Road paver with height-adjustable pre-scraper blade

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 screed (7), a transverse distribution device (9) and a pre-scraper device (24). The screed (7) comprises at least one base screed (10). The transverse distribution device (9) is adapted to distribute the paving material (6) transversely to the direction of travel (100) of the road paver (1) in front of the screed (7). The pre-scraper device (24) is arranged behind the transverse distribution device (9) in the travel direction (100). The pre-scraper device (24) has a height-adjustable pre-scraper blade (30) which is arranged in the region of the base screed (10). The invention also relates to a method of operating a road paver (1).

Description

Technical Field

[0001] The present invention relates to a road paver and a method of operating a road paver. Background Art

[0002] A road paver is provided for generating a paving layer from a paving material (eg, asphalt), and generally includes a chassis and a working mechanism disposed on the chassis, such as a material hopper, a screed, a longitudinal conveying device, and a transverse distributing device.

[0003] A screed plate generally comprises a base screed plate and laterally adjacent extension screed plates. The extension screed plates can be used to change and adjust the width of the screed plate and the width of the paving layer (also called the working width). In front of the extension screed plates, a pre-screed blade with an adjustable height can be arranged in order to regulate the amount of paving material in front of the extension screed plates. This can reduce the forces acting on the extension screed plates due to the displacement resistance of the paving material. Such an arrangement of pre-screed blades is known from EP 2169117 B1. However, in the prior art, there are no known pre-screed blades with adjustable height located in front of the base screed plate. If the working width of the screed plate is changed rapidly, this can lead to overfilling of the screw channel and overflow of the paving material from the front wall of the screed plate, which can have a negative impact on the paving quality of the paving layer. Summary of the Invention

[0004] The object of the invention is to ensure a constant laying quality of the paving layer, in particular when the working width of the screed changes. This object is achieved by a road paver or a method for operating a road paver according to the invention.

[0005] According to a first aspect of the present invention, a road paver for producing a paving layer from paving material includes a screed, a transverse distribution device, and a pre-scraper device. The screed has at least one base screed. The transverse distribution device is adapted to distribute the paving material in front of the screed transversely to the direction of travel of the road paver. The pre-scraper device is arranged behind the transverse distribution device in the direction of travel. The pre-scraper device may have a height-adjustable pre-scraper blade. The height-adjustable pre-scraper blade may be arranged in the area of ​​the base screed.

[0006] The driving direction may correspond to the driving direction of the road paver during paving with paving material and is also referred to as paving direction. In the present application, the terms "driving direction" and "paving direction" may in particular be used as synonyms.

[0007] Height-adjustable pre-screed blades can be used to control or limit the amount of paving material in front of the screed, particularly the base screed. This allows the forces acting on the screed, particularly those caused by the paving material's resistance to displacement, to be controlled or limited. This means the screed may need to be less rigid. Furthermore, this ensures that the paving material is laid more evenly. Another advantage is that as the paving width increases, particularly by extending the extended screed section laterally, paving material can be transported more quickly to the side edge areas of the screed. Height-adjustable pre-screed blades can also reduce material segregation in the paving material.

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

[0009] The height-adjustable pre-scraper blade may extend substantially perpendicular to the direction of travel or the longitudinal axis of the road paver. The height-adjustable pre-scraper blade may extend substantially transverse to the direction of travel and in a vertical direction. The front side of the height-adjustable pre-scraper blade may be substantially perpendicular to the direction of travel.

[0010] The height-adjustable pre-scraper blade can be moved in height pneumatically, hydraulically, electrically, and / or mechanically. The pre-scraper device can have at least one pneumatic cylinder, at least one hydraulic cylinder, at least one electric motor, and / or at least one ratchet or crank, which are particularly suitable for moving the height-adjustable pre-scraper blade. The height-adjustable pre-scraper blade can be moved in height by remote control.

[0011] The height-adjustable pre-scraper blade may be adapted to be adjustable in its vertical position. The height-adjustable pre-scraper blade may be adapted to be adjustable in its vertical position relative to the transverse distribution device. The height-adjustable pre-scraper blade may be adapted to be adjustable in its vertical position relative to the screed, in particular the base screed.

[0012] The height-adjustable pre-scraper blade may be adapted to be movable in height. The height-adjustable pre-scraper blade may be adapted to be movable in height relative to the screed, in particular the base screed. The height-adjustable pre-scraper blade may be adapted to be movable in height relative to the transverse distribution device.

[0013] Adjustable-height pre-scraper blades allow the vertical distance between the pre-scraper assembly and the ground to be varied or adjusted. By maintaining a vertical distance between the pre-scraper assembly and the ground, the load on the screed, particularly the base screed, can be kept to a minimum. A small vertical distance between the pre-scraper assembly and the ground allows for better transport of paving material to the edge areas of the screed, particularly the extended screed portion of the screed.

[0014] The height-adjustable pre-scraper blade may be adapted to be steplessly / continuously movable.The vertical position of the height-adjustable pre-scraper blade may be steplessly / continuously adjusted.

[0015] In the present application, the term "height-adjustable" is to be understood in particular as meaning that the vertical position is adjustable.

