EP2325393A1 - Method and paver for manufacturing a street covering - Google Patents

Abstract

The method involves distributing material stocks (26, 27) for manufacturing a street covering by a distributor screw (16) of a paver before a placement plank (17) of the paver. Size of the material stocks is determined and adjusted. Height of one of the material stocks from the placement plank is determined by a sensor (34). A level of the material stocks is held up to a predetermined level before the plank by a height-adjustable guide plate (23) between the distributor screw and the placement plank and/or is brought to a height corresponding to the predetermined level. An independent claim is also included for a paver for manufacturing a street covering.

Description

The invention relates to a method for producing a road surface according to the preamble of claim 1. The invention further relates to a road finisher for producing a road surface according to the preamble of claim 10.

Road pavers are used for the production of road surfaces preferably asphalt (black slabs). Such usually self-propelled road pavers have seen in the direction of installation behind a chassis via a distributor screw and a screed arranged behind it. The screed may be designed as a so-called Variobohle with variable working width. The auger distributes the material for the production of the road surface over the entire working width of the screed. Between the auger and the screed a baffle is arranged. The baffle is adjustable in height to limit the stock of road building material (material supply) in front of the screed to a certain level.

In known road pavers, the change in the height of the baffle is made manually. As a result, in practice, the adjustment of the height of the baffle to the supply of material in front of the screed for negligence or convenience is often not made. The result is that an unacceptably high supply of material accumulates in front of the screed, which could affect the floating behavior of the screed and the road construction material in front of the screed could cool too much. In addition, there is the problem with Variobohlen that the change in the working width is difficult or even impossible if has accumulated before the screed too much road construction material.

The invention has for its object to provide a paver and a method for operating the same, whereby automatically the height of the baffle is changeable so that the supply of material remains in front of the screed at a desired level.

A method for achieving the stated object has the measures of claim 1. Accordingly, it is provided to determine and adjust the size of the material supply, ie the amount of road construction material. Thus, the supply of material is automatically adapted to specifications, which ensures that on the one hand no more built-in material accumulates as desired in front of the screed, but on the other hand always a sufficient supply of material before the screed is present.

It is preferably provided to continuously determine the height of the material supply at least in front of the screed and to adjust the material supply to a predetermined level. This level is chosen so that there is not too much road construction material in front of the screed, but also always sufficient road construction material in front of the screed is present. The intended level can be a level range with an upper and a lower target level. If the upper target level is exceeded, the supply of road construction material to the screed is briefly interrupted, while below the lower target level road construction material is transported in front of the screed. If the level of the material supply between an upper and a lower setpoint, so a predetermined level range held, this does not require a constant change in the level. If the supply is in the range of the upper and lower target level, it does not need to be changed.

According to a preferred embodiment of the invention, it is provided by a height-adjustable baffle between the auger and the screed to maintain or bring the level of material supply in front of the screed at the desired level or in Sollniveaubereich. By moving the baffle up and down, the material supply can be easily kept at this target level. Likewise, it is also possible to bring the deviating from the target level material supply back to the desired level. If the nominal level is exceeded, the height of the material supply in front of the screed is reduced to the desired level by lowering the baffle. Vice versa is at too low a level of material supply by a corresponding start-up of the baffle, the supply of material in front of the screed again divided up to reach the target level. It is thus automatically ensured that there is always sufficient road construction material in front of the screed, but accumulates in front of the screed but also not too large stock of material.

According to a preferred embodiment of the method, not only the height of the material supply behind the baffle, ie in the material space between the baffle and the screed, but also determines the supply of material before the baffle, ie in the material space between the auger and the baffle. This is done by a preferably continuous height scanning of the material supply, also called material template, in front of and behind the baffle. In this way, it is ensured that sufficient road construction material is always present in front of the baffle in order to be able to fill the material supply in front of the screed again to preferably the desired level in front of the screed with too little road construction material.

Preference is given to proceeding so that when exceeding the desired level of material supply in front of the screed, the baffle is automatically lowered stepwise, so possibly multi-level, to a Mindesteinstellwert. Preferably, this is done in such a way that the material supply before the screed has reached its desired level again. In contrast, when the material supply has exceeded the target level in front of the screed, then lowered in several stages or gradually the baffle.

