EP0217408A2 - Method and device for the height adjustment of a screed - Google Patents

Method and device for the height adjustment of a screed Download PDF

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Publication number
EP0217408A2
EP0217408A2 EP86113678A EP86113678A EP0217408A2 EP 0217408 A2 EP0217408 A2 EP 0217408A2 EP 86113678 A EP86113678 A EP 86113678A EP 86113678 A EP86113678 A EP 86113678A EP 0217408 A2 EP0217408 A2 EP 0217408A2
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EP
European Patent Office
Prior art keywords
screed
lifting
height
leveling
switched
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86113678A
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German (de)
French (fr)
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EP0217408A3 (en
EP0217408B1 (en
Inventor
Paul Dörr
Roland Dipl.-Ing. Grundl (Fh)
Alfred Dr.-Ing. Ulrich
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Joseph Voegele AG
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Joseph Voegele AG
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Application filed by Joseph Voegele AG filed Critical Joseph Voegele AG
Priority to AT86113678T priority Critical patent/ATE50010T1/en
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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
    • 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
    • E01C19/4866—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 with solely non-vibratory or non-percussive pressing or smoothing means for consolidating or finishing
    • E01C19/4873—Apparatus designed for railless operation

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the layer thickness is essentially determined by the angle of attack of the screed to the paving ground and its driving speed in connection with the flow and compaction behavior of the paving material. It is known to monitor the work result during the work process by means of suitable measuring devices and, if necessary, to regulate the height of the screed accordingly. When the machine is at a standstill, this vertical mobility of the floating suspension is locked down in such a way that the screed cannot sink below the predetermined height. This is particularly important if a stop is temporarily necessary during a commute, for example due to a halt in the supply of materials.
  • the height blockade is lifted when the journey begins again and the screed is floating on the thawing material again.
  • the first step is to get paving material that was brought to the screed immediately before the work trip was interrupted.
  • the flowability may have changed by cooling so that when the screed begins to move forward again, this counteracts and increases the stagnation resistance. He if it submits paving material with normal temperature and flowability as it moves further, it swims back to normal height.
  • the difference in layer thickness in the start-up area is clearly visible and must be compensated for by extensive rework.
  • the invention has for its object to provide a method of the type described, which automatically prevents approach height errors.
  • the screed which is blocked in its vertical movements in both directions, forms a rigid system with a fixed screed position during start-up with its suspension elements on the road construction machine .
  • the screed cannot move upwards even when there is increased backlog resistance.
  • the rigid system also allows her to overcome the increased congestion resistance, ie to strip off excess material.
  • the screed is lifted after the specified period of time, ie the screed is brought back into the floating position.
  • the choice of the time period results from the respective working conditions, ie the distance likely to be covered with material in front of the screed when the trip is stopped and the acceleration and speed of the road construction machine.
  • the height of the screed is regulated with a height leveling device according to a reference line during the working process, it can be ensured by the feature of claim 2 that no leveling movements, neither upwards nor downwards, take place during the starting process.
  • the leveling device is therefore not burdened by the increased storage resistance, but rather belongs to the rigid system.
  • the feature of claim 3 ensures the exact leveling and compaction work of the screed after the selected period of time. There is no transition area between the rigid height adjustment and the adjustable, floating pad, in which movable organs act on those that are still blocked.
  • the invention also provides a device for carrying out the method for a leveling and compaction screed, which is articulated on the one hand with the cantilevers on the road construction machine, on which leveling cylinders act for angle and height adjustment, and which is suspended for floating storage by means of lifting cylinders which are suitable for the floating working position must be kept open on both the lifting and pressure sides via a processing and valve system.
  • the height blocking of the screed according to the invention in the approach period is effected according to the feature of claim 4 via a control element which can be acted upon by the switch for the travel drive and which blocks the inlet and outlet lines of the lifting cylinders by means of valves and thus silently puts.
  • the floating position switches a timer after the selected period.
  • the feature of claim 5 makes it possible to carry out the method according to the feature of claim 3.
  • Leveling device and lifting cylinder form a rigid, height-fixed bandage during the selected time period, and then simultaneously assume their normal work mobility.
  • the feature of claim 6 addresses an advantageous further development of the device according to the invention.
  • the pressure relief valve prevents damage to the lifting cylinders and / or the screed in extreme cases, i.e. if the paving material should harden and / or be filled up abnormally during a particularly long standstill.
  • a leveling and compaction screed 2 is attached to a road construction machine designated as a whole by 1.
  • the connection between the screed 2 and the construction machine 1 is made by handlebars 3, each with its free end are attached to the side of the road construction machine at an attachment point 4.