[0016] The height-adjustable pre-scraper blade is movable in height by at least 50 mm, preferably at least 100 mm, preferably at least 200 mm. The height-adjustable pre-scraper blade is movable in height relative to the transverse distribution device by at least 50 mm, preferably at least 100 mm, preferably at least 200 mm. The height-adjustable pre-scraper blade is movable in height relative to the screed, in particular the base screed, by at least 50 mm, preferably at least 100 mm, preferably at least 200 mm. The height-adjustable pre-scraper blade is movable in height relative to the ground by at least 50 mm, preferably at least 100 mm, preferably at least 200 mm.

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

[0018] The width of the adjustable-height pre-scraper blade may correspond to the width of the screed plate. The width of the adjustable-height pre-scraper blade may correspond to the width of the base screed plate. The width of the adjustable-height pre-scraper blade may correspond to the combined width of the base screed plate and the extension. The width of the adjustable-height pre-scraper blade may correspond to the width of the transverse distribution channels or ducts of the road paver.

[0019] The road paver may include a longitudinal conveyor. The longitudinal conveyor may be arranged in front of the screed in the direction of travel. A transverse distribution device may be arranged upstream of the screed in the direction of travel. The transverse distribution device may be arranged downstream of the longitudinal conveyor in the direction of travel. The road paver may also include a material hopper for receiving paving material. The material hopper may be arranged upstream of the longitudinal conveyor in the direction of travel.

[0020] The road paver may include a driving gear. The driving gear may be arranged laterally to the longitudinal conveyor. The driving gear may include a left driving gear and a right driving gear. "Left" and "right" refer to the direction of travel of the road paver. The left driving gear may be arranged laterally to the left of the longitudinal conveyor. The right driving gear may be arranged laterally to the right of the longitudinal conveyor. The driving gears (particularly the left and right driving gears) may be track assemblies. The driving gears (particularly the left and right driving gears) may include wheels.

[0021] The height-adjustable pre-scraper blade can extend transversely to the direction of travel, in particular to the left and right, beyond the longitudinal conveyor. The height-adjustable pre-scraper blade can extend transversely to the direction of travel into the drive gear. The height-adjustable pre-scraper blade can be arranged behind the drive gear in the direction of travel. The height-adjustable pre-scraper blade can extend transversely to the direction of travel from the left end to the right end of the drive gear. The height-adjustable pre-scraper blade can extend transversely to the direction of travel from the outer side of the left drive gear to the outer side of the right driving gear.

[0022] The height-adjustable pre-scraper blade can extend transversely to the direction of travel from the left end to the right end of the base screed. The height-adjustable pre-scraper blade can extend transversely to the direction of travel, in particular to the left and to the right, beyond the base screed.

[0023] The transverse distribution device may include at least one distribution screw. The transverse distribution device may include a left distribution screw and a right distribution screw. The left distribution screw and the right distribution screw may each extend approximately transversely to the direction of travel. The left distribution screw and the right distribution screw may be supported by a suspension (in the form of a screw suspension or a central bearing block). The transverse distribution device may have further distribution screws.

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

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

[0026] The height-adjustable pre-scraper blade can be attached at least indirectly to the suspension of the transverse distribution device. The height-adjustable pre-scraper blade can be attached to the suspension of the transverse distribution device via an intermediate component, such as a supporting structure. The height-adjustable pre-scraper blade can be attached directly to the suspension of the transverse distribution device. The suspension of the transverse distribution device and the height-adjustable pre-scraper blade can be attached to the same component. The suspension of the transverse distribution device can be attached to the transverse distribution fixture. The height-adjustable pre-scraper blade can also be attached to the transverse distribution fixture.

[0027] The height-adjustable pre-scraper blade may be attached at least indirectly to the screed, in particular the base screed. The height-adjustable pre-scraper blade may be attached to the screed, in particular the base screed, via an intermediate element, such as a support structure. The height-adjustable pre-scraper blade may be attached directly to the screed, in particular the base screed.

[0028] The transverse distribution device is movable in height (particularly relative to the screed). The transverse distribution device is movable in height relative to the ground. The transverse distribution fixture or the suspension for the transverse distribution device can be attached to the chassis of the road paver via a cylinder. The vertical position of the transverse distribution fixture, the suspension for the transverse distribution device, the height-adjustable pre-scraper blade, and / or the transverse distribution device can be adjusted via a cylinder. The cylinder can be pneumatic, hydraulic, or electric.

[0029] The height-adjustable pre-scraper blade can be moved in height relative to the transverse distribution device. The vertical position of the pre-scraper blade can be adjusted relative to the transverse distribution device. An adjustment device disposed between the height-adjustable pre-scraper blade and the transverse distribution device can be adapted to move the height of the height-adjustable pre-scraper blade relative to the transverse distribution device. The adjustment device can include at least one pneumatic cylinder, a hydraulic cylinder, or an electric cylinder. The adjustment device can include an electric motor. The adjustment device can include a ratchet or a crank.

[0030] The height-adjustable pre-scraper blade can be moved relative to a screed plate (particularly a base screed plate). The vertical position of the pre-scraper blade can be adjusted relative to the screed plate (particularly the base screed plate). An adjustment assembly disposed between the height-adjustable pre-scraper blade and the screed plate (particularly the base screed plate) can be adapted to move the height of the height-adjustable pre-scraper blade relative to the screed plate (particularly the base screed plate). The adjustment device can include at least one pneumatic, hydraulic, or electric cylinder. The adjustment device can include an electric motor. The adjustment device can include a ratchet or a crank.

[0031] The pre-scraper device can be arranged substantially (especially in the direction of travel) between the transverse distribution device and the screed. The height-adjustable pre-scraper blade can be arranged substantially (especially in the direction of travel) between the transverse distribution device and the base screed.

