FI66313B - BURVALS - Google Patents

Description

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Patents and registries of the United States «lifd ock ucLskrtffe ·» peMcand 29.06.84 (32) (33) (31) fjrjr <«* rm * w -« «« Μ srtoHut 24.04.75 Switzerland-Switzerland (CH) 5257/75 (71 ) Peter Fahrni, Seehaldenstrasse 28, Kilchberg, Switzerland-Switzerland (CH) (72) Walter Wirz, Thalwil, Switzerland-Switzerland (CH) (74) Leitzinger Oy (54) Cage waltz - Burvai s

The invention relates to an apparatus for forming a fluffy web of spreadable components, in particular a chip web for the manufacture of particle boards, which apparatus comprises a movable base for receiving web particles and a particle feeder with cage rollers arranged above it by a transverse rod (11).

One such cage roll has become known, for example, from Swiss patent publication 436 124. The principle of a cage roll has proved to be very good in the distribution of spreadable goods, especially in the field of chipboard manufacturing. This is achieved by a rotating cage roller, the speed of which is adapted to the particular conditions and conditions, usually to apply more or less felted scattering particles and to distribute the material to be scattered over a wide area. However, it has now been found that the wishes set for the cage roller have not been met in certain cases, and in particular when the chippings to be distributed and evenly distributed contain a large proportion of fine material.

2,66313

In fact, there are often irregularities when scattering into a web, the causes of which have not yet been determined. Obviously, a considerable drawback is that the air inside the hollow roll becomes centrifuged outwards due to the centrifugal force, which causes a negative pressure in the roll. The invariance of the pressure thus reduced appears to be disturbed at short intervals due to the unevenness of the particle feed, resulting in uncontrollable oscillations and the particle layer formed under the roll having no flat top surface. This leads to natural! in a plate pressed for differences in tightness and strength.

The object of the present invention is to provide a cage roll which has the complete advantages of a perforated, hollow spreading and distribution roll, but which no longer has considerable disadvantages. The cage roll according to the invention is characterized in that the bars have a flat cross-section and that the longitudinal axis of the cross-section of each bar forms an acute angle with the radius of the roll passing through its center.

The drawing illustrates an application example of the subject of the invention and shows:

Figure 1 is a sectional side view of an apparatus for spreading and sprinkling wood chip particles on a moving substrate by means of a cage roller according to the invention.

Figure 2 shows different cross-sectional shapes of the bars forming the hollow roll shell.

Reference numeral 1 denotes a bottom belt which can be turned by means of a conveyor belt of a transport hopper not otherwise shown in the apparatus for the manufacture of particle board web. Shaft 3 is operated intermittently or continuously at an adjustable speed as required. The belt hopper is closed on the spreading side by nail rollers 4, 5, 6 and 7. These spreading rollers can be used separately or together. By appropriately adjusting the speed of these rollers, a predetermined throwing effect can be obtained and thus the maximum utilization of the cage roller 8 arranged below. The cage roller 8 is basically a hollow roller with, for example, a through-going drive shaft 9f, two lateral end flanges 10 and a plurality of spaced-apart transverse rods 11 parallel to the axis of rotation. In this case, the direction of rotation of the roller indicated by the arrow A is such that at the point where the particles meet the roller, a shoveling effect occurs. Thanks to the formation of the cross bars and in particular the position or fit, the particles flowing towards them are transported quickly and safely inside the roller. In addition, a kind of pumping effect is created, because the outside air is conveyed inside the roll by the wing-like rods 11 as the roller rotates. Without this, the suction counteracts said centrifugal effect, so that the danger mentioned at the beginning can be eliminated. By selecting the speed, number, shape and position of the rods 11, it is possible to achieve an optimal balance between the two opposing effects for the desired effect.

It is further apparent from the drawing that the felted and fluffed particles 12 fall as a fan-shaped curtain onto a through-spreading substrate formed as a web conveyor belt 13. The thus-formed web 14 is transported in the direction of the arrow B, for example, pre-press.

Figure 2 shows other profiles of crossbars as an example. Of course, still other profiles are conceivable, such as very thin, Attachments or curved profiles. The shape of the profile depends largely on the quality of the material to be fluffed and / or distributed.

One previously unmentioned possibility, which expands the range of use of the roller, is to make the cross bars adjustable about its longitudinal axis. This adjustability shown by the arrow C in Fig. 2 preferably also exists when the roller rotates. Thus, a bar connecting reversibly mounted crossbars can be arranged outside the second end flange, which can be adjusted during the rotational movement of the roller 4 6631 3 in a manner known per se on other machines. Another possibility is that the cross bars 11 can be adjusted as the roller rotates individually and not together. For this purpose, a cam track can be arranged next to the hollow roller 8, on which rollers or the like connected to pivotally mounted crossbars rotate or slide, so that each rod rotates relative to the flanges supporting them according to a predetermined program.