A screed and tamper rod arrangement for a paving apparatus or paving application

Abstract

Aspects of the present disclosure relate to systems, devices, and methods for a screed system including a tamper bar subsystem for a road paver, the tamper bar subsystem including a screed, a tamper bar subsystem, and a tamper bar drive subsystem. The screed has a first paving surface having a first pattern for contacting paving material. The tamper bar subsystem is positioned forward of the screed in a paving direction of the screed system and includes a tamper plate and a tamper bar. The tamper plate has a second paving surface having a second pattern for contacting paving material. The tamper bar drive subsystem is coupled to the tamper bar and is configured to selectively move the tamper bar in a direction that is not parallel to the paving direction of the screed system between a first position and a second position.

Description

Cross-reference to related applications

[0001] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 579,282, filed August 28, 2023, the contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to systems and methods for paving. Background Technology

[0003] Road pavers are used to apply paving materials (such as hot-mix asphalt or concrete) to surfaces in locations such as highways, airports, roads, and construction sites. The paving material is typically loaded in a hopper in front of the paver's tractor and conveyed to the rear via a set of scraper feeders (conveyors). The paving material is then spread to the desired width by a set of augers within the paver and leveled and compacted by a screed system. The screed system is typically towed behind the paver's tractor. A hydraulic arm can be attached between the tractor and the screed system's tow arm to control the angle between the paving surface and the screed plate. The screed plate is typically heated to effectively spread, level, and compact the paving material on the surface to be paved. The angle of the screed plate relative to the surface to be paved is usually manually set by the paver operator at the start of the paving operation. However, the paving material used to create thick layers can be difficult to handle. For example, uncompacted paving material that is deep enough to be compacted into thick layers may not be dense enough to support the weight of the paver, which could cause the paver to get stuck. Summary of the Invention

[0004] The following is a simplified summary of one or more aspects of the technology disclosed herein, in order to provide a basic understanding of such aspects. This summary is not a comprehensive overview of all anticipated aspects, nor is it intended to identify key or essential elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as an introduction to the more detailed description that follows.

[0005] In some aspects, a screed system for a road paver includes a screed, a tamping bar subsystem, and a tamping bar drive subsystem. The screed has a first paving surface having a first pattern for contacting the paving material. The tamping bar subsystem is positioned in front of the screed along the paving direction of the screed system. The tamping bar subsystem includes a tamping plate and a tamping bar. The tamping plate has a second paving surface having a second pattern for contacting the paving material. The tamping bar drive subsystem is coupled to the tamping bar and configured to selectively move the tamping bar between a first position and a second position in a direction not parallel to the paving direction of the screed system.

[0006] In some aspects, the screed system and tamping system for a road paver include a screed subsystem and a tamping subsystem. The screed subsystem includes a screed plate. The screed surface of the screed plate is configured to contact the paving material in a horizontal extension direction of the screed surface and has protrusions of a first pattern extending therefrom. The tamping subsystem includes a tamping plate and a tamping drive subsystem, the tamping subsystem being positioned in front of the screed plate along the travel direction of the road paver. At least a portion of the tamping surface of the tamping plate is configured to contact the paving material with a horizontal extension of the tamping surface and has protrusions of a second pattern extending therefrom. The tamping subsystem is selectively movable from a first position to a second position, wherein the movement between the first and second positions is at least partially in a direction perpendicular to the horizontal extension of the tamping surface.

[0007] In some aspects, a screed system for a road paver includes a screed, a tamping bar subsystem, and a control system. The screed has a first paving surface configured to contact the paving material. The tamping bar subsystem is positioned in front of the screed along the paving direction of the screed system. The tamping bar subsystem includes a tamping plate and a tamping bar. The tamping plate has a second paving surface configured to contact the paving material. A tamping bar drive subsystem is coupled to the tamping bar and configured to selectively move the tamping bar between a first position and a second position in a direction not parallel to the paving direction of the screed system. The control system is configured to receive information representing the material properties of the paving material and to determine at least one of the tamping bar's stroke length and vibration amount based on the material properties of the paving material.

