EP0687481A1 - Verfahren und Vorrichtung zur Steuerung der Leistungszufuhr eines Ventil für hydraulischen Werkzeuge - Google Patents

Verfahren und Vorrichtung zur Steuerung der Leistungszufuhr eines Ventil für hydraulischen Werkzeuge Download PDF

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Publication number
EP0687481A1
EP0687481A1 EP95430004A EP95430004A EP0687481A1 EP 0687481 A1 EP0687481 A1 EP 0687481A1 EP 95430004 A EP95430004 A EP 95430004A EP 95430004 A EP95430004 A EP 95430004A EP 0687481 A1 EP0687481 A1 EP 0687481A1
Authority
EP
European Patent Office
Prior art keywords
handle
fluid
chamber
hose
piston
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.)
Granted
Application number
EP95430004A
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English (en)
French (fr)
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EP0687481B1 (de
Inventor
Yvan Cardona
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.)
Libervit (sarl)
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Libervit (sarl)
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Publication of EP0687481A1 publication Critical patent/EP0687481A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means
    • 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
    • F15B15/1476—Special return means

Definitions

  • the present invention relates to methods and devices for controlling and supplying cylinders for operating hydraulic tools.
  • the technical sector of the invention is the field of manufacturing hydraulic equipment.
  • One of the main applications of the invention is the production of extrication equipment of the shear or retractor type for accessing and releasing, for example, occupants stranded in a damaged means of transport, such as an automobile, a railway wagon , a coach, etc ..., or victims trapped under loads or in closed structures during accidents in the industrial field or in the building ...
  • extrication equipment of the shear or retractor type for accessing and releasing, for example, occupants stranded in a damaged means of transport, such as an automobile, a railway wagon , a coach, etc ..., or victims trapped under loads or in closed structures during accidents in the industrial field or in the building ...
  • rescue organizations sappers - firefighters, civil protection, the army, etc ...
  • Another application is the production of cutting, pushing or shoring equipment for industrial use of works and intervention, especially in structures or environments where hydraulic energy is well suited such as in confined environments, underwater works, nuclear power plants, etc.
  • the problem posed is therefore to overcome the current drawbacks in both hydro-mechanical and electro-hydraulic control systems, by producing devices and following control and supply methods for actuating jacks for hydraulic tools such as setting use of these tools is simple and easy with a minimum of connecting elements and control and handling parts, while respecting the safety requirements, some of which are standardized, at least in France for maintaining the acquired position of the tool, regardless of the risk of loss of hydraulic power and even in the event of improper handling by the operator, who would either drop his tool or inadvertently strike the controls.
  • the chamber situated on the other side of the piston is filled relative to the chamber receiving said fluid under pressure with compressed gas, which thus maintains a pressing pressure on the corresponding side of the piston.
  • the piston chamber receiving said hydraulic fluid is supplied through a non-return valve mounted on a bypass.
  • the communication conduit with said chamber and arranged in parallel with the bypass comprising said return valve which is kept closed, both in the rest position of the handle and in the pressurized position of the actuator of the tool; in addition, in a preferred embodiment, said supply hose is relieved of any pressure when said handle is in neutral position of rest by opening control, linked to that of said contactor, from a return valve to a tank located at the other end of the hose and associated in a loop parallel to said source of hydraulic fluid.
  • said electrical connection is constituted by at least one conductive wire incorporated in the protective sheath of the hose.
  • the result is new methods and devices for controlling and supplying cylinders for operating hydraulic tools, responding to the problems posed and satisfying the various drawbacks raised in the current devices.
  • the safety standards as defined in France by standard NFS 71572 relating to hydraulic extrication equipment by jack for operating single-acting hydraulic tools can be respected: in fact, the presence of non-return and / or safety valves in the supply part integral with the tool itself, allows in the event of a break in the hydraulic supply hose, to ensure the immediate stop of the tool in its position acquired at the time of this rupture; moreover, in another type of use such as for a thrust cylinder, used for example as a prop stay, it can do its work stopped at a chosen point, then disconnected from its supply hose, the automatic locking of the handle blocking the valves in a non-return position, prohibits any thoughtless operation: such a forestay can then be left in place in extension and under load if other equipment requires the connection of the supply hose.
  • the fact of incorporating directly into a part of the tool handling handle the command to open and close the hydraulic supply and return valves of the tool and to allow this command by rotation d 'a part of the handle avoids any false maneuver by hooking or untimely pressing on a lever or a solenoid valve control button, as in current devices.
