EP2233641B1 - Hydraulic control assembly for the screed of a road finisher - Google Patents

Hydraulic control assembly for the screed of a road finisher Download PDF

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Publication number
EP2233641B1
EP2233641B1 EP10002445.4A EP10002445A EP2233641B1 EP 2233641 B1 EP2233641 B1 EP 2233641B1 EP 10002445 A EP10002445 A EP 10002445A EP 2233641 B1 EP2233641 B1 EP 2233641B1
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EP
European Patent Office
Prior art keywords
pressure
screed
hydraulic
control arrangement
hydraulic control
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EP10002445.4A
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German (de)
French (fr)
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EP2233641B2 (en
EP2233641A2 (en
EP2233641A3 (en
Inventor
Hermann Christ
Irina Hagen
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Bomag GmbH and Co OHG
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Bomag GmbH and Co OHG
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Application filed by Bomag GmbH and Co OHG filed Critical Bomag GmbH and Co OHG
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
    • E01C2301/14—Extendable screeds

Definitions

  • the present invention relates to a hydraulic control arrangement according to the preamble of claim 1.
  • the JP 2006-161290 A discloses a paving machine having means for producing the road surface which is passed over the road. Control means are provided which regulate the contact pressure for applying the device to the road surface as a function of the driving speed. In this case, a piston rod side pressure is provided for relief. Similar devices are in the JP 2006-161421 A and the JP 2002-285513 A shown.
  • the temperature of the mixed material to be incorporated plays an important role. It is also important to maintain a constant installation speed. Due to external disturbances, it may be necessary to quickly change the position of the screed with respect to the ground. When stopping or starting the paver special skill is required to perform the construction properly and thus avoid costly rework.
  • the invention has for its object to avoid the disadvantages of the conventional control or regulation of hydraulic actuation cylinders for planks and to improve the quality of installation. Furthermore, the control should be efficient and with as little loss as possible.
  • the control arrangement according to the invention is designed such that the load pressure and the relief pressure in response to a predetermined operating state is regulated, being controlled in a mode "control of screed load” via a proportional pressure control valve of the actuating cylinder piston rod side supplied relief pressure.
  • load pressure is meant that pressure which leads to lowering of the screed. Accordingly, the “relief pressure” is understood to mean the pressure which leads to the lifting of the screed.
  • Predetermined operating conditions may differ depending on the installation speed of the paver. There are also start-up and stopping operations under predetermined operating conditions. As mentioned above, unexpected faults can occur on a construction site, for example unevenness in the floor, temperature changes, etc., so that a more uniform installation of road surface is made more difficult. According to the invention, the operator of the road paver is facilitated insofar as he can prescribe operating states or operating modes so that the installation quality is kept constant despite external influences.
  • the loading pressure or relief pressure is regulated as a function of the speed of the road paver.
  • the screed "floats" in use on the mix and learns depending on the paving speed different forces acting on him. It is therefore preferred that the travel speed of the paver be used as a parameter for controlling the loading or unloading pressure.
  • the hydraulic control arrangement is further configured such that in an operating state "sinks of Bohle" the piston rod side emerging, entering via a second consumer port in the hydraulic control assembly hydraulic oil is supplied via a first consumer port again the piston side of the hydraulic cylinder.
  • the hydraulic control arrangement is designed such that in the operating state "lowering of the screed" via a further, external or internal tank connection, the hydraulic oil is supplied from a tank to the piston side of the hydraulic cylinder.
  • the hydraulic control arrangement has a double current regulator.
  • a “double current regulator” comprises two current regulators connected in parallel, which are provided in each case only for one direction of flow due to check valves.
  • This double flow regulator is preferably arranged in that line section which is connected to the piston side of the hydraulic cylinder. The provision of the double current regulator allows a uniform lifting and lowering of the screed.
  • the hydraulic control arrangement comprises a pressure sensor, which is designed to detect the piston rod or piston side pressure, wherein the load pressure or relief pressure is controlled in dependence on the detected piston rod and / or piston side pressure.
  • a pressure sensor which is designed to detect the piston rod or piston side pressure, wherein the load pressure or relief pressure is controlled in dependence on the detected piston rod and / or piston side pressure.
  • the volume flow of the hydraulic oil or the supply pressure present at the supply connection to the hydraulic control arrangement can be regulated with low loss by means of a control pump.
  • This makes it possible to set a value for the volume flow or pressure corresponding to the demand instead of a constant volume flow or constant pressure.
  • the pressure when starting or stopping the paver may be higher than during normal operation. Control with advance and overrun is possible.
  • the invention further relates to a control system with two of the described hydraulic control arrangements.
  • the control system comprises two double-acting hydraulic cylinders, which are connected rod side relative to a central axis of the screed opposite each other with the screed, wherein they are independently controllable from each other.
  • the main planks of the road pavers are equipped with extendable or attachable additional planks. There are installation situations in which these additional planks can not be arranged symmetrically to each other.
  • the respective relief pressure in the cylinders is changed in proportion to the asymmetrical broadening of the screed, so that a uniform line load of the screed is achieved.
  • the two separately controllable hydraulic cylinders are preferably located to the left and right of the center of gravity of the main screed, with the same distance from the center of gravity. If the additional planks are moved out, it can be determined via path measuring devices, which are arranged on the individual additional planks directly or at other suitable locations on the paver, for example on the cylinders, whether and on which side an asymmetrical screed extension is present.
  • the volume flow of the hydraulic oil or the supply pressure present at the supply connection to the control system via the supply connection can be regulated with low loss by means of a control pump.
  • This makes it possible to set a value for the volume flow or pressure corresponding to the demand instead of a constant volume flow or constant pressure.
  • the pressure when starting or stopping the paver may be higher than during normal operation.
  • control system is for each.
  • Hydraulic cylinder has its own double current regulator.
  • FIG. 1 shows the side view of a road finisher 40 of the invention.
  • a screed 41 is articulated at the point 42 and can be raised, lowered and held in any position by means of a double-acting actuating cylinder 2.
  • the articulation point 42 itself is height-adjustable via a leveling cylinder 43 in order to predetermine the setting angle of the screed 41. This angle of employment, in combination with the driving speed, primarily determines the installation thickness.
  • the actuating cylinder 2 is on the piston side, ie with the cylinder housing 2a, hingedly connected to the chassis of the paver 40. Piston rod side of the actuating cylinder 2 is pivotally connected to the screed 41.
  • the screed 41 generates due to its own weight, the weight F B , which is directed vertically downwards. In the position shown, the paver 40 is on the way to the place of use, so that no force is exerted directly from the screed 41 to the ground.
  • FIG. 2 shows a hydraulic plan of the control arrangement 1 according to the invention in "holding the screed".
  • the screed 41 is held in a raised position, for example for a transport movement.
  • none of the directional control valves 11 to 16 is switched, so that they are not energized.
  • Spring-loaded check valves 21 to 24 prevent a connection in the shown mode.
  • all valves are designed as seat valves, so that no leakage can occur.
  • the pressures that rest on the piston side and piston rod side are held, so that no sinking of the screed 41 can take place.
  • a further actuating cylinder 3 can preferably be connected in parallel.
  • FIG. 3 shows a hydraulic plan of the control arrangement 1 according to the invention in "lifting the screed".
  • the directional control valves 11, 12, 13 connected, also recognizable by the "lightning symbols” in addition to the valve actuation elements, so that they are energized.
  • the supply pressure which is preferably constant at 150 bar, wherein other supply pressures are possible depending on the cylinder dimensions and screed weight, is taken over the supply connection 5 for the control arrangement according to the invention.
  • the control arrangement 1 according to the invention forms one of many units of the road paver, which have different functions.
  • a supply unit (not shown) provides the constant supply pressure, so that various consumers in the sense of a "socket" can connect to it.
  • valves 11, 12 is the throttled operating pressure piston rod side in the actuating cylinder 2.
  • the hydraulic oil is pushed out of the piston side and via port 7 and the valves 13, 11, 21 supplied to the tank connection 6.
  • the piston 2b is moved upward in the direction of the arrow 34 so that the screed 41 attached to the piston rod 2c is lifted.
  • the valve 12 is switched in a time-delayed manner in order to prevent a slight sagging of the screed 41 at the beginning of the lifting operation. The reverse applies accordingly when stopping.
