EP3272696B1 - Module cylindre/piston pour un support - Google Patents

Module cylindre/piston pour un support Download PDF

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Publication number
EP3272696B1
EP3272696B1 EP17178260.0A EP17178260A EP3272696B1 EP 3272696 B1 EP3272696 B1 EP 3272696B1 EP 17178260 A EP17178260 A EP 17178260A EP 3272696 B1 EP3272696 B1 EP 3272696B1
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EP
European Patent Office
Prior art keywords
cylinder
piston
hydraulic
piston rod
unit according
Prior art date
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Application number
EP17178260.0A
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German (de)
English (en)
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EP3272696A1 (fr
Inventor
Roman Weidemann
Mehdi Javdanitehran
Thorsten Brecht
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.)
Weber Hydraulik GmbH Germany
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Weber Hydraulik GmbH Germany
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Publication of EP3272696A1 publication Critical patent/EP3272696A1/fr
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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
    • B66C23/62—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
    • 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 present invention relates to a cylinder / piston unit, in particular for a support, which has a hydraulic cylinder with a cylinder chamber and a longitudinally movable piston, wherein the piston carries a piston rod, which is at least partially hollow.
  • an electrical signal line can be guided, via which a force sensor integrated in the piston rod can be read out.
  • the electrical signal line is designed as a spiral cable and leads from the piston rod through an opening in the piston in the cylinder chamber filled with hydraulic fluid and through it to the end of the hydraulic cylinder facing away from the piston, where the signal line via an electrical feedthrough from the cylinder / piston unit exits and leads from there to an evaluation device.
  • the Japanese Utility Model JP S58-137695 U shows a support cylinder for a work machine.
  • a sensor is arranged on the underside of the piston, on which the formed in the manner of a piston rod, internally hollow support base is supported.
  • a connecting line hangs freely from the bottom of the cylinder through the piston into the support foot leading and telescopically in this insertable inner tube into the fetch support leg and leads to the sensor.
  • an inner tube extending through the cylinder space is provided, which protrudes into the at least partially hollow piston rod via a bore in the piston and can be pushed telescopically into it.
  • the inner tube on the piston and / or the hollow piston rod against the cylinder chamber sealed and forms together with the hollow piston rod a hydraulic fluid-free interior through which a signal transmission can take place.
  • a sensor is arranged at the distal end of the piston rod, in particular a force sensor which generates a support force-dependent signal, which is transmitted through the hydraulic fluid-free interior.
  • the hydraulic fluid-filled cylinder space is thus formed by the annular space surrounding the inner tube. Accordingly, the piston is annular and sealed against both the cylinder inner wall and the inner tube.
  • an outer piston ring for sealing the piston relative to the cylinder inner wall piston and piston rod can of course also be designed as a so-called plunger and sealed by means of a so-called stuffing box seal on the cylinder head.
  • a wireless signal transmission path extends through the hydraulic fluid-free interior a wireless signal transmission path.
  • the wireless signal transmission path can be designed, for example, as an optical free-space transmission path, in particular an infrared transmission path. As such, it is simple and inexpensive to implement.
  • While a cable connection and also a connection via sliding contacts is susceptible to signal interruptions, for example caused by cable breakage due to material fatigue due to frequent disassembly and contraction, or due to contact difficulties of the sliding contacts, for example due to corrosion or wear of the sliding contacts, is a wireless transmission in the hydraulic fluid-free interior safely protected against signal loss. Also, the risk of a short circuit caused by fatigue is reduced.
