also be achieved above the limit value of 0.6 m / s, which results in a high turnover rate of the truck is achievable.
  • the discharge flow control valve can be activated so that when the lifting cylinder device is in lowering mode, the pressure medium flow flows away from the lifting cylinder device to the container via the discharge flow control valve arranged in the container line and the discharge flow control valve ensures compliance with the maximum lowering speed to the limit value of 0.6 m / s in the tank line.
  • the sensor device for example a detection of the lowering speed of the load handling device
  • the industrial truck can continue to operate while maintaining the limit value of 0.6 m / s for the maximum permissible lowering speed of the load handling device, for example until the sensor device is repaired.
  • the switching valve is also designed as a three-port, two-position valve, which is connected with a first connection to the section of the container line that is connected to the control valve device, at a second connection to the section of the container line that is connected to the discharge flow control valve and at a
  • the third connection is connected to a drain line leading to the container, the switching valve connecting the first connection to the second connection in the first switching position and the third connection being blocked and the switching valve connecting the first connection to the third connection in the second switching position and the second connection is blocked.
  • the switching valve is also actuated by means of an electronic control device.
  • an electrically operated switching valve which is connected to an electronic control device for actuation and control, the discharge flow control valve arranged in the container line can be activated in the first switching position of the switching valve and thus switched on and in the second switching position of the switching valve in a simple manner and with little additional effort deactivated and thus switched off.
  • the switching valve can also be actuated by a spring device into the first switching position and can be actuated into the second switching position by means of an electrical actuating device, in particular a switching magnet, which is operatively connected to the electronic control device.
  • the control valve device is expediently designed as a proportional valve which is actuated by the electronic control device.
  • the lowering speed of the load-bearing means can be specified in a simple manner by the electronic control device in lowering operation by appropriate control of the proportional valve.
  • the electronic control device is connected to a sensor device that detects the lowering speed of the load-bearing means, the electronic control device being designed in such a way that when the load-bearing means is in lowering mode, the electronic control device actuates the switching valve into the second switching position in normal operation and the sensor device is functional in the event of a fault in the sensor device, the switching valve is actuated into the first switching position.
  • the pressure medium flow thus flows from the lifting cylinder device to the container, bypassing the discharge flow control valve arranged in the container line.
  • the lowering speed of the load-bearing means is regulated by means of the electronic control device by appropriate activation of the control valve device, which is designed as a proportional valve, into the lowering position.
  • Normal operation with a functional sensor device is to be understood here as a state in which the detection of the lowering speed of the load-bearing means is available or supplies a plausible signal.
  • the switching valve is actuated to the first switching position and the discharge flow control valve arranged in the container line is activated and thus switched on.
  • the pressure medium stream flows from the lifting cylinder device to the container via the discharge flow control valve arranged in the container line, so that the discharge flow control valve in the container line ensures compliance with the limit value of 0.6 m / s for the maximum lowering speed regardless of the load.
  • the discharge flow control valve arranged in the container line is preferably set in such a way that the maximum permitted lowering speed of 0.6 m / s is not exceeded in any lifting stage of the lifting frame.
  • the industrial truck can thus continue to operate safely at a maximum lowering speed limited to the limit value of 0.6 m / s until the sensor device is repaired.
  • the sensor device which detects the lowering speed of the load handling device can for example be designed as a lifting height sensor of the load handling device, the lowering speed of the lifting device being calculated in the electronic control device from the lifting height signal of the lifting height sensor.
  • a lifting height sensor of this type designed for example as a length sensor, the distance of the load-handling device is measured relative to the roadway or to the industrial truck.
  • the lowering speed of the load-handling device can be calculated in a simple manner from the length signal of the lifting height sensor by deriving it over time.
  • the lifting height sensor can be designed, for example, as a cable length sensor which is arranged on the lifting frame or the vehicle body of the industrial truck and has a cable means connected to the load handling device.
  • a lifting height sensor of this type the lifting height to the vehicle body of the industrial truck can be measured in a simple manner and the lowering speed of the load handling device can be calculated from the lifting height signal in the electronic control device.
  • the sensor device which detects the lowering speed of the load suspension device can also be designed as a flow meter.
  • a flow meter can be used in a simple manner in the electronic Control device, the lowering speed of the load handling device can be calculated.
  • a further discharge flow control valve is arranged in the discharge line. This makes it possible with the switching valve to switch between the discharge flow control valve arranged in the container line and the further discharge flow control valve arranged in the discharge line. This makes it possible for certain operating states, for example a lowering process without load, to increase the maximum permissible lowering speed compared to the limit value of 0.6 m / s by activating the further discharge flow control valve in the discharge line by means of the switching valve in such operating conditions.
  • the discharge flow control valve in the container line is set to a first maximum sink speed and the further discharge flow control valve in the discharge line is set to a second maximum sink speed, the second maximum sink speed being higher than the first maximum sink speed. If the discharge flow control valve arranged in the discharge line is set in such a way that the limit value of 0.6 m / s is maintained in sink operation, a higher sink speed can be achieved in certain operating states with the further discharge flow control valve arranged in the discharge line.
  • the electronic control device is connected to a sensor device that detects a load on the load-handling device, the electronic control device being designed in such a way that, when the load-handling device is in lowering mode, the electronic control device switches the switching valve to the first switching position is actuated and the switching valve is not actuated into the second switching position when the load is not detected by the sensor direction.
