EP3722246A1 - Teleskopische kranauslegerabschnitt, teleskopisch ausfahrbarer kranausleger und hydraulikkran - Google Patents

Teleskopische kranauslegerabschnitt, teleskopisch ausfahrbarer kranausleger und hydraulikkran Download PDF

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Publication number
EP3722246A1
EP3722246A1 EP20163786.5A EP20163786A EP3722246A1 EP 3722246 A1 EP3722246 A1 EP 3722246A1 EP 20163786 A EP20163786 A EP 20163786A EP 3722246 A1 EP3722246 A1 EP 3722246A1
Authority
EP
European Patent Office
Prior art keywords
crane boom
wall portion
tubular beam
boom section
telescopic crane
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.)
Pending
Application number
EP20163786.5A
Other languages
English (en)
French (fr)
Inventor
Isak Bergner
Óscar Paseta Martinez
Joaquín Ferrer
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 AB
Original Assignee
Cargotec Patenter AB
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 Cargotec Patenter AB filed Critical Cargotec Patenter AB
Publication of EP3722246A1 publication Critical patent/EP3722246A1/de
Pending 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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic

Definitions

  • the present invention relates to a telescopic crane boom section.
  • the invention also relates to a telescopically extensible crane boom and a hydraulic crane.
  • An ordinary loader crane is provided with a crane boom system which normally comprises a first crane boom in the form of a so-called inner boom, which is articulately connected to a rotatable column of the crane, and a second crane boom in the form of a so-called outer boom, which is telescopically extensible and articulately connected to the inner boom.
  • the outer boom comprises a hollow base section, through which the outer boom is articulately connected to the inner boom, and telescopic crane boom sections, which are hollow and carried by the base section.
  • the telescopic crane boom sections are telescopically mounted to each other and displaceable in the longitudinal direction of the base section by means of hydraulic cylinders for adjustment of the extension length of the outer boom.
  • an additional crane boom in the following referred to as a jib, may be detachably mounted to the outer end of the outer boom.
  • the jib may be telescopically extensible and may comprise one or more telescopic crane boom sections of the above-mentioned type.
  • CA 2 697 304 A1 discloses a telescopic crane boom section produced in this manner, wherein CA 2 697 304 A1 teaches that a suitable location of the longitudinal welding joint is at the top or at the bottom of the crane boom section along the plane of symmetry.
  • the object of the present invention is to provide a telescopic crane boom section of a new and favourable design.
  • this object is achieved by means of a telescopic crane boom section having the features defined in claim 1.
  • the telescopic crane boom section of the present invention has an elongated main body in the form of a straight tubular beam that is formed by one single bent metal sheet and consists of several wall portions which are distributed about a longitudinal centre axis of the tubular beam and connected to each other via bending corners formed in the metal sheet, wherein:
  • the above-mentioned configuration of the telescopic crane boom section will not only result in a telescopic crane boom section of high strength, it also improves the reliability of the welding joint.
  • the conventional location of the welding joint is at the lower or upper end of the crane boom section for manufacturing reasons. Such a location of the welding joint implies that the welding joint will be positioned on the plane of symmetry, where the welding joint is affected by high stresses. At the upper end of the crane boom section the tensile stresses are high and at the lower end the compressive stresses are high. With such a conventional location of the welding joint, the requirements on the quality of the welding joint are therefore very high in order to achieve a reliable welding joint that can endure the stresses.
  • the welding joint located at a lateral wall portion that is intersected by the neutral layer, it will be possible to locate the welding joint rather close to the neutral layer, which implies reduced stresses on the welding joint as compared to the conventional location of the welding joint at the lower or upper end of the crane boom section.
  • planar upper and lower wall portions with an extension perpendicular to the vertical plane of symmetry will make it possible to arrange planar and horizontally extending sliding elements at the top and bottom of the crane boom section, wherein vertical loads on the crane boom section may be taken up by these horizontal sliding elements is an efficient and reliable manner, which in its turn creates opportunities for a high stiffness of a telescopic crane boom that is provided with crane boom sections according to the invention.
  • the horizontal sliding elements may co-operate with other planar sliding elements at inclined wall portions on either side of the upper and lower wall portions in order to distribute the local loads on the crane boom section in a suitable manner and thereby achieve a favourable stress distribution in the upper and lower parts of the crane boom section at the areas where the tubular beam makes contact with the sliding elements.
  • the telescopic crane boom section of the present invention may be produced in an efficient and cost-effective manner.
  • each one of said first and second lateral wall portions has a length that is 5-45% of the height of the tubular beam, as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam.
  • the welding joint is preferably located at a height above the lower wall portion that is 30-60% of the height of the tubular beam, as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam.
  • the invention also relates to a telescopically extensible crane boom having the features defined in claim 11 and a hydraulic crane comprising such a crane boom.
  • a hydraulic loader crane 1 according to an embodiment of the present invention is illustrated in Fig 1 .
  • the illustrated crane 1 comprises a crane base 2, which for instance may be connected to the chassis of a lorry. Adjustable support legs 3 for supporting the crane 1 are fixed to the crane base 2.
  • the crane 1 further comprises:
  • liftable and lowerable crane boom here refers to a crane boom which can be pivoted in a vertical plane so as to thereby perform liftings and lowerings of a load carried by the crane.
  • hydraulic cylinder for lifting and lowering the crane boom here refers to the hydraulic cylinder which is associated with the liftable and lowerable crane boom and which carries out the pivoting thereof in a vertical plane.
  • the outer boom 8 is telescopically extensible to enable an adjustment of the extension length thereof.
  • the outer boom 8 comprises a hollow base section 10, through which the outer boom 8 is articulately connected to the inner boom 6, and several hollow telescopic crane boom sections 11 which are carried by the base section 10 and displaceable in the longitudinal direction of the base section by means of hydraulic cylinders 12 for adjustment of the extension length of the outer boom 8.
