FI111914B - Device for barking or pretreatment for barking of trees - Google Patents

Description

111914

Apparatus for stripping or pre-treatment of trees for stripping

The invention relates to a device for barking or pre-treating trees, in particular hard-to-peel trees, which comprises a bark release unit for removing the bark from a tree and a bark separator unit for separating the removed bark from the debarked trees, the trees to be processed through the space limited by the cylindrical inner shell of the drum are subjected to 10 transverse rubbing, incisions and shocks with the inner drum inner shell and the inwardly projecting processing means to cut and remove the bark, .

15 It is important for the quality of the cellulose to keep the bark of the trees to be chipped to a minimum. Removal of the bark from the surface of the trees usually takes place in the bark drum, where the mutual movement of the trees and the rubbing together cause the bark to come off. The loose, finely crushed shell falls mainly through the drum shell openings to the shell conveyor under the hub.

• a: · 'In some species of wood, the bark comes off as long strips or large sheets, removing * a a; ·; the nut bark tends to come out of the bark drum discharge end with the trees.

The bark may also be very tightly closed, which will result in slow peeling in a conventional peel-drum. Many hardwoods such as eucalyptus, acacia, hickory and birch can be such a difficult bark.

Various methods and devices have been developed for the treatment of such hard-to-peel trees, which allow the bark to be cut into short sections of less than 30 cm. However, the problem often remains that, as such, it is possible; the loosened bark is mixed among the trees.

> · 2 111914

It is a further object of the invention to provide an apparatus for debarking or pre-treating trees, in particular hard-to-peel trees, for the effective debarking, so that separation of the bark from the stream of wood and bark material is effected.

5

The device according to the invention is characterized in that the housing separating unit is formed by a roller set consisting of a plurality of rotatable rollers arranged as an extension of the inner shell of the drum, the rollers being bearing such that their axis of rotation is substantially parallel to the central axis of the drum.

10

It is known in the art to use various rollers and devices for separating trees and bark. One such roller skate is disclosed, for example, in WO98 / 25743 (Andritz-Patentverwaltungs-GmbH).

By means of the device according to the invention, the operation of such bark separator units is substantially enhanced when they are placed immediately in connection with the bark separator unit, whereby the vibration movement of the trees in the bark separator unit still acts on the separator unit and causes the bark to fall directly on or below

20

In a preferred embodiment of the invention, it is arranged that:; the device comprises a separation unit arranged in a tree moving motion; ·; in the direction immediately before the shell removal unit. Such a separation unit can be used especially when the tree bark has already been partially removed, * · ·; ]: 25 whereby the vibration movement caused by the release unit may separate the bark from the wood even before the wood has been completely exposed to the release unit.

In order to achieve the desired end result in terms of shell removal and separation. '! in a preferred embodiment of the invention, the device 30 comprises at least one unit formed of at least one separation unit and at least one separation unit through which the trees are arranged to pass. By adjusting the required number of units in succession, this arrangement allows the shell removal and separation steps to be repeated until the desired end result is obtained.

The invention will now be further described with reference to the accompanying drawings, in which:

Figure 1 shows a perspective view of the device according to the invention.

Figure 2 shows a side view of the device according to the invention.

10

Figure 3 is a sectional view taken along line III-III of Figure 1.

Fig. 4 shows a blade protruding from the inside of the drum.

Figure 5 is a sectional view taken along line V-V of Figure 4.

A device for peeling or pre-treating trees, particularly hard-to-peel trees, is shown schematically in perspective in Figure 1. The device is illustrated at the discharge end 20. Fig. 2 is a side elevational view, in which the feeding direction of the trees is indicated by an arrow A. Fig. 3 further shows a section along Fig. 2; · 'Dashes lll-lll.

• · ·

The apparatus includes a bark detaching unit 3 in which the trees to be treated 1 are subjected to transverse movements with respect to the propagation direction of the trees by abrasion, incisions and shocks to cut and detach the bark, and a bark separating unit 30 disposed immediately in the direction of

In the example of the drawing, the release unit is formed by a drum 3 rotating about its central axis 2, through which the trees 1 to be treated through the space defined by the cylindrical inner jacket 4 are fed, whereby they are subjected to abrasion and impact. The drum 3 is supported in an inclined position 111914 4 so that its central axis 2 forms an acute angle a with respect to the horizontal. The angle α is between 2 and 12 °. A typical value is about 5 °.

In the example of the drawing, the drum 3 is supported externally on the wheels 12 and 5 is provided with means generally designated 13 for rotating the drum 3.

For the sake of clarity, a conveyor is omitted from the drawings, by means of which the trees 1 coming from the unloading end of the drum 3 are further transported to subsequent processing steps 10.

A plurality of blades 11 are provided on the surface of the cylindrical inner shell 4 of the drum 3 for treating the trees 1 fed through the drum 3. The blades 11 tear off the bark of the treated tree 1 or make transverse incisions at appropriate intervals in the bark, whereby during the pre-treatment in the drum 3 or later in the actual bark drum, the bark is more easily detached and of a suitable length.

