EP2698477A2 - Attache rapide, procédé de fonctionnement d'une attache rapide et dispositif d'attache rapide - Google Patents

Attache rapide, procédé de fonctionnement d'une attache rapide et dispositif d'attache rapide Download PDF

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Publication number
EP2698477A2
EP2698477A2 EP13180732.3A EP13180732A EP2698477A2 EP 2698477 A2 EP2698477 A2 EP 2698477A2 EP 13180732 A EP13180732 A EP 13180732A EP 2698477 A2 EP2698477 A2 EP 2698477A2
Authority
EP
European Patent Office
Prior art keywords
hydraulic
locking
valve
chamber
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.)
Granted
Application number
EP13180732.3A
Other languages
German (de)
English (en)
Other versions
EP2698477B1 (fr
EP2698477A3 (fr
Inventor
Peter Lehnhoff
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.)
LEHNHOFF HARTSTAHL GmbH
Original Assignee
Lehnhoff Hartstahl GmbH and Co KG
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 Lehnhoff Hartstahl GmbH and Co KG filed Critical Lehnhoff Hartstahl GmbH and Co KG
Publication of EP2698477A2 publication Critical patent/EP2698477A2/fr
Publication of EP2698477A3 publication Critical patent/EP2698477A3/fr
Application granted granted Critical
Publication of EP2698477B1 publication Critical patent/EP2698477B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3663—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat hydraulically-operated

