EP3336043B1 - Hydraulikkran - Google Patents

Hydraulikkran Download PDF

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Publication number
EP3336043B1
EP3336043B1 EP16204799.7A EP16204799A EP3336043B1 EP 3336043 B1 EP3336043 B1 EP 3336043B1 EP 16204799 A EP16204799 A EP 16204799A EP 3336043 B1 EP3336043 B1 EP 3336043B1
Authority
EP
European Patent Office
Prior art keywords
crane
boom
hydraulic
column
link
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.)
Active
Application number
EP16204799.7A
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English (en)
French (fr)
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EP3336043A1 (de
Inventor
Jon SKAGERSTEN
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.)
Cargotec Patenter AB
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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
Priority to EP16204799.7A priority Critical patent/EP3336043B1/de
Priority to DK16204799.7T priority patent/DK3336043T3/da
Priority to CN201780077798.1A priority patent/CN110049940B/zh
Priority to PCT/EP2017/080739 priority patent/WO2018108523A1/en
Publication of EP3336043A1 publication Critical patent/EP3336043A1/de
Application granted granted Critical
Publication of EP3336043B1 publication Critical patent/EP3336043B1/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
    • 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
    • B66C23/54—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 with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors

Definitions

  • the present invention relates to a hydraulic crane according to the preamble of claim 1.
  • a hydraulic crane for instance in the form of a lorry crane or forestry crane, often comprises a column, which is rotatable about a vertical axis of rotation, and a crane boom system, which is mounted to the column and which is intended to carry a load in a load suspension point at an outer end of the crane boom system, wherein the crane boom system comprises two or more liftable and lowerable crane booms which form a connection between the load suspension point and the column and which are articulately connected to each other.
  • liftable and lowerable crane boom 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.
  • FIGs 1-4 A previously known hydraulic crane according to the preamble of claim 1 is illustrated in Figs 1-4 .
  • This crane comprises a first crane boom 1 in the form of a so-called inner boom, which is articulately connected to a rotatable column 2, and a second crane boom 3 in the form of a so-called outer boom, which is telescopically extensible and articulately connected to the inner boom 1, wherein the inner boom is 1 pivotable in relation to the column 2 by means of a first hydraulic cylinder 4 in the form of a so-called lifting cylinder and the outer boom 3 is pivotable in relation to the inner boom 1 by means of a second hydraulic cylinder 5 in the form of a so-called outer boom cylinder.
  • the upper end of the lifting cylinder 4 of the crane illustrated in Figs 1-4 is connected to the inner boom 1 through a first link 6 and to the column 2 through a second link 7, wherein each one of these links 6, 7 comprises two arms arranged in parallel with each other.
  • the first and second links 6, 7 effect an automatic modification of the point of application of the lifting force exerted by the lifting cylinder 4 as the piston rod of the lifting cylinder is extended and they thereby influence the lever arm of the lifting force exerted by the lifting cylinder 4 in such a manner that the lifting moment of the crane becomes more uniform throughout the angular range of the inner boom 1.
  • the previously known crane illustrated in Figs 1-4 is a foldable knuckle boom crane where the inner and outer booms 1, 3 are foldable into a compact parking position when the crane is to be transported or stored, as illustrated in Fig 1 .
  • the outer boom 3 is first pivoted downwards in relation to the inner boom 1 in order to reduce the angle between the outer and inner booms as much as possible (see Fig 4 ), whereupon the inner boom 1 is pivoted downwards in relation to the column 2 in order to reduce the angle between the inner boom 1 and the column 2 as much as possible and make the crane assume its final parking position (see Fig 1 ) with the outer boom 3 in an upwardly inclined position at the side of the column 2.
  • the crane may subsequently be moved from the parking position to the working position by performing these movements of the inner and outer booms 1, 3 in the opposite order.
  • a hydraulic crane according to the preamble of claim 1 is also previously known from EP 1 580 159 A1 .
  • the object of the present invention is to achieve a further development of a hydraulic crane of the above-mentioned type so as to provide a hydraulic crane that is improved in at least some aspect.
  • the hydraulic crane of the present invention comprises:
  • the inner end of the second hydraulic cylinder is connected to the first crane boom through the above-mentioned first link, wherein the first link is articulately connected to the inner end of the second hydraulic cylinder by a third joint.
  • the first link is configured to mechanically guide the third joint in an arcuate path about the second joint when the first crane boom is pivoted about said second axis of rotation under the effect of the first hydraulic cylinder.
  • the first link will consequently effect an automatic movement of the inner end of the second hydraulic cylinder in relation to the first crane boom when the first crane boom is pivoted in relation to the column, which will give certain advantages as explained in closer detail in the description following below.
