EP2709944B1 - Telescopic arm for cranes and crane comprising said arm - Google Patents

Telescopic arm for cranes and crane comprising said arm Download PDF

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Publication number
EP2709944B1
EP2709944B1 EP12731655.2A EP12731655A EP2709944B1 EP 2709944 B1 EP2709944 B1 EP 2709944B1 EP 12731655 A EP12731655 A EP 12731655A EP 2709944 B1 EP2709944 B1 EP 2709944B1
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EP
European Patent Office
Prior art keywords
segments
segment
guide blocks
guide
telescopic arm
Prior art date
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EP12731655.2A
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German (de)
English (en)
French (fr)
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EP2709944A1 (en
Inventor
Mauro Marco CORTELLINI
Stefano Ferri
Paolo Dario MAINI
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CIFA SpA
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CIFA SpA
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes 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
    • B66C23/62Constructional features or details
    • B66C23/64Jibs
    • B66C23/70Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/707Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic guiding devices for telescopic jibs

Definitions

  • the present invention concerns a telescopic arm for cranes and crane comprising said arm.
  • cranes are work vehicles used to lift heavy loads, in the range of several tons, which generally comprise a truck on which a telescopic arm is mounted, consisting of a plurality of removable segments which can slide reciprocally one inside the other.
  • a hook, or other lifting mean is provided at an upper end of the arm, to lift the loads.
  • the arm can be angularly oriented, as well as lengthened telescopically, to carry the hook, or other lifting means, to the desired distance and height.
  • the telescopic segments are made of metal material, typically steel, and have a tubular shape with a cross section of different shapes, such as rectangular, rectangular with a rounded bottom, hexagonal or other.
  • the end part of each segment has reinforcement elements, of the band type, which also act as stopping means in a non-operative position.
  • the telescopic segments are guided with respect to each other by means of adjustable blocks made of a material able to absorb the local loads and to reduce the sliding friction.
  • the arm of the crane in question is both able to rotate around a vertical axis, and can also be inclined on a plane perpendicular to the support plane of the crane, being able to pass from a horizontal position to a substantially vertical or sub-vertical position.
  • Such cranes can be provided with stabilizer support elements, which determine a controlled lifting of the cranes with respect to the support plane, so that they are able to operate in conditions of substantial planarity.
  • ballasts can be provided which allow to balance and stabilize the crane, preventing it from toppling over.
  • the distances and height which can be reached are variable, as is the lifting capacity.
  • the distance which can be covered depends on the number of segments that make up the arm, and possibly also their length.
  • one disadvantage of known metal telescopic arms is that the weight of the arm increases as both the distance to be reached and the load to be lifted increase.
  • Document GB-A-2.207.109 describes a crane for lifting a light load, such as a cine or video camera.
  • the crane comprises a telescopic arm formed by sections made of composite material based on carbon fiber or aluminum or other composite materials or metal alloys.
  • the sections cooperate with each other in sliding by means of linear guide means that include rolling elements such as balls or cylinders interposed between each other.
  • GB-A-2.207.109 describes in detail movement means with a belt and pulley for the reciprocal telescopic sliding of the sections.
  • the function of the guide and rolling elements described in GB-A-2.207.109 is to promote the relative sliding of the sections, reducing friction, but the guide and rolling elements do not have any structural function or load supporting function.
  • Document FR-A-2.759.687 also describes a telescopic arm for a crane or fork lift truck.
  • the arm is formed by sections that slide with respect to each other, made of composite material or metal alloy.
  • FR-A-2.759.687 also provides guide blocks made of plastic material interposed in cooperation between the sections, with the sole function of facilitating the guided sliding of the sections and in any case disposed only at the four outer corners of the terminal ends of the sections, at head and tail.
  • the guide blocks are made of plastic, they do not provide any contribution in terms of mechanical resistance to the stresses deriving from the heavy load lifted and, in any case, given the special disposition of the blocks, only at head and tail of the sections, they do not guarantee an optimal distribution and support of the transverse loads acting on the sections.
  • Document EP-A-1.353.139 describes a system to detect damage to a lifting arm formed by sections that are telescopically mobile.
  • the arm is formed by sections that slide one with respect to the other, of which a first section made of composite material and sections made of metal material, of which a first metal section supports both the weight of the load, both of the second metal section and of the section made of composite material.
