EP3816095A1 - Machine motrice dotée d'un cadre et d'une flèche pivotante - Google Patents

Machine motrice dotée d'un cadre et d'une flèche pivotante Download PDF

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Publication number
EP3816095A1
EP3816095A1 EP20203690.1A EP20203690A EP3816095A1 EP 3816095 A1 EP3816095 A1 EP 3816095A1 EP 20203690 A EP20203690 A EP 20203690A EP 3816095 A1 EP3816095 A1 EP 3816095A1
Authority
EP
European Patent Office
Prior art keywords
load
valve
cylinder
tilting
boom
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
EP20203690.1A
Other languages
German (de)
English (en)
Inventor
Andreas Wizgall
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.)
Kramer Werke GmbH
Original Assignee
Kramer Werke 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 Kramer Werke GmbH filed Critical Kramer Werke GmbH
Publication of EP3816095A1 publication Critical patent/EP3816095A1/fr
Pending 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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/283—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a single arm pivoted directly on the chassis
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels

Definitions

  • the invention relates to an engine, in particular a motor vehicle, with a frame and a boom that can be pivoted about a first pivot axis with respect to the frame according to the preamble of claim 1.
  • Telescopic handlers have been in use for years, e.g. in civil engineering, in recycling and waste management, in gardening and landscaping as well as in agriculture.
  • other tools such as load hooks, concrete buckets, sweeping machines, work platforms, winches and grabs can also be used.
  • Loading systems of telescopic handlers usually have a lifting arm with at least one extension stage, which is usually pivotably mounted on the rear of the vehicle.
  • the lifting movement is carried out by a lifting cylinder that is controlled or actuated by the driver using a directional valve.
  • a seat-tight load-holding valve is installed directly on the lifting cylinder and secures the load against uncontrolled lowering due to leaks at the directional control valve or in the event of a line break.
  • the load-holding valve is controlled by building up pressure.
  • the inclination of the tool carrier or a load pick-up is varied by means of a tilt cylinder.
  • the tilting cylinder is operated by the driver or supplied with hydraulic energy via a directional control valve and the load is secured by a load-holding valve.
  • the tool carrier is pivoted on a circular path around the pivot point of the lifting arm.
  • a compensation cylinder is attached to the lifting arm in order to compensate for the angular change in the tool alignment. This cylinder is pulled apart during the lifting movement. The amount of oil displaced in the process is fed to the tilt cylinder, whereby its spatial orientation or that of the tool is kept approximately constant.
  • the disadvantage here is that the mechanical coupling of the lifting cylinder and the compensation cylinder by means of the lifting arm influences the lifting cylinder or the other hydraulic circuit or the pressure conditions of the lifting cylinder are changed if the tool carrier is tilted, for example. Under certain conditions, the lifting arm could even be raised in an uncontrolled manner, which represents a safety risk.
  • the compensation cylinder or the pressure conditions of the circuit with the tilt cylinder and the compensation cylinder can also be influenced or changed.
  • an overridable differential pressure control valve is arranged between the directional control valve for actuating the tilt cylinder and the compensation cylinder in order to eliminate the corresponding risks.
  • the object of the invention is to propose an engine, in particular a motor vehicle, which realizes an improved or more efficient mode of operation compared to the prior art, in particular has an improved pressurization or energy utilization of the hydraulic system.
  • an engine according to the invention in particular a motor vehicle, is characterized in that at least one second control line is provided for controlling / actuating the first actuator and / or that at least the first connecting line comprises at least one second, controllable actuator.
  • the hydraulic tilt compensation system can advantageously be influenced or controlled / controlled.
  • the first actuator and / or the first connecting line can be opened directly by means of the second control line and / or by means of the second, controllable actuator in addition to the previous control options, or the flow of the hydraulic fluid / oil can be activated.
  • disadvantageous pressure changes or a disadvantageous pressure increase in the hydraulic lifting system or the lifting cylinder circuit can be effectively prevented or limited.
  • the invention opens up a wide variety of control options, so that the power machine or the boom / lifting arm can be operated in a more flexible and optimized manner. In this way, high safety requirements can be met and the hydraulic system (s) can also be improved.
  • the first connecting line or the first actuator before or at the start of the actuation of the lifting cylinder, can already be opened / released or actuated / controlled so that no disadvantageous pressure conditions in the hydraulic tilt compensation system and / or hydraulic lifting System are in place.
  • the first connection line can be "switched freely" before or at the same time as the actuation of the lifting cylinder, so that in certain operating conditions the compensation cylinder is no longer adjusted by means of the lifting cylinder, but rather the compensation cylinder is freely moving or even subjected to hydraulic pressure and thus the Supported lifting movement of the boom.
