Abstract:
Un ébrancheur du type qui comprend un tambour (13) est monté de façon rotative dans lequel sont montés un certain nombre de dispositifs de traitement sert à traiter mécaniquement un groupe de troncs portant des branches afin d'ébrancher ces troncs, et, de préférence, de les introduire longitudinalement à travers le tambour. Chaque dispositif de traitement comprend au moins un élément rotatif (16, 17) monté du côté intérieur du tambour et tournant avec celui-ci. Cet élément rotatif comprend un ou plusieurs outils d'arrachage, de coupe et/ou de cisaillement, par exemple des vis (16, 17) qui servent à enlever les branches par arrachement, coupe et cisaillement, respectivement, pendant leur rotation par rapport au tambour.
Abstract:
A bundle limber of the type which comprises a rotatably mounted drum (13) within which a number of processing devices are mounted for mechanically processing a bundle of stems with twigs in order to limb and preferably also feed said stems longitudinally through the drum. Each processing device consists of at least one rotating member (16, 17) mounted on the inner side of the drum and accompanying the drum rotation. This rotating member comprises one or more tearing, cutting and/or shearing tools, for example screw (16, 17), adapted to remove, during rotation relative to the drum, the twigs by tearing, cutting and shearing, respectively.
Abstract:
A bundle limber of the type which comprises a rotatably mounted drum (13) within which a number of processing devices are mounted for mechanically processing a bundle of stems with twigs in order to limb and preferably also feed said stems longitudinally through the drum. Each processing device consists of at least one rotating member (16, 17) mounted on the inner side of the drum and accompanying the drum rotation. This rotating member comprises one or more tearing, cutting and/or shearing tools, for example screw (16, 17), adapted to remove, during rotation relative to the drum, the twigs by tearing, cutting and shearing, respectively.
Abstract:
A method for optimizing the debarking result of logs debarked in a debarking drum, especially logs of mutually approximately the same size and of the same wood species, in such a way that wood losses remain as small as possible at the same time as the control values of the debarking drum are selected to be such that the debarking degree of the logs debarked in the debarking drum is of the desired order. The amount of bark remaining on the logs in the log flow discharged from the debarking drum and the amount of damaged logs in the said log flow are measured. At the same time as the amount of bark remaining on the logs is maintained at a desired level, the amount of damaged logs is kept as low as possible in such a way that the filling degree of the debarking drum is lowered whenever the amount of damaged logs is observed to increase.
Abstract:
The invention relates to a method and apparatus for measuring the degree of fullness of a pulpwood barking drum. The supply end of a drum (1) is illuminated with a light fixture (2), and a camera (3) is used for imaging through the drum. A dark area (4) visible in the image is interpreted as a pulpwood -loaded section of the drum, and an area (5) visible in illumination is interpreted as a void space. Thus obtained is true degree-of-fullness information regarding the drum, and a consistent degree of fullness can be maintained.
Abstract:
The present invention concerns an apparatus for receiving and feeding into a chipper wood to be chipped, said apparatus comprising a feed conveyor (12) receiving log bundles (1'), a tumbling drum (13) breaking the bundles, and a receiving conveyor (7'). The feed conveyor (12) is speed-controlled according to the position information of a log bundle (1'), and the speed of rotation of the tumbling d rum (13) 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.