  • a hydraulic crane 10 according to different embodiments of the present invention is illustrated in Figs 5-16 .
  • the crane 10 is for instance a lorry crane or forestry crane.
  • the crane 10 is mounted on a frame 11, which for instance may be connected to the chassis of a lorry or a forestry vehicle.
  • the frame 11 may be provided with adjustable support legs (not shown) for supporting the crane 10.
  • the crane 10 comprises:
  • the lifting cylinder 16 comprises a cylinder part 16a which is articulately connected to the column 13, and a piston which is received in the cylinder part 16a and displaceable in relation to it, wherein the piston is fixed to a piston rod 16b which is articulately connected to the inner boom 15 through a link system 20.
  • the outer boom cylinder 18 has an inner end facing the column 13 and an opposite outer end facing the outer boom 17.
  • the outer boom cylinder 18 comprises a cylinder part 18a which is articulately connected to the inner boom 15 through the link system 20, and a piston which is received in the cylinder part 18a and displaceable in relation to it, wherein the piston is fixed to a piston rod 18b which is articulately connected to the outer boom 17.
  • the piston rod 18b of the outer boom cylinder is articulately connected directly to the outer boom 17 by a joint 21 provided on the outer boom.
  • the piston rod 18b of the outer boom cylinder may be articulately connected to the outer boom 17 through a link system 22 of conventional type, as illustrated in Fig 15 .
  • the outer boom 17 is telescopically extensible to enable an adjustment of the extension length thereof.
  • the outer boom 17 comprises a base section 17a, through which the outer boom 17 is articulately connected to the inner boom 15, and several telescopic crane boom sections 17b which are carried by the base section 17a and displaceable in the longitudinal direction of the base section by means of hydraulic cylinders 23 for adjustment of the extension length of the outer boom 17.
  • a load handling tool (not shown) is to be mounted to the outer end of the outer boom 17.
  • the above-mentioned link system 20 at the upper end of the lifting cylinder 16 comprises a first link 24, through which the upper end of the lifting cylinder 16, i.e. in the illustrated example the upper end of the piston rod 16b, is connected to the inner boom 15.
  • the first link 24 is articulately connected to the upper end of the lifting cylinder 16 by a first joint J1, which forms an essentially horizontal axis of rotation, and articulately connected to the inner boom 15 by a second joint J2, which forms another essentially horizontal axis of rotation that extends in parallel with the axis of rotation formed by said first joint J1.
  • the first link 24 is articulately connected to the inner end of the outer boom cylinder 18, i.e.
  • the first link 24 is arranged to form a connection between the upper end of the lifting cylinder 16, the inner end of the outer boom cylinder 18 and the inner boom 15.
  • the inner boom 15 has a U-shaped cross-sectional shape with a downwardly facing opening.
  • An upper end of the first link 24 is received in an inner space of the inner boom 15 between the opposite lateral walls of the inner boom, wherein the first link 24 extends through a downwardly facing opening between these lateral walls.
  • the link system 20 also comprises a second link 25, which is arranged to form a connection between the upper end of the first hydraulic cylinder 16 and the column 13 or between the first link 24 and the column 13.
  • the second link 25 forms a connection between the upper end of the lifting cylinder 16 and the column 13.
  • the second link 25 is at a first end articulately connected to the upper end of the lifting cylinder 16 by the above-mentioned first joint J1 and at an opposite second end articulately connected to the column 13 by another joint J5, which forms an essentially horizontal axis of rotation that extends in parallel with the axis of rotation formed by the first joint J1.
  • the second link 25 forms a connection between the first link 24 and the column 13.
  • the second link 25 is at a first end articulately connected to the first link 24 by a fourth joint J4, which forms an essentially horizontal axis of rotation that extends in parallel with the axis of rotation formed by the first joint J1, and at an opposite second end articulately connected to the column 13 by another joint J5, which forms an essentially horizontal axis of rotation that extends in parallel with the axis of rotation formed by the fourth joint J4.
  • the fourth joint J4 is located on the first link 24 between the first and second joints J1, J2.
  • the second link 25 comprises two link elements which are arranged in parallel with each other on opposite sides of the column 13.
  • the first link 24 is configured to mechanically guide the third joint J3 in an arcuate path 26 (see Figs 10 and 11 ) about the second joint J2 when the inner boom 15 is pivoted in relation to the column 13 about the second axis of rotation A2 under the effect of the lifting cylinder 16.
  • the distance between the second axis or rotation A2 and the third joint J3, and thereby also the distance between the second axis or rotation A2 and the inner end of the outer boom cylinder 18 will vary when the piston rod 16b of the lifting cylinder 16 is extended in order to pivot the inner boom 15 upwards in relation to the column 13 and when the piston rod 16b of the lifting cylinder is retracted in order to pivot the inner boom 15 downwards in relation to the column 13.
  • the crane 10 is a foldable knuckle boom crane, wherein the inner and outer booms 15, 17 of the crane are foldable into a compact parking position when the crane is to be transported or stored, as illustrated in Figs 5 and 12 .
