EP0873935A2 - Elastically active guiding system between stuctural bodies in relative movement - Google Patents

Elastically active guiding system between stuctural bodies in relative movement Download PDF

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Publication number
EP0873935A2
EP0873935A2 EP98105270A EP98105270A EP0873935A2 EP 0873935 A2 EP0873935 A2 EP 0873935A2 EP 98105270 A EP98105270 A EP 98105270A EP 98105270 A EP98105270 A EP 98105270A EP 0873935 A2 EP0873935 A2 EP 0873935A2
Authority
EP
European Patent Office
Prior art keywords
relative movement
structural bodies
structural
guiding system
coaxial
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Withdrawn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
EP98105270A
Other languages
German (de)
English (en)
French (fr)
Inventor
Paolo Vielmo
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.)
Tecnomare SpA
Original Assignee
Tecnomare SpA
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 Tecnomare SpA filed Critical Tecnomare SpA
Publication of EP0873935A2 publication Critical patent/EP0873935A2/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/507—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets

Definitions

  • the present invention relates to a guiding system between structural bodies in relative movement, in particular between structural bodies subjected to relative rotations, preferably in floating plants in the open sea where a ship, firmly positioned, or sailing off-shore, is free to move around a towered structure, or various kinds of operating structures necessary for operations in the open sea.
  • the guiding system is inserted in rotating supports of bodies with large dimensions, in particular for mooring towers and bodies of structures of floating means for the production of hydrocarbons.
  • bodies of large dimensional structures there is the problem of coupling two bodies moving in relative rotation, in particular bodies of large dimensional structures.
  • This natant can have any shape and dimension and will be simply called, using interchangeable terms, natant, or ship, or tanker, in the present description and claims.
  • Floating plants are known, whose supporting structure and rotating guides of structural bodies having large dimensions such as cylindrical mooring towers, lifting cranes, pipe launching towers, or cables are at present accomplished by means of a combination of devices and units which create a rotating constraint by reacting to axial and/or radial forces and capsizing conditions.
  • the tower is a cylindrical body of large dimensions equipped with an axialsymmetrical structure having a relatively high rigidity which is housed, in most applications, in a cylindrical cavity of the ship, situated in its plane of symmetry; this cylindrical cavity is influenced by the stress conditions of the ship and the radial dimension and planarity of the supporting bases of the tower can vary even by several centrimetres, in relation to the maximum flexural stress to which it is subjected as a result of the undulating movement and load distribution on the ship.
  • Another objective of the present invention relates to the absence of mechanically sealed units in relation to a chemically aggressive sea environment.
  • the guiding system between structural bodies in relative movement of the present invention which consists of at least two substantially coaxial and interfacing guiding elements which form a single body with at least one inserted element made of an elastically active material, and the coaxial guides themselves which are coupled with at least two sliding tracks, of which at least one track is joined to a structural body and the other track to the other structural body and these sliding tracks face each other in an axially offset position.
  • the element made of an elastically active material consists of a rubber disk, or made of an elastomeric material, fixed by vulcanization, or with similar methods, to the coaxial and interfacing guiding elements.
  • This guiding system between structural bodies in movement is also characterized in that the element made of an elastically active material is a single axialsymmetrical composite block of several alternating metallic disks and disks of an elastically active material.
  • this axialsymmetrical block made of an elastically active material is an axialsymmetrical hollow block subjected externally to force on the part of a rigid, suitably shaped, coupled circular gear and internally to a counterforce action on the part of a hub with a shape similar to that of the above circular gear, but with axially offset profiles with respect to each other to allow operating elastic deformation to compensate the relative movements of the functinally associated structural bodies.
  • these coaxial guiding elements and sliding tracks of the guiding system of the present invention are made of metal or a rigid polymeric material with a high resistance to specific pressure.
  • the guiding system between the structural bodies 1 and 2 in relative movement according to arrows 8 and 9 comprise guiding elements 6 and 7, preferably steel metal disks, which are coupled with the sliding tracks 3 and 4; the latter are preferably in the form of steel metal rails. More specifically, rail 3 is joined, as a single body, to the structural body 1, whereas rail 4 is joined, as a single body, to the structural body 2.
  • These guiding disks 6 and 7 face each other and are joined by disk 5 made of an elastically active material, preferably rubber fixed by vulcanization to the metal guiding disks 6 and 7.
  • the rubber disk 5 is in the form, advantageous for sudden forceful thrusts, of a hollow axialsymmetrical block in which there are alternating rubber disks 5 and metal, preferably steel, disks 12.
  • the block becomes a single body between the rubber disks 5 and the steel disks 12, by means of a vulcanization process, and is externally coupled with the circular geared guide 11, which operatively acts on rail 3, and is also internally coupled with the hub 10, advantageously shaped and preferably made of steel.
  • the profile of the circular gear 11 has basically the same size and shape as the profile of the device 10 but these profiles are axially offset by half a pitch to allow elastic deformability upon thrusts activated by the relative movement of the structural bodies 1 and 2, as is clearly illustrated in figure 4.
  • Each rubber disk 5 assumes a sloping configuration, as it is subjected to shear stress and its relative deformation is not hindered as it adapts itself to the profiles appropriately produced and positioned on the internal surface of the rigid circular gear 11 and on the external surface of the steel hub 10.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Transmission Devices (AREA)
  • Springs (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Vehicle Body Suspensions (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
EP98105270A 1997-04-22 1998-03-24 Elastically active guiding system between stuctural bodies in relative movement Withdrawn EP0873935A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI970937 1997-04-22
IT97MI000937A IT1291631B1 (it) 1997-04-22 1997-04-22 Sistema di guida elasticamente attivo tra corpi di struttura in movimento relativo

Publications (1)

Publication Number Publication Date
EP0873935A2 true EP0873935A2 (en) 1998-10-28

Family

ID=11376992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98105270A Withdrawn EP0873935A2 (en) 1997-04-22 1998-03-24 Elastically active guiding system between stuctural bodies in relative movement

Country Status (4)

Country Link
EP (1) EP0873935A2 (enrdf_load_stackoverflow)
BR (1) BR9801424A (enrdf_load_stackoverflow)
IT (1) IT1291631B1 (enrdf_load_stackoverflow)
NO (1) NO981771L (enrdf_load_stackoverflow)

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
ITMI970937A1 (it) 1998-10-22
IT1291631B1 (it) 1999-01-11
ITMI970937A0 (enrdf_load_stackoverflow) 1997-04-22
BR9801424A (pt) 1999-05-04
NO981771D0 (no) 1998-04-21
NO981771L (no) 1998-10-23

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