FI110173B - A device for smoothing the variation of the media feed from the tray feeder - Google Patents

Description

j 110173

A device for smoothing the variation of the media feed from the tray feeder

The invention relates to a device for compensating for the periodic variation in the structure and mode of operation of the feed stream 5, which contains wood chips, chips or bark or combinations thereof fed from a tray feeder to an inclined slide.

Such a device can be used, for example, in a device known from Applicant's Finnish Utility Model No. 3899. In this known device, special chips or similar pieces of substantially hexagonal shape having length and width and a substantially smaller thickness, and the wood chips containing the fines particles are pulsed to separate the fines into a single fraction or fraction by thickness. wherein the various chips and fines particles are arranged to be separated from one another by one or more separation walls arranged in accordance with different flight paths provided by impulse effect, the device comprising a feeder for feeding wood chips to a bearing support surface substantially in one layer. / widthwise · · ·· .. * 20 and to dissolve on said length / width surface

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With said inclined support surface over a gap extending across the gap through which the gap is imaged to provide an impulse effect on the chips or fines particles at the gap through a continuous flow of gas. With such a known device, it is intended to distinguish between different fractions based on the thickness of the chips from a large flow rate of wood chips of 25 (size hundreds of cubic meters per hour). At the same time, higher density materials such as scrap ·; · 'as well as undesirable contaminants can also be distinguished. It is important for the proper functioning of the device that the wood chips to be treated are evenly spread on a single supporting layer on the device.

»·» ·: ·: 30 110173 2 US Patent Specification 2214434 discloses a tray feeder for discharging material to fall on a freely inclined plane surface from which it bounces and spreads. Due to free fall and simple baffles, the material flow is not uniformly inclined on a sloping surface.

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With the tray feeder, it is possible to dispense the feed material on the slope with the tray feeder with an average uniform capacity. However, due to the design and operation of the device, there is an instantaneous fluctuation in the material flow from the tray feeder, which occurs as the new tray 10 rotates into the free area above the slide. Of course, the number of trays in the tray feeder is limited and even the largest particle of material to be processed must fit in the tray.

It is an object of the invention to eliminate or at least reduce this drawback and to provide a device which allows the material to be treated to be as smooth as possible on the sliding surface and in such a way that the material particles do not overlap on the sliding plane.

·. : This task is solved according to the invention and the device according to the invention is characterized in that a plurality of disadvantages affecting the flow of material from above, below or on both sides are arranged to influence the flow of material from the tray feeder to the slide. - »· The major disadvantages consist of a plurality of slanting protrusions, which are spaced apart: spaced apart by the slider width, which distribute 25 streams of material extending in the width direction of the sliding material, with and without the above-mentioned damage; forms a flexibly flowing flap disposed above the flow of material from the tray feeder.

*:: 30 In a preferred embodiment of the invention, it is arranged that the disadvantage is formed by a baffle plate adapted to be inclined. Preferably, the baffle is formed by a longitudinally extending, flip-flop plate. The baffle distributes the material stream in the sliding width direction.

In a preferred embodiment of the invention, it is arranged that the shark forms a resiliently flowing flap disposed above the flow of material sliding from the tray feeder.

The flap is preferably dimensioned to limit the passage of peaks in the material stream by cutting the peaks. Preferably, the flap is formed by a rubber bead extending over a width of 10 slides.

The invention will now be described in more detail with reference to the accompanying drawings, in which: Figure 1 is a schematic sectional view of a tray feeder arranged in a device in which wood chips are divided into different fractions.

Figure 2 shows the tray feeder of Figure 1 on a larger scale. and equipped with a device according to the invention.

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Fig. 1 schematically shows an apparatus for dividing wood chips 1 into different fractions. The fines particles 13 possibly present in the wood chips 1 are separated into their own fraction and the chips pieces 11,12 according to their thickness into over-thick chips pieces 11 (reject) and approved chips pieces 12 (accept).

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The apparatus includes a feeding device 6 for feeding the wood chips 1 to the inclined support surface 2 in substantially one layer. The individual pieces of chips 11,12 are: naturally supported on their largest surface, in the case of chips, their length / le '';

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The supporting surface 2 is a rigid, flat and abrasion-resistant planar surface that forms a steeply sloping sliding surface for the subdivided wood chips 1.