Definitions

  • the invention relates to a quick coupler according to the type specified in the preamble of claim 1, a method for operating a quick coupler according to the type specified in the preamble of claim 6 and a quick-change device according to claim 11.
  • Quick-change systems include a quick coupler for coupling a tool provided with an adapter to a work machine to which the quick coupler can be arranged, and are known in different designs.
  • quick couplers are operated purely mechanically by means of spring force, purely hydraulically by means of a double-acting hydraulic piston, or by a combination of mechanical locking and mechanical shut-off and with hydraulic unlocking by means of a single-acting hydraulic piston.
  • the invention is based on the combined version of a quick coupler.
  • This quick coupler is provided with a locking device for producing a mechanical connection between the machine and the tool.
  • the locking device has at least one locking element, which is acted upon by a spring force in the direction of a locking position.
  • a connected to the locking element hydraulic piston is provided, which is arranged displaceably in a hydraulic cylinder and divides the hydraulic cylinder interior into an opening chamber and a locking chamber.
  • the opening chamber is connected to a hydraulic valve via a first hydraulic line to apply hydraulic pressure to the opening chamber and thus the hydraulic piston as needed so that the hydraulic piston and the locking member connected to the hydraulic piston are moved from the locking position to an opening position against the spring force.
  • the object of the invention is therefore to provide a quick coupler according to the type specified in the preamble of claim 1, a method according to the type specified in the preamble of claim 6 and a quick-change device such that while avoiding the disadvantages mentioned the locking element in the locked position sure and even under extreme conditions of the quick coupler.
  • the invention is based on the finding that the holding force in the locking position can be improved in a simple manner if in addition acts on the locking element, a hydraulic force and thereby the hydraulic piston and thus the locking element not only by the spring force, but also by a hydraulic force held and fixed in the locking position.
  • the locking chamber is connected to a hydraulic valve via a second hydraulic line.
  • the locking chamber is acted upon by hydraulic oil, if necessary, so that is fixed in the locking position of the hydraulic piston and thus the locking element in the locking position.
  • a hydraulic control is provided for this, which switches a hydraulic valve so that corresponding hydraulic oil is present in the locking chamber as soon as the locking element is in the locking position.
  • the hydraulic valve is switched so that the hydraulic oil can escape as soon as the locking element is moved from the locking position to the open position.
  • the first hydraulic line and the second hydraulic line are connected to each other and connected via a hydraulic supply line to a common hydraulic valve.
  • the hydraulic valve is a directional control valve, in particular a 4/2-way valve.
  • the lock member is secured in the lock position, in which hydraulic oil is set in the lock chamber, whereby the hydraulic piston is fixed by a hydraulic force in the lock position.
  • the opening movement against the spring force can then be carried out readily, wherein then sets hydraulic pressure in the opening chamber and the hydraulic oil is pushed out of the locking chamber again.
  • a further valve is introduced into the second hydraulic line, wherein preferably then the first and second hydraulic line are short-circuited via a connecting line.
  • the connecting line is connected to the second line between the supply line and the other valve. If the connecting region of the connecting line and the second hydraulic line is arranged just behind the further valve and the further valve as close as possible to the hydraulic cylinder with the hydraulic piston, rapid movement of the locking element from the locking position into the open position is made possible.
  • the further valve is formed by a pilot-operated check valve.
  • the non-return valve is connected by a control line connected to the first hydraulic line. With a pressure increase in the first hydraulic line and thus with the beginning of the opening movement, the non-return valve is opened, so turned on.
  • the further valve can be formed by a safety valve, in particular by a proportional valve with a pressure-limiting function, such as a lowering-brake valve.
  • the safety valve can relieve the hydraulic system briefly in case of impermissibly high loads between quick coupler on the one hand and adapter with tool on the other hand to avoid damage to the components of the quick coupler.
  • a hydraulic counterforce acts in the opening direction on the locking element via the hydraulic piston, so that the locking element is locked in its two directions of movement.
  • a hydraulic force acts on the hydraulic piston in the opening direction and thus on the locking element and against the spring force, so that the locking element is also fixed by the hydraulic force in the open position.
  • Fig. 1 shows a quick-change device 10, via which a tool in the form of a spoon 12 is releasably attached to an excavator 14. For reasons of clarity, only the boom of the excavator 14 is shown here.
  • the quick-change device 10 comprises a connected to the boom quick coupler 16 and an arranged on spoon 12 adapter 18.
  • a later described in more detail locking device 32 is a mechanical coupling between the quick coupler 16 and adapter 18 produced so that a simple and quick tool change, for example, the shown spoons 12 and recording a hydraulic hammer or the like, is possible.
  • FIG. 2 schematically the operation of the locking device 32 of the quick coupler 16 is shown.
  • the quick coupler 16 two interconnected via a cross member 20 locking bolt 22 and 24 are shown.
  • the cross strut 20 is fixedly connected via a hydraulic piston rod 26 with a hydraulic piston 28.
  • the hydraulic piston 28 is displaceably mounted in a hydraulic cylinder 30.
  • the locking bolts 22, 24 are part of the locking device 32 of the quick coupler 16.
  • the locking bolts 22, 24 engage in the locking position in corresponding receptacles of the Fig. 2 not shown adapters 18 and lock the quick coupler 16 with the adapter 18 and thus with the spoon 12th
  • the locking bolts 22, 24 act springs 34, 36 in the locking direction, which is represented by the arrow 38.
  • the arrow 40 indicates the opening direction.
  • the locking bolts 22, 24 are moved to connect / couple with the adapter 18 in the locking direction 38 and for uncoupling in the opening direction 40.
  • the hydraulic piston 28 divides the hydraulic cylinder 30 into a lock chamber 42 and an opening chamber 44.
  • the lock chamber 42 is connected to a supply line 48 via a second hydraulic line 46.
  • the opening chamber 44 is also connected to the supply line 48 via a first hydraulic line 50.
  • a pilot-operated check valve 52 is introduced in the second hydraulic line 46 .
  • a connecting line 54 connects the first hydraulic line 50 to the second hydraulic line 46.
  • the supply line 48 is connected to a switchable 4/2-way valve 56.
  • the hydraulic valve 56 is usually connected to the hydraulic system, wherein one port 56a is connected to a hydraulic line 60 leading a hydraulic pump and the other port 56b is connected to a hydraulic line 58 leading to the hydraulic tank.
  • a quick coupler 16 is provided with integrated shut-off function.
  • a hydraulic pressure in the opening chamber 44 of the hydraulic cylinder 30 is established by corresponding switching of the 4/2-way valve 56.
  • the check valve 52 is unlocked, whereby the hydraulic oil contained in the lock chamber 42 is successively supplied to the opening chamber 44 via the second hydraulic line 46, via the unlocked check valve 52, the connection line 54, the first hydraulic line 50.
  • Hydraulic pressure px area A bar cross section > F must be spring .
  • the quick coupler is unlocked by the locking bolts 22, 24 move in the opening direction in the open position.
  • the pressure p in the opening chamber 44 is connected to the tank, so that the pressure drops.
  • the force of the springs 34, 36 presses the locking bolts 22, 24 in the locking direction 38 and the clamp changer 16 is locked.
  • the hydraulic oil is pushed out of the opening chamber 44.
  • the volume in the hydraulic cylinder 30 of the lock chamber 42 increases, creating a suction effect.
  • the hydraulic oil, which is pushed out of the opening chamber 44 flows against the usually in mobile hydraulic systems adjacent dynamic pressure first via the first hydraulic line 50 in the direction of the tank.
  • the hydraulic oil flows from the first hydraulic line 50, through the connection line 54, through the check valve 52, the second hydraulic line 46 to the lock chamber 42 of the hydraulic cylinder 30 and completely fills the increasing space with hydraulic oil.
  • the locking bolts 22, 24 loaded in the opening direction 40 with a force which exceeds the force of the springs 34, 36 closes the pilot operated check valve 52, the hydraulic oil in the locking chamber 42 of the hydraulic cylinder 30 and thereby blocks the locking device 32 hydraulically a far greater holding force of the locking device 32 of the quick coupler 16 is achieved than by the usual pure spring action by the springs 34, 36th
  • the invention is thus distinguished from the prior art by a hydraulically operated quick-change device 10, in which the mechanical locking function is additionally supported hydraulically. All components required for this purpose can be integrated in a hydraulic block cylinder. Despite the double loading of the hydraulic cylinder 30, only one hydraulic connection 56c to the hydraulic valve 56 is required both for the movement in the opening direction 40 and for the movement in the locking direction 38, which significantly reduces the installation costs.
  • the port 56c is connected to the supply line 48.
  • the connection 56d is disabled.
  • a safety valve of the hydraulic valve 56 for example, a proportional valve, such as a lowering-brake valve can be used. Through this valve, the hydraulic system can be temporarily relieved to avoid damage to the components of the quick coupler 16.
  • a control 62 which switches the hydraulic valve 56 for locking and unlocking the quick coupler 16 via a line 64.
  • the first hydraulic line 50 is connected to the check valve 52.
  • the check valve 52 is opened, ie opened. Hydraulic oil may escape from the lock chamber 42 via the second hydraulic line 46 and the open check valve 52.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
EP13180732.3A 2012-08-17 2013-08-16 Attache rapide, procédé de fonctionnement d'une attache rapide et dispositif d'attache rapide Active EP2698477B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012107567.0A DE102012107567B4 (de) 2012-08-17 2012-08-17 Schnellwechsler, Verfahren zum Betreiben eines Schnellwechslers und Schnellwechselvorrichtung

