EP3091239A1 - Safety device - Google Patents
Safety device Download PDFInfo
- Publication number
- EP3091239A1 EP3091239A1 EP16000686.2A EP16000686A EP3091239A1 EP 3091239 A1 EP3091239 A1 EP 3091239A1 EP 16000686 A EP16000686 A EP 16000686A EP 3091239 A1 EP3091239 A1 EP 3091239A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- valve
- safety device
- valve housing
- tank
- 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.)
- Pending
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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
- F15B20/007—Overload
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- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
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- 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
- F15B2211/8636—Circuit failure, e.g. valve or hose failure
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- 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
- F15B2211/8643—Control during or prevention of abnormal conditions the abnormal condition being a human failure
Definitions
- the invention relates to a safety device in the manner of a hydraulic Tank Kunststoffabêt.
- self-propelled vehicles have their own hydraulic system, which is driven directly by the engine of the machine.
- towed work machines either the pump of a separate hydraulic system on the machine is driven by the PTO of a tractor or the oil supply of the working machine is taken over directly by the tractor pump.
- a safety device which is designed in particular as a so-called. Pipe rupture protection, wherein a arranged in a valve housing valve element of a closing valve by means of a control device in an open basic position a fluid-conducting connection between two connection points in the valve housing of the closing valve releases, of which a connection point via a connecting line connected to a hydraulic consumer.
- a bypass device which is connected to said connecting line and the closing valve, in case of failure with a corresponding pressure loss against the action of the control device, the valve element in its the fluid-carrying connection between the two connection points of the valve housing blocking position is moved.
- the present invention seeks to provide a space-saving building, fast-acting safety device, which makes it possible in the case of misconnection of hydraulic supply lines or forgetting to make the connection, to ensure that in that respect If no hydraulic component connected to a hydraulic circuit is damaged or even destroyed. Furthermore, should ensure the safety device in the manner of a hydraulic tank pressure protection even in normal operation, a safe function of the hydraulic circuit connected to the hydraulic components.
- a related object solves a safety device with the features of claim 1 in its entirety.
- the hydraulic tank pressure protection according to the invention has the task of the pressure supply connection respectively the P-channel when a permissible tank pressure is exceeded, it must be sealed in a seat-tight manner, whereby the tank pressure can then no longer increase.
- the safety device according to the invention comes, as stated, with little components that can be summarized in blocks in the manner of a kit for the purpose of integrated installation in the hydraulic supply circuit of a working machine, such as a tractor or a tillage implement.
- a working machine such as a tractor or a tillage implement.
- one or the other valve piston is used in a controlling manner with regard to the various connections within the valve housing automatically.
- the valve housing may be integrally formed; but there is also the possibility of construction in multi-housing technology. In the latter case, the then spatially separated housing parts, each with different connections and one valve piston in a variety of ways can be fluidly connected to each other in order to ensure the function of the safety device as a hydraulic tank pressure protection.
- the safety device quickly controls the connections to be influenced in the valve housing with the respective valve piston, so that the reaction of the safety device is already present almost at the same time as the malfunction occurs.
- the fact that the two spring-loaded valve piston can "feel" the pressure changes caused by the disturbance immediately and "process” immediately, the hydraulic components potentially damaging pressure peaks are avoided with certainty. Further advantageous embodiments of the safety device according to the invention are the subject of the dependent claims.
- the safety device after the Fig. 1 shows a block-like valve housing 10, in the direction of the Fig. 1 seen on the bottom of a pressure supply port P E and a tank port T E are introduced.
- two useful connections P A, T A are present, which open out via corresponding connecting lines into a central control block 12.
- the pressure supply connection P E is connected to a stylized reproduced pressure supply source 14, for example in the form of a conventional hydraulic pump.
- This hydraulic pump 14 is supplied in the usual way from a storage tank T, to which the tank connection T E of the valve housing 10 is connected on the discharge side.
- the two payload connections P A , T A which are connected to the control block 12, ensure the pressure supply for at least one hydraulic consumer via the port P A , returning hydraulic oil is returned via the useful port T A tank side into the valve housing 10.
- valve housing block 10 is transverse drilled and thus has a continuous horizontal central channel 16.
