JPS6142184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direct heating type veneer drying device, a so-called hot plate type veneer drying device, and its object is to provide a veneer drying device with good thermal efficiency using a simple and compact mechanism. An object of the present invention is to provide a board drying device.

Conventionally, hot air ventilation methods and hot platen drying methods have existed as devices for drying veneer veneers (hereinafter referred to as veneers), but the hot platen drying method, in which the hot platen is brought into direct contact with the veneer to dry it, is better. It is already known that it has excellent thermal efficiency. However, this heating plate drying method has drawbacks such as heat and time loss associated with loading and unloading the veneers, and the bulk of the equipment, including the mechanism for loading and unloading the veneers, making it difficult to put into practical use. However, the reality is that it is only used in very limited fields such as extremely thick veneer. Furthermore, the endless band heating type, which uses a heated steel belt etc. to continuously transport veneers, is no exception, and its mechanism is more complex and larger than the purpose of simply transporting veneers continuously. This is a major hindrance to the practical application of the device.

The present invention aims to eliminate the various drawbacks of the conventional apparatus, and to provide a veneer drying apparatus which is excellent in both thermal efficiency and operating rate, and has an extremely simple structure.

In order to make it easier to understand the present invention, I will first explain its basic principle. For example, when you place a tip on a piece of paper on a desk, it takes a considerable amount of force to pull the paper by hand. However, if you tap the desk with one hand, you can pull the paper with surprisingly little force. On the other hand, it may seem impossible at first glance to push the paper into the bottom of the cup, but this can also be accomplished quite easily by hitting the desk and making it vibrate.
The basic principle of the present invention is to vibrate the restraining member to release or reduce the restraining force on the object and move the object with an extremely small force. In the present invention, the pressure plate is used as the vibrating restraining member.

Furthermore, experiments have shown that when drying a veneer by bringing the heating plate into direct contact with the veneer, the heating plate does not necessarily have to touch the entire surface of the veneer, and even if there is some non-contact space, it will not dry. It was confirmed that moisture movement occurred inside the board and there was no problem with drying. Therefore, in the present invention, we focused on this point, provided an appropriate non-contact space in the heating platen, utilized the non-contact space to arrange a veneer conveying member, and heat-pressed the veneer while continuously conveying it. It is designed to perform drying.

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 as a side view and as shown in FIG. On the veneer clamping surfaces of clamping pressure plates 2 and 3,
Running grooves 4, 4a are bored in the veneer transport body extending in the direction of transport of the veneer, and rotors 5, 5a rotated by a drive device such as a motor (not shown) are installed in the grooves 4, 4a to run. The carriers 6 and 6a are arranged so that the veneer 1 can be sandwiched and transported from above and below. The groove and the veneer conveyor disposed there need only be present on at least one side of the top or bottom, but it is better to provide it on both the top and bottom as in the illustrated embodiment in order to reliably convey the veneer. desirable.

On the other hand, below the clamping pressure plate 3, there is a vibration mechanism 8 for vertically vibrating the upper and lower clamping pressure plates 2 and 3, for example, cams 7 and 7 that continuously rotate in the direction of the arrow, and a cam shaft 1.
0, or a vibrating mechanism consisting of a crank, a rod, etc. (not shown) is provided, and the clamping pressure plates 2, 3 are
A heating mechanism such as electric heating is attached inside to heat the veneer. As this heating means, conventionally known heating means can be used, such as passing a heat medium such as steam or heat oil through the inside of the clamping plate, or directly heating the clamping plate with a gas burner. In order to promote and equalize drying, it is desirable to provide a heating mechanism on both the clamping plates 2 and 3. Moreover, at least one of the clamping pressure plates 2 and 3,
By configuring the clamping pressure plate to be substantially divided into a plurality of pieces, it is possible to make the contact between the clamping pressure plate and the veneer closer. For example, as shown in the figure, the upper clamping pressure plate 2 can be
If the clamping pressure pieces 2a are divided into a plurality of clamping pressure pieces 2a and each clamping pressure piece 2a moves up and down separately to contact the surface of the veneer 1, pressure can be applied even if the thickness of the veneer 1 is uneven. , the heating is more uniform and good. In this way, the clamping plates 2 and 3 directly contact the surface of the veneer 1 to dry it, so they may be made of metal such as copper or aluminum, or an alloy thereof, or plated with chromium, nickel, etc. A material with good thermal conductivity is used, but iron, which reacts with the sap of the veneer, will turn the surface of the veneer black, so it is best to avoid using it as much as possible.

