EP2159428B1 - Unité de cylindre-piston - Google Patents

Unité de cylindre-piston Download PDF

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Publication number
EP2159428B1
EP2159428B1 EP09010310.2A EP09010310A EP2159428B1 EP 2159428 B1 EP2159428 B1 EP 2159428B1 EP 09010310 A EP09010310 A EP 09010310A EP 2159428 B1 EP2159428 B1 EP 2159428B1
Authority
EP
European Patent Office
Prior art keywords
piston
rod
cylinder
cylinder unit
unit according
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.)
Not-in-force
Application number
EP09010310.2A
Other languages
German (de)
English (en)
Other versions
EP2159428A3 (fr
EP2159428A2 (fr
Inventor
Erwin Morath
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.)
Liebherr Werk Ehingen GmbH
Original Assignee
Liebherr Werk Ehingen 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 Liebherr Werk Ehingen GmbH filed Critical Liebherr Werk Ehingen GmbH
Publication of EP2159428A2 publication Critical patent/EP2159428A2/fr
Publication of EP2159428A3 publication Critical patent/EP2159428A3/fr
Application granted granted Critical
Publication of EP2159428B1 publication Critical patent/EP2159428B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
    • 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
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • B66C23/78—Supports, e.g. outriggers, for mobile cranes
    • B66C23/80—Supports, e.g. outriggers, for mobile cranes hydraulically actuated

