LV11291B

LV11291B - Debarking and chipping apparatus

Info

Publication number: LV11291B
Application number: LV940075A
Authority: LV
Inventors: Kauko Rautio
Original assignee: Kauko Rautio
Priority date: 1993-04-19
Filing date: 1994-04-18
Publication date: 1996-08-20
Also published as: SE511158C2; SE9401130D0; RU94013113A; EE03260B1; RU2131352C1; LV11291A; SE9401130L

Abstract

FIELD: wood-working industry. SUBSTANCE: device consists of barking unit stripping and cutting the bark into chips and chopping machine located behind barking unit and converting nucleus wood into chips for cellulose cooking. Device is designed for obtaining and using wood chips with bark and chips suitable for cooking cellulose out of small-sized trees having diameter 4-20 cm. EFFECT: enhanced efficiency.

Description

1 LV 11291

Debarking and chipping apparatus

The present invention relates to a debarking and chipping apparatus, mainīs for coniferous trees, which apparatus is intended for the production and recovery of bark chips and of chips for digestion from small trees having a diameter of approximately 4-20 cm.

In forest clearance, small trees are usually left to rot in the forest, since the use of small trees, for example industrially, is very cumbersome. The object of the invention is to provide an apparatus of a new type, by means of which small trees which have previously been left in the forests can be utilized industriāli· The debarking and chipping apparatus according to the invention is characterized in that the apparatus is made up of a debarking unit which debarks the tree and chips the bark, the debarking unit being followed by a chipper which turns the heartwood into chips for digestion. By means of the invention, small trees are thus utilized one hundred percent, since the bark chips are used for fuel and the digestible chips for the production of pulp. The debarking and chipping rāte of the debarking and chipping apparatus being, for example, 150 m/min, it can be calculated roughly that approximately 150 m3 of digestible chips and approximately 60 m3 of bark chips are ob-tained in one day. If the apparatus is in operation 24 hours a day, these figurēs can be multiplied by three. The rāte can, of course be considerably higher than that in the said example.

One embodiment of the invention is characterized in that the debarking unit is made up debarking cutters in connection with which there is a support blade which grinds the bark and at the same time leans against the tree surface, thus allowing the debarking cutters to cut the bark and a predetermined amount of the sapwood. Since chips for digestion may contain bark at maximum 1 %, the debarking cutters cut the tree surface to such 2 an extent that a clean heartwood bole is obtained for chips for digestion. The fuel value of the bark chips is better if it also contains sorae wood.

Another embodiment of the invention is characterized in that the debarking cutter is made up of two cutter blades mounted on one and the same arbor at a blunt angle, e.g. a= 135°, to each other, with a support blade between thera. When four evenly distributed debarking cutters are used, a debarked heartwood bole is obtained which has, for exainple, an octagonal cross sectional shape. Thus the quantity of digestible chips ending up in bark chips is not unnecessarily high. There may also be only two cutters, or more than two or four.

One embodiraent of the invention is further characterized in that the arbor of the debarking cutter is telescopic so that the debarking cutter can raove in the axial direction according to the shape of the tree. The debarking cutter will thus follow gently the shape of even a warped tree and will not leave bark on the surface.

One embodiment of the invention is characterized in that the debarking unit with its raotor is mounted on a pivot axle in such a manner that the entire debarking unit can move around this axle according to the shape of the tree. The debarking cutter will thus follow the shape of a warped tree in direc-tions transverse to the tree.

One embodiment of the invention is characterized in that the debarking unit with its motor is mounted to the apparatus frame by Iever transmission in such a manner that the debarking unit is able to move about the mounting axle and in the direction of the arbor of the debarking cutter. This is one embodiment which additionally allows movements of the debarking cutter in direc-tions transverse to the tree. 3 LV 11291

One embodiment of the invention is further characterized in that the pressing movements of the debarking cutters and the attenuations of the follow movements are produced by means of pressure cylinders known per se. Since the couplings and func-tions of the pressure cylinders constitute technology known per se, separate coupling diagrams are not presented for them.

One embodiment of the invention is characterized in that in connection with the debarking cutter there is a guide trough which guides the debarking cutter according to the shape of the tree. The guide trough drags along the tree surface and thus guides the movements of the debarking cutter in the direction of the arbor of the cutter, following the center line of the tree in accordance with the shape of the tree. The guide trough may be spring- or cylinder-loaded relative to the debarking cutter, in such a manner that it yields if there are branch stubs on the tree surface or νΛ>βη barks of different thick-nesses are worked on.