  • the discharge flow control valve arranged in the container line is thus set to a maximum lowering speed for the operating state "with load", for example the prescribed limit value of 0.6 m / s, and the further discharge flow control valve arranged in the discharge line is set to a higher maximum lowering speed for the operating state "without Last "is set.
  • the sensor device which detects a load on the load-handling device, can be designed, for example, as a pressure sensor which detects the load pressure in the pressure medium line leading from the control valve device to the lifting cylinder device.
  • the sensor device which detects a load on the load handling device, can be an optical sensor or a release switch to be actuated by the driver.
  • the electronic control device advantageously actuates the switching valve into the first switching position in the event of a fault in the sensor device detecting the load. Since in the first switch position the lowering operation takes place via the discharge flow control valve located in the container line, which is set to the lower maximum lowering speed, in the event of an error in the detection of the load on the load handling device, the truck can continue to operate safely while adhering to the limit value of 0.6 m / s can be achieved for the maximum permissible lowering speed of the load handling device, for example until the load detection system has been repaired.
  • the switching valve can be actuated as a function of the actuation of an input device actuated by a driver of the industrial truck.
  • the input device can be formed, for example, by a switch to be operated by the driver. The driver is thus consciously given the option of selecting an increased lowering speed via the input device.
  • This also makes it possible, in a simple manner, by appropriate actuation of the switching valve, on the one hand to maintain the limit value of 0.6 m / s for the lowering speed or, on the other hand, to lower the load handling device with an increased maximum lowering speed, whereby an increase in the handling capacity of the industrial truck can be achieved.
  • the driver can switch the switching valve by operating the input device perform, for example, in order to consciously select an increased maximum lowering speed for the load handling device if, for example, the picked up load is insensitive or the picked up load is clamped.
  • the prerequisite for the increased maximum lowering speed of the load handling device can be a functioning sensor device with which the lowering speed of the load handling device is detected.
  • the lifting frame has at least two lifting stages and a discharge flow control valve assigned to the lifting stage is provided for each lifting stage, the discharge flow control valve arranged in the container line being assigned to the first lifting stage and the discharge flow control valve arranged in the discharge line being assigned to the second lifting stage, wherein the electronic control device is connected to a sensor device that detects the lifting stages, the electronic control device being designed such that, in lowering operation of the load-bearing device, the electronic control device actuates the switching valve into the second switching position when the second lifting stage is detected by the sensor device and when one is operated by the sensor device detected first lift stage actuates the switching valve in the first switching position.
  • such lifting stages can be designed as a free lift as the first lift stage and a mast lift as the second lift stage.
  • a discharge flow control valve assigned to the corresponding lifting stage is provided for each lifting stage of the lifting frame.
  • a number of discharge flow control valves are thus provided in accordance with the number of different lifting stages of the lifting frame.
  • the discharge flow control valves are each set in such a way that they limit the maximum lowering speed of the assigned lifting stage, for example to the limit value of 0.6 m / s.
  • the electronic control device uses the sensor device in the lowering mode of the load handling device to detect the lifting stage that the load handling device is currently passing through, and the discharge flow control valve assigned to the lifting step is activated by appropriate control of the switching valve, so that the appropriate discharge flow control valve is switched to the currently active lifting step will.
  • the sensor device with which the lifting stages of the lifting frame are detected can be formed, for example, by a switching contact or a plurality of switching contacts.
  • the sensor device with which the lifting stages of the lifting frame are detected can also be formed by a pressure sensor which detects the load pressure in the pressure medium line leading from the control valve device to the lifting cylinder device. Since different lifting cylinders are used for each lifting stage, the load pressures in the corresponding lifting stages also differ for the same load on the load handling device, so that the currently active lifting stage can also be recognized with a pressure sensor that detects the pressure in the pressure medium line.
  • the discharge flow control valve arranged in the container line is assigned to the fastest lowering lifting stage and limits the maximum lowering speed of this lifting stage and the further discharge flow control valve is assigned to a more slowly lowering lifting stage and limits the maximum lowering speed of this lifting stage, with the electronic control device in the event of a fault the sensor device actuates the switching valve in the first switching position.
  • the discharge flow control valves advantageously limit the maximum lowering speed of the different lift stages to the same limit value of, for example, 0.6 m / s.
  • the lifting step of a lifting frame that lowers the fastest is usually the free lift of the lifting frame, and the mast lift forms a lifting step that lowers more slowly than the free lift.
  • the electronic control device actuates the switching valve in the first switching position in the event of a fault in the sensor device with which the corresponding stroke stage can be detected, a high level of operational reliability can be achieved and the truck can continue to operate safely while maintaining the limit value of 0.6 m / s for the maximum permissible lowering speed of the load handling device can be achieved, for example until the lifting stage detection is repaired, since in the first switching position of the switching valve the discharge flow control valve located in the container line limits the maximum lowering speed of all lifting stages and is therefore switched to the lowest lowering speed in the event of a fault in the sensor device.
  • FIG. 1 is a schematic structure of a lifting device 1 of a not shown industrial truck of the prior art.
  • the lifting device 1 consists of a lifting frame 2, on which a load-handling device 3 is arranged so that it can be raised and lowered.
  • the load-bearing means 3 consists of a lifting carriage 4 which can be moved vertically in the lifting frame 2 and to which, for example, a load fork 5 formed by fork prongs is attached as an attachment.
  • a hydraulic lifting cylinder device 11 is provided for raising and lowering the load suspension device 3.
  • the lifting frame consists of a standing mast 2a and an extending mast 2b which can be raised and lowered on the standing mast 2a and on which the load-bearing means 3 is arranged such that it can be raised and lowered.
