EP1972797A1 - Hydropneumatischer zylinder - Google Patents

Hydropneumatischer zylinder Download PDF

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Publication number
EP1972797A1
EP1972797A1 EP06841749A EP06841749A EP1972797A1 EP 1972797 A1 EP1972797 A1 EP 1972797A1 EP 06841749 A EP06841749 A EP 06841749A EP 06841749 A EP06841749 A EP 06841749A EP 1972797 A1 EP1972797 A1 EP 1972797A1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
hydraulic
rod
pneumatic
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.)
Withdrawn
Application number
EP06841749A
Other languages
English (en)
French (fr)
Inventor
Juan Manuel Herrero Garmendia
Javier Mª LIZASO ESNAOLA
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.)
Jm Herliz Sl
Original Assignee
Jm Herliz Sl
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 Jm Herliz Sl filed Critical Jm Herliz Sl
Publication of EP1972797A1 publication Critical patent/EP1972797A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F15B11/0725—Combined pneumatic-hydraulic systems with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators

Definitions

  • the present invention relates to cylinders which use a combined hydraulic and pneumatic actuation for carrying out application work, such as perforation of parts, and proposes a cylinder of this type which itself carries out the change between pneumatic and hydraulic actuations, without having to resort to accessory control elements.
  • Said cylinders with a combined hydropneumatic action perform the work in successive phases, so that, by For example, the first phase involves approaching the tool from the work position; the second phase is aimed at carrying out the work action of the operation to be performed; lastly, during the third phase, the removal of the tool and the return to the initial position take place; the first and third phases require a strictly pneumatic actuation, whereas during the second phase, the pneumatic actuation associated with the hydraulic actuation produces a multiplier effect.
  • detectors which control the position of the working tool at each of the limit points of the different phases, generating pulses or signals causing the passage of one type of actuation to another.
  • This device requires a regulation and control system to ensure synchronization between the different phases of work, a more complex and expensive installation that the solution proposed by the present invention is necessary, in addition to the maintenance required by these conventional facilities.
  • This invention is based on a hydropneumatic cylinder having constructive and functional characteristics allowing its operation without the need for accessory elements controlling the passage of one type of actuation to another between the different phases of work, and thus offering qualities of particularly interesting installation and operation.
  • the cylinder forming the subject of the invention consists of a set of successive chambers inside a structural body, with air injection in one of these chambers, while the other chamber is filled with a hydraulic fluid, such as oil.
  • a piston is housed in the air chamber, from which emerges a rod which joins the oil chamber, where it is connected to another piston also provided with a rod which protrudes outwardly at the end of this piston. chamber, and serves as a working tool directly or through an accessory.
  • the injection of compressed air into the upper part of the air chamber has the effect of the forward movement of the piston of this chamber, so that the rod of this piston is gradually introduced into the chamber.
  • oil which causes an increase in pressure; the piston of this oil chamber then undergoes a thrust which causes it to move in turn forward, so that, when this progression occurs, the hydraulic fluid passes from a portion of said oil chamber to the other, through the piston of it.
  • the lower end of the oil chamber is connected to the volumetric tank, which is equipped with a device acting temporarily or elastic to prevent the passage of hydraulic fluid to the tank.
  • This device is provided with a piston on one side of which is applied a force, which may be pneumatic, by means of a spring for example, while the other part is in contact with the lower part of the chamber through the leads.
  • the hydraulic fluid thrust section would be small, equivalent to the section of the device and the force applied to the other part would immobilize the piston.
  • the rod abuts on the part on which the operation to be carried out occurs an increase in the pressure in the chamber; the latter being connected to the reservoir through the conduit, it transmits this pressure to the piston and thus succeeds in overcoming the force exerted on the other part thereof and causes the displacement of said piston.
  • the thrust section of the oil increases and thus increases the force of the hydraulic fluid on the piston with less pressure. This displacement causes a pressure drop of the hydraulic fluid in the lower part of the chamber and the volumetric tank.
  • the cylinder which is the subject of the invention has undeniably interesting characteristics and a considerable potential with respect to the function for which it is intended.
  • the object of the invention relates to an operational cylinder with combined pneumatic and hydraulic operation, having characteristics enabling its operation under particularly advantageous conditions.
  • the recommended cylinder consists of a set (1) formed of two successive chambers (2 and 4), one (2) pneumatic action and the other (4) hydraulic action, in which are housed two pistons (5 and 6).
  • the pneumatic chamber (2) has at its ends two orifices (2.1 and 2.2) for the injection of compressed air by means of a supply source (8), whereas the chamber (4) is filled with a hydraulic fluid, such as oil, a complementary chamber (3) connected to the hydraulic chamber (4) through a passage (9) which can occupy an intermediate position.
  • a hydraulic fluid such as oil
  • the piston (5) of the chamber (2) has a rod (5.1) which passes through the intermediate chamber (3) and enters the oil chamber (4) located in the extension at the passage (9), where it fits in the piston (6) housed in this chamber (4).
  • the rod (5.1) blocks the passage (9) and cancels the connection between the chambers (3 and 4); however, this rod (5.1) has a notch (10), which allows the chambers (3 and 4) to communicate when it is at the passage (9).
  • the notch (10) of the rod (5.1) coincides with the passage (9), which determines a connection between the chambers (3 and 4), so that the air that could be in the chamber ( 4) is expelled to the chamber (3), from which it exits to the outside through the bleed holes (11) existing in the upper part thereof.
  • the piston (6) of the chamber (4) has in turn a rod (6.1) which protrudes outwardly at the end of the chamber (4) mentioned above, thus serving, directly or via an accessory, tool for the work operations that the cylinder must perform;
  • this piston (6) has a compartment (12) in which the end of the rod (5.1) of the piston (5) is capable of fitting and determining a duct connecting the two parts of the chamber (4) separated by said piston (6), which allows the passage of hydraulic fluid between these two parts, so that the conduit is blocked when the end of the rod (5.1) is inserted into the compartment (12).
  • the hydraulic chamber (4) is connected by a conduit (13) to a positive displacement tank (7), which is provided with a device acting temporarily or elastically against the entry of the hydraulic fluid from the chamber (4).
  • the temporary hydraulic fluid inlet restraining device in the volumetric reservoir (7) may be, for example, a valve (14) pushed by a spring (15), without this embodiment being restrictive, being given that any mechanical, pneumatic, electrical, etc. device, temporarily avoiding the arrival of hydraulic fluid in the tank (7), up to a certain pressure, can be used for this purpose.
  • the piston (14) rests on the internal bottom of the volumetric reservoir (7); the hydraulic fluid therefore acts only at the mouth of the conduit (13), but as soon as the piston (14) begins to move, the hydraulic fluid thrust section on the piston (14) increases and requires a lower pressure hydraulic fluid to overcome the resistance offered by the piston (14), thereby causing a pressure drop of the hydraulic fluid in the lower part of the chamber (4) and the volumetric reservoir (7).
  • the moment at which the opening of the duct allowing the passage of the fluid to the volumetric reservoir (7) will be regulated can be regulated by increasing or reducing the force exerted on the piston (14) from outside the volumetric reservoir (7). which has the effect of reducing or increasing the pressure of the hydraulic fluid necessary to overcome this force.
  • the force stroke length can be regulated by limiting the volume of hydraulic fluid entering the displacement tank (7) or by limiting the travel of the piston (14).

