Paving screed assembly and road paver

Abstract

The utility model relates to a paving screed plate assembly for a road paver, which comprises a main screed plate, a main screed plate and a main screed plate sliding plate, and a secondary screed comprising a screed plate support and a secondary screed plate in contact with the paving material and attached to the screed plate support to tilt about a tilt axis. The paving screed plate assembly comprises a height adjusting device which is constructed to lift the flat plate bracket relative to the main screed plate; and a tilting device configured to vary the tilt angle of the secondary screed plate about the tilt axis. The height adjustment device and the tilting device are functionally coupled such that when the skateboard support is lifted by the height adjustment device relative to the primary screed, the tilting device is automatically actuated to change the tilt angle of the secondary screed skateboard about the tilt axis; or when the inclination angle of the auxiliary screed plate around the inclination axis is changed by the inclination device, the height adjusting device is automatically actuated to lift the screed plate support relative to the main screed plate. The utility model also relates to a road paver.

Description

Technical Field

[0001] The utility model relates to a paving screed assembly (Einbau-bohlenanordnung) for a road paver. Background Art

[0002] From EP 2 199 467 A1 a paving screed for a road paver is known, which comprises a base screed and an extension screed. The extension screed can be moved relative to the base screed in a displacement direction in order to change the working width. Each extension screed is supported by an extension guide structure on a guide fixed to the base screed. A smoothing plate is arranged at the bottom of the base screed and the extension screed. The extension screed comprises a frame with a smoothing plate of the extension screed. A vertical adjustment device actuable by a drive is provided between the extension guide structure and the frame of the extension screed for adjusting the height of the frame relative to the extension guide structure.

[0003] Other paving screeds having a base screed and an extension screed which is movable relative to the base screed are known, for example, from EP 1 031 660 A1, EP 2 199 466 A1 and EP 2 218 824 A1. Utility Model Content

[0004] According to one aspect of the utility model, a paving screed assembly for a road paver is provided. The paving screed assembly includes a main screed and an auxiliary screed. The main screed includes a main screed smoothing plate for contacting with a paving material. The auxiliary screed includes a smoothing plate support and an auxiliary screed smoothing plate. The auxiliary screed smoothing plate is configured to contact the paving material. The auxiliary screed smoothing plate is fixed to the smoothing plate support so that it can be tilted around a tilting axis. The paving screed assembly includes a height adjustment device and a tilting device. The height adjustment device is configured to lower or raise the smoothing plate support relative to the main screed. The tilting device is configured to change the tilt angle of the auxiliary screed smoothing plate around the tilting axis. According to a first variant, the height adjustment device and the tilting device are functionally coupled so that when the smoothing plate support is lowered or raised relative to the main screed by the height adjustment device, the tilting device is automatically actuated to change the tilt angle of the auxiliary screed smoothing plate around the tilting axis. According to a second variant, the height adjustment device and the tilting device are functionally coupled so that when the tilt angle of the secondary screed smoothing plate about the tilting axis is changed by the tilting device, the height adjustment device is automatically actuated to lower or raise the smoothing plate support relative to the primary screed. The functional coupling of the height adjustment device and the tilting device can be designed according to the first variant and / or the second variant.

[0005] The paving screed assembly may be configured to form a road paver together with a tractor. The paving screed assembly may be attached to the tractor so as to be towed by the tractor. The paving screed assembly may be configured to be pulled behind the tractor in a paving travel direction.

[0006] The paving screed assembly may be configured to compact paving material, in particular asphalt paving material, on a roadbed. The paving screed assembly may be configured to smooth paving material, in particular asphalt paving material, on a roadbed.

[0007] The transverse direction is defined as a direction extending in a horizontal plane and perpendicular to the paving travel direction. The lateral direction or width direction may be a direction parallel to the transverse direction.

[0008] The tilting axis may extend transversely to the paving travel direction.The tilting axis may extend parallel to the transverse direction.

[0009] The secondary screed smoothing board may extend at least partially laterally beyond the primary screed smoothing board.The secondary screed may be configured to provide an increased paving width compared to a paving width of the primary screed.

[0010] The auxiliary screed plate may be designed to be movable in a transverse direction relative to the main screed plate. The auxiliary screed plate may be designed as an extendable portion, which may extend outwardly from the main screed plate in a transverse direction to widen the overall paving width of the paving screed plate assembly. The paving screed plate assembly may include a paving width adjustment device, which is configured to move the auxiliary screed plate in a transverse direction relative to the main screed plate.

[0011] As an alternative to an auxiliary screed being movable in transverse direction relative to the main screed, the auxiliary screed can be attached to the main screed non-movably in transverse direction.At least a portion of the auxiliary screed may be rigidly connected to the main screed.

[0012] The auxiliary screed plate may be arranged completely or partially in front of the main screed plate with respect to the paving travel direction. The auxiliary screed plate may be arranged completely or partially behind the main screed plate with respect to the paving travel direction. The auxiliary screed plate may extend beyond the main screed plate in the paving travel direction. The auxiliary screed plate may extend beyond the main screed plate in the direction opposite to the paving travel direction.

[0013] The secondary screed smoothing plate may be arranged completely or partially in front of the primary screed smoothing plate with respect to the paving travel direction. The secondary screed smoothing plate may be arranged completely or partially behind the primary screed smoothing plate with respect to the paving travel direction. The primary screed smoothing plate and the secondary screed smoothing plate may be arranged exactly one after the other (without overlapping) or overlappingly in the paving travel direction. The secondary screed smoothing plate may be directly connected to the primary screed smoothing plate in the paving travel direction or counter to the paving travel direction. The distance between the primary screed smoothing plate and the secondary screed smoothing plate in the paving travel direction may be, for example, less than 50 cm, or less than 20 cm, or less than 10 cm, or less than 5 cm, or between 15 cm and 90 cm. In particular, the distance between the primary screed smoothing plate and the secondary screed smoothing plate in the paving travel direction may be, for example, 20 cm or 40 cm or 55 cm or 85 cm.

[0014] The length of the main screed plate smoothing board along the paving travel direction may be different from the length of the auxiliary screed plate smoothing board along the paving travel direction. The length of the auxiliary screed plate smoothing board along the paving travel direction may be less than the length of the main screed plate smoothing board along the paving travel direction. The length of the auxiliary screed plate smoothing board along the paving travel direction may be a maximum of 80%, or a maximum of 70%, or a maximum of 60%, or a maximum of 50% of the length of the main screed plate smoothing board along the paving travel direction. The length of the auxiliary screed plate smoothing board along the paving travel direction may be at least 20%, or at least 30%, or at least 40%, or at least 50% of the length of the main screed plate smoothing board along the paving travel direction. The length of the auxiliary screed plate smoothing board along the paving travel direction may be between 30% and 70%, or between 40% and 60%, or between 45% and 55% of the length of the main screed plate smoothing board along the paving travel direction. The length of the auxiliary screed plate smoothing board along the paving travel direction may be at least approximately 50% of the length of the main screed plate smoothing board along the paving travel direction.

[0015] The length of the primary screed smoothing board in the paving travel direction may at least substantially correspond to the length of the secondary screed smoothing board in the paving travel direction.

[0016] The length of the main screed plate smoothing board along the paving direction may be smaller than the length of the auxiliary screed plate smoothing board along the paving direction.

[0017] The secondary screed plate can be configured to be tilted as a whole about an axis extending parallel to the paving travel direction. The secondary screed plate can be configured to be tilted relative to the primary screed plate about an axis extending parallel to the paving travel direction. For example, by tilting the secondary screed plate about an axis extending parallel to the paving travel direction, paving of roof profiles or inclined road surfaces can be simplified.

[0018] The paving screed assembly may be configured to be tiltable as a whole about a general axis extending parallel to the transverse direction. The tilted position of the screed assembly as a whole about the general axis may determine the angle of attack of the main screed smoothing plates relative to the horizontal. The angle of attack of the main screed smoothing plates may influence the degree of compaction by the main screed. The greater the angle of attack of the main screed smoothing plates, the greater the degree of compaction.

[0019] If the paving screed assembly is generally tilted about the central axis, a height offset will occur between the rear edge of the primary screed plate and the rear edge of the secondary screed plate. During paving operation, this height offset may lead to undesired steps in the paved covering. By lowering or raising the plate support of the secondary screed plate relative to the primary screed plate by means of a height adjustment device, the height offset between the rear edge of the primary screed plate and the rear edge of the secondary screed plate can be compensated.

[0020] When the smoothing plate support is lowered or raised by the height adjustment device, the tilting axis may also be lowered or raised. When the smoothing plate support is lowered or raised by the height adjustment device, the secondary screed smoothing plate may also be lowered or raised. The height adjustment device may be configured to lower or raise the smoothing plate support, the secondary screed smoothing plate and the tilting axis together relative to the primary screed. The height adjustment device may be configured to lower or raise the smoothing plate support, the secondary screed smoothing plate and the tilting axis together relative to the primary screed as a unit.

[0021] The height difference between the front edge of the primary screed plate and the rear edge of the primary screed plate may be referred to as the feed height of the primary screed plate. The height difference between the front edge of the secondary screed plate and the rear edge of the secondary screed plate may be referred to as the feed height of the secondary screed plate.

[0022] For example, by tilting the paving screed assembly as a whole about the central axis and / or by raising or lowering the paving plate support relative to the main screed by means of a height adjustment device, it may happen that the feed height of the secondary screed paving plate differs from the feed height of the primary screed paving plate, which may undesirably cause the paving material in the area of ​​the main screed and in the area of ​​the secondary screed to be compacted to different degrees.

[0023] The tilting device may be configured to change the angle of attack of the secondary screed plate by changing the tilting angle of the secondary screed plate about the tilting axis. The tilting device may be configured to change the feed height of the secondary screed plate by changing the tilting angle of the secondary screed plate about the tilting axis, in particular to adapt it to the feed height of the primary screed plate. The tilting device may be configured to change the angle of attack of the secondary screed plate by changing the tilting angle of the secondary screed plate about the tilting axis, thereby also changing the feed height of the secondary screed plate.

[0024] Due to the coupling of the height adjustment device with the tilting device, the adjustment process of the auxiliary ironing plate during operation can be simplified. By coupling the height adjustment device with the tilting device, operating errors can be avoided or reduced.

[0025] The height adjustment device and the tilting device can be coupled so that the smoothing plate support is lowered or raised relative to the main screed plate by the height adjustment device and the tilting device simultaneously changes the tilt angle of the secondary screed plate in conjunction with the smoothing plate. The height adjustment device and the tilting device can be coupled so that the tilting device changes the tilt angle of the secondary screed plate and the smoothing plate support is simultaneously lowered or raised relative to the main screed plate by the height adjustment device. If the lowering or raising of the smoothing plate support relative to the main screed plate and the change of the tilt angle of the secondary screed plate about the tilting axis are carried out simultaneously, the duration of the adjustment process of the secondary screed plate can be shortened, which can lead in particular to improved paving results.

[0026] The height adjustment device and the tilting device can be coupled so that the lowering or raising of the smoothing plate support relative to the primary screed plate by the height adjustment device is in a fixed ratio to the change of the tilting angle of the secondary screed plate smoothing plate about the tilting axis by the tilting device. The fixed ratio can be appropriately selected based on the geometry of the primary screed plate and the secondary screed plate and the mutual arrangement of the primary screed plate and the secondary screed plate.

[0027] The height adjustment device and the tilting device can be coupled so that when the smoothing plate support is lowered or raised relative to the main screed plate by the height adjustment device, the tilting device is automatically actuated to change the tilt angle of the secondary screed plate about the tilting axis, thereby partially or completely compensating for the difference between the feed height of the main screed plate and the feed height of the secondary screed plate.

[0028] By automatically actuating the tilting device when lowering or raising the smoothing plate support relative to the main screed plate, the adjustment process of the auxiliary screed plate during operation can be simplified. Due to the coupling of the height adjustment device to the tilting device, lowering or raising the smoothing plate support relative to the main screed plate always enables an immediate change of the tilt angle of the auxiliary screed plate about the tilt axis. A separate adjustment of the tilt angle of the auxiliary screed plate about the tilt axis can be omitted or simplified.

[0029] In particular, if the auxiliary screed plate is completely or partially located in front of the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the smooth plate support is lowered by the height adjustment device, and the tilting device is actuated to tilt the auxiliary screed plate around the tilting axis to increase the attack angle of the auxiliary screed plate relative to the roadbed. In particular, if the auxiliary screed plate is completely or partially located in front of the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the smooth plate support is raised by the height adjustment device, and the tilting device is actuated to tilt the auxiliary screed plate around the tilting axis to reduce the attack angle of the auxiliary screed plate relative to the roadbed.

[0030] In particular, if the auxiliary screed plate is completely or partially behind the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the smooth plate support is lowered by the height adjustment device, and the tilting device is actuated to tilt the auxiliary screed plate around the tilting axis to reduce the attack angle of the auxiliary screed plate relative to the roadbed. In particular, if the auxiliary screed plate is completely or partially behind the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the smooth plate support is raised by the height adjustment device, and the tilting device is actuated to tilt the auxiliary screed plate around the tilting axis to increase the attack angle of the auxiliary screed plate relative to the roadbed.

[0031] The height adjustment device and the tilting device can be coupled so that when the tilting angle of the secondary screed smoothing plate about the tilting axis is changed by the tilting device, the height adjustment device is automatically actuated to lower or raise the smoothing plate support relative to the main screed, thereby partially or completely compensating for the height difference between the rear edge of the main screed smoothing plate and the rear edge of the secondary screed smoothing plate.

[0032] By automatically actuating the height adjustment device when changing the inclination angle of the auxiliary screed plate about the inclination axis, the adjustment process of the auxiliary screed plate during operation can be simplified. Due to the coupling of the height adjustment device to the inclination device, changing the inclination angle of the auxiliary screed plate about the inclination axis always results in a lowering or raising of the smoothing plate support relative to the main screed plate. A separate lowering or raising of the smoothing plate support relative to the main screed plate can be eliminated or simplified.

[0033] In particular, if the auxiliary screed plate is completely or partially located in front of the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the auxiliary screed plate is tilted around the tilting axis to increase the angle of attack of the auxiliary screed plate relative to the roadbed through the tilting device, so that the height adjustment device is actuated to lower the smooth plate support. In particular, if the auxiliary screed plate is completely or partially located in front of the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the auxiliary screed plate is tilted around the tilting axis to reduce the angle of attack of the auxiliary screed plate relative to the roadbed through the tilting device, so that the height adjustment device is actuated to raise the smooth plate support.

[0034] In particular, if the auxiliary screed plate is completely or partially behind the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the auxiliary screed plate is tilted about the tilting axis to reduce the attack angle of the auxiliary screed plate relative to the roadbed by the tilting device, so that the height adjustment device is actuated to lower the smooth plate support. In particular, if the auxiliary screed plate is completely or partially behind the main screed plate in the paving travel direction, the height adjustment device and the tilting device can be coupled so that the auxiliary screed plate is tilted about the tilting axis to increase the attack angle of the auxiliary screed plate relative to the roadbed by the tilting device, so that the height adjustment device is actuated to raise the smooth plate support.

[0035] Preferably, the area of ​​the auxiliary screed plate that is located at the rear in the paving travel direction is arranged on the tilt axis. For example, the connection between the tilt axis and the auxiliary screed plate can be arranged at the rear 20%, rear 10% or rear 5% of the length of the auxiliary screed plate in the paving travel direction. The further back the auxiliary screed plate is arranged on the tilt axis, the smaller the height change of the rear edge of the auxiliary screed plate is when the tilt angle of the auxiliary screed plate around the tilt axis changes.

[0036] The tilting device may be configured to raise or lower the end of the auxiliary screed plate opposite the tilting axis so as to change the tilt angle of the auxiliary screed plate relative to the plate support. The end of the auxiliary screed plate opposite the tilting axis may be the front end of the auxiliary screed plate relative to the paving travel direction. By raising or lowering the front end of the auxiliary screed plate, the degree of compaction achieved by the auxiliary screed plate may be changed.

[0037] The tilting device may include an actuating connection. The actuating connection may be connected to the auxiliary screed plate. The actuating connection may be configured to automatically rotate the auxiliary screed plate about the tilting axis when the plate support is lowered or raised by the height adjustment device.

[0038] The actuation connection may be connected to a front region of the auxiliary screed smoothing plate relative to the paving travel direction, in particular to the front end.

[0039] The connection position between the auxiliary screed plate and the actuation connection can be spaced apart from the connection position between the auxiliary screed plate and the tilt axis along or against the paving travel direction, in particular by at least 80%, or at least 70%, or at least 50%, or at least 40%, or at least 30% of the length of the auxiliary screed plate along the paving travel direction. Due to the lever effect, the spaced apart connection position can cause the actuation connection to transfer a force to the auxiliary screed plate to change the tilt angle of the auxiliary screed plate about the tilt axis.

[0040] The height adjustment device and the tilting device can be coupled so that the smooth board bracket is lowered or raised by a bracket adjustment length relative to the main ironing board, thereby actuating the tilting device so that the front end of the auxiliary ironing board smooth board is lowered or raised by a smooth board adjustment length relative to the smooth board bracket.

[0041] The height adjustment device and the tilting device can be coupled so that the front end of the auxiliary ironing plate smooth board is lowered or raised by a smooth board adjustment length relative to the smooth board bracket, thereby actuating the height adjustment device so that the smooth board bracket is lowered or raised by a bracket adjustment length relative to the main ironing plate.

[0042] The smooth plate adjustment length may be proportional to the bracket adjustment length.

[0043] The proportionality coefficient between the smoothing plate adjustment length and the bracket adjustment length can be selected so that when the smoothing plate bracket is lowered or raised by the height adjustment device with the said adjustment bracket length, the feed height of the auxiliary screed smoothing plate is adapted to the feed height of the main screed smoothing plate by lowering or raising the front end of the auxiliary screed smoothing plate.

[0044] The proportionality factor between the smoothing plate adjustment length and the bracket adjustment length can be selected so that when the front end of the auxiliary screed smoothing plate is lowered or raised, the height of the rear edge of the auxiliary screed smoothing plate is adapted to the height of the rear edge of the main screed smoothing plate by lowering or raising the smoothing plate bracket.

[0045] The proportionality factor between the support adjustment length and the smoothing plate adjustment length may correspond at least substantially to the ratio between the length of the primary screed smoothing plate in the paving travel direction and the length of the secondary screed smoothing plate in the paving travel direction. For example, if the length of the primary screed smoothing plate in the paving travel direction corresponds to twice the length of the secondary screed smoothing plate in the paving travel direction, the support adjustment length may correspond to twice the smoothing plate adjustment length. Here, the secondary screed smoothing plate may be directly connected to the primary screed smoothing plate (in particular in the paving travel direction).

[0046] The paving screed assembly may include a drive. The drive may be configured to lower or raise the smoothing plate support relative to the main screed. The drive may include, for example, a spindle drive.

[0047] The drive may be coupled to the tilting device. The drive may drive the tilting device. If the drive drives both the height adjustment device and the tilting device, the height adjustment device can be coupled to the tilting device in a particularly cost-effective, efficient and reliable manner.

[0048] The drive may be configured to drive the height adjustment device with a first transmission ratio. The drive may be configured to drive the tilting device with a second transmission ratio. The first transmission ratio may be different from the second transmission ratio. The first transmission ratio and / or the second transmission ratio are adaptable, in particular adjustable. The first transmission ratio and / or the second transmission ratio may be adjusted according to paving conditions or default values.

[0049] The functional coupling of the height adjustment device and the tilt device may comprise a mechanical coupling.Alternatively or additionally, the functional coupling of the height adjustment device and the tilt device may comprise a non-mechanical coupling.

[0050] The functional coupling of the height adjustment device and the tilting device may comprise a coupling which is implemented in terms of control technology. The coupling which is implemented in terms of control technology may, for example, operate the height adjustment device and additionally operate the tilting device based on a user input for controlling the height adjustment device. The coupling which is implemented in terms of control technology may, for example, operate the tilting device and additionally operate the height adjustment device based on a user input for controlling the tilting device. The coupling which is implemented in terms of control technology may, for example, operate the height adjustment device and the tilting device based on a user input, in particular a single user input, in particular in a mutually coordinated manner. It is not necessary to operate the height adjustment device and the tilting device separately, each device having its own user input.

[0051] The functional coupling of the height adjustment device and the tilt device may comprise an electronic coupling or a hydraulic coupling.

[0052] The height adjustment device may be configured to increase the distance between the support frame and the support structure mounted at a fixed height relative to the main screed plate by a first length so as to lower the smoothing plate support relative to the main screed plate and, in particular, at the same time, increase the distance between the support frame and the smoothing plate support by a second length. The height adjustment device may be configured to decrease the distance between the support frame and the support structure by a third length so as to raise the smoothing plate support relative to the main screed plate and, in particular, at the same time, decrease the distance between the support frame and the smoothing plate support by a fourth length. The ratio of the first length to the second length may correspond to the ratio of the third length to the fourth length.

[0053] The tilting device may include an actuating connection. The actuating connection may connect the support frame to the auxiliary screed smoothing plate.

[0054] The actuating connection may be connected to the supporting frame at a first fastening point. The actuating connection may be connected to the auxiliary screed smoothing plate at a second fastening point. The actuating connection may connect the supporting frame to the auxiliary screed smoothing plate such that a distance between the first fastening point and the second fastening point remains constant.

[0055] When the smoothing board support is lowered relative to the main screed plate by the height adjustment device, the second fastening point can be raised relative to the smoothing board support by a distance corresponding to the second length. When the smoothing board support is raised relative to the main screed plate by the height adjustment device, the second fastening point can be lowered by a distance corresponding to the second length.

[0056] The ratio of the first length to the second length may be 1:1.

[0057] The paving screed assembly may include a tilt adjustment device. The tilt adjustment device may allow the tilt angle of the secondary screed smooth plate to be changed about the tilt axis without actuating the height adjustment device. The tilt adjustment device may allow the tilt angle of the secondary screed smooth plate about the tilt axis to be readjusted, for example in order to adjust the angle of attack of the secondary screed smooth plate relative to the roadbed. The tilt adjustment device may allow the offset of the tilt angle of the secondary screed smooth plate about the tilt axis to be adjusted.

[0058] According to another aspect of the utility model, a road paver is provided. The road paver comprises a tractor and the described paving screed assembly. The tractor may comprise a silo for receiving paving material. The silo is preferably located at the front of the tractor along the paving travel direction. The paving screed assembly is preferably attached to the rear of the tractor along the paving travel direction.

[0059] The road paver may comprise a material transport device. The material transport device may be configured to transport paving material from a silo backwards against the paving travel direction and deliver it to the paving screed. The road paver may comprise a transverse distribution device, in particular a distribution screw. The transverse distribution device may be configured to distribute the paving material in a transverse direction in front of the screed. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The present invention will be explained in more detail below based on the embodiments.

[0061] Figure 1 A schematic side view of a road paver having a paving screed assembly according to one embodiment is shown.

[0062] Figure 2 A schematic top view of a paving screed assembly according to one embodiment is shown.

[0063] Figure 3 A schematic perspective view of a paving screed assembly according to one embodiment is shown.

[0064] Figure 4 Shows Figure 3 Schematic diagram of a paving screed assembly of an embodiment of the invention in the region of the auxiliary screed in a viewing direction opposite to the paving travel direction.

[0065] Figure 5 Shows Figure 3 Schematic diagram of a paving screed assembly of an embodiment of FIG. 1 in the region of the auxiliary screed laterally in the viewing direction of the paving screed assembly.

[0066] Figure 6 A schematic diagram is shown for explaining the adjustment process of a paving screed assembly according to one embodiment.

[0067] Figure 7 A schematic view of a paving screed assembly according to an alternative embodiment is shown in a viewing direction opposite to the paving travel direction.

[0068] Figure 8 A schematic view of a paving screed assembly according to another alternative embodiment is shown in a viewing direction opposite to the paving travel direction.

[0069] Fig. 9 A schematic view of a paving screed assembly according to another alternative embodiment is shown in a viewing direction opposite to the paving travel direction.

[0070] Fig.10 A schematic diagram of a paving screed assembly according to another alternative embodiment is shown. DETAILED DESCRIPTION

[0071] Figure 1 A road paver 1 according to one embodiment is shown. The road paver 1 comprises a tractor 3 and a paving screed assembly 7 pulled behind the tractor 3 via a tow bar 5. The paving screed assembly 7 is Figure 1 It is shown schematically in FIG. 1 and can be designed according to all described embodiments.

[0072] The tractor 3 comprises a silo 11 located at the front relative to the paving travel direction 9 for receiving paving material. The paving material is transported backwards by the material transport device of the tractor 3 against the paving travel direction 9 and provided to the paving screed assembly 7. A transverse distribution device 13 in the form of a distribution screw is arranged at the rear of the tractor 3, which distributes the paving material in front of the paving screed assembly 7 along a transverse direction 14 parallel to the horizontal plane and perpendicular to the paving travel direction 9.

[0073] Figure 2 A schematic top view of a paving screed assembly 7 according to one embodiment is shown. The paving screed assembly 7 comprises a main screed 15 and two auxiliary screeds 17. In the embodiment shown, the paving screed assembly 7 is designed as an extended screed assembly. The auxiliary screeds 17 can be moved relative to the main screed 15 in a transverse direction 14 in order to change the total paving width of the paving screed assembly 7. Figure 2 In the figure, the right auxiliary screed plate 17 is shown in a fully retracted state when viewed in the paving travel direction 9, in which state it does not increase the total paving width of the paving screed assembly 7. The left auxiliary screed plate 17 is shown in an extended state when viewed in the paving travel direction 9, in which state it increases the total paving width of the paving screed assembly 7. Intermediate states are also conceivable.

[0074] exist Figure 2 In the embodiment shown, the secondary screed 17 is located in front of the main screed 15 relative to the paving travel direction 9. Alternatively, the secondary screed 17 may be located behind the main screed 15 relative to the paving travel direction 9, or at least partially beside the main screed 15.

[0075] Figure 3 A schematic perspective view of a paving screed assembly 7 according to one embodiment is shown in a viewing direction opposite to the paving travel direction 9. The paving screed assembly 7 is in Figure 2 In the configuration shown in FIG, the auxiliary screed 17 on the left side viewed in the paving direction 9 is extended laterally, and the auxiliary screed 17 on the right side viewed in the paving direction 9 is not extended. Figure 3 A displacement device 19 is shown, by means of which each auxiliary screed plate 17 can be moved integrally in the transverse direction 14 .

[0076] Each secondary screed plate 17 comprises a secondary screed plate smoothing board 21, which is in contact with the paving material to compact and smooth it. Correspondingly, the main screed plate 15 comprises a main screed plate smoothing board 23, which is in contact with the paving material to compact and smooth it. In the embodiment shown, the length of the main screed plate smoothing board 23 in the paving travel direction 9 corresponds to twice the length of the secondary screed plate smoothing board 21 in the paving travel direction 9.

[0077] Figure 4A schematic diagram of the paving screed assembly 7 in the region of the extended auxiliary screed 17 is shown in a viewing direction opposite to the paving travel direction 9. The auxiliary screed 17 comprises a support structure 25, which is arranged at a fixed height relative to the main screed 15. The auxiliary screed 17 also comprises a smoothing plate support 27. The auxiliary screed smoothing plate 21 is attached to the smoothing plate support 27. The smoothing plate support 27 is guided in a height-adjustable manner relative to the support structure 25 and thus relative to the main screed 15 via a guide structure 29. A height adjustment device 31 allows the smoothing plate support 27 to be raised and lowered relative to the support structure 25 and thus relative to the main screed 15. The height adjustment device 31 comprises a drive 33 in the form of an electric motor, which synchronously drives two identical spindle assemblies 35 via a chain. The drive 33 is arranged on a support frame 37. Each spindle 35 is designed as a spindle with a counter thread, which connects the smoothing plate support 27 and the support structure 25 to each other.

[0078] In order to lower the smoothing plate support 27 relative to the main screed plate 15, the drive 33 drives the spindle 35 to increase the distance between the smoothing plate support 27 and the support frame 37 and the distance between the support frame 37 and the support structure 25. If the distance between the support frame 37 and the support structure 25 is increased by a first length, the distance between the support frame 37 and the smoothing plate support 27 is increased by a second length. The ratio between the first length and the second length results from the thread ratio of the corresponding spindle parts, and in the embodiment shown, the thread ratio is 1:1.

[0079] In order to raise the smoothing plate holder 27 relative to the support structure 25 and thus relative to the main screed plate 15, the drive 33 drives the spindle 35 to reduce the distance between the support frame 37 and the support structure 25 and the distance between the support frame 37 and the smoothing plate holder 27. If the distance between the support frame 37 and the support structure 25 is reduced by a third length, the distance between the support frame 37 and the smoothing plate holder 27 is reduced by a fourth length. The ratio between the third length and the fourth length results from the thread ratio of the corresponding spindle parts and in the embodiment shown is 1:1.

[0080] Figure 5 A schematic side view of the paving screed assembly 7 is shown in the viewing direction along the transverse direction 14. Figure 5 As can be seen in the drawing, the paving screed assembly 7 as a whole is tiltable about a general axis extending parallel to the transverse direction 14 by means of a tilt adjustment device 39. The auxiliary screed smoothing board 21 is attached to the smoothing board support 27 so as to be tiltable about a tilting axis 41. The connection between the auxiliary screed smoothing board 21 and the tilting axis 41 is located in the rear region of the auxiliary screed smoothing board 21 relative to the paving travel direction 9.

[0081] from Figure 4As can be seen in FIG. 3 , the support frame 37 and the auxiliary screed smoothing plate 21 are connected to each other by means of two actuating connections 43 of identical design. In particular, the front region of the smoothing plate 21 relative to the paving travel direction 9 is connected to the support frame 37 via the actuating connection 43. The actuating connection 43 represents a tilting device 45, with which the auxiliary screed smoothing plate 21 can be tilted about a tilting axis 41.

[0082] Since the actuation connection 43 is connected to the support frame 37 , the height adjustment device 31 and the tilt device 45 are coupled.

[0083] When the smoothing plate support 27 is lowered by the height adjustment device 31, the support frame 37 is moved downwards by a first length relative to the support structure 25. As a result, the front region of the auxiliary screed smoothing plate 21, which is connected to the support frame 37 via the actuating connection 43, is also moved downwards by a first length relative to the support structure 25. Conversely, the smoothing plate support 21 and the tilting axis 41 as well as the rear end of the auxiliary screed smoothing plate 21 relative to the paving travel direction 9 are moved downwards by the sum of the first length and the second length. This results in the front end of the auxiliary screed smoothing plate 21 being relatively raised by a second length relative to the rear end of the auxiliary screed smoothing plate 21. When the smoothing plate support 27 is lowered, this results in the auxiliary screed smoothing plates 21 being tilted simultaneously about the tilting axis 41 in order to increase the angle of attack between the auxiliary screed smoothing plate 21 and the horizontal surface or the roadbed.

[0084] When the smoothing plate support 27 is raised by the height adjustment device 31, the support frame 37 is moved upwards by the third length relative to the support structure 25. As a result, the front region of the auxiliary screed smoothing plate 21, which is connected to the support frame 37 via the actuating connection 43, is also moved upwards by the third length relative to the support structure 25. Conversely, the smoothing plate support 21 and the tilting axis 41 as well as the rear end of the auxiliary screed smoothing plate 21 relative to the paving travel direction 9 are moved upwards by the sum of the third length and the fourth length. This results in the front end of the auxiliary screed smoothing plate 21 being relatively lowered by the fourth length relative to the rear end of the auxiliary screed smoothing plate 21. When the smoothing plate support 27 is raised, this results in the auxiliary screed smoothing plates 21 being tilted simultaneously about the tilting axis 41 in order to reduce the angle of attack between the auxiliary screed smoothing plate 21 and the horizontal surface or the roadbed.

[0085] Figure 6 A schematic diagram is shown for explaining the application of the utility model in the paving process. Figure 6 In section A of the paving process, the paving process is in a state of equilibrium. The paving material is laid on the roadbed 47, wherein the paved covering has a height level 49 behind the paving screed assembly 7. The height level 49 is defined by the height of the rear edge 51 of the primary screed smoothing board 23 and the height of the rear edge 53 of the secondary screed smoothing board 21. The rear edge 51 of the primary screed smoothing board 23 and the rear edge 53 of the secondary screed smoothing board 21 are at Figure 2 The equilibrium state shown in Part A is at the same height. Figure 6 In section A, the front edge 55 of the primary screed plate 23 and the front edge 57 of the secondary screed plate 21 are also at a common height level, namely height level 59, so that there is at least substantially the same compaction in the area of ​​the primary screed plate 15 and in the area of ​​the secondary screed plate 17.

[0086] Figure 6 Part B of shows the situation after an overall rotation of the paving screed assembly 7 about a general axis extending parallel to the transverse direction 14. This may occur, for example, due to a change in the properties of the paving material or due to a change in the paving thickness. Due to the overall tilting of the paving screed assembly 7, the rear edge 51 of the primary screed smoothing board 23 and the rear edge 53 of the secondary screed smoothing board 21 are no longer at the same height level. In the situation shown, the rear edge 51 of the primary screed smoothing board 23 is at a higher height level 61 than the rear edge 53 of the secondary screed smoothing board 21. This results in a stepped paving cover.

[0087] By actuating the height adjustment device 31 to raise the smoothing plate support 27, the rear edge 53 of the auxiliary screed smoothing plate 21 can be brought to the height level 61 of the rear edge 51 of the primary screed smoothing plate 23 so as to produce a flat surface again. As described above, when the smoothing plate support 27 is raised due to the coupling between the height adjustment device 31 and the tilting device 45, the auxiliary screed smoothing plate 21 is raised as a whole ( Figure 6 The arrow 65 in the B portion of FIG. 4 is formed, and the auxiliary screed plate 21 is tilted around the tilt axis 41, so that the attack angle of the auxiliary screed plate 21 relative to the roadbed 47 is reduced ( Figure 6 The tilting axis 41 is located substantially in the region of the rear edge 53 of the auxiliary screed plate.

[0088] Figure 6 Part C shows the situation after the smoothing plate support 27 has been raised by the height adjustment device 31. The rear edge 53 of the auxiliary screed smoothing plate 21 is raised to the height level 61 of the rear edge 51 of the primary screed smoothing plate 23. At the same time, the auxiliary screed smoothing plate 21 is tilted about the tilting axis 41 so that the front edge 57 of the auxiliary screed smoothing plate 21 is at the same height level 69 as the front edge 55 of the primary screed smoothing plate 23. A flat surface is thus produced again with at least substantially unchanged compaction.

[0089] Figure 7 An alternative embodiment is shown. Figure 7 The embodiment of the invention corresponds substantially to Figures 3 to 5 For the sake of clarity, only the Figures 3 to 5 The differences in the embodiments shown in Figure 7 In the embodiment of the invention, the tilt adjustment device 71 is arranged between the actuating connection 43 and the support frame 37. The tilt adjustment device 71 allows the height of the actuating connection 43 relative to the support frame 37 to be adjusted via a screw 72 and a rocker 74. Thus, the tilt adjustment device 71 allows the tilt angle of the auxiliary screed smoothing plate 21 to be varied about the tilt axis 41, in particular manually, without actuating the height adjustment device 31. By means of the tilt adjustment device 71, for example, the angle of attack of the auxiliary screed smoothing plate 21 can be corrected.

[0090] Figure 8 Another alternative embodiment is shown. Figure 8 The embodiment of the invention corresponds substantially to Figure 7 For the sake of clarity, only the Figure 7 The differences in the embodiments shown. Figure 8 In the embodiment of the invention, a tilt adjustment device 71 is also provided, which allows the tilt angle of the auxiliary screed plate 21 to be changed about the tilt axis 41 (in particular manually) without actuating the height adjustment device 31. Figure 8 In the embodiment of the present invention, this is not done by adjusting the height of the actuating connection 43 relative to the support frame 37, but by tilting the actuating connection 43 from a vertical orientation. The tilt adjustment device 71 comprises a screw 72, which is mounted in a bearing 76 for movement in the transverse direction 14. The actuating connection 43 is rotatably articulated on the screw 72 at an articulation point 78 about an axis extending parallel to the paving travel direction 9. When the screw 72 is moved in the transverse direction 14, the articulation point 78 is moved in the transverse direction 14, whereby the actuating connection 43 is tilted relative to the vertical direction and, due to the constant length of the actuating connection 43, the front area of ​​the auxiliary screed smoothing plate 21 relative to the support frame 37 is raised or lowered.

[0091] Fig. 9 Another alternative embodiment is shown. Fig. 9 The embodiment of the invention corresponds substantially to Figures 3 to 5 For the sake of clarity, only the Figures 3 to 5 The differences in the embodiments shown in Fig. 9In the embodiment of the invention, there is no actuating connection 43 between the support frame 37 and the front region of the auxiliary screed smoothing plate 21. Instead, an actuating connection 81 is provided, which connects the front region of the auxiliary screed smoothing plate 21 to the support structure 25. The actuating connection 81 represents the tilting device 45. The actuating connection 81 comprises a connecting rod assembly 83 having a connecting rod 85 which is hinged on the smoothing plate support 27. If the smoothing plate support 27 is lowered or raised by the height adjustment device 31, when the distance between the support structure 25 and the smoothing plate support 27 changes, the position of the connecting rod assembly 83 changes, so that the front region of the auxiliary screed smoothing plate 21 is raised or lowered. The design of the linkage assembly 83 adapted to the geometry of the paving screed assembly 7 enables the tilting device 45 to be automatically actuated to change the tilt angle of the secondary screed smooth plate 21 about the tilt axis 41 when the smooth plate support 27 is lowered or raised relative to the main screed 15 by the height adjustment device 31, so that the difference between the feed height of the main screed smooth plate 23 and the feed height of the secondary screed smooth plate 21 is partially or completely compensated.

[0092] In the above-mentioned embodiment, the coupling between the height adjustment device 31 and the tilting device 45 is mechanically designed. Fig.10 An alternative embodiment is schematically shown, in which the height adjustment of the smoothing plate support 27 relative to the primary screed plate 15 and the adjustment of the tilt angle of the secondary screed smoothing plate 21 about the tilt axis 41 are coupled non-mechanically.

[0093] exist Fig.10 In the embodiment of the present invention, a tilting device 45 with a drive 80 is provided for changing the tilt angle of the auxiliary screed plate 21 about the tilt axis 41. In addition, a height adjustment device 31 with a drive 82 is provided for lowering or raising the smoothing plate support 27 relative to the main screed plate 15. The drives 80, 82 are driven by a control device 84. For example, the control can be performed electronically or hydraulically.

[0094] Can be operated according to Fig.10 In an embodiment, the control device 84 receives an operator input for lowering or raising the smoothing board support 27 relative to the primary screed plate 15. Based on the operator input, the control device 84 can control the height adjustment device 31. In addition, the control device 84 can automatically control the tilting device 45 to tilt the secondary screed smoothing board 21 based on the same operator input.

[0095] According to another variation, the control device 84 may receive an operator input to adjust the tilt angle of the secondary screed smoothing board 21 about the tilt axis 41. The control device 84 may actuate the tilting device 45 to change the tilt angle based on the operator input. In addition, the control device 84 may actuate the height adjustment device 31 to raise or lower the smoothing board support 27 relative to the primary screed 15 based on the same operator input.

[0096] The relationship between the change in height of the smoothing plate support 27 relative to the main screed 15 and the change in the inclination angle can be predetermined, in particular predetermined in a changeable manner.

Claims

1. A paving screed assembly (7) for a road paver (1), characterized in that The paving screed assembly (7) comprises: a main screed plate (15) having a main screed smoothing plate (23) for contacting the paving material; and An auxiliary screed plate (17) having a smoothing plate support (27) and an auxiliary screed plate smoothing plate (21) for contacting the paving material; wherein the auxiliary screed plate smoothing plate (21) is attached to the smoothing plate bracket (27) so as to be tiltable about a tilting axis (41); The paving screed assembly (7) comprises a height adjustment device (31), wherein the height adjustment device (31) is configured to lower or raise the smoothing plate support (27) relative to the main screed (15); wherein the paving screed assembly (7) comprises a tilting device (45), the tilting device (45) being configured to change the tilting angle of the auxiliary screed smoothing plate (21) around the tilting axis (41); and Wherein, the height adjustment device (31) and the tilting device (45) a) is functionally coupled so that when the smoothing plate support (27) is lowered or raised relative to the primary screed plate (15) by means of the height adjustment device (31), the tilting device (45) is automatically actuated to change the tilt angle of the secondary screed plate (21) about the tilt axis (41), and / or b) is functionally coupled so that when the tilting angle of the secondary screed smoothing plate (21) about the tilting axis (41) is changed by the tilting device (45), the height adjustment device (31) is automatically actuated to lower or raise the smoothing plate support (27) relative to the primary screed (15).

2. The paving screed assembly according to claim 1, wherein: The tilting axis (41) extends transversely to the paving travel direction (9).

3. The paving screed assembly according to claim 1, wherein: The smooth plate support (27) is lowered by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to increase the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47), and / or, the smooth plate support (27) is raised by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to reduce the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47).

4. The paving screed assembly according to claim 2, wherein: The smooth plate support (27) is lowered by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to increase the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47), and / or, the smooth plate support (27) is raised by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to reduce the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47).

5. The paving screed assembly of claim 1, wherein: The smooth plate support (27) is lowered by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to reduce the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47), and / or, the smooth plate support (27) is raised by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to increase the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47).

6. The paving screed assembly of claim 2, wherein: The smooth plate support (27) is lowered by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to reduce the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47), and / or, the smooth plate support (27) is raised by the height adjustment device (31), and the tilting device (45) is actuated to tilt the auxiliary screed smooth plate (21) around the tilting axis (41) to increase the attack angle of the auxiliary screed smooth plate (21) relative to the roadbed (47).

7. The paving screed assembly according to any one of claims 1 to 6, wherein: The rear region of the auxiliary screed smoothing plate (21) in the paving travel direction (9) is arranged on the tilting axis (41).

8. The paving screed assembly according to any one of claims 1 to 6, wherein: The tilting device (45) is configured to raise or lower the end of the auxiliary screed smooth plate (21) opposite to the tilting axis (41) to change the tilting angle of the auxiliary screed smooth plate (21) relative to the smooth plate bracket (27).

9. The paving screed assembly according to any one of claims 1 to 6, wherein: The tilting device (45) comprises an actuating connection (43) connected to the auxiliary screed smoothing plate (21), wherein the actuating connection (43) is configured to automatically rotate the auxiliary screed smoothing plate (21) around the tilting axis (41) when the smoothing plate support (27) is lowered or raised by the height adjustment device (31).

10. The paving screed assembly of claim 9, wherein: The actuating connection (43) is connected to a front region of the auxiliary screed smoothing plate (21) relative to the paving travel direction (9).

11. The paving screed assembly of claim 10, wherein: The actuating connection member (43) is connected to the front end of the auxiliary ironing screed smoothing plate (21).

12. The paving screed assembly according to any one of claims 1 to 6, wherein: The smooth plate bracket (27) is lowered or raised by a bracket adjustment length relative to the main ironing plate (15), thereby actuating the tilting device (45) so that the front end of the auxiliary ironing plate smooth plate (21) is lowered or raised by a smooth plate adjustment length relative to the smooth plate bracket (27), wherein the smooth plate adjustment length is proportional to the bracket adjustment length.

13. The paving screed assembly of claim 12, wherein: The proportionality coefficient between the adjustment length of the bracket and the adjustment length of the smooth plate corresponds at least to the ratio between the length of the main screed smooth plate (23) in the paving direction (9) and the length of the auxiliary screed smooth plate (21) in the paving direction (9).

14. A paving screed assembly according to any one of claims 1 to 6, wherein: The paving screed assembly (7) includes a drive (33) configured to lower or raise the smoothing board support (27) relative to the main screed (15).

15. The paving screed assembly of claim 14, wherein: The driver (33) is coupled to the tilting device (45) and drives the tilting device (45).

16. The paving screed assembly of claim 15, wherein: The driver (33) drives the height adjustment device (31) at a first transmission ratio, and drives the tilting device (45) at a second transmission ratio different from the first transmission ratio.

17. A paving screed assembly according to any one of claims 1 to 6, characterised in that The paving screed assembly further comprises a tilt adjustment device (71) which allows the tilt angle of the auxiliary screed smoothing plate (21) to be changed about the tilt axis (41) without actuating the height adjustment device (31).

18. A road paver (1), characterized in that The road paver (1) comprises: A tractor (3) having a silo (11) located in front of the paving travel direction (9), the silo (11) being used to receive paving material, and A paving screed assembly (7) according to any one of claims 1 to 17, the paving screed assembly (7) being attached to the rear of the tractor (3) in the paving travel direction (9).

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