Road paver

Abstract

The utility model relates to a road paver (1) which is used for generating a paving layer (2) by paving materials (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).

Description

Technical Field

[0001] This utility model relates to a road paver. Background Technology

[0002] Road pavers are provided for generating paving layers from paving materials (such as asphalt), and road pavers typically include a chassis and working mechanisms mounted on the chassis, such as material hoppers, screeds, longitudinal conveyors, and transverse distribution devices.

[0003] A screed typically consists of a base screed and laterally adjacent extension screed sections. The extension screed sections can be used to change and adjust the width of the screed and the width of the paving layer (also known as the working width). Adjustable-height pre-scraper blades can be positioned in front of the extension screed sections to control the amount of paving material in front of them. This reduces the force exerted on the extension screed sections by the displacement resistance of the paving material. Such an arrangement of pre-scraper blades is known from EP 2169117 B1. However, adjustable-height pre-scraper blades located in front of the base screed are not known in the prior art. Rapidly changing the working width of the screed may lead to overfilling of the screw channel and overflow of paving material from the front wall of the screed, which could negatively impact the paving quality of the paving layer. Utility Model Content

[0004] The purpose of this invention (especially when the working width of the screed changes) is to ensure a constant paving quality for the paving layer. This purpose is achieved by a road paver according to this invention.

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

[0006] The direction of travel can correspond to the direction of travel of a road paver during the paving of paving materials, and is also referred to as the paving direction. In this application, the terms "direction of travel" and "paving direction" may be used specifically as synonyms.

[0007] Adjustable-height pre-scraper blades can be used to control or limit the amount of paving material in front of the screed (especially the base screed). This allows for the control or limitation of forces acting on the screed (particularly those caused by the displacement resistance of the paving material). This means the screed may require less rigidity. Furthermore, it ensures a more uniform distribution of the paving material. Another advantage is that as the paving width increases, especially by extending the screed laterally, the paving material can be transported more quickly to the side edges of the screed. Adjustable-height pre-scraper blades can also reduce material segregation in the paving material.

[0008] The height-adjustable pre-scraper blade can be positioned in the central area of ​​the road paver. This central area may include the longitudinal axis, specifically the central longitudinal axis of the road paver. The height-adjustable pre-scraper blade can be positioned within the area of ​​the central longitudinal axis of the road paver. The height-adjustable pre-scraper blade can also be positioned within the central area relative to the paver's lateral direction. The lateral direction of the road paver can extend orthogonally to the paver's direction of travel. The longitudinal axis of the paver can extend parallel to the direction of travel. The longitudinal axis of the road paver can extend through the paver's center of gravity.

[0009] The height-adjustable pre-scraper blade can extend substantially perpendicular to the road paver's direction of travel or longitudinal axis. The height-adjustable pre-scraper blade can also extend substantially transversely to the direction of travel and vertically. The front side of the height-adjustable pre-scraper blade can 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 may have at least one cylinder, at least one hydraulic cylinder, at least one electric motor, and / or at least one ratchet or crank, which is particularly suitable for moving the height-adjustable pre-scraper blade in height. The height-adjustable pre-scraper blade can be moved in height remotely.

[0011] The height-adjustable pre-scraper blade can be adapted to be adjustable in its vertical position. The height-adjustable pre-scraper blade can be adapted to be adjustable in its vertical position relative to the lateral dispensing device. The height-adjustable pre-scraper blade can be adapted to be adjustable in its vertical position relative to the ironing plate (particularly the base ironing plate).

[0012] The height-adjustable pre-scraper blade can be adapted to move vertically. The height-adjustable pre-scraper blade can be adapted to move vertically relative to the ironing board (especially the base ironing board). The height-adjustable pre-scraper blade can be adapted to move vertically relative to the transverse dispensing device.

[0013] Adjustable height pre-scraper blades allow for alteration or adjustment of the vertical distance between the pre-scraper assembly and the ground. By maintaining this vertical distance, the load on the screed (especially 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 sections of the screed.

[0014] The height-adjustable pre-scraper blade is suitable for stepless / continuous movement. The vertical position of the height-adjustable pre-scraper blade can be adjusted steplessly / continuously.

