Patent Application
20160177518
The present invention relates to a ground preparation machine, such as compactor, comprising at least one roller rotatable around a roller axis of rotation and, attached to at least one roller, a roller scraper device for scraping off material that adheres to the outer peripheral region of the roller.
During ground preparation or compaction operations, there is always the risk, depending on the material to be prepared or compacted, that such material will adhere to the outer peripheral region of the roller. In particular when asphalt is compacted using a roller having an essentially untextured or smooth outer peripheral region, there is a tendency for asphalt material to adhere to the outer peripheral region or to the essentially smooth outer circumferential surface of the roller. Also, when soil is prepared or compacted with a roller that has a texture on its outer peripheral region, such as one provided with a plurality of padfeet or the like, there is the tendency for material, in particular soil, clay or the like, to accumulate and adhere between the texturing elements, such as the padfeet.
In order to remove such adhering material from the outer peripheral region of a roller, a known solution is to provide roller scraper devices that are generally configured along the compactor roller and have a scraper region, such as a scraper edge, extending close to the outer peripheral region of the roller. If a roller having a textured surface is used or a roller is refitted in such a way that it has a textured outer peripheral region, for example, by being clad with padfeet, then a scraper device designed for an untextured roller must generally be removed and replaced with a scraper device designed for a textured roller. This operation is costly in terms of time and money.
A ground preparation machine having two rollers arranged laterally spaced apart at the front end of the vehicle and two at the rear end of the vehicle is known from U.S. Pat. No. 6,217,255 B1. The rollers are textured on their outer peripheral region and have annular regions projecting radially outward and recessed areas between them. Attached to each of these rollers is a scraper device having a plurality of tooth-like projecting scraper members that are movable on each support toward or away from the outer peripheral region of the attached roller. By means of a hydraulically operated piston/cylinder unit, tooth-like scraper members attached to each other in pairs can be moved as appropriate into or out of the gaps formed between two rings to detach accumulated material from an attached roller when the tooth-like scraper members are positioned to engage in the gaps.
DE-A 1 634 686 discloses a road roller having a convertible roller drum. A plurality of padfeet or the like projecting radially outward is provided on the outer circumference of the roller to texture the outer peripheral region. To provide a roller with an essentially untextured outer peripheral region, the roller can be encased by shell-like sheathing elements so that the padfeet can be concealed beneath a roller shell furnished by the sheathing elements.
The object of the present invention is to provide a ground preparation machine, in particular a compactor, which in a simple way enables a scraper device to be adapted to an operation with a roller having an untextured outer peripheral region as well as to a roller having a textured outer peripheral region.
This object is achieved according to the invention by a ground preparation machine, in particular a compactor, comprising:
In the design according to the invention, it is therefore provided that one and the same scraper device can be used in conjunction with rollers having different configurations of the outer peripheral region. In some cases, adaptive measures may be required inside the scraper device itself. It is not necessary to completely replace a scraper device provided for an untextured roller with a scraper device for a roller having a textured outer peripheral region.
To achieve effective scraping interaction with the design according to the invention, the invention proposes that the scraper bar be extended along the roller preferably essentially parallel to the roller axis of rotation.
In order to be able to adapt the scraper device of the ground preparation machine for interaction with differently designed rollers, the invention proposes that the scraper bar be movable between:
To be able to reach these various positions easily, the invention proposes that the scraper bar swivel around an axis of movement essentially parallel to the roller axis of rotation and/or be displaceable toward and away from the outer peripheral region of the roller.
To attach the scraper bar on a machine frame to permit swivel movement or displacement movement, the invention proposes that the scraper bar be solidly attached at its two end regions to a machine frame in the first operating position and/or in the second operating position and that it be swivel-mounted on the machine frame for movement into and out of the installation/removal position.
To this end, a slot guide may be provided that, for example, is attached to each end region of the scraper bar on the machine frame, the scraper bar being solidly connected or connectable to the machine frame via at least one fastener, preferably a plurality of fasteners, passing through the slot guide in the first and/or second operating position and being able to swivel with respect to the machine frame by means of a fastener passing through the slot guide.