  • FIG. 4 shows a hydraulic plan of the control arrangement 1 according to the invention in "lowering the screed".
  • Pavers for road pavers can weigh up to several tons. Therefore, the weight of the screed 41 is used during lowering and the valve 11 is brought into the initial position shown.
  • the piston rod-side displaced oil when lowering the screed is throttled over a shutter 25 to determine the lowering speed.
  • Valves 12, 13 are energized and the piston rod side displaced hydraulic oil is supplied via valve 11 again the piston side of the actuating cylinder 2.
  • the still missing difference is refilled via the check valve 22 from the biased tank port 6a, so that no cavitation occurs.
  • the piston rod 2 c moves together with screed 41 in the direction of arrow 35 shown.
  • FIG. 5 shows a hydraulic plan of the control arrangement 1 according to the invention during "swimming" of the screed 41.
  • the screed 41 lies with its entire weight on the freshly built mix. Only valves 12, 13 are switched. Piston side and piston rod side of the actuating cylinder 2, 3 are again in communication. Supply connection 5 and tank connection 6 are mainly without function. It is only the difference in unevenness, etc. offset over the check valves 21, 22.
  • FIG. 6 shows a hydraulic plan of the control arrangement 1 according to the invention in "controlling the screed load".
  • the adjustable pressure range of the proportional valve 15 begins near 0.
  • the relief of the screed 41 leads inter alia to increase the rear axle load of the paver 40, so that a better traction is achieved.
  • Secondary pressure relief valves 17, 18 ensure safety in the event of an increased external pressure system pressure.
  • the pressure regulated by valve 15 is increased to compensate for the force generated by the buoyancy during installation so that the screed 41 does not sink onto the hot mix.
  • the relief pressure can be regulated in proportion to the travel speed of the road paver 40.
  • FIG. 7 shows a hydraulic plan of the control arrangement 1 according to the invention in "controlling the screed load and additional unloading".
  • this function can be activated by spring-loaded push button (not shown).
  • the plank 41 is relieved by increased pressure, adjustable at the valve 15, to the piston rod sides of the actuating cylinder 2, 3, ie moved in the direction of arrow 34, so as to realize higher tensile force transmission.
  • FIG. 8 shows a hydraulic plan of the control arrangement 1 according to the invention in "controlling the screed load and additional pressing".
  • the control arrangement according to the invention described acts in parallel on both hydraulic cylinders 2 and 3. This is sufficient for the majority of applications, especially in the small pavers. Be heavy machines, especially with Bohleverbreiterept, it may be useful to separately provide the control arrangement according to the invention for each hydraulic cylinder 2, 3, so that each cylinder 2, 3 is controlled separately.
  • the screed 41 is not symmetrically widened and thus the center of gravity of the screed 41 is no longer exactly between the two hydraulic cylinders 2, 3, it is advantageous instead of a parallel control of the cylinders 2, 3 via a control arrangement according to the invention for each cylinder 2, 3 to provide a separate control arrangement.
  • FIG. 9 shows an alternative embodiment of the control arrangement according to the invention. It is different from the one in FIGS. 1 to 8 shown first embodiment in that the valves 14 and 16 of the first embodiment have been replaced by a 3/3-way valve 14a.
  • the Bohle 41 can be loaded or unloaded according to the current driving condition.
  • the advantages over the first embodiment are on the one hand in the reduction the number of components and the other in the simplification of the switching operations, for example, for "pressing" the screed 41, ie additional exercise of defined load pressure, instead of two switching operations, namely switching valves 14 and 16, only one switching operation for valve 14a is needed.
  • the operating mode "control and unloading" is present. In this case, as required, a regulated relief pressure on the Kolbestangeneat the hydraulic cylinders 2, 3 will be given, so that the screed 41 can move in the direction of arrow 34.
  • FIG. 10 shows a further embodiment of the control arrangement according to the invention.
  • the 2/2-way valves 14, 16 are no longer at least partially "in series" but arranged in parallel, the output of the valve 14 to the piston rod sides and the output of the valve 16 to the piston sides of the hydraulic cylinders 2, 3 are connected. It can also be with this embodiment optionally, according to the current driving condition, the Bohle 41 load or relieve.
  • the pressure regulated by the pressure regulating valve 15 is applied to the piston sides of the hydraulic cylinders 2, 3 by actuation of the valve 16, so that the screed experiences an additional force in the direction of the arrow 35.
  • FIG. 11 shows a first embodiment of a control system 100 with two control arrangements 1, 1 'according to the invention. They are connected in parallel in such a way that they have as common components only the directional control valve 11, the check valves 21, 22 and the terminals 5, 6 and 6a.
  • the second control arrangement 1 'otherwise represents a doubling of the first control arrangement 1 with the same components.
  • the two control arrangements 1, 1' have inter alia separately operable pressure control valves 15, 15 'and actuating cylinders 2, 3.
  • the separately controlled pressures are indicated in each case via the pressure gauges 60, 60 '.
  • the pressure sensors 50, 50 ' detect the respective pressures on the piston side of the hydraulic cylinders 2, 3. These pressures are ideal as parameters for controlling the screed load. Thanks to the double current regulator 40, 40 ', each with two current regulators 40a, 40b, a uniform lifting and lowering of the screed 41 is possible even if the screed 41 is extended on one side.
  • FIG. 12 shows a further embodiment of the control system 100 according to the invention.
  • the control system 100 has the possibility of additional pressing of the screed 41 with the aid of additional load pressures, the can be introduced via the valves 16, 16 'on the piston sides of the cylinder 2, 3 (comparable to Fig. 10 ).
  • This pressing function is not required for most embodiments, as long as the overall center of gravity of the screed 41 between the articulation points of the two cylinders 2, 3 is located. However, if the center of gravity lies outside due to the design, then additional pressure can be used to ensure even and even load distribution.
  • a control pump 101 is shown, which ensures a regulated volume flow or pressure.
  • the flow or the pressure can be regulated according to demand. This leads to a low-loss and efficient operation of the hydraulic control arrangement 1 and the control system 100. With the aid of the control valve 102, the volume flow of the hydraulic oil flowing through the point 103 can be regulated.
  • the control valve 102 may also be designed to control the pressure. As in Fig. 12 shown, at the point or node 103, a return line of another consumer (not shown) may be connected.
  • FIG. 13 schematically shows a view of the screed 41 with uneven weight distribution.
  • the screed 41 comprises a main screed 1001 and two screed spacers 1002 and 1003, which are hydraulically extendable individually via the traversing cylinders 1008 or 1009.
  • additional additional planks 1004 to 1007 can be screwed to the spreader extensions 1002, 1003 to widen the working width.
  • the actuating cylinders 2 and 3 designed as double-acting hydraulic cylinders are articulated on one side of a base beam 1001 at the same distance from the axis of symmetry 1015. With symmetrical widening of the screed 41, the overall center of gravity of the screed 41 lies on the symmetry line 1015.
  • the cylinders 2 and 3 would preferably be supplied with the same loading and unloading pressure.
  • FIG. 13 there are installation situations in which an asymmetrical broadening of the screed 41 is advantageous, as in FIG. 13 is shown.
  • the center of gravity 1010 of the screed 41 shifts to the right by a length 1012, so that the line of action of the weight force 1011 of the screed 41 is also shifted by the length 1012 from the axis of symmetry 1015.
  • Wegmessvorlegicardien 1013, 1014 are provided according to the invention, which are each arranged on one of the Verfahrzylinder 1008, 1009 and specify exactly what amount the piston rods of the Verfahrzylinder 1008, 1009 are extended. From the measured values, the displacement 1012 of the center of gravity 1010 can be determined exactly.
  • the actuating cylinders 2, 3 with uneven weight distribution due to asymmetric Bohlenverbreiterung independent operated from each other, so that an overall uniform, even distribution and compression of the material is achieved.
  • the right cylinder 2 could slightly raise the right side of the ground pile 1001 to counteract inclination due to the displacement 1012 of the center of gravity 1011. It is also conceivable to press the left side of the base pile 1001 over the left cylinder 3 on the material to be laid. It is of course also possible to carry out both measures simultaneously.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die vorliegende Erfindung betrifft eine hydraulische Steueranordnung nach dem Oberbegriff des Anspruchs 1.The present invention relates to a hydraulic control arrangement according to the preamble of claim 1.

Die JP 2006-161290 A offenbart eine Straßenfertigungsmaschine mit einer Einrichtung zur Herstellung der Fahrbahnoberfläche, die über die Straße geführt wird. Es sind Regelungsmittel vorgesehen, die in Abhängigkeit der Fahrgeschwindigkeit den Anpressdruck zum Beaufschlagen der Einrichtung auf die Fahrbahnoberfläche regeln. Dabei wird ein kolbenstangenseitiger Druck zur Entlastung bereitgestellt. Ähnliche Vorrichtungen sind in der JP 2006-161421 A und der JP 2002-285513 A gezeigt.The JP 2006-161290 A discloses a paving machine having means for producing the road surface which is passed over the road. Control means are provided which regulate the contact pressure for applying the device to the road surface as a function of the driving speed. In this case, a piston rod side pressure is provided for relief. Similar devices are in the JP 2006-161421 A and the JP 2002-285513 A shown.