[0015] In this application, the term "height adjustable" should be specifically understood to mean 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, and more preferably at least 200 mm. The height-adjustable pre-scraper blade is movable in height relative to the lateral distribution device by at least 50 mm, preferably at least 100 mm, and more preferably at least 200 mm. The height-adjustable pre-scraper blade is movable in height relative to the screed (particularly the base screed) by at least 50 mm, preferably at least 100 mm, and more 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, and more 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, more preferably between 170 cm and 190 cm, more preferably between 230 cm and 260 cm, and more preferably between 290 cm and 320 cm. This width is specifically defined as the extension laterally 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, more preferably between 85 cm and 95 cm, more preferably between 115 cm and 130 cm, and more preferably between 145 cm and 160 cm.

[0018] The width of the adjustable-height pre-screw can correspond to the width of the screed. The width of the adjustable-height pre-screw can correspond to the width of the base screed. The width of the adjustable-height pre-screw can correspond to the combined width of the base screed and the extension section. The width of the adjustable-height pre-screw can correspond to the width of the lateral distribution channel or pipe of the road paver.

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

[0020] A road paver may have driving gears. These driving gears may be arranged laterally to the longitudinal conveyor. The driving gears 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 on the left side of the longitudinal conveyor. The right driving gear may be arranged laterally on the right side of the longitudinal conveyor. The driving gears (specifically the left and right driving gears) may be track assemblies. The driving gears (specifically the left and right driving gears) may include wheels.

[0021] The adjustable-height pre-scraper blade can extend laterally in the direction of travel, particularly to the left and right, beyond the longitudinal conveying device. The adjustable-height pre-scraper blade can extend laterally in the direction of travel into the drive gear. The adjustable-height pre-scraper blade can be positioned behind the drive gear in the direction of travel. The adjustable-height pre-scraper blade can extend laterally in the direction of travel from the left end to the right end of the drive gear. The adjustable-height pre-scraper blade can extend laterally in the direction of travel from the outside of the left drive gear to the outside of the right drive gear.

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

[0023] 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. Both the left and right distribution screws extend generally laterally to the direction of travel. The left and right distribution screws may be supported by a suspension (in the form of a screw suspension or a center bearing block). The lateral distribution device may have further distribution screws.

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

[0025] The vertical position of the height-adjustable pre-scraper blade can be adjusted during road paver operation, particularly relative to the lateral distribution device and / or the screed. Specifically, the pre-scraper device can be adjusted so that the height-adjustable pre-scraper blade can be lowered and raised during road paver operation, especially relative to the lateral distribution device and / or the screed.

[0026] The height-adjustable pre-scraper blade can be attached, at least indirectly, to the suspension of the lateral distribution device. The height-adjustable pre-scraper blade can be attached to the suspension of the lateral distribution device via an intermediate component (e.g., a support structure). The height-adjustable pre-scraper blade can be directly attached to the suspension of the lateral distribution device. The suspension of the lateral distribution device and the height-adjustable pre-scraper blade can be attached to the same component. The suspension of the lateral distribution device can be attached to the lateral distribution fixing device. The height-adjustable pre-scraper blade can also be attached to the lateral distribution fixing device.

[0027] Adjustable-height pre-scraper blades can be attached to the ironing board, particularly the base ironing board, at least indirectly. Adjustable-height pre-scraper blades can also be attached to the ironing board, particularly the base ironing board, via an intermediate component (e.g., a support structure). Adjustable-height pre-scraper blades can also be attached directly to the ironing board, particularly the base ironing board.

[0028] The lateral distribution device can be moved vertically (particularly relative to the screed). The lateral distribution device can also be moved vertically relative to the ground. The lateral distribution fixing device or its suspension can be attached to the road paver chassis via cylinders. The vertical position of the lateral distribution fixing device, the lateral distribution device suspension, the height-adjustable pre-scraper blade, and / or the lateral distribution device can be adjusted via cylinders. The cylinders can be pneumatic, hydraulic, or electric.