Definitions

  • the invention relates to a piston-cylinder unit, as they are typically used in cranes, such as vehicle or crawler cranes.
  • the sensors provided in the piston-cylinder unit supply data which are to be supplied to the crane control in use in a vehicle or crawler crane.
  • the sensor requires energy.
  • Those known from the prior art Connection has great problems, since the cables are usually guided freely and are thus exposed to damage. As far as the connection cables are used in a support of a vehicle or crawler crane, it must be taken into account that these supports are displaced both in the horizontal direction (by the sliding beams) and in the vertical direction (by the supporting cylinders).
  • the object of the invention is to develop a known piston-cylinder unit such that in these provided sensors in a simple and safe manner can be supplied with energy and that the signals generated by the sensors can be transmitted in a simple manner.
  • a piston-cylinder unit is proposed with a piston displaceably mounted in a cylinder with subsequent piston rod, in which the piston and the piston rod have a cavity in which projects at least one rod over which directly or indirectly an electrically conductive connection can be made ,
  • the inner side of the piston rod can be coated over at least part of its length with an insulator layer, on the outside of which, in turn, a conductive layer is applied.
  • a rod can be arranged in the cavity of the piston and the piston rod, on which a conductive layer is applied.
  • the rod provided with an electrical connection may be secured to the top of the cylinder and immersed in the cavity of the piston rod and the piston, wherein the rod is electrically connected to the conductive layer in the piston rod.
  • This electrical connection may advantageously consist of a spring-loaded sliding connection.
  • a rod provided with an electrical connection and secured to the top of the cylinder may comprise an insulator layer, the rod optionally located in the cavity of the piston and the piston rod being inserted into the hollow rod fixed to the top of the cylinder.
  • an electrical insulation is provided between the rod and the cylinder wall.
  • At least one sensor is arranged on the electrically conductive regions of the piston rod, which can be supplied with power via the electrical conductors.
  • the measured values of the at least one sensor can be relayed to the existing controller via a voltage modulation of the energy supply and can be evaluated there.
  • the conductive layer on the insulator layer can cover a partial length (a) of the piston rod, so that the electrical contact of the submerged rod is interrupted after leaving the conductive region, wherein the leaving of the conductive region can be detected by a controller ,
  • the conductive layer is selected in a suitable length. If now the piston is pulled too far out of the cylinder, the contact between the rod and the conductive layer is interrupted.
  • the controller receives now in the event that the piston rod has left this defined area, no signal from the at least one sensor within the cylinder.
  • An existing control can be used to start a specific routine, such as the issuing of a warning signal or even an intervention in the control in the form of a movement stop. This can be prevented in a simple manner that the piston-cylinder unit is driven “on block". This "on block” driving the piston-cylinder unit can easily be done by using a piston-cylinder unit in the support of a vehicle or crawler crane in that the crane driver extends the cylinder very far, so that it is "on block” ,
  • an optical displacement sensor with associated central unit may be provided, via which the power supply of downstream sensors takes place.
  • the displacement sensor can pick up the voltage modulated by the sensors and provide it via a bus connection of the main control in addition to its own measurement results.
  • the sensors can measure, for example, the support force of a support plate of a support device of a vehicle crane.
  • a vehicle crane 10 is shown with an extended sliding beam 12.
  • the extendable sliding beam 12 has a piston-cylinder unit 14, at the free end of a support plate 16 is arranged for support on the ground.
  • a force sensor 18 is arranged in the piston-cylinder unit 14.
  • the inventive construction of the piston-cylinder unit 14 results from the Fig. 2 to 4 ,
  • the piston-cylinder unit 14 consists essentially of a cylinder 100, a piston 110 and a subsequent thereto piston rod 120.
  • the support plate 16 and a force sensor 18 arranged to measure the supporting force.
  • an electrically conductive rod 130 is attached and guided to the outside of the cylinder 100.
  • the rod 130 is connected to an electrical terminal 132 (see FIG Fig. 4 ).
  • an electrical insulation 131 is provided between the cylinder wall of the cylinder 100 and the rod 130.
  • Both the piston 110 and the piston rod 120 have an opening or a cavity into which the rod 130, as in FIG Fig. 2 and Fig. 4 is shown immerses.
  • the functionality of the Piston-cylinder unit the tightness over the intended pressure range in the piston rod against the hydraulic oil to be ensured. This tightness must also be present with respect to the connection of the rod 130 in the cylinder 100 as previously described. An insulation against the hydraulic oil, however, is not necessary, since this is itself electrically non-conductive.
  • the rod 130 protrudes into the cylinder space 102, through the piston 110 and into the interior of the piston rod 120 inside. This interior is either present anyway, since the piston rod is made of a tube or is specially provided.
  • the rod 130 has a length adapted to the recess in the piston rod 120. It protrudes in both the fully extended, as well as in the fully retracted state of the piston rod 120 within the piston-cylinder unit 14 into this.
  • the inside of the piston rod 120 is how it looks Fig. 4 results, provided with an insulator layer 121. On this insulator layer 121, a further conductive layer 122 is applied over a certain length a. Both the conductive layer 122 and the insulator layer 121 may be applied to the inside of the piston rod 120 in a variety of ways. So here on the one hand cylinder or flat materials can be applied. The layers can also be provided by vapor deposition, galvanic methods or the like. In the context of the present invention, the production process for these layers is not important. It is necessary for the invention, however, that here two electrically isolated poles are realized in and on the piston rod 120.
  • connection for example a sliding connection.
  • This connection is in the FIG. 4 simplified represented by the double arrow 90.
  • this can be done via a spring-loaded grinding connection. It does not matter if the abrasive bond is attached to the conductive layer 122 or to the bar 130.
  • the connection can advantageously also serve as additional storage of the rod 130. Also it could be provided at the height of the piston 110, so that the rod 130 can be made very short.
  • two rods can be used.
  • the data generated by the sensors must be passed on to the existing controller. This can be done contactlessly via a remote data transmission in a known manner. For this case, however, other components must be provided.
  • the voltage of the power supply can be modulated in accordance with the respective signal. This modulation is then recorded and evaluated by a controller. For this purpose, significantly fewer and less expensive components are necessary than in the aforementioned remote data transmission. Basically, this type of modulation is already known to the person skilled in the art.
  • a detail of the piston 110 is shown, which abuts the wall of the cylinder 100 via the seals 111 and 112.
  • the seals 111 and 112 may consist of insulators, so that in this case a spring-loaded sliding connection 113 may be provided to establish a secure conductive connection.
  • the length of the conductive layer 122 is selected such that at the same time a monitoring circuit for preventing the excessive extension of the piston 110 from the cylinder and a so-called “Driving on block” is prevented. Namely, the piston 110 is extended too far, then eliminates the conductive connection between the rod 130 and the conductive layer 122.
  • the controller not shown here receives in this case that the piston rod 120 has left the defined area, no signal from the or the sensors at the foot of the support. Thus, a certain routine can be started.
  • the conductive layer 122 and a safety distance adjustable thereby, the "drive to block" to be prevented can be easily and effectively eliminated.
  • Fig. 4 is a first way of limiting the path through an insulator layer 121 a and a second way of Wegbegrenzung realized by an insulator layer 121 b.
  • the movable path results from the freely accessible path for the sliding connection 90 a.
  • the above-described piston-cylinder unit according to the invention can be particularly advantageous in a support in a slide-out sliding beam 12 of a vehicle crane 10, as in Fig. 1 is shown, arrange.
  • a per se known optical sensor 141 may be arranged on Schiebeholmkasten 140, ie on the fixed part of the support.
  • a corresponding reflector 142 is arranged at the Schiebeholm 12 .
  • the optical sensor 141 and the reflector 142 (between themselves wirelessly) determine the extension length of the sliding beam 12.
  • the sliding beam 12 thus only a single line 143 'is required for electrical connection. This line begins at the optical sensor 141.
  • the optical sensor 141 additionally includes a CPU, which receive the signals of the sensor 18 and possibly any other existing sensors from the piston-cylinder unit, process and so on their own bus link 144 of the crane control (here not shown in detail).
  • FIG. 5 and 6 an alternative embodiment of the invention is shown.
  • an alternative constructed piston-cylinder unit 14 is shown, in which the support plate 16 is not mounted for support on the ground.
  • the piston-cylinder unit 14 also consists essentially of a cylinder 100 and a subsequent thereto piston rod 120. Again, a rod 130 is attached to the top of the cylinder.
  • Both the piston rod 120 and the adjoining piston 110 each have an opening or a cavity in which a further rod 135 is arranged.
  • This rod 135 runs, as can be seen from the comparison of Figures 5 and 6 gives, within a cavity, the rod 130 mounted in the cylinder 100.
  • abraded joints 137 are arranged on the piston side rod 135.
  • the power supply to the rod 130 can take place in a manner not shown here.
  • the second electrical contact 141 is realized between the cylinder 100 and the piston rod 120. It is advantageous here that the contact pin not shown here is not in the region of the cylinder space, so the high pressure, but in the region of the annular surface 143, that is, the low pressure takes place.
  • a larger rod would be attached to the top of the cylinder and could project into the piston rod through the piston. Between piston and the larger rod then seals would be provided so that the space of the piston rod is no longer filled with oil. From the bottom of the piston rod, a smaller rod can protrude into the larger rod.
  • the in the Fig. 4 provided contact surfaces would be arranged in this alternative construction in the large bar.
  • the force sensor 18 for measuring the supporting force is to be supplied with energy once and on the other hand, its measurement results are to pass on to the controller.
  • the force sensor is an LSB bus capable transmitter, then both requirements can be provided by a cable with digital signal transmission.
  • a storage capacitor is mounted in the vicinity of the force sensor 18. The capacitor is then charged via the LSB bus during the phase in which voltage is applied and discharged in the phase in which no voltage is present. Then he supplies the force sensor 18 with the required current.
  • the capacitance of the capacitor to the power consumption of the force sensor 18 and to the maximum duration of the dead phase of the transmission protocol in the LSB bus is adjusted.
  • the signal transmission takes place, as already described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Jib Cranes (AREA)