One embodiment of the invention is further characterized in that in connection with the chipper there is a dividing unit which separates the chips containing bark chips from pure di-gestible chips. Thus the bark chips for fuel can be immediately separated from the chips going to the pulp industry. The posi-tion of the pivoting flap can be regulated by the distance of the feed rolls from each other. For example, if the distance between the rolls is less than 40 mm, the flap will direct the chips into bark chips.

The invention is described below with the help of an example, with reference to the accompanying drawings, in which Figurē 1 depicts a side view of the debarking and chipping apparatus,

Figurē 2 depicts the apparatus as seen from the feed direction, Figurēs 3 and 4 depict a telescopic arbor of the debarking cutter, 4

Figurē 5 depicts an articulated mounting of the debarking cut-ter,

Figurē 6 depicts the guiding of a curved tree and the cutting by one cutter, and

Figurē 7 depicts debarked heartwood in cross section.

The debarking and chipping apparatus is made up of a debarking unit 1, which debarks and cuts the bark into bark chips. The debarking unit 1 is followed by a chipper 2, which producēs chips for digestion from the heartwood. To the frame 3 of the debarking and chipping apparatus there are attached feeder rolls 4, which feed a bole 5 between guide rolls 6 into the debarking unit 1. Between the debarking unit 1 and the chipper 2 there is another set of feeder rolls 7. In connection with the chipper 2 there is a dividing unit 9 operated by means of a pivoting flap 8, which separates chips containing bark chips from pure digestible chips in the manner indicated by arrows. The debarking unit 1 is made up of four debarking cutters 10, in connection with which there is a support blade 11, which grinds the bark and at the same time leans against the tree 5 surface and thus allows the debarking cutters to cut off the bark 12 and a predetermined amount of the tree surface 13. The debarking cutter 10 is made up of two cutter blades 15 which are mounted on the same arbor 14 at a blunt angle α = 135° to each other, there being a support blade 11 between them. The debarking cutters 10 are mounted so that the debarked heartwood 16 will be hexagonal in cross section, as shown in Figurē 7.

The debarking unit with its motor 17 is mounted on a pivot axle 18 in such a manner that an entire debarking unit la, lb, lc, ld can move around this axle according to the shape of the tree. In the embodiment according to Figurēs 3 and 4, the turn-ing arbor 19 of a debarking cutter is telescopic in such a manner that the debarking cutter can move in the direction of this arbor according to the shape of the tree. In the embodiment according to Figurēs 2 and 5 the debarking unit with its motor 17 is mounted to the apparatus frame 3 by Iever 5 LV 11291 transmission 20 so that the debarking unit can move around the mounting axle 18 in the direction of the arbor 21 of the debarking cutter. In connection with the debarking cutter 10 there is a guide trough 22, which guides the debarking cutter 10 according to the shape of the tree.

It is clear for an expert in the art that the invention is not limited to the example presented above; it may vary within the scope of the accompanying claims. The pressure cylinders be-longing to the apparatus and the functions of the cylinders have thus not been described in greater detail, since their couplings and functions constitute state-of-the-art technology. The working speed may vary. The number of cutters may be greater or smaller than four. The movements of the cutter may also be on other arms, in which case they will be somewhat different from those in the examples described above, but for working, there are actually needed only a movement parallel to the cutter radius, this movement being directed by the support blade/spring force, and a movement in the direction of the cutter arbor, this movement being directed by a spring-loaded guide trough, which is fixed in the direction of the cutter arbor and movable in the transverse direction. The flap guiding the chips may also be controlled automatically to pivot according to the thickness of the tree being worked on and/or, for example, by camera monitoring. The cutter blade angle may vary. The cutter blades may also be curved. 6 LV 11291

