EP1270494A1 - Vorrichtung zur Ausschiebung des Teleskopmastes eines hydraulischen Krans - Google Patents

Vorrichtung zur Ausschiebung des Teleskopmastes eines hydraulischen Krans Download PDF

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Publication number
EP1270494A1
EP1270494A1 EP02013063A EP02013063A EP1270494A1 EP 1270494 A1 EP1270494 A1 EP 1270494A1 EP 02013063 A EP02013063 A EP 02013063A EP 02013063 A EP02013063 A EP 02013063A EP 1270494 A1 EP1270494 A1 EP 1270494A1
Authority
EP
European Patent Office
Prior art keywords
jack
jacks
hydraulic
extension
withdrawal
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Withdrawn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
EP02013063A
Other languages
English (en)
French (fr)
Inventor
Roberto Signori
Achille Guidorossi
Rossano Ceresoli
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.)
FASSI GRU IDRAULICHE SpA
Original Assignee
FASSI GRU IDRAULICHE 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 FASSI GRU IDRAULICHE SpA filed Critical FASSI GRU IDRAULICHE SpA
Publication of EP1270494A1 publication Critical patent/EP1270494A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • 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
    • 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
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
    • F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods

Definitions

  • This invention is concerned with a device for sequentially extending and withdrawing telescopic booms of hydraulic cranes, particularly cranes mounted on motorized trucks, lorries and the like.
  • Telescopic booms of hydraulic cranes are provided with a plurality of slidable sections driven by respective double-action, hydraulic jacks.
  • such sections have sizes (and therefore capacity loads) decreasing from the hinged foot to the end of the boom supporting the lifting hook, in order to give the boom a uniform resistance to bending stresses caused by the hanging load. It is therefore necessary that the boom extension sequence be performed progressively from the larger to the smaller section, while the collapse sequence must be performed progressively from the smaller to the larger section, so that the smaller sections are not stressed by excessive bending torques, which could damage the sections and affect the crane safety.
  • the sliding movement of sections of the telescopic boom with respect to each other generates considerable frictional forces, which also decrease from the foot to the end of the boom. These decreasing frictional forces also make it necessary that the above extension and withdrawal sequences are followed, in order to prevent jamming of the boom.
  • Prior Italian patent No. 1.233.225 describes hydraulic how to obtain said extension and withdrawal sequences by means of circuits having a first branch, through which the fluid is supplied to the boom during its extension, and is drained from the boom during its collapse, with first single-acting valves associated with each section but the last, which valves intercept, only during the extension, the fluid flowing from a section to the adjacent one, until the first section is completely extended; and having a second branch, through which the fluid is supplied to the boom during extension, and is drained from the boom during its collapse, with second single-acting valves associated with each section but the first, which valves intercept, only during collapse, the fluid flowing from a section to the adjacent one, until the first section is completely withdrawn.
  • Both the first and second single-acting valves are arranged on respective offtakes of said first and second branches, and are provided with shutters biased to their closed condition by elastic means and by the fluid pressure, while they are driven to their open condition by the pistons of the jacks of each section, during or at the end of their extension and withdrawal strokes.
  • the valves are arranged outside the jacks, respectively on the head and the bottom of each jack, or on the cases of the cylinders near said head and bottom.
  • a main object of the present invention is therefore to overcome the above mentioned drawbacks of the known devices, and more particularly to provide a device for driving the sequential extension and collapse of the type specified above, comprising first and second circuit branches of a hydraulic circuit which have a simplified structure which is free from flexiple tubes.
  • Another object is to provide a device as above, which is free from circuit tubes running outside the boom sections.
  • a known hydraulic crane 1 comprises a base 2 for mounting the crane on a truck, a lorry or the like and an upright 3 supported on base 2 and carrying a first boom 5 hinged to it by means of a pin 4 and driven by a jack 6.
  • a second boom 7, provided with slidable sections, is hinged to boom 5 and is driven by a jack 8.
  • boom 7 consists of a plurality of telescopic sections 9, 10, 11, 12, which are slidable within one another and which are driven by respective hydraulic, double-action jacks 13a, 13b, 13c, 13d, each comprising respective rods such as 18 integral with pistons such as 20 and sliding within cylinders such as 23.
