JPS5818151Y2 - Feeding device in veneer dryer - Google Patents

Description

[Detailed description of the invention] This invention relates to a feeding device for a veneer dryer.
The aim is to provide a device for preventing breakage of continuously dried strips of veneer veneer.

Conventionally, for example, a device described in Japanese Patent Publication No. 48-32322 has a feeding net that is continuously rotated over the entire length of the dryer, and two presser nets placed opposite each other on the upper surface of the feeding net. It consists of a group of nozzles that spray hot air onto the inner surface of the veneer being fed.

The speed of the feeding net is adjusted so that the finished moisture content is averaged, and the speed of the holding net on the loading side of the two holding nets is adjusted so that it is faster than the feeding net in anticipation of the amount of shrinkage of the veneer. However, the other holding net on the unloading side is set to the same speed as the feeding net.

However, the amount of shrinkage of veneer reaches 5 to 10%, but it is relatively small until the moisture content drops to about 30% (it only shrinks around 3%), but it is usually used after drying to less than that. At that time, rapid contraction occurs.

Normally, the veneer is held between a feeding net and a holding net, and since the weight of the holding net is added, the veneer must overcome the resistance and contract, and this force causes the veneer to shrink. Breakage occurs along the fiber direction, resulting in a decrease in quality and a significant decrease in yield.

In this type of continuous dryer, the veneer is continuously conveyed in a direction perpendicular to the fiber direction.

Therefore, there are dryers that have improved this and have multiple presser conveyors running around the tea rack, which have a smaller mass compared to nets such as wide chains or spring belts, but even these dryers are lighter than nets. However, the problem of the veneer breaking due to the weight of the entire conveyor being applied to the veneer has not been solved satisfactorily.

The present invention eliminates the above-mentioned conventional drawbacks and provides a new and improved drying device that prevents breakage of continuously dried strip veneer.

That is, the present invention has a plurality of presser conveyors on the top of the feed net, at least two or more in series from the veneer loading side to the veneer loading side, and the feeding speed of the presser conveyor located on the veneer loading side In a continuous drying device for veneer veneer, which is faster than the feeding speed of the feeding net, all of the presser conveyors or the presser conveyor on the unloading side are set such that the presser conveyor is moved upwardly from the feed net at regular intervals. A reciprocating device is installed to raise and lower the veneer so that frictional force and shrinkage force are not generated on the veneer, allowing the veneer to be released freely and eliminating breakage.

This will be explained below according to the drawings.

1 indicates the whole dryer, S indicates a belt-shaped raw veneer 2 is a feeding net, 3 indicates a chain or a plurality of holding conveyors such as spring belts provided on the loading side of the veneer S, and the feeding net 2
rotate at a faster speed than the

Reference numeral 4 denotes a presser conveyor on the discharge side which is provided in series with the presser conveyor 3 and is arranged to rotate at the same speed as the feed net 2 as usual.

Although there are two sets of presser conveyors 3 and 4, there may be more than two sets.

Reference numeral 5 denotes an actuating device which is provided on the holding conveyor 4 on the carry-out side and operates to separate the holding conveyor 4 upwardly from the feed net 2 at regular intervals, or it also operates on the holding conveyor 3 on the carrying-in side. A device 5' is provided to operate both presser conveyors 3, 4 or the discharge side presser conveyor 4 as described above.

For example, when an air cylinder is used, the actuating devices 5, 5' control the electromagnetic valve 7 by a control circuit 6 that incorporates a timing device such as a timer and periodically issues an output signal.
It is activated by turning N and OFF.

For example, one shaft 3', 4' of the presser conveyors 3, 4 is used as a fulcrum, and the actuating device 5, 5' is connected to the other shaft 3//, 4.
1/ and presser conveyors 3 and 4 as shown by dotted line a.
Either pull up both or only 4, or add the upper running part of the chain or spring belt so that the slack on the side that contacts the veneer S is stretched by the weight of the chain or spring belt, as shown by the dotted line in Figure 2. Pressure is also effective.

Alternatively, as shown in the third figure, the actuating devices 5, 5' are provided with an eccentric wheel 9 on a reducer 8 driven by an electric motor, and further connected to the eccentric wheel 9 by a rod 10 and the shafts 3// of the presser conveyors 3, 4. ,4//
This can be done even if the device is connected to

With this idea, since the band-shaped veneer in the veneer dryer shrinks as it dries, the inlet presser conveyor is moved faster than the feed net, and the unloading presser conveyor is set at the same speed as the feed net, so that By raising and lowering all the presser conveyors or the unloading side presser conveyor above the feed net each time, the veneer is released from the feed net and the upper presser conveyor, so it does not receive any frictional force from the presser conveyor. , the veneer can be freely shrunk and dried without breaking.

Even if the presser conveyor is holding the veneer, it is sufficient to at least move the presser conveyor on the unloading side upward and downward at a constant cycle before the veneer breaks due to the contraction force and frictional force of the veneer.

Therefore, when using this invention, there are fewer cracks, so the yield is improved, the quality is good, the repair process after drying is easy, and it is effective for improving production.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating another embodiment of the present invention;
FIG. 3 is an explanatory diagram of another embodiment device. S... Raw veneer, 1... Dryer, 2...
...Feeding net, 3.4... Presser conveyor, 5,5'... Actuation device, 6... Control circuit, 7... Electromagnetic valve.

Claims (1)

[Scope of utility model registration request] At least two or more presser conveyors are provided in the upper part of the feed net in series from the veneer loading side to the veneer loading side, and the feeding speed of the presser conveyor located on the veneer loading side is controlled by the feeding net. In a continuous drying device for veneer veneer, which has a feed speed higher than that of A feeding device for a veneer dryer characterized by being provided with.