4 on the surface of the drum 3. The inner shell is one or 20 arranged in the example of Figure 1, preferably more relative to the drum central axis of the helically rotatable ridge-like projections 8. The ridge-like projection 8 formed of Figure 1 • · * · * example in which the drum 3 is arranged to rotate in the direction of arrow B direction, * · · ·; ·; left hand thread. In this case, the rotational movement of the drum 3 exerts a force on the trees leaning against the projections 8 towards the discharge end of the drum 3, i.e.; / 25 in Figure 2 by arrow A directed force.

* · *

In principle, the tilt angle of the drum 3 to provide a sufficient trees, one forward movement direction of arrow A, if the inclination angle a is sufficiently large. Outdoor-_! However, the worms 8 enhance the propagation of the trees in the drum 3 and reduce the strain on the inner mantle 4 of the drum 30.

With the ridged protrusions 8, the blades 11 are arranged to protrude from the surface of the inner shell 4 of the drum 3 towards the central axis 2 of the drum 3 more than 5 111914 the ridged protrusions 8, whereby the drums 3 rotate break the bark.

The operation of the drum 3 may be based solely on the mutual movement of the trees 1 and the blades 11 caused by the rotation of the drum, whereby the trees 1 are incised by the blades 11. However, the efficiency of the device, in particular with respect to peeling off the bark, may be increased by rotating the drum 3 at such a rotation speed that, for each individual tree 1 of the set of wood 10 in the drum, the rotational movement of the drum 3 3 to the inner sheath 4 or to the part protruding therefrom. The rotation speed of the drum 3 is selected so that the centrifugal force exerted by the drum 3 on the tree 1 causes each tree 1 to alternately throw, causing the tree to fly over the other trees being processed and the collisional forces due to the collision resulting from this essentially free fall 3 will be further enhanced.

The shell separation unit 30 may be formed immediately by a roller formed behind and / or in front of the release unit. In some cases, the roller skate may be replaced by an opening (not shown) in the movement path of the trees 1, through which the shells are allowed to fall. However, the opening is dimensioned so that the trees 1 do not fall * · · 'through it. In the exemplary embodiment of Figure 2, the shell separator unit 30 is formed by a roller assembly 31 consisting of a plurality of rotatable rollers 31 arranged as an extension of the inner casing 4 of the release unit (drum) 3, the rollers of which are their axis of rotation is substantially parallel to the central axis 2 of the drum 3. Rolls 30 of roller set 30 on front of drum 3 • ·; in contrast, are arranged transversely to the central axis 2 of the drum 3.

30 ': In the example of Fig. 2, the trees fed to the drum 3 are provided with a rapid change of direction at the roller 30 »• *» »·, which further promotes the removal and fall of the bark.

6 111914 By arranging a plurality of studs formed one after the other from the release unit 3 and the separation unit 30, the casing removal and separation steps can be intensified to achieve the desired end result.

Figures 4 and 5 show an example of attachment of the blade 11 to the drum 3. An opening 20 is provided in the inner shell 4 of the drum 3 for the blade 11. A support plate 21 is welded around the aperture 20 on the outside of the drum 3, having an aperture of the same size as the aperture 20 and threaded holes 22 for fixing screws 23 of the blade 11. The blade 11 is welded to the protrusion 24, 10 which in turn is attached to the retaining plate 25. The retaining plate is fastened with screws 23 to the support plate 21. To obtain the desired protrusion from the surface of the inner sheath 4, the blade 11 is provided with a sufficient number of spacers 26. Thanks to the arrangement, the blade 1 can be easily replaced from the outside of the drum 3.

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Claims (4)

Apparatus for barking or pre-treatment before the actual barking of trees, in particular heavy barking trees (1), which has a detaching unit (3) of the bark for detaching the bark from the wood and a barking unit (30) for separating the released bark from the barked tree, which release unit (3) is formed by a rotatable drum around its center axis (2) through which the space (1) of the drum (1) to be treated is limited by the cylindrical inner sheath (4) to be measured. is subjected to relative movement of progressive shearing, cutting and punching by means of the inner sheath of the drum and from this innate protruding treatment means (11) to break and release the bark, which processing means consists of a plurality of knives (11) inserted. protruding from the surface bounded by the cylindrical inner sheath (4) of the drum (3), characterized in that the bark separating unit (30) is formed a is provided substantially as a continuation of the inner sheath (4) of the drum (3), consisting of a plurality of rotatable rollers (31) consisting of roller assemblies, the rollers of which are so arranged that their axis of rotation is substantially parallel to the center shaft (2) of the drum (3) . Device according to Claim 1, characterized in that the device therefor has a second separating unit (30) which is arranged in the forward direction (A) of the training (1) immediately before the release unit (3) of the bark. <I I * # Device according to Claim 1, characterized in that the device * 1 'comprises at least one of the at least release unit (3) and a separating, retaining unit (30) through which the trains (1) are arranged. to be brought. »