EP0282806A1 - Système de commande d'un appareil hydraulique, en particulier une grue de chargement - Google Patents

Système de commande d'un appareil hydraulique, en particulier une grue de chargement Download PDF

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Publication number
EP0282806A1
EP0282806A1 EP88103064A EP88103064A EP0282806A1 EP 0282806 A1 EP0282806 A1 EP 0282806A1 EP 88103064 A EP88103064 A EP 88103064A EP 88103064 A EP88103064 A EP 88103064A EP 0282806 A1 EP0282806 A1 EP 0282806A1
Authority
EP
European Patent Office
Prior art keywords
valve
lever
control lever
control
hand
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
EP88103064A
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German (de)
English (en)
Other versions
EP0282806B1 (fr
Inventor
Karl Wimmer
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.)
Palfinger AG
Original Assignee
Palfinger AG
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 Palfinger AG filed Critical Palfinger AG
Publication of EP0282806A1 publication Critical patent/EP0282806A1/fr
Application granted granted Critical
Publication of EP0282806B1 publication Critical patent/EP0282806B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment

Definitions

  • the invention relates to a device for controlling a hydraulically operated device, in particular a loading crane, with at least one control unit which has a control valve, the valve piston of which can be deflected in at least one control lever in two opposite directions from a neutral position against spring force in order to move to activate the device with a protective device which, when a limit value of the movement occurs, releases a catch arranged in the linkage connecting the control lever and the valve piston in the direction causing the limit value of the movement to be exceeded and thus the return of the valve piston by the spring force into the allows neutral position while maintaining the positive connection in the opposite direction.
  • a matching latching would therefore have to be produced with a high degree of accuracy and moreover be well sealed against external influences, in particular contamination, which leads to an increase in price. Flawless functioning is only conceivable if the control valve and latching are assembled into one unit; in general, however, it is desirable to use different valves with a standard locking, or vice versa. As a rule, several control valves are housed in a single block, in which case only individual hydraulic circuits require protection. However, if the latching is now arranged separately from the valve, the short valve paths make it difficult to adjust the latching.
  • valve lever which is pivotably mounted about a fixed pivot point is provided, which is articulated on the one hand on the valve piston and on the other hand is connected to the control lever with the interposition of the locking which can be triggered by the protective device.
  • Fig. 1 of a known loading crane 2 only the swivel arm 12 is shown, which can be raised or lowered by means of a hydraulic drive 13 consisting of cylinder and piston with piston rod. It is easy to see that the load moment is reduced or increased by this lifting and lowering movement.
  • the cylinder space 13 ⁇ of the hydraulic drive 13 assigned to the lowering movement is connected to a control valve 14 via a lowering line 17.
  • the cylinder chamber 13 ⁇ communicates via a line 18 with an overload valve 22.
  • This overload valve is biased into the closed position by means of a spring and has a control piston which counteracts the spring force and communicates with the line 18 via a line 20.
  • the overload valve 22 responds in a known manner, i.e. it connects the line 18 to the line 23 and thus actuates a locking drive 15.
  • This locking drive 15 moves all the control valves 14 into a neutral position, which hydraulic drives are assigned, which can cause a movement which increases the load moment. According to the prior art, this is done by the blocking drive 15 directly displacing the valve piston 1 of the control valve 14. According to the invention, however, the locking drive 15 is used to cancel the positive connection between the control lever 2 and the valve piston 1 in one direction of movement.
  • valve piston 1 of the control valve 14 is coupled to the control lever 2 via a valve lever 4. Both the valve lever 4 and the control lever 2 can be pivoted about a pivot axis 5 which is fixedly arranged on the housing 6 of the valve 14.
  • the control lever 2 is through a Tab 21 connected to the pivot axis 5, which makes it possible to actuate the control lever 2 directly via its handle or via the linkage 7.
  • This linkage 7 leads in a known manner to a pivotable handle arranged on the opposite side of the vehicle.
  • a sleeve 8 is arranged, which is fixedly connected to the hydraulically operated locking drive 15.
  • the valve lever 4 is connected via a linkage 10 to a pin 9 which is mounted in the sleeve 8.
  • the locking drive 15 forms, together with an annular groove 30 on the pin 9, a latching 3, which is released by excess pressure in the hydraulic system.
  • the articulation 10 of the valve lever 4 is displaceable in the slot 11 of the sleeve 8. This means that the valve lever 4 can return to its neutral position, even if the control lever 2 is deflected upwards.
  • the valve lever 4 can continue to be pivoted by means of the control lever 2 in the sense of inserting the valve piston 1 as soon as, as shown in FIG. 2, the linkage 10 strikes the upper edge of the elongated hole 11.
  • the latching according to the invention is formed by two pairs of stops 24, 31 and 24 , 31 ⁇ , respectively, where a pair of stops can be disengaged. This makes it possible to either make the upward movement or the downward movement of the control lever 2 ineffective, which is necessary if it is not certain from the outset which type of pivoting of the control lever leads to an increase in the load torque.
  • valve lever in the embodiment of Fig.3 consists of two parts 4,4 ⁇ connected by screws 29, is only a constructive detail. It appears more important to note that the actuation of the stops 31, 31 ⁇ here is not hydraulic, as in the exemplary embodiment according to FIG. 2, but by servomotors 27, 27 ⁇ , which are connected by means of lines 26, 26 ⁇ to a sensor for the occurrence of overload .
  • the servomotors 27, 27 ⁇ are expediently switched such that, in the event of a power failure, actuation of the valve lever 4 by the control lever 2 is not possible. Stops 32,32 ⁇ can prevent the control lever 2 from pivoting so far relative to the valve lever 4 that one of the stops 31,31 ⁇ engages with the wrong stop 32,32 ⁇ when switched on again. Instead of providing stops 32, 32 ⁇ , the control lever 2 can also be preloaded towards its neutral position by a relatively weak spring.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)
  • Mechanical Control Devices (AREA)
EP19880103064 1987-03-02 1988-03-01 Système de commande d'un appareil hydraulique, en particulier une grue de chargement Expired - Lifetime EP0282806B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT45287A AT388359B (de) 1987-03-02 1987-03-02 Einrichtung zur steuerung eines hydraulisch betaetigten geraetes, insbesondere eines ladekrans
AT452/87 1987-03-02