[0032] The term "substantially" should be interpreted in particular to mean that the areas of the individual components may also overlap. The center of gravity of the pre-scraper arrangement 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 screed plate (particularly the center of gravity of the base screed plate). The center of gravity of the height-adjustable pre-scraper blade 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 plate.

[0033] The paving material can be transported from the longitudinal transport device to the transverse distribution device in a direction opposite to the travel direction of the road paver. The paving material can be transported under the pre-scraper device (especially the pre-scraper blade) to the screed (especially the base screed).

[0034] In addition to the base screed, the screed may also have an extension screed section. The extension screed section may be arranged laterally alongside the base screed, in particular on both sides of the base screed. The extension screed section may be arranged offset to the base screed in the direction of travel.

[0035] The extension screed section or the front edge of the extension screed section may be arranged in front of the base screed section or in front of the front edge of the base screed section in the direction of travel. The screed section may be a front-mounted screed section, also called a front screed section.

[0036] The extension screed section or the front edge of the extension screed section may be arranged behind the base screed section or behind the front edge of the base screed section in the direction of travel. The screed section may be a rear screed section, also called a rear screed section.

[0037] The paving machine may be equipped with a measuring system. The measuring system may be arranged in the direction of travel between the transverse distribution device and the screed, in particular the base screed.

[0038] The measuring system may be adapted to measure the amount of paving material in front of a screed, in particular a base screed. The amount of paving material particularly refers to the amount of paving material directly in front of the screed or base screed.

[0039] The measuring system can be adapted to measure the height of the paving material between the lateral distribution device and the screed. The height of the paving material is specifically the vertical distance between the upper edge of the paving material and the ground. The measuring system can be adapted to detect or measure the upper edge of the paving material between the lateral distribution device and the screed, in particular the base screed.

[0040] The measuring system may be adapted to perform measurements continuously and / or at predetermined time intervals.

[0041] The measuring system may include at least one sensor. The at least one sensor may be arranged in the direction of travel between the transverse distribution device and the screed, in particular the base screed. The at least one sensor may be arranged between the pre-screed device and the screed. The at least one sensor may be arranged between the height-adjustable pre-screed blade and the base screed.

[0042] At least one sensor may be an optical sensor. At least one sensor may be a mechanical sensor. At least one sensor may be a rotary encoder, particularly a rotary encoder having a mechanical sensor arm. At least one sensor may be an electro-optical sensor. At least one sensor may be a laser rangefinder. At least one sensor may be an infrared rangefinder. At least one sensor may be an ultrasonic sensor. At least one sensor may be a camera or multiple cameras.

[0043] A road paver may have multiple sensors. These sensors may be distributed along the direction of travel. A first sensor may be located in front of the base screed. A second sensor may be located in front of a first extended screed section, particularly to the left of the base screed in the transverse direction. A third sensor may be located in front of a second extended screed section, particularly to the right of the base screed in the transverse direction.

[0044] The road paver may also be equipped with one or more distribution auger sensors. The one or more distribution auger sensors may be adapted to determine the vertical position of the transverse distribution device, in particular the vertical distance between the ground and a rotation axis of the transverse distribution device extending in the transverse direction.

[0045] The road paver may also have one or more screed sensors. The one or more screed sensors may be adapted to determine the vertical position of the screed, in particular the vertical distance between the ground and the lower edge of the base screed.

[0046] The height-adjustable pre-scraper blades, particularly the left and second height-adjustable pre-scraper blades, can have a protrusion on their lower edges pointing in the direction of travel. When viewed in the transverse direction, the protrusion can have a triangular cross-section, particularly a right-angled triangle. The surface of the pre-scraper blade formed by the hypotenuse of the triangle can point in the direction of travel.

[0047] The road paver may have a control unit. The control unit may be configured to adjust the height of the height-adjustable pre-scraper blade, in particular during operation of the road paver or during a paving operation of the road paver.

[0048] The control unit may be adapted to receive data from the measurement system. The control unit may be adapted to receive data from the measurement system wirelessly. Data transmission between the control unit and the measurement system may be performed, for example, via Bluetooth, WLAN (Wi-Fi), or a similar method. Data transmission between the control unit and the measurement system may also be performed via a cable.

[0049] The control unit can be configured, in particular in combination with the measuring system, to regulate or control the feed of the paving material upstream of the screed. The control unit can be configured, in particular in combination with the measuring system, to keep the feed of the paving material in front of the screed as constant as possible, in particular according to a predetermined target value.

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

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

[0052] By adjusting the vertical position of the pre-screed blade, you can influence the amount of paving material in front of the screed or the height of the paving material between the pre-screed device and the screed. Lowering the pre-screed blade allows a lower height or amount of paving material to be fed directly in front of the screed (especially the base screed). Raising the pre-screed blade allows a greater height or amount of paving material to be fed directly in front of the screed (especially the base screed).

[0053] During operation of the road paver, the pre-scraper blade can rotate about a rotation axis. Specifically, the rotation axis extends parallel to the direction of travel. The rotation axis can be centrally located relative to the transverse direction of the road paver. The height-adjustable pre-scraper blade can rotate about the rotation axis during operation of the road paver or during paving operations performed by the road paver.

