EP0566720A1 - Fleche telescopique a plusieurs etages. - Google Patents

Fleche telescopique a plusieurs etages.

Info

Publication number
EP0566720A1
EP0566720A1 EP92923176A EP92923176A EP0566720A1 EP 0566720 A1 EP0566720 A1 EP 0566720A1 EP 92923176 A EP92923176 A EP 92923176A EP 92923176 A EP92923176 A EP 92923176A EP 0566720 A1 EP0566720 A1 EP 0566720A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
piston rod
line
hydraulic
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.)
Granted
Application number
EP92923176A
Other languages
German (de)
English (en)
Other versions
EP0566720B1 (fr
Inventor
Eckhard Wimmer
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.)
Palfinger AG
Original Assignee
Palfinger AG
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 Palfinger AG filed Critical Palfinger AG
Publication of EP0566720A1 publication Critical patent/EP0566720A1/fr
Application granted granted Critical
Publication of EP0566720B1 publication Critical patent/EP0566720B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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

Definitions

  • the invention relates to a multi-stage telescopic boom, in particular for a loading crane on a truck, with a piston and cylinder each having a hydraulic unit between successive, telescopically arranged arms, at least in the cylinder of the innermost arm a tube axially into the cylinder bottom There is a cylinder space which, when the piston is at least partially retracted, extends into the hollow piston rod in a sealed manner, and thus seals the cylinder space from the interior of the hollow piston rod.
  • Sequence controls for loading cranes have the purpose of ensuring that the individual arms of a telescopic boom are extended or retracted in a specific, usually rigidly defined sequence.
  • the loading cranes previously used by Palfinger Akti ⁇ engesellschaft are equipped with a mechanically simple sequence control of the type defined at the outset, which, however, has the disadvantage that only that arm of the telescopic boom which is supported directly on the articulated arm surrounding it is forcibly extended first .
  • the other arms of the telescopic boom (thrust arm), however, are not fixed in terms of the order in which they are extended.
  • the valve which is actuated by the stop arranged on the articulated arm, is located on the piston-side end of the hydraulic cylinder directed towards the articulated arm, which actuates the first arm. Only when this first arm is fully extended does the valve designed as a check valve release the flow of the hydraulic fluid to the cylinders of the further telescopic arms.
  • DE-A 34 13 443 already shows a three-stage telescopic boom with a control device for fixing any exit order.
  • the hydraulic oil is fed into the central cylinder via a telescopic sliding line attached to the basic cylinder, which is technically complex and takes up some space on the side next to the piston rod of the basic cylinder.
  • the hydraulic oil is fed into the outermost cylinder via a tube which protrudes axially from the cylinder base and which, sealed against the piston, extends into a hollow piston rod which is connected to the control device.
  • the oil flowing out of the said tube of the basic cylinder passes through a line into a further tube projecting from the bottom of the central cylinder, which leads sealed to the piston in this cylinder and into the hollow piston rod thereof.
  • DE-A 34 13 443 The end of this hollow piston rod communicates with the cylinder space of the outermost hydraulic unit.
  • the extension sequence is controlled exclusively via the external control device, which can control any extension sequence. This does not ensure that the telescopic arms are automatically extended starting from the innermost one.
  • DE-A 34 13 443 does not teach how more than three hydraulic units are possible with a more than three-stage telescopic boom.
  • the object of the invention is to design a structurally simple and compact device of the type outlined at the outset in such a way that it becomes suitable for the automatic sequential control of a plurality of telescopic arms.
  • each hollow piston rod is connected to the cylinder space of the next outer hydraulic unit via a preferably rigid line and that the interior of each hollow piston rod communicates with the cylinder space of the same hydraulic unit when the piston is fully extended. While the pipe protruding from DE-A 34 13 443 from the cylinder bottom and reaching into the hollow piston rod serves only for hydraulic oil passage to the next (third) hydraulic unit and therefore always with the interior of the hollow at each piston position
  • the piston of the cylinder chamber of the hydraulic unit is sealed against the interior of the hollow piston rod connected to the cylinder chamber of the next hydraulic unit, the interior of the hollow piston rod communicates with the cylinder chamber of the same hydraulic unit when the piston is fully extended. This can ensure that when hydraulic fluid is fed into the cylinder space of a hydraulic unit, the piston first extends without hydraulic oil flowing further into the next outer hydraulic unit. Only when the piston is fully extended does communication occur between the cylinder space and the interior of the hollow piston rod, and the hydraulic oil can flow further into the next outer hydraulic unit.
