Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Clamped tooth holder or tooth mount
Patent
1995-05-26
1996-11-12
Bagnell, David J.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Clamped tooth holder or tooth mount
299 871, E21C 35193
Patent
active
055733085
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a cylindrical cutting element for a coal cutting machine with a reamer-conveyor worm or reamer spiral, disposed projecting at a distance from the surface of the cutting element and made of base elements attached at uniform distances. A chisel holder with an exchangeable chisel is connected to each base element. The chisel holder is inserted with its plug-in connector into a socket of the base element and is maintained therein by a pressure screw.
2. Description of Prior Art
A cutting element of this type is taught by German reference DE 92 11 739 U1. It is necessary to prepare a welding template which is positioned and fastened on the surface of the cutting element. The positions of the individual base parts as well as their alignment on the cutting element are marked. The base parts can then be held and welded on in sequence, so that the reamer-conveyor worm or reamer spiral is produced.
This method is very time-consuming, because it is necessary to produce an individual welding template and to apply it very exactly to the cylindrical cutting element. There is often the danger that the template is placed with insufficient accuracy or that the individual base parts are inaccurately placed for being welded together. This leads to an unsatisfactory geometry of the reamer-conveyor worm or reamer spiral and results in a reduction of the quality of the surfaces milled by the coal cutting machine. Furthermore, the service life of the cutting element is greatly reduced by inexpertly applied base parts, because the forces transmitted through the chisel are not guided through the support surfaces provided, so that the chisel holder is more easily torn off.
SUMMARY OF THE INVENTION
It is an object of this invention to produce a cutting element of the previously mentioned type which provides for a time-saving and precise assembly of the components in a simple way.
This object of this invention is attained by a cutting element having receiver pockets cut along the reamer-conveyor worm or reamer spiral at uniform distances into the surface of the cutting element. The undersides of the base elements end in a base whose cross section is matched to the receiver pockets. The base elements are introduced, positioned by the base, into the receiver pockets and are fixedly connected therewith.
The individual base elements are disposed directly on the cutting element in the prescribed position by means of the receiver pockets and are fastened thereon. Such a procedure for producing a cutting element can be performed by a single person in a time-saving manner and with great accuracy.
In accordance with one embodiment of the cutting element of this invention, the base parts are supported by the undersides of their bases on support surfaces of the receiver pockets. With this type of support, it is possible to absorb very large forces acting normally in relation to the surface of the cutting element.
In accordance with another embodiment of this invention, the base elements are inserted into the receiver pockets until they contact the surface of the cutting element. In this case, the base element has a base which tapers in cross section. In this way, a shoulder is formed by which the base element is easily introduced from above into the receiver pocket.
In accordance with one embodiment of this invention, the accurate positioning of the base elements is provided where the receiver pockets are open in the back, viewed in the movement direction, and the base elements can be slid in the movement direction of the cutting element until they contact the faces of the receiver pockets which are in front, viewed in the movement direction.
The base element in accordance with one embodiment is welded to the cutting element. In accordance with another embodiment, threaded receivers are cut into the cutting element, into which fastening screws can be inserted for fixing the base element in place.
The chisels can be placed very closely together in accordance with
REFERENCES:
patent: 3695726 (1972-10-01), Krekeler
patent: 4068897 (1978-01-01), Amoroso
patent: 5322351 (1994-06-01), Lent
Holl Bernd
Simons Dieter
Bagnell David J.
Wirtgen GmbH
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