EP2644775A2 - Self-propelled milling machine, use of a lifting column of a milling machine, and method for increasing the efficiency of a milling machine - Google Patents
Self-propelled milling machine, use of a lifting column of a milling machine, and method for increasing the efficiency of a milling machine Download PDFInfo
- Publication number
- EP2644775A2 EP2644775A2 EP20130159176 EP13159176A EP2644775A2 EP 2644775 A2 EP2644775 A2 EP 2644775A2 EP 20130159176 EP20130159176 EP 20130159176 EP 13159176 A EP13159176 A EP 13159176A EP 2644775 A2 EP2644775 A2 EP 2644775A2
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- EP
- European Patent Office
- Prior art keywords
- milling machine
- work roll
- lifting
- lifting columns
- self
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- Granted
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- 238000003801 milling Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000000725 suspension Substances 0.000 claims description 21
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 239000003381 stabilizer Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims 1
- 238000013016 damping Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Classifications
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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
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
- E01C23/122—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus
- E01C23/127—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus rotary, e.g. rotary hammers
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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
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
- E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
- E01C23/088—Rotary tools, e.g. milling drums
Definitions
- the invention relates to a self-propelled milling machine, in particular a road milling machine, a stabilizer, a recycler or a surface miner for processing road or ground surfaces according to the preamble of claim 1, and the use of lifting columns of a milling machine according to the preamble of claim 10, and a Method for increasing the working efficiency of a milling machine according to the preamble of claim 12.
- a self-propelled road milling machine with the features of the preamble of claim 1 is for example from the EP 0 916 004 known.
- the road milling machine described therein has a chassis with front and rear suspension axles in the direction of travel, each chassis axle having two drives which may consist of wheel drives and / or crawler tracks.
- a suspension axle preferably the front, has only a single drive for smaller machines.
- the chassis carries the machine frame via lifting columns on at least two drives of a chassis axle.
- the EP 0 916 004 has at least the rear suspension axle lifting columns, and at least one of the drives the rear suspension axle is pivotable in a retracted position for edge-near milling.
- the work roll in the direction of travel between stored on the rear drives.
- the work roll may be between the front and rear drives, or even behind the rear drives in the direction of travel.
- the milling depth of the work roll can be changed using the lifting columns. It is understood that the work roll can also be adjusted in height independently of the machine frame.
- the control station of the milling machine is located above the rear suspension axle.
- the control station can also be provided at another location on the machine frame, for example in the direction of travel between the suspension axles or behind the rear suspension axle.
- the milling machine can also be designed without a control station, wherein the milling machine is remotely operated by a driver.
- the invention is therefore based on the object to increase the work efficiency in a milling machine mentioned above, and to provide a method for increasing the working efficiency of a milling machine.
- the invention provides in an advantageous manner that the work roll is adjustable in a position for driving with raised work roll and the lifting columns are coupled in the set position with a spring means.
- the invention makes it possible in an advantageous manner to couple the lifting columns for driving operation with raised work roll with a spring device, so that between the machine frame and the lifting columns can act a spring device.
- the lifting columns previously used only for height adjustment of the machine frame are structurally modified in such a way that a suspension is made possible instead of the height adjustment.
- the structural change to the lifting columns is inexpensive and space-saving executable, wherein the spring device can also be integrated into the lifting column.
- the invention provides a new functionality of the lifting columns without increased space requirements and without high design or equipment expense.
- the lifting columns allow suspension in such a way that the milling machine can be moved in pure driving without intervention of the work roll at much higher speeds without the machine and the driver is subjected to increased loads.
- the milling machine can be moved with far more than the previously maximum possible travel speed, so that when moving the milling machine to another site a considerable time savings arises that significantly increases the working efficiency of the milling machine.
- the spring device may be a mechanical or a hydraulic spring device.
- a mechanical spring device this is arranged between the drive and the machine frame in series with the lifting column, wherein the spring device is mechanically blocked in the milling operation of the work roll.
- a hydraulic spring device this is hydraulically locked in the milling operation of the work roll.
- the lifting column comprises a hydraulic piston-cylinder unit containing a piston movable in a cylinder which divides the cylinder of the piston-cylinder unit into an upper cylinder chamber and a lower cylinder chamber.
- the cylinder is rigidly connected to the machine frame and the piston is rigidly connected to the drive.
- the cylinder chambers can be coupled via at least one controllable valve with the hydraulic spring device.
- Such a hydraulic circuit makes it possible to use the lifting columns for cushioning the machine frame.
- the spring device preferably has a diaphragm accumulator.
- a diaphragm accumulator is connected for spring operation with the cylinder chambers of the piston-cylinder unit of the lifting column.
