Road paver with height-adjustable press scraper blade

Abstract

To maintain integrity of pavement quality of a paving layer when the effective width of a screed is changed.SOLUTION: The present invention relates to a road paver for making a paving layer (2) from paving materials (6). The road paver includes a screed (7), a lateral distribution device (9), and a press scraper device (24). The screed (7) includes at least one base screed (10). The lateral distribution device (9) is adapted to distribute paving materials (6) in front of the screed (7) transversely to the traveling direction (100) of the road paver. The press scraper device (24) is arranged behind the lateral distribution device (9) in the traveling direction (100). The press scraper device (24) has a height adjustable press scraper blade (30) arranged in the area of the base screed (10). The present invention also relates to a method for operating a road paver.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] A road paver is provided for producing paving layers from paving materials such as asphalt, and generally includes a chassis and a work assembly arranged on the chassis, the work assembly including a material hopper, a screed, a longitudinal (longitudinal) conveying device, a lateral distribution device, etc.

[0003] A screed typically has a base screed and laterally adjacent extension screed elements. The width of the screed, and therefore the width of the paving layer, also known as the effective width, can be changed and adjusted using the extension screed elements. To adjust the amount of paving material ahead of the extension screed elements, a height-adjustable press scraper blade can be arranged ahead of the extension screed elements. This reduces the force on the extension screed elements caused by the resistance of the paving material to being pushed away. Such a press scraper blade arrangement is known from EP 2169117 B1. A height-adjustable press scraper blade ahead of the base screed is not known in the prior art. Abrupt changes in the screed's effective width can result in excessive supply of paving material to the screw channel, causing the material to overflow beyond the front wall of the screed, which can have a negative impact on the paving quality of the paving layer. Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to maintain the integrity of the paving quality of the paving layer, especially when the effective width of the screed is changed. [Means for solving the problem]

[0005] This object is achieved by a road paver according to claim 1 or a method for operating a road paver according to claim 13.

[0006] According to a first aspect of the present invention, a road paver for producing a paving layer from paving material includes a screed, a lateral distribution device, and a press-scraper device. The screed has at least one base screed. The lateral distribution device is adapted to distribute paving material in a direction transverse to the direction of travel of the road paver in front of the screed. The press-scraper device is arranged behind the lateral distribution device in the direction of travel. The press-scraper device can have a height-adjustable press-scraper blade. The height-adjustable press-scraper blade can be arranged in the area of ​​the base screed.

[0007] The direction of travel may correspond to the direction of travel of the road paver during the laying of the paving material, and is also referred to as the paving direction. The terms direction of travel and paving direction are used specifically as synonyms in this application.

[0008] The height-adjustable press scraper blade can be used to control or limit the amount of paving material in front of the screed, especially the base screed. This allows the force acting on the screed, especially due to the resistance of the paving material to being pushed away, to be controlled or limited. This means that the screed may need to be less rigid. Furthermore, a more uniform laying of the paving material can be ensured. Another advantage is that the paving material can be transported more quickly to the side edge regions of the screed, especially when the paving width is increased by laterally widening the extension screed parts. The height-adjustable press scraper blade also reduces uneven distribution of the paving material.

[0009] 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 a central region in the lateral direction of the road paver. The lateral direction of the road paver may extend perpendicular 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.

[0010] The height-adjustable prescraper blade can extend substantially perpendicular to the direction of travel or longitudinal axis of the road paver. The height-adjustable prescraper blade can extend substantially transversely and vertically to the direction of travel. The front face of the height-adjustable prescraper blade can be substantially perpendicular to the direction of travel.

[0011] The height-adjustable press-scraper blade may be height-movable pneumatically, hydraulically, electrically, and / or mechanically. The press-scraper device may 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 adapted to move the height-adjustable press-scraper blade. The height-adjustable press-scraper blade may be height-movable by remote control.

[0012] The height-adjustable press-scraper blade may be adapted so that its vertical position (plumbing position) is adjustable. The height-adjustable press-scraper blade may be adapted so that its vertical position is adjustable relative to the lateral distribution device. The height-adjustable press-scraper blade may be adapted so that its vertical position is adjustable relative to the screed, in particular the base screed.

[0013] The height-adjustable press-scraper blade may be adapted to be height-movable relative to the screed, in particular the base screed.The height-adjustable press-scraper blade may be adapted to be height-movable relative to the lateral distribution device.

[0014] The height-adjustable press-scraper blade allows the vertical distance between the press-scraper device and the ground to be changed or adjusted. Maintaining the vertical distance between the press-scraper device and the ground minimizes the load on the screed, especially the base screed. Reducing the vertical distance between the press-scraper device and the ground allows for better transport of paving material to the end regions of the screed, especially the extended screed parts of the screed.

[0015] The height-adjustable pre-scraper blade may be adapted to be infinitely / continuously movable. The vertical position of the height-adjustable pre-scraper blade may be infinitely / continuously adjustable.

[0016] The term height adjustable is to be understood in particular in this application to mean that the vertical position is adjustable.