Beim Einbau von Mischgut müssen verschiedene Faktoren berücksichtigt werden, die die Einbauqualität maßgeblich beeinflussen. Beispielsweise spielt die Temperatur des einzubauenden Mischguts eine wichtige Rolle. Ebenso ist es wichtig, eine konstante Einbaugeschwindigkeit einzuhalten. Aufgrund von äußeren Störungen kann es erforderlich sein, die Position der Bohle in Bezug auf den Untergrund schnell zu verändern. Beim Anhalten oder Anfahren des Straßenfertigers ist besonderes Geschick gefragt, um die Bauarbeiten ordnungsgemäß auszuführen und somit kostenintensive Nacharbeiten zu vermeiden.When incorporating mixed material, various factors must be taken into account that significantly influence the quality of the installation. For example, the temperature of the mixed material to be incorporated plays an important role. It is also important to maintain a constant installation speed. Due to external disturbances, it may be necessary to quickly change the position of the screed with respect to the ground. When stopping or starting the paver special skill is required to perform the construction properly and thus avoid costly rework.

Der Erfindung liegt die Aufgabe zugrunde, die Nachteile der herkömmlichen Steuerung bzw. Regelung von hydraulischen Betätigungszylindern für Bohlen zu vermeiden und die Einbauqualität zu verbessern. Ferner soll die Ansteuerung effizient und mit möglichst wenig Verlust behaftet sein.The invention has for its object to avoid the disadvantages of the conventional control or regulation of hydraulic actuation cylinders for planks and to improve the quality of installation. Furthermore, the control should be efficient and with as little loss as possible.

Die Aufgabe wird gelöst durch den Gegenstand des unabhängigen Anspruchs 1.The object is solved by the subject matter of independent claim 1.

Die abhängigen Ansprüche sind auf vorteilhafte Ausführungsformen der Erfindung gerichtet.The dependent claims are directed to advantageous embodiments of the invention.

Die erfindungsgemäße Steueranordnung ist derart ausgebildet, dass der Belastungsdruck und der Entlastungsdruck in Abhängigkeit von einem vorgegebenen Betriebszustand regelbar ist, wobei in einem Betriebszustand "Regelung der Bohlenlast" über ein proportionales Druckregelventil der dem Betätigungszylinder kolbenstangenseitig zugeführte Entlastungsdruck geregelt wird.The control arrangement according to the invention is designed such that the load pressure and the relief pressure in response to a predetermined operating state is regulated, being controlled in a mode "control of screed load" via a proportional pressure control valve of the actuating cylinder piston rod side supplied relief pressure.

Unter dem "Belastungsdruck" wird hierbei derjenige Druck verstanden, der zum Senken der Bohle führt. Entsprechend wird unter dem "Entlastungsdruck" derjenige Druck verstanden, der zum Heben der Bohle führt. "Vorgegebene Betriebszustände" können sich in Abhängigkeit von der Einbau- bzw. Fahrtgeschwindigkeit des Straßenfertigers unterscheiden. Es fallen auch Anfahr- bzw. Anhaltevorgänge unter vorgegebene Betriebszustände. Wie eingangs angesprochen, können auf einer Baustelle unerwartete Störungen auftreten, beispielsweise Bodenunebenheiten, Temperaturänderungen etc, so dass ein gleichmäßiger Einbau von Straßenbelag erschwert wird. Dem Bediener des Straßenfertigers wird die Arbeit erfindungsgemäß insofern erleichtert, als dass er Betriebszustände bzw. Betriebsmodi vorgeben kann, damit trotz äußerer Einflüsse die Einbauqualität konstant gehalten wird.By "load pressure" is meant that pressure which leads to lowering of the screed. Accordingly, the "relief pressure" is understood to mean the pressure which leads to the lifting of the screed. "Predetermined operating conditions" may differ depending on the installation speed of the paver. There are also start-up and stopping operations under predetermined operating conditions. As mentioned above, unexpected faults can occur on a construction site, for example unevenness in the floor, temperature changes, etc., so that a more uniform installation of road surface is made more difficult. According to the invention, the operator of the road paver is facilitated insofar as he can prescribe operating states or operating modes so that the installation quality is kept constant despite external influences.

Vorzugsweise wird der Belastungsdruck oder Entlastungsdruck in Abhängigkeit von der Fahrtgeschwindigkeit des Straßenfertigers geregelt. Die Bohle "schwimmt" im Einsatz auf dem Mischgut und erfährt in Abhängigkeit von der Einbaugeschwindigkeit unterschiedliche Kräfte, die an ihm wirken. Es wird daher bevorzugt die Fahrtgeschwindigkeit des Straßenfertigers als ein Parameter zur Regelung des Be- oder Entlastungsdrucks verwendet.Preferably, the loading pressure or relief pressure is regulated as a function of the speed of the road paver. The screed "floats" in use on the mix and learns depending on the paving speed different forces acting on him. It is therefore preferred that the travel speed of the paver be used as a parameter for controlling the loading or unloading pressure.

Vorzugsweise ist die hydraulische Steueranordnung ferner derart ausgebildet ist, dass in einem Betriebszustand "Senken der Bohle" das kolbenstangenseitig austretende, über einen zweiten Verbraucheranschluss in die hydraulische Steueranordnung eintretende Hydrauliköl über einen ersten Verbraucheranschluss wieder der Kolbenseite des Hydraulikzylinders zugeführt wird.Preferably, the hydraulic control arrangement is further configured such that in an operating state "sinks of Bohle" the piston rod side emerging, entering via a second consumer port in the hydraulic control assembly hydraulic oil is supplied via a first consumer port again the piston side of the hydraulic cylinder.

Weiterhin ist es bevorzugt, dass die hydraulische Steueranordnung derart ausgebildet ist, dass in dem Betriebszustand "Senken der Bohle" über einen weiteren, externen oder internen Tankanschluss das Hydrauliköl aus einem Tank der Kolbenseite des Hydraulikzylinders zugeführt wird.Furthermore, it is preferred that the hydraulic control arrangement is designed such that in the operating state "lowering of the screed" via a further, external or internal tank connection, the hydraulic oil is supplied from a tank to the piston side of the hydraulic cylinder.

In einer vorteilhaften Ausführungsform der Erfindung weist die hydraulische Steueranordnung einen doppelten Stromregler auf. Ein "doppelter Stromregler" umfasst zwei parallel geschaltete Stromregler, welche aufgrund von Rückschlagventilen jeweils nur für eine Durchflussrichtung vorgesehen sind. Dieser doppelte Stromregler ist vorzugsweise in demjenigen Leitungsabschnitt angeordnet, welcher mit der Kolbenseite des Hydraulikzylinders verbunden ist. Durch das Vorsehen des doppelten Stromreglers wird ein gleichmäßiges Heben und Senken der Bohle ermöglicht.In an advantageous embodiment of the invention, the hydraulic control arrangement has a double current regulator. A "double current regulator" comprises two current regulators connected in parallel, which are provided in each case only for one direction of flow due to check valves. This double flow regulator is preferably arranged in that line section which is connected to the piston side of the hydraulic cylinder. The provision of the double current regulator allows a uniform lifting and lowering of the screed.

In einer weiteren bevorzugten Weiterbildung umfasst die hydraulische Steueranordnung einen Drucksensor, welcher zur Erfassung des kolbenstangen- oder kolbenseitigen Drucks ausgebildet ist, wobei der Belastungsdruck oder Entlastungsdruck in Abhängigkeit vom erfassten kolbenstangen-und/oder kolbenseitigen Druck geregelt wird. Damit sehen für die Regelung des Be- oder Entlastungsdrucks der Bohle zwei weitere Parameter, nämlich der Druck auf der Gehäuse- bzw. Kolbenseite und der Druck auf der Kolbenstangenseite des Hydraulikzylinders zur Verfügung. Da die Drucksensoren in direkter Nähe zum Zylinder angeordnet werden, kann bei Bedarf schnell reagiert und die gewünschten Werte eingestellt werden.In a further preferred embodiment, the hydraulic control arrangement comprises a pressure sensor, which is designed to detect the piston rod or piston side pressure, wherein the load pressure or relief pressure is controlled in dependence on the detected piston rod and / or piston side pressure. Thus, two further parameters, namely the pressure on the housing or piston side and the pressure on the piston rod side of the hydraulic cylinder, are available for the regulation of the loading or unloading pressure of the screed. Since the pressure sensors are arranged in close proximity to the cylinder, it is possible to react quickly and to set the desired values if required.