  • the lifting cylinder device 11 is used to raise and lower the extending mast 2b relative to the standing mast 2a.
  • a flexible traction means 6, for example a lifting chain is provided, which is fastened with a first end to the lifting carriage 4.
  • the traction means 6 is guided over a pulley 7 at the upper end of the extendable mast 2b and is fastened with a second end to the standing mast 2a.
  • the lifting cylinder device 11 can be actuated by means of a control valve device 12 for raising and lowering the load-bearing means 3.
  • the control valve device 12 is In the exemplary embodiment shown, it is designed as a proportional valve 13 which throttles in intermediate positions and has a blocking position 13a configured as a neutral position, a raised position 13b and a lowering position 13c.
  • the proportional valve 13 is connected to a delivery line 14 of a pump 15, which sucks pressure medium from a container 17 by means of a suction line 16, to a container line 18 leading to the container 17 and to a pressure medium line 19 leading to the lifting cylinder device 11.
  • the blocking position 13a of the control valve device 12 the connection of the pressure medium line 19 to the delivery line 14 and the container line 18 is blocked.
  • the delivery line 14 In the raised position 13b of the control valve device 12, the delivery line 14 is connected to the pressure medium line 19.
  • the pressure medium line 19 is connected to the container line 18.
  • the control valve device 12 can be actuated electrically.
  • an electrical actuation device 20a is provided, when activated, the control valve device 12 is actuated in the direction of the lowering position 13c.
  • the control valve device 12 can be actuated in the direction of the lifting position 13b by means of a further electrical actuating device 20b.
  • the actuating devices 20a, 20b are designed, for example, as a magnet, in particular a proportional magnet.
  • an electronic control device 25 is provided, which is connected to the actuating devices 20a, 20b.
  • control valve device 12 By means of a spring device formed by two springs 24a, 24b, the control valve device 12 is actuated in the non-activated and de-energized state into the blocking position 13a designed as a neutral position.
  • the electronic control device 25 is connected to a control element 26 that can be operated by an operator, for example a joystick, which can be actuated to initiate a lifting process or a lowering process of the load handling device 3 and a lifting speed can be specified in the lifting mode and a lowering speed can be specified in the lowering mode.
  • a control element 26 can be operated by an operator, for example a joystick, which can be actuated to initiate a lifting process or a lowering process of the load handling device 3 and a lifting speed can be specified in the lifting mode and a lowering speed can be specified in the lowering mode.
  • a discharge flow control valve 30 is arranged in the container line 18.
  • the discharge flow control valve 30 is designed as a proportional valve that throttles in intermediate positions and has a flow position 30a and a blocking position 30b.
  • the discharge flow control valve 30 is actuated by a spring 31 and the pressure in the container line 18 between the control valve device 12 and the discharge flow control valve 30 in the direction of the flow position 30a.
  • a corresponding control line 32 is routed from the container line 18 to a control pressure surface of the discharge flow control valve 30 that acts in the direction of the throughflow position 30a.
  • a throttle 33 is arranged in the control line 32.
  • the discharge flow control valve 30 is actuated by the pressure in the pressure medium line 19 in the direction of the blocking position 30b.
  • a corresponding control line 34 is routed from the pressure medium line 19 to a control pressure surface of the discharge flow control valve 30 that acts in the direction of the blocking position 30b.
  • a throttle 35 is arranged in the control line 34.
  • control valve device 12 and the discharge flow control valve 30 are arranged in a control valve block 40.
  • control valve device 12 To lift the load handling device 3, the control valve device 12 is actuated into the lifting position 13b, so that the pump 15 sucks pressure medium from the container 17 by means of the suction line 16 and delivers it into the delivery line 14 to the control valve device 12. In the raised position 13b, the control valve device 12 connects the delivery line 14 to the pressure medium line 19, so that the pump 15 delivers pressure medium to the lifting cylinder device 11.
  • control valve device 12 is actuated into the lowering position 13c. Pressure medium thus flows from the lifting cylinder device 11 via the pressure medium line 19 into the container line 18 and to the discharge flow control valve 30.
  • the discharge flow control valve 30 limits the maximum volume flow flowing off from the lifting cylinder device 11 to the container 17, independently of the load, to a fixed value.
  • the discharge flow control valve 30 is set in such a way that a maximum permissible lowering speed of the load-bearing means 3 of 0.6 m / s is maintained. Lower lowering speeds are achieved by the than Proportional valve 13 trained control valve device 12 controlled by varying the lowering position 13c. After flowing through the discharge flow control valve 30, the pressure medium flowing out of the lifting cylinder device 11 arrives in the container 17 in the lowering operation of the load receiving means 3.
  • FIG 2 is a schematic structure of a first embodiment of the lifting device 1 of a not shown industrial truck according to the invention. Same components as the Figure 1 are provided with the same reference numbers.
  • a switching valve 45 is arranged between the control valve device 12 and the discharge flow control valve 30, which in a first switching position 45a activates the discharge flow control valve 30 arranged in the container line 18, so that when the lifting cylinder device 11 is operating in the lowering mode, the pressure medium flow via the pressure medium flow arranged in the container line 18
  • the discharge flow control valve 30 flows from the lifting cylinder device 11 to the container 17, and in a second switching position 45b the discharge flow control valve 30 arranged in the container line 18 is deactivated, so that in the lowering operation of the lifting cylinder device 11 the pressure medium flow bypassing the discharge flow control valve 30 arranged in the container line 18 from the lifting cylinder device 11 flows to the container 17.
  • the discharge flow control valve 45 arranged in the container line 18 can thus be switched on in the first switching position 45a and switched off in the second switching position 45b.
  • the switching valve 45 is designed as a three-port, two-position valve, which is connected with a first port A1 to the section of the container line 18 that is connected to the control valve device 12, and at a second port A2 to the section of the container line 18 that is connected to the discharge flow control valve 30 is connected and is connected at a third connection A3 to a drain line 46 led to the container 17.
  • the drain line 46 forms a bypass line which bypasses the drain flow control valve 30 arranged in the container line 18.
  • the switching valve 45 connects the first port A1 to the second port A2 and blocks the third port A3.
  • the switching valve 45 connects in the second Switching position 45b connects the first port A1 to the third port A3 and blocks the second port A2.