  • an additional telescopically extensible crane boom in the form of a jib 15 is detachably and articulately connected to the outer boom 8 in such a manner that it is pivotable in relation to it about an essentially horizontal axis of rotation.
  • the hydraulic crane 1 further comprises a hydraulic cylinder 16 for lifting and lowering of the jib 15 in relation to the outer boom 8.
  • the jib 15 is telescopically extensible to enable an adjustment of the extension length thereof.
  • the jib 15 comprises a hollow base section 20, through which the jib 15 is articulately connected to the outer boom 8, and a hollow telescopic crane boom section 21 which is carried by the base section 20 and displaceable in the longitudinal direction of the base section by means of a hydraulic cylinder 22 for adjustment of the extension length of the jib 15.
  • FIG. 1 One of the telescopic crane boom sections 11 of the outer boom 8 shown in Fig 1 is illustrated in closer detail in Figs 2-3 .
  • the crane boom section 11 has an elongated main body in the form of a straight tubular beam 30 formed by one single metal sheet 31, preferably of steel, which is shaped by bending.
  • a collar 32 is mounted to the tubular beam 30 at a front end thereof, wherein the piston rod of the hydraulic cylinder 12 that is connected to the crane boom section 11 in order to effect an axial displacement thereof is fixed to the tubular beam 30 via the collar 32.
  • the tubular beam 30 consists of several wall portions W1-W12, which are distributed about a longitudinal centre axis of the tubular beam 30 and connected to each other via bending corners 33 (see Fig 3 ) formed in the metal sheet 31. Opposite longitudinal edges 34a, 34b of the metal sheet 31 are joined to each other by a welding joint 35, which extends in the longitudinal direction of the tubular beam 30.
  • the tubular beam 30 has a vertical plane of symmetry 36 (see Fig 3 ) as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam.
  • a neutral layer 37 of the tubular beam 30 extends across a first lateral wall portion W1 on a first side of the vertical plane of symmetry 36 and across an opposite second lateral wall portion W2 on the opposite side of the vertical plane of symmetry 36.
  • Each one of said first and second lateral wall portions W1, W2 preferably has a length L that is in the range of 5-45% of the height H of the tubular beam 30, as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam.
  • the first and second lateral wall portions W1, W2 are preferably parallel to each other and parallel to the vertical plane of symmetry 36, which implies that these wall portions W1, W2 are vertically arranged in the boom system.
  • the welding joint 35 is located at an upper edge 38 of the first lateral wall portion W1.
  • the welding joint 35 could be located at a lower edge 39 of the first lateral wall portion W1 or at the upper or lower edge 38, 39 of the second lateral wall portion W2.
  • the welding joint 35 is preferably located at a height h above the lower end of the tubular beam 30 that is in the range of 30-60%, preferably 35-50%, of the height H of the tubular beam, as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam.
  • the welding joint 35 may be produced by any suitable type of welding technique, such as for instance laser welding or arc welding.
  • the tubular beam 30 has a planar upper wall portion W3 at its top, wherein this upper wall portion W3 is perpendicular to the vertical plane of symmetry 36.
  • the upper wall portion W3 is horizontally arranged.
  • the upper wall portion W3 is connected to each one of said first and second lateral wall portions W1, W2 via one or more intermediate wall portions W4-W7, each of which being planar and inclined in relation to the vertical plane of symmetry 36.
  • the upper wall portion W3 is connected to the first lateral wall portion W1 via two intermediate wall portions W4, W5 and to the second lateral wall portion W2 via two opposite intermediate wall portions W6, W7.
  • Having two or more intermediate wall portions between the upper wall portion W3 and each lateral wall portion W1, W2 adds flexibility in the shaping of the crane boom section 11 to provide room for the hydraulic cylinders 12. Furthermore, it may also improve the resistance to buckling, owing to the fact that an increase of the number of intermediate wall portions will make it possible to reduce the length of each individual intermediate wall portion, as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam.
  • the tubular beam 30 also has a planar lower wall portion W8 at its bottom, wherein this lower wall portion W8 is perpendicular to the vertical plane of symmetry 36.
  • the lower wall portion W8 is horizontally arranged.
  • the lower wall portion W8 is connected to each one of said first and second lateral wall portions W1, W2 via one or more intermediate wall portions W9-W12, each of which being planar and inclined in relation to the vertical plane of symmetry 36.
  • the lower wall portion W8 is connected to the first lateral wall portion W1 via two intermediate wall portions W9, W10 and to the second lateral wall portion W2 via two opposite intermediate wall portions W11, W12.
  • the tubular beam 30 has a polygonal cross-sectional shape and it is preferably designed as a drop-shaped polygon, as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam, wherein a lower end of the drop-shaped polygon is wider than an upper end thereof.
  • the essentially drop-shaped cross-sectional shape of the tubular beam 30 is mainly achieved in that the inclined wall portions W5, W7 connected to the upper edges 38 of the first and second lateral wall portions W1, W2 are considerably longer than the inclined wall portions connected to the lower edges 39 of the first and second lateral wall portions W1, W2 and in that the inclined wall portions W4, W6 connected to the upper wall portion W3 are shorter than the inclined wall portions W9, W11 connected to the lower wall portion W8, as seen in a cross-section perpendicular to the longitudinal centre axis of the tubular beam.
  • the tubular beam 30 preferably has ten or more sides. In the embodiment illustrated in Figs 2 and 3 , the tubular beam 30 is twelve-sided.
  • the tubular beam 30 is ten-sided.
  • the lower wall portion W8 is connected to the first lateral wall portion W1 via one single intermediate wall portion W9 and to the second lateral wall portion W2 via an opposite intermediate wall portion W11.
  • Fig 4 illustrates how the tubular beam 30 of the crane boom section 11 illustrated in Figs 2 and 3 is telescopically mounted within a tubular beam 30' of another crane boom section 11 of corresponding design, wherein:
  • first, second and third sliding elements S1-S3 are fixed to the outer side of the inner tubular beam 30 at the rear end thereof and the other sliding elements S4-S8 are fixed to the inner side of the outer tubular beam 30' at the front end thereof.
  • the telescopic crane boom section 21 of the jib 15 shown in Fig 1 is designed in the same manner as the telescopic crane boom section 11 that has been described above with reference to Figs 2-5 .
EP20163786.5A 2019-04-08 2020-03-18 Teleskopische kranauslegerabschnitt, teleskopisch ausfahrbarer kranausleger und hydraulikkran Pending EP3722246A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1950438 2019-04-08