[0017] The height-adjustable press-scraper blade may be movable in height by at least 50 millimeters, preferably at least 100 millimeters, preferably at least 200 millimeters. The height-adjustable press-scraper blade may be movable in height by at least 50 millimeters, preferably at least 100 millimeters, preferably at least 200 millimeters relative to the lateral distribution device. The height-adjustable press-scraper blade may be movable in height by at least 50 millimeters, preferably at least 100 millimeters, preferably at least 200 millimeters relative to the screed, in particular the base screed. The height-adjustable press-scraper blade may be movable in height by at least 50 millimeters, preferably at least 100 millimeters, preferably at least 200 millimeters relative to the ground.

[0018] The width of the prescraper device may be 110 cm to 320 cm, preferably 110 cm to 130 cm, preferably 170 cm to 190 cm, preferably 230 cm to 260 cm, preferably 290 cm to 320 cm. The width is particularly defined as the range in the direction transverse to the direction of travel. The width of the height-adjustable prescraper blade may be 55 cm to 160 cm, preferably 55 cm to 65 cm, preferably 85 cm to 95 cm, preferably 115 cm to 130 cm, preferably 145 cm to 160 cm.

[0019] The width of the height-adjustable press scraper blade may correspond to the width of the screed. The width of the height-adjustable press scraper blade may correspond to the width of the base screed. The width of the height-adjustable press scraper blade may correspond to the combined width of the base screed and the extension screed component. The width of the height-adjustable press scraper blade may correspond to the width of a lateral distribution channel or tunnel of a road paver.

[0020] The road paver may have a longitudinal conveyor device. The longitudinal conveyor device may be arranged ahead of the screed in the direction of travel. The lateral distribution device may be arranged upstream of the screed in the direction of travel. The lateral distribution device may be arranged downstream of the longitudinal conveyor device in the direction of travel. The road paver may have a material hopper that receives the paving material. The material hopper may be arranged upstream of the longitudinal conveyor device in the direction of travel.

[0021] The road paver may have a drive unit. The drive unit may be arranged on the side of the longitudinal conveyor unit. The drive unit may include a left drive unit and a right drive unit. The left side and right side are based on the direction of travel of the road paver. The left drive unit may be arranged on the left side of the longitudinal conveyor unit. The right drive unit may be arranged on the right side of the longitudinal conveyor unit. The drive units, particularly the left and right drive units, may be track assemblies. The drive units, particularly the left and right drive units, may include wheels.

[0022] The height-adjustable press-scraper blade can extend beyond the longitudinal conveyor device in a direction transverse to the direction of travel, in particular to the left and right. The height-adjustable press-scraper blade can extend transverse to the direction of travel to the drive. The height-adjustable press-scraper blade can be arranged rearward of the drive in the direction of travel. The height-adjustable press-scraper blade can extend transverse to the direction of travel from the left end to the right end of the drive. The height-adjustable press-scraper blade can extend transverse to the direction of travel from the outside of the left drive to the outside of the right drive.

[0023] 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 beyond the base screed to the left and right.

[0024] The lateral distribution device may include at least one distribution screw. The lateral 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 substantially transversely to the direction of travel. The left distribution screw and the right distribution screw may be supported on supports in the form of screw supports or center bearing blocks. The lateral distribution device may have further distribution screws.

[0025] The height-adjustable prescraper blade may be movable in height during operation of the road paver. The height-adjustable prescraper blade may be movable in height during a paving run of the road paver. The vertical position of the prescraper blade may be adjustable during operation of the road paver.

[0026] The vertical position of the height-adjustable press scraper blade may be adjustable during operation of the road paver, in particular relative to the lateral distribution device and / or the screed. In particular, the press scraper device may be adapted so that the height-adjustable press scraper blade can be lowered and raised during operation of the road paver, in particular relative to the lateral distribution device and / or the screed.

[0027] The height-adjustable press-scraper blade may be at least indirectly attached to the support of the lateral distribution device. The height-adjustable press-scraper blade may be attached to the support of the lateral distribution device via an intermediate part, for example a support structure. The height-adjustable press-scraper blade may be attached directly to the support of the lateral distribution device. The support of the lateral distribution device and the height-adjustable press-scraper blade may be attached to the same part. The support of the lateral distribution device may be attached to the lateral distribution fixture. The height-adjustable press-scraper blade may also be attached to the lateral distribution fixture.

[0028] The height-adjustable pre-scraper blade may be at least indirectly attached 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 part, for example via a support structure. The height-adjustable pre-scraper blade may be attached directly to the screed, in particular the base screed.

[0029] The lateral distribution device may be movable in height, particularly relative to the screed. The lateral distribution device may be movable in height relative to the ground. The lateral distribution attachment or the support for the lateral distribution device may be attached to the chassis of the road paver via a cylinder. The vertical position of the lateral distribution attachment, the support for the lateral distribution device, the height-adjustable press scraper blade and / or the lateral distribution device may be adjustable via the cylinder. The cylinder may be a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0030] The height-adjustable press-scraper blade may be movable in a height direction relative to the lateral distribution device. The vertical position of the press-scraper blade may be adjustable relative to the lateral distribution device. The adjustment device may be disposed between the height-adjustable press-scraper blade and the lateral distribution device and adapted to move the height-adjustable press-scraper blade in a height direction relative to the lateral distribution device. The adjustment device may include at least one pneumatic cylinder, hydraulic cylinder, or electric cylinder. The adjustment device may include an electric motor. The adjustment device may include a ratchet or a crank.