  • the switching valve 45 can be actuated electrically and is connected to the electronic control device 25 for control.
  • the switching valve 45 can be actuated by a spring device 47 into the first switching position 45a and can be actuated into the second switching position 45b by means of an electrical actuating device 48, in particular a switching magnet, which is operatively connected to the electronic control device 25.
  • the electronic control device 25 is connected to a sensor device 50 which detects the lowering speed of the load-bearing means 3.
  • the sensor device 50 is designed as a lift height sensor 51, with which the lift height of the load-bearing means 3 can be measured.
  • the lifting height sensor 51 is designed as a cable length sensor 52, which comprises a housing fastened to the standing mast 2a and a cable means 53 connected to the load-bearing means 3.
  • the lowering speed of the load-bearing means 3 is calculated in the electronic control device 25 by deriving it over time.
  • the electronic control device 25 also outputs corresponding control commands to the control valve device 12 and the switching valve 45.
  • the electronic control device 25 is designed in such a way that in the lowering operation of the load-bearing device 3, the electronic control device 25 in normal operation with the functional sensor device 50 actuates the switching valve 45 into the second switching position 45b and, in the event of a fault in the sensor device 50, the switching valve 45 is actuated into the first switching position 45a.
  • a failure of the sensor device 50 occurs, for example, if the sensor device 50 fails or if the sensor device 50 does not deliver a plausible signal.
  • the switching valve 45 connects the pressure medium flow coming from the control valve device 12 to the discharge flow control valve 30 in lowering operation of the load receiving means 3, so that the maximum lowering speed is set to the value set on the discharge flow regulating valve 30, for example 0 , 6m / s, is adhered to.
  • the maximum lowering speed of the load-bearing means 3 is thus analogous to that Figure 1 limited to the setting value of the discharge flow control valve 30.
  • the sensor device 50 If the sensor device 50 is functional and is therefore available and in the lowering operation of the load-bearing device 3 in normal operation with the functional sensor device 50, the sensor device 50 delivers a plausible signal to the electronic control device 25, the switching valve 45 is activated by the electronic control device 25 by energizing the actuating device 48 operated in the second switching position 45b. In the second switching position 45b, the pressure medium coming from the control valve device 12 located in the lowering position 13c flows via the drain line 46 and thus bypassing the drain flow control valve 30 located in the container line 18 into the container 17. The drain flow control valve 30 located in the container line 18 is thus deactivated and switched off.
  • the lowering speed of the load suspension means 3 is controlled or regulated solely by the position of the valve slide of the proportional valve 13 in the direction of the lowering position 13c.
  • the electronic control device 25 controls the proportional valve 13, for example, in such a way that the maximum permissible lowering speed of 0.6 m / s is not exceeded, regardless of the load and the viscosity of the pressure medium, but is approximated as closely as possible.
  • the switching valve 45 is not activated by the electronic control device 25 and the switching valve 45 is actuated by the spring 47 in the first switching position 45a .
  • the first switching position 45a the pressure medium coming from the control valve device 12 located in the lowering position 13c flows through the discharge flow control valve 30 arranged in the container line 18 The discharge flow control valve 30 arranged in the container line 18 is thus activated and switched on.
  • the discharge flow control valve 30 is set in such a way that the maximum permissible lowering speed of the load handling device 3 of 0.6 m / s is maintained in each lifting stage of the lifting frame 2, regardless of the load on the load handling device 3.
  • the industrial truck can thus continue to operate safely at a reduced lowering speed of the load handling device 3 until the sensor device 50 is repaired and while maintaining the maximum permissible lowering speed of the load handling device 3 of 0.6 m / s.
  • the execution of the Figure 2 enables the maximum permissible lowering speed of the load handling device 3 of 0.6 m / s to be used in the best possible way with a mast 2 with several lifting stages, whereby an increase in the throughput of the industrial truck can be achieved.
  • Lower reliability requirements performance level
  • the industrial truck can continue to operate with minor restrictions on the maximum achievable lowering speed until the sensor device 50 is repaired, so that the industrial truck is highly available.
  • FIG 3 is a schematic structure of a second embodiment of the lifting device 1 of a not shown industrial truck according to the invention. Same components with the Figures 1 and 2 are provided with the same reference numbers.
  • a further discharge flow control valve 60 is arranged in the discharge line 46.
  • the outflow flow control valve 60 is designed as a proportional valve which throttles in intermediate positions and has a flow position 60a and a blocking position 60b.
  • the discharge flow control valve 60 is actuated by a spring 61 and the pressure in the discharge line 46 between the switching valve 45 and the discharge flow control valve 60 in the direction of the flow position 60a.
  • a corresponding control line 62 is from the drain line 46 to a in the direction of
  • a throttle 63 is arranged in the control line 62.
  • the discharge flow control valve 60 is actuated by the pressure in the pressure medium line 19 in the direction of the blocking position 60b.
  • a corresponding control line 64 is connected to the control line 34 of the discharge flow control valve 30 and is routed from the control line 34 to a control pressure surface of the discharge flow control valve 60 that acts in the direction of the blocking position 60b.
  • the discharge flow control valve 30 in the container line 18 is set to a first maximum sink speed, for example the value of 0.6 m / s, and the further discharge flow control valve 60 in the discharge line 46 is set to a second maximum sink speed, the second maximum sink speed being higher than the first maximum Lowering speed is.
  • the electronic control device 25 is connected to a sensor device 65 which detects a load on the load-bearing means 3.
  • the sensor device 65 is designed as a pressure sensor 66 which detects the pressure in the pressure medium line 19.
  • the sensor device 65 can be designed as an optical sensor which detects a load located on the load handling device 3.
  • the electronic control device 25 is designed in such a way that, in the lowering mode of the load-bearing device 3, the electronic control device 25 actuates the switching valve 45 into the first switching position 45a when the sensor device 65 detects a load and the switching valve 45 into the second when there is no load detected by the sensor device 65 Switch position 45b actuated.
  • the electronic control device actuates the switching valve 45 into the first switching position 45a.
  • the switching valve 45 connects the pressure medium flow coming from the control valve device 12 with that in the lowering operation of the load receiving means 3 Container line 18 arranged discharge flow control valve 30, which is set to the lower maximum sink speed.