  • the return to the neutral position of said handle which can be effected by a return spring system, with a positive locking in this position, provides so-called dead man's safety if the operator suddenly releases the handle: the whole tool will remain in the acquired position, since the handle will automatically return to this neutral position, maintain itself there and prevent any circulation of the fluid and therefore any movement.
  • the device according to the invention also simplifies the production, assembly and presentation of the tool itself which then has only one appendage by its handling handle of any necessary, and it is connected to a single flexible incorporating even the electrical connection, which also requires only a single connection and therefore a single handling of commissioning.
  • Figure 1 is an overall diagram of the device and method according to the invention.
  • FIGS. 2, 3 and 4 represent the part of the control and supply device proper of the hydraulic cylinders by their operating handle in the active pressurizing position C according to FIG. 2, in the neutral position N stopping according to the Figure 3, and in the return position C to the initial state in Figure 4.
  • FIG. 5 is a detailed sectional view of an embodiment of a control handle according to the invention.
  • the device as described in the attached figures, for controlling and supplying at least one actuating cylinder 2 for a hydraulic tool comprises, in a known manner, a handle 3 for handling said tool, a hose 4 connecting the latter to a source 5 of hydraulic fluid which can thus be pressurized, a connection electric 6 between the latter and at least one contactor 7 for starting up and integral with said handling handle 3.
  • Said actuating cylinder 2 comprises a chamber 8 receiving said pressurized fluid and located on one side of the movable piston displacing the rod 11 of said cylinder 2, and a chamber 9 located on the other side of the piston 10 and in which is enclosed any elastic compressible means which can oppose the displacement of the piston 10 under the effect of the pressure of the fluid in the other chamber 8, which is preferably achieved by the presence of compressed gas such as air in said chamber 9.
  • At least part 39 of said handling handle 3 is mounted movable on either side of a rest position where it is returned by any elastic means 35 and comprises in its internal volume said contactor 7 which is, moreover, the only one necessary in the present embodiment and which is closed in one of the active positions C of the handle 3 according to FIG. 2, a communication conduit 14 between said hose 4 connected to said handle 3 and the chamber 8 of the jack 2, and at least one valve 12 preventing the return of the fluid when the handle 3 is in said active position C for supplying the pressurized fluid, and authorizing the return of the fluid in another active position B, according to FIG.
  • the fluid which filled the chamber 8 is thus expelled into said hose 4 by the pressure pressure effect of the elastic device, such as compressed air r filling the interior of the chamber 9.
  • Said fluid then returns to a return tank 19 of the source of pressurized fluid 5 by virtue of the open position of a solenoid valve 18 disposed at the other end of the hose and opening direct communication parallel to that of the fluid source 5 between said hose 4 and said cover 19, when said movable part 39 of said handle 3 is in return position B or even from the neutral N position of this movable part, so as not to keep the hose under pressure.
  • Said movable part 39 of said handle 3 is preferably of cylindrical shape and rotatably mounted, to ensure easier manual gripping; and to allow connection and simple handling thereof, said hose 4 is preferably connected in the axis AA 'of said cylindrical movable part 39 of this handle 3, as shown in FIG. 5.
  • the command to start the hydroelectric group 5, as well as the arrival of the pressurized fluid through the hose 4 in said conduit 14, and therefore the progression of the push cylinder or jacks 11, can be ensured by the rotation C of 90 ° for example of said movable part 39 in the counterclockwise direction, while, according to FIG. 4, a manual rotation B of 90 ° for example in the clockwise direction will then command the return of the working fluid from the thrust cylinder to the cover 19 of the hydroelectric group 5 through this same single connection hose 4.
  • the electrical connection 6 requiring two conductors, one may consist of the conventional braid of steel resistant to the pressure of the hose itself, and the other of a second conductive braid, such as copper insulated from the first and from the outside.
  • Said hydraulic pump 15 then sends the fluid under pressure in said hose 4 to the handle 3, then through the communication conduit 14 and the bypass 141, into the chamber 8 of said cylinder 2 allowing the displacement of the piston 10 and its rod 11; if the force is too great in relation to the pressure or if the jack has reached the end of the stroke, and if the opening of said duct 141 is maintained, the hydraulic pump 15 will reject the excess fluid, thanks to a limiter pressure 20, in said cover 19.
  • the contactor 7 In the rest position N of said movable part 39 of the handle 3 according to FIG. 3, the contactor 7 being open stops the operation of said pump 15 by stopping its drive motor 16 and opens by default supply, which constitutes additional safety, the solenoid valve 18 to said tank 19, a non-return valve 20 on the supply outlet of the pump 15, prevents the return of fluid therein.