[0031] The height-adjustable press-scraper blade may be movable in height relative to the screed, in particular the base screed. The vertical position of the press-scraper blade may be adjustable relative to the screed, in particular the base screed. An adjustment device may be arranged between the height-adjustable press-scraper blade and the screed, in particular the base screed, and adapted to move the height-adjustable press-scraper blade in height relative to the screed, in particular the base screed. The adjustment device may comprise at least one pneumatic, hydraulic, or electric cylinder. The adjustment device may comprise an electric motor. The adjustment device may comprise a ratchet or a crank.

[0032] The prescraper device may be arranged substantially, in particular in the direction of travel, between the lateral distribution device and the screed.A height-adjustable prescraper blade may be arranged substantially, in particular in the direction of travel, between the lateral distribution device and the base screed.

[0033] The term substantially should be interpreted in particular such that the areas of the individual components may overlap.

[0034] The center of gravity of the press scraper device may be arranged, in particular in the direction of travel, between the center of gravity of the lateral distribution device and the center of gravity of the screed, in particular the center of gravity of the base screed.The center of gravity of the height-adjustable press scraper blade may be arranged, in particular in the direction of travel, between the center of gravity of the lateral distribution device and the center of gravity of the base screed.

[0035] The paving material can be conveyed from the longitudinal conveyor device to the transverse distributor device in a direction opposite to the direction of travel of the road paver. The paving material can be conveyed under the press scraper device, in particular under the press scraper blade, to the screed, in particular to the base screed.

[0036] The screed can have extension screed parts in addition to the base screed, which can be arranged laterally adjacent to the base screed, in particular on both sides of the base screed, and which can be arranged offset relative to the base screed in the direction of travel.

[0037] The extension screed element or the front end of the extension screed element may be arranged forward of the base screed or the front end of the base screed in the direction of travel. The screed may be a front-mounted screed, also known as a front screed.

[0038] The extension screed element or the front end of the extension screed element may be arranged behind the base screed or the front end of the base screed in the direction of travel. The screed may be a rear-mounted screed, also known as a rear screed.

[0039] The road paver can have a measuring system, which can be arranged between the lateral distribution device in the direction of travel and the screed, in particular the base screed.

[0040] The measuring system may be adapted to measure the amount of paving material ahead of the screed, in particular the base screed, in particular the amount of paving material immediately ahead of the screed or base screed.

[0041] The measuring system may 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 in particular the vertical distance between the top edge of the paving material and the ground. The measuring system may be adapted to detect or measure the top edge of the paving material between the lateral distribution device and the screed, in particular the base screed.

[0042] The measurement system may be adapted to perform measurements continuously and / or at predetermined time intervals.

[0043] The measuring system may have at least one sensor, which may be arranged between the lateral distribution device in the direction of travel and the screed, in particular the base screed, between the press scraper device and the screed, or between the height-adjustable press scraper blade and the base screed.

[0044] 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, in particular a rotary encoder with a mechanical sensing arm. At least one sensor may be an electro-optical sensor. At least one sensor may be a laser distance sensor. At least one sensor may be an infrared distance meter. At least one sensor may be an ultrasonic sensor. At least one sensor may be one or more cameras.

[0045] The road paver may have multiple sensors. The sensors may be distributed transversely to 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 extension screed part, particularly located laterally to the left of the base screed. A third sensor may be located in front of a second extension screed part, particularly located laterally to the right of the base screed.

[0046] The road paver may further comprise one or more distribution screw sensors adapted to measure the vertical position of the lateral distributor, in particular the vertical distance between the ground and the laterally extending rotation axis of the lateral distributor.

[0047] The road paver may also have one or more screed sensors, which may be adapted to measure the vertical position of the screed, in particular the vertical distance between the substrate and the lower end of the base screed.

[0048] The height-adjustable press-scraper blades, in particular the left and second height-adjustable press-scraper blades, can have a protrusion at their lower ends facing the direction of travel. This protrusion can have a triangular cross section, in particular a right-angled triangle, when viewed laterally. The face of the press-scraper blade formed by the hypotenuse of the triangle can face the direction of travel.

[0049] The road paver may have a control unit, which may be configured to adjust the height of the height-adjustable prescraper blade, in particular during operation of the road paver or during a paving run.

[0050] The control unit may be adapted to receive data from the measurement system. The control unit may be adapted to receive data wirelessly from the measurement system. Data transmission between the control unit and the measurement system may take place, for example, via Bluetooth, WLAN (Wi-Fi), etc. Data transmission between the control unit and the measurement system may also take place via a cable.

[0051] The control unit may be configured, in particular in combination with a measuring system, to regulate or control the supply of paving material upstream of the screed. The control unit may be configured, in particular in combination with a measuring system, to keep the supply of paving material ahead of the screed as constant as possible, in particular according to a predetermined target value.

[0052] The control unit, in particular in combination with a measuring system, can be configured for feedback control or control of the height of the paving material between the press scraper device and the screed, in particular the base screed. The control unit, in particular in combination with a measuring system, can be configured to keep the height of the paving material between the press scraper device and the screed, in particular the base screed, as constant as possible, in particular in accordance with a predetermined target value.

[0053] The control unit may be configured to move the height-adjustable press scraper blade in height based on the height of the screed, particularly in combination with measurements from the measurement system. The screed height is specifically the vertical distance between the lower end of the screed, particularly the base screed, and the ground. The control unit may be configured to adjust the vertical position of the height-adjustable press scraper blade based on the height of the screed, particularly in combination with measurements from the measurement system.

