JPS63212501A - Heat treatment equipment for veneer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a heat treatment apparatus for veneer veneer.

Conventionally, a heating device for heat-treating a veneer veneer (hereinafter simply referred to as veneer) and drying the veneer has been used, for example, a "continuous press drying device for materials such as thick veneers" (Utility Model Publication No. 59-3).
Publication No. 4872)・``Drying device for plate materials'' (Special Publication No. 1983)
As disclosed in Japanese Patent Publication No. 12547), a pair of endless strips are arranged opposite each other so as to be able to run intermittently to form a conveyance path for the veneer, and a pair of heating plates are placed oppositely inside each endless strip. , and at least one of them is arranged so that it can be raised and lowered, and the veneer is repeatedly heated by a heating plate via the endless band while the veneer is intermittently conveyed by the endless band. This device is well known and, in principle, has better thermal efficiency than other heating devices such as hot air vent type heating devices, and was expected to contribute to the development of industry. However, in reality, it has various drawbacks. However, there were very few examples of this being put into practical use.

Therefore, the inventor of the present invention first pointed out that one of the biggest drawbacks that hindered the generalization of the above-mentioned type of device is that conventional devices of this type cannot accurately grasp the running characteristics of the endless belt. First, we analyzed and clarified that the device itself became long because it adopts a configuration in which a pair of endless bands are placed vertically opposite each other to form one level conveyance path, and we also solved the aforementioned drawbacks. As extremely rational countermeasures that can reduce the problem, for example, ``Drying device for veneer'' (Patent application No. 237679, 1982) and ``Method for adjusting the trajectory of an endless band in a device for drying veneer'' (Patent application No. 61, 1983) -2
As disclosed in No. 42276), we proposed a new type of device with a unique meandering conveyance path and a configuration in which multiple pairs of heating plates were arranged, and attempted to improve its practicality. Subsequently, during the development process of the present invention, it was newly discovered that it was necessary to solve another difficulty in putting the invention into practical use.

In other words, since the veneer dried using the above-mentioned type of equipment is extremely hot, it is difficult to directly transfer it to post-processing processes such as gluing and flattening processes; Even when transferring to the post-processing process, the accumulated internal veneer remains warm for a long period of time, so it is a problem to transfer it to the post-processing process early, so in any case. For practical use, it is necessary to use an appropriate cooling mechanism to cool the veneer to an appropriate temperature.

On the other hand, since the above-mentioned type of equipment transports and processes the veneers intermittently during the process, the cooling by the cooling mechanism is also carried out mainly when the transport of the veneers is stopped. efficient and, as a result, the cooling capacity of the cooling mechanism (
In this case, the length of the cooling area of the cooling mechanism with respect to the veneer conveyance direction and the conveyance distance per veneer conveyance have a certain relationship. If the veneer is not cooled and is disordered, the cooling period for the veneer will be different for each local part of the veneer, causing local uneven cooling of the veneer. If the range is not covered, even if the cooling capacity of the cooling mechanism is necessary and sufficient, there is a risk that part of the veneer will not be cooled to an appropriate temperature.

The present invention solves the problems newly found to occur in heat treatment equipment that uses a cooling mechanism in combination with this type of heating equipment, including the above-mentioned new type of equipment, by implementing a rational configuration as follows. It was developed to solve this problem. Specifically, a pair of endless strips are installed opposite each other so that they can run intermittently to form a transport path for the veneer, and an appropriate number of pairs are placed inside each endless strip. The heating plates are arranged opposite to each other so that at least one of them can be raised and lowered, and a cooling mechanism is arranged at or near the end of the conveying path, and the veneer is heated by an endless belt. In the process of intermittent conveyance, the veneer is repeatedly heated through an endless band by a heating plate, and then cooled by a cooling mechanism. , characterized in that the length of the cooling area of the cooling mechanism is associated with the conveyance distance of the veneer per time so that the length is an integral multiple of the conveyance distance of the veneer per time. This is a veneer heat treatment equipment.

According to the above configuration, since the length of the cooling area of the cooling mechanism in the veneer transport direction is an integral multiple of the veneer transport distance per time, the length of the cooling area in the veneer transport direction is an integral multiple of the veneer transport distance per time. too,
Since the cooling mechanism receives cooling for the same period of time, there is no risk of localized uneven cooling, and the cooling is done evenly, which is effective.

Hereinafter, the present invention will be described in further detail with reference to an example of implementation illustrated in the drawings.