  • the switching valve 45 is actuated in the first switching position 45a when the sensor device 65 detects a load on the load handling device 3 and thus the lowering operating state "with load” and when there is a fault in the sensor device 65, for example the sensor device 65 has failed or none provides a plausible signal.
  • the pressure medium coming from the control valve device 12 located in the lowering position 13c flows through the discharge flow control valve 30 arranged in the container line 18, which in each lifting stage of the lifting frame 2 reduces the maximum permissible lowering speed of the load handling device 3 to a value of 0.6 m / s limited.
  • the electronic control device 25 actuates the switching valve 45 by energizing the actuating device 48 into the second switching position 45b.
  • the pressure medium coming from the control valve device 12 located in the lowering position 13c flows into the container 17 via the discharge line 46 and via the further discharge flow control valve 60, which is set to a higher maximum lowering speed, so that a higher maximum lowering speed of the empty load suspension means 3 can be achieved with a maximum lowering speed above 0.6 m / s.
  • the execution of the Figure 3 makes it possible to switch between two discharge flow control valves 30, 60 with the switching valve 45, the discharge flow control valve 30 being set to a maximum permissible lowering speed of the load handling device 3 with load and the discharge flow control valve 60 being set to a maximum permissible lowering speed of the load handling device 3 without load.
  • the switching valve 45 is switched over as a function of the load detection by the sensor device 65. If the load detection fails, the lower maximum permissible lowering speed is selected.
  • the maximum permissible lowering speed of the load handling device for the operating state without a load can be increased compared to the limit value of 0.6 m / s, which increases the handling capacity of the industrial truck.
  • To the Sensor device 65 can have lower reliability requirements (performance level), so that there is less construction effort with correspondingly reduced costs for sensor device 65.
  • performance level the industrial truck can continue to operate with minor restrictions in the achievable maximum lower lowering speed until the sensor device 65 is repaired, so that a high availability of the industrial truck results.
  • FIG 4 is a schematic structure of a third embodiment of the lifting device 1 of a not shown industrial truck according to the invention. Same components with the Figures 1 to 3 are provided with the same reference numbers.
  • the mast 2 of the Figure 4 has at least two lift stages.
  • a hydraulic lifting cylinder device 11a is provided for raising and lowering the load-bearing means 3 relative to the extending mast 2b.
  • the lift cylinder device 11a forms a first lift stage (free lift).
  • the flexible traction means 6, for example a lifting chain is provided, which in the Figure 4 is fastened with a first end to the lifting carriage 4, is guided via a pulley 7 on the extendable piston rod of the lifting cylinder device 11a and is fastened with a second end to the extendable mast 2b.
  • the hydraulic lifting cylinder device 11b is used to raise and lower the extending mast 2b relative to the standing mast 2a.
  • the lifting cylinder device 11b forms a second lifting stage (mast lift).
  • the lifting cylinder device 11a is connected to the lifting cylinder device 11b by means of a pressure medium line 75.
  • a discharge flow control valve 30, 60 assigned to the lift stage is provided for each lift stage.
  • the discharge flow control valve 30 arranged in the container line 18 is assigned to the first lift stage (free lift) and the discharge flow control valve 60 arranged in the discharge line 46 is assigned to the second lift stage (mast lift).
  • the electronic control device 25 is connected to a sensor device 70 that detects the stroke stages.
  • the sensor device 70 is designed as a pressure sensor 66 which detects the pressure in the pressure medium line 19. Since the two lifting cylinder devices 11a, 11b have different cross-sectional areas, the respective lifting stage can be detected via the pressure sensor 66.
  • the sensor device 70 can be designed as one or more switches 71.
  • the electronic control device 25 is designed in such a way that, in the lowering mode of the load-bearing device 3, the electronic control device 25 actuates the switching valve 45 into the second switching position 45b when the sensor device 70 detects the second lifting stage (mast lift) and when the first lifting stage is detected by the sensor device 70 (free lift ) the switching valve 45 is actuated into the first switching position 45a.
  • the first lift stage (free lift) forms the mast 2 of the Figure 4 the fastest lowering lifting stage.
  • the discharge flow control valve 30 in the container line 18 is thus assigned to the fastest lowering lift stage (free lift) and limits the maximum lowering speed of this lift stage (free lift), for example to a value of 0.6 m / s.
  • the further discharge flow control valve 60 in the discharge line 46 is assigned to the slower lowering lifting stage (mast lift) and limits the maximum lowering speed of this lifting step (mast lift), for example likewise to a value of 0.6 m / s.
  • the electronic control device 25 actuates the switching valve 45 into the first switching position 45a.
  • the respective lifting stage which is currently being passed through by the load-handling device 3 in the lowering mode is thus detected with the sensor device 70.
  • a corresponding number of discharge flow control valves 30, 60 are provided, which are each set such that they limit the maximum lowering speed of the assigned lifting stage.
  • the discharge flow control valve 30 or 60 assigned to the active lifting stage is switched on and activated by the electronic control device 25 by appropriate actuation of the switching valve 45 in the lowering operation of the load receiving means 3.
  • the switching valve 45 In the event of a failure of the sensor device 70 for the lift stage recognition by appropriately activating the switching valve 45, it is switched to the discharge flow control valve 30 of the fastest lowering lift stage and thus to the lowest lowering speed.
  • the execution of the Figure 4 enables the maximum permissible lowering speed of the load handling device 3 of 0.6 m / s to be used in the best possible way with a mast 2 with several lifting stages, whereby an increase in the throughput of the industrial truck can be achieved.
  • Lower reliability requirements performance level
  • the industrial truck can continue to be operated with minor restrictions in the achievable maximum lowering speed until the sensor device 70 is repaired, so that the industrial truck is highly available.
  • control valve device 12 is not limited to those in the Figures 2 to 4
  • the illustrated embodiment of the control valve device 12 is limited.
  • the control valve device 12 can be actuated electro-hydraulically, the actuating devices 20a, 20b actuating electrically controllable pilot valves with which the control valve device 12 is moved into the lowering position 13c or the lifting position 13b actuating control pressure is generated.
  • control valve device 12 it is possible to design the control valve device 12 with separate control valves for the lifting operation and the lowering operation.