  • This solution does not provide, nor suggest, to reduce the weight of the telescopic arm, inasmuch as there is in any case a considerable contribution to said weight given by the metal section of the arm.
  • EP-A-1.353.139 also provides guide elements formed by strips of steel or hard plastic material, such as nylon, disposed along the edges, and sliding blocks, made of plastic material and interposed in cooperation between the sections, with the sole function of facilitating the guided sliding of the sections and in any case disposed only at the four outer corners of the terminal ends of the sections, at head and tail. Therefore, in this solution too, the guide elements and the sliding blocks do not provide any contribution in terms of mechanical resistance to the heavy load lifted and they do not guarantee an optimal distribution and support of the transverse loads acting on the sections.
  • document EP-A-0.117.774 describes a crane provided with a telescopic arm consisting of sliding sections.
  • Each section is formed by a multi-layer sandwich structure which includes two surface layers that cover an inner core, to which they are associated by adhesive means.
  • the central core is made of honeycomb plastic material or polyurethane foam, while the surface layers are made of composite material formed by plastic material reinforced with carbon fiber or aluminum alloy.
  • the sections are reciprocally guided by guide blocks and associated sliding elements which allow the sliding of plastic on plastic or plastic on metal, depending on the material they consist of.
  • this solution too provides elements and guides only for guiding, not specifically intended to support stresses, in particular stresses transverse to the sections, deriving from the weight of the load lifted.
  • Purpose of the present invention is therefore to achieve a telescopic arm for cranes which is both lighter than known telescopic arms and which allows, at the same time, to reach great distances, in any case guaranteeing robustness and mechanical resistance, both in the reciprocal coupling between the telescopic segments, particularly in the extended positions, and also in the overall capacity to lift heavy loads.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a telescopic arm according to the present invention can be used for a crane able to lift a heavy load.
  • the arm comprises a plurality of tubular segments which extend along a common central longitudinal axis.
  • Each of the segments is able to slide in a telescopic manner inside or outside another adjacent segment and consecutive along the central longitudinal axis, between a retracted position and a completely or partly extended position, to selectively determine one or more extended conditions of the arm.
  • each of the segments consists of a composite material with a base of reinforcement fibers and thermosetting resin.
  • the arm comprises longitudinal guide blocks or similar means, consisting of metal with high mechanical characteristics of robustness and disposed between one segment and at least another segment, adjacent and consecutive along the central longitudinal axis, which guide blocks are applied on corresponding internal surfaces of the at least one segment and external surfaces of the other segment.
  • the guide blocks develop continuously along the whole length of the corresponding segment on which they are applied, or discretely in correspondence with the usable work part of said length.
  • each of the guide blocks includes a first internal guide element disposed applied on the internal surface of the corresponding segment and a second external guide element disposed applied in a position coordinated with the corresponding first internal guide element, on the external surface of the corresponding other segment.
  • each first guide element has coupling means to cooperate directly in contact with mating coupling counter-means of the second guide element, both to guide the reciprocal sliding of the segments and to receive and support, directly on the metal of which the guide blocks are made and substantially along the whole length of the segments, the components of force transverse to the segments, due to the stresses deriving from the heavy load lifted by the arm.
  • the reciprocal cooperation between the metal guide elements of the telescopic sections allows to adequately support the transverse loads, which are generally not supported by the composite material as described above, thus achieving, overall, a less heavy structure compared with the state of the art.
  • the longitudinal guide blocks are advantageously made of metal resistant to wear caused by sliding, and preferably with high mechanical resistance.
  • longitudinal guide blocks to allow the reciprocal sliding of the telescopic sections, it is possible to use the arm both in the limit conditions of completely extended segments, or completely retracted, and also in intermediate positions.
  • the longitudinal guide blocks according to the present invention determine a distribution of the loads, in the working steps, in particular longitudinal loads on the composite material and transverse loads on the metal material of the guide blocks, which is favorable for the composite material, that is, a distribution of the loads that is parallel to the fibers of the material instead of perpendicular. Indeed, the component of stress in a transverse direction, not absorbed by the composite material, is discharged on the metal guide blocks.
