EP2503161B1 - Hydraulic control valve device - Google Patents

Hydraulic control valve device Download PDF

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Publication number
EP2503161B1
EP2503161B1 EP12157756.3A EP12157756A EP2503161B1 EP 2503161 B1 EP2503161 B1 EP 2503161B1 EP 12157756 A EP12157756 A EP 12157756A EP 2503161 B1 EP2503161 B1 EP 2503161B1
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EP
European Patent Office
Prior art keywords
line
control
valve
pressure
lowering brake
Prior art date
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Active
Application number
EP12157756.3A
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German (de)
French (fr)
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EP2503161A2 (en
EP2503161A3 (en
Inventor
Dr. Wolfgang Kraft
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Linde Hydraulics GmbH and Co KG
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Linde Hydraulics GmbH and Co KG
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Publication of EP2503161A3 publication Critical patent/EP2503161A3/en
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding valves
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding valves
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F15B2211/50527—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves using cross-pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the invention relates to a hydraulic control valve device for controlling a double-acting hydraulic cylinder with a throttling in intermediate positions control valve, which communicates with a delivery line of a pump, guided to a container tank line and to the hydraulic cylinder consumer lines connected, wherein the control valve of a respective hydraulic control pressure in Direction of a control position is actuated, in which a consumer line connected to the feed line inlet side and the other consumer line forms a drain side connected to the container and wherein in the consumer lines each a seat-tight lowering brake valve is arranged to leak oil-free barrier of the hydraulic cylinder, which is a leak-tight blocking position and a Flow position has wherein the arranged in the discharge side seat-tight lowering brake valve of the control pressure of the control valve in the direction of naturalste is operable.
  • a control valve device with a control valve and arranged in the consumer lines seat-tight lowering brake valves is from the DE 102 24 731 A1 known for the control of a tilt drive.
  • the arranged in the respective outlet side of the hydraulic cylinder Senkbremsventile, which are also referred to as overcenter valves, are used for speed control of the consumer movement in the occurrence of a negative load, ie pulling on the hydraulic cylinder and the controlled by the control valve movement of the hydraulic cylinder supporting load in which the outflow side of the Consumer is controlled.
  • the lowering brake valves are provided with a leak-tight blocking position.
  • the leak-proof lowering brake valves thus form combined load-holding and lowering brake valves.
  • the arranged in the drain-side consumer line of the hydraulic cylinder lowering brake valve must be at a corresponding actuation of the control valve in a control position in which provided with the lowering brake consumer line with the container is connected and the drain side forms are turned on in the flow position.
  • A1 known control valve device is arranged in the discharge side leak-proof lowering brake valve in a corresponding actuation of the control valve controlled by the pending in the inlet side of the hydraulic cylinder inlet pressure in the direction of the flow position.
  • a pilot line is arranged on the inlet side of the hydraulic cylinder, which is guided to a vessel to a container line, wherein in the pilot line two throttle means is arranged between which the drive pressure for controlling the arranged in the discharge side lowering brake valve is generated and tapped.
  • the present invention has for its object to provide a control valve device of the type mentioned available, in which a stable control behavior is achieved and power losses are avoided in the control of the lowering brake valves.
  • the arranged in the discharge side seat-tight lowering brake valve is acted upon by the control pressure of the control valve in the direction of the flow position and thus controlled by the control pressure of the control valve.
  • the control pressure which activates the lowering brake valve into the flow position is influenced and varied as a function of the inlet pressure of the hydraulic pressure.
  • the pilot control line provided for actuating the lowering brake valve is guided by a control surface of the lowering brake valve which acts in the direction of a flow position to a control pressure line leading to the control pressure of the control valve, wherein a throttle device is arranged in the pilot control line is and the pilot line between the throttle device and the lowering brake valve is connected to the outgoing to the inlet side discharge line, in which a further throttle device and downstream of the further throttle device is arranged in the direction of the inlet side shut-off valve.
  • a connection of the Control pressure of the lowering brake valve leading pilot control line can be achieved with the inlet side of the hydraulic cylinder.
  • the pressure present in the feed side is higher than the control pressure of the lowering brake valve present in the pilot line so that the check valve in the discharge line is closed and the lowering brake valve arranged in the discharge side is opened by the hydraulic control pressure of the control valve into the flow position.
  • the pressure in the inlet side decreases. If the pressure in the inlet side drops below the value of the control pressure, the check valve in the outlet line opens, so that the control pressure of the drain-side lowering brake valve is reduced via the two throttle devices and the open check valve to the inlet side and possibly relieved.
  • the arranged in the discharge side lowering brake valve is acted upon in the direction of the blocking position and activated in its function as a lowering brake to regulate by reducing the cross-section of the discharge side, the speed of the hydraulic cylinder acting negative load.
  • a generic control valve device only a modified signal guidance for controlling the arranged in the load lines Senkbremsventile, so that the inventive control of Senkbremsventile makes no changes to the control valve or a housing of the control valve and a generic control valve device with the inventive control of Senkbremsventile to simple It can be retrofitted.
  • the throttle devices which allow the pressure reduction of the control pressure, which actuates the lowering brake valve to the inlet side, are expediently designed as diaphragms or nozzles.
  • the control valve device 1 comprises a throttling in intermediate positions, designed as a directional valve control valve 2, which is connected to a delivery line 3 in the open Circulation-operated pump 4 and a guided to a container 5 tank line 6 is connected.
  • the control valve 2 controls the direction of movement and the speed of movement of a double-acting hydraulic cylinder 7, wherein the control valve 2 is connected by means of a first consumer line 8a with a first pressure chamber 7a of the hydraulic cylinder 7 and by means of a second consumer line 8b with a second pressure chamber 7b of the hydraulic cylinder 7.
  • the control valve 2 has a blocking position 2 a formed as a neutral position, in which the connection of the consumer lines 8 a, 8 b to the delivery line 3 and the container line 6 is shut off.
  • a first control position 2 b of the control valve 2 the first consumer line 8 a is connected to the delivery line 3 of the pump 4 and the second consumer line 8 b is connected to the container line 6 guided to the container 5.
  • the first consumer line 8a thus forms the inlet side of the hydraulic cylinder 7
  • the second consumer line 8b forms the outlet side of the hydraulic cylinder 7.
  • the second consumer line 8b is connected to the delivery line 3 of the pump 4 and the first Consumer line 8a connected to the guided to the container 5 container 6 line.
  • the second consumer line 8b thus forms the inlet side of the hydraulic cylinder 7 and the first consumer line 8a forms the outlet side of the hydraulic cylinder 7.
  • the control valve 2 is acted upon by spring devices 9a, 9b in the locking position 2a designed as a middle position.
  • the control valve 2 is hydraulically actuated.
  • a control pressure line 10 a leading to a hydraulic control pressure p A is led to a corresponding control surface of the control valve 2.
  • a control pressure line 10b leading to a hydraulic control pressure p B is guided to a corresponding control surface of the control valve 2.
  • the control valve device 1 further comprises in each case a seat-tight lowering brake valve 15a, 15b, which is arranged in the corresponding consumer line 8a, 8b.
  • the lowering brake valves 15a, 15b have the function of a seat-tight load-holding valve Leakage-free shut-off of the hydraulic cylinder 7 and a lowering brake for controlling the discharge side of the hydraulic cylinder 7.
