FI112183B - Device for barking or pretreatment for barking of trees - Google Patents

Description

1112183

Apparatus for stripping or pre-treatment of trees for stripping

The invention relates to a device for peeling or pre-treating trees, in particular hard-to-peel trees, comprising a drum rotatable about its central axis, the wood being fed through the space limited by the cylindrical inner shell of the drum, subjected to rubbing and punching; an internal element (5) formed which divides the space bounded by the cylindrical inner shell of the drum into the actual treatment space 10 and the outside thereof, wherein the trees fed through the drum are arranged to pass through the drum through said treatment space.

It is important for the quality of the cellulose to keep the bark of the chipped trees 15 to a minimum. Bark removal, from the surface of the trees, usually occurs in the bark drum, where the mutual movement and rubbing of the trees cause the bark to come off. The loose finely crushed shell falls mainly through the drum shell openings: to the shell conveyor underneath the drum.

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For some types of wood, the bark comes off as long strips or large sheets, whereby the loose bark tends to come out of the bark drum discharge end with the trees. Many hardwoods such as eucalyptus, such as acacia, hickory and birch, are such troublesome peels. On the other hand, it may also be a problem that the bark is very tightly closed, whereby the peeling of wood in a conventional bark drum is slow. Another problem with some wood species is that they - especially small trees - easily break in the bark drum.

The object of the invention is to provide a device with a rotating drum; The wood to be treated can be subjected to various treatments for stripping bark. · Sex, which can also be used to treat trees that are easy to break and difficult to peel. In particular, it is an object of the invention to separate the bark as efficiently and as early as possible from the 2 112183 trees into their own separate space, whereby such already detached bark does not adversely affect the operation of the device.

This object is solved in accordance with the invention and the device 5 according to the invention is characterized in that a slot is provided between the inner element and the inner drum sheath for removing the shells from the treated child to a space on the opposite side of the inner element.

Preferably, the drum-limiting treatments of the inner member have elongated cross-sections.

In a preferred embodiment of the invention, a plurality of blades are arranged to protrude from the surface of the cylindrical inner shell of the drum for treating trees fed through the drum, the blades being arranged to incise or tear the surface of the treated wood under the action of the drum. The peel is then severed and peeled off during said or subsequent actual peeling treatment in suitable sized pieces.

Preferred further developments of the invention are set forth in the dependent claims.

The invention will now be further described with reference to the accompanying drawings, in which: 25. The figure shows a perspective view of the device according to the invention.

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

Figure 3 shows a section along line III-III in Figure 2.

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

3, 112183

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

A device for peeling or pre-treating trees, particularly difficult to peel, is shown schematically in perspective view in Figure 1. The device is illustrated at the discharge end. In Figure 2, the device is shown in a side view, with the feeding direction of the trees indicated by an arrow A. Figure 3 further shows a section along line III-III in Figure 2.

The apparatus includes 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 shell 4 are fed, whereby they are subjected to abrasion and shocks to handle the shell. The drum 3 is supported in an inclined position such that its central axis 2 forms an acute angle α with respect to the horizontal. The angle α is between 15 ° 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 provided with means generally designated 13 for rotating the drum 3.

, ;; · · 20 :. For the sake of clarity, both the conveyor for feeding the trees 1 to the drum 3 and the conveyor for conveying the trees from the discharge end of the drum 3 to the following processing steps are omitted from the drawings.

Inside the drum 3 is formed a fixed or adjustable internal element 5. The element 5 is arranged to extend into the desired • · ': *' area of the drum 3, i.e. the whole length of the drum or only part of its length, and I * *: arranged to divide the space delimited by the cylindrical inner sheath 4 of the drum 3 into a reserve * blue processing space 6 and a space 7 outside thereof. : joke through the above 6 processing. Thus, the treatment 6 is formed by an open channel at the ends of the drum 3, the inner shell surface of which is formed by a continuous wall 17 formed by an inner element 5 adjusted to a desired position and a rotatable inner shell 4 portion of the drum 3.

The relative movement between the trees 1 and the inner jacket 4 of the drum 3 can be changed by changing the position of the inner member 5.

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 trees 1 or make transverse incisions 10 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.

As best shown in Figures 1 and 3, the inner member 5 is rotatable relative to the central axis 2 of the rum-15. The inner element 5 may also be mounted rotatably with respect to the drum. For rotation, the inner element 5 is supported at both ends by means of suitable beams 14 and support bearings 16 into the frame structures of the device. As best shown in Figure 3, the inner member 5 is locked to form its actual operating position. 20 countries to their basic position by means of a power member 15. One end of the force member 15, which may be formed, for example, by a tension spring, is fixed to the fixed frame body 14 and the other end to the inner element 5.

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In one embodiment, the inner member 5 is arranged to rotate away from its 25 operating or basic positions when the inner member 5 is subjected to a force exceeding a predetermined force, and respectively to return to its basic position.

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': * To its position when said force exceeding a predetermined force ceases to act. Such a force may occur if the direction of the arrow B in the direction of rotation <* of the rib of the drum 3 inside the casing 4 and between the inner element 5 into the gap 9 can wedge · * 30 Lautumat bark or wood, wherein the damage caused by the drum 3 and the inner element 5 sudden seizing of the valve can be reduced or they can be completely avoided.

