Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
  • B66F9/075—Constructional features or details
  • B66F9/20—Means for actuating or controlling masts, platforms, or forks
  • B66F9/22—Hydraulic devices or systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
  • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
  • B66F9/065—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 non-masted
• • 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
  • B66F9/065—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 non-masted
  • B66F9/0655—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 non-masted with a telescopic boom
• • 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
  • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
• • 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
  • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
  • F15B2011/0243—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits the regenerative circuit being activated or deactivated automatically
• • 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
  • F15B2211/30—Directional control
  • F15B2211/305—Directional control characterised by the type of valves
  • F15B2211/30505—Non-return valves, i.e. check valves
  • F15B2211/30515—Load holding 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
  • F15B2211/30—Directional control
  • F15B2211/305—Directional control characterised by the type of valves
  • F15B2211/3056—Assemblies of multiple valves
  • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
  • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
• • 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
  • F15B2211/30—Directional control
  • F15B2211/32—Directional control characterised by the type of actuation
  • F15B2211/329—Directional 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
  • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
  • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member 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
  • F15B2211/50—Pressure control
  • F15B2211/505—Pressure control characterised by the type of pressure control means
  • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
  • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back 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
  • F15B2211/50—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
  • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
  • F15B2211/75—Control of speed of the output member

Definitions

• the present invention relates to a load handling machine
• a load handling machine comprising a load handling device comprising at least:
• a hydraulic cylinder for lifting the or at least one of the load handling devices, said lifting cylinder comprising a lifting chamber and a lowering chamber,
• a source of hydraulic fluid comprising at least one hydraulic fluid distribution system and a reservoir
• the first fluidic connection comprising a safety valve open in the direction of fluid circulation from the source of hydraulic fluid towards the lifting chamber and normally closed in the direction of circulation from the lifting chamber towards the source of hydraulic fluid to retain a driving load .
• Load handling machines of the aforementioned type are known.
• An example of such a device is described in patent US2004/00221717.
• the lifting speed of the load handling device does not vary according to the load. This has the consequence of not being able to optimize cycle times for work consisting of lifting the load handling unit empty to recover a load placed at a height.
• Other load handling machines such as those described in documents DE 1406784, US 4953723 and EP 0172524 are also known.
• An object of the invention is to provide a handling machine whose design of the load handling device makes it possible to increase the lifting speed of the empty load handling member.
• the subject of the invention is a load handling machine comprising a load handling device comprising at least:
• a hydraulic cylinder for lifting the or at least one of the load handling devices, said lifting cylinder comprising a lifting chamber and a lowering chamber,
• a source of hydraulic fluid comprising at least one hydraulic fluid distribution system and a reservoir
• the first fluid connection comprising a safety valve open in the direction of fluid circulation from the source of hydraulic fluid to the lifting chamber and normally closed in the direction of circulation from the lifting chamber to the source of hydraulic fluid
• the load handling device comprises a pressure-sensitive valve arranged on the second fluidic connection, this valve being configured to pass from the closed position to the open position according to the pressure prevailing on the portion of the first fluidic connection s' extending between the check valve and the source of hydraulic fluid
• the load handling device further comprising a unidirectional and closable fluid circulation line connecting the first and second fluidic connections for a loop circulation of fluid from the lowering chamber towards the lifting chamber in the open state of said line, the closure member of said line being configured to move between an open position and a closed position depending on the pressure prevailing on the portion of the second fluidic connection between the valve and the source of hydraulic fluid.