Vorzugsweise ist der der hydraulischen Steueranordnung über den Versorgungsanschluss zugeführte Volumenstrom des Hydrauliköls oder der am Versorgungsanschluss vorliegende Versorgungsdruck verlustarm mit einer Regelpumpe regelbar. Dadurch ist es möglich, anstelle eines konstanten Volumenstroms bzw. konstanten Druckes einen dem Bedarf entsprechenden Wert für den Volumenstrom oder Druck einzustellen. Beispielsweise kann der Druck beim Anfahren oder Stoppen des Fertigers einen höheren Wert aufweisen als im normalen Betrieb. Regelung mit Vorlauf und Nachlauf ist möglich.Preferably, the volume flow of the hydraulic oil or the supply pressure present at the supply connection to the hydraulic control arrangement can be regulated with low loss by means of a control pump. This makes it possible to set a value for the volume flow or pressure corresponding to the demand instead of a constant volume flow or constant pressure. For example, the pressure when starting or stopping the paver may be higher than during normal operation. Control with advance and overrun is possible.

Die Erfindung betrifft ferner ein Steuersystem mit zwei der beschriebenen hydraulischen Steueranordnungen. Dabei umfasst das Steuersystem zwei doppeltwirkende Hydraulikzylinder, welche kolbenstangenseitig bezüglich einer Mittelachse der Bohle einander gegenüberliegend mit der Bohle verbunden sind, wobei sie voneinander unabhängig regelbar sind. Zur Erhöhung der Arbeitsbreite werden die Hauptbohlen der Straßenfertiger mit herausfahrbaren oder anstückelbaren Zusatzbohlen ausgestattet. Es gibt Einbausituationen, bei denen diese Zusatzbohlen nicht symmetrisch zueinander angeordnet werden können. Hierbei ist es vorteilhaft, die Hydraulikzylinder, die einander bezüglich der Mittelachse der Hauptbohle gegenüberliegend mit der Hauptbohle verbunden sind, separat anzusteuern, so dass insgesamt eine symmetrische Be- bzw. Entlastung der Bohle trotz der asymmetrischen Gewichtsverteilung erreicht werden kann. Beispielsweise wird der jeweilige Entlastungsdruck in den Zylindern proportional mit der unsymmetrischen Verbreiterung der Bohle geändert, so dass eine gleichmäßige Linienlast der Bohle erzielt wird. Die zwei separat voneinander ansteuerbaren Hydraulikzylinder befinden sich vorzugsweise links und rechts vom Schwerpunkt der Hauptbohle, mit gleichem Abstand vom Schwerpunkt entfernt. Werden die Zusatzbohlen herausgefahren, so können über Wegmessvorrichtungen, die an den einzelnen Zusatzbohlen direkt oder an anderen geeigneten Stellen des Fertigers, beispielsweise an den Zylindern, angeordnet sind, ermittelt werden, ob und auf welcher Seite eine unsymmetrische Bohlenverbreiterung vorliegt. In Abhängigkeit von der Verschiebung des Schwerpunktes infolge der unsymmetrischen Verbreiterung kann der linke Hydraulikzylinder mit einem unterschiedlichen Druck beaufschlagt werden als der rechte Hydraulikzylinder, so dass insgesamt eine konstante Last auf den zu verlegenden Asphalt ausgeübt werden kann.The invention further relates to a control system with two of the described hydraulic control arrangements. In this case, the control system comprises two double-acting hydraulic cylinders, which are connected rod side relative to a central axis of the screed opposite each other with the screed, wherein they are independently controllable from each other. To increase the working width, the main planks of the road pavers are equipped with extendable or attachable additional planks. There are installation situations in which these additional planks can not be arranged symmetrically to each other. In this case, it is advantageous to separately control the hydraulic cylinders, which are connected to one another with respect to the central axis of the main beam, so that overall a symmetrical loading or unloading of the screed can be achieved despite the asymmetrical weight distribution. For example, the respective relief pressure in the cylinders is changed in proportion to the asymmetrical broadening of the screed, so that a uniform line load of the screed is achieved. The two separately controllable hydraulic cylinders are preferably located to the left and right of the center of gravity of the main screed, with the same distance from the center of gravity. If the additional planks are moved out, it can be determined via path measuring devices, which are arranged on the individual additional planks directly or at other suitable locations on the paver, for example on the cylinders, whether and on which side an asymmetrical screed extension is present. Depending on the shift of the center of gravity due to the asymmetrical broadening of the left hydraulic cylinders are subjected to a different pressure than the right hydraulic cylinder, so that a total of a constant load can be exerted on the asphalt to be laid.

Vorzugsweise ist der dem Steuersystem über den Versorgungsanschluss zugeführte Volumenstrom des Hydrauliköls oder der am Versorgungsanschluss vorliegende Versorgungsdruck verlustarm mit einer Regelpumpe regelbar. Dadurch ist es möglich, anstelle eines konstanten Volumenstroms bzw. konstanten Druckes einen dem Bedarf entsprechenden Wert für den Volumenstrom oder Druck einzustellen. Beispielsweise kann der Druck beim Anfahren oder Stoppen des Fertigers einen höheren Wert aufweisen als im normalen Betrieb.Preferably, the volume flow of the hydraulic oil or the supply pressure present at the supply connection to the control system via the supply connection can be regulated with low loss by means of a control pump. This makes it possible to set a value for the volume flow or pressure corresponding to the demand instead of a constant volume flow or constant pressure. For example, the pressure when starting or stopping the paver may be higher than during normal operation.

Vorzugsweise weist das Steuersystem für jeden. Hydraulikzylinder einen eigenen doppelten Stromregler auf.Preferably, the control system is for each. Hydraulic cylinder has its own double current regulator.

Nachfolgend wird die Erfindung anhand von Figuren weiter erläutert. Es zeigen schematisch:

Fig. 1
eine Seitenansicht eines Straßenfertigers mit einer Bohle;
Fig. 2
einen Hydraulikplan eines ersten Ausführungsbeispiels im Betriebszustand "Halten der Bohle";
Fig. 3
einen Hydraulikplan eines ersten Ausführungsbeispiels im Betriebszustand "Heben der Bohle";
Fig. 4
einen Hydraulikplan eines ersten Ausführungsbeispiels im Betriebszustand "Senken der Bohle";
Fig. 5
einen Hydraulikplan eines ersten Ausführungsbeispiels im Betriebszustand "Schwimmen";
Fig. 6
einen Hydraulikplan eines ersten Ausführungsbeispiels im Betriebszustand "Regeln der Bohlenlast";
Fig. 7
einen Hydraulikplan eines ersten Ausführungsbeispiels im Betriebszustand "Regeln und Entlasten";
Fig. 8
einen Hydraulikplan eines ersten Ausführungsbeispiels im Betriebszustand "Regeln und Andrücken";
Fig. 9
einen Hydraulikplan eines zweiten Ausführungsbeispiels im Betriebszu- zustand "Regeln und Entlasten";
Fig. 10
einen Hydraulikplan eines dritten Ausführungsbeispiels im Betriebszustand "Regeln und Andrücken";
Fig. 11
einen Hydraulikplan eines Steuersystems mit zwei hydraulischen Steueranordnungen;
Fig. 12
einen Hydraulikplan eines weiteren Steuersystems;
Fig. 13
eine Ansicht auf die Bohle 41 bei ungleichmäßiger Gewichtsverteilung.
The invention will be further explained with reference to figures. They show schematically:
Fig. 1
a side view of a road finisher with a screed;
Fig. 2
a hydraulic plan of a first embodiment in the operating state "holding the screed";
Fig. 3
a hydraulic plan of a first embodiment in the operating state "lifting the screed";
Fig. 4
a hydraulic plan of a first embodiment in the operating state "lowering the screed";
Fig. 5
a hydraulic plan of a first embodiment in the operating state "swimming";
Fig. 6
a hydraulic plan of a first embodiment in the operating condition "rules of screed load";
Fig. 7
a hydraulic plan of a first embodiment in the operating state "control and unloading";
Fig. 8
a hydraulic plan of a first embodiment in the operating state "rules and pressing";
Fig. 9
a hydraulic diagram of a second embodiment in the operating condition "regulating and unloading";
Fig. 10
a hydraulic diagram of a third embodiment in the operating state "rules and pressing";
Fig. 11
a hydraulic plan of a control system with two hydraulic control arrangements;
Fig. 12
a hydraulic plan of another control system;
Fig. 13
a view of the screed 41 with uneven weight distribution.