  • a multi-channel signal transmission can be achieved by a simple modulation, which is much easier than to install several sliding contacts in the piston rod.
  • one is Wireless connection compared to sliding contacts associated with less technical effort.
  • an electrical line can be laid by the hydraulic fluid-free interior. This is preferably designed so that the length of the electrical line automatically adapts to the stroke of the piston. This can preferably be realized by means of a spiral cable.
  • Such an electrical line can in principle also serve for data transmission through the cylinder / piston unit, but in combination with a wireless signal transmission path, the electrical line can be used as a pure electrical supply line for supplying power to an electrical circuit arranged at the distal end of the piston rod. For example, a transmitter / receiver and / or a sensor with associated control circuit, be formed.
  • the cylinder / piston assembly is used in a hydraulic support of a mobile work machine and allows monitoring of the support forces transmitted via the support.
  • the sensor and an associated control circuit in particular a microcontroller, are supplied with operating voltage via an electrical supply line extending through the hydraulic medium-free interior, or alternatively wirelessly.
  • the present invention also relates to a hydraulic support for supporting work machines, with a cylinder / piston unit of the type mentioned above.
  • a Stützfußfuß is arranged, wherein in the column base or the piston rod, a force sensor for determining the support acting supporting forces is integrated.
  • the force sensor can be read out via the hydraulic fluid-free interior.
  • FIG. 1 schematically shown crane vehicle has laterally extended support arm 1, at the free end of each a hydraulic support is arranged.
  • the vertically extending hydraulic support comprises a hydraulic cylinder 2 with a downwardly directed piston rod 3, at whose lower end a joint head 5 is arranged.
  • a force sensor 4 is integrated above the joint head 5, with the aid of which a proportional to a supporting force or at least dependent on a supporting force measuring signal can be generated.
  • a force sensor is often referred to as a force transducer.
  • the condyle 5 forms a ball-jointed connection to a support leg 6, in that the condyle 5 is received by a socket formed on the support leg 6.
  • the support arms 1 are laterally extendable or swung out in a conventional manner, so that the crane vehicle can be supported laterally by extending the hydraulic cylinders 2 when the support arms are extended or swiveled out. For transport, however, the support arms are pushed or pivoted into a transport position.
  • the force sensor 4 integrated into the end of the piston rod 3 can be arranged, for example, within a receiving bushing formed on the lower end of the piston rod 3, into which a journal movable in the bushing is inserted "floating", at the lower end of which the condyle 5 is located.
  • a receiving bushing formed on the lower end of the piston rod 3, into which a journal movable in the bushing is inserted "floating", at the lower end of which the condyle 5 is located.
  • measured values of the force sensor 4 are transmitted through piston rod 3 and hydraulic cylinder 2 to an evaluation device arranged on the support arm 1 or inside the crane vehicle, at least remote from piston rod end and support leg 6, respectively.
  • the transmission of the measured values from the force sensor 4 is effected by a hydraulic medium-free interior, which is formed by the piston rod 3, which is hollow at least in sections for this purpose, and an inner tube 8 which can be inserted telescopically and penetrates the cylinder space in the longitudinal direction.
  • FIG. 2 An embodiment of such a cylinder / piston unit with hydraulic fluid-free interior is in FIG. 2 shown in a longitudinal section.
