Road structure – process – or apparatus – Apparatus – With in situ means for both comminuting and treating – e.g.,...
Patent
1997-11-07
1999-04-13
Bagnell, David J.
Road structure, process, or apparatus
Apparatus
With in situ means for both comminuting and treating, e.g.,...
404 92, 299 394, 299 396, E01C 2308, E21C 4700
Patent
active
058936777
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to an automotive working machine for the treatment of roadways.
Such working machines are used for the treatment of road material, e.g., for stabilization of ground having insufficient bearing properties, the fragmentation of hard asphalt surfacing, and for the recycling of bound or non-bound road surfaces.
Known machines of the above type are characterized by usually one working drum rotating in a working chamber and being arranged to have its height and inclination adjusted in conformity with the surface to be treated.
The required processes, e.g. the breaking and fragmenting of the milled-off road material, the adding of binding agents, the mixing and distributing of added materials and the like, will take place in said working chamber.
The inventive working process can also be divided into a counter-rotational working process and a co-rotational working process, depending on whether--with the same rotational direction--the peripheral force of the working drum will act against the driving force of the machine or will support it. Because of their relatively wide range of applications, especially in working processes wherein binding agents such as lime or cement are mixed partly in loose form with the surface layer to be treated, such machine are often provided with a closed driver's cabin so as to comply with working safety requirements.
The above described working machines for the refurbishing of roadways comprise a working drum driven either on one or both sides, and a very high drive power may be required depending on the respective application, with the rotational speed of the working drum being adjustable. Since the working process is often performed in the immediate vicinity of lateral obstacles, e.g. embankments, curbs, trees, house walls and so on, difficulties often occur because the slightest possible distance has to be kept between the outer cutting edge of the working drum and the outer edge of the machine in the working range.
The working chamber, extending between the working drum and the outer cover, is of special importance for the result of the working process. The work achieved could be improved, e.g., by an enlarged working chamber having a larger working depth. In known machines, the positions of the working drum axis relative to the drive carriage axes are quite different. Extensive research has revealed that the position of the working drum axis relative to the drive carriage axis is of particular relevance for the detachment behavior. The working machines, usually provided with two drive carriage axes, require considerable pressing forces to obtain the detachment behavior of the working drum, the maximum possible pressing force being determined by the weight of the machine. The arrangement of the working drum is favorable when, if feasible, the whole machine weight can be used in counter-rotational and co-rotational working processes for generating the possibly required pressing forces of the working drum. The outer cover is fixedly arranged on the machine frame. The fixed arrangement is usually advantageous because of its low constructional expenditure (no necessity for guide elements). For the working result, the particle size and resp. the particle distribution of the detached and resp. also picked-up material is of eminent importance. The distribution of the particle sizes is decisively influenced by the geometrical configuration of the working chamber which is determined by defined geometrical relationships between the working drum and the outer cover. Particularly an outer cover which is resistant to mechanical stresses will provide advantageous working results.
The driver's platform, which for safety reasons is imperative in machines of the above type, poses problems due to the resultant increased height of the machine, which is disadvantageous especially during transport of the machine. For this reason, the driver's platform of the known embodiments has been arranged at the rear or the front of the machine which
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Busley Peter
Haehn Guenter
Simons Dieter
Bagnell David J.
Singh Sunil
Wirtgen GmbH
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