  • Another check valve 22 can also be arranged on the return branch upstream of the solenoid valve 18 to maintain at least atmospheric pressure throughout the hose 4, preventing the latter from being emptied by gravity and allowing refitting. faster pressure.
  • the pressure in the chamber 8 is then maintained, on the one hand by the presence of the non-return valve 13 on the part of the supply duct 141 of the handle and, on the other hand by the closing of the valve 12 on the return duct 142.
  • the movable part 39 of the handle 3 is then moved in the direction B according to FIG. 4, when the valve 12 opens, the fluid contained in the chamber 8, driven out by the pressure effect of the compressed air for example located in the chamber 9, returns to the sheet 19 according to the method described above.
  • Figure 5 gives in section a particular embodiment of the control handle in the neutral rest position, and therefore with the initial position of the parts which compose it: a closing-opening screw 24 is screwed in the maximum position in the block 22 distribution of the cylinder heads 2 of tools, blocking by its point a ball valve 12 of the tool return against the orifice of the return communication conduit 142 which it thus condemns; a spring 35 with double action, rotating right and left, brings the movable part 39 of the handle 3 and all its internal mechanism to the neutral position of rest by rotation, around the main axis AA 'and of an internal axial support 26 secured to the base 27 of the handle 3; this base is itself fixed on the distribution block 22 and said main axial support 26 is pierced by the communication conduit 14 between the flexible 4 and said distribution block 22.
  • the second case is that of the connection of the fluid-carrying hose 4: after connection of this hose, following the opposite maneuver as above, the ring 28, female and integral with the handle 3, of the quick coupling is locked on the male end of the hose 4, advancing by distance e. It drives with it the sleeve 36 which releases the stud 40 from its housing 43. At this time, a manual rotation of the sleeve 36 will rotate the stud 40 on the edge of the handle 39, thus preventing untimely disconnection of the flexible 4 by impossibility of rear translation of the sleeve 36, even in the neutral position of the handle.
  • this locking movement of the sleeve 36 of the handle 3 brings a brush-spring combination 37 into contact with a collecting ring 41 of the hose 4 and which brings the electric current through the connection wire 6 for the operating order of the hydraulic power unit 5.
  • This combined spring brush assembly 37 is shown in dotted lines in FIG. 5, because it can be in any plane intersecting that of the figure, due to the free rotation of the sleeve 36, when it is not blocked by its stud 40 in the neutral and disconnection position.
  • the sleeve 36 stops its pushing on the locking finger 33 which, under the action of its spring 34, is withdrawn from its housing 44 in the base 27, thus allowing the rotation of the mobile part. 39 on the control handle.
  • the pressurized fluid such as at 250 bars for example, will thus be supplied as long as said electrical contact is maintained by this rotation action of the handle 39: the fluid is then sent to the chamber or chambers 8 of the thrust cylinders 2 through non-return valves 13 mounted on the communications 141 of the distribution block 22, orifices 46 at the end formed in the screw closing opening 24 of the ball valve 12 from a central channel communicating with the conduit 14 for communication of the central handle support 26 and said quick coupling 28, as described and defined above d in FIGS. 1 to 4.
  • the axial displacement of the closing-opening screw 24 relative to the axial handle support 14 is permitted and compensated by a sealed connection sleeve 29 provided with seals such as O-rings towards its ends, cooperating on one side with a corresponding housing in the closing-opening screw head 24, on the other side with another corresponding housing in said axial body 26 supporting the handle 3.
  • the ball valve 12 being open, the system returning to the initial position of the jack or jacks, by compressed air, for example located in their chamber 9, drives the hydraulic fluid from the chambers 8 towards the tank 19 of the pressure group. 5 via the channel 142 of the distribution block 22, the ball valve 12 and the central channels of the screw 24, of the sleeve 29, of the handle support pin 26 and of the female part of the quick coupling 28.
  • the return speed of the push cylinder (s) can be modulated in relation to the more or less accentuated rotation of the movable part of the handle 39, whose manual graduation of the angle of rotation between 0 and 90 ° for example, can allow control of the opening of the return channel 142 by the ball valve 12 and thus a millimeter displacement of the return of the push cylinders increasing the precision of the work to be performed.
  • Various guiding devices 42 in rotation of the elements relative to each other such as in particular the sleeve 30 of insulating material, support of the drive rod 31 relative to the central support axis 26 and also having to ensure the electrical continuity between this rod 31 and this support 26, complete the embodiment of the device according to the invention, as shown in FIG. 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Mechanically-Actuated Valves (AREA)
EP95430004A 1994-06-15 1995-06-08 Verfahren und Vorrichtung zur Steuerung der Speisung eines Stellgliedes für ein hydraulisches Werkzeug Expired - Lifetime EP0687481B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9407680 1994-06-15
FR9407680A FR2721359B1 (fr) 1994-06-15 1994-06-15 Procédé et dispositif de commande et d'alimentation de vérin de manÓoeuvre d'outils hydrauliques.

