EP0637564B1 - Dispositif de sécurité avec soupape de sécurité sous pression - Google Patents

Dispositif de sécurité avec soupape de sécurité sous pression Download PDF

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Publication number
EP0637564B1
EP0637564B1 EP19940890096 EP94890096A EP0637564B1 EP 0637564 B1 EP0637564 B1 EP 0637564B1 EP 19940890096 EP19940890096 EP 19940890096 EP 94890096 A EP94890096 A EP 94890096A EP 0637564 B1 EP0637564 B1 EP 0637564B1
Authority
EP
European Patent Office
Prior art keywords
pressure
monitored
safety
safety valve
switching
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
EP19940890096
Other languages
German (de)
English (en)
Other versions
EP0637564A1 (fr
Inventor
Martin Dipl.-Ing. Rauwolf
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.)
Hoerbiger Hydraulik GmbH
Original Assignee
Hoerbiger Hydraulik GmbH
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 Hoerbiger Hydraulik GmbH filed Critical Hoerbiger Hydraulik GmbH
Publication of EP0637564A1 publication Critical patent/EP0637564A1/fr
Application granted granted Critical
Publication of EP0637564B1 publication Critical patent/EP0637564B1/fr
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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment

Definitions

  • the invention relates to a safety device, in particular for Load torque limitation for mobile cranes or the like, with one of the pressure of a safety valve that can be acted upon by the pressure medium circuit to be monitored and at least one pressure-medium-actuatable device connected to it Switch-off device that for the duration of an exceedance critical pressure control devices of the pressure medium circuit in the sense influenced a pressure limitation, the safety valve two from monitoring pressure applied, biased switching elements, which switch in a defined sequence as the pressure increases and of which the first switchover is the previously existing connection between the shut-off device and the pressure medium reservoir and that Thereafter, the previously blocked connection of the to be monitored is switched Pressure to the shutdown device opens.
  • Such devices are known and are used, for example specified load torque limitation for mobile cranes or the like.
  • the task of the safety valve is to create a load torque proportional Pressure, for example immediately the working pressure of the one to be monitored Pressure medium circuit, to monitor and when a critical Pressure to apply pressure to the shutdown elements.
  • These shutdown devices then prevent, for example, by blocking or limiting the Operating lever for entering further load-increasing positioning movements. This means that only load-reducing adjusting movements remain possible a decrease in the monitored pressure, which eventually leads to a certain pressure level leads to the lifting of the load torque limitation, the shut-off elements the operating lever again for all actuating movements release.
  • the safety valve is designed as a slide valve, the slide of which has two control edges acting as switching elements and against the force a biasing arrangement corresponding to the pressure to be monitored in the corresponding Control edges and connections having housing slidable is. If the mostly adjustable via the pretensioning arrangement is exceeded critical pressure, the slide is moved and closes in mentioned First, the previously existing connection between the shutdown device and Pressure medium reservoir. After overcoming the essential for leakage-free Coverage is then the previously blocked connection of the monitoring pressure to the shutdown device opened, which in the manner mentioned further load-increasing control inputs can be prevented.
  • the monitored load pressure which initially connects to the shutdown device closed and after overcoming the overlap the connection between Switch-off device and pressure medium reservoir opened again and the switch-off will be annulled.
  • the resuscitation pressure difference results from this a component from the mechanical coverage and a component from friction hysteresis.
  • the object of the present invention is to overcome the disadvantages mentioned to avoid known device and in particular on structurally simple and a reliable manner to a device of the type mentioned enable the smallest possible without the leakage described Resuscitation pressure differences can be realized.
  • a safety device of the type mentioned in that the two Switching elements designed as separate seat valves, via a common one Spring arrangement are biased and acted upon by the pressure to be monitored.
  • the seat valves enable the arrangement to operate practically without leakage, the mechanical decoupling of the opening and closing points of these two poppet valves immediately offers the possibility of the resuscitation pressure difference as small as possible and in any case without consideration to carry out the leakage prevention.
  • the common spring arrangement enables a very simple construction of the safety valve and thus the entire safety device.
  • the bias is the common spring arrangement adjustable, making it simple and convenient Way even when the critical pressure is adjusted on Safety valve the required defined sequence of switching of the two separate prestressed switching elements is maintained.
  • Fig. 1 the safety valve Safety device according to the prior art in cross section
  • Fig. 2 shows a corresponding section through an embodiment of the present Invention.
  • the safety valve 1 is part of a safety device not shown here for example, to limit the load torque in vehicle cranes or the like.
  • the pressure of one to be monitored Pressure medium circuit connected via a line, not shown.
  • the connection S stands with a pressure medium-actuatable, also not shown Shutdown device in connection, which for the duration of a Exceeding one via a preload spring 3 and an adjusting screw 4 adjustable critical pressure control devices of the pressure medium circuit, such as control levers of a hand control or the like, in the sense a pressure limitation.
  • a pressure medium-actuatable also not shown
  • Shutdown device in connection, which for the duration of a Exceeding one via a preload spring 3 and an adjusting screw 4 adjustable critical pressure control devices of the pressure medium circuit, such as control levers of a hand control or the like, in the sense a pressure limitation.
  • T Connection to a pressure medium reservoir (also not shown) intended.
  • the safety valve 1 here has a common slide 5 two in the form of switching edges on the slide 5 and associated control edges on Housing 2 realized switching elements 6, 7, which with increasing under Pressure via port P and thus against the force of the preload spring 3 in the illustration slide 5 moved to the left in a defined Switch sequence and of which the first switch (6) the previously existing connection between the shutdown device (connection S) and Pressure medium reservoir (connection T) interrupts and the one that switches afterwards (7) the previously blocked connection of the pressure to be monitored (connection P) to the shut-off device (connection S) opens.
  • FIG. 1 are the same or of functionally identical parts in turn with those already shown in FIG. 1 used and commented reference numerals.
  • Switching elements 6, 7 regardless of the resuscitation pressure difference to solve here are the two switching elements 6, 7 as separate seat valves 8, 9 are formed, which are also separate from the parallel monitoring pressure (port P).
  • the two seat valves 8, 9 are biased via the common spring arrangement 3, here the defined sequence of switching the two seat valves 8, 9 see above it is ensured that different sized, effective sealing diameters can be used on the two seat valves 8, 9. This is the case with a concrete one Embodiment of the seat diameter of the sealing cone of the seat valve 8 formed with 5 mm, while the seat diameter of the switching ball of the seat valve 9 as well as the diameter of the transfer piston 10 is designed with 4.9 mm.
  • the bias is here again common spring arrangement 3 can be varied within limits, thus changing the switching points of the two seat valves 8, 9 together and while maintaining their defined sequence for shifting the critical pressure let it move.
  • connection P When increasing the amount to be monitored via connection P Pressure over the by means of the biasing spring or spring assembly 3rd set critical pressure is based on the discussed diameter ratio the closing surfaces of the two seat valves 8, 9 in the Representation lower seat valve 8 first by means of the conical seat the previously existing connection between the connections S (to which or not Shut-off device (s) shown) and (via the annular gap after the sealing seat) T (reservoir) close - after a corresponding little further Pressure increase then becomes the connection previously closed via the seat ball open between the port P and the port S, which the Connection element for pressure limitation is activated. When the pressure drops on Port P happens in reverse.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)