[0054] At bends or dips in the transverse profile of the paving layer, different amounts of paving material are laid from the left to the right side of the screed. Specifically, this requires different heights or amounts of paving material in front of the screed (as viewed in the transverse direction). Consider rotating the height-adjustable pre-screed blade to achieve this.

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

[0056] The height-adjustable pre-scraper blade can be rotated through an angle between -10 degrees and +10 degrees, preferably between -3 degrees and +3 degrees. The control unit can be configured to rotate the height-adjustable pre-scraper blade through an angle between -10 degrees and +10 degrees, preferably between -3 degrees and +3 degrees. This angle is particularly understood to mean a deviation from the horizontal. Specifically, at an angle of 0 degrees, the lower edge of the height-adjustable pre-scraper blade is aligned horizontally.

[0057] The control unit may be configured to adjust or control the rotation of the height-adjustable pre-squeegee blade based on the current installation situation (e.g., a turn and / or a lateral tilt). The control unit may be adapted to adjust or control the rotation of the height-adjustable pre-squeegee blade based on the current installation situation in combination with one or more measurement values ​​of the measurement system.

[0058] The height-adjustable pre-scraper blade may be a first height-adjustable pre-scraper blade. The pre-scraper device may further include a second height-adjustable pre-scraper blade. The second height-adjustable pre-scraper blade may be arranged transversely to the direction of travel, adjacent to the first height-adjustable pre-scraper blade. The second height-adjustable pre-scraper blade may be movable in height relative to the first height-adjustable pre-scraper blade.

[0059] Arranging two or more height-adjustable pre-scraper blades could be an alternative solution for cornering or sideways tilting. However, the arrangement of two or more height-adjustable pre-scraper blades can also be combined with a rotatable, height-adjustable pre-scraper blade. The two or more height-adjustable pre-scraper blades can rotate about the same or different axes of rotation.

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

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

[0062] The first height-adjustable pre-scraper blade and the second height-adjustable pre-scraper blade can be vertically moved relative to each other between 0 mm and 150 mm, preferably between 0 mm and 50 mm, more preferably between 0 mm and 100 mm. The control unit can be configured to vertically move the first height-adjustable pre-scraper blade and the second height-adjustable pre-scraper blade relative to each other between 0 mm and 150 mm, preferably between 0 mm and 100 mm, more preferably between 0 mm and 50 mm.

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

[0064] The height-adjustable pre-scraper blades (particularly the first height-adjustable pre-scraper blade and the second height-adjustable pre-scraper blade) can be adapted to be steplessly adjusted. The vertical position of the height-adjustable pre-scraper blades (particularly the first height-adjustable pre-scraper blade and the second height-adjustable pre-scraper blade) can be steplessly adjusted.

[0065] The control unit may be adapted to move the height-adjustable pre-scraper blade steplessly in height. The control unit may be adapted to move the first height-adjustable pre-scraper blade and the second height-adjustable pre-scraper blade steplessly in height. The control unit may be adapted to rotate the height-adjustable pre-scraper blade steplessly.

[0066] The first height-adjustable pre-scraper blade and the second height-adjustable pre-scraper blade can both be rotated by an angle between -10 degrees and +10 degrees, preferably by an angle between -3 degrees and +3 degrees. The control unit can be configured to rotate the height-adjustable pre-scraper blade by an angle between -10 degrees and +10 degrees, preferably by an angle between -3 degrees and +3 degrees. The control unit can be configured to rotate the first height-adjustable pre-scraper blade by an angle between -10 degrees and +10 degrees, preferably by an angle between -3 degrees and +3 degrees, in particular independently of the second height-adjustable pre-scraper blade. The control unit can be configured to rotate the second height-adjustable pre-scraper blade by an angle between -10 degrees and +10 degrees, preferably by an angle between -3 degrees and +3 degrees, in particular independently of the first height-adjustable pre-scraper blade. The control unit can be configured to rotate the first height-adjustable pre-scraper blade together with the second height-adjustable pre-scraper blade.

[0067] This angle is to be understood as a deviation from the horizontal. Specifically, at an angle of 0 degrees, the lower edge of the height-adjustable pre-scraper blade is aligned horizontally.

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

[0069] The control unit may be configured to adjust or control the rotation of the height-adjustable pre-squeegee blade based on the current installation situation (e.g., a turn and / or a lateral tilt). The control unit may be adapted to adjust or control the rotation of the height-adjustable pre-squeegee blade based on the current installation situation in combination with one or more measurement values ​​of the measurement system.

[0070] The pre-scraper blade arrangement may also be equipped with an additional plate. The additional plate may be adapted to be adjustable, in particular height-adjustable. The additional plate may be adapted to be adjustable in the direction of travel or against the direction of travel, or horizontally. The additional plate may be arranged in the direction of travel between the height-adjustable pre-scraper blade and the transverse distribution device, in particular the central bearing block of the transverse distribution device. The additional plate may have a positive influence on the segregation of the paving material in the region of the central bearing block. The additional plate may reduce the space behind the central bearing block, in particular by adjusting it in the direction of travel or horizontally. By adjusting the additional plate, the horizontal distance between the additional plate and the central bearing block may be adjusted. The additional plate may prevent or reduce the cooling of the paving material in the region behind the central bearing block. The additional plate, in particular a metal plate, may have an elongated hole. The elongated hole may extend in the direction of travel or horizontally.