With too little material in front of the screed is first checked whether the supply of material in front of the baffle is sufficient to increase by raising the baffle, the level of material supply in front of the screed, in particular until it reaches the target level. This is done by an additional Höhenabtastung the road construction material in the space in front of the baffle. If there is a sufficient supply of material in front of the baffle, the baffle is gradually raised until the supply of material in front of the screed is again sufficiently large, in particular has reached the target level. If, however, the supply of material in front of the baffle is too small, first the height of the baffle is not changed and instead the stock of road construction material filled in front of the baffle, in particular until the supply of road construction material has reached the target level before the baffle. A paver to solve the above object has the features of claim 10. Accordingly, sensors for determining the level of the material supply are arranged in front of and behind the guide plate. These sensors cooperate with a positioner and / or a control thereof, whereby an automatic change in height of the baffle is made in dependence on the level of material supply in front of and behind the baffle. It is thus automatically ensured that the material supply before the screed is always at a desired level or in a Sollviveaubereich. By determining the level of the road construction material before the baffle, ie in the space between the baffle and the auger, it is ensured that there is always enough material available to fill the space behind the baffle, so before the screed, if necessary, sufficient can.

The baffle is changeable in a preferred embodiment of the paver in width. This is done to adapt to the working width of a Variobohle. This ensures that the baffle holds the supply of material in front of the screed over the entire width of the same on the intended target level or Sollniveaubereich. Likewise, the width of the baffle can be adapted to the working width of the screed in rigid screeds with lateral Anschiebeteilen.

The Leitblleich is guided by suitable drives, such as hydraulic cylinders or spindle drives in a guide frame up and down movable. The frame captures the forces exerted by the paving material on the baffle, especially if there is a larger supply of material in front of the baffle.

It is further provided to change the baffle in width by lateral attachments. In this case, attachments are also provided for the guide frame, which correspond to the format of the laterally to be mounted baffles. This type of training of the variable-width baffle comes into consideration for screeds whose width is variable not only by retractable and extendable sliding parts, but in addition by attachments.

Fig. 1

eine schematische Seitenansicht eines Straßenfertigers,

Fig. 2

eine Draufsicht auf den Straßenfertiger der Fig. 1,

Fig. 3

eine vergrößerte Einzelheit 111 des Straßenfertigers der Fig. 1, und

Fig. 4

ein schematisches Ablaufschema der automatischen Höhenverstellung eines Leitblechs des Straßenfertigers der Fig. 1 bis 3.

A preferred embodiment of the invention will be explained in more detail with reference to the drawing. In this show:

Fig. 1

a schematic side view of a paver,

Fig. 2

a top view of the paver of the Fig. 1 .

Fig. 3

an enlarged detail 111 of the paver of Fig. 1 , and

Fig. 4

a schematic flow diagram of the automatic height adjustment of a baffle of the paver of Fig. 1 to 3 ,

The road paver 10 shown in the figures is used for the production of road surfaces. Preferably, the paver used for the production of so-called black slabs, namely asphalt pavements.

The paver 10 is self-propelled. For this purpose, it has a central drive unit 11 which has, for example, an internal combustion engine which has hydraulic pumps for supplying hydraulic motors and optionally a generator for generating energy for electric drives. Incidentally, the road paver 10 has a landing gear 12 which, in the exemplary embodiment shown, is designed as a tracked chassis. The paver 10 may also have a wheel gear. The chassis 12 is driven by the drive unit 11 such that the paver for the production of the pavement in the production direction 13 moves.

Viewed in the production direction 13, a trough or trough-like reservoir 14 is arranged in front of the chassis 12. The reservoir 14 receives a supply of serving for the production of the pavement material, such as asphalt on. By a trained example as a scraper conveyor member, the road construction material from the reservoir 14 is transported against the direction of manufacture 13 to the rear end 15 of the paver 10. The rear end 15 is seen in the production direction 13 behind the chassis 12 and the drive unit 11 of the paver 10th

At the rear end 15 of the road paver 10, a distributor screw 16 and - seen in the production direction 13 at a distance behind it - a screed 17 are arranged. The auger 16 and the screed 17 are moved up and down. For this purpose, the screed 17 is attached to support arms 18. The support arms 18 are pivotally mounted on the chassis 12. Hydraulic cylinders or the like pivot the support arms 18 to raise or lower the screed 17.