[0029] The height-adjustable pre-scraper blade can be moved vertically relative to the lateral distribution device. The vertical position of the pre-scraper blade is adjustable relative to the lateral distribution device. An adjusting device disposed between the height-adjustable pre-scraper blade and the lateral distribution device is adapted to move the height-adjustable pre-scraper blade relative to the lateral distribution device. The adjusting device may have at least one pneumatic, hydraulic, or electric cylinder. The adjusting device may have an electric motor. The adjusting device may have a ratchet or a crank.

[0030] The height-adjustable pre-scraper blade can be moved vertically relative to the ironing plate (especially the base ironing plate). The vertical position of the pre-scraper blade can be adjusted relative to the ironing plate (especially the base ironing plate). An adjusting assembly arranged between the height-adjustable pre-scraper blade and the ironing plate (especially the base ironing plate) is adapted to move the height-adjustable pre-scraper blade relative to the ironing plate (especially the base ironing plate). The adjusting device can have at least one pneumatic, hydraulic, or electric cylinder. The adjusting device can have an electric motor. The adjusting device can have a ratchet or crank.

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

[0032] The term "basically" should be specifically interpreted to mean that the areas of the various components may also overlap. The center of gravity of the pre-scraper device may (particularly in the direction of travel) be arranged between the center of gravity of the lateral distribution device and the center of gravity of the screed (particularly the center of gravity of the base screed). The center of gravity of the height-adjustable pre-scraper blade may (particularly in the direction of travel) be arranged between the center of gravity of the lateral distribution assembly and the center of gravity of the base screed.

[0033] The paving material can be transported from the longitudinal conveyor to the transverse distribution unit in the opposite direction to the travel direction of the road paver. The paving material can also be transported under the pre-scraper assembly (especially the pre-scraper blades) to the screed (especially the base screed).

[0034] In addition to the base screed, the screed may also have an extended screed portion. The extended screed portion may be arranged laterally next to the base screed, particularly on both sides of the base screed. The extended screed portion may be arranged offset from the base screed in the direction of travel.

[0035] The extended ironing plate portion or the front edge of the extended ironing plate portion may be arranged in front of the base ironing plate or in front of the front edge of the base ironing plate along the direction of travel. The ironing plate may be a front-mounted ironing plate, also known as a front ironing plate.

[0036] The extended ironing plate portion or the front edge of the extended ironing plate portion may be arranged behind the base ironing plate or behind the front edge of the base ironing plate along the direction of travel. The ironing plate may be a rear-mounted ironing plate, also known as a rear ironing plate.

[0037] The paver may be equipped with a measuring system. This measuring system can be arranged along the direction of travel between the lateral distribution device and the screed (especially the base screed).

[0038] The measuring system is suitable for measuring the amount of paving material in front of the screed (especially the base screed). This amount of paving material specifically refers to the amount of paving material directly in front of the screed or base screed.

[0039] The measuring system is suitable for measuring 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 is suitable for detecting or measuring the upper edge of the paving material between the lateral distribution device and the screed (particularly the base screed).

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

[0041] The measuring system may have at least one sensor. This at least one sensor may be arranged along the direction of travel between the lateral distribution device and the ironing plate (particularly the base ironing plate). At least one sensor may be arranged between the pre-scraper device and the ironing plate. At least one sensor may be arranged between the height-adjustable pre-scraper blade and the base ironing plate.

[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 with a mechanical sensing 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 can be distributed along the direction of travel. The first sensor can be positioned in front of the base screed. The second sensor can be positioned in front of a first extended screed section, which is specifically positioned on the left side of the base screed in the lateral direction. The third sensor can be positioned in front of a second extended screed section, which is specifically positioned on the right side of the base screed in the lateral direction.

[0044] Road pavers may also be equipped with one or more distribution auger sensors. These sensors are adapted to determine the vertical position of the lateral distribution device, particularly the vertical distance between the ground and the axis of rotation of the lateral distribution device extending in the lateral direction.

[0045] Road pavers may also have one or more screed sensors. These sensors can be adapted to determine the vertical position of the screed, particularly the vertical distance between the ground and the lower edge of the base screed.

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

[0047] Road pavers may have a control unit. This control unit can be configured to adjust the height of the adjustable-height pre-scraper blades, particularly during the operation of the road paver or during paving operations.

