EP0037348B1 - Système de sécurité pour appareil de levage à commande hydraulique - Google Patents

Système de sécurité pour appareil de levage à commande hydraulique Download PDF

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Publication number
EP0037348B1
EP0037348B1 EP81420036A EP81420036A EP0037348B1 EP 0037348 B1 EP0037348 B1 EP 0037348B1 EP 81420036 A EP81420036 A EP 81420036A EP 81420036 A EP81420036 A EP 81420036A EP 0037348 B1 EP0037348 B1 EP 0037348B1
Authority
EP
European Patent Office
Prior art keywords
pressure
movement
distributor
threshold
rod
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.)
Expired
Application number
EP81420036A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0037348A2 (fr
EP0037348A3 (en
Inventor
Roger Manjot
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.)
Individual
Original Assignee
Individual
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
Priority claimed from FR8007238A external-priority patent/FR2478607A1/fr
Priority claimed from FR8013018A external-priority patent/FR2483903A1/fr
Application filed by Individual filed Critical Individual
Priority to AT81420036T priority Critical patent/ATE14866T1/de
Publication of EP0037348A2 publication Critical patent/EP0037348A2/fr
Publication of EP0037348A3 publication Critical patent/EP0037348A3/fr
Application granted granted Critical
Publication of EP0037348B1 publication Critical patent/EP0037348B1/fr
Expired 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 a safety system for a hydraulically controlled lifting device.
  • This device is for example constituted by a hydraulic crane as shown in Figure 1 of the accompanying schematic drawing, comprising a base column 2 on which is articulated a first arm 3 at the other end of which is articulated a telescopic arm 4. It it is important to have permanent information on the position of the point of application of the load P at the end of the telescopic arm 4 relative to two horizontal planes H1 and H2 containing, respectively, the axis of articulation 01 of the arm 3 on the base column 2 and the articulation axis 02 of the telescopic arm 4 on the arm 3.
  • the output of the rod of the jack V1 must be possible because it corresponds to a reduction in the force, but the output of the rod of the cylinder V2 corresponding to an increase in the torque, should only be possible if the pressure in the cylinders V1 and V2 does not exceed the permitted value.
  • each jack allowing the angular variation of two arms is equipped with a pressure detection device comprising two thresholds, the second of which, detecting the highest pressure corresponds to the limit pressure allowed , the actuating means of the jacks being such that when a pressure corresponding to the lower threshold is reached, the exit from the telescope is made impossible, just as, according to the hypothesis chosen to assimilate the movement of exit from the telescope to a reduction or an increase in the angles (a, ⁇ ) formed by the different arms (2, 3, 4), the re-entries or exits of the rods of the jacks (V1, V2) correspond, respectively, to a reduction or to an increase in the angles (a, ⁇ ) that form the different arms, the output, respectively the re-entry, of the rods of these jacks being possible and the increase, respectively the decrease in the angles ( ⁇ , ⁇ ) that form the different arms, being carried out in s the extent to which the second threshold is not reached, while, if this
  • This arrangement makes it possible, thanks to the second pressure threshold detected, to assess the position of the point of application of the load by interpreting the effects consecutive to the position variation of this point of application of the load relative to the two planes H1 and H2 whose H1 is fixed and whose H2 is variable in height.
  • the pressure detection device associated with each cylinder allowing the angular variation of two arms is constituted by a pressure switch comprising two pressure detection thresholds.
  • the pressure detection device associated with each cylinder allowing the angular variation of two arms is constituted by two pressure switches mounted in series, each of which comprises a determined pressure detection threshold.
