EP0708053A1 - Système de protection contre la surcharge pour grues hydrauliques à flèche, spécialement celles montées sur des véhicules à moteur - Google Patents

Système de protection contre la surcharge pour grues hydrauliques à flèche, spécialement celles montées sur des véhicules à moteur Download PDF

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Publication number
EP0708053A1
EP0708053A1 EP94113387A EP94113387A EP0708053A1 EP 0708053 A1 EP0708053 A1 EP 0708053A1 EP 94113387 A EP94113387 A EP 94113387A EP 94113387 A EP94113387 A EP 94113387A EP 0708053 A1 EP0708053 A1 EP 0708053A1
Authority
EP
European Patent Office
Prior art keywords
boom
pressure
protection system
pressure sensor
overload protection
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Withdrawn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
EP94113387A
Other languages
German (de)
English (en)
Inventor
Leif Christian Rask
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.)
Hiab Export AS
Original Assignee
Hiab Export AS
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 Hiab Export AS filed Critical Hiab Export AS
Priority to EP94113387A priority Critical patent/EP0708053A1/fr
Publication of EP0708053A1 publication Critical patent/EP0708053A1/fr
Withdrawn legal-status Critical Current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
    • B66C23/905—Devices for indicating or limiting lifting moment electrical
    • 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 present invention relates to an overload protection system for hydraulic boom cranes, such as set forth in the preamble of Claim 1.
  • a critical parameter i.e. the pressure in the hydraulic cylinder, with which the boom is raised and lowered, is sensed by a highly reliable sensor available at low cost, reacting to an excessive pressure by causing the operation control means to limit or prevent movement of the boom in the requisite manner to avoid dangerous situations arising and to produce suitable alarm signals warning the operator.
  • the hydraulic boom crane shown therein comprises a base 1 adapted to be secured to a suitable mounting (not shown), such as a loading platform or a motor vehicle.
  • An approximately vertical column 2 is rotatably supported on the base 1 for rotation about a vertical axis 3, the base 1 for this purpose being equipped with a suitable actuator, well known to persons skilled in this art.
  • a boom 4 is at one end pivotably supported on the top end of the column 2 by means of a horizontal pivot pin 5 extending along a horizontal axis 6 (during actual operation, the axes 3 and 6 may deviate somewhat from the vertical and horizontal directions respectively, when the base 1 is supported by a motor vehicle or similar movable mounting).
  • the latter is provided with a hook 7, and further hooks (not shown) or other load-engaging means may be provided in other locations along the length of the boom.
  • the raising and lowering of the boom 4 about the pivot pin 5 is carried out by means of a hydraulic cylinder 8, the lower end of which is hingedly connected to the column 2, whereas its upper, extensible end is pivotably connected to the boom 4 by means of a pin 9 at a distance from the pivot pin 5.
  • the hydraulic system for the operation the boom 4 consists in a manner known per se of a pump 10 receiving hydraulic liquid, in the following text referred to as "oil", although other liquids may be used, from a reservoir 11 through a solenoid-operated dump valve 12, from which the oil, depending on the position of the dump valve 12, flows either back to the reservoir 11 or to a manually operable control-valve assembly 13, by means of which the oil, set under pressure by the pump 10, may be made to flow to the hydraulic cylinder 8, either through an "up” conduit 14 in order to raise the boom 4, or through a "down” conduit 15 in order to lower the boom, the oil from the piston-rod side of the piston in the cylinder 8 flowing in the conventional way out through either the "down" conduit 15 or the "up” conduit 14 respectively.