  • each jack 13 comprises hydraulic circuit branches 14, 15, supplying the fluid during the extension and withdrawal steps, respectively, which branches comprise transfer conduits 16 and 17, the former conduits 16 being associated with the extension of the boom and the latter conduits 17 being associated with the collapse of the boom, as will be explained below.
  • transfer conduits 16 and 17 are bored inside rods 18 of jacks 13. Transfer conduit 16 is intercepted by a transfer valve 19 arranged on the head of corresponding piston 20 of jack 13 and mechanically operated by operating tappets 21 engaged by the bottom 22 of cylinder 23 of the jack.
  • Supplying pressurized fluid through transfer conduit 17 will cause withdrawal of the pistons in the upstream jacks (with reference to the fluid flow) and initial collapse of the associated jack through an offtake 17a, also bored within rod 18 and controlled by a two-ways switch 24 that is carried on said rod 18 and is mechanically operated by a control finger 25 attached to the external end of rod 18 of adjacent jack 13 (Fig. 3).
  • One way of switch 24 includes a single-acting valve 28, the other consists of a free port 29.
  • first chamber 25 being delimited by piston 20 and cylinder 23, and a second chamber 27 by rod 18 and cylinder 23.
  • pressurized fluid is supplied to the first chamber 26 through branch 14.
  • transfer valve 19 is opened by the engagement of rods 21 with cylinder bottom 22, and pressurized fluid flows into the first chamber 26 of the downstream jack (with reference to the fluid flow), through transfer conduit 16, etc.
  • the desired extension sequence of the jacks from the first 13a to the last 13d is therefore performed.
  • the fluid is discharged from second chamber 27 through branches 15 and transfer conduits 17.
  • conduit 17 When, at the end of the stroke, branch 15 is intercepted by conduit 17, the fluid in chamber 27 is drained through offtake 17a, port 29 and conduit 17, which is aligned with branch 15.
  • downstream jack 13b accidentally extends before piston 20 of upstream jack 13a has completed its stroke (although, in this case, finger 25 switches switch 24 to cause valve 28, rather than port 29 to intercept branch 17a), the fluid can be drained through offtake 17a, single-acting valve 28 and conduit 17, thus preventing overpressures to build up in the chamber.
  • Fig. 4 it can be seen that the collapse sequence starts from last jack 13d, which, at the completion of its withdrawal stroke, switches switch 24 of downstream jack 13c by means of its finger 25. Therefore, offtake 17a is directly connected to transfer conduit 17, and pressurized fluid is supplied into chamber 27 of jack 13c, which starts its withdrawal stroke. After a certain portion of the stroke, pressurized fluid is no longer supplied to chamber 27 through conduit 17, valve 24 and offtake 17a, because, during the withdrawal of piston 20, the fluid flows directly into chamber 27 through branch 15. At the end of the withdrawal stroke, finger 25 of jack 13c switches switch 24 of downstream jack 13b, which will starts its withdrawal, etc.
  • the jack located downstream of the one which is withdrawing e.g. first jack 13a, does not move. In fact, until its switch 24 is switched by finger 25 of the upstream jack, the fluid cannot be supplied into chamber 27 because offtake 17a is intercepted by single-acting valve 28.
  • offtakes 17a of withdrawal transfer conduits 17 are dispensed with, and second hydraulic chambers 27' comprise a terminal web 30, which separates a terminal transfer portion 27t of the chamber.
  • switches 24 are replaced by taps 24' connecting branches 15 to chambers 27'. All taps 24' but the penultimate are operated by fingers 25' supported by jack cylinders 23'.
  • Single-acting valves 28' whose function will be specified below, are arranged in parallel to taps 24'.
  • the same sequence of the preferred embodiment is executed.
  • the withdrawal sequence starts from last jack 13d which, at the end of its withdrawal stroke, closes tap 24' of third jack 13c by means of its auxiliary finger 25" which is attached to rod 18' rather than to cylinder 23', so that the pressurized fluid will flow from branch 15 into chamber 27' of the third jack 13c, causing the latter to start its withdrawal stroke.
  • the first jack 13a and the second jack 13b cannot withdraw because their respective taps 24' are open, and the pressurized fluid cannot reach their hydraulic chambers 27' because it is directly supplied into chamber 27' of third jack 13c, through branches 15 and transfer conduits 17' of said first and second jacks.
  • downstream jack allows the tap of the upstream jack to open, so that, due to the absence of any valves, the fluid would not be drained from chamber 27' of the upstream jack and would cause an overpressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Jib Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP02013063A 2001-06-18 2002-06-13 Vorrichtung zur Ausschiebung des Teleskopmastes eines hydraulischen Krans Withdrawn EP1270494A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20010586 ITTO20010586A1 (it) 2001-06-18 2001-06-18 Dispositivo perfezionato di sfilamento e rientro sequenziali di sezioni di bracci telescopici di gru idrauliche.
ITTO20010586 2001-06-18

Publications (1)

