EP4304974A1 - Procédé et dispositif pour commander un mécanisme d'entraînement de levage hydraulique d'une machine de travail mobile - Google Patents

Procédé et dispositif pour commander un mécanisme d'entraînement de levage hydraulique d'une machine de travail mobile

Info

Publication number
EP4304974A1
EP4304974A1 EP22708938.0A EP22708938A EP4304974A1 EP 4304974 A1 EP4304974 A1 EP 4304974A1 EP 22708938 A EP22708938 A EP 22708938A EP 4304974 A1 EP4304974 A1 EP 4304974A1
Authority
EP
European Patent Office
Prior art keywords
lifting drive
lowering
load
lifting
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.)
Pending
Application number
EP22708938.0A
Other languages
German (de)
English (en)
Inventor
Niko Siemering
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.)
STILL GmbH
Original Assignee
STILL 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 STILL GmbH filed Critical STILL GmbH
Publication of EP4304974A1 publication Critical patent/EP4304974A1/fr
Pending legal-status Critical Current

Links

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
    • B66F9/0759—Details of operating station, e.g. seats, levers, operator platforms, cabin suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/24—Electrical devices or systems
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/005—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for preventing unintentional use of a control mechanism
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G2009/04774—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks with additional switches or sensors on the handle
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks

Definitions

  • the invention relates to a method for controlling a hydraulic lifting drive of a mobile working machine, in particular an industrial truck, for raising and lowering a load handling device, the lifting drive having a lifting cylinder device and a control valve device which are connected to a consumer line leading to the lifting cylinder device, to a consumer line leading to a container tank line and connected to a delivery line connected to a pump, wherein an operator controls the lifting operation and the lowering operation of the lifting drive by manual operation of a lifting drive operating element which is operatively connected to the control valve device.
  • the invention also relates to a device for carrying out the method.
  • a load handling device For handling loads, industrial trucks are provided with a load handling device, which is generally formed by a lifting carriage that can be raised and lowered on the mast and an attachment attached thereto.
  • 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 in lowering mode determines the lowering speed of the load-carrying device.
  • a limit of 0.6 m/s has been set for the maximum lowering speed of the load-carrying device or a load established.
  • a discharge pressure compensator in the tank line leading from the control valve device to the tank Discharge pressure compensator pending pressure is applied in the direction of a flow position and the pressure present in the consumer line in the direction of a blocking pitch. If a lifted load or an empty load-carrying means is to be lowered with such lifting drives, the control valve device is actuated into an open position in which the consumer line is connected to the container line. The discharge pressure compensator is connected in series with the control valve device. When the control valve device opens, a sink volume flow begins to flow from the lifting cylinder device to the container via the control valve device and the discharge pressure compensator, and the load-receiving means is lowered.
  • the maximum flow rate for lowering the load handling attachment is limited by the adjustment of the discharge pressure compensator.
  • the pressure in the consumer line upstream of the control valve device acts on the discharge pressure compensator on one side in the direction of a blocking position, and the spring force of the spring device and the pressure in the tank line between the control valve device and the discharge pressure compensator and thus the pressure downstream on the other side in the direction of a flow position the control valve device.
  • the sink volume flow increases until a maximum pressure drop of 4 bar, for example, occurs at the control valve device, which corresponds to the spring force of the discharge pressure compensator.
  • the outflow pressure compensator goes into the control position and moves in the direction of the blocking pitch so far that this pressure drop of, for example, 4 bar at the control valve device is kept constant.
  • control valve device In such lifting drives, the control valve device would have to open much further for this operating state of lowering with low load pressures, so that higher lowering speeds can be achieved. However, this would mean that with higher load pressures, for example load pressures above 30 bar, impermissibly high lowering speeds of the load handling equipment would occur.
  • the lowering process of the load handling device is usually controlled by a lever position of the lifting drive operating element.
  • the lifting drive operating element is deflected in a specified direction.
  • the deflection of the lift drive control is proportional to the desired lowering speed.
  • the maximum lever deflection of the lift drive control means maximum lowering speed.
  • the position of the lever of the lifting drive operating element gives a target signal to a valve slide of the control valve device.
  • the further opening of the valve slide of the control valve device means that a larger volume flow can pass and can therefore be reduced more quickly.
  • a cross-sectional opening takes place in the piston path of the valve slide of the control valve device.
  • the volume flow over a cross section depends on the pressure difference over the cross section, the so-called “driving pressure”.
  • the motive pressure depends on the load absorbed on the mast side and is maximum at nominal load and decreases with less load.
  • the opening cross section is the pressure depending on the pressure loss due to the structure of the hydraulic system. The higher the pressure loss, the lower the driving pressure.
  • the resulting speed of the load handling device thus results from a combination of the lever position of the lifting drive operating element, the opening cross section of the control valve device, the pressure loss and the driving pressure.
  • the lowering process has to be qualitatively modulated; various components in the valve block are used for this, for example the discharge pressure compensator.
  • the lowering process is controlled in particular by a simple, single lever position of the lifting drive control element.
  • a simple deflection of the lever leads to a movement of the hydraulic section, for example the lowering process of the lifting drive.
  • the control loop results from the operator, who must decide how quickly, ie with which lever position of the lifting drive operating element, the load taken up can be lowered. Maximum lowering speed with nominal load does not lead to dangerous vehicle conditions if the load capacity diagram is observed.
  • load detection which is installed on the mobile working machine and identifies and evaluates the load on the load handling device.
  • a combination of different sensors is often necessary.
  • the present invention is based on the object of designing a method of the type mentioned at the outset and a device for carrying out the method in such a way that higher lowering speeds of the load-carrying means can be achieved in a simple manner when there is no load.
  • this object is achieved according to the invention in that the operator authorizes high-speed lowering operation when there is no load on the load handling device by actuating an authorization actuating element at the same time as operating the lifting drive operating element in the lowering mode of the lifting drive, in which a lowering volume flow flowing out of the lifting drive through Cross-sectional expansion is increased in the hydraulic line path from the lifting drive to the container.
  • the lifting drive operating element is expediently designed as a deflectable lever, for example in the form of a joystick.
  • the lifting process or the lowering process is controlled with a lever deflection.