The heat treatment apparatus according to the present invention includes, for example, as shown in a schematic side view in FIG.
A plurality of rolls la, 1b and 2a, 2b are stretched, and either one of the rolls la or lb and 2a or 2
b, and is caused to travel intermittently in the direction of the arrow shown in the figure by a drive source (not shown). A pair of endless bands 1 and 2,
In order to repeatedly heat the veneer lO through the endless band l.2,
Appropriate pairs of heating plates 3-4 are disposed inside each of the endless bands 1 and 2 to face each other, and one of them is raised and lowered as shown by the dotted line by a lifting mechanism 5 such as a fluid cylinder, for example;
Pulleys 6a, 116b, 6C and belts 6d, 6e are used to synchronously transport the veneer 10 that is intermittently sent out from the endless belts 1 and 2 through the veneer guide 7 which also serves as a member for scraping off deposits. The endless belts 1 and 2 are transported intermittently in the direction of the arrow shown by the same or different drive source (not shown), in synchronization with the endless belts 1 and 2, with a transport distance P per time. In order to cool the veneer lO carried out by the carrying-out conveyor 6 and the carrying-out conveyor 6, the carrying-out conveyor 6 has blower fans 8a, 9a, and blow boxes 8b, 9b, respectively. It is equipped with a pair of blowers 8 and 9 arranged oppositely, and the length L of the cooling (air blowing) area of the blowers 8 and 9 with respect to the conveyance direction of the veneer 10 is
It is characterized in that it is associated with a length that is an integral multiple (twice in the embodiment) of the conveyance distance P of the single plate 10 per time.

According to the heat treatment apparatus having the above configuration, the veneer 10 carried in from the left side of the figure is transported intermittently by the endless belts 1 and 2, while the heating plate 10 synchronizes with the stop of the endless belts 1 and 2. 4 is repeatedly heated through compression by the heating plate 3 @ 4 via the endless belt 1.2, and then transferred to the discharge conveyor 6.
In the process of being transported more intermittently, when the unloading conveyor stops for the 6th time in synchronization with the stop of the endless belt 1-2, it is intensively cooled by air blowing from the blowers 8 and 9, and is eventually transported to the right side of the figure. However, since the length L of the cooling area of the blowers 8 and 9 in the conveying direction of the veneer 10 is an integral multiple of the conveying pressure #P of the veneer 10, No matter which part of the plate 10 is located, cooling by the blowers 8 and 9 is carried out.
Since the cooling is applied for the same period of time, there is no risk of localized uneven cooling, and the cooling is done evenly, which is effective.

To prove this by giving an example, as illustrated in FIG.
On the other hand, assuming that the length it is placed inside and the length fL2 is left outside, the blowers 8 and 9 reach the rear end B through the process shown in the figure, but between A and 8. length L=2
Since the setting is F, the lengths located outward and inward with respect to the rear end B are 1 and 12, respectively. Cooling (cooling in a stopped state) is performed the same number of times (two times in total in the example), and the thermal theory and cooling time during the transportation process are uniform in all parts, so as a result, The period of cooling is the same for all parts.

Note that the cooling capacity of each blower may be set appropriately according to the required cooling temperature of the veneer, but in the above embodiment, the blower used as a cooling mechanism does not have a very pronounced cooling function, so It is suitable for relatively light cooling, and the accuracy of the length of the cooling area relative to the conveyance distance per veneer is rougher than that of the cooling plate in the example described later, and the tolerance range is comparable. It has a wide range of characteristics.

Further, in the above embodiment, the blowers used as the cooling mechanism were provided in pairs on both sides of the veneer, but considering the above characteristics, the arrangement is not limited to pairs; for example, as illustrated in FIG. , there is no practical problem even if it is provided alone on the side of the veneer, or there is no practical problem even if it is provided only on one side of the veneer, although illustration is omitted.

Next, in the embodiment illustrated in FIG. 4, the veneer lO is intermittently conveyed in the direction of the arrow in the figure by a drive source (not shown) via the rolls lla*12a, with a conveyance distance P1 per time. An appropriate number of pairs of heating plates 13 and 14, one of which is raised and lowered by a lifting mechanism (not shown), as shown by the dotted line, inside each of the pair of endless belts 11 and 12 being run;
The length Ll of the cooling area (cooling surface) in the running direction of the endless belt 11-12 is equal to the conveying distance P1 of the veneer 10 per time, and one side is raised and lowered by the lifting mechanism 19a as shown by the dotted line. It is equipped with two pairs of cooling plates 18 and 19 facing each other, and the endless band 11 is connected through a single plate guide 17.
The single plate lO sent out intermittently from @12 is connected to pulley 1.
6a1116b and belts 16d and 16e, the same or different driving source as the endless belt 11-12 (not shown)
This heat treatment apparatus is configured to be carried out by a carrying out conveyor 16 which is intermittently moved in the direction of the arrow in the figure in synchronization with the endless belt 11-12.

Even in the heat treatment apparatus having the above configuration, the endless belt 11.1
2, the length of the cooling area of the cooling plates 18 and 19 in the running direction is an integral multiple of the transport distance PI per single plate lO (in the example, each cooling surface is 1 time, so the total is 2 times). Therefore, any part of the veneer 10 is cooled g118, g19
It is effective because cooling is received evenly for the same period of time without causing local uneven cooling, and even if the cooling mechanism is divided into multiple parts, the required If the length of the cooling area of each cooling mechanism is an integral multiple of the conveyance distance of the veneer, the existence of the interval S formed between each cooling mechanism will reduce the cooling of the veneer. It has no effect on the period.

To prove this by giving an example, for example, as shown in FIG. 5, when a veneer 10 having an arbitrary length or length is processed, as is clear from the figure, cooling by the front cooling plates 18 and 19 is initially performed. The parts that received the cooling will not be cooled next time, and the parts that will be cooled next time by the rear cooling fi18-19.

