EP2354564B1 - Hose rupture proofing for hydraulically actuated lifting devices - Google Patents

Hose rupture proofing for hydraulically actuated lifting devices Download PDF

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Publication number
EP2354564B1
EP2354564B1 EP20100014584 EP10014584A EP2354564B1 EP 2354564 B1 EP2354564 B1 EP 2354564B1 EP 20100014584 EP20100014584 EP 20100014584 EP 10014584 A EP10014584 A EP 10014584A EP 2354564 B1 EP2354564 B1 EP 2354564B1
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EP
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Prior art keywords
safety valve
load
valve
valve stem
hydraulic fluid
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EP20100014584
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German (de)
French (fr)
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EP2354564A1 (en
Inventor
Gerhard Dipl.-Tech.-Ing. Ditter
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Seal Concept GmbH
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Seal Concept GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • 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
    • F15B20/005—Leakage; Spillage; Hose burst

Definitions

  • the invention relates to a device for pipe rupture protection for hydraulically operated hoists.
  • a safety valve is installed in the hydraulic line between the main spool and the lifting cylinder of the hoist, through which the hydraulic fluid flows when lifting the load to the lifting cylinder and lowering the load from the lifting cylinder.
  • the safety valve is usually mounted directly on the hydraulic cylinder of the hoist.
  • the main spool is located near the pump. Since it can not be ruled out that a pipe break in the hydraulic line between the main spool and the safety valve may occur, measures must be taken to prevent that in such a case when lowering the load can crash.
  • the safety valve is used for this purpose. Its function is to ensure that in case of pipe rupture, the then inevitable sinking of the load is sufficiently slowed down and the load does not crash.
  • the stipulation is that the increase in the load sink velocity in the case of a pipe rupture may reach a maximum of 100% of the set speed, ie the load may fall no more than twice as fast in the event of a pipe rupture as occurs during normal lowering of the load.
  • Usual load lowering speeds are adjustable in the range between 0 and 200 mm per second.
  • the arrangement is such that when lowering the load, the safety valve opens only after the main slide and thus the sensitivity of the control of the load speed depends on the conditions of the safety valve.
  • control pressure generated by a spool which controls the main spool when lifting and lowering the load, is also applied to the valve stem of the safety valve when the load is lowered in order to open it against a spring biasing it in the closing direction.
  • the sensitivity of the control is currently placed in the safety valve in the case of new designs, while the main valve is practically " black / white "is switched, so on the sensitivity of the hydraulic fluid control has no share. But because the fine control of the hydraulic fluid flow in the system takes place when lowering through the safety valve, its control characteristic must be at least as good as that at the spool. This means a high technical effort on the safety valve. This effort is also negative in terms of cost and thus negatively in price.
  • the object of the invention is to eliminate the need for placed in the safety valve considerable expense and bring the pipe burst safety aspect in a simpler manner the more effective.
  • the conditions are such that the opening force generated by the control pressure to lower the load on the valve spindle of the safety valve alone is not sufficient to displace the valve spindle counter to its spring bias into the open position. Rather, to open the safety valve to lower the load and the static pressure of the hydraulic fluid in the hydraulic line required between the safety valve and the main spool, which generates an additional opening force via a corresponding annular surface on the valve stem of the safety valve. Only when these two opening forces are added can the safety valve be opened to lower the load.
