EP2218824A1 - Screed - Google Patents

Abstract

The screed (E) has an extraction guiding structure (16) guided in a guiding sub-structure (17). A smoothing plate frame structure (14) is mounted at the extraction guiding structure, and includes an extraction screed-smoothing plate (11). Vertical guidances (20) and elevation adjustment assemblies (21) are provided between the frame structure and the extraction guiding structure, and vertically extend in relation to a linear sliding direction. The guidances and the assemblies adjust elevation of the frame structure in a parallel manner and relative to a base guiding structure (18).

Description

The invention relates to a screed according to claim 1.

Screeds with arranged on the front side of the base screed, to change the working width relative to the base screed laterally sliding screeds (eg US 2007/0258769 A1 ) are mainly used in North America, since at high installation speeds in the direction of travel at the front of the screed arranged Ausziehbohlen offer change in working width and / or installation of lateral connections for driveways or cross roads advantages over arranged at the rear of the base screed screeds. In addition, road surfaces with at least one lateral hanging shoulder and / or a berm are often to be installed. This is possible with front-side extendable planks with a relatively high installation speed. A shoulder, for example, has the purpose of dissipating rainwater sideways, while a berm is a rising from the shoulder or the road counterbore and is used for example for wastewater management. When changing the working width then the width of the road (level or lane or lane with roof profile) should remain unchanged. On the other hand, the width of the shoulder can vary.

At the US 2007/0258769 A1 known screed with front mounted on the base screed the screed mounted in the base scaffold base guide structure is pivoted by at least one vertical actuator relative to the base screed. In the base guide structure, the guide substructure is displaceably guided, on which, finally, the pull-out guide structure is displaceably guided. The base guide structure, the guide substructure and the pullout guide structure define a common linear displacement direction of the pullout beam. The screed frame is fixedly mounted on the pull-out guide structure. However, it may alternatively be tiltable by an actuator relative to the Ausziehführungsstruktur in the transverse direction. The actuator in the base pile can be used for height adjustments of the pulley relative to the base pile, but must not only absorb the weight forces of the entire pulley, but also built-in forces from the drag resistance of the paving material. Especially with fully extended Extending these forces are relatively high, which can be hindered during installation height adjustments. The double function of the actuator (height adjustment and pivoting relative to the base board) result in high local loads between the base guide structure, the ground pile and the actuator or actuators.

At the US-A-4379653 known installation hollow (Fig. 17 to 24) is provided in the base screed a physical shoulder hinge for the basic guide structure of the Ausziehbohle. By means of a clamping screw supported on the basic screed, the basic guide structure of the screed can be adjusted in the shoulder hinge to adjust the angle of the shoulder to be installed. Between the shoulder hinge and the base guide structure designed as a scissor lever mechanism height adjustment is arranged in order to change the height of the screed plate of the Ausziehbohle relative to the altitude of the screed plate of the base screed can. The pullout guide structure is telescopically slidable in the base guide structure. Since only the limited stroke of the Ausziehführungsstruktur in the basic guide structure can be used to change the working width, the working width can not be changed to double the plank width. In order not to pinch when depositing the working width between the Ausziehbohlen deposited on the ground paving, plow structures are formed at the front inner ends of the Ausziehbohlen. The screed screed plate is mounted to the screed frame attached to the pull-out guide structure.

At the US-A-4818140 known screed with front sliding on the base screed extenders trained with rails base guide structure is pivoted by means of a screw on the base board. In addition, the base guide structure via two spaced screw spindles is height adjustable relative to the base board. The screed screed plate is mounted on the housing-shaped extension guide structure slidable in the base guide structure over the screed frame and is divided into two parts in a bale pivoting area. A part can be pivoted up to form a berm relative to the side plate by means of an actuator. The actuator is supported on the pullout guide structure. The working width can not be changed up to twice the plank width.

At the US 2002/0106243 A1 and US 2002/0106242 A1 known screed is the Ausziehbohlen-screed plate divided by a Bermengelenk in a first inner section and a second outer Bermensektion. The entire Ausziehbohlen-screed plate can be tilted by a mechanism relative to Glättblechrahmen a parallel to the displacement transverse axis to individually change the angle of attack of the Ausziehbohlen-Glättbleches.

The invention has for its object to provide a structurally simple screed of the type mentioned, which allows a change in the working width to about twice the screed width, and at the risk of caused by weight or installation forces obstruction of adjustment movements of the Ausziehbohle relative to the base board is eliminated.

Only the shoulder angle of the Ausziehbohle is set in the invention according to claim 1 to the base guide structure in the base board. Thus, the base guide structure in the base board can be mounted easily and stably, and the height adjustment devices and vertical guides are loaded less. No height adjustments take place between the base guide structure, the guide substructure and the pull-out guide structure, so that the guide substructure and the pull-out guide structure can be made stable and simple and provide stable support for forces even when the pull-out screed is fully extended. The height adjustment and vertical guides functionally function only between the Ausziehführungsstruktur and the screed plate frame structure so that they can be structurally tuned to the motion and force conditions occurring there. The height adjustment devices and the vertical guides are loaded only by weight forces of the screed frame structure and the installation forces, but by no weight forces of the Ausziehführungsstruktur, the Führungssubstruktur and the base guide structure. Therefore, height adjustments can be made sensitively and quickly and without interference from parasitic forces.

Suitably, the base guide structure is stably supported in a fixed in the base pile shoulder hinge with a single, substantially parallel to the working direction axis. The at least one actuator anchored in the base beam for adjusting the shoulder angle of the extension screed, preferably a hydraulic cylinder, acts with respect to the shoulder hinge with a low-sized force arm on the base guide structure. Since the actuator does not need to make any height adjustments under the entire weight of the Ausziehbohle, but generates with favorable Kraftarm pivotal and supporting forces to the shoulder hinge, the Ausziehbohle is held stable at each angle setting in the base board. Although the principle according to the invention is very advantageous in at least one extension screed arranged at the front on the base screed, it could also be used with at least one screed mounted on the back of the base screed. Front and back refer to the working direction of the screed.