• the pressure-sensitive valve arranged on the second fluid connection is a proportional valve.
• the proportional valve allows smooth lifting with load.
• the pressure-sensitive valve arranged on the second fluidic connection is configured to pass from the closed position to the open position when the pressure prevailing on the portion of the first fluidic connection s extending between the safety valve and the source of fluid is greater than a predetermined value.
• the closure member of the unidirectional fluid circulation line is configured to pass from the open position to the closed position when the pressure prevailing on the portion of the second connection fluidic extending between the valve and the source of hydraulic fluid is greater than a predetermined value.
• This configuration corresponds to a lowering command.
• the closure member of the unidirectional fluid circulation line is in the open position.
• the unidirectional fluid circulation line is, for fluid circulation only from the lowering chamber to the lifting chamber, equipped with a non-return valve.
• the safety valve is a pressure-sensitive valve configured to pass from the closed position to the open position depending on the pressure prevailing on the second fluid connection.
• the safety valve is a balancing valve or a controlled non-return valve.
• FIG. 1 shows a schematic view of a machine equipped with a load handling device according to the invention
• FIG. 2 shows a partial schematic view of the handling device during a lifting phase without load or with a load determined according to the kinematics of the machine
• FIG. 3 shows a partial schematic view of the handling device during a lifting phase with load
• FIG. 4 represents a partial schematic view of the handling device during a descent phase with or without load.
• the invention relates to a load handling machine 1 which can take the form of a construction machine, an agricultural work machine or other.
• This machine 1 comprises, for example, as in the example shown, a rolling frame equipped with a cockpit of the machine and a powertrain for driving the machine on the ground.
• the load handling machine 1 further comprises a load handling device 2 .
• This load handling device 2 comprises a load handling member 3 which can have a large number of shapes.
• the load handling member 3 comprises an arm carried by the frame. This arm is provided at its end with a load gripping member made here in the form of a fork which could similarly be in the form of a bucket or other.
• the arm is a pivoting arm mounted to pivot around a so-called horizontal axis orthogonal to the longitudinal axis of the arm and parallel to a horizontal plane of support on the ground of the machine 1 in the positioned state of the machine 1 on said plan.
• This arm is pivotally movable between a low position and a high position using an actuator made here in the form of a jack.
• This hydraulic cylinder for actuating the arm and, in particular, for lifting the arm, arranged between the arm and the rolling frame, is shown at 4 in the figures.
• This arm lifting cylinder 4 is controlled using a control device, such as a joystick (not shown), placed inside the cabin. piloting in a manner known per se.
• This lifting cylinder 4 comprises a lifting chamber 5, that is to say a chamber which, when supplied with fluid, generates a pivoting movement of the load handling member 3 in the direction of a lifting of the handling member 3, and a lowering chamber 6, that is to say a chamber which, when supplied with pressurized fluid, generates a pivoting movement of the load handling member 3 in the direction of a lowering of the load handling member 3.
• the lifting chamber 5 is arranged on the bottom side of the body of the jack 4 for lifting, while the lowering chamber 6 is arranged on the rod side of the jack 4 for lifting.
• the device 2 for handling the load comprises a source 7 of hydraulic fluid.
• This source 7 of hydraulic fluid comprises at least one hydraulic fluid distribution system 73 such as a distributor, a reservoir 72 and, in the example shown, a pump 71.
• the handling machine 1 comprises a unit piloting of the system 73 of distribution and of the pump 71 according to the manual actuation of the member 4 for controlling the cylinder 4 of lifting by the driver of the machine.
• Pump 71 is a hydraulic pump.
• the load handling device 2 further comprises a first fluidic connection 8 for connecting the lifting chamber 5 of the lifting cylinder 4 with said source 7 of hydraulic fluid, and a second fluidic connection 9 for connecting the chamber of lowering 6 of the lifting cylinder 4 with said source 4 of hydraulic fluid.
• first and second fluidic connections are each time produced using conduits as illustrated in FIG. 2.
