EP0273955B1 - Verin hydraulique telescopique a deux etages - Google Patents

Verin hydraulique telescopique a deux etages Download PDF

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Publication number
EP0273955B1
EP0273955B1 EP87904488A EP87904488A EP0273955B1 EP 0273955 B1 EP0273955 B1 EP 0273955B1 EP 87904488 A EP87904488 A EP 87904488A EP 87904488 A EP87904488 A EP 87904488A EP 0273955 B1 EP0273955 B1 EP 0273955B1
Authority
EP
European Patent Office
Prior art keywords
stage
annular space
pressure medium
telescopic
interior
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.)
Expired
Application number
EP87904488A
Other languages
German (de)
English (en)
Other versions
EP0273955A1 (fr
Inventor
Günter Bartmann
Gerd BRÄCKELMANN
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.)
MONTAN-HYDRAULIK GmbH
Original Assignee
MONTAN-HYDRAULIK GmbH
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 MONTAN-HYDRAULIK GmbH filed Critical MONTAN-HYDRAULIK GmbH
Publication of EP0273955A1 publication Critical patent/EP0273955A1/fr
Application granted granted Critical
Publication of EP0273955B1 publication Critical patent/EP0273955B1/fr
Expired 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
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • 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
    • F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder

Definitions

  • the invention relates to a two-stage hydraulic telescopic cylinder with two pistons and annular spaces that can be pushed into one another between the individual telescopic members, a first pressure medium line connected to the pressure space of the cylinder and a second pressure medium line connected to the annular space of the first stage above the bottom of the first stage, a permanently open connection between the cylinder pressure chamber and the pressure chamber in the first stage and a constantly open connection between the annular space of the first stage and the interior of the second stage.
  • a correspondingly designed three-stage telescopic cylinder is known from DE-B-1107 383.
  • Mainly two-stage hydraulic telescopic cylinders are operated in positive sequence control in such a way that first the first stage extends and then the second and first the second stage and then the first.
  • valve control With a correspondingly designed valve control, it is then already possible in such cylinders to choose a different extension or retraction sequence, but the known two-stage hydraulic telescopic cylinders of this type do not permit synchronization both when extending and when retracting.
  • the synchronization of the cylinder stages both when extending and when retracting is also desirable from case to case. Synchronization can be achieved in conventional two-stage hydraulic cylinders using a surface-dependent displacement system, but the annular space of the first stage must then be designed to be as large as the piston surface of the second stage.
  • Such a system is so large that it can not be used in the preferred application of such telescopic cylinders, namely as telescopic cylinders for mobile cranes, if only because of its dimensions.
  • the object of the invention is to ensure the synchronism of the steps in a two-stage hydraulic telescopic cylinder while observing dimensions which also allow it to be used in connection with mobile cranes and the like.
  • the task is accomplished with a two-stage hydraulic telescopic cylinder with two pistons that can be pushed into each other and annular spaces between the individual telescopic members, a first pressure medium line connected to the pressure chamber of the cylinder and a second pressure medium line connected to the ring space of the first stage above the floor of the first stage, a constantly open one Connection between the cylinder pressure chamber and the pressure chamber in the first stage and a permanently open connection between the annular space of the first stage and the interior of the second stage is released, in which, according to the invention, the interior of the second stage is delimited by a head plate of the first stage, which together with the second piston forms an annular space of the second stage consisting of interconnected partial areas, and the annular space via an outgoing from the bottom of the cylinder, through the bottom of the first stage and the bottom of the second stage to the top plate of the first Stage extending telescopic bushing is connected to a further pressure medium line, and the annular space of the first stage and the interior of the second stage are of the same
  • this formulation takes into account telescopic cylinders with stages of different lengths.
  • the new telescopic cylinder thus combines the advantages of a synchronous cylinder with the advantages of the telescopic cylinders, which are operated in positive sequence control, and is desirably small.
  • the telescopic cylinder is operated in synchronism in particular when rapid telescoping is desired.
  • a method of operation in which only the first stage of the telescopic cylinder extends and retracts is particularly useful when large loads are to be handled when the boom is in a steep position.
  • a method of operation in which only the second stage is extended and retracted is used when the largest possible load should nevertheless be able to be handled with an extremely inclined boom. Another application of the latter method of operation is the installation of an additional stage.
  • a synchronization of both stages of the telescopic cylinder in the sense of covering the same distances is desirable in the case of mobile cranes and the like with a long boom length, in particular for structural reasons.
  • the pressure space of the second stage and the annular space of the second stage are at least essentially the same area.
  • the annular space of the first stage and the interior of the second stage have the same area.
  • the section of the telescopic feedthrough to the annular space of the second stage is formed by a double tube extending between the bottom of the first stage and the top plate of the first stage, the outer flow zone of which connects the annular space of the first stage via a connecting line in the base of the first stage connects the interior of the second stage.
  • the two-stage telescopic cylinder shown consists of the base cylinder 11 with the pressure chamber 113, the first hollow piston 12 (first stage) leading therein, with the formation of an annular chamber 114 (annular chamber of the first stage), with the pressure chamber 123 and which forms the annular chamber therein second stage leading second hollow piston 13 (second stage) with the interior 133.
  • the piston 12 of the first stage is provided with a head plate 126 delimiting the interior 133 of the second stage.
  • the cylinder pressure chamber 113 pressure chamber of the first stage
  • the pressure chamber 123 of the second stage are connected via a passage 1211 in the floor 121 of the first stage.