In an expedient embodiment, the shoulder hinge is arranged closer to the end of the base pile assigned to the extension sheet than the actuator, in order to achieve favorable power arm ratios.

Suitably, the base guide structure is a plate frame with two parallel guide tubes arranged within the base pile. This concept results in a very stable base guide structure with a long guide support length for the guide substructure.

The guide substructure is expediently a substructure frame with two first guide elements, which are displaceably guided in the guide tubes of the base guide structure, and two second guide elements which are offset and parallel to the first guide elements. Despite the small footprint, the two pairs of guide elements in the substructure frame result in high stability and large guide support lengths of the guide substructure.

Suitably, the Ausziehführungsstruktur is a frame with two spaced, perpendicular to the guide direction vertical plates and two fixed thereto, parallel guide tubes, which are guided on the second guide elements in the substructure frame slidably. The combination of the base guide structure with the Führungssubstruktur and the Ausziehführungsstruktur forms relative to each other telescoping component groups for the sum of the first and second shift strokes a change in working width to about twice the plank width allows, and between which even with fully ejected Ausziehbohle favorably long Führungsstützlängen between each two of the component groups are retained. The vertical plates of the Ausziehführungsstruktur perform a multiple function, since they stiffen the Ausziehführungsstruktur, and participate in the vertical guidance and the height adjustment of the screed frame structure.

In an expedient embodiment, the respective guide support length in the base guide structure, and for the Ausziehführungsstruktur about one third of the sum of the first and second shift strokes. This results in a very stable support of the extension screed against installation forces at fully extended screed.

In view of high stability and minimum installation space, the guide tubes of the base guide structure and the first of the second guide elements of the guide substructure lie approximately in a horizontal plane. On the other hand, the guide tubes of the extension guide structure and the two second guide elements of the guide substructure are approximately vertical one above the other. This results in a favorable, because spatial, and statically determined stability.

The height adjustment devices are expediently fixed at one end to at least one guide tube of the pull-out guide structure and at the other end to the screed plate frame structure and are therefore advantageously short. The vertical guides are provided between the screed frame structure and the vertical plates of the extension guide structure and may be relatively long.

Appropriately, the vertical guides of several guide pins interspersed slot guides z. B. in vertical supports of the vertical plates, for the screed plate frame structure. This slot guides can, preferably, be covered by fixed to the guide pin cover plates so that any lubricant deposits are included, and no built-in material can penetrate. The vertical guides keep installation forces away from the height adjustment devices, which thus operate without jamming.

Appropriately, the two height adjustment screw spindles, which are fixed in at least the Ausziehführungsstruktur fixed spindle blocks z. B. screwed, and fixed in the screed frame structure blocks z. B. are rotatably supported. The two screw spindles can be coupled to a common drive, for example a hydraulic motor or an electric gear motor, which can be mounted on the screed plate frame structure. Instead of screw spindles and hydraulic cylinders could be used.

In an expedient embodiment, in which with the extendable screed in addition to a flat roadway either a shoulder and a berm or just a shoulder or just a berm can be installed, characterized by the fact that the Ausziehbohlen-smoothing plate or the screed supporting, lower Frame is divided in an approximately parallel to the axis of the shoulder hinge hinge portion in a connected to a frame section first section and in a relatively pivotable second berms section. The upper frame of the screed frame structure supports the lower frame, which is divided into an inner frame section and an outer frame section to which the first and second sections of the screed sheet are attached. If both sections are set parallel to the screed screed plate, the screed builds a straight extension of the carriageway. The height adjustment allow each of the altitude of the rear lower edge of the Ausziehbohlen-Glättbleches in about Adjust to the height of the rear lower edge of the screed plate. The base guide structure and the sliding direction of the Ausziehbohle are then parallel to the base board. In the case of sections that are parallel to one another and the base guide structure pivoted in the shoulder hinge, on the other hand, the extension screed forms a shoulder. When set with their guiding direction to the base screed parallel base guide structure and relative to the first section pivoted second berms section forms the Ausziehbohle in the edge region of the road surface only a berm. If the pull-out guide structure in the shoulder hinge and the second boom section are pivoted relative to the first section, the pull-out pile forms a shoulder and a berm in the edge region of the road surface.

For setting the Bermenwinkels or the Bermen-end height of at least one actuator is arranged on the Ausziehbohlen-smoothing plate, which connects the first section over the hinge region away directly with the second section. The actuator adjusts and maintains the relative angle between both sections, optionally a fixed berm end position.

Suitably, the actuator operating between the screed or frame sections is a hydraulic cylinder or a jackscrew. When the actuator cooperates with a toggle mechanism, which can set, for example, mechanically limited end positions for the maximum beam angle and the parallel alignment of the two sections, the actuator is used only for adjustment and then less loaded, since the toggle mechanism receives and transmits the holding forces.

In a further expedient embodiment, in the screed plate frame structure, the angle of attack of the screed screed plate in the working direction and relative to the plane of the screed can be adjusted individually. For this purpose, the lower frame is tiltably supported on the upper frame in a direction parallel to the sliding direction, horizontal hinge axis. This hinge axis may be a physical hinge, or is defined, preferably, only by the resilience of the planar screed screed plate in this area relative to a mounting area on the screed frame structure. An attack angle adjustment device is mounted on the upper frame and engages at least on the first section of the Ausziehbohlen-Glättbleches or the lower frame. When the attack angle of the first section is changed, the attack angle of the second section also changes correspondingly over the berm-joint area.

A structurally simple embodiment of the attack angle adjusting device has an externally accessible from above in the Ausziehbohle screw, which is screwed into a mother body on the screed frame structure, and engages a mounted in the upper frame gear, which, preferably, several times at least with the coupled to the first section of the Ausziehbohlen-Glättbleches or the frame section. By screwing the screw in the nut body Ausziehbohlen-smoothing plate is pivoted at the front in working direction edge area relative to the rear in working direction of the hinge axis or bent there using the elasticity.