- the at least one controllable valve is closed during operation and is opened during driving without use of the work roll after reaching a predetermined lifting height of the lifting column.
- the coupling with the spring device when reaching a preset lifting height of the lifting columns can also be done automatically.
- the rear lifting columns in the direction of travel can be coupled to the at least one spring device.
- the lifting columns can each be coupled with one or more spring devices. Alternatively, all lifting columns can be coupled with at least one common spring device.
- the lifting columns known in self-propelled milling machines can be used for cushioning shocks that occur when moving the milling machine while driving, when the work roll is disengaged by the lifting column is coupled with a spring device.
- the piston-cylinder unit used for height adjustment can be used for suspension by the cylinder chambers are coupled alternatively via at least one controllable valve with a hydraulic spring device.
- Fig. 1 shown self-propelled milling machine is a road milling machine 1 with a machine frame 3, which is supported by a chassis 2 with front in the direction of travel 18 and rear suspension axles 4.6 with a total of at least three drives 8.
- the drives 8 may be wheel drives 14 or track drives, wheel drives 14 and track drives may also be present together.
- the front drives 8 are steerable.
- the rear drives 8 may also be steerable.
- a work roll 12 is carried by the machine frame 3, wherein the milling depth can be adjusted by means of lifting columns 10 with rigid storage of the work roll 12 on the machine frame 3. If the work roll 12 itself mounted vertically adjustable on the machine frame 3, the lifting columns are used only for adjusting the distance of the machine frame 3 from the road or ground surface 5. In the raised position of the work roll 12, this has a distance from the road or ground surface 5, which also allows a deflection of the chassis 2, without the work roll 12 is damaged.
- Fig. 1 shows the position of the drive 8 in normal operation.
- the drive 8 can be pivoted for the edge-flush milling in a position located within the contours of the machine frame 3 position, as is apparent from Fig. 2 is removable. In this case, can be milled with close to an obstacle with the front side of the work roll 12.
- the pivotable drive 8 can be steered, in particular in the pivoted position.
- the work roll 12 can also be arranged between the suspension axles 4, 6, or even in the direction of travel 18 behind the rear suspension axle 6.
- the lifting column 10 has two telescopically adjustable tubes, wherein the outer tube 44 is fixed to the machine frame 3 and the inner tube 46 to the drive 8.
- the inner tube 46 can slide almost free of play telescopically in the outer tube 44 and can be secured against rotation.
- a piston-cylinder unit 20 is arranged, the cylinder 25 is connected to the outer tube 44 and the piston 26 is fixed to the drive 8.
- a height adjustment of the machine frame 3 can be made by displacing the outer tube 44 connected to the machine frame 3 relative to the inner tube 46 and the drive 8.
- Fig. 4 shows the hydraulic circuit diagram for coupling the piston-cylinder unit 20 to a spring device 14 and a spring / damping device 14th
- the milling machine has at its control panel a height adjustment valve 32, with which the Lifting column 10 can be adjusted in height.
- the height adjustment valve 32 is a 4/3-way valve, so that depending on the switching position of the height adjustment valve 32, the upper cylinder chamber 22 is pressurized and the lower cylinder chamber 24 can be relieved of pressure, or vice versa.
- the lifting column 10 is raised, lowered in the second case.
- the middle position of the height adjustment valve 32 the lines leading to the cylinder chambers 22 and 24 are blocked, so that the lifting column 10 is locked in position.
- the milling operation takes place. It is essential that the chassis is absolutely rigid during the milling operation and does not allow suspension. All lifting columns 10 are therefore absolutely locked, so that the milling depth can be maintained to the millimeter, despite the heavy weight of the milling machine.
- a driving operation with raised work roll 12 are introduced after the work roll 12 has been brought by its own height adjustment or by the lifting columns 10 in a raised position, the cylinder chambers 22,24 can be connected to a diaphragm accumulator 34, when the simultaneously switched valves 30,36 are open. Due to the compressive elasticity of the diaphragm accumulator 34, the pressure in the cylinder chambers 22, 24 can now fluctuate, so that a suspension is made possible.
- the diaphragm accumulator 34 contains a sufficient operating pressure in order, on the one hand, to bear the machine weight and, on the other hand, to allow a certain oscillation of the piston 26 in the piston-cylinder unit 20.
- the leading to the diaphragm accumulator 34 line is blocked with a check valve 35 in the return direction, which is bridged by a throttle 38, so that the pressure reduction in the diaphragm accumulator 34 is slowed down via the throttle 38. Due to this, the spring device 14 also has damping properties, so that a spring / damping device is formed.
- the second switching valve 36 also has a throttle 48, which prevents a jerky pressure equalization between the cylinder chambers 22 and 24 in the open position of the switching valve 36.