  • the attachment points 4 can each be adjusted in height by means of leveling cylinders 5 in the sense of the double arrow A.
  • lifting cylinders 6 engaging the handlebars 3 are also arranged in the vicinity of the screed 2.
  • the lifting cylinders 6 are double-acting.
  • the road construction machine 1 After actuating a driving switch 7, moves in the direction of travel indicated by the arrow F.
  • Road material 8 is brought in front of the screed in the direction of travel, from which the screed forms a layer 9 of desired thickness by stripping and compacting.
  • the screed moves floating on the road building material 8, held by the lifting cylinders 6 open in both directions, i.e. with free piston movement up and down.
  • the desired layer thickness is monitored by a measuring device 10 arranged in the vicinity of the screed 2 on the road construction machine, which compares the height of the screed with a predetermined reference line 11. If there is a deviation, the measuring device acts on the leveling cylinders 5, which in turn adjust the attachment points 4 upwards or downwards. As a result, the angle of attack of the screed 2 changes via the boom 3.
  • a hydraulic line and valve system designated as a whole as 12, and its electrical control circuit 13 are shown schematically in FIG. 2.
  • the lifting cylinders 6 are connected via a four / three-way valve 15, a lifting line 16 and a lowering line 17.
  • a check valve 18 is arranged in the stroke line 16 and a two / two-way valve 19 is connected in parallel thereto.
  • a check valve 20 and, in parallel, a two / two-way valve 21 are connected in the lowering line 17.
  • a discharge line 22 branches off from the lowering line 17 between the valves and the reciprocating piston 6 and leads to a pressure limiting valve 23.
  • the electrical control circuit 13 can be acted upon by the driving switch 7.
  • a pulse line 24 is switched for the travel drive.
  • the valves are actuated via a control member 25.
  • a timer 26 is applied.
  • Fig. 2 shows the rest position, i.e. the driving switch 7 is not closed, the road construction machine is stopped. In this position, the two / two-way valve 19 in the lifting line 16 is closed. A return of the hydraulic fluid from the piston rod side of the cylinder to the hydraulic system is not possible, i.e. the lowering movement of the pistons and thus a change in position of the screed is blocked. The two / two-way valve 21 in the lowering line 17 is open.
  • the travel switch 7 is brought into its closed position. It sets the travel drive in motion via the impulse line 24. At the same time, he switches on the control element 25. This in turn switches the two two-way valve 21 in the lowering line 17 into the lock position. The lifting cylinders 6 are thus blocked in both directions of movement and thus the screed 2. Simultaneously with these switching operations, a leveling device (not shown), which controls the adjusting movements of the leveling cylinders 5, was blocked via a pulse line 27. All changes in position of the screed 2 are thus switched off during the start. Simultaneously with the switching of the driving switch, the timer 26 was applied.
  • the timer 26 switches in the electrical control circuit 13 in such a way that both the two / two-way valve 19 and the two / two-way valve 21 are switched to free passage. So that the lifting cylinders 6 are released in both directions of movement, the screed is kept floating. At the same time, the blockage of the leveling cylinders is released via the impulse line 27.
  • the switching operations described ensure that the screed, together with the booms 3 and the lifting cylinders 6, forms a system that is rigidly connected to the road construction machine 1 and does not allow any changes in height during a certain travel time of the road construction machine.
  • the screed cannot be forcibly lifted by road construction material that came in front of the screed before the road construction machine came to a standstill and lost flowability during the standstill due to cooling. A height error in layer 9 is avoided.
  • the subsequent simultaneous release of the leveling device and the lifting cylinder movement brings about a seamless transition to the normal working process.
  • the invention is not restricted to the exemplary embodiment. It is essential that the vertical movement of the screed automa during a certain time of arrival table is blocked and then fully released again automatically.
  • the manner of this blocking and its control essentially depends on the design of the screed attachment and suspension and its actuation and control devices.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Soil Working Implements (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Abstract

Die Erfindung betrifft ein Verfahren zur Höhenregulierung für eine Nivellierungs- und Verdichtungsbohle, die von einer Straßenbaumaschine gezogen wird. Während des Arbeitsvorganges wird die Höhe der schwimmend aufliegenden Bohle selbsttätig reguliert. Mit der Erfindung wird bezweckt eine unerwünschte Anhebung der Bohle durch eine Fahrtunterbrechung vor der Bohle in seinem Fließzustand verändertes Material zu verhindern. Erfindungsgemäß wird deshalb beim Einschalten des Fahrantriebes das Anheben der im Stillstand gegen Absenken gesperrten Bohle ebenfalls blockiert und die Blockade erst nach einer vorgegebenen Zeitspanne aufgehoben.The invention relates to a method for height regulation for a leveling and compaction screed that is pulled by a road construction machine. The height of the floating screed is automatically regulated during the work process. The purpose of the invention is to prevent an undesired lifting of the screed due to an interruption in travel in front of the screed in its flowing state. According to the invention, when the travel drive is switched on, the lifting of the screed, which is locked at a standstill against lowering, is also blocked and the blockage is only released after a predetermined period of time.

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruches 1.The invention relates to a method according to the preamble of claim 1.

