FI97113B - Blow chambers - Google Patents

Abstract

Air deposition chamber (9) used in the manufacture of particle boards on a distributing machine, which chamber is delimited at the underside by a particle conveyor belt (3), at the sides by side walls (10), at the ends by end walls (11, 12) and at the upper side by a ceiling. The invention is designed in such a way that the ceiling of the air deposition chamber (9) is formed by the part (14) of a belt conveyor. <IMAGE>

Description

97113

WIND CHAMBER - BLACK CHAMBER

The present invention relates to a wind chamber of a spreading machine for the production of particle board according to the preamble of claim 1.

One of the key stages in the chipboard manufacturing process is the formation of the blank, i.e. the so-called sprinkling, sprinkling is performed on a special-10 for sprinklers. They apply a mixture of chips and binder as a smooth continuous mat to the spreading belt conveyor. A typical sprinkler has a so-called bunker, bottom belt conveyor, leveling rakes, unloading and dismantling equipment and wind chamber.

The present invention therefore relates to a wind chamber which is a space defined below by a spreading conveyor, by side walls, by end walls and above by a roof, in which air is used to transfer the drop to be dropped by the spreading devices. Air is led to the wind chamber from one end wall and removed from the opposite end wall.

The finest chip particles fly farthest in the wind chamber and the coarsest ones move only slightly with the air. This gives the desired structure of ί 2.5 chipboard, in which the surface of the board consists of an almost dusty chip fraction with the average size of the chips: increasing as the board moves towards the center.

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The problem with currently known wind chambers is the adhesion of floating • · «'30 dust to the roof of the wind chamber, from where it drops over time. . to the surface of the chipboard to be sprinkled uncontrollably from time to time • «« * · / eg when the dust layer grows sufficiently or

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* · * 'Due to rumble, etc. Dust piles falling from the ceiling form: * ·.! clearly visible spots on the surface of the board, which will damage the surface, lowering the quality level of the chipboard.

The object of the invention is to provide a wind chamber which does not have the above-mentioned problems. The invention is characterized in that the roof of the wind chamber is formed substantially by the return side of the bottom belt conveyor of the entire spreading hopper.

An embodiment of the invention is characterized in that a scaler is provided in the wind chamber on the return side of the belt conveyor to remove dust adhering to the wind chamber side.

Another embodiment of the invention is characterized in that a screw conveyor is arranged in the chute below the scraper in order to remove the dust 10 removed from the return side of the belt conveyor from the wind chamber.

Since the roof of the wind chamber is a moving belt, the dust adhering to the belt moves with the belt next to the end wall, where the dust 15 is removed from the belt in a controlled manner by a scanner and led out of the wind chamber by a conveyor, for example a screw conveyor. The belt, which is constantly moving, does not have time to adhere to such a large layer of dust that, when detached, it could damage the surface of the chipboard.

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In the following, the invention will be explained in detail by means of preferred embodiments with reference to the accompanying drawings, in which • · «

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& 5 Fig. 1 shows diagrammatically and a side view of a spraying machine with a wind chamber according to the prior art.

::: Figure 2 shows a sprinkler equipped with a wind chamber according to the invention.

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In the manufacture of particle board, spraying is performed on special spraying machines. One prior art sprinkler- I '! IH I M! 11 m i; 3 97 113 lukone is shown in Figure 1. Sirottelukoneella is applied to the bottom of the chip and binder mixture into a mat 2 smoothly continuous to a sirottelukoneen 3, moving in the direction of arrow 4 sirotteluhihnakuljettimelle.

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Sirottelukoneeseen typically comprises a bunker 5, the arrow direction of the movable base 6 of the conveyor belt, the distribution of the conveyor 1, to 7-sausharavat, unloading and dispersion tuulikammio 8 and 9.

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The wind chamber 9 is a space delimited by the spreading belt conveyor 4, the side walls 10, the end walls 11, 12 and the roof 13, where air is conveyed by the chips to be dropped through the spreading devices 8. Air is led to the wind chamber from the end wall 11 as indicated by the arrows 15 and is also removed from the opposite end wall 12 as indicated by the arrows.

The finest chip particles fly farthest in the wind chamber and the coarsest ones move only slightly with the air. This gives a structure typical of 20 chipboards, in which the surface of the board is formed of a nearly dust-like chip fraction, and in which the average size of the chips increases as the center of the board increases.

Thus, in the known wind chamber with a fixed roof 13, shown in Figure 1, the problem is that dust accumulates on the ceiling and occasionally falls uncontrollably:. to the surface of the chipboard to be sprinkled.

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Figure 2 shows a spreading machine with a wind chamber according to the invention. The machine has 9 structures in the wind chamber. . except similar to Fig. 1, so with reference to Fig. 2 • t 1 * '· only the structure of the wind chamber will be explained. In the wind chamber 9 according to the invention, the roof of the chamber is formed by a movable part of the belt conveyor, on which the return side of the sprinkler bottom belt conveyor 6 is preferably used.

Since the roof is a movable belt 14, the dust adhering to the belt moves with the belt next to the end wall 12, where a scaler 15 is placed. In this case, the dust falls into the chute 17, from which it is conveyed away by a screw conveyor 16. The scraper 15, the screw-5 conveyor 16 and the chute 17 preferably extend over the entire width of the belt 14 or at least the width of the chipboard to be formed.

It will be clear to a person skilled in the art that the invention is not limited to the above-mentioned exemplary embodiments, but can be varied within the scope of the appended claims. It was mentioned above that the scaler 15 is attached to the end wall 12, for example. It is essential that these are located close to the end wall 12.

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Claims (3)

97113 A dirt chamber (9) of a spreading machine used for the production of particle board, bounded below by a spreading belt conveyor (4), laterally by side walls (10), at end ends by end walls (11, 12) and above by a roof, characterized in that the wind chamber (9) the roof is formed by substantially the entire side of the spreading hopper (5) by the return side (14) of the polar hunting conveyor (6). 10 Wind chamber according to Claim 1, characterized in that a scraper (15) is provided in the wind chamber on the return side (14) of the belt conveyor to remove dust adhering to the wind chamber (9). 15 Wind chamber according to Claim 2, characterized in that a screw conveyor (16) is arranged in the chute 20 (17) below the scraper in order to remove the dust removed from the return side (14) of the belt conveyor by the scraper (15). • ·. • ·. • · · • · · • ·. • · • · • «· •. · • · V · *» «t · • · • ·. 6 97113 FATENTKRAV