  • the authorization actuation element can be embodied as a simple button, for example. Simultaneously pressing the button during the lever deflection controlling the lowering operation can authorize high speed lowering operation.
  • the button can be mounted ergonomically, for example, on the side of the lever, so that it can be pressed with the thumb of one hand while the hand deflects the lever.
  • the invention provides that the operator only has to decide whether there is a load (regardless of weight) on the load handling device, for example on the load fork, or whether the load handling device is empty.
  • a load regardless of weight
  • the operator takes over a load detection and decides whether the load handling device is empty. If the load handling device is empty, all components are firmly connected to the mobile working machine and nothing can fall down if the vehicle is undamaged.
  • the operator takes on a decisive role in the control loop and decides whether the load handling device is empty.
  • the operator actuates the authorization actuating element at the same time as operating the lifting drive operating element in lowering mode.
  • the operator can additionally press the button for this purpose, in particular when the lever of the lifting drive operating element is fully deflected into the lowering mode. Pressing the authorization actuator, such as pressing the button, is referred to as "two-factor authorization" because in addition to the Lever deflection of the lifting drive controls in the lowering operation, the authorization actuating element must be deliberately pressed as a second factor and preferably kept pressed.
  • the operator thus confirms and authorizes the empty load handling device by actively pressing the authorization operating element, in particular by holding it down during the lowering process, and a cross-sectional expansion and thus a cross-sectional expansion in the lowering path is enabled, which enables a larger lowering volume flow and thus a higher lowering speed.
  • the two-factor authorization ensures that the cross-section expansion from the lifting drive to the container is not triggered when the load is taken up.
  • the cross-sectional enlargement is not opened and only conventional lowering is possible.
  • the operator thus acts as an additional actuator and authorizes the rapid lowering and bears responsibility for a safe lowering process. This is particularly useful because the operator knows the process, his work process and the load on the load handling device.
  • the one-dimensional lever deflection is multidimensionally expanded as a control input command.
  • the lowering volume flow flowing out of the lifting drive can be increased by expanding the cross-section in the hydraulic lowering path.
  • the flow rate of the hydraulic medium is reduced as a result of the cross-sectional enlargement, which has a quadratic influence on the pressure losses.
  • the pressure losses are reduced, which increases the lowering speed.
  • the invention results in a reduction in pressure losses and thus an improvement in the driving pressure, whereby an increased lowering speed of the load handling device is achieved during lowering operation of the load handling device.
  • the widening of the cross section is achieved by opening a bypass line leading from the consumer line to the container.
  • the bypass line is another, parallel hydraulic path of the sink path.
  • An electrically actuated, hydraulic bypass valve is expediently opened to release the bypass line.
  • the bypass line can be opened with hydraulic switching and/or proportional valves.
  • the bypass line can contain additional hydraulic control elements, for example flow or pressure control valves, for the qualitative and quantitative control of the lowering process.
  • additional hydraulic control elements for example flow or pressure control valves, for the qualitative and quantitative control of the lowering process.
  • the lowering speed can be limited to a maximum permissible lowering speed without a load.
  • the bypass line can be installed in a valve block of the control valve device, or bypass it.
  • the cross-sectional enlargement is achieved by opening an additional valve in the control valve device.
  • the sink section can be designed for a larger volume flow and an artificial narrowing of the cross section can be installed, which is opened by the two-factor authorization.
  • the valve block of the control valve device is not bypassed, but flows through it.
  • the artificial narrowing of the cross-section is achieved by the additional valve.
  • a further embodiment provides that the cross-sectional enlargement is achieved by full energization of a lowering proportional throttle valve that is partially energized during lowering operation of the lifting drive.
  • the lowering proportional throttle valve is formed, for example, by a lowering position of the control valve device. That The lowering proportional throttle valve is designed for a larger volume flow and an artificial narrowing of the cross section is provided, which is opened by the two-factor authorization. This can take place if, in normal lowering operation, the lowering proportional throttle valve is only partially and therefore partially energized and the lowering proportional throttle valve is fully energized for high-speed lowering operation.
  • An advantageous further development of the idea of the invention provides that the load pressure of the lifting drive is measured by means of a load pressure sensor and the widening of the cross section is suppressed if a predetermined load pressure is exceeded.
  • the operator can thus be assisted in recognizing the presence of a load on the load handling device.
  • the load pressure measurement is only used to block the triggering of the high-speed lowering operation if the load pressure is measured too high.
  • the operator can also be assisted by a temperature sensor.
  • the temperature of the hydraulic medium is measured by means of a temperature sensor and if a predetermined temperature is exceeded, the widening of the cross section is prevented.
  • the load pressure measurement and/or temperature measurement can take place electrically, electronically, mechanically or hydraulically.
  • the invention also relates to a device for carrying out the method with a hydraulic lifting drive of a mobile working machine, in particular an industrial truck, for raising and lowering a load handling device, the lifting drive having a lifting cylinder device and a control valve device which are connected to a consumer line leading to the lifting cylinder device, to a to a container and connected to a conveying line connected to a pump, wherein a manually operated lifting drive is used to control the lifting operation and the lowering operation of the lifting drive Operating element is provided, which is in operative connection with the control valve device.