[0071] According to a second aspect of the present invention, a method for operating a road paver includes conveying paving material in front of a screed plate of the road paver counter to the direction of travel of the road paver and distributing the paving material in front of the screed plate transversely to the direction of travel of the road paver via a transverse distribution device. The road paver includes a pre-scraper blade arranged behind the transverse distribution device in the direction of travel and transversely to the direction of travel in a base screed area of ​​the screed plate. During operation of the road paver, particularly during paving operations of the road paver, the pre-scraper blade can be moved in height and / or rotated. The road paver is adjustable according to the first aspect of the present invention.

[0072] The pre-scraper blade can be adjusted in the same manner as the height-adjustable pre-scraper blade described in the first aspect of the present invention. A road paver can include a pre-scraper assembly, particularly including a pre-scraper blade. The pre-scraper assembly can be adjusted in the same manner as the pre-scraper assembly described in relation to the first aspect of the present invention.

[0073] The height of the pre-scraper blade may be automatically adjusted by the control unit. The pre-scraper blade may be moved in height by operator input. The control unit may be adjusted as described in relation to the first aspect of the invention.

[0074] The method may further include measuring the height of the paving material in the area between the transverse distribution device and the screed plate, in particular the height of the paving material in the area between the pre-screed blade and the screed plate. The method may further include adjusting the height or vertical position of the pre-screed blade based on the measured height of the paving material.

[0075] The height or vertical position of the pre-screed blade may 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 may be measured by a measuring system. The measuring system may be adapted like the measuring system described in relation to the first aspect of the invention.

[0077] Alternatively or in addition to adjusting the height of the pre-scraper blade, the method may further include rotating the pre-scraper blade about an axis parallel to the direction of travel. Rotation of the pre-scraper blade may occur based on a measured height of the paving material. Rotation of the pre-scraper blade may occur based on a 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 the first pre-scraper blade and the second pre-scraper blade.The method may include adjusting the rotation of the first pre-scraper blade and the second pre-scraper blade.

[0079] The road paver according to the first aspect of the invention may be used together with the method steps of the method according to the second aspect of the invention.The method according to the second aspect of the invention may be performed using the road paver according to the first aspect of the invention.

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

[0081] The terms "first," "second," "third," and "fourth" should be understood as identifying specific elements or components only and do not necessarily indicate a specific order or combination of the components or elements. For example, the presence of a fourth element does not necessarily imply the presence of a first, second, or third element, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Advantageous embodiments of the invention will be explained in more detail below with reference to the accompanying drawings.

[0083] Figure 1 A side view of a road paver according to the invention is shown.

[0084] Figure 2 A perspective view of a road paver according to the invention is shown.

[0085] Figure 3 A top view of the longitudinal conveying device, the transverse distribution device and the screed of the road paver according to the invention is shown.

[0086] Figure 4 Shown Figure 3 A top view of an alternative embodiment of the screed according to the invention is shown.

[0087] Figure 5 A side cross-sectional view of a portion of a road paver according to the invention is shown.

[0088] Figure 6 A perspective view of a pre-scraper device, a lateral distribution device and a deflector device of a road paver according to the present invention is shown.

[0089] Figure 7 Shown Figure 6 A perspective view of an alternative embodiment of a deflector plate arrangement according to the present invention is shown in FIG.

[0090] Figure 8 Shown Figure 6 A perspective view of another alternative embodiment of a pre-scraper device according to the present invention is shown in FIG.

[0091] Figure 9 A side sectional view of a portion of a road paver according to the invention is shown in a first position.

[0092] Figure 10 A side sectional view of a portion of a road paver according to the invention is shown in a second position.

[0093] Figure 11 A side sectional view of a portion of a road paver according to the invention is shown in a third position.

[0094] Figure 12 A perspective view from the side is shown of a portion of a road paver according to the invention.

[0095] Figure 13 The road paver according to the present invention is shown Figure 12 A perspective view of the shown part, viewed from below. DETAILED DESCRIPTION

[0096] Figure 1 and Figure 2 A side view and a perspective top view of a road paver 1 according to the present invention are shown for producing a paving layer 2 on a ground surface 3. The road paver 1 has a material hopper 4 at the front, in the paving direction 100. The paving material 6 contained in the hopper is conveyed from the material hopper 4 to the screed 7 of the road paver 1 by a longitudinal conveying device 5, counter to the paving direction 100 of the road paver 1. The longitudinal conveying device 5 is arranged in the chassis 8 of the road paver 1 and initially conveys the paving material 6 to a transverse distribution device 9 arranged in front of the screed 7 in the paving direction 100. The transverse distribution device 9 is adapted to distribute the paving material 6 in front of the screed 7 along a transverse direction 200, which is transverse to the paving direction 100.

[0097] The extension of the paving layer 2 in the transverse direction 200 is referred to as the working width 210 or paving width 210. The screed 7 has a screed base 10 and a laterally extendable extension screed section 11. The working width 210 of the paving layer 2 can be varied and adjusted by laterally extending the extension screed section 11.

[0098] The paving machine 1 also has a control unit 37. The control unit 37 can be operated by user input or automatically. The control unit 37 is adapted to adjust the vertical position of the height-adjustable pre-scraper blade 30. The control unit 37 is configured to move the height-adjustable pre-scraper blade 30 in height.

[0099] Figure 3 A schematic top view of the screed 7 and longitudinal conveyor 5 of a road paver 1 according to the present invention is shown. The longitudinal conveyor 5 has a conveyor belt in the form of a scraper belt 12. The scraper belt 12 comprises a left scraper belt section 13a and a right scraper belt section 13b. The references "left" and "right" are to be understood as referring to the paving direction of travel 100.