Next, FIGS. 3 and 4 show another embodiment of the present invention, in which the lower clamping pressure plate 3 of the opposing clamping pressure plates 2 and 3 is fixed, and only the upper clamping pressure plate 2 is vibrated. It is configured to move up and down by a mechanism 8. The vibration mechanism 8 includes a spring 11, a pressure plate 12, and a connecting rod 1 provided behind the upper clamping pressure plate 2.
The rotation of the eccentric shaft 14 causes the pressing plate 12 to move up and down, and the elastic force of the spring 11 causes the clamping plate 2 to vibrate up and down. Further, in this device, a running groove 4 is formed only in the lower clamping pressure plate 3, and the veneer 1 is conveyed by a conveying body 6 disposed in the running groove 4. There is.

In addition, if the clamping pressure plate vibration mechanism 8 shown in FIG. 3 is used, opposing clamping pressure plates are arranged on the left and right, and the veneer is inserted between them in an upright state while vibrating the clamping pressure plates from side to side. This is also possible, and the present invention is of course intended to be implemented even in cases where such clamping pressure plates are arranged on the left and right sides.

Since the present invention is configured as described above, the inserted veneer is moved between both sides by running the veneer conveyor and heating the clamping plate while vibrating it by the clamping plate vibration mechanism. It is dried by heat and pressure while being sequentially conveyed between clamping plates. That is, by vibrating at least one of the pair of clamping pressure plates, the restraining force on the veneer inserted between both clamping pressure plates can be temporarily released or reduced to a force. The veneer can be easily transported in a state where it is always in contact with the veneer clamping surfaces of both clamping pressure plates.

As described above, the present invention performs hot pressing while continuously conveying the veneer, so it has the advantages of the hot platen drying method, which is an excellent method for drying veneers, namely, improved thermal efficiency and the accompanying heating time. Not only is the time taken to be shortened, but since the veneers can be carried in and out continuously, there is no loss of heat or time associated with opening the heating plate. In addition, since the carrier is disposed within the running groove, the carrier travels while being regulated by the running groove, which makes it possible to maintain the correct posture of the veneer and to maintain the correct posture of the carrier. There is no need to separately provide a travel regulation mechanism, and the entire device can be made smaller. Furthermore, as the force that restrains the veneer is released or reduced by vibration, it is possible to prevent shrinkage cracks in the veneer that occur during drying, and furthermore, by dividing the clamping pressure plate into smaller pieces, drying can be made more uniform. This has a great effect on improving the quality of veneers.

The above explanation has only been about drying veneers, but if the veneer to be dried is replaced with glued plywood, it can function as a press device that can perform continuous pressing, and its use can be improved. The degree is wide-ranging.

[Brief explanation of the drawing]

The drawings show an example of carrying out the present invention; FIG. 1 is a side view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a side view showing another embodiment, and FIG. 4 is a side view. It is a BB sectional view in FIG. 3. 1... Plywood veneer, 2, 3... Clamping plate, 4, 4
a... Running groove portion of the veneer transport body, 6, 6a... Transport body, 8... Vibration mechanism of the clamping plate.

Claims (1)

[Scope of Claims] 1. A pair of clamping plates that are arranged opposite to each other so as to clamp and press the inserted veneer veneer from both sides, and at least one of the veneer clamping surfaces is provided with a running groove for the veneer conveyor. a veneer conveyor disposed in the travel groove to convey the veneer veneer; and a clamping pressure plate that vibrates at least one of the pair of clamping pressure plates in the thickness direction of the veneer. A veneer drying device comprising a vibration mechanism and a heating mechanism that heats at least one of the pair of clamping pressure plates. 2. The veneer drying device according to claim 1, wherein the clamping pressure plate of the pair of clamping pressure plates that is vibrated by the clamping pressure plate vibration mechanism is divided into a plurality of clamping pressure pieces.