EP2025637A1 - Verfahren und Vorrichtung zum leichteren Einstellen der freien Drehfunktion eines Turmkrans bei starkem Wind - Google Patents

Verfahren und Vorrichtung zum leichteren Einstellen der freien Drehfunktion eines Turmkrans bei starkem Wind Download PDF

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Publication number
EP2025637A1
EP2025637A1 EP08356064A EP08356064A EP2025637A1 EP 2025637 A1 EP2025637 A1 EP 2025637A1 EP 08356064 A EP08356064 A EP 08356064A EP 08356064 A EP08356064 A EP 08356064A EP 2025637 A1 EP2025637 A1 EP 2025637A1
Authority
EP
European Patent Office
Prior art keywords
crane
rotating part
brake
wind
torque
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
EP08356064A
Other languages
English (en)
French (fr)
Other versions
EP2025637B1 (de
Inventor
Bernard Le Gourierec
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.)
Manitowoc Crane Group France SAS
Original Assignee
Manitowoc Crane Group France SAS
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Filing date
Publication date
Application filed by Manitowoc Crane Group France SAS filed Critical Manitowoc Crane Group France SAS
Publication of EP2025637A1 publication Critical patent/EP2025637A1/de
Application granted granted Critical
Publication of EP2025637B1 publication Critical patent/EP2025637B1/de
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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
    • B66C15/00—Safety gear
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/26—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 specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
    • 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
    • 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
    • B66C23/94—Safety gear for limiting slewing movements