  • the lowering brake valves 15a, 15b each have a leak-tight or seat-tight blocking position 16a or 16b, in which a blocking valve 17a or 17b, for example a check valve, which opens in the flow direction to the hydraulic cylinder 7 is arranged.
  • the lowering brake valves 15a, 15b have a flow position 18a or 18b.
  • the lowering brake valves 15a, 15b are designed as valves throttling in intermediate positions.
  • the lowering brake valves 15a, 15b are each actuated by means of a spring device 19a or 19b in the direction of the blocking position 16a or 16b.
  • the present invention which is arranged at a corresponding actuation of the control valve 2 in the respective outlet side lowering brake valve 17b or 17a operable 15b and 15a, respectively p from the hydraulic control pressure A and p B of the control valve 2 in the direction of the throughflow position, the control valve 2 in the direction of a Control position 2b and 2c operated in which the of the hydraulic control pressure p A and p B in the flow position 18b and 18a controlled load-holding valve 15b and 15a is arranged in the connected to the container 6 consumer line 8b and 8a.
  • a pilot control line 20a is provided on the lowering brake valve 15b which is guided by a corresponding control surface of the lowering brake valve 15b in the direction of the flow position 18b to the control pressure line 10a leading the hydraulic control pressure p A of the control valve 2, which controls the control valve 2 in the direction of the first control position 2b actuated.
  • a first throttle device 21a is arranged in the pilot control line 20a of the lowering brake valve 15b branching off from the control pressure line 10a.
  • a discharge line 22a Connected to the pilot control line 20a, between the throttle device 21a and the control surface of the lowering brake valve 15b, is a discharge line 22a, which is connected to the consumer line 8a forming the inlet side.
  • a second throttle device 23a and downstream of the throttle device 23a in the direction of the consumer line 8a opening check valve 24a for example, a spring-loaded check valve arranged.
  • a pilot control line 20b is correspondingly provided on the lowering brake valve 15a which is guided by a corresponding control surface of the lowering brake valve 15a in the direction of the flow position 18a to the control pressure line 10b leading the hydraulic control pressure p B of the control valve 2, which controls the control valve 2 in the direction of the second control position 2c pressed.
  • a first throttle device 21b is arranged in the pilot control line 20b of the lowering brake valve 15a branching off from the control pressure line 10b.
  • a discharge line 22b Connected to the pilot control line 20b, between the throttle device 21b and the control surface of the lowering brake valve 15a, is a discharge line 22b, which is connected to the consumer line 8b forming the inlet side.
  • a second throttle device 23b and downstream of the throttle device 23b in the direction of the consumer line 8b opening check valve 24b for example, a spring-loaded check valve arranged.
  • the pressure control valve 30a is arranged in a connecting line 31a which is connected to the consumer line 8a between the hydraulic cylinder 7 and the lowering brake valve 15a and is guided to the tank line 6
  • the pressure limiting valve 30b is arranged in a connecting line 31b, which is connected to the consumer line 8b between the hydraulic cylinder 7 and the lowering brake valve 15b and is guided to the container line 6.
  • the control valve device 1 operates as follows.
  • the control valve 2 Upon actuation of the control valve 2 by a pending in the control pressure line 10a hydraulic control pressure p A , the control valve 2 is actuated in the direction of the first control position 2b, in which the first consumer line 8a, the inlet side and the second consumer line 8b forms the discharge side of the hydraulic cylinder 7. Pressure medium from the pump 4 flows via the control valve 2 into the first consumer line 8a and opening the check valve 17a of the located in the blocking position 16a, arranged in the inlet side Senkbremsventils 15a in the pressure chamber 7a of the hydraulic cylinder.
  • the lowering brake valve 15b arranged in the consumer line 8b forming the outlet side is separated from the hydraulic line by the pilot control line 20a branched off from the control pressure line 10a Actuating pressure p A of the control valve 2 is actuated in the flow position 18b, so that pressure fluid from the pressure chamber 7b of the hydraulic cylinder 7 and the lowered in the flow position 18b lowering brake valve 15b via the consumer line 8b to the control valve 2 and the container 5 can flow.
  • the control pressure p A that actuates the load-holding valve 15 b arranged in the discharge side is likewise in the discharge line 22 a. As long as the delivery pressure prevailing in the inlet-side consumer line 8a exceeds the activation pressure p A , the check valve 24a of the discharge line 22a is in the blocking position.
  • the pressure in the upstream consumer line 8a decreases. If the inlet-side pressure drops below the control pressure p A , the shut-off valve 24a opens in the drain line 22a, so that a pressure reduction of the control pressure present in the pilot control line 20a and the drain-side load-holding valve 15b in the flow-through position 18b takes place. Due to the pressure reduction in the pilot control line 20a, the drain-side lowering brake valve 15b is actuated by the spring device 19b in the direction of the blocking position 16b, whereby the lowering brake valve 15b controls the speed of movement of the hydraulic cylinder 7 acted upon by a negative load. The arranged in the downstream side lowering brake valve 15b is thus controlled by the control pressure p A of the control valve 2 that is varied via the drain pipe 22a in response to the pending in the inflow-side consumer line 8a inlet pressure and influenced.
  • the consumer line 8b the inlet side and the consumer line 8a forms the discharge side of the hydraulic cylinder 7, the arranged in the discharge side 8a lowering brake valve 15a of the control pressure p B. of the control valve 2 is acted upon in the direction of the flow position 18a, wherein the control pressure of the lowering brake valve 15a is influenced and varied via the drain line 22b of the present in the inlet-side consumer line 8b inlet pressure.
  • the lowering brake valve arranged in the corresponding outlet-side consumer line 8a or 8b is thus activated as a lowering brake for regulating the movement speed of the hydraulic cylinder 7 when a negative load occurs, that the hydraulic control pressure p B or p A of the drain-side lowering brake valve 15a or 15b via the throttle position combination 21b, 23b and 21a, 23a and the check valves 24b and 24a is reduced to the respective inlet side.
  • the throttle devices 21a, 21b, 23a, 23b may be formed as diaphragms or nozzles.
  • the control valve device 1 allows a leak-free shut-off of the hydraulic cylinder 7 and thus a leak-free load hold by the in the locking position 17a, 17b seat-tight lowering brake valves 15a, 15b.
  • p B the control pressure
  • p A of the control valve 2 a stable control behavior is achieved with low vibrations.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft eine hydraulische Steuerventileinrichtung zur Steuerung eines doppeltwirkenden Hydraulikzylinders mit einem in Zwischenstellungen drosselnden Steuerventil, das mit einer Förderleitung einer Pumpe, einer zu einem Behälter geführten Behälterleitung und zu dem Hydraulikzylinder geführten Verbraucherleitungen in Verbindung steht, wobei das Steuerventil von jeweils einem hydraulischen Ansteuerdruck in Richtung einer Steuerstellung betätigt ist, in der eine Verbraucherleitung eine mit der Förderleitung verbundene Zulaufseite und die weitere Verbraucherleitung eine mit dem Behälter verbundene Ablaufseite bildet und wobei in den Verbraucherleitungen jeweils ein sitzdichtes Senkbremsventil zur leckölfreien Absperrung des Hydraulikzylinders angeordnet ist, das eine leckagedichte Sperrstellung und eine Durchflussstellung aufweist wobei das in der Ablaufseite angeordnete sitzdichte Senkbremsventil von dem Ansteuerdruck des Steuerventils in Richtung der Durchflussstellung betätigbar ist.The invention relates to a hydraulic control valve device for controlling a double-acting hydraulic cylinder with a throttling in intermediate positions control valve, which communicates with a delivery line of a pump, guided to a container tank line and to the hydraulic cylinder consumer lines connected, wherein the control valve of a respective hydraulic control pressure in Direction of a control position is actuated, in which a consumer line connected to the feed line inlet side and the other consumer line forms a drain side connected to the container and wherein in the consumer lines each a seat-tight lowering brake valve is arranged to leak oil-free barrier of the hydraulic cylinder, which is a leak-tight blocking position and a Flow position has wherein the arranged in the discharge side seat-tight lowering brake valve of the control pressure of the control valve in the direction of Durchste is operable.