- the switching valve 36 is connected between the leading to the cylinder chambers 22 and 24 hydraulic pressure lines, thus bridging the of the Height adjustment valve 32 to the piston-cylinder unit 20 leading hydraulic pressure lines.
- the hydraulic pressure line leading to the diaphragm accumulator 34 branches off from one of the hydraulic pressure lines leading to the cylinder chambers 22, 24.
- the switching valves 30,36 simultaneously release the pressure flow in the open position and block the flow in both directions in the closed position. With the help of the simultaneously switched double valve 30,36, the function of the lifting columns 10 can be changed from a height adjustment to a suspension and vice versa.
- the simultaneously switched double valve 30,36 is transferred to its closed position, whereupon the lifting columns 10 can be operated as usual with the height adjustment valve 32.
- the double valve 30,36, the check valve 35 and the throttle 38 may form a structural unit. This can, as of Fig. 1 can be arranged within the outer tube 44 of the lifting column 10.
- Fig. 4 shows a further embodiment, which is only to the effect of the embodiment of the Fig. 3 differentiates that the throttles are now variably adjustable, as based on the adjustable throttles 40,42 in Fig. 4 is apparent.
- the adjustable throttles 40,42 make it possible to adapt the damping properties to the local conditions of the road or ground surfaces or to the desired ride comfort.
- the coupling of the lifting columns 10 with a spring device 14 or a spring / damping device makes it possible to convert the lifting columns 10 themselves to a suspension, so that due to the now resulting spring and damping properties higher travel speeds of, for example, more than 12 km / h, preferably more than 15 km / h can be achieved.
- the relocation of the milling machine to another site can be accomplished in a significantly shorter time, making the overall work efficiency of the milling machine can be significantly improved.
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Abstract
Description
Die Erfindung betrifft eine selbstfahrende Fräsmaschine, insbesondere eine Straßenfräsmaschine, einen Stabilisierer, einen Recycler oder einen Surface Miner zum Bearbeiten von Straßen- oder Bodenoberflächen nach dem Oberbegriff des Anspruchs 1, sowie die Verwendung von Hubsäulen einer Fräsmaschine nach dem Oberbegriff des Anspruchs 10, und ein Verfahren zum Erhöhen der Arbeitseffektivität einer Fräsmaschine nach dem Oberbegriff des Anspruchs 12.The invention relates to a self-propelled milling machine, in particular a road milling machine, a stabilizer, a recycler or a surface miner for processing road or ground surfaces according to the preamble of
Eine selbstfahrende Straßenfräsmaschine mit den Merkmalen des Oberbegriffs des Anspruchs 1 ist beispielsweise aus der
Bei derartigen selbstfahrenden Fräsmaschinen, ist es insbesondere bei der Reparatur von Straßen- oder Bodenoberflächen häufig erforderlich, den Fräsbetrieb nur für eine kurze Fahrstrecke auszuführen und die Maschine dann an einen anderen Einsatzort zu versetzen, wobei eine größere Fahrstrecke ohne Fräsbetrieb absolviert werden muss. Die Konstruktion der Fräsmaschinen lässt hierbei nur eine geringe Fahrgeschwindigkeit von in der Regel ca. 5 km/h zu, da die im Fahrbetrieb entstehenden Schwingungen die mechanischen Komponenten der Fräsmaschine beschädigen können, oder zumindest deren Standzeit reduzieren können. Desweiteren sind diese Schwingungen auch für einen Fahrzeugführer unangenehm. Aufgrund der langsamen Geschwindigkeit beim Verfahren der Fräsmaschine zu einem neuen Einsatzort wird die Arbeitseffektivität der Fräsmaschine beschränkt.In such self-propelled milling machines, it is often necessary, in particular in the repair of road or ground surfaces, to perform the milling operation only for a short distance and then move the machine to another location, with a larger distance without milling must be completed. The design of the milling machines in this case allows only a low driving speed of usually about 5 km / h, since the vibrations generated during driving can damage the mechanical components of the milling machine, or at least reduce their service life. Furthermore, these vibrations are also uncomfortable for a driver. Due to the slow speed of moving the milling machine to a new location, the working efficiency of the milling machine is limited.
Der Erfindung liegt demzufolge die Aufgabe zugrunde, bei einer eingangs genannten Fräsmaschine die Arbeitseffektivität zu erhöhen, sowie ein Verfahren zum Erhöhen der Arbeitseffektivität einer Fräsmaschine anzugeben.The invention is therefore based on the object to increase the work efficiency in a milling machine mentioned above, and to provide a method for increasing the working efficiency of a milling machine.