Figur 1 zeigt die Seitenansicht eines erfindungsgemäßen Straßenfertigers 40. An dem Straßenfertiger 40 ist eine Bohle 41 an der Stelle 42 angelenkt und kann mit Hilfe eines doppeltwirkenden Betätigungszylinders 2 gehoben, gesenkt und in einer beliebigen Stellung gehalten werden. Der Anlenkungspunkt 42 selbst ist über einen Nivellierzylinder 43 höhenverstellbar, um den Anstellungswinkel der Bohle 41 vorzugeben. Dieser Anstellungswinkel bestimmt in Kombination mit der Fahrtgeschwindigkeit in erster Linie die Einbaudicke. Der Betätigungszylinder 2 ist kolbenseitig, d. h. mit dem Zylindergehäuse 2a, mit dem Fahrgestell des Straßenfertigers 40 gelenkig verbunden. Kolbenstangenseitig ist der Betätigungszylinder 2 mit der Bohle 41 gelenkig verbunden. Die Bohle 41 erzeugt aufgrund des Eigengewichts die Gewichtskraft FB, die senkrecht nach unten gerichtet ist. In der gezeigten Stellung befindet sich der Straßenfertiger 40 auf dem Weg zum Einsatzort, so dass keine Kraft von der Bohle 41 auf den Untergrund direkt ausgeübt wird. FIG. 1 shows the side view of a road finisher 40 of the invention. On the paver 40, a screed 41 is articulated at the point 42 and can be raised, lowered and held in any position by means of a double-acting actuating cylinder 2. The articulation point 42 itself is height-adjustable via a leveling cylinder 43 in order to predetermine the setting angle of the screed 41. This angle of employment, in combination with the driving speed, primarily determines the installation thickness. The actuating cylinder 2 is on the piston side, ie with the cylinder housing 2a, hingedly connected to the chassis of the paver 40. Piston rod side of the actuating cylinder 2 is pivotally connected to the screed 41. The screed 41 generates due to its own weight, the weight F B , which is directed vertically downwards. In the position shown, the paver 40 is on the way to the place of use, so that no force is exerted directly from the screed 41 to the ground.

Figur 2 zeigt einen Hydraulikplan der erfindungsgemäßen Steueranordnung 1 beim "Halten der Bohle". In diesem Betriebsmodus wird die Bohle 41 beispielsweise für eine Transportbewegung in erhöhter Position gehalten. Dabei ist keines der Wegeventile 11 bis 16 geschaltet, so dass sie nicht bestromt sind. Federgespannte Rückschlagventile 21 bis 24 unterbinden im gezeigten Modus eine Verbindung. Vorzugsweise sind alle Ventile als Sitzventile ausgeführt, so dass keine Leckage auftreten kann. Die Drücke, die kolbenseitig und kolbenstangenseitig anliegen, werden gehalten, so dass kein Absinken der Bohle 41 stattfinden kann. Zwecks Symmetrie kann vorzugsweise ein weiterer Betätigungszylinder 3 parallel geschaltet werden. FIG. 2 shows a hydraulic plan of the control arrangement 1 according to the invention in "holding the screed". In this mode of operation, the screed 41 is held in a raised position, for example for a transport movement. In this case, none of the directional control valves 11 to 16 is switched, so that they are not energized. Spring-loaded check valves 21 to 24 prevent a connection in the shown mode. Preferably, all valves are designed as seat valves, so that no leakage can occur. The pressures that rest on the piston side and piston rod side are held, so that no sinking of the screed 41 can take place. For the purpose of symmetry, a further actuating cylinder 3 can preferably be connected in parallel.

Figur 3 zeigt einen Hydraulikplan der erfindungsgemäßen Steueranordnung 1 beim "Heben der Bohle". Hierbei sind die Wegeventile 11, 12, 13 geschaltet, auch erkennbar an den "Blitzsymbolen" neben den Ventilbetätigungselementen, so dass sie bestromt sind. Der Versorgungsdruck, der vorzugsweise konstant bei 150 bar liegt, wobei je nach Zylinderdimensionen und Bohlengewicht auch andere Versorgungsdrücke möglich sind, wird für die erfindungsgemäße Steueranordnung über den Versorgungsanschluss 5 entnommen. Die erfindungsgemäße Steueranordnung 1 bildet eine von vielen Einheiten des Straßenfertigers, die verschiedene Funktionen innehaben. Eine Versorgungseinheit (nicht dargestellt) stellt den konstanten Versorgungsdruck zur Verfügung, so dass sich diverse Verbraucher im Sinne einer "Steckdose" daran anschließen können. Über die Ventile 11, 12 liegt der gedrosselte Betätigungsdruck kolbenstangenseitig im Betätigungszylinder 2 an. Gleichzeitig wird das Hydrauliköl aus der Kolbenseite herausgedrückt und über Anschluss 7 und die Ventile 13, 11, 21 dem Tankanschluss 6 zugeführt. Der Kolben 2b wird nach oben in Richtung des Pfeils 34 bewegt, so dass die an der Kolbenstange 2c befestigte Bohle 41 gehoben wird. Vorzugsweise wird das Ventil 12 zeitversetzt geschaltet, um ein leichtes Durchsacken der Bohle 41 beim Beginn des Hebevorgangs zu verhindern. Umgekehrtes gilt entsprechend beim Anhalten. FIG. 3 shows a hydraulic plan of the control arrangement 1 according to the invention in "lifting the screed". Here, the directional control valves 11, 12, 13 connected, also recognizable by the "lightning symbols" in addition to the valve actuation elements, so that they are energized. The supply pressure, which is preferably constant at 150 bar, wherein other supply pressures are possible depending on the cylinder dimensions and screed weight, is taken over the supply connection 5 for the control arrangement according to the invention. The control arrangement 1 according to the invention forms one of many units of the road paver, which have different functions. A supply unit (not shown) provides the constant supply pressure, so that various consumers in the sense of a "socket" can connect to it. About the valves 11, 12 is the throttled operating pressure piston rod side in the actuating cylinder 2. At the same time, the hydraulic oil is pushed out of the piston side and via port 7 and the valves 13, 11, 21 supplied to the tank connection 6. The piston 2b is moved upward in the direction of the arrow 34 so that the screed 41 attached to the piston rod 2c is lifted. Preferably, the valve 12 is switched in a time-delayed manner in order to prevent a slight sagging of the screed 41 at the beginning of the lifting operation. The reverse applies accordingly when stopping.

Figur 4 zeigt einen Hydraulikplan der erfindungsgemäßen Steueranordnung 1 beim "Senken der Bohle". Bohlen für Straßenfertiger können bis zu mehreren Tonnen schwer sein. Daher wird das Eigengewicht der Bohle 41 beim Senken genutzt und das Ventil 11 in die gezeigte Ausgangsstellung gebracht. Das kolbenstangenseitig verdrängte Öl beim Senken der Bohle wird über eine Blende 25 angedrosselt, um die Senkgeschwindigkeit zu bestimmen. Ventile 12, 13 sind bestromt und das kolbenstangenseitig verdrängte Hydrauliköl wird über Ventil 11 wieder der Kolbenseite des Betätigungszylinders 2 zugeführt. Die noch fehlende Differenzmenge wird über das Rückschlagventil 22 vom vorgespannten Tankanschluss 6a nachgefüllt, so dass keine Kavitation auftritt. Die Kolbenstange 2c bewegt sich samt Bohle 41 in die gezeigte Pfeilrichtung 35. FIG. 4 shows a hydraulic plan of the control arrangement 1 according to the invention in "lowering the screed". Pavers for road pavers can weigh up to several tons. Therefore, the weight of the screed 41 is used during lowering and the valve 11 is brought into the initial position shown. The piston rod-side displaced oil when lowering the screed is throttled over a shutter 25 to determine the lowering speed. Valves 12, 13 are energized and the piston rod side displaced hydraulic oil is supplied via valve 11 again the piston side of the actuating cylinder 2. The still missing difference is refilled via the check valve 22 from the biased tank port 6a, so that no cavitation occurs. The piston rod 2 c moves together with screed 41 in the direction of arrow 35 shown.

Figur 5 zeigt einen Hydraulikplan der erfindungsgemäßen Steueranordnung 1 beim "Schwimmen" der Bohle 41. Hierbei liegt die Bohle 41 mit ihrem gesamten Gewicht auf dem frisch eingebauten Mischgut auf. Nur Ventile 12, 13 sind geschaltet. Kolbenseite und Kolbenstangenseite der Betätigungszylinder 2, 3 stehen wieder in Verbindung. Versorgungsanschluss 5 und Tankanschluss 6 sind hierbei hauptsächlich ohne Funktion. Es wird lediglich die Differenzmenge bei Unebenheiten etc. über die Rückschlagventile 21, 22 ausgeglichen. FIG. 5 shows a hydraulic plan of the control arrangement 1 according to the invention during "swimming" of the screed 41. In this case, the screed 41 lies with its entire weight on the freshly built mix. Only valves 12, 13 are switched. Piston side and piston rod side of the actuating cylinder 2, 3 are again in communication. Supply connection 5 and tank connection 6 are mainly without function. It is only the difference in unevenness, etc. offset over the check valves 21, 22.

