JP4018805B2 - Veneer veneer dehydrator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dewatering device for a veneer veneer before drying (hereinafter referred to as a veneer) obtained by cutting raw wood.
[0002]
[Prior art]
As an apparatus for removing moisture contained by compressing and deforming a veneer, there is an apparatus as described in Japanese Patent Publication No. 52-9721. That is, in order to remove the contained moisture by compressing and deforming the single plate to a thickness of 30% to 60% of the single plate thickness, the interval t between a pair of rotating rolls whose rotation axes are parallel is set to the thickness of the single plate. It is set to be 30% to 60%.
[0003]
[Problems to be solved by the invention]
Such conventional techniques have the following problems. In order to compressively deform the single plate to a thickness of 30% to 60% of the single plate thickness, the interval t between the pair of rolls is 30% to 60% of the single plate thickness, It must be composed of a steel body that hardly deforms. When a single plate is carried in between the pair of rolls having the above-described configuration, all of the normal portion in which the fiber direction is the carry-in direction in the single plate and the portion of the node where the fiber stands in the thickness direction of the single plate are all It is forcibly deformed from 30% to 60% of the thickness of the single plate. As a result, an unnecessarily large force is concentrated on the node, and the node is often destroyed. Further, in order to increase the removal of moisture, if the interval is further reduced, more nodes are destroyed.
[0004]
[Means for Solving the Problems]
In the present invention, in order to solve the above-mentioned problem, the distance between the peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven to rotate is equivalent to 50% or less of the thickness of a single plate to be loaded. One roll is provided with a lattice-like piercing body whose height in the radial direction of the roll from the peripheral surface is equal to or less than the interval on the peripheral surface, and the other roll is A single plate characterized in that the central portion is made of steel, and a synthetic rubber having a rubber hardness of 94 degrees or more is covered with a thickness of 10 times or more the value obtained by subtracting the interval from the thickness of the single plate. A dehydration apparatus is provided. Moreover, the lattice-like pitch of the piercing body may be provided with a wider pitch with respect to the fiber direction of the single plate to be loaded than a pitch with respect to the fiber orthogonal direction. The piercing body may be a quadrangular pyramid piercing body having two sides substantially parallel to the rotation direction of the roll. Further, the piercing body may be a piercing body having a substantially regular quadrangular pyramid that is substantially parallel to the rotation direction of the roll. The tip angle of the piercing body may be 90 degrees or more.
[0005]
When a veneer is carried between the rolls, most of the normal portion of the veneer where the fiber direction other than the node is the carry-in direction is compressed and deformed with synthetic rubber, and the fibers stand in the thickness direction of the veneer. Most parts of the knots are compressed and deformed by the synthetic rubber and pass between the rolls. Therefore, an unnecessarily large force is not applied to the node, so that the node is rarely broken, and moisture is removed from a normal portion of the veneer. Further, since the piercing bodies are provided in a lattice shape, the veneer can be stably conveyed.
[0006]
【Example】
Embodiments of the present invention will be specifically described below with reference to FIGS. 1 to 7, for example, when the thickness of a single plate is 4 mm.
[0007]
As shown in FIG. 1, P is a single plate to carry in. 1 is a steel roll which is one of the rolls. The steel roll 1 is composed of a shaft 3, a piercing tube material 5 and a bending cradle 19 which will be described later. The shaft 3 has a key groove (not shown) having the same width as the key groove 2B of the tube material 2 shown in FIG. Then, an electric motor (not shown) is connected, and is further rotatably attached to a machine base (not shown).
[0008]
The piercing tube material 5 has a substantially regular quadrangular pyramid piercing body 6 shown in FIG. 4A, which is an enlarged view of the portion A in FIG. 1, on the circumferential surface of the cylindrical tube material 2 shown in FIG. Is provided with a pitch of 6 millimeters, a pitch of 3 millimeters in the direction perpendicular to the rotation, and two sides of the substantially regular pyramid in parallel with the rotational direction. Further, when the piercing body 6 is viewed from the E direction, as shown in FIG. 4B, it is a triangular shape having a tip angle of 100 degrees formed by both oblique sides, and the height is 0.7 millimeters from the peripheral surface. Further, when the piercing body 6 is viewed from the F direction, as shown in FIG. 4C, it is a triangular shape having a tip angle of 100 degrees formed by both oblique sides, and the height is 0.7 millimeters from the peripheral surface.
[0009]
The cylindrical material 2 shown in FIG. 2 is made of stainless steel SUS420J2, and a central portion is provided with a through hole 2A and a key groove 2B that engage with the shaft 3, and the vicinity of the through hole 2A is recessed from the end surface of the cylindrical material 2. It is out. As shown in FIG. 1, a plurality of piercing tube members 5 are fixed to the shaft 3 with a key (not shown) with a gap S therebetween.