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

[0049] The control unit can be configured, particularly in conjunction with a measurement system, to regulate or control the feed of the paving material upstream of the screed. The control unit can also be configured, particularly in conjunction with a measurement system, to keep the feed of the paving material in front of the screed as constant as possible (particularly according to a predetermined target value).

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

[0051] The control unit can be configured to move an adjustable-height pre-scraper blade vertically based on the ironing board height, and in particular, in conjunction with measurements from a measuring system. The ironing board height is specifically the vertical distance between the ironing board (particularly the lower edge of the base ironing board) and the ground. The control unit can be configured to adjust the vertical position of the adjustable-height pre-scraper blade based on the ironing board height, and in particular, in conjunction with measurements from a measuring system.

[0052] By adjusting the vertical position of the pre-scraper blades, the amount of paving material in front of the screed or the height of the paving material between the pre-scraper assembly and the screed can be affected. Lowering the pre-scraper blades 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-scraper blades allows a greater height or more 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 blades can rotate around the axis of rotation. Specifically, the axis of rotation extends parallel to the direction of travel. The axis of rotation can be centrally located relative to the lateral direction of the road paver. The height-adjustable pre-scraper blades can rotate around the axis of rotation during the operation of the road paver or during paving operations.

[0054] At bends or inclines in the paving profile, different amounts of paving material are laid from left to right of the screed. Specifically, this requires different heights or amounts of paving material (viewed laterally) in front of the screed. This can be achieved by rotating an adjustable-height pre-scraper blade.

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

[0056] The height-adjustable pre-scraper blade can rotate 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 between -10 degrees and +10 degrees, preferably between -3 degrees and +3 degrees. This angle should be specifically understood as a deviation from the horizontal line. Specifically, at 0 degrees, the lower edge of the height-adjustable pre-scraper blade is horizontally aligned.

[0057] The control unit can be configured to adjust or control the rotation of the adjustable-height pre-scraper blade based on the current installation conditions (e.g., turning and / or lateral tilting). The control unit can be adapted to adjust or control the rotation of the adjustable-height pre-scraper blade based on the current installation conditions in conjunction with one or more measurements from a measuring system.

[0058] The height-adjustable pre-scraper blade can be a first height-adjustable pre-scraper blade. The pre-scraper device may also have a second height-adjustable pre-scraper blade. The second height-adjustable pre-scraper blade can be arranged laterally to the driving direction, adjacent to the first height-adjustable pre-scraper blade. The second height-adjustable pre-scraper blade is movable in height relative to the first height-adjustable pre-scraper blade.

[0059] Considering turning or lateral tilting, arranging two or more height-adjustable pre-scraper blades may be an alternative solution. However, the arrangement of two or more height-adjustable pre-scraper blades can also be combined with rotatable height-adjustable pre-scraper blades. The two or more height-adjustable pre-scraper blades can rotate about the same or different axes of rotation.

[0060] When viewed from the direction of travel, the first adjustable-height pre-scraper blade can be positioned in the same location as the second adjustable-height pre-scraper blade. The first and second adjustable-height pre-scraper blades can be arranged to be aligned with each other, particularly with respect to the direction of travel.

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

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

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

[0064] The height-adjustable pre-scraper blades (particularly the first and second height-adjustable pre-scraper blades) are suitable for stepless adjustment. The vertical position of the height-adjustable pre-scraper blades (particularly the first and second height-adjustable pre-scraper blades) is also stepless.

[0065] The control unit is adapted to steplessly move the height-adjustable pre-scraper blade. The control unit is also adapted to steplessly move a first height-adjustable pre-scraper blade and a second height-adjustable pre-scraper blade. Furthermore, the control unit is adapted to steplessly rotate the height-adjustable pre-scraper blade.

