Refining element of a disc refiner

Details Refining element of a disc refiner Refining element of a disc refiner

1994-10-07

1996-06-18

Eley, Timothy V.

Solid material comminution or disintegration

Apparatus

Comminuting elements

2412612, B02C 706, B02C 712

Patent

active

055269923

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This present invention relates to a refining element for disk refiners. The present element invention also relates to such refining elements provided on their front side with working members for defibering and refining lignocellulose-containing fiber material. The refining element further is formed with through holes for attaching it on a holder in the refiner by means of screws.


BACKGROUND OF THE INVENTION

In using refining elements on such disk refiners, a plurality of such refining elements are attached to the refiner in the form of a ring about each of two opposed holders, which are rotary relative to each other. Both holders can be rotated in opposed directions, or one holder can be rotary and one stationary.
During refining, the material to be refined passes through the refining gap, which is formed between refining elements on the opposed holders. During said passage, the material is simultaneously worked. This working normally takes place during continuous operation under high pressure and temperature, whereby the working members on the front sides of the refining elements are subjected to wear. Due to such wear, the quality of the worked fiber material deteriorates, so that the refining elements must be exchanged after a certain period of time. This time can amount to several months.
During the necessary exchange of the refining elements, it has been found that the old elements have become so rigidly stuck, due to baked fibers and extracted substances, that they can be removed only with great trouble and after a long period of time. In many cases it is not sufficient to merely loosen the holding screws. Since the refining elements are fixed very tightly on the holder, there is no space for removing them by prying. In certain cases it has thus been necessary to knock off or cut to pieces one of the elements in order to be able to remove the elements, which moreover involves the risk of accidents. After one of the elements has been removed, it is then relatively simple to take off the remaining elements.


SUMMARY OF THE INVENTION

In accordance with the present invention, the aforementioned problems have now been solved by the invention of a refining element for use in a disk refiner having a refining element holder surface including a plurality of attachment holes thereon, the refining element comprising a front surface and a rear surface, the front surface including a plurality of working members and the rear surface adapted for attachment to the refining element holder, the refining element further comprising a plurality of attachment through holes extending through the refining element for attaching the refining element to the refining element holder at corresponding attachment holes therein, whereby attachments screws can be provided for affixing the refining element to the refining element holder through the plurality of attachment through holes, and at least one removal hole, the removal hole including threads and being substantially centrally located on the refining element whereby the refining element can be removed from the refining element holder by extending a removal member through the removal hole to apply pressure for removal of the refining element against the refining element holder.
In accordance with one embodiment of the refining element of the present invention, the plurality of working members on the front surface of the refining element comprise a plurality of bar members.
In accordance with another embodiment of the refining element of the present invention, a covering screw is provided for application to the removal hole for filling the removal hole during use of the refining element in the disk refiner.
In accordance with a preferred embodiment of the refining element of the present invention, the refining element can be removed from the refining element holder by removing the covering screw, and wherein the removal member comprises a removal screw having a length greater than the thickness of the refining element.
In accordance with another embo

REFERENCES:
patent: 25243 (1853-08-01), Brevoort
patent: 272642 (1904-10-01), Carr
patent: 2119768 (1938-06-01), Anthony
patent: 3459379 (1969-08-01), Brown
patent: 3910511 (1975-10-01), Leider et al.
patent: 4201350 (1980-05-01), Eagens
patent: 5383617 (1995-01-01), Deuchars

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