In an expedient embodiment, a convexly rounded end edge of one section engages in a concavely rounded end edge of the other section in the bosom hinge region between the first and second sections. By adjusting the second section relative to the first section no gap is opened by the matching end edges, which could be reflected in the surface of the road surface. To additionally stabilize the brow joint area, interlocking circular arc guide portions may be disposed on both scarf plate or frame sections which, together with the engagement between the end edges, define a stable hinge axis in the brow joint area.

In order to prevent the material to flow outwards beyond the working width, a side plate is mounted on the outer end of the extension screed on the upper frame of the screed plate frame structure, which protrudes forward in the working direction over the extension screed. The outer end of the second berm-section of the Ausziehbohlen-Glättbleches is movable relative to the side plate, so that when installing a berm the side plate forms the outer boundary of the lining layer.

In a further, important embodiment of pointing to the base board and in the working direction end of the first section of the Ausziehbohlen-Glättbleches z. B. on the frame section of the lower frame, a plow structure arranged peel off when pushed together the two Ausziehbohlen lying on the ground plan and can move forward. The plow structure is defined by a running in working direction edge portion of the first section of the Ausziehbohlen-Glättbleches, one from the edge portion and parallel to this from the bottom inside obliquely upwardly outwardly extending first Abweisfläche, and at least one directly adjoining second, approximately vertical deflecting surface, which opposite to the working direction of the inside obliquely outwards. This surface combination of the plow structure has fixed working width no appreciable influence on the built-in material that is installed between the extending screeds of the basic screed. On the other hand, during reduction of the working width by the plow structures, the paving structure is peeled off, raised and displaced inboard and forward before being installed by the base piling, the dynamic action of the plow structure preventing the paving material from becoming trapped between the pulled out planks ,

On the screed frame structure can vorneliegend a front wall be mounted in working direction, which extends from above in working direction in front of an upwardly bent retractable nose of Ausziehbohlen-Glättbleches down. This front wall, which is expediently supplemented by a front wall of the extending screed extended to the level of the pull-out guide structure, works as a scraper plate which sets a height-defined template for the screed for the screed screed plate, and relieves the screed scraper plate from being pulled in. Nose to a large extent of trailing forces of the insert.

Since the Ausziehführungsstruktur does not extend over the entire inner width of the Ausziehbohle, but only claims an internal width portion, weight is saved and the Ausziehführungsstruktur on the Führungssubstruktur a long second Verschiebehub allows. The Führungssubstruktur is about as wide as the Ausziehbohle. The width difference between the pullout guide structure and the guide substructure results in the second shift stroke.

In an expedient embodiment, the first horizontal actuator is disposed in the base board and hinged to the board frame of the base guide structure and to the frame of the guide substructure. In contrast, the second horizontal actuator is arranged in the Ausziehführungsstruktur, and connected on the one hand to a vertical plate of Ausziehführungsstruktur and the other part of the frame of the Führungssubstruktur.

In a further embodiment, the base screed on two connection carrier for Zugholme. Each connection carrier is pivotable about an approximately perpendicular to the working direction and horizontally oriented axis in the base pile. Between the base beam and the connection carrier an attack angle adjustment device for the angle of attack of the screed Glättbleches is provided. Thus, the angle of attack of the screed plate Glättbleches can be adjusted not only by the inclination angle of the Zugholme, but in addition or alternatively by a relative adjustment between the connection carriers and the base board.

Suitably, the base pile is further subdivided into two basic screed parts which are pivotably connected via a hinge which is approximately parallel to the working travel direction. Between the two base screed parts, a roof profile adjustment device may be provided. So can be installed with the same base board either a flat roadway or a roadway with a roof profile. It goes z. B. the screed smoothing plate without interruption, so that it is locally kinked or bent for a roof profile taking advantage of its restoring material elasticity. Alternatively, the screed screed could be split and the two screed halves could be connected in a middle joint.

Fig. 1

eine schematische Draufsicht auf einen Straßenfertiger mit einer Einbaubohle beim Einbauen eines Fahrbahnbelags in Arbeitsfahrtrichtung,

Fig. 2

eine schematische Hinteransicht des Straßenfertigers von Fig. 1,

Fig. 3

eine Perspektivansicht von schräg vorne oben, entgegengesetzt zur Arbeitsfahrt- richtung in den Fig. 1 und 2, einer Hälfte einer konkreten Ausführungsform einer Einbaubohle in einer Einstellung mit maximaler Arbeitsbreite,

Fig. 4

eine Perspektivansicht eines vergrößerten Details aus Fig. 3, in Blickrichtung von außen oben auf die Einbaubohle,

Fig. 5

eine Vorderansicht entgegensetzt zur Arbeitsfahrtrichtung, der Hälfte der Einbau- bohle von Fig. 3, wobei abdeckende Bauteile der Übersichtlichkeit halber wegge- lassen sind,

Fig. 6

eine Hinteransicht der Einbaubohle in Arbeitsfahrtrichtung bei Einbau einer Schul- ter, mit nur teilweise ausgeschobener Ausziehbohle,

Fig. 7

eine Perspektivansicht entgegengesetzt zur Arbeitsfahrtrichtung von außen oben, wobei zur Verdeutlichung abdeckende Bauteile der Ausziehbohle weggelassen sind,

Fig. 8

eine Hinteransicht eines Details der Ausziehbohle in Arbeitsfahrtrichtung bei Ein- bau einer Berme,

Fig. 9

eine Schemadarstellung einer Detailaltemative,

Fig. 10

eine Schemadarstellung eines Details eines Bermen-Gelenkbereichs, als Ergän- zung zu Fig. 8,

Fig. 11

eine Vorderansicht eines Details entgegensetzt zur Arbeitsfahrtrichtung, wobei abdeckende Bauteile weggelassen sind,

Fig. 12

eine Perspektivansicht eines Details der Einbaubohle, in Blickrichtung entgegen- gesetzt zur Arbeitsfahrtrichtung und von oben innen, bei geringer Arbeitsbreite der Einbaubohle, und

Fig. 13

eine perspektivische Ansicht oberer und unterer Rahmen einer Glättblech- Rahmenstruktur.