Definitions

  • the present invention relates, in general, to the technical field of tower cranes. More particularly, this invention is directed to a method and apparatus for facilitating the weathering of a tower crane in a disturbed wind.
  • a tower crane is usually composed of two main parts, which are on the one hand a non-rotating vertical pylon also designated as mast, and on the other hand a rotating part composed of an arrow and a counter-beam equipped with a ballast, the rotating part being mounted at the top of the mast being made orientable about a vertical axis.
  • an orientation ring comparable to a large ball bearing, which is composed of two concentric rings, including a fixed ring connected to the top of the mast and a movable ring connected to the rotating part, rings between which cylindrical balls or rollers roll.
  • an electric gear motor integral with this rotating part rotates a pinion, which meshes with a toothed wheel cut into the fixed ring of the ring gear. If the power to be transmitted to rotate the rotating part is too important for a single motor, two or more geared motors can be mounted on the rotating part.
  • the ring is designed to allow rotation of the rotating part with minimal drive torque; nevertheless, it is necessary to exert between the considered parts of the crane a sufficient torque to overcome the friction of the balls or rollers interposed between the fixed ring and the movable ring of the crown.
  • the friction torque of the crown is here designated by Ccou.
  • the orientation geared motor has a brake composed of: an electromagnet, a spring, a plate movable in translation and fixed in rotation, provided with a coating of material with a high coefficient of friction, and a turntable connected to the motor shaft.
  • a brake composed of: an electromagnet, a spring, a plate movable in translation and fixed in rotation, provided with a coating of material with a high coefficient of friction, and a turntable connected to the motor shaft.
  • the coil of the electromagnet is not electrically powered, and the movable plate exerts via the spring a pressure on the turntable, so a braking torque on the geared motor .
  • the electromagnet attracts the mobile plate by compressing the spring, which frees the turntable which can then rotate freely.
  • the setting of the spring that is to say the force it exerts according to the displacement it undergoes, makes it possible to adjust the braking torque as well as exerted on the mechanism of orientation of the crane.
  • orientation geared motors at least one of them is equipped with such a brake.
  • tower cranes are usually put in wind vane, that is to say that we let the rotating part to move freely according to the wind direction in which case the counterfleche is placed against the wind and the arrow is moving in the direction of the wind.
  • the weather vane crane ensures stability when exposed to storm winds, that is to say winds above the speed limit V1 previously mentioned.
  • French patent FR 2135689 describes such a brake and its control suitable for the weather vane of a tower crane.
  • the speed of the wind striking the counterfleche can be very different from the speed of the wind simultaneously striking the boom.
  • the difference between the torque applied to the boom and the torque applied to the counterfleche then becomes much greater than the friction torque of the crown, so that the rotating part of the crane, instead of getting into the wind bed, is to turn in a certain direction, without stopping.
  • the crane fails to prop up properly, and its rotating part is driven in an uncontrolled rotation. Under such conditions, there is a risk of falling of the crane, especially if a gust of wind hits the rotating part when it is oriented perpendicular to the direction of the wind.
  • Such disturbed conditions may occur, in particular, if the crane is installed in an urban environment that creates an influence of neighboring buildings, or near a cliff, or in a valley, or near central cooling towers. electric, etc.
  • the present invention therefore aims to prevent the uncontrolled rotation of the rotating part of a tower crane, when it is installed on a site subject to disturbed winds, corresponding in particular to the implantations previously listed, this for avoid any risk of falling of the crane, the proposed solution consisting of an improved control of the crane's weather vane.
  • the idea underlying the invention is to avoid the uncontrolled rotation of the rotating part of the tower crane, limiting the speed of winding of this rotating part by a specific braking system entering into action only when the crane is put out of service, and then creating a permanent braking torque, which opposes a possible significant difference in torque between the boom and the counterflash.
  • the device of the invention consists of a rotation mechanism of which the orientation geared motor, or at least one of the geared motors, is equipped with a specific brake which controls the setting wind vane, for example by slowing down from a wind speed of 55 km / h, which in all cases must be less than the maximum speed allowed for the work of the crane.
  • the additional brake activated when the crane is put into service to exert the braking torque Cfr 2 is an external brake, interposed between the output of the reduction gear of the geared motor, on the one hand, and a pinion which is in taken with a gear wheel of the slewing ring, on the other hand.
  • only one of these geared motors of the rotation mechanism comprises an internal brake deactivated when the crane is put out of service, and at least one other geared motor orientation of the same rotation mechanism comprises the aforesaid brake which is activated when the crane is put out of service, the latter brake then exerting the braking torque Cfr 2 .
  • This solution can avoid the use of an external brake, the unused brake of one of the orientation geared motors being used to brake the rotating part in order to control the wind vane, according to the method of the invention.
  • the rotating part 2 of a tower crane consists of an arrow 3 and a counter-flange 4, aligned on either side of an orientation ring 5 of vertical axis which overcomes the vertex 6 of the mast (not shown itself) of the crane.
  • the ring 5 itself consists of two rings, a fixed ring connected to the top 6 of the mast, and a movable ring connected to the rotating part 2, the fixed ring forming an outer gear 7.
  • An electric geared motor 8, secured of the rotating part 2 is coupled to a pinion 9 of vertical axis, which meshes with the toothed wheel 7.
  • the geared motor 8 comprises an electric motor 10, a gear reducer 11 and an internal brake 12, which is automatically actuated when the motor 10 is not powered, but is disabled when the crane is not in use.
  • an external additional brake 13 is interposed between the output of the gearbox 11 and the pinion 9 which is in engagement with the toothed wheel 7 of the ring gear 5.
  • This external brake 13 comes into action only when the crane is set out of order, to exercise a minimal braking torque on the rotating part 2, and thus avoid an uncontrolled weather vane in case of disturbed wind.
  • the crane operator puts the crane in a wind vane by disabling the internal brake 12 of the geared motor 8 and then activating the external brake 13 to allow it to exert its braking torque.
  • a Ccou friction torque is to be considered at the orientation ring 5 of the rotating part 2.
  • the internal brake 12 must take the difference in torque between arrow 3 and counterflash 4, taking into account the friction torque, up to a maximum wind speed V1 defined by the standards, for example a speed of 72 km / h.
  • V1 a maximum wind speed defined by the standards
  • the braking torque Cfr 1 for such a wind speed V1 torque to be exerted by this brake 12, must satisfy the relation: cf. 1 > cfl 1 - ccf 1 - Ccou in which Cfl 1 and Ccf 1 represent the couples applied by a wind of speed V1 respectively to the arrow 3 and to the counterfleche 4.
  • the wind speed V2 is for example equal to 55 km / h (whereas, in the case taken here for example, the speed V1 is equal to 72 km / h).
EP08356064A 2007-08-10 2008-04-24 Verfahren und Vorrichtung zum leichteren Einstellen der freien Drehfunktion eines Turmkrans bei starkem Wind Active EP2025637B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0705817A FR2919853B1 (fr) 2007-08-10 2007-08-10 Procede de dispositif pour faciliter la mise en girouette d'une grue a tour dans un vent perturbe

