WO2007116421A1 - Actionneur hydraulique multiplicateur d'effort - Google Patents

Actionneur hydraulique multiplicateur d'effort Download PDF

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Publication number
WO2007116421A1
WO2007116421A1 PCT/IT2006/000245 IT2006000245W WO2007116421A1 WO 2007116421 A1 WO2007116421 A1 WO 2007116421A1 IT 2006000245 W IT2006000245 W IT 2006000245W WO 2007116421 A1 WO2007116421 A1 WO 2007116421A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
chamber
stem
oil
pushing
Prior art date
Application number
PCT/IT2006/000245
Other languages
English (en)
Inventor
Roberto Fretta
Original Assignee
O.M.G. S.R.L.
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 O.M.G. S.R.L. filed Critical O.M.G. S.R.L.
Priority to PCT/IT2006/000245 priority Critical patent/WO2007116421A1/fr
Publication of WO2007116421A1 publication Critical patent/WO2007116421A1/fr

Links

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
    • F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/022—Systems essentially incorporating special features for controlling the speed or actuating force of an output member in which a rapid approach stroke is followed by a slower, high-force working stroke
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
    • 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
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • 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
    • F15B15/088—Characterised by the construction of the motor unit the motor using combined actuation, e.g. electric and fluid actuation
    • 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
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
    • 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
    • F15B2015/1495—Characterised by the construction of the motor unit of the straight-cylinder type with screw mechanism attached to the piston

Definitions

  • the present invention refers to a force-multiplying hydraulic actuator.
  • actuators are known in the art, both of the electro-mechanical and of the hydraulic type. These latter ones have provided a better solution from the point of view of increasing the force with variable multiplying ratios upon their sizing.
  • An example of known actuator allows realising variable multiplying ratios from at least two and up to a maximum of five times the recirculation screw reaction. It is therefore possible to use screws in a construction range of standard sizes and loads and parking and actuating brakes sized even only for 1/5 of the maximum provided force.
  • This type of electro-hydro-mechanical force increasing actuator has the further advantage of appearing in a construction shape which is not different from the shape of an hydraulic cylinder and to be able to replace it without excessive modifications in existing machine structures .
  • the above-described actuator has two main types of problems: first of all, it is equipped with an actuating spring, which does not provide a constant reaction pressure, but rather a pressure accumulation and therefore does not perform a constant force stroke, and tends to lose its own functionality in time: moreover, its replacement in case of need compels to disassemble the whole actuator, with obvious problems of times and costs.
  • actuating spring which does not provide a constant reaction pressure, but rather a pressure accumulation and therefore does not perform a constant force stroke, and tends to lose its own functionality in time: moreover, its replacement in case of need compels to disassemble the whole actuator, with obvious problems of times and costs.
  • such actuator allows realising multiplying ratios which are not greater than five, which are of a rather limited application in the field of existing machines.
  • Object of the present invention is solving the above prior art problems, by providing a force-multiplying hydraulic actuator which does not need actuating solenoid valves, thereby avoiding replacement problems of such components and response delays during operation.
  • a further object of the present invention is providing an actuator of the above described type which is compact and with a reduced encumbrance, providing an oil chamber actuated by compressed air, which is placed adjacent and parallel to the actuator body.
  • a further object of the present invention is providing an actuator of the above described type which is further equipped with a lubricating chamber of the actuating nut, which allows a better operation and a more efficient maintainability of this part of the actuator.
  • FIG. 1 shows a side sectional view of the currently preferred embodiment of the force-multiplying actuator of the present invention in its closing step, with the open valve position detailed in Figure IA;
  • Figure 2 is a view similar to Figure 1, with the actuator approaching the pressing operation, with its open valve as detailed in Figure 2A;
  • Figure 3 is a view similar to Figure 1, with the actuator in its pressing step and its valve open, as detailed in Figure 3A.
  • the force-multiplying hydraulic actuator 1 of the present invention substantially comprises: an elongated support body 3;
  • valve means 22 placed in the moving liner 46 and communicating with the duct 20 and adapted to be driven for opening and closing by the stem 14 respectively when the stem 14 goes back and advances along the actuator 1 axis.
  • Such valve means 22 are adapted to assume their opening position when the stem 14 goes back to allow oil pushed by the entering/sucking means 18 to penetrate into the chamber 16, and their closing position when the stem 14 advances for preventing oil from penetrating inside the chamber 16 and for actuating the actuator 1 in a thrust with a force multiplied by the area difference existing between the chamber 16 and outside.
  • valve means 22 are driven to be opened by an elongated push rod 26 operatively connected to the stem 14 through a connection plate 28, and the valve means 22 are drived to be closed by spring means 30 operatively connected thereto.
  • the inventive actuator 1 comprises an elongated chamber 32 arranged adjacent and with its own axis parallel to the actuator 1 axis, in which such chamber 32 contains oil and is connected to the duct 20, and is closed from its opposite part to the one connected to the duct 20 by a pushing pad 34.
  • the pushing pad 34 is actuated in its pushing action by compressed air contained in a chamber 36 placed upstream of the pad 34 and compressed by air compressing means (not shown) for facilitating the oil flow.
  • the actuator 1 comprises a lubricating chamber 38 in which the pushing/pulling means 11, 13 are contained for their lubrication: the lubricating chamber 38 is connected to a tank 40 for the lubricating oil made integral with the body 3 of the actuator 1.
  • the pushing/pulling means 11, 13 are composed of a recirculation screw 11 with balls, rollers or planetary rollers and a nut 13.
  • the inventive actuator 1 further comprises at least one upright 43 adapted to prevent the stem 14 from rotating.
  • the actuator 1 is further equipped with a fixed liner 44 and a moving liner 46, in which the moving liner 46 is operatively connected to the connection plate 28 and the rotation-preventing upright 43.
  • the actuator 1 of the invention provides for an advancement step, driven by the reducer 9 which pushes the pushing/pulling means 11, 13 and with them the stem 14 and consequently the second anchoring plate 7 towards the position in which its force has to be exerted.
  • the second anchoring plate 7 abuts onto such position, it does not advance any more and the further advancement of the stem 14 makes the push rod 26 detach from the check valve 22 which then, being pushed by the spring 30, closes and blocks the oil inflow which reached the chamber 16, preventing oil from being loaded in the chamber 16 itself. In this way, due to the difference between oil volume contained in the chamber 16 and outside, a multiplied thrust is exerted which the actuator 1 must provide.
  • the stem 14 is withdrawn through the pushing/pulling means 11, 13: such withdrawal takes again the push rod 26 in contact with the check valve 22, pushing it to open the duct 20 and allowing oil coming from the chamber 32 and pushed by the pad 34 through the upstream compressed air to be again pushed into the chamber 16, and the cycle starts again till a new actuation of the inventive actuator 1 is performed.
  • the actuator 1 of the invention finds its most efficient application in the field of pressing, and in particular in the field of forming and cutting materials, without having to use screws and toggles and allowing to perform both workings in a single operation.

