JPS6144235B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a drying device for drying veneer veneers, etc., and in particular to a device for drying veneer veneers, etc., in which the veneer to be dried is held under pressure between a fixed heating plate and a movable heating plate. Regarding drying equipment.

In general, veneer veneer immediately after being cut with veneer lace contains water with a moisture content of 60 to 100%, so it cannot be used as is, so it must be dried to reduce the moisture content.
It is necessary to dry it to about 10%. For this reason, the so-called hot air ventilation drying method was used in which the veneer veneer was fed into a hot air drying oven, but this method had low thermal efficiency and the veneer veneer would become distorted during drying, resulting in poor quality products. It was difficult to obtain

In order to solve this problem, the applicant first proposed a method in which a veneer veneer is sandwiched between a fixed heating plate and a movable heating plate via an endless stainless steel belt, and the veneer is heated and dried. (Refer to Japanese Patent Application Laid-Open No. 126555/1983).

However, this type of heating plate has a stainless steel endless belt between the heated surface of the fixed heating plate and the movable heating plate and the veneer veneer to be dried, so heat transfer to the veneer veneer is poor, and the use is long. During this period, the endless belt suffered damage due to heat.

Furthermore, without using such an endless belt, for example, a rod-shaped pusher may be brought into contact with the rear edge of the veneer veneer placed on a fixed heating plate, and the veneer veneer may be propelled by this pusher. It is conceivable that in this case, when the movable heating platen is separated after the veneer veneer is hot-pressed, the veneer veneer will shrink, the overall length will become shorter, and the yield of the veneer veneer after drying will decrease. There was a problem. Furthermore, the height of the pusher needs to be lower than the thickness of the veneer veneer during hot pressing, so even if the veneer veneer has a slight warp, the pusher will not be able to be reliably pushed. There was a risk that the position of the veneer veneer in the advancing direction would shift or the veneer veneer would overlap.

Therefore, an object of the present invention is to provide a drying apparatus equipped with a fixed heating platen, a movable heating platen that can approach and move away from the fixed heating platen, and a conveyance mechanism for conveying a veneer to be dried between these heating platens. To provide a drying device in which the veneer to be dried is directly hot-pressed by both heating plates, the veneer veneer placed on the heating plate is reliably conveyed, and the yield of the veneer veneer after drying is improved. It's about doing.

An embodiment of the drying apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a cross section of a part of an embodiment of the present invention, and FIG. 2 is a side view thereof.

In the figure, the fixed heating platen 1 is composed of small heating plates 1a, 1a, ... 1a that are divided into a plurality of pieces along the conveyance direction (indicated by arrow A) of the veneer veneer V. The heating plates 1a, 1a, . . . 1a are fixed on the fixed surface plate 2 with predetermined gaps 3, 3, . The fixed surface plate 2 has its central portion supported and its four corners fixed to frames 5, 5, . . . 5. frame 5,
Beams 6, 6 are installed above the veneers 5, . Fixed surface plate 2
Immediately above the support legs 4, 4 are pressure cylinders 8, 8.
is fixed with the rams 9, 9 facing downward. A movable surface plate 11 is fixed to the operating ends of the rams 9, 9 via a split flange 10, and a heat insulating material (not shown) is provided on the lower surface of the movable surface plate 11, similar to the fixed surface plate 1. The movable heating plate 12 is fixed via the. The movable heating platen 12 includes small heating plates 1a and 1 that constitute the fixed heating platen 1 along the conveyance direction of the veneer veneer V.
It consists of small heating plates 12a, 12a, 12a divided into widths approximately 1.5 times that of a, 1a. 1
3 and 13 indicate gaps between the respective small heating plates 12a and 12a. In addition, the small heating plate 12 that constitutes the movable heating plate 12
For a, if necessary, one with the same width as the small heating plate 1a constituting the fixed heating plate 1 and one with a narrower width may be used in combination so that the gaps 3 and 13 do not match. It's okay. Further, in the case of a thin veneer, the gaps 3 and 13 may be arranged vertically to coincide with each other. Furthermore, guide flanges 14a and 14b are provided at the four corners of the fixed surface plate 2 and the movable surface plate 11, respectively, and the movable surface plate flange 1 at the corresponding position is provided with guide flanges 14a and 14b.
4a and the through hole of the guide flange 14b of the fixed surface plate 2 are communicated with each other, and guide rods 15, 15, . The movable surface plate 11 is connected to this guide rod 1.
5, 15, . . . 15. Guide flanges 14a, 1 of guide rods 15, 15,...15
A pair of guide rings 17a, 17b each having fixed support members 16a, 16b are loosely inserted between the upper support members 16a, 16a.
Between and between the lower support members 16a and 16b,
Stay 1 placed perpendicular to the plywood veneer transport direction
The ends of 8a and 18b are fixed.