Landscapes

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

Claims (10)

  1. Chariot de manutention, comprenant un dispositif de levage (1), un mât de levage, un dispositif de soupape de commande (12), une conduite de fluide sous pression (19), un récipient (17), une conduite de récipient (18) et une conduite d'évacuation (46), le dispositif de levage (1) présentant un moyen de réception de charge (3) disposé de manière à pouvoir être relevé et abaissé sur un mât de levage (2), dans lequel, pour relever et abaisser le moyen de réception de charge (3), un dispositif de vérin de levage hydraulique (11 ; 11a, 11b) est prévu qui peut être actionné au moyen du dispositif de soupape de commande (12), le dispositif de soupape de commande (12) étant raccordé à la conduite de fluide sous pression (19) amenée au dispositif de vérin de levage (11 ; 11a, 11b) et à la conduite de récipient (18) amenée à un récipient (17), et le dispositif de soupape de commande (12) présentant une position abaissée (13c) dans laquelle la conduite de fluide sous pression (19) est reliée à la conduite de récipient (18), une soupape de réglage de courant d'évacuation (30) étant disposée dans la conduite de récipient (18), dans lequel, dans la conduite de récipient (18), entre le dispositif de soupape de commande (12) et la soupape de réglage de courant d'évacuation (30), une soupape de commutation (45) est disposée qui active dans une première position de commutation (45a) la soupape de réglage de courant d'évacuation (30) disposée dans la conduite de récipient (18) de sorte qu'en mode abaissement du dispositif de vérin de levage (11 ; 11a, 11b), le courant de fluide sous pression s'écoule par l'intermédiaire de la soupape de réglage de courant d'évacuation (30) disposée dans la conduite de récipient (18) du dispositif de vérin de levage (11 ; 11a, 11b) au conteneur (17), et qui désactive dans une deuxième position de commutation (45b) la soupape de réglage de courant d'évacuation (30) disposée dans la conduite de récipient (18) de sorte qu'en mode abaissement du dispositif de vérin de levage (11 ; 11a, 11b) le courant de fluide sous pression s'écoule en contournant la soupape de réglage de courant d'évacuation (30) disposée dans la conduite de récipient (18) du dispositif de vérin de levage (11 ; 11a, 11b) au récipient (17),
    caractérisé en ce que le chariot de manutention est en outre pourvu d'un dispositif de commande électronique (25), d'un dispositif faisant ressort (47) et d'un dispositif d'actionnement électrique (48), et en ce que la soupape de commutation (45) est réalisée comme une soupape à deux positions et à trois voies qui est raccordée par un premier raccord (A1) à la partie de la conduite de récipient (18) en communication avec le dispositif de soupape de commande (12), au niveau d'un deuxième raccord (A2) à la partie de la conduite de récipient (18) en communication avec la soupape de réglage de courant d'évacuation (30) de la conduite de récipient (18) et au niveau d'un troisième raccord (A3) à une conduite d'évacuation (46) amenée au récipient (17), la soupape de commutation (45), dans la première position de commutation (45a), reliant le premier raccord (A1) au deuxième raccord (A2), et le troisième raccord (A3) étant coupé, et la soupape de commutation (45), dans la deuxième position de commutation (45b), reliant le premier raccord (A1) au troisième raccord (A3), et le deuxième raccord (A2) étant coupé, la soupape de commutation (45) étant actionnée au moyen du dispositif de commande électronique (25), et la soupape de commutation (45) pouvant être actionnée par le dispositif faisant ressort (47) dans la première position de commutation (45a) et pouvant être actionnée dans la deuxième position de commutation (45b) au moyen du dispositif d'actionnement électrique (48), en particulier au moyen d'un solénoïde qui est en relation active avec le dispositif de commande électronique (25) .
  2. Chariot de manutention selon la revendication 1, caractérisé en ce que le dispositif de soupape de commande (12) est réalisé sous la forme d'une soupape proportionnelle (13) qui est actionnée par le dispositif de commande électronique (25).
  3. Chariot de manutention selon la revendication 1 ou 2, caractérisé en ce que le dispositif de commande électronique (25) est en communication avec un dispositif capteur (50) détectant la vitesse d'abaissement du moyen de réception de charge (3), le dispositif de commande électronique (25) étant réalisé de telle sorte qu'en mode abaissement du moyen de réception de charge (3), le dispositif de commande électronique (25) actionne en mode normal, lorsque le dispositif capteur (50) est opérationnel, la soupape de commutation (45) dans la deuxième position de commutation (45b), et en cas de défaut, le dispositif capteur (50) actionne la soupape de commutation (45) dans la première position de commutation (45a).