- two spring-loaded valve piston 18, 20 are provided opposite each other. Both valve pistons 18, 20 are longitudinally displaceable within the valve housing 10 in the region of the central channel 16 and guided independently of each other. Furthermore, both valve pistons 18, 20 are supported on an assignable compression spring 22 or 24 as energy storage.
- the central channel 16 is divided into different spaces and has a first piston chamber 26, in which the first piston 18 is guided longitudinally movable.
- the first valve piston 18 assumes its maximum shifted to the left end position, in which the pressure supply port P E is connected to the working port P A pressurized. Furthermore, a second valve piston 20 is arranged in a further second piston chamber 28, which is guided on the closure element 62, which in its in Fig. 1 shown open position, the fluid-carrying path between the tank port T E and the other other useful port T A from the side of the control block 12 releases. In the locked or closed position of the second valve piston 20 of the pertinent fluid path is then interrupted.
- the indices E used for the terminals P E , T E and P A , T A stand for input and A for output.
- both valve piston 18, 20 under the action of their respective compression spring 22, 24 in frontal contact with each other and both valve piston 18, 20 are, as already stated, in its open position within the valve housing 10th
- the first valve piston 18 consists of several piston parts, wherein the two adjacent piston parts 30, 32 via a piston rod 34 as another Piston part are firmly connected to each other, wherein preferably the piston rod 34 and the guide 32 made in one piece and with the piston member 30, for example by screwing, are firmly connected.
- the two substantially cylindrically shaped piston parts 30, 32 have on their mutually facing end faces each have a contact surface 36, 38 which are engageable with each adjacent adjacently abutment surfaces 40, 42 in the valve housing 10, which limit the first piston chamber 26 with.
- the contact surface 36 of the second piston part 32 in abutment with the one stop surface 40 in the valve housing 10.
- a spring chamber 44 in which the first compression spring 22 extends, equal in diameter to the adjacent first piston chamber 26 executed, but discontinued in its penetration.
- Spring chamber 44 and piston chamber 26 have the same diameter; however, the diameter between these spaces 26 and 44 is reduced.
- the first piston member 30 has a web-like extension 46 in the manner of a control rod, the free end face in abutment with the opposite free end of the second valve piston 20.
- the second valve piston 20 is with its piston member 48, the crowned and stepped is executed along a central guide 50 in the valve housing 10 guided llvessverfahrbar, and in the event of a malfunction at the pressure supply port P E and / or the tank port T E , this piston member 48 spring-loaded get into its closed position, as exemplified in the Fig. 2 and 3 is shown for the safety device according to the invention.
- a sealing bevel 52, 54 is provided on the respective end face facing the pressure supply port P E or the other useful port T A , which is cylindrical, but preferably designed as a sealing cone or sealing dome, and which is designed to run around correspondingly arranged sealing edges, once cylindrical 56 formed, once formed in the manner of a cone 58, which limit the respective piston chamber 26, 28, each formed a seat-tight closing valve.
- the cone-shaped sealing edge 58 divides the second piston chamber 28 into two subspaces, the tank port T E opening radially into the first subspace and the returning user port T A coming from the control block 12 into the other subspace.
- the first piston chamber 26 can also be subdivided into two subspaces, wherein the pressure supply port P E opens radially into the one subspace and the pressure-supplying useful port T A leading to the control block 12 into the other pressure chamber. If the sealing slope 52 of the first valve piston 18 is located on the right-hand cylindrical sealing edge 56, which is part of the second stop surface 42 and bounded by the valve housing 10, then these two subspaces of the first piston chamber 26 are also separated from one another and thus the pressure supply port P E of FIG pressure-supplying utility connection P A separately.
- valve block 10 is further constructed in the manner of a cartridge system, ie the individual valve components can be integrated into the block 10 from both sides of the block in a screw-in technique.
- the kit with the compression spring 22 can be closed to the outside.
- tank pressure is also on the first valve piston 18, as far as this limits the second piston chamber 28 to the right with its left free end face. As long as the mentioned tank pressure does not exceed the spring pressure applied by the first compression spring 22 to the first valve piston 18, so long as the first piston 18 does not experience any movement and the safety device remains in the in Fig. 1 shown normal operating position.
