EP3260410A1 - A lifting vehicle configured for attaching high-power hydraulic implements - Google Patents

A lifting vehicle configured for attaching high-power hydraulic implements Download PDF

Info

Publication number
EP3260410A1
EP3260410A1 EP17175450.0A EP17175450A EP3260410A1 EP 3260410 A1 EP3260410 A1 EP 3260410A1 EP 17175450 A EP17175450 A EP 17175450A EP 3260410 A1 EP3260410 A1 EP 3260410A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
implement
mode
diverter
operator
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.)
Withdrawn
Application number
EP17175450.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Mr. Amilcare MERLO
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.)
Merlo Project Srl
Original Assignee
Merlo Project Srl
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 Merlo Project Srl filed Critical Merlo Project Srl
Publication of EP3260410A1 publication Critical patent/EP3260410A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/065—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems

Definitions

  • the present invention relates to a lifting vehicle provided with a lifting arm configured for attaching an implement that requires high hydraulic power, such as vibrating heads for shaking olive trees or other fruit plants.
  • Lifting vehicles with telescopic lifting arms are usually equipped with a hydrostatic transmission, with a thermal engine that drives a hydraulic pump.
  • the hydraulic pump is connected to a hydraulic power line that drives a traction hydraulic motor, connected through a gearbox to a mechanical transmission that drives the wheels of the vehicle.
  • a hydraulic diverter is assembled on the hydraulic power line, which connects the hydraulic pump to the traction hydraulic motor.
  • the hydraulic diverter has two operative positions selectable by the operator. Depending on the position of the hydraulic diverter, the vehicle is placed into a traction mode in which the hydraulic diverter connects the hydraulic power line to the traction hydraulic motor, or into an implement operating mode in which the hydraulic diverter connects the hydraulic power line to the hydraulic actuator of the implement.
  • the implement in the implement operating mode, the implement is controlled by the same controls that -in the traction mode- are used to control the traction of the vehicle.
  • the same three-position selector is used to set the forward travel-direction, reverse travel-direction or neutral mode, when the hydraulic diverter is set to traction mode, and to adjust the hydraulic power of the implement, the vehicle accelerator is used.
  • vehicles of this type are affected by safety issues. For example, if the operator believes that the hydraulic diverter has been set to the implement control mode, while in fact the hydraulic diverter has remained in the traction mode, when the operator drives the commands, believing that the implement is being moved, he actually causes an involuntary movement of the vehicle. Conversely, the operator may inadvertently cause the movement of the implement instead of controlling the vehicle movements.
  • the risk of mismanagement derives from the fact that the same commands used to control the traction of the vehicle are used to command the implement.
  • the hydraulic diverter selects the destination utility of the hydraulic power (vehicle traction system or implement actuator) but the commands for the two operating modes are the same.
  • the object of the present invention is to provide a lifting vehicle configured to operate with high-power hydraulic implements, which overcomes the problems of the prior art.
  • this object is achieved by a lifting vehicle having the characteristics forming the subject of claim 1.
  • numeral 10 indicates a lifting vehicle comprising a frame 12, a pair of front wheels 14, and a pair of rear wheels 16.
  • the vehicle 10 comprises a telescopic lifting arm 18 articulated to the frame 12 and controlled by a lifting cylinder 20.
  • the arm 18 is provided at its distal end with an attachment 22 through which various types of implements can be connected to the arm 18.
  • the vehicle 10 is configured to be able to operate with implements 24 that absorbs high hydraulic power, such as vibrating heads for shaking olive trees or other fruit plants.
  • the vehicle 10 comprises a thermal engine 30 that operates a hydraulic pump 32.
  • the hydraulic pump 32 is connected to a hydraulic power line 34.
  • the vehicle 10 comprises a hydraulic diverter 36 that selectively connects the hydraulic power line 34 to a traction hydraulic motor 38 or to a hydraulic actuator of the implement 40.
  • the traction hydraulic motor 38 is connected, through a gearbox 42, to a mechanical transmission 44 that drives the wheels of the vehicle.
  • the hydraulic actuator of the implement 40 can be a rotary actuator (hydraulic motor) or a linear actuator (hydraulic cylinder).
  • the hydraulic diverter 36 has two operating positions relative to two operating modes of the vehicle:
  • the operating modes of the hydraulic diverter 36 are set by an electronic control unit 46.
  • the electronic control unit 46 receives a signal from an operating mode selector 48, operated by the operator to switch the operating mode of the vehicle between the traction mode and the implement use mode.
  • the electronic control unit 46 also receives control signals coming from a travel-direction selector 50.
  • the travel-direction selector 50 is a three-position selector that -in traction mode- allows selection between forward travel-direction, reverse travel-direction, or neutral mode.
  • the electronic control unit receives a control signal for the accelerator 52 by means of which the user controls the rotational speed of the thermal engine 30.
  • the electronic control unit 46 receives signals from a control device of the implement 54, by means of which the operator controls the hydraulic actuator of the implement 40 in the implement use mode.
  • the electronic control unit 46 also receives a signal from a sensor 56 in the seat, which indicates the presence of the operator at the control station and a signal coming from a speed sensor 58 of the vehicle arranged on the gearbox 42.
  • the electronic control unit 46 receives a signal from an operating mode sensor 60, which controls the position of the hydraulic diverter 36 and the signal of a selector 62, which sets the parking brake of the vehicle.
  • the electronic control unit 46 also receives signals from pressure sensors 64 that detect the pressure in the hydraulic power line 34.
  • the electronic control unit 46 controls the hydraulic pump 32 as a function of the signals coming from the accelerator control 52.
  • the electronic control unit 46 controls warning lights 66 located on the instrument panel of the vehicle, to indicate the operating mode that has been set to the operator.
  • the electronic control unit 46 sets the operating mode of the vehicle between the traction mode and the implement use mode by selecting the operative status of the diverter 36.
  • the electronic control unit 46 sets the hydraulic diverter 36 to the implement operating mode when:
  • the electronic control unit 46 sets the hydraulic diverter 36 to the implement operating mode.
  • the high-power hydraulic power supply is stopped.
  • the operator controls the implement actuator 40 via the control device 54 of the implement, which is separate and independent from the travel-direction selector 50 that controls the travel-direction of the vehicle in traction mode.
  • the operator To use the high-power hydraulic implement, the operator must, therefore, stop the vehicle and, while remaining seated on the seat so that the electronic control unit 46 recognizes his presence, he controls the activation of the implement use mode by means of the operating mode selector 48. At this point, the operator can control the activation of the implement by means of the dedicated control device 54, and accelerate the thermal engine by means of the accelerator 52 to provide the required power.
  • the electronic control unit 46 controls the functionality of the system by means of the sensors and, in the event of anomalies or controls that are not allowed by the operator, immediately stops the oil flow. In particular, in addition to the presence of the on-board operator, the electronic control unit 46 verifies that all the controls are consistent and that no unwanted movements of the vehicle wheels occur during the activation of the implement.
  • the operator wishes to control the movement of the machine, it is sufficient that, while still sitting on the seat, he selects the direction of travel by means of the travel-direction selector 50 and accelerates the thermal engine by means of the accelerator 52 until the required speed is reached.
  • the electronic control unit 46 configures the system into the traction operating mode and inhibits the high-power hydraulic power supply of the implement 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP17175450.0A 2016-06-16 2017-06-12 A lifting vehicle configured for attaching high-power hydraulic implements Withdrawn EP3260410A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUA2016A004446A ITUA20164446A1 (it) 2016-06-16 2016-06-16 Veicolo sollevatore configurato per l'attacco di attrezzature ad alta potenza oleodinamica