[0066] Both the first and second adjustable-height pre-scraper blades can rotate between an angle of -10 degrees and +10 degrees, preferably between -3 degrees and +3 degrees. The control unit can be configured to rotate the adjustable-height pre-scraper blades between an angle of -10 degrees and +10 degrees, preferably between -3 degrees and +3 degrees. The control unit can be configured to rotate the first adjustable-height pre-scraper blade between an angle of -10 degrees and +10 degrees, preferably between -3 degrees and +3 degrees, particularly independently of the second adjustable-height pre-scraper blade. The control unit can be configured to rotate the second adjustable-height pre-scraper blade between an angle of -10 degrees and +10 degrees, preferably between -3 degrees and +3 degrees, particularly independently of the first adjustable-height pre-scraper blade. The control unit can be configured to rotate the first and second adjustable-height pre-scraper blades together.

[0067] This angle should be understood in particular as the deviation from the horizontal line. Specifically, at a 0-degree angle, the lower edge of the height-adjustable pre-scraper blade is horizontally aligned.

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

[0069] The control unit can be configured to adjust or control the rotation of the adjustable-height pre-scraper blade based on the current installation conditions (e.g., turning and / or lateral tilting). The control unit can be adapted to adjust or control the rotation of the adjustable-height pre-scraper blade based on the current installation conditions in conjunction with one or more measurements from a measuring system.

[0070] The pre-scraper assembly may also be equipped with an auxiliary plate. This auxiliary plate may be adjustable, particularly height-adjustable. The auxiliary plate may be adjustable along or against the direction of travel, or horizontally. The auxiliary plate may be positioned along the direction of travel between the height-adjustable pre-scraper and the lateral distribution device (particularly the center bearing block of the lateral distribution device). The auxiliary plate may have a positive effect on segregation of the paving material in the area of ​​the center bearing block. The auxiliary plate can reduce the space behind the center bearing block, particularly when adjusted along or horizontally. The horizontal distance between the auxiliary plate and the center bearing block can be adjusted by adjusting the auxiliary plate. The auxiliary plate may prevent or reduce cooling of the paving material in the area behind the center bearing block. The auxiliary plate (particularly a metal plate) may have elongated holes. These elongated holes may extend along the direction of travel or horizontally.

[0071] As used in the description of the various embodiments described and in the appended claims, the singular form should be understood to include the plural form, and vice versa, unless the context clearly indicates otherwise.

[0072] The terms "first," "second," "third," and "fourth" should be understood as being used only to identify specific elements or components, and do not necessarily indicate a specific order or combination 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. Attached Figure Description

[0073] Advantageous embodiments of the present invention will now be explained in more detail with reference to the accompanying drawings.

[0074] Figure 1 A side view of a road paver according to the present invention is shown.

[0075] Figure 2 A perspective view of a road paver according to the present invention is shown.

[0076] Figure 3 A top view of the longitudinal conveying device, the transverse distribution device, and the screed of the road paver according to the present invention is shown.

[0077] Figure 4 It shows Figure 3 The ironing board shown is a top view according to an alternative embodiment of the present invention.

[0078] Figure 5 A side sectional view of a portion of a road paver according to the present invention is shown.

[0079] Figure 6 A perspective view of the pre-scraper device, lateral distribution device, and deflector device of the road paver according to the present invention is shown.

[0080] Figure 7 It shows Figure 6 The diagram shows a perspective view of an alternative embodiment of the deflection plate device according to the present invention.

[0081] Figure 8 It shows Figure 6 The perspective view of the pre-scraper device shown is according to another alternative embodiment of the present invention.

[0082] Figure 9 A side sectional view of a portion of the road paver according to the present invention in a first position is shown.

[0083] Figure 10 A side sectional view of a portion of the road paver according to the present invention in a second position is shown.

[0084] Figure 11 A side sectional view of a portion of the road paver according to the present invention is shown in a third position.

[0085] Figure 12 A perspective view of a portion of a road paver according to the present invention is shown.

[0086] Figure 13 The road paver according to the present invention is shown. Figure 12 The portion shown is a three-dimensional view viewed from below. Detailed Implementation

[0087] Figure 1 and Figure 2 A side view and a perspective top view of a road paver 1 according to the present invention for generating a paving layer 2 on ground surface 3 are shown. The road paver 1 has a material hopper 4 at its front along the paving travel direction 100. The paving material 6 contained therein is conveyed from the material hopper 4 to the screed 7 of the road paver 1 via a longitudinal conveying device 5 against the paving travel direction 100. The longitudinal conveying device 5 is arranged within the chassis 8 of the road paver 1 and first conveys the paving material 6 to a transverse distribution device 9 arranged in front of the screed 7 along the paving travel direction 100. This transverse distribution device 9 is adapted to distribute the paving material 6 in front of the screed 7 along a transverse direction 200 transverse to the paving travel direction 100.