Publications (1)

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EP3722246A1 true EP3722246A1 (de) 2020-10-14

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EP20163786.5A Pending EP3722246A1 (de) 2019-04-08 2020-03-18 Teleskopische kranauslegerabschnitt, teleskopisch ausfahrbarer kranausleger und hydraulikkran

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EP (1) EP3722246A1 (de)
AT (1) AT17304U1 (de)
DE (1) DE202020101893U1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI26016A (sl) * 2020-06-19 2021-12-31 Tajfun Liv, Proizvodnja In Razvoj D.O.O. Nosilni sklop teleskopskega kraka pri mobilnem hidravličnem dvigalu in mobilno hidravlično dvigalo, obsegajoče tovrsten sklop

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6098824A (en) * 1997-03-12 2000-08-08 Mannesmann Ag Telescopic crane boom section and a process for making sure
EP1302435A1 (de) * 2001-10-16 2003-04-16 EFFER S.p.A. Hochfester teleskopischer Ausleger
CA2697304A1 (en) 2007-09-05 2009-03-12 Palfinger Ag Profile shape for a crane boom
EP2363214A1 (de) * 2010-03-02 2011-09-07 Ferro Umformtechnik GmbH & Co. KG Verfahren zur Herstellung eines geschweissten Hohlprofils sowie geschweisstes Hohlprofil
CN108033369A (zh) * 2017-11-29 2018-05-15 太原重工股份有限公司 伸缩臂和包括这种伸缩臂的起重机

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6098824A (en) * 1997-03-12 2000-08-08 Mannesmann Ag Telescopic crane boom section and a process for making sure
EP1302435A1 (de) * 2001-10-16 2003-04-16 EFFER S.p.A. Hochfester teleskopischer Ausleger
CA2697304A1 (en) 2007-09-05 2009-03-12 Palfinger Ag Profile shape for a crane boom
EP2363214A1 (de) * 2010-03-02 2011-09-07 Ferro Umformtechnik GmbH & Co. KG Verfahren zur Herstellung eines geschweissten Hohlprofils sowie geschweisstes Hohlprofil
CN108033369A (zh) * 2017-11-29 2018-05-15 太原重工股份有限公司 伸缩臂和包括这种伸缩臂的起重机

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Publication number Publication date
AT17304U1 (de) 2021-09-15
DE202020101893U1 (de) 2020-04-29

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