- the pertinent first piston part 30 has on the outer peripheral side a sealing and guiding system 64, which on the one hand separates the adjacent fluid passages P A and T A and on the other hand allows a low-friction guidance of the first valve piston 18 within the central passage 26 of the valve housing 10.
- the second piston part 32 has lifted from the first stop surface 40, whereas the so far tracked first piston member 30 with its first sealing slope 52 in abutment with the cylindrically shaped first sealing edge 56 within the valve housing 10. Because of the simpler presentation was in the Fig.
- Fig. 2 reproduced a kind of accident for the safety device, in which although the pressure line is connected from the side of the pressure supply source or hydraulic pump 14; However, there is no connected tank line to the tank T or the pertinent tank line has dropped, which is in Fig. 2 Stylized at the end of the connecting line with a cross in the circle indicated.
- the further second valve piston 20 then follows the movement of the first valve piston 18 from left to right due to its second compression spring 24, wherein the piston part 48 of the second valve piston 20 passes under the action of its second compression spring 24 in its closed position, while the tank-side utility T A from tank connection T E.
- the first valve piston 18 in his in the Fig. 2 shown closed position and thus separated the pressure supply port P E from the pressure supply utility P A no more control pressure passes into the control block 12 and therefore it can not dergestalt thus to a pressure increase come as that would be destroyed at the control block 12 connected equipment or otherwise adversely affected.
- the second valve piston 20 in turn follows this movement due to its second compression spring 24 and thus closes, as already mentioned, the fluid-carrying connection between the tank connection T E and tank workedem Nutzan gleich T A seat-tight.
- the pressure in the control block 12, the sake of simplicity in the Fig. 3 is also not shown, is then thus limited by the compression spring 22 of the extent acting as a main piston first valve piston 18. Even if, therefore, high pump pressure should come in the direction of the tank connection T E , this does not lead to any overloading with regard to the hydraulic consumers of the hydraulic circuit connected to the control block 12, because precisely the second valve closes in a seat-tight manner via the second valve piston 20.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
1. Sicherheitsvorrichtung. 2. Sicherheitsvorrichtung, bestehend aus mindestens - einem Ventilgehäuse (10), - einem Druckversorgungs(P E )- sowie einem Tankanschluss (T E ), - zwei Nutzanschlüssen (P A , T A ) und - zwei federbelasteten Ventilkolben (18, 20), die innerhalb des Ventilgehäuses (10) längsverfahrbar geführt sind. 1. Safety device. 2. Safety device consisting of at least - a valve housing (10), - a pressure supply (P E) - and a tank connection (T E), - Two user connections (P A, T A) and - Two spring-loaded valve pistons (18, 20) which are guided longitudinally within the valve housing (10).
Description
Die Erfindung betrifft eine Sicherheitsvorrichtung in der Art einer hydraulischen Tankdruckabsicherung. In der Landwirtschaft unterscheidet man regelmäßig zwischen selbstfahrenden und gezogenen Arbeitsmaschinen. Sogenannte Selbstfahrer besitzen ein eigenes Hydrauliksystem, das direkt vom Motor der Maschine angetrieben wird. Bei gezogenen Arbeitsmaschinen wird entweder die Pumpe eines separaten Hydrauliksystems auf der Maschine von der Zapfwelle eines Traktors angetrieben oder die Ölversorgung der Arbeitsmaschine wird direkt von der Traktorpumpe übernommen.The invention relates to a safety device in the manner of a hydraulic Tankdruckabsicherung. In agriculture, there is a regular distinction between self-propelled and towed machines. So-called self-propelled vehicles have their own hydraulic system, which is driven directly by the engine of the machine. In towed work machines either the pump of a separate hydraulic system on the machine is driven by the PTO of a tractor or the oil supply of the working machine is taken over directly by the tractor pump.