  • the effects of the detection device can be expressed either by actuation on each distributor in the opposite direction to that which caused a dangerous pressure to be reached, or by actuation of a solenoid valve mounted on the safety circuit of the hydraulic system.
  • the first pressure threshold is reached in one of the cylinders V1 or V2. This achievement of the first threshold condemns the re-entry of the rods of the cylinders V1 and V2, as well as the exit from the telescope 4. It is impossible to lower the load. If it were otherwise, when taking a load at height and exceeding during the descent the capacity of the device, there would be no safety position.
  • the pressure increase will no longer have an effect on the initial safety system triggered by reaching the first threshold. Then comes into play the use of the second threshold which will assess the value of the pressure growth which will increase since the point of application of the load is below the plane H2. If this displacement of the load by increasing the angle ⁇ generates a constraint reaching the second threshold, at the level of a detector 10 or 12, the latter will cancel the effects consecutive to the monitoring triggered by the first threshold, prevent the continuation of the ascent and authorize only the descent, the exit of the telescope 4 remaining of course impossible.
  • each of the distributors is associated with a device comprising a cylinder 13 separated into two chambers 14 and 15 by a central partition 16. Inside the cylinder 13 is mounted, axially movable, a rod 17 integral moving from the end 18 of the drawer of the control distributor concerned.
  • the displacement of the rod 17 must be able to be made in both directions from the neutral position (0) of the distributor drawer towards the positions of use (1) and (2).
  • the rod 17 On the side opposite the distributor, the rod 17 carries a stop constituted by a circlip 23, while on the distributor side it comprises a stop constituted by a shoulder 24.
  • each of these flanges is slidably mounted on the rod 17, and is in abutment on a stop that the latter presents, on the side of the distributor drawer for the flange 32, and on the cylinder side 13 for the flange 33.
  • Each of the two flanges 32 and 33 is therefore driven by the rod 17 only in one direction and in the direction of the other collar.
  • a helical spring 34 ensuring the return and the maintenance of the rod in the neutral position of the distributor drawer.
  • a latch 35 capable, depending on the direction in which the rod is moved, of actuating a contact 36 or 37.
  • the coil 45 of an electromagnet Inside the chamber 14 of the cylinder 13 is fixedly mounted the coil 45 of an electromagnet, with which is associated a tubular core 46 capable of sliding freely on the rod 17.
  • the assembly is carried out so that, when the coil 45 is not supplied, the distributor slide can be freely maneuvered from position (0) to position (2), as shown in FIG. 3.
  • the stop constituted by the circlip 23 comes to bear on the core 46.
  • the coil 45 is supplied and moves the tubular core 46 and consequently the rod 17 and the distributor drawer towards the right, bringing the dispenser drawer back to position (0) as shown in FIG. 4.
  • the end of displacement of the core 46 is obtained by pressing a part 47 of the latter in the form of a flange on the coil, this flange 47 being located between the central partition 16 and the coil 45.
  • a coil 48 with which is associated a tubular core 49 comprising a flange 50 located between the coil 48 and the central partition 16, the displacement of the core being from right to left and acting on the rod 17 by pressing it takes on the shoulder 24 to return the distributor valve 18 to position (0), when the pressure in the monitored jack reaches a dangerous value when the distributor is actuated in position (1).
  • the invention brings a great improvement to the existing technique by providing a safety device of simple design allowing direct use of electrical information, without transfer to a hydraulic circuit.
  • the cylinder 13 comprises a single chamber 14 near the two ends of which are formed openings 27 and 28 for supplying hydraulic fluid.