[0008] To achieve the foregoing and related objectives, one or more aspects of this disclosure include the features fully described below and specifically pointed out in the claims. The following detailed description and drawings include certain illustrative features of one or more aspects. However, these features only indicate some of the various ways in which the principles of different aspects can be employed, and this specification is intended to include all such aspects and their equivalents. Attached Figure Description

[0009] The features of the technology described herein are set forth in the following description, the appended claims, and the accompanying drawings. Throughout the description and drawings, identical parts are designated by the same reference numerals. The drawings are not necessarily drawn to scale, and some figures may be shown in an exaggerated or generalized form for clarity and brevity. However, the present disclosure itself, as well as the preferred modes of use, further objectives, and advancements thereof, will be best understood when read in conjunction with the accompanying drawings and by referring to the following detailed description of illustrative embodiments.

[0010] Figure 1 The illustration shows a side view of an example road paver according to aspects of this disclosure.

[0011] Figure 2 The illustration shows aspects according to this disclosure. Figure 1 A view of an example ironing system for a road paver.

[0012] Figure 3 The illustration shows the case with the housing removed according to aspects of this disclosure. Figure 2 The ironing system.

[0013] Figure 4 The illustration shows the case with the housing removed according to aspects of this disclosure. Figure 2 The ironing system.

[0014] Figure 5 The illustrations depict aspects according to this disclosure. Figure 1 A schematic diagram of a road paver.

[0015] Figure 6 The illustrations depict aspects according to this disclosure. Figure 5 A block diagram of the tamping bar drive subsystem of a road paver.

[0016] Figure 7 The illustrations depict aspects according to this disclosure. Figure 1 A schematic diagram of a road paver from below, showing a first example pattern of the tamping plate and screed.

[0017] Figure 8 The illustrations depict aspects according to this disclosure. Figure 1 Detailed side view of the screeding system and tamping system of the road paver.

[0018] Figure 9 The illustrations depict aspects according to this disclosure. Figure 1 Another detailed view of the side of the road paver's screeding system and tamping system.

[0019] Figure 10 The illustration shows an aspect of the present disclosure for use with Figure 1 An example system diagram showing the various hardware components and other features used together with a road paver.

[0020] Figure 11 The aspects shown in this disclosure are related to Figure 1 A representative block diagram of the various example system components used together with a road paver.

[0021] Figure 12 The illustrations depict aspects according to this disclosure. Figure 7 Representative bottom-view perspective views of various example features of a road paver, including a first example pattern of the tamping plate and screed.

[0022] Figure 13 The illustrations depict aspects according to this disclosure. Figure 12A representative bottom view of a road paver, including various features of a second example pattern of tamping and screed.

[0023] Figure 14 The illustrations depict aspects according to this disclosure. Figure 13 A representative bottom-view perspective view of a road paver, showing a second example pattern of the tamping slab and screed.

[0024] Figure 15 The illustrations depict aspects according to this disclosure. Figure 14 A representative bottom view of a road paver, showing a third example pattern of the tamping slab and screed.

[0025] Figure 16 The illustrations depict aspects according to this disclosure. Figure 15 A representative bottom-view perspective view of a road paver, showing a third example pattern of the tamping plate and screed. Detailed Implementation

[0026] The specific embodiments described below with reference to the accompanying drawings are intended as a description of various configurations and are not intended to represent the only configurations in which the concepts described herein can be practiced. Specific details are included to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some examples, well-known structures and components are shown in block diagram form to avoid obscuring these concepts.

[0027] Figure 1 and Figure 2 A road paver 100 according to aspects of this disclosure is illustrated. The road paver 100 includes a tractor 104 and a screed system 108. The tractor 104 may include a hopper, a conveying system, and a cab 112 including an operating controller 114. An operator can use the operating controller 114 to drive the road paver 100, actuate various features of the road paver 100, etc. The operating controller 114 may include an operator input / output (I / O) interface 115 and a computing system 1300. The operator I / O interface 115 may include input devices, such as a joystick, a keypad, voice command input, etc., to allow the operator to input commands or information to the paver 100. The operator I / O interface 115 may include output devices, such as a screen, LED indicators, an audible alarm, etc., configured to provide the operator with information about the operation of the paver 100.