  • the equipment also comprises two pressure sensors, viz. a first pressure sensor 16 and a second pressure sensor 17, both connected to the "up" conduit 14 so as to sense the pressure in the lowermost part of the hydraulic cylinder 8, and hence indirectly the downward moment exerted on the boom 4 about the horizontal axis 6.
  • Both pressure sensors 16 and 17 are connected to a control and alarm box 18 to be described below with reference to Figure 3, and the first pressure sensor 16 is adjusted to react to a pressure corresponding to e.g.
  • the control and alarm box 18 receives DC voltage from a battery 19, that may or may not be the battery belonging to a motor vehicle, on which the crane is mounted, and uses this voltage to control the dump valve 12 in dependence on the signals received from the pressure sensors 16 and 17, and also to emit signals appropriate to the actual condition of the system.
  • the box 18 comprises an LED array 20 and a buzzer 21.
  • the control and alarm box 18 is also connected to the solenoid-operated dump valve 12.
  • control and alarm box 18 The operating principle of the control and alarm box 18 will now be explained with reference to Figure 3.
  • the control and alarm box 18 is described as comprising a number of "traditional" circuit elements cooperating in the simplest possible manner, whereas in practice, the control and alarm box will to a great extent be based upon the use of electronic or semiconductor elements, such as transistors and/or integrated circuits.
  • the ON/OFF and emergency stop button 22 is represented in Figure 3 by an ON/OFF button 22a and an emergency stop button 22b, whereas of the LED array 20 shown in Figure 1, only the red part 20a is shown in Figure 3.
  • the ON/OFF button 22a will be in the ON position, thus supplying direct current through the emergency stop button 22b and the normally closed contact 17b on the second pressure sensor 17 (i.e. the sensor for 100%) and through a normally closed break delay timer 23 to the solenoid 12a of the dump valve 12, thus keeping the dump valve 12 in the operating position shown in Figure 1.
  • the boom 4 may be manoeuvred according to need by using the control-valve assembly 13 in the conventional manner.
  • the first pressure sensor 16 will react by closing the normally open contact 16a. This will supply direct current to a flashing relay 24, the latter through its normally open contact 24a supplying periodically interrupted direct current to the red part 20a of the LED array 20 so as to make it emit flashes of red light, and to the buzzer 21 so as to make the latter emit loud alarm signals, all this to warn the operator that the crane has entered a critical zone of operation.
  • control and alarm box 18 will also include so-called “fail-to-safety” functions so as to avoid dangerous situations arising if there is a failure in one or more of the component parts of the system.
  • “fail-to-safety” functions so as to avoid dangerous situations arising if there is a failure in one or more of the component parts of the system. Persons skilled in this art will know how to devise the requisite means to achieve such functions.
  • Figures 4 and 5 are sequence diagrams showing various situations that may arise during the operation of the crane. Generally speaking, these diagrams will speak for themselves, but it may be noted,
  • the "green LED” referred to in the second block from the top in the center column of Figure 4 is a green light-emitting diode 20b shown in Figure 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
EP94113387A 1994-08-26 1994-08-26 Système de protection contre la surcharge pour grues hydrauliques à flèche, spécialement celles montées sur des véhicules à moteur Withdrawn EP0708053A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94113387A EP0708053A1 (fr) 1994-08-26 1994-08-26 Système de protection contre la surcharge pour grues hydrauliques à flèche, spécialement celles montées sur des véhicules à moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94113387A EP0708053A1 (fr) 1994-08-26 1994-08-26 Système de protection contre la surcharge pour grues hydrauliques à flèche, spécialement celles montées sur des véhicules à moteur

