FI59212C - ANORDNING FOER TRAEDAVBARKNING - Google Patents

Description

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Patent · och reglsterstyrelaen 'Arnokin utiafd och utUkrHtM puwtc * r »d 31.03.81 (32) (33) (31) P> nrf *« r etuoik ·· * —B ^ lrd prioriut 2¾.07.72 USA (US) 27 ^ 190 (71) (72) Aux P. Schnyder, lU6 Cherry Lane, Teaneck, New Jersey 07666, USA (71 *) Berggren Oy Ab (5it)

The invention relates to a wood peel device comprising a colony with its body parts for receiving and continuously peeling logs, the device having at least one rotating part for lifting the logs in the colony by rotation, the device having a deflector member supported independently of the rotating parts to deflect the logs passing along the perimeter of the colony as the rotating parts of the colony rotate.

In known devices, the removal of the bark is carried out either by friction, by tilting or twisting the wood, or by mechanical friction or hydraulic action. The device often and on a large scale used for such debarking is a debarking drum, which usually contains one or more large rotating drum parts and removes the shell in the usual way by friction, mainly due to the rotation of the logs as they pass through the drum. As a result of this somewhat violent and indiscriminate rotation that takes place inside such a conventional drum, the ends of the logs flatten when the logs are separated from the drum. Shredding during the peeling operation of a conventional device causes a 2-3% loss on wood fibers and has a detrimental effect on paper quality if sand or dirt-containing ingredients are present in the peeling drum, as such ingredients mix with the shredded ends and then pass through the lignin removal and papermaking stages.

It is also known to use a tunnel shell device comprising a keyhole-shaped tunnel structure adapted to co-operate with a rotating spiral cage to move a stack of generally parallel logs in the transverse direction and up one side of the tunnel so that the logs rotate and slide over each other to remove the shell. The tunnel is generally cylindrical in shape, and the cage includes a plurality of angularly spaced pushers that generally extend longitudinally of the tunnel. The pushers are rigidly attached to a set of rings that support the cage structure so that it can be rotated by those who use it. Some of these rings can be made to form part of the circumference of the tunnel, while adjacent parts in the axial direction of the inner circumference of the tunnel are formed of solid concrete structures. At the bottom of the cylindrical part of the tunnel there is a lattice grid which allows the shell detached from the supports to pass out of the tunnel through it.

The power of such a tunnel load device is limited by its rotational speed with respect to the necessary support structure and the working mechanism, e.g. a helical cage placed on the pin supports. For this reason, in high-capacity plants, a lot of tunnel shell equipment is needed for the continuous production of peeled logs.

The rotational speeds of current tunnel shell equipment vary between about 5-7.5 rpm in a drum with a diameter of 3.66 meters. At such rotational speeds, the logs usually come close to the top of the peeler and fall down like an avalanche, leading to increased shedding with associated fiber losses. At speeds above 7.5 rpm, the logs tend to rotate the circumference of such a peeling device, thus preventing peeling from occurring.

3,59212

The features of the invention appear from the following claims. A particular object of the invention is to provide a peeling device in which the arrangement of the deflection member and the peeling member prevents the ends of the logs from sagging.

It is also an object of the invention to provide a peeling device which does not contain any other disadvantages. In addition, the peeling device according to the invention requires little maintenance and repair, and the device can handle logs of different thicknesses and lengths.

Other advantages of the invention will become apparent from the following, with reference to the accompanying drawings, in which the same reference numerals denote the same parts throughout the figures, of which Figure 1 shows a partial cross-sectional top view of an embodiment of a peeling device according to the invention; Figure 2 is an enlarged side cross-sectional view of the peeling device of Figure 1 taken along line 2-2 of Figure 1; Figure 3 is an enlarged side cross-sectional view of such a crimping device taken along line 3-3 of Figure 1; Figure 4 is a partial cross-sectional view of the grate of such a peeling device taken along line 4-4 of Figure 2; Figure 5 is a slightly enlarged partial cross-sectional view taken along line 5-5 of Figure 1; Figure 6 is a simplified end view of the mouth of such a peeler; Figure 7 is a simplified end view of the discharge end of such a peeler; Fig. 8 is an enlarged view of a roller assembly with a pin support for a drive ring of such a peeling device, taken along line 8-8 of Fig. 3; Fig. 9 is an enlarged view of a traction sheave assembly for a ring of such a peeling device, taken along line 9-9 of Fig. 3; Figure 10 is a partial plan view of a normal peel drum modified for use with the present invention; Figure 11 is a cross-sectional view of the embodiment of Figure 10 taken along line 11-11; and Figure 12 is a cross-sectional view of the embodiment of Figure 10 taken along line 12-12 thereof.