Since it is not cooled the third time, each part of the veneer 10 is cooled twice in total, and the existence of the 1-spacing S has no effect on the cooling period of the veneer. Neither the length nor the shortness has any effect on the cooling period of the veneer.

In the above embodiment, the cooling plate used as the cooling mechanism can perform a remarkable cooling function by setting the temperature of the cooling medium such as cooling water as necessary. It is suitable for cooling, and although the accuracy of the length of the cooling area relative to the conveyance distance per veneer needs to be more accurate than that of the blower in the previous embodiment, it is possible to cool the veneer through an endless band. Because of the treatment, a passive cooling effect is exerted even in the vicinity of the cooling plate, so errors are allowed within a range that corresponds to conditions such as the required cooling temperature and heat retention of the veneer.

As is clear from the above, according to the heat treatment apparatus according to the present invention,
This is effective because the veneer is cooled evenly.

Note that the forms of the endless belt and the heating plate are not limited to the forms illustrated in each embodiment, and although not shown in the drawings, they may form a meandering conveyance path like the above-mentioned new type of device, and However, in any case, the above correlation is the length of the heating area of the heating plate with respect to the running direction of the endless band and the length of the veneer by the endless band. This also holds true for the conveyance distance per run, so the length of the heating area of the heating plate in the running direction of the endless belt should also be set to an integral multiple of the conveyance distance of the veneer per run by the endless belt. desirable.

As a heat source for each heating plate, heating steam is relatively inexpensive and convenient.However, for the heating plate located above the conveyance path, the applicant first published a report on February 9, 1988. It is effective to smoothly eliminate drain by utilizing the technology disclosed in the utility model registration order (name of the invention, veneer heating device) submitted with the application, that is, the technology to raise the container non-horizontally when it is raised. However, in addition to these, various conventionally known heat sources may be used, such as heating oil, electric heaters, etc.

Further, it is preferable that the endless band is made of stainless steel,
Alternatively, if necessary, the heating surface of each heating plate may be moved in any direction, as disclosed in "Heating plate for drying veneer" (Japanese Patent Application No. 152241/1988) previously submitted by the present applicant. On the other hand, it may be formed in a convex shape.

Furthermore, in the case where either the heating plate or the cooling plate is substantially divided into a plurality of parts, the set temperature thereof does not necessarily have to be uniform, and furthermore, in the above embodiment, the temperature of the conveyor path may vary. Although the heating and cooling plates located below are arranged so that they can be raised and lowered,
There is no problem even if the heating plate and cooling plate located above the conveyance path are disposed so as to be movable up and down, and if necessary, both can be configured to be movable up and down in synchronization.

[Brief explanation of the drawing]

The drawings are for explaining the invention. Fig. 1 is a schematic side view of the heat treatment apparatus according to the present invention, Fig. 2 is an explanatory view schematically illustrating the conveyance progress of the veneer in the apparatus illustrated in Fig. 1, and Fig. 3 is an illustration of the blower. 4 is an explanatory plan view of another embodiment of the heat treatment apparatus according to the present invention; FIG. 5 is a side view of a main part of another embodiment of the heat treatment apparatus according to the present invention; FIG. FIG. 2 is an explanatory diagram schematically illustrating. l, 2, 11. x2-...Endless band, 3.4゜13.14
... Heating plate, 6,16... Unloading conveyor, 7φ...
Single plate guide, 8, 9...-Blower, 10... Own vehicle plate, 1
8.19... Heating plate, L... Length of the cooling area of the blower relative to the conveying direction of the veneer, Ll@-- Length of the cooling area of the heating plate relative to the conveying direction of the veneer, P, Plφ・・Transport distance per veneer

Claims (1)

[Claims] 1. A pair of endless strips are disposed opposite each other so as to be able to travel intermittently to form a conveyance path for the veneer veneer, and an appropriate number of pairs of heating plates are placed oppositely inside each endless strip. and at least one of them is disposed so as to be able to rise and fall, and a cooling mechanism is disposed at or near the end of the conveyance path, and in the process of intermittently conveying the veneer veneer by the endless belt, A heat treatment device that repeatedly heats a veneer veneer through an endless band using a heating plate, and then cools it by a cooling mechanism, and the length of the cooling area of the cooling mechanism in the direction of conveyance of the veneer veneer is equal to the length of the veneer veneer. The length should be an integral multiple of the conveyance distance per transfer.
A veneer veneer heat treatment apparatus, characterized in that the length of the cooling region of the cooling mechanism is correlated with the conveyance distance of the veneer veneer per one time. 2. The veneer veneer heat treatment apparatus according to claim 1, which uses as a cooling mechanism an air blower attached to an unloading conveyor that runs intermittently in synchronization with the endless belt. 3 An appropriate number of pairs of cooling plates are arranged inside each endless band and facing each other on the lower side in the running direction of the endless band than the heating plate, and at least one of them is arranged so that it can be raised and lowered. ,
A veneer veneer heat treatment apparatus according to claim 1, which is used as a cooling mechanism.