  • the static pressure of the hydraulic fluid in the hydraulic line alone is just as little sufficient as the coming from the spool control pressure.
  • the conditions in the arrangement according to the invention over the conventional practice are reversed. While in the conventional arrangement, when lowering the load, first the main spool opens and then the safety valve, in the arrangement according to the invention, the order can be reversed, i. First the safety valve opens, and then the control of the lowering and the lowering speed of the load is carried out via the spool valve. A special sensitivity of the safety valve is not necessary in this case, so that here constructive effort can be saved and costs can be reduced.
  • Fig. 1 shows a schematic diagram of a hydraulic hoist with a main spool 1, a lifting cylinder 2, which acts on a load 3, and a safety valve 4, which is mounted directly on the lifting cylinder 2.
  • the hydraulic fluid pump and the hydraulic line from the pump to the main spool 1 are not shown.
  • the main spool 1 is formed as a proportional valve, which is acted upon via a spool 7 with a control pressure, which causes the displacement of the main spool in the respectively desired open position for raising or lowering the load.
  • the two schematic arrows 1a and 1b on both sides of the main spool 1 denote the control pressure action directions when lifting or lowering the load. It should be noted that for reasons of clarity in Fig. 1 the control pressure line from the spool 7 to the main spool 1 is not shown, there are only the control pressure lines 7a and 7b from the spool to the main spool 1 and the safety valve 4 for lowering the load shown. Only when lowering the load is a Steuerpecializingbeetzstoffschung the safety valve. 4
  • Fig. 2 shows in axial section the safety valve. 4
  • a valve spindle 45 is displaceable against the acting in the closing direction biasing pressure of a spring 46 in the opening direction.
  • the valve spindle 45 has a pointing in the drawing to the right, around the spindle shaft running around annular end face region 45a, on which the static pressure of the hydraulic fluid in the hydraulic line 5 via the terminal 42 acts.
  • a piston 47 acts on the right side in the drawing surface 47a of the control pressure from the control pressure line 7a via the terminal 44 acts.
  • a check valve sleeve 48 which is biased in the closing direction (in the drawing to the left) by a spring 49.
  • the check valve sleeve 48 When lifting the load, the check valve sleeve 48 is displaced by the hydraulic fluid against the bias of the spring 49 to the right, while the valve stem 45 remains in position.
  • the check valve sleeve 48 In its closed position, the check valve sleeve 48, when the valve stem 45 is also in its closed position, cooperates with a conical surface region of the valve stem.
  • the closed position of the check valve sleeve 48 is defined by a not visible in the drawing stop.
  • the safety valve To lower the load, the safety valve must be opened by moving the valve stem 45 in the drawing to the left, while the check valve sleeve 48 remains in its closed position.
  • the opening force required to open the check valve is generated partly by the control pressure acting on the piston 47 and partly by the static hydraulic fluid pressure acting on the annular surface 45a. Only when both pressures add up, which requires a sufficiently high static hydraulic fluid pressure, the safety valve can be opened. For this purpose, neither the static pressure of the hydraulic fluid alone nor the control pressure alone is sufficient. This is achieved by appropriate design of the spring 46 in relation to the pressures occurring during operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)