Mit einem derartigen Verfahren können körnige und asphalt-oder zementgebundene Straßenbaumaterialien mit verschiedener Fließfähigkeit in der gewünschten Dicke aufgetragen werden. Dabei wird die Schichtdicke im wesentlichen durch den Anstellwinkel der Bohle zum Einbaugrund und ihre Fahrgeschwindigkeit, in Verbindung mit dem Fließ- und Verdichtungsverhalten des Einbaumaterials, bestimmt. Es ist bekannt, das Arbeitsergebnis während des Arbeitsvorganges durch geeignete Meßgeräte zu überwachen und die Höhe der Bohle notfalls entsprechend zu regulieren. Beim Stillstand der Maschine wird diese vertikale Beweglichkeit der schwimmenden Aufhängung nach unten verriegelt derart, daß die Bohle nicht unter die vorgegebene Höhenlage absinken kann. Dies ist vor allem wichtig, wenn während eines Arbeitsweges vorübergehend ein Halt notwendig wird, beispielsweise durch Stockung beim Materialnachschub. Bei dem bekannten Verfahren wird bei erneutem Fahrbeginn die Höhenblockade aufgehoben, die Bohle liegt auf dem Eintaumaterial wieder schwimmend auf. Dabei gelangt sie zunächst auf Einbaumaterial, das unmittelbar vor dem Unterbrechen der Arbeitsfahrt noch vor die Bohle gebracht wurde. Je nach Material und Stillstandszeit kann sich dabei die Fließfähigkeit durch Abkühlen so geändert haben, daß bei erneut beginnender Vorwärtsbewegung der Bohle diese einem erhöhten Stauwiderstand begegnet und angehoben wird. Erreicht sie bei der weiteren Fahrbewegung Einbaumaterial mit Normaltemperatur und -fließfähigkeit schwimmt sie wieder auf die Normalhöhe ein. Der im Anfahrbereich entstandene Schichtdickenunterschied zeichnet sich deutlich ab und muß durch aufwendige Nacharbeit ausgeglichen werden.With such a method, granular and asphalt-bound or cement-bound road building materials with different flowability can be applied in the desired thickness. The layer thickness is essentially determined by the angle of attack of the screed to the paving ground and its driving speed in connection with the flow and compaction behavior of the paving material. It is known to monitor the work result during the work process by means of suitable measuring devices and, if necessary, to regulate the height of the screed accordingly. When the machine is at a standstill, this vertical mobility of the floating suspension is locked down in such a way that the screed cannot sink below the predetermined height. This is particularly important if a stop is temporarily necessary during a commute, for example due to a halt in the supply of materials. In the known method, the height blockade is lifted when the journey begins again and the screed is floating on the thawing material again. The first step is to get paving material that was brought to the screed immediately before the work trip was interrupted. Depending on the material and downtime, the flowability may have changed by cooling so that when the screed begins to move forward again, this counteracts and increases the stagnation resistance. He if it submits paving material with normal temperature and flowability as it moves further, it swims back to normal height. The difference in layer thickness in the start-up area is clearly visible and must be compensated for by extensive rework.

Es wurde bereits versucht, Höhenfehler beim Anfahren durch manuell eingeleitete Steuerbewegungen der Bohlenhöhenverstellung zu vermeiden. Dies hat sich als schwierig und wenig erfolgversprechend herausgestellt.Attempts have already been made to avoid height errors when starting off by means of manually initiated control movements of the screed height adjustment. This turned out to be difficult and not very promising.

Der Erfindung liegt die Aufgabe zugrunde ein Verfahren der eingangs geschilderten Art zu schaffen, das selbsttätig Anfahrhöhenfehler verhindert.The invention has for its object to provide a method of the type described, which automatically prevents approach height errors.

Die Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen des Anspruches 1 gelöst.The object is achieved according to the invention by a method having the features of claim 1.