Publication Number Publication Date
EP1270494A1 true EP1270494A1 (de) 2003-01-02

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IT (1) ITTO20010586A1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012119169A1 (de) * 2011-03-10 2012-09-13 Palfinger Ag Ladekran-ausleger
EP2101066A3 (de) * 2008-03-12 2013-02-20 Linde Material Handling GmbH Einrichtung zur Sicherung der Bewegungsreihenfolge von zumindest zwei fluidbetätigten Verdrängereinheiten
CN103899585A (zh) * 2014-03-03 2014-07-02 徐州徐工随车起重机有限公司 一种双油缸顺序伸缩的液压控制系统、吊臂机构及起重机
WO2015086532A1 (en) * 2013-12-12 2015-06-18 Fella Werke Gmbh Hydraulic system for automatic sequential cylinder operation
CN105370645A (zh) * 2015-12-14 2016-03-02 黑龙江省农业机械工程科学研究院 一种新型顺序动作液压缸
CN105605022A (zh) * 2016-03-14 2016-05-25 三一帕尔菲格特种车辆装备有限公司 一种多油缸顺序伸缩机构及工程机械
CN105864134A (zh) * 2016-04-22 2016-08-17 三帕尔菲格特种车辆装备有限公司 多油缸顺序伸缩系统及起重机
CN109973463A (zh) * 2019-04-22 2019-07-05 韶关市起重机厂有限责任公司 一种能可靠顺序伸缩的油缸、多油缸顺序伸缩机构及工程机械
RU205844U1 (ru) * 2021-04-28 2021-08-11 Открытое акционерное общество "Машиностроительный завод "АРСЕНАЛ" Гидравлически управляемая телескопическая стрела судового крана
RU2771616C1 (ru) * 2021-04-28 2022-05-12 Открытое акционерное общество "Машиностроительный завод "АРСЕНАЛ" Гидравлически управляемая телескопическая стрела судового крана

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1233225B (it) * 1989-07-21 1992-03-20 Fassi Gru Idrauliche S P A Dispositivo di sfilamento e rientro sequenziali controllati di sezio ni di bracci telescopici per gru idrauliche
US5518129A (en) * 1991-10-21 1996-05-21 Palfinger Aktiengesellschaft Boom including plural arms telescopically extendible and retractable successively
WO1996041764A1 (en) * 1995-06-08 1996-12-27 Hiab Ab Extendible boom, particularly for cranes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1233225B (it) * 1989-07-21 1992-03-20 Fassi Gru Idrauliche S P A Dispositivo di sfilamento e rientro sequenziali controllati di sezio ni di bracci telescopici per gru idrauliche
US5518129A (en) * 1991-10-21 1996-05-21 Palfinger Aktiengesellschaft Boom including plural arms telescopically extendible and retractable successively
WO1996041764A1 (en) * 1995-06-08 1996-12-27 Hiab Ab Extendible boom, particularly for cranes

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101066A3 (de) * 2008-03-12 2013-02-20 Linde Material Handling GmbH Einrichtung zur Sicherung der Bewegungsreihenfolge von zumindest zwei fluidbetätigten Verdrängereinheiten
RU2610898C2 (ru) * 2011-03-10 2017-02-17 Палфингер Аг Стрела погрузочного крана
AT12645U1 (de) * 2011-03-10 2012-09-15 Palfinger Ag Ladekran-ausleger
CN103429522A (zh) * 2011-03-10 2013-12-04 帕尔菲格股份有限公司 装卸起重机悬臂
CN103429522B (zh) * 2011-03-10 2015-10-21 帕尔菲格股份有限公司 装卸起重机悬臂
US9718655B2 (en) 2011-03-10 2017-08-01 Palfinger Ag Loading crane jib
AU2012225180B2 (en) * 2011-03-10 2017-05-18 Palfinger Ag Loading crane jib
WO2012119169A1 (de) * 2011-03-10 2012-09-13 Palfinger Ag Ladekran-ausleger
WO2015086532A1 (en) * 2013-12-12 2015-06-18 Fella Werke Gmbh Hydraulic system for automatic sequential cylinder operation
CN103899585A (zh) * 2014-03-03 2014-07-02 徐州徐工随车起重机有限公司 一种双油缸顺序伸缩的液压控制系统、吊臂机构及起重机
CN103899585B (zh) * 2014-03-03 2016-08-24 徐州徐工随车起重机有限公司 一种双油缸顺序伸缩的液压控制系统、吊臂机构及起重机
CN105370645B (zh) * 2015-12-14 2017-04-19 黑龙江省农业机械工程科学研究院 一种新型顺序动作液压缸
CN105370645A (zh) * 2015-12-14 2016-03-02 黑龙江省农业机械工程科学研究院 一种新型顺序动作液压缸
CN105605022A (zh) * 2016-03-14 2016-05-25 三一帕尔菲格特种车辆装备有限公司 一种多油缸顺序伸缩机构及工程机械
CN105605022B (zh) * 2016-03-14 2018-06-12 三一帕尔菲格特种车辆装备有限公司 一种多油缸顺序伸缩机构及工程机械
CN105864134A (zh) * 2016-04-22 2016-08-17 三帕尔菲格特种车辆装备有限公司 多油缸顺序伸缩系统及起重机
CN109973463A (zh) * 2019-04-22 2019-07-05 韶关市起重机厂有限责任公司 一种能可靠顺序伸缩的油缸、多油缸顺序伸缩机构及工程机械
RU205844U1 (ru) * 2021-04-28 2021-08-11 Открытое акционерное общество "Машиностроительный завод "АРСЕНАЛ" Гидравлически управляемая телескопическая стрела судового крана
RU2771616C1 (ru) * 2021-04-28 2022-05-12 Открытое акционерное общество "Машиностроительный завод "АРСЕНАЛ" Гидравлически управляемая телескопическая стрела судового крана

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Publication number Publication date
ITTO20010586A1 (it) 2002-12-18

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