[0088] The extension of the paving layer 2 in the lateral 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 extended screed portion 11. The working width 210 of the paving layer 2 can be changed and adjusted by laterally extending the extended screed portion 11.

[0089] The paver 1 also has a control unit 37. This 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 vertically.

[0090] Figure 3 A schematic top view of the screed 7 and longitudinal conveying device 5 of the road paver 1 according to the present invention is shown. The longitudinal conveying device 5 has a conveyor belt in the form of a scraper belt 12. The scraper belt 12 includes a left scraper belt section 13a and a right scraper belt section 13b. The labels "left" and "right" should be understood as referring to the view along the paving travel direction 100.

[0091] The spreading material 6, which falls onto the base of the screed 10 body of the screed 7 by means of the scraper belt 12, is distributed along the front side 14 of the base of the screed 10 body by the transverse distribution device 9, as shown by arrow 220.

[0092] The rear wall 15 of the chassis 8 of the road paver 1 and the front side 14 of the base screed 10 together form a lateral distribution channel 16 for the lateral distribution device 9, which is also called the screw cavity.

[0093] The extension ironing plate component 11 of the ironing plate 7 can extend laterally in the transverse direction 200 relative to the base ironing plate 10 body, thereby allowing the ironing plate 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 ironing plate 7.

[0094] The paving material 6 is conveyed from the scraper belt 12 of the longitudinal conveyor 5 to the 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 the transverse distribution channel 16 along the transverse direction 200, which is transverse to the paving travel direction 100.

[0095] The lateral distribution device 9 is attached to the rear end of the chassis 8 of the paver 1. The lateral distribution device 9 includes 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 center bearing block.

[0096] The housing formed by the screw suspension 19 contains a worm gear drive (not shown) for powering the two distribution screws 17 and 18. The lateral distribution device 9 includes a shaft 20, which can be two separate shafts (left shaft 21, right shaft 22) or a single shaft shared by the two distribution screws 17 and 18. The left distribution screw 17 is detachably connected to the left shaft 21. The right distribution screw 18 is detachably connected to the right shaft 22. The outer end of each of the left and right shafts 21 and 22, i.e., the end facing away from the screw suspension 19, is supported in a helical bearing 23.

[0097] Figure 3 The pre-scraper device 24 according to the present invention is not shown in the figure. The position of the pre-scraper device 24 is indicated by reference numeral 24 in the figure.

[0098] exist Figure 3 In the illustrated embodiment, the front edge 14 of the base ironing plate 10 body is arranged in front of the front edge 25 of the extended ironing plate portion 11 along the travel direction 100. This type of ironing plate 7 is referred to as a rear ironing plate or a rear ironing plate.

[0099] Figure 4 A top view of an alternative embodiment of the screed 7 of the road paver 1 according to the present invention is shown. Figure 3 Compared to the embodiment in the previous one, the front edge 25 of the extended ironing plate portion 11 is arranged in front of the front edge 14 of the base ironing plate 10 along the travel direction 100. This type of ironing plate 7 is referred to as a front ironing plate or a front ironing plate.

[0100] exist Figure 4 In the diagram shown, the extended ironing board portion 11 is in the extended position. Figure 4 The transverse dispensing device 9 and the pre-scraper device 24 according to this invention are not shown in the diagram. The position of the transverse dispensing device 9 is indicated in the transverse dispensing channel 16.

[0101] The road paver 1 may have a deflector device 26, which is arranged along the travel direction 100 between the longitudinal conveying device 5 and the transverse distribution device 9. The deflector device 26 may have a height-adjustable deflector.

