EP1371857A1 - Vérin pneumatique à double effect avec amortisseur hydraulique - Google Patents

Vérin pneumatique à double effect avec amortisseur hydraulique Download PDF

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Publication number
EP1371857A1
EP1371857A1 EP03013186A EP03013186A EP1371857A1 EP 1371857 A1 EP1371857 A1 EP 1371857A1 EP 03013186 A EP03013186 A EP 03013186A EP 03013186 A EP03013186 A EP 03013186A EP 1371857 A1 EP1371857 A1 EP 1371857A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
rod
stem
piston
equipment
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Withdrawn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
EP03013186A
Other languages
German (de)
English (en)
Inventor
Ener Varetto
Lio Piccolo
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.)
VEP Automation Srl
Original Assignee
VEP Automation Srl
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 VEP Automation Srl filed Critical VEP Automation Srl
Publication of EP1371857A1 publication Critical patent/EP1371857A1/fr
Withdrawn legal-status Critical Current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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/227—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having an auxiliary cushioning piston within the main piston or the cylinder end face
    • 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
    • F15B11/076—Combined pneumatic-hydraulic systems with pneumatic drive or displacement and speed control or stopping by hydraulic braking
    • 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
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • F15B2211/41536—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve being connected to multiple ports of an output member
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure

Definitions

  • the present invention refers in general to handling equipments of the so-called swingable lever type.
  • the invention relates to a device for dampening the oscillation of the arm of a handling equipment of the swingable lever type, which equipment comprises a driving double acting cylinder having a chamber in which a main piston is sealingly mounted, which is slidable as a result of the selective delivery of fluid under pressure at opposite zones of the chamber of the cylinder, the main piston being connected to a rod having a driving end which projects from the cylinder and is associated with said arm.
  • anomalous conditions of delivery of fluid under pressure to the chamber of the cylinder can take place, which may involve on the one hand risks to the integrity of the structure of such equipments and of the equipment associated with them, and on the other hand risks to the safety of operators who may be close to the equipments.
  • a first anomalous condition can take place in the case in which, for example after a maintenance operation carried out on the equipment, the feeding and exhaust lines of the fluid under pressure are not correctly connected to the opposite ends of the cylinder, in particular if an end of the cylinder is connected with the feeding of the fluid under pressure while the other end freely communicates with the outer environment.
  • the fluid under pressure is fed only to one of the cylinder ends, the piston moves violently against the cylinder end which is in communication with the outer environment, causing the arm of the equipment to fall down sharply to an end-of-travel position.
  • Another anomalous condition occurs in the case of a pressure drop in the feeding line of the fluid under pressure to the cylinder, in particular if the oscillation axis of the arm of the equipment is not arranged vertically and if the piston has not reached as yet the end-of-stroke position in which the toggle joint associated with the rod makes irreversible its movement in the cylinder. In this case in fact, owing to the lack of pressure and under the weight of the apparatuses associated with the arm, it can fall down violently towards its lower end-of-travel position.
  • brake devices which operate on the basis of the principle to apply a friction force against the outside surface of the rod in the case of a pressure drop.
  • brake devices may be used which include planes inclined with respect to the cylinder axis, to which rollers or balls are associated, which are intended to interfere with the peripheral surface of the rod when a pressure drop below a predetermined threshold occurs.
  • Other braking devices employ a sheet member having a through circular hole in which the rod is inserted, whose diameter is little greater than that of the rod.
  • the sheet member in the operation with the fluid fed under normal pressure, the sheet member is perpendicular to the axis of the rod, whereby the rod can slide axially through it.
  • the sheet member In the case of pressure drop, the sheet member is placed in a configuration inclined with respect to the rod axis, so that an interference take place between the edges of its through hole and the radial surface of the rod, which causes the axial locking of the latter.
  • the devices mentioned above for controlling the movement of the rod, and therefore the oscillation of the arm may turn out to be not very practical or not very reliable in use.
  • their operation can be affected by the dimensions of the mechanical members involved in the operation, so that the wear of one of the members of the device can jeopardize their good operation, as well as the presence of foreign bodies, also if they are very small, in the fluid fed to the cylinder.
  • such devices allow to lock the rod when it is moving along only one of its shifting directions, and require therefore to be doubled when the locking of the motion of the rod in both its shifting directions is desired.
  • the main object of the present invention is therefore to provide a dampening device intended to fit out a handling equipment of the swingable lever type, which is able to prevent that malfunctions may occur in the case in which the anomalous feeding conditions mentioned above take place.
  • the dampening device of the invention is marked by a simple and compact structure allowing to obtain an effective slowing down of the arm towards the end-of-travel positions, in the case in which an anomaly in the feeding of the cylinder takes place, keeping at the same time the hindrance and the weight of the equipment small, and allowing to limit its production costs.
  • 1 indicates as a whole a handling equipment of the swingable lever type, which is operated by means of fluid under pressure, typically air.
  • the equipment 1 comprises a body 3 to which a double acting fluid cylinder 5 is associated for driving a fork lever arm 7 by means of a toggle joint unit of a type known per se and not illustrated in the figures, which is contained inside the body 3 of the equipment 1.
  • the toggle joint unit allows to set in an oscillation motion a pair of coaxial crank pins 11 on which the branches 13 of the fork arm 7 are fitted, as from the reciprocating motion of a driving end 10a of a rod 10 which is slidable with respect to the cylinder 5.
  • an attachment plate 13a is fastened to the branches 13, which is provided with holes and/or openings in order to allow to connect apparatuses (not shown in the figures) to be moved by the equipment 1.
  • the two opposite faces of the piston 15 have each an axial sleeve portion 15a, 15b, whose diameter is slightly wider than that of the rod 10.
  • the chamber 18 is axially defined by a pair of heads 20a and 20b, respectively higher and lower with reference to the figures.
  • Respective feeding and exhaust lines 21a, 21b and 22a, 22b for the fluid under pressure are formed in each of the heads 27a and 27b.
  • the lines 21a and 21b or 22a and 22b are selectively connected, by a switching device of a type known per se, with a source of fluid under pressure, in order to produce alternatively over-pressure conditions on one of the faces of the piston 15, so as to cause the reciprocating motion of the piston 15 inside the chamber 18 between the heads 20a and 20b.
  • Each of the lines 21a, 21b has preferably a pair of branch lines one of which ends in the chamber 18 facing a respective face of piston 15, the other one ending into a seat 25a, 25b for receiving a respective sleeve portion 15a, 15b of the piston 15 when the piston is in an end-of-stroke position.
  • a cylindrical cavity 27 is formed axially, in which an enlarged head 29 of a sliding stem 30 is slidably and sealingly mounted.
  • the head 29 is provided with an outer seal 32 bearing on the sidewall of the cavity 27.
  • the end of the stem 30 opposite to that supporting the head 29 is rigidly connected to a support plate 34 anchored to the bottom of the cylinder 5, for example by means of a plurality of axial screws (not illustrated in the figures).
  • the cavity 27 is filled up with a service fluid, typically oil, and is separated with respect to the outer environment in order to prevent the discharge of such a liquid.
  • a bored plug 36 which is screwed at the end of the rod 10 opposite to its driving end 10a, is arranged on the side of the chamber 18.
  • the plug 36 is crossed centrally by the stem 30, a ring-like seal 37 being interposed between the stem 30 and the plug 36.
  • an auxiliary piston 38 which will be considered in further detail in the following, is inserted in the axial cavity 27.
  • the piston 38 is provided with a ring-like seal 39 similar to the seal 37 of the bored plug 36.
  • the stem 30 is provided with orifice means for the service fluid, which are conveniently arranged at its end provided with the head 29.
  • These orifice means can consist of a longitudinal hole 31 opening at the end of the stem 30 facing the auxiliary piston 38 and is connected with a calibrated transversal hole 31a opening on the side of the enlarged head 29 facing the plug 36.
  • the enlarged head 29 of the stem 30 slides inside of the cylindrical cavity 27 forcing the service fluid to run through the orifice means constituted by the holes 31 and 31a, so as to pass from a side to the other of the head 29.
  • the hole having the smaller cross-section of the orifice means that is the hole 31a in the case illustrated in the figures but which could be otherwise the hole 31, is dimensioned in such a way that, in the normal operation of the equipment 1, the rod does not endure any appreciable slowing down.
  • the auxiliary piston 38 is mounted floating in the cavity 27 and it can be associated with elastic thrust means 40, constituted by a coil spring, biasing it towards the stem 30.
  • elastic thrust means 40 constituted by a coil spring
  • auxiliary piston 38 is associated with guide means of its axial movement in the cavity 27, comprising a pin 42 an end of which is fixed to the auxiliary piston 38, while the opposite end is slidable in a corresponding seat 46 formed in proximity of the driving end 10a of the rod 10.
  • the seat 46 communicates with the outer environment with respect to the cylinder 5, by means of a vent hole 48.
  • adjusting means of the cross-section of the orifice means in which the service fluid passes can be arranged.
  • a spindle (not illustrated in the figures) can be arranged in a coaxial hole inside the stem 30 and associated with the base of the stem 30 in proximity of the plate 34 by means of a threaded connection, which has a conical tip at his end facing the driving end of the rod 10, in order to cooperate with a corresponding seat formed in a position adjacent to the hole 31, for allowing the section of the hole is changed as a result of the control of such a spindle by means of a tool which can be driven from the outside of the cylinder 5.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP03013186A 2002-06-14 2003-06-12 Vérin pneumatique à double effect avec amortisseur hydraulique Withdrawn EP1371857A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20020504 2002-06-14
IT2002TO000504A ITTO20020504A1 (it) 2002-06-14 2002-06-14 Dispositivo di smorzamento dell'oscillazione del bracio di un'attrezzatura di movimentazione del tipo a leva oscillabile

