EP1179636A1 - Road paver and method of paving - Google Patents

Abstract

The road construction machine, with a placement plank (B) to carry a tamper (T) and vibrator (V), has a height adjustment drawing point (Z) for the beam and an additional linkage axis (G) to give the plank a further swing setting through a remote controlled setting unit (4). The additional axis is either at the leading side and at a gap below the upper side of the plank between the beam end and the plank, or in the beam between its leading and trailing sections. The action is set according to the nature of the laid road surface material, the machine travel speed, the material temperature, the tamper speed and the vibration frequency, together with other functional parameters in a closed control circuit.

Description

The invention relates to a paver according to the preamble of claim 1 or Preamble of claim 2, and an installation method according to the preamble of the claim 11th

From the magazine "Asphalt 8/99, pp. 36 to 38, installation of traffic drums" it is known the usual turnbuckles for setting the screed angle of attack relative to the spars by hydraulic cylinders with internal position transmitters Automatically controlled angle positioning of the screed to replace. With a Programmed controls are based on programmed setting values installed in the course of the traffic area, e.g. Traffic drift, i.e. cambered Cross sleepers with a certain profile.

In road pavers according to EP 513 942 A and DE 195 13 195 A there is another joint axis arranged at the top of the screed and under the spars while the turnbuckles or the hydraulic cylinders replacing them as actuators are placed between the free spar ends and the top of the screed. The Position of the further joint axis requires a certain pivot kinematics for the Screed used in the lever arms of the actuator for the installation of certain ceiling structures is unfavorable.

With a road paver known from US 5 851 085 A (Fig. 7) the screed can be via a manually operated spindle in different positions relative to the Bring spars, with the hinge at or below the top of the screed in Screed interior is arranged.

The invention has for its object a paver of the type mentioned Specify type and an installation procedure that allow certain Manufacture ceiling structures in a different way and, if desired, automatically.

The task is with the features of claim 1 or the sibling Claim 2 and with the procedural features of the process claim 11 solved.

According to claim 1, the further hinge axis on or in front of the front Screed provided, then even slight swivel adjustments result of the actuators, which work with cheap lever arms, make clear changes in the angle of attack the screed. The pivoting kinematics of the screed is also for Manufacture so-called drums useful.

Alternatively, according to claim 2, the swivel adjustment of the screed around made relatively far forward and low-lying further articulated axis in the spars, which is particularly favorable for the installation of drums in kinematic swivel conditions results.

According to the process, ceiling structures such as drifts and the screed are manufactured adjusted in a closed control loop in which a wealth of recorded control parameters is taken into account. Thanks to the abundance of control parameters, the desired one Install profile yourself automatically with higher accuracy, for example not only a swivel adjustment of the screed around the further articulation axis is carried out with a defined course over the respective installation route, but also other control parameters are taken into account to achieve the desired Shape or reproduce the profile precisely. The control parameters coordinated and / or changed relative to each other so the required accuracy of the ceiling structure and its exact reproduction can be achieved, even if parameters should change from installation to installation.

Hydraulic or mechanical actuators are particularly suitable as actuators with assigned path or inclination detection systems. That way not only to adjust the respective swivel strokes sensitively and precisely reproducibly, it is always the actual position of each actuator and therefore the screed known.

Favorable kinematics is placed deep and in front of the screed, further joint axis achieved.

The further hinge axis can be easily built into a hinged flange connection integrate between the bar ends and the screed, including the at least one actuator is operatively arranged in the flange connection.

For a sensitive swivel adjustment of the screed around the deep one A further actuator axis can be an actuator with cheap lever arms on abutments Grasp the handlebar end and the top of the screed.

If the further joint axis is provided between the front and rear spar sections, expediently engage the actuators with relatively large distances the further articulation axis to make sensitive swivel adjustments of the screed to effect or the connection of the spars in the region of the further joint axis stable to design. The actuator can be placed in front of or behind the other joint axis his.

To the paver to different paving conditions or other points of view To be able to adapt, it is useful to the front bar sections several articulation points that can optionally be used as additional joint axes for the rear spar sections provided.

The space on the paver is favorable with favorable kinematic conditions This is taken into account when the rear spar sections are in the lower position of the further joint axis each consisting of a sloping part and one to the rear kinking, leading to the screed and firmly connected to this part.

The other hinge axis should be in the rear axle area of the paver, preferably in the working direction in front of the rear axle.

According to the method, the inclination should also be included in the closed control loop of the road paver are processed as a control parameter. This is for precise determination of the relative position of the screed expedient. An important The procedural point of view is the tamper speed and / or the vibrator frequency on the relative height setting of the pull points and / or the relative position the screed around the further articulation axis. A then raised Tamper speed causes e.g. aiding the swimming of the Screed. The material template can also be changed by changing the screw speed additionally increase to temporarily add more mix in front of the screed bring.