[0054] By adjusting the vertical position of the prescraper blade, the amount of paving material ahead of the screed or the height of the paving material between the prescraper device and the screed can be adjusted. Lowering the prescraper blade allows for a smaller height or amount of paving material immediately ahead of the screed, particularly the base screed. Raising the prescraper blade allows for a larger height or amount of paving material immediately ahead of the screed, particularly the base screed.

[0055] The prescraper blade may be rotatable about an axis of rotation during operation of the road paver. In particular, the axis of rotation extends parallel to the direction of travel. The axis of rotation may be centrally located with respect to the lateral direction of the road paver. The height-adjustable prescraper blade may be rotatable about the axis of rotation during operation of the road paver or during a paving run.

[0056] Curves or inclines in the transverse profile of the paving layer result in different amounts of paving material being laid from the left to the right side of the screed. This, in particular, requires different heights and amounts of paving material ahead of the screed (when viewed transversely). This can be taken into account by rotating the height-adjustable press scraper blade.

[0057] The control unit may be configured to rotate the height-adjustable press scraper blade about an axis of rotation, particularly during operation of the road paver or during a paving run.

[0058] The height-adjustable press-scraper blade may be rotatable at an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The control unit may be configured to rotate the height-adjustable press-scraper blade at an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The angle is understood to be a deviation from horizontal, in particular. In particular, when the angle is 0 degrees, the lower end of the height-adjustable press-scraper blade is horizontally aligned.

[0059] The control unit may be configured to adjust or control the rotation of the height-adjustable press scraper blade based on the current (i.e., current) laying conditions, such as curvature and / or lateral tilt. The control unit may be adapted to adjust or control the rotation of the height-adjustable press scraper blade based on the current laying conditions in combination with one or more measurements of the measurement system.

[0060] The height-adjustable press-scraper blade may be a first height-adjustable press-scraper blade. The press-scraper device may further include a second height-adjustable press-scraper blade. The second height-adjustable press-scraper blade may be positioned adjacent to the first height-adjustable press-scraper blade in a direction transverse to the direction of travel. The second height-adjustable press-scraper blade may be movable in height relative to the first height-adjustable press-scraper blade.

[0061] The provision of two or more height-adjustable press-scraper blades may be an alternative solution to accommodate curvature or lateral inclination. However, the provision of two or more height-adjustable press-scraper blades may also be combined with a rotatable height-adjustable press-scraper blade. The two or more height-adjustable press-scraper blades may be rotatable around the same axis of rotation or around different axes of rotation.

[0062] The first and second height-adjustable press-scraper blades may be arranged at the same position as the second height-adjustable press-scraper blade when viewed in the direction of travel. The first height-adjustable press-scraper blade and the second height-adjustable press-scraper blade may be arranged in alignment (in line) with each other, particularly with respect to the direction of travel.

[0063] The control unit may be configured to adjust the height of the first height-adjustable prescraper blade, in particular during operation or paving travel of the road paver. The control unit may be configured to adjust the height of the second height-adjustable prescraper blade, in particular during operation or paving travel of the road paver.

[0064] The first and second height-adjustable pre-scraper blades may be vertically movable relative to each other between 0 and 150 mm, preferably between 0 and 50 mm, preferably between 0 and 100 mm. The control unit may be configured to vertically move the first and second height-adjustable pre-scraper blades relative to each other between 0 and 150 mm, preferably between 0 and 100 mm, preferably between 0 and 50 mm.

[0065] In the first position, the first height-adjustable press-scraper blade can be positioned higher than the second height-adjustable press-scraper blade, in the second position, the first height-adjustable press-scraper blade can be positioned at the same height as the second height-adjustable press-scraper blade, and in the third position, the first height-adjustable press-scraper blade can be positioned lower than the second height-adjustable press-scraper blade.

[0066] The height-adjustable pre-scraper blades, in particular the first and second height-adjustable pre-scraper blades, can be adapted to be infinitely adjustable.The vertical position of the height-adjustable pre-scraper blades, in particular the first and second height-adjustable pre-scraper blades, can be infinitely adjustable.

[0067] The control unit may be adapted to infinitely move the height-adjustable press-scraper blade in a height direction. The control unit may be adapted to infinitely move the first and second height-adjustable press-scraper blades in a height direction. The control unit may be adapted to infinitely rotate the height-adjustable press-scraper blade.

[0068] The first and second height-adjustable press-scraper blades may each be rotatable at an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The control unit may be configured to rotate the height-adjustable press-scraper blades at an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The control unit may be configured to rotate the first height-adjustable press-scraper blade, particularly independently of the second height-adjustable press-scraper blade, at an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The control unit may be configured to rotate the second height-adjustable press-scraper blade, particularly independently of the first height-adjustable press-scraper blade, at an angle between minus 10 degrees and plus 10 degrees, preferably between minus 3 degrees and plus 3 degrees. The control unit may be configured to rotate the first height-adjustable press-scraper blade together with the second height-adjustable press-scraper blade.

[0069] The angle is to be understood in particular as a deviation from the horizontal, in particular when the angle is 0 degrees the lower end of the height-adjustable pre-scraper blade is aligned horizontally.