  • the guide blocks are such as to allow the mutual sliding of the segments one inside the others telescopically, and also to transfer the loads to the structure in the direction of the fibers of the composite material.
  • the guide blocks are attached to the corresponding segments by gluing or by mechanical connection means.
  • the segments have a box-like section, defining, with respect to the component of the load raised perpendicular to the arm, upper or lower platbands and lateral flanks
  • the guide blocks may be disposed on one and/or the other of the upper or lower platbands and/or on one and/or the other of the lateral flanks.
  • the guide blocks may be provided, also more than one, on the corresponding platbands and/or on the lateral flanks.
  • the guide blocks may be disposed in combination both on the platbands and on the lateral flanks.
  • the box-like section is rectangular, rectangular with a rounded bottom, rectangular with rounded edges, hexagonal, oval or other.
  • the guide blocks may be disposed only on one lateral flank or on both lateral flanks.
  • the guide blocks may be disposed on one platband, upper or lower, or on both.
  • the guide blocks may be disposed on both lateral flanks and the upper and lower platbands.
  • Another variant provides, on one and/or the other of the lateral flanks and/or on one and/or the other of the platbands, a plurality of guide blocks associated in a longitudinal and/or transverse direction.
  • Providing the guide blocks on the lateral flanks is advantageous because it reduces the risks of jamming due to the flexional load which is discharged instead onto the platbands.
  • the composite material used to make the segments is based on carbon fibers.
  • the composite material used to make the segments is based on aramid fibers (Kevlar®), or other similar or comparable fibers, having characteristics substantially similar to carbon in terms of resistance and rigidity.
  • the composite material is made with unidirectional fibers, or, according to a variant, is made with interwoven and/or interlaced fibers, or fibers with a random distribution.
  • the composite material is made with a mixture of long fibers and short fibers, with a random or predetermined disposition.
  • the composite material used to make the tubular central part is the multi-layer type.
  • the use of composite material to make the telescopic arm of the crane in question allows to increase the length and/or the number of segments used given the same overall weight; alternatively, the invention allows to reduce the overall weight given the same length and/or number of segments.
  • Each segment of composite can be made as described in the European patent applications EP-B-1.970.344 and EP-B-2.039.498 and the Italian patent for industrial invention M12011A000273 in the name of the Applicant.
  • the arm according to the present invention could be made by providing terminal ends of the segments at least partly made of metal, as described in the Italian patent application in the name of the Applicant filed on the same day as the present application with application number MI2011A000856 and entitled "BRACCIO TELESCOPICO PER GRU E GRU COMPRENDENTE TALE BRACCIO".
  • the present invention also concerns a method to make a telescopic arm for a crane able to lift a heavy load and comprising a plurality of tubular segments which extend along a common central longitudinal axis, each of the segments being able to slide telescopically inside or outside another adjacent segment and consecutive along a central longitudinal axis, between a retracted position and a completely or partly extended position.
  • the method provides to make each of the segments consisting of a composite material based on reinforcement fibers and thermosetting resin and to dispose guide blocks between the at least one segment and at least another segment adjacent and consecutive along a central longitudinal axis, the guide blocks being applied on corresponding internal surfaces of the at least one segment and external surfaces of the other segment, to guide the reciprocal sliding thereof.
  • each of the guide blocks is obtained from a first internal guide element disposed applied on the internal surface of the corresponding segment and a second external guide element disposed applied in a position coordinated with the corresponding first internal guide element, on the external surface of the corresponding other segment.
  • Each first guide element is made with coupling means to cooperate directly in contact with mating coupling counter-means of the second guide element, both to guide the reciprocal sliding of the segments and to receive and support, directly on the metal of which the guide blocks are made and substantially along the whole length of the segments, the components of force transverse to the segments, due to the stresses deriving from the heavy load lifted by the arm.
  • One form of embodiment of the segments of the telescopic arm in question provides a first step in which a suitable quantity of layers of fiber which can already be impregnated or impregnated in a subsequent step, is deposited inside the volume of appropriate female molds.
  • An alternative form of embodiment provides a first step in which one or more layers of fiber are distributed, together with or without the resinous matrix (that is, pre-impregnated or dry fibers) on the external surface of a mold of the male type.
  • the method then provides a possible second step in which the composite material is subjected to a heat treatment process, typically in autoclave, a third step in which the necessary refining mechanical workings are carried out on the segment obtained, and a fourth step of applying and attaching the guide blocks on the internal and/or external surface of the segment obtained.