Description

Die Erfindung betrifft eine Einrichtung zur Rohrbruchsicherung für hydraulisch betätigte Hebezeuge.The invention relates to a device for pipe rupture protection for hydraulically operated hoists.

Bei hydraulisch betätigten Hebezeugen, nämlich hydraulischen Kränen und ähnlichen Geräten, ist in der Hydraulikleitung zwischen dem Hauptschieber und dem Hubzylinder des Hebezeugs ein Sicherheitsventil eingebaut, durch welches die Hydraulikflüssigkeit beim Heben der Last zum Hubzylinder und beim Senken der Last aus dem Hubzylinder strömt.In hydraulically operated hoists, namely hydraulic cranes and similar devices, a safety valve is installed in the hydraulic line between the main spool and the lifting cylinder of the hoist, through which the hydraulic fluid flows when lifting the load to the lifting cylinder and lowering the load from the lifting cylinder.

Dabei ist das Sicherheitsventil üblicherweise direkt am Hydraulikzylinder des Hebezeugs angebaut. Der Hauptschieber befindet sich davon entfernt nahe der Pumpe. Da nicht ausgeschlossen werden kann, dass ein Rohrbruch in der Hydraulikleitung zwischen dem Hauptschieber und dem Sicherheitsventil auftreten kann, müssen Maßnahmen getroffen werden, die verhindern, dass in einem solchen Fall beim Senken die Last abstürzen kann. Dazu dient das Sicherheitsventil. Seine Funktion soll sicherstellen, dass im Rohrbruchfall das dann unvermeidlich einsetzende Absinken der Last ausreichend gebremst erfolgt und die Last nicht abstürzt. Die Vorgabe lautet, dass die Zunahme der Lastsinkgeschwindigkeit im Rohrbruchfall maximal 100% der eingestellten Geschwindigkeit erreichen darf, die Last also im Rohrbruchfall höchstens doppelt so schnell absinken darf, wie dies beim normalen Senken der Last geschieht. Übliche Lastabsenkgeschwindigkeiten sind im Bereich zwischen 0 und 200 mm pro Sekunde einstellbar.The safety valve is usually mounted directly on the hydraulic cylinder of the hoist. The main spool is located near the pump. Since it can not be ruled out that a pipe break in the hydraulic line between the main spool and the safety valve may occur, measures must be taken to prevent that in such a case when lowering the load can crash. The safety valve is used for this purpose. Its function is to ensure that in case of pipe rupture, the then inevitable sinking of the load is sufficiently slowed down and the load does not crash. The stipulation is that the increase in the load sink velocity in the case of a pipe rupture may reach a maximum of 100% of the set speed, ie the load may fall no more than twice as fast in the event of a pipe rupture as occurs during normal lowering of the load. Usual load lowering speeds are adjustable in the range between 0 and 200 mm per second.

Bei herkömmlichen Rohrbruchsicherungseinrichtungen ist die Anordnung so getroffen, dass beim Senken der Last das Sicherheitsventil erst nach dem Hauptschieber öffnet und damit die Feinfühligkeit der Steuerung der Lastgeschwindigkeit von den Gegebenheiten des Sicherheitsventils abhängt.In conventional pipe rupture protection devices, the arrangement is such that when lowering the load, the safety valve opens only after the main slide and thus the sensitivity of the control of the load speed depends on the conditions of the safety valve.

Der von einem Steuerschieber erzeugte Steuerdruck, der den Hauptschieber beim Heben und Senken der Last steuert, wird beim Senken der Last auch an die Ventilspindel des Sicherheitsventils angelegt, um dieses entgegen einer sie in Schließrichtung vorspannenden Feder zu öffnen.The control pressure generated by a spool, which controls the main spool when lifting and lowering the load, is also applied to the valve stem of the safety valve when the load is lowered in order to open it against a spring biasing it in the closing direction.

Basierend auf der Annahme, dass die Feinfühligkeit des Sicherheitsventils gerade auch deshalb erforderlich ist, weil es im Rohrbruchfall den Hydraulikflüssigkeitsabfluß zuverlässig auf ein sicheres Maß drosseln muß, wird gegenwärtig bei Neukonstruktionen von vornherein die Feinfühligkeit der Steuerung in das Sicherheitsventil gelegt, während der Hauptschieber praktisch "schwarz/weiß" geschaltet wird, also an der Feinfühligkeit der Hydraulikflüssigkeitssteuerung keinen Anteil hat. Weil aber die Feinsteuerung des Hydraulikflüssigkeitsflusses im System beim Senken durch das Sicherheitsventil erfolgt, muß dessen Steuerungscharakteristik mindestens genauso gut sein wie diejenige am Steuerschieber. Dies bedeutet einen hohen technischen Aufwand am Sicherheitsventil. Dieser Aufwand macht sich auch kostenmäßig und damit preislich negativ bemerkbar.Based on the assumption that the sensitivity of the safety valve is required precisely because it must reliably reduce the hydraulic fluid drainage to a safe level in the event of pipe rupture, the sensitivity of the control is currently placed in the safety valve in the case of new designs, while the main valve is practically " black / white "is switched, so on the sensitivity of the hydraulic fluid control has no share. But because the fine control of the hydraulic fluid flow in the system takes place when lowering through the safety valve, its control characteristic must be at least as good as that at the spool. This means a high technical effort on the safety valve. This effort is also negative in terms of cost and thus negatively in price.

DE 196 08 801 zeigt eine Rohrbruchsicherungseinrichtung der bekannten Art. DE 196 08 801 shows a pipe rupture protection device of the known type.

Aufgabe der Erfindung ist es, die Notwendigkeit des in das Sicherheitsventil gelegten erheblichen Aufwands zu eliminieren und den Rohrbruchsicherheitsaspekt in einfacherer Weise um so wirksamer zur Geltung zu bringen.The object of the invention is to eliminate the need for placed in the safety valve considerable expense and bring the pipe burst safety aspect in a simpler manner the more effective.