[0070] Alternatively or in addition to height adjustment, the first and second press-scraper blades may be adapted to be rotatable about axes parallel to the direction of travel. The first press-scraper blade may be adapted to be rotatable at a first angle about a first axis parallel to the direction of travel. The second press-scraper blade may be adapted to be rotatable at a second angle about a second axis parallel to the direction of travel. The control unit may be adapted to rotate the first and second press-scraper blades by the same angle. The control unit may be adapted to rotate the first and second press-scraper blades by different angles, particularly in different directions. For example, the control unit may be adapted to rotate the first press-scraper blade at a positive angle and the second press-scraper blade at a negative angle, or vice versa.

[0071] The control unit may be configured to adjust or control the rotation of the height-adjustable press scraper blade based on the current laying conditions, such as curvature and / or lateral tilt. The control unit may be adapted to adjust or control the rotation of the height-adjustable press scraper blade based on the current laying conditions in combination with one or more measurements of the measurement system.

[0072] The press-scraper device can also have an additional plate. The additional plate can be adapted to be adjustable, in particular height-adjustable. The additional plate can be adapted to be adjustable in the direction of travel, in the opposite direction, or horizontally. The additional plate can be arranged between the height-adjustable press-scraper blade in the direction of travel and the lateral distribution device, in particular the central bearing block of the lateral distribution device. The additional plate can have a positive effect on the uneven distribution of the paving material in the area of ​​the central bearing block. The additional plate can reduce the space behind the central bearing block, in particular by adjusting the additional plate in the direction of travel or horizontally. By adjusting the additional plate, the horizontal distance between the additional plate and the central bearing block can be adjusted. The additional plate can prevent or reduce cooling of the paving material in the area behind the central bearing block. The additional plate can be made of metal and can have elongated holes. The elongated holes can extend in the direction of travel or horizontally.

[0073] According to a second aspect of the present invention, a method for operating a road paver comprises conveying paving material in front of a screed of the road paver in a direction opposite to the direction of travel of the road paver, and distributing the paving material transversely to the direction of travel of the road paver by a lateral distribution device in front of the screed. The road paver has a pre-scraper blade, which is arranged behind the lateral distribution device in the direction of travel and transversely to the direction of travel in the region of the base screed of the screed. The pre-scraper blade can be moved in height and / or rotated during operation of the road paver, in particular during a paving run of the road paver. The road paver can be adapted according to the first aspect of the present invention.

[0074] The prescraper blade may be adapted in the same manner as the height-adjustable prescraper blade described in relation to the first aspect of the invention. The road paver may have a prescraper device including, in particular, a prescraper blade. The prescraper device may be adapted in the same manner as the prescraper device described in relation to the first aspect of the invention.

[0075] The height of the prescraper blade may be adjusted automatically by a control unit. The prescraper blade may be moved in height by operator input. The control unit may be adapted similarly to the control unit described in relation to the first aspect of the invention.

[0076] The method may further include measuring the height of the paving material in the region between the lateral distribution device and the screed, particularly in the region between the prescraper blade and the screed, and adjusting the height or vertical position of the prescraper blade based on the measured height of the paving material.

[0077] The height or vertical position of the press scraper blade may be adjusted based on the current effective width of the screed or changes in the effective width of the screed.

[0078] The measurement of the height of the paving material may be performed by a measurement system, which may be adapted in the same way as the measurement system described in relation to the first aspect of the invention.

[0079] Alternatively or in addition to adjusting the height of the prescraper blade, the method may include rotating the prescraper blade about an axis parallel to the direction of travel. The rotation of the prescraper blade may be based on the measured height of the paving material. The rotation of the prescraper blade may be based on the current effective screed width or a change in the effective screed width.

[0080] The method can include adjusting a height or vertical position of the first and second prescraper blades.The method can include adjusting a rotation of the first and second prescraper blades.

[0081] A road paver according to the first aspect of the invention may be used 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 carried out using a road paver according to the first aspect of the invention.

[0082] As used in the specification describing the various embodiments and in the appended claims, the singular forms "a," "the," and "the" are to be understood as including the plural forms and vice versa, unless the context clearly dictates otherwise.

[0083] The terms "first," "second," "third," and "fourth" should be understood to merely identify particular elements or components and do not necessarily refer to a particular order or arrangement of said elements or components. 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 explanation of the drawings]

[0084] [Figure 1] 1 is a side view of a road paver according to the present invention; FIG. [Figure 2] 1 is a perspective view of a road paver according to the present invention; FIG. [Figure 3] 1 is a top view of a longitudinal conveyor device, a lateral distribution device and a screed of a road paver according to the present invention; FIG. [Figure 4] FIG. 4 is a top view of an alternative embodiment of the screed according to the invention shown in FIG. 3; [Figure 5] 1 is a cross-sectional side view of a portion of a road paver according to the present invention; [Figure 6] 1 is a perspective view of a press scraper device, a lateral distribution device, and a deflector plate device of a road paver according to the present invention; FIG. [Figure 7] 7 is a perspective view of an alternative embodiment of the deflector plate arrangement shown in FIG. 6 according to the present invention. [Figure 8] 7 is a perspective view of a further alternative embodiment of the press scraper device shown in FIG. 6 according to the present invention; FIG. [Figure 9] 1 is a cross-sectional side view of part of a road paver according to the invention in a first position; [Figure 10] 3 is a cross-sectional side view of part of a road paver according to the invention in a second position; FIG. [Figure 11] 4 is a cross-sectional side view of part of a road paver according to the invention in a third position; FIG. [Figure 12] 1 is a side perspective view of a portion of a road paver according to the present invention; FIG. [Figure 13] 13 is a perspective view from below of the portion of the road paver shown in FIG. 12 according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0085] Advantageous embodiments of the invention will now be explained in more detail with reference to the accompanying drawings.