[0028] The traction machine 104 can be connected to the screed system 108 via one or more traction arms 116. A hydraulic cylinder 120 can engage with the traction arm 116 at a traction point 130 to adjust the position of the screed system 108 relative to the surface to be paved. For example, the hydraulic cylinder 120 can be used to change the angle of attack A of the screed system 108. As used herein, the phrase "angle of attack" (AoA) refers to the angle between the screed plate 316 and the surface to be paved, such as... Figure 2 As shown. Setting pin 124 can be connected between traction arm 116 and ironing system 108. Setting pin 124 can be actuated by an operator (e.g., via handle 126) to further adjust the angle A between ironing system 108 (including one or more ironing plates 316) and the surface to be paved.

[0029] During paving, paving material 128 is fed from the hopper via a conveying system in the direction indicated by arrow 134 and deposited in front of the front end 138 of the screed system 108. The screed plate 316 of the screed system is configured to spread and compact the paving material along the surface to be paved. As schematically shown in section 128a, the paving material 128 is loosest (e.g., least dense, least compacted, least smooth) near the front end of the screed system 108. As the screed system 108 slides over the paving material 128, the paving material 128 becomes less loose (e.g., more dense, more compacted, smoother), as schematically shown at 128b. The paving material 128 is most compacted near the rear end 142 of the screed system 108, as schematically shown at 128c. The angle of attack A affects the density and slope of the paving material. In some aspects of this disclosure, the angle of attack A can be between 2° and 5°.

[0030] like Figure 3 and Figure 4 As shown, the screed unit 304 may include a housing 312, a plurality of screeds 316, a mounting plate 320 having a heating element (not shown), a plurality of pressure sensors 324, a support wall 328, a support plate 332, and an indicator 336. The screeds 316 may be configured to engage paving material 128 dispensed from the road paver 100 to spread and level the paving material 128 along the surface to be paved. In some aspects of this disclosure, the bottom surface of the screeds 316 (e.g., a surface configured to contact the paving material) may include a pattern or texture (see, for example...). Figure 14 Features 314a-314c show protrusions that gradually flatten in the direction of travel of the road paver, such as ridges, mounds, undulations, or terrain high points, forming patterns such as wavy patterns, V-shaped patterns, block patterns, diamond patterns, or deformable wavy patterns. In some aspects of this disclosure, the screed 316 includes a plurality of modular individual screeds 316a, 316b...316j, such as... Figure 3As illustrated. In other aspects of this disclosure, the screed 316 may be a single screed. A mounting plate 320 having a heating element may be attached to the screed 316 and configured to heat the screed 316. Heating the screed 316 prevents hot paving material from sticking to the screed 316 and maintains an elevated temperature during paving to prevent premature cooling of the paving material 128. In some aspects of this disclosure, the heating element may be an electrically heated element powered by the power supply of the traction machine 104. The following PCT applications, filed March 27, 2023, entitled “Independently Adjustable Screed Plates” and PCT / US 2023 / 065008, entitled “Pressure sensor for a Screed Plate Apparatus”, filed February 2, 2022, describe an example screed system 108 that can be used with a road paver 100, the entire contents of which are hereby incorporated herein by reference.

[0031] In some aspects, the ironing system 108 also includes a tamping bar subsystem 400. For example... Figures 1-2 , Figure 5 and Figures 8-9 As shown, the tamping bar subsystem 400 can be positioned in front of the screed 316 along the paving direction B of the road paver 100. The tamping bar subsystem 400 includes a tamping plate 404, a tamping bar 406, and a tamping bar drive subsystem 408.

[0032] See now Figures 6-9 The tamping plate 404 includes a first surface or tamping surface 412 configured to contact the paving material M and a second surface 416 configured to engage the tamping rod 406 opposite to the first surface 412. At least a portion of the first surface 412 is configured to contact the paving material, including a horizontally extending surface. In other respects, the first surface 412 may be generally horizontal, such as... Figure 7 As shown. The first surface 412 of the ramming plate 404 may include a raised pattern or texture 414 ( Figure 5 For example, ridges, mounds, undulations or terrain high points that gradually flatten as the road paver travels in the direction of travel, forming patterns such as wave patterns, V-shaped patterns, block patterns, diamond shapes, deformable wave patterns or combinations thereof. Figure 7 and Figure 12 The first example pattern or texture 414a of the tamping plate 404 and the first example pattern 314a of the ironing plate 316 are shown in bottom view and bottom perspective view, respectively. Figure 13 and Figure 15The bottom view and the bottom perspective view of the second example pattern or texture 414b of the tamping plate 404 and the second example pattern 314b of the ironing plate 316 are shown respectively. Figure 15 and Figure 16 Bottom view and bottom perspective view of the third example pattern or texture 414c of the tamping plate 404 and the third example pattern 314c of the ironing plate 316 are shown respectively. In some aspects, the pattern or texture 414 may be the same as the pattern of the ironing plate 316. In some aspects, the pattern 414 may be different from the pattern of the ironing plate 316. In some aspects, the pattern or texture 414 may be a continuation of the pattern of the ironing plate 316.