Die in ihren H5henbewegungen in beiden Richtungen blockierte Bohle bildet während des Anfahrens mit ihren Aufhängeorganen an der Straßenbaumaschine ein starres System mit fixierter Bohlenstellung. Auch bei erhöhtem Stauwiderstand kann die Bohle sich nicht nach oben bewegen. Das starre System gestattet ihr auch,den erhöhten Stauwiderstand zu überwinden, d.h. überstehendes Material abzustreifen. Ebenso selbsttätig, wie die Blockade bei Fahrtbeginn auftritt, wird sie nach Ablauf der vorgebenen Zeitspanne aufgehoben, d.h. die Bohle wieder in die schwimmende Lage gebracht. Die Wahl der Zeitspanne ergibt sich aus den jeweiligen Arbeitsbedingungen, d.h. der bei Fahrtabbruch voraussichtlich mit Material vor der Bohle bedeckten Wegstrecke und der Anfahrbeschleunigung und Geschwindigkeit der Straßenbaumaschine. Diese Größen ergeben sich aus der Bauart der Straßenbaumaschine und der Bohle, gegebenenfalls aus dem verwendeten Straßenbaumaterial. Es bietet somit keine Schwierigkeiten eine Zeitspanne zu wählen, die eine weitgehend gleichmässige Schichtdicke auch bei Zwischenstopp in der Arbeitsbewegung gewährleistet.The screed, which is blocked in its vertical movements in both directions, forms a rigid system with a fixed screed position during start-up with its suspension elements on the road construction machine . The screed cannot move upwards even when there is increased backlog resistance. The rigid system also allows her to overcome the increased congestion resistance, ie to strip off excess material. Just as automatically as the blockage occurs at the start of the journey, it is lifted after the specified period of time, ie the screed is brought back into the floating position. The choice of the time period results from the respective working conditions, ie the distance likely to be covered with material in front of the screed when the trip is stopped and the acceleration and speed of the road construction machine. These sizes result from the construction of the road construction machine and the screed, possibly from the road construction material used. It does not pose any difficulties to choose a period of time that ensures a largely uniform layer thickness even with a stopover in the work movement.

Bei einem Verfahren, bei dem die Höhenlage der Bohle mit einer Höhennivelliereinrichtung entsprechend einer Referenzlinie während des Arbeitsvorganges geregelt wird, kann durch das Merkmal des Anspruches 2 sichergestellt werden, daß während des Anfahrtsvorganges keine Nivellierungsbewegungen, weder nach oben noch nach unten, erfolgen. Die Nivellierungseinrichtung wird somit nicht durch die erhöhten Stauwiderstände belastet, sondern gehört vielmehr zum starren System.In a method in which the height of the screed is regulated with a height leveling device according to a reference line during the working process, it can be ensured by the feature of claim 2 that no leveling movements, neither upwards nor downwards, take place during the starting process. The leveling device is therefore not burdened by the increased storage resistance, but rather belongs to the rigid system.

Das Merkmal des Anspruches 3 sichert die exakte Nivellierungs- und Verdichtungsarbeit der Bohle nach Ablauf der gewählten Zeitspanne. Es gibt zwischen der starren Höheneinstellung und der regulierbaren, schwimmenden Auflage keinen Übergangsbereich, in dem bewegliche Organe auf noch blockierte einwirken.The feature of claim 3 ensures the exact leveling and compaction work of the screed after the selected period of time. There is no transition area between the rigid height adjustment and the adjustable, floating pad, in which movable organs act on those that are still blocked.

Die Erfindung schafft auch eine Vorrichtung zur Durchführung des Verfahrens für eine Nivellierungs- und Verdichtungsbohle, die einerseits mit den Auslegern an der Strassenbaumaschine angelenkt ist, auf welche Nivellierungszylinder zur Winkel- und Höhenverstellung einwirken, und die zur schwimmenden Lagerung mittels Hubzylindern aufgehängt ist, die für die schwimmend aufliegende Arbeitsstellung über ein beitungs- und Ventilsystem sowohl an der Hub- als auch an der Druckseite offenzuhalten sind. Die erfindungsgemäße Höhenblockierung der Bohle im Anfahrtszeitraum wird nach dem Merkmal des Anspruches 4 über ein vom Schalter für den Fahrantrieb beaufschlagbares Steuergliede bewirkt, das mittels Ventilen die Zu- und die Ablaufleitungen der Hubzylinder sperrt und diese damit stillsetzt. Die Schwimmstellung schaltet ein Zeitglied nach Ablauf der gewählten Zeitspanne.The invention also provides a device for carrying out the method for a leveling and compaction screed, which is articulated on the one hand with the cantilevers on the road construction machine, on which leveling cylinders act for angle and height adjustment, and which is suspended for floating storage by means of lifting cylinders which are suitable for the floating working position must be kept open on both the lifting and pressure sides via a processing and valve system. The height blocking of the screed according to the invention in the approach period is effected according to the feature of claim 4 via a control element which can be acted upon by the switch for the travel drive and which blocks the inlet and outlet lines of the lifting cylinders by means of valves and thus silently puts. The floating position switches a timer after the selected period.

Das Merkmal des Anspruches 5 ermöglicht die Durchführung des Verfahrens nach dem Merkmal des Anspruches 3. Nivellierungseinrichtung und Hubzylinder bilden während der gewählten Zeitspanne einen starren höhenfixierten Verband, und nehmen anschließend gleichzeitig ihre normale Arbeitsbeweglichkeit an.The feature of claim 5 makes it possible to carry out the method according to the feature of claim 3. Leveling device and lifting cylinder form a rigid, height-fixed bandage during the selected time period, and then simultaneously assume their normal work mobility.