Diese Aufgabe wird gemäß der Erfindung durch die im Schutzanspruch angegebene Anordnung gelöst.This object is achieved according to the invention by the arrangement specified in the protection claim.

Bei der erfindungsgemäßen Anordnung sind die Verhältnisse so getroffen, dass der zum Senken der Last auf die Ventilspindel des Sicherheitsventils durch den Steuerdruck erzeugte Öffnungskraft allein nicht ausreicht, die Ventilspindel entgegen ihrer Federvorspannung in die Öffnungsstellung zu verschieben. Vielmehr ist zum Öffnen des Sicherheitsventils zum Senken der Last auch noch der statische Druck der Hydraulikflüssigkeit in der Hydraulikleitung zwischen dem Sicherheitsventil und dem Hauptschieber erforderlich, der über eine entsprechende Ringfläche an der Ventilspindel des Sicherheitsventils eine zusätzliche Öffnungskraft erzeugt. Nur bei Addition dieser beiden Öffnungskräfte kann das Sicherheitsventil zum Senken der Last geöffnet werden. Der statische Druck der Hydraulikflüssigkeit in der Hydraulikleitung allein reicht dazu ebenso wenig aus wie der vom Steuerschieber kommende Steuerdruck.In the arrangement according to the invention, the conditions are such that the opening force generated by the control pressure to lower the load on the valve spindle of the safety valve alone is not sufficient to displace the valve spindle counter to its spring bias into the open position. Rather, to open the safety valve to lower the load and the static pressure of the hydraulic fluid in the hydraulic line required between the safety valve and the main spool, which generates an additional opening force via a corresponding annular surface on the valve stem of the safety valve. Only when these two opening forces are added can the safety valve be opened to lower the load. The static pressure of the hydraulic fluid in the hydraulic line alone is just as little sufficient as the coming from the spool control pressure.

Damit sind die Verhältnisse bei der erfindungsgemäßen Anordnung gegenüber der herkömmlichen Praxis umgekehrt. Während bei der herkömmlichen Anordnung beim Senken der Last zuerst der Hauptschieber öffnet und dann das Sicherheitsventil, kann bei der erfindungsgemäßen Anordnung die Reihenfolge umgekehrt werden, d.h. zuerst öffnet das Sicherheitsventil, und dann erfolgt die Steuerung des Absenkens und der Absenkgeschwindigkeit der Last über den Steuerschieber. Eine besondere Feinfühligkeit des Sicherheitsventils ist in diesem Fall nicht notwendig, so dass hier konstruktiver Aufwand eingespart und Kosten gesenkt werden können.Thus, the conditions in the arrangement according to the invention over the conventional practice are reversed. While in the conventional arrangement, when lowering the load, first the main spool opens and then the safety valve, in the arrangement according to the invention, the order can be reversed, i. First the safety valve opens, and then the control of the lowering and the lowering speed of the load is carried out via the spool valve. A special sensitivity of the safety valve is not necessary in this case, so that here constructive effort can be saved and costs can be reduced.

Trotz der Vereinfachung des Sicherheitsventils aber bei der erfindungsgemäßen Anordnung noch ein wesentlich höherer Sicherheitsstandard erreicht. Denn bei der erfindungsgemäßen Rohrbruchsicherungseinrichtung wird, falls tatsächlich ein Rohrbruch auftreten sollte, das Sicherheitsventil nicht, wie bei herkömmlichen Anordnungen in einer fixen Position gehalten, sondern wegen des Abfalls der auf die Ventilspindel des Sicherheitsventils wirkenden Öffnungskraft schließt dieses und bremst daher das Absinken der Last ganz erheblich.Despite the simplification of the safety valve but achieved in the inventive arrangement still a much higher safety standard. Because in the pipe burst protection device according to the invention, if a pipe break should actually occur, the safety valve is not held, as in conventional arrangements in a fixed position, but because of the drop in the force acting on the valve stem of the safety valve opening force closes this and therefore slows down the load completely considerably.