Figur 6 zeigt einen Hydraulikplan der erfindungsgemäßen Steueranordnung 1 beim "Regeln der Bohlenlast". Um die Bohlenlast je nach Einsatz zu verringern, wird ein geregelter Druck über Druckregelventil 15, ein Proportionalventil welches den Druck in einem breiten Bereich von beispielsweise 7 bis 105 bar regeln kann, und über Ventil 14 auf die Kolbenstangenseiten der Betätigungszylinder 2, 3 geleitet. Vorzugsweise beginnt der einstellbare Druckbereich des Proportionalventils 15 nahe bei 0. Zur Vergrößerung der Auflösung des Druckregelbereichs, d. h. zur Erhöhung der Präzision des Be- und Entladungsdrucks, ist es vorteilhaft, den über das Proportionalventil 15 regelbaren, maximalen Druck zu optimieren. Die Entlastung der Bohle 41 führt unter anderem auch zur Erhöhung der hinteren Achslast des Straßenfertigers 40, so dass eine bessere Traktion erreicht wird. Sekundäre Druckbegrenzungsventile 17, 18 sorgen für Sicherheit im Falle eines durch äußere Belastung erhöhten Systemdrucks. Während des Anhaltens wird der von Ventil 15 geregelte Druck erhöht, um die durch den Auftrieb erzeugte Kraft während des Einbauens zu kompensieren, damit die Bohle 41 auf dem heißen Mischgut nicht einsinkt. Beim erneuten Anfahren wird das Ventil 13 für eine bestimmte Zeit geschlossen, damit die Bohle 41 durch ihren Auftrieb auf dem möglicherweise erkaltetem Mischgut nicht nach oben ausweichen kann. Erfindungsgemäß kann der Entlastungsdruck proportional zur Fahrtgeschwindigkeit des Straßenfertigers 40 geregelt werden. FIG. 6 shows a hydraulic plan of the control arrangement 1 according to the invention in "controlling the screed load". In order to reduce the screed load depending on the application, a regulated pressure via pressure control valve 15, a proportional valve which can regulate the pressure in a wide range, for example, 7 to 105 bar, and via valve 14 to the piston rod sides of the actuating cylinder 2, 3 passed. Preferably, the adjustable pressure range of the proportional valve 15 begins near 0. To increase the resolution of the pressure control range, ie to increase the precision of the loading and unloading pressure, it is advantageous to optimize the controllable via the proportional valve 15, maximum pressure. The relief of the screed 41 leads inter alia to increase the rear axle load of the paver 40, so that a better traction is achieved. Secondary pressure relief valves 17, 18 ensure safety in the event of an increased external pressure system pressure. During stoppage, the pressure regulated by valve 15 is increased to compensate for the force generated by the buoyancy during installation so that the screed 41 does not sink onto the hot mix. When restarting the valve 13 closed for a certain time, so that the screed 41 can not escape by their buoyancy on the possibly cooled Mischgut up. According to the invention, the relief pressure can be regulated in proportion to the travel speed of the road paver 40.

Figur 7 zeigt einen Hydraulikplan der erfindungsgemäßen Steueranordnung 1 beim "Regeln der Bohlenlast und zusätzliches Entlasten". Für den Fall, dass beim erneuten Anfahren bedingt durch erkaltetes Mischgut und dadurch erhöhter Zugkraftbedarf, beim radgetriebenen Straßenfertiger 40 die Räder durchdrehen, kann diese Funktion per federbelastetem Druckknopf (nicht dargestellt) aktiviert werden. Hierbei wird durch erhöhten Druck, einstellbar am Ventil 15, an den Kolbenstangenseiten der Betätigungszylinder 2, 3 die Bohle 41 entlastet, d. h. in Pfeilrichtung 34 bewegt, um somit höhere Zugkraftübertragung zu realisieren. FIG. 7 shows a hydraulic plan of the control arrangement 1 according to the invention in "controlling the screed load and additional unloading". In the event that when re-start due to cooled mix and thus increased traction, the wheel-driven paver 40 spin the wheels, this function can be activated by spring-loaded push button (not shown). Here, the plank 41 is relieved by increased pressure, adjustable at the valve 15, to the piston rod sides of the actuating cylinder 2, 3, ie moved in the direction of arrow 34, so as to realize higher tensile force transmission.

Figur 8 zeigt einen Hydraulikplan der erfindungsgemäßen Steueranordnung 1 beim "Regeln der Bohlenlast und zusätzliches Andrücken". Mit dem Ventil 16 lässt sich, um ein Aufschwimmen der Bohle 41 beim erneuten Anfahren zu verhindern, zusätzlich zum Bohleneigengewicht eine Kraft erzeugen, die abhängig ist vom Kolben-Stangen-Verhältnis und dem Druck, der auf die Bohle 41 wirkt. Dabei sind die Ventile 11, 12, 13 unbestromt (vorgespannte Schwimmstellung). FIG. 8 shows a hydraulic plan of the control arrangement 1 according to the invention in "controlling the screed load and additional pressing". With the valve 16 can, in order to prevent floating of the screed 41 when restarting, in addition to the Bohlenigengewicht generate a force that is dependent on the piston-rod ratio and the pressure acting on the screed 41. The valves 11, 12, 13 are de-energized (biased floating position).

Die beschriebene erfindungsgemäße Steueranordnung wirkt parallel auf beide Hydraulikzylinder 2 und 3. Dies ist für den größten Teil der Anwendungen, insbesondere bei den kleinen Straßenfertigern, ausreichend. Be schweren Maschinen, insbesondere mit Bohleverbreiterungen, kann es sinnvoll sein, die erfindungsgemäße Steueranordnung für jeden Hydraulikzylinder 2, 3 separat vorzusehen, so dass jeder Zylinder 2, 3 separat ansteuerbar ist. Insbesondere dann, wenn die Bohle 41 nicht symmetrisch verbreitert ist und somit der Schwerpunkt der Bohle 41 nicht mehr genau zwischen den beiden Hydraulikzylindern 2, 3 liegt, ist es vorteilhaft, anstelle einer parallelen Ansteuerung der Zylinder 2, 3 über eine erfindungsgemäße Steueranordnung für jeden Zylinder 2, 3 eine eigene Steueranordnung vorzusehen. Je nach Schwerpunktlage der Bohle 41 kann es beispielsweise notwendig sein, den einen Hydraulikzylinder 2 zu entlasten und gleichzeitig den anderen Hydraulikzylinder 3 zu belasten.The control arrangement according to the invention described acts in parallel on both hydraulic cylinders 2 and 3. This is sufficient for the majority of applications, especially in the small pavers. Be heavy machines, especially with Bohleverbreiterungen, it may be useful to separately provide the control arrangement according to the invention for each hydraulic cylinder 2, 3, so that each cylinder 2, 3 is controlled separately. In particular, when the screed 41 is not symmetrically widened and thus the center of gravity of the screed 41 is no longer exactly between the two hydraulic cylinders 2, 3, it is advantageous instead of a parallel control of the cylinders 2, 3 via a control arrangement according to the invention for each cylinder 2, 3 to provide a separate control arrangement. Depending on the center of gravity of the screed 41, it may be necessary, for example, to relieve the one hydraulic cylinder 2 and at the same time load the other hydraulic cylinder 3.