Eine Steuerventileinrichtung mit einem Steuerventil und in den Verbraucherleitungen angeordneten sitzdichten Senkbremsventilen ist aus der
DE 102 24 731 A1 für die Steuerung eines Neigeantriebs bekannt. Die in der jeweiligen Ablaufseite des Hydraulikzylinders angeordneten Senkbremsventile, die auch als Overcenterventile bezeichnet werden, dienen zur Geschwindigkeitsregelung der Verbraucherbewegung beim Auftreten einer negativen Last, d.h. einer am Hydraulikzylinder ziehenden und die von dem Steuerventil angesteuerte Bewegung des Hydraulikzylinders unterstützenden Last, in dem die Ablaufseite des Verbrauchers gesteuert wird. Um weiterhin eine leckölfreie Absperrung des Hydraulikzylinders und eine Lasthaltung in der Sperrstellung zu erzielen, sind die Senkbremsventile mit einer leckagedichten Sperrstellung versehen. Die leckagedichten Senkbremsventile bilden somit kombinierte Lasthalte- und Senkbremsventile.A control valve device with a control valve and arranged in the consumer lines seat-tight lowering brake valves is from the
DE 102 24 731 A1 known for the control of a tilt drive. The arranged in the respective outlet side of the hydraulic cylinder Senkbremsventile, which are also referred to as overcenter valves, are used for speed control of the consumer movement in the occurrence of a negative load, ie pulling on the hydraulic cylinder and the controlled by the control valve movement of the hydraulic cylinder supporting load in which the outflow side of the Consumer is controlled. In order to continue to achieve a leak-free shut-off of the hydraulic cylinder and a load holding in the blocking position, the lowering brake valves are provided with a leak-tight blocking position. The leak-proof lowering brake valves thus form combined load-holding and lowering brake valves.

Das in der ablaufseitigen Verbraucherleitung des Hydraulikzylinders angeordnete Senkbremsventil muss bei einer entsprechenden Betätigung des Steuerventils in eine Steuerstellung, in der die mit dem Senkbremsventil versehene Verbraucherleitung mit dem Behälter verbunden ist und die Ablaufseite bildet in die Durchflussstellung aufgesteuert werden.The arranged in the drain-side consumer line of the hydraulic cylinder lowering brake valve must be at a corresponding actuation of the control valve in a control position in which provided with the lowering brake consumer line with the container is connected and the drain side forms are turned on in the flow position.

Bei der aus der DE 102 24 731 A1 bekannten Steuerventileinrichtung ist das in der Ablaufseite angeordnete leckagedichte Senkbremsventil bei einer entsprechenden Betätigung des Steuerventils von dem in der Zulaufseite des Hydraulikzylinders anstehenden Zulaufdruck in Richtung der Durchflussstellung aufgesteuert. Hierzu ist an die Zulaufseite des Hydraulikzylinders eine Vorsteuerleitung angeordnet, die zu einer zu einem Behälter geführten Behälterleitung geführt ist, wobei in der Vorsteuerleitung zwei Drosseleinrichtungen angeordnet ist, zwischen denen der Ansteuerdruck zum Aufsteuern des in der Ablaufseite angeordneten Senkbremsventils erzeugt und abgegriffen wird.At the time of the DE 102 24 731 A1 known control valve device is arranged in the discharge side leak-proof lowering brake valve in a corresponding actuation of the control valve controlled by the pending in the inlet side of the hydraulic cylinder inlet pressure in the direction of the flow position. For this purpose, a pilot line is arranged on the inlet side of the hydraulic cylinder, which is guided to a vessel to a container line, wherein in the pilot line two throttle means is arranged between which the drive pressure for controlling the arranged in the discharge side lowering brake valve is generated and tapped.

Bei bekannten Steuerventileinrichtung, bei denen das in der Ablaufseite angeordnete Senkbremsventil von dem in der Zulaufseite anstehenden Druck aufgesteuert wird, kommt es jedoch zu Schwingungsproblemen, die es zeitweise unmöglich machen, eine am Hydraulikzylinder angreifende negative Last, beispielsweise eine ziehende Last, zu beherrschen. Um diese Schwingungen zu beherrschen, ist ein hoher Abstimmungsaufwand an dem Lasthalteventil und dessen Ansteuerung durch die Drosseleinrichtungen erforderlich. Aufgrund der großen Bandbreite der Lastfälle kann jedoch kein allzeit stabiler Zustand erreicht werden, sondern in der Regel nur eine Kompromisslösung. Zudem führt die Verbindung der Zulaufseite des Hydraulikzylinders zu dem Behälter über die Vorsteuerleitungen der Senkbremsventile und die darin angeordneten Drosseleinrichtungen zu Leistungsverlusten, die den Wirkungsgrad verringern.In known control valve device, in which the arranged in the discharge side lowering brake valve is controlled by the pending in the inlet side pressure, but it comes to vibration problems that make it temporarily impossible to dominate an attacking the hydraulic cylinder negative load, such as a pulling load. In order to control these oscillations, a high coordination effort on the load-holding valve and its control by the throttle devices is required. Due to the large bandwidth of the load cases, however, an always stable state can not be achieved, but as a rule only a compromise solution. In addition, the connection of the inlet side of the hydraulic cylinder to the container via the pilot lines of the lowering brake valves and the throttle devices arranged therein leads to power losses that reduce the efficiency.