[0033] In some respects, similar to the heating element described with respect to ironing plate 316, one or more heating elements may be coupled to or in contact with ramming plate 404.

[0034] like Figure 9 As shown, in some aspects, the first end or front end 420 of the tamping plate 404 (e.g., the first edge in the direction of travel of the road paver 100) is curved to facilitate the sliding of the paving material beneath the front end 420 of the tamping plate 404. In these aspects, the curve flattens towards the second end or rear end 424 of the tamping plate 404. In these aspects, portions of the tamping plate 404 are generally flat near the rear end 424, such that the rear end 424 is coplanar with the screed 316. In these aspects, the front end 420 of the tamping plate 404 extends flexibly from the horizontally extending portion of the tamping surface 412.

[0035] like Figure 6 As shown, the tamping rod drive subsystem 408 includes a motor 428 and a transmission system 432. See now... Figure 5A tamping rod drive subsystem 408 is coupled to tamping rod 406 and configured to move tamping rod subsystem 400 independently of screed system 108. For example, tamping rod drive subsystem 408 is configured to actuate tamping rod subsystem 406 in a direction not parallel to the paving direction indicated by arrow B of paving system 100 to precompact the paving material before it contacts screed 316 for further compaction. For example, in some aspects, tamping rod drive subsystem 408 is configured to actuate tamping rod subsystem 400 in a direction generally transverse to paving direction B (as indicated by arrow A). Tamping rod drive subsystem 408 can actuate tamping rod 406 between a first position adjacent to the paving material and a second position above the paving material. The second position can be a distance D above the first position. Distance D may be interchangeably referred to herein as stroke length. Repeated actuation of tamping rod 406 between the first and second positions, for example, precompacts the paving material, increasing the density of the paving material. Precompacting the paving material helps to push the precompacted paving material under the screed 316, rather than having it pushed forward by the screed 316. In some aspects, the tamping bar 406 can be actuated at a frequency of about 500 revolutions per minute (rpm) to about 1800 rpm. In some aspects, the frequency can be determined based on the desired speed of the paver 100. For example, the frequency can be determined such that the paving material will be precompacted before it contacts the screed 316 at the desired speed of the road paver. In some aspects, the speed of the road paver 100 can be determined based on the frequency of the tamping bar 406. For example, the speed of the road paver 100 can be determined such that when the tamping bar 406 is actuated at the desired frequency, the paving material will be precompacted before it contacts the screed 316.

[0036] In some respects, distance D can be determined based on the desired AoA of the screed 316. For example, distance D can be established such that the actuation of the tamping rod 406 reduces the height of the paving material deposited in front of the screed system 108, such that when the screed 316 is at the target AoA, the height of the pre-compacted paving material near the front end of the screed 316 is approximately the same as the height H of the front end of the screed 316 above the compacted paving material, or the height of the pre-compacted paving material near the front end of the screed 316 is less than the height H of the front end of the screed 316 above the compacted paving material. This can help maintain the screed 316 at the target AoA during compaction.

[0037] In some aspects, the distance D can be from about 2 mm to about 7 mm. In some aspects, the distance D can be continuously adjusted between about 2 mm and about 7 mm. In some aspects, the distance D can be set in discrete increments, such as about 2 mm, about 4 mm, and about 7 mm. In some aspects, the distance D can be determined based on the desired compaction thickness of the paving material. For example, a distance D of about 4 mm can be used, and the paving material will have a compaction pad thickness of about 3 inches to about 4 inches.

[0038] The compaction of the paving material by the tamping bar 406 can be advantageous for paving thicker paving material mats. For example, a thicker paving material mat can include a mat with a compaction depth of about 3 inches to about 10 inches. The amount of uncompacted paving material required to provide a thick mat of compacted paving material is usually not dense enough to be laid at such a thickness by a paver without a tamping bar system, as the screed would get stuck. However, the compaction provided by the tamping bar 406 increases the density of the paving material, making it possible to compact it by the screed system 108.