In order to configure scraper devices for scraping interaction with differently designed rollers having the structure according to the invention, the invention proposes that the scraper bar comprise a first mounting region for attaching at least one first scraper member of the first scraper region and a second mounting region for attaching at least one second scraper member of the second scraper region.
This ability to install or remove different scraper members may be achieved in a simple way by virtue of the scraper bar comprising a longitudinally extending bar body and a plurality of scraper member supports on the bar body that provide the first mounting region and the second mounting region.
In an alternative embodiment, the scraper bar can comprise a longitudinally extending bar body comprising at least one first mounting plate providing the first mounting region and at least one second mounting plate providing the second mounting region. The scraper members attached to the different scraper regions, or the support elements supporting them, can be fixed on the preferably essentially flat surfaces of these mounting plates.
To provide scraping interaction with rollers having an untextured outer peripheral region or rollers having a textured outer peripheral region, the invention proposes that the first scraper region comprise at least one scraper member providing a scraper edge running essentially without interruption along the roller axis of rotation and/or that the second scraper region comprise a plurality of projecting tooth-like second scraper members arranged along the roller axis of rotation spaced apart from each other.
In order to obtain the scraping interaction with a roller using the differently configured scraper members in the positions discussed above, the invention further proposes that, when a scraper bar is positioned in the first operating position, the at least one scraper member of the first scraper region be in scraping interaction with the outer peripheral region of the compactor roller and the second scraper members of the second scraper region not be in scraping interaction with the outer peripheral region of the compactor roller but nevertheless be supported on the scraper bar and that, when the scraper bar is positioned in the second operating position, a first scraper member of the first scraper region be removed from the scraper bar and the second scraper members of the second scraper region be in scraping interaction with the outer peripheral region of the roller.
For simple actuation of the scraper bar, such as swiveling or displacement between the different positions, the invention proposes that at least one actuating mechanism be attached or attachable to the scraper bar for swiveling and/or displacing and/or holding the scraper bar.
In order to optimally use the scraper device, or any scraper device, of a ground preparation machine designed according to the invention for scraping material from the outer peripheral region of a roller, the invention proposes that at least one scraper region comprise at least one scraper member that can be brought into scraping interaction with the roller, wherein at least one, preferably each, scraper member, of at least one scraper region is angled relative to a radial line perpendicular to the roller axis of rotation and is inclined in the rotational direction of the roller, and/or at least one, preferably each, scraper member of at least one scraper region is angled relative to the radial line and is inclined counter to the rotational direction of the roller.
In this connection, it is noted that in the context of the present invention the rotational direction used for the definition of the inclination is the rotational direction that the roller has when the ground preparation machine is in motion primarily during ground preparation, for example driving forward. This does not exclude the possibility of other operating states occurring in which the ground preparation machine is moving in the opposite direction and, thus, the roller is turning in the opposite direction around the roller axis of rotation.
In an embodiment that is structurally especially easy to realize and also easy to manage, the invention proposes that a least one scraper member of the first scraper region and at least one scraper member of the second scraper region be inclined in the same direction, preferably in the rotational direction of the roller.
For positioning especially optimized for the scraping action of the first scraper region, the invention proposes that at least one scraper member of the first scraper region be inclined in a first direction, preferably counter to the rotational direction, and at least one scraper member of the second scraper region be inclined in a second direction, preferably in the rotational direction.
In order to remove material from the area of the scraper device that has been detached from an outer peripheral region of a roller, the invention further proposes that a diverting device for diverting material detached from the roller by the scraper member away from the roller be attached to at least one scraper member that is preferably inclined counter to the rotational direction of the roller.
For the scraper members not needed during the operation of the scraper device, at least one storage mounting area may be provided for detachably mounting at least one scraper member not installed on the scraper bar, preferably on a machine frame rotatably carrying the roller.
The present invention further relates to a method for operating a ground preparation machine, in particular a compactor, which is constructed just as previously described or which is designed with at least one scraper device constructed just as previously described attached to at least one roller. In this method, if the ground preparation machine is operated using a roller having an essentially untextured outer peripheral region, at least one scraper device attached to this roller is configured and positioned in such a way that the scraper bar with its first scraper region is in scraping interaction with the outer peripheral region of the roller, and, if the ground preparation machine is operated using a roller having a textured outer peripheral region, at least one scraper device attached to this roller is configured and positioned in such a way that its scraper bar with its second scraper region is in scraping interaction with the outer peripheral region of the compactor roller.
