Patent Application
20080093149
The invention relates to construction machinery in accordance with the pre-characterizing clause of claim 1, as well as a pivoting device in accordance with claim 14.
Such construction machinery is known, for instance, from U.S. Pat. No. 4,029,165. In such construction machinery, the machine frame is supported by a chassis with several wheels or crawler track units that are coupled with the machine frame via lifting columns. The lower part of the lifting column is extendable in order to raise the machine frame to a pre-determined plane. Each lifting column can be adjusted in height individually or together with other lifting columns. The machine frame shows a width that is suitable for transport on a transport vehicle. In longitudinal direction, the machine frame shows a length that is a multiple of the width.
In the known construction machine, the swivel support of each crawler track unit is mounted coaxially below one lifting column, with a slewing ring being arranged at the crawler track unit that enables steering of the crawler track unit by means of a steering cylinder which supports itself at the machine frame. Several articulated brackets are provided at the slewing ring which make it possible, by way of remounting the steering cylinder to other articulated brackets, to swivel a crawler track unit from a transport position parallel to the longitudinal direction of the machine frame to a working position transverse to the longitudinal direction in several work steps.
In transport position, the construction machine is capable of being driven from a transport vehicle and of being steered, whereas in working position, the machine is capable of bridging a carriageway width of up to, for instance, 18 m depending on the length of the machine frame.
Of disadvantage in this design are the great installation effort required on all crawler track units and the risk of accident and injury during the installation work.
The installation effort is caused by the fact that the steering cylinder is suitable for enabling a swivelling angle of approx. 45° only. Additional articulated brackets must therefore be provided at the slewing ring in order to enable the steering cylinder to be remounted for further swivelling of the crawler track unit and to enable it to be coupled to a different articulated bracket. In the process, it causes difficulty to bring the piston rod of the steering cylinder into an aligned position with a different articulated bracket at the slewing ring for the purpose of articulated locking.
In a different embodiment without additional articulated brackets, a coupling rod enables the steering function of the crawler track unit in transport position to be transmitted to the crawler track unit arranged on the other side of the machine frame.
The purpose of the invention is to further develop a construction machine of the type mentioned at the start, as well as a pivoting device, in such a manner that both the steering movement in transport position and the swivelling movement from transport position to working position and vice versa can be effected by way of a swivel gear without requiring any remounting work.
The characteristics of claims 1 and 14 respectively serve to provide a solution to this purpose.
The invention provides in an advantageous manner that the consoles of two adjacent lifting columns are coupled, by way of spaced articulations each, with the machine frame on the one hand and with a coupling rod on the other hand. The mutual distance of the articulations on a console of a lifting column is of such a length as to enable the console with the wheel or crawler track unit to be swivelled in excess of 90°. Alternatively, the coupling rod may not run in a straight line between the articulations facing the coupling rod but may, for instance, be shaped in a horizontal plane in such a manner that the collision-free maximum swivelling angle is increased. The distance of the articulations or the shape of the coupling rod respectively are such that, when swivelling and in particular in the limit positions of the swivel gear, the coupling rod maintains a distance to the articulations facing the machine frame and/or to the lifting columns over a swivelling range in excess of 90°, starting from the working position. Both the steering movement in transport position and the swivelling movement from transport position to working position and back are effected by the swivel gear. The invention enables the wheels or crawler track units of a construction machine to be transferred from a working position to a transport position and vice versa and to steer the wheels or crawler track units in transport position without requiring remounting or installation work.
Since the installation work is dispensed with, the time required for re-setting the machine from working position to transport position and vice versa is reduced considerably, and the accident hazards resulting from the installation work are eliminated.
The consoles of the wheels or crawler track units may be attached to the fixed upper part of the lifting column in a non-rotatable manner. The arrangement of the consoles at the upper part of the lifting columns offers the advantage that the swivel gear can be arranged at a large distance from the ground surface so as not to be soiled by the ground or the material to be processed. The operational safety of the pivoting device is thus increased.