Das Merkmal des Anspruches 6 spricht eine vorteilhafte Weiterentwicklung der erfindungsgemäßen Vorrichtung an. Das Druckbegrenzungsventil verhindert Schäden an den Hubzylindern und/oder der Bohle in Extremfällen, d.h. wenn bei besonders langem Stillstand das Einbaumaterial verhärtet und/oder anormal hoch aufgeschüttet sein sollte.The feature of claim 6 addresses an advantageous further development of the device according to the invention. The pressure relief valve prevents damage to the lifting cylinders and / or the screed in extreme cases, i.e. if the paving material should harden and / or be filled up abnormally during a particularly long standstill.

Das erfindungsgemäße Verfahren wird nachstehend anhand eines Ausführungsbeispieles einer erfindungsgemäßen Vorrichtung anhand der Zeichnungen beschrieben. Es zeigen:

  • Fig. 1 eine Straßenbaumaschine mit angehängter Nivellierungs- und Verdichtungsbohle während eines Arbeitsvorganges und
  • Fig. 2 ein elektrisches und hydraulisches Schaltschema einer Blockierungseinrichtung.
The method according to the invention is described below using an exemplary embodiment of a device according to the invention with reference to the drawings. Show it:
  • Fig. 1 is a road construction machine with attached leveling and compaction screed during a process and
  • Fig. 2 is an electrical and hydraulic circuit diagram of a blocking device.

An eine als Ganzes mit 1 bezeichnete Straßenbaumaschine ist eine Nivellierungs- und Verdichtungsbohle 2 angehängt. Die Verbindung zwischen der Bohle 2 und der Baumaschine 1 stellen Lenker 3 her, die jeweils mit ihrem freien Ende seitlich an der Straßenbaumaschine an einem Anhängepunkt 4 befestigt sind. Die Anhängepunkte 4 sind jeweils mittels Nivellierungszylindern5 im Sinne des Doppelpfeiles A höhenverstellbar. Am hinteren Ende der Straßenbaumaschine 1 sind ferner in der Nähe der Bohle 2 an den Lenkern 3 angreifende Hubzylinder 6 angeordnet. Die Hubzylinder 6 sind doppeltwirkend.A leveling and compaction screed 2 is attached to a road construction machine designated as a whole by 1. The connection between the screed 2 and the construction machine 1 is made by handlebars 3, each with its free end are attached to the side of the road construction machine at an attachment point 4. The attachment points 4 can each be adjusted in height by means of leveling cylinders 5 in the sense of the double arrow A. At the rear end of the road construction machine 1, lifting cylinders 6 engaging the handlebars 3 are also arranged in the vicinity of the screed 2. The lifting cylinders 6 are double-acting.

Bei einem Arbeitsvorgang bewegt sich die Straßenbaumaschine 1, nach Betätigen eines Fahrschalters 7, in der durch den Pfeil F angedeuteten Fahrtrichtung. Dabei wird in Fahrtrichtung vor die Bohle Straßenbaumaterial 8 gebracht, aus dem die Bohle durch Abstreifen und Verdichten eine Schicht 9 erwünschter Dicke formt. Die Bohle bewegt sich dabei auf dem Straßenbaumaterial 8 schwimmend aufliegend, gehalten von den in beiden Richtungen offenen Hubzylindern 6, d.h. bei freier Kolbenbewegung nach oben und unten.During an operation, the road construction machine 1, after actuating a driving switch 7, moves in the direction of travel indicated by the arrow F. Road material 8 is brought in front of the screed in the direction of travel, from which the screed forms a layer 9 of desired thickness by stripping and compacting. The screed moves floating on the road building material 8, held by the lifting cylinders 6 open in both directions, i.e. with free piston movement up and down.

Die erwünschte Schichtdicke wird von einer in der Nähe der Bohle 2 an der Straßenbaumaschine angeordneten Meßeinrichtung 10 überwacht, welche die Höhenlage der Bohle mit einer vorgegebenen Referenzlinie 11 vergleicht. Bei Abweichung beaufschlagt die Meßeinrichtung die Nivellierungszylinder 5. Diese verstellen ihrerseits die Anhängepunkte 4 nach oben oder unten. Dadurch ändert sich über die Ausleger 3 der Anstellwinkel der Bohle 2.The desired layer thickness is monitored by a measuring device 10 arranged in the vicinity of the screed 2 on the road construction machine, which compares the height of the screed with a predetermined reference line 11. If there is a deviation, the measuring device acts on the leveling cylinders 5, which in turn adjust the attachment points 4 upwards or downwards. As a result, the angle of attack of the screed 2 changes via the boom 3.

Bei Unterbrechung der Fahrt der Straßenbaumaschine, d.h. tei Abschalten des Fahrschalters 7. wird die Absenkbewegung der Bohle durch eine entsprechende Blockade der Hubzylinder 6 verhindert.If the road construction machine is interrupted, i.e. Tei switching off the driving switch 7. The lowering movement of the screed is prevented by a corresponding blockage of the lifting cylinder 6.