Because when installing a specific ceiling profile (such as a drum), not only changes of the screed's angle of attack is decisive for the generated profile the swivel adjustment of the screed, e.g. around the further joint axis, depending on various control parameters are carried out by which the driving speed, the mix temperature or consistency, the tamper speed, the vibrator frequency, the screw speed and / or height adjustment or the like, are some examples. The control parameters used should all or coordinated with each other individually or in groups.

Another important procedural aspect is the tamper speed and / or the vibrator frequency to the natural vibration frequency of the screed or the screed unit. This tuning can make unpredictable Work situations are avoided.

Is done by changing the screed position and increasing if necessary the tamper speed temporarily brought more mix in front of the screed, then the screed jacks are switched on to assist to assist with the screed tracking movement.

Fig. 1

eine schematische Seitenansicht einer ersten Ausführungsform eines Straßenfertigers mit Mitteln zur Schnelleinstellung der Einbaudicke,

Fig. 2

eine schematische Seitenansicht einer zweiten Ausführungsform eines Straßenfertigers,

Fig. 3

schematisch, zwei unterschiedliche Ausführungsformen der Gesamtanordnung zur Schnelleinstellung der Einbaudicke,

Fig. 4

eine Detailvariante zu Fig. 1,

Fig. 5

eine Detailvariante zu Fig. 2, und

Fig. 6

eine Seitenansicht einer weiteren Ausführungsform eines Straßenfertigers mit Mitteln zur Schnelleinstellung der Einbaudicke.

Exemplary embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:

Fig. 1

1 shows a schematic side view of a first embodiment of a road paver with means for quickly adjusting the paving thickness,

Fig. 2

2 shows a schematic side view of a second embodiment of a paver,

Fig. 3

schematic, two different embodiments of the overall arrangement for quick adjustment of the installation thickness,

Fig. 4

2 shows a detailed variant of FIG. 1,

Fig. 5

a detailed variant of Fig. 2, and

Fig. 6

a side view of another embodiment of a road paver with means for quickly adjusting the paving thickness.

On a chassis E of a paver F in Fig. 1 is on side rails H one Screed B articulated. From mixed material held ready in a front bunker M becomes a traffic surface cover 1 with a when the road finisher is traveling predetermined ceiling structure D, e.g. a drift. Mix M becomes a height-adjustable distribution screw arrangement at the rear of the chassis E. Q promoted (front mix template V1), distributed and as a rear mix template V2 installed from screed B. The spars H are adjustable in height on 3 actuators Tension points Z supported in a guide 2 on chassis E.

A further articulation axis G is provided between the bars H and the screed B, the parallel to the front hinge axis defined by the pull points Z. is. The further hinge axis G is located in FIG. 1 on or in front of a front side 6 the screed B and at a distance below the top of it 5. At the bar ends and the front 6 of the screed B is a flange 7, 8 with approximately provided to the spar ends vertical flanges, which in Fig. 1 by the underlying further hinge axis G are hingedly connected to one another. The Folding position of the flange connection 7, 8 is by means of at least one hydraulic or mechanical actuator 4 which is remotely adjustable during installation work travel, to select or change the angle of screed B In the Screed B can be provided at least one speed-controllable tamper T. Furthermore, in the case of a smoothing plate 9 lying below, its frequency can be adjusted Vibrators V are used, and can be in the screed B a tilt detection system N may be included. As an alternative or in addition, a cylinder travel detection system can be used W can be used to tilt information for example the screed (angle of attack relative to the level).

When installing the ceiling structure D, e.g. of the punch, are for quick adjustment the paving thickness not only up or down the tension points Z of the bars H, but Alternatively or additively, the screed E can be adjusted around the further joint axis G. become. If necessary, there is even only one change for installing a drum the screed B is made about the further articulation axis G.

The spars H run past a rear axle 27 of a chassis. When hiring the angle of attack of the screed B by means of the inclination detection system N or the cylinder travel detection system W is monitored, can as additional control parameters the temperature and consistency of the mix, the speed of work, the tamper speed, the auger speed, the Auger height and / or the vibrator frequency are taken into account, to make the profile of the punch as precise as possible.

Thanks to the further articulated axis G lying deep in FIG Adjustment movements by the actuator 4 the rear lower edge of the screed B down or up. Furthermore, the towing forces are favorable small lever arm in relation to the displacement resistance of the mix in the transfer rear mix template V2.