The road paver 10 shown here has a screed 17 designed as a vario sole Fig. 2 it can be seen that the Variobohle has a central base board 19 with approximately the width of the chassis 12 and two opposite sides of the base 19 associated displacement members 20. The displacement members 20 are oppositely together and moved apart to change the working width of the paver 10. The working width of the screed 17 shown here can be further increased by so-called add-on parts 21. In the illustrated embodiment, each side of the screed 17 are assigned two identical attachments 21 and on each side of an outer narrow attachment 22. The invention is not limited to the screed 17 shown, that is a Variobohle with attachments 21 and 22. Rather, the invention is suitable for paver 10 with screeds 17 of any kind, for example, rigid planks with hydraulically extendable end pieces.

Between the auger 16 and the screed a vertical Leitblleich 23 is provided ( Fig. 3 ). The baffle 23 is in the Fig. 2 for the sake of clarity only partially (left half of Fig. 2 ). In fact, the baffle 23 but extends over the entire working width of the screed 17 including the sliding parts 20 and the add-on parts 21 and 22. The baffle 23 is the same as the screed 17 variable in the working width by the width of the baffle 23 to the respective working width of Screed 17 is adaptable, so that in each case the width of the guide plate 23 of the width of the screed 17 including the sliding parts 20 and the add-on parts 21 and 22 corresponds. How the particular Fig. 3 shows the Leitblleich 23 behind the chassis 12 of the paver 10 two seen in the production direction 13 consecutive material spaces 24 and 25 for receiving a respective stock 26, 27 of the road construction material. The material space 24 in front of the baffle 23 is located in front of the baffle 23 behind the chassis 12 by a so-called tunnel plate 28, so that the material space 24 is located between the tunnel plate 28 and the baffle 23. The rear material space 25 extends in the region between the guide plate 23 and the screed 17.

The baffle 23 is mounted in a vertical guide frame 29 and movable up. The upward and downward movement of the guide plate 23 in the guide frame 29 is effected by one or more hydraulic cylinders 30 or other linear drives. The respective hydraulic cylinder 30 is fixed to a piston part, namely height-invariably, attached to a horizontal traverse 31 at the top of the guide frame 29. The piston rod part of the hydraulic cylinder 30 which can be moved up and down in the vertical direction is articulated at the upper edge of the guide plate 23. The guide frame 29 of the baffle 23 is braced by struts 32 to the chassis 12 of the paver 10 out. As a result, the baffle 23 is stabilized transversely to the production direction 13 in order to compensate for the forces exerted by the road construction material in the material space 24 before the guide plate 23 to last.

Both the material space 24 in front of the baffle 23 and the material space 25 behind the baffle 23 sensors 33 and 34 are assigned, which is in the illustrated embodiment, for example, on the ultrasonic principle working level sensors. The sensors 33 and 34, which are arranged parallel to one another in a direction transverse to the direction of production 13, contact the level, namely the height, of the respective material supply 26 and 27 in the material spaces 24 and 25 without contact. Preferably, each material space 24 and 25 several distributed over the working width of the paver 10 arranged sensors 33, 34 are arranged in particular equal distances next to each other. As a result, the level in each material space 24, 25 is scanned separately over the entire working width of the height. The sensors 33, 34 thus determine not only the height of the material supply 26, 27 in each material space 24, 25 but also the distribution of the material supply 26, 27 over the working width of the paver 10th

The sensors 33, 34 can be arranged at arbitrary locations of the material spaces 24 and 25 with respect to the production direction 13. In the embodiment of Fig. 3 On the other hand, the sensors 34 are positioned in the material space 25 behind the baffle 23 approximately between the baffle 23 and the screed 17. The positioning of all sensors 33, 34 above the respective material space 24 and 25 takes place firmly, that is, stationary. In particular, the height of the sensors 33, 34 above the ground 35 is immutable. The distance between the sensors 33, 34 with one another can be variable, in particular in the case of variobooms, as the distance of the sensors 33 and 34 from one another is reduced when the working width is reduced, while the distance increases correspondingly when the working width is increased.

In the screed 17 shown here ( Fig. 2 ), the guide plate 23 and the guide plate 23 associated guide frame 29 are telescoped, so that the working width of the guide plate 23 with the change in the working width of the base board 19 through the sliding members 20 can be infinitely increase or decrease. The baffle 23 and the guide frame 29 are as far telescopically moved apart as the sliding parts 20 are maximally extendable relative to the base board 19. Consequently, the maximum width of the baffle 23 corresponds to the maximum width of the base board 19 and the two extended sliding parts 20. When broadening the screed 17 by the attachments 21 and 22, the width of the baffle 23 is also widened by attachments, the width of the attachments 21 and 22 correspond to the screed 17. The baffles 23 to be installed are guided in their own guide frame, so that in the region of each attachment 21, 22, the width of the baffle 23 can be increased by additional baffles with these associated guide frame.