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4 on the surface of the drum 3. The inner shell is one configured example of Figure 1, or preferably more relative to the drum central axis of the helically rotatable ridge-like projections 8. The ridge-like projection 8 is the example of Figure 1, with the drum 3 is arranged to rotate in the direction of arrow B suunnas-5 SA, a right-handed helix. In this case, the rotation of the drum 3 causes the projecting atoms 8 against the trees that rely on one of the drum 3 towards the discharge end directed force in a direction of arrow A in Figure 2 the direction of gravity.

In principle, the tilt angle of the drum 3 to provide a sufficient trees ete 1-10 nemisliikkeen direction of arrow A, if the inclination angle a is sufficiently large.

However, the protrusions 8 enhance the propagation of the trees in the drum 3 and reduce the strain on the inner sheath 4 of the drum 3.

When using the ridged protrusions 8, the blades 11 are arranged to protrude 15 from the surface of the inner shell 4 of the drum 3 towards the central axis 2 of the drum 3 more than the ridged protrusions 8, whereby the drums 3 rotate and the trees 1 rest on the ridged protrusions 8. tear the 1 surface of the trees and thus break the bark.

• I ·. · * 20 generated inner element 5 of the wall 17 is formed at the lower end kiilamaisek-. Si spout 18 so that the drum 3 rotary motion to force the timber 1 to 'the direction of arrow I in Figure 3 C, the direction of movement of the inner element 5 of the wall 17 and the drum I "' 3 inside the casing 4 controller. Between said wedge-shaped nose 18 of the inner element 5 and the inner drum sheath 4 of the inner member 5, a slot 9 is provided for removing the shells from the treatment space 6 to a space 7 on the opposite side of the wall 17 of the inner member 5. on the way, allowing the shells to pass through the gap 9 per space: 7 is facilitated.

• ·:.: I 30 A shell space 10 is arranged in space 7, from which the shells are arranged to be removed: ...: by means of devices not provided by machine. Alternatively, the shells are arranged to leave said space 10 by the rotational movement of the drum 3 and by the inclination of the drum 3 acting therewith and / or by the helical protrusion 8 provided on the inner surface 4 of the drum 3.

In principle, the drum 3 to the example of Figure 3 rotate in the direction of arrow B in the opposite direction with respect to 5, wherein the tree takes place in one movement direction of arrow C to the direction of the opposite direction. The exit of the shell can then not take place through the slot 9, but only at both ends of the drum 3, preferably at the discharge end, and / or with the shell openings (not shown) in the housing.

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Figures 4 and 5 show an example of attachment of blade 11 to drum 3.

An opening 20 is formed in the inner jacket 4 of the drum 3 for the blade 11. A support plate 21 is welded around the opening 20 on the outside of the drum 3, having an opening of the same size as the opening 20 and threaded holes 22 22 for the screws 23 for the blade 11. The blade 11 is welded to the protrusion piece 24, which in turn is attached to the retaining plate 25. The retaining plate is secured 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 26. Thanks to the arrangement, the rails i '20 can be easily replaced from outside the drum 3.

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Claims (9)

7 112183 Apparatus for peeling or pre-treating trees (1), in particular hard-to-peel trees, comprising a drum (3) rotating about its central axis (2), the trees being processed through a space defined by a cylindrical inner jacket (4) ), being subjected to abrasion and impact to treat the shell, an inner element (5) is formed inside the drum (3), which element is arranged to divide the space defined by the cylindrical inner shell (4) into the actual processing space (6) outside the space (7), wherein the trees (1) which are fed through the drum (3) are arranged to pass through the drum (3) via said treatment spout (6), characterized in that the inner element (5) and the inner shell (4) of the drum (3) a slot (9) is provided for removing the shells from the treatment space (6) to the t-15 (7) on the opposite side of the inner element (5). Apparatus according to claim 1, characterized in that said space (7) is provided with a shell space (10) from which the shells are arranged to exit: the rotational movement of the drum (3) and the drum (3) acting therewith; or by the helical projection (8) provided on the inner surface (4) of the drum (3). Device according to Claim 1, characterized in that said space (7) is provided with a shell space (10) from which the shells are arranged to be mechanically removed. I · * Device according to claim 1, characterized in that the inner element • ·; (5) The treatment space (6) delimited by the drum (3) has a conical length 1 · '·; · *. Li i 30 Apparatus according to claim 1, characterized in that a plurality of blades (11) are projected on the surface of the cylindrical inner shell (4) of the drum (3) for treating wood (1) fed through the drum (3), which blades 112183 (11) or tearing the surface of the trees under treatment (1) due to the mutual movement of the drum (3) and the trees (1). Device according to Claim 1, characterized in that the inclination angle (α) of the central axis (2) of the drum (3) with respect to the horizontal is between 2 and 12 °. Device according to Claim 1, characterized in that the inner element (5) is rotatable with respect to the central axis (2) of the drum (3). Device according to Claim 5, characterized in that the inner element (5) has a certain base position, from which it is arranged to rotate when a force exceeding a predetermined force is applied to the inner element (5) and return to its basic position when said force exceeding a predetermined force is applied. the power ceases to be effective. 15 Apparatus according to claim 1, characterized in that one or more protrusions (8) helical to the central axis (2) of the drum are provided on the surface of the inner shell (4) of the drum (3). * '% »*» * · * · I I I • · • ·> · 112183