EP1155812B1 - Cylinder and total rod stoppage system - Google Patents

Cylinder and total rod stoppage system Download PDF

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Publication number
EP1155812B1
EP1155812B1 EP99974057A EP99974057A EP1155812B1 EP 1155812 B1 EP1155812 B1 EP 1155812B1 EP 99974057 A EP99974057 A EP 99974057A EP 99974057 A EP99974057 A EP 99974057A EP 1155812 B1 EP1155812 B1 EP 1155812B1
Authority
EP
European Patent Office
Prior art keywords
chamber
rod
cylinder
chambers
bushing
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.)
Expired - Lifetime
Application number
EP99974057A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1155812A1 (en
Inventor
Isaac Orive Cantera
Nuria Orive Cantera
Mercedes Orive Cantera
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.)
Nitrogas SL
Original Assignee
Nitrogas S L
Nitrogas 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 Nitrogas S L, Nitrogas SL filed Critical Nitrogas S L
Publication of EP1155812A1 publication Critical patent/EP1155812A1/en
Application granted granted Critical
Publication of EP1155812B1 publication Critical patent/EP1155812B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses

Definitions

  • the invention relates to a cylinder associated to a system by which the corresponding cylinder rod is locked in its end position of its stroke, also allowing to control and adjust the return of said rod to its initial position.
  • the invention is mainly applicable to cylinders as those used for example in punching installations or tools, without prejudice of its use in any other practical cases requiring these characteristics.
  • the cylinder disclosed presents a number of specific characteristics which in combination with a system comprising a pressure accumulator and an electrovalve solves the above described problem in a simple, effective and reliable manner, as the assembly of cylinder, accumulator and electrovalve conform an elastic force system which allows to control the return of the cylinder rod at will.
  • the cylinder of the invention comprises two hermetic and independent chambers, one which is arranged axially to the corresponding rod, which runs inside a bushing concentric to the outer cylindrical body of the cylinder, so that between said outer wall and said bushing inside which the rod moves axially, the second chamber is defined which may be in communication with the rod but not with the axial chamber in which it moves.
  • the two chambers which contain the hydraulic oil, are externally communicated by a pressure accumulator formed by a cylindrical body with two chambers, one charged with nitrogen through an external charging valve to a given pressure and the other meant to transfer the pressure through a piston interposed between this second chamber and the nitrogen-filled chamber of the accumulator being described, in order to balance pressures in the gas cylinder chamber and in the second chamber of the accumulator.
  • An electrovalve is installed in the branch which communicates the external chamber of the cylinder to the second chamber of the accumulator.
  • This valve can be opened and closed at will, so that when open to it maintains pressure in the external chamber and locks the inwards axial displacement of the rod by means of an external force, that is, during the active operation of the cylinder.
  • an external force on the rod ceases due to the chamber being closed, because of the electrovalve the rod cannot return to its original position unless this electrovalve is opened, and thus allows hydraulic oil to pass from said chamber to the second chamber of the accumulator, and naturally towards the axial chamber of the cylinder itself, allowing the rod to recover its original position.
  • the accumulator in addition to transmitting pressure when charged with nitrogen to the cylinder chambers until the pressure balance of the system is restored, also absorbs through the pressurised gas chamber the excess pressure produced by the volume reduction of the cylinder chambers.
  • the electrovalve installed in the branch which communicates the external cylinder chamber to the corresponding accumulator chamber is meant to control at will the flow of oil between the two chambers of the cylinder when said electrovalve is actuated with an external electrical signal.
  • the cylinder which is preferably employed in punching installations or devices comprises an external cylinder (1) which on one of its ends incorporates a flange by which it is attached to a base (2), with two passages (3) and(4).
  • a bushing (5) on which moves axially the corresponding cylinder rod (6), all such that in said general cylinder are defined two chambers (7) and (8), the first (7) axial to rod (6) and therefore inside bushing (5), and the second (8) placed annularly between bushing (5) and the external wall of cylindrical body (1), with this second chamber (8) having a lateral orifice (9) in bushing (5) for communicating said chamber (8) and rod (6).
  • Passage (4) leads to the second chamber (8) and passage (3) leads to the first chamber (7).
  • the cylinder is further provided with a bushing (10) placed in correspondence with the end of bushing (5), so that said bushing (10) acts as a mechanical stop ending the stroke of rod (6).
  • the cylinder and total rod stoppage system is further provided with a pressure accumulator comprising a cylindrical body (11) with a piston (12) which defines two chambers labelled (13) and (14), in which one is a gas chamber (13) which receives nitrogen gas through a charging valve (15), and the other, the third chamber (14), is filled with hydraulic oil, as are the aforementioned chambers (7) and (8) of the cylinder, since this cylinder communicates with chamber (14) through branches (16) and (17), the first connected by passage (3) to the first chamber (7) and the second connected by passage (4) to the second chamber (8).
  • a pressure accumulator comprising a cylindrical body (11) with a piston (12) which defines two chambers labelled (13) and (14), in which one is a gas chamber (13) which receives nitrogen gas through a charging valve (15), and the other, the third chamber (14), is filled with hydraulic oil, as are the aforementioned chambers (7) and (8) of the cylinder, since this cylinder communicates with chamber (14) through branches (16) and (17),
  • chambers (7) and (8) of the cylinder are independent, although they are communicated externally by branches (16) and (17) in combination with chamber (14) of the pressure accumulator.
  • This third chamber (14) is naturally independent of and totally sealed from gas chamber (13) of the accumulator.
  • an electrovalve (18) meant to control oil flow between chambers (7) and (8) of the cylinder, using an external electrical signal as described further below.
  • valve (18) is actuated and opened, oil in chamber (8) will return freely through branch (17) to chambers (14) and (7) respectively, allowing a controlled expansion of said rod (6), that is, its movement towards its original position with bushing (10) acting as a stop for the end of the stroke.
  • a second electrovalve can be installed in branch (16) which may be useful in certain applications, particularly to prevent a possible rebounding effect of cylinder rod (6).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Damping Devices (AREA)
  • Circuit Breakers (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP99974057A 1999-09-30 1999-09-30 Cylinder and total rod stoppage system Expired - Lifetime EP1155812B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES1999/000308 WO2001023170A1 (es) 1999-09-30 1999-09-30 Cilindro de gas con sistema de parada total de vastago