  • the cylinder / piston unit comprises a hydraulic cylinder 2, in whose hydraulic fluid-filled cylinder space a longitudinally movable piston 7 is arranged in this.
  • the piston 7 is sealed via one or more outer piston rings (not shown) with respect to the inner wall of the hydraulic cylinder in a conventional manner.
  • the downwardly facing piston rod 3 is arranged and protrudes on the cylinder head via a corresponding bottom opening in the hydraulic cylinder 2, which may also be provided with a hydraulic seal and / or scrapers, out of this down.
  • the piston rod 3 By pressurization or supply of hydraulic fluid in the hydraulic chamber above the piston 7, the piston rod 3 is extended, retracted by discharging hydraulic fluid from the upper hydraulic chamber or supplying hydraulic fluid into the hydraulic chamber below the piston 7 again.
  • the piston rod 3 is partially, namely provided by the arranged at its lower end force sensor 4 to the piston 7 with a central longitudinal bore 3 ', which also extends through the piston 7 in the longitudinal direction.
  • the piston rod 3 is hollow inside.
  • a centrally extending along its longitudinal axis inner tube 8 is also arranged, which protrudes telescopically into the central longitudinal bore 7 'in the piston 7 and further into the central longitudinal bore 3' of the piston rod 3.
  • the inner tube 8 is sealingly sealed via a hydraulic seal 9 inserted in the piston 7, for example an inner piston ring. The inner tube 8 is thus inserted telescopically into the hollow piston rod 3 when the piston 7 retracts.
  • the inner tube 8 is guided via a corresponding bore to the outside and secured there.
  • a seal 10 seals the connection between the inner tube 8 and the outlet bore at the upper end of the hydraulic cylinder.
  • the longitudinal bores 3 ', 7' by piston 7 and piston rod 3 together with the telescopically insertable inner tube 8 into this hydraulic fluid-free, compared to the hydraulic chamber of the hydraulic cylinder 2 fluidically sealed interior, are transmitted by the measuring signals of the force sensor 4.
  • an infrared transmission path which is formed by an infrared transmitter 20, an infrared receiver 21, a transmitter-side control circuit 22 and a receiver-side control circuit 23.
  • a connected to the spiral cable 11 terminal 12 which is connected to a power source, and connected to the receiver-side control circuit 23 signal terminal 13 for the measurement signals of the force sensor 4 from.
  • the signal terminal 13 is connected directly or via further circuit parts with an evaluation device, while the power connector 12 is connected as mentioned with a power source.
  • Such an energy transmission path comprises a (micro) wave generator coupled to a transmitter in the column base 6.
  • a microwave receiver and a rectifier are provided, which the transmit converted microwave energy into a DC voltage for the supply of sensor 4 and control circuit 22.
  • FIG. 3 A block diagram of an infrared transmission path, as used in the interior of the hydraulic fluid-free interior, is shown schematically in FIG. 3 shown. That from the sensor 4 FIG. 2 The upcoming load-bearing-dependent analog measurement signal is applied to the input of an analog-to-digital converter 22a.
  • the digital outputs of the analog-to-digital converter 22a are connected to a transmission-side control circuit 22b, to which an infrared transmitter 20, for example in the form of an infrared light-emitting diode, is connected.
  • the transmitter-side control circuit 22b converts the digital signals coming from the analog-to-digital converter 22a into digital communication signals, which are transmitted from the infrared transmitter 20 in the form of short light pulses via the free space transmission path 24 to an infrared receiver 21.
  • the infrared receiver 21 for example in the form of an infrared-sensitive photodiode, is connected to a receiver-side control circuit 23a, which evaluates the light pulses received from the infrared receiver 21 and converted into electrical signals on the basis of the transmission protocol used and extracts the transmitted digital data representing the measurement signal of the force sensor 4 , These can then optionally be given via a corresponding digital output of the receiver-side control circuit 23a to a digital-to-analog converter 23b, which again generates an analog measurement signal which corresponds to the measurement signal originally output by the force sensor 4.