  • the production method of the composite telescopic arm is preferably selected between one or another of the techniques of filament winding, manual deposition of pre-pregs with polymerization in autoclave, poltrusion, hot vacuum, RTM (Resin Transfer Molding), the infusion technique or other similar or comparable method to one or another of the methods indicated above.
  • a telescopic arm according to the present invention is indicated with the number 10, and can be used in a crane for lifting loads, only schematically shown in fig. 1 , for example in the building or construction sector.
  • the telescopic arm 10 comprises a plurality of segments 12, 14, 16 sliding one inside the other, which can be extended linearly to assume an extended operating condition, or retracted one inside the other in a non-operative condition or when the machine is stopped, or to assume intermediate positions between the two limit positions.
  • the segments 12, 14, 16 have a box-like cross section, defining corresponding axial positioning seatings 25, 27 inside, to accommodate the segments in their retracted position.
  • the segments 12, 14, 16 have mating reciprocal section shape and size so as to be able to be inserted axially, where possible or required, in the respective axial positioning seatings 25, 27, according to the usual telescopic configuration.
  • the box-like cross section of the segments 12, 14, 16 also defines upper or lower platbands, that is, the surfaces of the segments that are transverse to the component of the load lifted perpendicular to the arm, and lateral flanks, that is, the surfaces of the segments that are parallel to the perpendicular component.
  • a telescopic arm 10 comprising:
  • At least one, advantageously each, of the segments 12, 14, 16 is made of composite material, in this case based on carbon fibers, which makes them much lighter than state-of-the-art segments.
  • the telescopic arm 10 comprises guide blocks or other equivalent means disposed between the segments 12, 14, 16 applied on the surfaces of direct cooperation of the segments 12, 14, 16, to facilitate the reciprocal sliding thereof ( figs. 2 , 3 and 4 ).
  • the guide blocks of the present invention determine a distribution of the loads, in the working steps, which is favorable for the composite material, that is, a distribution of the loads parallel, as indicated by the arrows D in figs. 3 and 4 , to the fibers of the material instead of perpendicular.
  • the guide blocks are made of metal material, such as for example a material based on steel or titanium or alloys thereof, or other equivalent material resistant to sliding wear.
  • the guide blocks may be provided along the whole length of the segments 12, 14, 16, or only on one part, advantageously the usable work part that affects the segments 12, 14, 16 in the various operating conditions.
  • the guide blocks 45 allow the segments 12, 14 to slide in the typical telescopic movement of the telescopic arm 10 of the crane in question.
  • the guide blocks 45 could be applied, also more than one, on only one or both of the lateral flanks of the segments 12, 14, 16, in correspondence with the shoulders connecting with the platbands, as in fig. 3 , or in correspondence with the central tract of the lateral flanks, as in fig. 4 , and/or in only one or both the lower and upper platbands.
  • One variant, not shown, may also provide a combination of guide blocks 45 disposed as in figs. 3 and 4 , that is, on the lateral flanks and also on the connecting shoulders between the lateral flanks and the platbands.
  • Each guide block 45 is attached to the corresponding segments 12, 14 by gluing or by mechanical coupling means, such as rivets or screws, of which an example is shown, indicated by the reference number 53 in figs. 3 and 4 .
  • Each guide block 45 is formed in this case by a first internal guide element 49 disposed applied on the internal surface 37 of the first segment 12 and a second external guide element 51 disposed applied on the external surface 36 of the second segment 14, coupled slidingly in a position coordinated with the corresponding first guide element 49.
  • first guide element 49 and the second guide element 51 of the guide block 45 are constrained to the respective segments 12 and 14, for example by a rivet 53.
  • the first guide element 49 has coupling means 59 configured to cooperate in guided sliding with mating coupling counter-means 61 of the second guide element 51.
  • the other blocks have a similar configuration, as can be seen for the part of a block 47 which has coupling means 63.
  • the coupling means 59, 63 can be the male type, comprising a tooth, a rib or other longitudinal protruding portion, and coordinately the coupling counter-means 61 of the second guide element 51 may be the female type, comprising a hollow, a groove or other longitudinal seating of mating sizes.
  • the coupling means 59, 63 can be the female type and the coupling counter-means 61 of the second guide element 51 can be the male type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP12731655.2A 2011-05-17 2012-05-17 Telescopic arm for cranes and crane comprising said arm Active EP2709944B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000862A ITMI20110862A1 (it) 2011-05-17 2011-05-17 Braccio telescopico per gru e gru comprendente tale braccio
PCT/IB2012/000963 WO2012156807A1 (en) 2011-05-17 2012-05-17 Telescopic arm for cranes and crane comprising said arm