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP06841749A 2006-01-02 2006-12-19 Hydropneumatischer zylinder Withdrawn EP1972797A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200600004A ES2285927B2 (es) 2006-01-02 2006-01-02 Cilindro hidroneumatico.
PCT/ES2006/000697 WO2007077275A1 (es) 2006-01-02 2006-12-19 Cilindro hidroneumático

Publications (1)

Publication Number Publication Date
EP1972797A1 true EP1972797A1 (de) 2008-09-24

Family

ID=38227936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06841749A Withdrawn EP1972797A1 (de) 2006-01-02 2006-12-19 Hydropneumatischer zylinder

Country Status (3)

Country Link
EP (1) EP1972797A1 (de)
ES (1) ES2285927B2 (de)
WO (1) WO2007077275A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011103604U1 (de) * 2011-07-22 2012-07-24 Otto Schell Linearantriebssystem mit einem Doppelmediumarbeitszylinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2258593A1 (de) * 1972-11-30 1974-06-12 Erhard Stueber Druckgasbetaetigter zylinder mit hydraulischer kraftverstaerkung
CH568813A5 (de) * 1973-09-17 1975-11-14 Infranor Sa
JPS5718802A (en) * 1980-07-10 1982-01-30 Oiles Ind Co Ltd Pneumatic and hydraulic pressurizing cylinder device
DE29720786U1 (de) * 1997-11-24 1999-03-25 Farger & Joosten Maschinenbau Hydropneumatischer Druckübersetzer
DE102004010438B3 (de) * 2004-03-01 2005-06-30 Farger & Joosten Maschinenbau Gmbh Hydropneumatischer Druckübersetzer mit Axial- und Radialdichtungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007077275A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011103604U1 (de) * 2011-07-22 2012-07-24 Otto Schell Linearantriebssystem mit einem Doppelmediumarbeitszylinder

Also Published As

Publication number Publication date
ES2285927A1 (es) 2007-11-16
ES2285927B2 (es) 2008-09-01
WO2007077275A1 (es) 2007-07-12

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