Eine gattungsgemäße Steuerventileinrichtung ist aus der Figur 2 der JP S64 24163 U bekannt.A generic control valve device is shown in FIG JP S64 24163 U known.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Steuerventileinrichtung der eingangs genannten Gattung zur Verfügung zu stellen, bei der ein stabiles Regelverhalten erzielt wird und Leistungsverluste bei der Ansteuerung der Senkbremsventile vermieden werden.The present invention has for its object to provide a control valve device of the type mentioned available, in which a stable control behavior is achieved and power losses are avoided in the control of the lowering brake valves.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass bei einer am Hydraulikzylinder angreifenden negativen Last der das Senkbremsventil in die Durchflussstellung beaufschlagenden Ansteuerdruck in Abhängigkeit von dem in der Zulaufseite des Hydraulikzylinders anstehenden Zulaufdruck beeinflussbar, wobei eine den Ansteuerdruck führende Vorsteuerleitung des Senkbremsventil mittels einer Ablassleitung, in der ein Sperrventil angeordnet ist, mit der zulaufseitigen Verbraucherleitung verbunden ist, wobei bei einem Absinken des zulaufseitigen Druckes in der zulaufseitigen Verbraucherleitung unter den Ansteuerdruck das Sperrventil in der Ablassleitung öffnet und ein Druckabbau des in der Vorsteuerleitung anstehenden und das ablaufseitige Senkbremsventil in die Durchflussstellung aufsteuernden Ansteuerdruckes stattfindet. Durch die Betätigung des in der Ablaufseite angeordneten Senkbremsventils durch den das Steuerventil betätigenden hydraulischen Ansteuerdruck, durch den das Steuerventil in eine die Zulaufseite mit der Pumpe und die Ablaufseite mit dem Behälter verbindende Steuerstellung betätigt wird, können gegenüber einer Aufsteuerung des ablaufseitigen Senkbremsventils durch den zulaufseitigen Druck Schwingungsprobleme vermieden werden und ein stabiles Regelverhalten des Senkbremsventils erzielt werden. Zudem verursacht die erfindungsgemäße Betätigung der in der Ablaufseite angeordneten Senkbremsventile durch den das Steuerventil betätigenden hydraulischen Ansteuerdruck keine Leistungsverluste durch eine Verbindung der Zulaufseite mit dem Behälter, so dass mit der erfindungsgemäßen Betätigung der Senkbremseventile durch den Steuerdruck der Steuerventile weiterhin ein verbesserter Wirkungsgrad erzielt wird.This object is achieved in that at a hydraulic cylinder acting on the negative load of the Senkbremsventil acting in the flow position control pressure in response to the pending in the inlet side of the hydraulic cylinder inlet pressure influenced, wherein the control pressure leading pilot line of the Senkbremsventil means of a drain line in the a check valve is arranged, is connected to the inlet-side consumer line, wherein at a decrease in the inlet-side pressure in the inlet side consumer line under the control pressure opens the check valve in the drain line and a pressure reduction of the pending in the pilot line and the drain-side lowering brake valve aufsteuernden in the flow control pressure takes place , By actuating the lowering brake valve arranged in the outflow side by the hydraulic control pressure actuating the control valve, by means of which the control valve is actuated into a control position connecting the inlet side with the pump and the outlet side with the container, the upstream side pressure can be controlled by a control of the outflow-side lowering brake valve Vibration problems are avoided and a stable control behavior of the lowering brake valve can be achieved. In addition, the inventive actuation of the arranged in the discharge side lowering brake valves caused by the control valve actuated hydraulic control pressure no power losses by connecting the inlet side with the container, so that with the inventive actuation of Senkbremseventile by the control pressure of the control valves further improved efficiency is achieved.

Das in der Ablaufseite angeordnete sitzdichte Senkbremsventil wird durch den Ansteuerdruck des Steuerventils in Richtung der Durchflussstellung beaufschlagt und somit von dem Ansteuerdruck des Steuerventils geregelt. Bei einer am Hydraulikzylinder angreifenden negativen Last wird der das Senkbremsventil in die Durchflussstellung aufsteuernde Ansteuerdruck in Abhängigkeit von dem Zulaufdruck des Hydraulikdrucks beeinflusst und variiert. Hierdurch wird auf einfache Weise erzielt, dass bei einer am Hydraulikzylinder angreifenden negativen Last der Ansteuerdruck des ablaufseitigen Senkbremsventils verringert werden kann, so dass das in der Ablaufseite angeordnete Senkbremsventil in Richtung der Sperrstellung beaufschlagt wird, um durch eine Verringerung des Querschnitts der Ablaufseite die Geschwindigkeit der am Hydraulikzylinder angreifenden Last zu regeln.The arranged in the discharge side seat-tight lowering brake valve is acted upon by the control pressure of the control valve in the direction of the flow position and thus controlled by the control pressure of the control valve. In the case of a negative load acting on the hydraulic cylinder, the control pressure which activates the lowering brake valve into the flow position is influenced and varied as a function of the inlet pressure of the hydraulic pressure. As a result, it is achieved in a simple manner that when a negative load acting on the hydraulic cylinder, the control pressure of the drain-side lowering brake valve can be reduced, so that the arranged in the drain side lowering brake valve is acted upon in the direction of the blocking position, by reducing the cross-section of the discharge side, the speed of To regulate load acting on the hydraulic cylinder.

Hinsichtlich eines einfachen Aufbaus ergeben sich Vorteile, wenn gemäß einer vorteilhafte Ausgestaltungsform der Erfindung die zur Betätigung des Senkbremsventils vorgesehene Vorsteuerleitung von einer in Richtung einer Durchflussstellung wirkenden Steuerfläche des Senkbremsventils zu einer den Ansteuerdruck des Steuerventils führenden Steuerdruckleitung geführt ist, wobei in der Vorsteuerleitung eine Drosseleinrichtung angeordnet ist und die Vorsteuerleitung zwischen der Drosseleinrichtung und dem Senkbremsventil mit der zu der Zulaufseite geführten Ablassleitung verbunden ist, in der eine weitere Drosseleinrichtung und stromab der weiteren Drosseleinrichtung das in Richtung zu der Zulaufseite öffnende Sperrventil angeordnet ist. Mit der Ablassleitung kann eine Verbindung der den Ansteuerdruck des Senkbremsventils führenden Vorsteuerleitung mit der Zulaufseite des Hydraulikzylinders erzielt werden. Im normalen Betrieb ist der in der Zulaufseite anstehende Druck höher als der in der Vorsteuerleitung anstehende Ansteuerdruck des Senkbremsventils, so dass das Rückschlagventil in der Ablassleitung geschlossen ist und das in der Ablaufseite angeordnete Senkbremsventils von dem hydraulischen Ansteuerdruck des Steuerventils in die Durchflussstellung aufgesteuert wird. Bei einer am Hydraulikzylinder angreifenden negativen Last sinkt der Druck in der Zulaufseite. Sinkt der Druck in der Zulaufseite unter den Wert des Ansteuerdrucks, öffnet das Rückschlagventil in der Ablassleitung, so dass der Ansteuerdruck des ablaufseitigen Senkbremsventils über die beiden Drosseleinrichtungen und das geöffnete Sperrventil zu der Zulaufseite abgebaut und gegebenenfalls entlastet wird. Dadurch wird das in der Ablaufseite angeordnete Senkbremsventils in Richtung der Sperrstellung beaufschlagt und in seiner Funktion als Senkbremse aktiviert, um durch eine Verringerung des Querschnitts der Ablaufseite die Geschwindigkeit der am Hydraulikzylinder angreifenden negativen Last zu regeln. Gegenüber einer gattungsgemäßen Steuerventileinrichtung ergibt sich lediglich eine geänderte Signalführung zur Steuerung der in den Verbraucherleitungen angeordneten Senkbremsventile, so dass die erfindungsgemäße Ansteuerung der Senkbremsventile keine Veränderungen an dem Steuerventil oder einem Gehäuse des Steuerventils erforderlich macht und eine gattungsgemäße Steuerventileinrichtung mit der erfindungsgemäßen Ansteuerung der Senkbremsventile auf einfache Weise nachrüstbar ist.With regard to a simple construction, there are advantages if, in accordance with an advantageous embodiment of the invention, the pilot control line provided for actuating the lowering brake valve is guided by a control surface of the lowering brake valve which acts in the direction of a flow position to a control pressure line leading to the control pressure of the control valve, wherein a throttle device is arranged in the pilot control line is and the pilot line between the throttle device and the lowering brake valve is connected to the outgoing to the inlet side discharge line, in which a further throttle device and downstream of the further throttle device is arranged in the direction of the inlet side shut-off valve. With the drain line, a connection of the Control pressure of the lowering brake valve leading pilot control line can be achieved with the inlet side of the hydraulic cylinder. In normal operation, the pressure present in the feed side is higher than the control pressure of the lowering brake valve present in the pilot line so that the check valve in the discharge line is closed and the lowering brake valve arranged in the discharge side is opened by the hydraulic control pressure of the control valve into the flow position. When a negative load acting on the hydraulic cylinder, the pressure in the inlet side decreases. If the pressure in the inlet side drops below the value of the control pressure, the check valve in the outlet line opens, so that the control pressure of the drain-side lowering brake valve is reduced via the two throttle devices and the open check valve to the inlet side and possibly relieved. Characterized the arranged in the discharge side lowering brake valve is acted upon in the direction of the blocking position and activated in its function as a lowering brake to regulate by reducing the cross-section of the discharge side, the speed of the hydraulic cylinder acting negative load. Compared with a generic control valve device, only a modified signal guidance for controlling the arranged in the load lines Senkbremsventile, so that the inventive control of Senkbremsventile makes no changes to the control valve or a housing of the control valve and a generic control valve device with the inventive control of Senkbremsventile to simple It can be retrofitted.