Zur Lösung dieser Aufgabe dienen die Merkmale der Ansprüche 1, 10 und 12.To achieve this object are the features of
Die Erfindung sieht in vorteilhafter Weise vor, dass die Arbeitswalze in eine Position für den Fahrbetrieb mit angehobener Arbeitswalze verstellbar ist und die Hubsäulen in der eingestellten Position mit einer Federeinrichtung koppelbar sind.The invention provides in an advantageous manner that the work roll is adjustable in a position for driving with raised work roll and the lifting columns are coupled in the set position with a spring means.
Die Erfindung ermöglicht es in vorteilhafter Weise, die Hubsäulen für den Fahrbetrieb mit angehobener Arbeitswalze mit einer Federeinrichtung zu koppeln, so dass zwischen den Maschinenrahmen und den Hubsäulen eine Federeinrichtung wirken kann. Mit anderen Worten, die bisher nur zur Höhenverstellung des Maschinenrahmens verwendeten Hubsäulen werden konstruktiv derart modifiziert, dass anstelle der Höhenverstellung eine Federung ermöglicht wird.The invention makes it possible in an advantageous manner to couple the lifting columns for driving operation with raised work roll with a spring device, so that between the machine frame and the lifting columns can act a spring device. In other words, the lifting columns previously used only for height adjustment of the machine frame are structurally modified in such a way that a suspension is made possible instead of the height adjustment.
Die konstruktive Veränderung an den Hubsäulen ist kostengünstig und platzsparend ausführbar, wobei die Federeinrichtung auch in die Hubsäule integrierbar ist. Die Erfindung schafft eine neue Funktionalität der Hubsäulen ohne erhöhten Platzbedarf und ohne hohen konstruktiven oder apparativen Aufwand. Die Hubsäulen ermöglichen eine Federung derart, dass die Fräsmaschine im reinen Fahrbetrieb ohne Eingriff der Arbeitswalze mit erheblich höherer Fahrgeschwindigkeit bewegt werden kann, ohne dass die Maschine und der Fahrzeugführer erhöhten Belastungen ausgesetzt wird. Die Fräsmaschine kann mit weit mehr als der zuvor maximal möglichen Fahrgeschwindigkeit bewegt werden, so dass beim Versetzen der Fräsmaschine an einen anderen Einsatzort eine erhebliche Zeitersparnis entsteht, die die Arbeitseffektivität der Fräsmaschine deutlich erhöht.The structural change to the lifting columns is inexpensive and space-saving executable, wherein the spring device can also be integrated into the lifting column. The invention provides a new functionality of the lifting columns without increased space requirements and without high design or equipment expense. The lifting columns allow suspension in such a way that the milling machine can be moved in pure driving without intervention of the work roll at much higher speeds without the machine and the driver is subjected to increased loads. The milling machine can be moved with far more than the previously maximum possible travel speed, so that when moving the milling machine to another site a considerable time savings arises that significantly increases the working efficiency of the milling machine.
Die Federeinrichtung kann eine mechanische oder eine hydraulische Federeinrichtung sein. Im Falle einer mechanischen Federeinrichtung ist diese zwischen dem Laufwerk und dem Maschinenrahmen in Reihe mit der Hubsäule eingerichtet, wobei die Federeinrichtung im Fräsbetrieb der Arbeitswalze mechanisch blockiert ist. Im Falle einer hydraulischen Federeinrichtung wird diese im Fräsbetrieb der Arbeitswalze hydraulisch gesperrt.The spring device may be a mechanical or a hydraulic spring device. In the case of a mechanical spring device, this is arranged between the drive and the machine frame in series with the lifting column, wherein the spring device is mechanically blocked in the milling operation of the work roll. In the case of a hydraulic spring device this is hydraulically locked in the milling operation of the work roll.
Vorzugsweise weist die Hubsäule eine hydraulische Kolben-Zylindereinheit auf, die einen in einem Zylinder beweglichen Kolben enthält, der den Zylinder der Kolbenzylindereinheit in eine obere Zylinderkammer und eine untere Zylinderkammer unterteilt. Dabei ist der Zylinder starr mit dem Maschinenrahmen verbunden und der Kolben starr mit dem Laufwerk.Preferably, the lifting column comprises a hydraulic piston-cylinder unit containing a piston movable in a cylinder which divides the cylinder of the piston-cylinder unit into an upper cylinder chamber and a lower cylinder chamber. The cylinder is rigidly connected to the machine frame and the piston is rigidly connected to the drive.
Bei einer bevorzugten Weiterbildung der Erfindung ist vorgesehen, dass die Zylinderkammern über mindestens ein ansteuerbares Ventil mit der hydraulischen Federeinrichtung koppelbar sind. Eine derartige hydraulische Schaltung ermöglicht es, die Hubsäulen zum Abfedern des Maschinenrahmens zu verwenden.In a preferred embodiment of the invention it is provided that the cylinder chambers can be coupled via at least one controllable valve with the hydraulic spring device. Such a hydraulic circuit makes it possible to use the lifting columns for cushioning the machine frame.