  • the annular space 114 of the first stage is connected to the interior 133 of the second stage via a connecting line 1212 which extends in the floor 121 of the first stage and which extends into a between the floor 121 and the head plate 126 through the floor 131 of the second stage passes through a passage 1261 in the outlet plate 1231 which ends in the top plate 126.
  • a first pressure medium line 21 opens (1111) at the bottom (111) of the cylinder 11 into the cylinder pressure chamber 113.
  • a second pressure medium line 22 is also connected to the annular chamber 114 of the first stage above the bottom 121 of the first stage (1112).
  • a further pressure medium line 23 opens (1113) into a connecting line 1262 extending from the floor 111 of the cylinder 11 and extending through the floor 121 of the first stage and the floor 131 of the second stage to the head plate 126 of the first stage, the pressure medium line 23 to the Annulus 124, 124 'of the second stage is connected.
  • the section 1232 of the telescopic bushing 1131, 1232 for connecting the pressure medium line 23 to the annular space 124, 124 'of the second stage and the bushing 1231 for connecting the annular space 114 of the first stage with the interior 133 of the second stage to form a double pipe 1231, 1232 summarized.
  • the pressure medium line 22 is blocked.
  • pressure medium is fed via the pressure medium line 21 into the pressure chamber 113 of the cylinder 11, under the action of which the second stage, that is to say the piston 12, extends.
  • pressure medium With the onset of the stroke of the piston 12, pressure medium is displaced from the annular space 114 of the first stage into the interior 133 of the second stage. If the condition is met that the annular space 114 of the first stage and the interior 133 of the second stage are of equal volume, the pressure medium displaced from the annular space 14 of the first stage into the interior 133 of the second stage supports the simultaneous extension of the second stage, that is to say the synchronization the cylinder steps.
  • the cylinder stages extend at the same speed when there is an area between the annular space 114 of the first stage and the interior 133 of the second stage.
  • the pressure medium displaced when exiting the annular space 124, 124 ′ of the second stage flows through the pressure medium line 23 to the tank.
  • To retract the telescopic cylinder pressure medium is fed through the pressure medium line 23 into the annular space 124, 124 'of the second stage.
  • the second stage of the telescopic cylinder is drawn in under the action of the pressure medium fed into the annular space 124, 124 'of the second stage.
  • the pressure medium displaced from the inner space 133 of the second stage into the annular space 114 of the first stage simultaneously draws in the first stage.
  • the pressure medium displaced both from the pressure chamber 123 of the second stage and from the pressure chamber 113 of the first stage flows through the pressure medium line 21 to the tank.
  • the pressure medium line 23 is thrown off.
  • pressure medium is then again fed through the pressure medium line 21 into the pressure chamber 113 of the cylinder 11, under whose influence the first stage of the telescopic cylinder is extended, while the second stage or final stage remains in its position.
  • the pressure medium displaced from the annular space 14 flows through the pressure medium line 22 to the tank.
  • the pressure medium present even before the second stage when pressure medium is fed into the pressure chamber 113 of the first stage remains ineffective with respect to the second stage, since the pressure medium present in the annular space 124, 124 'of the second stage is enclosed.
  • pressure medium is fed via the pressure medium line 22 into the annular space 114 of the first stage, under the action of which the first stage is drawn in again, the pressure medium located in the pressure space 113 of the first stage flowing off to the tank.
  • the pressure medium fed into the annular space 114 remains ineffective with respect to the second stage due to the fact that the pressure medium located in the annular space 124, 124 'of the second stage is enclosed.
  • pressure medium is fed via the pressure medium line 23 and the following connection 1131, 1232, 1262 into the annular spaces 124, 124 'of the second stage with the pressure medium lines 21 and 22 open.
  • the pressure medium located in the pressure chamber 123 of the second stage flows through the pressure medium line 21 to the tank.
  • each of the pressure medium lines 21, 22 and 23 is in the simplest case each provided with a 3/3-way valve, the valves being set individually in accordance with the specifications which can be seen in FIG. 6.
  • FIG. 5 shows a linked control which enables the control strategies attributed to the new telescopic cylinder.
  • the pressure medium line 21 there is a controllable lowering brake valve with an integrated check valve.
  • this valve 31 ensures that the pressure medium in the pressure spaces 113 and 123 does not flow out unintentionally, on the other hand it ensures the throttled outflow of the pressure medium in the pressure spaces upon retraction.
  • the lowering brake valve 31 can be actuated via control lines which emanate both from the pressure medium line 22 and from the pressure medium line 23 and which are combined via a shuttle valve 32.
  • the pressure medium line 23 is assigned a pressure relief valve 33 with downstream check valves 331 and 332, which in the bushing 1131, 1231 builds up excess pressure to the pressure-less pressure medium line 21 and 22, respectively.
  • a pressure relief valve 34 assigned to the pressure medium line 22 ensures, when the telescopic cylinder is operating in synchronism, that the first stage also remains convertible into its end position when the end stage is leading into the end position. The excess pressure building up in the annular space 114 of the first stage is reduced via this pressure relief valve 34 into one of the pressure medium lines 21 and 23, against which the pressure relief valve 34 is secured by the check valves 341 and 342.
  • a further preload valve 36 takes into account the opposite exceptional situation which is still possible when the telescopic cylinder is operating in synchronism, in which the first stage leads prematurely to the end position, the second stage is thus not yet in the end position and is now moved solely by the pressure medium fed in at the bottom.
  • the pressure medium still required for the complete filling of the interior 133 of the output stage is replenished via the pressure medium line 22, which is thrown off per se, and which is fed to the pressure medium line 22 from the pressure medium line 21 via the preload valve 36.
  • the so-called control spool is designated by 37, which shows the various circuit diagrams highlighting the possible driving styles in the illustration.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