[0086] 1 and 2 are a side view and a perspective top view of a road paver 1 according to the present invention for producing a paving layer 2 on a ground surface 3. The road paver 1 has a material hopper 4 in front of the paving direction 100, and a longitudinal conveyor device 5 conveys paving material 6 received in the material hopper 4 from the material hopper 4 to a screed 7 of the road paver 1 in the direction opposite to the paving direction 100 of the road paver 1. The longitudinal conveyor device 5 is arranged within the chassis 8 of the road paver 1 and first conveys the paving material 6 to a lateral distributor 9 arranged in front of the screed 7 in the paving direction 100. The lateral distributor 9 is adapted to distribute the paving material 6 in front of the screed 7 along a lateral direction 200 transverse to the paving direction 100.

[0087] The extent of the paving layer 2 in the lateral direction 200 is referred to as the effective width 210 or paving width 210. The screed 7 has a screed base 10 and laterally (laterally) extendable extension screed elements 11. The effective width 210 of the paving layer 2 can be changed and adjusted by extending the extension screed elements 11 laterally.

[0088] The road paver 1 also has a control unit 37. The control unit 37 may be operated by user input or may operate 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 (displace) the height-adjustable pre-scraper blade 30.

[0089] 3 is a schematic top view of the screed 7 and longitudinal conveyor device 5 of a road paver 1 according to the invention. The longitudinal conveyor device 5 comprises a conveyor belt in the form of a scraper belt 12. The scraper belt 12 comprises a left scraper belt portion 13 and a right scraper belt portion 14. The terms left and right are to be understood as viewed in the direction of paving travel 100.

[0090] The paving material 6 dropped in front of the screed base body 10 of the screed 7 by the scraper belt 12 is distributed along the front face 14 of the screed base body 10 by the lateral distribution device 9 as shown by arrow 220.

[0091] The rear wall 15 of the chassis 8 of the road paver 1 together with the front face 14 of the screed base body 10 form a lateral distribution channel 16 , also called a screw chamber, for the lateral distribution device 9 .

[0092] The extension screed parts 11 of the screed 7 can be extended laterally 200 (sideways) relative to the base screed body 10, which can widen the screed 7 and change its effective width 210. The lateral distribution channels 16 can be further extended laterally (sideways) in response to the widening of the screed 7.

[0093] The paving material 6 is conveyed from the scraper belt 12 of the longitudinal conveyor device 5 to a lateral distributor 9 arranged in front of the screed 7. The lateral distributor 9 is adapted to distribute the paving material 6 in front of the screed 7 in a lateral distribution channel 16 in a lateral direction 200 transverse to the paving advance direction 100.

[0094] The lateral distribution device 9 is mounted to the rear end of the chassis 8 of the road paver 1. The lateral distribution device 9 includes a left distribution screw 17 and a right distribution screw 18. The left distribution screw 17 and the right distribution screw 18 are supported on supports 19 in the form of screw supports 19. The screw supports 19 are sometimes referred to as central bearing blocks 19.

[0095] The housing formed by the screw support 19 contains a worm drive (not shown) that powers the two distribution screws 17, 18. The lateral distribution device 9 includes shafts 20. The shafts 20 may be two individual shafts 20 (a left shaft 21 and a right shaft 22) or a single shaft 20 shared by the two distribution screws 17, 18. The left 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 support 19, is supported in a screw bearing 23.

[0096] The prescraper device 24 according to the invention is not shown in Figure 3. The position of the prescraper device 24 is indicated by the reference numeral 24.

[0097] In the embodiment shown in Figure 3, the front end 14 of the base screed body 10 is located forward of the front end 25 of the extension screed part 11 in the direction of travel 100. This form of screed 7 is referred to as a rear-mounted screed or rear screed.

[0098] Figure 4 is a top view of an alternative embodiment of the screed 7 of a road paver 1 according to the invention. Compared to the embodiment of Figure 3, the front end 25 of the extension screed part 11 is arranged forward of the front end 14 of the base screed 10 in the direction of travel 100. This form of screed 7 is called a front-mounted screed or front screed.

[0099] The extension screed element 11 is in the extended position in the example shown in Figure 4. The lateral distribution device 9 and the press scraper device 24 according to the invention are not shown in Figure 4. The position of the lateral distribution device 9 is shown in the lateral distribution channel 16.

[0100] The road paver 1 may have a deflector plate device 26, which is arranged between the longitudinal conveyor device 5 and the transverse distribution device 9 in the direction of travel 100. The deflector plate device 26 may have height-adjustable deflector plates.

[0101] Figure 5 shows a side cross-section of part of a road paver 1 according to the invention. The screw support 19 of the lateral distribution device 9 is mounted on the chassis 8 so as to be height-adjustable via a cylinder 27. In Figure 5, the paving material height 28 of the paving material 6 is shown by a dashed line.