Die Federeinrichtung weist vorzugsweise einen Membranspeicher auf. Ein derartiger Membranspeicher ist für den Federbetrieb mit den Zylinderkammern der Kolben-Zylindereinheit der Hubsäule verbunden.The spring device preferably has a diaphragm accumulator. Such a diaphragm accumulator is connected for spring operation with the cylinder chambers of the piston-cylinder unit of the lifting column.
Vorzugsweise ist vorgesehen, dass das mindestens eine ansteuerbare Ventil während des Arbeitsbetriebes geschlossen ist und während des Fahrbetriebes ohne Einsatz der Arbeitswalze nach Erreichen einer vorgebbaren Hubhöhe der Hubsäule geöffnet ist. Dabei kann die Kopplung mit der Federeinrichtung bei Erreichen einer voreingestellten Hubhöhe der Hubsäulen auch automatisch erfolgen.It is preferably provided that the at least one controllable valve is closed during operation and is opened during driving without use of the work roll after reaching a predetermined lifting height of the lifting column. In this case, the coupling with the spring device when reaching a preset lifting height of the lifting columns can also be done automatically.
Bei einem Ausführungsbeispiel ist vorgesehen, dass die in Fahrtrichtung hinteren Hubsäulen mit der mindestens einen Federeinrichtung koppelbar sind.In one embodiment, it is provided that the rear lifting columns in the direction of travel can be coupled to the at least one spring device.
Die Hubsäulen können jeweils mit einer oder mehreren Federeinrichtungen koppelbar sein. Alternativ können alle Hubsäulen mit mindestens einer gemeinsamen Federeinrichtung koppelbar sein.The lifting columns can each be coupled with one or more spring devices. Alternatively, all lifting columns can be coupled with at least one common spring device.
Die bei selbstfahrenden Fräsmaschinen bekannten Hubsäulen können zum Abfedern von Stößen, die beim Versetzen der Fräsmaschine im Fahrbetrieb entstehen, verwendet werden, wenn die Arbeitswalze außer Eingriff ist, indem die Hubsäule mit einer Federeinrichtung gekoppelt wird. Die zur Höhenverstellung verwendete Kolbenzylindereinheit kann zur Federung verwendet werden, indem die Zylinderkammern alternativ über mindestens ein ansteuerbares Ventil mit einer hydraulischen Federeinrichtung gekoppelt werden.The lifting columns known in self-propelled milling machines can be used for cushioning shocks that occur when moving the milling machine while driving, when the work roll is disengaged by the lifting column is coupled with a spring device. The piston-cylinder unit used for height adjustment can be used for suspension by the cylinder chambers are coupled alternatively via at least one controllable valve with a hydraulic spring device.
Ein Verfahren zum Erhöhen der Arbeitseffektivität einer Fräsmaschine mit einer Arbeitswalze ist gekennzeichnet durch folgende Schritte:
- Anheben der Arbeitswalze in eine Position außer Eingriff mit der Straßen- oder Bodenoberfläche ist,
- Koppeln der Hubsäulen mit mindestens einer Federeinrichtung für den Fahrbetrieb ohne Eingriff der Arbeitswalze,
- Versetzen der Fräsmaschine an einen anderen Einsatzort mit einer erhöhten Fahrgeschwindigkeit im Fahrbetrieb ohne Eingriff der Arbeitswalze, und
- Sperren der Kopplung der Hubsäulen mit der Federeinrichtung für den Arbeitsbetrieb mit Eingriff der Arbeitswalze an dem neuen Einsatzort.
- Lifting the work roll to a position out of engagement with the road or ground surface,
- Coupling the lifting columns with at least one spring device for the driving operation without intervention of the work roll,
- Moving the milling machine to another location with an increased driving speed while driving without intervention of the work roll, and
- Blocking the coupling of the lifting columns with the spring device for the working operation with engagement of the work roll at the new site.
Im Folgenden werden unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert:
- Es zeigen:
- Fig. 1
- eine schematisch dargestellte Straßenfräsmaschine,
- Fig. 2
- eine Draufsicht auf die Straßenfräsmaschine,
- Fig. 3
- ein erstes Ausführungsbeispiel einer Federeinrichtung, und
- Fig. 4
- ein zweites Ausführungsbeispiel einer Federeinrichtung.
- Show it:
- Fig. 1
- a schematically illustrated road milling machine,
- Fig. 2
- a top view of the road milling machine,
- Fig. 3
- a first embodiment of a spring device, and
- Fig. 4
- A second embodiment of a spring device.