  • the telescopic crane boom sections 17b of the outer boom 17 are laterally offset in relation to the inner boom 15 and arranged to extend in parallel with and at the side of the inner boom 15, as illustrated in Fig 7 .
  • the telescopic crane boom sections 17b of the outer boom 17 are first retracted into the base section 17a of the outer boom in order to make the outer boom as short as possible, whereupon the outer boom 17 is folded downwards towards the inner boom 15 by retracting the piston rod 18b of the outer boom cylinder 18 as far as possible into the cylinder part 18a of the outer boom cylinder and thereby reducing the angle between the inner and outer booms 15, 17, as illustrated in Figs 9 and 14 .
  • the inner boom 15 is folded downwards together with the outer boom 17 towards the frame 11 from the intermediate position illustrated in Figs 9 and 14 to the final parking position illustrated in Figs 5 and 12 by retracting the piston rod 16b of the lifting cylinder 16 as far as possible into the cylinder part 16a of the lifting cylinder and thereby reducing the angle between the inner boom 15 and the column 13 as much as possible.
  • the inner and outer booms 15, 17 are moved in the opposite manner when they are to be moved from the parking position to the erected working position.
  • the inner boom 15 is first pivoted upwards in relation to the column 13 about the second axis of rotation A2 by extending the piston rod 16b of the lifting cylinder 16, whereupon the outer boom 17 is pivoted upwards in relation to the inner boom 15 about the third axis of rotation A3 by extending the piston rod 18b of the outer boom cylinder 18.
  • the third joint J3 is moved downwards and forwards in relation to the inner boom 15, whereby the distance between the second axis of rotation A2 and the third joint J3, and thereby the distance between the second axis of rotation A2 and the inner end of the outer boom cylinder 18, is increased, which in its turn implies that the outer boom 17 is automatically made to pivot somewhat upwards in relation to the inner boom 15 about the third axis of rotation A3.
  • This automatic pivoting movement of the outer boom 17 is achieved without any extension of the piston rod 18b of the outer boom cylinder 18, which consequently will increase the angular range that can be achieved between the inner and outer booms 15, 17 by means of an outer boom cylinder 18 having a given length of stroke.
  • the crane 10 according to the first embodiment of the invention illustrated in Figs 5-11 has exactly the same design as the prior art crane illustrated in Figs 1-4 .
  • the outer boom cylinder 18 has the same length of stroke as the outer boom cylinder 5 included in the prior art crane shown in Figs 1-4
  • the inner end of the outer boom cylinder 18 has the same position in relation to the column 13 and the inner boom 15 in the parking position of the crane as the inner end of the outer boom cylinder 5 included in the prior art crane shown in Figs 1-4
  • the joint 21 between the outer end of the outer boom cylinder 18 and the outer boom 17 has the same position on the outer boom as the corresponding joint of the prior art crane shown in Figs 1-4 .
  • FIG 2 illustrates the prior art crane with the outer boom cylinder 5 fully extended
  • Fig 6 illustrates the crane 10 according to the first embodiment of the invention with the outer boom cylinder 18 fully extended.
  • the outer boom 3 of the prior art crane is essentially in line with the inner boom 1
  • the outer boom 17 of the crane 10 according to the first embodiment of the invention is inclined slightly upwards in relation to the inner boom 15.
  • Figs 3 and 8 illustrate the prior art crane and the crane 10 according to the first embodiment of the invention in one and the same working position, i.e. with the inner boom 15 of the crane 10 in the same inclination in relation to the column 13 as the inner boom 1 of the prior art crane and with the outer boom 17 or the crane 10 in the same inclination in relation to the inner boom 15 as the outer boom 3 of the prior art crane.
  • the moment arm of the force acting on the third axis of rotation A3 i.e.
  • the position of the joint 21 between the outer end of the outer boom cylinder 18 and the outer boom 17 has been slightly altered as compared to the prior art crane illustrated in Figs 1-4 and as compared to the crane 10 according to the first embodiment illustrated in Figs 5-11 .
  • the crane 10 according to the second embodiment of the invention illustrated in Figs 12-14 has exactly the same design as the prior art crane illustrated in Figs 1-4 .
  • the outer boom cylinder 18 has the same length of stroke as the outer boom cylinder 5 included in the prior art crane shown in Figs 1-4 , and the inner end of the outer boom cylinder 18 has the same position in relation to the column 13 and the inner boom 15 in the parking position of the crane 10 as the inner end of the outer boom cylinder 5 included in the prior art crane shown in Figs 1-4 .
  • This reduced space requirement for the outer boom 17 in the parking position makes it possible to increase the length of the outer boom 17 without exceeding the maximum allowed width of the crane 10 in the parking position, which in its turn implies that the length of the outer boom 17 in its fully extended state, and thereby the range of the crane, can be increased by increasing the length of the base section 17a and the telescopic crane boom sections 17b and/or by increasing the number of telescopic crane boom sections 17b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Claims (9)