Dans le but de pouvoir faire fonctionner également en synchronisme un vérin télescopique à deux niveaux pouvant être utilisé en mode de commande à séquencement automatique, il est proposé de doter le premier niveau (12) du vérin télescopique d'une plaque supérieure (126), afin de court-circuiter l'espace annulaire (114) du premier niveau (12) avec l'espace intérieur (133) du second niveau (13) isolé par la plaque supérieure (126) du premier niveau, et de prévoir une troisième canalisation sous pression (23) reliée à l'espace annulaire (124/124') du second niveau, formé par les régions partielles (124/124') créées par la plaque supérieure (126) du premier niveau (12), ladite connexion étant effectuée par l'intermédiaire d'une traversée (1131, 1232) télescopique s'étendant entre la base (111) du vérin (11) et la plaque supérieure (126) du premier niveau (12); il convient naturellement de s'assurer que l'espace annulaire (114) du premier niveau (12) et l'espace intérieur (133) du second niveau (13) sont égaux en volume.

Claims (5)

1. Vérin télescopique hydraulique à deux étages, avec deux pistons (12, 13) mobiles l'un dans l'autre et des espaces annulaires (114; 124, 124') entre les organes télescopiques individuels, avec une première conduite de milieu sous pression (21 ) raccordée à l'espace sous pression (113) du vérin (11) et avec une deuxième conduite de milieu sous pression (22) raccordée à l'espace annulaire (114) du premier étage, au-dessus du fond (121 ) du premier étage, avec une liaison (1211 ) constamment ouverte entre l'espace de pression de vérin (113) et l'espace de pression (123) situé dans le premier étage, ainsi qu'une liaison (1212, 1231 ) constamment ouverte entre l'espace annulaire (114) du premier étage et l'espace annulaire (133) du deuxième étage, caractérisé en ce que l'espace annulaire (133) du deuxième étage, qui forme conjointement avec le deuxième piston (13) un espace annulaire (124, 124') du deuxième étage qui se compose de zones partielles (124 et 124') reliées ensemble, et l'espace annulaire (124, 124') étant raccordé à une autre conduite de milieu sous pression (23) par l'intermédiaire d'un passage (1131, 1232) télescopique sortant du fond (111 ) du vérin (11 ) et s'étendant à travers le fond (121) du premier étage et le fond (131) du deuxième étage, jusqu'à la plaque de tête (126) du premier étage, et en ce que l'espace annulaire (114) du premier étage et l'espace annulaire (133) du deuxième étage sont de volume identique.
2. Vérin télescopique selon la revendication 1, caractérisé en ce que l'espace sous pression (123) du deuxième étage et l'espace annulaire (124, 124') du deuxième étage sont de surface sensiblement identique.
3. Vérin télescopique selon la revendication 1 ou 2, caractérisé en ce que l'espace annulaire (114) du premier étage et l'espace annulaire (133) du deuxième étage sont de surface identique.
4. Vérin télescopique selon l'une des revendications 1 à 3, caractérisé en ce que le passage télescopique (1131,1132) menant à l'espace annulaire (124,124') du deuxième étage est relié à l'espace annulaire (124, 124') par l'intermédiaire d'une conduite de liaison (1262) située dans la plaque de tête (126) du premier étage.
5. Vérin télescopique selon l'unedes revendications 1 à 4, caractérisé en ce que la pièce partielle (1232) du passage télescopique (1131,1232) allant vers l'espace annulaire (124, 124') du deuxième étage est formée par un tube double (1231, 1232) s'étendant entre le fond (121) du premier étage et la plaque de tête (126) du premier étage, tube dont la zone d'écoulement extérieure (1231 ) relie l'espace annulaire (114) du premier étage à l'espace annulaire (133) du deuxième étage par l'intermédiaire d'une conduite de liaison (1212) située dans le fond (1221) du premier étage.
EP87904488A 1986-07-03 1987-07-02 Verin hydraulique telescopique a deux etages Expired EP0273955B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3622424 1986-07-03
DE19863622424 DE3622424A1 (de) 1986-07-03 1986-07-03 Zweistufiger teleskopzylinder