In Fig. 2 the further hinge axis G is arranged within the spars H between the spar front sections H _V and spar rear sections H _H and at a clear distance below the level of the top 5 of the screed B. Each spar front section H _V contains a plurality of articulation points 10, which can optionally be used for the further articulation axis G and enable adaptation to the respective installation conditions. The spar front section H _V is extended against the working direction to the rear and forms a support projection 11. The actuator 4, by means of which the screed B can be adjusted about the further articulation axis G, is inserted between the spar rear section H _H and the support projection 11. In the screed B at least one tamper T, vibrators V on the smoothing plate 9, or even a pressure bar system K can be provided for higher compaction. Furthermore, inclination detection systems N and / or cylinder path measurement or detection systems W can be provided in or on the screed B or the actuators 3, 4.

In Fig. 3, both alternatives (further hinge axis G on or in front of the front in the dashed field X, or between the spar front and spar rear sections H _V , H _H in the dashed field Y) are shown side by side, although in practice only in each case an alternative of a further joint axis G will be provided.

The actuator 3 for the pull point Z along the guide 2 is a so-called leveling hydraulic cylinder, which is supported on the chassis E. The actuator 3 can Travel detection system W assigned to a programmable control or control device C is connected. This has an adjustable Programming part P. On the chassis E, an inclination detection system N 'for the relative inclination of the paver or its chassis E attached and with the Control device C may be connected. Also a detection system 18 for the installation speed can be connected to the control device C. On the chassis E are connected to booms 12 lifting cylinders 13 which engage on the spars H, to raise or lower screed B or in a floating position to keep. The lifting cylinders 13 can be installed when installing the ceiling structure D assist. The stroke cylinders 13 and / or the actuators 3 can also be used to determine the travel path W can be assigned, which are connected to the control device C. are. Each actuator 4 for the employment of the screed B to the Another hinge axis G is via a travel detection system W to the control device C connected.

Each tamper T is usually driven by an eccentric drive 14 with a specific selectable speed driven. A detection and adjustment system 15 is transmitted the respective tamper speed to the control device C, wherein the control device C can change the speed. The vibrators V with their eccentric drives are analogous 16 connected to the control device C via a detection system 17, as well as the inclination or travel detection systems N, W. For example the rear mix material template V2 in front of the screed B can be changed change the screw speed and / or height. Because usually in a distribution screw arrangement Q left and right, independently speed controllable Distribution screws are included, even the ceiling profile can be between set left and right differently.

3 shows adjustments of the pulling points Z and / or the angle of attack of the screed B around the further hinge axis G not only on the basis of programmed or specified target values, but in a closed control loop in Dependence on control parameters such as the paving speed, the temperature of the mix or consistency, the tamper speed, and / or the vibration frequency, because these parameters influence how the screed B is adjusted is to the desired profile or the desired ceiling structure without or if necessary also to be installed with the help of external references or control systems. Also a pressure bar system K can participate in the formation of the ceiling structure D.

Depending on the paving thickness and the paving profile (e.g. for one Drempel) changed or adjusted the compaction setting of the screed B. become, i.e. the tamper, vibrator and possibly the pressure bar frequency.

Fig. 4 indicates a variant of Fig. 1, in which the flange connection 7, 8 between the bar ends and the screed B is designed so that the further hinge axis G is above, while the actuator 4 is arranged below, namely expediently between downward extensions of the flanges the flange connection 7, 8. The actuator 4 is a travel detection system W. assigned. The further hinge axis G lies approximately at the height of the top 5 the screed B, or even above it.

The support projection 11 in the variant of FIG. 5 is an extension of the approximately horizontal section 20 of the rear spar section H _H , from which the obliquely downward section 19 branches downward and is connected in the further joint axis G to the front spar section H _V. The actuator 4 with its adjustment path detection system W is arranged between the articulation point 21 on the support projection 11 and, for example, one of the articulation points 10 in the spar front section H _V.

6 shows a road paver as a further detail variant to FIGS. 1 and 4 Crawler chassis shown in a side view, in which the further joint axis G in the rear spar end regions of the spars H is arranged. The screed B is with bearing blocks 8 'attached on their front side in the direction of work travel in front of and below the level of the top of screed B. additional pivot axis G can be swiveled. The actuators 4 are each between one arranged at the bar end abutment 22 and one on the top 5 of the Screed B arranged abutment 23 at a clear distance above the supported another joint axis G. The actuators 3 with their travel detection systems W serve to adjust the pull points Z along the guide 2. Die Lift cylinder 13, which are also equipped with travel detection systems W. can also be used to track the screed during paving become.

The respective paving thickness is set quickly in a closed control loop, an important consideration in regulation can be that Tamper speed and / or the vibrator frequency on the change in the angle of attack the screed B and the paving thickness of the mix M Increasing the tamper speed causes e.g. a floating screed on the initially more compacted mix. The lifting cylinders could help 13, e.g. depending on the consistency of the mix, for a tracking movement of the screed be charged. The rear mixture template V2 can be changed the auger speed and / or the auger height adjustment change, e.g. increase so that temporarily more mix before the screed is brought. The screed can also be a pressure bar system (K, as in Fig. 3) included for higher compression of the mix. The rear one Mix material template V2 in front of the screed can be, as I said, by changing the Screw speed or screw height adjustment vary. The left or right screw speeds can be independent from each other can be recorded and changed, which may change the profile the ceiling structure D can vary between left and right.

