Nothing Special   »   [go: up one dir, main page]

EP0217408B1 - Method and device for the height adjustment of a screed - Google Patents

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

Info

Publication number
EP0217408B1
EP0217408B1 EP86113678A EP86113678A EP0217408B1 EP 0217408 B1 EP0217408 B1 EP 0217408B1 EP 86113678 A EP86113678 A EP 86113678A EP 86113678 A EP86113678 A EP 86113678A EP 0217408 B1 EP0217408 B1 EP 0217408B1
Authority
EP
European Patent Office
Prior art keywords
lifting
levelling
switched
height
screed
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.)
Expired - Lifetime
Application number
EP86113678A
Other languages
German (de)
French (fr)
Other versions
EP0217408A2 (en
EP0217408A3 (en
Inventor
Paul Dörr
Roland Dipl.-Ing. Grundl (Fh)
Alfred Dr.-Ing. Ulrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joseph Voegele AG
Original Assignee
Joseph Voegele AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6282695&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0217408(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Joseph Voegele AG filed Critical Joseph Voegele AG
Priority to AT86113678T priority Critical patent/ATE50010T1/en
Publication of EP0217408A2 publication Critical patent/EP0217408A2/en
Publication of EP0217408A3 publication Critical patent/EP0217408A3/en
Application granted granted Critical
Publication of EP0217408B1 publication Critical patent/EP0217408B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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 (US-A-4 026 658) 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 vehicle starts driving again, the screed is again floating on the paving material.
  • 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, it meets and increases the resistance to accumulation. If it reaches 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, i.e. to strip off any excess material.
  • the choice of the time period results from the respective working conditions, i.e. the distance likely to be covered with material in front of the screed and the acceleration and speed of the road construction machine when the trip is interrupted.
  • 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 start-up 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 used for The floating working position must be kept open on both the lifting and pressure sides via a line and valve system.
  • the height blocking of the screed in the approach period according to the invention 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 stops them.
  • a timer switches to the floating position after the selected period of time.
  • 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 of which is attached laterally with its free end to the road construction machine at an attachment point 4.
  • the attachment points 4 are each height adjustable by means of leveling cylinders 5 in the sense of the double arrow 4.
  • 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 hydraulic cylinders 14 connect the lifting cylinders 6 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 is not closed, the road construction machine is at a standstill. 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 driving 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 into the blocking 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 has reached the screed before the road construction machine comes to a standstill and has lost its flowability during the standstill due to cooling. A height error in layer 9 is thus 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 height movement of the screed is automatically blocked during a certain travel time period and then automatically released again. The way this blockage and its control depends essentially on the design of the screed attachment and its actuation and control devices.

Landscapes

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

Abstract

The present invention refers to a method for controlling the vertical adjustment of a levelling and compacting plank drawn by a road-construction machine. During the working procedure the level of the plank, which is in floating contact with the material, is adjusted automatically. The present invention aims at preventing undesirable lifting of the plank caused by material which is located ahead of the plank and the flowability of which was changed due to an interruption in the motion of the machine. Hence, the invention employs the feature that, when the travelling mechanism is switched on, lifting of the plank, which is blocked against lowering when the machine is standing still, is blocked as well and that the blocking is eliminated only 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 (US-A-4 026 658), 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 Einbaumaterial 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 Stillstandzeit 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 (US-A-4 026 658) 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 vehicle starts driving again, the screed is again floating on the paving material. 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, it meets and increases the resistance to accumulation. If it reaches 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 Höhenbewegungen 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 Stra- βenbaumaterial. 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, i.e. to strip off any excess material. Just as automatically as the blockage occurs at the start of the journey, it is released after the specified period of time, i.e. brought the screed back into the floating position. The choice of the time period results from the respective working conditions, i.e. the distance likely to be covered with material in front of the screed and the acceleration and speed of the road construction machine when the trip is interrupted. These sizes result from the construction of the road construction machine and the screed, possibly from the road construction material used. There is therefore no difficulty in choosing a period of time which ensures a largely uniform layer thickness even when stopping in the working 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 Anfahrtvorganges 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 start-up 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 Leitungs- 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 Steuerglied bewirkt, das mittels Ventilen die Zu- und die Ablaufleitungen der Hubzylinder sperrt und diese damit stillsetzt. In 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 used for The floating working position must be kept open on both the lifting and pressure sides via a line and valve system. The height blocking of the screed in the approach period according to the invention 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 stops them. A timer switches to the floating position after the selected period of time.

