Metso Paper Inc.

Valmet Technologies Oy

Valmet Technologies, Inc.

Tommi Honkanen

Arvo Jonkka

Ari Havu

A disc chipper having a knife disc having a plurality of segments, each segment separated from an adjacent by a chip opening extending segment approximately in the radial direction of the knife disc between the inner and outer peripheries of the knife disc. The disc chipper further has at least one knife for each segment, located in the segment in the vicinity of the chip opening preceding it in the rotational direction and extending a distance axially from said knife disc and supported between two opposing surfaces. The disc chipper further includes at least one wedge element for each segment, adapted to adjust the position of at least one of the opposing surfaces relative to the knife disc, for setting the axial reach of said knife to a desired value. Characteristically, the wedge element is situated in the segment essentially at the end adjacent to the preceding chip opening.

Disc chipper with an adjustable knife

The present invention concerns an apparatus for receiving and feeding into a chipper wood to be chipped, said apparatus containing a feed conveyor receiving log bundles, a tumbling drum breaking the bundles, and a receiving conveyor. The feed conveyor is speed-controlled according to the position information of a log bundle, and the speed of rotation of the tumbling drum is adjusted depending on the amount of wood discharged from the drum. The position information of the log bundle is received for example from the torque moment or input power of the drives of the drum. Thereby the speed of the feed conveyor, respectively the rotation speed of the drum, is set to slow down as a result of the increasing toque moment or input power of the drum, respectively to speed up as a result of the decreasing torque moment or input power.

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Pori, Finland

Tommi Honkanen