  • the task is solved in that the operator authorizes a high-speed lowering operation when there is no load on the load-carrying device by operating an authorization operating element at the same time as operating the lifting drive operating element in the lowering mode of the lifting drive, in which a lowering volume flow flowing out of the lifting drive through Cross-sectional expansion is increased in the hydraulic line path from the lifting drive to the container.
  • the cross-sectional enlargement device comprises a bypass line leading from the consumer line to the container.
  • an electrically actuated hydraulic bypass valve that is in working connection with the actuating element is expediently arranged in the bypass line.
  • the cross-section widening device includes an additional valve in the control valve device.
  • cross-section expansion device comprises a lowering proportional throttle valve in the control valve device, which can optionally be partially and fully energized.
  • an electronic control device is preferably provided, which is in operative connection with the lifting drive operating element and with the authorization actuating element as well as with the cross-section expansion device.
  • a load pressure sensor for determining the load pressure of the lifting drive can be provided, which is operatively connected to the control device, so that the load pressure values determined can be transmitted to the control device.
  • the control device is set up to block the triggering of the high-speed lowering operation when a load pressure that exceeds a predetermined limit value is transmitted.
  • a temperature sensor for determining the temperature of the hydraulic medium can be provided as a safety device, which is operatively connected to the control device, so that the determined temperature values can be transmitted to the control device.
  • the control device is set up to block the triggering of the high-speed lowering operation when a temperature that exceeds a predetermined limit value is transmitted.
  • the industrial truck can still travel faster to the next work point because it is not permitted to travel with the load handler raised.
  • Figure 1 shows the circuit diagram of a lifting drive according to the invention
  • FIG. 2 shows the lifting drive operating element with authorization operating element.
  • FIG. 1 shows a schematic structure of a hydraulic lifting drive 1 according to the invention of a mobile work machine (not shown in detail), for example an industrial truck.
  • the elevating drive 1 has a mast 2 on which a lifting device 3 is arranged such that it can be raised and lowered.
  • the load handling device 3 consists of a lifting carriage 4 that can be moved vertically on the mast 2 and to which, for example, a load fork 5 formed by forks is attached as an attachment.
  • the mast 2 consists of a fixed mast 2a and an extension mast 2b which can be raised and lowered on the fixed mast 2a and on which the load handling device 3 can be raised and lowered.
  • the mast 2 of FIG. 1 has, for example, two lifting stages.
  • a hydraulic lifting cylinder device 10a is provided for raising and lowering the load handling device 3 relative to the extending mast 2b.
  • the lifting cylinder device 10a forms a first lifting stage (free lift).
  • a flexible traction device 6, for example a lifting chain, is provided for raising and lowering the load handling device 3. In Figure 1, it is attached at a first end to the lifting carriage 4, is guided via a deflection roller 7 on the extendable piston rod of the lifting cylinder device 10a and with a second end is attached to the extension mast 2b.
  • a hydraulic lifting cylinder device 10b is used to raise and lower the extension mast 2b relative to the stationary mast 2a.
  • the lifting cylinder device 10b forms a second lifting stage (mast lift).
  • the Lift cylinder device 10a is connected to the lift cylinder device 10b by means of a pressure medium line 11 .
  • the lifting cylinder device 10a, 10b can be actuated by means of a control valve device 12, with which the lowering operation and the lifting operation of the load handling device 3 can be controlled.
  • the control valve device 12 is designed as a proportional valve 13 which throttles in intermediate positions and has a blocking position 13a designed as a neutral position, a lifting position 13b and a lowering position 13c.
  • the control valve device 12 is connected to a delivery line 14 of a pump 15, which sucks in pressure medium from a container 17 by means of an intake line 16, to a container line 18 leading to a container 17 and to a pressure medium line 19 leading to the lifting cylinder device 10a, 10b.
  • the blocking position 13a of the control valve device 12 the connection between the consumer line 19 and the delivery line 14 and the container line 18 is blocked.
  • the delivery line 14 is connected to the consumer line 19.
  • the consumer line 19 is connected to the container line 18.
  • the lower position 13c of the control valve device 12 thus forms a lower proportional throttle valve.
  • control valve device 12 can have a separate lifting valve (lowering proportional throttle valve) for controlling the lifting operation of the load-carrying device 3 and a separate lowering valve (lowering proportional throttle valve) for controlling the lowering operation of the load-carrying device 3 .
  • the control valve device 12 can, for example, be actuated electrically by means of an electronic control device 20 .
  • a drain pressure compensator In the tank line 18 leading from the control valve device 12 to the tank 17, a drain pressure compensator, not shown in detail, can be arranged.
  • the outflow pressure compensator is preferably designed as a proportional valve that throttles in intermediate positions with a flow position and a blocking position and by a spring device and in the tank line 18 between the control valve device 12 and the discharge pressure compensator and thus the pressure present in the tank line 18 downstream of the control valve device 12 in the direction of the flow position and by the load pressure of the lifting drive 1 present in the consumer line 19 and thus the pressure present in the consumer line 19 upstream of the control valve device 12 actuated towards the locked position.
  • a cross-sectional expansion device 47 is provided according to the invention, with which the lowering volume flow can be increased in order to increase the lowering speed.