  • This chamber contains a double-acting piston 20 mounted floating and capable of sliding with seal both relative to the cylinder and relative to the rod 17 associated with the drawer 18 of the dispenser.
  • Circlips 23 and 24 are fixed on the rod 17 which can cooperate with the opposite face of the piston 20 to bring the distributor spool, respectively, from position (2) to position (0) and from position (1) to position (0).
  • This arrangement simplifies the manufacture of the safety device by reducing the number of moving parts and its size.
  • This arrangement is advantageous because it further reduces the number of parts and allows the safety device to be produced at the same time as that of the body of the dispenser. Because the bores are perfectly coaxial in the body of the distributor and in the safety device, it is possible to avoid a universal joint between the distributor drawer and the rod 17.
  • the electrical diagram shown in Figure 7 includes two supply lines, respectively A1, A2 and a return line A3.
  • This electrical circuit supplies in particular an EVS solenoid valve, as well as a two-threshold pressure detector bearing the respective references 51 and 52.
  • the distributor is associated with micro-contacts making it possible to detect the movement or movements in progress, two micro-contacts being provided for each movement of the cylinders V1 and V2 ensuring the pivoting of the arms. These micro-contacts are referenced a1, a2, ... d1, d2. A micro-contact is provided to detect each of the movements E and F, these micro-contacts being referenced respectively e and f.
  • micro-contacts a1, b1, c1, d1 are grouped together in the same assembly to form a power relay Rc abcd of the EVS solenoid valve.
  • the micro-contacts a1 and d1 on the one hand, and b1 and c1 on the other hand, are mounted in parallel so that, when performing a crossed movement at the level of the cylinders V1 and V2, the EVS solenoid valve is not supplied.
  • EVS is supplied by the line RD T2 and RD2T1, which is closed as well as by the relay Rc abcd which is closed insofar as there is no movement crossed AD, B C.
  • the pressure gauge 10 or 12 opens the contact 51 and deactivates the relay RD which, after time delay, will close RDT1, close RD1, open RD1, and open RDT2 after delay, the delay of RDT2 being equal to that of RDT1.
  • the EVS solenoid valve is no longer supplied and the system is under safety.
  • the contact 51 closes and replenishes the relay RD, which will open the contacts RD1 and RDT1 and de-energize the relay RD2.
  • the RD2 contact closes immediately, RD2T2 is kept closed during its time delay and the RAZRACM, RAZRABDM and RAZ-R ⁇ M memory relays are supplied.
  • the RDT2 contact closes immediately.
  • the RD2 relay being de-energized, the RD2T1 contact will close after time delay and supply EVS.
  • the system is booted up again.
  • the three relays RAZRACM, RAZRBCM, RAZREM in question, are the memory erasing relays of the relays RACM, RBDM and REM.
  • the memories of these three relays are intended to record and keep in permanent information the movement which caused the system to fail by reaching the first threshold. The erasure of the memory will only be obtained when RD is again energized, that is to say when the contact 51 is closed, the pressure having returned to below a critical value.
  • the erasing relays of the RAZRBDM and RAZREM memories can also be supplied by the RSI1 contact, when the second pressure threshold is used, the operation of which is explained below.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control And Safety Of Cranes (AREA)
EP81420036A 1980-03-21 1981-03-17 Système de sécurité pour appareil de levage à commande hydraulique Expired EP0037348B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420036T ATE14866T1 (de) 1980-03-21 1981-03-17 Sicherheitseinrichtung fuer eine hydraulisch arbeitende hebevorrichtung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8007238 1980-03-21
FR8007238A FR2478607A1 (fr) 1980-03-21 1980-03-21 Systeme de securite pour appareil de levage a commande hydraulique
FR8013018 1980-06-06
FR8013018A FR2483903A1 (fr) 1980-06-06 1980-06-06 Systeme de securite pour appareil de levage a commande hydraulique