[0100] The paving material 6 that has fallen by means of the scraper belt 12 in front of the base screed 10 body of the screed 7 is distributed by the lateral distribution device 9 along the front side 14 of the base screed 10 body, as indicated by arrows 220 .

[0101] The rear wall 15 of the chassis 8 of the road paver 1 forms together with the front side 14 of the body of the base screed 10 a transverse distribution channel 16 for the transverse distribution device 9 , which is also referred to as a screw chamber.

[0102] The extension screed part 11 of the screed 7 can be extended laterally relative to the base screed 10 body in the transverse direction 200, thereby allowing the screed 7 to be widened and the working width 210 to be changed. The transverse distribution channel 16 can be further extended laterally according to the widening of the screed 7.

[0103] The paving material 6 is transferred from the scraper belt 12 of the longitudinal conveyor 5 to a transverse distribution device 9 located in front of the screed 7. The transverse distribution device 9 is adapted to distribute the paving material 6 in front of the screed 7 in a transverse distribution channel 16 along a transverse direction 200 transverse to the paving travel direction 100.

[0104] Attached to the rear end of the chassis 8 of the paving machine 1 is a transverse distribution device 9. The transverse distribution device 9 comprises a left distribution screw 17 and a right distribution screw 18. Both the left distribution screw 17 and the right distribution screw 18 are supported on a suspension in the form of a screw suspension 19. The screw suspension 19 can also be referred to as a central bearing block.

[0105] The housing formed by the screw suspension 19 contains a worm drive (not shown) for powering the two dispensing screws 17, 18. The transverse dispensing device 9 includes a shaft 20, which can be two separate shafts (left shaft 21 and right shaft 22) or a single shaft shared by the two dispensing screws 17, 18. The left dispensing screw 17 is removably coupled to the left shaft 21. The right dispensing screw 18 is removably coupled to the right shaft 22. The outer end of each of the left and right shafts 21, 22, i.e., the end facing away from the screw suspension 19, is supported in a spiral bearing 23.

[0106] Figure 3 The pre-scraper device 24 according to the present invention is not shown in FIG. The position of the pre-scraper device 24 is indicated by the reference numeral 24 .

[0107] exist Figure 3 In the embodiment shown, the front edge 14 of the base screed body 10 is arranged in front of the front edge 25 of the extension screed portion 11 in the direction of travel 100. This form of screed 7 is called a rear screed or a rear screed.

[0108] Figure 4 An alternative embodiment of the screed 7 of the road paver 1 according to the invention is shown in a top view. Figure 3 Compared to the embodiment in FIG, the front edge 25 of the extension screed section 11 is arranged in front of the front edge 14 of the base screed 10 in the direction of travel 100. This form of screed 7 is called a front screed or front screed.

[0109] exist Figure 4 In the illustration shown, the extension screed section 11 is in the extended position. Figure 4 The transverse distribution device 9 and the pre-scraper device 24 according to the present invention are not shown in FIG. The position of the transverse distribution device 9 is marked in the transverse distribution channel 16.

[0110] The road paver 1 can have a deflector device 26, which is arranged in the direction of travel 100 between the longitudinal conveying device 5 and the transverse distribution device 9. The deflector device 26 can have height-adjustable deflectors.

[0111] Figure 5 A side sectional view of a portion of a road paver 1 according to the invention is shown. The screw suspension 19 of the transverse distribution device 9 is attached to the chassis 8 by means of a cylinder 27 in a height-adjustable manner. Figure 5 The paving material height 28 of the paving material 6 is shown in dashed lines in FIG.

[0112] The pre-scraper device 24 is attached to the chassis 8 or the spiral suspension 19 via a bracket 29. Alternatively, the bracket 29 can be attached to the screed 7. The pre-scraper device 24 has a pre-scraper blade 30. The pre-scraper blade 30 is adapted to move up and down relative to the bracket 29 in a vertical direction 300.

[0113] Figure 6 A perspective view of a road paver 1 according to the invention is shown of a pre-scraper device 24, a transverse distribution device 9 and a deflector device 26. The deflector device 26 is optional.

[0114] The pre-scraper device 24 has a support structure 31. The support structure 31 is mounted on the spiral suspension 19. The pre-scraper blade 30 is mounted on the support structure 31 by means of an adjustment device 32 in the form of a hydraulic cylinder or a pneumatic cylinder. The adjustment device 32 can be used to adjust the vertical position of the pre-scraper blade 30.

[0115] Figure 7 and Figure 8 Shown Figure 6 A perspective view of an alternative embodiment of the pre-scraper assembly 24 is shown in FIG.

[0116] Figure 7 The pre-scraper device 24 shown in FIG has a pre-scraper blade 30 that is adapted to rotate about an axis parallel to the direction of travel 100 through an angle 400. The rotation of the pre-scraper blade 30 can be achieved by means of an adjustment device 32. In particular, the adjustment device 32 has a left actuating element 33 and a right actuating element 34, which can be controlled independently of one another, in particular by means of a control unit 37.