Publications (2)

Publication Number Publication Date
EP0273955A1 EP0273955A1 (fr) 1988-07-13
EP0273955B1 true EP0273955B1 (fr) 1989-09-27

Family

ID=6304349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87904488A Expired EP0273955B1 (fr) 1986-07-03 1987-07-02 Verin hydraulique telescopique a deux etages

Country Status (7)

Country Link
US (1) US4852464A (fr)
EP (1) EP0273955B1 (fr)
JP (1) JPH01500609A (fr)
KR (1) KR880701839A (fr)
DE (2) DE3622424A1 (fr)
SU (1) SU1705398A1 (fr)
WO (1) WO1988000296A1 (fr)

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US5011532A (en) 1988-03-18 1991-04-30 Fuisz Pharmaceutical Ltd. Dispersed systems and method of manufacture
DE4209649C2 (de) * 1992-03-25 1998-12-24 Schloemann Siemag Ag Mehrstufiger hydraulischer Druck-Zylinder
US6029559A (en) * 1998-04-06 2000-02-29 Grove U.S. L.L.C. Telescoping system with multiple single-stage telescopic cylinders
US20060104774A1 (en) * 2002-12-18 2006-05-18 Sessler Laverne M Jr Mobile receptacle for a catching debris
US7171807B2 (en) * 2004-02-09 2007-02-06 Norco Industries, Inc. Oil circuitry for two-stage telescoping transmission jack
US7337885B2 (en) * 2004-12-28 2008-03-04 Smc Corporation Of America Telescoping cylinder
GB0511908D0 (en) * 2005-06-11 2005-07-20 Stannah Lifts Ltd Improvements in or relating to drive systems
GB2428650B (en) * 2005-08-04 2011-01-12 Messier Dowty Ltd Landing gear
US8011873B2 (en) * 2005-08-31 2011-09-06 Kooima Roger D Double cylinder tilt recovery system
US7823803B2 (en) * 2007-08-21 2010-11-02 Agco Corporation Integrated breakaway cylinder and method for constructing a boom assembly
EP2638278B1 (fr) * 2010-11-09 2019-08-07 Wayne S. Travis Appareil utilisant les forces de flottabilité et son procédé d'utilisation
CN103032406A (zh) * 2012-12-30 2013-04-10 蚌埠液力机械有限公司 同步二级伸缩油缸
WO2017015406A1 (fr) * 2015-07-20 2017-01-26 Archer Ip, Llc Presse à balles
CN105351283A (zh) * 2015-10-21 2016-02-24 徐州重型机械有限公司 一种双作用多级同步伸缩式油缸
CN107265332B (zh) * 2017-07-14 2023-05-26 陕西延长石油矿业有限责任公司 一种双回路二次涨拉千斤顶及使用方法
US10995565B1 (en) * 2019-12-18 2021-05-04 Logan Industries International Corporation Tubular handling tool
WO2024124313A1 (fr) * 2022-12-16 2024-06-20 Pereira Darci De Souza Actionneur hydraulique linéaire télescopique à tige d'injection fixe, droite dans la base du piston contenant un liquide statique

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Also Published As

Publication number Publication date
DE3760633D1 (en) 1989-11-02
JPH01500609A (ja) 1989-03-01
WO1988000296A1 (fr) 1988-01-14
SU1705398A1 (ru) 1992-01-15
KR880701839A (ko) 1988-11-05
EP0273955A1 (fr) 1988-07-13
DE3622424A1 (de) 1988-01-14
US4852464A (en) 1989-08-01

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