Each of the consoles provided at the lifting columns accommodates two articulations that show a pre-determined identical horizontal distance to one another. The identical centre-to-centre distance of the articulations enables the consoles to be guided in a parallelogram-type manner.
The swivel gear has a maximum swivelling angle in excess of 90° and up to 120°, preferably 105°, starting from the working position. This means that the swivel gear is capable of initially swivelling the wheel or crawler track unit by 90°, starting from the working position, until the transport position has been reached, and then further to, for instance, maximum 120° for the purpose of setting a steering angle of +/−30° relative to the direction of travel.
When doing so, the swivel gear has a steering angle in transport position of +15° to +30° to one side until a maximum total swivelling angle of 105° to 120° has been reached. It is understood that in the opposite direction, towards the working position, the steering angle is not limited but can be set to up to −90° (working position).
The manoeuverability of the construction machine in transport position is improved especially due to the fact that the front or rear crawler track units in transport position are capable of being swivelled in the same or alternatively in the opposite swivelling direction. According to a further alternative, the rear crawler track units may remain in the working position while the front crawler track units only are in transport position with or without the steering angle deviating from 0°.
The articulations facing the machine frame are arranged in crossbeams of the machine frame, the said crossbeams running parallel to the direction of travel when in working position. The coupling rod runs essentially parallel to the corresponding crossbeam of the machine frame and transverse to the direction of travel when in transport position.
A preferred embodiment provides that several consoles are provided at each lifting column with a mutual vertical distance, the said consoles accommodating between them the coupling rod and/or a drive unit for the swivel gear in an articulated manner. The multiple arrangement of the consoles enables the coupling rod and the drive for the swivel gear to be mounted in a rigid manner, with the said drive preferably consisting of a piston cylinder unit.
The lower, extendable part of the lifting columns is preferably arranged in a non-rotatable manner relative to the upper part of the lifting columns. This can be achieved, for instance, by means of a square cross-sectional shape or else by a sliding block that runs in grooves between the two parts of the lifting column. Such a lifting column increases the driving stability and in particular the track precision of the construction machine.
The vertical axes of the adjacent lifting columns when seen in transverse direction of the machine frame show identical distances, in opposite directions, relative to the axes of the corresponding articulations of the console that face the machine frame. The distance of the vertical axes of the lifting columns is thus increased, in particular in the working position, which provides the machine with increased stability when in the working position.
When in working position, the vertical axes of the adjacent lifting columns when seen in the direction of travel may differ in distance from the axes of the corresponding articulations facing the coupling rod. In this way, the coupling rod may be arranged in a parallelogram-type manner, thus enabling the swivel gear to effect a steering movement when in transport position.
It may also be provided in an alternative embodiment that the vertical axis of the lifting columns is coaxial to the axis of the corresponding articulation facing the machine frame. This can be achieved, for instance, by the crossbeam of the machine frame enclosing the lifting column while forming a swivel joint. The cross-section of the lifting column then has a preferably circular shape.
The running direction of the wheels or crawler track units respectively is maintained while swivelling the wheels or crawler track units from transport position into working position and vice versa.
The construction machine preferably is a road construction machine, in particular a slipform paver or a texture curing machine.
In the following, embodiments of the invention are explained in more detail with reference to the drawings:
The machine frame 2 shows a width that is suitable for transport on a transport vehicle so that the machine can be transported to the job location by road on the transport vehicle. In longitudinal direction of the machine frame 2, the machine frame may show a length that is a multiple of the width by enabling, for instance, the insertion of widening elements or telescoping of the machine frame.
A carriageway width of, for instance, up to 18 m can thereby be bridged in the working position that is shown in
The construction machine 1 shows a chassis with several wheels and/or crawler track units 4 that support the machine frame 2 in a height-adjustable manner via lifting columns 8.
The wheels or crawler track units 4 can be transferred from a working position 7 as shown in
The swivel gear 14 used for swivelling the crawler track units 4 shown in the figures can effect both the swivelling movement from the working position to the transport position and vice versa, as well as the steering movement in transport position.