[0117] Figure 8 The illustrated pre-scraper device 24 has a first, height-adjustable pre-scraper blade in the form of a left pre-scraper blade 35 and a second, height-adjustable pre-scraper blade in the form of a right pre-scraper blade 36. The left pre-scraper blade 35 and the right pre-scraper blade 36 can be moved in height independently of one another. Consequently, a vertical offset 310 can be achieved between the left pre-scraper blade 35 and the right pre-scraper blade 36. In particular, the adjustment device 32 has a left actuating element 33 and a right actuating element 34, which can be controlled independently of one another, in particular by a control unit 37. The vertical offset 310 between the left pre-scraper blade 35 and the right pre-scraper blade 36 is achieved by individually controlling the left actuating element 33 and the right actuating element 34.

[0118] Alternatively or in addition to height adjustment, the left and right pre-scraper blades 35 and 36 may be adapted to rotate about an axis extending parallel to the direction of travel 100. The left pre-scraper blade 35 may be adapted to rotate about a first axis parallel to the direction of travel 100 by a first angle 410. The right pre-scraper blade 36 may be adapted to rotate about a second axis parallel to the direction of travel 100 by a second angle 420. Rotation of the left pre-scraper blade 35 may be achieved via the left actuating element 33. Rotation of the right pre-scraper blade 36 may be achieved via the right actuating element 34. The adjustment device 32 may have further actuating elements, in particular a second left actuating element and a second right actuating element, adapted to rotate the left and right pre-scraper blades, respectively. The control unit may be adapted to rotate the left and right pre-scraper blades 35 and 36 by the same angle. The control unit may also be adapted to rotate the left and right pre-scraper blades 35 and 36 by different angles, in particular in different directions.

[0119] Figures 9 to 11 A side sectional view of a portion of a road paver 1 according to the present invention is shown. The road paver 1 has a measuring system (not referenced). The measuring system comprises a sensor 38. The sensor 38 is arranged between the transverse distribution device 9 and the screed 7, in particular between the height-adjustable pre-screed blade 30 and the base screed 10. The sensor 38 is aligned downward and is configured to measure the vertical distance between the sensor 38 and the upper edge of the paving material 6. Using the measured distance and the position of the sensor 38, the sensor 38 and / or the control unit 37 can determine the paving material height 28 below the sensor 38. The paver 1 can also have a plurality of sensors 38.

[0120] The distributing screw height 320 of the distributing screw 17 is defined as the vertical distance between the distributing screw rotation axis 39 extending in the transverse direction 200 and the ground surface 3. The paving material height 28 between the adjustable-height pre-screed blade 30 and the base screed 10 is shown with reference numeral 330 and is defined as the vertical distance between the upper edge of the paving material 6 and the ground surface 3. The screed height 340 is defined as the vertical distance between the screed 7 (particularly the base screed 10) and the ground surface 3.

[0121] exist Figure 9In the embodiment of the present invention, the transverse distributing device 9 is arranged in a first position at a first distributing screw height 320 above the ground surface 3. The screed plate 7 is arranged in a second position at a first screed plate height 340 above the ground surface 3. The required amount of paving material 6 upstream of the screed plate 7 or a target value for the paving material height 330 upstream of the screed plate 7 can be determined by the control unit 37, for example based on the distributing screw height 320 and the screed plate height 340. Alternatively, the target value for the paving material height 330 upstream of the screed plate 7 can be set 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. Depending on any discrepancy between the target value and the measured value, the vertical position of the height-adjustable pre-screed blade 30 is adjusted.

[0122] exist Figure 10 In the embodiment, the lateral distribution device 9 is arranged in the first position (such as Figure 9 The screed 7 is arranged in a third position at a second screed height 340 above the ground 3 . Figure 10 The screed height in 340 is greater than Figure 9 Screed height 340. Figure 9 Compared to the first height of the pre-scraper blade 30 shown, Figure 10 The height-adjustable pre-screed blade 30 is shown moved vertically upward and at a second height, which allows it to be fed to a greater screed 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 available in front of the screed 7, which is necessary for the greater screed height 340.

[0123] exist Figure 11 In the embodiment, the screed 7 is arranged at a second position (eg, Figure 10 The transverse distribution device 9 is arranged in a fourth position at a second distribution screw height 320 above the ground 3 . Figure 11 The distribution screw height is 320 higher than Figure 9 and Figure 10 The distribution screw height is 320. Figure 10 Compared to the second height of the pre-screed blade 30 shown, the height-adjustable pre-screed blade 30 is moved vertically upwards and is at a third height, which is feedable to a greater screed height 330 in front of the screed 7 .

[0124] Figure 12 A side cross-sectional view of a portion of a road paver according to the invention is shown. Figure 13 Shows Figure 12 A perspective view of the portion shown in from below. Figure 13 on the contrary, Figure 12 The left and right distributing screws 17 and 18 are not shown. The central bearing block 19 or screw suspension 19 of the transverse distributing device 9 is arranged between the deflector plate arrangement 26 and the pre-scraper blade 30 in the direction of travel 100. An additional plate 40 is provided in front of the pre-scraper blade 30. This additional plate 40 is arranged between the pre-scraper blade 30 and the central bearing block 19. When viewed in the transverse direction 200, the additional plate 40 is arranged in the region of the central bearing block 19. The side of the additional plate 40 facing the central bearing block 19 can be largely vertically aligned. The additional plate 40 can be adapted to be adjustable in the direction of travel 100 or horizontally. This can be achieved, for example, by means of an elongated hole 41 in the additional plate 40. The elongated hole 41 can extend in particular in the direction of travel 100 or horizontally. By adjusting the additional plate 40, the distance between the additional plate 40 and the central bearing block 19, particularly the horizontal distance, can be adjusted. The additional plate 40 is attached to the pre-scraper blade 30 by fastening means 42 (e.g., screws and nuts). The fastening device 42 extends through an elongated hole 41 in the additional plate 40. The position of the fastening device 42 in the elongated hole 41 can be used to adjust the position of the additional plate 40 in the direction of travel 100.

