Grinding segment and grinder stone
AssigneeMetso Paper, Inc.
InventorOlli Tuovinen
Life of this patent
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Abstract
The invention relates to a grinding segment comprising a ceramic part manufactured of grinding ceramic material and provided with a fastening hole, through which the grinding segment is attached to a frame of a grinder stone by means of a fastening bolt. A fastening sleeve is arranged in the fastening hole, and the fastening bolt is supplied through the sleeve. The fastening sleeve is pressed against the frame of the grinder stone due to the fastening force. A space filled with bonding agent is formed between the ceramic part of the fastening sleeve to join them together. The invention further relates to a grinder stone comprising a cylindrical frame and grinding segments according to the invention.
Claims11
A grinding segment comprising a ceramic part manufactured of grinding ceramic material, at least one fastening hole formed in the ceramic part for fastening the grinding segment by means of a fastening element to the outer surface frame of a grinder stone used in defibering of wood, fastening sleeve arranged in the fastening hole, and a layer of bonding agent formed between the fastening sleeve and the ceramic part to join them together, the fastening element being arranged to press the fastening sleeve to the frame of the grinder stone, wherein a predetermined proportion of the ceramic part of the grinding segment is impregnated with bonding agent beginning from the bottom of the segment towards the grinding surface thereof.
A grinder stone for defibering wood, comprising a cylindrical frame, grinding segments made of grinding ceramic material and arranged on the frame's outer circumference, each grinding segment being fastened to the frame by a fastening element extending through a fastening hole defined by the respective grinding segment, and a shaft around which the grinder stone is arranged to be rotated during grinding, each grinding segment comprising a fastening sleeve disposed within the fastening hole, wherein the fastening element is configured to secure the fastening sleeve to the frame of the grinder stone, and wherein a bonding agent is inserted between the fastening sleeve and a surface of the grinding segment defining the fastening hole so as to secure the fastening sleeve within the fastening hole.
Dependencies are inferred from the claim text.