Denn ein Rohrbruch in der Hydraulikleitung zwischen dem Hauptschieber und dem Sicherheitsventil beim Senken der Last bewirkt einen erheblichen und im Normalfall einen vollständigen Abfall des statischen Drucks, so dass der vom statischen Druck der Hydraulikflüssigkeit auf die Ventilspindel des Sicherheitsventils ausgeübte Öffnungskraftkomponente wegfällt und nur noch die vom Steuerdruck erzeugte Öffnungskraftkomponente anliegt, die aber nicht ausreicht, das Sicherheitsventil entgegen der Federvorspannung in Schließrichtung auf die Ventilspindel zu öffnen. Dies bedeutet, dass im Rohrbruchfall das Sicherheitsventil mindestens weitgehend, wenn nicht gar vollständig schließt.Because a pipe break in the hydraulic line between the main spool and the safety valve when lowering the load causes a significant and normally a complete drop in static pressure, so that the pressure exerted by the static pressure of the hydraulic fluid on the valve stem of the safety valve opening force component is eliminated and only the Control pressure generated opening force component is present, but not sufficient to open the safety valve against the spring preload in the closing direction on the valve stem. This means that in the event of pipe rupture the safety valve closes at least largely, if not completely.

Die Erfindung wird nachstehend anhand der anliegenden Zeichnungen mehr im einzelnen erläutert. In den Zeichnungen zeigt:

Fig. 1
ein schematisches Strömungsschaltbild, und
Fig. 2
einen Axialschnitt durch das Sicherheitsventil.
The invention will be explained in more detail below with reference to the accompanying drawings. In the drawings shows:
Fig. 1
a schematic flow diagram, and
Fig. 2
an axial section through the safety valve.

Fig. 1 zeigt ein schematisches Schaltbild eines hydraulischen Hebezeugs mit einem Hauptschieber 1, einem Hubzylinder 2, der auf eine Last 3 wirkt, und einem Sicherheitsventil 4, das unmittelbar an den Hubzylinder 2 angebaut ist. Fig. 1 shows a schematic diagram of a hydraulic hoist with a main spool 1, a lifting cylinder 2, which acts on a load 3, and a safety valve 4, which is mounted directly on the lifting cylinder 2.

Zwischen dem Hauptschieber 1 und dem Sicherheitsventil 4 verläuft eine Hydraulikmittelleitung, durch welche Hydraulikflüssigkeit zum und vom Hubzylinder 2 strömen kann. Die Hydraulikmittelpumpe und die Hydraulikleitung von der Pumpe zum Hauptschieber 1 sind nicht dargestellt.Between the main spool 1 and the safety valve 4 extends a hydraulic medium line through which hydraulic fluid can flow to and from the lifting cylinder 2. The hydraulic fluid pump and the hydraulic line from the pump to the main spool 1 are not shown.

In der Hydraulikleitung 5 zwischen dem Hauptschieber 1 und dem Sicherheitsventil 4 ist nur beispielhaft und schematisch eine Stelle 6 markiert, an der ein Rohrbruch auftreten könnte.In the hydraulic line 5 between the main spool 1 and the safety valve 4 is only exemplary and schematically a point 6 marked, at which a pipe break could occur.

Der Hauptschieber 1 ist als Proportionalventil ausgebildet, das über einen Steuerschieber 7 mit einem Steuerdruck beaufschlagbar ist, der das Verschieben des Hauptschiebers in die jeweils gewünschte Öffnungsstellung zum Heben oder Senken der Last bewirkt. Die beiden schematischen Pfeile 1a und 1b an beiden Seiten des Hauptschiebers 1 bezeichnen die Steuerdruckwirkungsrichtungen beim Heben bzw. Senken der Last. Zu beachten ist, dass aus Gründen der Klarheit in Fig. 1 die Steuerdruckleitung vom Steuerschieber 7 zum Hauptschieber 1 nicht dargestellt ist, es sind nur die Steuerdruckleitungen 7a und 7b vom Steuerschieber zum Hauptschieber 1 und zum Sicherheitsventil 4 zum Senken der Last eingezeichnet. Nur beim Senken der Last erfolgt eine Steuerdruckbeaufschlagung des Sicherheitsventils 4.The main spool 1 is formed as a proportional valve, which is acted upon via a spool 7 with a control pressure, which causes the displacement of the main spool in the respectively desired open position for raising or lowering the load. The two schematic arrows 1a and 1b on both sides of the main spool 1 denote the control pressure action directions when lifting or lowering the load. It should be noted that for reasons of clarity in Fig. 1 the control pressure line from the spool 7 to the main spool 1 is not shown, there are only the control pressure lines 7a and 7b from the spool to the main spool 1 and the safety valve 4 for lowering the load shown. Only when lowering the load is a Steuerdruckbeaufschlagung the safety valve. 4