Claims 1. A debarking and chipping apparatus mainly for coniferous trees, intended for the production and recovery of bark chips and digestible chips from small trees (5) having a diaraeter of 4 - 20 cm, characterized in that the apparatus is made up of a debarking unit (1), which debarks and cuts the bark into bark chips, and that the debarking unit is followed by a chipper (2) which turns the heartwood (16) into chips for digestion. 2. A debarking and chipping apparatus according to Claira 1, characterized in that the debarking unit (la, lb, lc, ld) is made up of a debarking cutter (10), in connection with which there is a support blade (11), which grinds the bark (12) and at the same time leans against the tree surface and thus allows the debarking cutter (10) to cut off the bark (12) and a prede-termined amount of the tree surface (13). 3. A debarking and chipping apparatus according to Claim 1 or 2, characterized in that a debarking cutter (10) is made up of two cutter blades (15) mounted on the same arbor (14) at a blunt angle, e.g. α = 135°, to each other, there being a support blade (11) between them. 4. A debarking and chipping apparatus according to Claim 3, characterized in that the debarking cutters (la, lb, lc, ld) are four in number, and they are mounted so that the debarked heartwood (16) will be substantially octagonal in its cross section. 5. A debarking and chipping apparatus according to any of the above claims, characterized in that the arbor (19) of a debarking cutter (10) is telescopic so that the debarking cutter (10) can move in the direction of the arbor according to the shape of the tree. 6. A debarking and chipping apparatus according to any of 7 the above claims, characterized in that the debarking unit (la, lb, lc, ld) with its motor (17) is mounted on a pivot axle (18) so that the entire debarking unit can move about this axle according to the shape of the tree. 7. A debarking and chipping apparatus according to any of the above claims, characterized in that the debarking unit (la, lb, lc, ld) with its motor (17) is mounted to the apparatus frame (3) by Iever transmission (20) so that the debarking unit can move around the mounting axle (18) and in the direction of the turning arbor (21) of the debarking cutter (10). 8. A debarking and chipping apparatus according to any of the above claims, characterized in that the pressing movements of the debarking cutters (10) and the attenuations of their follow movements are effected by means of pressure cylinders (23) known per se. 9. A debarking and chipping apparatus according to any of the above claims, characterized in that in connection with the debarking cutter (10) there is a guide trough (22) which guides the debarking cutter according to the shape of the tree. 10. A debarking and chipping apparatus according to any of the above claims, characterized in that in connection with the chipping apparatus (2) there is a dividing unit (9) operating by means of a pivoting flap (8), the unit separating the chips containing bark chips from pure digestible chips. LV 11291 8

Abstract A debarking and chipping apparatus mainly for coniferous trees, intended for the production and recovery of bark chips and chips for digestion frora small trees (5) having a diameter of 4-20 cm. The apparatus is made up of a debarking unit (1), which debarks and cuts the bark into bark chips, and the debarking unit is followed by a chipper (2) which turns the heartwood (16) into chips for digestion.

Figurē 1

Claims

EN 11291 DESCRIPTION OF THE INVENTION 1. A peeling and chipping plant, mainly for coniferous trees, intended for the production and utilization of small trees (5) with a diameter of 4 to 20 cm bark chips and tough shavings, characterized in that the apparatus consists of a peeling unit (1) which peel and peel the bark, and the peeling knife followed by a chopper (2), which converts the nuclear wood (16) into cooking biscuits.

2. A peeling and chipping machine according to claim 1, characterized in that the peeling unit (1a, 1b, lc, ld) consists of a peeling groove (10) connected to a support pile (11) which grinds the peel (12) and simultaneously resting on a wooden surface and thus allowing the peeling cut (10) to remove the bark (12) and a predetermined portion of the wooden surface (13).

3. A peeling and chipping machine according to claim 1 or 2, characterized in that the peeling groove (10) consists of two cutting edges (15) mounted on a wide shaft (14) at a wide angle, t. i., α = 135 ^, one to the other, with a support (11) between them.

4. A peeling and chipping machine according to claim 3, characterized in that it has four peeling grooves and is designed so that the cross-section of the peeled nuclear wood (16) is substantially octagonal.

A peeling and chipping machine according to any one of the preceding claims, characterized in that the peeling (10) shaft (19) is telescopic, allowing the peeling cutter (10) to move in the direction of the shaft in accordance with the wood contour.

A peeling and chipping machine according to any one of the preceding claims, characterized by it. that the peeling unit (la, lb, lc, ld) and its motor are mounted on the pivot so that the peeling assembly can move around this axis in accordance with the tree contour.

7. A peeling and chipping machine according to any one of the preceding claims, characterized in that the peeling unit (la, lb, lc, ld) and its motor (17) are fixed to the frame (3) of the machine by a lever transmission (20) such that the peeling unit can move around the mounting axis (18) and the peeler (10) in the direction of rotation of the shaft (21). - 2 -

8. A peeling and chipping machine according to any one of the preceding claims, characterized in that the compression movement of the peeling groove (10) and the subsequent movement thereof are controlled by generally known pressure cylinders (23).

A peeling and chipping machine according to any one of the preceding claims, characterized in that the peeling cutter (10) is associated with a guide groove (22) which guides the peeling groove according to the contours of the wood.

10. A peeling and chipping device according to any one of the preceding claims, characterized in that the splitting unit (9) connected to the chopper (2), which is operated by swivel latches (8), separates the bark chips from the clean chips.