Figur 9 zeigt eine alternative Ausführungsform der erfindungsgemäßen Steueranordnung. Sie unterscheidet sich von der in Figuren 1 bis 8 gezeigten, ersten Ausführungsform dadurch, dass die Ventile 14 und 16 der ersten Ausführungsform durch ein 3/3-Wegeventil 14a ersetzt worden sind. Auch hierbei kann wahlweise, dem aktuellen Fahrzustand entsprechend, die Bohle 41 be- oder entlastet werden. Die Vorteile gegenüber der ersten Ausführungsform liegen zum einen in der Verringerung der Anzahl von Bauteilen und zum anderen in der Vereinfachung der Schaltvorgänge, da beispielsweise zum "Andrücken" der Bohle 41, d. h. zusätzliche Ausübung von definiertem Belastungsdruck, anstelle von zwei Schaltvorgängen, nämlich Schalten von Ventilen 14 und 16, nur noch ein Schaltvorgang für Ventil 14a benötigt wird. In der gezeigten Stellung liegt der Betriebsmodus "Regeln und Entlasten" vor. Hierbei kann je nach Bedarf ein geregelter Entlastungsdruck auf die Kolbestangenseiten der Hydraulikzylinder 2, 3 gegeben werde, so dass die Bohle 41 sich in Richtung des Pfeiles 34 bewegen kann. FIG. 9 shows an alternative embodiment of the control arrangement according to the invention. It is different from the one in FIGS. 1 to 8 shown first embodiment in that the valves 14 and 16 of the first embodiment have been replaced by a 3/3-way valve 14a. Here, too, optionally, the Bohle 41 can be loaded or unloaded according to the current driving condition. The advantages over the first embodiment are on the one hand in the reduction the number of components and the other in the simplification of the switching operations, for example, for "pressing" the screed 41, ie additional exercise of defined load pressure, instead of two switching operations, namely switching valves 14 and 16, only one switching operation for valve 14a is needed. In the position shown, the operating mode "control and unloading" is present. In this case, as required, a regulated relief pressure on the Kolbestangenseiten the hydraulic cylinders 2, 3 will be given, so that the screed 41 can move in the direction of arrow 34.

Figur 10 zeigt eine weitere Ausführungsform der erfindungsgemäßen Steueranordnung. Im Vergleich zur in Figuren 1 bis 8 gezeigten Ausführungsbeispiel sind die 2/2-Wegeventile 14, 16 nicht mehr zumindest teilweise "in Reihe" sondern parallel angeordnet, wobei der Ausgang des Ventils 14 mit den Kolbenstangenseiten und der Ausgang des Ventils 16 mit den Kolbenseiten der Hydraulikzylinder 2, 3 verbunden sind. Es lässt sich auch mit dieser Ausführungsform wahlweise, entsprechend dem aktuellen Fahrzustand, die Bohle 41 be- oder entlasten. In der gezeigten Stellung liegt der über das Druckregelventil 15 geregelte Druck durch Betätigung des Ventils 16 an den Kolbenseiten der Hydraulikzylinder 2, 3 an, so dass die Bohle eine zusätzliche Kraft in Richtung des Pfeils 35 erfährt. FIG. 10 shows a further embodiment of the control arrangement according to the invention. Compared to in FIGS. 1 to 8 shown embodiment, the 2/2-way valves 14, 16 are no longer at least partially "in series" but arranged in parallel, the output of the valve 14 to the piston rod sides and the output of the valve 16 to the piston sides of the hydraulic cylinders 2, 3 are connected. It can also be with this embodiment optionally, according to the current driving condition, the Bohle 41 load or relieve. In the position shown, the pressure regulated by the pressure regulating valve 15 is applied to the piston sides of the hydraulic cylinders 2, 3 by actuation of the valve 16, so that the screed experiences an additional force in the direction of the arrow 35.

Figur 11 zeigt eine erste Ausführungsform eines Steuersystems 100 mit zwei erfindungsgemäßen Steueranordnungen 1, 1'. Sie sind in der Weise parallel geschaltet, als dass sie als gemeinsame Komponenten lediglich das Wegeventil 11, die Rückschlagventile 21, 22 sowie die Anschlüsse 5, 6 und 6a haben. Die zweite Steueranordnung 1' stellt ansonsten eine Verdopplung der ersten Steueranordnung 1 mit den gleichen Komponenten dar. Die beiden Steueranordnungen 1, 1' weisen unter anderem separat voneinander betätigbare Druckregelventile 15, 15' sowie Betätigungszylinder 2, 3. Somit ist es möglich, unterschiedliche Entlastungsdrücke in den Zylindern 2, 3 einzustellen. Dies ist beispielsweise erforderlich, wenn infolge der asymmetrischen Verbreiterung der Bohle 41 die Gewichtsverteilung nicht symmetrisch bezüglich der Mittelachse der Hauptbohle 41 ist. Die separat geregelten Drücke werden jeweils über die Manometer 60, 60' angezeigt. Die Drucksensoren 50, 50' erfassen die jeweiligen Drücke auf der Kolbenseite der Hydraulikzylinder 2, 3. Diese Drücke eignen sich hervorragend als Parameter zur Regelung der Bohlenlast. Dank der doppelten Stromregler 40, 40' mit jeweils zwei Stromreglern 40a, 40b wird auch bei einseitig ausgefahrener Bohle 41 ein gleichmäßiges Heben und Senken der Bohle 41 möglich. FIG. 11 shows a first embodiment of a control system 100 with two control arrangements 1, 1 'according to the invention. They are connected in parallel in such a way that they have as common components only the directional control valve 11, the check valves 21, 22 and the terminals 5, 6 and 6a. The second control arrangement 1 'otherwise represents a doubling of the first control arrangement 1 with the same components. The two control arrangements 1, 1' have inter alia separately operable pressure control valves 15, 15 'and actuating cylinders 2, 3. Thus, it is possible different discharge pressures in the cylinders 2, 3 set. This is necessary, for example, if, as a result of the asymmetric widening of the screed 41, the weight distribution is not symmetrical with respect to the central axis of the main screed 41. The separately controlled pressures are indicated in each case via the pressure gauges 60, 60 '. The pressure sensors 50, 50 'detect the respective pressures on the piston side of the hydraulic cylinders 2, 3. These pressures are ideal as parameters for controlling the screed load. Thanks to the double current regulator 40, 40 ', each with two current regulators 40a, 40b, a uniform lifting and lowering of the screed 41 is possible even if the screed 41 is extended on one side.

Figur 12 zeigt ein weiteres Ausführungsbeispiel des erfindungsgemäßen Steuersystems 100. Im Vergleich zur in Fig. 11 gezeigten Ausführungsform verfügt das Steuersystem 100 über die Möglichkeit des zusätzlichen Andrückens der Bohle 41 mit Hilfe von zusätzlichen Belastungsdrücken, die über die Ventile 16, 16' auf die Kolbenseiten der Zylinder 2, 3 eingeleitet werden können (vergleichbar mit Fig. 10). Diese Andrückfunktion ist für die meisten Ausführungsformen nicht erforderlich, solange sich der Gesamtschwerpunkt der Bohle 41 zwischen den Anlenkpunkten der beiden Zylinder 2, 3 befindet. Sollte jedoch konstruktionsbedingt der Schwerpunkt außerhalb liegen, dann kann über das zusätzliche Andrücken für eine eben und gleichmäßige Lastenverteilung gesorgt werden. In Figur 12 ist eine Regelpumpe 101 dargestellt, die für einen geregelten Volumenstrom bzw. Druck sorgt. Damit kann der Volumenstrom bzw. der Druck dem Bedarf entsprechend geregelt werden. Dies führt zu einer verlustarmen und effizienten Betriebsweise der hydraulischen Steueranordnung 1 bzw. des Steuersystems 100. Mit Hilfe des Regelventils 102 kann der durch den Punkt 103 strömende Volumenstrom des Hydrauliköls geregelt werden. FIG. 12 shows a further embodiment of the control system 100 according to the invention. Compared to in Fig. 11 In the embodiment shown, the control system 100 has the possibility of additional pressing of the screed 41 with the aid of additional load pressures, the can be introduced via the valves 16, 16 'on the piston sides of the cylinder 2, 3 (comparable to Fig. 10 ). This pressing function is not required for most embodiments, as long as the overall center of gravity of the screed 41 between the articulation points of the two cylinders 2, 3 is located. However, if the center of gravity lies outside due to the design, then additional pressure can be used to ensure even and even load distribution. In FIG. 12 a control pump 101 is shown, which ensures a regulated volume flow or pressure. Thus, the flow or the pressure can be regulated according to demand. This leads to a low-loss and efficient operation of the hydraulic control arrangement 1 and the control system 100. With the aid of the control valve 102, the volume flow of the hydraulic oil flowing through the point 103 can be regulated.

Das Regelventil 102 kann auch zur Regelung des Drucks ausgelegt sein. Wie in Fig. 12 gezeigt, kann am Punkt bzw. Knoten 103 eine Rücklaufleitung eines weiteren Verbrauchers (nicht gezeigt) angeschlossen sein.The control valve 102 may also be designed to control the pressure. As in Fig. 12 shown, at the point or node 103, a return line of another consumer (not shown) may be connected.

