EP2093430A1 - Elektrohydraulische Vorrichtung mit elektronischer Steuerung und Steuerungssystem einer elektrohydraulischen Vorrichtung zur Verformung von Befestigungselementen - Google Patents

Elektrohydraulische Vorrichtung mit elektronischer Steuerung und Steuerungssystem einer elektrohydraulischen Vorrichtung zur Verformung von Befestigungselementen Download PDF

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Publication number
EP2093430A1
EP2093430A1 EP08101963A EP08101963A EP2093430A1 EP 2093430 A1 EP2093430 A1 EP 2093430A1 EP 08101963 A EP08101963 A EP 08101963A EP 08101963 A EP08101963 A EP 08101963A EP 2093430 A1 EP2093430 A1 EP 2093430A1
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EP
European Patent Office
Prior art keywords
screw
subjected
casing
incompressible fluid
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.)
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Application number
EP08101963A
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English (en)
French (fr)
Inventor
Giuseppe Preti
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OBER SpA
Original Assignee
OBER SpA
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Filing date
Publication date
Application filed by OBER SpA filed Critical OBER SpA
Publication of EP2093430A1 publication Critical patent/EP2093430A1/de
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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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0007—Tools for fixing internally screw-threaded tubular fasteners
    • B25B27/0014—Tools for fixing internally screw-threaded tubular fasteners motor-driven