Claims (15)

Asphalt paver (F) with a towed screed (B), which is connected to bars (H) articulated on the chassis (E) of the paver with height-adjustable traction points (Z), and with a further horizontal articulated axis (G) that is transverse to the working direction , around which the screed (B) can additionally be pivoted with at least one remotely adjustable actuator (4), characterized in that the further articulation axis (G) on or in front of the front side (6) of the screed (B) between the respective spar end and the screed is arranged. Asphalt paver (F) with a towed screed (B), which is connected to bars (H) articulated on the chassis (E) of the paver with height-adjustable traction points (Z), and with a further horizontal articulated axis (G) that is transverse to the working direction , around which the screed (B) can be additionally pivoted with at least one remotely adjustable actuator (4), characterized in that the further articulated axis (G) in the bars (H) and between front, with the pulling points (Z) on the chassis (E ) articulated front spar sections (H _V ) and rear spar sections (H _H ) connected to the screed (B) is provided. Paver according to claim 1 or 2, characterized in that the actuators (4) are hydraulic or mechanical actuators, in particular with associated path or inclination detection systems (W). Road paver according to claim 1, characterized in that the further hinge axis (G) is arranged at a distance below the plane of the upper side (5) of the screed (B). Road paver according to Claim 1, characterized in that the further articulated axis (G) and the actuators (4) are incorporated in a hinged flange connection (7, 8) between the bar ends and the screed (B). Paving machine according to claim 1, characterized in that the further joint axis (G) is arranged in the spars (H) in their spar end regions, that the screed (B) with at least one bearing block (8 ') arranged on its front side on the further joint axis ( G) is articulated and that each actuator (4) is arranged between an abutment (22) at the bar end and an abutment (23) on the top of the screed (B). A road paver according to claim 2, characterized in that the spar front section (H _V ) has a support projection (11) which is extended rearwards via the further hinge axis (G) or the spar rear section (H _H ) has a support projection (11) which is extended forwards via the further hinge axis (G), and that the actuator (4) is effectively inserted between the support projection (11) and a pivot point (10, 21) spaced from the joint axis (G) in the rear spar section (H _H ) or in the front spar section (H _V ). Road paver according to claim 2, characterized in that the spar front section (H _V ) has a plurality of articulation points (10) which can optionally be used as a further joint axis (G) and / or for the actuator. Paving machine according to claim 2, characterized in that the spar front section (H _V ) is at least approximately rectilinear, that the spar rear section (H _H ) consists of an obliquely rising part (19) and a part (20) which bends backwards, and that the inclined part (19) is articulated on the further articulation axis (G) lying below the part (20) on the spar front section (H _V ). Road paver according to claim 2, characterized in that the further articulated axis (G) lies in the rear axle area of the road paver (F), preferably in front of the rear axle (27) in the working direction. Method for installing predetermined ceiling structures (D), in particular microwaves or drums in traffic areas, with a paver (F) dragging a screed (B) and having a distributor screw arrangement (Q) for a mixture feed (V1, V2), the one with tampers (T) Screed and vibrators (V) equipped with screeds (H) and height-adjustable traction points (Z) on the chassis (E) of the asphalt paver (F) so that they can be adjusted in relation to the formation and pivoted about a further articulated axis (G) parallel to the traction points Which method is used at least to adjust the screed (B) by means of a programmed controller (C) on the basis of recorded actual and predetermined target data, characterized in that for quickly adjusting the paving thickness when installing programmed ceiling structures (D) the traction point height and / or the relative screed adjustment around the further articulation axis (G) and at least one value from the following group of Working parameters: installation speed, mix temperature or mix consistency, tamper speed, vibration frequency, material supply in front of and / or behind the distributor screw arrangement, screw speed and / or screw height setting are recorded as control parameters and processed in a closed control loop, several of which were recorded Control parameters can be coordinated. A method according to claim 11, characterized in that the inclination of the paver (F) and / or the screed (B) is (are) processed as control parameters. A method according to claim 11, characterized in that when installing the predetermined ceiling structure (D) the tamper speed and / or the vibrator frequency to the relative height setting of the pull points (Z) and / or the relative adjustment of the screed around the further articulation axis ( G) is coordinated. A method according to claim 11, characterized in that in the control, the tamper speed and / or vibrator frequency is (are) matched to the natural vibration frequency of the screed (B). A method according to claim 11, characterized in that the screed (B) for rapid adjustment of the paving thickness depending on the consistency of the mix is tracked by means of screed lifting cylinders (13).

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