In this context, it may be provided according to the invention that for operation using a roller having a textured outer peripheral region at least one first scraper member of the first scraper region is removed from the scraper bar when the scraper bar is positioned in the installation/removal position, and then the scraper bar is positioned in its second operating position via a swiveling and/or displacement movement.
The present invention is described in detail below with reference to the accompanying figures. In the drawings:
In
Scraper devices can be attached to such a roller 16 to scrape off material, for example soil, asphalt material or the like at the outer peripheral region 26 of roller 16, in particular a surface 27 that in this case is designed to be untextured, that is, smooth. The structure and functionality of scraper devices of this kind are described in detail below in reference to
It should be noted here that a roller 16 may always be constructed with padfeet 28 of this kind, thus having a textured outer peripheral region 26. Alternatively, a roller 16 may also be constructed with the untextured outer peripheral region 26 shown in
The scraper device 36 comprises a scraper bar generally labeled 40. This scraper bar 40 is positioned in such a way that it extends along roller 16 essentially parallel to the roller axis of rotation A and may thereby include its entire axial length in the scraping operation.
The scraper bar 40 comprises a tubular bar body 42 that extends longitudinally. Plate-like mounting elements 48, 50 are secured at its two end regions 44, 46 by welding, for example. Furthermore, respective scraper member supports 52 extend from the bar body 42 at essentially equal spacing from each other. The scraper member supports 52 provide a first mounting region 54 on which a first scraper member 56 of a first scraper region 58, designed in this case in the shape of a uniform plate or blade, can be secured, for example by bolting. In this context, the bolted connection may be made through the corresponding slot 60 in the first scraper member 56 so that it may be disposed transverse to the longitudinally extending direction of the bar body 42 in various displacement positions and then tightened. The scraper member supports 52 further provide a second mounting region 60 on a side oriented opposite to the first mounting region 54. On the second mounting region 60, plate-like or tine-like second scraper members 64 of a second scraper region 66 may be secured to the scraper member supports 52, for example by bolting. The second scraper members 64 may also be designed with a slot 68 through which they are secured using two bolts, for example, so that the second scraper members 64 may also be displaced transverse to the longitudinally extending direction of the bar body 42 or may be secured in different positions. As shown in
Counter mounting regions 70 may be provided on machine frame 30, for example on cross-member 32, attached to the two plate-like mounting elements 48, 50. Each counter mounting region 70 may comprise a slot 72 through which at least two fasteners, for example mounting bolts, may be screwed into corresponding threaded holes 74, 76 of the mounting elements 48, 50. If two bolts or fasteners of this type are screwed into an attached mounting element 48 or 50 while passing through a respective slot 72, the scraper bar 40 is essentially secured against swiveling or tilting but is displaceable in the longitudinal direction of a corresponding slot 72 toward or away from the outer peripheral region 26 of the roller 16. In each of these displacement positions, the scraper bar 40 may be locked by bolting it down. If only one of the mounting bolts is guided through the corresponding slot 72 and screwed into an attached mounting element 48, 50, the scraper bar 48 may be swiveled with or around this fastener within the respective slot 72 and, where applicable, also simultaneously displaced.
Due to the above-described capability of the scraper bar 40 to be mounted on the machine frame 30, it becomes possible to place the scraper bar 40 or its scraper regions 58, 66, and the scraper members 56 and/or 64 respectively provided or to be provided there, in different positions. In this context, it should initially be assumed that in the delivered condition, that is, when it is new, the ground preparation machine 10 is designed just as shown in
If a ground preparation machine 10 of this type is to be used to compact soil, for example, whereupon it is advantageous to equip a roller 16 with padfeet 28, the roller 16 may be provided, for example, with a suitable sheathing so that there is texturing created by the padfeet 28 on its outer peripheral region 26. To be able to also use the scraper devices 36, 38 in this state or for a roller of this type with a textured outer peripheral region 26, the scraper bar 40 may be brought into the installation/removal position shown in
If the scraper bar is in the position shown in
After removal of the first scraper member 56 with the components attached thereto, it is then possible for the scraper bar 40 to be swiveled and displaced from the installation/removal position shown in
It should be noted here that in the first operating position and in the second operating position, the scraper bar 40 may be positioned differently with respect to machine frame 30 or with respect to roller axis of rotation A, for example, having a greater distance from roller axis of rotation A in the first operating position than in the second operating position. However, in principal, the scraper bar 40 could be identically positioned in the two operating positions with respect to machine frame 30 and thus also with respect to the axis of rotation A of the roller, so that the two operating positions are basically differentiated according to which of the scraper members are provided on the scraper bar 40 or are brought into scraping interaction with the roller 12.