  • a preferred embodiment provides that the tube even when the piston is fully extended is guided in the piston and near its free end has at least one opening in the tube jacket which, when the piston is fully extended, lies in the cylinder space and thus establishes communication between the cylinder space and the hollow piston rod through the end region of the tube.
  • the closed tube wall seals the interior of the hollow piston rod from the cylinder space.
  • the line leading from the interior of the hollow piston rod into the cylinder space of the next outer hydraulic unit can advantageously be designed as a low-wear and pressure-resistant rigid line »
  • Can •• drain valves may be controlled by the break-in condition of the ssen ⁇ outer hydraulic unit.
  • the ange horr ⁇ ⁇ th valves preferably also in reverse apparent check valves in the line to be that of the next inner of the hollow piston rod The hydraulic oil supply through such a check valve for extending the piston is always possible. If the piston is actuated in the retracting direction, this check valve initially blocks, but receives a signal via a control line.
  • the check valve also opens in its original blocking direction and the hydraulic oil can flow out of the cylinder space via the line into the hollow piston rod of the next inner cylinder, from where the hydraulic oil flows through the pipe and from this into a drain line, which in turn can open into a line which leads to the interior of the hollow piston rod of the next inner hydraulic unit, from where the hydraulic oil in turn can flow out via the pipe.
  • the pipes according to the invention thus serve not only for the automatic control of the extension follow-up frequency, but also for the return of hydraulic oil when the hydraulic units are retracted.
  • FIG. 1 shows a schematic representation of a loading crane with a four-stage telescopic boom
  • FIG. 2 shows a circuit diagram of a sequence control according to the invention with hydraulic control of the inputs.
  • FIG. 3 a circuit diagram of a sequence control according to the invention with an electrical control of the running-in sequence
  • FIG. 4 an axial section through a hydraulic unit in the area of the cylinder base with the piston retracted
  • FIG. 5 an axial one
  • a lifting arm 5 is mounted on this stand 3 by means of a lifting cylinder 1 so that it can pivot about a horizontal axis 4.
  • a so-called articulated arm 7 can be pivoted about a further horizontal axis 9 by means of the hydraulic unit 6 and the toggle lever 2.
  • the articulated arm 7 forms a four-stage telescopic boom with a series of arms 11 - 14 arranged telescopically therein, all of which are referred to as thrust arms.
  • the invention relates to a sequence control for extending and retracting the arms 11, 12, 13, 14, which are connected to the articulated arm 7 or to one another by a series of four hydraulic units 15a-d (some of which are not visible).
  • FIG. 2 shows a circuit diagram of the hydraulic units 15a-d for a multi-stage telescopic boom according to the invention.
  • Each hydraulic unit has a piston 18a-d with piston rod 17a-d, which is displaceably mounted in a cylinder 16a-d.
  • cylinder 16a could be connected to articulated arm 7 of FIG. 1, while piston rod 17a connected to arm 11, piston rod 17b connected to arm 12, piston rod 17c connected to arm 13, and piston rod 17d connected to arm 14 can stand.
  • the cylinders 16b-d of the three outer hydraulic units 15b-d are each rigidly connected to the piston rods 17a-c of the next inner hydraulic units 15a-c fertilizer, so that the lines 19a-c, 20a-c to be explained in more detail can advantageously be designed as rigid lines.
  • the exit line 21 and the entry line 22 can also be designed as rigid lines.
  • the tube 23a-c is now designed according to the invention in such a way that, when the piston is fully extended (piston 18a of the innermost hydraulic unit 15a), communication of the respective cylinder space with the interior of the piston rod of the same hydraulic unit is possible, as is the case with the innermost hydraulic unit 15a of FIG. 2 is shown.
  • the tube 23 a is shorter than the displacement path of the piston 18 a.
  • this interior 25a is now connected to the cylinder space 24b of the next outer hydraulic unit 15d via a preferably rigid line 19.
  • the extension line 21 is pressurized with hydraulic oil under pressure, only the piston 18a together with the piston rod 17a and thus the innermost arm of the boom are extended. Only when the piston 18a reaches the end position shown in FIG. 2 does hydraulic oil flow into the next outer hydraulic unit 15b and there displaces the piston 18b together with the piston rod 17b to the outside. 2 is the piston 18b has already been partially extended while the two outer hydraulic units 15c and d are still fully retracted.
  • Retractable hydraulic lines 22, 20a-c which communicate with one another, are provided for the retracting movement of the piston rod 17a-d. These lines each open into the annular space defined between the piston rod 17a-d and the cylinder wall, specifically on the side of the extended piston 18a-d facing away from the piston head. From this annular space, a line 26a-c is then provided in the region of the piston through the piston rod 17a-c and separated from the interior 25a-c of the piston rod, which leads into a retractable hydraulic line 20a-c to the next outer one Hydraulic unit opens. In this way, when the hydraulic inlet line 22 is pressurized with hydraulic oil under pressure, all pistons 18a-d are initially acted on in the direction of insertion.