Publications (2)

Publication Number Publication Date
EP0282806A1 true EP0282806A1 (fr) 1988-09-21
EP0282806B1 EP0282806B1 (fr) 1990-05-30

Family

ID=3490996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880103064 Expired - Lifetime EP0282806B1 (fr) 1987-03-02 1988-03-01 Système de commande d'un appareil hydraulique, en particulier une grue de chargement

Country Status (3)

Country Link
EP (1) EP0282806B1 (fr)
AT (1) AT388359B (fr)
DE (1) DE3860184D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102069783A (zh) * 2010-12-31 2011-05-25 徐州重型机械有限公司 汽车起重机及其支腿操纵装置
WO2016181141A2 (fr) 2015-05-11 2016-11-17 The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust Système d'avertissement de sécurité

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276307B (de) * 1966-10-01 1968-08-29 Miag Muehlenbau & Ind Gmbh Einrichtung zur selbsttaetigen Begrenzung des Lastmomentes bei Auslegerkranen mit hydraulischem Antrieb
US3645407A (en) * 1970-06-15 1972-02-29 Daniel F Przybylski Overload protector for crane booms
US3792780A (en) * 1971-12-02 1974-02-19 Kidde & Co Walter Mechanism for positioning and restricting crane control levers to prevent dangerous load condition
DE2344168A1 (de) * 1973-09-01 1975-03-06 Krueger & Co Einrichtung zur sicherung eines betaetigungsgestaenges von kranen bei ueberschreiten eines vorgegebenen maximalen lastmomentes
US4119118A (en) * 1977-01-13 1978-10-10 Walter Kidde & Company, Inc. Automatic machine motion restricting mechanism
DE2846394A1 (de) * 1977-11-01 1979-05-03 Koehring Co Zusammenlegbares oder ausziehbares gestaenge fuer eine materialhandhabungseinrichtung mit ladebaum
EP0037348A2 (fr) * 1980-03-21 1981-10-07 Roger Manjot Système de sécurité pour appareil de levage à commande hydraulique
US4422619A (en) * 1981-07-21 1983-12-27 Griffiths Edward E Remote valve operating system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501753C3 (de) * 1975-01-17 1979-05-23 Kittel, Artur, 8034 Neugermering Einrichtung zur wahlweisen Fern- und Nahsteuerung für hydraulisch betätigte Kräne

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276307B (de) * 1966-10-01 1968-08-29 Miag Muehlenbau & Ind Gmbh Einrichtung zur selbsttaetigen Begrenzung des Lastmomentes bei Auslegerkranen mit hydraulischem Antrieb
US3645407A (en) * 1970-06-15 1972-02-29 Daniel F Przybylski Overload protector for crane booms
US3792780A (en) * 1971-12-02 1974-02-19 Kidde & Co Walter Mechanism for positioning and restricting crane control levers to prevent dangerous load condition
DE2344168A1 (de) * 1973-09-01 1975-03-06 Krueger & Co Einrichtung zur sicherung eines betaetigungsgestaenges von kranen bei ueberschreiten eines vorgegebenen maximalen lastmomentes
US4119118A (en) * 1977-01-13 1978-10-10 Walter Kidde & Company, Inc. Automatic machine motion restricting mechanism
DE2846394A1 (de) * 1977-11-01 1979-05-03 Koehring Co Zusammenlegbares oder ausziehbares gestaenge fuer eine materialhandhabungseinrichtung mit ladebaum
EP0037348A2 (fr) * 1980-03-21 1981-10-07 Roger Manjot Système de sécurité pour appareil de levage à commande hydraulique
US4422619A (en) * 1981-07-21 1983-12-27 Griffiths Edward E Remote valve operating system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102069783A (zh) * 2010-12-31 2011-05-25 徐州重型机械有限公司 汽车起重机及其支腿操纵装置
CN102069783B (zh) * 2010-12-31 2012-08-15 徐州重型机械有限公司 汽车起重机及其支腿操纵装置
WO2016181141A2 (fr) 2015-05-11 2016-11-17 The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust Système d'avertissement de sécurité
US12029888B2 (en) 2015-05-11 2024-07-09 The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust Safety warning system

Also Published As

Publication number Publication date
EP0282806B1 (fr) 1990-05-30
ATA45287A (de) 1988-11-15
AT388359B (de) 1989-06-12
DE3860184D1 (de) 1990-07-05

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