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.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.

Es zeigen

  • Fig. 1 eine Straßenbaumaschine mit angehängter Nivellierungs- und Verdichtungsbohle während eines Arbeitsvorganges und
  • Fig. 2 ein elektrisches und hydraulisches Schaltschema einer Blockierungseinrichtung
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 Stra- βenbaumaschine an einem Anhängepunkt 4 befestigt sind. Die Anhängepunkte 4 sind jeweils mittels Nivellierungszylindern 5 im Sinne des Doppelpfeiles 4 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 of which is attached laterally with its free end to the road construction machine at an attachment point 4. The attachment points 4 are each height adjustable by means of leveling cylinders 5 in the sense of the double arrow 4. 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. bei 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. when the driving switch 7 is switched off, the lowering movement of the screed is prevented by a corresponding blockage of the lifting cylinders 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. The hydraulic cylinders 14 connect the lifting cylinders 6 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 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 is not closed, the road construction machine is at a standstill. 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 Schließstellung 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 in die Sperrstellung. Damit sind die Hubzylinder 6 in beiden Bewegungsrichtungen blockiert und damit die Bohle 2. Gleichzeitig mit diesen Schaltvorgängen wurden über eine Impulsleitung 27 eine nicht gezeigte Nivellierungseinrichtung blockiert, welche die Stellbewegungen der Nivellierungszylinder 5 gesteuert. 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 driving 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 into the blocking 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 Fließfähigkeit eingebüßt hat. Ein Höhenfehler in der Schicht 9 wird damit 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 has reached the screed before the road construction machine comes to a standstill and has lost its flowability during the standstill due to cooling. A height error in layer 9 is thus 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 Blockierung 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 height movement of the screed is automatically blocked during a certain travel time period and then automatically released again. The way this blockage and its control depends essentially on the design of the screed attachment and its actuation and control devices.

Claims (6)

1. Method for height regulation of a levelling and compacting beam of a mobile road-construction machine, which compacting beam moves floatingly over a layer of road-construction material in its flowing state during the work process, and which beam is blocked from lowering itself whilst the drive is switched off, characterised in that the lifting of the beam is also blocked when the drive is switched on, and the upward and downward blocking is lifted after a pre-set time period.
2. Method according to claim 1 wherein the height level of the beam is controlled by way of a height-levelling device relative to a line of reference, characterised in that the height-levelling device is switched on only after a certain time lapse after the drive has been switched on.
3. Method according to claim 2, characterised in that the height-levelling 60VIGO and the suspension of the floating abutment of the beam are simultaneously unlocked, i.e. at the same time lapse after switching on the drive.
4. Device for the execution of the method according to claim 1, including a road-construction machine with a drive switch, a levelling and impacting beam mounted thereon by way of booms and lifting cylinders, with levelling cylinders for angular and vertical adjustment of the beam engaging the booms, and with a pipe- and valve system for the lifting cylinders which keeps the lift and the down side of the lifting cylinder open for the floatingly abutting working position and which blocks the down side of the lifting cylinder when the drive is switched off, characterised in that the pipe- and valve system (12) includes a control member (25) which is operated by the drive switch (7) which blocks the lift and down pipe of the lifting cylinders (6) by way of valves (19 and 21) when the drive switch (7) is switched on and which switches the pipe- and valve system (12) via a timing device (26) into the floating state for the lifting cylinders (6) after a selected time period.
5. Device according to claim 4, characterised in that the timing device (26) additionally switches on the control of the levelling cylinders (5) after expiration of the blocking period of the lifting cylinders (6).
6. Device according to claim 4 or 5, characterised in that the pipe- and valve system (12) has an adjustable pressure-relief valve (23) in the area where the lifting of the beam is blocked.
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)

Application Number Priority Date Filing Date Title
DE3535362A DE3535362C1 (en) 1985-10-03 1985-10-03 Method and device for adjusting the height of a leveling screed
DE3535362 1985-10-03

Publications (3)

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

Family

ID=6282695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113678A Expired - Lifetime EP0217408B1 (en) 1985-10-03 1986-10-03 Method and device for the height adjustment of a screed

