Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Reexamination Certificate
1999-02-18
2001-10-02
Bagnell, David (Department: 3673)
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
C299S039100, C299S064000, C404S090000, C198S300000
Reexamination Certificate
active
06296318
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a device for milling off ground surfaces, especially roadways.
Such devices are also called front-loading milling cutters. Such a front-loading milling cutter is known, for example, from DE 39 03 482 A1. The known milling machines comprise an automotive wheel frame comprising a pair of front wheels and a pair of rear wheels. The wheel frame carries a machine frame in which a milling roller is supported transversely to the direction of travel. To achieve as complete a removal as possible of the milled material, the milling roller is usually surrounded by a housing in which the wall directed towards the direction of travel is formed as a cover plate having a passage opening for the milled material. The material taken off by the milling roller is discharged by the milling roller onto a first transport belt transferring the milled material, on the frontal end of the milling cutter, onto a discharge belt being pivotable in inclination and laterally for a transport onto a loading area of a truck.
The milling roller is equipped with chipping tools forming a conveyor coil transporting the milled material to the passage opening of the cover plate.
The first transport belt in front of the milling roller can easily be damaged by breaking ground plates, making it necessary to dismantle the conveyor means for repairing the transport belt. Dismantling and assembling the conveyor means is very labor-intensive and time-consuming. Furthermore, several people are required to perform these operations.
Thus, what is needed then is a device of the kind mentioned above so that the conveyor means is better protected against damages, on the one hand, and can be dismantled and assembled with as little use of personnel and time as possible.
SUMMARY OF THE INVENTION
The invention advantageously provides that the end of the conveyor means proximate to the milling roller is supported, in an easily detachable way, in a belt shoe being arranged, in a height-adjustable manner, on the machine frame and that the belt shoe and the conveyor means comprise guiding and coupling means adapted to each other. The belt shoe, approximately L-shaped in the longitudinal section thereof, comprises a readily dismountable support for the rear end of the conveyor means and thereby enables substantially shortened assembly and dismounting times for the conveyor means during repair work. Furthermore, the conveyor veyor means is better protected against damages towards the ground surface and the milling roller so that less repair work occurs. The essential advantages of the belt shoe consist in the protection of the conveyor means from damages, on the one hand, and the integrated guidance of the lower end of the conveyor means, on the other hand. The belt shoe protects both from damages to the transport belt of the conveyor means from below and from damages to the transport belt by means of the charged milled material, by the belt shoe preventing milled fragments from getting between the conveyor belt and the cover plate and damaging the conveyor belt at the rerouting position of the conveyor belt.
The belt shoe comprises a vertical wall element having a passage opening, a grate horizontally projecting on the lower end of the wall element in the direction of travel as well as lateral walls projecting upwards, extending parallel to the direction of travel and enclosing the grate, the end of the conveyor means on the side of the milling roller being supported pivotably therebetween. While the vertical wall element of the belt shoe functions as a vertical shield, the grate serves as a supporting, sliding and holding-down element abutting on the bottom surface. The lateral walls allow for guiding and supporting the rear end, on the side of the milling roller, of the conveyor means. The conveyor means is supported pivotably between the lateral walls of the belt shoe.
A passage opening in a vertical wall element of the belt shoe co-operates with the passage opening of the cover plate. The passage opening of the belt shoe being able to be height-adjusted relative to the depth of milling is always arranged in the same position relative to the conveyor means so that optimum conditions are present for removing the milled material by the conveyor means.
The guiding and coupling means of the conveyor means comprise, for example, laterally projecting guide bolts allowing for a pivotability of the conveyor means.
The conveyor means can extend upwards at an angle of inclination to the horizontal line, the guiding means of the belt shoe on the lateral walls comprising guiding elements extending at the angle of inclination of the conveyor means. The guiding means of the belt shoe thus forms a prolongation of the guiding means of the machine frame for the conveyor means.
It is preferably provided that the lateral walls on the end, on the side of the milling roller, of the guiding elements comprise reception means for the guide bolts of the guiding means in which the guide bolts are lockable and simultaneously serve as a limit stopper for the conveyor means. Thus, the belt shoe simultaneously serves as a guiding and locking means.
As an alternative, the conveyor means can be guided and supported movably in the belt shoe and be biased against the stopper on the belt shoe towards the milling roller. For this purpose, the belt shoe comprises a longitudinal support.
In a preferred embodiment, the guiding elements of the lateral walls comprise a guide surface, on the upper edge of the lateral walls, extending at the angle of inclination of the conveyor means. The guide bolts of the conveyor means can slide on these guide surfaces into the stopping and locking position on the belt shoe. On the other hand, the guide surfaces on the belt shoe protect the rear end of the conveyor means when it is pulled out of the machine frame until the conveyor means is sufficiently supported by the machine frame.
As an alternative, the guiding elements on the lateral walls can comprise rails or grooves adapted to the guide bolts of the conveyor means and extending at the angle of inclination of the conveyor means.
The machine frame comprises a shaft extending at the angle of inclination of the conveyor means, in which the conveyor means can be inserted into the end support by means of a pairing of rails and rolls. The rails are preferably arranged on the shaft of the machine frame, and the guiding rolls are arranged on the conveyor means.
It is especially preferred to use the axially exterior areas of the support rollers for the lower run of a transport belt of the conveyor means simultaneously as guiding rolls for the conveyor means.
In this context, the supporting rolls and the guiding rolls, respectively, do not abut on the guiding rails in the shaft of the machine frame in the end position of the conveyor means in the belt shoe.
The belt shoe comprises, on the frontal side thereof, a shield in the shape of the bow of a ship, protecting the belt shoe from damage.
Stiffening ribs extending transversely to the lateral walls can be provided in the belt shoe, providing the belt shoe with a high stability and connecting the grate bars of the grate with one another.
The conveyor means comprises two further laterally projecting guide bolts on the frontal end thereof averted from the milling roller, which bolts are insertable in the shaft into a longitudinal support when the guiding means is inserted in the belt shoe. In this process, the conveyor means is raised so that the guiding rolls of the conveyor means no longer abut on the guiding rails in the shaft of the machine frame. The longitudinal support also allows for a limited movement of the conveyor means, for example when the conveyor means is supported by means of a tension spring against a stopper in the belt shoe or when the conveyor means is adjusted due to an adjustment of the depth of milling.
REFERENCES:
patent: 4184581 (1980-01-01), Crawshay et al.
patent: 5441361 (1995-08-01), Campbell
patent: 37 33 644 A1 (1989-04-01), None
patent: 38 31 161 C1 (1990-02-
Busley Peter
Ley Herbert
Simons Dieter
Bagnell David
Kreck John
Shouse Emily A.
Waddey & Patterson
Wirtgen GmbH
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