[0010]
1 is a rubber roll which is the other roll, and the steel roll 1 and the rotation axis are parallel. The rubber roll 13 is composed of a shaft 15, a rubber-equipped tubular material 17, and a bending cradle 19 described later. The shaft 15 has a key groove (not shown) having the same width as a key groove 16 </ b> B of a tubular material 16 shown in FIG. Applied to the machine base (not shown). In the cylindrical member 17 with rubber, the peripheral surface of the cylindrical cylindrical member 16 shown in FIG. 3 is covered with urethane rubber 16C having a rubber hardness of 98 degrees, which is a synthetic rubber, with a thickness of 45 millimeters.
[0011]
3 is made of stainless steel SUS420J2. A through hole 16A and a key groove 16B that engage with the shaft 15 are formed at the center, and the vicinity of the through hole 16A is more indented from the end face of the tubular material 16. It is out. Further, the length of the rubber-equipped tubular member 17 in the rotation orthogonal direction is the same as the length of the piercing tube member 5 in the rotation orthogonal direction. As shown in FIG. 1, a plurality of cylindrical members 17 with rubber are fixed to the shaft 15 with a key (not shown) with a gap S therebetween.
[0012]
A spur gear (not shown) is attached to the shaft 3 shown in FIG. 1, and a spur gear (not shown) is also attached to the shaft 15 to mesh with the spur gear.
[0013]
In the gap S between the rubber cylinders 17 and 17 shown in FIG. 1, as shown in FIG. 5, which is a partial cross-sectional view passing through the axis of the shaft 3 to the axis of the shaft 15, the bending cradle 19 has a bearing. The shaft 15 is rotatably supported via 19A. The flexure base 19 is attached to a machine base (not shown). Further, in the gap S between the piercing tube members 5 and 5, the upside down is similarly performed, but similarly, the bending receiving base 19 rotatably supports the shaft 3 via the bearing 19 </ b> A.
[0014]
As shown in FIG. 6 which is a partial cross-sectional view taken along the line EF in FIG. 5, the deflection receiving base 19 has an injection hole 19 </ b> D for injecting compressed air toward the single plate P passing through the gap S portion. It is provided from the side toward the upper side.
[0015]
And as shown in FIG. 5, the space | interval of the surrounding surface of the piercing cylinder material 5 and the surrounding surface of the cylinder material 17 with rubber | gum is arrange | positioned at the length of 1.5 millimeters.
Next, the operation of the embodiment configured as described above will be described. As shown in FIG. 1, a single plate P whose tree species is a radiata pine is carried in a fiber direction between a rotating steel roll 1 and a rubber roll 13. In the veneer P, most of the normal portions where the fiber direction other than the nodes is the carrying-in direction are compression-deformed with urethane rubber, and most of the nodes where the fibers stand in the thickness direction of the veneer P When the urethane rubber is compressed and deformed and passes between the rolls, the moisture contained in the veneer P is sequentially removed to the upper side in the transport direction, and is carried out to the next step. Further, moisture generated and / or collected in the portion of the single plate P located in the gap S is attached to the single plate P in the transport direction from between the rolls by compressed air injected from the injection hole 19D shown in FIG. Rarely move.
[0017]
By repeating the above operation, the veneer P that is sequentially carried in is compressed and deformed with urethane rubber in most of the veneer P in which the fiber direction other than the node is the carry-in direction, and the thickness of the veneer P Urethane rubber is compressed and deformed in most of the nodes where the fibers stand in the vertical direction, and passes between the rolls. Therefore, an unnecessarily large force is not applied to the node, so that the node is rarely broken, and moisture is removed from a normal portion of the veneer.
When experimenting with the above configuration,
A single plate with an initial moisture content of 159% has a moisture content of 87% after moisture removal.
A single plate with an initial moisture content of 166% has a moisture content of 89% after moisture removal,
A single plate with an initial moisture content of 159% has a moisture content of 85% after moisture removal,
A single plate with an initial moisture content of 135% has a moisture content of 85% after moisture removal.
A single plate with an initial moisture content of 172% has a moisture content of 91% after moisture removal,
A single plate with an initial moisture content of 185% has a moisture content of 89% after moisture removal,
It became the value of.
[0018]
Further, as described above, since the injection hole 19D is provided in the bending cradle 19, the injection position of the compressed air is stabilized, and the single plate conveyance path is not obstructed. Therefore, the moisture generated and / or collected in the portion of the single plate P located in the gap S is blown to the upper side in the transport direction by the compressed air injected from the injection hole 19D. There is almost no movement on the board.
[0019]
In the embodiment, as shown in FIG. 5, the distance between the peripheral surface of the piercing tube member 5 and the peripheral surface of the rubberized tube member 17 is 1.5 mm long, so-called single plate P is 4 mm thick. Although it is arranged at 37.5%, according to experiments, it may be 50% or less of the thickness of a single plate. Moreover, 40% or less is good for increasing the removal of moisture.