Im letzteren Fall, bei der die Ölversorgung vom Traktor übernommen wird, werden die Hydraulikleitungen der gezogenen Arbeitsmaschine mit sog. Schnellkupplungen an den Traktor angeschlossen. Da die Kupplungen oft die gleichen Nennweiten und somit Anschlussgeometrien haben, ist trotz entsprechender Kennzeichnung die Verwechslungsgefahr betreffend die Druckversorgungs- und die Tankleitung recht groß. Ebenso ist es möglich, dass das Anschließen einer der Leitungen vergessen wird oder sich eine der Leitungen durch defekte, verschmutzte oder unsachgemäß montierte Kupplungen während des Betriebs selbständig vom hydraulischen Versorgungskreis trennt und zu Boden fällt.In the latter case, in which the oil supply is taken over by the tractor, the hydraulic lines of the towed machine are connected to the tractor with so-called quick couplings. Since the couplings often have the same nominal diameters and thus connection geometries, the risk of confusion regarding the pressure supply line and the tank line is quite large despite appropriate labeling. Likewise, it is possible that the connection of one of the lines is forgotten or one of the lines by defective, dirty or improperly mounted couplings during operation independently separates from the hydraulic supply circuit and falls to the ground.
Tritt einer dieser Fälle ein, so ist es möglich, dass sich in der Hydraulik der gezogenen Arbeitsmaschine tankseitig schnell ein Druck aufbaut, der das Pumpendruckniveau (250 bar und mehr) erreichen kann. Viele Hydraulikkomponenten halten tankseitig jedoch nur Drücke zwischen 5 bar und 40 bar aus und könnten folglich zerstört werden.If one of these cases occurs, it is possible that in the hydraulics of the drawn working machine tank pressure quickly builds up, the pressure Pump pressure level (250 bar and more) can achieve. However, many hydraulic components only withstand pressures of between 5 bar and 40 bar on the tank side and could therefore be destroyed.
Durch die
Ausgehend von dem vorstehend genannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine platzsparend aufbauende, schnell funktionierende Sicherheitsvorrichtung vorzusehen, die es ermöglicht, im Falle des Fehlanschlusses von hydraulischen Versorgungsleitungen oder beim Vergessen, den Anschluss herzustellen, zu gewährleisten, dass auch in dahingehenden Fällen keine an einen hydraulischen Kreis angeschlossene Hydraulikkomponente beschädigt oder gar zerstört wird. Des Weiteren soll die Sicherheitsvorrichtung in der Art einer hydraulischen Tankdruckabsicherung auch im Normalbetrieb eine sichere Funktion der an den hydraulischen Kreis angeschlossenen Hydraulikkomponenten gewährleisten. Eine dahingehende Aufgabe löst eine Sicherheitsvorrichtung mit den Merkmalen des Patentanspruchs 1 in seiner Gesamtheit.Based on the above-mentioned prior art, the present invention seeks to provide a space-saving building, fast-acting safety device, which makes it possible in the case of misconnection of hydraulic supply lines or forgetting to make the connection, to ensure that in that respect If no hydraulic component connected to a hydraulic circuit is damaged or even destroyed. Furthermore, should ensure the safety device in the manner of a hydraulic tank pressure protection even in normal operation, a safe function of the hydraulic circuit connected to the hydraulic components. A related object solves a safety device with the features of claim 1 in its entirety.
Für einen funktionssicheren Betrieb der Sicherheitsvorrichtung ist vorgesehen, dass diese zumindest aus den folgenden Komponenten aufgebaut ist, mindestens
- einem Ventilgehäuse,
- einem Druckversorgungs- sowie einem Tankanschluss,
- zwei Nutzanschlüssen und
- zwei federbelasteten Ventilkolben, die innerhalb des Ventilgehäuses längsverfahrbar geführt sind.
- a valve housing,
- a pressure supply and a tank connection,
- two utility connections and
- two spring-loaded valve piston, which are guided longitudinally movable within the valve housing.
Werden, wie eingangs erwähnt, gezogene Arbeitsmaschinen, wie Bodenbearbeitungsgeräte, von einer Zugmaschine, wie einem Traktor, mit Öl versorgt, so ergeben sich drei relevante Fälle im Betrieb, die unterschieden werden müssen:
- 1. Normalbetrieb; alle Leitungen sind richtig angeschlossen.
- 2. Druckleitung angeschlossen, Tankleitung nicht angeschlossen oder abgefallen.
- 3. Druck- und Tankleitung sind miteinander vertauscht.
- 1. normal operation; all lines are connected correctly.
- 2. Pressure line connected, tank line not connected or dropped.