  • the digitized measurement signal can also be output on the data line 13 at the upper end of the hydraulic cylinder 2 for further processing in an evaluation device, or the signal can be converted into various other types of digital signals.
  • optical free-space transmission methods can also be used, for example in the visible Spectral range, are used.
  • wireless signal transmission methods such as a high-frequency range short-range radio transmission conceivable.
  • An acoustic signal transmission through the hydraulic means-free interior, for example in the ultrasonic range is possible in the context of the present invention.
  • the signal transmission between the sensor 4 and the evaluation device takes place unidirectionally, so that only measured values of the sensor 4 can be transmitted to the evaluation device.
  • bidirectional signal transmission is also possible and included within the scope of the present invention, so that control commands and acknowledgments can also be transmitted to the sensor 4 and its associated control circuit 22.
  • a transmitter and receiver with associated control circuits would be arranged on both the side of the sensor 4 and on the far side of the hydraulic cylinder.
  • a duplex transmission path has the advantage that this can be ensured by means of an 'acknowledgment function' a complete or error-free transmission.
  • An example of such an acknowledgment function would be the following communication:
  • the transmitter sends out signals in the form of a data packet (e.g., value: 12345, binary value: 011000000111001, number of bits sent: 15).
  • the receiver sends back a signal to the transmitter and determines how many bits (here: 15) were received.
  • the transmitter checks if all values (15 bits) have been completely transmitted. If so, the sender sends the next signal, if not, the erroneously received packet is resent.
  • the spiral cable 11 which is also guided by the hydraulic fluid-free interior of the cylinder / piston unit, only the power supply of sensor 4 and control circuit 22.
  • the wireless signal transmission of the measuring signals by the hydraulic fluid-free interior of the cylinder / piston unit ensures a particularly robust and trouble-free readout of the sensor 4, as well as a galvanic decoupling of the following evaluation on board the crane vehicle from the burdening on the ground pillar foot 6.
  • a wireless signal transmission is of course in addition to a wired power supply and signal transmission through a corresponding extending through the hydraulic fluid-free interior signal line possible and in Within the scope of the present invention.
  • a load cell can be used. Such serves as a load cell for the measurement of compressive forces and can be formed for example by a spring body load cell with ring torsion spring.
  • a toroidal deformation body is disposed within the load cell, which is acted upon on its inner side with force and attached to its outer side on the thrust bearing of the load cell. Due to the load, the ring torsion spring undergoes a torsion, by which it is compressed at the top and stretched at the bottom. About strain gauges, which are attached to the top and bottom of the ring torsion spring, this deformation can be measured.
  • the load cell can also be formed by a hollow body expansion cylinder.
  • other types of force transducers such as piezo force transducers or resistance force transducers, can be used in the context of the present invention.
  • a corresponding electrical circuit and evaluation device for reading the force transducer can either be arranged externally and be connected via appropriate, guided by the hydraulic fluid-free interior of the cylinder / piston unit electrical signal lines to the force transducer or alternatively be located above the force transducer in an overlying receiving space.
  • a cylinder / piston assembly of the type described above can be used as a support member in all types of work machines, especially in mobile work equipment where support is required.