  • the invention was able to determine a 10 to 15% increase in the payload.
  • the second control line is advantageously arranged between the swivel actuation unit and the first actuator. This ensures that the first actuator is advantageously activated or actuated immediately upon actuation of the pivot actuation unit or the lift valve by the operator. This can not only be implemented structurally or in terms of circuitry without great effort, but also has a high level of operational reliability.
  • the second, controllable actuator hydraulically parallel to the first, controllable actuator, with the first, controllable actuator and the second, controllable actuator between a first branch point and a second branch point of the first Connecting line are arranged.
  • the second, controllable actuator can be actuated / controlled separately or independently / in addition to the first, controllable actuator, so that the first connecting line can advantageously be opened or switched free.
  • the first connecting line can be “switched free”, even before or at the same time as the actuation of the lifting cylinder.
  • An (electrical and / or electronic) actuation sensor is advantageously provided for detecting the actuation / adjustment of the lifting cylinder and / or the swivel actuation unit / valve and / or the boom.
  • the actuation sensor is preferably arranged on the swivel actuation unit and / or on the lifting cylinder and / or on the boom.
  • an advantageous (electrical) (control) signal can be generated, which is transmitted to / for the first / second actuator, for example, by means of an electrical line or wirelessly by means of a transmitter and receiver.
  • an opening or activation of the first connecting line according to the invention can also be realized in this way in an advantageous manner.
  • the first connecting line comprises at least one first load holding unit and / or a first load holding valve, with at least one third control line preferably being provided between the second connecting line and the first load holding unit and / or the first load holding valve.
  • the fluid flow or the oil column is prevented from tearing off.
  • the inadmissible lowering of the load in the holding position is prevented.
  • a pipe rupture safety device is integrated through the check valves in the load holding valves. This prevents the load from lowering if a hose line or a hydraulic pipeline bursts or tears.
  • At least one second load holding unit and / or a second load holding valve is arranged and / or comprised between the tilt actuation unit and the tilt stroke cylinder and / or the compensation stroke cylinder and / or the first, controllable actuator and / or the second, controllable actuator the second connecting line has at least one second differential pressure control unit and / or a second differential pressure control valve, wherein the second load holding unit is preferably designed as a check valve arrangement and / or comprises at least two second load holding valves.
  • the second load holding unit is preferably designed as a check valve arrangement and / or comprises at least two second load holding valves.
  • the first controllable actuator is designed as a first differential pressure control unit and / or first differential pressure control valve and / or first pressure limiting unit and / or first pressure limiting valve and / or pressure reducing valve.
  • the pressure that is built up at the connection of the tilt actuation unit can be reduced in an advantageous manner, down to a value that is low enough that the unloaded loading system cannot be lifted by the compensation lift cylinder alone.
  • the compensation stroke cylinder is pulled apart by an active stroke movement by the tilt stroke cylinder, hydraulic fluid / oil is displaced via the rod side of the compensation stroke cylinder.
  • the pressure that is built up starting from the connection of the cylinder controls both the load holding valve and the differential pressure control valve. During an active lifting movement, starting from the loading installation, an unimpeded volume compensation between the tilting lift cylinder and the compensation lift cylinder is thus made possible according to the invention.
  • At least one third load holding unit and / or a third load holding valve is advantageously arranged between the swivel actuation unit and the swivel lift cylinder.
  • the swivel stroke cylinder can also be secured in an advantageous manner against impermissible lowering in the event of damage or a line break in the swivel stroke cylinder circuit.
  • the telescopic handler 1 includes, inter alia, a boom 1.1 or a telescopic lifting arm 1.1, which can be adjusted / pivoted about a first pivot axis 1.8 with the aid of a pivot cylinder 2.1 or lifting cylinder 2.1 in relation to a vehicle frame 1.6.
  • the length adjustment can be implemented in a known manner in one or more stages and is not shown or carried out here in more detail.
  • the telescopic loader 1 also has, in a known manner, a driver's cab 1.7 in which one or two or more control elements for driving and for operating the hydraulic system are advantageously present.
  • wheels are provided in a known manner, which are preferably all drivable by means of a drive motor and / or steerable by the driver.
  • a load receptacle 1.3 or tool carrier 1.3 is arranged so as to be pivotable about a second pivot axis 1.9.