Country Status (7)

Country Link
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)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810891A1 (en) * 1988-03-30 1989-10-19 Heilit & Woerner Bau Ag SUBSTRATE PAVER
US5046889A (en) * 1989-12-05 1991-09-10 Sterner Jr Carl L Rolling screed spreader box
DE4040027A1 (en) * 1990-12-14 1992-06-17 Joseph Voegele Ag METHOD FOR ADJUSTING THE THICKNESS OF A PAVING LAYER WITH A PAVER
US5569807A (en) * 1992-05-01 1996-10-29 Phillips Petroleum Company Isoparaffin-olefin alkylation
FR2681886B1 (en) * 1991-09-30 1994-02-11 Etat Francais Lab Ponts Chaussee METHOD AND DEVICE FOR MEASURING THE AVERAGE THICKNESS OF A GROUND LAYER.
DE4211286C2 (en) * 1992-04-03 2003-08-21 Metso Dynapac Gmbh Method for locking a paving stone of a paver and paver for carrying out the method
DE9406683U1 (en) * 1994-04-21 1994-06-30 Joseph Vögele AG, 68163 Mannheim Paver
US5533828A (en) * 1994-09-29 1996-07-09 Astec Industries, Inc. Method and apparatus for discharging paving materials on top of distributing auger
US5568992A (en) * 1995-05-19 1996-10-29 Caterpillar Paving Products Inc. Screed control system for an asphalt paver and method of use
DE29520147U1 (en) * 1995-12-19 1996-02-08 Voegele Ag J Slipform paver for concrete construction
DE19647150C2 (en) * 1996-11-14 2001-02-01 Moba Mobile Automation Gmbh Device and method for controlling the installation height of a road finisher
US5868522A (en) * 1997-01-16 1999-02-09 Astec Industries, Inc. Vibratory screed assembly for an asphalt paving machine
DE19709131C2 (en) * 1997-03-06 2003-02-20 Abg Allg Baumaschinen Gmbh pavers
DE10155507B4 (en) * 2001-11-13 2005-10-06 Abg Allgemeine Baumaschinen-Gesellschaft Mbh Finisher for the bottom-side installation of layers for roads od. Like.
AU2004231529B2 (en) * 2003-03-25 2008-10-09 Somero Enterprises, Inc. Apparatus and method for improving the control of a concrete screed head assembly
US20050163565A1 (en) * 2004-01-27 2005-07-28 Quenzi Philip J. Concrete-chute strike-off device
US8382395B2 (en) * 2008-06-20 2013-02-26 Caterpillar Inc. Paving system and method for controlling compactor interaction with paving material mat
US7946787B2 (en) * 2008-06-27 2011-05-24 Caterpillar Inc. Paving system and method
US20100196096A1 (en) * 2009-02-02 2010-08-05 Somero Enterprises, Inc. Apparatus and method for improving the control of a concrete screeding machine
DE102009019839A1 (en) * 2009-03-09 2010-09-16 Bomag Gmbh Hydraulic control arrangement for the screed of a road paver
US9200415B2 (en) * 2013-11-19 2015-12-01 Caterpillar Paving Products Inc. Paving machine with automatically adjustable screed assembly
EP3137683B1 (en) 2014-04-28 2020-10-14 Somero Enterprises, Inc. Concrete screeding system with floor quality feedback/control
DE102016008253A1 (en) * 2016-07-08 2018-01-11 Dynapac Gmbh Road paver and method of making a pavement
US10895045B2 (en) 2017-12-18 2021-01-19 Somero Enterprises, Inc. Concrete screeding machine with column block control using gyro sensor
US10472777B1 (en) * 2018-05-02 2019-11-12 Caterpillar Paving Products Inc. Screed tow point assembly for paver

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2333371C2 (en) * 1973-06-30 1990-08-02 Dynapac HOES GmbH, 2906 Wardenburg Paver finisher
US4026658A (en) * 1974-07-26 1977-05-31 Barber-Greene Company Automatic support system for a screed
SU975862A1 (en) * 1981-03-26 1982-11-23 Proizv T I Dorozhnogo Str Latt Device for controlling position of ironing plate of asphalt placing machine