With reference to the drawings, embodiments of the subject invention will be explained. Show it:

Fig. 1

a schematic plan view of a paver with a screed when installing a road surface in working direction,

Fig. 2

a schematic rear view of the paver of Fig. 1 .

Fig. 3

a perspective view obliquely from the top front, opposite to the working direction in the Fig. 1 and 2 one half of a concrete embodiment of a screed in a setting with maximum working width,

Fig. 4

a perspective view of an enlarged detail Fig. 3 , in view from the outside at the top of the screed,

Fig. 5

a front view opposite to the working direction, half of the built-in screed of Fig. 3 , wherein covering components have been omitted for the sake of clarity,

Fig. 6

a rear view of the screed in working direction when installing a shoulder, with only partially pushed out screed,

Fig. 7

a perspective view opposite to the working direction of travel from the top outside, wherein for clarity, covering components of the Ausziehbohle are omitted,

Fig. 8

A rear view of a detail of the extension screed in working direction with the installation of a berm,

Fig. 9

a schematic representation of a detail altemative,

Fig. 10

a schematic representation of a detail of a Bermen joint area, as an addition to Fig. 8 .

Fig. 11

a front view of a detail opposite to the working direction, with covering components are omitted,

Fig. 12

a perspective view of a detail of the screed, in the opposite direction to the working direction and from above inside, with low working width of the screed, and

Fig. 13

a perspective view of upper and lower frame of a screed plate frame structure.

The Fig. 1 and 2 show in a schematic plan view and a schematic rear view of a paver F when installing a road surface M on a Planum P. The paver F entrains (working direction R) a screed E to Zugholmen 2, which hinged at tow points 1 on the paver F and on Anschlussträgem 3 ' the screed are firmly mounted. The tow points 1 are the same or different adjustable on both sides. Their height positions affect the layer thickness of the road surface M. The screed E consists of a base board G and at least one, in the illustrated embodiment two, preferably on the front side of the base board G in a linear displacement direction Z laterally slidably mounted Ausziehbohlen A. On the base board G and Each extractor A is at least one screed plate 10, 11 mounted on the bottom side. The screed plates 10, 11 level the surface of the road surface M and generate a compaction. The respective Ausziehbohle A could alternatively be mounted on the back of the base board G.

With the screed E, different road surfaces M and roadway profiles can be produced. In one case, the road surface M over the entire working width of the screed E has a flat continuous road surface 3. Optionally, the base beam G is divided in the middle and / or bendable to form a roof profile. If, as in the Fig. 1 and 2 shown in the working direction R left Extending Boom A with a shoulder angle α is pivoted relative to the base board G in a shoulder hinge 7 of the ground pile G, is installed at a side edge from a transition 6 a hanging with the angle α flat shoulder 4. In a further case, a berm 5 is subsequently installed on the shoulder 4, that is to say an embankment rising outward at an angle .beta. The berm 5 could also be installed without a shoulder 4 as an edge region of the flat road surface 3 or the road surface with a roof profile. The shoulder 4 and / or the berm 5 are installed by the screed plate 11 of the Ausziehbohle A. For the Berme 5 the Ausziehbohlen-smoothing plate 11 is divided in a Bermen joint area 8 with approximately parallel to the shoulder hinge 7 hinge axis in an inner first section 11a and a second outer, pivotable Bermen section 11b. At the outer end of each Ausziehbohle A, a side plate 9 is mounted, which extends over the screed plate 11 of the Ausziehbohle A in the working direction R forward and prevents the built-in material over the working width also flows out. When installing a road surface covering M with the roadway 3 and the shoulder 4, the width of the flat roadway surface 3 should remain unchanged in the event of changes in the working width by pushing in or pushing out the extendable boards A in the sliding direction Z. In connection areas of property entrances and / or cross streets, the working width is only temporarily increased, for example.

The pivotal support of each Ausziehbohle A in the base board G has the physical shoulder hinge 7 with substantially parallel to the working direction R joint axis 7a, wherein the shoulder hinge 7 (for adjusting the shoulder angle α of the Ausziehbohlen-Glättbleches 11) at or near the respective Extending screed A associated end of the base board G is located. The transverse to the direction of travel R seen width of each Extending Screed A and the Ausziehpohlenglättbleches 11 corresponds approximately to half the plank width, so that when fully extended Ausziehbohlen A, the maximum working width of double plank width corresponds approximately.

Part of screed E is a in Fig. 2 only schematically indicated telescopic guide system 12 to which an example of an upper frame 14 A and a lower frame 14 B ( Fig. 13 ) existing screed frame structure 14 for the screed plate 11 of the Ausziehbohle A via at least substantially perpendicular to the defined displacement direction Z arranged height adjustment devices 21 and vertical guides 20 is arranged vertically adjustable. Each side shield 9 is ( Fig. 8 ) attached to the upper frame 14 A of the screed frame 14, such that, as in Fig. 2 , left, shown, the second berm section 11b of the Ausziehbohlen-Glättbleches 11 relative to the side plate. 9 is pivotable, and the side plate 9 forms the lateral boundary of the built-in road surface layer M.

A concrete embodiment of the in the Fig. 1 and 2 only schematically indicated screed E is based on the Fig. 3 to 13 explained, with first on the perspective view of the working direction R right part of the screed in Fig. 3 , the perspective view of an essential area Fig. 3 in Fig. 4 , the front view in the direction opposite to the working direction R in Fig. 5 , and the rear view looking in working direction in Fig. 6 Reference is made.

In the Fig. 3 and 4 the telescopic guide system 12 consists of a base guide structure 18, which is pivotally mounted below and within a connection carrier 3 'for a tow bar 2 in the base beam G with the shoulder hinge 7 around the hinge axis 7a, a guide substructure 17 slidably guided in the base guide structure 18, and a slidably guided on the guide structure 17 Ausziehführungsstruktur 16, on which the screed plate frame structure 14 is mounted.