Die Drosseleinrichtungen, die den Druckabbau des Ansteuerdrucks, der das Senkbremsventil betätigt, zur Zulaufseite ermöglichen, sind zweckmäßigerweise als Blenden oder Düsen ausgebildet.The throttle devices, which allow the pressure reduction of the control pressure, which actuates the lowering brake valve to the inlet side, are expediently designed as diaphragms or nozzles.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in der schematischen Figur dargestellten Ausführungsbeispiels näher erläutert.Further advantages and details of the invention will be explained in more detail with reference to the embodiment shown in the schematic figure.

In der Figur ist ein Schaltpan eines hydrostatischen Antriebssystems mit einer erfindungsgemäßen Steuerventileinrichtung 1 dargestellt.In the figure, a Schaltpan a hydrostatic drive system with a control valve device 1 according to the invention is shown.

Die Steuerventileinrichtung 1 umfasst ein in Zwischenstellungen drosselndes, als Wegeventil ausgebildetes Steuerventil 2, das an eine Förderleitung 3 einer im offenen Kreislauf betriebenen Pumpe 4 und eine zu einem Behälter 5 geführte Behälterleitung 6 angeschlossen ist.The control valve device 1 comprises a throttling in intermediate positions, designed as a directional valve control valve 2, which is connected to a delivery line 3 in the open Circulation-operated pump 4 and a guided to a container 5 tank line 6 is connected.

Das Steuerventil 2 steuert die Bewegungsrichtung und die Bewegungsgeschwindigkeit eines doppeltwirkenden Hydraulikzylinders 7, wobei das Steuerventil 2 mittels einer ersten Verbraucherleitung 8a mit einem ersten Druckraum 7a des Hydraulikzylinders 7 und mittels einer zweiten Verbraucherleitung 8b mit einem zweiten Druckraum 7b des Hydraulikzylinder 7 in Verbindung steht.The control valve 2 controls the direction of movement and the speed of movement of a double-acting hydraulic cylinder 7, wherein the control valve 2 is connected by means of a first consumer line 8a with a first pressure chamber 7a of the hydraulic cylinder 7 and by means of a second consumer line 8b with a second pressure chamber 7b of the hydraulic cylinder 7.

Das Steuerventil 2 weist eine als Neutralstellung ausgebildete Sperrstellung 2a auf, in der die Verbindung der Verbraucherleitungen 8a, 8b mit der Förderleitung 3 und der Behälterleitung 6 abgesperrt ist. In einer ersten Steuerstellung 2b des Steuerventils 2 ist die erste Verbraucherleitung 8a mit der Förderleitung 3 der Pumpe 4 und die zweite Verbraucherleitung 8b mit der zu dem Behälter 5 geführten Behälterleitung 6 verbunden. In der ersten Steuerstellung 2b bildet somit die erste Verbraucherleitung 8a die Zulaufseite des Hydraulikzylinders 7 und die zweite Verbraucherleitung 8b die Ablaufseite des Hydraulikzylinders 7. In einer zweiten Steuerstellung 2c des Steuerventils 2 ist die zweite Verbraucherleitung 8b mit der Förderleitung 3 der Pumpe 4 und die erste Verbraucherleitung 8a mit der zu dem Behälter 5 geführten Behälterleitung 6 verbunden. In der zweiten Steuerstellung 2c bildet somit die zweite Verbraucherleitung 8b die Zulaufseite des Hydraulikzylinders 7 und die erste Verbraucherleitung 8a die Ablaufseite des Hydraulikzylinders 7.The control valve 2 has a blocking position 2 a formed as a neutral position, in which the connection of the consumer lines 8 a, 8 b to the delivery line 3 and the container line 6 is shut off. In a first control position 2 b of the control valve 2, the first consumer line 8 a is connected to the delivery line 3 of the pump 4 and the second consumer line 8 b is connected to the container line 6 guided to the container 5. In the first control position 2b, the first consumer line 8a thus forms the inlet side of the hydraulic cylinder 7 and the second consumer line 8b forms the outlet side of the hydraulic cylinder 7. In a second control position 2c of the control valve 2, the second consumer line 8b is connected to the delivery line 3 of the pump 4 and the first Consumer line 8a connected to the guided to the container 5 container 6 line. In the second control position 2c, the second consumer line 8b thus forms the inlet side of the hydraulic cylinder 7 and the first consumer line 8a forms the outlet side of the hydraulic cylinder 7.

Das Steuerventil 2 ist von Federeinrichtungen 9a, 9b in die als Mittelstellung ausgebildete Sperrstellung 2a beaufschlagt. Das Steuerventil 2 ist hydraulisch betätigbar. Zur Betätigung des Steuerventils 2 in Richtung der ersten Steuerstellung 2b ist eine einen hydraulischen Ansteuerdruck pA führende Steuerdruckleitung 10a an eine entsprechende Steuerfläche des Steuerventils 2 geführt. Entsprechend ist zur Betätigung des Steuerventils 2 in Richtung der zweiten Steuerstellung 2c ist eine einen hydraulischen Ansteuerdruck pB führende Steuerdruckleitung 10b an eine entsprechende Steuerfläche des Steuerventils 2 geführt.The control valve 2 is acted upon by spring devices 9a, 9b in the locking position 2a designed as a middle position. The control valve 2 is hydraulically actuated. For actuating the control valve 2 in the direction of the first control position 2 b, a control pressure line 10 a leading to a hydraulic control pressure p A is led to a corresponding control surface of the control valve 2. Accordingly, for actuating the control valve 2 in the direction of the second control position 2c, a control pressure line 10b leading to a hydraulic control pressure p B is guided to a corresponding control surface of the control valve 2.