Ein als Ganzes mit 12 bezeichnetes hydraulisches Leitungs-und Ventilsystem sowie dessen elektrischen Steuerkreis 13 zeigt schematisiert Fig. 2. Von einer Hydraulikanlage 14 werden die Hubzylinder 6 über ein Vier/Dreiwegeventil 15 , eine Hubleitung 16 und eine Absenkleitung 17 verbunden. In der Hubleitung 16 ist ein Rückschlagventil 18 angeordnet und parallel dazu ein Zwei/Zweiwegeventil 19 angeschlossen. In der Absenkleitung 17 ist ein Rückschlagventil 20 und parallel dazu ein Zwei/Zweiwegeventil 21 angeschlossen. Außerdem zweigt von der Absenkleitung 17 zwischen den Ventilen und den Hubkolben 6 eine Abführleitung 22 ab, die zu einem Druckbegrenzungsventil 23 führt.A hydraulic line and valve system, designated as a whole as 12, and its electrical control circuit 13 are shown schematically in FIG. 2. Of a hydraulic system 14 the lifting cylinders 6 are connected via a four / three-way valve 15, a lifting line 16 and a lowering line 17. A check valve 18 is arranged in the stroke line 16 and a two / two-way valve 19 is connected in parallel thereto. A check valve 20 and, in parallel, a two / two-way valve 21 are connected in the lowering line 17. In addition, a discharge line 22 branches off from the lowering line 17 between the valves and the reciprocating piston 6 and leads to a pressure limiting valve 23.

Der elektrische Steuerkreis 13 ist vom Fahrschalter 7 her beaufschlagbar. Bei Betätigung des Fahrschalters 7 wird einerseits eine Impulsleitung 24 für den Fahrantrieb geschaltet. Andererseits werden über ein Steuerglied 25 die Ventile betätigt. Außerdem wird ein Zeitglied 26 beaufschlagt.The electrical control circuit 13 can be acted upon by the driving switch 7. When the travel switch 7 is actuated, on the one hand a pulse line 24 is switched for the travel drive. On the other hand, the valves are actuated via a control member 25. In addition, a timer 26 is applied.

Die Wirkungsweise des geschilderten hydraulischen Leitungs- und Ventilsystems sowie des zugehörigen elektrischen Steuerkreises wird nachstehend erläutert.The operation of the hydraulic line and valve system described and the associated electrical control circuit is explained below.

Fig. 2 stellt die Ruhestellung dar, d.h. der Fahrschalter 7 ist nicht geschlossen, die Straßenbaumaschine steht. In dieser Stellung ist das Zwei/Zweiwegeventil 19 in der Hubleitung 16 geschlossen. Ein Rücklauf der Hydraulikflüssigkeit aus der Kolbenstangenseite des Zylinders zur Hydraulikanlage ist nicht möglich, d.h. die Absenkbewegung der Kolben und damit eine Lageänderung der Bohle nach unten ist blockiert. Das Zwei/Zweiwegeventil 21 in der Absenkleitung 17 ist offen.Fig. 2 shows the rest position, i.e. the driving switch 7 is not closed, the road construction machine is stopped. In this position, the two / two-way valve 19 in the lifting line 16 is closed. A return of the hydraulic fluid from the piston rod side of the cylinder to the hydraulic system is not possible, i.e. the lowering movement of the pistons and thus a change in position of the screed is blocked. The two / two-way valve 21 in the lowering line 17 is open.

Bei Arbeitsbeginn wird der Fahrschalter 7 in seine Schlief- stellung gebracht. Über die Impulsleitung 24 setzt er den Fahrantrieb in Bewegung. Gleichzeitig schaltet er das Steuerglied 25 ein. Dieses schaltet seinerseits das Zwei Zweiwegeventil 21 in der Absenkleitung 17 in die Sperrstellung. Damit sind die Hubzylinder 6 in beiden Bewegungsrichtungen blockiert und damit die Bohle 2. Gleichzeitig mit diesen Schaltvorgängen wurde über eine Impulsleitung 27 eine nicht gezeigte Nivellierungseinrichtung blockiert, welche die Stellbewegungen der Nivellierungszylinder 5 steuert. Alle Lagenänderungen der Bohle 2 sind damit während des Anfahrens ausgeschaltet. Gleichzeitig mit dem Schalten des Fahrschalters wurde das Zeitglied 26 beaufschlagt. Nach Ablauf einer vorgegebenen Zeitspanne schaltet das Zeitglied 26 im elektrischen Steuerkreis 13 um dergestalt, daß sowohl das Zwei/Zweiwegeventil 19 als auch das Zwei/Zweiwegeventil 21 auf freien Durchgang geschaltet werden. Damit werden die Hubzylinder 6 in beiden Bewegungsrichtungen freigegeben, die Bohle wird schwimmend gehalten. Gleichzeitig wird die Blockade der Nivellierungszylinder über die Impulsleitung 27 aufgehoben.At the start of work, the travel switch 7 is brought into its closed position. It sets the travel drive in motion via the impulse line 24. At the same time, he switches on the control element 25. This in turn switches the two two-way valve 21 in the lowering line 17 into the lock position. The lifting cylinders 6 are thus blocked in both directions of movement and thus the screed 2. Simultaneously with these switching operations, a leveling device (not shown), which controls the adjusting movements of the leveling cylinders 5, was blocked via a pulse line 27. All changes in position of the screed 2 are thus switched off during the start. Simultaneously with the switching of the driving switch, the timer 26 was applied. After a predetermined period of time, the timer 26 switches in the electrical control circuit 13 in such a way that both the two / two-way valve 19 and the two / two-way valve 21 are switched to free passage. So that the lifting cylinders 6 are released in both directions of movement, the screed is kept floating. At the same time, the blockage of the leveling cylinders is released via the impulse line 27.