  4. Chariot de manutention selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une autre soupape de réglage de courant d'évacuation (60) est disposée dans la conduite d'évacuation (46).
  5. Chariot de manutention selon la revendication 4, caractérisé en ce que la soupape de réglage de courant d'évacuation (30) dans la conduite de récipient (18) est réglée sur une première vitesse d'abaissement maximale, et l'autre soupape de réglage de courant d'évacuation (60) dans la conduite d'évacuation (46) est réglée sur une deuxième vitesse d'abaissement maximale, la deuxième vitesse d'abaissement maximale étant supérieure à la première vitesse d'abaissement maximale.
  6. Chariot de manutention selon l'une quelconque des revendications 1 à 2 et l'une quelconque des revendications 4 et 5, caractérisé en ce que le dispositif de commande électronique (25) est en communication avec un dispositif capteur (65) détectant une charge sur le moyen de réception de charge (3), le dispositif de commande électronique (25) étant réalisé de telle sorte qu'en mode abaissement du moyen de réception de charge (3), le dispositif de commande électronique (25) actionne pour une charge détectée par le dispositif capteur (65) la soupape de commutation (45) dans la première position de commutation (45a), et si aucune charge n'est détectée par le dispositif capteur (65), actionne la soupape de commutation (45) dans la deuxième position de commutation (45b).
  7. Chariot de manutention selon la revendication 6, caractérisé en ce qu'en cas de défaut du dispositif capteur (65), le dispositif de commande électronique (25) actionne la soupape de commutation (45) dans la première position de commutation (45a).
  8. Chariot de manutention selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la soupape de commutation (45) peut être actionnée en fonction de l'actionnement d'un dispositif d'entrée actionné par un conducteur du chariot de manutention.
  9. Chariot de manutention selon l'une quelconque des revendications 1 à 2 et l'une quelconque des revendications 4 et 5, caractérisé en ce que le mât de levage (2) présente au moins deux niveaux de levage, et pour chaque niveau de levage, une soupape de réglage de courant d'évacuation (30, 60) associée au niveau de levage est prévue, la soupape de réglage de courant d'évacuation (30) disposée dans la conduite de récipient (18) étant associée au premier niveau de levage, et la soupape de réglage de courant d'évacuation (60) disposée dans la conduite d'évacuation (46) étant associée au deuxième niveau de levage, le dispositif de commande électronique (25) étant en communication avec un dispositif capteur (70) détectant les niveaux de levage, le dispositif de commande électronique (70) étant réalisé de telle sorte qu'en mode abaissement du moyen de réception de charge (3), le dispositif de commande électronique (25), si le dispositif capteur (70) détecte le deuxième niveau de levage, actionne la soupape de commutation (45) dans la deuxième position de commutation (45b), et si le dispositif capteur (70) détecte un premier niveau de levage, actionne la soupape de commutation (45) dans la première position de commutation (45a).
  10. Chariot de manutention selon la revendication 9, caractérisé en ce que la soupape de réglage de courant d'évacuation (30) disposée dans la conduite de récipient (18) est associée au niveau de levage avec l'abaissement le plus rapide, et limite la vitesse d'abaissement maximale de ce niveau de levage, et l'autre soupape de réglage de courant d'évacuation (60) est associée à un niveau de levage avec un abaissement plus lent et limite la vitesse d'abaissement maximale de ce niveau de levage, le dispositif de commande électronique (25) actionnant en cas de défaut du dispositif de capteur (70) la soupape de commutation (45) dans la première position de commutation (45a).
EP19166526.4A 2018-04-16 2019-04-01 Chariot de manutention doté d'un dispositif de levage Active EP3556722B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018108946.5A DE102018108946A1 (de) 2018-04-16 2018-04-16 Flurförderzeug mit einer Hubvorrichtung

Publications (2)

Publication Number Publication Date
EP3556722A1 EP3556722A1 (fr) 2019-10-23
EP3556722B1 true EP3556722B1 (fr) 2021-12-08