- 3. Pressure and tank line are interchanged.
Im ersten Fall hat die hydraulische Tankdruckabsicherung gemäß der Merkmalsausgestaltung des Patentanspruchs 1 lediglich eine überwachende Funktion und die Drücke von Versorgungs- und Tankleitung werden einfach durchgeschleust.In the first case, the hydraulic Tankdruckabsicherung according to the feature configuration of claim 1 only a monitoring function and the pressures of supply and tank line are simply passed through.
Im zweiten Fall hat die hydraulische Tankdruckabsicherung erfindungsgemäß die Aufgabe, den Druckversorgungsanschluss respektive den P-Kanal bei Überschreiten eines zulässigen Tankdrucks sitzdicht abzusperren, wobei der Tankdruck dann nicht weiter ansteigen kann.In the second case, the hydraulic tank pressure protection according to the invention has the task of the pressure supply connection respectively the P-channel when a permissible tank pressure is exceeded, it must be sealed in a seat-tight manner, whereby the tank pressure can then no longer increase.
Im dritten Fall erfolgt mit der erfindungsgemäßen Lösung eine Tankdruckabsicherung, indem bei Überschreiten eines-zulässigen Tankdrucks der Tankanschluss respektive der T-Kanal sitzdicht abgesperrt wird.In the third case takes place with the inventive solution a tank pressure protection by the tank connection respectively the T-channel is sealed seat-tight at a permissible tank pressure is exceeded.
Die erfindungsgemäße Sicherheitsvorrichtung kommt, wie dargelegt, mit wenig Komponenten aus, die sich blockartig in der Art eines Einbausatzes zusammenfassen lassen zwecks integriertem Einbau in den hydraulischen Versorgungskreislauf einer Arbeitsmaschine, wie einem Traktor oder einem Bodenbearbeitungsgerät. Je nachdem, welcher der vorstehend beschriebenen Störfälle vorliegt, kommt der eine oder der andere Ventilkolben in steuernder Weise im Hinblick auf die diversen Anschlüsse innerhalb des Ventilgehäuses automatisch zum Einsatz.The safety device according to the invention comes, as stated, with little components that can be summarized in blocks in the manner of a kit for the purpose of integrated installation in the hydraulic supply circuit of a working machine, such as a tractor or a tillage implement. Depending on which of the incidents described above is present, one or the other valve piston is used in a controlling manner with regard to the various connections within the valve housing automatically.
Das Ventilgehäuse kann einstückig ausgebildet sein; es besteht aber auch die Möglichkeit des Aufbaus in Mehrgehäusetechnik. Im letztgenannten Fall können auch die dann örtlich voneinander separierten Gehäuseteile mit jeweils unterschiedlichen Anschlüssen und je einem Ventilkolben in vielfältiger Weise fluidführend miteinander verschaltet sein, um die Funktion der Sicherheitsvorrichtung als hydraulische Tankdruckabsicherung gewährleisten zu können. Die Sicherheitsvorrichtung steuert mit dem jeweiligen Ventilkolben schnell die zu beeinflussenden Anschlüsse im Ventilgehäuse an, so dass nahezu zeitgleich mit Auftreten der Störung die Reaktion der Sicherheitsvorrichtung bereits vorliegt. Dadurch, dass die beiden federbelasteten Ventilkolben die durch die Störung bedingten Druckänderungen sofort "fühlen" und sofort "verarbeiten" können, sind die die Hydraulikkomponenten möglicherweise schädigenden Druckspitzen mit Sicherheit vermieden. Weitere vorteilhafte Ausgestaltungen der erfindungsgemäßen Sicherheitsvorrichtung sind Gegenstand der Unteransprüche.The valve housing may be integrally formed; but there is also the possibility of construction in multi-housing technology. In the latter case, the then spatially separated housing parts, each with different connections and one valve piston in a variety of ways can be fluidly connected to each other in order to ensure the function of the safety device as a hydraulic tank pressure protection. The safety device quickly controls the connections to be influenced in the valve housing with the respective valve piston, so that the reaction of the safety device is already present almost at the same time as the malfunction occurs. The fact that the two spring-loaded valve piston can "feel" the pressure changes caused by the disturbance immediately and "process" immediately, the hydraulic components potentially damaging pressure peaks are avoided with certainty. Further advantageous embodiments of the safety device according to the invention are the subject of the dependent claims.