Publications (1)

Publication Number Publication Date
EP0708053A1 true EP0708053A1 (fr) 1996-04-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113387A Withdrawn EP0708053A1 (fr) 1994-08-26 1994-08-26 Système de protection contre la surcharge pour grues hydrauliques à flèche, spécialement celles montées sur des véhicules à moteur

Country Status (1)

Country Link
EP (1) EP0708053A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997029038A1 (fr) * 1996-02-07 1997-08-14 Højbjerg Maskinfabrik A/S Systeme de commande de charge, de preference pour des grues hydrauliques
EP1031531A2 (fr) * 1999-02-26 2000-08-30 MAN Wolffkran GmbH Grue à porteé variable
EP1607365A1 (fr) * 2004-06-18 2005-12-21 Hiab AB Grue hydraulique
WO2012109558A1 (fr) * 2011-02-10 2012-08-16 Eaton Corporation Commande de détection de charge ayant un mode attente en cas de surcharge
ES2690882R1 (es) * 2017-03-29 2018-12-14 Industrias Guerra, S.A. Mecanismo limitador de la carga de una grúa en una embarcación
EP2855334B1 (fr) 2012-05-31 2019-08-21 Wolffkran Holding AG Grue à tour à flèche relevable comprenant un dispositif électrohydraulique avec un moteur asynchrone triphasé pour la commande d'une flèche
CN112828934A (zh) * 2021-01-04 2021-05-25 中联重科股份有限公司 确定臂架姿态的方法和装置、监控方法和装置及工程机械

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123814A (en) * 1962-02-09 1964-03-03 Safe load indicating devices for cranes
US3757066A (en) * 1971-11-29 1973-09-04 Kidde & Co Walter Safe load control system for telescopic crane booms
GB1403046A (en) * 1972-09-08 1975-08-13 Weimar Kombinat Veb Load factor safety mechanism
GB2078197A (en) * 1980-06-04 1982-01-06 Hiab Foco Ab Load limiting device
FR2592368A1 (fr) * 1985-12-31 1987-07-03 Cormach Dispositif limiteur du moment basculant ou de la surcharge pour grue hydraulique a bras articule et telescopique.
FR2677629A1 (fr) * 1991-06-17 1992-12-18 Senergy Sarl Procede de controle de la charge pour un engin de levage et dispositif pour sa mise en óoeuvre.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123814A (en) * 1962-02-09 1964-03-03 Safe load indicating devices for cranes
US3757066A (en) * 1971-11-29 1973-09-04 Kidde & Co Walter Safe load control system for telescopic crane booms
GB1403046A (en) * 1972-09-08 1975-08-13 Weimar Kombinat Veb Load factor safety mechanism
GB2078197A (en) * 1980-06-04 1982-01-06 Hiab Foco Ab Load limiting device
FR2592368A1 (fr) * 1985-12-31 1987-07-03 Cormach Dispositif limiteur du moment basculant ou de la surcharge pour grue hydraulique a bras articule et telescopique.
FR2677629A1 (fr) * 1991-06-17 1992-12-18 Senergy Sarl Procede de controle de la charge pour un engin de levage et dispositif pour sa mise en óoeuvre.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997029038A1 (fr) * 1996-02-07 1997-08-14 Højbjerg Maskinfabrik A/S Systeme de commande de charge, de preference pour des grues hydrauliques
EP1031531A2 (fr) * 1999-02-26 2000-08-30 MAN Wolffkran GmbH Grue à porteé variable
EP1031531A3 (fr) * 1999-02-26 2004-06-16 MAN Wolffkran GmbH Grue à porteé variable
EP1607365A1 (fr) * 2004-06-18 2005-12-21 Hiab AB Grue hydraulique
US7523835B2 (en) 2004-06-18 2009-04-28 Hiab Ab Hydraulic crane
WO2012109558A1 (fr) * 2011-02-10 2012-08-16 Eaton Corporation Commande de détection de charge ayant un mode attente en cas de surcharge
EP2855334B1 (fr) 2012-05-31 2019-08-21 Wolffkran Holding AG Grue à tour à flèche relevable comprenant un dispositif électrohydraulique avec un moteur asynchrone triphasé pour la commande d'une flèche
ES2690882R1 (es) * 2017-03-29 2018-12-14 Industrias Guerra, S.A. Mecanismo limitador de la carga de una grúa en una embarcación
CN112828934A (zh) * 2021-01-04 2021-05-25 中联重科股份有限公司 确定臂架姿态的方法和装置、监控方法和装置及工程机械

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