Die Steuerventileinrichtung 1 umfasst weiterhin jeweils ein sitzdichtes Senkbremsventil 15a, 15b, das in der entsprechenden Verbraucherleitung 8a, 8b angeordnet ist. Die Senkbremsventile 15a, 15b weisen die Funktion eines sitzdichten Lasthalteventils zur leckölfreien Absperrung des Hydraulikzylinders 7 und einer Senkbremse zur Steuerung der Ablaufseite des Hydraulikzylinders 7 auf. Die Senkbremsventile 15a, 15b weisen jeweils eine leckagedichte bzw. sitzdichte Sperrstellung 16a bzw. 16b auf, in der ein in Durchflussrichtung zu dem Hydraulikzylinder 7 öffnendes Sperrventil 17a bzw. 17b, beispielsweise ein Rückschlagventil, angeordnet ist. Weiterhin weisen die Senkbremsventile 15a, 15b eine Durchflussstellung 18a bzw. 18b auf. Die Senkbremsventile 15a, 15b sind als in Zwischenstellungen drosselnde Ventile ausgebildet.The control valve device 1 further comprises in each case a seat-tight lowering brake valve 15a, 15b, which is arranged in the corresponding consumer line 8a, 8b. The lowering brake valves 15a, 15b have the function of a seat-tight load-holding valve Leakage-free shut-off of the hydraulic cylinder 7 and a lowering brake for controlling the discharge side of the hydraulic cylinder 7. The lowering brake valves 15a, 15b each have a leak-tight or seat-tight blocking position 16a or 16b, in which a blocking valve 17a or 17b, for example a check valve, which opens in the flow direction to the hydraulic cylinder 7 is arranged. Furthermore, the lowering brake valves 15a, 15b have a flow position 18a or 18b. The lowering brake valves 15a, 15b are designed as valves throttling in intermediate positions.

Die Senkbremsventile 15a, 15b sind jeweils mittels einer Federeinrichtung 19a bzw. 19b in Richtung der Sperrstellung 16a bzw. 16b betätigt.The lowering brake valves 15a, 15b are each actuated by means of a spring device 19a or 19b in the direction of the blocking position 16a or 16b.

Erfindungsgemäß ist das bei einer entsprechenden Betätigung des Steuerventils 2 in der jeweiligen Ablaufseite angeordnete Senkbremsventil 15b bzw. 15a von dem hydraulischen Ansteuerdruck pA bzw. pB des Steuerventils 2 in Richtung der Durchflussstellung 17b bzw. 17a betätigbar, der das Steuerventil 2 in Richtung einer Steuerstellung 2b bzw. 2c betätigt, in der das von dem hydraulischen Ansteuerdruck pA bzw. pB in die Durchflussstellung 18b bzw. 18a aufgesteuerte Lasthalteventil 15b bzw. 15a in der mit dem Behälter 6 verbundenen Verbraucherleitung 8b bzw. 8a angeordnet ist.The present invention, which is arranged at a corresponding actuation of the control valve 2 in the respective outlet side lowering brake valve 17b or 17a operable 15b and 15a, respectively p from the hydraulic control pressure A and p B of the control valve 2 in the direction of the throughflow position, the control valve 2 in the direction of a Control position 2b and 2c operated in which the of the hydraulic control pressure p A and p B in the flow position 18b and 18a controlled load-holding valve 15b and 15a is arranged in the connected to the container 6 consumer line 8b and 8a.

Hierzu ist an dem Senkbremsventil 15b eine Vorsteuerleitung 20a vorgesehen, die von einer entsprechenden, in Richtung der Durchflussstellung 18b wirkenden Steuerfläche des Senkbremsventils 15b zu der den hydraulischen Ansteuerdruck pA des Steuerventils 2 führenden Steuerdruckleitung 10a geführt, der das Steuerventil 2 in Richtung der ersten Steuerstellung 2b betätigt. In der von der Steuerdruckleitung 10a abzweigenden Vorsteuerleitung 20a des Senkbremsventils 15b ist eine erste Drosseleinrichtung 21a angeordnet. An die Vorsteuerleitung 20a ist zwischen der Drosseleinrichtung 21a und der Steuerfläche des Senkbremsventils 15b eine Ablassleitung 22a angeschlossen, die an die die Zulaufseite bildenden Verbraucherleitung 8a angeschlossen ist. In der Ablassleitung 22a ist eine zweite Drosseleinrichtung 23a und stromab der Drosseleinrichtung 23a ein in Richtung zu der Verbraucherleitung 8a öffnendes Sperrventil 24a, beispielsweise ein federbelastetes Rückschlagventil, angeordnet.For this purpose, a pilot control line 20a is provided on the lowering brake valve 15b which is guided by a corresponding control surface of the lowering brake valve 15b in the direction of the flow position 18b to the control pressure line 10a leading the hydraulic control pressure p A of the control valve 2, which controls the control valve 2 in the direction of the first control position 2b actuated. A first throttle device 21a is arranged in the pilot control line 20a of the lowering brake valve 15b branching off from the control pressure line 10a. Connected to the pilot control line 20a, between the throttle device 21a and the control surface of the lowering brake valve 15b, is a discharge line 22a, which is connected to the consumer line 8a forming the inlet side. In the discharge line 22a is a second throttle device 23a and downstream of the throttle device 23a in the direction of the consumer line 8a opening check valve 24a, for example, a spring-loaded check valve arranged.

An dem Senkbremsventil 15a ist entsprechend eine Vorsteuerleitung 20b vorgesehen, die von einer entsprechenden, in Richtung der Durchflussstellung 18a wirkenden Steuerfläche des Senkbremsventils 15a zu der den hydraulischen Ansteuerdruck pB des Steuerventils 2 führenden Steuerdruckleitung 10b geführt, der das Steuerventil 2 in Richtung der zweiten Steuerstellung 2c betätigt. In der von der Steuerdruckleitung 10b abzweigenden Vorsteuerleitung 20b des Senkbremsventils 15a ist eine erste Drosseleinrichtung 21b angeordnet. An die Vorsteuerleitung 20b ist zwischen der Drosseleinrichtung 21b und der Steuerfläche des Senkbremsventils 15a eine Ablassleitung 22b angeschlossen, die an die die Zulaufseite bildenden Verbraucherleitung 8b angeschlossen ist. In der Ablassleitung 22b ist eine zweite Drosseleinrichtung 23b und stromab der Drosseleinrichtung 23b ein in Richtung zu der Verbraucherleitung 8b öffnendes Sperrventil 24b, beispielsweise ein federbelastetes Rückschlagventil, angeordnet.A pilot control line 20b is correspondingly provided on the lowering brake valve 15a which is guided by a corresponding control surface of the lowering brake valve 15a in the direction of the flow position 18a to the control pressure line 10b leading the hydraulic control pressure p B of the control valve 2, which controls the control valve 2 in the direction of the second control position 2c pressed. A first throttle device 21b is arranged in the pilot control line 20b of the lowering brake valve 15a branching off from the control pressure line 10b. Connected to the pilot control line 20b, between the throttle device 21b and the control surface of the lowering brake valve 15a, is a discharge line 22b, which is connected to the consumer line 8b forming the inlet side. In the discharge line 22b is a second throttle device 23b and downstream of the throttle device 23b in the direction of the consumer line 8b opening check valve 24b, for example, a spring-loaded check valve arranged.