[0039] In some aspects, the tamping rod drive subsystem 408 is configured to selectively vibrate the tamping rod subsystem 400. In some aspects, the tamping rod drive subsystem 408 is configured to simultaneously actuate and vibrate the tamping rod subsystem 400 in a direction generally transverse to the paving direction. In some aspects, the movement between the first position and the second position is at least partially in a direction perpendicular to the horizontal extension of the first surface 412 of the tamping plate 404.

[0040] The tamping rod drive subsystem 408 can be controlled by the computing system 1300 or by another on-board controller. The computing system 1000 is configured to actuate the tamping rod subsystem 400 to compact the paving material before it contacts the screed 316, which increases the density of the paving material in contact with the screed 316.

[0041] In some aspects, the computing system 1300 can be configured to receive information representing the material properties of the paving material. In some aspects, the computing system 1000 can be configured to determine the material properties of the paving material based on data received from one or more sensors (e.g., pressure sensors). In some aspects, the computing system 1000 can be configured to receive information representing the material properties of the paving material via I / O interface 115. In some aspects, the material properties of the paving material may include the density of the paving material, the stiffness of the paving material, the aggregate size of the material, etc. For example, the computing system 1300 can be configured to determine the density of the paving material based on the pressure sensed by pressure sensor 324. For example, the computing system 1300 can be configured to determine the density of the paving material based on a lookup table storing correlation data between pressure and density. In some aspects, the computing system 1300 can be configured to determine a distance D based on the material properties of the paving material. In other aspects, the operator of the paving system 100 can set the distance D manually or via operator I / O interface 115.

[0042] In some aspects, the calculation system 1000 may be configured to receive information representing the material properties of the paving material. In some aspects, the material properties of the paving material may include the density of the paving material, etc. In some aspects, the calculation system 1300 may be configured to determine the amount of vibration, vibration rate, and / or vibration duration of the tamping slab 404 based on the material properties of the paving material. In some aspects, the calculation system 1300 may be configured to control the distance D and the amount of pressure applied to the paving material by the tamping rod 406 such that the density of the pre-compacted paving material does not exceed, for example, 90% of the target density of the compacted paving material pad produced by the screed 316. In some aspects, the calculation system 1300 may be configured to control the distance D and the amount of pressure applied to the paving material by the tamping rod 406 to maintain a positive AoA of the screed 316.

[0043] The aspects of this disclosure can be implemented using hardware, software, or a combination thereof and can be implemented in one or more computer systems or other processing systems. In one aspect, this disclosure relates to one or more computer systems capable of performing the functions described herein. Figure 10 Example system diagrams are presented illustrating various hardware components and other features that can be used according to aspects of this disclosure. Aspects of this disclosure may be implemented using hardware, software, or a combination thereof, and may be implemented in one or more computer systems or other processing systems. In one example variant, aspects of this disclosure relate to one or more computer systems capable of performing the functions described herein. Figure 10 An example of such a computer system 1000 is shown. In some aspects of this disclosure, the computer system 1000 may be located in a cab 112. In some aspects of this disclosure, the computer system 1000 may be located within an ironing system 108.

[0044] Computer system 1000 includes one or more processors, such as processor 1000. Processor 1004 is connected to communication infrastructure 1006 (e.g., communication bus, crossbar, or network). Different software aspects are described with respect to this example computer system. After reading this specification, it will become clear to those skilled in the art how to implement aspects of this disclosure using other computer systems and / or architectures.

[0045] Computer system 1000 may include a display interface 1002 that forwards graphics, text, and other data from communication infrastructure 1006 (or from a frame buffer, not shown) for display on display unit 1030. Computer system 1000 also includes main memory 1008, preferably random access memory (RAM), and may also include secondary memory 1010. Secondary memory 1010 may include, for example, a hard disk drive 1012 and / or a removable storage drive 1014, which represents a floppy disk drive, magnetic tape drive, optical disk drive, etc. Removable storage drive 1014 reads from and / or writes to removable storage unit 1018 in a known manner. Removable storage unit 1018 represents floppy disks, magnetic tapes, optical disks, etc., read from and written to by removable storage drive 1014. As will be appreciated, removable storage unit 1018 includes computer-usable storage media in which computer software and / or data are stored.