Die geschilderten Schaltvorgänge gewährleisten, daß während einer bestimmten Anfahrtszeit der Straßenbaumaschine die Bohle zusammen mit den Auslegern 3 und den Hubzylindern 6 ein starr mit der Straßenbaumaschine 1 verbundenes System bildet, das keine Höhenänderungen erlaubt. Die Bohle kann also nicht zwangsweise durch Straßenbaumaterial angehoben werden, das zeitlich vor dem Stillstand der Straßenbaumaschine vor die Bohle gelangt ist und während des Stillstandes durch Abkühlung an Fließfähigneit eingebüßt hat. Ein Höhenfehler in der Schicht 9 wirc camit vermieden. Die anschließende gleichzeitige Freigabe der Nivellierungseinrichtung und der Hubzylinderbewegung bewirkt den nahtlosen Übergang zum normalen Arbeitsvorgang.The switching operations described ensure that the screed, together with the booms 3 and the lifting cylinders 6, forms a system that is rigidly connected to the road construction machine 1 and does not allow any changes in height during a certain travel time of the road construction machine. The screed cannot be forcibly lifted by road construction material that came in front of the screed before the road construction machine came to a standstill and lost flowability during the standstill due to cooling. A height error in layer 9 is avoided. The subsequent simultaneous release of the leveling device and the lifting cylinder movement brings about a seamless transition to the normal working process.

Die Erfindung ist nicht auf das Ausführungsbeispiel beschränkt. Wesentlich ist, daß die Höhenbewegung der Bohle während eines bestimmten Anfahrtszeitabschnittes automatisch blockiert und anschließend selbsttätig wieder vollkommen freigegeben wird. Die Art und Weise dieser Blokkierung und ihrer Steuerung hängt wesentlich von der Bauform der Bohlenan- und -aufhängung und deren Betätigungs-und Steuereinrichtungen ab.The invention is not restricted to the exemplary embodiment. It is essential that the vertical movement of the screed automa during a certain time of arrival table is blocked and then fully released again automatically. The manner of this blocking and its control essentially depends on the design of the screed attachment and suspension and its actuation and control devices.

Claims (6)