Publications (2)

Publication Number Publication Date
EP2025637A1 true EP2025637A1 (de) 2009-02-18
EP2025637B1 EP2025637B1 (de) 2010-05-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08356064A Active EP2025637B1 (de) 2007-08-10 2008-04-24 Verfahren und Vorrichtung zum leichteren Einstellen der freien Drehfunktion eines Turmkrans bei starkem Wind

Country Status (3)

Country Link
EP (1) EP2025637B1 (de)
DE (1) DE602008001337D1 (de)
FR (1) FR2919853B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2123592A1 (de) 2008-05-21 2009-11-25 Manitowoc Crane Group France Device for weathervaning a tower crane
CN103663214A (zh) * 2012-09-24 2014-03-26 比伯拉赫利勃海尔-维克股份有限公司 起重机
WO2016146827A1 (de) 2015-03-19 2016-09-22 Gbf Gesellschaft Für Bemessungsforschung Mbh Drehkran und verfahren zum ausrichten eines drehkrans

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018127783A1 (de) 2018-11-07 2020-05-07 Liebherr-Werk Biberach Gmbh Kran sowie Verfahren zum Windfreistellen eines solchen Krans

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956882C (de) * 1954-03-25 1957-01-24 Demag Zug Gmbh Drehwerksbremse fuer Drehkrane, insbesondere Turmdrehkrane
FR2135689A5 (de) 1971-03-09 1972-12-22 Potain Sa
EP1422188A1 (de) * 2002-11-21 2004-05-26 Liebherr-Werk Biberach GmbH Drehwerksbremse eines Krandrehwerks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE956882C (de) * 1954-03-25 1957-01-24 Demag Zug Gmbh Drehwerksbremse fuer Drehkrane, insbesondere Turmdrehkrane
FR2135689A5 (de) 1971-03-09 1972-12-22 Potain Sa
EP1422188A1 (de) * 2002-11-21 2004-05-26 Liebherr-Werk Biberach GmbH Drehwerksbremse eines Krandrehwerks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MARTIN SCHEFFLER, KLAUS FEYRER, KARL MATTHIAS: "Fördermaschinen - Hebezeuge, Aufzüge, Flurförderzeuge", 1998, VIEWEG, XP002462250 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2123592A1 (de) 2008-05-21 2009-11-25 Manitowoc Crane Group France Device for weathervaning a tower crane
CN103663214A (zh) * 2012-09-24 2014-03-26 比伯拉赫利勃海尔-维克股份有限公司 起重机
US9327950B2 (en) 2012-09-24 2016-05-03 Liebherr-Werk Biberach Gmbh Crane
WO2016146827A1 (de) 2015-03-19 2016-09-22 Gbf Gesellschaft Für Bemessungsforschung Mbh Drehkran und verfahren zum ausrichten eines drehkrans
DE102015104148A1 (de) 2015-03-19 2016-09-22 Gbf Gesellschaft Für Bemessungsforschung Mbh Drehkran und Verfahren zum Ausrichten eines Drehkrans

Also Published As

Publication number Publication date
FR2919853B1 (fr) 2009-09-18
FR2919853A1 (fr) 2009-02-13
DE602008001337D1 (de) 2010-07-08
EP2025637B1 (de) 2010-05-26

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