Note that springs 19b, 19b are inserted between the lower guide rings 17b, 17b and the guide flanges 14b, 14b of the fixed surface plate 2, respectively.
Support members 16b, 16b are elastically supported such that the upper surface of the stay 18b is located near the upper surface of the fixed surface plate 2. On the other hand, fixed rings 20a, 20a are fixedly installed on the guide rings 17a, 17a above the guide rods 15, 15.
Spring 19a, 19a is inserted between 20a and support members 16a, 16a, and guide ring 1
7a and 17a are locked by stoppers (not shown) such that the lower surface of the stay 18a is positioned near the lower surface of the movable surface plate 11.

Between each small heating plate 1a, 1a and 12a, 1 on the lower surface of the stay 18a and the upper surface of the stay 18b.
Rail support members 21 are provided at positions corresponding to gaps 3, 3, ... 3 and 13, 13 between 2a, respectively.
a, 21a and 21b, 21b,...21b are attached, and these rail support members 21a, 21
a and 21b, 21b, ...21b, and guide rails 22a, 22a and 22
b, 22b, ... 22b are the gaps 13, 13 and 3 between the small heating plates 12a and 12a and between 1a and 1a,
3, . . . 3, each guide surface is arranged to protrude from the heating surface of the heating plate. On these guide rails are endless chains 23a, 23a and 23b, 23, both ends of which are hung parallel to sprockets, which will be described later.
b, . . . 23b are arranged. Endless chain 23
As shown in Fig. 3, a and 23b have a structure in which a protruding part b is formed on a link a, and a tread c is fixed to this protruding part b, and a roller d on the opposite side of the tread c is attached to the link a. Place the peripheral surface on the guide rails 22a, 22b and press the veneer veneer V with the surface c of the tread plate while moving the guide rail 2.
2a and 22b.

In addition, in FIGS. 1 and 2, the tread c
It shows a state in which the veneer veneer V is held between the sides,
For this reason, each tread c surface of the endless chain is made of a single plywood V.
The springs 1 are arranged at intervals corresponding to the thickness of
9a, 19a, 19b, 19b, etc., the treads c of the lower endless chains 23b, 23b, . The treads c are arranged laterally in a slightly staggered manner.

As schematically shown in FIG. 4, the drying apparatus of this embodiment includes a fixed heating plate 1 and a movable heating plate 12.
are arranged in series, each having two endless chains.
3a is attached to the sprockets 24a, 24a, and the endless chain 23b is attached horizontally to the sprockets 24b, 24b to drive the sprockets 24a, 24b. A driving mechanism (not shown) drives the two heating plates 1, 1 arranged in series. Alternatively, it is driven at a constant speed in the veneer transport direction indicated by arrow A throughout the space between 12 and 12.

Note that the pressure cylinders 8, 8, 8, 8 are synchronously driven in the direction of arrow B.

At this time, in order to prevent the endless chain 24a on the movable hot platen 12, 12 side from becoming slack and falling off the guide rail, the movable hot platen 12, The floating sprocket 25c disposed between the movable hot platens 12 and 12 moves upward or forward to absorb the slack in the endless chain 23a caused by the upward movement of the movable hot platens 12, 12. The fixed heating plates 1, 1 and the movable heating plates 12, 12 are heated to a predetermined temperature by a heat source such as heated steam, thermo oil, or electric heat. A veneer veneer loading table 25 is arranged at the front end of the fixed heating platen 1 on the veneer veneer inlet side, and an unloading table 26 is arranged at the rear end of the fixed heating platen 1 on the veneer veneer outlet side.
27, 27, ... 27 are height-adjustable stoppers for regulating the thickness of the veneer veneer, which are protruded from the four corners of the movable heating plates 12, 12, and prevent the veneer veneer from being pressed more than necessary. It's getting old.

Next, the operation of the device of the present invention will be explained.

As shown in FIG. 4, the veneer veneer V sent from the carry-in table 25 between the endless chains 23a and 23b is transferred to the endless chain 23 driven in the direction of arrow A.
It is clamped from above and below by the treads c of veneers a and 23b and sent onto the fixed heating plate 1, and once the rear edge of the veneer V is positioned on the fixed heating plate 1, the endless chain 23
a, 23b are stopped.

This stopping may be done manually, or may be done automatically using a sensor such as a photoelectric element or a limit switch.

Here, the left half of FIG. 5 shows this state of the apparatus shown in FIGS. 1 and 2, that is, the endless chains 23a, 23a and 23b, 23b, .
3b shows a state where the veneer veneer V is clamped and stopped for heating and pressurization. Endless chain 23a,
After 23b stops, the pressure cylinders 8, 8 are driven and the movable hot platen 12 starts to descend, and first, the heating surface of the movable hot platen 12 contacts the veneer veneer V and pushes it downward. Due to the pressing force of the movable heating plate 12, the lower guide rails 23b, . will come into contact with. At this time, the upper guide rails 22a, . . . follow the movement of the veneer veneer V by the elastic force of the springs 20a, 20a and descend, and finally, as shown in the right half of FIG. 5, the endless chains 23a, . 23a and 23b, 23b, 2
3b, the veneer veneer V is pressed and heated by the movable heating plate 12 and the fixed heating plate 1 while being held in the sandwiched state.