The base guide structure 18 is in the Fig. 3 . 4 and 6 of two spaced guide tubes 31, which are incorporated with plates 30 in a dimensionally stable plate frame. Parts of the shoulder hinge 7, which are connected via unspecified pins with corresponding shoulder hinge parts in the base board G, are attached to the roughly vertical plate 30, which is placed approximately under the connection carrier 3 '.

In the Fig. 3 and 4 is the basic management structure 18 accordingly Fig. 2 , Right side, adjusted so that the linear displacement direction Z is parallel to the base board G, ie, the angle α is 0 °. In Fig. 6 on the other hand, the base guide structure is pivoted about the hinge axis 7a of the shoulder hinge 7 with the angle α of, for example, at most 10%, by means of at least one actuator 45 (for example a hydraulic cylinder or a screw spindle device or any other suitable actuator) which is connected between an articulation point 44 at one Arm 30 'attached to the base guide structure 18 and an articulation point 46 are arranged in the base board G. Optionally, the actuator 45 or the arm 30 'is respectively applied against a stop, not shown, in the base board G in order to keep the pivotal position of the Ausziehbohle A stable.

The two guide tubes 31 of the base guide structure 18 are formed by two parallel guide elements 33, formed as rods or tubes, of the guide substructure 17 penetrated, which are fixed to two L-shaped end plates 32, and a first stroke H1 ( Fig. 4 ) relative to the base guide structure 18 by means of a first horizontal actuator 19 and are pushed back and forth. The first horizontal actuator 19 is supported, for example, on one of the plates 30 of the base guide structure 18 and is connected to one of the end plates 32. The first stroke H1 may be longer than the guide length of the base guide structure 18. In approximately the same horizontal plane as the two first guide elements 33 is parallel to and at a transverse distance an upper of two further rod or tubular guide elements 34 of the guide sub-structure 17 between the end plates 32 fixed. The second of the two further guide elements 34 is located at a distance approximately vertically below the upper second guide element 34 (FIG. Fig. 5 ).

The Ausziehführungsstruktur 16 is on the two second guide elements 34 of the guide sub-structure 17 via a second stroke H2 ( Fig. 4 ) guided displaceable. All displacement movements take place in the linear displacement direction Z of the telescopic guide system 12, whose orientation depends on the pivot position of the base guide structure 18 about the hinge axis 7a. The second stroke H2 is z. B. shorter than the first stroke H1, wherein ultimately the Ausziehführungsstruktur 16 relative to the base guide structure 18 with the sum of the stroke H1 and H2 can be pushed out. The second stroke H2 could be equal to or longer than the first stroke H1.

The Ausziehführungsstruktur 16 consists of two on the second guide elements 34 sliding guide tubes 36, whose ends between the end plates 32 of the Führungssubstruktur 17 via solid, vertical to the guide direction or displacement Z arranged, vertical support 35 supporting vertical plates 13 are connected. The guide support length of the guide sub-structure 17 in the base guide structure 18 corresponds to approximately half the guide support length of the pull-out guide structure 16 in the guide sub-structure 17. The pull-out guide structure 16 is shorter in the direction of displacement Z than the width of the extension pile A, while the screed frame structure 14 to the outer end of Extending screed A can extend.

The two height adjustment means 21 are associated with the vertical plates 13 and the vertical beams 35 and each consist of a attached to the Ausziehführungsstruktur 16 spindle block 26 in which a vertical screw 25 is screwed, and a screw spindle 25 rotatably holding block 27, either with the upper frame 14 A or with the upper frame 14 A with a vertical guide body 50 (FIG. Fig. 7 ) connecting struts 21 is connected. The screw 25 is relative short and carries at the lower end, for example, a sprocket 28, which is coupled via a chain drive 40 with a, for example, in the upper frame 14A arranged, two height adjustment devices 21 common drive 39. The drive 39 may be a hydraulic motor or an electric geared motor. Alternatively, the two height adjustment devices 21 could also be formed by hydraulic cylinders or other suitable actuators. The vertical guide body 50 are z. B. on the front sides of the vertical support 35 of the Ausziehführungsstruktur 16 by means of a series of spaced guide pins 43 guided linearly displaceable z. B. with sliding blocks 22 ( Fig. 7 ) engage in oblong holes 43a through cover plates 51 (FIG. Fig. 5 ) can be covered. The cover plates 51 are secured for example by screwed onto the guide pin 43 nuts. By the way, it can be a in Fig. 5 not shown front housing cover of the Ausziehbohle A be provided, the, z. B. down to above the upper frame 14 A and in working direction in front of the Ausziehbohlenglättblech 11 downwardly engaging front walls 67 may be performed.

The mounted on the lower frame 14 B Ausziehbohlen-smoothing plate 11 is the front side, for example, via a plurality of fasteners 42 directly or indirectly and in the working direction of R rear area ( Fig. 8 and 13 ) via connecting elements 54 and 66 articulated (hinge axis 65, Fig. 13 ) is connected to the upper frame 14 A. Shown are connecting elements 42 between the upper frame 14A and an inner frame section 14Ba of the divided lower frame 14B (FIG. Fig. 13 ).

In Fig. 8 and 13 is the Ausziehbohlen-smoothing plate 11, at least the first section 11a, relative to the upper frame 14 A about a transverse to the working direction R lying about ground-parallel hinge axis 65 tilted to adjust the Ausziehbohle A another screed attack angle relative to Planum P. , as the screed attack angle of the basic scaffold G. The in Fig. 8 and 13 indicated hinge axis 65 may (as shown) be a physical hinge axis between the connecting elements 54, 56 on the upper frame 14A and the frame section 14Ba, or is (not shown) by the resilient resiliency of the fixed-mounted Ausziekbügel-Glättbleches 11, ie the section 11a, defined ,

An attack angle adjuster 23 serving to tilt the screed screed plate 11 is provided in the screed plate frame structure 14. An upward obliquely outwardly pointing screw 41 is screwed into a nut body 53 on the upper frame 14A. A the screwing movement of the screw 41 in a linear movement implementing gear device is in bearings 38 ( Fig. 5 ) stored inside the upper frame 14 A and in detail from the Fig. 11 and 13 to recognize.