[0102] Figure 5 A side sectional view of a portion of the road paver 1 according to the present invention is shown. The screw suspension 19 of the lateral distribution device 9 is attached to the chassis 8 in an adjustable height manner via a cylinder 27. Figure 5 The dashed line in the middle indicates the paving material height 28 of paving material 6.

[0103] The pre-scraper device 24 is attached to the chassis 8 or the spiral suspension 19 via a bracket 29. Alternatively, the bracket 29 may be attached to the ironing plate 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.

[0104] Figure 6 A perspective view of the pre-scraper device 24, the lateral distribution device 9, and the deflector device 26 of the road paver 1 according to the present invention is shown. The deflector device 26 is optional.

[0105] The pre-scraper device 24 has a support structure 31. This support structure 31 is mounted on the spiral suspension 19. The pre-scraper blade 30 is mounted on the support structure 31 via an adjusting device 32, which is in the form of a hydraulic cylinder or pneumatic cylinder. The adjusting device 32 can be used to adjust the vertical position of the pre-scraper blade 30.

[0106] Figure 7 and Figure 8 It shows Figure 6 A perspective view of an alternative embodiment of the pre-scraper device 24 shown.

[0107] Figure 7 The pre-scraper device 24 shown has a pre-scraper blade 30, which is adapted to rotate by an angle 400 about an axis parallel to the driving direction 100. The rotation of the pre-scraper blade 30 can be achieved by 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 each other, especially by a control unit 37.

[0108] 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 move independently of each other in height. Therefore, a vertical offset 310 can be achieved between the left pre-scraper blade 35 and the right pre-scraper blade 36. In particular, the adjusting device 32 has a left actuating element 33 and a right actuating element 34, which can be controlled independently of each other, particularly 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 the individual control of the left actuating element 33 and the right actuating element 34.

[0109] Alternatively, or in addition to height adjustment, the left pre-scraper blade 35 and the right pre-scraper blade 36 can be adapted to rotate about an axis extending parallel to the travel direction 100. The left pre-scraper blade 35 can be adapted to rotate by a first angle 410 about a first axis parallel to the travel direction 100. The right pre-scraper blade 36 can be adapted to rotate by a second angle 420 about a second axis parallel to the travel direction 100. The rotation of the left pre-scraper blade 35 can be achieved by a left actuating element 33. The rotation of the right pre-scraper blade 36 can be achieved by a right actuating element 34. The adjusting device 32 may have additional actuating elements, particularly a second left actuating element and a second right actuating element, which are adapted to rotate the left and right pre-scraper blades, respectively. The control unit can be adapted to rotate the left and right pre-scraper blades 35 and 36 by the same angle. The control unit can also be adapted to rotate the left and right pre-scraper blades 35 and 36 by different angles, particularly in different directions.

[0110] 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 (without reference numerals). The measuring system includes a sensor 38. The sensor 38 is arranged between the lateral distribution device 9 and the screed 7, particularly between the height-adjustable pre-screed blade 30 and the base screed 10. The sensor 38 is downwardly aligned and 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 height 28 of the paving material below the sensor 38 can be determined by the sensor 38 and / or the control unit 37. The paver 1 may also have multiple sensors 38.

[0111] The height 320 of the distribution screw 17 is defined as the vertical distance between the distribution screw rotation axis 39 extending laterally 200 and the ground surface 3. The paving material height 28 between the height-adjustable pre-scraper 30 and the base screed 10 is shown by 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.

[0112] exist Figure 9In [description], the lateral distribution device 9 is arranged at a first position at a first distribution screw height 320 above the ground 3. The screed 7 is arranged at a second position at a first screed height 340 above the ground 3. The amount of paving material 6 required upstream of the screed 7 or the target value of 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 of the paving material height 330 upstream of the screed 7 can be achieved through user input. Then, the control unit 37 compares the target value of the paving material height 330 with the paving material height 330 measured by the sensor 38. According to the possible difference between the target value and the measured value, the vertical position of the adjustable-height pre-screed blade 30 is adjusted.