The wood chips 1 from the feeder 6 are arranged to slide first on the supporting surface 2 and then across the support surface 3 through the support surface 2, where the gap is arranged to be applied to one or more chips 11,12 or fines particle 13 4. The impulse effect is arranged to be provided by the gas flow 4, preferably by the air flow. The direction of the Im-10 pulse effect 4 may be perpendicular to the support surface 2 or also at an oblique angle to the support surface 2.

The air flow is produced by the fan 7. A nozzle chamber 8 is provided between the fan 7 and the slot 3 to ensure uniform impulse action 4.

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Chips of different thicknesses 11,12 and possible fines 13 are arranged to be separated from each other according to the different paths provided by the impulse effect 4 to the particles to be divided.

The fines particles 13, which are smaller than the width of the gap 3, receive. “': Maximum speed change, whereby they are arranged to be controlled by the control / oh ·; the effect of the sensing plate 14 as its own fraction in the trough 15.

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The chips 11, 12, which are considerably larger in size than the width of the gap 3 and thus heavier than the said fines 13, exhibit a substantially smaller velocity change at the fin 3 compared to the fines 13. The impulse given by the pressure flies the chips 11,12 to different trajectories according to the oxygen thickness and the applicants are divided into different fractions by a separation wall 5 '; · '. On average, the thinnest chips 12 fly over the separation wall 5 and 30 are further guided to the unloading screw 10. Similarly, the average thicker chips 110173 5 fly a shorter distance and fall into the feeder 6 'between the separation wall 5 and the slot 3.

The average thickest chips 11 entering the feeder 6 'are reprocessed in the second device below in the example of the drawing 5, whereby some of them (the lightest part) pass over the separating wall 5' to the unloading screw 10 and part (the heaviest part) falls into the separating wall 5 ' in the trough provided with the discharge screw 9.

The treatment of wood chips 1 is arranged in its entirety to take place in a dust-tight treatment chamber 17. The air is removed from the chamber 17 by reference numeral 34 meaning through the opening.

Figure 2 shows a detail of a feeder 6 applied to the device of Figure 1, in particular a tray feeder. It will be understood, however, that the present tray feeder 6 is not intended solely for use in the device shown in Figure 1, but may also be used elsewhere.

·. : With Tray Feeder 6, it is possible to feed the Tray 2 Slide 2 feed material with average uniform capacity. Device. “*: However, due to its structure and mode of operation, there is a momentary variation in the material flow 1 from the tray feeder 6.

To eliminate this drawback, a plurality of disadvantages 15,16 arranged to influence the flow of material 25 from the tray feeder 6 are arranged to affect the flow of material 25, as best shown in Figure 2.

In the embodiment of Figure 2, the disadvantage 15 is formed by a baffle fitted to the sliding plane 2; The baffle plate 15 is preferably formed by a plate extending in the longitudinal direction 30 of the material stream 1, projecting from the slide 2 and increasing in height in the direction of motion of the material stream 1. The barrier 15 may also be formed, for example, by a pin 6 110173 extending from the slider 2. The barrier 15 is preferably spaced evenly over the entire width of the slider 2.

A disadvantage may also be provided above the material flow 1, but in that case it must be resiliently flexible. In Figure 2, such a drawback is denoted by reference numeral 16 and is formed by a rubber bead extending over the width of the slide 2, which is dimensioned to limit the passage of the peaks in the material stream 1 by cutting the peaks.

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Claims (5)

7, 110173 Apparatus for compensating for a periodic variation in the structure and mode of operation of the tray (6) fed from the tray feeder (6) to the inclined slide (2), comprising a chip stream (11, 12), a chip (13) or a bark or combinations thereof, , that a plurality of disadvantages (15,16) acting on the upper or lower side or on both sides of the material stream (1) are arranged to act on the path of the material stream (1) discharging from the tray feeder (6) to the slider (2); projections protruding from the inclined slide (2) spaced apart from one another to the width of the slide (2), which propagate a flow of material advancing on the slide (2) in the width direction of the slide (2), (6) flow of material (1) discharged to slide (2) gen the so-15-matched yielding a flexible flap. Device according to Claim 1, characterized in that the deflection is formed by a longitudinal direction of the material stream (1), which protrudes from the sliding plane (2). 20 Device according to claim 2, characterized in that the height of the baffle plate (15) / ·: increases in the direction of movement of the material flow (1). Device according to Claim 1, characterized in that the flap (16) is dimensioned in such a way as to limit the passage of the peaks in the material stream (1) by cutting the peaks. Device according to Claim 1, characterized in that the flap (16) is formed by a rubber bead extending across the width of the slide (2). Patentkrav 110173