[0046] Alternatively, auxiliary storage 1010 may include other similar means for allowing computer programs or other instructions to be loaded into computer system 1300. Such means may include, for example, removable storage unit 1022 and interface 1020. Such examples may include program cartridges and cartridge interfaces (such as those found in video game devices), removable memory chips (such as erasable programmable read-only memory (EPROM) or programmable read-only memory (PROM)) and associated sockets, as well as other removable storage units 1022 and interfaces 1002 that allow software and data to be transferred from removable storage unit 1022 to computer system 1000.

[0047] Computer system 1000 may also include a communication interface 1024. Communication interface 1024 allows the transfer of software and data between computer system 1000 and external devices. Examples of communication interface 1024 may include a modem, a network interface (such as an Ethernet card), a communication port, a PCMCIA slot, and cards. Software and data transferred via communication interface 1024 are in the form of signals 1028, which may be electronic, electromagnetic, optical, or other signals that can be received by communication interface 1024. These signals 1028 are provided to communication interface 1024 via a communication path (e.g., a channel) 1026. This path 1026 carries signals 1028 and can be implemented using wires or cables, optical fibers, telephone lines, cellular links, radio frequency (RF) links, and / or other communication channels. In this document, the terms "computer program media" and "computer-usable media" are used generically to refer to media such as removable storage drive 1080, a hard disk installed in hard disk drive 1070, and signals 1028. These computer program products provide software to computer system 1000. This disclosure relates to such computer program products.

[0048] The computer program (also known as computer control logic) is stored in main memory 1008 and / or auxiliary memory 1010. The computer program can also be received via communication interface 1024. When executed, such a computer program enables the computer system 1000 to perform various features according to aspects of this disclosure, as discussed herein. Specifically, when executed, the computer program enables the processor 1004 to perform such features. Therefore, such a computer program represents the controller of the computer system 1000.

[0049] In variations of the implementation of aspects of this disclosure using software, the software may be stored in a computer program product and loaded into the computer system 1000 using a removable storage drive 1014, a hard disk drive 1012, or a communication interface 1020. The control logic (software), when executed by the processor 1004, causes the processor 1004 to perform functions according to aspects of this disclosure as described herein. In another variation, the aspects are implemented primarily in hardware using, for example, hardware components such as application-specific integrated circuits (ASICs). Implementing a hardware state machine to perform the functions described herein will be clear to those skilled in the art.

[0050] In yet another example variant, aspects of this disclosure are implemented using a combination of both hardware and software.

[0051] Figure 11 This is a block diagram of various example system components used in embodiments of this disclosure. Figure 11A communication system 1100 that may be used according to embodiments described herein is illustrated. The communication system 1100 may include one or more users 1160, 1162 and one or more terminals 1142, 1166. For example, terminals 1142, 1166 may include a control system 1120 or related systems. In one embodiment, data used according to embodiments described herein is input and / or accessed by users 1160, 1162 via terminals 1142, 1166, such as personal computers (PCs), minicomputers, mainframes, microcomputers, telephone devices, or wireless devices (such as personal digital assistants (“PDAs” or handheld wireless devices). The terminals are connected to a server 1143 via, for example, a network 1144 (such as the Internet or an intranet) and connection mechanisms 1145, 1146, 1164, such as PCs, minicomputers, mainframes, microcomputers, or other devices having a processor and a data repository and / or being connected to the data repository. Connection mechanisms 1145, 1146, 1164 include, for example, wired, wireless, or fiber optic links. In another example variant, the methods and systems according to the embodiments described herein operate in a standalone environment, such as on a single terminal.

[0052] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but rather to conform to the entire scope consistent with the language of the claims, wherein, unless specifically stated otherwise, reference to an element in the singular form is not intended to mean “one and only one,” but rather “one or more.” Unless specifically stated otherwise, the term “some” means one or more. All structural and functional equivalents of elements in the various aspects described herein that are known to or subsequently known to a person skilled in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Moreover, whatever is disclosed herein, whether or not it is expressly recited in the claims, is not intended to be offered to the public. Unless the element is expressly recited using the phrase “means for…”, no claim element should be construed as means plus function.