Claims

1. A road paver (1) for producing a paving layer (2) from a paving material (6), the road paver (1) comprising: a screed plate (7) comprising at least one base screed plate (10), a transverse distribution device (9) for distributing the paving material (6) transversely to the travel direction (100) of the road paver (1) in front of the screed (7), and a pre-scraper device (24) arranged behind the transverse distribution device (9) in the travel direction (100), It is characterized by: The pre-scraper device (24) has a height-adjustable pre-scraper blade (30), which is arranged in the region of the base screed (10).

2. The road paver according to claim 1, characterized in that: The height-adjustable pre-scraper blade (30) is movable in height during operation of the road paver (1).

3. The road paver according to claim 2, characterized in that: The height-adjustable pre-scraper blade (30) is movable in height during the paving operation of the road paver (1).

4. The road paver according to claim 1, characterized in that: The height-adjustable pre-scraper blade (30) is at least indirectly attached to the suspension (19) of the transverse distribution device (9).

5. The road paver according to claim 2, characterized in that: The height-adjustable pre-scraper blade (30) is at least indirectly attached to the suspension (19) of the transverse distribution device (9).

6. The road paver according to claim 1, characterized in that: The height-adjustable pre-scraper blade (30) is at least indirectly attached to the screed (7).

7. The road paver according to claim 6, characterized in that: The height-adjustable pre-scraper blade (30) is at least indirectly attached to the base screed (10).

8. The road paver according to claim 2, characterized in that: The height-adjustable pre-scraper blade (30) is at least indirectly attached to the screed (7).

9. The road paver according to claim 8, characterized in that: The height-adjustable pre-scraper blade (30) is at least indirectly attached to the base screed (10).

10. The road paver according to any one of claims 1 to 9, characterized in that: The height-adjustable pre-scraper blade (30) is movable in height relative to the transverse distribution device (9).

11. The road paver according to any one of claims 1 to 9, characterized in that: The height-adjustable pre-scraper blade (30) is movable in height relative to the screed (7).

12. The road paver according to claim 11, characterized in that: The height-adjustable pre-scraper blade (30) is movable in height relative to the base screed (10).

13. The road paver according to any one of claims 1 to 9, characterized in that: The pre-scraper device (24) is arranged substantially between the transverse distribution device (9) and the screed (7).

14. The road paver according to any one of claims 1 to 9, characterized in that: The screed plate (7) has an extension screed plate portion (11), wherein the extension screed plate portion (11) is arranged laterally beside the base screed plate (10), wherein a front edge (25) of the extension screed plate portion (11) is arranged in front of a front edge (14) of the base screed plate (10) in the direction of travel (100).

15. The road paver according to any one of claims 1 to 9, characterized in that The road paver (1) has a measuring system, wherein the measuring system is adapted to measure the height of the paving material (6) between the transverse distribution device (9) and the screed (7).

16. The road paver according to any one of claims 1 to 9, 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 blade (30).

17. The road paver according to any one of claims 1 to 9, characterized in that The height-adjustable pre-scraper blade (30) is rotatable about a rotation axis during operation of the road paver (1), wherein the rotation axis extends parallel to the direction of travel (100).

18. The road paver according to claim 17, characterized in that: The height-adjustable pre-scraper blade (30) is rotatable about the rotation axis during paving operations of the road paver (1).

19. The road paver according to any one of claims 1 to 9, characterized in that: The height-adjustable pre-scraper blade (30) is a first height-adjustable pre-scraper blade (35), and the pre-scraper device (24) also has a second height-adjustable pre-scraper blade (36), wherein the second height-adjustable pre-scraper blade (36) is arranged next to the first height-adjustable pre-scraper blade (35) transversely to the travel direction (100), wherein the second height-adjustable pre-scraper blade (36) is suitable for being movable in height relative to the first height-adjustable pre-scraper blade (35).

20. A method for operating a road paver (1), wherein the method comprises the following steps: - conveying the paving material (6) in front of the screed (7) of the road paver (1) in the opposite direction of travel (100) of the road paver (1), and - distributing the paving material (6) in front of the screed (7) transversely to the direction of travel (100) of the road paver (1) by means of a transverse distribution device (9), The road paver (1) has a pre-scraper blade (30) arranged behind the transverse distribution device (9) along the travel direction (100), It is characterized by: The pre-scraper blade (30) moves in height during operation of the road paver (1).

21. The method for operating a road paver according to claim 20, wherein: The road paver (1) is a road paver (1) according to any one of claims 1 to 19.

22. The method for operating a road paver according to claim 20, wherein: The pre-scraper blade (30) moves in height during the paving operation of the road paver (1).

23. The method of operating a road paver according to claim 20, wherein: The pre-scraper blade (30) is moved in height automatically by a control unit (37) and / or by an operator's input.

24. The method for operating a road paver according to any one of claims 20 to 23, characterized in that: The method further comprises measuring the height of the paving material (6) in the area between the transverse distribution device (9) and the screed plate (7), and adjusting the vertical position of the pre-scraper blade (30) according to the measured height of the paving material (6).

Images