[0102] The press scraper device 24 is attached to the chassis 8 or the screw support 19 via a bracket 29. Alternatively, the bracket 29 may be attached to the screed 7. The press scraper device 24 has a press scraper blade 30. The press scraper blade 30 is adapted to move up and down in a vertical direction 300 relative to the bracket 29.

[0103] 6 is a perspective view showing the prescraper device 24, the lateral distribution device 9 and the deflector plate device 26 of the road paver 1 according to the present invention. The deflector plate device 26 is optional.

[0104] The prescraper device 24 has a support structure 31. The support structure 31 is attached to the screw support 19. A prescraper blade 30 is attached to the support structure 31 via an adjustment device 32 in the form of a hydraulic or pneumatic cylinder. The adjustment device 32 can be used to adjust the vertical position of the prescraper blade 30.

[0105] 7 and 8 are perspective views of an alternative embodiment of the press scraper device 24 shown in FIG.

[0106] The press-scraper device 24 shown in Fig. 7 has a press-scraper blade 30, which is adapted to be rotatable by an angle 400 about an axis parallel to the direction of travel 100. The rotation of the press-scraper blade 30 can be realized by means of an adjustment device 32. In particular, the adjustment device 32 has a left-hand actuating element 33 and a right-hand actuating element 34, which can be controlled independently of one another, in particular by a control unit 37.

[0107] The press-scraper device 24 shown in FIG. 8 has a first height-adjustable press-scraper blade 35 in the form of a left press-scraper blade 35 and a second height-adjustable press-scraper blade 36 in the form of a right press-scraper blade 36. The left and right press-scraper blades 35, 36 can be moved in height independently of each other. As a result, a vertical offset 310 can be realized between the left and right press-scraper blades 35, 36. In particular, the adjustment device 32 has a left operating element 33 and a right operating element 34, which can be controlled independently of each other, in particular by a control unit 37. The vertical offset 310 between the left and right press-scraper blades 35, 36 is realized by the independent control of the left and right operating elements 33, 34.

[0108] Alternatively or in addition to height adjustment, the left and right press-scraper blades 35, 36 may be adapted to be rotatable about axes extending parallel to the direction of travel 100. The left and right press-scraper blades 35, 36 may be adapted to be rotatable at a first angle 410 about a first axis parallel to the direction of travel 100. The right press-scraper blade 36 may be adapted to be rotatable at a second angle 420 about a second axis parallel to the direction of travel 100. Rotation of the left and right press-scraper blades 35 may be realized by the left operating element 33. Rotation of the right press-scraper blade 36 may be realized by the right operating element 34. The adjustment device 32 may further have operating elements, in particular a second left operating element and a second right operating element, which are adapted to rotate the left and right press-scraper blades, respectively. The control unit may be adapted to rotate the left and right press-scraper blades 35, 36 by the same angle. The control unit may be adapted to rotate the left and right press-scraper blades 35, 36 by different angles, in particular in different directions.

[0109] 9 to 11 are cross-sectional side views of a portion of a road paver 1 according to the present invention. The road paver 1 has a measurement system (without reference numerals). The measurement system includes a sensor 38. The sensor 38 is arranged between the lateral distribution device 9 and the screed 7, in particular between the height-adjustable press scraper blade 30 and the base screed 10. The sensor 38 is arranged facing downwards 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 paving material height 28 below the sensor 38 can be determined by the sensor 38 and / or the control unit 37. The road paver 1 may have multiple sensors 38.

[0110] The distribution screw height 320 of the distribution screw 17 is defined as the vertical distance between the distribution screw rotation axis 39 extending in the transverse direction 200 and the ground 3. The paving material height 28 between the height-adjustable press scraper blade 30 and the base screed 10 is designated by reference number 330 and is defined as the vertical distance between the top edge of the paving material 6 and the ground 3. The screed height 340 is defined as the vertical distance between the screed 7, in particular the base screed 10, and the ground 3.

[0111] In FIG. 9 , the lateral distributor 9 is positioned at a first position above the ground surface 3 at a first distribution screw height 320. The screed 7 is positioned at a first position above the substrate 3 at a first screed height 340. The required amount of paving material 6 upstream of the screed 7 or a target value for the paving material height 330 upstream of the screed 7 can be determined by the control unit 37, for example, based on the distribution screw height 320 and the screed height 340. Alternatively, the target value for the paving material height 330 upstream of the screed 7 can be generated 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. The vertical position of the height-adjustable press scraper blade 30 is then adjusted based on any possible difference between the target value and the measured value.

[0112] In Figure 10, the lateral distribution device 9 is positioned in a first position (as shown in Figure 9). The screed 7 is positioned in a second position at a second screed height 340 above the base 3. The screed height 340 in Figure 10 is greater (higher) than the screed height 340 in Figure 9. Compared to the first position of the pre-scraper blade 30 shown in Figure 9, the height-adjustable pre-scraper blade 30 has been moved vertically upward to a second position where the screed height 330 in front of the screed 7 is greater (higher). Because the paving material height 330 in front of the screed 7 is greater (higher), more paving material 6 is available in front of the screed 7, as required for the higher screed height 340.