In the Fig. 11 and 13 engages the screw 41 at the lower end below the upper frame 14 A supported Muttemkörpers 53 to a triangular rotary member 63 which is mounted in the bearing 38 in the upper frame 14 A. This triangular rotary member 63 is coupled via a link 64 with a similar triangular rotary member 63 for common rotational movement. The second rotary member 63 is also rotatably supported in a bearing 38 in the upper frame 14 A. With both rotary bodies 63, the connecting elements 42 are connected (already Fig. 5 mentioned), which may be formed, for example, as turnbuckles for fine adjustment, and front side attack on the top of the frame section 14Ba or the smoothing plate section 11a. The second berm section 11b on the frame section 14Bb is above the brow joint area 8 behind the front wall 67, which acts as a scraper over an upwardly curved retraction nose 68 (FIG. Fig. 12 ) of the Ausziehbohlen-Glättbleches engages down, connected to the first section 11a, so that the second Bermen section 11b on the hinge portion 8 each have the same angle of attack relative to Planum, as set for the first section 11a with the screw 41. By means of the connecting elements 42, the first section 11a is pivoted or bent relative to the upper frame 14A about the hinge axis 65 lying at the rear end space of the Ausziehbohlen-Glättblechs 11.

In the Fig. 5 . 6 . 11 is an on the top of the second berm section 11b or frame section 14Bb hinged actuator 37, z. For example, a hydraulic cylinder shown bridging the berm-hinge region 8 and connected to the other frame section 14Ba. The actuator 37 sets the second berm section 11b either as in FIG Fig. 5 shown in parallel and in alignment with the first section 11a (for mounting either only one shoulder or no shoulder 4 in the Fig. 1 and 2 ), or with a Bermen angle β ( Fig. 2 ) z. B. to a predetermined end position, as in Fig. 8 hinted to incorporate a Berme 5. In the setting of Fig. 8 the outer end of the second berm section 11b has moved upwards relative to the side plate 9. The articulation point of the actuator 37 on the frame section 14Ba is otherwise in Fig. 8 with 57 highlighted.

The Ausziehbohlen-smoothing plate 11 and / or the lower frame 14 B could each be integrally formed continuously, since the possibility to incorporate a Berme is a convenient option of the screed E is. Also the attack angle adjustment device 23 may be an optional equipment of the screed. The screw 41 can also by other suitable actuators such. B. hydraulic cylinder, electric Hubspindeltriebe be replaced. Furthermore, it is possible to arrange the actuator 37 and connecting members on the upper frame 14A, and the frame section 14Bb of the lower frame 14B, e.g. B. to adjust for a berm from above.

As a further optional equipment can in principle the screed angle attack angle of the screed relative to the Anschlussträgem 3 'with an attack angle adjustment according to the Fig. 5 and 7 vary without the tow points 1 ( Fig. 1 ) to adjust the Zugholme 2. For this purpose, each connection carrier 3 ', which has a connection plate 52 for fastening one end of a Zugholms 2, about a parallel to the sliding direction Z axis 47 (FIGS. Fig. 7 ) pivotable in the base G. A vertical support 49 fixedly connected to the base beam G extends adjacent to the connection support 3 '. Between the connection support 3 'and the vertical support 49, an actuator 48 for individual adjustment of the angle of attack of the base board G is arranged relative to the plane and to the Zugholm 2 firmly connected connection carrier 3'. A functionally similar adjustment device could alternatively be provided directly between the towbar 2 and the connection carrier 3 '(not shown).

As a further optional feature of the screed E is at the inner end of each Ausziehbohle A plow structure 15 ( Fig. 3 . Fig. 5 and Fig. 12 ), whose task is to peel off the base board G lying on the Planum P when pushing together the Ausziehbohlen A from Planum and submit the Ausziehbohlen-smoothing plate 11, which incorporates this material in the roadway M, until the Ausziehbohlen A finally in the Center of the base board G lie together, without being obstructed when pushed together by jammed paving.

The plow structure 15 ( Fig. 5 and 12 ) begins at a parallel to the working direction R inner edge 69 of the Ausziehbohlen-Glättbleches 11 (section 11 a) and has a rising from the inner edge 69 obliquely upwardly outwardly first Abweisfläche 70 at least. Along an oblique intersecting line 72, a second, substantially vertical deflecting surface 71 adjoins the first deflecting surface 70. The intersecting line 72 begins in the working direction R front at a higher point of the first Abweisfläche 70 and extends obliquely down to a low position of the first Abweisfläche 70. The vertical second Abweisfläche 71 has its rear edge at the rear in the working direction end of the inner edge 69 and runs from there starting in Working direction R obliquely outwards. The plow structure 15 may also be fixed to the frame section 14Ba of the lower frame 14B.

The plow structure 15 may alternatively be represented by a sheet bent integrally with a curvature. Further, a one-piece sheet may have a plurality of intersections or bending edges in the manner of the intersecting line 72, and divide the plow structure into any number of sub-segments such as 70 and 71 (not shown).

In Fig. 6 (View in working direction R from behind), the first linear actuator 19, the Führungssubstruktur 17 has been inserted relative to the base guide structure 18 over the first stroke H1, while the Ausziehführungsstruktur 16 from the second linear actuator 29 in the in Fig. 3 shown sliding position on the Führungssubstruktur 17 is arranged, so that the Ausziehbohle A is only partially extended. An angle α> 0 ° is set (level road surface 3). To the Ausziehbohle A in the fully inserted position according to Fig. 12 bring the second linear actuator 29, the Ausziehführungsstruktur 16 from in Fig. 4 shown position until the in Fig. 4 upper vertical plate 13 in the in Fig. 4 lying above the end plate 32 of the Führungssubstruktur 17, accordingly Fig. 12 , The viewed in the direction of displacement Z extension of the Führungssubstruktur 17 corresponds approximately to the inner width of the Ausziehbohle A, while seen in the sliding direction Z extension of the pull-16 with its vertical plates 13 z. B. is only slightly larger than half the inner width of the Ausziehbohle A. By this relative dimensioning of the additional second Verschiebehub H2 between the Führungssubstruktur 17 and the Ausziehführungsstruktur 16 is achieved, while the large extension of the Führungssubstruktur 17 in the sliding direction Z in relation to the guide support length of Base guide structure 18 of the relatively long first displacement stroke H1 is obtained.

As usual, heating and vibration devices and the like may be included in the base board G and in the extending boards A.

Fig. 9 schematically illustrates a detail variant in which the actuator 37 for adjusting the Bermenwinkels β, the z. B. on the section 11a or the frame section 14Ba is hinged at 58, not directly on the berms section 11b attacks, but on a toggle mechanism 55, in a pivot bearing 57 in the frame section 14Bb or the second berm section 11b and in a Abutment 57 is hinged to the upper frame 14 A, wherein indicated fixed stops may be provided which define two extreme positions of the toggle mechanism 55. For example, when stretched Toggle mechanism 55, the second boom section 11b in Bermen joint area 8 with the first section 11a aligned (there is no berm installed) and in a second, defined by a stop, kinked extreme position with the angle β pivoted (there is a berm installed) ,

Fig. 10 illustrates schematically as a further option, a training of Bermen joint region 8 between the sections 11a, 11b of the Ausziehbohlen-Glättbleches 11. An end edge 74 of the first section 11a, for example, following a circular arc convex rounded. On the other hand, an end edge 73 of the second berm section 11b is likewise rounded concavely following a circular arc with essentially the same radius. The end edges 73, 74 engage each other precisely, so that when pivoting the second section 11b on the underside of the Ausziehbohlen-Glättbleches 11 no gap is opened, which could form in the surface of the road surface m. In order to stabilize the pivoting movement of the interlocking end edges 73, 74 in the boom pivoting area 8 and to support the sections 11a, 11b, arcuate guide elements 59 are also provided on the upper sides of the sections 11a, 11b or the frame section 14Ba, 14Bb at at least one point of the pivoting area 8. 62 defined, which have at least one transverse pin 60 and an arcuate guide slot 61 in order to achieve a concentric to the axis in the hinge region 8 guiding and supporting function.

In the Fig. 3 . 5 . 6 and 12 Finally, a roof profile adjusting device 73 (FIG. Fig. 3 ) the base girder G is shown as optional equipment. The base board G is adjustable in the middle about a parallel to the working direction R axis 74 of the screed Glättblechs 10 to form a roof profile. The roof profile adjusting device 73 ( Fig. 3 ) Functionally acts between two screed halves, the screed 10 z. B. goes through the axis 74 without interruption and bends or buckles thanks to its elasticity when the base screed halves are adjusted. The usual, at the vorneliegenden in working direction longitudinal edge of the Glättblechs 10 nose bent nose 76 (in the rear view of Fig. 6 for example) is interrupted in a V-shaped area 75 in order to facilitate the easier bending and resetting of the in itself flat, plate-shaped Glättblechs 10 in the axis 74.

A two-part design of the screed plate 10 and a joint defining the axis 74 between the base screed parts is alternatively possible for setting a roof profile.

Claims (24)

Screed (E) for a road paver (F), with
a base screed (G) and at least one screed (A) which is displaced in a working direction R on the base screed (G) and displaceable relative to the base screed (G) laterally in a linear displacement direction (Z),
a base guide structure (18) for the extension screed (A), the base guide structure (18) being pivotable in a pivoting support of the base screed (G),
a guide substructure (17) guided in the base guide structure (18) and at least one first actuator (19) for displacing the guide substructure (17) over a first stroke (H1) relative to the base guide structure (18),
a pullout guide structure (16) guided in the guide substructure (17), and at least one second actuator (29) for displacing the pullout guide structure (16) via a second stroke (H2) relative to the guide substructure (17),
a screed frame structure (14) mounted on the extension guide structure (13) with a screed screed plate (11), and
between the screed plate frame structure (14) and the Ausziehführungsstruktur (13) provided to the displacement direction (Z) at least substantially vertical vertical guides (20) and height adjustment means (21) for height adjustment of the screed plate frame structure (14) parallel to itself and relative to the base guide structure (18). Screed according to claim 1, characterized in that the base guide structure (18) in a Schenkabstützung defining, in the base board (G) fixed shoulder hinge (7) is mounted at least substantially to the working direction (R) parallel hinge axis (7a), in that at least one actuator (45) anchored in the base beam (G), preferably a hydraulic cylinder, engages the base guide structure (18) at a distance from the shoulder hinge (7), and that the extension board (A) is arranged on the front side of the base board (G) , Screed according to claim 2, characterized in that the shoulder hinge (7) closer to the extension of the screed (A) associated end of the base board (G) is arranged, as the actuator (45). Screed according to claim 1, characterized in that the base guide structure (18) within the base board (G) arranged plate frame with two parallel guide tubes (31). The screed according to claim 1, characterized in that the guide substructure (17) has two first guide elements (33) slidably guided in the guide tubes (31) of the base guide structure (18) between end plates (32) and two second ones between the end plates (32) , relative to the first offset and parallel guide elements (34) are fixed. Screed according to claim 1, characterized in that the Ausziehführungsstruktur (16) has two spaced, perpendicular to the guide direction (Z) vertical plates (13) and between these two fixed guide tubes (36) on the second guide elements (34) of the Führungssubstruktur (17 ) are guided displaceably. Screed according to at least one of the preceding claims, characterized in that the guide support length of the first guide elements (33) in the guide tubes (31) of the base guide structure (18) in about one third and in the guide tubes (36) of the Ausziehführungsstruktur (16) about two thirds is the sum of the first and second strokes (H1, H2). Screed according to claims 4 and 5, characterized in that the guide tubes (31) of the base guide structure (18) and the first guide elements (33) lie approximately horizontally next to each other, and that next to the guide tubes (36) of the Ausziehführungsstruktur (16) and the second guide elements (34) lie approximately vertically above one another. Screed according to claim 1, characterized in that the height adjustment means (21) are supported at one end on the Ausziehführungsstruktur (16) and at the other end of the screed plate frame structure (14), and that the vertical guides (20), preferably, to the Vertical plates (35) are arranged vertical plates (13) of the Ausziehführungsstruktur (16) provided. Screed according to claim 9, characterized in that the vertical guides (20) of several guide pins (43) enforced slots (43 a) in guide bodies (50) for the screed frame structure (14), and in that the slots (43 a), preferably, are covered by the guide pin (43) fixed cover plates (51). Screed according to claim 1, characterized in that the height adjustment devices (21) have two screw spindles (25) which can be screwed into spindle blocks (26) fixed in at least the extension guide structure (16) and blocks (27) fixed in the screed plate frame structure (14) ) are rotatably supported, and that the screw spindles (25) is assigned a common drive (39), preferably on the screed plate frame structure (14), a hydraulic motor or an electric geared motor. Screed according to claim 1, characterized in that the Ausziehbohlen-smoothing plate (11) in an approximately to the shoulder hinge (7) parallel Bermen joint region (8) in one with an upper frame (14A) of the screed frame structure (14) connected first inner section (11a) and in a relative to the upper frame (14A) pivotable and external second berm section (11b) is divided. Screed according to claim 12, characterized in that on the Ausziehbohlen-screed plate (11) between the sections (11a, 11b) or between frame sections (14Ba, 14Bb) of a lower frame (14B) of the screed frame structure (14) at least one Bermenwinkel- Adjusting actuator (37) is arranged. Screed according to claim 13, characterized in that the Bermenwinkel adjustment actuator (37) comprises a hydraulic cylinder or a screw spindle, preferably combined with a toggle mechanism (55). Screed according to claim 1, characterized in that the Ausziehbohlen-smoothing plate (11) with a lower frame (14B) of the screed frame structure (14) for individual adjustment of an angle of attack of the Ausziehbohle (A) in a direction of displacement (Z) in approximately parallel Articulated axis (65) is tiltably supported against an upper frame (14A) of the screed frame structure (14), preferably in one of the elasticity of the Ausziehbohlen-Glättblechs (11) using Mounting area, and that on the screed frame structure (14) an attack angle adjusting device (23) is mounted, which engages at least on a first section (11a) of the Ausziehbohlen-Glättblechs (11). Screed according to claim 15, characterized in that the attack angle adjusting device (23) has a screw spindle (41) which is screwed into a nut body (23) on the upper frame (14A) of the screed plate frame structure (14) and at one in the upper Frame (14A) mounted gear (63, 64) engages which at least twice with the first section (11a) or a frame section (14Ba) of the lower frame (14B) of the Ausziehbohlen-Glättbleches (11) is coupled. Screed according to claim 12, characterized in that in the berm-hinge region (8) a convexly rounded end edge (74) of one section (11a) engages in a concavely rounded end edge (73) of the other section (11b), and that on both sections ( 11a, 11b) or the frame sections (14Ba, 14Bb) intermeshing circular arc guide members (59, 62) for the hinge region (8) are arranged. Screed according to claim 12, characterized in that a side shield (9) is mounted on the outer end of the upper frame (14A) of the screed plate frame structure (14), and in that the second boom section (11b) of the screed screed plate (11) in the hinge region (8) relative to the side plate (9) is pivotable. Screed according to claim 1 or claim 12, characterized in that at the bottom of the screed (G) facing the Ausziehbohlen-Glättbleches (11) and the screed plate frame structure (14) a plow structure (15) is provided by a parallel to the working direction (R) extending edge portion (69) of the Ausziehbohlen-Glättblechs (11), one of the edge portion (69) obliquely from above obliquely upwardly extending first Abweisfläche (70), and at least one subsequent second, approximately vertical deflection surface (71) is defined , which opposite to the working direction (R) extends from the inside obliquely outwards, wherein the Abweisflächen (70, 71) arranged at an angle to each other or incorporated into a curvature. Screed according to claim 1, characterized in that the first horizontal actuator (19) in the base board (G) is arranged and on the plate frame (30) of the base guide structure (18) and an end plate (32) of the Führungssubstruktur (17) engages, and in that the second horizontal actuator (29) is arranged between the plate frame (30) of the base guide structure (18) and a vertical plate (13) of the pull-out guide structure (16). Screed according to claim 5, characterized in that the two first guide elements (33) and one of the two second guide elements (34) of the guide substructure (17) are arranged approximately in a common horizontal plane. Screed according to at least one of the preceding claims, characterized in that the base board (G) has two connection carriers (3 ') for drawbars (2), that each connection carrier (3') about an approximately perpendicular to the working direction (R) and horizontally oriented axis (47) in the base board (G) is pivotable, and that between the base board (G) and the connection carrier (3 ') an attack angle adjustment device (48) is provided. Screed according to at least one of the preceding claims, characterized in that the base board (G) is divided into two approximately equal width, about an axis of movement (R) approximately parallel axis (74) pivotally connected base plank parts, and that between the Baseboard parts a roof profile (Crown Profile) adjustment device (73) is provided, wherein, preferably, the axis (74) is a desired bending point in the continuous continuous screed-smoothing plate (10). Screed according to at least one of the preceding claims, characterized in that in the displacement direction (Z) seen width of the Ausziehführungsstruktur (16) is narrower than in the sliding direction (Z) seen width of the Führungssubstruktur (17) and the width of the screed plate frame structure (14 ).

Images