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

Claims (9)

  1. Vérin notamment destiné à un étai, comprenant un cylindre hydraulique (2) muni d'une chambre cylindrique, et un piston (7) doué de mobilité longitudinale dans ladite chambre et portant une tige (3), ladite tige (3) du piston étant de réalisation creuse, au moins par zones, sachant
    qu'il est prévu un tube intérieur (8) qui parcourt la chambre cylindrique, pénètre dans la tige (3) du piston, creuse au moins par zones, par l'intermédiaire d'un alésage (7') pratiqué dans ledit piston (7), et peut être introduit télescopiquement dans ladite tige, et sachant que ledit tube intérieur (8) est rendu étanche, par rapport à ladite chambre cylindrique, sur ledit piston (7) et/ou sur la tige creuse (3) dudit piston avec laquelle il forme un espace interne exempt de fluide hydraulique,
    caractérisé par le fait
    qu'un capteur (4), en particulier un capteur de forces implanté à l'extrémité distale de la tige (3) du piston, engendre un signal dépendant de la force d'appui et transmis en parcourant l'espace interne exempt de fluide hydraulique.
  2. Vérin selon la revendication 1, dans lequel un trajet (24) de transmission de signaux sans fil parcourt l'espace interne exempt de fluide hydraulique.
  3. Vérin selon la revendication 2, dans lequel le trajet (24) de transmission de signaux est réalisé en tant que trajet de transmission optique en espace libre, notamment en tant que trajet de transmission par infrarouges.
  4. Vérin selon l'une des revendications précédentes, dans lequel un conducteur électrique (11) parcourt l'espace interne exempt de fluide hydraulique.
  5. Vérin selon la revendication 4, dans lequel le conducteur électrique est réalisé sous la forme d'un câble spiroïdal.
  6. Vérin selon la revendication 4 ou 5, dans lequel le conducteur électrique est un conducteur d'alimentation électrique au sens propre.
  7. Vérin selon l'une des revendications 1 à 3, dans lequel des moyens sont prévus pour le transfert d'énergie, sans fil, à un circuit électrique (4, 22) disposé à l'extrémité de la tige (3) du piston.
  8. Vérin selon la revendication 7, dans lequel le capteur (4) et un circuit de commande (22) associé, en particulier un microcontrôleur, sont alimentés en tension de service par l'intermédiaire d'un conducteur d'alimentation électrique (11) parcourant l'espace interne exempt de fluide hydraulique.
  9. Etai hydraulique conçu pour procurer un appui à des machines de travail, comprenant un vérin conforme à l'une des revendications précédentes, un piètement d'appui (6) disposé à l'extrémité de la tige du piston, et un capteur de forces (4) intégré dans ledit piètement d'appui (6) ou dans ladite tige (3) du piston, en vue de déterminer des forces d'appui agissant sur ledit étai (2, 3), lequel capteur de forces (4) peut être interprété par le biais de l'espace interne exempt de fluide hydraulique.
EP17178260.0A 2016-07-21 2017-06-28 Module cylindre/piston pour un support Active EP3272696B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016113510.0A DE102016113510A1 (de) 2016-07-21 2016-07-21 Zylinder/Kolben-Aggregat für eine Stütze

Publications (2)

Publication Number Publication Date
EP3272696A1 EP3272696A1 (fr) 2018-01-24
EP3272696B1 true EP3272696B1 (fr) 2019-08-07

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EP17178260.0A Active EP3272696B1 (fr) 2016-07-21 2017-06-28 Module cylindre/piston pour un support

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EP (1) EP3272696B1 (fr)
DE (1) DE102016113510A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020101615A1 (de) * 2020-01-23 2021-07-29 Weber-Hydraulik Gmbh Zylinderkolbenaggregat mit integriertem Kraftmesssystem

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412391A (en) * 1964-10-31 1968-11-19 Gullick Ltd Pressure-fluid-operated devices and means for indicating the condition thereof
AT312319B (de) * 1967-12-30 1973-12-27 Joseph Anton Bachmann Vorrichtung zur Stellwegmessung bei einer Kolben-Zylinder-Einheit von Werkzeugmaschinen od.dgl.
JPS58137695U (ja) * 1982-03-12 1983-09-16 新明和工業株式会社 ブ−ムを有する車輌の転倒警報装置
US4803318A (en) * 1988-01-07 1989-02-07 Lymburner Robert K Proximity switch for a cylinder
US4879440A (en) * 1988-01-07 1989-11-07 Lymburner Robert K Proximity switch for a cylinder
JPH11292499A (ja) * 1998-04-10 1999-10-26 Toyota Autom Loom Works Ltd フォークリフトのリフトシリンダ及びマスト装置
DE202009004673U1 (de) 2008-08-29 2010-01-28 Liebherr-Werk Ehingen Gmbh Kolben-Zylinder-Einheit
WO2013120118A1 (fr) * 2012-02-13 2013-08-22 Palfinger Ag Dispositif d'appui pour un véhicule
DE202014000335U1 (de) 2014-01-17 2014-02-24 Tecsis (Shenzhen) Sensors Co., Ltd. Meßsystem zur Ermittlung von Stützkräften
US10453978B2 (en) 2015-03-12 2019-10-22 International Business Machines Corporation Single crystalline CZTSSe photovoltaic device

Non-Patent Citations (1)

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Title
None *

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Publication number Publication date
DE102016113510A1 (de) 2018-01-25
EP3272696A1 (fr) 2018-01-24

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