Im Folgenden wird die erfindungsgemäße Sicherheitsvorrichtung anhand eines Ausführungsbeispiels nach der Zeichnung näher erläutert. Dabei zeigen die
- Fig. 1 bis 3
- in der Art eines Längsschnittes mit teilweiser Ansicht von Bauteilen (
Fig. 1 ) die erfindungsgemäße Sicherheitsvorrichtung in verschiedenen Betriebszuständen; und - Fig. 4
- in der Art eines hydraulischen Schaltplans die Sicherheitsvorrichtung nach den
Fig. 1 bis 3 .
- Fig. 1 to 3
- in the manner of a longitudinal section with partial view of components (
Fig. 1 ) the safety device according to the invention in different operating states; and - Fig. 4
- in the manner of a hydraulic circuit diagram, the safety device according to the
Fig. 1 to 3 ,
Die Sicherheitsvorrichtung nach der
Wie sich des Weiteren aus der
Wie sich des Weiteren aus der
Der erste Ventilkolben 18 besteht aus mehreren Kolbenteilen, wobei die beiden benachbarten Kolbenteile 30, 32 über eine Kolbenstange 34 als weiteres Kolbenteil miteinander fest verbunden sind, wobei bevorzugt die Kolbenstange 34 und die Führung 32 einstückig ausgeführt und mit dem Kolbenteil 30, beispielsweise durch Einschrauben, fest verbunden sind. Die beiden im Wesentlichen zylindrisch ausgebildeten Kolbenteile 30, 32 weisen auf ihren einander zugewandten Stirnseiten je eine Anlagefläche 36, 38 auf, die mit jeweils benachbart zuordenbaren Anschlagflächen 40, 42 im Ventilgehäuse 10, die den ersten Kolbenraum 26 mit begrenzen, in Anlage bringbar sind. Wie die
An seiner in Blickrichtung auf die
Die konusförmige Dichtkante 58 unterteilt den zweiten Kolbenraum 28 in zwei Teilräume, wobei in den ersten Teilraum der Tankanschluss TE radial einmündet und in den anderen Teilraum der rücklaufende Nutzanschluss TA vom Steuerblock 12 kommend. Auch der erste Kolbenraum 26 lässt sich prinzipiell in zwei Teilräume unterteilen, wobei in den einen Teilraum der Druckversorgungsanschluss PE radial einmündet und in den anderen Druckraum der druckversorgende Nutzanschluss TA, der zum Steuerblock 12 führt. Befindet sich die Dichtschräge 52 des ersten Ventilkolbens 18 an der rechten zylindrischen Dichtkante 56, die insoweit Teil der zweiten Anschlagfläche 42 und begrenzt durch das Ventilgehäuse 10 ist, sind auch insoweit diese beiden Teilräume des ersten Kolbenraums 26 voneinander separiert und mithin der Druckversorgungsanschluss PE vom druckversorgenden Nutzanschluss PA getrennt.The cone-shaped
Für das weitere Verständnis der Funktion der Sicherheitsvorrichtung ist noch wichtig, zu wissen, dass die Druckversorgungsquelle 14 sowie der Tank aufseiten der selbständig verfahrbaren Arbeitsmaschine, wie einem Traktor, liegen und die Ausgangs-Nutzanschlüsse PA und TA nebst Steuerblock 12 sind einer Arbeitsgerätschaft zugeordnet, die sich mit dem Traktor beispielsweise zur Bodenbearbeitung verfahren lässt. Der Ventilblock 10 ist des Weiteren in der Art eines Cartridge-Systems aufgebaut, d.h. die einzelnen Ventilkomponenten lassen sich von beiden Seiten des Blocks in Einschraubtechnik in den Block 10 integrieren. Mittels einer Federkappe 60 lässt sich der Einbausatz mit der Druckfeder 22 nach außen hin verschließen. Des Weiteren ist in Blickrichtung auf die
Bei der in der
Wie sich aus der
Fällt also, wie dargestellt, die Tankleitung am Tankanschluss TE ab, so steigt sofort der Druck in dem Teilraum des zweiten Kolbenraums 28 an, in den der tankseitige Nutzanschluss TA einmündet und der seinen erhöhten Druck vonseiten der gezogenen Arbeitsmaschine im Rücklauf über den Steuerblock 12 erhält. Übersteigt dieser letztgenannte Druck die durch die Druckfeder 22 aufgebrachte Druckkraft, so beginnt sich der erste Ventilkolben 18 entgegen der Wirkung seiner Druckfeder 22 zu verschieben und schließt gemäß der Darstellung nach der