Family

ID=66049059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19166526.4A Active EP3556722B1 (fr) 2018-04-16 2019-04-01 Chariot de manutention doté d'un dispositif de levage

Country Status (2)

Country Link
EP (1) EP3556722B1 (fr)
DE (1) DE102018108946A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000008767A1 (it) * 2020-04-23 2021-10-23 Cnh Ind Italia Spa Disposizione idraulica per gestire il flusso di olio di ritorno in un veicolo da lavoro
DE102020131046B4 (de) 2020-11-24 2025-05-22 Buchholz Hydraulik Gmbh Hydraulisches Hubsystem
DE102021105748A1 (de) * 2021-03-10 2022-09-15 Still Gesellschaft Mit Beschränkter Haftung Verfahren und Vorrichtung zum Steuern eines hydraulischen Hubantriebs einer mobilen Arbeitsmaschine
DE102022106679A1 (de) * 2022-03-22 2023-09-28 Still Gesellschaft Mit Beschränkter Haftung Hydraulisches Steuerungssystem eines Hubantriebs eines Hubgerüstes eines Flurförderzeugs und Flurförderzeug
CN117108567B (zh) * 2023-08-09 2025-12-09 北京九天行歌航天科技有限公司 一种导弹提升机4缸加载装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512072A (en) * 1967-11-13 1970-05-12 Allis Chalmers Mfg Co Elevated load potential energy recovery in an electric truck
SE529748C2 (sv) * 2004-05-03 2007-11-13 Toyota Ind Sweden Ab Anordning vid gaffeltruck
DE102012101949A1 (de) 2012-03-08 2013-09-12 Linde Material Handling Gmbh Hubvorrichtung eines Flurförderzeugs
CN102628465A (zh) * 2012-04-17 2012-08-08 安徽合力股份有限公司 起重运输机械用能量回收式举升液压系统
DE102012024647A1 (de) * 2012-12-17 2014-06-18 Jungheinrich Aktiengesellschaft Hydraulische Hubvorrichtung für ein batteriebetriebenes Flurförderzeug
JP5835249B2 (ja) * 2013-02-27 2015-12-24 株式会社豊田自動織機 フォークリフトの油圧制御装置
DE102016103256A1 (de) * 2015-12-29 2017-06-29 Still Gmbh Flurförderzeug mit einem Hubgerüst

Also Published As

Publication number Publication date
DE102018108946A1 (de) 2019-10-17
EP3556722A1 (fr) 2019-10-23

Similar Documents

Publication Publication Date Title
EP3556722B1 (fr) Chariot de manutention doté d'un dispositif de levage
EP1987256B1 (fr) Dispositif de commande et commande pilote hydraulique
EP2113482B1 (fr) Dispositif de levage
EP2636637A1 (fr) Dispositif de levage d'un chariot de manutention
EP1574626B1 (fr) Système hydraulique de suspension passive
DE20208577U1 (de) Elektrohydraulische Hubsteuervorrichtung für Flurförerfahrzeuge
EP1743981A1 (fr) Agencement hydraulique
DE2533673C2 (de) Hydraulisches Steuersystem
EP3608286B1 (fr) Chariot industriel avec système de levage hydraulique et protection électronique du système de levage contre les dysfonctionnements
EP4321471A1 (fr) Système hydraulique pour un chariot de manutention
DE19752022A1 (de) Fahrzeug mit einem elektrischen Fahrantrieb und einer Feststellbremseinrichtung
EP3680493B1 (fr) Agencement de circuit
DE102020129275A1 (de) Mobile Arbeitsmaschine, insbesondere Flurförderzeug, mit einer hydrostatischen Lenkungseinrichtung
EP4249423B1 (fr) Système de commande hydraulique d'un entraînement de levage d'un châssis de levage d'un chariot de manutention et chariot de manutention
EP2508465A1 (fr) Chariot de manutention, en particulier chariot gerbeur doté d'un cadre de levage
EP3939930A1 (fr) Entraînement de levage hydraulique d'une machine de travail mobile
EP3936470B1 (fr) Entraînement de levage hydraulique d'une machine de travail mobile
DE10151831B4 (de) Hydraulikanlage für ein Flurförderzeug
DE102020113513A1 (de) Mobile Arbeitsmaschine, insbesondere Flurförderzeug, mit einer hydrostatischen Lenkungseinrichtung
EP4385938B1 (fr) Dispositif de soupape pour un chariot de manutention
DE102022120142A1 (de) Hydraulischer Hubantrieb einer mobilen Arbeitsmaschine
DE10303385A1 (de) Steuereinrichtung für eine Hub- und Senksteuerung
DE102019120120A1 (de) Verfahren zur Einhaltung der Knicksicherheit eines eine aus- und einfahrbare Kolbenstange aufweisenden Hubzylinders eines Hubgerüstes eines Flurförderzeugs
DE102022131132A1 (de) Hydraulisches Hubsystem für ein Flurförderzeug
EP4304974A1 (fr) Procédé et dispositif pour commander un mécanisme d'entraînement de levage hydraulique d'une machine de travail mobile

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20200326

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210830

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1453643

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211215

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502019002942

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20211208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220308

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220308

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220309

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220408

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502019002942

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220408

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

26N No opposition filed

Effective date: 20220909

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20220430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220401

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220430

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230507

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20190401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211208

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 1453643

Country of ref document: AT

Kind code of ref document: T

Effective date: 20240401

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20250417

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20250423

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20250422

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20240401