Publications (1)

Publication Number Publication Date
EP3260410A1 true EP3260410A1 (en) 2017-12-27

Family

ID=57184695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17175450.0A Withdrawn EP3260410A1 (en) 2016-06-16 2017-06-12 A lifting vehicle configured for attaching high-power hydraulic implements

Country Status (2)

Country Link
EP (1) EP3260410A1 (it)
IT (1) ITUA20164446A1 (it)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1297216A (it) * 1970-03-02 1972-11-22
EP0122807A1 (en) * 1983-04-18 1984-10-24 Clark Equipment Company Hydraulic system with proportional control
US5247787A (en) * 1992-01-22 1993-09-28 Snell Lloyd D Multi-purpose orchard shaker/power plant
US6182788B1 (en) * 1996-08-02 2001-02-06 Holt Industries Pty Ltd. Elevating work platform

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1297216A (it) * 1970-03-02 1972-11-22
EP0122807A1 (en) * 1983-04-18 1984-10-24 Clark Equipment Company Hydraulic system with proportional control
US5247787A (en) * 1992-01-22 1993-09-28 Snell Lloyd D Multi-purpose orchard shaker/power plant
US6182788B1 (en) * 1996-08-02 2001-02-06 Holt Industries Pty Ltd. Elevating work platform

Also Published As

Publication number Publication date
ITUA20164446A1 (it) 2017-12-16

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