[0113] In Figure 11, the screed 7 is positioned in a second position (shown in Figure 10) at a second screed height 340 above the ground surface 3. The lateral distributor 9 is positioned in a second position at a second distribution screw height 320 above the ground surface 3. The distribution screw height 320 in Figure 11 is higher than the distribution screw height 320 in Figures 9 and 10. Compared to the second position of the press scraper blade 30 shown in Figure 10, the height-adjustable press scraper blade 30 has been moved vertically upwards and is now in a third position in which the screed height 330 in front of the screed 7 is higher.

[0114] FIG. 12 is a side cross-sectional view of part of a road paver according to the present invention. FIG. 13 is a perspective view from below of the part shown in FIG. 12. Unlike FIG. 13, the left distribution screw 17 and the right distribution screw 18 are not shown in FIG. 12. The central bearing block 19 or screw support 19 of the lateral distribution device 9 is arranged between the deflector plate device 26 and the press-scraper blade 30 in the direction of travel 100. An additional plate 40 is arranged in front of the press-scraper blade 30. The additional plate 40 is arranged between the press-scraper blade 30 and the central bearing block 19. When viewed from the lateral direction 200, the additional plate 40 is arranged in the area of ​​the central bearing block 19. The surface of the additional plate 40 facing the central bearing block 19 can be adjusted so that it is approximately vertical. 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 elongated holes 41 in the additional plate 40. The slots 41 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, in particular the horizontal distance, can be adjusted. The additional plate 40 is attached to the press scraper blade 30 by means of fastening means 42, for example screws and nuts. The fastening means 42 extend through the slots 41 in the additional plate 40. The position of the fastening means 42 in the slots 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), a screed (7) including at least one base screed (10); a lateral distribution device (9) adapted to distribute the paving material (6) in front of the screed (7) transversely to the direction of travel (100) of the road paver (1); a press-scraper device (24) arranged behind the transverse distributor (9) in the direction of travel (100); Including, 1. A road paver (1), characterized in that the press scraper device (24) has a height-adjustable press scraper blade (30) arranged in the area of ​​the base screed (10).

2. 2. The road paver according to claim 1, characterized in that the height-adjustable prescraper blade (30) is movable in height during operation of the road paver (1), in particular during a paving run of the road paver (1).

3. 3. Road paver according to claim 1 or 2, characterized in that the height-adjustable prescraper blade (30) is at least indirectly attached to a support (19) of the lateral distribution device (9).

4. 3. A road paver according to claim 1 or 2, characterized in that the height-adjustable press scraper blade (30) is at least indirectly attached to the screed (7), in particular to the base screed (10).

5. 5. Road paver according to any one of claims 1 to 4, characterized in that the height-adjustable prescraper blade (30) is height-movable relative to the lateral distribution device (9).

6. 6. A road paver according to any one of claims 1 to 5, characterized in that the height-adjustable press scraper blade (30) is movable in height relative to the screed (7), in particular relative to the base screed (10).

7. 7. A road paver according to any one of claims 1 to 6, characterized in that the prescraper device (24) is arranged substantially between the lateral distribution device (9) and the screed (7).

8. 8. A road paver according to claim 1, wherein the screed (7) has an extension screed part (11) arranged laterally adjacent to the base screed (10), the front end (25) of the extension screed part (11) being arranged forward of the front end (14) of the base screed (10) in the direction of travel (100).

9. 9. The road paver (1) according to any one of claims 1 to 8, characterized in that the road paver (1) has a measuring system, which is adapted to measure the height of the paving material (6) between the lateral distribution device (9) and the screed (7).

10. 10. The road paver (1) according to any one of claims 1 to 9, characterized in that the road paver (1) has a control unit (37), which is configured to adjust the height of the height-adjustable pre-scraper blade (30).

11. 11. A road paver according to any one of claims 1 to 10, characterized in that the height-adjustable prescraper blade (30) is rotatable about an axis of rotation during operation of the road paver (1), in particular during a paving run of the road paver (1), the axis of rotation extending parallel to the direction of travel (100).

12. the height-adjustable press-scraper blade (30) is a first height-adjustable press-scraper blade (35), and the press-scraper device (24) further comprises a second height-adjustable press-scraper blade (36); the second height-adjustable pre-scraper blade (36) is disposed adjacent to the first height-adjustable pre-scraper blade (35) in a direction transverse to the direction of travel (100); 12. A road paver according to any one of claims 1 to 11, characterized in that the second height-adjustable prescraper blade (36) is adapted to be movable in height relative to the first height-adjustable prescraper blade (35).

13. A method for operating a road paver (1), in particular a road paver (1) according to any one of claims 1 to 12, comprising: - conveying paving material (6) in front of the screed (7) of said road paver (1) in a direction opposite to the direction of travel (100) of said road paver (1); - distributing the paving material (6) transversely to the direction of travel (100) of the road paver (1) by a transverse distributor (9) in front of the screed (7); Including, The road paver (1) has a press scraper blade (30) arranged behind the lateral distribution device (9) in the direction of travel (100), 10. A method according to claim 9, wherein the prescraper blade (30) is moved in height during operation of the road paver (1), in particular during a paving run of the road paver (1).

14. 14. A method for operating a road paver according to claim 13, characterized in that the prescraper blade (30) is moved in height automatically by a control unit (37) and / or by operator input.

15. measuring the height of the paving material (6) in the area between the lateral distribution device (9) and the screed (7); adjusting the vertical position of the prescraper blade (30) based on the measured height of the paving material (6); 15. A method of operating a road paver according to claim 13 or 14, further comprising:

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