Landscapes

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

Abstract

Actionneur hydraulique (1) multiplicateur d'effort, comportant : un réducteur (9) entraînant des moyens (11, 13) de poussée / de traction ; une tige (14) poussée et tirée par les moyens (11, 13) de poussée / de traction et contenue à l'intérieur d'une chambre (16) remplie d'huile ; un moyen (18) d'injection / d'aspiration d'huile à l'intérieur / à l'extérieur de la chambre (16) à travers un conduit (20) ; un moyen (22) de clapet anti-retour communiquant avec le conduit (20) et prévu pour être actionné dans le sens de l'ouverture / de la fermeture par la tige (14) lorsque la tige (14) recule / avance : le moyen (22) de clapet anti-retour prenant sa position d'ouverture pour permettre à l'huile de pénétrer dans la chambre (16) et sa position de fermeture pour empêcher l'huile de pénétrer dans la chambre (16) et pour actionner l'actionneur (1) en fournissant une poussée dont l'intensité est multipliée par la différence d'aire existant entre la chambre (16) et l'extérieur.
PCT/IT2006/000245 2006-04-12 2006-04-12 Actionneur hydraulique multiplicateur d'effort WO2007116421A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000245 WO2007116421A1 (fr) 2006-04-12 2006-04-12 Actionneur hydraulique multiplicateur d'effort

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000245 WO2007116421A1 (fr) 2006-04-12 2006-04-12 Actionneur hydraulique multiplicateur d'effort

Publications (1)

Publication Number Publication Date
WO2007116421A1 true WO2007116421A1 (fr) 2007-10-18

Family

ID=37395803

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2006/000245 WO2007116421A1 (fr) 2006-04-12 2006-04-12 Actionneur hydraulique multiplicateur d'effort

Country Status (1)

Country Link
WO (1) WO2007116421A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20090161A1 (it) * 2009-06-17 2010-12-18 Rozzi De Hieronymis Carlo Maria Intensificatore di forza idraulica a riarmo
CN103148047A (zh) * 2013-03-21 2013-06-12 肖志权 一种内反馈数字伺服液压缸

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1284609A (fr) * 1961-01-03 1962-02-16 Vérin hydraulique haute pression avec multiplicateur incorporé
US4499728A (en) * 1980-03-12 1985-02-19 Therond Marcel P Hydraulic press mechanism
US5345766A (en) * 1991-01-14 1994-09-13 Engel Maschinenbau Gesellschaft M.B.H. Arrangement for carrying out a two-stage linear movement
EP1273805A2 (fr) * 2001-07-05 2003-01-08 O.M.G. S.R.L. Multiplicateur de pression hydraulique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1284609A (fr) * 1961-01-03 1962-02-16 Vérin hydraulique haute pression avec multiplicateur incorporé
US4499728A (en) * 1980-03-12 1985-02-19 Therond Marcel P Hydraulic press mechanism
US5345766A (en) * 1991-01-14 1994-09-13 Engel Maschinenbau Gesellschaft M.B.H. Arrangement for carrying out a two-stage linear movement
EP1273805A2 (fr) * 2001-07-05 2003-01-08 O.M.G. S.R.L. Multiplicateur de pression hydraulique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20090161A1 (it) * 2009-06-17 2010-12-18 Rozzi De Hieronymis Carlo Maria Intensificatore di forza idraulica a riarmo
CN103148047A (zh) * 2013-03-21 2013-06-12 肖志权 一种内反馈数字伺服液压缸

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