Publications (3)

Publication Number Publication Date
EP0037348A2 EP0037348A2 (fr) 1981-10-07
EP0037348A3 EP0037348A3 (en) 1982-08-11
EP0037348B1 true EP0037348B1 (fr) 1985-08-14

Family

ID=26221696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420036A Expired EP0037348B1 (fr) 1980-03-21 1981-03-17 Système de sécurité pour appareil de levage à commande hydraulique

Country Status (5)

Country Link
US (1) US4411368A (da)
EP (1) EP0037348B1 (da)
DE (1) DE3171768D1 (da)
DK (1) DK128581A (da)
ES (1) ES8202316A1 (da)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534643B1 (fr) * 1982-10-15 1986-12-26 Bennes Marrel Dispositif controleur d'etat de charge avec limiteur de capacite de couple pour un circuit hydraulique, notamment sur une grue
GB2144098A (en) * 1983-07-30 1985-02-27 Simon Eng Dudley Ltd Hydraulically elevatable access equipment
GB8327848D0 (en) * 1983-10-18 1983-11-16 Aerial Access Equip Access equipment
US4787524A (en) * 1985-09-25 1988-11-29 National-Oilwell Overload protection system for a crane
AT388359B (de) * 1987-03-02 1989-06-12 Palfinger Fa Einrichtung zur steuerung eines hydraulisch betaetigten geraetes, insbesondere eines ladekrans
FR2677629B1 (fr) * 1991-06-17 1998-02-20 Senergy Sarl Procede de controle de la charge pour un engin de levage et dispositif pour sa mise en óoeuvre.
US5597080A (en) * 1994-08-02 1997-01-28 Kranco Crane Services, Inc. Snag load protection system for a crane
EP3549899A1 (en) * 2016-04-25 2019-10-09 Cargotec Patenter AB Hydraulic crane

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1135147B (de) * 1959-08-26 1962-08-23 Miag Muehlenbau & Ind Gmbh Sicherheitseinrichtung fuer Hebezeuge
DE1149150B (de) * 1959-10-28 1963-05-22 Demag Zug Gmbh Mobilkran mit einer UEberlastsicherung
DE1238170B (de) * 1964-11-25 1967-04-06 Miag Muehlenbau Einrichtung zum Sichern gegen UEberschreiten des zulaessigen Lastmomentes bei Kranenmit Auslegern
DE1275257B (de) * 1965-07-06 1968-08-14 Miag Muehlenbau & Ind Gmbh Sicherheitseinrichtung fuer Arbeitsgeraete, insbesondere Hebezeuge
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
SE346762C (sv) * 1970-11-04 1979-05-14 Hiab Foco Ab Sperr- och sekerhetsanordning vid hydrauliskt drivna kranar av vippkrantyp
US3792780A (en) * 1971-12-02 1974-02-19 Kidde & Co Walter Mechanism for positioning and restricting crane control levers to prevent dangerous load condition
DE2164628C3 (de) * 1971-12-24 1978-03-16 Siegfried Dipl.-Ing. Dr.-Ing. 4930 Detmold Gross Überlastabschalteinrichtung für hintereinandergekoppelte hydraulische Hubbzw. Verstellmechanismen
US3963127A (en) * 1972-05-02 1976-06-15 Hiab-Foco Aktiebolag Blocking arrangement in hydraulically operated cranes
GB1403046A (en) * 1972-09-08 1975-08-13 Weimar Kombinat Veb Load factor safety mechanism
DE2344168C3 (de) * 1973-09-01 1979-08-02 Krueger & Co Kg, 4300 Essen Einrichtung zur Sicherung eines Kranbetätigungsgestänges bei Überschreiten eines vorgegebenen maximalen Lastmomentes
DE2402033A1 (de) * 1974-01-17 1975-07-31 Siegfried Dipl Ing Dr In Gross Ueberlastabschalteinrichtung fuer einen auto-ladekran
US4027772A (en) * 1975-04-17 1977-06-07 Fulton Industries, Inc. Protective circuit for overload sensor
US4119118A (en) * 1977-01-13 1978-10-10 Walter Kidde & Company, Inc. Automatic machine motion restricting mechanism
US4170308A (en) * 1977-11-01 1979-10-09 Koehring Company Hydraulic function disconnect means
FR2418766A1 (fr) * 1978-03-01 1979-09-28 Michel Gutierrez Perfectionnement aux appareils de levage a commande hydraulique
FR2419899A1 (fr) * 1978-03-17 1979-10-12 Haulotte Arthur Dispositif de securite par arret de mouvement sur engin de levage
SE422315B (sv) * 1980-06-04 1982-03-01 Hiab Foco Ab Overlastskydd for hydrauliskt drivna kranar

Also Published As

Publication number Publication date
ES500544A0 (es) 1982-02-01
ES8202316A1 (es) 1982-02-01
DE3171768D1 (en) 1985-09-19
US4411368A (en) 1983-10-25
EP0037348A2 (fr) 1981-10-07
EP0037348A3 (en) 1982-08-11
DK128581A (da) 1981-09-22

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