1. Verfahren zur Höhenregulierung einer Nivellierungs-und Verdichtungsbohle einer fahrbaren Straßenbaumaschine, welche Verdichtungsbohle während eines Arbeitsvorganges über eine in einem Fließzustand befindliche Schicht von Straßenbaumaterial schwimmend aufliegend bewegt und beim Abschalten des Fahrantriebes gegen Absenken blockiert wird, dadurch gekennzeichnet , daß beim Einschalten des Fahrantriebes zusätzlich das Anheben der Bohle blockiert und die Blockade nach oben und unten nach einer vorgegebenen Zeitspanne aufgehoben wird.1. A method for regulating the height of a leveling and compaction screed of a mobile road construction machine, which moves the compaction screed in a floating manner over a layer of road construction material in a flowing state during a work process and is blocked against lowering when the travel drive is switched off, characterized in that when the travel drive is switched on additionally the lifting of the screed is blocked and the blockage is lifted up and down after a predetermined period of time. 2. Verfahren nach Anspruch 1, bei dem die Höhenlage der Bohle mittels einer Höhennivellierungseinrichtung entsprechend einer Referenzlinie geregelt wird, dadurch gekennzeichnet , daß die Höhennivellierungseinrichtung erst nach einem bestimmten Zeitabstand nach Einschalten des Fahrantriebes eingeschaltet wird.2. The method according to claim 1, wherein the height of the screed is controlled by means of a height leveling device according to a reference line, characterized in that the height leveling device is only switched on after a certain time interval after switching on the travel drive. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet , daß die Höhennivellierungseinrichtung und die Aufhängung für die schwimmende Auflage der Bohle gleichzeitig, d.h. im gleichen Zeitabstand nach dem Einschalten des Fahrantriebes entsperrt werden.3. The method according to claim 2, characterized in that the height leveling device and the suspension for the floating support of the screed simultaneously, i.e. unlocked at the same interval after switching on the travel drive. 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, mit einer einen Fahrschalter aufweisenden Straßenbaumaschine, einer an diese mittels Auslegern und Hubzylindern angehängten Nivellierungs- und Verdichtungsbohle, mit den Auslegern zur Winkel- und Höheverstellung zugeordneten Nivellierungszylindern für die Bohle, und mit einem Leitungs- und Ventilsystem für die Hubzylinder, das für die schwimmend aufliegende Arbeitsstellung die Hub- und die Absenkseite der Hubzylinder offenhält, und beim Abschalten des Fahrantriebs die Absenkseite der Hubzylinder blockiert, dadurch gekennzeichnet , daß das Leitungs- und Ventilsystem (12) ein vom Fahrschalter (7) beaufschlagbares Steuerglied (25) aufweist, das beim Einschalten des Fahrschalters (7) die Hub- und die Absenkleitung der Hubzylinder (6) mittels Ventilen (19 und 21) sperrt und über ein Zeitglied (26) nach Ablauf einer gewählten Zeitspanne das Leitungs- und Ventilsystem (12) in die Schwimmstellung für die Hubzylinder (6) schaltet.4. Apparatus for carrying out the method according to claim 1, with a road construction machine having a travel switch, a leveling and compacting screed attached to it by means of brackets and lifting cylinders, with the leveling cylinders for the screed assigned to the brackets for angle and height adjustment, and with a line and valve system for the lifting cylinders, which holds the lifting and lowering sides of the lifting cylinders open for the floating working position, and blocks the lowering side of the lifting cylinders when the travel drive is switched off, characterized in that the line and valve system (12) is activated by the driving switch (7 ) acted upon control element (25) which, when the driving switch (7) is switched on, blocks the lifting and lowering lines of the lifting cylinders (6) by means of valves (19 and 21) and via a timer (26) the line after a selected period of time and the valve system (12) switches to the floating position for the lifting cylinders (6). 5. Vorrichtung nach Anspruch 4, d a durch gekennzeichnet , daß das Zeitglied (26) nach Ablauf der Blockierungszeit für die Hubzylinder (6) zusätzlich die Steuerung für die Nivellierungszylinder (5) einschaltet.5. The device according to claim 4, d a characterized in that the timer (26) also turns on the control for the leveling cylinder (5) after the blocking time for the lifting cylinder (6). 6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet , daß das Leitungs- und Ventilsystem (12) in dem das Anheben der Bohle blockierenden Bereich ein einstellbares Druckbegrenzungsventil (23) aufweist.6. Apparatus according to claim 4 or 5, characterized in that the line and valve system (12) in which the lifting of the screed blocking area has an adjustable pressure relief valve (23).
EP86113678A 1985-10-03 1986-10-03 Method and device for the height adjustment of a screed Expired - Lifetime EP0217408B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113678T ATE50010T1 (en) 1985-10-03 1986-10-03 METHOD AND DEVICE FOR ADJUSTING THE HEIGHT OF A LEVELING BOARD.

Applications Claiming Priority (2)

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DE3535362A DE3535362C1 (en) 1985-10-03 1985-10-03 Method and device for adjusting the height of a leveling screed
DE3535362 1985-10-03

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EP0217408A2 true EP0217408A2 (en) 1987-04-08
EP0217408A3 EP0217408A3 (en) 1987-10-28
EP0217408B1 EP0217408B1 (en) 1990-01-31

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EP86113678A Expired - Lifetime EP0217408B1 (en) 1985-10-03 1986-10-03 Method and device for the height adjustment of a screed

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US (1) US4759657A (en)
EP (1) EP0217408B1 (en)
CN (1) CN1007169B (en)
AT (1) ATE50010T1 (en)
DE (2) DE3535362C1 (en)
ES (1) ES2013231B3 (en)
GR (1) GR3000358T3 (en)

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EP0678623A1 (en) * 1994-04-21 1995-10-25 Joseph Vögele AG Roadpaver
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EP0536037A1 (en) * 1991-09-30 1993-04-07 Etat Francais - Laboratoire Central Des Ponts Et Chaussees Process and apparatus for measuring the average thickness of a roadlayer
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US5879104A (en) * 1995-12-19 1999-03-09 Joseph Vogele Ag. Slip-form paver for road constructions of concrete

Also Published As

Publication number Publication date
EP0217408A3 (en) 1987-10-28
DE3535362C1 (en) 1987-03-26
CN86106861A (en) 1987-04-29
GR3000358T3 (en) 1991-06-07
ATE50010T1 (en) 1990-02-15
US4759657A (en) 1988-07-26
DE3668651D1 (en) 1990-03-08
ES2013231B3 (en) 1990-05-01
CN1007169B (en) 1990-03-14
EP0217408B1 (en) 1990-01-31

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