[0113] In Figure 10 [description], the lateral distribution device 9 is arranged at a first position (as Figure 9 shown). The screed 7 is arranged at a third position at a second screed height 340 above the ground 3. Figure 10 The screed height 340 in Figure 9 is greater than the screed height 340 in Figure 9 Compared with the first height of the pre-screed blade 30 as shown in Figure 10 shown, the adjustable-height pre-screed blade 30 moves vertically upward and is at a second height, at which a greater paving material height 330 can be fed in front of the screed 7. Due to the greater paving material height 330 in front of the screed 7, more paving material 6 can be obtained in front of the screed 7, which is necessary for a larger screed height 340.

[0114] In Figure 11 [description], the screed 7 is arranged at a second position (as Figure 10 shown) at a second screed height 340 above the ground 3. The lateral distribution device 9 is arranged at a fourth position at a second distribution screw height 320 above the ground 3. Figure 11 The distribution screw height 320 in Figure 9 and Figure 10 is higher than the distribution screw height 320 in Figure 10 Compared with the second height of the pre-screed blade 30 as shown in

[0115] Figure 12 shows a side sectional view of a part of a road paver according to the present utility model. Figure 13 shows Figure 12 the perspective view from below of the part shown in Figure 13 on the contrary, Figure 12 The left distribution screw 17 and right distribution screw 18 are not shown. The center bearing block 19 or screw suspension 19 of the lateral distribution device 9 is arranged between the deflector plate device 26 and the pre-scraper blade 30 in the travel direction 100. An auxiliary plate 40 is provided in front of the pre-scraper blade 30. This auxiliary plate 40 is arranged between the pre-scraper blade 30 and the center bearing block 19. Viewed from the lateral direction 200, the auxiliary plate 40 is arranged in the area of ​​the center bearing block 19. The side of the auxiliary plate 40 facing the center bearing block 19 can be largely vertically aligned. The auxiliary plate 40 can be adapted to be adjustable in the travel direction 100 or in the horizontal direction. This can be achieved, for example, through an elongated hole 41 in the auxiliary plate 40. The elongated hole 41 extends particularly along the travel direction 100 or horizontally. By adjusting the auxiliary plate 40, the distance between the auxiliary plate 40 and the center bearing block 19, particularly the horizontal distance, can be adjusted. The auxiliary plate 40 is attached to the pre-scraper blade 30 by fastening devices 42 (e.g., screws and nuts). The fastening device 42 extends through an elongated hole 41 in the auxiliary plate 40. The position of the fastening device 42 in the elongated hole 41 can be used to adjust the position of the auxiliary plate 40 along the travel direction 100.

Claims

1. A road paver (1) for generating a paving layer (2) from paving material (6), said road paver (1) comprising: Ironing board (7), which includes at least one base ironing board (10). A lateral distribution device (9) is used to distribute the paving material (6) laterally to the front of the screed (7) in the direction of travel (100) of the road paver (1), and A pre-scraper device (24) is arranged behind the lateral distribution device (9) along the travel direction (100). Its features are, The pre-scraper device (24) has a pre-scraper blade (30) with adjustable height, the pre-scraper blade (30) being arranged in the area of ​​the base ironing plate (10).

2. The road paver according to claim 1, characterized in that, The height-adjustable pre-scraper blade (30) is able to move in height during the 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 able to move 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 lateral 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 lateral 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 ironing plate (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 ironing plate (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 ironing plate (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 ironing plate (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 lateral 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 ironing plate (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 ironing plate (10).

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

14. The road paver according to any one of claims 1 to 9, characterized in that, The ironing board (7) has an extended ironing board portion (11), wherein the extended ironing board portion (11) is arranged laterally next to the base ironing board (10), wherein the front edge (25) of the extended ironing board portion (11) is arranged in front of the front edge (14) of the base ironing board (10) along the travel direction (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) configured to adjust the height of the adjustable-height 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 capable of rotating about a rotation axis during operation of the road paver (1), wherein the rotation axis extends parallel to the travel direction (100).

18. The road paver according to claim 17, characterized in that, The height-adjustable pre-scraper blade (30) is able to rotate about the rotation axis during the paving operation 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 laterally to the driving direction (100) next to the first height-adjustable pre-scraper blade (35), wherein the second height-adjustable pre-scraper blade (36) is adapted to be height-movable relative to the first height-adjustable pre-scraper blade (35).

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