The road paver 10 still has a control or regulation, not shown in the figures, with which the guide plate 23, including all possibly existing widening is selectively moved up and down. As a result, the hydraulic cylinder 30 is extended or retracted by the control system accordingly. The required signals for retraction or extension of the hydraulic cylinder 30 receives the control or regulation of the sensors 33 and 34, so that depending on the level of material supply 26 and 27 in the material spaces 24 and 25, the control automatically hydraulic cylinders 30 for up or ., Down movement of the baffle 23 actuated.

• Es werden vom erfindungsgemäßen Verfahren die Höhen der Materialvorräte 26 und 27 in Abhängigkeit von den laufend gemessenen Höhen auf Sollniveaus gebracht, und zwar ein Solniveau im Materialraum 24 vor dem Leitblech 23 und ein Solniveau im Materialraum 25 hinter dem Leitblech 23. Hierbei kann es sich um vorgegebene Soll-Höhen handeln, aber auch Niveaubereiche mit maximalen Höhen und minimalen Höhen.

The method according to the invention is explained in more detail below with reference to the figures and the drawings:

• There are brought by the inventive method, the heights of the material stocks 26 and 27 depending on the currently measured heights to target levels, namely a sol level in the material space 24 in front of the baffle 23 and a sol level in the material space 25 behind the baffle 23. This may be predetermined target heights act, but also level ranges with maximum heights and minimum heights.

The distributed over the working width sensors 33 and 34 scan the height of the material supply 26 in the material space 24 in front of the baffle 23 and the height of the material supply 27 in the material space 25 behind the guide plate 23 from contact. This scanning can be done continuously or at certain intervals.

The controller compares the actual levels of material supplies 26 and 27 determined by the sensors 33, 34 with the target levels of road construction material in the material spaces 24 and 25. In the event of deviations, the control plate 23 correspondingly raises or lowers the material supply 27 in the material space 25th behind the guide plate 23 and before the screed 17 increases or decreases until reaching the desired level or a maximum or minimum target level.

Increases the height of the material supply 27 in the rear material space 25 in front of the screed 17 on the target level, the baffle 23 is lowered by extending the hydraulic cylinder 30 of the control. Decreases in the material space 25, the height of the material supply 27 below the target level, the hydraulic cylinder 30 are retracted by the controller and thereby raised the baffle 23. Similarly, the height of the material supply 26 is monitored in the material space 24 in front of the baffle 23 by the controller and at a decrease in the material supply 25 below a target height or a minimum target height road construction material from the reservoir 14 of the paver 10 of a scraper belt in the material space 24 transported until the setpoint level or a maximum target level is reached. In this way, it is ensured that in the material space 24 in front of the baffle 23 always sufficient road construction material is present to fill the rear material space 25 when too low a supply of material 27 is located in front of the screed 17.

In the Fig. 4 is schematically illustrated the sequence of the method according to the invention, which in the embodiment shown stepwise, namely cascade-like runs. After the production of the road surface has been started with the paver 10, the level of the road construction material in the material space 24 and 25 is scanned contactlessly at regular time intervals, namely after a selectable timing, so measured by the sensors 33 and 34, ie measured how high the material supply 26th and 27 in the material spaces 24 and 25. After the respective measuring operation is completed, a query is made as to whether the material supply 27 in the material space 25 in front of the screed 17 corresponds to the desired height. If this is the case, the height of the baffle 23 is not changed. The measurement is repeated at regular intervals. If it is determined in any subsequent measurement that the material supply 27 does not correspond to the desired height, a distinction is made as to whether the material supply 27 in the rear material space 25 is above or below the desired height. If the material supply 27 is above the desired height, ie an excessive material supply 27 has accumulated in the material space 25 in front of the screed 17, the hydraulic cylinder 30 for lowering the baffle 23 is actuated by the controller. After expiry of the time specification, ie after a certain reaction time, the height of the material supplies 26 and 27 is then scanned contactless again by the sensors 33 and 34. If it turns out that the material supply 27 is still above the desired height, the guide plate 23 is lowered again. This polling process is repeated at regular intervals until the stock of material 27 has reached its desired height by optionally repeated stepwise lowering of the baffle 23.

