Pelletizer

Details Pelletizer Pelletizer

2000-01-28

2001-07-17

Nguyen, Nam (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

C425S196000, C425S313000, C425SDIG002

Reexamination Certificate

active

06261078

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a pelletizer comprising a housing; a pelletizing hood; a knife head, which is disposed in the pelletizing hood; a rotatably drivable shaft mounted in the housing, which shaft has a central longitudinal axis in common with the knife head, and on the front of which the knife head is mounted non-rotatably and releasably.
2. Background Art
Prior public use discloses to fasten the knife head of a pelletizer by means of screws, which are screwed frontally into the shaft. Torque transmission takes place by means of a feather key or a splined shaft connection. Large pelletizers will need several feather keys for torque transmission, which reduces the carrying capacity of the shaft and the knife head. Further, mounting bulky and heavy parts is very complicated in large pelletizers. Accurate alignment of the shaft and the knife head relative to each other is necessary prior to the assembly. Automatization of replacement is rendered complicated and expensive by the use of screws.
SUMMARY OF THE INVENTION
It is an object of the invention to embody a pelletizer of the generic type such that mounting and dismounting the knife head is feasible rapidly and easily.
According to the invention, this object is attained in that the shaft and the knife head are coupled with each other non-rotatably by a denture coupling, which, on the knife head and on the shaft, respectively, comprises at least one serrated ring with a frontal tooth system, the frontal tooth systems being turned toward each other and inteimeshing; and in that a chucking arrangement of the type of a collet chuck is provided for releasably locking the knife head and the shaft in the direction of the axis. The measures according to the invention ensure simple mounting and dismounting of the knife head on the shaft. The knife head only has to be placed on the associated end of the shaft; the frontal tooth systems of the serrated rings, which are turned toward, and allocated to, each other, engage automatically with each other. Then only the chucking arrangement has to be operated for the knife head and the shaft to be clamped together in the direction of the axes, as a result of which the torque connection is simultaneously fixed between the knife head and the shaft, namely between the intermeshing frontal tooth systems of the serrated rings. Once the chucking arrangement has been released, the knife head can simply be detached. The frontal tooth systems have a surface which exceeds by far any feather key connection, ensuring high carrying capacity and important torque transmission.
Special advantages are offered by the use of a serration. An especially compact design is obtained when the chucking arrangement is disposed within the serrated rings. In the case of fluidic actuation of the chucking arrangement by the shaft, the chucking arrangement applies a gripping power which is precisely defined by the pressure of the pressure fluid and acts in the direction of the axis so that defects in assembling as they may be produced by not correctly tightened screws are avoided. This design further ensures automatic mounting and dismounting of the knife head; but it also facilitates the manual replacement of the knife head.
Details of the invention will become apparent from the ensuing description of an exemplary embodiment, taken in conjunction with the drawing.


REFERENCES:
patent: 5146831 (1992-09-01), Fetter, Jr. et al.
patent: 41 05 375A1 (1992-08-01), None
patent: 41 16 933A1 (1992-11-01), None
patent: 42 11 348A1 (1993-10-01), None
patent: 44 27 681A1 (1995-02-01), None
patent: 44 08 235 C1 (1995-02-01), None

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