  • a bypass line 30 which leads to the container 17 and in which a bypass valve 31 is arranged is connected to the consumer line 19 .
  • the bypass valve 31 is designed as a switching valve 33 which has a blocking position 33a and a flow position 33b.
  • the blocking position 33a is designed to be leak-proof and has a non-return valve blocking in the direction of the container 17 .
  • the switching valve 33 is controlled electrically and is operatively connected to the electronic control device 20 for control purposes.
  • the switching valve 33 can be acted upon by a spring device 37 in the direction of the blocking position 33a and by means of an electrical actuating device 38, for example a switching magnet, in the direction of the flow position 33b.
  • the bypass valve 31 is designed in such a way that when the lifting drive 1 is lowering without a load on the load-carrying means 3, a lowering volume flow flowing out of the lifting drive 1 flows via the control valve device 12 and the bypass valve 31 into the container 17, and when the lifting drive 1 is lowering with a load on the load-carrying means 3 a sink volume flow flowing out of the lifting drive 1 flows out into the container 17 exclusively via the control valve device 12 .
  • a lifting drive operating element 42 which in the present exemplary embodiment comprises a deflectable lever 43, for example a joystick
  • an authorization operating element 44 which in the present exemplary embodiment has a pushable button 45 on the lever 43 includes, in operative connection.
  • the operator recognizes that there is no load on the load-carrying device 3, the operator can authorize high-speed lowering operation of the load-carrying device 3, in which the lowering volume flow flowing out of the lifting drive 1 via the control valve device 12 and the bypass valve 31 flows into the container 17.
  • a two-factor authorization is provided for this. This means that at the same time as operating the lifting drive operating element 42, i.e. at the same time as deflecting the lever 43 in the lowering direction, the operator continuously actuates the authorization operating element 44, i.e. presses the button 45 and keeps it pressed during the lowering process of the load handling device 3. The control commands of the lifting drive operating element 42 and the authorization operating element 44 triggered thereby are transmitted to the control device 20 .
  • the electronic control device 20 is designed in such a way that when the lifting drive operating element 42 is operated and the authorization actuating element 44 is operated simultaneously in lowering operation without load, the control valve device 12 is actuated into the lowering position 13c and the switching valve 33 is actuated into the through-flow position 33b for high-speed lowering operation . In contrast, in lowering operation under load, only the control valve device 12 is actuated into the lowering position 13c, but the switching valve 33 is not actuated and is actuated into the blocking position 33a.
  • control device 20 is operatively connected to a load pressure sensor 40 that detects the load pressure of the lifting drive 1 in the consumer line 19 and/or a temperature sensor 41 that measures the temperature of the hydraulic medium.
  • the control device 20 is set up to trigger the transmission of a load pressure that exceeds a predetermined limit value and / or a temperature that exceeds a predetermined limit value to block high-speed sink operation. This represents an additional security measure.
  • the control valve device 12 is arranged in a directional control valve block 70 in FIG.
  • Further control valves (not shown) of a working hydraulic system of the mobile working machine can also be arranged in the directional control valve block 70, for example a control valve of a tilting drive for tilting the mast 2 and a control valve for controlling an additional consumer, for example a sideshift of the load handling device 3.
  • the bypass valve 31, which includes the switching valve 33 in FIG. 1, is arranged in a separate valve housing 71. This enables the bypass valve 31 and the bypass line 30 to be retrofitted to existing lifting drives 1 in a simple manner.
  • the volume flow in the bypass line 30 during the high-speed lowering operation thus bypasses the directional control valve block 70, as a result of which its flow losses are avoided.
  • the bypass valve 31 is not active.
  • the switching valve 33 is not controlled by the control device 20 and is in the blocking position 33a, so that the lowering operation of the lifting drive 1 takes place exclusively via the control valve device 12 actuated into the lowering position 13c.
  • no sink volume flow flows from the lifting cylinder device 10a, 10b to the container 17 via the bypass valve 31 .
  • the bypass valve 31 is active for the high-speed lowering operation.
  • the switching valve 33 is controlled by the control device 20 in the flow positions 33b.
  • the lowering operation of the lifting drive 1 thus takes place via the control valve device 12 actuated into the lowering position 13c and additionally via the open bypass valve 31.
  • About the switching valve 33 actuated in the through-flow position 33b thus results in an additional sink volume flow, which flows from the lifting cylinder device 10a, 10b to the container 17. This additional lowering volume flow via the bypass valve 30 enables higher lowering speeds without a load.
  • load pressure sensor 40 detects a load pressure above the limit value and/or temperature sensor 41 detects a temperature of the hydraulic medium above the limit value
  • the control device 20 blocks the triggering of the high-speed lowering operation and the switching valve 33 is not driven into the flow position 33b, so that the lowering operation takes place exclusively via the control valve device 12 actuated into the lowering position 13c.
  • FIG. 2 shows the lifting drive operating element 42 with the authorization actuating element 44 from FIG. 1 in detail.
  • the lifting drive operating element 42 is designed as a deflectable lever 43, for example a joystick
  • the authorization operating element 44 is designed as a button 45, which is arranged on the side of the lever 43.
  • the lowering process is controlled by deflecting the lever 43 with the operator's hand in the direction of the arrow 46 . If the operator recognizes that there is no load on the load handling device 3, he can activate the high-speed lowering operation with a two-factor authorization. For this purpose, the operator simultaneously presses the button 45 with the thumb of the hand to deflect the lever 43 in the direction of the arrow 46 and keeps the button 45 pressed during the entire lowering process.