  • the piston 18a can then only move in a minimal distance until the tube 23a seals the cylinder space 24a.
  • the check valve 27a initially blocks further retraction of the piston 18a.
  • the pistons 18b and 18c can initially only move in minimally until the tube 23b or 23c seals the cylinder space 24b or 24c. Because of the initially closed check valves 27b and 27c, the hydraulic oil can nowhere flow out of the cylinder spaces 24b and 24c and the pistons 18b and 18c cannot initially retract further. Only the outermost piston 18d can retract freely from the start, since there is nothing to prevent hydraulic oil from flowing out of the cylinder space 24d.
  • This outflow of hydraulic oil takes place first via line 19c, the piston rod interior 25c and the pipe 23c, to which an outflow line 28c is connected.
  • a second check valve 29c is arranged in this drain line and the drain line 28c opens into the line 19b on the side of the first check valve 27c facing away from the cylinder space.
  • the second check valve 29c prevents hydraulic oil from penetrating into the tube 23c when the piston 18c is extended, but allows hydraulic oil to flow freely out of this tube 23c. From line 19b, the outflow through hydraulic units 15b and 15a takes place in an analogous manner.
  • the piston 18d opens, via an actuating pin 31d, the initially blocked check valve 32d, which is arranged in the control line 30c and which essentially represents a device for detecting the fully retracted position of the piston 18d.
  • Hydraulic oil now flows via the control line 30c to the next inner hydraulic unit 15c and there opens the check valve 27c.
  • the hydraulic oil located in the cylinder space 24c can thus flow off in the previously described way and the piston 18c together with the piston rod 17c can retract.
  • the fully retracted piston 18d then presses on the check valve 32c via the actuating pin 31c, with which hydraulic oil flows via the control line 30b to the hydraulic unit 15b.
  • the same control processes take place there as with the hydraulic unit 15c.
  • hydraulic oil gets into the line 30a and opens the first check valve 27a, with which the innermost piston rod 17a can also retract.
  • the device for detecting the fully retracted position of a piston can also detect the position of the arm of the telescopic boom moved by the corresponding piston rod.
  • a control pulse can also be derived from the position of the telescopic arm as soon as it is fully retracted.
  • the embodiment shown in FIG. 3 differs from the embodiment shown in FIG. 2 essentially in that the first check valves 27'ac are electrically actuated to control the order of entry. Otherwise, the hydraulic units are constructed essentially the same as in the embodiment shown in FIG. 2.
  • the tubes 23a-c are shown in FIG. 3 only with a line, in reality, of course, just as hollow as the tubes shown in FIGS. 2, 4 and 5.
  • the hydraulic line 22 is pressurized.
  • the piston of the outermost hydraulic unit 15d is thus first retracted.
  • a stop 31d on the piston rod or on the corresponding arm of the boom closes the switching element 32'd when the piston is fully retracted, which means that current supplied from the current source 33 via the electrical line 34 into the non-return valve 27- c leading line 30'c can flow.
  • the valve 27 * c opens and thus releases the outflow of hydraulic oil from the cylinder space of the hydraulic unit 15c, whereupon the latter moves in.
  • the stop 31'c and the switching element 32'c switch the electromagnetically actuated check valve 27 * b via the line 30-b and the stop 31'b with the switching element 32-b switch the electromagnetically actuated via the electrical control line 30-a Check valve 27'a. Overall, the run-in sequence is automatically determined.
  • non-contact switching holding elements can also be provided, for example magnetically actuated reed switches or switching elements switched via a light barrier or the like.
  • 4 shows a longitudinal section through a hydraulic unit 15b in the region of the cylinder base 34b with the piston 18b fully retracted.
  • the tube 23b screwed in by means of a hollow screw 35 stands in the axial direction from the cylinder base 34b into the cylinder space.
  • the check valve 27b allows an unimpeded outflow of hydraulic oil from the pipe 23b into the line to be connected at the point 36.
  • Hydraulic oil for extending the piston 18b is supplied via the opening 37 and the line section 38 shown in dashed lines, which via a check valve not shown in more detail at point 39 (corresponding to the first check valve 27b of FIGS. 2 and 27'b of FIG Fig. 3) hydraulic oil can be supplied. Since the tube 23b is sealed off from the piston 18b by means of a seal 40, the piston moves out through the opening 37 when hydraulic oil is supplied, without hydraulic oil first entering the interior 25b of the hollow piston rod 17b.
  • the piston rod 17b is designed as a double tube, the inner tube 48 lying concentrically to the outer tube 47 flowing around the interior 25b of the piston rod 17b.
  • the annular space 49 lying between the outer 47 and the inner 48 tube provides a line (corresponding to the line 26b in FIG. 2) which is hydraulically separated from the interior 25b in the piston rod in order to transfer hydraulic oil from the cylinder interior 50 to lead the opening 51 through the piston rod annular space 49 out of the piston rod and from there into the cylinder annular space of the next outer hydraulic unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jib Cranes (AREA)
  • Actuator (AREA)