If the sensors 33 and 34 detect a deviation of the material supply 27 in the rear material space 25 from the desired height and results in this determination that the height is smaller than the desired height of the material supply 27, then it is first queried whether there is still enough road construction material in the front material space 24 in front of the baffle 23 is present. If this is the case, the guide plate 23 is raised so that more road construction material can pass from the material space 24 in front of the guide plate 23 in the rear material space 25 in front of the screed 17. Also, the lifting of the baffle 23 is carried out stepwise by repeatedly determined at predetermined intervals, as the previous lifting of the baffle 23 has the height of the material supply 27 in the rear material space 25 has been affected. The gradual lifting of the baffle 23 takes place until the subsequent measurement has shown that the material supply 27 has reached its desired height before the screed.

If, when falling below the setpoint height of the material supply 27, it is found that there is not enough road construction material in the material space 24, the material space 24 is filled up with material from the reservoir 14 until the or each sensor 33 associated with the material space 24 is detected has that the material supply 26 in the front material space 24 before the baffle 23 has reached its desired height. After filling the material space 24 is again determined by polling at least the sensors 34, if the material supply 27 already reaches its desired height in the rear material space 25 by filling the front material space 24. If this is not the case, then optionally one or more times (stepwise), the guide plate 23 is gradually raised and filled up by at predetermined time intervals successive level measurements of the material space 25.

Claims (13)

Method for producing a road surface with a preferably self-propelled road paver (10), wherein a stock of material (material supply (26, 27) for producing the road surface from a distributor screw (16) of the paver (10) in front of a screed (17) of the road paver (17) 10) is distributed, characterized in that the size of the material supply (26, 27) is determined and adjusted accordingly. A method according to claim 1, characterized in that the height of the material supply (27) at least in front of the screed (17) determined by at least one sensor (34) and the material supply (27) is set to a predetermined desired level. A method according to claim 1 or 2, characterized in that the material supply (27) in front of the screed (17) is gradually adjusted so that it gradually has a height which is at the desired level. Method according to one of the preceding claims, characterized in that held by a height-adjustable baffle (23) between the auger (16) and the screed (17) the level of at least the material supply (27) in front of the screed (17) at the desired level or is brought to a level corresponding to the desired level. Method according to one of the preceding claims, characterized in that a material supply (26) in front of the guide plate (23), in particular the height of the material supply (26) in front of the guide plate (23), is determined by at least one sensor (33). Method according to one of the preceding claims, characterized in that when exceeding the target level of the material supply (27) in front of the screed (17), the guide plate (23) is preferably gradually lowered until the material supply (27) has reached its desired level. Method according to one of the preceding claims, characterized in that when falling below the target level of the material supply (27) in front of the screed (17) is first checked whether the material supply (26) in front of the guide plate (23) is sufficient to lift the baffle (23) to bring the material supply (26) in front of the screed (17) to the desired level. Method according to one of the preceding claims, characterized in that at a sufficient supply of material (26) in front of the baffle (23) last, preferably gradually increased until the material supply (27) before the screed (17) has reached the desired level. Method according to one of the preceding claims, characterized in that in the case of too small a supply of material (26) in front of the baffle (23) with unchanged setting of the baffle (23) the supply in front of the baffle (23) is filled, preferably until reaching a desired level the material supply (26) in front of the guide plate (23). Paver with a preferably driven chassis (12), in the production direction (13) behind the chassis (12) arranged screed (17), a distributor screw (16) between the chassis (12) and the screed (17) and a variable-height baffle ( 23) between the auger (16) and the screed (17) for changing the level of at least one material supply (27) in front of the screed (17), characterized in that sensors (33, 34) for determining the level of the material supply (26, 27) are arranged in front of and behind the guide plate (23) and the guide plate (23) an actuator for automatic height adjustment in dependence from the level of the inventories of the sensors (33, 34) determined material supplies (26, 27) is assigned. Road paver according to claim 10, characterized in that the guide plate (23) is variable in width for adaptation to the working width of the screed (17). Paver according to claim 10 or 11, characterized in that the guide plate (23) is guided in a preferably rigid guide frame (29) movable up and down. Paver according to one of claims 10 to 12, characterized in that the guide plate (23) is widened by lateral attachments of preferably separate Anbauleitblechen and cultivation guide frame.

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