Also Published As

Publication number Publication date
DE3535362C1 (en) 1987-03-26
GR3000358T3 (en) 1991-06-07
CN1007169B (en) 1990-03-14
ES2013231B3 (en) 1990-05-01
US4759657A (en) 1988-07-26
DE3668651D1 (en) 1990-03-08
EP0217408A2 (en) 1987-04-08
ATE50010T1 (en) 1990-02-15
EP0217408A3 (en) 1987-10-28
CN86106861A (en) 1987-04-29

Similar Documents

Publication Publication Date Title
EP0217408B1 (en) Method and device for the height adjustment of a screed
EP0309761B1 (en) Aircraft ground-handling vehicle with an actuating device for the swinging support plates
DE2009427C3 (en) Trackless paver for widening existing road surfaces
DE102007026527A1 (en) Control system for an engine grader for changing the contours of building sites and road surfaces comprises a hydraulic cylinder positional sensor for determining the traveling position of a first hydraulic cylinder and a controller
DE2738771A1 (en) AUTOMATIC CONTROL SYSTEM FOR THE WORK TOOL OF A WORK VEHICLE
DE2441379A1 (en) RIPPING DEVICE FOR ROAD PAVING IN PARTICULAR MADE OF ASPHALT
EP1310598B1 (en) Paver for laying roadlayers
EP1703023A1 (en) Slit wall digging device with direction control system
DE3716260C1 (en) Method for adjusting and fastening functional areas of a guideway of an electromagnetic high-speed train and device for carrying out the method
DE2330548A1 (en) DEVICE THAT LAYS A TAPE OF A MOLDABLE PLASTIC MIXTURE DURING ITS FORWARD MOVEMENT
CH625139A5 (en) Apparatus for pivoting a spray nozzle to and fro about a pivot axis, in particular for spraying concrete
EP0102060B1 (en) Device for automatically controlling the height of the preliminary strike-off of a conforming plate finisher
EP1179636A1 (en) Road paver and method of paving
DE9211854U1 (en) Paver
EP0335339B1 (en) Basecourse finisher
AT395877B (en) DEVICE FOR ROWING AND LEVELING A TRAFFIC AREA COVERED AND / OR ICE-FROZEN
EP0088140B1 (en) Plough having a plough frame with a lateral implement mount
DE2007986C3 (en) Trackless road patrol
DE3325991A1 (en) AUTOMATIC CUTTER FOR ASPHALTED ROAD AREAS
EP0104441B1 (en) Insertion device
DE102006037903B3 (en) Belt`s direction stability monitoring and controlling device for use in mining industry, has pulse generator staying in connection with cylinder in adjusting device for adjustment of belt inverter by electro-hydraulical controller
DE3123126C2 (en)
DD201924A5 (en) TRACK STOP FUNG MACHINE
DE3111323A1 (en) Synchronism monitoring device, in particular for elevating platforms
DE1459690A1 (en) Concrete casting machine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE ES FR GB GR IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE ES FR GB GR IT LI NL SE

17P Request for examination filed

Effective date: 19880427

17Q First examination report despatched

Effective date: 19890306

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI NL SE

REF Corresponds to:

Ref document number: 50010

Country of ref document: AT

Date of ref document: 19900215

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3668651

Country of ref document: DE

Date of ref document: 19900308

ET Fr: translation filed
ITF It: translation for a ep patent filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GR

Payment date: 19900809

Year of fee payment: 5

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19900924

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19901009

Year of fee payment: 5

26 Opposition filed

Opponent name: ABG-WERKE GMBH

Effective date: 19900811

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19901011

Year of fee payment: 5

Ref country code: AT

Payment date: 19901011

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19901015

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19901018

Year of fee payment: 5

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19901031

Year of fee payment: 5

NLR1 Nl: opposition has been filed with the epo

Opponent name: ABG-WERKE GMBH

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19901123

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19901130

Year of fee payment: 5

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 19910809

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state
NLR2 Nl: decision of opposition
BERE Be: lapsed

Owner name: JOSEPH VOGELE A.G.

Effective date: 19911031

REG Reference to a national code

Ref country code: GR

Ref legal event code: MF4A

Free format text: 3000358

EUG Se: european patent has lapsed

Ref document number: 86113678.6

Effective date: 19911227

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO