Road finisher with height-adjustable pre-scraper plate

Abstract

The invention relates to a road paver (1) for producing a paving layer (2) from a paving material (6). The road paver (1) comprises a paving screed (7), a transverse distribution arrangement (9), and a pre-scraper arrangement (24). The paving screed (7) comprises at least one base screed (10). The transverse distribution arrangement (9) is designed to distribute the paving material (6) transversely to a direction of travel (100) of the road paver (1) in front of the paving screed (7). The pre-scraper arrangement (24) is arranged behind the transverse distribution arrangement (9) in the direction of travel (100). The pre-scraper arrangement (24) has a height-adjustable pre-scraper plate (30) arranged in the region of the base screed (10). The invention further relates to a method for operating a road paver (1).

Description

[0001] The present invention relates to a road paver and a method for operating a road paver.

[0002] Road pavers are designed to produce a paving layer from a paving material, such as asphalt, and usually comprise a chassis and working units arranged on the chassis, such as a material hopper, a paving screed, a longitudinal conveyor device and a transverse distributor arrangement.

[0003] The paving screed typically comprises a base screed and extending screed sections adjacent to it. The extending screed sections allow the width of the screed and thus the width of the paving layer, also known as the working width, to be varied and adjusted. Height-adjustable pre-scraper plates can be arranged in front of the extending screed sections to regulate the amount of paving material in front of the extending screed sections. This can reduce the forces acting on the extending screed sections resulting from the resistance of the paving material to displacement. Such an arrangement of pre-scraper plates is known from EP2169117B1. Height-adjustable pre-scraper plates in front of the base screed are not known from the prior art.If the working width of the screed is changed quickly, this can lead to overfilling of the auger channel and overflow of paving material over the front wall of the screed, which can have a negative impact on the paving quality of the paving layer.

[0004] The object of the present invention is to ensure a consistent paving quality of the paving layer, particularly when the working width of the paving screed changes. This object is achieved by a road paver according to claim 1 or a method for operating a road paver according to claim 13.

[0005] According to a first aspect of the invention, a road paver for producing a paving layer from a paving material comprises a paving screed, a transverse distribution assembly, and a pre-scraper assembly. The paving screed has at least one base screed. The transverse distribution assembly is designed to distribute the paving material transversely to a direction of travel of the road paver in front of the paving screed. The pre-scraper assembly is arranged behind the transverse distribution assembly in the direction of travel. The pre-scraper assembly can have a height-adjustable pre-scraper plate. The height-adjustable pre-scraper plate can be arranged in the region of the base screed.

[0006] The direction of travel can correspond to the direction of travel of the road paver during the paving of the paving material and is also referred to as the paving direction of travel. The terms "direction of travel" and "paving direction of travel" are used interchangeably in this application.

[0007] The height-adjustable pre-scraper plate allows the amount of paving material in front of the screed, especially the base screed, to be controlled or limited. This allows the forces acting on the screed, which result in particular from the resistance of the paving material to displacement, to be controlled or limited. This means that less rigidity is required for the screed. Furthermore, a more even paving of the paving material can be ensured. A further advantage is that the paving material can be transported more quickly to the lateral edge areas of the screed when the paving width is increased, particularly by extending the extending screed sections laterally. Material segregation of the paving material can also be reduced by the height-adjustable pre-scraper plate.

[0008] The height-adjustable pre-scraper plate can be arranged in a central region of the road paver. The central region of the road paver can encompass the longitudinal axis, in particular the central longitudinal axis of the road paver. The height-adjustable pre-scraper plate can be arranged in the region of the central longitudinal axis of the road paver. The height-adjustable pre-scraper plate can be arranged in a central region relative to the transverse direction of the road paver. The transverse direction of the road paver can extend orthogonally to the direction of travel of the road paver. The longitudinal axis of the road paver can extend parallel to the direction of travel. The longitudinal axis of the road paver can run through the center of gravity of the road paver.

[0009] The height-adjustable pre-scraper plate can extend substantially orthogonally to the direction of travel or the longitudinal axis of the road paver. The height-adjustable pre-scraper plate can extend substantially transversely to the direction of travel and in the vertical direction. A front side of the height-adjustable pre-scraper plate can be substantially orthogonal to the direction of travel.

[0010] The height-adjustable pre-scraper plate can be vertically moved pneumatically, hydraulically, electrically, and / or mechanically. The pre-scraper assembly can comprise at least one pneumatic cylinder, at least one hydraulic cylinder, at least one electric motor, and / or at least one ratchet or crank, which is / are particularly designed to move the height-adjustable pre-scraper plate. The height-adjustable pre-scraper plate can be vertically moved via a remote control.

[0011] The height-adjustable pre-scraper plate can be designed to be adjustable in its vertical position. The height-adjustable pre-scraper plate can be designed to be adjustable in its vertical position relative to the transverse distributor arrangement. The height-adjustable pre-scraper plate can be designed to be adjustable in its vertical position relative to the paving screed, in particular the base screed.

[0012] The height-adjustable pre-scraper plate can be designed to be vertically movable. The height-adjustable pre-scraper plate can be designed to be vertically movable relative to the paving screed, in particular the base screed. The height-adjustable pre-scraper plate can be designed to be vertically movable relative to the transverse distributor arrangement.

[0013] The height-adjustable pre-scraper plate allows the vertical distance between the pre-scraper assembly and the subsoil to be varied or adjusted. A small vertical distance between the pre-scraper assembly and the subsoil minimizes the load on the screed, especially the base screed. A small vertical distance between the pre-scraper assembly and the subsoil allows for better transport of the paving material to the edge areas of the screed, especially to the extending screed sections.

[0014] The height-adjustable pre-scraper plate can be designed to be continuously movable. The vertical position of the height-adjustable pre-scraper plate can be continuously adjustable.

[0015] The term height-adjustable is to be understood, in particular in the present application, to mean that the vertical position is adjustable.

[0016] The height-adjustable pre-scraper plate can be moved by at least 50 millimeters, preferably at least 100 millimeters, preferably at least 200 millimeters, in height relative to the transverse distributor arrangement. The height-adjustable pre-scraper plate can be moved by at least 50 millimeters, preferably at least 100 millimeters, preferably at least 200 millimeters, in height relative to the paving screed, in particular to the base screed. The height-adjustable pre-scraper plate can be moved by at least 50 millimeters, preferably at least 100 millimeters, preferably at least 200 millimeters, in height relative to the subsoil.

[0017] The pre-scraper arrangement can have a width between 110 centimeters and 320 centimeters, preferably between 110 centimeters and 130 centimeters, preferably between 170 centimeters and 190 centimeters, preferably between 230 centimeters and 260 centimeters, preferably between 290 centimeters and 320 centimeters. The width is defined in particular as the extension transverse to the direction of travel. The height-adjustable pre-scraper plate can have a width between 55 centimeters and 160 centimeters, preferably between 55 centimeters and 65 centimeters, preferably between 85 centimeters and 95 centimeters, preferably between 115 centimeters and 130 centimeters, preferably between 145 centimeters and 160 centimeters.

[0018] The width of the height-adjustable pre-scraper plate can correspond to the width of the paving screed. The width of the height-adjustable pre-scraper plate can correspond to the width of the base screed. The width of the height-adjustable pre-scraper plate can correspond to the combined width of the base screed and the extending sections. The width of the height-adjustable pre-scraper plate can correspond to the width of a cross-distribution channel or tunnel of the road paver.

[0019] The road paver may have a longitudinal conveyor device. The longitudinal conveyor device may be arranged in front of the paving screed in the direction of travel. The transverse distributor assembly may be arranged in front of the paving screed in the direction of travel. The transverse distributor assembly may be arranged downstream of the longitudinal conveyor device in the direction of travel. The road paver may further have a material hopper for receiving the paving material. The material hopper may be arranged upstream of the longitudinal conveyor device in the direction of travel.

[0020] The road paver may have a chassis. The chassis may be arranged to the side of the longitudinal conveyor device. The chassis may comprise a left chassis and a right chassis. Left and right refer to the direction of travel of the road paver. The left chassis may be arranged to the left of the longitudinal conveyor device. The right chassis may be arranged to the right of the longitudinal conveyor device. The chassis, in particular the left and right chassis, may be crawler chassis. The chassis, in particular the left and right chassis, may comprise wheels.

[0021] The height-adjustable pre-scraper plate can extend transversely to the direction of travel, particularly to the left and right, beyond the longitudinal conveyor device. The height-adjustable pre-scraper plate can extend transversely to the direction of travel into the undercarriage. The height-adjustable pre-scraper plate can be arranged behind the undercarriage in the direction of travel. The height-adjustable pre-scraper plate can extend transversely to the direction of travel from a left lateral end to a right lateral end of the undercarriage. The height-adjustable pre-scraper plate can extend transversely to the direction of travel from an outer side of the left undercarriage to an outer side of the right undercarriage.

[0022] The height-adjustable pre-scraper plate can extend transversely to the direction of travel from a left lateral end to a right lateral end of the base screed. The height-adjustable pre-scraper plate can extend transversely to the direction of travel, particularly to the left and right, beyond the base screed.

[0023] The transverse distributor assembly may comprise at least one auger. The transverse distributor assembly may comprise a left auger and a right auger. The left auger and the right auger may each extend substantially transversely to the direction of travel. The left auger and the right auger may be mounted on a suspension in the form of a screw suspension or a center bearing block. The transverse distributor assembly may have additional augers.

[0024] The height-adjustable pre-scraper plate can be moved vertically during operation of the road paver. The height-adjustable pre-scraper plate can be moved vertically during paving operations of the road paver. The vertical position of the pre-scraper plate can be adjusted during operation of the road paver.

[0025] The vertical position of the height-adjustable pre-scraper plate can be adjusted during operation of the road paver, in particular relative to the cross-distributor assembly and / or the paving screed. In particular, the pre-scraper assembly can be designed such that the height-adjustable pre-scraper plate can be lowered and raised during operation of the road paver, in particular relative to the cross-distributor assembly and / or the paving screed.

[0026] The height-adjustable pre-scraper plate can be at least indirectly attached to a suspension of the transverse distribution arrangement. The height-adjustable pre-scraper plate can be attached to the suspension of the transverse distribution arrangement via an intermediate piece, for example a support structure. The height-adjustable pre-scraper plate can be attached directly to the suspension of the transverse distribution arrangement. The suspension of the transverse distribution arrangement and the height-adjustable pre-scraper plate can be attached to the same component. The suspension of the transverse distribution arrangement can be attached to a transverse distribution bracket. The height-adjustable pre-scraper plate can also be attached to the transverse distribution bracket.

[0027] The height-adjustable pre-scraper plate can be attached to the screed, in particular the base screed, at least indirectly. The height-adjustable pre-scraper plate can be attached to the screed, in particular the base screed, via an intermediate piece, for example a support structure. The height-adjustable pre-scraper plate can be attached directly to the screed, in particular the base screed.

[0028] The transverse distribution assembly can be vertically adjustable, particularly relative to the paving screed. The transverse distribution assembly can be vertically adjustable relative to the subgrade. The transverse distribution bracket or the suspension of the transverse distribution assembly can be attached to the road paver's chassis via cylinders. The vertical position of the transverse distribution bracket, the suspension of the transverse distribution assembly, the height-adjustable pre-scraper plate, and / or the transverse distribution assembly can be adjustable via the cylinders. The cylinders can be pneumatic, hydraulic, or electric.

[0029] The height-adjustable pre-scraper plate can be vertically movable relative to the transverse distribution arrangement. The vertical position of the pre-scraper plate can be adjustable relative to the transverse distribution arrangement. An adjustment arrangement arranged between the height-adjustable pre-scraper plate and the transverse distribution arrangement can be configured to move the height-adjustable pre-scraper plate relative to the transverse distribution arrangement. The adjustment arrangement can comprise at least one pneumatic, hydraulic, or electric cylinder. The adjustment arrangement can comprise an electric motor. The adjustment arrangement can comprise a ratchet or crank.

[0030] The height-adjustable pre-scraper plate can be vertically movable relative to the screed, in particular the base screed. The vertical position of the pre-scraper plate can be adjustable relative to the screed, in particular the base screed. An adjustment arrangement arranged between the height-adjustable pre-scraper plate and the screed, in particular the base screed, can be designed to move the height-adjustable pre-scraper plate relative to the screed, in particular the base screed. The adjustment arrangement can have at least one pneumatic, hydraulic, or electric cylinder. The adjustment arrangement can have an electric motor. The adjustment arrangement can have a ratchet or crank.

[0031] The pre-scraper assembly can be arranged substantially, particularly in the direction of travel, between the transverse distributor assembly and the paving screed. The height-adjustable pre-scraper plate can be arranged substantially, particularly in the direction of travel, between the transverse distributor assembly and the base screed.

[0032] The term "essentially" is to be interpreted in particular to mean that areas of the individual components may also overlap. The center of gravity of the pre-scraper assembly can be arranged, particularly in the direction of travel, between the center of gravity of the transverse distribution assembly and the center of gravity of the paving screed, particularly the center of gravity of the base screed. The center of gravity of the height-adjustable pre-scraper plate can be arranged, particularly in the direction of travel, between the center of gravity of the transverse distribution assembly and the center of gravity of the base screed.

[0033] The paving material can be transported from the longitudinal conveyor to the transverse distribution assembly opposite to the direction of travel of the road paver. The paving material can be transported underneath the pre-scraper assembly, in particular the pre-scraper plate, to the paving screed, in particular the base screed.

[0034] In addition to the base screed, the paving screed may have extending screed sections. The extending screed sections may be arranged transversely to the side of the base screed, particularly on both sides of the base screed. The extending screed sections may be offset from the base screed in the direction of travel.

[0035] The extending screed sections or the front edges of the extending screed sections can be positioned in front of the base screed or the front edge of the base screed in the direction of travel. The paving screed can be a front-mount screed, also known as a front screed.

[0036] The extending screed sections or the front edges of the extending screed sections can be positioned behind the base screed or the front edge of the base screed in the direction of travel. The paving screed can be a rearmount screed, also known as a rear-mount screed.

[0037] The road paver may have a measuring system. The measuring system may be arranged in the direction of travel between the transverse distributor assembly and the paving screed, in particular the base screed.

[0038] The measuring system can be designed to measure the amount of paving material in front of the screed, in particular the base screed. The amount of paving material is, in particular, the amount of paving material directly in front of the screed or the base screed.

[0039] The measuring system can be designed to measure the height of the paving material between the transverse distributor arrangement and the screed. The height of the paving material is, in particular, the vertical distance between the upper edge of the paving material and the subsoil. The measuring system can be designed to detect or measure the upper edge of the paving material between the transverse distributor arrangement and the screed, in particular the base screed.

[0040] The measuring system can be designed to carry out the measurements continuously and / or at predefined time intervals.

[0041] The measuring system can comprise at least one sensor. The at least one sensor can be arranged in the direction of travel between the transverse distributor assembly and the screed, in particular the base screed. The at least one sensor can be arranged between the pre-scraper assembly and the screed. The at least one sensor can be arranged between the height-adjustable pre-scraper plate and the base screed.

[0042] The at least one sensor can be an optical sensor. The at least one sensor can be a mechanical sensor. The at least one sensor can be a rotary encoder, in particular with a mechanical probe arm. The at least one sensor can be an electro-optical sensor. The at least one sensor can be a laser distance sensor. The at least one sensor can be an infrared rangefinder. The at least one sensor can be an ultrasonic sensor. The at least one sensor can be one or more cameras.

[0043] The road paver can have multiple sensors. The sensors can be arranged transversely to the direction of travel. A first sensor can be arranged in front of the base screed. A second sensor can be arranged in front of a first extending screed part, which is arranged, in particular, to the left of the base screed in the transverse direction. A third sensor can be arranged in front of a second extending screed part, which is arranged, in particular, to the right of the base screed in the transverse direction.

[0044] The road paver may additionally have one or more auger sensors. The auger sensor(s) may be configured to determine the vertical position of the transverse distributor assembly, in particular the vertical distance between the ground and a transverse rotation axis of the transverse distributor assembly.

[0045] The road paver may additionally have one or more screed sensors. The screed sensor(s) may be configured to determine the vertical position of the screed, in particular the vertical distance between the subsoil and a lower edge of the base screed.

[0046] The height-adjustable pre-scraper plate, in particular the left and second height-adjustable pre-scraper plate, can have a projection on the lower edge pointing in the direction of travel. The projection can have a triangular cross-section, in particular in the shape of a right-angled triangle, when viewed in the transverse direction. The surface of the pre-scraper plate formed by the hypotenuse of the triangle can point in the direction of travel.

[0047] The road paver may include a control unit. The control unit may be configured to adjust the height of the height-adjustable pre-scraper plate, particularly during operation or during a paving run of the road paver.

[0048] The control unit can be configured to receive data from the measuring system. The control unit can be configured to receive data from the measuring system wirelessly. The data can be transmitted between the control unit and the measuring system via Bluetooth, Wi-Fi, or similar means. The data can be transmitted between the control unit and the measuring system via a cable.

[0049] The control unit can be configured, particularly in combination with the measuring system, to regulate or control the advance of the paving material in front of the screed. The control unit can be configured, particularly in combination with the measuring system, to keep the advance of the paving material in front of the screed as constant as possible, particularly in accordance with a predefined target value.

[0050] The control unit can be configured, particularly in combination with the measuring system, to regulate or control the height of the paving material between the pre-scraper arrangement and the paving screed, in particular the base screed. The control unit can be configured, particularly in combination with the measuring system, to keep the height of the paving material between the pre-scraper arrangement and the paving screed, in particular the base screed, as constant as possible, in particular according to a predefined target value.

[0051] The control unit can be configured to move the height-adjustable pre-scraper plate based on the screed height, particularly in combination with measured values ​​from the measuring system. The screed height is, in particular, the vertical distance of the screed, in particular the lower edge of the base screed, from the subgrade. The control unit can be configured to adjust the vertical position of the height-adjustable pre-scraper plate based on the screed height, particularly in combination with measured values ​​from the measuring system.

[0052] The advance of the paving material in front of the screed, or the height of the paving material between the pre-scraper assembly and the screed, can be influenced by adjusting the vertical position of the pre-scraper plate. Lowering the pre-scraper plate can result in a lower height or quantity of paving material directly in front of the screed, especially the base screed. Raising the pre-scraper plate can result in a higher height or quantity of paving material directly in front of the screed, especially the base screed.

[0053] The pre-scraper plate can be rotatable about a rotation axis during operation of the road paver. The rotation axis runs, in particular, parallel to the direction of travel. The rotation axis can be positioned centrally with respect to the transverse direction of the road paver. The height-adjustable pre-scraper plate can be rotatable about the rotation axis during operation or a paving run of the road paver.

[0054] When cornering or on slopes in the cross-section of the paving layer, different amounts of paving material are placed on the left and right sides of the screed. This requires, in particular, different heights and quantities of paving material in front of the screed (viewed in the transverse direction). This can be accommodated by rotating the height-adjustable pre-scraper plate.

[0055] The control unit can be configured to rotate the height-adjustable pre-scraper plate around the rotation axis, in particular during operation or a paving run of the road paver.

[0056] The height-adjustable pre-scraper plate can be rotated by an angle between minus 10 degrees and plus 10 degrees, preferably minus 3 degrees and plus 3 degrees. The control unit can be configured to rotate the height-adjustable pre-scraper plate by an angle between minus 10 degrees and plus 10 degrees, preferably minus 3 degrees and plus 3 degrees. The angles are to be understood in particular as a deviation from the horizontal. In particular, at an angle of 0 degrees, the lower edge of the height-adjustable pre-scraper plate is aligned horizontally.

[0057] The control unit can be configured to adjust or control the rotation of the height-adjustable pre-scraper plate based on the current installation situation, such as cornering and / or the transverse slope. The control unit can be designed to adjust or control the rotation of the height-adjustable pre-scraper plate based on the current installation situation in combination with one or more measured values ​​from the measuring system.

[0058] The height-adjustable pre-scraper plate can be a first height-adjustable pre-scraper plate. The pre-scraper arrangement can additionally have a second height-adjustable pre-scraper plate. The second height-adjustable pre-scraper plate can be arranged transversely to the direction of travel next to the first height-adjustable pre-scraper plate. The second height-adjustable pre-scraper plate can be vertically adjustable relative to the first height-adjustable pre-scraper plate.

[0059] The arrangement of two or more height-adjustable pre-scraper plates can provide an alternative solution for taking curves or transverse inclinations into account. However, the arrangement of two or more height-adjustable pre-scraper plates can also be combined with rotatable height-adjustable pre-scraper plates. The two or more height-adjustable pre-scraper plates can be rotatable on the same or different axes of rotation.

[0060] The first and second height-adjustable pre-scraper plates can be arranged at the same position as the second height-adjustable pre-scraper plate, viewed in the direction of travel. The first height-adjustable pre-scraper plate and the second height-adjustable pre-scraper plate can be aligned with each other, in particular with respect to the direction of travel.

[0061] The control unit can be configured to adjust the height of the first height-adjustable pre-scraper plate, in particular during operation or a paving run of the road paver. The control unit can be configured to adjust the height of the second height-adjustable pre-scraper plate, in particular during operation or a paving run of the road paver.

[0062] The first and second height-adjustable pre-scraper plates can be vertically movable relative to one another between 0 millimeters and 150 millimeters, preferably between 0 millimeters and 50 millimeters, preferably between 0 millimeters and 100 millimeters. The control unit can be configured to move the first and second height-adjustable pre-scraper plates vertically relative to one another between 0 millimeters and 150 millimeters, preferably between 0 millimeters and 100 millimeters, preferably between 0 millimeters and 50 millimeters.

[0063] In a first position, the first height-adjustable pre-scraper plate can be arranged higher than the second height-adjustable pre-scraper plate. In a second position, the first height-adjustable pre-scraper plate can be arranged at the same height as the second height-adjustable pre-scraper plate. In a third position, the first height-adjustable pre-scraper plate can be arranged lower than the second height-adjustable pre-scraper plate.

[0064] The height-adjustable pre-scraper plate, in particular the first and second height-adjustable pre-scraper plates, can be designed to be continuously movable. The vertical position of the height-adjustable pre-scraper plate, in particular the first and second height-adjustable pre-scraper plates, can be continuously adjustable.

[0065] The control unit can be configured to continuously adjust the height of the height-adjustable pre-scraper plate. The control unit can be configured to continuously adjust the height of the first and second height-adjustable pre-scraper plates. The control unit can be configured to continuously rotate the height-adjustable pre-scraper plate.

[0066] The first and second height-adjustable pre-scraper plates can each be rotatable by an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The control unit can be configured to rotate the height-adjustable pre-scraper plate by an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The control unit can be configured to rotate the first height-adjustable pre-scraper plate by an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees, in particular independently of the second height-adjustable pre-scraper plate. The control unit can be configured to rotate the second height-adjustable pre-scraper plate by an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees, in particular independently of the first height-adjustable pre-scraper plate.The control unit may be configured to rotate the first height-adjustable pre-scraper plate together with the second height-adjustable pre-scraper plate.

[0067] The angles are to be understood as deviations from the horizontal. In particular, at an angle of 0 degrees, the lower edge of the height-adjustable pre-scraper plate is aligned horizontally.

[0068] Alternatively or in addition to the height adjustment, the first pre-scraper plate and the second pre-scraper plate can be designed to be rotatable about axes running parallel to the direction of travel. The first pre-scraper plate can be designed to be rotatable about a first angle about a first axis parallel to the direction of travel. The second pre-scraper plate can be designed to be rotatable about a second angle about a second axis parallel to the direction of travel. The control unit can be designed to rotate the first pre-scraper plate and the second pre-scraper plate by the same angle. The control unit can be designed to rotate the first pre-scraper plate and the second pre-scraper plate by different angles, in particular in different directions.For example, the control unit may be configured to rotate the first pre-scraper plate by a positive angle and the second pre-scraper plate by a negative angle and vice versa.

[0069] The control unit can be configured to adjust or control the rotation of the height-adjustable pre-scraper plate based on the current installation situation, such as cornering and / or the transverse slope. The control unit can be designed to adjust or control the rotation of the height-adjustable pre-scraper plate based on the current installation situation in combination with one or more measured values ​​from the measuring system.

[0070] The pre-scraper arrangement can additionally have a further plate. The further plate can be adjustable, in particular height-adjustable. The further plate can be adjustable in or against the direction of travel or horizontally. The further plate can be arranged in the direction of travel between the height-adjustable pre-scraper plate and the transverse distributor arrangement, in particular the center bearing block of the transverse distributor arrangement. The further plate can have a positive effect on the demixing of the paving material in the area of ​​the center bearing block. The further plate can reduce the space behind the center bearing block, in particular by adjusting it in the direction of travel or horizontally. By adjusting the further plate, the horizontal distance of the further plate to the center bearing block can be adjusted. The additional plate can prevent or accelerate the cooling of the paving material in the area behind the center bearing block.be reduced. The additional sheet metal may have elongated holes. The elongated holes may extend in the direction of travel or horizontally.

[0071] According to a second aspect of the invention, a method for operating a road paver comprises conveying paving material in front of a paving screed of the road paver opposite a direction of travel of the road paver and distributing the paving material in front of the paving screed transversely to the direction of travel of the road paver by means of a transverse distribution arrangement. The road paver has a pre-scraper plate which is arranged behind the transverse distribution arrangement in the direction of travel and is arranged transversely to the direction of travel in the region of a base screed of the paving screed. The pre-scraper plate can be moved vertically and / or rotated during operation of the road paver, in particular during a paving run of the road paver. The road paver can be designed according to the first aspect of the invention.

[0072] The pre-scraper plate can be designed like the height-adjustable pre-scraper plate described in the first aspect of the invention. The road paver can have a pre-scraper assembly that, in particular, includes the pre-scraper plate. The pre-scraper assembly can be designed like the pre-scraper assembly described in the first aspect of the invention.

[0073] The height of the pre-scraper plate can be adjusted automatically by a control unit. The height of the pre-scraper plate can be adjusted by operator input. The control unit can be designed like the control unit described in the first aspect of the invention.

[0074] The method may further comprise measuring the height of the paving material in a region between the transverse distributor assembly and the screed, in particular in a region between the pre-scraper plate and the screed. The method may further comprise adjusting the height or vertical position of the pre-scraper plate based on the measured height of the paving material.

[0075] The height or vertical position of the pre-scraper plate can be adjusted based on the current working width of the screed or a change in the working width of the screed.

[0076] The height of the paving material can be measured using a measuring system. The measuring system can be designed like the measuring system described in the first aspect of the invention.

[0077] Alternatively or in addition to adjusting the height of the pre-scraper plate, the method can include rotating the pre-scraper plate around an axis parallel to the direction of travel. The pre-scraper plate can rotate based on the measured height of the paving material. The pre-scraper plate can rotate based on the current working width of the screed or a change in the working width of the screed.

[0078] The method may include adjusting the height or vertical position of a first pre-scraper plate and a second pre-scraper plate. The method may include adjusting a rotation of a first pre-scraper plate and a second pre-scraper plate.

[0079] The road paver according to the first aspect of the invention can be used with method steps of the method according to the second aspect of the invention. The method according to the second aspect of the invention can be carried out with a road paver according to the first aspect of the invention.

[0080] As used in the description of the various embodiments described and the appended claims, the singular forms are to be construed as including the plural forms and vice versa, unless the context clearly indicates otherwise.

[0081] The terms "first," "second," "third," and "fourth" are merely designations for a specific element or component and do not necessarily indicate a particular order or arrangement of the components or elements mentioned. For example, the presence of a fourth element does not necessarily imply the presence of a first, second, or third element, and vice versa.

[0082] Advantageous embodiments of the invention are explained in more detail below with reference to the attached figures. Fig. 1 shows a side view of a road paver according to the invention. Fig. 2 shows a perspective view of a road paver according to the invention. Fig. 3 shows a plan view of the longitudinal conveyor device, the transverse distributor arrangement and the paving screed of a road paver according to the invention. Fig. 4 shows a plan view of an alternative embodiment of the invention of the Fig. 3 shown paving screed. Fig. 5 shows a side sectional view of a section of a road paver according to the invention. Fig. 6 shows a perspective view of the pre-scraper arrangement, the transverse distributor arrangement and the deflector plate arrangement of a road paver according to the invention. Fig. 7 shows a perspective view of an alternative embodiment of the invention of the Fig. 6 shown pre-scraper arrangement. Fig. 8 shows a perspective view of another alternative embodiment of the invention of the Fig. 6 shown pre-scraper arrangement. Fig. 9 shows a side sectional view of a section of a road paver according to the invention in a first position. Fig. 10 shows a side sectional view of a section of a road paver according to the invention in a second position. Fig. 11 shows a side sectional view of a section of a road paver according to the invention in a third position. Fig. 12 shows a perspective view from the side of a section of a road paver according to the invention. Fig. 13 shows a perspective view from below of the Fig. 12 shown section of a road paver according to the invention.

[0083] The Fig. 1 und 2 show a side view and a perspective top view of a road paver 1 according to the invention for producing a paving layer 2 on a subsurface 3. The road paver 1 has a material hopper 4 at the front in the paving direction of travel 100, from which paving material 6 held therein is transported to a paving screed 7 of the road paver 1 by means of a longitudinal conveyor device 5, counter to the paving direction of travel 100 of the road paver 1. The longitudinal conveyor device 5 is arranged within a chassis 8 of the road paver 1 and transports the paving material 6 initially to a transverse distributor arrangement 9 arranged in front of the paving screed 7 in the paving direction of travel 100. The transverse distributor arrangement 9 is designed to distribute the paving material 6 in front of the paving screed 7 along a transverse direction 200 transverse to the paving direction of travel 100.

[0084] The extension of the paved layer 2 in the transverse direction 200 is referred to as the working width 210 or paving width 210. The paving screed 7 has a screed base body 10 and laterally extendable extending screed parts 11. By extending the extending screed parts 11 laterally, the working width 210 of the paving layer 2 can be varied and adjusted.

[0085] The road paver 1 further comprises a control unit 37. The control unit 37 can be operated by user input or automatically. The control unit 37 is designed to adjust the vertical position of a height-adjustable pre-scraper plate 30. The control unit 37 is configured to move the height of the height-adjustable pre-scraper plate 30.

[0086] Fig. 3 shows a schematic representation of a top view of the paving screed 7 and the longitudinal conveyor device 5 of the road paver 1 according to the invention. The longitudinal conveyor device 5 has a conveyor belt in the form of a scraper belt 12. The scraper belt 12 comprises a left scraper belt section 13 and a right scraper belt section 14. The designations left and right are to be understood as looking in the paving direction of travel 100.

[0087] The paving material 6 dropped by the scraper belt 12 in front of the screed base body 10 of the paving screed 7 is distributed by the transverse distributor arrangement 9 along a front side 14 of the screed base body 10, as shown by arrows 220.

[0088] A rear wall 15 of the chassis 8 of the road paver 1 forms together with the front side 14 of the screed base body 10 a transverse distribution channel 16, also referred to as auger chamber, for the transverse distribution arrangement 9.

[0089] The extending screed parts 11 of the paving screed 7 can be extended laterally in the transverse direction 200 relative to the base screed 10, whereby the paving screed 7 can be widened and the working width 210 can be varied. The transverse distribution channel 16 can be further extended laterally in accordance with a widening of the paving screed 7.

[0090] From the scraper belt 12 of the longitudinal conveyor device 5, the paving material 6 is transferred to the transverse distribution arrangement 9, which is positioned in front of the paving screed 7. The transverse distribution arrangement 9 is designed to distribute the paving material 6 in front of the paving screed 7 in the transverse direction 200, transverse to the paving travel direction 100, within the transverse distribution channel 16.

[0091] The transverse distributor assembly 9 is attached to the rear end of the chassis 8 of the road paver 1. The transverse distributor assembly 9 comprises a left auger 17 and a right auger 18. The left auger 17 and the right auger 18 are mounted on a suspension 19 in the form of a screw suspension 19. The screw suspension 19 can also be referred to as a center bearing block 19.

[0092] Located in the housing formed by the screw suspension 19 is a screw drive (not shown) for driving the two distribution screws 17, 18. The transverse distribution arrangement 9 comprises a shaft 20. This can be two individual shafts 20 (left shaft 21, right shaft 22) or a common shaft 20 for the two distribution screws 17, 18. The left distribution screw 17 is detachably coupled to the left shaft 21. The right distribution screw 18 is detachably coupled to the right shaft 22. The outer end of each shaft 21, 22, i.e. the end facing away from the screw suspension 19, is mounted in a screw bearing 23.

[0093] The pre-scraper arrangement 24 according to the invention is in Fig. 3 not shown. The position of the pre-wiper arrangement 24 is indicated by the reference numeral 24.

[0094] The front edge 14 of the base pile 10 is in the Fig. 3 In the embodiment shown, it is arranged in front of the front edges 25 of the extending screed parts 11 in the direction of travel 100. This form of paving screed 7 is referred to as a rearmount screed or rear screed.

[0095] Fig. 4 shows a plan view of an alternative embodiment of a paving screed 7 of a road finisher 1 according to the invention. In comparison to the embodiment in Fig. 3 The front edges 25 of the extending screed parts 11 are arranged in front of the front edge 14 of the base screed 10 in the direction of travel 100. This form of the paving screed 7 is referred to as a front-mount screed or front screed.

[0096] The extendable plank parts 11 are located in the Fig. 4 shown in the extended position. The cross distributor arrangement 9 and the pre-scraper arrangement 24 according to the invention are in Fig. 4 not shown. The position of the transverse distribution arrangement 9 is indicated in the transverse distribution channel 16.

[0097] The road paver 1 can have a deflector plate assembly 26, which is arranged in the direction of travel 100 between the longitudinal conveyor device 5 and the transverse distributor assembly 9. The deflector plate assembly 26 can have a height-adjustable deflector plate.

[0098] Fig. 5 shows a side sectional view of a section of a road paver 1 according to the invention. The screw suspension 19 of the transverse distributor arrangement 9 is attached to the chassis 8 via a cylinder 27 in a height-adjustable manner. The paving material height 28 of the paving material 6 is in Fig. 5 shown in dashed lines.

[0099] The pre-scraper assembly 24 is attached to the chassis 8 or to the auger suspension 19 via a bracket 29. Alternatively, the bracket 29 can be attached to the paving screed 7. The pre-scraper assembly 24 has a pre-scraper plate 30. The pre-scraper plate 30 is designed to be movable up and down relative to the bracket 29 in the vertical direction 300.

[0100] Fig. 6 shows a perspective view of the pre-scraper arrangement 24, the transverse distributor arrangement 9 and the deflector plate arrangement 26 of a road finisher 1 according to the invention. The deflector plate arrangement 26 is optionally present.

[0101] The pre-scraper assembly 24 has a support structure 31. The support structure 31 is mounted on the screw suspension 19. The pre-scraper plate 30 is mounted on the support structure 31 via an adjusting device 32 in the form of a hydraulic or pneumatic cylinder. The vertical position of the pre-scraper plate 30 can be adjusted by the adjusting device 32.

[0102] Fig. 7 und 8 show perspective views of alternative embodiments of the Fig. 6 shown pre-scraper arrangement 24.

[0103] The Fig. 7 The pre-scraper arrangement 24 shown has a pre-scraper plate 30 that is designed to be rotatable by an angle of 40° about an axis parallel to the direction of travel 100. The rotation of the pre-scraper plate 30 can be achieved by the adjusting device 32. The adjusting device 32 has, in particular, a left actuator 33 and a right actuator 34, which can be controlled separately from one another, in particular by the control unit 37.

[0104] The Fig. 8 The pre-scraper assembly 24 shown has a first height-adjustable pre-scraper plate 35 in the form of a left pre-scraper plate 35 and a second height-adjustable pre-scraper plate 36 in the form of a right pre-scraper plate 36. The left pre-scraper plate 35 and the right pre-scraper plate 36 can be moved vertically independently of one another. This allows a vertical offset 310 to be realized between the left pre-scraper plate 35 and the right pre-scraper plate 36. The adjusting device 32 has in particular a left actuator 33 and a right actuator 34, which can be controlled separately from one another, in particular by the control unit 37. By separately controlling the left actuator 33 and the right actuator 34, the vertical offset 310 between the left pre-scraper plate 35 and the right pre-scraper plate 36 is realized.

[0105] Alternatively or in addition to the height adjustment, the left pre-scraper plate 35 and the right pre-scraper plate 36 can be designed to be rotatable about axes running parallel to the direction of travel 100. The left pre-scraper plate 35 can be designed to be rotatable about a first angle 410 about a first axis parallel to the direction of travel 100. The right pre-scraper plate 36 can be designed to be rotatable about a second angle 420 about a second axis parallel to the direction of travel 100. The rotation of the left pre-scraper plate 35 can be realized by the left actuator 33. The rotation of the right pre-scraper plate 36 can be realized by the right actuator 34. The adjusting device 32 can have further actuators, in particular a second left actuator and a second right actuator, which are designed to rotate the left and right pre-scraper plates, respectively.The control unit can be configured to rotate the left pre-scraper plate 35 and the right pre-scraper plate 36 by the same angle. The control unit can be configured to rotate the left pre-scraper plate 35 and the right pre-scraper plate 36 by different angles, in particular in different directions.

[0106] The Fig. 9 bis 11 show side sectional views of a section of a road paver 1 according to the invention. The road paver 1 has a measuring system (no reference number). The measuring system comprises a sensor 38. The sensor 38 is arranged between the transverse distributor arrangement 9 and the paving screed 7, in particular between the height-adjustable pre-scraper plate 30 and the base screed 10. The sensor 38 is directed downwards and configured to measure the vertical distance between the sensor 38 and an upper edge of the paving material 6. The sensor 38 and / or the control unit 37 can determine the paving material height 28 below the sensor 38 using the measured distance and the position of the sensor 38. The road paver 1 can also have a plurality of sensors 38.

[0107] The auger height 320 of the auger 17 is defined as the vertical distance from the auger rotation axis 39 running in the transverse direction 200 and the subsoil 3. The paving material height 28 between the height-adjustable pre-scraper plate 30 and the base screed 10 is represented by the reference numeral 330 and is defined as the vertical distance between the upper edge of the paving material 6 and the subsoil 3. The paving screed height 340 is defined as the vertical distance between the paving screed 7, in particular the base screed 10, and the subsoil 3.

[0108] In Fig. 9 the transverse distributor arrangement 9 is arranged in a first position at a first auger height 320 above the subsoil 3. The paving screed 7 is arranged in a first position at a first screed height 340 above the subsoil 3. The required amount of paving material 6 in front of the screed 7 or a target value for the paving material height 330 in front of the screed 7 can be determined by the control unit 37, for example based on the auger height 320 and the screed height 340. Alternatively, the target value for the paving material height 330 in front of the screed 7 can be determined by user input. The control unit 37 then compares the target value for the paving material height 330 with the paving material height 330 measured by the sensor 38. Based on a possible difference between the target value and the measured value, the vertical position of the height-adjustable pre-scraper plate 30 is then adjusted.

[0109] In Fig. 10 the cross distributor arrangement 9 is in the first position (as in Fig. 9 shown). The screed 7 is arranged in a second position at a second screed height 340 above the subsoil 3. The screed height 340 in Fig. 10 is greater than the screed height 340 in Fig. 9 Compared to the Fig. 9 In the first position of the pre-scraper plate 30 shown, the height-adjustable pre-scraper plate 30 is moved vertically upwards and is located in a second position, which results in a greater paving material height 330 in front of the screed 7. Due to the greater paving material height 330 in front of the screed 7, more paving material 6 is present in front of the screed 7, which is necessary for a greater screed height 340.

[0110] In Fig. 11 the screed 7 is in the second position (as in Fig. 10 shown) is arranged at the second screed height 340 above the subsoil 3. The transverse distributor arrangement 9 is arranged in a second position at a second auger height 320 above the subsoil 3. The auger height 320 in Fig. 11 is higher than the auger height 320 in Fig. 9 und 10 Compared to the Fig. 10 In the second position of the pre-scraper plate 30 shown, the height-adjustable pre-scraper plate 30 is moved vertically upwards and is in a third position, which leads to a greater paving material height 330 in front of the screed 7.

[0111] Fig. 12 shows a side sectional view of a section of a road paver according to the invention. Fig. 13 shows a perspective view from below of the Fig. 12 shown section. In contrast to Fig. 13 the left auger 17 and the right auger 18 are in Fig. 12not shown. The center bearing block 19 or the screw suspension 19 of the transverse distributor arrangement 9 is arranged in the direction of travel 100 between the deflector plate arrangement 26 and the pre-scraper plate 30. A further plate 40 is arranged on the front side of the pre-scraper plate 30. The further plate 40 is arranged between the pre-scraper plate 30 and the center bearing block 19. Viewed in the transverse direction 200, the further plate 40 is arranged in the region of the center bearing block 19. The side of the further plate 40 facing the center bearing block 19 can be aligned largely vertically. The further plate 40 can be designed to be adjustable in the direction of travel 100 or horizontally. This can be achieved, for example, by elongated holes 41 in the further plate 40. The elongated holes 41 extend in particular in the direction of travel 100 or horizontally.By adjusting the additional plate 40, the distance, in particular the horizontal distance, between the additional plate 40 and the center bearing block 19 can be adjusted. The additional plate 40 is attached to the pre-scraper plate 30 by fastening means 42, for example screws and nuts. The fastening means 42 extend through the elongated holes 41 in the additional plate 40. The position of the additional plate 40 in the direction of travel 100 can be adjusted by the position of the fastening means 42 in the elongated holes 41.

Claims

1. Road finisher (1) for producing a paving layer (2) from a paving material (6), comprising a paving screed (7) which comprises at least one base screed (10), a transverse distributor arrangement (9) which is designed to distribute the paving material (6) transversely to a direction of travel (100) of the road finisher (1) in front of the paving screed (7), and a pre-scraper arrangement (24) which is arranged behind the transverse distributor arrangement (9) in the direction of travel (100), characterized in that the pre-scraper arrangement (24) has a height-adjustable pre-scraper plate (30) arranged in the area of ​​the base screed (10).

2. Road paver according to claim 1, characterized in that the height-adjustable pre-scraper plate (30) can be moved in height during operation of the road finisher (1), in particular during a paving run of the road finisher (1).

3. Road paver according to claim 1 or 2, characterized in thatthe height-adjustable pre-scraper plate (30) is at least indirectly fastened to a suspension (19) of the transverse distributor arrangement (9).

4. Road paver according to claim 1 or 2, characterized in that the height-adjustable pre-scraper plate (30) is at least indirectly fastened to the paving screed (7), in particular the base screed (10).

5. Road paver according to one of the preceding claims, characterized in that the height-adjustable pre-scraper plate (30) can be moved in height relative to the transverse distributor arrangement (9).

6. Road paver according to one of the preceding claims, characterized in that the height-adjustable pre-scraper plate (30) can be moved in height relative to the paving screed (7), in particular the base screed (10).

7. Road paver according to one of the preceding claims characterized in that the pre-scraper arrangement (24) is arranged substantially between the transverse distributor arrangement (9) and the paving screed (7).

8. Road paver according to one of the preceding claims, characterized in that the paving screed (7) has extendable screed parts (11), wherein the extendable screed parts (11) are arranged laterally next to the base screed (10), wherein front edges (25) of the extendable screed parts (11) are arranged in front of a front edge (14) of the base screed (10) in the direction of travel (100).

9. Road paver according to one of the preceding claims, characterized in that the road paver (1) has a measuring system, wherein the measuring system is designed to measure the height of the paving material (6) between the transverse distributor arrangement (9) and the paving screed (7).

10. Road paver according to one of the preceding claims, characterized in that the road paver (1) has a control unit (37), wherein the control unit (37) is configured to adjust the height of the height-adjustable pre-scraper plate (30).

11. Road paver according to one of the preceding claims, characterized in thatthe height-adjustable pre-scraper plate (30) is rotatable about a rotation axis during operation of the road finisher (1), in particular during a paving run of the road finisher (1), wherein the rotation axis runs parallel to the direction of travel (100).

12. Road paver according to one of the preceding claims, characterized in that the height-adjustable pre-scraper plate (30) is a first height-adjustable pre-scraper plate (35) and the pre-scraper arrangement (24) additionally has a second height-adjustable pre-scraper plate (36), wherein the second height-adjustable pre-scraper plate (36) is arranged transversely to the direction of travel (100) next to the first height-adjustable pre-scraper plate (35), wherein the second height-adjustable pre-scraper plate (36) is designed to be vertically movable relative to the first height-adjustable pre-scraper plate (35).

13. A method for operating a road finisher (1), in particular a road finisher (1) according to one of the preceding claims, wherein the method comprises the following: - conveying paving material (6) opposite to a direction of travel (100) of the road finisher (1) in front of a paving screed (7) of the road finisher (1), and - distributing the paving material (6) in front of the paving screed (7) transversely to the direction of travel (100) of the road finisher (1) by means of a transverse distributor arrangement (9), wherein the road finisher (1) has a pre-scraper plate (30) which is arranged behind the transverse distributor arrangement (9) in the direction of travel (100), characterized in that the pre-scraper plate (30) is moved in height during operation of the road finisher (1), in particular during a paving run of the road finisher (1).

14. A method for operating a road finisher according to claim 13, characterized in thatthe pre-scraper plate (30) is automatically moved in height by a control unit (37) and / or by an operator input.

15. A method for operating a road finisher according to claim 13 or 14, characterized in that the method further comprises measuring the height of the paving material (6) in a region between the transverse distributor arrangement (9) and the paving screed (7) and adjusting the vertical position of the pre-scraper plate (30) based on the measured height of the paving material (6).

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