4,59212

Figures 1-9 show a peeling device, generally designated 10, specifically for removing peel from paper logs, including a plurality of solid concrete body portions 12 and 14 suitably disposed on a substrate 16. Slots 18 and 20, respectively, are formed in the body portions 12 and 14. on the same line in which the slots are fitted with support rollers, generally indicated at 22 and supporting corresponding drive rings, generally indicated at 24. The fixed body parts 12, 14 and the drive rings 24, together with the upper wall 30 to be described hereinafter, form a colony into which the logs to be peeled by the peeling device 10 are introduced. The body portion 12 extends upwardly to the center of the peeling device 10 and includes slanted reinforcing bars 26 at an angle of about 10 ° in the feed direction that promote unobstructed forward bundle access from the mouth to the outlet, as will be explained later. The body portion 14 extends upwardly above the center, including an inwardly extending side wall 28 (between adjacent slits) which forms an impact wall, i.e. a peeling member, which peels the logs as they are ejected against this impact wall 28. The peeling device is closed by an inverted J-shaped top wall, generally indicated at 30, including a curved crotch portion 32 and a horizontal crotch portion 36 positioned at the end 34 of the body portion 12 and supported at the end 38 of the body portion 14 by the body portion 14 forming an impact to the side, preventing the logs in the colony from moving circumferentially around the colony due to the rotational movement of the drive rings 24.

Each drive ring 24 is assembled from a cylindrical tie portion 40 in which a pair of outwardly projecting portions 42 are placed, to which in turn are attached a plurality of rods 44 forming a rack assembly, as shown in particular in Figures 8 and 9. As shown in Figure 8, the support roller 22 includes a guide roller 46 disposed in support portions 51 in the slots of the body portions 12 and 14, positioned on a shaft 48 rotatably mounted in suitable support portions 50. The drive rings 24 are provided with a plurality of triangular pushers 52, suitably attached by welding to the inner surface of the binding member 40.

5,59212

In particular, Figures 1 and 2 show a drive, generally designated 54, comprising a central electric motor 56 disposed on a body 14 and a shaft 58 provided with a gear 60. An endless belt or chain 62 is arranged to rotate about gears 60 and 64, the latter is mounted on a horizontal drive shaft 66 mounted on a plurality of longitudinally aligned bearings 68. A plurality of bevel gears 70 are mounted on the shaft 66 at a distance from each other in a manner corresponding to the position of each drive ring 24. The wheels 70 have outwardly projecting teeth 72 overlapping the rods 44 of the drive ring 24, thus forming a gear transmission which rotates the drive rings 24 in the peeling direction.

It can be seen from Figures 5 and 6 that the feed end of the peeling device 10 is provided with an end wall 74 with an opening 76 in the upper right quarter (as seen from the inside of the peeling device 10). The high speed roller assembly 78 is arranged to feed the logs longitudinally to the peeling device 10 at a high feed speed to continuously maintain a parallel log assembly or bundle. Figure 7 shows somewhat schematically the discharge end of a peeling device 10 which is substantially open and provided with high power roller assemblies 80 and 81 for rapidly removing peeled logs from the peeling head.

Figure 4 shows a grate structure, i.e. a lattice grid, generally indicated by the number 90, placed in the lower part of the peeling device 10 and containing curved rods 92 which generally follow the cylindrical shape of the circular part of the body parts 12 and 14. The intermediate parts of the bars 92 can be fixedly fixed to each other by means of reinforcing pipe parts 94 or the like located longitudinally between the adjacent drive rings 24 of the peeling device 10 running next to the bars 92 and / or being attached thereto, e.g. by welding. The lattice grate 90 extends substantially the entire length of the peeling device 10 (excluding the slits 18 and 20). The movement of the logs along the surface of the grate 90 is effected by means of pushing members 52 in the drive rings 24. A conveyor device (not shown) known per se is arranged to remove the shell detached from the supports from the peeling device.

5921 2

Figures 10-12, in which the same numbers denote the same parts, show another embodiment of the invention, in which the known drum peeling device currently in use has been converted into a high-speed and high-efficiency peeling device. The shell mill 110 is formed by a plurality of fixed, substantially inverted J-shaped portions 114 interposed between adjacent drum portions, generally designated 113, suitably disposed on a base 116 at the ends of the shell mill 110. The drum portions 113 form a colony as described below. logs to be peeled by the peeling device 110. The space for the parts 114 is obtained by moving the respective drum parts 113 longitudinally relative to the drum peeler.