In this way, after hot-pressing for a certain period of time, the movable hot platen 12 rises, and then the lower guide rails 22b, . . . also rise, but during this time the veneer veneer V is
a, 23a and 23b, 23b, .

After the movable heating plate 12 is raised, the endless chain 23a,
23a, 23b, 23b, ...23b are driven synchronously, the veneer veneer V is conveyed onto the next heating platen, and at the same time a new veneer to be dried is fed onto the heating platen on the inlet side and the same operation is carried out. Repeated.

In addition, the endless chains 23a and 23b of the above embodiment
In this case, a chain with a tread c fixed to it was used, but as shown in Fig. 6, an endless chain 23a, 2
It is also possible to replace the link a constituting the link 3b by molding the link a to form the pressing part p.

Furthermore, as shown in FIGS. 7 and 8, an attachment f is provided in which a projecting portion b is formed on the link a constituting the endless chains 23a and 23b, and a protruding body e is implanted on the upper surface of the projecting portion b. Insert a bolt into the bolt hole g and tighten and fix it, or as shown in FIG. An anvil roll for pressing the endless belts 23a and 23b against the veneer veneer V may be arranged at the opening so that the piercing body e can be pierced into the veneer veneer V.

In this case, cracks are formed in the veneer veneer V by being pierced by the piercers e, so that drying efficiency is improved and shrinkage of the veneer veneer V is more reliably prevented.

FIG. 9 shows an example of application of the apparatus according to the embodiment of the present invention shown in FIG.
and the entire housing 30 except for the outlet 29
covered with. This housing 30 is provided with a ventilation port 31 for releasing water vapor.

In this application example, since the entire device is covered by the housing 30, the thermal efficiency of drying is further improved.

Furthermore, in the above embodiments, an example in which a fixed heating platen and a movable heating platen were divided in the veneer transport direction was explained, but the present invention is not limited to such an embodiment. It is also possible to form a concave groove in which the heating plates can be stored and to construct each heating plate in one piece. Furthermore, as shown in FIG. 10, the fixed heating platen 1 and the movable heating platen 12 may be configured to be divided along the conveying direction of the veneer veneer in order to promote the evaporation of moisture during hot pressing. In this case, in order to prevent uneven drying, it is desirable that the divided portions of the fixed heating platen 1 and the movable heating platen 12 be formed at different positions as shown in the figure.

Furthermore, the endless chain can be replaced with a belt or other endless band that performs the same function.

It is of course possible to cover the device of the embodiment shown in FIG. 10 with a housing as in the applied example shown in FIG. 9.

As explained in detail above, according to the present invention, the veneer to be dried is clamped by the endless band throughout the drying process, so it does not shrink even when the movable heating plate is raised, and therefore the yield is reduced. The decline is prevented,
Furthermore, it is possible to transport the veneer veneer in an orderly manner. Furthermore, if a piercing body for piercing a veneer veneer is formed on the endless chain and the piercing body is made to pierce the veneer veneer, the above effects will be further enhanced and the drying efficiency will also be improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main parts of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an exploded perspective view of an endless chain used in the present invention, and FIG. 4 is an embodiment of the present invention. 5 is a front view showing the operation of the apparatus of the present invention, FIG. 6 is a side view showing an endless chain in another embodiment of the present invention, and FIGS. 7 and 8. 9 is an exploded perspective view showing an endless chain used in still another embodiment of the present invention, and FIG. 9 is a side sectional view schematically showing an application example of the present invention.
FIG. 10 is a side sectional view schematically showing another embodiment of the present invention. 1... Fixed heating plate, 1a... Small heating plate, 3, 13... Gap, 8... Pressure cylinder, 12... Movable heating plate, 12a
...Small heating plate, 19a, 19b...Spring, 21
a, 21b...Rail support member, 22a, 22b...
Guide rail, 23a, 23b...endless chain, V...
Veneer veneer.

Claims (1)

[Scope of Claims] 1. A drying device equipped with a fixed heating platen, a movable heating platen that can approach and move away from the fixed heating platen, and a transport mechanism for transporting a veneer to be dried between these heating platens. , each of the concave grooves continuous in the conveying direction of the veneer on both heating plates is elastically biased, and normally protrudes from the heating surfaces of both heating plates and is pressed against the elasticity. It is stored in the groove. A drying device characterized in that a guide rail that can freely appear and retract is provided, and an endless band that is driven in the veneer transport direction by a drive mechanism is stretched across each of these guide rails. 2. The drying device according to claim 1, wherein the endless band is made of an endless chain. 3. The grooves formed on the fixed heating plate and the grooves formed on the movable heating plate are formed at different positions in a direction perpendicular to the direction of transport of the veneer.
The drying device according to item 1 or 2. 4. The drying device according to any one of claims 1 to 3, wherein the endless band has a large number of protrusions arranged on the pressing surface of the veneer.