  1. Hydraulikkran, umfassend:
    - eine Kranbasis (12);
    - eine Säule (13), die drehbar an der Kranbasis (12) montiert ist, so dass sie in Bezug auf die Kranbasis um eine im Wesentlichen vertikale erste Drehachse (A1) drehbar ist;
    - einen anhebbaren und absenkbaren ersten Kranausleger (15), der gelenkig mit der Säule (13) verbunden ist, so dass er in Bezug auf die Säule um eine im Wesentlichen horizontale zweite Drehachse (A2) schwenkbar ist;
    - einen ersten Hydraulikzylinder (16) zum Anheben und Absenken des ersten Kranauslegers (15) in Bezug auf die Säule (13), wobei der erste Hydraulikzylinder (16) ein unteres Ende sowie ein gegenüberliegendes oberes Ende aufweist, wobei der erste Hydraulikzylinder (16) an seinem unteren Ende gelenkig mit der Säule (13) verbunden ist;
    - einen anhebbaren und absenkbaren zweiten Kranausleger (17), der gelenkig mit dem ersten Kranausleger (15) verbunden ist, so dass er in Bezug auf den ersten Kranausleger um eine im Wesentlichen horizontale dritte Drehachse (A3) schwenkbar ist;
    - einen zweiten Hydraulikzylinder (18) zum Anheben und Absenken des zweiten Kranauslegers (17) in Bezug auf den ersten Kranausleger (15), wobei der zweite Hydraulikzylinder (18) ein zu der Säule (13) weisendes Innenende und ein gegenüberliegendes, zu dem zweiten Kranausleger (17) weisendes Außenende aufweist;
    - ein erste Verbindungsglied (24), durch das das obere Ende des ersten Hydraulikzylinders (16) mit dem ersten Kranausleger (15) verbunden ist, wobei das erste Verbindungsglied (24) gelenkig mit dem oberen Ende des ersten Hydraulikzylinders (16) durch ein erstes Gelenk (J1) gelenkig verbunden ist und mit dem ersten Kranausleger (15) durch ein zweites Gelenk (J2) gelenkig verbunden ist; und
    - ein zweite Verbindungsglied (25), das eine Verbindung zwischen dem oberen Ende des ersten Hydraulikzylinders (16) und der Säule (13) oder zwischen dem ersten Verbindungsglied (24) und der Säule (13) bildet,
    dadurch gekennzeichnet, dass das Innenende des zweiten Hydraulikzylinders (18) mit dem ersten Kranausleger (15) durch das erste Verbindungsglied (24) verbunden ist, wobei das erste Verbindungsglied (24) gelenkig mit dem Innenende des zweiten Hydraulikzylinders (18) durch ein drittes Gelenk (J3) verbunden ist, und wobei das erste Verbindungsglied (24) derart konfiguriert ist, das dritte Gelenk (J3) in einem bogenförmigen Pfad (26) um das zweite Gelenk (J2) mechanisch zu führen, wenn der erste Kranausleger (15) in Bezug auf die Säule (13) um die zweite Drehachse (A2) unter der Wirkung des ersten Hydraulikzylinders (16) geschwenkt wird.
  2. Hydraulikkran nach Anspruch 1,
    dadurch gekennzeichnet, dass
    das zweite Verbindungsglied (25) an einem ersten Ende gelenkig mit dem oberen Ende des ersten Hydraulikzylinders (16) durch das erste Gelenk (J1) verbunden ist und an einem gegenüberliegenden zweiten Ende gelenkig mit der Säule (13) durch ein anderes Gelenk (J5) verbunden ist.
  3. Hydraulikkran nach Anspruch 1,
    dadurch gekennzeichnet, dass
    das zweite Verbindungsglied (25) an einem ersten Ende gelenkig mit dem ersten Verbindungsglied (24) durch ein viertes Gelenk (J4) verbunden ist, das zwischen dem ersten und dem zweiten Gelenk (J1, J2) angeordnet ist, und an einem gegenüberliegenden zweiten Ende gelenkig mit der Säule (13) durch ein anderes Gelenk (J5) verbunden ist.
  4. Hydraulikkran nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass
    der Hydraulikkran (10) ein klappbarer Knickarmkran ist, der zwischen einer kompakten Parkposition und einer ausgestreckten Arbeitsposition bewegbar ist, wobei der erste Kranausleger (15) zum Schwenken aufwärts in Bezug auf die Säule (13) um die zweite Drehachse (A2) konfiguriert ist, während der zweite Kranausleger (17) zum Schwenken aufwärts in Bezug auf den ersten Kranausleger (15) um die dritte Drehachse (A3) konfiguriert ist, wenn der Hydraulikkran (10) von der Parkposition in die Arbeitsposition bewegt wird.
  5. Hydraulikkran nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass
    das zweite Verbindungsglied (25) zwei Verbindungsgliedelemente aufweist, die parallel zueinander auf gegenüberliegenden Seiten der Säule (13) angeordnet sind.
  6. Hydraulikkran nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass
    der zweite Hydraulikzylinder (18) an seinem äußeren Ende gelenkig mit dem zweiten Kranausleger (17) durch ein Gelenk (21) verbunden ist.
  7. Hydraulikkran nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass
    der zweite Hydraulikzylinder (18) an seinem äußeren Ende gelenkig mit dem zweiten Kranausleger (17) durch ein Verbindungsgliedsystem (22) verbunden ist.
  8. Hydraulikkran nach einem der Ansprüche 1 bis 7,
    dadurch gekennzeichnet, dass
    der zweite Kranausleger (17) teleskopisch ausfahrbar ist, um so eine Einstellung seiner Erstreckungslänge zu ermöglichen.
  9. Hydraulikkran nach einem der Ansprüche 1 bis 8,
    dadurch gekennzeichnet, dass
    der Hydraulikkran (10) ein Lastkran oder ein Forstkran ist.
EP16204799.7A 2016-12-16 2016-12-16 Hydraulikkran Active EP3336043B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP16204799.7A EP3336043B1 (de) 2016-12-16 2016-12-16 Hydraulikkran
DK16204799.7T DK3336043T3 (da) 2016-12-16 2016-12-16 Hydraulisk kran
CN201780077798.1A CN110049940B (zh) 2016-12-16 2017-11-29 液压起重机
PCT/EP2017/080739 WO2018108523A1 (en) 2016-12-16 2017-11-29 Hydraulic crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16204799.7A EP3336043B1 (de) 2016-12-16 2016-12-16 Hydraulikkran