Die Steuerventileinrichtung 1 umfasst zur Absicherung des Hydraulikzylinders 7 als Druckbegrenzungsventils ausgebildete Druckbegrenzungseinrichtungen 30a, 30b, wobei das Druckbegrenzungsventil 30a in einer Verbindungsleitung 31a angeordnet ist, die an die Verbraucherleitung 8a zwischen dem Hydraulikzylinder 7 und dem Senkbremsventil 15a angeschlossen ist und zu der Behälterleitung 6 geführt ist. Entsprechend das Druckbegrenzungsventil 30b in einer Verbindungsleitung 31b angeordnet ist, die an die Verbraucherleitung 8b zwischen dem Hydraulikzylinder 7 und dem Senkbremsventil 15b angeschlossen ist und zu der Behälterleitung 6 geführt ist.The pressure control valve 30a is arranged in a connecting line 31a which is connected to the consumer line 8a between the hydraulic cylinder 7 and the lowering brake valve 15a and is guided to the tank line 6 , Correspondingly, the pressure limiting valve 30b is arranged in a connecting line 31b, which is connected to the consumer line 8b between the hydraulic cylinder 7 and the lowering brake valve 15b and is guided to the container line 6.

Die erfindungsgemäße Steuerventileinrichtung 1 arbeitet wie folgt.The control valve device 1 according to the invention operates as follows.

Bei einer Betätigung des Steuerventils 2 durch einen in der Steuerdruckleitung 10a anstehenden hydraulischen Ansteuerdruck pA wird das Steuerventil 2 in Richtung der ersten Steuerstellung 2b betätigt, in der die erste Verbraucherleitung 8a die Zulaufseite und die zweite Verbraucherleitung 8b die Ablaufseite des Hydraulikzylinders 7 bildet. Druckmittel von der Pumpe 4 strömt über das Steuerventil 2 in die erste Verbraucherleitung 8a und unter Öffnung des Sperrventils 17a des in der Sperrstellung 16a befindlichen, in der Zulaufseite angeordneten Senkbremsventils 15a in den Druckraum 7a des Hydraulikzylinders. Das in der die Ablaufseite bildenden Verbraucherleitung 8b angeordnete Senkbremsventil 15b wird über die von der Steuerdruckleitung 10a abzweigende Vorsteuerleitung 20a von dem hydraulischen Ansteuerdruck pA des Steuerventils 2 in die Durchflussstellung 18b betätigt, so dass Druckmittel aus dem Druckraum 7b des Hydraulikzylinders 7 und das in die Durchflussstellung 18b aufgesteuerte Senkbremsventil 15b über die Verbraucherleitung 8b zu dem Steuerventil 2 und den Behälter 5 abströmen kann.Upon actuation of the control valve 2 by a pending in the control pressure line 10a hydraulic control pressure p A , the control valve 2 is actuated in the direction of the first control position 2b, in which the first consumer line 8a, the inlet side and the second consumer line 8b forms the discharge side of the hydraulic cylinder 7. Pressure medium from the pump 4 flows via the control valve 2 into the first consumer line 8a and opening the check valve 17a of the located in the blocking position 16a, arranged in the inlet side Senkbremsventils 15a in the pressure chamber 7a of the hydraulic cylinder. The lowering brake valve 15b arranged in the consumer line 8b forming the outlet side is separated from the hydraulic line by the pilot control line 20a branched off from the control pressure line 10a Actuating pressure p A of the control valve 2 is actuated in the flow position 18b, so that pressure fluid from the pressure chamber 7b of the hydraulic cylinder 7 and the lowered in the flow position 18b lowering brake valve 15b via the consumer line 8b to the control valve 2 and the container 5 can flow.

Der das in der Ablaufseite angeordnete Lasthalteventil 15b aufsteuernde Ansteuerdruck pA steht ebenfalls in der Ablassleitung 22a an. Solange der in der zulaufseitigen Verbraucherleitung 8a anstehende Förderdruck den Ansteuerdruck pA übersteigt, befindet sich das Sperrventil 24a der Ablassleitung 22a in der Sperrstellung.The control pressure p A that actuates the load-holding valve 15 b arranged in the discharge side is likewise in the discharge line 22 a. As long as the delivery pressure prevailing in the inlet-side consumer line 8a exceeds the activation pressure p A , the check valve 24a of the discharge line 22a is in the blocking position.

Tritt an dem Hydraulikzylinder 7 eine negative Last auf, die die Bewegung des Hydraulikzylinders 7 unterstützt, beispielsweise eine ziehenden Last, sinkt der Druck in der zulaufseitigen Verbraucherleitung 8a. Sinkt der zulaufseitige Druck unterhalb des Ansteuerdrucks pA öffnet das Sperrventil 24a in der Ablassleitung 22a, so dass ein Druckabbau des in der Vorsteuerleitung 20a anstehenden und das ablaufseitige Lasthalteventil 15b in die Durchflussstellung 18b aufsteuernden Ansteuerdrucks stattfindet. Durch den Druckabbau in der Vorsteuerleitung 20a wird das ablaufseitige Senkbremsventils 15b von der Federeinrichtung 19b in Richtung der Sperrstellung 16b betätigt, wodurch das Senkbremsventil 15b die Bewegungsgeschwindigkeit des von einer negativen Last beaufschlagten Hydraulikzylinders 7 regelt. Das in der Ablaufseite angeordnete Senkbremsventil 15b wird somit von dem Ansteuerdruck pA des Steuerventils 2 geregelt, der über die Ablassleitung 22a in Abhängigkeit von dem in der zulaufseitigen Verbraucherleitung 8a anstehenden Zulaufdruck variiert und beeinflusst wird.Occurs at the hydraulic cylinder 7 to a negative load that supports the movement of the hydraulic cylinder 7, for example, a pulling load, the pressure in the upstream consumer line 8a decreases. If the inlet-side pressure drops below the control pressure p A , the shut-off valve 24a opens in the drain line 22a, so that a pressure reduction of the control pressure present in the pilot control line 20a and the drain-side load-holding valve 15b in the flow-through position 18b takes place. Due to the pressure reduction in the pilot control line 20a, the drain-side lowering brake valve 15b is actuated by the spring device 19b in the direction of the blocking position 16b, whereby the lowering brake valve 15b controls the speed of movement of the hydraulic cylinder 7 acted upon by a negative load. The arranged in the downstream side lowering brake valve 15b is thus controlled by the control pressure p A of the control valve 2 that is varied via the drain pipe 22a in response to the pending in the inflow-side consumer line 8a inlet pressure and influenced.

Entsprechend wird bei einer Betätigung des Steuerventils 2 durch einen in der Steuerdruckleitung 10b anstehenden hydraulischen Ansteuerdruck pB, wobei die Verbraucherleitung 8b die Zulaufseite und die Verbraucherleitung 8a die Ablaufseite des Hydraulikzylinders 7 bildet, das in der Ablaufseite 8a angeordnete Senkbremsventil 15a von dem Ansteuerdruck pB des Steuerventils 2 in Richtung der Durchflussstellung 18a beaufschlagt, wobei der Ansteuerdruck des Senkbremsventils 15a über die Ablassleitung 22b von dem in der zulaufseitigen Verbraucherleitung 8b anstehenden Zulaufdruck beeinflusst und variiert wird.Accordingly, upon actuation of the control valve 2 by a pending in the control pressure line 10b hydraulic control pressure p B , the consumer line 8b the inlet side and the consumer line 8a forms the discharge side of the hydraulic cylinder 7, the arranged in the discharge side 8a lowering brake valve 15a of the control pressure p B. of the control valve 2 is acted upon in the direction of the flow position 18a, wherein the control pressure of the lowering brake valve 15a is influenced and varied via the drain line 22b of the present in the inlet-side consumer line 8b inlet pressure.