It is evident that, because of the wedge-shaped design of the scraper member support 52, the first scraper member 56, on the one hand, and the second scraper members 64, on the other hand, are oriented at different angles of inclination but have the same direction of inclination with respect to roller 16 when, by corresponding positioning on or with scraper bar 40, they are in scraping interaction with roller 16. Therefore, the plate-like first scraper member 56, for example, in the first operating position, that is, when it or the first scraper region 58 is in scraping interaction with roller 16, is oriented at an angle of incidence of about 30° with respect to the outer peripheral region of roller 16. When positioned in the second operating position, that is, when the second scraper members 64 are positioned to engage between the rings of padfeet 28, they have an angle of incidence of approximately 47° with respect to roller 16 or with respect to a line running tangential to it. This angle of inclination for the two scraper regions 58, 66 can be specified for the respective scraper operation to be carried out, on the one hand, by means of the design of the wedge shape of the scraper member support 52 and, on the other hand, by the selection of the angle of inclination of the slots 72.
With the embodiment of the type shown in
If a conversion is to occur in the reverse order, that is, first working with a roller 16 having a textured outer peripheral region 26, then working with a roller 16 having an untextured outer peripheral region 26, the process described above can be carried out in the reverse sequence. The scraper bar 40 can be brought into its installation/removal position shown in
It should be noted that the embodiment of the scraper devices or of the scraper bar 40 described above may be varied in different ways. For example, the first scraper region 58 could thus be configured with a plurality of plate-like first scraper members 56 that, connecting directly to each other, provide a scraper edge 73 running essentially without interruption along the roller 16. The design and/or dimensioning of the second scraper members 64 can be adapted to the structure of the outer peripheral region 26.
In the embodiments of the ground preparation machine 10a shown in
The mounting plate 90a provides the first mounting region 54a on which a first scraper member 56a of the first scraper region 58a of plate-like or blade-like design may be attached by means of a plate-like support element 96a. The first scraper member 56a is secured by bolting it to the plate-like support element 96a, which in turn can be secured by bolting it to the mounting plate 90a. In the first scraper member 56a of plate-like or blade-like design, slots are provided that accommodate bolts used to secure it, so that it may be displaced with respect to the plate-like support element 96a away from or toward the scraper bar 40a and may be secured in various positions. Moreover, a diverter element 98a constructed of sheet metal, for example, is secured together with the first scraper member 56a to the plate-like support element 96a, using the bolt that also secures the first scraper member 56a to it, for example. The diverter element 98a extends from the attachment to the plate-like support element 96a away from roller 16a and covers the scraper bar 40a. This ensures that material detached from the outer peripheral region 26a of roller 16a by the first scraper member 56a does not accumulate in the region of the scraper bar 40a, but instead is carried away and can fall to the ground.
It is clear from
In
Because in each case only the first scraper member 58a or the second scraper members 64a, respectively, can be provided on the scraper bar 40a in the embodiment shown in
It is clear in each of
Basically, it should be noted that a scraper device or scraper bar designed according to the invention can also be used as basic equipment in a ground preparation machine that is not intended for switching between different states of the roller. Therefore, depending on the type of use, the first scraper member can be completely removed or the second scraper members can be removed if there is absolutely no need for them. Nevertheless, one and the same scraper bar in its basic configuration can be used for ground preparation machines of almost any configuration. It should also be noted that the texturing on the outer peripheral region of a roller does not necessarily have to be composed of padfeet. Other elements that result in texturing, such as cutters or other ground preparation tools, could also be provided on the outer periphery of such a roller.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2014 118 988.4 | Dec 2014 | DE | national |
