Road structure – process – or apparatus – Process
Patent
1995-09-08
1997-12-09
Lisehora, James
Road structure, process, or apparatus
Process
404 8405, 404117, 40413305, E01C 1928
Patent
active
056952988
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is related to control of a vibrating compacting roller and similar devices for compacting or compressing a more or less dense material such as ground surfaces of the types earth or soil, road embankments, asphalt, etc, the term "ground" meaning a surface to be compacted, located underneath the compactor.
BACKGROUND OF THE INVENTION AND PRIOR ART
In compacting a ground material it is naturally desirable to have it performed as rapidly and as efficiently as possible. For a vibrating roller machine or another vibrating body contacting the ground different parameters may be varied for this purpose, in many cases most simply in the excitation imparting the vibrating movement to the roller. It is thus possible e.g. to increase the amplitude of the vibration by means of different devices coupled to an eccentrically arranged weight which in the common way produces the vibrating movement. Such a loaded and vibrating roller of a compacting roller machine can, in a hard operation with a large vibratory movement, enter undesired oscillating states such as double jumps (the roller is in contact with the ground only at every other stroke of the eccentric mass) and cradle oscillation (the axis of the roller is swung about swinging axis perpendicular to the roller axis, so that a hard blow or jolt is obtained in the area at one end of the roller only at every other stroke of the exciting, eccentrically arranged weight, and in the other strokes a hard blow or jolt is obtained in the area at the other end of the roller). In these undesired oscillating states even a disintegration of the ground material may take place.
There is thus a need of methods and devices for allowing the operation of e.g. a roller machine with an oscillating movement which is as large as possible, avoiding that the roller enters the undesired oscillating states mentioned above.
From the Swedish patent 8202103-1 for Dynapac Maskin AB (corresponds to U.S. Pat. No. 4,546,425 and DE-A1 33 08 436) it is previously known to control a vibrating roller machine so that the amplitude of the vibratory oscillations of the roller machine is increased continuously with a predetermined velocity, as long as the vibration movement of the roller machine is regular or as long as the irregularity of the vibration movement does not exceed selected amplitude values. In this patent it is not described, however, how the irregularity can be or is to be measured and evaluated. Signal sensors mounted to the roller or the frame of the roller generate signals and the difference of these signals or the deviation of these signals from a harmonic oscillating shape is fed to an amplitude adjusting device of an eccentric element exciting the vibratory movement of the roller drum. The continuous, smooth increase of the amplitude is interrupted when this difference or this deviation achieves some predetermined values. Then the exciting effect of the eccentric element is reduced so that the amplitude of the vibratory movement will continuously decrease somewhat, with a predetermined smooth velocity during a given time period, after which the excitation degree is increased again, so that the amplitude of the vibrating oscillations of the roller drum again will increase continuously, after which the procedure is repeated. In this patent it is not mentioned, as has already been indicated, anything on the matter how the regularity or the irregularity of the vibration movement of the roller can be measured or estimated.
Other methods for the control of a vibrating roller machine appear from U.S. Pat. Nos. 3,797,954 and 4,330,738, DE patent document 25 54 013 and GB patent document 1,372,567. The measurement of the amplitude of the vibrating movement and the compaction degree achieved are treated in U.S. Pat. No. 4,103,554 and the international patent application having publication number WO 82/01905.
DESCRIPTION OF THE INVENTION
It is a purpose of the invention to provide a method and a device for the control of a vibrating roller machine o
REFERENCES:
patent: Re31195 (1983-04-01), Thurner
patent: 4103554 (1978-08-01), Thurner
patent: 4330738 (1982-05-01), Paramythioti et al.
patent: 4467652 (1984-08-01), Sandstrom
patent: 4546425 (1985-10-01), Breitholtz
patent: 4734846 (1988-03-01), Konig
patent: 4870601 (1989-09-01), Sandstrom
patent: 5177415 (1993-01-01), Quibel et al.
Geodynamik H. Thurner AB
Lisehora James
LandOfFree
Control of a compacting machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control of a compacting machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control of a compacting machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1602576