Figur 13 zeigt schematisch eine Ansicht auf die Bohle 41 bei ungleichmäßiger Gewichtsverteilung. Die Bohle 41 umfasst eine Grund- bzw. Hauptbohle 1001 und zwei Bohlenverbreiterungen 1002 und 1003, welche über die Verfahrzylinder 1008 oder 1009 hydraulisch einzeln ausfahrbar sind. Zusätzlich können je nach Bedarf weitere Zusatzbohlen 1004 bis 1007 zur Verbreiterung der Arbeitsbreite an die Bohlenverbreiterungen 1002, 1003 angeschraubt werden. Die als doppeltwirkende Hydraulikzylinder ausgeführte Betätigungszylinder 2 und 3 sind auf je einer Seite einer Grundbohle 1001 mit jeweils gleichem Abstand von der Symmetrieachse 1015 entfernt angelenkt. Bei symmetrischer Verbreiterung der Bohle 41 liegt der Gesamtschwerpunkt der Bohle 41 auf der Symmetrielinie 1015. In diesem Fall würden die Zylinder 2 und 3 vorzugsweise mit gleichem Be-und Entlastungsdruck versorgt werden. Es gibt allerdings Einbausituationen, in denen eine unsymmetrische Verbreiterung der Bohle 41 vorteilhaft ist, wie in Figur 13 gezeigt ist. In diesem Fall verschiebt sich der Gesamtschwerpunkt 1010 der Bohle 41 um eine Länge 1012 nach rechts, so dass auch die Wirkungslinie der Gewichtskraft 1011 der Bohle 41 um die Länge 1012 von der Symmetrieachse 1015 verschoben ist. Um der ungleichmäßigen Gewichtsverteilung und damit zusammenhängendem ungleichmäßigem Einbau von Asphalt entgegenzuwirken, werden erfindungsgemäß Wegmessvorrichtungen 1013, 1014 vorgesehen, die jeweils an einem der Verfahrzylinder 1008, 1009 angeordnet sind und genau angeben, um welchen Betrag die Kolbenstangen der Verfahrzylinder 1008, 1009 ausgefahren sind. Aus den gemessenen Werten kann die Verschiebung 1012 des Schwerpunktes 1010 exakt ermittelt werden. Erfindungsgemäß werden die Betätigungszylinder 2, 3 bei ungleichmäßiger Gewichtsverteilung aufgrund von unsymmetrischer Bohlenverbreiterung unabhängig voneinander betätigt, so dass insgesamt eine gleichmäßige, ebene Verteilung und Verdichtung des Materials erreicht wird. So könnte beispielsweise der rechte Zylinder 2 die rechte Seite der Grundbohle 1001 leicht anheben, um einer Neigung infolge der Verschiebung 1012 des Schwerpunktes 1011 zu entgegnen. Es ist auch denkbar, über den linken Zylinder 3 die linke Seite der Grundbohle 1001 auf das zu verlegende Material zu drücken. Es ist selbstverständlich auch möglich, beide Maßnahmen gleichzeitig auszuführen. FIG. 13 schematically shows a view of the screed 41 with uneven weight distribution. The screed 41 comprises a main screed 1001 and two screed spacers 1002 and 1003, which are hydraulically extendable individually via the traversing cylinders 1008 or 1009. In addition, depending on requirements, additional additional planks 1004 to 1007 can be screwed to the spreader extensions 1002, 1003 to widen the working width. The actuating cylinders 2 and 3 designed as double-acting hydraulic cylinders are articulated on one side of a base beam 1001 at the same distance from the axis of symmetry 1015. With symmetrical widening of the screed 41, the overall center of gravity of the screed 41 lies on the symmetry line 1015. In this case, the cylinders 2 and 3 would preferably be supplied with the same loading and unloading pressure. However, there are installation situations in which an asymmetrical broadening of the screed 41 is advantageous, as in FIG. 13 is shown. In this case, the center of gravity 1010 of the screed 41 shifts to the right by a length 1012, so that the line of action of the weight force 1011 of the screed 41 is also shifted by the length 1012 from the axis of symmetry 1015. In order to counteract the uneven weight distribution and the associated non-uniform installation of asphalt, Wegmessvorrichtungen 1013, 1014 are provided according to the invention, which are each arranged on one of the Verfahrzylinder 1008, 1009 and specify exactly what amount the piston rods of the Verfahrzylinder 1008, 1009 are extended. From the measured values, the displacement 1012 of the center of gravity 1010 can be determined exactly. According to the invention, the actuating cylinders 2, 3 with uneven weight distribution due to asymmetric Bohlenverbreiterung independent operated from each other, so that an overall uniform, even distribution and compression of the material is achieved. For example, the right cylinder 2 could slightly raise the right side of the ground pile 1001 to counteract inclination due to the displacement 1012 of the center of gravity 1011. It is also conceivable to press the left side of the base pile 1001 over the left cylinder 3 on the material to be laid. It is of course also possible to carry out both measures simultaneously.

Claims (10)

  1. Hydraulic control arrangement (1) for activating an actuating cylinder (2) which is connected on the piston side to a road finisher (40) and on the piston rod side to a screed (41) of the road finisher (40), with a supply connection (5), a tank connection (6) and two consumer connections (7, 8), a loading pressure or a relief pressure being applied to the piston (2b) of the actuating cylinder (2) via the consumer connections (7, 8),
    characterized in that
    the actuating cylinder is double-acting,
    the loading pressure and the relief pressure can be controlled as a function of a defined operating state, the hydraulic control arrangement (1) being embodied in such a way that, in a "controlling the screed load" operating state, the relief pressure supplied to the actuating cylinder (2) on the piston rod side is controlled via a proportional pressure control valve (15).
  2. Hydraulic control arrangement (1) according to claim 1,
    characterized in that
    the hydraulic control arrangement (1) is embodied in such a way that, in a "lowering the screed" operating state, the hydraulic oil issuing on the piston rod side and entering the hydraulic control arrangement (1) via the second consumer connection (8) is returned to the piston side of the actuating cylinder (2) via the first consumer connection (7).
  3. Hydraulic control arrangement (1) according to any one of the preceding claims,
    characterized in that
    the hydraulic control arrangement (1) is embodied in such a way that, in the "lowering the screed" operating state, the hydraulic oil is supplied from a tank to the piston side of the actuating cylinder (2) via a further external or internal tank connection (6a).
  4. Hydraulic control arrangement (1) according to any one of the preceding claims,
    characterized in that
    it (1) comprises a double flow controller (40).
  5. Hydraulic control arrangement (1) according to any one of the preceding claims,
    characterized in that
    it (1) comprises a pressure sensor (50) which is embodied to detect the piston rod-side pressure or piston-side pressure, the loading pressure or relief pressure being controlled as a function of the detected piston rod-side pressure and/or piston-side pressure.
  6. Hydraulic control arrangement (1) according to any one of the preceding claims,
    characterized in that
    the volumetric flow of hydraulic oil which is conducted to the hydraulic control arrangement (1) via the supply connection (5) or the supply pressure being present at the supply connection (5) is controllable in a low-loss way by a control pump (101).
  7. Control system (100) with two hydraulic control arrangements (1, 1') according to any one of the preceding claims,
    characterized in that
    it (100) comprises two double-acting hydraulic cylinders (2, 3) which on the piston rod side are connected to the screed (41) so as to oppose one another with respect to a symmetry axis of the screed (41), wherein they (2, 3) can be controlled independently of one another.
  8. Control system (100) according to claim 7,
    characterized in that
    the volumetric flow of hydraulic oil which is conducted to the control system (100) via the supply connection (5) or the supply pressure being present at the supply connection (5) is controllable in a low-loss way by the control pump (101).
  9. A road finisher comprising a hydraulic control arrangement (1) or a control system (100) according to any one of the preceding claims.
  10. Road finisher according to claim 9,
    characterized in that
    the road finisher comprises distance measuring devices (1013, 1014) with which a widening of the screed (41) can be determined quantitatively.
EP10002445.4A 2009-03-09 2010-03-09 Hydraulic control assembly for the screed of a road finisher Active EP2233641B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009012384 2009-03-09
DE102009019839A DE102009019839A1 (en) 2009-03-09 2009-05-04 Hydraulic control arrangement for the screed of a road paver

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EP2233641A2 EP2233641A2 (en) 2010-09-29
EP2233641A3 EP2233641A3 (en) 2012-03-28
EP2233641B1 true EP2233641B1 (en) 2013-07-10
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Also Published As

Publication number Publication date
EP2233641B2 (en) 2017-03-01
DE102009019839A1 (en) 2010-09-16
EP2233641A2 (en) 2010-09-29
US9267248B2 (en) 2016-02-23
CN101831860B (en) 2013-08-28
EP2233641A3 (en) 2012-03-28
CN101831860A (en) 2010-09-15
US20100284742A1 (en) 2010-11-11

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