Definitions

  • the present invention relates to the technical sector concerning the activation, control and regulation of hydraulic actuators, with special reference to hydraulic actuators comprised in riveting machines.
  • the prior art comprises hydraulic actuators of very different types, designed for performing many and various technical/industrial operations, which have in common the fact that they necessitate controlled supply of pressurised incompressible fluid, usually oil, which is used for the respective technical functions.
  • Normally riveters are used for plastic deformation of rivets exhibiting a cylindrical shape, a partially-threaded axial hole and a specially weakened portion, in which the plastic deformation is made, the rivets being frequently used for stably joining at least two walls, for example two sheets.
  • the rivet must first be stably connected to mechanical deforming organs, comprised in the riveter, which is done with a male threaded element for the purpose, which is located at the mouth of the threaded hole of the rivet and set in right-directed rotation by a special pneumatic motor.
  • pneumatic-hydraulic type riveters are widely used i.e. riveters which are structured such that they exhibit a hydraulic section for the riveting operation actuation and a pneumatic section for activation and control of the hydraulic part, the pneumatic section also comprising the pneumatic motor.
  • the pneumatic section is connected to a source of compressed air and comprises a plurality of special valves activated by a user, by means of special control means, such as to enable the compressed air both to supply the pneumatic motor and, later, to act on an internal thrust element in the riveter, for example a piston, such as to move it in order for it to press on a hydraulic fluid, contained in the hydraulic section, producing an abrupt increase in pressure, which is transformed by the deforming organs into mechanical force in order to produce, in ways which are widely known by experts in the field, the deformation of the rivet which had previously been inserted in a special hole made in two or more sheets, so as to complete the riveting operation.
  • special control means such as to enable the compressed air both to supply the pneumatic motor and, later, to act on an internal thrust element in the riveter, for example a piston, such as to move it in order for it to press on a hydraulic fluid, contained in the hydraulic section, producing an abrupt increase in pressure, which is transformed by the deforming organs into mechanical force in order to produce, in
  • the pneumatic section represents an excellent activation and deactivation device for the hydraulic actuator, in the example the hydraulic section described above, but cannot constitute an effective and even efficient regulation device of the functioning of the hydraulic actuator.
  • the functioning of the pneumatic activating device of the above-described type is substantially based on a predetermined switching plan of the valves comprised therein and on a specific volume of air at a given pressure introduced therein with the consequence that the device itself can be controlled effectively by the user only in terms of its passage from the non-active state to the active state and vice versa, while its intermediate operative states can be established only approximatively by the user, by varying the volume of compressed air or the relative thermodynamic properties.
  • the known type of activation device can be controlled to excellent effect only in the context of an "all or nothing" operating mode.
  • an electrical-hydraulic device as described in claim 1, with a electronic control and regulation system of a hydraulic actuator for deforming fastening elements, which device comprises:
  • a first advantageous technical result which can be attained with the use of the present technical solution consists in the fact that the device itself is able to control a hydraulic actuator such as to obtain a true and proper regulation of the functioning thereof, differently to the prior art, in which a user is only able to activate or deactivate a given hydraulic actuator.
  • the invention during its operation, produces a specific variation in the incompressible fluid, for example oil, used in the hydraulic actuator, which variation is a function (as previously mentioned) of predetermined parameters, which can, for example, be established by the user of the device using the normal piloting and interfacing means, known to an expert in the field.
  • the device can be advantageously used for controlling and regulating almost any type of hydraulic actuator comprised in a very wide range of industrial or domestic utensils.
  • the device can produce a graduation of the pressure to which the above-mentioned incompressible fluid is subjected, in a way which is regulated by the user, all of which means that this device does not have to be destined for and implemented for a single specific type of hydraulic actuator requiring a respective and special pressure range for the incompressible fluid used therein.
  • 1 denotes an electrical/hydraulic device equipped with an electronic control and regulation system of a hydraulic actuator 21 for deforming fastening elements, which device 1 comprises:
  • a type of hydraulic actuator 21 to which the device 1 of the invention can be associated is the actuator comprised in an electro-hydraulic riveter 2, to which receiving chamber the supply chamber 4 is hydraulically connected by means of, for example, a tube 22.
  • the fastening elements to which reference is made are common rivets.
  • the kinematic means 6 comprise:
  • the screw 62 is engaged with a nut screw 52, for example of a re-circulating ball type, solidly constrained to the stem 51 and also comprised in the presser element 5 as described above, in such a way that according to the input electrical signal the brushless motor 61 impresses a torsional torque on the screw 62 which torsional torque produces a corresponding variation in the mechanical force to which the nut screw 52, and therefore the stem, is subjected, causing a specific change in pressure acting on the incompressible fluid.
  • a nut screw 52 for example of a re-circulating ball type
  • the means for connecting 63 comprise:
  • the joint 631 can, for example, comprise a gear reducer.
  • a specific value of the supply current of the motor 61 is set, so that the motor 61 impresses a respective and predetermined torsional torque on the screw 62, via the means for connecting 63, to which torsional torque corresponds a change in the force applied to the stem 51, with a consequent and abrupt change in the oil pressure.
  • the rivet When the oil pressure has reached a sufficient level to deform the rivet, the rivet is subjected to a progressive reduction in the longitudinal dimension thereof, due to the deformation mentioned above, to which corresponds a progressive increase in the volume available for receiving the oil of the receiving chamber, comprised in the hydraulic actuator 21; which is followed by a progressive reduction in the oil contained in the supply chamber 4, which passes into the receiving chamber through the tube 22, during which reduction the screw 62 rotates, causing the nut screw to translate along the longitudinal development thereof, enabling penetration of the stem 51 internally of the chamber 4, which stem 51 goes to occupy the internal volume which is gradually left emptied of oil.
  • the motor 61 can be controlled to impress on the screw 62 an inverse torsional torque to the torsional torque which produces the riveting operation, producing a translation of the nut screw 52 along the screw 62, such as to bring the stem 51 to progressively translate from the inside of the chamber 4, through the opening 42.
  • the stem 51 is moveable in order to be arranged in any position comprised between an extreme position of minimum volume occupation of the supply chamber 4 and an extreme position of maximum volume occupation of the chamber 4.
  • the device 1 can include, in the preferred embodiment, two end-run sensors 31 and 32 associated to the casing 3 and respectively detecting the position of the nut screw 52, along the screw 62, corresponding to the minimum volume occupation position of the stem 51, and the position of the nut screw 52 corresponding to the position of the maximum volume occupation.
  • At least an anti-rotation element 521 is associated to the nut screw 52, which anti-rotation element 521 engages with a guide afforded in the casing 3, such that the rotation of the screw 62 produces an exclusively-translating movement of the nut screw 52 along the screw 62, during which movement the nut screw 52 is rotationally fixed with respect to the casing 3.
  • the invention advantageously includes a tank 8, associated to the casing 3, containing a determined quantity of oil and destined to be placed in hydraulic communication with the inside of the chamber 4 via an opening 44, in order to supply the chamber 4 with oil contained in the tank 8, such that the operator can predetermine or establish how much oil should be present in the chamber 4, the receiving chamber and the tube.
  • the opening 44 is preferably arranged in proximity of the access opening 42, such that when the stem 51 is moved to progressively penetrate internally of the chamber 4, starting from the minimum volume occupation position, as mentioned above, the hydraulic communication between the tank 8 and the chamber 4 is interrupted by the passage of a predetermined portion of the stem 52 through the opening 42; in this way there is the complete certainty that during functioning of the device 1 the quantity of oil is kept constant, such as to ensure absolute correspondence between the electric input signal and a respective functioning mode of the riveter 2, on the basis of a special calibration of the device 1 made for a specific riveter associated thereto.
  • the supply chamber 4 further comprises an inspection opening 43 for hydraulic communication with at least a manostat 7, for example of a digital type, which continuously monitors the pressure of the oil contained internally of the supply chamber 4 itself.
  • a manostat 7 for example of a digital type, which continuously monitors the pressure of the oil contained internally of the supply chamber 4 itself.
  • This detail can be used for periodic control of the oil pressure, for detecting malfunctioning, for calibration or for connecting an outlet of the manostat with a special control unit (not illustrated) which pilots the inlet current of the motor 61, so as to obtain a negative retroacting device which can optimise and stabilise the current value in input to the motor 61, with respect to the consequent oil pressure level, according to the specific regulation of the functioning of the riveter which the user of the device of the invention intends to obtain.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Device For Special Equipments (AREA)
EP08101963A 2008-02-21 2008-02-25 Elektrohydraulische Vorrichtung mit elektronischer Steuerung und Steuerungssystem einer elektrohydraulischen Vorrichtung zur Verformung von Befestigungselementen Withdrawn EP2093430A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBO20080116 ITBO20080116A1 (it) 2008-02-21 2008-02-21 Dispositivo elettro-idraulico con sistema elettronico di controllo e di regolazione di un attuatore idraulico per la deformazione di elementi di fissaggio