Publications (1)

Publication Number Publication Date
EP1371857A1 true EP1371857A1 (fr) 2003-12-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03013186A Withdrawn EP1371857A1 (fr) 2002-06-14 2003-06-12 Vérin pneumatique à double effect avec amortisseur hydraulique

Country Status (3)

Country Link
US (1) US20040065194A1 (fr)
EP (1) EP1371857A1 (fr)
IT (1) ITTO20020504A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7565859B2 (en) 2006-04-25 2009-07-28 Smc Corporation Of America Power clamp with kinetic energy control
WO2012007020A1 (fr) * 2010-07-14 2012-01-19 Tünkers Maschinenbau Gmbh Dispositif de pivotement pour déplacer en pivotement des masses, à utiliser en particulier dans la construction de carrosseries de l'industrie automobile
EP2721307A4 (fr) * 2011-06-17 2015-07-08 Asa Suspension Ab Dispositif pour amortir un piston à l'intérieur d'un logement de cylindre
EP3152445A4 (fr) * 2014-06-09 2018-02-21 Thordab Industri Innovation AB Vérin hydraulique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004016556A1 (de) * 2004-04-03 2005-10-27 Zf Friedrichshafen Ag Kolben-Zylinder-Aggregat
US9435359B2 (en) * 2012-02-13 2016-09-06 Schlumberger Technology Corporation Adaptive hydraulic cylinder with floating seal interface
CN116175717B (zh) * 2022-11-29 2023-11-14 苏州艾维科斯园林设备有限公司 一种双向快速节能高效液压劈木机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624318A (en) * 1946-06-24 1953-01-06 Rheem Mfg Co Pneumatic servomotor
DE2920423A1 (de) * 1979-05-19 1980-11-27 Stabilus Gmbh Druckluftzylinder mit feststelleinrichtung
US4526088A (en) * 1980-05-07 1985-07-02 Stabilus Gmbh Fluid-operated actuating device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313214A (en) * 1964-06-16 1967-04-11 Sandex Inc Power feed with liquid check

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624318A (en) * 1946-06-24 1953-01-06 Rheem Mfg Co Pneumatic servomotor
DE2920423A1 (de) * 1979-05-19 1980-11-27 Stabilus Gmbh Druckluftzylinder mit feststelleinrichtung
US4526088A (en) * 1980-05-07 1985-07-02 Stabilus Gmbh Fluid-operated actuating device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7565859B2 (en) 2006-04-25 2009-07-28 Smc Corporation Of America Power clamp with kinetic energy control
WO2012007020A1 (fr) * 2010-07-14 2012-01-19 Tünkers Maschinenbau Gmbh Dispositif de pivotement pour déplacer en pivotement des masses, à utiliser en particulier dans la construction de carrosseries de l'industrie automobile
DE112010005731B4 (de) * 2010-07-14 2014-10-30 Tünkers Maschinenbau Gmbh Schwenkvorrichtung zum Schwenkbewegen von Massen, insbesondere zur Verwendung im Karosseriebau der Kfz-Industrie
EP2721307A4 (fr) * 2011-06-17 2015-07-08 Asa Suspension Ab Dispositif pour amortir un piston à l'intérieur d'un logement de cylindre
EP3152445A4 (fr) * 2014-06-09 2018-02-21 Thordab Industri Innovation AB Vérin hydraulique

Also Published As

Publication number Publication date
US20040065194A1 (en) 2004-04-08
ITTO20020504A0 (it) 2002-06-14
ITTO20020504A1 (it) 2003-12-15

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