Die in
Eine Arbeitswalze 12 wird vom Maschinenrahmen 3 getragen, wobei bei starrer Lagerung der Arbeitswalze 12 am Maschinenrahmen 3 die Frästiefe mit Hilfe von Hubsäulen 10 eingestellt werden kann. Ist die Arbeitswalze 12 selbst höhenverstellbar am Maschinenrahmen 3 gelagert, dienen die Hubsäulen lediglich zur Einstellung des Abstandes des Maschinenrahmens 3 von der Straßen- oder Bodenoberfläche 5. In der angehobenen Position der Arbeitswalze 12 hat diese einen Abstand von der Straßen- oder Bodenoberfläche 5, der auch ein Einfedern des Fahrwerkes 2 zulässt, ohne dass die Arbeitswalze 12 beschädigt wird.A
Bei dem gezeigten Ausführungsbeispiel sind Hubsäulen 10 nur an der hinteren Fahrwerksachse 6 vorgesehen.
Bei anderen Ausführungsbeispielen einer selbstfahrenden Fräsmaschine kann die Arbeitswalze 12 auch zwischen den Fahrwerksachsen 4,6 angeordnet sein, oder sogar in Fahrtrichtung 18 hinter der hinteren Fahrwerksachse 6.In other embodiments of a self-propelled milling machine, the
Es versteht sich, dass auch alle Laufwerke 8 mit Hubsäulen 10 ausgestattet sein können.It is understood that all drives 8 can be equipped with lifting
Die Hubsäule 10 weist zwei teleskopisch ineinander verstellbare Rohre auf, wobei das Außenrohr 44 an dem Maschinenrahmen 3 und das Innenrohr 46 an dem Laufwerk 8 befestigt ist. Das Innenrohr 46 kann nahezu spielfrei teleskopisch in dem Außenrohr 44 gleiten und kann gegen Verdrehung gesichert sein. Im Inneren der Hubsäule 10 ist eine Kolbenzylindereinheit 20 angeordnet, deren Zylinder 25 mit dem Außenrohr 44 verbunden ist und deren Kolben 26 an dem Laufwerk 8 befestigt ist. Bei Betätigung der Kolbenzylindereinheit 20 kann durch Verschieben des mit dem Maschinenrahmen 3 verbundenen Außenrohrs 44 relativ zu dem Innenrohr 46 und dem Laufwerk 8 eine Höhenverstellung des Maschinenrahmens 3 vorgenommen werden.The lifting
Zunächst sei der normale Betrieb der Hubsäule 10 beschrieben. Hierzu besitzt die Fräsmaschine an ihrem Bedienpult ein Höhenverstellungsventil 32, mit dem die Hubsäule 10 höhenverstellt werden kann. Das Höhenverstellungsventil 32 ist ein 4/3-Wegeventil, so dass je nach Schaltstellung des Höhenverstellungsventils 32 die obere Zylinderkammer 22 mit Druck beaufschlagt und die untere Zylinderkammer 24 vom Druck entlastet werden kann, oder umgekehrt. Im ersten Fall wird die Hubsäule 10 angehoben, im zweiten Fall abgesenkt. In der Mittelstellung des Höhenverstellungsventils 32 sind die zu den Zylinderkammern 22 und 24 führenden Leitungen gesperrt, so dass die Hubsäule 10 in ihrer Position arretiert ist. In dieser Mittelstellung erfolgt der Fräsbetrieb. Es ist wesentlich, dass das Fahrwerk während des Fräsbetriebes absolut starr ist und keine Federung zulässt. Alle Hubsäulen 10 sind daher absolut arretiert, so dass die Frästiefe millimetergenau eingehalten werden kann, und zwar trotz des tonnenschweren Gewichtes der Fräsmaschine.First, the normal operation of the
Soll nunmehr ein Fahrbetrieb mit angehobener Arbeitswalze 12 eingeleitet werden, nachdem die Arbeitswalze 12 durch eine eigene Höhenverstelleinrichtung oder durch die Hubsäulen 10 in eine angehobene Position gebracht worden ist, können die Zylinderkammern 22,24 mit einem Membranspeicher 34 verbunden werden, wenn die gleichzeitig geschalteten Ventile 30,36 geöffnet sind. Aufgrund der Druckelastizität des Membranspeichers 34 kann nunmehr der Druck in den Zylinderkammern 22,24 schwanken, so dass eine Federung ermöglicht wird. Der Membranspeicher 34 enthält einen ausreichenden Betriebsdruck, um einerseits das Maschinengewicht zu tragen und andererseits ein gewisses Schwingen des Kolbens 26 in der Kolbenzylindereinheit 20 zuzulassen. Die zu dem Membranspeicher 34 führende Leitung ist mit einem Rückschlagventil 35 in Rückflussrichtung gesperrt, das von einer Drossel 38 überbrückt ist, so dass der Druckabbau im Membranspeicher 34 über die Drossel 38 verlangsamt ist. Aufgrunddessen hat die Federeinrichtung 14 auch Dämpfungseigenschaften, so dass eine Feder-/Dämpfungseinrichtung gebildet ist.Now, a driving operation with raised