Publications (2)

Publication Number Publication Date
EP0687481A1 true EP0687481A1 (de) 1995-12-20
EP0687481B1 EP0687481B1 (de) 2000-03-22

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ID=9464535

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Application Number Title Priority Date Filing Date
EP95430004A Expired - Lifetime EP0687481B1 (de) 1994-06-15 1995-06-08 Verfahren und Vorrichtung zur Steuerung der Speisung eines Stellgliedes für ein hydraulisches Werkzeug

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Country Link
EP (1) EP0687481B1 (de)
DE (1) DE69515727T2 (de)
ES (1) ES2144594T3 (de)
FR (1) FR2721359B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006016162A1 (en) * 2004-08-13 2006-02-16 Tentec Limited A bolt tensioner
EP3134223A4 (de) * 2014-04-23 2017-12-20 Ridge Tool Company Hydraulisches presswerkzeug
CN111322035A (zh) * 2020-04-02 2020-06-23 山东天汇石油技术有限公司 可快速安全逃生的油井带压作业装置及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2785338B1 (fr) 1998-10-28 2001-08-10 Aro Verin a dispositif elastique de rappel d'un ensemble de piston de travail en position neutre
FR2825354B1 (fr) 2001-06-01 2003-09-05 Libervit Dispositif pour exercer une poussee sur une porte ou toute autre surface plane verticale

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319276A1 (de) 1972-04-26 1973-11-15 Hurst Performance Rettungswerkzeug
US4392263A (en) 1981-02-02 1983-07-12 Amoroso Michael J Portable rescue tool
EP0156939A1 (de) 1982-10-26 1985-10-09 Mora Hydraulics AB Druckmittelgesteuertes Werkzeug
FR2630944A1 (fr) 1988-05-04 1989-11-10 Edme Marcel Appareil pour degager les occupants d'un vehicule accidente
WO1993018893A1 (en) * 1992-03-18 1993-09-30 Hale Fire Pump Company Portable rescue tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319276A1 (de) 1972-04-26 1973-11-15 Hurst Performance Rettungswerkzeug
US4392263A (en) 1981-02-02 1983-07-12 Amoroso Michael J Portable rescue tool
EP0156939A1 (de) 1982-10-26 1985-10-09 Mora Hydraulics AB Druckmittelgesteuertes Werkzeug
FR2630944A1 (fr) 1988-05-04 1989-11-10 Edme Marcel Appareil pour degager les occupants d'un vehicule accidente
WO1993018893A1 (en) * 1992-03-18 1993-09-30 Hale Fire Pump Company Portable rescue tool

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006016162A1 (en) * 2004-08-13 2006-02-16 Tentec Limited A bolt tensioner
EP3134223A4 (de) * 2014-04-23 2017-12-20 Ridge Tool Company Hydraulisches presswerkzeug
US10010066B2 (en) 2014-04-23 2018-07-03 Ridge Tool Company Hydraulic press tool
CN111322035A (zh) * 2020-04-02 2020-06-23 山东天汇石油技术有限公司 可快速安全逃生的油井带压作业装置及方法
CN111322035B (zh) * 2020-04-02 2021-12-07 江苏瑞亿石油机械有限公司 可快速安全逃生的油井带压作业装置及方法

Also Published As

Publication number Publication date
FR2721359B1 (fr) 1996-09-13
FR2721359A1 (fr) 1995-12-22
DE69515727D1 (de) 2000-04-27
ES2144594T3 (es) 2000-06-16
EP0687481B1 (de) 2000-03-22
DE69515727T2 (de) 2000-09-07

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