Claims (13)

  1. Unité piston-cylindre (14) comportant un piston (110) avec une tige de piston (120) adjacente, qui est monté de manière coulissante dans un cylindre (100), le piston et la tige de piston comprenant une cavité dans laquelle au moins une tige (130) fait saillie, par laquelle une liaison électriquement conductrice peut être réalisée directement ou indirectement, caractérisée en ce que sur des régions électriquement conductrices de la tige de piston au moins un capteur (18) est agencé, qui peut être alimenté en électricité par les conducteurs électriques.
  2. Unité piston-cylindre selon la revendication 1, caractérisée en ce que la face intérieure de la tige de piston est revêtue d'une couche isolante (121) sur au moins une partie de sa longueur, sur la face extérieure de laquelle une couche conductrice est appliquée à son tour.
  3. Unité piston-cylindre selon la revendication 1, caractérisée en ce que dans la cavité du piston et de la tige de piston une tige (130) est agencée, sur laquelle une couche conductrice (122) est appliquée.
  4. Unité piston-cylindre selon la revendication 2 ou 3, caractérisée en ce que la tige pourvue d'une connexion électrique (132) est fixée à la face supérieure du cylindre et s'enfonce dans la cavité de la tige de piston, la tige étant reliée avec la couche conductrice dans la tige de piston d'une manière électriquement conductrice.
  5. Unité piston-cylindre selon les revendications 3 et 4, caractérisée en ce que la tige pourvue d'une connexion électrique et fixée à la face supérieure du cylindre comprend une couche isolante (121) et que la tige agencée dans la cavité du piston et de la tige de piston plonge dans la tige creuse.
  6. Unité piston-cylindre selon la revendication 4 ou 5, caractérisée en ce que la connexion est constituée d'une connexion glissante (113) sollicitée par un ressort.
  7. Unité piston-cylindre selon l'une quelconque des revendications précédentes, caractérisée en ce qu'entre la tige et la paroi de cylindre une isolation électrique (131) est prévue.
  8. Unité piston-cylindre selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un deuxième contact électrique (141) est réalisé entre le fond du cylindre et la tige de piston.
  9. Unité piston-cylindre selon la revendication 7 ou 8, caractérisée en ce que les valeurs mesurées du au moins un capteur (18) peuvent être transmises à l'unité de commande existante et évaluées là-dedans par une modulation de tension de l'alimentation en énergie.
  10. Unité piston-cylindre selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche conductrice (122) sur la couche isolante (121) recouvre une longueur partielle (a) de la tige de piston de sorte que le contact électrique de la tige plongeante est interrompu après avoir quitté la région conductrice, la sortie de la région conductrice pouvant être détectée par une unité de commande.
  11. Unité piston-cylindre selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un capteur de déplacement, en particulier un capteur optique de déplacement (141), avec une unité centrale de traitement (CPU) associée est prévu, par lequel l'alimentation en tension des capteurs aval est effectuée.
  12. Unité piston-cylindre selon la revendication 11, caractérisée en ce que le capteur de déplacement ramasse la tension modulée par les capteurs et la fournit à l'unité de commande principale par une connexion de bus outre ses propres résultats de mesure.
  13. Unité piston-cylindre selon l'une quelconque des revendications précédentes, caractérisée en ce que le capteur de force (18) est un transducteur compatible avec un bus, qu'un condensateur de stockage est relié au capteur de force, et que la transmission d'énergie et la transmission des valeurs mesurées sont effectuées par le même câble.
EP09010310.2A 2008-08-29 2009-08-10 Unité de cylindre-piston Not-in-force EP2159428B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202008011557 2008-08-29
DE202009004673U DE202009004673U1 (de) 2008-08-29 2009-04-08 Kolben-Zylinder-Einheit