  • a load 1.4 or a tool 1.4 is arranged at an arm end 1.5, the tool carrier 1.3 being able to be adjusted / pivoted in relation to the arm end 1.5 with the aid of a tilting stroke cylinder 3.1 or tilting cylinder 3.1.
  • the tilt cylinder 3.1 is hydraulically connected to a compensation cylinder 4.1 via a first connecting line I and a second connecting line II, i.e. hydraulic fluid / oil can be exchanged via the two connecting lines I and II or they are integrated in a common hydraulic circuit.
  • an overridable differential pressure control valve 6.1 is advantageously arranged according to the invention between the directional valve 3.2 and the compensation cylinder 4.1.
  • This valve 6.1 reduces the pressure that is built up at connection 3.2 / B of the directional valve 3.2 to a value that is low enough that the unloaded loading system can no longer be raised by the compensation cylinder 4.1 alone.
  • the same protective function can also be achieved by an override pressure relief valve 6.1.
  • the pressure limiting valve 6.1 has a first control line III or first pilot line III for its control or actuation.
  • a valve unit 6 or valve block 6 comprises, in addition to the differential pressure control valve 6.1, further valves 6.2, 6.3, 6.4 and / or 6.5.
  • a second control line IV or a second, so-called pilot signal is available at connection 6 / X1 of the valve unit 6 through a branch 6.2 or an advantageous shuttle valve 6.2.
  • the connection 6 / X1 is advantageously connected to the pressure / working line from connection 2.2 / B of the lifting or directional valve 2.2 to connection 2.3 / A of the load-holding valve 2.3 on the lifting cylinder 2.1.
  • a signal pressure is built up at 6 / X1 of the valve unit 6 or of the valve 6.1 precisely when the machine operator initiates a lifting movement via the directional valve 2.2.
  • a force effect of the compensation cylinder 4.1 is desired or advantageous.
  • the load-holding valve 3.3 remains in its open switching state as long as there is no line break. This is achieved in an advantageous manner in that the line circuit to the tilt cylinder 3.1 is biased in a seat-tight manner with the aid of a shut-off valve arrangement 6.3 or shut-off block circuit 6.3.
  • the preload pressure results in that the (two) shut-off valves or load-holding valves are opened via the pressure in the respective opposite working line and should advantageously be higher than the necessary control pressure of load-holding valve 3.3.
  • a further differential pressure control valve 6.4 is advantageous so that the pre-tensioning of the tilt cylinder circuit is reliably maintained even after the cylinder has moved. This ensures that the line II between 3.1 / S of the tilt cylinder 3.1 and 6 / B1 is not completely relieved via the directional control valve 3.2 to the tank T during the tilting movements of the tool carrier 1.3.
  • the load-holding valve 3.3 of the blocking function is opened by means of a fourth control line V during these movements, which is why it cannot maintain the pre-tension.
  • circuit variants shown by way of example are basically also functional without the additional differential pressure control valve 6.4. For a reliable function is provided with this valve 6.4 in every load situation.
  • valve 6.1 which receives the additional pressure signal via 6 / X1 of valve block 6, alternatively, a separate control according to a second variant according to the invention as in FIG Figure 2 to realize shown.
  • a further valve 6.5 in particular a directional control valve 6.5, connected in parallel with the valve 6.1 can be provided.
  • This valve 6.5 can be opened electronically for example by an (electromagnetic) magnetic force.
  • electronic signals for example from an advantageous sensor, can control / actuate the valve 6.5.
  • the valve 6.5 is preferably actuated / controlled on the basis of the stroke movement on the directional valve 2.2, for example a magnet on the valve 6.5 is activated / switched on or off by means of the above-mentioned sensor signal, so that the valve 6.5 opens / closes.
  • the differential pressure control function can either be overridden directly by actuating valve 6.5 itself or bypassed by valve 6.5 or 2/2-way valve 6.2 connected in parallel to differential pressure control valve 6.1 (cf. Figure 2 ).
  • the two embodiments essentially have in common the principle of overriding the pressure-reducing functions of the valves in the line between the connections 3.1 / K of the tilt cylinder 3.1 and 4.1 / K of the compensation cylinder 4.1 in a controlled manner, without impairing the safety-relevant functions of the valves.
  • Advantageous features of the invention are the override of the differential pressure control valve 6.1 by an additional signal at the moment of an active lifting movement of the loading system and the holding of the load holding valve 3.3 in its open switch position by biasing the tilt cylinder circuit.
  • the system according to the invention requires less energy to lift the same load. This means that less work has to be done to raise the lift arm 1.1. This is due to the fact that the required pressure in the lifting cylinder 2.1 to lift a defined load is lower than in previous systems.
  • the load pressure of the tilt cylinder 3.1 is fully available when lifting on the bottom side of the compensating cylinder 4.1 and thus supports the lifting cylinder 2.1.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid-Pressure Circuits (AREA)
EP20203690.1A 2019-10-30 2020-10-23 Machine motrice dotée d'un cadre et d'une flèche pivotante Pending EP3816095A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019129300.6A DE102019129300A1 (de) 2019-10-30 2019-10-30 Kraftmaschine mit einem Rahmen und einem verschwenkbaren Ausleger