The transport position depicted in
The steering movement in transport position can be seen in
As a swivel gear 14 is provided on both transverse sides of the machine frame 2, it is understood that the crawler track units 4 on the short sides of the machine frame 2 can be swivelled in the same direction and also in opposite directions for the purpose of steering in transport position. It is, in particular, also possible to also leave the rear crawler track units when seen in the direction of travel 60 in the working position.
The swivel gear 14, which is suitable for coupling to a machine frame 2, consists of the elements described in the following.
Consoles 10, 11 are attached in a non-rotatable manner to the upper parts 8a of the lifting columns 8 in the form of articulated carrier plates.
The consoles 10, 11 show two articulations each 20, 24; 22, 26 that are coupled on the one hand with the machine frame 2 and on the other hand with a coupling rod 18, where the said coupling rod 18 runs essentially parallel to crossbeams 28 of the machine frame 2.
The mutual distance of the articulations 20, 24 and 22, 26 is of such a length as to enable the consoles 10, 11 to be swivelled in excess of 90°. The coupling rod 18 and the differently designed consoles 10, 11 form a parallelogram guide of the crawler track units 4 in such a manner that, for instance, a drive unit 30 coupled to the articulation 24 facing the coupling rod can simultaneously swivel both adjacent crawler track units 4. The coupling rod may be adjustable with regard to its length for the purpose of adjusting the steering angles at the lifting columns coupled with the coupling rod.
Apart from choosing a sufficient mutual distance of the articulations on the consoles 10, 11, a collision-free swivelling angle of 120° can also be achieved in that the coupling rod 18 does not run in a straight line between the articulations 24, 26 facing the coupling rod in, for instance, a horizontal plane but is, for instance, bent or angular as can be seen, for instance, in
Irrespective of the different designs of the consoles 10 and 11, the articulations 20, 22 facing the machine frame have an identical distance to the articulations 24, 26 facing the coupling rod.
Of importance is also the distance of the lifting columns 8 from the articulations 20, 22 facing the machine frame. A larger distance can increase the collision-free maximum swivelling angle. Recesses at the crossbeams 28a, 28b can additionally increase the maximum swivelling angle by accommodating the lifting columns 8.
As explained previously and as can be seen from
The drive unit 30 preferably consists of a piston cylinder unit, where the piston rod is coupled with the articulation 24. The cylinder is articulated at the machine frame 2, for instance, at a connecting flange 34 projecting from the crossbeams 28a,b, in an articulated manner via an articulation 32. The piston cylinder unit runs in the limit positions of the swivel gear, as they can be seen in
The lifting columns 8 have a square cross-section so that the lower part 8b is secured against twisting vis-à-vis the upper part 8a of the lifting column 8. It is understood that the lifting columns 8 may also have a circular cross-section that is secured against twisting by some other means.
Furthermore, a step-on platform 21 can be seen in
It can be seen from
Only two consoles 11 are provided at the adjacent lifting column 8, the said consoles 11 accommodating between them the other end of the coupling rod 18 at the articulation 26. A further console in the shape of the consoles 10 is arranged below the consoles 11 which, together with the consoles 11 and the crossbeams 28a, 28b, accommodates the articulation 22.
The crossbeam 28 consists of an upper part 28a and a lower part 28b which runs parallel to it at a vertical distance, with the articulations 20, 22 extending through their corresponding ends.
The hydraulic drives 38 of the crawler track units are arranged in such a manner that the lower return side of the track chain is subject to tensile stress. The running direction of the crawler track units 4 is maintained during swivelling so that remounting work relating to the rotating direction of the hydraulic drive motors is not required.
It is preferably provided that the axes of the articulations 20, 22 intersect the weight-loaded horizontal axis 52 of the crawler track unit 4. As can be seen in
When the crawler track units 4 are in working position, steering in accordance with the course of the road can be achieved by different propulsion of the crawler track units 4 that are arranged on both sides of the road.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102005003739.9 | Jan 2005 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP06/50478 | 1/26/2006 | WO | 7/24/2007 |