Publications (3)

Publication Number Publication Date
EP2159428A2 EP2159428A2 (fr) 2010-03-03
EP2159428A3 EP2159428A3 (fr) 2012-08-08
EP2159428B1 true EP2159428B1 (fr) 2019-03-06

Family

ID=41606443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09010310.2A Not-in-force EP2159428B1 (fr) 2008-08-29 2009-08-10 Unité de cylindre-piston

Country Status (5)

Country Link
US (1) US8516945B2 (fr)
EP (1) EP2159428B1 (fr)
JP (1) JP5864076B2 (fr)
CN (1) CN101660550B (fr)
DE (1) DE202009004673U1 (fr)

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GB0911016D0 (en) * 2009-06-25 2009-08-12 Airbus Operations Ltd Electrical power transmitting telescopic strut
CN103267803A (zh) * 2013-05-29 2013-08-28 广东工业大学 成形材料在温压可控变化状态下的声学特性检测装置
CN103697015B (zh) * 2013-12-17 2015-10-14 贵州新安航空机械有限责任公司 一种防雷、抗剪切液压缸装置
DE202014000335U1 (de) 2014-01-17 2014-02-24 Tecsis (Shenzhen) Sensors Co., Ltd. Meßsystem zur Ermittlung von Stützkräften
EP3096119B1 (fr) 2014-01-17 2022-03-02 Tecsis GmbH Système de mesure permettant de déterminer une force de support
DE202014000334U1 (de) 2014-01-17 2014-02-25 Tecsis (Shenzhen) Sensors Co., Ltd. Stützkraftmesseinrichtung mit Induktionskopplung
DE202014000337U1 (de) 2014-01-17 2014-02-24 Tecsis (Shenzhen) Sensors Co., Ltd. Meßsystem zur Ermittlung von Stützkräften mit Funkschnittstelle
DE102016113510A1 (de) 2016-07-21 2018-01-25 Weber Hydraulik Gmbh Zylinder/Kolben-Aggregat für eine Stütze
EP3335948B1 (fr) 2016-12-15 2019-09-25 Alois Kober GmbH Dispositif béquille de levage doté d'un dispositif de sécurité
CN107191432A (zh) * 2017-07-28 2017-09-22 南通铁人运动用品有限公司 一种可实时监测绝对位置的中空活塞杆气缸
CN110594232B (zh) * 2019-09-19 2020-12-01 墙煌新材料股份有限公司 一种叶片式防运输温度不一反冲液压马达
DE102020101615A1 (de) * 2020-01-23 2021-07-29 Weber-Hydraulik Gmbh Zylinderkolbenaggregat mit integriertem Kraftmesssystem

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Also Published As

Publication number Publication date
DE202009004673U1 (de) 2010-01-28
JP2010052945A (ja) 2010-03-11
JP5864076B2 (ja) 2016-02-17
US8516945B2 (en) 2013-08-27
CN101660550B (zh) 2016-08-03
EP2159428A3 (fr) 2012-08-08
EP2159428A2 (fr) 2010-03-03
US20100050864A1 (en) 2010-03-04
CN101660550A (zh) 2010-03-03

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