Publications (1)

Publication Number Publication Date
EP3816095A1 true EP3816095A1 (fr) 2021-05-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20203690.1A Pending EP3816095A1 (fr) 2019-10-30 2020-10-23 Machine motrice dotée d'un cadre et d'une flèche pivotante

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EP (1) EP3816095A1 (fr)
DE (1) DE102019129300A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021123223A1 (de) 2021-09-08 2023-03-09 Kramer-Werke Gmbh Hydraulikmaschine mit einem um eine Schwenkachse verschwenkbaren Ausleger

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600419A1 (fr) * 2003-02-27 2005-11-30 Hitachi Construction Machinery Co., Ltd. Dispositif de commande hydraulique d'une machine de travail hydraulique
US20140365081A1 (en) * 2010-11-02 2014-12-11 J.C. Bamford Excavators Limited Machine and Method of Manufacturing a Machine
WO2018044871A1 (fr) * 2016-08-30 2018-03-08 Clark Equipment Company Dispositif de levage de puissance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402840A (en) * 1967-02-24 1968-09-24 Case Co J I Loader bucket control
JPS6014817Y2 (ja) * 1979-04-18 1985-05-11 株式会社小松製作所 掘削積込機の掘削積込装置
FR2596378B1 (fr) * 1986-03-26 1988-07-08 Etude Innovation Materiel Agri Dispositif chargeur a compensation rapide et blocage pour tracteurs agricoles et analogues
CA2208471C (fr) * 1996-06-25 2004-10-05 Richard Francis Way Vehicule pour transporter du materiel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600419A1 (fr) * 2003-02-27 2005-11-30 Hitachi Construction Machinery Co., Ltd. Dispositif de commande hydraulique d'une machine de travail hydraulique
US20140365081A1 (en) * 2010-11-02 2014-12-11 J.C. Bamford Excavators Limited Machine and Method of Manufacturing a Machine
WO2018044871A1 (fr) * 2016-08-30 2018-03-08 Clark Equipment Company Dispositif de levage de puissance

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