Publications (2)

Publication Number Publication Date
EP2709944A1 EP2709944A1 (en) 2014-03-26
EP2709944B1 true EP2709944B1 (en) 2015-07-22

Family

ID=44554486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12731655.2A Active EP2709944B1 (en) 2011-05-17 2012-05-17 Telescopic arm for cranes and crane comprising said arm

Country Status (4)

Country Link
EP (1) EP2709944B1 (zh)
CN (1) CN103764542B (zh)
IT (1) ITMI20110862A1 (zh)
WO (1) WO2012156807A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20131680A1 (it) * 2013-10-11 2015-04-12 Cifa Spa Dispositivo ausiliario per una gru e gru comprendente tale dispositivo ausiliario
CN105540431A (zh) * 2016-01-27 2016-05-04 中船第九设计研究院工程有限公司 一种刚性伸缩套的海上起重机起升系统
US11795983B2 (en) 2017-06-30 2023-10-24 Zephyros, Inc. Pultruded telescoping arm device
IT201800020221A1 (it) * 2018-12-19 2020-06-19 Cifa Spa Braccio telescopico per gru e gru comprendente tale braccio
CN111173287B (zh) * 2020-03-10 2024-05-28 三一汽车制造有限公司 臂架和作业设备

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2539729A1 (fr) * 1983-01-21 1984-07-27 Creusot Loire Fleche telescopique de grue
FR2611826B1 (fr) * 1987-02-25 1989-06-16 Masseron Alain Bras telescopique pouvant etre concu sous forme demontable
GB2207109B (en) * 1987-02-25 1991-05-08 Alain Olivier Felix Masseron Telescoping crane
FR2759687B1 (fr) * 1997-02-14 1999-04-23 Fdi Sambron Patin de guidage pour fleche telescopique et fleche telescopique pourvue d'un tel guidade
US6786233B1 (en) * 2001-02-23 2004-09-07 Schwing America, Inc. Boom utilizing composite material construction
GB2387374B (en) * 2002-04-12 2005-03-02 Bamford Excavators Ltd Detecting damage to a structural member
ITUD20070056A1 (it) 2007-03-16 2008-09-17 Cifa Spa Braccio di distribuzione di calcestruzzo per veicoli da lavoro e relativo procedimento di fabbricazione
ITUD20070169A1 (it) 2007-09-19 2009-03-20 Cifa Spa Procedimento per la realizzazione di un braccio di distribuzione di calcestruzzo, e braccio cosi' ottenuto
IT1394350B1 (it) * 2009-05-06 2012-06-06 Milano Politecnico Braccio in materiale composito e relativo procedimento di realizzazione
CN201474312U (zh) * 2009-05-31 2010-05-19 长沙中联重工科技发展股份有限公司 混凝土布料臂架

Also Published As

Publication number Publication date
EP2709944A1 (en) 2014-03-26
ITMI20110862A1 (it) 2012-11-18
CN103764542A (zh) 2014-04-30
CN103764542B (zh) 2016-03-23
WO2012156807A1 (en) 2012-11-22

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