FI71239B - SAOLLNINGSFOERFARANDE OCH -ANORDNING - Google Patents

Description

71239

SCREENING METHOD AND EQUIPMENT - SÄLLNINGSFÖRFARANDE OCH -ANORDNING

The present invention relates to a screening method for the treatment of difficult-to-screen materials, in which a component of the material tends to adhere to the screen surface, such as separating sunflower seeds from other involved inflorescence material. .

Screening is normally based on screen vibration, which causes the material on the surface of the screen to move to cause screening. A prerequisite for successful screening is that the components of the material to be screened do not adhere to the surface of the screen or to each other. If such an attempt at adhesion occurs, screening in the usual way using mere vibration is not possible.

Said adhesion problem has been encountered when harvesting sunflower seeds by the method presented in FI patent application 812221. Ko. in the method, the flower buds are cut with a cutter so that the seeds are cut off from the blade below. However, in practice, the separation is not complete, but the seeds include stalk waste and other inflorescence material, which must be separated from the seeds by screening. When the method makes it possible to repair mycorrhizae when wet, the moisture of the blade waste and other inflorescence material causes the above-mentioned adhesion problem. Thus, screening is not successful with conventional screening methods based on screen shaking.

The object of the present invention is to provide a screening method in which there is no adhesion of the material to be screened and consequent clogging of the screen. The method according to the invention uses a brush roll rotating about its own axis, cleaning the surface of the screen, and is characterized in that the brush roll is located on the side of the screen where the material to be screened is located and that the brush roll and the screen surface are moved relative to each other during rotation. around, whereby the brush roll causes the material to be screened to move in a screening manner and at the same time cleans the screen by removing the material adhering to its surface.

Firstly, the method according to the invention makes it possible to screen materials which are difficult to screen, in addition to which it is achieved that the screen does not necessarily have to be vibrated at all during the screening. Namely, the brush circulates the material to be screened, which is usually sufficient as such to effect screening.

An embodiment of the method according to the invention is characterized in that a horizontal, stationary screen is used in the screening, along the surface of which the bristle roll is moved linearly during the screening. The rotational movement of the brush and the linear movement are then preferably completely independent of each other.

The invention can also be applied to screening with a rotating drum screen. This is most preferably accomplished by rotating the brush roll about its own axis while rotating the drum screen in the opposite direction to the direction of rotation of the brush roll. The displacement of the brush roll relative to the surface of the screen is then based on the rotational movement of the screen, since the roll can remain stationary except for its own rotational movement. In this case, too, the purpose of the brush roller is to keep the screen surface clean and to set in motion the material to be screened.

3,71239

The invention further relates to a screening apparatus for applying a blocked screening method, comprising a screen and a brush roll rotated about its own axis, placed against the screen, which cleans the screen during screening. This apparatus is characterized in that the brush roll is located on the side of the screen where the material to be screened is located and that the brush roll and the screen surface can be moved relative to each other during screening while the brush roll is rotated about its own axis. and at the same time cleans the screen by removing material adhering to its surface.

As described above, the apparatus may comprise a horizontal, stationary screen along the surface of which the brush roll is linearly displaceable during screening, or alternatively a drum screen rotatable in the opposite direction to the direction of rotation of the brush roll during screening.

The invention will now be described in more detail by way of example with reference to the accompanying drawing, in which

Fig. 1 shows a brush roll according to the invention in which the screen remains in place,

Fig. 2 shows a screening according to the invention by means of a brush roller and a rotating drum screen, and

Fig. 3 shows the screening according to Fig. 2 in a section taken along the line III-III in Fig. 2.

The screening according to Figure 1 uses a horizontal, reticulated, stationary screen 1 and a brush roll 3 rotating about its own axis 2 and moving linearly along the screen surface. The screen 4 material 4 71239 on the surface of the screen 1 is a mixture in which a component tends to adhere to the screen surface and plug the gaps in the sieve. The function of the movable brush roll 3 is to prevent such adhesion and to keep the sieve permeable. At the same time, the brush roll 3 moves the material to be screened, as a result of which the component 5 passing through the screen 1 is screened according to the arrows 6 marked in Fig. 1 under the screen, from which it can be taken.

According to Figure 1, the material 4 to be screened may be a mixture of sunflower seeds and other accompanying inflorescence material obtained in connection with the harvesting of auging flower seeds. The component 5 to be screened through the screen 1 is then sunflower seeds, and the other flowering material in the mixture remains on the surface of the screen. This flowering material 11a1la, which is rich in moisture, tends to adhere to the surface of the screen, but due to the cleaning effect of the screen of the moving brush roller 3, clogging of the screen does not occur.

Figures 2 and 3 show an embodiment of the invention in which a drum screen 8 rotating about its axis 7 is used as the screen. A brush roller 3 is mounted against the inner surface of the drum screen 8, which rotates about its own axis 2 but otherwise remains in place. The screening is based on the rotational movements of the drum screen 8 and the brush roll 3 in substantially the same way as in the above-described embodiment of Fig. 1, i.e. the brush roll cleans the screen surface and at the same time moves the screened material 4 relative to the screen surface. under the screen 8 is mounted in the chute 9, which screenable component 5 drops, and a screen 8 in accordance with the arrow 10 the input material to be screened four axial displacement to provide a screen kouruineen installed in accordance with the inclined position of Figure 2. The screened component and the screening waste then leave the screening equipment according to arrows 11 and 12. Alternatively, said axial displacement could be achieved by means of a screw thread formed on the inner surface of the screen 8 or on the roll 3.

It will be apparent to those skilled in the art that the various embodiments of the invention are not limited to the examples presented but may vary within the scope of the appended claims.

Claims (5)

6 71239 A screening method for treating difficult-to-screen materials [4], wherein a component of the material tends to adhere to the surface of the screen (1,0), such as separating sunflower seeds from other accompanying inflorescence material, using a screen positioned around its own axis a rotating brush roll (3) for cleaning the screen during screening, characterized in that the brush roll (3) is located on the side of the screen (1,0) on which the material to be screened (4) is located and that the brush roll and the screen surface are moved to each other during screening while the brush roll is rotated about its own axis, whereby the brush roll causes the material to be screened to move through the screen and at the same time cleans the screen by removing the material adhering to its surface. Screening method according to Claim 1, characterized in that a horizontal, stationary screen (1) is used for screening, along the surface of which the brush roll (3) is moved linearly during screening. Screening method according to Claim 1, characterized in that the screening takes place in a drum region 11a (0) which, during the screening, is rotated in a direction opposite to the direction of rotation of the brush roll (3). Screening apparatus for applying a method according to any one of the preceding claims, comprising a screen (1,0) and a brush roll (3) rotated about its own axis and cleaned by the screen during screening, characterized in that the brush roll (3) is arranged in the screen (1,0) to the side on which the material to be screened (4) is located, and that the brush roll and the surface of the screen can be moved relative to each other during screening while the brush roll is rotated about its own axis, causing the screen roll to move the screened material. material adhering to its surface. 7 71239 Screening apparatus according to Claim 4, characterized in that the apparatus comprises a horizontal, stationary screen (1), along the surface of which the brush roll (3) can be moved linearly during screening. Screening apparatus according to Claim 4, characterized in that the apparatus comprises a drum screen [8) which can be rotated in the opposite direction to the direction of rotation of the brush roller (3) during screening. 8 71239 PATEIMTKRAV