[0020]
In addition, in the Example, although the pitch with respect to the single plate fiber direction of the piercing body 6 is provided in the grid | lattice form wider than the pitch with respect to a fiber orthogonal direction, the same pitch may be sufficient. However, when the piercing bodies 6 are provided in a lattice shape in which the pitch with respect to the direction of the single plate fiber is wider than the pitch with respect to the direction perpendicular to the fiber, the single plate warp after the conveyance is finished (in FIG. 1, the single plate when viewed from the loading direction) There is little warping in the center.
[0021]
In the embodiment, as shown in FIG. 4, a substantially regular quadrangular pyramid piercing body 6 having two sides substantially parallel to the rotation direction of the roll is provided, but includes a square, a rectangle, a rhombus, a trapezoid, or the like. A pyramid may be used. Further, as shown in FIG. 7, the puncture bodies 6 having a substantially regular four-pyramid shape may be arranged so that the corners face each other. Further, it may be a triangular pyramid, a hexagonal pyramid, or a cone. However, as shown in FIG. 4, the piercing body of the quadrangular pyramid piercing body 6 having two sides substantially parallel to the rotation direction of the roll has a single plate fiber and two sides substantially parallel to each other. And the holding of the veneer is more stable. In addition, a substantially regular quadrangular pyramid piercing body or a rectangular quadrangular pyramid piercing body that is substantially parallel to the roll rotation direction and the roll axial direction is processed when the piercing body is processed into a lattice shape on the roll. Since it is the direction and the axial direction, processing is easy.
[0022]
In the embodiment, as shown in FIGS. 4B and 4C, the tip angle of the piercing body 6 is 100 degrees. However, if it is 90 degrees or more, the veneer is inserted into the piercing bodies 6 and 6 after completion of conveyance. Almost never remains between them.
[0023]
In addition, although the rubber hardness of the urethane rubber of an Example is 98 degree | times, according to experiment, what is necessary is just 94 degree | times or more.
[0024]
The thickness of the urethane rubber of the embodiment is 45 mm, which is a value obtained by subtracting the distance of 1.5 mm between the peripheral surface of the piercing tube member 5 and the peripheral surface of the tube member 17 with rubber from the single plate P thickness of 4 mm. However, the breakage of the node is small if it is 10 times or more the value obtained by subtracting the distance between the peripheral surface of the piercing tube member 5 and the peripheral surface of the rubberized tube member 17 from the thickness of the single plate.
[0025]
【The invention's effect】
In the present invention, when a veneer is carried between a pair of rolls, most of the normal portion of the veneer where the fiber direction other than the node is the carry-in direction is compressed and deformed with synthetic rubber, and the thickness direction of the veneer In most of the nodes where the fibers stand, the synthetic rubber is compressed and deformed and passes between the rolls. Therefore, an unnecessarily large force is not applied to the node, so that the node is rarely destroyed, and more water is removed from the normal portion of the veneer. Further, since the piercing bodies are provided in a lattice shape, the veneer can be stably conveyed.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment.
FIG. 2 is a partial explanatory diagram of an embodiment.
FIG. 3 is a partial explanatory diagram of an embodiment.
4 is an enlarged view of a portion A in FIG.
FIG. 5 is a partial cross-sectional view in which a part of the steel roll 1 and the rubber roll 13 is cut in the axial direction.
6 is a partial cross-sectional view taken along the line EF in FIG. 5;
FIG. 7 is an explanatory diagram of an array in which corners face each other in the lattice-like array of the substantially regular four-pyramidal piercing bodies 6 according to the embodiment.
[Explanation of symbols]
1 .... Steel roll 5 ... Pin tube material 6 ... Puncture body 13 ... Rubber roll 17 ... Rubber tube Material

Claims (5)

The distance between the peripheral surfaces of the pair of rolls whose rotation axes are parallel and at least one of which is driven to rotate is arranged at a length corresponding to 50% or less of the thickness of the veneer single plate to be loaded,
One of the rolls is provided with a lattice-like piercing body having a height in the radial direction of the roll equal to or less than the interval from the peripheral surface to the peripheral surface,
The other roll is made of steel at the center, and a synthetic rubber having a rubber hardness of 94 degrees or more is coated with a thickness not less than 10 times the value obtained by subtracting the interval from the thickness of the veneer single plate. A veneer veneer dewatering device characterized in that The veneer veneer dewatering apparatus according to claim 1, wherein the veneer veneer veneer to be loaded is provided with a piercing body in a lattice shape in which the pitch with respect to the fiber direction is wider than the pitch with respect to the direction perpendicular to the fiber. The veneer veneer dewatering device according to claim 1 or 2, wherein a quadrangular pyramid piercing body having two substantially parallel sides in the rotation direction of the roll is provided. 4. The veneer single plate dewatering device according to claim 1, wherein a substantially regular quadrangular pyramid piercing body is provided substantially in parallel with the rotation direction of the roll. The veneer veneer dewatering device according to claim 1, wherein a piercing body having a tip angle of 90 degrees or more is provided.

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