Claims

1. A screeding system for a road paver, the screeding system comprising: An ironing board having a first spreading surface having a first pattern for contacting spreading material; A tamping bar subsystem, positioned in front of the screed in the paving direction of the screed system, the tamping bar subsystem comprising a tamping plate and tamping bars, the tamping plate having a second paving surface having a second pattern for contacting the paving material; as well as A tamping rod drive subsystem is coupled to the tamping rod and configured to allow the tamping rod to move selectively between a first position and a second position in a direction not parallel to the paving direction of the screeding system.

2. The ironing system according to claim 1, wherein, The tamping plate can move independently of the ironing plate.

3. The ironing system according to claim 1, wherein, The tamping plate is curved at its first end in the paving direction.

4. The ironing system according to claim 1, wherein, The tamping rod drive subsystem is operable to cause the tamping rod to vibrate between the first position and the second position.

5. The ironing system of claim 1 further includes a control system configured to receive information representing material properties of the paving material and to determine the stroke length or vibration amount of the tamping bar based on the material properties of the paving material.

6. The ironing system according to claim 5, wherein, The material properties of the paving material include its density.

7. The ironing system according to claim 1, wherein, The first pattern and the second pattern are the same pattern.

8. The ironing system according to claim 1, wherein, The first pattern and the second pattern are different patterns.

9. The ironing system according to claim 1, wherein, The first pattern and the second pattern each include a repeating waveform pattern, a repeating V-shaped pattern, a repeating rhombus pattern, a repeating block pattern, a wave pattern, a deformable waveform pattern, or a combination thereof.

10. A screed system and tamping bar system for a road paver, the screed system comprising: An ironing subsystem comprising an ironing plate, wherein the ironing surface of the ironing plate is configured to contact a spread material in a horizontally extending direction thereof, the ironing surface having protrusions of a first pattern extending from the ironing surface; and A tamping bar subsystem, comprising a tamping plate and a tamping bar drive subsystem, the tamping bar subsystem being positioned in front of the screed in the travel direction of the road paver, wherein at least a portion of the tamping surface of the tamping plate is configured to contact the paving material in a horizontal extension of the tamping surface and has protrusions of a second pattern extending from at least a portion of the tamping surface. The tamping rod subsystem is selectively movable from a first position to a second position, and the movement between the first and second positions is at least partially in a direction perpendicular to the horizontal extension of the tamping surface.

11. The ironing system and tamping bar system according to claim 10, wherein, The tamping rod subsystem can move independently of any movement of the ironing system.

12. The ironing system and tamping bar system according to claim 10, wherein, The first end of the ramming plate can bend and extend from the horizontal extension portion of the ramming surface.

13. The ironing system and tamping bar system according to claim 10, wherein, The tamping rod drive subsystem is operable to selectively vibrate the tamping rod system.

14. The ironing system and tamping bar system according to claim 10, further comprising: A control subsystem configured to receive information representing the material properties of the paving material and to selectively change the stroke length or vibration amount caused by the tamping rod drive subsystem on the tamping rod subsystem.

15. The ironing system according to claim 14, wherein, The material properties of the paving material include its density.

16. The ironing system and tamping bar system according to claim 10, wherein, The first pattern and the second pattern include similar pattern elements.

17. The ironing system and tamping bar system according to claim 10, wherein, The first pattern and the second pattern each include a repeating waveform pattern, a repeating V-shaped pattern, a repeating rhombus pattern, a repeating block pattern, a wave pattern, a deformable waveform pattern, or a combination thereof.

18. A screeding system for a road paver, the screeding system comprising: A screed having a first paving surface configured to contact the paving material; A tamping bar subsystem, positioned in front of the screed in the paving direction of the screed system, the tamping bar subsystem including a tamping plate and a tamping bar, the tamping plate having a second paving surface configured to contact the paving material; and a tamping bar drive subsystem connected to the tamping bar and configured to selectively move the tamping bar between a first position and a second position in a direction not parallel to the paving direction of the screed system. as well as A control system configured to receive information representing the material properties of the paving material, and to determine at least one of the stroke length of the tamping bar and the amount of vibration based on the material properties of the paving material.

19. The ironing system according to claim 18, wherein, The material properties of the paving material include its density.

20. The ironing system according to claim 19, wherein, The tamping plate can move independently of the ironing plate.

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