Excavating – Rotary digger
Patent
1990-10-29
1992-03-17
Reese, Randolph A.
Excavating
Rotary digger
37195, 172604, 29894, 29894361, E02F 318
Patent
active
050956400
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of producing a bucket wheel body having a supporting body formed of a single sheet of metal with an approximately frustoconical cross section, particularly for use in open pit mining.
Federal Republic of Germany Patent 2,314,241 discloses a bucket wheel without cells having a conical supporting body which is rotatably mounted on the bucket wheel shaft and to which is fastened an annular body supporting the buckets. The supporting body is composed of a disc which can be produced by rolling in one process step. The essential drawbacks of this type of shaping are that outlines can be produced only in one direction, starting from the center of the bucket wheel so that, in order to provide the necessary stability, a number of welding procedures (application of reinforcements or the like) must be performed. This measure increases the overall weight of the bucket wheel body. Another drawback is the likewise expensive mounting of the buckets at the outer periphery of the bucket wheel body which must also be produced by welding.
Even if the basic body can already be produced in one process step, the still required work must be considered to be time and cost intensive, with welding work at the annular carrier and at the supports being difficultly accessible once the bucket wheel is completed. This produces problems during necessary repair measures so that the bucket wheel excavator must be shut down for a longer period of time.
SUMMARY OF THE INVENTION
It is the object of the invention to design a method of producing a bucket wheel body with which the expensive welding work can be reduced to a minimum without thereby adversely influencing the rigidity of the bucket wheel body. Moreover, a bucket wheel body is to be designed which can be produced easily and economically, with the still required welding work for possible repair purposes being better accessible.
This is accomplished with respect to the method in that the supporting body is shaped by deep drawing or hammering of the sheet metal; that an annular carrier to accommodate the buckets is shaped to the supporting body in its radially outer circumferential region when seen in the radial direction.
With the measures according to the invention, it is possible to produce a finished blank composed of the frustoconical supporting body and at least the shaped-on annular carrier. Welding work for shaping on the annular carrier can be avoided entirely. Compared to the prior art, a bucket wheel body is presented here which is not only significantly easier to manufacture but, moreover, lighter in weight and thus more economical.
Advantageous modifications of the features of the method according to the invention are described below.
A bucket wheel body having a conical supporting body is characterized in that supporting body, annular carrier and hub support are made in one piece. Advantageous features of the bucket wheel body according to the invention are set forth below.
Due to the geometrical shape of the bucket wheel body (S shape), the hub body which is configured as a disc having a central passage bore, can be connected without problems, with the outgoing region of the hub support and with the frustoconical region of the supporting body. Further supporting elements, as they are required in the prior art devices for reasons of rigidity, are not needed here.
The bucket wheel body can be produced by cold as well as hot shaping. The selection of the shaping process is here dependent on the respective size or power of the open pit mining equipment.
As already mentioned, the manufacturing process (rolling) employed in the prior art is able to produce only the frustoconical outline of the supporting body. The method steps according to the invention permit the problem-free shaping of radii required for further processing so that the welding work required at these locations in the past can be omitted entirely. The further construction of the bucket wheel body can be in modular form in that the carriers to acco
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Becker et al., "Umformen dicker Bleche" [Shaping of Thick Sheets], Werkstatt und Betrieb, vol. 112, No. 10, 1979, p. 714.
Zemann "Einfluss von Blechdickentoleranz und Werkzeugeinstellung auf das Ziehergebnis bei der Herstellung von Radscheiben" [The Influence of Sheet Thickness Tolerances and Tool Settings on Drawability in the Production of Wheel Discs], in Fertigungstechnik und Betrieb, vol. 26, No. 5, 1976, pp. 282-284.
O&K Orenstein & Koppel Aktiengesellschaft
Olsen Arlen L.
Reese Randolph A.
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