Das zweite Schaltventil 36 weist ebenfalls eine Drossel 48 auf, die in der Öffnungsstellung des Schaltventils 36 einen ruckartigen Druckausgleich zwischen den Zylinderkammern 22 und 24 verhindert.The
Das Schaltventil 36 ist zwischen den zu den Zylinderkammern 22 und 24 führenden Hydraulik-Druckleitungen geschaltet und überbrückt damit die von dem Höhenverstellungsventil 32 zu der Kolbenzylindereinheit 20 führenden Hydraulik-Druckleitungen. Die zu dem Membranspeicher 34 führende Hydraulik-Druckleitung zweigt von einer der zu den Zylinderkammern 22,24 führenden Hydraulik-Druckleitungen ab. Die Schaltventile 30,36 geben in der Öffnungsstellung gleichzeitig den Druckfluss frei und sperren den Durchfluss in beide Richtungen in der Schließstellung. Mit Hilfe des gleichzeitig geschalteten Doppelventils 30,36 läßt sich die Funktion der Hubsäulen 10 von einer Höhenverstelleinrichtung zu einer Federung und umgekehrt verändern.The switching
Wird der Fahrbetrieb beendet, und soll ein Arbeitsbetrieb mit Eingriff der Arbeitswalze 12 eingeleitet werden, wird das gleichzeitig geschaltete Doppelventil 30,36 in seine Schließstellungstellung überführt, woraufhin die Hubsäulen 10 bei Bedarf wie gewohnt mit dem Höhenverstellungsventil 32 betätigt werden können.If the driving operation is terminated, and a working operation with engagement of the
Das Doppelventil 30,36, das Rückschlagventil 35 und die Drossel 38 können eine Baueinheit bilden. Diese kann, wie aus
Die Kopplung der Hubsäulen 10 mit einer Federeinrichtung 14 bzw. einer Feder-/Dämpfungseinrichtung ermöglicht es, die Hubsäulen 10 selbst zu einer Federung umzufunktionieren, so dass aufgrund der sich nunmehr ergebenden Feder- und Dämpfungseigenschaften höhere Fahrgeschwindigkeiten von beispielsweise mehr als 12 km/h, vorzugsweise mehr als 15 km/h erreicht werden können. Die Verlagerung der Fräsmaschine an einen anderen Einsatzort kann in erheblich kürzerer Zeit bewerkstelligt werden, wodurch insgesamt die Arbeitseffektivität der Fräsmaschine erheblich verbessert werden kann.The coupling of the lifting
Claims (15)
die Arbeitswalze (12) in eine Position für den Fahrbetrieb mit angehobener Arbeitswalze (12) verstellbar ist und die Hubsäulen (10) in der eingestellten Position der Arbeitswalze (12) mit Abstand von der Straßen- oder Bodenoberfläche (5) mit einer Federeinrichtung (14) koppelbar sind.Self-propelled milling machine, in particular road milling machine (1), stabilizer, recycler or surface miner for processing road or ground surfaces (5),
the work roll (12) is adjustable into a position for driving with the work roll (12) raised, and the lifting columns (10) in the adjusted position of the work roll (12) at a distance from the road or ground surface (5) with a spring means (14 ) can be coupled.
gekennzeichnet durch
die Verwendung der Hubsäule (10) zum Abfedern von Stößen, die beim Versetzen der Fräsmaschine im Fahrbetrieb entstehen, wenn die Arbeitswalze (12) außer Eingriff ist, durch Koppeln der Hubsäule (10) mit einer Federeinrichtung (14).Use of lifting columns of a milling machine, in particular a road milling machine (1), a stabilizer, a recycler, or a surface miner, for machining road or ground surfaces, in which the milling machine
marked by
the use of the lifting column (10) for cushioning impacts that occur when moving the milling machine while driving, when the work roll (12) is disengaged, by coupling the lifting column (10) with a spring device (14).