Abstract

Flèche télescopique à plusieurs étages, en particulier pour une grue de chargement sur un camion, dans laquelle un système hydraulique comportant un piston et un cylindre est disposé chaque fois entre des bras (11-14) télescopiques successifs placés l'un dans l'autre. Un tube (23a-c) est dressé dans le sens axial dans le volume du cylindre depuis le fond du cylindre, tube qui pénètre, lorsque le piston est rentré, dans la tige creuse (17a-c) du piston en formant un assemblage étanche par rapport à ce piston et en assurant ainsi une étanchéité du volume du cylindre par rapport au volume intérieur de la tige creuse du piston. Pour obtenir une séquence automatique d'opérations de sortie des bras télescopiques, il est prévu que le volume intérieur (25a-c) de chaque tige creuse (17a-c) des pistons soit relié par une conduite (19a-c) de préférence rigide au volume du cylindre (24b-d) du système hydraulique (15b-d) qui fait suite en direction de l'extérieur et que le volume intérieur (25a-c) de chaque tige creuse (17a-c) des pistons communique avec le volume du cylindre (24a-c) du même système hydraulique (15a-c) lorsque le piston (18a-c) est entièrement sorti.
EP92923176A 1991-11-11 1992-11-10 Fleche telescopique a plusieurs etages Expired - Lifetime EP0566720B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT2224/91 1991-11-11
AT0222491A AT398304B (de) 1991-11-11 1991-11-11 Mehrstufiger teleskopausleger
PCT/AT1992/000144 WO1993010034A1 (fr) 1991-11-11 1992-11-10 Fleche telescopique a plusieurs etages

Publications (2)

Publication Number Publication Date
EP0566720A1 true EP0566720A1 (fr) 1993-10-27
EP0566720B1 EP0566720B1 (fr) 1996-01-17

Family

ID=3530338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92923176A Expired - Lifetime EP0566720B1 (fr) 1991-11-11 1992-11-10 Fleche telescopique a plusieurs etages

Country Status (6)

Country Link
EP (1) EP0566720B1 (fr)
JP (1) JPH06504514A (fr)
AT (2) AT398304B (fr)
DE (1) DE59205113D1 (fr)
ES (1) ES2085045T3 (fr)
WO (1) WO1993010034A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9718655B2 (en) 2011-03-10 2017-08-01 Palfinger Ag Loading crane jib

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504463C2 (sv) * 1995-06-08 1997-02-17 Hiab Ab Förlängningsbar arm, särskilt för kranar
EP0749935A1 (fr) * 1995-06-23 1996-12-27 ATLAS WEYHAUSEN GmbH Procédé pour commander une flêche télescopique à sections multiples ainsi que le système de commande pour la mise en oeuvre du procédé
ES2194560B1 (es) 2000-07-11 2005-03-01 Partek Cargotec, S.A. Cilindro hidraulico para brazos telescopicos.
GB0030081D0 (en) * 2000-12-09 2001-01-24 Sheppee Internat Ltd Fluid actuated piston
DE202005012049U1 (de) * 2005-08-01 2006-12-14 Liebherr-Werk Ehingen Gmbh Teleskopierbarer Schiebeholm
DE102011100632A1 (de) 2011-04-04 2012-10-04 Ak Regeltechnik Gmbh Kolben-Zylinder-Einheit
CN103896155B (zh) * 2014-01-27 2016-03-16 徐州徐工随车起重机有限公司 控制双缸顺序伸缩的液控系统、吊臂机构及起重机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU410319B1 (en) * 1967-03-23 1971-02-05 Alexander Popov Constantine Telescopically extensible hydraulic boom
IT1139785B (it) * 1981-11-18 1986-09-24 Giorgio Bormioli Dispositivo per l'azionamento sequinziale di organi comandati
DE3413443A1 (de) * 1984-04-10 1985-10-17 Walter Hunger KG Hydraulikzylinderwerk, 8770 Lohr Dreistufiger teleskopausleger
DE3806390A1 (de) * 1988-02-29 1989-09-07 Walter Hunger Teleskopierzylindersystem
ATA309488A (de) * 1988-12-20 1990-09-15 Palfinger Ag Ladekran

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9310034A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9718655B2 (en) 2011-03-10 2017-08-01 Palfinger Ag Loading crane jib

Also Published As

Publication number Publication date
AT398304B (de) 1994-11-25
ATE133142T1 (de) 1996-02-15
ES2085045T3 (es) 1996-05-16
WO1993010034A1 (fr) 1993-05-27
DE59205113D1 (de) 1996-02-29
JPH06504514A (ja) 1994-05-26
ATA222491A (de) 1994-03-15
EP0566720B1 (fr) 1996-01-17

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