Each drum portion 113 includes a drum 115 mounted on drive rings 124 supported on rollers 122. A drive, generally designated 154, includes a motor 156 suitably mounted on a base 116. The drive includes a horizontal shaft 166 mounted on rotary support assemblies (not shown). A plurality of drive wheels 117 are mounted on the shaft 166 at a distance from each other. As shown in Fig. 10, a plurality of such drive gears 117 are in transmission with drum gears, while one of them is in gear with a drive shaft assembly generally designated 119 which includes a gear 121 mounted on the shaft 123 having support rollers 125 mounted on the shaft 123 connecting the drum portion. 113 rings 124 with each other.

A plurality of longitudinally extending I-beam portions 127 are disposed in the peeling device 110, which abuts the lower inwardly directed portion 129 of the body portion 114. The fixed plate portion 131 is disposed in the peeling device 110 and secured, e.g. Triangular deflector members 133 and 135 are formed in the upper portion of the body portion 114. The member 133 generally extends through the first portion 113 of the peeler 110, with the smaller member 135 passing through the remainder of the peeler assembly 110. A plurality of I-beam portions 137 and plate portions 139 suitably attached to each other, e.g., by welding, form deflector members 133 and r.

7 59212 and 135. These members 133, 135 deflect the logs during rotation of the drum portions 133 so as not to circumferentially pass around the drum portions 113, and guide such guided logs toward the peel member 131. The peelable logs are guided to the peeler 110 above the deflector member 133. that they become parallel inside the peeler before joining the log bundle.

An existing shell collector (not shown) is used to assemble and remove the shell from the shell device, as will be appreciated by those skilled in the art.

In connection with the operation of the embodiment shown in Figures 1-9, the paper logs are continuously fed to the peeling device 10 by means of high speed rollers 78 which cause the logs to travel along a ballistic flight path. The logs are forced axially by the pusher members 52 of the drive rings 24 of the peeler 10 extending the full length of the peeler 10, together with the effect of the logs striking the shell member 28. The pushers 52 cause the logs to rotate upward the deflector member 36 prevents the logs from moving in the circumferential direction of the colony around it, the logs striking the shell member 28 via the deflector member 36. The rotational speed of the drive rings 24 is such that it rotates the logs in the peeler, but no exception in the case of the peeler and peeler. Peeling is performed by frictional forces caused by the rotational movement of the logs in the log bundle as the shell effectively detaches as the logs strike the peel member 28. Since peeling is performed primarily by rotating logs in the parallel log bundle, logging can be substantially eliminated.

A grate assembly 90 mounted at the bottom of the tunnel allows detached shells to fall through a shell transport device (not shown) located below the grate assembly. The movement of the logs through the peeling device 10 is performed semi-hydraulically, i.e. after the initial filling, corresponding to each log fed to the peeling device, one 8 59212 log is removed simultaneously. The speed at which the logs are fed to the debarking device 10 depends on the type of wood fed to the debarking device. The discharge end of the peeler is substantially open, allowing the removal of peeled paper logs by a high speed roller assembly, which are then treated in an invisible manner to remove lignin for storage feed.

In general, the distance between the slots 18 and 20 of the body parts 12 and 14, respectively, is such that they form a complete unit, while half of the unit is used at the ends of the device. The complete unit, i.e. the distance between the drive rings, is determined by the length of the logs to be treated, so that each log must be transported by at least two drive rings. Thus, the distance between the drive rings is preferably half the length of the logs. As a result, when handling 3.7 m long logs, the drive rings must be placed at a distance of 1.83 m from each other, giving a full width of 1.63 m between the parts in the middle of the frame when using 20 cm gaps.

The drive rings 24 operate at a rotational speed large enough that the logs, in the absence of the deflector member 36 and the shell member 28, rotate the colony at approximately 7.5 rpm in a 3.7 m diameter tunnel shell device. It will be appreciated that such a speed depends above all on the diameter of the drive rings 24 and the length of the logs to be treated. Thus, the 3.7 m diameter barking device according to the invention is used at a rotation speed of 3 to 25 rpm to peel 900 m of southern pine wood per hour, which can be compared to the result of 180 m per hour obtained with a normal three-part 3.7 m diameter drum barking device of the same length. through.

It is clear that the shell edge, i.e. the collision wall, protects the drive rings (and in particular the rollers 22 in the body part 14) from the impact of the logs, thus reducing the maintenance requirements. In addition, the drive combination guarantees the correct axial position of the tire pushers. The grate combination allows continuous removal, limiting the shell pieces to the through size and cutting the fiber strands to a suitable length. When the belts of the logs are prevented from rolling out like tunnel shell devices, the propulsion requirements are equalized. The logs remain detached in a parallel position, as mentioned above, thanks to a shell member, i.e. a collision wall, which forces the falling logs again parallel to the bundles, while the working members lift the logs by gripping them from below.

Although only two embodiments of the present invention have been described above, it will be apparent that the embodiments may be modified within the scope of the following claim.