Claims (3)

  1. Dispositif de sécurité, en particulier pour la limitation du moment de la charge dans le cas des grues mobiles ou analogues, avec un robinet à soupape de sécurité (1) qui peut être exposé à la pression d'un circuit de fluide sous pression à surveiller et au moins un organe de mise hors circuit qui peut être manoeuvré par le fluide sous pression avec lequel il est relié et qui, pendant la durée d'un dépassement, par valeur supérieure, d'une pression critique, influence des dispositifs de commande du circuit de fluide sous pression dans le sens d'une limitation de la pression, dans lequel le robinet à soupape de sécurité (1) présente deux organes de commutation (6, 7) qui sont précontraints, sont exposés à la pression à surveiller, commutent selon une succession définie à pression croissante et dont celui qui commute d'abord (6) y interrompt la liaison, précédemment existante, entre l'organe de mise hors circuit et le réservoir de fluide sous pression et celui (7) qui commute ensuite y ouvre la liaison précédemment verrouillée, de la pression, à surveiller avec l'organe de mise hors circuit, caractérisé par le fait que les deux organes de commutation (6, 7) sont conçus sous forme de soupapes distinctes (8, 9), sont précontraints au moyen d'un dispositif à ressort commun (3) et sont exposés à la pression à surveiller.
  2. Dispositif de sécurité selon la revendication 1, caractérisé par le fait que les diamètres efficaces de l'obturation des deux soupapes (8, 9) sont de dimension différente et/ou qu'à une soupape (8, 9) correspond un ressort de précontrainte supplémentaire.
  3. Dispositif de sécurité selon la revendication 2, caractérisé par le fait que la précontrainte du dispositif élastique commun (3) est réglable.
EP19940890096 1993-08-02 1994-06-08 Dispositif de sécurité avec soupape de sécurité sous pression Expired - Lifetime EP0637564B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT153393A AT400177B (de) 1993-08-02 1993-08-02 Sicherheitseinrichtung mit druckbeaufschlagtem sicherheitsventil
AT1533/93 1993-08-02
AT153393 1993-08-02

Publications (2)

Publication Number Publication Date
EP0637564A1 EP0637564A1 (fr) 1995-02-08
EP0637564B1 true EP0637564B1 (fr) 1999-09-01

Family

ID=3515564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940890096 Expired - Lifetime EP0637564B1 (fr) 1993-08-02 1994-06-08 Dispositif de sécurité avec soupape de sécurité sous pression

Country Status (3)

Country Link
EP (1) EP0637564B1 (fr)
AT (1) AT400177B (fr)
DE (1) DE59408683D1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1179348B (de) * 1960-03-12 1964-10-08 Demag Zug Gmbh Hydraulischer Hub- bzw. Wippwerks-Arbeitskreis fuer hydraulisch betriebene Mobilkrane
US3433241A (en) * 1966-11-17 1969-03-18 Bendix Corp Pressure limiting device
FR1602987A (fr) * 1968-12-27 1971-03-01
US3595343A (en) * 1969-01-15 1971-07-27 Clark Equipment Co Control system for lift trucks
SE346762C (sv) * 1970-11-04 1979-04-19 Hiab Foco Ab Sperr- och sekerhetsanordning vid hydrauliskt drivna kranar av vippkrantyp
DE2536106A1 (de) * 1975-08-13 1977-02-24 Hubert Odenthal Lastabsicherungsventil
DE3002614A1 (de) * 1980-01-25 1981-07-30 Klaus GmbH & Co Gerätebau KG, 7971 Aitrach Steuerungsanordnung fuer eine parkeinrichtung fuer kraftfahrzeuge

Also Published As

Publication number Publication date
EP0637564A1 (fr) 1995-02-08
AT400177B (de) 1995-10-25
ATA153393A (de) 1995-02-15
DE59408683D1 (de) 1999-10-07

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