Fig. 2 zeigt im Axialschnitt das Sicherheitsventil 4. Fig. 2 shows in axial section the safety valve. 4

Im Gehäuse 41 sind Anschlüsse 42 für die Hydraulikleitung 5, 43 für die Verbindung zum Hubzylinder 2, und 44 für den Anschluß der Steuerdruckleitung 7b gebildet. Im Gehäuse ist eine Ventilspindel 45 gegen den in Schließrichtung wirkenden Vorspanndruck einer Feder 46 in Öffnungsrichtung verschiebbar. Die Ventilspindel 45 weist einen in der Zeichnung nach rechts weisenden, um den Spindelschaft herumverlaufenden ringförmigen Stirnflächenbereich 45a auf, auf welchen der statische Druck der Hydraulikflüssigkeit in der Hydraulikleitung 5 über den Anschluß 42 wirkt.In the housing 41 are ports 42 for the hydraulic line 5, 43 for the connection to the lifting cylinder 2, and 44 for the connection of the control pressure line 7b formed. In the housing, a valve spindle 45 is displaceable against the acting in the closing direction biasing pressure of a spring 46 in the opening direction. The valve spindle 45 has a pointing in the drawing to the right, around the spindle shaft running around annular end face region 45a, on which the static pressure of the hydraulic fluid in the hydraulic line 5 via the terminal 42 acts.

Auf das vordere Stirnende der Spindel 45 wirkt ein Kolben 47, auf dessen in der Zeichnung rechte Stirnfläche 47a der Steuerdruck aus der Steuerdruckleitung 7a über den Anschluß 44 wirkt.On the front end face of the spindle 45, a piston 47 acts on the right side in the drawing surface 47a of the control pressure from the control pressure line 7a via the terminal 44 acts.

Weiter ist im Gehäuse 41 um den Schaft der Ventilspindel 45 herum eine Rückschlagventilhülse 48 angeordnet, die in Schließrichtung (in der Zeichnung nach links) mittels einer Feder 49 vorgespannt ist. Beim Heben der Last wird die Rückschlagventilhülse 48 durch die Hydraulikflüssigkeit entgegen der Vorspannung der Feder 49 nach rechts verschoben, während die Ventilspindel 45 in ihrer Position bleibt. In ihrer Schließstellung wirkt die Rückschlagventilhülse 48, wenn die Ventilspindel 45 sich ebenfalls in ihrer Schließposition befindet, mit einem Konusflächenbereich der Ventilspindel zusammen. Die Schließstellung der Rückschlagventilhülse 48 ist durch einen in der Zeichnung nicht erkennbaren Anschlag festgelegt.Further, in the housing 41 around the shaft of the valve stem 45 around a check valve sleeve 48 is arranged, which is biased in the closing direction (in the drawing to the left) by a spring 49. When lifting the load, the check valve sleeve 48 is displaced by the hydraulic fluid against the bias of the spring 49 to the right, while the valve stem 45 remains in position. In its closed position, the check valve sleeve 48, when the valve stem 45 is also in its closed position, cooperates with a conical surface region of the valve stem. The closed position of the check valve sleeve 48 is defined by a not visible in the drawing stop.