Bei der erfindungsgemäßen Ansteuerung der Senkbremsventile 15a, 15b wird somit das in der entsprechenden ablaufseitigen Verbraucherleitung 8a bzw. 8b angeordnete Senkbremsventil in der Funktion als Senkbremse zur Regelung der Bewegungsgeschwindigkeit des Hydraulikzylinders 7 beim Auftreten einer negativen Last dadurch aktiviert, dass der hydraulische Ansteuerdruck pB bzw. pA des ablaufseitigen Senkbremsventils 15a bzw. 15b über die Drosselstellenkombination 21b, 23b bzw. 21a, 23a und die Sperrventile 24b bzw. 24a zu der jeweiligen Zulaufseite abgebaut wird.In the control according to the invention of the lowering brake valves 15a, 15b, the lowering brake valve arranged in the corresponding outlet-side consumer line 8a or 8b is thus activated as a lowering brake for regulating the movement speed of the hydraulic cylinder 7 when a negative load occurs, that the hydraulic control pressure p B or p A of the drain-side lowering brake valve 15a or 15b via the throttle position combination 21b, 23b and 21a, 23a and the check valves 24b and 24a is reduced to the respective inlet side.

Die Drosseleinrichtungen 21a, 21b, 23a, 23b können als Blenden oder Düsen ausgebildet sein.The throttle devices 21a, 21b, 23a, 23b may be formed as diaphragms or nozzles.

Die erfindungsgemäße Steuerventileinrichtung 1 ermöglicht durch die in der Sperrstellung 17a, 17b sitzdichten Senkbremsventile 15a, 15b eine leckagefreie Absperrung des Hydraulikzylinders 7 und somit eine leckagefreie Lasthaltung. Durch die Ansteuerung des ablaufseitigen Senkbremsventils 15a, 15b mittels des Ansteuerdrucks pB, pA des Steuerventils 2 wird ein stabiles Regelverhalten mit geringen Schwingungen erzielt. Bei der erfindungsgemäßen Ansteuerung der ablaufseitigen Senkbremsventile 15a bzw. 15b treten zudem keine Leistungsverluste auf, so dass sich ein hoher Wirkungsgrad erzielen lässt.The control valve device 1 according to the invention allows a leak-free shut-off of the hydraulic cylinder 7 and thus a leak-free load hold by the in the locking position 17a, 17b seat-tight lowering brake valves 15a, 15b. By controlling the drain-side lowering brake valve 15a, 15b by means of the control pressure p B , p A of the control valve 2, a stable control behavior is achieved with low vibrations. In the control according to the invention of the drain-side lowering brake valves 15a and 15b, moreover, no power losses occur, so that a high degree of efficiency can be achieved.

Claims (3)

  1. Hydraulic control valve device (1) for controlling a double-acting hydraulic cylinder (7) having a control valve (2) which throttles in intermediate positions and is connected to a delivery line (3) of a pump (4), a container line (6) which is led to a container (5), and consumer lines (8a, 8b) which are led to the hydraulic cylinder (7), the control valve (2) being actuated by in each case one hydraulic actuating pressure (pA; pB) in the direction of a control position (2b; 2d), in which one consumer line (8a; 8b) forms an inlet side which is connected to the delivery line (3) and the further consumer line (8b; 8a) forms an outlet side which is connected to the container (5), and in each case one leakproof load-lowering brake valve (15a, 15b) for shutting off the hydraulic cylinder (7) without leakage oil being arranged in the consumer lines (8a, 8b), which load-lowering brake valve (15a, 15b) has a leakage-proof shut position (17a, 17b) and a throughflow position (18a, 18b), it being possible for the leakproof load-lowering brake valve (15b; 15a) which is arranged in the outlet side to be actuated in the direction of the throughflow position (18b; 18a) by the actuating pressure (pA; pB) of the control valve (2), characterized in that, in the case of a negative load which acts on the hydraulic cylinder (7), the actuating pressure (pA; pB) which loads the load-lowering brake valve (15b; 15a) into the throughflow position can be influenced in a manner which is dependent on the inlet pressure which prevails in the inlet side of the hydraulic cylinder (7), a pilot control line (20a; 20b) of the load-lowering brake valve (15a; 15b), which pilot control line (20a; 20b) conducts the actuating pressure (pA; pB), being connected to the inlet-side consumer line (8a; 8b) by means of a discharge line (22a; 22b), in which a shut-off valve (24a; 24b) is arranged, the shut-off valve (24a; 24b) in the discharge line (22a; 22b) opening if the inlet-side pressure in the inlet-side consumer line (8a; 8b) drops below the actuating pressure (pA; pB), and a pressure dissipation taking place of the actuating pressure which prevails in the pilot control line (20a; 20b) and opens the outlet-side load-lowering brake valve (15a; 15b) into the throughflow position (18a; 18b) in a controlled manner.
  2. Hydraulic control valve device according to Claim 1, characterized in that the pilot control line (20a; 20b) which is provided for actuating the load-lowering brake valve (15b; 15a) is routed from a control face of the load-lowering brake valve (15b; 15a), which control face acts in the direction of the throughflow position (18b; 18a), to a control pressure line (10a; 10b) which conducts the actuating pressure (pA; pB) of the control valve (2), a throttle device (21a; 21b) being arranged in the pilot control line (20a; 20b), and the pilot control line (20a; 20b) being connected between the throttle device (21a; 21b) and the load-lowering brake valve (15b; 15a) to the discharge line (22a; 22b) which is routed to the inlet side and in which a further throttle device (23a; 23b) and, downstream of the further throttle device (23a; 23b), the shut-off valve (24a; 24b) which opens in the direction of the inlet side are arranged.
  3. Hydraulic control valve device according to Claim 2, characterized in that the throttle device (21a; 21b; 23a; 23b) are configured as orifice plates or nozzles.
EP12157756.3A 2011-03-22 2012-03-01 Hydraulic control valve device Active EP2503161B1 (en)

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CN105593438B (en) 2013-05-31 2019-07-05 伊顿智能动力有限公司 For reducing the hydraulic system and method for swing arm bounce by balanced protection
WO2015031821A1 (en) * 2013-08-30 2015-03-05 Eaton Corporation Control method and system for using a pair of independent hydraulic metering valves to reduce boom oscillations
CN105940241B (en) 2013-11-14 2018-11-20 伊顿公司 Reduce the control strategy of swing arm oscillation
EP3069030B1 (en) 2013-11-14 2020-12-30 Eaton Intelligent Power Limited Pilot control mechanism for boom bounce reduction
US10323663B2 (en) 2014-07-15 2019-06-18 Eaton Intelligent Power Limited Methods and apparatus to enable boom bounce reduction and prevent un-commanded motion in hydraulic systems
EP3615813A4 (en) 2017-04-28 2021-01-27 Eaton Intelligent Power Limited System with motion sensors for damping mass-induced vibration in machines
EP3615814A4 (en) 2017-04-28 2021-01-27 Eaton Intelligent Power Limited System for damping mass-induced vibration in machines having hydraulically controlled booms or elongate members

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CN102691683B (en) 2016-02-03
EP2503161A2 (en) 2012-09-26
DE102011014685A1 (en) 2012-09-27
CN102691683A (en) 2012-09-26
JP2012197937A (en) 2012-10-18
EP2503161A3 (en) 2016-02-10
JP5959252B2 (en) 2016-08-02

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