Publications (1)

Publication Number Publication Date
EP2093430A1 true EP2093430A1 (de) 2009-08-26

Family

ID=40291437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08101963A Withdrawn EP2093430A1 (de) 2008-02-21 2008-02-25 Elektrohydraulische Vorrichtung mit elektronischer Steuerung und Steuerungssystem einer elektrohydraulischen Vorrichtung zur Verformung von Befestigungselementen

Country Status (3)

Country Link
EP (1) EP2093430A1 (de)
IT (1) ITBO20080116A1 (de)
WO (1) WO2009103694A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011026944A1 (de) * 2009-09-04 2011-03-10 Böllhoff Verbindungstechnik GmbH Elektromotorischer hydraulikantrieb und verfahren zum bereitstellen eines definierten hvdraulikdrucks und/oder -volumens

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2040001A1 (de) * 1970-08-12 1972-02-17 Hanning Elektro Werke Elektromotorische Spindelverstelleinrichtung
DE3606103A1 (de) * 1986-02-26 1987-08-27 Festo Kg Vorrichtung zur fluidischen uebertragung einer kraft oder einer vorschubbewegung
US4872310A (en) * 1986-12-12 1989-10-10 British Aerospace, Plc Electro-hydraulic actuator assembly
US5000649A (en) * 1983-02-15 1991-03-19 Deep Ocean Engineering Incorporated Electromechanical manipulator assembly
DE4017960A1 (de) * 1990-06-05 1991-12-12 Fibron Gmbh Elektrohydraulisches regelventil
JPH10148201A (ja) * 1996-11-18 1998-06-02 Koyo Seiko Co Ltd 負荷装置
US6230492B1 (en) * 1996-08-30 2001-05-15 Kelsey-Hayes Company Electrically actuated hydraulic power cylinder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2040001A1 (de) * 1970-08-12 1972-02-17 Hanning Elektro Werke Elektromotorische Spindelverstelleinrichtung
US5000649A (en) * 1983-02-15 1991-03-19 Deep Ocean Engineering Incorporated Electromechanical manipulator assembly
DE3606103A1 (de) * 1986-02-26 1987-08-27 Festo Kg Vorrichtung zur fluidischen uebertragung einer kraft oder einer vorschubbewegung
US4872310A (en) * 1986-12-12 1989-10-10 British Aerospace, Plc Electro-hydraulic actuator assembly
DE4017960A1 (de) * 1990-06-05 1991-12-12 Fibron Gmbh Elektrohydraulisches regelventil
US6230492B1 (en) * 1996-08-30 2001-05-15 Kelsey-Hayes Company Electrically actuated hydraulic power cylinder
JPH10148201A (ja) * 1996-11-18 1998-06-02 Koyo Seiko Co Ltd 負荷装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011026944A1 (de) * 2009-09-04 2011-03-10 Böllhoff Verbindungstechnik GmbH Elektromotorischer hydraulikantrieb und verfahren zum bereitstellen eines definierten hvdraulikdrucks und/oder -volumens

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Publication number Publication date
ITBO20080116A1 (it) 2009-08-22
WO2009103694A1 (en) 2009-08-27

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