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

Abstract

L'invention concerne un procédé pour la commande d'un mécanisme d'entraînement de levage hydraulique (1) d'une machine de travail mobile, en particulier d'un chariot de manutention, pour le levage et l'abaissement d'un moyen de réception de charge (3). Le mécanisme d'entraînement de levage (1) possède un dispositif à vérin de levage (10a, 10b) et un dispositif à vanne de commande (12), lequel est raccordé à une conduite de consommateur (19) menant au dispositif à vérin de levage (10a, 10b), à une conduite de récipient (18) menant à un récipient (17) et à une conduite d'alimentation (14) reliée à une pompe (15). Un opérateur commande l'opération de levage et l'opération d'abaissement du mécanisme d'entraînement de levage (1) en actionnant manuellement un élément de commande de mécanisme d'entraînement de levage (42) qui est relié fonctionnellement au dispositif à vanne de commande (12). Selon l'invention, en l'absence d'une charge sur le moyen de réception de charge (3), l'opérateur, en actionnant un élément d'actionnement d'autorisation (44) simultanément au fonctionnement de l'élément d'actionnement du mécanisme d'entraînement de levage (42) dans l'opération d'abaissement du mécanisme d'entraînement de levage (1), autorise une opération d'abaissement à grande vitesse dans laquelle un débit volumétrique nécessaire à l'abaissement et à l'écoulement hors du mécanisme d'entraînement de levage (1) est augmentée par l'augmentation de la section transversale au moyen d'un dispositif d'augmentation de section transversale (47) dans le trajet de la conduite hydraulique du mécanisme d'entraînement de levage (1) au récipient (17). L'invention concerne également un dispositif pour mettre en œuvre le procédé.
EP22708938.0A 2021-03-10 2022-03-01 Procédé et dispositif pour commander un mécanisme d'entraînement de levage hydraulique d'une machine de travail mobile Pending EP4304974A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021105748.5A DE102021105748A1 (de) 2021-03-10 2021-03-10 Verfahren und Vorrichtung zum Steuern eines hydraulischen Hubantriebs einer mobilen Arbeitsmaschine
PCT/EP2022/055062 WO2022189197A1 (fr) 2021-03-10 2022-03-01 Procédé et dispositif pour commander un mécanisme d'entraînement de levage hydraulique d'une machine de travail mobile

Publications (1)

Publication Number Publication Date
EP4304974A1 true EP4304974A1 (fr) 2024-01-17

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EP22708938.0A Pending EP4304974A1 (fr) 2021-03-10 2022-03-01 Procédé et dispositif pour commander un mécanisme d'entraînement de levage hydraulique d'une machine de travail mobile

Country Status (4)

Country Link
EP (1) EP4304974A1 (fr)
CN (1) CN116940517A (fr)
DE (1) DE102021105748A1 (fr)
WO (1) WO2022189197A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2546352B2 (ja) * 1988-09-19 1996-10-23 株式会社豊田自動織機製作所 産業車両における荷役用油圧制御装置
JPH0776499A (ja) * 1993-09-10 1995-03-20 Mitsubishi Heavy Ind Ltd フォークリフトの制御装置
JPH08290900A (ja) * 1995-04-25 1996-11-05 Komatsu Forklift Co Ltd フォークリフトトラックの荷役制御装置
JP3299457B2 (ja) * 1996-11-08 2002-07-08 日本輸送機株式会社 ピッキングリフトの昇降用作動装置
JP4072885B2 (ja) * 2001-02-19 2008-04-09 コマツユーティリティ株式会社 バッテリフォークリフトの作業機制御装置
JP2004035199A (ja) * 2002-07-04 2004-02-05 Aichi Corp 高所作業車の制御装置
DE102012107256B4 (de) * 2012-05-07 2023-08-31 Buchholz Hydraulik Gmbh Hydraulischer Hubantrieb einer mobilen Arbeitsmaschine
DE102018108946A1 (de) * 2018-04-16 2019-10-17 Linde Material Handling Gmbh Flurförderzeug mit einer Hubvorrichtung

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WO2022189197A1 (fr) 2022-09-15
DE102021105748A1 (de) 2022-09-15
CN116940517A (zh) 2023-10-24

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