gekennzeichnet durch
marked by
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102012205005.1A DE102012205005B4 (en) | 2012-03-28 | 2012-03-28 | Self-propelled milling machine, use of a lifting column of a milling machine, as well as methods for increasing the working efficiency of a milling machine |
Publications (3)
Publication Number | Publication Date |
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EP2644775A2 true EP2644775A2 (en) | 2013-10-02 |
EP2644775A3 EP2644775A3 (en) | 2015-06-24 |
EP2644775B1 EP2644775B1 (en) | 2016-10-26 |
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EP13159176.0A Active EP2644775B1 (en) | 2012-03-28 | 2013-03-14 | Self-propelled milling machine, use of a lifting column of a milling machine, and method for increasing the efficiency of a milling machine |
Country Status (4)
Country | Link |
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US (1) | US9085857B2 (en) |
EP (1) | EP2644775B1 (en) |
CN (2) | CN203487443U (en) |
DE (1) | DE102012205005B4 (en) |
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CN103558852A (en) * | 2013-10-31 | 2014-02-05 | 北方重工集团有限公司 | Electronic control system for automatic walking and deviation rectification of hard-rock roadway mining machine |
EP3587668A1 (en) * | 2018-06-22 | 2020-01-01 | Wirtgen GmbH | Self-propelled construction machine and method for processing floor linings |
EP3767033A1 (en) * | 2019-07-18 | 2021-01-20 | Wirtgen GmbH | Self-propelled construction machine and method for processing floor coverings |
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DE102012205005B4 (en) * | 2012-03-28 | 2015-04-02 | Wirtgen Gmbh | Self-propelled milling machine, use of a lifting column of a milling machine, as well as methods for increasing the working efficiency of a milling machine |
CN103966940B (en) * | 2014-05-07 | 2015-12-30 | 中联重科股份有限公司 | A kind of milling machine and column up-down control device, system and method |
CN105369723B (en) * | 2014-08-20 | 2017-05-24 | 中联重科股份有限公司 | Control method, control equipment and control system of milling-planing machine, and milling-planing machine |
DE102015209740A1 (en) * | 2014-12-30 | 2016-06-30 | Wirtgen Gmbh | Self-propelled road milling machine for working on road surfaces, as well as methods for working on road surfaces with a road milling machine |
DE102015003153B4 (en) * | 2015-03-13 | 2019-03-28 | Wirtgen Gmbh | Self-propelled construction machine |
DE102016225189A1 (en) | 2016-12-15 | 2018-06-21 | Wirtgen Gmbh | Construction machine for the processing of a floor covering |
US20190136468A1 (en) * | 2017-11-07 | 2019-05-09 | Roadtec, Inc. | System for disabling milling drum of milling machine |
DE102019127745A1 (en) * | 2019-10-15 | 2021-04-15 | Wirtgen Gmbh | Self-propelled construction machine |
US11015305B1 (en) * | 2020-01-28 | 2021-05-25 | Caterpillar Paving Products Inc. | Milling machine having a hydraulic dampening system |
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-
2012
- 2012-03-28 DE DE102012205005.1A patent/DE102012205005B4/en not_active Expired - Fee Related
-
2013
- 2013-03-14 US US13/827,409 patent/US9085857B2/en active Active
- 2013-03-14 EP EP13159176.0A patent/EP2644775B1/en active Active
- 2013-03-28 CN CN201320148227.1U patent/CN203487443U/en not_active Expired - Lifetime
- 2013-03-28 CN CN201310104865.8A patent/CN103362059B/en active Active
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103558852A (en) * | 2013-10-31 | 2014-02-05 | 北方重工集团有限公司 | Electronic control system for automatic walking and deviation rectification of hard-rock roadway mining machine |
CN103558852B (en) * | 2013-10-31 | 2016-03-23 | 北方重工集团有限公司 | A kind of electric-control system of automatically walking for hard-rock tunnel Mars Miner and rectifying a deviation |
EP3587668A1 (en) * | 2018-06-22 | 2020-01-01 | Wirtgen GmbH | Self-propelled construction machine and method for processing floor linings |
US10968576B2 (en) | 2018-06-22 | 2021-04-06 | Wirtgen Gmbh | Self-propelled construction machine and method for working ground pavements |
EP3767033A1 (en) * | 2019-07-18 | 2021-01-20 | Wirtgen GmbH | Self-propelled construction machine and method for processing floor coverings |
US11346065B2 (en) | 2019-07-18 | 2022-05-31 | Wirtgen Gmbh | Self-propelled construction machine and method for working ground pavements |
Also Published As
Publication number | Publication date |
---|---|
US9085857B2 (en) | 2015-07-21 |
DE102012205005B4 (en) | 2015-04-02 |
CN203487443U (en) | 2014-03-19 |
EP2644775A3 (en) | 2015-06-24 |
DE102012205005A1 (en) | 2013-10-02 |
EP2644775B1 (en) | 2016-10-26 |
US20130257136A1 (en) | 2013-10-03 |
CN103362059B (en) | 2016-08-03 |
CN103362059A (en) | 2013-10-23 |
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