Publications (3)

Publication Number Publication Date
EP2698477A2 true EP2698477A2 (fr) 2014-02-19
EP2698477A3 EP2698477A3 (fr) 2017-11-01
EP2698477B1 EP2698477B1 (fr) 2020-09-23

Family

ID=49003663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13180732.3A Active EP2698477B1 (fr) 2012-08-17 2013-08-16 Attache rapide, procédé de fonctionnement d'une attache rapide et dispositif d'attache rapide

Country Status (3)

Country Link
EP (1) EP2698477B1 (fr)
DE (1) DE102012107567B4 (fr)
ES (1) ES2827002T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109555177A (zh) * 2019-01-25 2019-04-02 北京科技大学 一种液压自动快速切换对接平台
DE102017122889A1 (de) 2017-10-02 2019-04-04 Lehnhoff Hartstahl Gmbh Schnellwechsler
DE102018115249A1 (de) 2018-06-25 2020-01-02 Lehnhoff Hartstahl Gmbh Schnellwechsler und Schnellwechselvorrichtung mit einem Schnellwechsler
CN112982522A (zh) * 2021-02-20 2021-06-18 三一重机有限公司 挖掘机的属具更换装置的控制系统及具有其的挖掘机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705656A (en) * 1971-02-18 1972-12-12 Deere & Co Quick-attach loader bucket
FR2697302B1 (fr) * 1992-10-23 1994-12-30 Dorguin Jean Pierre Dispositif d'attache rapide pour équipement d'engin de génie civil et de manutention.
SE9701887D0 (sv) * 1997-05-21 1997-05-21 Accima Ab Anordning för lösbar sammankoppling av ett arbetsredskap och en grävmaskins manöverarm
AT2322U3 (de) * 1998-05-19 1999-04-26 Baumaschinentechnik Ges M B H Schnellwechselvorrichtung für bagger mit verriegelungssicherung
IT1310182B1 (it) * 1999-03-02 2002-02-11 Mantovanibenne S R L Dispositivo per il bloccaggio e lo sbloccaggio rapidi di attrezzi abracci operatori.
KR200271162Y1 (ko) * 1999-05-11 2002-04-10 이원해 굴삭기의 굴착장비 착탈용 커플러
DE102005033535A1 (de) * 2005-07-14 2007-01-18 Deere & Company, Moline Hydraulische Anordnung
GB2474572B (en) * 2009-10-16 2014-11-26 Hill Engineering Ltd Control system for a hydraulic coupler

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017122889A1 (de) 2017-10-02 2019-04-04 Lehnhoff Hartstahl Gmbh Schnellwechsler
DE102018115249A1 (de) 2018-06-25 2020-01-02 Lehnhoff Hartstahl Gmbh Schnellwechsler und Schnellwechselvorrichtung mit einem Schnellwechsler
WO2020002323A1 (fr) 2018-06-25 2020-01-02 Lehnhoff Hartstahl Gmbh Élément à changement rapide et arrangement de changement rapide avec un élément à changement rapide
CN109555177A (zh) * 2019-01-25 2019-04-02 北京科技大学 一种液压自动快速切换对接平台
CN109555177B (zh) * 2019-01-25 2023-10-17 北京科技大学 一种液压自动快速切换对接平台
CN112982522A (zh) * 2021-02-20 2021-06-18 三一重机有限公司 挖掘机的属具更换装置的控制系统及具有其的挖掘机
CN112982522B (zh) * 2021-02-20 2022-10-04 三一重机有限公司 挖掘机的属具更换装置的控制系统及具有其的挖掘机

Also Published As

Publication number Publication date
DE102012107567B4 (de) 2015-03-19
ES2827002T3 (es) 2021-05-19
EP2698477B1 (fr) 2020-09-23
EP2698477A3 (fr) 2017-11-01
DE102012107567A1 (de) 2014-02-20

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