Zum Senken der Last muß das Sicherheitsventil durch Bewegen der Ventilspindel 45 in der Zeichnung nach links geöffnet werden, während die Rückschlagventilhülse 48 in ihrer Schließposition verbleibt. Die zum Öffnen des Rückschlagventils notwendige Öffnungskraft wird zum einen Teil durch den auf den Kolben 47 wirkenden Steuerdruck, und zum anderen Teil durch den auf die Ringfläche 45a wirkenden statischen Hydraulikflüssigkeitsdruck erzeugt. Nur wenn beide Drücke sich addieren, was einen ausreichend hohen statischen Hydraulikflüssigkeitsdruck erfordert, kann das Sicherheitsventil geöffnet werden. Dazu reicht weder der statische Druck der Hydraulikflüssigkeit allein noch der Steuerdruck allein aus. Dies wird durch entsprechende Bemessung der Feder 46 in Relation zu den im Betrieb auftretenden Drücken erreicht.To lower the load, the safety valve must be opened by moving the valve stem 45 in the drawing to the left, while the check valve sleeve 48 remains in its closed position. The opening force required to open the check valve is generated partly by the control pressure acting on the piston 47 and partly by the static hydraulic fluid pressure acting on the annular surface 45a. Only when both pressures add up, which requires a sufficiently high static hydraulic fluid pressure, the safety valve can be opened. For this purpose, neither the static pressure of the hydraulic fluid alone nor the control pressure alone is sufficient. This is achieved by appropriate design of the spring 46 in relation to the pressures occurring during operation.

Im Falle eines Rohrbruchs in der Hydraulikleitung 5 fällt der statische Druck in der Hydraulikleitung 5 in sich zusammen, so dass die Öffnungsdruckkomponente an der Ringfläche 45a wegfällt und nur noch der Steuerdruck über den Kolben 47 auf die Sicherheitsventilspindel 45 wirkt. Dieser ist aber kleiner als der Vorspanndruck der Feder 46, so dass das Sicherheitsventil schließt.In the event of a pipe break in the hydraulic line 5, the static pressure in the hydraulic line 5 collapses so that the opening pressure component on the annular surface 45a is eliminated and only the control pressure via the piston 47 acts on the safety valve spindle 45. However, this is smaller than the biasing pressure of the spring 46, so that the safety valve closes.

Claims (1)

  1. Pipe rupture protection for hydraulically operated hoisting gear, which is to be arranged at the or near the lifting cylinder (2) of the hoisting gear and is mounted into the hydraulic line (5) between a master gate (1) and the lifting cylinder (2), with a valve stem (45) pretensioned into the closing direction by means of a spring (46), onto which, during lowering of the load, an opening force can be applied via a control pressure, and on which an area portion (45a) is provided, characterised in that the static pressure of the hydraulic fluid in the hydraulic line (5) applies an opening force component onto the valve stem via the area portion, wherein the spring (46) pretensioning the valve stem (45) into the closing direction is dimensioned in such a way that the opening force component acting on the valve stem via the control pressure for opening the safety valve is not sufficient to move the valve stem into the opening direction without an opening force component generated by the static pressure of the hydraulic fluid.
EP20100014584 2010-01-30 2010-11-13 Hose rupture proofing for hydraulically actuated lifting devices Active EP2354564B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201020001599 DE202010001599U1 (en) 2010-01-30 2010-01-30 Pipe rupture protection for hydraulically operated hoists

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EP2354564A1 EP2354564A1 (en) 2011-08-10
EP2354564B1 true EP2354564B1 (en) 2013-01-02

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DE (1) DE202010001599U1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103232005B (en) * 2013-05-08 2015-09-02 昆山晋桦豹胶轮车制造有限公司 A kind of hydraulic lifting apparatus with pipeline explosion-proof function
DE102016008442A1 (en) * 2016-07-01 2018-01-04 Daimler Ag tank valve
AU2018202033B2 (en) * 2017-03-23 2023-06-01 The Raymond Corporation Systems and methods for mast stabilization on a material handling vehicle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8702521U1 (en) * 1987-02-19 1987-06-25 Knippenberg, Peter, 4350 Recklinghausen Lowering brake valve for hydraulic cylinder
DE19608801C2 (en) * 1996-03-07 2000-06-08 Oil Control Gmbh Hydraulic load holding or lowering brake valve
NO330016B1 (en) * 2009-04-22 2011-02-07 Tor Henrik Vik Energy recovery

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DE202010001599U1 (en) 2010-06-02

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