Publications (2)

Publication Number Publication Date
EP3336043A1 EP3336043A1 (de) 2018-06-20
EP3336043B1 true EP3336043B1 (de) 2019-11-13

Family

ID=57570511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16204799.7A Active EP3336043B1 (de) 2016-12-16 2016-12-16 Hydraulikkran

Country Status (4)

Country Link
EP (1) EP3336043B1 (de)
CN (1) CN110049940B (de)
DK (1) DK3336043T3 (de)
WO (1) WO2018108523A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2505521C2 (de) * 1974-02-21 1985-04-11 Osakeyhtiö Fiskars AB, Helsinki Gelenkauslegerkran
IT1225186B (it) * 1988-09-07 1990-11-02 Guidetti Luigi A Gru di sollevamento di tipo perfezionato per il montaggio su veicoli
SE466912B (sv) * 1990-08-29 1992-04-27 Hiab Ab Kran
ATE340146T1 (de) 2004-03-23 2006-10-15 Hiab Ab Schlauchführung eines krans
FI20055089A (fi) * 2005-02-23 2006-08-24 Ponsse Oyj Liikeratanosturi
BR112014032292A2 (pt) * 2012-07-16 2017-06-27 Itrec Bv guindaste marinho com grua articulada

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
CN110049940A (zh) 2019-07-23
DK3336043T3 (da) 2020-01-20
WO2018108523A1 (en) 2018-06-21
CN110049940B (zh) 2020-09-11
EP3336043A1 (de) 2018-06-20

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