Die in der
In Blickrichtung auf die
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102015005624.7A DE102015005624A1 (en) | 2015-04-30 | 2015-04-30 | safety device |
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Publication Number | Publication Date |
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EP3091239A1 true EP3091239A1 (en) | 2016-11-09 |
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ID=55649995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16000686.2A Pending EP3091239A1 (en) | 2015-04-30 | 2016-03-22 | Safety device |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108895052A (en) * | 2018-09-17 | 2018-11-27 | 宁波真格液压科技有限公司 | A kind of plug-in automatic stop valve |
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DE2758074A1 (en) * | 1977-01-12 | 1978-07-13 | Ford Werke Ag | VALVE ARRANGEMENT FOR THE CONNECTION OF PRESSURE SOURCES TO HYDRAULICALLY OPERATED WORK CYLINDERS |
EP0347562A2 (en) * | 1988-05-19 | 1989-12-27 | Herion-Werke KG | Safety valve |
DE10016026A1 (en) * | 2000-03-31 | 2001-11-29 | Sauer Danfoss Nordborg As Nord | Branching unit, for hydraulic circuit, has pressure feed and return with incorporated safety valve to prevent over pressurization of the return circuit |
DE10016040C1 (en) * | 2000-03-31 | 2001-12-06 | Sauer Danfoss Nordborg As Nord | Hydraulic power coupling device e.g. for tractor tool, has safety valve inserted in pump line operated by pressure in tank line |
DE102011118536A1 (en) | 2011-11-15 | 2013-05-16 | Hydac System Gmbh | Safety device used in hydraulic system, has bypass device to move valve element in closing position for blocking fluid-conveying connection between connection ports during appropriate pressure loss |
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DE3315056C2 (en) * | 1983-04-26 | 1994-02-17 | Bosch Gmbh Robert | Electro-hydraulic multi-way control valve |
DE102011108522B4 (en) * | 2011-07-26 | 2015-03-12 | Festo Ag & Co. Kg | Multi-way valve and method for its operation |
-
2015
- 2015-04-30 DE DE102015005624.7A patent/DE102015005624A1/en active Pending
-
2016
- 2016-03-22 EP EP16000686.2A patent/EP3091239A1/en active Pending
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Publication number | Priority date | Publication date | Assignee | Title |
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DE2758074A1 (en) * | 1977-01-12 | 1978-07-13 | Ford Werke Ag | VALVE ARRANGEMENT FOR THE CONNECTION OF PRESSURE SOURCES TO HYDRAULICALLY OPERATED WORK CYLINDERS |
EP0347562A2 (en) * | 1988-05-19 | 1989-12-27 | Herion-Werke KG | Safety valve |
DE10016026A1 (en) * | 2000-03-31 | 2001-11-29 | Sauer Danfoss Nordborg As Nord | Branching unit, for hydraulic circuit, has pressure feed and return with incorporated safety valve to prevent over pressurization of the return circuit |
DE10016040C1 (en) * | 2000-03-31 | 2001-12-06 | Sauer Danfoss Nordborg As Nord | Hydraulic power coupling device e.g. for tractor tool, has safety valve inserted in pump line operated by pressure in tank line |
DE102011118536A1 (en) | 2011-11-15 | 2013-05-16 | Hydac System Gmbh | Safety device used in hydraulic system, has bypass device to move valve element in closing position for blocking fluid-conveying connection between connection ports during appropriate pressure loss |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108895052A (en) * | 2018-09-17 | 2018-11-27 | 宁波真格液压科技有限公司 | A kind of plug-in automatic stop valve |
Also Published As
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DE102015005624A1 (en) | 2016-11-03 |
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