• These first and second fluidic connections can be alternately supplied with pressurized fluid using the pump 71 and the system 73 for distributing hydraulic fluid from the source 7 of hydraulic fluid.
• the first fluid connection 8 comprises a pressure-sensitive safety valve 10 .
• This safety valve 10 is always open in the direction of fluid circulation from the source 7 of hydraulic fluid to the lifting chamber.
• This safety valve 10 is normally closed in the direction of circulation of the fluid from the lifting chamber 5 towards the source 7 of fluid hydraulics to hold a driving load.
• This safety valve 10 which is sensitive to the pressure is configured to move from the closed position to the open position depending on the pressure prevailing on the second fluidic connection 9 on the portion of the second fluidic connection 9 extending between the chamber lowering and a valve which will be described below.
• This safety valve 10 can be a balancing valve or a controlled non-return valve.
• the second fluid connection 9 comprises, in turn, a valve 11 sensitive to pressure.
• This valve 11 is configured to pass from the closed position to the open position depending on the pressure prevailing on the portion of the first fluid connection 8 extending between the safety valve 10 and the hydraulic source 7 .
• this valve 11 is a proportional valve configured to pass from the closed position to the open position when the pressure prevailing on the portion of the first fluid connection 8 extending between the safety valve 10 and the source 7 of fluid is greater than a predetermined value.
• this valve 11 is a proportional 2/2 valve.
• the load handling device 2 further comprises a fluid circulation line 12 connecting the first and second connections 8, 9 fluidic.
• This fluid circulation line 12 connects the portion of the second fluid connection 9 extending between the lowering chamber and the valve 11 with the portion of the first fluid connection 8 extending between the lifting chamber and the valve 10 of security.
• This line 12 of unidirectional fluid circulation imposes a circulation of fluid inside said line exclusively from the lowering chamber 6 of the jack 4 for lifting to the lifting chamber 5 of said jack 4 for lifting. Oncoming traffic is prevented.
• the line 12 of unidirectional fluid circulation is equipped with a non-return valve 14.
• This unidirectional fluid circulation line 12 is a line that can be closed using at least one closure member 13 fitted to said line 12.
• This shutter member 13 is a member mounted movable between an open position and a closed position and configured to move from the open position to the closed position depending on the pressure prevailing on the portion of the second fluid connection 9 between the proportional valve 11 and the source 7 of hydraulic fluid.
• the member 13 for closing the line 12 of unidirectional fluid circulation is configured to pass from the open position to the closed position when the pressure prevailing on the portion of the second fluid connection 9 extending between the valve 11 proportional and the source 7 of hydraulic fluid is greater than a predetermined value.
• This configuration corresponds to the control by the operator of a lowering movement of the load handling member.
• this shutter member 13 is an all-or-nothing valve and the line 12 of unidirectional fluid circulation is in the form of a fluid pipe connecting the first and second fluid connections.
• the first and second fluid connections 8 and 9 as well as the unidirectional fluid circulation line 12 form, with the source 7 of hydraulic fluid, the hydraulic control circuit of the lifting jack 4, this control circuit being designated at 15 at the figure 2.
• the driver of the machine commands, using the control member of the cylinder 4 for lifting, the lifting of the member 3 for handling the load.
• the pump 71 and the distributor 73 of the source 7 of hydraulic fluid therefore supply the first fluid connection 8 with fluid to cause the rod of the lifting cylinder 4 to come out by filling the lifting chamber 5 with fluid.
• the proportional valve 11 of the second fluid connection 9 remains closed as long as the pressure prevailing on the portion of the first fluid connection 8 extending between the safety valve 10 and the hydraulic source 7 is less than a predetermined pressure value.
• the flow of fluid leaving the lowering chamber 6 of the cylinder 4 lifting can not return to the source 7 of fluid.
• the fluid then passes through the line 12 of unidirectional fluid circulation to be added to the flow of fluid supplying the lifting chamber 5 and coming from the source 7 of hydraulic fluid.
• the lifting speed of the load increases.

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

Applications Claiming Priority (2)

Publications (3)

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• 2020
  • 2020-07-07 FR FR2007174A patent/FR3112337B1/fr active Active
• 2021
  • 2021-06-18 US US18/004,268 patent/US12540062B2/en active Active
  • 2021-06-18 WO PCT/FR2021/051105 patent/WO2022008813A1/fr not_active Ceased
  • 2021-06-18 EP EP21740135.5A patent/EP4178903B1/de active Active

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