Publications (2)

Publication Number Publication Date
EP1155812A1 EP1155812A1 (en) 2001-11-21
EP1155812B1 true EP1155812B1 (en) 2005-04-20

Family

ID=8307335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99974057A Expired - Lifetime EP1155812B1 (en) 1999-09-30 1999-09-30 Cylinder and total rod stoppage system

Country Status (6)

Country Link
EP (1) EP1155812B1 (es)
AT (1) ATE293534T1 (es)
DE (1) DE69924881T2 (es)
ES (1) ES2242455T3 (es)
PT (1) PT1155812E (es)
WO (1) WO2001023170A1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2216673B1 (es) * 2002-03-15 2005-12-16 Nitrogas, S.L. Cilindro de gas con sistema de parada total de vastago, perfeccionado.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2323478A1 (fr) * 1975-09-10 1977-04-08 Jambon Anciens Ateliers H Presse hydraulique pour operation de cisaillage ou de tronconnage
DE2747548C2 (de) * 1977-10-22 1986-04-17 Thyssen Industrie Ag, 4300 Essen Presse mit Regelkreis
IT1130562B (it) * 1980-03-21 1986-06-18 Mario Riboldi Di Renato Carlo Pressa piegatrice,in particolare per lamiere di metallo o di altro materiale plasticamente deformabile

Also Published As

Publication number Publication date
PT1155812E (pt) 2005-09-30
DE69924881D1 (de) 2005-05-25
DE69924881T2 (de) 2006-03-09
ES2242455T3 (es) 2005-11-01
EP1155812A1 (en) 2001-11-21
ATE293534T1 (de) 2005-05-15
WO2001023170A1 (es) 2001-04-05

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