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 (11) manufactured of grinding ceramic material and provided with a fastening hole (12), through which the grinding segment (10) is attached to a frame (9) of a grinder stone by means of a fastening bolt. A fastening sleeve (14) 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 and the fastening sleeve to join them together. The invention further relates to a grinder stone comprising a cylindrical frame (9) and grinding segments (10) according to the invention.
Claims10
A grinding segment comprising a ceramic part (11) manufactured of grinding ceramic material, at least one fastening hole (12) formed in the ceramic part for fastening the grinding segment by means of a fastening element (13) to the outer surface of a frame (9) of a grinder stone used in defibering of wood, characterized in that a fastening sleeve (14) is arranged in the fastening hole (12), that a layer (16) of bonding agent is formed between the fastening sleeve and the ceramic part to join them together, and that the fastening element is arranged to press the fastening sleeve to the frame of the grinder stone.
A grinding segment according to any one of the preceding claims, characterized in that the bottom of the grinding segment in the area of the ceramic part (11) is provided with an intermediate layer (20) of bonding agent arranged to remain between the frame (9) of the grinder stone and the ceramic part (11) of the grinding segment when the segment is installed in place.
A grinding segment according to any one of the preceding claims, characterized in that at least some of the sides of the grinding segment, transverse to a grinding surface (30), are provided with side layers (21) of bonding agent, which are arranged to be disposed towards adjacent grinding segments when the segment is in place in the grinder stone.
A grinding segment according to any one of the preceding claims, characterized in that 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 (30) thereof.
A grinding segment according to any one of the preceding claims, characterized in that the bonding agent is reinforced with fibre.
A grinder stone for defibering wood, comprising a cylindrical frame (9), grinding segments (10) made of grinding ceramic material, arranged on the frame's outer circumference and fastened in place by means of a fastening element (13) arranged through at least one fastening hole (12) formed in the segments, and a shaft (8), around which the grinder stone is arranged to be rotated during grinding, characterized in that each grinding segment comprises a fastening sleeve (14) in connection with the fastening hole, that the fastening element is arranged to press the fastening sleeve to the frame (9) of the stone, and that a layer of bonding agent (16) is formed between the fastening sleeve and the ceramic part to join them together.
Dependencies are inferred from the claim text.